| 1 | /* ELF linking support for BFD. |
| 2 | Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, |
| 3 | 2005, 2006 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 | #include "objalloc.h" |
| 30 | |
| 31 | /* Define a symbol in a dynamic linkage section. */ |
| 32 | |
| 33 | struct elf_link_hash_entry * |
| 34 | _bfd_elf_define_linkage_sym (bfd *abfd, |
| 35 | struct bfd_link_info *info, |
| 36 | asection *sec, |
| 37 | const char *name) |
| 38 | { |
| 39 | struct elf_link_hash_entry *h; |
| 40 | struct bfd_link_hash_entry *bh; |
| 41 | const struct elf_backend_data *bed; |
| 42 | |
| 43 | h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE); |
| 44 | if (h != NULL) |
| 45 | { |
| 46 | /* Zap symbol defined in an as-needed lib that wasn't linked. |
| 47 | This is a symptom of a larger problem: Absolute symbols |
| 48 | defined in shared libraries can't be overridden, because we |
| 49 | lose the link to the bfd which is via the symbol section. */ |
| 50 | h->root.type = bfd_link_hash_new; |
| 51 | } |
| 52 | |
| 53 | bh = &h->root; |
| 54 | if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL, |
| 55 | sec, 0, NULL, FALSE, |
| 56 | get_elf_backend_data (abfd)->collect, |
| 57 | &bh)) |
| 58 | return NULL; |
| 59 | h = (struct elf_link_hash_entry *) bh; |
| 60 | h->def_regular = 1; |
| 61 | h->type = STT_OBJECT; |
| 62 | h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN; |
| 63 | |
| 64 | bed = get_elf_backend_data (abfd); |
| 65 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 66 | return h; |
| 67 | } |
| 68 | |
| 69 | bfd_boolean |
| 70 | _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info) |
| 71 | { |
| 72 | flagword flags; |
| 73 | asection *s; |
| 74 | struct elf_link_hash_entry *h; |
| 75 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 76 | int ptralign; |
| 77 | |
| 78 | /* This function may be called more than once. */ |
| 79 | s = bfd_get_section_by_name (abfd, ".got"); |
| 80 | if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0) |
| 81 | return TRUE; |
| 82 | |
| 83 | switch (bed->s->arch_size) |
| 84 | { |
| 85 | case 32: |
| 86 | ptralign = 2; |
| 87 | break; |
| 88 | |
| 89 | case 64: |
| 90 | ptralign = 3; |
| 91 | break; |
| 92 | |
| 93 | default: |
| 94 | bfd_set_error (bfd_error_bad_value); |
| 95 | return FALSE; |
| 96 | } |
| 97 | |
| 98 | flags = bed->dynamic_sec_flags; |
| 99 | |
| 100 | s = bfd_make_section_with_flags (abfd, ".got", flags); |
| 101 | if (s == NULL |
| 102 | || !bfd_set_section_alignment (abfd, s, ptralign)) |
| 103 | return FALSE; |
| 104 | |
| 105 | if (bed->want_got_plt) |
| 106 | { |
| 107 | s = bfd_make_section_with_flags (abfd, ".got.plt", flags); |
| 108 | if (s == NULL |
| 109 | || !bfd_set_section_alignment (abfd, s, ptralign)) |
| 110 | return FALSE; |
| 111 | } |
| 112 | |
| 113 | if (bed->want_got_sym) |
| 114 | { |
| 115 | /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got |
| 116 | (or .got.plt) section. We don't do this in the linker script |
| 117 | because we don't want to define the symbol if we are not creating |
| 118 | a global offset table. */ |
| 119 | h = _bfd_elf_define_linkage_sym (abfd, info, s, "_GLOBAL_OFFSET_TABLE_"); |
| 120 | elf_hash_table (info)->hgot = h; |
| 121 | if (h == NULL) |
| 122 | return FALSE; |
| 123 | } |
| 124 | |
| 125 | /* The first bit of the global offset table is the header. */ |
| 126 | s->size += bed->got_header_size; |
| 127 | |
| 128 | return TRUE; |
| 129 | } |
| 130 | \f |
| 131 | /* Create a strtab to hold the dynamic symbol names. */ |
| 132 | static bfd_boolean |
| 133 | _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info) |
| 134 | { |
| 135 | struct elf_link_hash_table *hash_table; |
| 136 | |
| 137 | hash_table = elf_hash_table (info); |
| 138 | if (hash_table->dynobj == NULL) |
| 139 | hash_table->dynobj = abfd; |
| 140 | |
| 141 | if (hash_table->dynstr == NULL) |
| 142 | { |
| 143 | hash_table->dynstr = _bfd_elf_strtab_init (); |
| 144 | if (hash_table->dynstr == NULL) |
| 145 | return FALSE; |
| 146 | } |
| 147 | return TRUE; |
| 148 | } |
| 149 | |
| 150 | /* Create some sections which will be filled in with dynamic linking |
| 151 | information. ABFD is an input file which requires dynamic sections |
| 152 | to be created. The dynamic sections take up virtual memory space |
| 153 | when the final executable is run, so we need to create them before |
| 154 | addresses are assigned to the output sections. We work out the |
| 155 | actual contents and size of these sections later. */ |
| 156 | |
| 157 | bfd_boolean |
| 158 | _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) |
| 159 | { |
| 160 | flagword flags; |
| 161 | register asection *s; |
| 162 | const struct elf_backend_data *bed; |
| 163 | |
| 164 | if (! is_elf_hash_table (info->hash)) |
| 165 | return FALSE; |
| 166 | |
| 167 | if (elf_hash_table (info)->dynamic_sections_created) |
| 168 | return TRUE; |
| 169 | |
| 170 | if (!_bfd_elf_link_create_dynstrtab (abfd, info)) |
| 171 | return FALSE; |
| 172 | |
| 173 | abfd = elf_hash_table (info)->dynobj; |
| 174 | bed = get_elf_backend_data (abfd); |
| 175 | |
| 176 | flags = bed->dynamic_sec_flags; |
| 177 | |
| 178 | /* A dynamically linked executable has a .interp section, but a |
| 179 | shared library does not. */ |
| 180 | if (info->executable) |
| 181 | { |
| 182 | s = bfd_make_section_with_flags (abfd, ".interp", |
| 183 | flags | SEC_READONLY); |
| 184 | if (s == NULL) |
| 185 | return FALSE; |
| 186 | } |
| 187 | |
| 188 | if (! info->traditional_format) |
| 189 | { |
| 190 | s = bfd_make_section_with_flags (abfd, ".eh_frame_hdr", |
| 191 | flags | SEC_READONLY); |
| 192 | if (s == NULL |
| 193 | || ! bfd_set_section_alignment (abfd, s, 2)) |
| 194 | return FALSE; |
| 195 | elf_hash_table (info)->eh_info.hdr_sec = s; |
| 196 | } |
| 197 | |
| 198 | /* Create sections to hold version informations. These are removed |
| 199 | if they are not needed. */ |
| 200 | s = bfd_make_section_with_flags (abfd, ".gnu.version_d", |
| 201 | flags | SEC_READONLY); |
| 202 | if (s == NULL |
| 203 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 204 | return FALSE; |
| 205 | |
| 206 | s = bfd_make_section_with_flags (abfd, ".gnu.version", |
| 207 | flags | SEC_READONLY); |
| 208 | if (s == NULL |
| 209 | || ! bfd_set_section_alignment (abfd, s, 1)) |
| 210 | return FALSE; |
| 211 | |
| 212 | s = bfd_make_section_with_flags (abfd, ".gnu.version_r", |
| 213 | flags | SEC_READONLY); |
| 214 | if (s == NULL |
| 215 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 216 | return FALSE; |
| 217 | |
| 218 | s = bfd_make_section_with_flags (abfd, ".dynsym", |
| 219 | flags | SEC_READONLY); |
| 220 | if (s == NULL |
| 221 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 222 | return FALSE; |
| 223 | |
| 224 | s = bfd_make_section_with_flags (abfd, ".dynstr", |
| 225 | flags | SEC_READONLY); |
| 226 | if (s == NULL) |
| 227 | return FALSE; |
| 228 | |
| 229 | s = bfd_make_section_with_flags (abfd, ".dynamic", flags); |
| 230 | if (s == NULL |
| 231 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 232 | return FALSE; |
| 233 | |
| 234 | /* The special symbol _DYNAMIC is always set to the start of the |
| 235 | .dynamic section. We could set _DYNAMIC in a linker script, but we |
| 236 | only want to define it if we are, in fact, creating a .dynamic |
| 237 | section. We don't want to define it if there is no .dynamic |
| 238 | section, since on some ELF platforms the start up code examines it |
| 239 | to decide how to initialize the process. */ |
| 240 | if (!_bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC")) |
| 241 | return FALSE; |
| 242 | |
| 243 | s = bfd_make_section_with_flags (abfd, ".hash", |
| 244 | flags | SEC_READONLY); |
| 245 | if (s == NULL |
| 246 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 247 | return FALSE; |
| 248 | elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry; |
| 249 | |
| 250 | /* Let the backend create the rest of the sections. This lets the |
| 251 | backend set the right flags. The backend will normally create |
| 252 | the .got and .plt sections. */ |
| 253 | if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info)) |
| 254 | return FALSE; |
| 255 | |
| 256 | elf_hash_table (info)->dynamic_sections_created = TRUE; |
| 257 | |
| 258 | return TRUE; |
| 259 | } |
| 260 | |
| 261 | /* Create dynamic sections when linking against a dynamic object. */ |
| 262 | |
| 263 | bfd_boolean |
| 264 | _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) |
| 265 | { |
| 266 | flagword flags, pltflags; |
| 267 | struct elf_link_hash_entry *h; |
| 268 | asection *s; |
| 269 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 270 | |
| 271 | /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and |
| 272 | .rel[a].bss sections. */ |
| 273 | flags = bed->dynamic_sec_flags; |
| 274 | |
| 275 | pltflags = flags; |
| 276 | if (bed->plt_not_loaded) |
| 277 | /* We do not clear SEC_ALLOC here because we still want the OS to |
| 278 | allocate space for the section; it's just that there's nothing |
| 279 | to read in from the object file. */ |
| 280 | pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS); |
| 281 | else |
| 282 | pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD; |
| 283 | if (bed->plt_readonly) |
| 284 | pltflags |= SEC_READONLY; |
| 285 | |
| 286 | s = bfd_make_section_with_flags (abfd, ".plt", pltflags); |
| 287 | if (s == NULL |
| 288 | || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) |
| 289 | return FALSE; |
| 290 | |
| 291 | /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the |
| 292 | .plt section. */ |
| 293 | if (bed->want_plt_sym) |
| 294 | { |
| 295 | h = _bfd_elf_define_linkage_sym (abfd, info, s, |
| 296 | "_PROCEDURE_LINKAGE_TABLE_"); |
| 297 | elf_hash_table (info)->hplt = h; |
| 298 | if (h == NULL) |
| 299 | return FALSE; |
| 300 | } |
| 301 | |
| 302 | s = bfd_make_section_with_flags (abfd, |
| 303 | (bed->default_use_rela_p |
| 304 | ? ".rela.plt" : ".rel.plt"), |
| 305 | flags | SEC_READONLY); |
| 306 | if (s == NULL |
| 307 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 308 | return FALSE; |
| 309 | |
| 310 | if (! _bfd_elf_create_got_section (abfd, info)) |
| 311 | return FALSE; |
| 312 | |
| 313 | if (bed->want_dynbss) |
| 314 | { |
| 315 | /* The .dynbss section is a place to put symbols which are defined |
| 316 | by dynamic objects, are referenced by regular objects, and are |
| 317 | not functions. We must allocate space for them in the process |
| 318 | image and use a R_*_COPY reloc to tell the dynamic linker to |
| 319 | initialize them at run time. The linker script puts the .dynbss |
| 320 | section into the .bss section of the final image. */ |
| 321 | s = bfd_make_section_with_flags (abfd, ".dynbss", |
| 322 | (SEC_ALLOC |
| 323 | | SEC_LINKER_CREATED)); |
| 324 | if (s == NULL) |
| 325 | return FALSE; |
| 326 | |
| 327 | /* The .rel[a].bss section holds copy relocs. This section is not |
| 328 | normally needed. We need to create it here, though, so that the |
| 329 | linker will map it to an output section. We can't just create it |
| 330 | only if we need it, because we will not know whether we need it |
| 331 | until we have seen all the input files, and the first time the |
| 332 | main linker code calls BFD after examining all the input files |
| 333 | (size_dynamic_sections) the input sections have already been |
| 334 | mapped to the output sections. If the section turns out not to |
| 335 | be needed, we can discard it later. We will never need this |
| 336 | section when generating a shared object, since they do not use |
| 337 | copy relocs. */ |
| 338 | if (! info->shared) |
| 339 | { |
| 340 | s = bfd_make_section_with_flags (abfd, |
| 341 | (bed->default_use_rela_p |
| 342 | ? ".rela.bss" : ".rel.bss"), |
| 343 | flags | SEC_READONLY); |
| 344 | if (s == NULL |
| 345 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 346 | return FALSE; |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | return TRUE; |
| 351 | } |
| 352 | \f |
| 353 | /* Record a new dynamic symbol. We record the dynamic symbols as we |
| 354 | read the input files, since we need to have a list of all of them |
| 355 | before we can determine the final sizes of the output sections. |
| 356 | Note that we may actually call this function even though we are not |
| 357 | going to output any dynamic symbols; in some cases we know that a |
| 358 | symbol should be in the dynamic symbol table, but only if there is |
| 359 | one. */ |
| 360 | |
| 361 | bfd_boolean |
| 362 | bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info, |
| 363 | struct elf_link_hash_entry *h) |
| 364 | { |
| 365 | if (h->dynindx == -1) |
| 366 | { |
| 367 | struct elf_strtab_hash *dynstr; |
| 368 | char *p; |
| 369 | const char *name; |
| 370 | bfd_size_type indx; |
| 371 | |
| 372 | /* XXX: The ABI draft says the linker must turn hidden and |
| 373 | internal symbols into STB_LOCAL symbols when producing the |
| 374 | DSO. However, if ld.so honors st_other in the dynamic table, |
| 375 | this would not be necessary. */ |
| 376 | switch (ELF_ST_VISIBILITY (h->other)) |
| 377 | { |
| 378 | case STV_INTERNAL: |
| 379 | case STV_HIDDEN: |
| 380 | if (h->root.type != bfd_link_hash_undefined |
| 381 | && h->root.type != bfd_link_hash_undefweak) |
| 382 | { |
| 383 | h->forced_local = 1; |
| 384 | if (!elf_hash_table (info)->is_relocatable_executable) |
| 385 | return TRUE; |
| 386 | } |
| 387 | |
| 388 | default: |
| 389 | break; |
| 390 | } |
| 391 | |
| 392 | h->dynindx = elf_hash_table (info)->dynsymcount; |
| 393 | ++elf_hash_table (info)->dynsymcount; |
| 394 | |
| 395 | dynstr = elf_hash_table (info)->dynstr; |
| 396 | if (dynstr == NULL) |
| 397 | { |
| 398 | /* Create a strtab to hold the dynamic symbol names. */ |
| 399 | elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init (); |
| 400 | if (dynstr == NULL) |
| 401 | return FALSE; |
| 402 | } |
| 403 | |
| 404 | /* We don't put any version information in the dynamic string |
| 405 | table. */ |
| 406 | name = h->root.root.string; |
| 407 | p = strchr (name, ELF_VER_CHR); |
| 408 | if (p != NULL) |
| 409 | /* We know that the p points into writable memory. In fact, |
| 410 | there are only a few symbols that have read-only names, being |
| 411 | those like _GLOBAL_OFFSET_TABLE_ that are created specially |
| 412 | by the backends. Most symbols will have names pointing into |
| 413 | an ELF string table read from a file, or to objalloc memory. */ |
| 414 | *p = 0; |
| 415 | |
| 416 | indx = _bfd_elf_strtab_add (dynstr, name, p != NULL); |
| 417 | |
| 418 | if (p != NULL) |
| 419 | *p = ELF_VER_CHR; |
| 420 | |
| 421 | if (indx == (bfd_size_type) -1) |
| 422 | return FALSE; |
| 423 | h->dynstr_index = indx; |
| 424 | } |
| 425 | |
| 426 | return TRUE; |
| 427 | } |
| 428 | \f |
| 429 | /* Record an assignment to a symbol made by a linker script. We need |
| 430 | this in case some dynamic object refers to this symbol. */ |
| 431 | |
| 432 | bfd_boolean |
| 433 | bfd_elf_record_link_assignment (bfd *output_bfd, |
| 434 | struct bfd_link_info *info, |
| 435 | const char *name, |
| 436 | bfd_boolean provide, |
| 437 | bfd_boolean hidden) |
| 438 | { |
| 439 | struct elf_link_hash_entry *h; |
| 440 | struct elf_link_hash_table *htab; |
| 441 | |
| 442 | if (!is_elf_hash_table (info->hash)) |
| 443 | return TRUE; |
| 444 | |
| 445 | htab = elf_hash_table (info); |
| 446 | h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE); |
| 447 | if (h == NULL) |
| 448 | return provide; |
| 449 | |
| 450 | /* Since we're defining the symbol, don't let it seem to have not |
| 451 | been defined. record_dynamic_symbol and size_dynamic_sections |
| 452 | may depend on this. */ |
| 453 | if (h->root.type == bfd_link_hash_undefweak |
| 454 | || h->root.type == bfd_link_hash_undefined) |
| 455 | { |
| 456 | h->root.type = bfd_link_hash_new; |
| 457 | if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root) |
| 458 | bfd_link_repair_undef_list (&htab->root); |
| 459 | } |
| 460 | |
| 461 | if (h->root.type == bfd_link_hash_new) |
| 462 | h->non_elf = 0; |
| 463 | |
| 464 | /* If this symbol is being provided by the linker script, and it is |
| 465 | currently defined by a dynamic object, but not by a regular |
| 466 | object, then mark it as undefined so that the generic linker will |
| 467 | force the correct value. */ |
| 468 | if (provide |
| 469 | && h->def_dynamic |
| 470 | && !h->def_regular) |
| 471 | h->root.type = bfd_link_hash_undefined; |
| 472 | |
| 473 | /* If this symbol is not being provided by the linker script, and it is |
| 474 | currently defined by a dynamic object, but not by a regular object, |
| 475 | then clear out any version information because the symbol will not be |
| 476 | associated with the dynamic object any more. */ |
| 477 | if (!provide |
| 478 | && h->def_dynamic |
| 479 | && !h->def_regular) |
| 480 | h->verinfo.verdef = NULL; |
| 481 | |
| 482 | h->def_regular = 1; |
| 483 | |
| 484 | if (provide && hidden) |
| 485 | { |
| 486 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); |
| 487 | |
| 488 | h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN; |
| 489 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 490 | } |
| 491 | |
| 492 | /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects |
| 493 | and executables. */ |
| 494 | if (!info->relocatable |
| 495 | && h->dynindx != -1 |
| 496 | && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN |
| 497 | || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)) |
| 498 | h->forced_local = 1; |
| 499 | |
| 500 | if ((h->def_dynamic |
| 501 | || h->ref_dynamic |
| 502 | || info->shared |
| 503 | || (info->executable && elf_hash_table (info)->is_relocatable_executable)) |
| 504 | && h->dynindx == -1) |
| 505 | { |
| 506 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 507 | return FALSE; |
| 508 | |
| 509 | /* If this is a weak defined symbol, and we know a corresponding |
| 510 | real symbol from the same dynamic object, make sure the real |
| 511 | symbol is also made into a dynamic symbol. */ |
| 512 | if (h->u.weakdef != NULL |
| 513 | && h->u.weakdef->dynindx == -1) |
| 514 | { |
| 515 | if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef)) |
| 516 | return FALSE; |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | return TRUE; |
| 521 | } |
| 522 | |
| 523 | /* Record a new local dynamic symbol. Returns 0 on failure, 1 on |
| 524 | success, and 2 on a failure caused by attempting to record a symbol |
| 525 | in a discarded section, eg. a discarded link-once section symbol. */ |
| 526 | |
| 527 | int |
| 528 | bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info, |
| 529 | bfd *input_bfd, |
| 530 | long input_indx) |
| 531 | { |
| 532 | bfd_size_type amt; |
| 533 | struct elf_link_local_dynamic_entry *entry; |
| 534 | struct elf_link_hash_table *eht; |
| 535 | struct elf_strtab_hash *dynstr; |
| 536 | unsigned long dynstr_index; |
| 537 | char *name; |
| 538 | Elf_External_Sym_Shndx eshndx; |
| 539 | char esym[sizeof (Elf64_External_Sym)]; |
| 540 | |
| 541 | if (! is_elf_hash_table (info->hash)) |
| 542 | return 0; |
| 543 | |
| 544 | /* See if the entry exists already. */ |
| 545 | for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next) |
| 546 | if (entry->input_bfd == input_bfd && entry->input_indx == input_indx) |
| 547 | return 1; |
| 548 | |
| 549 | amt = sizeof (*entry); |
| 550 | entry = bfd_alloc (input_bfd, amt); |
| 551 | if (entry == NULL) |
| 552 | return 0; |
| 553 | |
| 554 | /* Go find the symbol, so that we can find it's name. */ |
| 555 | if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr, |
| 556 | 1, input_indx, &entry->isym, esym, &eshndx)) |
| 557 | { |
| 558 | bfd_release (input_bfd, entry); |
| 559 | return 0; |
| 560 | } |
| 561 | |
| 562 | if (entry->isym.st_shndx != SHN_UNDEF |
| 563 | && (entry->isym.st_shndx < SHN_LORESERVE |
| 564 | || entry->isym.st_shndx > SHN_HIRESERVE)) |
| 565 | { |
| 566 | asection *s; |
| 567 | |
| 568 | s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx); |
| 569 | if (s == NULL || bfd_is_abs_section (s->output_section)) |
| 570 | { |
| 571 | /* We can still bfd_release here as nothing has done another |
| 572 | bfd_alloc. We can't do this later in this function. */ |
| 573 | bfd_release (input_bfd, entry); |
| 574 | return 2; |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | name = (bfd_elf_string_from_elf_section |
| 579 | (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link, |
| 580 | entry->isym.st_name)); |
| 581 | |
| 582 | dynstr = elf_hash_table (info)->dynstr; |
| 583 | if (dynstr == NULL) |
| 584 | { |
| 585 | /* Create a strtab to hold the dynamic symbol names. */ |
| 586 | elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init (); |
| 587 | if (dynstr == NULL) |
| 588 | return 0; |
| 589 | } |
| 590 | |
| 591 | dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE); |
| 592 | if (dynstr_index == (unsigned long) -1) |
| 593 | return 0; |
| 594 | entry->isym.st_name = dynstr_index; |
| 595 | |
| 596 | eht = elf_hash_table (info); |
| 597 | |
| 598 | entry->next = eht->dynlocal; |
| 599 | eht->dynlocal = entry; |
| 600 | entry->input_bfd = input_bfd; |
| 601 | entry->input_indx = input_indx; |
| 602 | eht->dynsymcount++; |
| 603 | |
| 604 | /* Whatever binding the symbol had before, it's now local. */ |
| 605 | entry->isym.st_info |
| 606 | = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info)); |
| 607 | |
| 608 | /* The dynindx will be set at the end of size_dynamic_sections. */ |
| 609 | |
| 610 | return 1; |
| 611 | } |
| 612 | |
| 613 | /* Return the dynindex of a local dynamic symbol. */ |
| 614 | |
| 615 | long |
| 616 | _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info, |
| 617 | bfd *input_bfd, |
| 618 | long input_indx) |
| 619 | { |
| 620 | struct elf_link_local_dynamic_entry *e; |
| 621 | |
| 622 | for (e = elf_hash_table (info)->dynlocal; e ; e = e->next) |
| 623 | if (e->input_bfd == input_bfd && e->input_indx == input_indx) |
| 624 | return e->dynindx; |
| 625 | return -1; |
| 626 | } |
| 627 | |
| 628 | /* This function is used to renumber the dynamic symbols, if some of |
| 629 | them are removed because they are marked as local. This is called |
| 630 | via elf_link_hash_traverse. */ |
| 631 | |
| 632 | static bfd_boolean |
| 633 | elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h, |
| 634 | void *data) |
| 635 | { |
| 636 | size_t *count = data; |
| 637 | |
| 638 | if (h->root.type == bfd_link_hash_warning) |
| 639 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 640 | |
| 641 | if (h->forced_local) |
| 642 | return TRUE; |
| 643 | |
| 644 | if (h->dynindx != -1) |
| 645 | h->dynindx = ++(*count); |
| 646 | |
| 647 | return TRUE; |
| 648 | } |
| 649 | |
| 650 | |
| 651 | /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with |
| 652 | STB_LOCAL binding. */ |
| 653 | |
| 654 | static bfd_boolean |
| 655 | elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h, |
| 656 | void *data) |
| 657 | { |
| 658 | size_t *count = data; |
| 659 | |
| 660 | if (h->root.type == bfd_link_hash_warning) |
| 661 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 662 | |
| 663 | if (!h->forced_local) |
| 664 | return TRUE; |
| 665 | |
| 666 | if (h->dynindx != -1) |
| 667 | h->dynindx = ++(*count); |
| 668 | |
| 669 | return TRUE; |
| 670 | } |
| 671 | |
| 672 | /* Return true if the dynamic symbol for a given section should be |
| 673 | omitted when creating a shared library. */ |
| 674 | bfd_boolean |
| 675 | _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 676 | struct bfd_link_info *info, |
| 677 | asection *p) |
| 678 | { |
| 679 | switch (elf_section_data (p)->this_hdr.sh_type) |
| 680 | { |
| 681 | case SHT_PROGBITS: |
| 682 | case SHT_NOBITS: |
| 683 | /* If sh_type is yet undecided, assume it could be |
| 684 | SHT_PROGBITS/SHT_NOBITS. */ |
| 685 | case SHT_NULL: |
| 686 | if (strcmp (p->name, ".got") == 0 |
| 687 | || strcmp (p->name, ".got.plt") == 0 |
| 688 | || strcmp (p->name, ".plt") == 0) |
| 689 | { |
| 690 | asection *ip; |
| 691 | bfd *dynobj = elf_hash_table (info)->dynobj; |
| 692 | |
| 693 | if (dynobj != NULL |
| 694 | && (ip = bfd_get_section_by_name (dynobj, p->name)) != NULL |
| 695 | && (ip->flags & SEC_LINKER_CREATED) |
| 696 | && ip->output_section == p) |
| 697 | return TRUE; |
| 698 | } |
| 699 | return FALSE; |
| 700 | |
| 701 | /* There shouldn't be section relative relocations |
| 702 | against any other section. */ |
| 703 | default: |
| 704 | return TRUE; |
| 705 | } |
| 706 | } |
| 707 | |
| 708 | /* Assign dynsym indices. In a shared library we generate a section |
| 709 | symbol for each output section, which come first. Next come symbols |
| 710 | which have been forced to local binding. Then all of the back-end |
| 711 | allocated local dynamic syms, followed by the rest of the global |
| 712 | symbols. */ |
| 713 | |
| 714 | static unsigned long |
| 715 | _bfd_elf_link_renumber_dynsyms (bfd *output_bfd, |
| 716 | struct bfd_link_info *info, |
| 717 | unsigned long *section_sym_count) |
| 718 | { |
| 719 | unsigned long dynsymcount = 0; |
| 720 | |
| 721 | if (info->shared || elf_hash_table (info)->is_relocatable_executable) |
| 722 | { |
| 723 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); |
| 724 | asection *p; |
| 725 | for (p = output_bfd->sections; p ; p = p->next) |
| 726 | if ((p->flags & SEC_EXCLUDE) == 0 |
| 727 | && (p->flags & SEC_ALLOC) != 0 |
| 728 | && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p)) |
| 729 | elf_section_data (p)->dynindx = ++dynsymcount; |
| 730 | } |
| 731 | *section_sym_count = dynsymcount; |
| 732 | |
| 733 | elf_link_hash_traverse (elf_hash_table (info), |
| 734 | elf_link_renumber_local_hash_table_dynsyms, |
| 735 | &dynsymcount); |
| 736 | |
| 737 | if (elf_hash_table (info)->dynlocal) |
| 738 | { |
| 739 | struct elf_link_local_dynamic_entry *p; |
| 740 | for (p = elf_hash_table (info)->dynlocal; p ; p = p->next) |
| 741 | p->dynindx = ++dynsymcount; |
| 742 | } |
| 743 | |
| 744 | elf_link_hash_traverse (elf_hash_table (info), |
| 745 | elf_link_renumber_hash_table_dynsyms, |
| 746 | &dynsymcount); |
| 747 | |
| 748 | /* There is an unused NULL entry at the head of the table which |
| 749 | we must account for in our count. Unless there weren't any |
| 750 | symbols, which means we'll have no table at all. */ |
| 751 | if (dynsymcount != 0) |
| 752 | ++dynsymcount; |
| 753 | |
| 754 | elf_hash_table (info)->dynsymcount = dynsymcount; |
| 755 | return dynsymcount; |
| 756 | } |
| 757 | |
| 758 | /* This function is called when we want to define a new symbol. It |
| 759 | handles the various cases which arise when we find a definition in |
| 760 | a dynamic object, or when there is already a definition in a |
| 761 | dynamic object. The new symbol is described by NAME, SYM, PSEC, |
| 762 | and PVALUE. We set SYM_HASH to the hash table entry. We set |
| 763 | OVERRIDE if the old symbol is overriding a new definition. We set |
| 764 | TYPE_CHANGE_OK if it is OK for the type to change. We set |
| 765 | SIZE_CHANGE_OK if it is OK for the size to change. By OK to |
| 766 | change, we mean that we shouldn't warn if the type or size does |
| 767 | change. We set POLD_ALIGNMENT if an old common symbol in a dynamic |
| 768 | object is overridden by a regular object. */ |
| 769 | |
| 770 | bfd_boolean |
| 771 | _bfd_elf_merge_symbol (bfd *abfd, |
| 772 | struct bfd_link_info *info, |
| 773 | const char *name, |
| 774 | Elf_Internal_Sym *sym, |
| 775 | asection **psec, |
| 776 | bfd_vma *pvalue, |
| 777 | unsigned int *pold_alignment, |
| 778 | struct elf_link_hash_entry **sym_hash, |
| 779 | bfd_boolean *skip, |
| 780 | bfd_boolean *override, |
| 781 | bfd_boolean *type_change_ok, |
| 782 | bfd_boolean *size_change_ok) |
| 783 | { |
| 784 | asection *sec, *oldsec; |
| 785 | struct elf_link_hash_entry *h; |
| 786 | struct elf_link_hash_entry *flip; |
| 787 | int bind; |
| 788 | bfd *oldbfd; |
| 789 | bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon; |
| 790 | bfd_boolean newweak, oldweak; |
| 791 | const struct elf_backend_data *bed; |
| 792 | |
| 793 | *skip = FALSE; |
| 794 | *override = FALSE; |
| 795 | |
| 796 | sec = *psec; |
| 797 | bind = ELF_ST_BIND (sym->st_info); |
| 798 | |
| 799 | if (! bfd_is_und_section (sec)) |
| 800 | h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE); |
| 801 | else |
| 802 | h = ((struct elf_link_hash_entry *) |
| 803 | bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE)); |
| 804 | if (h == NULL) |
| 805 | return FALSE; |
| 806 | *sym_hash = h; |
| 807 | |
| 808 | /* This code is for coping with dynamic objects, and is only useful |
| 809 | if we are doing an ELF link. */ |
| 810 | if (info->hash->creator != abfd->xvec) |
| 811 | return TRUE; |
| 812 | |
| 813 | /* For merging, we only care about real symbols. */ |
| 814 | |
| 815 | while (h->root.type == bfd_link_hash_indirect |
| 816 | || h->root.type == bfd_link_hash_warning) |
| 817 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 818 | |
| 819 | /* If we just created the symbol, mark it as being an ELF symbol. |
| 820 | Other than that, there is nothing to do--there is no merge issue |
| 821 | with a newly defined symbol--so we just return. */ |
| 822 | |
| 823 | if (h->root.type == bfd_link_hash_new) |
| 824 | { |
| 825 | h->non_elf = 0; |
| 826 | return TRUE; |
| 827 | } |
| 828 | |
| 829 | /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the |
| 830 | existing symbol. */ |
| 831 | |
| 832 | switch (h->root.type) |
| 833 | { |
| 834 | default: |
| 835 | oldbfd = NULL; |
| 836 | oldsec = NULL; |
| 837 | break; |
| 838 | |
| 839 | case bfd_link_hash_undefined: |
| 840 | case bfd_link_hash_undefweak: |
| 841 | oldbfd = h->root.u.undef.abfd; |
| 842 | oldsec = NULL; |
| 843 | break; |
| 844 | |
| 845 | case bfd_link_hash_defined: |
| 846 | case bfd_link_hash_defweak: |
| 847 | oldbfd = h->root.u.def.section->owner; |
| 848 | oldsec = h->root.u.def.section; |
| 849 | break; |
| 850 | |
| 851 | case bfd_link_hash_common: |
| 852 | oldbfd = h->root.u.c.p->section->owner; |
| 853 | oldsec = h->root.u.c.p->section; |
| 854 | break; |
| 855 | } |
| 856 | |
| 857 | /* In cases involving weak versioned symbols, we may wind up trying |
| 858 | to merge a symbol with itself. Catch that here, to avoid the |
| 859 | confusion that results if we try to override a symbol with |
| 860 | itself. The additional tests catch cases like |
| 861 | _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a |
| 862 | dynamic object, which we do want to handle here. */ |
| 863 | if (abfd == oldbfd |
| 864 | && ((abfd->flags & DYNAMIC) == 0 |
| 865 | || !h->def_regular)) |
| 866 | return TRUE; |
| 867 | |
| 868 | /* NEWDYN and OLDDYN indicate whether the new or old symbol, |
| 869 | respectively, is from a dynamic object. */ |
| 870 | |
| 871 | newdyn = (abfd->flags & DYNAMIC) != 0; |
| 872 | |
| 873 | olddyn = FALSE; |
| 874 | if (oldbfd != NULL) |
| 875 | olddyn = (oldbfd->flags & DYNAMIC) != 0; |
| 876 | else if (oldsec != NULL) |
| 877 | { |
| 878 | /* This handles the special SHN_MIPS_{TEXT,DATA} section |
| 879 | indices used by MIPS ELF. */ |
| 880 | olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0; |
| 881 | } |
| 882 | |
| 883 | /* NEWDEF and OLDDEF indicate whether the new or old symbol, |
| 884 | respectively, appear to be a definition rather than reference. */ |
| 885 | |
| 886 | newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec); |
| 887 | |
| 888 | olddef = (h->root.type != bfd_link_hash_undefined |
| 889 | && h->root.type != bfd_link_hash_undefweak |
| 890 | && h->root.type != bfd_link_hash_common); |
| 891 | |
| 892 | /* When we try to create a default indirect symbol from the dynamic |
| 893 | definition with the default version, we skip it if its type and |
| 894 | the type of existing regular definition mismatch. We only do it |
| 895 | if the existing regular definition won't be dynamic. */ |
| 896 | if (pold_alignment == NULL |
| 897 | && !info->shared |
| 898 | && !info->export_dynamic |
| 899 | && !h->ref_dynamic |
| 900 | && newdyn |
| 901 | && newdef |
| 902 | && !olddyn |
| 903 | && (olddef || h->root.type == bfd_link_hash_common) |
| 904 | && ELF_ST_TYPE (sym->st_info) != h->type |
| 905 | && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE |
| 906 | && h->type != STT_NOTYPE) |
| 907 | { |
| 908 | *skip = TRUE; |
| 909 | return TRUE; |
| 910 | } |
| 911 | |
| 912 | /* Check TLS symbol. We don't check undefined symbol introduced by |
| 913 | "ld -u". */ |
| 914 | if ((ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS) |
| 915 | && ELF_ST_TYPE (sym->st_info) != h->type |
| 916 | && oldbfd != NULL) |
| 917 | { |
| 918 | bfd *ntbfd, *tbfd; |
| 919 | bfd_boolean ntdef, tdef; |
| 920 | asection *ntsec, *tsec; |
| 921 | |
| 922 | if (h->type == STT_TLS) |
| 923 | { |
| 924 | ntbfd = abfd; |
| 925 | ntsec = sec; |
| 926 | ntdef = newdef; |
| 927 | tbfd = oldbfd; |
| 928 | tsec = oldsec; |
| 929 | tdef = olddef; |
| 930 | } |
| 931 | else |
| 932 | { |
| 933 | ntbfd = oldbfd; |
| 934 | ntsec = oldsec; |
| 935 | ntdef = olddef; |
| 936 | tbfd = abfd; |
| 937 | tsec = sec; |
| 938 | tdef = newdef; |
| 939 | } |
| 940 | |
| 941 | if (tdef && ntdef) |
| 942 | (*_bfd_error_handler) |
| 943 | (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"), |
| 944 | tbfd, tsec, ntbfd, ntsec, h->root.root.string); |
| 945 | else if (!tdef && !ntdef) |
| 946 | (*_bfd_error_handler) |
| 947 | (_("%s: TLS reference in %B mismatches non-TLS reference in %B"), |
| 948 | tbfd, ntbfd, h->root.root.string); |
| 949 | else if (tdef) |
| 950 | (*_bfd_error_handler) |
| 951 | (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"), |
| 952 | tbfd, tsec, ntbfd, h->root.root.string); |
| 953 | else |
| 954 | (*_bfd_error_handler) |
| 955 | (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"), |
| 956 | tbfd, ntbfd, ntsec, h->root.root.string); |
| 957 | |
| 958 | bfd_set_error (bfd_error_bad_value); |
| 959 | return FALSE; |
| 960 | } |
| 961 | |
| 962 | /* We need to remember if a symbol has a definition in a dynamic |
| 963 | object or is weak in all dynamic objects. Internal and hidden |
| 964 | visibility will make it unavailable to dynamic objects. */ |
| 965 | if (newdyn && !h->dynamic_def) |
| 966 | { |
| 967 | if (!bfd_is_und_section (sec)) |
| 968 | h->dynamic_def = 1; |
| 969 | else |
| 970 | { |
| 971 | /* Check if this symbol is weak in all dynamic objects. If it |
| 972 | is the first time we see it in a dynamic object, we mark |
| 973 | if it is weak. Otherwise, we clear it. */ |
| 974 | if (!h->ref_dynamic) |
| 975 | { |
| 976 | if (bind == STB_WEAK) |
| 977 | h->dynamic_weak = 1; |
| 978 | } |
| 979 | else if (bind != STB_WEAK) |
| 980 | h->dynamic_weak = 0; |
| 981 | } |
| 982 | } |
| 983 | |
| 984 | /* If the old symbol has non-default visibility, we ignore the new |
| 985 | definition from a dynamic object. */ |
| 986 | if (newdyn |
| 987 | && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 988 | && !bfd_is_und_section (sec)) |
| 989 | { |
| 990 | *skip = TRUE; |
| 991 | /* Make sure this symbol is dynamic. */ |
| 992 | h->ref_dynamic = 1; |
| 993 | /* A protected symbol has external availability. Make sure it is |
| 994 | recorded as dynamic. |
| 995 | |
| 996 | FIXME: Should we check type and size for protected symbol? */ |
| 997 | if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| 998 | return bfd_elf_link_record_dynamic_symbol (info, h); |
| 999 | else |
| 1000 | return TRUE; |
| 1001 | } |
| 1002 | else if (!newdyn |
| 1003 | && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT |
| 1004 | && h->def_dynamic) |
| 1005 | { |
| 1006 | /* If the new symbol with non-default visibility comes from a |
| 1007 | relocatable file and the old definition comes from a dynamic |
| 1008 | object, we remove the old definition. */ |
| 1009 | if ((*sym_hash)->root.type == bfd_link_hash_indirect) |
| 1010 | h = *sym_hash; |
| 1011 | |
| 1012 | if ((h->root.u.undef.next || info->hash->undefs_tail == &h->root) |
| 1013 | && bfd_is_und_section (sec)) |
| 1014 | { |
| 1015 | /* If the new symbol is undefined and the old symbol was |
| 1016 | also undefined before, we need to make sure |
| 1017 | _bfd_generic_link_add_one_symbol doesn't mess |
| 1018 | up the linker hash table undefs list. Since the old |
| 1019 | definition came from a dynamic object, it is still on the |
| 1020 | undefs list. */ |
| 1021 | h->root.type = bfd_link_hash_undefined; |
| 1022 | h->root.u.undef.abfd = abfd; |
| 1023 | } |
| 1024 | else |
| 1025 | { |
| 1026 | h->root.type = bfd_link_hash_new; |
| 1027 | h->root.u.undef.abfd = NULL; |
| 1028 | } |
| 1029 | |
| 1030 | if (h->def_dynamic) |
| 1031 | { |
| 1032 | h->def_dynamic = 0; |
| 1033 | h->ref_dynamic = 1; |
| 1034 | h->dynamic_def = 1; |
| 1035 | } |
| 1036 | /* FIXME: Should we check type and size for protected symbol? */ |
| 1037 | h->size = 0; |
| 1038 | h->type = 0; |
| 1039 | return TRUE; |
| 1040 | } |
| 1041 | |
| 1042 | /* Differentiate strong and weak symbols. */ |
| 1043 | newweak = bind == STB_WEAK; |
| 1044 | oldweak = (h->root.type == bfd_link_hash_defweak |
| 1045 | || h->root.type == bfd_link_hash_undefweak); |
| 1046 | |
| 1047 | /* If a new weak symbol definition comes from a regular file and the |
| 1048 | old symbol comes from a dynamic library, we treat the new one as |
| 1049 | strong. Similarly, an old weak symbol definition from a regular |
| 1050 | file is treated as strong when the new symbol comes from a dynamic |
| 1051 | library. Further, an old weak symbol from a dynamic library is |
| 1052 | treated as strong if the new symbol is from a dynamic library. |
| 1053 | This reflects the way glibc's ld.so works. |
| 1054 | |
| 1055 | Do this before setting *type_change_ok or *size_change_ok so that |
| 1056 | we warn properly when dynamic library symbols are overridden. */ |
| 1057 | |
| 1058 | if (newdef && !newdyn && olddyn) |
| 1059 | newweak = FALSE; |
| 1060 | if (olddef && newdyn) |
| 1061 | oldweak = FALSE; |
| 1062 | |
| 1063 | /* It's OK to change the type if either the existing symbol or the |
| 1064 | new symbol is weak. A type change is also OK if the old symbol |
| 1065 | is undefined and the new symbol is defined. */ |
| 1066 | |
| 1067 | if (oldweak |
| 1068 | || newweak |
| 1069 | || (newdef |
| 1070 | && h->root.type == bfd_link_hash_undefined)) |
| 1071 | *type_change_ok = TRUE; |
| 1072 | |
| 1073 | /* It's OK to change the size if either the existing symbol or the |
| 1074 | new symbol is weak, or if the old symbol is undefined. */ |
| 1075 | |
| 1076 | if (*type_change_ok |
| 1077 | || h->root.type == bfd_link_hash_undefined) |
| 1078 | *size_change_ok = TRUE; |
| 1079 | |
| 1080 | /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old |
| 1081 | symbol, respectively, appears to be a common symbol in a dynamic |
| 1082 | object. If a symbol appears in an uninitialized section, and is |
| 1083 | not weak, and is not a function, then it may be a common symbol |
| 1084 | which was resolved when the dynamic object was created. We want |
| 1085 | to treat such symbols specially, because they raise special |
| 1086 | considerations when setting the symbol size: if the symbol |
| 1087 | appears as a common symbol in a regular object, and the size in |
| 1088 | the regular object is larger, we must make sure that we use the |
| 1089 | larger size. This problematic case can always be avoided in C, |
| 1090 | but it must be handled correctly when using Fortran shared |
| 1091 | libraries. |
| 1092 | |
| 1093 | Note that if NEWDYNCOMMON is set, NEWDEF will be set, and |
| 1094 | likewise for OLDDYNCOMMON and OLDDEF. |
| 1095 | |
| 1096 | Note that this test is just a heuristic, and that it is quite |
| 1097 | possible to have an uninitialized symbol in a shared object which |
| 1098 | is really a definition, rather than a common symbol. This could |
| 1099 | lead to some minor confusion when the symbol really is a common |
| 1100 | symbol in some regular object. However, I think it will be |
| 1101 | harmless. */ |
| 1102 | |
| 1103 | if (newdyn |
| 1104 | && newdef |
| 1105 | && !newweak |
| 1106 | && (sec->flags & SEC_ALLOC) != 0 |
| 1107 | && (sec->flags & SEC_LOAD) == 0 |
| 1108 | && sym->st_size > 0 |
| 1109 | && ELF_ST_TYPE (sym->st_info) != STT_FUNC) |
| 1110 | newdyncommon = TRUE; |
| 1111 | else |
| 1112 | newdyncommon = FALSE; |
| 1113 | |
| 1114 | if (olddyn |
| 1115 | && olddef |
| 1116 | && h->root.type == bfd_link_hash_defined |
| 1117 | && h->def_dynamic |
| 1118 | && (h->root.u.def.section->flags & SEC_ALLOC) != 0 |
| 1119 | && (h->root.u.def.section->flags & SEC_LOAD) == 0 |
| 1120 | && h->size > 0 |
| 1121 | && h->type != STT_FUNC) |
| 1122 | olddyncommon = TRUE; |
| 1123 | else |
| 1124 | olddyncommon = FALSE; |
| 1125 | |
| 1126 | /* We now know everything about the old and new symbols. We ask the |
| 1127 | backend to check if we can merge them. */ |
| 1128 | bed = get_elf_backend_data (abfd); |
| 1129 | if (bed->merge_symbol |
| 1130 | && !bed->merge_symbol (info, sym_hash, h, sym, psec, pvalue, |
| 1131 | pold_alignment, skip, override, |
| 1132 | type_change_ok, size_change_ok, |
| 1133 | &newdyn, &newdef, &newdyncommon, &newweak, |
| 1134 | abfd, &sec, |
| 1135 | &olddyn, &olddef, &olddyncommon, &oldweak, |
| 1136 | oldbfd, &oldsec)) |
| 1137 | return FALSE; |
| 1138 | |
| 1139 | /* If both the old and the new symbols look like common symbols in a |
| 1140 | dynamic object, set the size of the symbol to the larger of the |
| 1141 | two. */ |
| 1142 | |
| 1143 | if (olddyncommon |
| 1144 | && newdyncommon |
| 1145 | && sym->st_size != h->size) |
| 1146 | { |
| 1147 | /* Since we think we have two common symbols, issue a multiple |
| 1148 | common warning if desired. Note that we only warn if the |
| 1149 | size is different. If the size is the same, we simply let |
| 1150 | the old symbol override the new one as normally happens with |
| 1151 | symbols defined in dynamic objects. */ |
| 1152 | |
| 1153 | if (! ((*info->callbacks->multiple_common) |
| 1154 | (info, h->root.root.string, oldbfd, bfd_link_hash_common, |
| 1155 | h->size, abfd, bfd_link_hash_common, sym->st_size))) |
| 1156 | return FALSE; |
| 1157 | |
| 1158 | if (sym->st_size > h->size) |
| 1159 | h->size = sym->st_size; |
| 1160 | |
| 1161 | *size_change_ok = TRUE; |
| 1162 | } |
| 1163 | |
| 1164 | /* If we are looking at a dynamic object, and we have found a |
| 1165 | definition, we need to see if the symbol was already defined by |
| 1166 | some other object. If so, we want to use the existing |
| 1167 | definition, and we do not want to report a multiple symbol |
| 1168 | definition error; we do this by clobbering *PSEC to be |
| 1169 | bfd_und_section_ptr. |
| 1170 | |
| 1171 | We treat a common symbol as a definition if the symbol in the |
| 1172 | shared library is a function, since common symbols always |
| 1173 | represent variables; this can cause confusion in principle, but |
| 1174 | any such confusion would seem to indicate an erroneous program or |
| 1175 | shared library. We also permit a common symbol in a regular |
| 1176 | object to override a weak symbol in a shared object. */ |
| 1177 | |
| 1178 | if (newdyn |
| 1179 | && newdef |
| 1180 | && (olddef |
| 1181 | || (h->root.type == bfd_link_hash_common |
| 1182 | && (newweak |
| 1183 | || ELF_ST_TYPE (sym->st_info) == STT_FUNC)))) |
| 1184 | { |
| 1185 | *override = TRUE; |
| 1186 | newdef = FALSE; |
| 1187 | newdyncommon = FALSE; |
| 1188 | |
| 1189 | *psec = sec = bfd_und_section_ptr; |
| 1190 | *size_change_ok = TRUE; |
| 1191 | |
| 1192 | /* If we get here when the old symbol is a common symbol, then |
| 1193 | we are explicitly letting it override a weak symbol or |
| 1194 | function in a dynamic object, and we don't want to warn about |
| 1195 | a type change. If the old symbol is a defined symbol, a type |
| 1196 | change warning may still be appropriate. */ |
| 1197 | |
| 1198 | if (h->root.type == bfd_link_hash_common) |
| 1199 | *type_change_ok = TRUE; |
| 1200 | } |
| 1201 | |
| 1202 | /* Handle the special case of an old common symbol merging with a |
| 1203 | new symbol which looks like a common symbol in a shared object. |
| 1204 | We change *PSEC and *PVALUE to make the new symbol look like a |
| 1205 | common symbol, and let _bfd_generic_link_add_one_symbol do the |
| 1206 | right thing. */ |
| 1207 | |
| 1208 | if (newdyncommon |
| 1209 | && h->root.type == bfd_link_hash_common) |
| 1210 | { |
| 1211 | *override = TRUE; |
| 1212 | newdef = FALSE; |
| 1213 | newdyncommon = FALSE; |
| 1214 | *pvalue = sym->st_size; |
| 1215 | *psec = sec = bed->common_section (oldsec); |
| 1216 | *size_change_ok = TRUE; |
| 1217 | } |
| 1218 | |
| 1219 | /* Skip weak definitions of symbols that are already defined. */ |
| 1220 | if (newdef && olddef && newweak) |
| 1221 | *skip = TRUE; |
| 1222 | |
| 1223 | /* If the old symbol is from a dynamic object, and the new symbol is |
| 1224 | a definition which is not from a dynamic object, then the new |
| 1225 | symbol overrides the old symbol. Symbols from regular files |
| 1226 | always take precedence over symbols from dynamic objects, even if |
| 1227 | they are defined after the dynamic object in the link. |
