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 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 57 typedef 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 79 struct elf_strtab_hash; 80 struct got_entry; 81 struct plt_entry; 82 83 /* ELF linker hash table entries. */ 84 85 struct 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 marked during garbage collection. */ 159 unsigned int mark : 1; 160 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is 161 not currently set by all the backends. */ 162 unsigned int non_got_ref : 1; 163 /* Symbol has a definition in a shared object. 164 FIXME: There is no real need for this field if def_dynamic is never 165 cleared and all places that test def_dynamic also test def_regular. */ 166 unsigned int dynamic_def : 1; 167 /* Symbol is weak in all shared objects. */ 168 unsigned int dynamic_weak : 1; 169 /* Symbol is referenced with a relocation where C/C++ pointer equality 170 matters. */ 171 unsigned int pointer_equality_needed : 1; 172 173 /* String table index in .dynstr if this is a dynamic symbol. */ 174 unsigned long dynstr_index; 175 176 union 177 { 178 /* If this is a weak defined symbol from a dynamic object, this 179 field points to a defined symbol with the same value, if there is 180 one. Otherwise it is NULL. */ 181 struct elf_link_hash_entry *weakdef; 182 183 /* Hash value of the name computed using the ELF hash function. 184 Used part way through size_dynamic_sections, after we've finished 185 with weakdefs. */ 186 unsigned long elf_hash_value; 187 } u; 188 189 /* Version information. */ 190 union 191 { 192 /* This field is used for a symbol which is not defined in a 193 regular object. It points to the version information read in 194 from the dynamic object. */ 195 Elf_Internal_Verdef *verdef; 196 /* This field is used for a symbol which is defined in a regular 197 object. It is set up in size_dynamic_sections. It points to 198 the version information we should write out for this symbol. */ 199 struct bfd_elf_version_tree *vertree; 200 } verinfo; 201 202 struct 203 { 204 /* Virtual table entry use information. This array is nominally of size 205 size/sizeof(target_void_pointer), though we have to be able to assume 206 and track a size while the symbol is still undefined. It is indexed 207 via offset/sizeof(target_void_pointer). */ 208 size_t size; 209 bfd_boolean *used; 210 211 /* Virtual table derivation info. */ 212 struct elf_link_hash_entry *parent; 213 } *vtable; 214 }; 215 216 /* Will references to this symbol always reference the symbol 217 in this object? STV_PROTECTED is excluded from the visibility test 218 here so that function pointer comparisons work properly. Since 219 function symbols not defined in an app are set to their .plt entry, 220 it's necessary for shared libs to also reference the .plt even 221 though the symbol is really local to the shared lib. */ 222 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \ 223 _bfd_elf_symbol_refs_local_p (H, INFO, 0) 224 225 /* Will _calls_ to this symbol always call the version in this object? */ 226 #define SYMBOL_CALLS_LOCAL(INFO, H) \ 227 _bfd_elf_symbol_refs_local_p (H, INFO, 1) 228 229 /* Common symbols that are turned into definitions don't have the 230 DEF_REGULAR flag set, so they might appear to be undefined. */ 231 #define ELF_COMMON_DEF_P(H) \ 232 (!(H)->def_regular \ 233 && !(H)->def_dynamic \ 234 && (H)->root.type == bfd_link_hash_defined) 235 236 /* Records local symbols to be emitted in the dynamic symbol table. */ 237 238 struct elf_link_local_dynamic_entry 239 { 240 struct elf_link_local_dynamic_entry *next; 241 242 /* The input bfd this symbol came from. */ 243 bfd *input_bfd; 244 245 /* The index of the local symbol being copied. */ 246 long input_indx; 247 248 /* The index in the outgoing dynamic symbol table. */ 249 long dynindx; 250 251 /* A copy of the input symbol. */ 252 Elf_Internal_Sym isym; 253 }; 254 255 struct elf_link_loaded_list 256 { 257 struct elf_link_loaded_list *next; 258 bfd *abfd; 259 }; 260 261 /* Structures used by the eh_frame optimization code. */ 262 struct cie_header 263 { 264 unsigned int length; 265 unsigned int id; 266 }; 267 268 struct cie 269 { 270 struct cie_header hdr; 271 unsigned char version; 272 char augmentation[20]; 273 bfd_vma code_align; 274 bfd_signed_vma data_align; 275 bfd_vma ra_column; 276 bfd_vma augmentation_size; 277 struct elf_link_hash_entry *personality; 278 unsigned char per_encoding; 279 unsigned char lsda_encoding; 280 unsigned char fde_encoding; 281 unsigned char initial_insn_length; 282 unsigned char make_relative; 283 unsigned char make_lsda_relative; 284 unsigned char initial_instructions[50]; 285 }; 286 287 struct eh_cie_fde 288 { 289 /* For FDEs, this points to the CIE used. */ 290 struct eh_cie_fde *cie_inf; 291 unsigned int size; 292 unsigned int offset; 293 unsigned int new_offset; 294 unsigned char fde_encoding; 295 unsigned char lsda_encoding; 296 unsigned char lsda_offset; 297 unsigned int cie : 1; 298 unsigned int removed : 1; 299 unsigned int add_augmentation_size : 1; 300 unsigned int add_fde_encoding : 1; 301 unsigned int make_relative : 1; 302 unsigned int make_lsda_relative : 1; 303 unsigned int need_lsda_relative : 1; 304 unsigned int per_encoding_relative : 1; 305 }; 306 307 struct eh_frame_sec_info 308 { 309 unsigned int count; 310 unsigned int alloced; 311 struct eh_cie_fde entry[1]; 312 }; 313 314 struct eh_frame_array_ent 315 { 316 bfd_vma initial_loc; 317 bfd_vma fde; 318 }; 319 320 struct eh_frame_hdr_info 321 { 322 struct cie last_cie; 323 asection *last_cie_sec; 324 struct eh_cie_fde *last_cie_inf; 325 asection *hdr_sec; 326 unsigned int fde_count, array_count; 327 struct eh_frame_array_ent *array; 328 /* TRUE if .eh_frame_hdr should contain the sorted search table. 329 We build it if we successfully read all .eh_frame input sections 330 and recognize them. */ 331 bfd_boolean table; 332 bfd_boolean offsets_adjusted; 333 }; 334 335 /* ELF linker hash table. */ 336 337 struct elf_link_hash_table 338 { 339 struct bfd_link_hash_table root; 340 341 /* Whether we have created the special dynamic sections required 342 when linking against or generating a shared object. */ 343 bfd_boolean dynamic_sections_created; 344 345 /* The BFD used to hold special sections created by the linker. 346 This will be the first BFD found which requires these sections to 347 be created. */ 348 bfd *dynobj; 349 350 /* The value to use when initialising got.refcount/offset and 351 plt.refcount/offset in an elf_link_hash_entry. Set to zero when 352 the values are refcounts. Set to init_got_offset/init_plt_offset 353 in size_dynamic_sections when the values may be offsets. */ 354 union gotplt_union init_got_refcount; 355 union gotplt_union init_plt_refcount; 356 357 /* The value to use for got.refcount/offset and plt.refcount/offset 358 when the values may be offsets. Normally (bfd_vma) -1. */ 359 union gotplt_union init_got_offset; 360 union gotplt_union init_plt_offset; 361 362 /* The number of symbols found in the link which must be put into 363 the .dynsym section. */ 364 bfd_size_type dynsymcount; 365 366 /* The string table of dynamic symbols, which becomes the .dynstr 367 section. */ 368 struct elf_strtab_hash *dynstr; 369 370 /* The number of buckets in the hash table in the .hash section. 