| 1 | /* ELF object file format |
| 2 | Copyright (C) 1992-2016 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GAS, the GNU Assembler. |
| 5 | |
| 6 | GAS is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as |
| 8 | published by the Free Software Foundation; either version 3, |
| 9 | or (at your option) any later version. |
| 10 | |
| 11 | GAS is distributed in the hope that it will be useful, but |
| 12 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 14 | the GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GAS; see the file COPYING. If not, write to the Free |
| 18 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 19 | 02110-1301, USA. */ |
| 20 | |
| 21 | #define OBJ_HEADER "obj-elf.h" |
| 22 | #include "as.h" |
| 23 | #include "safe-ctype.h" |
| 24 | #include "subsegs.h" |
| 25 | #include "obstack.h" |
| 26 | #include "struc-symbol.h" |
| 27 | #include "dwarf2dbg.h" |
| 28 | |
| 29 | #ifndef ECOFF_DEBUGGING |
| 30 | #define ECOFF_DEBUGGING 0 |
| 31 | #else |
| 32 | #define NEED_ECOFF_DEBUG |
| 33 | #endif |
| 34 | |
| 35 | #ifdef NEED_ECOFF_DEBUG |
| 36 | #include "ecoff.h" |
| 37 | #endif |
| 38 | |
| 39 | #ifdef TC_ALPHA |
| 40 | #include "elf/alpha.h" |
| 41 | #endif |
| 42 | |
| 43 | #ifdef TC_MIPS |
| 44 | #include "elf/mips.h" |
| 45 | #endif |
| 46 | |
| 47 | #ifdef TC_PPC |
| 48 | #include "elf/ppc.h" |
| 49 | #endif |
| 50 | |
| 51 | #ifdef TC_I370 |
| 52 | #include "elf/i370.h" |
| 53 | #endif |
| 54 | |
| 55 | #ifdef TC_I386 |
| 56 | #include "elf/x86-64.h" |
| 57 | #endif |
| 58 | |
| 59 | #ifdef TC_MEP |
| 60 | #include "elf/mep.h" |
| 61 | #endif |
| 62 | |
| 63 | #ifdef TC_NIOS2 |
| 64 | #include "elf/nios2.h" |
| 65 | #endif |
| 66 | |
| 67 | static void obj_elf_line (int); |
| 68 | static void obj_elf_size (int); |
| 69 | static void obj_elf_type (int); |
| 70 | static void obj_elf_ident (int); |
| 71 | static void obj_elf_weak (int); |
| 72 | static void obj_elf_local (int); |
| 73 | static void obj_elf_visibility (int); |
| 74 | static void obj_elf_symver (int); |
| 75 | static void obj_elf_subsection (int); |
| 76 | static void obj_elf_popsection (int); |
| 77 | static void obj_elf_gnu_attribute (int); |
| 78 | static void obj_elf_tls_common (int); |
| 79 | static void obj_elf_lcomm (int); |
| 80 | static void obj_elf_struct (int); |
| 81 | |
| 82 | static const pseudo_typeS elf_pseudo_table[] = |
| 83 | { |
| 84 | {"comm", obj_elf_common, 0}, |
| 85 | {"common", obj_elf_common, 1}, |
| 86 | {"ident", obj_elf_ident, 0}, |
| 87 | {"lcomm", obj_elf_lcomm, 0}, |
| 88 | {"local", obj_elf_local, 0}, |
| 89 | {"previous", obj_elf_previous, 0}, |
| 90 | {"section", obj_elf_section, 0}, |
| 91 | {"section.s", obj_elf_section, 0}, |
| 92 | {"sect", obj_elf_section, 0}, |
| 93 | {"sect.s", obj_elf_section, 0}, |
| 94 | {"pushsection", obj_elf_section, 1}, |
| 95 | {"popsection", obj_elf_popsection, 0}, |
| 96 | {"size", obj_elf_size, 0}, |
| 97 | {"type", obj_elf_type, 0}, |
| 98 | {"version", obj_elf_version, 0}, |
| 99 | {"weak", obj_elf_weak, 0}, |
| 100 | |
| 101 | /* These define symbol visibility. */ |
| 102 | {"internal", obj_elf_visibility, STV_INTERNAL}, |
| 103 | {"hidden", obj_elf_visibility, STV_HIDDEN}, |
| 104 | {"protected", obj_elf_visibility, STV_PROTECTED}, |
| 105 | |
| 106 | /* These are used for stabs-in-elf configurations. */ |
| 107 | {"line", obj_elf_line, 0}, |
| 108 | |
| 109 | /* This is a GNU extension to handle symbol versions. */ |
| 110 | {"symver", obj_elf_symver, 0}, |
| 111 | |
| 112 | /* A GNU extension to change subsection only. */ |
| 113 | {"subsection", obj_elf_subsection, 0}, |
| 114 | |
| 115 | /* These are GNU extensions to aid in garbage collecting C++ vtables. */ |
| 116 | {"vtable_inherit", (void (*) (int)) &obj_elf_vtable_inherit, 0}, |
| 117 | {"vtable_entry", (void (*) (int)) &obj_elf_vtable_entry, 0}, |
| 118 | |
| 119 | /* A GNU extension for object attributes. */ |
| 120 | {"gnu_attribute", obj_elf_gnu_attribute, 0}, |
| 121 | |
| 122 | /* These are used for dwarf. */ |
| 123 | {"2byte", cons, 2}, |
| 124 | {"4byte", cons, 4}, |
| 125 | {"8byte", cons, 8}, |
| 126 | /* These are used for dwarf2. */ |
| 127 | { "file", (void (*) (int)) dwarf2_directive_file, 0 }, |
| 128 | { "loc", dwarf2_directive_loc, 0 }, |
| 129 | { "loc_mark_labels", dwarf2_directive_loc_mark_labels, 0 }, |
| 130 | |
| 131 | /* We need to trap the section changing calls to handle .previous. */ |
| 132 | {"data", obj_elf_data, 0}, |
| 133 | {"offset", obj_elf_struct, 0}, |
| 134 | {"struct", obj_elf_struct, 0}, |
| 135 | {"text", obj_elf_text, 0}, |
| 136 | |
| 137 | {"tls_common", obj_elf_tls_common, 0}, |
| 138 | |
| 139 | /* End sentinel. */ |
| 140 | {NULL, NULL, 0}, |
| 141 | }; |
| 142 | |
| 143 | static const pseudo_typeS ecoff_debug_pseudo_table[] = |
| 144 | { |
| 145 | #ifdef NEED_ECOFF_DEBUG |
| 146 | /* COFF style debugging information for ECOFF. .ln is not used; .loc |
| 147 | is used instead. */ |
| 148 | { "def", ecoff_directive_def, 0 }, |
| 149 | { "dim", ecoff_directive_dim, 0 }, |
| 150 | { "endef", ecoff_directive_endef, 0 }, |
| 151 | { "file", ecoff_directive_file, 0 }, |
| 152 | { "scl", ecoff_directive_scl, 0 }, |
| 153 | { "tag", ecoff_directive_tag, 0 }, |
| 154 | { "val", ecoff_directive_val, 0 }, |
| 155 | |
| 156 | /* COFF debugging requires pseudo-ops .size and .type, but ELF |
| 157 | already has meanings for those. We use .esize and .etype |
| 158 | instead. These are only generated by gcc anyhow. */ |
| 159 | { "esize", ecoff_directive_size, 0 }, |
| 160 | { "etype", ecoff_directive_type, 0 }, |
| 161 | |
| 162 | /* ECOFF specific debugging information. */ |
| 163 | { "begin", ecoff_directive_begin, 0 }, |
| 164 | { "bend", ecoff_directive_bend, 0 }, |
| 165 | { "end", ecoff_directive_end, 0 }, |
| 166 | { "ent", ecoff_directive_ent, 0 }, |
| 167 | { "fmask", ecoff_directive_fmask, 0 }, |
| 168 | { "frame", ecoff_directive_frame, 0 }, |
| 169 | { "loc", ecoff_directive_loc, 0 }, |
| 170 | { "mask", ecoff_directive_mask, 0 }, |
| 171 | |
| 172 | /* Other ECOFF directives. */ |
| 173 | { "extern", ecoff_directive_extern, 0 }, |
| 174 | |
| 175 | /* These are used on Irix. I don't know how to implement them. */ |
| 176 | { "alias", s_ignore, 0 }, |
| 177 | { "bgnb", s_ignore, 0 }, |
| 178 | { "endb", s_ignore, 0 }, |
| 179 | { "lab", s_ignore, 0 }, |
| 180 | { "noalias", s_ignore, 0 }, |
| 181 | { "verstamp", s_ignore, 0 }, |
| 182 | { "vreg", s_ignore, 0 }, |
| 183 | #endif |
| 184 | |
| 185 | {NULL, NULL, 0} /* end sentinel */ |
| 186 | }; |
| 187 | |
| 188 | #undef NO_RELOC |
| 189 | #include "aout/aout64.h" |
| 190 | |
| 191 | /* This is called when the assembler starts. */ |
| 192 | |
| 193 | asection *elf_com_section_ptr; |
| 194 | |
| 195 | void |
| 196 | elf_begin (void) |
| 197 | { |
| 198 | asection *s; |
| 199 | |
| 200 | /* Add symbols for the known sections to the symbol table. */ |
| 201 | s = bfd_get_section_by_name (stdoutput, TEXT_SECTION_NAME); |
| 202 | symbol_table_insert (section_symbol (s)); |
| 203 | s = bfd_get_section_by_name (stdoutput, DATA_SECTION_NAME); |
| 204 | symbol_table_insert (section_symbol (s)); |
| 205 | s = bfd_get_section_by_name (stdoutput, BSS_SECTION_NAME); |
| 206 | symbol_table_insert (section_symbol (s)); |
| 207 | elf_com_section_ptr = bfd_com_section_ptr; |
| 208 | } |
| 209 | |
| 210 | void |
| 211 | elf_pop_insert (void) |
| 212 | { |
| 213 | pop_insert (elf_pseudo_table); |
| 214 | if (ECOFF_DEBUGGING) |
| 215 | pop_insert (ecoff_debug_pseudo_table); |
| 216 | } |
| 217 | |
| 218 | static bfd_vma |
| 219 | elf_s_get_size (symbolS *sym) |
| 220 | { |
| 221 | return S_GET_SIZE (sym); |
| 222 | } |
| 223 | |
| 224 | static void |
| 225 | elf_s_set_size (symbolS *sym, bfd_vma sz) |
| 226 | { |
| 227 | S_SET_SIZE (sym, sz); |
| 228 | } |
| 229 | |
| 230 | static bfd_vma |
| 231 | elf_s_get_align (symbolS *sym) |
| 232 | { |
| 233 | return S_GET_ALIGN (sym); |
| 234 | } |
| 235 | |
| 236 | static void |
| 237 | elf_s_set_align (symbolS *sym, bfd_vma align) |
| 238 | { |
| 239 | S_SET_ALIGN (sym, align); |
| 240 | } |
| 241 | |
| 242 | int |
| 243 | elf_s_get_other (symbolS *sym) |
| 244 | { |
| 245 | return elf_symbol (symbol_get_bfdsym (sym))->internal_elf_sym.st_other; |
| 246 | } |
| 247 | |
| 248 | static void |
| 249 | elf_s_set_other (symbolS *sym, int other) |
| 250 | { |
| 251 | S_SET_OTHER (sym, other); |
| 252 | } |
| 253 | |
| 254 | static int |
| 255 | elf_sec_sym_ok_for_reloc (asection *sec) |
| 256 | { |
| 257 | return obj_sec_sym_ok_for_reloc (sec); |
| 258 | } |
| 259 | |
| 260 | void |
| 261 | elf_file_symbol (const char *s, int appfile) |
| 262 | { |
| 263 | if (!appfile |
| 264 | || symbol_rootP == NULL |
| 265 | || symbol_rootP->bsym == NULL |
| 266 | || (symbol_rootP->bsym->flags & BSF_FILE) == 0) |
| 267 | { |
| 268 | symbolS *sym; |
| 269 | size_t name_length; |
| 270 | |
| 271 | sym = symbol_new (s, absolute_section, 0, NULL); |
| 272 | symbol_set_frag (sym, &zero_address_frag); |
| 273 | |
| 274 | name_length = strlen (s); |
| 275 | if (name_length > strlen (S_GET_NAME (sym))) |
| 276 | { |
| 277 | obstack_grow (¬es, s, name_length + 1); |
| 278 | S_SET_NAME (sym, (const char *) obstack_finish (¬es)); |
| 279 | } |
| 280 | else |
| 281 | strcpy ((char *) S_GET_NAME (sym), s); |
| 282 | |
| 283 | symbol_get_bfdsym (sym)->flags |= BSF_FILE; |
| 284 | |
| 285 | if (symbol_rootP != sym |
| 286 | && (symbol_rootP->bsym == NULL |
| 287 | || !(symbol_rootP->bsym->flags & BSF_FILE))) |
| 288 | { |
| 289 | symbol_remove (sym, &symbol_rootP, &symbol_lastP); |
| 290 | symbol_insert (sym, symbol_rootP, &symbol_rootP, &symbol_lastP); |
| 291 | } |
| 292 | |
| 293 | #ifdef DEBUG |
| 294 | verify_symbol_chain (symbol_rootP, symbol_lastP); |
| 295 | #endif |
| 296 | } |
| 297 | |
| 298 | #ifdef NEED_ECOFF_DEBUG |
| 299 | ecoff_new_file (s, appfile); |
| 300 | #endif |
| 301 | } |
| 302 | |
| 303 | /* Called from read.c:s_comm after we've parsed .comm symbol, size. |
| 304 | Parse a possible alignment value. */ |
| 305 | |
| 306 | symbolS * |
| 307 | elf_common_parse (int ignore ATTRIBUTE_UNUSED, symbolS *symbolP, addressT size) |
| 308 | { |
| 309 | addressT align = 0; |
| 310 | int is_local = symbol_get_obj (symbolP)->local; |
| 311 | |
| 312 | if (*input_line_pointer == ',') |
| 313 | { |
| 314 | char *save = input_line_pointer; |
| 315 | |
| 316 | input_line_pointer++; |
| 317 | SKIP_WHITESPACE (); |
| 318 | |
| 319 | if (*input_line_pointer == '"') |
| 320 | { |
| 321 | /* For sparc. Accept .common symbol, length, "bss" */ |
| 322 | input_line_pointer++; |
| 323 | /* Some use the dot, some don't. */ |
| 324 | if (*input_line_pointer == '.') |
| 325 | input_line_pointer++; |
| 326 | /* Some say data, some say bss. */ |
| 327 | if (strncmp (input_line_pointer, "bss\"", 4) == 0) |
| 328 | input_line_pointer += 4; |
| 329 | else if (strncmp (input_line_pointer, "data\"", 5) == 0) |
| 330 | input_line_pointer += 5; |
| 331 | else |
| 332 | { |
| 333 | char *p = input_line_pointer; |
| 334 | char c; |
| 335 | |
| 336 | while (*--p != '"') |
| 337 | ; |
| 338 | while (!is_end_of_line[(unsigned char) *input_line_pointer]) |
| 339 | if (*input_line_pointer++ == '"') |
| 340 | break; |
