| 1 | /* ELF linking support for BFD. |
| 2 | Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 20 | |
| 21 | #include "bfd.h" |
| 22 | #include "sysdep.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 | |
| 30 | bfd_boolean |
| 31 | _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info) |
| 32 | { |
| 33 | flagword flags; |
| 34 | asection *s; |
| 35 | struct elf_link_hash_entry *h; |
| 36 | struct bfd_link_hash_entry *bh; |
| 37 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 38 | int ptralign; |
| 39 | |
| 40 | /* This function may be called more than once. */ |
| 41 | s = bfd_get_section_by_name (abfd, ".got"); |
| 42 | if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0) |
| 43 | return TRUE; |
| 44 | |
| 45 | switch (bed->s->arch_size) |
| 46 | { |
| 47 | case 32: |
| 48 | ptralign = 2; |
| 49 | break; |
| 50 | |
| 51 | case 64: |
| 52 | ptralign = 3; |
| 53 | break; |
| 54 | |
| 55 | default: |
| 56 | bfd_set_error (bfd_error_bad_value); |
| 57 | return FALSE; |
| 58 | } |
| 59 | |
| 60 | flags = bed->dynamic_sec_flags; |
| 61 | |
| 62 | s = bfd_make_section_with_flags (abfd, ".got", flags); |
| 63 | if (s == NULL |
| 64 | || !bfd_set_section_alignment (abfd, s, ptralign)) |
| 65 | return FALSE; |
| 66 | |
| 67 | if (bed->want_got_plt) |
| 68 | { |
| 69 | s = bfd_make_section_with_flags (abfd, ".got.plt", flags); |
| 70 | if (s == NULL |
| 71 | || !bfd_set_section_alignment (abfd, s, ptralign)) |
| 72 | return FALSE; |
| 73 | } |
| 74 | |
| 75 | if (bed->want_got_sym) |
| 76 | { |
| 77 | /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got |
| 78 | (or .got.plt) section. We don't do this in the linker script |
| 79 | because we don't want to define the symbol if we are not creating |
| 80 | a global offset table. */ |
| 81 | bh = NULL; |
| 82 | if (!(_bfd_generic_link_add_one_symbol |
| 83 | (info, abfd, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL, s, |
| 84 | 0, NULL, FALSE, bed->collect, &bh))) |
| 85 | return FALSE; |
| 86 | h = (struct elf_link_hash_entry *) bh; |
| 87 | h->def_regular = 1; |
| 88 | h->type = STT_OBJECT; |
| 89 | h->other = STV_HIDDEN; |
| 90 | |
| 91 | if (! info->executable |
| 92 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 93 | return FALSE; |
| 94 | |
| 95 | elf_hash_table (info)->hgot = h; |
| 96 | } |
| 97 | |
| 98 | /* The first bit of the global offset table is the header. */ |
| 99 | s->size += bed->got_header_size; |
| 100 | |
| 101 | return TRUE; |
| 102 | } |
| 103 | \f |
| 104 | /* Create a strtab to hold the dynamic symbol names. */ |
| 105 | static bfd_boolean |
| 106 | _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info) |
| 107 | { |
| 108 | struct elf_link_hash_table *hash_table; |
| 109 | |
| 110 | hash_table = elf_hash_table (info); |
| 111 | if (hash_table->dynobj == NULL) |
| 112 | hash_table->dynobj = abfd; |
| 113 | |
| 114 | if (hash_table->dynstr == NULL) |
| 115 | { |
| 116 | hash_table->dynstr = _bfd_elf_strtab_init (); |
| 117 | if (hash_table->dynstr == NULL) |
| 118 | return FALSE; |
| 119 | } |
| 120 | return TRUE; |
| 121 | } |
| 122 | |
| 123 | /* Create some sections which will be filled in with dynamic linking |
| 124 | information. ABFD is an input file which requires dynamic sections |
| 125 | to be created. The dynamic sections take up virtual memory space |
| 126 | when the final executable is run, so we need to create them before |
| 127 | addresses are assigned to the output sections. We work out the |
| 128 | actual contents and size of these sections later. */ |
| 129 | |
| 130 | bfd_boolean |
| 131 | _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) |
| 132 | { |
| 133 | flagword flags; |
| 134 | register asection *s; |
| 135 | struct elf_link_hash_entry *h; |
| 136 | struct bfd_link_hash_entry *bh; |
| 137 | const struct elf_backend_data *bed; |
| 138 | |
| 139 | if (! is_elf_hash_table (info->hash)) |
| 140 | return FALSE; |
| 141 | |
| 142 | if (elf_hash_table (info)->dynamic_sections_created) |
| 143 | return TRUE; |
| 144 | |
| 145 | if (!_bfd_elf_link_create_dynstrtab (abfd, info)) |
| 146 | return FALSE; |
| 147 | |
| 148 | abfd = elf_hash_table (info)->dynobj; |
| 149 | bed = get_elf_backend_data (abfd); |
| 150 | |
| 151 | flags = bed->dynamic_sec_flags; |
| 152 | |
| 153 | /* A dynamically linked executable has a .interp section, but a |
| 154 | shared library does not. */ |
| 155 | if (info->executable) |
| 156 | { |
| 157 | s = bfd_make_section_with_flags (abfd, ".interp", |
| 158 | flags | SEC_READONLY); |
| 159 | if (s == NULL) |
| 160 | return FALSE; |
| 161 | } |
| 162 | |
| 163 | if (! info->traditional_format) |
| 164 | { |
| 165 | s = bfd_make_section_with_flags (abfd, ".eh_frame_hdr", |
| 166 | flags | SEC_READONLY); |
| 167 | if (s == NULL |
| 168 | || ! bfd_set_section_alignment (abfd, s, 2)) |
| 169 | return FALSE; |
| 170 | elf_hash_table (info)->eh_info.hdr_sec = s; |
| 171 | } |
| 172 | |
| 173 | /* Create sections to hold version informations. These are removed |
| 174 | if they are not needed. */ |
| 175 | s = bfd_make_section_with_flags (abfd, ".gnu.version_d", |
| 176 | flags | SEC_READONLY); |
| 177 | if (s == NULL |
| 178 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 179 | return FALSE; |
| 180 | |
| 181 | s = bfd_make_section_with_flags (abfd, ".gnu.version", |
| 182 | flags | SEC_READONLY); |
| 183 | if (s == NULL |
| 184 | || ! bfd_set_section_alignment (abfd, s, 1)) |
| 185 | return FALSE; |
| 186 | |
| 187 | s = bfd_make_section_with_flags (abfd, ".gnu.version_r", |
| 188 | flags | SEC_READONLY); |
| 189 | if (s == NULL |
| 190 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 191 | return FALSE; |
| 192 | |
| 193 | s = bfd_make_section_with_flags (abfd, ".dynsym", |
| 194 | flags | SEC_READONLY); |
| 195 | if (s == NULL |
| 196 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 197 | return FALSE; |
| 198 | |
| 199 | s = bfd_make_section_with_flags (abfd, ".dynstr", |
| 200 | flags | SEC_READONLY); |
| 201 | if (s == NULL) |
| 202 | return FALSE; |
| 203 | |
| 204 | s = bfd_make_section_with_flags (abfd, ".dynamic", flags); |
| 205 | if (s == NULL |
| 206 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 207 | return FALSE; |
| 208 | |
| 209 | /* The special symbol _DYNAMIC is always set to the start of the |
| 210 | .dynamic section. We could set _DYNAMIC in a linker script, but we |
| 211 | only want to define it if we are, in fact, creating a .dynamic |
| 212 | section. We don't want to define it if there is no .dynamic |
| 213 | section, since on some ELF platforms the start up code examines it |
| 214 | to decide how to initialize the process. */ |
| 215 | h = elf_link_hash_lookup (elf_hash_table (info), "_DYNAMIC", |
| 216 | FALSE, FALSE, FALSE); |
| 217 | if (h != NULL) |
| 218 | { |
| 219 | /* Zap symbol defined in an as-needed lib that wasn't linked. |
| 220 | This is a symptom of a larger problem: Absolute symbols |
| 221 | defined in shared libraries can't be overridden, because we |
| 222 | lose the link to the bfd which is via the symbol section. */ |
| 223 | h->root.type = bfd_link_hash_new; |
| 224 | } |
| 225 | bh = &h->root; |
| 226 | if (! (_bfd_generic_link_add_one_symbol |
| 227 | (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, 0, NULL, FALSE, |
| 228 | get_elf_backend_data (abfd)->collect, &bh))) |
| 229 | return FALSE; |
| 230 | h = (struct elf_link_hash_entry *) bh; |
| 231 | h->def_regular = 1; |
| 232 | h->type = STT_OBJECT; |
| 233 | |
| 234 | if (! info->executable |
| 235 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 236 | return FALSE; |
| 237 | |
| 238 | s = bfd_make_section_with_flags (abfd, ".hash", |
| 239 | flags | SEC_READONLY); |
| 240 | if (s == NULL |
| 241 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 242 | return FALSE; |
| 243 | elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry; |
| 244 | |
| 245 | /* Let the backend create the rest of the sections. This lets the |
| 246 | backend set the right flags. The backend will normally create |
| 247 | the .got and .plt sections. */ |
| 248 | if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info)) |
| 249 | return FALSE; |
| 250 | |
| 251 | elf_hash_table (info)->dynamic_sections_created = TRUE; |
| 252 | |
| 253 | return TRUE; |
| 254 | } |
| 255 | |
| 256 | /* Create dynamic sections when linking against a dynamic object. */ |
| 257 | |
| 258 | bfd_boolean |
| 259 | _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) |
| 260 | { |
| 261 | flagword flags, pltflags; |
| 262 | asection *s; |
| 263 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 264 | |
| 265 | /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and |
| 266 | .rel[a].bss sections. */ |
| 267 | flags = bed->dynamic_sec_flags; |
| 268 | |
| 269 | pltflags = flags; |
| 270 | if (bed->plt_not_loaded) |
| 271 | /* We do not clear SEC_ALLOC here because we still want the OS to |
| 272 | allocate space for the section; it's just that there's nothing |
| 273 | to read in from the object file. */ |
| 274 | pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS); |
| 275 | else |
| 276 | pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD; |
| 277 | if (bed->plt_readonly) |
| 278 | pltflags |= SEC_READONLY; |
| 279 | |
| 280 | s = bfd_make_section_with_flags (abfd, ".plt", pltflags); |
| 281 | if (s == NULL |
| 282 | || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) |
| 283 | return FALSE; |
| 284 | |
| 285 | if (bed->want_plt_sym) |
| 286 | { |
| 287 | /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the |
| 288 | .plt section. */ |
| 289 | struct elf_link_hash_entry *h; |
| 290 | struct bfd_link_hash_entry *bh = NULL; |
| 291 | |
| 292 | if (! (_bfd_generic_link_add_one_symbol |
| 293 | (info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s, 0, NULL, |
| 294 | FALSE, get_elf_backend_data (abfd)->collect, &bh))) |
| 295 | return FALSE; |
| 296 | h = (struct elf_link_hash_entry *) bh; |
| 297 | h->def_regular = 1; |
| 298 | h->type = STT_OBJECT; |
| 299 | |
| 300 | if (! info->executable |
| 301 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 302 | return FALSE; |
| 303 | } |
| 304 | |
| 305 | s = bfd_make_section_with_flags (abfd, |
| 306 | (bed->default_use_rela_p |
| 307 | ? ".rela.plt" : ".rel.plt"), |
| 308 | flags | SEC_READONLY); |
| 309 | if (s == NULL |
| 310 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 311 | return FALSE; |
| 312 | |
| 313 | if (! _bfd_elf_create_got_section (abfd, info)) |
| 314 | return FALSE; |
| 315 | |
| 316 | if (bed->want_dynbss) |
| 317 | { |
| 318 | /* The .dynbss section is a place to put symbols which are defined |
| 319 | by dynamic objects, are referenced by regular objects, and are |
| 320 | not functions. We must allocate space for them in the process |
| 321 | image and use a R_*_COPY reloc to tell the dynamic linker to |
| 322 | initialize them at run time. The linker script puts the .dynbss |
| 323 | section into the .bss section of the final image. */ |
| 324 | s = bfd_make_section_with_flags (abfd, ".dynbss", |
| 325 | (SEC_ALLOC |
| 326 | | SEC_LINKER_CREATED)); |
| 327 | if (s == NULL) |
| 328 | return FALSE; |
| 329 | |
| 330 | /* The .rel[a].bss section holds copy relocs. This section is not |
| 331 | normally needed. We need to create it here, though, so that the |
| 332 | linker will map it to an output section. We can't just create it |
| 333 | only if we need it, because we will not know whether we need it |
| 334 | until we have seen all the input files, and the first time the |
| 335 | main linker code calls BFD after examining all the input files |
| 336 | (size_dynamic_sections) the input sections have already been |
| 337 | mapped to the output sections. If the section turns out not to |
| 338 | be needed, we can discard it later. We will never need this |
| 339 | section when generating a shared object, since they do not use |
| 340 | copy relocs. */ |
| 341 | if (! info->shared) |
| 342 | { |
| 343 | s = bfd_make_section_with_flags (abfd, |
| 344 | (bed->default_use_rela_p |
| 345 | ? ".rela.bss" : ".rel.bss"), |
| 346 | flags | SEC_READONLY); |
| 347 | if (s == NULL |
| 348 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 349 | return FALSE; |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | return TRUE; |
| 354 | } |
| 355 | \f |
| 356 | /* Record a new dynamic symbol. We record the dynamic symbols as we |
| 357 | read the input files, since we need to have a list of all of them |
| 358 | before we can determine the final sizes of the output sections. |
| 359 | Note that we may actually call this function even though we are not |
| 360 | going to output any dynamic symbols; in some cases we know that a |
| 361 | symbol should be in the dynamic symbol table, but only if there is |
| 362 | one. */ |
| 363 | |
| 364 | bfd_boolean |
| 365 | bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info, |
| 366 | struct elf_link_hash_entry *h) |
| 367 | { |
| 368 | if (h->dynindx == -1) |
| 369 | { |
| 370 | struct elf_strtab_hash *dynstr; |
| 371 | char *p; |
| 372 | const char *name; |
| 373 | bfd_size_type indx; |
| 374 | |
| 375 | /* XXX: The ABI draft says the linker must turn hidden and |
| 376 | internal symbols into STB_LOCAL symbols when producing the |
| 377 | DSO. However, if ld.so honors st_other in the dynamic table, |
| 378 | this would not be necessary. */ |
| 379 | switch (ELF_ST_VISIBILITY (h->other)) |
| 380 | { |
| 381 | case STV_INTERNAL: |
| 382 | case STV_HIDDEN: |
| 383 | if (h->root.type != bfd_link_hash_undefined |
| 384 | && h->root.type != bfd_link_hash_undefweak) |
| 385 | { |
| 386 | h->forced_local = 1; |
| 387 | if (!elf_hash_table (info)->is_relocatable_executable) |
| 388 | return TRUE; |
| 389 | } |
| 390 | |
| 391 | default: |
| 392 | break; |
| 393 | } |
| 394 | |
| 395 | h->dynindx = elf_hash_table (info)->dynsymcount; |
| 396 | ++elf_hash_table (info)->dynsymcount; |
| 397 | |
| 398 | dynstr = elf_hash_table (info)->dynstr; |
| 399 | if (dynstr == NULL) |
| 400 | { |
| 401 | /* Create a strtab to hold the dynamic symbol names. */ |
| 402 | elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init (); |
| 403 | if (dynstr == NULL) |
| 404 | return FALSE; |
| 405 | } |
| 406 | |
| 407 | /* We don't put any version information in the dynamic string |
| 408 | table. */ |
| 409 | name = h->root.root.string; |
| 410 | p = strchr (name, ELF_VER_CHR); |
| 411 | if (p != NULL) |
| 412 | /* We know that the p points into writable memory. In fact, |
| 413 | there are only a few symbols that have read-only names, being |
| 414 | those like _GLOBAL_OFFSET_TABLE_ that are created specially |
| 415 | by the backends. Most symbols will have names pointing into |
| 416 | an ELF string table read from a file, or to objalloc memory. */ |
| 417 | *p = 0; |
| 418 | |
| 419 | indx = _bfd_elf_strtab_add (dynstr, name, p != NULL); |
| 420 | |
| 421 | if (p != NULL) |
| 422 | *p = ELF_VER_CHR; |
| 423 | |
| 424 | if (indx == (bfd_size_type) -1) |
| 425 | return FALSE; |
| 426 | h->dynstr_index = indx; |
| 427 | } |
| 428 | |
| 429 | return TRUE; |
| 430 | } |
| 431 | \f |
| 432 | /* Record an assignment to a symbol made by a linker script. We need |
| 433 | this in case some dynamic object refers to this symbol. */ |
| 434 | |
| 435 | bfd_boolean |
| 436 | bfd_elf_record_link_assignment (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 437 | struct bfd_link_info *info, |
| 438 | const char *name, |
| 439 | bfd_boolean provide) |
| 440 | { |
| 441 | struct elf_link_hash_entry *h; |
| 442 | struct elf_link_hash_table *htab; |
| 443 | |
| 444 | if (!is_elf_hash_table (info->hash)) |
| 445 | return TRUE; |
| 446 | |
| 447 | htab = elf_hash_table (info); |
| 448 | h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE); |
| 449 | if (h == NULL) |
| 450 | return provide; |
| 451 | |
| 452 | /* Since we're defining the symbol, don't let it seem to have not |
| 453 | been defined. record_dynamic_symbol and size_dynamic_sections |
| 454 | may depend on this. */ |
| 455 | if (h->root.type == bfd_link_hash_undefweak |
| 456 | || h->root.type == bfd_link_hash_undefined) |
| 457 | { |
| 458 | h->root.type = bfd_link_hash_new; |
| 459 | if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root) |
| 460 | bfd_link_repair_undef_list (&htab->root); |
| 461 | } |
| 462 | |
| 463 | if (h->root.type == bfd_link_hash_new) |
| 464 | h->non_elf = 0; |
| 465 | |
| 466 | /* If this symbol is being provided by the linker script, and it is |
| 467 | currently defined by a dynamic object, but not by a regular |
| 468 | object, then mark it as undefined so that the generic linker will |
| 469 | force the correct value. */ |
| 470 | if (provide |
| 471 | && h->def_dynamic |
| 472 | && !h->def_regular) |
| 473 | h->root.type = bfd_link_hash_undefined; |
| 474 | |
| 475 | /* If this symbol is not being provided by the linker script, and it is |
| 476 | currently defined by a dynamic object, but not by a regular object, |
| 477 | then clear out any version information because the symbol will not be |
| 478 | associated with the dynamic object any more. */ |
| 479 | if (!provide |
| 480 | && h->def_dynamic |
| 481 | && !h->def_regular) |
| 482 | h->verinfo.verdef = NULL; |
| 483 | |
| 484 | h->def_regular = 1; |
| 485 | |
| 486 | /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects |
| 487 | and executables. */ |
| 488 | if (!info->relocatable |
| 489 | && h->dynindx != -1 |
| 490 | && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN |
| 491 | || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)) |
| 492 | h->forced_local = 1; |
| 493 | |
| 494 | if ((h->def_dynamic |
| 495 | || h->ref_dynamic |
| 496 | || info->shared |
| 497 | || (info->executable && elf_hash_table (info)->is_relocatable_executable)) |
| 498 | && h->dynindx == -1) |
| 499 | { |
| 500 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 501 | return FALSE; |
| 502 | |
| 503 | /* If this is a weak defined symbol, and we know a corresponding |
| 504 | real symbol from the same dynamic object, make sure the real |
| 505 | symbol is also made into a dynamic symbol. */ |
| 506 | if (h->u.weakdef != NULL |
| 507 | && h->u.weakdef->dynindx == -1) |
| 508 | { |
| 509 | if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef)) |
| 510 | return FALSE; |
| 511 | } |
| 512 | } |
| 513 | |
| 514 | return TRUE; |
| 515 | } |
| 516 | |
| 517 | /* Record a new local dynamic symbol. Returns 0 on failure, 1 on |
| 518 | success, and 2 on a failure caused by attempting to record a symbol |
| 519 | in a discarded section, eg. a discarded link-once section symbol. */ |
| 520 | |
| 521 | int |
| 522 | bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info, |
| 523 | bfd *input_bfd, |
| 524 | long input_indx) |
| 525 | { |
| 526 | bfd_size_type amt; |
| 527 | struct elf_link_local_dynamic_entry *entry; |
| 528 | struct elf_link_hash_table *eht; |
| 529 | struct elf_strtab_hash *dynstr; |
| 530 | unsigned long dynstr_index; |
| 531 | char *name; |
| 532 | Elf_External_Sym_Shndx eshndx; |
| 533 | char esym[sizeof (Elf64_External_Sym)]; |
| 534 | |
| 535 | if (! is_elf_hash_table (info->hash)) |
| 536 | return 0; |
| 537 | |
| 538 | /* See if the entry exists already. */ |
| 539 | for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next) |
| 540 | if (entry->input_bfd == input_bfd && entry->input_indx == input_indx) |
| 541 | return 1; |
| 542 | |
| 543 | amt = sizeof (*entry); |
| 544 | entry = bfd_alloc (input_bfd, amt); |
| 545 | if (entry == NULL) |
| 546 | return 0; |
| 547 | |
| 548 | /* Go find the symbol, so that we can find it's name. */ |
| 549 | if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr, |
| 550 | 1, input_indx, &entry->isym, esym, &eshndx)) |
| 551 | { |
| 552 | bfd_release (input_bfd, entry); |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | if (entry->isym.st_shndx != SHN_UNDEF |
| 557 | && (entry->isym.st_shndx < SHN_LORESERVE |
| 558 | || entry->isym.st_shndx > SHN_HIRESERVE)) |
| 559 | { |
| 560 | asection *s; |
| 561 | |
| 562 | s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx); |
| 563 | if (s == NULL || bfd_is_abs_section (s->output_section)) |
| 564 | { |
| 565 | /* We can still bfd_release here as nothing has done another |
| 566 | bfd_alloc. We can't do this later in this function. */ |
| 567 | bfd_release (input_bfd, entry); |
| 568 | return 2; |
| 569 | } |
| 570 | } |
| 571 | |
| 572 | name = (bfd_elf_string_from_elf_section |
| 573 | (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link, |
| 574 | entry->isym.st_name)); |
| 575 | |
| 576 | dynstr = elf_hash_table (info)->dynstr; |
| 577 | if (dynstr == NULL) |
| 578 | { |
| 579 | /* Create a strtab to hold the dynamic symbol names. */ |
| 580 | elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init (); |
| 581 | if (dynstr == NULL) |
| 582 | return 0; |
| 583 | } |
| 584 | |
| 585 | dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE); |
| 586 | if (dynstr_index == (unsigned long) -1) |
| 587 | return 0; |
| 588 | entry->isym.st_name = dynstr_index; |
| 589 | |
| 590 | eht = elf_hash_table (info); |
| 591 | |
| 592 | entry->next = eht->dynlocal; |
| 593 | eht->dynlocal = entry; |
| 594 | entry->input_bfd = input_bfd; |
| 595 | entry->input_indx = input_indx; |
| 596 | eht->dynsymcount++; |
| 597 | |
| 598 | /* Whatever binding the symbol had before, it's now local. */ |
| 599 | entry->isym.st_info |
| 600 | = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info)); |
| 601 | |
| 602 | /* The dynindx will be set at the end of size_dynamic_sections. */ |
| 603 | |
| 604 | return 1; |
| 605 | } |
| 606 | |
| 607 | /* Return the dynindex of a local dynamic symbol. */ |
| 608 | |
| 609 | long |
| 610 | _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info, |
| 611 | bfd *input_bfd, |
| 612 | long input_indx) |
| 613 | { |
| 614 | struct elf_link_local_dynamic_entry *e; |
| 615 | |
| 616 | for (e = elf_hash_table (info)->dynlocal; e ; e = e->next) |
| 617 | if (e->input_bfd == input_bfd && e->input_indx == input_indx) |
| 618 | return e->dynindx; |
| 619 | return -1; |
| 620 | } |
| 621 | |
| 622 | /* This function is used to renumber the dynamic symbols, if some of |
| 623 | them are removed because they are marked as local. This is called |
| 624 | via elf_link_hash_traverse. */ |
| 625 | |
| 626 | static bfd_boolean |
| 627 | elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h, |
| 628 | void *data) |
| 629 | { |
| 630 | size_t *count = data; |
| 631 | |
| 632 | if (h->root.type == bfd_link_hash_warning) |
| 633 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 634 | |
| 635 | if (h->forced_local) |
| 636 | return TRUE; |
| 637 | |
| 638 | if (h->dynindx != -1) |
| 639 | h->dynindx = ++(*count); |
| 640 | |
| 641 | return TRUE; |
| 642 | } |
| 643 | |
| 644 | |
| 645 | /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with |
| 646 | STB_LOCAL binding. */ |
| 647 | |
| 648 | static bfd_boolean |
| 649 | elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h, |
| 650 | void *data) |
| 651 | { |
| 652 | size_t *count = data; |
| 653 | |
| 654 | if (h->root.type == bfd_link_hash_warning) |
| 655 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 656 | |
| 657 | if (!h->forced_local) |
| 658 | return TRUE; |
| 659 | |
| 660 | if (h->dynindx != -1) |
| 661 | h->dynindx = ++(*count); |
| 662 | |
| 663 | return TRUE; |
| 664 | } |
| 665 | |
| 666 | /* Return true if the dynamic symbol for a given section should be |
| 667 | omitted when creating a shared library. */ |
| 668 | bfd_boolean |
| 669 | _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 670 | struct bfd_link_info *info, |
| 671 | asection *p) |
| 672 | { |
| 673 | switch (elf_section_data (p)->this_hdr.sh_type) |
| 674 | { |
| 675 | case SHT_PROGBITS: |
| 676 | case SHT_NOBITS: |
| 677 | /* If sh_type is yet undecided, assume it could be |
| 678 | SHT_PROGBITS/SHT_NOBITS. */ |
| 679 | case SHT_NULL: |
| 680 | if (strcmp (p->name, ".got") == 0 |
| 681 | || strcmp (p->name, ".got.plt") == 0 |
| 682 | || strcmp (p->name, ".plt") == 0) |
| 683 | { |
| 684 | asection *ip; |
| 685 | bfd *dynobj = elf_hash_table (info)->dynobj; |
| 686 | |
| 687 | if (dynobj != NULL |
| 688 | && (ip = bfd_get_section_by_name (dynobj, p->name)) != NULL |
| 689 | && (ip->flags & SEC_LINKER_CREATED) |
| 690 | && ip->output_section == p) |
| 691 | return TRUE; |
| 692 | } |
| 693 | return FALSE; |
| 694 | |
| 695 | /* There shouldn't be section relative relocations |
| 696 | against any other section. */ |
| 697 | default: |
| 698 | return TRUE; |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | /* Assign dynsym indices. In a shared library we generate a section |
| 703 | symbol for each output section, which come first. Next come symbols |
| 704 | which have been forced to local binding. Then all of the back-end |
| 705 | allocated local dynamic syms, followed by the rest of the global |
| 706 | symbols. */ |
| 707 | |
| 708 | static unsigned long |
| 709 | _bfd_elf_link_renumber_dynsyms (bfd *output_bfd, |
| 710 | struct bfd_link_info *info, |
| 711 | unsigned long *section_sym_count) |
| 712 | { |
| 713 | unsigned long dynsymcount = 0; |
| 714 | |
| 715 | if (info->shared || elf_hash_table (info)->is_relocatable_executable) |
| 716 | { |
| 717 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); |
| 718 | asection *p; |
| 719 | for (p = output_bfd->sections; p ; p = p->next) |
| 720 | if ((p->flags & SEC_EXCLUDE) == 0 |
| 721 | && (p->flags & SEC_ALLOC) != 0 |
| 722 | && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p)) |
| 723 | elf_section_data (p)->dynindx = ++dynsymcount; |
| 724 | } |
| 725 | *section_sym_count = dynsymcount; |
| 726 | |
| 727 | elf_link_hash_traverse (elf_hash_table (info), |
| 728 | elf_link_renumber_local_hash_table_dynsyms, |
| 729 | &dynsymcount); |
| 730 | |
| 731 | if (elf_hash_table (info)->dynlocal) |
| 732 | { |
| 733 | struct elf_link_local_dynamic_entry *p; |
| 734 | for (p = elf_hash_table (info)->dynlocal; p ; p = p->next) |
| 735 | p->dynindx = ++dynsymcount; |
| 736 | } |
| 737 | |
| 738 | elf_link_hash_traverse (elf_hash_table (info), |
| 739 | elf_link_renumber_hash_table_dynsyms, |
| 740 | &dynsymcount); |
| 741 | |
| 742 | /* There is an unused NULL entry at the head of the table which |
| 743 | we must account for in our count. Unless there weren't any |
| 744 | symbols, which means we'll have no table at all. */ |
| 745 | if (dynsymcount != 0) |
| 746 | ++dynsymcount; |
| 747 | |
| 748 | return elf_hash_table (info)->dynsymcount = dynsymcount; |
| 749 | } |
| 750 | |
| 751 | /* This function is called when we want to define a new symbol. It |
| 752 | handles the various cases which arise when we find a definition in |
| 753 | a dynamic object, or when there is already a definition in a |
| 754 | dynamic object. The new symbol is described by NAME, SYM, PSEC, |
| 755 | and PVALUE. We set SYM_HASH to the hash table entry. We set |
| 756 | OVERRIDE if the old symbol is overriding a new definition. We set |
| 757 | TYPE_CHANGE_OK if it is OK for the type to change. We set |
| 758 | SIZE_CHANGE_OK if it is OK for the size to change. By OK to |
| 759 | change, we mean that we shouldn't warn if the type or size does |
| 760 | change. We set POLD_ALIGNMENT if an old common symbol in a dynamic |
| 761 | object is overridden by a regular object. */ |
| 762 | |
| 763 | bfd_boolean |
| 764 | _bfd_elf_merge_symbol (bfd *abfd, |
| 765 | struct bfd_link_info *info, |
| 766 | const char *name, |
| 767 | Elf_Internal_Sym *sym, |
| 768 | asection **psec, |
| 769 | bfd_vma *pvalue, |
| 770 | unsigned int *pold_alignment, |
| 771 | struct elf_link_hash_entry **sym_hash, |
| 772 | bfd_boolean *skip, |
| 773 | bfd_boolean *override, |
| 774 | bfd_boolean *type_change_ok, |
| 775 | bfd_boolean *size_change_ok) |
| 776 | { |
| 777 | asection *sec, *oldsec; |
| 778 | struct elf_link_hash_entry *h; |
| 779 | struct elf_link_hash_entry *flip; |
| 780 | int bind; |
| 781 | bfd *oldbfd; |
| 782 | bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon; |
| 783 | bfd_boolean newweak, oldweak; |
| 784 | |
| 785 | *skip = FALSE; |
| 786 | *override = FALSE; |
| 787 | |
| 788 | sec = *psec; |
| 789 | bind = ELF_ST_BIND (sym->st_info); |
| 790 | |
| 791 | if (! bfd_is_und_section (sec)) |
| 792 | h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE); |
| 793 | else |
| 794 | h = ((struct elf_link_hash_entry *) |
| 795 | bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE)); |
| 796 | if (h == NULL) |
| 797 | return FALSE; |
| 798 | *sym_hash = h; |
| 799 | |
| 800 | /* This code is for coping with dynamic objects, and is only useful |
| 801 | if we are doing an ELF link. */ |
| 802 | if (info->hash->creator != abfd->xvec) |
| 803 | return TRUE; |
| 804 | |
| 805 | /* For merging, we only care about real symbols. */ |
| 806 | |
| 807 | while (h->root.type == bfd_link_hash_indirect |
| 808 | || h->root.type == bfd_link_hash_warning) |
| 809 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 810 | |
| 811 | /* If we just created the symbol, mark it as being an ELF symbol. |
| 812 | Other than that, there is nothing to do--there is no merge issue |
| 813 | with a newly defined symbol--so we just return. */ |
| 814 | |
| 815 | if (h->root.type == bfd_link_hash_new) |
| 816 | { |
| 817 | h->non_elf = 0; |
| 818 | return TRUE; |
| 819 | } |
| 820 | |
| 821 | /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the |
| 822 | existing symbol. */ |
| 823 | |
| 824 | switch (h->root.type) |
| 825 | { |
| 826 | default: |
| 827 | oldbfd = NULL; |
| 828 | oldsec = NULL; |
| 829 | break; |
| 830 | |
| 831 | case bfd_link_hash_undefined: |
| 832 | case bfd_link_hash_undefweak: |
| 833 | oldbfd = h->root.u.undef.abfd; |
| 834 | oldsec = NULL; |
| 835 | break; |
| 836 | |
| 837 | case bfd_link_hash_defined: |
| 838 | case bfd_link_hash_defweak: |
| 839 | oldbfd = h->root.u.def.section->owner; |
| 840 | oldsec = h->root.u.def.section; |
| 841 | break; |
| 842 | |
| 843 | case bfd_link_hash_common: |
| 844 | oldbfd = h->root.u.c.p->section->owner; |
| 845 | oldsec = h->root.u.c.p->section; |
| 846 | break; |
| 847 | } |
| 848 | |
| 849 | /* In cases involving weak versioned symbols, we may wind up trying |
| 850 | to merge a symbol with itself. Catch that here, to avoid the |
| 851 | confusion that results if we try to override a symbol with |
| 852 | itself. The additional tests catch cases like |
| 853 | _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a |
| 854 | dynamic object, which we do want to handle here. */ |
| 855 | if (abfd == oldbfd |
| 856 | && ((abfd->flags & DYNAMIC) == 0 |
| 857 | || !h->def_regular)) |
| 858 | return TRUE; |
| 859 | |
| 860 | /* NEWDYN and OLDDYN indicate whether the new or old symbol, |
| 861 | respectively, is from a dynamic object. */ |
| 862 | |
| 863 | if ((abfd->flags & DYNAMIC) != 0) |
| 864 | newdyn = TRUE; |
| 865 | else |
| 866 | newdyn = FALSE; |
| 867 | |
| 868 | if (oldbfd != NULL) |
| 869 | olddyn = (oldbfd->flags & DYNAMIC) != 0; |
| 870 | else |
| 871 | { |
| 872 | asection *hsec; |
| 873 | |
| 874 | /* This code handles the special SHN_MIPS_{TEXT,DATA} section |
| 875 | indices used by MIPS ELF. */ |
| 876 | switch (h->root.type) |
| 877 | { |
| 878 | default: |
| 879 | hsec = NULL; |
| 880 | break; |
| 881 | |
| 882 | case bfd_link_hash_defined: |
| 883 | case bfd_link_hash_defweak: |
| 884 | hsec = h->root.u.def.section; |
| 885 | break; |
| 886 | |
| 887 | case bfd_link_hash_common: |
| 888 | hsec = h->root.u.c.p->section; |
| 889 | break; |
| 890 | } |
| 891 | |
| 892 | if (hsec == NULL) |
| 893 | olddyn = FALSE; |
| 894 | else |
| 895 | olddyn = (hsec->symbol->flags & BSF_DYNAMIC) != 0; |
| 896 | } |
| 897 | |
| 898 | /* NEWDEF and OLDDEF indicate whether the new or old symbol, |
| 899 | respectively, appear to be a definition rather than reference. */ |
| 900 | |
| 901 | if (bfd_is_und_section (sec) || bfd_is_com_section (sec)) |
| 902 | newdef = FALSE; |
| 903 | else |
| 904 | newdef = TRUE; |
| 905 | |
| 906 | if (h->root.type == bfd_link_hash_undefined |
| 907 | || h->root.type == bfd_link_hash_undefweak |
| 908 | || h->root.type == bfd_link_hash_common) |
| 909 | olddef = FALSE; |
| 910 | else |
| 911 | olddef = TRUE; |
| 912 | |
| 913 | /* Check TLS symbol. */ |
| 914 | if ((ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS) |
| 915 | && ELF_ST_TYPE (sym->st_info) != h->type) |
| 916 | { |
| 917 | bfd *ntbfd, *tbfd; |
| 918 | bfd_boolean ntdef, tdef; |
| 919 | asection *ntsec, *tsec; |
| 920 | |
| 921 | if (h->type == STT_TLS) |
| 922 | { |
| 923 | ntbfd = abfd; |
| 924 | ntsec = sec; |
| 925 | ntdef = newdef; |
| 926 | tbfd = oldbfd; |
| 927 | tsec = oldsec; |
| 928 | tdef = olddef; |
| 929 | } |
| 930 | else |
| 931 | { |
| 932 | ntbfd = oldbfd; |
| 933 | ntsec = oldsec; |
| 934 | ntdef = olddef; |
| 935 | tbfd = abfd; |
| 936 | tsec = sec; |
| 937 | tdef = newdef; |
| 938 | } |
| 939 | |
| 940 | if (tdef && ntdef) |
| 941 | (*_bfd_error_handler) |
| 942 | (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"), |
| 943 | tbfd, tsec, ntbfd, ntsec, h->root.root.string); |
| 944 | else if (!tdef && !ntdef) |
| 945 | (*_bfd_error_handler) |
| 946 | (_("%s: TLS reference in %B mismatches non-TLS reference in %B"), |
| 947 | tbfd, ntbfd, h->root.root.string); |
| 948 | else if (tdef) |
| 949 | (*_bfd_error_handler) |
| 950 | (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"), |
| 951 | tbfd, tsec, ntbfd, h->root.root.string); |
| 952 | else |
| 953 | (*_bfd_error_handler) |
| 954 | (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"), |
| 955 | tbfd, ntbfd, ntsec, h->root.root.string); |
| 956 | |
| 957 | bfd_set_error (bfd_error_bad_value); |
| 958 | return FALSE; |
| 959 | } |
| 960 | |
| 961 | /* We need to remember if a symbol has a definition in a dynamic |
| 962 | object or is weak in all dynamic objects. Internal and hidden |
| 963 | visibility will make it unavailable to dynamic objects. */ |
| 964 | if (newdyn && !h->dynamic_def) |
| 965 | { |
| 966 | if (!bfd_is_und_section (sec)) |
| 967 | h->dynamic_def = 1; |
| 968 | else |
| 969 | { |
| 970 | /* Check if this symbol is weak in all dynamic objects. If it |
| 971 | is the first time we see it in a dynamic object, we mark |
| 972 | if it is weak. Otherwise, we clear it. */ |
| 973 | if (!h->ref_dynamic) |
| 974 | { |
| 975 | if (bind == STB_WEAK) |
| 976 | h->dynamic_weak = 1; |
| 977 | } |
| 978 | else if (bind != STB_WEAK) |
| 979 | h->dynamic_weak = 0; |
| 980 | } |
| 981 | } |
| 982 | |
| 983 | /* If the old symbol has non-default visibility, we ignore the new |
| 984 | definition from a dynamic object. */ |
| 985 | if (newdyn |
| 986 | && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 987 | && !bfd_is_und_section (sec)) |
| 988 | { |
| 989 | *skip = TRUE; |
| 990 | /* Make sure this symbol is dynamic. */ |
| 991 | h->ref_dynamic = 1; |
| 992 | /* A protected symbol has external availability. Make sure it is |
| 993 | recorded as dynamic. |
| 994 | |
| 995 | FIXME: Should we check type and size for protected symbol? */ |
| 996 | if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| 997 | return bfd_elf_link_record_dynamic_symbol (info, h); |
| 998 | else |
| 999 | return TRUE; |
| 1000 | } |
| 1001 | else if (!newdyn |
| 1002 | && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT |
| 1003 | && h->def_dynamic) |
| 1004 | { |
| 1005 | /* If the new symbol with non-default visibility comes from a |
| 1006 | relocatable file and the old definition comes from a dynamic |
| 1007 | object, we remove the old definition. */ |
| 1008 | if ((*sym_hash)->root.type == bfd_link_hash_indirect) |
| 1009 | h = *sym_hash; |
| 1010 | |
| 1011 | if ((h->root.u.undef.next || info->hash->undefs_tail == &h->root) |
| 1012 | && bfd_is_und_section (sec)) |
| 1013 | { |
| 1014 | /* If the new symbol is undefined and the old symbol was |
| 1015 | also undefined before, we need to make sure |
| 1016 | _bfd_generic_link_add_one_symbol doesn't mess |
| 1017 | up the linker hash table undefs list. Since the old |
| 1018 | definition came from a dynamic object, it is still on the |
| 1019 | undefs list. */ |
| 1020 | h->root.type = bfd_link_hash_undefined; |
| 1021 | h->root.u.undef.abfd = abfd; |
| 1022 | } |
| 1023 | else |
| 1024 | { |
| 1025 | h->root.type = bfd_link_hash_new; |
| 1026 | h->root.u.undef.abfd = NULL; |
| 1027 | } |
| 1028 | |
| 1029 | if (h->def_dynamic) |
| 1030 | { |
| 1031 | h->def_dynamic = 0; |
| 1032 | h->ref_dynamic = 1; |
| 1033 | h->dynamic_def = 1; |
| 1034 | } |
| 1035 | /* FIXME: Should we check type and size for protected symbol? */ |
| 1036 | h->size = 0; |
| 1037 | h->type = 0; |
| 1038 | return TRUE; |
| 1039 | } |
| 1040 | |
| 1041 | /* Differentiate strong and weak symbols. */ |
| 1042 | newweak = bind == STB_WEAK; |
| 1043 | oldweak = (h->root.type == bfd_link_hash_defweak |
| 1044 | || h->root.type == bfd_link_hash_undefweak); |
| 1045 | |
| 1046 | /* If a new weak symbol definition comes from a regular file and the |
| 1047 | old symbol comes from a dynamic library, we treat the new one as |
| 1048 | strong. Similarly, an old weak symbol definition from a regular |
| 1049 | file is treated as strong when the new symbol comes from a dynamic |
| 1050 | library. Further, an old weak symbol from a dynamic library is |
| 1051 | treated as strong if the new symbol is from a dynamic library. |
| 1052 | This reflects the way glibc's ld.so works. |
| 1053 | |
| 1054 | Do this before setting *type_change_ok or *size_change_ok so that |
| 1055 | we warn properly when dynamic library symbols are overridden. */ |
| 1056 | |
| 1057 | if (newdef && !newdyn && olddyn) |
| 1058 | newweak = FALSE; |
| 1059 | if (olddef && newdyn) |
| 1060 | oldweak = FALSE; |
| 1061 | |
| 1062 | /* It's OK to change the type if either the existing symbol or the |
| 1063 | new symbol is weak. A type change is also OK if the old symbol |
| 1064 | is undefined and the new symbol is defined. */ |
| 1065 | |
| 1066 | if (oldweak |
| 1067 | || newweak |
| 1068 | || (newdef |
| 1069 | && h->root.type == bfd_link_hash_undefined)) |
| 1070 | *type_change_ok = TRUE; |
| 1071 | |
| 1072 | /* It's OK to change the size if either the existing symbol or the |
| 1073 | new symbol is weak, or if the old symbol is undefined. */ |
| 1074 | |
| 1075 | if (*type_change_ok |
| 1076 | || h->root.type == bfd_link_hash_undefined) |
| 1077 | *size_change_ok = TRUE; |
| 1078 | |
| 1079 | /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old |
| 1080 | symbol, respectively, appears to be a common symbol in a dynamic |
| 1081 | object. If a symbol appears in an uninitialized section, and is |
| 1082 | not weak, and is not a function, then it may be a common symbol |
| 1083 | which was resolved when the dynamic object was created. We want |
| 1084 | to treat such symbols specially, because they raise special |
| 1085 | considerations when setting the symbol size: if the symbol |
| 1086 | appears as a common symbol in a regular object, and the size in |
| 1087 | the regular object is larger, we must make sure that we use the |
| 1088 | larger size. This problematic case can always be avoided in C, |
| 1089 | but it must be handled correctly when using Fortran shared |
| 1090 | libraries. |
| 1091 | |
| 1092 | Note that if NEWDYNCOMMON is set, NEWDEF will be set, and |
| 1093 | likewise for OLDDYNCOMMON and OLDDEF. |
| 1094 | |
| 1095 | Note that this test is just a heuristic, and that it is quite |
| 1096 | possible to have an uninitialized symbol in a shared object which |
| 1097 | is really a definition, rather than a common symbol. This could |
| 1098 | lead to some minor confusion when the symbol really is a common |
| 1099 | symbol in some regular object. However, I think it will be |
| 1100 | harmless. */ |
| 1101 | |
| 1102 | if (newdyn |
| 1103 | && newdef |
| 1104 | && !newweak |
| 1105 | && (sec->flags & SEC_ALLOC) != 0 |
| 1106 | && (sec->flags & SEC_LOAD) == 0 |
| 1107 | && sym->st_size > 0 |
| 1108 | && ELF_ST_TYPE (sym->st_info) != STT_FUNC) |
| 1109 | newdyncommon = TRUE; |
| 1110 | else |
| 1111 | newdyncommon = FALSE; |
| 1112 | |
| 1113 | if (olddyn |
| 1114 | && olddef |
| 1115 | && h->root.type == bfd_link_hash_defined |
| 1116 | && h->def_dynamic |
| 1117 | && (h->root.u.def.section->flags & SEC_ALLOC) != 0 |
| 1118 | && (h->root.u.def.section->flags & SEC_LOAD) == 0 |
| 1119 | && h->size > 0 |
| 1120 | && h->type != STT_FUNC) |
| 1121 | olddyncommon = TRUE; |
| 1122 | else |
| 1123 | olddyncommon = FALSE; |
| 1124 | |
| 1125 | /* If both the old and the new symbols look like common symbols in a |
| 1126 | dynamic object, set the size of the symbol to the larger of the |
| 1127 | two. */ |
| 1128 | |
| 1129 | if (olddyncommon |
| 1130 | && newdyncommon |
| 1131 | && sym->st_size != h->size) |
| 1132 | { |
| 1133 | /* Since we think we have two common symbols, issue a multiple |
| 1134 | common warning if desired. Note that we only warn if the |
| 1135 | size is different. If the size is the same, we simply let |
| 1136 | the old symbol override the new one as normally happens with |
| 1137 | symbols defined in dynamic objects. */ |
| 1138 | |
| 1139 | if (! ((*info->callbacks->multiple_common) |
| 1140 | (info, h->root.root.string, oldbfd, bfd_link_hash_common, |
| 1141 | h->size, abfd, bfd_link_hash_common, sym->st_size))) |
| 1142 | return FALSE; |
| 1143 | |
| 1144 | if (sym->st_size > h->size) |
| 1145 | h->size = sym->st_size; |
| 1146 | |
| 1147 | *size_change_ok = TRUE; |
| 1148 | } |
| 1149 | |
| 1150 | /* If we are looking at a dynamic object, and we have found a |
| 1151 | definition, we need to see if the symbol was already defined by |
| 1152 | some other object. If so, we want to use the existing |
| 1153 | definition, and we do not want to report a multiple symbol |
| 1154 | definition error; we do this by clobbering *PSEC to be |
| 1155 | bfd_und_section_ptr. |
| 1156 | |
| 1157 | We treat a common symbol as a definition if the symbol in the |
| 1158 | shared library is a function, since common symbols always |
| 1159 | represent variables; this can cause confusion in principle, but |
| 1160 | any such confusion would seem to indicate an erroneous program or |
| 1161 | shared library. We also permit a common symbol in a regular |
| 1162 | object to override a weak symbol in a shared object. */ |
| 1163 | |
| 1164 | if (newdyn |
| 1165 | && newdef |
| 1166 | && (olddef |
| 1167 | || (h->root.type == bfd_link_hash_common |
| 1168 | && (newweak |
| 1169 | || ELF_ST_TYPE (sym->st_info) == STT_FUNC)))) |
| 1170 | { |
| 1171 | *override = TRUE; |
| 1172 | newdef = FALSE; |
| 1173 | newdyncommon = FALSE; |
| 1174 | |
| 1175 | *psec = sec = bfd_und_section_ptr; |
| 1176 | *size_change_ok = TRUE; |
| 1177 | |
| 1178 | /* If we get here when the old symbol is a common symbol, then |
| 1179 | we are explicitly letting it override a weak symbol or |
| 1180 | function in a dynamic object, and we don't want to warn about |
| 1181 | a type change. If the old symbol is a defined symbol, a type |
| 1182 | change warning may still be appropriate. */ |
| 1183 | |
| 1184 | if (h->root.type == bfd_link_hash_common) |
| 1185 | *type_change_ok = TRUE; |
| 1186 | } |
| 1187 | |
| 1188 | /* Handle the special case of an old common symbol merging with a |
| 1189 | new symbol which looks like a common symbol in a shared object. |
| 1190 | We change *PSEC and *PVALUE to make the new symbol look like a |
| 1191 | common symbol, and let _bfd_generic_link_add_one_symbol do the |
| 1192 | right thing. */ |
| 1193 | |
| 1194 | if (newdyncommon |
| 1195 | && h->root.type == bfd_link_hash_common) |
| 1196 | { |
| 1197 | *override = TRUE; |
| 1198 | newdef = FALSE; |
| 1199 | newdyncommon = FALSE; |
| 1200 | *pvalue = sym->st_size; |
| 1201 | *psec = sec = bfd_com_section_ptr; |
| 1202 | *size_change_ok = TRUE; |
| 1203 | } |
| 1204 | |
| 1205 | /* Skip weak definitions of symbols that are already defined. */ |
| 1206 | if (newdef && olddef && newweak && !oldweak) |
| 1207 | *skip = TRUE; |
| 1208 | |
| 1209 | /* If the old symbol is from a dynamic object, and the new symbol is |
| 1210 | a definition which is not from a dynamic object, then the new |
| 1211 | symbol overrides the old symbol. Symbols from regular files |
| 1212 | always take precedence over symbols from dynamic objects, even if |
| 1213 | they are defined after the dynamic object in the link. |
| 1214 | |
| 1215 | As above, we again permit a common symbol in a regular object to |
| 1216 | override a definition in a shared object if the shared object |
| 1217 | symbol is a function or is weak. */ |
| 1218 | |
| 1219 | flip = NULL; |
| 1220 | if (!newdyn |
| 1221 | && (newdef |
| 1222 | || (bfd_is_com_section (sec) |
| 1223 | && (oldweak |
| 1224 | || h->type == STT_FUNC))) |