| 1228 | |
| 1229 | As above, we again permit a common symbol in a regular object to |
| 1230 | override a definition in a shared object if the shared object |
| 1231 | symbol is a function or is weak. */ |
| 1232 | |
| 1233 | flip = NULL; |
| 1234 | if (!newdyn |
| 1235 | && (newdef |
| 1236 | || (bfd_is_com_section (sec) |
| 1237 | && (oldweak |
| 1238 | || h->type == STT_FUNC))) |
| 1239 | && olddyn |
| 1240 | && olddef |
| 1241 | && h->def_dynamic) |
| 1242 | { |
| 1243 | /* Change the hash table entry to undefined, and let |
| 1244 | _bfd_generic_link_add_one_symbol do the right thing with the |
| 1245 | new definition. */ |
| 1246 | |
| 1247 | h->root.type = bfd_link_hash_undefined; |
| 1248 | h->root.u.undef.abfd = h->root.u.def.section->owner; |
| 1249 | *size_change_ok = TRUE; |
| 1250 | |
| 1251 | olddef = FALSE; |
| 1252 | olddyncommon = FALSE; |
| 1253 | |
| 1254 | /* We again permit a type change when a common symbol may be |
| 1255 | overriding a function. */ |
| 1256 | |
| 1257 | if (bfd_is_com_section (sec)) |
| 1258 | *type_change_ok = TRUE; |
| 1259 | |
| 1260 | if ((*sym_hash)->root.type == bfd_link_hash_indirect) |
| 1261 | flip = *sym_hash; |
| 1262 | else |
| 1263 | /* This union may have been set to be non-NULL when this symbol |
| 1264 | was seen in a dynamic object. We must force the union to be |
| 1265 | NULL, so that it is correct for a regular symbol. */ |
| 1266 | h->verinfo.vertree = NULL; |
| 1267 | } |
| 1268 | |
| 1269 | /* Handle the special case of a new common symbol merging with an |
| 1270 | old symbol that looks like it might be a common symbol defined in |
| 1271 | a shared object. Note that we have already handled the case in |
| 1272 | which a new common symbol should simply override the definition |
| 1273 | in the shared library. */ |
| 1274 | |
| 1275 | if (! newdyn |
| 1276 | && bfd_is_com_section (sec) |
| 1277 | && olddyncommon) |
| 1278 | { |
| 1279 | /* It would be best if we could set the hash table entry to a |
| 1280 | common symbol, but we don't know what to use for the section |
| 1281 | or the alignment. */ |
| 1282 | if (! ((*info->callbacks->multiple_common) |
| 1283 | (info, h->root.root.string, oldbfd, bfd_link_hash_common, |
| 1284 | h->size, abfd, bfd_link_hash_common, sym->st_size))) |
| 1285 | return FALSE; |
| 1286 | |
| 1287 | /* If the presumed common symbol in the dynamic object is |
| 1288 | larger, pretend that the new symbol has its size. */ |
| 1289 | |
| 1290 | if (h->size > *pvalue) |
| 1291 | *pvalue = h->size; |
| 1292 | |
| 1293 | /* We need to remember the alignment required by the symbol |
| 1294 | in the dynamic object. */ |
| 1295 | BFD_ASSERT (pold_alignment); |
| 1296 | *pold_alignment = h->root.u.def.section->alignment_power; |
| 1297 | |
| 1298 | olddef = FALSE; |
| 1299 | olddyncommon = FALSE; |
| 1300 | |
| 1301 | h->root.type = bfd_link_hash_undefined; |
| 1302 | h->root.u.undef.abfd = h->root.u.def.section->owner; |
| 1303 | |
| 1304 | *size_change_ok = TRUE; |
| 1305 | *type_change_ok = TRUE; |
| 1306 | |
| 1307 | if ((*sym_hash)->root.type == bfd_link_hash_indirect) |
| 1308 | flip = *sym_hash; |
| 1309 | else |
| 1310 | h->verinfo.vertree = NULL; |
| 1311 | } |
| 1312 | |
| 1313 | if (flip != NULL) |
| 1314 | { |
| 1315 | /* Handle the case where we had a versioned symbol in a dynamic |
| 1316 | library and now find a definition in a normal object. In this |
| 1317 | case, we make the versioned symbol point to the normal one. */ |
| 1318 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 1319 | flip->root.type = h->root.type; |
| 1320 | h->root.type = bfd_link_hash_indirect; |
| 1321 | h->root.u.i.link = (struct bfd_link_hash_entry *) flip; |
| 1322 | (*bed->elf_backend_copy_indirect_symbol) (info, flip, h); |
| 1323 | flip->root.u.undef.abfd = h->root.u.undef.abfd; |
| 1324 | if (h->def_dynamic) |
| 1325 | { |
| 1326 | h->def_dynamic = 0; |
| 1327 | flip->ref_dynamic = 1; |
| 1328 | } |
| 1329 | } |
| 1330 | |
| 1331 | return TRUE; |
| 1332 | } |
| 1333 | |
| 1334 | /* This function is called to create an indirect symbol from the |
| 1335 | default for the symbol with the default version if needed. The |
| 1336 | symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We |
| 1337 | set DYNSYM if the new indirect symbol is dynamic. */ |
| 1338 | |
| 1339 | bfd_boolean |
| 1340 | _bfd_elf_add_default_symbol (bfd *abfd, |
| 1341 | struct bfd_link_info *info, |
| 1342 | struct elf_link_hash_entry *h, |
| 1343 | const char *name, |
| 1344 | Elf_Internal_Sym *sym, |
| 1345 | asection **psec, |
| 1346 | bfd_vma *value, |
| 1347 | bfd_boolean *dynsym, |
| 1348 | bfd_boolean override) |
| 1349 | { |
| 1350 | bfd_boolean type_change_ok; |
| 1351 | bfd_boolean size_change_ok; |
| 1352 | bfd_boolean skip; |
| 1353 | char *shortname; |
| 1354 | struct elf_link_hash_entry *hi; |
| 1355 | struct bfd_link_hash_entry *bh; |
| 1356 | const struct elf_backend_data *bed; |
| 1357 | bfd_boolean collect; |
| 1358 | bfd_boolean dynamic; |
| 1359 | char *p; |
| 1360 | size_t len, shortlen; |
| 1361 | asection *sec; |
| 1362 | |
| 1363 | /* If this symbol has a version, and it is the default version, we |
| 1364 | create an indirect symbol from the default name to the fully |
| 1365 | decorated name. This will cause external references which do not |
| 1366 | specify a version to be bound to this version of the symbol. */ |
| 1367 | p = strchr (name, ELF_VER_CHR); |
| 1368 | if (p == NULL || p[1] != ELF_VER_CHR) |
| 1369 | return TRUE; |
| 1370 | |
| 1371 | if (override) |
| 1372 | { |
| 1373 | /* We are overridden by an old definition. We need to check if we |
| 1374 | need to create the indirect symbol from the default name. */ |
| 1375 | hi = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, |
| 1376 | FALSE, FALSE); |
| 1377 | BFD_ASSERT (hi != NULL); |
| 1378 | if (hi == h) |
| 1379 | return TRUE; |
| 1380 | while (hi->root.type == bfd_link_hash_indirect |
| 1381 | || hi->root.type == bfd_link_hash_warning) |
| 1382 | { |
| 1383 | hi = (struct elf_link_hash_entry *) hi->root.u.i.link; |
| 1384 | if (hi == h) |
| 1385 | return TRUE; |
| 1386 | } |
| 1387 | } |
| 1388 | |
| 1389 | bed = get_elf_backend_data (abfd); |
| 1390 | collect = bed->collect; |
| 1391 | dynamic = (abfd->flags & DYNAMIC) != 0; |
| 1392 | |
| 1393 | shortlen = p - name; |
| 1394 | shortname = bfd_hash_allocate (&info->hash->table, shortlen + 1); |
| 1395 | if (shortname == NULL) |
| 1396 | return FALSE; |
| 1397 | memcpy (shortname, name, shortlen); |
| 1398 | shortname[shortlen] = '\0'; |
| 1399 | |
| 1400 | /* We are going to create a new symbol. Merge it with any existing |
| 1401 | symbol with this name. For the purposes of the merge, act as |
| 1402 | though we were defining the symbol we just defined, although we |
| 1403 | actually going to define an indirect symbol. */ |
| 1404 | type_change_ok = FALSE; |
| 1405 | size_change_ok = FALSE; |
| 1406 | sec = *psec; |
| 1407 | if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value, |
| 1408 | NULL, &hi, &skip, &override, |
| 1409 | &type_change_ok, &size_change_ok)) |
| 1410 | return FALSE; |
| 1411 | |
| 1412 | if (skip) |
| 1413 | goto nondefault; |
| 1414 | |
| 1415 | if (! override) |
| 1416 | { |
| 1417 | bh = &hi->root; |
| 1418 | if (! (_bfd_generic_link_add_one_symbol |
| 1419 | (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr, |
| 1420 | 0, name, FALSE, collect, &bh))) |
| 1421 | return FALSE; |
| 1422 | hi = (struct elf_link_hash_entry *) bh; |
| 1423 | } |
| 1424 | else |
| 1425 | { |
| 1426 | /* In this case the symbol named SHORTNAME is overriding the |
| 1427 | indirect symbol we want to add. We were planning on making |
| 1428 | SHORTNAME an indirect symbol referring to NAME. SHORTNAME |
| 1429 | is the name without a version. NAME is the fully versioned |
| 1430 | name, and it is the default version. |
| 1431 | |
| 1432 | Overriding means that we already saw a definition for the |
| 1433 | symbol SHORTNAME in a regular object, and it is overriding |
| 1434 | the symbol defined in the dynamic object. |
| 1435 | |
| 1436 | When this happens, we actually want to change NAME, the |
| 1437 | symbol we just added, to refer to SHORTNAME. This will cause |
| 1438 | references to NAME in the shared object to become references |
| 1439 | to SHORTNAME in the regular object. This is what we expect |
| 1440 | when we override a function in a shared object: that the |
| 1441 | references in the shared object will be mapped to the |
| 1442 | definition in the regular object. */ |
| 1443 | |
| 1444 | while (hi->root.type == bfd_link_hash_indirect |
| 1445 | || hi->root.type == bfd_link_hash_warning) |
| 1446 | hi = (struct elf_link_hash_entry *) hi->root.u.i.link; |
| 1447 | |
| 1448 | h->root.type = bfd_link_hash_indirect; |
| 1449 | h->root.u.i.link = (struct bfd_link_hash_entry *) hi; |
| 1450 | if (h->def_dynamic) |
| 1451 | { |
| 1452 | h->def_dynamic = 0; |
| 1453 | hi->ref_dynamic = 1; |
| 1454 | if (hi->ref_regular |
| 1455 | || hi->def_regular) |
| 1456 | { |
| 1457 | if (! bfd_elf_link_record_dynamic_symbol (info, hi)) |
| 1458 | return FALSE; |
| 1459 | } |
| 1460 | } |
| 1461 | |
| 1462 | /* Now set HI to H, so that the following code will set the |
| 1463 | other fields correctly. */ |
| 1464 | hi = h; |
| 1465 | } |
| 1466 | |
| 1467 | /* If there is a duplicate definition somewhere, then HI may not |
| 1468 | point to an indirect symbol. We will have reported an error to |
| 1469 | the user in that case. */ |
| 1470 | |
| 1471 | if (hi->root.type == bfd_link_hash_indirect) |
| 1472 | { |
| 1473 | struct elf_link_hash_entry *ht; |
| 1474 | |
| 1475 | ht = (struct elf_link_hash_entry *) hi->root.u.i.link; |
| 1476 | (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi); |
| 1477 | |
| 1478 | /* See if the new flags lead us to realize that the symbol must |
| 1479 | be dynamic. */ |
| 1480 | if (! *dynsym) |
| 1481 | { |
| 1482 | if (! dynamic) |
| 1483 | { |
| 1484 | if (info->shared |
| 1485 | || hi->ref_dynamic) |
| 1486 | *dynsym = TRUE; |
| 1487 | } |
| 1488 | else |
| 1489 | { |
| 1490 | if (hi->ref_regular) |
| 1491 | *dynsym = TRUE; |
| 1492 | } |
| 1493 | } |
| 1494 | } |
| 1495 | |
| 1496 | /* We also need to define an indirection from the nondefault version |
| 1497 | of the symbol. */ |
| 1498 | |
| 1499 | nondefault: |
| 1500 | len = strlen (name); |
| 1501 | shortname = bfd_hash_allocate (&info->hash->table, len); |
| 1502 | if (shortname == NULL) |
| 1503 | return FALSE; |
| 1504 | memcpy (shortname, name, shortlen); |
| 1505 | memcpy (shortname + shortlen, p + 1, len - shortlen); |
| 1506 | |
| 1507 | /* Once again, merge with any existing symbol. */ |
| 1508 | type_change_ok = FALSE; |
| 1509 | size_change_ok = FALSE; |
| 1510 | sec = *psec; |
| 1511 | if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value, |
| 1512 | NULL, &hi, &skip, &override, |
| 1513 | &type_change_ok, &size_change_ok)) |
| 1514 | return FALSE; |
| 1515 | |
| 1516 | if (skip) |
| 1517 | return TRUE; |
| 1518 | |
| 1519 | if (override) |
| 1520 | { |
| 1521 | /* Here SHORTNAME is a versioned name, so we don't expect to see |
| 1522 | the type of override we do in the case above unless it is |
| 1523 | overridden by a versioned definition. */ |
| 1524 | if (hi->root.type != bfd_link_hash_defined |
| 1525 | && hi->root.type != bfd_link_hash_defweak) |
| 1526 | (*_bfd_error_handler) |
| 1527 | (_("%B: unexpected redefinition of indirect versioned symbol `%s'"), |
| 1528 | abfd, shortname); |
| 1529 | } |
| 1530 | else |
| 1531 | { |
| 1532 | bh = &hi->root; |
| 1533 | if (! (_bfd_generic_link_add_one_symbol |
| 1534 | (info, abfd, shortname, BSF_INDIRECT, |
| 1535 | bfd_ind_section_ptr, 0, name, FALSE, collect, &bh))) |
| 1536 | return FALSE; |
| 1537 | hi = (struct elf_link_hash_entry *) bh; |
| 1538 | |
| 1539 | /* If there is a duplicate definition somewhere, then HI may not |
| 1540 | point to an indirect symbol. We will have reported an error |
| 1541 | to the user in that case. */ |
| 1542 | |
| 1543 | if (hi->root.type == bfd_link_hash_indirect) |
| 1544 | { |
| 1545 | (*bed->elf_backend_copy_indirect_symbol) (info, h, hi); |
| 1546 | |
| 1547 | /* See if the new flags lead us to realize that the symbol |
| 1548 | must be dynamic. */ |
| 1549 | if (! *dynsym) |
| 1550 | { |
| 1551 | if (! dynamic) |
| 1552 | { |
| 1553 | if (info->shared |
| 1554 | || hi->ref_dynamic) |
| 1555 | *dynsym = TRUE; |
| 1556 | } |
| 1557 | else |
| 1558 | { |
| 1559 | if (hi->ref_regular) |
| 1560 | *dynsym = TRUE; |
| 1561 | } |
| 1562 | } |
| 1563 | } |
| 1564 | } |
| 1565 | |
| 1566 | return TRUE; |
| 1567 | } |
| 1568 | \f |
| 1569 | /* This routine is used to export all defined symbols into the dynamic |
| 1570 | symbol table. It is called via elf_link_hash_traverse. */ |
| 1571 | |
| 1572 | bfd_boolean |
| 1573 | _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data) |
| 1574 | { |
| 1575 | struct elf_info_failed *eif = data; |
| 1576 | |
| 1577 | /* Ignore indirect symbols. These are added by the versioning code. */ |
| 1578 | if (h->root.type == bfd_link_hash_indirect) |
| 1579 | return TRUE; |
| 1580 | |
| 1581 | if (h->root.type == bfd_link_hash_warning) |
| 1582 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1583 | |
| 1584 | if (h->dynindx == -1 |
| 1585 | && (h->def_regular |
| 1586 | || h->ref_regular)) |
| 1587 | { |
| 1588 | struct bfd_elf_version_tree *t; |
| 1589 | struct bfd_elf_version_expr *d; |
| 1590 | |
| 1591 | for (t = eif->verdefs; t != NULL; t = t->next) |
| 1592 | { |
| 1593 | if (t->globals.list != NULL) |
| 1594 | { |
| 1595 | d = (*t->match) (&t->globals, NULL, h->root.root.string); |
| 1596 | if (d != NULL) |
| 1597 | goto doit; |
| 1598 | } |
| 1599 | |
| 1600 | if (t->locals.list != NULL) |
| 1601 | { |
| 1602 | d = (*t->match) (&t->locals, NULL, h->root.root.string); |
| 1603 | if (d != NULL) |
| 1604 | return TRUE; |
| 1605 | } |
| 1606 | } |
| 1607 | |
| 1608 | if (!eif->verdefs) |
| 1609 | { |
| 1610 | doit: |
| 1611 | if (! bfd_elf_link_record_dynamic_symbol (eif->info, h)) |
| 1612 | { |
| 1613 | eif->failed = TRUE; |
| 1614 | return FALSE; |
| 1615 | } |
| 1616 | } |
| 1617 | } |
| 1618 | |
| 1619 | return TRUE; |
| 1620 | } |
| 1621 | \f |
| 1622 | /* Look through the symbols which are defined in other shared |
| 1623 | libraries and referenced here. Update the list of version |
| 1624 | dependencies. This will be put into the .gnu.version_r section. |
| 1625 | This function is called via elf_link_hash_traverse. */ |
| 1626 | |
| 1627 | bfd_boolean |
| 1628 | _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h, |
| 1629 | void *data) |
| 1630 | { |
| 1631 | struct elf_find_verdep_info *rinfo = data; |
| 1632 | Elf_Internal_Verneed *t; |
| 1633 | Elf_Internal_Vernaux *a; |
| 1634 | bfd_size_type amt; |
| 1635 | |
| 1636 | if (h->root.type == bfd_link_hash_warning) |
| 1637 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1638 | |
| 1639 | /* We only care about symbols defined in shared objects with version |
| 1640 | information. */ |
| 1641 | if (!h->def_dynamic |
| 1642 | || h->def_regular |
| 1643 | || h->dynindx == -1 |
| 1644 | || h->verinfo.verdef == NULL) |
| 1645 | return TRUE; |
| 1646 | |
| 1647 | /* See if we already know about this version. */ |
| 1648 | for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref) |
| 1649 | { |
| 1650 | if (t->vn_bfd != h->verinfo.verdef->vd_bfd) |
| 1651 | continue; |
| 1652 | |
| 1653 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 1654 | if (a->vna_nodename == h->verinfo.verdef->vd_nodename) |
| 1655 | return TRUE; |
| 1656 | |
| 1657 | break; |
| 1658 | } |
| 1659 | |
| 1660 | /* This is a new version. Add it to tree we are building. */ |
| 1661 | |
| 1662 | if (t == NULL) |
| 1663 | { |
| 1664 | amt = sizeof *t; |
| 1665 | t = bfd_zalloc (rinfo->output_bfd, amt); |
| 1666 | if (t == NULL) |
| 1667 | { |
| 1668 | rinfo->failed = TRUE; |
| 1669 | return FALSE; |
| 1670 | } |
| 1671 | |
| 1672 | t->vn_bfd = h->verinfo.verdef->vd_bfd; |
| 1673 | t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref; |
| 1674 | elf_tdata (rinfo->output_bfd)->verref = t; |
| 1675 | } |
| 1676 | |
| 1677 | amt = sizeof *a; |
| 1678 | a = bfd_zalloc (rinfo->output_bfd, amt); |
| 1679 | |
| 1680 | /* Note that we are copying a string pointer here, and testing it |
| 1681 | above. If bfd_elf_string_from_elf_section is ever changed to |
| 1682 | discard the string data when low in memory, this will have to be |
| 1683 | fixed. */ |
| 1684 | a->vna_nodename = h->verinfo.verdef->vd_nodename; |
| 1685 | |
| 1686 | a->vna_flags = h->verinfo.verdef->vd_flags; |
| 1687 | a->vna_nextptr = t->vn_auxptr; |
| 1688 | |
| 1689 | h->verinfo.verdef->vd_exp_refno = rinfo->vers; |
| 1690 | ++rinfo->vers; |
| 1691 | |
| 1692 | a->vna_other = h->verinfo.verdef->vd_exp_refno + 1; |
| 1693 | |
| 1694 | t->vn_auxptr = a; |
| 1695 | |
| 1696 | return TRUE; |
| 1697 | } |
| 1698 | |
| 1699 | /* Figure out appropriate versions for all the symbols. We may not |
| 1700 | have the version number script until we have read all of the input |
| 1701 | files, so until that point we don't know which symbols should be |
| 1702 | local. This function is called via elf_link_hash_traverse. */ |
| 1703 | |
| 1704 | bfd_boolean |
| 1705 | _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data) |
| 1706 | { |
| 1707 | struct elf_assign_sym_version_info *sinfo; |
| 1708 | struct bfd_link_info *info; |
| 1709 | const struct elf_backend_data *bed; |
| 1710 | struct elf_info_failed eif; |
| 1711 | char *p; |
| 1712 | bfd_size_type amt; |
| 1713 | |
| 1714 | sinfo = data; |
| 1715 | info = sinfo->info; |
| 1716 | |
| 1717 | if (h->root.type == bfd_link_hash_warning) |
| 1718 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1719 | |
| 1720 | /* Fix the symbol flags. */ |
| 1721 | eif.failed = FALSE; |
| 1722 | eif.info = info; |
| 1723 | if (! _bfd_elf_fix_symbol_flags (h, &eif)) |
| 1724 | { |
| 1725 | if (eif.failed) |
| 1726 | sinfo->failed = TRUE; |
| 1727 | return FALSE; |
| 1728 | } |
| 1729 | |
| 1730 | /* We only need version numbers for symbols defined in regular |
| 1731 | objects. */ |
| 1732 | if (!h->def_regular) |
| 1733 | return TRUE; |
| 1734 | |
| 1735 | bed = get_elf_backend_data (sinfo->output_bfd); |
| 1736 | p = strchr (h->root.root.string, ELF_VER_CHR); |
| 1737 | if (p != NULL && h->verinfo.vertree == NULL) |
| 1738 | { |
| 1739 | struct bfd_elf_version_tree *t; |
| 1740 | bfd_boolean hidden; |
| 1741 | |
| 1742 | hidden = TRUE; |
| 1743 | |
| 1744 | /* There are two consecutive ELF_VER_CHR characters if this is |
| 1745 | not a hidden symbol. */ |
| 1746 | ++p; |
| 1747 | if (*p == ELF_VER_CHR) |
| 1748 | { |
| 1749 | hidden = FALSE; |
| 1750 | ++p; |
| 1751 | } |
| 1752 | |
| 1753 | /* If there is no version string, we can just return out. */ |
| 1754 | if (*p == '\0') |
| 1755 | { |
| 1756 | if (hidden) |
| 1757 | h->hidden = 1; |
| 1758 | return TRUE; |
| 1759 | } |
| 1760 | |
| 1761 | /* Look for the version. If we find it, it is no longer weak. */ |
| 1762 | for (t = sinfo->verdefs; t != NULL; t = t->next) |
| 1763 | { |
| 1764 | if (strcmp (t->name, p) == 0) |
| 1765 | { |
| 1766 | size_t len; |
| 1767 | char *alc; |
| 1768 | struct bfd_elf_version_expr *d; |
| 1769 | |
| 1770 | len = p - h->root.root.string; |
| 1771 | alc = bfd_malloc (len); |
| 1772 | if (alc == NULL) |
| 1773 | return FALSE; |
| 1774 | memcpy (alc, h->root.root.string, len - 1); |
| 1775 | alc[len - 1] = '\0'; |
| 1776 | if (alc[len - 2] == ELF_VER_CHR) |
| 1777 | alc[len - 2] = '\0'; |
| 1778 | |
| 1779 | h->verinfo.vertree = t; |
| 1780 | t->used = TRUE; |
| 1781 | d = NULL; |
| 1782 | |
| 1783 | if (t->globals.list != NULL) |
| 1784 | d = (*t->match) (&t->globals, NULL, alc); |
| 1785 | |
| 1786 | /* See if there is anything to force this symbol to |
| 1787 | local scope. */ |
| 1788 | if (d == NULL && t->locals.list != NULL) |
| 1789 | { |
| 1790 | d = (*t->match) (&t->locals, NULL, alc); |
| 1791 | if (d != NULL |
| 1792 | && h->dynindx != -1 |
| 1793 | && ! info->export_dynamic) |
| 1794 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 1795 | } |
| 1796 | |
| 1797 | free (alc); |
| 1798 | break; |
| 1799 | } |
| 1800 | } |
| 1801 | |
| 1802 | /* If we are building an application, we need to create a |
| 1803 | version node for this version. */ |
| 1804 | if (t == NULL && info->executable) |
| 1805 | { |
| 1806 | struct bfd_elf_version_tree **pp; |
| 1807 | int version_index; |
| 1808 | |
| 1809 | /* If we aren't going to export this symbol, we don't need |
| 1810 | to worry about it. */ |
| 1811 | if (h->dynindx == -1) |
| 1812 | return TRUE; |
| 1813 | |
| 1814 | amt = sizeof *t; |
| 1815 | t = bfd_zalloc (sinfo->output_bfd, amt); |
| 1816 | if (t == NULL) |
| 1817 | { |
| 1818 | sinfo->failed = TRUE; |
| 1819 | return FALSE; |
| 1820 | } |
| 1821 | |
| 1822 | t->name = p; |
| 1823 | t->name_indx = (unsigned int) -1; |
| 1824 | t->used = TRUE; |
| 1825 | |
| 1826 | version_index = 1; |
| 1827 | /* Don't count anonymous version tag. */ |
| 1828 | if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0) |
| 1829 | version_index = 0; |
| 1830 | for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next) |
| 1831 | ++version_index; |
| 1832 | t->vernum = version_index; |
| 1833 | |
| 1834 | *pp = t; |
| 1835 | |
| 1836 | h->verinfo.vertree = t; |
| 1837 | } |
| 1838 | else if (t == NULL) |
| 1839 | { |
| 1840 | /* We could not find the version for a symbol when |
| 1841 | generating a shared archive. Return an error. */ |
| 1842 | (*_bfd_error_handler) |
| 1843 | (_("%B: undefined versioned symbol name %s"), |
| 1844 | sinfo->output_bfd, h->root.root.string); |
| 1845 | bfd_set_error (bfd_error_bad_value); |
| 1846 | sinfo->failed = TRUE; |
| 1847 | return FALSE; |
| 1848 | } |
| 1849 | |
| 1850 | if (hidden) |
| 1851 | h->hidden = 1; |
| 1852 | } |
| 1853 | |
| 1854 | /* If we don't have a version for this symbol, see if we can find |
| 1855 | something. */ |
| 1856 | if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL) |
| 1857 | { |
| 1858 | struct bfd_elf_version_tree *t; |
| 1859 | struct bfd_elf_version_tree *local_ver; |
| 1860 | struct bfd_elf_version_expr *d; |
| 1861 | |
| 1862 | /* See if can find what version this symbol is in. If the |
| 1863 | symbol is supposed to be local, then don't actually register |
| 1864 | it. */ |
| 1865 | local_ver = NULL; |
| 1866 | for (t = sinfo->verdefs; t != NULL; t = t->next) |
| 1867 | { |
| 1868 | if (t->globals.list != NULL) |
| 1869 | { |
| 1870 | bfd_boolean matched; |
| 1871 | |
| 1872 | matched = FALSE; |
| 1873 | d = NULL; |
| 1874 | while ((d = (*t->match) (&t->globals, d, |
| 1875 | h->root.root.string)) != NULL) |
| 1876 | if (d->symver) |
| 1877 | matched = TRUE; |
| 1878 | else |
| 1879 | { |
| 1880 | /* There is a version without definition. Make |
| 1881 | the symbol the default definition for this |
| 1882 | version. */ |
| 1883 | h->verinfo.vertree = t; |
| 1884 | local_ver = NULL; |
| 1885 | d->script = 1; |
| 1886 | break; |
| 1887 | } |
| 1888 | if (d != NULL) |
| 1889 | break; |
| 1890 | else if (matched) |
| 1891 | /* There is no undefined version for this symbol. Hide the |
| 1892 | default one. */ |
| 1893 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 1894 | } |
| 1895 | |
| 1896 | if (t->locals.list != NULL) |
| 1897 | { |
| 1898 | d = NULL; |
| 1899 | while ((d = (*t->match) (&t->locals, d, |
| 1900 | h->root.root.string)) != NULL) |
| 1901 | { |
| 1902 | local_ver = t; |
| 1903 | /* If the match is "*", keep looking for a more |
| 1904 | explicit, perhaps even global, match. |
| 1905 | XXX: Shouldn't this be !d->wildcard instead? */ |
| 1906 | if (d->pattern[0] != '*' || d->pattern[1] != '\0') |
| 1907 | break; |
| 1908 | } |
| 1909 | |
| 1910 | if (d != NULL) |
| 1911 | break; |
| 1912 | } |
| 1913 | } |
| 1914 | |
| 1915 | if (local_ver != NULL) |
| 1916 | { |
| 1917 | h->verinfo.vertree = local_ver; |
| 1918 | if (h->dynindx != -1 |
| 1919 | && ! info->export_dynamic) |
| 1920 | { |
| 1921 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 1922 | } |
| 1923 | } |
| 1924 | } |
| 1925 | |
| 1926 | return TRUE; |
| 1927 | } |
| 1928 | \f |
| 1929 | /* Read and swap the relocs from the section indicated by SHDR. This |
| 1930 | may be either a REL or a RELA section. The relocations are |
| 1931 | translated into RELA relocations and stored in INTERNAL_RELOCS, |
| 1932 | which should have already been allocated to contain enough space. |
| 1933 | The EXTERNAL_RELOCS are a buffer where the external form of the |
| 1934 | relocations should be stored. |
| 1935 | |
| 1936 | Returns FALSE if something goes wrong. */ |
| 1937 | |
| 1938 | static bfd_boolean |
| 1939 | elf_link_read_relocs_from_section (bfd *abfd, |
| 1940 | asection *sec, |
| 1941 | Elf_Internal_Shdr *shdr, |
| 1942 | void *external_relocs, |
| 1943 | Elf_Internal_Rela *internal_relocs) |
| 1944 | { |
| 1945 | const struct elf_backend_data *bed; |
| 1946 | void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *); |
| 1947 | const bfd_byte *erela; |
| 1948 | const bfd_byte *erelaend; |
| 1949 | Elf_Internal_Rela *irela; |
| 1950 | Elf_Internal_Shdr *symtab_hdr; |
| 1951 | size_t nsyms; |
| 1952 | |
| 1953 | /* Position ourselves at the start of the section. */ |
| 1954 | if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0) |
| 1955 | return FALSE; |
| 1956 | |
| 1957 | /* Read the relocations. */ |
| 1958 | if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size) |
| 1959 | return FALSE; |
| 1960 | |
| 1961 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1962 | nsyms = symtab_hdr->sh_size / symtab_hdr->sh_entsize; |
| 1963 | |
| 1964 | bed = get_elf_backend_data (abfd); |
| 1965 | |
| 1966 | /* Convert the external relocations to the internal format. */ |
| 1967 | if (shdr->sh_entsize == bed->s->sizeof_rel) |
| 1968 | swap_in = bed->s->swap_reloc_in; |
| 1969 | else if (shdr->sh_entsize == bed->s->sizeof_rela) |
| 1970 | swap_in = bed->s->swap_reloca_in; |
| 1971 | else |
| 1972 | { |
| 1973 | bfd_set_error (bfd_error_wrong_format); |
| 1974 | return FALSE; |
| 1975 | } |
| 1976 | |
| 1977 | erela = external_relocs; |
| 1978 | erelaend = erela + shdr->sh_size; |
| 1979 | irela = internal_relocs; |
| 1980 | while (erela < erelaend) |
| 1981 | { |
| 1982 | bfd_vma r_symndx; |
| 1983 | |
| 1984 | (*swap_in) (abfd, erela, irela); |
| 1985 | r_symndx = ELF32_R_SYM (irela->r_info); |
| 1986 | if (bed->s->arch_size == 64) |
| 1987 | r_symndx >>= 24; |
| 1988 | if ((size_t) r_symndx >= nsyms) |
| 1989 | { |
| 1990 | (*_bfd_error_handler) |
| 1991 | (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)" |
| 1992 | " for offset 0x%lx in section `%A'"), |
| 1993 | abfd, sec, |
| 1994 | (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset); |
| 1995 | bfd_set_error (bfd_error_bad_value); |
| 1996 | return FALSE; |
| 1997 | } |
| 1998 | irela += bed->s->int_rels_per_ext_rel; |
| 1999 | erela += shdr->sh_entsize; |
| 2000 | } |
| 2001 | |
| 2002 | return TRUE; |
| 2003 | } |
| 2004 | |
| 2005 | /* Read and swap the relocs for a section O. They may have been |
| 2006 | cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are |
| 2007 | not NULL, they are used as buffers to read into. They are known to |
| 2008 | be large enough. If the INTERNAL_RELOCS relocs argument is NULL, |
| 2009 | the return value is allocated using either malloc or bfd_alloc, |
| 2010 | according to the KEEP_MEMORY argument. If O has two relocation |
| 2011 | sections (both REL and RELA relocations), then the REL_HDR |
| 2012 | relocations will appear first in INTERNAL_RELOCS, followed by the |
| 2013 | REL_HDR2 relocations. */ |
| 2014 | |
| 2015 | Elf_Internal_Rela * |
| 2016 | _bfd_elf_link_read_relocs (bfd *abfd, |
| 2017 | asection *o, |
| 2018 | void *external_relocs, |
| 2019 | Elf_Internal_Rela *internal_relocs, |
| 2020 | bfd_boolean keep_memory) |
| 2021 | { |
| 2022 | Elf_Internal_Shdr *rel_hdr; |
| 2023 | void *alloc1 = NULL; |
| 2024 | Elf_Internal_Rela *alloc2 = NULL; |
| 2025 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 2026 | |
| 2027 | if (elf_section_data (o)->relocs != NULL) |
| 2028 | return elf_section_data (o)->relocs; |
| 2029 | |
| 2030 | if (o->reloc_count == 0) |
| 2031 | return NULL; |
| 2032 | |
| 2033 | rel_hdr = &elf_section_data (o)->rel_hdr; |
| 2034 | |
| 2035 | if (internal_relocs == NULL) |
| 2036 | { |
| 2037 | bfd_size_type size; |
| 2038 | |
| 2039 | size = o->reloc_count; |
| 2040 | size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela); |
| 2041 | if (keep_memory) |
| 2042 | internal_relocs = bfd_alloc (abfd, size); |
| 2043 | else |
| 2044 | internal_relocs = alloc2 = bfd_malloc (size); |
| 2045 | if (internal_relocs == NULL) |
| 2046 | goto error_return; |
| 2047 | } |
| 2048 | |
| 2049 | if (external_relocs == NULL) |
| 2050 | { |
| 2051 | bfd_size_type size = rel_hdr->sh_size; |
| 2052 | |
| 2053 | if (elf_section_data (o)->rel_hdr2) |
| 2054 | size += elf_section_data (o)->rel_hdr2->sh_size; |
| 2055 | alloc1 = bfd_malloc (size); |
| 2056 | if (alloc1 == NULL) |
| 2057 | goto error_return; |
| 2058 | external_relocs = alloc1; |
| 2059 | } |
| 2060 | |
| 2061 | if (!elf_link_read_relocs_from_section (abfd, o, rel_hdr, |
| 2062 | external_relocs, |
| 2063 | internal_relocs)) |
| 2064 | goto error_return; |
| 2065 | if (elf_section_data (o)->rel_hdr2 |
| 2066 | && (!elf_link_read_relocs_from_section |
| 2067 | (abfd, o, |
| 2068 | elf_section_data (o)->rel_hdr2, |
| 2069 | ((bfd_byte *) external_relocs) + rel_hdr->sh_size, |
| 2070 | internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr) |
| 2071 | * bed->s->int_rels_per_ext_rel)))) |
| 2072 | goto error_return; |
| 2073 | |
| 2074 | /* Cache the results for next time, if we can. */ |
| 2075 | if (keep_memory) |
| 2076 | elf_section_data (o)->relocs = internal_relocs; |
| 2077 | |
| 2078 | if (alloc1 != NULL) |
| 2079 | free (alloc1); |
| 2080 | |
| 2081 | /* Don't free alloc2, since if it was allocated we are passing it |
| 2082 | back (under the name of internal_relocs). */ |
| 2083 | |
| 2084 | return internal_relocs; |
| 2085 | |
| 2086 | error_return: |
| 2087 | if (alloc1 != NULL) |
| 2088 | free (alloc1); |
| 2089 | if (alloc2 != NULL) |
| 2090 | free (alloc2); |
| 2091 | return NULL; |
| 2092 | } |
| 2093 | |
| 2094 | /* Compute the size of, and allocate space for, REL_HDR which is the |
| 2095 | section header for a section containing relocations for O. */ |
| 2096 | |
| 2097 | bfd_boolean |
| 2098 | _bfd_elf_link_size_reloc_section (bfd *abfd, |
| 2099 | Elf_Internal_Shdr *rel_hdr, |
| 2100 | asection *o) |
| 2101 | { |
| 2102 | bfd_size_type reloc_count; |
| 2103 | bfd_size_type num_rel_hashes; |
| 2104 | |
| 2105 | /* Figure out how many relocations there will be. */ |
| 2106 | if (rel_hdr == &elf_section_data (o)->rel_hdr) |
| 2107 | reloc_count = elf_section_data (o)->rel_count; |
| 2108 | else |
| 2109 | reloc_count = elf_section_data (o)->rel_count2; |
| 2110 | |
| 2111 | num_rel_hashes = o->reloc_count; |
| 2112 | if (num_rel_hashes < reloc_count) |
| 2113 | num_rel_hashes = reloc_count; |
| 2114 | |
| 2115 | /* That allows us to calculate the size of the section. */ |
| 2116 | rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count; |
| 2117 | |
| 2118 | /* The contents field must last into write_object_contents, so we |
| 2119 | allocate it with bfd_alloc rather than malloc. Also since we |
| 2120 | cannot be sure that the contents will actually be filled in, |
| 2121 | we zero the allocated space. */ |
| 2122 | rel_hdr->contents = bfd_zalloc (abfd, rel_hdr->sh_size); |
| 2123 | if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0) |
| 2124 | return FALSE; |
| 2125 | |
| 2126 | /* We only allocate one set of hash entries, so we only do it the |
| 2127 | first time we are called. */ |
| 2128 | if (elf_section_data (o)->rel_hashes == NULL |
| 2129 | && num_rel_hashes) |
| 2130 | { |
| 2131 | struct elf_link_hash_entry **p; |
| 2132 | |
| 2133 | p = bfd_zmalloc (num_rel_hashes * sizeof (struct elf_link_hash_entry *)); |
| 2134 | if (p == NULL) |
| 2135 | return FALSE; |
| 2136 | |
| 2137 | elf_section_data (o)->rel_hashes = p; |
| 2138 | } |
| 2139 | |
| 2140 | return TRUE; |
| 2141 | } |
| 2142 | |
| 2143 | /* Copy the relocations indicated by the INTERNAL_RELOCS (which |
| 2144 | originated from the section given by INPUT_REL_HDR) to the |
| 2145 | OUTPUT_BFD. */ |
| 2146 | |
| 2147 | bfd_boolean |
| 2148 | _bfd_elf_link_output_relocs (bfd *output_bfd, |
| 2149 | asection *input_section, |
| 2150 | Elf_Internal_Shdr *input_rel_hdr, |
| 2151 | Elf_Internal_Rela *internal_relocs, |
| 2152 | struct elf_link_hash_entry **rel_hash |
| 2153 | ATTRIBUTE_UNUSED) |
| 2154 | { |
| 2155 | Elf_Internal_Rela *irela; |
| 2156 | Elf_Internal_Rela *irelaend; |
| 2157 | bfd_byte *erel; |
| 2158 | Elf_Internal_Shdr *output_rel_hdr; |
| 2159 | asection *output_section; |
| 2160 | unsigned int *rel_countp = NULL; |
| 2161 | const struct elf_backend_data *bed; |
| 2162 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
| 2163 | |
| 2164 | output_section = input_section->output_section; |
| 2165 | output_rel_hdr = NULL; |
| 2166 | |
| 2167 | if (elf_section_data (output_section)->rel_hdr.sh_entsize |
| 2168 | == input_rel_hdr->sh_entsize) |
| 2169 | { |
| 2170 | output_rel_hdr = &elf_section_data (output_section)->rel_hdr; |
| 2171 | rel_countp = &elf_section_data (output_section)->rel_count; |
| 2172 | } |
| 2173 | else if (elf_section_data (output_section)->rel_hdr2 |
| 2174 | && (elf_section_data (output_section)->rel_hdr2->sh_entsize |
| 2175 | == input_rel_hdr->sh_entsize)) |
| 2176 | { |
| 2177 | output_rel_hdr = elf_section_data (output_section)->rel_hdr2; |
| 2178 | rel_countp = &elf_section_data (output_section)->rel_count2; |
| 2179 | } |
| 2180 | else |
| 2181 | { |
| 2182 | (*_bfd_error_handler) |
| 2183 | (_("%B: relocation size mismatch in %B section %A"), |
| 2184 | output_bfd, input_section->owner, input_section); |
| 2185 | bfd_set_error (bfd_error_wrong_object_format); |
| 2186 | return FALSE; |
| 2187 | } |
| 2188 | |
| 2189 | bed = get_elf_backend_data (output_bfd); |
| 2190 | if (input_rel_hdr->sh_entsize == bed->s->sizeof_rel) |
| 2191 | swap_out = bed->s->swap_reloc_out; |
| 2192 | else if (input_rel_hdr->sh_entsize == bed->s->sizeof_rela) |
| 2193 | swap_out = bed->s->swap_reloca_out; |
| 2194 | else |
| 2195 | abort (); |
| 2196 | |
| 2197 | erel = output_rel_hdr->contents; |
| 2198 | erel += *rel_countp * input_rel_hdr->sh_entsize; |
| 2199 | irela = internal_relocs; |
| 2200 | irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr) |
| 2201 | * bed->s->int_rels_per_ext_rel); |
| 2202 | while (irela < irelaend) |
| 2203 | { |
| 2204 | (*swap_out) (output_bfd, irela, erel); |
| 2205 | irela += bed->s->int_rels_per_ext_rel; |
| 2206 | erel += input_rel_hdr->sh_entsize; |
| 2207 | } |
| 2208 | |
| 2209 | /* Bump the counter, so that we know where to add the next set of |
| 2210 | relocations. */ |
| 2211 | *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr); |
| 2212 | |
| 2213 | return TRUE; |
| 2214 | } |
| 2215 | \f |
| 2216 | /* Make weak undefined symbols in PIE dynamic. */ |
| 2217 | |
| 2218 | bfd_boolean |
| 2219 | _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info, |
| 2220 | struct elf_link_hash_entry *h) |
| 2221 | { |
| 2222 | if (info->pie |
| 2223 | && h->dynindx == -1 |
| 2224 | && h->root.type == bfd_link_hash_undefweak) |
| 2225 | return bfd_elf_link_record_dynamic_symbol (info, h); |
| 2226 | |
| 2227 | return TRUE; |
| 2228 | } |
| 2229 | |
| 2230 | /* Fix up the flags for a symbol. This handles various cases which |
| 2231 | can only be fixed after all the input files are seen. This is |
| 2232 | currently called by both adjust_dynamic_symbol and |
| 2233 | assign_sym_version, which is unnecessary but perhaps more robust in |
| 2234 | the face of future changes. */ |
| 2235 | |
| 2236 | bfd_boolean |
| 2237 | _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h, |
| 2238 | struct elf_info_failed *eif) |
| 2239 | { |
| 2240 | const struct elf_backend_data *bed = NULL; |
| 2241 | |
| 2242 | /* If this symbol was mentioned in a non-ELF file, try to set |
| 2243 | DEF_REGULAR and REF_REGULAR correctly. This is the only way to |
| 2244 | permit a non-ELF file to correctly refer to a symbol defined in |
| 2245 | an ELF dynamic object. */ |
| 2246 | if (h->non_elf) |
| 2247 | { |
| 2248 | while (h->root.type == bfd_link_hash_indirect) |
| 2249 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2250 | |
| 2251 | if (h->root.type != bfd_link_hash_defined |
| 2252 | && h->root.type != bfd_link_hash_defweak) |
| 2253 | { |
| 2254 | h->ref_regular = 1; |
| 2255 | h->ref_regular_nonweak = 1; |
| 2256 | } |
| 2257 | else |
| 2258 | { |
| 2259 | if (h->root.u.def.section->owner != NULL |
| 2260 | && (bfd_get_flavour (h->root.u.def.section->owner) |
| 2261 | == bfd_target_elf_flavour)) |
| 2262 | { |
| 2263 | h->ref_regular = 1; |
| 2264 | h->ref_regular_nonweak = 1; |
| 2265 | } |
| 2266 | else |
| 2267 | h->def_regular = 1; |
| 2268 | } |
| 2269 | |
| 2270 | if (h->dynindx == -1 |
| 2271 | && (h->def_dynamic |
| 2272 | || h->ref_dynamic)) |
| 2273 | { |
| 2274 | if (! bfd_elf_link_record_dynamic_symbol (eif->info, h)) |
| 2275 | { |
| 2276 | eif->failed = TRUE; |
| 2277 | return FALSE; |
| 2278 | } |
| 2279 | } |
| 2280 | } |
| 2281 | else |
| 2282 | { |
| 2283 | /* Unfortunately, NON_ELF is only correct if the symbol |
| 2284 | was first seen in a non-ELF file. Fortunately, if the symbol |
| 2285 | was first seen in an ELF file, we're probably OK unless the |
| 2286 | symbol was defined in a non-ELF file. Catch that case here. |
| 2287 | FIXME: We're still in trouble if the symbol was first seen in |
| 2288 | a dynamic object, and then later in a non-ELF regular object. */ |
| 2289 | if ((h->root.type == bfd_link_hash_defined |
| 2290 | || h->root.type == bfd_link_hash_defweak) |
| 2291 | && !h->def_regular |
| 2292 | && (h->root.u.def.section->owner != NULL |
| 2293 | ? (bfd_get_flavour (h->root.u.def.section->owner) |
| 2294 | != bfd_target_elf_flavour) |
| 2295 | : (bfd_is_abs_section (h->root.u.def.section) |
| 2296 | && !h->def_dynamic))) |
| 2297 | h->def_regular = 1; |
| 2298 | } |
| 2299 | |
| 2300 | /* Backend specific symbol fixup. */ |
| 2301 | if (elf_hash_table (eif->info)->dynobj) |
| 2302 | { |
| 2303 | bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj); |
| 2304 | if (bed->elf_backend_fixup_symbol |
| 2305 | && !(*bed->elf_backend_fixup_symbol) (eif->info, h)) |
| 2306 | return FALSE; |
| 2307 | } |
| 2308 | |
| 2309 | /* If this is a final link, and the symbol was defined as a common |
| 2310 | symbol in a regular object file, and there was no definition in |
| 2311 | any dynamic object, then the linker will have allocated space for |
| 2312 | the symbol in a common section but the DEF_REGULAR |
| 2313 | flag will not have been set. */ |
| 2314 | if (h->root.type == bfd_link_hash_defined |
| 2315 | && !h->def_regular |
| 2316 | && h->ref_regular |
| 2317 | && !h->def_dynamic |
| 2318 | && (h->root.u.def.section->owner->flags & DYNAMIC) == 0) |
| 2319 | h->def_regular = 1; |
| 2320 | |
| 2321 | /* If -Bsymbolic was used (which means to bind references to global |
| 2322 | symbols to the definition within the shared object), and this |
| 2323 | symbol was defined in a regular object, then it actually doesn't |
| 2324 | need a PLT entry. Likewise, if the symbol has non-default |
| 2325 | visibility. If the symbol has hidden or internal visibility, we |
| 2326 | will force it local. */ |
| 2327 | if (h->needs_plt |
| 2328 | && eif->info->shared |
| 2329 | && is_elf_hash_table (eif->info->hash) |
| 2330 | && (eif->info->symbolic |
| 2331 | || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 2332 | && h->def_regular) |
| 2333 | { |
| 2334 | bfd_boolean force_local; |
| 2335 | |
| 2336 | force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL |
| 2337 | || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN); |
| 2338 | (*bed->elf_backend_hide_symbol) (eif->info, h, force_local); |
| 2339 | } |
| 2340 | |
| 2341 | /* If a weak undefined symbol has non-default visibility, we also |
| 2342 | hide it from the dynamic linker. */ |
| 2343 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 2344 | && h->root.type == bfd_link_hash_undefweak) |
| 2345 | { |
| 2346 | const struct elf_backend_data *bed; |
| 2347 | bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj); |
| 2348 | (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE); |
| 2349 | } |
| 2350 | |
| 2351 | /* If this is a weak defined symbol in a dynamic object, and we know |
| 2352 | the real definition in the dynamic object, copy interesting flags |
| 2353 | over to the real definition. */ |
| 2354 | if (h->u.weakdef != NULL) |
| 2355 | { |
| 2356 | struct elf_link_hash_entry *weakdef; |
| 2357 | |
| 2358 | weakdef = h->u.weakdef; |
| 2359 | if (h->root.type == bfd_link_hash_indirect) |
| 2360 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2361 | |
| 2362 | BFD_ASSERT (h->root.type == bfd_link_hash_defined |
| 2363 | || h->root.type == bfd_link_hash_defweak); |
| 2364 | BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined |
| 2365 | || weakdef->root.type == bfd_link_hash_defweak); |
| 2366 | BFD_ASSERT (weakdef->def_dynamic); |
| 2367 | |
| 2368 | /* If the real definition is defined by a regular object file, |
| 2369 | don't do anything special. See the longer description in |
| 2370 | _bfd_elf_adjust_dynamic_symbol, below. */ |
| 2371 | if (weakdef->def_regular) |
| 2372 | h->u.weakdef = NULL; |
| 2373 | else |
| 2374 | (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, |
| 2375 | h); |
| 2376 | } |
| 2377 | |
| 2378 | return TRUE; |
| 2379 | } |
| 2380 | |
| 2381 | /* Make the backend pick a good value for a dynamic symbol. This is |
| 2382 | called via elf_link_hash_traverse, and also calls itself |
| 2383 | recursively. */ |
| 2384 | |
| 2385 | bfd_boolean |
| 2386 | _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data) |
| 2387 | { |
| 2388 | struct elf_info_failed *eif = data; |
| 2389 | bfd *dynobj; |
| 2390 | const struct elf_backend_data *bed; |
| 2391 | |
| 2392 | if (! is_elf_hash_table (eif->info->hash)) |
| 2393 | return FALSE; |
| 2394 | |
| 2395 | if (h->root.type == bfd_link_hash_warning) |
| 2396 | { |
| 2397 | h->got = elf_hash_table (eif->info)->init_got_offset; |
| 2398 | h->plt = elf_hash_table (eif->info)->init_plt_offset; |
| 2399 | |
| 2400 | /* When warning symbols are created, they **replace** the "real" |
| 2401 | entry in the hash table, thus we never get to see the real |
| 2402 | symbol in a hash traversal. So look at it now. */ |
| 2403 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2404 | } |
| 2405 | |
| 2406 | /* Ignore indirect symbols. These are added by the versioning code. */ |
| 2407 | if (h->root.type == bfd_link_hash_indirect) |
| 2408 | return TRUE; |
| 2409 | |
| 2410 | /* Fix the symbol flags. */ |
| 2411 | if (! _bfd_elf_fix_symbol_flags (h, eif)) |
| 2412 | return FALSE; |
| 2413 | |
| 2414 | /* If this symbol does not require a PLT entry, and it is not |
| 2415 | defined by a dynamic object, or is not referenced by a regular |
| 2416 | object, ignore it. We do have to handle a weak defined symbol, |
| 2417 | even if no regular object refers to it, if we decided to add it |
| 2418 | to the dynamic symbol table. FIXME: Do we normally need to worry |
| 2419 | about symbols which are defined by one dynamic object and |
| 2420 | referenced by another one? */ |
| 2421 | if (!h->needs_plt |
| 2422 | && (h->def_regular |
| 2423 | || !h->def_dynamic |
| 2424 | || (!h->ref_regular |
| 2425 | && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1)))) |
| 2426 | { |
| 2427 | h->plt = elf_hash_table (eif->info)->init_plt_offset; |
| 2428 | return TRUE; |
| 2429 | } |
| 2430 | |
| 2431 | /* If we've already adjusted this symbol, don't do it again. This |
| 2432 | can happen via a recursive call. */ |
| 2433 | if (h->dynamic_adjusted) |
| 2434 | return TRUE; |
| 2435 | |
| 2436 | /* Don't look at this symbol again. Note that we must set this |
| 2437 | after checking the above conditions, because we may look at a |
| 2438 | symbol once, decide not to do anything, and then get called |
| 2439 | recursively later after REF_REGULAR is set below. */ |
| 2440 | h->dynamic_adjusted = 1; |
| 2441 | |
| 2442 | /* If this is a weak definition, and we know a real definition, and |
| 2443 | the real symbol is not itself defined by a regular object file, |
| 2444 | then get a good value for the real definition. We handle the |
| 2445 | real symbol first, for the convenience of the backend routine. |
| 2446 | |
| 2447 | Note that there is a confusing case here. If the real definition |
| 2448 | is defined by a regular object file, we don't get the real symbol |
| 2449 | from the dynamic object, but we do get the weak symbol. If the |
| 2450 | processor backend uses a COPY reloc, then if some routine in the |
| 2451 | dynamic object changes the real symbol, we will not see that |
| 2452 | change in the corresponding weak symbol. This is the way other |
| 2453 | ELF linkers work as well, and seems to be a result of the shared |
| 2454 | library model. |