| 341 | c = *input_line_pointer; |
| 342 | *input_line_pointer = '\0'; |
| 343 | as_bad (_("bad .common segment %s"), p); |
| 344 | *input_line_pointer = c; |
| 345 | ignore_rest_of_line (); |
| 346 | return NULL; |
| 347 | } |
| 348 | /* ??? Don't ask me why these are always global. */ |
| 349 | is_local = 0; |
| 350 | } |
| 351 | else |
| 352 | { |
| 353 | input_line_pointer = save; |
| 354 | align = parse_align (is_local); |
| 355 | if (align == (addressT) -1) |
| 356 | return NULL; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | if (is_local) |
| 361 | { |
| 362 | bss_alloc (symbolP, size, align); |
| 363 | S_CLEAR_EXTERNAL (symbolP); |
| 364 | } |
| 365 | else |
| 366 | { |
| 367 | S_SET_VALUE (symbolP, size); |
| 368 | S_SET_ALIGN (symbolP, align); |
| 369 | S_SET_EXTERNAL (symbolP); |
| 370 | S_SET_SEGMENT (symbolP, elf_com_section_ptr); |
| 371 | } |
| 372 | |
| 373 | symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT; |
| 374 | |
| 375 | return symbolP; |
| 376 | } |
| 377 | |
| 378 | void |
| 379 | obj_elf_common (int is_common) |
| 380 | { |
| 381 | if (flag_mri && is_common) |
| 382 | s_mri_common (0); |
| 383 | else |
| 384 | s_comm_internal (0, elf_common_parse); |
| 385 | } |
| 386 | |
| 387 | static void |
| 388 | obj_elf_tls_common (int ignore ATTRIBUTE_UNUSED) |
| 389 | { |
| 390 | symbolS *symbolP = s_comm_internal (0, elf_common_parse); |
| 391 | |
| 392 | if (symbolP) |
| 393 | symbol_get_bfdsym (symbolP)->flags |= BSF_THREAD_LOCAL; |
| 394 | } |
| 395 | |
| 396 | static void |
| 397 | obj_elf_lcomm (int ignore ATTRIBUTE_UNUSED) |
| 398 | { |
| 399 | symbolS *symbolP = s_comm_internal (0, s_lcomm_internal); |
| 400 | |
| 401 | if (symbolP) |
| 402 | symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT; |
| 403 | } |
| 404 | |
| 405 | static symbolS * |
| 406 | get_sym_from_input_line_and_check (void) |
| 407 | { |
| 408 | char *name; |
| 409 | char c; |
| 410 | symbolS *sym; |
| 411 | |
| 412 | c = get_symbol_name (& name); |
| 413 | sym = symbol_find_or_make (name); |
| 414 | *input_line_pointer = c; |
| 415 | SKIP_WHITESPACE_AFTER_NAME (); |
| 416 | |
| 417 | /* There is no symbol name if input_line_pointer has not moved. */ |
| 418 | if (name == input_line_pointer) |
| 419 | as_bad (_("Missing symbol name in directive")); |
| 420 | return sym; |
| 421 | } |
| 422 | |
| 423 | static void |
| 424 | obj_elf_local (int ignore ATTRIBUTE_UNUSED) |
| 425 | { |
| 426 | int c; |
| 427 | symbolS *symbolP; |
| 428 | |
| 429 | do |
| 430 | { |
| 431 | symbolP = get_sym_from_input_line_and_check (); |
| 432 | c = *input_line_pointer; |
| 433 | S_CLEAR_EXTERNAL (symbolP); |
| 434 | symbol_get_obj (symbolP)->local = 1; |
| 435 | if (c == ',') |
| 436 | { |
| 437 | input_line_pointer++; |
| 438 | SKIP_WHITESPACE (); |
| 439 | if (*input_line_pointer == '\n') |
| 440 | c = '\n'; |
| 441 | } |
| 442 | } |
| 443 | while (c == ','); |
| 444 | demand_empty_rest_of_line (); |
| 445 | } |
| 446 | |
| 447 | static void |
| 448 | obj_elf_weak (int ignore ATTRIBUTE_UNUSED) |
| 449 | { |
| 450 | int c; |
| 451 | symbolS *symbolP; |
| 452 | |
| 453 | do |
| 454 | { |
| 455 | symbolP = get_sym_from_input_line_and_check (); |
| 456 | c = *input_line_pointer; |
| 457 | S_SET_WEAK (symbolP); |
| 458 | if (c == ',') |
| 459 | { |
| 460 | input_line_pointer++; |
| 461 | SKIP_WHITESPACE (); |
| 462 | if (*input_line_pointer == '\n') |
| 463 | c = '\n'; |
| 464 | } |
| 465 | } |
| 466 | while (c == ','); |
| 467 | demand_empty_rest_of_line (); |
| 468 | } |
| 469 | |
| 470 | static void |
| 471 | obj_elf_visibility (int visibility) |
| 472 | { |
| 473 | int c; |
| 474 | symbolS *symbolP; |
| 475 | asymbol *bfdsym; |
| 476 | elf_symbol_type *elfsym; |
| 477 | |
| 478 | do |
| 479 | { |
| 480 | symbolP = get_sym_from_input_line_and_check (); |
| 481 | |
| 482 | bfdsym = symbol_get_bfdsym (symbolP); |
| 483 | elfsym = elf_symbol_from (bfd_asymbol_bfd (bfdsym), bfdsym); |
| 484 | |
| 485 | gas_assert (elfsym); |
| 486 | |
| 487 | elfsym->internal_elf_sym.st_other &= ~3; |
| 488 | elfsym->internal_elf_sym.st_other |= visibility; |
| 489 | |
| 490 | c = *input_line_pointer; |
| 491 | if (c == ',') |
| 492 | { |
| 493 | input_line_pointer ++; |
| 494 | |
| 495 | SKIP_WHITESPACE (); |
| 496 | |
| 497 | if (*input_line_pointer == '\n') |
| 498 | c = '\n'; |
| 499 | } |
| 500 | } |
| 501 | while (c == ','); |
| 502 | |
| 503 | demand_empty_rest_of_line (); |
| 504 | } |
| 505 | |
| 506 | static segT previous_section; |
| 507 | static int previous_subsection; |
| 508 | |
| 509 | struct section_stack |
| 510 | { |
| 511 | struct section_stack *next; |
| 512 | segT seg, prev_seg; |
| 513 | int subseg, prev_subseg; |
| 514 | }; |
| 515 | |
| 516 | static struct section_stack *section_stack; |
| 517 | |
| 518 | static bfd_boolean |
| 519 | get_section (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf) |
| 520 | { |
| 521 | const char *gname = (const char *) inf; |
| 522 | const char *group_name = elf_group_name (sec); |
| 523 | |
| 524 | return (group_name == gname |
| 525 | || (group_name != NULL |
| 526 | && gname != NULL |
| 527 | && strcmp (group_name, gname) == 0)); |
| 528 | } |
| 529 | |
| 530 | /* Handle the .section pseudo-op. This code supports two different |
| 531 | syntaxes. |
| 532 | |
| 533 | The first is found on Solaris, and looks like |
| 534 | .section ".sec1",#alloc,#execinstr,#write |
| 535 | Here the names after '#' are the SHF_* flags to turn on for the |
| 536 | section. I'm not sure how it determines the SHT_* type (BFD |
| 537 | doesn't really give us control over the type, anyhow). |
| 538 | |
| 539 | The second format is found on UnixWare, and probably most SVR4 |
| 540 | machines, and looks like |
| 541 | .section .sec1,"a",@progbits |
| 542 | The quoted string may contain any combination of a, w, x, and |
| 543 | represents the SHF_* flags to turn on for the section. The string |
| 544 | beginning with '@' can be progbits or nobits. There should be |
| 545 | other possibilities, but I don't know what they are. In any case, |
| 546 | BFD doesn't really let us set the section type. */ |
| 547 | |
| 548 | void |
| 549 | obj_elf_change_section (const char *name, |
| 550 | unsigned int type, |
| 551 | bfd_vma attr, |
| 552 | int entsize, |
| 553 | const char *group_name, |
| 554 | int linkonce, |
| 555 | int push) |
| 556 | { |
| 557 | asection *old_sec; |
| 558 | segT sec; |
| 559 | flagword flags; |
| 560 | const struct elf_backend_data *bed; |
| 561 | const struct bfd_elf_special_section *ssect; |
| 562 | |
| 563 | #ifdef md_flush_pending_output |
| 564 | md_flush_pending_output (); |
| 565 | #endif |
| 566 | |
| 567 | /* Switch to the section, creating it if necessary. */ |
| 568 | if (push) |
| 569 | { |
| 570 | struct section_stack *elt; |
| 571 | elt = XNEW (struct section_stack); |
| 572 | elt->next = section_stack; |
| 573 | elt->seg = now_seg; |
| 574 | elt->prev_seg = previous_section; |
| 575 | elt->subseg = now_subseg; |
| 576 | elt->prev_subseg = previous_subsection; |
| 577 | section_stack = elt; |
| 578 | } |
| 579 | previous_section = now_seg; |
| 580 | previous_subsection = now_subseg; |
| 581 | |
| 582 | old_sec = bfd_get_section_by_name_if (stdoutput, name, get_section, |
| 583 | (void *) group_name); |
| 584 | if (old_sec) |
| 585 | { |
| 586 | sec = old_sec; |
| 587 | subseg_set (sec, 0); |
| 588 | } |
| 589 | else |
| 590 | sec = subseg_force_new (name, 0); |
| 591 | |
| 592 | bed = get_elf_backend_data (stdoutput); |
| 593 | ssect = (*bed->get_sec_type_attr) (stdoutput, sec); |
| 594 | |
| 595 | if (ssect != NULL) |
| 596 | { |
| 597 | bfd_boolean override = FALSE; |
| 598 | |
| 599 | if (type == SHT_NULL) |
| 600 | type = ssect->type; |
| 601 | else if (type != ssect->type) |
| 602 | { |
| 603 | if (old_sec == NULL |
| 604 | /* Some older versions of gcc will emit |
| 605 | |
| 606 | .section .init_array,"aw",@progbits |
| 607 | |
| 608 | for __attribute__ ((section (".init_array"))). |
| 609 | "@progbits" is incorrect. Also for x86-64 large bss |
| 610 | sections, some older versions of gcc will emit |
| 611 | |
| 612 | .section .lbss,"aw",@progbits |
| 613 | |
| 614 | "@progbits" is incorrect. */ |
| 615 | #ifdef TC_I386 |
| 616 | && (bed->s->arch_size != 64 |
| 617 | || !(ssect->attr & SHF_X86_64_LARGE)) |
| 618 | #endif |
| 619 | && ssect->type != SHT_INIT_ARRAY |
| 620 | && ssect->type != SHT_FINI_ARRAY |
| 621 | && ssect->type != SHT_PREINIT_ARRAY) |
| 622 | { |
| 623 | /* We allow to specify any type for a .note section. */ |
| 624 | if (ssect->type != SHT_NOTE |
| 625 | /* Processor and application defined types are allowed too. */ |
| 626 | && type < SHT_LOPROC) |
| 627 | as_warn (_("setting incorrect section type for %s"), |
| 628 | name); |
| 629 | } |
| 630 | else |
| 631 | { |
| 632 | as_warn (_("ignoring incorrect section type for %s"), |
| 633 | name); |
| 634 | type = ssect->type; |
| 635 | } |
| 636 | } |
| 637 | |
| 638 | if (old_sec == NULL && ((attr & ~(SHF_MASKOS | SHF_MASKPROC)) |
| 639 | & ~ssect->attr) != 0) |
| 640 | { |
| 641 | /* As a GNU extension, we permit a .note section to be |
| 642 | allocatable. If the linker sees an allocatable .note |
| 643 | section, it will create a PT_NOTE segment in the output |
| 644 | file. We also allow "x" for .note.GNU-stack. */ |
| 645 | if (ssect->type == SHT_NOTE |
| 646 | && (attr == SHF_ALLOC || attr == SHF_EXECINSTR)) |
| 647 | ; |
| 648 | /* Allow different SHF_MERGE and SHF_STRINGS if we have |
| 649 | something like .rodata.str. */ |
| 650 | else if (ssect->suffix_length == -2 |
| 651 | && name[ssect->prefix_length] == '.' |
| 652 | && (attr |
| 653 | & ~ssect->attr |
| 654 | & ~SHF_MERGE |
| 655 | & ~SHF_STRINGS) == 0) |
| 656 | ; |
| 657 | /* .interp, .strtab and .symtab can have SHF_ALLOC. */ |
| 658 | else if (attr == SHF_ALLOC |
| 659 | && (strcmp (name, ".interp") == 0 |
| 660 | || strcmp (name, ".strtab") == 0 |
| 661 | || strcmp (name, ".symtab") == 0)) |
| 662 | override = TRUE; |
| 663 | /* .note.GNU-stack can have SHF_EXECINSTR. */ |
| 664 | else if (attr == SHF_EXECINSTR |
| 665 | && strcmp (name, ".note.GNU-stack") == 0) |
| 666 | override = TRUE; |
| 667 | #ifdef TC_ALPHA |
| 668 | /* A section on Alpha may have SHF_ALPHA_GPREL. */ |
| 669 | else if ((attr & ~ssect->attr) == SHF_ALPHA_GPREL) |
| 670 | override = TRUE; |
| 671 | #endif |
| 672 | #ifdef TC_RX |
| 673 | else if (attr == (SHF_EXECINSTR | SHF_WRITE | SHF_ALLOC) |
| 674 | && (ssect->type == SHT_INIT_ARRAY |
| 675 | || ssect->type == SHT_FINI_ARRAY |
| 676 | || ssect->type == SHT_PREINIT_ARRAY)) |
| 677 | /* RX init/fini arrays can and should have the "awx" attributes set. */ |
| 678 | ; |
| 679 | #endif |
| 680 | else |
| 681 | { |
| 682 | if (group_name == NULL) |
| 683 | as_warn (_("setting incorrect section attributes for %s"), |
| 684 | name); |
| 685 | override = TRUE; |
| 686 | } |
| 687 | } |
| 688 | |
| 689 | if (!override && old_sec == NULL) |
| 690 | attr |= ssect->attr; |
| 691 | } |
| 692 | |
| 693 | /* Convert ELF type and flags to BFD flags. */ |
| 694 | flags = (SEC_RELOC |
| 695 | | ((attr & SHF_WRITE) ? 0 : SEC_READONLY) |
| 696 | | ((attr & SHF_ALLOC) ? SEC_ALLOC : 0) |
| 697 | | (((attr & SHF_ALLOC) && type != SHT_NOBITS) ? SEC_LOAD : 0) |
