elf-bfd.h revision 218822
1/* BFD back-end data structures for ELF files. 2 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 3 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. 4 Written by Cygnus Support. 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 21 22#ifndef _LIBELF_H_ 23#define _LIBELF_H_ 1 24 25#include "elf/common.h" 26#include "elf/internal.h" 27#include "elf/external.h" 28#include "bfdlink.h" 29 30/* The number of entries in a section is its size divided by the size 31 of a single entry. This is normally only applicable to reloc and 32 symbol table sections. */ 33#define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_size / (shdr)->sh_entsize) 34 35/* If size isn't specified as 64 or 32, NAME macro should fail. */ 36#ifndef NAME 37#if ARCH_SIZE == 64 38#define NAME(x, y) x ## 64 ## _ ## y 39#endif 40#if ARCH_SIZE == 32 41#define NAME(x, y) x ## 32 ## _ ## y 42#endif 43#endif 44 45#ifndef NAME 46#define NAME(x, y) x ## NOSIZE ## _ ## y 47#endif 48 49#define ElfNAME(X) NAME(Elf,X) 50#define elfNAME(X) NAME(elf,X) 51 52/* Information held for an ELF symbol. The first field is the 53 corresponding asymbol. Every symbol is an ELF file is actually a 54 pointer to this structure, although it is often handled as a 55 pointer to an asymbol. */ 56 57typedef struct 58{ 59 /* The BFD symbol. */ 60 asymbol symbol; 61 /* ELF symbol information. */ 62 Elf_Internal_Sym internal_elf_sym; 63 /* Backend specific information. */ 64 union 65 { 66 unsigned int hppa_arg_reloc; 67 void *mips_extr; 68 void *any; 69 } 70 tc_data; 71 72 /* Version information. This is from an Elf_Internal_Versym 73 structure in a SHT_GNU_versym section. It is zero if there is no 74 version information. */ 75 unsigned short version; 76 77} elf_symbol_type; 78 79struct elf_strtab_hash; 80struct got_entry; 81struct plt_entry; 82 83/* ELF linker hash table entries. */ 84 85struct elf_link_hash_entry 86{ 87 struct bfd_link_hash_entry root; 88 89 /* Symbol index in output file. This is initialized to -1. It is 90 set to -2 if the symbol is used by a reloc. */ 91 long indx; 92 93 /* Symbol index as a dynamic symbol. Initialized to -1, and remains 94 -1 if this is not a dynamic symbol. */ 95 /* ??? Note that this is consistently used as a synonym for tests 96 against whether we can perform various simplifying transformations 97 to the code. (E.g. changing a pc-relative jump to a PLT entry 98 into a pc-relative jump to the target function.) That test, which 99 is often relatively complex, and someplaces wrong or incomplete, 100 should really be replaced by a predicate in elflink.c. 101 102 End result: this field -1 does not indicate that the symbol is 103 not in the dynamic symbol table, but rather that the symbol is 104 not visible outside this DSO. */ 105 long dynindx; 106 107 /* If this symbol requires an entry in the global offset table, the 108 processor specific backend uses this field to track usage and 109 final offset. Two schemes are supported: The first assumes that 110 a symbol may only have one GOT entry, and uses REFCOUNT until 111 size_dynamic_sections, at which point the contents of the .got is 112 fixed. Afterward, if OFFSET is -1, then the symbol does not 113 require a global offset table entry. The second scheme allows 114 multiple GOT entries per symbol, managed via a linked list 115 pointed to by GLIST. */ 116 union gotplt_union 117 { 118 bfd_signed_vma refcount; 119 bfd_vma offset; 120 struct got_entry *glist; 121 struct plt_entry *plist; 122 } got; 123 124 /* Same, but tracks a procedure linkage table entry. */ 125 union gotplt_union plt; 126 127 /* Symbol size. */ 128 bfd_size_type size; 129 130 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */ 131 unsigned int type : 8; 132 133 /* Symbol st_other value, symbol visibility. */ 134 unsigned int other : 8; 135 136 /* Symbol is referenced by a non-shared object. */ 137 unsigned int ref_regular : 1; 138 /* Symbol is defined by a non-shared object. */ 139 unsigned int def_regular : 1; 140 /* Symbol is referenced by a shared object. */ 141 unsigned int ref_dynamic : 1; 142 /* Symbol is defined by a shared object. */ 143 unsigned int def_dynamic : 1; 144 /* Symbol has a non-weak reference from a non-shared object. */ 145 unsigned int ref_regular_nonweak : 1; 146 /* Dynamic symbol has been adjustd. */ 147 unsigned int dynamic_adjusted : 1; 148 /* Symbol needs a copy reloc. */ 149 unsigned int needs_copy : 1; 150 /* Symbol needs a procedure linkage table entry. */ 151 unsigned int needs_plt : 1; 152 /* Symbol appears in a non-ELF input file. */ 153 unsigned int non_elf : 1; 154 /* Symbol should be marked as hidden in the version information. */ 155 unsigned int hidden : 1; 156 /* Symbol was forced to local scope due to a version script file. */ 157 unsigned int forced_local : 1; 158 /* Symbol was forced to be dynamic due to a version script file. */ 159 unsigned int dynamic : 1; 160 /* Symbol was marked during garbage collection. */ 161 unsigned int mark : 1; 162 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is 163 not currently set by all the backends. */ 164 unsigned int non_got_ref : 1; 165 /* Symbol has a definition in a shared object. 166 FIXME: There is no real need for this field if def_dynamic is never 167 cleared and all places that test def_dynamic also test def_regular. */ 168 unsigned int dynamic_def : 1; 169 /* Symbol is weak in all shared objects. */ 170 unsigned int dynamic_weak : 1; 171 /* Symbol is referenced with a relocation where C/C++ pointer equality 172 matters. */ 173 unsigned int pointer_equality_needed : 1; 174 175 /* String table index in .dynstr if this is a dynamic symbol. */ 176 unsigned long dynstr_index; 177 178 union 179 { 180 /* If this is a weak defined symbol from a dynamic object, this 181 field points to a defined symbol with the same value, if there is 182 one. Otherwise it is NULL. */ 183 struct elf_link_hash_entry *weakdef; 184 185 /* Hash value of the name computed using the ELF hash function. 186 Used part way through size_dynamic_sections, after we've finished 187 with weakdefs. */ 188 unsigned long elf_hash_value; 189 } u; 190 191 /* Version information. */ 192 union 193 { 194 /* This field is used for a symbol which is not defined in a 195 regular object. It points to the version information read in 196 from the dynamic object. */ 197 Elf_Internal_Verdef *verdef; 198 /* This field is used for a symbol which is defined in a regular 199 object. It is set up in size_dynamic_sections. It points to 200 the version information we should write out for this symbol. */ 201 struct bfd_elf_version_tree *vertree; 202 } verinfo; 203 204 struct 205 { 206 /* Virtual table entry use information. This array is nominally of size 207 size/sizeof(target_void_pointer), though we have to be able to assume 208 and track a size while the symbol is still undefined. It is indexed 209 via offset/sizeof(target_void_pointer). */ 210 size_t size; 211 bfd_boolean *used; 212 213 /* Virtual table derivation info. */ 214 struct elf_link_hash_entry *parent; 215 } *vtable; 216}; 217 218/* Will references to this symbol always reference the symbol 219 in this object? STV_PROTECTED is excluded from the visibility test 220 here so that function pointer comparisons work properly. Since 221 function symbols not defined in an app are set to their .plt entry, 222 it's necessary for shared libs to also reference the .plt even 223 though the symbol is really local to the shared lib. */ 224#define SYMBOL_REFERENCES_LOCAL(INFO, H) \ 225 _bfd_elf_symbol_refs_local_p (H, INFO, 0) 226 227/* Will _calls_ to this symbol always call the version in this object? */ 228#define SYMBOL_CALLS_LOCAL(INFO, H) \ 229 _bfd_elf_symbol_refs_local_p (H, INFO, 1) 230 231/* Common symbols that are turned into definitions don't have the 232 DEF_REGULAR flag set, so they might appear to be undefined. */ 233#define ELF_COMMON_DEF_P(H) \ 234 (!(H)->def_regular \ 235 && !(H)->def_dynamic \ 236 && (H)->root.type == bfd_link_hash_defined) 237 238/* Records local symbols to be emitted in the dynamic symbol table. */ 239 240struct elf_link_local_dynamic_entry 241{ 242 struct elf_link_local_dynamic_entry *next; 243 244 /* The input bfd this symbol came from. */ 245 bfd *input_bfd; 246 247 /* The index of the local symbol being copied. */ 248 long input_indx; 249 250 /* The index in the outgoing dynamic symbol table. */ 251 long dynindx; 252 253 /* A copy of the input symbol. */ 254 Elf_Internal_Sym isym; 255}; 256 257struct elf_link_loaded_list 258{ 259 struct elf_link_loaded_list *next; 260 bfd *abfd; 261}; 262 263/* Structures used by the eh_frame optimization code. */ 264struct eh_cie_fde 265{ 266 /* For FDEs, this points to the CIE used. */ 267 struct eh_cie_fde *cie_inf; 268 unsigned int size; 269 unsigned int offset; 270 unsigned int new_offset; 271 unsigned char fde_encoding; 272 unsigned char lsda_encoding; 273 unsigned char lsda_offset; 274 unsigned int cie : 1; 275 unsigned int removed : 1; 276 unsigned int add_augmentation_size : 1; 277 unsigned int add_fde_encoding : 1; 278 unsigned int make_relative : 1; 279 unsigned int make_lsda_relative : 1; 280 unsigned int need_lsda_relative : 1; 281 unsigned int per_encoding_relative : 1; 282 unsigned int *set_loc; 283}; 284 285struct eh_frame_sec_info 286{ 287 unsigned int count; 288 struct eh_cie_fde entry[1]; 289}; 290 291struct eh_frame_array_ent 292{ 293 bfd_vma initial_loc; 294 bfd_vma fde; 295}; 296 297struct htab; 298 299struct eh_frame_hdr_info 300{ 301 struct htab *cies; 302 asection *hdr_sec; 303 unsigned int fde_count, array_count; 304 struct eh_frame_array_ent *array; 305 /* TRUE if .eh_frame_hdr should contain the sorted search table. 306 We build it if we successfully read all .eh_frame input sections 307 and recognize them. */ 308 bfd_boolean table; 309 bfd_boolean offsets_adjusted; 310}; 311 312/* ELF linker hash table. */ 313 314struct elf_link_hash_table 315{ 316 struct bfd_link_hash_table root; 317 318 /* Whether we have created the special dynamic sections required 319 when linking against or generating a shared object. */ 320 bfd_boolean dynamic_sections_created; 321 322 /* True if this target has relocatable executables, so needs dynamic 323 section symbols. */ 324 bfd_boolean is_relocatable_executable; 325 326 /* The BFD used to hold special sections created by the linker. 