| 1 | /* ELF linking support for BFD. |
| 2 | Copyright (C) 1995-2019 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of BFD, the Binary File Descriptor library. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 19 | MA 02110-1301, USA. */ |
| 20 | |
| 21 | #include "sysdep.h" |
| 22 | #include "bfd.h" |
| 23 | #include "bfdlink.h" |
| 24 | #include "libbfd.h" |
| 25 | #define ARCH_SIZE 0 |
| 26 | #include "elf-bfd.h" |
| 27 | #include "safe-ctype.h" |
| 28 | #include "libiberty.h" |
| 29 | #include "objalloc.h" |
| 30 | #if BFD_SUPPORTS_PLUGINS |
| 31 | #include "plugin-api.h" |
| 32 | #include "plugin.h" |
| 33 | #endif |
| 34 | |
| 35 | /* This struct is used to pass information to routines called via |
| 36 | elf_link_hash_traverse which must return failure. */ |
| 37 | |
| 38 | struct elf_info_failed |
| 39 | { |
| 40 | struct bfd_link_info *info; |
| 41 | bfd_boolean failed; |
| 42 | }; |
| 43 | |
| 44 | /* This structure is used to pass information to |
| 45 | _bfd_elf_link_find_version_dependencies. */ |
| 46 | |
| 47 | struct elf_find_verdep_info |
| 48 | { |
| 49 | /* General link information. */ |
| 50 | struct bfd_link_info *info; |
| 51 | /* The number of dependencies. */ |
| 52 | unsigned int vers; |
| 53 | /* Whether we had a failure. */ |
| 54 | bfd_boolean failed; |
| 55 | }; |
| 56 | |
| 57 | static bfd_boolean _bfd_elf_fix_symbol_flags |
| 58 | (struct elf_link_hash_entry *, struct elf_info_failed *); |
| 59 | |
| 60 | asection * |
| 61 | _bfd_elf_section_for_symbol (struct elf_reloc_cookie *cookie, |
| 62 | unsigned long r_symndx, |
| 63 | bfd_boolean discard) |
| 64 | { |
| 65 | if (r_symndx >= cookie->locsymcount |
| 66 | || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL) |
| 67 | { |
| 68 | struct elf_link_hash_entry *h; |
| 69 | |
| 70 | h = cookie->sym_hashes[r_symndx - cookie->extsymoff]; |
| 71 | |
| 72 | while (h->root.type == bfd_link_hash_indirect |
| 73 | || h->root.type == bfd_link_hash_warning) |
| 74 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 75 | |
| 76 | if ((h->root.type == bfd_link_hash_defined |
| 77 | || h->root.type == bfd_link_hash_defweak) |
| 78 | && discarded_section (h->root.u.def.section)) |
| 79 | return h->root.u.def.section; |
| 80 | else |
| 81 | return NULL; |
| 82 | } |
| 83 | else |
| 84 | { |
| 85 | /* It's not a relocation against a global symbol, |
| 86 | but it could be a relocation against a local |
| 87 | symbol for a discarded section. */ |
| 88 | asection *isec; |
| 89 | Elf_Internal_Sym *isym; |
| 90 | |
| 91 | /* Need to: get the symbol; get the section. */ |
| 92 | isym = &cookie->locsyms[r_symndx]; |
| 93 | isec = bfd_section_from_elf_index (cookie->abfd, isym->st_shndx); |
| 94 | if (isec != NULL |
| 95 | && discard ? discarded_section (isec) : 1) |
| 96 | return isec; |
| 97 | } |
| 98 | return NULL; |
| 99 | } |
| 100 | |
| 101 | /* Define a symbol in a dynamic linkage section. */ |
| 102 | |
| 103 | struct elf_link_hash_entry * |
| 104 | _bfd_elf_define_linkage_sym (bfd *abfd, |
| 105 | struct bfd_link_info *info, |
| 106 | asection *sec, |
| 107 | const char *name) |
| 108 | { |
| 109 | struct elf_link_hash_entry *h; |
| 110 | struct bfd_link_hash_entry *bh; |
| 111 | const struct elf_backend_data *bed; |
| 112 | |
| 113 | h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE); |
| 114 | if (h != NULL) |
| 115 | { |
| 116 | /* Zap symbol defined in an as-needed lib that wasn't linked. |
| 117 | This is a symptom of a larger problem: Absolute symbols |
| 118 | defined in shared libraries can't be overridden, because we |
| 119 | lose the link to the bfd which is via the symbol section. */ |
| 120 | h->root.type = bfd_link_hash_new; |
| 121 | bh = &h->root; |
| 122 | } |
| 123 | else |
| 124 | bh = NULL; |
| 125 | |
| 126 | bed = get_elf_backend_data (abfd); |
| 127 | if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL, |
| 128 | sec, 0, NULL, FALSE, bed->collect, |
| 129 | &bh)) |
| 130 | return NULL; |
| 131 | h = (struct elf_link_hash_entry *) bh; |
| 132 | BFD_ASSERT (h != NULL); |
| 133 | h->def_regular = 1; |
| 134 | h->non_elf = 0; |
| 135 | h->root.linker_def = 1; |
| 136 | h->type = STT_OBJECT; |
| 137 | if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL) |
| 138 | h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN; |
| 139 | |
| 140 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 141 | return h; |
| 142 | } |
| 143 | |
| 144 | bfd_boolean |
| 145 | _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info) |
| 146 | { |
| 147 | flagword flags; |
| 148 | asection *s; |
| 149 | struct elf_link_hash_entry *h; |
| 150 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 151 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 152 | |
| 153 | /* This function may be called more than once. */ |
| 154 | if (htab->sgot != NULL) |
| 155 | return TRUE; |
| 156 | |
| 157 | flags = bed->dynamic_sec_flags; |
| 158 | |
| 159 | s = bfd_make_section_anyway_with_flags (abfd, |
| 160 | (bed->rela_plts_and_copies_p |
| 161 | ? ".rela.got" : ".rel.got"), |
| 162 | (bed->dynamic_sec_flags |
| 163 | | SEC_READONLY)); |
| 164 | if (s == NULL |
| 165 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 166 | return FALSE; |
| 167 | htab->srelgot = s; |
| 168 | |
| 169 | s = bfd_make_section_anyway_with_flags (abfd, ".got", flags); |
| 170 | if (s == NULL |
| 171 | || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 172 | return FALSE; |
| 173 | htab->sgot = s; |
| 174 | |
| 175 | if (bed->want_got_plt) |
| 176 | { |
| 177 | s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags); |
| 178 | if (s == NULL |
| 179 | || !bfd_set_section_alignment (abfd, s, |
| 180 | bed->s->log_file_align)) |
| 181 | return FALSE; |
| 182 | htab->sgotplt = s; |
| 183 | } |
| 184 | |
| 185 | /* The first bit of the global offset table is the header. */ |
| 186 | s->size += bed->got_header_size; |
| 187 | |
| 188 | if (bed->want_got_sym) |
| 189 | { |
| 190 | /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got |
| 191 | (or .got.plt) section. We don't do this in the linker script |
| 192 | because we don't want to define the symbol if we are not creating |
| 193 | a global offset table. */ |
| 194 | h = _bfd_elf_define_linkage_sym (abfd, info, s, |
| 195 | "_GLOBAL_OFFSET_TABLE_"); |
| 196 | elf_hash_table (info)->hgot = h; |
| 197 | if (h == NULL) |
| 198 | return FALSE; |
| 199 | } |
| 200 | |
| 201 | return TRUE; |
| 202 | } |
| 203 | \f |
| 204 | /* Create a strtab to hold the dynamic symbol names. */ |
| 205 | static bfd_boolean |
| 206 | _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info) |
| 207 | { |
| 208 | struct elf_link_hash_table *hash_table; |
| 209 | |
| 210 | hash_table = elf_hash_table (info); |
| 211 | if (hash_table->dynobj == NULL) |
| 212 | { |
| 213 | /* We may not set dynobj, an input file holding linker created |
| 214 | dynamic sections to abfd, which may be a dynamic object with |
| 215 | its own dynamic sections. We need to find a normal input file |
| 216 | to hold linker created sections if possible. */ |
| 217 | if ((abfd->flags & (DYNAMIC | BFD_PLUGIN)) != 0) |
| 218 | { |
| 219 | bfd *ibfd; |
| 220 | asection *s; |
| 221 | for (ibfd = info->input_bfds; ibfd; ibfd = ibfd->link.next) |
| 222 | if ((ibfd->flags |
| 223 | & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0 |
| 224 | && bfd_get_flavour (ibfd) == bfd_target_elf_flavour |
| 225 | && elf_object_id (ibfd) == elf_hash_table_id (hash_table) |
| 226 | && !((s = ibfd->sections) != NULL |
| 227 | && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)) |
| 228 | { |
| 229 | abfd = ibfd; |
| 230 | break; |
| 231 | } |
| 232 | } |
| 233 | hash_table->dynobj = abfd; |
| 234 | } |
| 235 | |
| 236 | if (hash_table->dynstr == NULL) |
| 237 | { |
| 238 | hash_table->dynstr = _bfd_elf_strtab_init (); |
| 239 | if (hash_table->dynstr == NULL) |
| 240 | return FALSE; |
| 241 | } |
| 242 | return TRUE; |
| 243 | } |
| 244 | |
| 245 | /* Create some sections which will be filled in with dynamic linking |
| 246 | information. ABFD is an input file which requires dynamic sections |
| 247 | to be created. The dynamic sections take up virtual memory space |
| 248 | when the final executable is run, so we need to create them before |
| 249 | addresses are assigned to the output sections. We work out the |
| 250 | actual contents and size of these sections later. */ |
| 251 | |
| 252 | bfd_boolean |
| 253 | _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) |
| 254 | { |
| 255 | flagword flags; |
| 256 | asection *s; |
| 257 | const struct elf_backend_data *bed; |
| 258 | struct elf_link_hash_entry *h; |
| 259 | |
| 260 | if (! is_elf_hash_table (info->hash)) |
| 261 | return FALSE; |
| 262 | |
| 263 | if (elf_hash_table (info)->dynamic_sections_created) |
| 264 | return TRUE; |
| 265 | |
| 266 | if (!_bfd_elf_link_create_dynstrtab (abfd, info)) |
| 267 | return FALSE; |
| 268 | |
| 269 | abfd = elf_hash_table (info)->dynobj; |
| 270 | bed = get_elf_backend_data (abfd); |
| 271 | |
| 272 | flags = bed->dynamic_sec_flags; |
| 273 | |
| 274 | /* A dynamically linked executable has a .interp section, but a |
| 275 | shared library does not. */ |
| 276 | if (bfd_link_executable (info) && !info->nointerp) |
| 277 | { |
| 278 | s = bfd_make_section_anyway_with_flags (abfd, ".interp", |
| 279 | flags | SEC_READONLY); |
| 280 | if (s == NULL) |
| 281 | return FALSE; |
| 282 | } |
| 283 | |
| 284 | /* Create sections to hold version informations. These are removed |
| 285 | if they are not needed. */ |
| 286 | s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_d", |
| 287 | flags | SEC_READONLY); |
| 288 | if (s == NULL |
| 289 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 290 | return FALSE; |
| 291 | |
| 292 | s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version", |
| 293 | flags | SEC_READONLY); |
| 294 | if (s == NULL |
| 295 | || ! bfd_set_section_alignment (abfd, s, 1)) |
| 296 | return FALSE; |
| 297 | |
| 298 | s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_r", |
| 299 | flags | SEC_READONLY); |
| 300 | if (s == NULL |
| 301 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 302 | return FALSE; |
| 303 | |
| 304 | s = bfd_make_section_anyway_with_flags (abfd, ".dynsym", |
| 305 | flags | SEC_READONLY); |
| 306 | if (s == NULL |
| 307 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 308 | return FALSE; |
| 309 | elf_hash_table (info)->dynsym = s; |
| 310 | |
| 311 | s = bfd_make_section_anyway_with_flags (abfd, ".dynstr", |
| 312 | flags | SEC_READONLY); |
| 313 | if (s == NULL) |
| 314 | return FALSE; |
| 315 | |
| 316 | s = bfd_make_section_anyway_with_flags (abfd, ".dynamic", flags); |
| 317 | if (s == NULL |
| 318 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 319 | return FALSE; |
| 320 | |
| 321 | /* The special symbol _DYNAMIC is always set to the start of the |
| 322 | .dynamic section. We could set _DYNAMIC in a linker script, but we |
| 323 | only want to define it if we are, in fact, creating a .dynamic |
| 324 | section. We don't want to define it if there is no .dynamic |
| 325 | section, since on some ELF platforms the start up code examines it |
| 326 | to decide how to initialize the process. */ |
| 327 | h = _bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC"); |
| 328 | elf_hash_table (info)->hdynamic = h; |
| 329 | if (h == NULL) |
| 330 | return FALSE; |
| 331 | |
| 332 | if (info->emit_hash) |
| 333 | { |
| 334 | s = bfd_make_section_anyway_with_flags (abfd, ".hash", |
| 335 | flags | SEC_READONLY); |
| 336 | if (s == NULL |
| 337 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 338 | return FALSE; |
| 339 | elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry; |
| 340 | } |
| 341 | |
| 342 | if (info->emit_gnu_hash && bed->record_xhash_symbol == NULL) |
| 343 | { |
| 344 | s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash", |
| 345 | flags | SEC_READONLY); |
| 346 | if (s == NULL |
| 347 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 348 | return FALSE; |
| 349 | /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section: |
| 350 | 4 32-bit words followed by variable count of 64-bit words, then |
| 351 | variable count of 32-bit words. */ |
| 352 | if (bed->s->arch_size == 64) |
| 353 | elf_section_data (s)->this_hdr.sh_entsize = 0; |
| 354 | else |
| 355 | elf_section_data (s)->this_hdr.sh_entsize = 4; |
| 356 | } |
| 357 | |
| 358 | /* Let the backend create the rest of the sections. This lets the |
| 359 | backend set the right flags. The backend will normally create |
| 360 | the .got and .plt sections. */ |
| 361 | if (bed->elf_backend_create_dynamic_sections == NULL |
| 362 | || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info)) |
| 363 | return FALSE; |
| 364 | |
| 365 | elf_hash_table (info)->dynamic_sections_created = TRUE; |
| 366 | |
| 367 | return TRUE; |
| 368 | } |
| 369 | |
| 370 | /* Create dynamic sections when linking against a dynamic object. */ |
| 371 | |
| 372 | bfd_boolean |
| 373 | _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) |
| 374 | { |
| 375 | flagword flags, pltflags; |
| 376 | struct elf_link_hash_entry *h; |
| 377 | asection *s; |
| 378 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 379 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 380 | |
| 381 | /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and |
| 382 | .rel[a].bss sections. */ |
| 383 | flags = bed->dynamic_sec_flags; |
| 384 | |
| 385 | pltflags = flags; |
| 386 | if (bed->plt_not_loaded) |
| 387 | /* We do not clear SEC_ALLOC here because we still want the OS to |
| 388 | allocate space for the section; it's just that there's nothing |
| 389 | to read in from the object file. */ |
| 390 | pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS); |
| 391 | else |
| 392 | pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD; |
| 393 | if (bed->plt_readonly) |
| 394 | pltflags |= SEC_READONLY; |
| 395 | |
| 396 | s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags); |
| 397 | if (s == NULL |
| 398 | || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) |
| 399 | return FALSE; |
| 400 | htab->splt = s; |
| 401 | |
| 402 | /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the |
| 403 | .plt section. */ |
| 404 | if (bed->want_plt_sym) |
| 405 | { |
| 406 | h = _bfd_elf_define_linkage_sym (abfd, info, s, |
| 407 | "_PROCEDURE_LINKAGE_TABLE_"); |
| 408 | elf_hash_table (info)->hplt = h; |
| 409 | if (h == NULL) |
| 410 | return FALSE; |
| 411 | } |
| 412 | |
| 413 | s = bfd_make_section_anyway_with_flags (abfd, |
| 414 | (bed->rela_plts_and_copies_p |
| 415 | ? ".rela.plt" : ".rel.plt"), |
| 416 | flags | SEC_READONLY); |
| 417 | if (s == NULL |
| 418 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 419 | return FALSE; |
| 420 | htab->srelplt = s; |
| 421 | |
| 422 | if (! _bfd_elf_create_got_section (abfd, info)) |
| 423 | return FALSE; |
| 424 | |
| 425 | if (bed->want_dynbss) |
| 426 | { |
| 427 | /* The .dynbss section is a place to put symbols which are defined |
| 428 | by dynamic objects, are referenced by regular objects, and are |
| 429 | not functions. We must allocate space for them in the process |
| 430 | image and use a R_*_COPY reloc to tell the dynamic linker to |
| 431 | initialize them at run time. The linker script puts the .dynbss |
| 432 | section into the .bss section of the final image. */ |
| 433 | s = bfd_make_section_anyway_with_flags (abfd, ".dynbss", |
| 434 | SEC_ALLOC | SEC_LINKER_CREATED); |
| 435 | if (s == NULL) |
| 436 | return FALSE; |
| 437 | htab->sdynbss = s; |
| 438 | |
| 439 | if (bed->want_dynrelro) |
| 440 | { |
| 441 | /* Similarly, but for symbols that were originally in read-only |
| 442 | sections. This section doesn't really need to have contents, |
| 443 | but make it like other .data.rel.ro sections. */ |
| 444 | s = bfd_make_section_anyway_with_flags (abfd, ".data.rel.ro", |
| 445 | flags); |
| 446 | if (s == NULL) |
| 447 | return FALSE; |
| 448 | htab->sdynrelro = s; |
| 449 | } |
| 450 | |
| 451 | /* The .rel[a].bss section holds copy relocs. This section is not |
| 452 | normally needed. We need to create it here, though, so that the |
| 453 | linker will map it to an output section. We can't just create it |
| 454 | only if we need it, because we will not know whether we need it |
| 455 | until we have seen all the input files, and the first time the |
| 456 | main linker code calls BFD after examining all the input files |
| 457 | (size_dynamic_sections) the input sections have already been |
| 458 | mapped to the output sections. If the section turns out not to |
| 459 | be needed, we can discard it later. We will never need this |
| 460 | section when generating a shared object, since they do not use |
| 461 | copy relocs. */ |
| 462 | if (bfd_link_executable (info)) |
| 463 | { |
| 464 | s = bfd_make_section_anyway_with_flags (abfd, |
| 465 | (bed->rela_plts_and_copies_p |
| 466 | ? ".rela.bss" : ".rel.bss"), |
| 467 | flags | SEC_READONLY); |
| 468 | if (s == NULL |
| 469 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 470 | return FALSE; |
| 471 | htab->srelbss = s; |
| 472 | |
| 473 | if (bed->want_dynrelro) |
| 474 | { |
| 475 | s = (bfd_make_section_anyway_with_flags |
| 476 | (abfd, (bed->rela_plts_and_copies_p |
| 477 | ? ".rela.data.rel.ro" : ".rel.data.rel.ro"), |
| 478 | flags | SEC_READONLY)); |
| 479 | if (s == NULL |
| 480 | || ! bfd_set_section_alignment (abfd, s, |
| 481 | bed->s->log_file_align)) |
| 482 | return FALSE; |
| 483 | htab->sreldynrelro = s; |
| 484 | } |
| 485 | } |
| 486 | } |
| 487 | |
| 488 | return TRUE; |
| 489 | } |
| 490 | \f |
| 491 | /* Record a new dynamic symbol. We record the dynamic symbols as we |
| 492 | read the input files, since we need to have a list of all of them |
| 493 | before we can determine the final sizes of the output sections. |
| 494 | Note that we may actually call this function even though we are not |
| 495 | going to output any dynamic symbols; in some cases we know that a |
| 496 | symbol should be in the dynamic symbol table, but only if there is |
| 497 | one. */ |
| 498 | |
| 499 | bfd_boolean |
| 500 | bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info, |
| 501 | struct elf_link_hash_entry *h) |
| 502 | { |
| 503 | if (h->dynindx == -1) |
| 504 | { |
| 505 | struct elf_strtab_hash *dynstr; |
| 506 | char *p; |
| 507 | const char *name; |
| 508 | size_t indx; |
| 509 | |
| 510 | /* XXX: The ABI draft says the linker must turn hidden and |
| 511 | internal symbols into STB_LOCAL symbols when producing the |
| 512 | DSO. However, if ld.so honors st_other in the dynamic table, |
| 513 | this would not be necessary. */ |
| 514 | switch (ELF_ST_VISIBILITY (h->other)) |
| 515 | { |
| 516 | case STV_INTERNAL: |
| 517 | case STV_HIDDEN: |
| 518 | if (h->root.type != bfd_link_hash_undefined |
| 519 | && h->root.type != bfd_link_hash_undefweak) |
| 520 | { |
| 521 | h->forced_local = 1; |
| 522 | if (!elf_hash_table (info)->is_relocatable_executable) |
| 523 | return TRUE; |
| 524 | } |
| 525 | |
| 526 | default: |
| 527 | break; |
| 528 | } |
| 529 | |
| 530 | h->dynindx = elf_hash_table (info)->dynsymcount; |
| 531 | ++elf_hash_table (info)->dynsymcount; |
| 532 | |
| 533 | dynstr = elf_hash_table (info)->dynstr; |
| 534 | if (dynstr == NULL) |
| 535 | { |
| 536 | /* Create a strtab to hold the dynamic symbol names. */ |
| 537 | elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init (); |
| 538 | if (dynstr == NULL) |
| 539 | return FALSE; |
| 540 | } |
| 541 | |
| 542 | /* We don't put any version information in the dynamic string |
| 543 | table. */ |
| 544 | name = h->root.root.string; |
| 545 | p = strchr (name, ELF_VER_CHR); |
| 546 | if (p != NULL) |
| 547 | /* We know that the p points into writable memory. In fact, |
| 548 | there are only a few symbols that have read-only names, being |
| 549 | those like _GLOBAL_OFFSET_TABLE_ that are created specially |
| 550 | by the backends. Most symbols will have names pointing into |
| 551 | an ELF string table read from a file, or to objalloc memory. */ |
| 552 | *p = 0; |
| 553 | |
| 554 | indx = _bfd_elf_strtab_add (dynstr, name, p != NULL); |
| 555 | |
| 556 | if (p != NULL) |
| 557 | *p = ELF_VER_CHR; |
| 558 | |
| 559 | if (indx == (size_t) -1) |
| 560 | return FALSE; |
| 561 | h->dynstr_index = indx; |
| 562 | } |
| 563 | |
| 564 | return TRUE; |
| 565 | } |
| 566 | \f |
| 567 | /* Mark a symbol dynamic. */ |
| 568 | |
| 569 | static void |
| 570 | bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info, |
| 571 | struct elf_link_hash_entry *h, |
| 572 | Elf_Internal_Sym *sym) |
| 573 | { |
| 574 | struct bfd_elf_dynamic_list *d = info->dynamic_list; |
| 575 | |
| 576 | /* It may be called more than once on the same H. */ |
| 577 | if(h->dynamic || bfd_link_relocatable (info)) |
| 578 | return; |
| 579 | |
| 580 | if ((info->dynamic_data |
| 581 | && (h->type == STT_OBJECT |
| 582 | || h->type == STT_COMMON |
| 583 | || (sym != NULL |
| 584 | && (ELF_ST_TYPE (sym->st_info) == STT_OBJECT |
| 585 | || ELF_ST_TYPE (sym->st_info) == STT_COMMON)))) |
| 586 | || (d != NULL |
| 587 | && h->non_elf |
| 588 | && (*d->match) (&d->head, NULL, h->root.root.string))) |
| 589 | { |
| 590 | h->dynamic = 1; |
| 591 | /* NB: If a symbol is made dynamic by --dynamic-list, it has |
| 592 | non-IR reference. */ |
| 593 | h->root.non_ir_ref_dynamic = 1; |
| 594 | } |
| 595 | } |
| 596 | |
| 597 | /* Record an assignment to a symbol made by a linker script. We need |
| 598 | this in case some dynamic object refers to this symbol. */ |
| 599 | |
| 600 | bfd_boolean |
| 601 | bfd_elf_record_link_assignment (bfd *output_bfd, |
| 602 | struct bfd_link_info *info, |
| 603 | const char *name, |
| 604 | bfd_boolean provide, |
| 605 | bfd_boolean hidden) |
| 606 | { |
| 607 | struct elf_link_hash_entry *h, *hv; |
| 608 | struct elf_link_hash_table *htab; |
| 609 | const struct elf_backend_data *bed; |
| 610 | |
| 611 | if (!is_elf_hash_table (info->hash)) |
| 612 | return TRUE; |
| 613 | |
| 614 | htab = elf_hash_table (info); |
| 615 | h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE); |
| 616 | if (h == NULL) |
| 617 | return provide; |
| 618 | |
| 619 | if (h->root.type == bfd_link_hash_warning) |
| 620 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 621 | |
| 622 | if (h->versioned == unknown) |
| 623 | { |
| 624 | /* Set versioned if symbol version is unknown. */ |
| 625 | char *version = strrchr (name, ELF_VER_CHR); |
| 626 | if (version) |
| 627 | { |
| 628 | if (version > name && version[-1] != ELF_VER_CHR) |
| 629 | h->versioned = versioned_hidden; |
| 630 | else |
| 631 | h->versioned = versioned; |
| 632 | } |
| 633 | } |
| 634 | |
| 635 | /* Symbols defined in a linker script but not referenced anywhere |
| 636 | else will have non_elf set. */ |
| 637 | if (h->non_elf) |
| 638 | { |
| 639 | bfd_elf_link_mark_dynamic_symbol (info, h, NULL); |
| 640 | h->non_elf = 0; |
| 641 | } |
| 642 | |
| 643 | switch (h->root.type) |
| 644 | { |
| 645 | case bfd_link_hash_defined: |
| 646 | case bfd_link_hash_defweak: |
| 647 | case bfd_link_hash_common: |
| 648 | break; |
| 649 | case bfd_link_hash_undefweak: |
| 650 | case bfd_link_hash_undefined: |
| 651 | /* Since we're defining the symbol, don't let it seem to have not |
| 652 | been defined. record_dynamic_symbol and size_dynamic_sections |
| 653 | may depend on this. */ |
| 654 | h->root.type = bfd_link_hash_new; |
| 655 | if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root) |
| 656 | bfd_link_repair_undef_list (&htab->root); |
| 657 | break; |
| 658 | case bfd_link_hash_new: |
| 659 | break; |
| 660 | case bfd_link_hash_indirect: |
| 661 | /* We had a versioned symbol in a dynamic library. We make the |
| 662 | the versioned symbol point to this one. */ |
| 663 | bed = get_elf_backend_data (output_bfd); |
| 664 | hv = h; |
| 665 | while (hv->root.type == bfd_link_hash_indirect |
| 666 | || hv->root.type == bfd_link_hash_warning) |
| 667 | hv = (struct elf_link_hash_entry *) hv->root.u.i.link; |
| 668 | /* We don't need to update h->root.u since linker will set them |
| 669 | later. */ |
| 670 | h->root.type = bfd_link_hash_undefined; |
| 671 | hv->root.type = bfd_link_hash_indirect; |
| 672 | hv->root.u.i.link = (struct bfd_link_hash_entry *) h; |
| 673 | (*bed->elf_backend_copy_indirect_symbol) (info, h, hv); |
| 674 | break; |
| 675 | default: |
| 676 | BFD_FAIL (); |
| 677 | return FALSE; |
| 678 | } |
| 679 | |
| 680 | /* If this symbol is being provided by the linker script, and it is |
| 681 | currently defined by a dynamic object, but not by a regular |
| 682 | object, then mark it as undefined so that the generic linker will |
| 683 | force the correct value. */ |
| 684 | if (provide |
| 685 | && h->def_dynamic |
| 686 | && !h->def_regular) |
| 687 | h->root.type = bfd_link_hash_undefined; |
| 688 | |
| 689 | /* If this symbol is currently defined by a dynamic object, but not |
| 690 | by a regular object, then clear out any version information because |
| 691 | the symbol will not be associated with the dynamic object any |
| 692 | more. */ |
| 693 | if (h->def_dynamic && !h->def_regular) |
| 694 | h->verinfo.verdef = NULL; |
| 695 | |
| 696 | /* Make sure this symbol is not garbage collected. */ |
| 697 | h->mark = 1; |
| 698 | |
| 699 | h->def_regular = 1; |
| 700 | |
| 701 | if (hidden) |
| 702 | { |
| 703 | bed = get_elf_backend_data (output_bfd); |
| 704 | if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL) |
| 705 | h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN; |
| 706 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 707 | } |
| 708 | |
| 709 | /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects |
| 710 | and executables. */ |
| 711 | if (!bfd_link_relocatable (info) |
| 712 | && h->dynindx != -1 |
| 713 | && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN |
| 714 | || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)) |
| 715 | h->forced_local = 1; |
| 716 | |
| 717 | if ((h->def_dynamic |
| 718 | || h->ref_dynamic |
| 719 | || bfd_link_dll (info) |
| 720 | || elf_hash_table (info)->is_relocatable_executable) |
| 721 | && !h->forced_local |
| 722 | && h->dynindx == -1) |
| 723 | { |
| 724 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 725 | return FALSE; |
| 726 | |
| 727 | /* If this is a weak defined symbol, and we know a corresponding |
| 728 | real symbol from the same dynamic object, make sure the real |
| 729 | symbol is also made into a dynamic symbol. */ |
| 730 | if (h->is_weakalias) |
| 731 | { |
| 732 | struct elf_link_hash_entry *def = weakdef (h); |
| 733 | |
| 734 | if (def->dynindx == -1 |
| 735 | && !bfd_elf_link_record_dynamic_symbol (info, def)) |
| 736 | return FALSE; |
| 737 | } |
| 738 | } |
| 739 | |
| 740 | return TRUE; |
| 741 | } |
| 742 | |
| 743 | /* Record a new local dynamic symbol. Returns 0 on failure, 1 on |
| 744 | success, and 2 on a failure caused by attempting to record a symbol |
| 745 | in a discarded section, eg. a discarded link-once section symbol. */ |
| 746 | |
| 747 | int |
| 748 | bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info, |
| 749 | bfd *input_bfd, |
| 750 | long input_indx) |
| 751 | { |
| 752 | bfd_size_type amt; |
| 753 | struct elf_link_local_dynamic_entry *entry; |
| 754 | struct elf_link_hash_table *eht; |
| 755 | struct elf_strtab_hash *dynstr; |
| 756 | size_t dynstr_index; |
| 757 | char *name; |
| 758 | Elf_External_Sym_Shndx eshndx; |
| 759 | char esym[sizeof (Elf64_External_Sym)]; |
| 760 | |
| 761 | if (! is_elf_hash_table (info->hash)) |
| 762 | return 0; |
| 763 | |
| 764 | /* See if the entry exists already. */ |
| 765 | for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next) |
| 766 | if (entry->input_bfd == input_bfd && entry->input_indx == input_indx) |
| 767 | return 1; |
| 768 | |
| 769 | amt = sizeof (*entry); |
| 770 | entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt); |
| 771 | if (entry == NULL) |
| 772 | return 0; |
| 773 | |
| 774 | /* Go find the symbol, so that we can find it's name. */ |
| 775 | if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr, |
| 776 | 1, input_indx, &entry->isym, esym, &eshndx)) |
| 777 | { |
| 778 | bfd_release (input_bfd, entry); |
| 779 | return 0; |
| 780 | } |
| 781 | |
| 782 | if (entry->isym.st_shndx != SHN_UNDEF |
| 783 | && entry->isym.st_shndx < SHN_LORESERVE) |
| 784 | { |
| 785 | asection *s; |
| 786 | |
| 787 | s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx); |
| 788 | if (s == NULL || bfd_is_abs_section (s->output_section)) |
| 789 | { |
| 790 | /* We can still bfd_release here as nothing has done another |
| 791 | bfd_alloc. We can't do this later in this function. */ |
| 792 | bfd_release (input_bfd, entry); |
| 793 | return 2; |
| 794 | } |
| 795 | } |
| 796 | |
| 797 | name = (bfd_elf_string_from_elf_section |
| 798 | (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link, |
| 799 | entry->isym.st_name)); |
| 800 | |
| 801 | dynstr = elf_hash_table (info)->dynstr; |
| 802 | if (dynstr == NULL) |
| 803 | { |
| 804 | /* Create a strtab to hold the dynamic symbol names. */ |
| 805 | elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init (); |
| 806 | if (dynstr == NULL) |
| 807 | return 0; |
| 808 | } |
| 809 | |
| 810 | dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE); |
| 811 | if (dynstr_index == (size_t) -1) |
| 812 | return 0; |
| 813 | entry->isym.st_name = dynstr_index; |
| 814 | |
| 815 | eht = elf_hash_table (info); |
| 816 | |
| 817 | entry->next = eht->dynlocal; |
| 818 | eht->dynlocal = entry; |
| 819 | entry->input_bfd = input_bfd; |
| 820 | entry->input_indx = input_indx; |
| 821 | eht->dynsymcount++; |
| 822 | |
| 823 | /* Whatever binding the symbol had before, it's now local. */ |
| 824 | entry->isym.st_info |
| 825 | = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info)); |
| 826 | |
| 827 | /* The dynindx will be set at the end of size_dynamic_sections. */ |
| 828 | |
| 829 | return 1; |
| 830 | } |
| 831 | |
| 832 | /* Return the dynindex of a local dynamic symbol. */ |
| 833 | |
| 834 | long |
| 835 | _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info, |
| 836 | bfd *input_bfd, |
| 837 | long input_indx) |
| 838 | { |
| 839 | struct elf_link_local_dynamic_entry *e; |
| 840 | |
| 841 | for (e = elf_hash_table (info)->dynlocal; e ; e = e->next) |
| 842 | if (e->input_bfd == input_bfd && e->input_indx == input_indx) |
| 843 | return e->dynindx; |
| 844 | return -1; |
| 845 | } |
| 846 | |
| 847 | /* This function is used to renumber the dynamic symbols, if some of |
| 848 | them are removed because they are marked as local. This is called |
| 849 | via elf_link_hash_traverse. */ |
| 850 | |
| 851 | static bfd_boolean |
| 852 | elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h, |
| 853 | void *data) |
| 854 | { |
| 855 | size_t *count = (size_t *) data; |
| 856 | |
| 857 | if (h->forced_local) |
| 858 | return TRUE; |
| 859 | |
| 860 | if (h->dynindx != -1) |
| 861 | h->dynindx = ++(*count); |
| 862 | |
| 863 | return TRUE; |
| 864 | } |
| 865 | |
| 866 | |
| 867 | /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with |
| 868 | STB_LOCAL binding. */ |
| 869 | |
| 870 | static bfd_boolean |
| 871 | elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h, |
| 872 | void *data) |
| 873 | { |
| 874 | size_t *count = (size_t *) data; |
| 875 | |
| 876 | if (!h->forced_local) |
| 877 | return TRUE; |
| 878 | |
| 879 | if (h->dynindx != -1) |
| 880 | h->dynindx = ++(*count); |
| 881 | |
| 882 | return TRUE; |
| 883 | } |
| 884 | |
| 885 | /* Return true if the dynamic symbol for a given section should be |
| 886 | omitted when creating a shared library. */ |
| 887 | bfd_boolean |
| 888 | _bfd_elf_omit_section_dynsym_default (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 889 | struct bfd_link_info *info, |
| 890 | asection *p) |
| 891 | { |
| 892 | struct elf_link_hash_table *htab; |
| 893 | asection *ip; |
| 894 | |
| 895 | switch (elf_section_data (p)->this_hdr.sh_type) |
| 896 | { |
| 897 | case SHT_PROGBITS: |
| 898 | case SHT_NOBITS: |
| 899 | /* If sh_type is yet undecided, assume it could be |
| 900 | SHT_PROGBITS/SHT_NOBITS. */ |
| 901 | case SHT_NULL: |
| 902 | htab = elf_hash_table (info); |
| 903 | if (htab->text_index_section != NULL) |
| 904 | return p != htab->text_index_section && p != htab->data_index_section; |
| 905 | |
| 906 | return (htab->dynobj != NULL |
| 907 | && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL |
| 908 | && ip->output_section == p); |
| 909 | |
| 910 | /* There shouldn't be section relative relocations |
| 911 | against any other section. */ |
| 912 | default: |
| 913 | return TRUE; |
| 914 | } |
| 915 | } |
| 916 | |
| 917 | bfd_boolean |
| 918 | _bfd_elf_omit_section_dynsym_all |
| 919 | (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 920 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 921 | asection *p ATTRIBUTE_UNUSED) |
| 922 | { |
| 923 | return TRUE; |
| 924 | } |
| 925 | |
| 926 | /* Assign dynsym indices. In a shared library we generate a section |
| 927 | symbol for each output section, which come first. Next come symbols |
| 928 | which have been forced to local binding. Then all of the back-end |
| 929 | allocated local dynamic syms, followed by the rest of the global |
| 930 | symbols. If SECTION_SYM_COUNT is NULL, section dynindx is not set. |
| 931 | (This prevents the early call before elf_backend_init_index_section |
| 932 | and strip_excluded_output_sections setting dynindx for sections |
| 933 | that are stripped.) */ |
| 934 | |
| 935 | static unsigned long |
| 936 | _bfd_elf_link_renumber_dynsyms (bfd *output_bfd, |
| 937 | struct bfd_link_info *info, |
| 938 | unsigned long *section_sym_count) |
| 939 | { |
| 940 | unsigned long dynsymcount = 0; |
| 941 | bfd_boolean do_sec = section_sym_count != NULL; |
| 942 | |
| 943 | if (bfd_link_pic (info) |
| 944 | || elf_hash_table (info)->is_relocatable_executable) |
| 945 | { |
| 946 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); |
| 947 | asection *p; |
| 948 | for (p = output_bfd->sections; p ; p = p->next) |
| 949 | if ((p->flags & SEC_EXCLUDE) == 0 |
| 950 | && (p->flags & SEC_ALLOC) != 0 |
| 951 | && elf_hash_table (info)->dynamic_relocs |
| 952 | && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p)) |
| 953 | { |
| 954 | ++dynsymcount; |
| 955 | if (do_sec) |
| 956 | elf_section_data (p)->dynindx = dynsymcount; |
| 957 | } |
| 958 | else if (do_sec) |
| 959 | elf_section_data (p)->dynindx = 0; |
| 960 | } |
| 961 | if (do_sec) |
| 962 | *section_sym_count = dynsymcount; |
| 963 | |
| 964 | elf_link_hash_traverse (elf_hash_table (info), |
| 965 | elf_link_renumber_local_hash_table_dynsyms, |
| 966 | &dynsymcount); |
| 967 | |
| 968 | if (elf_hash_table (info)->dynlocal) |
| 969 | { |
| 970 | struct elf_link_local_dynamic_entry *p; |
| 971 | for (p = elf_hash_table (info)->dynlocal; p ; p = p->next) |
| 972 | p->dynindx = ++dynsymcount; |
| 973 | } |
| 974 | elf_hash_table (info)->local_dynsymcount = dynsymcount; |
| 975 | |
| 976 | elf_link_hash_traverse (elf_hash_table (info), |
| 977 | elf_link_renumber_hash_table_dynsyms, |
| 978 | &dynsymcount); |
| 979 | |
| 980 | /* There is an unused NULL entry at the head of the table which we |
| 981 | must account for in our count even if the table is empty since it |
| 982 | is intended for the mandatory DT_SYMTAB tag (.dynsym section) in |
| 983 | .dynamic section. */ |
| 984 | dynsymcount++; |
| 985 | |
| 986 | elf_hash_table (info)->dynsymcount = dynsymcount; |
| 987 | return dynsymcount; |
| 988 | } |
| 989 | |
| 990 | /* Merge st_other field. */ |
| 991 | |
| 992 | static void |
| 993 | elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h, |
| 994 | const Elf_Internal_Sym *isym, asection *sec, |
| 995 | bfd_boolean definition, bfd_boolean dynamic) |
| 996 | { |
| 997 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 998 | |
| 999 | /* If st_other has a processor-specific meaning, specific |
| 1000 | code might be needed here. */ |
| 1001 | if (bed->elf_backend_merge_symbol_attribute) |
| 1002 | (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition, |
| 1003 | dynamic); |
| 1004 | |
| 1005 | if (!dynamic) |
| 1006 | { |
| 1007 | unsigned symvis = ELF_ST_VISIBILITY (isym->st_other); |
| 1008 | unsigned hvis = ELF_ST_VISIBILITY (h->other); |
| 1009 | |
| 1010 | /* Keep the most constraining visibility. Leave the remainder |
| 1011 | of the st_other field to elf_backend_merge_symbol_attribute. */ |
| 1012 | if (symvis - 1 < hvis - 1) |
| 1013 | h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1)); |
| 1014 | } |
| 1015 | else if (definition |
| 1016 | && ELF_ST_VISIBILITY (isym->st_other) != STV_DEFAULT |
| 1017 | && (sec->flags & SEC_READONLY) == 0) |
| 1018 | h->protected_def = 1; |
| 1019 | } |
| 1020 | |
| 1021 | /* This function is called when we want to merge a new symbol with an |
| 1022 | existing symbol. It handles the various cases which arise when we |
| 1023 | find a definition in a dynamic object, or when there is already a |
| 1024 | definition in a dynamic object. The new symbol is described by |
| 1025 | NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table |
| 1026 | entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK |
| 1027 | if the old symbol was weak. We set POLD_ALIGNMENT to the alignment |
| 1028 | of an old common symbol. We set OVERRIDE if the old symbol is |
| 1029 | overriding a new definition. We set TYPE_CHANGE_OK if it is OK for |
| 1030 | the type to change. We set SIZE_CHANGE_OK if it is OK for the size |
| 1031 | to change. By OK to change, we mean that we shouldn't warn if the |
| 1032 | type or size does change. */ |
| 1033 | |
| 1034 | static bfd_boolean |
| 1035 | _bfd_elf_merge_symbol (bfd *abfd, |
| 1036 | struct bfd_link_info *info, |
| 1037 | const char *name, |
| 1038 | Elf_Internal_Sym *sym, |
| 1039 | asection **psec, |
| 1040 | bfd_vma *pvalue, |
| 1041 | struct elf_link_hash_entry **sym_hash, |
| 1042 | bfd **poldbfd, |
| 1043 | bfd_boolean *pold_weak, |
| 1044 | unsigned int *pold_alignment, |
| 1045 | bfd_boolean *skip, |
| 1046 | bfd_boolean *override, |
| 1047 | bfd_boolean *type_change_ok, |
| 1048 | bfd_boolean *size_change_ok, |
| 1049 | bfd_boolean *matched) |
| 1050 | { |
| 1051 | asection *sec, *oldsec; |
| 1052 | struct elf_link_hash_entry *h; |
| 1053 | struct elf_link_hash_entry *hi; |
| 1054 | struct elf_link_hash_entry *flip; |
| 1055 | int bind; |
| 1056 | bfd *oldbfd; |
| 1057 | bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon; |
| 1058 | bfd_boolean newweak, oldweak, newfunc, oldfunc; |
| 1059 | const struct elf_backend_data *bed; |
| 1060 | char *new_version; |
| 1061 | bfd_boolean default_sym = *matched; |
| 1062 | |
| 1063 | *skip = FALSE; |
| 1064 | *override = FALSE; |
| 1065 | |
| 1066 | sec = *psec; |
| 1067 | bind = ELF_ST_BIND (sym->st_info); |
| 1068 | |
| 1069 | if (! bfd_is_und_section (sec)) |
| 1070 | h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE); |
| 1071 | else |
| 1072 | h = ((struct elf_link_hash_entry *) |
| 1073 | bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE)); |
| 1074 | if (h == NULL) |
| 1075 | return FALSE; |
| 1076 | *sym_hash = h; |
| 1077 | |
| 1078 | bed = get_elf_backend_data (abfd); |
| 1079 | |
| 1080 | /* NEW_VERSION is the symbol version of the new symbol. */ |
| 1081 | if (h->versioned != unversioned) |
| 1082 | { |
| 1083 | /* Symbol version is unknown or versioned. */ |
| 1084 | new_version = strrchr (name, ELF_VER_CHR); |
| 1085 | if (new_version) |
| 1086 | { |
| 1087 | if (h->versioned == unknown) |
| 1088 | { |
| 1089 | if (new_version > name && new_version[-1] != ELF_VER_CHR) |
| 1090 | h->versioned = versioned_hidden; |
| 1091 | else |
| 1092 | h->versioned = versioned; |
| 1093 | } |
| 1094 | new_version += 1; |
| 1095 | if (new_version[0] == '\0') |
| 1096 | new_version = NULL; |
| 1097 | } |
| 1098 | else |
| 1099 | h->versioned = unversioned; |
| 1100 | } |
| 1101 | else |
| 1102 | new_version = NULL; |
| 1103 | |
| 1104 | /* For merging, we only care about real symbols. But we need to make |
| 1105 | sure that indirect symbol dynamic flags are updated. */ |
| 1106 | hi = h; |
| 1107 | while (h->root.type == bfd_link_hash_indirect |
| 1108 | || h->root.type == bfd_link_hash_warning) |
| 1109 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1110 | |
| 1111 | if (!*matched) |
| 1112 | { |
| 1113 | if (hi == h || h->root.type == bfd_link_hash_new) |
| 1114 | *matched = TRUE; |
| 1115 | else |
| 1116 | { |
| 1117 | /* OLD_HIDDEN is true if the existing symbol is only visible |
| 1118 | to the symbol with the same symbol version. NEW_HIDDEN is |
| 1119 | true if the new symbol is only visible to the symbol with |
| 1120 | the same symbol version. */ |
| 1121 | bfd_boolean old_hidden = h->versioned == versioned_hidden; |
| 1122 | bfd_boolean new_hidden = hi->versioned == versioned_hidden; |
| 1123 | if (!old_hidden && !new_hidden) |
| 1124 | /* The new symbol matches the existing symbol if both |
| 1125 | aren't hidden. */ |
| 1126 | *matched = TRUE; |
| 1127 | else |
| 1128 | { |
| 1129 | /* OLD_VERSION is the symbol version of the existing |
| 1130 | symbol. */ |
| 1131 | char *old_version; |
| 1132 | |
| 1133 | if (h->versioned >= versioned) |
| 1134 | old_version = strrchr (h->root.root.string, |
| 1135 | ELF_VER_CHR) + 1; |
| 1136 | else |
| 1137 | old_version = NULL; |
| 1138 | |
| 1139 | /* The new symbol matches the existing symbol if they |
| 1140 | have the same symbol version. */ |
| 1141 | *matched = (old_version == new_version |
| 1142 | || (old_version != NULL |
| 1143 | && new_version != NULL |
| 1144 | && strcmp (old_version, new_version) == 0)); |
| 1145 | } |
| 1146 | } |
| 1147 | } |
| 1148 | |
| 1149 | /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the |
| 1150 | existing symbol. */ |
| 1151 | |
| 1152 | oldbfd = NULL; |
| 1153 | oldsec = NULL; |
| 1154 | switch (h->root.type) |
| 1155 | { |
| 1156 | default: |
| 1157 | break; |
| 1158 | |
| 1159 | case bfd_link_hash_undefined: |
| 1160 | case bfd_link_hash_undefweak: |
| 1161 | oldbfd = h->root.u.undef.abfd; |
| 1162 | break; |
| 1163 | |
| 1164 | case bfd_link_hash_defined: |
| 1165 | case bfd_link_hash_defweak: |
| 1166 | oldbfd = h->root.u.def.section->owner; |
| 1167 | oldsec = h->root.u.def.section; |
| 1168 | break; |
| 1169 | |
| 1170 | case bfd_link_hash_common: |
| 1171 | oldbfd = h->root.u.c.p->section->owner; |
| 1172 | oldsec = h->root.u.c.p->section; |
| 1173 | if (pold_alignment) |
| 1174 | *pold_alignment = h->root.u.c.p->alignment_power; |
| 1175 | break; |
| 1176 | } |
| 1177 | if (poldbfd && *poldbfd == NULL) |
| 1178 | *poldbfd = oldbfd; |
| 1179 | |
| 1180 | /* Differentiate strong and weak symbols. */ |
| 1181 | newweak = bind == STB_WEAK; |
| 1182 | oldweak = (h->root.type == bfd_link_hash_defweak |
| 1183 | || h->root.type == bfd_link_hash_undefweak); |
| 1184 | if (pold_weak) |
| 1185 | *pold_weak = oldweak; |
| 1186 | |
| 1187 | /* We have to check it for every instance since the first few may be |
| 1188 | references and not all compilers emit symbol type for undefined |
| 1189 | symbols. */ |
| 1190 | bfd_elf_link_mark_dynamic_symbol (info, h, sym); |
| 1191 | |
| 1192 | /* NEWDYN and OLDDYN indicate whether the new or old symbol, |
| 1193 | respectively, is from a dynamic object. */ |
| 1194 | |
| 1195 | newdyn = (abfd->flags & DYNAMIC) != 0; |
| 1196 | |
| 1197 | /* ref_dynamic_nonweak and dynamic_def flags track actual undefined |
| 1198 | syms and defined syms in dynamic libraries respectively. |
| 1199 | ref_dynamic on the other hand can be set for a symbol defined in |
| 1200 | a dynamic library, and def_dynamic may not be set; When the |
| 1201 | definition in a dynamic lib is overridden by a definition in the |
| 1202 | executable use of the symbol in the dynamic lib becomes a |
| 1203 | reference to the executable symbol. */ |
| 1204 | if (newdyn) |
| 1205 | { |
| 1206 | if (bfd_is_und_section (sec)) |
| 1207 | { |
| 1208 | if (bind != STB_WEAK) |
| 1209 | { |
| 1210 | h->ref_dynamic_nonweak = 1; |
| 1211 | hi->ref_dynamic_nonweak = 1; |
| 1212 | } |
| 1213 | } |
| 1214 | else |
| 1215 | { |
| 1216 | /* Update the existing symbol only if they match. */ |
| 1217 | if (*matched) |
| 1218 | h->dynamic_def = 1; |
| 1219 | hi->dynamic_def = 1; |
| 1220 | } |
| 1221 | } |
| 1222 | |
| 1223 | /* If we just created the symbol, mark it as being an ELF symbol. |
| 1224 | Other than that, there is nothing to do--there is no merge issue |
| 1225 | with a newly defined symbol--so we just return. */ |
| 1226 | |
| 1227 | if (h->root.type == bfd_link_hash_new) |
| 1228 | { |
| 1229 | h->non_elf = 0; |
| 1230 | return TRUE; |
| 1231 | } |
| 1232 | |
| 1233 | /* In cases involving weak versioned symbols, we may wind up trying |
| 1234 | to merge a symbol with itself. Catch that here, to avoid the |
| 1235 | confusion that results if we try to override a symbol with |
| 1236 | itself. The additional tests catch cases like |
| 1237 | _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a |
| 1238 | dynamic object, which we do want to handle here. */ |
| 1239 | if (abfd == oldbfd |
| 1240 | && (newweak || oldweak) |
| 1241 | && ((abfd->flags & DYNAMIC) == 0 |
| 1242 | || !h->def_regular)) |
| 1243 | return TRUE; |
| 1244 | |
| 1245 | olddyn = FALSE; |
| 1246 | if (oldbfd != NULL) |
| 1247 | olddyn = (oldbfd->flags & DYNAMIC) != 0; |
| 1248 | else if (oldsec != NULL) |
| 1249 | { |
| 1250 | /* This handles the special SHN_MIPS_{TEXT,DATA} section |
| 1251 | indices used by MIPS ELF. */ |
| 1252 | olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0; |
| 1253 | } |
| 1254 | |
| 1255 | /* Handle a case where plugin_notice won't be called and thus won't |
| 1256 | set the non_ir_ref flags on the first pass over symbols. */ |
| 1257 | if (oldbfd != NULL |
| 1258 | && (oldbfd->flags & BFD_PLUGIN) != (abfd->flags & BFD_PLUGIN) |
| 1259 | && newdyn != olddyn) |
| 1260 | { |
| 1261 | h->root.non_ir_ref_dynamic = TRUE; |
| 1262 | hi->root.non_ir_ref_dynamic = TRUE; |
| 1263 | } |
| 1264 | |
| 1265 | /* NEWDEF and OLDDEF indicate whether the new or old symbol, |
| 1266 | respectively, appear to be a definition rather than reference. */ |
| 1267 | |
| 1268 | newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec); |
| 1269 | |
| 1270 | olddef = (h->root.type != bfd_link_hash_undefined |
| 1271 | && h->root.type != bfd_link_hash_undefweak |
| 1272 | && h->root.type != bfd_link_hash_common); |
| 1273 | |
| 1274 | /* NEWFUNC and OLDFUNC indicate whether the new or old symbol, |
| 1275 | respectively, appear to be a function. */ |
| 1276 | |
| 1277 | newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE |
| 1278 | && bed->is_function_type (ELF_ST_TYPE (sym->st_info))); |
| 1279 | |
| 1280 | oldfunc = (h->type != STT_NOTYPE |
| 1281 | && bed->is_function_type (h->type)); |
| 1282 | |
| 1283 | if (!(newfunc && oldfunc) |
| 1284 | && ELF_ST_TYPE (sym->st_info) != h->type |
| 1285 | && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE |
| 1286 | && h->type != STT_NOTYPE |
| 1287 | && (newdef || bfd_is_com_section (sec)) |
| 1288 | && (olddef || h->root.type == bfd_link_hash_common)) |
| 1289 | { |
| 1290 | /* If creating a default indirect symbol ("foo" or "foo@") from |
| 1291 | a dynamic versioned definition ("foo@@") skip doing so if |
| 1292 | there is an existing regular definition with a different |
| 1293 | type. We don't want, for example, a "time" variable in the |
| 1294 | executable overriding a "time" function in a shared library. */ |
| 1295 | if (newdyn |
| 1296 | && !olddyn) |
| 1297 | { |
| 1298 | *skip = TRUE; |
| 1299 | return TRUE; |
| 1300 | } |
| 1301 | |
| 1302 | /* When adding a symbol from a regular object file after we have |
| 1303 | created indirect symbols, undo the indirection and any |
| 1304 | dynamic state. */ |
| 1305 | if (hi != h |
| 1306 | && !newdyn |
| 1307 | && olddyn) |
| 1308 | { |
| 1309 | h = hi; |
| 1310 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 1311 | h->forced_local = 0; |
| 1312 | h->ref_dynamic = 0; |
| 1313 | h->def_dynamic = 0; |
| 1314 | h->dynamic_def = 0; |
| 1315 | if (h->root.u.undef.next || info->hash->undefs_tail == &h->root) |
| 1316 | { |
| 1317 | h->root.type = bfd_link_hash_undefined; |
| 1318 | h->root.u.undef.abfd = abfd; |
| 1319 | } |
| 1320 | else |
| 1321 | { |
| 1322 | h->root.type = bfd_link_hash_new; |
| 1323 | h->root.u.undef.abfd = NULL; |
| 1324 | } |
| 1325 | return TRUE; |
| 1326 | } |
| 1327 | } |
| 1328 | |
| 1329 | /* Check TLS symbols. We don't check undefined symbols introduced |
| 1330 | by "ld -u" which have no type (and oldbfd NULL), and we don't |
| 1331 | check symbols from plugins because they also have no type. */ |
| 1332 | if (oldbfd != NULL |
| 1333 | && (oldbfd->flags & BFD_PLUGIN) == 0 |
| 1334 | && (abfd->flags & BFD_PLUGIN) == 0 |
| 1335 | && ELF_ST_TYPE (sym->st_info) != h->type |
| 1336 | && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS)) |
| 1337 | { |
| 1338 | bfd *ntbfd, *tbfd; |
| 1339 | bfd_boolean ntdef, tdef; |
| 1340 | asection *ntsec, *tsec; |
| 1341 | |
| 1342 | if (h->type == STT_TLS) |
| 1343 | { |
| 1344 | ntbfd = abfd; |
| 1345 | ntsec = sec; |
| 1346 | ntdef = newdef; |
| 1347 | tbfd = oldbfd; |
| 1348 | tsec = oldsec; |
| 1349 | tdef = olddef; |
| 1350 | } |
| 1351 | else |
| 1352 | { |
| 1353 | ntbfd = oldbfd; |
| 1354 | ntsec = oldsec; |
| 1355 | ntdef = olddef; |
| 1356 | tbfd = abfd; |
| 1357 | tsec = sec; |
| 1358 | tdef = newdef; |
| 1359 | } |
| 1360 | |
| 1361 | if (tdef && ntdef) |
| 1362 | _bfd_error_handler |
| 1363 | /* xgettext:c-format */ |
| 1364 | (_("%s: TLS definition in %pB section %pA " |
| 1365 | "mismatches non-TLS definition in %pB section %pA"), |
| 1366 | h->root.root.string, tbfd, tsec, ntbfd, ntsec); |
| 1367 | else if (!tdef && !ntdef) |
| 1368 | _bfd_error_handler |
| 1369 | /* xgettext:c-format */ |
| 1370 | (_("%s: TLS reference in %pB " |
| 1371 | "mismatches non-TLS reference in %pB"), |
| 1372 | h->root.root.string, tbfd, ntbfd); |
| 1373 | else if (tdef) |
| 1374 | _bfd_error_handler |
| 1375 | /* xgettext:c-format */ |
| 1376 | (_("%s: TLS definition in %pB section %pA " |
| 1377 | "mismatches non-TLS reference in %pB"), |
| 1378 | h->root.root.string, tbfd, tsec, ntbfd); |
| 1379 | else |
| 1380 | _bfd_error_handler |
| 1381 | /* xgettext:c-format */ |
| 1382 | (_("%s: TLS reference in %pB " |
| 1383 | "mismatches non-TLS definition in %pB section %pA"), |
| 1384 | h->root.root.string, tbfd, ntbfd, ntsec); |
| 1385 | |
| 1386 | bfd_set_error (bfd_error_bad_value); |
| 1387 | return FALSE; |
| 1388 | } |
| 1389 | |
| 1390 | /* If the old symbol has non-default visibility, we ignore the new |
| 1391 | definition from a dynamic object. */ |
| 1392 | if (newdyn |
| 1393 | && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 1394 | && !bfd_is_und_section (sec)) |
| 1395 | { |
| 1396 | *skip = TRUE; |
| 1397 | /* Make sure this symbol is dynamic. */ |
| 1398 | h->ref_dynamic = 1; |
| 1399 | hi->ref_dynamic = 1; |
| 1400 | /* A protected symbol has external availability. Make sure it is |
| 1401 | recorded as dynamic. |
| 1402 | |
| 1403 | FIXME: Should we check type and size for protected symbol? */ |
| 1404 | if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| 1405 | return bfd_elf_link_record_dynamic_symbol (info, h); |
| 1406 | else |
| 1407 | return TRUE; |
| 1408 | } |
| 1409 | else if (!newdyn |
| 1410 | && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT |
| 1411 | && h->def_dynamic) |
| 1412 | { |
| 1413 | /* If the new symbol with non-default visibility comes from a |
| 1414 | relocatable file and the old definition comes from a dynamic |
| 1415 | object, we remove the old definition. */ |
| 1416 | if (hi->root.type == bfd_link_hash_indirect) |
| 1417 | { |
| 1418 | /* Handle the case where the old dynamic definition is |
| 1419 | default versioned. We need to copy the symbol info from |
| 1420 | the symbol with default version to the normal one if it |
| 1421 | was referenced before. */ |
| 1422 | if (h->ref_regular) |
| 1423 | { |
| 1424 | hi->root.type = h->root.type; |
| 1425 | h->root.type = bfd_link_hash_indirect; |
| 1426 | (*bed->elf_backend_copy_indirect_symbol) (info, hi, h); |
| 1427 | |
| 1428 | h->root.u.i.link = (struct bfd_link_hash_entry *) hi; |
| 1429 | if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED) |
| 1430 | { |
| 1431 | /* If the new symbol is hidden or internal, completely undo |
| 1432 | any dynamic link state. */ |
| 1433 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 1434 | h->forced_local = 0; |
| 1435 | h->ref_dynamic = 0; |
| 1436 | } |
| 1437 | else |
| 1438 | h->ref_dynamic = 1; |
| 1439 | |
| 1440 | h->def_dynamic = 0; |
| 1441 | /* FIXME: Should we check type and size for protected symbol? */ |
| 1442 | h->size = 0; |
| 1443 | h->type = 0; |
| 1444 | |
| 1445 | h = hi; |
| 1446 | } |
| 1447 | else |
| 1448 | h = hi; |
| 1449 | } |
| 1450 | |
| 1451 | /* If the old symbol was undefined before, then it will still be |
| 1452 | on the undefs list. If the new symbol is undefined or |
| 1453 | common, we can't make it bfd_link_hash_new here, because new |
| 1454 | undefined or common symbols will be added to the undefs list |
| 1455 | by _bfd_generic_link_add_one_symbol. Symbols may not be |
| 1456 | added twice to the undefs list. Also, if the new symbol is |
| 1457 | undefweak then we don't want to lose the strong undef. */ |
| 1458 | if (h->root.u.undef.next || info->hash->undefs_tail == &h->root) |
| 1459 | { |
| 1460 | h->root.type = bfd_link_hash_undefined; |
| 1461 | h->root.u.undef.abfd = abfd; |
| 1462 | } |
| 1463 | else |
| 1464 | { |
| 1465 | h->root.type = bfd_link_hash_new; |
| 1466 | h->root.u.undef.abfd = NULL; |
| 1467 | } |
| 1468 | |
| 1469 | if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED) |
| 1470 | { |
| 1471 | /* If the new symbol is hidden or internal, completely undo |
| 1472 | any dynamic link state. */ |
| 1473 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 1474 | h->forced_local = 0; |
| 1475 | h->ref_dynamic = 0; |
| 1476 | } |
| 1477 | else |
| 1478 | h->ref_dynamic = 1; |
| 1479 | h->def_dynamic = 0; |
| 1480 | /* FIXME: Should we check type and size for protected symbol? */ |
| 1481 | h->size = 0; |
| 1482 | h->type = 0; |
| 1483 | return TRUE; |
| 1484 | } |
| 1485 | |
| 1486 | /* If a new weak symbol definition comes from a regular file and the |
| 1487 | old symbol comes from a dynamic library, we treat the new one as |
| 1488 | strong. Similarly, an old weak symbol definition from a regular |
| 1489 | file is treated as strong when the new symbol comes from a dynamic |
| 1490 | library. Further, an old weak symbol from a dynamic library is |
| 1491 | treated as strong if the new symbol is from a dynamic library. |
| 1492 | This reflects the way glibc's ld.so works. |
| 1493 | |
| 1494 | Also allow a weak symbol to override a linker script symbol |
| 1495 | defined by an early pass over the script. This is done so the |
| 1496 | linker knows the symbol is defined in an object file, for the |
| 1497 | DEFINED script function. |
| 1498 | |
| 1499 | Do this before setting *type_change_ok or *size_change_ok so that |
| 1500 | we warn properly when dynamic library symbols are overridden. */ |
| 1501 | |
| 1502 | if (newdef && !newdyn && (olddyn || h->root.ldscript_def)) |
| 1503 | newweak = FALSE; |
| 1504 | if (olddef && newdyn) |
| 1505 | oldweak = FALSE; |
| 1506 | |
| 1507 | /* Allow changes between different types of function symbol. */ |
| 1508 | if (newfunc && oldfunc) |
| 1509 | *type_change_ok = TRUE; |
| 1510 | |
| 1511 | /* It's OK to change the type if either the existing symbol or the |
| 1512 | new symbol is weak. A type change is also OK if the old symbol |
| 1513 | is undefined and the new symbol is defined. */ |
| 1514 | |
| 1515 | if (oldweak |
| 1516 | || newweak |
| 1517 | || (newdef |
| 1518 | && h->root.type == bfd_link_hash_undefined)) |
| 1519 | *type_change_ok = TRUE; |
| 1520 | |
| 1521 | /* It's OK to change the size if either the existing symbol or the |
| 1522 | new symbol is weak, or if the old symbol is undefined. */ |
| 1523 | |
| 1524 | if (*type_change_ok |
| 1525 | || h->root.type == bfd_link_hash_undefined) |
| 1526 | *size_change_ok = TRUE; |
| 1527 | |
| 1528 | /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old |
| 1529 | symbol, respectively, appears to be a common symbol in a dynamic |
| 1530 | object. If a symbol appears in an uninitialized section, and is |
| 1531 | not weak, and is not a function, then it may be a common symbol |
| 1532 | which was resolved when the dynamic object was created. We want |
| 1533 | to treat such symbols specially, because they raise special |
| 1534 | considerations when setting the symbol size: if the symbol |
| 1535 | appears as a common symbol in a regular object, and the size in |
| 1536 | the regular object is larger, we must make sure that we use the |
| 1537 | larger size. This problematic case can always be avoided in C, |
| 1538 | but it must be handled correctly when using Fortran shared |
| 1539 | libraries. |
| 1540 | |
| 1541 | Note that if NEWDYNCOMMON is set, NEWDEF will be set, and |
| 1542 | likewise for OLDDYNCOMMON and OLDDEF. |
| 1543 | |
| 1544 | Note that this test is just a heuristic, and that it is quite |
| 1545 | possible to have an uninitialized symbol in a shared object which |
| 1546 | is really a definition, rather than a common symbol. This could |
| 1547 | lead to some minor confusion when the symbol really is a common |
| 1548 | symbol in some regular object. However, I think it will be |
| 1549 | harmless. */ |
| 1550 | |
| 1551 | if (newdyn |
| 1552 | && newdef |
| 1553 | && !newweak |
| 1554 | && (sec->flags & SEC_ALLOC) != 0 |
| 1555 | && (sec->flags & SEC_LOAD) == 0 |
| 1556 | && sym->st_size > 0 |
| 1557 | && !newfunc) |
| 1558 | newdyncommon = TRUE; |
| 1559 | else |
| 1560 | newdyncommon = FALSE; |
| 1561 | |
| 1562 | if (olddyn |
| 1563 | && olddef |
| 1564 | && h->root.type == bfd_link_hash_defined |
| 1565 | && h->def_dynamic |
| 1566 | && (h->root.u.def.section->flags & SEC_ALLOC) != 0 |
| 1567 | && (h->root.u.def.section->flags & SEC_LOAD) == 0 |
| 1568 | && h->size > 0 |
| 1569 | && !oldfunc) |
| 1570 | olddyncommon = TRUE; |
| 1571 | else |
| 1572 | olddyncommon = FALSE; |
| 1573 | |
| 1574 | /* We now know everything about the old and new symbols. We ask the |
| 1575 | backend to check if we can merge them. */ |
| 1576 | if (bed->merge_symbol != NULL) |
| 1577 | { |
| 1578 | if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec)) |
| 1579 | return FALSE; |
| 1580 | sec = *psec; |
| 1581 | } |
| 1582 | |
| 1583 | /* There are multiple definitions of a normal symbol. Skip the |
| 1584 | default symbol as well as definition from an IR object. */ |
| 1585 | if (olddef && !olddyn && !oldweak && newdef && !newdyn && !newweak |
| 1586 | && !default_sym && h->def_regular |
| 1587 | && !(oldbfd != NULL |
| 1588 | && (oldbfd->flags & BFD_PLUGIN) != 0 |
| 1589 | && (abfd->flags & BFD_PLUGIN) == 0)) |
| 1590 | { |
| 1591 | /* Handle a multiple definition. */ |
| 1592 | (*info->callbacks->multiple_definition) (info, &h->root, |
| 1593 | abfd, sec, *pvalue); |
| 1594 | *skip = TRUE; |
| 1595 | return TRUE; |
| 1596 | } |
| 1597 | |
| 1598 | /* If both the old and the new symbols look like common symbols in a |
| 1599 | dynamic object, set the size of the symbol to the larger of the |
| 1600 | two. */ |
| 1601 | |
| 1602 | if (olddyncommon |
| 1603 | && newdyncommon |
| 1604 | && sym->st_size != h->size) |
| 1605 | { |
| 1606 | /* Since we think we have two common symbols, issue a multiple |
| 1607 | common warning if desired. Note that we only warn if the |
| 1608 | size is different. If the size is the same, we simply let |
| 1609 | the old symbol override the new one as normally happens with |
| 1610 | symbols defined in dynamic objects. */ |
| 1611 | |
| 1612 | (*info->callbacks->multiple_common) (info, &h->root, abfd, |
| 1613 | bfd_link_hash_common, sym->st_size); |
| 1614 | if (sym->st_size > h->size) |
| 1615 | h->size = sym->st_size; |
| 1616 | |
| 1617 | *size_change_ok = TRUE; |
| 1618 | } |
| 1619 | |
| 1620 | /* If we are looking at a dynamic object, and we have found a |
| 1621 | definition, we need to see if the symbol was already defined by |
| 1622 | some other object. If so, we want to use the existing |
| 1623 | definition, and we do not want to report a multiple symbol |
| 1624 | definition error; we do this by clobbering *PSEC to be |
| 1625 | bfd_und_section_ptr. |
| 1626 | |
| 1627 | We treat a common symbol as a definition if the symbol in the |
| 1628 | shared library is a function, since common symbols always |
| 1629 | represent variables; this can cause confusion in principle, but |
| 1630 | any such confusion would seem to indicate an erroneous program or |
| 1631 | shared library. We also permit a common symbol in a regular |
| 1632 | object to override a weak symbol in a shared object. */ |
| 1633 | |
| 1634 | if (newdyn |
| 1635 | && newdef |
| 1636 | && (olddef |
| 1637 | || (h->root.type == bfd_link_hash_common |
| 1638 | && (newweak || newfunc)))) |
| 1639 | { |
| 1640 | *override = TRUE; |
| 1641 | newdef = FALSE; |
| 1642 | newdyncommon = FALSE; |
| 1643 | |
| 1644 | *psec = sec = bfd_und_section_ptr; |
| 1645 | *size_change_ok = TRUE; |
| 1646 | |
| 1647 | /* If we get here when the old symbol is a common symbol, then |
| 1648 | we are explicitly letting it override a weak symbol or |
| 1649 | function in a dynamic object, and we don't want to warn about |
| 1650 | a type change. If the old symbol is a defined symbol, a type |
| 1651 | change warning may still be appropriate. */ |
| 1652 | |
| 1653 | if (h->root.type == bfd_link_hash_common) |
| 1654 | *type_change_ok = TRUE; |
| 1655 | } |
| 1656 | |
| 1657 | /* Handle the special case of an old common symbol merging with a |
| 1658 | new symbol which looks like a common symbol in a shared object. |
| 1659 | We change *PSEC and *PVALUE to make the new symbol look like a |
| 1660 | common symbol, and let _bfd_generic_link_add_one_symbol do the |
| 1661 | right thing. */ |
| 1662 | |
| 1663 | if (newdyncommon |
| 1664 | && h->root.type == bfd_link_hash_common) |
| 1665 | { |
| 1666 | *override = TRUE; |
| 1667 | newdef = FALSE; |
| 1668 | newdyncommon = FALSE; |
| 1669 | *pvalue = sym->st_size; |
| 1670 | *psec = sec = bed->common_section (oldsec); |
| 1671 | *size_change_ok = TRUE; |
| 1672 | } |
| 1673 | |
| 1674 | /* Skip weak definitions of symbols that are already defined. */ |
| 1675 | if (newdef && olddef && newweak) |
| 1676 | { |
| 1677 | /* Don't skip new non-IR weak syms. */ |
| 1678 | if (!(oldbfd != NULL |
| 1679 | && (oldbfd->flags & BFD_PLUGIN) != 0 |
| 1680 | && (abfd->flags & BFD_PLUGIN) == 0)) |
| 1681 | { |
| 1682 | newdef = FALSE; |
| 1683 | *skip = TRUE; |
| 1684 | } |
| 1685 | |
| 1686 | /* Merge st_other. If the symbol already has a dynamic index, |
| 1687 | but visibility says it should not be visible, turn it into a |
| 1688 | local symbol. */ |
| 1689 | elf_merge_st_other (abfd, h, sym, sec, newdef, newdyn); |
| 1690 | if (h->dynindx != -1) |
| 1691 | switch (ELF_ST_VISIBILITY (h->other)) |
| 1692 | { |
| 1693 | case STV_INTERNAL: |
| 1694 | case STV_HIDDEN: |
| 1695 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 1696 | break; |
| 1697 | } |
| 1698 | } |
| 1699 | |
| 1700 | /* If the old symbol is from a dynamic object, and the new symbol is |
| 1701 | a definition which is not from a dynamic object, then the new |
| 1702 | symbol overrides the old symbol. Symbols from regular files |
| 1703 | always take precedence over symbols from dynamic objects, even if |
| 1704 | they are defined after the dynamic object in the link. |
| 1705 | |
| 1706 | As above, we again permit a common symbol in a regular object to |
| 1707 | override a definition in a shared object if the shared object |
| 1708 | symbol is a function or is weak. */ |
| 1709 | |
| 1710 | flip = NULL; |
| 1711 | if (!newdyn |
| 1712 | && (newdef |
| 1713 | || (bfd_is_com_section (sec) |
| 1714 | && (oldweak || oldfunc))) |
| 1715 | && olddyn |
| 1716 | && olddef |
| 1717 | && h->def_dynamic) |
| 1718 | { |
| 1719 | /* Change the hash table entry to undefined, and let |
| 1720 | _bfd_generic_link_add_one_symbol do the right thing with the |
| 1721 | new definition. */ |
| 1722 | |
| 1723 | h->root.type = bfd_link_hash_undefined; |
| 1724 | h->root.u.undef.abfd = h->root.u.def.section->owner; |
| 1725 | *size_change_ok = TRUE; |
| 1726 | |
| 1727 | olddef = FALSE; |
| 1728 | olddyncommon = FALSE; |
| 1729 | |
| 1730 | /* We again permit a type change when a common symbol may be |
| 1731 | overriding a function. */ |
| 1732 | |
| 1733 | if (bfd_is_com_section (sec)) |
| 1734 | { |
| 1735 | if (oldfunc) |
| 1736 | { |
| 1737 | /* If a common symbol overrides a function, make sure |
| 1738 | that it isn't defined dynamically nor has type |
| 1739 | function. */ |
| 1740 | h->def_dynamic = 0; |
| 1741 | h->type = STT_NOTYPE; |
| 1742 | } |
| 1743 | *type_change_ok = TRUE; |
| 1744 | } |
| 1745 | |
| 1746 | if (hi->root.type == bfd_link_hash_indirect) |
| 1747 | flip = hi; |
| 1748 | else |
| 1749 | /* This union may have been set to be non-NULL when this symbol |
| 1750 | was seen in a dynamic object. We must force the union to be |
| 1751 | NULL, so that it is correct for a regular symbol. */ |
| 1752 | h->verinfo.vertree = NULL; |
| 1753 | } |
| 1754 | |
| 1755 | /* Handle the special case of a new common symbol merging with an |
| 1756 | old symbol that looks like it might be a common symbol defined in |
| 1757 | a shared object. Note that we have already handled the case in |
| 1758 | which a new common symbol should simply override the definition |
| 1759 | in the shared library. */ |
| 1760 | |
| 1761 | if (! newdyn |
| 1762 | && bfd_is_com_section (sec) |
| 1763 | && olddyncommon) |
| 1764 | { |
| 1765 | /* It would be best if we could set the hash table entry to a |
| 1766 | common symbol, but we don't know what to use for the section |
| 1767 | or the alignment. */ |
| 1768 | (*info->callbacks->multiple_common) (info, &h->root, abfd, |
| 1769 | bfd_link_hash_common, sym->st_size); |
| 1770 | |
| 1771 | /* If the presumed common symbol in the dynamic object is |
| 1772 | larger, pretend that the new symbol has its size. */ |
| 1773 | |
| 1774 | if (h->size > *pvalue) |
| 1775 | *pvalue = h->size; |
| 1776 | |
| 1777 | /* We need to remember the alignment required by the symbol |
| 1778 | in the dynamic object. */ |
| 1779 | BFD_ASSERT (pold_alignment); |
| 1780 | *pold_alignment = h->root.u.def.section->alignment_power; |
| 1781 | |
| 1782 | olddef = FALSE; |
| 1783 | olddyncommon = FALSE; |
| 1784 | |
| 1785 | h->root.type = bfd_link_hash_undefined; |
| 1786 | h->root.u.undef.abfd = h->root.u.def.section->owner; |
| 1787 | |
| 1788 | *size_change_ok = TRUE; |
| 1789 | *type_change_ok = TRUE; |
| 1790 | |
| 1791 | if (hi->root.type == bfd_link_hash_indirect) |
| 1792 | flip = hi; |
