1 /* BFD back-end data structures for ELF files. 2 Copyright 1992-2013 Free Software Foundation, Inc. 3 Written by Cygnus Support. 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #ifndef _LIBELF_H_ 23 #define _LIBELF_H_ 1 24 25 #include "elf/common.h" 26 #include "elf/external.h" 27 #include "elf/internal.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 PR 9934: It is possible to have relocations that do not refer to 34 symbols, thus it is also possible to have a relocation section in 35 an object file, but no symbol table. */ 36 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0) 37 38 /* If size isn't specified as 64 or 32, NAME macro should fail. */ 39 #ifndef NAME 40 #if ARCH_SIZE == 64 41 #define NAME(x, y) x ## 64 ## _ ## y 42 #endif 43 #if ARCH_SIZE == 32 44 #define NAME(x, y) x ## 32 ## _ ## y 45 #endif 46 #endif 47 48 #ifndef NAME 49 #define NAME(x, y) x ## NOSIZE ## _ ## y 50 #endif 51 52 #define ElfNAME(X) NAME(Elf,X) 53 #define elfNAME(X) NAME(elf,X) 54 55 /* Information held for an ELF symbol. The first field is the 56 corresponding asymbol. Every symbol is an ELF file is actually a 57 pointer to this structure, although it is often handled as a 58 pointer to an asymbol. */ 59 60 typedef struct 61 { 62 /* The BFD symbol. */ 63 asymbol symbol; 64 /* ELF symbol information. */ 65 Elf_Internal_Sym internal_elf_sym; 66 /* Backend specific information. */ 67 union 68 { 69 unsigned int hppa_arg_reloc; 70 void *mips_extr; 71 void *any; 72 } 73 tc_data; 74 75 /* Version information. This is from an Elf_Internal_Versym 76 structure in a SHT_GNU_versym section. It is zero if there is no 77 version information. */ 78 unsigned short version; 79 80 } elf_symbol_type; 81 82 struct elf_strtab_hash; 83 struct got_entry; 84 struct plt_entry; 85 86 union gotplt_union 87 { 88 bfd_signed_vma refcount; 89 bfd_vma offset; 90 struct got_entry *glist; 91 struct plt_entry *plist; 92 }; 93 94 struct elf_link_virtual_table_entry 95 { 96 /* Virtual table entry use information. This array is nominally of size 97 size/sizeof(target_void_pointer), though we have to be able to assume 98 and track a size while the symbol is still undefined. It is indexed 99 via offset/sizeof(target_void_pointer). */ 100 size_t size; 101 bfd_boolean *used; 102 103 /* Virtual table derivation info. */ 104 struct elf_link_hash_entry *parent; 105 }; 106 107 /* ELF linker hash table entries. */ 108 109 struct elf_link_hash_entry 110 { 111 struct bfd_link_hash_entry root; 112 113 /* Symbol index in output file. This is initialized to -1. It is 114 set to -2 if the symbol is used by a reloc. */ 115 long indx; 116 117 /* Symbol index as a dynamic symbol. Initialized to -1, and remains 118 -1 if this is not a dynamic symbol. */ 119 /* ??? Note that this is consistently used as a synonym for tests 120 against whether we can perform various simplifying transformations 121 to the code. (E.g. changing a pc-relative jump to a PLT entry 122 into a pc-relative jump to the target function.) That test, which 123 is often relatively complex, and someplaces wrong or incomplete, 124 should really be replaced by a predicate in elflink.c. 125 126 End result: this field -1 does not indicate that the symbol is 127 not in the dynamic symbol table, but rather that the symbol is 128 not visible outside this DSO. */ 129 long dynindx; 130 131 /* If this symbol requires an entry in the global offset table, the 132 processor specific backend uses this field to track usage and 133 final offset. Two schemes are supported: The first assumes that 134 a symbol may only have one GOT entry, and uses REFCOUNT until 135 size_dynamic_sections, at which point the contents of the .got is 136 fixed. Afterward, if OFFSET is -1, then the symbol does not 137 require a global offset table entry. The second scheme allows 138 multiple GOT entries per symbol, managed via a linked list 139 pointed to by GLIST. */ 140 union gotplt_union got; 141 142 /* Same, but tracks a procedure linkage table entry. */ 143 union gotplt_union plt; 144 145 /* Symbol size. */ 146 bfd_size_type size; 147 148 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */ 149 unsigned int type : 8; 150 151 /* Symbol st_other value, symbol visibility. */ 152 unsigned int other : 8; 153 154 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */ 155 unsigned int target_internal : 8; 156 157 /* Symbol is referenced by a non-shared object (other than the object 158 in which it is defined). */ 159 unsigned int ref_regular : 1; 160 /* Symbol is defined by a non-shared object. */ 161 unsigned int def_regular : 1; 162 /* Symbol is referenced by a shared object. */ 163 unsigned int ref_dynamic : 1; 164 /* Symbol is defined by a shared object. */ 165 unsigned int def_dynamic : 1; 166 /* Symbol has a non-weak reference from a non-shared object (other than 167 the object in which it is defined). */ 168 unsigned int ref_regular_nonweak : 1; 169 /* Dynamic symbol has been adjustd. */ 170 unsigned int dynamic_adjusted : 1; 171 /* Symbol needs a copy reloc. */ 172 unsigned int needs_copy : 1; 173 /* Symbol needs a procedure linkage table entry. */ 174 unsigned int needs_plt : 1; 175 /* Symbol appears in a non-ELF input file. */ 176 unsigned int non_elf : 1; 177 /* Symbol should be marked as hidden in the version information. */ 178 unsigned int hidden : 1; 179 /* Symbol was forced to local scope due to a version script file. */ 180 unsigned int forced_local : 1; 181 /* Symbol was forced to be dynamic due to a version script file. */ 182 unsigned int dynamic : 1; 183 /* Symbol was marked during garbage collection. */ 184 unsigned int mark : 1; 185 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is 186 not currently set by all the backends. */ 187 unsigned int non_got_ref : 1; 188 /* Symbol has a definition in a shared object. 189 FIXME: There is no real need for this field if def_dynamic is never 190 cleared and all places that test def_dynamic also test def_regular. */ 191 unsigned int dynamic_def : 1; 192 /* Symbol has a non-weak reference from a shared object. */ 193 unsigned int ref_dynamic_nonweak : 1; 194 /* Symbol is referenced with a relocation where C/C++ pointer equality 195 matters. */ 196 unsigned int pointer_equality_needed : 1; 197 /* Symbol is a unique global symbol. */ 198 unsigned int unique_global : 1; 199 200 /* String table index in .dynstr if this is a dynamic symbol. */ 201 unsigned long dynstr_index; 202 203 union 204 { 205 /* If this is a weak defined symbol from a dynamic object, this 206 field points to a defined symbol with the same value, if there is 207 one. Otherwise it is NULL. */ 208 struct elf_link_hash_entry *weakdef; 209 210 /* Hash value of the name computed using the ELF hash function. 211 Used part way through size_dynamic_sections, after we've finished 212 with weakdefs. */ 213 unsigned long elf_hash_value; 214 } u; 215 216 /* Version information. */ 217 union 218 { 219 /* This field is used for a symbol which is not defined in a 220 regular object. It points to the version information read in 221 from the dynamic object. */ 222 Elf_Internal_Verdef *verdef; 223 /* This field is used for a symbol which is defined in a regular 224 object. It is set up in size_dynamic_sections. It points to 225 the version information we should write out for this symbol. */ 226 struct bfd_elf_version_tree *vertree; 227 } verinfo; 228 229 struct elf_link_virtual_table_entry *vtable; 230 }; 231 232 /* Will references to this symbol always reference the symbol 233 in this object? */ 234 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \ 235 _bfd_elf_symbol_refs_local_p (H, INFO, 0) 236 237 /* Will _calls_ to this symbol always call the version in this object? */ 238 #define SYMBOL_CALLS_LOCAL(INFO, H) \ 239 _bfd_elf_symbol_refs_local_p (H, INFO, 1) 240 241 /* Common symbols that are turned into definitions don't have the 242 DEF_REGULAR flag set, so they might appear to be undefined. */ 243 #define ELF_COMMON_DEF_P(H) \ 244 (!(H)->def_regular \ 245 && !(H)->def_dynamic \ 246 && (H)->root.type == bfd_link_hash_defined) 247 248 /* Records local symbols to be emitted in the dynamic symbol table. */ 249 250 struct elf_link_local_dynamic_entry 251 { 252 struct elf_link_local_dynamic_entry *next; 253 254 /* The input bfd this symbol came from. */ 255 bfd *input_bfd; 256 257 /* The index of the local symbol being copied. */ 258 long input_indx; 259 260 /* The index in the outgoing dynamic symbol table. */ 261 long dynindx; 262 263 /* A copy of the input symbol. */ 264 Elf_Internal_Sym isym; 265 }; 266 267 struct elf_link_loaded_list 268 { 269 struct elf_link_loaded_list *next; 270 bfd *abfd; 271 }; 272 273 /* Structures used by the eh_frame optimization code. */ 274 struct eh_cie_fde 275 { 276 union { 277 struct { 278 /* If REMOVED == 1, this is the CIE that the FDE originally used. 279 The CIE belongs to the same .eh_frame input section as the FDE. 280 281 If REMOVED == 0, this is the CIE that we have chosen to use for 282 the output FDE. The CIE's REMOVED field is also 0, but the CIE 283 might belong to a different .eh_frame input section from the FDE. */ 284 struct eh_cie_fde *cie_inf; 285 struct eh_cie_fde *next_for_section; 286 } fde; 287 struct { 288 /* CIEs have three states: 289 290 - REMOVED && !MERGED: Slated for removal because we haven't yet 291 proven that an FDE needs it. FULL_CIE, if nonnull, points to 292 more detailed information about the CIE. 293 294 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH, 295 which may not belong to the same input section. 296 297 - !REMOVED: We have decided to keep this CIE. SEC is the 298 .eh_frame input section that contains the CIE. */ 299 union { 300 struct cie *full_cie; 301 struct eh_cie_fde *merged_with; 302 asection *sec; 303 } u; 304 305 /* The offset of the personality data from the start of the CIE, 306 or 0 if the CIE doesn't have any. */ 307 unsigned int personality_offset : 8; 308 309 /* True if we have marked relocations associated with this CIE. */ 310 unsigned int gc_mark : 1; 311 312 /* True if we have decided to turn an absolute LSDA encoding into 313 a PC-relative one. */ 314 unsigned int make_lsda_relative : 1; 315 316 /* True if we have decided to turn an absolute personality 317 encoding into a PC-relative one. */ 318 unsigned int make_per_encoding_relative : 1; 319 320 /* True if the CIE contains personality data and if that 321 data uses a PC-relative encoding. Always true when 322 make_per_encoding_relative is. */ 323 unsigned int per_encoding_relative : 1; 324 325 /* True if we need to add an 'R' (FDE encoding) entry to the 326 CIE's augmentation data. */ 327 unsigned int add_fde_encoding : 1; 328 329 /* True if we have merged this CIE with another. */ 330 unsigned int merged : 1; 331 332 /* Unused bits. */ 333 unsigned int pad1 : 18; 334 } cie; 335 } u; 336 unsigned int reloc_index; 337 unsigned int size; 338 unsigned int offset; 339 unsigned int new_offset; 340 unsigned int fde_encoding : 8; 341 unsigned int lsda_encoding : 8; 342 unsigned int lsda_offset : 8; 343 344 /* True if this entry represents a CIE, false if it represents an FDE. */ 345 unsigned int cie : 1; 346 347 /* True if this entry is currently marked for removal. */ 348 unsigned int removed : 1; 349 350 /* True if we need to add a 'z' (augmentation size) entry to the CIE's 351 augmentation data, and an associated byte to each of the CIE's FDEs. */ 352 unsigned int add_augmentation_size : 1; 353 354 /* True if we have decided to convert absolute FDE relocations into 355 relative ones. This applies to the first relocation in the FDE, 356 which is against the code that the FDE describes. */ 357 unsigned int make_relative : 1; 358 359 /* Unused bits. */ 360 unsigned int pad1 : 4; 361 362 unsigned int *set_loc; 363 }; 364 365 struct eh_frame_sec_info 366 { 367 unsigned int count; 368 struct cie *cies; 369 struct eh_cie_fde entry[1]; 370 }; 371 372 struct eh_frame_array_ent 373 { 374 bfd_vma initial_loc; 375 bfd_vma fde; 376 }; 377 378 struct htab; 379 380 struct eh_frame_hdr_info 381 { 382 struct htab *cies; 383 asection *hdr_sec; 384 unsigned int fde_count, array_count; 385 struct eh_frame_array_ent *array; 386 /* TRUE if we should try to merge CIEs between input sections. */ 387 bfd_boolean merge_cies; 388 /* TRUE if all .eh_frames have been parsd. */ 389 bfd_boolean parsed_eh_frames; 390 /* TRUE if .eh_frame_hdr should contain the sorted search table. 