| 2455 | |
| 2456 | I will clarify this issue. Most SVR4 shared libraries define the |
| 2457 | variable _timezone and define timezone as a weak synonym. The |
| 2458 | tzset call changes _timezone. If you write |
| 2459 | extern int timezone; |
| 2460 | int _timezone = 5; |
| 2461 | int main () { tzset (); printf ("%d %d\n", timezone, _timezone); } |
| 2462 | you might expect that, since timezone is a synonym for _timezone, |
| 2463 | the same number will print both times. However, if the processor |
| 2464 | backend uses a COPY reloc, then actually timezone will be copied |
| 2465 | into your process image, and, since you define _timezone |
| 2466 | yourself, _timezone will not. Thus timezone and _timezone will |
| 2467 | wind up at different memory locations. The tzset call will set |
| 2468 | _timezone, leaving timezone unchanged. */ |
| 2469 | |
| 2470 | if (h->u.weakdef != NULL) |
| 2471 | { |
| 2472 | /* If we get to this point, we know there is an implicit |
| 2473 | reference by a regular object file via the weak symbol H. |
| 2474 | FIXME: Is this really true? What if the traversal finds |
| 2475 | H->U.WEAKDEF before it finds H? */ |
| 2476 | h->u.weakdef->ref_regular = 1; |
| 2477 | |
| 2478 | if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif)) |
| 2479 | return FALSE; |
| 2480 | } |
| 2481 | |
| 2482 | /* If a symbol has no type and no size and does not require a PLT |
| 2483 | entry, then we are probably about to do the wrong thing here: we |
| 2484 | are probably going to create a COPY reloc for an empty object. |
| 2485 | This case can arise when a shared object is built with assembly |
| 2486 | code, and the assembly code fails to set the symbol type. */ |
| 2487 | if (h->size == 0 |
| 2488 | && h->type == STT_NOTYPE |
| 2489 | && !h->needs_plt) |
| 2490 | (*_bfd_error_handler) |
| 2491 | (_("warning: type and size of dynamic symbol `%s' are not defined"), |
| 2492 | h->root.root.string); |
| 2493 | |
| 2494 | dynobj = elf_hash_table (eif->info)->dynobj; |
| 2495 | bed = get_elf_backend_data (dynobj); |
| 2496 | if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h)) |
| 2497 | { |
| 2498 | eif->failed = TRUE; |
| 2499 | return FALSE; |
| 2500 | } |
| 2501 | |
| 2502 | return TRUE; |
| 2503 | } |
| 2504 | |
| 2505 | /* Adjust all external symbols pointing into SEC_MERGE sections |
| 2506 | to reflect the object merging within the sections. */ |
| 2507 | |
| 2508 | bfd_boolean |
| 2509 | _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data) |
| 2510 | { |
| 2511 | asection *sec; |
| 2512 | |
| 2513 | if (h->root.type == bfd_link_hash_warning) |
| 2514 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2515 | |
| 2516 | if ((h->root.type == bfd_link_hash_defined |
| 2517 | || h->root.type == bfd_link_hash_defweak) |
| 2518 | && ((sec = h->root.u.def.section)->flags & SEC_MERGE) |
| 2519 | && sec->sec_info_type == ELF_INFO_TYPE_MERGE) |
| 2520 | { |
| 2521 | bfd *output_bfd = data; |
| 2522 | |
| 2523 | h->root.u.def.value = |
| 2524 | _bfd_merged_section_offset (output_bfd, |
| 2525 | &h->root.u.def.section, |
| 2526 | elf_section_data (sec)->sec_info, |
| 2527 | h->root.u.def.value); |
| 2528 | } |
| 2529 | |
| 2530 | return TRUE; |
| 2531 | } |
| 2532 | |
| 2533 | /* Returns false if the symbol referred to by H should be considered |
| 2534 | to resolve local to the current module, and true if it should be |
| 2535 | considered to bind dynamically. */ |
| 2536 | |
| 2537 | bfd_boolean |
| 2538 | _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h, |
| 2539 | struct bfd_link_info *info, |
| 2540 | bfd_boolean ignore_protected) |
| 2541 | { |
| 2542 | bfd_boolean binding_stays_local_p; |
| 2543 | |
| 2544 | if (h == NULL) |
| 2545 | return FALSE; |
| 2546 | |
| 2547 | while (h->root.type == bfd_link_hash_indirect |
| 2548 | || h->root.type == bfd_link_hash_warning) |
| 2549 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2550 | |
| 2551 | /* If it was forced local, then clearly it's not dynamic. */ |
| 2552 | if (h->dynindx == -1) |
| 2553 | return FALSE; |
| 2554 | if (h->forced_local) |
| 2555 | return FALSE; |
| 2556 | |
| 2557 | /* Identify the cases where name binding rules say that a |
| 2558 | visible symbol resolves locally. */ |
| 2559 | binding_stays_local_p = info->executable || info->symbolic; |
| 2560 | |
| 2561 | switch (ELF_ST_VISIBILITY (h->other)) |
| 2562 | { |
| 2563 | case STV_INTERNAL: |
| 2564 | case STV_HIDDEN: |
| 2565 | return FALSE; |
| 2566 | |
| 2567 | case STV_PROTECTED: |
| 2568 | /* Proper resolution for function pointer equality may require |
| 2569 | that these symbols perhaps be resolved dynamically, even though |
| 2570 | we should be resolving them to the current module. */ |
| 2571 | if (!ignore_protected || h->type != STT_FUNC) |
| 2572 | binding_stays_local_p = TRUE; |
| 2573 | break; |
| 2574 | |
| 2575 | default: |
| 2576 | break; |
| 2577 | } |
| 2578 | |
| 2579 | /* If it isn't defined locally, then clearly it's dynamic. */ |
| 2580 | if (!h->def_regular) |
| 2581 | return TRUE; |
| 2582 | |
| 2583 | /* Otherwise, the symbol is dynamic if binding rules don't tell |
| 2584 | us that it remains local. */ |
| 2585 | return !binding_stays_local_p; |
| 2586 | } |
| 2587 | |
| 2588 | /* Return true if the symbol referred to by H should be considered |
| 2589 | to resolve local to the current module, and false otherwise. Differs |
| 2590 | from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of |
| 2591 | undefined symbols and weak symbols. */ |
| 2592 | |
| 2593 | bfd_boolean |
| 2594 | _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h, |
| 2595 | struct bfd_link_info *info, |
| 2596 | bfd_boolean local_protected) |
| 2597 | { |
| 2598 | /* If it's a local sym, of course we resolve locally. */ |
| 2599 | if (h == NULL) |
| 2600 | return TRUE; |
| 2601 | |
| 2602 | /* Common symbols that become definitions don't get the DEF_REGULAR |
| 2603 | flag set, so test it first, and don't bail out. */ |
| 2604 | if (ELF_COMMON_DEF_P (h)) |
| 2605 | /* Do nothing. */; |
| 2606 | /* If we don't have a definition in a regular file, then we can't |
| 2607 | resolve locally. The sym is either undefined or dynamic. */ |
| 2608 | else if (!h->def_regular) |
| 2609 | return FALSE; |
| 2610 | |
| 2611 | /* Forced local symbols resolve locally. */ |
| 2612 | if (h->forced_local) |
| 2613 | return TRUE; |
| 2614 | |
| 2615 | /* As do non-dynamic symbols. */ |
| 2616 | if (h->dynindx == -1) |
| 2617 | return TRUE; |
| 2618 | |
| 2619 | /* At this point, we know the symbol is defined and dynamic. In an |
| 2620 | executable it must resolve locally, likewise when building symbolic |
| 2621 | shared libraries. */ |
| 2622 | if (info->executable || info->symbolic) |
| 2623 | return TRUE; |
| 2624 | |
| 2625 | /* Now deal with defined dynamic symbols in shared libraries. Ones |
| 2626 | with default visibility might not resolve locally. */ |
| 2627 | if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
| 2628 | return FALSE; |
| 2629 | |
| 2630 | /* However, STV_HIDDEN or STV_INTERNAL ones must be local. */ |
| 2631 | if (ELF_ST_VISIBILITY (h->other) != STV_PROTECTED) |
| 2632 | return TRUE; |
| 2633 | |
| 2634 | /* STV_PROTECTED non-function symbols are local. */ |
| 2635 | if (h->type != STT_FUNC) |
| 2636 | return TRUE; |
| 2637 | |
| 2638 | /* Function pointer equality tests may require that STV_PROTECTED |
| 2639 | symbols be treated as dynamic symbols, even when we know that the |
| 2640 | dynamic linker will resolve them locally. */ |
| 2641 | return local_protected; |
| 2642 | } |
| 2643 | |
| 2644 | /* Caches some TLS segment info, and ensures that the TLS segment vma is |
| 2645 | aligned. Returns the first TLS output section. */ |
| 2646 | |
| 2647 | struct bfd_section * |
| 2648 | _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info) |
| 2649 | { |
| 2650 | struct bfd_section *sec, *tls; |
| 2651 | unsigned int align = 0; |
| 2652 | |
| 2653 | for (sec = obfd->sections; sec != NULL; sec = sec->next) |
| 2654 | if ((sec->flags & SEC_THREAD_LOCAL) != 0) |
| 2655 | break; |
| 2656 | tls = sec; |
| 2657 | |
| 2658 | for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next) |
| 2659 | if (sec->alignment_power > align) |
| 2660 | align = sec->alignment_power; |
| 2661 | |
| 2662 | elf_hash_table (info)->tls_sec = tls; |
| 2663 | |
| 2664 | /* Ensure the alignment of the first section is the largest alignment, |
| 2665 | so that the tls segment starts aligned. */ |
| 2666 | if (tls != NULL) |
| 2667 | tls->alignment_power = align; |
| 2668 | |
| 2669 | return tls; |
| 2670 | } |
| 2671 | |
| 2672 | /* Return TRUE iff this is a non-common, definition of a non-function symbol. */ |
| 2673 | static bfd_boolean |
| 2674 | is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED, |
| 2675 | Elf_Internal_Sym *sym) |
| 2676 | { |
| 2677 | const struct elf_backend_data *bed; |
| 2678 | |
| 2679 | /* Local symbols do not count, but target specific ones might. */ |
| 2680 | if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL |
| 2681 | && ELF_ST_BIND (sym->st_info) < STB_LOOS) |
| 2682 | return FALSE; |
| 2683 | |
| 2684 | /* Function symbols do not count. */ |
| 2685 | if (ELF_ST_TYPE (sym->st_info) == STT_FUNC) |
| 2686 | return FALSE; |
| 2687 | |
| 2688 | /* If the section is undefined, then so is the symbol. */ |
| 2689 | if (sym->st_shndx == SHN_UNDEF) |
| 2690 | return FALSE; |
| 2691 | |
| 2692 | /* If the symbol is defined in the common section, then |
| 2693 | it is a common definition and so does not count. */ |
| 2694 | bed = get_elf_backend_data (abfd); |
| 2695 | if (bed->common_definition (sym)) |
| 2696 | return FALSE; |
| 2697 | |
| 2698 | /* If the symbol is in a target specific section then we |
| 2699 | must rely upon the backend to tell us what it is. */ |
| 2700 | if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS) |
| 2701 | /* FIXME - this function is not coded yet: |
| 2702 | |
| 2703 | return _bfd_is_global_symbol_definition (abfd, sym); |
| 2704 | |
| 2705 | Instead for now assume that the definition is not global, |
| 2706 | Even if this is wrong, at least the linker will behave |
| 2707 | in the same way that it used to do. */ |
| 2708 | return FALSE; |
| 2709 | |
| 2710 | return TRUE; |
| 2711 | } |
| 2712 | |
| 2713 | /* Search the symbol table of the archive element of the archive ABFD |
| 2714 | whose archive map contains a mention of SYMDEF, and determine if |
| 2715 | the symbol is defined in this element. */ |
| 2716 | static bfd_boolean |
| 2717 | elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef) |
| 2718 | { |
| 2719 | Elf_Internal_Shdr * hdr; |
| 2720 | bfd_size_type symcount; |
| 2721 | bfd_size_type extsymcount; |
| 2722 | bfd_size_type extsymoff; |
| 2723 | Elf_Internal_Sym *isymbuf; |
| 2724 | Elf_Internal_Sym *isym; |
| 2725 | Elf_Internal_Sym *isymend; |
| 2726 | bfd_boolean result; |
| 2727 | |
| 2728 | abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset); |
| 2729 | if (abfd == NULL) |
| 2730 | return FALSE; |
| 2731 | |
| 2732 | if (! bfd_check_format (abfd, bfd_object)) |
| 2733 | return FALSE; |
| 2734 | |
| 2735 | /* If we have already included the element containing this symbol in the |
| 2736 | link then we do not need to include it again. Just claim that any symbol |
| 2737 | it contains is not a definition, so that our caller will not decide to |
| 2738 | (re)include this element. */ |
| 2739 | if (abfd->archive_pass) |
| 2740 | return FALSE; |
| 2741 | |
| 2742 | /* Select the appropriate symbol table. */ |
| 2743 | if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0) |
| 2744 | hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2745 | else |
| 2746 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; |
| 2747 | |
| 2748 | symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym; |
| 2749 | |
| 2750 | /* The sh_info field of the symtab header tells us where the |
| 2751 | external symbols start. We don't care about the local symbols. */ |
| 2752 | if (elf_bad_symtab (abfd)) |
| 2753 | { |
| 2754 | extsymcount = symcount; |
| 2755 | extsymoff = 0; |
| 2756 | } |
| 2757 | else |
| 2758 | { |
| 2759 | extsymcount = symcount - hdr->sh_info; |
| 2760 | extsymoff = hdr->sh_info; |
| 2761 | } |
| 2762 | |
| 2763 | if (extsymcount == 0) |
| 2764 | return FALSE; |
| 2765 | |
| 2766 | /* Read in the symbol table. */ |
| 2767 | isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff, |
| 2768 | NULL, NULL, NULL); |
| 2769 | if (isymbuf == NULL) |
| 2770 | return FALSE; |
| 2771 | |
| 2772 | /* Scan the symbol table looking for SYMDEF. */ |
| 2773 | result = FALSE; |
| 2774 | for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++) |
| 2775 | { |
| 2776 | const char *name; |
| 2777 | |
| 2778 | name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, |
| 2779 | isym->st_name); |
| 2780 | if (name == NULL) |
| 2781 | break; |
| 2782 | |
| 2783 | if (strcmp (name, symdef->name) == 0) |
| 2784 | { |
| 2785 | result = is_global_data_symbol_definition (abfd, isym); |
| 2786 | break; |
| 2787 | } |
| 2788 | } |
| 2789 | |
| 2790 | free (isymbuf); |
| 2791 | |
| 2792 | return result; |
| 2793 | } |
| 2794 | \f |
| 2795 | /* Add an entry to the .dynamic table. */ |
| 2796 | |
| 2797 | bfd_boolean |
| 2798 | _bfd_elf_add_dynamic_entry (struct bfd_link_info *info, |
| 2799 | bfd_vma tag, |
| 2800 | bfd_vma val) |
| 2801 | { |
| 2802 | struct elf_link_hash_table *hash_table; |
| 2803 | const struct elf_backend_data *bed; |
| 2804 | asection *s; |
| 2805 | bfd_size_type newsize; |
| 2806 | bfd_byte *newcontents; |
| 2807 | Elf_Internal_Dyn dyn; |
| 2808 | |
| 2809 | hash_table = elf_hash_table (info); |
| 2810 | if (! is_elf_hash_table (hash_table)) |
| 2811 | return FALSE; |
| 2812 | |
| 2813 | bed = get_elf_backend_data (hash_table->dynobj); |
| 2814 | s = bfd_get_section_by_name (hash_table->dynobj, ".dynamic"); |
| 2815 | BFD_ASSERT (s != NULL); |
| 2816 | |
| 2817 | newsize = s->size + bed->s->sizeof_dyn; |
| 2818 | newcontents = bfd_realloc (s->contents, newsize); |
| 2819 | if (newcontents == NULL) |
| 2820 | return FALSE; |
| 2821 | |
| 2822 | dyn.d_tag = tag; |
| 2823 | dyn.d_un.d_val = val; |
| 2824 | bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size); |
| 2825 | |
| 2826 | s->size = newsize; |
| 2827 | s->contents = newcontents; |
| 2828 | |
| 2829 | return TRUE; |
| 2830 | } |
| 2831 | |
| 2832 | /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true, |
| 2833 | otherwise just check whether one already exists. Returns -1 on error, |
| 2834 | 1 if a DT_NEEDED tag already exists, and 0 on success. */ |
| 2835 | |
| 2836 | static int |
| 2837 | elf_add_dt_needed_tag (bfd *abfd, |
| 2838 | struct bfd_link_info *info, |
| 2839 | const char *soname, |
| 2840 | bfd_boolean do_it) |
| 2841 | { |
| 2842 | struct elf_link_hash_table *hash_table; |
| 2843 | bfd_size_type oldsize; |
| 2844 | bfd_size_type strindex; |
| 2845 | |
| 2846 | if (!_bfd_elf_link_create_dynstrtab (abfd, info)) |
| 2847 | return -1; |
| 2848 | |
| 2849 | hash_table = elf_hash_table (info); |
| 2850 | oldsize = _bfd_elf_strtab_size (hash_table->dynstr); |
| 2851 | strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE); |
| 2852 | if (strindex == (bfd_size_type) -1) |
| 2853 | return -1; |
| 2854 | |
| 2855 | if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr)) |
| 2856 | { |
| 2857 | asection *sdyn; |
| 2858 | const struct elf_backend_data *bed; |
| 2859 | bfd_byte *extdyn; |
| 2860 | |
| 2861 | bed = get_elf_backend_data (hash_table->dynobj); |
| 2862 | sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic"); |
| 2863 | if (sdyn != NULL) |
| 2864 | for (extdyn = sdyn->contents; |
| 2865 | extdyn < sdyn->contents + sdyn->size; |
| 2866 | extdyn += bed->s->sizeof_dyn) |
| 2867 | { |
| 2868 | Elf_Internal_Dyn dyn; |
| 2869 | |
| 2870 | bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn); |
| 2871 | if (dyn.d_tag == DT_NEEDED |
| 2872 | && dyn.d_un.d_val == strindex) |
| 2873 | { |
| 2874 | _bfd_elf_strtab_delref (hash_table->dynstr, strindex); |
| 2875 | return 1; |
| 2876 | } |
| 2877 | } |
| 2878 | } |
| 2879 | |
| 2880 | if (do_it) |
| 2881 | { |
| 2882 | if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info)) |
| 2883 | return -1; |
| 2884 | |
| 2885 | if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex)) |
| 2886 | return -1; |
| 2887 | } |
| 2888 | else |
| 2889 | /* We were just checking for existence of the tag. */ |
| 2890 | _bfd_elf_strtab_delref (hash_table->dynstr, strindex); |
| 2891 | |
| 2892 | return 0; |
| 2893 | } |
| 2894 | |
| 2895 | /* Sort symbol by value and section. */ |
| 2896 | static int |
| 2897 | elf_sort_symbol (const void *arg1, const void *arg2) |
| 2898 | { |
| 2899 | const struct elf_link_hash_entry *h1; |
| 2900 | const struct elf_link_hash_entry *h2; |
| 2901 | bfd_signed_vma vdiff; |
| 2902 | |
| 2903 | h1 = *(const struct elf_link_hash_entry **) arg1; |
| 2904 | h2 = *(const struct elf_link_hash_entry **) arg2; |
| 2905 | vdiff = h1->root.u.def.value - h2->root.u.def.value; |
| 2906 | if (vdiff != 0) |
| 2907 | return vdiff > 0 ? 1 : -1; |
| 2908 | else |
| 2909 | { |
| 2910 | long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id; |
| 2911 | if (sdiff != 0) |
| 2912 | return sdiff > 0 ? 1 : -1; |
| 2913 | } |
| 2914 | return 0; |
| 2915 | } |
| 2916 | |
| 2917 | /* This function is used to adjust offsets into .dynstr for |
| 2918 | dynamic symbols. This is called via elf_link_hash_traverse. */ |
| 2919 | |
| 2920 | static bfd_boolean |
| 2921 | elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data) |
| 2922 | { |
| 2923 | struct elf_strtab_hash *dynstr = data; |
| 2924 | |
| 2925 | if (h->root.type == bfd_link_hash_warning) |
| 2926 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2927 | |
| 2928 | if (h->dynindx != -1) |
| 2929 | h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index); |
| 2930 | return TRUE; |
| 2931 | } |
| 2932 | |
| 2933 | /* Assign string offsets in .dynstr, update all structures referencing |
| 2934 | them. */ |
| 2935 | |
| 2936 | static bfd_boolean |
| 2937 | elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info) |
| 2938 | { |
| 2939 | struct elf_link_hash_table *hash_table = elf_hash_table (info); |
| 2940 | struct elf_link_local_dynamic_entry *entry; |
| 2941 | struct elf_strtab_hash *dynstr = hash_table->dynstr; |
| 2942 | bfd *dynobj = hash_table->dynobj; |
| 2943 | asection *sdyn; |
| 2944 | bfd_size_type size; |
| 2945 | const struct elf_backend_data *bed; |
| 2946 | bfd_byte *extdyn; |
| 2947 | |
| 2948 | _bfd_elf_strtab_finalize (dynstr); |
| 2949 | size = _bfd_elf_strtab_size (dynstr); |
| 2950 | |
| 2951 | bed = get_elf_backend_data (dynobj); |
| 2952 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 2953 | BFD_ASSERT (sdyn != NULL); |
| 2954 | |
| 2955 | /* Update all .dynamic entries referencing .dynstr strings. */ |
| 2956 | for (extdyn = sdyn->contents; |
| 2957 | extdyn < sdyn->contents + sdyn->size; |
| 2958 | extdyn += bed->s->sizeof_dyn) |
| 2959 | { |
| 2960 | Elf_Internal_Dyn dyn; |
| 2961 | |
| 2962 | bed->s->swap_dyn_in (dynobj, extdyn, &dyn); |
| 2963 | switch (dyn.d_tag) |
| 2964 | { |
| 2965 | case DT_STRSZ: |
| 2966 | dyn.d_un.d_val = size; |
| 2967 | break; |
| 2968 | case DT_NEEDED: |
| 2969 | case DT_SONAME: |
| 2970 | case DT_RPATH: |
| 2971 | case DT_RUNPATH: |
| 2972 | case DT_FILTER: |
| 2973 | case DT_AUXILIARY: |
| 2974 | dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val); |
| 2975 | break; |
| 2976 | default: |
| 2977 | continue; |
| 2978 | } |
| 2979 | bed->s->swap_dyn_out (dynobj, &dyn, extdyn); |
| 2980 | } |
| 2981 | |
| 2982 | /* Now update local dynamic symbols. */ |
| 2983 | for (entry = hash_table->dynlocal; entry ; entry = entry->next) |
| 2984 | entry->isym.st_name = _bfd_elf_strtab_offset (dynstr, |
| 2985 | entry->isym.st_name); |
| 2986 | |
| 2987 | /* And the rest of dynamic symbols. */ |
| 2988 | elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr); |
| 2989 | |
| 2990 | /* Adjust version definitions. */ |
| 2991 | if (elf_tdata (output_bfd)->cverdefs) |
| 2992 | { |
| 2993 | asection *s; |
| 2994 | bfd_byte *p; |
| 2995 | bfd_size_type i; |
| 2996 | Elf_Internal_Verdef def; |
| 2997 | Elf_Internal_Verdaux defaux; |
| 2998 | |
| 2999 | s = bfd_get_section_by_name (dynobj, ".gnu.version_d"); |
| 3000 | p = s->contents; |
| 3001 | do |
| 3002 | { |
| 3003 | _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p, |
| 3004 | &def); |
| 3005 | p += sizeof (Elf_External_Verdef); |
| 3006 | if (def.vd_aux != sizeof (Elf_External_Verdef)) |
| 3007 | continue; |
| 3008 | for (i = 0; i < def.vd_cnt; ++i) |
| 3009 | { |
| 3010 | _bfd_elf_swap_verdaux_in (output_bfd, |
| 3011 | (Elf_External_Verdaux *) p, &defaux); |
| 3012 | defaux.vda_name = _bfd_elf_strtab_offset (dynstr, |
| 3013 | defaux.vda_name); |
| 3014 | _bfd_elf_swap_verdaux_out (output_bfd, |
| 3015 | &defaux, (Elf_External_Verdaux *) p); |
| 3016 | p += sizeof (Elf_External_Verdaux); |
| 3017 | } |
| 3018 | } |
| 3019 | while (def.vd_next); |
| 3020 | } |
| 3021 | |
| 3022 | /* Adjust version references. */ |
| 3023 | if (elf_tdata (output_bfd)->verref) |
| 3024 | { |
| 3025 | asection *s; |
| 3026 | bfd_byte *p; |
| 3027 | bfd_size_type i; |
| 3028 | Elf_Internal_Verneed need; |
| 3029 | Elf_Internal_Vernaux needaux; |
| 3030 | |
| 3031 | s = bfd_get_section_by_name (dynobj, ".gnu.version_r"); |
| 3032 | p = s->contents; |
| 3033 | do |
| 3034 | { |
| 3035 | _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p, |
| 3036 | &need); |
| 3037 | need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file); |
| 3038 | _bfd_elf_swap_verneed_out (output_bfd, &need, |
| 3039 | (Elf_External_Verneed *) p); |
| 3040 | p += sizeof (Elf_External_Verneed); |
| 3041 | for (i = 0; i < need.vn_cnt; ++i) |
| 3042 | { |
| 3043 | _bfd_elf_swap_vernaux_in (output_bfd, |
| 3044 | (Elf_External_Vernaux *) p, &needaux); |
| 3045 | needaux.vna_name = _bfd_elf_strtab_offset (dynstr, |
| 3046 | needaux.vna_name); |
| 3047 | _bfd_elf_swap_vernaux_out (output_bfd, |
| 3048 | &needaux, |
| 3049 | (Elf_External_Vernaux *) p); |
| 3050 | p += sizeof (Elf_External_Vernaux); |
| 3051 | } |
| 3052 | } |
| 3053 | while (need.vn_next); |
| 3054 | } |
| 3055 | |
| 3056 | return TRUE; |
| 3057 | } |
| 3058 | \f |
| 3059 | /* Add symbols from an ELF object file to the linker hash table. */ |
| 3060 | |
| 3061 | static bfd_boolean |
| 3062 | elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info) |
| 3063 | { |
| 3064 | Elf_Internal_Shdr *hdr; |
| 3065 | bfd_size_type symcount; |
| 3066 | bfd_size_type extsymcount; |
| 3067 | bfd_size_type extsymoff; |
| 3068 | struct elf_link_hash_entry **sym_hash; |
| 3069 | bfd_boolean dynamic; |
| 3070 | Elf_External_Versym *extversym = NULL; |
| 3071 | Elf_External_Versym *ever; |
| 3072 | struct elf_link_hash_entry *weaks; |
| 3073 | struct elf_link_hash_entry **nondeflt_vers = NULL; |
| 3074 | bfd_size_type nondeflt_vers_cnt = 0; |
| 3075 | Elf_Internal_Sym *isymbuf = NULL; |
| 3076 | Elf_Internal_Sym *isym; |
| 3077 | Elf_Internal_Sym *isymend; |
| 3078 | const struct elf_backend_data *bed; |
| 3079 | bfd_boolean add_needed; |
| 3080 | struct elf_link_hash_table *htab; |
| 3081 | bfd_size_type amt; |
| 3082 | void *alloc_mark = NULL; |
| 3083 | void *old_tab = NULL; |
| 3084 | void *old_hash; |
| 3085 | void *old_ent; |
| 3086 | struct bfd_link_hash_entry *old_undefs = NULL; |
| 3087 | struct bfd_link_hash_entry *old_undefs_tail = NULL; |
| 3088 | long old_dynsymcount = 0; |
| 3089 | size_t tabsize = 0; |
| 3090 | size_t hashsize = 0; |
| 3091 | |
| 3092 | htab = elf_hash_table (info); |
| 3093 | bed = get_elf_backend_data (abfd); |
| 3094 | |
| 3095 | if ((abfd->flags & DYNAMIC) == 0) |
| 3096 | dynamic = FALSE; |
| 3097 | else |
| 3098 | { |
| 3099 | dynamic = TRUE; |
| 3100 | |
| 3101 | /* You can't use -r against a dynamic object. Also, there's no |
| 3102 | hope of using a dynamic object which does not exactly match |
| 3103 | the format of the output file. */ |
| 3104 | if (info->relocatable |
| 3105 | || !is_elf_hash_table (htab) |
| 3106 | || htab->root.creator != abfd->xvec) |
| 3107 | { |
| 3108 | if (info->relocatable) |
| 3109 | bfd_set_error (bfd_error_invalid_operation); |
| 3110 | else |
| 3111 | bfd_set_error (bfd_error_wrong_format); |
| 3112 | goto error_return; |
| 3113 | } |
| 3114 | } |
| 3115 | |
| 3116 | /* As a GNU extension, any input sections which are named |
| 3117 | .gnu.warning.SYMBOL are treated as warning symbols for the given |
| 3118 | symbol. This differs from .gnu.warning sections, which generate |
| 3119 | warnings when they are included in an output file. */ |
| 3120 | if (info->executable) |
| 3121 | { |
| 3122 | asection *s; |
| 3123 | |
| 3124 | for (s = abfd->sections; s != NULL; s = s->next) |
| 3125 | { |
| 3126 | const char *name; |
| 3127 | |
| 3128 | name = bfd_get_section_name (abfd, s); |
| 3129 | if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0) |
| 3130 | { |
| 3131 | char *msg; |
| 3132 | bfd_size_type sz; |
| 3133 | |
| 3134 | name += sizeof ".gnu.warning." - 1; |
| 3135 | |
| 3136 | /* If this is a shared object, then look up the symbol |
| 3137 | in the hash table. If it is there, and it is already |
| 3138 | been defined, then we will not be using the entry |
| 3139 | from this shared object, so we don't need to warn. |
| 3140 | FIXME: If we see the definition in a regular object |
| 3141 | later on, we will warn, but we shouldn't. The only |
| 3142 | fix is to keep track of what warnings we are supposed |
| 3143 | to emit, and then handle them all at the end of the |
| 3144 | link. */ |
| 3145 | if (dynamic) |
| 3146 | { |
| 3147 | struct elf_link_hash_entry *h; |
| 3148 | |
| 3149 | h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE); |
| 3150 | |
| 3151 | /* FIXME: What about bfd_link_hash_common? */ |
| 3152 | if (h != NULL |
| 3153 | && (h->root.type == bfd_link_hash_defined |
| 3154 | || h->root.type == bfd_link_hash_defweak)) |
| 3155 | { |
| 3156 | /* We don't want to issue this warning. Clobber |
| 3157 | the section size so that the warning does not |
| 3158 | get copied into the output file. */ |
| 3159 | s->size = 0; |
| 3160 | continue; |
| 3161 | } |
| 3162 | } |
| 3163 | |
| 3164 | sz = s->size; |
| 3165 | msg = bfd_alloc (abfd, sz + 1); |
| 3166 | if (msg == NULL) |
| 3167 | goto error_return; |
| 3168 | |
| 3169 | if (! bfd_get_section_contents (abfd, s, msg, 0, sz)) |
| 3170 | goto error_return; |
| 3171 | |
| 3172 | msg[sz] = '\0'; |
| 3173 | |
| 3174 | if (! (_bfd_generic_link_add_one_symbol |
| 3175 | (info, abfd, name, BSF_WARNING, s, 0, msg, |
| 3176 | FALSE, bed->collect, NULL))) |
| 3177 | goto error_return; |
| 3178 | |
| 3179 | if (! info->relocatable) |
| 3180 | { |
| 3181 | /* Clobber the section size so that the warning does |
| 3182 | not get copied into the output file. */ |
| 3183 | s->size = 0; |
| 3184 | |
| 3185 | /* Also set SEC_EXCLUDE, so that symbols defined in |
| 3186 | the warning section don't get copied to the output. */ |
| 3187 | s->flags |= SEC_EXCLUDE; |
| 3188 | } |
| 3189 | } |
| 3190 | } |
| 3191 | } |
| 3192 | |
| 3193 | add_needed = TRUE; |
| 3194 | if (! dynamic) |
| 3195 | { |
| 3196 | /* If we are creating a shared library, create all the dynamic |
| 3197 | sections immediately. We need to attach them to something, |
| 3198 | so we attach them to this BFD, provided it is the right |
| 3199 | format. FIXME: If there are no input BFD's of the same |
| 3200 | format as the output, we can't make a shared library. */ |
| 3201 | if (info->shared |
| 3202 | && is_elf_hash_table (htab) |
| 3203 | && htab->root.creator == abfd->xvec |
| 3204 | && !htab->dynamic_sections_created) |
| 3205 | { |
| 3206 | if (! _bfd_elf_link_create_dynamic_sections (abfd, info)) |
| 3207 | goto error_return; |
| 3208 | } |
| 3209 | } |
| 3210 | else if (!is_elf_hash_table (htab)) |
| 3211 | goto error_return; |
| 3212 | else |
| 3213 | { |
| 3214 | asection *s; |
| 3215 | const char *soname = NULL; |
| 3216 | struct bfd_link_needed_list *rpath = NULL, *runpath = NULL; |
| 3217 | int ret; |
| 3218 | |
| 3219 | /* ld --just-symbols and dynamic objects don't mix very well. |
| 3220 | ld shouldn't allow it. */ |
| 3221 | if ((s = abfd->sections) != NULL |
| 3222 | && s->sec_info_type == ELF_INFO_TYPE_JUST_SYMS) |
| 3223 | abort (); |
| 3224 | |
| 3225 | /* If this dynamic lib was specified on the command line with |
| 3226 | --as-needed in effect, then we don't want to add a DT_NEEDED |
| 3227 | tag unless the lib is actually used. Similary for libs brought |
| 3228 | in by another lib's DT_NEEDED. When --no-add-needed is used |
| 3229 | on a dynamic lib, we don't want to add a DT_NEEDED entry for |
| 3230 | any dynamic library in DT_NEEDED tags in the dynamic lib at |
| 3231 | all. */ |
| 3232 | add_needed = (elf_dyn_lib_class (abfd) |
| 3233 | & (DYN_AS_NEEDED | DYN_DT_NEEDED |
| 3234 | | DYN_NO_NEEDED)) == 0; |
| 3235 | |
| 3236 | s = bfd_get_section_by_name (abfd, ".dynamic"); |
| 3237 | if (s != NULL) |
| 3238 | { |
| 3239 | bfd_byte *dynbuf; |
| 3240 | bfd_byte *extdyn; |
| 3241 | int elfsec; |
| 3242 | unsigned long shlink; |
| 3243 | |
| 3244 | if (!bfd_malloc_and_get_section (abfd, s, &dynbuf)) |
| 3245 | goto error_free_dyn; |
| 3246 | |
| 3247 | elfsec = _bfd_elf_section_from_bfd_section (abfd, s); |
| 3248 | if (elfsec == -1) |
| 3249 | goto error_free_dyn; |
| 3250 | shlink = elf_elfsections (abfd)[elfsec]->sh_link; |
| 3251 | |
| 3252 | for (extdyn = dynbuf; |
| 3253 | extdyn < dynbuf + s->size; |
| 3254 | extdyn += bed->s->sizeof_dyn) |
| 3255 | { |
| 3256 | Elf_Internal_Dyn dyn; |
| 3257 | |
| 3258 | bed->s->swap_dyn_in (abfd, extdyn, &dyn); |
| 3259 | if (dyn.d_tag == DT_SONAME) |
| 3260 | { |
| 3261 | unsigned int tagv = dyn.d_un.d_val; |
| 3262 | soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 3263 | if (soname == NULL) |
| 3264 | goto error_free_dyn; |
| 3265 | } |
| 3266 | if (dyn.d_tag == DT_NEEDED) |
| 3267 | { |
| 3268 | struct bfd_link_needed_list *n, **pn; |
| 3269 | char *fnm, *anm; |
| 3270 | unsigned int tagv = dyn.d_un.d_val; |
| 3271 | |
| 3272 | amt = sizeof (struct bfd_link_needed_list); |
| 3273 | n = bfd_alloc (abfd, amt); |
| 3274 | fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 3275 | if (n == NULL || fnm == NULL) |
| 3276 | goto error_free_dyn; |
| 3277 | amt = strlen (fnm) + 1; |
| 3278 | anm = bfd_alloc (abfd, amt); |
| 3279 | if (anm == NULL) |
| 3280 | goto error_free_dyn; |
| 3281 | memcpy (anm, fnm, amt); |
| 3282 | n->name = anm; |
| 3283 | n->by = abfd; |
| 3284 | n->next = NULL; |
| 3285 | for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next) |
| 3286 | ; |
| 3287 | *pn = n; |
| 3288 | } |
| 3289 | if (dyn.d_tag == DT_RUNPATH) |
| 3290 | { |
| 3291 | struct bfd_link_needed_list *n, **pn; |
| 3292 | char *fnm, *anm; |
| 3293 | unsigned int tagv = dyn.d_un.d_val; |
| 3294 | |
| 3295 | amt = sizeof (struct bfd_link_needed_list); |
| 3296 | n = bfd_alloc (abfd, amt); |
| 3297 | fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 3298 | if (n == NULL || fnm == NULL) |
| 3299 | goto error_free_dyn; |
| 3300 | amt = strlen (fnm) + 1; |
| 3301 | anm = bfd_alloc (abfd, amt); |
| 3302 | if (anm == NULL) |
| 3303 | goto error_free_dyn; |
| 3304 | memcpy (anm, fnm, amt); |
| 3305 | n->name = anm; |
| 3306 | n->by = abfd; |
| 3307 | n->next = NULL; |
| 3308 | for (pn = & runpath; |
| 3309 | *pn != NULL; |
| 3310 | pn = &(*pn)->next) |
| 3311 | ; |
| 3312 | *pn = n; |
| 3313 | } |
| 3314 | /* Ignore DT_RPATH if we have seen DT_RUNPATH. */ |
| 3315 | if (!runpath && dyn.d_tag == DT_RPATH) |
| 3316 | { |
| 3317 | struct bfd_link_needed_list *n, **pn; |
| 3318 | char *fnm, *anm; |
| 3319 | unsigned int tagv = dyn.d_un.d_val; |
| 3320 | |
| 3321 | amt = sizeof (struct bfd_link_needed_list); |
| 3322 | n = bfd_alloc (abfd, amt); |
| 3323 | fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv); |
| 3324 | if (n == NULL || fnm == NULL) |
| 3325 | goto error_free_dyn; |
| 3326 | amt = strlen (fnm) + 1; |
| 3327 | anm = bfd_alloc (abfd, amt); |
| 3328 | if (anm == NULL) |
| 3329 | { |
| 3330 | error_free_dyn: |
| 3331 | free (dynbuf); |
| 3332 | goto error_return; |
| 3333 | } |
| 3334 | memcpy (anm, fnm, amt); |
| 3335 | n->name = anm; |
| 3336 | n->by = abfd; |
| 3337 | n->next = NULL; |
| 3338 | for (pn = & rpath; |
| 3339 | *pn != NULL; |
| 3340 | pn = &(*pn)->next) |
| 3341 | ; |
| 3342 | *pn = n; |
| 3343 | } |
| 3344 | } |
| 3345 | |
| 3346 | free (dynbuf); |
| 3347 | } |
| 3348 | |
| 3349 | /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that |
| 3350 | frees all more recently bfd_alloc'd blocks as well. */ |
| 3351 | if (runpath) |
| 3352 | rpath = runpath; |
| 3353 | |
| 3354 | if (rpath) |
| 3355 | { |
| 3356 | struct bfd_link_needed_list **pn; |
| 3357 | for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next) |
| 3358 | ; |
| 3359 | *pn = rpath; |
| 3360 | } |
| 3361 | |
| 3362 | /* We do not want to include any of the sections in a dynamic |
| 3363 | object in the output file. We hack by simply clobbering the |
| 3364 | list of sections in the BFD. This could be handled more |
| 3365 | cleanly by, say, a new section flag; the existing |
| 3366 | SEC_NEVER_LOAD flag is not the one we want, because that one |
| 3367 | still implies that the section takes up space in the output |
| 3368 | file. */ |
| 3369 | bfd_section_list_clear (abfd); |
| 3370 | |
| 3371 | /* Find the name to use in a DT_NEEDED entry that refers to this |
| 3372 | object. If the object has a DT_SONAME entry, we use it. |
| 3373 | Otherwise, if the generic linker stuck something in |
| 3374 | elf_dt_name, we use that. Otherwise, we just use the file |
| 3375 | name. */ |
| 3376 | if (soname == NULL || *soname == '\0') |
| 3377 | { |
| 3378 | soname = elf_dt_name (abfd); |
| 3379 | if (soname == NULL || *soname == '\0') |
| 3380 | soname = bfd_get_filename (abfd); |
| 3381 | } |
| 3382 | |
| 3383 | /* Save the SONAME because sometimes the linker emulation code |
| 3384 | will need to know it. */ |
| 3385 | elf_dt_name (abfd) = soname; |
| 3386 | |
| 3387 | ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed); |
| 3388 | if (ret < 0) |
| 3389 | goto error_return; |
| 3390 | |
| 3391 | /* If we have already included this dynamic object in the |
| 3392 | link, just ignore it. There is no reason to include a |
| 3393 | particular dynamic object more than once. */ |
| 3394 | if (ret > 0) |
| 3395 | return TRUE; |
| 3396 | } |
| 3397 | |
| 3398 | /* If this is a dynamic object, we always link against the .dynsym |
| 3399 | symbol table, not the .symtab symbol table. The dynamic linker |
| 3400 | will only see the .dynsym symbol table, so there is no reason to |
| 3401 | look at .symtab for a dynamic object. */ |
| 3402 | |
| 3403 | if (! dynamic || elf_dynsymtab (abfd) == 0) |
| 3404 | hdr = &elf_tdata (abfd)->symtab_hdr; |
| 3405 | else |
| 3406 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; |
| 3407 | |
| 3408 | symcount = hdr->sh_size / bed->s->sizeof_sym; |
| 3409 | |
| 3410 | /* The sh_info field of the symtab header tells us where the |
| 3411 | external symbols start. We don't care about the local symbols at |
| 3412 | this point. */ |
| 3413 | if (elf_bad_symtab (abfd)) |
| 3414 | { |
| 3415 | extsymcount = symcount; |
| 3416 | extsymoff = 0; |
| 3417 | } |
| 3418 | else |
| 3419 | { |
| 3420 | extsymcount = symcount - hdr->sh_info; |
| 3421 | extsymoff = hdr->sh_info; |
| 3422 | } |
| 3423 | |
| 3424 | sym_hash = NULL; |
| 3425 | if (extsymcount != 0) |
| 3426 | { |
| 3427 | isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff, |
| 3428 | NULL, NULL, NULL); |
| 3429 | if (isymbuf == NULL) |
| 3430 | goto error_return; |
| 3431 | |
| 3432 | /* We store a pointer to the hash table entry for each external |
| 3433 | symbol. */ |
| 3434 | amt = extsymcount * sizeof (struct elf_link_hash_entry *); |
| 3435 | sym_hash = bfd_alloc (abfd, amt); |
| 3436 | if (sym_hash == NULL) |
| 3437 | goto error_free_sym; |
| 3438 | elf_sym_hashes (abfd) = sym_hash; |
| 3439 | } |
| 3440 | |
| 3441 | if (dynamic) |
| 3442 | { |
| 3443 | /* Read in any version definitions. */ |
| 3444 | if (!_bfd_elf_slurp_version_tables (abfd, |
| 3445 | info->default_imported_symver)) |
| 3446 | goto error_free_sym; |
| 3447 | |
| 3448 | /* Read in the symbol versions, but don't bother to convert them |
| 3449 | to internal format. */ |
| 3450 | if (elf_dynversym (abfd) != 0) |
| 3451 | { |
| 3452 | Elf_Internal_Shdr *versymhdr; |
| 3453 | |
| 3454 | versymhdr = &elf_tdata (abfd)->dynversym_hdr; |
| 3455 | extversym = bfd_malloc (versymhdr->sh_size); |
| 3456 | if (extversym == NULL) |
| 3457 | goto error_free_sym; |
| 3458 | amt = versymhdr->sh_size; |
| 3459 | if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0 |
| 3460 | || bfd_bread (extversym, amt, abfd) != amt) |
| 3461 | goto error_free_vers; |
| 3462 | } |
| 3463 | } |
| 3464 | |
| 3465 | /* If we are loading an as-needed shared lib, save the symbol table |
| 3466 | state before we start adding symbols. If the lib turns out |
| 3467 | to be unneeded, restore the state. */ |
| 3468 | if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0) |
| 3469 | { |
| 3470 | unsigned int i; |
| 3471 | size_t entsize; |
| 3472 | |
| 3473 | for (entsize = 0, i = 0; i < htab->root.table.size; i++) |
| 3474 | { |
| 3475 | struct bfd_hash_entry *p; |
| 3476 | struct elf_link_hash_entry *h; |
| 3477 | |
| 3478 | for (p = htab->root.table.table[i]; p != NULL; p = p->next) |
| 3479 | { |
| 3480 | h = (struct elf_link_hash_entry *) p; |
| 3481 | entsize += htab->root.table.entsize; |
| 3482 | if (h->root.type == bfd_link_hash_warning) |
| 3483 | entsize += htab->root.table.entsize; |
| 3484 | } |
| 3485 | } |
| 3486 | |
| 3487 | tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *); |
| 3488 | hashsize = extsymcount * sizeof (struct elf_link_hash_entry *); |
| 3489 | old_tab = bfd_malloc (tabsize + entsize + hashsize); |
| 3490 | if (old_tab == NULL) |
| 3491 | goto error_free_vers; |
| 3492 | |
| 3493 | /* Remember the current objalloc pointer, so that all mem for |
| 3494 | symbols added can later be reclaimed. */ |
| 3495 | alloc_mark = bfd_hash_allocate (&htab->root.table, 1); |
| 3496 | if (alloc_mark == NULL) |
| 3497 | goto error_free_vers; |
| 3498 | |
| 3499 | /* Clone the symbol table and sym hashes. Remember some |
| 3500 | pointers into the symbol table, and dynamic symbol count. */ |
| 3501 | old_hash = (char *) old_tab + tabsize; |
| 3502 | old_ent = (char *) old_hash + hashsize; |
| 3503 | memcpy (old_tab, htab->root.table.table, tabsize); |
| 3504 | memcpy (old_hash, sym_hash, hashsize); |
| 3505 | old_undefs = htab->root.undefs; |
| 3506 | old_undefs_tail = htab->root.undefs_tail; |
| 3507 | old_dynsymcount = htab->dynsymcount; |
| 3508 | |
| 3509 | for (i = 0; i < htab->root.table.size; i++) |
| 3510 | { |
| 3511 | struct bfd_hash_entry *p; |
| 3512 | struct elf_link_hash_entry *h; |
| 3513 | |
| 3514 | for (p = htab->root.table.table[i]; p != NULL; p = p->next) |
| 3515 | { |
| 3516 | memcpy (old_ent, p, htab->root.table.entsize); |
| 3517 | old_ent = (char *) old_ent + htab->root.table.entsize; |
| 3518 | h = (struct elf_link_hash_entry *) p; |
| 3519 | if (h->root.type == bfd_link_hash_warning) |
| 3520 | { |
| 3521 | memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize); |
| 3522 | old_ent = (char *) old_ent + htab->root.table.entsize; |
| 3523 | } |
| 3524 | } |
| 3525 | } |
| 3526 | } |
| 3527 | |
| 3528 | weaks = NULL; |
| 3529 | ever = extversym != NULL ? extversym + extsymoff : NULL; |
| 3530 | for (isym = isymbuf, isymend = isymbuf + extsymcount; |
| 3531 | isym < isymend; |
| 3532 | isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL)) |
| 3533 | { |
| 3534 | int bind; |
| 3535 | bfd_vma value; |
| 3536 | asection *sec, *new_sec; |
| 3537 | flagword flags; |
| 3538 | const char *name; |
| 3539 | struct elf_link_hash_entry *h; |
| 3540 | bfd_boolean definition; |
| 3541 | bfd_boolean size_change_ok; |
| 3542 | bfd_boolean type_change_ok; |
| 3543 | bfd_boolean new_weakdef; |
| 3544 | bfd_boolean override; |
| 3545 | bfd_boolean common; |
| 3546 | unsigned int old_alignment; |
| 3547 | bfd *old_bfd; |
| 3548 | |
| 3549 | override = FALSE; |
| 3550 | |
| 3551 | flags = BSF_NO_FLAGS; |
| 3552 | sec = NULL; |
| 3553 | value = isym->st_value; |
| 3554 | *sym_hash = NULL; |
| 3555 | common = bed->common_definition (isym); |
| 3556 | |
| 3557 | bind = ELF_ST_BIND (isym->st_info); |
| 3558 | if (bind == STB_LOCAL) |
| 3559 | { |
| 3560 | /* This should be impossible, since ELF requires that all |
| 3561 | global symbols follow all local symbols, and that sh_info |
| 3562 | point to the first global symbol. Unfortunately, Irix 5 |
| 3563 | screws this up. */ |
| 3564 | continue; |
| 3565 | } |
| 3566 | else if (bind == STB_GLOBAL) |
| 3567 | { |
| 3568 | if (isym->st_shndx != SHN_UNDEF && !common) |
| 3569 | flags = BSF_GLOBAL; |
| 3570 | } |
| 3571 | else if (bind == STB_WEAK) |
| 3572 | flags = BSF_WEAK; |
| 3573 | else |
| 3574 | { |
| 3575 | /* Leave it up to the processor backend. */ |
| 3576 | } |
| 3577 | |
| 3578 | if (isym->st_shndx == SHN_UNDEF) |
| 3579 | sec = bfd_und_section_ptr; |
| 3580 | else if (isym->st_shndx < SHN_LORESERVE |
| 3581 | || isym->st_shndx > SHN_HIRESERVE) |
| 3582 | { |
| 3583 | sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 3584 | if (sec == NULL) |
| 3585 | sec = bfd_abs_section_ptr; |
| 3586 | else if (sec->kept_section) |
| 3587 | { |
| 3588 | /* Symbols from discarded section are undefined, and have |
| 3589 | default visibility. */ |
| 3590 | sec = bfd_und_section_ptr; |
| 3591 | isym->st_shndx = SHN_UNDEF; |
| 3592 | isym->st_other = (STV_DEFAULT |
| 3593 | | (isym->st_other & ~ ELF_ST_VISIBILITY (-1))); |
| 3594 | } |
| 3595 | else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) |
| 3596 | value -= sec->vma; |
| 3597 | } |
| 3598 | else if (isym->st_shndx == SHN_ABS) |
| 3599 | sec = bfd_abs_section_ptr; |
| 3600 | else if (isym->st_shndx == SHN_COMMON) |
| 3601 | { |
| 3602 | sec = bfd_com_section_ptr; |
| 3603 | /* What ELF calls the size we call the value. What ELF |
| 3604 | calls the value we call the alignment. */ |
| 3605 | value = isym->st_size; |
| 3606 | } |
| 3607 | else |
| 3608 | { |
| 3609 | /* Leave it up to the processor backend. */ |
| 3610 | } |
| 3611 | |
| 3612 | name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, |
| 3613 | isym->st_name); |
| 3614 | if (name == NULL) |
| 3615 | goto error_free_vers; |
| 3616 | |
| 3617 | if (isym->st_shndx == SHN_COMMON |
| 3618 | && ELF_ST_TYPE (isym->st_info) == STT_TLS) |
| 3619 | { |
| 3620 | asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon"); |
| 3621 | |
| 3622 | if (tcomm == NULL) |
| 3623 | { |
| 3624 | tcomm = bfd_make_section_with_flags (abfd, ".tcommon", |
| 3625 | (SEC_ALLOC |
| 3626 | | SEC_IS_COMMON |
| 3627 | | SEC_LINKER_CREATED |
| 3628 | | SEC_THREAD_LOCAL)); |
| 3629 | if (tcomm == NULL) |
| 3630 | goto error_free_vers; |
| 3631 | } |
| 3632 | sec = tcomm; |
| 3633 | } |
| 3634 | else if (bed->elf_add_symbol_hook) |
| 3635 | { |
| 3636 | if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags, |
| 3637 | &sec, &value)) |
| 3638 | goto error_free_vers; |
| 3639 | |
| 3640 | /* The hook function sets the name to NULL if this symbol |
| 3641 | should be skipped for some reason. */ |
| 3642 | if (name == NULL) |
| 3643 | continue; |
| 3644 | } |
| 3645 | |
| 3646 | /* Sanity check that all possibilities were handled. */ |
| 3647 | if (sec == NULL) |
| 3648 | { |
| 3649 | bfd_set_error (bfd_error_bad_value); |
| 3650 | goto error_free_vers; |
| 3651 | } |
| 3652 | |
| 3653 | if (bfd_is_und_section (sec) |
| 3654 | || bfd_is_com_section (sec)) |
| 3655 | definition = FALSE; |
| 3656 | else |
| 3657 | definition = TRUE; |
| 3658 | |
| 3659 | size_change_ok = FALSE; |
| 3660 | type_change_ok = bed->type_change_ok; |
| 3661 | old_alignment = 0; |
| 3662 | old_bfd = NULL; |
| 3663 | new_sec = sec; |
| 3664 | |
| 3665 | if (is_elf_hash_table (htab)) |
| 3666 | { |
| 3667 | Elf_Internal_Versym iver; |
| 3668 | unsigned int vernum = 0; |
| 3669 | bfd_boolean skip; |
| 3670 | |
| 3671 | if (ever == NULL) |
| 3672 | { |
| 3673 | if (info->default_imported_symver) |
| 3674 | /* Use the default symbol version created earlier. */ |
| 3675 | iver.vs_vers = elf_tdata (abfd)->cverdefs; |
| 3676 | else |
| 3677 | iver.vs_vers = 0; |
| 3678 | } |
| 3679 | else |
| 3680 | _bfd_elf_swap_versym_in (abfd, ever, &iver); |
| 3681 | |
| 3682 | vernum = iver.vs_vers & VERSYM_VERSION; |
| 3683 | |
| 3684 | /* If this is a hidden symbol, or if it is not version |
| 3685 | 1, we append the version name to the symbol name. |
| 3686 | However, we do not modify a non-hidden absolute symbol |
| 3687 | if it is not a function, because it might be the version |
| 3688 | symbol itself. FIXME: What if it isn't? */ |
| 3689 | if ((iver.vs_vers & VERSYM_HIDDEN) != 0 |
| 3690 | || (vernum > 1 && (! bfd_is_abs_section (sec) |
| 3691 | || ELF_ST_TYPE (isym->st_info) == STT_FUNC))) |
| 3692 | { |
| 3693 | const char *verstr; |
| 3694 | size_t namelen, verlen, newlen; |
| 3695 | char *newname, *p; |
| 3696 | |
| 3697 | if (isym->st_shndx != SHN_UNDEF) |
| 3698 | { |
| 3699 | if (vernum > elf_tdata (abfd)->cverdefs) |