| 1225 | && olddyn |
| 1226 | && olddef |
| 1227 | && h->def_dynamic) |
| 1228 | { |
| 1229 | /* Change the hash table entry to undefined, and let |
| 1230 | _bfd_generic_link_add_one_symbol do the right thing with the |
| 1231 | new definition. */ |
| 1232 | |
| 1233 | h->root.type = bfd_link_hash_undefined; |
| 1234 | h->root.u.undef.abfd = h->root.u.def.section->owner; |
| 1235 | *size_change_ok = TRUE; |
| 1236 | |
| 1237 | olddef = FALSE; |
| 1238 | olddyncommon = FALSE; |
| 1239 | |
| 1240 | /* We again permit a type change when a common symbol may be |
| 1241 | overriding a function. */ |
| 1242 | |
| 1243 | if (bfd_is_com_section (sec)) |
| 1244 | *type_change_ok = TRUE; |
| 1245 | |
| 1246 | if ((*sym_hash)->root.type == bfd_link_hash_indirect) |
| 1247 | flip = *sym_hash; |
| 1248 | else |
| 1249 | /* This union may have been set to be non-NULL when this symbol |
| 1250 | was seen in a dynamic object. We must force the union to be |
| 1251 | NULL, so that it is correct for a regular symbol. */ |
| 1252 | h->verinfo.vertree = NULL; |
| 1253 | } |
| 1254 | |
| 1255 | /* Handle the special case of a new common symbol merging with an |
| 1256 | old symbol that looks like it might be a common symbol defined in |
| 1257 | a shared object. Note that we have already handled the case in |
| 1258 | which a new common symbol should simply override the definition |
| 1259 | in the shared library. */ |
| 1260 | |
| 1261 | if (! newdyn |
| 1262 | && bfd_is_com_section (sec) |
| 1263 | && olddyncommon) |
| 1264 | { |
| 1265 | /* It would be best if we could set the hash table entry to a |
| 1266 | common symbol, but we don't know what to use for the section |
| 1267 | or the alignment. */ |
| 1268 | if (! ((*info->callbacks->multiple_common) |
| 1269 | (info, h->root.root.string, oldbfd, bfd_link_hash_common, |
| 1270 | h->size, abfd, bfd_link_hash_common, sym->st_size))) |
| 1271 | return FALSE; |
| 1272 | |
| 1273 | /* If the presumed common symbol in the dynamic object is |
| 1274 | larger, pretend that the new symbol has its size. */ |
| 1275 | |
| 1276 | if (h->size > *pvalue) |
| 1277 | *pvalue = h->size; |
| 1278 | |
| 1279 | /* We need to remember the alignment required by the symbol |
| 1280 | in the dynamic object. */ |
| 1281 | BFD_ASSERT (pold_alignment); |
| 1282 | *pold_alignment = h->root.u.def.section->alignment_power; |
| 1283 | |
| 1284 | olddef = FALSE; |
| 1285 | olddyncommon = FALSE; |
| 1286 | |
| 1287 | h->root.type = bfd_link_hash_undefined; |
| 1288 | h->root.u.undef.abfd = h->root.u.def.section->owner; |
| 1289 | |
| 1290 | *size_change_ok = TRUE; |
| 1291 | *type_change_ok = TRUE; |
| 1292 | |
| 1293 | if ((*sym_hash)->root.type == bfd_link_hash_indirect) |
| 1294 | flip = *sym_hash; |
| 1295 | else |
| 1296 | h->verinfo.vertree = NULL; |
| 1297 | } |
| 1298 | |
| 1299 | if (flip != NULL) |
| 1300 | { |
| 1301 | /* Handle the case where we had a versioned symbol in a dynamic |
| 1302 | library and now find a definition in a normal object. In this |
| 1303 | case, we make the versioned symbol point to the normal one. */ |
| 1304 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 1305 | flip->root.type = h->root.type; |
| 1306 | h->root.type = bfd_link_hash_indirect; |
| 1307 | h->root.u.i.link = (struct bfd_link_hash_entry *) flip; |
| 1308 | (*bed->elf_backend_copy_indirect_symbol) (bed, flip, h); |
| 1309 | flip->root.u.undef.abfd = h->root.u.undef.abfd; |
| 1310 | if (h->def_dynamic) |
| 1311 | { |
| 1312 | h->def_dynamic = 0; |
| 1313 | flip->ref_dynamic = 1; |
| 1314 | } |
| 1315 | } |
| 1316 | |
| 1317 | return TRUE; |
| 1318 | } |
| 1319 | |
| 1320 | /* This function is called to create an indirect symbol from the |
| 1321 | default for the symbol with the default version if needed. The |
| 1322 | symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We |
| 1323 | set DYNSYM if the new indirect symbol is dynamic. */ |
| 1324 | |
| 1325 | bfd_boolean |
| 1326 | _bfd_elf_add_default_symbol (bfd *abfd, |
| 1327 | struct bfd_link_info *info, |
| 1328 | struct elf_link_hash_entry *h, |
| 1329 | const char *name, |
| 1330 | Elf_Internal_Sym *sym, |
| 1331 | asection **psec, |
| 1332 | bfd_vma *value, |
| 1333 | bfd_boolean *dynsym, |
| 1334 | bfd_boolean override) |
| 1335 | { |
| 1336 | bfd_boolean type_change_ok; |
| 1337 | bfd_boolean size_change_ok; |
| 1338 | bfd_boolean skip; |
| 1339 | char *shortname; |
| 1340 | struct elf_link_hash_entry *hi; |
| 1341 | struct bfd_link_hash_entry *bh; |
| 1342 | const struct elf_backend_data *bed; |
| 1343 | bfd_boolean collect; |
| 1344 | bfd_boolean dynamic; |
| 1345 | char *p; |
| 1346 | size_t len, shortlen; |
| 1347 | asection *sec; |
| 1348 | |
| 1349 | /* If this symbol has a version, and it is the default version, we |
| 1350 | create an indirect symbol from the default name to the fully |
| 1351 | decorated name. This will cause external references which do not |
| 1352 | specify a version to be bound to this version of the symbol. */ |
| 1353 | p = strchr (name, ELF_VER_CHR); |
| 1354 | if (p == NULL || p[1] != ELF_VER_CHR) |
| 1355 | return TRUE; |
| 1356 | |
| 1357 | if (override) |
| 1358 | { |
| 1359 | /* We are overridden by an old definition. We need to check if we |
| 1360 | need to create the indirect symbol from the default name. */ |
| 1361 | hi = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, |
| 1362 | FALSE, FALSE); |
| 1363 | BFD_ASSERT (hi != NULL); |
| 1364 | if (hi == h) |
| 1365 | return TRUE; |
| 1366 | while (hi->root.type == bfd_link_hash_indirect |
| 1367 | || hi->root.type == bfd_link_hash_warning) |
| 1368 | { |
| 1369 | hi = (struct elf_link_hash_entry *) hi->root.u.i.link; |
| 1370 | if (hi == h) |
| 1371 | return TRUE; |
| 1372 | } |
| 1373 | } |
| 1374 | |
| 1375 | bed = get_elf_backend_data (abfd); |
| 1376 | collect = bed->collect; |
| 1377 | dynamic = (abfd->flags & DYNAMIC) != 0; |
| 1378 | |
| 1379 | shortlen = p - name; |
| 1380 | shortname = bfd_hash_allocate (&info->hash->table, shortlen + 1); |
| 1381 | if (shortname == NULL) |
| 1382 | return FALSE; |
| 1383 | memcpy (shortname, name, shortlen); |
| 1384 | shortname[shortlen] = '\0'; |
| 1385 | |
| 1386 | /* We are going to create a new symbol. Merge it with any existing |
| 1387 | symbol with this name. For the purposes of the merge, act as |
| 1388 | though we were defining the symbol we just defined, although we |
| 1389 | actually going to define an indirect symbol. */ |
| 1390 | type_change_ok = FALSE; |
| 1391 | size_change_ok = FALSE; |
| 1392 | sec = *psec; |
| 1393 | if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value, |
| 1394 | NULL, &hi, &skip, &override, |
| 1395 | &type_change_ok, &size_change_ok)) |
| 1396 | return FALSE; |
| 1397 | |
| 1398 | if (skip) |
| 1399 | goto nondefault; |
| 1400 | |
| 1401 | if (! override) |
| 1402 | { |
| 1403 | bh = &hi->root; |
| 1404 | if (! (_bfd_generic_link_add_one_symbol |
| 1405 | (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr, |
| 1406 | 0, name, FALSE, collect, &bh))) |
| 1407 | return FALSE; |
| 1408 | hi = (struct elf_link_hash_entry *) bh; |
| 1409 | } |
| 1410 | else |
| 1411 | { |
| 1412 | /* In this case the symbol named SHORTNAME is overriding the |
| 1413 | indirect symbol we want to add. We were planning on making |
| 1414 | SHORTNAME an indirect symbol referring to NAME. SHORTNAME |
| 1415 | is the name without a version. NAME is the fully versioned |
| 1416 | name, and it is the default version. |
| 1417 | |
| 1418 | Overriding means that we already saw a definition for the |
| 1419 | symbol SHORTNAME in a regular object, and it is overriding |
| 1420 | the symbol defined in the dynamic object. |
| 1421 | |
| 1422 | When this happens, we actually want to change NAME, the |
| 1423 | symbol we just added, to refer to SHORTNAME. This will cause |
| 1424 | references to NAME in the shared object to become references |
| 1425 | to SHORTNAME in the regular object. This is what we expect |
| 1426 | when we override a function in a shared object: that the |
| 1427 | references in the shared object will be mapped to the |
| 1428 | definition in the regular object. */ |
| 1429 | |
| 1430 | while (hi->root.type == bfd_link_hash_indirect |
| 1431 | || hi->root.type == bfd_link_hash_warning) |
| 1432 | hi = (struct elf_link_hash_entry *) hi->root.u.i.link; |
| 1433 | |
| 1434 | h->root.type = bfd_link_hash_indirect; |
| 1435 | h->root.u.i.link = (struct bfd_link_hash_entry *) hi; |
| 1436 | if (h->def_dynamic) |
| 1437 | { |
| 1438 | h->def_dynamic = 0; |
| 1439 | hi->ref_dynamic = 1; |
| 1440 | if (hi->ref_regular |
| 1441 | || hi->def_regular) |
| 1442 | { |
| 1443 | if (! bfd_elf_link_record_dynamic_symbol (info, hi)) |
| 1444 | return FALSE; |
| 1445 | } |
| 1446 | } |
| 1447 | |
| 1448 | /* Now set HI to H, so that the following code will set the |
| 1449 | other fields correctly. */ |
| 1450 | hi = h; |
| 1451 | } |
| 1452 | |
| 1453 | /* If there is a duplicate definition somewhere, then HI may not |
| 1454 | point to an indirect symbol. We will have reported an error to |
| 1455 | the user in that case. */ |
| 1456 | |
| 1457 | if (hi->root.type == bfd_link_hash_indirect) |
| 1458 | { |
| 1459 | struct elf_link_hash_entry *ht; |
| 1460 | |
| 1461 | ht = (struct elf_link_hash_entry *) hi->root.u.i.link; |
| 1462 | (*bed->elf_backend_copy_indirect_symbol) (bed, ht, hi); |
| 1463 | |
| 1464 | /* See if the new flags lead us to realize that the symbol must |
| 1465 | be dynamic. */ |
| 1466 | if (! *dynsym) |
| 1467 | { |
| 1468 | if (! dynamic) |
| 1469 | { |
| 1470 | if (info->shared |
| 1471 | || hi->ref_dynamic) |
| 1472 | *dynsym = TRUE; |
| 1473 | } |
| 1474 | else |
| 1475 | { |
| 1476 | if (hi->ref_regular) |
| 1477 | *dynsym = TRUE; |
| 1478 | } |
| 1479 | } |
| 1480 | } |
| 1481 | |
| 1482 | /* We also need to define an indirection from the nondefault version |
| 1483 | of the symbol. */ |
| 1484 | |
| 1485 | nondefault: |
| 1486 | len = strlen (name); |
| 1487 | shortname = bfd_hash_allocate (&info->hash->table, len); |
| 1488 | if (shortname == NULL) |
| 1489 | return FALSE; |
| 1490 | memcpy (shortname, name, shortlen); |
| 1491 | memcpy (shortname + shortlen, p + 1, len - shortlen); |
| 1492 | |
| 1493 | /* Once again, merge with any existing symbol. */ |
| 1494 | type_change_ok = FALSE; |
| 1495 | size_change_ok = FALSE; |
| 1496 | sec = *psec; |
| 1497 | if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value, |
| 1498 | NULL, &hi, &skip, &override, |
| 1499 | &type_change_ok, &size_change_ok)) |
| 1500 | return FALSE; |
| 1501 | |
| 1502 | if (skip) |
| 1503 | return TRUE; |
| 1504 | |
| 1505 | if (override) |
| 1506 | { |
| 1507 | /* Here SHORTNAME is a versioned name, so we don't expect to see |
| 1508 | the type of override we do in the case above unless it is |
| 1509 | overridden by a versioned definition. */ |
| 1510 | if (hi->root.type != bfd_link_hash_defined |
| 1511 | && hi->root.type != bfd_link_hash_defweak) |
| 1512 | (*_bfd_error_handler) |
| 1513 | (_("%B: unexpected redefinition of indirect versioned symbol `%s'"), |
| 1514 | abfd, shortname); |
| 1515 | } |
| 1516 | else |
| 1517 | { |
| 1518 | bh = &hi->root; |
| 1519 | if (! (_bfd_generic_link_add_one_symbol |
| 1520 | (info, abfd, shortname, BSF_INDIRECT, |
| 1521 | bfd_ind_section_ptr, 0, name, FALSE, collect, &bh))) |
| 1522 | return FALSE; |
| 1523 | hi = (struct elf_link_hash_entry *) bh; |
| 1524 | |
| 1525 | /* If there is a duplicate definition somewhere, then HI may not |
| 1526 | point to an indirect symbol. We will have reported an error |
| 1527 | to the user in that case. */ |
| 1528 | |
| 1529 | if (hi->root.type == bfd_link_hash_indirect) |
| 1530 | { |
| 1531 | (*bed->elf_backend_copy_indirect_symbol) (bed, h, hi); |
| 1532 | |
| 1533 | /* See if the new flags lead us to realize that the symbol |
| 1534 | must be dynamic. */ |
| 1535 | if (! *dynsym) |
| 1536 | { |
| 1537 | if (! dynamic) |
| 1538 | { |
| 1539 | if (info->shared |
| 1540 | || hi->ref_dynamic) |
| 1541 | *dynsym = TRUE; |
| 1542 | } |
| 1543 | else |
| 1544 | { |
| 1545 | if (hi->ref_regular) |
| 1546 | *dynsym = TRUE; |
| 1547 | } |
| 1548 | } |
| 1549 | } |
| 1550 | } |
| 1551 | |
| 1552 | return TRUE; |
| 1553 | } |
| 1554 | \f |
| 1555 | /* This routine is used to export all defined symbols into the dynamic |
| 1556 | symbol table. It is called via elf_link_hash_traverse. */ |
| 1557 | |
| 1558 | bfd_boolean |
| 1559 | _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data) |
| 1560 | { |
| 1561 | struct elf_info_failed *eif = data; |
| 1562 | |
| 1563 | /* Ignore indirect symbols. These are added by the versioning code. */ |
| 1564 | if (h->root.type == bfd_link_hash_indirect) |
| 1565 | return TRUE; |
| 1566 | |
| 1567 | if (h->root.type == bfd_link_hash_warning) |
| 1568 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1569 | |
| 1570 | if (h->dynindx == -1 |
| 1571 | && (h->def_regular |
| 1572 | || h->ref_regular)) |
| 1573 | { |
| 1574 | struct bfd_elf_version_tree *t; |
| 1575 | struct bfd_elf_version_expr *d; |
| 1576 | |
| 1577 | for (t = eif->verdefs; t != NULL; t = t->next) |
| 1578 | { |
| 1579 | if (t->globals.list != NULL) |
| 1580 | { |
| 1581 | d = (*t->match) (&t->globals, NULL, h->root.root.string); |
| 1582 | if (d != NULL) |
| 1583 | goto doit; |
| 1584 | } |
| 1585 | |
| 1586 | if (t->locals.list != NULL) |
| 1587 | { |
| 1588 | d = (*t->match) (&t->locals, NULL, h->root.root.string); |
| 1589 | if (d != NULL) |
| 1590 | return TRUE; |
| 1591 | } |
| 1592 | } |
| 1593 | |
| 1594 | if (!eif->verdefs) |
| 1595 | { |
| 1596 | doit: |
| 1597 | if (! bfd_elf_link_record_dynamic_symbol (eif->info, h)) |
| 1598 | { |
| 1599 | eif->failed = TRUE; |
| 1600 | return FALSE; |
| 1601 | } |
| 1602 | } |
| 1603 | } |
| 1604 | |
| 1605 | return TRUE; |
| 1606 | } |
| 1607 | \f |
| 1608 | /* Look through the symbols which are defined in other shared |
| 1609 | libraries and referenced here. Update the list of version |
| 1610 | dependencies. This will be put into the .gnu.version_r section. |
| 1611 | This function is called via elf_link_hash_traverse. */ |
| 1612 | |
| 1613 | bfd_boolean |
| 1614 | _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h, |
| 1615 | void *data) |
| 1616 | { |
| 1617 | struct elf_find_verdep_info *rinfo = data; |
| 1618 | Elf_Internal_Verneed *t; |
| 1619 | Elf_Internal_Vernaux *a; |
| 1620 | bfd_size_type amt; |
| 1621 | |
| 1622 | if (h->root.type == bfd_link_hash_warning) |
| 1623 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1624 | |
| 1625 | /* We only care about symbols defined in shared objects with version |
| 1626 | information. */ |
| 1627 | if (!h->def_dynamic |
| 1628 | || h->def_regular |
| 1629 | || h->dynindx == -1 |
| 1630 | || h->verinfo.verdef == NULL) |
| 1631 | return TRUE; |
| 1632 | |
| 1633 | /* See if we already know about this version. */ |
| 1634 | for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref) |
| 1635 | { |
| 1636 | if (t->vn_bfd != h->verinfo.verdef->vd_bfd) |
| 1637 | continue; |
| 1638 | |
| 1639 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 1640 | if (a->vna_nodename == h->verinfo.verdef->vd_nodename) |
| 1641 | return TRUE; |
| 1642 | |
| 1643 | break; |
| 1644 | } |
| 1645 | |
| 1646 | /* This is a new version. Add it to tree we are building. */ |
| 1647 | |
| 1648 | if (t == NULL) |
| 1649 | { |
| 1650 | amt = sizeof *t; |
| 1651 | t = bfd_zalloc (rinfo->output_bfd, amt); |
| 1652 | if (t == NULL) |
| 1653 | { |
| 1654 | rinfo->failed = TRUE; |
| 1655 | return FALSE; |
| 1656 | } |
| 1657 | |
| 1658 | t->vn_bfd = h->verinfo.verdef->vd_bfd; |
| 1659 | t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref; |
| 1660 | elf_tdata (rinfo->output_bfd)->verref = t; |
| 1661 | } |
| 1662 | |
| 1663 | amt = sizeof *a; |
| 1664 | a = bfd_zalloc (rinfo->output_bfd, amt); |
| 1665 | |
| 1666 | /* Note that we are copying a string pointer here, and testing it |
| 1667 | above. If bfd_elf_string_from_elf_section is ever changed to |
| 1668 | discard the string data when low in memory, this will have to be |
| 1669 | fixed. */ |
| 1670 | a->vna_nodename = h->verinfo.verdef->vd_nodename; |
| 1671 | |
| 1672 | a->vna_flags = h->verinfo.verdef->vd_flags; |
| 1673 | a->vna_nextptr = t->vn_auxptr; |
| 1674 | |
| 1675 | h->verinfo.verdef->vd_exp_refno = rinfo->vers; |
| 1676 | ++rinfo->vers; |
| 1677 | |
| 1678 | a->vna_other = h->verinfo.verdef->vd_exp_refno + 1; |
| 1679 | |
| 1680 | t->vn_auxptr = a; |
| 1681 | |
| 1682 | return TRUE; |
| 1683 | } |
| 1684 | |
| 1685 | /* Figure out appropriate versions for all the symbols. We may not |
| 1686 | have the version number script until we have read all of the input |
| 1687 | files, so until that point we don't know which symbols should be |
| 1688 | local. This function is called via elf_link_hash_traverse. */ |
| 1689 | |
| 1690 | bfd_boolean |
| 1691 | _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data) |
| 1692 | { |
| 1693 | struct elf_assign_sym_version_info *sinfo; |
| 1694 | struct bfd_link_info *info; |
| 1695 | const struct elf_backend_data *bed; |
| 1696 | struct elf_info_failed eif; |
| 1697 | char *p; |
| 1698 | bfd_size_type amt; |
| 1699 | |
| 1700 | sinfo = data; |
| 1701 | info = sinfo->info; |
| 1702 | |
| 1703 | if (h->root.type == bfd_link_hash_warning) |
| 1704 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1705 | |
| 1706 | /* Fix the symbol flags. */ |
| 1707 | eif.failed = FALSE; |
| 1708 | eif.info = info; |
| 1709 | if (! _bfd_elf_fix_symbol_flags (h, &eif)) |
| 1710 | { |
| 1711 | if (eif.failed) |
| 1712 | sinfo->failed = TRUE; |
| 1713 | return FALSE; |
| 1714 | } |
| 1715 | |
| 1716 | /* We only need version numbers for symbols defined in regular |
| 1717 | objects. */ |
| 1718 | if (!h->def_regular) |
| 1719 | return TRUE; |
| 1720 | |
| 1721 | bed = get_elf_backend_data (sinfo->output_bfd); |
| 1722 | p = strchr (h->root.root.string, ELF_VER_CHR); |
| 1723 | if (p != NULL && h->verinfo.vertree == NULL) |
| 1724 | { |
| 1725 | struct bfd_elf_version_tree *t; |
| 1726 | bfd_boolean hidden; |
| 1727 | |
| 1728 | hidden = TRUE; |
| 1729 | |
| 1730 | /* There are two consecutive ELF_VER_CHR characters if this is |
| 1731 | not a hidden symbol. */ |
| 1732 | ++p; |
| 1733 | if (*p == ELF_VER_CHR) |
| 1734 | { |
| 1735 | hidden = FALSE; |
| 1736 | ++p; |
| 1737 | } |
| 1738 | |
| 1739 | /* If there is no version string, we can just return out. */ |
| 1740 | if (*p == '\0') |
| 1741 | { |
| 1742 | if (hidden) |
| 1743 | h->hidden = 1; |
| 1744 | return TRUE; |
| 1745 | } |
| 1746 | |
| 1747 | /* Look for the version. If we find it, it is no longer weak. */ |
| 1748 | for (t = sinfo->verdefs; t != NULL; t = t->next) |
| 1749 | { |
| 1750 | if (strcmp (t->name, p) == 0) |
| 1751 | { |
| 1752 | size_t len; |
| 1753 | char *alc; |
| 1754 | struct bfd_elf_version_expr *d; |
| 1755 | |
| 1756 | len = p - h->root.root.string; |
| 1757 | alc = bfd_malloc (len); |
| 1758 | if (alc == NULL) |
| 1759 | return FALSE; |
| 1760 | memcpy (alc, h->root.root.string, len - 1); |
| 1761 | alc[len - 1] = '\0'; |
| 1762 | if (alc[len - 2] == ELF_VER_CHR) |
| 1763 | alc[len - 2] = '\0'; |
| 1764 | |
| 1765 | h->verinfo.vertree = t; |
| 1766 | t->used = TRUE; |
| 1767 | d = NULL; |
| 1768 | |
| 1769 | if (t->globals.list != NULL) |
| 1770 | d = (*t->match) (&t->globals, NULL, alc); |
| 1771 | |
| 1772 | /* See if there is anything to force this symbol to |
| 1773 | local scope. */ |
| 1774 | if (d == NULL && t->locals.list != NULL) |
| 1775 | { |
| 1776 | d = (*t->match) (&t->locals, NULL, alc); |
| 1777 | if (d != NULL |
| 1778 | && h->dynindx != -1 |
| 1779 | && ! info->export_dynamic) |
| 1780 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 1781 | } |
| 1782 | |
| 1783 | free (alc); |
| 1784 | break; |
| 1785 | } |
| 1786 | } |
| 1787 | |
| 1788 | /* If we are building an application, we need to create a |
| 1789 | version node for this version. */ |
| 1790 | if (t == NULL && info->executable) |
| 1791 | { |
| 1792 | struct bfd_elf_version_tree **pp; |
| 1793 | int version_index; |
| 1794 | |
| 1795 | /* If we aren't going to export this symbol, we don't need |
| 1796 | to worry about it. */ |
| 1797 | if (h->dynindx == -1) |
| 1798 | return TRUE; |
| 1799 | |
| 1800 | amt = sizeof *t; |
| 1801 | t = bfd_zalloc (sinfo->output_bfd, amt); |
| 1802 | if (t == NULL) |
| 1803 | { |
| 1804 | sinfo->failed = TRUE; |
| 1805 | return FALSE; |
| 1806 | } |
| 1807 | |
| 1808 | t->name = p; |
| 1809 | t->name_indx = (unsigned int) -1; |
| 1810 | t->used = TRUE; |
| 1811 | |
| 1812 | version_index = 1; |
| 1813 | /* Don't count anonymous version tag. */ |
| 1814 | if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0) |
| 1815 | version_index = 0; |
| 1816 | for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next) |
| 1817 | ++version_index; |
| 1818 | t->vernum = version_index; |
| 1819 | |
| 1820 | *pp = t; |
| 1821 | |
| 1822 | h->verinfo.vertree = t; |
| 1823 | } |
| 1824 | else if (t == NULL) |
| 1825 | { |
| 1826 | /* We could not find the version for a symbol when |
| 1827 | generating a shared archive. Return an error. */ |
| 1828 | (*_bfd_error_handler) |
| 1829 | (_("%B: undefined versioned symbol name %s"), |
| 1830 | sinfo->output_bfd, h->root.root.string); |
| 1831 | bfd_set_error (bfd_error_bad_value); |
| 1832 | sinfo->failed = TRUE; |
| 1833 | return FALSE; |
| 1834 | } |
| 1835 | |
| 1836 | if (hidden) |
| 1837 | h->hidden = 1; |
| 1838 | } |
| 1839 | |
| 1840 | /* If we don't have a version for this symbol, see if we can find |
| 1841 | something. */ |
| 1842 | if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL) |
| 1843 | { |
| 1844 | struct bfd_elf_version_tree *t; |
| 1845 | struct bfd_elf_version_tree *local_ver; |
| 1846 | struct bfd_elf_version_expr *d; |
| 1847 | |
| 1848 | /* See if can find what version this symbol is in. If the |
| 1849 | symbol is supposed to be local, then don't actually register |
| 1850 | it. */ |
| 1851 | local_ver = NULL; |
| 1852 | for (t = sinfo->verdefs; t != NULL; t = t->next) |
| 1853 | { |
| 1854 | if (t->globals.list != NULL) |
| 1855 | { |
| 1856 | bfd_boolean matched; |
| 1857 | |
| 1858 | matched = FALSE; |
| 1859 | d = NULL; |
| 1860 | while ((d = (*t->match) (&t->globals, d, |
| 1861 | h->root.root.string)) != NULL) |
| 1862 | if (d->symver) |
| 1863 | matched = TRUE; |
| 1864 | else |
| 1865 | { |
| 1866 | /* There is a version without definition. Make |
| 1867 | the symbol the default definition for this |
| 1868 | version. */ |
| 1869 | h->verinfo.vertree = t; |
| 1870 | local_ver = NULL; |
| 1871 | d->script = 1; |
| 1872 | break; |
| 1873 | } |
| 1874 | if (d != NULL) |
| 1875 | break; |
| 1876 | else if (matched) |
| 1877 | /* There is no undefined version for this symbol. Hide the |
| 1878 | default one. */ |
| 1879 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 1880 | } |
| 1881 | |
| 1882 | if (t->locals.list != NULL) |
| 1883 | { |
| 1884 | d = NULL; |
| 1885 | while ((d = (*t->match) (&t->locals, d, |
| 1886 | h->root.root.string)) != NULL) |
| 1887 | { |
| 1888 | local_ver = t; |
| 1889 | /* If the match is "*", keep looking for a more |
| 1890 | explicit, perhaps even global, match. |
| 1891 | XXX: Shouldn't this be !d->wildcard instead? */ |
| 1892 | if (d->pattern[0] != '*' || d->pattern[1] != '\0') |
| 1893 | break; |
| 1894 | } |
| 1895 | |
| 1896 | if (d != NULL) |
| 1897 | break; |
| 1898 | } |
| 1899 | } |
| 1900 | |
| 1901 | if (local_ver != NULL) |
| 1902 | { |
| 1903 | h->verinfo.vertree = local_ver; |
| 1904 | if (h->dynindx != -1 |
| 1905 | && ! info->export_dynamic) |
| 1906 | { |
| 1907 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 1908 | } |
| 1909 | } |
| 1910 | } |
| 1911 | |
| 1912 | return TRUE; |
| 1913 | } |
| 1914 | \f |
| 1915 | /* Read and swap the relocs from the section indicated by SHDR. This |
| 1916 | may be either a REL or a RELA section. The relocations are |
| 1917 | translated into RELA relocations and stored in INTERNAL_RELOCS, |
| 1918 | which should have already been allocated to contain enough space. |
| 1919 | The EXTERNAL_RELOCS are a buffer where the external form of the |
| 1920 | relocations should be stored. |
| 1921 | |
| 1922 | Returns FALSE if something goes wrong. */ |
| 1923 | |
| 1924 | static bfd_boolean |
| 1925 | elf_link_read_relocs_from_section (bfd *abfd, |
| 1926 | asection *sec, |
| 1927 | Elf_Internal_Shdr *shdr, |
| 1928 | void *external_relocs, |
| 1929 | Elf_Internal_Rela *internal_relocs) |
| 1930 | { |
| 1931 | const struct elf_backend_data *bed; |
| 1932 | void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *); |
| 1933 | const bfd_byte *erela; |
| 1934 | const bfd_byte *erelaend; |
| 1935 | Elf_Internal_Rela *irela; |
| 1936 | Elf_Internal_Shdr *symtab_hdr; |
| 1937 | size_t nsyms; |
| 1938 | |
| 1939 | /* Position ourselves at the start of the section. */ |
| 1940 | if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0) |
| 1941 | return FALSE; |
| 1942 | |
| 1943 | /* Read the relocations. */ |
| 1944 | if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size) |
| 1945 | return FALSE; |
| 1946 | |
| 1947 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1948 | nsyms = symtab_hdr->sh_size / symtab_hdr->sh_entsize; |
| 1949 | |
| 1950 | bed = get_elf_backend_data (abfd); |
| 1951 | |
| 1952 | /* Convert the external relocations to the internal format. */ |
| 1953 | if (shdr->sh_entsize == bed->s->sizeof_rel) |
| 1954 | swap_in = bed->s->swap_reloc_in; |
| 1955 | else if (shdr->sh_entsize == bed->s->sizeof_rela) |
| 1956 | swap_in = bed->s->swap_reloca_in; |
| 1957 | else |
| 1958 | { |
| 1959 | bfd_set_error (bfd_error_wrong_format); |
| 1960 | return FALSE; |
| 1961 | } |
| 1962 | |
| 1963 | erela = external_relocs; |
| 1964 | erelaend = erela + shdr->sh_size; |
| 1965 | irela = internal_relocs; |
| 1966 | while (erela < erelaend) |
| 1967 | { |
| 1968 | bfd_vma r_symndx; |
| 1969 | |
| 1970 | (*swap_in) (abfd, erela, irela); |
| 1971 | r_symndx = ELF32_R_SYM (irela->r_info); |
| 1972 | if (bed->s->arch_size == 64) |
| 1973 | r_symndx >>= 24; |
| 1974 | if ((size_t) r_symndx >= nsyms) |
| 1975 | { |
| 1976 | (*_bfd_error_handler) |
| 1977 | (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)" |
| 1978 | " for offset 0x%lx in section `%A'"), |
| 1979 | abfd, sec, |
| 1980 | (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset); |
| 1981 | bfd_set_error (bfd_error_bad_value); |
| 1982 | return FALSE; |
| 1983 | } |
| 1984 | irela += bed->s->int_rels_per_ext_rel; |
| 1985 | erela += shdr->sh_entsize; |
| 1986 | } |
| 1987 | |
| 1988 | return TRUE; |
| 1989 | } |
| 1990 | |
| 1991 | /* Read and swap the relocs for a section O. They may have been |
| 1992 | cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are |
| 1993 | not NULL, they are used as buffers to read into. They are known to |
| 1994 | be large enough. If the INTERNAL_RELOCS relocs argument is NULL, |
| 1995 | the return value is allocated using either malloc or bfd_alloc, |
| 1996 | according to the KEEP_MEMORY argument. If O has two relocation |
| 1997 | sections (both REL and RELA relocations), then the REL_HDR |
| 1998 | relocations will appear first in INTERNAL_RELOCS, followed by the |
| 1999 | REL_HDR2 relocations. */ |
| 2000 | |
| 2001 | Elf_Internal_Rela * |
| 2002 | _bfd_elf_link_read_relocs (bfd *abfd, |
| 2003 | asection *o, |
| 2004 | void *external_relocs, |
| 2005 | Elf_Internal_Rela *internal_relocs, |
| 2006 | bfd_boolean keep_memory) |
| 2007 | { |
| 2008 | Elf_Internal_Shdr *rel_hdr; |
| 2009 | void *alloc1 = NULL; |
| 2010 | Elf_Internal_Rela *alloc2 = NULL; |
| 2011 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 2012 | |
| 2013 | if (elf_section_data (o)->relocs != NULL) |
| 2014 | return elf_section_data (o)->relocs; |
| 2015 | |
| 2016 | if (o->reloc_count == 0) |
| 2017 | return NULL; |
| 2018 | |
| 2019 | rel_hdr = &elf_section_data (o)->rel_hdr; |
| 2020 | |
| 2021 | if (internal_relocs == NULL) |
| 2022 | { |
| 2023 | bfd_size_type size; |
| 2024 | |
| 2025 | size = o->reloc_count; |
| 2026 | size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela); |
| 2027 | if (keep_memory) |
| 2028 | internal_relocs = bfd_alloc (abfd, size); |
| 2029 | else |
| 2030 | internal_relocs = alloc2 = bfd_malloc (size); |
| 2031 | if (internal_relocs == NULL) |
| 2032 | goto error_return; |
| 2033 | } |
| 2034 | |
| 2035 | if (external_relocs == NULL) |
| 2036 | { |
| 2037 | bfd_size_type size = rel_hdr->sh_size; |
| 2038 | |
| 2039 | if (elf_section_data (o)->rel_hdr2) |
| 2040 | size += elf_section_data (o)->rel_hdr2->sh_size; |
| 2041 | alloc1 = bfd_malloc (size); |
| 2042 | if (alloc1 == NULL) |
| 2043 | goto error_return; |
| 2044 | external_relocs = alloc1; |
| 2045 | } |
| 2046 | |
| 2047 | if (!elf_link_read_relocs_from_section (abfd, o, rel_hdr, |
| 2048 | external_relocs, |
| 2049 | internal_relocs)) |
| 2050 | goto error_return; |
| 2051 | if (elf_section_data (o)->rel_hdr2 |
| 2052 | && (!elf_link_read_relocs_from_section |
| 2053 | (abfd, o, |
| 2054 | elf_section_data (o)->rel_hdr2, |
| 2055 | ((bfd_byte *) external_relocs) + rel_hdr->sh_size, |
| 2056 | internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr) |
| 2057 | * bed->s->int_rels_per_ext_rel)))) |
| 2058 | goto error_return; |
| 2059 | |
| 2060 | /* Cache the results for next time, if we can. */ |
| 2061 | if (keep_memory) |
| 2062 | elf_section_data (o)->relocs = internal_relocs; |
| 2063 | |
| 2064 | if (alloc1 != NULL) |
| 2065 | free (alloc1); |
| 2066 | |
| 2067 | /* Don't free alloc2, since if it was allocated we are passing it |
| 2068 | back (under the name of internal_relocs). */ |
| 2069 | |
| 2070 | return internal_relocs; |
| 2071 | |
| 2072 | error_return: |
| 2073 | if (alloc1 != NULL) |
| 2074 | free (alloc1); |
| 2075 | if (alloc2 != NULL) |
| 2076 | free (alloc2); |
| 2077 | return NULL; |
| 2078 | } |
| 2079 | |
| 2080 | /* Compute the size of, and allocate space for, REL_HDR which is the |
| 2081 | section header for a section containing relocations for O. */ |
| 2082 | |
| 2083 | bfd_boolean |
| 2084 | _bfd_elf_link_size_reloc_section (bfd *abfd, |
| 2085 | Elf_Internal_Shdr *rel_hdr, |
| 2086 | asection *o) |
| 2087 | { |
| 2088 | bfd_size_type reloc_count; |
| 2089 | bfd_size_type num_rel_hashes; |
| 2090 | |
| 2091 | /* Figure out how many relocations there will be. */ |
| 2092 | if (rel_hdr == &elf_section_data (o)->rel_hdr) |
| 2093 | reloc_count = elf_section_data (o)->rel_count; |
| 2094 | else |
| 2095 | reloc_count = elf_section_data (o)->rel_count2; |
| 2096 | |
| 2097 | num_rel_hashes = o->reloc_count; |
| 2098 | if (num_rel_hashes < reloc_count) |
| 2099 | num_rel_hashes = reloc_count; |
| 2100 | |
| 2101 | /* That allows us to calculate the size of the section. */ |
| 2102 | rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count; |
| 2103 | |
| 2104 | /* The contents field must last into write_object_contents, so we |
| 2105 | allocate it with bfd_alloc rather than malloc. Also since we |
| 2106 | cannot be sure that the contents will actually be filled in, |
| 2107 | we zero the allocated space. */ |
| 2108 | rel_hdr->contents = bfd_zalloc (abfd, rel_hdr->sh_size); |
| 2109 | if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0) |
| 2110 | return FALSE; |
| 2111 | |
| 2112 | /* We only allocate one set of hash entries, so we only do it the |
| 2113 | first time we are called. */ |
| 2114 | if (elf_section_data (o)->rel_hashes == NULL |
| 2115 | && num_rel_hashes) |
| 2116 | { |
| 2117 | struct elf_link_hash_entry **p; |
| 2118 | |
| 2119 | p = bfd_zmalloc (num_rel_hashes * sizeof (struct elf_link_hash_entry *)); |
| 2120 | if (p == NULL) |
| 2121 | return FALSE; |
| 2122 | |
| 2123 | elf_section_data (o)->rel_hashes = p; |
| 2124 | } |
| 2125 | |
| 2126 | return TRUE; |
| 2127 | } |
| 2128 | |
| 2129 | /* Copy the relocations indicated by the INTERNAL_RELOCS (which |
| 2130 | originated from the section given by INPUT_REL_HDR) to the |
| 2131 | OUTPUT_BFD. */ |
| 2132 | |
| 2133 | bfd_boolean |
| 2134 | _bfd_elf_link_output_relocs (bfd *output_bfd, |
| 2135 | asection *input_section, |
| 2136 | Elf_Internal_Shdr *input_rel_hdr, |
| 2137 | Elf_Internal_Rela *internal_relocs, |
| 2138 | struct elf_link_hash_entry **rel_hash |
| 2139 | ATTRIBUTE_UNUSED) |
| 2140 | { |
| 2141 | Elf_Internal_Rela *irela; |
| 2142 | Elf_Internal_Rela *irelaend; |
| 2143 | bfd_byte *erel; |
| 2144 | Elf_Internal_Shdr *output_rel_hdr; |
| 2145 | asection *output_section; |
| 2146 | unsigned int *rel_countp = NULL; |
| 2147 | const struct elf_backend_data *bed; |
| 2148 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
| 2149 | |
| 2150 | output_section = input_section->output_section; |
| 2151 | output_rel_hdr = NULL; |
| 2152 | |
| 2153 | if (elf_section_data (output_section)->rel_hdr.sh_entsize |
| 2154 | == input_rel_hdr->sh_entsize) |
| 2155 | { |
| 2156 | output_rel_hdr = &elf_section_data (output_section)->rel_hdr; |
| 2157 | rel_countp = &elf_section_data (output_section)->rel_count; |
| 2158 | } |
| 2159 | else if (elf_section_data (output_section)->rel_hdr2 |
| 2160 | && (elf_section_data (output_section)->rel_hdr2->sh_entsize |
| 2161 | == input_rel_hdr->sh_entsize)) |
| 2162 | { |
| 2163 | output_rel_hdr = elf_section_data (output_section)->rel_hdr2; |
| 2164 | rel_countp = &elf_section_data (output_section)->rel_count2; |
| 2165 | } |
| 2166 | else |
| 2167 | { |
| 2168 | (*_bfd_error_handler) |
| 2169 | (_("%B: relocation size mismatch in %B section %A"), |
| 2170 | output_bfd, input_section->owner, input_section); |
| 2171 | bfd_set_error (bfd_error_wrong_object_format); |
| 2172 | return FALSE; |
| 2173 | } |
| 2174 | |
| 2175 | bed = get_elf_backend_data (output_bfd); |
| 2176 | if (input_rel_hdr->sh_entsize == bed->s->sizeof_rel) |
| 2177 | swap_out = bed->s->swap_reloc_out; |
| 2178 | else if (input_rel_hdr->sh_entsize == bed->s->sizeof_rela) |
| 2179 | swap_out = bed->s->swap_reloca_out; |
| 2180 | else |
| 2181 | abort (); |
| 2182 | |
| 2183 | erel = output_rel_hdr->contents; |
| 2184 | erel += *rel_countp * input_rel_hdr->sh_entsize; |
| 2185 | irela = internal_relocs; |
| 2186 | irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr) |
| 2187 | * bed->s->int_rels_per_ext_rel); |
| 2188 | while (irela < irelaend) |
| 2189 | { |
| 2190 | (*swap_out) (output_bfd, irela, erel); |
| 2191 | irela += bed->s->int_rels_per_ext_rel; |
| 2192 | erel += input_rel_hdr->sh_entsize; |
| 2193 | } |
| 2194 | |
| 2195 | /* Bump the counter, so that we know where to add the next set of |
| 2196 | relocations. */ |
| 2197 | *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr); |
| 2198 | |
| 2199 | return TRUE; |
| 2200 | } |
| 2201 | \f |
| 2202 | /* Fix up the flags for a symbol. This handles various cases which |
| 2203 | can only be fixed after all the input files are seen. This is |
| 2204 | currently called by both adjust_dynamic_symbol and |
| 2205 | assign_sym_version, which is unnecessary but perhaps more robust in |
| 2206 | the face of future changes. */ |
| 2207 | |
| 2208 | bfd_boolean |
| 2209 | _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h, |
| 2210 | struct elf_info_failed *eif) |
| 2211 | { |
| 2212 | /* If this symbol was mentioned in a non-ELF file, try to set |
| 2213 | DEF_REGULAR and REF_REGULAR correctly. This is the only way to |
| 2214 | permit a non-ELF file to correctly refer to a symbol defined in |
| 2215 | an ELF dynamic object. */ |
| 2216 | if (h->non_elf) |
| 2217 | { |
| 2218 | while (h->root.type == bfd_link_hash_indirect) |
| 2219 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2220 | |
| 2221 | if (h->root.type != bfd_link_hash_defined |
| 2222 | && h->root.type != bfd_link_hash_defweak) |
| 2223 | { |
| 2224 | h->ref_regular = 1; |
| 2225 | h->ref_regular_nonweak = 1; |
| 2226 | } |
| 2227 | else |
| 2228 | { |
| 2229 | if (h->root.u.def.section->owner != NULL |
| 2230 | && (bfd_get_flavour (h->root.u.def.section->owner) |
| 2231 | == bfd_target_elf_flavour)) |
| 2232 | { |
| 2233 | h->ref_regular = 1; |
| 2234 | h->ref_regular_nonweak = 1; |
| 2235 | } |
| 2236 | else |
| 2237 | h->def_regular = 1; |
| 2238 | } |
| 2239 | |
| 2240 | if (h->dynindx == -1 |
| 2241 | && (h->def_dynamic |
| 2242 | || h->ref_dynamic)) |
| 2243 | { |
| 2244 | if (! bfd_elf_link_record_dynamic_symbol (eif->info, h)) |
| 2245 | { |
| 2246 | eif->failed = TRUE; |
| 2247 | return FALSE; |
| 2248 | } |
| 2249 | } |
| 2250 | } |
| 2251 | else |
| 2252 | { |
| 2253 | /* Unfortunately, NON_ELF is only correct if the symbol |
| 2254 | was first seen in a non-ELF file. Fortunately, if the symbol |
| 2255 | was first seen in an ELF file, we're probably OK unless the |
| 2256 | symbol was defined in a non-ELF file. Catch that case here. |
| 2257 | FIXME: We're still in trouble if the symbol was first seen in |
| 2258 | a dynamic object, and then later in a non-ELF regular object. */ |
| 2259 | if ((h->root.type == bfd_link_hash_defined |
| 2260 | || h->root.type == bfd_link_hash_defweak) |
| 2261 | && !h->def_regular |
| 2262 | && (h->root.u.def.section->owner != NULL |
| 2263 | ? (bfd_get_flavour (h->root.u.def.section->owner) |
| 2264 | != bfd_target_elf_flavour) |
| 2265 | : (bfd_is_abs_section (h->root.u.def.section) |
| 2266 | && !h->def_dynamic))) |
| 2267 | h->def_regular = 1; |
| 2268 | } |
| 2269 | |
| 2270 | /* If this is a final link, and the symbol was defined as a common |
| 2271 | symbol in a regular object file, and there was no definition in |
| 2272 | any dynamic object, then the linker will have allocated space for |
| 2273 | the symbol in a common section but the DEF_REGULAR |
| 2274 | flag will not have been set. */ |
| 2275 | if (h->root.type == bfd_link_hash_defined |
| 2276 | && !h->def_regular |
| 2277 | && h->ref_regular |
| 2278 | && !h->def_dynamic |
| 2279 | && (h->root.u.def.section->owner->flags & DYNAMIC) == 0) |
| 2280 | h->def_regular = 1; |
| 2281 | |
| 2282 | /* If -Bsymbolic was used (which means to bind references to global |
| 2283 | symbols to the definition within the shared object), and this |
| 2284 | symbol was defined in a regular object, then it actually doesn't |
| 2285 | need a PLT entry. Likewise, if the symbol has non-default |
| 2286 | visibility. If the symbol has hidden or internal visibility, we |
| 2287 | will force it local. */ |
| 2288 | if (h->needs_plt |
| 2289 | && eif->info->shared |
| 2290 | && is_elf_hash_table (eif->info->hash) |
| 2291 | && (eif->info->symbolic |
| 2292 | || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 2293 | && h->def_regular) |
| 2294 | { |
| 2295 | const struct elf_backend_data *bed; |
| 2296 | bfd_boolean force_local; |
| 2297 | |
| 2298 | bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj); |
| 2299 | |
| 2300 | force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL |
| 2301 | || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN); |
| 2302 | (*bed->elf_backend_hide_symbol) (eif->info, h, force_local); |
| 2303 | } |
| 2304 | |
| 2305 | /* If a weak undefined symbol has non-default visibility, we also |
| 2306 | hide it from the dynamic linker. */ |
| 2307 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 2308 | && h->root.type == bfd_link_hash_undefweak) |
| 2309 | { |
| 2310 | const struct elf_backend_data *bed; |
| 2311 | bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj); |
| 2312 | (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE); |
| 2313 | } |
| 2314 | |
| 2315 | /* If this is a weak defined symbol in a dynamic object, and we know |
| 2316 | the real definition in the dynamic object, copy interesting flags |
| 2317 | over to the real definition. */ |
| 2318 | if (h->u.weakdef != NULL) |
| 2319 | { |
| 2320 | struct elf_link_hash_entry *weakdef; |
| 2321 | |
| 2322 | weakdef = h->u.weakdef; |
| 2323 | if (h->root.type == bfd_link_hash_indirect) |
| 2324 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2325 | |
| 2326 | BFD_ASSERT (h->root.type == bfd_link_hash_defined |
| 2327 | || h->root.type == bfd_link_hash_defweak); |
| 2328 | BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined |
| 2329 | || weakdef->root.type == bfd_link_hash_defweak); |
| 2330 | BFD_ASSERT (weakdef->def_dynamic); |
| 2331 | |
| 2332 | /* If the real definition is defined by a regular object file, |
| 2333 | don't do anything special. See the longer description in |
| 2334 | _bfd_elf_adjust_dynamic_symbol, below. */ |
| 2335 | if (weakdef->def_regular) |
| 2336 | h->u.weakdef = NULL; |
| 2337 | else |
| 2338 | { |
| 2339 | const struct elf_backend_data *bed; |
| 2340 | |
| 2341 | bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj); |
| 2342 | (*bed->elf_backend_copy_indirect_symbol) (bed, weakdef, h); |
| 2343 | } |
| 2344 | } |
| 2345 | |
| 2346 | return TRUE; |
| 2347 | } |
| 2348 | |
| 2349 | /* Make the backend pick a good value for a dynamic symbol. This is |
| 2350 | called via elf_link_hash_traverse, and also calls itself |
| 2351 | recursively. */ |
| 2352 | |
| 2353 | bfd_boolean |
| 2354 | _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data) |
| 2355 | { |
| 2356 | struct elf_info_failed *eif = data; |
| 2357 | bfd *dynobj; |
| 2358 | const struct elf_backend_data *bed; |
| 2359 | |
| 2360 | if (! is_elf_hash_table (eif->info->hash)) |
| 2361 | return FALSE; |
| 2362 | |
| 2363 | if (h->root.type == bfd_link_hash_warning) |
| 2364 | { |
| 2365 | h->got = elf_hash_table (eif->info)->init_got_offset; |
| 2366 | h->plt = elf_hash_table (eif->info)->init_plt_offset; |
| 2367 | |
| 2368 | /* When warning symbols are created, they **replace** the "real" |
| 2369 | entry in the hash table, thus we never get to see the real |
| 2370 | symbol in a hash traversal. So look at it now. */ |
| 2371 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2372 | } |
| 2373 | |
| 2374 | /* Ignore indirect symbols. These are added by the versioning code. */ |
| 2375 | if (h->root.type == bfd_link_hash_indirect) |
| 2376 | return TRUE; |
| 2377 | |
| 2378 | /* Fix the symbol flags. */ |
| 2379 | if (! _bfd_elf_fix_symbol_flags (h, eif)) |
| 2380 | return FALSE; |
| 2381 | |
| 2382 | /* If this symbol does not require a PLT entry, and it is not |
| 2383 | defined by a dynamic object, or is not referenced by a regular |
| 2384 | object, ignore it. We do have to handle a weak defined symbol, |
| 2385 | even if no regular object refers to it, if we decided to add it |
| 2386 | to the dynamic symbol table. FIXME: Do we normally need to worry |
| 2387 | about symbols which are defined by one dynamic object and |
| 2388 | referenced by another one? */ |
| 2389 | if (!h->needs_plt |
| 2390 | && (h->def_regular |
| 2391 | || !h->def_dynamic |
| 2392 | || (!h->ref_regular |
| 2393 | && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1)))) |
| 2394 | { |
| 2395 | h->plt = elf_hash_table (eif->info)->init_plt_offset; |
| 2396 | return TRUE; |
| 2397 | } |
| 2398 | |
| 2399 | /* If we've already adjusted this symbol, don't do it again. This |
| 2400 | can happen via a recursive call. */ |
| 2401 | if (h->dynamic_adjusted) |
| 2402 | return TRUE; |
| 2403 | |
| 2404 | /* Don't look at this symbol again. Note that we must set this |
| 2405 | after checking the above conditions, because we may look at a |
| 2406 | symbol once, decide not to do anything, and then get called |
| 2407 | recursively later after REF_REGULAR is set below. */ |
| 2408 | h->dynamic_adjusted = 1; |
| 2409 | |
| 2410 | /* If this is a weak definition, and we know a real definition, and |
| 2411 | the real symbol is not itself defined by a regular object file, |
| 2412 | then get a good value for the real definition. We handle the |
| 2413 | real symbol first, for the convenience of the backend routine. |
| 2414 | |
| 2415 | Note that there is a confusing case here. If the real definition |
| 2416 | is defined by a regular object file, we don't get the real symbol |
| 2417 | from the dynamic object, but we do get the weak symbol. If the |
| 2418 | processor backend uses a COPY reloc, then if some routine in the |
| 2419 | dynamic object changes the real symbol, we will not see that |
| 2420 | change in the corresponding weak symbol. This is the way other |
| 2421 | ELF linkers work as well, and seems to be a result of the shared |
| 2422 | library model. |
| 2423 | |
| 2424 | I will clarify this issue. Most SVR4 shared libraries define the |
| 2425 | variable _timezone and define timezone as a weak synonym. The |
| 2426 | tzset call changes _timezone. If you write |
| 2427 | extern int timezone; |
| 2428 | int _timezone = 5; |
| 2429 | int main () { tzset (); printf ("%d %d\n", timezone, _timezone); } |
| 2430 | you might expect that, since timezone is a synonym for _timezone, |
| 2431 | the same number will print both times. However, if the processor |