391 We build it if we successfully read all .eh_frame input sections 392 and recognize them. */ 393 bfd_boolean table; 394 }; 395 396 /* Enum used to identify target specific extensions to the elf_obj_tdata 397 and elf_link_hash_table structures. Note the enums deliberately start 398 from 1 so that we can detect an uninitialized field. The generic value 399 is last so that additions to this enum do not need to modify more than 400 one line. */ 401 enum elf_target_id 402 { 403 AARCH64_ELF_DATA = 1, 404 ALPHA_ELF_DATA, 405 ARM_ELF_DATA, 406 AVR_ELF_DATA, 407 BFIN_ELF_DATA, 408 CRIS_ELF_DATA, 409 FRV_ELF_DATA, 410 HPPA32_ELF_DATA, 411 HPPA64_ELF_DATA, 412 I386_ELF_DATA, 413 IA64_ELF_DATA, 414 LM32_ELF_DATA, 415 M32R_ELF_DATA, 416 M68HC11_ELF_DATA, 417 M68K_ELF_DATA, 418 METAG_ELF_DATA, 419 MICROBLAZE_ELF_DATA, 420 MIPS_ELF_DATA, 421 MN10300_ELF_DATA, 422 NDS32_ELF_DATA, 423 NIOS2_ELF_DATA, 424 PPC32_ELF_DATA, 425 PPC64_ELF_DATA, 426 S390_ELF_DATA, 427 SH_ELF_DATA, 428 SPARC_ELF_DATA, 429 SPU_ELF_DATA, 430 TIC6X_ELF_DATA, 431 X86_64_ELF_DATA, 432 XTENSA_ELF_DATA, 433 XGATE_ELF_DATA, 434 TILEGX_ELF_DATA, 435 TILEPRO_ELF_DATA, 436 GENERIC_ELF_DATA 437 }; 438 439 /* ELF linker hash table. */ 440 441 struct elf_link_hash_table 442 { 443 struct bfd_link_hash_table root; 444 445 /* An identifier used to distinguish different target 446 specific extensions to this structure. */ 447 enum elf_target_id hash_table_id; 448 449 /* Whether we have created the special dynamic sections required 450 when linking against or generating a shared object. */ 451 bfd_boolean dynamic_sections_created; 452 453 /* True if this target has relocatable executables, so needs dynamic 454 section symbols. */ 455 bfd_boolean is_relocatable_executable; 456 457 /* The BFD used to hold special sections created by the linker. 458 This will be the first BFD found which requires these sections to 459 be created. */ 460 bfd *dynobj; 461 462 /* The value to use when initialising got.refcount/offset and 463 plt.refcount/offset in an elf_link_hash_entry. Set to zero when 464 the values are refcounts. Set to init_got_offset/init_plt_offset 465 in size_dynamic_sections when the values may be offsets. */ 466 union gotplt_union init_got_refcount; 467 union gotplt_union init_plt_refcount; 468 469 /* The value to use for got.refcount/offset and plt.refcount/offset 470 when the values may be offsets. Normally (bfd_vma) -1. */ 471 union gotplt_union init_got_offset; 472 union gotplt_union init_plt_offset; 473 474 /* The number of symbols found in the link which must be put into 475 the .dynsym section. */ 476 bfd_size_type dynsymcount; 477 478 /* The string table of dynamic symbols, which becomes the .dynstr 479 section. */ 480 struct elf_strtab_hash *dynstr; 481 482 /* The number of buckets in the hash table in the .hash section. 483 This is based on the number of dynamic symbols. */ 484 bfd_size_type bucketcount; 485 486 /* A linked list of DT_NEEDED names found in dynamic objects 487 included in the link. */ 488 struct bfd_link_needed_list *needed; 489 490 /* Sections in the output bfd that provides a section symbol 491 to be used by relocations emitted against local symbols. 492 Most targets will not use data_index_section. */ 493 asection *text_index_section; 494 asection *data_index_section; 495 496 /* The _GLOBAL_OFFSET_TABLE_ symbol. */ 497 struct elf_link_hash_entry *hgot; 498 499 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */ 500 struct elf_link_hash_entry *hplt; 501 502 /* The _DYNAMIC symbol. */ 503 struct elf_link_hash_entry *hdynamic; 504 505 /* A pointer to information used to merge SEC_MERGE sections. */ 506 void *merge_info; 507 508 /* Used to link stabs in sections. */ 509 struct stab_info stab_info; 510 511 /* Used by eh_frame code when editing .eh_frame. */ 512 struct eh_frame_hdr_info eh_info; 513 514 /* A linked list of local symbols to be added to .dynsym. */ 515 struct elf_link_local_dynamic_entry *dynlocal; 516 517 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic 518 objects included in the link. */ 519 struct bfd_link_needed_list *runpath; 520 521 /* Cached first output tls section and size of PT_TLS segment. */ 522 asection *tls_sec; 523 bfd_size_type tls_size; 524 525 /* A linked list of BFD's loaded in the link. */ 526 struct elf_link_loaded_list *loaded; 527 528 /* Short-cuts to get to dynamic linker sections. */ 529 asection *sgot; 530 asection *sgotplt; 531 asection *srelgot; 532 asection *splt; 533 asection *srelplt; 534 asection *igotplt; 535 asection *iplt; 536 asection *irelplt; 537 asection *irelifunc; 538 }; 539 540 /* Look up an entry in an ELF linker hash table. */ 541 542 #define elf_link_hash_lookup(table, string, create, copy, follow) \ 543 ((struct elf_link_hash_entry *) \ 544 bfd_link_hash_lookup (&(table)->root, (string), (create), \ 545 (copy), (follow))) 546 547 /* Traverse an ELF linker hash table. */ 548 549 #define elf_link_hash_traverse(table, func, info) \ 550 (bfd_link_hash_traverse \ 551 (&(table)->root, \ 552 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ 553 (info))) 554 555 /* Get the ELF linker hash table from a link_info structure. */ 556 557 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash)) 558 559 #define elf_hash_table_id(table) ((table) -> hash_table_id) 560 561 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */ 562 #define is_elf_hash_table(htab) \ 563 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table) 564 565 /* Used by bfd_sym_from_r_symndx to cache a small number of local 566 symbols. */ 567 #define LOCAL_SYM_CACHE_SIZE 32 568 struct sym_cache 569 { 570 bfd *abfd; 571 unsigned long indx[LOCAL_SYM_CACHE_SIZE]; 572 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE]; 573 }; 574 575 /* Constant information held for an ELF backend. */ 576 577 struct elf_size_info { 578 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr; 579 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note; 580 581 /* The size of entries in the .hash section. */ 582 unsigned char sizeof_hash_entry; 583 584 /* The number of internal relocations to allocate per external 585 relocation entry. */ 586 unsigned char int_rels_per_ext_rel; 587 /* We use some fixed size arrays. This should be large enough to 588 handle all back-ends. */ 589 #define MAX_INT_RELS_PER_EXT_REL 3 590 591 unsigned char arch_size, log_file_align; 592 unsigned char elfclass, ev_current; 593 int (*write_out_phdrs) 594 (bfd *, const Elf_Internal_Phdr *, unsigned int); 595 bfd_boolean 596 (*write_shdrs_and_ehdr) (bfd *); 597 bfd_boolean (*checksum_contents) 598 (bfd * , void (*) (const void *, size_t, void *), void *); 599 void (*write_relocs) 600 (bfd *, asection *, void *); 601 bfd_boolean (*swap_symbol_in) 602 (bfd *, const void *, const void *, Elf_Internal_Sym *); 603 void (*swap_symbol_out) 604 (bfd *, const Elf_Internal_Sym *, void *, void *); 605 bfd_boolean (*slurp_reloc_table) 606 (bfd *, asection *, asymbol **, bfd_boolean); 607 long (*slurp_symbol_table) 608 (bfd *, asymbol **, bfd_boolean); 609 void (*swap_dyn_in) 610 (bfd *, const void *, Elf_Internal_Dyn *); 611 void (*swap_dyn_out) 612 (bfd *, const Elf_Internal_Dyn *, void *); 613 614 /* This function is called to swap in a REL relocation. If an 615 external relocation corresponds to more than one internal 616 relocation, then all relocations are swapped in at once. */ 617 void (*swap_reloc_in) 618 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 619 620 /* This function is called to swap out a REL relocation. */ 621 void (*swap_reloc_out) 622 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 623 624 /* This function is called to swap in a RELA relocation. If an 625 external relocation corresponds to more than one internal 626 relocation, then all relocations are swapped in at once. */ 627 void (*swap_reloca_in) 628 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 629 630 /* This function is called to swap out a RELA relocation. */ 631 void (*swap_reloca_out) 632 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 633 }; 634 635 #define elf_symbol_from(ABFD,S) \ 636 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \ 637 && (S)->the_bfd->tdata.elf_obj_data != 0) \ 638 ? (elf_symbol_type *) (S) \ 639 : 0) 640 641 enum elf_reloc_type_class { 642 reloc_class_normal, 643 reloc_class_relative, 644 reloc_class_plt, 645 reloc_class_copy, 646 reloc_class_ifunc 647 }; 648 649 struct elf_reloc_cookie 650 { 651 Elf_Internal_Rela *rels, *rel, *relend; 652 Elf_Internal_Sym *locsyms; 653 bfd *abfd; 654 size_t locsymcount; 655 size_t extsymoff; 656 struct elf_link_hash_entry **sym_hashes; 657 int r_sym_shift; 658 bfd_boolean bad_symtab; 659 }; 660 661 /* The level of IRIX compatibility we're striving for. */ 662 663 typedef enum { 664 ict_none, 665 ict_irix5, 666 ict_irix6 667 } irix_compat_t; 668 669 /* Mapping of ELF section names and types. */ 670 struct bfd_elf_special_section 671 { 672 const char *prefix; 673 int prefix_length; 674 /* 0 means name must match PREFIX exactly. 675 -1 means name must start with PREFIX followed by an arbitrary string. 676 -2 means name must match PREFIX exactly or consist of PREFIX followed 677 by a dot then anything. 678 > 0 means name must start with the first PREFIX_LENGTH chars of 679 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */ 680 int suffix_length; 681 int type; 682 bfd_vma attr; 683 }; 684 685 enum action_discarded 686 { 687 COMPLAIN = 1, 688 PRETEND = 2 689 }; 690 691 typedef asection * (*elf_gc_mark_hook_fn) 692 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 693 struct elf_link_hash_entry *, Elf_Internal_Sym *); 694 695 struct elf_backend_data 696 { 697 /* The architecture for this backend. */ 698 enum bfd_architecture arch; 699 700 /* An identifier used to distinguish different target specific 701 extensions to elf_obj_tdata and elf_link_hash_table structures. */ 702 enum elf_target_id target_id; 703 704 /* The ELF machine code (EM_xxxx) for this backend. */ 705 int elf_machine_code; 706 707 /* EI_OSABI. */ 708 int elf_osabi; 709 710 /* The maximum page size for this backend. */ 711 bfd_vma maxpagesize; 712 713 /* The minimum page size for this backend. An input object will not be 714 considered page aligned unless its sections are correctly aligned for 715 pages at least this large. May be smaller than maxpagesize. */ 716 bfd_vma minpagesize; 717 718 /* The common page size for this backend. */ 719 bfd_vma commonpagesize; 720 721 /* The BFD flags applied to sections created for dynamic linking. */ 722 flagword dynamic_sec_flags; 723 724 /* Architecture-specific data for this backend. 725 This is actually a pointer to some type like struct elf_ARCH_data. */ 726 const void *arch_data; 727 728 /* A function to translate an ELF RELA relocation to a BFD arelent 729 structure. */ 730 void (*elf_info_to_howto) 731 (bfd *, arelent *, Elf_Internal_Rela *); 732 733 /* A function to translate an ELF REL relocation to a BFD arelent 734 structure. */ 735 void (*elf_info_to_howto_rel) 736 (bfd *, arelent *, Elf_Internal_Rela *); 737 738 /* A function to determine whether a symbol is global when 739 partitioning the symbol table into local and global symbols. 