| 3700 | verstr = NULL; |
| 3701 | else if (vernum > 1) |
| 3702 | verstr = |
| 3703 | elf_tdata (abfd)->verdef[vernum - 1].vd_nodename; |
| 3704 | else |
| 3705 | verstr = ""; |
| 3706 | |
| 3707 | if (verstr == NULL) |
| 3708 | { |
| 3709 | (*_bfd_error_handler) |
| 3710 | (_("%B: %s: invalid version %u (max %d)"), |
| 3711 | abfd, name, vernum, |
| 3712 | elf_tdata (abfd)->cverdefs); |
| 3713 | bfd_set_error (bfd_error_bad_value); |
| 3714 | goto error_free_vers; |
| 3715 | } |
| 3716 | } |
| 3717 | else |
| 3718 | { |
| 3719 | /* We cannot simply test for the number of |
| 3720 | entries in the VERNEED section since the |
| 3721 | numbers for the needed versions do not start |
| 3722 | at 0. */ |
| 3723 | Elf_Internal_Verneed *t; |
| 3724 | |
| 3725 | verstr = NULL; |
| 3726 | for (t = elf_tdata (abfd)->verref; |
| 3727 | t != NULL; |
| 3728 | t = t->vn_nextref) |
| 3729 | { |
| 3730 | Elf_Internal_Vernaux *a; |
| 3731 | |
| 3732 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 3733 | { |
| 3734 | if (a->vna_other == vernum) |
| 3735 | { |
| 3736 | verstr = a->vna_nodename; |
| 3737 | break; |
| 3738 | } |
| 3739 | } |
| 3740 | if (a != NULL) |
| 3741 | break; |
| 3742 | } |
| 3743 | if (verstr == NULL) |
| 3744 | { |
| 3745 | (*_bfd_error_handler) |
| 3746 | (_("%B: %s: invalid needed version %d"), |
| 3747 | abfd, name, vernum); |
| 3748 | bfd_set_error (bfd_error_bad_value); |
| 3749 | goto error_free_vers; |
| 3750 | } |
| 3751 | } |
| 3752 | |
| 3753 | namelen = strlen (name); |
| 3754 | verlen = strlen (verstr); |
| 3755 | newlen = namelen + verlen + 2; |
| 3756 | if ((iver.vs_vers & VERSYM_HIDDEN) == 0 |
| 3757 | && isym->st_shndx != SHN_UNDEF) |
| 3758 | ++newlen; |
| 3759 | |
| 3760 | newname = bfd_hash_allocate (&htab->root.table, newlen); |
| 3761 | if (newname == NULL) |
| 3762 | goto error_free_vers; |
| 3763 | memcpy (newname, name, namelen); |
| 3764 | p = newname + namelen; |
| 3765 | *p++ = ELF_VER_CHR; |
| 3766 | /* If this is a defined non-hidden version symbol, |
| 3767 | we add another @ to the name. This indicates the |
| 3768 | default version of the symbol. */ |
| 3769 | if ((iver.vs_vers & VERSYM_HIDDEN) == 0 |
| 3770 | && isym->st_shndx != SHN_UNDEF) |
| 3771 | *p++ = ELF_VER_CHR; |
| 3772 | memcpy (p, verstr, verlen + 1); |
| 3773 | |
| 3774 | name = newname; |
| 3775 | } |
| 3776 | |
| 3777 | if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, |
| 3778 | &value, &old_alignment, |
| 3779 | sym_hash, &skip, &override, |
| 3780 | &type_change_ok, &size_change_ok)) |
| 3781 | goto error_free_vers; |
| 3782 | |
| 3783 | if (skip) |
| 3784 | continue; |
| 3785 | |
| 3786 | if (override) |
| 3787 | definition = FALSE; |
| 3788 | |
| 3789 | h = *sym_hash; |
| 3790 | while (h->root.type == bfd_link_hash_indirect |
| 3791 | || h->root.type == bfd_link_hash_warning) |
| 3792 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 3793 | |
| 3794 | /* Remember the old alignment if this is a common symbol, so |
| 3795 | that we don't reduce the alignment later on. We can't |
| 3796 | check later, because _bfd_generic_link_add_one_symbol |
| 3797 | will set a default for the alignment which we want to |
| 3798 | override. We also remember the old bfd where the existing |
| 3799 | definition comes from. */ |
| 3800 | switch (h->root.type) |
| 3801 | { |
| 3802 | default: |
| 3803 | break; |
| 3804 | |
| 3805 | case bfd_link_hash_defined: |
| 3806 | case bfd_link_hash_defweak: |
| 3807 | old_bfd = h->root.u.def.section->owner; |
| 3808 | break; |
| 3809 | |
| 3810 | case bfd_link_hash_common: |
| 3811 | old_bfd = h->root.u.c.p->section->owner; |
| 3812 | old_alignment = h->root.u.c.p->alignment_power; |
| 3813 | break; |
| 3814 | } |
| 3815 | |
| 3816 | if (elf_tdata (abfd)->verdef != NULL |
| 3817 | && ! override |
| 3818 | && vernum > 1 |
| 3819 | && definition) |
| 3820 | h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1]; |
| 3821 | } |
| 3822 | |
| 3823 | if (! (_bfd_generic_link_add_one_symbol |
| 3824 | (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect, |
| 3825 | (struct bfd_link_hash_entry **) sym_hash))) |
| 3826 | goto error_free_vers; |
| 3827 | |
| 3828 | h = *sym_hash; |
| 3829 | while (h->root.type == bfd_link_hash_indirect |
| 3830 | || h->root.type == bfd_link_hash_warning) |
| 3831 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 3832 | *sym_hash = h; |
| 3833 | |
| 3834 | new_weakdef = FALSE; |
| 3835 | if (dynamic |
| 3836 | && definition |
| 3837 | && (flags & BSF_WEAK) != 0 |
| 3838 | && ELF_ST_TYPE (isym->st_info) != STT_FUNC |
| 3839 | && is_elf_hash_table (htab) |
| 3840 | && h->u.weakdef == NULL) |
| 3841 | { |
| 3842 | /* Keep a list of all weak defined non function symbols from |
| 3843 | a dynamic object, using the weakdef field. Later in this |
| 3844 | function we will set the weakdef field to the correct |
| 3845 | value. We only put non-function symbols from dynamic |
| 3846 | objects on this list, because that happens to be the only |
| 3847 | time we need to know the normal symbol corresponding to a |
| 3848 | weak symbol, and the information is time consuming to |
| 3849 | figure out. If the weakdef field is not already NULL, |
| 3850 | then this symbol was already defined by some previous |
| 3851 | dynamic object, and we will be using that previous |
| 3852 | definition anyhow. */ |
| 3853 | |
| 3854 | h->u.weakdef = weaks; |
| 3855 | weaks = h; |
| 3856 | new_weakdef = TRUE; |
| 3857 | } |
| 3858 | |
| 3859 | /* Set the alignment of a common symbol. */ |
| 3860 | if ((common || bfd_is_com_section (sec)) |
| 3861 | && h->root.type == bfd_link_hash_common) |
| 3862 | { |
| 3863 | unsigned int align; |
| 3864 | |
| 3865 | if (common) |
| 3866 | align = bfd_log2 (isym->st_value); |
| 3867 | else |
| 3868 | { |
| 3869 | /* The new symbol is a common symbol in a shared object. |
| 3870 | We need to get the alignment from the section. */ |
| 3871 | align = new_sec->alignment_power; |
| 3872 | } |
| 3873 | if (align > old_alignment |
| 3874 | /* Permit an alignment power of zero if an alignment of one |
| 3875 | is specified and no other alignments have been specified. */ |
| 3876 | || (isym->st_value == 1 && old_alignment == 0)) |
| 3877 | h->root.u.c.p->alignment_power = align; |
| 3878 | else |
| 3879 | h->root.u.c.p->alignment_power = old_alignment; |
| 3880 | } |
| 3881 | |
| 3882 | if (is_elf_hash_table (htab)) |
| 3883 | { |
| 3884 | bfd_boolean dynsym; |
| 3885 | |
| 3886 | /* Check the alignment when a common symbol is involved. This |
| 3887 | can change when a common symbol is overridden by a normal |
| 3888 | definition or a common symbol is ignored due to the old |
| 3889 | normal definition. We need to make sure the maximum |
| 3890 | alignment is maintained. */ |
| 3891 | if ((old_alignment || common) |
| 3892 | && h->root.type != bfd_link_hash_common) |
| 3893 | { |
| 3894 | unsigned int common_align; |
| 3895 | unsigned int normal_align; |
| 3896 | unsigned int symbol_align; |
| 3897 | bfd *normal_bfd; |
| 3898 | bfd *common_bfd; |
| 3899 | |
| 3900 | symbol_align = ffs (h->root.u.def.value) - 1; |
| 3901 | if (h->root.u.def.section->owner != NULL |
| 3902 | && (h->root.u.def.section->owner->flags & DYNAMIC) == 0) |
| 3903 | { |
| 3904 | normal_align = h->root.u.def.section->alignment_power; |
| 3905 | if (normal_align > symbol_align) |
| 3906 | normal_align = symbol_align; |
| 3907 | } |
| 3908 | else |
| 3909 | normal_align = symbol_align; |
| 3910 | |
| 3911 | if (old_alignment) |
| 3912 | { |
| 3913 | common_align = old_alignment; |
| 3914 | common_bfd = old_bfd; |
| 3915 | normal_bfd = abfd; |
| 3916 | } |
| 3917 | else |
| 3918 | { |
| 3919 | common_align = bfd_log2 (isym->st_value); |
| 3920 | common_bfd = abfd; |
| 3921 | normal_bfd = old_bfd; |
| 3922 | } |
| 3923 | |
| 3924 | if (normal_align < common_align) |
| 3925 | { |
| 3926 | /* PR binutils/2735 */ |
| 3927 | if (normal_bfd == NULL) |
| 3928 | (*_bfd_error_handler) |
| 3929 | (_("Warning: alignment %u of common symbol `%s' in %B" |
| 3930 | " is greater than the alignment (%u) of its section %A"), |
| 3931 | common_bfd, h->root.u.def.section, |
| 3932 | 1 << common_align, name, 1 << normal_align); |
| 3933 | else |
| 3934 | (*_bfd_error_handler) |
| 3935 | (_("Warning: alignment %u of symbol `%s' in %B" |
| 3936 | " is smaller than %u in %B"), |
| 3937 | normal_bfd, common_bfd, |
| 3938 | 1 << normal_align, name, 1 << common_align); |
| 3939 | } |
| 3940 | } |
| 3941 | |
| 3942 | /* Remember the symbol size and type. */ |
| 3943 | if (isym->st_size != 0 |
| 3944 | && (definition || h->size == 0)) |
| 3945 | { |
| 3946 | if (h->size != 0 && h->size != isym->st_size && ! size_change_ok) |
| 3947 | (*_bfd_error_handler) |
| 3948 | (_("Warning: size of symbol `%s' changed" |
| 3949 | " from %lu in %B to %lu in %B"), |
| 3950 | old_bfd, abfd, |
| 3951 | name, (unsigned long) h->size, |
| 3952 | (unsigned long) isym->st_size); |
| 3953 | |
| 3954 | h->size = isym->st_size; |
| 3955 | } |
| 3956 | |
| 3957 | /* If this is a common symbol, then we always want H->SIZE |
| 3958 | to be the size of the common symbol. The code just above |
| 3959 | won't fix the size if a common symbol becomes larger. We |
| 3960 | don't warn about a size change here, because that is |
| 3961 | covered by --warn-common. */ |
| 3962 | if (h->root.type == bfd_link_hash_common) |
| 3963 | h->size = h->root.u.c.size; |
| 3964 | |
| 3965 | if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE |
| 3966 | && (definition || h->type == STT_NOTYPE)) |
| 3967 | { |
| 3968 | if (h->type != STT_NOTYPE |
| 3969 | && h->type != ELF_ST_TYPE (isym->st_info) |
| 3970 | && ! type_change_ok) |
| 3971 | (*_bfd_error_handler) |
| 3972 | (_("Warning: type of symbol `%s' changed" |
| 3973 | " from %d to %d in %B"), |
| 3974 | abfd, name, h->type, ELF_ST_TYPE (isym->st_info)); |
| 3975 | |
| 3976 | h->type = ELF_ST_TYPE (isym->st_info); |
| 3977 | } |
| 3978 | |
| 3979 | /* If st_other has a processor-specific meaning, specific |
| 3980 | code might be needed here. We never merge the visibility |
| 3981 | attribute with the one from a dynamic object. */ |
| 3982 | if (bed->elf_backend_merge_symbol_attribute) |
| 3983 | (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition, |
| 3984 | dynamic); |
| 3985 | |
| 3986 | /* If this symbol has default visibility and the user has requested |
| 3987 | we not re-export it, then mark it as hidden. */ |
| 3988 | if (definition && !dynamic |
| 3989 | && (abfd->no_export |
| 3990 | || (abfd->my_archive && abfd->my_archive->no_export)) |
| 3991 | && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL) |
| 3992 | isym->st_other = (STV_HIDDEN |
| 3993 | | (isym->st_other & ~ELF_ST_VISIBILITY (-1))); |
| 3994 | |
| 3995 | if (isym->st_other != 0 && !dynamic) |
| 3996 | { |
| 3997 | unsigned char hvis, symvis, other, nvis; |
| 3998 | |
| 3999 | /* Take the balance of OTHER from the definition. */ |
| 4000 | other = (definition ? isym->st_other : h->other); |
| 4001 | other &= ~ ELF_ST_VISIBILITY (-1); |
| 4002 | |
| 4003 | /* Combine visibilities, using the most constraining one. */ |
| 4004 | hvis = ELF_ST_VISIBILITY (h->other); |
| 4005 | symvis = ELF_ST_VISIBILITY (isym->st_other); |
| 4006 | if (! hvis) |
| 4007 | nvis = symvis; |
| 4008 | else if (! symvis) |
| 4009 | nvis = hvis; |
| 4010 | else |
| 4011 | nvis = hvis < symvis ? hvis : symvis; |
| 4012 | |
| 4013 | h->other = other | nvis; |
| 4014 | } |
| 4015 | |
| 4016 | /* Set a flag in the hash table entry indicating the type of |
| 4017 | reference or definition we just found. Keep a count of |
| 4018 | the number of dynamic symbols we find. A dynamic symbol |
| 4019 | is one which is referenced or defined by both a regular |
| 4020 | object and a shared object. */ |
| 4021 | dynsym = FALSE; |
| 4022 | if (! dynamic) |
| 4023 | { |
| 4024 | if (! definition) |
| 4025 | { |
| 4026 | h->ref_regular = 1; |
| 4027 | if (bind != STB_WEAK) |
| 4028 | h->ref_regular_nonweak = 1; |
| 4029 | } |
| 4030 | else |
| 4031 | h->def_regular = 1; |
| 4032 | if (! info->executable |
| 4033 | || h->def_dynamic |
| 4034 | || h->ref_dynamic) |
| 4035 | dynsym = TRUE; |
| 4036 | } |
| 4037 | else |
| 4038 | { |
| 4039 | if (! definition) |
| 4040 | h->ref_dynamic = 1; |
| 4041 | else |
| 4042 | h->def_dynamic = 1; |
| 4043 | if (h->def_regular |
| 4044 | || h->ref_regular |
| 4045 | || (h->u.weakdef != NULL |
| 4046 | && ! new_weakdef |
| 4047 | && h->u.weakdef->dynindx != -1)) |
| 4048 | dynsym = TRUE; |
| 4049 | } |
| 4050 | |
| 4051 | /* Check to see if we need to add an indirect symbol for |
| 4052 | the default name. */ |
| 4053 | if (definition || h->root.type == bfd_link_hash_common) |
| 4054 | if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym, |
| 4055 | &sec, &value, &dynsym, |
| 4056 | override)) |
| 4057 | goto error_free_vers; |
| 4058 | |
| 4059 | if (definition && !dynamic) |
| 4060 | { |
| 4061 | char *p = strchr (name, ELF_VER_CHR); |
| 4062 | if (p != NULL && p[1] != ELF_VER_CHR) |
| 4063 | { |
| 4064 | /* Queue non-default versions so that .symver x, x@FOO |
| 4065 | aliases can be checked. */ |
| 4066 | if (!nondeflt_vers) |
| 4067 | { |
| 4068 | amt = ((isymend - isym + 1) |
| 4069 | * sizeof (struct elf_link_hash_entry *)); |
| 4070 | nondeflt_vers = bfd_malloc (amt); |
| 4071 | } |
| 4072 | nondeflt_vers[nondeflt_vers_cnt++] = h; |
| 4073 | } |
| 4074 | } |
| 4075 | |
| 4076 | if (dynsym && h->dynindx == -1) |
| 4077 | { |
| 4078 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 4079 | goto error_free_vers; |
| 4080 | if (h->u.weakdef != NULL |
| 4081 | && ! new_weakdef |
| 4082 | && h->u.weakdef->dynindx == -1) |
| 4083 | { |
| 4084 | if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef)) |
| 4085 | goto error_free_vers; |
| 4086 | } |
| 4087 | } |
| 4088 | else if (dynsym && h->dynindx != -1) |
| 4089 | /* If the symbol already has a dynamic index, but |
| 4090 | visibility says it should not be visible, turn it into |
| 4091 | a local symbol. */ |
| 4092 | switch (ELF_ST_VISIBILITY (h->other)) |
| 4093 | { |
| 4094 | case STV_INTERNAL: |
| 4095 | case STV_HIDDEN: |
| 4096 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); |
| 4097 | dynsym = FALSE; |
| 4098 | break; |
| 4099 | } |
| 4100 | |
| 4101 | if (!add_needed |
| 4102 | && definition |
| 4103 | && dynsym |
| 4104 | && h->ref_regular) |
| 4105 | { |
| 4106 | int ret; |
| 4107 | const char *soname = elf_dt_name (abfd); |
| 4108 | |
| 4109 | /* A symbol from a library loaded via DT_NEEDED of some |
| 4110 | other library is referenced by a regular object. |
| 4111 | Add a DT_NEEDED entry for it. Issue an error if |
| 4112 | --no-add-needed is used. */ |
| 4113 | if ((elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0) |
| 4114 | { |
| 4115 | (*_bfd_error_handler) |
| 4116 | (_("%s: invalid DSO for symbol `%s' definition"), |
| 4117 | abfd, name); |
| 4118 | bfd_set_error (bfd_error_bad_value); |
| 4119 | goto error_free_vers; |
| 4120 | } |
| 4121 | |
| 4122 | elf_dyn_lib_class (abfd) &= ~DYN_AS_NEEDED; |
| 4123 | |
| 4124 | add_needed = TRUE; |
| 4125 | ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed); |
| 4126 | if (ret < 0) |
| 4127 | goto error_free_vers; |
| 4128 | |
| 4129 | BFD_ASSERT (ret == 0); |
| 4130 | } |
| 4131 | } |
| 4132 | } |
| 4133 | |
| 4134 | if (extversym != NULL) |
| 4135 | { |
| 4136 | free (extversym); |
| 4137 | extversym = NULL; |
| 4138 | } |
| 4139 | |
| 4140 | if (isymbuf != NULL) |
| 4141 | { |
| 4142 | free (isymbuf); |
| 4143 | isymbuf = NULL; |
| 4144 | } |
| 4145 | |
| 4146 | if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0) |
| 4147 | { |
| 4148 | unsigned int i; |
| 4149 | |
| 4150 | /* Restore the symbol table. */ |
| 4151 | old_hash = (char *) old_tab + tabsize; |
| 4152 | old_ent = (char *) old_hash + hashsize; |
| 4153 | sym_hash = elf_sym_hashes (abfd); |
| 4154 | memcpy (htab->root.table.table, old_tab, tabsize); |
| 4155 | memcpy (sym_hash, old_hash, hashsize); |
| 4156 | htab->root.undefs = old_undefs; |
| 4157 | htab->root.undefs_tail = old_undefs_tail; |
| 4158 | for (i = 0; i < htab->root.table.size; i++) |
| 4159 | { |
| 4160 | struct bfd_hash_entry *p; |
| 4161 | struct elf_link_hash_entry *h; |
| 4162 | |
| 4163 | for (p = htab->root.table.table[i]; p != NULL; p = p->next) |
| 4164 | { |
| 4165 | h = (struct elf_link_hash_entry *) p; |
| 4166 | if (h->root.type == bfd_link_hash_warning) |
| 4167 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 4168 | if (h->dynindx >= old_dynsymcount) |
| 4169 | _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index); |
| 4170 | |
| 4171 | memcpy (p, old_ent, htab->root.table.entsize); |
| 4172 | old_ent = (char *) old_ent + htab->root.table.entsize; |
| 4173 | h = (struct elf_link_hash_entry *) p; |
| 4174 | if (h->root.type == bfd_link_hash_warning) |
| 4175 | { |
| 4176 | memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize); |
| 4177 | old_ent = (char *) old_ent + htab->root.table.entsize; |
| 4178 | } |
| 4179 | } |
| 4180 | } |
| 4181 | |
| 4182 | free (old_tab); |
| 4183 | objalloc_free_block ((struct objalloc *) htab->root.table.memory, |
| 4184 | alloc_mark); |
| 4185 | if (nondeflt_vers != NULL) |
| 4186 | free (nondeflt_vers); |
| 4187 | return TRUE; |
| 4188 | } |
| 4189 | |
| 4190 | if (old_tab != NULL) |
| 4191 | { |
| 4192 | free (old_tab); |
| 4193 | old_tab = NULL; |
| 4194 | } |
| 4195 | |
| 4196 | /* Now that all the symbols from this input file are created, handle |
| 4197 | .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */ |
| 4198 | if (nondeflt_vers != NULL) |
| 4199 | { |
| 4200 | bfd_size_type cnt, symidx; |
| 4201 | |
| 4202 | for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt) |
| 4203 | { |
| 4204 | struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi; |
| 4205 | char *shortname, *p; |
| 4206 | |
| 4207 | p = strchr (h->root.root.string, ELF_VER_CHR); |
| 4208 | if (p == NULL |
| 4209 | || (h->root.type != bfd_link_hash_defined |
| 4210 | && h->root.type != bfd_link_hash_defweak)) |
| 4211 | continue; |
| 4212 | |
| 4213 | amt = p - h->root.root.string; |
| 4214 | shortname = bfd_malloc (amt + 1); |
| 4215 | memcpy (shortname, h->root.root.string, amt); |
| 4216 | shortname[amt] = '\0'; |
| 4217 | |
| 4218 | hi = (struct elf_link_hash_entry *) |
| 4219 | bfd_link_hash_lookup (&htab->root, shortname, |
| 4220 | FALSE, FALSE, FALSE); |
| 4221 | if (hi != NULL |
| 4222 | && hi->root.type == h->root.type |
| 4223 | && hi->root.u.def.value == h->root.u.def.value |
| 4224 | && hi->root.u.def.section == h->root.u.def.section) |
| 4225 | { |
| 4226 | (*bed->elf_backend_hide_symbol) (info, hi, TRUE); |
| 4227 | hi->root.type = bfd_link_hash_indirect; |
| 4228 | hi->root.u.i.link = (struct bfd_link_hash_entry *) h; |
| 4229 | (*bed->elf_backend_copy_indirect_symbol) (info, h, hi); |
| 4230 | sym_hash = elf_sym_hashes (abfd); |
| 4231 | if (sym_hash) |
| 4232 | for (symidx = 0; symidx < extsymcount; ++symidx) |
| 4233 | if (sym_hash[symidx] == hi) |
| 4234 | { |
| 4235 | sym_hash[symidx] = h; |
| 4236 | break; |
| 4237 | } |
| 4238 | } |
| 4239 | free (shortname); |
| 4240 | } |
| 4241 | free (nondeflt_vers); |
| 4242 | nondeflt_vers = NULL; |
| 4243 | } |
| 4244 | |
| 4245 | /* Now set the weakdefs field correctly for all the weak defined |
| 4246 | symbols we found. The only way to do this is to search all the |
| 4247 | symbols. Since we only need the information for non functions in |
| 4248 | dynamic objects, that's the only time we actually put anything on |
| 4249 | the list WEAKS. We need this information so that if a regular |
| 4250 | object refers to a symbol defined weakly in a dynamic object, the |
| 4251 | real symbol in the dynamic object is also put in the dynamic |
| 4252 | symbols; we also must arrange for both symbols to point to the |
| 4253 | same memory location. We could handle the general case of symbol |
| 4254 | aliasing, but a general symbol alias can only be generated in |
| 4255 | assembler code, handling it correctly would be very time |
| 4256 | consuming, and other ELF linkers don't handle general aliasing |
| 4257 | either. */ |
| 4258 | if (weaks != NULL) |
| 4259 | { |
| 4260 | struct elf_link_hash_entry **hpp; |
| 4261 | struct elf_link_hash_entry **hppend; |
| 4262 | struct elf_link_hash_entry **sorted_sym_hash; |
| 4263 | struct elf_link_hash_entry *h; |
| 4264 | size_t sym_count; |
| 4265 | |
| 4266 | /* Since we have to search the whole symbol list for each weak |
| 4267 | defined symbol, search time for N weak defined symbols will be |
| 4268 | O(N^2). Binary search will cut it down to O(NlogN). */ |
| 4269 | amt = extsymcount * sizeof (struct elf_link_hash_entry *); |
| 4270 | sorted_sym_hash = bfd_malloc (amt); |
| 4271 | if (sorted_sym_hash == NULL) |
| 4272 | goto error_return; |
| 4273 | sym_hash = sorted_sym_hash; |
| 4274 | hpp = elf_sym_hashes (abfd); |
| 4275 | hppend = hpp + extsymcount; |
| 4276 | sym_count = 0; |
| 4277 | for (; hpp < hppend; hpp++) |
| 4278 | { |
| 4279 | h = *hpp; |
| 4280 | if (h != NULL |
| 4281 | && h->root.type == bfd_link_hash_defined |
| 4282 | && h->type != STT_FUNC) |
| 4283 | { |
| 4284 | *sym_hash = h; |
| 4285 | sym_hash++; |
| 4286 | sym_count++; |
| 4287 | } |
| 4288 | } |
| 4289 | |
| 4290 | qsort (sorted_sym_hash, sym_count, |
| 4291 | sizeof (struct elf_link_hash_entry *), |
| 4292 | elf_sort_symbol); |
| 4293 | |
| 4294 | while (weaks != NULL) |
| 4295 | { |
| 4296 | struct elf_link_hash_entry *hlook; |
| 4297 | asection *slook; |
| 4298 | bfd_vma vlook; |
| 4299 | long ilook; |
| 4300 | size_t i, j, idx; |
| 4301 | |
| 4302 | hlook = weaks; |
| 4303 | weaks = hlook->u.weakdef; |
| 4304 | hlook->u.weakdef = NULL; |
| 4305 | |
| 4306 | BFD_ASSERT (hlook->root.type == bfd_link_hash_defined |
| 4307 | || hlook->root.type == bfd_link_hash_defweak |
| 4308 | || hlook->root.type == bfd_link_hash_common |
| 4309 | || hlook->root.type == bfd_link_hash_indirect); |
| 4310 | slook = hlook->root.u.def.section; |
| 4311 | vlook = hlook->root.u.def.value; |
| 4312 | |
| 4313 | ilook = -1; |
| 4314 | i = 0; |
| 4315 | j = sym_count; |
| 4316 | while (i < j) |
| 4317 | { |
| 4318 | bfd_signed_vma vdiff; |
| 4319 | idx = (i + j) / 2; |
| 4320 | h = sorted_sym_hash [idx]; |
| 4321 | vdiff = vlook - h->root.u.def.value; |
| 4322 | if (vdiff < 0) |
| 4323 | j = idx; |
| 4324 | else if (vdiff > 0) |
| 4325 | i = idx + 1; |
| 4326 | else |
| 4327 | { |
| 4328 | long sdiff = slook->id - h->root.u.def.section->id; |
| 4329 | if (sdiff < 0) |
| 4330 | j = idx; |
| 4331 | else if (sdiff > 0) |
| 4332 | i = idx + 1; |
| 4333 | else |
| 4334 | { |
| 4335 | ilook = idx; |
| 4336 | break; |
| 4337 | } |
| 4338 | } |
| 4339 | } |
| 4340 | |
| 4341 | /* We didn't find a value/section match. */ |
| 4342 | if (ilook == -1) |
| 4343 | continue; |
| 4344 | |
| 4345 | for (i = ilook; i < sym_count; i++) |
| 4346 | { |
| 4347 | h = sorted_sym_hash [i]; |
| 4348 | |
| 4349 | /* Stop if value or section doesn't match. */ |
| 4350 | if (h->root.u.def.value != vlook |
| 4351 | || h->root.u.def.section != slook) |
| 4352 | break; |
| 4353 | else if (h != hlook) |
| 4354 | { |
| 4355 | hlook->u.weakdef = h; |
| 4356 | |
| 4357 | /* If the weak definition is in the list of dynamic |
| 4358 | symbols, make sure the real definition is put |
| 4359 | there as well. */ |
| 4360 | if (hlook->dynindx != -1 && h->dynindx == -1) |
| 4361 | { |
| 4362 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 4363 | goto error_return; |
| 4364 | } |
| 4365 | |
| 4366 | /* If the real definition is in the list of dynamic |
| 4367 | symbols, make sure the weak definition is put |
| 4368 | there as well. If we don't do this, then the |
| 4369 | dynamic loader might not merge the entries for the |
| 4370 | real definition and the weak definition. */ |
| 4371 | if (h->dynindx != -1 && hlook->dynindx == -1) |
| 4372 | { |
| 4373 | if (! bfd_elf_link_record_dynamic_symbol (info, hlook)) |
| 4374 | goto error_return; |
| 4375 | } |
| 4376 | break; |
| 4377 | } |
| 4378 | } |
| 4379 | } |
| 4380 | |
| 4381 | free (sorted_sym_hash); |
| 4382 | } |
| 4383 | |
| 4384 | if (bed->check_directives) |
| 4385 | (*bed->check_directives) (abfd, info); |
| 4386 | |
| 4387 | /* If this object is the same format as the output object, and it is |
| 4388 | not a shared library, then let the backend look through the |
| 4389 | relocs. |
| 4390 | |
| 4391 | This is required to build global offset table entries and to |
| 4392 | arrange for dynamic relocs. It is not required for the |
| 4393 | particular common case of linking non PIC code, even when linking |
| 4394 | against shared libraries, but unfortunately there is no way of |
| 4395 | knowing whether an object file has been compiled PIC or not. |
| 4396 | Looking through the relocs is not particularly time consuming. |
| 4397 | The problem is that we must either (1) keep the relocs in memory, |
| 4398 | which causes the linker to require additional runtime memory or |
| 4399 | (2) read the relocs twice from the input file, which wastes time. |
| 4400 | This would be a good case for using mmap. |
| 4401 | |
| 4402 | I have no idea how to handle linking PIC code into a file of a |
| 4403 | different format. It probably can't be done. */ |
| 4404 | if (! dynamic |
| 4405 | && is_elf_hash_table (htab) |
| 4406 | && htab->root.creator == abfd->xvec |
| 4407 | && bed->check_relocs != NULL) |
| 4408 | { |
| 4409 | asection *o; |
| 4410 | |
| 4411 | for (o = abfd->sections; o != NULL; o = o->next) |
| 4412 | { |
| 4413 | Elf_Internal_Rela *internal_relocs; |
| 4414 | bfd_boolean ok; |
| 4415 | |
| 4416 | if ((o->flags & SEC_RELOC) == 0 |
| 4417 | || o->reloc_count == 0 |
| 4418 | || ((info->strip == strip_all || info->strip == strip_debugger) |
| 4419 | && (o->flags & SEC_DEBUGGING) != 0) |
| 4420 | || bfd_is_abs_section (o->output_section)) |
| 4421 | continue; |
| 4422 | |
| 4423 | internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL, |
| 4424 | info->keep_memory); |
| 4425 | if (internal_relocs == NULL) |
| 4426 | goto error_return; |
| 4427 | |
| 4428 | ok = (*bed->check_relocs) (abfd, info, o, internal_relocs); |
| 4429 | |
| 4430 | if (elf_section_data (o)->relocs != internal_relocs) |
| 4431 | free (internal_relocs); |
| 4432 | |
| 4433 | if (! ok) |
| 4434 | goto error_return; |
| 4435 | } |
| 4436 | } |
| 4437 | |
| 4438 | /* If this is a non-traditional link, try to optimize the handling |
| 4439 | of the .stab/.stabstr sections. */ |
| 4440 | if (! dynamic |
| 4441 | && ! info->traditional_format |
| 4442 | && is_elf_hash_table (htab) |
| 4443 | && (info->strip != strip_all && info->strip != strip_debugger)) |
| 4444 | { |
| 4445 | asection *stabstr; |
| 4446 | |
| 4447 | stabstr = bfd_get_section_by_name (abfd, ".stabstr"); |
| 4448 | if (stabstr != NULL) |
| 4449 | { |
| 4450 | bfd_size_type string_offset = 0; |
| 4451 | asection *stab; |
| 4452 | |
| 4453 | for (stab = abfd->sections; stab; stab = stab->next) |
| 4454 | if (strncmp (".stab", stab->name, 5) == 0 |
| 4455 | && (!stab->name[5] || |
| 4456 | (stab->name[5] == '.' && ISDIGIT (stab->name[6]))) |
| 4457 | && (stab->flags & SEC_MERGE) == 0 |
| 4458 | && !bfd_is_abs_section (stab->output_section)) |
| 4459 | { |
| 4460 | struct bfd_elf_section_data *secdata; |
| 4461 | |
| 4462 | secdata = elf_section_data (stab); |
| 4463 | if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab, |
| 4464 | stabstr, &secdata->sec_info, |
| 4465 | &string_offset)) |
| 4466 | goto error_return; |
| 4467 | if (secdata->sec_info) |
| 4468 | stab->sec_info_type = ELF_INFO_TYPE_STABS; |
| 4469 | } |
| 4470 | } |
| 4471 | } |
| 4472 | |
| 4473 | if (is_elf_hash_table (htab) && add_needed) |
| 4474 | { |
| 4475 | /* Add this bfd to the loaded list. */ |
| 4476 | struct elf_link_loaded_list *n; |
| 4477 | |
| 4478 | n = bfd_alloc (abfd, sizeof (struct elf_link_loaded_list)); |
| 4479 | if (n == NULL) |
| 4480 | goto error_return; |
| 4481 | n->abfd = abfd; |
| 4482 | n->next = htab->loaded; |
| 4483 | htab->loaded = n; |
| 4484 | } |
| 4485 | |
| 4486 | return TRUE; |
| 4487 | |
| 4488 | error_free_vers: |
| 4489 | if (old_tab != NULL) |
| 4490 | free (old_tab); |
| 4491 | if (nondeflt_vers != NULL) |
| 4492 | free (nondeflt_vers); |
| 4493 | if (extversym != NULL) |
| 4494 | free (extversym); |
| 4495 | error_free_sym: |
| 4496 | if (isymbuf != NULL) |
| 4497 | free (isymbuf); |
| 4498 | error_return: |
| 4499 | return FALSE; |
| 4500 | } |
| 4501 | |
| 4502 | /* Return the linker hash table entry of a symbol that might be |
| 4503 | satisfied by an archive symbol. Return -1 on error. */ |
| 4504 | |
| 4505 | struct elf_link_hash_entry * |
| 4506 | _bfd_elf_archive_symbol_lookup (bfd *abfd, |
| 4507 | struct bfd_link_info *info, |
| 4508 | const char *name) |
| 4509 | { |
| 4510 | struct elf_link_hash_entry *h; |
| 4511 | char *p, *copy; |
| 4512 | size_t len, first; |
| 4513 | |
| 4514 | h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE); |
| 4515 | if (h != NULL) |
| 4516 | return h; |
| 4517 | |
| 4518 | /* If this is a default version (the name contains @@), look up the |
| 4519 | symbol again with only one `@' as well as without the version. |
| 4520 | The effect is that references to the symbol with and without the |
| 4521 | version will be matched by the default symbol in the archive. */ |
| 4522 | |
| 4523 | p = strchr (name, ELF_VER_CHR); |
| 4524 | if (p == NULL || p[1] != ELF_VER_CHR) |
| 4525 | return h; |
| 4526 | |
| 4527 | /* First check with only one `@'. */ |
| 4528 | len = strlen (name); |
| 4529 | copy = bfd_alloc (abfd, len); |
| 4530 | if (copy == NULL) |
| 4531 | return (struct elf_link_hash_entry *) 0 - 1; |
| 4532 | |
| 4533 | first = p - name + 1; |
| 4534 | memcpy (copy, name, first); |
| 4535 | memcpy (copy + first, name + first + 1, len - first); |
| 4536 | |
| 4537 | h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, FALSE); |
| 4538 | if (h == NULL) |
| 4539 | { |
| 4540 | /* We also need to check references to the symbol without the |
| 4541 | version. */ |
| 4542 | copy[first - 1] = '\0'; |
| 4543 | h = elf_link_hash_lookup (elf_hash_table (info), copy, |
| 4544 | FALSE, FALSE, FALSE); |
| 4545 | } |
| 4546 | |
| 4547 | bfd_release (abfd, copy); |
| 4548 | return h; |
| 4549 | } |
| 4550 | |
| 4551 | /* Add symbols from an ELF archive file to the linker hash table. We |
| 4552 | don't use _bfd_generic_link_add_archive_symbols because of a |
| 4553 | problem which arises on UnixWare. The UnixWare libc.so is an |
| 4554 | archive which includes an entry libc.so.1 which defines a bunch of |
| 4555 | symbols. The libc.so archive also includes a number of other |
| 4556 | object files, which also define symbols, some of which are the same |
| 4557 | as those defined in libc.so.1. Correct linking requires that we |
| 4558 | consider each object file in turn, and include it if it defines any |
| 4559 | symbols we need. _bfd_generic_link_add_archive_symbols does not do |
| 4560 | this; it looks through the list of undefined symbols, and includes |
| 4561 | any object file which defines them. When this algorithm is used on |
| 4562 | UnixWare, it winds up pulling in libc.so.1 early and defining a |
| 4563 | bunch of symbols. This means that some of the other objects in the |
| 4564 | archive are not included in the link, which is incorrect since they |
| 4565 | precede libc.so.1 in the archive. |
| 4566 | |
| 4567 | Fortunately, ELF archive handling is simpler than that done by |
| 4568 | _bfd_generic_link_add_archive_symbols, which has to allow for a.out |
| 4569 | oddities. In ELF, if we find a symbol in the archive map, and the |
| 4570 | symbol is currently undefined, we know that we must pull in that |
| 4571 | object file. |
| 4572 | |
| 4573 | Unfortunately, we do have to make multiple passes over the symbol |
| 4574 | table until nothing further is resolved. */ |
| 4575 | |
| 4576 | static bfd_boolean |
| 4577 | elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info) |
| 4578 | { |
| 4579 | symindex c; |
| 4580 | bfd_boolean *defined = NULL; |
| 4581 | bfd_boolean *included = NULL; |
| 4582 | carsym *symdefs; |
| 4583 | bfd_boolean loop; |
| 4584 | bfd_size_type amt; |
| 4585 | const struct elf_backend_data *bed; |
| 4586 | struct elf_link_hash_entry * (*archive_symbol_lookup) |
| 4587 | (bfd *, struct bfd_link_info *, const char *); |
| 4588 | |
| 4589 | if (! bfd_has_map (abfd)) |
| 4590 | { |
| 4591 | /* An empty archive is a special case. */ |
| 4592 | if (bfd_openr_next_archived_file (abfd, NULL) == NULL) |
| 4593 | return TRUE; |
| 4594 | bfd_set_error (bfd_error_no_armap); |
| 4595 | return FALSE; |
| 4596 | } |
| 4597 | |
| 4598 | /* Keep track of all symbols we know to be already defined, and all |
| 4599 | files we know to be already included. This is to speed up the |
| 4600 | second and subsequent passes. */ |
| 4601 | c = bfd_ardata (abfd)->symdef_count; |
| 4602 | if (c == 0) |
| 4603 | return TRUE; |
| 4604 | amt = c; |
| 4605 | amt *= sizeof (bfd_boolean); |
| 4606 | defined = bfd_zmalloc (amt); |
| 4607 | included = bfd_zmalloc (amt); |
| 4608 | if (defined == NULL || included == NULL) |
| 4609 | goto error_return; |
| 4610 | |
| 4611 | symdefs = bfd_ardata (abfd)->symdefs; |
| 4612 | bed = get_elf_backend_data (abfd); |
| 4613 | archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup; |
| 4614 | |
| 4615 | do |
| 4616 | { |
| 4617 | file_ptr last; |
| 4618 | symindex i; |
| 4619 | carsym *symdef; |
| 4620 | carsym *symdefend; |
| 4621 | |
| 4622 | loop = FALSE; |
| 4623 | last = -1; |
| 4624 | |
| 4625 | symdef = symdefs; |
| 4626 | symdefend = symdef + c; |
| 4627 | for (i = 0; symdef < symdefend; symdef++, i++) |
| 4628 | { |
| 4629 | struct elf_link_hash_entry *h; |
| 4630 | bfd *element; |
| 4631 | struct bfd_link_hash_entry *undefs_tail; |
| 4632 | symindex mark; |
| 4633 | |
| 4634 | if (defined[i] || included[i]) |
| 4635 | continue; |
| 4636 | if (symdef->file_offset == last) |
| 4637 | { |
| 4638 | included[i] = TRUE; |
| 4639 | continue; |
| 4640 | } |
| 4641 | |
| 4642 | h = archive_symbol_lookup (abfd, info, symdef->name); |
| 4643 | if (h == (struct elf_link_hash_entry *) 0 - 1) |
| 4644 | goto error_return; |
| 4645 | |
| 4646 | if (h == NULL) |
| 4647 | continue; |
| 4648 | |
| 4649 | if (h->root.type == bfd_link_hash_common) |
| 4650 | { |
| 4651 | /* We currently have a common symbol. The archive map contains |
| 4652 | a reference to this symbol, so we may want to include it. We |
| 4653 | only want to include it however, if this archive element |
| 4654 | contains a definition of the symbol, not just another common |
| 4655 | declaration of it. |
| 4656 | |
| 4657 | Unfortunately some archivers (including GNU ar) will put |
| 4658 | declarations of common symbols into their archive maps, as |
| 4659 | well as real definitions, so we cannot just go by the archive |
| 4660 | map alone. Instead we must read in the element's symbol |
| 4661 | table and check that to see what kind of symbol definition |
| 4662 | this is. */ |
| 4663 | if (! elf_link_is_defined_archive_symbol (abfd, symdef)) |
| 4664 | continue; |
| 4665 | } |
| 4666 | else if (h->root.type != bfd_link_hash_undefined) |
| 4667 | { |
| 4668 | if (h->root.type != bfd_link_hash_undefweak) |
| 4669 | defined[i] = TRUE; |
| 4670 | continue; |
| 4671 | } |
| 4672 | |
| 4673 | /* We need to include this archive member. */ |
| 4674 | element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset); |
| 4675 | if (element == NULL) |
| 4676 | goto error_return; |
| 4677 | |
| 4678 | if (! bfd_check_format (element, bfd_object)) |
| 4679 | goto error_return; |
| 4680 | |
| 4681 | /* Doublecheck that we have not included this object |
| 4682 | already--it should be impossible, but there may be |
| 4683 | something wrong with the archive. */ |
| 4684 | if (element->archive_pass != 0) |
| 4685 | { |
| 4686 | bfd_set_error (bfd_error_bad_value); |
| 4687 | goto error_return; |
| 4688 | } |
| 4689 | element->archive_pass = 1; |
| 4690 | |
| 4691 | undefs_tail = info->hash->undefs_tail; |
| 4692 | |
| 4693 | if (! (*info->callbacks->add_archive_element) (info, element, |
| 4694 | symdef->name)) |
| 4695 | goto error_return; |
| 4696 | if (! bfd_link_add_symbols (element, info)) |
| 4697 | goto error_return; |
| 4698 | |
| 4699 | /* If there are any new undefined symbols, we need to make |
| 4700 | another pass through the archive in order to see whether |
| 4701 | they can be defined. FIXME: This isn't perfect, because |
| 4702 | common symbols wind up on undefs_tail and because an |
| 4703 | undefined symbol which is defined later on in this pass |
| 4704 | does not require another pass. This isn't a bug, but it |
| 4705 | does make the code less efficient than it could be. */ |
| 4706 | if (undefs_tail != info->hash->undefs_tail) |
| 4707 | loop = TRUE; |
| 4708 | |
| 4709 | /* Look backward to mark all symbols from this object file |
| 4710 | which we have already seen in this pass. */ |
| 4711 | mark = i; |
| 4712 | do |
| 4713 | { |
| 4714 | included[mark] = TRUE; |
| 4715 | if (mark == 0) |
| 4716 | break; |
| 4717 | --mark; |
| 4718 | } |
| 4719 | while (symdefs[mark].file_offset == symdef->file_offset); |
| 4720 | |
| 4721 | /* We mark subsequent symbols from this object file as we go |
| 4722 | on through the loop. */ |
| 4723 | last = symdef->file_offset; |
| 4724 | } |
| 4725 | } |
| 4726 | while (loop); |
| 4727 | |
| 4728 | free (defined); |
| 4729 | free (included); |
| 4730 | |
| 4731 | return TRUE; |
| 4732 | |
| 4733 | error_return: |
| 4734 | if (defined != NULL) |
| 4735 | free (defined); |
| 4736 | if (included != NULL) |
| 4737 | free (included); |
| 4738 | return FALSE; |
| 4739 | } |
| 4740 | |
| 4741 | /* Given an ELF BFD, add symbols to the global hash table as |
| 4742 | appropriate. */ |
| 4743 | |
| 4744 | bfd_boolean |
| 4745 | bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info) |
| 4746 | { |
| 4747 | switch (bfd_get_format (abfd)) |
| 4748 | { |
| 4749 | case bfd_object: |
| 4750 | return elf_link_add_object_symbols (abfd, info); |
| 4751 | case bfd_archive: |
| 4752 | return elf_link_add_archive_symbols (abfd, info); |
| 4753 | default: |
| 4754 | bfd_set_error (bfd_error_wrong_format); |
| 4755 | return FALSE; |
| 4756 | } |
| 4757 | } |
| 4758 | \f |
| 4759 | /* This function will be called though elf_link_hash_traverse to store |
| 4760 | all hash value of the exported symbols in an array. */ |
| 4761 | |
| 4762 | static bfd_boolean |
| 4763 | elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data) |
| 4764 | { |
| 4765 | unsigned long **valuep = data; |
| 4766 | const char *name; |
| 4767 | char *p; |
| 4768 | unsigned long ha; |
| 4769 | char *alc = NULL; |
| 4770 | |
| 4771 | if (h->root.type == bfd_link_hash_warning) |
| 4772 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 4773 | |
| 4774 | /* Ignore indirect symbols. These are added by the versioning code. */ |
| 4775 | if (h->dynindx == -1) |
| 4776 | return TRUE; |
| 4777 | |
| 4778 | name = h->root.root.string; |
| 4779 | p = strchr (name, ELF_VER_CHR); |
| 4780 | if (p != NULL) |
| 4781 | { |
| 4782 | alc = bfd_malloc (p - name + 1); |
| 4783 | memcpy (alc, name, p - name); |
| 4784 | alc[p - name] = '\0'; |
| 4785 | name = alc; |
| 4786 | } |
| 4787 | |
| 4788 | /* Compute the hash value. */ |
| 4789 | ha = bfd_elf_hash (name); |
| 4790 | |
| 4791 | /* Store the found hash value in the array given as the argument. */ |
| 4792 | *(*valuep)++ = ha; |
| 4793 | |
| 4794 | /* And store it in the struct so that we can put it in the hash table |
| 4795 | later. */ |
| 4796 | h->u.elf_hash_value = ha; |
| 4797 | |
| 4798 | if (alc != NULL) |
| 4799 | free (alc); |
| 4800 | |
| 4801 | return TRUE; |
| 4802 | } |
| 4803 | |
| 4804 | /* Array used to determine the number of hash table buckets to use |
| 4805 | based on the number of symbols there are. If there are fewer than |
| 4806 | 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets, |
| 4807 | fewer than 37 we use 17 buckets, and so forth. We never use more |
| 4808 | than 32771 buckets. */ |
| 4809 | |
| 4810 | static const size_t elf_buckets[] = |
| 4811 | { |
| 4812 | 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209, |
| 4813 | 16411, 32771, 0 |
| 4814 | }; |
| 4815 | |
| 4816 | /* Compute bucket count for hashing table. We do not use a static set |
| 4817 | of possible tables sizes anymore. Instead we determine for all |
| 4818 | possible reasonable sizes of the table the outcome (i.e., the |
| 4819 | number of collisions etc) and choose the best solution. The |
| 4820 | weighting functions are not too simple to allow the table to grow |
| 4821 | without bounds. Instead one of the weighting factors is the size. |
| 4822 | Therefore the result is always a good payoff between few collisions |
| 4823 | (= short chain lengths) and table size. */ |
| 4824 | static size_t |
| 4825 | compute_bucket_count (struct bfd_link_info *info) |
| 4826 | { |
| 4827 | size_t dynsymcount = elf_hash_table (info)->dynsymcount; |
| 4828 | size_t best_size = 0; |
| 4829 | unsigned long int *hashcodes; |
| 4830 | unsigned long int *hashcodesp; |
| 4831 | unsigned long int i; |
| 4832 | bfd_size_type amt; |
| 4833 | |
| 4834 | /* Compute the hash values for all exported symbols. At the same |
| 4835 | time store the values in an array so that we could use them for |
| 4836 | optimizations. */ |
| 4837 | amt = dynsymcount; |
| 4838 | amt *= sizeof (unsigned long int); |
| 4839 | hashcodes = bfd_malloc (amt); |
| 4840 | if (hashcodes == NULL) |
| 4841 | return 0; |
| 4842 | hashcodesp = hashcodes; |
| 4843 | |
| 4844 | /* Put all hash values in HASHCODES. */ |
| 4845 | elf_link_hash_traverse (elf_hash_table (info), |
| 4846 | elf_collect_hash_codes, &hashcodesp); |
| 4847 | |
| 4848 | /* We have a problem here. The following code to optimize the table |
| 4849 | size requires an integer type with more the 32 bits. If |
| 4850 | BFD_HOST_U_64_BIT is set we know about such a type. */ |
| 4851 | #ifdef BFD_HOST_U_64_BIT |
| 4852 | if (info->optimize) |
| 4853 | { |
| 4854 | unsigned long int nsyms = hashcodesp - hashcodes; |
| 4855 | size_t minsize; |
| 4856 | size_t maxsize; |
| 4857 | BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0); |
| 4858 | unsigned long int *counts ; |
| 4859 | bfd *dynobj = elf_hash_table (info)->dynobj; |
| 4860 | const struct elf_backend_data *bed = get_elf_backend_data (dynobj); |
| 4861 | |
| 4862 | /* Possible optimization parameters: if we have NSYMS symbols we say |
| 4863 | that the hashing table must at least have NSYMS/4 and at most |
| 4864 | 2*NSYMS buckets. */ |
| 4865 | minsize = nsyms / 4; |
| 4866 | if (minsize == 0) |
| 4867 | minsize = 1; |
| 4868 | best_size = maxsize = nsyms * 2; |
| 4869 | |
| 4870 | /* Create array where we count the collisions in. We must use bfd_malloc |
| 4871 | since the size could be large. */ |
| 4872 | amt = maxsize; |
| 4873 | amt *= sizeof (unsigned long int); |
| 4874 | counts = bfd_malloc (amt); |
| 4875 | if (counts == NULL) |
| 4876 | { |
| 4877 | free (hashcodes); |
| 4878 | return 0; |
| 4879 | } |
| 4880 | |
| 4881 | /* Compute the "optimal" size for the hash table. The criteria is a |
| 4882 | minimal chain length. The minor criteria is (of course) the size |
| 4883 | of the table. */ |
| 4884 | for (i = minsize; i < maxsize; ++i) |
| 4885 | { |
| 4886 | /* Walk through the array of hashcodes and count the collisions. */ |
| 4887 | BFD_HOST_U_64_BIT max; |
| 4888 | unsigned long int j; |
| 4889 | unsigned long int fact; |
| 4890 | |
| 4891 | memset (counts, '\0', i * sizeof (unsigned long int)); |
| 4892 | |
| 4893 | /* Determine how often each hash bucket is used. */ |
| 4894 | for (j = 0; j < nsyms; ++j) |
| 4895 | ++counts[hashcodes[j] % i]; |
| 4896 | |
| 4897 | /* For the weight function we need some information about the |
| 4898 | pagesize on the target. This is information need not be 100% |
| 4899 | accurate. Since this information is not available (so far) we |
| 4900 | define it here to a reasonable default value. If it is crucial |
| 4901 | to have a better value some day simply define this value. */ |
| 4902 | # ifndef BFD_TARGET_PAGESIZE |
| 4903 | # define BFD_TARGET_PAGESIZE (4096) |
| 4904 | # endif |
| 4905 | |
| 4906 | /* We in any case need 2 + NSYMS entries for the size values and |
| 4907 | the chains. */ |
| 4908 | max = (2 + nsyms) * (bed->s->arch_size / 8); |
| 4909 | |
| 4910 | # if 1 |
| 4911 | /* Variant 1: optimize for short chains. We add the squares |
| 4912 | of all the chain lengths (which favors many small chain |
| 4913 | over a few long chains). */ |
| 4914 | for (j = 0; j < i; ++j) |
| 4915 | max += counts[j] * counts[j]; |
| 4916 | |
| 4917 | /* This adds penalties for the overall size of the table. */ |
| 4918 | fact = i / (BFD_TARGET_PAGESIZE / (bed->s->arch_size / 8)) + 1; |
| 4919 | max *= fact * fact; |
| 4920 | # else |
| 4921 | /* Variant 2: Optimize a lot more for small table. Here we |
| 4922 | also add squares of the size but we also add penalties for |
| 4923 | empty slots (the +1 term). */ |
| 4924 | for (j = 0; j < i; ++j) |
| 4925 | max += (1 + counts[j]) * (1 + counts[j]); |
| 4926 | |
| 4927 | /* The overall size of the table is considered, but not as |