371 This is based on the number of dynamic symbols. */ 372 bfd_size_type bucketcount; 373 374 /* A linked list of DT_NEEDED names found in dynamic objects 375 included in the link. */ 376 struct bfd_link_needed_list *needed; 377 378 /* The _GLOBAL_OFFSET_TABLE_ symbol. */ 379 struct elf_link_hash_entry *hgot; 380 381 /* A pointer to information used to merge SEC_MERGE sections. */ 382 void *merge_info; 383 384 /* Used to link stabs in sections. */ 385 struct stab_info stab_info; 386 387 /* Used by eh_frame code when editing .eh_frame. */ 388 struct eh_frame_hdr_info eh_info; 389 390 /* A linked list of local symbols to be added to .dynsym. */ 391 struct elf_link_local_dynamic_entry *dynlocal; 392 393 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic 394 objects included in the link. */ 395 struct bfd_link_needed_list *runpath; 396 397 /* Cached first output tls section and size of PT_TLS segment. */ 398 asection *tls_sec; 399 bfd_size_type tls_size; 400 401 /* A linked list of BFD's loaded in the link. */ 402 struct elf_link_loaded_list *loaded; 403 404 /* True if this target has relocatable executables, so needs dynamic 405 section symbols. */ 406 bfd_boolean is_relocatable_executable; 407 }; 408 409 /* Look up an entry in an ELF linker hash table. */ 410 411 #define elf_link_hash_lookup(table, string, create, copy, follow) \ 412 ((struct elf_link_hash_entry *) \ 413 bfd_link_hash_lookup (&(table)->root, (string), (create), \ 414 (copy), (follow))) 415 416 /* Traverse an ELF linker hash table. */ 417 418 #define elf_link_hash_traverse(table, func, info) \ 419 (bfd_link_hash_traverse \ 420 (&(table)->root, \ 421 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ 422 (info))) 423 424 /* Get the ELF linker hash table from a link_info structure. */ 425 426 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash)) 427 428 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */ 429 #define is_elf_hash_table(htab) \ 430 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table) 431 432 /* Used by bfd_section_from_r_symndx to cache a small number of local 433 symbol to section mappings. */ 434 #define LOCAL_SYM_CACHE_SIZE 32 435 struct sym_sec_cache 436 { 437 bfd *abfd; 438 unsigned long indx[LOCAL_SYM_CACHE_SIZE]; 439 asection *sec[LOCAL_SYM_CACHE_SIZE]; 440 }; 441 442 /* Constant information held for an ELF backend. */ 443 444 struct elf_size_info { 445 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr; 446 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note; 447 448 /* The size of entries in the .hash section. */ 449 unsigned char sizeof_hash_entry; 450 451 /* The number of internal relocations to allocate per external 452 relocation entry. */ 453 unsigned char int_rels_per_ext_rel; 454 /* We use some fixed size arrays. This should be large enough to 455 handle all back-ends. */ 456 #define MAX_INT_RELS_PER_EXT_REL 3 457 458 unsigned char arch_size, log_file_align; 459 unsigned char elfclass, ev_current; 460 int (*write_out_phdrs) 461 (bfd *, const Elf_Internal_Phdr *, unsigned int); 462 bfd_boolean 463 (*write_shdrs_and_ehdr) (bfd *); 464 void (*write_relocs) 465 (bfd *, asection *, void *); 466 void (*swap_symbol_in) 467 (bfd *, const void *, const void *, Elf_Internal_Sym *); 468 void (*swap_symbol_out) 469 (bfd *, const Elf_Internal_Sym *, void *, void *); 470 bfd_boolean (*slurp_reloc_table) 471 (bfd *, asection *, asymbol **, bfd_boolean); 472 long (*slurp_symbol_table) 473 (bfd *, asymbol **, bfd_boolean); 474 void (*swap_dyn_in) 475 (bfd *, const void *, Elf_Internal_Dyn *); 476 void (*swap_dyn_out) 477 (bfd *, const Elf_Internal_Dyn *, void *); 478 479 /* This function is called to swap in a REL relocation. If an 480 external relocation corresponds to more than one internal 481 relocation, then all relocations are swapped in at once. */ 482 void (*swap_reloc_in) 483 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 484 485 /* This function is called to swap out a REL relocation. */ 486 void (*swap_reloc_out) 487 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 488 489 /* This function is called to swap in a RELA relocation. If an 490 external relocation corresponds to more than one internal 491 relocation, then all relocations are swapped in at once. */ 492 void (*swap_reloca_in) 493 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 494 495 /* This function is called to swap out a RELA relocation. */ 496 void (*swap_reloca_out) 497 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 498 }; 499 500 #define elf_symbol_from(ABFD,S) \ 501 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \ 502 && (S)->the_bfd->tdata.elf_obj_data != 0) \ 503 ? (elf_symbol_type *) (S) \ 504 : 0) 505 506 enum elf_reloc_type_class { 507 reloc_class_normal, 508 reloc_class_relative, 509 reloc_class_plt, 510 reloc_class_copy 511 }; 512 513 struct elf_reloc_cookie 514 { 515 Elf_Internal_Rela *rels, *rel, *relend; 516 Elf_Internal_Sym *locsyms; 517 bfd *abfd; 518 size_t locsymcount; 519 size_t extsymoff; 520 struct elf_link_hash_entry **sym_hashes; 521 int r_sym_shift; 522 bfd_boolean bad_symtab; 523 }; 524 525 /* The level of IRIX compatibility we're striving for. */ 526 527 typedef enum { 528 ict_none, 529 ict_irix5, 530 ict_irix6 531 } irix_compat_t; 532 533 /* Mapping of ELF section names and types. */ 534 struct bfd_elf_special_section 535 { 536 const char *prefix; 537 int prefix_length; 538 /* 0 means name must match PREFIX exactly. 539 -1 means name must start with PREFIX followed by an arbitrary string. 540 -2 means name must match PREFIX exactly or consist of PREFIX followed 541 by a dot then anything. 542 > 0 means name must start with the first PREFIX_LENGTH chars of 543 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */ 544 int suffix_length; 545 int type; 546 int attr; 547 }; 548 549 struct elf_backend_data 550 { 551 /* The architecture for this backend. */ 552 enum bfd_architecture arch; 553 554 /* The ELF machine code (EM_xxxx) for this backend. */ 555 int elf_machine_code; 556 557 /* The maximum page size for this backend. */ 558 bfd_vma maxpagesize; 559 560 /* The minimum page size for this backend. An input object will not be 561 considered page aligned unless its sections are correctly aligned for 562 pages at least this large. May be smaller than maxpagesize. */ 563 bfd_vma minpagesize; 564 565 /* The BFD flags applied to sections created for dynamic linking. */ 566 flagword dynamic_sec_flags; 567 568 /* A function to translate an ELF RELA relocation to a BFD arelent 569 structure. */ 570 void (*elf_info_to_howto) 571 (bfd *, arelent *, Elf_Internal_Rela *); 572 573 /* A function to translate an ELF REL relocation to a BFD arelent 574 structure. */ 575 void (*elf_info_to_howto_rel) 576 (bfd *, arelent *, Elf_Internal_Rela *); 577 578 /* A function to determine whether a symbol is global when 579 partitioning the symbol table into local and global symbols. 580 This should be NULL for most targets, in which case the correct 581 thing will be done. MIPS ELF, at least on the Irix 5, has 582 special requirements. */ 583 bfd_boolean (*elf_backend_sym_is_global) 584 (bfd *, asymbol *); 585 586 /* The remaining functions are hooks which are called only if they 587 are not NULL. */ 588 589 /* A function to permit a backend specific check on whether a 590 particular BFD format is relevant for an object file, and to 591 permit the backend to set any global information it wishes. When 592 this is called elf_elfheader is set, but anything else should be 593 used with caution. If this returns FALSE, the check_format 594 routine will return a bfd_error_wrong_format error. */ 595 bfd_boolean (*elf_backend_object_p) 596 (bfd *); 597 598 /* A function to do additional symbol processing when reading the 599 ELF symbol table. This is where any processor-specific special 600 section indices are handled. */ 601 void (*elf_backend_symbol_processing) 602 (bfd *, asymbol *); 603 604 /* A function to do additional symbol processing after reading the 605 entire ELF symbol table. */ 606 bfd_boolean (*elf_backend_symbol_table_processing) 607 (bfd *, elf_symbol_type *, unsigned int); 608 609 /* A function to set the type of the info field. Processor-specific 610 types should be handled here. */ 611 int (*elf_backend_get_symbol_type) 612 (Elf_Internal_Sym *, int); 613 614 /* A function to return the linker hash table entry of a symbol that 615 might be satisfied by an archive symbol. */ 616 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup) 617 (bfd *, struct bfd_link_info *, const char *); 618 619 /* Return true if local section symbols should have a non-null st_name. 620 NULL implies false. */ 621 bfd_boolean (*elf_backend_name_local_section_symbols) 622 (bfd *); 623 624 /* A function to do additional processing on the ELF section header 625 just before writing it out. This is used to set the flags and 626 type fields for some sections, or to actually write out data for 627 unusual sections. */ 628 bfd_boolean (*elf_backend_section_processing) 629 (bfd *, Elf_Internal_Shdr *); 630 631 /* A function to handle unusual section types when creating BFD 632 sections from ELF sections. */ 633 bfd_boolean (*elf_backend_section_from_shdr) 634 (bfd *, Elf_Internal_Shdr *, const char *, int); 635 636 /* A function to convert machine dependent ELF section header flags to 637 BFD internal section header flags. */ 638 bfd_boolean (*elf_backend_section_flags) 639 (flagword *, const Elf_Internal_Shdr *); 640 641 /* A function that returns a struct containing ELF section flags and 642 type for the given BFD section. */ 643 const struct bfd_elf_special_section * (*get_sec_type_attr) 