327 This will be the first BFD found which requires these sections to 328 be created. */ 329 bfd *dynobj; 330 331 /* The value to use when initialising got.refcount/offset and 332 plt.refcount/offset in an elf_link_hash_entry. Set to zero when 333 the values are refcounts. Set to init_got_offset/init_plt_offset 334 in size_dynamic_sections when the values may be offsets. */ 335 union gotplt_union init_got_refcount; 336 union gotplt_union init_plt_refcount; 337 338 /* The value to use for got.refcount/offset and plt.refcount/offset 339 when the values may be offsets. Normally (bfd_vma) -1. */ 340 union gotplt_union init_got_offset; 341 union gotplt_union init_plt_offset; 342 343 /* The number of symbols found in the link which must be put into 344 the .dynsym section. */ 345 bfd_size_type dynsymcount; 346 347 /* The string table of dynamic symbols, which becomes the .dynstr 348 section. */ 349 struct elf_strtab_hash *dynstr; 350 351 /* The number of buckets in the hash table in the .hash section. 352 This is based on the number of dynamic symbols. */ 353 bfd_size_type bucketcount; 354 355 /* A linked list of DT_NEEDED names found in dynamic objects 356 included in the link. */ 357 struct bfd_link_needed_list *needed; 358 359 /* Sections in the output bfd that provides a section symbol 360 to be used by relocations emitted against local symbols. 361 Most targets will not use data_index_section. */ 362 asection *text_index_section; 363 asection *data_index_section; 364 365 /* The _GLOBAL_OFFSET_TABLE_ symbol. */ 366 struct elf_link_hash_entry *hgot; 367 368 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */ 369 struct elf_link_hash_entry *hplt; 370 371 /* A pointer to information used to merge SEC_MERGE sections. */ 372 void *merge_info; 373 374 /* Used to link stabs in sections. */ 375 struct stab_info stab_info; 376 377 /* Used by eh_frame code when editing .eh_frame. */ 378 struct eh_frame_hdr_info eh_info; 379 380 /* A linked list of local symbols to be added to .dynsym. */ 381 struct elf_link_local_dynamic_entry *dynlocal; 382 383 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic 384 objects included in the link. */ 385 struct bfd_link_needed_list *runpath; 386 387 /* Cached first output tls section and size of PT_TLS segment. */ 388 asection *tls_sec; 389 bfd_size_type tls_size; 390 391 /* A linked list of BFD's loaded in the link. */ 392 struct elf_link_loaded_list *loaded; 393}; 394 395/* Look up an entry in an ELF linker hash table. */ 396 397#define elf_link_hash_lookup(table, string, create, copy, follow) \ 398 ((struct elf_link_hash_entry *) \ 399 bfd_link_hash_lookup (&(table)->root, (string), (create), \ 400 (copy), (follow))) 401 402/* Traverse an ELF linker hash table. */ 403 404#define elf_link_hash_traverse(table, func, info) \ 405 (bfd_link_hash_traverse \ 406 (&(table)->root, \ 407 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ 408 (info))) 409 410/* Get the ELF linker hash table from a link_info structure. */ 411 412#define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash)) 413 414/* Returns TRUE if the hash table is a struct elf_link_hash_table. */ 415#define is_elf_hash_table(htab) \ 416 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table) 417 418/* Used by bfd_section_from_r_symndx to cache a small number of local 419 symbol to section mappings. */ 420#define LOCAL_SYM_CACHE_SIZE 32 421struct sym_sec_cache 422{ 423 bfd *abfd; 424 unsigned long indx[LOCAL_SYM_CACHE_SIZE]; 425 asection *sec[LOCAL_SYM_CACHE_SIZE]; 426}; 427 428/* Constant information held for an ELF backend. */ 429 430struct elf_size_info { 431 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr; 432 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note; 433 434 /* The size of entries in the .hash section. */ 435 unsigned char sizeof_hash_entry; 436 437 /* The number of internal relocations to allocate per external 438 relocation entry. */ 439 unsigned char int_rels_per_ext_rel; 440 /* We use some fixed size arrays. This should be large enough to 441 handle all back-ends. */ 442#define MAX_INT_RELS_PER_EXT_REL 3 443 444 unsigned char arch_size, log_file_align; 445 unsigned char elfclass, ev_current; 446 int (*write_out_phdrs) 447 (bfd *, const Elf_Internal_Phdr *, unsigned int); 448 bfd_boolean 449 (*write_shdrs_and_ehdr) (bfd *); 450 void (*write_relocs) 451 (bfd *, asection *, void *); 452 bfd_boolean (*swap_symbol_in) 453 (bfd *, const void *, const void *, Elf_Internal_Sym *); 454 void (*swap_symbol_out) 455 (bfd *, const Elf_Internal_Sym *, void *, void *); 456 bfd_boolean (*slurp_reloc_table) 457 (bfd *, asection *, asymbol **, bfd_boolean); 458 long (*slurp_symbol_table) 459 (bfd *, asymbol **, bfd_boolean); 460 void (*swap_dyn_in) 461 (bfd *, const void *, Elf_Internal_Dyn *); 462 void (*swap_dyn_out) 463 (bfd *, const Elf_Internal_Dyn *, void *); 464 465 /* This function is called to swap in a REL relocation. If an 466 external relocation corresponds to more than one internal 467 relocation, then all relocations are swapped in at once. */ 468 void (*swap_reloc_in) 469 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 470 471 /* This function is called to swap out a REL relocation. */ 472 void (*swap_reloc_out) 473 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 474 475 /* This function is called to swap in a RELA relocation. If an 476 external relocation corresponds to more than one internal 477 relocation, then all relocations are swapped in at once. */ 478 void (*swap_reloca_in) 479 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 480 481 /* This function is called to swap out a RELA relocation. */ 482 void (*swap_reloca_out) 483 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 484}; 485 486#define elf_symbol_from(ABFD,S) \ 487 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \ 488 && (S)->the_bfd->tdata.elf_obj_data != 0) \ 489 ? (elf_symbol_type *) (S) \ 490 : 0) 491 492enum elf_reloc_type_class { 493 reloc_class_normal, 494 reloc_class_relative, 495 reloc_class_plt, 496 reloc_class_copy 497}; 498 499struct elf_reloc_cookie 500{ 501 Elf_Internal_Rela *rels, *rel, *relend; 502 Elf_Internal_Sym *locsyms; 503 bfd *abfd; 504 size_t locsymcount; 505 size_t extsymoff; 506 struct elf_link_hash_entry **sym_hashes; 507 int r_sym_shift; 508 bfd_boolean bad_symtab; 509}; 510 511/* The level of IRIX compatibility we're striving for. */ 512 513typedef enum { 514 ict_none, 515 ict_irix5, 516 ict_irix6 517} irix_compat_t; 518 519/* Mapping of ELF section names and types. */ 520struct bfd_elf_special_section 521{ 522 const char *prefix; 523 int prefix_length; 524 /* 0 means name must match PREFIX exactly. 525 -1 means name must start with PREFIX followed by an arbitrary string. 526 -2 means name must match PREFIX exactly or consist of PREFIX followed 527 by a dot then anything. 528 > 0 means name must start with the first PREFIX_LENGTH chars of 529 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */ 530 int suffix_length; 531 int type; 532 int attr; 533}; 534 535enum action_discarded 536 { 537 COMPLAIN = 1, 538 PRETEND = 2 539 }; 540 541typedef asection * (*elf_gc_mark_hook_fn) 542 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 543 struct elf_link_hash_entry *, Elf_Internal_Sym *); 544 545struct elf_backend_data 546{ 547 /* The architecture for this backend. */ 548 enum bfd_architecture arch; 549 550 /* The ELF machine code (EM_xxxx) for this backend. */ 551 int elf_machine_code; 552 553 /* EI_OSABI. */ 554 int elf_osabi; 555 556 /* The maximum page size for this backend. */ 557 bfd_vma maxpagesize; 558 559 /* The minimum page size for this backend. An input object will not be 560 considered page aligned unless its sections are correctly aligned for 561 pages at least this large. May be smaller than maxpagesize. */ 562 bfd_vma minpagesize; 563 564 /* The common page size for this backend. */ 565 bfd_vma commonpagesize; 566 567 /* The BFD flags applied to sections created for dynamic linking. */ 568 flagword dynamic_sec_flags; 569 570 /* A function to translate an ELF RELA relocation to a BFD arelent 571 structure. */ 572 void (*elf_info_to_howto) 573 (bfd *, arelent *, Elf_Internal_Rela *); 574 575 /* A function to translate an ELF REL relocation to a BFD arelent 576 structure. */ 577 void (*elf_info_to_howto_rel) 578 (bfd *, arelent *, Elf_Internal_Rela *); 579 580 /* A function to determine whether a symbol is global when 581 partitioning the symbol table into local and global symbols. 582 This should be NULL for most targets, in which case the correct 583 thing will be done. MIPS ELF, at least on the Irix 5, has 584 special requirements. */ 585 bfd_boolean (*elf_backend_sym_is_global) 586 (bfd *, asymbol *); 587 588 /* The remaining functions are hooks which are called only if they 589 are not NULL. */ 590 591 /* A function to permit a backend specific check on whether a 592 particular BFD format is relevant for an object file, and to 593 permit the backend to set any global information it wishes. When 594 this is called elf_elfheader is set, but anything else should be 595 used with caution. If this returns FALSE, the check_format 596 routine will return a bfd_error_wrong_format error. */ 597 bfd_boolean (*elf_backend_object_p) 598 (bfd *); 599 600 /* A function to do additional symbol processing when reading the 601 ELF symbol table. This is where any processor-specific special 602 section indices are handled. */ 603 void (*elf_backend_symbol_processing) 604 (bfd *, asymbol *); 605 606 /* A function to do additional symbol processing after reading the 607 entire ELF symbol table. */ 608 bfd_boolean (*elf_backend_symbol_table_processing) 609 (bfd *, elf_symbol_type *, unsigned int); 610 611 /* A function to set the type of the info field. Processor-specific 612 types should be handled here. */ 613 int (*elf_backend_get_symbol_type) 614 (Elf_Internal_Sym *, int); 615 616 /* A function to return the linker hash table entry of a symbol that 617 might be satisfied by an archive symbol. */ 618 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup) 619 (bfd *, struct bfd_link_info *, const char *); 620 621 /* Return true if local section symbols should have a non-null st_name. 622 NULL implies false. */ 623 bfd_boolean (*elf_backend_name_local_section_symbols) 624 (bfd *); 625 626 /* A function