1 /* BFD back-end data structures for ELF files. 2 Copyright (C) 1992-2016 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 #ifdef __cplusplus 31 extern "C" { 32 #endif 33 34 /* The number of entries in a section is its size divided by the size 35 of a single entry. This is normally only applicable to reloc and 36 symbol table sections. 37 PR 9934: It is possible to have relocations that do not refer to 38 symbols, thus it is also possible to have a relocation section in 39 an object file, but no symbol table. */ 40 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0) 41 42 /* If size isn't specified as 64 or 32, NAME macro should fail. */ 43 #ifndef NAME 44 #if ARCH_SIZE == 64 45 #define NAME(x, y) x ## 64 ## _ ## y 46 #endif 47 #if ARCH_SIZE == 32 48 #define NAME(x, y) x ## 32 ## _ ## y 49 #endif 50 #endif 51 52 #ifndef NAME 53 #define NAME(x, y) x ## NOSIZE ## _ ## y 54 #endif 55 56 #define ElfNAME(X) NAME(Elf,X) 57 #define elfNAME(X) NAME(elf,X) 58 59 /* Information held for an ELF symbol. The first field is the 60 corresponding asymbol. Every symbol is an ELF file is actually a 61 pointer to this structure, although it is often handled as a 62 pointer to an asymbol. */ 63 64 typedef struct 65 { 66 /* The BFD symbol. */ 67 asymbol symbol; 68 /* ELF symbol information. */ 69 Elf_Internal_Sym internal_elf_sym; 70 /* Backend specific information. */ 71 union 72 { 73 unsigned int hppa_arg_reloc; 74 void *mips_extr; 75 void *any; 76 } 77 tc_data; 78 79 /* Version information. This is from an Elf_Internal_Versym 80 structure in a SHT_GNU_versym section. It is zero if there is no 81 version information. */ 82 unsigned short version; 83 84 } elf_symbol_type; 85 86 struct elf_strtab_hash; 87 struct got_entry; 88 struct plt_entry; 89 90 union gotplt_union 91 { 92 bfd_signed_vma refcount; 93 bfd_vma offset; 94 struct got_entry *glist; 95 struct plt_entry *plist; 96 }; 97 98 struct elf_link_virtual_table_entry 99 { 100 /* Virtual table entry use information. This array is nominally of size 101 size/sizeof(target_void_pointer), though we have to be able to assume 102 and track a size while the symbol is still undefined. It is indexed 103 via offset/sizeof(target_void_pointer). */ 104 size_t size; 105 bfd_boolean *used; 106 107 /* Virtual table derivation info. */ 108 struct elf_link_hash_entry *parent; 109 }; 110 111 /* ELF symbol version. */ 112 enum elf_symbol_version 113 { 114 unknown = 0, 115 unversioned, 116 versioned, 117 versioned_hidden 118 }; 119 120 /* ELF linker hash table entries. */ 121 122 struct elf_link_hash_entry 123 { 124 struct bfd_link_hash_entry root; 125 126 /* Symbol index in output file. This is initialized to -1. It is 127 set to -2 if the symbol is used by a reloc. It is set to -3 if 128 this symbol is defined in a discarded section. */ 129 long indx; 130 131 /* Symbol index as a dynamic symbol. Initialized to -1, and remains 132 -1 if this is not a dynamic symbol. */ 133 /* ??? Note that this is consistently used as a synonym for tests 134 against whether we can perform various simplifying transformations 135 to the code. (E.g. changing a pc-relative jump to a PLT entry 136 into a pc-relative jump to the target function.) That test, which 137 is often relatively complex, and someplaces wrong or incomplete, 138 should really be replaced by a predicate in elflink.c. 139 140 End result: this field -1 does not indicate that the symbol is 141 not in the dynamic symbol table, but rather that the symbol is 142 not visible outside this DSO. */ 143 long dynindx; 144 145 /* If this symbol requires an entry in the global offset table, the 146 processor specific backend uses this field to track usage and 147 final offset. Two schemes are supported: The first assumes that 148 a symbol may only have one GOT entry, and uses REFCOUNT until 149 size_dynamic_sections, at which point the contents of the .got is 150 fixed. Afterward, if OFFSET is -1, then the symbol does not 151 require a global offset table entry. The second scheme allows 152 multiple GOT entries per symbol, managed via a linked list 153 pointed to by GLIST. */ 154 union gotplt_union got; 155 156 /* Same, but tracks a procedure linkage table entry. */ 157 union gotplt_union plt; 158 159 /* Symbol size. */ 160 bfd_size_type size; 161 162 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */ 163 unsigned int type : 8; 164 165 /* Symbol st_other value, symbol visibility. */ 166 unsigned int other : 8; 167 168 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */ 169 unsigned int target_internal : 8; 170 171 /* Symbol is referenced by a non-shared object (other than the object 172 in which it is defined). */ 173 unsigned int ref_regular : 1; 174 /* Symbol is defined by a non-shared object. */ 175 unsigned int def_regular : 1; 176 /* Symbol is referenced by a shared object. */ 177 unsigned int ref_dynamic : 1; 178 /* Symbol is defined by a shared object. */ 179 unsigned int def_dynamic : 1; 180 /* Symbol has a non-weak reference from a non-shared object (other than 181 the object in which it is defined). */ 182 unsigned int ref_regular_nonweak : 1; 183 /* Dynamic symbol has been adjustd. */ 184 unsigned int dynamic_adjusted : 1; 185 /* Symbol needs a copy reloc. */ 186 unsigned int needs_copy : 1; 187 /* Symbol needs a procedure linkage table entry. */ 188 unsigned int needs_plt : 1; 189 /* Symbol appears in a non-ELF input file. */ 190 unsigned int non_elf : 1; 191 /* Symbol version information. */ 192 ENUM_BITFIELD (elf_symbol_version) versioned : 2; 193 /* Symbol was forced to local scope due to a version script file. */ 194 unsigned int forced_local : 1; 195 /* Symbol was forced to be dynamic due to a version script file. */ 196 unsigned int dynamic : 1; 197 /* Symbol was marked during garbage collection. */ 198 unsigned int mark : 1; 199 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is 200 not currently set by all the backends. */ 201 unsigned int non_got_ref : 1; 202 /* Symbol has a definition in a shared object. 203 FIXME: There is no real need for this field if def_dynamic is never 204 cleared and all places that test def_dynamic also test def_regular. */ 205 unsigned int dynamic_def : 1; 206 /* Symbol has a non-weak reference from a shared object. */ 207 unsigned int ref_dynamic_nonweak : 1; 208 /* Symbol is referenced with a relocation where C/C++ pointer equality 209 matters. */ 210 unsigned int pointer_equality_needed : 1; 211 /* Symbol is a unique global symbol. */ 212 unsigned int unique_global : 1; 213 /* Symbol is defined by a shared library with non-default visibility 214 in a read/write section. */ 215 unsigned int protected_def : 1; 216 217 /* String table index in .dynstr if this is a dynamic symbol. */ 218 unsigned long dynstr_index; 219 220 union 221 { 222 /* If this is a weak defined symbol from a dynamic object, this 223 field points to a defined symbol with the same value, if there is 224 one. Otherwise it is NULL. */ 225 struct elf_link_hash_entry *weakdef; 226 227 /* Hash value of the name computed using the ELF hash function. 228 Used part way through size_dynamic_sections, after we've finished 229 with weakdefs. */ 230 unsigned long elf_hash_value; 231 } u; 232 233 /* Version information. */ 234 union 235 { 236 /* This field is used for a symbol which is not defined in a 237 regular object. It points to the version information read in 238 from the dynamic object. */ 239 Elf_Internal_Verdef *verdef; 240 /* This field is used for a symbol which is defined in a regular 241 object. It is set up in size_dynamic_sections. It points to 242 the version information we should write out for this symbol. */ 243 struct bfd_elf_version_tree *vertree; 244 } verinfo; 245 246 struct elf_link_virtual_table_entry *vtable; 247 }; 248 249 /* Will references to this symbol always reference the symbol 250 in this object? */ 251 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \ 252 _bfd_elf_symbol_refs_local_p (H, INFO, 0) 253 254 /* Will _calls_ to this symbol always call the version in this object? */ 255 #define SYMBOL_CALLS_LOCAL(INFO, H) \ 256 _bfd_elf_symbol_refs_local_p (H, INFO, 1) 257 258 /* Common symbols that are turned into definitions don't have the 259 DEF_REGULAR flag set, so they might appear to be undefined. 260 Symbols defined in linker scripts also don't have DEF_REGULAR set. */ 261 #define ELF_COMMON_DEF_P(H) \ 262 (!(H)->def_regular \ 263 && !(H)->def_dynamic \ 264 && (H)->root.type == bfd_link_hash_defined) 265 266 /* Records local symbols to be emitted in the dynamic symbol table. */ 267 268 struct elf_link_local_dynamic_entry 269 { 270 struct elf_link_local_dynamic_entry *next; 271 272 /* The input bfd this symbol came from. */ 273 bfd *input_bfd; 274 275 /* The index of the local symbol being copied. */ 276 long input_indx; 277 278 /* The index in the outgoing dynamic symbol table. */ 279 long dynindx; 280 281 /* A copy of the input symbol. */ 282 Elf_Internal_Sym isym; 283 }; 284 285 struct elf_link_loaded_list 286 { 287 struct elf_link_loaded_list *next; 288 bfd *abfd; 289 }; 290 291 /* Structures used by the eh_frame optimization code. */ 292 struct eh_cie_fde 293 { 294 union { 295 struct { 296 /* If REMOVED == 1, this is the CIE that the FDE originally used. 297 The CIE belongs to the same .eh_frame input section as the FDE. 298 299 If REMOVED == 0, this is the CIE that we have chosen to use for 300 the output FDE. The CIE's REMOVED field is also 0, but the CIE 301 might belong to a different .eh_frame input section from the FDE. 302 303 May be NULL to signify that the FDE should be discarded. */ 304 struct eh_cie_fde *cie_inf; 305 struct eh_cie_fde *next_for_section; 306 } fde; 307 struct { 308 /* CIEs have three states: 309 310 - REMOVED && !MERGED: Slated for removal because we haven't yet 311 proven that an FDE needs it. FULL_CIE, if nonnull, points to 312 more detailed information about the CIE. 313 314 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH, 315 which may not belong to the same input section. 316 317 - !REMOVED: We have decided to keep this CIE. SEC is the 318 .eh_frame input section that contains the CIE. */ 319 union { 320 struct cie *full_cie; 321 struct eh_cie_fde *merged_with; 322 asection *sec; 323 } u; 324 325 /* The offset of the personality data from the start of the CIE, 326 or 0 if the CIE doesn't have any. */ 327 unsigned int personality_offset : 8; 328 329 /* True if we have marked relocations associated with this CIE. */ 330 unsigned int gc_mark : 1; 331 332 /* True if we have decided to turn an absolute LSDA encoding into 333 a PC-relative one. */ 334 unsigned int make_lsda_relative : 1; 335 336 /* True if we have decided to turn an absolute personality 337 encoding into a PC-relative one. */ 338 unsigned int make_per_encoding_relative : 1; 339 340 /* True if the CIE contains personality data and if that 341 data uses a PC-relative encoding. Always true when 342 make_per_encoding_relative is. */ 343 unsigned int per_encoding_relative : 1; 344 345 /* True if we need to add an 'R' (FDE encoding) entry to the 346 CIE's augmentation data. */ 347 unsigned int add_fde_encoding : 1; 348 349 /* True if we have merged this CIE with another. */ 350 unsigned int merged : 1; 351 352 /* Unused bits. */ 353 unsigned int pad1 : 18; 354 } cie; 355 } u; 356 unsigned int reloc_index; 357 unsigned int size; 358 unsigned int offset; 359 unsigned int new_offset; 360 unsigned int fde_encoding : 8; 361 unsigned int lsda_encoding : 8; 362 unsigned int lsda_offset : 8; 363 364 /* True if this entry represents a CIE, false if it represents an FDE. */ 365 unsigned int cie : 1; 366 367 /* True if this entry is currently marked for removal. */ 368 unsigned int removed : 1; 369 370 /* True if we need to add a 'z' (augmentation size) entry to the CIE's 371 augmentation data, and an associated byte to each of the CIE's FDEs. */ 372 unsigned int add_augmentation_size : 1; 373 374 /* True if we have decided to convert absolute FDE relocations into 375 relative ones. This applies to the first relocation in the FDE, 376 which is against the code that the FDE describes. */ 377 unsigned int make_relative : 1; 378 379 /* Unused bits. */ 380 unsigned int pad1 : 4; 381 382 unsigned int *set_loc; 383 }; 384 385 struct eh_frame_sec_info 386 { 387 unsigned int count; 388 struct cie *cies; 389 struct eh_cie_fde entry[1]; 390 }; 391 392 struct eh_frame_array_ent 393 { 394 bfd_vma initial_loc; 395 bfd_size_type range; 396 bfd_vma fde; 397 }; 398 399 struct htab; 400 401 #define DWARF2_EH_HDR 1 402 #define COMPACT_EH_HDR 2 403 404 /* Endian-neutral code indicating that a function cannot be unwound. */ 405 #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01 406 407 struct dwarf_eh_frame_hdr_info 408 { 409 struct htab *cies; 410 unsigned int fde_count; 411 /* TRUE if .eh_frame_hdr should contain the sorted search table. 