| 698 | | ((attr & SHF_EXECINSTR) ? SEC_CODE : 0) |
| 699 | | ((attr & SHF_MERGE) ? SEC_MERGE : 0) |
| 700 | | ((attr & SHF_STRINGS) ? SEC_STRINGS : 0) |
| 701 | | ((attr & SHF_EXCLUDE) ? SEC_EXCLUDE: 0) |
| 702 | | ((attr & SHF_TLS) ? SEC_THREAD_LOCAL : 0)); |
| 703 | #ifdef md_elf_section_flags |
| 704 | flags = md_elf_section_flags (flags, attr, type); |
| 705 | #endif |
| 706 | |
| 707 | if (linkonce) |
| 708 | flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD; |
| 709 | |
| 710 | if (old_sec == NULL) |
| 711 | { |
| 712 | symbolS *secsym; |
| 713 | |
| 714 | if (type == SHT_NULL) |
| 715 | type = bfd_elf_get_default_section_type (flags); |
| 716 | elf_section_type (sec) = type; |
| 717 | elf_section_flags (sec) = attr; |
| 718 | |
| 719 | /* Prevent SEC_HAS_CONTENTS from being inadvertently set. */ |
| 720 | if (type == SHT_NOBITS) |
| 721 | seg_info (sec)->bss = 1; |
| 722 | |
| 723 | bfd_set_section_flags (stdoutput, sec, flags); |
| 724 | if (flags & SEC_MERGE) |
| 725 | sec->entsize = entsize; |
| 726 | elf_group_name (sec) = group_name; |
| 727 | |
| 728 | /* Add a symbol for this section to the symbol table. */ |
| 729 | secsym = symbol_find (name); |
| 730 | if (secsym != NULL) |
| 731 | symbol_set_bfdsym (secsym, sec->symbol); |
| 732 | else |
| 733 | symbol_table_insert (section_symbol (sec)); |
| 734 | } |
| 735 | else |
| 736 | { |
| 737 | if (type != SHT_NULL |
| 738 | && (unsigned) type != elf_section_type (old_sec)) |
| 739 | as_warn (_("ignoring changed section type for %s"), name); |
| 740 | |
| 741 | if (attr != 0) |
| 742 | { |
| 743 | /* If section attributes are specified the second time we see a |
| 744 | particular section, then check that they are the same as we |
| 745 | saw the first time. */ |
| 746 | if (((old_sec->flags ^ flags) |
| 747 | & (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE |
| 748 | | SEC_EXCLUDE | SEC_SORT_ENTRIES | SEC_MERGE | SEC_STRINGS |
| 749 | | SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD |
| 750 | | SEC_THREAD_LOCAL))) |
| 751 | as_warn (_("ignoring changed section attributes for %s"), name); |
| 752 | else |
| 753 | /* FIXME: Maybe we should consider removing a previously set |
| 754 | processor or application specific attribute as suspicious ? */ |
| 755 | elf_section_flags (sec) = attr; |
| 756 | |
| 757 | if ((flags & SEC_MERGE) && old_sec->entsize != (unsigned) entsize) |
| 758 | as_warn (_("ignoring changed section entity size for %s"), name); |
| 759 | } |
| 760 | } |
| 761 | |
| 762 | #ifdef md_elf_section_change_hook |
| 763 | md_elf_section_change_hook (); |
| 764 | #endif |
| 765 | } |
| 766 | |
| 767 | static bfd_vma |
| 768 | obj_elf_parse_section_letters (char *str, size_t len, bfd_boolean *is_clone) |
| 769 | { |
| 770 | bfd_vma attr = 0; |
| 771 | *is_clone = FALSE; |
| 772 | |
| 773 | while (len > 0) |
| 774 | { |
| 775 | switch (*str) |
| 776 | { |
| 777 | case 'a': |
| 778 | attr |= SHF_ALLOC; |
| 779 | break; |
| 780 | case 'e': |
| 781 | attr |= SHF_EXCLUDE; |
| 782 | break; |
| 783 | case 'w': |
| 784 | attr |= SHF_WRITE; |
| 785 | break; |
| 786 | case 'x': |
| 787 | attr |= SHF_EXECINSTR; |
| 788 | break; |
| 789 | case 'M': |
| 790 | attr |= SHF_MERGE; |
| 791 | break; |
| 792 | case 'S': |
| 793 | attr |= SHF_STRINGS; |
| 794 | break; |
| 795 | case 'G': |
| 796 | attr |= SHF_GROUP; |
| 797 | break; |
| 798 | case 'T': |
| 799 | attr |= SHF_TLS; |
| 800 | break; |
| 801 | case '?': |
| 802 | *is_clone = TRUE; |
| 803 | break; |
| 804 | /* Compatibility. */ |
| 805 | case 'm': |
| 806 | if (*(str - 1) == 'a') |
| 807 | { |
| 808 | attr |= SHF_MERGE; |
| 809 | if (len > 1 && str[1] == 's') |
| 810 | { |
| 811 | attr |= SHF_STRINGS; |
| 812 | str++, len--; |
| 813 | } |
| 814 | break; |
| 815 | } |
| 816 | default: |
| 817 | { |
| 818 | const char *bad_msg = _("unrecognized .section attribute:" |
| 819 | " want a,e,w,x,M,S,G,T or number"); |
| 820 | #ifdef md_elf_section_letter |
| 821 | bfd_vma md_attr = md_elf_section_letter (*str, &bad_msg); |
| 822 | if (md_attr != (bfd_vma) -1) |
| 823 | attr |= md_attr; |
| 824 | else |
| 825 | #endif |
| 826 | if (ISDIGIT (*str)) |
| 827 | { |
| 828 | char * end; |
| 829 | |
| 830 | attr |= strtoul (str, & end, 0); |
| 831 | /* Update str and len, allowing for the fact that |
| 832 | we will execute str++ and len-- below. */ |
| 833 | end --; |
| 834 | len -= (end - str); |
| 835 | str = end; |
| 836 | } |
| 837 | else |
| 838 | as_fatal ("%s", bad_msg); |
| 839 | } |
| 840 | break; |
| 841 | } |
| 842 | str++, len--; |
| 843 | } |
| 844 | |
| 845 | return attr; |
| 846 | } |
| 847 | |
| 848 | static int |
| 849 | obj_elf_section_type (char *str, size_t len, bfd_boolean warn) |
| 850 | { |
| 851 | if (len == 8 && strncmp (str, "progbits", 8) == 0) |
| 852 | return SHT_PROGBITS; |
| 853 | if (len == 6 && strncmp (str, "nobits", 6) == 0) |
| 854 | return SHT_NOBITS; |
| 855 | if (len == 4 && strncmp (str, "note", 4) == 0) |
| 856 | return SHT_NOTE; |
| 857 | if (len == 10 && strncmp (str, "init_array", 10) == 0) |
| 858 | return SHT_INIT_ARRAY; |
| 859 | if (len == 10 && strncmp (str, "fini_array", 10) == 0) |
| 860 | return SHT_FINI_ARRAY; |
| 861 | if (len == 13 && strncmp (str, "preinit_array", 13) == 0) |
| 862 | return SHT_PREINIT_ARRAY; |
| 863 | |
| 864 | #ifdef md_elf_section_type |
| 865 | { |
| 866 | int md_type = md_elf_section_type (str, len); |
| 867 | if (md_type >= 0) |
| 868 | return md_type; |
| 869 | } |
| 870 | #endif |
| 871 | |
| 872 | if (ISDIGIT (*str)) |
| 873 | { |
| 874 | char * end; |
| 875 | int type = strtoul (str, & end, 0); |
| 876 | |
| 877 | if (warn && (size_t) (end - str) != len) |
| 878 | as_warn (_("extraneous characters at end of numeric section type")); |
| 879 | |
| 880 | return type; |
| 881 | } |
| 882 | |
| 883 | if (warn) |
| 884 | as_warn (_("unrecognized section type")); |
| 885 | return 0; |
| 886 | } |
| 887 | |
| 888 | static bfd_vma |
| 889 | obj_elf_section_word (char *str, size_t len, int *type) |
| 890 | { |
| 891 | int ret; |
| 892 | |
| 893 | if (len == 5 && strncmp (str, "write", 5) == 0) |
| 894 | return SHF_WRITE; |
| 895 | if (len == 5 && strncmp (str, "alloc", 5) == 0) |
| 896 | return SHF_ALLOC; |
| 897 | if (len == 9 && strncmp (str, "execinstr", 9) == 0) |
| 898 | return SHF_EXECINSTR; |
| 899 | if (len == 7 && strncmp (str, "exclude", 7) == 0) |
| 900 | return SHF_EXCLUDE; |
| 901 | if (len == 3 && strncmp (str, "tls", 3) == 0) |
| 902 | return SHF_TLS; |
| 903 | |
| 904 | #ifdef md_elf_section_word |
| 905 | { |
| 906 | bfd_vma md_attr = md_elf_section_word (str, len); |
| 907 | if (md_attr > 0) |
| 908 | return md_attr; |
| 909 | } |
| 910 | #endif |
| 911 | |
| 912 | ret = obj_elf_section_type (str, len, FALSE); |
| 913 | if (ret != 0) |
| 914 | *type = ret; |
| 915 | else |
| 916 | as_warn (_("unrecognized section attribute")); |
| 917 | |
| 918 | return 0; |
| 919 | } |
| 920 | |
| 921 | /* Get name of section. */ |
| 922 | const char * |
| 923 | obj_elf_section_name (void) |
| 924 | { |
| 925 | char *name; |
| 926 | |
| 927 | SKIP_WHITESPACE (); |
| 928 | if (*input_line_pointer == '"') |
| 929 | { |
| 930 | int dummy; |
| 931 | |
| 932 | name = demand_copy_C_string (&dummy); |
| 933 | if (name == NULL) |
| 934 | { |
| 935 | ignore_rest_of_line (); |
| 936 | return NULL; |
| 937 | } |
| 938 | } |
| 939 | else |
| 940 | { |
| 941 | char *end = input_line_pointer; |
| 942 | |
| 943 | while (0 == strchr ("\n\t,; ", *end)) |
| 944 | end++; |
| 945 | if (end == input_line_pointer) |
| 946 | { |
| 947 | as_bad (_("missing name")); |
| 948 | ignore_rest_of_line (); |
| 949 | return NULL; |
| 950 | } |
| 951 | |
| 952 | name = xmemdup0 (input_line_pointer, end - input_line_pointer); |
| 953 | |
| 954 | while (flag_sectname_subst) |
| 955 | { |
| 956 | char *subst = strchr (name, '%'); |
| 957 | if (subst && subst[1] == 'S') |
| 958 | { |
| 959 | int oldlen = strlen (name); |
| 960 | int substlen = strlen (now_seg->name); |
| 961 | int newlen = oldlen - 2 + substlen; |
| 962 | char *newname = (char *) xmalloc (newlen + 1); |
| 963 | int headlen = subst - name; |
| 964 | memcpy (newname, name, headlen); |
| 965 | strcpy (newname + headlen, now_seg->name); |
| 966 | strcat (newname + headlen, subst + 2); |
| 967 | xfree (name); |
| 968 | name = newname; |
| 969 | } |
| 970 | else |
| 971 | break; |
| 972 | } |
| 973 | |
| 974 | #ifdef tc_canonicalize_section_name |
| 975 | name = tc_canonicalize_section_name (name); |
| 976 | #endif |
| 977 | input_line_pointer = end; |
| 978 | } |
| 979 | SKIP_WHITESPACE (); |
| 980 | return name; |
| 981 | } |
| 982 | |
| 983 | void |
| 984 | obj_elf_section (int push) |
| 985 | { |
| 986 | const char *name, *group_name; |
| 987 | char *beg; |
| 988 | int type, dummy; |
| 989 | bfd_vma attr; |
| 990 | int entsize; |
| 991 | int linkonce; |
| 992 | subsegT new_subsection = -1; |
| 993 | |
| 994 | #ifndef TC_I370 |
| 995 | if (flag_mri) |
| 996 | { |
| 997 | char mri_type; |
| 998 | |
| 999 | #ifdef md_flush_pending_output |
| 1000 | md_flush_pending_output (); |
| 1001 | #endif |
| 1002 | |
| 1003 | previous_section = now_seg; |
| 1004 | previous_subsection = now_subseg; |
| 1005 | |
| 1006 | s_mri_sect (&mri_type); |
| 1007 | |
| 1008 | #ifdef md_elf_section_change_hook |
| 1009 | md_elf_section_change_hook (); |
| 1010 | #endif |
| 1011 | |
| 1012 | return; |
| 1013 | } |
| 1014 | #endif /* ! defined (TC_I370) */ |
| 1015 | |
| 1016 | name = obj_elf_section_name (); |
| 1017 | if (name == NULL) |
| 1018 | return; |
| 1019 | type = SHT_NULL; |
| 1020 | attr = 0; |
| 1021 | group_name = NULL; |
| 1022 | entsize = 0; |
| 1023 | linkonce = 0; |
| 1024 | |
| 1025 | if (*input_line_pointer == ',') |
| 1026 | { |
| 1027 | /* Skip the comma. */ |
| 1028 | ++input_line_pointer; |
| 1029 | SKIP_WHITESPACE (); |
| 1030 | |
| 1031 | if (push && ISDIGIT (*input_line_pointer)) |
| 1032 | { |
| 1033 | /* .pushsection has an optional subsection. */ |
| 1034 | new_subsection = (subsegT) get_absolute_expression (); |
| 1035 | |
| 1036 | SKIP_WHITESPACE (); |
| 1037 | |
| 1038 | /* Stop if we don't see a comma. */ |
| 1039 | if (*input_line_pointer != ',') |
| 1040 | goto done; |
| 1041 | |
| 1042 | /* Skip the comma. */ |
| 1043 | ++input_line_pointer; |
| 1044 | SKIP_WHITESPACE (); |
| 1045 | } |
| 1046 | |
| 1047 | if (*input_line_pointer == '"') |
| 1048 | { |
| 1049 | bfd_boolean is_clone; |
| 1050 | |
| 1051 | beg = demand_copy_C_string (&dummy); |
| 1052 | if (beg == NULL) |
| 1053 | { |
| 1054 | ignore_rest_of_line (); |
| 1055 | return; |
| 1056 | } |
| 1057 | attr |= obj_elf_parse_section_letters (beg, strlen (beg), &is_clone); |
| 1058 | |
| 1059 | SKIP_WHITESPACE (); |
| 1060 | if (*input_line_pointer == ',') |
| 1061 | { |
| 1062 | char c; |
| 1063 | char *save = input_line_pointer; |
| 1064 | |
| 1065 | ++input_line_pointer; |
| 1066 | SKIP_WHITESPACE (); |
| 1067 | c = *input_line_pointer; |
| 1068 | if (c == '"') |
| 1069 | { |
| 1070 | beg = demand_copy_C_string (&dummy); |
| 1071 | if (beg == NULL) |
| 1072 | { |
| 1073 | ignore_rest_of_line (); |
| 1074 | return; |
| 1075 | } |
| 1076 | type = obj_elf_section_type (beg, strlen (beg), TRUE); |
| 1077 | } |