| 2432 | backend uses a COPY reloc, then actually timezone will be copied |
| 2433 | into your process image, and, since you define _timezone |
| 2434 | yourself, _timezone will not. Thus timezone and _timezone will |
| 2435 | wind up at different memory locations. The tzset call will set |
| 2436 | _timezone, leaving timezone unchanged. */ |
| 2437 | |
| 2438 | if (h->u.weakdef != NULL) |
| 2439 | { |
| 2440 | /* If we get to this point, we know there is an implicit |
| 2441 | reference by a regular object file via the weak symbol H. |
| 2442 | FIXME: Is this really true? What if the traversal finds |
| 2443 | H->U.WEAKDEF before it finds H? */ |
| 2444 | h->u.weakdef->ref_regular = 1; |
| 2445 | |
| 2446 | if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif)) |
| 2447 | return FALSE; |
| 2448 | } |
| 2449 | |
| 2450 | /* If a symbol has no type and no size and does not require a PLT |
| 2451 | entry, then we are probably about to do the wrong thing here: we |
| 2452 | are probably going to create a COPY reloc for an empty object. |
| 2453 | This case can arise when a shared object is built with assembly |
| 2454 | code, and the assembly code fails to set the symbol type. */ |
| 2455 | if (h->size == 0 |
| 2456 | && h->type == STT_NOTYPE |
| 2457 | && !h->needs_plt) |
| 2458 | (*_bfd_error_handler) |
| 2459 | (_("warning: type and size of dynamic symbol `%s' are not defined"), |
| 2460 | h->root.root.string); |
| 2461 | |
| 2462 | dynobj = elf_hash_table (eif->info)->dynobj; |
| 2463 | bed = get_elf_backend_data (dynobj); |
| 2464 | if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h)) |
| 2465 | { |
| 2466 | eif->failed = TRUE; |
| 2467 | return FALSE; |
| 2468 | } |
| 2469 | |
| 2470 | return TRUE; |
| 2471 | } |
| 2472 | |
| 2473 | /* Adjust all external symbols pointing into SEC_MERGE sections |
| 2474 | to reflect the object merging within the sections. */ |
| 2475 | |
| 2476 | bfd_boolean |
| 2477 | _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data) |
| 2478 | { |
| 2479 | asection *sec; |
| 2480 | |
| 2481 | if (h->root.type == bfd_link_hash_warning) |
| 2482 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2483 | |
| 2484 | if ((h->root.type == bfd_link_hash_defined |
| 2485 | || h->root.type == bfd_link_hash_defweak) |
| 2486 | && ((sec = h->root.u.def.section)->flags & SEC_MERGE) |
| 2487 | && sec->sec_info_type == ELF_INFO_TYPE_MERGE) |
| 2488 | { |
| 2489 | bfd *output_bfd = data; |
| 2490 | |
| 2491 | h->root.u.def.value = |
| 2492 | _bfd_merged_section_offset (output_bfd, |
| 2493 | &h->root.u.def.section, |
| 2494 | elf_section_data (sec)->sec_info, |
| 2495 | h->root.u.def.value); |
| 2496 | } |
| 2497 | |
| 2498 | return TRUE; |
| 2499 | } |
| 2500 | |
| 2501 | /* Returns false if the symbol referred to by H should be considered |
| 2502 | to resolve local to the current module, and true if it should be |
| 2503 | considered to bind dynamically. */ |
| 2504 | |
| 2505 | bfd_boolean |
| 2506 | _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h, |
| 2507 | struct bfd_link_info *info, |
| 2508 | bfd_boolean ignore_protected) |
| 2509 | { |
| 2510 | bfd_boolean binding_stays_local_p; |
| 2511 | |
| 2512 | if (h == NULL) |
| 2513 | return FALSE; |
| 2514 | |
| 2515 | while (h->root.type == bfd_link_hash_indirect |
| 2516 | || h->root.type == bfd_link_hash_warning) |
| 2517 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2518 | |
| 2519 | /* If it was forced local, then clearly it's not dynamic. */ |
| 2520 | if (h->dynindx == -1) |
| 2521 | return FALSE; |
| 2522 | if (h->forced_local) |
| 2523 | return FALSE; |
| 2524 | |
| 2525 | /* Identify the cases where name binding rules say that a |
| 2526 | visible symbol resolves locally. */ |
| 2527 | binding_stays_local_p = info->executable || info->symbolic; |
| 2528 | |
| 2529 | switch (ELF_ST_VISIBILITY (h->other)) |
| 2530 | { |
| 2531 | case STV_INTERNAL: |
| 2532 | case STV_HIDDEN: |
| 2533 | return FALSE; |
| 2534 | |
| 2535 | case STV_PROTECTED: |
| 2536 | /* Proper resolution for function pointer equality may require |
| 2537 | that these symbols perhaps be resolved dynamically, even though |
| 2538 | we should be resolving them to the current module. */ |
| 2539 | if (!ignore_protected || h->type != STT_FUNC) |
| 2540 | binding_stays_local_p = TRUE; |
| 2541 | break; |
| 2542 | |
| 2543 | default: |
| 2544 | break; |
| 2545 | } |
| 2546 | |
| 2547 | /* If it isn't defined locally, then clearly it's dynamic. */ |
| 2548 | if (!h->def_regular) |
| 2549 | return TRUE; |
| 2550 | |
| 2551 | /* Otherwise, the symbol is dynamic if binding rules don't tell |
| 2552 | us that it remains local. */ |
| 2553 | return !binding_stays_local_p; |
| 2554 | } |
| 2555 | |
| 2556 | /* Return true if the symbol referred to by H should be considered |
| 2557 | to resolve local to the current module, and false otherwise. Differs |
| 2558 | from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of |
| 2559 | undefined symbols and weak symbols. */ |
| 2560 | |
| 2561 | bfd_boolean |
| 2562 | _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h, |
| 2563 | struct bfd_link_info *info, |
| 2564 | bfd_boolean local_protected) |
| 2565 | { |
| 2566 | /* If it's a local sym, of course we resolve locally. */ |
| 2567 | if (h == NULL) |
| 2568 | return TRUE; |
| 2569 | |
| 2570 | /* Common symbols that become definitions don't get the DEF_REGULAR |
| 2571 | flag set, so test it first, and don't bail out. */ |
| 2572 | if (ELF_COMMON_DEF_P (h)) |
| 2573 | /* Do nothing. */; |
| 2574 | /* If we don't have a definition in a regular file, then we can't |
| 2575 | resolve locally. The sym is either undefined or dynamic. */ |
| 2576 | else if (!h->def_regular) |
| 2577 | return FALSE; |
| 2578 | |
| 2579 | /* Forced local symbols resolve locally. */ |
| 2580 | if (h->forced_local) |
| 2581 | return TRUE; |
| 2582 | |
| 2583 | /* As do non-dynamic symbols. */ |
| 2584 | if (h->dynindx == -1) |
| 2585 | return TRUE; |
| 2586 | |
| 2587 | /* At this point, we know the symbol is defined and dynamic. In an |
| 2588 | executable it must resolve locally, likewise when building symbolic |
| 2589 | shared libraries. */ |
| 2590 | if (info->executable || info->symbolic) |
| 2591 | return TRUE; |
| 2592 | |
| 2593 | /* Now deal with defined dynamic symbols in shared libraries. Ones |
| 2594 | with default visibility might not resolve locally. */ |
| 2595 | if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
| 2596 | return FALSE; |
| 2597 | |
| 2598 | /* However, STV_HIDDEN or STV_INTERNAL ones must be local. */ |
| 2599 | if (ELF_ST_VISIBILITY (h->other) != STV_PROTECTED) |
| 2600 | return TRUE; |
| 2601 | |
| 2602 | /* STV_PROTECTED non-function symbols are local. */ |
| 2603 | if (h->type != STT_FUNC) |
| 2604 | return TRUE; |
| 2605 | |
| 2606 | /* Function pointer equality tests may require that STV_PROTECTED |
| 2607 | symbols be treated as dynamic symbols, even when we know that the |
| 2608 | dynamic linker will resolve them locally. */ |
| 2609 | return local_protected; |
| 2610 | } |
| 2611 | |
| 2612 | /* Caches some TLS segment info, and ensures that the TLS segment vma is |
| 2613 | aligned. Returns the first TLS output section. */ |
| 2614 | |
| 2615 | struct bfd_section * |
| 2616 | _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info) |
| 2617 | { |
| 2618 | struct bfd_section *sec, *tls; |
| 2619 | unsigned int align = 0; |
| 2620 | |
| 2621 | for (sec = obfd->sections; sec != NULL; sec = sec->next) |
| 2622 | if ((sec->flags & SEC_THREAD_LOCAL) != 0) |
| 2623 | break; |
| 2624 | tls = sec; |
| 2625 | |
| 2626 | for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next) |
| 2627 | if (sec->alignment_power > align) |
| 2628 | align = sec->alignment_power; |
| 2629 | |
| 2630 | elf_hash_table (info)->tls_sec = tls; |
| 2631 | |
| 2632 | /* Ensure the alignment of the first section is the largest alignment, |
| 2633 | so that the tls segment starts aligned. */ |
| 2634 | if (tls != NULL) |
| 2635 | tls->alignment_power = align; |
| 2636 | |
| 2637 | return tls; |
| 2638 | } |
| 2639 | |
| 2640 | /* Return TRUE iff this is a non-common, definition of a non-function symbol. */ |
| 2641 | static bfd_boolean |
| 2642 | is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED, |
| 2643 | Elf_Internal_Sym *sym) |
| 2644 | { |
| 2645 | /* Local symbols do not count, but target specific ones might. */ |
| 2646 | if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL |
| 2647 | && ELF_ST_BIND (sym->st_info) < STB_LOOS) |
| 2648 | return FALSE; |
| 2649 | |
| 2650 | /* Function symbols do not count. */ |
| 2651 | if (ELF_ST_TYPE (sym->st_info) == STT_FUNC) |
| 2652 | return FALSE; |
| 2653 | |
| 2654 | /* If the section is undefined, then so is the symbol. */ |
| 2655 | if (sym->st_shndx == SHN_UNDEF) |
| 2656 | return FALSE; |
| 2657 | |
| 2658 | /* If the symbol is defined in the common section, then |
| 2659 | it is a common definition and so does not count. */ |
| 2660 | if (sym->st_shndx == SHN_COMMON) |
| 2661 | return FALSE; |
| 2662 | |
| 2663 | /* If the symbol is in a target specific section then we |
| 2664 | must rely upon the backend to tell us what it is. */ |
| 2665 | if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS) |
| 2666 | /* FIXME - this function is not coded yet: |
| 2667 | |
| 2668 | return _bfd_is_global_symbol_definition (abfd, sym); |
| 2669 | |
| 2670 | Instead for now assume that the definition is not global, |
| 2671 | Even if this is wrong, at least the linker will behave |
| 2672 | in the same way that it used to do. */ |
| 2673 | return FALSE; |
| 2674 | |
| 2675 | return TRUE; |
| 2676 | } |
| 2677 | |
| 2678 | /* Search the symbol table of the archive element of the archive ABFD |
| 2679 | whose archive map contains a mention of SYMDEF, and determine if |
| 2680 | the symbol is defined in this element. */ |
| 2681 | static bfd_boolean |
| 2682 | elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef) |
| 2683 | { |
| 2684 | Elf_Internal_Shdr * hdr; |
| 2685 | bfd_size_type symcount; |
| 2686 | bfd_size_type extsymcount; |
| 2687 | bfd_size_type extsymoff; |
| 2688 | Elf_Internal_Sym *isymbuf; |
| 2689 | Elf_Internal_Sym *isym; |
| 2690 | Elf_Internal_Sym *isymend; |
| 2691 | bfd_boolean result; |
| 2692 | |
| 2693 | abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset); |
| 2694 | if (abfd == NULL) |
| 2695 | return FALSE; |
| 2696 | |
| 2697 | if (! bfd_check_format (abfd, bfd_object)) |
| 2698 | return FALSE; |
| 2699 | |
| 2700 | /* If we have already included the element containing this symbol in the |
| 2701 | link then we do not need to include it again. Just claim that any symbol |
| 2702 | it contains is not a definition, so that our caller will not decide to |
| 2703 | (re)include this element. */ |
| 2704 | if (abfd->archive_pass) |
| 2705 | return FALSE; |
| 2706 | |
| 2707 | /* Select the appropriate symbol table. */ |
| 2708 | if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0) |
| 2709 | hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2710 | else |
| 2711 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; |
| 2712 | |
| 2713 | symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym; |
| 2714 | |
| 2715 | /* The sh_info field of the symtab header tells us where the |
| 2716 | external symbols start. We don't care about the local symbols. */ |
| 2717 | if (elf_bad_symtab (abfd)) |
| 2718 | { |
| 2719 | extsymcount = symcount; |
| 2720 | extsymoff = 0; |
| 2721 | } |
| 2722 | else |
| 2723 | { |
| 2724 | extsymcount = symcount - hdr->sh_info; |
| 2725 | extsymoff = hdr->sh_info; |
| 2726 | } |
| 2727 | |
| 2728 | if (extsymcount == 0) |
| 2729 | return FALSE; |
| 2730 | |
| 2731 | /* Read in the symbol table. */ |
| 2732 | isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff, |
| 2733 | NULL, NULL, NULL); |
| 2734 | if (isymbuf == NULL) |
| 2735 | return FALSE; |
| 2736 | |
| 2737 | /* Scan the symbol table looking for SYMDEF. */ |
| 2738 | result = FALSE; |
| 2739 | for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++) |
| 2740 | { |
| 2741 | const char *name; |
| 2742 | |
| 2743 | name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, |
| 2744 | isym->st_name); |
| 2745 | if (name == NULL) |
| 2746 | break; |
| 2747 | |
| 2748 | if (strcmp (name, symdef->name) == 0) |
| 2749 | { |
| 2750 | result = is_global_data_symbol_definition (abfd, isym); |
| 2751 | break; |
| 2752 | } |
| 2753 | } |
| 2754 | |
| 2755 | free (isymbuf); |
| 2756 | |
| 2757 | return result; |
| 2758 | } |
| 2759 | \f |
| 2760 | /* Add an entry to the .dynamic table. */ |
| 2761 | |
| 2762 | bfd_boolean |
| 2763 | _bfd_elf_add_dynamic_entry (struct bfd_link_info *info, |
| 2764 | bfd_vma tag, |
| 2765 | bfd_vma val) |
| 2766 | { |
| 2767 | struct elf_link_hash_table *hash_table; |
| 2768 | const struct elf_backend_data *bed; |
| 2769 | asection *s; |
| 2770 | bfd_size_type newsize; |
| 2771 | bfd_byte *newcontents; |
| 2772 | Elf_Internal_Dyn dyn; |
| 2773 | |
| 2774 | hash_table = elf_hash_table (info); |
| 2775 | if (! is_elf_hash_table (hash_table)) |
| 2776 | return FALSE; |
| 2777 | |
| 2778 | if (info->warn_shared_textrel && info->shared && tag == DT_TEXTREL) |
| 2779 | _bfd_error_handler |
| 2780 | (_("warning: creating a DT_TEXTREL in a shared object.")); |
| 2781 | |
| 2782 | bed = get_elf_backend_data (hash_table->dynobj); |
| 2783 | s = bfd_get_section_by_name (hash_table->dynobj, ".dynamic"); |
| 2784 | BFD_ASSERT (s != NULL); |
| 2785 | |
| 2786 | newsize = s->size + bed->s->sizeof_dyn; |
| 2787 | newcontents = bfd_realloc (s->contents, newsize); |
| 2788 | if (newcontents == NULL) |
| 2789 | return FALSE; |
| 2790 | |
| 2791 | dyn.d_tag = tag; |
| 2792 | dyn.d_un.d_val = val; |
| 2793 | bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size); |
| 2794 | |
| 2795 | s->size = newsize; |
| 2796 | s->contents = newcontents; |
| 2797 | |
| 2798 | return TRUE; |
| 2799 | } |
| 2800 | |
| 2801 | /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true, |
| 2802 | otherwise just check whether one already exists. Returns -1 on error, |
| 2803 | 1 if a DT_NEEDED tag already exists, and 0 on success. */ |
| 2804 | |
| 2805 | static int |
| 2806 | elf_add_dt_needed_tag (bfd *abfd, |
| 2807 | struct bfd_link_info *info, |
| 2808 | const char *soname, |
| 2809 | bfd_boolean do_it) |
| 2810 | { |
| 2811 | struct elf_link_hash_table *hash_table; |
| 2812 | bfd_size_type oldsize; |
| 2813 | bfd_size_type strindex; |
| 2814 | |
| 2815 | if (!_bfd_elf_link_create_dynstrtab (abfd, info)) |
| 2816 | return -1; |
| 2817 | |
| 2818 | hash_table = elf_hash_table (info); |
| 2819 | oldsize = _bfd_elf_strtab_size (hash_table->dynstr); |
| 2820 | strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE); |
| 2821 | if (strindex == (bfd_size_type) -1) |
| 2822 | return -1; |
| 2823 | |
| 2824 | if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr)) |
| 2825 | { |
| 2826 | asection *sdyn; |
| 2827 | const struct elf_backend_data *bed; |
| 2828 | bfd_byte *extdyn; |
| 2829 | |
| 2830 | bed = get_elf_backend_data (hash_table->dynobj); |
| 2831 | sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic"); |
| 2832 | if (sdyn != NULL) |
| 2833 | for (extdyn = sdyn->contents; |
| 2834 | extdyn < sdyn->contents + sdyn->size; |
| 2835 | extdyn += bed->s->sizeof_dyn) |
| 2836 | { |
| 2837 | Elf_Internal_Dyn dyn; |
| 2838 | |
| 2839 | bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn); |
| 2840 | if (dyn.d_tag == DT_NEEDED |
| 2841 | && dyn.d_un.d_val == strindex) |
| 2842 | { |
| 2843 | _bfd_elf_strtab_delref (hash_table->dynstr, strindex); |
| 2844 | return 1; |
| 2845 | } |
| 2846 | } |
| 2847 | } |
| 2848 | |
| 2849 | if (do_it) |
| 2850 | { |
| 2851 | if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info)) |
| 2852 | return -1; |
| 2853 | |
| 2854 | if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex)) |
| 2855 | return -1; |
| 2856 | } |
| 2857 | else |
| 2858 | /* We were just checking for existence of the tag. */ |
| 2859 | _bfd_elf_strtab_delref (hash_table->dynstr, strindex); |
| 2860 | |
| 2861 | return 0; |
| 2862 | } |
| 2863 | |
| 2864 | /* Called via elf_link_hash_traverse, elf_smash_syms sets all symbols |
| 2865 | belonging to NOT_NEEDED to bfd_link_hash_new. We know there are no |
| 2866 | references from regular objects to these symbols. |
| 2867 | |
| 2868 | ??? Should we do something about references from other dynamic |
| 2869 | obects? If not, we potentially lose some warnings about undefined |
| 2870 | symbols. But how can we recover the initial undefined / undefweak |
| 2871 | state? */ |
| 2872 | |
| 2873 | struct elf_smash_syms_data |
| 2874 | { |
| 2875 | bfd *not_needed; |
| 2876 | struct elf_link_hash_table *htab; |
| 2877 | bfd_boolean twiddled; |
| 2878 | }; |
| 2879 | |
| 2880 | static bfd_boolean |
| 2881 | elf_smash_syms (struct elf_link_hash_entry *h, void *data) |
| 2882 | { |
| 2883 | struct elf_smash_syms_data *inf = (struct elf_smash_syms_data *) data; |
| 2884 | struct bfd_link_hash_entry *bh; |
| 2885 | |
| 2886 | switch (h->root.type) |
| 2887 | { |
| 2888 | default: |
| 2889 | case bfd_link_hash_new: |
| 2890 | return TRUE; |
| 2891 | |
| 2892 | case bfd_link_hash_undefined: |
| 2893 | if (h->root.u.undef.abfd != inf->not_needed) |
| 2894 | return TRUE; |
| 2895 | if (h->root.u.undef.weak != NULL |
| 2896 | && h->root.u.undef.weak != inf->not_needed) |
| 2897 | { |
| 2898 | /* Symbol was undefweak in u.undef.weak bfd, and has become |
| 2899 | undefined in as-needed lib. Restore weak. */ |
| 2900 | h->root.type = bfd_link_hash_undefweak; |
| 2901 | h->root.u.undef.abfd = h->root.u.undef.weak; |
| 2902 | if (h->root.u.undef.next != NULL |
| 2903 | || inf->htab->root.undefs_tail == &h->root) |
| 2904 | inf->twiddled = TRUE; |
| 2905 | return TRUE; |
| 2906 | } |
| 2907 | break; |
| 2908 | |
| 2909 | case bfd_link_hash_undefweak: |
| 2910 | if (h->root.u.undef.abfd != inf->not_needed) |
| 2911 | return TRUE; |
| 2912 | break; |
| 2913 | |
| 2914 | case bfd_link_hash_defined: |
| 2915 | case bfd_link_hash_defweak: |
| 2916 | if (h->root.u.def.section->owner != inf->not_needed) |
| 2917 | return TRUE; |
| 2918 | break; |
| 2919 | |
| 2920 | case bfd_link_hash_common: |
| 2921 | if (h->root.u.c.p->section->owner != inf->not_needed) |
| 2922 | return TRUE; |
| 2923 | break; |
| 2924 | |
| 2925 | case bfd_link_hash_warning: |
| 2926 | case bfd_link_hash_indirect: |
| 2927 | elf_smash_syms ((struct elf_link_hash_entry *) h->root.u.i.link, data); |
| 2928 | if (h->root.u.i.link->type != bfd_link_hash_new) |
| 2929 | return TRUE; |
| 2930 | if (h->root.u.i.link->u.undef.abfd != inf->not_needed) |
| 2931 | return TRUE; |
| 2932 | break; |
| 2933 | } |
| 2934 | |
| 2935 | /* There is no way we can undo symbol table state from defined or |
| 2936 | defweak back to undefined. */ |
| 2937 | if (h->ref_regular) |
| 2938 | abort (); |
| 2939 | |
| 2940 | /* Set sym back to newly created state, but keep undef.next if it is |
| 2941 | being used as a list pointer. */ |
| 2942 | bh = h->root.u.undef.next; |
| 2943 | if (bh == &h->root) |
| 2944 | bh = NULL; |
| 2945 | if (bh != NULL || inf->htab->root.undefs_tail == &h->root) |
| 2946 | inf->twiddled = TRUE; |
| 2947 | (*inf->htab->root.table.newfunc) (&h->root.root, |
| 2948 | &inf->htab->root.table, |
| 2949 | h->root.root.string); |
| 2950 | h->root.u.undef.next = bh; |
| 2951 | h->root.u.undef.abfd = inf->not_needed; |
| 2952 | h->non_elf = 0; |
| 2953 | return TRUE; |
| 2954 | } |
| 2955 | |
| 2956 | /* Sort symbol by value and section. */ |
| 2957 | static int |
| 2958 | elf_sort_symbol (const void *arg1, const void *arg2) |
| 2959 | { |
| 2960 | const struct elf_link_hash_entry *h1; |
| 2961 | const struct elf_link_hash_entry *h2; |
| 2962 | bfd_signed_vma vdiff; |
| 2963 | |
| 2964 | h1 = *(const struct elf_link_hash_entry **) arg1; |
| 2965 | h2 = *(const struct elf_link_hash_entry **) arg2; |
| 2966 | vdiff = h1->root.u.def.value - h2->root.u.def.value; |
| 2967 | if (vdiff != 0) |
| 2968 | return vdiff > 0 ? 1 : -1; |
| 2969 | else |
| 2970 | { |
| 2971 | long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id; |
| 2972 | if (sdiff != 0) |
| 2973 | return sdiff > 0 ? 1 : -1; |
| 2974 | } |
| 2975 | return 0; |
| 2976 | } |
| 2977 | |
| 2978 | /* This function is used to adjust offsets into .dynstr for |
| 2979 | dynamic symbols. This is called via elf_link_hash_traverse. */ |
| 2980 | |
| 2981 | static bfd_boolean |
| 2982 | elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data) |
| 2983 | { |
| 2984 | struct elf_strtab_hash *dynstr = data; |
| 2985 | |
| 2986 | if (h->root.type == bfd_link_hash_warning) |
| 2987 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2988 | |
| 2989 | if (h->dynindx != -1) |
| 2990 | h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index); |
| 2991 | return TRUE; |
| 2992 | } |
| 2993 | |
| 2994 | /* Assign string offsets in .dynstr, update all structures referencing |
| 2995 | them. */ |
| 2996 | |
| 2997 | static bfd_boolean |
| 2998 | elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info) |
| 2999 | { |
| 3000 | struct elf_link_hash_table *hash_table = elf_hash_table (info); |
| 3001 | struct elf_link_local_dynamic_entry *entry; |
| 3002 | struct elf_strtab_hash *dynstr = hash_table->dynstr; |
| 3003 | bfd *dynobj = hash_table->dynobj; |
| 3004 | asection *sdyn; |
| 3005 | bfd_size_type size; |
| 3006 | const struct elf_backend_data *bed; |
| 3007 | bfd_byte *extdyn; |
| 3008 | |
| 3009 | _bfd_elf_strtab_finalize (dynstr); |
| 3010 | size = _bfd_elf_strtab_size (dynstr); |
| 3011 | |
| 3012 | bed = get_elf_backend_data (dynobj); |
| 3013 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 3014 | BFD_ASSERT (sdyn != NULL); |
| 3015 | |
| 3016 | /* Update all .dynamic entries referencing .dynstr strings. */ |
| 3017 | for (extdyn = sdyn->contents; |
| 3018 | extdyn < sdyn->contents + sdyn->size; |
| 3019 | extdyn += bed->s->sizeof_dyn) |
| 3020 | { |
| 3021 | Elf_Internal_Dyn dyn; |
| 3022 | |
| 3023 | bed->s->swap_dyn_in (dynobj, extdyn, &dyn); |
| 3024 | switch (dyn.d_tag) |
| 3025 | { |
| 3026 | case DT_STRSZ: |
| 3027 | dyn.d_un.d_val = size; |
| 3028 | break; |
| 3029 | case DT_NEEDED: |
| 3030 | case DT_SONAME: |
| 3031 | case DT_RPATH: |
| 3032 | case DT_RUNPATH: |
| 3033 | case DT_FILTER: |
| 3034 | case DT_AUXILIARY: |
| 3035 | dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val); |
| 3036 | break; |
| 3037 | default: |
| 3038 | continue; |
| 3039 | } |
| 3040 | bed->s->swap_dyn_out (dynobj, &dyn, extdyn); |
| 3041 | } |
| 3042 | |
| 3043 | /* Now update local dynamic symbols. */ |
| 3044 | for (entry = hash_table->dynlocal; entry ; entry = entry->next) |
| 3045 | entry->isym.st_name = _bfd_elf_strtab_offset (dynstr, |
| 3046 | entry->isym.st_name); |
| 3047 | |
| 3048 | /* And the rest of dynamic symbols. */ |
| 3049 | elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr); |
| 3050 | |
| 3051 | /* Adjust version definitions. */ |
| 3052 | if (elf_tdata (output_bfd)->cverdefs) |
| 3053 | { |
| 3054 | asection *s; |
| 3055 | bfd_byte *p; |
| 3056 | bfd_size_type i; |
| 3057 | Elf_Internal_Verdef def; |
| 3058 | Elf_Internal_Verdaux defaux; |
| 3059 | |
| 3060 | s = bfd_get_section_by_name (dynobj, ".gnu.version_d"); |
| 3061 | p = s->contents; |
| 3062 | do |
| 3063 | { |
| 3064 | _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p, |
| 3065 | &def); |
| 3066 | p += sizeof (Elf_External_Verdef); |
| 3067 | if (def.vd_aux != sizeof (Elf_External_Verdef)) |
| 3068 | continue; |
| 3069 | for (i = 0; i < def.vd_cnt; ++i) |
| 3070 | { |
| 3071 | _bfd_elf_swap_verdaux_in (output_bfd, |
| 3072 | (Elf_External_Verdaux *) p, &defaux); |
| 3073 | defaux.vda_name = _bfd_elf_strtab_offset (dynstr, |
| 3074 | defaux.vda_name); |
| 3075 | _bfd_elf_swap_verdaux_out (output_bfd, |
| 3076 | &defaux, (Elf_External_Verdaux *) p); |
| 3077 | p += sizeof (Elf_External_Verdaux); |
| 3078 | } |
| 3079 | } |
| 3080 | while (def.vd_next); |
| 3081 | } |
| 3082 | |
| 3083 | /* Adjust version references. */ |
| 3084 | if (elf_tdata (output_bfd)->verref) |
| 3085 | { |
| 3086 | asection *s; |
| 3087 | bfd_byte *p; |
| 3088 | bfd_size_type i; |
| 3089 | Elf_Internal_Verneed need; |
| 3090 | Elf_Internal_Vernaux needaux; |
| 3091 | |
| 3092 | s = bfd_get_section_by_name (dynobj, ".gnu.version_r"); |
| 3093 | p = s->contents; |
| 3094 | do |
| 3095 | { |
| 3096 | _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p, |
| 3097 | &need); |
| 3098 | need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file); |
| 3099 | _bfd_elf_swap_verneed_out (output_bfd, &need, |
| 3100 | (Elf_External_Verneed *) p); |
| 3101 | p += sizeof (Elf_External_Verneed); |
| 3102 | for (i = 0; i < need.vn_cnt; ++i) |
| 3103 | { |
| 3104 | _bfd_elf_swap_vernaux_in (output_bfd, |
| 3105 | (Elf_External_Vernaux *) p, &needaux); |
| 3106 | needaux.vna_name = _bfd_elf_strtab_offset (dynstr, |
| 3107 | needaux.vna_name); |
| 3108 | _bfd_elf_swap_vernaux_out (output_bfd, |
| 3109 | &needaux, |
| 3110 | (Elf_External_Vernaux *) p); |
| 3111 | p += sizeof (Elf_External_Vernaux); |
| 3112 | } |
| 3113 | } |
| 3114 | while (need.vn_next); |
| 3115 | } |
| 3116 | |
| 3117 | return TRUE; |
| 3118 | } |
| 3119 | \f |
| 3120 | /* Add symbols from an ELF object file to the linker hash table. */ |
| 3121 | |
| 3122 | static bfd_boolean |
| 3123 | elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info) |
| 3124 | { |
| 3125 | bfd_boolean (*add_symbol_hook) |
| 3126 | (bfd *, struct bfd_link_info *, Elf_Internal_Sym *, |
| 3127 | const char **, flagword *, asection **, bfd_vma *); |
| 3128 | bfd_boolean (*check_relocs) |
| 3129 | (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *); |
| 3130 | bfd_boolean (*check_directives) |
| 3131 | (bfd *, struct bfd_link_info *); |
| 3132 | bfd_boolean collect; |
| 3133 | Elf_Internal_Shdr *hdr; |
| 3134 | bfd_size_type symcount; |
| 3135 | bfd_size_type extsymcount; |
| 3136 | bfd_size_type extsymoff; |
| 3137 | struct elf_link_hash_entry **sym_hash; |
| 3138 | bfd_boolean dynamic; |
| 3139 | Elf_External_Versym *extversym = NULL; |
| 3140 | Elf_External_Versym *ever; |
| 3141 | struct elf_link_hash_entry *weaks; |
| 3142 | struct elf_link_hash_entry **nondeflt_vers = NULL; |
| 3143 | bfd_size_type nondeflt_vers_cnt = 0; |
| 3144 | Elf_Internal_Sym *isymbuf = NULL; |
| 3145 | Elf_Internal_Sym *isym; |
| 3146 | Elf_Internal_Sym *isymend; |
| 3147 | const struct elf_backend_data *bed; |
| 3148 | bfd_boolean add_needed; |
| 3149 | struct elf_link_hash_table * hash_table; |
| 3150 | bfd_size_type amt; |
| 3151 | |
| 3152 | hash_table = elf_hash_table (info); |
| 3153 | |
| 3154 | bed = get_elf_backend_data (abfd); |
| 3155 | add_symbol_hook = bed->elf_add_symbol_hook; |
| 3156 | collect = bed->collect; |
| 3157 | |
| 3158 | if ((abfd->flags & DYNAMIC) == 0) |
| 3159 | dynamic = FALSE; |
| 3160 | else |
| 3161 | { |
| 3162 | dynamic = TRUE; |
| 3163 | |
| 3164 | /* You can't use -r against a dynamic object. Also, there's no |
| 3165 | hope of using a dynamic object which does not exactly match |
| 3166 | the format of the output file. */ |
| 3167 | if (info->relocatable |
| 3168 | || !is_elf_hash_table (hash_table) |
| 3169 | || hash_table->root.creator != abfd->xvec) |
| 3170 | { |
| 3171 | if (info->relocatable) |
| 3172 | bfd_set_error (bfd_error_invalid_operation); |
| 3173 | else |
| 3174 | bfd_set_error (bfd_error_wrong_format); |
| 3175 | goto error_return; |
| 3176 | } |
| 3177 | } |
| 3178 | |
| 3179 | /* As a GNU extension, any input sections which are named |
| 3180 | .gnu.warning.SYMBOL are treated as warning symbols for the given |
| 3181 | symbol. This differs from .gnu.warning sections, which generate |
| 3182 | warnings when they are included in an output file. */ |
| 3183 | if (info->executable) |
| 3184 | { |
| 3185 | asection *s; |
| 3186 | |
| 3187 | for (s = abfd->sections; s != NULL; s = s->next) |
| 3188 | { |
| 3189 | const char *name; |
| 3190 | |
| 3191 | name = bfd_get_section_name (abfd, s); |
| 3192 | if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0) |
| 3193 | { |
| 3194 | char *msg; |
| 3195 | bfd_size_type sz; |
| 3196 | |
| 3197 | name += sizeof ".gnu.warning." - 1; |
| 3198 | |
| 3199 | /* If this is a shared object, then look up the symbol |
| 3200 | in the hash table. If it is there, and it is already |
| 3201 | been defined, then we will not be using the entry |
| 3202 | from this shared object, so we don't need to warn. |
| 3203 | FIXME: If we see the definition in a regular object |
| 3204 | later on, we will warn, but we shouldn't. The only |
| 3205 | fix is to keep track of what warnings we are supposed |
| 3206 | to emit, and then handle them all at the end of the |
| 3207 | link. */ |
| 3208 | if (dynamic) |
| 3209 | { |
| 3210 | struct elf_link_hash_entry *h; |
| 3211 | |
| 3212 | h = elf_link_hash_lookup (hash_table, name, |
| 3213 | FALSE, FALSE, TRUE); |
| 3214 | |
| 3215 | /* FIXME: What about bfd_link_hash_common? */ |
| 3216 | if (h != NULL |
| 3217 | && (h->root.type == bfd_link_hash_defined |
| 3218 | || h->root.type == bfd_link_hash_defweak)) |
| 3219 | { |
| 3220 | /* We don't want to issue this warning. Clobber |
| 3221 | the section size so that the warning does not |
| 3222 | get copied into the output file. */ |
| 3223 | s->size = 0; |
| 3224 | continue; |
| 3225 | } |
| 3226 | } |
| 3227 | |
| 3228 | sz = s->size; |
| 3229 | msg = bfd_alloc (abfd, sz + 1); |
| 3230 | if (msg == NULL) |
| 3231 | goto error_return; |
| 3232 | |
| 3233 | if (! bfd_get_section_contents (abfd, s, msg, 0, sz)) |
| 3234 | goto error_return; |
| 3235 | |
| 3236 | msg[sz] = '\0'; |
| 3237 | |
| 3238 | if (! (_bfd_generic_link_add_one_symbol |
| 3239 | (info, abfd, name, BSF_WARNING, s, 0, msg, |
| 3240 | FALSE, collect, NULL))) |
| 3241 | goto error_return; |
| 3242 | |
| 3243 | if (! info->relocatable) |
| 3244 | { |
| 3245 | /* Clobber the section size so that the warning does |
| 3246 | not get copied into the output file. */ |
| 3247 | s->size = 0; |
| 3248 | |
| 3249 | /* Also set SEC_EXCLUDE, so that symbols defined in |
| 3250 | the warning section don't get copied to the output. */ |
| 3251 | s->flags |= SEC_EXCLUDE; |
| 3252 | } |
| 3253 | } |
| 3254 | } |
| 3255 | } |
| 3256 | |
| 3257 | add_needed = TRUE; |
| 3258 | if (! dynamic) |
| 3259 | { |
| 3260 | /* If we are creating a shared library, create all the dynamic |
| 3261 | sections immediately. We need to attach them to something, |
| 3262 | so we attach them to this BFD, provided it is the right |
| 3263 | format. FIXME: If there are no input BFD's of the same |
| 3264 | format as the output, we can't make a shared library. */ |
| 3265 | if (info->shared |
| 3266 | && is_elf_hash_table (hash_table) |
| 3267 | && hash_table->root.creator == abfd->xvec |
| 3268 | && ! hash_table->dynamic_sections_created) |
| 3269 | { |
| 3270 | if (! _bfd_elf_link_create_dynamic_sections (abfd, info)) |
| 3271 | goto error_return; |
| 3272 | } |
| 3273 | } |
| 3274 | else if (!is_elf_hash_table (hash_table)) |
| 3275 | goto error_return; |
| 3276 | else |
| 3277 | { |
| 3278 | asection *s; |
| 3279 | const char *soname = NULL; |
| 3280 | struct bfd_link_needed_list *rpath = NULL, *runpath = NULL; |
| 3281 | int ret; |
| 3282 | |
| 3283 | /* ld --just-symbols and dynamic objects don't mix very well. |
| 3284 | Test for --just-symbols by looking at info set up by |
| 3285 | _bfd_elf_link_just_syms. */ |
| 3286 | if ((s = abfd->sections) != NULL |
| 3287 | && s->sec_info_type == ELF_INFO_TYPE_JUST_SYMS) |
| 3288 | goto error_return; |
| 3289 | |
| 3290 | /* If this dynamic lib was specified on the command line with |
| 3291 | --as-needed in effect, then we don't want to add a DT_NEEDED |
| 3292 | tag unless the lib is actually used. Similary for libs brought |
| 3293 | in by another lib's DT_NEEDED. When --no-add-needed is used |
| 3294 | on a dynamic lib, we don't want to add a DT_NEEDED entry for |
| 3295 | any dynamic library in DT_NEEDED tags in the dynamic lib at |
| 3296 | all. */ |
| 3297 | add_needed = (elf_dyn_lib_class (abfd) |
| 3298 | & (DYN_AS_NEEDED | DYN_DT_NEEDED |
| 3299 | | DYN_NO_NEEDED)) == 0; |
| 3300 | |
| 3301 | s = bfd_get_section_by_name (abfd, ".dynamic"); |
| 3302 | if (s != NULL) |
| 3303 | { |
| 3304 | bfd_byte *dynbuf; |
| 3305 | bfd_byte *extdyn; |
| 3306 | int elfsec; |
| 3307 | unsigned long shlink; |
| 3308 | |
| 3309 | if (!bfd_malloc_and_get_section (abfd, s, &dynbuf)) |
| 3310 | goto error_free_dyn; |
| 3311 | |
| 3312 | elfsec = _bfd_elf_section_from_bfd_section (abfd, s); |
| 3313 | if (elfsec == -1) |
| 3314 | goto error_free_dyn; |
| 3315 | shlink = elf_elfsections (abfd)[elfsec]->sh_link; |
| 3316 | |
| 3317 | for (extdyn = dynbuf; |
| 3318 | extdyn < dynbuf + s->size; |
| 3319 | extdyn += bed->s->sizeof_dyn) |
| 3320 | { |
| 3321 | Elf_Internal_Dyn dyn; |
| 3322 | |
| 3323 | bed->s->swap_dyn_in (abfd, extdyn, &dyn); |
| 3324 | if (dyn.d_tag == DT_SONAME) |
| 3325 | { |
| 3326 | unsigned int tagv = dyn.d_un.d_val; |
| 3327 | soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 3328 | if (soname == NULL) |
| 3329 | goto error_free_dyn; |
| 3330 | } |
| 3331 | if (dyn.d_tag == DT_NEEDED) |
| 3332 | { |
| 3333 | struct bfd_link_needed_list *n, **pn; |
| 3334 | char *fnm, *anm; |
| 3335 | unsigned int tagv = dyn.d_un.d_val; |
| 3336 | |
| 3337 | amt = sizeof (struct bfd_link_needed_list); |
| 3338 | n = bfd_alloc (abfd, amt); |
| 3339 | fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 3340 | if (n == NULL || fnm == NULL) |
| 3341 | goto error_free_dyn; |
| 3342 | amt = strlen (fnm) + 1; |
| 3343 | anm = bfd_alloc (abfd, amt); |
| 3344 | if (anm == NULL) |
| 3345 | goto error_free_dyn; |
| 3346 | memcpy (anm, fnm, amt); |
| 3347 | n->name = anm; |
| 3348 | n->by = abfd; |
| 3349 | n->next = NULL; |
| 3350 | for (pn = & hash_table->needed; |
| 3351 | *pn != NULL; |
| 3352 | pn = &(*pn)->next) |
| 3353 | ; |
| 3354 | *pn = n; |
| 3355 | } |
| 3356 | if (dyn.d_tag == DT_RUNPATH) |
| 3357 | { |
| 3358 | struct bfd_link_needed_list *n, **pn; |
| 3359 | char *fnm, *anm; |
| 3360 | unsigned int tagv = dyn.d_un.d_val; |
| 3361 | |
| 3362 | amt = sizeof (struct bfd_link_needed_list); |
| 3363 | n = bfd_alloc (abfd, amt); |
| 3364 | fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 3365 | if (n == NULL || fnm == NULL) |
| 3366 | goto error_free_dyn; |
| 3367 | amt = strlen (fnm) + 1; |
| 3368 | anm = bfd_alloc (abfd, amt); |
| 3369 | if (anm == NULL) |
| 3370 | goto error_free_dyn; |
| 3371 | memcpy (anm, fnm, amt); |
| 3372 | n->name = anm; |
| 3373 | n->by = abfd; |
| 3374 | n->next = NULL; |
| 3375 | for (pn = & runpath; |
| 3376 | *pn != NULL; |
| 3377 | pn = &(*pn)->next) |
| 3378 | ; |
| 3379 | *pn = n; |
| 3380 | } |
| 3381 | /* Ignore DT_RPATH if we have seen DT_RUNPATH. */ |
| 3382 | if (!runpath && dyn.d_tag == DT_RPATH) |
| 3383 | { |
| 3384 | struct bfd_link_needed_list *n, **pn; |
| 3385 | char *fnm, *anm; |
| 3386 | unsigned int tagv = dyn.d_un.d_val; |
| 3387 | |
| 3388 | amt = sizeof (struct bfd_link_needed_list); |
| 3389 | n = bfd_alloc (abfd, amt); |
| 3390 | fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 3391 | if (n == NULL || fnm == NULL) |
| 3392 | goto error_free_dyn; |
| 3393 | amt = strlen (fnm) + 1; |
| 3394 | anm = bfd_alloc (abfd, amt); |
| 3395 | if (anm == NULL) |
| 3396 | { |
| 3397 | error_free_dyn: |
| 3398 | free (dynbuf); |
| 3399 | goto error_return; |
| 3400 | } |
| 3401 | memcpy (anm, fnm, amt); |
| 3402 | n->name = anm; |
| 3403 | n->by = abfd; |
| 3404 | n->next = NULL; |
| 3405 | for (pn = & rpath; |
| 3406 | *pn != NULL; |
| 3407 | pn = &(*pn)->next) |
| 3408 | ; |
| 3409 | *pn = n; |
| 3410 | } |
| 3411 | } |
| 3412 | |
| 3413 | free (dynbuf); |
| 3414 | } |
| 3415 | |
| 3416 | /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that |
| 3417 | frees all more recently bfd_alloc'd blocks as well. */ |
| 3418 | if (runpath) |
| 3419 | rpath = runpath; |
| 3420 | |
| 3421 | if (rpath) |
| 3422 | { |
| 3423 | struct bfd_link_needed_list **pn; |
| 3424 | for (pn = & hash_table->runpath; |
| 3425 | *pn != NULL; |
| 3426 | pn = &(*pn)->next) |
| 3427 | ; |
| 3428 | *pn = rpath; |
| 3429 | } |
| 3430 | |
| 3431 | /* We do not want to include any of the sections in a dynamic |
| 3432 | object in the output file. We hack by simply clobbering the |
| 3433 | list of sections in the BFD. This could be handled more |
| 3434 | cleanly by, say, a new section flag; the existing |
| 3435 | SEC_NEVER_LOAD flag is not the one we want, because that one |
| 3436 | still implies that the section takes up space in the output |
| 3437 | file. */ |
| 3438 | bfd_section_list_clear (abfd); |
| 3439 | |
| 3440 | /* Find the name to use in a DT_NEEDED entry that refers to this |
| 3441 | object. If the object has a DT_SONAME entry, we use it. |
| 3442 | Otherwise, if the generic linker stuck something in |
| 3443 | elf_dt_name, we use that. Otherwise, we just use the file |
| 3444 | name. */ |
| 3445 | if (soname == NULL || *soname == '\0') |
| 3446 | { |
| 3447 | soname = elf_dt_name (abfd); |
| 3448 | if (soname == NULL || *soname == '\0') |
| 3449 | soname = bfd_get_filename (abfd); |
| 3450 | } |
| 3451 | |
| 3452 | /* Save the SONAME because sometimes the linker emulation code |
| 3453 | will need to know it. */ |
| 3454 | elf_dt_name (abfd) = soname; |
| 3455 | |
| 3456 | ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed); |
| 3457 | if (ret < 0) |
| 3458 | goto error_return; |
| 3459 | |
| 3460 | /* If we have already included this dynamic object in the |
| 3461 | link, just ignore it. There is no reason to include a |
| 3462 | particular dynamic object more than once. */ |
| 3463 | if (ret > 0) |
| 3464 | return TRUE; |
| 3465 | } |
| 3466 | |
| 3467 | /* If this is a dynamic object, we always link against the .dynsym |
| 3468 | symbol table, not the .symtab symbol table. The dynamic linker |
| 3469 | will only see the .dynsym symbol table, so there is no reason to |
| 3470 | look at .symtab for a dynamic object. */ |
| 3471 | |
| 3472 | if (! dynamic || elf_dynsymtab (abfd) == 0) |
| 3473 | hdr = &elf_tdata (abfd)->symtab_hdr; |
| 3474 | else |
| 3475 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; |
| 3476 | |
| 3477 | symcount = hdr->sh_size / bed->s->sizeof_sym; |
| 3478 | |
| 3479 | /* The sh_info field of the symtab header tells us where the |
| 3480 | external symbols start. We don't care about the local symbols at |
| 3481 | this point. */ |
| 3482 | if (elf_bad_symtab (abfd)) |
| 3483 | { |
| 3484 | extsymcount = symcount; |
| 3485 | extsymoff = 0; |
| 3486 | } |
| 3487 | else |
| 3488 | { |
| 3489 | extsymcount = symcount - hdr->sh_info; |
| 3490 | extsymoff = hdr->sh_info; |
| 3491 | } |
| 3492 | |
| 3493 | sym_hash = NULL; |
| 3494 | if (extsymcount != 0) |
| 3495 | { |
| 3496 | isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff, |
| 3497 | NULL, NULL, NULL); |
| 3498 | if (isymbuf == NULL) |
| 3499 | goto error_return; |
| 3500 | |
| 3501 | /* We store a pointer to the hash table entry for each external |
| 3502 | symbol. */ |
| 3503 | amt = extsymcount * sizeof (struct elf_link_hash_entry *); |
| 3504 | sym_hash = bfd_alloc (abfd, amt); |
| 3505 | if (sym_hash == NULL) |
| 3506 | goto error_free_sym; |
| 3507 | elf_sym_hashes (abfd) = sym_hash; |
| 3508 | } |
| 3509 | |
| 3510 | if (dynamic) |
| 3511 | { |
| 3512 | /* Read in any version definitions. */ |
| 3513 | if (!_bfd_elf_slurp_version_tables (abfd, |
| 3514 | info->default_imported_symver)) |
| 3515 | goto error_free_sym; |
| 3516 | |
| 3517 | /* Read in the symbol versions, but don't bother to convert them |
| 3518 | to internal format. */ |
| 3519 | if (elf_dynversym (abfd) != 0) |
| 3520 | { |
| 3521 | Elf_Internal_Shdr *versymhdr; |
| 3522 | |
| 3523 | versymhdr = &elf_tdata (abfd)->dynversym_hdr; |
| 3524 | extversym = bfd_malloc (versymhdr->sh_size); |
| 3525 | if (extversym == NULL) |
| 3526 | goto error_free_sym; |
| 3527 | amt = versymhdr->sh_size; |
| 3528 | if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0 |
| 3529 | || bfd_bread (extversym, amt, abfd) != amt) |
| 3530 | goto error_free_vers; |
| 3531 | } |
| 3532 | } |
| 3533 | |
| 3534 | weaks = NULL; |
| 3535 | |
| 3536 | ever = extversym != NULL ? extversym + extsymoff : NULL; |
| 3537 | for (isym = isymbuf, isymend = isymbuf + extsymcount; |
| 3538 | isym < isymend; |
| 3539 | isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL)) |
| 3540 | { |
| 3541 | int bind; |
| 3542 | bfd_vma value; |
| 3543 | asection *sec, *new_sec; |
| 3544 | flagword flags; |
| 3545 | const char *name; |
| 3546 | struct elf_link_hash_entry *h; |
| 3547 | bfd_boolean definition; |
| 3548 | bfd_boolean size_change_ok; |
| 3549 | bfd_boolean type_change_ok; |
| 3550 | bfd_boolean new_weakdef; |
| 3551 | bfd_boolean override; |
| 3552 | unsigned int old_alignment; |
| 3553 | bfd *old_bfd; |
| 3554 | |
| 3555 | override = FALSE; |
| 3556 | |
| 3557 | flags = BSF_NO_FLAGS; |
| 3558 | sec = NULL; |
| 3559 | value = isym->st_value; |
| 3560 | *sym_hash = NULL; |
| 3561 | |
| 3562 | bind = ELF_ST_BIND (isym->st_info); |
| 3563 | if (bind == STB_LOCAL) |
| 3564 | { |
| 3565 | /* This should be impossible, since ELF requires that all |
| 3566 | global symbols follow all local symbols, and that sh_info |
| 3567 | point to the first global symbol. Unfortunately, Irix 5 |
| 3568 | screws this up. */ |
| 3569 | continue; |
| 3570 | } |
| 3571 | else if (bind == STB_GLOBAL) |
| 3572 | { |
| 3573 | if (isym->st_shndx != SHN_UNDEF |
| 3574 | && isym->st_shndx != SHN_COMMON) |
| 3575 | flags = BSF_GLOBAL; |
| 3576 | } |
| 3577 | else if (bind == STB_WEAK) |
| 3578 | flags = BSF_WEAK; |
| 3579 | else |
| 3580 | { |
| 3581 | /* Leave it up to the processor backend. */ |
| 3582 | } |
| 3583 | |
| 3584 | if (isym->st_shndx == SHN_UNDEF) |
| 3585 | sec = bfd_und_section_ptr; |
| 3586 | else if (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE) |
| 3587 | { |
| 3588 | sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 3589 | if (sec == NULL) |
| 3590 | sec = bfd_abs_section_ptr; |
| 3591 | else if (sec->kept_section) |
| 3592 | { |
| 3593 | /* Symbols from discarded section are undefined, and have |
| 3594 | default visibility. */ |
| 3595 | sec = bfd_und_section_ptr; |
| 3596 | isym->st_shndx = SHN_UNDEF; |
| 3597 | isym->st_other = STV_DEFAULT |
| 3598 | | (isym->st_other & ~ ELF_ST_VISIBILITY(-1)); |
| 3599 | } |
| 3600 | else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) |
| 3601 | value -= sec->vma; |
| 3602 | } |
| 3603 | else if (isym->st_shndx == SHN_ABS) |
| 3604 | sec = bfd_abs_section_ptr; |
| 3605 | else if (isym->st_shndx == SHN_COMMON) |
| 3606 | { |
| 3607 | sec = bfd_com_section_ptr; |
| 3608 | /* What ELF calls the size we call the value. What ELF |
| 3609 | calls the value we call the alignment. */ |
| 3610 | value = isym->st_size; |
| 3611 | } |
| 3612 | else |
| 3613 | { |
| 3614 | /* Leave it up to the processor backend. */ |
| 3615 | } |
| 3616 | |
| 3617 | name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, |
| 3618 | isym->st_name); |
| 3619 | if (name == NULL) |
| 3620 | goto error_free_vers; |
| 3621 | |
| 3622 | if (isym->st_shndx == SHN_COMMON |
| 3623 | && ELF_ST_TYPE (isym->st_info) == STT_TLS) |
| 3624 | { |
| 3625 | asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon"); |
| 3626 | |
| 3627 | if (tcomm == NULL) |
| 3628 | { |
| 3629 | tcomm = bfd_make_section_with_flags (abfd, ".tcommon", |
| 3630 | (SEC_ALLOC |
| 3631 | | SEC_IS_COMMON |
| 3632 | | SEC_LINKER_CREATED |
| 3633 | | SEC_THREAD_LOCAL)); |
| 3634 | if (tcomm == NULL) |
| 3635 | goto error_free_vers; |
| 3636 | } |
| 3637 | sec = tcomm; |
| 3638 | } |
| 3639 | else if (add_symbol_hook) |
| 3640 | { |
| 3641 | if (! (*add_symbol_hook) (abfd, info, isym, &name, &flags, &sec, |
| 3642 | &value)) |
| 3643 | goto error_free_vers; |
| 3644 | |
| 3645 | /* The hook function sets the name to NULL if this symbol |
| 3646 | should be skipped for some reason. */ |
| 3647 | if (name == NULL) |
| 3648 | continue; |
| 3649 | } |
| 3650 | |
| 3651 | /* Sanity check that all possibilities were handled. */ |
| 3652 | if (sec == NULL) |
| 3653 | { |
| 3654 | bfd_set_error (bfd_error_bad_value); |
| 3655 | goto error_free_vers; |
| 3656 | } |
| 3657 | |
| 3658 | if (bfd_is_und_section (sec) |
| 3659 | || bfd_is_com_section (sec)) |
| 3660 | definition = FALSE; |
| 3661 | else |
| 3662 | definition = TRUE; |
| 3663 | |
| 3664 | size_change_ok = FALSE; |
| 3665 | type_change_ok = get_elf_backend_data (abfd)->type_change_ok; |
| 3666 | old_alignment = 0; |
| 3667 | old_bfd = NULL; |
| 3668 | new_sec = sec; |
| 3669 | |
| 3670 | if (is_elf_hash_table (hash_table)) |
| 3671 | { |