412 We build it if we successfully read all .eh_frame input sections 413 and recognize them. */ 414 bfd_boolean table; 415 struct eh_frame_array_ent *array; 416 }; 417 418 struct compact_eh_frame_hdr_info 419 { 420 unsigned int allocated_entries; 421 /* eh_frame_entry fragments. */ 422 asection **entries; 423 }; 424 425 struct eh_frame_hdr_info 426 { 427 asection *hdr_sec; 428 unsigned int array_count; 429 bfd_boolean frame_hdr_is_compact; 430 union 431 { 432 struct dwarf_eh_frame_hdr_info dwarf; 433 struct compact_eh_frame_hdr_info compact; 434 } 435 u; 436 }; 437 438 /* Enum used to identify target specific extensions to the elf_obj_tdata 439 and elf_link_hash_table structures. Note the enums deliberately start 440 from 1 so that we can detect an uninitialized field. The generic value 441 is last so that additions to this enum do not need to modify more than 442 one line. */ 443 enum elf_target_id 444 { 445 AARCH64_ELF_DATA = 1, 446 ALPHA_ELF_DATA, 447 ARM_ELF_DATA, 448 AVR_ELF_DATA, 449 BFIN_ELF_DATA, 450 CRIS_ELF_DATA, 451 FRV_ELF_DATA, 452 HPPA32_ELF_DATA, 453 HPPA64_ELF_DATA, 454 I386_ELF_DATA, 455 IA64_ELF_DATA, 456 LM32_ELF_DATA, 457 M32R_ELF_DATA, 458 M68HC11_ELF_DATA, 459 M68K_ELF_DATA, 460 METAG_ELF_DATA, 461 MICROBLAZE_ELF_DATA, 462 MIPS_ELF_DATA, 463 MN10300_ELF_DATA, 464 NDS32_ELF_DATA, 465 NIOS2_ELF_DATA, 466 OR1K_ELF_DATA, 467 PPC32_ELF_DATA, 468 PPC64_ELF_DATA, 469 S390_ELF_DATA, 470 SH_ELF_DATA, 471 SPARC_ELF_DATA, 472 SPU_ELF_DATA, 473 TIC6X_ELF_DATA, 474 X86_64_ELF_DATA, 475 XTENSA_ELF_DATA, 476 XGATE_ELF_DATA, 477 TILEGX_ELF_DATA, 478 TILEPRO_ELF_DATA, 479 GENERIC_ELF_DATA 480 }; 481 482 struct elf_sym_strtab 483 { 484 Elf_Internal_Sym sym; 485 unsigned long dest_index; 486 unsigned long destshndx_index; 487 }; 488 489 /* ELF linker hash table. */ 490 491 struct elf_link_hash_table 492 { 493 struct bfd_link_hash_table root; 494 495 /* An identifier used to distinguish different target 496 specific extensions to this structure. */ 497 enum elf_target_id hash_table_id; 498 499 /* Whether we have created the special dynamic sections required 500 when linking against or generating a shared object. */ 501 bfd_boolean dynamic_sections_created; 502 503 /* True if this target has relocatable executables, so needs dynamic 504 section symbols. */ 505 bfd_boolean is_relocatable_executable; 506 507 /* The BFD used to hold special sections created by the linker. 508 This will be the first BFD found which requires these sections to 509 be created. */ 510 bfd *dynobj; 511 512 /* The value to use when initialising got.refcount/offset and 513 plt.refcount/offset in an elf_link_hash_entry. Set to zero when 514 the values are refcounts. Set to init_got_offset/init_plt_offset 515 in size_dynamic_sections when the values may be offsets. */ 516 union gotplt_union init_got_refcount; 517 union gotplt_union init_plt_refcount; 518 519 /* The value to use for got.refcount/offset and plt.refcount/offset 520 when the values may be offsets. Normally (bfd_vma) -1. */ 521 union gotplt_union init_got_offset; 522 union gotplt_union init_plt_offset; 523 524 /* The number of symbols found in the link which is intended for the 525 mandatory DT_SYMTAB tag (.dynsym section) in .dynamic section. */ 526 bfd_size_type dynsymcount; 527 528 /* The string table of dynamic symbols, which becomes the .dynstr 529 section. */ 530 struct elf_strtab_hash *dynstr; 531 532 /* The number of symbol strings found in the link which must be put 533 into the .strtab section. */ 534 bfd_size_type strtabcount; 535 536 /* The array size of the symbol string table, which becomes the 537 .strtab section. */ 538 bfd_size_type strtabsize; 539 540 /* The array of strings, which becomes the .strtab section. */ 541 struct elf_sym_strtab *strtab; 542 543 /* The number of buckets in the hash table in the .hash section. 544 This is based on the number of dynamic symbols. */ 545 bfd_size_type bucketcount; 546 547 /* A linked list of DT_NEEDED names found in dynamic objects 548 included in the link. */ 549 struct bfd_link_needed_list *needed; 550 551 /* Sections in the output bfd that provides a section symbol 552 to be used by relocations emitted against local symbols. 553 Most targets will not use data_index_section. */ 554 asection *text_index_section; 555 asection *data_index_section; 556 557 /* The _GLOBAL_OFFSET_TABLE_ symbol. */ 558 struct elf_link_hash_entry *hgot; 559 560 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */ 561 struct elf_link_hash_entry *hplt; 562 563 /* The _DYNAMIC symbol. */ 564 struct elf_link_hash_entry *hdynamic; 565 566 /* A pointer to information used to merge SEC_MERGE sections. */ 567 void *merge_info; 568 569 /* Used to link stabs in sections. */ 570 struct stab_info stab_info; 571 572 /* Used by eh_frame code when editing .eh_frame. */ 573 struct eh_frame_hdr_info eh_info; 574 575 /* A linked list of local symbols to be added to .dynsym. */ 576 struct elf_link_local_dynamic_entry *dynlocal; 577 578 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic 579 objects included in the link. */ 580 struct bfd_link_needed_list *runpath; 581 582 /* Cached first output tls section and size of PT_TLS segment. */ 583 asection *tls_sec; 584 bfd_size_type tls_size; 585 586 /* A linked list of BFD's loaded in the link. */ 587 struct elf_link_loaded_list *loaded; 588 589 /* Short-cuts to get to dynamic linker sections. */ 590 asection *sgot; 591 asection *sgotplt; 592 asection *srelgot; 593 asection *splt; 594 asection *srelplt; 595 asection *igotplt; 596 asection *iplt; 597 asection *irelplt; 598 asection *irelifunc; 599 asection *dynsym; 600 }; 601 602 /* Look up an entry in an ELF linker hash table. */ 603 604 #define elf_link_hash_lookup(table, string, create, copy, follow) \ 605 ((struct elf_link_hash_entry *) \ 606 bfd_link_hash_lookup (&(table)->root, (string), (create), \ 607 (copy), (follow))) 608 609 /* Traverse an ELF linker hash table. */ 610 611 #define elf_link_hash_traverse(table, func, info) \ 612 (bfd_link_hash_traverse \ 613 (&(table)->root, \ 614 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ 615 (info))) 616 617 /* Get the ELF linker hash table from a link_info structure. */ 618 619 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash)) 620 621 #define elf_hash_table_id(table) ((table) -> hash_table_id) 622 623 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */ 624 #define is_elf_hash_table(htab) \ 625 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table) 626 627 /* Used by bfd_sym_from_r_symndx to cache a small number of local 628 symbols. */ 629 #define LOCAL_SYM_CACHE_SIZE 32 630 struct sym_cache 631 { 632 bfd *abfd; 633 unsigned long indx[LOCAL_SYM_CACHE_SIZE]; 634 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE]; 635 }; 636 637 /* Constant information held for an ELF backend. */ 638 639 struct elf_size_info { 640 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr; 641 unsigned char sizeof_rel, sizeof_rela, sizeof_relr, sizeof_sym, sizeof_dyn, sizeof_note; 642 643 /* The size of entries in the .hash section. */ 644 unsigned char sizeof_hash_entry; 645 646 /* The number of internal relocations to allocate per external 647 relocation entry. */ 648 unsigned char int_rels_per_ext_rel; 649 /* We use some fixed size arrays. This should be large enough to 650 handle all back-ends. */ 651 #define MAX_INT_RELS_PER_EXT_REL 3 652 653 unsigned char arch_size, log_file_align; 654 unsigned char elfclass, ev_current; 655 int (*write_out_phdrs) 656 (bfd *, const Elf_Internal_Phdr *, unsigned int); 657 bfd_boolean 658 (*write_shdrs_and_ehdr) (bfd *); 659 bfd_boolean (*checksum_contents) 660 (bfd * , void (*) (const void *, size_t, void *), void *); 661 void (*write_relocs) 662 (bfd *, asection *, void *); 663 bfd_boolean (*swap_symbol_in) 664 (bfd *, const void *, const void *, Elf_Internal_Sym *); 665 void (*swap_symbol_out) 666 (bfd *, const Elf_Internal_Sym *, void *, void *); 667 bfd_boolean (*slurp_reloc_table) 668 (bfd *, asection *, asymbol **, bfd_boolean); 669 long (*slurp_symbol_table) 670 (bfd *, asymbol **, bfd_boolean); 671 void (*swap_dyn_in) 672 (bfd *, const void *, Elf_Internal_Dyn *); 673 void (*swap_dyn_out) 674 (bfd *, const Elf_Internal_Dyn *, void *); 675 676 /* This function is called to swap in a REL relocation. If an 677 external relocation corresponds to more than one internal 678 relocation, then all relocations are swapped in at once. */ 679 void (*swap_reloc_in) 680 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 681 682 /* This function is called to swap out a REL relocation. */ 683 void (*swap_reloc_out) 684 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 685 686 /* This function is called to swap in a RELA relocation. If an 687 external relocation corresponds to more than one internal 688 relocation, then all relocations are swapped in at once. */ 689 void (*swap_reloca_in) 690 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 691 692 /* This function is called to swap out a RELA relocation. */ 693 void (*swap_reloca_out) 694 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 695 }; 696 697 #define elf_symbol_from(ABFD,S) \ 698 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \ 699 && (S)->the_bfd->tdata.elf_obj_data != 0) \ 700 ? (elf_symbol_type *) (S) \ 701 : 0) 702 703 enum elf_reloc_type_class { 704 reloc_class_normal, 705 reloc_class_relative, 706 reloc_class_copy, 707 reloc_class_ifunc, 708 reloc_class_plt 709 }; 710 711 struct elf_reloc_cookie 712 { 713 Elf_Internal_Rela *rels, *rel, *relend; 714 Elf_Internal_Sym *locsyms; 715 bfd *abfd; 716 size_t locsymcount; 717 size_t extsymoff; 718 struct elf_link_hash_entry **sym_hashes; 719 int r_sym_shift; 720 bfd_boolean bad_symtab; 721 }; 722 723 /* The level of IRIX compatibility we're striving for. */ 724 725 typedef enum { 726 ict_none, 727 ict_irix5, 728 ict_irix6 729 } irix_compat_t; 730 731 /* Mapping of ELF section names and types. */ 732 struct bfd_elf_special_section 733 { 734 const char *prefix; 735 unsigned int prefix_length; 736 /* 0 means name must match PREFIX exactly. 737 -1 means name must start with PREFIX followed by an arbitrary string. 738 -2 means name must match PREFIX exactly or consist of PREFIX followed 739 by a dot then anything. 740 > 0 means name must start with the first PREFIX_LENGTH chars of 741 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */ 742 signed int suffix_length; 743 unsigned int type; 744 bfd_vma attr; 745 }; 746 747 enum action_discarded 748 { 749 COMPLAIN = 1, 750 PRETEND = 2 751 }; 752 753 typedef asection * (*elf_gc_mark_hook_fn) 754 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 755 struct elf_link_hash_entry *, Elf_Internal_Sym *); 756 757 struct elf_backend_data 758 { 759 /* The architecture for this backend. */ 760 enum bfd_architecture arch; 761 762 /* An identifier used to distinguish different target specific 763 extensions to elf_obj_tdata and elf_link_hash_table structures. */ 764 enum elf_target_id target_id; 765 766 /* The ELF machine code (EM_xxxx) for this backend. */ 767 int elf_machine_code; 768 769 /* EI_OSABI. */ 770 int elf_osabi; 771 772 /* The maximum page size for this backend. */ 773 bfd_vma maxpagesize; 774 775 /* The minimum page size for this backend. An input object will not be 776 considered page aligned unless its sections are correctly aligned for 777 pages at least this large. May be smaller than maxpagesize. */ 778 bfd_vma minpagesize; 779 780 /* The common page size for this backend. */ 781 bfd_vma commonpagesize; 782 783 /* The BFD flags applied to sections created for dynamic linking. */ 784 flagword dynamic_sec_flags; 785 786 /* Architecture-specific data for this backend. 787 This is actually a pointer to some type like struct elf_ARCH_data. */ 788 const void *arch_data; 789 790 /* A function to translate an ELF RELA relocation to a BFD arelent 791 structure. */ 792 void (*elf_info_to_howto) 793 (bfd *, arelent *, Elf_Internal_Rela *); 794 795 /* A function to translate an ELF REL relocation to a BFD arelent 796 structure. */ 797 void (*elf_info_to_howto_rel) 798 (bfd *, arelent *, Elf_Internal_Rela *); 799 800 /* A function to determine whether a symbol is global when 801 partitioning the symbol table into local and global symbols. 