740 This should be NULL for most targets, in which case the correct 741 thing will be done. MIPS ELF, at least on the Irix 5, has 742 special requirements. */ 743 bfd_boolean (*elf_backend_sym_is_global) 744 (bfd *, asymbol *); 745 746 /* The remaining functions are hooks which are called only if they 747 are not NULL. */ 748 749 /* A function to permit a backend specific check on whether a 750 particular BFD format is relevant for an object file, and to 751 permit the backend to set any global information it wishes. When 752 this is called elf_elfheader is set, but anything else should be 753 used with caution. If this returns FALSE, the check_format 754 routine will return a bfd_error_wrong_format error. */ 755 bfd_boolean (*elf_backend_object_p) 756 (bfd *); 757 758 /* A function to do additional symbol processing when reading the 759 ELF symbol table. This is where any processor-specific special 760 section indices are handled. */ 761 void (*elf_backend_symbol_processing) 762 (bfd *, asymbol *); 763 764 /* A function to do additional symbol processing after reading the 765 entire ELF symbol table. */ 766 bfd_boolean (*elf_backend_symbol_table_processing) 767 (bfd *, elf_symbol_type *, unsigned int); 768 769 /* A function to set the type of the info field. Processor-specific 770 types should be handled here. */ 771 int (*elf_backend_get_symbol_type) 772 (Elf_Internal_Sym *, int); 773 774 /* A function to return the linker hash table entry of a symbol that 775 might be satisfied by an archive symbol. */ 776 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup) 777 (bfd *, struct bfd_link_info *, const char *); 778 779 /* Return true if local section symbols should have a non-null st_name. 780 NULL implies false. */ 781 bfd_boolean (*elf_backend_name_local_section_symbols) 782 (bfd *); 783 784 /* A function to do additional processing on the ELF section header 785 just before writing it out. This is used to set the flags and 786 type fields for some sections, or to actually write out data for 787 unusual sections. */ 788 bfd_boolean (*elf_backend_section_processing) 789 (bfd *, Elf_Internal_Shdr *); 790 791 /* A function to handle unusual section types when creating BFD 792 sections from ELF sections. */ 793 bfd_boolean (*elf_backend_section_from_shdr) 794 (bfd *, Elf_Internal_Shdr *, const char *, int); 795 796 /* A function to convert machine dependent ELF section header flags to 797 BFD internal section header flags. */ 798 bfd_boolean (*elf_backend_section_flags) 799 (flagword *, const Elf_Internal_Shdr *); 800 801 /* A function that returns a struct containing ELF section flags and 802 type for the given BFD section. */ 803 const struct bfd_elf_special_section * (*get_sec_type_attr) 804 (bfd *, asection *); 805 806 /* A function to handle unusual program segment types when creating BFD 807 sections from ELF program segments. */ 808 bfd_boolean (*elf_backend_section_from_phdr) 809 (bfd *, Elf_Internal_Phdr *, int, const char *); 810 811 /* A function to set up the ELF section header for a BFD section in 812 preparation for writing it out. This is where the flags and type 813 fields are set for unusual sections. */ 814 bfd_boolean (*elf_backend_fake_sections) 815 (bfd *, Elf_Internal_Shdr *, asection *); 816 817 /* A function to get the ELF section index for a BFD section. If 818 this returns TRUE, the section was found. If it is a normal ELF 819 section, *RETVAL should be left unchanged. If it is not a normal 820 ELF section *RETVAL should be set to the SHN_xxxx index. */ 821 bfd_boolean (*elf_backend_section_from_bfd_section) 822 (bfd *, asection *, int *retval); 823 824 /* If this field is not NULL, it is called by the add_symbols phase 825 of a link just before adding a symbol to the global linker hash 826 table. It may modify any of the fields as it wishes. If *NAME 827 is set to NULL, the symbol will be skipped rather than being 828 added to the hash table. This function is responsible for 829 handling all processor dependent symbol bindings and section 830 indices, and must set at least *FLAGS and *SEC for each processor 831 dependent case; failure to do so will cause a link error. */ 832 bfd_boolean (*elf_add_symbol_hook) 833 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *, 834 const char **name, flagword *flags, asection **sec, bfd_vma *value); 835 836 /* If this field is not NULL, it is called by the elf_link_output_sym 837 phase of a link for each symbol which will appear in the object file. 838 On error, this function returns 0. 1 is returned when the symbol 839 should be output, 2 is returned when the symbol should be discarded. */ 840 int (*elf_backend_link_output_symbol_hook) 841 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *, 842 asection *, struct elf_link_hash_entry *); 843 844 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend 845 linker the first time it encounters a dynamic object in the link. 846 This function must create any sections required for dynamic 847 linking. The ABFD argument is a dynamic object. The .interp, 848 .dynamic, .dynsym, .dynstr, and .hash functions have already been 849 created, and this function may modify the section flags if 850 desired. This function will normally create the .got and .plt 851 sections, but different backends have different requirements. */ 852 bfd_boolean (*elf_backend_create_dynamic_sections) 853 (bfd *abfd, struct bfd_link_info *info); 854 855 /* When creating a shared library, determine whether to omit the 856 dynamic symbol for the section. */ 857 bfd_boolean (*elf_backend_omit_section_dynsym) 858 (bfd *output_bfd, struct bfd_link_info *info, asection *osec); 859 860 /* Return TRUE if relocations of targets are compatible to the extent 861 that CHECK_RELOCS will properly process them. PR 4424. */ 862 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *); 863 864 /* The CHECK_RELOCS function is called by the add_symbols phase of 865 the ELF backend linker. It is called once for each section with 866 relocs of an object file, just after the symbols for the object 867 file have been added to the global linker hash table. The 868 function must look through the relocs and do any special handling 869 required. This generally means allocating space in the global 870 offset table, and perhaps allocating space for a reloc. The 871 relocs are always passed as Rela structures; if the section 872 actually uses Rel structures, the r_addend field will always be 873 zero. */ 874 bfd_boolean (*check_relocs) 875 (bfd *abfd, struct bfd_link_info *info, asection *o, 876 const Elf_Internal_Rela *relocs); 877 878 /* The CHECK_DIRECTIVES function is called once per input file by 879 the add_symbols phase of the ELF backend linker. The function 880 must inspect the bfd and create any additional symbols according 881 to any custom directives in the bfd. */ 882 bfd_boolean (*check_directives) 883 (bfd *abfd, struct bfd_link_info *info); 884 885 /* The NOTICE_AS_NEEDED function is called as the linker is about to 886 handle an as-needed lib (ACT = notice_as_needed), and after the 887 linker has decided to keep the lib (ACT = notice_needed) or when 888 the lib is not needed (ACT = notice_not_needed). */ 889 bfd_boolean (*notice_as_needed) 890 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act); 891 892 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend 893 linker for every symbol which is defined by a dynamic object and 894 referenced by a regular object. This is called after all the 895 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS 896 function has been called. The hash table entry should be 897 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be 898 defined in a section from a dynamic object. Dynamic object 899 sections are not included in the final link, and this function is 900 responsible for changing the value to something which the rest of 901 the link can deal with. This will normally involve adding an 902 entry to the .plt or .got or some such section, and setting the 903 symbol to point to that. */ 904 bfd_boolean (*elf_backend_adjust_dynamic_symbol) 905 (struct bfd_link_info *info, struct elf_link_hash_entry *h); 906 907 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker 908 after all the linker input files have been seen but before the 909 section sizes have been set. This is called after 910 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */ 911 bfd_boolean (*elf_backend_always_size_sections) 912 (bfd *output_bfd, struct bfd_link_info *info); 913 914 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend 915 linker after all the linker input files have been seen but before 916 the sections sizes have been set. This is called after 917 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols. 918 It is only called when linking against a dynamic object. It must 919 set the sizes of the dynamic sections, and may fill in their 920 contents as well. The generic ELF linker can handle the .dynsym, 921 .dynstr and .hash sections. This function must handle the 922 .interp section and any sections created by the 923 CREATE_DYNAMIC_SECTIONS entry point. */ 924 bfd_boolean (*elf_backend_size_dynamic_sections) 925 (bfd *output_bfd, struct bfd_link_info *info); 926 927 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections 928 we keep to use as a base for relocs and symbols. */ 929 void (*elf_backend_init_index_section) 930 (bfd *output_bfd, struct bfd_link_info *info); 931 932 /* The RELOCATE_SECTION function is called by the ELF backend linker 933 to handle the relocations for a section. 934 935 The relocs are always passed as Rela structures; if the section 936 actually uses Rel structures, the r_addend field will always be 937 zero. 938 939 This function is responsible for adjust the section contents as 940 necessary, and (if using Rela relocs and generating a 941 relocatable output file) adjusting the reloc addend as 942 necessary. 943 944 This function does not have to worry about setting the reloc 945 address or the reloc symbol index. 946 947 LOCAL_SYMS is a pointer to the swapped in local symbols. 948 949 LOCAL_SECTIONS is an array giving the section in the input file 950 corresponding to the st_shndx field of each local symbol. 951 952 The global hash table entry for the global symbols can be found 953 via elf_sym_hashes (input_bfd). 954 955 When generating relocatable output, this function must handle 956 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 957 going to be the section symbol corresponding to the output 958 section, which means that the addend must be adjusted 959 accordingly. 960 961 Returns FALSE on error, TRUE on success, 2 if successful and 962 relocations should be written for this section. */ 963 int (*elf_backend_relocate_section) 964 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd, 965 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs, 966 Elf_Internal_Sym *local_syms, asection **local_sections); 967 968 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend 969 linker just before it writes a symbol out to the .dynsym section. 970 The processor backend may make any required adjustment to the 971 symbol. It may also take the opportunity to set contents of the 972 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on 973 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called 974 on those symbols which are defined by a dynamic object. */ 975 bfd_boolean (*elf_backend_finish_dynamic_symbol) 976 (bfd *output_bfd, struct bfd_link_info *info, 977 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym); 978 979 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend 980 linker just before it writes all the dynamic sections out to the 981 output file. The FINISH_DYNAMIC_SYMBOL will have been called on 982 all dynamic symbols. */ 983 bfd_boolean (*elf_backend_finish_dynamic_sections) 984 (bfd *output_bfd, struct bfd_link_info *info); 985 986 /* A function to do any beginning processing needed for the ELF file 987 before building the ELF headers and computing file positions. */ 988 void (*elf_backend_begin_write_processing) 989 (bfd *, struct bfd_link_info *); 990 991 /* A function to do any final processing needed for the ELF file 992 before writing it out. The LINKER argument is TRUE if this BFD 993 was created by the ELF backend linker. */ 994 void (*elf_backend_final_write_processing) 995 (bfd *, bfd_boolean linker); 996 997 /* This function is called by get_program_header_size. It should 998 return the number of additional program segments which this BFD 999 will need. It should return -1 on error. */ 1000 int (*elf_backend_additional_program_headers) 1001 (bfd *, struct bfd_link_info *); 1002 1003 /* This function is called to modify an existing segment map in a 1004 backend specific fashion. */ 1005 bfd_boolean (*elf_backend_modify_segment_map) 1006 (bfd *, struct bfd_link_info *); 1007 1008 /* This function is called to modify program headers just before 1009 they are written. */ 1010 bfd_boolean (*elf_backend_modify_program_headers) 1011 (bfd *, struct bfd_link_info *); 1012 1013 /* This function is called before section garbage collection to 1014 mark entry symbol sections. */ 1015 void (*gc_keep) 1016 (struct bfd_link_info *); 1017 1018 /* This function is called during section garbage collection to 1019 mark sections that define global symbols. */ 1020 bfd_boolean (*gc_mark_dynamic_ref) 1021 (struct elf_link_hash_entry *, void *); 1022 1023 /* This function is called during section gc to discover the section a 1024 particular relocation refers to. */ 1025 elf_gc_mark_hook_fn gc_mark_hook; 1026 1027 /* This function, if defined, is called after the first gc marking pass 1028 to allow the backend to mark additional sections. */ 1029 bfd_boolean (*gc_mark_extra_sections) 1030 (struct bfd_link_info *, elf_gc_mark_hook_fn); 1031 1032 /* This function, if defined, is called during the sweep phase of gc 1033 in order that a backend might update any data structures it might 1034 be maintaining. */ 1035 bfd_boolean (*gc_sweep_hook) 1036 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *); 1037 1038 /* This function, if defined, is called after the ELF headers have 1039 been created. This allows for things like the OS and ABI versions 1040 to be changed. */ 1041 void (*elf_backend_post_process_headers) 1042 (bfd *, struct bfd_link_info *); 1043 1044 /* This function, if defined, prints a symbol to file and returns the 1045 name of the symbol to be printed. It should return NULL to fall 1046 back to default symbol printing. */ 1047 const char *(*elf_backend_print_symbol_all) 1048 (bfd *, void *, asymbol *); 1049 1050 /* This function, if defined, is called after all local symbols and 1051 global symbols converted to locals are emitted into the symtab 1052 section. It allows the backend to emit special local symbols 1053 not handled in the hash table. */ 1054 bfd_boolean (*elf_backend_output_arch_local_syms) 1055 (bfd *, struct bfd_link_info *, void *, 1056 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 1057 struct elf_link_hash_entry *)); 1058 1059 /* This function, if defined, is called after all symbols are emitted 1060 into the symtab section. It allows the backend to emit special 1061 global symbols not handled in the hash table. */ 1062 bfd_boolean (*elf_backend_output_arch_syms) 1063 (bfd *, struct bfd_link_info *, void *, 1064 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 1065 struct elf_link_hash_entry *)); 1066 1067 /* Copy any information related to dynamic linking from a pre-existing 1068 symbol to a newly created symbol. Also called to copy flags and 1069 other back-end info to a weakdef, in which case the symbol is not 1070 newly created and plt/got refcounts and dynamic indices should not 1071 be copied. */ 1072 void (*elf_backend_copy_indirect_symbol) 1073 (struct bfd_link_info *, struct elf_link_hash_entry *, 1074 struct elf_link_hash_entry *); 1075 1076 /* Modify any information related to dynamic linking such that the 1077 symbol is not exported. */ 1078 void (*elf_backend_hide_symbol) 1079 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1080 1081 /* A function to do additional symbol fixup, called by 1082 _bfd_elf_fix_symbol_flags. */ 1083 bfd_boolean (*elf_backend_fixup_symbol) 1084 (struct bfd_link_info *, struct elf_link_hash_entry *); 1085 1086 /* Merge the backend specific symbol attribute. */ 1087 void (*elf_backend_merge_symbol_attribute) 1088 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean, 1089 bfd_boolean); 1090 1091 /* This function, if defined, will return a string containing the 1092 name of a target-specific dynamic tag. */ 1093 char *(*elf_backend_get_target_dtag) 1094 (bfd_vma); 1095 1096 /* Decide whether an undefined symbol is special and can be ignored. 1097 This is the case for OPTIONAL symbols on IRIX. */ 1098 bfd_boolean (*elf_backend_ignore_undef_symbol) 1099 (struct elf_link_hash_entry *); 1100 1101 /* Emit relocations. Overrides default routine for emitting relocs, 1102 except during a relocatable link, or if all relocs are being emitted. */ 1103 bfd_boolean (*elf_backend_emit_relocs) 1104 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 1105 struct elf_link_hash_entry **); 1106 1107 /* Count relocations. Not called for relocatable links 1108 or if all relocs are being preserved in the output. */ 1109 unsigned int (*elf_backend_count_relocs) 1110 (struct bfd_link_info *, asection *); 1111 1112 /* This function, if defined, is called when an NT_PRSTATUS note is found 1113 in a core file. */ 1114 bfd_boolean (*elf_backend_grok_prstatus) 1115 (bfd *, Elf_Internal_Note *); 1116 1117 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO 1118 note is found in a core file. */ 1119 bfd_boolean (*elf_backend_grok_psinfo) 1120 (bfd *, Elf_Internal_Note *); 1121 1122 /* This function, if defined, is called to write a note to a corefile. */ 1123 char *(*elf_backend_write_core_note) 1124 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...); 1125 1126 /* This function, if defined, is called to convert target-specific 1127 section flag names into hex values. */ 1128 flagword (*elf_backend_lookup_section_flags_hook) 1129 (char *); 1130 1131 /* This function returns class of a reloc type. */ 1132 enum elf_reloc_type_class (*elf_backend_reloc_type_class) 1133 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *); 1134 1135 /* This function, if defined, removes information about discarded functions 1136 from other sections which mention them. */ 1137 bfd_boolean (*elf_backend_discard_info) 1138 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *); 1139 1140 /* This function, if defined, signals that the function above has removed 1141 the discarded relocations for this section. */ 1142 bfd_boolean (*elf_backend_ignore_discarded_relocs) 1143 (asection *); 1144 1145 /* What to do when ld finds relocations against symbols defined in 1146 discarded sections. */ 1147 unsigned int (*action_discarded) 1148 (asection *); 1149 1150 /* This function returns the width of FDE pointers in bytes, or 0 if 1151 that can't be determined for some reason. The default definition 1152 goes by the bfd's EI_CLASS. */ 1153 unsigned int (*elf_backend_eh_frame_address_size) 1154 (bfd *, asection *); 1155 1156 /* These functions tell elf-eh-frame whether to attempt to turn 1157 absolute or lsda encodings into pc-relative ones. The default 1158 definition enables these transformations. */ 1159 bfd_boolean (*elf_backend_can_make_relative_eh_frame) 1160 (bfd *, struct bfd_link_info *, asection *); 1161 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame) 1162 (bfd *, struct bfd_link_info *, asection *); 1163 1164 /* This function returns an encoding after computing the encoded 1165 value (and storing it in ENCODED) for the given OFFSET into OSEC, 1166 to be stored in at LOC_OFFSET into the LOC_SEC input section. 1167 The default definition chooses a 32-bit PC-relative encoding. */ 1168 bfd_byte (*elf_backend_encode_eh_address) 1169 (bfd *abfd, struct bfd_link_info *info, 1170 asection *osec, bfd_vma offset, 1171 asection *loc_sec, bfd_vma loc_offset, 1172 bfd_vma *encoded); 1173 1174 /* This function, if defined, may write out the given section. 1175 Returns TRUE if it did so and FALSE if the caller should. */ 1176 bfd_boolean (*elf_backend_write_section) 1177 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 1178 1179 /* The level of IRIX compatibility we're striving for. 1180 MIPS ELF specific function. */ 1181 irix_compat_t (*elf_backend_mips_irix_compat) 1182 (bfd *); 1183 1184 reloc_howto_type *(*elf_backend_mips_rtype_to_howto) 1185 (unsigned int, bfd_boolean); 1186 1187 /* The swapping table to use when dealing with ECOFF information. 1188 Used for the MIPS ELF .mdebug section. */ 1189 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap; 1190 1191 /* This function implements `bfd_elf_bfd_from_remote_memory'; 1192 see elf.c, elfcode.h. */ 1193 bfd *(*elf_backend_bfd_from_remote_memory) 1194 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep, 1195 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, 1196 bfd_size_type len)); 1197 1198 /* This function is used by `_bfd_elf_get_synthetic_symtab'; 1199 see elf.c. */ 1200 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *); 1201 1202 /* Is symbol defined in common section? */ 1203 bfd_boolean (*common_definition) (Elf_Internal_Sym *); 1204 1205 /* Return a common section index for section. */ 1206 unsigned int (*common_section_index) (asection *); 1207 1208 /* Return a common section for section. */ 1209 asection *(*common_section) (asection *); 1210 1211 /* Return TRUE if we can merge 2 definitions. */ 1212 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *, 1213 const Elf_Internal_Sym *, asection **, 1214 bfd_boolean, bfd_boolean, 1215 bfd *, const asection *); 1216 1217 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 1218 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *); 1219 1220 /* Return TRUE if type is a function symbol type. */ 1221 bfd_boolean (*is_function_type) (unsigned int type); 1222 1223 /* If the ELF symbol SYM might be a function in SEC, return the 1224 function size and set *CODE_OFF to the function's entry point, 1225 otherwise return zero. */ 1226 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec, 1227 bfd_vma *code_off); 1228 1229 /* Used to handle bad SHF_LINK_ORDER input. */ 1230 bfd_error_handler_type link_order_error_handler; 1231 1232 /* Name of the PLT relocation section. */ 1233 const char *relplt_name; 1234 1235 /* Alternate EM_xxxx machine codes for this backend. */ 1236 int elf_machine_alt1; 1237 int elf_machine_alt2; 1238 1239 const struct elf_size_info *s; 1240 1241 /* An array of target specific special sections. */ 1242 const struct bfd_elf_special_section *special_sections; 1243 1244 /* The size in bytes of the header for the GOT. This includes the 1245 so-called reserved entries on some systems. */ 1246 bfd_vma got_header_size; 1247 1248 /* The size of the GOT entry for the symbol pointed to by H if non-NULL, 1249 otherwise by the local symbol with index SYMNDX in IBFD. */ 1250 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *, 1251 struct elf_link_hash_entry *h, 1252 bfd *ibfd, unsigned long symndx); 1253 1254 /* The vendor name to use for a processor-standard attributes section. */ 1255 const char *obj_attrs_vendor; 1256 1257 /* The section name to use for a processor-standard attributes section. */ 1258 const char *obj_attrs_section; 1259 1260 /* Return 1, 2 or 3 to indicate what type of arguments a 1261 processor-specific tag takes. */ 1262 int (*obj_attrs_arg_type) (int); 1263 1264 /* The section type to use for an attributes section. */ 1265 unsigned int obj_attrs_section_type; 1266 1267 /* This function determines the order in which any attributes are 1268 written. It must be defined for input in the range 1269 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range 1270 is used in order to make unity easy). The returned value is the 1271 actual tag number to place in the input position. */ 1272 int (*obj_attrs_order) (int); 1273 1274 /* Handle merging unknown attributes; either warn and return TRUE, 1275 or give an error and return FALSE. */ 1276 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int); 1277 1278 /* This is non-zero if static TLS segments require a special alignment. */ 1279 unsigned static_tls_alignment; 1280 1281 /* Alignment for the PT_GNU_STACK segment. */ 1282 unsigned stack_align; 1283 1284 /* This is TRUE if the linker should act like collect and gather 1285 global constructors and destructors by name. This is TRUE for 1286 MIPS ELF because the Irix 5 tools can not handle the .init 1287 section. */ 1288 unsigned collect : 1; 1289 1290 /* This is TRUE if the linker should ignore changes to the type of a 1291 symbol. This is TRUE for MIPS ELF because some Irix 5 objects 1292 record undefined functions as STT_OBJECT although the definitions 1293 are STT_FUNC. */ 1294 unsigned type_change_ok : 1; 1295 1296 /* Whether the backend may use REL relocations. (Some backends use 1297 both REL and RELA relocations, and this flag is set for those 1298 backends.) */ 1299 unsigned may_use_rel_p : 1; 1300 1301 /* Whether the backend may use RELA relocations. (Some backends use 1302 both REL and RELA relocations, and this flag is set for those 1303 backends.) */ 1304 unsigned may_use_rela_p : 1; 1305 1306 /* Whether the default relocation type is RELA. If a