| 4928 | strong as in variant 1, where it is squared. */ |
| 4929 | fact = i / (BFD_TARGET_PAGESIZE / (bed->s->arch_size / 8)) + 1; |
| 4930 | max *= fact; |
| 4931 | # endif |
| 4932 | |
| 4933 | /* Compare with current best results. */ |
| 4934 | if (max < best_chlen) |
| 4935 | { |
| 4936 | best_chlen = max; |
| 4937 | best_size = i; |
| 4938 | } |
| 4939 | } |
| 4940 | |
| 4941 | free (counts); |
| 4942 | } |
| 4943 | else |
| 4944 | #endif /* defined (BFD_HOST_U_64_BIT) */ |
| 4945 | { |
| 4946 | /* This is the fallback solution if no 64bit type is available or if we |
| 4947 | are not supposed to spend much time on optimizations. We select the |
| 4948 | bucket count using a fixed set of numbers. */ |
| 4949 | for (i = 0; elf_buckets[i] != 0; i++) |
| 4950 | { |
| 4951 | best_size = elf_buckets[i]; |
| 4952 | if (dynsymcount < elf_buckets[i + 1]) |
| 4953 | break; |
| 4954 | } |
| 4955 | } |
| 4956 | |
| 4957 | /* Free the arrays we needed. */ |
| 4958 | free (hashcodes); |
| 4959 | |
| 4960 | return best_size; |
| 4961 | } |
| 4962 | |
| 4963 | /* Set up the sizes and contents of the ELF dynamic sections. This is |
| 4964 | called by the ELF linker emulation before_allocation routine. We |
| 4965 | must set the sizes of the sections before the linker sets the |
| 4966 | addresses of the various sections. */ |
| 4967 | |
| 4968 | bfd_boolean |
| 4969 | bfd_elf_size_dynamic_sections (bfd *output_bfd, |
| 4970 | const char *soname, |
| 4971 | const char *rpath, |
| 4972 | const char *filter_shlib, |
| 4973 | const char * const *auxiliary_filters, |
| 4974 | struct bfd_link_info *info, |
| 4975 | asection **sinterpptr, |
| 4976 | struct bfd_elf_version_tree *verdefs) |
| 4977 | { |
| 4978 | bfd_size_type soname_indx; |
| 4979 | bfd *dynobj; |
| 4980 | const struct elf_backend_data *bed; |
| 4981 | struct elf_assign_sym_version_info asvinfo; |
| 4982 | |
| 4983 | *sinterpptr = NULL; |
| 4984 | |
| 4985 | soname_indx = (bfd_size_type) -1; |
| 4986 | |
| 4987 | if (!is_elf_hash_table (info->hash)) |
| 4988 | return TRUE; |
| 4989 | |
| 4990 | elf_tdata (output_bfd)->relro = info->relro; |
| 4991 | if (info->execstack) |
| 4992 | elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X; |
| 4993 | else if (info->noexecstack) |
| 4994 | elf_tdata (output_bfd)->stack_flags = PF_R | PF_W; |
| 4995 | else |
| 4996 | { |
| 4997 | bfd *inputobj; |
| 4998 | asection *notesec = NULL; |
| 4999 | int exec = 0; |
| 5000 | |
| 5001 | for (inputobj = info->input_bfds; |
| 5002 | inputobj; |
| 5003 | inputobj = inputobj->link_next) |
| 5004 | { |
| 5005 | asection *s; |
| 5006 | |
| 5007 | if (inputobj->flags & (DYNAMIC | BFD_LINKER_CREATED)) |
| 5008 | continue; |
| 5009 | s = bfd_get_section_by_name (inputobj, ".note.GNU-stack"); |
| 5010 | if (s) |
| 5011 | { |
| 5012 | if (s->flags & SEC_CODE) |
| 5013 | exec = PF_X; |
| 5014 | notesec = s; |
| 5015 | } |
| 5016 | else |
| 5017 | exec = PF_X; |
| 5018 | } |
| 5019 | if (notesec) |
| 5020 | { |
| 5021 | elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | exec; |
| 5022 | if (exec && info->relocatable |
| 5023 | && notesec->output_section != bfd_abs_section_ptr) |
| 5024 | notesec->output_section->flags |= SEC_CODE; |
| 5025 | } |
| 5026 | } |
| 5027 | |
| 5028 | /* Any syms created from now on start with -1 in |
| 5029 | got.refcount/offset and plt.refcount/offset. */ |
| 5030 | elf_hash_table (info)->init_got_refcount |
| 5031 | = elf_hash_table (info)->init_got_offset; |
| 5032 | elf_hash_table (info)->init_plt_refcount |
| 5033 | = elf_hash_table (info)->init_plt_offset; |
| 5034 | |
| 5035 | /* The backend may have to create some sections regardless of whether |
| 5036 | we're dynamic or not. */ |
| 5037 | bed = get_elf_backend_data (output_bfd); |
| 5038 | if (bed->elf_backend_always_size_sections |
| 5039 | && ! (*bed->elf_backend_always_size_sections) (output_bfd, info)) |
| 5040 | return FALSE; |
| 5041 | |
| 5042 | dynobj = elf_hash_table (info)->dynobj; |
| 5043 | |
| 5044 | /* If there were no dynamic objects in the link, there is nothing to |
| 5045 | do here. */ |
| 5046 | if (dynobj == NULL) |
| 5047 | return TRUE; |
| 5048 | |
| 5049 | if (! _bfd_elf_maybe_strip_eh_frame_hdr (info)) |
| 5050 | return FALSE; |
| 5051 | |
| 5052 | if (elf_hash_table (info)->dynamic_sections_created) |
| 5053 | { |
| 5054 | struct elf_info_failed eif; |
| 5055 | struct elf_link_hash_entry *h; |
| 5056 | asection *dynstr; |
| 5057 | struct bfd_elf_version_tree *t; |
| 5058 | struct bfd_elf_version_expr *d; |
| 5059 | asection *s; |
| 5060 | bfd_boolean all_defined; |
| 5061 | |
| 5062 | *sinterpptr = bfd_get_section_by_name (dynobj, ".interp"); |
| 5063 | BFD_ASSERT (*sinterpptr != NULL || !info->executable); |
| 5064 | |
| 5065 | if (soname != NULL) |
| 5066 | { |
| 5067 | soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 5068 | soname, TRUE); |
| 5069 | if (soname_indx == (bfd_size_type) -1 |
| 5070 | || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx)) |
| 5071 | return FALSE; |
| 5072 | } |
| 5073 | |
| 5074 | if (info->symbolic) |
| 5075 | { |
| 5076 | if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0)) |
| 5077 | return FALSE; |
| 5078 | info->flags |= DF_SYMBOLIC; |
| 5079 | } |
| 5080 | |
| 5081 | if (rpath != NULL) |
| 5082 | { |
| 5083 | bfd_size_type indx; |
| 5084 | |
| 5085 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath, |
| 5086 | TRUE); |
| 5087 | if (indx == (bfd_size_type) -1 |
| 5088 | || !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx)) |
| 5089 | return FALSE; |
| 5090 | |
| 5091 | if (info->new_dtags) |
| 5092 | { |
| 5093 | _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx); |
| 5094 | if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, indx)) |
| 5095 | return FALSE; |
| 5096 | } |
| 5097 | } |
| 5098 | |
| 5099 | if (filter_shlib != NULL) |
| 5100 | { |
| 5101 | bfd_size_type indx; |
| 5102 | |
| 5103 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 5104 | filter_shlib, TRUE); |
| 5105 | if (indx == (bfd_size_type) -1 |
| 5106 | || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx)) |
| 5107 | return FALSE; |
| 5108 | } |
| 5109 | |
| 5110 | if (auxiliary_filters != NULL) |
| 5111 | { |
| 5112 | const char * const *p; |
| 5113 | |
| 5114 | for (p = auxiliary_filters; *p != NULL; p++) |
| 5115 | { |
| 5116 | bfd_size_type indx; |
| 5117 | |
| 5118 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 5119 | *p, TRUE); |
| 5120 | if (indx == (bfd_size_type) -1 |
| 5121 | || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx)) |
| 5122 | return FALSE; |
| 5123 | } |
| 5124 | } |
| 5125 | |
| 5126 | eif.info = info; |
| 5127 | eif.verdefs = verdefs; |
| 5128 | eif.failed = FALSE; |
| 5129 | |
| 5130 | /* If we are supposed to export all symbols into the dynamic symbol |
| 5131 | table (this is not the normal case), then do so. */ |
| 5132 | if (info->export_dynamic) |
| 5133 | { |
| 5134 | elf_link_hash_traverse (elf_hash_table (info), |
| 5135 | _bfd_elf_export_symbol, |
| 5136 | &eif); |
| 5137 | if (eif.failed) |
| 5138 | return FALSE; |
| 5139 | } |
| 5140 | |
| 5141 | /* Make all global versions with definition. */ |
| 5142 | for (t = verdefs; t != NULL; t = t->next) |
| 5143 | for (d = t->globals.list; d != NULL; d = d->next) |
| 5144 | if (!d->symver && d->symbol) |
| 5145 | { |
| 5146 | const char *verstr, *name; |
| 5147 | size_t namelen, verlen, newlen; |
| 5148 | char *newname, *p; |
| 5149 | struct elf_link_hash_entry *newh; |
| 5150 | |
| 5151 | name = d->symbol; |
| 5152 | namelen = strlen (name); |
| 5153 | verstr = t->name; |
| 5154 | verlen = strlen (verstr); |
| 5155 | newlen = namelen + verlen + 3; |
| 5156 | |
| 5157 | newname = bfd_malloc (newlen); |
| 5158 | if (newname == NULL) |
| 5159 | return FALSE; |
| 5160 | memcpy (newname, name, namelen); |
| 5161 | |
| 5162 | /* Check the hidden versioned definition. */ |
| 5163 | p = newname + namelen; |
| 5164 | *p++ = ELF_VER_CHR; |
| 5165 | memcpy (p, verstr, verlen + 1); |
| 5166 | newh = elf_link_hash_lookup (elf_hash_table (info), |
| 5167 | newname, FALSE, FALSE, |
| 5168 | FALSE); |
| 5169 | if (newh == NULL |
| 5170 | || (newh->root.type != bfd_link_hash_defined |
| 5171 | && newh->root.type != bfd_link_hash_defweak)) |
| 5172 | { |
| 5173 | /* Check the default versioned definition. */ |
| 5174 | *p++ = ELF_VER_CHR; |
| 5175 | memcpy (p, verstr, verlen + 1); |
| 5176 | newh = elf_link_hash_lookup (elf_hash_table (info), |
| 5177 | newname, FALSE, FALSE, |
| 5178 | FALSE); |
| 5179 | } |
| 5180 | free (newname); |
| 5181 | |
| 5182 | /* Mark this version if there is a definition and it is |
| 5183 | not defined in a shared object. */ |
| 5184 | if (newh != NULL |
| 5185 | && !newh->def_dynamic |
| 5186 | && (newh->root.type == bfd_link_hash_defined |
| 5187 | || newh->root.type == bfd_link_hash_defweak)) |
| 5188 | d->symver = 1; |
| 5189 | } |
| 5190 | |
| 5191 | /* Attach all the symbols to their version information. */ |
| 5192 | asvinfo.output_bfd = output_bfd; |
| 5193 | asvinfo.info = info; |
| 5194 | asvinfo.verdefs = verdefs; |
| 5195 | asvinfo.failed = FALSE; |
| 5196 | |
| 5197 | elf_link_hash_traverse (elf_hash_table (info), |
| 5198 | _bfd_elf_link_assign_sym_version, |
| 5199 | &asvinfo); |
| 5200 | if (asvinfo.failed) |
| 5201 | return FALSE; |
| 5202 | |
| 5203 | if (!info->allow_undefined_version) |
| 5204 | { |
| 5205 | /* Check if all global versions have a definition. */ |
| 5206 | all_defined = TRUE; |
| 5207 | for (t = verdefs; t != NULL; t = t->next) |
| 5208 | for (d = t->globals.list; d != NULL; d = d->next) |
| 5209 | if (!d->symver && !d->script) |
| 5210 | { |
| 5211 | (*_bfd_error_handler) |
| 5212 | (_("%s: undefined version: %s"), |
| 5213 | d->pattern, t->name); |
| 5214 | all_defined = FALSE; |
| 5215 | } |
| 5216 | |
| 5217 | if (!all_defined) |
| 5218 | { |
| 5219 | bfd_set_error (bfd_error_bad_value); |
| 5220 | return FALSE; |
| 5221 | } |
| 5222 | } |
| 5223 | |
| 5224 | /* Find all symbols which were defined in a dynamic object and make |
| 5225 | the backend pick a reasonable value for them. */ |
| 5226 | elf_link_hash_traverse (elf_hash_table (info), |
| 5227 | _bfd_elf_adjust_dynamic_symbol, |
| 5228 | &eif); |
| 5229 | if (eif.failed) |
| 5230 | return FALSE; |
| 5231 | |
| 5232 | /* Add some entries to the .dynamic section. We fill in some of the |
| 5233 | values later, in bfd_elf_final_link, but we must add the entries |
| 5234 | now so that we know the final size of the .dynamic section. */ |
| 5235 | |
| 5236 | /* If there are initialization and/or finalization functions to |
| 5237 | call then add the corresponding DT_INIT/DT_FINI entries. */ |
| 5238 | h = (info->init_function |
| 5239 | ? elf_link_hash_lookup (elf_hash_table (info), |
| 5240 | info->init_function, FALSE, |
| 5241 | FALSE, FALSE) |
| 5242 | : NULL); |
| 5243 | if (h != NULL |
| 5244 | && (h->ref_regular |
| 5245 | || h->def_regular)) |
| 5246 | { |
| 5247 | if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0)) |
| 5248 | return FALSE; |
| 5249 | } |
| 5250 | h = (info->fini_function |
| 5251 | ? elf_link_hash_lookup (elf_hash_table (info), |
| 5252 | info->fini_function, FALSE, |
| 5253 | FALSE, FALSE) |
| 5254 | : NULL); |
| 5255 | if (h != NULL |
| 5256 | && (h->ref_regular |
| 5257 | || h->def_regular)) |
| 5258 | { |
| 5259 | if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0)) |
| 5260 | return FALSE; |
| 5261 | } |
| 5262 | |
| 5263 | s = bfd_get_section_by_name (output_bfd, ".preinit_array"); |
| 5264 | if (s != NULL && s->linker_has_input) |
| 5265 | { |
| 5266 | /* DT_PREINIT_ARRAY is not allowed in shared library. */ |
| 5267 | if (! info->executable) |
| 5268 | { |
| 5269 | bfd *sub; |
| 5270 | asection *o; |
| 5271 | |
| 5272 | for (sub = info->input_bfds; sub != NULL; |
| 5273 | sub = sub->link_next) |
| 5274 | for (o = sub->sections; o != NULL; o = o->next) |
| 5275 | if (elf_section_data (o)->this_hdr.sh_type |
| 5276 | == SHT_PREINIT_ARRAY) |
| 5277 | { |
| 5278 | (*_bfd_error_handler) |
| 5279 | (_("%B: .preinit_array section is not allowed in DSO"), |
| 5280 | sub); |
| 5281 | break; |
| 5282 | } |
| 5283 | |
| 5284 | bfd_set_error (bfd_error_nonrepresentable_section); |
| 5285 | return FALSE; |
| 5286 | } |
| 5287 | |
| 5288 | if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0) |
| 5289 | || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0)) |
| 5290 | return FALSE; |
| 5291 | } |
| 5292 | s = bfd_get_section_by_name (output_bfd, ".init_array"); |
| 5293 | if (s != NULL && s->linker_has_input) |
| 5294 | { |
| 5295 | if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0) |
| 5296 | || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0)) |
| 5297 | return FALSE; |
| 5298 | } |
| 5299 | s = bfd_get_section_by_name (output_bfd, ".fini_array"); |
| 5300 | if (s != NULL && s->linker_has_input) |
| 5301 | { |
| 5302 | if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0) |
| 5303 | || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0)) |
| 5304 | return FALSE; |
| 5305 | } |
| 5306 | |
| 5307 | dynstr = bfd_get_section_by_name (dynobj, ".dynstr"); |
| 5308 | /* If .dynstr is excluded from the link, we don't want any of |
| 5309 | these tags. Strictly, we should be checking each section |
| 5310 | individually; This quick check covers for the case where |
| 5311 | someone does a /DISCARD/ : { *(*) }. */ |
| 5312 | if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr) |
| 5313 | { |
| 5314 | bfd_size_type strsize; |
| 5315 | |
| 5316 | strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr); |
| 5317 | if (!_bfd_elf_add_dynamic_entry (info, DT_HASH, 0) |
| 5318 | || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0) |
| 5319 | || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0) |
| 5320 | || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize) |
| 5321 | || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT, |
| 5322 | bed->s->sizeof_sym)) |
| 5323 | return FALSE; |
| 5324 | } |
| 5325 | } |
| 5326 | |
| 5327 | /* The backend must work out the sizes of all the other dynamic |
| 5328 | sections. */ |
| 5329 | if (bed->elf_backend_size_dynamic_sections |
| 5330 | && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info)) |
| 5331 | return FALSE; |
| 5332 | |
| 5333 | if (elf_hash_table (info)->dynamic_sections_created) |
| 5334 | { |
| 5335 | unsigned long section_sym_count; |
| 5336 | asection *s; |
| 5337 | |
| 5338 | /* Set up the version definition section. */ |
| 5339 | s = bfd_get_section_by_name (dynobj, ".gnu.version_d"); |
| 5340 | BFD_ASSERT (s != NULL); |
| 5341 | |
| 5342 | /* We may have created additional version definitions if we are |
| 5343 | just linking a regular application. */ |
| 5344 | verdefs = asvinfo.verdefs; |
| 5345 | |
| 5346 | /* Skip anonymous version tag. */ |
| 5347 | if (verdefs != NULL && verdefs->vernum == 0) |
| 5348 | verdefs = verdefs->next; |
| 5349 | |
| 5350 | if (verdefs == NULL && !info->create_default_symver) |
| 5351 | s->flags |= SEC_EXCLUDE; |
| 5352 | else |
| 5353 | { |
| 5354 | unsigned int cdefs; |
| 5355 | bfd_size_type size; |
| 5356 | struct bfd_elf_version_tree *t; |
| 5357 | bfd_byte *p; |
| 5358 | Elf_Internal_Verdef def; |
| 5359 | Elf_Internal_Verdaux defaux; |
| 5360 | struct bfd_link_hash_entry *bh; |
| 5361 | struct elf_link_hash_entry *h; |
| 5362 | const char *name; |
| 5363 | |
| 5364 | cdefs = 0; |
| 5365 | size = 0; |
| 5366 | |
| 5367 | /* Make space for the base version. */ |
| 5368 | size += sizeof (Elf_External_Verdef); |
| 5369 | size += sizeof (Elf_External_Verdaux); |
| 5370 | ++cdefs; |
| 5371 | |
| 5372 | /* Make space for the default version. */ |
| 5373 | if (info->create_default_symver) |
| 5374 | { |
| 5375 | size += sizeof (Elf_External_Verdef); |
| 5376 | ++cdefs; |
| 5377 | } |
| 5378 | |
| 5379 | for (t = verdefs; t != NULL; t = t->next) |
| 5380 | { |
| 5381 | struct bfd_elf_version_deps *n; |
| 5382 | |
| 5383 | size += sizeof (Elf_External_Verdef); |
| 5384 | size += sizeof (Elf_External_Verdaux); |
| 5385 | ++cdefs; |
| 5386 | |
| 5387 | for (n = t->deps; n != NULL; n = n->next) |
| 5388 | size += sizeof (Elf_External_Verdaux); |
| 5389 | } |
| 5390 | |
| 5391 | s->size = size; |
| 5392 | s->contents = bfd_alloc (output_bfd, s->size); |
| 5393 | if (s->contents == NULL && s->size != 0) |
| 5394 | return FALSE; |
| 5395 | |
| 5396 | /* Fill in the version definition section. */ |
| 5397 | |
| 5398 | p = s->contents; |
| 5399 | |
| 5400 | def.vd_version = VER_DEF_CURRENT; |
| 5401 | def.vd_flags = VER_FLG_BASE; |
| 5402 | def.vd_ndx = 1; |
| 5403 | def.vd_cnt = 1; |
| 5404 | if (info->create_default_symver) |
| 5405 | { |
| 5406 | def.vd_aux = 2 * sizeof (Elf_External_Verdef); |
| 5407 | def.vd_next = sizeof (Elf_External_Verdef); |
| 5408 | } |
| 5409 | else |
| 5410 | { |
| 5411 | def.vd_aux = sizeof (Elf_External_Verdef); |
| 5412 | def.vd_next = (sizeof (Elf_External_Verdef) |
| 5413 | + sizeof (Elf_External_Verdaux)); |
| 5414 | } |
| 5415 | |
| 5416 | if (soname_indx != (bfd_size_type) -1) |
| 5417 | { |
| 5418 | _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, |
| 5419 | soname_indx); |
| 5420 | def.vd_hash = bfd_elf_hash (soname); |
| 5421 | defaux.vda_name = soname_indx; |
| 5422 | name = soname; |
| 5423 | } |
| 5424 | else |
| 5425 | { |
| 5426 | bfd_size_type indx; |
| 5427 | |
| 5428 | name = lbasename (output_bfd->filename); |
| 5429 | def.vd_hash = bfd_elf_hash (name); |
| 5430 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 5431 | name, FALSE); |
| 5432 | if (indx == (bfd_size_type) -1) |
| 5433 | return FALSE; |
| 5434 | defaux.vda_name = indx; |
| 5435 | } |
| 5436 | defaux.vda_next = 0; |
| 5437 | |
| 5438 | _bfd_elf_swap_verdef_out (output_bfd, &def, |
| 5439 | (Elf_External_Verdef *) p); |
| 5440 | p += sizeof (Elf_External_Verdef); |
| 5441 | if (info->create_default_symver) |
| 5442 | { |
| 5443 | /* Add a symbol representing this version. */ |
| 5444 | bh = NULL; |
| 5445 | if (! (_bfd_generic_link_add_one_symbol |
| 5446 | (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr, |
| 5447 | 0, NULL, FALSE, |
| 5448 | get_elf_backend_data (dynobj)->collect, &bh))) |
| 5449 | return FALSE; |
| 5450 | h = (struct elf_link_hash_entry *) bh; |
| 5451 | h->non_elf = 0; |
| 5452 | h->def_regular = 1; |
| 5453 | h->type = STT_OBJECT; |
| 5454 | h->verinfo.vertree = NULL; |
| 5455 | |
| 5456 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 5457 | return FALSE; |
| 5458 | |
| 5459 | /* Create a duplicate of the base version with the same |
| 5460 | aux block, but different flags. */ |
| 5461 | def.vd_flags = 0; |
| 5462 | def.vd_ndx = 2; |
| 5463 | def.vd_aux = sizeof (Elf_External_Verdef); |
| 5464 | if (verdefs) |
| 5465 | def.vd_next = (sizeof (Elf_External_Verdef) |
| 5466 | + sizeof (Elf_External_Verdaux)); |
| 5467 | else |
| 5468 | def.vd_next = 0; |
| 5469 | _bfd_elf_swap_verdef_out (output_bfd, &def, |
| 5470 | (Elf_External_Verdef *) p); |
| 5471 | p += sizeof (Elf_External_Verdef); |
| 5472 | } |
| 5473 | _bfd_elf_swap_verdaux_out (output_bfd, &defaux, |
| 5474 | (Elf_External_Verdaux *) p); |
| 5475 | p += sizeof (Elf_External_Verdaux); |
| 5476 | |
| 5477 | for (t = verdefs; t != NULL; t = t->next) |
| 5478 | { |
| 5479 | unsigned int cdeps; |
| 5480 | struct bfd_elf_version_deps *n; |
| 5481 | |
| 5482 | cdeps = 0; |
| 5483 | for (n = t->deps; n != NULL; n = n->next) |
| 5484 | ++cdeps; |
| 5485 | |
| 5486 | /* Add a symbol representing this version. */ |
| 5487 | bh = NULL; |
| 5488 | if (! (_bfd_generic_link_add_one_symbol |
| 5489 | (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr, |
| 5490 | 0, NULL, FALSE, |
| 5491 | get_elf_backend_data (dynobj)->collect, &bh))) |
| 5492 | return FALSE; |
| 5493 | h = (struct elf_link_hash_entry *) bh; |
| 5494 | h->non_elf = 0; |
| 5495 | h->def_regular = 1; |
| 5496 | h->type = STT_OBJECT; |
| 5497 | h->verinfo.vertree = t; |
| 5498 | |
| 5499 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 5500 | return FALSE; |
| 5501 | |
| 5502 | def.vd_version = VER_DEF_CURRENT; |
| 5503 | def.vd_flags = 0; |
| 5504 | if (t->globals.list == NULL |
| 5505 | && t->locals.list == NULL |
| 5506 | && ! t->used) |
| 5507 | def.vd_flags |= VER_FLG_WEAK; |
| 5508 | def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1); |
| 5509 | def.vd_cnt = cdeps + 1; |
| 5510 | def.vd_hash = bfd_elf_hash (t->name); |
| 5511 | def.vd_aux = sizeof (Elf_External_Verdef); |
| 5512 | def.vd_next = 0; |
| 5513 | if (t->next != NULL) |
| 5514 | def.vd_next = (sizeof (Elf_External_Verdef) |
| 5515 | + (cdeps + 1) * sizeof (Elf_External_Verdaux)); |
| 5516 | |
| 5517 | _bfd_elf_swap_verdef_out (output_bfd, &def, |
| 5518 | (Elf_External_Verdef *) p); |
| 5519 | p += sizeof (Elf_External_Verdef); |
| 5520 | |
| 5521 | defaux.vda_name = h->dynstr_index; |
| 5522 | _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, |
| 5523 | h->dynstr_index); |
| 5524 | defaux.vda_next = 0; |
| 5525 | if (t->deps != NULL) |
| 5526 | defaux.vda_next = sizeof (Elf_External_Verdaux); |
| 5527 | t->name_indx = defaux.vda_name; |
| 5528 | |
| 5529 | _bfd_elf_swap_verdaux_out (output_bfd, &defaux, |
| 5530 | (Elf_External_Verdaux *) p); |
| 5531 | p += sizeof (Elf_External_Verdaux); |
| 5532 | |
| 5533 | for (n = t->deps; n != NULL; n = n->next) |
| 5534 | { |
| 5535 | if (n->version_needed == NULL) |
| 5536 | { |
| 5537 | /* This can happen if there was an error in the |
| 5538 | version script. */ |
| 5539 | defaux.vda_name = 0; |
| 5540 | } |
| 5541 | else |
| 5542 | { |
| 5543 | defaux.vda_name = n->version_needed->name_indx; |
| 5544 | _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, |
| 5545 | defaux.vda_name); |
| 5546 | } |
| 5547 | if (n->next == NULL) |
| 5548 | defaux.vda_next = 0; |
| 5549 | else |
| 5550 | defaux.vda_next = sizeof (Elf_External_Verdaux); |
| 5551 | |
| 5552 | _bfd_elf_swap_verdaux_out (output_bfd, &defaux, |
| 5553 | (Elf_External_Verdaux *) p); |
| 5554 | p += sizeof (Elf_External_Verdaux); |
| 5555 | } |
| 5556 | } |
| 5557 | |
| 5558 | if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0) |
| 5559 | || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs)) |
| 5560 | return FALSE; |
| 5561 | |
| 5562 | elf_tdata (output_bfd)->cverdefs = cdefs; |
| 5563 | } |
| 5564 | |
| 5565 | if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS)) |
| 5566 | { |
| 5567 | if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags)) |
| 5568 | return FALSE; |
| 5569 | } |
| 5570 | else if (info->flags & DF_BIND_NOW) |
| 5571 | { |
| 5572 | if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0)) |
| 5573 | return FALSE; |
| 5574 | } |
| 5575 | |
| 5576 | if (info->flags_1) |
| 5577 | { |
| 5578 | if (info->executable) |
| 5579 | info->flags_1 &= ~ (DF_1_INITFIRST |
| 5580 | | DF_1_NODELETE |
| 5581 | | DF_1_NOOPEN); |
| 5582 | if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1)) |
| 5583 | return FALSE; |
| 5584 | } |
| 5585 | |
| 5586 | /* Work out the size of the version reference section. */ |
| 5587 | |
| 5588 | s = bfd_get_section_by_name (dynobj, ".gnu.version_r"); |
| 5589 | BFD_ASSERT (s != NULL); |
| 5590 | { |
| 5591 | struct elf_find_verdep_info sinfo; |
| 5592 | |
| 5593 | sinfo.output_bfd = output_bfd; |
| 5594 | sinfo.info = info; |
| 5595 | sinfo.vers = elf_tdata (output_bfd)->cverdefs; |
| 5596 | if (sinfo.vers == 0) |
| 5597 | sinfo.vers = 1; |
| 5598 | sinfo.failed = FALSE; |
| 5599 | |
| 5600 | elf_link_hash_traverse (elf_hash_table (info), |
| 5601 | _bfd_elf_link_find_version_dependencies, |
| 5602 | &sinfo); |
| 5603 | |
| 5604 | if (elf_tdata (output_bfd)->verref == NULL) |
| 5605 | s->flags |= SEC_EXCLUDE; |
| 5606 | else |
| 5607 | { |
| 5608 | Elf_Internal_Verneed *t; |
| 5609 | unsigned int size; |
| 5610 | unsigned int crefs; |
| 5611 | bfd_byte *p; |
| 5612 | |
| 5613 | /* Build the version definition section. */ |
| 5614 | size = 0; |
| 5615 | crefs = 0; |
| 5616 | for (t = elf_tdata (output_bfd)->verref; |
| 5617 | t != NULL; |
| 5618 | t = t->vn_nextref) |
| 5619 | { |
| 5620 | Elf_Internal_Vernaux *a; |
| 5621 | |
| 5622 | size += sizeof (Elf_External_Verneed); |
| 5623 | ++crefs; |
| 5624 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 5625 | size += sizeof (Elf_External_Vernaux); |
| 5626 | } |
| 5627 | |
| 5628 | s->size = size; |
| 5629 | s->contents = bfd_alloc (output_bfd, s->size); |
| 5630 | if (s->contents == NULL) |
| 5631 | return FALSE; |
| 5632 | |
| 5633 | p = s->contents; |
| 5634 | for (t = elf_tdata (output_bfd)->verref; |
| 5635 | t != NULL; |
| 5636 | t = t->vn_nextref) |
| 5637 | { |
| 5638 | unsigned int caux; |
| 5639 | Elf_Internal_Vernaux *a; |
| 5640 | bfd_size_type indx; |
| 5641 | |
| 5642 | caux = 0; |
| 5643 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 5644 | ++caux; |
| 5645 | |
| 5646 | t->vn_version = VER_NEED_CURRENT; |
| 5647 | t->vn_cnt = caux; |
| 5648 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 5649 | elf_dt_name (t->vn_bfd) != NULL |
| 5650 | ? elf_dt_name (t->vn_bfd) |
| 5651 | : lbasename (t->vn_bfd->filename), |
| 5652 | FALSE); |
| 5653 | if (indx == (bfd_size_type) -1) |
| 5654 | return FALSE; |
| 5655 | t->vn_file = indx; |
| 5656 | t->vn_aux = sizeof (Elf_External_Verneed); |
| 5657 | if (t->vn_nextref == NULL) |
| 5658 | t->vn_next = 0; |
| 5659 | else |
| 5660 | t->vn_next = (sizeof (Elf_External_Verneed) |
| 5661 | + caux * sizeof (Elf_External_Vernaux)); |
| 5662 | |
| 5663 | _bfd_elf_swap_verneed_out (output_bfd, t, |
| 5664 | (Elf_External_Verneed *) p); |
| 5665 | p += sizeof (Elf_External_Verneed); |
| 5666 | |
| 5667 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) |
| 5668 | { |
| 5669 | a->vna_hash = bfd_elf_hash (a->vna_nodename); |
| 5670 | indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, |
| 5671 | a->vna_nodename, FALSE); |
| 5672 | if (indx == (bfd_size_type) -1) |
| 5673 | return FALSE; |
| 5674 | a->vna_name = indx; |
| 5675 | if (a->vna_nextptr == NULL) |
| 5676 | a->vna_next = 0; |
| 5677 | else |
| 5678 | a->vna_next = sizeof (Elf_External_Vernaux); |
| 5679 | |
| 5680 | _bfd_elf_swap_vernaux_out (output_bfd, a, |
| 5681 | (Elf_External_Vernaux *) p); |
| 5682 | p += sizeof (Elf_External_Vernaux); |
| 5683 | } |
| 5684 | } |
| 5685 | |
| 5686 | if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0) |
| 5687 | || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs)) |
| 5688 | return FALSE; |
| 5689 | |
| 5690 | elf_tdata (output_bfd)->cverrefs = crefs; |
| 5691 | } |
| 5692 | } |
| 5693 | |
| 5694 | if ((elf_tdata (output_bfd)->cverrefs == 0 |
| 5695 | && elf_tdata (output_bfd)->cverdefs == 0) |
| 5696 | || _bfd_elf_link_renumber_dynsyms (output_bfd, info, |
| 5697 | §ion_sym_count) == 0) |
| 5698 | { |
| 5699 | s = bfd_get_section_by_name (dynobj, ".gnu.version"); |
| 5700 | s->flags |= SEC_EXCLUDE; |
| 5701 | } |
| 5702 | } |
| 5703 | return TRUE; |
| 5704 | } |
| 5705 | |
| 5706 | bfd_boolean |
| 5707 | bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info) |
| 5708 | { |
| 5709 | if (!is_elf_hash_table (info->hash)) |
| 5710 | return TRUE; |
| 5711 | |
| 5712 | if (elf_hash_table (info)->dynamic_sections_created) |
| 5713 | { |
| 5714 | bfd *dynobj; |
| 5715 | const struct elf_backend_data *bed; |
| 5716 | asection *s; |
| 5717 | bfd_size_type dynsymcount; |
| 5718 | unsigned long section_sym_count; |
| 5719 | size_t bucketcount = 0; |
| 5720 | size_t hash_entry_size; |
| 5721 | unsigned int dtagcount; |
| 5722 | |
| 5723 | dynobj = elf_hash_table (info)->dynobj; |
| 5724 | |
| 5725 | /* Assign dynsym indicies. In a shared library we generate a |
| 5726 | section symbol for each output section, which come first. |
| 5727 | Next come all of the back-end allocated local dynamic syms, |
| 5728 | followed by the rest of the global symbols. */ |
| 5729 | |
| 5730 | dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info, |
| 5731 | §ion_sym_count); |
| 5732 | |
| 5733 | /* Work out the size of the symbol version section. */ |
| 5734 | s = bfd_get_section_by_name (dynobj, ".gnu.version"); |
| 5735 | BFD_ASSERT (s != NULL); |
| 5736 | if (dynsymcount != 0 |
| 5737 | && (s->flags & SEC_EXCLUDE) == 0) |
| 5738 | { |
| 5739 | s->size = dynsymcount * sizeof (Elf_External_Versym); |
| 5740 | s->contents = bfd_zalloc (output_bfd, s->size); |
| 5741 | if (s->contents == NULL) |
| 5742 | return FALSE; |
| 5743 | |
| 5744 | if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0)) |
| 5745 | return FALSE; |
| 5746 | } |
| 5747 | |
| 5748 | /* Set the size of the .dynsym and .hash sections. We counted |
| 5749 | the number of dynamic symbols in elf_link_add_object_symbols. |
| 5750 | We will build the contents of .dynsym and .hash when we build |
| 5751 | the final symbol table, because until then we do not know the |
| 5752 | correct value to give the symbols. We built the .dynstr |
| 5753 | section as we went along in elf_link_add_object_symbols. */ |
| 5754 | s = bfd_get_section_by_name (dynobj, ".dynsym"); |
| 5755 | BFD_ASSERT (s != NULL); |
| 5756 | bed = get_elf_backend_data (output_bfd); |
| 5757 | s->size = dynsymcount * bed->s->sizeof_sym; |
| 5758 | |
| 5759 | if (dynsymcount != 0) |
| 5760 | { |
| 5761 | s->contents = bfd_alloc (output_bfd, s->size); |
| 5762 | if (s->contents == NULL) |
| 5763 | return FALSE; |
| 5764 | |
| 5765 | /* The first entry in .dynsym is a dummy symbol. |
| 5766 | Clear all the section syms, in case we don't output them all. */ |
| 5767 | ++section_sym_count; |
| 5768 | memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym); |
| 5769 | } |
| 5770 | |
| 5771 | /* Compute the size of the hashing table. As a side effect this |
| 5772 | computes the hash values for all the names we export. */ |
| 5773 | bucketcount = compute_bucket_count (info); |
| 5774 | |
| 5775 | s = bfd_get_section_by_name (dynobj, ".hash"); |
| 5776 | BFD_ASSERT (s != NULL); |
| 5777 | hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize; |
| 5778 | s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size); |
| 5779 | s->contents = bfd_zalloc (output_bfd, s->size); |
| 5780 | if (s->contents == NULL) |
| 5781 | return FALSE; |
| 5782 | |
| 5783 | bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents); |
| 5784 | bfd_put (8 * hash_entry_size, output_bfd, dynsymcount, |
| 5785 | s->contents + hash_entry_size); |
| 5786 | |
| 5787 | elf_hash_table (info)->bucketcount = bucketcount; |
| 5788 | |
| 5789 | s = bfd_get_section_by_name (dynobj, ".dynstr"); |
| 5790 | BFD_ASSERT (s != NULL); |
| 5791 | |
| 5792 | elf_finalize_dynstr (output_bfd, info); |
| 5793 | |
| 5794 | s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr); |
| 5795 | |
| 5796 | for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount) |
| 5797 | if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0)) |
| 5798 | return FALSE; |
| 5799 | } |
| 5800 | |
| 5801 | return TRUE; |
| 5802 | } |
| 5803 | |
| 5804 | /* Final phase of ELF linker. */ |
| 5805 | |
| 5806 | /* A structure we use to avoid passing large numbers of arguments. */ |
| 5807 | |
| 5808 | struct elf_final_link_info |
| 5809 | { |
| 5810 | /* General link information. */ |
| 5811 | struct bfd_link_info *info; |
| 5812 | /* Output BFD. */ |
| 5813 | bfd *output_bfd; |
| 5814 | /* Symbol string table. */ |
| 5815 | struct bfd_strtab_hash *symstrtab; |
| 5816 | /* .dynsym section. */ |
| 5817 | asection *dynsym_sec; |
| 5818 | /* .hash section. */ |
| 5819 | asection *hash_sec; |
| 5820 | /* symbol version section (.gnu.version). */ |
| 5821 | asection *symver_sec; |
| 5822 | /* Buffer large enough to hold contents of any section. */ |
| 5823 | bfd_byte *contents; |
| 5824 | /* Buffer large enough to hold external relocs of any section. */ |
| 5825 | void *external_relocs; |
| 5826 | /* Buffer large enough to hold internal relocs of any section. */ |
| 5827 | Elf_Internal_Rela *internal_relocs; |
| 5828 | /* Buffer large enough to hold external local symbols of any input |
| 5829 | BFD. */ |
| 5830 | bfd_byte *external_syms; |
| 5831 | /* And a buffer for symbol section indices. */ |
| 5832 | Elf_External_Sym_Shndx *locsym_shndx; |
| 5833 | /* Buffer large enough to hold internal local symbols of any input |
| 5834 | BFD. */ |
| 5835 | Elf_Internal_Sym *internal_syms; |
| 5836 | /* Array large enough to hold a symbol index for each local symbol |
| 5837 | of any input BFD. */ |
| 5838 | long *indices; |
| 5839 | /* Array large enough to hold a section pointer for each local |
| 5840 | symbol of any input BFD. */ |
| 5841 | asection **sections; |
| 5842 | /* Buffer to hold swapped out symbols. */ |
| 5843 | bfd_byte *symbuf; |
| 5844 | /* And one for symbol section indices. */ |
| 5845 | Elf_External_Sym_Shndx *symshndxbuf; |
| 5846 | /* Number of swapped out symbols in buffer. */ |
| 5847 | size_t symbuf_count; |
| 5848 | /* Number of symbols which fit in symbuf. */ |
| 5849 | size_t symbuf_size; |
| 5850 | /* And same for symshndxbuf. */ |
| 5851 | size_t shndxbuf_size; |
| 5852 | }; |
| 5853 | |
| 5854 | /* This struct is used to pass information to elf_link_output_extsym. */ |
| 5855 | |
| 5856 | struct elf_outext_info |
| 5857 | { |
| 5858 | bfd_boolean failed; |
| 5859 | bfd_boolean localsyms; |
| 5860 | struct elf_final_link_info *finfo; |
| 5861 | }; |
| 5862 | |
| 5863 | /* When performing a relocatable link, the input relocations are |
| 5864 | preserved. But, if they reference global symbols, the indices |
| 5865 | referenced must be updated. Update all the relocations in |
| 5866 | REL_HDR (there are COUNT of them), using the data in REL_HASH. */ |
| 5867 | |
| 5868 | static void |
| 5869 | elf_link_adjust_relocs (bfd *abfd, |
| 5870 | Elf_Internal_Shdr *rel_hdr, |
| 5871 | unsigned int count, |
| 5872 | struct elf_link_hash_entry **rel_hash) |
| 5873 | { |
| 5874 | unsigned int i; |
| 5875 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 5876 | bfd_byte *erela; |
| 5877 | void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *); |
| 5878 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
| 5879 | bfd_vma r_type_mask; |
| 5880 | int r_sym_shift; |
| 5881 | |
| 5882 | if (rel_hdr->sh_entsize == bed->s->sizeof_rel) |
| 5883 | { |
| 5884 | swap_in = bed->s->swap_reloc_in; |
| 5885 | swap_out = bed->s->swap_reloc_out; |
| 5886 | } |
| 5887 | else if (rel_hdr->sh_entsize == bed->s->sizeof_rela) |
| 5888 | { |
| 5889 | swap_in = bed->s->swap_reloca_in; |
| 5890 | swap_out = bed->s->swap_reloca_out; |
| 5891 | } |
| 5892 | else |
| 5893 | abort (); |
| 5894 | |
| 5895 | if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL) |
| 5896 | abort (); |
| 5897 | |
| 5898 | if (bed->s->arch_size == 32) |
| 5899 | { |
| 5900 | r_type_mask = 0xff; |
| 5901 | r_sym_shift = 8; |
| 5902 | } |
| 5903 | else |
| 5904 | { |
| 5905 | r_type_mask = 0xffffffff; |
| 5906 | r_sym_shift = 32; |
| 5907 | } |
| 5908 | |
| 5909 | erela = rel_hdr->contents; |
| 5910 | for (i = 0; i < count; i++, rel_hash++, erela += rel_hdr->sh_entsize) |
| 5911 | { |
| 5912 | Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL]; |
| 5913 | unsigned int j; |
| 5914 | |
| 5915 | if (*rel_hash == NULL) |
| 5916 | continue; |
| 5917 | |
| 5918 | BFD_ASSERT ((*rel_hash)->indx >= 0); |
| 5919 | |
| 5920 | (*swap_in) (abfd, erela, irela); |
| 5921 | for (j = 0; j < bed->s->int_rels_per_ext_rel; j++) |
| 5922 | irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift |
| 5923 | | (irela[j].r_info & r_type_mask)); |
| 5924 | (*swap_out) (abfd, irela, erela); |
| 5925 | } |
| 5926 | } |
| 5927 | |
| 5928 | struct elf_link_sort_rela |
| 5929 | { |
| 5930 | union { |
| 5931 | bfd_vma offset; |
| 5932 | bfd_vma sym_mask; |
| 5933 | } u; |
| 5934 | enum elf_reloc_type_class type; |
| 5935 | /* We use this as an array of size int_rels_per_ext_rel. */ |
| 5936 | Elf_Internal_Rela rela[1]; |
| 5937 | }; |
| 5938 | |
| 5939 | static int |
| 5940 | elf_link_sort_cmp1 (const void *A, const void *B) |
| 5941 | { |
| 5942 | const struct elf_link_sort_rela *a = A; |
| 5943 | const struct elf_link_sort_rela *b = B; |
| 5944 | int relativea, relativeb; |
| 5945 | |
| 5946 | relativea = a->type == reloc_class_relative; |
| 5947 | relativeb = b->type == reloc_class_relative; |
| 5948 | |
| 5949 | if (relativea < relativeb) |
| 5950 | return 1; |
| 5951 | if (relativea > relativeb) |
| 5952 | return -1; |
| 5953 | if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask)) |
| 5954 | return -1; |
| 5955 | if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask)) |
| 5956 | return 1; |
| 5957 | if (a->rela->r_offset < b->rela->r_offset) |
| 5958 | return -1; |
| 5959 | if (a->rela->r_offset > b->rela->r_offset) |
| 5960 | return 1; |
| 5961 | return 0; |
| 5962 | } |
| 5963 | |
| 5964 | static int |
| 5965 | elf_link_sort_cmp2 (const void *A, const void *B) |
| 5966 | { |
| 5967 | const struct elf_link_sort_rela *a = A; |
| 5968 | const struct elf_link_sort_rela *b = B; |
| 5969 | int copya, copyb; |
| 5970 | |
| 5971 | if (a->u.offset < b->u.offset) |
| 5972 | return -1; |
| 5973 | if (a->u.offset > b->u.offset) |
| 5974 | return 1; |
| 5975 | copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt); |
| 5976 | copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt); |
| 5977 | if (copya < copyb) |
| 5978 | return -1; |
| 5979 | if (copya > copyb) |
| 5980 | return 1; |
| 5981 | if (a->rela->r_offset < b->rela->r_offset) |
| 5982 | return -1; |
| 5983 | if (a->rela->r_offset > b->rela->r_offset) |
| 5984 | return 1; |
| 5985 | return 0; |
| 5986 | } |
| 5987 | |
| 5988 | static size_t |
| 5989 | elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec) |
| 5990 | { |
| 5991 | asection *reldyn; |
| 5992 | bfd_size_type count, size; |
| 5993 | size_t i, ret, sort_elt, ext_size; |
| 5994 | bfd_byte *sort, *s_non_relative, *p; |
| 5995 | struct elf_link_sort_rela *sq; |
| 5996 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 5997 | int i2e = bed->s->int_rels_per_ext_rel; |
| 5998 | void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *); |
| 5999 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
| 6000 | struct bfd_link_order *lo; |
| 6001 | bfd_vma r_sym_mask; |
| 6002 | |
| 6003 | reldyn = bfd_get_section_by_name (abfd, ".rela.dyn"); |
| 6004 | if (reldyn == NULL || reldyn->size == 0) |
| 6005 | { |
| 6006 | reldyn = bfd_get_section_by_name (abfd, ".rel.dyn"); |
| 6007 | if (reldyn == NULL || reldyn->size == 0) |
| 6008 | return 0; |
| 6009 | ext_size = bed->s->sizeof_rel; |
| 6010 | swap_in = bed->s->swap_reloc_in; |
| 6011 | swap_out = bed->s->swap_reloc_out; |
| 6012 | } |
| 6013 | else |
| 6014 | { |
| 6015 | ext_size = bed->s->sizeof_rela; |
| 6016 | swap_in = bed->s->swap_reloca_in; |
| 6017 | swap_out = bed->s->swap_reloca_out; |
| 6018 | } |
| 6019 | count = reldyn->size / ext_size; |
| 6020 | |
| 6021 | size = 0; |
| 6022 | for (lo = reldyn->map_head.link_order; lo != NULL; lo = lo->next) |
| 6023 | if (lo->type == bfd_indirect_link_order) |
| 6024 | { |
| 6025 | asection *o = lo->u.indirect.section; |
| 6026 | size += o->size; |
| 6027 | } |
| 6028 | |
| 6029 | if (size != reldyn->size) |
| 6030 | return 0; |
| 6031 | |
| 6032 | sort_elt = (sizeof (struct elf_link_sort_rela) |
| 6033 | + (i2e - 1) * sizeof (Elf_Internal_Rela)); |
| 6034 | sort = bfd_zmalloc (sort_elt * count); |
| 6035 | if (sort == NULL) |
| 6036 | { |
| 6037 | (*info->callbacks->warning) |
| 6038 | (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0); |
| 6039 | return 0; |
| 6040 | } |
| 6041 | |
| 6042 | if (bed->s->arch_size == 32) |
| 6043 | r_sym_mask = ~(bfd_vma) 0xff; |
| 6044 | else |
| 6045 | r_sym_mask = ~(bfd_vma) 0xffffffff; |
| 6046 | |
| 6047 | for (lo = reldyn->map_head.link_order; lo != NULL; lo = lo->next) |
| 6048 | if (lo->type == bfd_indirect_link_order) |
| 6049 | { |
| 6050 | bfd_byte *erel, *erelend; |
| 6051 | asection *o = lo->u.indirect.section; |
| 6052 | |
| 6053 | if (o->contents == NULL && o->size != 0) |
| 6054 | { |
| 6055 | /* This is a reloc section that is being handled as a normal |
| 6056 | section. See bfd_section_from_shdr. We can't combine |
| 6057 | relocs in this case. */ |
| 6058 | free (sort); |
| 6059 | return 0; |
| 6060 | } |
| 6061 | erel = o->contents; |
| 6062 | erelend = o->contents + o->size; |
| 6063 | p = sort + o->output_offset / ext_size * sort_elt; |
| 6064 | while (erel < erelend) |
| 6065 | { |
| 6066 | struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p; |
| 6067 | (*swap_in) (abfd, erel, s->rela); |
| 6068 | s->type = (*bed->elf_backend_reloc_type_class) (s->rela); |
| 6069 | s->u.sym_mask = r_sym_mask; |
| 6070 | p += sort_elt; |
| 6071 | erel += ext_size; |
| 6072 | } |
| 6073 | } |
| 6074 | |
| 6075 | qsort (sort, count, sort_elt, elf_link_sort_cmp1); |
| 6076 | |
| 6077 | for (i = 0, p = sort; i < count; i++, p += sort_elt) |
| 6078 | { |
| 6079 | struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p; |
| 6080 | if (s->type != reloc_class_relative) |
| 6081 | break; |
| 6082 | } |
| 6083 | ret = i; |
| 6084 | s_non_relative = p; |
| 6085 | |
| 6086 | sq = (struct elf_link_sort_rela *) s_non_relative; |
| 6087 | for (; i < count; i++, p += sort_elt) |
| 6088 | { |
| 6089 | struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p; |
| 6090 | if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0) |
| 6091 | sq = sp; |
| 6092 | sp->u.offset = sq->rela->r_offset; |
| 6093 | } |
| 6094 | |
| 6095 | qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2); |
| 6096 | |
| 6097 | for (lo = reldyn->map_head.link_order; lo != NULL; lo = lo->next) |
| 6098 | if (lo->type == bfd_indirect_link_order) |
| 6099 | { |
| 6100 | bfd_byte *erel, *erelend; |
| 6101 | asection *o = lo->u.indirect.section; |
| 6102 | |
| 6103 | erel = o->contents; |
| 6104 | erelend = o->contents + o->size; |
| 6105 | p = sort + o->output_offset / ext_size * sort_elt; |
| 6106 | while (erel < erelend) |
| 6107 | { |
| 6108 | struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p; |
| 6109 | (*swap_out) (abfd, s->rela, erel); |
| 6110 | p += sort_elt; |
| 6111 | erel += ext_size; |
| 6112 | } |
| 6113 | } |
| 6114 | |
| 6115 | free (sort); |
| 6116 | *psec = reldyn; |
| 6117 | return ret; |
| 6118 | } |
| 6119 | |
| 6120 | /* Flush the output symbols to the file. */ |
| 6121 | |
| 6122 | static bfd_boolean |
| 6123 | elf_link_flush_output_syms (struct elf_final_link_info *finfo, |
| 6124 | const struct elf_backend_data *bed) |
| 6125 | { |
| 6126 | if (finfo->symbuf_count > 0) |
| 6127 | { |
| 6128 | Elf_Internal_Shdr *hdr; |
| 6129 | file_ptr pos; |
| 6130 | bfd_size_type amt; |
| 6131 | |
| 6132 | hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr; |
| 6133 | pos = hdr->sh_offset + hdr->sh_size; |
| 6134 | amt = finfo->symbuf_count * bed->s->sizeof_sym; |
| 6135 | if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0 |
| 6136 | || bfd_bwrite (finfo->symbuf, amt, finfo->output_bfd) != amt) |
| 6137 | return FALSE; |
| 6138 | |
| 6139 | hdr->sh_size += amt; |
| 6140 | finfo->symbuf_count = 0; |
| 6141 | } |
| 6142 | |
| 6143 | return TRUE; |
| 6144 | } |
| 6145 | |
| 6146 | /* Add a symbol to the output symbol table. */ |
| 6147 | |
| 6148 | static bfd_boolean |
| 6149 | elf_link_output_sym (struct elf_final_link_info *finfo, |
| 6150 | const char *name, |
| 6151 | Elf_Internal_Sym *elfsym, |
| 6152 | asection *input_sec, |
| 6153 | struct elf_link_hash_entry *h) |
| 6154 | { |
| 6155 | bfd_byte *dest; |
| 6156 | Elf_External_Sym_Shndx *destshndx; |
| 6157 | bfd_boolean (*output_symbol_hook) |
| 6158 | (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *, |
| 6159 | struct elf_link_hash_entry *); |
| 6160 | const struct elf_backend_data *bed; |
| 6161 | |
| 6162 | bed = get_elf_backend_data (finfo->output_bfd); |
| 6163 | output_symbol_hook = bed->elf_backend_link_output_symbol_hook; |
| 6164 | if (output_symbol_hook != NULL) |
| 6165 | { |
| 6166 | if (! (*output_symbol_hook) (finfo->info, name, elfsym, input_sec, h)) |
| 6167 | return FALSE; |
| 6168 | } |
| 6169 | |
| 6170 | if (name == NULL || *name == '\0') |
| 6171 | elfsym->st_name = 0; |
| 6172 | else if (input_sec->flags & SEC_EXCLUDE) |
| 6173 | elfsym->st_name = 0; |
| 6174 | else |
| 6175 | { |
| 6176 | elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab, |
| 6177 | name, TRUE, FALSE); |
| 6178 | if (elfsym->st_name == (unsigned long) -1) |
| 6179 | return FALSE; |
| 6180 | } |
| 6181 | |
| 6182 | if (finfo->symbuf_count >= finfo->symbuf_size) |
| 6183 | { |
| 6184 | if (! elf_link_flush_output_syms (finfo, bed)) |
| 6185 | return FALSE; |
| 6186 | } |
| 6187 | |
| 6188 | dest = finfo->symbuf + finfo->symbuf_count * bed->s->sizeof_sym; |
| 6189 | destshndx = finfo->symshndxbuf; |
| 6190 | if (destshndx != NULL) |
| 6191 | { |
| 6192 | if (bfd_get_symcount (finfo->output_bfd) >= finfo->shndxbuf_size) |
| 6193 | { |
| 6194 | bfd_size_type amt; |
| 6195 | |
| 6196 | amt = finfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx); |
| 6197 | finfo->symshndxbuf = destshndx = bfd_realloc (destshndx, amt * 2); |
| 6198 | if (destshndx == NULL) |
| 6199 | return FALSE; |
| 6200 | memset ((char *) destshndx + amt, 0, amt); |
| 6201 | finfo->shndxbuf_size *= 2; |
| 6202 | } |
| 6203 | destshndx += bfd_get_symcount (finfo->output_bfd); |
| 6204 | } |
| 6205 | |
| 6206 | bed->s->swap_symbol_out (finfo->output_bfd, elfsym, dest, destshndx); |
| 6207 | finfo->symbuf_count += 1; |