| 1078 | else if (c == '@' || c == '%') |
| 1079 | { |
| 1080 | ++input_line_pointer; |
| 1081 | |
| 1082 | if (ISDIGIT (* input_line_pointer)) |
| 1083 | { |
| 1084 | type = strtoul (input_line_pointer, & input_line_pointer, 0); |
| 1085 | } |
| 1086 | else |
| 1087 | { |
| 1088 | c = get_symbol_name (& beg); |
| 1089 | (void) restore_line_pointer (c); |
| 1090 | type = obj_elf_section_type (beg, input_line_pointer - beg, TRUE); |
| 1091 | } |
| 1092 | } |
| 1093 | else |
| 1094 | input_line_pointer = save; |
| 1095 | } |
| 1096 | |
| 1097 | SKIP_WHITESPACE (); |
| 1098 | if ((attr & SHF_MERGE) != 0 && *input_line_pointer == ',') |
| 1099 | { |
| 1100 | ++input_line_pointer; |
| 1101 | SKIP_WHITESPACE (); |
| 1102 | entsize = get_absolute_expression (); |
| 1103 | SKIP_WHITESPACE (); |
| 1104 | if (entsize < 0) |
| 1105 | { |
| 1106 | as_warn (_("invalid merge entity size")); |
| 1107 | attr &= ~SHF_MERGE; |
| 1108 | entsize = 0; |
| 1109 | } |
| 1110 | } |
| 1111 | else if ((attr & SHF_MERGE) != 0) |
| 1112 | { |
| 1113 | as_warn (_("entity size for SHF_MERGE not specified")); |
| 1114 | attr &= ~SHF_MERGE; |
| 1115 | } |
| 1116 | |
| 1117 | if ((attr & SHF_GROUP) != 0 && is_clone) |
| 1118 | { |
| 1119 | as_warn (_("? section flag ignored with G present")); |
| 1120 | is_clone = FALSE; |
| 1121 | } |
| 1122 | if ((attr & SHF_GROUP) != 0 && *input_line_pointer == ',') |
| 1123 | { |
| 1124 | ++input_line_pointer; |
| 1125 | group_name = obj_elf_section_name (); |
| 1126 | if (group_name == NULL) |
| 1127 | attr &= ~SHF_GROUP; |
| 1128 | else if (*input_line_pointer == ',') |
| 1129 | { |
| 1130 | ++input_line_pointer; |
| 1131 | SKIP_WHITESPACE (); |
| 1132 | if (strncmp (input_line_pointer, "comdat", 6) == 0) |
| 1133 | { |
| 1134 | input_line_pointer += 6; |
| 1135 | linkonce = 1; |
| 1136 | } |
| 1137 | } |
| 1138 | else if (strncmp (name, ".gnu.linkonce", 13) == 0) |
| 1139 | linkonce = 1; |
| 1140 | } |
| 1141 | else if ((attr & SHF_GROUP) != 0) |
| 1142 | { |
| 1143 | as_warn (_("group name for SHF_GROUP not specified")); |
| 1144 | attr &= ~SHF_GROUP; |
| 1145 | } |
| 1146 | |
| 1147 | if (is_clone) |
| 1148 | { |
| 1149 | const char *now_group = elf_group_name (now_seg); |
| 1150 | if (now_group != NULL) |
| 1151 | { |
| 1152 | group_name = xstrdup (now_group); |
| 1153 | linkonce = (now_seg->flags & SEC_LINK_ONCE) != 0; |
| 1154 | } |
| 1155 | } |
| 1156 | } |
| 1157 | else |
| 1158 | { |
| 1159 | do |
| 1160 | { |
| 1161 | char c; |
| 1162 | |
| 1163 | SKIP_WHITESPACE (); |
| 1164 | if (*input_line_pointer != '#') |
| 1165 | { |
| 1166 | as_bad (_("character following name is not '#'")); |
| 1167 | ignore_rest_of_line (); |
| 1168 | return; |
| 1169 | } |
| 1170 | ++input_line_pointer; |
| 1171 | c = get_symbol_name (& beg); |
| 1172 | (void) restore_line_pointer (c); |
| 1173 | |
| 1174 | attr |= obj_elf_section_word (beg, input_line_pointer - beg, & type); |
| 1175 | |
| 1176 | SKIP_WHITESPACE (); |
| 1177 | } |
| 1178 | while (*input_line_pointer++ == ','); |
| 1179 | --input_line_pointer; |
| 1180 | } |
| 1181 | } |
| 1182 | |
| 1183 | done: |
| 1184 | demand_empty_rest_of_line (); |
| 1185 | |
| 1186 | obj_elf_change_section (name, type, attr, entsize, group_name, linkonce, push); |
| 1187 | |
| 1188 | if (push && new_subsection != -1) |
| 1189 | subseg_set (now_seg, new_subsection); |
| 1190 | } |
| 1191 | |
| 1192 | /* Change to the .data section. */ |
| 1193 | |
| 1194 | void |
| 1195 | obj_elf_data (int i) |
| 1196 | { |
| 1197 | #ifdef md_flush_pending_output |
| 1198 | md_flush_pending_output (); |
| 1199 | #endif |
| 1200 | |
| 1201 | previous_section = now_seg; |
| 1202 | previous_subsection = now_subseg; |
| 1203 | s_data (i); |
| 1204 | |
| 1205 | #ifdef md_elf_section_change_hook |
| 1206 | md_elf_section_change_hook (); |
| 1207 | #endif |
| 1208 | } |
| 1209 | |
| 1210 | /* Change to the .text section. */ |
| 1211 | |
| 1212 | void |
| 1213 | obj_elf_text (int i) |
| 1214 | { |
| 1215 | #ifdef md_flush_pending_output |
| 1216 | md_flush_pending_output (); |
| 1217 | #endif |
| 1218 | |
| 1219 | previous_section = now_seg; |
| 1220 | previous_subsection = now_subseg; |
| 1221 | s_text (i); |
| 1222 | |
| 1223 | #ifdef md_elf_section_change_hook |
| 1224 | md_elf_section_change_hook (); |
| 1225 | #endif |
| 1226 | } |
| 1227 | |
| 1228 | /* Change to the *ABS* section. */ |
| 1229 | |
| 1230 | void |
| 1231 | obj_elf_struct (int i) |
| 1232 | { |
| 1233 | #ifdef md_flush_pending_output |
| 1234 | md_flush_pending_output (); |
| 1235 | #endif |
| 1236 | |
| 1237 | previous_section = now_seg; |
| 1238 | previous_subsection = now_subseg; |
| 1239 | s_struct (i); |
| 1240 | |
| 1241 | #ifdef md_elf_section_change_hook |
| 1242 | md_elf_section_change_hook (); |
| 1243 | #endif |
| 1244 | } |
| 1245 | |
| 1246 | static void |
| 1247 | obj_elf_subsection (int ignore ATTRIBUTE_UNUSED) |
| 1248 | { |
| 1249 | int temp; |
| 1250 | |
| 1251 | #ifdef md_flush_pending_output |
| 1252 | md_flush_pending_output (); |
| 1253 | #endif |
| 1254 | |
| 1255 | previous_section = now_seg; |
| 1256 | previous_subsection = now_subseg; |
| 1257 | |
| 1258 | temp = get_absolute_expression (); |
| 1259 | subseg_set (now_seg, (subsegT) temp); |
| 1260 | demand_empty_rest_of_line (); |
| 1261 | |
| 1262 | #ifdef md_elf_section_change_hook |
| 1263 | md_elf_section_change_hook (); |
| 1264 | #endif |
| 1265 | } |
| 1266 | |
| 1267 | /* This can be called from the processor backends if they change |
| 1268 | sections. */ |
| 1269 | |
| 1270 | void |
| 1271 | obj_elf_section_change_hook (void) |
| 1272 | { |
| 1273 | previous_section = now_seg; |
| 1274 | previous_subsection = now_subseg; |
| 1275 | } |
| 1276 | |
| 1277 | void |
| 1278 | obj_elf_previous (int ignore ATTRIBUTE_UNUSED) |
| 1279 | { |
| 1280 | segT new_section; |
| 1281 | int new_subsection; |
| 1282 | |
| 1283 | if (previous_section == 0) |
| 1284 | { |
| 1285 | as_warn (_(".previous without corresponding .section; ignored")); |
| 1286 | return; |
| 1287 | } |
| 1288 | |
| 1289 | #ifdef md_flush_pending_output |
| 1290 | md_flush_pending_output (); |
| 1291 | #endif |
| 1292 | |
| 1293 | new_section = previous_section; |
| 1294 | new_subsection = previous_subsection; |
| 1295 | previous_section = now_seg; |
| 1296 | previous_subsection = now_subseg; |
| 1297 | subseg_set (new_section, new_subsection); |
| 1298 | |
| 1299 | #ifdef md_elf_section_change_hook |
| 1300 | md_elf_section_change_hook (); |
| 1301 | #endif |
| 1302 | } |
| 1303 | |
| 1304 | static void |
| 1305 | obj_elf_popsection (int xxx ATTRIBUTE_UNUSED) |
| 1306 | { |
| 1307 | struct section_stack *top = section_stack; |
| 1308 | |
| 1309 | if (top == NULL) |
| 1310 | { |
| 1311 | as_warn (_(".popsection without corresponding .pushsection; ignored")); |
| 1312 | return; |
| 1313 | } |
| 1314 | |
| 1315 | #ifdef md_flush_pending_output |
| 1316 | md_flush_pending_output (); |
| 1317 | #endif |
| 1318 | |
| 1319 | section_stack = top->next; |
| 1320 | previous_section = top->prev_seg; |
| 1321 | previous_subsection = top->prev_subseg; |
| 1322 | subseg_set (top->seg, top->subseg); |
| 1323 | free (top); |
| 1324 | |
| 1325 | #ifdef md_elf_section_change_hook |
| 1326 | md_elf_section_change_hook (); |
| 1327 | #endif |
| 1328 | } |
| 1329 | |
| 1330 | static void |
| 1331 | obj_elf_line (int ignore ATTRIBUTE_UNUSED) |
| 1332 | { |
| 1333 | /* Assume delimiter is part of expression. BSD4.2 as fails with |
| 1334 | delightful bug, so we are not being incompatible here. */ |
| 1335 | new_logical_line (NULL, get_absolute_expression ()); |
| 1336 | demand_empty_rest_of_line (); |
| 1337 | } |
| 1338 | |
| 1339 | /* This handles the .symver pseudo-op, which is used to specify a |
| 1340 | symbol version. The syntax is ``.symver NAME,SYMVERNAME''. |
| 1341 | SYMVERNAME may contain ELF_VER_CHR ('@') characters. This |
| 1342 | pseudo-op causes the assembler to emit a symbol named SYMVERNAME |
| 1343 | with the same value as the symbol NAME. */ |
| 1344 | |
| 1345 | static void |
| 1346 | obj_elf_symver (int ignore ATTRIBUTE_UNUSED) |
| 1347 | { |
| 1348 | char *name; |
| 1349 | char c; |
| 1350 | char old_lexat; |
| 1351 | symbolS *sym; |
| 1352 | |
| 1353 | sym = get_sym_from_input_line_and_check (); |
| 1354 | |
| 1355 | if (*input_line_pointer != ',') |
| 1356 | { |
| 1357 | as_bad (_("expected comma after name in .symver")); |
| 1358 | ignore_rest_of_line (); |
| 1359 | return; |
| 1360 | } |
| 1361 | |
| 1362 | ++input_line_pointer; |
| 1363 | SKIP_WHITESPACE (); |
| 1364 | |
| 1365 | /* Temporarily include '@' in symbol names. */ |
| 1366 | old_lexat = lex_type[(unsigned char) '@']; |
| 1367 | lex_type[(unsigned char) '@'] |= LEX_NAME; |
| 1368 | c = get_symbol_name (& name); |
| 1369 | lex_type[(unsigned char) '@'] = old_lexat; |
| 1370 | |
| 1371 | if (symbol_get_obj (sym)->versioned_name == NULL) |
| 1372 | { |
| 1373 | symbol_get_obj (sym)->versioned_name = xstrdup (name); |
| 1374 | |
| 1375 | (void) restore_line_pointer (c); |
| 1376 | |
| 1377 | if (strchr (symbol_get_obj (sym)->versioned_name, |
| 1378 | ELF_VER_CHR) == NULL) |
| 1379 | { |
| 1380 | as_bad (_("missing version name in `%s' for symbol `%s'"), |
| 1381 | symbol_get_obj (sym)->versioned_name, |
| 1382 | S_GET_NAME (sym)); |
| 1383 | ignore_rest_of_line (); |
| 1384 | return; |
| 1385 | } |
| 1386 | } |
| 1387 | else |
| 1388 | { |
| 1389 | if (strcmp (symbol_get_obj (sym)->versioned_name, name)) |
| 1390 | { |
| 1391 | as_bad (_("multiple versions [`%s'|`%s'] for symbol `%s'"), |
| 1392 | name, symbol_get_obj (sym)->versioned_name, |
| 1393 | S_GET_NAME (sym)); |
| 1394 | ignore_rest_of_line (); |
| 1395 | return; |
| 1396 | } |
| 1397 | |
| 1398 | (void) restore_line_pointer (c); |
| 1399 | } |
| 1400 | |
| 1401 | demand_empty_rest_of_line (); |
| 1402 | } |
| 1403 | |
| 1404 | /* This handles the .vtable_inherit pseudo-op, which is used to indicate |
| 1405 | to the linker the hierarchy in which a particular table resides. The |
| 1406 | syntax is ".vtable_inherit CHILDNAME, PARENTNAME". */ |
| 1407 | |
| 1408 | struct fix * |
| 1409 | obj_elf_vtable_inherit (int ignore ATTRIBUTE_UNUSED) |
| 1410 | { |
| 1411 | char *cname, *pname; |
| 1412 | symbolS *csym, *psym; |
| 1413 | char c, bad = 0; |
| 1414 | |
| 1415 | if (*input_line_pointer == '#') |
| 1416 | ++input_line_pointer; |
| 1417 | |
| 1418 | c = get_symbol_name (& cname); |
| 1419 | csym = symbol_find (cname); |
| 1420 | |
| 1421 | /* GCFIXME: should check that we don't have two .vtable_inherits for |
| 1422 | the same child symbol. Also, we can currently only do this if the |
| 1423 | child symbol is already exists and is placed in a fragment. */ |
| 1424 | |
| 1425 | if (csym == NULL || symbol_get_frag (csym) == NULL) |
| 1426 | { |
| 1427 | as_bad (_("expected `%s' to have already been set for .vtable_inherit"), |
| 1428 | cname); |
| 1429 | bad = 1; |
| 1430 | } |
| 1431 | |
| 1432 | *input_line_pointer = c; |
| 1433 | |
| 1434 | SKIP_WHITESPACE_AFTER_NAME (); |
| 1435 | if (*input_line_pointer != ',') |
| 1436 | { |
| 1437 | as_bad (_("expected comma after name in .vtable_inherit")); |
| 1438 | ignore_rest_of_line (); |
| 1439 | return NULL; |
| 1440 | } |