backend with 1307 this flag set wants REL relocations for a particular section, 1308 it must note that explicitly. Similarly, if this flag is clear, 1309 and the backend wants RELA relocations for a particular 1310 section. */ 1311 unsigned default_use_rela_p : 1; 1312 1313 /* True if PLT and copy relocations should be RELA by default. */ 1314 unsigned rela_plts_and_copies_p : 1; 1315 1316 /* Set if RELA relocations for a relocatable link can be handled by 1317 generic code. Backends that set this flag need do nothing in the 1318 backend relocate_section routine for relocatable linking. */ 1319 unsigned rela_normal : 1; 1320 1321 /* TRUE if addresses "naturally" sign extend. This is used when 1322 swapping in from Elf32 when BFD64. */ 1323 unsigned sign_extend_vma : 1; 1324 1325 unsigned want_got_plt : 1; 1326 unsigned plt_readonly : 1; 1327 unsigned want_plt_sym : 1; 1328 unsigned plt_not_loaded : 1; 1329 unsigned plt_alignment : 4; 1330 unsigned can_gc_sections : 1; 1331 unsigned can_refcount : 1; 1332 unsigned want_got_sym : 1; 1333 unsigned want_dynbss : 1; 1334 1335 /* Targets which do not support physical addressing often require 1336 that the p_paddr field in the section header to be set to zero. 1337 This field indicates whether this behavior is required. */ 1338 unsigned want_p_paddr_set_to_zero : 1; 1339 1340 /* True if an object file lacking a .note.GNU-stack section 1341 should be assumed to be requesting exec stack. At least one 1342 other file in the link needs to have a .note.GNU-stack section 1343 for a PT_GNU_STACK segment to be created. */ 1344 unsigned default_execstack : 1; 1345 }; 1346 1347 /* Information about reloc sections associated with a bfd_elf_section_data 1348 structure. */ 1349 struct bfd_elf_section_reloc_data 1350 { 1351 /* The ELF header for the reloc section associated with this 1352 section, if any. */ 1353 Elf_Internal_Shdr *hdr; 1354 /* The number of relocations currently assigned to HDR. */ 1355 unsigned int count; 1356 /* The ELF section number of the reloc section. Only used for an 1357 output file. */ 1358 int idx; 1359 /* Used by the backend linker to store the symbol hash table entries 1360 associated with relocs against global symbols. */ 1361 struct elf_link_hash_entry **hashes; 1362 }; 1363 1364 /* Information stored for each BFD section in an ELF file. This 1365 structure is allocated by elf_new_section_hook. */ 1366 1367 struct bfd_elf_section_data 1368 { 1369 /* The ELF header for this section. */ 1370 Elf_Internal_Shdr this_hdr; 1371 1372 /* INPUT_SECTION_FLAGS if specified in the linker script. */ 1373 struct flag_info *section_flag_info; 1374 1375 /* Information about the REL and RELA reloc sections associated 1376 with this section, if any. */ 1377 struct bfd_elf_section_reloc_data rel, rela; 1378 1379 /* The ELF section number of this section. */ 1380 int this_idx; 1381 1382 /* Used by the backend linker when generating a shared library to 1383 record the dynamic symbol index for a section symbol 1384 corresponding to this section. A value of 0 means that there is 1385 no dynamic symbol for this section. */ 1386 int dynindx; 1387 1388 /* A pointer to the linked-to section for SHF_LINK_ORDER. */ 1389 asection *linked_to; 1390 1391 /* A pointer to the swapped relocs. If the section uses REL relocs, 1392 rather than RELA, all the r_addend fields will be zero. This 1393 pointer may be NULL. It is used by the backend linker. */ 1394 Elf_Internal_Rela *relocs; 1395 1396 /* A pointer to a linked list tracking dynamic relocs copied for 1397 local symbols. */ 1398 void *local_dynrel; 1399 1400 /* A pointer to the bfd section used for dynamic relocs. */ 1401 asection *sreloc; 1402 1403 union { 1404 /* Group name, if this section is a member of a group. */ 1405 const char *name; 1406 1407 /* Group signature sym, if this is the SHT_GROUP section. */ 1408 struct bfd_symbol *id; 1409 } group; 1410 1411 /* For a member of a group, points to the SHT_GROUP section. 1412 NULL for the SHT_GROUP section itself and non-group sections. */ 1413 asection *sec_group; 1414 1415 /* A linked list of member sections in the group. Circular when used by 1416 the linker. For the SHT_GROUP section, points at first member. */ 1417 asection *next_in_group; 1418 1419 /* The FDEs associated with this section. The u.fde.next_in_section 1420 field acts as a chain pointer. */ 1421 struct eh_cie_fde *fde_list; 1422 1423 /* A pointer used for various section optimizations. */ 1424 void *sec_info; 1425 }; 1426 1427 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd) 1428 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to) 1429 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type) 1430 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags) 1431 #define elf_group_name(sec) (elf_section_data(sec)->group.name) 1432 #define elf_group_id(sec) (elf_section_data(sec)->group.id) 1433 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group) 1434 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list) 1435 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group) 1436 1437 #define xvec_get_elf_backend_data(xvec) \ 1438 ((const struct elf_backend_data *) (xvec)->backend_data) 1439 1440 #define get_elf_backend_data(abfd) \ 1441 xvec_get_elf_backend_data ((abfd)->xvec) 1442 1443 /* The least object attributes (within an attributes subsection) known 1444 for any target. Some code assumes that the value 0 is not used and 1445 the field for that attribute can instead be used as a marker to 1446 indicate that attributes have been initialized. */ 1447 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2 1448 1449 /* The maximum number of known object attributes for any target. */ 1450 #define NUM_KNOWN_OBJ_ATTRIBUTES 71 1451 1452 /* The value of an object attribute. The type indicates whether the attribute 1453 holds and integer, a string, or both. It can also indicate that there can 1454 be no default (i.e. all values must be written to file, even zero). */ 1455 1456 typedef struct obj_attribute 1457 { 1458 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0) 1459 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1) 1460 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2) 1461 1462 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL) 1463 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL) 1464 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT) 1465 1466 int type; 1467 unsigned int i; 1468 char *s; 1469 } obj_attribute; 1470 1471 typedef struct obj_attribute_list 1472 { 1473 struct obj_attribute_list *next; 1474 int tag; 1475 obj_attribute attr; 1476 } obj_attribute_list; 1477 1478 /* Object attributes may either be defined by the processor ABI, index 1479 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific 1480 (and possibly also processor-specific), index OBJ_ATTR_GNU. */ 1481 #define OBJ_ATTR_PROC 0 1482 #define OBJ_ATTR_GNU 1 1483 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC 1484 #define OBJ_ATTR_LAST OBJ_ATTR_GNU 1485 1486 /* The following object attribute tags are taken as generic, for all 1487 targets and for "gnu" where there is no target standard. */ 1488 enum 1489 { 1490 Tag_NULL = 0, 1491 Tag_File = 1, 1492 Tag_Section = 2, 1493 Tag_Symbol = 3, 1494 Tag_compatibility = 32 1495 }; 1496 1497 /* The following struct stores information about every SystemTap section 1498 found in the object file. */ 1499 struct sdt_note 1500 { 1501 struct sdt_note *next; 1502 bfd_size_type size; 1503 bfd_byte data[1]; 1504 }; 1505 1506 /* NT_GNU_BUILD_ID note type info for input BFDs. */ 1507 struct elf_build_id 1508 { 1509 size_t size; 1510 bfd_byte data[1]; 1511 }; 1512 1513 /* tdata information grabbed from an elf core file. */ 1514 struct core_elf_obj_tdata 1515 { 1516 int signal; 1517 int pid; 1518 int lwpid; 1519 char* program; 1520 char* command; 1521 }; 1522 1523 /* Extra tdata information held for output ELF BFDs. */ 1524 struct output_elf_obj_tdata 1525 { 1526 struct elf_segment_map *seg_map; 1527 struct elf_strtab_hash *strtab_ptr; 1528 1529 /* STT_SECTION symbols for each section */ 1530 asymbol **section_syms; 1531 1532 /* Used to determine if PT_GNU_EH_FRAME segment header should be 1533 created. */ 1534 asection *eh_frame_hdr; 1535 1536 /* NT_GNU_BUILD_ID note type info. */ 1537 struct 1538 { 1539 bfd_boolean (*after_write_object_contents) (bfd *); 1540 const char *style; 1541 asection *sec; 1542 } build_id; 1543 1544 /* Records the result of `get_program_header_size'. */ 1545 bfd_size_type program_header_size; 1546 1547 /* Used when laying out sections. */ 1548 file_ptr next_file_pos; 1549 1550 int num_section_syms; 1551 unsigned int shstrtab_section, strtab_section; 1552 1553 /* Segment flags for the PT_GNU_STACK segment. */ 1554 unsigned int stack_flags; 1555 1556 /* This is set to TRUE if the object was created by the backend 1557 linker. */ 1558 bfd_boolean linker; 1559 1560 /* Used to determine if the e_flags field has been initialized */ 1561 bfd_boolean flags_init; 1562 }; 1563 1564 /* Some private data is stashed away for future use using the tdata pointer 1565 in the bfd structure. */ 1566 1567 struct elf_obj_tdata 1568 { 1569 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */ 1570 Elf_Internal_Shdr **elf_sect_ptr; 1571 Elf_Internal_Phdr *phdr; 1572 Elf_Internal_Shdr symtab_hdr; 1573 Elf_Internal_Shdr shstrtab_hdr; 1574 Elf_Internal_Shdr strtab_hdr; 1575 Elf_Internal_Shdr dynsymtab_hdr; 1576 Elf_Internal_Shdr dynstrtab_hdr; 1577 Elf_Internal_Shdr dynversym_hdr; 1578 Elf_Internal_Shdr dynverref_hdr; 1579 Elf_Internal_Shdr dynverdef_hdr; 1580 Elf_Internal_Shdr symtab_shndx_hdr; 1581 bfd_vma gp; /* The gp value */ 1582 unsigned int gp_size; /* The gp size */ 1583 unsigned int num_elf_sections; /* elf_sect_ptr size */ 1584 1585 /* A mapping from external symbols to entries in the linker hash 1586 table, used when linking. This is indexed by the symbol index 1587 minus the sh_info field of the symbol table header. */ 1588 struct elf_link_hash_entry **sym_hashes; 1589 1590 /* Track usage and final offsets of GOT entries for local symbols. 1591 This array is indexed by symbol index. Elements are used 1592 identically to "got" in struct elf_link_hash_entry. */ 1593 union 1594 { 1595 bfd_signed_vma *refcounts; 1596 bfd_vma *offsets; 1597 struct got_entry **ents; 1598 } local_got; 1599 1600 /* The linker ELF emulation code needs to let the backend ELF linker 1601 know what filename should be used for a dynamic object if the 1602 dynamic object is found using a search. The emulation code then 1603 sometimes needs to know what name was actually used. Until the 1604 file has been added to the linker symbol table, this field holds 1605 the name the linker wants. After it has been added, it holds the 1606 name actually used, which will be the DT_SONAME entry if there is 1607 one. */ 1608 const char *dt_name; 1609 1610 /* The linker emulation needs to know what audit libs 1611 are used by a dynamic object. */ 1612 const char *dt_audit; 1613 1614 /* Used by find_nearest_line entry point. */ 1615 void *line_info; 1616 1617 /* A place to stash dwarf1 info for this bfd. */ 1618 struct dwarf1_debug *dwarf1_find_line_info; 1619 1620 /* A place to stash dwarf2 info for this bfd. */ 1621 void *dwarf2_find_line_info; 1622 1623 /* Stash away info for yet another find line/function variant. */ 1624 void *elf_find_function_cache; 1625 1626 /* Number of symbol version definitions we are about to emit. */ 1627 unsigned int cverdefs; 1628 1629 /* Number of symbol version references we are about to emit. */ 1630 unsigned int cverrefs; 1631 1632 /* Symbol version definitions in external objects. */ 1633 Elf_Internal_Verdef *verdef; 1634 1635 /* Symbol version references to external objects. */ 1636 Elf_Internal_Verneed *verref; 1637 1638 /* A pointer to the .eh_frame section. */ 1639 asection *eh_frame_section; 1640 1641 /* Symbol buffer. */ 1642 void *symbuf; 1643 1644 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES]; 1645 obj_attribute_list *other_obj_attributes[2]; 1646 1647 /* NT_GNU_BUILD_ID note type. */ 1648 struct elf_build_id *build_id; 1649 1650 /* Linked-list containing information about every Systemtap section 1651 found in the object file. Each section corresponds to one entry 1652 in