| 3672 | Elf_Internal_Versym iver; |
| 3673 | unsigned int vernum = 0; |
| 3674 | bfd_boolean skip; |
| 3675 | |
| 3676 | if (ever == NULL) |
| 3677 | { |
| 3678 | if (info->default_imported_symver) |
| 3679 | /* Use the default symbol version created earlier. */ |
| 3680 | iver.vs_vers = elf_tdata (abfd)->cverdefs; |
| 3681 | else |
| 3682 | iver.vs_vers = 0; |
| 3683 | } |
| 3684 | else |
| 3685 | _bfd_elf_swap_versym_in (abfd, ever, &iver); |
| 3686 | |
| 3687 | vernum = iver.vs_vers & VERSYM_VERSION; |
| 3688 | |
| 3689 | /* If this is a hidden symbol, or if it is not version |
| 3690 | 1, we append the version name to the symbol name. |
| 3691 | However, we do not modify a non-hidden absolute |
| 3692 | symbol, because it might be the version symbol |
| 3693 | itself. FIXME: What if it isn't? */ |
| 3694 | if ((iver.vs_vers & VERSYM_HIDDEN) != 0 |
| 3695 | || (vernum > 1 && ! bfd_is_abs_section (sec))) |
| 3696 | { |
| 3697 | const char *verstr; |
| 3698 | size_t namelen, verlen, newlen; |
| 3699 | char *newname, *p; |
| 3700 | |
| 3701 | if (isym->st_shndx != SHN_UNDEF) |
| 3702 | { |
| 3703 | if (vernum > elf_tdata (abfd)->cverdefs) |
| 3704 | verstr = NULL; |
| 3705 | else if (vernum > 1) |
| 3706 | verstr = |
| 3707 | elf_tdata (abfd)->verdef[vernum - 1].vd_nodename; |
| 3708 | else |
| 3709 | verstr = ""; |
| 3710 | |
| 3711 | if (verstr == NULL) |
| 3712 | { |
| 3713 | (*_bfd_error_handler) |
| 3714 | (_("%B: %s: invalid version %u (max %d)"), |
| 3715 | abfd, name, vernum, |
| 3716 | elf_tdata (abfd)->cverdefs); |
| 3717 | bfd_set_error (bfd_error_bad_value); |
| 3718 | goto error_free_vers; |
| 3719 | } |
| 3720 | } |
| 3721 | else |
| 3722 | { |
| 3723 | /* We cannot simply test for the number of |
| 3724 | entries in the VERNEED section since the |
| 3725 | numbers for the needed versions do not start |
| 3726 | at 0. */ |
| 3727 | Elf_Internal_Verneed *t; |
| 3728 | |
| 3729 | verstr = NULL; |
| 3730 | for (t = elf_tdata (abfd)->verref; |
| 3731 | t != NULL; |
| 3732 | t = t->vn_nextref) |
| 3733 | { |
| 3734 | Elf_Internal_Vernaux *a; |
| 3735 | |
| 3736 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 3737 | { |
| 3738 | if (a->vna_other == vernum) |
| 3739 | { |
| 3740 | verstr = a->vna_nodename; |
| 3741 | break; |
| 3742 | } |
| 3743 | } |
| 3744 | if (a != NULL) |
| 3745 | break; |
| 3746 | } |
| 3747 | if (verstr == NULL) |
| 3748 | { |
| 3749 | (*_bfd_error_handler) |
| 3750 | (_("%B: %s: invalid needed version %d"), |
| 3751 | abfd, name, vernum); |
| 3752 | bfd_set_error (bfd_error_bad_value); |
| 3753 | goto error_free_vers; |
| 3754 | } |
| 3755 | } |
| 3756 | |
| 3757 | namelen = strlen (name); |
| 3758 | verlen = strlen (verstr); |
| 3759 | newlen = namelen + verlen + 2; |
| 3760 | if ((iver.vs_vers & VERSYM_HIDDEN) == 0 |
| 3761 | && isym->st_shndx != SHN_UNDEF) |
| 3762 | ++newlen; |
| 3763 | |
| 3764 | newname = bfd_alloc (abfd, newlen); |
| 3765 | if (newname == NULL) |
| 3766 | goto error_free_vers; |
| 3767 | memcpy (newname, name, namelen); |
| 3768 | p = newname + namelen; |
| 3769 | *p++ = ELF_VER_CHR; |
| 3770 | /* If this is a defined non-hidden version symbol, |
| 3771 | we add another @ to the name. This indicates the |
| 3772 | default version of the symbol. */ |
| 3773 | if ((iver.vs_vers & VERSYM_HIDDEN) == 0 |
| 3774 | && isym->st_shndx != SHN_UNDEF) |
| 3775 | *p++ = ELF_VER_CHR; |
| 3776 | memcpy (p, verstr, verlen + 1); |
| 3777 | |
| 3778 | name = newname; |
| 3779 | } |
| 3780 | |
| 3781 | if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, |
| 3782 | &value, &old_alignment, |
| 3783 | sym_hash, &skip, &override, |
| 3784 | &type_change_ok, &size_change_ok)) |
| 3785 | goto error_free_vers; |
| 3786 | |
| 3787 | if (skip) |
| 3788 | continue; |
| 3789 | |
| 3790 | if (override) |
| 3791 | definition = FALSE; |
| 3792 | |
| 3793 | h = *sym_hash; |
| 3794 | while (h->root.type == bfd_link_hash_indirect |
| 3795 | || h->root.type == bfd_link_hash_warning) |
| 3796 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 3797 | |
| 3798 | /* Remember the old alignment if this is a common symbol, so |
| 3799 | that we don't reduce the alignment later on. We can't |
| 3800 | check later, because _bfd_generic_link_add_one_symbol |
| 3801 | will set a default for the alignment which we want to |
| 3802 | override. We also remember the old bfd where the existing |
| 3803 | definition comes from. */ |
| 3804 | switch (h->root.type) |
| 3805 | { |
| 3806 | default: |
| 3807 | break; |
| 3808 | |
| 3809 | case bfd_link_hash_defined: |
| 3810 | case bfd_link_hash_defweak: |
| 3811 | old_bfd = h->root.u.def.section->owner; |
| 3812 | break; |
| 3813 | |
| 3814 | case bfd_link_hash_common: |
| 3815 | old_bfd = h->root.u.c.p->section->owner; |
| 3816 | old_alignment = h->root.u.c.p->alignment_power; |
| 3817 | break; |
| 3818 | } |
| 3819 | |
| 3820 | if (elf_tdata (abfd)->verdef != NULL |
| 3821 | && ! override |
| 3822 | && vernum > 1 |
| 3823 | && definition) |
| 3824 | h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1]; |
| 3825 | } |
| 3826 | |
| 3827 | if (! (_bfd_generic_link_add_one_symbol |
| 3828 | (info, abfd, name, flags, sec, value, NULL, FALSE, collect, |
| 3829 | (struct bfd_link_hash_entry **) sym_hash))) |
| 3830 | goto error_free_vers; |
| 3831 | |
| 3832 | h = *sym_hash; |
| 3833 | while (h->root.type == bfd_link_hash_indirect |
| 3834 | || h->root.type == bfd_link_hash_warning) |
| 3835 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 3836 | *sym_hash = h; |
| 3837 | |
| 3838 | new_weakdef = FALSE; |
| 3839 | if (dynamic |
| 3840 | && definition |
| 3841 | && (flags & BSF_WEAK) != 0 |
| 3842 | && ELF_ST_TYPE (isym->st_info) != STT_FUNC |
| 3843 | && is_elf_hash_table (hash_table) |
| 3844 | && h->u.weakdef == NULL) |
| 3845 | { |
| 3846 | /* Keep a list of all weak defined non function symbols from |
| 3847 | a dynamic object, using the weakdef field. Later in this |
| 3848 | function we will set the weakdef field to the correct |
| 3849 | value. We only put non-function symbols from dynamic |
| 3850 | objects on this list, because that happens to be the only |
| 3851 | time we need to know the normal symbol corresponding to a |
| 3852 | weak symbol, and the information is time consuming to |
| 3853 | figure out. If the weakdef field is not already NULL, |
| 3854 | then this symbol was already defined by some previous |
| 3855 | dynamic object, and we will be using that previous |
| 3856 | definition anyhow. */ |
| 3857 | |
| 3858 | h->u.weakdef = weaks; |
| 3859 | weaks = h; |
| 3860 | new_weakdef = TRUE; |
| 3861 | } |
| 3862 | |
| 3863 | /* Set the alignment of a common symbol. */ |
| 3864 | if ((isym->st_shndx == SHN_COMMON |
| 3865 | || bfd_is_com_section (sec)) |
| 3866 | && h->root.type == bfd_link_hash_common) |
| 3867 | { |
| 3868 | unsigned int align; |
| 3869 | |
| 3870 | if (isym->st_shndx == SHN_COMMON) |
| 3871 | align = bfd_log2 (isym->st_value); |
| 3872 | else |
| 3873 | { |
| 3874 | /* The new symbol is a common symbol in a shared object. |
| 3875 | We need to get the alignment from the section. */ |
| 3876 | align = new_sec->alignment_power; |
| 3877 | } |
| 3878 | if (align > old_alignment |
| 3879 | /* Permit an alignment power of zero if an alignment of one |
| 3880 | is specified and no other alignments have been specified. */ |
| 3881 | || (isym->st_value == 1 && old_alignment == 0)) |
| 3882 | h->root.u.c.p->alignment_power = align; |
| 3883 | else |
| 3884 | h->root.u.c.p->alignment_power = old_alignment; |
| 3885 | } |
| 3886 | |
| 3887 | if (is_elf_hash_table (hash_table)) |
| 3888 | { |
| 3889 | bfd_boolean dynsym; |
| 3890 | |
| 3891 | /* Check the alignment when a common symbol is involved. This |
| 3892 | can change when a common symbol is overridden by a normal |
| 3893 | definition or a common symbol is ignored due to the old |
| 3894 | normal definition. We need to make sure the maximum |
| 3895 | alignment is maintained. */ |
| 3896 | if ((old_alignment || isym->st_shndx == SHN_COMMON) |
| 3897 | && h->root.type != bfd_link_hash_common) |
| 3898 | { |
| 3899 | unsigned int common_align; |
| 3900 | unsigned int normal_align; |
| 3901 | unsigned int symbol_align; |
| 3902 | bfd *normal_bfd; |
| 3903 | bfd *common_bfd; |
| 3904 | |
| 3905 | symbol_align = ffs (h->root.u.def.value) - 1; |
| 3906 | if (h->root.u.def.section->owner != NULL |
| 3907 | && (h->root.u.def.section->owner->flags & DYNAMIC) == 0) |
| 3908 | { |
| 3909 | normal_align = h->root.u.def.section->alignment_power; |
| 3910 | if (normal_align > symbol_align) |
| 3911 | normal_align = symbol_align; |
| 3912 | } |
| 3913 | else |
| 3914 | normal_align = symbol_align; |
| 3915 | |
| 3916 | if (old_alignment) |
| 3917 | { |
| 3918 | common_align = old_alignment; |
| 3919 | common_bfd = old_bfd; |
| 3920 | normal_bfd = abfd; |
| 3921 | } |
| 3922 | else |
| 3923 | { |
| 3924 | common_align = bfd_log2 (isym->st_value); |
| 3925 | common_bfd = abfd; |
| 3926 | normal_bfd = old_bfd; |
| 3927 | } |
| 3928 | |
| 3929 | if (normal_align < common_align) |
| 3930 | (*_bfd_error_handler) |
| 3931 | (_("Warning: alignment %u of symbol `%s' in %B" |
| 3932 | " is smaller than %u in %B"), |
| 3933 | normal_bfd, common_bfd, |
| 3934 | 1 << normal_align, name, 1 << common_align); |
| 3935 | } |
| 3936 | |
| 3937 | /* Remember the symbol size and type. */ |
| 3938 | if (isym->st_size != 0 |
| 3939 | && (definition || h->size == 0)) |
| 3940 | { |
| 3941 | if (h->size != 0 && h->size != isym->st_size && ! size_change_ok) |
| 3942 | (*_bfd_error_handler) |
| 3943 | (_("Warning: size of symbol `%s' changed" |
| 3944 | " from %lu in %B to %lu in %B"), |
| 3945 | old_bfd, abfd, |
| 3946 | name, (unsigned long) h->size, |
| 3947 | (unsigned long) isym->st_size); |
| 3948 | |
| 3949 | h->size = isym->st_size; |
| 3950 | } |
| 3951 | |
| 3952 | /* If this is a common symbol, then we always want H->SIZE |
| 3953 | to be the size of the common symbol. The code just above |
| 3954 | won't fix the size if a common symbol becomes larger. We |
| 3955 | don't warn about a size change here, because that is |
| 3956 | covered by --warn-common. */ |
| 3957 | if (h->root.type == bfd_link_hash_common) |
| 3958 | h->size = h->root.u.c.size; |
| 3959 | |
| 3960 | if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE |
| 3961 | && (definition || h->type == STT_NOTYPE)) |
| 3962 | { |
| 3963 | if (h->type != STT_NOTYPE |
| 3964 | && h->type != ELF_ST_TYPE (isym->st_info) |
| 3965 | && ! type_change_ok) |
| 3966 | (*_bfd_error_handler) |
| 3967 | (_("Warning: type of symbol `%s' changed" |
| 3968 | " from %d to %d in %B"), |
| 3969 | abfd, name, h->type, ELF_ST_TYPE (isym->st_info)); |
| 3970 | |
| 3971 | h->type = ELF_ST_TYPE (isym->st_info); |
| 3972 | } |
| 3973 | |
| 3974 | /* If st_other has a processor-specific meaning, specific |
| 3975 | code might be needed here. We never merge the visibility |
| 3976 | attribute with the one from a dynamic object. */ |
| 3977 | if (bed->elf_backend_merge_symbol_attribute) |
| 3978 | (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition, |
| 3979 | dynamic); |
| 3980 | |
| 3981 | /* If this symbol has default visibility and the user has requested |
| 3982 | we not re-export it, then mark it as hidden. */ |
| 3983 | if (definition && !dynamic |
| 3984 | && (abfd->no_export |
| 3985 | || (abfd->my_archive && abfd->my_archive->no_export)) |
| 3986 | && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL) |
| 3987 | isym->st_other = STV_HIDDEN | (isym->st_other & ~ ELF_ST_VISIBILITY (-1)); |
| 3988 | |
| 3989 | if (isym->st_other != 0 && !dynamic) |
| 3990 | { |
| 3991 | unsigned char hvis, symvis, other, nvis; |
| 3992 | |
| 3993 | /* Take the balance of OTHER from the definition. */ |
| 3994 | other = (definition ? isym->st_other : h->other); |
| 3995 | other &= ~ ELF_ST_VISIBILITY (-1); |
| 3996 | |
| 3997 | /* Combine visibilities, using the most constraining one. */ |
| 3998 | hvis = ELF_ST_VISIBILITY (h->other); |
| 3999 | symvis = ELF_ST_VISIBILITY (isym->st_other); |
| 4000 | if (! hvis) |
| 4001 | nvis = symvis; |
| 4002 | else if (! symvis) |
| 4003 | nvis = hvis; |
| 4004 | else |
| 4005 | nvis = hvis < symvis ? hvis : symvis; |
| 4006 | |
| 4007 | h->other = other | nvis; |
| 4008 | } |
| 4009 | |
| 4010 | /* Set a flag in the hash table entry indicating the type of |
| 4011 | reference or definition we just found. Keep a count of |
| 4012 | the number of dynamic symbols we find. A dynamic symbol |
| 4013 | is one which is referenced or defined by both a regular |
| 4014 | object and a shared object. */ |
| 4015 | dynsym = FALSE; |
| 4016 | if (! dynamic) |
| 4017 | { |
| 4018 | if (! definition) |
| 4019 | { |
| 4020 | h->ref_regular = 1; |
| 4021 | if (bind != STB_WEAK) |
| 4022 | h->ref_regular_nonweak = 1; |
| 4023 | } |
| 4024 | else |
| 4025 | h->def_regular = 1; |
| 4026 | if (! info->executable |
| 4027 | || h->def_dynamic |
| 4028 | || h->ref_dynamic) |
| 4029 | dynsym = TRUE; |
| 4030 | } |
| 4031 | else |
| 4032 | { |
| 4033 | if (! definition) |
| 4034 | h->ref_dynamic = 1; |
| 4035 | else |
| 4036 | h->def_dynamic = 1; |
| 4037 | if (h->def_regular |
| 4038 | || h->ref_regular |
| 4039 | || (h->u.weakdef != NULL |
| 4040 | && ! new_weakdef |
| 4041 | && h->u.weakdef->dynindx != -1)) |
| 4042 | dynsym = TRUE; |
| 4043 | } |
| 4044 | |
| 4045 | /* Check to see if we need to add an indirect symbol for |
| 4046 | the default name. */ |
| 4047 | if (definition || h->root.type == bfd_link_hash_common) |
| 4048 | if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym, |
| 4049 | &sec, &value, &dynsym, |
| 4050 | override)) |
| 4051 | goto error_free_vers; |
| 4052 | |
| 4053 | if (definition && !dynamic) |
| 4054 | { |
| 4055 | char *p = strchr (name, ELF_VER_CHR); |
| 4056 | if (p != NULL && p[1] != ELF_VER_CHR) |
| 4057 | { |
| 4058 | /* Queue non-default versions so that .symver x, x@FOO |
| 4059 | aliases can be checked. */ |
| 4060 | if (! nondeflt_vers) |
| 4061 | { |
| 4062 | amt = (isymend - isym + 1) |
| 4063 | * sizeof (struct elf_link_hash_entry *); |
| 4064 | nondeflt_vers = bfd_malloc (amt); |
| 4065 | } |
| 4066 | nondeflt_vers [nondeflt_vers_cnt++] = h; |
| 4067 | } |
| 4068 | } |
| 4069 | |
| 4070 | if (dynsym && h->dynindx == -1) |
| 4071 | { |
| 4072 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 4073 | goto error_free_vers; |
| 4074 | if (h->u.weakdef != NULL |
| 4075 | && ! new_weakdef |
| 4076 | && h->u.weakdef->dynindx == -1) |
| 4077 | { |
| 4078 | if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef)) |
| 4079 | goto error_free_vers; |
| 4080 | } |
| 4081 | } |
| 4082 | else if (dynsym && h->dynindx != -1) |
| 4083 | /* If the symbol already has a dynamic index, but |
| 4084 | visibility says it should not be visible, turn it into |
| 4085 | a local symbol. */ |
| 4086 | switch (ELF_ST_VISIBILITY (h->other)) |
| 4087 | { |
| 4088 | case STV_INTERNAL: |
| 4089 | case STV_HIDDEN: |
| 4090 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 4091 | dynsym = FALSE; |
| 4092 | break; |
| 4093 | } |
| 4094 | |
| 4095 | if (!add_needed |
| 4096 | && definition |
| 4097 | && dynsym |
| 4098 | && h->ref_regular) |
| 4099 | { |
| 4100 | int ret; |
| 4101 | const char *soname = elf_dt_name (abfd); |
| 4102 | |
| 4103 | /* A symbol from a library loaded via DT_NEEDED of some |
| 4104 | other library is referenced by a regular object. |
| 4105 | Add a DT_NEEDED entry for it. Issue an error if |
| 4106 | --no-add-needed is used. */ |
| 4107 | if ((elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0) |
| 4108 | { |
| 4109 | (*_bfd_error_handler) |
| 4110 | (_("%s: invalid DSO for symbol `%s' definition"), |
| 4111 | abfd, name); |
| 4112 | bfd_set_error (bfd_error_bad_value); |
| 4113 | goto error_free_vers; |
| 4114 | } |
| 4115 | |
| 4116 | elf_dyn_lib_class (abfd) &= ~DYN_AS_NEEDED; |
| 4117 | |
| 4118 | add_needed = TRUE; |
| 4119 | ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed); |
| 4120 | if (ret < 0) |
| 4121 | goto error_free_vers; |
| 4122 | |
| 4123 | BFD_ASSERT (ret == 0); |
| 4124 | } |
| 4125 | } |
| 4126 | } |
| 4127 | |
| 4128 | /* Now that all the symbols from this input file are created, handle |
| 4129 | .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */ |
| 4130 | if (nondeflt_vers != NULL) |
| 4131 | { |
| 4132 | bfd_size_type cnt, symidx; |
| 4133 | |
| 4134 | for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt) |
| 4135 | { |
| 4136 | struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi; |
| 4137 | char *shortname, *p; |
| 4138 | |
| 4139 | p = strchr (h->root.root.string, ELF_VER_CHR); |
| 4140 | if (p == NULL |
| 4141 | || (h->root.type != bfd_link_hash_defined |
| 4142 | && h->root.type != bfd_link_hash_defweak)) |
| 4143 | continue; |
| 4144 | |
| 4145 | amt = p - h->root.root.string; |
| 4146 | shortname = bfd_malloc (amt + 1); |
| 4147 | memcpy (shortname, h->root.root.string, amt); |
| 4148 | shortname[amt] = '\0'; |
| 4149 | |
| 4150 | hi = (struct elf_link_hash_entry *) |
| 4151 | bfd_link_hash_lookup (&hash_table->root, shortname, |
| 4152 | FALSE, FALSE, FALSE); |
| 4153 | if (hi != NULL |
| 4154 | && hi->root.type == h->root.type |
| 4155 | && hi->root.u.def.value == h->root.u.def.value |
| 4156 | && hi->root.u.def.section == h->root.u.def.section) |
| 4157 | { |
| 4158 | (*bed->elf_backend_hide_symbol) (info, hi, TRUE); |
| 4159 | hi->root.type = bfd_link_hash_indirect; |
| 4160 | hi->root.u.i.link = (struct bfd_link_hash_entry *) h; |
| 4161 | (*bed->elf_backend_copy_indirect_symbol) (bed, h, hi); |
| 4162 | sym_hash = elf_sym_hashes (abfd); |
| 4163 | if (sym_hash) |
| 4164 | for (symidx = 0; symidx < extsymcount; ++symidx) |
| 4165 | if (sym_hash[symidx] == hi) |
| 4166 | { |
| 4167 | sym_hash[symidx] = h; |
| 4168 | break; |
| 4169 | } |
| 4170 | } |
| 4171 | free (shortname); |
| 4172 | } |
| 4173 | free (nondeflt_vers); |
| 4174 | nondeflt_vers = NULL; |
| 4175 | } |
| 4176 | |
| 4177 | if (extversym != NULL) |
| 4178 | { |
| 4179 | free (extversym); |
| 4180 | extversym = NULL; |
| 4181 | } |
| 4182 | |
| 4183 | if (isymbuf != NULL) |
| 4184 | free (isymbuf); |
| 4185 | isymbuf = NULL; |
| 4186 | |
| 4187 | if (!add_needed |
| 4188 | && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0) |
| 4189 | { |
| 4190 | /* Remove symbols defined in an as-needed shared lib that wasn't |
| 4191 | needed. */ |
| 4192 | struct elf_smash_syms_data inf; |
| 4193 | inf.not_needed = abfd; |
| 4194 | inf.htab = hash_table; |
| 4195 | inf.twiddled = FALSE; |
| 4196 | elf_link_hash_traverse (hash_table, elf_smash_syms, &inf); |
| 4197 | if (inf.twiddled) |
| 4198 | bfd_link_repair_undef_list (&hash_table->root); |
| 4199 | weaks = NULL; |
| 4200 | } |
| 4201 | |
| 4202 | /* Now set the weakdefs field correctly for all the weak defined |
| 4203 | symbols we found. The only way to do this is to search all the |
| 4204 | symbols. Since we only need the information for non functions in |
| 4205 | dynamic objects, that's the only time we actually put anything on |
| 4206 | the list WEAKS. We need this information so that if a regular |
| 4207 | object refers to a symbol defined weakly in a dynamic object, the |
| 4208 | real symbol in the dynamic object is also put in the dynamic |
| 4209 | symbols; we also must arrange for both symbols to point to the |
| 4210 | same memory location. We could handle the general case of symbol |
| 4211 | aliasing, but a general symbol alias can only be generated in |
| 4212 | assembler code, handling it correctly would be very time |
| 4213 | consuming, and other ELF linkers don't handle general aliasing |
| 4214 | either. */ |
| 4215 | if (weaks != NULL) |
| 4216 | { |
| 4217 | struct elf_link_hash_entry **hpp; |
| 4218 | struct elf_link_hash_entry **hppend; |
| 4219 | struct elf_link_hash_entry **sorted_sym_hash; |
| 4220 | struct elf_link_hash_entry *h; |
| 4221 | size_t sym_count; |
| 4222 | |
| 4223 | /* Since we have to search the whole symbol list for each weak |
| 4224 | defined symbol, search time for N weak defined symbols will be |
| 4225 | O(N^2). Binary search will cut it down to O(NlogN). */ |
| 4226 | amt = extsymcount * sizeof (struct elf_link_hash_entry *); |
| 4227 | sorted_sym_hash = bfd_malloc (amt); |
| 4228 | if (sorted_sym_hash == NULL) |
| 4229 | goto error_return; |
| 4230 | sym_hash = sorted_sym_hash; |
| 4231 | hpp = elf_sym_hashes (abfd); |
| 4232 | hppend = hpp + extsymcount; |
| 4233 | sym_count = 0; |
| 4234 | for (; hpp < hppend; hpp++) |
| 4235 | { |
| 4236 | h = *hpp; |
| 4237 | if (h != NULL |
| 4238 | && h->root.type == bfd_link_hash_defined |
| 4239 | && h->type != STT_FUNC) |
| 4240 | { |
| 4241 | *sym_hash = h; |
| 4242 | sym_hash++; |
| 4243 | sym_count++; |
| 4244 | } |
| 4245 | } |
| 4246 | |
| 4247 | qsort (sorted_sym_hash, sym_count, |
| 4248 | sizeof (struct elf_link_hash_entry *), |
| 4249 | elf_sort_symbol); |
| 4250 | |
| 4251 | while (weaks != NULL) |
| 4252 | { |
| 4253 | struct elf_link_hash_entry *hlook; |
| 4254 | asection *slook; |
| 4255 | bfd_vma vlook; |
| 4256 | long ilook; |
| 4257 | size_t i, j, idx; |
| 4258 | |
| 4259 | hlook = weaks; |
| 4260 | weaks = hlook->u.weakdef; |
| 4261 | hlook->u.weakdef = NULL; |
| 4262 | |
| 4263 | BFD_ASSERT (hlook->root.type == bfd_link_hash_defined |
| 4264 | || hlook->root.type == bfd_link_hash_defweak |
| 4265 | || hlook->root.type == bfd_link_hash_common |
| 4266 | || hlook->root.type == bfd_link_hash_indirect); |
| 4267 | slook = hlook->root.u.def.section; |
| 4268 | vlook = hlook->root.u.def.value; |
| 4269 | |
| 4270 | ilook = -1; |
| 4271 | i = 0; |
| 4272 | j = sym_count; |
| 4273 | while (i < j) |
| 4274 | { |
| 4275 | bfd_signed_vma vdiff; |
| 4276 | idx = (i + j) / 2; |
| 4277 | h = sorted_sym_hash [idx]; |
| 4278 | vdiff = vlook - h->root.u.def.value; |
| 4279 | if (vdiff < 0) |
| 4280 | j = idx; |
| 4281 | else if (vdiff > 0) |
| 4282 | i = idx + 1; |
| 4283 | else |
| 4284 | { |
| 4285 | long sdiff = slook->id - h->root.u.def.section->id; |
| 4286 | if (sdiff < 0) |
| 4287 | j = idx; |
| 4288 | else if (sdiff > 0) |
| 4289 | i = idx + 1; |
| 4290 | else |
| 4291 | { |
| 4292 | ilook = idx; |
| 4293 | break; |
| 4294 | } |
| 4295 | } |
| 4296 | } |
| 4297 | |
| 4298 | /* We didn't find a value/section match. */ |
| 4299 | if (ilook == -1) |
| 4300 | continue; |
| 4301 | |
| 4302 | for (i = ilook; i < sym_count; i++) |
| 4303 | { |
| 4304 | h = sorted_sym_hash [i]; |
| 4305 | |
| 4306 | /* Stop if value or section doesn't match. */ |
| 4307 | if (h->root.u.def.value != vlook |
| 4308 | || h->root.u.def.section != slook) |
| 4309 | break; |
| 4310 | else if (h != hlook) |
| 4311 | { |
| 4312 | hlook->u.weakdef = h; |
| 4313 | |
| 4314 | /* If the weak definition is in the list of dynamic |
| 4315 | symbols, make sure the real definition is put |
| 4316 | there as well. */ |
| 4317 | if (hlook->dynindx != -1 && h->dynindx == -1) |
| 4318 | { |
| 4319 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 4320 | goto error_return; |
| 4321 | } |
| 4322 | |
| 4323 | /* If the real definition is in the list of dynamic |
| 4324 | symbols, make sure the weak definition is put |
| 4325 | there as well. If we don't do this, then the |
| 4326 | dynamic loader might not merge the entries for the |
| 4327 | real definition and the weak definition. */ |
| 4328 | if (h->dynindx != -1 && hlook->dynindx == -1) |
| 4329 | { |
| 4330 | if (! bfd_elf_link_record_dynamic_symbol (info, hlook)) |
| 4331 | goto error_return; |
| 4332 | } |
| 4333 | break; |
| 4334 | } |
| 4335 | } |
| 4336 | } |
| 4337 | |
| 4338 | free (sorted_sym_hash); |
| 4339 | } |
| 4340 | |
| 4341 | check_directives = get_elf_backend_data (abfd)->check_directives; |
| 4342 | if (check_directives) |
| 4343 | check_directives (abfd, info); |
| 4344 | |
| 4345 | /* If this object is the same format as the output object, and it is |
| 4346 | not a shared library, then let the backend look through the |
| 4347 | relocs. |
| 4348 | |
| 4349 | This is required to build global offset table entries and to |
| 4350 | arrange for dynamic relocs. It is not required for the |
| 4351 | particular common case of linking non PIC code, even when linking |
| 4352 | against shared libraries, but unfortunately there is no way of |
| 4353 | knowing whether an object file has been compiled PIC or not. |
| 4354 | Looking through the relocs is not particularly time consuming. |
| 4355 | The problem is that we must either (1) keep the relocs in memory, |
| 4356 | which causes the linker to require additional runtime memory or |
| 4357 | (2) read the relocs twice from the input file, which wastes time. |
| 4358 | This would be a good case for using mmap. |
| 4359 | |
| 4360 | I have no idea how to handle linking PIC code into a file of a |
| 4361 | different format. It probably can't be done. */ |
| 4362 | check_relocs = get_elf_backend_data (abfd)->check_relocs; |
| 4363 | if (! dynamic |
| 4364 | && is_elf_hash_table (hash_table) |
| 4365 | && hash_table->root.creator == abfd->xvec |
| 4366 | && check_relocs != NULL) |
| 4367 | { |
| 4368 | asection *o; |
| 4369 | |
| 4370 | for (o = abfd->sections; o != NULL; o = o->next) |
| 4371 | { |
| 4372 | Elf_Internal_Rela *internal_relocs; |
| 4373 | bfd_boolean ok; |
| 4374 | |
| 4375 | if ((o->flags & SEC_RELOC) == 0 |
| 4376 | || o->reloc_count == 0 |
| 4377 | || ((info->strip == strip_all || info->strip == strip_debugger) |
| 4378 | && (o->flags & SEC_DEBUGGING) != 0) |
| 4379 | || bfd_is_abs_section (o->output_section)) |
| 4380 | continue; |
| 4381 | |
| 4382 | internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL, |
| 4383 | info->keep_memory); |
| 4384 | if (internal_relocs == NULL) |
| 4385 | goto error_return; |
| 4386 | |
| 4387 | ok = (*check_relocs) (abfd, info, o, internal_relocs); |
| 4388 | |
| 4389 | if (elf_section_data (o)->relocs != internal_relocs) |
| 4390 | free (internal_relocs); |
| 4391 | |
| 4392 | if (! ok) |
| 4393 | goto error_return; |
| 4394 | } |
| 4395 | } |
| 4396 | |
| 4397 | /* If this is a non-traditional link, try to optimize the handling |
| 4398 | of the .stab/.stabstr sections. */ |
| 4399 | if (! dynamic |
| 4400 | && ! info->traditional_format |
| 4401 | && is_elf_hash_table (hash_table) |
| 4402 | && (info->strip != strip_all && info->strip != strip_debugger)) |
| 4403 | { |
| 4404 | asection *stabstr; |
| 4405 | |
| 4406 | stabstr = bfd_get_section_by_name (abfd, ".stabstr"); |
| 4407 | if (stabstr != NULL) |
| 4408 | { |
| 4409 | bfd_size_type string_offset = 0; |
| 4410 | asection *stab; |
| 4411 | |
| 4412 | for (stab = abfd->sections; stab; stab = stab->next) |
| 4413 | if (strncmp (".stab", stab->name, 5) == 0 |
| 4414 | && (!stab->name[5] || |
| 4415 | (stab->name[5] == '.' && ISDIGIT (stab->name[6]))) |
| 4416 | && (stab->flags & SEC_MERGE) == 0 |
| 4417 | && !bfd_is_abs_section (stab->output_section)) |
| 4418 | { |
| 4419 | struct bfd_elf_section_data *secdata; |
| 4420 | |
| 4421 | secdata = elf_section_data (stab); |
| 4422 | if (! _bfd_link_section_stabs (abfd, |
| 4423 | &hash_table->stab_info, |
| 4424 | stab, stabstr, |
| 4425 | &secdata->sec_info, |
| 4426 | &string_offset)) |
| 4427 | goto error_return; |
| 4428 | if (secdata->sec_info) |
| 4429 | stab->sec_info_type = ELF_INFO_TYPE_STABS; |
| 4430 | } |
| 4431 | } |
| 4432 | } |
| 4433 | |
| 4434 | if (is_elf_hash_table (hash_table) && add_needed) |
| 4435 | { |
| 4436 | /* Add this bfd to the loaded list. */ |
| 4437 | struct elf_link_loaded_list *n; |
| 4438 | |
| 4439 | n = bfd_alloc (abfd, sizeof (struct elf_link_loaded_list)); |
| 4440 | if (n == NULL) |
| 4441 | goto error_return; |
| 4442 | n->abfd = abfd; |
| 4443 | n->next = hash_table->loaded; |
| 4444 | hash_table->loaded = n; |
| 4445 | } |
| 4446 | |
| 4447 | return TRUE; |
| 4448 | |
| 4449 | error_free_vers: |
| 4450 | if (nondeflt_vers != NULL) |
| 4451 | free (nondeflt_vers); |
| 4452 | if (extversym != NULL) |
| 4453 | free (extversym); |
| 4454 | error_free_sym: |
| 4455 | if (isymbuf != NULL) |
| 4456 | free (isymbuf); |
| 4457 | error_return: |
| 4458 | return FALSE; |
| 4459 | } |
| 4460 | |
| 4461 | /* Return the linker hash table entry of a symbol that might be |
| 4462 | satisfied by an archive symbol. Return -1 on error. */ |
| 4463 | |
| 4464 | struct elf_link_hash_entry * |
| 4465 | _bfd_elf_archive_symbol_lookup (bfd *abfd, |
| 4466 | struct bfd_link_info *info, |
| 4467 | const char *name) |
| 4468 | { |
| 4469 | struct elf_link_hash_entry *h; |
| 4470 | char *p, *copy; |
| 4471 | size_t len, first; |
| 4472 | |
| 4473 | h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE); |
| 4474 | if (h != NULL) |
| 4475 | return h; |
| 4476 | |
| 4477 | /* If this is a default version (the name contains @@), look up the |
| 4478 | symbol again with only one `@' as well as without the version. |
| 4479 | The effect is that references to the symbol with and without the |
| 4480 | version will be matched by the default symbol in the archive. */ |
| 4481 | |
| 4482 | p = strchr (name, ELF_VER_CHR); |
| 4483 | if (p == NULL || p[1] != ELF_VER_CHR) |
| 4484 | return h; |
| 4485 | |
| 4486 | /* First check with only one `@'. */ |
| 4487 | len = strlen (name); |
| 4488 | copy = bfd_alloc (abfd, len); |
| 4489 | if (copy == NULL) |
| 4490 | return (struct elf_link_hash_entry *) 0 - 1; |
| 4491 | |
| 4492 | first = p - name + 1; |
| 4493 | memcpy (copy, name, first); |
| 4494 | memcpy (copy + first, name + first + 1, len - first); |
| 4495 | |
| 4496 | h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, FALSE); |
| 4497 | if (h == NULL) |
| 4498 | { |
| 4499 | /* We also need to check references to the symbol without the |
| 4500 | version. */ |
| 4501 | copy[first - 1] = '\0'; |
| 4502 | h = elf_link_hash_lookup (elf_hash_table (info), copy, |
| 4503 | FALSE, FALSE, FALSE); |
| 4504 | } |
| 4505 | |
| 4506 | bfd_release (abfd, copy); |
| 4507 | return h; |
| 4508 | } |
| 4509 | |
| 4510 | /* Add symbols from an ELF archive file to the linker hash table. We |
| 4511 | don't use _bfd_generic_link_add_archive_symbols because of a |
| 4512 | problem which arises on UnixWare. The UnixWare libc.so is an |
| 4513 | archive which includes an entry libc.so.1 which defines a bunch of |
| 4514 | symbols. The libc.so archive also includes a number of other |
| 4515 | object files, which also define symbols, some of which are the same |
| 4516 | as those defined in libc.so.1. Correct linking requires that we |
| 4517 | consider each object file in turn, and include it if it defines any |
| 4518 | symbols we need. _bfd_generic_link_add_archive_symbols does not do |
| 4519 | this; it looks through the list of undefined symbols, and includes |
| 4520 | any object file which defines them. When this algorithm is used on |
| 4521 | UnixWare, it winds up pulling in libc.so.1 early and defining a |
| 4522 | bunch of symbols. This means that some of the other objects in the |
| 4523 | archive are not included in the link, which is incorrect since they |
| 4524 | precede libc.so.1 in the archive. |
| 4525 | |
| 4526 | Fortunately, ELF archive handling is simpler than that done by |
| 4527 | _bfd_generic_link_add_archive_symbols, which has to allow for a.out |
| 4528 | oddities. In ELF, if we find a symbol in the archive map, and the |
| 4529 | symbol is currently undefined, we know that we must pull in that |
| 4530 | object file. |
| 4531 | |
| 4532 | Unfortunately, we do have to make multiple passes over the symbol |
| 4533 | table until nothing further is resolved. */ |
| 4534 | |
| 4535 | static bfd_boolean |
| 4536 | elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info) |
| 4537 | { |
| 4538 | symindex c; |
| 4539 | bfd_boolean *defined = NULL; |
| 4540 | bfd_boolean *included = NULL; |
| 4541 | carsym *symdefs; |
| 4542 | bfd_boolean loop; |
| 4543 | bfd_size_type amt; |
| 4544 | const struct elf_backend_data *bed; |
| 4545 | struct elf_link_hash_entry * (*archive_symbol_lookup) |
| 4546 | (bfd *, struct bfd_link_info *, const char *); |
| 4547 | |
| 4548 | if (! bfd_has_map (abfd)) |
| 4549 | { |
| 4550 | /* An empty archive is a special case. */ |
| 4551 | if (bfd_openr_next_archived_file (abfd, NULL) == NULL) |
| 4552 | return TRUE; |
| 4553 | bfd_set_error (bfd_error_no_armap); |
| 4554 | return FALSE; |
| 4555 | } |
| 4556 | |
| 4557 | /* Keep track of all symbols we know to be already defined, and all |
| 4558 | files we know to be already included. This is to speed up the |
| 4559 | second and subsequent passes. */ |
| 4560 | c = bfd_ardata (abfd)->symdef_count; |
| 4561 | if (c == 0) |
| 4562 | return TRUE; |
| 4563 | amt = c; |
| 4564 | amt *= sizeof (bfd_boolean); |
| 4565 | defined = bfd_zmalloc (amt); |
| 4566 | included = bfd_zmalloc (amt); |
| 4567 | if (defined == NULL || included == NULL) |
| 4568 | goto error_return; |
| 4569 | |
| 4570 | symdefs = bfd_ardata (abfd)->symdefs; |
| 4571 | bed = get_elf_backend_data (abfd); |
| 4572 | archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup; |
| 4573 | |
| 4574 | do |
| 4575 | { |
| 4576 | file_ptr last; |
| 4577 | symindex i; |
| 4578 | carsym *symdef; |
| 4579 | carsym *symdefend; |
| 4580 | |
| 4581 | loop = FALSE; |
| 4582 | last = -1; |
| 4583 | |
| 4584 | symdef = symdefs; |
| 4585 | symdefend = symdef + c; |
| 4586 | for (i = 0; symdef < symdefend; symdef++, i++) |
| 4587 | { |
| 4588 | struct elf_link_hash_entry *h; |
| 4589 | bfd *element; |
| 4590 | struct bfd_link_hash_entry *undefs_tail; |
| 4591 | symindex mark; |
| 4592 | |
| 4593 | if (defined[i] || included[i]) |
| 4594 | continue; |
| 4595 | if (symdef->file_offset == last) |
| 4596 | { |
| 4597 | included[i] = TRUE; |
| 4598 | continue; |
| 4599 | } |
| 4600 | |
| 4601 | h = archive_symbol_lookup (abfd, info, symdef->name); |
| 4602 | if (h == (struct elf_link_hash_entry *) 0 - 1) |
| 4603 | goto error_return; |
| 4604 | |
| 4605 | if (h == NULL) |
| 4606 | continue; |
| 4607 | |
| 4608 | if (h->root.type == bfd_link_hash_common) |
| 4609 | { |
| 4610 | /* We currently have a common symbol. The archive map contains |
| 4611 | a reference to this symbol, so we may want to include it. We |
| 4612 | only want to include it however, if this archive element |
| 4613 | contains a definition of the symbol, not just another common |
| 4614 | declaration of it. |
| 4615 | |
| 4616 | Unfortunately some archivers (including GNU ar) will put |
| 4617 | declarations of common symbols into their archive maps, as |
| 4618 | well as real definitions, so we cannot just go by the archive |
| 4619 | map alone. Instead we must read in the element's symbol |
| 4620 | table and check that to see what kind of symbol definition |
| 4621 | this is. */ |
| 4622 | if (! elf_link_is_defined_archive_symbol (abfd, symdef)) |
| 4623 | continue; |
| 4624 | } |
| 4625 | else if (h->root.type != bfd_link_hash_undefined) |
| 4626 | { |
| 4627 | if (h->root.type != bfd_link_hash_undefweak) |
| 4628 | defined[i] = TRUE; |
| 4629 | continue; |
| 4630 | } |
| 4631 | |
| 4632 | /* We need to include this archive member. */ |
| 4633 | element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset); |
| 4634 | if (element == NULL) |
| 4635 | goto error_return; |
| 4636 | |
| 4637 | if (! bfd_check_format (element, bfd_object)) |
| 4638 | goto error_return; |
| 4639 | |
| 4640 | /* Doublecheck that we have not included this object |
| 4641 | already--it should be impossible, but there may be |
| 4642 | something wrong with the archive. */ |
| 4643 | if (element->archive_pass != 0) |
| 4644 | { |
| 4645 | bfd_set_error (bfd_error_bad_value); |
| 4646 | goto error_return; |
| 4647 | } |
| 4648 | element->archive_pass = 1; |
| 4649 | |
| 4650 | undefs_tail = info->hash->undefs_tail; |
| 4651 | |
| 4652 | if (! (*info->callbacks->add_archive_element) (info, element, |
| 4653 | symdef->name)) |
| 4654 | goto error_return; |
| 4655 | if (! bfd_link_add_symbols (element, info)) |
| 4656 | goto error_return; |
| 4657 | |
| 4658 | /* If there are any new undefined symbols, we need to make |
| 4659 | another pass through the archive in order to see whether |
| 4660 | they can be defined. FIXME: This isn't perfect, because |
| 4661 | common symbols wind up on undefs_tail and because an |
| 4662 | undefined symbol which is defined later on in this pass |
| 4663 | does not require another pass. This isn't a bug, but it |
| 4664 | does make the code less efficient than it could be. */ |
| 4665 | if (undefs_tail != info->hash->undefs_tail) |
| 4666 | loop = TRUE; |
| 4667 | |
| 4668 | /* Look backward to mark all symbols from this object file |
| 4669 | which we have already seen in this pass. */ |
| 4670 | mark = i; |
| 4671 | do |
| 4672 | { |
| 4673 | included[mark] = TRUE; |
| 4674 | if (mark == 0) |
| 4675 | break; |
| 4676 | --mark; |
| 4677 | } |
| 4678 | while (symdefs[mark].file_offset == symdef->file_offset); |
| 4679 | |
| 4680 | /* We mark subsequent symbols from this object file as we go |
| 4681 | on through the loop. */ |
| 4682 | last = symdef->file_offset; |
| 4683 | } |
| 4684 | } |
| 4685 | while (loop); |
| 4686 | |
| 4687 | free (defined); |
| 4688 | free (included); |
| 4689 | |
| 4690 | return TRUE; |
| 4691 | |
| 4692 | error_return: |
| 4693 | if (defined != NULL) |
| 4694 | free (defined); |
| 4695 | if (included != NULL) |
| 4696 | free (included); |
| 4697 | return FALSE; |
| 4698 | } |
| 4699 | |
| 4700 | /* Given an ELF BFD, add symbols to the global hash table as |
| 4701 | appropriate. */ |
| 4702 | |
| 4703 | bfd_boolean |
| 4704 | bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info) |
| 4705 | { |
| 4706 | switch (bfd_get_format (abfd)) |
| 4707 | { |
| 4708 | case bfd_object: |
| 4709 | return elf_link_add_object_symbols (abfd, info); |
| 4710 | case bfd_archive: |
| 4711 | return elf_link_add_archive_symbols (abfd, info); |
| 4712 | default: |
| 4713 | bfd_set_error (bfd_error_wrong_format); |
| 4714 | return FALSE; |
| 4715 | } |
| 4716 | } |
| 4717 | \f |
| 4718 | /* This function will be called though elf_link_hash_traverse to store |
| 4719 | all hash value of the exported symbols in an array. */ |
| 4720 | |
| 4721 | static bfd_boolean |
| 4722 | elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data) |
| 4723 | { |
| 4724 | unsigned long **valuep = data; |
| 4725 | const char *name; |
| 4726 | char *p; |
| 4727 | unsigned long ha; |
| 4728 | char *alc = NULL; |
| 4729 | |
| 4730 | if (h->root.type == bfd_link_hash_warning) |
| 4731 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 4732 | |
| 4733 | /* Ignore indirect symbols. These are added by the versioning code. */ |
| 4734 | if (h->dynindx == -1) |
| 4735 | return TRUE; |
| 4736 | |
| 4737 | name = h->root.root.string; |
| 4738 | p = strchr (name, ELF_VER_CHR); |
| 4739 | if (p != NULL) |
| 4740 | { |
| 4741 | alc = bfd_malloc (p - name + 1); |
| 4742 | memcpy (alc, name, p - name); |
| 4743 | alc[p - name] = '\0'; |
| 4744 | name = alc; |
| 4745 | } |
| 4746 | |
| 4747 | /* Compute the hash value. */ |
| 4748 | ha = bfd_elf_hash (name); |
| 4749 | |
| 4750 | /* Store the found hash value in the array given as the argument. */ |
| 4751 | *(*valuep)++ = ha; |
| 4752 | |
| 4753 | /* And store it in the struct so that we can put it in the hash table |
| 4754 | later. */ |
| 4755 | h->u.elf_hash_value = ha; |
| 4756 | |
| 4757 | if (alc != NULL) |
| 4758 | free (alc); |
| 4759 | |
| 4760 | return TRUE; |
| 4761 | } |
| 4762 | |
| 4763 | /* Array used to determine the number of hash table buckets to use |
| 4764 | based on the number of symbols there are. If there are fewer than |
| 4765 | 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets, |
| 4766 | fewer than 37 we use 17 buckets, and so forth. We never use more |
| 4767 | than 32771 buckets. */ |
| 4768 | |
| 4769 | static const size_t elf_buckets[] = |
| 4770 | { |
| 4771 | 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209, |
| 4772 | 16411, 32771, 0 |
| 4773 | }; |
| 4774 | |
| 4775 | /* Compute bucket count for hashing table. We do not use a static set |
| 4776 | of possible tables sizes anymore. Instead we determine for all |
| 4777 | possible reasonable sizes of the table the outcome (i.e., the |
| 4778 | number of collisions etc) and choose the best solution. The |
| 4779 | weighting functions are not too simple to allow the table to grow |
| 4780 | without bounds. Instead one of the weighting factors is the size. |
| 4781 | Therefore the result is always a good payoff between few collisions |
| 4782 | (= short chain lengths) and table size. */ |
| 4783 | static size_t |
| 4784 | compute_bucket_count (struct bfd_link_info *info) |
| 4785 | { |
| 4786 | size_t dynsymcount = elf_hash_table (info)->dynsymcount; |
| 4787 | size_t best_size = 0; |
| 4788 | unsigned long int *hashcodes; |
| 4789 | unsigned long int *hashcodesp; |
| 4790 | unsigned long int i; |
| 4791 | bfd_size_type amt; |
| 4792 | |
| 4793 | /* Compute the hash values for all exported symbols. At the same |
| 4794 | time store the values in an array so that we could use them for |
| 4795 | optimizations. */ |
| 4796 | amt = dynsymcount; |
| 4797 | amt *= sizeof (unsigned long int); |
| 4798 | hashcodes = bfd_malloc (amt); |
| 4799 | if (hashcodes == NULL) |
| 4800 | return 0; |
| 4801 | hashcodesp = hashcodes; |
| 4802 | |
| 4803 | /* Put all hash values in HASHCODES. */ |
| 4804 | elf_link_hash_traverse (elf_hash_table (info), |
| 4805 | elf_collect_hash_codes, &hashcodesp); |
| 4806 | |
| 4807 | /* We have a problem here. The following code to optimize the table |
| 4808 | size requires an integer type with more the 32 bits. If |
| 4809 | BFD_HOST_U_64_BIT is set we know about such a type. */ |
| 4810 | #ifdef BFD_HOST_U_64_BIT |
| 4811 | if (info->optimize) |
| 4812 | { |
| 4813 | unsigned long int nsyms = hashcodesp - hashcodes; |
| 4814 | size_t minsize; |
| 4815 | size_t maxsize; |
| 4816 | BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0); |
| 4817 | unsigned long int *counts ; |
| 4818 | bfd *dynobj = elf_hash_table (info)->dynobj; |
| 4819 | const struct elf_backend_data *bed = get_elf_backend_data (dynobj); |
| 4820 | |
| 4821 | /* Possible optimization parameters: if we have NSYMS symbols we say |
| 4822 | that the hashing table must at least have NSYMS/4 and at most |
| 4823 | 2*NSYMS buckets. */ |
| 4824 | minsize = nsyms / 4; |
| 4825 | if (minsize == 0) |
| 4826 | minsize = 1; |
| 4827 | best_size = maxsize = nsyms * 2; |
| 4828 | |
| 4829 | /* Create array where we count the collisions in. We must use bfd_malloc |
| 4830 | since the size could be large. */ |
| 4831 | amt = maxsize; |
| 4832 | amt *= sizeof (unsigned long int); |
| 4833 | counts = bfd_malloc (amt); |
| 4834 | if (counts == NULL) |
| 4835 | { |
| 4836 | free (hashcodes); |
| 4837 | return 0; |
| 4838 | } |
| 4839 | |
| 4840 | /* Compute the "optimal" size for the hash table. The criteria is a |
| 4841 | minimal chain length. The minor criteria is (of course) the size |
| 4842 | of the table. */ |
| 4843 | for (i = minsize; i < maxsize; ++i) |
| 4844 | { |
| 4845 | /* Walk through the array of hashcodes and count the collisions. */ |
| 4846 | BFD_HOST_U_64_BIT max; |
| 4847 | unsigned long int j; |
| 4848 | unsigned long int fact; |
| 4849 | |
| 4850 | memset (counts, '\0', i * sizeof (unsigned long int)); |
| 4851 | |
| 4852 | /* Determine how often each hash bucket is used. */ |
| 4853 | for (j = 0; j < nsyms; ++j) |
| 4854 | ++counts[hashcodes[j] % i]; |
| 4855 | |
| 4856 | /* For the weight function we need some information about the |
| 4857 | pagesize on the target. This is information need not be 100% |
| 4858 | accurate. Since this information is not available (so far) we |
| 4859 | define it here to a reasonable default value. If it is crucial |
| 4860 | to have a better value some day simply define this value. */ |
| 4861 | # ifndef BFD_TARGET_PAGESIZE |
| 4862 | # define BFD_TARGET_PAGESIZE (4096) |
| 4863 | # endif |
| 4864 | |
| 4865 | /* We in any case need 2 + NSYMS entries for the size values and |
| 4866 | the chains. */ |
| 4867 | max = (2 + nsyms) * (bed->s->arch_size / 8); |
| 4868 | |
| 4869 | # if 1 |
| 4870 | /* Variant 1: optimize for short chains. We add the squares |
| 4871 | of all the chain lengths (which favors many small chain |
| 4872 | over a few long chains). */ |
| 4873 | for (j = 0; j < i; ++j) |
| 4874 | max += counts[j] * counts[j]; |
| 4875 | |
| 4876 | /* This adds penalties for the overall size of the table. */ |
| 4877 | fact = i / (BFD_TARGET_PAGESIZE / (bed->s->arch_size / 8)) + 1; |
| 4878 | max *= fact * fact; |
| 4879 | # else |
| 4880 | /* Variant 2: Optimize a lot more for small table. Here we |
| 4881 | also add squares of the size but we also add penalties for |
| 4882 | empty slots (the +1 term). */ |
| 4883 | for (j = 0; j < i; ++j) |
| 4884 | max += (1 + counts[j]) * (1 + counts[j]); |