| 1441 | |
| 1442 | ++input_line_pointer; |
| 1443 | SKIP_WHITESPACE (); |
| 1444 | |
| 1445 | if (*input_line_pointer == '#') |
| 1446 | ++input_line_pointer; |
| 1447 | |
| 1448 | if (input_line_pointer[0] == '0' |
| 1449 | && (input_line_pointer[1] == '\0' |
| 1450 | || ISSPACE (input_line_pointer[1]))) |
| 1451 | { |
| 1452 | psym = section_symbol (absolute_section); |
| 1453 | ++input_line_pointer; |
| 1454 | } |
| 1455 | else |
| 1456 | { |
| 1457 | c = get_symbol_name (& pname); |
| 1458 | psym = symbol_find_or_make (pname); |
| 1459 | restore_line_pointer (c); |
| 1460 | } |
| 1461 | |
| 1462 | demand_empty_rest_of_line (); |
| 1463 | |
| 1464 | if (bad) |
| 1465 | return NULL; |
| 1466 | |
| 1467 | gas_assert (symbol_get_value_expression (csym)->X_op == O_constant); |
| 1468 | return fix_new (symbol_get_frag (csym), |
| 1469 | symbol_get_value_expression (csym)->X_add_number, |
| 1470 | 0, psym, 0, 0, BFD_RELOC_VTABLE_INHERIT); |
| 1471 | } |
| 1472 | |
| 1473 | /* This handles the .vtable_entry pseudo-op, which is used to indicate |
| 1474 | to the linker that a vtable slot was used. The syntax is |
| 1475 | ".vtable_entry tablename, offset". */ |
| 1476 | |
| 1477 | struct fix * |
| 1478 | obj_elf_vtable_entry (int ignore ATTRIBUTE_UNUSED) |
| 1479 | { |
| 1480 | symbolS *sym; |
| 1481 | offsetT offset; |
| 1482 | |
| 1483 | if (*input_line_pointer == '#') |
| 1484 | ++input_line_pointer; |
| 1485 | |
| 1486 | sym = get_sym_from_input_line_and_check (); |
| 1487 | if (*input_line_pointer != ',') |
| 1488 | { |
| 1489 | as_bad (_("expected comma after name in .vtable_entry")); |
| 1490 | ignore_rest_of_line (); |
| 1491 | return NULL; |
| 1492 | } |
| 1493 | |
| 1494 | ++input_line_pointer; |
| 1495 | if (*input_line_pointer == '#') |
| 1496 | ++input_line_pointer; |
| 1497 | |
| 1498 | offset = get_absolute_expression (); |
| 1499 | |
| 1500 | demand_empty_rest_of_line (); |
| 1501 | |
| 1502 | return fix_new (frag_now, frag_now_fix (), 0, sym, offset, 0, |
| 1503 | BFD_RELOC_VTABLE_ENTRY); |
| 1504 | } |
| 1505 | |
| 1506 | #define skip_whitespace(str) do { if (*(str) == ' ') ++(str); } while (0) |
| 1507 | |
| 1508 | static inline int |
| 1509 | skip_past_char (char ** str, char c) |
| 1510 | { |
| 1511 | if (**str == c) |
| 1512 | { |
| 1513 | (*str)++; |
| 1514 | return 0; |
| 1515 | } |
| 1516 | else |
| 1517 | return -1; |
| 1518 | } |
| 1519 | #define skip_past_comma(str) skip_past_char (str, ',') |
| 1520 | |
| 1521 | /* A list of attributes that have been explicitly set by the assembly code. |
| 1522 | VENDOR is the vendor id, BASE is the tag shifted right by the number |
| 1523 | of bits in MASK, and bit N of MASK is set if tag BASE+N has been set. */ |
| 1524 | struct recorded_attribute_info { |
| 1525 | struct recorded_attribute_info *next; |
| 1526 | int vendor; |
| 1527 | unsigned int base; |
| 1528 | unsigned long mask; |
| 1529 | }; |
| 1530 | static struct recorded_attribute_info *recorded_attributes; |
| 1531 | |
| 1532 | /* Record that we have seen an explicit specification of attribute TAG |
| 1533 | for vendor VENDOR. */ |
| 1534 | |
| 1535 | static void |
| 1536 | record_attribute (int vendor, unsigned int tag) |
| 1537 | { |
| 1538 | unsigned int base; |
| 1539 | unsigned long mask; |
| 1540 | struct recorded_attribute_info *rai; |
| 1541 | |
| 1542 | base = tag / (8 * sizeof (rai->mask)); |
| 1543 | mask = 1UL << (tag % (8 * sizeof (rai->mask))); |
| 1544 | for (rai = recorded_attributes; rai; rai = rai->next) |
| 1545 | if (rai->vendor == vendor && rai->base == base) |
| 1546 | { |
| 1547 | rai->mask |= mask; |
| 1548 | return; |
| 1549 | } |
| 1550 | |
| 1551 | rai = XNEW (struct recorded_attribute_info); |
| 1552 | rai->next = recorded_attributes; |
| 1553 | rai->vendor = vendor; |
| 1554 | rai->base = base; |
| 1555 | rai->mask = mask; |
| 1556 | recorded_attributes = rai; |
| 1557 | } |
| 1558 | |
| 1559 | /* Return true if we have seen an explicit specification of attribute TAG |
| 1560 | for vendor VENDOR. */ |
| 1561 | |
| 1562 | bfd_boolean |
| 1563 | obj_elf_seen_attribute (int vendor, unsigned int tag) |
| 1564 | { |
| 1565 | unsigned int base; |
| 1566 | unsigned long mask; |
| 1567 | struct recorded_attribute_info *rai; |
| 1568 | |
| 1569 | base = tag / (8 * sizeof (rai->mask)); |
| 1570 | mask = 1UL << (tag % (8 * sizeof (rai->mask))); |
| 1571 | for (rai = recorded_attributes; rai; rai = rai->next) |
| 1572 | if (rai->vendor == vendor && rai->base == base) |
| 1573 | return (rai->mask & mask) != 0; |
| 1574 | return FALSE; |
| 1575 | } |
| 1576 | |
| 1577 | /* Parse an attribute directive for VENDOR. |
| 1578 | Returns the attribute number read, or zero on error. */ |
| 1579 | |
| 1580 | int |
| 1581 | obj_elf_vendor_attribute (int vendor) |
| 1582 | { |
| 1583 | expressionS exp; |
| 1584 | int type; |
| 1585 | int tag; |
| 1586 | unsigned int i = 0; |
| 1587 | char *s = NULL; |
| 1588 | |
| 1589 | /* Read the first number or name. */ |
| 1590 | skip_whitespace (input_line_pointer); |
| 1591 | s = input_line_pointer; |
| 1592 | if (ISDIGIT (*input_line_pointer)) |
| 1593 | { |
| 1594 | expression (& exp); |
| 1595 | if (exp.X_op != O_constant) |
| 1596 | goto bad; |
| 1597 | tag = exp.X_add_number; |
| 1598 | } |
| 1599 | else |
| 1600 | { |
| 1601 | char *name; |
| 1602 | |
| 1603 | /* A name may contain '_', but no other punctuation. */ |
| 1604 | for (; ISALNUM (*input_line_pointer) || *input_line_pointer == '_'; |
| 1605 | ++input_line_pointer) |
| 1606 | i++; |
| 1607 | if (i == 0) |
| 1608 | goto bad; |
| 1609 | |
| 1610 | name = xstrndup (s, i); |
| 1611 | |
| 1612 | #ifndef CONVERT_SYMBOLIC_ATTRIBUTE |
| 1613 | #define CONVERT_SYMBOLIC_ATTRIBUTE(a) -1 |
| 1614 | #endif |
| 1615 | |
| 1616 | tag = CONVERT_SYMBOLIC_ATTRIBUTE (name); |
| 1617 | if (tag == -1) |
| 1618 | { |
| 1619 | as_bad (_("Attribute name not recognised: %s"), name); |
| 1620 | ignore_rest_of_line (); |
| 1621 | free (name); |
| 1622 | return 0; |
| 1623 | } |
| 1624 | free (name); |
| 1625 | } |
| 1626 | |
| 1627 | type = _bfd_elf_obj_attrs_arg_type (stdoutput, vendor, tag); |
| 1628 | |
| 1629 | if (skip_past_comma (&input_line_pointer) == -1) |
| 1630 | goto bad; |
| 1631 | if (type & 1) |
| 1632 | { |
| 1633 | expression (& exp); |
| 1634 | if (exp.X_op != O_constant) |
| 1635 | { |
| 1636 | as_bad (_("expected numeric constant")); |
| 1637 | ignore_rest_of_line (); |
| 1638 | return 0; |
| 1639 | } |
| 1640 | i = exp.X_add_number; |
| 1641 | } |
| 1642 | if ((type & 3) == 3 |
| 1643 | && skip_past_comma (&input_line_pointer) == -1) |
| 1644 | { |
| 1645 | as_bad (_("expected comma")); |
| 1646 | ignore_rest_of_line (); |
| 1647 | return 0; |
| 1648 | } |
| 1649 | if (type & 2) |
| 1650 | { |
| 1651 | int len; |
| 1652 | |
| 1653 | skip_whitespace (input_line_pointer); |
| 1654 | if (*input_line_pointer != '"') |
| 1655 | goto bad_string; |
| 1656 | s = demand_copy_C_string (&len); |
| 1657 | } |
| 1658 | |
| 1659 | record_attribute (vendor, tag); |
| 1660 | switch (type & 3) |
| 1661 | { |
| 1662 | case 3: |
| 1663 | bfd_elf_add_obj_attr_int_string (stdoutput, vendor, tag, i, s); |
| 1664 | break; |
| 1665 | case 2: |
| 1666 | bfd_elf_add_obj_attr_string (stdoutput, vendor, tag, s); |
| 1667 | break; |
| 1668 | case 1: |
| 1669 | bfd_elf_add_obj_attr_int (stdoutput, vendor, tag, i); |
| 1670 | break; |
| 1671 | default: |
| 1672 | abort (); |
| 1673 | } |
| 1674 | |
| 1675 | demand_empty_rest_of_line (); |
| 1676 | return tag; |
| 1677 | bad_string: |
| 1678 | as_bad (_("bad string constant")); |
| 1679 | ignore_rest_of_line (); |
| 1680 | return 0; |
| 1681 | bad: |
| 1682 | as_bad (_("expected <tag> , <value>")); |
| 1683 | ignore_rest_of_line (); |
| 1684 | return 0; |
| 1685 | } |
| 1686 | |
| 1687 | /* Parse a .gnu_attribute directive. */ |
| 1688 | |
| 1689 | static void |
| 1690 | obj_elf_gnu_attribute (int ignored ATTRIBUTE_UNUSED) |
| 1691 | { |
| 1692 | obj_elf_vendor_attribute (OBJ_ATTR_GNU); |
| 1693 | } |
| 1694 | |
| 1695 | void |
| 1696 | elf_obj_read_begin_hook (void) |
| 1697 | { |
| 1698 | #ifdef NEED_ECOFF_DEBUG |
| 1699 | if (ECOFF_DEBUGGING) |
| 1700 | ecoff_read_begin_hook (); |
| 1701 | #endif |
| 1702 | } |
| 1703 | |
| 1704 | void |
| 1705 | elf_obj_symbol_new_hook (symbolS *symbolP) |
| 1706 | { |
| 1707 | struct elf_obj_sy *sy_obj; |
| 1708 | |
| 1709 | sy_obj = symbol_get_obj (symbolP); |
| 1710 | sy_obj->size = NULL; |
| 1711 | sy_obj->versioned_name = NULL; |
| 1712 | |
| 1713 | #ifdef NEED_ECOFF_DEBUG |
| 1714 | if (ECOFF_DEBUGGING) |
| 1715 | ecoff_symbol_new_hook (symbolP); |
| 1716 | #endif |
| 1717 | } |
| 1718 | |
| 1719 | /* When setting one symbol equal to another, by default we probably |
| 1720 | want them to have the same "size", whatever it means in the current |
| 1721 | context. */ |
| 1722 | |
| 1723 | void |
| 1724 | elf_copy_symbol_attributes (symbolS *dest, symbolS *src) |
| 1725 | { |
| 1726 | struct elf_obj_sy *srcelf = symbol_get_obj (src); |
| 1727 | struct elf_obj_sy *destelf = symbol_get_obj (dest); |
| 1728 | if (srcelf->size) |
| 1729 | { |
| 1730 | if (destelf->size == NULL) |
| 1731 | destelf->size = XNEW (expressionS); |
| 1732 | *destelf->size = *srcelf->size; |
| 1733 | } |
| 1734 | else |
| 1735 | { |
| 1736 | if (destelf->size != NULL) |
| 1737 | free (destelf->size); |
| 1738 | destelf->size = NULL; |
| 1739 | } |
| 1740 | S_SET_SIZE (dest, S_GET_SIZE (src)); |
| 1741 | /* Don't copy visibility. */ |
| 1742 | S_SET_OTHER (dest, (ELF_ST_VISIBILITY (S_GET_OTHER (dest)) |
| 1743 | | (S_GET_OTHER (src) & ~ELF_ST_VISIBILITY (-1)))); |
| 1744 | } |
| 1745 | |
| 1746 | void |
| 1747 | obj_elf_version (int ignore ATTRIBUTE_UNUSED) |
| 1748 | { |
| 1749 | char *name; |
| 1750 | unsigned int c; |
| 1751 | char *p; |
| 1752 | asection *seg = now_seg; |
| 1753 | subsegT subseg = now_subseg; |
| 1754 | Elf_Internal_Note i_note; |
| 1755 | Elf_External_Note e_note; |
| 1756 | asection *note_secp = NULL; |
| 1757 | |
| 1758 | SKIP_WHITESPACE (); |
| 1759 | if (*input_line_pointer == '\"') |
| 1760 | { |
| 1761 | unsigned int len; |
| 1762 | |
| 1763 | ++input_line_pointer; /* -> 1st char of string. */ |
| 1764 | name = input_line_pointer; |
| 1765 | |
| 1766 | while (is_a_char (c = next_char_of_string ())) |
| 1767 | ; |
| 1768 | c = *input_line_pointer; |
| 1769 | *input_line_pointer = '\0'; |
| 1770 | *(input_line_pointer - 1) = '\0'; |
| 1771 | *input_line_pointer = c; |
| 1772 | |
| 1773 | /* Create the .note section. */ |
| 1774 | note_secp = subseg_new (".note", 0); |
| 1775 | bfd_set_section_flags (stdoutput, |
| 1776 | note_secp, |
| 1777 | SEC_HAS_CONTENTS | SEC_READONLY); |
| 1778 | |
| 1779 | /* Process the version string. */ |
| 1780 | len = strlen (name) + 1; |
| 1781 | |
| 1782 | /* PR 3456: Although the name field is padded out to an 4-byte |
| 1783 | boundary, the namesz field should not be adjusted. */ |
| 1784 | i_note.namesz = len; |
| 1785 | i_note.descsz = 0; /* No description. */ |
| 1786 | i_note.type = NT_VERSION; |
| 1787 | p = frag_more (sizeof (e_note.namesz)); |
| 1788 | md_number_to_chars (p, i_note.namesz, sizeof (e_note.namesz)); |
| 1789 | p = frag_more (sizeof (e_note.descsz)); |
| 1790 | md_number_to_chars (p, i_note.descsz, sizeof (e_note.descsz)); |