| 1793 | else |
| 1794 | h->verinfo.vertree = NULL; |
| 1795 | } |
| 1796 | |
| 1797 | if (flip != NULL) |
| 1798 | { |
| 1799 | /* Handle the case where we had a versioned symbol in a dynamic |
| 1800 | library and now find a definition in a normal object. In this |
| 1801 | case, we make the versioned symbol point to the normal one. */ |
| 1802 | flip->root.type = h->root.type; |
| 1803 | flip->root.u.undef.abfd = h->root.u.undef.abfd; |
| 1804 | h->root.type = bfd_link_hash_indirect; |
| 1805 | h->root.u.i.link = (struct bfd_link_hash_entry *) flip; |
| 1806 | (*bed->elf_backend_copy_indirect_symbol) (info, flip, h); |
| 1807 | if (h->def_dynamic) |
| 1808 | { |
| 1809 | h->def_dynamic = 0; |
| 1810 | flip->ref_dynamic = 1; |
| 1811 | } |
| 1812 | } |
| 1813 | |
| 1814 | return TRUE; |
| 1815 | } |
| 1816 | |
| 1817 | /* This function is called to create an indirect symbol from the |
| 1818 | default for the symbol with the default version if needed. The |
| 1819 | symbol is described by H, NAME, SYM, SEC, and VALUE. We |
| 1820 | set DYNSYM if the new indirect symbol is dynamic. */ |
| 1821 | |
| 1822 | static bfd_boolean |
| 1823 | _bfd_elf_add_default_symbol (bfd *abfd, |
| 1824 | struct bfd_link_info *info, |
| 1825 | struct elf_link_hash_entry *h, |
| 1826 | const char *name, |
| 1827 | Elf_Internal_Sym *sym, |
| 1828 | asection *sec, |
| 1829 | bfd_vma value, |
| 1830 | bfd **poldbfd, |
| 1831 | bfd_boolean *dynsym) |
| 1832 | { |
| 1833 | bfd_boolean type_change_ok; |
| 1834 | bfd_boolean size_change_ok; |
| 1835 | bfd_boolean skip; |
| 1836 | char *shortname; |
| 1837 | struct elf_link_hash_entry *hi; |
| 1838 | struct bfd_link_hash_entry *bh; |
| 1839 | const struct elf_backend_data *bed; |
| 1840 | bfd_boolean collect; |
| 1841 | bfd_boolean dynamic; |
| 1842 | bfd_boolean override; |
| 1843 | char *p; |
| 1844 | size_t len, shortlen; |
| 1845 | asection *tmp_sec; |
| 1846 | bfd_boolean matched; |
| 1847 | |
| 1848 | if (h->versioned == unversioned || h->versioned == versioned_hidden) |
| 1849 | return TRUE; |
| 1850 | |
| 1851 | /* If this symbol has a version, and it is the default version, we |
| 1852 | create an indirect symbol from the default name to the fully |
| 1853 | decorated name. This will cause external references which do not |
| 1854 | specify a version to be bound to this version of the symbol. */ |
| 1855 | p = strchr (name, ELF_VER_CHR); |
| 1856 | if (h->versioned == unknown) |
| 1857 | { |
| 1858 | if (p == NULL) |
| 1859 | { |
| 1860 | h->versioned = unversioned; |
| 1861 | return TRUE; |
| 1862 | } |
| 1863 | else |
| 1864 | { |
| 1865 | if (p[1] != ELF_VER_CHR) |
| 1866 | { |
| 1867 | h->versioned = versioned_hidden; |
| 1868 | return TRUE; |
| 1869 | } |
| 1870 | else |
| 1871 | h->versioned = versioned; |
| 1872 | } |
| 1873 | } |
| 1874 | else |
| 1875 | { |
| 1876 | /* PR ld/19073: We may see an unversioned definition after the |
| 1877 | default version. */ |
| 1878 | if (p == NULL) |
| 1879 | return TRUE; |
| 1880 | } |
| 1881 | |
| 1882 | bed = get_elf_backend_data (abfd); |
| 1883 | collect = bed->collect; |
| 1884 | dynamic = (abfd->flags & DYNAMIC) != 0; |
| 1885 | |
| 1886 | shortlen = p - name; |
| 1887 | shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1); |
| 1888 | if (shortname == NULL) |
| 1889 | return FALSE; |
| 1890 | memcpy (shortname, name, shortlen); |
| 1891 | shortname[shortlen] = '\0'; |
| 1892 | |
| 1893 | /* We are going to create a new symbol. Merge it with any existing |
| 1894 | symbol with this name. For the purposes of the merge, act as |
| 1895 | though we were defining the symbol we just defined, although we |
| 1896 | actually going to define an indirect symbol. */ |
| 1897 | type_change_ok = FALSE; |
| 1898 | size_change_ok = FALSE; |
| 1899 | matched = TRUE; |
| 1900 | tmp_sec = sec; |
| 1901 | if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value, |
| 1902 | &hi, poldbfd, NULL, NULL, &skip, &override, |
| 1903 | &type_change_ok, &size_change_ok, &matched)) |
| 1904 | return FALSE; |
| 1905 | |
| 1906 | if (skip) |
| 1907 | goto nondefault; |
| 1908 | |
| 1909 | if (hi->def_regular) |
| 1910 | { |
| 1911 | /* If the undecorated symbol will have a version added by a |
| 1912 | script different to H, then don't indirect to/from the |
| 1913 | undecorated symbol. This isn't ideal because we may not yet |
| 1914 | have seen symbol versions, if given by a script on the |
| 1915 | command line rather than via --version-script. */ |
| 1916 | if (hi->verinfo.vertree == NULL && info->version_info != NULL) |
| 1917 | { |
| 1918 | bfd_boolean hide; |
| 1919 | |
| 1920 | hi->verinfo.vertree |
| 1921 | = bfd_find_version_for_sym (info->version_info, |
| 1922 | hi->root.root.string, &hide); |
| 1923 | if (hi->verinfo.vertree != NULL && hide) |
| 1924 | { |
| 1925 | (*bed->elf_backend_hide_symbol) (info, hi, TRUE); |
| 1926 | goto nondefault; |
| 1927 | } |
| 1928 | } |
| 1929 | if (hi->verinfo.vertree != NULL |
| 1930 | && strcmp (p + 1 + (p[1] == '@'), hi->verinfo.vertree->name) != 0) |
| 1931 | goto nondefault; |
| 1932 | } |
| 1933 | |
| 1934 | if (! override) |
| 1935 | { |
| 1936 | /* Add the default symbol if not performing a relocatable link. */ |
| 1937 | if (! bfd_link_relocatable (info)) |
| 1938 | { |
| 1939 | bh = &hi->root; |
| 1940 | if (bh->type == bfd_link_hash_defined |
| 1941 | && bh->u.def.section->owner != NULL |
| 1942 | && (bh->u.def.section->owner->flags & BFD_PLUGIN) != 0) |
| 1943 | { |
| 1944 | /* Mark the previous definition from IR object as |
| 1945 | undefined so that the generic linker will override |
| 1946 | it. */ |
| 1947 | bh->type = bfd_link_hash_undefined; |
| 1948 | bh->u.undef.abfd = bh->u.def.section->owner; |
| 1949 | } |
| 1950 | if (! (_bfd_generic_link_add_one_symbol |
| 1951 | (info, abfd, shortname, BSF_INDIRECT, |
| 1952 | bfd_ind_section_ptr, |
| 1953 | 0, name, FALSE, collect, &bh))) |
| 1954 | return FALSE; |
| 1955 | hi = (struct elf_link_hash_entry *) bh; |
| 1956 | } |
| 1957 | } |
| 1958 | else |
| 1959 | { |
| 1960 | /* In this case the symbol named SHORTNAME is overriding the |
| 1961 | indirect symbol we want to add. We were planning on making |
| 1962 | SHORTNAME an indirect symbol referring to NAME. SHORTNAME |
| 1963 | is the name without a version. NAME is the fully versioned |
| 1964 | name, and it is the default version. |
| 1965 | |
| 1966 | Overriding means that we already saw a definition for the |
| 1967 | symbol SHORTNAME in a regular object, and it is overriding |
| 1968 | the symbol defined in the dynamic object. |
| 1969 | |
| 1970 | When this happens, we actually want to change NAME, the |
| 1971 | symbol we just added, to refer to SHORTNAME. This will cause |
| 1972 | references to NAME in the shared object to become references |
| 1973 | to SHORTNAME in the regular object. This is what we expect |
| 1974 | when we override a function in a shared object: that the |
| 1975 | references in the shared object will be mapped to the |
| 1976 | definition in the regular object. */ |
| 1977 | |
| 1978 | while (hi->root.type == bfd_link_hash_indirect |
| 1979 | || hi->root.type == bfd_link_hash_warning) |
| 1980 | hi = (struct elf_link_hash_entry *) hi->root.u.i.link; |
| 1981 | |
| 1982 | h->root.type = bfd_link_hash_indirect; |
| 1983 | h->root.u.i.link = (struct bfd_link_hash_entry *) hi; |
| 1984 | if (h->def_dynamic) |
| 1985 | { |
| 1986 | h->def_dynamic = 0; |
| 1987 | hi->ref_dynamic = 1; |
| 1988 | if (hi->ref_regular |
| 1989 | || hi->def_regular) |
| 1990 | { |
| 1991 | if (! bfd_elf_link_record_dynamic_symbol (info, hi)) |
| 1992 | return FALSE; |
| 1993 | } |
| 1994 | } |
| 1995 | |
| 1996 | /* Now set HI to H, so that the following code will set the |
| 1997 | other fields correctly. */ |
| 1998 | hi = h; |
| 1999 | } |
| 2000 | |
| 2001 | /* Check if HI is a warning symbol. */ |
| 2002 | if (hi->root.type == bfd_link_hash_warning) |
| 2003 | hi = (struct elf_link_hash_entry *) hi->root.u.i.link; |
| 2004 | |
| 2005 | /* If there is a duplicate definition somewhere, then HI may not |
| 2006 | point to an indirect symbol. We will have reported an error to |
| 2007 | the user in that case. */ |
| 2008 | |
| 2009 | if (hi->root.type == bfd_link_hash_indirect) |
| 2010 | { |
| 2011 | struct elf_link_hash_entry *ht; |
| 2012 | |
| 2013 | ht = (struct elf_link_hash_entry *) hi->root.u.i.link; |
| 2014 | (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi); |
| 2015 | |
| 2016 | /* A reference to the SHORTNAME symbol from a dynamic library |
| 2017 | will be satisfied by the versioned symbol at runtime. In |
| 2018 | effect, we have a reference to the versioned symbol. */ |
| 2019 | ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak; |
| 2020 | hi->dynamic_def |= ht->dynamic_def; |
| 2021 | |
| 2022 | /* See if the new flags lead us to realize that the symbol must |
| 2023 | be dynamic. */ |
| 2024 | if (! *dynsym) |
| 2025 | { |
| 2026 | if (! dynamic) |
| 2027 | { |
| 2028 | if (! bfd_link_executable (info) |
| 2029 | || hi->def_dynamic |
| 2030 | || hi->ref_dynamic) |
| 2031 | *dynsym = TRUE; |
| 2032 | } |
| 2033 | else |
| 2034 | { |
| 2035 | if (hi->ref_regular) |
| 2036 | *dynsym = TRUE; |
| 2037 | } |
| 2038 | } |
| 2039 | } |
| 2040 | |
| 2041 | /* We also need to define an indirection from the nondefault version |
| 2042 | of the symbol. */ |
| 2043 | |
| 2044 | nondefault: |
| 2045 | len = strlen (name); |
| 2046 | shortname = (char *) bfd_hash_allocate (&info->hash->table, len); |
| 2047 | if (shortname == NULL) |
| 2048 | return FALSE; |
| 2049 | memcpy (shortname, name, shortlen); |
| 2050 | memcpy (shortname + shortlen, p + 1, len - shortlen); |
| 2051 | |
| 2052 | /* Once again, merge with any existing symbol. */ |
| 2053 | type_change_ok = FALSE; |
| 2054 | size_change_ok = FALSE; |
| 2055 | tmp_sec = sec; |
| 2056 | if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value, |
| 2057 | &hi, poldbfd, NULL, NULL, &skip, &override, |
| 2058 | &type_change_ok, &size_change_ok, &matched)) |
| 2059 | return FALSE; |
| 2060 | |
| 2061 | if (skip) |
| 2062 | return TRUE; |
| 2063 | |
| 2064 | if (override) |
| 2065 | { |
| 2066 | /* Here SHORTNAME is a versioned name, so we don't expect to see |
| 2067 | the type of override we do in the case above unless it is |
| 2068 | overridden by a versioned definition. */ |
| 2069 | if (hi->root.type != bfd_link_hash_defined |
| 2070 | && hi->root.type != bfd_link_hash_defweak) |
| 2071 | _bfd_error_handler |
| 2072 | /* xgettext:c-format */ |
| 2073 | (_("%pB: unexpected redefinition of indirect versioned symbol `%s'"), |
| 2074 | abfd, shortname); |
| 2075 | } |
| 2076 | else |
| 2077 | { |
| 2078 | bh = &hi->root; |
| 2079 | if (! (_bfd_generic_link_add_one_symbol |
| 2080 | (info, abfd, shortname, BSF_INDIRECT, |
| 2081 | bfd_ind_section_ptr, 0, name, FALSE, collect, &bh))) |
| 2082 | return FALSE; |
| 2083 | hi = (struct elf_link_hash_entry *) bh; |
| 2084 | |
| 2085 | /* If there is a duplicate definition somewhere, then HI may not |
| 2086 | point to an indirect symbol. We will have reported an error |
| 2087 | to the user in that case. */ |
| 2088 | |
| 2089 | if (hi->root.type == bfd_link_hash_indirect) |
| 2090 | { |
| 2091 | (*bed->elf_backend_copy_indirect_symbol) (info, h, hi); |
| 2092 | h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak; |
| 2093 | hi->dynamic_def |= h->dynamic_def; |
| 2094 | |
| 2095 | /* See if the new flags lead us to realize that the symbol |
| 2096 | must be dynamic. */ |
| 2097 | if (! *dynsym) |
| 2098 | { |
| 2099 | if (! dynamic) |
| 2100 | { |
| 2101 | if (! bfd_link_executable (info) |
| 2102 | || hi->ref_dynamic) |
| 2103 | *dynsym = TRUE; |
| 2104 | } |
| 2105 | else |
| 2106 | { |
| 2107 | if (hi->ref_regular) |
| 2108 | *dynsym = TRUE; |
| 2109 | } |
| 2110 | } |
| 2111 | } |
| 2112 | } |
| 2113 | |
| 2114 | return TRUE; |
| 2115 | } |
| 2116 | \f |
| 2117 | /* This routine is used to export all defined symbols into the dynamic |
| 2118 | symbol table. It is called via elf_link_hash_traverse. */ |
| 2119 | |
| 2120 | static bfd_boolean |
| 2121 | _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data) |
| 2122 | { |
| 2123 | struct elf_info_failed *eif = (struct elf_info_failed *) data; |
| 2124 | |
| 2125 | /* Ignore indirect symbols. These are added by the versioning code. */ |
| 2126 | if (h->root.type == bfd_link_hash_indirect) |
| 2127 | return TRUE; |
| 2128 | |
| 2129 | /* Ignore this if we won't export it. */ |
| 2130 | if (!eif->info->export_dynamic && !h->dynamic) |
| 2131 | return TRUE; |
| 2132 | |
| 2133 | if (h->dynindx == -1 |
| 2134 | && (h->def_regular || h->ref_regular) |
| 2135 | && ! bfd_hide_sym_by_version (eif->info->version_info, |
| 2136 | h->root.root.string)) |
| 2137 | { |
| 2138 | if (! bfd_elf_link_record_dynamic_symbol (eif->info, h)) |
| 2139 | { |
| 2140 | eif->failed = TRUE; |
| 2141 | return FALSE; |
| 2142 | } |
| 2143 | } |
| 2144 | |
| 2145 | return TRUE; |
| 2146 | } |
| 2147 | \f |
| 2148 | /* Look through the symbols which are defined in other shared |
| 2149 | libraries and referenced here. Update the list of version |
| 2150 | dependencies. This will be put into the .gnu.version_r section. |
| 2151 | This function is called via elf_link_hash_traverse. */ |
| 2152 | |
| 2153 | static bfd_boolean |
| 2154 | _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h, |
| 2155 | void *data) |
| 2156 | { |
| 2157 | struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data; |
| 2158 | Elf_Internal_Verneed *t; |
| 2159 | Elf_Internal_Vernaux *a; |
| 2160 | bfd_size_type amt; |
| 2161 | |
| 2162 | /* We only care about symbols defined in shared objects with version |
| 2163 | information. */ |
| 2164 | if (!h->def_dynamic |
| 2165 | || h->def_regular |
| 2166 | || h->dynindx == -1 |
| 2167 | || h->verinfo.verdef == NULL |
| 2168 | || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd) |
| 2169 | & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED))) |
| 2170 | return TRUE; |
| 2171 | |
| 2172 | /* See if we already know about this version. */ |
| 2173 | for (t = elf_tdata (rinfo->info->output_bfd)->verref; |
| 2174 | t != NULL; |
| 2175 | t = t->vn_nextref) |
| 2176 | { |
| 2177 | if (t->vn_bfd != h->verinfo.verdef->vd_bfd) |
| 2178 | continue; |
| 2179 | |
| 2180 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 2181 | if (a->vna_nodename == h->verinfo.verdef->vd_nodename) |
| 2182 | return TRUE; |
| 2183 | |
| 2184 | break; |
| 2185 | } |
| 2186 | |
| 2187 | /* This is a new version. Add it to tree we are building. */ |
| 2188 | |
| 2189 | if (t == NULL) |
| 2190 | { |
| 2191 | amt = sizeof *t; |
| 2192 | t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt); |
| 2193 | if (t == NULL) |
| 2194 | { |
| 2195 | rinfo->failed = TRUE; |
| 2196 | return FALSE; |
| 2197 | } |
| 2198 | |
| 2199 | t->vn_bfd = h->verinfo.verdef->vd_bfd; |
| 2200 | t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref; |
| 2201 | elf_tdata (rinfo->info->output_bfd)->verref = t; |
| 2202 | } |
| 2203 | |
| 2204 | amt = sizeof *a; |
| 2205 | a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt); |
| 2206 | if (a == NULL) |
| 2207 | { |
| 2208 | rinfo->failed = TRUE; |
| 2209 | return FALSE; |
| 2210 | } |
| 2211 | |
| 2212 | /* Note that we are copying a string pointer here, and testing it |
| 2213 | above. If bfd_elf_string_from_elf_section is ever changed to |
| 2214 | discard the string data when low in memory, this will have to be |
| 2215 | fixed. */ |
| 2216 | a->vna_nodename = h->verinfo.verdef->vd_nodename; |
| 2217 | |
| 2218 | a->vna_flags = h->verinfo.verdef->vd_flags; |
| 2219 | a->vna_nextptr = t->vn_auxptr; |
| 2220 | |
| 2221 | h->verinfo.verdef->vd_exp_refno = rinfo->vers; |
| 2222 | ++rinfo->vers; |
| 2223 | |
| 2224 | a->vna_other = h->verinfo.verdef->vd_exp_refno + 1; |
| 2225 | |
| 2226 | t->vn_auxptr = a; |
| 2227 | |
| 2228 | return TRUE; |
| 2229 | } |
| 2230 | |
| 2231 | /* Return TRUE and set *HIDE to TRUE if the versioned symbol is |
| 2232 | hidden. Set *T_P to NULL if there is no match. */ |
| 2233 | |
| 2234 | static bfd_boolean |
| 2235 | _bfd_elf_link_hide_versioned_symbol (struct bfd_link_info *info, |
| 2236 | struct elf_link_hash_entry *h, |
| 2237 | const char *version_p, |
| 2238 | struct bfd_elf_version_tree **t_p, |
| 2239 | bfd_boolean *hide) |
| 2240 | { |
| 2241 | struct bfd_elf_version_tree *t; |
| 2242 | |
| 2243 | /* Look for the version. If we find it, it is no longer weak. */ |
| 2244 | for (t = info->version_info; t != NULL; t = t->next) |
| 2245 | { |
| 2246 | if (strcmp (t->name, version_p) == 0) |
| 2247 | { |
| 2248 | size_t len; |
| 2249 | char *alc; |
| 2250 | struct bfd_elf_version_expr *d; |
| 2251 | |
| 2252 | len = version_p - h->root.root.string; |
| 2253 | alc = (char *) bfd_malloc (len); |
| 2254 | if (alc == NULL) |
| 2255 | return FALSE; |
| 2256 | memcpy (alc, h->root.root.string, len - 1); |
| 2257 | alc[len - 1] = '\0'; |
| 2258 | if (alc[len - 2] == ELF_VER_CHR) |
| 2259 | alc[len - 2] = '\0'; |
| 2260 | |
| 2261 | h->verinfo.vertree = t; |
| 2262 | t->used = TRUE; |
| 2263 | d = NULL; |
| 2264 | |
| 2265 | if (t->globals.list != NULL) |
| 2266 | d = (*t->match) (&t->globals, NULL, alc); |
| 2267 | |
| 2268 | /* See if there is anything to force this symbol to |
| 2269 | local scope. */ |
| 2270 | if (d == NULL && t->locals.list != NULL) |
| 2271 | { |
| 2272 | d = (*t->match) (&t->locals, NULL, alc); |
| 2273 | if (d != NULL |
| 2274 | && h->dynindx != -1 |
| 2275 | && ! info->export_dynamic) |
| 2276 | *hide = TRUE; |
| 2277 | } |
| 2278 | |
| 2279 | free (alc); |
| 2280 | break; |
| 2281 | } |
| 2282 | } |
| 2283 | |
| 2284 | *t_p = t; |
| 2285 | |
| 2286 | return TRUE; |
| 2287 | } |
| 2288 | |
| 2289 | /* Return TRUE if the symbol H is hidden by version script. */ |
| 2290 | |
| 2291 | bfd_boolean |
| 2292 | _bfd_elf_link_hide_sym_by_version (struct bfd_link_info *info, |
| 2293 | struct elf_link_hash_entry *h) |
| 2294 | { |
| 2295 | const char *p; |
| 2296 | bfd_boolean hide = FALSE; |
| 2297 | const struct elf_backend_data *bed |
| 2298 | = get_elf_backend_data (info->output_bfd); |
| 2299 | |
| 2300 | /* Version script only hides symbols defined in regular objects. */ |
| 2301 | if (!h->def_regular && !ELF_COMMON_DEF_P (h)) |
| 2302 | return TRUE; |
| 2303 | |
| 2304 | p = strchr (h->root.root.string, ELF_VER_CHR); |
| 2305 | if (p != NULL && h->verinfo.vertree == NULL) |
| 2306 | { |
| 2307 | struct bfd_elf_version_tree *t; |
| 2308 | |
| 2309 | ++p; |
| 2310 | if (*p == ELF_VER_CHR) |
| 2311 | ++p; |
| 2312 | |
| 2313 | if (*p != '\0' |
| 2314 | && _bfd_elf_link_hide_versioned_symbol (info, h, p, &t, &hide) |
| 2315 | && hide) |
| 2316 | { |
| 2317 | if (hide) |
| 2318 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 2319 | return TRUE; |
| 2320 | } |
| 2321 | } |
| 2322 | |
| 2323 | /* If we don't have a version for this symbol, see if we can find |
| 2324 | something. */ |
| 2325 | if (h->verinfo.vertree == NULL && info->version_info != NULL) |
| 2326 | { |
| 2327 | h->verinfo.vertree |
| 2328 | = bfd_find_version_for_sym (info->version_info, |
| 2329 | h->root.root.string, &hide); |
| 2330 | if (h->verinfo.vertree != NULL && hide) |
| 2331 | { |
| 2332 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 2333 | return TRUE; |
| 2334 | } |
| 2335 | } |
| 2336 | |
| 2337 | return FALSE; |
| 2338 | } |
| 2339 | |
| 2340 | /* Figure out appropriate versions for all the symbols. We may not |
| 2341 | have the version number script until we have read all of the input |
| 2342 | files, so until that point we don't know which symbols should be |
| 2343 | local. This function is called via elf_link_hash_traverse. */ |
| 2344 | |
| 2345 | static bfd_boolean |
| 2346 | _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data) |
| 2347 | { |
| 2348 | struct elf_info_failed *sinfo; |
| 2349 | struct bfd_link_info *info; |
| 2350 | const struct elf_backend_data *bed; |
| 2351 | struct elf_info_failed eif; |
| 2352 | char *p; |
| 2353 | bfd_boolean hide; |
| 2354 | |
| 2355 | sinfo = (struct elf_info_failed *) data; |
| 2356 | info = sinfo->info; |
| 2357 | |
| 2358 | /* Fix the symbol flags. */ |
| 2359 | eif.failed = FALSE; |
| 2360 | eif.info = info; |
| 2361 | if (! _bfd_elf_fix_symbol_flags (h, &eif)) |
| 2362 | { |
| 2363 | if (eif.failed) |
| 2364 | sinfo->failed = TRUE; |
| 2365 | return FALSE; |
| 2366 | } |
| 2367 | |
| 2368 | bed = get_elf_backend_data (info->output_bfd); |
| 2369 | |
| 2370 | /* We only need version numbers for symbols defined in regular |
| 2371 | objects. */ |
| 2372 | if (!h->def_regular) |
| 2373 | { |
| 2374 | /* Hide symbols defined in discarded input sections. */ |
| 2375 | if ((h->root.type == bfd_link_hash_defined |
| 2376 | || h->root.type == bfd_link_hash_defweak) |
| 2377 | && discarded_section (h->root.u.def.section)) |
| 2378 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 2379 | return TRUE; |
| 2380 | } |
| 2381 | |
| 2382 | hide = FALSE; |
| 2383 | p = strchr (h->root.root.string, ELF_VER_CHR); |
| 2384 | if (p != NULL && h->verinfo.vertree == NULL) |
| 2385 | { |
| 2386 | struct bfd_elf_version_tree *t; |
| 2387 | |
| 2388 | ++p; |
| 2389 | if (*p == ELF_VER_CHR) |
| 2390 | ++p; |
| 2391 | |
| 2392 | /* If there is no version string, we can just return out. */ |
| 2393 | if (*p == '\0') |
| 2394 | return TRUE; |
| 2395 | |
| 2396 | if (!_bfd_elf_link_hide_versioned_symbol (info, h, p, &t, &hide)) |
| 2397 | { |
| 2398 | sinfo->failed = TRUE; |
| 2399 | return FALSE; |
| 2400 | } |
| 2401 | |
| 2402 | if (hide) |
| 2403 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 2404 | |
| 2405 | /* If we are building an application, we need to create a |
| 2406 | version node for this version. */ |
| 2407 | if (t == NULL && bfd_link_executable (info)) |
| 2408 | { |
| 2409 | struct bfd_elf_version_tree **pp; |
| 2410 | int version_index; |
| 2411 | |
| 2412 | /* If we aren't going to export this symbol, we don't need |
| 2413 | to worry about it. */ |
| 2414 | if (h->dynindx == -1) |
| 2415 | return TRUE; |
| 2416 | |
| 2417 | t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, |
| 2418 | sizeof *t); |
| 2419 | if (t == NULL) |
| 2420 | { |
| 2421 | sinfo->failed = TRUE; |
| 2422 | return FALSE; |
| 2423 | } |
| 2424 | |
| 2425 | t->name = p; |
| 2426 | t->name_indx = (unsigned int) -1; |
| 2427 | t->used = TRUE; |
| 2428 | |
| 2429 | version_index = 1; |
| 2430 | /* Don't count anonymous version tag. */ |
| 2431 | if (sinfo->info->version_info != NULL |
| 2432 | && sinfo->info->version_info->vernum == 0) |
| 2433 | version_index = 0; |
| 2434 | for (pp = &sinfo->info->version_info; |
| 2435 | *pp != NULL; |
| 2436 | pp = &(*pp)->next) |
| 2437 | ++version_index; |
| 2438 | t->vernum = version_index; |
| 2439 | |
| 2440 | *pp = t; |
| 2441 | |
| 2442 | h->verinfo.vertree = t; |
| 2443 | } |
| 2444 | else if (t == NULL) |
| 2445 | { |
| 2446 | /* We could not find the version for a symbol when |
| 2447 | generating a shared archive. Return an error. */ |
| 2448 | _bfd_error_handler |
| 2449 | /* xgettext:c-format */ |
| 2450 | (_("%pB: version node not found for symbol %s"), |
| 2451 | info->output_bfd, h->root.root.string); |
| 2452 | bfd_set_error (bfd_error_bad_value); |
| 2453 | sinfo->failed = TRUE; |
| 2454 | return FALSE; |
| 2455 | } |
| 2456 | } |
| 2457 | |
| 2458 | /* If we don't have a version for this symbol, see if we can find |
| 2459 | something. */ |
| 2460 | if (!hide |
| 2461 | && h->verinfo.vertree == NULL |
| 2462 | && sinfo->info->version_info != NULL) |
| 2463 | { |
| 2464 | h->verinfo.vertree |
| 2465 | = bfd_find_version_for_sym (sinfo->info->version_info, |
| 2466 | h->root.root.string, &hide); |
| 2467 | if (h->verinfo.vertree != NULL && hide) |
| 2468 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 2469 | } |
| 2470 | |
| 2471 | return TRUE; |
| 2472 | } |
| 2473 | \f |
| 2474 | /* Read and swap the relocs from the section indicated by SHDR. This |
| 2475 | may be either a REL or a RELA section. The relocations are |
| 2476 | translated into RELA relocations and stored in INTERNAL_RELOCS, |
| 2477 | which should have already been allocated to contain enough space. |
| 2478 | The EXTERNAL_RELOCS are a buffer where the external form of the |
| 2479 | relocations should be stored. |
| 2480 | |
| 2481 | Returns FALSE if something goes wrong. */ |
| 2482 | |
| 2483 | static bfd_boolean |
| 2484 | elf_link_read_relocs_from_section (bfd *abfd, |
| 2485 | asection *sec, |
| 2486 | Elf_Internal_Shdr *shdr, |
| 2487 | void *external_relocs, |
| 2488 | Elf_Internal_Rela *internal_relocs) |
| 2489 | { |
| 2490 | const struct elf_backend_data *bed; |
| 2491 | void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *); |
| 2492 | const bfd_byte *erela; |
| 2493 | const bfd_byte *erelaend; |
| 2494 | Elf_Internal_Rela *irela; |
| 2495 | Elf_Internal_Shdr *symtab_hdr; |
| 2496 | size_t nsyms; |
| 2497 | |
| 2498 | /* Position ourselves at the start of the section. */ |
| 2499 | if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0) |
| 2500 | return FALSE; |
| 2501 | |
| 2502 | /* Read the relocations. */ |
| 2503 | if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size) |
| 2504 | return FALSE; |
| 2505 | |
| 2506 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2507 | nsyms = NUM_SHDR_ENTRIES (symtab_hdr); |
| 2508 | |
| 2509 | bed = get_elf_backend_data (abfd); |
| 2510 | |
| 2511 | /* Convert the external relocations to the internal format. */ |
| 2512 | if (shdr->sh_entsize == bed->s->sizeof_rel) |
| 2513 | swap_in = bed->s->swap_reloc_in; |
| 2514 | else if (shdr->sh_entsize == bed->s->sizeof_rela) |
| 2515 | swap_in = bed->s->swap_reloca_in; |
| 2516 | else |
| 2517 | { |
| 2518 | bfd_set_error (bfd_error_wrong_format); |
| 2519 | return FALSE; |
| 2520 | } |
| 2521 | |
| 2522 | erela = (const bfd_byte *) external_relocs; |
| 2523 | /* Setting erelaend like this and comparing with <= handles case of |
| 2524 | a fuzzed object with sh_size not a multiple of sh_entsize. */ |
| 2525 | erelaend = erela + shdr->sh_size - shdr->sh_entsize; |
| 2526 | irela = internal_relocs; |
| 2527 | while (erela <= erelaend) |
| 2528 | { |
| 2529 | bfd_vma r_symndx; |
| 2530 | |
| 2531 | (*swap_in) (abfd, erela, irela); |
| 2532 | r_symndx = ELF32_R_SYM (irela->r_info); |
| 2533 | if (bed->s->arch_size == 64) |
| 2534 | r_symndx >>= 24; |
| 2535 | if (nsyms > 0) |
| 2536 | { |
| 2537 | if ((size_t) r_symndx >= nsyms) |
| 2538 | { |
| 2539 | _bfd_error_handler |
| 2540 | /* xgettext:c-format */ |
| 2541 | (_("%pB: bad reloc symbol index (%#" PRIx64 " >= %#lx)" |
| 2542 | " for offset %#" PRIx64 " in section `%pA'"), |
| 2543 | abfd, (uint64_t) r_symndx, (unsigned long) nsyms, |
| 2544 | (uint64_t) irela->r_offset, sec); |
| 2545 | bfd_set_error (bfd_error_bad_value); |
| 2546 | return FALSE; |
| 2547 | } |
| 2548 | } |
| 2549 | else if (r_symndx != STN_UNDEF) |
| 2550 | { |
| 2551 | _bfd_error_handler |
| 2552 | /* xgettext:c-format */ |
| 2553 | (_("%pB: non-zero symbol index (%#" PRIx64 ")" |
| 2554 | " for offset %#" PRIx64 " in section `%pA'" |
| 2555 | " when the object file has no symbol table"), |
| 2556 | abfd, (uint64_t) r_symndx, |
| 2557 | (uint64_t) irela->r_offset, sec); |
| 2558 | bfd_set_error (bfd_error_bad_value); |
| 2559 | return FALSE; |
| 2560 | } |
| 2561 | irela += bed->s->int_rels_per_ext_rel; |
| 2562 | erela += shdr->sh_entsize; |
| 2563 | } |
| 2564 | |
| 2565 | return TRUE; |
| 2566 | } |
| 2567 | |
| 2568 | /* Read and swap the relocs for a section O. They may have been |
| 2569 | cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are |
| 2570 | not NULL, they are used as buffers to read into. They are known to |
| 2571 | be large enough. If the INTERNAL_RELOCS relocs argument is NULL, |
| 2572 | the return value is allocated using either malloc or bfd_alloc, |
| 2573 | according to the KEEP_MEMORY argument. If O has two relocation |
| 2574 | sections (both REL and RELA relocations), then the REL_HDR |
| 2575 | relocations will appear first in INTERNAL_RELOCS, followed by the |
| 2576 | RELA_HDR relocations. */ |
| 2577 | |
| 2578 | Elf_Internal_Rela * |
| 2579 | _bfd_elf_link_read_relocs (bfd *abfd, |
| 2580 | asection *o, |
| 2581 | void *external_relocs, |
| 2582 | Elf_Internal_Rela *internal_relocs, |
| 2583 | bfd_boolean keep_memory) |
| 2584 | { |
| 2585 | void *alloc1 = NULL; |
| 2586 | Elf_Internal_Rela *alloc2 = NULL; |
| 2587 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 2588 | struct bfd_elf_section_data *esdo = elf_section_data (o); |
| 2589 | Elf_Internal_Rela *internal_rela_relocs; |
| 2590 | |
| 2591 | if (esdo->relocs != NULL) |
| 2592 | return esdo->relocs; |
| 2593 | |
| 2594 | if (o->reloc_count == 0) |
| 2595 | return NULL; |
| 2596 | |
| 2597 | if (internal_relocs == NULL) |
| 2598 | { |
| 2599 | bfd_size_type size; |
| 2600 | |
| 2601 | size = (bfd_size_type) o->reloc_count * sizeof (Elf_Internal_Rela); |
| 2602 | if (keep_memory) |
| 2603 | internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size); |
| 2604 | else |
| 2605 | internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size); |
| 2606 | if (internal_relocs == NULL) |
| 2607 | goto error_return; |
| 2608 | } |
| 2609 | |
| 2610 | if (external_relocs == NULL) |
| 2611 | { |
| 2612 | bfd_size_type size = 0; |
| 2613 | |
| 2614 | if (esdo->rel.hdr) |
| 2615 | size += esdo->rel.hdr->sh_size; |
| 2616 | if (esdo->rela.hdr) |
| 2617 | size += esdo->rela.hdr->sh_size; |
| 2618 | |
| 2619 | alloc1 = bfd_malloc (size); |
| 2620 | if (alloc1 == NULL) |
| 2621 | goto error_return; |
| 2622 | external_relocs = alloc1; |
| 2623 | } |
| 2624 | |
| 2625 | internal_rela_relocs = internal_relocs; |
| 2626 | if (esdo->rel.hdr) |
| 2627 | { |
| 2628 | if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr, |
| 2629 | external_relocs, |
| 2630 | internal_relocs)) |
| 2631 | goto error_return; |
| 2632 | external_relocs = (((bfd_byte *) external_relocs) |
| 2633 | + esdo->rel.hdr->sh_size); |
| 2634 | internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr) |
| 2635 | * bed->s->int_rels_per_ext_rel); |
| 2636 | } |
| 2637 | |
| 2638 | if (esdo->rela.hdr |
| 2639 | && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr, |
| 2640 | external_relocs, |
| 2641 | internal_rela_relocs))) |
| 2642 | goto error_return; |
| 2643 | |
| 2644 | /* Cache the results for next time, if we can. */ |
| 2645 | if (keep_memory) |
| 2646 | esdo->relocs = internal_relocs; |
| 2647 | |
| 2648 | if (alloc1 != NULL) |
| 2649 | free (alloc1); |
| 2650 | |
| 2651 | /* Don't free alloc2, since if it was allocated we are passing it |
| 2652 | back (under the name of internal_relocs). */ |
| 2653 | |
| 2654 | return internal_relocs; |
| 2655 | |
| 2656 | error_return: |
| 2657 | if (alloc1 != NULL) |
| 2658 | free (alloc1); |
| 2659 | if (alloc2 != NULL) |
| 2660 | { |
| 2661 | if (keep_memory) |
| 2662 | bfd_release (abfd, alloc2); |
| 2663 | else |
| 2664 | free (alloc2); |
| 2665 | } |
| 2666 | return NULL; |
| 2667 | } |
| 2668 | |
| 2669 | /* Compute the size of, and allocate space for, REL_HDR which is the |
| 2670 | section header for a section containing relocations for O. */ |
| 2671 | |
| 2672 | static bfd_boolean |
| 2673 | _bfd_elf_link_size_reloc_section (bfd *abfd, |
| 2674 | struct bfd_elf_section_reloc_data *reldata) |
| 2675 | { |
| 2676 | Elf_Internal_Shdr *rel_hdr = reldata->hdr; |
| 2677 | |
| 2678 | /* That allows us to calculate the size of the section. */ |
| 2679 | rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count; |
| 2680 | |
| 2681 | /* The contents field must last into write_object_contents, so we |
| 2682 | allocate it with bfd_alloc rather than malloc. Also since we |
| 2683 | cannot be sure that the contents will actually be filled in, |
| 2684 | we zero the allocated space. */ |
| 2685 | rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size); |
| 2686 | if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0) |
| 2687 | return FALSE; |
| 2688 | |
| 2689 | if (reldata->hashes == NULL && reldata->count) |
| 2690 | { |
| 2691 | struct elf_link_hash_entry **p; |
| 2692 | |
| 2693 | p = ((struct elf_link_hash_entry **) |
| 2694 | bfd_zmalloc (reldata->count * sizeof (*p))); |
| 2695 | if (p == NULL) |
| 2696 | return FALSE; |
| 2697 | |
| 2698 | reldata->hashes = p; |
| 2699 | } |
| 2700 | |
| 2701 | return TRUE; |
| 2702 | } |
| 2703 | |
| 2704 | /* Copy the relocations indicated by the INTERNAL_RELOCS (which |
| 2705 | originated from the section given by INPUT_REL_HDR) to the |
| 2706 | OUTPUT_BFD. */ |
| 2707 | |
| 2708 | bfd_boolean |
| 2709 | _bfd_elf_link_output_relocs (bfd *output_bfd, |
| 2710 | asection *input_section, |
| 2711 | Elf_Internal_Shdr *input_rel_hdr, |
| 2712 | Elf_Internal_Rela *internal_relocs, |
| 2713 | struct elf_link_hash_entry **rel_hash |
| 2714 | ATTRIBUTE_UNUSED) |
| 2715 | { |
| 2716 | Elf_Internal_Rela *irela; |
| 2717 | Elf_Internal_Rela *irelaend; |
| 2718 | bfd_byte *erel; |
| 2719 | struct bfd_elf_section_reloc_data *output_reldata; |
| 2720 | asection *output_section; |
| 2721 | const struct elf_backend_data *bed; |
| 2722 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
| 2723 | struct bfd_elf_section_data *esdo; |
| 2724 | |
| 2725 | output_section = input_section->output_section; |
| 2726 | |
| 2727 | bed = get_elf_backend_data (output_bfd); |
| 2728 | esdo = elf_section_data (output_section); |
| 2729 | if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize) |
| 2730 | { |
| 2731 | output_reldata = &esdo->rel; |
| 2732 | swap_out = bed->s->swap_reloc_out; |
| 2733 | } |
| 2734 | else if (esdo->rela.hdr |
| 2735 | && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize) |
| 2736 | { |
| 2737 | output_reldata = &esdo->rela; |
| 2738 | swap_out = bed->s->swap_reloca_out; |
| 2739 | } |
| 2740 | else |
| 2741 | { |
| 2742 | _bfd_error_handler |
| 2743 | /* xgettext:c-format */ |
| 2744 | (_("%pB: relocation size mismatch in %pB section %pA"), |
| 2745 | output_bfd, input_section->owner, input_section); |
| 2746 | bfd_set_error (bfd_error_wrong_format); |
| 2747 | return FALSE; |
| 2748 | } |
| 2749 | |
| 2750 | erel = output_reldata->hdr->contents; |
| 2751 | erel += output_reldata->count * input_rel_hdr->sh_entsize; |
| 2752 | irela = internal_relocs; |
| 2753 | irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr) |
| 2754 | * bed->s->int_rels_per_ext_rel); |
| 2755 | while (irela < irelaend) |
| 2756 | { |
| 2757 | (*swap_out) (output_bfd, irela, erel); |
| 2758 | irela += bed->s->int_rels_per_ext_rel; |
| 2759 | erel += input_rel_hdr->sh_entsize; |
| 2760 | } |
| 2761 | |
| 2762 | /* Bump the counter, so that we know where to add the next set of |
| 2763 | relocations. */ |
| 2764 | output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr); |
| 2765 | |
| 2766 | return TRUE; |
| 2767 | } |
| 2768 | \f |
| 2769 | /* Make weak undefined symbols in PIE dynamic. */ |
| 2770 | |
| 2771 | bfd_boolean |
| 2772 | _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info, |
| 2773 | struct elf_link_hash_entry *h) |
| 2774 | { |
| 2775 | if (bfd_link_pie (info) |
| 2776 | && h->dynindx == -1 |
| 2777 | && h->root.type == bfd_link_hash_undefweak) |
| 2778 | return bfd_elf_link_record_dynamic_symbol (info, h); |
| 2779 | |
| 2780 | return TRUE; |
| 2781 | } |
| 2782 | |
| 2783 | /* Fix up the flags for a symbol. This handles various cases which |
| 2784 | can only be fixed after all the input files are seen. This is |
| 2785 | currently called by both adjust_dynamic_symbol and |
| 2786 | assign_sym_version, which is unnecessary but perhaps more robust in |
| 2787 | the face of future changes. */ |
| 2788 | |
| 2789 | static bfd_boolean |
| 2790 | _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h, |
| 2791 | struct elf_info_failed *eif) |
| 2792 | { |
| 2793 | const struct elf_backend_data *bed; |
| 2794 | |
| 2795 | /* If this symbol was mentioned in a non-ELF file, try to set |
| 2796 | DEF_REGULAR and REF_REGULAR correctly. This is the only way to |
| 2797 | permit a non-ELF file to correctly refer to a symbol defined in |
| 2798 | an ELF dynamic object. */ |
| 2799 | if (h->non_elf) |
| 2800 | { |
| 2801 | while (h->root.type == bfd_link_hash_indirect) |
| 2802 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2803 | |
| 2804 | if (h->root.type != bfd_link_hash_defined |
| 2805 | && h->root.type != bfd_link_hash_defweak) |
| 2806 | { |
| 2807 | h->ref_regular = 1; |
| 2808 | h->ref_regular_nonweak = 1; |
| 2809 | } |
| 2810 | else |
| 2811 | { |
| 2812 | if (h->root.u.def.section->owner != NULL |
| 2813 | && (bfd_get_flavour (h->root.u.def.section->owner) |
| 2814 | == bfd_target_elf_flavour)) |
| 2815 | { |
| 2816 | h->ref_regular = 1; |
| 2817 | h->ref_regular_nonweak = 1; |
| 2818 | } |
| 2819 | else |
| 2820 | h->def_regular = 1; |
| 2821 | } |
| 2822 | |
| 2823 | if (h->dynindx == -1 |
| 2824 | && (h->def_dynamic |
| 2825 | || h->ref_dynamic)) |
| 2826 | { |
| 2827 | if (! bfd_elf_link_record_dynamic_symbol (eif->info, h)) |
| 2828 | { |
| 2829 | eif->failed = TRUE; |
| 2830 | return FALSE; |
| 2831 | } |
| 2832 | } |
| 2833 | } |
| 2834 | else |
| 2835 | { |
| 2836 | /* Unfortunately, NON_ELF is only correct if the symbol |
| 2837 | was first seen in a non-ELF file. Fortunately, if the symbol |
| 2838 | was first seen in an ELF file, we're probably OK unless the |
| 2839 | symbol was defined in a non-ELF file. Catch that case here. |
| 2840 | FIXME: We're still in trouble if the symbol was first seen in |
| 2841 | a dynamic object, and then later in a non-ELF regular object. */ |
| 2842 | if ((h->root.type == bfd_link_hash_defined |
| 2843 | || h->root.type == bfd_link_hash_defweak) |
| 2844 | && !h->def_regular |
| 2845 | && (h->root.u.def.section->owner != NULL |
| 2846 | ? (bfd_get_flavour (h->root.u.def.section->owner) |
| 2847 | != bfd_target_elf_flavour) |
| 2848 | : (bfd_is_abs_section (h->root.u.def.section) |
| 2849 | && !h->def_dynamic))) |
| 2850 | h->def_regular = 1; |
| 2851 | } |
| 2852 | |
| 2853 | /* Backend specific symbol fixup. */ |
| 2854 | bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj); |
| 2855 | if (bed->elf_backend_fixup_symbol |
| 2856 | && !(*bed->elf_backend_fixup_symbol) (eif->info, h)) |
| 2857 | return FALSE; |
| 2858 | |
| 2859 | /* If this is a final link, and the symbol was defined as a common |
| 2860 | symbol in a regular object file, and there was no definition in |
| 2861 | any dynamic object, then the linker will have allocated space for |
| 2862 | the symbol in a common section but the DEF_REGULAR |
| 2863 | flag will not have been set. */ |
| 2864 | if (h->root.type == bfd_link_hash_defined |
| 2865 | && !h->def_regular |
| 2866 | && h->ref_regular |
| 2867 | && !h->def_dynamic |
| 2868 | && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0) |
| 2869 | h->def_regular = 1; |
| 2870 | |
| 2871 | /* Symbols defined in discarded sections shouldn't be dynamic. */ |
| 2872 | if (h->root.type == bfd_link_hash_undefined && h->indx == -3) |
| 2873 | (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE); |
| 2874 | |
| 2875 | /* If a weak undefined symbol has non-default visibility, we also |
| 2876 | hide it from the dynamic linker. */ |
| 2877 | else if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 2878 | && h->root.type == bfd_link_hash_undefweak) |
| 2879 | (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE); |
| 2880 | |
| 2881 | /* A hidden versioned symbol in executable should be forced local if |
| 2882 | it is is locally defined, not referenced by shared library and not |
| 2883 | exported. */ |
| 2884 | else if (bfd_link_executable (eif->info) |
| 2885 | && h->versioned == versioned_hidden |
| 2886 | && !eif->info->export_dynamic |
| 2887 | && !h->dynamic |
| 2888 | && !h->ref_dynamic |
| 2889 | && h->def_regular) |
| 2890 | (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE); |
| 2891 | |
| 2892 | /* If -Bsymbolic was used (which means to bind references to global |
| 2893 | symbols to the definition within the shared object), and this |
| 2894 | symbol was defined in a regular object, then it actually doesn't |
| 2895 | need a PLT entry. Likewise, if the symbol has non-default |
| 2896 | visibility. If the symbol has hidden or internal visibility, we |
| 2897 | will force it local. */ |
| 2898 | else if (h->needs_plt |
| 2899 | && bfd_link_pic (eif->info) |
| 2900 | && is_elf_hash_table (eif->info->hash) |
| 2901 | && (SYMBOLIC_BIND (eif->info, h) |
| 2902 | || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 2903 | && h->def_regular) |
| 2904 | { |
| 2905 | bfd_boolean force_local; |
| 2906 | |
| 2907 | force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL |
| 2908 | || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN); |
| 2909 | (*bed->elf_backend_hide_symbol) (eif->info, h, force_local); |
| 2910 | } |
| 2911 | |
| 2912 | /* If this is a weak defined symbol in a dynamic object, and we know |
| 2913 | the real definition in the dynamic object, copy interesting flags |
| 2914 | over to the real definition. */ |
| 2915 | if (h->is_weakalias) |
| 2916 | { |
| 2917 | struct elf_link_hash_entry *def = weakdef (h); |
| 2918 | |
| 2919 | /* If the real definition is defined by a regular object file, |
| 2920 | don't do anything special. See the longer description in |
| 2921 | _bfd_elf_adjust_dynamic_symbol, below. If the def is not |
| 2922 | bfd_link_hash_defined as it was when put on the alias list |
| 2923 | then it must have originally been a versioned symbol (for |
| 2924 | which a non-versioned indirect symbol is created) and later |
| 2925 | a definition for the non-versioned symbol is found. In that |
| 2926 | case the indirection is flipped with the versioned symbol |
| 2927 | becoming an indirect pointing at the non-versioned symbol. |
| 2928 | Thus, not an alias any more. */ |
| 2929 | if (def->def_regular |
| 2930 | || def->root.type != bfd_link_hash_defined) |
| 2931 | { |
| 2932 | h = def; |
| 2933 | while ((h = h->u.alias) != def) |
| 2934 | h->is_weakalias = 0; |
| 2935 | } |
| 2936 | else |
| 2937 | { |
| 2938 | while (h->root.type == bfd_link_hash_indirect) |
| 2939 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2940 | BFD_ASSERT (h->root.type == bfd_link_hash_defined |
| 2941 | || h->root.type == bfd_link_hash_defweak); |
| 2942 | BFD_ASSERT (def->def_dynamic); |
| 2943 | (*bed->elf_backend_copy_indirect_symbol) (eif->info, def, h); |
| 2944 | } |
| 2945 | } |
| 2946 | |
| 2947 | return TRUE; |
| 2948 | } |
| 2949 | |
| 2950 | /* Make the backend pick a good value for a dynamic symbol. This is |
| 2951 | called via elf_link_hash_traverse, and also calls itself |
| 2952 | recursively. */ |
| 2953 | |
| 2954 | static bfd_boolean |
| 2955 | _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data) |
| 2956 | { |
| 2957 | struct elf_info_failed *eif = (struct elf_info_failed *) data; |
| 2958 | struct elf_link_hash_table *htab; |
| 2959 | const struct elf_backend_data *bed; |
| 2960 | |
| 2961 | if (! is_elf_hash_table (eif->info->hash)) |
| 2962 | return FALSE; |
| 2963 | |
| 2964 | /* Ignore indirect symbols. These are added by the versioning code. */ |
| 2965 | if (h->root.type == bfd_link_hash_indirect) |
| 2966 | return TRUE; |
| 2967 | |
| 2968 | /* Fix the symbol flags. */ |
| 2969 | if (! _bfd_elf_fix_symbol_flags (h, eif)) |
| 2970 | return FALSE; |
| 2971 | |
| 2972 | htab = elf_hash_table (eif->info); |
| 2973 | bed = get_elf_backend_data (htab->dynobj); |
| 2974 | |
| 2975 | if (h->root.type == bfd_link_hash_undefweak) |
| 2976 | { |
| 2977 | if (eif->info->dynamic_undefined_weak == 0) |
| 2978 | (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE); |
| 2979 | else if (eif->info->dynamic_undefined_weak > 0 |
| 2980 | && h->ref_regular |
| 2981 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2982 | && !bfd_hide_sym_by_version (eif->info->version_info, |
| 2983 | h->root.root.string)) |
| 2984 | { |
| 2985 | if (!bfd_elf_link_record_dynamic_symbol (eif->info, h)) |
| 2986 | { |
| 2987 | eif->failed = TRUE; |
| 2988 | return FALSE; |
| 2989 | } |
| 2990 | } |
| 2991 | } |
| 2992 | |
| 2993 | /* If this symbol does not require a PLT entry, and it is not |
| 2994 | defined by a dynamic object, or is not referenced by a regular |
| 2995 | object, ignore it. We do have to handle a weak defined symbol, |
| 2996 | even if no regular object refers to it, if we decided to add it |
| 2997 | to the dynamic symbol table. FIXME: Do we normally need to worry |
| 2998 | about symbols which are defined by one dynamic object and |
| 2999 | referenced by another one? */ |
| 3000 | if (!h->needs_plt |
| 3001 | && h->type != STT_GNU_IFUNC |
| 3002 | && (h->def_regular |
| 3003 | || !h->def_dynamic |
| 3004 | || (!h->ref_regular |
| 3005 | && (!h->is_weakalias || weakdef (h)->dynindx == -1)))) |
| 3006 | { |
| 3007 | h->plt = elf_hash_table (eif->info)->init_plt_offset; |
| 3008 | return TRUE; |
| 3009 | } |
| 3010 | |
| 3011 | /* If we've already adjusted this symbol, don't do it again. This |
| 3012 | can happen via a recursive call. */ |
| 3013 | if (h->dynamic_adjusted) |
| 3014 | return TRUE; |
| 3015 | |
| 3016 | /* Don't look at this symbol again. Note that we must set this |
| 3017 | after checking the above conditions, because we may look at a |
| 3018 | symbol once, decide not to do anything, and then get called |
| 3019 | recursively later after REF_REGULAR is set below. */ |
| 3020 | h->dynamic_adjusted = 1; |
| 3021 | |
| 3022 | /* If this is a weak definition, and we know a real definition, and |
| 3023 | the real symbol is not itself defined by a regular object file, |
| 3024 | then get a good value for the real definition. We handle the |
| 3025 | real symbol first, for the convenience of the backend routine. |
| 3026 | |
| 3027 | Note that there is a confusing case here. If the real definition |
| 3028 | is defined by a regular object file, we don't get the real symbol |
| 3029 | from the dynamic object, but we do get the weak symbol. If the |
| 3030 | processor backend uses a COPY reloc, then if some routine in the |
| 3031 | dynamic object changes the real symbol, we will not see that |
| 3032 | change in the corresponding weak symbol. This is the way other |
| 3033 | ELF linkers work as well, and seems to be a result of the shared |
| 3034 | library model. |
| 3035 | |
| 3036 | I will clarify this issue. Most SVR4 shared libraries define the |
| 3037 | variable _timezone and define timezone as a weak synonym. The |
| 3038 | tzset call changes _timezone. If you write |
| 3039 | extern int timezone; |
| 3040 | int _timezone = 5; |
| 3041 | int main () { tzset (); printf ("%d %d\n", timezone, _timezone); } |
| 3042 | you might expect that, since timezone is a synonym for _timezone, |
| 3043 | the same number will print both times. However, if the processor |
| 3044 | backend uses a COPY reloc, then actually timezone will be copied |
| 3045 | into your process image, and, since you define _timezone |
| 3046 | yourself, _timezone will not. Thus timezone and _timezone will |
| 3047 | wind up at different memory locations. The tzset call will set |
| 3048 | _timezone, leaving timezone unchanged. */ |
| 3049 | |
| 3050 | if (h->is_weakalias) |
| 3051 | { |
| 3052 | struct elf_link_hash_entry *def = weakdef (h); |
| 3053 | |
| 3054 | /* If we get to this point, there is an implicit reference to |
| 3055 | the alias by a regular object file via the weak symbol H. */ |
| 3056 | def->ref_regular = 1; |
| 3057 | |
| 3058 | /* Ensure that the backend adjust_dynamic_symbol function sees |
| 3059 | the strong alias before H by recursively calling ourselves. */ |
| 3060 | if (!_bfd_elf_adjust_dynamic_symbol (def, eif)) |
| 3061 | return FALSE; |
| 3062 | } |
| 3063 | |
| 3064 | /* If a symbol has no type and no size and does not require a PLT |
| 3065 | entry, then we are probably about to do the wrong thing here: we |
| 3066 | are probably going to create a COPY reloc for an empty object. |
| 3067 | This case can arise when a shared object is built with assembly |
| 3068 | code, and the assembly code fails to set the symbol type. */ |
| 3069 | if (h->size == 0 |
| 3070 | && h->type == STT_NOTYPE |
| 3071 | && !h->needs_plt) |
| 3072 | _bfd_error_handler |
| 3073 | (_("warning: type and size of dynamic symbol `%s' are not defined"), |
| 3074 | h->root.root.string); |
| 3075 | |
| 3076 | if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h)) |
| 3077 | { |
| 3078 | eif->failed = TRUE; |
| 3079 | return FALSE; |
| 3080 | } |
| 3081 | |
| 3082 | return TRUE; |
| 3083 | } |
| 3084 | |
| 3085 | /* Adjust the dynamic symbol, H, for copy in the dynamic bss section, |
| 3086 | DYNBSS. */ |
| 3087 | |
| 3088 | bfd_boolean |
| 3089 | _bfd_elf_adjust_dynamic_copy (struct bfd_link_info *info, |
| 3090 | struct elf_link_hash_entry *h, |
| 3091 | asection *dynbss) |
| 3092 | { |
| 3093 | unsigned int power_of_two; |
| 3094 | bfd_vma mask; |
| 3095 | asection *sec = h->root.u.def.section; |
| 3096 | |
| 3097 | /* The section alignment of the definition is the maximum alignment |
| 3098 | requirement of symbols defined in the section. Since we don't |
| 3099 | know the symbol alignment requirement, we start with the |
| 3100 | maximum alignment and check low bits of the symbol address |
| 3101 | for the minimum alignment. */ |
| 3102 | power_of_two = bfd_get_section_alignment (sec->owner, sec); |
| 3103 | mask = ((bfd_vma) 1 << power_of_two) - 1; |
| 3104 | while ((h->root.u.def.value & mask) != 0) |
| 3105 | { |
| 3106 | mask >>= 1; |
| 3107 | --power_of_two; |
| 3108 | } |
| 3109 | |
| 3110 | if (power_of_two > bfd_get_section_alignment (dynbss->owner, |
| 3111 | dynbss)) |
| 3112 | { |
| 3113 | /* Adjust the section alignment if needed. */ |
| 3114 | if (! bfd_set_section_alignment (dynbss->owner, dynbss, |
| 3115 | power_of_two)) |
| 3116 | return FALSE; |
| 3117 | } |
| 3118 | |
| 3119 | /* We make sure that the symbol will be aligned properly. */ |
| 3120 | dynbss->size = BFD_ALIGN (dynbss->size, mask + 1); |
| 3121 | |
| 3122 | /* Define the symbol as being at this point in DYNBSS. */ |
| 3123 | h->root.u.def.section = dynbss; |
| 3124 | h->root.u.def.value = dynbss->size; |
| 3125 | |
| 3126 | /* Increment the size of DYNBSS to make room for the symbol. */ |
| 3127 | dynbss->size += h->size; |
| 3128 | |
| 3129 | /* No error if extern_protected_data is true. */ |
| 3130 | if (h->protected_def |
| 3131 | && (!info->extern_protected_data |
| 3132 | || (info->extern_protected_data < 0 |
| 3133 | && !get_elf_backend_data (dynbss->owner)->extern_protected_data))) |
| 3134 | info->callbacks->einfo |
| 3135 | (_("%P: copy reloc against protected `%pT' is dangerous\n"), |
| 3136 | h->root.root.string); |
| 3137 | |
| 3138 | return TRUE; |
| 3139 | } |
| 3140 | |
| 3141 | /* Adjust all external symbols pointing into SEC_MERGE sections |
| 3142 | to reflect the object merging within the sections. */ |
| 3143 | |
| 3144 | static bfd_boolean |
| 3145 | _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data) |
| 3146 | { |
| 3147 | asection *sec; |
| 3148 | |
| 3149 | if ((h->root.type == bfd_link_hash_defined |
| 3150 | || h->root.type == bfd_link_hash_defweak) |
| 3151 | && ((sec = h->root.u.def.section)->flags & SEC_MERGE) |
| 3152 | && sec->sec_info_type == SEC_INFO_TYPE_MERGE) |
| 3153 | { |
| 3154 | bfd *output_bfd = (bfd *) data; |
| 3155 | |
| 3156 | h->root.u.def.value = |
| 3157 | _bfd_merged_section_offset (output_bfd, |
| 3158 | &h->root.u.def.section, |
| 3159 | elf_section_data (sec)->sec_info, |
| 3160 | h->root.u.def.value); |
| 3161 | } |
| 3162 | |
| 3163 | return TRUE; |
| 3164 | } |
| 3165 | |
| 3166 | /* Returns false if the symbol referred to by H should be considered |
| 3167 | to resolve local to the current module, and true if it should be |
| 3168 | considered to bind dynamically. */ |
| 3169 | |
| 3170 | bfd_boolean |
| 3171 | _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h, |
| 3172 | struct bfd_link_info *info, |
| 3173 | bfd_boolean not_local_protected) |
| 3174 | { |
| 3175 | bfd_boolean binding_stays_local_p; |
| 3176 | const struct elf_backend_data *bed; |
| 3177 | struct elf_link_hash_table *hash_table; |
| 3178 | |
| 3179 | if (h == NULL) |
| 3180 | return FALSE; |
| 3181 | |
| 3182 | while (h->root.type == bfd_link_hash_indirect |
| 3183 | || h->root.type == bfd_link_hash_warning) |
| 3184 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 3185 | |
| 3186 | /* If it was forced local, then clearly it's not dynamic. */ |
| 3187 | if (h->dynindx == -1) |
| 3188 | return FALSE; |
| 3189 | if (h->forced_local) |
| 3190 | return FALSE; |
| 3191 | |
| 3192 | /* Identify the cases where name binding rules say that a |
| 3193 | visible symbol resolves locally. */ |
| 3194 | binding_stays_local_p = (bfd_link_executable (info) |
| 3195 | || SYMBOLIC_BIND (info, h)); |
| 3196 | |
| 3197 | switch (ELF_ST_VISIBILITY (h->other)) |
| 3198 | { |
| 3199 | case STV_INTERNAL: |
| 3200 | case STV_HIDDEN: |
| 3201 | return FALSE; |
| 3202 | |
| 3203 | case STV_PROTECTED: |
| 3204 | hash_table = elf_hash_table (info); |
| 3205 | if (!is_elf_hash_table (hash_table)) |
| 3206 | return FALSE; |
| 3207 | |
| 3208 | bed = get_elf_backend_data (hash_table->dynobj); |
| 3209 | |
| 3210 | /* Proper resolution for function pointer equality may require |
| 3211 | that these symbols perhaps be resolved dynamically, even though |
| 3212 | we should be resolving them to the current module. */ |
| 3213 | if (!not_local_protected || !bed->is_function_type (h->type)) |
| 3214 | binding_stays_local_p = TRUE; |
| 3215 | break; |
| 3216 | |
| 3217 | default: |
| 3218 | break; |
| 3219 | } |
| 3220 | |
| 3221 | /* If it isn't defined locally, then clearly it's dynamic. */ |
| 3222 | if (!h->def_regular && !ELF_COMMON_DEF_P (h)) |
| 3223 | return TRUE; |
| 3224 | |
| 3225 | /* Otherwise, the symbol is dynamic if binding rules don't tell |
| 3226 | us that it remains local. */ |
| 3227 | return !binding_stays_local_p; |
| 3228 | } |
| 3229 | |
| 3230 | /* Return true if the symbol referred to by H should be considered |
| 3231 | to resolve local to the current module, and false otherwise. Differs |
| 3232 | from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of |
| 3233 | undefined symbols. The two functions are virtually identical except |
| 3234 | for the place where dynindx == -1 is tested. If that test is true, |
| 3235 | _bfd_elf_dynamic_symbol_p will say the symbol is local, while |
| 3236 | _bfd_elf_symbol_refs_local_p will say the symbol is local only for |
| 3237 | defined symbols. |
| 3238 | It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as |
| 3239 | !_bfd_elf_symbol_refs_local_p, except that targets differ in their |
| 3240 | treatment of undefined weak symbols. For those that do not make |
| 3241 | undefined weak symbols dynamic, both functions may return false. */ |
| 3242 | |
| 3243 | bfd_boolean |
| 3244 | _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h, |
| 3245 | struct bfd_link_info *info, |
| 3246 | bfd_boolean local_protected) |
| 3247 | { |
| 3248 | const struct elf_backend_data *bed; |
| 3249 | struct elf_link_hash_table *hash_table; |
| 3250 | |
| 3251 | /* If it's a local sym, of course we resolve locally. */ |
| 3252 | if (h == NULL) |
| 3253 | return TRUE; |
| 3254 | |
| 3255 | /* STV_HIDDEN or STV_INTERNAL ones must be local. */ |
| 3256 | if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN |
| 3257 | || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL) |
| 3258 | return TRUE; |
| 3259 | |
| 3260 | /* Forced local symbols resolve locally. */ |
| 3261 | if (h->forced_local) |
| 3262 | return TRUE; |
| 3263 | |
| 3264 | /* Common symbols that become definitions don't get the DEF_REGULAR |
| 3265 | flag set, so test it first, and don't bail out. */ |
| 3266 | if (ELF_COMMON_DEF_P (h)) |
| 3267 | /* Do nothing. */; |
| 3268 | /* If we don't have a definition in a regular file, then we can't |
| 3269 | resolve locally. The sym is either undefined or dynamic. */ |
| 3270 | else if (!h->def_regular) |
| 3271 | return FALSE; |
| 3272 | |
| 3273 | /* Non-dynamic symbols resolve locally. */ |
| 3274 | if (h->dynindx == -1) |
| 3275 | return TRUE; |
| 3276 | |
| 3277 | /* At this point, we know the symbol is defined and dynamic. In an |
| 3278 | executable it must resolve locally, likewise when building symbolic |
| 3279 | shared libraries. */ |
| 3280 | if (bfd_link_executable (info) || SYMBOLIC_BIND (info, h)) |
| 3281 | return TRUE; |
| 3282 | |
| 3283 | /* Now deal with defined dynamic symbols in shared libraries. Ones |
| 3284 | with default visibility might not resolve locally. */ |
| 3285 | if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
| 3286 | return FALSE; |
| 3287 | |
| 3288 | hash_table = elf_hash_table (info); |
| 3289 | if (!is_elf_hash_table (hash_table)) |
| 3290 | return TRUE; |
| 3291 | |
| 3292 | bed = get_elf_backend_data (hash_table->dynobj); |
| 3293 | |
| 3294 | /* If extern_protected_data is false, STV_PROTECTED non-function |
| 3295 | symbols are local. */ |
| 3296 | if ((!info->extern_protected_data |
| 3297 | || (info->extern_protected_data < 0 |
| 3298 | && !bed->extern_protected_data)) |
| 3299 | && !bed->is_function_type (h->type)) |
| 3300 | return TRUE; |
| 3301 | |
| 3302 | /* Function pointer equality tests may require that STV_PROTECTED |
| 3303 | symbols be treated as dynamic symbols. If the address of a |
| 3304 | function not defined in an executable is set to that function's |
| 3305 | plt entry in the executable, then the address of the function in |
| 3306 | a shared library must also be the plt entry in the executable. */ |
| 3307 | return local_protected; |
| 3308 | } |
| 3309 | |
| 3310 | /* Caches some TLS segment info, and ensures that the TLS segment vma is |
| 3311 | aligned. Returns the first TLS output section. */ |
| 3312 | |
| 3313 | struct bfd_section * |
| 3314 | _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info) |
| 3315 | { |
| 3316 | struct bfd_section *sec, *tls; |
| 3317 | unsigned int align = 0; |
| 3318 | |
| 3319 | for (sec = obfd->sections; sec != NULL; sec = sec->next) |
| 3320 | if ((sec->flags & SEC_THREAD_LOCAL) != 0) |
| 3321 | break; |
| 3322 | tls = sec; |
| 3323 | |
| 3324 | for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next) |
| 3325 | if (sec->alignment_power > align) |
| 3326 | align = sec->alignment_power; |
| 3327 | |
| 3328 | elf_hash_table (info)->tls_sec = tls; |
| 3329 | |
| 3330 | /* Ensure the alignment of the first section is the largest alignment, |
| 3331 | so that the tls segment starts aligned. */ |
| 3332 | if (tls != NULL) |
| 3333 | tls->alignment_power = align; |
| 3334 | |
| 3335 | return tls; |
| 3336 | } |
| 3337 | |
| 3338 | /* Return TRUE iff this is a non-common, definition of a non-function symbol. */ |
| 3339 | static bfd_boolean |
| 3340 | is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED, |
| 3341 | Elf_Internal_Sym *sym) |
| 3342 | { |
| 3343 | const struct elf_backend_data *bed; |
| 3344 | |
| 3345 | /* Local symbols do not count, but target specific ones might. */ |
| 3346 | if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL |
| 3347 | && ELF_ST_BIND (sym->st_info) < STB_LOOS) |
| 3348 | return FALSE; |
| 3349 | |
| 3350 | bed = get_elf_backend_data (abfd); |
| 3351 | /* Function symbols do not count. */ |
| 3352 | if (bed->is_function_type (ELF_ST_TYPE (sym->st_info))) |
| 3353 | return FALSE; |
| 3354 | |
| 3355 | /* If the section is undefined, then so is the symbol. */ |
| 3356 | if (sym->st_shndx == SHN_UNDEF) |
| 3357 | return FALSE; |
| 3358 | |
| 3359 | /* If the symbol is defined in the common section, then |
| 3360 | it is a common definition and so does not count. */ |
| 3361 | if (bed->common_definition (sym)) |
| 3362 | return FALSE; |
| 3363 | |
| 3364 | /* If the symbol is in a target specific section then we |
| 3365 | must rely upon the backend to tell us what it is. */ |
| 3366 | if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS) |
| 3367 | /* FIXME - this function is not coded yet: |
| 3368 | |
| 3369 | return _bfd_is_global_symbol_definition (abfd, sym); |
| 3370 | |
| 3371 | Instead for now assume that the definition is not global, |
| 3372 | Even if this is wrong, at least the linker will behave |
| 3373 | in the same way that it used to do. */ |
| 3374 | return FALSE; |
| 3375 | |
| 3376 | return TRUE; |
| 3377 | } |
| 3378 | |
| 3379 | /* Search the symbol table of the archive element of the archive ABFD |
| 3380 | whose archive map contains a mention of SYMDEF, and determine if |
| 3381 | the symbol is defined in this element. */ |
| 3382 | static bfd_boolean |
| 3383 | elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef) |
| 3384 | { |
| 3385 | Elf_Internal_Shdr * hdr; |
| 3386 | size_t symcount; |
| 3387 | size_t extsymcount; |
| 3388 | size_t extsymoff; |
| 3389 | Elf_Internal_Sym *isymbuf; |
| 3390 | Elf_Internal_Sym *isym; |
| 3391 | Elf_Internal_Sym *isymend; |
| 3392 | bfd_boolean result; |
| 3393 | |
| 3394 | abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset); |
| 3395 | if (abfd == NULL) |
| 3396 | return FALSE; |
| 3397 | |
| 3398 | if (! bfd_check_format (abfd, bfd_object)) |
| 3399 | return FALSE; |
| 3400 | |
| 3401 | /* Select the appropriate symbol table. If we don't know if the |
| 3402 | object file is an IR object, give linker LTO plugin a chance to |
| 3403 | get the correct symbol table. */ |
| 3404 | if (abfd->plugin_format == bfd_plugin_yes |
| 3405 | #if BFD_SUPPORTS_PLUGINS |
| 3406 | || (abfd->plugin_format == bfd_plugin_unknown |
| 3407 | && bfd_link_plugin_object_p (abfd)) |
| 3408 | #endif |
| 3409 | ) |
| 3410 | { |
| 3411 | /* Use the IR symbol table if the object has been claimed by |
| 3412 | plugin. */ |
| 3413 | abfd = abfd->plugin_dummy_bfd; |
| 3414 | hdr = &elf_tdata (abfd)->symtab_hdr; |
| 3415 | } |
| 3416 | else if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0) |
| 3417 | hdr = &elf_tdata (abfd)->symtab_hdr; |
| 3418 | else |
| 3419 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; |
| 3420 | |
| 3421 | symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym; |
| 3422 | |
| 3423 | /* The sh_info field of the symtab header tells us where the |
| 3424 | external symbols start. We don't care about the local symbols. */ |
| 3425 | if (elf_bad_symtab (abfd)) |
| 3426 | { |
| 3427 | extsymcount = symcount; |
| 3428 | extsymoff = 0; |
| 3429 | } |
| 3430 | else |
| 3431 | { |
| 3432 | extsymcount = symcount - hdr->sh_info; |
| 3433 | extsymoff = hdr->sh_info; |
| 3434 | } |
| 3435 | |
| 3436 | if (extsymcount == 0) |
| 3437 | return FALSE; |
| 3438 | |
| 3439 | /* Read in the symbol table. */ |
| 3440 | isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff, |
| 3441 | NULL, NULL, NULL); |
| 3442 | if (isymbuf == NULL) |
| 3443 | return FALSE; |
| 3444 | |
| 3445 | /* Scan the symbol table looking for SYMDEF. */ |
| 3446 | result = FALSE; |
| 3447 | for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++) |
| 3448 | { |
| 3449 | const char *name; |
| 3450 | |
| 3451 | name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, |
| 3452 | isym->st_name); |
| 3453 | if (name == NULL) |
| 3454 | break; |
| 3455 | |
| 3456 | if (strcmp (name, symdef->name) == 0) |
| 3457 | { |
| 3458 | result = is_global_data_symbol_definition (abfd, isym); |
| 3459 | break; |
| 3460 | } |
| 3461 | } |
| 3462 | |
| 3463 | free (isymbuf); |
| 3464 | |
| 3465 | return result; |
| 3466 | } |
| 3467 | \f |
| 3468 | /* Add an entry to the .dynamic table. */ |
| 3469 | |
| 3470 | bfd_boolean |
| 3471 | _bfd_elf_add_dynamic_entry (struct bfd_link_info *info, |
| 3472 | bfd_vma tag, |
| 3473 | bfd_vma val) |
| 3474 | { |
| 3475 | struct elf_link_hash_table *hash_table; |
| 3476 | const struct elf_backend_data *bed; |
| 3477 | asection *s; |
| 3478 | bfd_size_type newsize; |
| 3479 | bfd_byte *newcontents; |
| 3480 | Elf_Internal_Dyn dyn; |
| 3481 | |
| 3482 | hash_table = elf_hash_table (info); |
| 3483 | if (! is_elf_hash_table (hash_table)) |
| 3484 | return FALSE; |
| 3485 | |
| 3486 | if (tag == DT_RELA || tag == DT_REL) |
| 3487 | hash_table->dynamic_relocs = TRUE; |
| 3488 | |
| 3489 | bed = get_elf_backend_data (hash_table->dynobj); |
| 3490 | s = bfd_get_linker_section (hash_table->dynobj, ".dynamic"); |
| 3491 | BFD_ASSERT (s != NULL); |
| 3492 | |
| 3493 | newsize = s->size + bed->s->sizeof_dyn; |
| 3494 | newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize); |
| 3495 | if (newcontents == NULL) |
| 3496 | return FALSE; |
| 3497 | |
| 3498 | dyn.d_tag = tag; |
| 3499 | dyn.d_un.d_val = val; |
| 3500 | bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size); |
| 3501 | |
| 3502 | s->size = newsize; |
| 3503 | s->contents = newcontents; |
| 3504 | |
| 3505 | return TRUE; |
| 3506 | } |
| 3507 | |
| 3508 | /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true, |
| 3509 | otherwise just check whether one already exists. Returns -1 on error, |
| 3510 | 1 if a DT_NEEDED tag already exists, and 0 on success. */ |
| 3511 | |
| 3512 | static int |
| 3513 | elf_add_dt_needed_tag (bfd *abfd, |
| 3514 | struct bfd_link_info *info, |
| 3515 | const char *soname, |
| 3516 | bfd_boolean do_it) |
| 3517 | { |
| 3518 | struct elf_link_hash_table *hash_table; |
| 3519 | size_t strindex; |
| 3520 | |
| 3521 | if (!_bfd_elf_link_create_dynstrtab (abfd, info)) |
| 3522 | return -1; |
| 3523 | |
| 3524 | hash_table = elf_hash_table (info); |
| 3525 | strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE); |
| 3526 | if (strindex == (size_t) -1) |
| 3527 | return -1; |
| 3528 | |
| 3529 | if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1) |
| 3530 | { |
| 3531 | asection *sdyn; |
| 3532 | const struct elf_backend_data *bed; |
| 3533 | bfd_byte *extdyn; |
| 3534 | |
| 3535 | bed = get_elf_backend_data (hash_table->dynobj); |
| 3536 | sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic"); |
| 3537 | if (sdyn != NULL) |
| 3538 | for (extdyn = sdyn->contents; |
| 3539 | extdyn < sdyn->contents + sdyn->size; |
| 3540 | extdyn += bed->s->sizeof_dyn) |
| 3541 | { |
| 3542 | Elf_Internal_Dyn dyn; |
| 3543 | |
| 3544 | bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn); |
| 3545 | if (dyn.d_tag == DT_NEEDED |
| 3546 | && dyn.d_un.d_val == strindex) |
| 3547 | { |
| 3548 | _bfd_elf_strtab_delref (hash_table->dynstr, strindex); |
| 3549 | return 1; |
| 3550 | } |
| 3551 | } |
| 3552 | } |
| 3553 | |
| 3554 | if (do_it) |
| 3555 | { |
| 3556 | if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info)) |
| 3557 | return -1; |
| 3558 | |
| 3559 | if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex)) |
| 3560 | return -1; |
| 3561 | } |
| 3562 | else |
| 3563 | /* We were just checking for existence of the tag. */ |
| 3564 | _bfd_elf_strtab_delref (hash_table->dynstr, strindex); |
| 3565 | |
| 3566 | return 0; |
| 3567 | } |
| 3568 | |
| 3569 | /* Return true if SONAME is on the needed list between NEEDED and STOP |
| 3570 | (or the end of list if STOP is NULL), and needed by a library that |
| 3571 | will be loaded. */ |
| 3572 | |