to do additional processing on the ELF section header 627 just before writing it out. This is used to set the flags and 628 type fields for some sections, or to actually write out data for 629 unusual sections. */ 630 bfd_boolean (*elf_backend_section_processing) 631 (bfd *, Elf_Internal_Shdr *); 632 633 /* A function to handle unusual section types when creating BFD 634 sections from ELF sections. */ 635 bfd_boolean (*elf_backend_section_from_shdr) 636 (bfd *, Elf_Internal_Shdr *, const char *, int); 637 638 /* A function to convert machine dependent ELF section header flags to 639 BFD internal section header flags. */ 640 bfd_boolean (*elf_backend_section_flags) 641 (flagword *, const Elf_Internal_Shdr *); 642 643 /* A function that returns a struct containing ELF section flags and 644 type for the given BFD section. */ 645 const struct bfd_elf_special_section * (*get_sec_type_attr) 646 (bfd *, asection *); 647 648 /* A function to handle unusual program segment types when creating BFD 649 sections from ELF program segments. */ 650 bfd_boolean (*elf_backend_section_from_phdr) 651 (bfd *, Elf_Internal_Phdr *, int, const char *); 652 653 /* A function to set up the ELF section header for a BFD section in 654 preparation for writing it out. This is where the flags and type 655 fields are set for unusual sections. */ 656 bfd_boolean (*elf_backend_fake_sections) 657 (bfd *, Elf_Internal_Shdr *, asection *); 658 659 /* A function to get the ELF section index for a BFD section. If 660 this returns TRUE, the section was found. If it is a normal ELF 661 section, *RETVAL should be left unchanged. If it is not a normal 662 ELF section *RETVAL should be set to the SHN_xxxx index. */ 663 bfd_boolean (*elf_backend_section_from_bfd_section) 664 (bfd *, asection *, int *retval); 665 666 /* If this field is not NULL, it is called by the add_symbols phase 667 of a link just before adding a symbol to the global linker hash 668 table. It may modify any of the fields as it wishes. If *NAME 669 is set to NULL, the symbol will be skipped rather than being 670 added to the hash table. This function is responsible for 671 handling all processor dependent symbol bindings and section 672 indices, and must set at least *FLAGS and *SEC for each processor 673 dependent case; failure to do so will cause a link error. */ 674 bfd_boolean (*elf_add_symbol_hook) 675 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *, 676 const char **name, flagword *flags, asection **sec, bfd_vma *value); 677 678 /* If this field is not NULL, it is called by the elf_link_output_sym 679 phase of a link for each symbol which will appear in the object file. */ 680 bfd_boolean (*elf_backend_link_output_symbol_hook) 681 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *, 682 asection *, struct elf_link_hash_entry *); 683 684 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend 685 linker the first time it encounters a dynamic object in the link. 686 This function must create any sections required for dynamic 687 linking. The ABFD argument is a dynamic object. The .interp, 688 .dynamic, .dynsym, .dynstr, and .hash functions have already been 689 created, and this function may modify the section flags if 690 desired. This function will normally create the .got and .plt 691 sections, but different backends have different requirements. */ 692 bfd_boolean (*elf_backend_create_dynamic_sections) 693 (bfd *abfd, struct bfd_link_info *info); 694 695 /* When creating a shared library, determine whether to omit the 696 dynamic symbol for the section. */ 697 bfd_boolean (*elf_backend_omit_section_dynsym) 698 (bfd *output_bfd, struct bfd_link_info *info, asection *osec); 699 700 /* Return TRUE if relocations of targets are compatible to the extent 701 that CHECK_RELOCS will properly process them. PR 4424. */ 702 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *); 703 704 /* The CHECK_RELOCS function is called by the add_symbols phase of 705 the ELF backend linker. It is called once for each section with 706 relocs of an object file, just after the symbols for the object 707 file have been added to the global linker hash table. The 708 function must look through the relocs and do any special handling 709 required. This generally means allocating space in the global 710 offset table, and perhaps allocating space for a reloc. The 711 relocs are always passed as Rela structures; if the section 712 actually uses Rel structures, the r_addend field will always be 713 zero. */ 714 bfd_boolean (*check_relocs) 715 (bfd *abfd, struct bfd_link_info *info, asection *o, 716 const Elf_Internal_Rela *relocs); 717 718 /* The CHECK_DIRECTIVES function is called once per input file by 719 the add_symbols phase of the ELF backend linker. The function 720 must inspect the bfd and create any additional symbols according 721 to any custom directives in the bfd. */ 722 bfd_boolean (*check_directives) 723 (bfd *abfd, struct bfd_link_info *info); 724 725 /* The AS_NEEDED_CLEANUP function is called once per --as-needed 726 input file that was not needed by the add_symbols phase of the 727 ELF backend linker. The function must undo any target specific 728 changes in the symbol hash table. */ 729 bfd_boolean (*as_needed_cleanup) 730 (bfd *abfd, struct bfd_link_info *info); 731 732 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend 733 linker for every symbol which is defined by a dynamic object and 734 referenced by a regular object. This is called after all the 735 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS 736 function has been called. The hash table entry should be 737 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be 738 defined in a section from a dynamic object. Dynamic object 739 sections are not included in the final link, and this function is 740 responsible for changing the value to something which the rest of 741 the link can deal with. This will normally involve adding an 742 entry to the .plt or .got or some such section, and setting the 743 symbol to point to that. */ 744 bfd_boolean (*elf_backend_adjust_dynamic_symbol) 745 (struct bfd_link_info *info, struct elf_link_hash_entry *h); 746 747 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker 748 after all the linker input files have been seen but before the 749 section sizes have been set. This is called after 750 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */ 751 bfd_boolean (*elf_backend_always_size_sections) 752 (bfd *output_bfd, struct bfd_link_info *info); 753 754 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend 755 linker after all the linker input files have been seen but before 756 the sections sizes have been set. This is called after 757 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols. 758 It is only called when linking against a dynamic object. It must 759 set the sizes of the dynamic sections, and may fill in their 760 contents as well. The generic ELF linker can handle the .dynsym, 761 .dynstr and .hash sections. This function must handle the 762 .interp section and any sections created by the 763 CREATE_DYNAMIC_SECTIONS entry point. */ 764 bfd_boolean (*elf_backend_size_dynamic_sections) 765 (bfd *output_bfd, struct bfd_link_info *info); 766 767 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections 768 we keep to use as a base for relocs and symbols. */ 769 void (*elf_backend_init_index_section) 770 (bfd *output_bfd, struct bfd_link_info *info); 771 772 /* The RELOCATE_SECTION function is called by the ELF backend linker 773 to handle the relocations for a section. 774 775 The relocs are always passed as Rela structures; if the section 776 actually uses Rel structures, the r_addend field will always be 777 zero. 778 779 This function is responsible for adjust the section contents as 780 necessary, and (if using Rela relocs and generating a 781 relocatable output file) adjusting the reloc addend as 782 necessary. 783 784 This function does not have to worry about setting the reloc 785 address or the reloc symbol index. 786 787 LOCAL_SYMS is a pointer to the swapped in local symbols. 788 789 LOCAL_SECTIONS is an array giving the section in the input file 790 corresponding to the st_shndx field of each local symbol. 791 792 The global hash table entry for the global symbols can be found 793 via elf_sym_hashes (input_bfd). 794 795 When generating relocatable output, this function must handle 796 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 797 going to be the section symbol corresponding to the output 798 section, which means that the addend must be adjusted 799 accordingly. 800 801 Returns FALSE on error, TRUE on success, 2 if successful and 802 relocations should be written for this section. */ 803 int (*elf_backend_relocate_section) 804 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd, 805 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs, 806 Elf_Internal_Sym *local_syms, asection **local_sections); 807 808 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend 809 linker just before it writes a symbol out to the .dynsym section. 