| 1791 | p = frag_more (sizeof (e_note.type)); |
| 1792 | md_number_to_chars (p, i_note.type, sizeof (e_note.type)); |
| 1793 | p = frag_more (len); |
| 1794 | memcpy (p, name, len); |
| 1795 | |
| 1796 | frag_align (2, 0, 0); |
| 1797 | |
| 1798 | subseg_set (seg, subseg); |
| 1799 | } |
| 1800 | else |
| 1801 | as_bad (_("expected quoted string")); |
| 1802 | |
| 1803 | demand_empty_rest_of_line (); |
| 1804 | } |
| 1805 | |
| 1806 | static void |
| 1807 | obj_elf_size (int ignore ATTRIBUTE_UNUSED) |
| 1808 | { |
| 1809 | char *name; |
| 1810 | char c = get_symbol_name (&name); |
| 1811 | char *p; |
| 1812 | expressionS exp; |
| 1813 | symbolS *sym; |
| 1814 | |
| 1815 | p = input_line_pointer; |
| 1816 | *p = c; |
| 1817 | SKIP_WHITESPACE_AFTER_NAME (); |
| 1818 | if (*input_line_pointer != ',') |
| 1819 | { |
| 1820 | *p = 0; |
| 1821 | as_bad (_("expected comma after name `%s' in .size directive"), name); |
| 1822 | *p = c; |
| 1823 | ignore_rest_of_line (); |
| 1824 | return; |
| 1825 | } |
| 1826 | input_line_pointer++; |
| 1827 | expression (&exp); |
| 1828 | if (exp.X_op == O_absent) |
| 1829 | { |
| 1830 | as_bad (_("missing expression in .size directive")); |
| 1831 | exp.X_op = O_constant; |
| 1832 | exp.X_add_number = 0; |
| 1833 | } |
| 1834 | *p = 0; |
| 1835 | sym = symbol_find_or_make (name); |
| 1836 | *p = c; |
| 1837 | if (exp.X_op == O_constant) |
| 1838 | { |
| 1839 | S_SET_SIZE (sym, exp.X_add_number); |
| 1840 | if (symbol_get_obj (sym)->size) |
| 1841 | { |
| 1842 | xfree (symbol_get_obj (sym)->size); |
| 1843 | symbol_get_obj (sym)->size = NULL; |
| 1844 | } |
| 1845 | } |
| 1846 | else |
| 1847 | { |
| 1848 | symbol_get_obj (sym)->size = XNEW (expressionS); |
| 1849 | *symbol_get_obj (sym)->size = exp; |
| 1850 | } |
| 1851 | demand_empty_rest_of_line (); |
| 1852 | } |
| 1853 | |
| 1854 | /* Handle the ELF .type pseudo-op. This sets the type of a symbol. |
| 1855 | There are six syntaxes: |
| 1856 | |
| 1857 | The first (used on Solaris) is |
| 1858 | .type SYM,#function |
| 1859 | The second (used on UnixWare) is |
| 1860 | .type SYM,@function |
| 1861 | The third (reportedly to be used on Irix 6.0) is |
| 1862 | .type SYM STT_FUNC |
| 1863 | The fourth (used on NetBSD/Arm and Linux/ARM) is |
| 1864 | .type SYM,%function |
| 1865 | The fifth (used on SVR4/860) is |
| 1866 | .type SYM,"function" |
| 1867 | The sixth (emitted by recent SunPRO under Solaris) is |
| 1868 | .type SYM,[0-9] |
| 1869 | where the integer is the STT_* value. |
| 1870 | */ |
| 1871 | |
| 1872 | static char * |
| 1873 | obj_elf_type_name (char *cp) |
| 1874 | { |
| 1875 | char *p; |
| 1876 | |
| 1877 | p = input_line_pointer; |
| 1878 | if (*input_line_pointer >= '0' |
| 1879 | && *input_line_pointer <= '9') |
| 1880 | { |
| 1881 | while (*input_line_pointer >= '0' |
| 1882 | && *input_line_pointer <= '9') |
| 1883 | ++input_line_pointer; |
| 1884 | *cp = *input_line_pointer; |
| 1885 | *input_line_pointer = '\0'; |
| 1886 | } |
| 1887 | else |
| 1888 | *cp = get_symbol_name (&p); |
| 1889 | |
| 1890 | return p; |
| 1891 | } |
| 1892 | |
| 1893 | static void |
| 1894 | obj_elf_type (int ignore ATTRIBUTE_UNUSED) |
| 1895 | { |
| 1896 | char c; |
| 1897 | int type; |
| 1898 | const char *type_name; |
| 1899 | symbolS *sym; |
| 1900 | elf_symbol_type *elfsym; |
| 1901 | |
| 1902 | sym = get_sym_from_input_line_and_check (); |
| 1903 | c = *input_line_pointer; |
| 1904 | elfsym = (elf_symbol_type *) symbol_get_bfdsym (sym); |
| 1905 | |
| 1906 | if (*input_line_pointer == ',') |
| 1907 | ++input_line_pointer; |
| 1908 | |
| 1909 | SKIP_WHITESPACE (); |
| 1910 | if ( *input_line_pointer == '#' |
| 1911 | || *input_line_pointer == '@' |
| 1912 | || *input_line_pointer == '"' |
| 1913 | || *input_line_pointer == '%') |
| 1914 | ++input_line_pointer; |
| 1915 | |
| 1916 | type_name = obj_elf_type_name (& c); |
| 1917 | |
| 1918 | type = 0; |
| 1919 | if (strcmp (type_name, "function") == 0 |
| 1920 | || strcmp (type_name, "2") == 0 |
| 1921 | || strcmp (type_name, "STT_FUNC") == 0) |
| 1922 | type = BSF_FUNCTION; |
| 1923 | else if (strcmp (type_name, "object") == 0 |
| 1924 | || strcmp (type_name, "1") == 0 |
| 1925 | || strcmp (type_name, "STT_OBJECT") == 0) |
| 1926 | type = BSF_OBJECT; |
| 1927 | else if (strcmp (type_name, "tls_object") == 0 |
| 1928 | || strcmp (type_name, "6") == 0 |
| 1929 | || strcmp (type_name, "STT_TLS") == 0) |
| 1930 | type = BSF_OBJECT | BSF_THREAD_LOCAL; |
| 1931 | else if (strcmp (type_name, "notype") == 0 |
| 1932 | || strcmp (type_name, "0") == 0 |
| 1933 | || strcmp (type_name, "STT_NOTYPE") == 0) |
| 1934 | ; |
| 1935 | else if (strcmp (type_name, "common") == 0 |
| 1936 | || strcmp (type_name, "5") == 0 |
| 1937 | || strcmp (type_name, "STT_COMMON") == 0) |
| 1938 | { |
| 1939 | type = BSF_OBJECT; |
| 1940 | |
| 1941 | if (! S_IS_COMMON (sym)) |
| 1942 | { |
| 1943 | if (S_IS_VOLATILE (sym)) |
| 1944 | { |
| 1945 | sym = symbol_clone (sym, 1); |
| 1946 | S_SET_SEGMENT (sym, bfd_com_section_ptr); |
| 1947 | S_SET_VALUE (sym, 0); |
| 1948 | S_SET_EXTERNAL (sym); |
| 1949 | symbol_set_frag (sym, &zero_address_frag); |
| 1950 | S_CLEAR_VOLATILE (sym); |
| 1951 | } |
| 1952 | else if (S_IS_DEFINED (sym) || symbol_equated_p (sym)) |
| 1953 | as_bad (_("symbol '%s' is already defined"), S_GET_NAME (sym)); |
| 1954 | else |
| 1955 | { |
| 1956 | /* FIXME: Is it safe to just change the section ? */ |
| 1957 | S_SET_SEGMENT (sym, bfd_com_section_ptr); |
| 1958 | S_SET_VALUE (sym, 0); |
| 1959 | S_SET_EXTERNAL (sym); |
| 1960 | } |
| 1961 | } |
| 1962 | } |
| 1963 | else if (strcmp (type_name, "gnu_indirect_function") == 0 |
| 1964 | || strcmp (type_name, "10") == 0 |
| 1965 | || strcmp (type_name, "STT_GNU_IFUNC") == 0) |
| 1966 | { |
| 1967 | const struct elf_backend_data *bed; |
| 1968 | |
| 1969 | bed = get_elf_backend_data (stdoutput); |
| 1970 | if (!(bed->elf_osabi == ELFOSABI_GNU |
| 1971 | || bed->elf_osabi == ELFOSABI_FREEBSD |
| 1972 | /* GNU is still using the default value 0. */ |
| 1973 | || bed->elf_osabi == ELFOSABI_NONE)) |
| 1974 | as_bad (_("symbol type \"%s\" is supported only by GNU and FreeBSD targets"), |
| 1975 | type_name); |
| 1976 | type = BSF_FUNCTION | BSF_GNU_INDIRECT_FUNCTION; |
| 1977 | } |
| 1978 | else if (strcmp (type_name, "gnu_unique_object") == 0) |
| 1979 | { |
| 1980 | struct elf_backend_data *bed; |
| 1981 | |
| 1982 | bed = (struct elf_backend_data *) get_elf_backend_data (stdoutput); |
| 1983 | if (!(bed->elf_osabi == ELFOSABI_GNU |
| 1984 | /* GNU is still using the default value 0. */ |
| 1985 | || bed->elf_osabi == ELFOSABI_NONE)) |
| 1986 | as_bad (_("symbol type \"%s\" is supported only by GNU targets"), |
| 1987 | type_name); |
| 1988 | type = BSF_OBJECT | BSF_GNU_UNIQUE; |
| 1989 | /* PR 10549: Always set OSABI field to GNU for objects containing unique symbols. */ |
| 1990 | bed->elf_osabi = ELFOSABI_GNU; |
| 1991 | } |
| 1992 | #ifdef md_elf_symbol_type |
| 1993 | else if ((type = md_elf_symbol_type (type_name, sym, elfsym)) != -1) |
| 1994 | ; |
| 1995 | #endif |
| 1996 | else |
| 1997 | as_bad (_("unrecognized symbol type \"%s\""), type_name); |
| 1998 | |
| 1999 | *input_line_pointer = c; |
| 2000 | |
| 2001 | if (*input_line_pointer == '"') |
| 2002 | ++input_line_pointer; |
| 2003 | |
| 2004 | elfsym->symbol.flags |= type; |
| 2005 | |
| 2006 | demand_empty_rest_of_line (); |
| 2007 | } |
| 2008 | |
| 2009 | static void |
| 2010 | obj_elf_ident (int ignore ATTRIBUTE_UNUSED) |
| 2011 | { |
| 2012 | static segT comment_section; |
| 2013 | segT old_section = now_seg; |
| 2014 | int old_subsection = now_subseg; |
| 2015 | |
| 2016 | #ifdef md_flush_pending_output |
| 2017 | md_flush_pending_output (); |
| 2018 | #endif |
| 2019 | |
| 2020 | if (!comment_section) |
| 2021 | { |
| 2022 | char *p; |
| 2023 | comment_section = subseg_new (".comment", 0); |
| 2024 | bfd_set_section_flags (stdoutput, comment_section, |
| 2025 | SEC_READONLY | SEC_HAS_CONTENTS |
| 2026 | | SEC_MERGE | SEC_STRINGS); |
| 2027 | comment_section->entsize = 1; |
| 2028 | #ifdef md_elf_section_change_hook |
| 2029 | md_elf_section_change_hook (); |
| 2030 | #endif |
| 2031 | p = frag_more (1); |
| 2032 | *p = 0; |
| 2033 | } |
| 2034 | else |
| 2035 | subseg_set (comment_section, 0); |
| 2036 | stringer (8 + 1); |
| 2037 | subseg_set (old_section, old_subsection); |
| 2038 | } |
| 2039 | |
| 2040 | #ifdef INIT_STAB_SECTION |
| 2041 | |
| 2042 | /* The first entry in a .stabs section is special. */ |
| 2043 | |
| 2044 | void |
| 2045 | obj_elf_init_stab_section (segT seg) |
| 2046 | { |
| 2047 | const char *file; |
| 2048 | char *p; |
| 2049 | char *stabstr_name; |
| 2050 | unsigned int stroff; |
| 2051 | |
| 2052 | /* Force the section to align to a longword boundary. Without this, |
| 2053 | UnixWare ar crashes. */ |
| 2054 | bfd_set_section_alignment (stdoutput, seg, 2); |
| 2055 | |
| 2056 | /* Make space for this first symbol. */ |
| 2057 | p = frag_more (12); |
| 2058 | /* Zero it out. */ |
| 2059 | memset (p, 0, 12); |
| 2060 | file = as_where (NULL); |
| 2061 | stabstr_name = concat (segment_name (seg), "str", (char *) NULL); |
| 2062 | stroff = get_stab_string_offset (file, stabstr_name); |
| 2063 | know (stroff == 1 || (stroff == 0 && file[0] == '\0')); |
| 2064 | md_number_to_chars (p, stroff, 4); |
| 2065 | seg_info (seg)->stabu.p = p; |
| 2066 | } |
| 2067 | |
| 2068 | #endif |
| 2069 | |
| 2070 | /* Fill in the counts in the first entry in a .stabs section. */ |
| 2071 | |
| 2072 | static void |
| 2073 | adjust_stab_sections (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED) |
| 2074 | { |
| 2075 | char *name; |
| 2076 | asection *strsec; |
| 2077 | char *p; |
| 2078 | int strsz, nsyms; |
| 2079 | |
| 2080 | if (strncmp (".stab", sec->name, 5)) |
| 2081 | return; |
| 2082 | if (!strcmp ("str", sec->name + strlen (sec->name) - 3)) |
| 2083 | return; |
| 2084 | |
| 2085 | name = concat (sec->name, "str", NULL); |
| 2086 | strsec = bfd_get_section_by_name (abfd, name); |
| 2087 | if (strsec) |
| 2088 | strsz = bfd_section_size (abfd, strsec); |
| 2089 | else |
| 2090 | strsz = 0; |
| 2091 | nsyms = bfd_section_size (abfd, sec) / 12 - 1; |
| 2092 | |
| 2093 | p = seg_info (sec)->stabu.p; |
| 2094 | gas_assert (p != 0); |
| 2095 | |
| 2096 | bfd_h_put_16 (abfd, nsyms, p + 6); |
| 2097 | bfd_h_put_32 (abfd, strsz, p + 8); |
| 2098 | free (name); |
| 2099 | } |
| 2100 | |
| 2101 | #ifdef NEED_ECOFF_DEBUG |
| 2102 | |
| 2103 | /* This function is called by the ECOFF code. It is supposed to |
| 2104 | record the external symbol information so that the backend can |
| 2105 | write it out correctly. The ELF backend doesn't actually handle |
| 2106 | this at the moment, so we do it ourselves. We save the information |
| 2107 | in the symbol. */ |
| 2108 | |
| 2109 | #ifdef OBJ_MAYBE_ELF |
| 2110 | static |
| 2111 | #endif |
| 2112 | void |
| 2113 | elf_ecoff_set_ext (symbolS *sym, struct ecoff_extr *ext) |
| 2114 | { |
| 2115 | symbol_get_bfdsym (sym)->udata.p = ext; |
| 2116 | } |
| 2117 | |
| 2118 | /* This function is called by bfd_ecoff_debug_externals. It is |
| 2119 | supposed to *EXT to the external symbol information, and return |