802 This should be NULL for most targets, in which case the correct 803 thing will be done. MIPS ELF, at least on the Irix 5, has 804 special requirements. */ 805 bfd_boolean (*elf_backend_sym_is_global) 806 (bfd *, asymbol *); 807 808 /* The remaining functions are hooks which are called only if they 809 are not NULL. */ 810 811 /* A function to permit a backend specific check on whether a 812 particular BFD format is relevant for an object file, and to 813 permit the backend to set any global information it wishes. When 814 this is called elf_elfheader is set, but anything else should be 815 used with caution. If this returns FALSE, the check_format 816 routine will return a bfd_error_wrong_format error. */ 817 bfd_boolean (*elf_backend_object_p) 818 (bfd *); 819 820 /* A function to do additional symbol processing when reading the 821 ELF symbol table. This is where any processor-specific special 822 section indices are handled. */ 823 void (*elf_backend_symbol_processing) 824 (bfd *, asymbol *); 825 826 /* A function to do additional symbol processing after reading the 827 entire ELF symbol table. */ 828 bfd_boolean (*elf_backend_symbol_table_processing) 829 (bfd *, elf_symbol_type *, unsigned int); 830 831 /* A function to set the type of the info field. Processor-specific 832 types should be handled here. */ 833 int (*elf_backend_get_symbol_type) 834 (Elf_Internal_Sym *, int); 835 836 /* A function to return the linker hash table entry of a symbol that 837 might be satisfied by an archive symbol. */ 838 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup) 839 (bfd *, struct bfd_link_info *, const char *); 840 841 /* Return true if local section symbols should have a non-null st_name. 842 NULL implies false. */ 843 bfd_boolean (*elf_backend_name_local_section_symbols) 844 (bfd *); 845 846 /* A function to do additional processing on the ELF section header 847 just before writing it out. This is used to set the flags and 848 type fields for some sections, or to actually write out data for 849 unusual sections. */ 850 bfd_boolean (*elf_backend_section_processing) 851 (bfd *, Elf_Internal_Shdr *); 852 853 /* A function to handle unusual section types when creating BFD 854 sections from ELF sections. */ 855 bfd_boolean (*elf_backend_section_from_shdr) 856 (bfd *, Elf_Internal_Shdr *, const char *, int); 857 858 /* A function to convert machine dependent ELF section header flags to 859 BFD internal section header flags. */ 860 bfd_boolean (*elf_backend_section_flags) 861 (flagword *, const Elf_Internal_Shdr *); 862 863 /* A function that returns a struct containing ELF section flags and 864 type for the given BFD section. */ 865 const struct bfd_elf_special_section * (*get_sec_type_attr) 866 (bfd *, asection *); 867 868 /* A function to handle unusual program segment types when creating BFD 869 sections from ELF program segments. */ 870 bfd_boolean (*elf_backend_section_from_phdr) 871 (bfd *, Elf_Internal_Phdr *, int, const char *); 872 873 /* A function to set up the ELF section header for a BFD section in 874 preparation for writing it out. This is where the flags and type 875 fields are set for unusual sections. */ 876 bfd_boolean (*elf_backend_fake_sections) 877 (bfd *, Elf_Internal_Shdr *, asection *); 878 879 /* A function to get the ELF section index for a BFD section. If 880 this returns TRUE, the section was found. If it is a normal ELF 881 section, *RETVAL should be left unchanged. If it is not a normal 882 ELF section *RETVAL should be set to the SHN_xxxx index. */ 883 bfd_boolean (*elf_backend_section_from_bfd_section) 884 (bfd *, asection *, int *retval); 885 886 /* If this field is not NULL, it is called by the add_symbols phase 887 of a link just before adding a symbol to the global linker hash 888 table. It may modify any of the fields as it wishes. If *NAME 889 is set to NULL, the symbol will be skipped rather than being 890 added to the hash table. This function is responsible for 891 handling all processor dependent symbol bindings and section 892 indices, and must set at least *FLAGS and *SEC for each processor 893 dependent case; failure to do so will cause a link error. */ 894 bfd_boolean (*elf_add_symbol_hook) 895 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *, 896 const char **name, flagword *flags, asection **sec, bfd_vma *value); 897 898 /* If this field is not NULL, it is called by the elf_link_output_sym 899 phase of a link for each symbol which will appear in the object file. 900 On error, this function returns 0. 1 is returned when the symbol 901 should be output, 2 is returned when the symbol should be discarded. */ 902 int (*elf_backend_link_output_symbol_hook) 903 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *, 904 asection *, struct elf_link_hash_entry *); 905 906 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend 907 linker the first time it encounters a dynamic object in the link. 908 This function must create any sections required for dynamic 909 linking. The ABFD argument is a dynamic object. The .interp, 910 .dynamic, .dynsym, .dynstr, and .hash functions have already been 911 created, and this function may modify the section flags if 912 desired. This function will normally create the .got and .plt 913 sections, but different backends have different requirements. */ 914 bfd_boolean (*elf_backend_create_dynamic_sections) 915 (bfd *abfd, struct bfd_link_info *info); 916 917 /* When creating a shared library, determine whether to omit the 918 dynamic symbol for the section. */ 919 bfd_boolean (*elf_backend_omit_section_dynsym) 920 (bfd *output_bfd, struct bfd_link_info *info, asection *osec); 921 922 /* Return TRUE if relocations of targets are compatible to the extent 923 that CHECK_RELOCS will properly process them. PR 4424. */ 924 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *); 925 926 /* The CHECK_RELOCS function is called by the add_symbols phase of 927 the ELF backend linker. It is called once for each section with 928 relocs of an object file, just after the symbols for the object 929 file have been added to the global linker hash table. The 930 function must look through the relocs and do any special handling 931 required. This generally means allocating space in the global 932 offset table, and perhaps allocating space for a reloc. The 933 relocs are always passed as Rela structures; if the section 934 actually uses Rel structures, the r_addend field will always be 935 zero. */ 936 bfd_boolean (*check_relocs) 937 (bfd *abfd, struct bfd_link_info *info, asection *o, 938 const Elf_Internal_Rela *relocs); 939 940 /* The CHECK_DIRECTIVES function is called once per input file by 941 the add_symbols phase of the ELF backend linker. The function 942 must inspect the bfd and create any additional symbols according 943 to any custom directives in the bfd. */ 944 bfd_boolean (*check_directives) 945 (bfd *abfd, struct bfd_link_info *info); 946 947 /* The NOTICE_AS_NEEDED function is called as the linker is about to 948 handle an as-needed lib (ACT = notice_as_needed), and after the 949 linker has decided to keep the lib (ACT = notice_needed) or when 950 the lib is not needed (ACT = notice_not_needed). */ 951 bfd_boolean (*notice_as_needed) 952 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act); 953 954 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend 955 linker for every symbol which is defined by a dynamic object and 956 referenced by a regular object. This is called after all the 957 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS 958 function has been called. The hash table entry should be 959 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be 960 defined in a section from a dynamic object. Dynamic object 961 sections are not included in the final link, and this function is 962 responsible for changing the value to something which the rest of 963 the link can deal with. This will normally involve adding an 964 entry to the .plt or .got or some such section, and setting the 965 symbol to point to that. */ 966 bfd_boolean (*elf_backend_adjust_dynamic_symbol) 967 (struct bfd_link_info *info, struct elf_link_hash_entry *h); 968 969 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker 970 after all the linker input files have been seen but before the 971 section sizes have been set. This is called after 972 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */ 973 bfd_boolean (*elf_backend_always_size_sections) 974 (bfd *output_bfd, struct bfd_link_info *info); 975 976 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend 977 linker after all the linker input files have been seen but before 978 the sections sizes have been set. This is called after 979 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols. 980 It is only called when linking against a dynamic object. It must 981 set the sizes of the dynamic sections, and may fill in their 982 contents as well. The generic ELF linker can handle the .dynsym, 983 .dynstr and .hash sections. This function must handle the 984 .interp section and any sections created by the 985 CREATE_DYNAMIC_SECTIONS entry point. */ 986 bfd_boolean (*elf_backend_size_dynamic_sections) 987 (bfd *output_bfd, struct bfd_link_info *info); 988 989 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections 990 we keep to use as a base for relocs and symbols. */ 991 void (*elf_backend_init_index_section) 992 (bfd *output_bfd, struct bfd_link_info *info); 993 994 /* The RELOCATE_SECTION function is called by the ELF backend linker 995 to handle the relocations for a section. 996 997 The relocs are always passed as Rela structures; if the section 998 actually uses Rel structures, the r_addend field will always be 999 zero. 1000 1001 This function is responsible for adjust the section contents as 1002 necessary, and (if using Rela relocs and generating a 1003 relocatable output file) adjusting the reloc addend as 1004 necessary. 1005 1006 This function does not have to worry about setting the reloc 1007 address or the reloc symbol index. 1008 1009 LOCAL_SYMS is a pointer to the swapped in local symbols. 1010 1011 LOCAL_SECTIONS is an array giving the section in the input file 1012 corresponding to the st_shndx field of each local symbol. 1013 1014 The global hash table entry for the global symbols can be found 1015 via elf_sym_hashes (input_bfd). 1016 1017 When generating relocatable output, this function must handle 1018 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 1019 going to be the section symbol corresponding to the output 1020 section, which means that the addend must be adjusted 1021 accordingly. 1022 1023 Returns FALSE on error, TRUE on success, 2 if successful and 1024 relocations should be written for this section. */ 1025 int (*elf_backend_relocate_section) 1026 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd, 1027 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs, 1028 Elf_Internal_Sym *local_syms, asection **local_sections); 1029 1030 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend 1031 linker just before it writes a symbol out to the .dynsym section. 