| 3573 | static bfd_boolean |
| 3574 | on_needed_list (const char *soname, |
| 3575 | struct bfd_link_needed_list *needed, |
| 3576 | struct bfd_link_needed_list *stop) |
| 3577 | { |
| 3578 | struct bfd_link_needed_list *look; |
| 3579 | for (look = needed; look != stop; look = look->next) |
| 3580 | if (strcmp (soname, look->name) == 0 |
| 3581 | && ((elf_dyn_lib_class (look->by) & DYN_AS_NEEDED) == 0 |
| 3582 | /* If needed by a library that itself is not directly |
| 3583 | needed, recursively check whether that library is |
| 3584 | indirectly needed. Since we add DT_NEEDED entries to |
| 3585 | the end of the list, library dependencies appear after |
| 3586 | the library. Therefore search prior to the current |
| 3587 | LOOK, preventing possible infinite recursion. */ |
| 3588 | || on_needed_list (elf_dt_name (look->by), needed, look))) |
| 3589 | return TRUE; |
| 3590 | |
| 3591 | return FALSE; |
| 3592 | } |
| 3593 | |
| 3594 | /* Sort symbol by value, section, and size. */ |
| 3595 | static int |
| 3596 | elf_sort_symbol (const void *arg1, const void *arg2) |
| 3597 | { |
| 3598 | const struct elf_link_hash_entry *h1; |
| 3599 | const struct elf_link_hash_entry *h2; |
| 3600 | bfd_signed_vma vdiff; |
| 3601 | |
| 3602 | h1 = *(const struct elf_link_hash_entry **) arg1; |
| 3603 | h2 = *(const struct elf_link_hash_entry **) arg2; |
| 3604 | vdiff = h1->root.u.def.value - h2->root.u.def.value; |
| 3605 | if (vdiff != 0) |
| 3606 | return vdiff > 0 ? 1 : -1; |
| 3607 | else |
| 3608 | { |
| 3609 | int sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id; |
| 3610 | if (sdiff != 0) |
| 3611 | return sdiff > 0 ? 1 : -1; |
| 3612 | } |
| 3613 | vdiff = h1->size - h2->size; |
| 3614 | return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1; |
| 3615 | } |
| 3616 | |
| 3617 | /* This function is used to adjust offsets into .dynstr for |
| 3618 | dynamic symbols. This is called via elf_link_hash_traverse. */ |
| 3619 | |
| 3620 | static bfd_boolean |
| 3621 | elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data) |
| 3622 | { |
| 3623 | struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data; |
| 3624 | |
| 3625 | if (h->dynindx != -1) |
| 3626 | h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index); |
| 3627 | return TRUE; |
| 3628 | } |
| 3629 | |
| 3630 | /* Assign string offsets in .dynstr, update all structures referencing |
| 3631 | them. */ |
| 3632 | |
| 3633 | static bfd_boolean |
| 3634 | elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info) |
| 3635 | { |
| 3636 | struct elf_link_hash_table *hash_table = elf_hash_table (info); |
| 3637 | struct elf_link_local_dynamic_entry *entry; |
| 3638 | struct elf_strtab_hash *dynstr = hash_table->dynstr; |
| 3639 | bfd *dynobj = hash_table->dynobj; |
| 3640 | asection *sdyn; |
| 3641 | bfd_size_type size; |
| 3642 | const struct elf_backend_data *bed; |
| 3643 | bfd_byte *extdyn; |
| 3644 | |
| 3645 | _bfd_elf_strtab_finalize (dynstr); |
| 3646 | size = _bfd_elf_strtab_size (dynstr); |
| 3647 | |
| 3648 | bed = get_elf_backend_data (dynobj); |
| 3649 | sdyn = bfd_get_linker_section (dynobj, ".dynamic"); |
| 3650 | BFD_ASSERT (sdyn != NULL); |
| 3651 | |
| 3652 | /* Update all .dynamic entries referencing .dynstr strings. */ |
| 3653 | for (extdyn = sdyn->contents; |
| 3654 | extdyn < sdyn->contents + sdyn->size; |
| 3655 | extdyn += bed->s->sizeof_dyn) |
| 3656 | { |
| 3657 | Elf_Internal_Dyn dyn; |
| 3658 | |
| 3659 | bed->s->swap_dyn_in (dynobj, extdyn, &dyn); |
| 3660 | switch (dyn.d_tag) |
| 3661 | { |
| 3662 | case DT_STRSZ: |
| 3663 | dyn.d_un.d_val = size; |
| 3664 | break; |
| 3665 | case DT_NEEDED: |
| 3666 | case DT_SONAME: |
| 3667 | case DT_RPATH: |
| 3668 | case DT_RUNPATH: |
| 3669 | case DT_FILTER: |
| 3670 | case DT_AUXILIARY: |
| 3671 | case DT_AUDIT: |
| 3672 | case DT_DEPAUDIT: |
| 3673 | dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val); |
| 3674 | break; |
| 3675 | default: |
| 3676 | continue; |
| 3677 | } |
| 3678 | bed->s->swap_dyn_out (dynobj, &dyn, extdyn); |
| 3679 | } |
| 3680 | |
| 3681 | /* Now update local dynamic symbols. */ |
| 3682 | for (entry = hash_table->dynlocal; entry ; entry = entry->next) |
| 3683 | entry->isym.st_name = _bfd_elf_strtab_offset (dynstr, |
| 3684 | entry->isym.st_name); |
| 3685 | |
| 3686 | /* And the rest of dynamic symbols. */ |
| 3687 | elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr); |
| 3688 | |
| 3689 | /* Adjust version definitions. */ |
| 3690 | if (elf_tdata (output_bfd)->cverdefs) |
| 3691 | { |
| 3692 | asection *s; |
| 3693 | bfd_byte *p; |
| 3694 | size_t i; |
| 3695 | Elf_Internal_Verdef def; |
| 3696 | Elf_Internal_Verdaux defaux; |
| 3697 | |
| 3698 | s = bfd_get_linker_section (dynobj, ".gnu.version_d"); |
| 3699 | p = s->contents; |
| 3700 | do |
| 3701 | { |
| 3702 | _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p, |
| 3703 | &def); |
| 3704 | p += sizeof (Elf_External_Verdef); |
| 3705 | if (def.vd_aux != sizeof (Elf_External_Verdef)) |
| 3706 | continue; |
| 3707 | for (i = 0; i < def.vd_cnt; ++i) |
| 3708 | { |
| 3709 | _bfd_elf_swap_verdaux_in (output_bfd, |
| 3710 | (Elf_External_Verdaux *) p, &defaux); |
| 3711 | defaux.vda_name = _bfd_elf_strtab_offset (dynstr, |
| 3712 | defaux.vda_name); |
| 3713 | _bfd_elf_swap_verdaux_out (output_bfd, |
| 3714 | &defaux, (Elf_External_Verdaux *) p); |
| 3715 | p += sizeof (Elf_External_Verdaux); |
| 3716 | } |
| 3717 | } |
| 3718 | while (def.vd_next); |
| 3719 | } |
| 3720 | |
| 3721 | /* Adjust version references. */ |
| 3722 | if (elf_tdata (output_bfd)->verref) |
| 3723 | { |
| 3724 | asection *s; |
| 3725 | bfd_byte *p; |
| 3726 | size_t i; |
| 3727 | Elf_Internal_Verneed need; |
| 3728 | Elf_Internal_Vernaux needaux; |
| 3729 | |
| 3730 | s = bfd_get_linker_section (dynobj, ".gnu.version_r"); |
| 3731 | p = s->contents; |
| 3732 | do |
| 3733 | { |
| 3734 | _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p, |
| 3735 | &need); |
| 3736 | need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file); |
| 3737 | _bfd_elf_swap_verneed_out (output_bfd, &need, |
| 3738 | (Elf_External_Verneed *) p); |
| 3739 | p += sizeof (Elf_External_Verneed); |
| 3740 | for (i = 0; i < need.vn_cnt; ++i) |
| 3741 | { |
| 3742 | _bfd_elf_swap_vernaux_in (output_bfd, |
| 3743 | (Elf_External_Vernaux *) p, &needaux); |
| 3744 | needaux.vna_name = _bfd_elf_strtab_offset (dynstr, |
| 3745 | needaux.vna_name); |
| 3746 | _bfd_elf_swap_vernaux_out (output_bfd, |
| 3747 | &needaux, |
| 3748 | (Elf_External_Vernaux *) p); |
| 3749 | p += sizeof (Elf_External_Vernaux); |
| 3750 | } |
| 3751 | } |
| 3752 | while (need.vn_next); |
| 3753 | } |
| 3754 | |
| 3755 | return TRUE; |
| 3756 | } |
| 3757 | \f |
| 3758 | /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. |
| 3759 | The default is to only match when the INPUT and OUTPUT are exactly |
| 3760 | the same target. */ |
| 3761 | |
| 3762 | bfd_boolean |
| 3763 | _bfd_elf_default_relocs_compatible (const bfd_target *input, |
| 3764 | const bfd_target *output) |
| 3765 | { |
| 3766 | return input == output; |
| 3767 | } |
| 3768 | |
| 3769 | /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. |
| 3770 | This version is used when different targets for the same architecture |
| 3771 | are virtually identical. */ |
| 3772 | |
| 3773 | bfd_boolean |
| 3774 | _bfd_elf_relocs_compatible (const bfd_target *input, |
| 3775 | const bfd_target *output) |
| 3776 | { |
| 3777 | const struct elf_backend_data *obed, *ibed; |
| 3778 | |
| 3779 | if (input == output) |
| 3780 | return TRUE; |
| 3781 | |
| 3782 | ibed = xvec_get_elf_backend_data (input); |
| 3783 | obed = xvec_get_elf_backend_data (output); |
| 3784 | |
| 3785 | if (ibed->arch != obed->arch) |
| 3786 | return FALSE; |
| 3787 | |
| 3788 | /* If both backends are using this function, deem them compatible. */ |
| 3789 | return ibed->relocs_compatible == obed->relocs_compatible; |
| 3790 | } |
| 3791 | |
| 3792 | /* Make a special call to the linker "notice" function to tell it that |
| 3793 | we are about to handle an as-needed lib, or have finished |
| 3794 | processing the lib. */ |
| 3795 | |
| 3796 | bfd_boolean |
| 3797 | _bfd_elf_notice_as_needed (bfd *ibfd, |
| 3798 | struct bfd_link_info *info, |
| 3799 | enum notice_asneeded_action act) |
| 3800 | { |
| 3801 | return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0); |
| 3802 | } |
| 3803 | |
| 3804 | /* Check relocations an ELF object file. */ |
| 3805 | |
| 3806 | bfd_boolean |
| 3807 | _bfd_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info) |
| 3808 | { |
| 3809 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 3810 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 3811 | |
| 3812 | /* If this object is the same format as the output object, and it is |
| 3813 | not a shared library, then let the backend look through the |
| 3814 | relocs. |
| 3815 | |
| 3816 | This is required to build global offset table entries and to |
| 3817 | arrange for dynamic relocs. It is not required for the |
| 3818 | particular common case of linking non PIC code, even when linking |
| 3819 | against shared libraries, but unfortunately there is no way of |
| 3820 | knowing whether an object file has been compiled PIC or not. |
| 3821 | Looking through the relocs is not particularly time consuming. |
| 3822 | The problem is that we must either (1) keep the relocs in memory, |
| 3823 | which causes the linker to require additional runtime memory or |
| 3824 | (2) read the relocs twice from the input file, which wastes time. |
| 3825 | This would be a good case for using mmap. |
| 3826 | |
| 3827 | I have no idea how to handle linking PIC code into a file of a |
| 3828 | different format. It probably can't be done. */ |
| 3829 | if ((abfd->flags & DYNAMIC) == 0 |
| 3830 | && is_elf_hash_table (htab) |
| 3831 | && bed->check_relocs != NULL |
| 3832 | && elf_object_id (abfd) == elf_hash_table_id (htab) |
| 3833 | && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec)) |
| 3834 | { |
| 3835 | asection *o; |
| 3836 | |
| 3837 | for (o = abfd->sections; o != NULL; o = o->next) |
| 3838 | { |
| 3839 | Elf_Internal_Rela *internal_relocs; |
| 3840 | bfd_boolean ok; |
| 3841 | |
| 3842 | /* Don't check relocations in excluded sections. */ |
| 3843 | if ((o->flags & SEC_RELOC) == 0 |
| 3844 | || (o->flags & SEC_EXCLUDE) != 0 |
| 3845 | || o->reloc_count == 0 |
| 3846 | || ((info->strip == strip_all || info->strip == strip_debugger) |
| 3847 | && (o->flags & SEC_DEBUGGING) != 0) |
| 3848 | || bfd_is_abs_section (o->output_section)) |
| 3849 | continue; |
| 3850 | |
| 3851 | internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL, |
| 3852 | info->keep_memory); |
| 3853 | if (internal_relocs == NULL) |
| 3854 | return FALSE; |
| 3855 | |
| 3856 | ok = (*bed->check_relocs) (abfd, info, o, internal_relocs); |
| 3857 | |
| 3858 | if (elf_section_data (o)->relocs != internal_relocs) |
| 3859 | free (internal_relocs); |
| 3860 | |
| 3861 | if (! ok) |
| 3862 | return FALSE; |
| 3863 | } |
| 3864 | } |
| 3865 | |
| 3866 | return TRUE; |
| 3867 | } |
| 3868 | |
| 3869 | /* Add symbols from an ELF object file to the linker hash table. */ |
| 3870 | |
| 3871 | static bfd_boolean |
| 3872 | elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info) |
| 3873 | { |
| 3874 | Elf_Internal_Ehdr *ehdr; |
| 3875 | Elf_Internal_Shdr *hdr; |
| 3876 | size_t symcount; |
| 3877 | size_t extsymcount; |
| 3878 | size_t extsymoff; |
| 3879 | struct elf_link_hash_entry **sym_hash; |
| 3880 | bfd_boolean dynamic; |
| 3881 | Elf_External_Versym *extversym = NULL; |
| 3882 | Elf_External_Versym *extversym_end = NULL; |
| 3883 | Elf_External_Versym *ever; |
| 3884 | struct elf_link_hash_entry *weaks; |
| 3885 | struct elf_link_hash_entry **nondeflt_vers = NULL; |
| 3886 | size_t nondeflt_vers_cnt = 0; |
| 3887 | Elf_Internal_Sym *isymbuf = NULL; |
| 3888 | Elf_Internal_Sym *isym; |
| 3889 | Elf_Internal_Sym *isymend; |
| 3890 | const struct elf_backend_data *bed; |
| 3891 | bfd_boolean add_needed; |
| 3892 | struct elf_link_hash_table *htab; |
| 3893 | bfd_size_type amt; |
| 3894 | void *alloc_mark = NULL; |
| 3895 | struct bfd_hash_entry **old_table = NULL; |
| 3896 | unsigned int old_size = 0; |
| 3897 | unsigned int old_count = 0; |
| 3898 | void *old_tab = NULL; |
| 3899 | void *old_ent; |
| 3900 | struct bfd_link_hash_entry *old_undefs = NULL; |
| 3901 | struct bfd_link_hash_entry *old_undefs_tail = NULL; |
| 3902 | void *old_strtab = NULL; |
| 3903 | size_t tabsize = 0; |
| 3904 | asection *s; |
| 3905 | bfd_boolean just_syms; |
| 3906 | |
| 3907 | htab = elf_hash_table (info); |
| 3908 | bed = get_elf_backend_data (abfd); |
| 3909 | |
| 3910 | if ((abfd->flags & DYNAMIC) == 0) |
| 3911 | dynamic = FALSE; |
| 3912 | else |
| 3913 | { |
| 3914 | dynamic = TRUE; |
| 3915 | |
| 3916 | /* You can't use -r against a dynamic object. Also, there's no |
| 3917 | hope of using a dynamic object which does not exactly match |
| 3918 | the format of the output file. */ |
| 3919 | if (bfd_link_relocatable (info) |
| 3920 | || !is_elf_hash_table (htab) |
| 3921 | || info->output_bfd->xvec != abfd->xvec) |
| 3922 | { |
| 3923 | if (bfd_link_relocatable (info)) |
| 3924 | bfd_set_error (bfd_error_invalid_operation); |
| 3925 | else |
| 3926 | bfd_set_error (bfd_error_wrong_format); |
| 3927 | goto error_return; |
| 3928 | } |
| 3929 | } |
| 3930 | |
| 3931 | ehdr = elf_elfheader (abfd); |
| 3932 | if (info->warn_alternate_em |
| 3933 | && bed->elf_machine_code != ehdr->e_machine |
| 3934 | && ((bed->elf_machine_alt1 != 0 |
| 3935 | && ehdr->e_machine == bed->elf_machine_alt1) |
| 3936 | || (bed->elf_machine_alt2 != 0 |
| 3937 | && ehdr->e_machine == bed->elf_machine_alt2))) |
| 3938 | _bfd_error_handler |
| 3939 | /* xgettext:c-format */ |
| 3940 | (_("alternate ELF machine code found (%d) in %pB, expecting %d"), |
| 3941 | ehdr->e_machine, abfd, bed->elf_machine_code); |
| 3942 | |
| 3943 | /* As a GNU extension, any input sections which are named |
| 3944 | .gnu.warning.SYMBOL are treated as warning symbols for the given |
| 3945 | symbol. This differs from .gnu.warning sections, which generate |
| 3946 | warnings when they are included in an output file. */ |
| 3947 | /* PR 12761: Also generate this warning when building shared libraries. */ |
| 3948 | for (s = abfd->sections; s != NULL; s = s->next) |
| 3949 | { |
| 3950 | const char *name; |
| 3951 | |
| 3952 | name = bfd_get_section_name (abfd, s); |
| 3953 | if (CONST_STRNEQ (name, ".gnu.warning.")) |
| 3954 | { |
| 3955 | char *msg; |
| 3956 | bfd_size_type sz; |
| 3957 | |
| 3958 | name += sizeof ".gnu.warning." - 1; |
| 3959 | |
| 3960 | /* If this is a shared object, then look up the symbol |
| 3961 | in the hash table. If it is there, and it is already |
| 3962 | been defined, then we will not be using the entry |
| 3963 | from this shared object, so we don't need to warn. |
| 3964 | FIXME: If we see the definition in a regular object |
| 3965 | later on, we will warn, but we shouldn't. The only |
| 3966 | fix is to keep track of what warnings we are supposed |
| 3967 | to emit, and then handle them all at the end of the |
| 3968 | link. */ |
| 3969 | if (dynamic) |
| 3970 | { |
| 3971 | struct elf_link_hash_entry *h; |
| 3972 | |
| 3973 | h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE); |
| 3974 | |
| 3975 | /* FIXME: What about bfd_link_hash_common? */ |
| 3976 | if (h != NULL |
| 3977 | && (h->root.type == bfd_link_hash_defined |
| 3978 | || h->root.type == bfd_link_hash_defweak)) |
| 3979 | continue; |
| 3980 | } |
| 3981 | |
| 3982 | sz = s->size; |
| 3983 | msg = (char *) bfd_alloc (abfd, sz + 1); |
| 3984 | if (msg == NULL) |
| 3985 | goto error_return; |
| 3986 | |
| 3987 | if (! bfd_get_section_contents (abfd, s, msg, 0, sz)) |
| 3988 | goto error_return; |
| 3989 | |
| 3990 | msg[sz] = '\0'; |
| 3991 | |
| 3992 | if (! (_bfd_generic_link_add_one_symbol |
| 3993 | (info, abfd, name, BSF_WARNING, s, 0, msg, |
| 3994 | FALSE, bed->collect, NULL))) |
| 3995 | goto error_return; |
| 3996 | |
| 3997 | if (bfd_link_executable (info)) |
| 3998 | { |
| 3999 | /* Clobber the section size so that the warning does |
| 4000 | not get copied into the output file. */ |
| 4001 | s->size = 0; |
| 4002 | |
| 4003 | /* Also set SEC_EXCLUDE, so that symbols defined in |
| 4004 | the warning section don't get copied to the output. */ |
| 4005 | s->flags |= SEC_EXCLUDE; |
| 4006 | } |
| 4007 | } |
| 4008 | } |
| 4009 | |
| 4010 | just_syms = ((s = abfd->sections) != NULL |
| 4011 | && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS); |
| 4012 | |
| 4013 | add_needed = TRUE; |
| 4014 | if (! dynamic) |
| 4015 | { |
| 4016 | /* If we are creating a shared library, create all the dynamic |
| 4017 | sections immediately. We need to attach them to something, |
| 4018 | so we attach them to this BFD, provided it is the right |
| 4019 | format and is not from ld --just-symbols. Always create the |
| 4020 | dynamic sections for -E/--dynamic-list. FIXME: If there |
| 4021 | are no input BFD's of the same format as the output, we can't |
| 4022 | make a shared library. */ |
| 4023 | if (!just_syms |
| 4024 | && (bfd_link_pic (info) |
| 4025 | || (!bfd_link_relocatable (info) |
| 4026 | && info->nointerp |
| 4027 | && (info->export_dynamic || info->dynamic))) |
| 4028 | && is_elf_hash_table (htab) |
| 4029 | && info->output_bfd->xvec == abfd->xvec |
| 4030 | && !htab->dynamic_sections_created) |
| 4031 | { |
| 4032 | if (! _bfd_elf_link_create_dynamic_sections (abfd, info)) |
| 4033 | goto error_return; |
| 4034 | } |
| 4035 | } |
| 4036 | else if (!is_elf_hash_table (htab)) |
| 4037 | goto error_return; |
| 4038 | else |
| 4039 | { |
| 4040 | const char *soname = NULL; |
| 4041 | char *audit = NULL; |
| 4042 | struct bfd_link_needed_list *rpath = NULL, *runpath = NULL; |
| 4043 | const Elf_Internal_Phdr *phdr; |
| 4044 | int ret; |
| 4045 | |
| 4046 | /* ld --just-symbols and dynamic objects don't mix very well. |
| 4047 | ld shouldn't allow it. */ |
| 4048 | if (just_syms) |
| 4049 | abort (); |
| 4050 | |
| 4051 | /* If this dynamic lib was specified on the command line with |
| 4052 | --as-needed in effect, then we don't want to add a DT_NEEDED |
| 4053 | tag unless the lib is actually used. Similary for libs brought |
| 4054 | in by another lib's DT_NEEDED. When --no-add-needed is used |
| 4055 | on a dynamic lib, we don't want to add a DT_NEEDED entry for |
| 4056 | any dynamic library in DT_NEEDED tags in the dynamic lib at |
| 4057 | all. */ |
| 4058 | add_needed = (elf_dyn_lib_class (abfd) |
| 4059 | & (DYN_AS_NEEDED | DYN_DT_NEEDED |
| 4060 | | DYN_NO_NEEDED)) == 0; |
| 4061 | |
| 4062 | s = bfd_get_section_by_name (abfd, ".dynamic"); |
| 4063 | if (s != NULL) |
| 4064 | { |
| 4065 | bfd_byte *dynbuf; |
| 4066 | bfd_byte *extdyn; |
| 4067 | unsigned int elfsec; |
| 4068 | unsigned long shlink; |
| 4069 | |
| 4070 | if (!bfd_malloc_and_get_section (abfd, s, &dynbuf)) |
| 4071 | { |
| 4072 | error_free_dyn: |
| 4073 | free (dynbuf); |
| 4074 | goto error_return; |
| 4075 | } |
| 4076 | |
| 4077 | elfsec = _bfd_elf_section_from_bfd_section (abfd, s); |
| 4078 | if (elfsec == SHN_BAD) |
| 4079 | goto error_free_dyn; |
| 4080 | shlink = elf_elfsections (abfd)[elfsec]->sh_link; |
| 4081 | |
| 4082 | for (extdyn = dynbuf; |
| 4083 | extdyn <= dynbuf + s->size - bed->s->sizeof_dyn; |
| 4084 | extdyn += bed->s->sizeof_dyn) |
| 4085 | { |
| 4086 | Elf_Internal_Dyn dyn; |
| 4087 | |
| 4088 | bed->s->swap_dyn_in (abfd, extdyn, &dyn); |
| 4089 | if (dyn.d_tag == DT_SONAME) |
| 4090 | { |
| 4091 | unsigned int tagv = dyn.d_un.d_val; |
| 4092 | soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 4093 | if (soname == NULL) |
| 4094 | goto error_free_dyn; |
| 4095 | } |
| 4096 | if (dyn.d_tag == DT_NEEDED) |
| 4097 | { |
| 4098 | struct bfd_link_needed_list *n, **pn; |
| 4099 | char *fnm, *anm; |
| 4100 | unsigned int tagv = dyn.d_un.d_val; |
| 4101 | |
| 4102 | amt = sizeof (struct bfd_link_needed_list); |
| 4103 | n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt); |
| 4104 | fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 4105 | if (n == NULL || fnm == NULL) |
| 4106 | goto error_free_dyn; |
| 4107 | amt = strlen (fnm) + 1; |
| 4108 | anm = (char *) bfd_alloc (abfd, amt); |
| 4109 | if (anm == NULL) |
| 4110 | goto error_free_dyn; |
| 4111 | memcpy (anm, fnm, amt); |
| 4112 | n->name = anm; |
| 4113 | n->by = abfd; |
| 4114 | n->next = NULL; |
| 4115 | for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next) |
| 4116 | ; |
| 4117 | *pn = n; |
| 4118 | } |
| 4119 | if (dyn.d_tag == DT_RUNPATH) |
| 4120 | { |
| 4121 | struct bfd_link_needed_list *n, **pn; |
| 4122 | char *fnm, *anm; |
| 4123 | unsigned int tagv = dyn.d_un.d_val; |
| 4124 | |
| 4125 | amt = sizeof (struct bfd_link_needed_list); |
| 4126 | n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt); |
| 4127 | fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 4128 | if (n == NULL || fnm == NULL) |
| 4129 | goto error_free_dyn; |
| 4130 | amt = strlen (fnm) + 1; |
| 4131 | anm = (char *) bfd_alloc (abfd, amt); |
| 4132 | if (anm == NULL) |
| 4133 | goto error_free_dyn; |
| 4134 | memcpy (anm, fnm, amt); |
| 4135 | n->name = anm; |
| 4136 | n->by = abfd; |
| 4137 | n->next = NULL; |
| 4138 | for (pn = & runpath; |
| 4139 | *pn != NULL; |
| 4140 | pn = &(*pn)->next) |
| 4141 | ; |
| 4142 | *pn = n; |
| 4143 | } |
| 4144 | /* Ignore DT_RPATH if we have seen DT_RUNPATH. */ |
| 4145 | if (!runpath && dyn.d_tag == DT_RPATH) |
| 4146 | { |
| 4147 | struct bfd_link_needed_list *n, **pn; |
| 4148 | char *fnm, *anm; |
| 4149 | unsigned int tagv = dyn.d_un.d_val; |
| 4150 | |
| 4151 | amt = sizeof (struct bfd_link_needed_list); |
| 4152 | n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt); |
| 4153 | fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 4154 | if (n == NULL || fnm == NULL) |
| 4155 | goto error_free_dyn; |
| 4156 | amt = strlen (fnm) + 1; |
| 4157 | anm = (char *) bfd_alloc (abfd, amt); |
| 4158 | if (anm == NULL) |
| 4159 | goto error_free_dyn; |
| 4160 | memcpy (anm, fnm, amt); |
| 4161 | n->name = anm; |
| 4162 | n->by = abfd; |
| 4163 | n->next = NULL; |
| 4164 | for (pn = & rpath; |
| 4165 | *pn != NULL; |
| 4166 | pn = &(*pn)->next) |
| 4167 | ; |
| 4168 | *pn = n; |
| 4169 | } |
| 4170 | if (dyn.d_tag == DT_AUDIT) |
| 4171 | { |
| 4172 | unsigned int tagv = dyn.d_un.d_val; |
| 4173 | audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 4174 | } |
| 4175 | } |
| 4176 | |
| 4177 | free (dynbuf); |
| 4178 | } |
| 4179 | |
| 4180 | /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that |
| 4181 | frees all more recently bfd_alloc'd blocks as well. */ |
| 4182 | if (runpath) |
| 4183 | rpath = runpath; |
| 4184 | |
| 4185 | if (rpath) |
| 4186 | { |
| 4187 | struct bfd_link_needed_list **pn; |
| 4188 | for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next) |
| 4189 | ; |
| 4190 | *pn = rpath; |
| 4191 | } |
| 4192 | |
| 4193 | /* If we have a PT_GNU_RELRO program header, mark as read-only |
| 4194 | all sections contained fully therein. This makes relro |
| 4195 | shared library sections appear as they will at run-time. */ |
| 4196 | phdr = elf_tdata (abfd)->phdr + elf_elfheader (abfd)->e_phnum; |
| 4197 | while (phdr-- > elf_tdata (abfd)->phdr) |
| 4198 | if (phdr->p_type == PT_GNU_RELRO) |
| 4199 | { |
| 4200 | for (s = abfd->sections; s != NULL; s = s->next) |
| 4201 | if ((s->flags & SEC_ALLOC) != 0 |
| 4202 | && s->vma >= phdr->p_vaddr |
| 4203 | && s->vma + s->size <= phdr->p_vaddr + phdr->p_memsz) |
| 4204 | s->flags |= SEC_READONLY; |
| 4205 | break; |
| 4206 | } |
| 4207 | |
| 4208 | /* We do not want to include any of the sections in a dynamic |
| 4209 | object in the output file. We hack by simply clobbering the |
| 4210 | list of sections in the BFD. This could be handled more |
| 4211 | cleanly by, say, a new section flag; the existing |
| 4212 | SEC_NEVER_LOAD flag is not the one we want, because that one |
| 4213 | still implies that the section takes up space in the output |
| 4214 | file. */ |
| 4215 | bfd_section_list_clear (abfd); |
| 4216 | |
| 4217 | /* Find the name to use in a DT_NEEDED entry that refers to this |
| 4218 | object. If the object has a DT_SONAME entry, we use it. |
| 4219 | Otherwise, if the generic linker stuck something in |
| 4220 | elf_dt_name, we use that. Otherwise, we just use the file |
| 4221 | name. */ |
| 4222 | if (soname == NULL || *soname == '\0') |
| 4223 | { |
| 4224 | soname = elf_dt_name (abfd); |
| 4225 | if (soname == NULL || *soname == '\0') |
| 4226 | soname = bfd_get_filename (abfd); |
| 4227 | } |
| 4228 | |
| 4229 | /* Save the SONAME because sometimes the linker emulation code |
| 4230 | will need to know it. */ |
| 4231 | elf_dt_name (abfd) = soname; |
| 4232 | |
| 4233 | ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed); |
| 4234 | if (ret < 0) |
| 4235 | goto error_return; |
| 4236 | |
| 4237 | /* If we have already included this dynamic object in the |
| 4238 | link, just ignore it. There is no reason to include a |
| 4239 | particular dynamic object more than once. */ |
| 4240 | if (ret > 0) |
| 4241 | return TRUE; |
| 4242 | |
| 4243 | /* Save the DT_AUDIT entry for the linker emulation code. */ |
| 4244 | elf_dt_audit (abfd) = audit; |
| 4245 | } |
| 4246 | |
| 4247 | /* If this is a dynamic object, we always link against the .dynsym |
| 4248 | symbol table, not the .symtab symbol table. The dynamic linker |
| 4249 | will only see the .dynsym symbol table, so there is no reason to |
| 4250 | look at .symtab for a dynamic object. */ |
| 4251 | |
| 4252 | if (! dynamic || elf_dynsymtab (abfd) == 0) |
| 4253 | hdr = &elf_tdata (abfd)->symtab_hdr; |
| 4254 | else |
| 4255 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; |
| 4256 | |
| 4257 | symcount = hdr->sh_size / bed->s->sizeof_sym; |
| 4258 | |
| 4259 | /* The sh_info field of the symtab header tells us where the |
| 4260 | external symbols start. We don't care about the local symbols at |
| 4261 | this point. */ |
| 4262 | if (elf_bad_symtab (abfd)) |
| 4263 | { |
| 4264 | extsymcount = symcount; |
| 4265 | extsymoff = 0; |
| 4266 | } |
| 4267 | else |
| 4268 | { |
| 4269 | extsymcount = symcount - hdr->sh_info; |
| 4270 | extsymoff = hdr->sh_info; |
| 4271 | } |
| 4272 | |
| 4273 | sym_hash = elf_sym_hashes (abfd); |
| 4274 | if (extsymcount != 0) |
| 4275 | { |
| 4276 | isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff, |
| 4277 | NULL, NULL, NULL); |
| 4278 | if (isymbuf == NULL) |
| 4279 | goto error_return; |
| 4280 | |
| 4281 | if (sym_hash == NULL) |
| 4282 | { |
| 4283 | /* We store a pointer to the hash table entry for each |
| 4284 | external symbol. */ |
| 4285 | amt = extsymcount; |
| 4286 | amt *= sizeof (struct elf_link_hash_entry *); |
| 4287 | sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt); |
| 4288 | if (sym_hash == NULL) |
| 4289 | goto error_free_sym; |
| 4290 | elf_sym_hashes (abfd) = sym_hash; |
| 4291 | } |
| 4292 | } |
| 4293 | |
| 4294 | if (dynamic) |
| 4295 | { |
| 4296 | /* Read in any version definitions. */ |
| 4297 | if (!_bfd_elf_slurp_version_tables (abfd, |
| 4298 | info->default_imported_symver)) |
| 4299 | goto error_free_sym; |
| 4300 | |
| 4301 | /* Read in the symbol versions, but don't bother to convert them |
| 4302 | to internal format. */ |
| 4303 | if (elf_dynversym (abfd) != 0) |
| 4304 | { |
| 4305 | Elf_Internal_Shdr *versymhdr; |
| 4306 | |
| 4307 | versymhdr = &elf_tdata (abfd)->dynversym_hdr; |
| 4308 | amt = versymhdr->sh_size; |
| 4309 | extversym = (Elf_External_Versym *) bfd_malloc (amt); |
| 4310 | if (extversym == NULL) |
| 4311 | goto error_free_sym; |
| 4312 | if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0 |
| 4313 | || bfd_bread (extversym, amt, abfd) != amt) |
| 4314 | goto error_free_vers; |
| 4315 | extversym_end = extversym + (amt / sizeof (* extversym)); |
| 4316 | } |
| 4317 | } |
| 4318 | |
| 4319 | /* If we are loading an as-needed shared lib, save the symbol table |
| 4320 | state before we start adding symbols. If the lib turns out |
| 4321 | to be unneeded, restore the state. */ |
| 4322 | if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0) |
| 4323 | { |
| 4324 | unsigned int i; |
| 4325 | size_t entsize; |
| 4326 | |
| 4327 | for (entsize = 0, i = 0; i < htab->root.table.size; i++) |
| 4328 | { |
| 4329 | struct bfd_hash_entry *p; |
| 4330 | struct elf_link_hash_entry *h; |
| 4331 | |
| 4332 | for (p = htab->root.table.table[i]; p != NULL; p = p->next) |
| 4333 | { |
| 4334 | h = (struct elf_link_hash_entry *) p; |
| 4335 | entsize += htab->root.table.entsize; |
| 4336 | if (h->root.type == bfd_link_hash_warning) |
| 4337 | entsize += htab->root.table.entsize; |
| 4338 | } |
| 4339 | } |
| 4340 | |
| 4341 | tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *); |
| 4342 | old_tab = bfd_malloc (tabsize + entsize); |
| 4343 | if (old_tab == NULL) |
| 4344 | goto error_free_vers; |
| 4345 | |
| 4346 | /* Remember the current objalloc pointer, so that all mem for |
| 4347 | symbols added can later be reclaimed. */ |
| 4348 | alloc_mark = bfd_hash_allocate (&htab->root.table, 1); |
| 4349 | if (alloc_mark == NULL) |
| 4350 | goto error_free_vers; |
| 4351 | |
| 4352 | /* Make a special call to the linker "notice" function to |
| 4353 | tell it that we are about to handle an as-needed lib. */ |
| 4354 | if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed)) |
| 4355 | goto error_free_vers; |
| 4356 | |
| 4357 | /* Clone the symbol table. Remember some pointers into the |
| 4358 | symbol table, and dynamic symbol count. */ |
| 4359 | old_ent = (char *) old_tab + tabsize; |
| 4360 | memcpy (old_tab, htab->root.table.table, tabsize); |
| 4361 | old_undefs = htab->root.undefs; |
| 4362 | old_undefs_tail = htab->root.undefs_tail; |
| 4363 | old_table = htab->root.table.table; |
| 4364 | old_size = htab->root.table.size; |
| 4365 | old_count = htab->root.table.count; |
| 4366 | old_strtab = _bfd_elf_strtab_save (htab->dynstr); |
| 4367 | if (old_strtab == NULL) |
| 4368 | goto error_free_vers; |
| 4369 | |
| 4370 | for (i = 0; i < htab->root.table.size; i++) |
| 4371 | { |
| 4372 | struct bfd_hash_entry *p; |
| 4373 | struct elf_link_hash_entry *h; |
| 4374 | |
| 4375 | for (p = htab->root.table.table[i]; p != NULL; p = p->next) |
| 4376 | { |
| 4377 | memcpy (old_ent, p, htab->root.table.entsize); |
| 4378 | old_ent = (char *) old_ent + htab->root.table.entsize; |
| 4379 | h = (struct elf_link_hash_entry *) p; |
| 4380 | if (h->root.type == bfd_link_hash_warning) |
| 4381 | { |
| 4382 | memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize); |
| 4383 | old_ent = (char *) old_ent + htab->root.table.entsize; |
| 4384 | } |
| 4385 | } |
| 4386 | } |
| 4387 | } |
| 4388 | |
| 4389 | weaks = NULL; |
| 4390 | if (extversym == NULL) |
| 4391 | ever = NULL; |
| 4392 | else if (extversym + extsymoff < extversym_end) |
| 4393 | ever = extversym + extsymoff; |
| 4394 | else |
| 4395 | { |
| 4396 | /* xgettext:c-format */ |
| 4397 | _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"), |
| 4398 | abfd, (long) extsymoff, |
| 4399 | (long) (extversym_end - extversym) / sizeof (* extversym)); |
| 4400 | bfd_set_error (bfd_error_bad_value); |
| 4401 | goto error_free_vers; |
| 4402 | } |
| 4403 | |
| 4404 | if (abfd->lto_slim_object) |
| 4405 | { |
| 4406 | _bfd_error_handler |
| 4407 | (_("%pB: plugin needed to handle lto object"), abfd); |
| 4408 | } |
| 4409 | |
| 4410 | for (isym = isymbuf, isymend = isymbuf + extsymcount; |
| 4411 | isym < isymend; |
| 4412 | isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL)) |
| 4413 | { |
| 4414 | int bind; |
| 4415 | bfd_vma value; |
| 4416 | asection *sec, *new_sec; |
| 4417 | flagword flags; |
| 4418 | const char *name; |
| 4419 | struct elf_link_hash_entry *h; |
| 4420 | struct elf_link_hash_entry *hi; |
| 4421 | bfd_boolean definition; |
| 4422 | bfd_boolean size_change_ok; |
| 4423 | bfd_boolean type_change_ok; |
| 4424 | bfd_boolean new_weak; |
| 4425 | bfd_boolean old_weak; |
| 4426 | bfd_boolean override; |
| 4427 | bfd_boolean common; |
| 4428 | bfd_boolean discarded; |
| 4429 | unsigned int old_alignment; |
| 4430 | unsigned int shindex; |
| 4431 | bfd *old_bfd; |
| 4432 | bfd_boolean matched; |
| 4433 | |
| 4434 | override = FALSE; |
| 4435 | |
| 4436 | flags = BSF_NO_FLAGS; |
| 4437 | sec = NULL; |
| 4438 | value = isym->st_value; |
| 4439 | common = bed->common_definition (isym); |
| 4440 | if (common && info->inhibit_common_definition) |
| 4441 | { |
| 4442 | /* Treat common symbol as undefined for --no-define-common. */ |
| 4443 | isym->st_shndx = SHN_UNDEF; |
| 4444 | common = FALSE; |
| 4445 | } |
| 4446 | discarded = FALSE; |
| 4447 | |
| 4448 | bind = ELF_ST_BIND (isym->st_info); |
| 4449 | switch (bind) |
| 4450 | { |
| 4451 | case STB_LOCAL: |
| 4452 | /* This should be impossible, since ELF requires that all |
| 4453 | global symbols follow all local symbols, and that sh_info |
| 4454 | point to the first global symbol. Unfortunately, Irix 5 |
| 4455 | screws this up. */ |
| 4456 | if (elf_bad_symtab (abfd)) |
| 4457 | continue; |
| 4458 | |
| 4459 | /* If we aren't prepared to handle locals within the globals |
| 4460 | then we'll likely segfault on a NULL symbol hash if the |
| 4461 | symbol is ever referenced in relocations. */ |
| 4462 | shindex = elf_elfheader (abfd)->e_shstrndx; |
| 4463 | name = bfd_elf_string_from_elf_section (abfd, shindex, hdr->sh_name); |
| 4464 | _bfd_error_handler (_("%pB: %s local symbol at index %lu" |
| 4465 | " (>= sh_info of %lu)"), |
| 4466 | abfd, name, (long) (isym - isymbuf + extsymoff), |
| 4467 | (long) extsymoff); |
| 4468 | |
| 4469 | /* Dynamic object relocations are not processed by ld, so |
| 4470 | ld won't run into the problem mentioned above. */ |
| 4471 | if (dynamic) |
| 4472 | continue; |
| 4473 | bfd_set_error (bfd_error_bad_value); |
| 4474 | goto error_free_vers; |
| 4475 | |
| 4476 | case STB_GLOBAL: |
| 4477 | if (isym->st_shndx != SHN_UNDEF && !common) |
| 4478 | flags = BSF_GLOBAL; |
| 4479 | break; |
| 4480 | |
| 4481 | case STB_WEAK: |
| 4482 | flags = BSF_WEAK; |
| 4483 | break; |
| 4484 | |
| 4485 | case STB_GNU_UNIQUE: |
| 4486 | flags = BSF_GNU_UNIQUE; |
| 4487 | break; |
| 4488 | |
| 4489 | default: |
| 4490 | /* Leave it up to the processor backend. */ |
| 4491 | break; |
| 4492 | } |
| 4493 | |
| 4494 | if (isym->st_shndx == SHN_UNDEF) |
| 4495 | sec = bfd_und_section_ptr; |
| 4496 | else if (isym->st_shndx == SHN_ABS) |
| 4497 | sec = bfd_abs_section_ptr; |
| 4498 | else if (isym->st_shndx == SHN_COMMON) |
| 4499 | { |
| 4500 | sec = bfd_com_section_ptr; |
| 4501 | /* What ELF calls the size we call the value. What ELF |
| 4502 | calls the value we call the alignment. */ |
| 4503 | value = isym->st_size; |
| 4504 | } |
| 4505 | else |
| 4506 | { |
| 4507 | sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 4508 | if (sec == NULL) |
| 4509 | sec = bfd_abs_section_ptr; |
| 4510 | else if (discarded_section (sec)) |
| 4511 | { |
| 4512 | /* Symbols from discarded section are undefined. We keep |
| 4513 | its visibility. */ |
| 4514 | sec = bfd_und_section_ptr; |
| 4515 | discarded = TRUE; |
| 4516 | isym->st_shndx = SHN_UNDEF; |
| 4517 | } |
| 4518 | else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) |
| 4519 | value -= sec->vma; |
| 4520 | } |
| 4521 | |
| 4522 | name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, |
| 4523 | isym->st_name); |
| 4524 | if (name == NULL) |
| 4525 | goto error_free_vers; |
| 4526 | |
| 4527 | if (isym->st_shndx == SHN_COMMON |
| 4528 | && (abfd->flags & BFD_PLUGIN) != 0) |
| 4529 | { |
| 4530 | asection *xc = bfd_get_section_by_name (abfd, "COMMON"); |
| 4531 | |
| 4532 | if (xc == NULL) |
| 4533 | { |
| 4534 | flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP |
| 4535 | | SEC_EXCLUDE); |
| 4536 | xc = bfd_make_section_with_flags (abfd, "COMMON", sflags); |
| 4537 | if (xc == NULL) |
| 4538 | goto error_free_vers; |
| 4539 | } |
| 4540 | sec = xc; |
| 4541 | } |
| 4542 | else if (isym->st_shndx == SHN_COMMON |
| 4543 | && ELF_ST_TYPE (isym->st_info) == STT_TLS |
| 4544 | && !bfd_link_relocatable (info)) |
| 4545 | { |
| 4546 | asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon"); |
| 4547 | |
| 4548 | if (tcomm == NULL) |
| 4549 | { |
| 4550 | flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON |
| 4551 | | SEC_LINKER_CREATED); |
| 4552 | tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags); |
| 4553 | if (tcomm == NULL) |
| 4554 | goto error_free_vers; |
| 4555 | } |
| 4556 | sec = tcomm; |
| 4557 | } |
| 4558 | else if (bed->elf_add_symbol_hook) |
| 4559 | { |
| 4560 | if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags, |
| 4561 | &sec, &value)) |
| 4562 | goto error_free_vers; |
| 4563 | |
| 4564 | /* The hook function sets the name to NULL if this symbol |
| 4565 | should be skipped for some reason. */ |
| 4566 | if (name == NULL) |
| 4567 | continue; |
| 4568 | } |
| 4569 | |
| 4570 | /* Sanity check that all possibilities were handled. */ |
| 4571 | if (sec == NULL) |
| 4572 | abort (); |
| 4573 | |
| 4574 | /* Silently discard TLS symbols from --just-syms. There's |
| 4575 | no way to combine a static TLS block with a new TLS block |
| 4576 | for this executable. */ |
| 4577 | if (ELF_ST_TYPE (isym->st_info) == STT_TLS |
| 4578 | && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS) |
| 4579 | continue; |
| 4580 | |
| 4581 | if (bfd_is_und_section (sec) |
| 4582 | || bfd_is_com_section (sec)) |
| 4583 | definition = FALSE; |
| 4584 | else |
| 4585 | definition = TRUE; |
| 4586 | |
| 4587 | size_change_ok = FALSE; |
| 4588 | type_change_ok = bed->type_change_ok; |
| 4589 | old_weak = FALSE; |
| 4590 | matched = FALSE; |
| 4591 | old_alignment = 0; |
| 4592 | old_bfd = NULL; |
| 4593 | new_sec = sec; |
| 4594 | |
| 4595 | if (is_elf_hash_table (htab)) |
| 4596 | { |
| 4597 | Elf_Internal_Versym iver; |
| 4598 | unsigned int vernum = 0; |
| 4599 | bfd_boolean skip; |
| 4600 | |
| 4601 | if (ever == NULL) |
| 4602 | { |
| 4603 | if (info->default_imported_symver) |
| 4604 | /* Use the default symbol version created earlier. */ |
| 4605 | iver.vs_vers = elf_tdata (abfd)->cverdefs; |
| 4606 | else |
| 4607 | iver.vs_vers = 0; |
| 4608 | } |
| 4609 | else if (ever >= extversym_end) |
| 4610 | { |
| 4611 | /* xgettext:c-format */ |
| 4612 | _bfd_error_handler (_("%pB: not enough version information"), |
| 4613 | abfd); |
| 4614 | bfd_set_error (bfd_error_bad_value); |
| 4615 | goto error_free_vers; |
| 4616 | } |
| 4617 | else |
| 4618 | _bfd_elf_swap_versym_in (abfd, ever, &iver); |
| 4619 | |
| 4620 | vernum = iver.vs_vers & VERSYM_VERSION; |
| 4621 | |
| 4622 | /* If this is a hidden symbol, or if it is not version |
| 4623 | 1, we append the version name to the symbol name. |
| 4624 | However, we do not modify a non-hidden absolute symbol |
| 4625 | if it is not a function, because it might be the version |
| 4626 | symbol itself. FIXME: What if it isn't? */ |
| 4627 | if ((iver.vs_vers & VERSYM_HIDDEN) != 0 |
| 4628 | || (vernum > 1 |
| 4629 | && (!bfd_is_abs_section (sec) |
| 4630 | || bed->is_function_type (ELF_ST_TYPE (isym->st_info))))) |
| 4631 | { |
| 4632 | const char *verstr; |
| 4633 | size_t namelen, verlen, newlen; |
| 4634 | char *newname, *p; |
| 4635 | |
| 4636 | if (isym->st_shndx != SHN_UNDEF) |
| 4637 | { |
| 4638 | if (vernum > elf_tdata (abfd)->cverdefs) |
| 4639 | verstr = NULL; |
| 4640 | else if (vernum > 1) |
| 4641 | verstr = |
| 4642 | elf_tdata (abfd)->verdef[vernum - 1].vd_nodename; |
| 4643 | else |
| 4644 | verstr = ""; |
| 4645 | |
| 4646 | if (verstr == NULL) |
| 4647 | { |
| 4648 | _bfd_error_handler |
| 4649 | /* xgettext:c-format */ |
| 4650 | (_("%pB: %s: invalid version %u (max %d)"), |
| 4651 | abfd, name, vernum, |
| 4652 | elf_tdata (abfd)->cverdefs); |
| 4653 | bfd_set_error (bfd_error_bad_value); |
| 4654 | goto error_free_vers; |
| 4655 | } |
| 4656 | } |
| 4657 | else |
| 4658 | { |
| 4659 | /* We cannot simply test for the number of |
| 4660 | entries in the VERNEED section since the |
| 4661 | numbers for the needed versions do not start |
| 4662 | at 0. */ |
| 4663 | Elf_Internal_Verneed *t; |
| 4664 | |
| 4665 | verstr = NULL; |
| 4666 | for (t = elf_tdata (abfd)->verref; |
| 4667 | t != NULL; |
| 4668 | t = t->vn_nextref) |
| 4669 | { |
| 4670 | Elf_Internal_Vernaux *a; |
| 4671 | |
| 4672 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 4673 | { |
| 4674 | if (a->vna_other == vernum) |
| 4675 | { |
| 4676 | verstr = a->vna_nodename; |
| 4677 | break; |
| 4678 | } |
| 4679 | } |
| 4680 | if (a != NULL) |
| 4681 | break; |
| 4682 | } |
| 4683 | if (verstr == NULL) |
| 4684 | { |
| 4685 | _bfd_error_handler |
| 4686 | /* xgettext:c-format */ |
| 4687 | (_("%pB: %s: invalid needed version %d"), |
| 4688 | abfd, name, vernum); |
| 4689 | bfd_set_error (bfd_error_bad_value); |
| 4690 | goto error_free_vers; |
| 4691 | } |
| 4692 | } |
| 4693 | |
| 4694 | namelen = strlen (name); |
| 4695 | verlen = strlen (verstr); |
| 4696 | newlen = namelen + verlen + 2; |
| 4697 | if ((iver.vs_vers & VERSYM_HIDDEN) == 0 |
| 4698 | && isym->st_shndx != SHN_UNDEF) |
| 4699 | ++newlen; |
| 4700 | |
| 4701 | newname = (char *) bfd_hash_allocate (&htab->root.table, newlen); |
| 4702 | if (newname == NULL) |
| 4703 | goto error_free_vers; |
| 4704 | memcpy (newname, name, namelen); |
| 4705 | p = newname + namelen; |
| 4706 | *p++ = ELF_VER_CHR; |
| 4707 | /* If this is a defined non-hidden version symbol, |
| 4708 | we add another @ to the name. This indicates the |
| 4709 | default version of the symbol. */ |
| 4710 | if ((iver.vs_vers & VERSYM_HIDDEN) == 0 |
| 4711 | && isym->st_shndx != SHN_UNDEF) |
| 4712 | *p++ = ELF_VER_CHR; |
| 4713 | memcpy (p, verstr, verlen + 1); |
| 4714 | |
| 4715 | name = newname; |
| 4716 | } |
| 4717 | |
| 4718 | /* If this symbol has default visibility and the user has |
| 4719 | requested we not re-export it, then mark it as hidden. */ |
| 4720 | if (!bfd_is_und_section (sec) |
| 4721 | && !dynamic |
| 4722 | && abfd->no_export |
| 4723 | && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL) |
| 4724 | isym->st_other = (STV_HIDDEN |
| 4725 | | (isym->st_other & ~ELF_ST_VISIBILITY (-1))); |
| 4726 | |
| 4727 | if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value, |
| 4728 | sym_hash, &old_bfd, &old_weak, |
| 4729 | &old_alignment, &skip, &override, |
| 4730 | &type_change_ok, &size_change_ok, |
| 4731 | &matched)) |
| 4732 | goto error_free_vers; |
| 4733 | |
| 4734 | if (skip) |
| 4735 | continue; |
| 4736 | |
| 4737 | /* Override a definition only if the new symbol matches the |
| 4738 | existing one. */ |
| 4739 | if (override && matched) |
| 4740 | definition = FALSE; |
| 4741 | |
| 4742 | h = *sym_hash; |
| 4743 | while (h->root.type == bfd_link_hash_indirect |
| 4744 | || h->root.type == bfd_link_hash_warning) |
| 4745 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 4746 | |
| 4747 | if (elf_tdata (abfd)->verdef != NULL |
| 4748 | && vernum > 1 |
| 4749 | && definition) |
| 4750 | h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1]; |
| 4751 | } |
| 4752 | |
| 4753 | if (! (_bfd_generic_link_add_one_symbol |
| 4754 | (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect, |
| 4755 | (struct bfd_link_hash_entry **) sym_hash))) |
| 4756 | goto error_free_vers; |
| 4757 | |
| 4758 | h = *sym_hash; |
| 4759 | /* We need to make sure that indirect symbol dynamic flags are |
| 4760 | updated. */ |
| 4761 | hi = h; |
| 4762 | while (h->root.type == bfd_link_hash_indirect |
| 4763 | || h->root.type == bfd_link_hash_warning) |
| 4764 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 4765 | |
| 4766 | /* Setting the index to -3 tells elf_link_output_extsym that |
| 4767 | this symbol is defined in a discarded section. */ |
| 4768 | if (discarded) |
| 4769 | h->indx = -3; |
| 4770 | |
| 4771 | *sym_hash = h; |
| 4772 | |
| 4773 | new_weak = (flags & BSF_WEAK) != 0; |
| 4774 | if (dynamic |
| 4775 | && definition |
| 4776 | && new_weak |
| 4777 | && !bed->is_function_type (ELF_ST_TYPE (isym->st_info)) |
| 4778 | && is_elf_hash_table (htab) |
| 4779 | && h->u.alias == NULL) |
| 4780 | { |
| 4781 | /* Keep a list of all weak defined non function symbols from |
| 4782 | a dynamic object, using the alias field. Later in this |
| 4783 | function we will set the alias field to the correct |
| 4784 | value. We only put non-function symbols from dynamic |
| 4785 | objects on this list, because that happens to be the only |
| 4786 | time we need to know the normal symbol corresponding to a |
| 4787 | weak symbol, and the information is time consuming to |
| 4788 | figure out. If the alias field is not already NULL, |
| 4789 | then this symbol was already defined by some previous |
| 4790 | dynamic object, and we will be using that previous |
| 4791 | definition anyhow. */ |
| 4792 | |
| 4793 | h->u.alias = weaks; |
| 4794 | weaks = h; |
| 4795 | } |
| 4796 | |
| 4797 | /* Set the alignment of a common symbol. */ |
| 4798 | if ((common || bfd_is_com_section (sec)) |
| 4799 | && h->root.type == bfd_link_hash_common) |
| 4800 | { |
| 4801 | unsigned int align; |
| 4802 | |
| 4803 | if (common) |
| 4804 | align = bfd_log2 (isym->st_value); |
| 4805 | else |
| 4806 | { |
| 4807 | /* The new symbol is a common symbol in a shared object. |
| 4808 | We need to get the alignment from the section. */ |
| 4809 | align = new_sec->alignment_power; |
| 4810 | } |
| 4811 | if (align > old_alignment) |
| 4812 | h->root.u.c.p->alignment_power = align; |
| 4813 | else |
| 4814 | h->root.u.c.p->alignment_power = old_alignment; |
| 4815 | } |
| 4816 | |
| 4817 | if (is_elf_hash_table (htab)) |
| 4818 | { |
| 4819 | /* Set a flag in the hash table entry indicating the type of |
| 4820 | reference or definition we just found. A dynamic symbol |
| 4821 | is one which is referenced or defined by both a regular |
| 4822 | object and a shared object. */ |
| 4823 | bfd_boolean dynsym = FALSE; |
| 4824 | |
| 4825 | /* Plugin symbols aren't normal. Don't set def_regular or |
| 4826 | ref_regular for them, or make them dynamic. */ |
| 4827 | if ((abfd->flags & BFD_PLUGIN) != 0) |
| 4828 | ; |
| 4829 | else if (! dynamic) |
| 4830 | { |
| 4831 | if (! definition) |
| 4832 | { |
| 4833 | h->ref_regular = 1; |
| 4834 | if (bind != STB_WEAK) |
| 4835 | h->ref_regular_nonweak = 1; |
| 4836 | } |
| 4837 | else |
| 4838 | { |
| 4839 | h->def_regular = 1; |
| 4840 | if (h->def_dynamic) |
| 4841 | { |
| 4842 | h->def_dynamic = 0; |
| 4843 | h->ref_dynamic = 1; |
| 4844 | } |
| 4845 | } |
| 4846 | |
| 4847 | /* If the indirect symbol has been forced local, don't |
| 4848 | make the real symbol dynamic. */ |
| 4849 | if ((h == hi || !hi->forced_local) |
| 4850 | && (bfd_link_dll (info) |
| 4851 | || h->def_dynamic |
| 4852 | || h->ref_dynamic)) |
| 4853 | dynsym = TRUE; |
| 4854 | } |
| 4855 | else |
| 4856 | { |
| 4857 | if (! definition) |
| 4858 | { |
| 4859 | h->ref_dynamic = 1; |
| 4860 | hi->ref_dynamic = 1; |
| 4861 | } |
| 4862 | else |
| 4863 | { |
| 4864 | h->def_dynamic = 1; |
| 4865 | hi->def_dynamic = 1; |
| 4866 | } |
| 4867 | |
| 4868 | /* If the indirect symbol has been forced local, don't |
| 4869 | make the real symbol dynamic. */ |
| 4870 | if ((h == hi || !hi->forced_local) |
| 4871 | && (h->def_regular |
| 4872 | || h->ref_regular |
| 4873 | || (h->is_weakalias |
| 4874 | && weakdef (h)->dynindx != -1))) |
| 4875 | dynsym = TRUE; |
| 4876 | } |
| 4877 | |
| 4878 | /* Check to see if we need to add an indirect symbol for |
| 4879 | the default name. */ |
| 4880 | if (definition |
| 4881 | || (!override && h->root.type == bfd_link_hash_common)) |
| 4882 | if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym, |
| 4883 | sec, value, &old_bfd, &dynsym)) |
| 4884 | goto error_free_vers; |
| 4885 | |
| 4886 | /* Check the alignment when a common symbol is involved. This |
| 4887 | can change when a common symbol is overridden by a normal |
| 4888 | definition or a common symbol is ignored due to the old |
| 4889 | normal definition. We need to make sure the maximum |
| 4890 | alignment is maintained. */ |
| 4891 | if ((old_alignment || common) |
| 4892 | && h->root.type != bfd_link_hash_common) |
| 4893 | { |
| 4894 | unsigned int common_align; |
| 4895 | unsigned int normal_align; |
| 4896 | unsigned int symbol_align; |
| 4897 | bfd *normal_bfd; |
| 4898 | bfd *common_bfd; |
| 4899 | |
| 4900 | BFD_ASSERT (h->root.type == bfd_link_hash_defined |
| 4901 | || h->root.type == bfd_link_hash_defweak); |
| 4902 | |
| 4903 | symbol_align = ffs (h->root.u.def.value) - 1; |
| 4904 | if (h->root.u.def.section->owner != NULL |
| 4905 | && (h->root.u.def.section->owner->flags |
| 4906 | & (DYNAMIC | BFD_PLUGIN)) == 0) |
| 4907 | { |
| 4908 | normal_align = h->root.u.def.section->alignment_power; |
| 4909 | if (normal_align > symbol_align) |
| 4910 | normal_align = symbol_align; |
| 4911 | } |
| 4912 | else |
| 4913 | normal_align = symbol_align; |
| 4914 | |
| 4915 | if (old_alignment) |
| 4916 | { |
| 4917 | common_align = old_alignment; |
| 4918 | common_bfd = old_bfd; |
| 4919 | normal_bfd = abfd; |
| 4920 | } |
| 4921 | else |
| 4922 | { |
| 4923 | common_align = bfd_log2 (isym->st_value); |
| 4924 | common_bfd = abfd; |
| 4925 | normal_bfd = old_bfd; |
| 4926 | } |
| 4927 | |
| 4928 | if (normal_align < common_align) |
| 4929 | { |
| 4930 | /* PR binutils/2735 */ |
| 4931 | if (normal_bfd == NULL) |
| 4932 | _bfd_error_handler |
| 4933 | /* xgettext:c-format */ |
| 4934 | (_("warning: alignment %u of common symbol `%s' in %pB is" |
| 4935 | " greater than the alignment (%u) of its section %pA"), |
| 4936 | 1 << common_align, name, common_bfd, |
| 4937 | 1 << normal_align, h->root.u.def.section); |
| 4938 | else |
| 4939 | _bfd_error_handler |
| 4940 | /* xgettext:c-format */ |
| 4941 | (_("warning: alignment %u of symbol `%s' in %pB" |
| 4942 | " is smaller than %u in %pB"), |
| 4943 | 1 << normal_align, name, normal_bfd, |
| 4944 | 1 << common_align, common_bfd); |
| 4945 | } |
| 4946 | } |
| 4947 | |
| 4948 | /* Remember the symbol size if it isn't undefined. */ |
| 4949 | if (isym->st_size != 0 |
| 4950 | && isym->st_shndx != SHN_UNDEF |
| 4951 | && (definition || h->size == 0)) |
| 4952 | { |
| 4953 | if (h->size != 0 |
| 4954 | && h->size != isym->st_size |
| 4955 | && ! size_change_ok) |
| 4956 | _bfd_error_handler |
| 4957 | /* xgettext:c-format */ |
| 4958 | (_("warning: size of symbol `%s' changed" |
| 4959 | " from %" PRIu64 " in %pB to %" PRIu64 " in %pB"), |
| 4960 | name, (uint64_t) h->size, old_bfd, |
| 4961 | (uint64_t) isym->st_size, abfd); |
| 4962 | |
| 4963 | h->size = isym->st_size; |
| 4964 | } |
| 4965 | |
| 4966 | /* If this is a common symbol, then we always want H->SIZE |
| 4967 | to be the size of the common symbol. The code just above |
| 4968 | won't fix the size if a common symbol becomes larger. We |
| 4969 | don't warn about a size change here, because that is |
| 4970 | covered by --warn-common. Allow changes between different |
| 4971 | function types. */ |
| 4972 | if (h->root.type == bfd_link_hash_common) |
| 4973 | h->size = h->root.u.c.size; |
| 4974 | |
| 4975 | if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE |
| 4976 | && ((definition && !new_weak) |
| 4977 | || (old_weak && h->root.type == bfd_link_hash_common) |
| 4978 | || h->type == STT_NOTYPE)) |
| 4979 | { |
| 4980 | unsigned int type = ELF_ST_TYPE (isym->st_info); |
| 4981 | |
| 4982 | /* Turn an IFUNC symbol from a DSO into a normal FUNC |
| 4983 | symbol. */ |
| 4984 | if (type == STT_GNU_IFUNC |
| 4985 | && (abfd->flags & DYNAMIC) != 0) |
| 4986 | type = STT_FUNC; |
| 4987 | |
| 4988 | if (h->type != type) |
| 4989 | { |
| 4990 | if (h->type != STT_NOTYPE && ! type_change_ok) |
| 4991 | /* xgettext:c-format */ |
| 4992 | _bfd_error_handler |
| 4993 | (_("warning: type of symbol `%s' changed" |
| 4994 | " from %d to %d in %pB"), |
| 4995 | name, h->type, type, abfd); |
| 4996 | |
| 4997 | h->type = type; |
| 4998 | } |
| 4999 | } |
| 5000 | |
| 5001 | /* Merge st_other field. */ |
| 5002 | elf_merge_st_other (abfd, h, isym, sec, definition, dynamic); |
| 5003 | |
| 5004 | /* We don't want to make debug symbol dynamic. */ |
| 5005 | if (definition |
| 5006 | && (sec->flags & SEC_DEBUGGING) |
| 5007 | && !bfd_link_relocatable (info)) |
| 5008 | dynsym = FALSE; |
| 5009 | |
| 5010 | /* Nor should we make plugin symbols dynamic. */ |
| 5011 | if ((abfd->flags & BFD_PLUGIN) != 0) |
| 5012 | dynsym = FALSE; |
| 5013 | |
| 5014 | if (definition) |
| 5015 | { |
| 5016 | h->target_internal = isym->st_target_internal; |
| 5017 | h->unique_global = (flags & BSF_GNU_UNIQUE) != 0; |
| 5018 | } |
| 5019 | |
| 5020 | if (definition && !dynamic) |
| 5021 | { |
| 5022 | char *p = strchr (name, ELF_VER_CHR); |
| 5023 | if (p != NULL && p[1] != ELF_VER_CHR) |
| 5024 | { |
| 5025 | /* Queue non-default versions so that .symver x, x@FOO |
| 5026 | aliases can be checked. */ |
| 5027 | if (!nondeflt_vers) |
| 5028 | { |
| 5029 | amt = ((isymend - isym + 1) |
| 5030 | * sizeof (struct elf_link_hash_entry *)); |
| 5031 | nondeflt_vers |
| 5032 | = (struct elf_link_hash_entry **) bfd_malloc (amt); |
| 5033 | if (!nondeflt_vers) |
| 5034 | goto error_free_vers; |
| 5035 | } |
| 5036 | nondeflt_vers[nondeflt_vers_cnt++] = h; |
| 5037 | } |
| 5038 | } |
| 5039 | |
| 5040 | if (dynsym && h->dynindx == -1) |
| 5041 | { |
| 5042 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 5043 | goto error_free_vers; |
| 5044 | if (h->is_weakalias |
| 5045 | && weakdef (h)->dynindx == -1) |
| 5046 | { |
| 5047 | if (!bfd_elf_link_record_dynamic_symbol (info, weakdef (h))) |
| 5048 | goto error_free_vers; |
| 5049 | } |
| 5050 | } |
| 5051 | else if (h->dynindx != -1) |
| 5052 | /* If the symbol already has a dynamic index, but |
| 5053 | visibility says it should not be visible, turn it into |
| 5054 | a local symbol. */ |
| 5055 | switch (ELF_ST_VISIBILITY (h->other)) |
| 5056 | { |
| 5057 | case STV_INTERNAL: |
| 5058 | case STV_HIDDEN: |
| 5059 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 5060 | dynsym = FALSE; |
| 5061 | break; |
| 5062 | } |
| 5063 | |
| 5064 | /* Don't add DT_NEEDED for references from the dummy bfd nor |
| 5065 | for unmatched symbol. */ |
| 5066 | if (!add_needed |
| 5067 | && matched |
| 5068 | && definition |
| 5069 | && ((dynsym |
| 5070 | && h->ref_regular_nonweak |
| 5071 | && (old_bfd == NULL |
| 5072 | || (old_bfd->flags & BFD_PLUGIN) == 0)) |
| 5073 | || (h->ref_dynamic_nonweak |
| 5074 | && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0 |
| 5075 | && !on_needed_list (elf_dt_name (abfd), |
| 5076 | htab->needed, NULL)))) |
| 5077 | { |
| 5078 | int ret; |
| 5079 | const char *soname = elf_dt_name (abfd); |
| 5080 | |
| 5081 | info->callbacks->minfo ("%!", soname, old_bfd, |
| 5082 | h->root.root.string); |
| 5083 | |
| 5084 | /* A symbol from a library loaded via DT_NEEDED of some |
| 5085 | other library is referenced by a regular object. |
| 5086 | Add a DT_NEEDED entry for it. Issue an error if |
| 5087 | --no-add-needed is used and the reference was not |
| 5088 | a weak one. */ |
| 5089 | if (old_bfd != NULL |
| 5090 | && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0) |
| 5091 | { |
| 5092 | _bfd_error_handler |
| 5093 | /* xgettext:c-format */ |
| 5094 | (_("%pB: undefined reference to symbol '%s'"), |
| 5095 | old_bfd, name); |
| 5096 | bfd_set_error (bfd_error_missing_dso); |
| 5097 | goto error_free_vers; |
| 5098 | } |
| 5099 | |
| 5100 | elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class) |
| 5101 | (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED); |
| 5102 | |
| 5103 | add_needed = TRUE; |
| 5104 | ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed); |
| 5105 | if (ret < 0) |
| 5106 | goto error_free_vers; |
| 5107 | |
| 5108 | BFD_ASSERT (ret == 0); |
| 5109 | } |
| 5110 | } |
| 5111 | } |
| 5112 | |
| 5113 | if (info->lto_plugin_active |
| 5114 | && !bfd_link_relocatable (info) |
| 5115 | && (abfd->flags & BFD_PLUGIN) == 0 |
| 5116 | && !just_syms |
| 5117 | && extsymcount) |
| 5118 | { |
| 5119 | int r_sym_shift; |
| 5120 | |
| 5121 | if (bed->s->arch_size == 32) |
| 5122 | r_sym_shift = 8; |
| 5123 | else |
| 5124 | r_sym_shift = 32; |
| 5125 | |
| 5126 | /* If linker plugin is enabled, set non_ir_ref_regular on symbols |
| 5127 | referenced in regular objects so that linker plugin will get |
| 5128 | the correct symbol resolution. */ |
| 5129 | |
| 5130 | sym_hash = elf_sym_hashes (abfd); |
| 5131 | for (s = abfd->sections; s != NULL; s = s->next) |
| 5132 | { |
| 5133 | Elf_Internal_Rela *internal_relocs; |
| 5134 | Elf_Internal_Rela *rel, *relend; |
| 5135 | |
| 5136 | /* Don't check relocations in excluded sections. */ |
| 5137 | if ((s->flags & SEC_RELOC) == 0 |
| 5138 | || s->reloc_count == 0 |
| 5139 | || (s->flags & SEC_EXCLUDE) != 0 |
| 5140 | || ((info->strip == strip_all |
| 5141 | || info->strip == strip_debugger) |
| 5142 | && (s->flags & SEC_DEBUGGING) != 0)) |
| 5143 | continue; |
| 5144 | |
| 5145 | internal_relocs = _bfd_elf_link_read_relocs (abfd, s, NULL, |
| 5146 | NULL, |
| 5147 | info->keep_memory); |
| 5148 | if (internal_relocs == NULL) |
| 5149 | goto error_free_vers; |
| 5150 | |
| 5151 | rel = internal_relocs; |
| 5152 | relend = rel + s->reloc_count; |
| 5153 | for ( ; rel < relend; rel++) |
| 5154 | { |
| 5155 | unsigned long r_symndx = rel->r_info >> r_sym_shift; |
| 5156 | struct elf_link_hash_entry *h; |
| 5157 | |
| 5158 | /* Skip local symbols. */ |
| 5159 | if (r_symndx < extsymoff) |
| 5160 | continue; |
| 5161 | |
| 5162 | h = sym_hash[r_symndx - extsymoff]; |
| 5163 | if (h != NULL) |
| 5164 | h->root.non_ir_ref_regular = 1; |
| 5165 | } |
| 5166 | |
| 5167 | if (elf_section_data (s)->relocs != internal_relocs) |
| 5168 | free (internal_relocs); |
| 5169 | } |
| 5170 | } |
| 5171 | |
| 5172 | if (extversym != NULL) |
| 5173 | { |
| 5174 | free (extversym); |
| 5175 | extversym = NULL; |
| 5176 | } |
| 5177 | |
| 5178 | if (isymbuf != NULL) |
| 5179 | { |
| 5180 | free (isymbuf); |
| 5181 | isymbuf = NULL; |
| 5182 | } |
| 5183 | |
| 5184 | if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0) |
| 5185 | { |
| 5186 | unsigned int i; |
| 5187 | |
| 5188 | /* Restore the symbol table. */ |
| 5189 | old_ent = (char *) old_tab + tabsize; |
| 5190 | memset (elf_sym_hashes (abfd), 0, |
| 5191 | extsymcount * sizeof (struct elf_link_hash_entry *)); |
| 5192 | htab->root.table.table = old_table; |
| 5193 | htab->root.table.size = old_size; |
| 5194 | htab->root.table.count = old_count; |
| 5195 | memcpy (htab->root.table.table, old_tab, tabsize); |
| 5196 | htab->root.undefs = old_undefs; |
| 5197 | htab->root.undefs_tail = old_undefs_tail; |
| 5198 | _bfd_elf_strtab_restore (htab->dynstr, old_strtab); |
| 5199 | free (old_strtab); |
| 5200 | old_strtab = NULL; |
| 5201 | for (i = 0; i < htab->root.table.size; i++) |
| 5202 | { |
| 5203 | struct bfd_hash_entry *p; |
| 5204 | struct elf_link_hash_entry *h; |
| 5205 | bfd_size_type size; |
| 5206 | unsigned int alignment_power; |
| 5207 | unsigned int non_ir_ref_dynamic; |
| 5208 | |
| 5209 | for (p = htab->root.table.table[i]; p != NULL; p = p->next) |
| 5210 | { |
| 5211 | h = (struct elf_link_hash_entry *) p; |
| 5212 | if (h->root.type == bfd_link_hash_warning) |
| 5213 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 5214 | |
| 5215 | /* Preserve the maximum alignment and size for common |
| 5216 | symbols even if this dynamic lib isn't on DT_NEEDED |
| 5217 | since it can still be loaded at run time by another |
| 5218 | dynamic lib. */ |
| 5219 | if (h->root.type == bfd_link_hash_common) |
| 5220 | { |
| 5221 | size = h->root.u.c.size; |
| 5222 | alignment_power = h->root.u.c.p->alignment_power; |
| 5223 | } |
| 5224 | else |
| 5225 | { |
| 5226 | size = 0; |
| 5227 | alignment_power = 0; |
| 5228 | } |
| 5229 | /* Preserve non_ir_ref_dynamic so that this symbol |
| 5230 | will be exported when the dynamic lib becomes needed |
| 5231 | in the second pass. */ |
| 5232 | non_ir_ref_dynamic = h->root.non_ir_ref_dynamic; |
| 5233 | memcpy (p, old_ent, htab->root.table.entsize); |
| 5234 | old_ent = (char *) old_ent + htab->root.table.entsize; |
| 5235 | h = (struct elf_link_hash_entry *) p; |
| 5236 | if (h->root.type == bfd_link_hash_warning) |
| 5237 | { |
| 5238 | memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize); |
| 5239 | old_ent = (char *) old_ent + htab->root.table.entsize; |
| 5240 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 5241 | } |
| 5242 | if (h->root.type == bfd_link_hash_common) |
| 5243 | { |
| 5244 | if (size > h->root.u.c.size) |
| 5245 | h->root.u.c.size = size; |
| 5246 | if (alignment_power > h->root.u.c.p->alignment_power) |
| 5247 | h->root.u.c.p->alignment_power = alignment_power; |
| 5248 | } |
| 5249 | h->root.non_ir_ref_dynamic = non_ir_ref_dynamic; |
| 5250 | } |
| 5251 | } |
| 5252 | |
| 5253 | /* Make a special call to the linker "notice" function to |
| 5254 | tell it that symbols added for crefs may need to be removed. */ |
| 5255 | if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed)) |
| 5256 | goto error_free_vers; |
| 5257 | |
| 5258 | free (old_tab); |
| 5259 | objalloc_free_block ((struct objalloc *) htab->root.table.memory, |
| 5260 | alloc_mark); |
| 5261 | if (nondeflt_vers != NULL) |
| 5262 | free (nondeflt_vers); |
| 5263 | return TRUE; |
| 5264 | } |
| 5265 | |
| 5266 | if (old_tab != NULL) |
| 5267 | { |
| 5268 | if (!(*bed->notice_as_needed) (abfd, info, notice_needed)) |
| 5269 | goto error_free_vers; |
| 5270 | free (old_tab); |
| 5271 | old_tab = NULL; |
| 5272 | } |
| 5273 | |
| 5274 | /* Now that all the symbols from this input file are created, if |
| 5275 | not performing a relocatable link, handle .symver foo, foo@BAR |
| 5276 | such that any relocs against foo become foo@BAR. */ |
| 5277 | if (!bfd_link_relocatable (info) && nondeflt_vers != NULL) |
| 5278 | { |
| 5279 | size_t cnt, symidx; |
| 5280 | |
| 5281 | for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt) |
| 5282 | { |
| 5283 | struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi; |
| 5284 | char *shortname, *p; |
| 5285 | |
| 5286 | p = strchr (h->root.root.string, ELF_VER_CHR); |
| 5287 | if (p == NULL |
| 5288 | || (h->root.type != bfd_link_hash_defined |
| 5289 | && h->root.type != bfd_link_hash_defweak)) |
| 5290 | continue; |
| 5291 | |
| 5292 | amt = p - h->root.root.string; |
| 5293 | shortname = (char *) bfd_malloc (amt + 1); |
| 5294 | if (!shortname) |
| 5295 | goto error_free_vers; |
| 5296 | memcpy (shortname, h->root.root.string, amt); |
| 5297 | shortname[amt] = '\0'; |
| 5298 | |
| 5299 | hi = (struct elf_link_hash_entry *) |
| 5300 | bfd_link_hash_lookup (&htab->root, shortname, |
| 5301 | FALSE, FALSE, FALSE); |
| 5302 | if (hi != NULL |
| 5303 | && hi->root.type == h->root.type |
| 5304 | && hi->root.u.def.value == h->root.u.def.value |
| 5305 | && hi->root.u.def.section == h->root.u.def.section) |
| 5306 | { |
| 5307 | (*bed->elf_backend_hide_symbol) (info, hi, TRUE); |
| 5308 | hi->root.type = bfd_link_hash_indirect; |
| 5309 | hi->root.u.i.link = (struct bfd_link_hash_entry *) h; |
| 5310 | (*bed->elf_backend_copy_indirect_symbol) (info, h, hi); |
| 5311 | sym_hash = elf_sym_hashes (abfd); |
| 5312 | if (sym_hash) |
| 5313 | for (symidx = 0; symidx < extsymcount; ++symidx) |
| 5314 | if (sym_hash[symidx] == hi) |
| 5315 | { |
| 5316 | sym_hash[symidx] = h; |
| 5317 | break; |
| 5318 | } |
| 5319 | } |
| 5320 | free (shortname); |
| 5321 | } |
| 5322 | free (nondeflt_vers); |
| 5323 | nondeflt_vers = NULL; |
| 5324 | } |
| 5325 | |
| 5326 | /* Now set the alias field correctly for all the weak defined |
| 5327 | symbols we found. The only way to do this is to search all the |
| 5328 | symbols. Since we only need the information for non functions in |
| 5329 | dynamic objects, that's the only time we actually put anything on |
| 5330 | the list WEAKS. We need this information so that if a regular |
| 5331 | object refers to a symbol defined weakly in a dynamic object, the |
| 5332 | real symbol in the dynamic object is also put in the dynamic |
| 5333 | symbols; we also must arrange for both symbols to point to the |
| 5334 | same memory location. We could handle the general case of symbol |
| 5335 | aliasing, but a general symbol alias can only be generated in |
| 5336 | assembler code, handling it correctly would be very time |
| 5337 | consuming, and other ELF linkers don't handle general aliasing |
| 5338 | either. */ |
| 5339 | if (weaks != NULL) |
| 5340 | { |
| 5341 | struct elf_link_hash_entry **hpp; |
| 5342 | struct elf_link_hash_entry **hppend; |
| 5343 | struct elf_link_hash_entry **sorted_sym_hash; |
| 5344 | struct elf_link_hash_entry *h; |
| 5345 | size_t sym_count; |
| 5346 | |
| 5347 | /* Since we have to search the whole symbol list for each weak |
| 5348 | defined symbol, search time for N weak defined symbols will be |
| 5349 | O(N^2). Binary search will cut it down to O(NlogN). */ |
| 5350 | amt = extsymcount; |
| 5351 | amt *= sizeof (struct elf_link_hash_entry *); |
| 5352 | sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt); |
| 5353 | if (sorted_sym_hash == NULL) |
| 5354 | goto error_return; |
| 5355 | sym_hash = sorted_sym_hash; |
| 5356 | hpp = elf_sym_hashes (abfd); |
| 5357 | hppend = hpp + extsymcount; |
| 5358 | sym_count = 0; |
| 5359 | for (; hpp < hppend; hpp++) |
| 5360 | { |
| 5361 | h = *hpp; |
| 5362 | if (h != NULL |
| 5363 | && h->root.type == bfd_link_hash_defined |
| 5364 | && !bed->is_function_type (h->type)) |
| 5365 | { |
| 5366 | *sym_hash = h; |
| 5367 | sym_hash++; |
| 5368 | sym_count++; |
| 5369 | } |
| 5370 | } |
| 5371 | |
| 5372 | qsort (sorted_sym_hash, sym_count, |
| 5373 | sizeof (struct elf_link_hash_entry *), |
| 5374 | elf_sort_symbol); |
| 5375 | |
| 5376 | while (weaks != NULL) |
| 5377 | { |
| 5378 | struct elf_link_hash_entry *hlook; |
| 5379 | asection *slook; |
| 5380 | bfd_vma vlook; |
| 5381 | size_t i, j, idx = 0; |
| 5382 | |
| 5383 | hlook = weaks; |
| 5384 | weaks = hlook->u.alias; |
| 5385 | hlook->u.alias = NULL; |
| 5386 | |
| 5387 | if (hlook->root.type != bfd_link_hash_defined |
| 5388 | && hlook->root.type != bfd_link_hash_defweak) |
| 5389 | continue; |
| 5390 | |
| 5391 | slook = hlook->root.u.def.section; |
| 5392 | vlook = hlook->root.u.def.value; |
| 5393 | |
| 5394 | i = 0; |
| 5395 | j = sym_count; |
| 5396 | while (i != j) |
| 5397 | { |
| 5398 | bfd_signed_vma vdiff; |
| 5399 | idx = (i + j) / 2; |
| 5400 | h = sorted_sym_hash[idx]; |
| 5401 | vdiff = vlook - h->root.u.def.value; |
| 5402 | if (vdiff < 0) |
| 5403 | j = idx; |
| 5404 | else if (vdiff > 0) |
| 5405 | i = idx + 1; |
| 5406 | else |
| 5407 | { |
| 5408 | int sdiff = slook->id - h->root.u.def.section->id; |
| 5409 | if (sdiff < 0) |
| 5410 | j = idx; |
| 5411 | else if (sdiff > 0) |
| 5412 | i = idx + 1; |
| 5413 | else |
| 5414 | break; |
| 5415 | } |
| 5416 | } |
| 5417 | |
| 5418 | /* We didn't find a value/section match. */ |
| 5419 | if (i == j) |