| 2120 | whether the symbol should be used at all. */ |
| 2121 | |
| 2122 | static bfd_boolean |
| 2123 | elf_get_extr (asymbol *sym, EXTR *ext) |
| 2124 | { |
| 2125 | if (sym->udata.p == NULL) |
| 2126 | return FALSE; |
| 2127 | *ext = *(EXTR *) sym->udata.p; |
| 2128 | return TRUE; |
| 2129 | } |
| 2130 | |
| 2131 | /* This function is called by bfd_ecoff_debug_externals. It has |
| 2132 | nothing to do for ELF. */ |
| 2133 | |
| 2134 | static void |
| 2135 | elf_set_index (asymbol *sym ATTRIBUTE_UNUSED, |
| 2136 | bfd_size_type indx ATTRIBUTE_UNUSED) |
| 2137 | { |
| 2138 | } |
| 2139 | |
| 2140 | #endif /* NEED_ECOFF_DEBUG */ |
| 2141 | |
| 2142 | void |
| 2143 | elf_frob_symbol (symbolS *symp, int *puntp) |
| 2144 | { |
| 2145 | struct elf_obj_sy *sy_obj; |
| 2146 | expressionS *size; |
| 2147 | |
| 2148 | #ifdef NEED_ECOFF_DEBUG |
| 2149 | if (ECOFF_DEBUGGING) |
| 2150 | ecoff_frob_symbol (symp); |
| 2151 | #endif |
| 2152 | |
| 2153 | sy_obj = symbol_get_obj (symp); |
| 2154 | |
| 2155 | size = sy_obj->size; |
| 2156 | if (size != NULL) |
| 2157 | { |
| 2158 | if (resolve_expression (size) |
| 2159 | && size->X_op == O_constant) |
| 2160 | S_SET_SIZE (symp, size->X_add_number); |
| 2161 | else |
| 2162 | { |
| 2163 | if (!flag_allow_nonconst_size) |
| 2164 | as_bad (_(".size expression for %s " |
| 2165 | "does not evaluate to a constant"), S_GET_NAME (symp)); |
| 2166 | else |
| 2167 | as_warn (_(".size expression for %s " |
| 2168 | "does not evaluate to a constant"), S_GET_NAME (symp)); |
| 2169 | } |
| 2170 | free (sy_obj->size); |
| 2171 | sy_obj->size = NULL; |
| 2172 | } |
| 2173 | |
| 2174 | if (sy_obj->versioned_name != NULL) |
| 2175 | { |
| 2176 | char *p; |
| 2177 | |
| 2178 | p = strchr (sy_obj->versioned_name, ELF_VER_CHR); |
| 2179 | if (p == NULL) |
| 2180 | /* We will have already reported an error about a missing version. */ |
| 2181 | *puntp = TRUE; |
| 2182 | |
| 2183 | /* This symbol was given a new name with the .symver directive. |
| 2184 | |
| 2185 | If this is an external reference, just rename the symbol to |
| 2186 | include the version string. This will make the relocs be |
| 2187 | against the correct versioned symbol. |
| 2188 | |
| 2189 | If this is a definition, add an alias. FIXME: Using an alias |
| 2190 | will permit the debugging information to refer to the right |
| 2191 | symbol. However, it's not clear whether it is the best |
| 2192 | approach. */ |
| 2193 | |
| 2194 | else if (! S_IS_DEFINED (symp)) |
| 2195 | { |
| 2196 | /* Verify that the name isn't using the @@ syntax--this is |
| 2197 | reserved for definitions of the default version to link |
| 2198 | against. */ |
| 2199 | if (p[1] == ELF_VER_CHR) |
| 2200 | { |
| 2201 | as_bad (_("invalid attempt to declare external version name" |
| 2202 | " as default in symbol `%s'"), |
| 2203 | sy_obj->versioned_name); |
| 2204 | *puntp = TRUE; |
| 2205 | } |
| 2206 | S_SET_NAME (symp, sy_obj->versioned_name); |
| 2207 | } |
| 2208 | else |
| 2209 | { |
| 2210 | if (p[1] == ELF_VER_CHR && p[2] == ELF_VER_CHR) |
| 2211 | { |
| 2212 | size_t l; |
| 2213 | |
| 2214 | /* The @@@ syntax is a special case. It renames the |
| 2215 | symbol name to versioned_name with one `@' removed. */ |
| 2216 | l = strlen (&p[3]) + 1; |
| 2217 | memmove (&p[2], &p[3], l); |
| 2218 | S_SET_NAME (symp, sy_obj->versioned_name); |
| 2219 | } |
| 2220 | else |
| 2221 | { |
| 2222 | symbolS *symp2; |
| 2223 | |
| 2224 | /* FIXME: Creating a new symbol here is risky. We're |
| 2225 | in the final loop over the symbol table. We can |
| 2226 | get away with it only because the symbol goes to |
| 2227 | the end of the list, where the loop will still see |
| 2228 | it. It would probably be better to do this in |
| 2229 | obj_frob_file_before_adjust. */ |
| 2230 | |
| 2231 | symp2 = symbol_find_or_make (sy_obj->versioned_name); |
| 2232 | |
| 2233 | /* Now we act as though we saw symp2 = sym. */ |
| 2234 | |
| 2235 | S_SET_SEGMENT (symp2, S_GET_SEGMENT (symp)); |
| 2236 | |
| 2237 | /* Subtracting out the frag address here is a hack |
| 2238 | because we are in the middle of the final loop. */ |
| 2239 | S_SET_VALUE (symp2, |
| 2240 | (S_GET_VALUE (symp) |
| 2241 | - symbol_get_frag (symp)->fr_address)); |
| 2242 | |
| 2243 | symbol_set_frag (symp2, symbol_get_frag (symp)); |
| 2244 | |
| 2245 | /* This will copy over the size information. */ |
| 2246 | copy_symbol_attributes (symp2, symp); |
| 2247 | |
| 2248 | S_SET_OTHER (symp2, S_GET_OTHER (symp)); |
| 2249 | |
| 2250 | if (S_IS_WEAK (symp)) |
| 2251 | S_SET_WEAK (symp2); |
| 2252 | |
| 2253 | if (S_IS_EXTERNAL (symp)) |
| 2254 | S_SET_EXTERNAL (symp2); |
| 2255 | } |
| 2256 | } |
| 2257 | } |
| 2258 | |
| 2259 | /* Double check weak symbols. */ |
| 2260 | if (S_IS_WEAK (symp)) |
| 2261 | { |
| 2262 | if (S_IS_COMMON (symp)) |
| 2263 | as_bad (_("symbol `%s' can not be both weak and common"), |
| 2264 | S_GET_NAME (symp)); |
| 2265 | } |
| 2266 | |
| 2267 | #ifdef TC_MIPS |
| 2268 | /* The Irix 5 and 6 assemblers set the type of any common symbol and |
| 2269 | any undefined non-function symbol to STT_OBJECT. We try to be |
| 2270 | compatible, since newer Irix 5 and 6 linkers care. However, we |
| 2271 | only set undefined symbols to be STT_OBJECT if we are on Irix, |
| 2272 | because that is the only time gcc will generate the necessary |
| 2273 | .global directives to mark functions. */ |
| 2274 | |
| 2275 | if (S_IS_COMMON (symp)) |
| 2276 | symbol_get_bfdsym (symp)->flags |= BSF_OBJECT; |
| 2277 | |
| 2278 | if (strstr (TARGET_OS, "irix") != NULL |
| 2279 | && ! S_IS_DEFINED (symp) |
| 2280 | && (symbol_get_bfdsym (symp)->flags & BSF_FUNCTION) == 0) |
| 2281 | symbol_get_bfdsym (symp)->flags |= BSF_OBJECT; |
| 2282 | #endif |
| 2283 | } |
| 2284 | |
| 2285 | struct group_list |
| 2286 | { |
| 2287 | asection **head; /* Section lists. */ |
| 2288 | unsigned int *elt_count; /* Number of sections in each list. */ |
| 2289 | unsigned int num_group; /* Number of lists. */ |
| 2290 | struct hash_control *indexes; /* Maps group name to index in head array. */ |
| 2291 | }; |
| 2292 | |
| 2293 | /* Called via bfd_map_over_sections. If SEC is a member of a group, |
| 2294 | add it to a list of sections belonging to the group. INF is a |
| 2295 | pointer to a struct group_list, which is where we store the head of |
| 2296 | each list. */ |
| 2297 | |
| 2298 | static void |
| 2299 | build_group_lists (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf) |
| 2300 | { |
| 2301 | struct group_list *list = (struct group_list *) inf; |
| 2302 | const char *group_name = elf_group_name (sec); |
| 2303 | unsigned int i; |
| 2304 | unsigned int *elem_idx; |
| 2305 | unsigned int *idx_ptr; |
| 2306 | |
| 2307 | if (group_name == NULL) |
| 2308 | return; |
| 2309 | |
| 2310 | /* If this group already has a list, add the section to the head of |
| 2311 | the list. */ |
| 2312 | elem_idx = (unsigned int *) hash_find (list->indexes, group_name); |
| 2313 | if (elem_idx != NULL) |
| 2314 | { |
| 2315 | elf_next_in_group (sec) = list->head[*elem_idx]; |
| 2316 | list->head[*elem_idx] = sec; |
| 2317 | list->elt_count[*elem_idx] += 1; |
| 2318 | return; |
| 2319 | } |
| 2320 | |
| 2321 | /* New group. Make the arrays bigger in chunks to minimize calls to |
| 2322 | realloc. */ |
| 2323 | i = list->num_group; |
| 2324 | if ((i & 127) == 0) |
| 2325 | { |
| 2326 | unsigned int newsize = i + 128; |
| 2327 | list->head = (asection **) xrealloc (list->head, |
| 2328 | newsize * sizeof (*list->head)); |
| 2329 | list->elt_count = (unsigned int *) |
| 2330 | xrealloc (list->elt_count, newsize * sizeof (*list->elt_count)); |
| 2331 | } |
| 2332 | list->head[i] = sec; |
| 2333 | list->elt_count[i] = 1; |
| 2334 | list->num_group += 1; |
| 2335 | |
| 2336 | /* Add index to hash. */ |
| 2337 | idx_ptr = XNEW (unsigned int); |
| 2338 | *idx_ptr = i; |
| 2339 | hash_insert (list->indexes, group_name, idx_ptr); |
| 2340 | } |
| 2341 | |
| 2342 | static void free_section_idx (const char *key ATTRIBUTE_UNUSED, void *val) |
| 2343 | { |
| 2344 | free ((unsigned int *) val); |
| 2345 | } |
| 2346 | |
| 2347 | void |
| 2348 | elf_adjust_symtab (void) |
| 2349 | { |
| 2350 | struct group_list list; |
| 2351 | unsigned int i; |
| 2352 | |
| 2353 | /* Go find section groups. */ |
| 2354 | list.num_group = 0; |
| 2355 | list.head = NULL; |
| 2356 | list.elt_count = NULL; |
| 2357 | list.indexes = hash_new (); |
| 2358 | bfd_map_over_sections (stdoutput, build_group_lists, &list); |
| 2359 | |
| 2360 | /* Make the SHT_GROUP sections that describe each section group. We |
| 2361 | can't set up the section contents here yet, because elf section |
| 2362 | indices have yet to be calculated. elf.c:set_group_contents does |
| 2363 | the rest of the work. */ |
| 2364 | for (i = 0; i < list.num_group; i++) |
| 2365 | { |
| 2366 | const char *group_name = elf_group_name (list.head[i]); |
| 2367 | const char *sec_name; |
| 2368 | asection *s; |
| 2369 | flagword flags; |
| 2370 | struct symbol *sy; |
| 2371 | bfd_size_type size; |
| 2372 | |
| 2373 | flags = SEC_READONLY | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_GROUP; |
| 2374 | for (s = list.head[i]; s != NULL; s = elf_next_in_group (s)) |
| 2375 | if ((s->flags ^ flags) & SEC_LINK_ONCE) |
| 2376 | { |
| 2377 | flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD; |
| 2378 | if (s != list.head[i]) |
| 2379 | { |
| 2380 | as_warn (_("assuming all members of group `%s' are COMDAT"), |
| 2381 | group_name); |
| 2382 | break; |
| 2383 | } |
| 2384 | } |
| 2385 | |
| 2386 | sec_name = ".group"; |
| 2387 | s = subseg_force_new (sec_name, 0); |
| 2388 | if (s == NULL |
| 2389 | || !bfd_set_section_flags (stdoutput, s, flags) |
| 2390 | || !bfd_set_section_alignment (stdoutput, s, 2)) |
| 2391 | { |
| 2392 | as_fatal (_("can't create group: %s"), |
| 2393 | bfd_errmsg (bfd_get_error ())); |
| 2394 | } |
| 2395 | elf_section_type (s) = SHT_GROUP; |
| 2396 | |
| 2397 | /* Pass a pointer to the first section in this group. */ |
| 2398 | elf_next_in_group (s) = list.head[i]; |
| 2399 | /* Make sure that the signature symbol for the group has the |
| 2400 | name of the group. */ |
| 2401 | sy = symbol_find_exact (group_name); |
| 2402 | if (!sy |
| 2403 | || (sy != symbol_lastP |
| 2404 | && (sy->sy_next == NULL |
| 2405 | || sy->sy_next->sy_previous != sy))) |
| 2406 | { |
| 2407 | /* Create the symbol now. */ |
| 2408 | sy = symbol_new (group_name, now_seg, (valueT) 0, frag_now); |
| 2409 | #ifdef TE_SOLARIS |
| 2410 | /* Before Solaris 11 build 154, Sun ld rejects local group |
| 2411 | signature symbols, so make them weak hidden instead. */ |
| 2412 | symbol_get_bfdsym (sy)->flags |= BSF_WEAK; |
| 2413 | S_SET_OTHER (sy, STV_HIDDEN); |
| 2414 | #else |
| 2415 | symbol_get_obj (sy)->local = 1; |
| 2416 | #endif |
| 2417 | symbol_table_insert (sy); |
| 2418 | } |
| 2419 | elf_group_id (s) = symbol_get_bfdsym (sy); |
| 2420 | |
| 2421 | size = 4 * (list.elt_count[i] + 1); |
| 2422 | bfd_set_section_size (stdoutput, s, size); |
| 2423 | s->contents = (unsigned char *) frag_more (size); |
| 2424 | frag_now->fr_fix = frag_now_fix_octets (); |
| 2425 | frag_wane (frag_now); |
| 2426 | } |
| 2427 | |