the list. */ 1653 struct sdt_note *sdt_note_head; 1654 1655 Elf_Internal_Shdr **group_sect_ptr; 1656 int num_group; 1657 1658 unsigned int symtab_section, symtab_shndx_section, dynsymtab_section; 1659 unsigned int dynversym_section, dynverdef_section, dynverref_section; 1660 1661 /* An identifier used to distinguish different target 1662 specific extensions to this structure. */ 1663 enum elf_target_id object_id; 1664 1665 /* Whether a dyanmic object was specified normally on the linker 1666 command line, or was specified when --as-needed was in effect, 1667 or was found via a DT_NEEDED entry. */ 1668 enum dynamic_lib_link_class dyn_lib_class; 1669 1670 /* Irix 5 often screws up the symbol table, sorting local symbols 1671 after global symbols. This flag is set if the symbol table in 1672 this BFD appears to be screwed up. If it is, we ignore the 1673 sh_info field in the symbol table header, and always read all the 1674 symbols. */ 1675 bfd_boolean bad_symtab; 1676 1677 /* True if the bfd contains symbols that have the STT_GNU_IFUNC 1678 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi 1679 field in the ELF header structure. */ 1680 bfd_boolean has_gnu_symbols; 1681 1682 /* Information grabbed from an elf core file. */ 1683 struct core_elf_obj_tdata *core; 1684 1685 /* More information held for output ELF BFDs. */ 1686 struct output_elf_obj_tdata *o; 1687 }; 1688 1689 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data) 1690 1691 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id) 1692 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size) 1693 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header) 1694 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr) 1695 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections) 1696 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map) 1697 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos) 1698 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr) 1699 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker) 1700 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags) 1701 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr) 1702 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section) 1703 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section) 1704 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section) 1705 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section) 1706 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr) 1707 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section) 1708 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section) 1709 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section) 1710 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section) 1711 #define elf_eh_frame_section(bfd) \ 1712 (elf_tdata(bfd) -> eh_frame_section) 1713 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms) 1714 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms) 1715 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo) 1716 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus) 1717 #define elf_gp(bfd) (elf_tdata(bfd) -> gp) 1718 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size) 1719 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes) 1720 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts) 1721 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets) 1722 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents) 1723 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name) 1724 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit) 1725 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class) 1726 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab) 1727 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init) 1728 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes) 1729 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes) 1730 #define elf_known_obj_attributes_proc(bfd) \ 1731 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1732 #define elf_other_obj_attributes_proc(bfd) \ 1733 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1734 1735 extern void _bfd_elf_swap_verdef_in 1736 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *); 1737 extern void _bfd_elf_swap_verdef_out 1738 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *); 1739 extern void _bfd_elf_swap_verdaux_in 1740 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *); 1741 extern void _bfd_elf_swap_verdaux_out 1742 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *); 1743 extern void _bfd_elf_swap_verneed_in 1744 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *); 1745 extern void _bfd_elf_swap_verneed_out 1746 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *); 1747 extern void _bfd_elf_swap_vernaux_in 1748 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *); 1749 extern void _bfd_elf_swap_vernaux_out 1750 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *); 1751 extern void _bfd_elf_swap_versym_in 1752 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *); 1753 extern void _bfd_elf_swap_versym_out 1754 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *); 1755 1756 extern unsigned int _bfd_elf_section_from_bfd_section 1757 (bfd *, asection *); 1758 extern char *bfd_elf_string_from_elf_section 1759 (bfd *, unsigned, unsigned); 1760 extern Elf_Internal_Sym *bfd_elf_get_elf_syms 1761 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *, 1762 Elf_External_Sym_Shndx *); 1763 extern const char *bfd_elf_sym_name 1764 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *); 1765 1766 extern bfd_boolean _bfd_elf_copy_private_bfd_data 1767 (bfd *, bfd *); 1768 extern bfd_boolean _bfd_elf_print_private_bfd_data 1769 (bfd *, void *); 1770 extern void bfd_elf_print_symbol 1771 (bfd *, void *, asymbol *, bfd_print_symbol_type); 1772 1773 extern unsigned int _bfd_elf_eh_frame_address_size 1774 (bfd *, asection *); 1775 extern bfd_byte _bfd_elf_encode_eh_address 1776 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset, 1777 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded); 1778 extern bfd_boolean _bfd_elf_can_make_relative 1779 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section); 1780 1781 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class 1782 (const struct bfd_link_info *, const asection *, 1783 const Elf_Internal_Rela *); 1784 extern bfd_vma _bfd_elf_rela_local_sym 1785 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *); 1786 extern bfd_vma _bfd_elf_rel_local_sym 1787 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma); 1788 extern bfd_vma _bfd_elf_section_offset 1789 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1790 1791 extern unsigned long bfd_elf_hash 1792 (const char *); 1793 extern unsigned long bfd_elf_gnu_hash 1794 (const char *); 1795 1796 extern bfd_reloc_status_type bfd_elf_generic_reloc 1797 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 1798 extern bfd_boolean bfd_elf_allocate_object 1799 (bfd *, size_t, enum elf_target_id); 1800 extern bfd_boolean bfd_elf_make_object 1801 (bfd *); 1802 extern bfd_boolean bfd_elf_mkcorefile 1803 (bfd *); 1804 extern bfd_boolean _bfd_elf_make_section_from_shdr 1805 (bfd *, Elf_Internal_Shdr *, const char *, int); 1806 extern bfd_boolean _bfd_elf_make_section_from_phdr 1807 (bfd *, Elf_Internal_Phdr *, int, const char *); 1808 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc 1809 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 1810 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create 1811 (bfd *); 1812 extern void _bfd_elf_link_hash_table_free 1813 (struct bfd_link_hash_table *); 1814 extern void _bfd_elf_link_hash_copy_indirect 1815 (struct bfd_link_info *, struct elf_link_hash_entry *, 1816 struct elf_link_hash_entry *); 1817 extern void _bfd_elf_link_hash_hide_symbol 1818 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1819 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol 1820 (struct bfd_link_info *, struct elf_link_hash_entry *); 1821 extern bfd_boolean _bfd_elf_link_hash_table_init 1822 (struct elf_link_hash_table *, bfd *, 1823 struct bfd_hash_entry *(*) 1824 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *), 1825 unsigned int, enum elf_target_id); 1826 extern bfd_boolean _bfd_elf_slurp_version_tables 1827 (bfd *, bfd_boolean); 1828 extern bfd_boolean _bfd_elf_merge_sections 1829 (bfd *, struct bfd_link_info *); 1830 extern bfd_boolean _bfd_elf_match_sections_by_type 1831 (bfd *, const asection *, bfd *, const asection *); 1832 extern bfd_boolean bfd_elf_is_group_section 1833 (bfd *, const struct bfd_section *); 1834 extern bfd_boolean _bfd_elf_section_already_linked 1835 (bfd *, asection *, struct bfd_link_info *); 1836 extern void bfd_elf_set_group_contents 1837 (bfd *, asection *, void *); 1838 extern asection *_bfd_elf_check_kept_section 1839 (asection *, struct bfd_link_info *); 1840 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms 1841 extern void _bfd_elf_copy_link_hash_symbol_type 1842 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *); 1843 extern bfd_boolean _bfd_elf_size_group_sections 1844 (struct bfd_link_info *); 1845 extern bfd_boolean _bfd_elf_fixup_group_sections 1846 (bfd *, asection *); 1847 extern bfd_boolean _bfd_elf_copy_private_header_data 1848 (bfd *, bfd *); 1849 extern bfd_boolean _bfd_elf_copy_private_symbol_data 1850 (bfd *, asymbol *, bfd *, asymbol *); 1851 #define _bfd_generic_init_private_section_data \ 1852 _bfd_elf_init_private_section_data 1853 extern bfd_boolean _bfd_elf_init_private_section_data 1854 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *); 1855 extern bfd_boolean _bfd_elf_copy_private_section_data 1856 (bfd *, asection *, bfd *, asection *); 1857 extern bfd_boolean _bfd_elf_write_object_contents 1858 (bfd *); 1859 extern bfd_boolean _bfd_elf_write_corefile_contents 1860 (bfd *); 1861 extern bfd_boolean _bfd_elf_set_section_contents 1862 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type); 1863 extern long _bfd_elf_get_symtab_upper_bound 1864 (bfd *); 1865 extern long _bfd_elf_canonicalize_symtab 1866 (bfd *, asymbol **); 1867 extern long _bfd_elf_get_dynamic_symtab_upper_bound 1868 (bfd *); 1869 extern long _bfd_elf_canonicalize_dynamic_symtab 1870 (bfd *, asymbol **); 1871 extern long _bfd_elf_get_synthetic_symtab 1872 (bfd *, long, asymbol **, long, asymbol **, asymbol **); 1873 extern long _bfd_elf_get_reloc_upper_bound 1874 (bfd *, sec_ptr); 1875 extern long _bfd_elf_canonicalize_reloc 1876 (bfd *, sec_ptr, arelent **, asymbol **); 1877 extern asection * _bfd_elf_get_dynamic_reloc_section 1878 (bfd *, asection *, bfd_boolean); 1879 extern asection * _bfd_elf_make_dynamic_reloc_section 1880 (asection *, bfd *, unsigned int, bfd *, bfd_boolean); 1881 extern long _bfd_elf_get_dynamic_reloc_upper_bound 1882 (bfd *); 1883 extern long _bfd_elf_canonicalize_dynamic_reloc 1884 (bfd *, arelent **, asymbol **); 1885 extern asymbol *_bfd_elf_make_empty_symbol 1886 (bfd *); 1887 extern void _bfd_elf_get_symbol_info 1888 (bfd *, asymbol *, symbol_info *); 1889 extern bfd_boolean _bfd_elf_is_local_label_name 1890 (bfd *, const char *); 1891 extern alent *_bfd_elf_get_lineno 1892 (bfd *, asymbol *); 1893 extern bfd_boolean _bfd_elf_set_arch_mach 1894 (bfd *, enum bfd_architecture, unsigned long); 1895 extern bfd_boolean _bfd_elf_find_nearest_line 1896 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **, 1897 unsigned int *); 1898 extern bfd_boolean _bfd_elf_find_nearest_line_discriminator 1899 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **, 1900 unsigned int *, unsigned int *); 1901 extern bfd_boolean _bfd_elf_find_line 1902 (bfd *, asymbol **, asymbol *, const char **, unsigned int *); 1903 extern bfd_boolean _bfd_elf_find_line_discriminator 1904 (bfd *, asymbol **, asymbol *, const char **, unsigned int *, unsigned int *); 1905 #define _bfd_generic_find_line _bfd_elf_find_line 1906 #define _bfd_generic_find_nearest_line_discriminator \ 1907 _bfd_elf_find_nearest_line_discriminator 1908 extern bfd_boolean _bfd_elf_find_inliner_info 1909 (bfd *, const char **, const char **, unsigned int *); 1910 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols 1911 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 1912 extern int _bfd_elf_sizeof_headers 