| 5420 | continue; |
| 5421 | |
| 5422 | /* With multiple aliases, or when the weak symbol is already |
| 5423 | strongly defined, we have multiple matching symbols and |
| 5424 | the binary search above may land on any of them. Step |
| 5425 | one past the matching symbol(s). */ |
| 5426 | while (++idx != j) |
| 5427 | { |
| 5428 | h = sorted_sym_hash[idx]; |
| 5429 | if (h->root.u.def.section != slook |
| 5430 | || h->root.u.def.value != vlook) |
| 5431 | break; |
| 5432 | } |
| 5433 | |
| 5434 | /* Now look back over the aliases. Since we sorted by size |
| 5435 | as well as value and section, we'll choose the one with |
| 5436 | the largest size. */ |
| 5437 | while (idx-- != i) |
| 5438 | { |
| 5439 | h = sorted_sym_hash[idx]; |
| 5440 | |
| 5441 | /* Stop if value or section doesn't match. */ |
| 5442 | if (h->root.u.def.section != slook |
| 5443 | || h->root.u.def.value != vlook) |
| 5444 | break; |
| 5445 | else if (h != hlook) |
| 5446 | { |
| 5447 | struct elf_link_hash_entry *t; |
| 5448 | |
| 5449 | hlook->u.alias = h; |
| 5450 | hlook->is_weakalias = 1; |
| 5451 | t = h; |
| 5452 | if (t->u.alias != NULL) |
| 5453 | while (t->u.alias != h) |
| 5454 | t = t->u.alias; |
| 5455 | t->u.alias = hlook; |
| 5456 | |
| 5457 | /* If the weak definition is in the list of dynamic |
| 5458 | symbols, make sure the real definition is put |
| 5459 | there as well. */ |
| 5460 | if (hlook->dynindx != -1 && h->dynindx == -1) |
| 5461 | { |
| 5462 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 5463 | { |
| 5464 | err_free_sym_hash: |
| 5465 | free (sorted_sym_hash); |
| 5466 | goto error_return; |
| 5467 | } |
| 5468 | } |
| 5469 | |
| 5470 | /* If the real definition is in the list of dynamic |
| 5471 | symbols, make sure the weak definition is put |
| 5472 | there as well. If we don't do this, then the |
| 5473 | dynamic loader might not merge the entries for the |
| 5474 | real definition and the weak definition. */ |
| 5475 | if (h->dynindx != -1 && hlook->dynindx == -1) |
| 5476 | { |
| 5477 | if (! bfd_elf_link_record_dynamic_symbol (info, hlook)) |
| 5478 | goto err_free_sym_hash; |
| 5479 | } |
| 5480 | break; |
| 5481 | } |
| 5482 | } |
| 5483 | } |
| 5484 | |
| 5485 | free (sorted_sym_hash); |
| 5486 | } |
| 5487 | |
| 5488 | if (bed->check_directives |
| 5489 | && !(*bed->check_directives) (abfd, info)) |
| 5490 | return FALSE; |
| 5491 | |
| 5492 | /* If this is a non-traditional link, try to optimize the handling |
| 5493 | of the .stab/.stabstr sections. */ |
| 5494 | if (! dynamic |
| 5495 | && ! info->traditional_format |
| 5496 | && is_elf_hash_table (htab) |
| 5497 | && (info->strip != strip_all && info->strip != strip_debugger)) |
| 5498 | { |
| 5499 | asection *stabstr; |
| 5500 | |
| 5501 | stabstr = bfd_get_section_by_name (abfd, ".stabstr"); |
| 5502 | if (stabstr != NULL) |
| 5503 | { |
| 5504 | bfd_size_type string_offset = 0; |
| 5505 | asection *stab; |
| 5506 | |
| 5507 | for (stab = abfd->sections; stab; stab = stab->next) |
| 5508 | if (CONST_STRNEQ (stab->name, ".stab") |
| 5509 | && (!stab->name[5] || |
| 5510 | (stab->name[5] == '.' && ISDIGIT (stab->name[6]))) |
| 5511 | && (stab->flags & SEC_MERGE) == 0 |
| 5512 | && !bfd_is_abs_section (stab->output_section)) |
| 5513 | { |
| 5514 | struct bfd_elf_section_data *secdata; |
| 5515 | |
| 5516 | secdata = elf_section_data (stab); |
| 5517 | if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab, |
| 5518 | stabstr, &secdata->sec_info, |
| 5519 | &string_offset)) |
| 5520 | goto error_return; |
| 5521 | if (secdata->sec_info) |
| 5522 | stab->sec_info_type = SEC_INFO_TYPE_STABS; |
| 5523 | } |
| 5524 | } |
| 5525 | } |
| 5526 | |
| 5527 | if (is_elf_hash_table (htab) && add_needed) |
| 5528 | { |
| 5529 | /* Add this bfd to the loaded list. */ |
| 5530 | struct elf_link_loaded_list *n; |
| 5531 | |
| 5532 | n = (struct elf_link_loaded_list *) bfd_alloc (abfd, sizeof (*n)); |
| 5533 | if (n == NULL) |
| 5534 | goto error_return; |
| 5535 | n->abfd = abfd; |
| 5536 | n->next = htab->loaded; |
| 5537 | htab->loaded = n; |
| 5538 | } |
| 5539 | |
| 5540 | return TRUE; |
| 5541 | |
| 5542 | error_free_vers: |
| 5543 | if (old_tab != NULL) |
| 5544 | free (old_tab); |
| 5545 | if (old_strtab != NULL) |
| 5546 | free (old_strtab); |
| 5547 | if (nondeflt_vers != NULL) |
| 5548 | free (nondeflt_vers); |
| 5549 | if (extversym != NULL) |
| 5550 | free (extversym); |
| 5551 | error_free_sym: |
| 5552 | if (isymbuf != NULL) |
| 5553 | free (isymbuf); |
| 5554 | error_return: |
| 5555 | return FALSE; |
| 5556 | } |
| 5557 | |
| 5558 | /* Return the linker hash table entry of a symbol that might be |
| 5559 | satisfied by an archive symbol. Return -1 on error. */ |
| 5560 | |
| 5561 | struct elf_link_hash_entry * |
| 5562 | _bfd_elf_archive_symbol_lookup (bfd *abfd, |
| 5563 | struct bfd_link_info *info, |
| 5564 | const char *name) |
| 5565 | { |
| 5566 | struct elf_link_hash_entry *h; |
| 5567 | char *p, *copy; |
| 5568 | size_t len, first; |
| 5569 | |
| 5570 | h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE); |
| 5571 | if (h != NULL) |
| 5572 | return h; |
| 5573 | |
| 5574 | /* If this is a default version (the name contains @@), look up the |
| 5575 | symbol again with only one `@' as well as without the version. |
| 5576 | The effect is that references to the symbol with and without the |
| 5577 | version will be matched by the default symbol in the archive. */ |
| 5578 | |
| 5579 | p = strchr (name, ELF_VER_CHR); |
| 5580 | if (p == NULL || p[1] != ELF_VER_CHR) |
| 5581 | return h; |
| 5582 | |
| 5583 | /* First check with only one `@'. */ |
| 5584 | len = strlen (name); |
| 5585 | copy = (char *) bfd_alloc (abfd, len); |
| 5586 | if (copy == NULL) |
| 5587 | return (struct elf_link_hash_entry *) -1; |
| 5588 | |
| 5589 | first = p - name + 1; |
| 5590 | memcpy (copy, name, first); |
| 5591 | memcpy (copy + first, name + first + 1, len - first); |
| 5592 | |
| 5593 | h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE); |
| 5594 | if (h == NULL) |
| 5595 | { |
| 5596 | /* We also need to check references to the symbol without the |
| 5597 | version. */ |
| 5598 | copy[first - 1] = '\0'; |
| 5599 | h = elf_link_hash_lookup (elf_hash_table (info), copy, |
| 5600 | FALSE, FALSE, TRUE); |
| 5601 | } |
| 5602 | |
| 5603 | bfd_release (abfd, copy); |
| 5604 | return h; |
| 5605 | } |
| 5606 | |
| 5607 | /* Add symbols from an ELF archive file to the linker hash table. We |
| 5608 | don't use _bfd_generic_link_add_archive_symbols because we need to |
| 5609 | handle versioned symbols. |
| 5610 | |
| 5611 | Fortunately, ELF archive handling is simpler than that done by |
| 5612 | _bfd_generic_link_add_archive_symbols, which has to allow for a.out |
| 5613 | oddities. In ELF, if we find a symbol in the archive map, and the |
| 5614 | symbol is currently undefined, we know that we must pull in that |
| 5615 | object file. |
| 5616 | |
| 5617 | Unfortunately, we do have to make multiple passes over the symbol |
| 5618 | table until nothing further is resolved. */ |
| 5619 | |
| 5620 | static bfd_boolean |
| 5621 | elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info) |
| 5622 | { |
| 5623 | symindex c; |
| 5624 | unsigned char *included = NULL; |
| 5625 | carsym *symdefs; |
| 5626 | bfd_boolean loop; |
| 5627 | bfd_size_type amt; |
| 5628 | const struct elf_backend_data *bed; |
| 5629 | struct elf_link_hash_entry * (*archive_symbol_lookup) |
| 5630 | (bfd *, struct bfd_link_info *, const char *); |
| 5631 | |
| 5632 | if (! bfd_has_map (abfd)) |
| 5633 | { |
| 5634 | /* An empty archive is a special case. */ |
| 5635 | if (bfd_openr_next_archived_file (abfd, NULL) == NULL) |
| 5636 | return TRUE; |
| 5637 | bfd_set_error (bfd_error_no_armap); |
| 5638 | return FALSE; |
| 5639 | } |
| 5640 | |
| 5641 | /* Keep track of all symbols we know to be already defined, and all |
| 5642 | files we know to be already included. This is to speed up the |
| 5643 | second and subsequent passes. */ |
| 5644 | c = bfd_ardata (abfd)->symdef_count; |
| 5645 | if (c == 0) |
| 5646 | return TRUE; |
| 5647 | amt = c; |
| 5648 | amt *= sizeof (*included); |
| 5649 | included = (unsigned char *) bfd_zmalloc (amt); |
| 5650 | if (included == NULL) |
| 5651 | return FALSE; |
| 5652 | |
| 5653 | symdefs = bfd_ardata (abfd)->symdefs; |
| 5654 | bed = get_elf_backend_data (abfd); |
| 5655 | archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup; |
| 5656 | |
| 5657 | do |
| 5658 | { |
| 5659 | file_ptr last; |
| 5660 | symindex i; |
| 5661 | carsym *symdef; |
| 5662 | carsym *symdefend; |
| 5663 | |
| 5664 | loop = FALSE; |
| 5665 | last = -1; |
| 5666 | |
| 5667 | symdef = symdefs; |
| 5668 | symdefend = symdef + c; |
| 5669 | for (i = 0; symdef < symdefend; symdef++, i++) |
| 5670 | { |
| 5671 | struct elf_link_hash_entry *h; |
| 5672 | bfd *element; |
| 5673 | struct bfd_link_hash_entry *undefs_tail; |
| 5674 | symindex mark; |
| 5675 | |
| 5676 | if (included[i]) |
| 5677 | continue; |
| 5678 | if (symdef->file_offset == last) |
| 5679 | { |
| 5680 | included[i] = TRUE; |
| 5681 | continue; |
| 5682 | } |
| 5683 | |
| 5684 | h = archive_symbol_lookup (abfd, info, symdef->name); |
| 5685 | if (h == (struct elf_link_hash_entry *) -1) |
| 5686 | goto error_return; |
| 5687 | |
| 5688 | if (h == NULL) |
| 5689 | continue; |
| 5690 | |
| 5691 | if (h->root.type == bfd_link_hash_common) |
| 5692 | { |
| 5693 | /* We currently have a common symbol. The archive map contains |
| 5694 | a reference to this symbol, so we may want to include it. We |
| 5695 | only want to include it however, if this archive element |
| 5696 | contains a definition of the symbol, not just another common |
| 5697 | declaration of it. |
| 5698 | |
| 5699 | Unfortunately some archivers (including GNU ar) will put |
| 5700 | declarations of common symbols into their archive maps, as |
| 5701 | well as real definitions, so we cannot just go by the archive |
| 5702 | map alone. Instead we must read in the element's symbol |
| 5703 | table and check that to see what kind of symbol definition |
| 5704 | this is. */ |
| 5705 | if (! elf_link_is_defined_archive_symbol (abfd, symdef)) |
| 5706 | continue; |
| 5707 | } |
| 5708 | else if (h->root.type != bfd_link_hash_undefined) |
| 5709 | { |
| 5710 | if (h->root.type != bfd_link_hash_undefweak) |
| 5711 | /* Symbol must be defined. Don't check it again. */ |
| 5712 | included[i] = TRUE; |
| 5713 | continue; |
| 5714 | } |
| 5715 | |
| 5716 | /* We need to include this archive member. */ |
| 5717 | element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset); |
| 5718 | if (element == NULL) |
| 5719 | goto error_return; |
| 5720 | |
| 5721 | if (! bfd_check_format (element, bfd_object)) |
| 5722 | goto error_return; |
| 5723 | |
| 5724 | undefs_tail = info->hash->undefs_tail; |
| 5725 | |
| 5726 | if (!(*info->callbacks |
| 5727 | ->add_archive_element) (info, element, symdef->name, &element)) |
| 5728 | continue; |
| 5729 | if (!bfd_link_add_symbols (element, info)) |
| 5730 | goto error_return; |
| 5731 | |
| 5732 | /* If there are any new undefined symbols, we need to make |
| 5733 | another pass through the archive in order to see whether |
| 5734 | they can be defined. FIXME: This isn't perfect, because |
| 5735 | common symbols wind up on undefs_tail and because an |
| 5736 | undefined symbol which is defined later on in this pass |
| 5737 | does not require another pass. This isn't a bug, but it |
| 5738 | does make the code less efficient than it could be. */ |
| 5739 | if (undefs_tail != info->hash->undefs_tail) |
| 5740 | loop = TRUE; |
| 5741 | |
| 5742 | /* Look backward to mark all symbols from this object file |
| 5743 | which we have already seen in this pass. */ |
| 5744 | mark = i; |
| 5745 | do |
| 5746 | { |
| 5747 | included[mark] = TRUE; |
| 5748 | if (mark == 0) |
| 5749 | break; |
| 5750 | --mark; |
| 5751 | } |
| 5752 | while (symdefs[mark].file_offset == symdef->file_offset); |
| 5753 | |
| 5754 | /* We mark subsequent symbols from this object file as we go |
| 5755 | on through the loop. */ |
| 5756 | last = symdef->file_offset; |
| 5757 | } |
| 5758 | } |
| 5759 | while (loop); |
| 5760 | |
| 5761 | free (included); |
| 5762 | |
| 5763 | return TRUE; |
| 5764 | |
| 5765 | error_return: |
| 5766 | if (included != NULL) |
| 5767 | free (included); |
| 5768 | return FALSE; |
| 5769 | } |
| 5770 | |
| 5771 | /* Given an ELF BFD, add symbols to the global hash table as |
| 5772 | appropriate. */ |
| 5773 | |
| 5774 | bfd_boolean |
| 5775 | bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info) |
| 5776 | { |
| 5777 | switch (bfd_get_format (abfd)) |
| 5778 | { |
| 5779 | case bfd_object: |
| 5780 | return elf_link_add_object_symbols (abfd, info); |
| 5781 | case bfd_archive: |
| 5782 | return elf_link_add_archive_symbols (abfd, info); |
| 5783 | default: |
| 5784 | bfd_set_error (bfd_error_wrong_format); |
| 5785 | return FALSE; |
| 5786 | } |
| 5787 | } |
| 5788 | \f |
| 5789 | struct hash_codes_info |
| 5790 | { |
| 5791 | unsigned long *hashcodes; |
| 5792 | bfd_boolean error; |
| 5793 | }; |
| 5794 | |
| 5795 | /* This function will be called though elf_link_hash_traverse to store |
| 5796 | all hash value of the exported symbols in an array. */ |
| 5797 | |
| 5798 | static bfd_boolean |
| 5799 | elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data) |
| 5800 | { |
| 5801 | struct hash_codes_info *inf = (struct hash_codes_info *) data; |
| 5802 | const char *name; |
| 5803 | unsigned long ha; |
| 5804 | char *alc = NULL; |
| 5805 | |
| 5806 | /* Ignore indirect symbols. These are added by the versioning code. */ |
| 5807 | if (h->dynindx == -1) |
| 5808 | return TRUE; |
| 5809 | |
| 5810 | name = h->root.root.string; |
| 5811 | if (h->versioned >= versioned) |
| 5812 | { |
| 5813 | char *p = strchr (name, ELF_VER_CHR); |
| 5814 | if (p != NULL) |
| 5815 | { |
| 5816 | alc = (char *) bfd_malloc (p - name + 1); |
| 5817 | if (alc == NULL) |
| 5818 | { |
| 5819 | inf->error = TRUE; |
| 5820 | return FALSE; |
| 5821 | } |
| 5822 | memcpy (alc, name, p - name); |
| 5823 | alc[p - name] = '\0'; |
| 5824 | name = alc; |
| 5825 | } |
| 5826 | } |
| 5827 | |
| 5828 | /* Compute the hash value. */ |
| 5829 | ha = bfd_elf_hash (name); |
| 5830 | |
| 5831 | /* Store the found hash value in the array given as the argument. */ |
| 5832 | *(inf->hashcodes)++ = ha; |
| 5833 | |
| 5834 | /* And store it in the struct so that we can put it in the hash table |
| 5835 | later. */ |
| 5836 | h->u.elf_hash_value = ha; |
| 5837 | |
| 5838 | if (alc != NULL) |
| 5839 | free (alc); |
| 5840 | |
| 5841 | return TRUE; |
| 5842 | } |
| 5843 | |
| 5844 | struct collect_gnu_hash_codes |
| 5845 | { |
| 5846 | bfd *output_bfd; |
| 5847 | const struct elf_backend_data *bed; |
| 5848 | unsigned long int nsyms; |
| 5849 | unsigned long int maskbits; |
| 5850 | unsigned long int *hashcodes; |
| 5851 | unsigned long int *hashval; |
| 5852 | unsigned long int *indx; |
| 5853 | unsigned long int *counts; |
| 5854 | bfd_vma *bitmask; |
| 5855 | bfd_byte *contents; |
| 5856 | bfd_size_type xlat; |
| 5857 | long int min_dynindx; |
| 5858 | unsigned long int bucketcount; |
| 5859 | unsigned long int symindx; |
| 5860 | long int local_indx; |
| 5861 | long int shift1, shift2; |
| 5862 | unsigned long int mask; |
| 5863 | bfd_boolean error; |
| 5864 | }; |
| 5865 | |
| 5866 | /* This function will be called though elf_link_hash_traverse to store |
| 5867 | all hash value of the exported symbols in an array. */ |
| 5868 | |
| 5869 | static bfd_boolean |
| 5870 | elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data) |
| 5871 | { |
| 5872 | struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data; |
| 5873 | const char *name; |
| 5874 | unsigned long ha; |
| 5875 | char *alc = NULL; |
| 5876 | |
| 5877 | /* Ignore indirect symbols. These are added by the versioning code. */ |
| 5878 | if (h->dynindx == -1) |
| 5879 | return TRUE; |
| 5880 | |
| 5881 | /* Ignore also local symbols and undefined symbols. */ |
| 5882 | if (! (*s->bed->elf_hash_symbol) (h)) |
| 5883 | return TRUE; |
| 5884 | |
| 5885 | name = h->root.root.string; |
| 5886 | if (h->versioned >= versioned) |
| 5887 | { |
| 5888 | char *p = strchr (name, ELF_VER_CHR); |
| 5889 | if (p != NULL) |
| 5890 | { |
| 5891 | alc = (char *) bfd_malloc (p - name + 1); |
| 5892 | if (alc == NULL) |
| 5893 | { |
| 5894 | s->error = TRUE; |
| 5895 | return FALSE; |
| 5896 | } |
| 5897 | memcpy (alc, name, p - name); |
| 5898 | alc[p - name] = '\0'; |
| 5899 | name = alc; |
| 5900 | } |
| 5901 | } |
| 5902 | |
| 5903 | /* Compute the hash value. */ |
| 5904 | ha = bfd_elf_gnu_hash (name); |
| 5905 | |
| 5906 | /* Store the found hash value in the array for compute_bucket_count, |
| 5907 | and also for .dynsym reordering purposes. */ |
| 5908 | s->hashcodes[s->nsyms] = ha; |
| 5909 | s->hashval[h->dynindx] = ha; |
| 5910 | ++s->nsyms; |
| 5911 | if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx) |
| 5912 | s->min_dynindx = h->dynindx; |
| 5913 | |
| 5914 | if (alc != NULL) |
| 5915 | free (alc); |
| 5916 | |
| 5917 | return TRUE; |
| 5918 | } |
| 5919 | |
| 5920 | /* This function will be called though elf_link_hash_traverse to do |
| 5921 | final dynamic symbol renumbering in case of .gnu.hash. |
| 5922 | If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index |
| 5923 | to the translation table. */ |
| 5924 | |
| 5925 | static bfd_boolean |
| 5926 | elf_gnu_hash_process_symidx (struct elf_link_hash_entry *h, void *data) |
| 5927 | { |
| 5928 | struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data; |
| 5929 | unsigned long int bucket; |
| 5930 | unsigned long int val; |
| 5931 | |
| 5932 | /* Ignore indirect symbols. */ |
| 5933 | if (h->dynindx == -1) |
| 5934 | return TRUE; |
| 5935 | |
| 5936 | /* Ignore also local symbols and undefined symbols. */ |
| 5937 | if (! (*s->bed->elf_hash_symbol) (h)) |
| 5938 | { |
| 5939 | if (h->dynindx >= s->min_dynindx) |
| 5940 | { |
| 5941 | if (s->bed->record_xhash_symbol != NULL) |
| 5942 | { |
| 5943 | (*s->bed->record_xhash_symbol) (h, 0); |
| 5944 | s->local_indx++; |
| 5945 | } |
| 5946 | else |
| 5947 | h->dynindx = s->local_indx++; |
| 5948 | } |
| 5949 | return TRUE; |
| 5950 | } |
| 5951 | |
| 5952 | bucket = s->hashval[h->dynindx] % s->bucketcount; |
| 5953 | val = (s->hashval[h->dynindx] >> s->shift1) |
| 5954 | & ((s->maskbits >> s->shift1) - 1); |
| 5955 | s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask); |
| 5956 | s->bitmask[val] |
| 5957 | |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask); |
| 5958 | val = s->hashval[h->dynindx] & ~(unsigned long int) 1; |
| 5959 | if (s->counts[bucket] == 1) |
| 5960 | /* Last element terminates the chain. */ |
| 5961 | val |= 1; |
| 5962 | bfd_put_32 (s->output_bfd, val, |
| 5963 | s->contents + (s->indx[bucket] - s->symindx) * 4); |
| 5964 | --s->counts[bucket]; |
| 5965 | if (s->bed->record_xhash_symbol != NULL) |
| 5966 | { |
| 5967 | bfd_vma xlat_loc = s->xlat + (s->indx[bucket]++ - s->symindx) * 4; |
| 5968 | |
| 5969 | (*s->bed->record_xhash_symbol) (h, xlat_loc); |
| 5970 | } |
| 5971 | else |
| 5972 | h->dynindx = s->indx[bucket]++; |
| 5973 | return TRUE; |
| 5974 | } |
| 5975 | |
| 5976 | /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ |
| 5977 | |
| 5978 | bfd_boolean |
| 5979 | _bfd_elf_hash_symbol (struct elf_link_hash_entry *h) |
| 5980 | { |
| 5981 | return !(h->forced_local |
| 5982 | || h->root.type == bfd_link_hash_undefined |
| 5983 | || h->root.type == bfd_link_hash_undefweak |
| 5984 | || ((h->root.type == bfd_link_hash_defined |
| 5985 | || h->root.type == bfd_link_hash_defweak) |
| 5986 | && h->root.u.def.section->output_section == NULL)); |
| 5987 | } |
| 5988 | |
| 5989 | /* Array used to determine the number of hash table buckets to use |
| 5990 | based on the number of symbols there are. If there are fewer than |
| 5991 | 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets, |
| 5992 | fewer than 37 we use 17 buckets, and so forth. We never use more |
| 5993 | than 32771 buckets. */ |
| 5994 | |
| 5995 | static const size_t elf_buckets[] = |
| 5996 | { |
| 5997 | 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209, |
| 5998 | 16411, 32771, 0 |
| 5999 | }; |
| 6000 | |
| 6001 | /* Compute bucket count for hashing table. We do not use a static set |
| 6002 | of possible tables sizes anymore. Instead we determine for all |
| 6003 | possible reasonable sizes of the table the outcome (i.e., the |
| 6004 | number of collisions etc) and choose the best solution. The |
| 6005 | weighting functions are not too simple to allow the table to grow |
| 6006 | without bounds. Instead one of the weighting factors is the size. |
| 6007 | Therefore the result is always a good payoff between few collisions |
| 6008 | (= short chain lengths) and table size. */ |
| 6009 | static size_t |
| 6010 | compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 6011 | unsigned long int *hashcodes ATTRIBUTE_UNUSED, |
| 6012 | unsigned long int nsyms, |
| 6013 | int gnu_hash) |
| 6014 | { |
| 6015 | size_t best_size = 0; |
| 6016 | unsigned long int i; |
| 6017 | |
| 6018 | /* We have a problem here. The following code to optimize the table |
| 6019 | size requires an integer type with more the 32 bits. If |
| 6020 | BFD_HOST_U_64_BIT is set we know about such a type. */ |
| 6021 | #ifdef BFD_HOST_U_64_BIT |
| 6022 | if (info->optimize) |
| 6023 | { |
| 6024 | size_t minsize; |
| 6025 | size_t maxsize; |
| 6026 | BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0); |
| 6027 | bfd *dynobj = elf_hash_table (info)->dynobj; |
| 6028 | size_t dynsymcount = elf_hash_table (info)->dynsymcount; |
| 6029 | const struct elf_backend_data *bed = get_elf_backend_data (dynobj); |
| 6030 | unsigned long int *counts; |
| 6031 | bfd_size_type amt; |
| 6032 | unsigned int no_improvement_count = 0; |
| 6033 | |
| 6034 | /* Possible optimization parameters: if we have NSYMS symbols we say |
| 6035 | that the hashing table must at least have NSYMS/4 and at most |
| 6036 | 2*NSYMS buckets. */ |
| 6037 | minsize = nsyms / 4; |
| 6038 | if (minsize == 0) |
| 6039 | minsize = 1; |
| 6040 | best_size = maxsize = nsyms * 2; |
| 6041 | if (gnu_hash) |
| 6042 | { |
| 6043 | if (minsize < 2) |
| 6044 | minsize = 2; |
| 6045 | if ((best_size & 31) == 0) |
| 6046 | ++best_size; |
| 6047 | } |
| 6048 | |
| 6049 | /* Create array where we count the collisions in. We must use bfd_malloc |
| 6050 | since the size could be large. */ |
| 6051 | amt = maxsize; |
| 6052 | amt *= sizeof (unsigned long int); |
| 6053 | counts = (unsigned long int *) bfd_malloc (amt); |
| 6054 | if (counts == NULL) |
| 6055 | return 0; |
| 6056 | |
| 6057 | /* Compute the "optimal" size for the hash table. The criteria is a |
| 6058 | minimal chain length. The minor criteria is (of course) the size |
| 6059 | of the table. */ |
| 6060 | for (i = minsize; i < maxsize; ++i) |
| 6061 | { |
| 6062 | /* Walk through the array of hashcodes and count the collisions. */ |
| 6063 | BFD_HOST_U_64_BIT max; |
| 6064 | unsigned long int j; |
| 6065 | unsigned long int fact; |
| 6066 | |
| 6067 | if (gnu_hash && (i & 31) == 0) |
| 6068 | continue; |
| 6069 | |
| 6070 | memset (counts, '\0', i * sizeof (unsigned long int)); |
| 6071 | |
| 6072 | /* Determine how often each hash bucket is used. */ |
| 6073 | for (j = 0; j < nsyms; ++j) |
| 6074 | ++counts[hashcodes[j] % i]; |
| 6075 | |
| 6076 | /* For the weight function we need some information about the |
| 6077 | pagesize on the target. This is information need not be 100% |
| 6078 | accurate. Since this information is not available (so far) we |
| 6079 | define it here to a reasonable default value. If it is crucial |
| 6080 | to have a better value some day simply define this value. */ |
| 6081 | # ifndef BFD_TARGET_PAGESIZE |
| 6082 | # define BFD_TARGET_PAGESIZE (4096) |
| 6083 | # endif |
| 6084 | |
| 6085 | /* We in any case need 2 + DYNSYMCOUNT entries for the size values |
| 6086 | and the chains. */ |
| 6087 | max = (2 + dynsymcount) * bed->s->sizeof_hash_entry; |
| 6088 | |
| 6089 | # if 1 |
| 6090 | /* Variant 1: optimize for short chains. We add the squares |
| 6091 | of all the chain lengths (which favors many small chain |
| 6092 | over a few long chains). */ |
| 6093 | for (j = 0; j < i; ++j) |
| 6094 | max += counts[j] * counts[j]; |
| 6095 | |
| 6096 | /* This adds penalties for the overall size of the table. */ |
| 6097 | fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1; |
| 6098 | max *= fact * fact; |
| 6099 | # else |
| 6100 | /* Variant 2: Optimize a lot more for small table. Here we |
| 6101 | also add squares of the size but we also add penalties for |
| 6102 | empty slots (the +1 term). */ |
| 6103 | for (j = 0; j < i; ++j) |
| 6104 | max += (1 + counts[j]) * (1 + counts[j]); |
| 6105 | |
| 6106 | /* The overall size of the table is considered, but not as |
| 6107 | strong as in variant 1, where it is squared. */ |
| 6108 | fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1; |
| 6109 | max *= fact; |
| 6110 | # endif |
| 6111 | |
| 6112 | /* Compare with current best results. */ |
| 6113 | if (max < best_chlen) |
| 6114 | { |
| 6115 | best_chlen = max; |
| 6116 | best_size = i; |
| 6117 | no_improvement_count = 0; |
| 6118 | } |
| 6119 | /* PR 11843: Avoid futile long searches for the best bucket size |
| 6120 | when there are a large number of symbols. */ |
| 6121 | else if (++no_improvement_count == 100) |
| 6122 | break; |
| 6123 | } |
| 6124 | |
| 6125 | free (counts); |
| 6126 | } |
| 6127 | else |
| 6128 | #endif /* defined (BFD_HOST_U_64_BIT) */ |
| 6129 | { |
| 6130 | /* This is the fallback solution if no 64bit type is available or if we |
| 6131 | are not supposed to spend much time on optimizations. We select the |
| 6132 | bucket count using a fixed set of numbers. */ |
| 6133 | for (i = 0; elf_buckets[i] != 0; i++) |
| 6134 | { |
| 6135 | best_size = elf_buckets[i]; |
| 6136 | if (nsyms < elf_buckets[i + 1]) |
| 6137 | break; |
| 6138 | } |
| 6139 | if (gnu_hash && best_size < 2) |
| 6140 | best_size = 2; |
| 6141 | } |
| 6142 | |
| 6143 | return best_size; |
| 6144 | } |
| 6145 | |
| 6146 | /* Size any SHT_GROUP section for ld -r. */ |
| 6147 | |
| 6148 | bfd_boolean |
| 6149 | _bfd_elf_size_group_sections (struct bfd_link_info *info) |
| 6150 | { |
| 6151 | bfd *ibfd; |
| 6152 | asection *s; |
| 6153 | |
| 6154 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) |
| 6155 | if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour |
| 6156 | && (s = ibfd->sections) != NULL |
| 6157 | && s->sec_info_type != SEC_INFO_TYPE_JUST_SYMS |
| 6158 | && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr)) |
| 6159 | return FALSE; |
| 6160 | return TRUE; |
| 6161 | } |
| 6162 | |
| 6163 | /* Set a default stack segment size. The value in INFO wins. If it |
| 6164 | is unset, LEGACY_SYMBOL's value is used, and if that symbol is |
| 6165 | undefined it is initialized. */ |
| 6166 | |
| 6167 | bfd_boolean |
| 6168 | bfd_elf_stack_segment_size (bfd *output_bfd, |
| 6169 | struct bfd_link_info *info, |
| 6170 | const char *legacy_symbol, |
| 6171 | bfd_vma default_size) |
| 6172 | { |
| 6173 | struct elf_link_hash_entry *h = NULL; |
| 6174 | |
| 6175 | /* Look for legacy symbol. */ |
| 6176 | if (legacy_symbol) |
| 6177 | h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol, |
| 6178 | FALSE, FALSE, FALSE); |
| 6179 | if (h && (h->root.type == bfd_link_hash_defined |
| 6180 | || h->root.type == bfd_link_hash_defweak) |
| 6181 | && h->def_regular |
| 6182 | && (h->type == STT_NOTYPE || h->type == STT_OBJECT)) |
| 6183 | { |
| 6184 | /* The symbol has no type if specified on the command line. */ |
| 6185 | h->type = STT_OBJECT; |
| 6186 | if (info->stacksize) |
| 6187 | /* xgettext:c-format */ |
| 6188 | _bfd_error_handler (_("%pB: stack size specified and %s set"), |
| 6189 | output_bfd, legacy_symbol); |
| 6190 | else if (h->root.u.def.section != bfd_abs_section_ptr) |
| 6191 | /* xgettext:c-format */ |
| 6192 | _bfd_error_handler (_("%pB: %s not absolute"), |
| 6193 | output_bfd, legacy_symbol); |
| 6194 | else |
| 6195 | info->stacksize = h->root.u.def.value; |
| 6196 | } |
| 6197 | |
| 6198 | if (!info->stacksize) |
| 6199 | /* If the user didn't set a size, or explicitly inhibit the |
| 6200 | size, set it now. */ |
| 6201 | info->stacksize = default_size; |
| 6202 | |
| 6203 | /* Provide the legacy symbol, if it is referenced. */ |
| 6204 | if (h && (h->root.type == bfd_link_hash_undefined |
| 6205 | || h->root.type == bfd_link_hash_undefweak)) |
| 6206 | { |
| 6207 | struct bfd_link_hash_entry *bh = NULL; |
| 6208 | |
| 6209 | if (!(_bfd_generic_link_add_one_symbol |
| 6210 | (info, output_bfd, legacy_symbol, |
| 6211 | BSF_GLOBAL, bfd_abs_section_ptr, |
| 6212 | info->stacksize >= 0 ? info->stacksize : 0, |
| 6213 | NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh))) |
| 6214 | return FALSE; |
| 6215 | |
| 6216 | h = (struct elf_link_hash_entry *) bh; |
| 6217 | h->def_regular = 1; |
| 6218 | h->type = STT_OBJECT; |
| 6219 | } |
| 6220 | |
| 6221 | return TRUE; |
| 6222 | } |
| 6223 | |
| 6224 | /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */ |
| 6225 | |
| 6226 | struct elf_gc_sweep_symbol_info |
| 6227 | { |
| 6228 | struct bfd_link_info *info; |
| 6229 | void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *, |
| 6230 | bfd_boolean); |
| 6231 | }; |
| 6232 | |
| 6233 | static bfd_boolean |
| 6234 | elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data) |
| 6235 | { |
| 6236 | if (!h->mark |
| 6237 | && (((h->root.type == bfd_link_hash_defined |
| 6238 | || h->root.type == bfd_link_hash_defweak) |
| 6239 | && !((h->def_regular || ELF_COMMON_DEF_P (h)) |
| 6240 | && h->root.u.def.section->gc_mark)) |
| 6241 | || h->root.type == bfd_link_hash_undefined |
| 6242 | || h->root.type == bfd_link_hash_undefweak)) |
| 6243 | { |
| 6244 | struct elf_gc_sweep_symbol_info *inf; |
| 6245 | |
| 6246 | inf = (struct elf_gc_sweep_symbol_info *) data; |
| 6247 | (*inf->hide_symbol) (inf->info, h, TRUE); |
| 6248 | h->def_regular = 0; |
| 6249 | h->ref_regular = 0; |
| 6250 | h->ref_regular_nonweak = 0; |
| 6251 | } |
| 6252 | |
| 6253 | return TRUE; |
| 6254 | } |
| 6255 | |
| 6256 | /* Set up the sizes and contents of the ELF dynamic sections. This is |
| 6257 | called by the ELF linker emulation before_allocation routine. We |
| 6258 | must set the sizes of the sections before the linker sets the |
| 6259 | addresses of the various sections. */ |
| 6260 | |
| 6261 | bfd_boolean |
| 6262 | bfd_elf_size_dynamic_sections (bfd *output_bfd, |
| 6263 | const char *soname, |
| 6264 | const char *rpath, |
| 6265 | const char *filter_shlib, |
| 6266 | const char *audit, |
| 6267 | const char *depaudit, |
| 6268 | const char * const *auxiliary_filters, |
| 6269 | struct bfd_link_info *info, |
| 6270 | asection **sinterpptr) |
| 6271 | { |
| 6272 | bfd *dynobj; |
| 6273 | const struct elf_backend_data *bed; |
| 6274 | |
| 6275 | *sinterpptr = NULL; |
| 6276 | |
| 6277 | if (!is_elf_hash_table (info->hash)) |
| 6278 | return TRUE; |
| 6279 | |
| 6280 | dynobj = elf_hash_table (info)->dynobj; |
| 6281 | |
| 6282 | if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created) |
| 6283 | { |
| 6284 | struct bfd_elf_version_tree *verdefs; |
| 6285 | struct elf_info_failed asvinfo; |
| 6286 | struct bfd_elf_version_tree *t; |
| 6287 | struct bfd_elf_version_expr *d; |
| 6288 | asection *s; |
| 6289 | size_t soname_indx; |
| 6290 | |
| 6291 | /* If we are supposed to export all symbols into the dynamic symbol |
| 6292 | table (this is not the normal case), then do so. */ |
| 6293 | if (info->export_dynamic |
| 6294 | || (bfd_link_executable (info) && info->dynamic)) |
| 6295 | { |
| 6296 | struct elf_info_failed eif; |
| 6297 | |
| 6298 | eif.info = info; |
| 6299 | eif.failed = FALSE; |
| 6300 | elf_link_hash_traverse (elf_hash_table (info), |
| 6301 | _bfd_elf_export_symbol, |
| 6302 | &eif); |
| 6303 | if (eif.failed) |
| 6304 | return FALSE; |
| 6305 | } |
| 6306 | |
| 6307 | if (soname != NULL) |
| 6308 | { |
| 6309 | soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 6310 | soname, TRUE); |
| 6311 | if (soname_indx == (size_t) -1 |
| 6312 | || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx)) |
| 6313 | return FALSE; |
| 6314 | } |
| 6315 | else |
| 6316 | soname_indx = (size_t) -1; |
| 6317 | |
| 6318 | /* Make all global versions with definition. */ |
| 6319 | for (t = info->version_info; t != NULL; t = t->next) |
| 6320 | for (d = t->globals.list; d != NULL; d = d->next) |
| 6321 | if (!d->symver && d->literal) |
| 6322 | { |
| 6323 | const char *verstr, *name; |
| 6324 | size_t namelen, verlen, newlen; |
| 6325 | char *newname, *p, leading_char; |
| 6326 | struct elf_link_hash_entry *newh; |
| 6327 | |
| 6328 | leading_char = bfd_get_symbol_leading_char (output_bfd); |
| 6329 | name = d->pattern; |
| 6330 | namelen = strlen (name) + (leading_char != '\0'); |
| 6331 | verstr = t->name; |
| 6332 | verlen = strlen (verstr); |
| 6333 | newlen = namelen + verlen + 3; |
| 6334 | |
| 6335 | newname = (char *) bfd_malloc (newlen); |
| 6336 | if (newname == NULL) |
| 6337 | return FALSE; |
| 6338 | newname[0] = leading_char; |
| 6339 | memcpy (newname + (leading_char != '\0'), name, namelen); |
| 6340 | |
| 6341 | /* Check the hidden versioned definition. */ |
| 6342 | p = newname + namelen; |
| 6343 | *p++ = ELF_VER_CHR; |
| 6344 | memcpy (p, verstr, verlen + 1); |
| 6345 | newh = elf_link_hash_lookup (elf_hash_table (info), |
| 6346 | newname, FALSE, FALSE, |
| 6347 | FALSE); |
| 6348 | if (newh == NULL |
| 6349 | || (newh->root.type != bfd_link_hash_defined |
| 6350 | && newh->root.type != bfd_link_hash_defweak)) |
| 6351 | { |
| 6352 | /* Check the default versioned definition. */ |
| 6353 | *p++ = ELF_VER_CHR; |
| 6354 | memcpy (p, verstr, verlen + 1); |
| 6355 | newh = elf_link_hash_lookup (elf_hash_table (info), |
| 6356 | newname, FALSE, FALSE, |
| 6357 | FALSE); |
| 6358 | } |
| 6359 | free (newname); |
| 6360 | |
| 6361 | /* Mark this version if there is a definition and it is |
| 6362 | not defined in a shared object. */ |
| 6363 | if (newh != NULL |
| 6364 | && !newh->def_dynamic |
| 6365 | && (newh->root.type == bfd_link_hash_defined |
| 6366 | || newh->root.type == bfd_link_hash_defweak)) |
| 6367 | d->symver = 1; |
| 6368 | } |
| 6369 | |
| 6370 | /* Attach all the symbols to their version information. */ |
| 6371 | asvinfo.info = info; |
| 6372 | asvinfo.failed = FALSE; |
| 6373 | |
| 6374 | elf_link_hash_traverse (elf_hash_table (info), |
| 6375 | _bfd_elf_link_assign_sym_version, |
| 6376 | &asvinfo); |
| 6377 | if (asvinfo.failed) |
| 6378 | return FALSE; |
| 6379 | |
| 6380 | if (!info->allow_undefined_version) |
| 6381 | { |
| 6382 | /* Check if all global versions have a definition. */ |
| 6383 | bfd_boolean all_defined = TRUE; |
| 6384 | for (t = info->version_info; t != NULL; t = t->next) |
| 6385 | for (d = t->globals.list; d != NULL; d = d->next) |
| 6386 | if (d->literal && !d->symver && !d->script) |
| 6387 | { |
| 6388 | _bfd_error_handler |
| 6389 | (_("%s: undefined version: %s"), |
| 6390 | d->pattern, t->name); |
| 6391 | all_defined = FALSE; |
| 6392 | } |
| 6393 | |
| 6394 | if (!all_defined) |
| 6395 | { |
| 6396 | bfd_set_error (bfd_error_bad_value); |
| 6397 | return FALSE; |
| 6398 | } |
| 6399 | } |
| 6400 | |
| 6401 | /* Set up the version definition section. */ |
| 6402 | s = bfd_get_linker_section (dynobj, ".gnu.version_d"); |
| 6403 | BFD_ASSERT (s != NULL); |
| 6404 | |
| 6405 | /* We may have created additional version definitions if we are |
| 6406 | just linking a regular application. */ |
| 6407 | verdefs = info->version_info; |
| 6408 | |
| 6409 | /* Skip anonymous version tag. */ |
| 6410 | if (verdefs != NULL && verdefs->vernum == 0) |
| 6411 | verdefs = verdefs->next; |
| 6412 | |
| 6413 | if (verdefs == NULL && !info->create_default_symver) |
| 6414 | s->flags |= SEC_EXCLUDE; |
| 6415 | else |
| 6416 | { |
| 6417 | unsigned int cdefs; |
| 6418 | bfd_size_type size; |
| 6419 | bfd_byte *p; |
| 6420 | Elf_Internal_Verdef def; |
| 6421 | Elf_Internal_Verdaux defaux; |
| 6422 | struct bfd_link_hash_entry *bh; |
| 6423 | struct elf_link_hash_entry *h; |
| 6424 | const char *name; |
| 6425 | |
| 6426 | cdefs = 0; |
| 6427 | size = 0; |
| 6428 | |
| 6429 | /* Make space for the base version. */ |
| 6430 | size += sizeof (Elf_External_Verdef); |
| 6431 | size += sizeof (Elf_External_Verdaux); |
| 6432 | ++cdefs; |
| 6433 | |
| 6434 | /* Make space for the default version. */ |
| 6435 | if (info->create_default_symver) |
| 6436 | { |
| 6437 | size += sizeof (Elf_External_Verdef); |
| 6438 | ++cdefs; |
| 6439 | } |
| 6440 | |
| 6441 | for (t = verdefs; t != NULL; t = t->next) |
| 6442 | { |
| 6443 | struct bfd_elf_version_deps *n; |
| 6444 | |
| 6445 | /* Don't emit base version twice. */ |
| 6446 | if (t->vernum == 0) |
| 6447 | continue; |
| 6448 | |
| 6449 | size += sizeof (Elf_External_Verdef); |
| 6450 | size += sizeof (Elf_External_Verdaux); |
| 6451 | ++cdefs; |
| 6452 | |
| 6453 | for (n = t->deps; n != NULL; n = n->next) |
| 6454 | size += sizeof (Elf_External_Verdaux); |
| 6455 | } |
| 6456 | |
| 6457 | s->size = size; |
| 6458 | s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size); |
| 6459 | if (s->contents == NULL && s->size != 0) |
| 6460 | return FALSE; |
| 6461 | |
| 6462 | /* Fill in the version definition section. */ |
| 6463 | |
| 6464 | p = s->contents; |
| 6465 | |
| 6466 | def.vd_version = VER_DEF_CURRENT; |
| 6467 | def.vd_flags = VER_FLG_BASE; |
| 6468 | def.vd_ndx = 1; |
| 6469 | def.vd_cnt = 1; |
| 6470 | if (info->create_default_symver) |
| 6471 | { |
| 6472 | def.vd_aux = 2 * sizeof (Elf_External_Verdef); |
| 6473 | def.vd_next = sizeof (Elf_External_Verdef); |
| 6474 | } |
| 6475 | else |
| 6476 | { |
| 6477 | def.vd_aux = sizeof (Elf_External_Verdef); |
| 6478 | def.vd_next = (sizeof (Elf_External_Verdef) |
| 6479 | + sizeof (Elf_External_Verdaux)); |
| 6480 | } |
| 6481 | |
| 6482 | if (soname_indx != (size_t) -1) |
| 6483 | { |
| 6484 | _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, |
| 6485 | soname_indx); |
| 6486 | def.vd_hash = bfd_elf_hash (soname); |
| 6487 | defaux.vda_name = soname_indx; |
| 6488 | name = soname; |
| 6489 | } |
| 6490 | else |
| 6491 | { |
| 6492 | size_t indx; |
| 6493 | |
| 6494 | name = lbasename (output_bfd->filename); |
| 6495 | def.vd_hash = bfd_elf_hash (name); |
| 6496 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 6497 | name, FALSE); |
| 6498 | if (indx == (size_t) -1) |
| 6499 | return FALSE; |
| 6500 | defaux.vda_name = indx; |
| 6501 | } |
| 6502 | defaux.vda_next = 0; |
| 6503 | |
| 6504 | _bfd_elf_swap_verdef_out (output_bfd, &def, |
| 6505 | (Elf_External_Verdef *) p); |
| 6506 | p += sizeof (Elf_External_Verdef); |
| 6507 | if (info->create_default_symver) |
| 6508 | { |
| 6509 | /* Add a symbol representing this version. */ |
| 6510 | bh = NULL; |
| 6511 | if (! (_bfd_generic_link_add_one_symbol |
| 6512 | (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr, |
| 6513 | 0, NULL, FALSE, |
| 6514 | get_elf_backend_data (dynobj)->collect, &bh))) |
| 6515 | return FALSE; |
| 6516 | h = (struct elf_link_hash_entry *) bh; |
| 6517 | h->non_elf = 0; |
| 6518 | h->def_regular = 1; |
| 6519 | h->type = STT_OBJECT; |
| 6520 | h->verinfo.vertree = NULL; |
| 6521 | |
| 6522 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 6523 | return FALSE; |
| 6524 | |
| 6525 | /* Create a duplicate of the base version with the same |
| 6526 | aux block, but different flags. */ |
| 6527 | def.vd_flags = 0; |
| 6528 | def.vd_ndx = 2; |
| 6529 | def.vd_aux = sizeof (Elf_External_Verdef); |
| 6530 | if (verdefs) |
| 6531 | def.vd_next = (sizeof (Elf_External_Verdef) |
| 6532 | + sizeof (Elf_External_Verdaux)); |
| 6533 | else |
| 6534 | def.vd_next = 0; |
| 6535 | _bfd_elf_swap_verdef_out (output_bfd, &def, |
| 6536 | (Elf_External_Verdef *) p); |
| 6537 | p += sizeof (Elf_External_Verdef); |
| 6538 | } |
| 6539 | _bfd_elf_swap_verdaux_out (output_bfd, &defaux, |
| 6540 | (Elf_External_Verdaux *) p); |
| 6541 | p += sizeof (Elf_External_Verdaux); |
| 6542 | |
| 6543 | for (t = verdefs; t != NULL; t = t->next) |
| 6544 | { |
| 6545 | unsigned int cdeps; |
| 6546 | struct bfd_elf_version_deps *n; |
| 6547 | |
| 6548 | /* Don't emit the base version twice. */ |
| 6549 | if (t->vernum == 0) |
| 6550 | continue; |
| 6551 | |
| 6552 | cdeps = 0; |
| 6553 | for (n = t->deps; n != NULL; n = n->next) |
| 6554 | ++cdeps; |
| 6555 | |
| 6556 | /* Add a symbol representing this version. */ |
| 6557 | bh = NULL; |
| 6558 | if (! (_bfd_generic_link_add_one_symbol |
| 6559 | (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr, |
| 6560 | 0, NULL, FALSE, |
| 6561 | get_elf_backend_data (dynobj)->collect, &bh))) |
| 6562 | return FALSE; |
| 6563 | h = (struct elf_link_hash_entry *) bh; |
| 6564 | h->non_elf = 0; |
| 6565 | h->def_regular = 1; |
| 6566 | h->type = STT_OBJECT; |
| 6567 | h->verinfo.vertree = t; |
| 6568 | |
| 6569 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 6570 | return FALSE; |
| 6571 | |
| 6572 | def.vd_version = VER_DEF_CURRENT; |
| 6573 | def.vd_flags = 0; |
| 6574 | if (t->globals.list == NULL |
| 6575 | && t->locals.list == NULL |
| 6576 | && ! t->used) |
| 6577 | def.vd_flags |= VER_FLG_WEAK; |
| 6578 | def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1); |
| 6579 | def.vd_cnt = cdeps + 1; |
| 6580 | def.vd_hash = bfd_elf_hash (t->name); |
| 6581 | def.vd_aux = sizeof (Elf_External_Verdef); |
| 6582 | def.vd_next = 0; |
| 6583 | |
| 6584 | /* If a basever node is next, it *must* be the last node in |
| 6585 | the chain, otherwise Verdef construction breaks. */ |
| 6586 | if (t->next != NULL && t->next->vernum == 0) |
| 6587 | BFD_ASSERT (t->next->next == NULL); |
| 6588 | |
| 6589 | if (t->next != NULL && t->next->vernum != 0) |
| 6590 | def.vd_next = (sizeof (Elf_External_Verdef) |
| 6591 | + (cdeps + 1) * sizeof (Elf_External_Verdaux)); |
| 6592 | |
| 6593 | _bfd_elf_swap_verdef_out (output_bfd, &def, |
| 6594 | (Elf_External_Verdef *) p); |
| 6595 | p += sizeof (Elf_External_Verdef); |
| 6596 | |
| 6597 | defaux.vda_name = h->dynstr_index; |
| 6598 | _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, |
| 6599 | h->dynstr_index); |
| 6600 | defaux.vda_next = 0; |
| 6601 | if (t->deps != NULL) |
| 6602 | defaux.vda_next = sizeof (Elf_External_Verdaux); |
| 6603 | t->name_indx = defaux.vda_name; |
| 6604 | |
| 6605 | _bfd_elf_swap_verdaux_out (output_bfd, &defaux, |
| 6606 | (Elf_External_Verdaux *) p); |
| 6607 | p += sizeof (Elf_External_Verdaux); |
| 6608 | |
| 6609 | for (n = t->deps; n != NULL; n = n->next) |
| 6610 | { |
| 6611 | if (n->version_needed == NULL) |
| 6612 | { |
| 6613 | /* This can happen if there was an error in the |
| 6614 | version script. */ |
| 6615 | defaux.vda_name = 0; |
| 6616 | } |
| 6617 | else |
| 6618 | { |
| 6619 | defaux.vda_name = n->version_needed->name_indx; |
| 6620 | _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, |
| 6621 | defaux.vda_name); |
| 6622 | } |
| 6623 | if (n->next == NULL) |
| 6624 | defaux.vda_next = 0; |
| 6625 | else |
| 6626 | defaux.vda_next = sizeof (Elf_External_Verdaux); |
| 6627 | |
| 6628 | _bfd_elf_swap_verdaux_out (output_bfd, &defaux, |
| 6629 | (Elf_External_Verdaux *) p); |
| 6630 | p += sizeof (Elf_External_Verdaux); |
| 6631 | } |
| 6632 | } |
| 6633 | |
| 6634 | elf_tdata (output_bfd)->cverdefs = cdefs; |
| 6635 | } |
| 6636 | } |
| 6637 | |
| 6638 | bed = get_elf_backend_data (output_bfd); |
| 6639 | |
| 6640 | if (info->gc_sections && bed->can_gc_sections) |
| 6641 | { |
| 6642 | struct elf_gc_sweep_symbol_info sweep_info; |
| 6643 | |
| 6644 | /* Remove the symbols that were in the swept sections from the |
| 6645 | dynamic symbol table. */ |
| 6646 | sweep_info.info = info; |
| 6647 | sweep_info.hide_symbol = bed->elf_backend_hide_symbol; |
| 6648 | elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol, |
| 6649 | &sweep_info); |
| 6650 | } |
| 6651 | |
| 6652 | if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created) |
| 6653 | { |
| 6654 | asection *s; |
| 6655 | struct elf_find_verdep_info sinfo; |
| 6656 | |
| 6657 | /* Work out the size of the version reference section. */ |
| 6658 | |
| 6659 | s = bfd_get_linker_section (dynobj, ".gnu.version_r"); |
| 6660 | BFD_ASSERT (s != NULL); |
| 6661 | |
| 6662 | sinfo.info = info; |
| 6663 | sinfo.vers = elf_tdata (output_bfd)->cverdefs; |
| 6664 | if (sinfo.vers == 0) |
| 6665 | sinfo.vers = 1; |
| 6666 | sinfo.failed = FALSE; |
| 6667 | |
| 6668 | elf_link_hash_traverse (elf_hash_table (info), |
| 6669 | _bfd_elf_link_find_version_dependencies, |
| 6670 | &sinfo); |
| 6671 | if (sinfo.failed) |
| 6672 | return FALSE; |
| 6673 | |
| 6674 | if (elf_tdata (output_bfd)->verref == NULL) |
| 6675 | s->flags |= SEC_EXCLUDE; |
| 6676 | else |
| 6677 | { |
| 6678 | Elf_Internal_Verneed *vn; |
| 6679 | unsigned int size; |
| 6680 | unsigned int crefs; |
| 6681 | bfd_byte *p; |
| 6682 | |
| 6683 | /* Build the version dependency section. */ |
| 6684 | size = 0; |
| 6685 | crefs = 0; |
| 6686 | for (vn = elf_tdata (output_bfd)->verref; |
| 6687 | vn != NULL; |
| 6688 | vn = vn->vn_nextref) |
| 6689 | { |
| 6690 | Elf_Internal_Vernaux *a; |
| 6691 | |
| 6692 | size += sizeof (Elf_External_Verneed); |
| 6693 | ++crefs; |
| 6694 | for (a = vn->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 6695 | size += sizeof (Elf_External_Vernaux); |
| 6696 | } |
| 6697 | |
| 6698 | s->size = size; |
| 6699 | s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size); |
| 6700 | if (s->contents == NULL) |
| 6701 | return FALSE; |
| 6702 | |
| 6703 | p = s->contents; |
| 6704 | for (vn = elf_tdata (output_bfd)->verref; |
| 6705 | vn != NULL; |
| 6706 | vn = vn->vn_nextref) |
| 6707 | { |
| 6708 | unsigned int caux; |
| 6709 | Elf_Internal_Vernaux *a; |
| 6710 | size_t indx; |
| 6711 | |
| 6712 | caux = 0; |
| 6713 | for (a = vn->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 6714 | ++caux; |
| 6715 | |
| 6716 | vn->vn_version = VER_NEED_CURRENT; |
| 6717 | vn->vn_cnt = caux; |
| 6718 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 6719 | elf_dt_name (vn->vn_bfd) != NULL |
| 6720 | ? elf_dt_name (vn->vn_bfd) |
| 6721 | : lbasename (vn->vn_bfd->filename), |
| 6722 | FALSE); |
| 6723 | if (indx == (size_t) -1) |
| 6724 | return FALSE; |
| 6725 | vn->vn_file = indx; |
| 6726 | vn->vn_aux = sizeof (Elf_External_Verneed); |
| 6727 | if (vn->vn_nextref == NULL) |
| 6728 | vn->vn_next = 0; |
| 6729 | else |
| 6730 | vn->vn_next = (sizeof (Elf_External_Verneed) |
| 6731 | + caux * sizeof (Elf_External_Vernaux)); |
| 6732 | |
| 6733 | _bfd_elf_swap_verneed_out (output_bfd, vn, |
| 6734 | (Elf_External_Verneed *) p); |
| 6735 | p += sizeof (Elf_External_Verneed); |
| 6736 | |
| 6737 | for (a = vn->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 6738 | { |
| 6739 | a->vna_hash = bfd_elf_hash (a->vna_nodename); |
| 6740 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 6741 | a->vna_nodename, FALSE); |
| 6742 | if (indx == (size_t) -1) |
| 6743 | return FALSE; |
| 6744 | a->vna_name = indx; |
| 6745 | if (a->vna_nextptr == NULL) |
| 6746 | a->vna_next = 0; |
| 6747 | else |
| 6748 | a->vna_next = sizeof (Elf_External_Vernaux); |
| 6749 | |
| 6750 | _bfd_elf_swap_vernaux_out (output_bfd, a, |
| 6751 | (Elf_External_Vernaux *) p); |
| 6752 | p += sizeof (Elf_External_Vernaux); |
| 6753 | } |
| 6754 | } |
| 6755 | |
| 6756 | elf_tdata (output_bfd)->cverrefs = crefs; |
| 6757 | } |
| 6758 | } |
| 6759 | |
| 6760 | /* Any syms created from now on start with -1 in |
| 6761 | got.refcount/offset and plt.refcount/offset. */ |
| 6762 | elf_hash_table (info)->init_got_refcount |
| 6763 | = elf_hash_table (info)->init_got_offset; |
| 6764 | elf_hash_table (info)->init_plt_refcount |
| 6765 | = elf_hash_table (info)->init_plt_offset; |
| 6766 | |
| 6767 | if (bfd_link_relocatable (info) |
| 6768 | && !_bfd_elf_size_group_sections (info)) |
| 6769 | return FALSE; |
| 6770 | |
| 6771 | /* The backend may have to create some sections regardless of whether |
| 6772 | we're dynamic or not. */ |
| 6773 | if (bed->elf_backend_always_size_sections |
| 6774 | && ! (*bed->elf_backend_always_size_sections) (output_bfd, info)) |
| 6775 | return FALSE; |
| 6776 | |
| 6777 | /* Determine any GNU_STACK segment requirements, after the backend |
| 6778 | has had a chance to set a default segment size. */ |
| 6779 | if (info->execstack) |
| 6780 | elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X; |
| 6781 | else if (info->noexecstack) |
| 6782 | elf_stack_flags (output_bfd) = PF_R | PF_W; |
| 6783 | else |
| 6784 | { |
| 6785 | bfd *inputobj; |
| 6786 | asection *notesec = NULL; |
| 6787 | int exec = 0; |
| 6788 | |
| 6789 | for (inputobj = info->input_bfds; |
| 6790 | inputobj; |
| 6791 | inputobj = inputobj->link.next) |
| 6792 | { |
| 6793 | asection *s; |
| 6794 | |
| 6795 | if (inputobj->flags |
| 6796 | & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED)) |
| 6797 | continue; |
| 6798 | s = inputobj->sections; |
| 6799 | if (s == NULL || s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS) |
| 6800 | continue; |
| 6801 | |
| 6802 | s = bfd_get_section_by_name (inputobj, ".note.GNU-stack"); |
| 6803 | if (s) |
| 6804 | { |
| 6805 | if (s->flags & SEC_CODE) |
| 6806 | exec = PF_X; |
| 6807 | notesec = s; |
| 6808 | } |
| 6809 | else if (bed->default_execstack) |
| 6810 | exec = PF_X; |
| 6811 | } |
| 6812 | if (notesec || info->stacksize > 0) |
| 6813 | elf_stack_flags (output_bfd) = PF_R | PF_W | exec; |
| 6814 | if (notesec && exec && bfd_link_relocatable (info) |
| 6815 | && notesec->output_section != bfd_abs_section_ptr) |
| 6816 | notesec->output_section->flags |= SEC_CODE; |
| 6817 | } |
| 6818 | |
| 6819 | if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created) |
| 6820 | { |
| 6821 | struct elf_info_failed eif; |
| 6822 | struct elf_link_hash_entry *h; |
| 6823 | asection *dynstr; |
| 6824 | asection *s; |
| 6825 | |
| 6826 | *sinterpptr = bfd_get_linker_section (dynobj, ".interp"); |
| 6827 | BFD_ASSERT (*sinterpptr != NULL || !bfd_link_executable (info) || info->nointerp); |
| 6828 | |
| 6829 | if (info->symbolic) |
| 6830 | { |
| 6831 | if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0)) |
| 6832 | return FALSE; |
| 6833 | info->flags |= DF_SYMBOLIC; |
| 6834 | } |
| 6835 | |
| 6836 | if (rpath != NULL) |
| 6837 | { |
| 6838 | size_t indx; |
| 6839 | bfd_vma tag; |
| 6840 | |
| 6841 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath, |
| 6842 | TRUE); |
| 6843 | if (indx == (size_t) -1) |
| 6844 | return FALSE; |
| 6845 | |
| 6846 | tag = info->new_dtags ? DT_RUNPATH : DT_RPATH; |
| 6847 | if (!_bfd_elf_add_dynamic_entry (info, tag, indx)) |
| 6848 | return FALSE; |
| 6849 | } |
| 6850 | |
| 6851 | if (filter_shlib != NULL) |
| 6852 | { |
| 6853 | size_t indx; |
| 6854 | |
| 6855 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 6856 | filter_shlib, TRUE); |
| 6857 | if (indx == (size_t) -1 |
| 6858 | || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx)) |
| 6859 | return FALSE; |
| 6860 | } |
| 6861 | |
| 6862 | if (auxiliary_filters != NULL) |
| 6863 | { |
| 6864 | const char * const *p; |
| 6865 | |
| 6866 | for (p = auxiliary_filters; *p != NULL; p++) |
| 6867 | { |
| 6868 | size_t indx; |
| 6869 | |
| 6870 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 6871 | *p, TRUE); |
| 6872 | if (indx == (size_t) -1 |
| 6873 | || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx)) |
| 6874 | return FALSE; |
| 6875 | } |
| 6876 | } |
| 6877 | |
| 6878 | if (audit != NULL) |
| 6879 | { |
| 6880 | size_t indx; |
| 6881 | |
| 6882 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit, |
| 6883 | TRUE); |
| 6884 | if (indx == (size_t) -1 |
| 6885 | || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx)) |
| 6886 | return FALSE; |
| 6887 | } |
| 6888 | |
| 6889 | if (depaudit != NULL) |
| 6890 | { |
| 6891 | size_t indx; |
| 6892 | |
| 6893 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit, |
| 6894 | TRUE); |
| 6895 | if (indx == (size_t) -1 |
| 6896 | || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx)) |
| 6897 | return FALSE; |
| 6898 | } |
| 6899 | |
| 6900 | eif.info = info; |
| 6901 | eif.failed = FALSE; |
| 6902 | |
| 6903 | /* Find all symbols which were defined in a dynamic object and make |
| 6904 | the backend pick a reasonable value for them. */ |
| 6905 | elf_link_hash_traverse (elf_hash_table (info), |
| 6906 | _bfd_elf_adjust_dynamic_symbol, |
| 6907 | &eif); |
| 6908 | if (eif.failed) |
| 6909 | return FALSE; |
| 6910 | |
| 6911 | /* Add some entries to the .dynamic section. We fill in some of the |
| 6912 | values later, in bfd_elf_final_link, but we must add the entries |
| 6913 | now so that we know the final size of the .dynamic section. */ |
| 6914 | |
| 6915 | /* If there are initialization and/or finalization functions to |
| 6916 | call then add the corresponding DT_INIT/DT_FINI entries. */ |
| 6917 | h = (info->init_function |
| 6918 | ? elf_link_hash_lookup (elf_hash_table (info), |
| 6919 | info->init_function, FALSE, |
| 6920 | FALSE, FALSE) |
| 6921 | : NULL); |
| 6922 | if (h != NULL |
| 6923 | && (h->ref_regular |
| 6924 | || h->def_regular)) |
| 6925 | { |
| 6926 | if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0)) |
| 6927 | return FALSE; |
| 6928 | } |
| 6929 | h = (info->fini_function |
| 6930 | ? elf_link_hash_lookup (elf_hash_table (info), |
| 6931 | info->fini_function, FALSE, |
| 6932 | FALSE, FALSE) |
| 6933 | : NULL); |
| 6934 | if (h != NULL |
| 6935 | && (h->ref_regular |
| 6936 | || h->def_regular)) |
| 6937 | { |
| 6938 | if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0)) |
| 6939 | return FALSE; |
| 6940 | } |
| 6941 | |
| 6942 | s = bfd_get_section_by_name (output_bfd, ".preinit_array"); |
| 6943 | if (s != NULL && s->linker_has_input) |
| 6944 | { |
| 6945 | /* DT_PREINIT_ARRAY is not allowed in shared library. */ |
| 6946 | if (! bfd_link_executable (info)) |
| 6947 | { |
| 6948 | bfd *sub; |
| 6949 | asection *o; |
| 6950 | |
| 6951 | for (sub = info->input_bfds; sub != NULL; sub = sub->link.next) |
| 6952 | if (bfd_get_flavour (sub) == bfd_target_elf_flavour |
| 6953 | && (o = sub->sections) != NULL |
| 6954 | && o->sec_info_type != SEC_INFO_TYPE_JUST_SYMS) |
| 6955 | for (o = sub->sections; o != NULL; o = o->next) |
| 6956 | if (elf_section_data (o)->this_hdr.sh_type |
| 6957 | == SHT_PREINIT_ARRAY) |
| 6958 | { |
| 6959 | _bfd_error_handler |
| 6960 | (_("%pB: .preinit_array section is not allowed in DSO"), |
| 6961 | sub); |
| 6962 | break; |
| 6963 | } |
| 6964 | |
| 6965 | bfd_set_error (bfd_error_nonrepresentable_section); |
| 6966 | return FALSE; |
| 6967 | } |
| 6968 | |
| 6969 | if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0) |
| 6970 | || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0)) |
| 6971 | return FALSE; |
| 6972 | } |
| 6973 | s = bfd_get_section_by_name (output_bfd, ".init_array"); |
| 6974 | if (s != NULL && s->linker_has_input) |
| 6975 | { |
| 6976 | if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0) |
| 6977 | || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0)) |
| 6978 | return FALSE; |
| 6979 | } |
| 6980 | s = bfd_get_section_by_name (output_bfd, ".fini_array"); |
| 6981 | if (s != NULL && s->linker_has_input) |
| 6982 | { |
| 6983 | if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0) |
| 6984 | || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0)) |
| 6985 | return FALSE; |
| 6986 | } |
| 6987 | |
| 6988 | dynstr = bfd_get_linker_section (dynobj, ".dynstr"); |
| 6989 | /* If .dynstr is excluded from the link, we don't want any of |
| 6990 | these tags. Strictly, we should be checking each section |
| 6991 | individually; This quick check covers for the case where |
| 6992 | someone does a /DISCARD/ : { *(*) }. */ |
| 6993 | if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr) |
| 6994 | { |
| 6995 | bfd_size_type strsize; |
| 6996 | |
| 6997 | strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr); |
| 6998 | if ((info->emit_hash |
| 6999 | && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0)) |
| 7000 | || (info->emit_gnu_hash |
| 7001 | && (bed->record_xhash_symbol == NULL |
| 7002 | && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))) |
| 7003 | || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0) |
| 7004 | || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0) |
| 7005 | || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize) |
| 7006 | || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT, |
| 7007 | bed->s->sizeof_sym)) |
| 7008 | return FALSE; |
| 7009 | } |
| 7010 | } |
| 7011 | |
| 7012 | if (! _bfd_elf_maybe_strip_eh_frame_hdr (info)) |
| 7013 | return FALSE; |
| 7014 | |
| 7015 | /* The backend must work out the sizes of all the other dynamic |
| 7016 | sections. */ |
| 7017 | if (dynobj != NULL |
| 7018 | && bed->elf_backend_size_dynamic_sections != NULL |
| 7019 | && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info)) |
| 7020 | return FALSE; |
| 7021 | |
| 7022 | if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created) |
| 7023 | { |
| 7024 | if (elf_tdata (output_bfd)->cverdefs) |
| 7025 | { |
| 7026 | unsigned int crefs = elf_tdata (output_bfd)->cverdefs; |
| 7027 | |
| 7028 | if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0) |
| 7029 | || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, crefs)) |
| 7030 | return FALSE; |
| 7031 | } |
| 7032 | |
| 7033 | if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS)) |
| 7034 | { |
| 7035 | if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags)) |
| 7036 | return FALSE; |
| 7037 | } |
| 7038 | else if (info->flags & DF_BIND_NOW) |
| 7039 | { |
| 7040 | if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0)) |
| 7041 | return FALSE; |
| 7042 | } |
| 7043 | |
| 7044 | if (info->flags_1) |
| 7045 | { |
| 7046 | if (bfd_link_executable (info)) |
| 7047 | info->flags_1 &= ~ (DF_1_INITFIRST |
| 7048 | | DF_1_NODELETE |
| 7049 | | DF_1_NOOPEN); |
| 7050 | if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1)) |
| 7051 | return FALSE; |
| 7052 | } |
| 7053 | |
| 7054 | if (elf_tdata (output_bfd)->cverrefs) |
| 7055 | { |
| 7056 | unsigned int crefs = elf_tdata (output_bfd)->cverrefs; |
| 7057 | |
| 7058 | if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0) |
| 7059 | || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs)) |
| 7060 | return FALSE; |
| 7061 | } |
| 7062 | |
| 7063 | if ((elf_tdata (output_bfd)->cverrefs == 0 |
| 7064 | && elf_tdata (output_bfd)->cverdefs == 0) |
| 7065 | || _bfd_elf_link_renumber_dynsyms (output_bfd, info, NULL) <= 1) |
| 7066 | { |
| 7067 | asection *s; |
| 7068 | |
| 7069 | s = bfd_get_linker_section (dynobj, ".gnu.version"); |
| 7070 | s->flags |= SEC_EXCLUDE; |
| 7071 | } |
| 7072 | } |
| 7073 | return TRUE; |
| 7074 | } |
| 7075 | |
| 7076 | /* Find the first non-excluded output section. We'll use its |
| 7077 | section symbol for some emitted relocs. */ |
| 7078 | void |
| 7079 | _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info) |
| 7080 | { |
| 7081 | asection *s; |
| 7082 | asection *found = NULL; |
| 7083 | |
| 7084 | for (s = output_bfd->sections; s != NULL; s = s->next) |
| 7085 | if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC |
| 7086 | && !_bfd_elf_omit_section_dynsym_default (output_bfd, info, s)) |
| 7087 | { |
| 7088 | found = s; |
| 7089 | if ((s->flags & SEC_THREAD_LOCAL) == 0) |
| 7090 | break; |
| 7091 | } |
| 7092 | elf_hash_table (info)->text_index_section = found; |
| 7093 | } |
| 7094 | |
| 7095 | /* Find two non-excluded output sections, one for code, one for data. |
| 7096 | We'll use their section symbols for some emitted relocs. */ |
| 7097 | void |
| 7098 | _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info) |
| 7099 | { |
| 7100 | asection *s; |
| 7101 | asection *found = NULL; |
| 7102 | |
| 7103 | /* Data first, since setting text_index_section changes |
| 7104 | _bfd_elf_omit_section_dynsym_default. */ |
| 7105 | for (s = output_bfd->sections; s != NULL; s = s->next) |
| 7106 | if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC |
| 7107 | && !(s->flags & SEC_READONLY) |
| 7108 | && !_bfd_elf_omit_section_dynsym_default (output_bfd, info, s)) |
| 7109 | { |
| 7110 | found = s; |
| 7111 | if ((s->flags & SEC_THREAD_LOCAL) == 0) |
| 7112 | break; |
| 7113 | } |
| 7114 | elf_hash_table (info)->data_index_section = found; |
| 7115 | |
| 7116 | for (s = output_bfd->sections; s != NULL; s = s->next) |
| 7117 | if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC |
| 7118 | && (s->flags & SEC_READONLY) |
| 7119 | && !_bfd_elf_omit_section_dynsym_default (output_bfd, info, s)) |
| 7120 | { |
| 7121 | found = s; |
| 7122 | break; |
| 7123 | } |
| 7124 | elf_hash_table (info)->text_index_section = found; |
| 7125 | } |
| 7126 | |
| 7127 | #define GNU_HASH_SECTION_NAME(bed) \ |
| 7128 | (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash" |
| 7129 | |
| 7130 | bfd_boolean |
| 7131 | bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info) |
| 7132 | { |
| 7133 | const struct elf_backend_data *bed; |
| 7134 | unsigned long section_sym_count; |
| 7135 | bfd_size_type dynsymcount = 0; |
| 7136 | |
| 7137 | if (!is_elf_hash_table (info->hash)) |
| 7138 | return TRUE; |
| 7139 | |
| 7140 | bed = get_elf_backend_data (output_bfd); |
| 7141 | (*bed->elf_backend_init_index_section) (output_bfd, info); |
| 7142 | |
| 7143 | /* Assign dynsym indices. In a shared library we generate a section |
| 7144 | symbol for each output section, which come first. Next come all |
| 7145 | of the back-end allocated local dynamic syms, followed by the rest |
| 7146 | of the global symbols. |
| 7147 | |
| 7148 | This is usually not needed for static binaries, however backends |
| 7149 | can request to always do it, e.g. the MIPS backend uses dynamic |
| 7150 | symbol counts to lay out GOT, which will be produced in the |
| 7151 | presence of GOT relocations even in static binaries (holding fixed |
| 7152 | data in that case, to satisfy those relocations). */ |
| 7153 | |
| 7154 | if (elf_hash_table (info)->dynamic_sections_created |
| 7155 | || bed->always_renumber_dynsyms) |
| 7156 | dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info, |
| 7157 | §ion_sym_count); |
| 7158 | |
| 7159 | if (elf_hash_table (info)->dynamic_sections_created) |
| 7160 | { |
| 7161 | bfd *dynobj; |
| 7162 | asection *s; |
| 7163 | unsigned int dtagcount; |
| 7164 | |
| 7165 | dynobj = elf_hash_table (info)->dynobj; |
| 7166 | |
| 7167 | /* Work out the size of the symbol version section. */ |
| 7168 | s = bfd_get_linker_section (dynobj, ".gnu.version"); |
| 7169 | BFD_ASSERT (s != NULL); |
| 7170 | if ((s->flags & SEC_EXCLUDE) == 0) |
| 7171 | { |
| 7172 | s->size = dynsymcount * sizeof (Elf_External_Versym); |
| 7173 | s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size); |
| 7174 | if (s->contents == NULL) |
| 7175 | return FALSE; |
| 7176 | |
| 7177 | if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0)) |
| 7178 | return FALSE; |
| 7179 | } |
| 7180 | |
| 7181 | /* Set the size of the .dynsym and .hash sections. We counted |
| 7182 | the number of dynamic symbols in elf_link_add_object_symbols. |
| 7183 | We will build the contents of .dynsym and .hash when we build |
| 7184 | the final symbol table, because until then we do not know the |
| 7185 | correct value to give the symbols. We built the .dynstr |
| 7186 | section as we went along in elf_link_add_object_symbols. */ |
| 7187 | s = elf_hash_table (info)->dynsym; |
| 7188 | BFD_ASSERT (s != NULL); |
| 7189 | s->size = dynsymcount * bed->s->sizeof_sym; |
| 7190 | |
| 7191 | s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size); |
| 7192 | if (s->contents == NULL) |
| 7193 | return FALSE; |
| 7194 | |
| 7195 | /* The first entry in .dynsym is a dummy symbol. Clear all the |
| 7196 | section syms, in case we don't output them all. */ |
| 7197 | ++section_sym_count; |
| 7198 | memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym); |
| 7199 | |
| 7200 | elf_hash_table (info)->bucketcount = 0; |
| 7201 | |
| 7202 | /* Compute the size of the hashing table. As a side effect this |
| 7203 | computes the hash values for all the names we export. */ |
| 7204 | if (info->emit_hash) |
| 7205 | { |
| 7206 | unsigned long int *hashcodes; |
| 7207 | struct hash_codes_info hashinf; |
| 7208 | bfd_size_type amt; |
| 7209 | unsigned long int nsyms; |
| 7210 | size_t bucketcount; |
| 7211 | size_t hash_entry_size; |
| 7212 | |
| 7213 | /* Compute the hash values for all exported symbols. At the same |
| 7214 | time store the values in an array so that we could use them for |
| 7215 | optimizations. */ |
| 7216 | amt = dynsymcount * sizeof (unsigned long int); |
| 7217 | hashcodes = (unsigned long int *) bfd_malloc (amt); |
| 7218 | if (hashcodes == NULL) |
| 7219 | return FALSE; |
| 7220 | hashinf.hashcodes = hashcodes; |
| 7221 | hashinf.error = FALSE; |
| 7222 | |
| 7223 | /* Put all hash values in HASHCODES. */ |
| 7224 | elf_link_hash_traverse (elf_hash_table (info), |
| 7225 | elf_collect_hash_codes, &hashinf); |
| 7226 | if (hashinf.error) |
| 7227 | { |
| 7228 | free (hashcodes); |
| 7229 | return FALSE; |
| 7230 | } |
| 7231 | |
| 7232 | nsyms = hashinf.hashcodes - hashcodes; |
| 7233 | bucketcount |
| 7234 | = compute_bucket_count (info, hashcodes, nsyms, 0); |
| 7235 | free (hashcodes); |
| 7236 | |
| 7237 | if (bucketcount == 0 && nsyms > 0) |
| 7238 | return FALSE; |
| 7239 | |
| 7240 | elf_hash_table (info)->bucketcount = bucketcount; |
| 7241 | |
| 7242 | s = bfd_get_linker_section (dynobj, ".hash"); |
| 7243 | BFD_ASSERT (s != NULL); |
| 7244 | hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize; |
| 7245 | s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size); |
| 7246 | s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size); |
| 7247 | if (s->contents == NULL) |
| 7248 | return FALSE; |
| 7249 | |
| 7250 | bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents); |
| 7251 | bfd_put (8 * hash_entry_size, output_bfd, dynsymcount, |
| 7252 | s->contents + hash_entry_size); |
| 7253 | } |
| 7254 | |
| 7255 | if (info->emit_gnu_hash) |
| 7256 | { |
| 7257 | size_t i, cnt; |
| 7258 | unsigned char *contents; |
| 7259 | struct collect_gnu_hash_codes cinfo; |
| 7260 | bfd_size_type amt; |
| 7261 | size_t bucketcount; |
| 7262 | |
| 7263 | memset (&cinfo, 0, sizeof (cinfo)); |
| 7264 | |
| 7265 | /* Compute the hash values for all exported symbols. At the same |
| 7266 | time store the values in an array so that we could use them for |
| 7267 | optimizations. */ |
| 7268 | amt = dynsymcount * 2 * sizeof (unsigned long int); |
| 7269 | cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt); |
| 7270 | if (cinfo.hashcodes == NULL) |
| 7271 | return FALSE; |
| 7272 | |
| 7273 | cinfo.hashval = cinfo.hashcodes + dynsymcount; |
| 7274 | cinfo.min_dynindx = -1; |