| 4885 | |
| 4886 | /* The overall size of the table is considered, but not as |
| 4887 | strong as in variant 1, where it is squared. */ |
| 4888 | fact = i / (BFD_TARGET_PAGESIZE / (bed->s->arch_size / 8)) + 1; |
| 4889 | max *= fact; |
| 4890 | # endif |
| 4891 | |
| 4892 | /* Compare with current best results. */ |
| 4893 | if (max < best_chlen) |
| 4894 | { |
| 4895 | best_chlen = max; |
| 4896 | best_size = i; |
| 4897 | } |
| 4898 | } |
| 4899 | |
| 4900 | free (counts); |
| 4901 | } |
| 4902 | else |
| 4903 | #endif /* defined (BFD_HOST_U_64_BIT) */ |
| 4904 | { |
| 4905 | /* This is the fallback solution if no 64bit type is available or if we |
| 4906 | are not supposed to spend much time on optimizations. We select the |
| 4907 | bucket count using a fixed set of numbers. */ |
| 4908 | for (i = 0; elf_buckets[i] != 0; i++) |
| 4909 | { |
| 4910 | best_size = elf_buckets[i]; |
| 4911 | if (dynsymcount < elf_buckets[i + 1]) |
| 4912 | break; |
| 4913 | } |
| 4914 | } |
| 4915 | |
| 4916 | /* Free the arrays we needed. */ |
| 4917 | free (hashcodes); |
| 4918 | |
| 4919 | return best_size; |
| 4920 | } |
| 4921 | |
| 4922 | /* Set up the sizes and contents of the ELF dynamic sections. This is |
| 4923 | called by the ELF linker emulation before_allocation routine. We |
| 4924 | must set the sizes of the sections before the linker sets the |
| 4925 | addresses of the various sections. */ |
| 4926 | |
| 4927 | bfd_boolean |
| 4928 | bfd_elf_size_dynamic_sections (bfd *output_bfd, |
| 4929 | const char *soname, |
| 4930 | const char *rpath, |
| 4931 | const char *filter_shlib, |
| 4932 | const char * const *auxiliary_filters, |
| 4933 | struct bfd_link_info *info, |
| 4934 | asection **sinterpptr, |
| 4935 | struct bfd_elf_version_tree *verdefs) |
| 4936 | { |
| 4937 | bfd_size_type soname_indx; |
| 4938 | bfd *dynobj; |
| 4939 | const struct elf_backend_data *bed; |
| 4940 | struct elf_assign_sym_version_info asvinfo; |
| 4941 | |
| 4942 | *sinterpptr = NULL; |
| 4943 | |
| 4944 | soname_indx = (bfd_size_type) -1; |
| 4945 | |
| 4946 | if (!is_elf_hash_table (info->hash)) |
| 4947 | return TRUE; |
| 4948 | |
| 4949 | elf_tdata (output_bfd)->relro = info->relro; |
| 4950 | if (info->execstack) |
| 4951 | elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X; |
| 4952 | else if (info->noexecstack) |
| 4953 | elf_tdata (output_bfd)->stack_flags = PF_R | PF_W; |
| 4954 | else |
| 4955 | { |
| 4956 | bfd *inputobj; |
| 4957 | asection *notesec = NULL; |
| 4958 | int exec = 0; |
| 4959 | |
| 4960 | for (inputobj = info->input_bfds; |
| 4961 | inputobj; |
| 4962 | inputobj = inputobj->link_next) |
| 4963 | { |
| 4964 | asection *s; |
| 4965 | |
| 4966 | if (inputobj->flags & (DYNAMIC | BFD_LINKER_CREATED)) |
| 4967 | continue; |
| 4968 | s = bfd_get_section_by_name (inputobj, ".note.GNU-stack"); |
| 4969 | if (s) |
| 4970 | { |
| 4971 | if (s->flags & SEC_CODE) |
| 4972 | exec = PF_X; |
| 4973 | notesec = s; |
| 4974 | } |
| 4975 | else |
| 4976 | exec = PF_X; |
| 4977 | } |
| 4978 | if (notesec) |
| 4979 | { |
| 4980 | elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | exec; |
| 4981 | if (exec && info->relocatable |
| 4982 | && notesec->output_section != bfd_abs_section_ptr) |
| 4983 | notesec->output_section->flags |= SEC_CODE; |
| 4984 | } |
| 4985 | } |
| 4986 | |
| 4987 | /* Any syms created from now on start with -1 in |
| 4988 | got.refcount/offset and plt.refcount/offset. */ |
| 4989 | elf_hash_table (info)->init_got_refcount |
| 4990 | = elf_hash_table (info)->init_got_offset; |
| 4991 | elf_hash_table (info)->init_plt_refcount |
| 4992 | = elf_hash_table (info)->init_plt_offset; |
| 4993 | |
| 4994 | /* The backend may have to create some sections regardless of whether |
| 4995 | we're dynamic or not. */ |
| 4996 | bed = get_elf_backend_data (output_bfd); |
| 4997 | if (bed->elf_backend_always_size_sections |
| 4998 | && ! (*bed->elf_backend_always_size_sections) (output_bfd, info)) |
| 4999 | return FALSE; |
| 5000 | |
| 5001 | dynobj = elf_hash_table (info)->dynobj; |
| 5002 | |
| 5003 | /* If there were no dynamic objects in the link, there is nothing to |
| 5004 | do here. */ |
| 5005 | if (dynobj == NULL) |
| 5006 | return TRUE; |
| 5007 | |
| 5008 | if (! _bfd_elf_maybe_strip_eh_frame_hdr (info)) |
| 5009 | return FALSE; |
| 5010 | |
| 5011 | if (elf_hash_table (info)->dynamic_sections_created) |
| 5012 | { |
| 5013 | struct elf_info_failed eif; |
| 5014 | struct elf_link_hash_entry *h; |
| 5015 | asection *dynstr; |
| 5016 | struct bfd_elf_version_tree *t; |
| 5017 | struct bfd_elf_version_expr *d; |
| 5018 | bfd_boolean all_defined; |
| 5019 | |
| 5020 | *sinterpptr = bfd_get_section_by_name (dynobj, ".interp"); |
| 5021 | BFD_ASSERT (*sinterpptr != NULL || !info->executable); |
| 5022 | |
| 5023 | if (soname != NULL) |
| 5024 | { |
| 5025 | soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 5026 | soname, TRUE); |
| 5027 | if (soname_indx == (bfd_size_type) -1 |
| 5028 | || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx)) |
| 5029 | return FALSE; |
| 5030 | } |
| 5031 | |
| 5032 | if (info->symbolic) |
| 5033 | { |
| 5034 | if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0)) |
| 5035 | return FALSE; |
| 5036 | info->flags |= DF_SYMBOLIC; |
| 5037 | } |
| 5038 | |
| 5039 | if (rpath != NULL) |
| 5040 | { |
| 5041 | bfd_size_type indx; |
| 5042 | |
| 5043 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath, |
| 5044 | TRUE); |
| 5045 | if (indx == (bfd_size_type) -1 |
| 5046 | || !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx)) |
| 5047 | return FALSE; |
| 5048 | |
| 5049 | if (info->new_dtags) |
| 5050 | { |
| 5051 | _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx); |
| 5052 | if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, indx)) |
| 5053 | return FALSE; |
| 5054 | } |
| 5055 | } |
| 5056 | |
| 5057 | if (filter_shlib != NULL) |
| 5058 | { |
| 5059 | bfd_size_type indx; |
| 5060 | |
| 5061 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 5062 | filter_shlib, TRUE); |
| 5063 | if (indx == (bfd_size_type) -1 |
| 5064 | || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx)) |
| 5065 | return FALSE; |
| 5066 | } |
| 5067 | |
| 5068 | if (auxiliary_filters != NULL) |
| 5069 | { |
| 5070 | const char * const *p; |
| 5071 | |
| 5072 | for (p = auxiliary_filters; *p != NULL; p++) |
| 5073 | { |
| 5074 | bfd_size_type indx; |
| 5075 | |
| 5076 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 5077 | *p, TRUE); |
| 5078 | if (indx == (bfd_size_type) -1 |
| 5079 | || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx)) |
| 5080 | return FALSE; |
| 5081 | } |
| 5082 | } |
| 5083 | |
| 5084 | eif.info = info; |
| 5085 | eif.verdefs = verdefs; |
| 5086 | eif.failed = FALSE; |
| 5087 | |
| 5088 | /* If we are supposed to export all symbols into the dynamic symbol |
| 5089 | table (this is not the normal case), then do so. */ |
| 5090 | if (info->export_dynamic) |
| 5091 | { |
| 5092 | elf_link_hash_traverse (elf_hash_table (info), |
| 5093 | _bfd_elf_export_symbol, |
| 5094 | &eif); |
| 5095 | if (eif.failed) |
| 5096 | return FALSE; |
| 5097 | } |
| 5098 | |
| 5099 | /* Make all global versions with definition. */ |
| 5100 | for (t = verdefs; t != NULL; t = t->next) |
| 5101 | for (d = t->globals.list; d != NULL; d = d->next) |
| 5102 | if (!d->symver && d->symbol) |
| 5103 | { |
| 5104 | const char *verstr, *name; |
| 5105 | size_t namelen, verlen, newlen; |
| 5106 | char *newname, *p; |
| 5107 | struct elf_link_hash_entry *newh; |
| 5108 | |
| 5109 | name = d->symbol; |
| 5110 | namelen = strlen (name); |
| 5111 | verstr = t->name; |
| 5112 | verlen = strlen (verstr); |
| 5113 | newlen = namelen + verlen + 3; |
| 5114 | |
| 5115 | newname = bfd_malloc (newlen); |
| 5116 | if (newname == NULL) |
| 5117 | return FALSE; |
| 5118 | memcpy (newname, name, namelen); |
| 5119 | |
| 5120 | /* Check the hidden versioned definition. */ |
| 5121 | p = newname + namelen; |
| 5122 | *p++ = ELF_VER_CHR; |
| 5123 | memcpy (p, verstr, verlen + 1); |
| 5124 | newh = elf_link_hash_lookup (elf_hash_table (info), |
| 5125 | newname, FALSE, FALSE, |
| 5126 | FALSE); |
| 5127 | if (newh == NULL |
| 5128 | || (newh->root.type != bfd_link_hash_defined |
| 5129 | && newh->root.type != bfd_link_hash_defweak)) |
| 5130 | { |
| 5131 | /* Check the default versioned definition. */ |
| 5132 | *p++ = ELF_VER_CHR; |
| 5133 | memcpy (p, verstr, verlen + 1); |
| 5134 | newh = elf_link_hash_lookup (elf_hash_table (info), |
| 5135 | newname, FALSE, FALSE, |
| 5136 | FALSE); |
| 5137 | } |
| 5138 | free (newname); |
| 5139 | |
| 5140 | /* Mark this version if there is a definition and it is |
| 5141 | not defined in a shared object. */ |
| 5142 | if (newh != NULL |
| 5143 | && !newh->def_dynamic |
| 5144 | && (newh->root.type == bfd_link_hash_defined |
| 5145 | || newh->root.type == bfd_link_hash_defweak)) |
| 5146 | d->symver = 1; |
| 5147 | } |
| 5148 | |
| 5149 | /* Attach all the symbols to their version information. */ |
| 5150 | asvinfo.output_bfd = output_bfd; |
| 5151 | asvinfo.info = info; |
| 5152 | asvinfo.verdefs = verdefs; |
| 5153 | asvinfo.failed = FALSE; |
| 5154 | |
| 5155 | elf_link_hash_traverse (elf_hash_table (info), |
| 5156 | _bfd_elf_link_assign_sym_version, |
| 5157 | &asvinfo); |
| 5158 | if (asvinfo.failed) |
| 5159 | return FALSE; |
| 5160 | |
| 5161 | if (!info->allow_undefined_version) |
| 5162 | { |
| 5163 | /* Check if all global versions have a definition. */ |
| 5164 | all_defined = TRUE; |
| 5165 | for (t = verdefs; t != NULL; t = t->next) |
| 5166 | for (d = t->globals.list; d != NULL; d = d->next) |
| 5167 | if (!d->symver && !d->script) |
| 5168 | { |
| 5169 | (*_bfd_error_handler) |
| 5170 | (_("%s: undefined version: %s"), |
| 5171 | d->pattern, t->name); |
| 5172 | all_defined = FALSE; |
| 5173 | } |
| 5174 | |
| 5175 | if (!all_defined) |
| 5176 | { |
| 5177 | bfd_set_error (bfd_error_bad_value); |
| 5178 | return FALSE; |
| 5179 | } |
| 5180 | } |
| 5181 | |
| 5182 | /* Find all symbols which were defined in a dynamic object and make |
| 5183 | the backend pick a reasonable value for them. */ |
| 5184 | elf_link_hash_traverse (elf_hash_table (info), |
| 5185 | _bfd_elf_adjust_dynamic_symbol, |
| 5186 | &eif); |
| 5187 | if (eif.failed) |
| 5188 | return FALSE; |
| 5189 | |
| 5190 | /* Add some entries to the .dynamic section. We fill in some of the |
| 5191 | values later, in bfd_elf_final_link, but we must add the entries |
| 5192 | now so that we know the final size of the .dynamic section. */ |
| 5193 | |
| 5194 | /* If there are initialization and/or finalization functions to |
| 5195 | call then add the corresponding DT_INIT/DT_FINI entries. */ |
| 5196 | h = (info->init_function |
| 5197 | ? elf_link_hash_lookup (elf_hash_table (info), |
| 5198 | info->init_function, FALSE, |
| 5199 | FALSE, FALSE) |
| 5200 | : NULL); |
| 5201 | if (h != NULL |
| 5202 | && (h->ref_regular |
| 5203 | || h->def_regular)) |
| 5204 | { |
| 5205 | if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0)) |
| 5206 | return FALSE; |
| 5207 | } |
| 5208 | h = (info->fini_function |
| 5209 | ? elf_link_hash_lookup (elf_hash_table (info), |
| 5210 | info->fini_function, FALSE, |
| 5211 | FALSE, FALSE) |
| 5212 | : NULL); |
| 5213 | if (h != NULL |
| 5214 | && (h->ref_regular |
| 5215 | || h->def_regular)) |
| 5216 | { |
| 5217 | if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0)) |
| 5218 | return FALSE; |
| 5219 | } |
| 5220 | |
| 5221 | if (bfd_get_section_by_name (output_bfd, ".preinit_array") != NULL) |
| 5222 | { |
| 5223 | /* DT_PREINIT_ARRAY is not allowed in shared library. */ |
| 5224 | if (! info->executable) |
| 5225 | { |
| 5226 | bfd *sub; |
| 5227 | asection *o; |
| 5228 | |
| 5229 | for (sub = info->input_bfds; sub != NULL; |
| 5230 | sub = sub->link_next) |
| 5231 | for (o = sub->sections; o != NULL; o = o->next) |
| 5232 | if (elf_section_data (o)->this_hdr.sh_type |
| 5233 | == SHT_PREINIT_ARRAY) |
| 5234 | { |
| 5235 | (*_bfd_error_handler) |
| 5236 | (_("%B: .preinit_array section is not allowed in DSO"), |
| 5237 | sub); |
| 5238 | break; |
| 5239 | } |
| 5240 | |
| 5241 | bfd_set_error (bfd_error_nonrepresentable_section); |
| 5242 | return FALSE; |
| 5243 | } |
| 5244 | |
| 5245 | if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0) |
| 5246 | || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0)) |
| 5247 | return FALSE; |
| 5248 | } |
| 5249 | if (bfd_get_section_by_name (output_bfd, ".init_array") != NULL) |
| 5250 | { |
| 5251 | if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0) |
| 5252 | || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0)) |
| 5253 | return FALSE; |
| 5254 | } |
| 5255 | if (bfd_get_section_by_name (output_bfd, ".fini_array") != NULL) |
| 5256 | { |
| 5257 | if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0) |
| 5258 | || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0)) |
| 5259 | return FALSE; |
| 5260 | } |
| 5261 | |
| 5262 | dynstr = bfd_get_section_by_name (dynobj, ".dynstr"); |
| 5263 | /* If .dynstr is excluded from the link, we don't want any of |
| 5264 | these tags. Strictly, we should be checking each section |
| 5265 | individually; This quick check covers for the case where |
| 5266 | someone does a /DISCARD/ : { *(*) }. */ |
| 5267 | if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr) |
| 5268 | { |
| 5269 | bfd_size_type strsize; |
| 5270 | |
| 5271 | strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr); |
| 5272 | if (!_bfd_elf_add_dynamic_entry (info, DT_HASH, 0) |
| 5273 | || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0) |
| 5274 | || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0) |
| 5275 | || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize) |
| 5276 | || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT, |
| 5277 | bed->s->sizeof_sym)) |
| 5278 | return FALSE; |
| 5279 | } |
| 5280 | } |
| 5281 | |
| 5282 | /* The backend must work out the sizes of all the other dynamic |
| 5283 | sections. */ |
| 5284 | if (bed->elf_backend_size_dynamic_sections |
| 5285 | && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info)) |
| 5286 | return FALSE; |
| 5287 | |
| 5288 | if (elf_hash_table (info)->dynamic_sections_created) |
| 5289 | { |
| 5290 | unsigned long section_sym_count; |
| 5291 | asection *s; |
| 5292 | |
| 5293 | /* Set up the version definition section. */ |
| 5294 | s = bfd_get_section_by_name (dynobj, ".gnu.version_d"); |
| 5295 | BFD_ASSERT (s != NULL); |
| 5296 | |
| 5297 | /* We may have created additional version definitions if we are |
| 5298 | just linking a regular application. */ |
| 5299 | verdefs = asvinfo.verdefs; |
| 5300 | |
| 5301 | /* Skip anonymous version tag. */ |
| 5302 | if (verdefs != NULL && verdefs->vernum == 0) |
| 5303 | verdefs = verdefs->next; |
| 5304 | |
| 5305 | if (verdefs == NULL && !info->create_default_symver) |
| 5306 | s->flags |= SEC_EXCLUDE; |
| 5307 | else |
| 5308 | { |
| 5309 | unsigned int cdefs; |
| 5310 | bfd_size_type size; |
| 5311 | struct bfd_elf_version_tree *t; |
| 5312 | bfd_byte *p; |
| 5313 | Elf_Internal_Verdef def; |
| 5314 | Elf_Internal_Verdaux defaux; |
| 5315 | struct bfd_link_hash_entry *bh; |
| 5316 | struct elf_link_hash_entry *h; |
| 5317 | const char *name; |
| 5318 | |
| 5319 | cdefs = 0; |
| 5320 | size = 0; |
| 5321 | |
| 5322 | /* Make space for the base version. */ |
| 5323 | size += sizeof (Elf_External_Verdef); |
| 5324 | size += sizeof (Elf_External_Verdaux); |
| 5325 | ++cdefs; |
| 5326 | |
| 5327 | /* Make space for the default version. */ |
| 5328 | if (info->create_default_symver) |
| 5329 | { |
| 5330 | size += sizeof (Elf_External_Verdef); |
| 5331 | ++cdefs; |
| 5332 | } |
| 5333 | |
| 5334 | for (t = verdefs; t != NULL; t = t->next) |
| 5335 | { |
| 5336 | struct bfd_elf_version_deps *n; |
| 5337 | |
| 5338 | size += sizeof (Elf_External_Verdef); |
| 5339 | size += sizeof (Elf_External_Verdaux); |
| 5340 | ++cdefs; |
| 5341 | |
| 5342 | for (n = t->deps; n != NULL; n = n->next) |
| 5343 | size += sizeof (Elf_External_Verdaux); |
| 5344 | } |
| 5345 | |
| 5346 | s->size = size; |
| 5347 | s->contents = bfd_alloc (output_bfd, s->size); |
| 5348 | if (s->contents == NULL && s->size != 0) |
| 5349 | return FALSE; |
| 5350 | |
| 5351 | /* Fill in the version definition section. */ |
| 5352 | |
| 5353 | p = s->contents; |
| 5354 | |
| 5355 | def.vd_version = VER_DEF_CURRENT; |
| 5356 | def.vd_flags = VER_FLG_BASE; |
| 5357 | def.vd_ndx = 1; |
| 5358 | def.vd_cnt = 1; |
| 5359 | if (info->create_default_symver) |
| 5360 | { |
| 5361 | def.vd_aux = 2 * sizeof (Elf_External_Verdef); |
| 5362 | def.vd_next = sizeof (Elf_External_Verdef); |
| 5363 | } |
| 5364 | else |
| 5365 | { |
| 5366 | def.vd_aux = sizeof (Elf_External_Verdef); |
| 5367 | def.vd_next = (sizeof (Elf_External_Verdef) |
| 5368 | + sizeof (Elf_External_Verdaux)); |
| 5369 | } |
| 5370 | |
| 5371 | if (soname_indx != (bfd_size_type) -1) |
| 5372 | { |
| 5373 | _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, |
| 5374 | soname_indx); |
| 5375 | def.vd_hash = bfd_elf_hash (soname); |
| 5376 | defaux.vda_name = soname_indx; |
| 5377 | name = soname; |
| 5378 | } |
| 5379 | else |
| 5380 | { |
| 5381 | bfd_size_type indx; |
| 5382 | |
| 5383 | name = lbasename (output_bfd->filename); |
| 5384 | def.vd_hash = bfd_elf_hash (name); |
| 5385 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 5386 | name, FALSE); |
| 5387 | if (indx == (bfd_size_type) -1) |
| 5388 | return FALSE; |
| 5389 | defaux.vda_name = indx; |
| 5390 | } |
| 5391 | defaux.vda_next = 0; |
| 5392 | |
| 5393 | _bfd_elf_swap_verdef_out (output_bfd, &def, |
| 5394 | (Elf_External_Verdef *) p); |
| 5395 | p += sizeof (Elf_External_Verdef); |
| 5396 | if (info->create_default_symver) |
| 5397 | { |
| 5398 | /* Add a symbol representing this version. */ |
| 5399 | bh = NULL; |
| 5400 | if (! (_bfd_generic_link_add_one_symbol |
| 5401 | (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr, |
| 5402 | 0, NULL, FALSE, |
| 5403 | get_elf_backend_data (dynobj)->collect, &bh))) |
| 5404 | return FALSE; |
| 5405 | h = (struct elf_link_hash_entry *) bh; |
| 5406 | h->non_elf = 0; |
| 5407 | h->def_regular = 1; |
| 5408 | h->type = STT_OBJECT; |
| 5409 | h->verinfo.vertree = NULL; |
| 5410 | |
| 5411 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 5412 | return FALSE; |
| 5413 | |
| 5414 | /* Create a duplicate of the base version with the same |
| 5415 | aux block, but different flags. */ |
| 5416 | def.vd_flags = 0; |
| 5417 | def.vd_ndx = 2; |
| 5418 | def.vd_aux = sizeof (Elf_External_Verdef); |
| 5419 | if (verdefs) |
| 5420 | def.vd_next = (sizeof (Elf_External_Verdef) |
| 5421 | + sizeof (Elf_External_Verdaux)); |
| 5422 | else |
| 5423 | def.vd_next = 0; |
| 5424 | _bfd_elf_swap_verdef_out (output_bfd, &def, |
| 5425 | (Elf_External_Verdef *) p); |
| 5426 | p += sizeof (Elf_External_Verdef); |
| 5427 | } |
| 5428 | _bfd_elf_swap_verdaux_out (output_bfd, &defaux, |
| 5429 | (Elf_External_Verdaux *) p); |
| 5430 | p += sizeof (Elf_External_Verdaux); |
| 5431 | |
| 5432 | for (t = verdefs; t != NULL; t = t->next) |
| 5433 | { |
| 5434 | unsigned int cdeps; |
| 5435 | struct bfd_elf_version_deps *n; |
| 5436 | |
| 5437 | cdeps = 0; |
| 5438 | for (n = t->deps; n != NULL; n = n->next) |
| 5439 | ++cdeps; |
| 5440 | |
| 5441 | /* Add a symbol representing this version. */ |
| 5442 | bh = NULL; |
| 5443 | if (! (_bfd_generic_link_add_one_symbol |
| 5444 | (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr, |
| 5445 | 0, NULL, FALSE, |
| 5446 | get_elf_backend_data (dynobj)->collect, &bh))) |
| 5447 | return FALSE; |
| 5448 | h = (struct elf_link_hash_entry *) bh; |
| 5449 | h->non_elf = 0; |
| 5450 | h->def_regular = 1; |
| 5451 | h->type = STT_OBJECT; |
| 5452 | h->verinfo.vertree = t; |
| 5453 | |
| 5454 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 5455 | return FALSE; |
| 5456 | |
| 5457 | def.vd_version = VER_DEF_CURRENT; |
| 5458 | def.vd_flags = 0; |
| 5459 | if (t->globals.list == NULL |
| 5460 | && t->locals.list == NULL |
| 5461 | && ! t->used) |
| 5462 | def.vd_flags |= VER_FLG_WEAK; |
| 5463 | def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1); |
| 5464 | def.vd_cnt = cdeps + 1; |
| 5465 | def.vd_hash = bfd_elf_hash (t->name); |
| 5466 | def.vd_aux = sizeof (Elf_External_Verdef); |
| 5467 | def.vd_next = 0; |
| 5468 | if (t->next != NULL) |
| 5469 | def.vd_next = (sizeof (Elf_External_Verdef) |
| 5470 | + (cdeps + 1) * sizeof (Elf_External_Verdaux)); |
| 5471 | |
| 5472 | _bfd_elf_swap_verdef_out (output_bfd, &def, |
| 5473 | (Elf_External_Verdef *) p); |
| 5474 | p += sizeof (Elf_External_Verdef); |
| 5475 | |
| 5476 | defaux.vda_name = h->dynstr_index; |
| 5477 | _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, |
| 5478 | h->dynstr_index); |
| 5479 | defaux.vda_next = 0; |
| 5480 | if (t->deps != NULL) |
| 5481 | defaux.vda_next = sizeof (Elf_External_Verdaux); |
| 5482 | t->name_indx = defaux.vda_name; |
| 5483 | |
| 5484 | _bfd_elf_swap_verdaux_out (output_bfd, &defaux, |
| 5485 | (Elf_External_Verdaux *) p); |
| 5486 | p += sizeof (Elf_External_Verdaux); |
| 5487 | |
| 5488 | for (n = t->deps; n != NULL; n = n->next) |
| 5489 | { |
| 5490 | if (n->version_needed == NULL) |
| 5491 | { |
| 5492 | /* This can happen if there was an error in the |
| 5493 | version script. */ |
| 5494 | defaux.vda_name = 0; |
| 5495 | } |
| 5496 | else |
| 5497 | { |
| 5498 | defaux.vda_name = n->version_needed->name_indx; |
| 5499 | _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, |
| 5500 | defaux.vda_name); |
| 5501 | } |
| 5502 | if (n->next == NULL) |
| 5503 | defaux.vda_next = 0; |
| 5504 | else |
| 5505 | defaux.vda_next = sizeof (Elf_External_Verdaux); |
| 5506 | |
| 5507 | _bfd_elf_swap_verdaux_out (output_bfd, &defaux, |
| 5508 | (Elf_External_Verdaux *) p); |
| 5509 | p += sizeof (Elf_External_Verdaux); |
| 5510 | } |
| 5511 | } |
| 5512 | |
| 5513 | if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0) |
| 5514 | || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs)) |
| 5515 | return FALSE; |
| 5516 | |
| 5517 | elf_tdata (output_bfd)->cverdefs = cdefs; |
| 5518 | } |
| 5519 | |
| 5520 | if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS)) |
| 5521 | { |
| 5522 | if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags)) |
| 5523 | return FALSE; |
| 5524 | } |
| 5525 | else if (info->flags & DF_BIND_NOW) |
| 5526 | { |
| 5527 | if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0)) |
| 5528 | return FALSE; |
| 5529 | } |
| 5530 | |
| 5531 | if (info->flags_1) |
| 5532 | { |
| 5533 | if (info->executable) |
| 5534 | info->flags_1 &= ~ (DF_1_INITFIRST |
| 5535 | | DF_1_NODELETE |
| 5536 | | DF_1_NOOPEN); |
| 5537 | if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1)) |
| 5538 | return FALSE; |
| 5539 | } |
| 5540 | |
| 5541 | /* Work out the size of the version reference section. */ |
| 5542 | |
| 5543 | s = bfd_get_section_by_name (dynobj, ".gnu.version_r"); |
| 5544 | BFD_ASSERT (s != NULL); |
| 5545 | { |
| 5546 | struct elf_find_verdep_info sinfo; |
| 5547 | |
| 5548 | sinfo.output_bfd = output_bfd; |
| 5549 | sinfo.info = info; |
| 5550 | sinfo.vers = elf_tdata (output_bfd)->cverdefs; |
| 5551 | if (sinfo.vers == 0) |
| 5552 | sinfo.vers = 1; |
| 5553 | sinfo.failed = FALSE; |
| 5554 | |
| 5555 | elf_link_hash_traverse (elf_hash_table (info), |
| 5556 | _bfd_elf_link_find_version_dependencies, |
| 5557 | &sinfo); |
| 5558 | |
| 5559 | if (elf_tdata (output_bfd)->verref == NULL) |
| 5560 | s->flags |= SEC_EXCLUDE; |
| 5561 | else |
| 5562 | { |
| 5563 | Elf_Internal_Verneed *t; |
| 5564 | unsigned int size; |
| 5565 | unsigned int crefs; |
| 5566 | bfd_byte *p; |
| 5567 | |
| 5568 | /* Build the version definition section. */ |
| 5569 | size = 0; |
| 5570 | crefs = 0; |
| 5571 | for (t = elf_tdata (output_bfd)->verref; |
| 5572 | t != NULL; |
| 5573 | t = t->vn_nextref) |
| 5574 | { |
| 5575 | Elf_Internal_Vernaux *a; |
| 5576 | |
| 5577 | size += sizeof (Elf_External_Verneed); |
| 5578 | ++crefs; |
| 5579 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 5580 | size += sizeof (Elf_External_Vernaux); |
| 5581 | } |
| 5582 | |
| 5583 | s->size = size; |
| 5584 | s->contents = bfd_alloc (output_bfd, s->size); |
| 5585 | if (s->contents == NULL) |
| 5586 | return FALSE; |
| 5587 | |
| 5588 | p = s->contents; |
| 5589 | for (t = elf_tdata (output_bfd)->verref; |
| 5590 | t != NULL; |
| 5591 | t = t->vn_nextref) |
| 5592 | { |
| 5593 | unsigned int caux; |
| 5594 | Elf_Internal_Vernaux *a; |
| 5595 | bfd_size_type indx; |
| 5596 | |
| 5597 | caux = 0; |
| 5598 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 5599 | ++caux; |
| 5600 | |
| 5601 | t->vn_version = VER_NEED_CURRENT; |
| 5602 | t->vn_cnt = caux; |
| 5603 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 5604 | elf_dt_name (t->vn_bfd) != NULL |
| 5605 | ? elf_dt_name (t->vn_bfd) |
| 5606 | : lbasename (t->vn_bfd->filename), |
| 5607 | FALSE); |
| 5608 | if (indx == (bfd_size_type) -1) |
| 5609 | return FALSE; |
| 5610 | t->vn_file = indx; |
| 5611 | t->vn_aux = sizeof (Elf_External_Verneed); |
| 5612 | if (t->vn_nextref == NULL) |
| 5613 | t->vn_next = 0; |
| 5614 | else |
| 5615 | t->vn_next = (sizeof (Elf_External_Verneed) |
| 5616 | + caux * sizeof (Elf_External_Vernaux)); |
| 5617 | |
| 5618 | _bfd_elf_swap_verneed_out (output_bfd, t, |
| 5619 | (Elf_External_Verneed *) p); |
| 5620 | p += sizeof (Elf_External_Verneed); |
| 5621 | |
| 5622 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 5623 | { |
| 5624 | a->vna_hash = bfd_elf_hash (a->vna_nodename); |
| 5625 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 5626 | a->vna_nodename, FALSE); |
| 5627 | if (indx == (bfd_size_type) -1) |
| 5628 | return FALSE; |
| 5629 | a->vna_name = indx; |
| 5630 | if (a->vna_nextptr == NULL) |
| 5631 | a->vna_next = 0; |
| 5632 | else |
| 5633 | a->vna_next = sizeof (Elf_External_Vernaux); |
| 5634 | |
| 5635 | _bfd_elf_swap_vernaux_out (output_bfd, a, |
| 5636 | (Elf_External_Vernaux *) p); |
| 5637 | p += sizeof (Elf_External_Vernaux); |
| 5638 | } |
| 5639 | } |
| 5640 | |
| 5641 | if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0) |
| 5642 | || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs)) |
| 5643 | return FALSE; |
| 5644 | |
| 5645 | elf_tdata (output_bfd)->cverrefs = crefs; |
| 5646 | } |
| 5647 | } |
| 5648 | |
| 5649 | if ((elf_tdata (output_bfd)->cverrefs == 0 |
| 5650 | && elf_tdata (output_bfd)->cverdefs == 0) |
| 5651 | || _bfd_elf_link_renumber_dynsyms (output_bfd, info, |
| 5652 | §ion_sym_count) == 0) |
| 5653 | { |
| 5654 | s = bfd_get_section_by_name (dynobj, ".gnu.version"); |
| 5655 | s->flags |= SEC_EXCLUDE; |
| 5656 | } |
| 5657 | } |
| 5658 | return TRUE; |
| 5659 | } |
| 5660 | |
| 5661 | bfd_boolean |
| 5662 | bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info) |
| 5663 | { |
| 5664 | if (!is_elf_hash_table (info->hash)) |
| 5665 | return TRUE; |
| 5666 | |
| 5667 | if (elf_hash_table (info)->dynamic_sections_created) |
| 5668 | { |
| 5669 | bfd *dynobj; |
| 5670 | const struct elf_backend_data *bed; |
| 5671 | asection *s; |
| 5672 | bfd_size_type dynsymcount; |
| 5673 | unsigned long section_sym_count; |
| 5674 | size_t bucketcount = 0; |
| 5675 | size_t hash_entry_size; |
| 5676 | unsigned int dtagcount; |
| 5677 | |
| 5678 | dynobj = elf_hash_table (info)->dynobj; |
| 5679 | |
| 5680 | /* Assign dynsym indicies. In a shared library we generate a |
| 5681 | section symbol for each output section, which come first. |
| 5682 | Next come all of the back-end allocated local dynamic syms, |
| 5683 | followed by the rest of the global symbols. */ |
| 5684 | |
| 5685 | dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info, |
| 5686 | §ion_sym_count); |
| 5687 | |
| 5688 | /* Work out the size of the symbol version section. */ |
| 5689 | s = bfd_get_section_by_name (dynobj, ".gnu.version"); |
| 5690 | BFD_ASSERT (s != NULL); |
| 5691 | if (dynsymcount != 0 |
| 5692 | && (s->flags & SEC_EXCLUDE) == 0) |
| 5693 | { |
| 5694 | s->size = dynsymcount * sizeof (Elf_External_Versym); |
| 5695 | s->contents = bfd_zalloc (output_bfd, s->size); |
| 5696 | if (s->contents == NULL) |
| 5697 | return FALSE; |
| 5698 | |
| 5699 | if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0)) |
| 5700 | return FALSE; |
| 5701 | } |
| 5702 | |
| 5703 | /* Set the size of the .dynsym and .hash sections. We counted |
| 5704 | the number of dynamic symbols in elf_link_add_object_symbols. |
| 5705 | We will build the contents of .dynsym and .hash when we build |
| 5706 | the final symbol table, because until then we do not know the |
| 5707 | correct value to give the symbols. We built the .dynstr |
| 5708 | section as we went along in elf_link_add_object_symbols. */ |
| 5709 | s = bfd_get_section_by_name (dynobj, ".dynsym"); |
| 5710 | BFD_ASSERT (s != NULL); |
| 5711 | bed = get_elf_backend_data (output_bfd); |
| 5712 | s->size = dynsymcount * bed->s->sizeof_sym; |
| 5713 | |
| 5714 | if (dynsymcount != 0) |
| 5715 | { |
| 5716 | s->contents = bfd_alloc (output_bfd, s->size); |
| 5717 | if (s->contents == NULL) |
| 5718 | return FALSE; |
| 5719 | |
| 5720 | /* The first entry in .dynsym is a dummy symbol. |
| 5721 | Clear all the section syms, in case we don't output them all. */ |
| 5722 | ++section_sym_count; |
| 5723 | memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym); |
| 5724 | } |
| 5725 | |
| 5726 | /* Compute the size of the hashing table. As a side effect this |
| 5727 | computes the hash values for all the names we export. */ |
| 5728 | bucketcount = compute_bucket_count (info); |
| 5729 | |
| 5730 | s = bfd_get_section_by_name (dynobj, ".hash"); |
| 5731 | BFD_ASSERT (s != NULL); |
| 5732 | hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize; |
| 5733 | s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size); |
| 5734 | s->contents = bfd_zalloc (output_bfd, s->size); |
| 5735 | if (s->contents == NULL) |
| 5736 | return FALSE; |
| 5737 | |
| 5738 | bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents); |
| 5739 | bfd_put (8 * hash_entry_size, output_bfd, dynsymcount, |
| 5740 | s->contents + hash_entry_size); |
| 5741 | |
| 5742 | elf_hash_table (info)->bucketcount = bucketcount; |
| 5743 | |
| 5744 | s = bfd_get_section_by_name (dynobj, ".dynstr"); |
| 5745 | BFD_ASSERT (s != NULL); |
| 5746 | |
| 5747 | elf_finalize_dynstr (output_bfd, info); |
| 5748 | |
| 5749 | s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr); |
| 5750 | |
| 5751 | for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount) |
| 5752 | if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0)) |
| 5753 | return FALSE; |
| 5754 | } |
| 5755 | |
| 5756 | return TRUE; |
| 5757 | } |
| 5758 | |
| 5759 | /* Final phase of ELF linker. */ |
| 5760 | |
| 5761 | /* A structure we use to avoid passing large numbers of arguments. */ |
| 5762 | |
| 5763 | struct elf_final_link_info |
| 5764 | { |
| 5765 | /* General link information. */ |
| 5766 | struct bfd_link_info *info; |
| 5767 | /* Output BFD. */ |
| 5768 | bfd *output_bfd; |
| 5769 | /* Symbol string table. */ |
| 5770 | struct bfd_strtab_hash *symstrtab; |
| 5771 | /* .dynsym section. */ |
| 5772 | asection *dynsym_sec; |
| 5773 | /* .hash section. */ |
| 5774 | asection *hash_sec; |
| 5775 | /* symbol version section (.gnu.version). */ |
| 5776 | asection *symver_sec; |
| 5777 | /* Buffer large enough to hold contents of any section. */ |
| 5778 | bfd_byte *contents; |
| 5779 | /* Buffer large enough to hold external relocs of any section. */ |
| 5780 | void *external_relocs; |
| 5781 | /* Buffer large enough to hold internal relocs of any section. */ |
| 5782 | Elf_Internal_Rela *internal_relocs; |
| 5783 | /* Buffer large enough to hold external local symbols of any input |
| 5784 | BFD. */ |
| 5785 | bfd_byte *external_syms; |
| 5786 | /* And a buffer for symbol section indices. */ |
| 5787 | Elf_External_Sym_Shndx *locsym_shndx; |
| 5788 | /* Buffer large enough to hold internal local symbols of any input |
| 5789 | BFD. */ |
| 5790 | Elf_Internal_Sym *internal_syms; |
| 5791 | /* Array large enough to hold a symbol index for each local symbol |
| 5792 | of any input BFD. */ |
| 5793 | long *indices; |
| 5794 | /* Array large enough to hold a section pointer for each local |
| 5795 | symbol of any input BFD. */ |
| 5796 | asection **sections; |
| 5797 | /* Buffer to hold swapped out symbols. */ |
| 5798 | bfd_byte *symbuf; |
| 5799 | /* And one for symbol section indices. */ |
| 5800 | Elf_External_Sym_Shndx *symshndxbuf; |
| 5801 | /* Number of swapped out symbols in buffer. */ |
| 5802 | size_t symbuf_count; |
| 5803 | /* Number of symbols which fit in symbuf. */ |
| 5804 | size_t symbuf_size; |
| 5805 | /* And same for symshndxbuf. */ |
| 5806 | size_t shndxbuf_size; |
| 5807 | }; |
| 5808 | |
| 5809 | /* This struct is used to pass information to elf_link_output_extsym. */ |
| 5810 | |
| 5811 | struct elf_outext_info |
| 5812 | { |
| 5813 | bfd_boolean failed; |
| 5814 | bfd_boolean localsyms; |
| 5815 | struct elf_final_link_info *finfo; |
| 5816 | }; |
| 5817 | |
| 5818 | /* When performing a relocatable link, the input relocations are |
| 5819 | preserved. But, if they reference global symbols, the indices |
| 5820 | referenced must be updated. Update all the relocations in |
| 5821 | REL_HDR (there are COUNT of them), using the data in REL_HASH. */ |
| 5822 | |
| 5823 | static void |
| 5824 | elf_link_adjust_relocs (bfd *abfd, |
| 5825 | Elf_Internal_Shdr *rel_hdr, |
| 5826 | unsigned int count, |
| 5827 | struct elf_link_hash_entry **rel_hash) |
| 5828 | { |
| 5829 | unsigned int i; |
| 5830 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 5831 | bfd_byte *erela; |
| 5832 | void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *); |
| 5833 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
| 5834 | bfd_vma r_type_mask; |
| 5835 | int r_sym_shift; |
| 5836 | |
| 5837 | if (rel_hdr->sh_entsize == bed->s->sizeof_rel) |
| 5838 | { |
| 5839 | swap_in = bed->s->swap_reloc_in; |
| 5840 | swap_out = bed->s->swap_reloc_out; |
| 5841 | } |
| 5842 | else if (rel_hdr->sh_entsize == bed->s->sizeof_rela) |
| 5843 | { |
| 5844 | swap_in = bed->s->swap_reloca_in; |
| 5845 | swap_out = bed->s->swap_reloca_out; |
| 5846 | } |
| 5847 | else |
| 5848 | abort (); |
| 5849 | |
| 5850 | if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL) |
| 5851 | abort (); |
| 5852 | |
| 5853 | if (bed->s->arch_size == 32) |
| 5854 | { |
| 5855 | r_type_mask = 0xff; |
| 5856 | r_sym_shift = 8; |
| 5857 | } |
| 5858 | else |
| 5859 | { |
| 5860 | r_type_mask = 0xffffffff; |
| 5861 | r_sym_shift = 32; |
| 5862 | } |
| 5863 | |
| 5864 | erela = rel_hdr->contents; |
| 5865 | for (i = 0; i < count; i++, rel_hash++, erela += rel_hdr->sh_entsize) |
| 5866 | { |
| 5867 | Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL]; |
| 5868 | unsigned int j; |
| 5869 | |
| 5870 | if (*rel_hash == NULL) |
| 5871 | continue; |
| 5872 | |
| 5873 | BFD_ASSERT ((*rel_hash)->indx >= 0); |
| 5874 | |
| 5875 | (*swap_in) (abfd, erela, irela); |
| 5876 | for (j = 0; j < bed->s->int_rels_per_ext_rel; j++) |
| 5877 | irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift |
| 5878 | | (irela[j].r_info & r_type_mask)); |
| 5879 | (*swap_out) (abfd, irela, erela); |
| 5880 | } |
| 5881 | } |
| 5882 | |
| 5883 | struct elf_link_sort_rela |
| 5884 | { |
| 5885 | union { |
| 5886 | bfd_vma offset; |
| 5887 | bfd_vma sym_mask; |
| 5888 | } u; |
| 5889 | enum elf_reloc_type_class type; |
| 5890 | /* We use this as an array of size int_rels_per_ext_rel. */ |
| 5891 | Elf_Internal_Rela rela[1]; |
| 5892 | }; |
| 5893 | |
| 5894 | static int |
| 5895 | elf_link_sort_cmp1 (const void *A, const void *B) |
| 5896 | { |
| 5897 | const struct elf_link_sort_rela *a = A; |
| 5898 | const struct elf_link_sort_rela *b = B; |
| 5899 | int relativea, relativeb; |
| 5900 | |
| 5901 | relativea = a->type == reloc_class_relative; |
| 5902 | relativeb = b->type == reloc_class_relative; |
| 5903 | |
| 5904 | if (relativea < relativeb) |
| 5905 | return 1; |
| 5906 | if (relativea > relativeb) |
| 5907 | return -1; |
| 5908 | if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask)) |
| 5909 | return -1; |
| 5910 | if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask)) |
| 5911 | return 1; |
| 5912 | if (a->rela->r_offset < b->rela->r_offset) |
| 5913 | return -1; |
| 5914 | if (a->rela->r_offset > b->rela->r_offset) |
| 5915 | return 1; |
| 5916 | return 0; |
| 5917 | } |
| 5918 | |
| 5919 | static int |
| 5920 | elf_link_sort_cmp2 (const void *A, const void *B) |
| 5921 | { |
| 5922 | const struct elf_link_sort_rela *a = A; |
| 5923 | const struct elf_link_sort_rela *b = B; |
| 5924 | int copya, copyb; |
| 5925 | |
| 5926 | if (a->u.offset < b->u.offset) |
| 5927 | return -1; |
| 5928 | if (a->u.offset > b->u.offset) |
| 5929 | return 1; |
| 5930 | copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt); |
| 5931 | copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt); |
| 5932 | if (copya < copyb) |
| 5933 | return -1; |
| 5934 | if (copya > copyb) |
| 5935 | return 1; |
| 5936 | if (a->rela->r_offset < b->rela->r_offset) |
| 5937 | return -1; |
| 5938 | if (a->rela->r_offset > b->rela->r_offset) |
| 5939 | return 1; |
| 5940 | return 0; |
| 5941 | } |
| 5942 | |
| 5943 | static size_t |
| 5944 | elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec) |
| 5945 | { |
| 5946 | asection *reldyn; |
| 5947 | bfd_size_type count, size; |
| 5948 | size_t i, ret, sort_elt, ext_size; |
| 5949 | bfd_byte *sort, *s_non_relative, *p; |
| 5950 | struct elf_link_sort_rela *sq; |
| 5951 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 5952 | int i2e = bed->s->int_rels_per_ext_rel; |
| 5953 | void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *); |
| 5954 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
| 5955 | struct bfd_link_order *lo; |
| 5956 | bfd_vma r_sym_mask; |
| 5957 | |
| 5958 | reldyn = bfd_get_section_by_name (abfd, ".rela.dyn"); |
| 5959 | if (reldyn == NULL || reldyn->size == 0) |
| 5960 | { |
| 5961 | reldyn = bfd_get_section_by_name (abfd, ".rel.dyn"); |
| 5962 | if (reldyn == NULL || reldyn->size == 0) |
| 5963 | return 0; |
| 5964 | ext_size = bed->s->sizeof_rel; |
| 5965 | swap_in = bed->s->swap_reloc_in; |
| 5966 | swap_out = bed->s->swap_reloc_out; |
| 5967 | } |
| 5968 | else |
| 5969 | { |
| 5970 | ext_size = bed->s->sizeof_rela; |
| 5971 | swap_in = bed->s->swap_reloca_in; |
| 5972 | swap_out = bed->s->swap_reloca_out; |
| 5973 | } |
| 5974 | count = reldyn->size / ext_size; |
| 5975 | |
| 5976 | size = 0; |
| 5977 | for (lo = reldyn->map_head.link_order; lo != NULL; lo = lo->next) |
| 5978 | if (lo->type == bfd_indirect_link_order) |
| 5979 | { |
| 5980 | asection *o = lo->u.indirect.section; |
| 5981 | size += o->size; |
| 5982 | } |
| 5983 | |
| 5984 | if (size != reldyn->size) |
| 5985 | return 0; |
| 5986 | |
| 5987 | sort_elt = (sizeof (struct elf_link_sort_rela) |
| 5988 | + (i2e - 1) * sizeof (Elf_Internal_Rela)); |
| 5989 | sort = bfd_zmalloc (sort_elt * count); |
| 5990 | if (sort == NULL) |
| 5991 | { |
| 5992 | (*info->callbacks->warning) |
| 5993 | (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0); |
| 5994 | return 0; |
| 5995 | } |
| 5996 | |
| 5997 | if (bed->s->arch_size == 32) |
| 5998 | r_sym_mask = ~(bfd_vma) 0xff; |
| 5999 | else |
| 6000 | r_sym_mask = ~(bfd_vma) 0xffffffff; |
| 6001 | |
| 6002 | for (lo = reldyn->map_head.link_order; lo != NULL; lo = lo->next) |
| 6003 | if (lo->type == bfd_indirect_link_order) |
| 6004 | { |
| 6005 | bfd_byte *erel, *erelend; |
| 6006 | asection *o = lo->u.indirect.section; |
| 6007 | |
| 6008 | if (o->contents == NULL && o->size != 0) |
| 6009 | { |
| 6010 | /* This is a reloc section that is being handled as a normal |
| 6011 | section. See bfd_section_from_shdr. We can't combine |
| 6012 | relocs in this case. */ |
| 6013 | free (sort); |
| 6014 | return 0; |
| 6015 | } |
| 6016 | erel = o->contents; |
| 6017 | erelend = o->contents + o->size; |
| 6018 | p = sort + o->output_offset / ext_size * sort_elt; |
| 6019 | while (erel < erelend) |
| 6020 | { |
| 6021 | struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p; |
| 6022 | (*swap_in) (abfd, erel, s->rela); |
| 6023 | s->type = (*bed->elf_backend_reloc_type_class) (s->rela); |
| 6024 | s->u.sym_mask = r_sym_mask; |
| 6025 | p += sort_elt; |
| 6026 | erel += ext_size; |
| 6027 | } |
| 6028 | } |
| 6029 | |
| 6030 | qsort (sort, count, sort_elt, elf_link_sort_cmp1); |
| 6031 | |
| 6032 | for (i = 0, p = sort; i < count; i++, p += sort_elt) |
| 6033 | { |
| 6034 | struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p; |
| 6035 | if (s->type != reloc_class_relative) |
| 6036 | break; |
| 6037 | } |
| 6038 | ret = i; |
| 6039 | s_non_relative = p; |
| 6040 | |
| 6041 | sq = (struct elf_link_sort_rela *) s_non_relative; |
| 6042 | for (; i < count; i++, p += sort_elt) |
| 6043 | { |
| 6044 | struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p; |
| 6045 | if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0) |
| 6046 | sq = sp; |
| 6047 | sp->u.offset = sq->rela->r_offset; |
| 6048 | } |
| 6049 | |
| 6050 | qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2); |
| 6051 | |
| 6052 | for (lo = reldyn->map_head.link_order; lo != NULL; lo = lo->next) |
| 6053 | if (lo->type == bfd_indirect_link_order) |
| 6054 | { |
| 6055 | bfd_byte *erel, *erelend; |
| 6056 | asection *o = lo->u.indirect.section; |
| 6057 | |
| 6058 | erel = o->contents; |
| 6059 | erelend = o->contents + o->size; |
| 6060 | p = sort + o->output_offset / ext_size * sort_elt; |
| 6061 | while (erel < erelend) |
| 6062 | { |
| 6063 | struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p; |
| 6064 | (*swap_out) (abfd, s->rela, erel); |
| 6065 | p += sort_elt; |
| 6066 | erel += ext_size; |
| 6067 | } |
| 6068 | } |
| 6069 | |
| 6070 | free (sort); |
| 6071 | *psec = reldyn; |
| 6072 | return ret; |
| 6073 | } |
| 6074 | |
| 6075 | /* Flush the output symbols to the file. */ |
| 6076 | |
| 6077 | static bfd_boolean |
| 6078 | elf_link_flush_output_syms (struct elf_final_link_info *finfo, |
| 6079 | const struct elf_backend_data *bed) |
| 6080 | { |
| 6081 | if (finfo->symbuf_count > 0) |
| 6082 | { |
| 6083 | Elf_Internal_Shdr *hdr; |
| 6084 | file_ptr pos; |
| 6085 | bfd_size_type amt; |
| 6086 | |
| 6087 | hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr; |
| 6088 | pos = hdr->sh_offset + hdr->sh_size; |
| 6089 | amt = finfo->symbuf_count * bed->s->sizeof_sym; |
| 6090 | if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0 |
| 6091 | || bfd_bwrite (finfo->symbuf, amt, finfo->output_bfd) != amt) |
| 6092 | return FALSE; |
| 6093 | |
| 6094 | hdr->sh_size += amt; |
| 6095 | finfo->symbuf_count = 0; |
| 6096 | } |
| 6097 | |
| 6098 | return TRUE; |
| 6099 | } |
| 6100 | |
| 6101 | /* Add a symbol to the output symbol table. */ |
| 6102 | |
| 6103 | static bfd_boolean |
| 6104 | elf_link_output_sym (struct elf_final_link_info *finfo, |
| 6105 | const char *name, |
| 6106 | Elf_Internal_Sym *elfsym, |
| 6107 | asection *input_sec, |
| 6108 | struct elf_link_hash_entry *h) |
| 6109 | { |
| 6110 | bfd_byte *dest; |
| 6111 | Elf_External_Sym_Shndx *destshndx; |
| 6112 | bfd_boolean (*output_symbol_hook) |
| 6113 | (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *, |
| 6114 | struct elf_link_hash_entry *); |
| 6115 | const struct elf_backend_data *bed; |
| 6116 | |
| 6117 | bed = get_elf_backend_data (finfo->output_bfd); |
| 6118 | output_symbol_hook = bed->elf_backend_link_output_symbol_hook; |
| 6119 | if (output_symbol_hook != NULL) |
| 6120 | { |
| 6121 | if (! (*output_symbol_hook) (finfo->info, name, elfsym, input_sec, h)) |
| 6122 | return FALSE; |
| 6123 | } |
| 6124 | |
| 6125 | if (name == NULL || *name == '\0') |
| 6126 | elfsym->st_name = 0; |
| 6127 | else if (input_sec->flags & SEC_EXCLUDE) |
| 6128 | elfsym->st_name = 0; |
| 6129 | else |
| 6130 | { |
| 6131 | elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab, |
| 6132 | name, TRUE, FALSE); |
| 6133 | if (elfsym->st_name == (unsigned long) -1) |
| 6134 | return FALSE; |
| 6135 | } |
| 6136 | |
| 6137 | if (finfo->symbuf_count >= finfo->symbuf_size) |
| 6138 | { |
| 6139 | if (! elf_link_flush_output_syms (finfo, bed)) |
| 6140 | return FALSE; |
| 6141 | } |
| 6142 | |
| 6143 | dest = finfo->symbuf + finfo->symbuf_count * bed->s->sizeof_sym; |
| 6144 | destshndx = finfo->symshndxbuf; |
| 6145 | if (destshndx != NULL) |
| 6146 | { |
| 6147 | if (bfd_get_symcount (finfo->output_bfd) >= finfo->shndxbuf_size) |
| 6148 | { |
| 6149 | bfd_size_type amt; |
| 6150 | |
| 6151 | amt = finfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx); |