1032 The processor backend may make any required adjustment to the 1033 symbol. It may also take the opportunity to set contents of the 1034 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on 1035 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called 1036 on those symbols which are defined by a dynamic object. */ 1037 bfd_boolean (*elf_backend_finish_dynamic_symbol) 1038 (bfd *output_bfd, struct bfd_link_info *info, 1039 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym); 1040 1041 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend 1042 linker just before it writes all the dynamic sections out to the 1043 output file. The FINISH_DYNAMIC_SYMBOL will have been called on 1044 all dynamic symbols. */ 1045 bfd_boolean (*elf_backend_finish_dynamic_sections) 1046 (bfd *output_bfd, struct bfd_link_info *info); 1047 1048 /* A function to do any beginning processing needed for the ELF file 1049 before building the ELF headers and computing file positions. */ 1050 void (*elf_backend_begin_write_processing) 1051 (bfd *, struct bfd_link_info *); 1052 1053 /* A function to do any final processing needed for the ELF file 1054 before writing it out. The LINKER argument is TRUE if this BFD 1055 was created by the ELF backend linker. */ 1056 void (*elf_backend_final_write_processing) 1057 (bfd *, bfd_boolean linker); 1058 1059 /* This function is called by get_program_header_size. It should 1060 return the number of additional program segments which this BFD 1061 will need. It should return -1 on error. */ 1062 int (*elf_backend_additional_program_headers) 1063 (bfd *, struct bfd_link_info *); 1064 1065 /* This function is called to modify an existing segment map in a 1066 backend specific fashion. */ 1067 bfd_boolean (*elf_backend_modify_segment_map) 1068 (bfd *, struct bfd_link_info *); 1069 1070 /* This function is called to modify program headers just before 1071 they are written. */ 1072 bfd_boolean (*elf_backend_modify_program_headers) 1073 (bfd *, struct bfd_link_info *); 1074 1075 /* This function is called before section garbage collection to 1076 mark entry symbol sections. */ 1077 void (*gc_keep) 1078 (struct bfd_link_info *); 1079 1080 /* This function is called during section garbage collection to 1081 mark sections that define global symbols. */ 1082 bfd_boolean (*gc_mark_dynamic_ref) 1083 (struct elf_link_hash_entry *, void *); 1084 1085 /* This function is called during section gc to discover the section a 1086 particular relocation refers to. */ 1087 elf_gc_mark_hook_fn gc_mark_hook; 1088 1089 /* This function, if defined, is called after the first gc marking pass 1090 to allow the backend to mark additional sections. */ 1091 bfd_boolean (*gc_mark_extra_sections) 1092 (struct bfd_link_info *, elf_gc_mark_hook_fn); 1093 1094 /* This function, if defined, is called during the sweep phase of gc 1095 in order that a backend might update any data structures it might 1096 be maintaining. */ 1097 bfd_boolean (*gc_sweep_hook) 1098 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *); 1099 1100 /* This function, if defined, is called after the ELF headers have 1101 been created. This allows for things like the OS and ABI versions 1102 to be changed. */ 1103 void (*elf_backend_post_process_headers) 1104 (bfd *, struct bfd_link_info *); 1105 1106 /* This function, if defined, prints a symbol to file and returns the 1107 name of the symbol to be printed. It should return NULL to fall 1108 back to default symbol printing. */ 1109 const char *(*elf_backend_print_symbol_all) 1110 (bfd *, void *, asymbol *); 1111 1112 /* This function, if defined, is called after all local symbols and 1113 global symbols converted to locals are emitted into the symtab 1114 section. It allows the backend to emit special local symbols 1115 not handled in the hash table. */ 1116 bfd_boolean (*elf_backend_output_arch_local_syms) 1117 (bfd *, struct bfd_link_info *, void *, 1118 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 1119 struct elf_link_hash_entry *)); 1120 1121 /* This function, if defined, is called after all symbols are emitted 1122 into the symtab section. It allows the backend to emit special 1123 global symbols not handled in the hash table. */ 1124 bfd_boolean (*elf_backend_output_arch_syms) 1125 (bfd *, struct bfd_link_info *, void *, 1126 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 1127 struct elf_link_hash_entry *)); 1128 1129 /* Copy any information related to dynamic linking from a pre-existing 1130 symbol to a newly created symbol. Also called to copy flags and 1131 other back-end info to a weakdef, in which case the symbol is not 1132 newly created and plt/got refcounts and dynamic indices should not 1133 be copied. */ 1134 void (*elf_backend_copy_indirect_symbol) 1135 (struct bfd_link_info *, struct elf_link_hash_entry *, 1136 struct elf_link_hash_entry *); 1137 1138 /* Modify any information related to dynamic linking such that the 1139 symbol is not exported. */ 1140 void (*elf_backend_hide_symbol) 1141 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1142 1143 /* A function to do additional symbol fixup, called by 1144 _bfd_elf_fix_symbol_flags. */ 1145 bfd_boolean (*elf_backend_fixup_symbol) 1146 (struct bfd_link_info *, struct elf_link_hash_entry *); 1147 1148 /* Merge the backend specific symbol attribute. */ 1149 void (*elf_backend_merge_symbol_attribute) 1150 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean, 1151 bfd_boolean); 1152 1153 /* This function, if defined, will return a string containing the 1154 name of a target-specific dynamic tag. */ 1155 char *(*elf_backend_get_target_dtag) 1156 (bfd_vma); 1157 1158 /* Decide whether an undefined symbol is special and can be ignored. 1159 This is the case for OPTIONAL symbols on IRIX. */ 1160 bfd_boolean (*elf_backend_ignore_undef_symbol) 1161 (struct elf_link_hash_entry *); 1162 1163 /* Emit relocations. Overrides default routine for emitting relocs, 1164 except during a relocatable link, or if all relocs are being emitted. */ 1165 bfd_boolean (*elf_backend_emit_relocs) 1166 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 1167 struct elf_link_hash_entry **); 1168 1169 /* Count relocations. Not called for relocatable links 1170 or if all relocs are being preserved in the output. */ 1171 unsigned int (*elf_backend_count_relocs) 1172 (struct bfd_link_info *, asection *); 1173 1174 /* Count additionals relocations. Called for relocatable links if 1175 additional relocations needs to be created. */ 1176 unsigned int (*elf_backend_count_additional_relocs) 1177 (asection *); 1178 1179 /* Say whether to sort relocs output by ld -r and ld --emit-relocs, 1180 by r_offset. If NULL, default to true. */ 1181 bfd_boolean (*sort_relocs_p) 1182 (asection *); 1183 1184 /* This function, if defined, is called when an NT_PRSTATUS note is found 1185 in a core file. */ 1186 bfd_boolean (*elf_backend_grok_prstatus) 1187 (bfd *, Elf_Internal_Note *); 1188 1189 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO 1190 note is found in a core file. */ 1191 bfd_boolean (*elf_backend_grok_psinfo) 1192 (bfd *, Elf_Internal_Note *); 1193 1194 /* This function, if defined, is called to write a note to a corefile. */ 1195 char *(*elf_backend_write_core_note) 1196 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...); 1197 1198 /* This function, if defined, is called to convert target-specific 1199 section flag names into hex values. */ 1200 flagword (*elf_backend_lookup_section_flags_hook) 1201 (char *); 1202 1203 /* This function returns class of a reloc type. */ 1204 enum elf_reloc_type_class (*elf_backend_reloc_type_class) 1205 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *); 1206 1207 /* This function, if defined, removes information about discarded functions 1208 from other sections which mention them. */ 1209 bfd_boolean (*elf_backend_discard_info) 1210 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *); 1211 1212 /* This function, if defined, signals that the function above has removed 1213 the discarded relocations for this section. */ 1214 bfd_boolean (*elf_backend_ignore_discarded_relocs) 1215 (asection *); 1216 1217 /* What to do when ld finds relocations against symbols defined in 1218 discarded sections. */ 1219 unsigned int (*action_discarded) 1220 (asection *); 1221 1222 /* This function returns the width of FDE pointers in bytes, or 0 if 1223 that can't be determined for some reason. The default definition 1224 goes by the bfd's EI_CLASS. */ 1225 unsigned int (*elf_backend_eh_frame_address_size) 1226 (bfd *, asection *); 1227 1228 /* These functions tell elf-eh-frame whether to attempt to turn 1229 absolute or lsda encodings into pc-relative ones. The default 1230 definition enables these transformations. */ 1231 bfd_boolean (*elf_backend_can_make_relative_eh_frame) 1232 (bfd *, struct bfd_link_info *, asection *); 1233 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame) 1234 (bfd *, struct bfd_link_info *, asection *); 1235 1236 /* This function returns an encoding after computing the encoded 1237 value (and storing it in ENCODED) for the given OFFSET into OSEC, 1238 to be stored in at LOC_OFFSET into the LOC_SEC input section. 1239 The default definition chooses a 32-bit PC-relative encoding. */ 1240 bfd_byte (*elf_backend_encode_eh_address) 1241 (bfd *abfd, struct bfd_link_info *info, 1242 asection *osec, bfd_vma offset, 1243 asection *loc_sec, bfd_vma loc_offset, 1244 bfd_vma *encoded); 1245 1246 /* This function, if defined, may write out the given section. 1247 Returns TRUE if it did so and FALSE if the caller should. */ 1248 bfd_boolean (*elf_backend_write_section) 1249 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 1250 1251 /* The level of IRIX compatibility we're striving for. 1252 MIPS ELF specific function. */ 1253 irix_compat_t (*elf_backend_mips_irix_compat) 1254 (bfd *); 1255 1256 reloc_howto_type *(*elf_backend_mips_rtype_to_howto) 1257 (unsigned int, bfd_boolean); 1258 1259 /* The swapping table to use when dealing with ECOFF information. 1260 Used for the MIPS ELF .mdebug section. */ 1261 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap; 1262 1263 /* This function implements `bfd_elf_bfd_from_remote_memory'; 1264 see elf.c, elfcode.h. */ 1265 bfd *(*elf_backend_bfd_from_remote_memory) 1266 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 1267 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, 1268 bfd_size_type len)); 1269 1270 /* This function is used by `_bfd_elf_get_synthetic_symtab'; 1271 see elf.c. */ 1272 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *); 1273 1274 /* Is symbol defined in common section? */ 1275 bfd_boolean (*common_definition) (Elf_Internal_Sym *); 1276 1277 /* Return a common section index for section. */ 1278 unsigned int (*common_section_index) (asection *); 1279 1280 /* Return a common section for section. */ 1281 asection *(*common_section) (asection *); 1282 1283 /* Return TRUE if we can merge 2 definitions. */ 1284 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *, 1285 const Elf_Internal_Sym *, asection **, 1286 bfd_boolean, bfd_boolean, 1287 bfd *, const asection *); 1288 1289 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 1290 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *); 1291 1292 /* Return TRUE if type is a function symbol type. */ 1293 bfd_boolean (*is_function_type) (unsigned int type); 1294 1295 /* If the ELF symbol SYM might be a function in SEC, return the 1296 function size and set *CODE_OFF to the function's entry point, 1297 otherwise return zero. */ 1298 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec, 1299 bfd_vma *code_off); 1300 1301 /* Return the section which RELOC_SEC applies to. */ 1302 asection *(*get_reloc_section) (asection *reloc_sec); 1303 1304 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which 1305 has a type >= SHT_LOOS. Returns TRUE if the fields were initialised, 1306 FALSE otherwise. Can be called multiple times for a given section, 1307 until it returns TRUE. Most of the times it is called ISECTION will be 1308 set to an input section that might be associated with the output section. 