644 (bfd *, asection *); 645 646 /* A function to handle unusual program segment types when creating BFD 647 sections from ELF program segments. */ 648 bfd_boolean (*elf_backend_section_from_phdr) 649 (bfd *, Elf_Internal_Phdr *, int, const char *); 650 651 /* A function to set up the ELF section header for a BFD section in 652 preparation for writing it out. This is where the flags and type 653 fields are set for unusual sections. */ 654 bfd_boolean (*elf_backend_fake_sections) 655 (bfd *, Elf_Internal_Shdr *, asection *); 656 657 /* A function to get the ELF section index for a BFD section. If 658 this returns TRUE, the section was found. If it is a normal ELF 659 section, *RETVAL should be left unchanged. If it is not a normal 660 ELF section *RETVAL should be set to the SHN_xxxx index. */ 661 bfd_boolean (*elf_backend_section_from_bfd_section) 662 (bfd *, asection *, int *retval); 663 664 /* If this field is not NULL, it is called by the add_symbols phase 665 of a link just before adding a symbol to the global linker hash 666 table. It may modify any of the fields as it wishes. If *NAME 667 is set to NULL, the symbol will be skipped rather than being 668 added to the hash table. This function is responsible for 669 handling all processor dependent symbol bindings and section 670 indices, and must set at least *FLAGS and *SEC for each processor 671 dependent case; failure to do so will cause a link error. */ 672 bfd_boolean (*elf_add_symbol_hook) 673 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *, 674 const char **name, flagword *flags, asection **sec, bfd_vma *value); 675 676 /* If this field is not NULL, it is called by the elf_link_output_sym 677 phase of a link for each symbol which will appear in the object file. */ 678 bfd_boolean (*elf_backend_link_output_symbol_hook) 679 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *, 680 asection *, struct elf_link_hash_entry *); 681 682 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend 683 linker the first time it encounters a dynamic object in the link. 684 This function must create any sections required for dynamic 685 linking. The ABFD argument is a dynamic object. The .interp, 686 .dynamic, .dynsym, .dynstr, and .hash functions have already been 687 created, and this function may modify the section flags if 688 desired. This function will normally create the .got and .plt 689 sections, but different backends have different requirements. */ 690 bfd_boolean (*elf_backend_create_dynamic_sections) 691 (bfd *abfd, struct bfd_link_info *info); 692 693 /* When creating a shared library, determine whether to omit the 694 dynamic symbol for the section. */ 695 bfd_boolean (*elf_backend_omit_section_dynsym) 696 (bfd *output_bfd, struct bfd_link_info *info, asection *osec); 697 698 /* The CHECK_RELOCS function is called by the add_symbols phase of 699 the ELF backend linker. It is called once for each section with 700 relocs of an object file, just after the symbols for the object 701 file have been added to the global linker hash table. The 702 function must look through the relocs and do any special handling 703 required. This generally means allocating space in the global 704 offset table, and perhaps allocating space for a reloc. The 705 relocs are always passed as Rela structures; if the section 706 actually uses Rel structures, the r_addend field will always be 707 zero. */ 708 bfd_boolean (*check_relocs) 709 (bfd *abfd, struct bfd_link_info *info, asection *o, 710 const Elf_Internal_Rela *relocs); 711 712 /* The CHECK_DIRECTIVES function is called once per input file by 713 the add_symbols phase of the ELF backend linker. The function 714 must inspect the bfd and create any additional symbols according 715 to any custom directives in the bfd. */ 716 bfd_boolean (*check_directives) 717 (bfd *abfd, struct bfd_link_info *info); 718 719 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend 720 linker for every symbol which is defined by a dynamic object and 721 referenced by a regular object. This is called after all the 722 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS 723 function has been called. The hash table entry should be 724 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be 725 defined in a section from a dynamic object. Dynamic object 726 sections are not included in the final link, and this function is 727 responsible for changing the value to something which the rest of 728 the link can deal with. This will normally involve adding an 729 entry to the .plt or .got or some such section, and setting the 730 symbol to point to that. */ 731 bfd_boolean (*elf_backend_adjust_dynamic_symbol) 732 (struct bfd_link_info *info, struct elf_link_hash_entry *h); 733 734 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker 735 after all the linker input files have been seen but before the 736 section sizes have been set. This is called after 737 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */ 738 bfd_boolean (*elf_backend_always_size_sections) 739 (bfd *output_bfd, struct bfd_link_info *info); 740 741 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend 742 linker after all the linker input files have been seen but before 743 the sections sizes have been set. This is called after 744 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols. 745 It is only called when linking against a dynamic object. It must 746 set the sizes of the dynamic sections, and may fill in their 747 contents as well. The generic ELF linker can handle the .dynsym, 748 .dynstr and .hash sections. This function must handle the 749 .interp section and any sections created by the 750 CREATE_DYNAMIC_SECTIONS entry point. */ 751 bfd_boolean (*elf_backend_size_dynamic_sections) 752 (bfd *output_bfd, struct bfd_link_info *info); 753 754 /* The RELOCATE_SECTION function is called by the ELF backend linker 755 to handle the relocations for a section. 756 757 The relocs are always passed as Rela structures; if the section 758 actually uses Rel structures, the r_addend field will always be 759 zero. 760 761 This function is responsible for adjust the section contents as 762 necessary, and (if using Rela relocs and generating a 763 relocatable output file) adjusting the reloc addend as 764 necessary. 765 766 This function does not have to worry about setting the reloc 767 address or the reloc symbol index. 768 769 LOCAL_SYMS is a pointer to the swapped in local symbols. 770 771 LOCAL_SECTIONS is an array giving the section in the input file 772 corresponding to the st_shndx field of each local symbol. 773 774 The global hash table entry for the global symbols can be found 775 via elf_sym_hashes (input_bfd). 776 777 When generating relocatable output, this function must handle 778 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 779 going to be the section symbol corresponding to the output 780 section, which means that the addend must be adjusted 781 accordingly. */ 782 bfd_boolean (*elf_backend_relocate_section) 783 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd, 784 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs, 785 Elf_Internal_Sym *local_syms, asection **local_sections); 786 787 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend 788 linker just before it writes a symbol out to the .dynsym section. 