| 6152 | finfo->symshndxbuf = destshndx = bfd_realloc (destshndx, amt * 2); |
| 6153 | if (destshndx == NULL) |
| 6154 | return FALSE; |
| 6155 | memset ((char *) destshndx + amt, 0, amt); |
| 6156 | finfo->shndxbuf_size *= 2; |
| 6157 | } |
| 6158 | destshndx += bfd_get_symcount (finfo->output_bfd); |
| 6159 | } |
| 6160 | |
| 6161 | bed->s->swap_symbol_out (finfo->output_bfd, elfsym, dest, destshndx); |
| 6162 | finfo->symbuf_count += 1; |
| 6163 | bfd_get_symcount (finfo->output_bfd) += 1; |
| 6164 | |
| 6165 | return TRUE; |
| 6166 | } |
| 6167 | |
| 6168 | /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in |
| 6169 | allowing an unsatisfied unversioned symbol in the DSO to match a |
| 6170 | versioned symbol that would normally require an explicit version. |
| 6171 | We also handle the case that a DSO references a hidden symbol |
| 6172 | which may be satisfied by a versioned symbol in another DSO. */ |
| 6173 | |
| 6174 | static bfd_boolean |
| 6175 | elf_link_check_versioned_symbol (struct bfd_link_info *info, |
| 6176 | const struct elf_backend_data *bed, |
| 6177 | struct elf_link_hash_entry *h) |
| 6178 | { |
| 6179 | bfd *abfd; |
| 6180 | struct elf_link_loaded_list *loaded; |
| 6181 | |
| 6182 | if (!is_elf_hash_table (info->hash)) |
| 6183 | return FALSE; |
| 6184 | |
| 6185 | switch (h->root.type) |
| 6186 | { |
| 6187 | default: |
| 6188 | abfd = NULL; |
| 6189 | break; |
| 6190 | |
| 6191 | case bfd_link_hash_undefined: |
| 6192 | case bfd_link_hash_undefweak: |
| 6193 | abfd = h->root.u.undef.abfd; |
| 6194 | if ((abfd->flags & DYNAMIC) == 0 |
| 6195 | || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0) |
| 6196 | return FALSE; |
| 6197 | break; |
| 6198 | |
| 6199 | case bfd_link_hash_defined: |
| 6200 | case bfd_link_hash_defweak: |
| 6201 | abfd = h->root.u.def.section->owner; |
| 6202 | break; |
| 6203 | |
| 6204 | case bfd_link_hash_common: |
| 6205 | abfd = h->root.u.c.p->section->owner; |
| 6206 | break; |
| 6207 | } |
| 6208 | BFD_ASSERT (abfd != NULL); |
| 6209 | |
| 6210 | for (loaded = elf_hash_table (info)->loaded; |
| 6211 | loaded != NULL; |
| 6212 | loaded = loaded->next) |
| 6213 | { |
| 6214 | bfd *input; |
| 6215 | Elf_Internal_Shdr *hdr; |
| 6216 | bfd_size_type symcount; |
| 6217 | bfd_size_type extsymcount; |
| 6218 | bfd_size_type extsymoff; |
| 6219 | Elf_Internal_Shdr *versymhdr; |
| 6220 | Elf_Internal_Sym *isym; |
| 6221 | Elf_Internal_Sym *isymend; |
| 6222 | Elf_Internal_Sym *isymbuf; |
| 6223 | Elf_External_Versym *ever; |
| 6224 | Elf_External_Versym *extversym; |
| 6225 | |
| 6226 | input = loaded->abfd; |
| 6227 | |
| 6228 | /* We check each DSO for a possible hidden versioned definition. */ |
| 6229 | if (input == abfd |
| 6230 | || (input->flags & DYNAMIC) == 0 |
| 6231 | || elf_dynversym (input) == 0) |
| 6232 | continue; |
| 6233 | |
| 6234 | hdr = &elf_tdata (input)->dynsymtab_hdr; |
| 6235 | |
| 6236 | symcount = hdr->sh_size / bed->s->sizeof_sym; |
| 6237 | if (elf_bad_symtab (input)) |
| 6238 | { |
| 6239 | extsymcount = symcount; |
| 6240 | extsymoff = 0; |
| 6241 | } |
| 6242 | else |
| 6243 | { |
| 6244 | extsymcount = symcount - hdr->sh_info; |
| 6245 | extsymoff = hdr->sh_info; |
| 6246 | } |
| 6247 | |
| 6248 | if (extsymcount == 0) |
| 6249 | continue; |
| 6250 | |
| 6251 | isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff, |
| 6252 | NULL, NULL, NULL); |
| 6253 | if (isymbuf == NULL) |
| 6254 | return FALSE; |
| 6255 | |
| 6256 | /* Read in any version definitions. */ |
| 6257 | versymhdr = &elf_tdata (input)->dynversym_hdr; |
| 6258 | extversym = bfd_malloc (versymhdr->sh_size); |
| 6259 | if (extversym == NULL) |
| 6260 | goto error_ret; |
| 6261 | |
| 6262 | if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0 |
| 6263 | || (bfd_bread (extversym, versymhdr->sh_size, input) |
| 6264 | != versymhdr->sh_size)) |
| 6265 | { |
| 6266 | free (extversym); |
| 6267 | error_ret: |
| 6268 | free (isymbuf); |
| 6269 | return FALSE; |
| 6270 | } |
| 6271 | |
| 6272 | ever = extversym + extsymoff; |
| 6273 | isymend = isymbuf + extsymcount; |
| 6274 | for (isym = isymbuf; isym < isymend; isym++, ever++) |
| 6275 | { |
| 6276 | const char *name; |
| 6277 | Elf_Internal_Versym iver; |
| 6278 | unsigned short version_index; |
| 6279 | |
| 6280 | if (ELF_ST_BIND (isym->st_info) == STB_LOCAL |
| 6281 | || isym->st_shndx == SHN_UNDEF) |
| 6282 | continue; |
| 6283 | |
| 6284 | name = bfd_elf_string_from_elf_section (input, |
| 6285 | hdr->sh_link, |
| 6286 | isym->st_name); |
| 6287 | if (strcmp (name, h->root.root.string) != 0) |
| 6288 | continue; |
| 6289 | |
| 6290 | _bfd_elf_swap_versym_in (input, ever, &iver); |
| 6291 | |
| 6292 | if ((iver.vs_vers & VERSYM_HIDDEN) == 0) |
| 6293 | { |
| 6294 | /* If we have a non-hidden versioned sym, then it should |
| 6295 | have provided a definition for the undefined sym. */ |
| 6296 | abort (); |
| 6297 | } |
| 6298 | |
| 6299 | version_index = iver.vs_vers & VERSYM_VERSION; |
| 6300 | if (version_index == 1 || version_index == 2) |
| 6301 | { |
| 6302 | /* This is the base or first version. We can use it. */ |
| 6303 | free (extversym); |
| 6304 | free (isymbuf); |
| 6305 | return TRUE; |
| 6306 | } |
| 6307 | } |
| 6308 | |
| 6309 | free (extversym); |
| 6310 | free (isymbuf); |
| 6311 | } |
| 6312 | |
| 6313 | return FALSE; |
| 6314 | } |
| 6315 | |
| 6316 | /* Add an external symbol to the symbol table. This is called from |
| 6317 | the hash table traversal routine. When generating a shared object, |
| 6318 | we go through the symbol table twice. The first time we output |
| 6319 | anything that might have been forced to local scope in a version |
| 6320 | script. The second time we output the symbols that are still |
| 6321 | global symbols. */ |
| 6322 | |
| 6323 | static bfd_boolean |
| 6324 | elf_link_output_extsym (struct elf_link_hash_entry *h, void *data) |
| 6325 | { |
| 6326 | struct elf_outext_info *eoinfo = data; |
| 6327 | struct elf_final_link_info *finfo = eoinfo->finfo; |
| 6328 | bfd_boolean strip; |
| 6329 | Elf_Internal_Sym sym; |
| 6330 | asection *input_sec; |
| 6331 | const struct elf_backend_data *bed; |
| 6332 | |
| 6333 | if (h->root.type == bfd_link_hash_warning) |
| 6334 | { |
| 6335 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 6336 | if (h->root.type == bfd_link_hash_new) |
| 6337 | return TRUE; |
| 6338 | } |
| 6339 | |
| 6340 | /* Decide whether to output this symbol in this pass. */ |
| 6341 | if (eoinfo->localsyms) |
| 6342 | { |
| 6343 | if (!h->forced_local) |
| 6344 | return TRUE; |
| 6345 | } |
| 6346 | else |
| 6347 | { |
| 6348 | if (h->forced_local) |
| 6349 | return TRUE; |
| 6350 | } |
| 6351 | |
| 6352 | bed = get_elf_backend_data (finfo->output_bfd); |
| 6353 | |
| 6354 | /* If we have an undefined symbol reference here then it must have |
| 6355 | come from a shared library that is being linked in. (Undefined |
| 6356 | references in regular files have already been handled). If we |
| 6357 | are reporting errors for this situation then do so now. */ |
| 6358 | if (h->root.type == bfd_link_hash_undefined |
| 6359 | && h->ref_dynamic |
| 6360 | && !h->ref_regular |
| 6361 | && ! elf_link_check_versioned_symbol (finfo->info, bed, h) |
| 6362 | && finfo->info->unresolved_syms_in_shared_libs != RM_IGNORE) |
| 6363 | { |
| 6364 | if (! ((*finfo->info->callbacks->undefined_symbol) |
| 6365 | (finfo->info, h->root.root.string, h->root.u.undef.abfd, |
| 6366 | NULL, 0, finfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR))) |
| 6367 | { |
| 6368 | eoinfo->failed = TRUE; |
| 6369 | return FALSE; |
| 6370 | } |
| 6371 | } |
| 6372 | |
| 6373 | /* We should also warn if a forced local symbol is referenced from |
| 6374 | shared libraries. */ |
| 6375 | if (! finfo->info->relocatable |
| 6376 | && (! finfo->info->shared) |
| 6377 | && h->forced_local |
| 6378 | && h->ref_dynamic |
| 6379 | && !h->dynamic_def |
| 6380 | && !h->dynamic_weak |
| 6381 | && ! elf_link_check_versioned_symbol (finfo->info, bed, h)) |
| 6382 | { |
| 6383 | (*_bfd_error_handler) |
| 6384 | (_("%B: %s symbol `%s' in %B is referenced by DSO"), |
| 6385 | finfo->output_bfd, |
| 6386 | h->root.u.def.section == bfd_abs_section_ptr |
| 6387 | ? finfo->output_bfd : h->root.u.def.section->owner, |
| 6388 | ELF_ST_VISIBILITY (h->other) == STV_INTERNAL |
| 6389 | ? "internal" |
| 6390 | : ELF_ST_VISIBILITY (h->other) == STV_HIDDEN |
| 6391 | ? "hidden" : "local", |
| 6392 | h->root.root.string); |
| 6393 | eoinfo->failed = TRUE; |
| 6394 | return FALSE; |
| 6395 | } |
| 6396 | |
| 6397 | /* We don't want to output symbols that have never been mentioned by |
| 6398 | a regular file, or that we have been told to strip. However, if |
| 6399 | h->indx is set to -2, the symbol is used by a reloc and we must |
| 6400 | output it. */ |
| 6401 | if (h->indx == -2) |
| 6402 | strip = FALSE; |
| 6403 | else if ((h->def_dynamic |
| 6404 | || h->ref_dynamic |
| 6405 | || h->root.type == bfd_link_hash_new) |
| 6406 | && !h->def_regular |
| 6407 | && !h->ref_regular) |
| 6408 | strip = TRUE; |
| 6409 | else if (finfo->info->strip == strip_all) |
| 6410 | strip = TRUE; |
| 6411 | else if (finfo->info->strip == strip_some |
| 6412 | && bfd_hash_lookup (finfo->info->keep_hash, |
| 6413 | h->root.root.string, FALSE, FALSE) == NULL) |
| 6414 | strip = TRUE; |
| 6415 | else if (finfo->info->strip_discarded |
| 6416 | && (h->root.type == bfd_link_hash_defined |
| 6417 | || h->root.type == bfd_link_hash_defweak) |
| 6418 | && elf_discarded_section (h->root.u.def.section)) |
| 6419 | strip = TRUE; |
| 6420 | else |
| 6421 | strip = FALSE; |
| 6422 | |
| 6423 | /* If we're stripping it, and it's not a dynamic symbol, there's |
| 6424 | nothing else to do unless it is a forced local symbol. */ |
| 6425 | if (strip |
| 6426 | && h->dynindx == -1 |
| 6427 | && !h->forced_local) |
| 6428 | return TRUE; |
| 6429 | |
| 6430 | sym.st_value = 0; |
| 6431 | sym.st_size = h->size; |
| 6432 | sym.st_other = h->other; |
| 6433 | if (h->forced_local) |
| 6434 | sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type); |
| 6435 | else if (h->root.type == bfd_link_hash_undefweak |
| 6436 | || h->root.type == bfd_link_hash_defweak) |
| 6437 | sym.st_info = ELF_ST_INFO (STB_WEAK, h->type); |
| 6438 | else |
| 6439 | sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type); |
| 6440 | |
| 6441 | switch (h->root.type) |
| 6442 | { |
| 6443 | default: |
| 6444 | case bfd_link_hash_new: |
| 6445 | case bfd_link_hash_warning: |
| 6446 | abort (); |
| 6447 | return FALSE; |
| 6448 | |
| 6449 | case bfd_link_hash_undefined: |
| 6450 | case bfd_link_hash_undefweak: |
| 6451 | input_sec = bfd_und_section_ptr; |
| 6452 | sym.st_shndx = SHN_UNDEF; |
| 6453 | break; |
| 6454 | |
| 6455 | case bfd_link_hash_defined: |
| 6456 | case bfd_link_hash_defweak: |
| 6457 | { |
| 6458 | input_sec = h->root.u.def.section; |
| 6459 | if (input_sec->output_section != NULL) |
| 6460 | { |
| 6461 | sym.st_shndx = |
| 6462 | _bfd_elf_section_from_bfd_section (finfo->output_bfd, |
| 6463 | input_sec->output_section); |
| 6464 | if (sym.st_shndx == SHN_BAD) |
| 6465 | { |
| 6466 | (*_bfd_error_handler) |
| 6467 | (_("%B: could not find output section %A for input section %A"), |
| 6468 | finfo->output_bfd, input_sec->output_section, input_sec); |
| 6469 | eoinfo->failed = TRUE; |
| 6470 | return FALSE; |
| 6471 | } |
| 6472 | |
| 6473 | /* ELF symbols in relocatable files are section relative, |
| 6474 | but in nonrelocatable files they are virtual |
| 6475 | addresses. */ |
| 6476 | sym.st_value = h->root.u.def.value + input_sec->output_offset; |
| 6477 | if (! finfo->info->relocatable) |
| 6478 | { |
| 6479 | sym.st_value += input_sec->output_section->vma; |
| 6480 | if (h->type == STT_TLS) |
| 6481 | { |
| 6482 | /* STT_TLS symbols are relative to PT_TLS segment |
| 6483 | base. */ |
| 6484 | BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL); |
| 6485 | sym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma; |
| 6486 | } |
| 6487 | } |
| 6488 | } |
| 6489 | else |
| 6490 | { |
| 6491 | BFD_ASSERT (input_sec->owner == NULL |
| 6492 | || (input_sec->owner->flags & DYNAMIC) != 0); |
| 6493 | sym.st_shndx = SHN_UNDEF; |
| 6494 | input_sec = bfd_und_section_ptr; |
| 6495 | } |
| 6496 | } |
| 6497 | break; |
| 6498 | |
| 6499 | case bfd_link_hash_common: |
| 6500 | input_sec = h->root.u.c.p->section; |
| 6501 | sym.st_shndx = SHN_COMMON; |
| 6502 | sym.st_value = 1 << h->root.u.c.p->alignment_power; |
| 6503 | break; |
| 6504 | |
| 6505 | case bfd_link_hash_indirect: |
| 6506 | /* These symbols are created by symbol versioning. They point |
| 6507 | to the decorated version of the name. For example, if the |
| 6508 | symbol foo@@GNU_1.2 is the default, which should be used when |
| 6509 | foo is used with no version, then we add an indirect symbol |
| 6510 | foo which points to foo@@GNU_1.2. We ignore these symbols, |
| 6511 | since the indirected symbol is already in the hash table. */ |
| 6512 | return TRUE; |
| 6513 | } |
| 6514 | |
| 6515 | /* Give the processor backend a chance to tweak the symbol value, |
| 6516 | and also to finish up anything that needs to be done for this |
| 6517 | symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for |
| 6518 | forced local syms when non-shared is due to a historical quirk. */ |
| 6519 | if ((h->dynindx != -1 |
| 6520 | || h->forced_local) |
| 6521 | && ((finfo->info->shared |
| 6522 | && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 6523 | || h->root.type != bfd_link_hash_undefweak)) |
| 6524 | || !h->forced_local) |
| 6525 | && elf_hash_table (finfo->info)->dynamic_sections_created) |
| 6526 | { |
| 6527 | if (! ((*bed->elf_backend_finish_dynamic_symbol) |
| 6528 | (finfo->output_bfd, finfo->info, h, &sym))) |
| 6529 | { |
| 6530 | eoinfo->failed = TRUE; |
| 6531 | return FALSE; |
| 6532 | } |
| 6533 | } |
| 6534 | |
| 6535 | /* If we are marking the symbol as undefined, and there are no |
| 6536 | non-weak references to this symbol from a regular object, then |
| 6537 | mark the symbol as weak undefined; if there are non-weak |
| 6538 | references, mark the symbol as strong. We can't do this earlier, |
| 6539 | because it might not be marked as undefined until the |
| 6540 | finish_dynamic_symbol routine gets through with it. */ |
| 6541 | if (sym.st_shndx == SHN_UNDEF |
| 6542 | && h->ref_regular |
| 6543 | && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL |
| 6544 | || ELF_ST_BIND (sym.st_info) == STB_WEAK)) |
| 6545 | { |
| 6546 | int bindtype; |
| 6547 | |
| 6548 | if (h->ref_regular_nonweak) |
| 6549 | bindtype = STB_GLOBAL; |
| 6550 | else |
| 6551 | bindtype = STB_WEAK; |
| 6552 | sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info)); |
| 6553 | } |
| 6554 | |
| 6555 | /* If a non-weak symbol with non-default visibility is not defined |
| 6556 | locally, it is a fatal error. */ |
| 6557 | if (! finfo->info->relocatable |
| 6558 | && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT |
| 6559 | && ELF_ST_BIND (sym.st_info) != STB_WEAK |
| 6560 | && h->root.type == bfd_link_hash_undefined |
| 6561 | && !h->def_regular) |
| 6562 | { |
| 6563 | (*_bfd_error_handler) |
| 6564 | (_("%B: %s symbol `%s' isn't defined"), |
| 6565 | finfo->output_bfd, |
| 6566 | ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED |
| 6567 | ? "protected" |
| 6568 | : ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL |
| 6569 | ? "internal" : "hidden", |
| 6570 | h->root.root.string); |
| 6571 | eoinfo->failed = TRUE; |
| 6572 | return FALSE; |
| 6573 | } |
| 6574 | |
| 6575 | /* If this symbol should be put in the .dynsym section, then put it |
| 6576 | there now. We already know the symbol index. We also fill in |
| 6577 | the entry in the .hash section. */ |
| 6578 | if (h->dynindx != -1 |
| 6579 | && elf_hash_table (finfo->info)->dynamic_sections_created) |
| 6580 | { |
| 6581 | size_t bucketcount; |
| 6582 | size_t bucket; |
| 6583 | size_t hash_entry_size; |
| 6584 | bfd_byte *bucketpos; |
| 6585 | bfd_vma chain; |
| 6586 | bfd_byte *esym; |
| 6587 | |
| 6588 | sym.st_name = h->dynstr_index; |
| 6589 | esym = finfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym; |
| 6590 | bed->s->swap_symbol_out (finfo->output_bfd, &sym, esym, 0); |
| 6591 | |
| 6592 | bucketcount = elf_hash_table (finfo->info)->bucketcount; |
| 6593 | bucket = h->u.elf_hash_value % bucketcount; |
| 6594 | hash_entry_size |
| 6595 | = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize; |
| 6596 | bucketpos = ((bfd_byte *) finfo->hash_sec->contents |
| 6597 | + (bucket + 2) * hash_entry_size); |
| 6598 | chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos); |
| 6599 | bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos); |
| 6600 | bfd_put (8 * hash_entry_size, finfo->output_bfd, chain, |
| 6601 | ((bfd_byte *) finfo->hash_sec->contents |
| 6602 | + (bucketcount + 2 + h->dynindx) * hash_entry_size)); |
| 6603 | |
| 6604 | if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL) |
| 6605 | { |
| 6606 | Elf_Internal_Versym iversym; |
| 6607 | Elf_External_Versym *eversym; |
| 6608 | |
| 6609 | if (!h->def_regular) |
| 6610 | { |
| 6611 | if (h->verinfo.verdef == NULL) |
| 6612 | iversym.vs_vers = 0; |
| 6613 | else |
| 6614 | iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1; |
| 6615 | } |
| 6616 | else |
| 6617 | { |
| 6618 | if (h->verinfo.vertree == NULL) |
| 6619 | iversym.vs_vers = 1; |
| 6620 | else |
| 6621 | iversym.vs_vers = h->verinfo.vertree->vernum + 1; |
| 6622 | if (finfo->info->create_default_symver) |
| 6623 | iversym.vs_vers++; |
| 6624 | } |
| 6625 | |
| 6626 | if (h->hidden) |
| 6627 | iversym.vs_vers |= VERSYM_HIDDEN; |
| 6628 | |
| 6629 | eversym = (Elf_External_Versym *) finfo->symver_sec->contents; |
| 6630 | eversym += h->dynindx; |
| 6631 | _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym); |
| 6632 | } |
| 6633 | } |
| 6634 | |
| 6635 | /* If we're stripping it, then it was just a dynamic symbol, and |
| 6636 | there's nothing else to do. */ |
| 6637 | if (strip || (input_sec->flags & SEC_EXCLUDE) != 0) |
| 6638 | return TRUE; |
| 6639 | |
| 6640 | h->indx = bfd_get_symcount (finfo->output_bfd); |
| 6641 | |
| 6642 | if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec, h)) |
| 6643 | { |
| 6644 | eoinfo->failed = TRUE; |
| 6645 | return FALSE; |
| 6646 | } |
| 6647 | |
| 6648 | return TRUE; |
| 6649 | } |
| 6650 | |
| 6651 | /* Return TRUE if special handling is done for relocs in SEC against |
| 6652 | symbols defined in discarded sections. */ |
| 6653 | |
| 6654 | static bfd_boolean |
| 6655 | elf_section_ignore_discarded_relocs (asection *sec) |
| 6656 | { |
| 6657 | const struct elf_backend_data *bed; |
| 6658 | |
| 6659 | switch (sec->sec_info_type) |
| 6660 | { |
| 6661 | case ELF_INFO_TYPE_STABS: |
| 6662 | case ELF_INFO_TYPE_EH_FRAME: |
| 6663 | return TRUE; |
| 6664 | default: |
| 6665 | break; |
| 6666 | } |
| 6667 | |
| 6668 | bed = get_elf_backend_data (sec->owner); |
| 6669 | if (bed->elf_backend_ignore_discarded_relocs != NULL |
| 6670 | && (*bed->elf_backend_ignore_discarded_relocs) (sec)) |
| 6671 | return TRUE; |
| 6672 | |
| 6673 | return FALSE; |
| 6674 | } |
| 6675 | |
| 6676 | enum action_discarded |
| 6677 | { |
| 6678 | COMPLAIN = 1, |
| 6679 | PRETEND = 2 |
| 6680 | }; |
| 6681 | |
| 6682 | /* Return a mask saying how ld should treat relocations in SEC against |
| 6683 | symbols defined in discarded sections. If this function returns |
| 6684 | COMPLAIN set, ld will issue a warning message. If this function |
| 6685 | returns PRETEND set, and the discarded section was link-once and the |
| 6686 | same size as the kept link-once section, ld will pretend that the |
| 6687 | symbol was actually defined in the kept section. Otherwise ld will |
| 6688 | zero the reloc (at least that is the intent, but some cooperation by |
| 6689 | the target dependent code is needed, particularly for REL targets). */ |
| 6690 | |
| 6691 | static unsigned int |
| 6692 | elf_action_discarded (asection *sec) |
| 6693 | { |
| 6694 | if (sec->flags & SEC_DEBUGGING) |
| 6695 | return PRETEND; |
| 6696 | |
| 6697 | if (strcmp (".eh_frame", sec->name) == 0) |
| 6698 | return 0; |
| 6699 | |
| 6700 | if (strcmp (".gcc_except_table", sec->name) == 0) |
| 6701 | return 0; |
| 6702 | |
| 6703 | if (strcmp (".PARISC.unwind", sec->name) == 0) |
| 6704 | return 0; |
| 6705 | |
| 6706 | if (strcmp (".fixup", sec->name) == 0) |
| 6707 | return 0; |
| 6708 | |
| 6709 | return COMPLAIN | PRETEND; |
| 6710 | } |
| 6711 | |
| 6712 | /* Find a match between a section and a member of a section group. */ |
| 6713 | |
| 6714 | static asection * |
| 6715 | match_group_member (asection *sec, asection *group) |
| 6716 | { |
| 6717 | asection *first = elf_next_in_group (group); |
| 6718 | asection *s = first; |
| 6719 | |
| 6720 | while (s != NULL) |
| 6721 | { |
| 6722 | if (bfd_elf_match_symbols_in_sections (s, sec)) |
| 6723 | return s; |
| 6724 | |
| 6725 | if (s == first) |
| 6726 | break; |
| 6727 | } |
| 6728 | |
| 6729 | return NULL; |
| 6730 | } |
| 6731 | |
| 6732 | /* Check if the kept section of a discarded section SEC can be used |
| 6733 | to replace it. Return the replacement if it is OK. Otherwise return |
| 6734 | NULL. */ |
| 6735 | |
| 6736 | asection * |
| 6737 | _bfd_elf_check_kept_section (asection *sec) |
| 6738 | { |
| 6739 | asection *kept; |
| 6740 | |
| 6741 | kept = sec->kept_section; |
| 6742 | if (kept != NULL) |
| 6743 | { |
| 6744 | if (elf_sec_group (sec) != NULL) |
| 6745 | kept = match_group_member (sec, kept); |
| 6746 | if (kept != NULL && sec->size != kept->size) |
| 6747 | kept = NULL; |
| 6748 | } |
| 6749 | return kept; |
| 6750 | } |
| 6751 | |
| 6752 | /* Link an input file into the linker output file. This function |
| 6753 | handles all the sections and relocations of the input file at once. |
| 6754 | This is so that we only have to read the local symbols once, and |
| 6755 | don't have to keep them in memory. */ |
| 6756 | |
| 6757 | static bfd_boolean |
| 6758 | elf_link_input_bfd (struct elf_final_link_info *finfo, bfd *input_bfd) |
| 6759 | { |
| 6760 | bfd_boolean (*relocate_section) |
| 6761 | (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 6762 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **); |
| 6763 | bfd *output_bfd; |
| 6764 | Elf_Internal_Shdr *symtab_hdr; |
| 6765 | size_t locsymcount; |
| 6766 | size_t extsymoff; |
| 6767 | Elf_Internal_Sym *isymbuf; |
| 6768 | Elf_Internal_Sym *isym; |
| 6769 | Elf_Internal_Sym *isymend; |
| 6770 | long *pindex; |
| 6771 | asection **ppsection; |
| 6772 | asection *o; |
| 6773 | const struct elf_backend_data *bed; |
| 6774 | bfd_boolean emit_relocs; |
| 6775 | struct elf_link_hash_entry **sym_hashes; |
| 6776 | |
| 6777 | output_bfd = finfo->output_bfd; |
| 6778 | bed = get_elf_backend_data (output_bfd); |
| 6779 | relocate_section = bed->elf_backend_relocate_section; |
| 6780 | |
| 6781 | /* If this is a dynamic object, we don't want to do anything here: |
| 6782 | we don't want the local symbols, and we don't want the section |
| 6783 | contents. */ |
| 6784 | if ((input_bfd->flags & DYNAMIC) != 0) |
| 6785 | return TRUE; |
| 6786 | |
| 6787 | emit_relocs = (finfo->info->relocatable |
| 6788 | || finfo->info->emitrelocations); |
| 6789 | |
| 6790 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 6791 | if (elf_bad_symtab (input_bfd)) |
| 6792 | { |
| 6793 | locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym; |
| 6794 | extsymoff = 0; |
| 6795 | } |
| 6796 | else |
| 6797 | { |
| 6798 | locsymcount = symtab_hdr->sh_info; |
| 6799 | extsymoff = symtab_hdr->sh_info; |
| 6800 | } |
| 6801 | |
| 6802 | /* Read the local symbols. */ |
| 6803 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 6804 | if (isymbuf == NULL && locsymcount != 0) |
| 6805 | { |
| 6806 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0, |
| 6807 | finfo->internal_syms, |
| 6808 | finfo->external_syms, |
| 6809 | finfo->locsym_shndx); |
| 6810 | if (isymbuf == NULL) |
| 6811 | return FALSE; |
| 6812 | } |
| 6813 | |
| 6814 | /* Find local symbol sections and adjust values of symbols in |
| 6815 | SEC_MERGE sections. Write out those local symbols we know are |
| 6816 | going into the output file. */ |
| 6817 | isymend = isymbuf + locsymcount; |
| 6818 | for (isym = isymbuf, pindex = finfo->indices, ppsection = finfo->sections; |
| 6819 | isym < isymend; |
| 6820 | isym++, pindex++, ppsection++) |
| 6821 | { |
| 6822 | asection *isec; |
| 6823 | const char *name; |
| 6824 | Elf_Internal_Sym osym; |
| 6825 | |
| 6826 | *pindex = -1; |
| 6827 | |
| 6828 | if (elf_bad_symtab (input_bfd)) |
| 6829 | { |
| 6830 | if (ELF_ST_BIND (isym->st_info) != STB_LOCAL) |
| 6831 | { |
| 6832 | *ppsection = NULL; |
| 6833 | continue; |
| 6834 | } |
| 6835 | } |
| 6836 | |
| 6837 | if (isym->st_shndx == SHN_UNDEF) |
| 6838 | isec = bfd_und_section_ptr; |
| 6839 | else if (isym->st_shndx < SHN_LORESERVE |
| 6840 | || isym->st_shndx > SHN_HIRESERVE) |
| 6841 | { |
| 6842 | isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); |
| 6843 | if (isec |
| 6844 | && isec->sec_info_type == ELF_INFO_TYPE_MERGE |
| 6845 | && ELF_ST_TYPE (isym->st_info) != STT_SECTION) |
| 6846 | isym->st_value = |
| 6847 | _bfd_merged_section_offset (output_bfd, &isec, |
| 6848 | elf_section_data (isec)->sec_info, |
| 6849 | isym->st_value); |
| 6850 | } |
| 6851 | else if (isym->st_shndx == SHN_ABS) |
| 6852 | isec = bfd_abs_section_ptr; |
| 6853 | else if (isym->st_shndx == SHN_COMMON) |
| 6854 | isec = bfd_com_section_ptr; |
| 6855 | else |
| 6856 | { |
| 6857 | /* Who knows? */ |
| 6858 | isec = NULL; |
| 6859 | } |
| 6860 | |
| 6861 | *ppsection = isec; |
| 6862 | |
| 6863 | /* Don't output the first, undefined, symbol. */ |
| 6864 | if (ppsection == finfo->sections) |
| 6865 | continue; |
| 6866 | |
| 6867 | if (ELF_ST_TYPE (isym->st_info) == STT_SECTION) |
| 6868 | { |
| 6869 | /* We never output section symbols. Instead, we use the |
| 6870 | section symbol of the corresponding section in the output |
| 6871 | file. */ |
| 6872 | continue; |
| 6873 | } |
| 6874 | |
| 6875 | /* If we are stripping all symbols, we don't want to output this |
| 6876 | one. */ |
| 6877 | if (finfo->info->strip == strip_all) |
| 6878 | continue; |
| 6879 | |
| 6880 | /* If we are discarding all local symbols, we don't want to |
| 6881 | output this one. If we are generating a relocatable output |
| 6882 | file, then some of the local symbols may be required by |
| 6883 | relocs; we output them below as we discover that they are |
| 6884 | needed. */ |
| 6885 | if (finfo->info->discard == discard_all) |
| 6886 | continue; |
| 6887 | |
| 6888 | /* If this symbol is defined in a section which we are |
| 6889 | discarding, we don't need to keep it, but note that |
| 6890 | linker_mark is only reliable for sections that have contents. |
| 6891 | For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE |
| 6892 | as well as linker_mark. */ |
| 6893 | if ((isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE) |
| 6894 | && (isec == NULL |
| 6895 | || (! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0) |
| 6896 | || (! finfo->info->relocatable |
| 6897 | && (isec->flags & SEC_EXCLUDE) != 0))) |
| 6898 | continue; |
| 6899 | |
| 6900 | /* If the section is not in the output BFD's section list, it is not |
| 6901 | being output. */ |
| 6902 | if (bfd_section_removed_from_list (output_bfd, isec->output_section)) |
| 6903 | continue; |
| 6904 | |
| 6905 | /* Get the name of the symbol. */ |
| 6906 | name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, |
| 6907 | isym->st_name); |
| 6908 | if (name == NULL) |
| 6909 | return FALSE; |
| 6910 | |
| 6911 | /* See if we are discarding symbols with this name. */ |
| 6912 | if ((finfo->info->strip == strip_some |
| 6913 | && (bfd_hash_lookup (finfo->info->keep_hash, name, FALSE, FALSE) |
| 6914 | == NULL)) |
| 6915 | || (((finfo->info->discard == discard_sec_merge |
| 6916 | && (isec->flags & SEC_MERGE) && ! finfo->info->relocatable) |
| 6917 | || finfo->info->discard == discard_l) |
| 6918 | && bfd_is_local_label_name (input_bfd, name))) |
| 6919 | continue; |
| 6920 | |
| 6921 | /* If we get here, we are going to output this symbol. */ |
| 6922 | |
| 6923 | osym = *isym; |
| 6924 | |
| 6925 | /* Adjust the section index for the output file. */ |
| 6926 | osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd, |
| 6927 | isec->output_section); |
| 6928 | if (osym.st_shndx == SHN_BAD) |
| 6929 | return FALSE; |
| 6930 | |
| 6931 | *pindex = bfd_get_symcount (output_bfd); |
| 6932 | |
| 6933 | /* ELF symbols in relocatable files are section relative, but |
| 6934 | in executable files they are virtual addresses. Note that |
| 6935 | this code assumes that all ELF sections have an associated |
| 6936 | BFD section with a reasonable value for output_offset; below |
| 6937 | we assume that they also have a reasonable value for |
| 6938 | output_section. Any special sections must be set up to meet |
| 6939 | these requirements. */ |
| 6940 | osym.st_value += isec->output_offset; |
| 6941 | if (! finfo->info->relocatable) |
| 6942 | { |
| 6943 | osym.st_value += isec->output_section->vma; |
| 6944 | if (ELF_ST_TYPE (osym.st_info) == STT_TLS) |
| 6945 | { |
| 6946 | /* STT_TLS symbols are relative to PT_TLS segment base. */ |
| 6947 | BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL); |
| 6948 | osym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma; |
| 6949 | } |
| 6950 | } |
| 6951 | |
| 6952 | if (! elf_link_output_sym (finfo, name, &osym, isec, NULL)) |
| 6953 | return FALSE; |
| 6954 | } |
| 6955 | |
| 6956 | /* Relocate the contents of each section. */ |
| 6957 | sym_hashes = elf_sym_hashes (input_bfd); |
| 6958 | for (o = input_bfd->sections; o != NULL; o = o->next) |
| 6959 | { |
| 6960 | bfd_byte *contents; |
| 6961 | |
| 6962 | if (! o->linker_mark) |
| 6963 | { |
| 6964 | /* This section was omitted from the link. */ |
| 6965 | continue; |
| 6966 | } |
| 6967 | |
| 6968 | if ((o->flags & SEC_HAS_CONTENTS) == 0 |
| 6969 | || (o->size == 0 && (o->flags & SEC_RELOC) == 0)) |
| 6970 | continue; |
| 6971 | |
| 6972 | if ((o->flags & SEC_LINKER_CREATED) != 0) |
| 6973 | { |
| 6974 | /* Section was created by _bfd_elf_link_create_dynamic_sections |
| 6975 | or somesuch. */ |
| 6976 | continue; |
| 6977 | } |
| 6978 | |
| 6979 | /* Get the contents of the section. They have been cached by a |
| 6980 | relaxation routine. Note that o is a section in an input |
| 6981 | file, so the contents field will not have been set by any of |
| 6982 | the routines which work on output files. */ |
| 6983 | if (elf_section_data (o)->this_hdr.contents != NULL) |
| 6984 | contents = elf_section_data (o)->this_hdr.contents; |
| 6985 | else |
| 6986 | { |
| 6987 | bfd_size_type amt = o->rawsize ? o->rawsize : o->size; |
| 6988 | |
| 6989 | contents = finfo->contents; |
| 6990 | if (! bfd_get_section_contents (input_bfd, o, contents, 0, amt)) |
| 6991 | return FALSE; |
| 6992 | } |
| 6993 | |
| 6994 | if ((o->flags & SEC_RELOC) != 0) |
| 6995 | { |
| 6996 | Elf_Internal_Rela *internal_relocs; |
| 6997 | bfd_vma r_type_mask; |
| 6998 | int r_sym_shift; |
| 6999 | |
| 7000 | /* Get the swapped relocs. */ |
| 7001 | internal_relocs |
| 7002 | = _bfd_elf_link_read_relocs (input_bfd, o, finfo->external_relocs, |
| 7003 | finfo->internal_relocs, FALSE); |
| 7004 | if (internal_relocs == NULL |
| 7005 | && o->reloc_count > 0) |
| 7006 | return FALSE; |
| 7007 | |
| 7008 | if (bed->s->arch_size == 32) |
| 7009 | { |
| 7010 | r_type_mask = 0xff; |
| 7011 | r_sym_shift = 8; |
| 7012 | } |
| 7013 | else |
| 7014 | { |
| 7015 | r_type_mask = 0xffffffff; |
| 7016 | r_sym_shift = 32; |
| 7017 | } |
| 7018 | |
| 7019 | /* Run through the relocs looking for any against symbols |
| 7020 | from discarded sections and section symbols from |
| 7021 | removed link-once sections. Complain about relocs |
| 7022 | against discarded sections. Zero relocs against removed |
| 7023 | link-once sections. Preserve debug information as much |
| 7024 | as we can. */ |
| 7025 | if (!elf_section_ignore_discarded_relocs (o)) |
| 7026 | { |
| 7027 | Elf_Internal_Rela *rel, *relend; |
| 7028 | unsigned int action = elf_action_discarded (o); |
| 7029 | |
| 7030 | rel = internal_relocs; |
| 7031 | relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel; |
| 7032 | for ( ; rel < relend; rel++) |
| 7033 | { |
| 7034 | unsigned long r_symndx = rel->r_info >> r_sym_shift; |
| 7035 | asection **ps, *sec; |
| 7036 | struct elf_link_hash_entry *h = NULL; |
| 7037 | const char *sym_name; |
| 7038 | |
| 7039 | if (r_symndx == STN_UNDEF) |
| 7040 | continue; |
| 7041 | |
| 7042 | if (r_symndx >= locsymcount |
| 7043 | || (elf_bad_symtab (input_bfd) |
| 7044 | && finfo->sections[r_symndx] == NULL)) |
| 7045 | { |
| 7046 | h = sym_hashes[r_symndx - extsymoff]; |
| 7047 | |
| 7048 | /* Badly formatted input files can contain relocs that |
| 7049 | reference non-existant symbols. Check here so that |
| 7050 | we do not seg fault. */ |
| 7051 | if (h == NULL) |
| 7052 | { |
| 7053 | char buffer [32]; |
| 7054 | |
| 7055 | sprintf_vma (buffer, rel->r_info); |
| 7056 | (*_bfd_error_handler) |
| 7057 | (_("error: %B contains a reloc (0x%s) for section %A " |
| 7058 | "that references a non-existent global symbol"), |
| 7059 | input_bfd, o, buffer); |
| 7060 | bfd_set_error (bfd_error_bad_value); |
| 7061 | return FALSE; |
| 7062 | } |
| 7063 | |
| 7064 | while (h->root.type == bfd_link_hash_indirect |
| 7065 | || h->root.type == bfd_link_hash_warning) |
| 7066 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 7067 | |
| 7068 | if (h->root.type != bfd_link_hash_defined |
| 7069 | && h->root.type != bfd_link_hash_defweak) |
| 7070 | continue; |
| 7071 | |
| 7072 | ps = &h->root.u.def.section; |
| 7073 | sym_name = h->root.root.string; |
| 7074 | } |
| 7075 | else |
| 7076 | { |
| 7077 | Elf_Internal_Sym *sym = isymbuf + r_symndx; |
| 7078 | ps = &finfo->sections[r_symndx]; |
| 7079 | sym_name = bfd_elf_sym_name (input_bfd, |
| 7080 | symtab_hdr, |
| 7081 | sym, *ps); |
| 7082 | } |
| 7083 | |
| 7084 | /* Complain if the definition comes from a |
| 7085 | discarded section. */ |
| 7086 | if ((sec = *ps) != NULL && elf_discarded_section (sec)) |
| 7087 | { |
| 7088 | BFD_ASSERT (r_symndx != 0); |
| 7089 | if (action & COMPLAIN) |
| 7090 | (*finfo->info->callbacks->einfo) |
| 7091 | (_("%X`%s' referenced in section `%A' of %B: " |
| 7092 | "defined in discarded section `%A' of %B"), |
| 7093 | sym_name, o, input_bfd, sec, sec->owner); |
| 7094 | |
| 7095 | /* Try to do the best we can to support buggy old |
| 7096 | versions of gcc. If we've warned, or this is |
| 7097 | debugging info, pretend that the symbol is |
| 7098 | really defined in the kept linkonce section. |
| 7099 | FIXME: This is quite broken. Modifying the |
| 7100 | symbol here means we will be changing all later |
| 7101 | uses of the symbol, not just in this section. |
| 7102 | The only thing that makes this half reasonable |
| 7103 | is that we warn in non-debug sections, and |
| 7104 | debug sections tend to come after other |
| 7105 | sections. */ |
| 7106 | if (action & PRETEND) |
| 7107 | { |
| 7108 | asection *kept; |
| 7109 | |
| 7110 | kept = _bfd_elf_check_kept_section (sec); |
| 7111 | if (kept != NULL) |
| 7112 | { |
| 7113 | *ps = kept; |
| 7114 | continue; |
| 7115 | } |
| 7116 | } |
| 7117 | |
| 7118 | /* Remove the symbol reference from the reloc, but |
| 7119 | don't kill the reloc completely. This is so that |
| 7120 | a zero value will be written into the section, |
| 7121 | which may have non-zero contents put there by the |
| 7122 | assembler. Zero in things like an eh_frame fde |
| 7123 | pc_begin allows stack unwinders to recognize the |
| 7124 | fde as bogus. */ |
| 7125 | rel->r_info &= r_type_mask; |
| 7126 | rel->r_addend = 0; |
| 7127 | } |
| 7128 | } |
| 7129 | } |
| 7130 | |
| 7131 | /* Relocate the section by invoking a back end routine. |
| 7132 | |
| 7133 | The back end routine is responsible for adjusting the |
| 7134 | section contents as necessary, and (if using Rela relocs |
| 7135 | and generating a relocatable output file) adjusting the |
| 7136 | reloc addend as necessary. |
| 7137 | |
| 7138 | The back end routine does not have to worry about setting |
| 7139 | the reloc address or the reloc symbol index. |
| 7140 | |
| 7141 | The back end routine is given a pointer to the swapped in |
| 7142 | internal symbols, and can access the hash table entries |
| 7143 | for the external symbols via elf_sym_hashes (input_bfd). |
| 7144 | |
| 7145 | When generating relocatable output, the back end routine |
| 7146 | must handle STB_LOCAL/STT_SECTION symbols specially. The |
| 7147 | output symbol is going to be a section symbol |
| 7148 | corresponding to the output section, which will require |
| 7149 | the addend to be adjusted. */ |
| 7150 | |
| 7151 | if (! (*relocate_section) (output_bfd, finfo->info, |
| 7152 | input_bfd, o, contents, |
| 7153 | internal_relocs, |
| 7154 | isymbuf, |
| 7155 | finfo->sections)) |
| 7156 | return FALSE; |
| 7157 | |
| 7158 | if (emit_relocs) |
| 7159 | { |
| 7160 | Elf_Internal_Rela *irela; |
| 7161 | Elf_Internal_Rela *irelaend; |
| 7162 | bfd_vma last_offset; |
| 7163 | struct elf_link_hash_entry **rel_hash; |
| 7164 | struct elf_link_hash_entry **rel_hash_list; |
| 7165 | Elf_Internal_Shdr *input_rel_hdr, *input_rel_hdr2; |
| 7166 | unsigned int next_erel; |
| 7167 | bfd_boolean rela_normal; |
| 7168 | |
| 7169 | input_rel_hdr = &elf_section_data (o)->rel_hdr; |
| 7170 | rela_normal = (bed->rela_normal |
| 7171 | && (input_rel_hdr->sh_entsize |
| 7172 | == bed->s->sizeof_rela)); |
| 7173 | |
| 7174 | /* Adjust the reloc addresses and symbol indices. */ |
| 7175 | |
| 7176 | irela = internal_relocs; |
| 7177 | irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel; |
| 7178 | rel_hash = (elf_section_data (o->output_section)->rel_hashes |
| 7179 | + elf_section_data (o->output_section)->rel_count |
| 7180 | + elf_section_data (o->output_section)->rel_count2); |
| 7181 | rel_hash_list = rel_hash; |
| 7182 | last_offset = o->output_offset; |
| 7183 | if (!finfo->info->relocatable) |
| 7184 | last_offset += o->output_section->vma; |
| 7185 | for (next_erel = 0; irela < irelaend; irela++, next_erel++) |
| 7186 | { |
| 7187 | unsigned long r_symndx; |
| 7188 | asection *sec; |
| 7189 | Elf_Internal_Sym sym; |
| 7190 | |
| 7191 | if (next_erel == bed->s->int_rels_per_ext_rel) |
| 7192 | { |
| 7193 | rel_hash++; |
| 7194 | next_erel = 0; |
| 7195 | } |
| 7196 | |
| 7197 | irela->r_offset = _bfd_elf_section_offset (output_bfd, |
| 7198 | finfo->info, o, |
| 7199 | irela->r_offset); |
| 7200 | if (irela->r_offset >= (bfd_vma) -2) |
| 7201 | { |
| 7202 | /* This is a reloc for a deleted entry or somesuch. |
| 7203 | Turn it into an R_*_NONE reloc, at the same |
| 7204 | offset as the last reloc. elf_eh_frame.c and |
| 7205 | elf_bfd_discard_info rely on reloc offsets |
| 7206 | being ordered. */ |
| 7207 | irela->r_offset = last_offset; |
| 7208 | irela->r_info = 0; |
| 7209 | irela->r_addend = 0; |
| 7210 | continue; |
| 7211 | } |
| 7212 | |
| 7213 | irela->r_offset += o->output_offset; |
| 7214 | |
| 7215 | /* Relocs in an executable have to be virtual addresses. */ |
| 7216 | if (!finfo->info->relocatable) |
| 7217 | irela->r_offset += o->output_section->vma; |
| 7218 | |
| 7219 | last_offset = irela->r_offset; |
| 7220 | |
| 7221 | r_symndx = irela->r_info >> r_sym_shift; |
| 7222 | if (r_symndx == STN_UNDEF) |
| 7223 | continue; |
| 7224 | |
| 7225 | if (r_symndx >= locsymcount |
| 7226 | || (elf_bad_symtab (input_bfd) |
| 7227 | && finfo->sections[r_symndx] == NULL)) |
| 7228 | { |
| 7229 | struct elf_link_hash_entry *rh; |
| 7230 | unsigned long indx; |
| 7231 | |
| 7232 | /* This is a reloc against a global symbol. We |
| 7233 | have not yet output all the local symbols, so |
| 7234 | we do not know the symbol index of any global |
| 7235 | symbol. We set the rel_hash entry for this |
| 7236 | reloc to point to the global hash table entry |
| 7237 | for this symbol. The symbol index is then |
| 7238 | set at the end of bfd_elf_final_link. */ |
| 7239 | indx = r_symndx - extsymoff; |
| 7240 | rh = elf_sym_hashes (input_bfd)[indx]; |
| 7241 | while (rh->root.type == bfd_link_hash_indirect |
| 7242 | || rh->root.type == bfd_link_hash_warning) |
| 7243 | rh = (struct elf_link_hash_entry *) rh->root.u.i.link; |
| 7244 | |
| 7245 | /* Setting the index to -2 tells |
| 7246 | elf_link_output_extsym that this symbol is |
| 7247 | used by a reloc. */ |
| 7248 | BFD_ASSERT (rh->indx < 0); |
| 7249 | rh->indx = -2; |
| 7250 | |
| 7251 | *rel_hash = rh; |
| 7252 | |
| 7253 | continue; |
| 7254 | } |
| 7255 | |
| 7256 | /* This is a reloc against a local symbol. */ |
| 7257 | |
| 7258 | *rel_hash = NULL; |
| 7259 | sym = isymbuf[r_symndx]; |
| 7260 | sec = finfo->sections[r_symndx]; |
| 7261 | if (ELF_ST_TYPE (sym.st_info) == STT_SECTION) |
| 7262 | { |
| 7263 | /* I suppose the backend ought to fill in the |
| 7264 | section of any STT_SECTION symbol against a |
| 7265 | processor specific section. */ |
| 7266 | r_symndx = 0; |
| 7267 | if (bfd_is_abs_section (sec)) |
| 7268 | ; |
| 7269 | else if (sec == NULL || sec->owner == NULL) |
| 7270 | { |
| 7271 | bfd_set_error (bfd_error_bad_value); |
| 7272 | return FALSE; |
| 7273 | } |
| 7274 | else |
| 7275 | { |
| 7276 | asection *osec = sec->output_section; |
| 7277 | |
| 7278 | /* If we have discarded a section, the output |
| 7279 | section will be the absolute section. In |
| 7280 | case of discarded link-once and discarded |
| 7281 | SEC_MERGE sections, use the kept section. */ |
| 7282 | if (bfd_is_abs_section (osec) |
| 7283 | && sec->kept_section != NULL |
| 7284 | && sec->kept_section->output_section != NULL) |
| 7285 | { |
| 7286 | osec = sec->kept_section->output_section; |
| 7287 | irela->r_addend -= osec->vma; |
| 7288 | } |
| 7289 | |
| 7290 | if (!bfd_is_abs_section (osec)) |
| 7291 | { |
| 7292 | r_symndx = osec->target_index; |
| 7293 | BFD_ASSERT (r_symndx != 0); |
| 7294 | } |
| 7295 | } |
| 7296 | |
| 7297 | /* Adjust the addend according to where the |
| 7298 | section winds up in the output section. */ |
| 7299 | if (rela_normal) |
| 7300 | irela->r_addend += sec->output_offset; |
| 7301 | } |
| 7302 | else |
| 7303 | { |
| 7304 | if (finfo->indices[r_symndx] == -1) |
| 7305 | { |
| 7306 | unsigned long shlink; |
| 7307 | const char *name; |
| 7308 | asection *osec; |
| 7309 | |
| 7310 | if (finfo->info->strip == strip_all) |
| 7311 | { |
| 7312 | /* You can't do ld -r -s. */ |
| 7313 | bfd_set_error (bfd_error_invalid_operation); |
| 7314 | return FALSE; |
| 7315 | } |
| 7316 | |
| 7317 | /* This symbol was skipped earlier, but |
| 7318 | since it is needed by a reloc, we |
| 7319 | must output it now. */ |
| 7320 | shlink = symtab_hdr->sh_link; |
| 7321 | name = (bfd_elf_string_from_elf_section |
| 7322 | (input_bfd, shlink, sym.st_name)); |
| 7323 | if (name == NULL) |
| 7324 | return FALSE; |
| 7325 | |
| 7326 | osec = sec->output_section; |
| 7327 | sym.st_shndx = |
| 7328 | _bfd_elf_section_from_bfd_section (output_bfd, |
| 7329 | osec); |
| 7330 | if (sym.st_shndx == SHN_BAD) |
| 7331 | return FALSE; |
| 7332 | |
| 7333 | sym.st_value += sec->output_offset; |
| 7334 | if (! finfo->info->relocatable) |
| 7335 | { |
| 7336 | sym.st_value += osec->vma; |
| 7337 | if (ELF_ST_TYPE (sym.st_info) == STT_TLS) |
| 7338 | { |
| 7339 | /* STT_TLS symbols are relative to PT_TLS |
| 7340 | segment base. */ |
| 7341 | BFD_ASSERT (elf_hash_table (finfo->info) |
| 7342 | ->tls_sec != NULL); |
| 7343 | sym.st_value -= (elf_hash_table (finfo->info) |
| 7344 | ->tls_sec->vma); |
| 7345 | } |
| 7346 | } |
| 7347 | |
| 7348 | finfo->indices[r_symndx] |
| 7349 | = bfd_get_symcount (output_bfd); |
| 7350 | |
| 7351 | if (! elf_link_output_sym (finfo, name, &sym, sec, |
| 7352 | NULL)) |
| 7353 | return FALSE; |
| 7354 | } |
| 7355 | |
| 7356 | r_symndx = finfo->indices[r_symndx]; |
| 7357 | } |
| 7358 | |
| 7359 | irela->r_info = ((bfd_vma) r_symndx << r_sym_shift |
| 7360 | | (irela->r_info & r_type_mask)); |
| 7361 | } |
| 7362 | |
| 7363 | /* Swap out the relocs. */ |
| 7364 | if (input_rel_hdr->sh_size != 0 |
| 7365 | && !bed->elf_backend_emit_relocs (output_bfd, o, |
| 7366 | input_rel_hdr, |
| 7367 | internal_relocs, |
| 7368 | rel_hash_list)) |
| 7369 | return FALSE; |
| 7370 | |
| 7371 | input_rel_hdr2 = elf_section_data (o)->rel_hdr2; |
| 7372 | if (input_rel_hdr2 && input_rel_hdr2->sh_size != 0) |
| 7373 | { |
| 7374 | internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr) |
| 7375 | * bed->s->int_rels_per_ext_rel); |
| 7376 | rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr); |