1309 The last time that it is called, ISECTION will be set to NULL. */ 1310 bfd_boolean (*elf_backend_copy_special_section_fields) 1311 (const bfd *ibfd, bfd *obfd, const Elf_Internal_Shdr *isection, 1312 Elf_Internal_Shdr *osection); 1313 1314 /* Used to handle bad SHF_LINK_ORDER input. */ 1315 bfd_error_handler_type link_order_error_handler; 1316 1317 /* Name of the PLT relocation section. */ 1318 const char *relplt_name; 1319 1320 /* Alternate EM_xxxx machine codes for this backend. */ 1321 int elf_machine_alt1; 1322 int elf_machine_alt2; 1323 1324 const struct elf_size_info *s; 1325 1326 /* An array of target specific special sections. */ 1327 const struct bfd_elf_special_section *special_sections; 1328 1329 /* The size in bytes of the header for the GOT. This includes the 1330 so-called reserved entries on some systems. */ 1331 bfd_vma got_header_size; 1332 1333 /* The size of the GOT entry for the symbol pointed to by H if non-NULL, 1334 otherwise by the local symbol with index SYMNDX in IBFD. */ 1335 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *, 1336 struct elf_link_hash_entry *h, 1337 bfd *ibfd, unsigned long symndx); 1338 1339 /* The vendor name to use for a processor-standard attributes section. */ 1340 const char *obj_attrs_vendor; 1341 1342 /* The section name to use for a processor-standard attributes section. */ 1343 const char *obj_attrs_section; 1344 1345 /* Return 1, 2 or 3 to indicate what type of arguments a 1346 processor-specific tag takes. */ 1347 int (*obj_attrs_arg_type) (int); 1348 1349 /* The section type to use for an attributes section. */ 1350 unsigned int obj_attrs_section_type; 1351 1352 /* This function determines the order in which any attributes are 1353 written. It must be defined for input in the range 1354 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range 1355 is used in order to make unity easy). The returned value is the 1356 actual tag number to place in the input position. */ 1357 int (*obj_attrs_order) (int); 1358 1359 /* Handle merging unknown attributes; either warn and return TRUE, 1360 or give an error and return FALSE. */ 1361 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int); 1362 1363 /* Encoding used for compact EH tables. */ 1364 int (*compact_eh_encoding) (struct bfd_link_info *); 1365 1366 /* Opcode representing no unwind. */ 1367 int (*cant_unwind_opcode) (struct bfd_link_info *); 1368 1369 /* This is non-zero if static TLS segments require a special alignment. */ 1370 unsigned static_tls_alignment; 1371 1372 /* Alignment for the PT_GNU_STACK segment. */ 1373 unsigned stack_align; 1374 1375 /* Flag bits to assign to a section of type SHT_STRTAB. */ 1376 unsigned long elf_strtab_flags; 1377 1378 /* This is TRUE if the linker should act like collect and gather 1379 global constructors and destructors by name. This is TRUE for 1380 MIPS ELF because the Irix 5 tools can not handle the .init 1381 section. */ 1382 unsigned collect : 1; 1383 1384 /* This is TRUE if the linker should ignore changes to the type of a 1385 symbol. This is TRUE for MIPS ELF because some Irix 5 objects 1386 record undefined functions as STT_OBJECT although the definitions 1387 are STT_FUNC. */ 1388 unsigned type_change_ok : 1; 1389 1390 /* Whether the backend may use REL relocations. (Some backends use 1391 both REL and RELA relocations, and this flag is set for those 1392 backends.) */ 1393 unsigned may_use_rel_p : 1; 1394 1395 /* Whether the backend may use RELA relocations. (Some backends use 1396 both REL and RELA relocations, and this flag is set for those 1397 backends.) */ 1398 unsigned may_use_rela_p : 1; 1399 1400 /* Whether the default relocation type is RELA. If a backend with 1401 this flag set wants REL relocations for a particular section, 1402 it must note that explicitly. Similarly, if this flag is clear, 1403 and the backend wants RELA relocations for a particular 1404 section. */ 1405 unsigned default_use_rela_p : 1; 1406 1407 /* True if PLT and copy relocations should be RELA by default. */ 1408 unsigned rela_plts_and_copies_p : 1; 1409 1410 /* Set if RELA relocations for a relocatable link can be handled by 1411 generic code. Backends that set this flag need do nothing in the 1412 backend relocate_section routine for relocatable linking. */ 1413 unsigned rela_normal : 1; 1414 1415 /* TRUE if addresses "naturally" sign extend. This is used when 1416 swapping in from Elf32 when BFD64. */ 1417 unsigned sign_extend_vma : 1; 1418 1419 unsigned want_got_plt : 1; 1420 unsigned plt_readonly : 1; 1421 unsigned want_plt_sym : 1; 1422 unsigned plt_not_loaded : 1; 1423 unsigned plt_alignment : 4; 1424 unsigned can_gc_sections : 1; 1425 unsigned can_refcount : 1; 1426 unsigned want_got_sym : 1; 1427 unsigned want_dynbss : 1; 1428 1429 /* Targets which do not support physical addressing often require 1430 that the p_paddr field in the section header to be set to zero. 1431 This field indicates whether this behavior is required. */ 1432 unsigned want_p_paddr_set_to_zero : 1; 1433 1434 /* True if an object file lacking a .note.GNU-stack section 1435 should be assumed to be requesting exec stack. At least one 1436 other file in the link needs to have a .note.GNU-stack section 1437 for a PT_GNU_STACK segment to be created. */ 1438 unsigned default_execstack : 1; 1439 1440 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize 1441 in length rather than sec->size in length, if sec->rawsize is 1442 non-zero and smaller than sec->size. */ 1443 unsigned caches_rawsize : 1; 1444 1445 /* Address of protected data defined in the shared library may be 1446 external, i.e., due to copy relocation. */ 1447 unsigned extern_protected_data : 1; 1448 }; 1449 1450 /* Information about reloc sections associated with a bfd_elf_section_data 1451 structure. */ 1452 struct bfd_elf_section_reloc_data 1453 { 1454 /* The ELF header for the reloc section associated with this 1455 section, if any. */ 1456 Elf_Internal_Shdr *hdr; 1457 /* The number of relocations currently assigned to HDR. */ 1458 unsigned int count; 1459 /* The ELF section number of the reloc section. Only used for an 1460 output file. */ 1461 int idx; 1462 /* Used by the backend linker to store the symbol hash table entries 1463 associated with relocs against global symbols. */ 1464 struct elf_link_hash_entry **hashes; 1465 }; 1466 1467 /* Information stored for each BFD section in an ELF file. This 1468 structure is allocated by elf_new_section_hook. */ 1469 1470 struct bfd_elf_section_data 1471 { 1472 /* The ELF header for this section. */ 1473 Elf_Internal_Shdr this_hdr; 1474 1475 /* INPUT_SECTION_FLAGS if specified in the linker script. */ 1476 struct flag_info *section_flag_info; 1477 1478 /* Information about the REL and RELA reloc sections associated 1479 with this section, if any. */ 1480 struct bfd_elf_section_reloc_data rel, rela; 1481 1482 /* The ELF section number of this section. */ 1483 int this_idx; 1484 1485 /* Used by the backend linker when generating a shared library to 1486 record the dynamic symbol index for a section symbol 1487 corresponding to this section. A value of 0 means that there is 1488 no dynamic symbol for this section. */ 1489 int dynindx; 1490 1491 /* A pointer to the linked-to section for SHF_LINK_ORDER. */ 1492 asection *linked_to; 1493 1494 /* A pointer to the swapped relocs. If the section uses REL relocs, 1495 rather than RELA, all the r_addend fields will be zero. This 1496 pointer may be NULL. It is used by the backend linker. */ 1497 Elf_Internal_Rela *relocs; 1498 1499 /* A pointer to a linked list tracking dynamic relocs copied for 1500 local symbols. */ 1501 void *local_dynrel; 1502 1503 /* A pointer to the bfd section used for dynamic relocs. */ 1504 asection *sreloc; 1505 1506 union { 1507 /* Group name, if this section is a member of a group. */ 1508 const char *name; 1509 1510 /* Group signature sym, if this is the SHT_GROUP section. */ 1511 struct bfd_symbol *id; 1512 } group; 1513 1514 /* For a member of a group, points to the SHT_GROUP section. 1515 NULL for the SHT_GROUP section itself and non-group sections. */ 1516 asection *sec_group; 1517 1518 /* A linked list of member sections in the group. Circular when used by 1519 the linker. For the SHT_GROUP section, points at first member. */ 1520 asection *next_in_group; 1521 1522 /* The FDEs associated with this section. The u.fde.next_in_section 1523 field acts as a chain pointer. */ 1524 struct eh_cie_fde *fde_list; 1525 1526 /* Link from a text section to its .eh_frame_entry section. */ 1527 asection *eh_frame_entry; 1528 1529 /* A pointer used for various section optimizations. */ 1530 void *sec_info; 1531 }; 1532 1533 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd) 1534 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to) 1535 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type) 1536 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags) 1537 #define elf_group_name(sec) (elf_section_data(sec)->group.name) 1538 #define elf_group_id(sec) (elf_section_data(sec)->group.id) 1539 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group) 1540 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list) 1541 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group) 1542 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry) 1543 1544 #define xvec_get_elf_backend_data(xvec) \ 1545 ((const struct elf_backend_data *) (xvec)->backend_data) 1546 1547 #define get_elf_backend_data(abfd) \ 1548 xvec_get_elf_backend_data ((abfd)->xvec) 1549 1550 /* The least object attributes (within an attributes subsection) known 1551 for any target. Some code assumes that the value 0 is not used and 1552 the field for that attribute can instead be used as a marker to 1553 indicate that attributes have been initialized. */ 1554 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2 1555 1556 /* The maximum number of known object attributes for any target. */ 1557 #define NUM_KNOWN_OBJ_ATTRIBUTES 71 1558 1559 /* The value of an object attribute. The type indicates whether the attribute 1560 holds and integer, a string, or both. It can also indicate that there can 1561 be no default (i.e. all values must be written to file, even zero), and whether 1562 it exists in bfd to begin with. */ 1563 1564 typedef struct obj_attribute 1565 { 1566 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0) 1567 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1) 1568 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2) 1569 #define ATTR_TYPE_FLAG_EXIST (1 << 3) 1570 1571 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL) 1572 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL) 1573 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT) 1574 #define ATTR_TYPE_EXIST(TYPE) ((TYPE) & ATTR_TYPE_FLAG_EXIST) 1575 1576 int type; 1577 unsigned int i; 1578 char *s; 1579 } obj_attribute; 1580 1581 typedef struct obj_attribute_list 1582 { 1583 struct obj_attribute_list *next; 1584 unsigned int tag; 1585 obj_attribute attr; 1586 } obj_attribute_list; 1587 1588 /* Object attributes may either be defined by the processor ABI, index 1589 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific 1590 (and possibly also processor-specific), index OBJ_ATTR_GNU. */ 1591 #define OBJ_ATTR_PROC 0 1592 #define OBJ_ATTR_GNU 1 1593 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC 1594 #define OBJ_ATTR_LAST OBJ_ATTR_GNU 1595 1596 /* The following object attribute tags are taken as generic, for all 1597 targets and for "gnu" where there is no target standard. */ 1598 enum 1599 { 1600 Tag_NULL = 0, 1601 Tag_File = 1, 1602 Tag_Section = 2, 1603 Tag_Symbol = 3, 1604 Tag_compatibility = 32 1605 }; 1606 1607 /* The following struct stores information about every SystemTap section 1608 found in the object file. */ 1609 struct sdt_note 1610 { 1611 struct sdt_note *next; 1612 bfd_size_type size; 1613 bfd_byte data[1]; 1614 }; 1615 1616 /* tdata information grabbed from an elf core file. */ 1617 struct core_elf_obj_tdata 1618 { 1619 int signal; 1620 int pid; 1621 int lwpid; 1622 char* program; 1623 char* command; 1624 }; 1625 1626 /* Extra tdata information held for output ELF BFDs. */ 1627 struct output_elf_obj_tdata 1628 { 1629 struct elf_segment_map *seg_map; 1630 struct elf_strtab_hash *strtab_ptr; 1631 1632 /* STT_SECTION symbols for each section */ 1633 asymbol **section_syms; 1634 1635 /* Used to determine if PT_GNU_EH_FRAME segment header should be 1636 created. */ 1637 asection *eh_frame_hdr; 1638 1639 /* NT_GNU_BUILD_ID note type info. */ 1640 struct 1641 { 1642 bfd_boolean (*after_write_object_contents) (bfd *); 1643 const char *style; 1644 asection *sec; 1645 } build_id; 1646 1647 /* Records the result of `get_program_header_size'. */ 1648 bfd_size_type program_header_size; 1649 1650 /* Used when laying out sections. */ 1651 file_ptr next_file_pos; 1652 1653 int num_section_syms; 1654 unsigned int shstrtab_section, strtab_section; 1655 1656 /* Segment flags for the PT_GNU_STACK segment. */ 1657 unsigned int stack_flags; 1658 1659 /* This is set to TRUE if the object was created by the backend 1660 linker. */ 1661 bfd_boolean linker; 1662 1663 /* Used to determine if the e_flags field has been initialized */ 1664 bfd_boolean flags_init; 1665 }; 1666 1667 /* Indicate if the bfd contains symbols that have the STT_GNU_IFUNC 1668 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi 1669 field in the ELF header structure. */ 1670 enum elf_gnu_symbols 1671 { 1672 elf_gnu_symbol_none = 0, 1673 elf_gnu_symbol_any = 1 << 0, 1674 elf_gnu_symbol_ifunc = (elf_gnu_symbol_any | 1 << 1), 1675 elf_gnu_symbol_unique = (elf_gnu_symbol_any | 1 << 2), 1676 elf_gnu_symbol_all = (elf_gnu_symbol_ifunc | elf_gnu_symbol_unique) 1677 }; 1678 1679 typedef struct elf_section_list 1680 { 1681 Elf_Internal_Shdr hdr; 1682 unsigned int ndx; 1683 struct elf_section_list * next; 1684 } elf_section_list; 1685 1686 1687 /* Some private data is stashed away for future use using the tdata pointer 1688 in the bfd structure. */ 1689 1690 struct elf_obj_tdata 1691 { 1692 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */ 1693 Elf_Internal_Shdr **elf_sect_ptr; 1694 Elf_Internal_Phdr *phdr; 1695 Elf_Internal_Shdr symtab_hdr; 1696 Elf_Internal_Shdr shstrtab_hdr; 1697 Elf_Internal_Shdr strtab_hdr; 1698 Elf_Internal_Shdr dynsymtab_hdr; 1699 Elf_Internal_Shdr dynstrtab_hdr; 1700 Elf_Internal_Shdr dynversym_hdr; 1701 Elf_Internal_Shdr dynverref_hdr; 1702 Elf_Internal_Shdr dynverdef_hdr; 1703 elf_section_list * symtab_shndx_list; 1704 bfd_vma gp; /* The gp value */ 1705 unsigned int gp_size; /* The gp size */ 1706 unsigned int num_elf_sections; /* elf_sect_ptr size */ 1707 1708 /* A mapping from external symbols to entries in the linker hash 1709 table, used when linking. This is indexed by the symbol index 1710 minus the sh_info field of the symbol table header. */ 1711 struct elf_link_hash_entry **sym_hashes; 1712 1713 /* Track usage and final offsets of GOT entries for local symbols. 