| 2428 | /* Cleanup hash. */ |
| 2429 | hash_traverse (list.indexes, free_section_idx); |
| 2430 | hash_die (list.indexes); |
| 2431 | } |
| 2432 | |
| 2433 | void |
| 2434 | elf_frob_file (void) |
| 2435 | { |
| 2436 | bfd_map_over_sections (stdoutput, adjust_stab_sections, NULL); |
| 2437 | |
| 2438 | #ifdef elf_tc_final_processing |
| 2439 | elf_tc_final_processing (); |
| 2440 | #endif |
| 2441 | } |
| 2442 | |
| 2443 | /* It removes any unneeded versioned symbols from the symbol table. */ |
| 2444 | |
| 2445 | void |
| 2446 | elf_frob_file_before_adjust (void) |
| 2447 | { |
| 2448 | if (symbol_rootP) |
| 2449 | { |
| 2450 | symbolS *symp; |
| 2451 | |
| 2452 | for (symp = symbol_rootP; symp; symp = symbol_next (symp)) |
| 2453 | if (!S_IS_DEFINED (symp)) |
| 2454 | { |
| 2455 | if (symbol_get_obj (symp)->versioned_name) |
| 2456 | { |
| 2457 | char *p; |
| 2458 | |
| 2459 | /* The @@@ syntax is a special case. If the symbol is |
| 2460 | not defined, 2 `@'s will be removed from the |
| 2461 | versioned_name. */ |
| 2462 | |
| 2463 | p = strchr (symbol_get_obj (symp)->versioned_name, |
| 2464 | ELF_VER_CHR); |
| 2465 | if (p != NULL && p[1] == ELF_VER_CHR && p[2] == ELF_VER_CHR) |
| 2466 | { |
| 2467 | size_t l = strlen (&p[3]) + 1; |
| 2468 | memmove (&p[1], &p[3], l); |
| 2469 | } |
| 2470 | if (symbol_used_p (symp) == 0 |
| 2471 | && symbol_used_in_reloc_p (symp) == 0) |
| 2472 | symbol_remove (symp, &symbol_rootP, &symbol_lastP); |
| 2473 | } |
| 2474 | |
| 2475 | /* If there was .weak foo, but foo was neither defined nor |
| 2476 | used anywhere, remove it. */ |
| 2477 | |
| 2478 | else if (S_IS_WEAK (symp) |
| 2479 | && symbol_used_p (symp) == 0 |
| 2480 | && symbol_used_in_reloc_p (symp) == 0) |
| 2481 | symbol_remove (symp, &symbol_rootP, &symbol_lastP); |
| 2482 | } |
| 2483 | } |
| 2484 | } |
| 2485 | |
| 2486 | /* It is required that we let write_relocs have the opportunity to |
| 2487 | optimize away fixups before output has begun, since it is possible |
| 2488 | to eliminate all fixups for a section and thus we never should |
| 2489 | have generated the relocation section. */ |
| 2490 | |
| 2491 | void |
| 2492 | elf_frob_file_after_relocs (void) |
| 2493 | { |
| 2494 | #ifdef NEED_ECOFF_DEBUG |
| 2495 | if (ECOFF_DEBUGGING) |
| 2496 | /* Generate the ECOFF debugging information. */ |
| 2497 | { |
| 2498 | const struct ecoff_debug_swap *debug_swap; |
| 2499 | struct ecoff_debug_info debug; |
| 2500 | char *buf; |
| 2501 | asection *sec; |
| 2502 | |
| 2503 | debug_swap |
| 2504 | = get_elf_backend_data (stdoutput)->elf_backend_ecoff_debug_swap; |
| 2505 | know (debug_swap != NULL); |
| 2506 | ecoff_build_debug (&debug.symbolic_header, &buf, debug_swap); |
| 2507 | |
| 2508 | /* Set up the pointers in debug. */ |
| 2509 | #define SET(ptr, offset, type) \ |
| 2510 | debug.ptr = (type) (buf + debug.symbolic_header.offset) |
| 2511 | |
| 2512 | SET (line, cbLineOffset, unsigned char *); |
| 2513 | SET (external_dnr, cbDnOffset, void *); |
| 2514 | SET (external_pdr, cbPdOffset, void *); |
| 2515 | SET (external_sym, cbSymOffset, void *); |
| 2516 | SET (external_opt, cbOptOffset, void *); |
| 2517 | SET (external_aux, cbAuxOffset, union aux_ext *); |
| 2518 | SET (ss, cbSsOffset, char *); |
| 2519 | SET (external_fdr, cbFdOffset, void *); |
| 2520 | SET (external_rfd, cbRfdOffset, void *); |
| 2521 | /* ssext and external_ext are set up just below. */ |
| 2522 | |
| 2523 | #undef SET |
| 2524 | |
| 2525 | /* Set up the external symbols. */ |
| 2526 | debug.ssext = debug.ssext_end = NULL; |
| 2527 | debug.external_ext = debug.external_ext_end = NULL; |
| 2528 | if (! bfd_ecoff_debug_externals (stdoutput, &debug, debug_swap, TRUE, |
| 2529 | elf_get_extr, elf_set_index)) |
| 2530 | as_fatal (_("failed to set up debugging information: %s"), |
| 2531 | bfd_errmsg (bfd_get_error ())); |
| 2532 | |
| 2533 | sec = bfd_get_section_by_name (stdoutput, ".mdebug"); |
| 2534 | gas_assert (sec != NULL); |
| 2535 | |
| 2536 | know (!stdoutput->output_has_begun); |
| 2537 | |
| 2538 | /* We set the size of the section, call bfd_set_section_contents |
| 2539 | to force the ELF backend to allocate a file position, and then |
| 2540 | write out the data. FIXME: Is this really the best way to do |
| 2541 | this? */ |
| 2542 | bfd_set_section_size |
| 2543 | (stdoutput, sec, bfd_ecoff_debug_size (stdoutput, &debug, debug_swap)); |
| 2544 | |
| 2545 | /* Pass BUF to bfd_set_section_contents because this will |
| 2546 | eventually become a call to fwrite, and ISO C prohibits |
| 2547 | passing a NULL pointer to a stdio function even if the |
| 2548 | pointer will not be used. */ |
| 2549 | if (! bfd_set_section_contents (stdoutput, sec, buf, 0, 0)) |
| 2550 | as_fatal (_("can't start writing .mdebug section: %s"), |
| 2551 | bfd_errmsg (bfd_get_error ())); |
| 2552 | |
| 2553 | know (stdoutput->output_has_begun); |
| 2554 | know (sec->filepos != 0); |
| 2555 | |
| 2556 | if (! bfd_ecoff_write_debug (stdoutput, &debug, debug_swap, |
| 2557 | sec->filepos)) |
| 2558 | as_fatal (_("could not write .mdebug section: %s"), |
| 2559 | bfd_errmsg (bfd_get_error ())); |
| 2560 | } |
| 2561 | #endif /* NEED_ECOFF_DEBUG */ |
| 2562 | } |
| 2563 | |
| 2564 | #ifdef SCO_ELF |
| 2565 | |
| 2566 | /* Heavily plagiarized from obj_elf_version. The idea is to emit the |
| 2567 | SCO specific identifier in the .notes section to satisfy the SCO |
| 2568 | linker. |
| 2569 | |
| 2570 | This looks more complicated than it really is. As opposed to the |
| 2571 | "obvious" solution, this should handle the cross dev cases |
| 2572 | correctly. (i.e, hosting on a 64 bit big endian processor, but |
| 2573 | generating SCO Elf code) Efficiency isn't a concern, as there |
| 2574 | should be exactly one of these sections per object module. |
| 2575 | |
| 2576 | SCO OpenServer 5 identifies it's ELF modules with a standard ELF |
| 2577 | .note section. |
| 2578 | |
| 2579 | int_32 namesz = 4 ; Name size |
| 2580 | int_32 descsz = 12 ; Descriptive information |
| 2581 | int_32 type = 1 ; |
| 2582 | char name[4] = "SCO" ; Originator name ALWAYS SCO + NULL |
| 2583 | int_32 version = (major ver # << 16) | version of tools ; |
| 2584 | int_32 source = (tool_id << 16 ) | 1 ; |
| 2585 | int_32 info = 0 ; These are set by the SCO tools, but we |
| 2586 | don't know enough about the source |
| 2587 | environment to set them. SCO ld currently |
| 2588 | ignores them, and recommends we set them |
| 2589 | to zero. */ |
| 2590 | |
| 2591 | #define SCO_MAJOR_VERSION 0x1 |
| 2592 | #define SCO_MINOR_VERSION 0x1 |
| 2593 | |
| 2594 | void |
| 2595 | sco_id (void) |
| 2596 | { |
| 2597 | |
| 2598 | char *name; |
| 2599 | unsigned int c; |
| 2600 | char ch; |
| 2601 | char *p; |
| 2602 | asection *seg = now_seg; |
| 2603 | subsegT subseg = now_subseg; |
| 2604 | Elf_Internal_Note i_note; |
| 2605 | Elf_External_Note e_note; |
| 2606 | asection *note_secp = NULL; |
| 2607 | int i, len; |
| 2608 | |
| 2609 | /* create the .note section */ |
| 2610 | |
| 2611 | note_secp = subseg_new (".note", 0); |
| 2612 | bfd_set_section_flags (stdoutput, |
| 2613 | note_secp, |
| 2614 | SEC_HAS_CONTENTS | SEC_READONLY); |
| 2615 | |
| 2616 | /* process the version string */ |
| 2617 | |
| 2618 | i_note.namesz = 4; |
| 2619 | i_note.descsz = 12; /* 12 descriptive bytes */ |
| 2620 | i_note.type = NT_VERSION; /* Contains a version string */ |
| 2621 | |
| 2622 | p = frag_more (sizeof (i_note.namesz)); |
| 2623 | md_number_to_chars (p, i_note.namesz, 4); |
| 2624 | |
| 2625 | p = frag_more (sizeof (i_note.descsz)); |
| 2626 | md_number_to_chars (p, i_note.descsz, 4); |
| 2627 | |
| 2628 | p = frag_more (sizeof (i_note.type)); |
| 2629 | md_number_to_chars (p, i_note.type, 4); |
| 2630 | |
| 2631 | p = frag_more (4); |
| 2632 | strcpy (p, "SCO"); |
| 2633 | |
| 2634 | /* Note: this is the version number of the ELF we're representing */ |
| 2635 | p = frag_more (4); |
| 2636 | md_number_to_chars (p, (SCO_MAJOR_VERSION << 16) | (SCO_MINOR_VERSION), 4); |
| 2637 | |
| 2638 | /* Here, we pick a magic number for ourselves (yes, I "registered" |
| 2639 | it with SCO. The bottom bit shows that we are compat with the |
| 2640 | SCO ABI. */ |
| 2641 | p = frag_more (4); |
| 2642 | md_number_to_chars (p, 0x4c520000 | 0x0001, 4); |
| 2643 | |
| 2644 | /* If we knew (or cared) what the source language options were, we'd |
| 2645 | fill them in here. SCO has given us permission to ignore these |
| 2646 | and just set them to zero. */ |
| 2647 | p = frag_more (4); |
| 2648 | md_number_to_chars (p, 0x0000, 4); |
| 2649 | |
| 2650 | frag_align (2, 0, 0); |
| 2651 | |
| 2652 | /* We probably can't restore the current segment, for there likely |
| 2653 | isn't one yet... */ |
| 2654 | if (seg && subseg) |
| 2655 | subseg_set (seg, subseg); |
| 2656 | |
| 2657 | } |
| 2658 | |
| 2659 | #endif /* SCO_ELF */ |
| 2660 | |
| 2661 | static void |
| 2662 | elf_generate_asm_lineno (void) |
| 2663 | { |
| 2664 | #ifdef NEED_ECOFF_DEBUG |
| 2665 | if (ECOFF_DEBUGGING) |
| 2666 | ecoff_generate_asm_lineno (); |
| 2667 | #endif |
| 2668 | } |
| 2669 | |
| 2670 | static void |
| 2671 | elf_process_stab (segT sec ATTRIBUTE_UNUSED, |
| 2672 | int what ATTRIBUTE_UNUSED, |
| 2673 | const char *string ATTRIBUTE_UNUSED, |
| 2674 | int type ATTRIBUTE_UNUSED, |
| 2675 | int other ATTRIBUTE_UNUSED, |
| 2676 | int desc ATTRIBUTE_UNUSED) |
| 2677 | { |
| 2678 | #ifdef NEED_ECOFF_DEBUG |
| 2679 | if (ECOFF_DEBUGGING) |
| 2680 | ecoff_stab (sec, what, string, type, other, desc); |
| 2681 | #endif |
| 2682 | } |
| 2683 | |
| 2684 | static int |
| 2685 | elf_separate_stab_sections (void) |
| 2686 | { |
| 2687 | #ifdef NEED_ECOFF_DEBUG |
| 2688 | return (!ECOFF_DEBUGGING); |
| 2689 | #else |
| 2690 | return 1; |
| 2691 | #endif |
| 2692 | } |
| 2693 | |
| 2694 | static void |
| 2695 | elf_init_stab_section (segT seg) |
| 2696 | { |
| 2697 | #ifdef NEED_ECOFF_DEBUG |
| 2698 | if (!ECOFF_DEBUGGING) |
| 2699 | #endif |
| 2700 | obj_elf_init_stab_section (seg); |
| 2701 | } |
| 2702 | |
| 2703 | const struct format_ops elf_format_ops = |
| 2704 | { |
| 2705 | bfd_target_elf_flavour, |
| 2706 | 0, /* dfl_leading_underscore */ |
| 2707 | 1, /* emit_section_symbols */ |
| 2708 | elf_begin, |
| 2709 | elf_file_symbol, |
| 2710 | elf_frob_symbol, |
| 2711 | elf_frob_file, |
| 2712 | elf_frob_file_before_adjust, |
| 2713 | 0, /* obj_frob_file_before_fix */ |
| 2714 | elf_frob_file_after_relocs, |
| 2715 | elf_s_get_size, elf_s_set_size, |
| 2716 | elf_s_get_align, elf_s_set_align, |
| 2717 | elf_s_get_other, |
| 2718 | elf_s_set_other, |
| 2719 | 0, /* s_get_desc */ |
| 2720 | 0, /* s_set_desc */ |
| 2721 | 0, /* s_get_type */ |
| 2722 | 0, /* s_set_type */ |
| 2723 | elf_copy_symbol_attributes, |
| 2724 | elf_generate_asm_lineno, |
| 2725 | elf_process_stab, |
| 2726 | elf_separate_stab_sections, |
| 2727 | elf_init_stab_section, |
| 2728 | elf_sec_sym_ok_for_reloc, |
| 2729 | elf_pop_insert, |
| 2730 | #ifdef NEED_ECOFF_DEBUG |
| 2731 | elf_ecoff_set_ext, |
| 2732 | #else |
| 2733 | 0, /* ecoff_set_ext */ |
| 2734 | #endif |
| 2735 | elf_obj_read_begin_hook, |
| 2736 | elf_obj_symbol_new_hook, |
| 2737 | 0, |
| 2738 | elf_adjust_symtab |
| 2739 | }; |