810 The processor backend may make any required adjustment to the 811 symbol. It may also take the opportunity to set contents of the 812 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on 813 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called 814 on those symbols which are defined by a dynamic object. */ 815 bfd_boolean (*elf_backend_finish_dynamic_symbol) 816 (bfd *output_bfd, struct bfd_link_info *info, 817 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym); 818 819 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend 820 linker just before it writes all the dynamic sections out to the 821 output file. The FINISH_DYNAMIC_SYMBOL will have been called on 822 all dynamic symbols. */ 823 bfd_boolean (*elf_backend_finish_dynamic_sections) 824 (bfd *output_bfd, struct bfd_link_info *info); 825 826 /* A function to do any beginning processing needed for the ELF file 827 before building the ELF headers and computing file positions. */ 828 void (*elf_backend_begin_write_processing) 829 (bfd *, struct bfd_link_info *); 830 831 /* A function to do any final processing needed for the ELF file 832 before writing it out. The LINKER argument is TRUE if this BFD 833 was created by the ELF backend linker. */ 834 void (*elf_backend_final_write_processing) 835 (bfd *, bfd_boolean linker); 836 837 /* This function is called by get_program_header_size. It should 838 return the number of additional program segments which this BFD 839 will need. It should return -1 on error. */ 840 int (*elf_backend_additional_program_headers) 841 (bfd *, struct bfd_link_info *); 842 843 /* This function is called to modify an existing segment map in a 844 backend specific fashion. */ 845 bfd_boolean (*elf_backend_modify_segment_map) 846 (bfd *, struct bfd_link_info *); 847 848 /* This function is called to modify program headers just before 849 they are written. */ 850 bfd_boolean (*elf_backend_modify_program_headers) 851 (bfd *, struct bfd_link_info *); 852 853 /* This function is called during section garbage collection to 854 mark sections that define global symbols. */ 855 bfd_boolean (*gc_mark_dynamic_ref) 856 (struct elf_link_hash_entry *h, void *inf); 857 858 /* This function is called during section gc to discover the section a 859 particular relocation refers to. */ 860 elf_gc_mark_hook_fn gc_mark_hook; 861 862 /* This function, if defined, is called after the first gc marking pass 863 to allow the backend to mark additional sections. */ 864 bfd_boolean (*gc_mark_extra_sections) 865 (struct bfd_link_info *info, elf_gc_mark_hook_fn gc_mark_hook); 866 867 /* This function, if defined, is called during the sweep phase of gc 868 in order that a backend might update any data structures it might 869 be maintaining. */ 870 bfd_boolean (*gc_sweep_hook) 871 (bfd *abfd, struct bfd_link_info *info, asection *o, 872 const Elf_Internal_Rela *relocs); 873 874 /* This function, if defined, is called after the ELF headers have 875 been created. This allows for things like the OS and ABI versions 876 to be changed. */ 877 void (*elf_backend_post_process_headers) 878 (bfd *, struct bfd_link_info *); 879 880 /* This function, if defined, prints a symbol to file and returns the 881 name of the symbol to be printed. It should return NULL to fall 882 back to default symbol printing. */ 883 const char *(*elf_backend_print_symbol_all) 884 (bfd *, void *, asymbol *); 885 886 /* This function, if defined, is called after all local symbols and 887 global symbols converted to locals are emitted into the symtab 888 section. It allows the backend to emit special local symbols 889 not handled in the hash table. */ 890 bfd_boolean (*elf_backend_output_arch_local_syms) 891 (bfd *, struct bfd_link_info *, void *, 892 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 893 struct elf_link_hash_entry *)); 894 895 /* This function, if defined, is called after all symbols are emitted 896 into the symtab section. It allows the backend to emit special 897 global symbols not handled in the hash table. */ 898 bfd_boolean (*elf_backend_output_arch_syms) 899 (bfd *, struct bfd_link_info *, void *, 900 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 901 struct elf_link_hash_entry *)); 902 903 /* Copy any information related to dynamic linking from a pre-existing 904 symbol to a newly created symbol. Also called to copy flags and 905 other back-end info to a weakdef, in which case the symbol is not 906 newly created and plt/got refcounts and dynamic indices should not 907 be copied. */ 908 void (*elf_backend_copy_indirect_symbol) 909 (struct bfd_link_info *, struct elf_link_hash_entry *, 910 struct elf_link_hash_entry *); 911 912 /* Modify any information related to dynamic linking such that the 913 symbol is not exported. */ 914 void (*elf_backend_hide_symbol) 915 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 916 917 /* A function to do additional symbol fixup, called by 918 _bfd_elf_fix_symbol_flags. */ 919 bfd_boolean (*elf_backend_fixup_symbol) 920 (struct bfd_link_info *, struct elf_link_hash_entry *); 921 922 /* Merge the backend specific symbol attribute. */ 923 void (*elf_backend_merge_symbol_attribute) 924 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean, 925 bfd_boolean); 926 927 /* Decide whether an undefined symbol is special and can be ignored. 928 This is the case for OPTIONAL symbols on IRIX. */ 929 bfd_boolean (*elf_backend_ignore_undef_symbol) 930 (struct elf_link_hash_entry *); 931 932 /* Emit relocations. Overrides default routine for emitting relocs, 933 except during a relocatable link, or if all relocs are being emitted. */ 934 bfd_boolean (*elf_backend_emit_relocs) 935 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 936 struct elf_link_hash_entry **); 937 938 /* Count relocations. Not called for relocatable links 939 or if all relocs are being preserved in the output. */ 940 unsigned int (*elf_backend_count_relocs) 941 (asection *, Elf_Internal_Rela *); 942 943 /* This function, if defined, is called when an NT_PRSTATUS note is found 944 in a core file. */ 945 bfd_boolean (*elf_backend_grok_prstatus) 946 (bfd *, Elf_Internal_Note *); 947 948 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO 949 note is found in a core file. */ 950 bfd_boolean (*elf_backend_grok_psinfo) 951 (bfd *, Elf_Internal_Note *); 952 953 /* This function, if defined, is called to write a note to a corefile. */ 954 char *(*elf_backend_write_core_note) 955 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...); 956 957 /* Functions to print VMAs. Special code to handle 64 bit ELF files. */ 958 void (* elf_backend_sprintf_vma) 959 (bfd *, char *, bfd_vma); 960 void (* elf_backend_fprintf_vma) 961 (bfd *, void *, bfd_vma); 962 963 /* This function returns class of a reloc type. */ 964 enum elf_reloc_type_class (*elf_backend_reloc_type_class) 965 (const Elf_Internal_Rela *); 966 967 /* This function, if defined, removes information about discarded functions 968 from other sections which mention them. */ 969 bfd_boolean (*elf_backend_discard_info) 970 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *); 971 972 /* This function, if defined, signals that the function above has removed 973 the discarded relocations for this section. */ 974 bfd_boolean (*elf_backend_ignore_discarded_relocs) 975 (asection *); 976 977 /* What to do when ld finds relocations against symbols defined in 978 discarded sections. */ 979 unsigned int (*action_discarded) 980 (asection *); 981 982 /* This function returns the width of FDE pointers in bytes, or 0 if 983 that can't be determined for some reason. The default definition 984 goes by the bfd's EI_CLASS. */ 985 unsigned int (*elf_backend_eh_frame_address_size) 986 (bfd *, asection *); 987 988 /* These functions tell elf-eh-frame whether to attempt to turn 989 absolute or lsda encodings into pc-relative ones. The default 990 definition enables these transformations. */ 991 bfd_boolean (*elf_backend_can_make_relative_eh_frame) 992 (bfd *, struct bfd_link_info *, asection *); 993 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame) 994 (bfd *, struct bfd_link_info *, asection *); 995 996 /* This function returns an encoding after computing the encoded 997 value (and storing it in ENCODED) for the given OFFSET into OSEC, 998 to be stored in at LOC_OFFSET into the LOC_SEC input section. 999 The default definition chooses a 32-bit PC-relative encoding. */ 1000 bfd_byte (*elf_backend_encode_eh_address) 1001 (bfd *abfd, struct bfd_link_info *info, 1002 asection *osec, bfd_vma offset, 1003 asection *loc_sec, bfd_vma loc_offset, 1004 bfd_vma *encoded); 1005 1006 /* This function, if defined, may write out the given section. 1007 Returns TRUE if it did so and FALSE if the caller should. */ 1008 bfd_boolean (*elf_backend_write_section) 1009 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 1010 1011 /* The level of IRIX compatibility we're striving for. 1012 MIPS ELF specific function. */ 1013 irix_compat_t (*elf_backend_mips_irix_compat) 1014 (bfd *); 1015 1016 reloc_howto_type *(*elf_backend_mips_rtype_to_howto) 1017 (unsigned int, bfd_boolean); 1018 1019 /* The swapping table to use when dealing with ECOFF information. 1020 Used for the MIPS ELF .mdebug section. */ 1021 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap; 1022 1023 /* This function implements `bfd_elf_bfd_from_remote_memory'; 1024 see elf.c, elfcode.h. */ 1025 bfd *(*elf_backend_bfd_from_remote_memory) 1026 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep, 1027 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len)); 1028 1029 /* This function is used by `_bfd_elf_get_synthetic_symtab'; 1030 see elf.c. */ 1031 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *); 1032 1033 /* Is symbol defined in common section? */ 1034 bfd_boolean (*common_definition) (Elf_Internal_Sym *); 1035 1036 /* Return a common section index for section. */ 1037 unsigned int (*common_section_index) (asection *); 1038 1039 /* Return a common section for section. */ 1040 asection *(*common_section) (asection *); 1041 1042 /* Return TRUE if we can merge 2 definitions. */ 1043 bfd_boolean (*merge_symbol) (struct bfd_link_info *, 1044 struct elf_link_hash_entry **, 1045 struct elf_link_hash_entry *, 1046 Elf_Internal_Sym *, asection **, 1047 bfd_vma *, unsigned int *, 1048 bfd_boolean *, bfd_boolean *, 1049 bfd_boolean *, bfd_boolean *, 1050 bfd_boolean *, bfd_boolean *, 1051 bfd_boolean *, bfd_boolean *, 1052 bfd *, asection **, 1053 bfd_boolean *, bfd_boolean *, 1054 bfd_boolean *, bfd_boolean *, 1055 bfd *, asection **); 1056 1057 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 1058 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *); 1059 1060 /* Return TRUE if type is a function symbol type. */ 1061 bfd_boolean (*is_function_type) (unsigned int type); 1062 1063 /* Used to handle bad SHF_LINK_ORDER input. */ 1064 bfd_error_handler_type link_order_error_handler; 1065 1066 /* Name of the PLT relocation section. */ 1067 const char *relplt_name; 1068 1069 /* Alternate EM_xxxx machine codes for this backend. */ 1070 int elf_machine_alt1; 1071 int elf_machine_alt2; 1072 1073 const struct elf_size_info *s; 1074 1075 /* An array of target specific special sections. */ 1076 const struct bfd_elf_special_section *special_sections; 1077 1078 /* The size in bytes of the header for the GOT. This includes the 1079 so-called reserved entries on some systems. */ 1080 bfd_vma got_header_size; 1081 1082 /* The vendor name to use for a processor-standard attributes section. */ 1083 const char *obj_attrs_vendor; 1084 1085 /* The section name to