1714 This array is indexed by symbol index. Elements are used 1715 identically to "got" in struct elf_link_hash_entry. */ 1716 union 1717 { 1718 bfd_signed_vma *refcounts; 1719 bfd_vma *offsets; 1720 struct got_entry **ents; 1721 } local_got; 1722 1723 /* The linker ELF emulation code needs to let the backend ELF linker 1724 know what filename should be used for a dynamic object if the 1725 dynamic object is found using a search. The emulation code then 1726 sometimes needs to know what name was actually used. Until the 1727 file has been added to the linker symbol table, this field holds 1728 the name the linker wants. After it has been added, it holds the 1729 name actually used, which will be the DT_SONAME entry if there is 1730 one. */ 1731 const char *dt_name; 1732 1733 /* The linker emulation needs to know what audit libs 1734 are used by a dynamic object. */ 1735 const char *dt_audit; 1736 1737 /* Used by find_nearest_line entry point. */ 1738 void *line_info; 1739 1740 /* A place to stash dwarf1 info for this bfd. */ 1741 struct dwarf1_debug *dwarf1_find_line_info; 1742 1743 /* A place to stash dwarf2 info for this bfd. */ 1744 void *dwarf2_find_line_info; 1745 1746 /* Stash away info for yet another find line/function variant. */ 1747 void *elf_find_function_cache; 1748 1749 /* Number of symbol version definitions we are about to emit. */ 1750 unsigned int cverdefs; 1751 1752 /* Number of symbol version references we are about to emit. */ 1753 unsigned int cverrefs; 1754 1755 /* Symbol version definitions in external objects. */ 1756 Elf_Internal_Verdef *verdef; 1757 1758 /* Symbol version references to external objects. */ 1759 Elf_Internal_Verneed *verref; 1760 1761 /* A pointer to the .eh_frame section. */ 1762 asection *eh_frame_section; 1763 1764 /* Symbol buffer. */ 1765 void *symbuf; 1766 1767 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES]; 1768 obj_attribute_list *other_obj_attributes[2]; 1769 1770 /* Linked-list containing information about every Systemtap section 1771 found in the object file. Each section corresponds to one entry 1772 in the list. */ 1773 struct sdt_note *sdt_note_head; 1774 1775 Elf_Internal_Shdr **group_sect_ptr; 1776 int num_group; 1777 1778 unsigned int symtab_section, dynsymtab_section; 1779 unsigned int dynversym_section, dynverdef_section, dynverref_section; 1780 1781 /* An identifier used to distinguish different target 1782 specific extensions to this structure. */ 1783 enum elf_target_id object_id; 1784 1785 /* Whether a dyanmic object was specified normally on the linker 1786 command line, or was specified when --as-needed was in effect, 1787 or was found via a DT_NEEDED entry. */ 1788 enum dynamic_lib_link_class dyn_lib_class; 1789 1790 /* Irix 5 often screws up the symbol table, sorting local symbols 1791 after global symbols. This flag is set if the symbol table in 1792 this BFD appears to be screwed up. If it is, we ignore the 1793 sh_info field in the symbol table header, and always read all the 1794 symbols. */ 1795 bfd_boolean bad_symtab; 1796 1797 enum elf_gnu_symbols has_gnu_symbols; 1798 1799 /* Information grabbed from an elf core file. */ 1800 struct core_elf_obj_tdata *core; 1801 1802 /* More information held for output ELF BFDs. */ 1803 struct output_elf_obj_tdata *o; 1804 }; 1805 1806 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data) 1807 1808 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id) 1809 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size) 1810 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header) 1811 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr) 1812 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections) 1813 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map) 1814 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos) 1815 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr) 1816 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker) 1817 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags) 1818 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr) 1819 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section) 1820 #define elf_symtab_shndx_list(bfd) (elf_tdata(bfd) -> symtab_shndx_list) 1821 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section) 1822 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section) 1823 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr) 1824 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section) 1825 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section) 1826 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section) 1827 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section) 1828 #define elf_eh_frame_section(bfd) \ 1829 (elf_tdata(bfd) -> eh_frame_section) 1830 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms) 1831 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms) 1832 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo) 1833 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus) 1834 #define elf_gp(bfd) (elf_tdata(bfd) -> gp) 1835 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size) 1836 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes) 1837 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts) 1838 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets) 1839 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents) 1840 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name) 1841 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit) 1842 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class) 1843 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab) 1844 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init) 1845 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes) 1846 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes) 1847 #define elf_known_obj_attributes_proc(bfd) \ 1848 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1849 #define elf_other_obj_attributes_proc(bfd) \ 1850 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1851 1852 extern void _bfd_elf_swap_verdef_in 1853 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *); 1854 extern void _bfd_elf_swap_verdef_out 1855 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *); 1856 extern void _bfd_elf_swap_verdaux_in 1857 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *); 1858 extern void _bfd_elf_swap_verdaux_out 1859 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *); 1860 extern void _bfd_elf_swap_verneed_in 1861 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *); 1862 extern void _bfd_elf_swap_verneed_out 1863 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *); 1864 extern void _bfd_elf_swap_vernaux_in 1865 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *); 1866 extern void _bfd_elf_swap_vernaux_out 1867 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *); 1868 extern void _bfd_elf_swap_versym_in 1869 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *); 1870 extern void _bfd_elf_swap_versym_out 1871 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *); 1872 1873 extern unsigned int _bfd_elf_section_from_bfd_section 1874 (bfd *, asection *); 1875 extern char *bfd_elf_string_from_elf_section 1876 (bfd *, unsigned, unsigned); 1877 extern Elf_Internal_Sym *bfd_elf_get_elf_syms 1878 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *, 1879 Elf_External_Sym_Shndx *); 1880 extern const char *bfd_elf_sym_name 1881 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *); 1882 1883 extern bfd_boolean _bfd_elf_copy_private_bfd_data 1884 (bfd *, bfd *); 1885 extern bfd_boolean _bfd_elf_print_private_bfd_data 1886 (bfd *, void *); 1887 const char * _bfd_elf_get_symbol_version_string 1888 (bfd *, asymbol *, bfd_boolean *); 1889 extern void bfd_elf_print_symbol 1890 (bfd *, void *, asymbol *, bfd_print_symbol_type); 1891 1892 extern unsigned int _bfd_elf_eh_frame_address_size 1893 (bfd *, asection *); 1894 extern bfd_byte _bfd_elf_encode_eh_address 1895 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset, 1896 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded); 1897 extern bfd_boolean _bfd_elf_can_make_relative 1898 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section); 1899 1900 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class 1901 (const struct bfd_link_info *, const asection *, 1902 const Elf_Internal_Rela *); 1903 extern bfd_vma _bfd_elf_rela_local_sym 1904 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *); 1905 extern bfd_vma _bfd_elf_rel_local_sym 1906 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma); 1907 extern bfd_vma _bfd_elf_section_offset 1908 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1909 1910 extern unsigned long bfd_elf_hash 1911 (const char *); 1912 extern unsigned long bfd_elf_gnu_hash 1913 (const char *); 1914 1915 extern bfd_reloc_status_type bfd_elf_generic_reloc 1916 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 1917 extern bfd_boolean bfd_elf_allocate_object 1918 (bfd *, size_t, enum elf_target_id); 1919 extern bfd_boolean bfd_elf_make_object 1920 (bfd *); 1921 extern bfd_boolean bfd_elf_mkcorefile 1922 (bfd *); 1923 extern bfd_boolean _bfd_elf_make_section_from_shdr 1924 (bfd *, Elf_Internal_Shdr *, const char *, int); 1925 extern bfd_boolean _bfd_elf_make_section_from_phdr 1926 (bfd *, Elf_Internal_Phdr *, int, const char *); 1927 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc 1928 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 1929 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create 1930 (bfd *); 1931 extern void _bfd_elf_link_hash_table_free 1932 (bfd *); 1933 extern void _bfd_elf_link_hash_copy_indirect 1934 (struct bfd_link_info *, struct elf_link_hash_entry *, 1935 struct elf_link_hash_entry *); 1936 extern void _bfd_elf_link_hash_hide_symbol 1937 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1938 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol 1939 (struct bfd_link_info *, struct elf_link_hash_entry *); 1940 extern bfd_boolean _bfd_elf_link_hash_table_init 1941 (struct elf_link_hash_table *, bfd *, 1942 struct bfd_hash_entry *(*) 1943 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *), 1944 unsigned int, enum elf_target_id); 1945 extern bfd_boolean _bfd_elf_slurp_version_tables 1946 (bfd *, bfd_boolean); 1947 extern bfd_boolean _bfd_elf_merge_sections 1948 (bfd *, struct bfd_link_info *); 1949 extern bfd_boolean _bfd_elf_match_sections_by_type 1950 (bfd *, const asection *, bfd *, const asection *); 1951 extern bfd_boolean bfd_elf_is_group_section 1952 (bfd *, const struct bfd_section *); 1953 extern bfd_boolean _bfd_elf_section_already_linked 1954 (bfd *, asection *, struct bfd_link_info *); 1955 extern void bfd_elf_set_group_contents 1956 (bfd *, asection *, void *); 1957 extern asection *_bfd_elf_check_kept_section 1958 (asection *, struct bfd_link_info *); 1959 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms 1960 extern void _bfd_elf_copy_link_hash_symbol_type 1961 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *); 1962 extern bfd_boolean _bfd_elf_size_group_sections 1963 (struct bfd_link_info *); 1964 extern bfd_boolean _bfd_elf_fixup_group_sections 1965 (bfd *, asection *); 1966 extern bfd_boolean _bfd_elf_copy_private_header_data 1967 (bfd *, bfd *); 1968 extern bfd_boolean _bfd_elf_copy_private_symbol_data 1969 (bfd *, asymbol *, bfd *, asymbol *); 1970 #define _bfd_generic_init_private_section_data \ 1971 _bfd_elf_init_private_section_data 1972 extern bfd_boolean _bfd_elf_init_private_section_data 1973 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *); 1974 extern bfd_boolean _bfd_elf_copy_private_section_data 1975 (bfd *, asection *, bfd *, asection *); 1976 extern bfd_boolean _bfd_elf_write_object_contents 1977 (bfd *); 1978 extern bfd_boolean _bfd_elf_write_corefile_contents 