789 The processor backend may make any required adjustment to the 790 symbol. It may also take the opportunity to set contents of the 791 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on 792 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called 793 on those symbols which are defined by a dynamic object. */ 794 bfd_boolean (*elf_backend_finish_dynamic_symbol) 795 (bfd *output_bfd, struct bfd_link_info *info, 796 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym); 797 798 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend 799 linker just before it writes all the dynamic sections out to the 800 output file. The FINISH_DYNAMIC_SYMBOL will have been called on 801 all dynamic symbols. */ 802 bfd_boolean (*elf_backend_finish_dynamic_sections) 803 (bfd *output_bfd, struct bfd_link_info *info); 804 805 /* A function to do any beginning processing needed for the ELF file 806 before building the ELF headers and computing file positions. */ 807 void (*elf_backend_begin_write_processing) 808 (bfd *, struct bfd_link_info *); 809 810 /* A function to do any final processing needed for the ELF file 811 before writing it out. The LINKER argument is TRUE if this BFD 812 was created by the ELF backend linker. */ 813 void (*elf_backend_final_write_processing) 814 (bfd *, bfd_boolean linker); 815 816 /* This function is called by get_program_header_size. It should 817 return the number of additional program segments which this BFD 818 will need. It should return -1 on error. */ 819 int (*elf_backend_additional_program_headers) 820 (bfd *); 821 822 /* This function is called to modify an existing segment map in a 823 backend specific fashion. */ 824 bfd_boolean (*elf_backend_modify_segment_map) 825 (bfd *, struct bfd_link_info *); 826 827 /* This function is called during section gc to discover the section a 828 particular relocation refers to. */ 829 asection * (*gc_mark_hook) 830 (asection *sec, struct bfd_link_info *, Elf_Internal_Rela *, 831 struct elf_link_hash_entry *h, Elf_Internal_Sym *); 832 833 /* This function, if defined, is called during the sweep phase of gc 834 in order that a backend might update any data structures it might 835 be maintaining. */ 836 bfd_boolean (*gc_sweep_hook) 837 (bfd *abfd, struct bfd_link_info *info, asection *o, 838 const Elf_Internal_Rela *relocs); 839 840 /* This function, if defined, is called after the ELF headers have 841 been created. This allows for things like the OS and ABI versions 842 to be changed. */ 843 void (*elf_backend_post_process_headers) 844 (bfd *, struct bfd_link_info *); 845 846 /* This function, if defined, prints a symbol to file and returns the 847 name of the symbol to be printed. It should return NULL to fall 848 back to default symbol printing. */ 849 const char *(*elf_backend_print_symbol_all) 850 (bfd *, void *, asymbol *); 851 852 /* This function, if defined, is called after all local symbols and 853 global symbols converted to locals are emitted into the symtab 854 section. It allows the backend to emit special global symbols 855 not handled in the hash table. */ 856 bfd_boolean (*elf_backend_output_arch_syms) 857 (bfd *, struct bfd_link_info *, void *, 858 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 859 struct elf_link_hash_entry *)); 860 861 /* Copy any information related to dynamic linking from a pre-existing 862 symbol to a newly created symbol. Also called to copy flags and 863 other back-end info to a weakdef, in which case the symbol is not 864 newly created and plt/got refcounts and dynamic indices should not 865 be copied. */ 866 void (*elf_backend_copy_indirect_symbol) 867 (const struct elf_backend_data *, struct elf_link_hash_entry *, 868 struct elf_link_hash_entry *); 869 870 /* Modify any information related to dynamic linking such that the 871 symbol is not exported. */ 872 void (*elf_backend_hide_symbol) 873 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 874 875 /* Merge the backend specific symbol attribute. */ 876 void (*elf_backend_merge_symbol_attribute) 877 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean, 878 bfd_boolean); 879 880 /* Emit relocations. Overrides default routine for emitting relocs, 881 except during a relocatable link, or if all relocs are being emitted. */ 882 bfd_boolean (*elf_backend_emit_relocs) 883 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 884 struct elf_link_hash_entry **); 885 886 /* Count relocations. Not called for relocatable links 887 or if all relocs are being preserved in the output. */ 888 unsigned int (*elf_backend_count_relocs) 889 (asection *, Elf_Internal_Rela *); 890 891 /* This function, if defined, is called when an NT_PRSTATUS note is found 892 in a core file. */ 893 bfd_boolean (*elf_backend_grok_prstatus) 894 (bfd *, Elf_Internal_Note *); 895 896 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO 897 note is found in a core file. */ 898 bfd_boolean (*elf_backend_grok_psinfo) 899 (bfd *, Elf_Internal_Note *); 900 901 /* Functions to print VMAs. Special code to handle 64 bit ELF files. */ 902 void (* elf_backend_sprintf_vma) 903 (bfd *, char *, bfd_vma); 904 void (* elf_backend_fprintf_vma) 905 (bfd *, void *, bfd_vma); 906 907 /* This function returns class of a reloc type. */ 908 enum elf_reloc_type_class (*elf_backend_reloc_type_class) 909 (const Elf_Internal_Rela *); 910 911 /* This function, if defined, removes information about discarded functions 912 from other sections which mention them. */ 913 bfd_boolean (*elf_backend_discard_info) 914 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *); 915 916 /* This function, if defined, signals that the function above has removed 917 the discarded relocations for this section. */ 918 bfd_boolean (*elf_backend_ignore_discarded_relocs) 919 (asection *); 920 921 /* This function returns the width of FDE pointers in bytes, or 0 if 922 that can't be determined for some reason. The default definition 923 goes by the bfd's EI_CLASS. */ 924 unsigned int (*elf_backend_eh_frame_address_size) 925 (bfd *, asection *); 926 927 /* These functions tell elf-eh-frame whether to attempt to turn 928 absolute or lsda encodings into pc-relative ones. The default 929 definition enables these transformations. */ 930 bfd_boolean (*elf_backend_can_make_relative_eh_frame) 931 (bfd *, struct bfd_link_info *, asection *); 932 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame) 933 (bfd *, struct bfd_link_info *, asection *); 934 935 /* This function returns an encoding after computing the encoded 936 value (and storing it in ENCODED) for the given OFFSET into OSEC, 937 to be stored in at LOC_OFFSET into the LOC_SEC input section. 938 The default definition chooses a 32-bit PC-relative encoding. */ 939 bfd_byte (*elf_backend_encode_eh_address) 940 (bfd *abfd, struct bfd_link_info *info, 941 asection *osec, bfd_vma offset, 942 asection *loc_sec, bfd_vma loc_offset, 943 bfd_vma *encoded); 944 945 /* This function, if defined, may write out the given section. 946 Returns TRUE if it did so and FALSE if the caller should. */ 947 bfd_boolean (*elf_backend_write_section) 948 (bfd *, asection *, bfd_byte *); 949 950 /* The level of IRIX compatibility we're striving for. 951 MIPS ELF specific function. */ 952 irix_compat_t (*elf_backend_mips_irix_compat) 953 (bfd *); 954 955 reloc_howto_type *(*elf_backend_mips_rtype_to_howto) 956 (unsigned int, bfd_boolean); 957 958 /* The swapping table to use when dealing with ECOFF information. 959 Used for the MIPS ELF .mdebug section. */ 960 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap; 961 962 /* This function implements `bfd_elf_bfd_from_remote_memory'; 963 see elf.c, elfcode.h. */ 964 bfd *(*elf_backend_bfd_from_remote_memory) 965 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep, 966 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len)); 967 968 /* This function is used by `_bfd_elf_get_synthetic_symtab'; 969 see elf.c. */ 970 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *); 971 972 /* Used to handle bad SHF_LINK_ORDER input. */ 973 bfd_error_handler_type link_order_error_handler; 974 975 /* Name of the PLT relocation section. */ 976 const char *relplt_name; 977 978 /* Alternate EM_xxxx machine codes for this backend. */ 979 int elf_machine_alt1; 980 int elf_machine_alt2; 981 982 const struct elf_size_info *s; 983 984 /* The size in bytes of the header for the GOT. This includes the 985 so-called reserved entries on some systems. */ 986 bfd_vma got_header_size; 987 988 /* This is TRUE if the linker should act like collect and gather 989 global constructors and destructors by name. This is TRUE for 990 MIPS ELF because the Irix 5 tools can not handle the .init 991 section. */ 992 unsigned collect : 1; 993 994 /* This is TRUE if the linker should ignore changes to the type of a 995 symbol. This is TRUE for MIPS ELF because some Irix 5 objects 996 record undefined functions as STT_OBJECT although the definitions 997 are STT_FUNC. */ 998 unsigned type_change_ok : 1; 999 1000 /* Whether the backend may use REL relocations. (Some backends use 1001 both REL and RELA relocations, and this flag is set for those 1002 backends.) */ 1003 unsigned may_use_rel_p : 1; 1004 1005 /* Whether the backend may use RELA relocations. (Some backends use 1006 both REL and RELA relocations, and this flag is set for those 1007 backends.) */ 1008 unsigned may_use_rela_p : 1; 1009 1010 /* Whether the default relocation type is RELA. If a backend with 1011 this flag set wants REL relocations for a particular section, 1012 it must note that explicitly. Similarly, if this flag is clear, 1013 and the backend wants RELA relocations for a particular 1014 