| 6208 | bfd_get_symcount (finfo->output_bfd) += 1; |
| 6209 | |
| 6210 | return TRUE; |
| 6211 | } |
| 6212 | |
| 6213 | /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */ |
| 6214 | |
| 6215 | static bfd_boolean |
| 6216 | check_dynsym (bfd *abfd, Elf_Internal_Sym *sym) |
| 6217 | { |
| 6218 | if (sym->st_shndx > SHN_HIRESERVE) |
| 6219 | { |
| 6220 | /* The gABI doesn't support dynamic symbols in output sections |
| 6221 | beyond 64k. */ |
| 6222 | (*_bfd_error_handler) |
| 6223 | (_("%B: Too many sections: %d (>= %d)"), |
| 6224 | abfd, bfd_count_sections (abfd), SHN_LORESERVE); |
| 6225 | bfd_set_error (bfd_error_nonrepresentable_section); |
| 6226 | return FALSE; |
| 6227 | } |
| 6228 | return TRUE; |
| 6229 | } |
| 6230 | |
| 6231 | /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in |
| 6232 | allowing an unsatisfied unversioned symbol in the DSO to match a |
| 6233 | versioned symbol that would normally require an explicit version. |
| 6234 | We also handle the case that a DSO references a hidden symbol |
| 6235 | which may be satisfied by a versioned symbol in another DSO. */ |
| 6236 | |
| 6237 | static bfd_boolean |
| 6238 | elf_link_check_versioned_symbol (struct bfd_link_info *info, |
| 6239 | const struct elf_backend_data *bed, |
| 6240 | struct elf_link_hash_entry *h) |
| 6241 | { |
| 6242 | bfd *abfd; |
| 6243 | struct elf_link_loaded_list *loaded; |
| 6244 | |
| 6245 | if (!is_elf_hash_table (info->hash)) |
| 6246 | return FALSE; |
| 6247 | |
| 6248 | switch (h->root.type) |
| 6249 | { |
| 6250 | default: |
| 6251 | abfd = NULL; |
| 6252 | break; |
| 6253 | |
| 6254 | case bfd_link_hash_undefined: |
| 6255 | case bfd_link_hash_undefweak: |
| 6256 | abfd = h->root.u.undef.abfd; |
| 6257 | if ((abfd->flags & DYNAMIC) == 0 |
| 6258 | || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0) |
| 6259 | return FALSE; |
| 6260 | break; |
| 6261 | |
| 6262 | case bfd_link_hash_defined: |
| 6263 | case bfd_link_hash_defweak: |
| 6264 | abfd = h->root.u.def.section->owner; |
| 6265 | break; |
| 6266 | |
| 6267 | case bfd_link_hash_common: |
| 6268 | abfd = h->root.u.c.p->section->owner; |
| 6269 | break; |
| 6270 | } |
| 6271 | BFD_ASSERT (abfd != NULL); |
| 6272 | |
| 6273 | for (loaded = elf_hash_table (info)->loaded; |
| 6274 | loaded != NULL; |
| 6275 | loaded = loaded->next) |
| 6276 | { |
| 6277 | bfd *input; |
| 6278 | Elf_Internal_Shdr *hdr; |
| 6279 | bfd_size_type symcount; |
| 6280 | bfd_size_type extsymcount; |
| 6281 | bfd_size_type extsymoff; |
| 6282 | Elf_Internal_Shdr *versymhdr; |
| 6283 | Elf_Internal_Sym *isym; |
| 6284 | Elf_Internal_Sym *isymend; |
| 6285 | Elf_Internal_Sym *isymbuf; |
| 6286 | Elf_External_Versym *ever; |
| 6287 | Elf_External_Versym *extversym; |
| 6288 | |
| 6289 | input = loaded->abfd; |
| 6290 | |
| 6291 | /* We check each DSO for a possible hidden versioned definition. */ |
| 6292 | if (input == abfd |
| 6293 | || (input->flags & DYNAMIC) == 0 |
| 6294 | || elf_dynversym (input) == 0) |
| 6295 | continue; |
| 6296 | |
| 6297 | hdr = &elf_tdata (input)->dynsymtab_hdr; |
| 6298 | |
| 6299 | symcount = hdr->sh_size / bed->s->sizeof_sym; |
| 6300 | if (elf_bad_symtab (input)) |
| 6301 | { |
| 6302 | extsymcount = symcount; |
| 6303 | extsymoff = 0; |
| 6304 | } |
| 6305 | else |
| 6306 | { |
| 6307 | extsymcount = symcount - hdr->sh_info; |
| 6308 | extsymoff = hdr->sh_info; |
| 6309 | } |
| 6310 | |
| 6311 | if (extsymcount == 0) |
| 6312 | continue; |
| 6313 | |
| 6314 | isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff, |
| 6315 | NULL, NULL, NULL); |
| 6316 | if (isymbuf == NULL) |
| 6317 | return FALSE; |
| 6318 | |
| 6319 | /* Read in any version definitions. */ |
| 6320 | versymhdr = &elf_tdata (input)->dynversym_hdr; |
| 6321 | extversym = bfd_malloc (versymhdr->sh_size); |
| 6322 | if (extversym == NULL) |
| 6323 | goto error_ret; |
| 6324 | |
| 6325 | if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0 |
| 6326 | || (bfd_bread (extversym, versymhdr->sh_size, input) |
| 6327 | != versymhdr->sh_size)) |
| 6328 | { |
| 6329 | free (extversym); |
| 6330 | error_ret: |
| 6331 | free (isymbuf); |
| 6332 | return FALSE; |
| 6333 | } |
| 6334 | |
| 6335 | ever = extversym + extsymoff; |
| 6336 | isymend = isymbuf + extsymcount; |
| 6337 | for (isym = isymbuf; isym < isymend; isym++, ever++) |
| 6338 | { |
| 6339 | const char *name; |
| 6340 | Elf_Internal_Versym iver; |
| 6341 | unsigned short version_index; |
| 6342 | |
| 6343 | if (ELF_ST_BIND (isym->st_info) == STB_LOCAL |
| 6344 | || isym->st_shndx == SHN_UNDEF) |
| 6345 | continue; |
| 6346 | |
| 6347 | name = bfd_elf_string_from_elf_section (input, |
| 6348 | hdr->sh_link, |
| 6349 | isym->st_name); |
| 6350 | if (strcmp (name, h->root.root.string) != 0) |
| 6351 | continue; |
| 6352 | |
| 6353 | _bfd_elf_swap_versym_in (input, ever, &iver); |
| 6354 | |
| 6355 | if ((iver.vs_vers & VERSYM_HIDDEN) == 0) |
| 6356 | { |
| 6357 | /* If we have a non-hidden versioned sym, then it should |
| 6358 | have provided a definition for the undefined sym. */ |
| 6359 | abort (); |
| 6360 | } |
| 6361 | |
| 6362 | version_index = iver.vs_vers & VERSYM_VERSION; |
| 6363 | if (version_index == 1 || version_index == 2) |
| 6364 | { |
| 6365 | /* This is the base or first version. We can use it. */ |
| 6366 | free (extversym); |
| 6367 | free (isymbuf); |
| 6368 | return TRUE; |
| 6369 | } |
| 6370 | } |
| 6371 | |
| 6372 | free (extversym); |
| 6373 | free (isymbuf); |
| 6374 | } |
| 6375 | |
| 6376 | return FALSE; |
| 6377 | } |
| 6378 | |
| 6379 | /* Add an external symbol to the symbol table. This is called from |
| 6380 | the hash table traversal routine. When generating a shared object, |
| 6381 | we go through the symbol table twice. The first time we output |
| 6382 | anything that might have been forced to local scope in a version |
| 6383 | script. The second time we output the symbols that are still |
| 6384 | global symbols. */ |
| 6385 | |
| 6386 | static bfd_boolean |
| 6387 | elf_link_output_extsym (struct elf_link_hash_entry *h, void *data) |
| 6388 | { |
| 6389 | struct elf_outext_info *eoinfo = data; |
| 6390 | struct elf_final_link_info *finfo = eoinfo->finfo; |
| 6391 | bfd_boolean strip; |
| 6392 | Elf_Internal_Sym sym; |
| 6393 | asection *input_sec; |
| 6394 | const struct elf_backend_data *bed; |
| 6395 | |
| 6396 | if (h->root.type == bfd_link_hash_warning) |
| 6397 | { |
| 6398 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 6399 | if (h->root.type == bfd_link_hash_new) |
| 6400 | return TRUE; |
| 6401 | } |
| 6402 | |
| 6403 | /* Decide whether to output this symbol in this pass. */ |
| 6404 | if (eoinfo->localsyms) |
| 6405 | { |
| 6406 | if (!h->forced_local) |
| 6407 | return TRUE; |
| 6408 | } |
| 6409 | else |
| 6410 | { |
| 6411 | if (h->forced_local) |
| 6412 | return TRUE; |
| 6413 | } |
| 6414 | |
| 6415 | bed = get_elf_backend_data (finfo->output_bfd); |
| 6416 | |
| 6417 | if (h->root.type == bfd_link_hash_undefined) |
| 6418 | { |
| 6419 | /* If we have an undefined symbol reference here then it must have |
| 6420 | come from a shared library that is being linked in. (Undefined |
| 6421 | references in regular files have already been handled). */ |
| 6422 | bfd_boolean ignore_undef = FALSE; |
| 6423 | |
| 6424 | /* Some symbols may be special in that the fact that they're |
| 6425 | undefined can be safely ignored - let backend determine that. */ |
| 6426 | if (bed->elf_backend_ignore_undef_symbol) |
| 6427 | ignore_undef = bed->elf_backend_ignore_undef_symbol (h); |
| 6428 | |
| 6429 | /* If we are reporting errors for this situation then do so now. */ |
| 6430 | if (ignore_undef == FALSE |
| 6431 | && h->ref_dynamic |
| 6432 | && ! h->ref_regular |
| 6433 | && ! elf_link_check_versioned_symbol (finfo->info, bed, h) |
| 6434 | && finfo->info->unresolved_syms_in_shared_libs != RM_IGNORE) |
| 6435 | { |
| 6436 | if (! (finfo->info->callbacks->undefined_symbol |
| 6437 | (finfo->info, h->root.root.string, h->root.u.undef.abfd, |
| 6438 | NULL, 0, finfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR))) |
| 6439 | { |
| 6440 | eoinfo->failed = TRUE; |
| 6441 | return FALSE; |
| 6442 | } |
| 6443 | } |
| 6444 | } |
| 6445 | |
| 6446 | /* We should also warn if a forced local symbol is referenced from |
| 6447 | shared libraries. */ |
| 6448 | if (! finfo->info->relocatable |
| 6449 | && (! finfo->info->shared) |
| 6450 | && h->forced_local |
| 6451 | && h->ref_dynamic |
| 6452 | && !h->dynamic_def |
| 6453 | && !h->dynamic_weak |
| 6454 | && ! elf_link_check_versioned_symbol (finfo->info, bed, h)) |
| 6455 | { |
| 6456 | (*_bfd_error_handler) |
| 6457 | (_("%B: %s symbol `%s' in %B is referenced by DSO"), |
| 6458 | finfo->output_bfd, |
| 6459 | h->root.u.def.section == bfd_abs_section_ptr |
| 6460 | ? finfo->output_bfd : h->root.u.def.section->owner, |
| 6461 | ELF_ST_VISIBILITY (h->other) == STV_INTERNAL |
| 6462 | ? "internal" |
| 6463 | : ELF_ST_VISIBILITY (h->other) == STV_HIDDEN |
| 6464 | ? "hidden" : "local", |
| 6465 | h->root.root.string); |
| 6466 | eoinfo->failed = TRUE; |
| 6467 | return FALSE; |
| 6468 | } |
| 6469 | |
| 6470 | /* We don't want to output symbols that have never been mentioned by |
| 6471 | a regular file, or that we have been told to strip. However, if |
| 6472 | h->indx is set to -2, the symbol is used by a reloc and we must |
| 6473 | output it. */ |
| 6474 | if (h->indx == -2) |
| 6475 | strip = FALSE; |
| 6476 | else if ((h->def_dynamic |
| 6477 | || h->ref_dynamic |
| 6478 | || h->root.type == bfd_link_hash_new) |
| 6479 | && !h->def_regular |
| 6480 | && !h->ref_regular) |
| 6481 | strip = TRUE; |
| 6482 | else if (finfo->info->strip == strip_all) |
| 6483 | strip = TRUE; |
| 6484 | else if (finfo->info->strip == strip_some |
| 6485 | && bfd_hash_lookup (finfo->info->keep_hash, |
| 6486 | h->root.root.string, FALSE, FALSE) == NULL) |
| 6487 | strip = TRUE; |
| 6488 | else if (finfo->info->strip_discarded |
| 6489 | && (h->root.type == bfd_link_hash_defined |
| 6490 | || h->root.type == bfd_link_hash_defweak) |
| 6491 | && elf_discarded_section (h->root.u.def.section)) |
| 6492 | strip = TRUE; |
| 6493 | else |
| 6494 | strip = FALSE; |
| 6495 | |
| 6496 | /* If we're stripping it, and it's not a dynamic symbol, there's |
| 6497 | nothing else to do unless it is a forced local symbol. */ |
| 6498 | if (strip |
| 6499 | && h->dynindx == -1 |
| 6500 | && !h->forced_local) |
| 6501 | return TRUE; |
| 6502 | |
| 6503 | sym.st_value = 0; |
| 6504 | sym.st_size = h->size; |
| 6505 | sym.st_other = h->other; |
| 6506 | if (h->forced_local) |
| 6507 | sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type); |
| 6508 | else if (h->root.type == bfd_link_hash_undefweak |
| 6509 | || h->root.type == bfd_link_hash_defweak) |
| 6510 | sym.st_info = ELF_ST_INFO (STB_WEAK, h->type); |
| 6511 | else |
| 6512 | sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type); |
| 6513 | |
| 6514 | switch (h->root.type) |
| 6515 | { |
| 6516 | default: |
| 6517 | case bfd_link_hash_new: |
| 6518 | case bfd_link_hash_warning: |
| 6519 | abort (); |
| 6520 | return FALSE; |
| 6521 | |
| 6522 | case bfd_link_hash_undefined: |
| 6523 | case bfd_link_hash_undefweak: |
| 6524 | input_sec = bfd_und_section_ptr; |
| 6525 | sym.st_shndx = SHN_UNDEF; |
| 6526 | break; |
| 6527 | |
| 6528 | case bfd_link_hash_defined: |
| 6529 | case bfd_link_hash_defweak: |
| 6530 | { |
| 6531 | input_sec = h->root.u.def.section; |
| 6532 | if (input_sec->output_section != NULL) |
| 6533 | { |
| 6534 | sym.st_shndx = |
| 6535 | _bfd_elf_section_from_bfd_section (finfo->output_bfd, |
| 6536 | input_sec->output_section); |
| 6537 | if (sym.st_shndx == SHN_BAD) |
| 6538 | { |
| 6539 | (*_bfd_error_handler) |
| 6540 | (_("%B: could not find output section %A for input section %A"), |
| 6541 | finfo->output_bfd, input_sec->output_section, input_sec); |
| 6542 | eoinfo->failed = TRUE; |
| 6543 | return FALSE; |
| 6544 | } |
| 6545 | |
| 6546 | /* ELF symbols in relocatable files are section relative, |
| 6547 | but in nonrelocatable files they are virtual |
| 6548 | addresses. */ |
| 6549 | sym.st_value = h->root.u.def.value + input_sec->output_offset; |
| 6550 | if (! finfo->info->relocatable) |
| 6551 | { |
| 6552 | sym.st_value += input_sec->output_section->vma; |
| 6553 | if (h->type == STT_TLS) |
| 6554 | { |
| 6555 | /* STT_TLS symbols are relative to PT_TLS segment |
| 6556 | base. */ |
| 6557 | BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL); |
| 6558 | sym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma; |
| 6559 | } |
| 6560 | } |
| 6561 | } |
| 6562 | else |
| 6563 | { |
| 6564 | BFD_ASSERT (input_sec->owner == NULL |
| 6565 | || (input_sec->owner->flags & DYNAMIC) != 0); |
| 6566 | sym.st_shndx = SHN_UNDEF; |
| 6567 | input_sec = bfd_und_section_ptr; |
| 6568 | } |
| 6569 | } |
| 6570 | break; |
| 6571 | |
| 6572 | case bfd_link_hash_common: |
| 6573 | input_sec = h->root.u.c.p->section; |
| 6574 | sym.st_shndx = bed->common_section_index (input_sec); |
| 6575 | sym.st_value = 1 << h->root.u.c.p->alignment_power; |
| 6576 | break; |
| 6577 | |
| 6578 | case bfd_link_hash_indirect: |
| 6579 | /* These symbols are created by symbol versioning. They point |
| 6580 | to the decorated version of the name. For example, if the |
| 6581 | symbol foo@@GNU_1.2 is the default, which should be used when |
| 6582 | foo is used with no version, then we add an indirect symbol |
| 6583 | foo which points to foo@@GNU_1.2. We ignore these symbols, |
| 6584 | since the indirected symbol is already in the hash table. */ |
| 6585 | return TRUE; |
| 6586 | } |
| 6587 | |
| 6588 | /* Give the processor backend a chance to tweak the symbol value, |
| 6589 | and also to finish up anything that needs to be done for this |
| 6590 | symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for |
| 6591 | forced local syms when non-shared is due to a historical quirk. */ |
| 6592 | if ((h->dynindx != -1 |
| 6593 | || h->forced_local) |
| 6594 | && ((finfo->info->shared |
| 6595 | && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 6596 | || h->root.type != bfd_link_hash_undefweak)) |
| 6597 | || !h->forced_local) |
| 6598 | && elf_hash_table (finfo->info)->dynamic_sections_created) |
| 6599 | { |
| 6600 | if (! ((*bed->elf_backend_finish_dynamic_symbol) |
| 6601 | (finfo->output_bfd, finfo->info, h, &sym))) |
| 6602 | { |
| 6603 | eoinfo->failed = TRUE; |
| 6604 | return FALSE; |
| 6605 | } |
| 6606 | } |
| 6607 | |
| 6608 | /* If we are marking the symbol as undefined, and there are no |
| 6609 | non-weak references to this symbol from a regular object, then |
| 6610 | mark the symbol as weak undefined; if there are non-weak |
| 6611 | references, mark the symbol as strong. We can't do this earlier, |
| 6612 | because it might not be marked as undefined until the |
| 6613 | finish_dynamic_symbol routine gets through with it. */ |
| 6614 | if (sym.st_shndx == SHN_UNDEF |
| 6615 | && h->ref_regular |
| 6616 | && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL |
| 6617 | || ELF_ST_BIND (sym.st_info) == STB_WEAK)) |
| 6618 | { |
| 6619 | int bindtype; |
| 6620 | |
| 6621 | if (h->ref_regular_nonweak) |
| 6622 | bindtype = STB_GLOBAL; |
| 6623 | else |
| 6624 | bindtype = STB_WEAK; |
| 6625 | sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info)); |
| 6626 | } |
| 6627 | |
| 6628 | /* If a non-weak symbol with non-default visibility is not defined |
| 6629 | locally, it is a fatal error. */ |
| 6630 | if (! finfo->info->relocatable |
| 6631 | && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT |
| 6632 | && ELF_ST_BIND (sym.st_info) != STB_WEAK |
| 6633 | && h->root.type == bfd_link_hash_undefined |
| 6634 | && !h->def_regular) |
| 6635 | { |
| 6636 | (*_bfd_error_handler) |
| 6637 | (_("%B: %s symbol `%s' isn't defined"), |
| 6638 | finfo->output_bfd, |
| 6639 | ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED |
| 6640 | ? "protected" |
| 6641 | : ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL |
| 6642 | ? "internal" : "hidden", |
| 6643 | h->root.root.string); |
| 6644 | eoinfo->failed = TRUE; |
| 6645 | return FALSE; |
| 6646 | } |
| 6647 | |
| 6648 | /* If this symbol should be put in the .dynsym section, then put it |
| 6649 | there now. We already know the symbol index. We also fill in |
| 6650 | the entry in the .hash section. */ |
| 6651 | if (h->dynindx != -1 |
| 6652 | && elf_hash_table (finfo->info)->dynamic_sections_created) |
| 6653 | { |
| 6654 | size_t bucketcount; |
| 6655 | size_t bucket; |
| 6656 | size_t hash_entry_size; |
| 6657 | bfd_byte *bucketpos; |
| 6658 | bfd_vma chain; |
| 6659 | bfd_byte *esym; |
| 6660 | |
| 6661 | sym.st_name = h->dynstr_index; |
| 6662 | esym = finfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym; |
| 6663 | if (! check_dynsym (finfo->output_bfd, &sym)) |
| 6664 | { |
| 6665 | eoinfo->failed = TRUE; |
| 6666 | return FALSE; |
| 6667 | } |
| 6668 | bed->s->swap_symbol_out (finfo->output_bfd, &sym, esym, 0); |
| 6669 | |
| 6670 | bucketcount = elf_hash_table (finfo->info)->bucketcount; |
| 6671 | bucket = h->u.elf_hash_value % bucketcount; |
| 6672 | hash_entry_size |
| 6673 | = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize; |
| 6674 | bucketpos = ((bfd_byte *) finfo->hash_sec->contents |
| 6675 | + (bucket + 2) * hash_entry_size); |
| 6676 | chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos); |
| 6677 | bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos); |
| 6678 | bfd_put (8 * hash_entry_size, finfo->output_bfd, chain, |
| 6679 | ((bfd_byte *) finfo->hash_sec->contents |
| 6680 | + (bucketcount + 2 + h->dynindx) * hash_entry_size)); |
| 6681 | |
| 6682 | if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL) |
| 6683 | { |
| 6684 | Elf_Internal_Versym iversym; |
| 6685 | Elf_External_Versym *eversym; |
| 6686 | |
| 6687 | if (!h->def_regular) |
| 6688 | { |
| 6689 | if (h->verinfo.verdef == NULL) |
| 6690 | iversym.vs_vers = 0; |
| 6691 | else |
| 6692 | iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1; |
| 6693 | } |
| 6694 | else |
| 6695 | { |
| 6696 | if (h->verinfo.vertree == NULL) |
| 6697 | iversym.vs_vers = 1; |
| 6698 | else |
| 6699 | iversym.vs_vers = h->verinfo.vertree->vernum + 1; |
| 6700 | if (finfo->info->create_default_symver) |
| 6701 | iversym.vs_vers++; |
| 6702 | } |
| 6703 | |
| 6704 | if (h->hidden) |
| 6705 | iversym.vs_vers |= VERSYM_HIDDEN; |
| 6706 | |
| 6707 | eversym = (Elf_External_Versym *) finfo->symver_sec->contents; |
| 6708 | eversym += h->dynindx; |
| 6709 | _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym); |
| 6710 | } |
| 6711 | } |
| 6712 | |
| 6713 | /* If we're stripping it, then it was just a dynamic symbol, and |
| 6714 | there's nothing else to do. */ |
| 6715 | if (strip || (input_sec->flags & SEC_EXCLUDE) != 0) |
| 6716 | return TRUE; |
| 6717 | |
| 6718 | h->indx = bfd_get_symcount (finfo->output_bfd); |
| 6719 | |
| 6720 | if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec, h)) |
| 6721 | { |
| 6722 | eoinfo->failed = TRUE; |
| 6723 | return FALSE; |
| 6724 | } |
| 6725 | |
| 6726 | return TRUE; |
| 6727 | } |
| 6728 | |
| 6729 | /* Return TRUE if special handling is done for relocs in SEC against |
| 6730 | symbols defined in discarded sections. */ |
| 6731 | |
| 6732 | static bfd_boolean |
| 6733 | elf_section_ignore_discarded_relocs (asection *sec) |
| 6734 | { |
| 6735 | const struct elf_backend_data *bed; |
| 6736 | |
| 6737 | switch (sec->sec_info_type) |
| 6738 | { |
| 6739 | case ELF_INFO_TYPE_STABS: |
| 6740 | case ELF_INFO_TYPE_EH_FRAME: |
| 6741 | return TRUE; |
| 6742 | default: |
| 6743 | break; |
| 6744 | } |
| 6745 | |
| 6746 | bed = get_elf_backend_data (sec->owner); |
| 6747 | if (bed->elf_backend_ignore_discarded_relocs != NULL |
| 6748 | && (*bed->elf_backend_ignore_discarded_relocs) (sec)) |
| 6749 | return TRUE; |
| 6750 | |
| 6751 | return FALSE; |
| 6752 | } |
| 6753 | |
| 6754 | /* Return a mask saying how ld should treat relocations in SEC against |
| 6755 | symbols defined in discarded sections. If this function returns |
| 6756 | COMPLAIN set, ld will issue a warning message. If this function |
| 6757 | returns PRETEND set, and the discarded section was link-once and the |
| 6758 | same size as the kept link-once section, ld will pretend that the |
| 6759 | symbol was actually defined in the kept section. Otherwise ld will |
| 6760 | zero the reloc (at least that is the intent, but some cooperation by |
| 6761 | the target dependent code is needed, particularly for REL targets). */ |
| 6762 | |
| 6763 | unsigned int |
| 6764 | _bfd_elf_default_action_discarded (asection *sec) |
| 6765 | { |
| 6766 | if (sec->flags & SEC_DEBUGGING) |
| 6767 | return PRETEND; |
| 6768 | |
| 6769 | if (strcmp (".eh_frame", sec->name) == 0) |
| 6770 | return 0; |
| 6771 | |
| 6772 | if (strcmp (".gcc_except_table", sec->name) == 0) |
| 6773 | return 0; |
| 6774 | |
| 6775 | return COMPLAIN | PRETEND; |
| 6776 | } |
| 6777 | |
| 6778 | /* Find a match between a section and a member of a section group. */ |
| 6779 | |
| 6780 | static asection * |
| 6781 | match_group_member (asection *sec, asection *group) |
| 6782 | { |
| 6783 | asection *first = elf_next_in_group (group); |
| 6784 | asection *s = first; |
| 6785 | |
| 6786 | while (s != NULL) |
| 6787 | { |
| 6788 | if (bfd_elf_match_symbols_in_sections (s, sec)) |
| 6789 | return s; |
| 6790 | |
| 6791 | s = elf_next_in_group (s); |
| 6792 | if (s == first) |
| 6793 | break; |
| 6794 | } |
| 6795 | |
| 6796 | return NULL; |
| 6797 | } |
| 6798 | |
| 6799 | /* Check if the kept section of a discarded section SEC can be used |
| 6800 | to replace it. Return the replacement if it is OK. Otherwise return |
| 6801 | NULL. */ |
| 6802 | |
| 6803 | asection * |
| 6804 | _bfd_elf_check_kept_section (asection *sec) |
| 6805 | { |
| 6806 | asection *kept; |
| 6807 | |
| 6808 | kept = sec->kept_section; |
| 6809 | if (kept != NULL) |
| 6810 | { |
| 6811 | if (elf_sec_group (sec) != NULL) |
| 6812 | kept = match_group_member (sec, kept); |
| 6813 | if (kept != NULL && sec->size != kept->size) |
| 6814 | kept = NULL; |
| 6815 | } |
| 6816 | return kept; |
| 6817 | } |
| 6818 | |
| 6819 | /* Link an input file into the linker output file. This function |
| 6820 | handles all the sections and relocations of the input file at once. |
| 6821 | This is so that we only have to read the local symbols once, and |
| 6822 | don't have to keep them in memory. */ |
| 6823 | |
| 6824 | static bfd_boolean |
| 6825 | elf_link_input_bfd (struct elf_final_link_info *finfo, bfd *input_bfd) |
| 6826 | { |
| 6827 | bfd_boolean (*relocate_section) |
| 6828 | (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 6829 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **); |
| 6830 | bfd *output_bfd; |
| 6831 | Elf_Internal_Shdr *symtab_hdr; |
| 6832 | size_t locsymcount; |
| 6833 | size_t extsymoff; |
| 6834 | Elf_Internal_Sym *isymbuf; |
| 6835 | Elf_Internal_Sym *isym; |
| 6836 | Elf_Internal_Sym *isymend; |
| 6837 | long *pindex; |
| 6838 | asection **ppsection; |
| 6839 | asection *o; |
| 6840 | const struct elf_backend_data *bed; |
| 6841 | bfd_boolean emit_relocs; |
| 6842 | struct elf_link_hash_entry **sym_hashes; |
| 6843 | |
| 6844 | output_bfd = finfo->output_bfd; |
| 6845 | bed = get_elf_backend_data (output_bfd); |
| 6846 | relocate_section = bed->elf_backend_relocate_section; |
| 6847 | |
| 6848 | /* If this is a dynamic object, we don't want to do anything here: |
| 6849 | we don't want the local symbols, and we don't want the section |
| 6850 | contents. */ |
| 6851 | if ((input_bfd->flags & DYNAMIC) != 0) |
| 6852 | return TRUE; |
| 6853 | |
| 6854 | emit_relocs = (finfo->info->relocatable |
| 6855 | || finfo->info->emitrelocations); |
| 6856 | |
| 6857 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 6858 | if (elf_bad_symtab (input_bfd)) |
| 6859 | { |
| 6860 | locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym; |
| 6861 | extsymoff = 0; |
| 6862 | } |
| 6863 | else |
| 6864 | { |
| 6865 | locsymcount = symtab_hdr->sh_info; |
| 6866 | extsymoff = symtab_hdr->sh_info; |
| 6867 | } |
| 6868 | |
| 6869 | /* Read the local symbols. */ |
| 6870 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 6871 | if (isymbuf == NULL && locsymcount != 0) |
| 6872 | { |
| 6873 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0, |
| 6874 | finfo->internal_syms, |
| 6875 | finfo->external_syms, |
| 6876 | finfo->locsym_shndx); |
| 6877 | if (isymbuf == NULL) |
| 6878 | return FALSE; |
| 6879 | } |
| 6880 | |
| 6881 | /* Find local symbol sections and adjust values of symbols in |
| 6882 | SEC_MERGE sections. Write out those local symbols we know are |
| 6883 | going into the output file. */ |
| 6884 | isymend = isymbuf + locsymcount; |
| 6885 | for (isym = isymbuf, pindex = finfo->indices, ppsection = finfo->sections; |
| 6886 | isym < isymend; |
| 6887 | isym++, pindex++, ppsection++) |
| 6888 | { |
| 6889 | asection *isec; |
| 6890 | const char *name; |
| 6891 | Elf_Internal_Sym osym; |
| 6892 | |
| 6893 | *pindex = -1; |
| 6894 | |
| 6895 | if (elf_bad_symtab (input_bfd)) |
| 6896 | { |
| 6897 | if (ELF_ST_BIND (isym->st_info) != STB_LOCAL) |
| 6898 | { |
| 6899 | *ppsection = NULL; |
| 6900 | continue; |
| 6901 | } |
| 6902 | } |
| 6903 | |
| 6904 | if (isym->st_shndx == SHN_UNDEF) |
| 6905 | isec = bfd_und_section_ptr; |
| 6906 | else if (isym->st_shndx < SHN_LORESERVE |
| 6907 | || isym->st_shndx > SHN_HIRESERVE) |
| 6908 | { |
| 6909 | isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); |
| 6910 | if (isec |
| 6911 | && isec->sec_info_type == ELF_INFO_TYPE_MERGE |
| 6912 | && ELF_ST_TYPE (isym->st_info) != STT_SECTION) |
| 6913 | isym->st_value = |
| 6914 | _bfd_merged_section_offset (output_bfd, &isec, |
| 6915 | elf_section_data (isec)->sec_info, |
| 6916 | isym->st_value); |
| 6917 | } |
| 6918 | else if (isym->st_shndx == SHN_ABS) |
| 6919 | isec = bfd_abs_section_ptr; |
| 6920 | else if (isym->st_shndx == SHN_COMMON) |
| 6921 | isec = bfd_com_section_ptr; |
| 6922 | else |
| 6923 | { |
| 6924 | /* Don't attempt to output symbols with st_shnx in the |
| 6925 | reserved range other than SHN_ABS and SHN_COMMON. */ |
| 6926 | *ppsection = NULL; |
| 6927 | continue; |
| 6928 | } |
| 6929 | |
| 6930 | *ppsection = isec; |
| 6931 | |
| 6932 | /* Don't output the first, undefined, symbol. */ |
| 6933 | if (ppsection == finfo->sections) |
| 6934 | continue; |
| 6935 | |
| 6936 | if (ELF_ST_TYPE (isym->st_info) == STT_SECTION) |
| 6937 | { |
| 6938 | /* We never output section symbols. Instead, we use the |
| 6939 | section symbol of the corresponding section in the output |
| 6940 | file. */ |
| 6941 | continue; |
| 6942 | } |
| 6943 | |
| 6944 | /* If we are stripping all symbols, we don't want to output this |
| 6945 | one. */ |
| 6946 | if (finfo->info->strip == strip_all) |
| 6947 | continue; |
| 6948 | |
| 6949 | /* If we are discarding all local symbols, we don't want to |
| 6950 | output this one. If we are generating a relocatable output |
| 6951 | file, then some of the local symbols may be required by |
| 6952 | relocs; we output them below as we discover that they are |
| 6953 | needed. */ |
| 6954 | if (finfo->info->discard == discard_all) |
| 6955 | continue; |
| 6956 | |
| 6957 | /* If this symbol is defined in a section which we are |
| 6958 | discarding, we don't need to keep it. */ |
| 6959 | if (isym->st_shndx != SHN_UNDEF |
| 6960 | && (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE) |
| 6961 | && (isec == NULL |
| 6962 | || bfd_section_removed_from_list (output_bfd, |
| 6963 | isec->output_section))) |
| 6964 | continue; |
| 6965 | |
| 6966 | /* Get the name of the symbol. */ |
| 6967 | name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, |
| 6968 | isym->st_name); |
| 6969 | if (name == NULL) |
| 6970 | return FALSE; |
| 6971 | |
| 6972 | /* See if we are discarding symbols with this name. */ |
| 6973 | if ((finfo->info->strip == strip_some |
| 6974 | && (bfd_hash_lookup (finfo->info->keep_hash, name, FALSE, FALSE) |
| 6975 | == NULL)) |
| 6976 | || (((finfo->info->discard == discard_sec_merge |
| 6977 | && (isec->flags & SEC_MERGE) && ! finfo->info->relocatable) |
| 6978 | || finfo->info->discard == discard_l) |
| 6979 | && bfd_is_local_label_name (input_bfd, name))) |
| 6980 | continue; |
| 6981 | |
| 6982 | /* If we get here, we are going to output this symbol. */ |
| 6983 | |
| 6984 | osym = *isym; |
| 6985 | |
| 6986 | /* Adjust the section index for the output file. */ |
| 6987 | osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd, |
| 6988 | isec->output_section); |
| 6989 | if (osym.st_shndx == SHN_BAD) |
| 6990 | return FALSE; |
| 6991 | |
| 6992 | *pindex = bfd_get_symcount (output_bfd); |
| 6993 | |
| 6994 | /* ELF symbols in relocatable files are section relative, but |
| 6995 | in executable files they are virtual addresses. Note that |
| 6996 | this code assumes that all ELF sections have an associated |
| 6997 | BFD section with a reasonable value for output_offset; below |
| 6998 | we assume that they also have a reasonable value for |
| 6999 | output_section. Any special sections must be set up to meet |
| 7000 | these requirements. */ |
| 7001 | osym.st_value += isec->output_offset; |
| 7002 | if (! finfo->info->relocatable) |
| 7003 | { |
| 7004 | osym.st_value += isec->output_section->vma; |
| 7005 | if (ELF_ST_TYPE (osym.st_info) == STT_TLS) |
| 7006 | { |
| 7007 | /* STT_TLS symbols are relative to PT_TLS segment base. */ |
| 7008 | BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL); |
| 7009 | osym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma; |
| 7010 | } |
| 7011 | } |
| 7012 | |
| 7013 | if (! elf_link_output_sym (finfo, name, &osym, isec, NULL)) |
| 7014 | return FALSE; |
| 7015 | } |
| 7016 | |
| 7017 | /* Relocate the contents of each section. */ |
| 7018 | sym_hashes = elf_sym_hashes (input_bfd); |
| 7019 | for (o = input_bfd->sections; o != NULL; o = o->next) |
| 7020 | { |
| 7021 | bfd_byte *contents; |
| 7022 | |
| 7023 | if (! o->linker_mark) |
| 7024 | { |
| 7025 | /* This section was omitted from the link. */ |
| 7026 | continue; |
| 7027 | } |
| 7028 | |
| 7029 | if ((o->flags & SEC_HAS_CONTENTS) == 0 |
| 7030 | || (o->size == 0 && (o->flags & SEC_RELOC) == 0)) |
| 7031 | continue; |
| 7032 | |
| 7033 | if ((o->flags & SEC_LINKER_CREATED) != 0) |
| 7034 | { |
| 7035 | /* Section was created by _bfd_elf_link_create_dynamic_sections |
| 7036 | or somesuch. */ |
| 7037 | continue; |
| 7038 | } |
| 7039 | |
| 7040 | /* Get the contents of the section. They have been cached by a |
| 7041 | relaxation routine. Note that o is a section in an input |
| 7042 | file, so the contents field will not have been set by any of |
| 7043 | the routines which work on output files. */ |
| 7044 | if (elf_section_data (o)->this_hdr.contents != NULL) |
| 7045 | contents = elf_section_data (o)->this_hdr.contents; |
| 7046 | else |
| 7047 | { |
| 7048 | bfd_size_type amt = o->rawsize ? o->rawsize : o->size; |
| 7049 | |
| 7050 | contents = finfo->contents; |
| 7051 | if (! bfd_get_section_contents (input_bfd, o, contents, 0, amt)) |
| 7052 | return FALSE; |
| 7053 | } |
| 7054 | |
| 7055 | if ((o->flags & SEC_RELOC) != 0) |
| 7056 | { |
| 7057 | Elf_Internal_Rela *internal_relocs; |
| 7058 | bfd_vma r_type_mask; |
| 7059 | int r_sym_shift; |
| 7060 | |
| 7061 | /* Get the swapped relocs. */ |
| 7062 | internal_relocs |
| 7063 | = _bfd_elf_link_read_relocs (input_bfd, o, finfo->external_relocs, |
| 7064 | finfo->internal_relocs, FALSE); |
| 7065 | if (internal_relocs == NULL |
| 7066 | && o->reloc_count > 0) |
| 7067 | return FALSE; |
| 7068 | |
| 7069 | if (bed->s->arch_size == 32) |
| 7070 | { |
| 7071 | r_type_mask = 0xff; |
| 7072 | r_sym_shift = 8; |
| 7073 | } |
| 7074 | else |
| 7075 | { |
| 7076 | r_type_mask = 0xffffffff; |
| 7077 | r_sym_shift = 32; |
| 7078 | } |
| 7079 | |
| 7080 | /* Run through the relocs looking for any against symbols |
| 7081 | from discarded sections and section symbols from |
| 7082 | removed link-once sections. Complain about relocs |
| 7083 | against discarded sections. Zero relocs against removed |
| 7084 | link-once sections. */ |
| 7085 | if (!elf_section_ignore_discarded_relocs (o)) |
| 7086 | { |
| 7087 | Elf_Internal_Rela *rel, *relend; |
| 7088 | unsigned int action = (*bed->action_discarded) (o); |
| 7089 | |
| 7090 | rel = internal_relocs; |
| 7091 | relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel; |
| 7092 | for ( ; rel < relend; rel++) |
| 7093 | { |
| 7094 | unsigned long r_symndx = rel->r_info >> r_sym_shift; |
| 7095 | asection **ps, *sec; |
| 7096 | struct elf_link_hash_entry *h = NULL; |
| 7097 | const char *sym_name; |
| 7098 | |
| 7099 | if (r_symndx == STN_UNDEF) |
| 7100 | continue; |
| 7101 | |
| 7102 | if (r_symndx >= locsymcount |
| 7103 | || (elf_bad_symtab (input_bfd) |
| 7104 | && finfo->sections[r_symndx] == NULL)) |
| 7105 | { |
| 7106 | h = sym_hashes[r_symndx - extsymoff]; |
| 7107 | |
| 7108 | /* Badly formatted input files can contain relocs that |
| 7109 | reference non-existant symbols. Check here so that |
| 7110 | we do not seg fault. */ |
| 7111 | if (h == NULL) |
| 7112 | { |
| 7113 | char buffer [32]; |
| 7114 | |
| 7115 | sprintf_vma (buffer, rel->r_info); |
| 7116 | (*_bfd_error_handler) |
| 7117 | (_("error: %B contains a reloc (0x%s) for section %A " |
| 7118 | "that references a non-existent global symbol"), |
| 7119 | input_bfd, o, buffer); |
| 7120 | bfd_set_error (bfd_error_bad_value); |
| 7121 | return FALSE; |
| 7122 | } |
| 7123 | |
| 7124 | while (h->root.type == bfd_link_hash_indirect |
| 7125 | || h->root.type == bfd_link_hash_warning) |
| 7126 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 7127 | |
| 7128 | if (h->root.type != bfd_link_hash_defined |
| 7129 | && h->root.type != bfd_link_hash_defweak) |
| 7130 | continue; |
| 7131 | |
| 7132 | ps = &h->root.u.def.section; |
| 7133 | sym_name = h->root.root.string; |
| 7134 | } |
| 7135 | else |
| 7136 | { |
| 7137 | Elf_Internal_Sym *sym = isymbuf + r_symndx; |
| 7138 | ps = &finfo->sections[r_symndx]; |
| 7139 | sym_name = bfd_elf_sym_name (input_bfd, |
| 7140 | symtab_hdr, |
| 7141 | sym, *ps); |
| 7142 | } |
| 7143 | |
| 7144 | /* Complain if the definition comes from a |
| 7145 | discarded section. */ |
| 7146 | if ((sec = *ps) != NULL && elf_discarded_section (sec)) |
| 7147 | { |
| 7148 | BFD_ASSERT (r_symndx != 0); |
| 7149 | if (action & COMPLAIN) |
| 7150 | (*finfo->info->callbacks->einfo) |
| 7151 | (_("%X`%s' referenced in section `%A' of %B: " |
| 7152 | "defined in discarded section `%A' of %B\n"), |
| 7153 | sym_name, o, input_bfd, sec, sec->owner); |
| 7154 | |
| 7155 | /* Try to do the best we can to support buggy old |
| 7156 | versions of gcc. Pretend that the symbol is |
| 7157 | really defined in the kept linkonce section. |
| 7158 | FIXME: This is quite broken. Modifying the |
| 7159 | symbol here means we will be changing all later |
| 7160 | uses of the symbol, not just in this section. */ |
| 7161 | if (action & PRETEND) |
| 7162 | { |
| 7163 | asection *kept; |
| 7164 | |
| 7165 | kept = _bfd_elf_check_kept_section (sec); |
| 7166 | if (kept != NULL) |
| 7167 | { |
| 7168 | *ps = kept; |
| 7169 | continue; |
| 7170 | } |
| 7171 | } |
| 7172 | |
| 7173 | /* Remove the symbol reference from the reloc, but |
| 7174 | don't kill the reloc completely. This is so that |
| 7175 | a zero value will be written into the section, |
| 7176 | which may have non-zero contents put there by the |
| 7177 | assembler. Zero in things like an eh_frame fde |
| 7178 | pc_begin allows stack unwinders to recognize the |
| 7179 | fde as bogus. */ |
| 7180 | rel->r_info &= r_type_mask; |
| 7181 | rel->r_addend = 0; |
| 7182 | } |
| 7183 | } |
| 7184 | } |
| 7185 | |
| 7186 | /* Relocate the section by invoking a back end routine. |
| 7187 | |
| 7188 | The back end routine is responsible for adjusting the |
| 7189 | section contents as necessary, and (if using Rela relocs |
| 7190 | and generating a relocatable output file) adjusting the |
| 7191 | reloc addend as necessary. |
| 7192 | |
| 7193 | The back end routine does not have to worry about setting |
| 7194 | the reloc address or the reloc symbol index. |
| 7195 | |
| 7196 | The back end routine is given a pointer to the swapped in |
| 7197 | internal symbols, and can access the hash table entries |
| 7198 | for the external symbols via elf_sym_hashes (input_bfd). |
| 7199 | |
| 7200 | When generating relocatable output, the back end routine |
| 7201 | must handle STB_LOCAL/STT_SECTION symbols specially. The |
| 7202 | output symbol is going to be a section symbol |
| 7203 | corresponding to the output section, which will require |
| 7204 | the addend to be adjusted. */ |
| 7205 | |
| 7206 | if (! (*relocate_section) (output_bfd, finfo->info, |
| 7207 | input_bfd, o, contents, |
| 7208 | internal_relocs, |
| 7209 | isymbuf, |
| 7210 | finfo->sections)) |
| 7211 | return FALSE; |
| 7212 | |
| 7213 | if (emit_relocs) |
| 7214 | { |
| 7215 | Elf_Internal_Rela *irela; |
| 7216 | Elf_Internal_Rela *irelaend; |
| 7217 | bfd_vma last_offset; |
| 7218 | struct elf_link_hash_entry **rel_hash; |
| 7219 | struct elf_link_hash_entry **rel_hash_list; |
| 7220 | Elf_Internal_Shdr *input_rel_hdr, *input_rel_hdr2; |
| 7221 | unsigned int next_erel; |
| 7222 | bfd_boolean rela_normal; |
| 7223 | |
| 7224 | input_rel_hdr = &elf_section_data (o)->rel_hdr; |
| 7225 | rela_normal = (bed->rela_normal |
| 7226 | && (input_rel_hdr->sh_entsize |
| 7227 | == bed->s->sizeof_rela)); |
| 7228 | |
| 7229 | /* Adjust the reloc addresses and symbol indices. */ |
| 7230 | |
| 7231 | irela = internal_relocs; |
| 7232 | irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel; |
| 7233 | rel_hash = (elf_section_data (o->output_section)->rel_hashes |
| 7234 | + elf_section_data (o->output_section)->rel_count |
| 7235 | + elf_section_data (o->output_section)->rel_count2); |
| 7236 | rel_hash_list = rel_hash; |
| 7237 | last_offset = o->output_offset; |
| 7238 | if (!finfo->info->relocatable) |
| 7239 | last_offset += o->output_section->vma; |
| 7240 | for (next_erel = 0; irela < irelaend; irela++, next_erel++) |
| 7241 | { |
| 7242 | unsigned long r_symndx; |
| 7243 | asection *sec; |
| 7244 | Elf_Internal_Sym sym; |
| 7245 | |
| 7246 | if (next_erel == bed->s->int_rels_per_ext_rel) |
| 7247 | { |
| 7248 | rel_hash++; |
| 7249 | next_erel = 0; |
| 7250 | } |
| 7251 | |
| 7252 | irela->r_offset = _bfd_elf_section_offset (output_bfd, |
| 7253 | finfo->info, o, |
| 7254 | irela->r_offset); |
| 7255 | if (irela->r_offset >= (bfd_vma) -2) |
| 7256 | { |
| 7257 | /* This is a reloc for a deleted entry or somesuch. |
| 7258 | Turn it into an R_*_NONE reloc, at the same |
| 7259 | offset as the last reloc. elf_eh_frame.c and |
| 7260 | bfd_elf_discard_info rely on reloc offsets |
| 7261 | being ordered. */ |
| 7262 | irela->r_offset = last_offset; |
| 7263 | irela->r_info = 0; |
| 7264 | irela->r_addend = 0; |
| 7265 | continue; |
| 7266 | } |
| 7267 | |
| 7268 | irela->r_offset += o->output_offset; |
| 7269 | |
| 7270 | /* Relocs in an executable have to be virtual addresses. */ |
| 7271 | if (!finfo->info->relocatable) |
| 7272 | irela->r_offset += o->output_section->vma; |
| 7273 | |
| 7274 | last_offset = irela->r_offset; |
| 7275 | |
| 7276 | r_symndx = irela->r_info >> r_sym_shift; |
| 7277 | if (r_symndx == STN_UNDEF) |
| 7278 | continue; |
| 7279 | |
| 7280 | if (r_symndx >= locsymcount |
| 7281 | || (elf_bad_symtab (input_bfd) |
| 7282 | && finfo->sections[r_symndx] == NULL)) |
| 7283 | { |
| 7284 | struct elf_link_hash_entry *rh; |
| 7285 | unsigned long indx; |
| 7286 | |
| 7287 | /* This is a reloc against a global symbol. We |
| 7288 | have not yet output all the local symbols, so |
| 7289 | we do not know the symbol index of any global |
| 7290 | symbol. We set the rel_hash entry for this |
| 7291 | reloc to point to the global hash table entry |
| 7292 | for this symbol. The symbol index is then |
| 7293 | set at the end of bfd_elf_final_link. */ |
| 7294 | indx = r_symndx - extsymoff; |
| 7295 | rh = elf_sym_hashes (input_bfd)[indx]; |
| 7296 | while (rh->root.type == bfd_link_hash_indirect |
| 7297 | || rh->root.type == bfd_link_hash_warning) |
| 7298 | rh = (struct elf_link_hash_entry *) rh->root.u.i.link; |
| 7299 | |
| 7300 | /* Setting the index to -2 tells |
| 7301 | elf_link_output_extsym that this symbol is |
| 7302 | used by a reloc. */ |
| 7303 | BFD_ASSERT (rh->indx < 0); |
| 7304 | rh->indx = -2; |
| 7305 | |
| 7306 | *rel_hash = rh; |
| 7307 | |
| 7308 | continue; |
| 7309 | } |
| 7310 | |
| 7311 | /* This is a reloc against a local symbol. */ |
| 7312 | |
| 7313 | *rel_hash = NULL; |
| 7314 | sym = isymbuf[r_symndx]; |
| 7315 | sec = finfo->sections[r_symndx]; |
| 7316 | if (ELF_ST_TYPE (sym.st_info) == STT_SECTION) |
| 7317 | { |
| 7318 | /* I suppose the backend ought to fill in the |
| 7319 | section of any STT_SECTION symbol against a |
| 7320 | processor specific section. */ |
| 7321 | r_symndx = 0; |
| 7322 | if (bfd_is_abs_section (sec)) |
| 7323 | ; |
| 7324 | else if (sec == NULL || sec->owner == NULL) |
| 7325 | { |
| 7326 | bfd_set_error (bfd_error_bad_value); |
| 7327 | return FALSE; |
| 7328 | } |
| 7329 | else |
| 7330 | { |
| 7331 | asection *osec = sec->output_section; |
| 7332 | |
| 7333 | /* If we have discarded a section, the output |
| 7334 | section will be the absolute section. In |
| 7335 | case of discarded link-once and discarded |
| 7336 | SEC_MERGE sections, use the kept section. */ |
| 7337 | if (bfd_is_abs_section (osec) |
| 7338 | && sec->kept_section != NULL |
| 7339 | && sec->kept_section->output_section != NULL) |
| 7340 | { |
| 7341 | osec = sec->kept_section->output_section; |
| 7342 | irela->r_addend -= osec->vma; |
| 7343 | } |
| 7344 | |
| 7345 | if (!bfd_is_abs_section (osec)) |
| 7346 | { |
| 7347 | r_symndx = osec->target_index; |
| 7348 | BFD_ASSERT (r_symndx != 0); |
| 7349 | } |
| 7350 | } |
| 7351 | |
| 7352 | /* Adjust the addend according to where the |
| 7353 | section winds up in the output section. */ |
| 7354 | if (rela_normal) |
| 7355 | irela->r_addend += sec->output_offset; |
| 7356 | } |
| 7357 | else |
| 7358 | { |
| 7359 | if (finfo->indices[r_symndx] == -1) |
| 7360 | { |
| 7361 | unsigned long shlink; |
| 7362 | const char *name; |
| 7363 | asection *osec; |
| 7364 | |
| 7365 | if (finfo->info->strip == strip_all) |
| 7366 | { |
| 7367 | /* You can't do ld -r -s. */ |
| 7368 | bfd_set_error (bfd_error_invalid_operation); |
| 7369 | return FALSE; |
| 7370 | } |
| 7371 | |
| 7372 | /* This symbol was skipped earlier, but |
| 7373 | since it is needed by a reloc, we |
| 7374 | must output it now. */ |
| 7375 | shlink = symtab_hdr->sh_link; |
| 7376 | name = (bfd_elf_string_from_elf_section |
| 7377 | (input_bfd, shlink, sym.st_name)); |
| 7378 | if (name == NULL) |
| 7379 | return FALSE; |
| 7380 | |
| 7381 | osec = sec->output_section; |
| 7382 | sym.st_shndx = |
| 7383 | _bfd_elf_section_from_bfd_section (output_bfd, |
| 7384 | osec); |
| 7385 | if (sym.st_shndx == SHN_BAD) |
| 7386 | return FALSE; |
| 7387 | |
| 7388 | sym.st_value += sec->output_offset; |
| 7389 | if (! finfo->info->relocatable) |
| 7390 | { |
| 7391 | sym.st_value += osec->vma; |
| 7392 | if (ELF_ST_TYPE (sym.st_info) == STT_TLS) |
| 7393 | { |
| 7394 | /* STT_TLS symbols are relative to PT_TLS |
| 7395 | segment base. */ |
| 7396 | BFD_ASSERT (elf_hash_table (finfo->info) |
| 7397 | ->tls_sec != NULL); |
| 7398 | sym.st_value -= (elf_hash_table (finfo->info) |
| 7399 | ->tls_sec->vma); |
| 7400 | } |
| 7401 | } |
| 7402 | |
| 7403 | finfo->indices[r_symndx] |
| 7404 | = bfd_get_symcount (output_bfd); |
| 7405 | |
| 7406 | if (! elf_link_output_sym (finfo, name, &sym, sec, |
| 7407 | NULL)) |
| 7408 | return FALSE; |
| 7409 | } |
| 7410 | |
| 7411 | r_symndx = finfo->indices[r_symndx]; |
| 7412 | } |
| 7413 | |
| 7414 | irela->r_info = ((bfd_vma) r_symndx << r_sym_shift |
| 7415 | | (irela->r_info & r_type_mask)); |
| 7416 | } |
| 7417 | |
| 7418 | /* Swap out the relocs. */ |
| 7419 | if (input_rel_hdr->sh_size != 0 |
| 7420 | && !bed->elf_backend_emit_relocs (output_bfd, o, |
| 7421 | input_rel_hdr, |
| 7422 | internal_relocs, |
| 7423 | rel_hash_list)) |
| 7424 | return FALSE; |
| 7425 | |
| 7426 | input_rel_hdr2 = elf_section_data (o)->rel_hdr2; |
| 7427 | if (input_rel_hdr2 && input_rel_hdr2->sh_size != 0) |
| 7428 | { |
| 7429 | internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr) |
| 7430 | * bed->s->int_rels_per_ext_rel); |
| 7431 | rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr); |
| 7432 | if (!bed->elf_backend_emit_relocs (output_bfd, o, |
| 7433 | input_rel_hdr2, |
| 7434 | internal_relocs, |
| 7435 | rel_hash_list)) |
| 7436 | return FALSE; |
| 7437 | } |
| 7438 | } |
| 7439 | } |
| 7440 | |
| 7441 | /* Write out the modified section contents. */ |
| 7442 | if (bed->elf_backend_write_section |
| 7443 | && (*bed->elf_backend_write_section) (output_bfd, o, contents)) |
| 7444 | { |
| 7445 | /* Section written out. */ |
| 7446 | } |
| 7447 | else switch (o->sec_info_type) |
| 7448 | { |
| 7449 | case ELF_INFO_TYPE_STABS: |
| 7450 | if (! (_bfd_write_section_stabs |