use for a processor-standard attributes section. */ 1086 const char *obj_attrs_section; 1087 1088 /* Return 1, 2 or 3 to indicate what type of arguments a 1089 processor-specific tag takes. */ 1090 int (*obj_attrs_arg_type) (int); 1091 1092 /* The section type to use for an attributes section. */ 1093 unsigned int obj_attrs_section_type; 1094 1095 /* This is TRUE if the linker should act like collect and gather 1096 global constructors and destructors by name. This is TRUE for 1097 MIPS ELF because the Irix 5 tools can not handle the .init 1098 section. */ 1099 unsigned collect : 1; 1100 1101 /* This is TRUE if the linker should ignore changes to the type of a 1102 symbol. This is TRUE for MIPS ELF because some Irix 5 objects 1103 record undefined functions as STT_OBJECT although the definitions 1104 are STT_FUNC. */ 1105 unsigned type_change_ok : 1; 1106 1107 /* Whether the backend may use REL relocations. (Some backends use 1108 both REL and RELA relocations, and this flag is set for those 1109 backends.) */ 1110 unsigned may_use_rel_p : 1; 1111 1112 /* Whether the backend may use RELA relocations. (Some backends use 1113 both REL and RELA relocations, and this flag is set for those 1114 backends.) */ 1115 unsigned may_use_rela_p : 1; 1116 1117 /* Whether the default relocation type is RELA. If a backend with 1118 this flag set wants REL relocations for a particular section, 1119 it must note that explicitly. Similarly, if this flag is clear, 1120 and the backend wants RELA relocations for a particular 1121 section. */ 1122 unsigned default_use_rela_p : 1; 1123 1124 /* Set if RELA relocations for a relocatable link can be handled by 1125 generic code. Backends that set this flag need do nothing in the 1126 backend relocate_section routine for relocatable linking. */ 1127 unsigned rela_normal : 1; 1128 1129 /* TRUE if addresses "naturally" sign extend. This is used when 1130 swapping in from Elf32 when BFD64. */ 1131 unsigned sign_extend_vma : 1; 1132 1133 unsigned want_got_plt : 1; 1134 unsigned plt_readonly : 1; 1135 unsigned want_plt_sym : 1; 1136 unsigned plt_not_loaded : 1; 1137 unsigned plt_alignment : 4; 1138 unsigned can_gc_sections : 1; 1139 unsigned can_refcount : 1; 1140 unsigned want_got_sym : 1; 1141 unsigned want_dynbss : 1; 1142 1143 /* Targets which do not support physical addressing often require 1144 that the p_paddr field in the section header to be set to zero. 1145 This field indicates whether this behavior is required. */ 1146 unsigned want_p_paddr_set_to_zero : 1; 1147 1148 /* True if an object file lacking a .note.GNU-stack section 1149 should be assumed to be requesting exec stack. At least one 1150 other file in the link needs to have a .note.GNU-stack section 1151 for a PT_GNU_STACK segment to be created. */ 1152 unsigned default_execstack : 1; 1153}; 1154 1155/* Information stored for each BFD section in an ELF file. This 1156 structure is allocated by elf_new_section_hook. */ 1157 1158struct bfd_elf_section_data 1159{ 1160 /* The ELF header for this section. */ 1161 Elf_Internal_Shdr this_hdr; 1162 1163 /* The ELF header for the reloc section associated with this 1164 section, if any. */ 1165 Elf_Internal_Shdr rel_hdr; 1166 1167 /* If there is a second reloc section associated with this section, 1168 as can happen on Irix 6, this field points to the header. */ 1169 Elf_Internal_Shdr *rel_hdr2; 1170 1171 /* The number of relocations currently assigned to REL_HDR. */ 1172 unsigned int rel_count; 1173 1174 /* The number of relocations currently assigned to REL_HDR2. */ 1175 unsigned int rel_count2; 1176 1177 /* The ELF section number of this section. */ 1178 int this_idx; 1179 1180 /* The ELF section number of the reloc section indicated by 1181 REL_HDR if any. Only used for an output file. */ 1182 int rel_idx; 1183 1184 /* The ELF section number of the reloc section indicated by 1185 REL_HDR2 if any. Only used for an output file. */ 1186 int rel_idx2; 1187 1188 /* Used by the backend linker when generating a shared library to 1189 record the dynamic symbol index for a section symbol 1190 corresponding to this section. A value of 0 means that there is 1191 no dynamic symbol for this section. */ 1192 int dynindx; 1193 1194 /* A pointer to the linked-to section for SHF_LINK_ORDER. */ 1195 asection *linked_to; 1196 1197 /* Used by the backend linker to store the symbol hash table entries 1198 associated with relocs against global symbols. */ 1199 struct elf_link_hash_entry **rel_hashes; 1200 1201 /* A pointer to the swapped relocs. If the section uses REL relocs, 1202 rather than RELA, all the r_addend fields will be zero. This 1203 pointer may be NULL. It is used by the backend linker. */ 1204 Elf_Internal_Rela *relocs; 1205 1206 /* A pointer to a linked list tracking dynamic relocs copied for 1207 local symbols. */ 1208 void *local_dynrel; 1209 1210 /* A pointer to the bfd section used for dynamic relocs. */ 1211 asection *sreloc; 1212 1213 union { 1214 /* Group name, if this section is a member of a group. */ 1215 const char *name; 1216 1217 /* Group signature sym, if this is the SHT_GROUP section. */ 1218 struct bfd_symbol *id; 1219 } group; 1220 1221 /* For a member of a group, points to the SHT_GROUP section. 1222 NULL for the SHT_GROUP section itself and non-group sections. */ 1223 asection *sec_group; 1224 1225 /* A linked list of member sections in the group. Circular when used by 1226 the linker. For the SHT_GROUP section, points at first member. */ 1227 asection *next_in_group; 1228 1229 /* A pointer used for various section optimizations. */ 1230 void *sec_info; 1231}; 1232 1233#define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd) 1234#define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to) 1235#define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type) 1236#define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags) 1237#define elf_group_name(sec) (elf_section_data(sec)->group.name) 1238#define elf_group_id(sec) (elf_section_data(sec)->group.id) 1239#define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group) 1240#define elf_sec_group(sec) (elf_section_data(sec)->sec_group) 1241 1242#define xvec_get_elf_backend_data(xvec) \ 1243 ((struct elf_backend_data *) (xvec)->backend_data) 1244 1245#define get_elf_backend_data(abfd) \ 1246 xvec_get_elf_backend_data ((abfd)->xvec) 1247 1248/* This struct is used to pass information to routines called via 1249 elf_link_hash_traverse which must return failure. */ 1250 1251struct elf_info_failed 1252{ 1253 bfd_boolean failed; 1254 struct bfd_link_info *info; 1255 struct bfd_elf_version_tree *verdefs; 1256}; 1257 1258/* This structure is used to pass information to 1259 _bfd_elf_link_assign_sym_version. */ 1260 1261struct elf_assign_sym_version_info 1262{ 1263 /* Output BFD. */ 1264 bfd *output_bfd; 1265 /* General link information. */ 1266 struct bfd_link_info *info; 1267 /* Version tree. */ 1268 struct bfd_elf_version_tree *verdefs; 1269 /* Whether we had a failure. */ 1270 bfd_boolean failed; 1271}; 1272 1273/* This structure is used to pass information to 1274 _bfd_elf_link_find_version_dependencies. */ 1275 1276struct elf_find_verdep_info 1277{ 1278 /* Output BFD. */ 1279 bfd *output_bfd; 1280 /* General link information. */ 1281 struct bfd_link_info *info; 1282 /* The number of dependencies. */ 1283 unsigned int vers; 1284 /* Whether we had a failure. */ 1285 bfd_boolean failed; 1286}; 1287 1288/* The maximum number of known object attributes for any target. */ 1289#define NUM_KNOWN_OBJ_ATTRIBUTES 32 1290 1291/* The value of an object attribute. type & 1 indicates whether there 1292 is an integer value; type & 2 indicates whether there is a string 1293 value. */ 1294 1295typedef struct obj_attribute 1296{ 1297 int type; 1298 unsigned int i; 1299 char *s; 1300} obj_attribute; 1301 1302typedef struct obj_attribute_list 1303{ 1304 struct obj_attribute_list *next; 1305 int tag; 1306 obj_attribute attr; 1307} obj_attribute_list; 1308 1309/* Object attributes may either be defined by the processor ABI, index 1310 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific 1311 (and possibly also processor-specific), index OBJ_ATTR_GNU. */ 1312#define OBJ_ATTR_PROC 0 1313#define OBJ_ATTR_GNU 1 1314#define OBJ_ATTR_FIRST OBJ_ATTR_PROC 1315#define OBJ_ATTR_LAST OBJ_ATTR_GNU 1316 1317/* The following object attribute tags are taken as generic, for all 1318 targets and for "gnu" where there is no target standard. */ 1319enum 1320{ 1321 Tag_NULL = 0, 1322 Tag_File = 1, 1323 Tag_Section = 2, 1324 Tag_Symbol = 3, 1325 Tag_compatibility = 32 1326}; 1327 1328/* Some private data is stashed away for future use using the tdata pointer 1329 in the bfd structure. */ 1330 1331struct elf_obj_tdata 1332{ 1333 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */ 1334 Elf_Internal_Shdr **elf_sect_ptr; 1335 Elf_Internal_Phdr *phdr; 1336 struct elf_segment_map *segment_map; 1337 struct elf_strtab_hash *strtab_ptr; 1338 int num_locals; 1339 int num_globals; 1340 unsigned int num_elf_sections; /* elf_sect_ptr size */ 1341 int num_section_syms; 1342 asymbol **section_syms; /* STT_SECTION symbols for each section */ 1343 Elf_Internal_Shdr symtab_hdr; 1344 Elf_Internal_Shdr shstrtab_hdr; 1345 Elf_Internal_Shdr strtab_hdr; 1346 Elf_Internal_Shdr dynsymtab_hdr; 1347 Elf_Internal_Shdr dynstrtab_hdr; 1348 Elf_Internal_Shdr dynversym_hdr; 1349 Elf_Internal_Shdr dynverref_hdr; 1350 Elf_Internal_Shdr dynverdef_hdr; 1351 Elf_Internal_Shdr symtab_shndx_hdr; 1352 unsigned int symtab_section, shstrtab_section; 1353 unsigned int strtab_section, dynsymtab_section; 1354 unsigned int symtab_shndx_section; 1355 unsigned int dynversym_section, dynverdef_section, dynverref_section; 1356 file_ptr next_file_pos; 1357 bfd_vma gp; /* The gp value */ 1358 unsigned int gp_size; /* The gp size */ 1359 1360 /* Information grabbed from an elf core file. */ 1361 int core_signal; 1362 int core_pid; 1363 int core_lwpid; 1364 char* core_program; 1365 char* core_command; 1366 1367 /* A mapping from external symbols to entries in the linker hash 1368 table, used when linking. This is indexed by the symbol index 1369 minus the sh_info field of the symbol table header. */ 1370 struct elf_link_hash_entry **sym_hashes; 1371 1372 /* Track usage and final offsets of GOT entries for local symbols. 