| 7275 | cinfo.output_bfd = output_bfd; |
| 7276 | cinfo.bed = bed; |
| 7277 | |
| 7278 | /* Put all hash values in HASHCODES. */ |
| 7279 | elf_link_hash_traverse (elf_hash_table (info), |
| 7280 | elf_collect_gnu_hash_codes, &cinfo); |
| 7281 | if (cinfo.error) |
| 7282 | { |
| 7283 | free (cinfo.hashcodes); |
| 7284 | return FALSE; |
| 7285 | } |
| 7286 | |
| 7287 | bucketcount |
| 7288 | = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1); |
| 7289 | |
| 7290 | if (bucketcount == 0) |
| 7291 | { |
| 7292 | free (cinfo.hashcodes); |
| 7293 | return FALSE; |
| 7294 | } |
| 7295 | |
| 7296 | s = bfd_get_linker_section (dynobj, GNU_HASH_SECTION_NAME (bed)); |
| 7297 | BFD_ASSERT (s != NULL); |
| 7298 | |
| 7299 | if (cinfo.nsyms == 0) |
| 7300 | { |
| 7301 | /* Empty .gnu.hash or .MIPS.xhash section is special. */ |
| 7302 | BFD_ASSERT (cinfo.min_dynindx == -1); |
| 7303 | free (cinfo.hashcodes); |
| 7304 | s->size = 5 * 4 + bed->s->arch_size / 8; |
| 7305 | contents = (unsigned char *) bfd_zalloc (output_bfd, s->size); |
| 7306 | if (contents == NULL) |
| 7307 | return FALSE; |
| 7308 | s->contents = contents; |
| 7309 | /* 1 empty bucket. */ |
| 7310 | bfd_put_32 (output_bfd, 1, contents); |
| 7311 | /* SYMIDX above the special symbol 0. */ |
| 7312 | bfd_put_32 (output_bfd, 1, contents + 4); |
| 7313 | /* Just one word for bitmask. */ |
| 7314 | bfd_put_32 (output_bfd, 1, contents + 8); |
| 7315 | /* Only hash fn bloom filter. */ |
| 7316 | bfd_put_32 (output_bfd, 0, contents + 12); |
| 7317 | /* No hashes are valid - empty bitmask. */ |
| 7318 | bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16); |
| 7319 | /* No hashes in the only bucket. */ |
| 7320 | bfd_put_32 (output_bfd, 0, |
| 7321 | contents + 16 + bed->s->arch_size / 8); |
| 7322 | } |
| 7323 | else |
| 7324 | { |
| 7325 | unsigned long int maskwords, maskbitslog2, x; |
| 7326 | BFD_ASSERT (cinfo.min_dynindx != -1); |
| 7327 | |
| 7328 | x = cinfo.nsyms; |
| 7329 | maskbitslog2 = 1; |
| 7330 | while ((x >>= 1) != 0) |
| 7331 | ++maskbitslog2; |
| 7332 | if (maskbitslog2 < 3) |
| 7333 | maskbitslog2 = 5; |
| 7334 | else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms) |
| 7335 | maskbitslog2 = maskbitslog2 + 3; |
| 7336 | else |
| 7337 | maskbitslog2 = maskbitslog2 + 2; |
| 7338 | if (bed->s->arch_size == 64) |
| 7339 | { |
| 7340 | if (maskbitslog2 == 5) |
| 7341 | maskbitslog2 = 6; |
| 7342 | cinfo.shift1 = 6; |
| 7343 | } |
| 7344 | else |
| 7345 | cinfo.shift1 = 5; |
| 7346 | cinfo.mask = (1 << cinfo.shift1) - 1; |
| 7347 | cinfo.shift2 = maskbitslog2; |
| 7348 | cinfo.maskbits = 1 << maskbitslog2; |
| 7349 | maskwords = 1 << (maskbitslog2 - cinfo.shift1); |
| 7350 | amt = bucketcount * sizeof (unsigned long int) * 2; |
| 7351 | amt += maskwords * sizeof (bfd_vma); |
| 7352 | cinfo.bitmask = (bfd_vma *) bfd_malloc (amt); |
| 7353 | if (cinfo.bitmask == NULL) |
| 7354 | { |
| 7355 | free (cinfo.hashcodes); |
| 7356 | return FALSE; |
| 7357 | } |
| 7358 | |
| 7359 | cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords); |
| 7360 | cinfo.indx = cinfo.counts + bucketcount; |
| 7361 | cinfo.symindx = dynsymcount - cinfo.nsyms; |
| 7362 | memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma)); |
| 7363 | |
| 7364 | /* Determine how often each hash bucket is used. */ |
| 7365 | memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0])); |
| 7366 | for (i = 0; i < cinfo.nsyms; ++i) |
| 7367 | ++cinfo.counts[cinfo.hashcodes[i] % bucketcount]; |
| 7368 | |
| 7369 | for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i) |
| 7370 | if (cinfo.counts[i] != 0) |
| 7371 | { |
| 7372 | cinfo.indx[i] = cnt; |
| 7373 | cnt += cinfo.counts[i]; |
| 7374 | } |
| 7375 | BFD_ASSERT (cnt == dynsymcount); |
| 7376 | cinfo.bucketcount = bucketcount; |
| 7377 | cinfo.local_indx = cinfo.min_dynindx; |
| 7378 | |
| 7379 | s->size = (4 + bucketcount + cinfo.nsyms) * 4; |
| 7380 | s->size += cinfo.maskbits / 8; |
| 7381 | if (bed->record_xhash_symbol != NULL) |
| 7382 | s->size += cinfo.nsyms * 4; |
| 7383 | contents = (unsigned char *) bfd_zalloc (output_bfd, s->size); |
| 7384 | if (contents == NULL) |
| 7385 | { |
| 7386 | free (cinfo.bitmask); |
| 7387 | free (cinfo.hashcodes); |
| 7388 | return FALSE; |
| 7389 | } |
| 7390 | |
| 7391 | s->contents = contents; |
| 7392 | bfd_put_32 (output_bfd, bucketcount, contents); |
| 7393 | bfd_put_32 (output_bfd, cinfo.symindx, contents + 4); |
| 7394 | bfd_put_32 (output_bfd, maskwords, contents + 8); |
| 7395 | bfd_put_32 (output_bfd, cinfo.shift2, contents + 12); |
| 7396 | contents += 16 + cinfo.maskbits / 8; |
| 7397 | |
| 7398 | for (i = 0; i < bucketcount; ++i) |
| 7399 | { |
| 7400 | if (cinfo.counts[i] == 0) |
| 7401 | bfd_put_32 (output_bfd, 0, contents); |
| 7402 | else |
| 7403 | bfd_put_32 (output_bfd, cinfo.indx[i], contents); |
| 7404 | contents += 4; |
| 7405 | } |
| 7406 | |
| 7407 | cinfo.contents = contents; |
| 7408 | |
| 7409 | cinfo.xlat = contents + cinfo.nsyms * 4 - s->contents; |
| 7410 | /* Renumber dynamic symbols, if populating .gnu.hash section. |
| 7411 | If using .MIPS.xhash, populate the translation table. */ |
| 7412 | elf_link_hash_traverse (elf_hash_table (info), |
| 7413 | elf_gnu_hash_process_symidx, &cinfo); |
| 7414 | |
| 7415 | contents = s->contents + 16; |
| 7416 | for (i = 0; i < maskwords; ++i) |
| 7417 | { |
| 7418 | bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i], |
| 7419 | contents); |
| 7420 | contents += bed->s->arch_size / 8; |
| 7421 | } |
| 7422 | |
| 7423 | free (cinfo.bitmask); |
| 7424 | free (cinfo.hashcodes); |
| 7425 | } |
| 7426 | } |
| 7427 | |
| 7428 | s = bfd_get_linker_section (dynobj, ".dynstr"); |
| 7429 | BFD_ASSERT (s != NULL); |
| 7430 | |
| 7431 | elf_finalize_dynstr (output_bfd, info); |
| 7432 | |
| 7433 | s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr); |
| 7434 | |
| 7435 | for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount) |
| 7436 | if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0)) |
| 7437 | return FALSE; |
| 7438 | } |
| 7439 | |
| 7440 | return TRUE; |
| 7441 | } |
| 7442 | \f |
| 7443 | /* Make sure sec_info_type is cleared if sec_info is cleared too. */ |
| 7444 | |
| 7445 | static void |
| 7446 | merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED, |
| 7447 | asection *sec) |
| 7448 | { |
| 7449 | BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE); |
| 7450 | sec->sec_info_type = SEC_INFO_TYPE_NONE; |
| 7451 | } |
| 7452 | |
| 7453 | /* Finish SHF_MERGE section merging. */ |
| 7454 | |
| 7455 | bfd_boolean |
| 7456 | _bfd_elf_merge_sections (bfd *obfd, struct bfd_link_info *info) |
| 7457 | { |
| 7458 | bfd *ibfd; |
| 7459 | asection *sec; |
| 7460 | |
| 7461 | if (!is_elf_hash_table (info->hash)) |
| 7462 | return FALSE; |
| 7463 | |
| 7464 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) |
| 7465 | if ((ibfd->flags & DYNAMIC) == 0 |
| 7466 | && bfd_get_flavour (ibfd) == bfd_target_elf_flavour |
| 7467 | && (elf_elfheader (ibfd)->e_ident[EI_CLASS] |
| 7468 | == get_elf_backend_data (obfd)->s->elfclass)) |
| 7469 | for (sec = ibfd->sections; sec != NULL; sec = sec->next) |
| 7470 | if ((sec->flags & SEC_MERGE) != 0 |
| 7471 | && !bfd_is_abs_section (sec->output_section)) |
| 7472 | { |
| 7473 | struct bfd_elf_section_data *secdata; |
| 7474 | |
| 7475 | secdata = elf_section_data (sec); |
| 7476 | if (! _bfd_add_merge_section (obfd, |
| 7477 | &elf_hash_table (info)->merge_info, |
| 7478 | sec, &secdata->sec_info)) |
| 7479 | return FALSE; |
| 7480 | else if (secdata->sec_info) |
| 7481 | sec->sec_info_type = SEC_INFO_TYPE_MERGE; |
| 7482 | } |
| 7483 | |
| 7484 | if (elf_hash_table (info)->merge_info != NULL) |
| 7485 | _bfd_merge_sections (obfd, info, elf_hash_table (info)->merge_info, |
| 7486 | merge_sections_remove_hook); |
| 7487 | return TRUE; |
| 7488 | } |
| 7489 | |
| 7490 | /* Create an entry in an ELF linker hash table. */ |
| 7491 | |
| 7492 | struct bfd_hash_entry * |
| 7493 | _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry, |
| 7494 | struct bfd_hash_table *table, |
| 7495 | const char *string) |
| 7496 | { |
| 7497 | /* Allocate the structure if it has not already been allocated by a |
| 7498 | subclass. */ |
| 7499 | if (entry == NULL) |
| 7500 | { |
| 7501 | entry = (struct bfd_hash_entry *) |
| 7502 | bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry)); |
| 7503 | if (entry == NULL) |
| 7504 | return entry; |
| 7505 | } |
| 7506 | |
| 7507 | /* Call the allocation method of the superclass. */ |
| 7508 | entry = _bfd_link_hash_newfunc (entry, table, string); |
| 7509 | if (entry != NULL) |
| 7510 | { |
| 7511 | struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry; |
| 7512 | struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table; |
| 7513 | |
| 7514 | /* Set local fields. */ |
| 7515 | ret->indx = -1; |
| 7516 | ret->dynindx = -1; |
| 7517 | ret->got = htab->init_got_refcount; |
| 7518 | ret->plt = htab->init_plt_refcount; |
| 7519 | memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry) |
| 7520 | - offsetof (struct elf_link_hash_entry, size))); |
| 7521 | /* Assume that we have been called by a non-ELF symbol reader. |
| 7522 | This flag is then reset by the code which reads an ELF input |
| 7523 | file. This ensures that a symbol created by a non-ELF symbol |
| 7524 | reader will have the flag set correctly. */ |
| 7525 | ret->non_elf = 1; |
| 7526 | } |
| 7527 | |
| 7528 | return entry; |
| 7529 | } |
| 7530 | |
| 7531 | /* Copy data from an indirect symbol to its direct symbol, hiding the |
| 7532 | old indirect symbol. Also used for copying flags to a weakdef. */ |
| 7533 | |
| 7534 | void |
| 7535 | _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info, |
| 7536 | struct elf_link_hash_entry *dir, |
| 7537 | struct elf_link_hash_entry *ind) |
| 7538 | { |
| 7539 | struct elf_link_hash_table *htab; |
| 7540 | |
| 7541 | /* Copy down any references that we may have already seen to the |
| 7542 | symbol which just became indirect. */ |
| 7543 | |
| 7544 | if (dir->versioned != versioned_hidden) |
| 7545 | dir->ref_dynamic |= ind->ref_dynamic; |
| 7546 | dir->ref_regular |= ind->ref_regular; |
| 7547 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; |
| 7548 | dir->non_got_ref |= ind->non_got_ref; |
| 7549 | dir->needs_plt |= ind->needs_plt; |
| 7550 | dir->pointer_equality_needed |= ind->pointer_equality_needed; |
| 7551 | |
| 7552 | if (ind->root.type != bfd_link_hash_indirect) |
| 7553 | return; |
| 7554 | |
| 7555 | /* Copy over the global and procedure linkage table refcount entries. |
| 7556 | These may have been already set up by a check_relocs routine. */ |
| 7557 | htab = elf_hash_table (info); |
| 7558 | if (ind->got.refcount > htab->init_got_refcount.refcount) |
| 7559 | { |
| 7560 | if (dir->got.refcount < 0) |
| 7561 | dir->got.refcount = 0; |
| 7562 | dir->got.refcount += ind->got.refcount; |
| 7563 | ind->got.refcount = htab->init_got_refcount.refcount; |
| 7564 | } |
| 7565 | |
| 7566 | if (ind->plt.refcount > htab->init_plt_refcount.refcount) |
| 7567 | { |
| 7568 | if (dir->plt.refcount < 0) |
| 7569 | dir->plt.refcount = 0; |
| 7570 | dir->plt.refcount += ind->plt.refcount; |
| 7571 | ind->plt.refcount = htab->init_plt_refcount.refcount; |
| 7572 | } |
| 7573 | |
| 7574 | if (ind->dynindx != -1) |
| 7575 | { |
| 7576 | if (dir->dynindx != -1) |
| 7577 | _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index); |
| 7578 | dir->dynindx = ind->dynindx; |
| 7579 | dir->dynstr_index = ind->dynstr_index; |
| 7580 | ind->dynindx = -1; |
| 7581 | ind->dynstr_index = 0; |
| 7582 | } |
| 7583 | } |
| 7584 | |
| 7585 | void |
| 7586 | _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info, |
| 7587 | struct elf_link_hash_entry *h, |
| 7588 | bfd_boolean force_local) |
| 7589 | { |
| 7590 | /* STT_GNU_IFUNC symbol must go through PLT. */ |
| 7591 | if (h->type != STT_GNU_IFUNC) |
| 7592 | { |
| 7593 | h->plt = elf_hash_table (info)->init_plt_offset; |
| 7594 | h->needs_plt = 0; |
| 7595 | } |
| 7596 | if (force_local) |
| 7597 | { |
| 7598 | h->forced_local = 1; |
| 7599 | if (h->dynindx != -1) |
| 7600 | { |
| 7601 | _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, |
| 7602 | h->dynstr_index); |
| 7603 | h->dynindx = -1; |
| 7604 | h->dynstr_index = 0; |
| 7605 | } |
| 7606 | } |
| 7607 | } |
| 7608 | |
| 7609 | /* Hide a symbol. */ |
| 7610 | |
| 7611 | void |
| 7612 | _bfd_elf_link_hide_symbol (bfd *output_bfd, |
| 7613 | struct bfd_link_info *info, |
| 7614 | struct bfd_link_hash_entry *h) |
| 7615 | { |
| 7616 | if (is_elf_hash_table (info->hash)) |
| 7617 | { |
| 7618 | const struct elf_backend_data *bed |
| 7619 | = get_elf_backend_data (output_bfd); |
| 7620 | struct elf_link_hash_entry *eh |
| 7621 | = (struct elf_link_hash_entry *) h; |
| 7622 | bed->elf_backend_hide_symbol (info, eh, TRUE); |
| 7623 | eh->def_dynamic = 0; |
| 7624 | eh->ref_dynamic = 0; |
| 7625 | eh->dynamic_def = 0; |
| 7626 | } |
| 7627 | } |
| 7628 | |
| 7629 | /* Initialize an ELF linker hash table. *TABLE has been zeroed by our |
| 7630 | caller. */ |
| 7631 | |
| 7632 | bfd_boolean |
| 7633 | _bfd_elf_link_hash_table_init |
| 7634 | (struct elf_link_hash_table *table, |
| 7635 | bfd *abfd, |
| 7636 | struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *, |
| 7637 | struct bfd_hash_table *, |
| 7638 | const char *), |
| 7639 | unsigned int entsize, |
| 7640 | enum elf_target_id target_id) |
| 7641 | { |
| 7642 | bfd_boolean ret; |
| 7643 | int can_refcount = get_elf_backend_data (abfd)->can_refcount; |
| 7644 | |
| 7645 | table->init_got_refcount.refcount = can_refcount - 1; |
| 7646 | table->init_plt_refcount.refcount = can_refcount - 1; |
| 7647 | table->init_got_offset.offset = -(bfd_vma) 1; |
| 7648 | table->init_plt_offset.offset = -(bfd_vma) 1; |
| 7649 | /* The first dynamic symbol is a dummy. */ |
| 7650 | table->dynsymcount = 1; |
| 7651 | |
| 7652 | ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize); |
| 7653 | |
| 7654 | table->root.type = bfd_link_elf_hash_table; |
| 7655 | table->hash_table_id = target_id; |
| 7656 | |
| 7657 | return ret; |
| 7658 | } |
| 7659 | |
| 7660 | /* Create an ELF linker hash table. */ |
| 7661 | |
| 7662 | struct bfd_link_hash_table * |
| 7663 | _bfd_elf_link_hash_table_create (bfd *abfd) |
| 7664 | { |
| 7665 | struct elf_link_hash_table *ret; |
| 7666 | bfd_size_type amt = sizeof (struct elf_link_hash_table); |
| 7667 | |
| 7668 | ret = (struct elf_link_hash_table *) bfd_zmalloc (amt); |
| 7669 | if (ret == NULL) |
| 7670 | return NULL; |
| 7671 | |
| 7672 | if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc, |
| 7673 | sizeof (struct elf_link_hash_entry), |
| 7674 | GENERIC_ELF_DATA)) |
| 7675 | { |
| 7676 | free (ret); |
| 7677 | return NULL; |
| 7678 | } |
| 7679 | ret->root.hash_table_free = _bfd_elf_link_hash_table_free; |
| 7680 | |
| 7681 | return &ret->root; |
| 7682 | } |
| 7683 | |
| 7684 | /* Destroy an ELF linker hash table. */ |
| 7685 | |
| 7686 | void |
| 7687 | _bfd_elf_link_hash_table_free (bfd *obfd) |
| 7688 | { |
| 7689 | struct elf_link_hash_table *htab; |
| 7690 | |
| 7691 | htab = (struct elf_link_hash_table *) obfd->link.hash; |
| 7692 | if (htab->dynstr != NULL) |
| 7693 | _bfd_elf_strtab_free (htab->dynstr); |
| 7694 | _bfd_merge_sections_free (htab->merge_info); |
| 7695 | _bfd_generic_link_hash_table_free (obfd); |
| 7696 | } |
| 7697 | |
| 7698 | /* This is a hook for the ELF emulation code in the generic linker to |
| 7699 | tell the backend linker what file name to use for the DT_NEEDED |
| 7700 | entry for a dynamic object. */ |
| 7701 | |
| 7702 | void |
| 7703 | bfd_elf_set_dt_needed_name (bfd *abfd, const char *name) |
| 7704 | { |
| 7705 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour |
| 7706 | && bfd_get_format (abfd) == bfd_object) |
| 7707 | elf_dt_name (abfd) = name; |
| 7708 | } |
| 7709 | |
| 7710 | int |
| 7711 | bfd_elf_get_dyn_lib_class (bfd *abfd) |
| 7712 | { |
| 7713 | int lib_class; |
| 7714 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour |
| 7715 | && bfd_get_format (abfd) == bfd_object) |
| 7716 | lib_class = elf_dyn_lib_class (abfd); |
| 7717 | else |
| 7718 | lib_class = 0; |
| 7719 | return lib_class; |
| 7720 | } |
| 7721 | |
| 7722 | void |
| 7723 | bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class) |
| 7724 | { |
| 7725 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour |
| 7726 | && bfd_get_format (abfd) == bfd_object) |
| 7727 | elf_dyn_lib_class (abfd) = lib_class; |
| 7728 | } |
| 7729 | |
| 7730 | /* Get the list of DT_NEEDED entries for a link. This is a hook for |
| 7731 | the linker ELF emulation code. */ |
| 7732 | |
| 7733 | struct bfd_link_needed_list * |
| 7734 | bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED, |
| 7735 | struct bfd_link_info *info) |
| 7736 | { |
| 7737 | if (! is_elf_hash_table (info->hash)) |
| 7738 | return NULL; |
| 7739 | return elf_hash_table (info)->needed; |
| 7740 | } |
| 7741 | |
| 7742 | /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a |
| 7743 | hook for the linker ELF emulation code. */ |
| 7744 | |
| 7745 | struct bfd_link_needed_list * |
| 7746 | bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED, |
| 7747 | struct bfd_link_info *info) |
| 7748 | { |
| 7749 | if (! is_elf_hash_table (info->hash)) |
| 7750 | return NULL; |
| 7751 | return elf_hash_table (info)->runpath; |
| 7752 | } |
| 7753 | |
| 7754 | /* Get the name actually used for a dynamic object for a link. This |
| 7755 | is the SONAME entry if there is one. Otherwise, it is the string |
| 7756 | passed to bfd_elf_set_dt_needed_name, or it is the filename. */ |
| 7757 | |
| 7758 | const char * |
| 7759 | bfd_elf_get_dt_soname (bfd *abfd) |
| 7760 | { |
| 7761 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour |
| 7762 | && bfd_get_format (abfd) == bfd_object) |
| 7763 | return elf_dt_name (abfd); |
| 7764 | return NULL; |
| 7765 | } |
| 7766 | |
| 7767 | /* Get the list of DT_NEEDED entries from a BFD. This is a hook for |
| 7768 | the ELF linker emulation code. */ |
| 7769 | |
| 7770 | bfd_boolean |
| 7771 | bfd_elf_get_bfd_needed_list (bfd *abfd, |
| 7772 | struct bfd_link_needed_list **pneeded) |
| 7773 | { |
| 7774 | asection *s; |
| 7775 | bfd_byte *dynbuf = NULL; |
| 7776 | unsigned int elfsec; |
| 7777 | unsigned long shlink; |
| 7778 | bfd_byte *extdyn, *extdynend; |
| 7779 | size_t extdynsize; |
| 7780 | void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *); |
| 7781 | |
| 7782 | *pneeded = NULL; |
| 7783 | |
| 7784 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour |
| 7785 | || bfd_get_format (abfd) != bfd_object) |
| 7786 | return TRUE; |
| 7787 | |
| 7788 | s = bfd_get_section_by_name (abfd, ".dynamic"); |
| 7789 | if (s == NULL || s->size == 0) |
| 7790 | return TRUE; |
| 7791 | |
| 7792 | if (!bfd_malloc_and_get_section (abfd, s, &dynbuf)) |
| 7793 | goto error_return; |
| 7794 | |
| 7795 | elfsec = _bfd_elf_section_from_bfd_section (abfd, s); |
| 7796 | if (elfsec == SHN_BAD) |
| 7797 | goto error_return; |
| 7798 | |
| 7799 | shlink = elf_elfsections (abfd)[elfsec]->sh_link; |
| 7800 | |
| 7801 | extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn; |
| 7802 | swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in; |
| 7803 | |
| 7804 | extdyn = dynbuf; |
| 7805 | extdynend = extdyn + s->size; |
| 7806 | for (; extdyn < extdynend; extdyn += extdynsize) |
| 7807 | { |
| 7808 | Elf_Internal_Dyn dyn; |
| 7809 | |
| 7810 | (*swap_dyn_in) (abfd, extdyn, &dyn); |
| 7811 | |
| 7812 | if (dyn.d_tag == DT_NULL) |
| 7813 | break; |
| 7814 | |
| 7815 | if (dyn.d_tag == DT_NEEDED) |
| 7816 | { |
| 7817 | const char *string; |
| 7818 | struct bfd_link_needed_list *l; |
| 7819 | unsigned int tagv = dyn.d_un.d_val; |
| 7820 | bfd_size_type amt; |
| 7821 | |
| 7822 | string = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 7823 | if (string == NULL) |
| 7824 | goto error_return; |
| 7825 | |
| 7826 | amt = sizeof *l; |
| 7827 | l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt); |
| 7828 | if (l == NULL) |
| 7829 | goto error_return; |
| 7830 | |
| 7831 | l->by = abfd; |
| 7832 | l->name = string; |
| 7833 | l->next = *pneeded; |
| 7834 | *pneeded = l; |
| 7835 | } |
| 7836 | } |
| 7837 | |
| 7838 | free (dynbuf); |
| 7839 | |
| 7840 | return TRUE; |
| 7841 | |
| 7842 | error_return: |
| 7843 | if (dynbuf != NULL) |
| 7844 | free (dynbuf); |
| 7845 | return FALSE; |
| 7846 | } |
| 7847 | |
| 7848 | struct elf_symbuf_symbol |
| 7849 | { |
| 7850 | unsigned long st_name; /* Symbol name, index in string tbl */ |
| 7851 | unsigned char st_info; /* Type and binding attributes */ |
| 7852 | unsigned char st_other; /* Visibilty, and target specific */ |
| 7853 | }; |
| 7854 | |
| 7855 | struct elf_symbuf_head |
| 7856 | { |
| 7857 | struct elf_symbuf_symbol *ssym; |
| 7858 | size_t count; |
| 7859 | unsigned int st_shndx; |
| 7860 | }; |
| 7861 | |
| 7862 | struct elf_symbol |
| 7863 | { |
| 7864 | union |
| 7865 | { |
| 7866 | Elf_Internal_Sym *isym; |
| 7867 | struct elf_symbuf_symbol *ssym; |
| 7868 | } u; |
| 7869 | const char *name; |
| 7870 | }; |
| 7871 | |
| 7872 | /* Sort references to symbols by ascending section number. */ |
| 7873 | |
| 7874 | static int |
| 7875 | elf_sort_elf_symbol (const void *arg1, const void *arg2) |
| 7876 | { |
| 7877 | const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1; |
| 7878 | const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2; |
| 7879 | |
| 7880 | return s1->st_shndx - s2->st_shndx; |
| 7881 | } |
| 7882 | |
| 7883 | static int |
| 7884 | elf_sym_name_compare (const void *arg1, const void *arg2) |
| 7885 | { |
| 7886 | const struct elf_symbol *s1 = (const struct elf_symbol *) arg1; |
| 7887 | const struct elf_symbol *s2 = (const struct elf_symbol *) arg2; |
| 7888 | return strcmp (s1->name, s2->name); |
| 7889 | } |
| 7890 | |
| 7891 | static struct elf_symbuf_head * |
| 7892 | elf_create_symbuf (size_t symcount, Elf_Internal_Sym *isymbuf) |
| 7893 | { |
| 7894 | Elf_Internal_Sym **ind, **indbufend, **indbuf; |
| 7895 | struct elf_symbuf_symbol *ssym; |
| 7896 | struct elf_symbuf_head *ssymbuf, *ssymhead; |
| 7897 | size_t i, shndx_count, total_size; |
| 7898 | |
| 7899 | indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf)); |
| 7900 | if (indbuf == NULL) |
| 7901 | return NULL; |
| 7902 | |
| 7903 | for (ind = indbuf, i = 0; i < symcount; i++) |
| 7904 | if (isymbuf[i].st_shndx != SHN_UNDEF) |
| 7905 | *ind++ = &isymbuf[i]; |
| 7906 | indbufend = ind; |
| 7907 | |
| 7908 | qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *), |
| 7909 | elf_sort_elf_symbol); |
| 7910 | |
| 7911 | shndx_count = 0; |
| 7912 | if (indbufend > indbuf) |
| 7913 | for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++) |
| 7914 | if (ind[0]->st_shndx != ind[1]->st_shndx) |
| 7915 | shndx_count++; |
| 7916 | |
| 7917 | total_size = ((shndx_count + 1) * sizeof (*ssymbuf) |
| 7918 | + (indbufend - indbuf) * sizeof (*ssym)); |
| 7919 | ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size); |
| 7920 | if (ssymbuf == NULL) |
| 7921 | { |
| 7922 | free (indbuf); |
| 7923 | return NULL; |
| 7924 | } |
| 7925 | |
| 7926 | ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1); |
| 7927 | ssymbuf->ssym = NULL; |
| 7928 | ssymbuf->count = shndx_count; |
| 7929 | ssymbuf->st_shndx = 0; |
| 7930 | for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++) |
| 7931 | { |
| 7932 | if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx) |
| 7933 | { |
| 7934 | ssymhead++; |
| 7935 | ssymhead->ssym = ssym; |
| 7936 | ssymhead->count = 0; |
| 7937 | ssymhead->st_shndx = (*ind)->st_shndx; |
| 7938 | } |
| 7939 | ssym->st_name = (*ind)->st_name; |
| 7940 | ssym->st_info = (*ind)->st_info; |
| 7941 | ssym->st_other = (*ind)->st_other; |
| 7942 | ssymhead->count++; |
| 7943 | } |
| 7944 | BFD_ASSERT ((size_t) (ssymhead - ssymbuf) == shndx_count |
| 7945 | && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf) |
| 7946 | == total_size)); |
| 7947 | |
| 7948 | free (indbuf); |
| 7949 | return ssymbuf; |
| 7950 | } |
| 7951 | |
| 7952 | /* Check if 2 sections define the same set of local and global |
| 7953 | symbols. */ |
| 7954 | |
| 7955 | static bfd_boolean |
| 7956 | bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2, |
| 7957 | struct bfd_link_info *info) |
| 7958 | { |
| 7959 | bfd *bfd1, *bfd2; |
| 7960 | const struct elf_backend_data *bed1, *bed2; |
| 7961 | Elf_Internal_Shdr *hdr1, *hdr2; |
| 7962 | size_t symcount1, symcount2; |
| 7963 | Elf_Internal_Sym *isymbuf1, *isymbuf2; |
| 7964 | struct elf_symbuf_head *ssymbuf1, *ssymbuf2; |
| 7965 | Elf_Internal_Sym *isym, *isymend; |
| 7966 | struct elf_symbol *symtable1 = NULL, *symtable2 = NULL; |
| 7967 | size_t count1, count2, i; |
| 7968 | unsigned int shndx1, shndx2; |
| 7969 | bfd_boolean result; |
| 7970 | |
| 7971 | bfd1 = sec1->owner; |
| 7972 | bfd2 = sec2->owner; |
| 7973 | |
| 7974 | /* Both sections have to be in ELF. */ |
| 7975 | if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour |
| 7976 | || bfd_get_flavour (bfd2) != bfd_target_elf_flavour) |
| 7977 | return FALSE; |
| 7978 | |
| 7979 | if (elf_section_type (sec1) != elf_section_type (sec2)) |
| 7980 | return FALSE; |
| 7981 | |
| 7982 | shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1); |
| 7983 | shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2); |
| 7984 | if (shndx1 == SHN_BAD || shndx2 == SHN_BAD) |
| 7985 | return FALSE; |
| 7986 | |
| 7987 | bed1 = get_elf_backend_data (bfd1); |
| 7988 | bed2 = get_elf_backend_data (bfd2); |
| 7989 | hdr1 = &elf_tdata (bfd1)->symtab_hdr; |
| 7990 | symcount1 = hdr1->sh_size / bed1->s->sizeof_sym; |
| 7991 | hdr2 = &elf_tdata (bfd2)->symtab_hdr; |
| 7992 | symcount2 = hdr2->sh_size / bed2->s->sizeof_sym; |
| 7993 | |
| 7994 | if (symcount1 == 0 || symcount2 == 0) |
| 7995 | return FALSE; |
| 7996 | |
| 7997 | result = FALSE; |
| 7998 | isymbuf1 = NULL; |
| 7999 | isymbuf2 = NULL; |
| 8000 | ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf; |
| 8001 | ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf; |
| 8002 | |
| 8003 | if (ssymbuf1 == NULL) |
| 8004 | { |
| 8005 | isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0, |
| 8006 | NULL, NULL, NULL); |
| 8007 | if (isymbuf1 == NULL) |
| 8008 | goto done; |
| 8009 | |
| 8010 | if (!info->reduce_memory_overheads) |
| 8011 | elf_tdata (bfd1)->symbuf = ssymbuf1 |
| 8012 | = elf_create_symbuf (symcount1, isymbuf1); |
| 8013 | } |
| 8014 | |
| 8015 | if (ssymbuf1 == NULL || ssymbuf2 == NULL) |
| 8016 | { |
| 8017 | isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0, |
| 8018 | NULL, NULL, NULL); |
| 8019 | if (isymbuf2 == NULL) |
| 8020 | goto done; |
| 8021 | |
| 8022 | if (ssymbuf1 != NULL && !info->reduce_memory_overheads) |
| 8023 | elf_tdata (bfd2)->symbuf = ssymbuf2 |
| 8024 | = elf_create_symbuf (symcount2, isymbuf2); |
| 8025 | } |
| 8026 | |
| 8027 | if (ssymbuf1 != NULL && ssymbuf2 != NULL) |
| 8028 | { |
| 8029 | /* Optimized faster version. */ |
| 8030 | size_t lo, hi, mid; |
| 8031 | struct elf_symbol *symp; |
| 8032 | struct elf_symbuf_symbol *ssym, *ssymend; |
| 8033 | |
| 8034 | lo = 0; |
| 8035 | hi = ssymbuf1->count; |
| 8036 | ssymbuf1++; |
| 8037 | count1 = 0; |
| 8038 | while (lo < hi) |
| 8039 | { |
| 8040 | mid = (lo + hi) / 2; |
| 8041 | if (shndx1 < ssymbuf1[mid].st_shndx) |
| 8042 | hi = mid; |
| 8043 | else if (shndx1 > ssymbuf1[mid].st_shndx) |
| 8044 | lo = mid + 1; |
| 8045 | else |
| 8046 | { |
| 8047 | count1 = ssymbuf1[mid].count; |
| 8048 | ssymbuf1 += mid; |
| 8049 | break; |
| 8050 | } |
| 8051 | } |
| 8052 | |
| 8053 | lo = 0; |
| 8054 | hi = ssymbuf2->count; |
| 8055 | ssymbuf2++; |
| 8056 | count2 = 0; |
| 8057 | while (lo < hi) |
| 8058 | { |
| 8059 | mid = (lo + hi) / 2; |
| 8060 | if (shndx2 < ssymbuf2[mid].st_shndx) |
| 8061 | hi = mid; |
| 8062 | else if (shndx2 > ssymbuf2[mid].st_shndx) |
| 8063 | lo = mid + 1; |
| 8064 | else |
| 8065 | { |
| 8066 | count2 = ssymbuf2[mid].count; |
| 8067 | ssymbuf2 += mid; |
| 8068 | break; |
| 8069 | } |
| 8070 | } |
| 8071 | |
| 8072 | if (count1 == 0 || count2 == 0 || count1 != count2) |
| 8073 | goto done; |
| 8074 | |
| 8075 | symtable1 |
| 8076 | = (struct elf_symbol *) bfd_malloc (count1 * sizeof (*symtable1)); |
| 8077 | symtable2 |
| 8078 | = (struct elf_symbol *) bfd_malloc (count2 * sizeof (*symtable2)); |
| 8079 | if (symtable1 == NULL || symtable2 == NULL) |
| 8080 | goto done; |
| 8081 | |
| 8082 | symp = symtable1; |
| 8083 | for (ssym = ssymbuf1->ssym, ssymend = ssym + count1; |
| 8084 | ssym < ssymend; ssym++, symp++) |
| 8085 | { |
| 8086 | symp->u.ssym = ssym; |
| 8087 | symp->name = bfd_elf_string_from_elf_section (bfd1, |
| 8088 | hdr1->sh_link, |
| 8089 | ssym->st_name); |
| 8090 | } |
| 8091 | |
| 8092 | symp = symtable2; |
| 8093 | for (ssym = ssymbuf2->ssym, ssymend = ssym + count2; |
| 8094 | ssym < ssymend; ssym++, symp++) |
| 8095 | { |
| 8096 | symp->u.ssym = ssym; |
| 8097 | symp->name = bfd_elf_string_from_elf_section (bfd2, |
| 8098 | hdr2->sh_link, |
| 8099 | ssym->st_name); |
| 8100 | } |
| 8101 | |
| 8102 | /* Sort symbol by name. */ |
| 8103 | qsort (symtable1, count1, sizeof (struct elf_symbol), |
| 8104 | elf_sym_name_compare); |
| 8105 | qsort (symtable2, count1, sizeof (struct elf_symbol), |
| 8106 | elf_sym_name_compare); |
| 8107 | |
| 8108 | for (i = 0; i < count1; i++) |
| 8109 | /* Two symbols must have the same binding, type and name. */ |
| 8110 | if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info |
| 8111 | || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other |
| 8112 | || strcmp (symtable1 [i].name, symtable2 [i].name) != 0) |
| 8113 | goto done; |
| 8114 | |
| 8115 | result = TRUE; |
| 8116 | goto done; |
| 8117 | } |
| 8118 | |
| 8119 | symtable1 = (struct elf_symbol *) |
| 8120 | bfd_malloc (symcount1 * sizeof (struct elf_symbol)); |
| 8121 | symtable2 = (struct elf_symbol *) |
| 8122 | bfd_malloc (symcount2 * sizeof (struct elf_symbol)); |
| 8123 | if (symtable1 == NULL || symtable2 == NULL) |
| 8124 | goto done; |
| 8125 | |
| 8126 | /* Count definitions in the section. */ |
| 8127 | count1 = 0; |
| 8128 | for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++) |
| 8129 | if (isym->st_shndx == shndx1) |
| 8130 | symtable1[count1++].u.isym = isym; |
| 8131 | |
| 8132 | count2 = 0; |
| 8133 | for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++) |
| 8134 | if (isym->st_shndx == shndx2) |
| 8135 | symtable2[count2++].u.isym = isym; |
| 8136 | |
| 8137 | if (count1 == 0 || count2 == 0 || count1 != count2) |
| 8138 | goto done; |
| 8139 | |
| 8140 | for (i = 0; i < count1; i++) |
| 8141 | symtable1[i].name |
| 8142 | = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link, |
| 8143 | symtable1[i].u.isym->st_name); |
| 8144 | |
| 8145 | for (i = 0; i < count2; i++) |
| 8146 | symtable2[i].name |
| 8147 | = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link, |
| 8148 | symtable2[i].u.isym->st_name); |
| 8149 | |
| 8150 | /* Sort symbol by name. */ |
| 8151 | qsort (symtable1, count1, sizeof (struct elf_symbol), |
| 8152 | elf_sym_name_compare); |
| 8153 | qsort (symtable2, count1, sizeof (struct elf_symbol), |
| 8154 | elf_sym_name_compare); |
| 8155 | |
| 8156 | for (i = 0; i < count1; i++) |
| 8157 | /* Two symbols must have the same binding, type and name. */ |
| 8158 | if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info |
| 8159 | || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other |
| 8160 | || strcmp (symtable1 [i].name, symtable2 [i].name) != 0) |
| 8161 | goto done; |
| 8162 | |
| 8163 | result = TRUE; |
| 8164 | |
| 8165 | done: |
| 8166 | if (symtable1) |
| 8167 | free (symtable1); |
| 8168 | if (symtable2) |
| 8169 | free (symtable2); |
| 8170 | if (isymbuf1) |
| 8171 | free (isymbuf1); |
| 8172 | if (isymbuf2) |
| 8173 | free (isymbuf2); |
| 8174 | |
| 8175 | return result; |
| 8176 | } |
| 8177 | |
| 8178 | /* Return TRUE if 2 section types are compatible. */ |
| 8179 | |
| 8180 | bfd_boolean |
| 8181 | _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec, |
| 8182 | bfd *bbfd, const asection *bsec) |
| 8183 | { |
| 8184 | if (asec == NULL |
| 8185 | || bsec == NULL |
| 8186 | || abfd->xvec->flavour != bfd_target_elf_flavour |
| 8187 | || bbfd->xvec->flavour != bfd_target_elf_flavour) |
| 8188 | return TRUE; |
| 8189 | |
| 8190 | return elf_section_type (asec) == elf_section_type (bsec); |
| 8191 | } |
| 8192 | \f |
| 8193 | /* Final phase of ELF linker. */ |
| 8194 | |
| 8195 | /* A structure we use to avoid passing large numbers of arguments. */ |
| 8196 | |
| 8197 | struct elf_final_link_info |
| 8198 | { |
| 8199 | /* General link information. */ |
| 8200 | struct bfd_link_info *info; |
| 8201 | /* Output BFD. */ |
| 8202 | bfd *output_bfd; |
| 8203 | /* Symbol string table. */ |
| 8204 | struct elf_strtab_hash *symstrtab; |
| 8205 | /* .hash section. */ |
| 8206 | asection *hash_sec; |
| 8207 | /* symbol version section (.gnu.version). */ |
| 8208 | asection *symver_sec; |
| 8209 | /* Buffer large enough to hold contents of any section. */ |
| 8210 | bfd_byte *contents; |
| 8211 | /* Buffer large enough to hold external relocs of any section. */ |
| 8212 | void *external_relocs; |
| 8213 | /* Buffer large enough to hold internal relocs of any section. */ |
| 8214 | Elf_Internal_Rela *internal_relocs; |
| 8215 | /* Buffer large enough to hold external local symbols of any input |
| 8216 | BFD. */ |
| 8217 | bfd_byte *external_syms; |
| 8218 | /* And a buffer for symbol section indices. */ |
| 8219 | Elf_External_Sym_Shndx *locsym_shndx; |
| 8220 | /* Buffer large enough to hold internal local symbols of any input |
| 8221 | BFD. */ |
| 8222 | Elf_Internal_Sym *internal_syms; |
| 8223 | /* Array large enough to hold a symbol index for each local symbol |
| 8224 | of any input BFD. */ |
| 8225 | long *indices; |
| 8226 | /* Array large enough to hold a section pointer for each local |
| 8227 | symbol of any input BFD. */ |
| 8228 | asection **sections; |
| 8229 | /* Buffer for SHT_SYMTAB_SHNDX section. */ |
| 8230 | Elf_External_Sym_Shndx *symshndxbuf; |
| 8231 | /* Number of STT_FILE syms seen. */ |
| 8232 | size_t filesym_count; |
| 8233 | }; |
| 8234 | |
| 8235 | /* This struct is used to pass information to elf_link_output_extsym. */ |
| 8236 | |
| 8237 | struct elf_outext_info |
| 8238 | { |
| 8239 | bfd_boolean failed; |
| 8240 | bfd_boolean localsyms; |
| 8241 | bfd_boolean file_sym_done; |
| 8242 | struct elf_final_link_info *flinfo; |
| 8243 | }; |
| 8244 | |
| 8245 | |
| 8246 | /* Support for evaluating a complex relocation. |
| 8247 | |
| 8248 | Complex relocations are generalized, self-describing relocations. The |
| 8249 | implementation of them consists of two parts: complex symbols, and the |
| 8250 | relocations themselves. |
| 8251 | |
| 8252 | The relocations are use a reserved elf-wide relocation type code (R_RELC |
| 8253 | external / BFD_RELOC_RELC internal) and an encoding of relocation field |
| 8254 | information (start bit, end bit, word width, etc) into the addend. This |
| 8255 | information is extracted from CGEN-generated operand tables within gas. |
| 8256 | |
| 8257 | Complex symbols are mangled symbols (BSF_RELC external / STT_RELC |
| 8258 | internal) representing prefix-notation expressions, including but not |
| 8259 | limited to those sorts of expressions normally encoded as addends in the |
| 8260 | addend field. The symbol mangling format is: |
| 8261 | |
| 8262 | <node> := <literal> |
| 8263 | | <unary-operator> ':' <node> |
| 8264 | | <binary-operator> ':' <node> ':' <node> |
| 8265 | ; |
| 8266 | |
| 8267 | <literal> := 's' <digits=N> ':' <N character symbol name> |
| 8268 | | 'S' <digits=N> ':' <N character section name> |
| 8269 | | '#' <hexdigits> |
| 8270 | ; |
| 8271 | |
| 8272 | <binary-operator> := as in C |
| 8273 | <unary-operator> := as in C, plus "0-" for unambiguous negation. */ |
| 8274 | |
| 8275 | static void |
| 8276 | set_symbol_value (bfd *bfd_with_globals, |
| 8277 | Elf_Internal_Sym *isymbuf, |
| 8278 | size_t locsymcount, |
| 8279 | size_t symidx, |
| 8280 | bfd_vma val) |
| 8281 | { |
| 8282 | struct elf_link_hash_entry **sym_hashes; |
| 8283 | struct elf_link_hash_entry *h; |
| 8284 | size_t extsymoff = locsymcount; |
| 8285 | |
| 8286 | if (symidx < locsymcount) |
| 8287 | { |
| 8288 | Elf_Internal_Sym *sym; |
| 8289 | |
| 8290 | sym = isymbuf + symidx; |
| 8291 | if (ELF_ST_BIND (sym->st_info) == STB_LOCAL) |
| 8292 | { |
| 8293 | /* It is a local symbol: move it to the |
| 8294 | "absolute" section and give it a value. */ |
| 8295 | sym->st_shndx = SHN_ABS; |
| 8296 | sym->st_value = val; |
| 8297 | return; |
| 8298 | } |
| 8299 | BFD_ASSERT (elf_bad_symtab (bfd_with_globals)); |
| 8300 | extsymoff = 0; |
| 8301 | } |
| 8302 | |
| 8303 | /* It is a global symbol: set its link type |
| 8304 | to "defined" and give it a value. */ |
| 8305 | |
| 8306 | sym_hashes = elf_sym_hashes (bfd_with_globals); |
| 8307 | h = sym_hashes [symidx - extsymoff]; |
| 8308 | while (h->root.type == bfd_link_hash_indirect |
| 8309 | || h->root.type == bfd_link_hash_warning) |
| 8310 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 8311 | h->root.type = bfd_link_hash_defined; |
| 8312 | h->root.u.def.value = val; |
| 8313 | h->root.u.def.section = bfd_abs_section_ptr; |
| 8314 | } |
| 8315 | |
| 8316 | static bfd_boolean |
| 8317 | resolve_symbol (const char *name, |
| 8318 | bfd *input_bfd, |
| 8319 | struct elf_final_link_info *flinfo, |
| 8320 | bfd_vma *result, |
| 8321 | Elf_Internal_Sym *isymbuf, |
| 8322 | size_t locsymcount) |
| 8323 | { |
| 8324 | Elf_Internal_Sym *sym; |
| 8325 | struct bfd_link_hash_entry *global_entry; |
| 8326 | const char *candidate = NULL; |
| 8327 | Elf_Internal_Shdr *symtab_hdr; |
| 8328 | size_t i; |
| 8329 | |
| 8330 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 8331 | |
| 8332 | for (i = 0; i < locsymcount; ++ i) |
| 8333 | { |
| 8334 | sym = isymbuf + i; |
| 8335 | |
| 8336 | if (ELF_ST_BIND (sym->st_info) != STB_LOCAL) |
| 8337 | continue; |
| 8338 | |
| 8339 | candidate = bfd_elf_string_from_elf_section (input_bfd, |
| 8340 | symtab_hdr->sh_link, |
| 8341 | sym->st_name); |
| 8342 | #ifdef DEBUG |
| 8343 | printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n", |
| 8344 | name, candidate, (unsigned long) sym->st_value); |
| 8345 | #endif |
| 8346 | if (candidate && strcmp (candidate, name) == 0) |
| 8347 | { |
| 8348 | asection *sec = flinfo->sections [i]; |
| 8349 | |
| 8350 | *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0); |
| 8351 | *result += sec->output_offset + sec->output_section->vma; |
| 8352 | #ifdef DEBUG |
| 8353 | printf ("Found symbol with value %8.8lx\n", |
| 8354 | (unsigned long) *result); |
| 8355 | #endif |
| 8356 | return TRUE; |
| 8357 | } |
| 8358 | } |
| 8359 | |
| 8360 | /* Hmm, haven't found it yet. perhaps it is a global. */ |
| 8361 | global_entry = bfd_link_hash_lookup (flinfo->info->hash, name, |
| 8362 | FALSE, FALSE, TRUE); |
| 8363 | if (!global_entry) |
| 8364 | return FALSE; |
| 8365 | |
| 8366 | if (global_entry->type == bfd_link_hash_defined |
| 8367 | || global_entry->type == bfd_link_hash_defweak) |
| 8368 | { |
| 8369 | *result = (global_entry->u.def.value |
| 8370 | + global_entry->u.def.section->output_section->vma |
| 8371 | + global_entry->u.def.section->output_offset); |
| 8372 | #ifdef DEBUG |
| 8373 | printf ("Found GLOBAL symbol '%s' with value %8.8lx\n", |
| 8374 | global_entry->root.string, (unsigned long) *result); |
| 8375 | #endif |
| 8376 | return TRUE; |
| 8377 | } |
| 8378 | |
| 8379 | return FALSE; |
| 8380 | } |
| 8381 | |
| 8382 | /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in |
| 8383 | bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section |
| 8384 | names like "foo.end" which is the end address of section "foo". */ |
| 8385 | |
| 8386 | static bfd_boolean |
| 8387 | resolve_section (const char *name, |
| 8388 | asection *sections, |
| 8389 | bfd_vma *result, |
| 8390 | bfd * abfd) |
| 8391 | { |
| 8392 | asection *curr; |
| 8393 | unsigned int len; |
| 8394 | |
| 8395 | for (curr = sections; curr; curr = curr->next) |
| 8396 | if (strcmp (curr->name, name) == 0) |
| 8397 | { |
| 8398 | *result = curr->vma; |
| 8399 | return TRUE; |
| 8400 | } |
| 8401 | |
| 8402 | /* Hmm. still haven't found it. try pseudo-section names. */ |
| 8403 | /* FIXME: This could be coded more efficiently... */ |
| 8404 | for (curr = sections; curr; curr = curr->next) |
| 8405 | { |
| 8406 | len = strlen (curr->name); |
| 8407 | if (len > strlen (name)) |
| 8408 | continue; |
| 8409 | |
| 8410 | if (strncmp (curr->name, name, len) == 0) |
| 8411 | { |
| 8412 | if (strncmp (".end", name + len, 4) == 0) |
| 8413 | { |
| 8414 | *result = curr->vma + curr->size / bfd_octets_per_byte (abfd); |
| 8415 | return TRUE; |
| 8416 | } |
| 8417 | |
| 8418 | /* Insert more pseudo-section names here, if you like. */ |
| 8419 | } |
| 8420 | } |
| 8421 | |
| 8422 | return FALSE; |
| 8423 | } |
| 8424 | |
| 8425 | static void |
| 8426 | undefined_reference (const char *reftype, const char *name) |
| 8427 | { |
| 8428 | /* xgettext:c-format */ |
| 8429 | _bfd_error_handler (_("undefined %s reference in complex symbol: %s"), |
| 8430 | reftype, name); |
| 8431 | } |
| 8432 | |
| 8433 | static bfd_boolean |
| 8434 | eval_symbol (bfd_vma *result, |
| 8435 | const char **symp, |
| 8436 | bfd *input_bfd, |
| 8437 | struct elf_final_link_info *flinfo, |
| 8438 | bfd_vma dot, |
| 8439 | Elf_Internal_Sym *isymbuf, |
| 8440 | size_t locsymcount, |
| 8441 | int signed_p) |
| 8442 | { |
| 8443 | size_t len; |
| 8444 | size_t symlen; |
| 8445 | bfd_vma a; |
| 8446 | bfd_vma b; |
| 8447 | char symbuf[4096]; |
| 8448 | const char *sym = *symp; |
| 8449 | const char *symend; |
| 8450 | bfd_boolean symbol_is_section = FALSE; |
| 8451 | |
| 8452 | len = strlen (sym); |
| 8453 | symend = sym + len; |
| 8454 | |
| 8455 | if (len < 1 || len > sizeof (symbuf)) |
| 8456 | { |
| 8457 | bfd_set_error (bfd_error_invalid_operation); |
| 8458 | return FALSE; |
| 8459 | } |
| 8460 | |
| 8461 | switch (* sym) |
| 8462 | { |
| 8463 | case '.': |
| 8464 | *result = dot; |
| 8465 | *symp = sym + 1; |
| 8466 | return TRUE; |
| 8467 | |
| 8468 | case '#': |
| 8469 | ++sym; |
| 8470 | *result = strtoul (sym, (char **) symp, 16); |
| 8471 | return TRUE; |
| 8472 | |
| 8473 | case 'S': |
| 8474 | symbol_is_section = TRUE; |
| 8475 | /* Fall through. */ |
| 8476 | case 's': |
| 8477 | ++sym; |
| 8478 | symlen = strtol (sym, (char **) symp, 10); |
| 8479 | sym = *symp + 1; /* Skip the trailing ':'. */ |
| 8480 | |
| 8481 | if (symend < sym || symlen + 1 > sizeof (symbuf)) |
| 8482 | { |
| 8483 | bfd_set_error (bfd_error_invalid_operation); |
| 8484 | return FALSE; |
| 8485 | } |
| 8486 | |
| 8487 | memcpy (symbuf, sym, symlen); |
| 8488 | symbuf[symlen] = '\0'; |
| 8489 | *symp = sym + symlen; |
| 8490 | |
| 8491 | /* Is it always possible, with complex symbols, that gas "mis-guessed" |
| 8492 | the symbol as a section, or vice-versa. so we're pretty liberal in our |
| 8493 | interpretation here; section means "try section first", not "must be a |
| 8494 | section", and likewise with symbol. */ |
| 8495 | |
| 8496 | if (symbol_is_section) |
| 8497 | { |
| 8498 | if (!resolve_section (symbuf, flinfo->output_bfd->sections, result, input_bfd) |
| 8499 | && !resolve_symbol (symbuf, input_bfd, flinfo, result, |
| 8500 | isymbuf, locsymcount)) |
| 8501 | { |
| 8502 | undefined_reference ("section", symbuf); |
| 8503 | return FALSE; |
| 8504 | } |
| 8505 | } |
| 8506 | else |
| 8507 | { |
| 8508 | if (!resolve_symbol (symbuf, input_bfd, flinfo, result, |
| 8509 | isymbuf, locsymcount) |
| 8510 | && !resolve_section (symbuf, flinfo->output_bfd->sections, |
| 8511 | result, input_bfd)) |
| 8512 | { |
| 8513 | undefined_reference ("symbol", symbuf); |
| 8514 | return FALSE; |
| 8515 | } |
| 8516 | } |
| 8517 | |
| 8518 | return TRUE; |
| 8519 | |
| 8520 | /* All that remains are operators. */ |
| 8521 | |
| 8522 | #define UNARY_OP(op) \ |
| 8523 | if (strncmp (sym, #op, strlen (#op)) == 0) \ |
| 8524 | { \ |
| 8525 | sym += strlen (#op); \ |
| 8526 | if (*sym == ':') \ |
| 8527 | ++sym; \ |
| 8528 | *symp = sym; \ |
| 8529 | if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \ |
| 8530 | isymbuf, locsymcount, signed_p)) \ |
| 8531 | return FALSE; \ |
| 8532 | if (signed_p) \ |
| 8533 | *result = op ((bfd_signed_vma) a); \ |
| 8534 | else \ |
| 8535 | *result = op a; \ |
| 8536 | return TRUE; \ |
| 8537 | } |
| 8538 | |
| 8539 | #define BINARY_OP(op) \ |
| 8540 | if (strncmp (sym, #op, strlen (#op)) == 0) \ |
| 8541 | { \ |
| 8542 | sym += strlen (#op); \ |
| 8543 | if (*sym == ':') \ |
| 8544 | ++sym; \ |
| 8545 | *symp = sym; \ |
| 8546 | if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \ |
| 8547 | isymbuf, locsymcount, signed_p)) \ |
| 8548 | return FALSE; \ |
| 8549 | ++*symp; \ |
| 8550 | if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \ |
| 8551 | isymbuf, locsymcount, signed_p)) \ |
| 8552 | return FALSE; \ |
| 8553 | if (signed_p) \ |
| 8554 | *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \ |
| 8555 | else \ |
| 8556 | *result = a op b; \ |
| 8557 | return TRUE; \ |
| 8558 | } |
| 8559 | |
| 8560 | default: |
| 8561 | UNARY_OP (0-); |
| 8562 | BINARY_OP (<<); |
| 8563 | BINARY_OP (>>); |
| 8564 | BINARY_OP (==); |
| 8565 | BINARY_OP (!=); |
| 8566 | BINARY_OP (<=); |
| 8567 | BINARY_OP (>=); |
| 8568 | BINARY_OP (&&); |
| 8569 | BINARY_OP (||); |
| 8570 | UNARY_OP (~); |
| 8571 | UNARY_OP (!); |
| 8572 | BINARY_OP (*); |
| 8573 | BINARY_OP (/); |
| 8574 | BINARY_OP (%); |
| 8575 | BINARY_OP (^); |
| 8576 | BINARY_OP (|); |
| 8577 | BINARY_OP (&); |
| 8578 | BINARY_OP (+); |
| 8579 | BINARY_OP (-); |
| 8580 | BINARY_OP (<); |
| 8581 | BINARY_OP (>); |
| 8582 | #undef UNARY_OP |
| 8583 | #undef BINARY_OP |
| 8584 | _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym); |
| 8585 | bfd_set_error (bfd_error_invalid_operation); |
| 8586 | return FALSE; |
| 8587 | } |
| 8588 | } |
| 8589 | |
| 8590 | static void |
| 8591 | put_value (bfd_vma size, |
| 8592 | unsigned long chunksz, |
| 8593 | bfd *input_bfd, |
| 8594 | bfd_vma x, |
| 8595 | bfd_byte *location) |
| 8596 | { |
| 8597 | location += (size - chunksz); |
| 8598 | |
| 8599 | for (; size; size -= chunksz, location -= chunksz) |
| 8600 | { |
| 8601 | switch (chunksz) |
| 8602 | { |
| 8603 | case 1: |
| 8604 | bfd_put_8 (input_bfd, x, location); |
| 8605 | x >>= 8; |
| 8606 | break; |
| 8607 | case 2: |
| 8608 | bfd_put_16 (input_bfd, x, location); |
| 8609 | x >>= 16; |
| 8610 | break; |
| 8611 | case 4: |
| 8612 | bfd_put_32 (input_bfd, x, location); |
| 8613 | /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */ |
| 8614 | x >>= 16; |
| 8615 | x >>= 16; |
| 8616 | break; |
| 8617 | #ifdef BFD64 |
| 8618 | case 8: |
| 8619 | bfd_put_64 (input_bfd, x, location); |
| 8620 | /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */ |
| 8621 | x >>= 32; |
| 8622 | x >>= 32; |
| 8623 | break; |
| 8624 | #endif |
| 8625 | default: |
| 8626 | abort (); |
| 8627 | break; |
| 8628 | } |
| 8629 | } |
| 8630 | } |
| 8631 | |
| 8632 | static bfd_vma |
| 8633 | get_value (bfd_vma size, |
| 8634 | unsigned long chunksz, |
| 8635 | bfd *input_bfd, |
| 8636 | bfd_byte *location) |
| 8637 | { |
| 8638 | int shift; |
| 8639 | bfd_vma x = 0; |
| 8640 | |
| 8641 | /* Sanity checks. */ |
| 8642 | BFD_ASSERT (chunksz <= sizeof (x) |
| 8643 | && size >= chunksz |
| 8644 | && chunksz != 0 |
| 8645 | && (size % chunksz) == 0 |
| 8646 | && input_bfd != NULL |
| 8647 | && location != NULL); |
| 8648 | |
| 8649 | if (chunksz == sizeof (x)) |
| 8650 | { |
| 8651 | BFD_ASSERT (size == chunksz); |
| 8652 | |
| 8653 | /* Make sure that we do not perform an undefined shift operation. |
| 8654 | We know that size == chunksz so there will only be one iteration |
| 8655 | of the loop below. */ |
| 8656 | shift = 0; |
| 8657 | } |
| 8658 | else |
| 8659 | shift = 8 * chunksz; |
| 8660 | |
| 8661 | for (; size; size -= chunksz, location += chunksz) |
| 8662 | { |
| 8663 | switch (chunksz) |
| 8664 | { |
| 8665 | case 1: |
| 8666 | x = (x << shift) | bfd_get_8 (input_bfd, location); |
| 8667 | break; |
| 8668 | case 2: |
| 8669 | x = (x << shift) | bfd_get_16 (input_bfd, location); |
| 8670 | break; |
| 8671 | case 4: |
| 8672 | x = (x << shift) | bfd_get_32 (input_bfd, location); |
| 8673 | break; |
| 8674 | #ifdef BFD64 |
| 8675 | case 8: |
| 8676 | x = (x << shift) | bfd_get_64 (input_bfd, location); |
| 8677 | break; |
| 8678 | #endif |
| 8679 | default: |
| 8680 | abort (); |
| 8681 | } |
| 8682 | } |
| 8683 | return x; |
| 8684 | } |
| 8685 | |
| 8686 | static void |
| 8687 | decode_complex_addend (unsigned long *start, /* in bits */ |
| 8688 | unsigned long *oplen, /* in bits */ |
| 8689 | unsigned long *len, /* in bits */ |
| 8690 | unsigned long *wordsz, /* in bytes */ |
| 8691 | unsigned long *chunksz, /* in bytes */ |
| 8692 | unsigned long *lsb0_p, |
| 8693 | unsigned long *signed_p, |
| 8694 | unsigned long *trunc_p, |
| 8695 | unsigned long encoded) |
| 8696 | { |
| 8697 | * start = encoded & 0x3F; |
| 8698 | * len = (encoded >> 6) & 0x3F; |
| 8699 | * oplen = (encoded >> 12) & 0x3F; |
| 8700 | * wordsz = (encoded >> 18) & 0xF; |
| 8701 | * chunksz = (encoded >> 22) & 0xF; |
| 8702 | * lsb0_p = (encoded >> 27) & 1; |
| 8703 | * signed_p = (encoded >> 28) & 1; |
| 8704 | * trunc_p = (encoded >> 29) & 1; |
| 8705 | } |
| 8706 | |
| 8707 | bfd_reloc_status_type |
| 8708 | bfd_elf_perform_complex_relocation (bfd *input_bfd, |
| 8709 | asection *input_section ATTRIBUTE_UNUSED, |
| 8710 | bfd_byte *contents, |
| 8711 | Elf_Internal_Rela *rel, |
| 8712 | bfd_vma relocation) |
| 8713 | { |
| 8714 | bfd_vma shift, x, mask; |
| 8715 | unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p; |
| 8716 | bfd_reloc_status_type r; |
| 8717 | |
| 8718 | /* Perform this reloc, since it is complex. |
| 8719 | (this is not to say that it necessarily refers to a complex |
| 8720 | symbol; merely that it is a self-describing CGEN based reloc. |
| 8721 | i.e. the addend has the complete reloc information (bit start, end, |
| 8722 | word size, etc) encoded within it.). */ |
| 8723 | |
| 8724 | decode_complex_addend (&start, &oplen, &len, &wordsz, |
| 8725 | &chunksz, &lsb0_p, &signed_p, |
| 8726 | &trunc_p, rel->r_addend); |
| 8727 | |
| 8728 | mask = (((1L << (len - 1)) - 1) << 1) | 1; |
| 8729 | |
| 8730 | if (lsb0_p) |
| 8731 | shift = (start + 1) - len; |
| 8732 | else |
| 8733 | shift = (8 * wordsz) - (start + len); |
| 8734 | |
| 8735 | x = get_value (wordsz, chunksz, input_bfd, |
| 8736 | contents + rel->r_offset * bfd_octets_per_byte (input_bfd)); |
| 8737 | |
| 8738 | #ifdef DEBUG |
| 8739 | printf ("Doing complex reloc: " |
| 8740 | "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, " |
| 8741 | "chunksz %ld, start %ld, len %ld, oplen %ld\n" |
| 8742 | " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n", |
| 8743 | lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len, |
| 8744 | oplen, (unsigned long) x, (unsigned long) mask, |
| 8745 | (unsigned long) relocation); |
| 8746 | #endif |
| 8747 | |
| 8748 | r = bfd_reloc_ok; |
| 8749 | if (! trunc_p) |
| 8750 | /* Now do an overflow check. */ |
| 8751 | r = bfd_check_overflow ((signed_p |
| 8752 | ? complain_overflow_signed |
| 8753 | : complain_overflow_unsigned), |
| 8754 | len, 0, (8 * wordsz), |
| 8755 | relocation); |
| 8756 | |
| 8757 | /* Do the deed. */ |
| 8758 | x = (x & ~(mask << shift)) | ((relocation & mask) << shift); |
| 8759 | |
| 8760 | #ifdef DEBUG |
| 8761 | printf (" relocation: %8.8lx\n" |
| 8762 | " shifted mask: %8.8lx\n" |
| 8763 | " shifted/masked reloc: %8.8lx\n" |
| 8764 | " result: %8.8lx\n", |
| 8765 | (unsigned long) relocation, (unsigned long) (mask << shift), |
| 8766 | (unsigned long) ((relocation & mask) << shift), (unsigned long) x); |
| 8767 | #endif |
| 8768 | put_value (wordsz, chunksz, input_bfd, x, |
| 8769 | contents + rel->r_offset * bfd_octets_per_byte (input_bfd)); |
| 8770 | return r; |
| 8771 | } |
| 8772 | |
| 8773 | /* Functions to read r_offset from external (target order) reloc |
| 8774 | entry. Faster than bfd_getl32 et al, because we let the compiler |
| 8775 | know the value is aligned. */ |
| 8776 | |
| 8777 | static bfd_vma |
| 8778 | ext32l_r_offset (const void *p) |
| 8779 | { |
| 8780 | union aligned32 |
| 8781 | { |
| 8782 | uint32_t v; |
| 8783 | unsigned char c[4]; |
| 8784 | }; |
| 8785 | const union aligned32 *a |
| 8786 | = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset; |
| 8787 | |
| 8788 | uint32_t aval = ( (uint32_t) a->c[0] |
| 8789 | | (uint32_t) a->c[1] << 8 |
| 8790 | | (uint32_t) a->c[2] << 16 |
| 8791 | | (uint32_t) a->c[3] << 24); |
| 8792 | return aval; |
| 8793 | } |
| 8794 | |
| 8795 | static bfd_vma |
| 8796 | ext32b_r_offset (const void *p) |
| 8797 | { |
| 8798 | union aligned32 |
| 8799 | { |
| 8800 | uint32_t v; |
| 8801 | unsigned char c[4]; |
| 8802 | }; |
| 8803 | const union aligned32 *a |
| 8804 | = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset; |
| 8805 | |
| 8806 | uint32_t aval = ( (uint32_t) a->c[0] << 24 |
| 8807 | | (uint32_t) a->c[1] << 16 |
| 8808 | | (uint32_t) a->c[2] << 8 |
| 8809 | | (uint32_t) a->c[3]); |
| 8810 | return aval; |
| 8811 | } |
| 8812 | |
| 8813 | #ifdef BFD_HOST_64_BIT |
| 8814 | static bfd_vma |
| 8815 | ext64l_r_offset (const void *p) |
| 8816 | { |
| 8817 | union aligned64 |
| 8818 | { |
| 8819 | uint64_t v; |
| 8820 | unsigned char c[8]; |
| 8821 | }; |
| 8822 | const union aligned64 *a |
| 8823 | = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset; |
| 8824 | |
| 8825 | uint64_t aval = ( (uint64_t) a->c[0] |
| 8826 | | (uint64_t) a->c[1] << 8 |
| 8827 | | (uint64_t) a->c[2] << 16 |
| 8828 | | (uint64_t) a->c[3] << 24 |
| 8829 | | (uint64_t) a->c[4] << 32 |
| 8830 | | (uint64_t) a->c[5] << 40 |
| 8831 | | (uint64_t) a->c[6] << 48 |
| 8832 | | (uint64_t) a->c[7] << 56); |
| 8833 | return aval; |
| 8834 | } |
| 8835 | |
| 8836 | static bfd_vma |
| 8837 | ext64b_r_offset (const void *p) |
| 8838 | { |
| 8839 | union aligned64 |
| 8840 | { |
| 8841 | uint64_t v; |
| 8842 | unsigned char c[8]; |
| 8843 | }; |
| 8844 | const union aligned64 *a |
| 8845 | = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset; |
| 8846 | |
| 8847 | uint64_t aval = ( (uint64_t) a->c[0] << 56 |
| 8848 | | (uint64_t) a->c[1] << 48 |
| 8849 | | (uint64_t) a->c[2] << 40 |
| 8850 | | (uint64_t) a->c[3] << 32 |
| 8851 | | (uint64_t) a->c[4] << 24 |
| 8852 | | (uint64_t) a->c[5] << 16 |
| 8853 | | (uint64_t) a->c[6] << 8 |
| 8854 | | (uint64_t) a->c[7]); |
| 8855 | return aval; |
| 8856 | } |
| 8857 | #endif |
| 8858 | |
| 8859 | /* When performing a relocatable link, the input relocations are |
| 8860 | preserved. But, if they reference global symbols, the indices |
| 8861 | referenced must be updated. Update all the relocations found in |
| 8862 | RELDATA. */ |
| 8863 | |
| 8864 | static bfd_boolean |
| 8865 | elf_link_adjust_relocs (bfd *abfd, |
| 8866 | asection *sec, |
| 8867 | struct bfd_elf_section_reloc_data *reldata, |
| 8868 | bfd_boolean sort, |
| 8869 | struct bfd_link_info *info) |
| 8870 | { |
| 8871 | unsigned int i; |
| 8872 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 8873 | bfd_byte *erela; |
| 8874 | void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *); |
| 8875 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
| 8876 | bfd_vma r_type_mask; |
| 8877 | int r_sym_shift; |
| 8878 | unsigned int count = reldata->count; |
| 8879 | struct elf_link_hash_entry **rel_hash = reldata->hashes; |
| 8880 | |
| 8881 | if (reldata->hdr->sh_entsize == bed->s->sizeof_rel) |
| 8882 | { |
| 8883 | swap_in = bed->s->swap_reloc_in; |
| 8884 | swap_out = bed->s->swap_reloc_out; |
| 8885 | } |
| 8886 | else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela) |
| 8887 | { |
| 8888 | swap_in = bed->s->swap_reloca_in; |
| 8889 | swap_out = bed->s->swap_reloca_out; |
| 8890 | } |
| 8891 | else |
| 8892 | abort (); |
| 8893 | |
| 8894 | if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL) |
| 8895 | abort (); |
| 8896 | |
| 8897 | if (bed->s->arch_size == 32) |
| 8898 | { |
| 8899 | r_type_mask = 0xff; |
| 8900 | r_sym_shift = 8; |
| 8901 | } |
| 8902 | else |
| 8903 | { |
| 8904 | r_type_mask = 0xffffffff; |
| 8905 | r_sym_shift = 32; |
| 8906 | } |
| 8907 | |
| 8908 | erela = reldata->hdr->contents; |
| 8909 | for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize) |
| 8910 | { |
| 8911 | Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL]; |
| 8912 | unsigned int j; |
| 8913 | |
| 8914 | if (*rel_hash == NULL) |
| 8915 | continue; |
| 8916 | |
| 8917 | if ((*rel_hash)->indx == -2 |
| 8918 | && info->gc_sections |
| 8919 | && ! info->gc_keep_exported) |
| 8920 | { |
| 8921 | /* PR 21524: Let the user know if a symbol was removed by garbage collection. */ |
| 8922 | _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"), |
| 8923 | abfd, sec, |
| 8924 | (*rel_hash)->root.root.string); |
| 8925 | _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"), |
| 8926 | abfd, sec); |
| 8927 | bfd_set_error (bfd_error_invalid_operation); |
| 8928 | return FALSE; |
| 8929 | } |
| 8930 | BFD_ASSERT ((*rel_hash)->indx >= 0); |
| 8931 | |
| 8932 | (*swap_in) (abfd, erela, irela); |
| 8933 | for (j = 0; j < bed->s->int_rels_per_ext_rel; j++) |
| 8934 | irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift |
| 8935 | | (irela[j].r_info & r_type_mask)); |
| 8936 | (*swap_out) (abfd, irela, erela); |
| 8937 | } |
| 8938 | |
| 8939 | if (bed->elf_backend_update_relocs) |
| 8940 | (*bed->elf_backend_update_relocs) (sec, reldata); |
| 8941 | |
| 8942 | if (sort && count != 0) |
| 8943 | { |
| 8944 | bfd_vma (*ext_r_off) (const void *); |
| 8945 | bfd_vma r_off; |
| 8946 | size_t elt_size; |
| 8947 | bfd_byte *base, *end, *p, *loc; |
| 8948 | bfd_byte *buf = NULL; |
| 8949 | |
| 8950 | if (bed->s->arch_size == 32) |
| 8951 | { |
| 8952 | if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE) |
| 8953 | ext_r_off = ext32l_r_offset; |
| 8954 | else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG) |
| 8955 | ext_r_off = ext32b_r_offset; |
| 8956 | else |
| 8957 | abort (); |
| 8958 | } |
| 8959 | else |
| 8960 | { |
| 8961 | #ifdef BFD_HOST_64_BIT |
| 8962 | if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE) |
| 8963 | ext_r_off = ext64l_r_offset; |
| 8964 | else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG) |
| 8965 | ext_r_off = ext64b_r_offset; |
| 8966 | else |
| 8967 | #endif |
| 8968 | abort (); |
| 8969 | } |
| 8970 | |
| 8971 | /* Must use a stable sort here. A modified insertion sort, |
| 8972 | since the relocs are mostly sorted already. */ |
| 8973 | elt_size = reldata->hdr->sh_entsize; |
| 8974 | base = reldata->hdr->contents; |
| 8975 | end = base + count * elt_size; |
| 8976 | if (elt_size > sizeof (Elf64_External_Rela)) |
| 8977 | abort (); |
| 8978 | |
| 8979 | /* Ensure the first element is lowest. This acts as a sentinel, |
| 8980 | speeding the main loop below. */ |
| 8981 | r_off = (*ext_r_off) (base); |
| 8982 | for (p = loc = base; (p += elt_size) < end; ) |
| 8983 | { |
| 8984 | bfd_vma r_off2 = (*ext_r_off) (p); |
| 8985 | if (r_off > r_off2) |
| 8986 | { |
| 8987 | r_off = r_off2; |
| 8988 | loc = p; |
| 8989 | } |
| 8990 | } |
| 8991 | if (loc != base) |
| 8992 | { |
| 8993 | /* Don't just swap *base and *loc as that changes the order |
| 8994 | of the original base[0] and base[1] if they happen to |
| 8995 | have the same r_offset. */ |
| 8996 | bfd_byte onebuf[sizeof (Elf64_External_Rela)]; |
| 8997 | memcpy (onebuf, loc, elt_size); |
| 8998 | memmove (base + elt_size, base, loc - base); |
| 8999 | memcpy (base, onebuf, elt_size); |
| 9000 | } |
| 9001 | |
| 9002 | for (p = base + elt_size; (p += elt_size) < end; ) |
| 9003 | { |
| 9004 | /* base to p is sorted, *p is next to insert. */ |
| 9005 | r_off = (*ext_r_off) (p); |
| 9006 | /* Search the sorted region for location to insert. */ |
| 9007 | loc = p - elt_size; |
| 9008 | while (r_off < (*ext_r_off) (loc)) |
| 9009 | loc -= elt_size; |
| 9010 | loc += elt_size; |
| 9011 | if (loc != p) |
| 9012 | { |
| 9013 | /* Chances are there is a run of relocs to insert here, |
| 9014 | from one of more input files. Files are not always |
| 9015 | linked in order due to the way elf_link_input_bfd is |
| 9016 | called. See pr17666. */ |
| 9017 | size_t sortlen = p - loc; |
| 9018 | bfd_vma r_off2 = (*ext_r_off) (loc); |
| 9019 | size_t runlen = elt_size; |
| 9020 | size_t buf_size = 96 * 1024; |
| 9021 | while (p + runlen < end |
| 9022 | && (sortlen <= buf_size |
| 9023 | || runlen + elt_size <= buf_size) |
| 9024 | && r_off2 > (*ext_r_off) (p + runlen)) |
| 9025 | runlen += elt_size; |
| 9026 | if (buf == NULL) |
| 9027 | { |
| 9028 | buf = bfd_malloc (buf_size); |
| 9029 | if (buf == NULL) |
| 9030 | return FALSE; |
| 9031 | } |
| 9032 | if (runlen < sortlen) |
| 9033 | { |
| 9034 | memcpy (buf, p, runlen); |
| 9035 | memmove (loc + runlen, loc, sortlen); |
| 9036 | memcpy (loc, buf, runlen); |
| 9037 | } |
| 9038 | else |
| 9039 | { |
| 9040 | memcpy (buf, loc, sortlen); |
| 9041 | memmove (loc, p, runlen); |
| 9042 | memcpy (loc + runlen, buf, sortlen); |
| 9043 | } |
| 9044 | p += runlen - elt_size; |
| 9045 | } |
| 9046 | } |
| 9047 | /* Hashes are no longer valid. */ |
| 9048 | free (reldata->hashes); |
| 9049 | reldata->hashes = NULL; |
| 9050 | free (buf); |
| 9051 | } |
| 9052 | return TRUE; |
| 9053 | } |
| 9054 | |
| 9055 | struct elf_link_sort_rela |
| 9056 | { |
| 9057 | union { |
| 9058 | bfd_vma offset; |
| 9059 | bfd_vma sym_mask; |
| 9060 | } u; |
| 9061 | enum elf_reloc_type_class type; |
| 9062 | /* We use this as an array of size int_rels_per_ext_rel. */ |
| 9063 | Elf_Internal_Rela rela[1]; |
| 9064 | }; |
| 9065 | |
| 9066 | static int |
| 9067 | elf_link_sort_cmp1 (const void *A, const void *B) |
| 9068 | { |
| 9069 | const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A; |
| 9070 | const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B; |
| 9071 | int relativea, relativeb; |
| 9072 | |
| 9073 | relativea = a->type == reloc_class_relative; |
| 9074 | relativeb = b->type == reloc_class_relative; |
| 9075 | |
| 9076 | if (relativea < relativeb) |
| 9077 | return 1; |
| 9078 | if (relativea > relativeb) |
| 9079 | return -1; |
| 9080 | if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask)) |
| 9081 | return -1; |
| 9082 | if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask)) |
| 9083 | return 1; |
| 9084 | if (a->rela->r_offset < b->rela->r_offset) |
| 9085 | return -1; |
| 9086 | if (a->rela->r_offset > b->rela->r_offset) |
| 9087 | return 1; |
| 9088 | return 0; |
| 9089 | } |
| 9090 | |
| 9091 | static int |
| 9092 | elf_link_sort_cmp2 (const void *A, const void *B) |
| 9093 | { |
| 9094 | const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A; |
| 9095 | const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B; |
| 9096 | |
| 9097 | if (a->type < b->type) |
| 9098 | return -1; |
| 9099 | if (a->type > b->type) |
| 9100 | return 1; |
| 9101 | if (a->u.offset < b->u.offset) |
| 9102 | return -1; |
| 9103 | if (a->u.offset > b->u.offset) |
| 9104 | return 1; |
| 9105 | if (a->rela->r_offset < b->rela->r_offset) |
| 9106 | return -1; |
| 9107 | if (a->rela->r_offset > b->rela->r_offset) |
| 9108 | return 1; |
| 9109 | return 0; |
| 9110 | } |
| 9111 | |
| 9112 | static size_t |
| 9113 | elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec) |
| 9114 | { |
| 9115 | asection *dynamic_relocs; |
| 9116 | asection *rela_dyn; |
| 9117 | asection *rel_dyn; |
| 9118 | bfd_size_type count, size; |
| 9119 | size_t i, ret, sort_elt, ext_size; |
| 9120 | bfd_byte *sort, *s_non_relative, *p; |
| 9121 | struct elf_link_sort_rela *sq; |
| 9122 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 9123 | int i2e = bed->s->int_rels_per_ext_rel; |
| 9124 | unsigned int opb = bfd_octets_per_byte (abfd); |
| 9125 | void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *); |
| 9126 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
| 9127 | struct bfd_link_order *lo; |
| 9128 | bfd_vma r_sym_mask; |
| 9129 | bfd_boolean use_rela; |
| 9130 | |
| 9131 | /* Find a dynamic reloc section. */ |
| 9132 | rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn"); |
| 9133 | rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn"); |
| 9134 | if (rela_dyn != NULL && rela_dyn->size > 0 |
| 9135 | && rel_dyn != NULL && rel_dyn->size > 0) |
| 9136 | { |
| 9137 | bfd_boolean use_rela_initialised = FALSE; |
| 9138 | |
| 9139 | /* This is just here to stop gcc from complaining. |
| 9140 | Its initialization checking code is not perfect. */ |
| 9141 | use_rela = TRUE; |
| 9142 | |
| 9143 | /* Both sections are present. Examine the sizes |
| 9144 | of the indirect sections to help us choose. */ |
| 9145 | for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next) |
| 9146 | if (lo->type == bfd_indirect_link_order) |
| 9147 | { |
| 9148 | asection *o = lo->u.indirect.section; |
| 9149 | |
| 9150 | if ((o->size % bed->s->sizeof_rela) == 0) |
| 9151 | { |
| 9152 | if ((o->size % bed->s->sizeof_rel) == 0) |
| 9153 | /* Section size is divisible by both rel and rela sizes. |
| 9154 | It is of no help to us. */ |
| 9155 | ; |
| 9156 | else |
| 9157 | { |
| 9158 | /* Section size is only divisible by rela. */ |
| 9159 | if (use_rela_initialised && !use_rela) |
| 9160 | { |
| 9161 | _bfd_error_handler (_("%pB: unable to sort relocs - " |
| 9162 | "they are in more than one size"), |
| 9163 | abfd); |
| 9164 | bfd_set_error (bfd_error_invalid_operation); |
| 9165 | return 0; |
| 9166 | } |
| 9167 | else |
| 9168 | { |
| 9169 | use_rela = TRUE; |
| 9170 | use_rela_initialised = TRUE; |
| 9171 | } |
| 9172 | } |
| 9173 | } |
| 9174 | else if ((o->size % bed->s->sizeof_rel) == 0) |
| 9175 | { |
| 9176 | /* Section size is only divisible by rel. */ |
| 9177 | if (use_rela_initialised && use_rela) |
| 9178 | { |
| 9179 | _bfd_error_handler (_("%pB: unable to sort relocs - " |
| 9180 | "they are in more than one size"), |
| 9181 | abfd); |
| 9182 | bfd_set_error (bfd_error_invalid_operation); |
| 9183 | return 0; |
| 9184 | } |
| 9185 | else |
| 9186 | { |
| 9187 | use_rela = FALSE; |
| 9188 | use_rela_initialised = TRUE; |
| 9189 | } |
| 9190 | } |
| 9191 | else |
| 9192 | { |
| 9193 | /* The section size is not divisible by either - |
| 9194 | something is wrong. */ |
| 9195 | _bfd_error_handler (_("%pB: unable to sort relocs - " |
| 9196 | "they are of an unknown size"), abfd); |
| 9197 | bfd_set_error (bfd_error_invalid_operation); |
| 9198 | return 0; |
| 9199 | } |
| 9200 | } |
| 9201 | |
| 9202 | for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next) |
| 9203 | if (lo->type == bfd_indirect_link_order) |
| 9204 | { |
| 9205 | asection *o = lo->u.indirect.section; |
| 9206 | |
| 9207 | if ((o->size % bed->s->sizeof_rela) == 0) |
| 9208 | { |
| 9209 | if ((o->size % bed->s->sizeof_rel) == 0) |
| 9210 | /* Section size is divisible by both rel and rela sizes. |