| 7377 | if (!bed->elf_backend_emit_relocs (output_bfd, o, |
| 7378 | input_rel_hdr2, |
| 7379 | internal_relocs, |
| 7380 | rel_hash_list)) |
| 7381 | return FALSE; |
| 7382 | } |
| 7383 | } |
| 7384 | } |
| 7385 | |
| 7386 | /* Write out the modified section contents. */ |
| 7387 | if (bed->elf_backend_write_section |
| 7388 | && (*bed->elf_backend_write_section) (output_bfd, o, contents)) |
| 7389 | { |
| 7390 | /* Section written out. */ |
| 7391 | } |
| 7392 | else switch (o->sec_info_type) |
| 7393 | { |
| 7394 | case ELF_INFO_TYPE_STABS: |
| 7395 | if (! (_bfd_write_section_stabs |
| 7396 | (output_bfd, |
| 7397 | &elf_hash_table (finfo->info)->stab_info, |
| 7398 | o, &elf_section_data (o)->sec_info, contents))) |
| 7399 | return FALSE; |
| 7400 | break; |
| 7401 | case ELF_INFO_TYPE_MERGE: |
| 7402 | if (! _bfd_write_merged_section (output_bfd, o, |
| 7403 | elf_section_data (o)->sec_info)) |
| 7404 | return FALSE; |
| 7405 | break; |
| 7406 | case ELF_INFO_TYPE_EH_FRAME: |
| 7407 | { |
| 7408 | if (! _bfd_elf_write_section_eh_frame (output_bfd, finfo->info, |
| 7409 | o, contents)) |
| 7410 | return FALSE; |
| 7411 | } |
| 7412 | break; |
| 7413 | default: |
| 7414 | { |
| 7415 | if (! (o->flags & SEC_EXCLUDE) |
| 7416 | && ! bfd_set_section_contents (output_bfd, o->output_section, |
| 7417 | contents, |
| 7418 | (file_ptr) o->output_offset, |
| 7419 | o->size)) |
| 7420 | return FALSE; |
| 7421 | } |
| 7422 | break; |
| 7423 | } |
| 7424 | } |
| 7425 | |
| 7426 | return TRUE; |
| 7427 | } |
| 7428 | |
| 7429 | /* Generate a reloc when linking an ELF file. This is a reloc |
| 7430 | requested by the linker, and does come from any input file. This |
| 7431 | is used to build constructor and destructor tables when linking |
| 7432 | with -Ur. */ |
| 7433 | |
| 7434 | static bfd_boolean |
| 7435 | elf_reloc_link_order (bfd *output_bfd, |
| 7436 | struct bfd_link_info *info, |
| 7437 | asection *output_section, |
| 7438 | struct bfd_link_order *link_order) |
| 7439 | { |
| 7440 | reloc_howto_type *howto; |
| 7441 | long indx; |
| 7442 | bfd_vma offset; |
| 7443 | bfd_vma addend; |
| 7444 | struct elf_link_hash_entry **rel_hash_ptr; |
| 7445 | Elf_Internal_Shdr *rel_hdr; |
| 7446 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); |
| 7447 | Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL]; |
| 7448 | bfd_byte *erel; |
| 7449 | unsigned int i; |
| 7450 | |
| 7451 | howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc); |
| 7452 | if (howto == NULL) |
| 7453 | { |
| 7454 | bfd_set_error (bfd_error_bad_value); |
| 7455 | return FALSE; |
| 7456 | } |
| 7457 | |
| 7458 | addend = link_order->u.reloc.p->addend; |
| 7459 | |
| 7460 | /* Figure out the symbol index. */ |
| 7461 | rel_hash_ptr = (elf_section_data (output_section)->rel_hashes |
| 7462 | + elf_section_data (output_section)->rel_count |
| 7463 | + elf_section_data (output_section)->rel_count2); |
| 7464 | if (link_order->type == bfd_section_reloc_link_order) |
| 7465 | { |
| 7466 | indx = link_order->u.reloc.p->u.section->target_index; |
| 7467 | BFD_ASSERT (indx != 0); |
| 7468 | *rel_hash_ptr = NULL; |
| 7469 | } |
| 7470 | else |
| 7471 | { |
| 7472 | struct elf_link_hash_entry *h; |
| 7473 | |
| 7474 | /* Treat a reloc against a defined symbol as though it were |
| 7475 | actually against the section. */ |
| 7476 | h = ((struct elf_link_hash_entry *) |
| 7477 | bfd_wrapped_link_hash_lookup (output_bfd, info, |
| 7478 | link_order->u.reloc.p->u.name, |
| 7479 | FALSE, FALSE, TRUE)); |
| 7480 | if (h != NULL |
| 7481 | && (h->root.type == bfd_link_hash_defined |
| 7482 | || h->root.type == bfd_link_hash_defweak)) |
| 7483 | { |
| 7484 | asection *section; |
| 7485 | |
| 7486 | section = h->root.u.def.section; |
| 7487 | indx = section->output_section->target_index; |
| 7488 | *rel_hash_ptr = NULL; |
| 7489 | /* It seems that we ought to add the symbol value to the |
| 7490 | addend here, but in practice it has already been added |
| 7491 | because it was passed to constructor_callback. */ |
| 7492 | addend += section->output_section->vma + section->output_offset; |
| 7493 | } |
| 7494 | else if (h != NULL) |
| 7495 | { |
| 7496 | /* Setting the index to -2 tells elf_link_output_extsym that |
| 7497 | this symbol is used by a reloc. */ |
| 7498 | h->indx = -2; |
| 7499 | *rel_hash_ptr = h; |
| 7500 | indx = 0; |
| 7501 | } |
| 7502 | else |
| 7503 | { |
| 7504 | if (! ((*info->callbacks->unattached_reloc) |
| 7505 | (info, link_order->u.reloc.p->u.name, NULL, NULL, 0))) |
| 7506 | return FALSE; |
| 7507 | indx = 0; |
| 7508 | } |
| 7509 | } |
| 7510 | |
| 7511 | /* If this is an inplace reloc, we must write the addend into the |
| 7512 | object file. */ |
| 7513 | if (howto->partial_inplace && addend != 0) |
| 7514 | { |
| 7515 | bfd_size_type size; |
| 7516 | bfd_reloc_status_type rstat; |
| 7517 | bfd_byte *buf; |
| 7518 | bfd_boolean ok; |
| 7519 | const char *sym_name; |
| 7520 | |
| 7521 | size = bfd_get_reloc_size (howto); |
| 7522 | buf = bfd_zmalloc (size); |
| 7523 | if (buf == NULL) |
| 7524 | return FALSE; |
| 7525 | rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf); |
| 7526 | switch (rstat) |
| 7527 | { |
| 7528 | case bfd_reloc_ok: |
| 7529 | break; |
| 7530 | |
| 7531 | default: |
| 7532 | case bfd_reloc_outofrange: |
| 7533 | abort (); |
| 7534 | |
| 7535 | case bfd_reloc_overflow: |
| 7536 | if (link_order->type == bfd_section_reloc_link_order) |
| 7537 | sym_name = bfd_section_name (output_bfd, |
| 7538 | link_order->u.reloc.p->u.section); |
| 7539 | else |
| 7540 | sym_name = link_order->u.reloc.p->u.name; |
| 7541 | if (! ((*info->callbacks->reloc_overflow) |
| 7542 | (info, NULL, sym_name, howto->name, addend, NULL, |
| 7543 | NULL, (bfd_vma) 0))) |
| 7544 | { |
| 7545 | free (buf); |
| 7546 | return FALSE; |
| 7547 | } |
| 7548 | break; |
| 7549 | } |
| 7550 | ok = bfd_set_section_contents (output_bfd, output_section, buf, |
| 7551 | link_order->offset, size); |
| 7552 | free (buf); |
| 7553 | if (! ok) |
| 7554 | return FALSE; |
| 7555 | } |
| 7556 | |
| 7557 | /* The address of a reloc is relative to the section in a |
| 7558 | relocatable file, and is a virtual address in an executable |
| 7559 | file. */ |
| 7560 | offset = link_order->offset; |
| 7561 | if (! info->relocatable) |
| 7562 | offset += output_section->vma; |
| 7563 | |
| 7564 | for (i = 0; i < bed->s->int_rels_per_ext_rel; i++) |
| 7565 | { |
| 7566 | irel[i].r_offset = offset; |
| 7567 | irel[i].r_info = 0; |
| 7568 | irel[i].r_addend = 0; |
| 7569 | } |
| 7570 | if (bed->s->arch_size == 32) |
| 7571 | irel[0].r_info = ELF32_R_INFO (indx, howto->type); |
| 7572 | else |
| 7573 | irel[0].r_info = ELF64_R_INFO (indx, howto->type); |
| 7574 | |
| 7575 | rel_hdr = &elf_section_data (output_section)->rel_hdr; |
| 7576 | erel = rel_hdr->contents; |
| 7577 | if (rel_hdr->sh_type == SHT_REL) |
| 7578 | { |
| 7579 | erel += (elf_section_data (output_section)->rel_count |
| 7580 | * bed->s->sizeof_rel); |
| 7581 | (*bed->s->swap_reloc_out) (output_bfd, irel, erel); |
| 7582 | } |
| 7583 | else |
| 7584 | { |
| 7585 | irel[0].r_addend = addend; |
| 7586 | erel += (elf_section_data (output_section)->rel_count |
| 7587 | * bed->s->sizeof_rela); |
| 7588 | (*bed->s->swap_reloca_out) (output_bfd, irel, erel); |
| 7589 | } |
| 7590 | |
| 7591 | ++elf_section_data (output_section)->rel_count; |
| 7592 | |
| 7593 | return TRUE; |
| 7594 | } |
| 7595 | |
| 7596 | |
| 7597 | /* Get the output vma of the section pointed to by the sh_link field. */ |
| 7598 | |
| 7599 | static bfd_vma |
| 7600 | elf_get_linked_section_vma (struct bfd_link_order *p) |
| 7601 | { |
| 7602 | Elf_Internal_Shdr **elf_shdrp; |
| 7603 | asection *s; |
| 7604 | int elfsec; |
| 7605 | |
| 7606 | s = p->u.indirect.section; |
| 7607 | elf_shdrp = elf_elfsections (s->owner); |
| 7608 | elfsec = _bfd_elf_section_from_bfd_section (s->owner, s); |
| 7609 | elfsec = elf_shdrp[elfsec]->sh_link; |
| 7610 | /* PR 290: |
| 7611 | The Intel C compiler generates SHT_IA_64_UNWIND with |
| 7612 | SHF_LINK_ORDER. But it doesn't set theh sh_link or |
| 7613 | sh_info fields. Hence we could get the situation |
| 7614 | where elfsec is 0. */ |
| 7615 | if (elfsec == 0) |
| 7616 | { |
| 7617 | const struct elf_backend_data *bed |
| 7618 | = get_elf_backend_data (s->owner); |
| 7619 | if (bed->link_order_error_handler) |
| 7620 | bed->link_order_error_handler |
| 7621 | (_("%B: warning: sh_link not set for section `%A'"), s->owner, s); |
| 7622 | return 0; |
| 7623 | } |
| 7624 | else |
| 7625 | { |
| 7626 | s = elf_shdrp[elfsec]->bfd_section; |
| 7627 | return s->output_section->vma + s->output_offset; |
| 7628 | } |
| 7629 | } |
| 7630 | |
| 7631 | |
| 7632 | /* Compare two sections based on the locations of the sections they are |
| 7633 | linked to. Used by elf_fixup_link_order. */ |
| 7634 | |
| 7635 | static int |
| 7636 | compare_link_order (const void * a, const void * b) |
| 7637 | { |
| 7638 | bfd_vma apos; |
| 7639 | bfd_vma bpos; |
| 7640 | |
| 7641 | apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a); |
| 7642 | bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b); |
| 7643 | if (apos < bpos) |
| 7644 | return -1; |
| 7645 | return apos > bpos; |
| 7646 | } |
| 7647 | |
| 7648 | |
| 7649 | /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same |
| 7650 | order as their linked sections. Returns false if this could not be done |
| 7651 | because an output section includes both ordered and unordered |
| 7652 | sections. Ideally we'd do this in the linker proper. */ |
| 7653 | |
| 7654 | static bfd_boolean |
| 7655 | elf_fixup_link_order (bfd *abfd, asection *o) |
| 7656 | { |
| 7657 | int seen_linkorder; |
| 7658 | int seen_other; |
| 7659 | int n; |
| 7660 | struct bfd_link_order *p; |
| 7661 | bfd *sub; |
| 7662 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 7663 | int elfsec; |
| 7664 | struct bfd_link_order **sections; |
| 7665 | asection *s; |
| 7666 | bfd_vma offset; |
| 7667 | |
| 7668 | seen_other = 0; |
| 7669 | seen_linkorder = 0; |
| 7670 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 7671 | { |
| 7672 | if (p->type == bfd_indirect_link_order |
| 7673 | && (bfd_get_flavour ((sub = p->u.indirect.section->owner)) |
| 7674 | == bfd_target_elf_flavour) |
| 7675 | && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass) |
| 7676 | { |
| 7677 | s = p->u.indirect.section; |
| 7678 | elfsec = _bfd_elf_section_from_bfd_section (sub, s); |
| 7679 | if (elfsec != -1 |
| 7680 | && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER) |
| 7681 | seen_linkorder++; |
| 7682 | else |
| 7683 | seen_other++; |
| 7684 | } |
| 7685 | else |
| 7686 | seen_other++; |
| 7687 | } |
| 7688 | |
| 7689 | if (!seen_linkorder) |
| 7690 | return TRUE; |
| 7691 | |
| 7692 | if (seen_other && seen_linkorder) |
| 7693 | { |
| 7694 | (*_bfd_error_handler) (_("%A has both ordered and unordered sections"), |
| 7695 | o); |
| 7696 | bfd_set_error (bfd_error_bad_value); |
| 7697 | return FALSE; |
| 7698 | } |
| 7699 | |
| 7700 | sections = (struct bfd_link_order **) |
| 7701 | xmalloc (seen_linkorder * sizeof (struct bfd_link_order *)); |
| 7702 | seen_linkorder = 0; |
| 7703 | |
| 7704 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 7705 | { |
| 7706 | sections[seen_linkorder++] = p; |
| 7707 | } |
| 7708 | /* Sort the input sections in the order of their linked section. */ |
| 7709 | qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *), |
| 7710 | compare_link_order); |
| 7711 | |
| 7712 | /* Change the offsets of the sections. */ |
| 7713 | offset = 0; |
| 7714 | for (n = 0; n < seen_linkorder; n++) |
| 7715 | { |
| 7716 | s = sections[n]->u.indirect.section; |
| 7717 | offset &= ~(bfd_vma)((1 << s->alignment_power) - 1); |
| 7718 | s->output_offset = offset; |
| 7719 | sections[n]->offset = offset; |
| 7720 | offset += sections[n]->size; |
| 7721 | } |
| 7722 | |
| 7723 | return TRUE; |
| 7724 | } |
| 7725 | |
| 7726 | |
| 7727 | /* Do the final step of an ELF link. */ |
| 7728 | |
| 7729 | bfd_boolean |
| 7730 | bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info) |
| 7731 | { |
| 7732 | bfd_boolean dynamic; |
| 7733 | bfd_boolean emit_relocs; |
| 7734 | bfd *dynobj; |
| 7735 | struct elf_final_link_info finfo; |
| 7736 | register asection *o; |
| 7737 | register struct bfd_link_order *p; |
| 7738 | register bfd *sub; |
| 7739 | bfd_size_type max_contents_size; |
| 7740 | bfd_size_type max_external_reloc_size; |
| 7741 | bfd_size_type max_internal_reloc_count; |
| 7742 | bfd_size_type max_sym_count; |
| 7743 | bfd_size_type max_sym_shndx_count; |
| 7744 | file_ptr off; |
| 7745 | Elf_Internal_Sym elfsym; |
| 7746 | unsigned int i; |
| 7747 | Elf_Internal_Shdr *symtab_hdr; |
| 7748 | Elf_Internal_Shdr *symtab_shndx_hdr; |
| 7749 | Elf_Internal_Shdr *symstrtab_hdr; |
| 7750 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 7751 | struct elf_outext_info eoinfo; |
| 7752 | bfd_boolean merged; |
| 7753 | size_t relativecount = 0; |
| 7754 | asection *reldyn = 0; |
| 7755 | bfd_size_type amt; |
| 7756 | |
| 7757 | if (! is_elf_hash_table (info->hash)) |
| 7758 | return FALSE; |
| 7759 | |
| 7760 | if (info->shared) |
| 7761 | abfd->flags |= DYNAMIC; |
| 7762 | |
| 7763 | dynamic = elf_hash_table (info)->dynamic_sections_created; |
| 7764 | dynobj = elf_hash_table (info)->dynobj; |
| 7765 | |
| 7766 | emit_relocs = (info->relocatable |
| 7767 | || info->emitrelocations |
| 7768 | || bed->elf_backend_emit_relocs); |
| 7769 | |
| 7770 | finfo.info = info; |
| 7771 | finfo.output_bfd = abfd; |
| 7772 | finfo.symstrtab = _bfd_elf_stringtab_init (); |
| 7773 | if (finfo.symstrtab == NULL) |
| 7774 | return FALSE; |
| 7775 | |
| 7776 | if (! dynamic) |
| 7777 | { |
| 7778 | finfo.dynsym_sec = NULL; |
| 7779 | finfo.hash_sec = NULL; |
| 7780 | finfo.symver_sec = NULL; |
| 7781 | } |
| 7782 | else |
| 7783 | { |
| 7784 | finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym"); |
| 7785 | finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash"); |
| 7786 | BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL); |
| 7787 | finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version"); |
| 7788 | /* Note that it is OK if symver_sec is NULL. */ |
| 7789 | } |
| 7790 | |
| 7791 | finfo.contents = NULL; |
| 7792 | finfo.external_relocs = NULL; |
| 7793 | finfo.internal_relocs = NULL; |
| 7794 | finfo.external_syms = NULL; |
| 7795 | finfo.locsym_shndx = NULL; |
| 7796 | finfo.internal_syms = NULL; |
| 7797 | finfo.indices = NULL; |
| 7798 | finfo.sections = NULL; |
| 7799 | finfo.symbuf = NULL; |
| 7800 | finfo.symshndxbuf = NULL; |
| 7801 | finfo.symbuf_count = 0; |
| 7802 | finfo.shndxbuf_size = 0; |
| 7803 | |
| 7804 | /* Count up the number of relocations we will output for each output |
| 7805 | section, so that we know the sizes of the reloc sections. We |
| 7806 | also figure out some maximum sizes. */ |
| 7807 | max_contents_size = 0; |
| 7808 | max_external_reloc_size = 0; |
| 7809 | max_internal_reloc_count = 0; |
| 7810 | max_sym_count = 0; |
| 7811 | max_sym_shndx_count = 0; |
| 7812 | merged = FALSE; |
| 7813 | for (o = abfd->sections; o != NULL; o = o->next) |
| 7814 | { |
| 7815 | struct bfd_elf_section_data *esdo = elf_section_data (o); |
| 7816 | o->reloc_count = 0; |
| 7817 | |
| 7818 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 7819 | { |
| 7820 | unsigned int reloc_count = 0; |
| 7821 | struct bfd_elf_section_data *esdi = NULL; |
| 7822 | unsigned int *rel_count1; |
| 7823 | |
| 7824 | if (p->type == bfd_section_reloc_link_order |
| 7825 | || p->type == bfd_symbol_reloc_link_order) |
| 7826 | reloc_count = 1; |
| 7827 | else if (p->type == bfd_indirect_link_order) |
| 7828 | { |
| 7829 | asection *sec; |
| 7830 | |
| 7831 | sec = p->u.indirect.section; |
| 7832 | esdi = elf_section_data (sec); |
| 7833 | |
| 7834 | /* Mark all sections which are to be included in the |
| 7835 | link. This will normally be every section. We need |
| 7836 | to do this so that we can identify any sections which |
| 7837 | the linker has decided to not include. */ |
| 7838 | sec->linker_mark = TRUE; |
| 7839 | |
| 7840 | if (sec->flags & SEC_MERGE) |
| 7841 | merged = TRUE; |
| 7842 | |
| 7843 | if (info->relocatable || info->emitrelocations) |
| 7844 | reloc_count = sec->reloc_count; |
| 7845 | else if (bed->elf_backend_count_relocs) |
| 7846 | { |
| 7847 | Elf_Internal_Rela * relocs; |
| 7848 | |
| 7849 | relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, |
| 7850 | info->keep_memory); |
| 7851 | |
| 7852 | reloc_count = (*bed->elf_backend_count_relocs) (sec, relocs); |
| 7853 | |
| 7854 | if (elf_section_data (o)->relocs != relocs) |
| 7855 | free (relocs); |
| 7856 | } |
| 7857 | |
| 7858 | if (sec->rawsize > max_contents_size) |
| 7859 | max_contents_size = sec->rawsize; |
| 7860 | if (sec->size > max_contents_size) |
| 7861 | max_contents_size = sec->size; |
| 7862 | |
| 7863 | /* We are interested in just local symbols, not all |
| 7864 | symbols. */ |
| 7865 | if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour |
| 7866 | && (sec->owner->flags & DYNAMIC) == 0) |
| 7867 | { |
| 7868 | size_t sym_count; |
| 7869 | |
| 7870 | if (elf_bad_symtab (sec->owner)) |
| 7871 | sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size |
| 7872 | / bed->s->sizeof_sym); |
| 7873 | else |
| 7874 | sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info; |
| 7875 | |
| 7876 | if (sym_count > max_sym_count) |
| 7877 | max_sym_count = sym_count; |
| 7878 | |
| 7879 | if (sym_count > max_sym_shndx_count |
| 7880 | && elf_symtab_shndx (sec->owner) != 0) |
| 7881 | max_sym_shndx_count = sym_count; |
| 7882 | |
| 7883 | if ((sec->flags & SEC_RELOC) != 0) |
| 7884 | { |
| 7885 | size_t ext_size; |
| 7886 | |
| 7887 | ext_size = elf_section_data (sec)->rel_hdr.sh_size; |
| 7888 | if (ext_size > max_external_reloc_size) |
| 7889 | max_external_reloc_size = ext_size; |
| 7890 | if (sec->reloc_count > max_internal_reloc_count) |
| 7891 | max_internal_reloc_count = sec->reloc_count; |
| 7892 | } |
| 7893 | } |
| 7894 | } |
| 7895 | |
| 7896 | if (reloc_count == 0) |
| 7897 | continue; |
| 7898 | |
| 7899 | o->reloc_count += reloc_count; |
| 7900 | |
| 7901 | /* MIPS may have a mix of REL and RELA relocs on sections. |
| 7902 | To support this curious ABI we keep reloc counts in |
| 7903 | elf_section_data too. We must be careful to add the |
| 7904 | relocations from the input section to the right output |
| 7905 | count. FIXME: Get rid of one count. We have |
| 7906 | o->reloc_count == esdo->rel_count + esdo->rel_count2. */ |
| 7907 | rel_count1 = &esdo->rel_count; |
| 7908 | if (esdi != NULL) |
| 7909 | { |
| 7910 | bfd_boolean same_size; |
| 7911 | bfd_size_type entsize1; |
| 7912 | |
| 7913 | entsize1 = esdi->rel_hdr.sh_entsize; |
| 7914 | BFD_ASSERT (entsize1 == bed->s->sizeof_rel |
| 7915 | || entsize1 == bed->s->sizeof_rela); |
| 7916 | same_size = !o->use_rela_p == (entsize1 == bed->s->sizeof_rel); |
| 7917 | |
| 7918 | if (!same_size) |
| 7919 | rel_count1 = &esdo->rel_count2; |
| 7920 | |
| 7921 | if (esdi->rel_hdr2 != NULL) |
| 7922 | { |
| 7923 | bfd_size_type entsize2 = esdi->rel_hdr2->sh_entsize; |
| 7924 | unsigned int alt_count; |
| 7925 | unsigned int *rel_count2; |
| 7926 | |
| 7927 | BFD_ASSERT (entsize2 != entsize1 |
| 7928 | && (entsize2 == bed->s->sizeof_rel |
| 7929 | || entsize2 == bed->s->sizeof_rela)); |
| 7930 | |
| 7931 | rel_count2 = &esdo->rel_count2; |
| 7932 | if (!same_size) |
| 7933 | rel_count2 = &esdo->rel_count; |
| 7934 | |
| 7935 | /* The following is probably too simplistic if the |
| 7936 | backend counts output relocs unusually. */ |
| 7937 | BFD_ASSERT (bed->elf_backend_count_relocs == NULL); |
| 7938 | alt_count = NUM_SHDR_ENTRIES (esdi->rel_hdr2); |
| 7939 | *rel_count2 += alt_count; |
| 7940 | reloc_count -= alt_count; |
| 7941 | } |
| 7942 | } |
| 7943 | *rel_count1 += reloc_count; |
| 7944 | } |
| 7945 | |
| 7946 | if (o->reloc_count > 0) |
| 7947 | o->flags |= SEC_RELOC; |
| 7948 | else |
| 7949 | { |
| 7950 | /* Explicitly clear the SEC_RELOC flag. The linker tends to |
| 7951 | set it (this is probably a bug) and if it is set |
| 7952 | assign_section_numbers will create a reloc section. */ |
| 7953 | o->flags &=~ SEC_RELOC; |
| 7954 | } |
| 7955 | |
| 7956 | /* If the SEC_ALLOC flag is not set, force the section VMA to |
| 7957 | zero. This is done in elf_fake_sections as well, but forcing |
| 7958 | the VMA to 0 here will ensure that relocs against these |
| 7959 | sections are handled correctly. */ |
| 7960 | if ((o->flags & SEC_ALLOC) == 0 |
| 7961 | && ! o->user_set_vma) |
| 7962 | o->vma = 0; |
| 7963 | } |
| 7964 | |
| 7965 | if (! info->relocatable && merged) |
| 7966 | elf_link_hash_traverse (elf_hash_table (info), |
| 7967 | _bfd_elf_link_sec_merge_syms, abfd); |
| 7968 | |
| 7969 | /* Figure out the file positions for everything but the symbol table |
| 7970 | and the relocs. We set symcount to force assign_section_numbers |
| 7971 | to create a symbol table. */ |
| 7972 | bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1; |
| 7973 | BFD_ASSERT (! abfd->output_has_begun); |
| 7974 | if (! _bfd_elf_compute_section_file_positions (abfd, info)) |
| 7975 | goto error_return; |
| 7976 | |
| 7977 | /* Set sizes, and assign file positions for reloc sections. */ |
| 7978 | for (o = abfd->sections; o != NULL; o = o->next) |
| 7979 | { |
| 7980 | if ((o->flags & SEC_RELOC) != 0) |
| 7981 | { |
| 7982 | if (!(_bfd_elf_link_size_reloc_section |
| 7983 | (abfd, &elf_section_data (o)->rel_hdr, o))) |
| 7984 | goto error_return; |
| 7985 | |
| 7986 | if (elf_section_data (o)->rel_hdr2 |
| 7987 | && !(_bfd_elf_link_size_reloc_section |
| 7988 | (abfd, elf_section_data (o)->rel_hdr2, o))) |
| 7989 | goto error_return; |
| 7990 | } |
| 7991 | |
| 7992 | /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them |
| 7993 | to count upwards while actually outputting the relocations. */ |
| 7994 | elf_section_data (o)->rel_count = 0; |
| 7995 | elf_section_data (o)->rel_count2 = 0; |
| 7996 | } |
| 7997 | |
| 7998 | _bfd_elf_assign_file_positions_for_relocs (abfd); |
| 7999 | |
| 8000 | /* We have now assigned file positions for all the sections except |
| 8001 | .symtab and .strtab. We start the .symtab section at the current |
| 8002 | file position, and write directly to it. We build the .strtab |
| 8003 | section in memory. */ |
| 8004 | bfd_get_symcount (abfd) = 0; |
| 8005 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 8006 | /* sh_name is set in prep_headers. */ |
| 8007 | symtab_hdr->sh_type = SHT_SYMTAB; |
| 8008 | /* sh_flags, sh_addr and sh_size all start off zero. */ |
| 8009 | symtab_hdr->sh_entsize = bed->s->sizeof_sym; |
| 8010 | /* sh_link is set in assign_section_numbers. */ |
| 8011 | /* sh_info is set below. */ |
| 8012 | /* sh_offset is set just below. */ |
| 8013 | symtab_hdr->sh_addralign = 1 << bed->s->log_file_align; |
| 8014 | |
| 8015 | off = elf_tdata (abfd)->next_file_pos; |
| 8016 | off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE); |
| 8017 | |
| 8018 | /* Note that at this point elf_tdata (abfd)->next_file_pos is |
| 8019 | incorrect. We do not yet know the size of the .symtab section. |
| 8020 | We correct next_file_pos below, after we do know the size. */ |
| 8021 | |
| 8022 | /* Allocate a buffer to hold swapped out symbols. This is to avoid |
| 8023 | continuously seeking to the right position in the file. */ |
| 8024 | if (! info->keep_memory || max_sym_count < 20) |
| 8025 | finfo.symbuf_size = 20; |
| 8026 | else |
| 8027 | finfo.symbuf_size = max_sym_count; |
| 8028 | amt = finfo.symbuf_size; |
| 8029 | amt *= bed->s->sizeof_sym; |
| 8030 | finfo.symbuf = bfd_malloc (amt); |
| 8031 | if (finfo.symbuf == NULL) |
| 8032 | goto error_return; |
| 8033 | if (elf_numsections (abfd) > SHN_LORESERVE) |
| 8034 | { |
| 8035 | /* Wild guess at number of output symbols. realloc'd as needed. */ |
| 8036 | amt = 2 * max_sym_count + elf_numsections (abfd) + 1000; |
| 8037 | finfo.shndxbuf_size = amt; |
| 8038 | amt *= sizeof (Elf_External_Sym_Shndx); |
| 8039 | finfo.symshndxbuf = bfd_zmalloc (amt); |
| 8040 | if (finfo.symshndxbuf == NULL) |
| 8041 | goto error_return; |
| 8042 | } |
| 8043 | |
| 8044 | /* Start writing out the symbol table. The first symbol is always a |
| 8045 | dummy symbol. */ |
| 8046 | if (info->strip != strip_all |
| 8047 | || emit_relocs) |
| 8048 | { |
| 8049 | elfsym.st_value = 0; |
| 8050 | elfsym.st_size = 0; |
| 8051 | elfsym.st_info = 0; |
| 8052 | elfsym.st_other = 0; |
| 8053 | elfsym.st_shndx = SHN_UNDEF; |
| 8054 | if (! elf_link_output_sym (&finfo, NULL, &elfsym, bfd_und_section_ptr, |
| 8055 | NULL)) |
| 8056 | goto error_return; |
| 8057 | } |
| 8058 | |
| 8059 | /* Output a symbol for each section. We output these even if we are |
| 8060 | discarding local symbols, since they are used for relocs. These |
| 8061 | symbols have no names. We store the index of each one in the |
| 8062 | index field of the section, so that we can find it again when |
| 8063 | outputting relocs. */ |
| 8064 | if (info->strip != strip_all |
| 8065 | || emit_relocs) |
| 8066 | { |
| 8067 | elfsym.st_size = 0; |
| 8068 | elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION); |
| 8069 | elfsym.st_other = 0; |
| 8070 | for (i = 1; i < elf_numsections (abfd); i++) |
| 8071 | { |
| 8072 | o = bfd_section_from_elf_index (abfd, i); |
| 8073 | if (o != NULL) |
| 8074 | o->target_index = bfd_get_symcount (abfd); |
| 8075 | elfsym.st_shndx = i; |
| 8076 | if (info->relocatable || o == NULL) |
| 8077 | elfsym.st_value = 0; |
| 8078 | else |
| 8079 | elfsym.st_value = o->vma; |
| 8080 | if (! elf_link_output_sym (&finfo, NULL, &elfsym, o, NULL)) |
| 8081 | goto error_return; |
| 8082 | if (i == SHN_LORESERVE - 1) |
| 8083 | i += SHN_HIRESERVE + 1 - SHN_LORESERVE; |
| 8084 | } |
| 8085 | } |
| 8086 | |
| 8087 | /* Allocate some memory to hold information read in from the input |
| 8088 | files. */ |
| 8089 | if (max_contents_size != 0) |
| 8090 | { |
| 8091 | finfo.contents = bfd_malloc (max_contents_size); |
| 8092 | if (finfo.contents == NULL) |
| 8093 | goto error_return; |
| 8094 | } |
| 8095 | |
| 8096 | if (max_external_reloc_size != 0) |
| 8097 | { |
| 8098 | finfo.external_relocs = bfd_malloc (max_external_reloc_size); |
| 8099 | if (finfo.external_relocs == NULL) |
| 8100 | goto error_return; |
| 8101 | } |
| 8102 | |
| 8103 | if (max_internal_reloc_count != 0) |
| 8104 | { |
| 8105 | amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel; |
| 8106 | amt *= sizeof (Elf_Internal_Rela); |
| 8107 | finfo.internal_relocs = bfd_malloc (amt); |
| 8108 | if (finfo.internal_relocs == NULL) |
| 8109 | goto error_return; |
| 8110 | } |
| 8111 | |
| 8112 | if (max_sym_count != 0) |
| 8113 | { |
| 8114 | amt = max_sym_count * bed->s->sizeof_sym; |
| 8115 | finfo.external_syms = bfd_malloc (amt); |
| 8116 | if (finfo.external_syms == NULL) |
| 8117 | goto error_return; |
| 8118 | |
| 8119 | amt = max_sym_count * sizeof (Elf_Internal_Sym); |
| 8120 | finfo.internal_syms = bfd_malloc (amt); |
| 8121 | if (finfo.internal_syms == NULL) |
| 8122 | goto error_return; |
| 8123 | |
| 8124 | amt = max_sym_count * sizeof (long); |
| 8125 | finfo.indices = bfd_malloc (amt); |
| 8126 | if (finfo.indices == NULL) |
| 8127 | goto error_return; |
| 8128 | |
| 8129 | amt = max_sym_count * sizeof (asection *); |
| 8130 | finfo.sections = bfd_malloc (amt); |
| 8131 | if (finfo.sections == NULL) |
| 8132 | goto error_return; |
| 8133 | } |
| 8134 | |
| 8135 | if (max_sym_shndx_count != 0) |
| 8136 | { |
| 8137 | amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx); |
| 8138 | finfo.locsym_shndx = bfd_malloc (amt); |
| 8139 | if (finfo.locsym_shndx == NULL) |
| 8140 | goto error_return; |
| 8141 | } |
| 8142 | |
| 8143 | if (elf_hash_table (info)->tls_sec) |
| 8144 | { |
| 8145 | bfd_vma base, end = 0; |
| 8146 | asection *sec; |
| 8147 | |
| 8148 | for (sec = elf_hash_table (info)->tls_sec; |
| 8149 | sec && (sec->flags & SEC_THREAD_LOCAL); |
| 8150 | sec = sec->next) |
| 8151 | { |
| 8152 | bfd_vma size = sec->size; |
| 8153 | |
| 8154 | if (size == 0 && (sec->flags & SEC_HAS_CONTENTS) == 0) |
| 8155 | { |
| 8156 | struct bfd_link_order *o; |
| 8157 | |
| 8158 | for (o = sec->map_head.link_order; o != NULL; o = o->next) |
| 8159 | if (size < o->offset + o->size) |
| 8160 | size = o->offset + o->size; |
| 8161 | } |
| 8162 | end = sec->vma + size; |
| 8163 | } |
| 8164 | base = elf_hash_table (info)->tls_sec->vma; |
| 8165 | end = align_power (end, elf_hash_table (info)->tls_sec->alignment_power); |
| 8166 | elf_hash_table (info)->tls_size = end - base; |
| 8167 | } |
| 8168 | |
| 8169 | /* Reorder SHF_LINK_ORDER sections. */ |
| 8170 | for (o = abfd->sections; o != NULL; o = o->next) |
| 8171 | { |
| 8172 | if (!elf_fixup_link_order (abfd, o)) |
| 8173 | return FALSE; |
| 8174 | } |
| 8175 | |
| 8176 | /* Since ELF permits relocations to be against local symbols, we |
| 8177 | must have the local symbols available when we do the relocations. |
| 8178 | Since we would rather only read the local symbols once, and we |
| 8179 | would rather not keep them in memory, we handle all the |
| 8180 | relocations for a single input file at the same time. |
| 8181 | |
| 8182 | Unfortunately, there is no way to know the total number of local |
| 8183 | symbols until we have seen all of them, and the local symbol |
| 8184 | indices precede the global symbol indices. This means that when |
| 8185 | we are generating relocatable output, and we see a reloc against |
| 8186 | a global symbol, we can not know the symbol index until we have |
| 8187 | finished examining all the local symbols to see which ones we are |
| 8188 | going to output. To deal with this, we keep the relocations in |
| 8189 | memory, and don't output them until the end of the link. This is |
| 8190 | an unfortunate waste of memory, but I don't see a good way around |
| 8191 | it. Fortunately, it only happens when performing a relocatable |
| 8192 | link, which is not the common case. FIXME: If keep_memory is set |
| 8193 | we could write the relocs out and then read them again; I don't |
| 8194 | know how bad the memory loss will be. */ |
| 8195 | |
| 8196 | for (sub = info->input_bfds; sub != NULL; sub = sub->link_next) |
| 8197 | sub->output_has_begun = FALSE; |
| 8198 | for (o = abfd->sections; o != NULL; o = o->next) |
| 8199 | { |
| 8200 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 8201 | { |
| 8202 | if (p->type == bfd_indirect_link_order |
| 8203 | && (bfd_get_flavour ((sub = p->u.indirect.section->owner)) |
| 8204 | == bfd_target_elf_flavour) |
| 8205 | && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass) |
| 8206 | { |
| 8207 | if (! sub->output_has_begun) |
| 8208 | { |
| 8209 | if (! elf_link_input_bfd (&finfo, sub)) |
| 8210 | goto error_return; |
| 8211 | sub->output_has_begun = TRUE; |
| 8212 | } |
| 8213 | } |
| 8214 | else if (p->type == bfd_section_reloc_link_order |
| 8215 | || p->type == bfd_symbol_reloc_link_order) |
| 8216 | { |
| 8217 | if (! elf_reloc_link_order (abfd, info, o, p)) |
| 8218 | goto error_return; |
| 8219 | } |
| 8220 | else |
| 8221 | { |
| 8222 | if (! _bfd_default_link_order (abfd, info, o, p)) |
| 8223 | goto error_return; |
| 8224 | } |
| 8225 | } |
| 8226 | } |
| 8227 | |
| 8228 | /* Output any global symbols that got converted to local in a |
| 8229 | version script or due to symbol visibility. We do this in a |
| 8230 | separate step since ELF requires all local symbols to appear |
| 8231 | prior to any global symbols. FIXME: We should only do this if |
| 8232 | some global symbols were, in fact, converted to become local. |
| 8233 | FIXME: Will this work correctly with the Irix 5 linker? */ |
| 8234 | eoinfo.failed = FALSE; |
| 8235 | eoinfo.finfo = &finfo; |
| 8236 | eoinfo.localsyms = TRUE; |
| 8237 | elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym, |
| 8238 | &eoinfo); |
| 8239 | if (eoinfo.failed) |
| 8240 | return FALSE; |
| 8241 | |
| 8242 | /* That wrote out all the local symbols. Finish up the symbol table |
| 8243 | with the global symbols. Even if we want to strip everything we |
| 8244 | can, we still need to deal with those global symbols that got |
| 8245 | converted to local in a version script. */ |
| 8246 | |
| 8247 | /* The sh_info field records the index of the first non local symbol. */ |
| 8248 | symtab_hdr->sh_info = bfd_get_symcount (abfd); |
| 8249 | |
| 8250 | if (dynamic |
| 8251 | && finfo.dynsym_sec->output_section != bfd_abs_section_ptr) |
| 8252 | { |
| 8253 | Elf_Internal_Sym sym; |
| 8254 | bfd_byte *dynsym = finfo.dynsym_sec->contents; |
| 8255 | long last_local = 0; |
| 8256 | |
| 8257 | /* Write out the section symbols for the output sections. */ |
| 8258 | if (info->shared || elf_hash_table (info)->is_relocatable_executable) |
| 8259 | { |
| 8260 | asection *s; |
| 8261 | |
| 8262 | sym.st_size = 0; |
| 8263 | sym.st_name = 0; |
| 8264 | sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION); |
| 8265 | sym.st_other = 0; |
| 8266 | |
| 8267 | for (s = abfd->sections; s != NULL; s = s->next) |
| 8268 | { |
| 8269 | int indx; |
| 8270 | bfd_byte *dest; |
| 8271 | long dynindx; |
| 8272 | |
| 8273 | dynindx = elf_section_data (s)->dynindx; |
| 8274 | if (dynindx <= 0) |
| 8275 | continue; |
| 8276 | indx = elf_section_data (s)->this_idx; |
| 8277 | BFD_ASSERT (indx > 0); |
| 8278 | sym.st_shndx = indx; |
| 8279 | sym.st_value = s->vma; |
| 8280 | dest = dynsym + dynindx * bed->s->sizeof_sym; |
| 8281 | if (last_local < dynindx) |
| 8282 | last_local = dynindx; |
| 8283 | bed->s->swap_symbol_out (abfd, &sym, dest, 0); |
| 8284 | } |
| 8285 | } |
| 8286 | |
| 8287 | /* Write out the local dynsyms. */ |
| 8288 | if (elf_hash_table (info)->dynlocal) |
| 8289 | { |
| 8290 | struct elf_link_local_dynamic_entry *e; |
| 8291 | for (e = elf_hash_table (info)->dynlocal; e ; e = e->next) |
| 8292 | { |
| 8293 | asection *s; |
| 8294 | bfd_byte *dest; |
| 8295 | |
| 8296 | sym.st_size = e->isym.st_size; |
| 8297 | sym.st_other = e->isym.st_other; |
| 8298 | |
| 8299 | /* Copy the internal symbol as is. |
| 8300 | Note that we saved a word of storage and overwrote |
| 8301 | the original st_name with the dynstr_index. */ |
| 8302 | sym = e->isym; |
| 8303 | |
| 8304 | if (e->isym.st_shndx != SHN_UNDEF |
| 8305 | && (e->isym.st_shndx < SHN_LORESERVE |
| 8306 | || e->isym.st_shndx > SHN_HIRESERVE)) |
| 8307 | { |
| 8308 | s = bfd_section_from_elf_index (e->input_bfd, |
| 8309 | e->isym.st_shndx); |
| 8310 | |
| 8311 | sym.st_shndx = |
| 8312 | elf_section_data (s->output_section)->this_idx; |
| 8313 | sym.st_value = (s->output_section->vma |
| 8314 | + s->output_offset |
| 8315 | + e->isym.st_value); |
| 8316 | } |
| 8317 | |
| 8318 | if (last_local < e->dynindx) |
| 8319 | last_local = e->dynindx; |
| 8320 | |
| 8321 | dest = dynsym + e->dynindx * bed->s->sizeof_sym; |
| 8322 | bed->s->swap_symbol_out (abfd, &sym, dest, 0); |
| 8323 | } |
| 8324 | } |
| 8325 | |
| 8326 | elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info = |
| 8327 | last_local + 1; |
| 8328 | } |
| 8329 | |
| 8330 | /* We get the global symbols from the hash table. */ |
| 8331 | eoinfo.failed = FALSE; |
| 8332 | eoinfo.localsyms = FALSE; |
| 8333 | eoinfo.finfo = &finfo; |
| 8334 | elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym, |
| 8335 | &eoinfo); |
| 8336 | if (eoinfo.failed) |
| 8337 | return FALSE; |
| 8338 | |
| 8339 | /* If backend needs to output some symbols not present in the hash |
| 8340 | table, do it now. */ |
| 8341 | if (bed->elf_backend_output_arch_syms) |
| 8342 | { |
| 8343 | typedef bfd_boolean (*out_sym_func) |
| 8344 | (void *, const char *, Elf_Internal_Sym *, asection *, |
| 8345 | struct elf_link_hash_entry *); |
| 8346 | |
| 8347 | if (! ((*bed->elf_backend_output_arch_syms) |
| 8348 | (abfd, info, &finfo, (out_sym_func) elf_link_output_sym))) |
| 8349 | return FALSE; |
| 8350 | } |
| 8351 | |
| 8352 | /* Flush all symbols to the file. */ |
| 8353 | if (! elf_link_flush_output_syms (&finfo, bed)) |
| 8354 | return FALSE; |
| 8355 | |
| 8356 | /* Now we know the size of the symtab section. */ |
| 8357 | off += symtab_hdr->sh_size; |
| 8358 | |
| 8359 | symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr; |
| 8360 | if (symtab_shndx_hdr->sh_name != 0) |
| 8361 | { |
| 8362 | symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX; |
| 8363 | symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx); |
| 8364 | symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx); |
| 8365 | amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx); |
| 8366 | symtab_shndx_hdr->sh_size = amt; |
| 8367 | |
| 8368 | off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr, |
| 8369 | off, TRUE); |
| 8370 | |
| 8371 | if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0 |
| 8372 | || (bfd_bwrite (finfo.symshndxbuf, amt, abfd) != amt)) |
| 8373 | return FALSE; |
| 8374 | } |
| 8375 | |
| 8376 | |
| 8377 | /* Finish up and write out the symbol string table (.strtab) |
| 8378 | section. */ |
| 8379 | symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr; |
| 8380 | /* sh_name was set in prep_headers. */ |
| 8381 | symstrtab_hdr->sh_type = SHT_STRTAB; |
| 8382 | symstrtab_hdr->sh_flags = 0; |
| 8383 | symstrtab_hdr->sh_addr = 0; |
| 8384 | symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab); |
| 8385 | symstrtab_hdr->sh_entsize = 0; |
| 8386 | symstrtab_hdr->sh_link = 0; |
| 8387 | symstrtab_hdr->sh_info = 0; |
| 8388 | /* sh_offset is set just below. */ |
| 8389 | symstrtab_hdr->sh_addralign = 1; |
| 8390 | |
| 8391 | off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE); |
| 8392 | elf_tdata (abfd)->next_file_pos = off; |
| 8393 | |
| 8394 | if (bfd_get_symcount (abfd) > 0) |
| 8395 | { |
| 8396 | if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0 |
| 8397 | || ! _bfd_stringtab_emit (abfd, finfo.symstrtab)) |
| 8398 | return FALSE; |
| 8399 | } |
| 8400 | |
| 8401 | /* Adjust the relocs to have the correct symbol indices. */ |
| 8402 | for (o = abfd->sections; o != NULL; o = o->next) |
| 8403 | { |
| 8404 | if ((o->flags & SEC_RELOC) == 0) |
| 8405 | continue; |
| 8406 | |
| 8407 | elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr, |
| 8408 | elf_section_data (o)->rel_count, |
| 8409 | elf_section_data (o)->rel_hashes); |
| 8410 | if (elf_section_data (o)->rel_hdr2 != NULL) |
| 8411 | elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2, |
| 8412 | elf_section_data (o)->rel_count2, |
| 8413 | (elf_section_data (o)->rel_hashes |
| 8414 | + elf_section_data (o)->rel_count)); |
| 8415 | |
| 8416 | /* Set the reloc_count field to 0 to prevent write_relocs from |
| 8417 | trying to swap the relocs out itself. */ |
| 8418 | o->reloc_count = 0; |
| 8419 | } |
| 8420 | |
| 8421 | if (dynamic && info->combreloc && dynobj != NULL) |
| 8422 | relativecount = elf_link_sort_relocs (abfd, info, &reldyn); |
| 8423 | |
| 8424 | /* If we are linking against a dynamic object, or generating a |
| 8425 | shared library, finish up the dynamic linking information. */ |
| 8426 | if (dynamic) |
| 8427 | { |
| 8428 | bfd_byte *dyncon, *dynconend; |
| 8429 | |
| 8430 | /* Fix up .dynamic entries. */ |
| 8431 | o = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 8432 | BFD_ASSERT (o != NULL); |
| 8433 | |
| 8434 | dyncon = o->contents; |
| 8435 | dynconend = o->contents + o->size; |
| 8436 | for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn) |
| 8437 | { |
| 8438 | Elf_Internal_Dyn dyn; |
| 8439 | const char *name; |
| 8440 | unsigned int type; |
| 8441 | |
| 8442 | bed->s->swap_dyn_in (dynobj, dyncon, &dyn); |
| 8443 | |
| 8444 | switch (dyn.d_tag) |
| 8445 | { |
| 8446 | default: |
| 8447 | continue; |
| 8448 | case DT_NULL: |
| 8449 | if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend) |
| 8450 | { |
| 8451 | switch (elf_section_data (reldyn)->this_hdr.sh_type) |
| 8452 | { |
| 8453 | case SHT_REL: dyn.d_tag = DT_RELCOUNT; break; |
| 8454 | case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break; |
| 8455 | default: continue; |
| 8456 | } |
| 8457 | dyn.d_un.d_val = relativecount; |
| 8458 | relativecount = 0; |
| 8459 | break; |
| 8460 | } |
| 8461 | continue; |
| 8462 | |
| 8463 | case DT_INIT: |
| 8464 | name = info->init_function; |
| 8465 | goto get_sym; |
| 8466 | case DT_FINI: |
| 8467 | name = info->fini_function; |
| 8468 | get_sym: |
| 8469 | { |
| 8470 | struct elf_link_hash_entry *h; |
| 8471 | |
| 8472 | h = elf_link_hash_lookup (elf_hash_table (info), name, |
| 8473 | FALSE, FALSE, TRUE); |
| 8474 | if (h != NULL |
| 8475 | && (h->root.type == bfd_link_hash_defined |
| 8476 | || h->root.type == bfd_link_hash_defweak)) |
| 8477 | { |
| 8478 | dyn.d_un.d_val = h->root.u.def.value; |
| 8479 | o = h->root.u.def.section; |
| 8480 | if (o->output_section != NULL) |
| 8481 | dyn.d_un.d_val += (o->output_section->vma |
| 8482 | + o->output_offset); |
| 8483 | else |
| 8484 | { |
| 8485 | /* The symbol is imported from another shared |
| 8486 | library and does not apply to this one. */ |
| 8487 | dyn.d_un.d_val = 0; |
| 8488 | } |
| 8489 | break; |
| 8490 | } |
| 8491 | } |
| 8492 | continue; |
| 8493 | |
| 8494 | case DT_PREINIT_ARRAYSZ: |
| 8495 | name = ".preinit_array"; |
| 8496 | goto get_size; |
| 8497 | case DT_INIT_ARRAYSZ: |
| 8498 | name = ".init_array"; |
| 8499 | goto get_size; |
| 8500 | case DT_FINI_ARRAYSZ: |
| 8501 | name = ".fini_array"; |
| 8502 | get_size: |
| 8503 | o = bfd_get_section_by_name (abfd, name); |
| 8504 | if (o == NULL) |
| 8505 | { |
| 8506 | (*_bfd_error_handler) |
| 8507 | (_("%B: could not find output section %s"), abfd, name); |
| 8508 | goto error_return; |
| 8509 | } |
| 8510 | if (o->size == 0) |
| 8511 | (*_bfd_error_handler) |
| 8512 | (_("warning: %s section has zero size"), name); |
| 8513 | dyn.d_un.d_val = o->size; |
| 8514 | break; |
| 8515 | |
| 8516 | case DT_PREINIT_ARRAY: |
| 8517 | name = ".preinit_array"; |
| 8518 | goto get_vma; |
| 8519 | case DT_INIT_ARRAY: |
| 8520 | name = ".init_array"; |
| 8521 | goto get_vma; |
| 8522 | case DT_FINI_ARRAY: |
| 8523 | name = ".fini_array"; |
| 8524 | goto get_vma; |
| 8525 | |
| 8526 | case DT_HASH: |
| 8527 | name = ".hash"; |
| 8528 | goto get_vma; |
| 8529 | case DT_STRTAB: |
| 8530 | name = ".dynstr"; |
| 8531 | goto get_vma; |
| 8532 | case DT_SYMTAB: |
| 8533 | name = ".dynsym"; |
| 8534 | goto get_vma; |
| 8535 | case DT_VERDEF: |
| 8536 | name = ".gnu.version_d"; |
| 8537 | goto get_vma; |
| 8538 | case DT_VERNEED: |
| 8539 | name = ".gnu.version_r"; |
| 8540 | goto get_vma; |
| 8541 | case DT_VERSYM: |
| 8542 | name = ".gnu.version"; |
| 8543 | get_vma: |
| 8544 | o = bfd_get_section_by_name (abfd, name); |
| 8545 | if (o == NULL) |
| 8546 | { |
| 8547 | (*_bfd_error_handler) |
| 8548 | (_("%B: could not find output section %s"), abfd, name); |
| 8549 | goto error_return; |
| 8550 | } |
| 8551 | dyn.d_un.d_ptr = o->vma; |
| 8552 | break; |
| 8553 | |
| 8554 | case DT_REL: |
| 8555 | case DT_RELA: |
| 8556 | case DT_RELSZ: |
| 8557 | case DT_RELASZ: |
| 8558 | if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ) |
| 8559 | type = SHT_REL; |
| 8560 | else |
| 8561 | type = SHT_RELA; |
| 8562 | dyn.d_un.d_val = 0; |
| 8563 | for (i = 1; i < elf_numsections (abfd); i++) |
| 8564 | { |
| 8565 | Elf_Internal_Shdr *hdr; |
| 8566 | |
| 8567 | hdr = elf_elfsections (abfd)[i]; |
| 8568 | if (hdr->sh_type == type |
| 8569 | && (hdr->sh_flags & SHF_ALLOC) != 0) |
| 8570 | { |
| 8571 | if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ) |
| 8572 | dyn.d_un.d_val += hdr->sh_size; |
| 8573 | else |
| 8574 | { |
| 8575 | if (dyn.d_un.d_val == 0 |
| 8576 | || hdr->sh_addr < dyn.d_un.d_val) |
| 8577 | dyn.d_un.d_val = hdr->sh_addr; |
| 8578 | } |
| 8579 | } |
| 8580 | } |
| 8581 | break; |
| 8582 | } |
| 8583 | bed->s->swap_dyn_out (dynobj, &dyn, dyncon); |
| 8584 | } |
| 8585 | } |
| 8586 | |
| 8587 | /* If we have created any dynamic sections, then output them. */ |
| 8588 | if (dynobj != NULL) |
| 8589 | { |
| 8590 | if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info)) |
| 8591 | goto error_return; |
| 8592 | |
| 8593 | for (o = dynobj->sections; o != NULL; o = o->next) |
| 8594 | { |
| 8595 | if ((o->flags & SEC_HAS_CONTENTS) == 0 |
| 8596 | || o->size == 0 |
| 8597 | || o->output_section == bfd_abs_section_ptr) |
| 8598 | continue; |
| 8599 | if ((o->flags & SEC_LINKER_CREATED) == 0) |
| 8600 | { |
| 8601 | /* At this point, we are only interested in sections |
| 8602 | created by _bfd_elf_link_create_dynamic_sections. */ |
| 8603 | continue; |
| 8604 | } |
| 8605 | if (elf_hash_table (info)->stab_info.stabstr == o) |
| 8606 | continue; |
| 8607 | if (elf_hash_table (info)->eh_info.hdr_sec == o) |
| 8608 | continue; |