1373 This array is indexed by symbol index. Elements are used 1374 identically to "got" in struct elf_link_hash_entry. */ 1375 union 1376 { 1377 bfd_signed_vma *refcounts; 1378 bfd_vma *offsets; 1379 struct got_entry **ents; 1380 } local_got; 1381 1382 /* The linker ELF emulation code needs to let the backend ELF linker 1383 know what filename should be used for a dynamic object if the 1384 dynamic object is found using a search. The emulation code then 1385 sometimes needs to know what name was actually used. Until the 1386 file has been added to the linker symbol table, this field holds 1387 the name the linker wants. After it has been added, it holds the 1388 name actually used, which will be the DT_SONAME entry if there is 1389 one. */ 1390 const char *dt_name; 1391 1392 /* Records the result of `get_program_header_size'. */ 1393 bfd_size_type program_header_size; 1394 1395 /* Used by find_nearest_line entry point. */ 1396 void *line_info; 1397 1398 /* Used by MIPS ELF find_nearest_line entry point. The structure 1399 could be included directly in this one, but there's no point to 1400 wasting the memory just for the infrequently called 1401 find_nearest_line. */ 1402 struct mips_elf_find_line *find_line_info; 1403 1404 /* A place to stash dwarf1 info for this bfd. */ 1405 struct dwarf1_debug *dwarf1_find_line_info; 1406 1407 /* A place to stash dwarf2 info for this bfd. */ 1408 void *dwarf2_find_line_info; 1409 1410 /* An array of stub sections indexed by symbol number, used by the 1411 MIPS ELF linker. FIXME: We should figure out some way to only 1412 include this field for a MIPS ELF target. */ 1413 asection **local_stubs; 1414 asection **local_call_stubs; 1415 1416 /* Used to determine if PT_GNU_EH_FRAME segment header should be 1417 created. */ 1418 asection *eh_frame_hdr; 1419 1420 Elf_Internal_Shdr **group_sect_ptr; 1421 int num_group; 1422 1423 /* Number of symbol version definitions we are about to emit. */ 1424 unsigned int cverdefs; 1425 1426 /* Number of symbol version references we are about to emit. */ 1427 unsigned int cverrefs; 1428 1429 /* Segment flags for the PT_GNU_STACK segment. */ 1430 unsigned int stack_flags; 1431 1432 /* Should the PT_GNU_RELRO segment be emitted? */ 1433 bfd_boolean relro; 1434 1435 /* Symbol version definitions in external objects. */ 1436 Elf_Internal_Verdef *verdef; 1437 1438 /* Symbol version references to external objects. */ 1439 Elf_Internal_Verneed *verref; 1440 1441 /* The Irix 5 support uses two virtual sections, which represent 1442 text/data symbols defined in dynamic objects. */ 1443 asymbol *elf_data_symbol; 1444 asymbol *elf_text_symbol; 1445 asection *elf_data_section; 1446 asection *elf_text_section; 1447 1448 /* Whether a dyanmic object was specified normally on the linker 1449 command line, or was specified when --as-needed was in effect, 1450 or was found via a DT_NEEDED entry. */ 1451 enum dynamic_lib_link_class dyn_lib_class; 1452 1453 /* This is set to TRUE if the object was created by the backend 1454 linker. */ 1455 bfd_boolean linker; 1456 1457 /* Irix 5 often screws up the symbol table, sorting local symbols 1458 after global symbols. This flag is set if the symbol table in 1459 this BFD appears to be screwed up. If it is, we ignore the 1460 sh_info field in the symbol table header, and always read all the 1461 symbols. */ 1462 bfd_boolean bad_symtab; 1463 1464 /* Used to determine if the e_flags field has been initialized */ 1465 bfd_boolean flags_init; 1466 1467 /* Symbol buffer. */ 1468 void *symbuf; 1469 1470 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES]; 1471 obj_attribute_list *other_obj_attributes[2]; 1472}; 1473 1474#define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data) 1475#define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header) 1476#define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr) 1477#define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections) 1478#define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr) 1479#define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section) 1480#define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section) 1481#define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section) 1482#define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section) 1483#define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section) 1484#define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section) 1485#define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals) 1486#define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals) 1487#define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms) 1488#define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms) 1489#define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo) 1490#define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus) 1491#define elf_gp(bfd) (elf_tdata(bfd) -> gp) 1492#define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size) 1493#define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes) 1494#define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts) 1495#define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets) 1496#define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents) 1497#define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name) 1498#define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class) 1499#define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab) 1500#define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init) 1501#define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes) 1502#define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes) 1503#define elf_known_obj_attributes_proc(bfd) \ 1504 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1505#define elf_other_obj_attributes_proc(bfd) \ 1506 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1507 1508extern void _bfd_elf_swap_verdef_in 1509 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *); 1510extern void _bfd_elf_swap_verdef_out 1511 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *); 1512extern void _bfd_elf_swap_verdaux_in 1513 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *); 1514extern void _bfd_elf_swap_verdaux_out 1515 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *); 1516extern void _bfd_elf_swap_verneed_in 1517 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *); 1518extern void _bfd_elf_swap_verneed_out 1519 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *); 1520extern void _bfd_elf_swap_vernaux_in 1521 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *); 1522extern void _bfd_elf_swap_vernaux_out 1523 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *); 1524extern void _bfd_elf_swap_versym_in 1525 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *); 1526extern void _bfd_elf_swap_versym_out 1527 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *); 1528 1529extern int _bfd_elf_section_from_bfd_section 1530 (bfd *, asection *); 1531extern char *bfd_elf_string_from_elf_section 1532 (bfd *, unsigned, unsigned); 1533extern char *bfd_elf_get_str_section 1534 (bfd *, unsigned); 1535extern Elf_Internal_Sym *bfd_elf_get_elf_syms 1536 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *, 1537 Elf_External_Sym_Shndx *); 1538extern const char *bfd_elf_sym_name 1539 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *); 1540 1541extern bfd_boolean _bfd_elf_copy_private_bfd_data 1542 (bfd *, bfd *); 1543extern bfd_boolean _bfd_elf_print_private_bfd_data 1544 (bfd *, void *); 1545extern void bfd_elf_print_symbol 1546 (bfd *, void *, asymbol *, bfd_print_symbol_type); 1547 1548extern void _bfd_elf_sprintf_vma 1549 (bfd *, char *, bfd_vma); 1550extern void _bfd_elf_fprintf_vma 1551 (bfd *, void *, bfd_vma); 1552 1553extern unsigned int _bfd_elf_eh_frame_address_size 1554 (bfd *, asection *); 1555extern bfd_byte _bfd_elf_encode_eh_address 1556 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset, 1557 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded); 1558extern bfd_boolean _bfd_elf_can_make_relative 1559 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section); 1560 1561extern enum elf_reloc_type_class _bfd_elf_reloc_type_class 1562 (const Elf_Internal_Rela *); 1563extern bfd_vma _bfd_elf_rela_local_sym 1564 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *); 1565extern bfd_vma _bfd_elf_rel_local_sym 1566 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma); 1567extern bfd_vma _bfd_elf_section_offset 1568 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1569 1570extern unsigned long bfd_elf_hash 1571 (const char *); 1572extern unsigned long bfd_elf_gnu_hash 1573 (const char *); 1574 1575extern bfd_reloc_status_type bfd_elf_generic_reloc 1576 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 1577extern bfd_boolean bfd_elf_mkobject 1578 (bfd *); 1579extern bfd_boolean bfd_elf_mkcorefile 1580 (bfd *); 1581extern Elf_Internal_Shdr *bfd_elf_find_section 1582 (bfd *, char *); 1583extern bfd_boolean _bfd_elf_make_section_from_shdr 1584 (bfd *, Elf_Internal_Shdr *, const char *, int); 1585extern bfd_boolean _bfd_elf_make_section_from_phdr 1586 (bfd *, Elf_Internal_Phdr *, int, const char *); 1587extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc 1588 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 1589extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create 1590 (bfd *); 1591extern void _bfd_elf_link_hash_copy_indirect 1592 (struct bfd_link_info *, struct elf_link_hash_entry *, 1593 struct elf_link_hash_entry *); 1594extern void _bfd_elf_link_hash_hide_symbol 1595 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1596extern bfd_boolean _bfd_elf_link_hash_fixup_symbol 1597 (struct bfd_link_info *, struct elf_link_hash_entry *); 1598extern bfd_boolean _bfd_elf_link_hash_table_init 1599 (struct elf_link_hash_table *, bfd *, 1600 struct bfd_hash_entry *(*) 1601 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *), 1602 unsigned int); 1603extern bfd_boolean _bfd_elf_slurp_version_tables 1604 (bfd *, bfd_boolean); 1605extern bfd_boolean _bfd_elf_merge_sections 1606 (bfd *, struct bfd_link_info *); 1607extern bfd_boolean _bfd_elf_match_sections_by_type 1608 (bfd *, const asection *, bfd *, const asection *); 1609extern bfd_boolean bfd_elf_is_group_section 1610 (bfd *, const struct bfd_section *); 1611extern void _bfd_elf_section_already_linked 1612 (bfd *, struct bfd_section *, struct bfd_link_info *); 1613extern void bfd_elf_set_group_contents 1614 (bfd *, asection *, void *); 1615extern asection *_bfd_elf_check_kept_section 1616 (asection *, struct bfd_link_info *); 1617extern void _bfd_elf_link_just_syms 1618 (asection *, struct bfd_link_info *); 1619extern bfd_boolean _bfd_elf_copy_private_header_data 1620 (bfd *, bfd *); 1621extern bfd_boolean _bfd_elf_copy_private_symbol_data 1622 (bfd *, asymbol *, bfd *, asymbol *); 1623#define _bfd_generic_init_private_section_data \ 1624 _bfd_elf_init_private_section_data 1625extern bfd_boolean _bfd_elf_init_private_section_data 1626 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *); 1627extern bfd_boolean _bfd_elf_copy_private_section_data 1628 (bfd *, asection *, bfd *, asection *); 1629extern bfd_boolean _bfd_elf_write_object_contents 1630 (bfd *); 1631extern bfd_boolean _bfd_elf_write_corefile_contents 1632 (bfd *); 1633extern bfd_boolean _bfd_elf_set_section_contents 1634 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type); 1635extern long _bfd_elf_get_symtab_upper_bound 1636 (bfd *); 1637extern long _bfd_elf_canonicalize_symtab 1638 (bfd *, asymbol **); 1639extern long _bfd_elf_get_dynamic_symtab_upper_bound 1640 (bfd *); 1641extern long _bfd_elf_canonicalize_dynamic_symtab 1642 (bfd *, asymbol **); 1643extern long _bfd_elf_get_synthetic_symtab 1644 (bfd *, long, asymbol **, long, asymbol **, asymbol **); 1645extern long _bfd_elf_get_reloc_upper_bound 1646 (bfd *, sec_ptr); 1647extern long _bfd_elf_canonicalize_reloc 1648 (bfd *, sec_ptr, arelent **, asymbol **); 1649extern long _bfd_elf_get_dynamic_reloc_upper_bound 1650 (bfd *); 1651extern long _bfd_elf_canonicalize_dynamic_reloc 1652 (bfd *, arelent **, asymbol **); 1653extern asymbol *_bfd_elf_make_empty_symbol 1654 (bfd *); 1655extern void _bfd_elf_get_symbol_info 1656 (bfd *, asymbol *, symbol_info *); 1657extern bfd_boolean _bfd_elf_is_local_label_name 1658 (bfd *, const char *); 1659extern alent *_bfd_elf_get_lineno 1660 (bfd *, asymbol *); 1661extern bfd_boolean _bfd_elf_set_arch_mach 1662 (bfd *, enum bfd_architecture, unsigned long); 1663extern bfd_boolean _bfd_elf_find_nearest_line 1664 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **, 1665 unsigned int *); 1666extern bfd_boolean _bfd_elf_find_line 1667 (bfd *, asymbol **, asymbol *, const char **, unsigned int *); 1668#define _bfd_generic_find_line _bfd_elf_find_line 1669extern bfd_boolean _bfd_elf_find_inliner_info 1670 (bfd *, const char **, const char **, unsigned int *); 1671#define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols 1672#define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 1673extern int _bfd_elf_sizeof_headers 1674 (bfd *, struct bfd_link_info *); 1675extern bfd_boolean _bfd_elf_new_section_hook 1676 (bfd *, asection *); 1677extern bfd_boolean _bfd_elf_init_reloc_shdr 1678 (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean); 1679extern const struct bfd_elf_special_section *_bfd_elf_get_special_section 1680 (const char *, const struct bfd_elf_special_section *, unsigned int); 1681extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr 1682 (bfd *, asection *); 1683 1684/* If the target doesn't have reloc handling written yet: */ 1685extern void _bfd_elf_no_info_to_howto 1686 (bfd *, arelent *, Elf_Internal_Rela *); 1687 1688extern bfd_boolean bfd_section_from_shdr 1689 (bfd *, unsigned int shindex); 1690extern bfd_boolean bfd_section_from_phdr 1691 (bfd *, Elf_Internal_Phdr *, int); 1692 1693extern int _bfd_elf_symbol_from_bfd_symbol 1694 (bfd *, asymbol **); 1695 1696extern asection *bfd_section_from_r_symndx 1697 (bfd *, struct sym_sec_cache *, asection *, unsigned long); 1698extern asection *bfd_section_from_elf_index 1699 (bfd *, unsigned int); 1700extern struct bfd_strtab_hash *_bfd_elf_stringtab_init 1701 (void); 1702 1703extern struct elf_strtab_hash * _bfd_elf_strtab_init 1704 (void); 1705extern void _bfd_elf_strtab_free 1706 (struct elf_strtab_hash *); 1707extern bfd_size_type _bfd_elf_strtab_add 1708 (struct elf_strtab_hash *, const char *, bfd_boolean); 1709extern void _bfd_elf_strtab_addref 1710 (struct elf_strtab_hash *, bfd_size_type); 1711extern void _bfd_elf_strtab_delref 1712 (struct elf_strtab_hash *, bfd_size_type); 1713extern void _bfd_elf_strtab_clear_all_refs 1714 (struct elf_strtab_hash *); 1715extern bfd_size_type _bfd_elf_strtab_size 1716 (struct elf_strtab_hash *); 1717extern bfd_size_type _bfd_elf_strtab_offset 1718 (struct elf_strtab_hash *, bfd_size_type); 1719extern bfd_boolean _bfd_elf_strtab_emit 1720 (bfd *, struct elf_strtab_hash *); 1721extern void _bfd_elf_strtab_finalize 1722 (struct elf_strtab_hash *); 1723 1724extern bfd_boolean _bfd_elf_discard_section_eh_frame 1725 (bfd *, struct bfd_link_info *, asection *, 1726 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *); 1727extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr 1728 (bfd *, struct bfd_link_info *); 1729extern bfd_vma _bfd_elf_eh_frame_section_offset 1730 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1731extern bfd_boolean _bfd_elf_write_section_eh_frame 1732 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 1733extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr 1734 (bfd *, struct bfd_link_info *); 1735extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr 1736 (struct bfd_link_info *); 1737 1738extern bfd_boolean _bfd_elf_merge_symbol 1739 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *, 1740 asection **, bfd_vma *, unsigned int *, 1741 struct elf_link_hash_entry **, bfd_boolean *, 1742 bfd_boolean *, bfd_boolean *, bfd_boolean *); 1743 1744extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *); 1745 1746extern bfd_boolean _bfd_elf_add_default_symbol 1747 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, 1748 const char *, Elf_Internal_Sym *, asection **, bfd_vma *, 1749 bfd_boolean *, bfd_boolean); 1750 1751extern bfd_boolean _bfd_elf_export_symbol 1752 (struct elf_link_hash_entry *, void *); 1753 1754extern bfd_boolean _bfd_elf_link_find_version_dependencies 1755 (struct elf_link_hash_entry *, void *); 1756 1757extern bfd_boolean _bfd_elf_link_assign_sym_version 1758 (struct elf_link_hash_entry *, void *); 1759 1760extern long _bfd_elf_link_lookup_local_dynindx 1761 (struct bfd_link_info *, bfd *, long); 1762extern bfd_boolean _bfd_elf_compute_section_file_positions 1763 (bfd *, struct bfd_link_info *); 1764extern void _bfd_elf_assign_file_positions_for_relocs 1765 (bfd *); 1766extern file_ptr _bfd_elf_assign_file_position_for_section 1767 (Elf_Internal_Shdr *, file_ptr, bfd_boolean); 1768 1769extern bfd_boolean _bfd_elf_validate_reloc 1770 (bfd *, arelent *); 1771 1772extern bfd_boolean _bfd_elf_link_create_dynamic_sections 1773 (bfd *, struct bfd_link_info *); 1774extern bfd_boolean _bfd_elf_link_omit_section_dynsym 1775 (bfd *, struct bfd_link_info *, asection *); 1776extern bfd_boolean _bfd_elf_create_dynamic_sections 1777 (bfd *, struct bfd_link_info *); 1778extern bfd_boolean _bfd_elf_create_got_section 1779 (bfd *, struct bfd_link_info *); 1780extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym 1781 (bfd *, struct bfd_link_info *, asection *, const char *); 1782extern void _bfd_elf_init_1_index_section 1783 (bfd *, struct bfd_link_info *); 1784extern void _bfd_elf_init_2_index_sections 1785 (bfd *, struct bfd_link_info *); 1786 1787extern bfd_boolean _bfd_elfcore_make_pseudosection 1788 (bfd *, char *, size_t, ufile_ptr); 1789extern char *_bfd_elfcore_strndup 1790 (bfd *, char *, size_t); 1791 1792extern Elf_Internal_Rela *_bfd_elf_link_read_relocs 1793 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean); 1794 1795extern bfd_boolean _bfd_elf_link_size_reloc_section 1796 (bfd *, Elf_Internal_Shdr *, asection *); 1797 1798extern bfd_boolean _bfd_elf_link_output_relocs 1799 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 1800 struct elf_link_hash_entry **); 1801 1802extern bfd_boolean _bfd_elf_fix_symbol_flags 1803 (struct elf_link_hash_entry *, struct elf_info_failed *); 1804 1805extern bfd_boolean _bfd_elf_adjust_dynamic_symbol 1806 (struct elf_link_hash_entry *, void *); 1807 1808extern bfd_boolean _bfd_elf_adjust_dynamic_copy 1809 (struct elf_link_hash_entry *, asection *); 1810 1811extern bfd_boolean _bfd_elf_link_sec_merge_syms 1812 (struct elf_link_hash_entry *, void *); 1813 1814extern bfd_boolean _bfd_elf_dynamic_symbol_p 1815 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 1816 1817extern bfd_boolean _bfd_elf_symbol_refs_local_p 1818 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 1819 1820extern bfd_boolean bfd_elf_match_symbols_in_sections 1821 (asection *, asection *, struct bfd_link_info *); 1822 1823extern void bfd_elf_perform_complex_relocation 1824 (bfd * output_bfd ATTRIBUTE_UNUSED, 1825 struct bfd_link_info * info, 1826 bfd * input_bfd, 1827 asection * input_section, 1828 bfd_byte * contents, 1829 Elf_Internal_Rela * rel, 1830 Elf_Internal_Sym * local_syms, 1831 asection ** local_sections); 1832 1833extern bfd_boolean _bfd_elf_setup_sections 1834 (bfd *); 1835 1836extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *); 1837 1838extern const bfd_target *bfd_elf32_object_p 1839 (bfd *); 1840extern const bfd_target *bfd_elf32_core_file_p 1841 (bfd *); 1842extern char *bfd_elf32_core_file_failing_command 1843 (bfd *); 1844extern int bfd_elf32_core_file_failing_signal 1845 (bfd *); 1846extern bfd_boolean bfd_elf32_core_file_matches_executable_p 1847 (bfd *, bfd *); 1848 1849extern bfd_boolean bfd_elf32_swap_symbol_in 1850 (bfd *, const void *, const void *, Elf_Internal_Sym *); 1851extern void bfd_elf32_swap_symbol_out 1852 (bfd *, const Elf_Internal_Sym *, void *, void *); 1853extern void bfd_elf32_swap_reloc_in 1854 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 1855extern void bfd_elf32_swap_reloc_out 1856 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 1857extern void bfd_elf32_swap_reloca_in 1858 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 1859extern void bfd_elf32_swap_reloca_out 1860 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 1861extern void bfd_elf32_swap_phdr_in 1862 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *); 1863extern void bfd_elf32_swap_phdr_out 1864 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *); 