section. */ 1015 unsigned default_use_rela_p : 1; 1016 1017 /* Set if RELA relocations for a relocatable link can be handled by 1018 generic code. Backends that set this flag need do nothing in the 1019 backend relocate_section routine for relocatable linking. */ 1020 unsigned rela_normal : 1; 1021 1022 /* TRUE if addresses "naturally" sign extend. This is used when 1023 swapping in from Elf32 when BFD64. */ 1024 unsigned sign_extend_vma : 1; 1025 1026 unsigned want_got_plt : 1; 1027 unsigned plt_readonly : 1; 1028 unsigned want_plt_sym : 1; 1029 unsigned plt_not_loaded : 1; 1030 unsigned plt_alignment : 4; 1031 unsigned can_gc_sections : 1; 1032 unsigned can_refcount : 1; 1033 unsigned want_got_sym : 1; 1034 unsigned want_dynbss : 1; 1035 /* Targets which do not support physical addressing often require 1036 that the p_paddr field in the section header to be set to zero. 1037 This field indicates whether this behavior is required. */ 1038 unsigned want_p_paddr_set_to_zero : 1; 1039 }; 1040 1041 /* Information stored for each BFD section in an ELF file. This 1042 structure is allocated by elf_new_section_hook. */ 1043 1044 struct bfd_elf_section_data 1045 { 1046 /* The ELF header for this section. */ 1047 Elf_Internal_Shdr this_hdr; 1048 1049 /* The ELF header for the reloc section associated with this 1050 section, if any. */ 1051 Elf_Internal_Shdr rel_hdr; 1052 1053 /* If there is a second reloc section associated with this section, 1054 as can happen on Irix 6, this field points to the header. */ 1055 Elf_Internal_Shdr *rel_hdr2; 1056 1057 /* The number of relocations currently assigned to REL_HDR. */ 1058 unsigned int rel_count; 1059 1060 /* The number of relocations currently assigned to REL_HDR2. */ 1061 unsigned int rel_count2; 1062 1063 /* The ELF section number of this section. */ 1064 int this_idx; 1065 1066 /* The ELF section number of the reloc section indicated by 1067 REL_HDR if any. Only used for an output file. */ 1068 int rel_idx; 1069 1070 /* The ELF section number of the reloc section indicated by 1071 REL_HDR2 if any. Only used for an output file. */ 1072 int rel_idx2; 1073 1074 /* Used by the backend linker when generating a shared library to 1075 record the dynamic symbol index for a section symbol 1076 corresponding to this section. A value of 0 means that there is 1077 no dynamic symbol for this section. */ 1078 int dynindx; 1079 1080 /* A pointer to the linked-to section for SHF_LINK_ORDER. */ 1081 asection *linked_to; 1082 1083 /* Used by the backend linker to store the symbol hash table entries 1084 associated with relocs against global symbols. */ 1085 struct elf_link_hash_entry **rel_hashes; 1086 1087 /* A pointer to the swapped relocs. If the section uses REL relocs, 1088 rather than RELA, all the r_addend fields will be zero. This 1089 pointer may be NULL. It is used by the backend linker. */ 1090 Elf_Internal_Rela *relocs; 1091 1092 /* A pointer to a linked list tracking dynamic relocs copied for 1093 local symbols. */ 1094 void *local_dynrel; 1095 1096 /* A pointer to the bfd section used for dynamic relocs. */ 1097 asection *sreloc; 1098 1099 union { 1100 /* Group name, if this section is a member of a group. */ 1101 const char *name; 1102 1103 /* Group signature sym, if this is the SHT_GROUP section. */ 1104 struct bfd_symbol *id; 1105 } group; 1106 1107 /* Optional information about section group; NULL if it doesn't 1108 belongs to any section group. */ 1109 asection *sec_group; 1110 1111 /* A linked list of sections in the group. Circular when used by 1112 the linker. */ 1113 asection *next_in_group; 1114 1115 /* A pointer used for various section optimizations. */ 1116 void *sec_info; 1117 }; 1118 1119 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd) 1120 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to) 1121 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type) 1122 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags) 1123 #define elf_group_name(sec) (elf_section_data(sec)->group.name) 1124 #define elf_group_id(sec) (elf_section_data(sec)->group.id) 1125 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group) 1126 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group) 1127 1128 /* Return TRUE if section has been discarded. */ 1129 #define elf_discarded_section(sec) \ 1130 (!bfd_is_abs_section (sec) \ 1131 && bfd_is_abs_section ((sec)->output_section) \ 1132 && (sec)->sec_info_type != ELF_INFO_TYPE_MERGE \ 1133 && (sec)->sec_info_type != ELF_INFO_TYPE_JUST_SYMS) 1134 1135 #define get_elf_backend_data(abfd) \ 1136 ((const struct elf_backend_data *) (abfd)->xvec->backend_data) 1137 1138 /* This struct is used to pass information to routines called via 1139 elf_link_hash_traverse which must return failure. */ 1140 1141 struct elf_info_failed 1142 { 1143 bfd_boolean failed; 1144 struct bfd_link_info *info; 1145 struct bfd_elf_version_tree *verdefs; 1146 }; 1147 1148 /* This structure is used to pass information to 1149 _bfd_elf_link_assign_sym_version. */ 1150 1151 struct elf_assign_sym_version_info 1152 { 1153 /* Output BFD. */ 1154 bfd *output_bfd; 1155 /* General link information. */ 1156 struct bfd_link_info *info; 1157 /* Version tree. */ 1158 struct bfd_elf_version_tree *verdefs; 1159 /* Whether we had a failure. */ 1160 bfd_boolean failed; 1161 }; 1162 1163 /* This structure is used to pass information to 1164 _bfd_elf_link_find_version_dependencies. */ 1165 1166 struct elf_find_verdep_info 1167 { 1168 /* Output BFD. */ 1169 bfd *output_bfd; 1170 /* General link information. */ 1171 struct bfd_link_info *info; 1172 /* The number of dependencies. */ 1173 unsigned int vers; 1174 /* Whether we had a failure. */ 1175 bfd_boolean failed; 1176 }; 1177 1178 /* Some private data is stashed away for future use using the tdata pointer 1179 in the bfd structure. */ 1180 1181 struct elf_obj_tdata 1182 { 1183 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */ 1184 Elf_Internal_Shdr **elf_sect_ptr; 1185 Elf_Internal_Phdr *phdr; 1186 struct elf_segment_map *segment_map; 1187 struct elf_strtab_hash *strtab_ptr; 1188 int num_locals; 1189 int num_globals; 1190 unsigned int num_elf_sections; /* elf_sect_ptr size */ 1191 int num_section_syms; 1192 asymbol **section_syms; /* STT_SECTION symbols for each section */ 1193 Elf_Internal_Shdr symtab_hdr; 1194 Elf_Internal_Shdr shstrtab_hdr; 1195 Elf_Internal_Shdr strtab_hdr; 1196 Elf_Internal_Shdr dynsymtab_hdr; 1197 Elf_Internal_Shdr dynstrtab_hdr; 1198 Elf_Internal_Shdr dynversym_hdr; 1199 Elf_Internal_Shdr dynverref_hdr; 1200 Elf_Internal_Shdr dynverdef_hdr; 1201 Elf_Internal_Shdr symtab_shndx_hdr; 1202 unsigned int symtab_section, shstrtab_section; 1203 unsigned int strtab_section, dynsymtab_section; 1204 unsigned int symtab_shndx_section; 1205 unsigned int dynversym_section, dynverdef_section, dynverref_section; 1206 file_ptr next_file_pos; 1207 bfd_vma gp; /* The gp value */ 1208 unsigned int gp_size; /* The gp size */ 1209 1210 /* Information grabbed from an elf core file. */ 1211 int core_signal; 1212 int core_pid; 1213 int core_lwpid; 1214 char* core_program; 1215 char* core_command; 1216 1217 /* A mapping from external symbols to entries in the linker hash 1218 table, used when linking. This is indexed by the symbol index 1219 minus the sh_info field of the symbol table header. */ 1220 struct elf_link_hash_entry **sym_hashes; 1221 1222 /* Track usage and final offsets of GOT entries for local symbols. 