1979 (bfd *); 1980 extern bfd_boolean _bfd_elf_set_section_contents 1981 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type); 1982 extern long _bfd_elf_get_symtab_upper_bound 1983 (bfd *); 1984 extern long _bfd_elf_canonicalize_symtab 1985 (bfd *, asymbol **); 1986 extern long _bfd_elf_get_dynamic_symtab_upper_bound 1987 (bfd *); 1988 extern long _bfd_elf_canonicalize_dynamic_symtab 1989 (bfd *, asymbol **); 1990 extern long _bfd_elf_get_synthetic_symtab 1991 (bfd *, long, asymbol **, long, asymbol **, asymbol **); 1992 extern long _bfd_elf_get_reloc_upper_bound 1993 (bfd *, sec_ptr); 1994 extern long _bfd_elf_canonicalize_reloc 1995 (bfd *, sec_ptr, arelent **, asymbol **); 1996 extern asection * _bfd_elf_get_dynamic_reloc_section 1997 (bfd *, asection *, bfd_boolean); 1998 extern asection * _bfd_elf_make_dynamic_reloc_section 1999 (asection *, bfd *, unsigned int, bfd *, bfd_boolean); 2000 extern long _bfd_elf_get_dynamic_reloc_upper_bound 2001 (bfd *); 2002 extern long _bfd_elf_canonicalize_dynamic_reloc 2003 (bfd *, arelent **, asymbol **); 2004 extern asymbol *_bfd_elf_make_empty_symbol 2005 (bfd *); 2006 extern void _bfd_elf_get_symbol_info 2007 (bfd *, asymbol *, symbol_info *); 2008 extern bfd_boolean _bfd_elf_is_local_label_name 2009 (bfd *, const char *); 2010 extern alent *_bfd_elf_get_lineno 2011 (bfd *, asymbol *); 2012 extern bfd_boolean _bfd_elf_set_arch_mach 2013 (bfd *, enum bfd_architecture, unsigned long); 2014 extern bfd_boolean _bfd_elf_find_nearest_line 2015 (bfd *, asymbol **, asection *, bfd_vma, 2016 const char **, const char **, unsigned int *, unsigned int *); 2017 extern bfd_boolean _bfd_elf_find_line 2018 (bfd *, asymbol **, asymbol *, const char **, unsigned int *); 2019 extern bfd_boolean _bfd_elf_find_inliner_info 2020 (bfd *, const char **, const char **, unsigned int *); 2021 extern asymbol *_bfd_elf_find_function 2022 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **); 2023 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols 2024 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 2025 extern int _bfd_elf_sizeof_headers 2026 (bfd *, struct bfd_link_info *); 2027 extern bfd_boolean _bfd_elf_new_section_hook 2028 (bfd *, asection *); 2029 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section 2030 (const char *, const struct bfd_elf_special_section *, unsigned int); 2031 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr 2032 (bfd *, asection *); 2033 2034 /* If the target doesn't have reloc handling written yet: */ 2035 extern void _bfd_elf_no_info_to_howto 2036 (bfd *, arelent *, Elf_Internal_Rela *); 2037 2038 extern bfd_boolean bfd_section_from_shdr 2039 (bfd *, unsigned int shindex); 2040 extern bfd_boolean bfd_section_from_phdr 2041 (bfd *, Elf_Internal_Phdr *, int); 2042 2043 extern int _bfd_elf_symbol_from_bfd_symbol 2044 (bfd *, asymbol **); 2045 2046 extern Elf_Internal_Sym *bfd_sym_from_r_symndx 2047 (struct sym_cache *, bfd *, unsigned long); 2048 extern asection *bfd_section_from_elf_index 2049 (bfd *, unsigned int); 2050 2051 extern struct elf_strtab_hash * _bfd_elf_strtab_init 2052 (void); 2053 extern void _bfd_elf_strtab_free 2054 (struct elf_strtab_hash *); 2055 extern size_t _bfd_elf_strtab_add 2056 (struct elf_strtab_hash *, const char *, bfd_boolean); 2057 extern void _bfd_elf_strtab_addref 2058 (struct elf_strtab_hash *, size_t); 2059 extern void _bfd_elf_strtab_delref 2060 (struct elf_strtab_hash *, size_t); 2061 extern unsigned int _bfd_elf_strtab_refcount 2062 (struct elf_strtab_hash *, size_t); 2063 extern void _bfd_elf_strtab_clear_all_refs 2064 (struct elf_strtab_hash *); 2065 extern void *_bfd_elf_strtab_save 2066 (struct elf_strtab_hash *); 2067 extern void _bfd_elf_strtab_restore 2068 (struct elf_strtab_hash *, void *); 2069 extern bfd_size_type _bfd_elf_strtab_size 2070 (struct elf_strtab_hash *); 2071 extern bfd_size_type _bfd_elf_strtab_offset 2072 (struct elf_strtab_hash *, size_t); 2073 extern bfd_boolean _bfd_elf_strtab_emit 2074 (bfd *, struct elf_strtab_hash *); 2075 extern void _bfd_elf_strtab_finalize 2076 (struct elf_strtab_hash *); 2077 2078 extern bfd_boolean bfd_elf_parse_eh_frame_entries 2079 (bfd *, struct bfd_link_info *); 2080 extern bfd_boolean _bfd_elf_parse_eh_frame_entry 2081 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *); 2082 extern void _bfd_elf_parse_eh_frame 2083 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *); 2084 extern bfd_boolean _bfd_elf_end_eh_frame_parsing 2085 (struct bfd_link_info *info); 2086 2087 extern bfd_boolean _bfd_elf_discard_section_eh_frame 2088 (bfd *, struct bfd_link_info *, asection *, 2089 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *); 2090 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr 2091 (bfd *, struct bfd_link_info *); 2092 extern bfd_vma _bfd_elf_eh_frame_section_offset 2093 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 2094 extern bfd_boolean _bfd_elf_write_section_eh_frame 2095 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 2096 bfd_boolean _bfd_elf_write_section_eh_frame_entry 2097 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 2098 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *); 2099 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr 2100 (bfd *, struct bfd_link_info *); 2101 extern bfd_boolean _bfd_elf_eh_frame_present 2102 (struct bfd_link_info *); 2103 extern bfd_boolean _bfd_elf_eh_frame_entry_present 2104 (struct bfd_link_info *); 2105 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr 2106 (struct bfd_link_info *); 2107 2108 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *); 2109 2110 extern long _bfd_elf_link_lookup_local_dynindx 2111 (struct bfd_link_info *, bfd *, long); 2112 extern bfd_boolean _bfd_elf_compute_section_file_positions 2113 (bfd *, struct bfd_link_info *); 2114 extern file_ptr _bfd_elf_assign_file_position_for_section 2115 (Elf_Internal_Shdr *, file_ptr, bfd_boolean); 2116 2117 extern bfd_boolean _bfd_elf_validate_reloc 2118 (bfd *, arelent *); 2119 2120 extern bfd_boolean _bfd_elf_link_create_dynamic_sections 2121 (bfd *, struct bfd_link_info *); 2122 extern bfd_boolean _bfd_elf_link_omit_section_dynsym 2123 (bfd *, struct bfd_link_info *, asection *); 2124 extern bfd_boolean _bfd_elf_create_dynamic_sections 2125 (bfd *, struct bfd_link_info *); 2126 extern bfd_boolean _bfd_elf_create_got_section 2127 (bfd *, struct bfd_link_info *); 2128 extern asection *_bfd_elf_section_for_symbol 2129 (struct elf_reloc_cookie *, unsigned long, bfd_boolean); 2130 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym 2131 (bfd *, struct bfd_link_info *, asection *, const char *); 2132 extern void _bfd_elf_init_1_index_section 2133 (bfd *, struct bfd_link_info *); 2134 extern void _bfd_elf_init_2_index_sections 2135 (bfd *, struct bfd_link_info *); 2136 2137 extern bfd_boolean _bfd_elfcore_make_pseudosection 2138 (bfd *, char *, size_t, ufile_ptr); 2139 extern char *_bfd_elfcore_strndup 2140 (bfd *, char *, size_t); 2141 2142 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs 2143 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean); 2144 2145 extern bfd_boolean _bfd_elf_link_output_relocs 2146 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 2147 struct elf_link_hash_entry **); 2148 2149 extern bfd_boolean _bfd_elf_adjust_dynamic_copy 2150 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *); 2151 2152 extern bfd_boolean _bfd_elf_dynamic_symbol_p 2153 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2154 2155 extern bfd_boolean _bfd_elf_symbol_refs_local_p 2156 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2157 2158 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation 2159 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma); 2160 2161 extern bfd_boolean _bfd_elf_setup_sections 2162 (bfd *); 2163 2164 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *); 2165 2166 extern const bfd_target *bfd_elf32_object_p 2167 (bfd *); 2168 extern const bfd_target *bfd_elf32_core_file_p 2169 (bfd *); 2170 extern char *bfd_elf32_core_file_failing_command 2171 (bfd *); 2172 extern int bfd_elf32_core_file_failing_signal 2173 (bfd *); 2174 extern bfd_boolean bfd_elf32_core_file_matches_executable_p 2175 (bfd *, bfd *); 2176 extern int bfd_elf32_core_file_pid 2177 (bfd *); 2178 2179 extern bfd_boolean bfd_elf32_swap_symbol_in 2180 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2181 extern void bfd_elf32_swap_symbol_out 2182 (bfd *, const Elf_Internal_Sym *, void *, void *); 2183 extern void bfd_elf32_swap_reloc_in 2184 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2185 extern void bfd_elf32_swap_reloc_out 2186 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2187 extern void bfd_elf32_swap_reloca_in 2188 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2189 extern void bfd_elf32_swap_reloca_out 2190 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2191 extern void bfd_elf32_swap_phdr_in 2192 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *); 2193 extern void bfd_elf32_swap_phdr_out 2194 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *); 2195 extern void bfd_elf32_swap_dyn_in 2196 (bfd *, const void *, Elf_Internal_Dyn *); 2197 extern void bfd_elf32_swap_dyn_out 2198 (bfd *, const Elf_Internal_Dyn *, void *); 2199 extern long bfd_elf32_slurp_symbol_table 2200 (bfd *, asymbol **, bfd_boolean); 2201 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr 2202 (bfd *); 2203 extern int bfd_elf32_write_out_phdrs 2204 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2205 extern bfd_boolean bfd_elf32_checksum_contents 2206 (bfd * , void (*) (const void *, size_t, void *), void *); 2207 extern void bfd_elf32_write_relocs 2208 (bfd *, asection *, void *); 2209 extern bfd_boolean bfd_elf32_slurp_reloc_table 2210 (bfd *, asection *, asymbol **, bfd_boolean); 2211 2212 extern const bfd_target *bfd_elf64_object_p 2213 (bfd *); 2214 extern const bfd_target *bfd_elf64_core_file_p 2215 (bfd *); 2216 extern char *bfd_elf64_core_file_failing_command 2217 (bfd *); 2218 extern int bfd_elf64_core_file_failing_signal 2219 (bfd *); 2220 extern bfd_boolean bfd_elf64_core_file_matches_executable_p 2221 (bfd *, bfd *); 2222 extern int bfd_elf64_core_file_pid 2223 (bfd *); 2224 2225 extern bfd_boolean bfd_elf64_swap_symbol_in 2226 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2227 extern void bfd_elf64_swap_symbol_out 2228 (bfd *, const Elf_Internal_Sym *, void *, void *); 2229 extern void bfd_elf64_swap_reloc_in 2230 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2231 extern void bfd_elf64_swap_reloc_out 2232 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2233 extern void bfd_elf64_swap_reloca_in 2234 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2235 extern void bfd_elf64_swap_reloca_out 2236 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2237 extern void bfd_elf64_swap_phdr_in 2238 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *); 2239 extern void bfd_elf64_swap_phdr_out 2240 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *); 2241 extern void bfd_elf64_swap_dyn_in 2242 (bfd *, const void *, Elf_Internal_Dyn *); 2243 extern void bfd_elf64_swap_dyn_out 2244 (bfd *, const Elf_Internal_Dyn *, void *); 2245 extern long bfd_elf64_slurp_symbol_table 2246 (bfd *, asymbol **, bfd_boolean); 2247 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr 2248 (bfd *); 2249 extern int bfd_elf64_write_out_phdrs 2250 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2251 extern bfd_boolean bfd_elf64_checksum_contents 2252 (bfd * , void (*) (const void *, size_t, void *), void *); 2253 extern void bfd_elf64_write_relocs 2254 (bfd *, asection *, void *); 2255 extern bfd_boolean bfd_elf64_slurp_reloc_table 2256 (bfd *, asection *, asymbol **, bfd_boolean); 2257 2258 extern bfd_boolean _bfd_elf_default_relocs_compatible 2259 (const bfd_target *, const bfd_target *); 2260 2261 extern bfd_boolean _bfd_elf_relocs_compatible 2262 (const bfd_target *, const bfd_target *); 2263 extern bfd_boolean _bfd_elf_notice_as_needed 2264 (bfd *, struct bfd_link_info *, enum notice_asneeded_action); 2265 2266 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup 2267 (bfd *, struct bfd_link_info *, const char *); 2268 extern bfd_boolean bfd_elf_link_add_symbols 2269 (bfd *, struct bfd_link_info *); 2270 extern bfd_boolean _bfd_elf_add_dynamic_entry 2271 (struct bfd_link_info *, bfd_vma, bfd_vma); 2272 extern bfd_boolean _bfd_elf_link_check_relocs 2273 (bfd *, struct bfd_link_info *); 2274 2275 extern bfd_boolean