| 9211 | It is of no help to us. */ |
| 9212 | ; |
| 9213 | else |
| 9214 | { |
| 9215 | /* Section size is only divisible by rela. */ |
| 9216 | if (use_rela_initialised && !use_rela) |
| 9217 | { |
| 9218 | _bfd_error_handler (_("%pB: unable to sort relocs - " |
| 9219 | "they are in more than one size"), |
| 9220 | abfd); |
| 9221 | bfd_set_error (bfd_error_invalid_operation); |
| 9222 | return 0; |
| 9223 | } |
| 9224 | else |
| 9225 | { |
| 9226 | use_rela = TRUE; |
| 9227 | use_rela_initialised = TRUE; |
| 9228 | } |
| 9229 | } |
| 9230 | } |
| 9231 | else if ((o->size % bed->s->sizeof_rel) == 0) |
| 9232 | { |
| 9233 | /* Section size is only divisible by rel. */ |
| 9234 | if (use_rela_initialised && use_rela) |
| 9235 | { |
| 9236 | _bfd_error_handler (_("%pB: unable to sort relocs - " |
| 9237 | "they are in more than one size"), |
| 9238 | abfd); |
| 9239 | bfd_set_error (bfd_error_invalid_operation); |
| 9240 | return 0; |
| 9241 | } |
| 9242 | else |
| 9243 | { |
| 9244 | use_rela = FALSE; |
| 9245 | use_rela_initialised = TRUE; |
| 9246 | } |
| 9247 | } |
| 9248 | else |
| 9249 | { |
| 9250 | /* The section size is not divisible by either - |
| 9251 | something is wrong. */ |
| 9252 | _bfd_error_handler (_("%pB: unable to sort relocs - " |
| 9253 | "they are of an unknown size"), abfd); |
| 9254 | bfd_set_error (bfd_error_invalid_operation); |
| 9255 | return 0; |
| 9256 | } |
| 9257 | } |
| 9258 | |
| 9259 | if (! use_rela_initialised) |
| 9260 | /* Make a guess. */ |
| 9261 | use_rela = TRUE; |
| 9262 | } |
| 9263 | else if (rela_dyn != NULL && rela_dyn->size > 0) |
| 9264 | use_rela = TRUE; |
| 9265 | else if (rel_dyn != NULL && rel_dyn->size > 0) |
| 9266 | use_rela = FALSE; |
| 9267 | else |
| 9268 | return 0; |
| 9269 | |
| 9270 | if (use_rela) |
| 9271 | { |
| 9272 | dynamic_relocs = rela_dyn; |
| 9273 | ext_size = bed->s->sizeof_rela; |
| 9274 | swap_in = bed->s->swap_reloca_in; |
| 9275 | swap_out = bed->s->swap_reloca_out; |
| 9276 | } |
| 9277 | else |
| 9278 | { |
| 9279 | dynamic_relocs = rel_dyn; |
| 9280 | ext_size = bed->s->sizeof_rel; |
| 9281 | swap_in = bed->s->swap_reloc_in; |
| 9282 | swap_out = bed->s->swap_reloc_out; |
| 9283 | } |
| 9284 | |
| 9285 | size = 0; |
| 9286 | for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next) |
| 9287 | if (lo->type == bfd_indirect_link_order) |
| 9288 | size += lo->u.indirect.section->size; |
| 9289 | |
| 9290 | if (size != dynamic_relocs->size) |
| 9291 | return 0; |
| 9292 | |
| 9293 | sort_elt = (sizeof (struct elf_link_sort_rela) |
| 9294 | + (i2e - 1) * sizeof (Elf_Internal_Rela)); |
| 9295 | |
| 9296 | count = dynamic_relocs->size / ext_size; |
| 9297 | if (count == 0) |
| 9298 | return 0; |
| 9299 | sort = (bfd_byte *) bfd_zmalloc (sort_elt * count); |
| 9300 | |
| 9301 | if (sort == NULL) |
| 9302 | { |
| 9303 | (*info->callbacks->warning) |
| 9304 | (info, _("not enough memory to sort relocations"), 0, abfd, 0, 0); |
| 9305 | return 0; |
| 9306 | } |
| 9307 | |
| 9308 | if (bed->s->arch_size == 32) |
| 9309 | r_sym_mask = ~(bfd_vma) 0xff; |
| 9310 | else |
| 9311 | r_sym_mask = ~(bfd_vma) 0xffffffff; |
| 9312 | |
| 9313 | for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next) |
| 9314 | if (lo->type == bfd_indirect_link_order) |
| 9315 | { |
| 9316 | bfd_byte *erel, *erelend; |
| 9317 | asection *o = lo->u.indirect.section; |
| 9318 | |
| 9319 | if (o->contents == NULL && o->size != 0) |
| 9320 | { |
| 9321 | /* This is a reloc section that is being handled as a normal |
| 9322 | section. See bfd_section_from_shdr. We can't combine |
| 9323 | relocs in this case. */ |
| 9324 | free (sort); |
| 9325 | return 0; |
| 9326 | } |
| 9327 | erel = o->contents; |
| 9328 | erelend = o->contents + o->size; |
| 9329 | p = sort + o->output_offset * opb / ext_size * sort_elt; |
| 9330 | |
| 9331 | while (erel < erelend) |
| 9332 | { |
| 9333 | struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p; |
| 9334 | |
| 9335 | (*swap_in) (abfd, erel, s->rela); |
| 9336 | s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela); |
| 9337 | s->u.sym_mask = r_sym_mask; |
| 9338 | p += sort_elt; |
| 9339 | erel += ext_size; |
| 9340 | } |
| 9341 | } |
| 9342 | |
| 9343 | qsort (sort, count, sort_elt, elf_link_sort_cmp1); |
| 9344 | |
| 9345 | for (i = 0, p = sort; i < count; i++, p += sort_elt) |
| 9346 | { |
| 9347 | struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p; |
| 9348 | if (s->type != reloc_class_relative) |
| 9349 | break; |
| 9350 | } |
| 9351 | ret = i; |
| 9352 | s_non_relative = p; |
| 9353 | |
| 9354 | sq = (struct elf_link_sort_rela *) s_non_relative; |
| 9355 | for (; i < count; i++, p += sort_elt) |
| 9356 | { |
| 9357 | struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p; |
| 9358 | if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0) |
| 9359 | sq = sp; |
| 9360 | sp->u.offset = sq->rela->r_offset; |
| 9361 | } |
| 9362 | |
| 9363 | qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2); |
| 9364 | |
| 9365 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 9366 | if (htab->srelplt && htab->srelplt->output_section == dynamic_relocs) |
| 9367 | { |
| 9368 | /* We have plt relocs in .rela.dyn. */ |
| 9369 | sq = (struct elf_link_sort_rela *) sort; |
| 9370 | for (i = 0; i < count; i++) |
| 9371 | if (sq[count - i - 1].type != reloc_class_plt) |
| 9372 | break; |
| 9373 | if (i != 0 && htab->srelplt->size == i * ext_size) |
| 9374 | { |
| 9375 | struct bfd_link_order **plo; |
| 9376 | /* Put srelplt link_order last. This is so the output_offset |
| 9377 | set in the next loop is correct for DT_JMPREL. */ |
| 9378 | for (plo = &dynamic_relocs->map_head.link_order; *plo != NULL; ) |
| 9379 | if ((*plo)->type == bfd_indirect_link_order |
| 9380 | && (*plo)->u.indirect.section == htab->srelplt) |
| 9381 | { |
| 9382 | lo = *plo; |
| 9383 | *plo = lo->next; |
| 9384 | } |
| 9385 | else |
| 9386 | plo = &(*plo)->next; |
| 9387 | *plo = lo; |
| 9388 | lo->next = NULL; |
| 9389 | dynamic_relocs->map_tail.link_order = lo; |
| 9390 | } |
| 9391 | } |
| 9392 | |
| 9393 | p = sort; |
| 9394 | for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next) |
| 9395 | if (lo->type == bfd_indirect_link_order) |
| 9396 | { |
| 9397 | bfd_byte *erel, *erelend; |
| 9398 | asection *o = lo->u.indirect.section; |
| 9399 | |
| 9400 | erel = o->contents; |
| 9401 | erelend = o->contents + o->size; |
| 9402 | o->output_offset = (p - sort) / sort_elt * ext_size / opb; |
| 9403 | while (erel < erelend) |
| 9404 | { |
| 9405 | struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p; |
| 9406 | (*swap_out) (abfd, s->rela, erel); |
| 9407 | p += sort_elt; |
| 9408 | erel += ext_size; |
| 9409 | } |
| 9410 | } |
| 9411 | |
| 9412 | free (sort); |
| 9413 | *psec = dynamic_relocs; |
| 9414 | return ret; |
| 9415 | } |
| 9416 | |
| 9417 | /* Add a symbol to the output symbol string table. */ |
| 9418 | |
| 9419 | static int |
| 9420 | elf_link_output_symstrtab (struct elf_final_link_info *flinfo, |
| 9421 | const char *name, |
| 9422 | Elf_Internal_Sym *elfsym, |
| 9423 | asection *input_sec, |
| 9424 | struct elf_link_hash_entry *h) |
| 9425 | { |
| 9426 | int (*output_symbol_hook) |
| 9427 | (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *, |
| 9428 | struct elf_link_hash_entry *); |
| 9429 | struct elf_link_hash_table *hash_table; |
| 9430 | const struct elf_backend_data *bed; |
| 9431 | bfd_size_type strtabsize; |
| 9432 | |
| 9433 | BFD_ASSERT (elf_onesymtab (flinfo->output_bfd)); |
| 9434 | |
| 9435 | bed = get_elf_backend_data (flinfo->output_bfd); |
| 9436 | output_symbol_hook = bed->elf_backend_link_output_symbol_hook; |
| 9437 | if (output_symbol_hook != NULL) |
| 9438 | { |
| 9439 | int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h); |
| 9440 | if (ret != 1) |
| 9441 | return ret; |
| 9442 | } |
| 9443 | |
| 9444 | if (ELF_ST_TYPE (elfsym->st_info) == STT_GNU_IFUNC) |
| 9445 | elf_tdata (flinfo->output_bfd)->has_gnu_osabi |= elf_gnu_osabi_ifunc; |
| 9446 | if (ELF_ST_BIND (elfsym->st_info) == STB_GNU_UNIQUE) |
| 9447 | elf_tdata (flinfo->output_bfd)->has_gnu_osabi |= elf_gnu_osabi_unique; |
| 9448 | |
| 9449 | if (name == NULL |
| 9450 | || *name == '\0' |
| 9451 | || (input_sec->flags & SEC_EXCLUDE)) |
| 9452 | elfsym->st_name = (unsigned long) -1; |
| 9453 | else |
| 9454 | { |
| 9455 | /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize |
| 9456 | to get the final offset for st_name. */ |
| 9457 | elfsym->st_name |
| 9458 | = (unsigned long) _bfd_elf_strtab_add (flinfo->symstrtab, |
| 9459 | name, FALSE); |
| 9460 | if (elfsym->st_name == (unsigned long) -1) |
| 9461 | return 0; |
| 9462 | } |
| 9463 | |
| 9464 | hash_table = elf_hash_table (flinfo->info); |
| 9465 | strtabsize = hash_table->strtabsize; |
| 9466 | if (strtabsize <= hash_table->strtabcount) |
| 9467 | { |
| 9468 | strtabsize += strtabsize; |
| 9469 | hash_table->strtabsize = strtabsize; |
| 9470 | strtabsize *= sizeof (*hash_table->strtab); |
| 9471 | hash_table->strtab |
| 9472 | = (struct elf_sym_strtab *) bfd_realloc (hash_table->strtab, |
| 9473 | strtabsize); |
| 9474 | if (hash_table->strtab == NULL) |
| 9475 | return 0; |
| 9476 | } |
| 9477 | hash_table->strtab[hash_table->strtabcount].sym = *elfsym; |
| 9478 | hash_table->strtab[hash_table->strtabcount].dest_index |
| 9479 | = hash_table->strtabcount; |
| 9480 | hash_table->strtab[hash_table->strtabcount].destshndx_index |
| 9481 | = flinfo->symshndxbuf ? bfd_get_symcount (flinfo->output_bfd) : 0; |
| 9482 | |
| 9483 | bfd_get_symcount (flinfo->output_bfd) += 1; |
| 9484 | hash_table->strtabcount += 1; |
| 9485 | |
| 9486 | return 1; |
| 9487 | } |
| 9488 | |
| 9489 | /* Swap symbols out to the symbol table and flush the output symbols to |
| 9490 | the file. */ |
| 9491 | |
| 9492 | static bfd_boolean |
| 9493 | elf_link_swap_symbols_out (struct elf_final_link_info *flinfo) |
| 9494 | { |
| 9495 | struct elf_link_hash_table *hash_table = elf_hash_table (flinfo->info); |
| 9496 | bfd_size_type amt; |
| 9497 | size_t i; |
| 9498 | const struct elf_backend_data *bed; |
| 9499 | bfd_byte *symbuf; |
| 9500 | Elf_Internal_Shdr *hdr; |
| 9501 | file_ptr pos; |
| 9502 | bfd_boolean ret; |
| 9503 | |
| 9504 | if (!hash_table->strtabcount) |
| 9505 | return TRUE; |
| 9506 | |
| 9507 | BFD_ASSERT (elf_onesymtab (flinfo->output_bfd)); |
| 9508 | |
| 9509 | bed = get_elf_backend_data (flinfo->output_bfd); |
| 9510 | |
| 9511 | amt = bed->s->sizeof_sym * hash_table->strtabcount; |
| 9512 | symbuf = (bfd_byte *) bfd_malloc (amt); |
| 9513 | if (symbuf == NULL) |
| 9514 | return FALSE; |
| 9515 | |
| 9516 | if (flinfo->symshndxbuf) |
| 9517 | { |
| 9518 | amt = sizeof (Elf_External_Sym_Shndx); |
| 9519 | amt *= bfd_get_symcount (flinfo->output_bfd); |
| 9520 | flinfo->symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt); |
| 9521 | if (flinfo->symshndxbuf == NULL) |
| 9522 | { |
| 9523 | free (symbuf); |
| 9524 | return FALSE; |
| 9525 | } |
| 9526 | } |
| 9527 | |
| 9528 | for (i = 0; i < hash_table->strtabcount; i++) |
| 9529 | { |
| 9530 | struct elf_sym_strtab *elfsym = &hash_table->strtab[i]; |
| 9531 | if (elfsym->sym.st_name == (unsigned long) -1) |
| 9532 | elfsym->sym.st_name = 0; |
| 9533 | else |
| 9534 | elfsym->sym.st_name |
| 9535 | = (unsigned long) _bfd_elf_strtab_offset (flinfo->symstrtab, |
| 9536 | elfsym->sym.st_name); |
| 9537 | bed->s->swap_symbol_out (flinfo->output_bfd, &elfsym->sym, |
| 9538 | ((bfd_byte *) symbuf |
| 9539 | + (elfsym->dest_index |
| 9540 | * bed->s->sizeof_sym)), |
| 9541 | (flinfo->symshndxbuf |
| 9542 | + elfsym->destshndx_index)); |
| 9543 | } |
| 9544 | |
| 9545 | hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr; |
| 9546 | pos = hdr->sh_offset + hdr->sh_size; |
| 9547 | amt = hash_table->strtabcount * bed->s->sizeof_sym; |
| 9548 | if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) == 0 |
| 9549 | && bfd_bwrite (symbuf, amt, flinfo->output_bfd) == amt) |
| 9550 | { |
| 9551 | hdr->sh_size += amt; |
| 9552 | ret = TRUE; |
| 9553 | } |
| 9554 | else |
| 9555 | ret = FALSE; |
| 9556 | |
| 9557 | free (symbuf); |
| 9558 | |
| 9559 | free (hash_table->strtab); |
| 9560 | hash_table->strtab = NULL; |
| 9561 | |
| 9562 | return ret; |
| 9563 | } |
| 9564 | |
| 9565 | /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */ |
| 9566 | |
| 9567 | static bfd_boolean |
| 9568 | check_dynsym (bfd *abfd, Elf_Internal_Sym *sym) |
| 9569 | { |
| 9570 | if (sym->st_shndx >= (SHN_LORESERVE & 0xffff) |
| 9571 | && sym->st_shndx < SHN_LORESERVE) |
| 9572 | { |
| 9573 | /* The gABI doesn't support dynamic symbols in output sections |
| 9574 | beyond 64k. */ |
| 9575 | _bfd_error_handler |
| 9576 | /* xgettext:c-format */ |
| 9577 | (_("%pB: too many sections: %d (>= %d)"), |
| 9578 | abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff); |
| 9579 | bfd_set_error (bfd_error_nonrepresentable_section); |
| 9580 | return FALSE; |
| 9581 | } |
| 9582 | return TRUE; |
| 9583 | } |
| 9584 | |
| 9585 | /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in |
| 9586 | allowing an unsatisfied unversioned symbol in the DSO to match a |
| 9587 | versioned symbol that would normally require an explicit version. |
| 9588 | We also handle the case that a DSO references a hidden symbol |
| 9589 | which may be satisfied by a versioned symbol in another DSO. */ |
| 9590 | |
| 9591 | static bfd_boolean |
| 9592 | elf_link_check_versioned_symbol (struct bfd_link_info *info, |
| 9593 | const struct elf_backend_data *bed, |
| 9594 | struct elf_link_hash_entry *h) |
| 9595 | { |
| 9596 | bfd *abfd; |
| 9597 | struct elf_link_loaded_list *loaded; |
| 9598 | |
| 9599 | if (!is_elf_hash_table (info->hash)) |
| 9600 | return FALSE; |
| 9601 | |
| 9602 | /* Check indirect symbol. */ |
| 9603 | while (h->root.type == bfd_link_hash_indirect) |
| 9604 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 9605 | |
| 9606 | switch (h->root.type) |
| 9607 | { |
| 9608 | default: |
| 9609 | abfd = NULL; |
| 9610 | break; |
| 9611 | |
| 9612 | case bfd_link_hash_undefined: |
| 9613 | case bfd_link_hash_undefweak: |
| 9614 | abfd = h->root.u.undef.abfd; |
| 9615 | if (abfd == NULL |
| 9616 | || (abfd->flags & DYNAMIC) == 0 |
| 9617 | || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0) |
| 9618 | return FALSE; |
| 9619 | break; |
| 9620 | |
| 9621 | case bfd_link_hash_defined: |
| 9622 | case bfd_link_hash_defweak: |
| 9623 | abfd = h->root.u.def.section->owner; |
| 9624 | break; |
| 9625 | |
| 9626 | case bfd_link_hash_common: |
| 9627 | abfd = h->root.u.c.p->section->owner; |
| 9628 | break; |
| 9629 | } |
| 9630 | BFD_ASSERT (abfd != NULL); |
| 9631 | |
| 9632 | for (loaded = elf_hash_table (info)->loaded; |
| 9633 | loaded != NULL; |
| 9634 | loaded = loaded->next) |
| 9635 | { |
| 9636 | bfd *input; |
| 9637 | Elf_Internal_Shdr *hdr; |
| 9638 | size_t symcount; |
| 9639 | size_t extsymcount; |
| 9640 | size_t extsymoff; |
| 9641 | Elf_Internal_Shdr *versymhdr; |
| 9642 | Elf_Internal_Sym *isym; |
| 9643 | Elf_Internal_Sym *isymend; |
| 9644 | Elf_Internal_Sym *isymbuf; |
| 9645 | Elf_External_Versym *ever; |
| 9646 | Elf_External_Versym *extversym; |
| 9647 | |
| 9648 | input = loaded->abfd; |
| 9649 | |
| 9650 | /* We check each DSO for a possible hidden versioned definition. */ |
| 9651 | if (input == abfd |
| 9652 | || (input->flags & DYNAMIC) == 0 |
| 9653 | || elf_dynversym (input) == 0) |
| 9654 | continue; |
| 9655 | |
| 9656 | hdr = &elf_tdata (input)->dynsymtab_hdr; |
| 9657 | |
| 9658 | symcount = hdr->sh_size / bed->s->sizeof_sym; |
| 9659 | if (elf_bad_symtab (input)) |
| 9660 | { |
| 9661 | extsymcount = symcount; |
| 9662 | extsymoff = 0; |
| 9663 | } |
| 9664 | else |
| 9665 | { |
| 9666 | extsymcount = symcount - hdr->sh_info; |
| 9667 | extsymoff = hdr->sh_info; |
| 9668 | } |
| 9669 | |
| 9670 | if (extsymcount == 0) |
| 9671 | continue; |
| 9672 | |
| 9673 | isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff, |
| 9674 | NULL, NULL, NULL); |
| 9675 | if (isymbuf == NULL) |
| 9676 | return FALSE; |
| 9677 | |
| 9678 | /* Read in any version definitions. */ |
| 9679 | versymhdr = &elf_tdata (input)->dynversym_hdr; |
| 9680 | extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size); |
| 9681 | if (extversym == NULL) |
| 9682 | goto error_ret; |
| 9683 | |
| 9684 | if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0 |
| 9685 | || (bfd_bread (extversym, versymhdr->sh_size, input) |
| 9686 | != versymhdr->sh_size)) |
| 9687 | { |
| 9688 | free (extversym); |
| 9689 | error_ret: |
| 9690 | free (isymbuf); |
| 9691 | return FALSE; |
| 9692 | } |
| 9693 | |
| 9694 | ever = extversym + extsymoff; |
| 9695 | isymend = isymbuf + extsymcount; |
| 9696 | for (isym = isymbuf; isym < isymend; isym++, ever++) |
| 9697 | { |
| 9698 | const char *name; |
| 9699 | Elf_Internal_Versym iver; |
| 9700 | unsigned short version_index; |
| 9701 | |
| 9702 | if (ELF_ST_BIND (isym->st_info) == STB_LOCAL |
| 9703 | || isym->st_shndx == SHN_UNDEF) |
| 9704 | continue; |
| 9705 | |
| 9706 | name = bfd_elf_string_from_elf_section (input, |
| 9707 | hdr->sh_link, |
| 9708 | isym->st_name); |
| 9709 | if (strcmp (name, h->root.root.string) != 0) |
| 9710 | continue; |
| 9711 | |
| 9712 | _bfd_elf_swap_versym_in (input, ever, &iver); |
| 9713 | |
| 9714 | if ((iver.vs_vers & VERSYM_HIDDEN) == 0 |
| 9715 | && !(h->def_regular |
| 9716 | && h->forced_local)) |
| 9717 | { |
| 9718 | /* If we have a non-hidden versioned sym, then it should |
| 9719 | have provided a definition for the undefined sym unless |
| 9720 | it is defined in a non-shared object and forced local. |
| 9721 | */ |
| 9722 | abort (); |
| 9723 | } |
| 9724 | |
| 9725 | version_index = iver.vs_vers & VERSYM_VERSION; |
| 9726 | if (version_index == 1 || version_index == 2) |
| 9727 | { |
| 9728 | /* This is the base or first version. We can use it. */ |
| 9729 | free (extversym); |
| 9730 | free (isymbuf); |
| 9731 | return TRUE; |
| 9732 | } |
| 9733 | } |
| 9734 | |
| 9735 | free (extversym); |
| 9736 | free (isymbuf); |
| 9737 | } |
| 9738 | |
| 9739 | return FALSE; |
| 9740 | } |
| 9741 | |
| 9742 | /* Convert ELF common symbol TYPE. */ |
| 9743 | |
| 9744 | static int |
| 9745 | elf_link_convert_common_type (struct bfd_link_info *info, int type) |
| 9746 | { |
| 9747 | /* Commom symbol can only appear in relocatable link. */ |
| 9748 | if (!bfd_link_relocatable (info)) |
| 9749 | abort (); |
| 9750 | switch (info->elf_stt_common) |
| 9751 | { |
| 9752 | case unchanged: |
| 9753 | break; |
| 9754 | case elf_stt_common: |
| 9755 | type = STT_COMMON; |
| 9756 | break; |
| 9757 | case no_elf_stt_common: |
| 9758 | type = STT_OBJECT; |
| 9759 | break; |
| 9760 | } |
| 9761 | return type; |
| 9762 | } |
| 9763 | |
| 9764 | /* Add an external symbol to the symbol table. This is called from |
| 9765 | the hash table traversal routine. When generating a shared object, |
| 9766 | we go through the symbol table twice. The first time we output |
| 9767 | anything that might have been forced to local scope in a version |
| 9768 | script. The second time we output the symbols that are still |
| 9769 | global symbols. */ |
| 9770 | |
| 9771 | static bfd_boolean |
| 9772 | elf_link_output_extsym (struct bfd_hash_entry *bh, void *data) |
| 9773 | { |
| 9774 | struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh; |
| 9775 | struct elf_outext_info *eoinfo = (struct elf_outext_info *) data; |
| 9776 | struct elf_final_link_info *flinfo = eoinfo->flinfo; |
| 9777 | bfd_boolean strip; |
| 9778 | Elf_Internal_Sym sym; |
| 9779 | asection *input_sec; |
| 9780 | const struct elf_backend_data *bed; |
| 9781 | long indx; |
| 9782 | int ret; |
| 9783 | unsigned int type; |
| 9784 | |
| 9785 | if (h->root.type == bfd_link_hash_warning) |
| 9786 | { |
| 9787 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 9788 | if (h->root.type == bfd_link_hash_new) |
| 9789 | return TRUE; |
| 9790 | } |
| 9791 | |
| 9792 | /* Decide whether to output this symbol in this pass. */ |
| 9793 | if (eoinfo->localsyms) |
| 9794 | { |
| 9795 | if (!h->forced_local) |
| 9796 | return TRUE; |
| 9797 | } |
| 9798 | else |
| 9799 | { |
| 9800 | if (h->forced_local) |
| 9801 | return TRUE; |
| 9802 | } |
| 9803 | |
| 9804 | bed = get_elf_backend_data (flinfo->output_bfd); |
| 9805 | |
| 9806 | if (h->root.type == bfd_link_hash_undefined) |
| 9807 | { |
| 9808 | /* If we have an undefined symbol reference here then it must have |
| 9809 | come from a shared library that is being linked in. (Undefined |
| 9810 | references in regular files have already been handled unless |
| 9811 | they are in unreferenced sections which are removed by garbage |
| 9812 | collection). */ |
| 9813 | bfd_boolean ignore_undef = FALSE; |
| 9814 | |
| 9815 | /* Some symbols may be special in that the fact that they're |
| 9816 | undefined can be safely ignored - let backend determine that. */ |
| 9817 | if (bed->elf_backend_ignore_undef_symbol) |
| 9818 | ignore_undef = bed->elf_backend_ignore_undef_symbol (h); |
| 9819 | |
| 9820 | /* If we are reporting errors for this situation then do so now. */ |
| 9821 | if (!ignore_undef |
| 9822 | && h->ref_dynamic_nonweak |
| 9823 | && (!h->ref_regular || flinfo->info->gc_sections) |
| 9824 | && !elf_link_check_versioned_symbol (flinfo->info, bed, h) |
| 9825 | && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE) |
| 9826 | (*flinfo->info->callbacks->undefined_symbol) |
| 9827 | (flinfo->info, h->root.root.string, |
| 9828 | h->ref_regular ? NULL : h->root.u.undef.abfd, |
| 9829 | NULL, 0, |
| 9830 | flinfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR); |
| 9831 | |
| 9832 | /* Strip a global symbol defined in a discarded section. */ |
| 9833 | if (h->indx == -3) |
| 9834 | return TRUE; |
| 9835 | } |
| 9836 | |
| 9837 | /* We should also warn if a forced local symbol is referenced from |
| 9838 | shared libraries. */ |
| 9839 | if (bfd_link_executable (flinfo->info) |
| 9840 | && h->forced_local |
| 9841 | && h->ref_dynamic |
| 9842 | && h->def_regular |
| 9843 | && !h->dynamic_def |
| 9844 | && h->ref_dynamic_nonweak |
| 9845 | && !elf_link_check_versioned_symbol (flinfo->info, bed, h)) |
| 9846 | { |
| 9847 | bfd *def_bfd; |
| 9848 | const char *msg; |
| 9849 | struct elf_link_hash_entry *hi = h; |
| 9850 | |
| 9851 | /* Check indirect symbol. */ |
| 9852 | while (hi->root.type == bfd_link_hash_indirect) |
| 9853 | hi = (struct elf_link_hash_entry *) hi->root.u.i.link; |
| 9854 | |
| 9855 | if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL) |
| 9856 | /* xgettext:c-format */ |
| 9857 | msg = _("%pB: internal symbol `%s' in %pB is referenced by DSO"); |
| 9858 | else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN) |
| 9859 | /* xgettext:c-format */ |
| 9860 | msg = _("%pB: hidden symbol `%s' in %pB is referenced by DSO"); |
| 9861 | else |
| 9862 | /* xgettext:c-format */ |
| 9863 | msg = _("%pB: local symbol `%s' in %pB is referenced by DSO"); |
| 9864 | def_bfd = flinfo->output_bfd; |
| 9865 | if (hi->root.u.def.section != bfd_abs_section_ptr) |
| 9866 | def_bfd = hi->root.u.def.section->owner; |
| 9867 | _bfd_error_handler (msg, flinfo->output_bfd, |
| 9868 | h->root.root.string, def_bfd); |
| 9869 | bfd_set_error (bfd_error_bad_value); |
| 9870 | eoinfo->failed = TRUE; |
| 9871 | return FALSE; |
| 9872 | } |
| 9873 | |
| 9874 | /* We don't want to output symbols that have never been mentioned by |
| 9875 | a regular file, or that we have been told to strip. However, if |
| 9876 | h->indx is set to -2, the symbol is used by a reloc and we must |
| 9877 | output it. */ |
| 9878 | strip = FALSE; |
| 9879 | if (h->indx == -2) |
| 9880 | ; |
| 9881 | else if ((h->def_dynamic |
| 9882 | || h->ref_dynamic |
| 9883 | || h->root.type == bfd_link_hash_new) |
| 9884 | && !h->def_regular |
| 9885 | && !h->ref_regular) |
| 9886 | strip = TRUE; |
| 9887 | else if (flinfo->info->strip == strip_all) |
| 9888 | strip = TRUE; |
| 9889 | else if (flinfo->info->strip == strip_some |
| 9890 | && bfd_hash_lookup (flinfo->info->keep_hash, |
| 9891 | h->root.root.string, FALSE, FALSE) == NULL) |
| 9892 | strip = TRUE; |
| 9893 | else if ((h->root.type == bfd_link_hash_defined |
| 9894 | || h->root.type == bfd_link_hash_defweak) |
| 9895 | && ((flinfo->info->strip_discarded |
| 9896 | && discarded_section (h->root.u.def.section)) |
| 9897 | || ((h->root.u.def.section->flags & SEC_LINKER_CREATED) == 0 |
| 9898 | && h->root.u.def.section->owner != NULL |
| 9899 | && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0))) |
| 9900 | strip = TRUE; |
| 9901 | else if ((h->root.type == bfd_link_hash_undefined |
| 9902 | || h->root.type == bfd_link_hash_undefweak) |
| 9903 | && h->root.u.undef.abfd != NULL |
| 9904 | && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0) |
| 9905 | strip = TRUE; |
| 9906 | |
| 9907 | type = h->type; |
| 9908 | |
| 9909 | /* If we're stripping it, and it's not a dynamic symbol, there's |
| 9910 | nothing else to do. However, if it is a forced local symbol or |
| 9911 | an ifunc symbol we need to give the backend finish_dynamic_symbol |
| 9912 | function a chance to make it dynamic. */ |
| 9913 | if (strip |
| 9914 | && h->dynindx == -1 |
| 9915 | && type != STT_GNU_IFUNC |
| 9916 | && !h->forced_local) |
| 9917 | return TRUE; |
| 9918 | |
| 9919 | sym.st_value = 0; |
| 9920 | sym.st_size = h->size; |
| 9921 | sym.st_other = h->other; |
| 9922 | switch (h->root.type) |
| 9923 | { |
| 9924 | default: |
| 9925 | case bfd_link_hash_new: |
| 9926 | case bfd_link_hash_warning: |
| 9927 | abort (); |
| 9928 | return FALSE; |
| 9929 | |
| 9930 | case bfd_link_hash_undefined: |
| 9931 | case bfd_link_hash_undefweak: |
| 9932 | input_sec = bfd_und_section_ptr; |
| 9933 | sym.st_shndx = SHN_UNDEF; |
| 9934 | break; |
| 9935 | |
| 9936 | case bfd_link_hash_defined: |
| 9937 | case bfd_link_hash_defweak: |
| 9938 | { |
| 9939 | input_sec = h->root.u.def.section; |
| 9940 | if (input_sec->output_section != NULL) |
| 9941 | { |
| 9942 | sym.st_shndx = |
| 9943 | _bfd_elf_section_from_bfd_section (flinfo->output_bfd, |
| 9944 | input_sec->output_section); |
| 9945 | if (sym.st_shndx == SHN_BAD) |
| 9946 | { |
| 9947 | _bfd_error_handler |
| 9948 | /* xgettext:c-format */ |
| 9949 | (_("%pB: could not find output section %pA for input section %pA"), |
| 9950 | flinfo->output_bfd, input_sec->output_section, input_sec); |
| 9951 | bfd_set_error (bfd_error_nonrepresentable_section); |
| 9952 | eoinfo->failed = TRUE; |
| 9953 | return FALSE; |
| 9954 | } |
| 9955 | |
| 9956 | /* ELF symbols in relocatable files are section relative, |
| 9957 | but in nonrelocatable files they are virtual |
| 9958 | addresses. */ |
| 9959 | sym.st_value = h->root.u.def.value + input_sec->output_offset; |
| 9960 | if (!bfd_link_relocatable (flinfo->info)) |
| 9961 | { |
| 9962 | sym.st_value += input_sec->output_section->vma; |
| 9963 | if (h->type == STT_TLS) |
| 9964 | { |
| 9965 | asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec; |
| 9966 | if (tls_sec != NULL) |
| 9967 | sym.st_value -= tls_sec->vma; |
| 9968 | } |
| 9969 | } |
| 9970 | } |
| 9971 | else |
| 9972 | { |
| 9973 | BFD_ASSERT (input_sec->owner == NULL |
| 9974 | || (input_sec->owner->flags & DYNAMIC) != 0); |
| 9975 | sym.st_shndx = SHN_UNDEF; |
| 9976 | input_sec = bfd_und_section_ptr; |
| 9977 | } |
| 9978 | } |
| 9979 | break; |
| 9980 | |
| 9981 | case bfd_link_hash_common: |
| 9982 | input_sec = h->root.u.c.p->section; |
| 9983 | sym.st_shndx = bed->common_section_index (input_sec); |
| 9984 | sym.st_value = 1 << h->root.u.c.p->alignment_power; |
| 9985 | break; |
| 9986 | |
| 9987 | case bfd_link_hash_indirect: |
| 9988 | /* These symbols are created by symbol versioning. They point |
| 9989 | to the decorated version of the name. For example, if the |
| 9990 | symbol foo@@GNU_1.2 is the default, which should be used when |
| 9991 | foo is used with no version, then we add an indirect symbol |
| 9992 | foo which points to foo@@GNU_1.2. We ignore these symbols, |
| 9993 | since the indirected symbol is already in the hash table. */ |
| 9994 | return TRUE; |
| 9995 | } |
| 9996 | |
| 9997 | if (type == STT_COMMON || type == STT_OBJECT) |
| 9998 | switch (h->root.type) |
| 9999 | { |
| 10000 | case bfd_link_hash_common: |
| 10001 | type = elf_link_convert_common_type (flinfo->info, type); |
| 10002 | break; |
| 10003 | case bfd_link_hash_defined: |
| 10004 | case bfd_link_hash_defweak: |
| 10005 | if (bed->common_definition (&sym)) |
| 10006 | type = elf_link_convert_common_type (flinfo->info, type); |
| 10007 | else |
| 10008 | type = STT_OBJECT; |
| 10009 | break; |
| 10010 | case bfd_link_hash_undefined: |
| 10011 | case bfd_link_hash_undefweak: |
| 10012 | break; |
| 10013 | default: |
| 10014 | abort (); |
| 10015 | } |
| 10016 | |
| 10017 | if (h->forced_local) |
| 10018 | { |
| 10019 | sym.st_info = ELF_ST_INFO (STB_LOCAL, type); |
| 10020 | /* Turn off visibility on local symbol. */ |
| 10021 | sym.st_other &= ~ELF_ST_VISIBILITY (-1); |
| 10022 | } |
| 10023 | /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */ |
| 10024 | else if (h->unique_global && h->def_regular) |
| 10025 | sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, type); |
| 10026 | else if (h->root.type == bfd_link_hash_undefweak |
| 10027 | || h->root.type == bfd_link_hash_defweak) |
| 10028 | sym.st_info = ELF_ST_INFO (STB_WEAK, type); |
| 10029 | else |
| 10030 | sym.st_info = ELF_ST_INFO (STB_GLOBAL, type); |
| 10031 | sym.st_target_internal = h->target_internal; |
| 10032 | |
| 10033 | /* Give the processor backend a chance to tweak the symbol value, |
| 10034 | and also to finish up anything that needs to be done for this |
| 10035 | symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for |
| 10036 | forced local syms when non-shared is due to a historical quirk. |
| 10037 | STT_GNU_IFUNC symbol must go through PLT. */ |
| 10038 | if ((h->type == STT_GNU_IFUNC |
| 10039 | && h->def_regular |
| 10040 | && !bfd_link_relocatable (flinfo->info)) |
| 10041 | || ((h->dynindx != -1 |
| 10042 | || h->forced_local) |
| 10043 | && ((bfd_link_pic (flinfo->info) |
| 10044 | && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 10045 | || h->root.type != bfd_link_hash_undefweak)) |
| 10046 | || !h->forced_local) |
| 10047 | && elf_hash_table (flinfo->info)->dynamic_sections_created)) |
| 10048 | { |
| 10049 | if (! ((*bed->elf_backend_finish_dynamic_symbol) |
| 10050 | (flinfo->output_bfd, flinfo->info, h, &sym))) |
| 10051 | { |
| 10052 | eoinfo->failed = TRUE; |
| 10053 | return FALSE; |
| 10054 | } |
| 10055 | } |
| 10056 | |
| 10057 | /* If we are marking the symbol as undefined, and there are no |
| 10058 | non-weak references to this symbol from a regular object, then |
| 10059 | mark the symbol as weak undefined; if there are non-weak |
| 10060 | references, mark the symbol as strong. We can't do this earlier, |
| 10061 | because it might not be marked as undefined until the |
| 10062 | finish_dynamic_symbol routine gets through with it. */ |
| 10063 | if (sym.st_shndx == SHN_UNDEF |
| 10064 | && h->ref_regular |
| 10065 | && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL |
| 10066 | || ELF_ST_BIND (sym.st_info) == STB_WEAK)) |
| 10067 | { |
| 10068 | int bindtype; |
| 10069 | type = ELF_ST_TYPE (sym.st_info); |
| 10070 | |
| 10071 | /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */ |
| 10072 | if (type == STT_GNU_IFUNC) |
| 10073 | type = STT_FUNC; |
| 10074 | |
| 10075 | if (h->ref_regular_nonweak) |
| 10076 | bindtype = STB_GLOBAL; |
| 10077 | else |
| 10078 | bindtype = STB_WEAK; |
| 10079 | sym.st_info = ELF_ST_INFO (bindtype, type); |
| 10080 | } |
| 10081 | |
| 10082 | /* If this is a symbol defined in a dynamic library, don't use the |
| 10083 | symbol size from the dynamic library. Relinking an executable |
| 10084 | against a new library may introduce gratuitous changes in the |
| 10085 | executable's symbols if we keep the size. */ |
| 10086 | if (sym.st_shndx == SHN_UNDEF |
| 10087 | && !h->def_regular |
| 10088 | && h->def_dynamic) |
| 10089 | sym.st_size = 0; |
| 10090 | |
| 10091 | /* If a non-weak symbol with non-default visibility is not defined |
| 10092 | locally, it is a fatal error. */ |
| 10093 | if (!bfd_link_relocatable (flinfo->info) |
| 10094 | && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT |
| 10095 | && ELF_ST_BIND (sym.st_info) != STB_WEAK |
| 10096 | && h->root.type == bfd_link_hash_undefined |
| 10097 | && !h->def_regular) |
| 10098 | { |
| 10099 | const char *msg; |
| 10100 | |
| 10101 | if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED) |
| 10102 | /* xgettext:c-format */ |
| 10103 | msg = _("%pB: protected symbol `%s' isn't defined"); |
| 10104 | else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL) |
| 10105 | /* xgettext:c-format */ |
| 10106 | msg = _("%pB: internal symbol `%s' isn't defined"); |
| 10107 | else |
| 10108 | /* xgettext:c-format */ |
| 10109 | msg = _("%pB: hidden symbol `%s' isn't defined"); |
| 10110 | _bfd_error_handler (msg, flinfo->output_bfd, h->root.root.string); |
| 10111 | bfd_set_error (bfd_error_bad_value); |
| 10112 | eoinfo->failed = TRUE; |
| 10113 | return FALSE; |
| 10114 | } |
| 10115 | |
| 10116 | /* If this symbol should be put in the .dynsym section, then put it |
| 10117 | there now. We already know the symbol index. We also fill in |
| 10118 | the entry in the .hash section. */ |
| 10119 | if (h->dynindx != -1 |
| 10120 | && elf_hash_table (flinfo->info)->dynamic_sections_created |
| 10121 | && elf_hash_table (flinfo->info)->dynsym != NULL |
| 10122 | && !discarded_section (elf_hash_table (flinfo->info)->dynsym)) |
| 10123 | { |
| 10124 | bfd_byte *esym; |
| 10125 | |
| 10126 | /* Since there is no version information in the dynamic string, |
| 10127 | if there is no version info in symbol version section, we will |
| 10128 | have a run-time problem if not linking executable, referenced |
| 10129 | by shared library, or not bound locally. */ |
| 10130 | if (h->verinfo.verdef == NULL |
| 10131 | && (!bfd_link_executable (flinfo->info) |
| 10132 | || h->ref_dynamic |
| 10133 | || !h->def_regular)) |
| 10134 | { |
| 10135 | char *p = strrchr (h->root.root.string, ELF_VER_CHR); |
| 10136 | |
| 10137 | if (p && p [1] != '\0') |
| 10138 | { |
| 10139 | _bfd_error_handler |
| 10140 | /* xgettext:c-format */ |
| 10141 | (_("%pB: no symbol version section for versioned symbol `%s'"), |
| 10142 | flinfo->output_bfd, h->root.root.string); |
| 10143 | eoinfo->failed = TRUE; |
| 10144 | return FALSE; |
| 10145 | } |
| 10146 | } |
| 10147 | |
| 10148 | sym.st_name = h->dynstr_index; |
| 10149 | esym = (elf_hash_table (flinfo->info)->dynsym->contents |
| 10150 | + h->dynindx * bed->s->sizeof_sym); |
| 10151 | if (!check_dynsym (flinfo->output_bfd, &sym)) |
| 10152 | { |
| 10153 | eoinfo->failed = TRUE; |
| 10154 | return FALSE; |
| 10155 | } |
| 10156 | bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0); |
| 10157 | |
| 10158 | if (flinfo->hash_sec != NULL) |
| 10159 | { |
| 10160 | size_t hash_entry_size; |
| 10161 | bfd_byte *bucketpos; |
| 10162 | bfd_vma chain; |
| 10163 | size_t bucketcount; |
| 10164 | size_t bucket; |
| 10165 | |
| 10166 | bucketcount = elf_hash_table (flinfo->info)->bucketcount; |
| 10167 | bucket = h->u.elf_hash_value % bucketcount; |
| 10168 | |
| 10169 | hash_entry_size |
| 10170 | = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize; |
| 10171 | bucketpos = ((bfd_byte *) flinfo->hash_sec->contents |
| 10172 | + (bucket + 2) * hash_entry_size); |
| 10173 | chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos); |
| 10174 | bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx, |
| 10175 | bucketpos); |
| 10176 | bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain, |
| 10177 | ((bfd_byte *) flinfo->hash_sec->contents |
| 10178 | + (bucketcount + 2 + h->dynindx) * hash_entry_size)); |
| 10179 | } |
| 10180 | |
| 10181 | if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL) |
| 10182 | { |
| 10183 | Elf_Internal_Versym iversym; |
| 10184 | Elf_External_Versym *eversym; |
| 10185 | |
| 10186 | if (!h->def_regular) |
| 10187 | { |
| 10188 | if (h->verinfo.verdef == NULL |
| 10189 | || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd) |
| 10190 | & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED))) |
| 10191 | iversym.vs_vers = 0; |
| 10192 | else |
| 10193 | iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1; |
| 10194 | } |
| 10195 | else |
| 10196 | { |
| 10197 | if (h->verinfo.vertree == NULL) |
| 10198 | iversym.vs_vers = 1; |
| 10199 | else |
| 10200 | iversym.vs_vers = h->verinfo.vertree->vernum + 1; |
| 10201 | if (flinfo->info->create_default_symver) |
| 10202 | iversym.vs_vers++; |
| 10203 | } |
| 10204 | |
| 10205 | /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is |
| 10206 | defined locally. */ |
| 10207 | if (h->versioned == versioned_hidden && h->def_regular) |
| 10208 | iversym.vs_vers |= VERSYM_HIDDEN; |
| 10209 | |
| 10210 | eversym = (Elf_External_Versym *) flinfo->symver_sec->contents; |
| 10211 | eversym += h->dynindx; |
| 10212 | _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym); |
| 10213 | } |
| 10214 | } |
| 10215 | |
| 10216 | /* If the symbol is undefined, and we didn't output it to .dynsym, |
| 10217 | strip it from .symtab too. Obviously we can't do this for |
| 10218 | relocatable output or when needed for --emit-relocs. */ |
| 10219 | else if (input_sec == bfd_und_section_ptr |
| 10220 | && h->indx != -2 |
| 10221 | /* PR 22319 Do not strip global undefined symbols marked as being needed. */ |
| 10222 | && (h->mark != 1 || ELF_ST_BIND (sym.st_info) != STB_GLOBAL) |
| 10223 | && !bfd_link_relocatable (flinfo->info)) |
| 10224 | return TRUE; |
| 10225 | |
| 10226 | /* Also strip others that we couldn't earlier due to dynamic symbol |
| 10227 | processing. */ |
| 10228 | if (strip) |
| 10229 | return TRUE; |
| 10230 | if ((input_sec->flags & SEC_EXCLUDE) != 0) |
| 10231 | return TRUE; |
| 10232 | |
| 10233 | /* Output a FILE symbol so that following locals are not associated |
| 10234 | with the wrong input file. We need one for forced local symbols |
| 10235 | if we've seen more than one FILE symbol or when we have exactly |
| 10236 | one FILE symbol but global symbols are present in a file other |
| 10237 | than the one with the FILE symbol. We also need one if linker |
| 10238 | defined symbols are present. In practice these conditions are |
| 10239 | always met, so just emit the FILE symbol unconditionally. */ |
| 10240 | if (eoinfo->localsyms |
| 10241 | && !eoinfo->file_sym_done |
| 10242 | && eoinfo->flinfo->filesym_count != 0) |
| 10243 | { |
| 10244 | Elf_Internal_Sym fsym; |
| 10245 | |
| 10246 | memset (&fsym, 0, sizeof (fsym)); |
| 10247 | fsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE); |
| 10248 | fsym.st_shndx = SHN_ABS; |
| 10249 | if (!elf_link_output_symstrtab (eoinfo->flinfo, NULL, &fsym, |
| 10250 | bfd_und_section_ptr, NULL)) |
| 10251 | return FALSE; |
| 10252 | |
| 10253 | eoinfo->file_sym_done = TRUE; |
| 10254 | } |
| 10255 | |
| 10256 | indx = bfd_get_symcount (flinfo->output_bfd); |
| 10257 | ret = elf_link_output_symstrtab (flinfo, h->root.root.string, &sym, |
| 10258 | input_sec, h); |
| 10259 | if (ret == 0) |
| 10260 | { |
| 10261 | eoinfo->failed = TRUE; |
| 10262 | return FALSE; |
| 10263 | } |
| 10264 | else if (ret == 1) |
| 10265 | h->indx = indx; |
| 10266 | else if (h->indx == -2) |
| 10267 | abort(); |
| 10268 | |
| 10269 | return TRUE; |
| 10270 | } |
| 10271 | |
| 10272 | /* Return TRUE if special handling is done for relocs in SEC against |
| 10273 | symbols defined in discarded sections. */ |
| 10274 | |
| 10275 | static bfd_boolean |
| 10276 | elf_section_ignore_discarded_relocs (asection *sec) |
| 10277 | { |
| 10278 | const struct elf_backend_data *bed; |
| 10279 | |
| 10280 | switch (sec->sec_info_type) |
| 10281 | { |
| 10282 | case SEC_INFO_TYPE_STABS: |
| 10283 | case SEC_INFO_TYPE_EH_FRAME: |
| 10284 | case SEC_INFO_TYPE_EH_FRAME_ENTRY: |
| 10285 | return TRUE; |
| 10286 | default: |
| 10287 | break; |
| 10288 | } |
| 10289 | |
| 10290 | bed = get_elf_backend_data (sec->owner); |
| 10291 | if (bed->elf_backend_ignore_discarded_relocs != NULL |
| 10292 | && (*bed->elf_backend_ignore_discarded_relocs) (sec)) |
| 10293 | return TRUE; |
| 10294 | |
| 10295 | return FALSE; |
| 10296 | } |
| 10297 | |
| 10298 | /* Return a mask saying how ld should treat relocations in SEC against |
| 10299 | symbols defined in discarded sections. If this function returns |
| 10300 | COMPLAIN set, ld will issue a warning message. If this function |
| 10301 | returns PRETEND set, and the discarded section was link-once and the |
| 10302 | same size as the kept link-once section, ld will pretend that the |
| 10303 | symbol was actually defined in the kept section. Otherwise ld will |
| 10304 | zero the reloc (at least that is the intent, but some cooperation by |
| 10305 | the target dependent code is needed, particularly for REL targets). */ |
| 10306 | |
| 10307 | unsigned int |
| 10308 | _bfd_elf_default_action_discarded (asection *sec) |
| 10309 | { |
| 10310 | if (sec->flags & SEC_DEBUGGING) |
| 10311 | return PRETEND; |
| 10312 | |
| 10313 | if (strcmp (".eh_frame", sec->name) == 0) |
| 10314 | return 0; |
| 10315 | |
| 10316 | if (strcmp (".gcc_except_table", sec->name) == 0) |
| 10317 | return 0; |
| 10318 | |
| 10319 | return COMPLAIN | PRETEND; |
| 10320 | } |
| 10321 | |
| 10322 | /* Find a match between a section and a member of a section group. */ |
| 10323 | |
| 10324 | static asection * |
| 10325 | match_group_member (asection *sec, asection *group, |
| 10326 | struct bfd_link_info *info) |
| 10327 | { |
| 10328 | asection *first = elf_next_in_group (group); |
| 10329 | asection *s = first; |
| 10330 | |
| 10331 | while (s != NULL) |
| 10332 | { |
| 10333 | if (bfd_elf_match_symbols_in_sections (s, sec, info)) |
| 10334 | return s; |
| 10335 | |
| 10336 | s = elf_next_in_group (s); |
| 10337 | if (s == first) |
| 10338 | break; |
| 10339 | } |
| 10340 | |
| 10341 | return NULL; |
| 10342 | } |
| 10343 | |
| 10344 | /* Check if the kept section of a discarded section SEC can be used |
| 10345 | to replace it. Return the replacement if it is OK. Otherwise return |
| 10346 | NULL. */ |
| 10347 | |
| 10348 | asection * |
| 10349 | _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info) |
| 10350 | { |
| 10351 | asection *kept; |
| 10352 | |
| 10353 | kept = sec->kept_section; |
| 10354 | if (kept != NULL) |
| 10355 | { |
| 10356 | if ((kept->flags & SEC_GROUP) != 0) |
| 10357 | kept = match_group_member (sec, kept, info); |
| 10358 | if (kept != NULL |
| 10359 | && ((sec->rawsize != 0 ? sec->rawsize : sec->size) |
| 10360 | != (kept->rawsize != 0 ? kept->rawsize : kept->size))) |
| 10361 | kept = NULL; |
| 10362 | sec->kept_section = kept; |
| 10363 | } |
| 10364 | return kept; |
| 10365 | } |
| 10366 | |
| 10367 | /* Link an input file into the linker output file. This function |
| 10368 | handles all the sections and relocations of the input file at once. |
| 10369 | This is so that we only have to read the local symbols once, and |
| 10370 | don't have to keep them in memory. */ |
| 10371 | |
| 10372 | static bfd_boolean |
| 10373 | elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd) |
| 10374 | { |
| 10375 | int (*relocate_section) |
| 10376 | (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 10377 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **); |
| 10378 | bfd *output_bfd; |
| 10379 | Elf_Internal_Shdr *symtab_hdr; |
| 10380 | size_t locsymcount; |
| 10381 | size_t extsymoff; |
| 10382 | Elf_Internal_Sym *isymbuf; |
| 10383 | Elf_Internal_Sym *isym; |
| 10384 | Elf_Internal_Sym *isymend; |
| 10385 | long *pindex; |
| 10386 | asection **ppsection; |
| 10387 | asection *o; |
| 10388 | const struct elf_backend_data *bed; |
| 10389 | struct elf_link_hash_entry **sym_hashes; |
| 10390 | bfd_size_type address_size; |
| 10391 | bfd_vma r_type_mask; |
| 10392 | int r_sym_shift; |
| 10393 | bfd_boolean have_file_sym = FALSE; |
| 10394 | |
| 10395 | output_bfd = flinfo->output_bfd; |
| 10396 | bed = get_elf_backend_data (output_bfd); |
| 10397 | relocate_section = bed->elf_backend_relocate_section; |
| 10398 | |
| 10399 | /* If this is a dynamic object, we don't want to do anything here: |
| 10400 | we don't want the local symbols, and we don't want the section |
| 10401 | contents. */ |
| 10402 | if ((input_bfd->flags & DYNAMIC) != 0) |
| 10403 | return TRUE; |
| 10404 | |
| 10405 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 10406 | if (elf_bad_symtab (input_bfd)) |
| 10407 | { |
| 10408 | locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym; |
| 10409 | extsymoff = 0; |
| 10410 | } |
| 10411 | else |
| 10412 | { |
| 10413 | locsymcount = symtab_hdr->sh_info; |
| 10414 | extsymoff = symtab_hdr->sh_info; |
| 10415 | } |
| 10416 | |
| 10417 | /* Read the local symbols. */ |
| 10418 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 10419 | if (isymbuf == NULL && locsymcount != 0) |
| 10420 | { |
| 10421 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0, |
| 10422 | flinfo->internal_syms, |
| 10423 | flinfo->external_syms, |
| 10424 | flinfo->locsym_shndx); |
| 10425 | if (isymbuf == NULL) |
| 10426 | return FALSE; |
| 10427 | } |
| 10428 | |
| 10429 | /* Find local symbol sections and adjust values of symbols in |
| 10430 | SEC_MERGE sections. Write out those local symbols we know are |
| 10431 | going into the output file. */ |
| 10432 | isymend = isymbuf + locsymcount; |
| 10433 | for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections; |
| 10434 | isym < isymend; |
| 10435 | isym++, pindex++, ppsection++) |
| 10436 | { |
| 10437 | asection *isec; |
| 10438 | const char *name; |
| 10439 | Elf_Internal_Sym osym; |
| 10440 | long indx; |
| 10441 | int ret; |
| 10442 | |
| 10443 | *pindex = -1; |
| 10444 | |
| 10445 | if (elf_bad_symtab (input_bfd)) |
| 10446 | { |
| 10447 | if (ELF_ST_BIND (isym->st_info) != STB_LOCAL) |
| 10448 | { |
| 10449 | *ppsection = NULL; |
| 10450 | continue; |
| 10451 | } |
| 10452 | } |
| 10453 | |
| 10454 | if (isym->st_shndx == SHN_UNDEF) |
| 10455 | isec = bfd_und_section_ptr; |
| 10456 | else if (isym->st_shndx == SHN_ABS) |
| 10457 | isec = bfd_abs_section_ptr; |
| 10458 | else if (isym->st_shndx == SHN_COMMON) |
| 10459 | isec = bfd_com_section_ptr; |
| 10460 | else |
| 10461 | { |
| 10462 | isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); |
| 10463 | if (isec == NULL) |
| 10464 | { |
| 10465 | /* Don't attempt to output symbols with st_shnx in the |
| 10466 | reserved range other than SHN_ABS and SHN_COMMON. */ |
| 10467 | isec = bfd_und_section_ptr; |
| 10468 | } |
| 10469 | else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE |
| 10470 | && ELF_ST_TYPE (isym->st_info) != STT_SECTION) |
| 10471 | isym->st_value = |
| 10472 | _bfd_merged_section_offset (output_bfd, &isec, |
| 10473 | elf_section_data (isec)->sec_info, |
| 10474 | isym->st_value); |
| 10475 | } |
| 10476 | |
| 10477 | *ppsection = isec; |
| 10478 | |
| 10479 | /* Don't output the first, undefined, symbol. In fact, don't |
| 10480 | output any undefined local symbol. */ |
| 10481 | if (isec == bfd_und_section_ptr) |
| 10482 | continue; |
| 10483 | |
| 10484 | if (ELF_ST_TYPE (isym->st_info) == STT_SECTION) |
| 10485 | { |
| 10486 | /* We never output section symbols. Instead, we use the |
| 10487 | section symbol of the corresponding section in the output |
| 10488 | file. */ |
| 10489 | continue; |
| 10490 | } |
| 10491 | |
| 10492 | /* If we are stripping all symbols, we don't want to output this |
| 10493 | one. */ |
| 10494 | if (flinfo->info->strip == strip_all) |
| 10495 | continue; |
| 10496 | |
| 10497 | /* If we are discarding all local symbols, we don't want to |
| 10498 | output this one. If we are generating a relocatable output |
| 10499 | file, then some of the local symbols may be required by |
| 10500 | relocs; we output them below as we discover that they are |
| 10501 | needed. */ |
| 10502 | if (flinfo->info->discard == discard_all) |
| 10503 | continue; |
| 10504 | |
| 10505 | /* If this symbol is defined in a section which we are |
| 10506 | discarding, we don't need to keep it. */ |
| 10507 | if (isym->st_shndx != SHN_UNDEF |
| 10508 | && isym->st_shndx < SHN_LORESERVE |
| 10509 | && bfd_section_removed_from_list (output_bfd, |
| 10510 | isec->output_section)) |
| 10511 | continue; |
| 10512 | |
| 10513 | /* Get the name of the symbol. */ |
| 10514 | name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, |
| 10515 | isym->st_name); |
| 10516 | if (name == NULL) |
| 10517 | return FALSE; |
| 10518 | |
| 10519 | /* See if we are discarding symbols with this name. */ |
| 10520 | if ((flinfo->info->strip == strip_some |
| 10521 | && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE) |
| 10522 | == NULL)) |
| 10523 | || (((flinfo->info->discard == discard_sec_merge |
| 10524 | && (isec->flags & SEC_MERGE) |
| 10525 | && !bfd_link_relocatable (flinfo->info)) |
| 10526 | || flinfo->info->discard == discard_l) |
| 10527 | && bfd_is_local_label_name (input_bfd, name))) |
| 10528 | continue; |
| 10529 | |
| 10530 | if (ELF_ST_TYPE (isym->st_info) == STT_FILE) |
| 10531 | { |
| 10532 | if (input_bfd->lto_output) |
| 10533 | /* -flto puts a temp file name here. This means builds |
| 10534 | are not reproducible. Discard the symbol. */ |
| 10535 | continue; |
| 10536 | have_file_sym = TRUE; |
| 10537 | flinfo->filesym_count += 1; |
| 10538 | } |
| 10539 | if (!have_file_sym) |
| 10540 | { |
| 10541 | /* In the absence of debug info, bfd_find_nearest_line uses |
| 10542 | FILE symbols to determine the source file for local |
| 10543 | function symbols. Provide a FILE symbol here if input |
| 10544 | files lack such, so that their symbols won't be |
| 10545 | associated with a previous input file. It's not the |
| 10546 | source file, but the best we can do. */ |
| 10547 | have_file_sym = TRUE; |
| 10548 | flinfo->filesym_count += 1; |
| 10549 | memset (&osym, 0, sizeof (osym)); |
| 10550 | osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE); |
| 10551 | osym.st_shndx = SHN_ABS; |
| 10552 | if (!elf_link_output_symstrtab (flinfo, |
| 10553 | (input_bfd->lto_output ? NULL |
| 10554 | : input_bfd->filename), |
| 10555 | &osym, bfd_abs_section_ptr, |
| 10556 | NULL)) |
| 10557 | return FALSE; |
| 10558 | } |
| 10559 | |
| 10560 | osym = *isym; |
| 10561 | |
| 10562 | /* Adjust the section index for the output file. */ |
| 10563 | osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd, |
| 10564 | isec->output_section); |
| 10565 | if (osym.st_shndx == SHN_BAD) |
| 10566 | return FALSE; |
| 10567 | |
| 10568 | /* ELF symbols in relocatable files are section relative, but |
| 10569 | in executable files they are virtual addresses. Note that |
| 10570 | this code assumes that all ELF sections have an associated |
| 10571 | BFD section with a reasonable value for output_offset; below |
| 10572 | we assume that they also have a reasonable value for |
| 10573 | output_section. Any special sections must be set up to meet |
| 10574 | these requirements. */ |
| 10575 | osym.st_value += isec->output_offset; |
| 10576 | if (!bfd_link_relocatable (flinfo->info)) |
| 10577 | { |
| 10578 | osym.st_value += isec->output_section->vma; |
| 10579 | if (ELF_ST_TYPE (osym.st_info) == STT_TLS) |
| 10580 | { |
| 10581 | /* STT_TLS symbols are relative to PT_TLS segment base. */ |
| 10582 | if (elf_hash_table (flinfo->info)->tls_sec != NULL) |
| 10583 | osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma; |
| 10584 | else |
| 10585 | osym.st_info = ELF_ST_INFO (ELF_ST_BIND (osym.st_info), |
| 10586 | STT_NOTYPE); |
| 10587 | } |
| 10588 | } |
| 10589 | |
| 10590 | indx = bfd_get_symcount (output_bfd); |
| 10591 | ret = elf_link_output_symstrtab (flinfo, name, &osym, isec, NULL); |
| 10592 | if (ret == 0) |
| 10593 | return FALSE; |
| 10594 | else if (ret == 1) |
| 10595 | *pindex = indx; |
| 10596 | } |
| 10597 | |
| 10598 | if (bed->s->arch_size == 32) |
| 10599 | { |
| 10600 | r_type_mask = 0xff; |
| 10601 | r_sym_shift = 8; |
| 10602 | address_size = 4; |
| 10603 | } |
| 10604 | else |
| 10605 | { |
| 10606 | r_type_mask = 0xffffffff; |
| 10607 | r_sym_shift = 32; |
| 10608 | address_size = 8; |
| 10609 | } |
| 10610 | |
| 10611 | /* Relocate the contents of each section. */ |
| 10612 | sym_hashes = elf_sym_hashes (input_bfd); |
| 10613 | for (o = input_bfd->sections; o != NULL; o = o->next) |
| 10614 | { |
| 10615 | bfd_byte *contents; |
| 10616 | |
| 10617 | if (! o->linker_mark) |
| 10618 | { |
| 10619 | /* This section was omitted from the link. */ |
| 10620 | continue; |
| 10621 | } |
| 10622 | |
| 10623 | if (!flinfo->info->resolve_section_groups |
| 10624 | && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP) |
| 10625 | { |
| 10626 | /* Deal with the group signature symbol. */ |
| 10627 | struct bfd_elf_section_data *sec_data = elf_section_data (o); |
| 10628 | unsigned long symndx = sec_data->this_hdr.sh_info; |
| 10629 | asection *osec = o->output_section; |
| 10630 | |
| 10631 | BFD_ASSERT (bfd_link_relocatable (flinfo->info)); |
| 10632 | if (symndx >= locsymcount |
| 10633 | || (elf_bad_symtab (input_bfd) |
| 10634 | && flinfo->sections[symndx] == NULL)) |
| 10635 | { |
| 10636 | struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff]; |
| 10637 | while (h->root.type == bfd_link_hash_indirect |
| 10638 | || h->root.type == bfd_link_hash_warning) |
| 10639 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 10640 | /* Arrange for symbol to be output. */ |
| 10641 | h->indx = -2; |
| 10642 | elf_section_data (osec)->this_hdr.sh_info = -2; |
| 10643 | } |
| 10644 | else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION) |
| 10645 | { |
| 10646 | /* We'll use the output section target_index. */ |
| 10647 | asection *sec = flinfo->sections[symndx]->output_section; |
| 10648 | elf_section_data (osec)->this_hdr.sh_info = sec->target_index; |
| 10649 | } |
| 10650 | else |
| 10651 | { |
| 10652 | if (flinfo->indices[symndx] == -1) |
| 10653 | { |
| 10654 | /* Otherwise output the local symbol now. */ |
| 10655 | Elf_Internal_Sym sym = isymbuf[symndx]; |
| 10656 | asection *sec = flinfo->sections[symndx]->output_section; |
| 10657 | const char *name; |
| 10658 | long indx; |
| 10659 | int ret; |
| 10660 | |
| 10661 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 10662 | symtab_hdr->sh_link, |
| 10663 | sym.st_name); |
| 10664 | if (name == NULL) |
| 10665 | return FALSE; |
| 10666 | |
| 10667 | sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd, |
| 10668 | sec); |
| 10669 | if (sym.st_shndx == SHN_BAD) |
| 10670 | return FALSE; |
| 10671 | |
| 10672 | sym.st_value += o->output_offset; |
| 10673 | |
| 10674 | indx = bfd_get_symcount (output_bfd); |
| 10675 | ret = elf_link_output_symstrtab (flinfo, name, &sym, o, |
| 10676 | NULL); |
| 10677 | if (ret == 0) |
| 10678 | return FALSE; |
| 10679 | else if (ret == 1) |
| 10680 | flinfo->indices[symndx] = indx; |
| 10681 | else |
| 10682 | abort (); |
| 10683 | } |
| 10684 | elf_section_data (osec)->this_hdr.sh_info |
| 10685 | = flinfo->indices[symndx]; |
| 10686 | } |
| 10687 | } |
| 10688 | |
| 10689 | if ((o->flags & SEC_HAS_CONTENTS) == 0 |
| 10690 | || (o->size == 0 && (o->flags & SEC_RELOC) == 0)) |
| 10691 | continue; |
| 10692 | |
| 10693 | if ((o->flags & SEC_LINKER_CREATED) != 0) |
| 10694 | { |
| 10695 | /* Section was created by _bfd_elf_link_create_dynamic_sections |
| 10696 | or somesuch. */ |
| 10697 | continue; |
| 10698 | } |
| 10699 | |
| 10700 | /* Get the contents of the section. They have been cached by a |
| 10701 | relaxation routine. Note that o is a section in an input |
| 10702 | file, so the contents field will not have been set by any of |
| 10703 | the routines which work on output files. */ |
| 10704 | if (elf_section_data (o)->this_hdr.contents != NULL) |
| 10705 | { |
| 10706 | contents = elf_section_data (o)->this_hdr.contents; |
| 10707 | if (bed->caches_rawsize |
| 10708 | && o->rawsize != 0 |
| 10709 | && o->rawsize < o->size) |
| 10710 | { |
| 10711 | memcpy (flinfo->contents, contents, o->rawsize); |
| 10712 | contents = flinfo->contents; |
| 10713 | } |
| 10714 | } |
| 10715 | else |
| 10716 | { |
| 10717 | contents = flinfo->contents; |
| 10718 | if (! bfd_get_full_section_contents (input_bfd, o, &contents)) |
| 10719 | return FALSE; |
| 10720 | } |
| 10721 | |
| 10722 | if ((o->flags & SEC_RELOC) != 0) |
| 10723 | { |
| 10724 | Elf_Internal_Rela *internal_relocs; |
| 10725 | Elf_Internal_Rela *rel, *relend; |
| 10726 | int action_discarded; |
| 10727 | int ret; |
| 10728 | |
| 10729 | /* Get the swapped relocs. */ |
| 10730 | internal_relocs |
| 10731 | = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs, |
| 10732 | flinfo->internal_relocs, FALSE); |
| 10733 | if (internal_relocs == NULL |
| 10734 | && o->reloc_count > 0) |
| 10735 | return FALSE; |
| 10736 | |
| 10737 | /* We need to reverse-copy input .ctors/.dtors sections if |
| 10738 | they are placed in .init_array/.finit_array for output. */ |
| 10739 | if (o->size > address_size |
| 10740 | && ((strncmp (o->name, ".ctors", 6) == 0 |
| 10741 | && strcmp (o->output_section->name, |
| 10742 | ".init_array") == 0) |
| 10743 | || (strncmp (o->name, ".dtors", 6) == 0 |
| 10744 | && strcmp (o->output_section->name, |
| 10745 | ".fini_array") == 0)) |
| 10746 | && (o->name[6] == 0 || o->name[6] == '.')) |
| 10747 | { |
| 10748 | if (o->size * bed->s->int_rels_per_ext_rel |
| 10749 | != o->reloc_count * address_size) |
| 10750 | { |
| 10751 | _bfd_error_handler |
| 10752 | /* xgettext:c-format */ |
| 10753 | (_("error: %pB: size of section %pA is not " |
| 10754 | "multiple of address size"), |
| 10755 | input_bfd, o); |
| 10756 | bfd_set_error (bfd_error_bad_value); |
| 10757 | return FALSE; |
| 10758 | } |
| 10759 | o->flags |= SEC_ELF_REVERSE_COPY; |
| 10760 | } |
| 10761 | |
| 10762 | action_discarded = -1; |
| 10763 | if (!elf_section_ignore_discarded_relocs (o)) |
| 10764 | action_discarded = (*bed->action_discarded) (o); |
| 10765 | |
| 10766 | /* Run through the relocs evaluating complex reloc symbols and |
| 10767 | looking for relocs against symbols from discarded sections |
| 10768 | or section symbols from removed link-once sections. |
| 10769 | Complain about relocs against discarded sections. Zero |
| 10770 | relocs against removed link-once sections. */ |
| 10771 | |
| 10772 | rel = internal_relocs; |
| 10773 | relend = rel + o->reloc_count; |
| 10774 | for ( ; rel < relend; rel++) |
| 10775 | { |
| 10776 | unsigned long r_symndx = rel->r_info >> r_sym_shift; |
| 10777 | unsigned int s_type; |
| 10778 | asection **ps, *sec; |
| 10779 | struct elf_link_hash_entry *h = NULL; |
| 10780 | const char *sym_name; |
| 10781 | |
| 10782 | if (r_symndx == STN_UNDEF) |
| 10783 | continue; |
| 10784 | |
| 10785 | if (r_symndx >= locsymcount |
| 10786 | || (elf_bad_symtab (input_bfd) |
| 10787 | && flinfo->sections[r_symndx] == NULL)) |
| 10788 | { |
| 10789 | h = sym_hashes[r_symndx - extsymoff]; |
| 10790 | |
| 10791 | /* Badly formatted input files can contain relocs that |
| 10792 | reference non-existant symbols. Check here so that |
| 10793 | we do not seg fault. */ |
| 10794 | if (h == NULL) |
| 10795 | { |
| 10796 | _bfd_error_handler |
| 10797 | /* xgettext:c-format */ |
| 10798 | (_("error: %pB contains a reloc (%#" PRIx64 ") for section %pA " |
| 10799 | "that references a non-existent global symbol"), |
| 10800 | input_bfd, (uint64_t) rel->r_info, o); |
| 10801 | bfd_set_error (bfd_error_bad_value); |
| 10802 | return FALSE; |
| 10803 | } |
| 10804 | |
| 10805 | while (h->root.type == bfd_link_hash_indirect |
| 10806 | || h->root.type == bfd_link_hash_warning) |
| 10807 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 10808 | |
| 10809 | s_type = h->type; |
| 10810 | |
| 10811 | /* If a plugin symbol is referenced from a non-IR file, |
| 10812 | mark the symbol as undefined. Note that the |
| 10813 | linker may attach linker created dynamic sections |
| 10814 | to the plugin bfd. Symbols defined in linker |
| 10815 | created sections are not plugin symbols. */ |
| 10816 | if ((h->root.non_ir_ref_regular |
| 10817 | || h->root.non_ir_ref_dynamic) |
| 10818 | && (h->root.type == bfd_link_hash_defined |
| 10819 | || h->root.type == bfd_link_hash_defweak) |
| 10820 | && (h->root.u.def.section->flags |
| 10821 | & SEC_LINKER_CREATED) == 0 |
| 10822 | && h->root.u.def.section->owner != NULL |
| 10823 | && (h->root.u.def.section->owner->flags |
| 10824 | & BFD_PLUGIN) != 0) |
| 10825 | { |
| 10826 | h->root.type = bfd_link_hash_undefined; |
| 10827 | h->root.u.undef.abfd = h->root.u.def.section->owner; |
| 10828 | } |
| 10829 | |
| 10830 | ps = NULL; |
| 10831 | if (h->root.type == bfd_link_hash_defined |
| 10832 | || h->root.type == bfd_link_hash_defweak) |
| 10833 | ps = &h->root.u.def.section; |
| 10834 | |
| 10835 | sym_name = h->root.root.string; |
| 10836 | } |
| 10837 | else |
| 10838 | { |
| 10839 | Elf_Internal_Sym *sym = isymbuf + r_symndx; |
| 10840 | |
| 10841 | s_type = ELF_ST_TYPE (sym->st_info); |
| 10842 | ps = &flinfo->sections[r_symndx]; |
| 10843 | sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr, |
| 10844 | sym, *ps); |
| 10845 | } |
| 10846 | |
| 10847 | if ((s_type == STT_RELC || s_type == STT_SRELC) |
| 10848 | && !bfd_link_relocatable (flinfo->info)) |
| 10849 | { |
| 10850 | bfd_vma val; |
| 10851 | bfd_vma dot = (rel->r_offset |
| 10852 | + o->output_offset + o->output_section->vma); |
| 10853 | #ifdef DEBUG |
| 10854 | printf ("Encountered a complex symbol!"); |
| 10855 | printf (" (input_bfd %s, section %s, reloc %ld\n", |
| 10856 | input_bfd->filename, o->name, |
| 10857 | (long) (rel - internal_relocs)); |
| 10858 | printf (" symbol: idx %8.8lx, name %s\n", |
| 10859 | r_symndx, sym_name); |
| 10860 | printf (" reloc : info %8.8lx, addr %8.8lx\n", |
| 10861 | (unsigned long) rel->r_info, |
| 10862 | (unsigned long) rel->r_offset); |
| 10863 | #endif |
| 10864 | if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot, |
| 10865 | isymbuf, locsymcount, s_type == STT_SRELC)) |
| 10866 | return FALSE; |
| 10867 | |
| 10868 | /* Symbol evaluated OK. Update to absolute value. */ |
| 10869 | set_symbol_value (input_bfd, isymbuf, locsymcount, |
| 10870 | r_symndx, val); |
| 10871 | continue; |
| 10872 | } |
| 10873 | |
| 10874 | if (action_discarded != -1 && ps != NULL) |
| 10875 | { |
| 10876 | /* Complain if the definition comes from a |
| 10877 | discarded section. */ |
| 10878 | if ((sec = *ps) != NULL && discarded_section (sec)) |
| 10879 | { |
| 10880 | BFD_ASSERT (r_symndx != STN_UNDEF); |
| 10881 | if (action_discarded & COMPLAIN) |
| 10882 | (*flinfo->info->callbacks->einfo) |
| 10883 | /* xgettext:c-format */ |
| 10884 | (_("%X`%s' referenced in section `%pA' of %pB: " |
| 10885 | "defined in discarded section `%pA' of %pB\n"), |
| 10886 | sym_name, o, input_bfd, sec, sec->owner); |
| 10887 | |
| 10888 | /* Try to do the best we can to support buggy old |
| 10889 | versions of gcc. Pretend that the symbol is |
| 10890 | really defined in the kept linkonce section. |
| 10891 | FIXME: This is quite broken. Modifying the |
| 10892 | symbol here means we will be changing all later |
| 10893 | uses of the symbol, not just in this section. */ |
| 10894 | if (action_discarded & PRETEND) |
| 10895 | { |
| 10896 | asection *kept; |
| 10897 | |
| 10898 | kept = _bfd_elf_check_kept_section (sec, |
| 10899 | flinfo->info); |
| 10900 | if (kept != NULL) |
| 10901 | { |
| 10902 | *ps = kept; |
| 10903 | continue; |
| 10904 | } |
| 10905 | } |
| 10906 | } |
| 10907 | } |
| 10908 | } |
| 10909 | |
| 10910 | /* Relocate the section by invoking a back end routine. |
| 10911 | |
| 10912 | The back end routine is responsible for adjusting the |
| 10913 | section contents as necessary, and (if using Rela relocs |
| 10914 | and generating a relocatable output file) adjusting the |
| 10915 | reloc addend as necessary. |
| 10916 | |
| 10917 | The back end routine does not have to worry about setting |
| 10918 | the reloc address or the reloc symbol index. |
| 10919 | |
| 10920 | The back end routine is given a pointer to the swapped in |
| 10921 | internal symbols, and can access the hash table entries |
| 10922 | for the external symbols via elf_sym_hashes (input_bfd). |
| 10923 | |
| 10924 | When generating relocatable output, the back end routine |
| 10925 | must handle STB_LOCAL/STT_SECTION symbols specially. The |
| 10926 | output symbol is going to be a section symbol |
| 10927 | corresponding to the output section, which will require |
| 10928 | the addend to be adjusted. */ |
| 10929 | |
| 10930 | ret = (*relocate_section) (output_bfd, flinfo->info, |
| 10931 | input_bfd, o, contents, |
| 10932 | internal_relocs, |
| 10933 | isymbuf, |
| 10934 | flinfo->sections); |
| 10935 | if (!ret) |
| 10936 | return FALSE; |
| 10937 | |
| 10938 | if (ret == 2 |
| 10939 | || bfd_link_relocatable (flinfo->info) |
| 10940 | || flinfo->info->emitrelocations) |
| 10941 | { |
| 10942 | Elf_Internal_Rela *irela; |
| 10943 | Elf_Internal_Rela *irelaend, *irelamid; |
| 10944 | bfd_vma last_offset; |
| 10945 | struct elf_link_hash_entry **rel_hash; |
| 10946 | struct elf_link_hash_entry **rel_hash_list, **rela_hash_list; |
| 10947 | Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr; |
| 10948 | unsigned int next_erel; |
| 10949 | bfd_boolean rela_normal; |
| 10950 | struct bfd_elf_section_data *esdi, *esdo; |
| 10951 | |
| 10952 | esdi = elf_section_data (o); |
| 10953 | esdo = elf_section_data (o->output_section); |
| 10954 | rela_normal = FALSE; |
| 10955 | |
| 10956 | /* Adjust the reloc addresses and symbol indices. */ |
| 10957 | |
| 10958 | irela = internal_relocs; |
| 10959 | irelaend = irela + o->reloc_count; |
| 10960 | rel_hash = esdo->rel.hashes + esdo->rel.count; |
| 10961 | /* We start processing the REL relocs, if any. When we reach |
| 10962 | IRELAMID in the loop, we switch to the RELA relocs. */ |
| 10963 | irelamid = irela; |
| 10964 | if (esdi->rel.hdr != NULL) |
| 10965 | irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr) |
| 10966 | * bed->s->int_rels_per_ext_rel); |
| 10967 | rel_hash_list = rel_hash; |
| 10968 | rela_hash_list = NULL; |
| 10969 | last_offset = o->output_offset; |
| 10970 | if (!bfd_link_relocatable (flinfo->info)) |
| 10971 | last_offset += o->output_section->vma; |
| 10972 | for (next_erel = 0; irela < irelaend; irela++, next_erel++) |
| 10973 | { |
| 10974 | unsigned long r_symndx; |
| 10975 | asection *sec; |
| 10976 | Elf_Internal_Sym sym; |
| 10977 | |
| 10978 | if (next_erel == bed->s->int_rels_per_ext_rel) |
| 10979 | { |
| 10980 | rel_hash++; |
| 10981 | next_erel = 0; |
| 10982 | } |
| 10983 | |
| 10984 | if (irela == irelamid) |
| 10985 | { |
| 10986 | rel_hash = esdo->rela.hashes + esdo->rela.count; |
| 10987 | rela_hash_list = rel_hash; |
| 10988 | rela_normal = bed->rela_normal; |
| 10989 | } |
| 10990 | |
| 10991 | irela->r_offset = _bfd_elf_section_offset (output_bfd, |
| 10992 | flinfo->info, o, |