| 7451 | (output_bfd, |
| 7452 | &elf_hash_table (finfo->info)->stab_info, |
| 7453 | o, &elf_section_data (o)->sec_info, contents))) |
| 7454 | return FALSE; |
| 7455 | break; |
| 7456 | case ELF_INFO_TYPE_MERGE: |
| 7457 | if (! _bfd_write_merged_section (output_bfd, o, |
| 7458 | elf_section_data (o)->sec_info)) |
| 7459 | return FALSE; |
| 7460 | break; |
| 7461 | case ELF_INFO_TYPE_EH_FRAME: |
| 7462 | { |
| 7463 | if (! _bfd_elf_write_section_eh_frame (output_bfd, finfo->info, |
| 7464 | o, contents)) |
| 7465 | return FALSE; |
| 7466 | } |
| 7467 | break; |
| 7468 | default: |
| 7469 | { |
| 7470 | if (! (o->flags & SEC_EXCLUDE) |
| 7471 | && ! bfd_set_section_contents (output_bfd, o->output_section, |
| 7472 | contents, |
| 7473 | (file_ptr) o->output_offset, |
| 7474 | o->size)) |
| 7475 | return FALSE; |
| 7476 | } |
| 7477 | break; |
| 7478 | } |
| 7479 | } |
| 7480 | |
| 7481 | return TRUE; |
| 7482 | } |
| 7483 | |
| 7484 | /* Generate a reloc when linking an ELF file. This is a reloc |
| 7485 | requested by the linker, and does not come from any input file. This |
| 7486 | is used to build constructor and destructor tables when linking |
| 7487 | with -Ur. */ |
| 7488 | |
| 7489 | static bfd_boolean |
| 7490 | elf_reloc_link_order (bfd *output_bfd, |
| 7491 | struct bfd_link_info *info, |
| 7492 | asection *output_section, |
| 7493 | struct bfd_link_order *link_order) |
| 7494 | { |
| 7495 | reloc_howto_type *howto; |
| 7496 | long indx; |
| 7497 | bfd_vma offset; |
| 7498 | bfd_vma addend; |
| 7499 | struct elf_link_hash_entry **rel_hash_ptr; |
| 7500 | Elf_Internal_Shdr *rel_hdr; |
| 7501 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); |
| 7502 | Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL]; |
| 7503 | bfd_byte *erel; |
| 7504 | unsigned int i; |
| 7505 | |
| 7506 | howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc); |
| 7507 | if (howto == NULL) |
| 7508 | { |
| 7509 | bfd_set_error (bfd_error_bad_value); |
| 7510 | return FALSE; |
| 7511 | } |
| 7512 | |
| 7513 | addend = link_order->u.reloc.p->addend; |
| 7514 | |
| 7515 | /* Figure out the symbol index. */ |
| 7516 | rel_hash_ptr = (elf_section_data (output_section)->rel_hashes |
| 7517 | + elf_section_data (output_section)->rel_count |
| 7518 | + elf_section_data (output_section)->rel_count2); |
| 7519 | if (link_order->type == bfd_section_reloc_link_order) |
| 7520 | { |
| 7521 | indx = link_order->u.reloc.p->u.section->target_index; |
| 7522 | BFD_ASSERT (indx != 0); |
| 7523 | *rel_hash_ptr = NULL; |
| 7524 | } |
| 7525 | else |
| 7526 | { |
| 7527 | struct elf_link_hash_entry *h; |
| 7528 | |
| 7529 | /* Treat a reloc against a defined symbol as though it were |
| 7530 | actually against the section. */ |
| 7531 | h = ((struct elf_link_hash_entry *) |
| 7532 | bfd_wrapped_link_hash_lookup (output_bfd, info, |
| 7533 | link_order->u.reloc.p->u.name, |
| 7534 | FALSE, FALSE, TRUE)); |
| 7535 | if (h != NULL |
| 7536 | && (h->root.type == bfd_link_hash_defined |
| 7537 | || h->root.type == bfd_link_hash_defweak)) |
| 7538 | { |
| 7539 | asection *section; |
| 7540 | |
| 7541 | section = h->root.u.def.section; |
| 7542 | indx = section->output_section->target_index; |
| 7543 | *rel_hash_ptr = NULL; |
| 7544 | /* It seems that we ought to add the symbol value to the |
| 7545 | addend here, but in practice it has already been added |
| 7546 | because it was passed to constructor_callback. */ |
| 7547 | addend += section->output_section->vma + section->output_offset; |
| 7548 | } |
| 7549 | else if (h != NULL) |
| 7550 | { |
| 7551 | /* Setting the index to -2 tells elf_link_output_extsym that |
| 7552 | this symbol is used by a reloc. */ |
| 7553 | h->indx = -2; |
| 7554 | *rel_hash_ptr = h; |
| 7555 | indx = 0; |
| 7556 | } |
| 7557 | else |
| 7558 | { |
| 7559 | if (! ((*info->callbacks->unattached_reloc) |
| 7560 | (info, link_order->u.reloc.p->u.name, NULL, NULL, 0))) |
| 7561 | return FALSE; |
| 7562 | indx = 0; |
| 7563 | } |
| 7564 | } |
| 7565 | |
| 7566 | /* If this is an inplace reloc, we must write the addend into the |
| 7567 | object file. */ |
| 7568 | if (howto->partial_inplace && addend != 0) |
| 7569 | { |
| 7570 | bfd_size_type size; |
| 7571 | bfd_reloc_status_type rstat; |
| 7572 | bfd_byte *buf; |
| 7573 | bfd_boolean ok; |
| 7574 | const char *sym_name; |
| 7575 | |
| 7576 | size = bfd_get_reloc_size (howto); |
| 7577 | buf = bfd_zmalloc (size); |
| 7578 | if (buf == NULL) |
| 7579 | return FALSE; |
| 7580 | rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf); |
| 7581 | switch (rstat) |
| 7582 | { |
| 7583 | case bfd_reloc_ok: |
| 7584 | break; |
| 7585 | |
| 7586 | default: |
| 7587 | case bfd_reloc_outofrange: |
| 7588 | abort (); |
| 7589 | |
| 7590 | case bfd_reloc_overflow: |
| 7591 | if (link_order->type == bfd_section_reloc_link_order) |
| 7592 | sym_name = bfd_section_name (output_bfd, |
| 7593 | link_order->u.reloc.p->u.section); |
| 7594 | else |
| 7595 | sym_name = link_order->u.reloc.p->u.name; |
| 7596 | if (! ((*info->callbacks->reloc_overflow) |
| 7597 | (info, NULL, sym_name, howto->name, addend, NULL, |
| 7598 | NULL, (bfd_vma) 0))) |
| 7599 | { |
| 7600 | free (buf); |
| 7601 | return FALSE; |
| 7602 | } |
| 7603 | break; |
| 7604 | } |
| 7605 | ok = bfd_set_section_contents (output_bfd, output_section, buf, |
| 7606 | link_order->offset, size); |
| 7607 | free (buf); |
| 7608 | if (! ok) |
| 7609 | return FALSE; |
| 7610 | } |
| 7611 | |
| 7612 | /* The address of a reloc is relative to the section in a |
| 7613 | relocatable file, and is a virtual address in an executable |
| 7614 | file. */ |
| 7615 | offset = link_order->offset; |
| 7616 | if (! info->relocatable) |
| 7617 | offset += output_section->vma; |
| 7618 | |
| 7619 | for (i = 0; i < bed->s->int_rels_per_ext_rel; i++) |
| 7620 | { |
| 7621 | irel[i].r_offset = offset; |
| 7622 | irel[i].r_info = 0; |
| 7623 | irel[i].r_addend = 0; |
| 7624 | } |
| 7625 | if (bed->s->arch_size == 32) |
| 7626 | irel[0].r_info = ELF32_R_INFO (indx, howto->type); |
| 7627 | else |
| 7628 | irel[0].r_info = ELF64_R_INFO (indx, howto->type); |
| 7629 | |
| 7630 | rel_hdr = &elf_section_data (output_section)->rel_hdr; |
| 7631 | erel = rel_hdr->contents; |
| 7632 | if (rel_hdr->sh_type == SHT_REL) |
| 7633 | { |
| 7634 | erel += (elf_section_data (output_section)->rel_count |
| 7635 | * bed->s->sizeof_rel); |
| 7636 | (*bed->s->swap_reloc_out) (output_bfd, irel, erel); |
| 7637 | } |
| 7638 | else |
| 7639 | { |
| 7640 | irel[0].r_addend = addend; |
| 7641 | erel += (elf_section_data (output_section)->rel_count |
| 7642 | * bed->s->sizeof_rela); |
| 7643 | (*bed->s->swap_reloca_out) (output_bfd, irel, erel); |
| 7644 | } |
| 7645 | |
| 7646 | ++elf_section_data (output_section)->rel_count; |
| 7647 | |
| 7648 | return TRUE; |
| 7649 | } |
| 7650 | |
| 7651 | |
| 7652 | /* Get the output vma of the section pointed to by the sh_link field. */ |
| 7653 | |
| 7654 | static bfd_vma |
| 7655 | elf_get_linked_section_vma (struct bfd_link_order *p) |
| 7656 | { |
| 7657 | Elf_Internal_Shdr **elf_shdrp; |
| 7658 | asection *s; |
| 7659 | int elfsec; |
| 7660 | |
| 7661 | s = p->u.indirect.section; |
| 7662 | elf_shdrp = elf_elfsections (s->owner); |
| 7663 | elfsec = _bfd_elf_section_from_bfd_section (s->owner, s); |
| 7664 | elfsec = elf_shdrp[elfsec]->sh_link; |
| 7665 | /* PR 290: |
| 7666 | The Intel C compiler generates SHT_IA_64_UNWIND with |
| 7667 | SHF_LINK_ORDER. But it doesn't set the sh_link or |
| 7668 | sh_info fields. Hence we could get the situation |
| 7669 | where elfsec is 0. */ |
| 7670 | if (elfsec == 0) |
| 7671 | { |
| 7672 | const struct elf_backend_data *bed |
| 7673 | = get_elf_backend_data (s->owner); |
| 7674 | if (bed->link_order_error_handler) |
| 7675 | bed->link_order_error_handler |
| 7676 | (_("%B: warning: sh_link not set for section `%A'"), s->owner, s); |
| 7677 | return 0; |
| 7678 | } |
| 7679 | else |
| 7680 | { |
| 7681 | s = elf_shdrp[elfsec]->bfd_section; |
| 7682 | return s->output_section->vma + s->output_offset; |
| 7683 | } |
| 7684 | } |
| 7685 | |
| 7686 | |
| 7687 | /* Compare two sections based on the locations of the sections they are |
| 7688 | linked to. Used by elf_fixup_link_order. */ |
| 7689 | |
| 7690 | static int |
| 7691 | compare_link_order (const void * a, const void * b) |
| 7692 | { |
| 7693 | bfd_vma apos; |
| 7694 | bfd_vma bpos; |
| 7695 | |
| 7696 | apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a); |
| 7697 | bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b); |
| 7698 | if (apos < bpos) |
| 7699 | return -1; |
| 7700 | return apos > bpos; |
| 7701 | } |
| 7702 | |
| 7703 | |
| 7704 | /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same |
| 7705 | order as their linked sections. Returns false if this could not be done |
| 7706 | because an output section includes both ordered and unordered |
| 7707 | sections. Ideally we'd do this in the linker proper. */ |
| 7708 | |
| 7709 | static bfd_boolean |
| 7710 | elf_fixup_link_order (bfd *abfd, asection *o) |
| 7711 | { |
| 7712 | int seen_linkorder; |
| 7713 | int seen_other; |
| 7714 | int n; |
| 7715 | struct bfd_link_order *p; |
| 7716 | bfd *sub; |
| 7717 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 7718 | unsigned elfsec; |
| 7719 | struct bfd_link_order **sections; |
| 7720 | asection *s, *other_sec, *linkorder_sec; |
| 7721 | bfd_vma offset; |
| 7722 | |
| 7723 | other_sec = NULL; |
| 7724 | linkorder_sec = NULL; |
| 7725 | seen_other = 0; |
| 7726 | seen_linkorder = 0; |
| 7727 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 7728 | { |
| 7729 | if (p->type == bfd_indirect_link_order) |
| 7730 | { |
| 7731 | s = p->u.indirect.section; |
| 7732 | sub = s->owner; |
| 7733 | if (bfd_get_flavour (sub) == bfd_target_elf_flavour |
| 7734 | && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass |
| 7735 | && (elfsec = _bfd_elf_section_from_bfd_section (sub, s)) |
| 7736 | && elfsec < elf_numsections (sub) |
| 7737 | && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER) |
| 7738 | { |
| 7739 | seen_linkorder++; |
| 7740 | linkorder_sec = s; |
| 7741 | } |
| 7742 | else |
| 7743 | { |
| 7744 | seen_other++; |
| 7745 | other_sec = s; |
| 7746 | } |
| 7747 | } |
| 7748 | else |
| 7749 | seen_other++; |
| 7750 | |
| 7751 | if (seen_other && seen_linkorder) |
| 7752 | { |
| 7753 | if (other_sec && linkorder_sec) |
| 7754 | (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"), |
| 7755 | o, linkorder_sec, |
| 7756 | linkorder_sec->owner, other_sec, |
| 7757 | other_sec->owner); |
| 7758 | else |
| 7759 | (*_bfd_error_handler) (_("%A has both ordered and unordered sections"), |
| 7760 | o); |
| 7761 | bfd_set_error (bfd_error_bad_value); |
| 7762 | return FALSE; |
| 7763 | } |
| 7764 | } |
| 7765 | |
| 7766 | if (!seen_linkorder) |
| 7767 | return TRUE; |
| 7768 | |
| 7769 | sections = (struct bfd_link_order **) |
| 7770 | xmalloc (seen_linkorder * sizeof (struct bfd_link_order *)); |
| 7771 | seen_linkorder = 0; |
| 7772 | |
| 7773 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 7774 | { |
| 7775 | sections[seen_linkorder++] = p; |
| 7776 | } |
| 7777 | /* Sort the input sections in the order of their linked section. */ |
| 7778 | qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *), |
| 7779 | compare_link_order); |
| 7780 | |
| 7781 | /* Change the offsets of the sections. */ |
| 7782 | offset = 0; |
| 7783 | for (n = 0; n < seen_linkorder; n++) |
| 7784 | { |
| 7785 | s = sections[n]->u.indirect.section; |
| 7786 | offset &= ~(bfd_vma)((1 << s->alignment_power) - 1); |
| 7787 | s->output_offset = offset; |
| 7788 | sections[n]->offset = offset; |
| 7789 | offset += sections[n]->size; |
| 7790 | } |
| 7791 | |
| 7792 | return TRUE; |
| 7793 | } |
| 7794 | |
| 7795 | |
| 7796 | /* Do the final step of an ELF link. */ |
| 7797 | |
| 7798 | bfd_boolean |
| 7799 | bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info) |
| 7800 | { |
| 7801 | bfd_boolean dynamic; |
| 7802 | bfd_boolean emit_relocs; |
| 7803 | bfd *dynobj; |
| 7804 | struct elf_final_link_info finfo; |
| 7805 | register asection *o; |
| 7806 | register struct bfd_link_order *p; |
| 7807 | register bfd *sub; |
| 7808 | bfd_size_type max_contents_size; |
| 7809 | bfd_size_type max_external_reloc_size; |
| 7810 | bfd_size_type max_internal_reloc_count; |
| 7811 | bfd_size_type max_sym_count; |
| 7812 | bfd_size_type max_sym_shndx_count; |
| 7813 | file_ptr off; |
| 7814 | Elf_Internal_Sym elfsym; |
| 7815 | unsigned int i; |
| 7816 | Elf_Internal_Shdr *symtab_hdr; |
| 7817 | Elf_Internal_Shdr *symtab_shndx_hdr; |
| 7818 | Elf_Internal_Shdr *symstrtab_hdr; |
| 7819 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 7820 | struct elf_outext_info eoinfo; |
| 7821 | bfd_boolean merged; |
| 7822 | size_t relativecount = 0; |
| 7823 | asection *reldyn = 0; |
| 7824 | bfd_size_type amt; |
| 7825 | |
| 7826 | if (! is_elf_hash_table (info->hash)) |
| 7827 | return FALSE; |
| 7828 | |
| 7829 | if (info->shared) |
| 7830 | abfd->flags |= DYNAMIC; |
| 7831 | |
| 7832 | dynamic = elf_hash_table (info)->dynamic_sections_created; |
| 7833 | dynobj = elf_hash_table (info)->dynobj; |
| 7834 | |
| 7835 | emit_relocs = (info->relocatable |
| 7836 | || info->emitrelocations); |
| 7837 | |
| 7838 | finfo.info = info; |
| 7839 | finfo.output_bfd = abfd; |
| 7840 | finfo.symstrtab = _bfd_elf_stringtab_init (); |
| 7841 | if (finfo.symstrtab == NULL) |
| 7842 | return FALSE; |
| 7843 | |
| 7844 | if (! dynamic) |
| 7845 | { |
| 7846 | finfo.dynsym_sec = NULL; |
| 7847 | finfo.hash_sec = NULL; |
| 7848 | finfo.symver_sec = NULL; |
| 7849 | } |
| 7850 | else |
| 7851 | { |
| 7852 | finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym"); |
| 7853 | finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash"); |
| 7854 | BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL); |
| 7855 | finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version"); |
| 7856 | /* Note that it is OK if symver_sec is NULL. */ |
| 7857 | } |
| 7858 | |
| 7859 | finfo.contents = NULL; |
| 7860 | finfo.external_relocs = NULL; |
| 7861 | finfo.internal_relocs = NULL; |
| 7862 | finfo.external_syms = NULL; |
| 7863 | finfo.locsym_shndx = NULL; |
| 7864 | finfo.internal_syms = NULL; |
| 7865 | finfo.indices = NULL; |
| 7866 | finfo.sections = NULL; |
| 7867 | finfo.symbuf = NULL; |
| 7868 | finfo.symshndxbuf = NULL; |
| 7869 | finfo.symbuf_count = 0; |
| 7870 | finfo.shndxbuf_size = 0; |
| 7871 | |
| 7872 | /* Count up the number of relocations we will output for each output |
| 7873 | section, so that we know the sizes of the reloc sections. We |
| 7874 | also figure out some maximum sizes. */ |
| 7875 | max_contents_size = 0; |
| 7876 | max_external_reloc_size = 0; |
| 7877 | max_internal_reloc_count = 0; |
| 7878 | max_sym_count = 0; |
| 7879 | max_sym_shndx_count = 0; |
| 7880 | merged = FALSE; |
| 7881 | for (o = abfd->sections; o != NULL; o = o->next) |
| 7882 | { |
| 7883 | struct bfd_elf_section_data *esdo = elf_section_data (o); |
| 7884 | o->reloc_count = 0; |
| 7885 | |
| 7886 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 7887 | { |
| 7888 | unsigned int reloc_count = 0; |
| 7889 | struct bfd_elf_section_data *esdi = NULL; |
| 7890 | unsigned int *rel_count1; |
| 7891 | |
| 7892 | if (p->type == bfd_section_reloc_link_order |
| 7893 | || p->type == bfd_symbol_reloc_link_order) |
| 7894 | reloc_count = 1; |
| 7895 | else if (p->type == bfd_indirect_link_order) |
| 7896 | { |
| 7897 | asection *sec; |
| 7898 | |
| 7899 | sec = p->u.indirect.section; |
| 7900 | esdi = elf_section_data (sec); |
| 7901 | |
| 7902 | /* Mark all sections which are to be included in the |
| 7903 | link. This will normally be every section. We need |
| 7904 | to do this so that we can identify any sections which |
| 7905 | the linker has decided to not include. */ |
| 7906 | sec->linker_mark = TRUE; |
| 7907 | |
| 7908 | if (sec->flags & SEC_MERGE) |
| 7909 | merged = TRUE; |
| 7910 | |
| 7911 | if (info->relocatable || info->emitrelocations) |
| 7912 | reloc_count = sec->reloc_count; |
| 7913 | else if (bed->elf_backend_count_relocs) |
| 7914 | { |
| 7915 | Elf_Internal_Rela * relocs; |
| 7916 | |
| 7917 | relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, |
| 7918 | info->keep_memory); |
| 7919 | |
| 7920 | reloc_count = (*bed->elf_backend_count_relocs) (sec, relocs); |
| 7921 | |
| 7922 | if (elf_section_data (o)->relocs != relocs) |
| 7923 | free (relocs); |
| 7924 | } |
| 7925 | |
| 7926 | if (sec->rawsize > max_contents_size) |
| 7927 | max_contents_size = sec->rawsize; |
| 7928 | if (sec->size > max_contents_size) |
| 7929 | max_contents_size = sec->size; |
| 7930 | |
| 7931 | /* We are interested in just local symbols, not all |
| 7932 | symbols. */ |
| 7933 | if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour |
| 7934 | && (sec->owner->flags & DYNAMIC) == 0) |
| 7935 | { |
| 7936 | size_t sym_count; |
| 7937 | |
| 7938 | if (elf_bad_symtab (sec->owner)) |
| 7939 | sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size |
| 7940 | / bed->s->sizeof_sym); |
| 7941 | else |
| 7942 | sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info; |
| 7943 | |
| 7944 | if (sym_count > max_sym_count) |
| 7945 | max_sym_count = sym_count; |
| 7946 | |
| 7947 | if (sym_count > max_sym_shndx_count |
| 7948 | && elf_symtab_shndx (sec->owner) != 0) |
| 7949 | max_sym_shndx_count = sym_count; |
| 7950 | |
| 7951 | if ((sec->flags & SEC_RELOC) != 0) |
| 7952 | { |
| 7953 | size_t ext_size; |
| 7954 | |
| 7955 | ext_size = elf_section_data (sec)->rel_hdr.sh_size; |
| 7956 | if (ext_size > max_external_reloc_size) |
| 7957 | max_external_reloc_size = ext_size; |
| 7958 | if (sec->reloc_count > max_internal_reloc_count) |
| 7959 | max_internal_reloc_count = sec->reloc_count; |
| 7960 | } |
| 7961 | } |
| 7962 | } |
| 7963 | |
| 7964 | if (reloc_count == 0) |
| 7965 | continue; |
| 7966 | |
| 7967 | o->reloc_count += reloc_count; |
| 7968 | |
| 7969 | /* MIPS may have a mix of REL and RELA relocs on sections. |
| 7970 | To support this curious ABI we keep reloc counts in |
| 7971 | elf_section_data too. We must be careful to add the |
| 7972 | relocations from the input section to the right output |
| 7973 | count. FIXME: Get rid of one count. We have |
| 7974 | o->reloc_count == esdo->rel_count + esdo->rel_count2. */ |
| 7975 | rel_count1 = &esdo->rel_count; |
| 7976 | if (esdi != NULL) |
| 7977 | { |
| 7978 | bfd_boolean same_size; |
| 7979 | bfd_size_type entsize1; |
| 7980 | |
| 7981 | entsize1 = esdi->rel_hdr.sh_entsize; |
| 7982 | BFD_ASSERT (entsize1 == bed->s->sizeof_rel |
| 7983 | || entsize1 == bed->s->sizeof_rela); |
| 7984 | same_size = !o->use_rela_p == (entsize1 == bed->s->sizeof_rel); |
| 7985 | |
| 7986 | if (!same_size) |
| 7987 | rel_count1 = &esdo->rel_count2; |
| 7988 | |
| 7989 | if (esdi->rel_hdr2 != NULL) |
| 7990 | { |
| 7991 | bfd_size_type entsize2 = esdi->rel_hdr2->sh_entsize; |
| 7992 | unsigned int alt_count; |
| 7993 | unsigned int *rel_count2; |
| 7994 | |
| 7995 | BFD_ASSERT (entsize2 != entsize1 |
| 7996 | && (entsize2 == bed->s->sizeof_rel |
| 7997 | || entsize2 == bed->s->sizeof_rela)); |
| 7998 | |
| 7999 | rel_count2 = &esdo->rel_count2; |
| 8000 | if (!same_size) |
| 8001 | rel_count2 = &esdo->rel_count; |
| 8002 | |
| 8003 | /* The following is probably too simplistic if the |
| 8004 | backend counts output relocs unusually. */ |
| 8005 | BFD_ASSERT (bed->elf_backend_count_relocs == NULL); |
| 8006 | alt_count = NUM_SHDR_ENTRIES (esdi->rel_hdr2); |
| 8007 | *rel_count2 += alt_count; |
| 8008 | reloc_count -= alt_count; |
| 8009 | } |
| 8010 | } |
| 8011 | *rel_count1 += reloc_count; |
| 8012 | } |
| 8013 | |
| 8014 | if (o->reloc_count > 0) |
| 8015 | o->flags |= SEC_RELOC; |
| 8016 | else |
| 8017 | { |
| 8018 | /* Explicitly clear the SEC_RELOC flag. The linker tends to |
| 8019 | set it (this is probably a bug) and if it is set |
| 8020 | assign_section_numbers will create a reloc section. */ |
| 8021 | o->flags &=~ SEC_RELOC; |
| 8022 | } |
| 8023 | |
| 8024 | /* If the SEC_ALLOC flag is not set, force the section VMA to |
| 8025 | zero. This is done in elf_fake_sections as well, but forcing |
| 8026 | the VMA to 0 here will ensure that relocs against these |
| 8027 | sections are handled correctly. */ |
| 8028 | if ((o->flags & SEC_ALLOC) == 0 |
| 8029 | && ! o->user_set_vma) |
| 8030 | o->vma = 0; |
| 8031 | } |
| 8032 | |
| 8033 | if (! info->relocatable && merged) |
| 8034 | elf_link_hash_traverse (elf_hash_table (info), |
| 8035 | _bfd_elf_link_sec_merge_syms, abfd); |
| 8036 | |
| 8037 | /* Figure out the file positions for everything but the symbol table |
| 8038 | and the relocs. We set symcount to force assign_section_numbers |
| 8039 | to create a symbol table. */ |
| 8040 | bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1; |
| 8041 | BFD_ASSERT (! abfd->output_has_begun); |
| 8042 | if (! _bfd_elf_compute_section_file_positions (abfd, info)) |
| 8043 | goto error_return; |
| 8044 | |
| 8045 | /* Set sizes, and assign file positions for reloc sections. */ |
| 8046 | for (o = abfd->sections; o != NULL; o = o->next) |
| 8047 | { |
| 8048 | if ((o->flags & SEC_RELOC) != 0) |
| 8049 | { |
| 8050 | if (!(_bfd_elf_link_size_reloc_section |
| 8051 | (abfd, &elf_section_data (o)->rel_hdr, o))) |
| 8052 | goto error_return; |
| 8053 | |
| 8054 | if (elf_section_data (o)->rel_hdr2 |
| 8055 | && !(_bfd_elf_link_size_reloc_section |
| 8056 | (abfd, elf_section_data (o)->rel_hdr2, o))) |
| 8057 | goto error_return; |
| 8058 | } |
| 8059 | |
| 8060 | /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them |
| 8061 | to count upwards while actually outputting the relocations. */ |
| 8062 | elf_section_data (o)->rel_count = 0; |
| 8063 | elf_section_data (o)->rel_count2 = 0; |
| 8064 | } |
| 8065 | |
| 8066 | _bfd_elf_assign_file_positions_for_relocs (abfd); |
| 8067 | |
| 8068 | /* We have now assigned file positions for all the sections except |
| 8069 | .symtab and .strtab. We start the .symtab section at the current |
| 8070 | file position, and write directly to it. We build the .strtab |
| 8071 | section in memory. */ |
| 8072 | bfd_get_symcount (abfd) = 0; |
| 8073 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 8074 | /* sh_name is set in prep_headers. */ |
| 8075 | symtab_hdr->sh_type = SHT_SYMTAB; |
| 8076 | /* sh_flags, sh_addr and sh_size all start off zero. */ |
| 8077 | symtab_hdr->sh_entsize = bed->s->sizeof_sym; |
| 8078 | /* sh_link is set in assign_section_numbers. */ |
| 8079 | /* sh_info is set below. */ |
| 8080 | /* sh_offset is set just below. */ |
| 8081 | symtab_hdr->sh_addralign = 1 << bed->s->log_file_align; |
| 8082 | |
| 8083 | off = elf_tdata (abfd)->next_file_pos; |
| 8084 | off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE); |
| 8085 | |
| 8086 | /* Note that at this point elf_tdata (abfd)->next_file_pos is |
| 8087 | incorrect. We do not yet know the size of the .symtab section. |
| 8088 | We correct next_file_pos below, after we do know the size. */ |
| 8089 | |
| 8090 | /* Allocate a buffer to hold swapped out symbols. This is to avoid |
| 8091 | continuously seeking to the right position in the file. */ |
| 8092 | if (! info->keep_memory || max_sym_count < 20) |
| 8093 | finfo.symbuf_size = 20; |
| 8094 | else |
| 8095 | finfo.symbuf_size = max_sym_count; |
| 8096 | amt = finfo.symbuf_size; |
| 8097 | amt *= bed->s->sizeof_sym; |
| 8098 | finfo.symbuf = bfd_malloc (amt); |
| 8099 | if (finfo.symbuf == NULL) |
| 8100 | goto error_return; |
| 8101 | if (elf_numsections (abfd) > SHN_LORESERVE) |
| 8102 | { |
| 8103 | /* Wild guess at number of output symbols. realloc'd as needed. */ |
| 8104 | amt = 2 * max_sym_count + elf_numsections (abfd) + 1000; |
| 8105 | finfo.shndxbuf_size = amt; |
| 8106 | amt *= sizeof (Elf_External_Sym_Shndx); |
| 8107 | finfo.symshndxbuf = bfd_zmalloc (amt); |
| 8108 | if (finfo.symshndxbuf == NULL) |
| 8109 | goto error_return; |
| 8110 | } |
| 8111 | |
| 8112 | /* Start writing out the symbol table. The first symbol is always a |
| 8113 | dummy symbol. */ |
| 8114 | if (info->strip != strip_all |
| 8115 | || emit_relocs) |
| 8116 | { |
| 8117 | elfsym.st_value = 0; |
| 8118 | elfsym.st_size = 0; |
| 8119 | elfsym.st_info = 0; |
| 8120 | elfsym.st_other = 0; |
| 8121 | elfsym.st_shndx = SHN_UNDEF; |
| 8122 | if (! elf_link_output_sym (&finfo, NULL, &elfsym, bfd_und_section_ptr, |
| 8123 | NULL)) |
| 8124 | goto error_return; |
| 8125 | } |
| 8126 | |
| 8127 | /* Output a symbol for each section. We output these even if we are |
| 8128 | discarding local symbols, since they are used for relocs. These |
| 8129 | symbols have no names. We store the index of each one in the |
| 8130 | index field of the section, so that we can find it again when |
| 8131 | outputting relocs. */ |
| 8132 | if (info->strip != strip_all |
| 8133 | || emit_relocs) |
| 8134 | { |
| 8135 | elfsym.st_size = 0; |
| 8136 | elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION); |
| 8137 | elfsym.st_other = 0; |
| 8138 | elfsym.st_value = 0; |
| 8139 | for (i = 1; i < elf_numsections (abfd); i++) |
| 8140 | { |
| 8141 | o = bfd_section_from_elf_index (abfd, i); |
| 8142 | if (o != NULL) |
| 8143 | { |
| 8144 | o->target_index = bfd_get_symcount (abfd); |
| 8145 | elfsym.st_shndx = i; |
| 8146 | if (!info->relocatable) |
| 8147 | elfsym.st_value = o->vma; |
| 8148 | if (!elf_link_output_sym (&finfo, NULL, &elfsym, o, NULL)) |
| 8149 | goto error_return; |
| 8150 | } |
| 8151 | if (i == SHN_LORESERVE - 1) |
| 8152 | i += SHN_HIRESERVE + 1 - SHN_LORESERVE; |
| 8153 | } |
| 8154 | } |
| 8155 | |
| 8156 | /* Allocate some memory to hold information read in from the input |
| 8157 | files. */ |
| 8158 | if (max_contents_size != 0) |
| 8159 | { |
| 8160 | finfo.contents = bfd_malloc (max_contents_size); |
| 8161 | if (finfo.contents == NULL) |
| 8162 | goto error_return; |
| 8163 | } |
| 8164 | |
| 8165 | if (max_external_reloc_size != 0) |
| 8166 | { |
| 8167 | finfo.external_relocs = bfd_malloc (max_external_reloc_size); |
| 8168 | if (finfo.external_relocs == NULL) |
| 8169 | goto error_return; |
| 8170 | } |
| 8171 | |
| 8172 | if (max_internal_reloc_count != 0) |
| 8173 | { |
| 8174 | amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel; |
| 8175 | amt *= sizeof (Elf_Internal_Rela); |
| 8176 | finfo.internal_relocs = bfd_malloc (amt); |
| 8177 | if (finfo.internal_relocs == NULL) |
| 8178 | goto error_return; |
| 8179 | } |
| 8180 | |
| 8181 | if (max_sym_count != 0) |
| 8182 | { |
| 8183 | amt = max_sym_count * bed->s->sizeof_sym; |
| 8184 | finfo.external_syms = bfd_malloc (amt); |
| 8185 | if (finfo.external_syms == NULL) |
| 8186 | goto error_return; |
| 8187 | |
| 8188 | amt = max_sym_count * sizeof (Elf_Internal_Sym); |
| 8189 | finfo.internal_syms = bfd_malloc (amt); |
| 8190 | if (finfo.internal_syms == NULL) |
| 8191 | goto error_return; |
| 8192 | |
| 8193 | amt = max_sym_count * sizeof (long); |
| 8194 | finfo.indices = bfd_malloc (amt); |
| 8195 | if (finfo.indices == NULL) |
| 8196 | goto error_return; |
| 8197 | |
| 8198 | amt = max_sym_count * sizeof (asection *); |
| 8199 | finfo.sections = bfd_malloc (amt); |
| 8200 | if (finfo.sections == NULL) |
| 8201 | goto error_return; |
| 8202 | } |
| 8203 | |
| 8204 | if (max_sym_shndx_count != 0) |
| 8205 | { |
| 8206 | amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx); |
| 8207 | finfo.locsym_shndx = bfd_malloc (amt); |
| 8208 | if (finfo.locsym_shndx == NULL) |
| 8209 | goto error_return; |
| 8210 | } |
| 8211 | |
| 8212 | if (elf_hash_table (info)->tls_sec) |
| 8213 | { |
| 8214 | bfd_vma base, end = 0; |
| 8215 | asection *sec; |
| 8216 | |
| 8217 | for (sec = elf_hash_table (info)->tls_sec; |
| 8218 | sec && (sec->flags & SEC_THREAD_LOCAL); |
| 8219 | sec = sec->next) |
| 8220 | { |
| 8221 | bfd_size_type size = sec->size; |
| 8222 | |
| 8223 | if (size == 0 |
| 8224 | && (sec->flags & SEC_HAS_CONTENTS) == 0) |
| 8225 | { |
| 8226 | struct bfd_link_order *o = sec->map_tail.link_order; |
| 8227 | if (o != NULL) |
| 8228 | size = o->offset + o->size; |
| 8229 | } |
| 8230 | end = sec->vma + size; |
| 8231 | } |
| 8232 | base = elf_hash_table (info)->tls_sec->vma; |
| 8233 | end = align_power (end, elf_hash_table (info)->tls_sec->alignment_power); |
| 8234 | elf_hash_table (info)->tls_size = end - base; |
| 8235 | } |
| 8236 | |
| 8237 | /* Reorder SHF_LINK_ORDER sections. */ |
| 8238 | for (o = abfd->sections; o != NULL; o = o->next) |
| 8239 | { |
| 8240 | if (!elf_fixup_link_order (abfd, o)) |
| 8241 | return FALSE; |
| 8242 | } |
| 8243 | |
| 8244 | /* Since ELF permits relocations to be against local symbols, we |
| 8245 | must have the local symbols available when we do the relocations. |
| 8246 | Since we would rather only read the local symbols once, and we |
| 8247 | would rather not keep them in memory, we handle all the |
| 8248 | relocations for a single input file at the same time. |
| 8249 | |
| 8250 | Unfortunately, there is no way to know the total number of local |
| 8251 | symbols until we have seen all of them, and the local symbol |
| 8252 | indices precede the global symbol indices. This means that when |
| 8253 | we are generating relocatable output, and we see a reloc against |
| 8254 | a global symbol, we can not know the symbol index until we have |
| 8255 | finished examining all the local symbols to see which ones we are |
| 8256 | going to output. To deal with this, we keep the relocations in |
| 8257 | memory, and don't output them until the end of the link. This is |
| 8258 | an unfortunate waste of memory, but I don't see a good way around |
| 8259 | it. Fortunately, it only happens when performing a relocatable |
| 8260 | link, which is not the common case. FIXME: If keep_memory is set |
| 8261 | we could write the relocs out and then read them again; I don't |
| 8262 | know how bad the memory loss will be. */ |
| 8263 | |
| 8264 | for (sub = info->input_bfds; sub != NULL; sub = sub->link_next) |
| 8265 | sub->output_has_begun = FALSE; |
| 8266 | for (o = abfd->sections; o != NULL; o = o->next) |
| 8267 | { |
| 8268 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 8269 | { |
| 8270 | if (p->type == bfd_indirect_link_order |
| 8271 | && (bfd_get_flavour ((sub = p->u.indirect.section->owner)) |
| 8272 | == bfd_target_elf_flavour) |
| 8273 | && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass) |
| 8274 | { |
| 8275 | if (! sub->output_has_begun) |
| 8276 | { |
| 8277 | if (! elf_link_input_bfd (&finfo, sub)) |
| 8278 | goto error_return; |
| 8279 | sub->output_has_begun = TRUE; |
| 8280 | } |
| 8281 | } |
| 8282 | else if (p->type == bfd_section_reloc_link_order |
| 8283 | || p->type == bfd_symbol_reloc_link_order) |
| 8284 | { |
| 8285 | if (! elf_reloc_link_order (abfd, info, o, p)) |
| 8286 | goto error_return; |
| 8287 | } |
| 8288 | else |
| 8289 | { |
| 8290 | if (! _bfd_default_link_order (abfd, info, o, p)) |
| 8291 | goto error_return; |
| 8292 | } |
| 8293 | } |
| 8294 | } |
| 8295 | |
| 8296 | /* Output any global symbols that got converted to local in a |
| 8297 | version script or due to symbol visibility. We do this in a |
| 8298 | separate step since ELF requires all local symbols to appear |
| 8299 | prior to any global symbols. FIXME: We should only do this if |
| 8300 | some global symbols were, in fact, converted to become local. |
| 8301 | FIXME: Will this work correctly with the Irix 5 linker? */ |
| 8302 | eoinfo.failed = FALSE; |
| 8303 | eoinfo.finfo = &finfo; |
| 8304 | eoinfo.localsyms = TRUE; |
| 8305 | elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym, |
| 8306 | &eoinfo); |
| 8307 | if (eoinfo.failed) |
| 8308 | return FALSE; |
| 8309 | |
| 8310 | /* If backend needs to output some local symbols not present in the hash |
| 8311 | table, do it now. */ |
| 8312 | if (bed->elf_backend_output_arch_local_syms) |
| 8313 | { |
| 8314 | typedef bfd_boolean (*out_sym_func) |
| 8315 | (void *, const char *, Elf_Internal_Sym *, asection *, |
| 8316 | struct elf_link_hash_entry *); |
| 8317 | |
| 8318 | if (! ((*bed->elf_backend_output_arch_local_syms) |
| 8319 | (abfd, info, &finfo, (out_sym_func) elf_link_output_sym))) |
| 8320 | return FALSE; |
| 8321 | } |
| 8322 | |
| 8323 | /* That wrote out all the local symbols. Finish up the symbol table |
| 8324 | with the global symbols. Even if we want to strip everything we |
| 8325 | can, we still need to deal with those global symbols that got |
| 8326 | converted to local in a version script. */ |
| 8327 | |
| 8328 | /* The sh_info field records the index of the first non local symbol. */ |
| 8329 | symtab_hdr->sh_info = bfd_get_symcount (abfd); |
| 8330 | |
| 8331 | if (dynamic |
| 8332 | && finfo.dynsym_sec->output_section != bfd_abs_section_ptr) |
| 8333 | { |
| 8334 | Elf_Internal_Sym sym; |
| 8335 | bfd_byte *dynsym = finfo.dynsym_sec->contents; |
| 8336 | long last_local = 0; |
| 8337 | |
| 8338 | /* Write out the section symbols for the output sections. */ |
| 8339 | if (info->shared || elf_hash_table (info)->is_relocatable_executable) |
| 8340 | { |
| 8341 | asection *s; |
| 8342 | |
| 8343 | sym.st_size = 0; |
| 8344 | sym.st_name = 0; |
| 8345 | sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION); |
| 8346 | sym.st_other = 0; |
| 8347 | |
| 8348 | for (s = abfd->sections; s != NULL; s = s->next) |
| 8349 | { |
| 8350 | int indx; |
| 8351 | bfd_byte *dest; |
| 8352 | long dynindx; |
| 8353 | |
| 8354 | dynindx = elf_section_data (s)->dynindx; |
| 8355 | if (dynindx <= 0) |
| 8356 | continue; |
| 8357 | indx = elf_section_data (s)->this_idx; |
| 8358 | BFD_ASSERT (indx > 0); |
| 8359 | sym.st_shndx = indx; |
| 8360 | if (! check_dynsym (abfd, &sym)) |
| 8361 | return FALSE; |
| 8362 | sym.st_value = s->vma; |
| 8363 | dest = dynsym + dynindx * bed->s->sizeof_sym; |
| 8364 | if (last_local < dynindx) |
| 8365 | last_local = dynindx; |
| 8366 | bed->s->swap_symbol_out (abfd, &sym, dest, 0); |
| 8367 | } |
| 8368 | } |
| 8369 | |
| 8370 | /* Write out the local dynsyms. */ |
| 8371 | if (elf_hash_table (info)->dynlocal) |
| 8372 | { |
| 8373 | struct elf_link_local_dynamic_entry *e; |
| 8374 | for (e = elf_hash_table (info)->dynlocal; e ; e = e->next) |
| 8375 | { |
| 8376 | asection *s; |
| 8377 | bfd_byte *dest; |
| 8378 | |
| 8379 | sym.st_size = e->isym.st_size; |
| 8380 | sym.st_other = e->isym.st_other; |
| 8381 | |
| 8382 | /* Copy the internal symbol as is. |
| 8383 | Note that we saved a word of storage and overwrote |
| 8384 | the original st_name with the dynstr_index. */ |
| 8385 | sym = e->isym; |
| 8386 | |
| 8387 | if (e->isym.st_shndx != SHN_UNDEF |
| 8388 | && (e->isym.st_shndx < SHN_LORESERVE |
| 8389 | || e->isym.st_shndx > SHN_HIRESERVE)) |
| 8390 | { |
| 8391 | s = bfd_section_from_elf_index (e->input_bfd, |
| 8392 | e->isym.st_shndx); |
| 8393 | |
| 8394 | sym.st_shndx = |
| 8395 | elf_section_data (s->output_section)->this_idx; |
| 8396 | if (! check_dynsym (abfd, &sym)) |
| 8397 | return FALSE; |
| 8398 | sym.st_value = (s->output_section->vma |
| 8399 | + s->output_offset |
| 8400 | + e->isym.st_value); |
| 8401 | } |
| 8402 | |
| 8403 | if (last_local < e->dynindx) |
| 8404 | last_local = e->dynindx; |
| 8405 | |
| 8406 | dest = dynsym + e->dynindx * bed->s->sizeof_sym; |
| 8407 | bed->s->swap_symbol_out (abfd, &sym, dest, 0); |
| 8408 | } |
| 8409 | } |
| 8410 | |
| 8411 | elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info = |
| 8412 | last_local + 1; |
| 8413 | } |
| 8414 | |
| 8415 | /* We get the global symbols from the hash table. */ |
| 8416 | eoinfo.failed = FALSE; |
| 8417 | eoinfo.localsyms = FALSE; |
| 8418 | eoinfo.finfo = &finfo; |
| 8419 | elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym, |
| 8420 | &eoinfo); |
| 8421 | if (eoinfo.failed) |
| 8422 | return FALSE; |
| 8423 | |
| 8424 | /* If backend needs to output some symbols not present in the hash |
| 8425 | table, do it now. */ |
| 8426 | if (bed->elf_backend_output_arch_syms) |
| 8427 | { |
| 8428 | typedef bfd_boolean (*out_sym_func) |
| 8429 | (void *, const char *, Elf_Internal_Sym *, asection *, |
| 8430 | struct elf_link_hash_entry *); |
| 8431 | |
| 8432 | if (! ((*bed->elf_backend_output_arch_syms) |
| 8433 | (abfd, info, &finfo, (out_sym_func) elf_link_output_sym))) |
| 8434 | return FALSE; |
| 8435 | } |
| 8436 | |
| 8437 | /* Flush all symbols to the file. */ |
| 8438 | if (! elf_link_flush_output_syms (&finfo, bed)) |
| 8439 | return FALSE; |
| 8440 | |
| 8441 | /* Now we know the size of the symtab section. */ |
| 8442 | off += symtab_hdr->sh_size; |
| 8443 | |
| 8444 | symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr; |
| 8445 | if (symtab_shndx_hdr->sh_name != 0) |
| 8446 | { |
| 8447 | symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX; |
| 8448 | symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx); |
| 8449 | symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx); |
| 8450 | amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx); |
| 8451 | symtab_shndx_hdr->sh_size = amt; |
| 8452 | |
| 8453 | off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr, |
| 8454 | off, TRUE); |
| 8455 | |
| 8456 | if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0 |
| 8457 | || (bfd_bwrite (finfo.symshndxbuf, amt, abfd) != amt)) |
| 8458 | return FALSE; |
| 8459 | } |
| 8460 | |
| 8461 | |
| 8462 | /* Finish up and write out the symbol string table (.strtab) |
| 8463 | section. */ |
| 8464 | symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr; |
| 8465 | /* sh_name was set in prep_headers. */ |
| 8466 | symstrtab_hdr->sh_type = SHT_STRTAB; |
| 8467 | symstrtab_hdr->sh_flags = 0; |
| 8468 | symstrtab_hdr->sh_addr = 0; |
| 8469 | symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab); |
| 8470 | symstrtab_hdr->sh_entsize = 0; |
| 8471 | symstrtab_hdr->sh_link = 0; |
| 8472 | symstrtab_hdr->sh_info = 0; |
| 8473 | /* sh_offset is set just below. */ |
| 8474 | symstrtab_hdr->sh_addralign = 1; |
| 8475 | |
| 8476 | off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE); |
| 8477 | elf_tdata (abfd)->next_file_pos = off; |
| 8478 | |
| 8479 | if (bfd_get_symcount (abfd) > 0) |
| 8480 | { |
| 8481 | if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0 |
| 8482 | || ! _bfd_stringtab_emit (abfd, finfo.symstrtab)) |
| 8483 | return FALSE; |
| 8484 | } |
| 8485 | |
| 8486 | /* Adjust the relocs to have the correct symbol indices. */ |
| 8487 | for (o = abfd->sections; o != NULL; o = o->next) |
| 8488 | { |
| 8489 | if ((o->flags & SEC_RELOC) == 0) |
| 8490 | continue; |
| 8491 | |
| 8492 | elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr, |
| 8493 | elf_section_data (o)->rel_count, |
| 8494 | elf_section_data (o)->rel_hashes); |
| 8495 | if (elf_section_data (o)->rel_hdr2 != NULL) |
| 8496 | elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2, |
| 8497 | elf_section_data (o)->rel_count2, |
| 8498 | (elf_section_data (o)->rel_hashes |
| 8499 | + elf_section_data (o)->rel_count)); |
| 8500 | |
| 8501 | /* Set the reloc_count field to 0 to prevent write_relocs from |
| 8502 | trying to swap the relocs out itself. */ |
| 8503 | o->reloc_count = 0; |
| 8504 | } |
| 8505 | |
| 8506 | if (dynamic && info->combreloc && dynobj != NULL) |
| 8507 | relativecount = elf_link_sort_relocs (abfd, info, &reldyn); |
| 8508 | |
| 8509 | /* If we are linking against a dynamic object, or generating a |
| 8510 | shared library, finish up the dynamic linking information. */ |
| 8511 | if (dynamic) |
| 8512 | { |
| 8513 | bfd_byte *dyncon, *dynconend; |
| 8514 | |
| 8515 | /* Fix up .dynamic entries. */ |
| 8516 | o = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 8517 | BFD_ASSERT (o != NULL); |
| 8518 | |
| 8519 | dyncon = o->contents; |
| 8520 | dynconend = o->contents + o->size; |
| 8521 | for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn) |
| 8522 | { |
| 8523 | Elf_Internal_Dyn dyn; |
| 8524 | const char *name; |
| 8525 | unsigned int type; |
| 8526 | |
| 8527 | bed->s->swap_dyn_in (dynobj, dyncon, &dyn); |
| 8528 | |
| 8529 | switch (dyn.d_tag) |
| 8530 | { |
| 8531 | default: |
| 8532 | continue; |
| 8533 | case DT_NULL: |
| 8534 | if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend) |
| 8535 | { |
| 8536 | switch (elf_section_data (reldyn)->this_hdr.sh_type) |
| 8537 | { |
| 8538 | case SHT_REL: dyn.d_tag = DT_RELCOUNT; break; |
| 8539 | case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break; |
| 8540 | default: continue; |
| 8541 | } |
| 8542 | dyn.d_un.d_val = relativecount; |
| 8543 | relativecount = 0; |
| 8544 | break; |
| 8545 | } |
| 8546 | continue; |
| 8547 | |
| 8548 | case DT_INIT: |
| 8549 | name = info->init_function; |
| 8550 | goto get_sym; |
| 8551 | case DT_FINI: |
| 8552 | name = info->fini_function; |
| 8553 | get_sym: |
| 8554 | { |
| 8555 | struct elf_link_hash_entry *h; |
| 8556 | |
| 8557 | h = elf_link_hash_lookup (elf_hash_table (info), name, |
| 8558 | FALSE, FALSE, TRUE); |
| 8559 | if (h != NULL |
| 8560 | && (h->root.type == bfd_link_hash_defined |
| 8561 | || h->root.type == bfd_link_hash_defweak)) |
| 8562 | { |
| 8563 | dyn.d_un.d_val = h->root.u.def.value; |
| 8564 | o = h->root.u.def.section; |
| 8565 | if (o->output_section != NULL) |
| 8566 | dyn.d_un.d_val += (o->output_section->vma |
| 8567 | + o->output_offset); |
| 8568 | else |
| 8569 | { |
| 8570 | /* The symbol is imported from another shared |
| 8571 | library and does not apply to this one. */ |
| 8572 | dyn.d_un.d_val = 0; |
| 8573 | } |
| 8574 | break; |
| 8575 | } |
| 8576 | } |
| 8577 | continue; |
| 8578 | |
| 8579 | case DT_PREINIT_ARRAYSZ: |
| 8580 | name = ".preinit_array"; |
| 8581 | goto get_size; |
| 8582 | case DT_INIT_ARRAYSZ: |
| 8583 | name = ".init_array"; |
| 8584 | goto get_size; |
| 8585 | case DT_FINI_ARRAYSZ: |
| 8586 | name = ".fini_array"; |
| 8587 | get_size: |
| 8588 | o = bfd_get_section_by_name (abfd, name); |
| 8589 | if (o == NULL) |
| 8590 | { |
| 8591 | (*_bfd_error_handler) |
| 8592 | (_("%B: could not find output section %s"), abfd, name); |
| 8593 | goto error_return; |
| 8594 | } |
| 8595 | if (o->size == 0) |
| 8596 | (*_bfd_error_handler) |
| 8597 | (_("warning: %s section has zero size"), name); |
| 8598 | dyn.d_un.d_val = o->size; |
| 8599 | break; |
| 8600 | |
| 8601 | case DT_PREINIT_ARRAY: |
| 8602 | name = ".preinit_array"; |
| 8603 | goto get_vma; |
| 8604 | case DT_INIT_ARRAY: |
| 8605 | name = ".init_array"; |
| 8606 | goto get_vma; |
| 8607 | case DT_FINI_ARRAY: |
| 8608 | name = ".fini_array"; |
| 8609 | goto get_vma; |
| 8610 | |
| 8611 | case DT_HASH: |
| 8612 | name = ".hash"; |
| 8613 | goto get_vma; |
| 8614 | case DT_STRTAB: |
| 8615 | name = ".dynstr"; |
| 8616 | goto get_vma; |
| 8617 | case DT_SYMTAB: |
| 8618 | name = ".dynsym"; |
| 8619 | goto get_vma; |
| 8620 | case DT_VERDEF: |
| 8621 | name = ".gnu.version_d"; |
| 8622 | goto get_vma; |
| 8623 | case DT_VERNEED: |
| 8624 | name = ".gnu.version_r"; |
| 8625 | goto get_vma; |
| 8626 | case DT_VERSYM: |
| 8627 | name = ".gnu.version"; |
| 8628 | get_vma: |
| 8629 | o = bfd_get_section_by_name (abfd, name); |
| 8630 | if (o == NULL) |
| 8631 | { |
| 8632 | (*_bfd_error_handler) |
| 8633 | (_("%B: could not find output section %s"), abfd, name); |
| 8634 | goto error_return; |
| 8635 | } |
| 8636 | dyn.d_un.d_ptr = o->vma; |
| 8637 | break; |
| 8638 | |
| 8639 | case DT_REL: |
| 8640 | case DT_RELA: |
| 8641 | case DT_RELSZ: |
| 8642 | case DT_RELASZ: |
| 8643 | if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ) |
| 8644 | type = SHT_REL; |
| 8645 | else |
| 8646 | type = SHT_RELA; |
| 8647 | dyn.d_un.d_val = 0; |
| 8648 | for (i = 1; i < elf_numsections (abfd); i++) |
| 8649 | { |
| 8650 | Elf_Internal_Shdr *hdr; |
| 8651 | |
| 8652 | hdr = elf_elfsections (abfd)[i]; |
| 8653 | if (hdr->sh_type == type |
| 8654 | && (hdr->sh_flags & SHF_ALLOC) != 0) |
| 8655 | { |
| 8656 | if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ) |
| 8657 | dyn.d_un.d_val += hdr->sh_size; |
| 8658 | else |
| 8659 | { |
| 8660 | if (dyn.d_un.d_val == 0 |
| 8661 | || hdr->sh_addr < dyn.d_un.d_val) |
| 8662 | dyn.d_un.d_val = hdr->sh_addr; |
| 8663 | } |
| 8664 | } |
| 8665 | } |
| 8666 | break; |
| 8667 | } |
| 8668 | bed->s->swap_dyn_out (dynobj, &dyn, dyncon); |
| 8669 | } |
| 8670 | } |
| 8671 | |
| 8672 | /* If we have created any dynamic sections, then output them. */ |
| 8673 | if (dynobj != NULL) |
| 8674 | { |
| 8675 | if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info)) |
| 8676 | goto error_return; |
| 8677 | |
| 8678 | /* Check for DT_TEXTREL (late, in case the backend removes it). */ |
| 8679 | if (info->warn_shared_textrel && info->shared) |
| 8680 | { |
| 8681 | bfd_byte *dyncon, *dynconend; |
| 8682 | |
| 8683 | /* Fix up .dynamic entries. */ |
| 8684 | o = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 8685 | BFD_ASSERT (o != NULL); |
| 8686 | |
| 8687 | dyncon = o->contents; |
| 8688 | dynconend = o->contents + o->size; |
| 8689 | for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn) |
| 8690 | { |
| 8691 | Elf_Internal_Dyn dyn; |
| 8692 | |
| 8693 | bed->s->swap_dyn_in (dynobj, dyncon, &dyn); |
| 8694 | |
| 8695 | if (dyn.d_tag == DT_TEXTREL) |
| 8696 | { |
| 8697 | _bfd_error_handler |