1865extern void bfd_elf32_swap_dyn_in 1866 (bfd *, const void *, Elf_Internal_Dyn *); 1867extern void bfd_elf32_swap_dyn_out 1868 (bfd *, const Elf_Internal_Dyn *, void *); 1869extern long bfd_elf32_slurp_symbol_table 1870 (bfd *, asymbol **, bfd_boolean); 1871extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr 1872 (bfd *); 1873extern int bfd_elf32_write_out_phdrs 1874 (bfd *, const Elf_Internal_Phdr *, unsigned int); 1875extern void bfd_elf32_write_relocs 1876 (bfd *, asection *, void *); 1877extern bfd_boolean bfd_elf32_slurp_reloc_table 1878 (bfd *, asection *, asymbol **, bfd_boolean); 1879 1880extern const bfd_target *bfd_elf64_object_p 1881 (bfd *); 1882extern const bfd_target *bfd_elf64_core_file_p 1883 (bfd *); 1884extern char *bfd_elf64_core_file_failing_command 1885 (bfd *); 1886extern int bfd_elf64_core_file_failing_signal 1887 (bfd *); 1888extern bfd_boolean bfd_elf64_core_file_matches_executable_p 1889 (bfd *, bfd *); 1890 1891extern bfd_boolean bfd_elf64_swap_symbol_in 1892 (bfd *, const void *, const void *, Elf_Internal_Sym *); 1893extern void bfd_elf64_swap_symbol_out 1894 (bfd *, const Elf_Internal_Sym *, void *, void *); 1895extern void bfd_elf64_swap_reloc_in 1896 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 1897extern void bfd_elf64_swap_reloc_out 1898 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 1899extern void bfd_elf64_swap_reloca_in 1900 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 1901extern void bfd_elf64_swap_reloca_out 1902 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 1903extern void bfd_elf64_swap_phdr_in 1904 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *); 1905extern void bfd_elf64_swap_phdr_out 1906 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *); 1907extern void bfd_elf64_swap_dyn_in 1908 (bfd *, const void *, Elf_Internal_Dyn *); 1909extern void bfd_elf64_swap_dyn_out 1910 (bfd *, const Elf_Internal_Dyn *, void *); 1911extern long bfd_elf64_slurp_symbol_table 1912 (bfd *, asymbol **, bfd_boolean); 1913extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr 1914 (bfd *); 1915extern int bfd_elf64_write_out_phdrs 1916 (bfd *, const Elf_Internal_Phdr *, unsigned int); 1917extern void bfd_elf64_write_relocs 1918 (bfd *, asection *, void *); 1919extern bfd_boolean bfd_elf64_slurp_reloc_table 1920 (bfd *, asection *, asymbol **, bfd_boolean); 1921 1922extern bfd_boolean _bfd_elf_default_relocs_compatible 1923 (const bfd_target *, const bfd_target *); 1924 1925extern bfd_boolean _bfd_elf_relocs_compatible 1926 (const bfd_target *, const bfd_target *); 1927 1928extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup 1929 (bfd *, struct bfd_link_info *, const char *); 1930extern bfd_boolean bfd_elf_link_add_symbols 1931 (bfd *, struct bfd_link_info *); 1932extern bfd_boolean _bfd_elf_add_dynamic_entry 1933 (struct bfd_link_info *, bfd_vma, bfd_vma); 1934 1935extern bfd_boolean bfd_elf_link_record_dynamic_symbol 1936 (struct bfd_link_info *, struct elf_link_hash_entry *); 1937 1938extern int bfd_elf_link_record_local_dynamic_symbol 1939 (struct bfd_link_info *, bfd *, long); 1940 1941extern void bfd_elf_link_mark_dynamic_symbol 1942 (struct bfd_link_info *, struct elf_link_hash_entry *, 1943 Elf_Internal_Sym *); 1944 1945extern bfd_boolean _bfd_elf_close_and_cleanup 1946 (bfd *); 1947 1948extern bfd_boolean _bfd_elf_common_definition 1949 (Elf_Internal_Sym *); 1950 1951extern unsigned int _bfd_elf_common_section_index 1952 (asection *); 1953 1954extern asection *_bfd_elf_common_section 1955 (asection *); 1956 1957extern void _bfd_dwarf2_cleanup_debug_info 1958 (bfd *); 1959 1960extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn 1961 (bfd *, arelent *, struct bfd_symbol *, void *, 1962 asection *, bfd *, char **); 1963 1964extern bfd_boolean bfd_elf_final_link 1965 (bfd *, struct bfd_link_info *); 1966 1967extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol 1968 (struct elf_link_hash_entry *h, void *inf); 1969 1970extern bfd_boolean bfd_elf_gc_sections 1971 (bfd *, struct bfd_link_info *); 1972 1973extern bfd_boolean bfd_elf_gc_record_vtinherit 1974 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 1975 1976extern bfd_boolean bfd_elf_gc_record_vtentry 1977 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 1978 1979extern asection *_bfd_elf_gc_mark_hook 1980 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 1981 struct elf_link_hash_entry *, Elf_Internal_Sym *); 1982 1983extern bfd_boolean _bfd_elf_gc_mark 1984 (struct bfd_link_info *, asection *, 1985 asection * (*) (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 1986 struct elf_link_hash_entry *, Elf_Internal_Sym *)); 1987 1988extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets 1989 (bfd *, struct bfd_link_info *); 1990 1991extern bfd_boolean bfd_elf_gc_common_final_link 1992 (bfd *, struct bfd_link_info *); 1993 1994extern bfd_boolean bfd_elf_reloc_symbol_deleted_p 1995 (bfd_vma, void *); 1996 1997extern struct elf_segment_map * _bfd_elf_make_dynamic_segment 1998 (bfd *, asection *); 1999 2000extern bfd_boolean _bfd_elf_map_sections_to_segments 2001 (bfd *, struct bfd_link_info *); 2002 2003extern bfd_boolean _bfd_elf_is_function_type (unsigned int); 2004 2005/* Exported interface for writing elf corefile notes. */ 2006extern char *elfcore_write_note 2007 (bfd *, char *, int *, const char *, int, const void *, int); 2008extern char *elfcore_write_prpsinfo 2009 (bfd *, char *, int *, const char *, const char *); 2010extern char *elfcore_write_prstatus 2011 (bfd *, char *, int *, long, int, const void *); 2012extern char * elfcore_write_pstatus 2013 (bfd *, char *, int *, long, int, const void *); 2014extern char *elfcore_write_prfpreg 2015 (bfd *, char *, int *, const void *, int); 2016extern char *elfcore_write_thrmisc 2017 (bfd *, char *, int *, const char *, int); 2018extern char *elfcore_write_prxfpreg 2019 (bfd *, char *, int *, const void *, int); 2020extern char *elfcore_write_lwpstatus 2021 (bfd *, char *, int *, long, int, const void *); 2022 2023extern bfd *_bfd_elf32_bfd_from_remote_memory 2024 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep, 2025 int (*target_read_memory) (bfd_vma, bfd_byte *, int)); 2026extern bfd *_bfd_elf64_bfd_from_remote_memory 2027 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep, 2028 int (*target_read_memory) (bfd_vma, bfd_byte *, int)); 2029 2030extern bfd_vma bfd_elf_obj_attr_size (bfd *); 2031extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma); 2032extern int bfd_elf_get_obj_attr_int (bfd *, int, int); 2033extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int); 2034#define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \ 2035 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2036extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *); 2037#define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \ 2038 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2039extern void bfd_elf_add_obj_attr_compat (bfd *, int, unsigned int, 2040 const char *); 2041#define bfd_elf_add_proc_attr_compat(BFD, INTVAL, STRVAL) \ 2042 bfd_elf_add_obj_attr_compat ((BFD), OBJ_ATTR_PROC, (INTVAL), (STRVAL)) 2043 2044extern char *_bfd_elf_attr_strdup (bfd *, const char *); 2045extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *); 2046extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int); 2047extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *); 2048extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *); 2049 2050/* Large common section. */ 2051extern asection _bfd_elf_large_com_section; 2052 2053/* SH ELF specific routine. */ 2054 2055extern bfd_boolean _sh_elf_set_mach_from_flags 2056 (bfd *); 2057 2058/* This is the condition under which finish_dynamic_symbol will be called. 2059 If our finish_dynamic_symbol isn't called, we'll need to do something 2060 about initializing any .plt and .got entries in relocate_section. */ 2061#define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \ 2062 ((DYN) \ 2063 && ((SHARED) || !(H)->forced_local) \ 2064 && ((H)->dynindx != -1 || (H)->forced_local)) 2065 2066/* This macro is to avoid lots of duplicated code in the body 2067 of xxx_relocate_section() in the various elfxx-xxxx.c files. */ 2068#define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \ 2069 r_symndx, symtab_hdr, sym_hashes, \ 2070 h, sec, relocation, \ 2071 unresolved_reloc, warned) \ 2072 do \ 2073 { \ 2074 /* It seems this can happen with erroneous or unsupported \ 2075 input (mixing a.out and elf in an archive, for example.) */ \ 2076 if (sym_hashes == NULL) \ 2077 return FALSE; \ 2078 \ 2079 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \ 2080 \ 2081 while (h->root.type == bfd_link_hash_indirect \ 2082 || h->root.type == bfd_link_hash_warning) \ 2083 h = (struct elf_link_hash_entry *) h->root.u.i.link; \ 2084 \ 2085 warned = FALSE; \ 2086 unresolved_reloc = FALSE; \ 2087 relocation = 0; \ 2088 if (h->root.type == bfd_link_hash_defined \ 2089 || h->root.type == bfd_link_hash_defweak) \ 2090 { \ 2091 sec = h->root.u.def.section; \ 2092 if (sec == NULL \ 2093 || sec->output_section == NULL) \ 2094 /* Set a flag that will be cleared later if we find a \ 2095 relocation value for this symbol. output_section \ 2096 is typically NULL for symbols satisfied by a shared \ 2097 library. */ \ 2098 unresolved_reloc = TRUE; \ 2099 else \ 2100 relocation = (h->root.u.def.value \ 2101 + sec->output_section->vma \ 2102 + sec->output_offset); \ 2103 } \ 2104 else if (h->root.type == bfd_link_hash_undefweak) \ 2105 ; \ 2106 else if (info->unresolved_syms_in_objects == RM_IGNORE \ 2107 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \ 2108 ; \ 2109 else if (!info->relocatable) \ 2110 { \ 2111 bfd_boolean err; \ 2112 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \ 2113 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \ 2114 if (!info->callbacks->undefined_symbol (info, \ 2115 h->root.root.string, \ 2116 input_bfd, \ 2117 input_section, \ 2118 rel->r_offset, err)) \ 2119 return FALSE; \ 2120 warned = TRUE; \ 2121 } \ 2122 } \ 2123 while (0) 2124 2125/* Will a symbol be bound to the the definition within the shared 2126 library, if any. */ 2127#define SYMBOLIC_BIND(INFO, H) \ 2128 ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)) 2129 2130#endif /* _LIBELF_H_ */ 2131