| 10993 | irela->r_offset); |
| 10994 | if (irela->r_offset >= (bfd_vma) -2) |
| 10995 | { |
| 10996 | /* This is a reloc for a deleted entry or somesuch. |
| 10997 | Turn it into an R_*_NONE reloc, at the same |
| 10998 | offset as the last reloc. elf_eh_frame.c and |
| 10999 | bfd_elf_discard_info rely on reloc offsets |
| 11000 | being ordered. */ |
| 11001 | irela->r_offset = last_offset; |
| 11002 | irela->r_info = 0; |
| 11003 | irela->r_addend = 0; |
| 11004 | continue; |
| 11005 | } |
| 11006 | |
| 11007 | irela->r_offset += o->output_offset; |
| 11008 | |
| 11009 | /* Relocs in an executable have to be virtual addresses. */ |
| 11010 | if (!bfd_link_relocatable (flinfo->info)) |
| 11011 | irela->r_offset += o->output_section->vma; |
| 11012 | |
| 11013 | last_offset = irela->r_offset; |
| 11014 | |
| 11015 | r_symndx = irela->r_info >> r_sym_shift; |
| 11016 | if (r_symndx == STN_UNDEF) |
| 11017 | continue; |
| 11018 | |
| 11019 | if (r_symndx >= locsymcount |
| 11020 | || (elf_bad_symtab (input_bfd) |
| 11021 | && flinfo->sections[r_symndx] == NULL)) |
| 11022 | { |
| 11023 | struct elf_link_hash_entry *rh; |
| 11024 | unsigned long indx; |
| 11025 | |
| 11026 | /* This is a reloc against a global symbol. We |
| 11027 | have not yet output all the local symbols, so |
| 11028 | we do not know the symbol index of any global |
| 11029 | symbol. We set the rel_hash entry for this |
| 11030 | reloc to point to the global hash table entry |
| 11031 | for this symbol. The symbol index is then |
| 11032 | set at the end of bfd_elf_final_link. */ |
| 11033 | indx = r_symndx - extsymoff; |
| 11034 | rh = elf_sym_hashes (input_bfd)[indx]; |
| 11035 | while (rh->root.type == bfd_link_hash_indirect |
| 11036 | || rh->root.type == bfd_link_hash_warning) |
| 11037 | rh = (struct elf_link_hash_entry *) rh->root.u.i.link; |
| 11038 | |
| 11039 | /* Setting the index to -2 tells |
| 11040 | elf_link_output_extsym that this symbol is |
| 11041 | used by a reloc. */ |
| 11042 | BFD_ASSERT (rh->indx < 0); |
| 11043 | rh->indx = -2; |
| 11044 | *rel_hash = rh; |
| 11045 | |
| 11046 | continue; |
| 11047 | } |
| 11048 | |
| 11049 | /* This is a reloc against a local symbol. */ |
| 11050 | |
| 11051 | *rel_hash = NULL; |
| 11052 | sym = isymbuf[r_symndx]; |
| 11053 | sec = flinfo->sections[r_symndx]; |
| 11054 | if (ELF_ST_TYPE (sym.st_info) == STT_SECTION) |
| 11055 | { |
| 11056 | /* I suppose the backend ought to fill in the |
| 11057 | section of any STT_SECTION symbol against a |
| 11058 | processor specific section. */ |
| 11059 | r_symndx = STN_UNDEF; |
| 11060 | if (bfd_is_abs_section (sec)) |
| 11061 | ; |
| 11062 | else if (sec == NULL || sec->owner == NULL) |
| 11063 | { |
| 11064 | bfd_set_error (bfd_error_bad_value); |
| 11065 | return FALSE; |
| 11066 | } |
| 11067 | else |
| 11068 | { |
| 11069 | asection *osec = sec->output_section; |
| 11070 | |
| 11071 | /* If we have discarded a section, the output |
| 11072 | section will be the absolute section. In |
| 11073 | case of discarded SEC_MERGE sections, use |
| 11074 | the kept section. relocate_section should |
| 11075 | have already handled discarded linkonce |
| 11076 | sections. */ |
| 11077 | if (bfd_is_abs_section (osec) |
| 11078 | && sec->kept_section != NULL |
| 11079 | && sec->kept_section->output_section != NULL) |
| 11080 | { |
| 11081 | osec = sec->kept_section->output_section; |
| 11082 | irela->r_addend -= osec->vma; |
| 11083 | } |
| 11084 | |
| 11085 | if (!bfd_is_abs_section (osec)) |
| 11086 | { |
| 11087 | r_symndx = osec->target_index; |
| 11088 | if (r_symndx == STN_UNDEF) |
| 11089 | { |
| 11090 | irela->r_addend += osec->vma; |
| 11091 | osec = _bfd_nearby_section (output_bfd, osec, |
| 11092 | osec->vma); |
| 11093 | irela->r_addend -= osec->vma; |
| 11094 | r_symndx = osec->target_index; |
| 11095 | } |
| 11096 | } |
| 11097 | } |
| 11098 | |
| 11099 | /* Adjust the addend according to where the |
| 11100 | section winds up in the output section. */ |
| 11101 | if (rela_normal) |
| 11102 | irela->r_addend += sec->output_offset; |
| 11103 | } |
| 11104 | else |
| 11105 | { |
| 11106 | if (flinfo->indices[r_symndx] == -1) |
| 11107 | { |
| 11108 | unsigned long shlink; |
| 11109 | const char *name; |
| 11110 | asection *osec; |
| 11111 | long indx; |
| 11112 | |
| 11113 | if (flinfo->info->strip == strip_all) |
| 11114 | { |
| 11115 | /* You can't do ld -r -s. */ |
| 11116 | bfd_set_error (bfd_error_invalid_operation); |
| 11117 | return FALSE; |
| 11118 | } |
| 11119 | |
| 11120 | /* This symbol was skipped earlier, but |
| 11121 | since it is needed by a reloc, we |
| 11122 | must output it now. */ |
| 11123 | shlink = symtab_hdr->sh_link; |
| 11124 | name = (bfd_elf_string_from_elf_section |
| 11125 | (input_bfd, shlink, sym.st_name)); |
| 11126 | if (name == NULL) |
| 11127 | return FALSE; |
| 11128 | |
| 11129 | osec = sec->output_section; |
| 11130 | sym.st_shndx = |
| 11131 | _bfd_elf_section_from_bfd_section (output_bfd, |
| 11132 | osec); |
| 11133 | if (sym.st_shndx == SHN_BAD) |
| 11134 | return FALSE; |
| 11135 | |
| 11136 | sym.st_value += sec->output_offset; |
| 11137 | if (!bfd_link_relocatable (flinfo->info)) |
| 11138 | { |
| 11139 | sym.st_value += osec->vma; |
| 11140 | if (ELF_ST_TYPE (sym.st_info) == STT_TLS) |
| 11141 | { |
| 11142 | struct elf_link_hash_table *htab |
| 11143 | = elf_hash_table (flinfo->info); |
| 11144 | |
| 11145 | /* STT_TLS symbols are relative to PT_TLS |
| 11146 | segment base. */ |
| 11147 | if (htab->tls_sec != NULL) |
| 11148 | sym.st_value -= htab->tls_sec->vma; |
| 11149 | else |
| 11150 | sym.st_info |
| 11151 | = ELF_ST_INFO (ELF_ST_BIND (sym.st_info), |
| 11152 | STT_NOTYPE); |
| 11153 | } |
| 11154 | } |
| 11155 | |
| 11156 | indx = bfd_get_symcount (output_bfd); |
| 11157 | ret = elf_link_output_symstrtab (flinfo, name, |
| 11158 | &sym, sec, |
| 11159 | NULL); |
| 11160 | if (ret == 0) |
| 11161 | return FALSE; |
| 11162 | else if (ret == 1) |
| 11163 | flinfo->indices[r_symndx] = indx; |
| 11164 | else |
| 11165 | abort (); |
| 11166 | } |
| 11167 | |
| 11168 | r_symndx = flinfo->indices[r_symndx]; |
| 11169 | } |
| 11170 | |
| 11171 | irela->r_info = ((bfd_vma) r_symndx << r_sym_shift |
| 11172 | | (irela->r_info & r_type_mask)); |
| 11173 | } |
| 11174 | |
| 11175 | /* Swap out the relocs. */ |
| 11176 | input_rel_hdr = esdi->rel.hdr; |
| 11177 | if (input_rel_hdr && input_rel_hdr->sh_size != 0) |
| 11178 | { |
| 11179 | if (!bed->elf_backend_emit_relocs (output_bfd, o, |
| 11180 | input_rel_hdr, |
| 11181 | internal_relocs, |
| 11182 | rel_hash_list)) |
| 11183 | return FALSE; |
| 11184 | internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr) |
| 11185 | * bed->s->int_rels_per_ext_rel); |
| 11186 | rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr); |
| 11187 | } |
| 11188 | |
| 11189 | input_rela_hdr = esdi->rela.hdr; |
| 11190 | if (input_rela_hdr && input_rela_hdr->sh_size != 0) |
| 11191 | { |
| 11192 | if (!bed->elf_backend_emit_relocs (output_bfd, o, |
| 11193 | input_rela_hdr, |
| 11194 | internal_relocs, |
| 11195 | rela_hash_list)) |
| 11196 | return FALSE; |
| 11197 | } |
| 11198 | } |
| 11199 | } |
| 11200 | |
| 11201 | /* Write out the modified section contents. */ |
| 11202 | if (bed->elf_backend_write_section |
| 11203 | && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o, |
| 11204 | contents)) |
| 11205 | { |
| 11206 | /* Section written out. */ |
| 11207 | } |
| 11208 | else switch (o->sec_info_type) |
| 11209 | { |
| 11210 | case SEC_INFO_TYPE_STABS: |
| 11211 | if (! (_bfd_write_section_stabs |
| 11212 | (output_bfd, |
| 11213 | &elf_hash_table (flinfo->info)->stab_info, |
| 11214 | o, &elf_section_data (o)->sec_info, contents))) |
| 11215 | return FALSE; |
| 11216 | break; |
| 11217 | case SEC_INFO_TYPE_MERGE: |
| 11218 | if (! _bfd_write_merged_section (output_bfd, o, |
| 11219 | elf_section_data (o)->sec_info)) |
| 11220 | return FALSE; |
| 11221 | break; |
| 11222 | case SEC_INFO_TYPE_EH_FRAME: |
| 11223 | { |
| 11224 | if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info, |
| 11225 | o, contents)) |
| 11226 | return FALSE; |
| 11227 | } |
| 11228 | break; |
| 11229 | case SEC_INFO_TYPE_EH_FRAME_ENTRY: |
| 11230 | { |
| 11231 | if (! _bfd_elf_write_section_eh_frame_entry (output_bfd, |
| 11232 | flinfo->info, |
| 11233 | o, contents)) |
| 11234 | return FALSE; |
| 11235 | } |
| 11236 | break; |
| 11237 | default: |
| 11238 | { |
| 11239 | if (! (o->flags & SEC_EXCLUDE)) |
| 11240 | { |
| 11241 | file_ptr offset = (file_ptr) o->output_offset; |
| 11242 | bfd_size_type todo = o->size; |
| 11243 | |
| 11244 | offset *= bfd_octets_per_byte (output_bfd); |
| 11245 | |
| 11246 | if ((o->flags & SEC_ELF_REVERSE_COPY)) |
| 11247 | { |
| 11248 | /* Reverse-copy input section to output. */ |
| 11249 | do |
| 11250 | { |
| 11251 | todo -= address_size; |
| 11252 | if (! bfd_set_section_contents (output_bfd, |
| 11253 | o->output_section, |
| 11254 | contents + todo, |
| 11255 | offset, |
| 11256 | address_size)) |
| 11257 | return FALSE; |
| 11258 | if (todo == 0) |
| 11259 | break; |
| 11260 | offset += address_size; |
| 11261 | } |
| 11262 | while (1); |
| 11263 | } |
| 11264 | else if (! bfd_set_section_contents (output_bfd, |
| 11265 | o->output_section, |
| 11266 | contents, |
| 11267 | offset, todo)) |
| 11268 | return FALSE; |
| 11269 | } |
| 11270 | } |
| 11271 | break; |
| 11272 | } |
| 11273 | } |
| 11274 | |
| 11275 | return TRUE; |
| 11276 | } |
| 11277 | |
| 11278 | /* Generate a reloc when linking an ELF file. This is a reloc |
| 11279 | requested by the linker, and does not come from any input file. This |
| 11280 | is used to build constructor and destructor tables when linking |
| 11281 | with -Ur. */ |
| 11282 | |
| 11283 | static bfd_boolean |
| 11284 | elf_reloc_link_order (bfd *output_bfd, |
| 11285 | struct bfd_link_info *info, |
| 11286 | asection *output_section, |
| 11287 | struct bfd_link_order *link_order) |
| 11288 | { |
| 11289 | reloc_howto_type *howto; |
| 11290 | long indx; |
| 11291 | bfd_vma offset; |
| 11292 | bfd_vma addend; |
| 11293 | struct bfd_elf_section_reloc_data *reldata; |
| 11294 | struct elf_link_hash_entry **rel_hash_ptr; |
| 11295 | Elf_Internal_Shdr *rel_hdr; |
| 11296 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); |
| 11297 | Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL]; |
| 11298 | bfd_byte *erel; |
| 11299 | unsigned int i; |
| 11300 | struct bfd_elf_section_data *esdo = elf_section_data (output_section); |
| 11301 | |
| 11302 | howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc); |
| 11303 | if (howto == NULL) |
| 11304 | { |
| 11305 | bfd_set_error (bfd_error_bad_value); |
| 11306 | return FALSE; |
| 11307 | } |
| 11308 | |
| 11309 | addend = link_order->u.reloc.p->addend; |
| 11310 | |
| 11311 | if (esdo->rel.hdr) |
| 11312 | reldata = &esdo->rel; |
| 11313 | else if (esdo->rela.hdr) |
| 11314 | reldata = &esdo->rela; |
| 11315 | else |
| 11316 | { |
| 11317 | reldata = NULL; |
| 11318 | BFD_ASSERT (0); |
| 11319 | } |
| 11320 | |
| 11321 | /* Figure out the symbol index. */ |
| 11322 | rel_hash_ptr = reldata->hashes + reldata->count; |
| 11323 | if (link_order->type == bfd_section_reloc_link_order) |
| 11324 | { |
| 11325 | indx = link_order->u.reloc.p->u.section->target_index; |
| 11326 | BFD_ASSERT (indx != 0); |
| 11327 | *rel_hash_ptr = NULL; |
| 11328 | } |
| 11329 | else |
| 11330 | { |
| 11331 | struct elf_link_hash_entry *h; |
| 11332 | |
| 11333 | /* Treat a reloc against a defined symbol as though it were |
| 11334 | actually against the section. */ |
| 11335 | h = ((struct elf_link_hash_entry *) |
| 11336 | bfd_wrapped_link_hash_lookup (output_bfd, info, |
| 11337 | link_order->u.reloc.p->u.name, |
| 11338 | FALSE, FALSE, TRUE)); |
| 11339 | if (h != NULL |
| 11340 | && (h->root.type == bfd_link_hash_defined |
| 11341 | || h->root.type == bfd_link_hash_defweak)) |
| 11342 | { |
| 11343 | asection *section; |
| 11344 | |
| 11345 | section = h->root.u.def.section; |
| 11346 | indx = section->output_section->target_index; |
| 11347 | *rel_hash_ptr = NULL; |
| 11348 | /* It seems that we ought to add the symbol value to the |
| 11349 | addend here, but in practice it has already been added |
| 11350 | because it was passed to constructor_callback. */ |
| 11351 | addend += section->output_section->vma + section->output_offset; |
| 11352 | } |
| 11353 | else if (h != NULL) |
| 11354 | { |
| 11355 | /* Setting the index to -2 tells elf_link_output_extsym that |
| 11356 | this symbol is used by a reloc. */ |
| 11357 | h->indx = -2; |
| 11358 | *rel_hash_ptr = h; |
| 11359 | indx = 0; |
| 11360 | } |
| 11361 | else |
| 11362 | { |
| 11363 | (*info->callbacks->unattached_reloc) |
| 11364 | (info, link_order->u.reloc.p->u.name, NULL, NULL, 0); |
| 11365 | indx = 0; |
| 11366 | } |
| 11367 | } |
| 11368 | |
| 11369 | /* If this is an inplace reloc, we must write the addend into the |
| 11370 | object file. */ |
| 11371 | if (howto->partial_inplace && addend != 0) |
| 11372 | { |
| 11373 | bfd_size_type size; |
| 11374 | bfd_reloc_status_type rstat; |
| 11375 | bfd_byte *buf; |
| 11376 | bfd_boolean ok; |
| 11377 | const char *sym_name; |
| 11378 | |
| 11379 | size = (bfd_size_type) bfd_get_reloc_size (howto); |
| 11380 | buf = (bfd_byte *) bfd_zmalloc (size); |
| 11381 | if (buf == NULL && size != 0) |
| 11382 | return FALSE; |
| 11383 | rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf); |
| 11384 | switch (rstat) |
| 11385 | { |
| 11386 | case bfd_reloc_ok: |
| 11387 | break; |
| 11388 | |
| 11389 | default: |
| 11390 | case bfd_reloc_outofrange: |
| 11391 | abort (); |
| 11392 | |
| 11393 | case bfd_reloc_overflow: |
| 11394 | if (link_order->type == bfd_section_reloc_link_order) |
| 11395 | sym_name = bfd_section_name (output_bfd, |
| 11396 | link_order->u.reloc.p->u.section); |
| 11397 | else |
| 11398 | sym_name = link_order->u.reloc.p->u.name; |
| 11399 | (*info->callbacks->reloc_overflow) (info, NULL, sym_name, |
| 11400 | howto->name, addend, NULL, NULL, |
| 11401 | (bfd_vma) 0); |
| 11402 | break; |
| 11403 | } |
| 11404 | |
| 11405 | ok = bfd_set_section_contents (output_bfd, output_section, buf, |
| 11406 | link_order->offset |
| 11407 | * bfd_octets_per_byte (output_bfd), |
| 11408 | size); |
| 11409 | free (buf); |
| 11410 | if (! ok) |
| 11411 | return FALSE; |
| 11412 | } |
| 11413 | |
| 11414 | /* The address of a reloc is relative to the section in a |
| 11415 | relocatable file, and is a virtual address in an executable |
| 11416 | file. */ |
| 11417 | offset = link_order->offset; |
| 11418 | if (! bfd_link_relocatable (info)) |
| 11419 | offset += output_section->vma; |
| 11420 | |
| 11421 | for (i = 0; i < bed->s->int_rels_per_ext_rel; i++) |
| 11422 | { |
| 11423 | irel[i].r_offset = offset; |
| 11424 | irel[i].r_info = 0; |
| 11425 | irel[i].r_addend = 0; |
| 11426 | } |
| 11427 | if (bed->s->arch_size == 32) |
| 11428 | irel[0].r_info = ELF32_R_INFO (indx, howto->type); |
| 11429 | else |
| 11430 | irel[0].r_info = ELF64_R_INFO (indx, howto->type); |
| 11431 | |
| 11432 | rel_hdr = reldata->hdr; |
| 11433 | erel = rel_hdr->contents; |
| 11434 | if (rel_hdr->sh_type == SHT_REL) |
| 11435 | { |
| 11436 | erel += reldata->count * bed->s->sizeof_rel; |
| 11437 | (*bed->s->swap_reloc_out) (output_bfd, irel, erel); |
| 11438 | } |
| 11439 | else |
| 11440 | { |
| 11441 | irel[0].r_addend = addend; |
| 11442 | erel += reldata->count * bed->s->sizeof_rela; |
| 11443 | (*bed->s->swap_reloca_out) (output_bfd, irel, erel); |
| 11444 | } |
| 11445 | |
| 11446 | ++reldata->count; |
| 11447 | |
| 11448 | return TRUE; |
| 11449 | } |
| 11450 | |
| 11451 | |
| 11452 | /* Get the output vma of the section pointed to by the sh_link field. */ |
| 11453 | |
| 11454 | static bfd_vma |
| 11455 | elf_get_linked_section_vma (struct bfd_link_order *p) |
| 11456 | { |
| 11457 | Elf_Internal_Shdr **elf_shdrp; |
| 11458 | asection *s; |
| 11459 | int elfsec; |
| 11460 | |
| 11461 | s = p->u.indirect.section; |
| 11462 | elf_shdrp = elf_elfsections (s->owner); |
| 11463 | elfsec = _bfd_elf_section_from_bfd_section (s->owner, s); |
| 11464 | elfsec = elf_shdrp[elfsec]->sh_link; |
| 11465 | /* PR 290: |
| 11466 | The Intel C compiler generates SHT_IA_64_UNWIND with |
| 11467 | SHF_LINK_ORDER. But it doesn't set the sh_link or |
| 11468 | sh_info fields. Hence we could get the situation |
| 11469 | where elfsec is 0. */ |
| 11470 | if (elfsec == 0) |
| 11471 | { |
| 11472 | const struct elf_backend_data *bed |
| 11473 | = get_elf_backend_data (s->owner); |
| 11474 | if (bed->link_order_error_handler) |
| 11475 | bed->link_order_error_handler |
| 11476 | /* xgettext:c-format */ |
| 11477 | (_("%pB: warning: sh_link not set for section `%pA'"), s->owner, s); |
| 11478 | return 0; |
| 11479 | } |
| 11480 | else |
| 11481 | { |
| 11482 | s = elf_shdrp[elfsec]->bfd_section; |
| 11483 | return s->output_section->vma + s->output_offset; |
| 11484 | } |
| 11485 | } |
| 11486 | |
| 11487 | |
| 11488 | /* Compare two sections based on the locations of the sections they are |
| 11489 | linked to. Used by elf_fixup_link_order. */ |
| 11490 | |
| 11491 | static int |
| 11492 | compare_link_order (const void * a, const void * b) |
| 11493 | { |
| 11494 | bfd_vma apos; |
| 11495 | bfd_vma bpos; |
| 11496 | |
| 11497 | apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a); |
| 11498 | bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b); |
| 11499 | if (apos < bpos) |
| 11500 | return -1; |
| 11501 | return apos > bpos; |
| 11502 | } |
| 11503 | |
| 11504 | |
| 11505 | /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same |
| 11506 | order as their linked sections. Returns false if this could not be done |
| 11507 | because an output section includes both ordered and unordered |
| 11508 | sections. Ideally we'd do this in the linker proper. */ |
| 11509 | |
| 11510 | static bfd_boolean |
| 11511 | elf_fixup_link_order (bfd *abfd, asection *o) |
| 11512 | { |
| 11513 | int seen_linkorder; |
| 11514 | int seen_other; |
| 11515 | int n; |
| 11516 | struct bfd_link_order *p; |
| 11517 | bfd *sub; |
| 11518 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 11519 | unsigned elfsec; |
| 11520 | struct bfd_link_order **sections; |
| 11521 | asection *s, *other_sec, *linkorder_sec; |
| 11522 | bfd_vma offset; |
| 11523 | |
| 11524 | other_sec = NULL; |
| 11525 | linkorder_sec = NULL; |
| 11526 | seen_other = 0; |
| 11527 | seen_linkorder = 0; |
| 11528 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 11529 | { |
| 11530 | if (p->type == bfd_indirect_link_order) |
| 11531 | { |
| 11532 | s = p->u.indirect.section; |
| 11533 | sub = s->owner; |
| 11534 | if (bfd_get_flavour (sub) == bfd_target_elf_flavour |
| 11535 | && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass |
| 11536 | && (elfsec = _bfd_elf_section_from_bfd_section (sub, s)) |
| 11537 | && elfsec < elf_numsections (sub) |
| 11538 | && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER |
| 11539 | && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub)) |
| 11540 | { |
| 11541 | seen_linkorder++; |
| 11542 | linkorder_sec = s; |
| 11543 | } |
| 11544 | else |
| 11545 | { |
| 11546 | seen_other++; |
| 11547 | other_sec = s; |
| 11548 | } |
| 11549 | } |
| 11550 | else |
| 11551 | seen_other++; |
| 11552 | |
| 11553 | if (seen_other && seen_linkorder) |
| 11554 | { |
| 11555 | if (other_sec && linkorder_sec) |
| 11556 | _bfd_error_handler |
| 11557 | /* xgettext:c-format */ |
| 11558 | (_("%pA has both ordered [`%pA' in %pB] " |
| 11559 | "and unordered [`%pA' in %pB] sections"), |
| 11560 | o, linkorder_sec, linkorder_sec->owner, |
| 11561 | other_sec, other_sec->owner); |
| 11562 | else |
| 11563 | _bfd_error_handler |
| 11564 | (_("%pA has both ordered and unordered sections"), o); |
| 11565 | bfd_set_error (bfd_error_bad_value); |
| 11566 | return FALSE; |
| 11567 | } |
| 11568 | } |
| 11569 | |
| 11570 | if (!seen_linkorder) |
| 11571 | return TRUE; |
| 11572 | |
| 11573 | sections = (struct bfd_link_order **) |
| 11574 | bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *)); |
| 11575 | if (sections == NULL) |
| 11576 | return FALSE; |
| 11577 | seen_linkorder = 0; |
| 11578 | |
| 11579 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 11580 | { |
| 11581 | sections[seen_linkorder++] = p; |
| 11582 | } |
| 11583 | /* Sort the input sections in the order of their linked section. */ |
| 11584 | qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *), |
| 11585 | compare_link_order); |
| 11586 | |
| 11587 | /* Change the offsets of the sections. */ |
| 11588 | offset = 0; |
| 11589 | for (n = 0; n < seen_linkorder; n++) |
| 11590 | { |
| 11591 | s = sections[n]->u.indirect.section; |
| 11592 | offset &= ~(bfd_vma) 0 << s->alignment_power; |
| 11593 | s->output_offset = offset / bfd_octets_per_byte (abfd); |
| 11594 | sections[n]->offset = offset; |
| 11595 | offset += sections[n]->size; |
| 11596 | } |
| 11597 | |
| 11598 | free (sections); |
| 11599 | return TRUE; |
| 11600 | } |
| 11601 | |
| 11602 | /* Generate an import library in INFO->implib_bfd from symbols in ABFD. |
| 11603 | Returns TRUE upon success, FALSE otherwise. */ |
| 11604 | |
| 11605 | static bfd_boolean |
| 11606 | elf_output_implib (bfd *abfd, struct bfd_link_info *info) |
| 11607 | { |
| 11608 | bfd_boolean ret = FALSE; |
| 11609 | bfd *implib_bfd; |
| 11610 | const struct elf_backend_data *bed; |
| 11611 | flagword flags; |
| 11612 | enum bfd_architecture arch; |
| 11613 | unsigned int mach; |
| 11614 | asymbol **sympp = NULL; |
| 11615 | long symsize; |
| 11616 | long symcount; |
| 11617 | long src_count; |
| 11618 | elf_symbol_type *osymbuf; |
| 11619 | |
| 11620 | implib_bfd = info->out_implib_bfd; |
| 11621 | bed = get_elf_backend_data (abfd); |
| 11622 | |
| 11623 | if (!bfd_set_format (implib_bfd, bfd_object)) |
| 11624 | return FALSE; |
| 11625 | |
| 11626 | /* Use flag from executable but make it a relocatable object. */ |
| 11627 | flags = bfd_get_file_flags (abfd); |
| 11628 | flags &= ~HAS_RELOC; |
| 11629 | if (!bfd_set_start_address (implib_bfd, 0) |
| 11630 | || !bfd_set_file_flags (implib_bfd, flags & ~EXEC_P)) |
| 11631 | return FALSE; |
| 11632 | |
| 11633 | /* Copy architecture of output file to import library file. */ |
| 11634 | arch = bfd_get_arch (abfd); |
| 11635 | mach = bfd_get_mach (abfd); |
| 11636 | if (!bfd_set_arch_mach (implib_bfd, arch, mach) |
| 11637 | && (abfd->target_defaulted |
| 11638 | || bfd_get_arch (abfd) != bfd_get_arch (implib_bfd))) |
| 11639 | return FALSE; |
| 11640 | |
| 11641 | /* Get symbol table size. */ |
| 11642 | symsize = bfd_get_symtab_upper_bound (abfd); |
| 11643 | if (symsize < 0) |
| 11644 | return FALSE; |
| 11645 | |
| 11646 | /* Read in the symbol table. */ |
| 11647 | sympp = (asymbol **) xmalloc (symsize); |
| 11648 | symcount = bfd_canonicalize_symtab (abfd, sympp); |
| 11649 | if (symcount < 0) |
| 11650 | goto free_sym_buf; |
| 11651 | |
| 11652 | /* Allow the BFD backend to copy any private header data it |
| 11653 | understands from the output BFD to the import library BFD. */ |
| 11654 | if (! bfd_copy_private_header_data (abfd, implib_bfd)) |
| 11655 | goto free_sym_buf; |
| 11656 | |
| 11657 | /* Filter symbols to appear in the import library. */ |
| 11658 | if (bed->elf_backend_filter_implib_symbols) |
| 11659 | symcount = bed->elf_backend_filter_implib_symbols (abfd, info, sympp, |
| 11660 | symcount); |
| 11661 | else |
| 11662 | symcount = _bfd_elf_filter_global_symbols (abfd, info, sympp, symcount); |
| 11663 | if (symcount == 0) |
| 11664 | { |
| 11665 | bfd_set_error (bfd_error_no_symbols); |
| 11666 | _bfd_error_handler (_("%pB: no symbol found for import library"), |
| 11667 | implib_bfd); |
| 11668 | goto free_sym_buf; |
| 11669 | } |
| 11670 | |
| 11671 | |
| 11672 | /* Make symbols absolute. */ |
| 11673 | osymbuf = (elf_symbol_type *) bfd_alloc2 (implib_bfd, symcount, |
| 11674 | sizeof (*osymbuf)); |
| 11675 | for (src_count = 0; src_count < symcount; src_count++) |
| 11676 | { |
| 11677 | memcpy (&osymbuf[src_count], (elf_symbol_type *) sympp[src_count], |
| 11678 | sizeof (*osymbuf)); |
| 11679 | osymbuf[src_count].symbol.section = bfd_abs_section_ptr; |
| 11680 | osymbuf[src_count].internal_elf_sym.st_shndx = SHN_ABS; |
| 11681 | osymbuf[src_count].symbol.value += sympp[src_count]->section->vma; |
| 11682 | osymbuf[src_count].internal_elf_sym.st_value = |
| 11683 | osymbuf[src_count].symbol.value; |
| 11684 | sympp[src_count] = &osymbuf[src_count].symbol; |
| 11685 | } |
| 11686 | |
| 11687 | bfd_set_symtab (implib_bfd, sympp, symcount); |
| 11688 | |
| 11689 | /* Allow the BFD backend to copy any private data it understands |
| 11690 | from the output BFD to the import library BFD. This is done last |
| 11691 | to permit the routine to look at the filtered symbol table. */ |
| 11692 | if (! bfd_copy_private_bfd_data (abfd, implib_bfd)) |
| 11693 | goto free_sym_buf; |
| 11694 | |
| 11695 | if (!bfd_close (implib_bfd)) |
| 11696 | goto free_sym_buf; |
| 11697 | |
| 11698 | ret = TRUE; |
| 11699 | |
| 11700 | free_sym_buf: |
| 11701 | free (sympp); |
| 11702 | return ret; |
| 11703 | } |
| 11704 | |
| 11705 | static void |
| 11706 | elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo) |
| 11707 | { |
| 11708 | asection *o; |
| 11709 | |
| 11710 | if (flinfo->symstrtab != NULL) |
| 11711 | _bfd_elf_strtab_free (flinfo->symstrtab); |
| 11712 | if (flinfo->contents != NULL) |
| 11713 | free (flinfo->contents); |
| 11714 | if (flinfo->external_relocs != NULL) |
| 11715 | free (flinfo->external_relocs); |
| 11716 | if (flinfo->internal_relocs != NULL) |
| 11717 | free (flinfo->internal_relocs); |
| 11718 | if (flinfo->external_syms != NULL) |
| 11719 | free (flinfo->external_syms); |
| 11720 | if (flinfo->locsym_shndx != NULL) |
| 11721 | free (flinfo->locsym_shndx); |
| 11722 | if (flinfo->internal_syms != NULL) |
| 11723 | free (flinfo->internal_syms); |
| 11724 | if (flinfo->indices != NULL) |
| 11725 | free (flinfo->indices); |
| 11726 | if (flinfo->sections != NULL) |
| 11727 | free (flinfo->sections); |
| 11728 | if (flinfo->symshndxbuf != NULL |
| 11729 | && flinfo->symshndxbuf != (Elf_External_Sym_Shndx *) -1) |
| 11730 | free (flinfo->symshndxbuf); |
| 11731 | for (o = obfd->sections; o != NULL; o = o->next) |
| 11732 | { |
| 11733 | struct bfd_elf_section_data *esdo = elf_section_data (o); |
| 11734 | if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL) |
| 11735 | free (esdo->rel.hashes); |
| 11736 | if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL) |
| 11737 | free (esdo->rela.hashes); |
| 11738 | } |
| 11739 | } |
| 11740 | |
| 11741 | /* Do the final step of an ELF link. */ |
| 11742 | |
| 11743 | bfd_boolean |
| 11744 | bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info) |
| 11745 | { |
| 11746 | bfd_boolean dynamic; |
| 11747 | bfd_boolean emit_relocs; |
| 11748 | bfd *dynobj; |
| 11749 | struct elf_final_link_info flinfo; |
| 11750 | asection *o; |
| 11751 | struct bfd_link_order *p; |
| 11752 | bfd *sub; |
| 11753 | bfd_size_type max_contents_size; |
| 11754 | bfd_size_type max_external_reloc_size; |
| 11755 | bfd_size_type max_internal_reloc_count; |
| 11756 | bfd_size_type max_sym_count; |
| 11757 | bfd_size_type max_sym_shndx_count; |
| 11758 | Elf_Internal_Sym elfsym; |
| 11759 | unsigned int i; |
| 11760 | Elf_Internal_Shdr *symtab_hdr; |
| 11761 | Elf_Internal_Shdr *symtab_shndx_hdr; |
| 11762 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 11763 | struct elf_outext_info eoinfo; |
| 11764 | bfd_boolean merged; |
| 11765 | size_t relativecount = 0; |
| 11766 | asection *reldyn = 0; |
| 11767 | bfd_size_type amt; |
| 11768 | asection *attr_section = NULL; |
| 11769 | bfd_vma attr_size = 0; |
| 11770 | const char *std_attrs_section; |
| 11771 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 11772 | |
| 11773 | if (!is_elf_hash_table (htab)) |
| 11774 | return FALSE; |
| 11775 | |
| 11776 | if (bfd_link_pic (info)) |
| 11777 | abfd->flags |= DYNAMIC; |
| 11778 | |
| 11779 | dynamic = htab->dynamic_sections_created; |
| 11780 | dynobj = htab->dynobj; |
| 11781 | |
| 11782 | emit_relocs = (bfd_link_relocatable (info) |
| 11783 | || info->emitrelocations); |
| 11784 | |
| 11785 | flinfo.info = info; |
| 11786 | flinfo.output_bfd = abfd; |
| 11787 | flinfo.symstrtab = _bfd_elf_strtab_init (); |
| 11788 | if (flinfo.symstrtab == NULL) |
| 11789 | return FALSE; |
| 11790 | |
| 11791 | if (! dynamic) |
| 11792 | { |
| 11793 | flinfo.hash_sec = NULL; |
| 11794 | flinfo.symver_sec = NULL; |
| 11795 | } |
| 11796 | else |
| 11797 | { |
| 11798 | flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash"); |
| 11799 | /* Note that dynsym_sec can be NULL (on VMS). */ |
| 11800 | flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version"); |
| 11801 | /* Note that it is OK if symver_sec is NULL. */ |
| 11802 | } |
| 11803 | |
| 11804 | flinfo.contents = NULL; |
| 11805 | flinfo.external_relocs = NULL; |
| 11806 | flinfo.internal_relocs = NULL; |
| 11807 | flinfo.external_syms = NULL; |
| 11808 | flinfo.locsym_shndx = NULL; |
| 11809 | flinfo.internal_syms = NULL; |
| 11810 | flinfo.indices = NULL; |
| 11811 | flinfo.sections = NULL; |
| 11812 | flinfo.symshndxbuf = NULL; |
| 11813 | flinfo.filesym_count = 0; |
| 11814 | |
| 11815 | /* The object attributes have been merged. Remove the input |
| 11816 | sections from the link, and set the contents of the output |
| 11817 | secton. */ |
| 11818 | std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section; |
| 11819 | for (o = abfd->sections; o != NULL; o = o->next) |
| 11820 | { |
| 11821 | bfd_boolean remove_section = FALSE; |
| 11822 | |
| 11823 | if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0) |
| 11824 | || strcmp (o->name, ".gnu.attributes") == 0) |
| 11825 | { |
| 11826 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 11827 | { |
| 11828 | asection *input_section; |
| 11829 | |
| 11830 | if (p->type != bfd_indirect_link_order) |
| 11831 | continue; |
| 11832 | input_section = p->u.indirect.section; |
| 11833 | /* Hack: reset the SEC_HAS_CONTENTS flag so that |
| 11834 | elf_link_input_bfd ignores this section. */ |
| 11835 | input_section->flags &= ~SEC_HAS_CONTENTS; |
| 11836 | } |
| 11837 | |
| 11838 | attr_size = bfd_elf_obj_attr_size (abfd); |
| 11839 | bfd_set_section_size (abfd, o, attr_size); |
| 11840 | /* Skip this section later on. */ |
| 11841 | o->map_head.link_order = NULL; |
| 11842 | if (attr_size) |
| 11843 | attr_section = o; |
| 11844 | else |
| 11845 | remove_section = TRUE; |
| 11846 | } |
| 11847 | else if ((o->flags & SEC_GROUP) != 0 && o->size == 0) |
| 11848 | { |
| 11849 | /* Remove empty group section from linker output. */ |
| 11850 | remove_section = TRUE; |
| 11851 | } |
| 11852 | if (remove_section) |
| 11853 | { |
| 11854 | o->flags |= SEC_EXCLUDE; |
| 11855 | bfd_section_list_remove (abfd, o); |
| 11856 | abfd->section_count--; |
| 11857 | } |
| 11858 | } |
| 11859 | |
| 11860 | /* Count up the number of relocations we will output for each output |
| 11861 | section, so that we know the sizes of the reloc sections. We |
| 11862 | also figure out some maximum sizes. */ |
| 11863 | max_contents_size = 0; |
| 11864 | max_external_reloc_size = 0; |
| 11865 | max_internal_reloc_count = 0; |
| 11866 | max_sym_count = 0; |
| 11867 | max_sym_shndx_count = 0; |
| 11868 | merged = FALSE; |
| 11869 | for (o = abfd->sections; o != NULL; o = o->next) |
| 11870 | { |
| 11871 | struct bfd_elf_section_data *esdo = elf_section_data (o); |
| 11872 | o->reloc_count = 0; |
| 11873 | |
| 11874 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 11875 | { |
| 11876 | unsigned int reloc_count = 0; |
| 11877 | unsigned int additional_reloc_count = 0; |
| 11878 | struct bfd_elf_section_data *esdi = NULL; |
| 11879 | |
| 11880 | if (p->type == bfd_section_reloc_link_order |
| 11881 | || p->type == bfd_symbol_reloc_link_order) |
| 11882 | reloc_count = 1; |
| 11883 | else if (p->type == bfd_indirect_link_order) |
| 11884 | { |
| 11885 | asection *sec; |
| 11886 | |
| 11887 | sec = p->u.indirect.section; |
| 11888 | |
| 11889 | /* Mark all sections which are to be included in the |
| 11890 | link. This will normally be every section. We need |
| 11891 | to do this so that we can identify any sections which |
| 11892 | the linker has decided to not include. */ |
| 11893 | sec->linker_mark = TRUE; |
| 11894 | |
| 11895 | if (sec->flags & SEC_MERGE) |
| 11896 | merged = TRUE; |
| 11897 | |
| 11898 | if (sec->rawsize > max_contents_size) |
| 11899 | max_contents_size = sec->rawsize; |
| 11900 | if (sec->size > max_contents_size) |
| 11901 | max_contents_size = sec->size; |
| 11902 | |
| 11903 | if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour |
| 11904 | && (sec->owner->flags & DYNAMIC) == 0) |
| 11905 | { |
| 11906 | size_t sym_count; |
| 11907 | |
| 11908 | /* We are interested in just local symbols, not all |
| 11909 | symbols. */ |
| 11910 | if (elf_bad_symtab (sec->owner)) |
| 11911 | sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size |
| 11912 | / bed->s->sizeof_sym); |
| 11913 | else |
| 11914 | sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info; |
| 11915 | |
| 11916 | if (sym_count > max_sym_count) |
| 11917 | max_sym_count = sym_count; |
| 11918 | |
| 11919 | if (sym_count > max_sym_shndx_count |
| 11920 | && elf_symtab_shndx_list (sec->owner) != NULL) |
| 11921 | max_sym_shndx_count = sym_count; |
| 11922 | |
| 11923 | if (esdo->this_hdr.sh_type == SHT_REL |
| 11924 | || esdo->this_hdr.sh_type == SHT_RELA) |
| 11925 | /* Some backends use reloc_count in relocation sections |
| 11926 | to count particular types of relocs. Of course, |
| 11927 | reloc sections themselves can't have relocations. */ |
| 11928 | ; |
| 11929 | else if (emit_relocs) |
| 11930 | { |
| 11931 | reloc_count = sec->reloc_count; |
| 11932 | if (bed->elf_backend_count_additional_relocs) |
| 11933 | { |
| 11934 | int c; |
| 11935 | c = (*bed->elf_backend_count_additional_relocs) (sec); |
| 11936 | additional_reloc_count += c; |
| 11937 | } |
| 11938 | } |
| 11939 | else if (bed->elf_backend_count_relocs) |
| 11940 | reloc_count = (*bed->elf_backend_count_relocs) (info, sec); |
| 11941 | |
| 11942 | esdi = elf_section_data (sec); |
| 11943 | |
| 11944 | if ((sec->flags & SEC_RELOC) != 0) |
| 11945 | { |
| 11946 | size_t ext_size = 0; |
| 11947 | |
| 11948 | if (esdi->rel.hdr != NULL) |
| 11949 | ext_size = esdi->rel.hdr->sh_size; |
| 11950 | if (esdi->rela.hdr != NULL) |
| 11951 | ext_size += esdi->rela.hdr->sh_size; |
| 11952 | |
| 11953 | if (ext_size > max_external_reloc_size) |
| 11954 | max_external_reloc_size = ext_size; |
| 11955 | if (sec->reloc_count > max_internal_reloc_count) |
| 11956 | max_internal_reloc_count = sec->reloc_count; |
| 11957 | } |
| 11958 | } |
| 11959 | } |
| 11960 | |
| 11961 | if (reloc_count == 0) |
| 11962 | continue; |
| 11963 | |
| 11964 | reloc_count += additional_reloc_count; |
| 11965 | o->reloc_count += reloc_count; |
| 11966 | |
| 11967 | if (p->type == bfd_indirect_link_order && emit_relocs) |
| 11968 | { |
| 11969 | if (esdi->rel.hdr) |
| 11970 | { |
| 11971 | esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr); |
| 11972 | esdo->rel.count += additional_reloc_count; |
| 11973 | } |
| 11974 | if (esdi->rela.hdr) |
| 11975 | { |
| 11976 | esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr); |
| 11977 | esdo->rela.count += additional_reloc_count; |
| 11978 | } |
| 11979 | } |
| 11980 | else |
| 11981 | { |
| 11982 | if (o->use_rela_p) |
| 11983 | esdo->rela.count += reloc_count; |
| 11984 | else |
| 11985 | esdo->rel.count += reloc_count; |
| 11986 | } |
| 11987 | } |
| 11988 | |
| 11989 | if (o->reloc_count > 0) |
| 11990 | o->flags |= SEC_RELOC; |
| 11991 | else |
| 11992 | { |
| 11993 | /* Explicitly clear the SEC_RELOC flag. The linker tends to |
| 11994 | set it (this is probably a bug) and if it is set |
| 11995 | assign_section_numbers will create a reloc section. */ |
| 11996 | o->flags &=~ SEC_RELOC; |
| 11997 | } |
| 11998 | |
| 11999 | /* If the SEC_ALLOC flag is not set, force the section VMA to |
| 12000 | zero. This is done in elf_fake_sections as well, but forcing |
| 12001 | the VMA to 0 here will ensure that relocs against these |
| 12002 | sections are handled correctly. */ |
| 12003 | if ((o->flags & SEC_ALLOC) == 0 |
| 12004 | && ! o->user_set_vma) |
| 12005 | o->vma = 0; |
| 12006 | } |
| 12007 | |
| 12008 | if (! bfd_link_relocatable (info) && merged) |
| 12009 | elf_link_hash_traverse (htab, _bfd_elf_link_sec_merge_syms, abfd); |
| 12010 | |
| 12011 | /* Figure out the file positions for everything but the symbol table |
| 12012 | and the relocs. We set symcount to force assign_section_numbers |
| 12013 | to create a symbol table. */ |
| 12014 | bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs; |
| 12015 | BFD_ASSERT (! abfd->output_has_begun); |
| 12016 | if (! _bfd_elf_compute_section_file_positions (abfd, info)) |
| 12017 | goto error_return; |
| 12018 | |
| 12019 | /* Set sizes, and assign file positions for reloc sections. */ |
| 12020 | for (o = abfd->sections; o != NULL; o = o->next) |
| 12021 | { |
| 12022 | struct bfd_elf_section_data *esdo = elf_section_data (o); |
| 12023 | if ((o->flags & SEC_RELOC) != 0) |
| 12024 | { |
| 12025 | if (esdo->rel.hdr |
| 12026 | && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel))) |
| 12027 | goto error_return; |
| 12028 | |
| 12029 | if (esdo->rela.hdr |
| 12030 | && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela))) |
| 12031 | goto error_return; |
| 12032 | } |
| 12033 | |
| 12034 | /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them |
| 12035 | to count upwards while actually outputting the relocations. */ |
| 12036 | esdo->rel.count = 0; |
| 12037 | esdo->rela.count = 0; |
| 12038 | |
| 12039 | if (esdo->this_hdr.sh_offset == (file_ptr) -1) |
| 12040 | { |
| 12041 | /* Cache the section contents so that they can be compressed |
| 12042 | later. Use bfd_malloc since it will be freed by |
| 12043 | bfd_compress_section_contents. */ |
| 12044 | unsigned char *contents = esdo->this_hdr.contents; |
| 12045 | if ((o->flags & SEC_ELF_COMPRESS) == 0 || contents != NULL) |
| 12046 | abort (); |
| 12047 | contents |
| 12048 | = (unsigned char *) bfd_malloc (esdo->this_hdr.sh_size); |
| 12049 | if (contents == NULL) |
| 12050 | goto error_return; |
| 12051 | esdo->this_hdr.contents = contents; |
| 12052 | } |
| 12053 | } |
| 12054 | |
| 12055 | /* We have now assigned file positions for all the sections except |
| 12056 | .symtab, .strtab, and non-loaded reloc sections. We start the |
| 12057 | .symtab section at the current file position, and write directly |
| 12058 | to it. We build the .strtab section in memory. */ |
| 12059 | bfd_get_symcount (abfd) = 0; |
| 12060 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 12061 | /* sh_name is set in prep_headers. */ |
| 12062 | symtab_hdr->sh_type = SHT_SYMTAB; |
| 12063 | /* sh_flags, sh_addr and sh_size all start off zero. */ |
| 12064 | symtab_hdr->sh_entsize = bed->s->sizeof_sym; |
| 12065 | /* sh_link is set in assign_section_numbers. */ |
| 12066 | /* sh_info is set below. */ |
| 12067 | /* sh_offset is set just below. */ |
| 12068 | symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align; |
| 12069 | |
| 12070 | if (max_sym_count < 20) |
| 12071 | max_sym_count = 20; |
| 12072 | htab->strtabsize = max_sym_count; |
| 12073 | amt = max_sym_count * sizeof (struct elf_sym_strtab); |
| 12074 | htab->strtab = (struct elf_sym_strtab *) bfd_malloc (amt); |
| 12075 | if (htab->strtab == NULL) |
| 12076 | goto error_return; |
| 12077 | /* The real buffer will be allocated in elf_link_swap_symbols_out. */ |
| 12078 | flinfo.symshndxbuf |
| 12079 | = (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF) |
| 12080 | ? (Elf_External_Sym_Shndx *) -1 : NULL); |
| 12081 | |
| 12082 | if (info->strip != strip_all || emit_relocs) |
| 12083 | { |
| 12084 | file_ptr off = elf_next_file_pos (abfd); |
| 12085 | |
| 12086 | _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE); |
| 12087 | |
| 12088 | /* Note that at this point elf_next_file_pos (abfd) is |
| 12089 | incorrect. We do not yet know the size of the .symtab section. |
| 12090 | We correct next_file_pos below, after we do know the size. */ |
| 12091 | |
| 12092 | /* Start writing out the symbol table. The first symbol is always a |
| 12093 | dummy symbol. */ |
| 12094 | elfsym.st_value = 0; |
| 12095 | elfsym.st_size = 0; |
| 12096 | elfsym.st_info = 0; |
| 12097 | elfsym.st_other = 0; |
| 12098 | elfsym.st_shndx = SHN_UNDEF; |
| 12099 | elfsym.st_target_internal = 0; |
| 12100 | if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym, |
| 12101 | bfd_und_section_ptr, NULL) != 1) |
| 12102 | goto error_return; |
| 12103 | |
| 12104 | /* Output a symbol for each section. We output these even if we are |
| 12105 | discarding local symbols, since they are used for relocs. These |
| 12106 | symbols have no names. We store the index of each one in the |
| 12107 | index field of the section, so that we can find it again when |
| 12108 | outputting relocs. */ |
| 12109 | |
| 12110 | elfsym.st_size = 0; |
| 12111 | elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION); |
| 12112 | elfsym.st_other = 0; |
| 12113 | elfsym.st_value = 0; |
| 12114 | elfsym.st_target_internal = 0; |
| 12115 | for (i = 1; i < elf_numsections (abfd); i++) |
| 12116 | { |
| 12117 | o = bfd_section_from_elf_index (abfd, i); |
| 12118 | if (o != NULL) |
| 12119 | { |
| 12120 | o->target_index = bfd_get_symcount (abfd); |
| 12121 | elfsym.st_shndx = i; |
| 12122 | if (!bfd_link_relocatable (info)) |
| 12123 | elfsym.st_value = o->vma; |
| 12124 | if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym, o, |
| 12125 | NULL) != 1) |
| 12126 | goto error_return; |
| 12127 | } |
| 12128 | } |
| 12129 | } |
| 12130 | |
| 12131 | /* Allocate some memory to hold information read in from the input |
| 12132 | files. */ |
| 12133 | if (max_contents_size != 0) |
| 12134 | { |
| 12135 | flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size); |
| 12136 | if (flinfo.contents == NULL) |
| 12137 | goto error_return; |
| 12138 | } |
| 12139 | |
| 12140 | if (max_external_reloc_size != 0) |
| 12141 | { |
| 12142 | flinfo.external_relocs = bfd_malloc (max_external_reloc_size); |
| 12143 | if (flinfo.external_relocs == NULL) |
| 12144 | goto error_return; |
| 12145 | } |
| 12146 | |
| 12147 | if (max_internal_reloc_count != 0) |
| 12148 | { |
| 12149 | amt = max_internal_reloc_count * sizeof (Elf_Internal_Rela); |
| 12150 | flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt); |
| 12151 | if (flinfo.internal_relocs == NULL) |
| 12152 | goto error_return; |
| 12153 | } |
| 12154 | |
| 12155 | if (max_sym_count != 0) |
| 12156 | { |
| 12157 | amt = max_sym_count * bed->s->sizeof_sym; |
| 12158 | flinfo.external_syms = (bfd_byte *) bfd_malloc (amt); |
| 12159 | if (flinfo.external_syms == NULL) |
| 12160 | goto error_return; |
| 12161 | |
| 12162 | amt = max_sym_count * sizeof (Elf_Internal_Sym); |
| 12163 | flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt); |
| 12164 | if (flinfo.internal_syms == NULL) |
| 12165 | goto error_return; |
| 12166 | |
| 12167 | amt = max_sym_count * sizeof (long); |
| 12168 | flinfo.indices = (long int *) bfd_malloc (amt); |
| 12169 | if (flinfo.indices == NULL) |
| 12170 | goto error_return; |
| 12171 | |
| 12172 | amt = max_sym_count * sizeof (asection *); |
| 12173 | flinfo.sections = (asection **) bfd_malloc (amt); |
| 12174 | if (flinfo.sections == NULL) |
| 12175 | goto error_return; |
| 12176 | } |
| 12177 | |
| 12178 | if (max_sym_shndx_count != 0) |
| 12179 | { |
| 12180 | amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx); |
| 12181 | flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt); |
| 12182 | if (flinfo.locsym_shndx == NULL) |
| 12183 | goto error_return; |
| 12184 | } |
| 12185 | |
| 12186 | if (htab->tls_sec) |
| 12187 | { |
| 12188 | bfd_vma base, end = 0; |
| 12189 | asection *sec; |
| 12190 | |
| 12191 | for (sec = htab->tls_sec; |
| 12192 | sec && (sec->flags & SEC_THREAD_LOCAL); |
| 12193 | sec = sec->next) |
| 12194 | { |
| 12195 | bfd_size_type size = sec->size; |
| 12196 | |
| 12197 | if (size == 0 |
| 12198 | && (sec->flags & SEC_HAS_CONTENTS) == 0) |
| 12199 | { |
| 12200 | struct bfd_link_order *ord = sec->map_tail.link_order; |
| 12201 | |
| 12202 | if (ord != NULL) |
| 12203 | size = ord->offset + ord->size; |
| 12204 | } |
| 12205 | end = sec->vma + size; |
| 12206 | } |
| 12207 | base = htab->tls_sec->vma; |
| 12208 | /* Only align end of TLS section if static TLS doesn't have special |
| 12209 | alignment requirements. */ |
| 12210 | if (bed->static_tls_alignment == 1) |
| 12211 | end = align_power (end, htab->tls_sec->alignment_power); |
| 12212 | htab->tls_size = end - base; |
| 12213 | } |
| 12214 | |
| 12215 | /* Reorder SHF_LINK_ORDER sections. */ |
| 12216 | for (o = abfd->sections; o != NULL; o = o->next) |
| 12217 | { |
| 12218 | if (!elf_fixup_link_order (abfd, o)) |
| 12219 | return FALSE; |
| 12220 | } |
| 12221 | |
| 12222 | if (!_bfd_elf_fixup_eh_frame_hdr (info)) |
| 12223 | return FALSE; |
| 12224 | |
| 12225 | /* Since ELF permits relocations to be against local symbols, we |
| 12226 | must have the local symbols available when we do the relocations. |
| 12227 | Since we would rather only read the local symbols once, and we |
| 12228 | would rather not keep them in memory, we handle all the |
| 12229 | relocations for a single input file at the same time. |
| 12230 | |
| 12231 | Unfortunately, there is no way to know the total number of local |
| 12232 | symbols until we have seen all of them, and the local symbol |
| 12233 | indices precede the global symbol indices. This means that when |
| 12234 | we are generating relocatable output, and we see a reloc against |
| 12235 | a global symbol, we can not know the symbol index until we have |
| 12236 | finished examining all the local symbols to see which ones we are |
| 12237 | going to output. To deal with this, we keep the relocations in |
| 12238 | memory, and don't output them until the end of the link. This is |
| 12239 | an unfortunate waste of memory, but I don't see a good way around |
| 12240 | it. Fortunately, it only happens when performing a relocatable |
| 12241 | link, which is not the common case. FIXME: If keep_memory is set |
| 12242 | we could write the relocs out and then read them again; I don't |
| 12243 | know how bad the memory loss will be. */ |
| 12244 | |
| 12245 | for (sub = info->input_bfds; sub != NULL; sub = sub->link.next) |
| 12246 | sub->output_has_begun = FALSE; |
| 12247 | for (o = abfd->sections; o != NULL; o = o->next) |
| 12248 | { |
| 12249 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 12250 | { |
| 12251 | if (p->type == bfd_indirect_link_order |
| 12252 | && (bfd_get_flavour ((sub = p->u.indirect.section->owner)) |
| 12253 | == bfd_target_elf_flavour) |
| 12254 | && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass) |
| 12255 | { |
| 12256 | if (! sub->output_has_begun) |
| 12257 | { |
| 12258 | if (! elf_link_input_bfd (&flinfo, sub)) |
| 12259 | goto error_return; |
| 12260 | sub->output_has_begun = TRUE; |
| 12261 | } |
| 12262 | } |
| 12263 | else if (p->type == bfd_section_reloc_link_order |
| 12264 | || p->type == bfd_symbol_reloc_link_order) |
| 12265 | { |
| 12266 | if (! elf_reloc_link_order (abfd, info, o, p)) |
| 12267 | goto error_return; |
| 12268 | } |
| 12269 | else |
| 12270 | { |
| 12271 | if (! _bfd_default_link_order (abfd, info, o, p)) |
| 12272 | { |
| 12273 | if (p->type == bfd_indirect_link_order |
| 12274 | && (bfd_get_flavour (sub) |
| 12275 | == bfd_target_elf_flavour) |
| 12276 | && (elf_elfheader (sub)->e_ident[EI_CLASS] |
| 12277 | != bed->s->elfclass)) |
| 12278 | { |
| 12279 | const char *iclass, *oclass; |
| 12280 | |
| 12281 | switch (bed->s->elfclass) |
| 12282 | { |
| 12283 | case ELFCLASS64: oclass = "ELFCLASS64"; break; |
| 12284 | case ELFCLASS32: oclass = "ELFCLASS32"; break; |
| 12285 | case ELFCLASSNONE: oclass = "ELFCLASSNONE"; break; |
| 12286 | default: abort (); |
| 12287 | } |
| 12288 | |
| 12289 | switch (elf_elfheader (sub)->e_ident[EI_CLASS]) |
| 12290 | { |
| 12291 | case ELFCLASS64: iclass = "ELFCLASS64"; break; |
| 12292 | case ELFCLASS32: iclass = "ELFCLASS32"; break; |
| 12293 | case ELFCLASSNONE: iclass = "ELFCLASSNONE"; break; |
| 12294 | default: abort (); |
| 12295 | } |
| 12296 | |
| 12297 | bfd_set_error (bfd_error_wrong_format); |
| 12298 | _bfd_error_handler |
| 12299 | /* xgettext:c-format */ |
| 12300 | (_("%pB: file class %s incompatible with %s"), |
| 12301 | sub, iclass, oclass); |
| 12302 | } |
| 12303 | |
| 12304 | goto error_return; |
| 12305 | } |
| 12306 | } |
| 12307 | } |
| 12308 | } |
| 12309 | |
| 12310 | /* Free symbol buffer if needed. */ |
| 12311 | if (!info->reduce_memory_overheads) |
| 12312 | { |
| 12313 | for (sub = info->input_bfds; sub != NULL; sub = sub->link.next) |
| 12314 | if (bfd_get_flavour (sub) == bfd_target_elf_flavour |
| 12315 | && elf_tdata (sub)->symbuf) |
| 12316 | { |
| 12317 | free (elf_tdata (sub)->symbuf); |
| 12318 | elf_tdata (sub)->symbuf = NULL; |
| 12319 | } |
| 12320 | } |
| 12321 | |
| 12322 | /* Output any global symbols that got converted to local in a |
| 12323 | version script or due to symbol visibility. We do this in a |
| 12324 | separate step since ELF requires all local symbols to appear |
| 12325 | prior to any global symbols. FIXME: We should only do this if |
| 12326 | some global symbols were, in fact, converted to become local. |
| 12327 | FIXME: Will this work correctly with the Irix 5 linker? */ |
| 12328 | eoinfo.failed = FALSE; |
| 12329 | eoinfo.flinfo = &flinfo; |
| 12330 | eoinfo.localsyms = TRUE; |
| 12331 | eoinfo.file_sym_done = FALSE; |
| 12332 | bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo); |
| 12333 | if (eoinfo.failed) |
| 12334 | return FALSE; |
| 12335 | |
| 12336 | /* If backend needs to output some local symbols not present in the hash |
| 12337 | table, do it now. */ |
| 12338 | if (bed->elf_backend_output_arch_local_syms |
| 12339 | && (info->strip != strip_all || emit_relocs)) |
| 12340 | { |
| 12341 | typedef int (*out_sym_func) |
| 12342 | (void *, const char *, Elf_Internal_Sym *, asection *, |
| 12343 | struct elf_link_hash_entry *); |
| 12344 | |
| 12345 | if (! ((*bed->elf_backend_output_arch_local_syms) |
| 12346 | (abfd, info, &flinfo, |
| 12347 | (out_sym_func) elf_link_output_symstrtab))) |
| 12348 | return FALSE; |
| 12349 | } |
| 12350 | |
| 12351 | /* That wrote out all the local symbols. Finish up the symbol table |
| 12352 | with the global symbols. Even if we want to strip everything we |
| 12353 | can, we still need to deal with those global symbols that got |
| 12354 | converted to local in a version script. */ |
| 12355 | |
| 12356 | /* The sh_info field records the index of the first non local symbol. */ |
| 12357 | symtab_hdr->sh_info = bfd_get_symcount (abfd); |
| 12358 | |
| 12359 | if (dynamic |
| 12360 | && htab->dynsym != NULL |
| 12361 | && htab->dynsym->output_section != bfd_abs_section_ptr) |
| 12362 | { |
| 12363 | Elf_Internal_Sym sym; |
| 12364 | bfd_byte *dynsym = htab->dynsym->contents; |
| 12365 | |
| 12366 | o = htab->dynsym->output_section; |
| 12367 | elf_section_data (o)->this_hdr.sh_info = htab->local_dynsymcount + 1; |
| 12368 | |
| 12369 | /* Write out the section symbols for the output sections. */ |
| 12370 | if (bfd_link_pic (info) |
| 12371 | || htab->is_relocatable_executable) |
| 12372 | { |
| 12373 | asection *s; |
| 12374 | |
| 12375 | sym.st_size = 0; |
| 12376 | sym.st_name = 0; |
| 12377 | sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION); |
| 12378 | sym.st_other = 0; |
| 12379 | sym.st_target_internal = 0; |
| 12380 | |
| 12381 | for (s = abfd->sections; s != NULL; s = s->next) |
| 12382 | { |
| 12383 | int indx; |
| 12384 | bfd_byte *dest; |
| 12385 | long dynindx; |
| 12386 | |
| 12387 | dynindx = elf_section_data (s)->dynindx; |
| 12388 | if (dynindx <= 0) |
| 12389 | continue; |
| 12390 | indx = elf_section_data (s)->this_idx; |
| 12391 | BFD_ASSERT (indx > 0); |
| 12392 | sym.st_shndx = indx; |
| 12393 | if (! check_dynsym (abfd, &sym)) |
| 12394 | return FALSE; |
| 12395 | sym.st_value = s->vma; |
| 12396 | dest = dynsym + dynindx * bed->s->sizeof_sym; |
| 12397 | bed->s->swap_symbol_out (abfd, &sym, dest, 0); |
| 12398 | } |
| 12399 | } |
| 12400 | |
| 12401 | /* Write out the local dynsyms. */ |
| 12402 | if (htab->dynlocal) |
| 12403 | { |
| 12404 | struct elf_link_local_dynamic_entry *e; |
| 12405 | for (e = htab->dynlocal; e ; e = e->next) |
| 12406 | { |
| 12407 | asection *s; |
| 12408 | bfd_byte *dest; |
| 12409 | |
| 12410 | /* Copy the internal symbol and turn off visibility. |
| 12411 | Note that we saved a word of storage and overwrote |
| 12412 | the original st_name with the dynstr_index. */ |
| 12413 | sym = e->isym; |
| 12414 | sym.st_other &= ~ELF_ST_VISIBILITY (-1); |
| 12415 | |
| 12416 | s = bfd_section_from_elf_index (e->input_bfd, |
| 12417 | e->isym.st_shndx); |
| 12418 | if (s != NULL) |
| 12419 | { |
| 12420 | sym.st_shndx = |
| 12421 | elf_section_data (s->output_section)->this_idx; |
| 12422 | if (! check_dynsym (abfd, &sym)) |
| 12423 | return FALSE; |
| 12424 | sym.st_value = (s->output_section->vma |
| 12425 | + s->output_offset |
| 12426 | + e->isym.st_value); |
| 12427 | } |
| 12428 | |
| 12429 | dest = dynsym + e->dynindx * bed->s->sizeof_sym; |
| 12430 | bed->s->swap_symbol_out (abfd, &sym, dest, 0); |
| 12431 | } |
| 12432 | } |
| 12433 | } |
| 12434 | |
| 12435 | /* We get the global symbols from the hash table. */ |
| 12436 | eoinfo.failed = FALSE; |
| 12437 | eoinfo.localsyms = FALSE; |
| 12438 | eoinfo.flinfo = &flinfo; |
| 12439 | bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo); |
| 12440 | if (eoinfo.failed) |
| 12441 | return FALSE; |
| 12442 | |
| 12443 | /* If backend needs to output some symbols not present in the hash |
| 12444 | table, do it now. */ |
| 12445 | if (bed->elf_backend_output_arch_syms |
| 12446 | && (info->strip != strip_all || emit_relocs)) |
| 12447 | { |
| 12448 | typedef int (*out_sym_func) |
| 12449 | (void *, const char *, Elf_Internal_Sym *, asection *, |
| 12450 | struct elf_link_hash_entry *); |
| 12451 | |
| 12452 | if (! ((*bed->elf_backend_output_arch_syms) |
| 12453 | (abfd, info, &flinfo, |
| 12454 | (out_sym_func) elf_link_output_symstrtab))) |
| 12455 | return FALSE; |
| 12456 | } |
| 12457 | |
| 12458 | /* Finalize the .strtab section. */ |
| 12459 | _bfd_elf_strtab_finalize (flinfo.symstrtab); |
| 12460 | |
| 12461 | /* Swap out the .strtab section. */ |
| 12462 | if (!elf_link_swap_symbols_out (&flinfo)) |
| 12463 | return FALSE; |
| 12464 | |
| 12465 | /* Now we know the size of the symtab section. */ |
| 12466 | if (bfd_get_symcount (abfd) > 0) |
| 12467 | { |
| 12468 | /* Finish up and write out the symbol string table (.strtab) |
| 12469 | section. */ |
| 12470 | Elf_Internal_Shdr *symstrtab_hdr = NULL; |
| 12471 | file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size; |
| 12472 | |
| 12473 | if (elf_symtab_shndx_list (abfd)) |
| 12474 | { |
| 12475 | symtab_shndx_hdr = & elf_symtab_shndx_list (abfd)->hdr; |
| 12476 | |
| 12477 | if (symtab_shndx_hdr != NULL && symtab_shndx_hdr->sh_name != 0) |
| 12478 | { |
| 12479 | symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX; |
| 12480 | symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx); |
| 12481 | symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx); |
| 12482 | amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx); |
| 12483 | symtab_shndx_hdr->sh_size = amt; |
| 12484 | |
| 12485 | off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr, |
| 12486 | off, TRUE); |
| 12487 | |
| 12488 | if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0 |
| 12489 | || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt)) |
| 12490 | return FALSE; |
| 12491 | } |
| 12492 | } |
| 12493 | |
| 12494 | symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr; |
| 12495 | /* sh_name was set in prep_headers. */ |
| 12496 | symstrtab_hdr->sh_type = SHT_STRTAB; |
| 12497 | symstrtab_hdr->sh_flags = bed->elf_strtab_flags; |
| 12498 | symstrtab_hdr->sh_addr = 0; |
| 12499 | symstrtab_hdr->sh_size = _bfd_elf_strtab_size (flinfo.symstrtab); |
| 12500 | symstrtab_hdr->sh_entsize = 0; |
| 12501 | symstrtab_hdr->sh_link = 0; |
| 12502 | symstrtab_hdr->sh_info = 0; |
| 12503 | /* sh_offset is set just below. */ |
| 12504 | symstrtab_hdr->sh_addralign = 1; |
| 12505 | |
| 12506 | off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, |
| 12507 | off, TRUE); |
| 12508 | elf_next_file_pos (abfd) = off; |
| 12509 | |
| 12510 | if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0 |
| 12511 | || ! _bfd_elf_strtab_emit (abfd, flinfo.symstrtab)) |
| 12512 | return FALSE; |
| 12513 | } |
| 12514 | |
| 12515 | if (info->out_implib_bfd && !elf_output_implib (abfd, info)) |
| 12516 | { |
| 12517 | _bfd_error_handler (_("%pB: failed to generate import library"), |
| 12518 | info->out_implib_bfd); |
| 12519 | return FALSE; |
| 12520 | } |
| 12521 | |
| 12522 | /* Adjust the relocs to have the correct symbol indices. */ |
| 12523 | for (o = abfd->sections; o != NULL; o = o->next) |
| 12524 | { |
| 12525 | struct bfd_elf_section_data *esdo = elf_section_data (o); |
| 12526 | bfd_boolean sort; |
| 12527 | |
| 12528 | if ((o->flags & SEC_RELOC) == 0) |
| 12529 | continue; |
| 12530 | |
| 12531 | sort = bed->sort_relocs_p == NULL || (*bed->sort_relocs_p) (o); |
| 12532 | if (esdo->rel.hdr != NULL |
| 12533 | && !elf_link_adjust_relocs (abfd, o, &esdo->rel, sort, info)) |
| 12534 | return FALSE; |
| 12535 | if (esdo->rela.hdr != NULL |
| 12536 | && !elf_link_adjust_relocs (abfd, o, &esdo->rela, sort, info)) |
| 12537 | return FALSE; |
| 12538 | |
| 12539 | /* Set the reloc_count field to 0 to prevent write_relocs from |
| 12540 | trying to swap the relocs out itself. */ |
| 12541 | o->reloc_count = 0; |
| 12542 | } |
| 12543 | |
| 12544 | if (dynamic && info->combreloc && dynobj != NULL) |
| 12545 | relativecount = elf_link_sort_relocs (abfd, info, &reldyn); |
| 12546 | |
| 12547 | /* If we are linking against a dynamic object, or generating a |
| 12548 | shared library, finish up the dynamic linking information. */ |
| 12549 | if (dynamic) |
| 12550 | { |
| 12551 | bfd_byte *dyncon, *dynconend; |
| 12552 | |
| 12553 | /* Fix up .dynamic entries. */ |
| 12554 | o = bfd_get_linker_section (dynobj, ".dynamic"); |
| 12555 | BFD_ASSERT (o != NULL); |
| 12556 | |
| 12557 | dyncon = o->contents; |
| 12558 | dynconend = o->contents + o->size; |
| 12559 | for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn) |
| 12560 | { |
| 12561 | Elf_Internal_Dyn dyn; |
| 12562 | const char *name; |
| 12563 | unsigned int type; |
| 12564 | bfd_size_type sh_size; |
| 12565 | bfd_vma sh_addr; |
| 12566 | |
| 12567 | bed->s->swap_dyn_in (dynobj, dyncon, &dyn); |
| 12568 | |
| 12569 | switch (dyn.d_tag) |
| 12570 | { |
| 12571 | default: |
| 12572 | continue; |
| 12573 | case DT_NULL: |
| 12574 | if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend) |
| 12575 | { |
| 12576 | switch (elf_section_data (reldyn)->this_hdr.sh_type) |
| 12577 | { |
| 12578 | case SHT_REL: dyn.d_tag = DT_RELCOUNT; break; |
| 12579 | case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break; |
| 12580 | default: continue; |
| 12581 | } |
| 12582 | dyn.d_un.d_val = relativecount; |
| 12583 | relativecount = 0; |
| 12584 | break; |
| 12585 | } |
| 12586 | continue; |
| 12587 | |
| 12588 | case DT_INIT: |
| 12589 | name = info->init_function; |
| 12590 | goto get_sym; |
| 12591 | case DT_FINI: |
| 12592 | name = info->fini_function; |
| 12593 | get_sym: |
| 12594 | { |
| 12595 | struct elf_link_hash_entry *h; |
| 12596 | |
| 12597 | h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE); |
| 12598 | if (h != NULL |
| 12599 | && (h->root.type == bfd_link_hash_defined |
| 12600 | || h->root.type == bfd_link_hash_defweak)) |
| 12601 | { |
| 12602 | dyn.d_un.d_ptr = h->root.u.def.value; |
| 12603 | o = h->root.u.def.section; |
| 12604 | if (o->output_section != NULL) |
| 12605 | dyn.d_un.d_ptr += (o->output_section->vma |
| 12606 | + o->output_offset); |
| 12607 | else |
| 12608 | { |
| 12609 | /* The symbol is imported from another shared |
| 12610 | library and does not apply to this one. */ |
| 12611 | dyn.d_un.d_ptr = 0; |
| 12612 | } |
| 12613 | break; |
| 12614 | } |
| 12615 | } |
| 12616 | continue; |
| 12617 | |
| 12618 | case DT_PREINIT_ARRAYSZ: |
| 12619 | name = ".preinit_array"; |
| 12620 | goto get_out_size; |
| 12621 | case DT_INIT_ARRAYSZ: |
| 12622 | name = ".init_array"; |
| 12623 | goto get_out_size; |
| 12624 | case DT_FINI_ARRAYSZ: |
| 12625 | name = ".fini_array"; |
| 12626 | get_out_size: |
| 12627 | o = bfd_get_section_by_name (abfd, name); |
| 12628 | if (o == NULL) |
| 12629 | { |
| 12630 | _bfd_error_handler |
| 12631 | (_("could not find section %s"), name); |
| 12632 | goto error_return; |
| 12633 | } |
| 12634 | if (o->size == 0) |
| 12635 | _bfd_error_handler |
| 12636 | (_("warning: %s section has zero size"), name); |
| 12637 | dyn.d_un.d_val = o->size; |
| 12638 | break; |
| 12639 | |
| 12640 | case DT_PREINIT_ARRAY: |
| 12641 | name = ".preinit_array"; |
| 12642 | goto get_out_vma; |
| 12643 | case DT_INIT_ARRAY: |
| 12644 | name = ".init_array"; |
| 12645 | goto get_out_vma; |
| 12646 | case DT_FINI_ARRAY: |
| 12647 | name = ".fini_array"; |
| 12648 | get_out_vma: |
| 12649 | o = bfd_get_section_by_name (abfd, name); |
| 12650 | goto do_vma; |
| 12651 | |
| 12652 | case DT_HASH: |
| 12653 | name = ".hash"; |
| 12654 | goto get_vma; |
| 12655 | case DT_GNU_HASH: |
| 12656 | name = ".gnu.hash"; |
| 12657 | goto get_vma; |
| 12658 | case DT_STRTAB: |
| 12659 | name = ".dynstr"; |
| 12660 | goto get_vma; |
| 12661 | case DT_SYMTAB: |
| 12662 | name = ".dynsym"; |
| 12663 | goto get_vma; |
| 12664 | case DT_VERDEF: |
| 12665 | name = ".gnu.version_d"; |
| 12666 | goto get_vma; |
| 12667 | case DT_VERNEED: |
| 12668 | name = ".gnu.version_r"; |
| 12669 | goto get_vma; |
| 12670 | case DT_VERSYM: |
| 12671 | name = ".gnu.version"; |
| 12672 | get_vma: |
| 12673 | o = bfd_get_linker_section (dynobj, name); |
| 12674 | do_vma: |
| 12675 | if (o == NULL || bfd_is_abs_section (o->output_section)) |
| 12676 | { |
| 12677 | _bfd_error_handler |
| 12678 | (_("could not find section %s"), name); |
| 12679 | goto error_return; |
| 12680 | } |
| 12681 | if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE) |
| 12682 | { |
| 12683 | _bfd_error_handler |
| 12684 | (_("warning: section '%s' is being made into a note"), name); |
| 12685 | bfd_set_error (bfd_error_nonrepresentable_section); |
| 12686 | goto error_return; |
| 12687 | } |
| 12688 | dyn.d_un.d_ptr = o->output_section->vma + o->output_offset; |
| 12689 | break; |
| 12690 | |
| 12691 | case DT_REL: |
| 12692 | case DT_RELA: |
| 12693 | case DT_RELSZ: |
| 12694 | case DT_RELASZ: |
| 12695 | if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ) |
| 12696 | type = SHT_REL; |
| 12697 | else |
| 12698 | type = SHT_RELA; |
| 12699 | sh_size = 0; |
| 12700 | sh_addr = 0; |
| 12701 | for (i = 1; i < elf_numsections (abfd); i++) |
| 12702 | { |
| 12703 | Elf_Internal_Shdr *hdr; |
| 12704 | |
| 12705 | hdr = elf_elfsections (abfd)[i]; |
| 12706 | if (hdr->sh_type == type |
| 12707 | && (hdr->sh_flags & SHF_ALLOC) != 0) |
| 12708 | { |
| 12709 | sh_size += hdr->sh_size; |
| 12710 | if (sh_addr == 0 |
| 12711 | || sh_addr > hdr->sh_addr) |
| 12712 | sh_addr = hdr->sh_addr; |
| 12713 | } |
| 12714 | } |
| 12715 | |
| 12716 | if (bed->dtrel_excludes_plt && htab->srelplt != NULL) |
| 12717 | { |
| 12718 | /* Don't count procedure linkage table relocs in the |
| 12719 | overall reloc count. */ |
| 12720 | sh_size -= htab->srelplt->size; |
| 12721 | if (sh_size == 0) |
| 12722 | /* If the size is zero, make the address zero too. |
| 12723 | This is to avoid a glibc bug. If the backend |
| 12724 | emits DT_RELA/DT_RELASZ even when DT_RELASZ is |
| 12725 | zero, then we'll put DT_RELA at the end of |
| 12726 | DT_JMPREL. glibc will interpret the end of |
| 12727 | DT_RELA matching the end of DT_JMPREL as the |
| 12728 | case where DT_RELA includes DT_JMPREL, and for |
| 12729 | LD_BIND_NOW will decide that processing DT_RELA |
| 12730 | will process the PLT relocs too. Net result: |
| 12731 | No PLT relocs applied. */ |
| 12732 | sh_addr = 0; |
| 12733 | |
| 12734 | /* If .rela.plt is the first .rela section, exclude |
| 12735 | it from DT_RELA. */ |
| 12736 | else if (sh_addr == (htab->srelplt->output_section->vma |
| 12737 | + htab->srelplt->output_offset)) |
| 12738 | sh_addr += htab->srelplt->size; |
| 12739 | } |
| 12740 | |
| 12741 | if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ) |
| 12742 | dyn.d_un.d_val = sh_size; |
| 12743 | else |
| 12744 | dyn.d_un.d_ptr = sh_addr; |
| 12745 | break; |
| 12746 | } |
| 12747 | bed->s->swap_dyn_out (dynobj, &dyn, dyncon); |
| 12748 | } |
| 12749 | } |
| 12750 | |
| 12751 | /* If we have created any dynamic sections, then output them. */ |
| 12752 | if (dynobj != NULL) |
| 12753 | { |
| 12754 | if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info)) |
| 12755 | goto error_return; |
| 12756 | |
| 12757 | /* Check for DT_TEXTREL (late, in case the backend removes it). */ |
| 12758 | if (((info->warn_shared_textrel && bfd_link_pic (info)) |
| 12759 | || info->error_textrel) |
| 12760 | && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL) |
| 12761 | { |
| 12762 | bfd_byte *dyncon, *dynconend; |
| 12763 | |
| 12764 | dyncon = o->contents; |
| 12765 | dynconend = o->contents + o->size; |
| 12766 | for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn) |
| 12767 | { |
| 12768 | Elf_Internal_Dyn dyn; |
| 12769 | |
| 12770 | bed->s->swap_dyn_in (dynobj, dyncon, &dyn); |
| 12771 | |
| 12772 | if (dyn.d_tag == DT_TEXTREL) |
| 12773 | { |
| 12774 | if (info->error_textrel) |
| 12775 | info->callbacks->einfo |
| 12776 | (_("%P%X: read-only segment has dynamic relocations\n")); |
| 12777 | else |
| 12778 | info->callbacks->einfo |
| 12779 | (_("%P: warning: creating a DT_TEXTREL in a shared object\n")); |
| 12780 | break; |
| 12781 | } |
| 12782 | } |
| 12783 | } |
| 12784 | |
| 12785 | for (o = dynobj->sections; o != NULL; o = o->next) |
| 12786 | { |
| 12787 | if ((o->flags & SEC_HAS_CONTENTS) == 0 |
| 12788 | || o->size == 0 |
| 12789 | || o->output_section == bfd_abs_section_ptr) |
| 12790 | continue; |
| 12791 | if ((o->flags & SEC_LINKER_CREATED) == 0) |
| 12792 | { |
| 12793 | /* At this point, we are only interested in sections |
| 12794 | created by _bfd_elf_link_create_dynamic_sections. */ |
| 12795 | continue; |
| 12796 | } |
| 12797 | if (htab->stab_info.stabstr == o) |
| 12798 | continue; |
| 12799 | if (htab->eh_info.hdr_sec == o) |
| 12800 | continue; |
| 12801 | if (strcmp (o->name, ".dynstr") != 0) |
| 12802 | { |
| 12803 | if (! bfd_set_section_contents (abfd, o->output_section, |