| 8698 | (_("warning: creating a DT_TEXTREL in a shared object.")); |
| 8699 | break; |
| 8700 | } |
| 8701 | } |
| 8702 | } |
| 8703 | |
| 8704 | for (o = dynobj->sections; o != NULL; o = o->next) |
| 8705 | { |
| 8706 | if ((o->flags & SEC_HAS_CONTENTS) == 0 |
| 8707 | || o->size == 0 |
| 8708 | || o->output_section == bfd_abs_section_ptr) |
| 8709 | continue; |
| 8710 | if ((o->flags & SEC_LINKER_CREATED) == 0) |
| 8711 | { |
| 8712 | /* At this point, we are only interested in sections |
| 8713 | created by _bfd_elf_link_create_dynamic_sections. */ |
| 8714 | continue; |
| 8715 | } |
| 8716 | if (elf_hash_table (info)->stab_info.stabstr == o) |
| 8717 | continue; |
| 8718 | if (elf_hash_table (info)->eh_info.hdr_sec == o) |
| 8719 | continue; |
| 8720 | if ((elf_section_data (o->output_section)->this_hdr.sh_type |
| 8721 | != SHT_STRTAB) |
| 8722 | || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0) |
| 8723 | { |
| 8724 | if (! bfd_set_section_contents (abfd, o->output_section, |
| 8725 | o->contents, |
| 8726 | (file_ptr) o->output_offset, |
| 8727 | o->size)) |
| 8728 | goto error_return; |
| 8729 | } |
| 8730 | else |
| 8731 | { |
| 8732 | /* The contents of the .dynstr section are actually in a |
| 8733 | stringtab. */ |
| 8734 | off = elf_section_data (o->output_section)->this_hdr.sh_offset; |
| 8735 | if (bfd_seek (abfd, off, SEEK_SET) != 0 |
| 8736 | || ! _bfd_elf_strtab_emit (abfd, |
| 8737 | elf_hash_table (info)->dynstr)) |
| 8738 | goto error_return; |
| 8739 | } |
| 8740 | } |
| 8741 | } |
| 8742 | |
| 8743 | if (info->relocatable) |
| 8744 | { |
| 8745 | bfd_boolean failed = FALSE; |
| 8746 | |
| 8747 | bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed); |
| 8748 | if (failed) |
| 8749 | goto error_return; |
| 8750 | } |
| 8751 | |
| 8752 | /* If we have optimized stabs strings, output them. */ |
| 8753 | if (elf_hash_table (info)->stab_info.stabstr != NULL) |
| 8754 | { |
| 8755 | if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info)) |
| 8756 | goto error_return; |
| 8757 | } |
| 8758 | |
| 8759 | if (info->eh_frame_hdr) |
| 8760 | { |
| 8761 | if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info)) |
| 8762 | goto error_return; |
| 8763 | } |
| 8764 | |
| 8765 | if (finfo.symstrtab != NULL) |
| 8766 | _bfd_stringtab_free (finfo.symstrtab); |
| 8767 | if (finfo.contents != NULL) |
| 8768 | free (finfo.contents); |
| 8769 | if (finfo.external_relocs != NULL) |
| 8770 | free (finfo.external_relocs); |
| 8771 | if (finfo.internal_relocs != NULL) |
| 8772 | free (finfo.internal_relocs); |
| 8773 | if (finfo.external_syms != NULL) |
| 8774 | free (finfo.external_syms); |
| 8775 | if (finfo.locsym_shndx != NULL) |
| 8776 | free (finfo.locsym_shndx); |
| 8777 | if (finfo.internal_syms != NULL) |
| 8778 | free (finfo.internal_syms); |
| 8779 | if (finfo.indices != NULL) |
| 8780 | free (finfo.indices); |
| 8781 | if (finfo.sections != NULL) |
| 8782 | free (finfo.sections); |
| 8783 | if (finfo.symbuf != NULL) |
| 8784 | free (finfo.symbuf); |
| 8785 | if (finfo.symshndxbuf != NULL) |
| 8786 | free (finfo.symshndxbuf); |
| 8787 | for (o = abfd->sections; o != NULL; o = o->next) |
| 8788 | { |
| 8789 | if ((o->flags & SEC_RELOC) != 0 |
| 8790 | && elf_section_data (o)->rel_hashes != NULL) |
| 8791 | free (elf_section_data (o)->rel_hashes); |
| 8792 | } |
| 8793 | |
| 8794 | elf_tdata (abfd)->linker = TRUE; |
| 8795 | |
| 8796 | return TRUE; |
| 8797 | |
| 8798 | error_return: |
| 8799 | if (finfo.symstrtab != NULL) |
| 8800 | _bfd_stringtab_free (finfo.symstrtab); |
| 8801 | if (finfo.contents != NULL) |
| 8802 | free (finfo.contents); |
| 8803 | if (finfo.external_relocs != NULL) |
| 8804 | free (finfo.external_relocs); |
| 8805 | if (finfo.internal_relocs != NULL) |
| 8806 | free (finfo.internal_relocs); |
| 8807 | if (finfo.external_syms != NULL) |
| 8808 | free (finfo.external_syms); |
| 8809 | if (finfo.locsym_shndx != NULL) |
| 8810 | free (finfo.locsym_shndx); |
| 8811 | if (finfo.internal_syms != NULL) |
| 8812 | free (finfo.internal_syms); |
| 8813 | if (finfo.indices != NULL) |
| 8814 | free (finfo.indices); |
| 8815 | if (finfo.sections != NULL) |
| 8816 | free (finfo.sections); |
| 8817 | if (finfo.symbuf != NULL) |
| 8818 | free (finfo.symbuf); |
| 8819 | if (finfo.symshndxbuf != NULL) |
| 8820 | free (finfo.symshndxbuf); |
| 8821 | for (o = abfd->sections; o != NULL; o = o->next) |
| 8822 | { |
| 8823 | if ((o->flags & SEC_RELOC) != 0 |
| 8824 | && elf_section_data (o)->rel_hashes != NULL) |
| 8825 | free (elf_section_data (o)->rel_hashes); |
| 8826 | } |
| 8827 | |
| 8828 | return FALSE; |
| 8829 | } |
| 8830 | \f |
| 8831 | /* Garbage collect unused sections. */ |
| 8832 | |
| 8833 | /* The mark phase of garbage collection. For a given section, mark |
| 8834 | it and any sections in this section's group, and all the sections |
| 8835 | which define symbols to which it refers. */ |
| 8836 | |
| 8837 | typedef asection * (*gc_mark_hook_fn) |
| 8838 | (asection *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 8839 | struct elf_link_hash_entry *, Elf_Internal_Sym *); |
| 8840 | |
| 8841 | bfd_boolean |
| 8842 | _bfd_elf_gc_mark (struct bfd_link_info *info, |
| 8843 | asection *sec, |
| 8844 | gc_mark_hook_fn gc_mark_hook) |
| 8845 | { |
| 8846 | bfd_boolean ret; |
| 8847 | bfd_boolean is_eh; |
| 8848 | asection *group_sec; |
| 8849 | |
| 8850 | sec->gc_mark = 1; |
| 8851 | |
| 8852 | /* Mark all the sections in the group. */ |
| 8853 | group_sec = elf_section_data (sec)->next_in_group; |
| 8854 | if (group_sec && !group_sec->gc_mark) |
| 8855 | if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook)) |
| 8856 | return FALSE; |
| 8857 | |
| 8858 | /* Look through the section relocs. */ |
| 8859 | ret = TRUE; |
| 8860 | is_eh = strcmp (sec->name, ".eh_frame") == 0; |
| 8861 | if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0) |
| 8862 | { |
| 8863 | Elf_Internal_Rela *relstart, *rel, *relend; |
| 8864 | Elf_Internal_Shdr *symtab_hdr; |
| 8865 | struct elf_link_hash_entry **sym_hashes; |
| 8866 | size_t nlocsyms; |
| 8867 | size_t extsymoff; |
| 8868 | bfd *input_bfd = sec->owner; |
| 8869 | const struct elf_backend_data *bed = get_elf_backend_data (input_bfd); |
| 8870 | Elf_Internal_Sym *isym = NULL; |
| 8871 | int r_sym_shift; |
| 8872 | |
| 8873 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 8874 | sym_hashes = elf_sym_hashes (input_bfd); |
| 8875 | |
| 8876 | /* Read the local symbols. */ |
| 8877 | if (elf_bad_symtab (input_bfd)) |
| 8878 | { |
| 8879 | nlocsyms = symtab_hdr->sh_size / bed->s->sizeof_sym; |
| 8880 | extsymoff = 0; |
| 8881 | } |
| 8882 | else |
| 8883 | extsymoff = nlocsyms = symtab_hdr->sh_info; |
| 8884 | |
| 8885 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 8886 | if (isym == NULL && nlocsyms != 0) |
| 8887 | { |
| 8888 | isym = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, nlocsyms, 0, |
| 8889 | NULL, NULL, NULL); |
| 8890 | if (isym == NULL) |
| 8891 | return FALSE; |
| 8892 | } |
| 8893 | |
| 8894 | /* Read the relocations. */ |
| 8895 | relstart = _bfd_elf_link_read_relocs (input_bfd, sec, NULL, NULL, |
| 8896 | info->keep_memory); |
| 8897 | if (relstart == NULL) |
| 8898 | { |
| 8899 | ret = FALSE; |
| 8900 | goto out1; |
| 8901 | } |
| 8902 | relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel; |
| 8903 | |
| 8904 | if (bed->s->arch_size == 32) |
| 8905 | r_sym_shift = 8; |
| 8906 | else |
| 8907 | r_sym_shift = 32; |
| 8908 | |
| 8909 | for (rel = relstart; rel < relend; rel++) |
| 8910 | { |
| 8911 | unsigned long r_symndx; |
| 8912 | asection *rsec; |
| 8913 | struct elf_link_hash_entry *h; |
| 8914 | |
| 8915 | r_symndx = rel->r_info >> r_sym_shift; |
| 8916 | if (r_symndx == 0) |
| 8917 | continue; |
| 8918 | |
| 8919 | if (r_symndx >= nlocsyms |
| 8920 | || ELF_ST_BIND (isym[r_symndx].st_info) != STB_LOCAL) |
| 8921 | { |
| 8922 | h = sym_hashes[r_symndx - extsymoff]; |
| 8923 | while (h->root.type == bfd_link_hash_indirect |
| 8924 | || h->root.type == bfd_link_hash_warning) |
| 8925 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 8926 | rsec = (*gc_mark_hook) (sec, info, rel, h, NULL); |
| 8927 | } |
| 8928 | else |
| 8929 | { |
| 8930 | rsec = (*gc_mark_hook) (sec, info, rel, NULL, &isym[r_symndx]); |
| 8931 | } |
| 8932 | |
| 8933 | if (rsec && !rsec->gc_mark) |
| 8934 | { |
| 8935 | if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour) |
| 8936 | rsec->gc_mark = 1; |
| 8937 | else if (is_eh) |
| 8938 | rsec->gc_mark_from_eh = 1; |
| 8939 | else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook)) |
| 8940 | { |
| 8941 | ret = FALSE; |
| 8942 | goto out2; |
| 8943 | } |
| 8944 | } |
| 8945 | } |
| 8946 | |
| 8947 | out2: |
| 8948 | if (elf_section_data (sec)->relocs != relstart) |
| 8949 | free (relstart); |
| 8950 | out1: |
| 8951 | if (isym != NULL && symtab_hdr->contents != (unsigned char *) isym) |
| 8952 | { |
| 8953 | if (! info->keep_memory) |
| 8954 | free (isym); |
| 8955 | else |
| 8956 | symtab_hdr->contents = (unsigned char *) isym; |
| 8957 | } |
| 8958 | } |
| 8959 | |
| 8960 | return ret; |
| 8961 | } |
| 8962 | |
| 8963 | /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */ |
| 8964 | |
| 8965 | struct elf_gc_sweep_symbol_info { |
| 8966 | struct bfd_link_info *info; |
| 8967 | void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *, |
| 8968 | bfd_boolean); |
| 8969 | }; |
| 8970 | |
| 8971 | static bfd_boolean |
| 8972 | elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data) |
| 8973 | { |
| 8974 | if (h->root.type == bfd_link_hash_warning) |
| 8975 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 8976 | |
| 8977 | if ((h->root.type == bfd_link_hash_defined |
| 8978 | || h->root.type == bfd_link_hash_defweak) |
| 8979 | && !h->root.u.def.section->gc_mark |
| 8980 | && !(h->root.u.def.section->owner->flags & DYNAMIC)) |
| 8981 | { |
| 8982 | struct elf_gc_sweep_symbol_info *inf = data; |
| 8983 | (*inf->hide_symbol) (inf->info, h, TRUE); |
| 8984 | } |
| 8985 | |
| 8986 | return TRUE; |
| 8987 | } |
| 8988 | |
| 8989 | /* The sweep phase of garbage collection. Remove all garbage sections. */ |
| 8990 | |
| 8991 | typedef bfd_boolean (*gc_sweep_hook_fn) |
| 8992 | (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *); |
| 8993 | |
| 8994 | static bfd_boolean |
| 8995 | elf_gc_sweep (bfd *abfd, struct bfd_link_info *info) |
| 8996 | { |
| 8997 | bfd *sub; |
| 8998 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 8999 | gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook; |
| 9000 | unsigned long section_sym_count; |
| 9001 | struct elf_gc_sweep_symbol_info sweep_info; |
| 9002 | |
| 9003 | for (sub = info->input_bfds; sub != NULL; sub = sub->link_next) |
| 9004 | { |
| 9005 | asection *o; |
| 9006 | |
| 9007 | if (bfd_get_flavour (sub) != bfd_target_elf_flavour) |
| 9008 | continue; |
| 9009 | |
| 9010 | for (o = sub->sections; o != NULL; o = o->next) |
| 9011 | { |
| 9012 | /* Keep debug and special sections. */ |
| 9013 | if ((o->flags & (SEC_DEBUGGING | SEC_LINKER_CREATED)) != 0 |
| 9014 | || (o->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0) |
| 9015 | o->gc_mark = 1; |
| 9016 | |
| 9017 | if (o->gc_mark) |
| 9018 | continue; |
| 9019 | |
| 9020 | /* Skip sweeping sections already excluded. */ |
| 9021 | if (o->flags & SEC_EXCLUDE) |
| 9022 | continue; |
| 9023 | |
| 9024 | /* Since this is early in the link process, it is simple |
| 9025 | to remove a section from the output. */ |
| 9026 | o->flags |= SEC_EXCLUDE; |
| 9027 | |
| 9028 | /* But we also have to update some of the relocation |
| 9029 | info we collected before. */ |
| 9030 | if (gc_sweep_hook |
| 9031 | && (o->flags & SEC_RELOC) != 0 |
| 9032 | && o->reloc_count > 0 |
| 9033 | && !bfd_is_abs_section (o->output_section)) |
| 9034 | { |
| 9035 | Elf_Internal_Rela *internal_relocs; |
| 9036 | bfd_boolean r; |
| 9037 | |
| 9038 | internal_relocs |
| 9039 | = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL, |
| 9040 | info->keep_memory); |
| 9041 | if (internal_relocs == NULL) |
| 9042 | return FALSE; |
| 9043 | |
| 9044 | r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs); |
| 9045 | |
| 9046 | if (elf_section_data (o)->relocs != internal_relocs) |
| 9047 | free (internal_relocs); |
| 9048 | |
| 9049 | if (!r) |
| 9050 | return FALSE; |
| 9051 | } |
| 9052 | } |
| 9053 | } |
| 9054 | |
| 9055 | /* Remove the symbols that were in the swept sections from the dynamic |
| 9056 | symbol table. GCFIXME: Anyone know how to get them out of the |
| 9057 | static symbol table as well? */ |
| 9058 | sweep_info.info = info; |
| 9059 | sweep_info.hide_symbol = bed->elf_backend_hide_symbol; |
| 9060 | elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol, |
| 9061 | &sweep_info); |
| 9062 | |
| 9063 | _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count); |
| 9064 | return TRUE; |
| 9065 | } |
| 9066 | |
| 9067 | /* Propagate collected vtable information. This is called through |
| 9068 | elf_link_hash_traverse. */ |
| 9069 | |
| 9070 | static bfd_boolean |
| 9071 | elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp) |
| 9072 | { |
| 9073 | if (h->root.type == bfd_link_hash_warning) |
| 9074 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 9075 | |
| 9076 | /* Those that are not vtables. */ |
| 9077 | if (h->vtable == NULL || h->vtable->parent == NULL) |
| 9078 | return TRUE; |
| 9079 | |
| 9080 | /* Those vtables that do not have parents, we cannot merge. */ |
| 9081 | if (h->vtable->parent == (struct elf_link_hash_entry *) -1) |
| 9082 | return TRUE; |
| 9083 | |
| 9084 | /* If we've already been done, exit. */ |
| 9085 | if (h->vtable->used && h->vtable->used[-1]) |
| 9086 | return TRUE; |
| 9087 | |
| 9088 | /* Make sure the parent's table is up to date. */ |
| 9089 | elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp); |
| 9090 | |
| 9091 | if (h->vtable->used == NULL) |
| 9092 | { |
| 9093 | /* None of this table's entries were referenced. Re-use the |
| 9094 | parent's table. */ |
| 9095 | h->vtable->used = h->vtable->parent->vtable->used; |
| 9096 | h->vtable->size = h->vtable->parent->vtable->size; |
| 9097 | } |
| 9098 | else |
| 9099 | { |
| 9100 | size_t n; |
| 9101 | bfd_boolean *cu, *pu; |
| 9102 | |
| 9103 | /* Or the parent's entries into ours. */ |
| 9104 | cu = h->vtable->used; |
| 9105 | cu[-1] = TRUE; |
| 9106 | pu = h->vtable->parent->vtable->used; |
| 9107 | if (pu != NULL) |
| 9108 | { |
| 9109 | const struct elf_backend_data *bed; |
| 9110 | unsigned int log_file_align; |
| 9111 | |
| 9112 | bed = get_elf_backend_data (h->root.u.def.section->owner); |
| 9113 | log_file_align = bed->s->log_file_align; |
| 9114 | n = h->vtable->parent->vtable->size >> log_file_align; |
| 9115 | while (n--) |
| 9116 | { |
| 9117 | if (*pu) |
| 9118 | *cu = TRUE; |
| 9119 | pu++; |
| 9120 | cu++; |
| 9121 | } |
| 9122 | } |
| 9123 | } |
| 9124 | |
| 9125 | return TRUE; |
| 9126 | } |
| 9127 | |
| 9128 | static bfd_boolean |
| 9129 | elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp) |
| 9130 | { |
| 9131 | asection *sec; |
| 9132 | bfd_vma hstart, hend; |
| 9133 | Elf_Internal_Rela *relstart, *relend, *rel; |
| 9134 | const struct elf_backend_data *bed; |
| 9135 | unsigned int log_file_align; |
| 9136 | |
| 9137 | if (h->root.type == bfd_link_hash_warning) |
| 9138 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 9139 | |
| 9140 | /* Take care of both those symbols that do not describe vtables as |
| 9141 | well as those that are not loaded. */ |
| 9142 | if (h->vtable == NULL || h->vtable->parent == NULL) |
| 9143 | return TRUE; |
| 9144 | |
| 9145 | BFD_ASSERT (h->root.type == bfd_link_hash_defined |
| 9146 | || h->root.type == bfd_link_hash_defweak); |
| 9147 | |
| 9148 | sec = h->root.u.def.section; |
| 9149 | hstart = h->root.u.def.value; |
| 9150 | hend = hstart + h->size; |
| 9151 | |
| 9152 | relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE); |
| 9153 | if (!relstart) |
| 9154 | return *(bfd_boolean *) okp = FALSE; |
| 9155 | bed = get_elf_backend_data (sec->owner); |
| 9156 | log_file_align = bed->s->log_file_align; |
| 9157 | |
| 9158 | relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel; |
| 9159 | |
| 9160 | for (rel = relstart; rel < relend; ++rel) |
| 9161 | if (rel->r_offset >= hstart && rel->r_offset < hend) |
| 9162 | { |
| 9163 | /* If the entry is in use, do nothing. */ |
| 9164 | if (h->vtable->used |
| 9165 | && (rel->r_offset - hstart) < h->vtable->size) |
| 9166 | { |
| 9167 | bfd_vma entry = (rel->r_offset - hstart) >> log_file_align; |
| 9168 | if (h->vtable->used[entry]) |
| 9169 | continue; |
| 9170 | } |
| 9171 | /* Otherwise, kill it. */ |
| 9172 | rel->r_offset = rel->r_info = rel->r_addend = 0; |
| 9173 | } |
| 9174 | |
| 9175 | return TRUE; |
| 9176 | } |
| 9177 | |
| 9178 | /* Mark sections containing dynamically referenced symbols. When |
| 9179 | building shared libraries, we must assume that any visible symbol is |
| 9180 | referenced. */ |
| 9181 | |
| 9182 | bfd_boolean |
| 9183 | bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf) |
| 9184 | { |
| 9185 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 9186 | |
| 9187 | if (h->root.type == bfd_link_hash_warning) |
| 9188 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 9189 | |
| 9190 | if ((h->root.type == bfd_link_hash_defined |
| 9191 | || h->root.type == bfd_link_hash_defweak) |
| 9192 | && (h->ref_dynamic |
| 9193 | || (!info->executable |
| 9194 | && h->def_regular |
| 9195 | && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL |
| 9196 | && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN))) |
| 9197 | h->root.u.def.section->flags |= SEC_KEEP; |
| 9198 | |
| 9199 | return TRUE; |
| 9200 | } |
| 9201 | |
| 9202 | /* Do mark and sweep of unused sections. */ |
| 9203 | |
| 9204 | bfd_boolean |
| 9205 | bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info) |
| 9206 | { |
| 9207 | bfd_boolean ok = TRUE; |
| 9208 | bfd *sub; |
| 9209 | asection * (*gc_mark_hook) |
| 9210 | (asection *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 9211 | struct elf_link_hash_entry *h, Elf_Internal_Sym *); |
| 9212 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 9213 | |
| 9214 | if (!bed->can_gc_sections |
| 9215 | || info->relocatable |
| 9216 | || info->emitrelocations |
| 9217 | || !is_elf_hash_table (info->hash)) |
| 9218 | { |
| 9219 | (*_bfd_error_handler)(_("Warning: gc-sections option ignored")); |
| 9220 | return TRUE; |
| 9221 | } |
| 9222 | |
| 9223 | /* Apply transitive closure to the vtable entry usage info. */ |
| 9224 | elf_link_hash_traverse (elf_hash_table (info), |
| 9225 | elf_gc_propagate_vtable_entries_used, |
| 9226 | &ok); |
| 9227 | if (!ok) |
| 9228 | return FALSE; |
| 9229 | |
| 9230 | /* Kill the vtable relocations that were not used. */ |
| 9231 | elf_link_hash_traverse (elf_hash_table (info), |
| 9232 | elf_gc_smash_unused_vtentry_relocs, |
| 9233 | &ok); |
| 9234 | if (!ok) |
| 9235 | return FALSE; |
| 9236 | |
| 9237 | /* Mark dynamically referenced symbols. */ |
| 9238 | if (elf_hash_table (info)->dynamic_sections_created) |
| 9239 | elf_link_hash_traverse (elf_hash_table (info), |
| 9240 | bed->gc_mark_dynamic_ref, |
| 9241 | info); |
| 9242 | |
| 9243 | /* Grovel through relocs to find out who stays ... */ |
| 9244 | gc_mark_hook = bed->gc_mark_hook; |
| 9245 | for (sub = info->input_bfds; sub != NULL; sub = sub->link_next) |
| 9246 | { |
| 9247 | asection *o; |
| 9248 | |
| 9249 | if (bfd_get_flavour (sub) != bfd_target_elf_flavour) |
| 9250 | continue; |
| 9251 | |
| 9252 | for (o = sub->sections; o != NULL; o = o->next) |
| 9253 | if ((o->flags & SEC_KEEP) != 0 && !o->gc_mark) |
| 9254 | if (!_bfd_elf_gc_mark (info, o, gc_mark_hook)) |
| 9255 | return FALSE; |
| 9256 | } |
| 9257 | |
| 9258 | /* ... again for sections marked from eh_frame. */ |
| 9259 | for (sub = info->input_bfds; sub != NULL; sub = sub->link_next) |
| 9260 | { |
| 9261 | asection *o; |
| 9262 | |
| 9263 | if (bfd_get_flavour (sub) != bfd_target_elf_flavour) |
| 9264 | continue; |
| 9265 | |
| 9266 | /* Keep .gcc_except_table.* if the associated .text.* is |
| 9267 | marked. This isn't very nice, but the proper solution, |
| 9268 | splitting .eh_frame up and using comdat doesn't pan out |
| 9269 | easily due to needing special relocs to handle the |
| 9270 | difference of two symbols in separate sections. |
| 9271 | Don't keep code sections referenced by .eh_frame. */ |
| 9272 | for (o = sub->sections; o != NULL; o = o->next) |
| 9273 | if (!o->gc_mark && o->gc_mark_from_eh && (o->flags & SEC_CODE) == 0) |
| 9274 | { |
| 9275 | if (strncmp (o->name, ".gcc_except_table.", 18) == 0) |
| 9276 | { |
| 9277 | unsigned long len; |
| 9278 | char *fn_name; |
| 9279 | asection *fn_text; |
| 9280 | |
| 9281 | len = strlen (o->name + 18) + 1; |
| 9282 | fn_name = bfd_malloc (len + 6); |
| 9283 | if (fn_name == NULL) |
| 9284 | return FALSE; |
| 9285 | memcpy (fn_name, ".text.", 6); |
| 9286 | memcpy (fn_name + 6, o->name + 18, len); |
| 9287 | fn_text = bfd_get_section_by_name (sub, fn_name); |
| 9288 | free (fn_name); |
| 9289 | if (fn_text == NULL || !fn_text->gc_mark) |
| 9290 | continue; |
| 9291 | } |
| 9292 | |
| 9293 | /* If not using specially named exception table section, |
| 9294 | then keep whatever we are using. */ |
| 9295 | if (!_bfd_elf_gc_mark (info, o, gc_mark_hook)) |
| 9296 | return FALSE; |
| 9297 | } |
| 9298 | } |
| 9299 | |
| 9300 | /* ... and mark SEC_EXCLUDE for those that go. */ |
| 9301 | return elf_gc_sweep (abfd, info); |
| 9302 | } |
| 9303 | \f |
| 9304 | /* Called from check_relocs to record the existence of a VTINHERIT reloc. */ |
| 9305 | |
| 9306 | bfd_boolean |
| 9307 | bfd_elf_gc_record_vtinherit (bfd *abfd, |
| 9308 | asection *sec, |
| 9309 | struct elf_link_hash_entry *h, |
| 9310 | bfd_vma offset) |
| 9311 | { |
| 9312 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; |
| 9313 | struct elf_link_hash_entry **search, *child; |
| 9314 | bfd_size_type extsymcount; |
| 9315 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 9316 | |
| 9317 | /* The sh_info field of the symtab header tells us where the |
| 9318 | external symbols start. We don't care about the local symbols at |
| 9319 | this point. */ |
| 9320 | extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym; |
| 9321 | if (!elf_bad_symtab (abfd)) |
| 9322 | extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info; |
| 9323 | |
| 9324 | sym_hashes = elf_sym_hashes (abfd); |
| 9325 | sym_hashes_end = sym_hashes + extsymcount; |
| 9326 | |
| 9327 | /* Hunt down the child symbol, which is in this section at the same |
| 9328 | offset as the relocation. */ |
| 9329 | for (search = sym_hashes; search != sym_hashes_end; ++search) |
| 9330 | { |
| 9331 | if ((child = *search) != NULL |
| 9332 | && (child->root.type == bfd_link_hash_defined |
| 9333 | || child->root.type == bfd_link_hash_defweak) |
| 9334 | && child->root.u.def.section == sec |
| 9335 | && child->root.u.def.value == offset) |
| 9336 | goto win; |
| 9337 | } |
| 9338 | |
| 9339 | (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT", |
| 9340 | abfd, sec, (unsigned long) offset); |
| 9341 | bfd_set_error (bfd_error_invalid_operation); |
| 9342 | return FALSE; |
| 9343 | |
| 9344 | win: |
| 9345 | if (!child->vtable) |
| 9346 | { |
| 9347 | child->vtable = bfd_zalloc (abfd, sizeof (*child->vtable)); |
| 9348 | if (!child->vtable) |
| 9349 | return FALSE; |
| 9350 | } |
| 9351 | if (!h) |
| 9352 | { |
| 9353 | /* This *should* only be the absolute section. It could potentially |
| 9354 | be that someone has defined a non-global vtable though, which |
| 9355 | would be bad. It isn't worth paging in the local symbols to be |
| 9356 | sure though; that case should simply be handled by the assembler. */ |
| 9357 | |
| 9358 | child->vtable->parent = (struct elf_link_hash_entry *) -1; |
| 9359 | } |
| 9360 | else |
| 9361 | child->vtable->parent = h; |
| 9362 | |
| 9363 | return TRUE; |
| 9364 | } |
| 9365 | |
| 9366 | /* Called from check_relocs to record the existence of a VTENTRY reloc. */ |
| 9367 | |
| 9368 | bfd_boolean |
| 9369 | bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED, |
| 9370 | asection *sec ATTRIBUTE_UNUSED, |
| 9371 | struct elf_link_hash_entry *h, |
| 9372 | bfd_vma addend) |
| 9373 | { |
| 9374 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 9375 | unsigned int log_file_align = bed->s->log_file_align; |
| 9376 | |
| 9377 | if (!h->vtable) |
| 9378 | { |
| 9379 | h->vtable = bfd_zalloc (abfd, sizeof (*h->vtable)); |
| 9380 | if (!h->vtable) |
| 9381 | return FALSE; |
| 9382 | } |
| 9383 | |
| 9384 | if (addend >= h->vtable->size) |
| 9385 | { |
| 9386 | size_t size, bytes, file_align; |
| 9387 | bfd_boolean *ptr = h->vtable->used; |
| 9388 | |
| 9389 | /* While the symbol is undefined, we have to be prepared to handle |
| 9390 | a zero size. */ |
| 9391 | file_align = 1 << log_file_align; |
| 9392 | if (h->root.type == bfd_link_hash_undefined) |
| 9393 | size = addend + file_align; |
| 9394 | else |
| 9395 | { |
| 9396 | size = h->size; |
| 9397 | if (addend >= size) |
| 9398 | { |
| 9399 | /* Oops! We've got a reference past the defined end of |
| 9400 | the table. This is probably a bug -- shall we warn? */ |
| 9401 | size = addend + file_align; |
| 9402 | } |
| 9403 | } |
| 9404 | size = (size + file_align - 1) & -file_align; |
| 9405 | |
| 9406 | /* Allocate one extra entry for use as a "done" flag for the |
| 9407 | consolidation pass. */ |
| 9408 | bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean); |
| 9409 | |
| 9410 | if (ptr) |
| 9411 | { |
| 9412 | ptr = bfd_realloc (ptr - 1, bytes); |
| 9413 | |
| 9414 | if (ptr != NULL) |
| 9415 | { |
| 9416 | size_t oldbytes; |
| 9417 | |
| 9418 | oldbytes = (((h->vtable->size >> log_file_align) + 1) |
| 9419 | * sizeof (bfd_boolean)); |
| 9420 | memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes); |
| 9421 | } |
| 9422 | } |
| 9423 | else |
| 9424 | ptr = bfd_zmalloc (bytes); |
| 9425 | |
| 9426 | if (ptr == NULL) |
| 9427 | return FALSE; |
| 9428 | |
| 9429 | /* And arrange for that done flag to be at index -1. */ |
| 9430 | h->vtable->used = ptr + 1; |
| 9431 | h->vtable->size = size; |
| 9432 | } |
| 9433 | |
| 9434 | h->vtable->used[addend >> log_file_align] = TRUE; |
| 9435 | |
| 9436 | return TRUE; |
| 9437 | } |
| 9438 | |
| 9439 | struct alloc_got_off_arg { |
| 9440 | bfd_vma gotoff; |
| 9441 | unsigned int got_elt_size; |
| 9442 | }; |
| 9443 | |
| 9444 | /* We need a special top-level link routine to convert got reference counts |
| 9445 | to real got offsets. */ |
| 9446 | |
| 9447 | static bfd_boolean |
| 9448 | elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg) |
| 9449 | { |
| 9450 | struct alloc_got_off_arg *gofarg = arg; |
| 9451 | |
| 9452 | if (h->root.type == bfd_link_hash_warning) |
| 9453 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 9454 | |
| 9455 | if (h->got.refcount > 0) |
| 9456 | { |
| 9457 | h->got.offset = gofarg->gotoff; |
| 9458 | gofarg->gotoff += gofarg->got_elt_size; |
| 9459 | } |
| 9460 | else |
| 9461 | h->got.offset = (bfd_vma) -1; |
| 9462 | |
| 9463 | return TRUE; |
| 9464 | } |
| 9465 | |
| 9466 | /* And an accompanying bit to work out final got entry offsets once |
| 9467 | we're done. Should be called from final_link. */ |
| 9468 | |
| 9469 | bfd_boolean |
| 9470 | bfd_elf_gc_common_finalize_got_offsets (bfd *abfd, |
| 9471 | struct bfd_link_info *info) |
| 9472 | { |
| 9473 | bfd *i; |
| 9474 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 9475 | bfd_vma gotoff; |
| 9476 | unsigned int got_elt_size = bed->s->arch_size / 8; |
| 9477 | struct alloc_got_off_arg gofarg; |
| 9478 | |
| 9479 | if (! is_elf_hash_table (info->hash)) |
| 9480 | return FALSE; |
| 9481 | |
| 9482 | /* The GOT offset is relative to the .got section, but the GOT header is |
| 9483 | put into the .got.plt section, if the backend uses it. */ |
| 9484 | if (bed->want_got_plt) |
| 9485 | gotoff = 0; |
| 9486 | else |
| 9487 | gotoff = bed->got_header_size; |
| 9488 | |
| 9489 | /* Do the local .got entries first. */ |
| 9490 | for (i = info->input_bfds; i; i = i->link_next) |
| 9491 | { |
| 9492 | bfd_signed_vma *local_got; |
| 9493 | bfd_size_type j, locsymcount; |
| 9494 | Elf_Internal_Shdr *symtab_hdr; |
| 9495 | |
| 9496 | if (bfd_get_flavour (i) != bfd_target_elf_flavour) |
| 9497 | continue; |
| 9498 | |
| 9499 | local_got = elf_local_got_refcounts (i); |
| 9500 | if (!local_got) |
| 9501 | continue; |
| 9502 | |
| 9503 | symtab_hdr = &elf_tdata (i)->symtab_hdr; |
| 9504 | if (elf_bad_symtab (i)) |
| 9505 | locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym; |
| 9506 | else |
| 9507 | locsymcount = symtab_hdr->sh_info; |
| 9508 | |
| 9509 | for (j = 0; j < locsymcount; ++j) |
| 9510 | { |
| 9511 | if (local_got[j] > 0) |
| 9512 | { |
| 9513 | local_got[j] = gotoff; |
| 9514 | gotoff += got_elt_size; |
| 9515 | } |
| 9516 | else |
| 9517 | local_got[j] = (bfd_vma) -1; |
| 9518 | } |
| 9519 | } |
| 9520 | |
| 9521 | /* Then the global .got entries. .plt refcounts are handled by |
| 9522 | adjust_dynamic_symbol */ |
| 9523 | gofarg.gotoff = gotoff; |
| 9524 | gofarg.got_elt_size = got_elt_size; |
| 9525 | elf_link_hash_traverse (elf_hash_table (info), |
| 9526 | elf_gc_allocate_got_offsets, |
| 9527 | &gofarg); |
| 9528 | return TRUE; |
| 9529 | } |
| 9530 | |
| 9531 | /* Many folk need no more in the way of final link than this, once |
| 9532 | got entry reference counting is enabled. */ |
| 9533 | |
| 9534 | bfd_boolean |
| 9535 | bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info) |
| 9536 | { |
| 9537 | if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info)) |
| 9538 | return FALSE; |
| 9539 | |
| 9540 | /* Invoke the regular ELF backend linker to do all the work. */ |
| 9541 | return bfd_elf_final_link (abfd, info); |
| 9542 | } |
| 9543 | |
| 9544 | bfd_boolean |
| 9545 | bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie) |
| 9546 | { |
| 9547 | struct elf_reloc_cookie *rcookie = cookie; |
| 9548 | |
| 9549 | if (rcookie->bad_symtab) |
| 9550 | rcookie->rel = rcookie->rels; |
| 9551 | |
| 9552 | for (; rcookie->rel < rcookie->relend; rcookie->rel++) |
| 9553 | { |
| 9554 | unsigned long r_symndx; |
| 9555 | |
| 9556 | if (! rcookie->bad_symtab) |
| 9557 | if (rcookie->rel->r_offset > offset) |
| 9558 | return FALSE; |
| 9559 | if (rcookie->rel->r_offset != offset) |
| 9560 | continue; |
| 9561 | |
| 9562 | r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift; |
| 9563 | if (r_symndx == SHN_UNDEF) |
| 9564 | return TRUE; |
| 9565 | |
| 9566 | if (r_symndx >= rcookie->locsymcount |
| 9567 | || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL) |
| 9568 | { |
| 9569 | struct elf_link_hash_entry *h; |
| 9570 | |
| 9571 | h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff]; |
| 9572 | |
| 9573 | while (h->root.type == bfd_link_hash_indirect |
| 9574 | || h->root.type == bfd_link_hash_warning) |
| 9575 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 9576 | |
| 9577 | if ((h->root.type == bfd_link_hash_defined |
| 9578 | || h->root.type == bfd_link_hash_defweak) |
| 9579 | && elf_discarded_section (h->root.u.def.section)) |
| 9580 | return TRUE; |
| 9581 | else |
| 9582 | return FALSE; |
| 9583 | } |
| 9584 | else |
| 9585 | { |
| 9586 | /* It's not a relocation against a global symbol, |
| 9587 | but it could be a relocation against a local |
| 9588 | symbol for a discarded section. */ |
| 9589 | asection *isec; |
| 9590 | Elf_Internal_Sym *isym; |
| 9591 | |
| 9592 | /* Need to: get the symbol; get the section. */ |
| 9593 | isym = &rcookie->locsyms[r_symndx]; |
| 9594 | if (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE) |
| 9595 | { |
| 9596 | isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx); |
| 9597 | if (isec != NULL && elf_discarded_section (isec)) |
| 9598 | return TRUE; |
| 9599 | } |
| 9600 | } |
| 9601 | return FALSE; |
| 9602 | } |
| 9603 | return FALSE; |
| 9604 | } |
| 9605 | |
| 9606 | /* Discard unneeded references to discarded sections. |
| 9607 | Returns TRUE if any section's size was changed. */ |
| 9608 | /* This function assumes that the relocations are in sorted order, |
| 9609 | which is true for all known assemblers. */ |
| 9610 | |
| 9611 | bfd_boolean |
| 9612 | bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info) |
| 9613 | { |
| 9614 | struct elf_reloc_cookie cookie; |
| 9615 | asection *stab, *eh; |
| 9616 | Elf_Internal_Shdr *symtab_hdr; |
| 9617 | const struct elf_backend_data *bed; |
| 9618 | bfd *abfd; |
| 9619 | unsigned int count; |
| 9620 | bfd_boolean ret = FALSE; |
| 9621 | |
| 9622 | if (info->traditional_format |
| 9623 | || !is_elf_hash_table (info->hash)) |
| 9624 | return FALSE; |
| 9625 | |
| 9626 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next) |
| 9627 | { |
| 9628 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) |
| 9629 | continue; |
| 9630 | |
| 9631 | bed = get_elf_backend_data (abfd); |
| 9632 | |
| 9633 | if ((abfd->flags & DYNAMIC) != 0) |
| 9634 | continue; |
| 9635 | |
| 9636 | eh = bfd_get_section_by_name (abfd, ".eh_frame"); |
| 9637 | if (info->relocatable |
| 9638 | || (eh != NULL |
| 9639 | && (eh->size == 0 |
| 9640 | || bfd_is_abs_section (eh->output_section)))) |
| 9641 | eh = NULL; |
| 9642 | |
| 9643 | stab = bfd_get_section_by_name (abfd, ".stab"); |
| 9644 | if (stab != NULL |
| 9645 | && (stab->size == 0 |
| 9646 | || bfd_is_abs_section (stab->output_section) |
| 9647 | || stab->sec_info_type != ELF_INFO_TYPE_STABS)) |
| 9648 | stab = NULL; |
| 9649 | |
| 9650 | if (stab == NULL |
| 9651 | && eh == NULL |
| 9652 | && bed->elf_backend_discard_info == NULL) |
| 9653 | continue; |
| 9654 | |
| 9655 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 9656 | cookie.abfd = abfd; |
| 9657 | cookie.sym_hashes = elf_sym_hashes (abfd); |
| 9658 | cookie.bad_symtab = elf_bad_symtab (abfd); |
| 9659 | if (cookie.bad_symtab) |
| 9660 | { |
| 9661 | cookie.locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym; |
| 9662 | cookie.extsymoff = 0; |
| 9663 | } |
| 9664 | else |
| 9665 | { |
| 9666 | cookie.locsymcount = symtab_hdr->sh_info; |
| 9667 | cookie.extsymoff = symtab_hdr->sh_info; |
| 9668 | } |
| 9669 | |
| 9670 | if (bed->s->arch_size == 32) |
| 9671 | cookie.r_sym_shift = 8; |
| 9672 | else |
| 9673 | cookie.r_sym_shift = 32; |
| 9674 | |
| 9675 | cookie.locsyms = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 9676 | if (cookie.locsyms == NULL && cookie.locsymcount != 0) |
| 9677 | { |
| 9678 | cookie.locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 9679 | cookie.locsymcount, 0, |
| 9680 | NULL, NULL, NULL); |
| 9681 | if (cookie.locsyms == NULL) |
| 9682 | return FALSE; |
| 9683 | } |
| 9684 | |
| 9685 | if (stab != NULL) |
| 9686 | { |
| 9687 | cookie.rels = NULL; |
| 9688 | count = stab->reloc_count; |
| 9689 | if (count != 0) |
| 9690 | cookie.rels = _bfd_elf_link_read_relocs (abfd, stab, NULL, NULL, |
| 9691 | info->keep_memory); |
| 9692 | if (cookie.rels != NULL) |
| 9693 | { |
| 9694 | cookie.rel = cookie.rels; |
| 9695 | cookie.relend = cookie.rels; |
| 9696 | cookie.relend += count * bed->s->int_rels_per_ext_rel; |
| 9697 | if (_bfd_discard_section_stabs (abfd, stab, |
| 9698 | elf_section_data (stab)->sec_info, |
| 9699 | bfd_elf_reloc_symbol_deleted_p, |
| 9700 | &cookie)) |
| 9701 | ret = TRUE; |
| 9702 | if (elf_section_data (stab)->relocs != cookie.rels) |
| 9703 | free (cookie.rels); |
| 9704 | } |
| 9705 | } |
| 9706 | |
| 9707 | if (eh != NULL) |
| 9708 | { |
| 9709 | cookie.rels = NULL; |
| 9710 | count = eh->reloc_count; |
| 9711 | if (count != 0) |
| 9712 | cookie.rels = _bfd_elf_link_read_relocs (abfd, eh, NULL, NULL, |
| 9713 | info->keep_memory); |
| 9714 | cookie.rel = cookie.rels; |
| 9715 | cookie.relend = cookie.rels; |
| 9716 | if (cookie.rels != NULL) |
| 9717 | cookie.relend += count * bed->s->int_rels_per_ext_rel; |
| 9718 | |
| 9719 | if (_bfd_elf_discard_section_eh_frame (abfd, info, eh, |
| 9720 | bfd_elf_reloc_symbol_deleted_p, |
| 9721 | &cookie)) |
| 9722 | ret = TRUE; |
| 9723 | |
| 9724 | if (cookie.rels != NULL |
| 9725 | && elf_section_data (eh)->relocs != cookie.rels) |
| 9726 | free (cookie.rels); |
| 9727 | } |
| 9728 | |
| 9729 | if (bed->elf_backend_discard_info != NULL |
| 9730 | && (*bed->elf_backend_discard_info) (abfd, &cookie, info)) |
| 9731 | ret = TRUE; |
| 9732 | |
| 9733 | if (cookie.locsyms != NULL |
| 9734 | && symtab_hdr->contents != (unsigned char *) cookie.locsyms) |
| 9735 | { |
| 9736 | if (! info->keep_memory) |
| 9737 | free (cookie.locsyms); |
| 9738 | else |
| 9739 | symtab_hdr->contents = (unsigned char *) cookie.locsyms; |
| 9740 | } |
| 9741 | } |
| 9742 | |
| 9743 | if (info->eh_frame_hdr |
| 9744 | && !info->relocatable |
| 9745 | && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info)) |
| 9746 | ret = TRUE; |
| 9747 | |
| 9748 | return ret; |
| 9749 | } |
| 9750 | |
| 9751 | void |
| 9752 | _bfd_elf_section_already_linked (bfd *abfd, struct bfd_section * sec) |
| 9753 | { |
| 9754 | flagword flags; |
| 9755 | const char *name, *p; |
| 9756 | struct bfd_section_already_linked *l; |
| 9757 | struct bfd_section_already_linked_hash_entry *already_linked_list; |
| 9758 | asection *group; |
| 9759 | |
| 9760 | /* A single member comdat group section may be discarded by a |
| 9761 | linkonce section. See below. */ |
| 9762 | if (sec->output_section == bfd_abs_section_ptr) |
| 9763 | return; |
| 9764 | |
| 9765 | flags = sec->flags; |
| 9766 | |
| 9767 | /* Check if it belongs to a section group. */ |
| 9768 | group = elf_sec_group (sec); |
| 9769 | |
| 9770 | /* Return if it isn't a linkonce section nor a member of a group. A |
| 9771 | comdat group section also has SEC_LINK_ONCE set. */ |
| 9772 | if ((flags & SEC_LINK_ONCE) == 0 && group == NULL) |
| 9773 | return; |
| 9774 | |
| 9775 | if (group) |
| 9776 | { |
| 9777 | /* If this is the member of a single member comdat group, check if |
| 9778 | the group should be discarded. */ |
| 9779 | if (elf_next_in_group (sec) == sec |
| 9780 | && (group->flags & SEC_LINK_ONCE) != 0) |
| 9781 | sec = group; |
| 9782 | else |
| 9783 | return; |
| 9784 | } |
| 9785 | |
| 9786 | /* FIXME: When doing a relocatable link, we may have trouble |
| 9787 | copying relocations in other sections that refer to local symbols |
| 9788 | in the section being discarded. Those relocations will have to |
| 9789 | be converted somehow; as of this writing I'm not sure that any of |
| 9790 | the backends handle that correctly. |
| 9791 | |
| 9792 | It is tempting to instead not discard link once sections when |
| 9793 | doing a relocatable link (technically, they should be discarded |
| 9794 | whenever we are building constructors). However, that fails, |
| 9795 | because the linker winds up combining all the link once sections |
| 9796 | into a single large link once section, which defeats the purpose |
| 9797 | of having link once sections in the first place. |
| 9798 | |
| 9799 | Also, not merging link once sections in a relocatable link |
| 9800 | causes trouble for MIPS ELF, which relies on link once semantics |
| 9801 | to handle the .reginfo section correctly. */ |
| 9802 | |
| 9803 | name = bfd_get_section_name (abfd, sec); |
| 9804 | |
| 9805 | if (strncmp (name, ".gnu.linkonce.", sizeof (".gnu.linkonce.") - 1) == 0 |
| 9806 | && (p = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL) |
| 9807 | p++; |
| 9808 | else |
| 9809 | p = name; |
| 9810 | |
| 9811 | already_linked_list = bfd_section_already_linked_table_lookup (p); |
| 9812 | |
| 9813 | for (l = already_linked_list->entry; l != NULL; l = l->next) |
| 9814 | { |
| 9815 | /* We may have 3 different sections on the list: group section, |
| 9816 | comdat section and linkonce section. SEC may be a linkonce or |
| 9817 | group section. We match a group section with a group section, |
| 9818 | a linkonce section with a linkonce section, and ignore comdat |
| 9819 | section. */ |
| 9820 | if ((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP) |
| 9821 | && strcmp (name, l->sec->name) == 0 |
| 9822 | && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL) |
| 9823 | { |
| 9824 | /* The section has already been linked. See if we should |
| 9825 | issue a warning. */ |
| 9826 | switch (flags & SEC_LINK_DUPLICATES) |
| 9827 | { |
| 9828 | default: |
| 9829 | abort (); |
| 9830 | |
| 9831 | case SEC_LINK_DUPLICATES_DISCARD: |
| 9832 | break; |
| 9833 | |
| 9834 | case SEC_LINK_DUPLICATES_ONE_ONLY: |
| 9835 | (*_bfd_error_handler) |
| 9836 | (_("%B: ignoring duplicate section `%A'"), |
| 9837 | abfd, sec); |
| 9838 | break; |
| 9839 | |
| 9840 | case SEC_LINK_DUPLICATES_SAME_SIZE: |
| 9841 | if (sec->size != l->sec->size) |
| 9842 | (*_bfd_error_handler) |
| 9843 | (_("%B: duplicate section `%A' has different size"), |
| 9844 | abfd, sec); |
| 9845 | break; |
| 9846 | |
| 9847 | case SEC_LINK_DUPLICATES_SAME_CONTENTS: |
| 9848 | if (sec->size != l->sec->size) |
| 9849 | (*_bfd_error_handler) |
| 9850 | (_("%B: duplicate section `%A' has different size"), |
| 9851 | abfd, sec); |
| 9852 | else if (sec->size != 0) |
| 9853 | { |
| 9854 | bfd_byte *sec_contents, *l_sec_contents; |
| 9855 | |
| 9856 | if (!bfd_malloc_and_get_section (abfd, sec, &sec_contents)) |
| 9857 | (*_bfd_error_handler) |
| 9858 | (_("%B: warning: could not read contents of section `%A'"), |
| 9859 | abfd, sec); |
| 9860 | else if (!bfd_malloc_and_get_section (l->sec->owner, l->sec, |
| 9861 | &l_sec_contents)) |
| 9862 | (*_bfd_error_handler) |
| 9863 | (_("%B: warning: could not read contents of section `%A'"), |
| 9864 | l->sec->owner, l->sec); |
| 9865 | else if (memcmp (sec_contents, l_sec_contents, sec->size) != 0) |
| 9866 | (*_bfd_error_handler) |
| 9867 | (_("%B: warning: duplicate section `%A' has different contents"), |
| 9868 | abfd, sec); |
| 9869 | |
| 9870 | if (sec_contents) |
| 9871 | free (sec_contents); |
| 9872 | if (l_sec_contents) |
| 9873 | free (l_sec_contents); |
| 9874 | } |
| 9875 | break; |
| 9876 | } |
| 9877 | |
| 9878 | /* Set the output_section field so that lang_add_section |
| 9879 | does not create a lang_input_section structure for this |
| 9880 | section. Since there might be a symbol in the section |
| 9881 | being discarded, we must retain a pointer to the section |
| 9882 | which we are really going to use. */ |
| 9883 | sec->output_section = bfd_abs_section_ptr; |
| 9884 | sec->kept_section = l->sec; |
| 9885 | |
| 9886 | if (flags & SEC_GROUP) |
| 9887 | { |
| 9888 | asection *first = elf_next_in_group (sec); |
| 9889 | asection *s = first; |
| 9890 | |
| 9891 | while (s != NULL) |
| 9892 | { |
| 9893 | s->output_section = bfd_abs_section_ptr; |
| 9894 | /* Record which group discards it. */ |
| 9895 | s->kept_section = l->sec; |
| 9896 | s = elf_next_in_group (s); |
| 9897 | /* These lists are circular. */ |
| 9898 | if (s == first) |
| 9899 | break; |
| 9900 | } |
| 9901 | } |
| 9902 | |
| 9903 | return; |
| 9904 | } |
| 9905 | } |
| 9906 | |
| 9907 | if (group) |
| 9908 | { |
| 9909 | /* If this is the member of a single member comdat group and the |
| 9910 | group hasn't be discarded, we check if it matches a linkonce |
| 9911 | section. We only record the discarded comdat group. Otherwise |
| 9912 | the undiscarded group will be discarded incorrectly later since |
| 9913 | itself has been recorded. */ |
| 9914 | for (l = already_linked_list->entry; l != NULL; l = l->next) |
| 9915 | if ((l->sec->flags & SEC_GROUP) == 0 |
| 9916 | && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL |
| 9917 | && bfd_elf_match_symbols_in_sections (l->sec, |
| 9918 | elf_next_in_group (sec))) |
| 9919 | { |
| 9920 | elf_next_in_group (sec)->output_section = bfd_abs_section_ptr; |
| 9921 | elf_next_in_group (sec)->kept_section = l->sec; |
| 9922 | group->output_section = bfd_abs_section_ptr; |
| 9923 | break; |
| 9924 | } |
| 9925 | if (l == NULL) |
| 9926 | return; |
| 9927 | } |
| 9928 | else |
| 9929 | /* There is no direct match. But for linkonce section, we should |
| 9930 | check if there is a match with comdat group member. We always |
| 9931 | record the linkonce section, discarded or not. */ |
| 9932 | for (l = already_linked_list->entry; l != NULL; l = l->next) |
| 9933 | if (l->sec->flags & SEC_GROUP) |
| 9934 | { |
| 9935 | asection *first = elf_next_in_group (l->sec); |
| 9936 | |
| 9937 | if (first != NULL |
| 9938 | && elf_next_in_group (first) == first |
| 9939 | && bfd_elf_match_symbols_in_sections (first, sec)) |
| 9940 | { |
| 9941 | sec->output_section = bfd_abs_section_ptr; |
| 9942 | sec->kept_section = l->sec; |
| 9943 | break; |
| 9944 | } |
| 9945 | } |
| 9946 | |
| 9947 | /* This is the first section with this name. Record it. */ |
| 9948 | bfd_section_already_linked_table_insert (already_linked_list, sec); |
| 9949 | } |
| 9950 | |
| 9951 | bfd_boolean |
| 9952 | _bfd_elf_common_definition (Elf_Internal_Sym *sym) |
| 9953 | { |
| 9954 | return sym->st_shndx == SHN_COMMON; |
| 9955 | } |
| 9956 | |
| 9957 | unsigned int |
| 9958 | _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED) |
| 9959 | { |
| 9960 | return SHN_COMMON; |
| 9961 | } |
| 9962 | |
| 9963 | asection * |
| 9964 | _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED) |
| 9965 | { |
| 9966 | return bfd_com_section_ptr; |
| 9967 | } |