1223 This array is indexed by symbol index. Elements are used 1224 identically to "got" in struct elf_link_hash_entry. */ 1225 union 1226 { 1227 bfd_signed_vma *refcounts; 1228 bfd_vma *offsets; 1229 struct got_entry **ents; 1230 } local_got; 1231 1232 /* The linker ELF emulation code needs to let the backend ELF linker 1233 know what filename should be used for a dynamic object if the 1234 dynamic object is found using a search. The emulation code then 1235 sometimes needs to know what name was actually used. Until the 1236 file has been added to the linker symbol table, this field holds 1237 the name the linker wants. After it has been added, it holds the 1238 name actually used, which will be the DT_SONAME entry if there is 1239 one. */ 1240 const char *dt_name; 1241 1242 /* Records the result of `get_program_header_size'. */ 1243 bfd_size_type program_header_size; 1244 1245 /* Used by find_nearest_line entry point. */ 1246 void *line_info; 1247 1248 /* Used by MIPS ELF find_nearest_line entry point. The structure 1249 could be included directly in this one, but there's no point to 1250 wasting the memory just for the infrequently called 1251 find_nearest_line. */ 1252 struct mips_elf_find_line *find_line_info; 1253 1254 /* A place to stash dwarf1 info for this bfd. */ 1255 struct dwarf1_debug *dwarf1_find_line_info; 1256 1257 /* A place to stash dwarf2 info for this bfd. */ 1258 void *dwarf2_find_line_info; 1259 1260 /* An array of stub sections indexed by symbol number, used by the 1261 MIPS ELF linker. FIXME: We should figure out some way to only 1262 include this field for a MIPS ELF target. */ 1263 asection **local_stubs; 1264 1265 /* Used to determine if PT_GNU_EH_FRAME segment header should be 1266 created. */ 1267 asection *eh_frame_hdr; 1268 1269 Elf_Internal_Shdr **group_sect_ptr; 1270 int num_group; 1271 1272 /* Number of symbol version definitions we are about to emit. */ 1273 unsigned int cverdefs; 1274 1275 /* Number of symbol version references we are about to emit. */ 1276 unsigned int cverrefs; 1277 1278 /* Segment flags for the PT_GNU_STACK segment. */ 1279 unsigned int stack_flags; 1280 1281 /* Should the PT_GNU_RELRO segment be emitted? */ 1282 bfd_boolean relro; 1283 1284 /* Symbol version definitions in external objects. */ 1285 Elf_Internal_Verdef *verdef; 1286 1287 /* Symbol version references to external objects. */ 1288 Elf_Internal_Verneed *verref; 1289 1290 /* The Irix 5 support uses two virtual sections, which represent 1291 text/data symbols defined in dynamic objects. */ 1292 asymbol *elf_data_symbol; 1293 asymbol *elf_text_symbol; 1294 asection *elf_data_section; 1295 asection *elf_text_section; 1296 1297 /* Whether a dyanmic object was specified normally on the linker 1298 command line, or was specified when --as-needed was in effect, 1299 or was found via a DT_NEEDED entry. */ 1300 enum dynamic_lib_link_class dyn_lib_class; 1301 1302 /* This is set to TRUE if the object was created by the backend 1303 linker. */ 1304 bfd_boolean linker; 1305 1306 /* Irix 5 often screws up the symbol table, sorting local symbols 1307 after global symbols. This flag is set if the symbol table in 1308 this BFD appears to be screwed up. If it is, we ignore the 1309 sh_info field in the symbol table header, and always read all the 1310 symbols. */ 1311 bfd_boolean bad_symtab; 1312 1313 /* Used to determine if the e_flags field has been initialized */ 1314 bfd_boolean flags_init; 1315 }; 1316 1317 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data) 1318 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header) 1319 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr) 1320 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections) 1321 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr) 1322 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section) 1323 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section) 1324 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section) 1325 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section) 1326 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section) 1327 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section) 1328 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals) 1329 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals) 1330 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms) 1331 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms) 1332 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo) 1333 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus) 1334 #define elf_gp(bfd) (elf_tdata(bfd) -> gp) 1335 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size) 1336 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes) 1337 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts) 1338 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets) 1339 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents) 1340 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name) 1341 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class) 1342 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab) 1343 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init) 1344 1345 extern void _bfd_elf_swap_verdef_in 1346 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *); 1347 extern void _bfd_elf_swap_verdef_out 1348 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *); 1349 extern void _bfd_elf_swap_verdaux_in 1350 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *); 1351 extern void _bfd_elf_swap_verdaux_out 1352 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *); 1353 extern void _bfd_elf_swap_verneed_in 1354 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *); 1355 extern void _bfd_elf_swap_verneed_out 1356 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *); 1357 extern void _bfd_elf_swap_vernaux_in 1358 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *); 1359 extern void _bfd_elf_swap_vernaux_out 1360 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *); 1361 extern void _bfd_elf_swap_versym_in 1362 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *); 1363 extern void _bfd_elf_swap_versym_out 1364 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *); 1365 1366 extern int _bfd_elf_section_from_bfd_section 1367 (bfd *, asection *); 1368 extern char *bfd_elf_string_from_elf_section 1369 (bfd *, unsigned, unsigned); 1370 extern char *bfd_elf_get_str_section 1371 (bfd *, unsigned); 1372 extern Elf_Internal_Sym *bfd_elf_get_elf_syms 1373 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *, 1374 Elf_External_Sym_Shndx *); 1375 extern const char *bfd_elf_sym_name 1376 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *); 1377 1378 extern bfd_boolean _bfd_elf_copy_private_bfd_data 1379 (bfd *, bfd *); 1380 extern bfd_boolean _bfd_elf_print_private_bfd_data 1381 (bfd *, void *); 1382 extern void bfd_elf_print_symbol 1383 (bfd *, void *, asymbol *, bfd_print_symbol_type); 1384 1385 extern void _bfd_elf_sprintf_vma 1386 (bfd *, char *, bfd_vma); 1387 extern void _bfd_elf_fprintf_vma 1388 (bfd *, void *, bfd_vma); 1389 1390 extern unsigned int _bfd_elf_eh_frame_address_size 1391 (bfd *, asection *); 1392 extern bfd_byte _bfd_elf_encode_eh_address 1393 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset, 1394 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded); 1395 extern bfd_boolean _bfd_elf_can_make_relative 1396 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section); 1397 1398 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class 1399 (const Elf_Internal_Rela *); 1400 extern bfd_vma _bfd_elf_rela_local_sym 1401 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *); 1402 extern bfd_vma _bfd_elf_rel_local_sym 1403 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma); 1404 extern bfd_vma _bfd_elf_section_offset 1405 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1406 1407 extern unsigned long bfd_elf_hash 1408 (const char *); 1409 1410 extern bfd_reloc_status_type bfd_elf_generic_reloc 1411 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 1412 extern bfd_boolean bfd_elf_mkobject 1413 (bfd *); 1414 extern bfd_boolean bfd_elf_mkcorefile 1415 (bfd *); 1416 extern Elf_Internal_Shdr *bfd_elf_find_section 1417 (bfd *, char *); 1418 extern bfd_boolean _bfd_elf_make_section_from_shdr 1419 (bfd *, Elf_Internal_Shdr *, const char *, int); 1420 extern bfd_boolean _bfd_elf_make_section_from_phdr 1421 (bfd *, Elf_Internal_Phdr *, int, const char *); 1422 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc 1423 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 1424 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create 1425 (bfd *); 1426 extern void _bfd_elf_link_hash_copy_indirect 1427 (const struct elf_backend_data *, struct elf_link_hash_entry *, 1428 struct elf_link_hash_entry *); 1429 extern void _bfd_elf_link_hash_hide_symbol 1430 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1431 extern bfd_boolean _bfd_elf_link_hash_table_init 1432 (struct elf_link_hash_table *, bfd *, 1433 struct bfd_hash_entry *(*) 1434 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); 1435 extern bfd_boolean _bfd_elf_slurp_version_tables 1436 (bfd *, bfd_boolean); 1437 extern bfd_boolean _bfd_elf_merge_sections 1438 (bfd *, struct bfd_link_info *); 1439 extern bfd_boolean bfd_elf_is_group_section 1440 (bfd *, const struct bfd_section *); 1441 extern void _bfd_elf_section_already_linked 1442 (bfd *, struct bfd_section *); 1443 extern void bfd_elf_set_group_contents 1444 (bfd *, asection *, void *); 1445 extern asection *_bfd_elf_check_kept_section 1446 (asection *); 1447 extern void _bfd_elf_link_just_syms 1448 (asection *, struct bfd_link_info *); 1449 extern bfd_boolean _bfd_elf_copy_private_header_data 1450 (bfd *, bfd *); 1451 extern bfd_boolean _bfd_elf_copy_private_symbol_data 1452 (bfd *, asymbol *, bfd *, asymbol *); 1453 extern bfd_boolean _bfd_elf_copy_private_section_data 1454 (bfd *, asection *, bfd *, asection *); 1455 extern bfd_boolean _bfd_elf_write_object_contents 1456 (bfd *); 1457 extern bfd_boolean _bfd_elf_write_corefile_contents 1458 (bfd *); 1459 extern bfd_boolean _bfd_elf_set_section_contents 1460 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type); 1461 extern long _bfd_elf_get_symtab_upper_bound 1462 (bfd *); 1463 extern long _bfd_elf_canonicalize_symtab 1464 (bfd *, asymbol **); 1465 extern long _bfd_elf_get_dynamic_symtab_upper_bound 1466 (bfd *); 1467 extern long _bfd_elf_canonicalize_dynamic_symtab 1468 (bfd *, asymbol **); 1469 extern long _bfd_elf_get_synthetic_symtab 1470 (bfd *, long, asymbol **, long, asymbol **, asymbol **); 1471 extern long _bfd_elf_get_reloc_upper_bound 1472 (bfd *, sec_ptr); 1473 extern long _bfd_elf_canonicalize_reloc 1474 (bfd *, sec_ptr, arelent **, asymbol **); 1475 extern long _bfd_elf_get_dynamic_reloc_upper_bound 1476 (bfd *); 1477 extern long _bfd_elf_canonicalize_dynamic_reloc 1478 (bfd *, arelent **, asymbol **); 1479 extern asymbol *_bfd_elf_make_empty_symbol 1480 (bfd *); 1481 extern void _bfd_elf_get_symbol_info 1482 (bfd *, asymbol *, symbol_info *); 1483 extern bfd_boolean _bfd_elf_is_local_label_name 1484 (bfd *, const char *); 1485 extern alent *_bfd_elf_get_lineno 1486 (bfd *, asymbol *); 1487 extern bfd_boolean _bfd_elf_set_arch_mach 1488 (bfd *, enum bfd_architecture, unsigned long); 1489 extern bfd_boolean _bfd_elf_find_nearest_line 1490 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **, 1491 unsigned int *); 1492 extern bfd_boolean _bfd_elf_find_line 1493 (bfd *, asymbol **, asymbol *, const char **, unsigned int *); 1494 #define _bfd_generic_find_line _bfd_elf_find_line 1495 extern bfd_boolean _bfd_elf_find_inliner_info 1496 (bfd *, const char **, const char **, unsigned int *); 1497 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols 1498 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 1499 extern int _bfd_elf_sizeof_headers 1500 (bfd *, bfd_boolean); 1501 extern bfd_boolean _bfd_elf_new_section_hook 1502 (bfd *, asection *); 1503 extern bfd_boolean _bfd_elf_init_reloc_shdr 1504 (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean); 1505 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section 1506 (const char *, const struct bfd_elf_special_section *, unsigned int); 1507 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr 1508 (bfd *, asection *); 1509 1510 /* If the target doesn't have reloc handling written yet: */ 1511 extern void _bfd_elf_no_info_to_howto 1512 (bfd *, arelent *, Elf_Internal_Rela *); 1513 1514 extern bfd_boolean bfd_section_from_shdr 1515 (bfd *, unsigned int shindex); 1516 extern bfd_boolean bfd_section_from_phdr 1517 (bfd *, Elf_Internal_Phdr *, int); 1518 1519 extern int _bfd_elf_symbol_from_bfd_symbol 1520 (bfd *, asymbol **); 1521 1522 extern asection *bfd_section_from_r_symndx 1523 (bfd *, struct sym_sec_cache *, asection *, unsigned long); 1524 extern asection *bfd_section_from_elf_index 1525 (bfd *, unsigned int); 1526 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init 1527 (void); 1528 1529 extern struct elf_strtab_hash * _bfd_elf_strtab_init 1530 (void); 1531 extern void _bfd_elf_strtab_free 1532 (struct elf_strtab_hash *); 1533 extern bfd_size_type _bfd_elf_strtab_add 1534 (struct elf_strtab_hash *, const char *, bfd_boolean); 1535 extern void _bfd_elf_strtab_addref 1536 (struct elf_strtab_hash *, bfd_size_type); 1537 extern void _bfd_elf_strtab_delref 1538 (struct elf_strtab_hash *, bfd_size_type); 1539 extern void _bfd_elf_strtab_clear_all_refs 1540 (struct elf_strtab_hash *); 1541 extern bfd_size_type _bfd_elf_strtab_size 1542 (struct elf_strtab_hash *); 1543 extern bfd_size_type _bfd_elf_strtab_offset 1544 (struct elf_strtab_hash *, bfd_size_type); 1545 extern bfd_boolean _bfd_elf_strtab_emit 1546 (bfd *, struct elf_strtab_hash *); 1547 extern void _bfd_elf_strtab_finalize 1548 (struct elf_strtab_hash *); 1549 1550 extern bfd_boolean _bfd_elf_discard_section_eh_frame 1551 (bfd *, struct bfd_link_info *, asection *, 1552 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *); 1553 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr 1554 (bfd *, struct bfd_link_info *); 1555 extern bfd_vma _bfd_elf_eh_frame_section_offset 1556 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1557 extern bfd_boolean _bfd_elf_write_section_eh_frame 1558 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 1559 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr 1560 (bfd *, struct bfd_link_info *); 1561 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr 1562 (struct bfd_link_info *); 1563 1564 extern bfd_boolean _bfd_elf_merge_symbol 1565 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *, 1566 asection **, bfd_vma *, unsigned int *, 1567 struct elf_link_hash_entry **, bfd_boolean *, 1568 bfd_boolean *, bfd_boolean *, bfd_boolean *); 1569 1570 extern bfd_boolean _bfd_elf_add_default_symbol 1571 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, 1572 const char *, Elf_Internal_Sym *, asection **, bfd_vma *, 1573 bfd_boolean *, bfd_boolean); 1574 1575 extern bfd_boolean _bfd_elf_export_symbol 1576 (struct elf_link_hash_entry *, void *); 1577 1578 extern bfd_boolean _bfd_elf_link_find_version_dependencies 1579 (struct elf_link_hash_entry *, void *); 1580 1581 extern bfd_boolean _bfd_elf_link_assign_sym_version 1582 (struct elf_link_hash_entry *, void *); 1583 1584 extern long _bfd_elf_link_lookup_local_dynindx 1585 (struct bfd_link_info *, bfd *, long); 1586 extern bfd_boolean _bfd_elf_compute_section_file_positions 1587 (bfd *, struct bfd_link_info *); 1588 extern void _bfd_elf_assign_file_positions_for_relocs 1589 (bfd *); 1590 extern file_ptr _bfd_elf_assign_file_position_for_section 1591 (Elf_Internal_Shdr *, file_ptr, bfd_boolean); 1592 1593 extern bfd_boolean _bfd_elf_validate_reloc 1594 (bfd *, arelent *); 1595 1596 extern bfd_boolean _bfd_elf_link_create_dynamic_sections 1597 (bfd *, struct bfd_link_info *); 1598 extern bfd_boolean _bfd_elf_link_omit_section_dynsym 1599 (bfd *, struct bfd_link_info *, asection *); 1600 extern bfd_boolean _bfd_elf_create_dynamic_sections 1601 (bfd *, struct bfd_link_info *); 1602 extern bfd_boolean _bfd_elf_create_got_section 1603 (bfd *, struct bfd_link_info *); 1604 1605 extern bfd_boolean _bfd_elfcore_make_pseudosection 1606 (bfd *, char *, size_t, ufile_ptr); 1607 extern char *_bfd_elfcore_strndup 1608 (bfd *, char *, size_t); 1609 1610 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs 1611 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean); 1612 1613 extern bfd_boolean _bfd_elf_link_size_reloc_section 1614 (bfd *, Elf_Internal_Shdr *, asection *); 1615 1616 extern bfd_boolean _bfd_elf_link_output_relocs 1617 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 1618 struct elf_link_hash_entry **); 1619 1620 extern bfd_boolean _bfd_elf_fix_symbol_flags 1621 (struct elf_link_hash_entry *, struct elf_info_failed *); 1622 1623 extern bfd_boolean _bfd_elf_adjust_dynamic_symbol 1624 (struct elf_link_hash_entry *, void *); 1625 1626 extern bfd_boolean _bfd_elf_link_sec_merge_syms 1627 (struct elf_link_hash_entry *, void *); 1628 1629 extern bfd_boolean _bfd_elf_dynamic_symbol_p 1630 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 1631 1632 extern bfd_boolean _bfd_elf_symbol_refs_local_p 1633 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 1634 1635 extern bfd_boolean bfd_elf_match_symbols_in_sections 1636 (asection *sec1, asection *sec2); 1637 1638 extern bfd_boolean _bfd_elf_setup_group_pointers 1639 (bfd *); 1640 1641 extern const bfd_target *bfd_elf32_object_p 1642 (bfd *); 1643 extern const bfd_target *bfd_elf32_core_file_p 1644 (bfd *); 1645 extern char *bfd_elf32_core_file_failing_command 1646 (bfd *); 1647 extern int bfd_elf32_core_file_failing_signal 1648 (bfd *); 1649 extern bfd_boolean bfd_elf32_core_file_matches_executable_p 1650 (bfd *, bfd *); 1651 1652 extern void bfd_elf32_swap_symbol_in 1653 (bfd *, const void *, const void *, Elf_Internal_Sym *); 1654 extern void bfd_elf32_swap_symbol_out 