| 12804 | o->contents, |
| 12805 | (file_ptr) o->output_offset |
| 12806 | * bfd_octets_per_byte (abfd), |
| 12807 | o->size)) |
| 12808 | goto error_return; |
| 12809 | } |
| 12810 | else |
| 12811 | { |
| 12812 | /* The contents of the .dynstr section are actually in a |
| 12813 | stringtab. */ |
| 12814 | file_ptr off; |
| 12815 | |
| 12816 | off = elf_section_data (o->output_section)->this_hdr.sh_offset; |
| 12817 | if (bfd_seek (abfd, off, SEEK_SET) != 0 |
| 12818 | || !_bfd_elf_strtab_emit (abfd, htab->dynstr)) |
| 12819 | goto error_return; |
| 12820 | } |
| 12821 | } |
| 12822 | } |
| 12823 | |
| 12824 | if (!info->resolve_section_groups) |
| 12825 | { |
| 12826 | bfd_boolean failed = FALSE; |
| 12827 | |
| 12828 | BFD_ASSERT (bfd_link_relocatable (info)); |
| 12829 | bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed); |
| 12830 | if (failed) |
| 12831 | goto error_return; |
| 12832 | } |
| 12833 | |
| 12834 | /* If we have optimized stabs strings, output them. */ |
| 12835 | if (htab->stab_info.stabstr != NULL) |
| 12836 | { |
| 12837 | if (!_bfd_write_stab_strings (abfd, &htab->stab_info)) |
| 12838 | goto error_return; |
| 12839 | } |
| 12840 | |
| 12841 | if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info)) |
| 12842 | goto error_return; |
| 12843 | |
| 12844 | elf_final_link_free (abfd, &flinfo); |
| 12845 | |
| 12846 | if (attr_section) |
| 12847 | { |
| 12848 | bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size); |
| 12849 | if (contents == NULL) |
| 12850 | return FALSE; /* Bail out and fail. */ |
| 12851 | bfd_elf_set_obj_attr_contents (abfd, contents, attr_size); |
| 12852 | bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size); |
| 12853 | free (contents); |
| 12854 | } |
| 12855 | |
| 12856 | return TRUE; |
| 12857 | |
| 12858 | error_return: |
| 12859 | elf_final_link_free (abfd, &flinfo); |
| 12860 | return FALSE; |
| 12861 | } |
| 12862 | \f |
| 12863 | /* Initialize COOKIE for input bfd ABFD. */ |
| 12864 | |
| 12865 | static bfd_boolean |
| 12866 | init_reloc_cookie (struct elf_reloc_cookie *cookie, |
| 12867 | struct bfd_link_info *info, bfd *abfd) |
| 12868 | { |
| 12869 | Elf_Internal_Shdr *symtab_hdr; |
| 12870 | const struct elf_backend_data *bed; |
| 12871 | |
| 12872 | bed = get_elf_backend_data (abfd); |
| 12873 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 12874 | |
| 12875 | cookie->abfd = abfd; |
| 12876 | cookie->sym_hashes = elf_sym_hashes (abfd); |
| 12877 | cookie->bad_symtab = elf_bad_symtab (abfd); |
| 12878 | if (cookie->bad_symtab) |
| 12879 | { |
| 12880 | cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym; |
| 12881 | cookie->extsymoff = 0; |
| 12882 | } |
| 12883 | else |
| 12884 | { |
| 12885 | cookie->locsymcount = symtab_hdr->sh_info; |
| 12886 | cookie->extsymoff = symtab_hdr->sh_info; |
| 12887 | } |
| 12888 | |
| 12889 | if (bed->s->arch_size == 32) |
| 12890 | cookie->r_sym_shift = 8; |
| 12891 | else |
| 12892 | cookie->r_sym_shift = 32; |
| 12893 | |
| 12894 | cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 12895 | if (cookie->locsyms == NULL && cookie->locsymcount != 0) |
| 12896 | { |
| 12897 | cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 12898 | cookie->locsymcount, 0, |
| 12899 | NULL, NULL, NULL); |
| 12900 | if (cookie->locsyms == NULL) |
| 12901 | { |
| 12902 | info->callbacks->einfo (_("%P%X: can not read symbols: %E\n")); |
| 12903 | return FALSE; |
| 12904 | } |
| 12905 | if (info->keep_memory) |
| 12906 | symtab_hdr->contents = (bfd_byte *) cookie->locsyms; |
| 12907 | } |
| 12908 | return TRUE; |
| 12909 | } |
| 12910 | |
| 12911 | /* Free the memory allocated by init_reloc_cookie, if appropriate. */ |
| 12912 | |
| 12913 | static void |
| 12914 | fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd) |
| 12915 | { |
| 12916 | Elf_Internal_Shdr *symtab_hdr; |
| 12917 | |
| 12918 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 12919 | if (cookie->locsyms != NULL |
| 12920 | && symtab_hdr->contents != (unsigned char *) cookie->locsyms) |
| 12921 | free (cookie->locsyms); |
| 12922 | } |
| 12923 | |
| 12924 | /* Initialize the relocation information in COOKIE for input section SEC |
| 12925 | of input bfd ABFD. */ |
| 12926 | |
| 12927 | static bfd_boolean |
| 12928 | init_reloc_cookie_rels (struct elf_reloc_cookie *cookie, |
| 12929 | struct bfd_link_info *info, bfd *abfd, |
| 12930 | asection *sec) |
| 12931 | { |
| 12932 | if (sec->reloc_count == 0) |
| 12933 | { |
| 12934 | cookie->rels = NULL; |
| 12935 | cookie->relend = NULL; |
| 12936 | } |
| 12937 | else |
| 12938 | { |
| 12939 | cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, |
| 12940 | info->keep_memory); |
| 12941 | if (cookie->rels == NULL) |
| 12942 | return FALSE; |
| 12943 | cookie->rel = cookie->rels; |
| 12944 | cookie->relend = cookie->rels + sec->reloc_count; |
| 12945 | } |
| 12946 | cookie->rel = cookie->rels; |
| 12947 | return TRUE; |
| 12948 | } |
| 12949 | |
| 12950 | /* Free the memory allocated by init_reloc_cookie_rels, |
| 12951 | if appropriate. */ |
| 12952 | |
| 12953 | static void |
| 12954 | fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie, |
| 12955 | asection *sec) |
| 12956 | { |
| 12957 | if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels) |
| 12958 | free (cookie->rels); |
| 12959 | } |
| 12960 | |
| 12961 | /* Initialize the whole of COOKIE for input section SEC. */ |
| 12962 | |
| 12963 | static bfd_boolean |
| 12964 | init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie, |
| 12965 | struct bfd_link_info *info, |
| 12966 | asection *sec) |
| 12967 | { |
| 12968 | if (!init_reloc_cookie (cookie, info, sec->owner)) |
| 12969 | goto error1; |
| 12970 | if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec)) |
| 12971 | goto error2; |
| 12972 | return TRUE; |
| 12973 | |
| 12974 | error2: |
| 12975 | fini_reloc_cookie (cookie, sec->owner); |
| 12976 | error1: |
| 12977 | return FALSE; |
| 12978 | } |
| 12979 | |
| 12980 | /* Free the memory allocated by init_reloc_cookie_for_section, |
| 12981 | if appropriate. */ |
| 12982 | |
| 12983 | static void |
| 12984 | fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie, |
| 12985 | asection *sec) |
| 12986 | { |
| 12987 | fini_reloc_cookie_rels (cookie, sec); |
| 12988 | fini_reloc_cookie (cookie, sec->owner); |
| 12989 | } |
| 12990 | \f |
| 12991 | /* Garbage collect unused sections. */ |
| 12992 | |
| 12993 | /* Default gc_mark_hook. */ |
| 12994 | |
| 12995 | asection * |
| 12996 | _bfd_elf_gc_mark_hook (asection *sec, |
| 12997 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 12998 | Elf_Internal_Rela *rel ATTRIBUTE_UNUSED, |
| 12999 | struct elf_link_hash_entry *h, |
| 13000 | Elf_Internal_Sym *sym) |
| 13001 | { |
| 13002 | if (h != NULL) |
| 13003 | { |
| 13004 | switch (h->root.type) |
| 13005 | { |
| 13006 | case bfd_link_hash_defined: |
| 13007 | case bfd_link_hash_defweak: |
| 13008 | return h->root.u.def.section; |
| 13009 | |
| 13010 | case bfd_link_hash_common: |
| 13011 | return h->root.u.c.p->section; |
| 13012 | |
| 13013 | default: |
| 13014 | break; |
| 13015 | } |
| 13016 | } |
| 13017 | else |
| 13018 | return bfd_section_from_elf_index (sec->owner, sym->st_shndx); |
| 13019 | |
| 13020 | return NULL; |
| 13021 | } |
| 13022 | |
| 13023 | /* Return the debug definition section. */ |
| 13024 | |
| 13025 | static asection * |
| 13026 | elf_gc_mark_debug_section (asection *sec ATTRIBUTE_UNUSED, |
| 13027 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 13028 | Elf_Internal_Rela *rel ATTRIBUTE_UNUSED, |
| 13029 | struct elf_link_hash_entry *h, |
| 13030 | Elf_Internal_Sym *sym) |
| 13031 | { |
| 13032 | if (h != NULL) |
| 13033 | { |
| 13034 | /* Return the global debug definition section. */ |
| 13035 | if ((h->root.type == bfd_link_hash_defined |
| 13036 | || h->root.type == bfd_link_hash_defweak) |
| 13037 | && (h->root.u.def.section->flags & SEC_DEBUGGING) != 0) |
| 13038 | return h->root.u.def.section; |
| 13039 | } |
| 13040 | else |
| 13041 | { |
| 13042 | /* Return the local debug definition section. */ |
| 13043 | asection *isec = bfd_section_from_elf_index (sec->owner, |
| 13044 | sym->st_shndx); |
| 13045 | if ((isec->flags & SEC_DEBUGGING) != 0) |
| 13046 | return isec; |
| 13047 | } |
| 13048 | |
| 13049 | return NULL; |
| 13050 | } |
| 13051 | |
| 13052 | /* COOKIE->rel describes a relocation against section SEC, which is |
| 13053 | a section we've decided to keep. Return the section that contains |
| 13054 | the relocation symbol, or NULL if no section contains it. */ |
| 13055 | |
| 13056 | asection * |
| 13057 | _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec, |
| 13058 | elf_gc_mark_hook_fn gc_mark_hook, |
| 13059 | struct elf_reloc_cookie *cookie, |
| 13060 | bfd_boolean *start_stop) |
| 13061 | { |
| 13062 | unsigned long r_symndx; |
| 13063 | struct elf_link_hash_entry *h; |
| 13064 | |
| 13065 | r_symndx = cookie->rel->r_info >> cookie->r_sym_shift; |
| 13066 | if (r_symndx == STN_UNDEF) |
| 13067 | return NULL; |
| 13068 | |
| 13069 | if (r_symndx >= cookie->locsymcount |
| 13070 | || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL) |
| 13071 | { |
| 13072 | h = cookie->sym_hashes[r_symndx - cookie->extsymoff]; |
| 13073 | if (h == NULL) |
| 13074 | { |
| 13075 | info->callbacks->einfo (_("%F%P: corrupt input: %pB\n"), |
| 13076 | sec->owner); |
| 13077 | return NULL; |
| 13078 | } |
| 13079 | while (h->root.type == bfd_link_hash_indirect |
| 13080 | || h->root.type == bfd_link_hash_warning) |
| 13081 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 13082 | h->mark = 1; |
| 13083 | /* If this symbol is weak and there is a non-weak definition, we |
| 13084 | keep the non-weak definition because many backends put |
| 13085 | dynamic reloc info on the non-weak definition for code |
| 13086 | handling copy relocs. */ |
| 13087 | if (h->is_weakalias) |
| 13088 | weakdef (h)->mark = 1; |
| 13089 | |
| 13090 | if (start_stop != NULL) |
| 13091 | { |
| 13092 | /* To work around a glibc bug, mark XXX input sections |
| 13093 | when there is a reference to __start_XXX or __stop_XXX |
| 13094 | symbols. */ |
| 13095 | if (h->start_stop) |
| 13096 | { |
| 13097 | asection *s = h->u2.start_stop_section; |
| 13098 | *start_stop = !s->gc_mark; |
| 13099 | return s; |
| 13100 | } |
| 13101 | } |
| 13102 | |
| 13103 | return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL); |
| 13104 | } |
| 13105 | |
| 13106 | return (*gc_mark_hook) (sec, info, cookie->rel, NULL, |
| 13107 | &cookie->locsyms[r_symndx]); |
| 13108 | } |
| 13109 | |
| 13110 | /* COOKIE->rel describes a relocation against section SEC, which is |
| 13111 | a section we've decided to keep. Mark the section that contains |
| 13112 | the relocation symbol. */ |
| 13113 | |
| 13114 | bfd_boolean |
| 13115 | _bfd_elf_gc_mark_reloc (struct bfd_link_info *info, |
| 13116 | asection *sec, |
| 13117 | elf_gc_mark_hook_fn gc_mark_hook, |
| 13118 | struct elf_reloc_cookie *cookie) |
| 13119 | { |
| 13120 | asection *rsec; |
| 13121 | bfd_boolean start_stop = FALSE; |
| 13122 | |
| 13123 | rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie, &start_stop); |
| 13124 | while (rsec != NULL) |
| 13125 | { |
| 13126 | if (!rsec->gc_mark) |
| 13127 | { |
| 13128 | if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour |
| 13129 | || (rsec->owner->flags & DYNAMIC) != 0) |
| 13130 | rsec->gc_mark = 1; |
| 13131 | else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook)) |
| 13132 | return FALSE; |
| 13133 | } |
| 13134 | if (!start_stop) |
| 13135 | break; |
| 13136 | rsec = bfd_get_next_section_by_name (rsec->owner, rsec); |
| 13137 | } |
| 13138 | return TRUE; |
| 13139 | } |
| 13140 | |
| 13141 | /* The mark phase of garbage collection. For a given section, mark |
| 13142 | it and any sections in this section's group, and all the sections |
| 13143 | which define symbols to which it refers. */ |
| 13144 | |
| 13145 | bfd_boolean |
| 13146 | _bfd_elf_gc_mark (struct bfd_link_info *info, |
| 13147 | asection *sec, |
| 13148 | elf_gc_mark_hook_fn gc_mark_hook) |
| 13149 | { |
| 13150 | bfd_boolean ret; |
| 13151 | asection *group_sec, *eh_frame; |
| 13152 | |
| 13153 | sec->gc_mark = 1; |
| 13154 | |
| 13155 | /* Mark all the sections in the group. */ |
| 13156 | group_sec = elf_section_data (sec)->next_in_group; |
| 13157 | if (group_sec && !group_sec->gc_mark) |
| 13158 | if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook)) |
| 13159 | return FALSE; |
| 13160 | |
| 13161 | /* Look through the section relocs. */ |
| 13162 | ret = TRUE; |
| 13163 | eh_frame = elf_eh_frame_section (sec->owner); |
| 13164 | if ((sec->flags & SEC_RELOC) != 0 |
| 13165 | && sec->reloc_count > 0 |
| 13166 | && sec != eh_frame) |
| 13167 | { |
| 13168 | struct elf_reloc_cookie cookie; |
| 13169 | |
| 13170 | if (!init_reloc_cookie_for_section (&cookie, info, sec)) |
| 13171 | ret = FALSE; |
| 13172 | else |
| 13173 | { |
| 13174 | for (; cookie.rel < cookie.relend; cookie.rel++) |
| 13175 | if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie)) |
| 13176 | { |
| 13177 | ret = FALSE; |
| 13178 | break; |
| 13179 | } |
| 13180 | fini_reloc_cookie_for_section (&cookie, sec); |
| 13181 | } |
| 13182 | } |
| 13183 | |
| 13184 | if (ret && eh_frame && elf_fde_list (sec)) |
| 13185 | { |
| 13186 | struct elf_reloc_cookie cookie; |
| 13187 | |
| 13188 | if (!init_reloc_cookie_for_section (&cookie, info, eh_frame)) |
| 13189 | ret = FALSE; |
| 13190 | else |
| 13191 | { |
| 13192 | if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame, |
| 13193 | gc_mark_hook, &cookie)) |
| 13194 | ret = FALSE; |
| 13195 | fini_reloc_cookie_for_section (&cookie, eh_frame); |
| 13196 | } |
| 13197 | } |
| 13198 | |
| 13199 | eh_frame = elf_section_eh_frame_entry (sec); |
| 13200 | if (ret && eh_frame && !eh_frame->gc_mark) |
| 13201 | if (!_bfd_elf_gc_mark (info, eh_frame, gc_mark_hook)) |
| 13202 | ret = FALSE; |
| 13203 | |
| 13204 | return ret; |
| 13205 | } |
| 13206 | |
| 13207 | /* Scan and mark sections in a special or debug section group. */ |
| 13208 | |
| 13209 | static void |
| 13210 | _bfd_elf_gc_mark_debug_special_section_group (asection *grp) |
| 13211 | { |
| 13212 | /* Point to first section of section group. */ |
| 13213 | asection *ssec; |
| 13214 | /* Used to iterate the section group. */ |
| 13215 | asection *msec; |
| 13216 | |
| 13217 | bfd_boolean is_special_grp = TRUE; |
| 13218 | bfd_boolean is_debug_grp = TRUE; |
| 13219 | |
| 13220 | /* First scan to see if group contains any section other than debug |
| 13221 | and special section. */ |
| 13222 | ssec = msec = elf_next_in_group (grp); |
| 13223 | do |
| 13224 | { |
| 13225 | if ((msec->flags & SEC_DEBUGGING) == 0) |
| 13226 | is_debug_grp = FALSE; |
| 13227 | |
| 13228 | if ((msec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) != 0) |
| 13229 | is_special_grp = FALSE; |
| 13230 | |
| 13231 | msec = elf_next_in_group (msec); |
| 13232 | } |
| 13233 | while (msec != ssec); |
| 13234 | |
| 13235 | /* If this is a pure debug section group or pure special section group, |
| 13236 | keep all sections in this group. */ |
| 13237 | if (is_debug_grp || is_special_grp) |
| 13238 | { |
| 13239 | do |
| 13240 | { |
| 13241 | msec->gc_mark = 1; |
| 13242 | msec = elf_next_in_group (msec); |
| 13243 | } |
| 13244 | while (msec != ssec); |
| 13245 | } |
| 13246 | } |
| 13247 | |
| 13248 | /* Keep debug and special sections. */ |
| 13249 | |
| 13250 | bfd_boolean |
| 13251 | _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info, |
| 13252 | elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED) |
| 13253 | { |
| 13254 | bfd *ibfd; |
| 13255 | |
| 13256 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) |
| 13257 | { |
| 13258 | asection *isec; |
| 13259 | bfd_boolean some_kept; |
| 13260 | bfd_boolean debug_frag_seen; |
| 13261 | bfd_boolean has_kept_debug_info; |
| 13262 | |
| 13263 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
| 13264 | continue; |
| 13265 | isec = ibfd->sections; |
| 13266 | if (isec == NULL || isec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS) |
| 13267 | continue; |
| 13268 | |
| 13269 | /* Ensure all linker created sections are kept, |
| 13270 | see if any other section is already marked, |
| 13271 | and note if we have any fragmented debug sections. */ |
| 13272 | debug_frag_seen = some_kept = has_kept_debug_info = FALSE; |
| 13273 | for (isec = ibfd->sections; isec != NULL; isec = isec->next) |
| 13274 | { |
| 13275 | if ((isec->flags & SEC_LINKER_CREATED) != 0) |
| 13276 | isec->gc_mark = 1; |
| 13277 | else if (isec->gc_mark |
| 13278 | && (isec->flags & SEC_ALLOC) != 0 |
| 13279 | && elf_section_type (isec) != SHT_NOTE) |
| 13280 | some_kept = TRUE; |
| 13281 | |
| 13282 | if (!debug_frag_seen |
| 13283 | && (isec->flags & SEC_DEBUGGING) |
| 13284 | && CONST_STRNEQ (isec->name, ".debug_line.")) |
| 13285 | debug_frag_seen = TRUE; |
| 13286 | } |
| 13287 | |
| 13288 | /* If no non-note alloc section in this file will be kept, then |
| 13289 | we can toss out the debug and special sections. */ |
| 13290 | if (!some_kept) |
| 13291 | continue; |
| 13292 | |
| 13293 | /* Keep debug and special sections like .comment when they are |
| 13294 | not part of a group. Also keep section groups that contain |
| 13295 | just debug sections or special sections. */ |
| 13296 | for (isec = ibfd->sections; isec != NULL; isec = isec->next) |
| 13297 | { |
| 13298 | if ((isec->flags & SEC_GROUP) != 0) |
| 13299 | _bfd_elf_gc_mark_debug_special_section_group (isec); |
| 13300 | else if (((isec->flags & SEC_DEBUGGING) != 0 |
| 13301 | || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0) |
| 13302 | && elf_next_in_group (isec) == NULL) |
| 13303 | isec->gc_mark = 1; |
| 13304 | if (isec->gc_mark && (isec->flags & SEC_DEBUGGING) != 0) |
| 13305 | has_kept_debug_info = TRUE; |
| 13306 | } |
| 13307 | |
| 13308 | /* Look for CODE sections which are going to be discarded, |
| 13309 | and find and discard any fragmented debug sections which |
| 13310 | are associated with that code section. */ |
| 13311 | if (debug_frag_seen) |
| 13312 | for (isec = ibfd->sections; isec != NULL; isec = isec->next) |
| 13313 | if ((isec->flags & SEC_CODE) != 0 |
| 13314 | && isec->gc_mark == 0) |
| 13315 | { |
| 13316 | unsigned int ilen; |
| 13317 | asection *dsec; |
| 13318 | |
| 13319 | ilen = strlen (isec->name); |
| 13320 | |
| 13321 | /* Association is determined by the name of the debug |
| 13322 | section containing the name of the code section as |
| 13323 | a suffix. For example .debug_line.text.foo is a |
| 13324 | debug section associated with .text.foo. */ |
| 13325 | for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next) |
| 13326 | { |
| 13327 | unsigned int dlen; |
| 13328 | |
| 13329 | if (dsec->gc_mark == 0 |
| 13330 | || (dsec->flags & SEC_DEBUGGING) == 0) |
| 13331 | continue; |
| 13332 | |
| 13333 | dlen = strlen (dsec->name); |
| 13334 | |
| 13335 | if (dlen > ilen |
| 13336 | && strncmp (dsec->name + (dlen - ilen), |
| 13337 | isec->name, ilen) == 0) |
| 13338 | dsec->gc_mark = 0; |
| 13339 | } |
| 13340 | } |
| 13341 | |
| 13342 | /* Mark debug sections referenced by kept debug sections. */ |
| 13343 | if (has_kept_debug_info) |
| 13344 | for (isec = ibfd->sections; isec != NULL; isec = isec->next) |
| 13345 | if (isec->gc_mark |
| 13346 | && (isec->flags & SEC_DEBUGGING) != 0) |
| 13347 | if (!_bfd_elf_gc_mark (info, isec, |
| 13348 | elf_gc_mark_debug_section)) |
| 13349 | return FALSE; |
| 13350 | } |
| 13351 | return TRUE; |
| 13352 | } |
| 13353 | |
| 13354 | static bfd_boolean |
| 13355 | elf_gc_sweep (bfd *abfd, struct bfd_link_info *info) |
| 13356 | { |
| 13357 | bfd *sub; |
| 13358 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 13359 | |
| 13360 | for (sub = info->input_bfds; sub != NULL; sub = sub->link.next) |
| 13361 | { |
| 13362 | asection *o; |
| 13363 | |
| 13364 | if (bfd_get_flavour (sub) != bfd_target_elf_flavour |
| 13365 | || elf_object_id (sub) != elf_hash_table_id (elf_hash_table (info)) |
| 13366 | || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec)) |
| 13367 | continue; |
| 13368 | o = sub->sections; |
| 13369 | if (o == NULL || o->sec_info_type == SEC_INFO_TYPE_JUST_SYMS) |
| 13370 | continue; |
| 13371 | |
| 13372 | for (o = sub->sections; o != NULL; o = o->next) |
| 13373 | { |
| 13374 | /* When any section in a section group is kept, we keep all |
| 13375 | sections in the section group. If the first member of |
| 13376 | the section group is excluded, we will also exclude the |
| 13377 | group section. */ |
| 13378 | if (o->flags & SEC_GROUP) |
| 13379 | { |
| 13380 | asection *first = elf_next_in_group (o); |
| 13381 | o->gc_mark = first->gc_mark; |
| 13382 | } |
| 13383 | |
| 13384 | if (o->gc_mark) |
| 13385 | continue; |
| 13386 | |
| 13387 | /* Skip sweeping sections already excluded. */ |
| 13388 | if (o->flags & SEC_EXCLUDE) |
| 13389 | continue; |
| 13390 | |
| 13391 | /* Since this is early in the link process, it is simple |
| 13392 | to remove a section from the output. */ |
| 13393 | o->flags |= SEC_EXCLUDE; |
| 13394 | |
| 13395 | if (info->print_gc_sections && o->size != 0) |
| 13396 | /* xgettext:c-format */ |
| 13397 | _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"), |
| 13398 | o, sub); |
| 13399 | } |
| 13400 | } |
| 13401 | |
| 13402 | return TRUE; |
| 13403 | } |
| 13404 | |
| 13405 | /* Propagate collected vtable information. This is called through |
| 13406 | elf_link_hash_traverse. */ |
| 13407 | |
| 13408 | static bfd_boolean |
| 13409 | elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp) |
| 13410 | { |
| 13411 | /* Those that are not vtables. */ |
| 13412 | if (h->start_stop |
| 13413 | || h->u2.vtable == NULL |
| 13414 | || h->u2.vtable->parent == NULL) |
| 13415 | return TRUE; |
| 13416 | |
| 13417 | /* Those vtables that do not have parents, we cannot merge. */ |
| 13418 | if (h->u2.vtable->parent == (struct elf_link_hash_entry *) -1) |
| 13419 | return TRUE; |
| 13420 | |
| 13421 | /* If we've already been done, exit. */ |
| 13422 | if (h->u2.vtable->used && h->u2.vtable->used[-1]) |
| 13423 | return TRUE; |
| 13424 | |
| 13425 | /* Make sure the parent's table is up to date. */ |
| 13426 | elf_gc_propagate_vtable_entries_used (h->u2.vtable->parent, okp); |
| 13427 | |
| 13428 | if (h->u2.vtable->used == NULL) |
| 13429 | { |
| 13430 | /* None of this table's entries were referenced. Re-use the |
| 13431 | parent's table. */ |
| 13432 | h->u2.vtable->used = h->u2.vtable->parent->u2.vtable->used; |
| 13433 | h->u2.vtable->size = h->u2.vtable->parent->u2.vtable->size; |
| 13434 | } |
| 13435 | else |
| 13436 | { |
| 13437 | size_t n; |
| 13438 | bfd_boolean *cu, *pu; |
| 13439 | |
| 13440 | /* Or the parent's entries into ours. */ |
| 13441 | cu = h->u2.vtable->used; |
| 13442 | cu[-1] = TRUE; |
| 13443 | pu = h->u2.vtable->parent->u2.vtable->used; |
| 13444 | if (pu != NULL) |
| 13445 | { |
| 13446 | const struct elf_backend_data *bed; |
| 13447 | unsigned int log_file_align; |
| 13448 | |
| 13449 | bed = get_elf_backend_data (h->root.u.def.section->owner); |
| 13450 | log_file_align = bed->s->log_file_align; |
| 13451 | n = h->u2.vtable->parent->u2.vtable->size >> log_file_align; |
| 13452 | while (n--) |
| 13453 | { |
| 13454 | if (*pu) |
| 13455 | *cu = TRUE; |
| 13456 | pu++; |
| 13457 | cu++; |
| 13458 | } |
| 13459 | } |
| 13460 | } |
| 13461 | |
| 13462 | return TRUE; |
| 13463 | } |
| 13464 | |
| 13465 | static bfd_boolean |
| 13466 | elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp) |
| 13467 | { |
| 13468 | asection *sec; |
| 13469 | bfd_vma hstart, hend; |
| 13470 | Elf_Internal_Rela *relstart, *relend, *rel; |
| 13471 | const struct elf_backend_data *bed; |
| 13472 | unsigned int log_file_align; |
| 13473 | |
| 13474 | /* Take care of both those symbols that do not describe vtables as |
| 13475 | well as those that are not loaded. */ |
| 13476 | if (h->start_stop |
| 13477 | || h->u2.vtable == NULL |
| 13478 | || h->u2.vtable->parent == NULL) |
| 13479 | return TRUE; |
| 13480 | |
| 13481 | BFD_ASSERT (h->root.type == bfd_link_hash_defined |
| 13482 | || h->root.type == bfd_link_hash_defweak); |
| 13483 | |
| 13484 | sec = h->root.u.def.section; |
| 13485 | hstart = h->root.u.def.value; |
| 13486 | hend = hstart + h->size; |
| 13487 | |
| 13488 | relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE); |
| 13489 | if (!relstart) |
| 13490 | return *(bfd_boolean *) okp = FALSE; |
| 13491 | bed = get_elf_backend_data (sec->owner); |
| 13492 | log_file_align = bed->s->log_file_align; |
| 13493 | |
| 13494 | relend = relstart + sec->reloc_count; |
| 13495 | |
| 13496 | for (rel = relstart; rel < relend; ++rel) |
| 13497 | if (rel->r_offset >= hstart && rel->r_offset < hend) |
| 13498 | { |
| 13499 | /* If the entry is in use, do nothing. */ |
| 13500 | if (h->u2.vtable->used |
| 13501 | && (rel->r_offset - hstart) < h->u2.vtable->size) |
| 13502 | { |
| 13503 | bfd_vma entry = (rel->r_offset - hstart) >> log_file_align; |
| 13504 | if (h->u2.vtable->used[entry]) |
| 13505 | continue; |
| 13506 | } |
| 13507 | /* Otherwise, kill it. */ |
| 13508 | rel->r_offset = rel->r_info = rel->r_addend = 0; |
| 13509 | } |
| 13510 | |
| 13511 | return TRUE; |
| 13512 | } |
| 13513 | |
| 13514 | /* Mark sections containing dynamically referenced symbols. When |
| 13515 | building shared libraries, we must assume that any visible symbol is |
| 13516 | referenced. */ |
| 13517 | |
| 13518 | bfd_boolean |
| 13519 | bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf) |
| 13520 | { |
| 13521 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 13522 | struct bfd_elf_dynamic_list *d = info->dynamic_list; |
| 13523 | |
| 13524 | if ((h->root.type == bfd_link_hash_defined |
| 13525 | || h->root.type == bfd_link_hash_defweak) |
| 13526 | && ((h->ref_dynamic && !h->forced_local) |
| 13527 | || ((h->def_regular || ELF_COMMON_DEF_P (h)) |
| 13528 | && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL |
| 13529 | && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN |
| 13530 | && (!bfd_link_executable (info) |
| 13531 | || info->gc_keep_exported |
| 13532 | || info->export_dynamic |
| 13533 | || (h->dynamic |
| 13534 | && d != NULL |
| 13535 | && (*d->match) (&d->head, NULL, h->root.root.string))) |
| 13536 | && (h->versioned >= versioned |
| 13537 | || !bfd_hide_sym_by_version (info->version_info, |
| 13538 | h->root.root.string))))) |
| 13539 | h->root.u.def.section->flags |= SEC_KEEP; |
| 13540 | |
| 13541 | return TRUE; |
| 13542 | } |
| 13543 | |
| 13544 | /* Keep all sections containing symbols undefined on the command-line, |
| 13545 | and the section containing the entry symbol. */ |
| 13546 | |
| 13547 | void |
| 13548 | _bfd_elf_gc_keep (struct bfd_link_info *info) |
| 13549 | { |
| 13550 | struct bfd_sym_chain *sym; |
| 13551 | |
| 13552 | for (sym = info->gc_sym_list; sym != NULL; sym = sym->next) |
| 13553 | { |
| 13554 | struct elf_link_hash_entry *h; |
| 13555 | |
| 13556 | h = elf_link_hash_lookup (elf_hash_table (info), sym->name, |
| 13557 | FALSE, FALSE, FALSE); |
| 13558 | |
| 13559 | if (h != NULL |
| 13560 | && (h->root.type == bfd_link_hash_defined |
| 13561 | || h->root.type == bfd_link_hash_defweak) |
| 13562 | && !bfd_is_abs_section (h->root.u.def.section) |
| 13563 | && !bfd_is_und_section (h->root.u.def.section)) |
| 13564 | h->root.u.def.section->flags |= SEC_KEEP; |
| 13565 | } |
| 13566 | } |
| 13567 | |
| 13568 | bfd_boolean |
| 13569 | bfd_elf_parse_eh_frame_entries (bfd *abfd ATTRIBUTE_UNUSED, |
| 13570 | struct bfd_link_info *info) |
| 13571 | { |
| 13572 | bfd *ibfd = info->input_bfds; |
| 13573 | |
| 13574 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) |
| 13575 | { |
| 13576 | asection *sec; |
| 13577 | struct elf_reloc_cookie cookie; |
| 13578 | |
| 13579 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
| 13580 | continue; |
| 13581 | sec = ibfd->sections; |
| 13582 | if (sec == NULL || sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS) |
| 13583 | continue; |
| 13584 | |
| 13585 | if (!init_reloc_cookie (&cookie, info, ibfd)) |
| 13586 | return FALSE; |
| 13587 | |
| 13588 | for (sec = ibfd->sections; sec; sec = sec->next) |
| 13589 | { |
| 13590 | if (CONST_STRNEQ (bfd_section_name (ibfd, sec), ".eh_frame_entry") |
| 13591 | && init_reloc_cookie_rels (&cookie, info, ibfd, sec)) |
| 13592 | { |
| 13593 | _bfd_elf_parse_eh_frame_entry (info, sec, &cookie); |
| 13594 | fini_reloc_cookie_rels (&cookie, sec); |
| 13595 | } |
| 13596 | } |
| 13597 | } |
| 13598 | return TRUE; |
| 13599 | } |
| 13600 | |
| 13601 | /* Do mark and sweep of unused sections. */ |
| 13602 | |
| 13603 | bfd_boolean |
| 13604 | bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info) |
| 13605 | { |
| 13606 | bfd_boolean ok = TRUE; |
| 13607 | bfd *sub; |
| 13608 | elf_gc_mark_hook_fn gc_mark_hook; |
| 13609 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 13610 | struct elf_link_hash_table *htab; |
| 13611 | |
| 13612 | if (!bed->can_gc_sections |
| 13613 | || !is_elf_hash_table (info->hash)) |
| 13614 | { |
| 13615 | _bfd_error_handler(_("warning: gc-sections option ignored")); |
| 13616 | return TRUE; |
| 13617 | } |
| 13618 | |
| 13619 | bed->gc_keep (info); |
| 13620 | htab = elf_hash_table (info); |
| 13621 | |
| 13622 | /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section |
| 13623 | at the .eh_frame section if we can mark the FDEs individually. */ |
| 13624 | for (sub = info->input_bfds; |
| 13625 | info->eh_frame_hdr_type != COMPACT_EH_HDR && sub != NULL; |
| 13626 | sub = sub->link.next) |
| 13627 | { |
| 13628 | asection *sec; |
| 13629 | struct elf_reloc_cookie cookie; |
| 13630 | |
| 13631 | sec = sub->sections; |
| 13632 | if (sec == NULL || sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS) |
| 13633 | continue; |
| 13634 | sec = bfd_get_section_by_name (sub, ".eh_frame"); |
| 13635 | while (sec && init_reloc_cookie_for_section (&cookie, info, sec)) |
| 13636 | { |
| 13637 | _bfd_elf_parse_eh_frame (sub, info, sec, &cookie); |
| 13638 | if (elf_section_data (sec)->sec_info |
| 13639 | && (sec->flags & SEC_LINKER_CREATED) == 0) |
| 13640 | elf_eh_frame_section (sub) = sec; |
| 13641 | fini_reloc_cookie_for_section (&cookie, sec); |
| 13642 | sec = bfd_get_next_section_by_name (NULL, sec); |
| 13643 | } |
| 13644 | } |
| 13645 | |
| 13646 | /* Apply transitive closure to the vtable entry usage info. */ |
| 13647 | elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok); |
| 13648 | if (!ok) |
| 13649 | return FALSE; |
| 13650 | |
| 13651 | /* Kill the vtable relocations that were not used. */ |
| 13652 | elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok); |
| 13653 | if (!ok) |
| 13654 | return FALSE; |
| 13655 | |
| 13656 | /* Mark dynamically referenced symbols. */ |
| 13657 | if (htab->dynamic_sections_created || info->gc_keep_exported) |
| 13658 | elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info); |
| 13659 | |
| 13660 | /* Grovel through relocs to find out who stays ... */ |
| 13661 | gc_mark_hook = bed->gc_mark_hook; |
| 13662 | for (sub = info->input_bfds; sub != NULL; sub = sub->link.next) |
| 13663 | { |
| 13664 | asection *o; |
| 13665 | |
| 13666 | if (bfd_get_flavour (sub) != bfd_target_elf_flavour |
| 13667 | || elf_object_id (sub) != elf_hash_table_id (htab) |
| 13668 | || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec)) |
| 13669 | continue; |
| 13670 | |
| 13671 | o = sub->sections; |
| 13672 | if (o == NULL || o->sec_info_type == SEC_INFO_TYPE_JUST_SYMS) |
| 13673 | continue; |
| 13674 | |
| 13675 | /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep). |
| 13676 | Also treat note sections as a root, if the section is not part |
| 13677 | of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as |
| 13678 | well as FINI_ARRAY sections for ld -r. */ |
| 13679 | for (o = sub->sections; o != NULL; o = o->next) |
| 13680 | if (!o->gc_mark |
| 13681 | && (o->flags & SEC_EXCLUDE) == 0 |
| 13682 | && ((o->flags & SEC_KEEP) != 0 |
| 13683 | || (bfd_link_relocatable (info) |
| 13684 | && ((elf_section_data (o)->this_hdr.sh_type |
| 13685 | == SHT_PREINIT_ARRAY) |
| 13686 | || (elf_section_data (o)->this_hdr.sh_type |
| 13687 | == SHT_INIT_ARRAY) |
| 13688 | || (elf_section_data (o)->this_hdr.sh_type |
| 13689 | == SHT_FINI_ARRAY))) |
| 13690 | || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE |
| 13691 | && elf_next_in_group (o) == NULL ))) |
| 13692 | { |
| 13693 | if (!_bfd_elf_gc_mark (info, o, gc_mark_hook)) |
| 13694 | return FALSE; |
| 13695 | } |
| 13696 | } |
| 13697 | |
| 13698 | /* Allow the backend to mark additional target specific sections. */ |
| 13699 | bed->gc_mark_extra_sections (info, gc_mark_hook); |
| 13700 | |
| 13701 | /* ... and mark SEC_EXCLUDE for those that go. */ |
| 13702 | return elf_gc_sweep (abfd, info); |
| 13703 | } |
| 13704 | \f |
| 13705 | /* Called from check_relocs to record the existence of a VTINHERIT reloc. */ |
| 13706 | |
| 13707 | bfd_boolean |
| 13708 | bfd_elf_gc_record_vtinherit (bfd *abfd, |
| 13709 | asection *sec, |
| 13710 | struct elf_link_hash_entry *h, |
| 13711 | bfd_vma offset) |
| 13712 | { |
| 13713 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; |
| 13714 | struct elf_link_hash_entry **search, *child; |
| 13715 | size_t extsymcount; |
| 13716 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 13717 | |
| 13718 | /* The sh_info field of the symtab header tells us where the |
| 13719 | external symbols start. We don't care about the local symbols at |
| 13720 | this point. */ |
| 13721 | extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym; |
| 13722 | if (!elf_bad_symtab (abfd)) |
| 13723 | extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info; |
| 13724 | |
| 13725 | sym_hashes = elf_sym_hashes (abfd); |
| 13726 | sym_hashes_end = sym_hashes + extsymcount; |
| 13727 | |
| 13728 | /* Hunt down the child symbol, which is in this section at the same |
| 13729 | offset as the relocation. */ |
| 13730 | for (search = sym_hashes; search != sym_hashes_end; ++search) |
| 13731 | { |
| 13732 | if ((child = *search) != NULL |
| 13733 | && (child->root.type == bfd_link_hash_defined |
| 13734 | || child->root.type == bfd_link_hash_defweak) |
| 13735 | && child->root.u.def.section == sec |
| 13736 | && child->root.u.def.value == offset) |
| 13737 | goto win; |
| 13738 | } |
| 13739 | |
| 13740 | /* xgettext:c-format */ |
| 13741 | _bfd_error_handler (_("%pB: %pA+%#" PRIx64 ": no symbol found for INHERIT"), |
| 13742 | abfd, sec, (uint64_t) offset); |
| 13743 | bfd_set_error (bfd_error_invalid_operation); |
| 13744 | return FALSE; |
| 13745 | |
| 13746 | win: |
| 13747 | if (!child->u2.vtable) |
| 13748 | { |
| 13749 | child->u2.vtable = ((struct elf_link_virtual_table_entry *) |
| 13750 | bfd_zalloc (abfd, sizeof (*child->u2.vtable))); |
| 13751 | if (!child->u2.vtable) |
| 13752 | return FALSE; |
| 13753 | } |
| 13754 | if (!h) |
| 13755 | { |
| 13756 | /* This *should* only be the absolute section. It could potentially |
| 13757 | be that someone has defined a non-global vtable though, which |
| 13758 | would be bad. It isn't worth paging in the local symbols to be |
| 13759 | sure though; that case should simply be handled by the assembler. */ |
| 13760 | |
| 13761 | child->u2.vtable->parent = (struct elf_link_hash_entry *) -1; |
| 13762 | } |
| 13763 | else |
| 13764 | child->u2.vtable->parent = h; |
| 13765 | |
| 13766 | return TRUE; |
| 13767 | } |
| 13768 | |
| 13769 | /* Called from check_relocs to record the existence of a VTENTRY reloc. */ |
| 13770 | |
| 13771 | bfd_boolean |
| 13772 | bfd_elf_gc_record_vtentry (bfd *abfd, asection *sec, |
| 13773 | struct elf_link_hash_entry *h, |
| 13774 | bfd_vma addend) |
| 13775 | { |
| 13776 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 13777 | unsigned int log_file_align = bed->s->log_file_align; |
| 13778 | |
| 13779 | if (!h) |
| 13780 | { |
| 13781 | /* xgettext:c-format */ |
| 13782 | _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"), |
| 13783 | abfd, sec); |
| 13784 | bfd_set_error (bfd_error_bad_value); |
| 13785 | return FALSE; |
| 13786 | } |
| 13787 | |
| 13788 | if (!h->u2.vtable) |
| 13789 | { |
| 13790 | h->u2.vtable = ((struct elf_link_virtual_table_entry *) |
| 13791 | bfd_zalloc (abfd, sizeof (*h->u2.vtable))); |
| 13792 | if (!h->u2.vtable) |
| 13793 | return FALSE; |
| 13794 | } |
| 13795 | |
| 13796 | if (addend >= h->u2.vtable->size) |
| 13797 | { |
| 13798 | size_t size, bytes, file_align; |
| 13799 | bfd_boolean *ptr = h->u2.vtable->used; |
| 13800 | |
| 13801 | /* While the symbol is undefined, we have to be prepared to handle |
| 13802 | a zero size. */ |
| 13803 | file_align = 1 << log_file_align; |
| 13804 | if (h->root.type == bfd_link_hash_undefined) |
| 13805 | size = addend + file_align; |
| 13806 | else |
| 13807 | { |
| 13808 | size = h->size; |
| 13809 | if (addend >= size) |
| 13810 | { |
| 13811 | /* Oops! We've got a reference past the defined end of |
| 13812 | the table. This is probably a bug -- shall we warn? */ |
| 13813 | size = addend + file_align; |
| 13814 | } |
| 13815 | } |
| 13816 | size = (size + file_align - 1) & -file_align; |
| 13817 | |
| 13818 | /* Allocate one extra entry for use as a "done" flag for the |
| 13819 | consolidation pass. */ |
| 13820 | bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean); |
| 13821 | |
| 13822 | if (ptr) |
| 13823 | { |
| 13824 | ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes); |
| 13825 | |
| 13826 | if (ptr != NULL) |
| 13827 | { |
| 13828 | size_t oldbytes; |
| 13829 | |
| 13830 | oldbytes = (((h->u2.vtable->size >> log_file_align) + 1) |
| 13831 | * sizeof (bfd_boolean)); |
| 13832 | memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes); |
| 13833 | } |
| 13834 | } |
| 13835 | else |
| 13836 | ptr = (bfd_boolean *) bfd_zmalloc (bytes); |
| 13837 | |
| 13838 | if (ptr == NULL) |
| 13839 | return FALSE; |
| 13840 | |
| 13841 | /* And arrange for that done flag to be at index -1. */ |
| 13842 | h->u2.vtable->used = ptr + 1; |
| 13843 | h->u2.vtable->size = size; |
| 13844 | } |
| 13845 | |
| 13846 | h->u2.vtable->used[addend >> log_file_align] = TRUE; |
| 13847 | |
| 13848 | return TRUE; |
| 13849 | } |
| 13850 | |
| 13851 | /* Map an ELF section header flag to its corresponding string. */ |
| 13852 | typedef struct |
| 13853 | { |
| 13854 | char *flag_name; |
| 13855 | flagword flag_value; |
| 13856 | } elf_flags_to_name_table; |
| 13857 | |
| 13858 | static elf_flags_to_name_table elf_flags_to_names [] = |
| 13859 | { |
| 13860 | { "SHF_WRITE", SHF_WRITE }, |
| 13861 | { "SHF_ALLOC", SHF_ALLOC }, |
| 13862 | { "SHF_EXECINSTR", SHF_EXECINSTR }, |
| 13863 | { "SHF_MERGE", SHF_MERGE }, |
| 13864 | { "SHF_STRINGS", SHF_STRINGS }, |
| 13865 | { "SHF_INFO_LINK", SHF_INFO_LINK}, |
| 13866 | { "SHF_LINK_ORDER", SHF_LINK_ORDER}, |
| 13867 | { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING}, |
| 13868 | { "SHF_GROUP", SHF_GROUP }, |
| 13869 | { "SHF_TLS", SHF_TLS }, |
| 13870 | { "SHF_MASKOS", SHF_MASKOS }, |
| 13871 | { "SHF_EXCLUDE", SHF_EXCLUDE }, |
| 13872 | }; |
| 13873 | |
| 13874 | /* Returns TRUE if the section is to be included, otherwise FALSE. */ |
| 13875 | bfd_boolean |
| 13876 | bfd_elf_lookup_section_flags (struct bfd_link_info *info, |
| 13877 | struct flag_info *flaginfo, |
| 13878 | asection *section) |
| 13879 | { |
| 13880 | const bfd_vma sh_flags = elf_section_flags (section); |
| 13881 | |
| 13882 | if (!flaginfo->flags_initialized) |
| 13883 | { |
| 13884 | bfd *obfd = info->output_bfd; |
| 13885 | const struct elf_backend_data *bed = get_elf_backend_data (obfd); |
| 13886 | struct flag_info_list *tf = flaginfo->flag_list; |
| 13887 | int with_hex = 0; |
| 13888 | int without_hex = 0; |
| 13889 | |
| 13890 | for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next) |
| 13891 | { |
| 13892 | unsigned i; |
| 13893 | flagword (*lookup) (char *); |
| 13894 | |
| 13895 | lookup = bed->elf_backend_lookup_section_flags_hook; |
| 13896 | if (lookup != NULL) |
| 13897 | { |
| 13898 | flagword hexval = (*lookup) ((char *) tf->name); |
| 13899 | |
| 13900 | if (hexval != 0) |
| 13901 | { |
| 13902 | if (tf->with == with_flags) |
| 13903 | with_hex |= hexval; |
| 13904 | else if (tf->with == without_flags) |
| 13905 | without_hex |= hexval; |
| 13906 | tf->valid = TRUE; |
| 13907 | continue; |
| 13908 | } |
| 13909 | } |
| 13910 | for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i) |
| 13911 | { |
| 13912 | if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0) |
| 13913 | { |
| 13914 | if (tf->with == with_flags) |
| 13915 | with_hex |= elf_flags_to_names[i].flag_value; |
| 13916 | else if (tf->with == without_flags) |
| 13917 | without_hex |= elf_flags_to_names[i].flag_value; |
| 13918 | tf->valid = TRUE; |
| 13919 | break; |
| 13920 | } |
| 13921 | } |
| 13922 | if (!tf->valid) |
| 13923 | { |
| 13924 | info->callbacks->einfo |
| 13925 | (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf->name); |
| 13926 | return FALSE; |
| 13927 | } |
| 13928 | } |
| 13929 | flaginfo->flags_initialized = TRUE; |
| 13930 | flaginfo->only_with_flags |= with_hex; |
| 13931 | flaginfo->not_with_flags |= without_hex; |
| 13932 | } |
| 13933 | |
| 13934 | if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags) |
| 13935 | return FALSE; |
| 13936 | |
| 13937 | if ((flaginfo->not_with_flags & sh_flags) != 0) |
| 13938 | return FALSE; |
| 13939 | |
| 13940 | return TRUE; |
| 13941 | } |
| 13942 | |
| 13943 | struct alloc_got_off_arg { |
| 13944 | bfd_vma gotoff; |
| 13945 | struct bfd_link_info *info; |
| 13946 | }; |
| 13947 | |
| 13948 | /* We need a special top-level link routine to convert got reference counts |
| 13949 | to real got offsets. */ |
| 13950 | |
| 13951 | static bfd_boolean |
| 13952 | elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg) |
| 13953 | { |
| 13954 | struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg; |
| 13955 | bfd *obfd = gofarg->info->output_bfd; |
| 13956 | const struct elf_backend_data *bed = get_elf_backend_data (obfd); |
| 13957 | |
| 13958 | if (h->got.refcount > 0) |
| 13959 | { |
| 13960 | h->got.offset = gofarg->gotoff; |
| 13961 | gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0); |
| 13962 | } |
| 13963 | else |
| 13964 | h->got.offset = (bfd_vma) -1; |
| 13965 | |
| 13966 | return TRUE; |
| 13967 | } |
| 13968 | |
| 13969 | /* And an accompanying bit to work out final got entry offsets once |
| 13970 | we're done. Should be called from final_link. */ |
| 13971 | |
| 13972 | bfd_boolean |
| 13973 | bfd_elf_gc_common_finalize_got_offsets (bfd *abfd, |
| 13974 | struct bfd_link_info *info) |
| 13975 | { |
| 13976 | bfd *i; |
| 13977 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 13978 | bfd_vma gotoff; |
| 13979 | struct alloc_got_off_arg gofarg; |
| 13980 | |
| 13981 | BFD_ASSERT (abfd == info->output_bfd); |
| 13982 | |
| 13983 | if (! is_elf_hash_table (info->hash)) |
| 13984 | return FALSE; |
| 13985 | |
| 13986 | /* The GOT offset is relative to the .got section, but the GOT header is |
| 13987 | put into the .got.plt section, if the backend uses it. */ |
| 13988 | if (bed->want_got_plt) |
| 13989 | gotoff = 0; |
| 13990 | else |
| 13991 | gotoff = bed->got_header_size; |
| 13992 | |
| 13993 | /* Do the local .got entries first. */ |
| 13994 | for (i = info->input_bfds; i; i = i->link.next) |
| 13995 | { |
| 13996 | bfd_signed_vma *local_got; |
| 13997 | size_t j, locsymcount; |
| 13998 | Elf_Internal_Shdr *symtab_hdr; |
| 13999 | |
| 14000 | if (bfd_get_flavour (i) != bfd_target_elf_flavour) |
| 14001 | continue; |
| 14002 | |
| 14003 | local_got = elf_local_got_refcounts (i); |
| 14004 | if (!local_got) |
| 14005 | continue; |
| 14006 | |
| 14007 | symtab_hdr = &elf_tdata (i)->symtab_hdr; |
| 14008 | if (elf_bad_symtab (i)) |
| 14009 | locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym; |
| 14010 | else |
| 14011 | locsymcount = symtab_hdr->sh_info; |
| 14012 | |
| 14013 | for (j = 0; j < locsymcount; ++j) |
| 14014 | { |
| 14015 | if (local_got[j] > 0) |
| 14016 | { |
| 14017 | local_got[j] = gotoff; |
| 14018 | gotoff += bed->got_elt_size (abfd, info, NULL, i, j); |
| 14019 | } |
| 14020 | else |
| 14021 | local_got[j] = (bfd_vma) -1; |
| 14022 | } |
| 14023 | } |
| 14024 | |
| 14025 | /* Then the global .got entries. .plt refcounts are handled by |
| 14026 | adjust_dynamic_symbol */ |
| 14027 | gofarg.gotoff = gotoff; |
| 14028 | gofarg.info = info; |
| 14029 | elf_link_hash_traverse (elf_hash_table (info), |
| 14030 | elf_gc_allocate_got_offsets, |
| 14031 | &gofarg); |
| 14032 | return TRUE; |
| 14033 | } |
| 14034 | |
| 14035 | /* Many folk need no more in the way of final link than this, once |
| 14036 | got entry reference counting is enabled. */ |
| 14037 | |
| 14038 | bfd_boolean |
| 14039 | bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info) |
| 14040 | { |
| 14041 | if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info)) |
| 14042 | return FALSE; |
| 14043 | |
| 14044 | /* Invoke the regular ELF backend linker to do all the work. */ |
| 14045 | return bfd_elf_final_link (abfd, info); |
| 14046 | } |
| 14047 | |
| 14048 | bfd_boolean |
| 14049 | bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie) |
| 14050 | { |
| 14051 | struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie; |
| 14052 | |
| 14053 | if (rcookie->bad_symtab) |
| 14054 | rcookie->rel = rcookie->rels; |
| 14055 | |
| 14056 | for (; rcookie->rel < rcookie->relend; rcookie->rel++) |
| 14057 | { |
| 14058 | unsigned long r_symndx; |
| 14059 | |
| 14060 | if (! rcookie->bad_symtab) |
| 14061 | if (rcookie->rel->r_offset > offset) |
| 14062 | return FALSE; |
| 14063 | if (rcookie->rel->r_offset != offset) |
| 14064 | continue; |
| 14065 | |
| 14066 | r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift; |
| 14067 | if (r_symndx == STN_UNDEF) |
| 14068 | return TRUE; |
| 14069 | |
| 14070 | if (r_symndx >= rcookie->locsymcount |
| 14071 | || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL) |
| 14072 | { |
| 14073 | struct elf_link_hash_entry *h; |
| 14074 | |
| 14075 | h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff]; |
| 14076 | |
| 14077 | while (h->root.type == bfd_link_hash_indirect |
| 14078 | || h->root.type == bfd_link_hash_warning) |
| 14079 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 14080 | |
| 14081 | if ((h->root.type == bfd_link_hash_defined |
| 14082 | || h->root.type == bfd_link_hash_defweak) |
| 14083 | && (h->root.u.def.section->owner != rcookie->abfd |
| 14084 | || h->root.u.def.section->kept_section != NULL |
| 14085 | || discarded_section (h->root.u.def.section))) |
| 14086 | return TRUE; |
| 14087 | } |
| 14088 | else |
| 14089 | { |
| 14090 | /* It's not a relocation against a global symbol, |
| 14091 | but it could be a relocation against a local |
| 14092 | symbol for a discarded section. */ |
| 14093 | asection *isec; |
| 14094 | Elf_Internal_Sym *isym; |
| 14095 | |
| 14096 | /* Need to: get the symbol; get the section. */ |
| 14097 | isym = &rcookie->locsyms[r_symndx]; |
| 14098 | isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx); |
| 14099 | if (isec != NULL |
| 14100 | && (isec->kept_section != NULL |
| 14101 | || discarded_section (isec))) |
| 14102 | return TRUE; |
| 14103 | } |
| 14104 | return FALSE; |
| 14105 | } |
| 14106 | return FALSE; |
| 14107 | } |
| 14108 | |
| 14109 | /* Discard unneeded references to discarded sections. |
| 14110 | Returns -1 on error, 1 if any section's size was changed, 0 if |
| 14111 | nothing changed. This function assumes that the relocations are in |
| 14112 | sorted order, which is true for all known assemblers. */ |
| 14113 | |
| 14114 | int |
| 14115 | bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info) |
| 14116 | { |
| 14117 | struct elf_reloc_cookie cookie; |
| 14118 | asection *o; |
| 14119 | bfd *abfd; |
| 14120 | int changed = 0; |
| 14121 | |
| 14122 | if (info->traditional_format |
| 14123 | || !is_elf_hash_table (info->hash)) |
| 14124 | return 0; |
| 14125 | |
| 14126 | o = bfd_get_section_by_name (output_bfd, ".stab"); |
| 14127 | if (o != NULL) |
| 14128 | { |
| 14129 | asection *i; |
| 14130 | |
| 14131 | for (i = o->map_head.s; i != NULL; i = i->map_head.s) |
| 14132 | { |
| 14133 | if (i->size == 0 |
| 14134 | || i->reloc_count == 0 |
| 14135 | || i->sec_info_type != SEC_INFO_TYPE_STABS) |
| 14136 | continue; |
| 14137 | |
| 14138 | abfd = i->owner; |
| 14139 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) |
| 14140 | continue; |
| 14141 | |
| 14142 | if (!init_reloc_cookie_for_section (&cookie, info, i)) |
| 14143 | return -1; |
| 14144 | |
| 14145 | if (_bfd_discard_section_stabs (abfd, i, |
| 14146 | elf_section_data (i)->sec_info, |
| 14147 | bfd_elf_reloc_symbol_deleted_p, |
| 14148 | &cookie)) |
| 14149 | changed = 1; |
| 14150 | |
| 14151 | fini_reloc_cookie_for_section (&cookie, i); |
| 14152 | } |
| 14153 | } |
| 14154 | |
| 14155 | o = NULL; |
| 14156 | if (info->eh_frame_hdr_type != COMPACT_EH_HDR) |
| 14157 | o = bfd_get_section_by_name (output_bfd, ".eh_frame"); |
| 14158 | if (o != NULL) |
| 14159 | { |
| 14160 | asection *i; |
| 14161 | int eh_changed = 0; |
| 14162 | unsigned int eh_alignment; |
| 14163 | |
| 14164 | for (i = o->map_head.s; i != NULL; i = i->map_head.s) |
| 14165 | { |
| 14166 | if (i->size == 0) |
| 14167 | continue; |
| 14168 | |
| 14169 | abfd = i->owner; |
| 14170 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) |
| 14171 | continue; |
| 14172 | |
| 14173 | if (!init_reloc_cookie_for_section (&cookie, info, i)) |
| 14174 | return -1; |
| 14175 | |
| 14176 | _bfd_elf_parse_eh_frame (abfd, info, i, &cookie); |
| 14177 | if (_bfd_elf_discard_section_eh_frame (abfd, info, i, |
| 14178 | bfd_elf_reloc_symbol_deleted_p, |
| 14179 | &cookie)) |
| 14180 | { |
| 14181 | eh_changed = 1; |
| 14182 | if (i->size != i->rawsize) |
| 14183 | changed = 1; |
| 14184 | } |
| 14185 | |
| 14186 | fini_reloc_cookie_for_section (&cookie, i); |
| 14187 | } |
| 14188 | |
| 14189 | eh_alignment = 1 << o->alignment_power; |
| 14190 | /* Skip over zero terminator, and prevent empty sections from |
| 14191 | adding alignment padding at the end. */ |
| 14192 | for (i = o->map_tail.s; i != NULL; i = i->map_tail.s) |
| 14193 | if (i->size == 0) |
| 14194 | i->flags |= SEC_EXCLUDE; |
| 14195 | else if (i->size > 4) |
| 14196 | break; |
| 14197 | /* The last non-empty eh_frame section doesn't need padding. */ |
| 14198 | if (i != NULL) |
| 14199 | i = i->map_tail.s; |
| 14200 | /* Any prior sections must pad the last FDE out to the output |
| 14201 | section alignment. Otherwise we might have zero padding |
| 14202 | between sections, which would be seen as a terminator. */ |
| 14203 | for (; i != NULL; i = i->map_tail.s) |
| 14204 | if (i->size == 4) |
| 14205 | /* All but the last zero terminator should have been removed. */ |
| 14206 | BFD_FAIL (); |
| 14207 | else |
| 14208 | { |
| 14209 | bfd_size_type size |
| 14210 | = (i->size + eh_alignment - 1) & -eh_alignment; |
| 14211 | if (i->size != size) |
| 14212 | { |
| 14213 | i->size = size; |
| 14214 | changed = 1; |
| 14215 | eh_changed = 1; |
| 14216 | } |
| 14217 | } |
| 14218 | if (eh_changed) |
| 14219 | elf_link_hash_traverse (elf_hash_table (info), |
| 14220 | _bfd_elf_adjust_eh_frame_global_symbol, NULL); |
| 14221 | } |
| 14222 | |
| 14223 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next) |
| 14224 | { |
| 14225 | const struct elf_backend_data *bed; |
| 14226 | asection *s; |
| 14227 | |
| 14228 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) |
| 14229 | continue; |
| 14230 | s = abfd->sections; |
| 14231 | if (s == NULL || s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS) |
| 14232 | continue; |
| 14233 | |
| 14234 | bed = get_elf_backend_data (abfd); |
| 14235 | |
| 14236 | if (bed->elf_backend_discard_info != NULL) |
| 14237 | { |
| 14238 | if (!init_reloc_cookie (&cookie, info, abfd)) |
| 14239 | return -1; |
| 14240 | |
| 14241 | if ((*bed->elf_backend_discard_info) (abfd, &cookie, info)) |
| 14242 | changed = 1; |
| 14243 | |
| 14244 | fini_reloc_cookie (&cookie, abfd); |
| 14245 | } |
| 14246 | } |
| 14247 | |
| 14248 | if (info->eh_frame_hdr_type == COMPACT_EH_HDR) |
| 14249 | _bfd_elf_end_eh_frame_parsing (info); |
| 14250 | |
| 14251 | if (info->eh_frame_hdr_type |
| 14252 | && !bfd_link_relocatable (info) |
| 14253 | && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info)) |
| 14254 | changed = 1; |
| 14255 | |
| 14256 | return changed; |
| 14257 | } |
| 14258 | |
| 14259 | bfd_boolean |
| 14260 | _bfd_elf_section_already_linked (bfd *abfd, |
| 14261 | asection *sec, |
| 14262 | struct bfd_link_info *info) |
| 14263 | { |
| 14264 | flagword flags; |
| 14265 | const char *name, *key; |
| 14266 | struct bfd_section_already_linked *l; |
| 14267 | struct bfd_section_already_linked_hash_entry *already_linked_list; |
| 14268 | |
| 14269 | if (sec->output_section == bfd_abs_section_ptr) |
| 14270 | return FALSE; |
| 14271 | |
| 14272 | flags = sec->flags; |
| 14273 | |
| 14274 | /* Return if it isn't a linkonce section. A comdat group section |
| 14275 | also has SEC_LINK_ONCE set. */ |
| 14276 | if ((flags & SEC_LINK_ONCE) == 0) |
| 14277 | return FALSE; |
| 14278 | |
| 14279 | /* Don't put group member sections on our list of already linked |
| 14280 | sections. They are handled as a group via their group section. */ |
| 14281 | if (elf_sec_group (sec) != NULL) |
| 14282 | return FALSE; |
| 14283 | |
| 14284 | /* For a SHT_GROUP section, use the group signature as the key. */ |
| 14285 | name = sec->name; |
| 14286 | if ((flags & SEC_GROUP) != 0 |
| 14287 | && elf_next_in_group (sec) != NULL |
| 14288 | && elf_group_name (elf_next_in_group (sec)) != NULL) |
| 14289 | key = elf_group_name (elf_next_in_group (sec)); |
| 14290 | else |
| 14291 | { |
| 14292 | /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */ |
| 14293 | if (CONST_STRNEQ (name, ".gnu.linkonce.") |
| 14294 | && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL) |
| 14295 | key++; |
| 14296 | else |
| 14297 | /* Must be a user linkonce section that doesn't follow gcc's |
| 14298 | naming convention. In this case we won't be matching |
| 14299 | single member groups. */ |
| 14300 | key = name; |
| 14301 | } |
| 14302 | |
| 14303 | already_linked_list = bfd_section_already_linked_table_lookup (key); |
| 14304 | |
| 14305 | for (l = already_linked_list->entry; l != NULL; l = l->next) |
| 14306 | { |
| 14307 | /* We may have 2 different types of sections on the list: group |
| 14308 | sections with a signature of <key> (<key> is some string), |
| 14309 | and linkonce sections named .gnu.linkonce.<type>.<key>. |
| 14310 | Match like sections. LTO plugin sections are an exception. |
| 14311 | They are always named .gnu.linkonce.t.<key> and match either |
| 14312 | type of section. */ |
| 14313 | if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP) |
| 14314 | && ((flags & SEC_GROUP) != 0 |
| 14315 | || strcmp (name, l->sec->name) == 0)) |
| 14316 | || (l->sec->owner->flags & BFD_PLUGIN) != 0) |
| 14317 | { |
| 14318 | /* The section has already been linked. See if we should |
| 14319 | issue a warning. */ |
| 14320 | if (!_bfd_handle_already_linked (sec, l, info)) |
| 14321 | return FALSE; |
| 14322 | |
| 14323 | if (flags & SEC_GROUP) |
| 14324 | { |
| 14325 | asection *first = elf_next_in_group (sec); |
| 14326 | asection *s = first; |
| 14327 | |
| 14328 | while (s != NULL) |
| 14329 | { |
| 14330 | s->output_section = bfd_abs_section_ptr; |
| 14331 | /* Record which group discards it. */ |
| 14332 | s->kept_section = l->sec; |
| 14333 | s = elf_next_in_group (s); |
| 14334 | /* These lists are circular. */ |
| 14335 | if (s == first) |
| 14336 | break; |
| 14337 | } |
| 14338 | } |
| 14339 | |
| 14340 | return TRUE; |
| 14341 | } |
| 14342 | } |
| 14343 | |
| 14344 | /* A single member comdat group section may be discarded by a |
| 14345 | linkonce section and vice versa. */ |
| 14346 | if ((flags & SEC_GROUP) != 0) |
| 14347 | { |
| 14348 | asection *first = elf_next_in_group (sec); |
| 14349 | |
| 14350 | if (first != NULL && elf_next_in_group (first) == first) |
| 14351 | /* Check this single member group against linkonce sections. */ |
| 14352 | for (l = already_linked_list->entry; l != NULL; l = l->next) |
| 14353 | if ((l->sec->flags & SEC_GROUP) == 0 |
| 14354 | && bfd_elf_match_symbols_in_sections (l->sec, first, info)) |
| 14355 | { |
| 14356 | first->output_section = bfd_abs_section_ptr; |
| 14357 | first->kept_section = l->sec; |
| 14358 | sec->output_section = bfd_abs_section_ptr; |
| 14359 | break; |
| 14360 | } |
| 14361 | } |
| 14362 | else |
| 14363 | /* Check this linkonce section against single member groups. */ |
| 14364 | for (l = already_linked_list->entry; l != NULL; l = l->next) |
| 14365 | if (l->sec->flags & SEC_GROUP) |
| 14366 | { |
| 14367 | asection *first = elf_next_in_group (l->sec); |
| 14368 | |
| 14369 | if (first != NULL |
| 14370 | && elf_next_in_group (first) == first |
| 14371 | && bfd_elf_match_symbols_in_sections (first, sec, info)) |
| 14372 | { |
| 14373 | sec->output_section = bfd_abs_section_ptr; |
| 14374 | sec->kept_section = first; |
| 14375 | break; |
| 14376 | } |
| 14377 | } |
| 14378 | |
| 14379 | /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F' |
| 14380 | referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4 |
| 14381 | specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce' |
| 14382 | prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its |
| 14383 | matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded |
| 14384 | but its `.gnu.linkonce.t.F' is discarded means we chose one-only |
| 14385 | `.gnu.linkonce.t.F' section from a different bfd not requiring any |
| 14386 | `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded. |
| 14387 | The reverse order cannot happen as there is never a bfd with only the |
| 14388 | `.gnu.linkonce.r.F' section. The order of sections in a bfd does not |
| 14389 | matter as here were are looking only for cross-bfd sections. */ |
| 14390 | |
| 14391 | if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r.")) |
| 14392 | for (l = already_linked_list->entry; l != NULL; l = l->next) |
| 14393 | if ((l->sec->flags & SEC_GROUP) == 0 |
| 14394 | && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t.")) |
| 14395 | { |
| 14396 | if (abfd != l->sec->owner) |
| 14397 | sec->output_section = bfd_abs_section_ptr; |
| 14398 | break; |
| 14399 | } |
| 14400 | |
| 14401 | /* This is the first section with this name. Record it. */ |
| 14402 | if (!bfd_section_already_linked_table_insert (already_linked_list, sec)) |
| 14403 | info->callbacks->einfo (_("%F%P: already_linked_table: %E\n")); |
| 14404 | return sec->output_section == bfd_abs_section_ptr; |
| 14405 | } |
| 14406 | |
| 14407 | bfd_boolean |
| 14408 | _bfd_elf_common_definition (Elf_Internal_Sym *sym) |
| 14409 | { |
| 14410 | return sym->st_shndx == SHN_COMMON; |
| 14411 | } |
| 14412 | |
| 14413 | unsigned int |
| 14414 | _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED) |
| 14415 | { |
| 14416 | return SHN_COMMON; |
| 14417 | } |
| 14418 | |
| 14419 | asection * |
| 14420 | _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED) |
| 14421 | { |
| 14422 | return bfd_com_section_ptr; |
| 14423 | } |
| 14424 | |
| 14425 | bfd_vma |
| 14426 | _bfd_elf_default_got_elt_size (bfd *abfd, |
| 14427 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 14428 | struct elf_link_hash_entry *h ATTRIBUTE_UNUSED, |
| 14429 | bfd *ibfd ATTRIBUTE_UNUSED, |
| 14430 | unsigned long symndx ATTRIBUTE_UNUSED) |
| 14431 | { |
| 14432 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 14433 | return bed->s->arch_size / 8; |
| 14434 | } |
| 14435 | |
| 14436 | /* Routines to support the creation of dynamic relocs. */ |
| 14437 | |
| 14438 | /* Returns the name of the dynamic reloc section associated with SEC. */ |
| 14439 | |
| 14440 | static const char * |
| 14441 | get_dynamic_reloc_section_name (bfd * abfd, |
| 14442 | asection * sec, |
| 14443 | bfd_boolean is_rela) |
| 14444 | { |
| 14445 | char *name; |
| 14446 | const char *old_name = bfd_get_section_name (NULL, sec); |
| 14447 | const char *prefix = is_rela ? ".rela" : ".rel"; |
| 14448 | |
| 14449 | if (old_name == NULL) |
| 14450 | return NULL; |
| 14451 | |
| 14452 | name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1); |
| 14453 | sprintf (name, "%s%s", prefix, old_name); |
| 14454 | |
| 14455 | return name; |
| 14456 | } |
| 14457 | |
| 14458 | /* Returns the dynamic reloc section associated with SEC. |
| 14459 | If necessary compute the name of the dynamic reloc section based |
| 14460 | on SEC's name (looked up in ABFD's string table) and the setting |
| 14461 | of IS_RELA. */ |
| 14462 | |
| 14463 | asection * |
| 14464 | _bfd_elf_get_dynamic_reloc_section (bfd * abfd, |
| 14465 | asection * sec, |
| 14466 | bfd_boolean is_rela) |
| 14467 | { |
| 14468 | asection * reloc_sec = elf_section_data (sec)->sreloc; |
| 14469 | |
| 14470 | if (reloc_sec == NULL) |
| 14471 | { |
| 14472 | const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela); |
| 14473 | |
| 14474 | if (name != NULL) |
| 14475 | { |
| 14476 | reloc_sec = bfd_get_linker_section (abfd, name); |
| 14477 | |
| 14478 | if (reloc_sec != NULL) |
| 14479 | elf_section_data (sec)->sreloc = reloc_sec; |
| 14480 | } |
| 14481 | } |
| 14482 | |
| 14483 | return reloc_sec; |
| 14484 | } |
| 14485 | |
| 14486 | /* Returns the dynamic reloc section associated with SEC. If the |
| 14487 | section does not exist it is created and attached to the DYNOBJ |
| 14488 | bfd and stored in the SRELOC field of SEC's elf_section_data |
| 14489 | structure. |
| 14490 | |
| 14491 | ALIGNMENT is the alignment for the newly created section and |
| 14492 | IS_RELA defines whether the name should be .rela.<SEC's name> |
| 14493 | or .rel.<SEC's name>. The section name is looked up in the |
| 14494 | string table associated with ABFD. */ |
| 14495 | |
| 14496 | asection * |
| 14497 | _bfd_elf_make_dynamic_reloc_section (asection *sec, |
| 14498 | bfd *dynobj, |
| 14499 | unsigned int alignment, |
| 14500 | bfd *abfd, |
| 14501 | bfd_boolean is_rela) |
| 14502 | { |
| 14503 | asection * reloc_sec = elf_section_data (sec)->sreloc; |
| 14504 | |
| 14505 | if (reloc_sec == NULL) |
| 14506 | { |
| 14507 | const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela); |
| 14508 | |
| 14509 | if (name == NULL) |
| 14510 | return NULL; |
| 14511 | |
| 14512 | reloc_sec = bfd_get_linker_section (dynobj, name); |
| 14513 | |
| 14514 | if (reloc_sec == NULL) |
| 14515 | { |
| 14516 | flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 14517 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 14518 | if ((sec->flags & SEC_ALLOC) != 0) |
| 14519 | flags |= SEC_ALLOC | SEC_LOAD; |
| 14520 | |
| 14521 | reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags); |
| 14522 | if (reloc_sec != NULL) |
| 14523 | { |
| 14524 | /* _bfd_elf_get_sec_type_attr chooses a section type by |
| 14525 | name. Override as it may be wrong, eg. for a user |
| 14526 | section named "auto" we'll get ".relauto" which is |
| 14527 | seen to be a .rela section. */ |
| 14528 | elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL; |
| 14529 | if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment)) |
| 14530 | reloc_sec = NULL; |
| 14531 | } |
| 14532 | } |
| 14533 | |
| 14534 | elf_section_data (sec)->sreloc = reloc_sec; |
| 14535 | } |
| 14536 | |
| 14537 | return reloc_sec; |
| 14538 | } |
| 14539 | |
| 14540 | /* Copy the ELF symbol type and other attributes for a linker script |
| 14541 | assignment from HSRC to HDEST. Generally this should be treated as |
| 14542 | if we found a strong non-dynamic definition for HDEST (except that |
| 14543 | ld ignores multiple definition errors). */ |
| 14544 | void |
| 14545 | _bfd_elf_copy_link_hash_symbol_type (bfd *abfd, |
| 14546 | struct bfd_link_hash_entry *hdest, |
| 14547 | struct bfd_link_hash_entry *hsrc) |
| 14548 | { |
| 14549 | struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest; |
| 14550 | struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc; |
| 14551 | Elf_Internal_Sym isym; |
| 14552 | |
| 14553 | ehdest->type = ehsrc->type; |
| 14554 | ehdest->target_internal = ehsrc->target_internal; |
| 14555 | |
| 14556 | isym.st_other = ehsrc->other; |
| 14557 | elf_merge_st_other (abfd, ehdest, &isym, NULL, TRUE, FALSE); |
| 14558 | } |
| 14559 | |
| 14560 | /* Append a RELA relocation REL to section S in BFD. */ |
| 14561 | |
| 14562 | void |
| 14563 | elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel) |
| 14564 | { |
| 14565 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 14566 | bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela); |
| 14567 | BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size); |
| 14568 | bed->s->swap_reloca_out (abfd, rel, loc); |
| 14569 | } |
| 14570 | |
| 14571 | /* Append a REL relocation REL to section S in BFD. */ |
| 14572 | |
| 14573 | void |
| 14574 | elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel) |
| 14575 | { |
| 14576 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 14577 | bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel); |
| 14578 | BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size); |
| 14579 | bed->s->swap_reloc_out (abfd, rel, loc); |
| 14580 | } |
| 14581 | |
| 14582 | /* Define __start, __stop, .startof. or .sizeof. symbol. */ |
| 14583 | |
| 14584 | struct bfd_link_hash_entry * |
| 14585 | bfd_elf_define_start_stop (struct bfd_link_info *info, |
| 14586 | const char *symbol, asection *sec) |
| 14587 | { |
| 14588 | struct elf_link_hash_entry *h; |
| 14589 | |
| 14590 | h = elf_link_hash_lookup (elf_hash_table (info), symbol, |
| 14591 | FALSE, FALSE, TRUE); |
| 14592 | if (h != NULL |
| 14593 | && (h->root.type == bfd_link_hash_undefined |
| 14594 | || h->root.type == bfd_link_hash_undefweak |
| 14595 | || ((h->ref_regular || h->def_dynamic) && !h->def_regular))) |
| 14596 | { |
| 14597 | bfd_boolean was_dynamic = h->ref_dynamic || h->def_dynamic; |
| 14598 | h->root.type = bfd_link_hash_defined; |
| 14599 | h->root.u.def.section = sec; |
| 14600 | h->root.u.def.value = 0; |
| 14601 | h->def_regular = 1; |
| 14602 | h->def_dynamic = 0; |
| 14603 | h->start_stop = 1; |
| 14604 | h->u2.start_stop_section = sec; |
| 14605 | if (symbol[0] == '.') |
| 14606 | { |
| 14607 | /* .startof. and .sizeof. symbols are local. */ |
| 14608 | const struct elf_backend_data *bed; |
| 14609 | bed = get_elf_backend_data (info->output_bfd); |
| 14610 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 14611 | } |
| 14612 | else |
| 14613 | { |
| 14614 | if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
| 14615 | h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_PROTECTED; |
| 14616 | if (was_dynamic) |
| 14617 | bfd_elf_link_record_dynamic_symbol (info, h); |
| 14618 | } |
| 14619 | return &h->root; |
| 14620 | } |
| 14621 | return NULL; |
| 14622 | } |