1913 (bfd *, struct bfd_link_info *); 1914 extern bfd_boolean _bfd_elf_new_section_hook 1915 (bfd *, asection *); 1916 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section 1917 (const char *, const struct bfd_elf_special_section *, unsigned int); 1918 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr 1919 (bfd *, asection *); 1920 1921 /* If the target doesn't have reloc handling written yet: */ 1922 extern void _bfd_elf_no_info_to_howto 1923 (bfd *, arelent *, Elf_Internal_Rela *); 1924 1925 extern bfd_boolean bfd_section_from_shdr 1926 (bfd *, unsigned int shindex); 1927 extern bfd_boolean bfd_section_from_phdr 1928 (bfd *, Elf_Internal_Phdr *, int); 1929 1930 extern int _bfd_elf_symbol_from_bfd_symbol 1931 (bfd *, asymbol **); 1932 1933 extern Elf_Internal_Sym *bfd_sym_from_r_symndx 1934 (struct sym_cache *, bfd *, unsigned long); 1935 extern asection *bfd_section_from_elf_index 1936 (bfd *, unsigned int); 1937 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init 1938 (void); 1939 1940 extern struct elf_strtab_hash * _bfd_elf_strtab_init 1941 (void); 1942 extern void _bfd_elf_strtab_free 1943 (struct elf_strtab_hash *); 1944 extern bfd_size_type _bfd_elf_strtab_add 1945 (struct elf_strtab_hash *, const char *, bfd_boolean); 1946 extern void _bfd_elf_strtab_addref 1947 (struct elf_strtab_hash *, bfd_size_type); 1948 extern void _bfd_elf_strtab_delref 1949 (struct elf_strtab_hash *, bfd_size_type); 1950 extern unsigned int _bfd_elf_strtab_refcount 1951 (struct elf_strtab_hash *, bfd_size_type); 1952 extern void _bfd_elf_strtab_clear_all_refs 1953 (struct elf_strtab_hash *tab); 1954 extern void _bfd_elf_strtab_restore_size 1955 (struct elf_strtab_hash *, bfd_size_type); 1956 extern bfd_size_type _bfd_elf_strtab_size 1957 (struct elf_strtab_hash *); 1958 extern bfd_size_type _bfd_elf_strtab_offset 1959 (struct elf_strtab_hash *, bfd_size_type); 1960 extern bfd_boolean _bfd_elf_strtab_emit 1961 (bfd *, struct elf_strtab_hash *); 1962 extern void _bfd_elf_strtab_finalize 1963 (struct elf_strtab_hash *); 1964 1965 extern void _bfd_elf_begin_eh_frame_parsing 1966 (struct bfd_link_info *info); 1967 extern void _bfd_elf_parse_eh_frame 1968 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *); 1969 extern void _bfd_elf_end_eh_frame_parsing 1970 (struct bfd_link_info *info); 1971 1972 extern bfd_boolean _bfd_elf_discard_section_eh_frame 1973 (bfd *, struct bfd_link_info *, asection *, 1974 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *); 1975 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr 1976 (bfd *, struct bfd_link_info *); 1977 extern bfd_vma _bfd_elf_eh_frame_section_offset 1978 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1979 extern bfd_boolean _bfd_elf_write_section_eh_frame 1980 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 1981 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr 1982 (bfd *, struct bfd_link_info *); 1983 extern bfd_boolean _bfd_elf_eh_frame_present 1984 (struct bfd_link_info *); 1985 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr 1986 (struct bfd_link_info *); 1987 1988 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *); 1989 1990 extern long _bfd_elf_link_lookup_local_dynindx 1991 (struct bfd_link_info *, bfd *, long); 1992 extern bfd_boolean _bfd_elf_compute_section_file_positions 1993 (bfd *, struct bfd_link_info *); 1994 extern void _bfd_elf_assign_file_positions_for_relocs 1995 (bfd *); 1996 extern file_ptr _bfd_elf_assign_file_position_for_section 1997 (Elf_Internal_Shdr *, file_ptr, bfd_boolean); 1998 1999 extern bfd_boolean _bfd_elf_validate_reloc 2000 (bfd *, arelent *); 2001 2002 extern bfd_boolean _bfd_elf_link_create_dynamic_sections 2003 (bfd *, struct bfd_link_info *); 2004 extern bfd_boolean _bfd_elf_link_omit_section_dynsym 2005 (bfd *, struct bfd_link_info *, asection *); 2006 extern bfd_boolean _bfd_elf_create_dynamic_sections 2007 (bfd *, struct bfd_link_info *); 2008 extern bfd_boolean _bfd_elf_create_got_section 2009 (bfd *, struct bfd_link_info *); 2010 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym 2011 (bfd *, struct bfd_link_info *, asection *, const char *); 2012 extern void _bfd_elf_init_1_index_section 2013 (bfd *, struct bfd_link_info *); 2014 extern void _bfd_elf_init_2_index_sections 2015 (bfd *, struct bfd_link_info *); 2016 2017 extern bfd_boolean _bfd_elfcore_make_pseudosection 2018 (bfd *, char *, size_t, ufile_ptr); 2019 extern char *_bfd_elfcore_strndup 2020 (bfd *, char *, size_t); 2021 2022 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs 2023 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean); 2024 2025 extern bfd_boolean _bfd_elf_link_output_relocs 2026 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 2027 struct elf_link_hash_entry **); 2028 2029 extern bfd_boolean _bfd_elf_adjust_dynamic_copy 2030 (struct elf_link_hash_entry *, asection *); 2031 2032 extern bfd_boolean _bfd_elf_dynamic_symbol_p 2033 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2034 2035 extern bfd_boolean _bfd_elf_symbol_refs_local_p 2036 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2037 2038 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation 2039 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma); 2040 2041 extern bfd_boolean _bfd_elf_setup_sections 2042 (bfd *); 2043 2044 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *); 2045 2046 extern const bfd_target *bfd_elf32_object_p 2047 (bfd *); 2048 extern const bfd_target *bfd_elf32_core_file_p 2049 (bfd *); 2050 extern char *bfd_elf32_core_file_failing_command 2051 (bfd *); 2052 extern int bfd_elf32_core_file_failing_signal 2053 (bfd *); 2054 extern bfd_boolean bfd_elf32_core_file_matches_executable_p 2055 (bfd *, bfd *); 2056 extern int bfd_elf32_core_file_pid 2057 (bfd *); 2058 2059 extern bfd_boolean bfd_elf32_swap_symbol_in 2060 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2061 extern void bfd_elf32_swap_symbol_out 2062 (bfd *, const Elf_Internal_Sym *, void *, void *); 2063 extern void bfd_elf32_swap_reloc_in 2064 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2065 extern void bfd_elf32_swap_reloc_out 2066 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2067 extern void bfd_elf32_swap_reloca_in 2068 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2069 extern void bfd_elf32_swap_reloca_out 2070 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2071 extern void bfd_elf32_swap_phdr_in 2072 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *); 2073 extern void bfd_elf32_swap_phdr_out 2074 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *); 2075 extern void bfd_elf32_swap_dyn_in 2076 (bfd *, const void *, Elf_Internal_Dyn *); 2077 extern void bfd_elf32_swap_dyn_out 2078 (bfd *, const Elf_Internal_Dyn *, void *); 2079 extern long bfd_elf32_slurp_symbol_table 2080 (bfd *, asymbol **, bfd_boolean); 2081 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr 2082 (bfd *); 2083 extern int bfd_elf32_write_out_phdrs 2084 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2085 extern bfd_boolean bfd_elf32_checksum_contents 2086 (bfd * , void (*) (const void *, size_t, void *), void *); 2087 extern void bfd_elf32_write_relocs 2088 (bfd *, asection *, void *); 2089 extern bfd_boolean bfd_elf32_slurp_reloc_table 2090 (bfd *, asection *, asymbol **, bfd_boolean); 2091 2092 extern const bfd_target *bfd_elf64_object_p 2093 (bfd *); 2094 extern const bfd_target *bfd_elf64_core_file_p 2095 (bfd *); 2096 extern char *bfd_elf64_core_file_failing_command 2097 (bfd *); 2098 extern int bfd_elf64_core_file_failing_signal 2099 (bfd *); 2100 extern bfd_boolean bfd_elf64_core_file_matches_executable_p 2101 (bfd *, bfd *); 2102 extern int bfd_elf64_core_file_pid 2103 (bfd *); 2104 2105 extern bfd_boolean bfd_elf64_swap_symbol_in 2106 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2107 extern void bfd_elf64_swap_symbol_out 2108 (bfd *, const Elf_Internal_Sym *, void *, void *); 2109 extern void bfd_elf64_swap_reloc_in 2110 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2111 extern void bfd_elf64_swap_reloc_out 2112 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2113 extern void bfd_elf64_swap_reloca_in 2114 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2115 extern void bfd_elf64_swap_reloca_out 2116 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2117 extern void bfd_elf64_swap_phdr_in 2118 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *); 2119 extern void bfd_elf64_swap_phdr_out 2120 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *); 2121 extern void bfd_elf64_swap_dyn_in 2122 (bfd *, const void *, Elf_Internal_Dyn *); 2123 extern void bfd_elf64_swap_dyn_out 2124 (bfd *, const Elf_Internal_Dyn *, void *); 2125 extern long bfd_elf64_slurp_symbol_table 2126 (bfd *, asymbol **, bfd_boolean); 2127 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr 2128 (bfd *); 2129 extern int bfd_elf64_write_out_phdrs 2130 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2131 extern bfd_boolean bfd_elf64_checksum_contents 2132 (bfd * , void (*) (const void *, size_t, void *), void *); 2133 extern void bfd_elf64_write_relocs 2134 (bfd *, asection *, void *); 2135 extern bfd_boolean bfd_elf64_slurp_reloc_table 2136 (bfd *, asection *, asymbol **, bfd_boolean); 2137 2138 extern bfd_boolean _bfd_elf_default_relocs_compatible 2139 (const bfd_target *, const bfd_target *); 2140 2141 extern bfd_boolean _bfd_elf_relocs_compatible 2142 (const bfd_target *, const bfd_target *); 2143 extern bfd_boolean _bfd_elf_notice_as_needed 2144 (bfd *, struct bfd_link_info *, enum notice_asneeded_action); 2145 2146 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup 2147 (bfd *, struct bfd_link_info *, const char *); 2148 extern bfd_boolean bfd_elf_link_add_symbols 2149 (bfd *, struct bfd_link_info *); 2150 extern bfd_boolean _bfd_elf_add_dynamic_entry 2151 (struct bfd_link_info *, bfd_vma, bfd_vma); 2152 2153 extern bfd_boolean bfd_elf_link_record_dynamic_symbol 2154 (struct bfd_link_info *, struct elf_link_hash_entry *); 2155 2156 extern int bfd_elf_link_record_local_dynamic_symbol 2157 (struct bfd_link_info *, bfd *, long); 2158 2159 extern bfd_boolean _bfd_elf_close_and_cleanup 2160 (bfd *); 2161 2162 extern bfd_boolean _bfd_elf_common_definition 2163 (Elf_Internal_Sym *); 2164 2165 extern unsigned int _bfd_elf_common_section_index 2166 (asection *); 2167 2168 extern asection *_bfd_elf_common_section 2169 (asection *); 2170 2171 extern bfd_vma _bfd_elf_default_got_elt_size 2172 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *, 2173 unsigned long); 2174 2175 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn 2176 (bfd *, arelent *, struct bfd_symbol *, void *, 2177 asection *, bfd *, char **); 2178 2179 extern bfd_boolean bfd_elf_final_link 2180 (bfd *, struct bfd_link_info *); 2181 2182 extern void _bfd_elf_gc_keep 2183 (struct bfd_link_info *info); 2184 2185 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol 2186 (struct elf_link_hash_entry *h, void *inf); 2187 2188 extern bfd_boolean bfd_elf_gc_sections 2189 (bfd *, struct bfd_link_info *); 2190 2191 extern bfd_boolean bfd_elf_gc_record_vtinherit 2192 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2193 2194 extern bfd_boolean bfd_elf_gc_record_vtentry 2195 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2196 2197 extern asection *_bfd_elf_gc_mark_hook 2198 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 2199 struct elf_link_hash_entry *, Elf_Internal_Sym *); 2200 2201 extern asection *_bfd_elf_gc_mark_rsec 2202 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2203 struct elf_reloc_cookie *); 2204 2205 extern bfd_boolean _bfd_elf_gc_mark_reloc 2206 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2207 struct elf_reloc_cookie *); 2208 2209 extern bfd_boolean _bfd_elf_gc_mark_fdes 2210 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn, 2211 struct elf_reloc_cookie *); 2212 2213 extern bfd_boolean _bfd_elf_gc_mark 2214 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn); 2215 2216 extern bfd_boolean _bfd_elf_gc_mark_extra_sections 2217 (struct bfd_link_info *, elf_gc_mark_hook_fn); 2218 2219 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets 2220 (bfd *, struct bfd_link_info *); 2221 2222 extern bfd_boolean