1655 (bfd *, const Elf_Internal_Sym *, void *, void *); 1656 extern void bfd_elf32_swap_reloc_in 1657 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 1658 extern void bfd_elf32_swap_reloc_out 1659 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 1660 extern void bfd_elf32_swap_reloca_in 1661 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 1662 extern void bfd_elf32_swap_reloca_out 1663 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 1664 extern void bfd_elf32_swap_phdr_in 1665 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *); 1666 extern void bfd_elf32_swap_phdr_out 1667 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *); 1668 extern void bfd_elf32_swap_dyn_in 1669 (bfd *, const void *, Elf_Internal_Dyn *); 1670 extern void bfd_elf32_swap_dyn_out 1671 (bfd *, const Elf_Internal_Dyn *, void *); 1672 extern long bfd_elf32_slurp_symbol_table 1673 (bfd *, asymbol **, bfd_boolean); 1674 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr 1675 (bfd *); 1676 extern int bfd_elf32_write_out_phdrs 1677 (bfd *, const Elf_Internal_Phdr *, unsigned int); 1678 extern void bfd_elf32_write_relocs 1679 (bfd *, asection *, void *); 1680 extern bfd_boolean bfd_elf32_slurp_reloc_table 1681 (bfd *, asection *, asymbol **, bfd_boolean); 1682 1683 extern const bfd_target *bfd_elf64_object_p 1684 (bfd *); 1685 extern const bfd_target *bfd_elf64_core_file_p 1686 (bfd *); 1687 extern char *bfd_elf64_core_file_failing_command 1688 (bfd *); 1689 extern int bfd_elf64_core_file_failing_signal 1690 (bfd *); 1691 extern bfd_boolean bfd_elf64_core_file_matches_executable_p 1692 (bfd *, bfd *); 1693 1694 extern void bfd_elf64_swap_symbol_in 1695 (bfd *, const void *, const void *, Elf_Internal_Sym *); 1696 extern void bfd_elf64_swap_symbol_out 1697 (bfd *, const Elf_Internal_Sym *, void *, void *); 1698 extern void bfd_elf64_swap_reloc_in 1699 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 1700 extern void bfd_elf64_swap_reloc_out 1701 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 1702 extern void bfd_elf64_swap_reloca_in 1703 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 1704 extern void bfd_elf64_swap_reloca_out 1705 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 1706 extern void bfd_elf64_swap_phdr_in 1707 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *); 1708 extern void bfd_elf64_swap_phdr_out 1709 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *); 1710 extern void bfd_elf64_swap_dyn_in 1711 (bfd *, const void *, Elf_Internal_Dyn *); 1712 extern void bfd_elf64_swap_dyn_out 1713 (bfd *, const Elf_Internal_Dyn *, void *); 1714 extern long bfd_elf64_slurp_symbol_table 1715 (bfd *, asymbol **, bfd_boolean); 1716 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr 1717 (bfd *); 1718 extern int bfd_elf64_write_out_phdrs 1719 (bfd *, const Elf_Internal_Phdr *, unsigned int); 1720 extern void bfd_elf64_write_relocs 1721 (bfd *, asection *, void *); 1722 extern bfd_boolean bfd_elf64_slurp_reloc_table 1723 (bfd *, asection *, asymbol **, bfd_boolean); 1724 1725 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup 1726 (bfd *, struct bfd_link_info *, const char *); 1727 extern bfd_boolean bfd_elf_link_add_symbols 1728 (bfd *, struct bfd_link_info *); 1729 extern bfd_boolean _bfd_elf_add_dynamic_entry 1730 (struct bfd_link_info *, bfd_vma, bfd_vma); 1731 1732 extern bfd_boolean bfd_elf_link_record_dynamic_symbol 1733 (struct bfd_link_info *, struct elf_link_hash_entry *); 1734 1735 extern int bfd_elf_link_record_local_dynamic_symbol 1736 (struct bfd_link_info *, bfd *, long); 1737 1738 extern bfd_boolean _bfd_elf_close_and_cleanup 1739 (bfd *); 1740 1741 extern void _bfd_dwarf2_cleanup_debug_info 1742 (bfd *); 1743 1744 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn 1745 (bfd *, arelent *, struct bfd_symbol *, void *, 1746 asection *, bfd *, char **); 1747 1748 extern bfd_boolean bfd_elf_final_link 1749 (bfd *, struct bfd_link_info *); 1750 1751 extern bfd_boolean bfd_elf_gc_sections 1752 (bfd *, struct bfd_link_info *); 1753 1754 extern bfd_boolean bfd_elf_gc_record_vtinherit 1755 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 1756 1757 extern bfd_boolean bfd_elf_gc_record_vtentry 1758 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 1759 1760 extern bfd_boolean _bfd_elf_gc_mark 1761 (struct bfd_link_info *, asection *, 1762 asection * (*) (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 1763 struct elf_link_hash_entry *, Elf_Internal_Sym *)); 1764 1765 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets 1766 (bfd *, struct bfd_link_info *); 1767 1768 extern bfd_boolean bfd_elf_gc_common_final_link 1769 (bfd *, struct bfd_link_info *); 1770 1771 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p 1772 (bfd_vma, void *); 1773 1774 extern struct elf_segment_map * 1775 _bfd_elf_make_dynamic_segment 1776 (bfd *, asection *); 1777 1778 /* Exported interface for writing elf corefile notes. */ 1779 extern char *elfcore_write_note 1780 (bfd *, char *, int *, const char *, int, const void *, int); 1781 extern char *elfcore_write_prpsinfo 1782 (bfd *, char *, int *, const char *, const char *); 1783 extern char *elfcore_write_prstatus 1784 (bfd *, char *, int *, long, int, const void *); 1785 extern char * elfcore_write_pstatus 1786 (bfd *, char *, int *, long, int, const void *); 1787 extern char *elfcore_write_prfpreg 1788 (bfd *, char *, int *, const void *, int); 1789 extern char *elfcore_write_prxfpreg 1790 (bfd *, char *, int *, const void *, int); 1791 extern char *elfcore_write_lwpstatus 1792 (bfd *, char *, int *, long, int, const void *); 1793 1794 extern bfd *_bfd_elf32_bfd_from_remote_memory 1795 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep, 1796 int (*target_read_memory) (bfd_vma, bfd_byte *, int)); 1797 extern bfd *_bfd_elf64_bfd_from_remote_memory 1798 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep, 1799 int (*target_read_memory) (bfd_vma, bfd_byte *, int)); 1800 1801 /* SH ELF specific routine. */ 1802 1803 extern bfd_boolean _sh_elf_set_mach_from_flags 1804 (bfd *); 1805 1806 /* This is the condition under which finish_dynamic_symbol will be called. 1807 If our finish_dynamic_symbol isn't called, we'll need to do something 1808 about initializing any .plt and .got entries in relocate_section. */ 1809 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \ 1810 ((DYN) \ 1811 && ((SHARED) || !(H)->forced_local) \ 1812 && ((H)->dynindx != -1 || (H)->forced_local)) 1813 1814 /* This macro is to avoid lots of duplicated code in the body 1815 of xxx_relocate_section() in the various elfxx-xxxx.c files. */ 1816 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \ 1817 r_symndx, symtab_hdr, sym_hashes, \ 1818 h, sec, relocation, \ 1819 unresolved_reloc, warned) \ 1820 do \ 1821 { \ 1822 /* It seems this can happen with erroneous or unsupported \ 1823 input (mixing a.out and elf in an archive, for example.) */ \ 1824 if (sym_hashes == NULL) \ 1825 return FALSE; \ 1826 \ 1827 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \ 1828 \ 1829 while (h->root.type == bfd_link_hash_indirect \ 1830 || h->root.type == bfd_link_hash_warning) \ 1831 h = (struct elf_link_hash_entry *) h->root.u.i.link; \ 1832 \ 1833 warned = FALSE; \ 1834 unresolved_reloc = FALSE; \ 1835 relocation = 0; \ 1836 if (h->root.type == bfd_link_hash_defined \ 1837 || h->root.type == bfd_link_hash_defweak) \ 1838 { \ 1839 sec = h->root.u.def.section; \ 1840 if (sec == NULL \ 1841 || sec->output_section == NULL) \ 1842 /* Set a flag that will be cleared later if we find a \ 1843 relocation value for this symbol. output_section \ 1844 is typically NULL for symbols satisfied by a shared \ 1845 library. */ \ 1846 unresolved_reloc = TRUE; \ 1847 else \ 1848 relocation = (h->root.u.def.value \ 1849 + sec->output_section->vma \ 1850 + sec->output_offset); \ 1851 } \ 1852 else if (h->root.type == bfd_link_hash_undefweak) \ 1853 ; \ 1854 else if (info->unresolved_syms_in_objects == RM_IGNORE \ 1855 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \ 1856 ; \ 1857 else \ 1858 { \ 1859 bfd_boolean err; \ 1860 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \ 1861 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \ 1862 if (!info->callbacks->undefined_symbol (info, \ 1863 h->root.root.string, \ 1864 input_bfd, \ 1865 input_section, \ 1866 rel->r_offset, err)) \ 1867 return FALSE; \ 1868 warned = TRUE; \ 1869 } \ 1870 } \ 1871 while (0) 1872 1873 #endif /* _LIBELF_H_ */ 1874