| 8609 | if ((elf_section_data (o->output_section)->this_hdr.sh_type |
| 8610 | != SHT_STRTAB) |
| 8611 | || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0) |
| 8612 | { |
| 8613 | if (! bfd_set_section_contents (abfd, o->output_section, |
| 8614 | o->contents, |
| 8615 | (file_ptr) o->output_offset, |
| 8616 | o->size)) |
| 8617 | goto error_return; |
| 8618 | } |
| 8619 | else |
| 8620 | { |
| 8621 | /* The contents of the .dynstr section are actually in a |
| 8622 | stringtab. */ |
| 8623 | off = elf_section_data (o->output_section)->this_hdr.sh_offset; |
| 8624 | if (bfd_seek (abfd, off, SEEK_SET) != 0 |
| 8625 | || ! _bfd_elf_strtab_emit (abfd, |
| 8626 | elf_hash_table (info)->dynstr)) |
| 8627 | goto error_return; |
| 8628 | } |
| 8629 | } |
| 8630 | } |
| 8631 | |
| 8632 | if (info->relocatable) |
| 8633 | { |
| 8634 | bfd_boolean failed = FALSE; |
| 8635 | |
| 8636 | bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed); |
| 8637 | if (failed) |
| 8638 | goto error_return; |
| 8639 | } |
| 8640 | |
| 8641 | /* If we have optimized stabs strings, output them. */ |
| 8642 | if (elf_hash_table (info)->stab_info.stabstr != NULL) |
| 8643 | { |
| 8644 | if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info)) |
| 8645 | goto error_return; |
| 8646 | } |
| 8647 | |
| 8648 | if (info->eh_frame_hdr) |
| 8649 | { |
| 8650 | if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info)) |
| 8651 | goto error_return; |
| 8652 | } |
| 8653 | |
| 8654 | if (finfo.symstrtab != NULL) |
| 8655 | _bfd_stringtab_free (finfo.symstrtab); |
| 8656 | if (finfo.contents != NULL) |
| 8657 | free (finfo.contents); |
| 8658 | if (finfo.external_relocs != NULL) |
| 8659 | free (finfo.external_relocs); |
| 8660 | if (finfo.internal_relocs != NULL) |
| 8661 | free (finfo.internal_relocs); |
| 8662 | if (finfo.external_syms != NULL) |
| 8663 | free (finfo.external_syms); |
| 8664 | if (finfo.locsym_shndx != NULL) |
| 8665 | free (finfo.locsym_shndx); |
| 8666 | if (finfo.internal_syms != NULL) |
| 8667 | free (finfo.internal_syms); |
| 8668 | if (finfo.indices != NULL) |
| 8669 | free (finfo.indices); |
| 8670 | if (finfo.sections != NULL) |
| 8671 | free (finfo.sections); |
| 8672 | if (finfo.symbuf != NULL) |
| 8673 | free (finfo.symbuf); |
| 8674 | if (finfo.symshndxbuf != NULL) |
| 8675 | free (finfo.symshndxbuf); |
| 8676 | for (o = abfd->sections; o != NULL; o = o->next) |
| 8677 | { |
| 8678 | if ((o->flags & SEC_RELOC) != 0 |
| 8679 | && elf_section_data (o)->rel_hashes != NULL) |
| 8680 | free (elf_section_data (o)->rel_hashes); |
| 8681 | } |
| 8682 | |
| 8683 | elf_tdata (abfd)->linker = TRUE; |
| 8684 | |
| 8685 | return TRUE; |
| 8686 | |
| 8687 | error_return: |
| 8688 | if (finfo.symstrtab != NULL) |
| 8689 | _bfd_stringtab_free (finfo.symstrtab); |
| 8690 | if (finfo.contents != NULL) |
| 8691 | free (finfo.contents); |
| 8692 | if (finfo.external_relocs != NULL) |
| 8693 | free (finfo.external_relocs); |
| 8694 | if (finfo.internal_relocs != NULL) |
| 8695 | free (finfo.internal_relocs); |
| 8696 | if (finfo.external_syms != NULL) |
| 8697 | free (finfo.external_syms); |
| 8698 | if (finfo.locsym_shndx != NULL) |
| 8699 | free (finfo.locsym_shndx); |
| 8700 | if (finfo.internal_syms != NULL) |
| 8701 | free (finfo.internal_syms); |
| 8702 | if (finfo.indices != NULL) |
| 8703 | free (finfo.indices); |
| 8704 | if (finfo.sections != NULL) |
| 8705 | free (finfo.sections); |
| 8706 | if (finfo.symbuf != NULL) |
| 8707 | free (finfo.symbuf); |
| 8708 | if (finfo.symshndxbuf != NULL) |
| 8709 | free (finfo.symshndxbuf); |
| 8710 | for (o = abfd->sections; o != NULL; o = o->next) |
| 8711 | { |
| 8712 | if ((o->flags & SEC_RELOC) != 0 |
| 8713 | && elf_section_data (o)->rel_hashes != NULL) |
| 8714 | free (elf_section_data (o)->rel_hashes); |
| 8715 | } |
| 8716 | |
| 8717 | return FALSE; |
| 8718 | } |
| 8719 | \f |
| 8720 | /* Garbage collect unused sections. */ |
| 8721 | |
| 8722 | /* The mark phase of garbage collection. For a given section, mark |
| 8723 | it and any sections in this section's group, and all the sections |
| 8724 | which define symbols to which it refers. */ |
| 8725 | |
| 8726 | typedef asection * (*gc_mark_hook_fn) |
| 8727 | (asection *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 8728 | struct elf_link_hash_entry *, Elf_Internal_Sym *); |
| 8729 | |
| 8730 | bfd_boolean |
| 8731 | _bfd_elf_gc_mark (struct bfd_link_info *info, |
| 8732 | asection *sec, |
| 8733 | gc_mark_hook_fn gc_mark_hook) |
| 8734 | { |
| 8735 | bfd_boolean ret; |
| 8736 | asection *group_sec; |
| 8737 | |
| 8738 | sec->gc_mark = 1; |
| 8739 | |
| 8740 | /* Mark all the sections in the group. */ |
| 8741 | group_sec = elf_section_data (sec)->next_in_group; |
| 8742 | if (group_sec && !group_sec->gc_mark) |
| 8743 | if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook)) |
| 8744 | return FALSE; |
| 8745 | |
| 8746 | /* Look through the section relocs. */ |
| 8747 | ret = TRUE; |
| 8748 | if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0) |
| 8749 | { |
| 8750 | Elf_Internal_Rela *relstart, *rel, *relend; |
| 8751 | Elf_Internal_Shdr *symtab_hdr; |
| 8752 | struct elf_link_hash_entry **sym_hashes; |
| 8753 | size_t nlocsyms; |
| 8754 | size_t extsymoff; |
| 8755 | bfd *input_bfd = sec->owner; |
| 8756 | const struct elf_backend_data *bed = get_elf_backend_data (input_bfd); |
| 8757 | Elf_Internal_Sym *isym = NULL; |
| 8758 | int r_sym_shift; |
| 8759 | |
| 8760 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 8761 | sym_hashes = elf_sym_hashes (input_bfd); |
| 8762 | |
| 8763 | /* Read the local symbols. */ |
| 8764 | if (elf_bad_symtab (input_bfd)) |
| 8765 | { |
| 8766 | nlocsyms = symtab_hdr->sh_size / bed->s->sizeof_sym; |
| 8767 | extsymoff = 0; |
| 8768 | } |
| 8769 | else |
| 8770 | extsymoff = nlocsyms = symtab_hdr->sh_info; |
| 8771 | |
| 8772 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 8773 | if (isym == NULL && nlocsyms != 0) |
| 8774 | { |
| 8775 | isym = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, nlocsyms, 0, |
| 8776 | NULL, NULL, NULL); |
| 8777 | if (isym == NULL) |
| 8778 | return FALSE; |
| 8779 | } |
| 8780 | |
| 8781 | /* Read the relocations. */ |
| 8782 | relstart = _bfd_elf_link_read_relocs (input_bfd, sec, NULL, NULL, |
| 8783 | info->keep_memory); |
| 8784 | if (relstart == NULL) |
| 8785 | { |
| 8786 | ret = FALSE; |
| 8787 | goto out1; |
| 8788 | } |
| 8789 | relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel; |
| 8790 | |
| 8791 | if (bed->s->arch_size == 32) |
| 8792 | r_sym_shift = 8; |
| 8793 | else |
| 8794 | r_sym_shift = 32; |
| 8795 | |
| 8796 | for (rel = relstart; rel < relend; rel++) |
| 8797 | { |
| 8798 | unsigned long r_symndx; |
| 8799 | asection *rsec; |
| 8800 | struct elf_link_hash_entry *h; |
| 8801 | |
| 8802 | r_symndx = rel->r_info >> r_sym_shift; |
| 8803 | if (r_symndx == 0) |
| 8804 | continue; |
| 8805 | |
| 8806 | if (r_symndx >= nlocsyms |
| 8807 | || ELF_ST_BIND (isym[r_symndx].st_info) != STB_LOCAL) |
| 8808 | { |
| 8809 | h = sym_hashes[r_symndx - extsymoff]; |
| 8810 | while (h->root.type == bfd_link_hash_indirect |
| 8811 | || h->root.type == bfd_link_hash_warning) |
| 8812 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 8813 | rsec = (*gc_mark_hook) (sec, info, rel, h, NULL); |
| 8814 | } |
| 8815 | else |
| 8816 | { |
| 8817 | rsec = (*gc_mark_hook) (sec, info, rel, NULL, &isym[r_symndx]); |
| 8818 | } |
| 8819 | |
| 8820 | if (rsec && !rsec->gc_mark) |
| 8821 | { |
| 8822 | if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour) |
| 8823 | rsec->gc_mark = 1; |
| 8824 | else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook)) |
| 8825 | { |
| 8826 | ret = FALSE; |
| 8827 | goto out2; |
| 8828 | } |
| 8829 | } |
| 8830 | } |
| 8831 | |
| 8832 | out2: |
| 8833 | if (elf_section_data (sec)->relocs != relstart) |
| 8834 | free (relstart); |
| 8835 | out1: |
| 8836 | if (isym != NULL && symtab_hdr->contents != (unsigned char *) isym) |
| 8837 | { |
| 8838 | if (! info->keep_memory) |
| 8839 | free (isym); |
| 8840 | else |
| 8841 | symtab_hdr->contents = (unsigned char *) isym; |
| 8842 | } |
| 8843 | } |
| 8844 | |
| 8845 | return ret; |
| 8846 | } |
| 8847 | |
| 8848 | /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */ |
| 8849 | |
| 8850 | static bfd_boolean |
| 8851 | elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *idxptr) |
| 8852 | { |
| 8853 | int *idx = idxptr; |
| 8854 | |
| 8855 | if (h->root.type == bfd_link_hash_warning) |
| 8856 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 8857 | |
| 8858 | if (h->dynindx != -1 |
| 8859 | && ((h->root.type != bfd_link_hash_defined |
| 8860 | && h->root.type != bfd_link_hash_defweak) |
| 8861 | || h->root.u.def.section->gc_mark)) |
| 8862 | h->dynindx = (*idx)++; |
| 8863 | |
| 8864 | return TRUE; |
| 8865 | } |
| 8866 | |
| 8867 | /* The sweep phase of garbage collection. Remove all garbage sections. */ |
| 8868 | |
| 8869 | typedef bfd_boolean (*gc_sweep_hook_fn) |
| 8870 | (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *); |
| 8871 | |
| 8872 | static bfd_boolean |
| 8873 | elf_gc_sweep (struct bfd_link_info *info, gc_sweep_hook_fn gc_sweep_hook) |
| 8874 | { |
| 8875 | bfd *sub; |
| 8876 | |
| 8877 | for (sub = info->input_bfds; sub != NULL; sub = sub->link_next) |
| 8878 | { |
| 8879 | asection *o; |
| 8880 | |
| 8881 | if (bfd_get_flavour (sub) != bfd_target_elf_flavour) |
| 8882 | continue; |
| 8883 | |
| 8884 | for (o = sub->sections; o != NULL; o = o->next) |
| 8885 | { |
| 8886 | /* Keep debug and special sections. */ |
| 8887 | if ((o->flags & (SEC_DEBUGGING | SEC_LINKER_CREATED)) != 0 |
| 8888 | || (o->flags & (SEC_ALLOC | SEC_LOAD)) == 0) |
| 8889 | o->gc_mark = 1; |
| 8890 | |
| 8891 | if (o->gc_mark) |
| 8892 | continue; |
| 8893 | |
| 8894 | /* Skip sweeping sections already excluded. */ |
| 8895 | if (o->flags & SEC_EXCLUDE) |
| 8896 | continue; |
| 8897 | |
| 8898 | /* Since this is early in the link process, it is simple |
| 8899 | to remove a section from the output. */ |
| 8900 | o->flags |= SEC_EXCLUDE; |
| 8901 | |
| 8902 | /* But we also have to update some of the relocation |
| 8903 | info we collected before. */ |
| 8904 | if (gc_sweep_hook |
| 8905 | && (o->flags & SEC_RELOC) && o->reloc_count > 0) |
| 8906 | { |
| 8907 | Elf_Internal_Rela *internal_relocs; |
| 8908 | bfd_boolean r; |
| 8909 | |
| 8910 | internal_relocs |
| 8911 | = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL, |
| 8912 | info->keep_memory); |
| 8913 | if (internal_relocs == NULL) |
| 8914 | return FALSE; |
| 8915 | |
| 8916 | r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs); |
| 8917 | |
| 8918 | if (elf_section_data (o)->relocs != internal_relocs) |
| 8919 | free (internal_relocs); |
| 8920 | |
| 8921 | if (!r) |
| 8922 | return FALSE; |
| 8923 | } |
| 8924 | } |
| 8925 | } |
| 8926 | |
| 8927 | /* Remove the symbols that were in the swept sections from the dynamic |
| 8928 | symbol table. GCFIXME: Anyone know how to get them out of the |
| 8929 | static symbol table as well? */ |
| 8930 | { |
| 8931 | int i = 0; |
| 8932 | |
| 8933 | elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol, &i); |
| 8934 | |
| 8935 | elf_hash_table (info)->dynsymcount = i; |
| 8936 | } |
| 8937 | |
| 8938 | return TRUE; |
| 8939 | } |
| 8940 | |
| 8941 | /* Propagate collected vtable information. This is called through |
| 8942 | elf_link_hash_traverse. */ |
| 8943 | |
| 8944 | static bfd_boolean |
| 8945 | elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp) |
| 8946 | { |
| 8947 | if (h->root.type == bfd_link_hash_warning) |
| 8948 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 8949 | |
| 8950 | /* Those that are not vtables. */ |
| 8951 | if (h->vtable == NULL || h->vtable->parent == NULL) |
| 8952 | return TRUE; |
| 8953 | |
| 8954 | /* Those vtables that do not have parents, we cannot merge. */ |
| 8955 | if (h->vtable->parent == (struct elf_link_hash_entry *) -1) |
| 8956 | return TRUE; |
| 8957 | |
| 8958 | /* If we've already been done, exit. */ |
| 8959 | if (h->vtable->used && h->vtable->used[-1]) |
| 8960 | return TRUE; |
| 8961 | |
| 8962 | /* Make sure the parent's table is up to date. */ |
| 8963 | elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp); |
| 8964 | |
| 8965 | if (h->vtable->used == NULL) |
| 8966 | { |
| 8967 | /* None of this table's entries were referenced. Re-use the |
| 8968 | parent's table. */ |
| 8969 | h->vtable->used = h->vtable->parent->vtable->used; |
| 8970 | h->vtable->size = h->vtable->parent->vtable->size; |
| 8971 | } |
| 8972 | else |
| 8973 | { |
| 8974 | size_t n; |
| 8975 | bfd_boolean *cu, *pu; |
| 8976 | |
| 8977 | /* Or the parent's entries into ours. */ |
| 8978 | cu = h->vtable->used; |
| 8979 | cu[-1] = TRUE; |
| 8980 | pu = h->vtable->parent->vtable->used; |
| 8981 | if (pu != NULL) |
| 8982 | { |
| 8983 | const struct elf_backend_data *bed; |
| 8984 | unsigned int log_file_align; |
| 8985 | |
| 8986 | bed = get_elf_backend_data (h->root.u.def.section->owner); |
| 8987 | log_file_align = bed->s->log_file_align; |
| 8988 | n = h->vtable->parent->vtable->size >> log_file_align; |
| 8989 | while (n--) |
| 8990 | { |
| 8991 | if (*pu) |
| 8992 | *cu = TRUE; |
| 8993 | pu++; |
| 8994 | cu++; |
| 8995 | } |
| 8996 | } |
| 8997 | } |
| 8998 | |
| 8999 | return TRUE; |
| 9000 | } |
| 9001 | |
| 9002 | static bfd_boolean |
| 9003 | elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp) |
| 9004 | { |
| 9005 | asection *sec; |
| 9006 | bfd_vma hstart, hend; |
| 9007 | Elf_Internal_Rela *relstart, *relend, *rel; |
| 9008 | const struct elf_backend_data *bed; |
| 9009 | unsigned int log_file_align; |
| 9010 | |
| 9011 | if (h->root.type == bfd_link_hash_warning) |
| 9012 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 9013 | |
| 9014 | /* Take care of both those symbols that do not describe vtables as |
| 9015 | well as those that are not loaded. */ |
| 9016 | if (h->vtable == NULL || h->vtable->parent == NULL) |
| 9017 | return TRUE; |
| 9018 | |
| 9019 | BFD_ASSERT (h->root.type == bfd_link_hash_defined |
| 9020 | || h->root.type == bfd_link_hash_defweak); |
| 9021 | |
| 9022 | sec = h->root.u.def.section; |
| 9023 | hstart = h->root.u.def.value; |
| 9024 | hend = hstart + h->size; |
| 9025 | |
| 9026 | relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE); |
| 9027 | if (!relstart) |
| 9028 | return *(bfd_boolean *) okp = FALSE; |
| 9029 | bed = get_elf_backend_data (sec->owner); |
| 9030 | log_file_align = bed->s->log_file_align; |
| 9031 | |
| 9032 | relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel; |
| 9033 | |
| 9034 | for (rel = relstart; rel < relend; ++rel) |
| 9035 | if (rel->r_offset >= hstart && rel->r_offset < hend) |
| 9036 | { |
| 9037 | /* If the entry is in use, do nothing. */ |
| 9038 | if (h->vtable->used |
| 9039 | && (rel->r_offset - hstart) < h->vtable->size) |
| 9040 | { |
| 9041 | bfd_vma entry = (rel->r_offset - hstart) >> log_file_align; |
| 9042 | if (h->vtable->used[entry]) |
| 9043 | continue; |
| 9044 | } |
| 9045 | /* Otherwise, kill it. */ |
| 9046 | rel->r_offset = rel->r_info = rel->r_addend = 0; |
| 9047 | } |
| 9048 | |
| 9049 | return TRUE; |
| 9050 | } |
| 9051 | |
| 9052 | /* Mark sections containing dynamically referenced symbols. This is called |
| 9053 | through elf_link_hash_traverse. */ |
| 9054 | |
| 9055 | static bfd_boolean |
| 9056 | elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, |
| 9057 | void *okp ATTRIBUTE_UNUSED) |
| 9058 | { |
| 9059 | if (h->root.type == bfd_link_hash_warning) |
| 9060 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 9061 | |
| 9062 | if ((h->root.type == bfd_link_hash_defined |
| 9063 | || h->root.type == bfd_link_hash_defweak) |
| 9064 | && h->ref_dynamic) |
| 9065 | h->root.u.def.section->flags |= SEC_KEEP; |
| 9066 | |
| 9067 | return TRUE; |
| 9068 | } |
| 9069 | |
| 9070 | /* Do mark and sweep of unused sections. */ |
| 9071 | |
| 9072 | bfd_boolean |
| 9073 | bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info) |
| 9074 | { |
| 9075 | bfd_boolean ok = TRUE; |
| 9076 | bfd *sub; |
| 9077 | asection * (*gc_mark_hook) |
| 9078 | (asection *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 9079 | struct elf_link_hash_entry *h, Elf_Internal_Sym *); |
| 9080 | |
| 9081 | if (!info->gc_sections) |
| 9082 | return bfd_generic_gc_sections (abfd, info); |
| 9083 | |
| 9084 | if (!get_elf_backend_data (abfd)->can_gc_sections |
| 9085 | || info->relocatable |
| 9086 | || info->emitrelocations |
| 9087 | || info->shared |
| 9088 | || !is_elf_hash_table (info->hash)) |
| 9089 | { |
| 9090 | (*_bfd_error_handler)(_("Warning: gc-sections option ignored")); |
| 9091 | return TRUE; |
| 9092 | } |
| 9093 | |
| 9094 | /* Apply transitive closure to the vtable entry usage info. */ |
| 9095 | elf_link_hash_traverse (elf_hash_table (info), |
| 9096 | elf_gc_propagate_vtable_entries_used, |
| 9097 | &ok); |
| 9098 | if (!ok) |
| 9099 | return FALSE; |
| 9100 | |
| 9101 | /* Kill the vtable relocations that were not used. */ |
| 9102 | elf_link_hash_traverse (elf_hash_table (info), |
| 9103 | elf_gc_smash_unused_vtentry_relocs, |
| 9104 | &ok); |
| 9105 | if (!ok) |
| 9106 | return FALSE; |
| 9107 | |
| 9108 | /* Mark dynamically referenced symbols. */ |
| 9109 | if (elf_hash_table (info)->dynamic_sections_created) |
| 9110 | elf_link_hash_traverse (elf_hash_table (info), |
| 9111 | elf_gc_mark_dynamic_ref_symbol, |
| 9112 | &ok); |
| 9113 | if (!ok) |
| 9114 | return FALSE; |
| 9115 | |
| 9116 | /* Grovel through relocs to find out who stays ... */ |
| 9117 | gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook; |
| 9118 | for (sub = info->input_bfds; sub != NULL; sub = sub->link_next) |
| 9119 | { |
| 9120 | asection *o; |
| 9121 | |
| 9122 | if (bfd_get_flavour (sub) != bfd_target_elf_flavour) |
| 9123 | continue; |
| 9124 | |
| 9125 | for (o = sub->sections; o != NULL; o = o->next) |
| 9126 | { |
| 9127 | if (o->flags & SEC_KEEP) |
| 9128 | { |
| 9129 | /* _bfd_elf_discard_section_eh_frame knows how to discard |
| 9130 | orphaned FDEs so don't mark sections referenced by the |
| 9131 | EH frame section. */ |
| 9132 | if (strcmp (o->name, ".eh_frame") == 0) |
| 9133 | o->gc_mark = 1; |
| 9134 | else if (!_bfd_elf_gc_mark (info, o, gc_mark_hook)) |
| 9135 | return FALSE; |
| 9136 | } |
| 9137 | } |
| 9138 | } |
| 9139 | |
| 9140 | /* ... and mark SEC_EXCLUDE for those that go. */ |
| 9141 | if (!elf_gc_sweep (info, get_elf_backend_data (abfd)->gc_sweep_hook)) |
| 9142 | return FALSE; |
| 9143 | |
| 9144 | return TRUE; |
| 9145 | } |
| 9146 | \f |
| 9147 | /* Called from check_relocs to record the existence of a VTINHERIT reloc. */ |
| 9148 | |
| 9149 | bfd_boolean |
| 9150 | bfd_elf_gc_record_vtinherit (bfd *abfd, |
| 9151 | asection *sec, |
| 9152 | struct elf_link_hash_entry *h, |
| 9153 | bfd_vma offset) |
| 9154 | { |
| 9155 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; |
| 9156 | struct elf_link_hash_entry **search, *child; |
| 9157 | bfd_size_type extsymcount; |
| 9158 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 9159 | |
| 9160 | /* The sh_info field of the symtab header tells us where the |
| 9161 | external symbols start. We don't care about the local symbols at |
| 9162 | this point. */ |
| 9163 | extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym; |
| 9164 | if (!elf_bad_symtab (abfd)) |
| 9165 | extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info; |
| 9166 | |
| 9167 | sym_hashes = elf_sym_hashes (abfd); |
| 9168 | sym_hashes_end = sym_hashes + extsymcount; |
| 9169 | |
| 9170 | /* Hunt down the child symbol, which is in this section at the same |
| 9171 | offset as the relocation. */ |
| 9172 | for (search = sym_hashes; search != sym_hashes_end; ++search) |
| 9173 | { |
| 9174 | if ((child = *search) != NULL |
| 9175 | && (child->root.type == bfd_link_hash_defined |
| 9176 | || child->root.type == bfd_link_hash_defweak) |
| 9177 | && child->root.u.def.section == sec |
| 9178 | && child->root.u.def.value == offset) |
| 9179 | goto win; |
| 9180 | } |
| 9181 | |
| 9182 | (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT", |
| 9183 | abfd, sec, (unsigned long) offset); |
| 9184 | bfd_set_error (bfd_error_invalid_operation); |
| 9185 | return FALSE; |
| 9186 | |
| 9187 | win: |
| 9188 | if (!child->vtable) |
| 9189 | { |
| 9190 | child->vtable = bfd_zalloc (abfd, sizeof (*child->vtable)); |
| 9191 | if (!child->vtable) |
| 9192 | return FALSE; |
| 9193 | } |
| 9194 | if (!h) |
| 9195 | { |
| 9196 | /* This *should* only be the absolute section. It could potentially |
| 9197 | be that someone has defined a non-global vtable though, which |
| 9198 | would be bad. It isn't worth paging in the local symbols to be |
| 9199 | sure though; that case should simply be handled by the assembler. */ |
| 9200 | |
| 9201 | child->vtable->parent = (struct elf_link_hash_entry *) -1; |
| 9202 | } |
| 9203 | else |
| 9204 | child->vtable->parent = h; |
| 9205 | |
| 9206 | return TRUE; |
| 9207 | } |
| 9208 | |
| 9209 | /* Called from check_relocs to record the existence of a VTENTRY reloc. */ |
| 9210 | |
| 9211 | bfd_boolean |
| 9212 | bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED, |
| 9213 | asection *sec ATTRIBUTE_UNUSED, |
| 9214 | struct elf_link_hash_entry *h, |
| 9215 | bfd_vma addend) |
| 9216 | { |
| 9217 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 9218 | unsigned int log_file_align = bed->s->log_file_align; |
| 9219 | |
| 9220 | if (!h->vtable) |
| 9221 | { |
| 9222 | h->vtable = bfd_zalloc (abfd, sizeof (*h->vtable)); |
| 9223 | if (!h->vtable) |
| 9224 | return FALSE; |
| 9225 | } |
| 9226 | |
| 9227 | if (addend >= h->vtable->size) |
| 9228 | { |
| 9229 | size_t size, bytes, file_align; |
| 9230 | bfd_boolean *ptr = h->vtable->used; |
| 9231 | |
| 9232 | /* While the symbol is undefined, we have to be prepared to handle |
| 9233 | a zero size. */ |
| 9234 | file_align = 1 << log_file_align; |
| 9235 | if (h->root.type == bfd_link_hash_undefined) |
| 9236 | size = addend + file_align; |
| 9237 | else |
| 9238 | { |
| 9239 | size = h->size; |
| 9240 | if (addend >= size) |
| 9241 | { |
| 9242 | /* Oops! We've got a reference past the defined end of |
| 9243 | the table. This is probably a bug -- shall we warn? */ |
| 9244 | size = addend + file_align; |
| 9245 | } |
| 9246 | } |
| 9247 | size = (size + file_align - 1) & -file_align; |
| 9248 | |
| 9249 | /* Allocate one extra entry for use as a "done" flag for the |
| 9250 | consolidation pass. */ |
| 9251 | bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean); |
| 9252 | |
| 9253 | if (ptr) |
| 9254 | { |
| 9255 | ptr = bfd_realloc (ptr - 1, bytes); |
| 9256 | |
| 9257 | if (ptr != NULL) |
| 9258 | { |
| 9259 | size_t oldbytes; |
| 9260 | |
| 9261 | oldbytes = (((h->vtable->size >> log_file_align) + 1) |
| 9262 | * sizeof (bfd_boolean)); |
| 9263 | memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes); |
| 9264 | } |
| 9265 | } |
| 9266 | else |
| 9267 | ptr = bfd_zmalloc (bytes); |
| 9268 | |
| 9269 | if (ptr == NULL) |
| 9270 | return FALSE; |
| 9271 | |
| 9272 | /* And arrange for that done flag to be at index -1. */ |
| 9273 | h->vtable->used = ptr + 1; |
| 9274 | h->vtable->size = size; |
| 9275 | } |
| 9276 | |
| 9277 | h->vtable->used[addend >> log_file_align] = TRUE; |
| 9278 | |
| 9279 | return TRUE; |
| 9280 | } |
| 9281 | |
| 9282 | struct alloc_got_off_arg { |
| 9283 | bfd_vma gotoff; |
| 9284 | unsigned int got_elt_size; |
| 9285 | }; |
| 9286 | |
| 9287 | /* We need a special top-level link routine to convert got reference counts |
| 9288 | to real got offsets. */ |
| 9289 | |
| 9290 | static bfd_boolean |
| 9291 | elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg) |
| 9292 | { |
| 9293 | struct alloc_got_off_arg *gofarg = arg; |
| 9294 | |
| 9295 | if (h->root.type == bfd_link_hash_warning) |
| 9296 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 9297 | |
| 9298 | if (h->got.refcount > 0) |
| 9299 | { |
| 9300 | h->got.offset = gofarg->gotoff; |
| 9301 | gofarg->gotoff += gofarg->got_elt_size; |
| 9302 | } |
| 9303 | else |
| 9304 | h->got.offset = (bfd_vma) -1; |
| 9305 | |
| 9306 | return TRUE; |
| 9307 | } |
| 9308 | |
| 9309 | /* And an accompanying bit to work out final got entry offsets once |
| 9310 | we're done. Should be called from final_link. */ |
| 9311 | |
| 9312 | bfd_boolean |
| 9313 | bfd_elf_gc_common_finalize_got_offsets (bfd *abfd, |
| 9314 | struct bfd_link_info *info) |
| 9315 | { |
| 9316 | bfd *i; |
| 9317 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 9318 | bfd_vma gotoff; |
| 9319 | unsigned int got_elt_size = bed->s->arch_size / 8; |
| 9320 | struct alloc_got_off_arg gofarg; |
| 9321 | |
| 9322 | if (! is_elf_hash_table (info->hash)) |
| 9323 | return FALSE; |
| 9324 | |
| 9325 | /* The GOT offset is relative to the .got section, but the GOT header is |
| 9326 | put into the .got.plt section, if the backend uses it. */ |
| 9327 | if (bed->want_got_plt) |
| 9328 | gotoff = 0; |
| 9329 | else |
| 9330 | gotoff = bed->got_header_size; |
| 9331 | |
| 9332 | /* Do the local .got entries first. */ |
| 9333 | for (i = info->input_bfds; i; i = i->link_next) |
| 9334 | { |
| 9335 | bfd_signed_vma *local_got; |
| 9336 | bfd_size_type j, locsymcount; |
| 9337 | Elf_Internal_Shdr *symtab_hdr; |
| 9338 | |
| 9339 | if (bfd_get_flavour (i) != bfd_target_elf_flavour) |
| 9340 | continue; |
| 9341 | |
| 9342 | local_got = elf_local_got_refcounts (i); |
| 9343 | if (!local_got) |
| 9344 | continue; |
| 9345 | |
| 9346 | symtab_hdr = &elf_tdata (i)->symtab_hdr; |
| 9347 | if (elf_bad_symtab (i)) |
| 9348 | locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym; |
| 9349 | else |
| 9350 | locsymcount = symtab_hdr->sh_info; |
| 9351 | |
| 9352 | for (j = 0; j < locsymcount; ++j) |
| 9353 | { |
| 9354 | if (local_got[j] > 0) |
| 9355 | { |
| 9356 | local_got[j] = gotoff; |
| 9357 | gotoff += got_elt_size; |
| 9358 | } |
| 9359 | else |
| 9360 | local_got[j] = (bfd_vma) -1; |
| 9361 | } |
| 9362 | } |
| 9363 | |
| 9364 | /* Then the global .got entries. .plt refcounts are handled by |
| 9365 | adjust_dynamic_symbol */ |
| 9366 | gofarg.gotoff = gotoff; |
| 9367 | gofarg.got_elt_size = got_elt_size; |
| 9368 | elf_link_hash_traverse (elf_hash_table (info), |
| 9369 | elf_gc_allocate_got_offsets, |
| 9370 | &gofarg); |
| 9371 | return TRUE; |
| 9372 | } |
| 9373 | |
| 9374 | /* Many folk need no more in the way of final link than this, once |
| 9375 | got entry reference counting is enabled. */ |
| 9376 | |
| 9377 | bfd_boolean |
| 9378 | bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info) |
| 9379 | { |
| 9380 | if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info)) |
| 9381 | return FALSE; |
| 9382 | |
| 9383 | /* Invoke the regular ELF backend linker to do all the work. */ |
| 9384 | return bfd_elf_final_link (abfd, info); |
| 9385 | } |
| 9386 | |
| 9387 | bfd_boolean |
| 9388 | bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie) |
| 9389 | { |
| 9390 | struct elf_reloc_cookie *rcookie = cookie; |
| 9391 | |
| 9392 | if (rcookie->bad_symtab) |
| 9393 | rcookie->rel = rcookie->rels; |
| 9394 | |
| 9395 | for (; rcookie->rel < rcookie->relend; rcookie->rel++) |
| 9396 | { |
| 9397 | unsigned long r_symndx; |
| 9398 | |
| 9399 | if (! rcookie->bad_symtab) |
| 9400 | if (rcookie->rel->r_offset > offset) |
| 9401 | return FALSE; |
| 9402 | if (rcookie->rel->r_offset != offset) |
| 9403 | continue; |
| 9404 | |
| 9405 | r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift; |
| 9406 | if (r_symndx == SHN_UNDEF) |
| 9407 | return TRUE; |
| 9408 | |
| 9409 | if (r_symndx >= rcookie->locsymcount |
| 9410 | || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL) |
| 9411 | { |
| 9412 | struct elf_link_hash_entry *h; |
| 9413 | |
| 9414 | h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff]; |
| 9415 | |
| 9416 | while (h->root.type == bfd_link_hash_indirect |
| 9417 | || h->root.type == bfd_link_hash_warning) |
| 9418 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 9419 | |
| 9420 | if ((h->root.type == bfd_link_hash_defined |
| 9421 | || h->root.type == bfd_link_hash_defweak) |
| 9422 | && elf_discarded_section (h->root.u.def.section)) |
| 9423 | return TRUE; |
| 9424 | else |
| 9425 | return FALSE; |
| 9426 | } |
| 9427 | else |
| 9428 | { |
| 9429 | /* It's not a relocation against a global symbol, |
| 9430 | but it could be a relocation against a local |
| 9431 | symbol for a discarded section. */ |
| 9432 | asection *isec; |
| 9433 | Elf_Internal_Sym *isym; |
| 9434 | |
| 9435 | /* Need to: get the symbol; get the section. */ |
| 9436 | isym = &rcookie->locsyms[r_symndx]; |
| 9437 | if (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE) |
| 9438 | { |
| 9439 | isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx); |
| 9440 | if (isec != NULL && elf_discarded_section (isec)) |
| 9441 | return TRUE; |
| 9442 | } |
| 9443 | } |
| 9444 | return FALSE; |
| 9445 | } |
| 9446 | return FALSE; |
| 9447 | } |
| 9448 | |
| 9449 | /* Discard unneeded references to discarded sections. |
| 9450 | Returns TRUE if any section's size was changed. */ |
| 9451 | /* This function assumes that the relocations are in sorted order, |
| 9452 | which is true for all known assemblers. */ |
| 9453 | |
| 9454 | bfd_boolean |
| 9455 | bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info) |
| 9456 | { |
| 9457 | struct elf_reloc_cookie cookie; |
| 9458 | asection *stab, *eh; |
| 9459 | Elf_Internal_Shdr *symtab_hdr; |
| 9460 | const struct elf_backend_data *bed; |
| 9461 | bfd *abfd; |
| 9462 | unsigned int count; |
| 9463 | bfd_boolean ret = FALSE; |
| 9464 | |
| 9465 | if (info->traditional_format |
| 9466 | || !is_elf_hash_table (info->hash)) |
| 9467 | return FALSE; |
| 9468 | |
| 9469 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next) |
| 9470 | { |
| 9471 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) |
| 9472 | continue; |
| 9473 | |
| 9474 | bed = get_elf_backend_data (abfd); |
| 9475 | |
| 9476 | if ((abfd->flags & DYNAMIC) != 0) |
| 9477 | continue; |
| 9478 | |
| 9479 | eh = bfd_get_section_by_name (abfd, ".eh_frame"); |
| 9480 | if (info->relocatable |
| 9481 | || (eh != NULL |
| 9482 | && (eh->size == 0 |
| 9483 | || bfd_is_abs_section (eh->output_section)))) |
| 9484 | eh = NULL; |
| 9485 | |
| 9486 | stab = bfd_get_section_by_name (abfd, ".stab"); |
| 9487 | if (stab != NULL |
| 9488 | && (stab->size == 0 |
| 9489 | || bfd_is_abs_section (stab->output_section) |
| 9490 | || stab->sec_info_type != ELF_INFO_TYPE_STABS)) |
| 9491 | stab = NULL; |
| 9492 | |
| 9493 | if (stab == NULL |
| 9494 | && eh == NULL |
| 9495 | && bed->elf_backend_discard_info == NULL) |
| 9496 | continue; |
| 9497 | |
| 9498 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 9499 | cookie.abfd = abfd; |
| 9500 | cookie.sym_hashes = elf_sym_hashes (abfd); |
| 9501 | cookie.bad_symtab = elf_bad_symtab (abfd); |
| 9502 | if (cookie.bad_symtab) |
| 9503 | { |
| 9504 | cookie.locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym; |
| 9505 | cookie.extsymoff = 0; |
| 9506 | } |
| 9507 | else |
| 9508 | { |
| 9509 | cookie.locsymcount = symtab_hdr->sh_info; |
| 9510 | cookie.extsymoff = symtab_hdr->sh_info; |
| 9511 | } |
| 9512 | |
| 9513 | if (bed->s->arch_size == 32) |
| 9514 | cookie.r_sym_shift = 8; |
| 9515 | else |
| 9516 | cookie.r_sym_shift = 32; |
| 9517 | |
| 9518 | cookie.locsyms = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 9519 | if (cookie.locsyms == NULL && cookie.locsymcount != 0) |
| 9520 | { |
| 9521 | cookie.locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 9522 | cookie.locsymcount, 0, |
| 9523 | NULL, NULL, NULL); |
| 9524 | if (cookie.locsyms == NULL) |
| 9525 | return FALSE; |
| 9526 | } |
| 9527 | |
| 9528 | if (stab != NULL) |
| 9529 | { |
| 9530 | cookie.rels = NULL; |
| 9531 | count = stab->reloc_count; |
| 9532 | if (count != 0) |
| 9533 | cookie.rels = _bfd_elf_link_read_relocs (abfd, stab, NULL, NULL, |
| 9534 | info->keep_memory); |
| 9535 | if (cookie.rels != NULL) |
| 9536 | { |
| 9537 | cookie.rel = cookie.rels; |
| 9538 | cookie.relend = cookie.rels; |
| 9539 | cookie.relend += count * bed->s->int_rels_per_ext_rel; |
| 9540 | if (_bfd_discard_section_stabs (abfd, stab, |
| 9541 | elf_section_data (stab)->sec_info, |
| 9542 | bfd_elf_reloc_symbol_deleted_p, |
| 9543 | &cookie)) |
| 9544 | ret = TRUE; |
| 9545 | if (elf_section_data (stab)->relocs != cookie.rels) |
| 9546 | free (cookie.rels); |
| 9547 | } |
| 9548 | } |
| 9549 | |
| 9550 | if (eh != NULL) |
| 9551 | { |
| 9552 | cookie.rels = NULL; |
| 9553 | count = eh->reloc_count; |
| 9554 | if (count != 0) |
| 9555 | cookie.rels = _bfd_elf_link_read_relocs (abfd, eh, NULL, NULL, |
| 9556 | info->keep_memory); |
| 9557 | cookie.rel = cookie.rels; |
| 9558 | cookie.relend = cookie.rels; |
| 9559 | if (cookie.rels != NULL) |
| 9560 | cookie.relend += count * bed->s->int_rels_per_ext_rel; |
| 9561 | |
| 9562 | if (_bfd_elf_discard_section_eh_frame (abfd, info, eh, |
| 9563 | bfd_elf_reloc_symbol_deleted_p, |
| 9564 | &cookie)) |
| 9565 | ret = TRUE; |
| 9566 | |
| 9567 | if (cookie.rels != NULL |
| 9568 | && elf_section_data (eh)->relocs != cookie.rels) |
| 9569 | free (cookie.rels); |
| 9570 | } |
| 9571 | |
| 9572 | if (bed->elf_backend_discard_info != NULL |
| 9573 | && (*bed->elf_backend_discard_info) (abfd, &cookie, info)) |
| 9574 | ret = TRUE; |
| 9575 | |
| 9576 | if (cookie.locsyms != NULL |
| 9577 | && symtab_hdr->contents != (unsigned char *) cookie.locsyms) |
| 9578 | { |
| 9579 | if (! info->keep_memory) |
| 9580 | free (cookie.locsyms); |
| 9581 | else |
| 9582 | symtab_hdr->contents = (unsigned char *) cookie.locsyms; |
| 9583 | } |
| 9584 | } |
| 9585 | |
| 9586 | if (info->eh_frame_hdr |
| 9587 | && !info->relocatable |
| 9588 | && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info)) |
| 9589 | ret = TRUE; |
| 9590 | |
| 9591 | return ret; |
| 9592 | } |
| 9593 | |
| 9594 | void |
| 9595 | _bfd_elf_section_already_linked (bfd *abfd, struct bfd_section * sec) |
| 9596 | { |
| 9597 | flagword flags; |
| 9598 | const char *name, *p; |
| 9599 | struct bfd_section_already_linked *l; |
| 9600 | struct bfd_section_already_linked_hash_entry *already_linked_list; |
| 9601 | asection *group; |
| 9602 | |
| 9603 | /* A single member comdat group section may be discarded by a |
| 9604 | linkonce section. See below. */ |
| 9605 | if (sec->output_section == bfd_abs_section_ptr) |
| 9606 | return; |
| 9607 | |
| 9608 | flags = sec->flags; |
| 9609 | |
| 9610 | /* Check if it belongs to a section group. */ |
| 9611 | group = elf_sec_group (sec); |
| 9612 | |
| 9613 | /* Return if it isn't a linkonce section nor a member of a group. A |
| 9614 | comdat group section also has SEC_LINK_ONCE set. */ |
| 9615 | if ((flags & SEC_LINK_ONCE) == 0 && group == NULL) |
| 9616 | return; |
| 9617 | |
| 9618 | if (group) |
| 9619 | { |
| 9620 | /* If this is the member of a single member comdat group, check if |
| 9621 | the group should be discarded. */ |
| 9622 | if (elf_next_in_group (sec) == sec |
| 9623 | && (group->flags & SEC_LINK_ONCE) != 0) |
| 9624 | sec = group; |
| 9625 | else |
| 9626 | return; |
| 9627 | } |
| 9628 | |
| 9629 | /* FIXME: When doing a relocatable link, we may have trouble |
| 9630 | copying relocations in other sections that refer to local symbols |
| 9631 | in the section being discarded. Those relocations will have to |
| 9632 | be converted somehow; as of this writing I'm not sure that any of |
| 9633 | the backends handle that correctly. |
| 9634 | |
| 9635 | It is tempting to instead not discard link once sections when |
| 9636 | doing a relocatable link (technically, they should be discarded |
| 9637 | whenever we are building constructors). However, that fails, |
| 9638 | because the linker winds up combining all the link once sections |
| 9639 | into a single large link once section, which defeats the purpose |
| 9640 | of having link once sections in the first place. |
| 9641 | |
| 9642 | Also, not merging link once sections in a relocatable link |
| 9643 | causes trouble for MIPS ELF, which relies on link once semantics |
| 9644 | to handle the .reginfo section correctly. */ |
| 9645 | |
| 9646 | name = bfd_get_section_name (abfd, sec); |
| 9647 | |
| 9648 | if (strncmp (name, ".gnu.linkonce.", sizeof (".gnu.linkonce.") - 1) == 0 |
| 9649 | && (p = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL) |
| 9650 | p++; |
| 9651 | else |
| 9652 | p = name; |
| 9653 | |
| 9654 | already_linked_list = bfd_section_already_linked_table_lookup (p); |
| 9655 | |
| 9656 | for (l = already_linked_list->entry; l != NULL; l = l->next) |
| 9657 | { |
| 9658 | /* We may have 3 different sections on the list: group section, |
| 9659 | comdat section and linkonce section. SEC may be a linkonce or |
| 9660 | group section. We match a group section with a group section, |
| 9661 | a linkonce section with a linkonce section, and ignore comdat |
| 9662 | section. */ |
| 9663 | if ((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP) |
| 9664 | && strcmp (name, l->sec->name) == 0 |
| 9665 | && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL) |
| 9666 | { |
| 9667 | /* The section has already been linked. See if we should |
| 9668 | issue a warning. */ |
| 9669 | switch (flags & SEC_LINK_DUPLICATES) |
| 9670 | { |
| 9671 | default: |
| 9672 | abort (); |
| 9673 | |
| 9674 | case SEC_LINK_DUPLICATES_DISCARD: |
| 9675 | break; |
| 9676 | |
| 9677 | case SEC_LINK_DUPLICATES_ONE_ONLY: |
| 9678 | (*_bfd_error_handler) |
| 9679 | (_("%B: ignoring duplicate section `%A'"), |
| 9680 | abfd, sec); |
| 9681 | break; |
| 9682 | |
| 9683 | case SEC_LINK_DUPLICATES_SAME_SIZE: |
| 9684 | if (sec->size != l->sec->size) |
| 9685 | (*_bfd_error_handler) |
| 9686 | (_("%B: duplicate section `%A' has different size"), |
| 9687 | abfd, sec); |
| 9688 | break; |
| 9689 | |
| 9690 | case SEC_LINK_DUPLICATES_SAME_CONTENTS: |
| 9691 | if (sec->size != l->sec->size) |
| 9692 | (*_bfd_error_handler) |
| 9693 | (_("%B: duplicate section `%A' has different size"), |
| 9694 | abfd, sec); |
| 9695 | else if (sec->size != 0) |
| 9696 | { |
| 9697 | bfd_byte *sec_contents, *l_sec_contents; |
| 9698 | |
| 9699 | if (!bfd_malloc_and_get_section (abfd, sec, &sec_contents)) |
| 9700 | (*_bfd_error_handler) |
| 9701 | (_("%B: warning: could not read contents of section `%A'"), |
| 9702 | abfd, sec); |
| 9703 | else if (!bfd_malloc_and_get_section (l->sec->owner, l->sec, |
| 9704 | &l_sec_contents)) |
| 9705 | (*_bfd_error_handler) |
| 9706 | (_("%B: warning: could not read contents of section `%A'"), |
| 9707 | l->sec->owner, l->sec); |
| 9708 | else if (memcmp (sec_contents, l_sec_contents, sec->size) != 0) |
| 9709 | (*_bfd_error_handler) |
| 9710 | (_("%B: warning: duplicate section `%A' has different contents"), |
| 9711 | abfd, sec); |
| 9712 | |
| 9713 | if (sec_contents) |
| 9714 | free (sec_contents); |
| 9715 | if (l_sec_contents) |
| 9716 | free (l_sec_contents); |
| 9717 | } |
| 9718 | break; |
| 9719 | } |
| 9720 | |
| 9721 | /* Set the output_section field so that lang_add_section |
| 9722 | does not create a lang_input_section structure for this |
| 9723 | section. Since there might be a symbol in the section |
| 9724 | being discarded, we must retain a pointer to the section |
| 9725 | which we are really going to use. */ |
| 9726 | sec->output_section = bfd_abs_section_ptr; |
| 9727 | sec->kept_section = l->sec; |
| 9728 | |
| 9729 | if (flags & SEC_GROUP) |
| 9730 | { |
| 9731 | asection *first = elf_next_in_group (sec); |
| 9732 | asection *s = first; |
| 9733 | |
| 9734 | while (s != NULL) |
| 9735 | { |
| 9736 | s->output_section = bfd_abs_section_ptr; |
| 9737 | /* Record which group discards it. */ |
| 9738 | s->kept_section = l->sec; |
| 9739 | s = elf_next_in_group (s); |
| 9740 | /* These lists are circular. */ |
| 9741 | if (s == first) |
| 9742 | break; |
| 9743 | } |
| 9744 | } |
| 9745 | |
| 9746 | return; |
| 9747 | } |
| 9748 | } |
| 9749 | |
| 9750 | if (group) |
| 9751 | { |
| 9752 | /* If this is the member of a single member comdat group and the |
| 9753 | group hasn't be discarded, we check if it matches a linkonce |
| 9754 | section. We only record the discarded comdat group. Otherwise |
| 9755 | the undiscarded group will be discarded incorrectly later since |
| 9756 | itself has been recorded. */ |
| 9757 | for (l = already_linked_list->entry; l != NULL; l = l->next) |
| 9758 | if ((l->sec->flags & SEC_GROUP) == 0 |
| 9759 | && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL |
| 9760 | && bfd_elf_match_symbols_in_sections (l->sec, |
| 9761 | elf_next_in_group (sec))) |
| 9762 | { |
| 9763 | elf_next_in_group (sec)->output_section = bfd_abs_section_ptr; |
| 9764 | elf_next_in_group (sec)->kept_section = l->sec; |
| 9765 | group->output_section = bfd_abs_section_ptr; |
| 9766 | break; |
| 9767 | } |
| 9768 | if (l == NULL) |
| 9769 | return; |
| 9770 | } |
| 9771 | else |
| 9772 | /* There is no direct match. But for linkonce section, we should |
| 9773 | check if there is a match with comdat group member. We always |
| 9774 | record the linkonce section, discarded or not. */ |
| 9775 | for (l = already_linked_list->entry; l != NULL; l = l->next) |
| 9776 | if (l->sec->flags & SEC_GROUP) |
| 9777 | { |
| 9778 | asection *first = elf_next_in_group (l->sec); |
| 9779 | |
| 9780 | if (first != NULL |
| 9781 | && elf_next_in_group (first) == first |
| 9782 | && bfd_elf_match_symbols_in_sections (first, sec)) |
| 9783 | { |
| 9784 | sec->output_section = bfd_abs_section_ptr; |
| 9785 | sec->kept_section = l->sec; |
| 9786 | break; |
| 9787 | } |
| 9788 | } |
| 9789 | |
| 9790 | /* This is the first section with this name. Record it. */ |
| 9791 | bfd_section_already_linked_table_insert (already_linked_list, sec); |
| 9792 | } |
| 9793 | |
| 9794 | static void |
| 9795 | bfd_elf_set_symbol (struct elf_link_hash_entry *h, bfd_vma val) |
| 9796 | { |
| 9797 | h->root.type = bfd_link_hash_defined; |
| 9798 | h->root.u.def.section = bfd_abs_section_ptr; |
| 9799 | h->root.u.def.value = val; |
| 9800 | h->def_regular = 1; |
| 9801 | h->type = STT_OBJECT; |
| 9802 | h->other = STV_HIDDEN | (h->other & ~ ELF_ST_VISIBILITY (-1)); |
| 9803 | h->forced_local = 1; |
| 9804 | } |
| 9805 | |
| 9806 | /* Set NAME to VAL if the symbol exists and is undefined. */ |
| 9807 | |
| 9808 | void |
| 9809 | _bfd_elf_provide_symbol (struct bfd_link_info *info, const char *name, |
| 9810 | bfd_vma val) |
| 9811 | { |
| 9812 | struct elf_link_hash_entry *h; |
| 9813 | |
| 9814 | h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, |
| 9815 | FALSE); |
| 9816 | if (h != NULL && (h->root.type == bfd_link_hash_undefined |
| 9817 | || h->root.type == bfd_link_hash_undefweak)) |
| 9818 | bfd_elf_set_symbol (h, val); |
| 9819 | } |
| 9820 | |
| 9821 | /* Set START and END to boundaries of SEC if they exist and are |
| 9822 | undefined. */ |
| 9823 | |
| 9824 | void |
| 9825 | _bfd_elf_provide_section_bound_symbols (struct bfd_link_info *info, |
| 9826 | asection *sec, |
| 9827 | const char *start, |
| 9828 | const char *end) |
| 9829 | { |
| 9830 | struct elf_link_hash_entry *hs, *he; |
| 9831 | bfd_vma start_val, end_val; |
| 9832 | bfd_boolean do_start, do_end; |
| 9833 | |
| 9834 | /* Check if we need them or not first. */ |
| 9835 | hs = elf_link_hash_lookup (elf_hash_table (info), start, FALSE, |
| 9836 | FALSE, FALSE); |
| 9837 | do_start = (hs != NULL |
| 9838 | && (hs->root.type == bfd_link_hash_undefined |
| 9839 | || hs->root.type == bfd_link_hash_undefweak)); |
| 9840 | |
| 9841 | he = elf_link_hash_lookup (elf_hash_table (info), end, FALSE, |
| 9842 | FALSE, FALSE); |
| 9843 | do_end = (he != NULL |
| 9844 | && (he->root.type == bfd_link_hash_undefined |
| 9845 | || he->root.type == bfd_link_hash_undefweak)); |
| 9846 | |
| 9847 | if (!do_start && !do_end) |
| 9848 | return; |
| 9849 | |
| 9850 | if (sec != NULL) |
| 9851 | { |
| 9852 | start_val = sec->vma; |
| 9853 | end_val = start_val + sec->size; |
| 9854 | } |
| 9855 | else |
| 9856 | { |
| 9857 | /* We have to choose those values very carefully. Some targets, |
| 9858 | like alpha, may have relocation overflow with 0. "__bss_start" |
| 9859 | should be defined in all cases. */ |
| 9860 | struct elf_link_hash_entry *h |
| 9861 | = elf_link_hash_lookup (elf_hash_table (info), "__bss_start", |
| 9862 | FALSE, FALSE, FALSE); |
| 9863 | if (h != NULL && h->root.type == bfd_link_hash_defined) |
| 9864 | start_val = h->root.u.def.value; |
| 9865 | else |
| 9866 | start_val = 0; |
| 9867 | end_val = start_val; |
| 9868 | } |
| 9869 | |
| 9870 | if (do_start) |
| 9871 | bfd_elf_set_symbol (hs, start_val); |
| 9872 | |
| 9873 | if (do_end) |
| 9874 | bfd_elf_set_symbol (he, end_val); |
| 9875 | } |