bfd_elf_gc_common_final_link 2223 (bfd *, struct bfd_link_info *); 2224 2225 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p 2226 (bfd_vma, void *); 2227 2228 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment 2229 (bfd *, asection *); 2230 2231 extern bfd_boolean _bfd_elf_map_sections_to_segments 2232 (bfd *, struct bfd_link_info *); 2233 2234 extern bfd_boolean _bfd_elf_is_function_type (unsigned int); 2235 2236 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *, 2237 bfd_vma *); 2238 2239 extern int bfd_elf_get_default_section_type (flagword); 2240 2241 extern bfd_boolean bfd_elf_lookup_section_flags 2242 (struct bfd_link_info *, struct flag_info *, asection *); 2243 2244 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section 2245 (bfd * abfd, asection * section); 2246 2247 /* Exported interface for writing elf corefile notes. */ 2248 extern char *elfcore_write_note 2249 (bfd *, char *, int *, const char *, int, const void *, int); 2250 extern char *elfcore_write_prpsinfo 2251 (bfd *, char *, int *, const char *, const char *); 2252 extern char *elfcore_write_prstatus 2253 (bfd *, char *, int *, long, int, const void *); 2254 extern char * elfcore_write_pstatus 2255 (bfd *, char *, int *, long, int, const void *); 2256 extern char *elfcore_write_prfpreg 2257 (bfd *, char *, int *, const void *, int); 2258 extern char *elfcore_write_prxfpreg 2259 (bfd *, char *, int *, const void *, int); 2260 extern char *elfcore_write_xstatereg 2261 (bfd *, char *, int *, const void *, int); 2262 extern char *elfcore_write_ppc_vmx 2263 (bfd *, char *, int *, const void *, int); 2264 extern char *elfcore_write_ppc_vsx 2265 (bfd *, char *, int *, const void *, int); 2266 extern char *elfcore_write_s390_timer 2267 (bfd *, char *, int *, const void *, int); 2268 extern char *elfcore_write_s390_todcmp 2269 (bfd *, char *, int *, const void *, int); 2270 extern char *elfcore_write_s390_todpreg 2271 (bfd *, char *, int *, const void *, int); 2272 extern char *elfcore_write_s390_ctrs 2273 (bfd *, char *, int *, const void *, int); 2274 extern char *elfcore_write_s390_prefix 2275 (bfd *, char *, int *, const void *, int); 2276 extern char *elfcore_write_s390_last_break 2277 (bfd *, char *, int *, const void *, int); 2278 extern char *elfcore_write_s390_system_call 2279 (bfd *, char *, int *, const void *, int); 2280 extern char *elfcore_write_s390_tdb 2281 (bfd *, char *, int *, const void *, int); 2282 extern char *elfcore_write_arm_vfp 2283 (bfd *, char *, int *, const void *, int); 2284 extern char *elfcore_write_aarch_tls 2285 (bfd *, char *, int *, const void *, int); 2286 extern char *elfcore_write_aarch_hw_break 2287 (bfd *, char *, int *, const void *, int); 2288 extern char *elfcore_write_aarch_hw_watch 2289 (bfd *, char *, int *, const void *, int); 2290 extern char *elfcore_write_lwpstatus 2291 (bfd *, char *, int *, long, int, const void *); 2292 extern char *elfcore_write_register_note 2293 (bfd *, char *, int *, const char *, const void *, int); 2294 2295 /* Internal structure which holds information to be included in the 2296 PRPSINFO section of Linux core files. 2297 2298 This is an "internal" structure in the sense that it should be used 2299 to pass information to BFD (via the `elfcore_write_linux_prpsinfo' 2300 function), so things like endianess shouldn't be an issue. This 2301 structure will eventually be converted in one of the 2302 `elf_external_linux_*' structures and written out to an output bfd 2303 by one of the functions declared below. */ 2304 2305 struct elf_internal_linux_prpsinfo 2306 { 2307 char pr_state; /* Numeric process state. */ 2308 char pr_sname; /* Char for pr_state. */ 2309 char pr_zomb; /* Zombie. */ 2310 char pr_nice; /* Nice val. */ 2311 unsigned long pr_flag; /* Flags. */ 2312 unsigned int pr_uid; 2313 unsigned int pr_gid; 2314 int pr_pid, pr_ppid, pr_pgrp, pr_sid; 2315 char pr_fname[16 + 1]; /* Filename of executable. */ 2316 char pr_psargs[80 + 1]; /* Initial part of arg list. */ 2317 }; 2318 2319 /* Linux/most 32-bit archs. */ 2320 extern char *elfcore_write_linux_prpsinfo32 2321 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2322 2323 /* Linux/most 64-bit archs. */ 2324 extern char *elfcore_write_linux_prpsinfo64 2325 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2326 2327 /* Linux/PPC32 uses different layout compared to most archs. */ 2328 extern char *elfcore_write_ppc_linux_prpsinfo32 2329 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2330 2331 extern bfd *_bfd_elf32_bfd_from_remote_memory 2332 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep, 2333 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2334 extern bfd *_bfd_elf64_bfd_from_remote_memory 2335 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep, 2336 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2337 2338 extern bfd_vma bfd_elf_obj_attr_size (bfd *); 2339 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma); 2340 extern int bfd_elf_get_obj_attr_int (bfd *, int, int); 2341 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int); 2342 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \ 2343 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2344 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *); 2345 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \ 2346 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2347 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int, 2348 const char *); 2349 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \ 2350 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \ 2351 (INTVAL), (STRVAL)) 2352 2353 extern char *_bfd_elf_attr_strdup (bfd *, const char *); 2354 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *); 2355 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int); 2356 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *); 2357 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *); 2358 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int); 2359 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *); 2360 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec); 2361 2362 /* The linker may need to keep track of the number of relocs that it 2363 decides to copy as dynamic relocs in check_relocs for each symbol. 2364 This is so that it can later discard them if they are found to be 2365 unnecessary. We can store the information in a field extending the 2366 regular ELF linker hash table. */ 2367 2368 struct elf_dyn_relocs 2369 { 2370 struct elf_dyn_relocs *next; 2371 2372 /* The input section of the reloc. */ 2373 asection *sec; 2374 2375 /* Total number of relocs copied for the input section. */ 2376 bfd_size_type count; 2377 2378 /* Number of pc-relative relocs copied for the input section. */ 2379 bfd_size_type pc_count; 2380 }; 2381 2382 extern bfd_boolean _bfd_elf_create_ifunc_sections 2383 (bfd *, struct bfd_link_info *); 2384 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs 2385 (struct bfd_link_info *, struct elf_link_hash_entry *, 2386 struct elf_dyn_relocs **, unsigned int, unsigned int, unsigned int); 2387 2388 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *); 2389 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *); 2390 2391 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma); 2392 extern bfd_vma elf64_r_sym (bfd_vma); 2393 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma); 2394 extern bfd_vma elf32_r_sym (bfd_vma); 2395 2396 /* Large common section. */ 2397 extern asection _bfd_elf_large_com_section; 2398 2399 /* Hash for local symbol with the first section id, ID, in the input 2400 file and the local symbol index, SYM. */ 2401 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \ 2402 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \ 2403 ^ (SYM) ^ ((ID) >> 16)) 2404 2405 /* This is the condition under which finish_dynamic_symbol will be called. 2406 If our finish_dynamic_symbol isn't called, we'll need to do something 2407 about initializing any .plt and .got entries in relocate_section. */ 2408 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \ 2409 ((DYN) \ 2410 && ((SHARED) || !(H)->forced_local) \ 2411 && ((H)->dynindx != -1 || (H)->forced_local)) 2412 2413 /* This macro is to avoid lots of duplicated code in the body 2414 of xxx_relocate_section() in the various elfxx-xxxx.c files. */ 2415 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \ 2416 r_symndx, symtab_hdr, sym_hashes, \ 2417 h, sec, relocation, \ 2418 unresolved_reloc, warned, ignored) \ 2419 do \ 2420 { \ 2421 /* It seems this can happen with erroneous or unsupported \ 2422 input (mixing a.out and elf in an archive, for example.) */ \ 2423 if (sym_hashes == NULL) \ 2424 return FALSE; \ 2425 \ 2426 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \ 2427 \ 2428 while (h->root.type == bfd_link_hash_indirect \ 2429 || h->root.type == bfd_link_hash_warning) \ 2430 h = (struct elf_link_hash_entry *) h->root.u.i.link; \ 2431 \ 2432 warned = FALSE; \ 2433 ignored = FALSE; \ 2434 unresolved_reloc = FALSE; \ 2435 relocation = 0; \ 2436 if (h->root.type == bfd_link_hash_defined \ 2437 || h->root.type == bfd_link_hash_defweak) \ 2438 { \ 2439 sec = h->root.u.def.section; \ 2440 if (sec == NULL \ 2441 || sec->output_section == NULL) \ 2442 /* Set a flag that will be cleared later if we find a \ 2443 relocation value for this symbol. output_section \ 2444 is typically NULL for symbols satisfied by a shared \ 2445 library. */ \ 2446 unresolved_reloc = TRUE; \ 2447 else \ 2448 relocation = (h->root.u.def.value \ 2449 + sec->output_section->vma \ 2450 + sec->output_offset); \ 2451 } \ 2452 else if (h->root.type == bfd_link_hash_undefweak) \ 2453 ; \ 2454 else if (info->unresolved_syms_in_objects == RM_IGNORE \ 2455 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \ 2456 ignored = TRUE; \ 2457 else if (!info->relocatable) \ 2458 { \ 2459 bfd_boolean err; \ 2460 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \ 2461 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \ 2462 if (!info->callbacks->undefined_symbol (info, \ 2463 h->root.root.string, \ 2464 input_bfd, \ 2465 input_section, \ 2466 rel->r_offset, err)) \ 2467 return FALSE; \ 2468 warned = TRUE; \ 2469 } \ 2470 (void) unresolved_reloc; \ 2471 (void) warned; \ 2472 (void) ignored; \ 2473 } \ 2474 while (0) 2475 2476 /* This macro is to avoid lots of duplicated code in the body of the 2477 loop over relocations in xxx_relocate_section() in the various 2478 elfxx-xxxx.c files. 2479 2480 Handle relocations against symbols from removed linkonce sections, 2481 or sections discarded by a linker script. When doing a relocatable 2482 link, we remove such relocations. Otherwise, we just want the 2483 section contents zeroed and avoid any special processing. */ 2484 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \ 2485 rel, count, relend, \ 2486 howto, index, contents) \ 2487 { \ 2488 int i_; \ 2489 _bfd_clear_contents (howto, input_bfd, input_section, \ 2490 contents + rel[index].r_offset); \ 2491 \ 2492 if (info->relocatable \ 2493 && (input_section->flags & SEC_DEBUGGING)) \ 2494 { \ 2495 /* Only remove relocations in debug sections since other \ 2496 sections may require relocations. */ \ 2497 Elf_Internal_Shdr *rel_hdr; \ 2498 \ 2499 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \ 2500 \ 2501 /* Avoid empty output section. */ \ 2502 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \ 2503 { \ 2504 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 2505 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \ 2506 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 2507 \ 2508 memmove (rel, rel + count, \ 2509 (relend - rel - count) * sizeof (*rel)); \ 2510 \ 2511 input_section->reloc_count--; \ 2512 relend -= count; \ 2513 rel--; \ 2514 continue; \ 2515 } \ 2516 } \ 2517 \ 2518 for (i_ = 0; i_ < count; i_++) \ 2519 { \ 2520 rel[i_].r_info = 0; \ 2521 rel[i_].r_addend = 0; \ 2522 } \ 2523 rel += count - 1; \ 2524 continue; \ 2525 } 2526 2527 /* Will a symbol be bound to the definition within the shared 2528 library, if any. A unique symbol can never be bound locally. */ 2529 #define SYMBOLIC_BIND(INFO, H) \ 2530 (!(H)->unique_global \ 2531 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))) 2532 2533 #endif /* _LIBELF_H_ */ 2534