bfd_elf_link_record_dynamic_symbol 2276 (struct bfd_link_info *, struct elf_link_hash_entry *); 2277 2278 extern int bfd_elf_link_record_local_dynamic_symbol 2279 (struct bfd_link_info *, bfd *, long); 2280 2281 extern bfd_boolean _bfd_elf_close_and_cleanup 2282 (bfd *); 2283 2284 extern bfd_boolean _bfd_elf_common_definition 2285 (Elf_Internal_Sym *); 2286 2287 extern unsigned int _bfd_elf_common_section_index 2288 (asection *); 2289 2290 extern asection *_bfd_elf_common_section 2291 (asection *); 2292 2293 extern bfd_vma _bfd_elf_default_got_elt_size 2294 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *, 2295 unsigned long); 2296 2297 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn 2298 (bfd *, arelent *, struct bfd_symbol *, void *, 2299 asection *, bfd *, char **); 2300 2301 extern bfd_boolean bfd_elf_final_link 2302 (bfd *, struct bfd_link_info *); 2303 2304 extern void _bfd_elf_gc_keep 2305 (struct bfd_link_info *info); 2306 2307 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol 2308 (struct elf_link_hash_entry *h, void *inf); 2309 2310 extern bfd_boolean bfd_elf_gc_sections 2311 (bfd *, struct bfd_link_info *); 2312 2313 extern bfd_boolean bfd_elf_gc_record_vtinherit 2314 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2315 2316 extern bfd_boolean bfd_elf_gc_record_vtentry 2317 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2318 2319 extern asection *_bfd_elf_gc_mark_hook 2320 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 2321 struct elf_link_hash_entry *, Elf_Internal_Sym *); 2322 2323 extern asection *_bfd_elf_gc_mark_rsec 2324 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2325 struct elf_reloc_cookie *, bfd_boolean *); 2326 2327 extern bfd_boolean _bfd_elf_gc_mark_reloc 2328 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2329 struct elf_reloc_cookie *); 2330 2331 extern bfd_boolean _bfd_elf_gc_mark_fdes 2332 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn, 2333 struct elf_reloc_cookie *); 2334 2335 extern bfd_boolean _bfd_elf_gc_mark 2336 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn); 2337 2338 extern bfd_boolean _bfd_elf_gc_mark_extra_sections 2339 (struct bfd_link_info *, elf_gc_mark_hook_fn); 2340 2341 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets 2342 (bfd *, struct bfd_link_info *); 2343 2344 extern bfd_boolean bfd_elf_gc_common_final_link 2345 (bfd *, struct bfd_link_info *); 2346 2347 extern asection *_bfd_elf_is_start_stop 2348 (const struct bfd_link_info *, struct elf_link_hash_entry *); 2349 2350 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p 2351 (bfd_vma, void *); 2352 2353 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment 2354 (bfd *, asection *); 2355 2356 extern bfd_boolean _bfd_elf_map_sections_to_segments 2357 (bfd *, struct bfd_link_info *); 2358 2359 extern bfd_boolean _bfd_elf_is_function_type (unsigned int); 2360 2361 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *, 2362 bfd_vma *); 2363 2364 extern asection *_bfd_elf_get_reloc_section (asection *); 2365 2366 extern int bfd_elf_get_default_section_type (flagword); 2367 2368 extern bfd_boolean bfd_elf_lookup_section_flags 2369 (struct bfd_link_info *, struct flag_info *, asection *); 2370 2371 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section 2372 (bfd * abfd, asection * section); 2373 2374 /* PowerPC @tls opcode transform/validate. */ 2375 extern unsigned int _bfd_elf_ppc_at_tls_transform 2376 (unsigned int, unsigned int); 2377 /* PowerPC @tprel opcode transform/validate. */ 2378 extern unsigned int _bfd_elf_ppc_at_tprel_transform 2379 (unsigned int, unsigned int); 2380 /* PowerPC elf_object_p tweak. */ 2381 extern bfd_boolean _bfd_elf_ppc_set_arch (bfd *); 2382 /* PowerPC .gnu.attributes handling common to both 32-bit and 64-bit. */ 2383 extern void _bfd_elf_ppc_merge_fp_attributes (bfd *, bfd *); 2384 2385 /* Exported interface for writing elf corefile notes. */ 2386 extern char *elfcore_write_note 2387 (bfd *, char *, int *, const char *, int, const void *, int); 2388 extern char *elfcore_write_prpsinfo 2389 (bfd *, char *, int *, const char *, const char *); 2390 extern char *elfcore_write_prstatus 2391 (bfd *, char *, int *, long, int, const void *); 2392 extern char * elfcore_write_pstatus 2393 (bfd *, char *, int *, long, int, const void *); 2394 extern char *elfcore_write_prfpreg 2395 (bfd *, char *, int *, const void *, int); 2396 extern char *elfcore_write_prxfpreg 2397 (bfd *, char *, int *, const void *, int); 2398 extern char *elfcore_write_xstatereg 2399 (bfd *, char *, int *, const void *, int); 2400 extern char *elfcore_write_ppc_vmx 2401 (bfd *, char *, int *, const void *, int); 2402 extern char *elfcore_write_ppc_vsx 2403 (bfd *, char *, int *, const void *, int); 2404 extern char *elfcore_write_s390_timer 2405 (bfd *, char *, int *, const void *, int); 2406 extern char *elfcore_write_s390_todcmp 2407 (bfd *, char *, int *, const void *, int); 2408 extern char *elfcore_write_s390_todpreg 2409 (bfd *, char *, int *, const void *, int); 2410 extern char *elfcore_write_s390_ctrs 2411 (bfd *, char *, int *, const void *, int); 2412 extern char *elfcore_write_s390_prefix 2413 (bfd *, char *, int *, const void *, int); 2414 extern char *elfcore_write_s390_last_break 2415 (bfd *, char *, int *, const void *, int); 2416 extern char *elfcore_write_s390_system_call 2417 (bfd *, char *, int *, const void *, int); 2418 extern char *elfcore_write_s390_tdb 2419 (bfd *, char *, int *, const void *, int); 2420 extern char *elfcore_write_s390_vxrs_low 2421 (bfd *, char *, int *, const void *, int); 2422 extern char *elfcore_write_s390_vxrs_high 2423 (bfd *, char *, int *, const void *, int); 2424 extern char *elfcore_write_arm_vfp 2425 (bfd *, char *, int *, const void *, int); 2426 extern char *elfcore_write_aarch_tls 2427 (bfd *, char *, int *, const void *, int); 2428 extern char *elfcore_write_aarch_hw_break 2429 (bfd *, char *, int *, const void *, int); 2430 extern char *elfcore_write_aarch_hw_watch 2431 (bfd *, char *, int *, const void *, int); 2432 extern char *elfcore_write_lwpstatus 2433 (bfd *, char *, int *, long, int, const void *); 2434 extern char *elfcore_write_register_note 2435 (bfd *, char *, int *, const char *, const void *, int); 2436 2437 /* Internal structure which holds information to be included in the 2438 PRPSINFO section of Linux core files. 2439 2440 This is an "internal" structure in the sense that it should be used 2441 to pass information to BFD (via the `elfcore_write_linux_prpsinfo' 2442 function), so things like endianess shouldn't be an issue. This 2443 structure will eventually be converted in one of the 2444 `elf_external_linux_*' structures and written out to an output bfd 2445 by one of the functions declared below. */ 2446 2447 struct elf_internal_linux_prpsinfo 2448 { 2449 char pr_state; /* Numeric process state. */ 2450 char pr_sname; /* Char for pr_state. */ 2451 char pr_zomb; /* Zombie. */ 2452 char pr_nice; /* Nice val. */ 2453 unsigned long pr_flag; /* Flags. */ 2454 unsigned int pr_uid; 2455 unsigned int pr_gid; 2456 int pr_pid, pr_ppid, pr_pgrp, pr_sid; 2457 char pr_fname[16 + 1]; /* Filename of executable. */ 2458 char pr_psargs[80 + 1]; /* Initial part of arg list. */ 2459 }; 2460 2461 /* Linux/most 32-bit archs. */ 2462 extern char *elfcore_write_linux_prpsinfo32 2463 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2464 2465 /* Linux/most 64-bit archs. */ 2466 extern char *elfcore_write_linux_prpsinfo64 2467 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2468 2469 /* Linux/PPC32 uses different layout compared to most archs. */ 2470 extern char *elfcore_write_ppc_linux_prpsinfo32 2471 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2472 2473 extern bfd *_bfd_elf32_bfd_from_remote_memory 2474 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 2475 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2476 extern bfd *_bfd_elf64_bfd_from_remote_memory 2477 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 2478 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2479 2480 extern bfd_vma bfd_elf_obj_attr_size (bfd *); 2481 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma); 2482 extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int); 2483 extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int); 2484 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \ 2485 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2486 extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *); 2487 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \ 2488 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2489 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int, 2490 unsigned int, const char *); 2491 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \ 2492 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \ 2493 (INTVAL), (STRVAL)) 2494 2495 extern char *_bfd_elf_attr_strdup (bfd *, const char *); 2496 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *); 2497 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int); 2498 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *); 2499 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *); 2500 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int); 2501 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *); 2502 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec); 2503 2504 /* The linker may need to keep track of the number of relocs that it 2505 decides to copy as dynamic relocs in check_relocs for each symbol. 2506 This is so that it can later discard them if they are found to be 2507 unnecessary. We can store the information in a field extending the 2508 regular ELF linker hash table. */ 2509 2510 struct elf_dyn_relocs 2511 { 2512 struct elf_dyn_relocs *next; 2513 2514 /* The input section of the reloc. */ 2515 asection *sec; 2516 2517 /* Total number of relocs copied for the input section. */ 2518 bfd_size_type count; 2519 2520 /* Number of pc-relative relocs copied for the input section. */ 2521 bfd_size_type pc_count; 2522 }; 2523 2524 extern bfd_boolean _bfd_elf_create_ifunc_sections 2525 (bfd *, struct bfd_link_info *); 2526 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs 2527 (struct bfd_link_info *, struct elf_link_hash_entry *, 2528 struct elf_dyn_relocs **, bfd_boolean *, unsigned int, 2529 unsigned int, unsigned int, bfd_boolean); 2530 extern long _bfd_elf_ifunc_get_synthetic_symtab 2531 (bfd *, long, asymbol **, long, asymbol **, asymbol **, asection *, 2532 bfd_vma *(*) (bfd *, asymbol **, asection *, asection *)); 2533 2534 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *); 2535 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *); 2536 2537 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma); 2538 extern bfd_vma elf64_r_sym (bfd_vma); 2539 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma); 2540 extern bfd_vma elf32_r_sym (bfd_vma); 2541 2542 /* Large common section. */ 2543 extern asection _bfd_elf_large_com_section; 2544 2545 /* Hash for local symbol with the first section id, ID, in the input 2546 file and the local symbol index, SYM. */ 2547 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \ 2548 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \ 2549 ^ (SYM) ^ ((ID) >> 16)) 2550 2551 /* This is the condition under which finish_dynamic_symbol will be called. 2552 If our finish_dynamic_symbol isn't called, we'll need to do something 2553 about initializing any .plt and .got entries in relocate_section. */ 2554 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \ 2555 ((DYN) \ 2556 && ((SHARED) || !(H)->forced_local) \ 2557 && ((H)->dynindx != -1 || (H)->forced_local)) 2558 2559 /* This macro is to avoid lots of duplicated code in the body 2560 of xxx_relocate_section() in the various elfxx-xxxx.c files. */ 2561 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \ 2562 r_symndx, symtab_hdr, sym_hashes, \ 2563 h, sec, relocation, \ 2564 unresolved_reloc, warned, ignored) \ 2565 do \ 2566 { \ 2567 /* It seems this can happen with erroneous or unsupported \ 2568 input (mixing a.out and elf in an archive, for example.) */ \ 2569 if (sym_hashes == NULL) \ 2570 return FALSE; \ 2571 \ 2572 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \ 2573 \ 2574 if (info->wrap_hash != NULL \ 2575 && (input_section->flags & SEC_DEBUGGING) != 0) \ 2576 h = ((struct elf_link_hash_entry *) \ 2577 unwrap_hash_lookup (info, input_bfd, &h->root)); \ 2578 \ 2579 while (h->root.type == bfd_link_hash_indirect \ 2580 || h->root.type == bfd_link_hash_warning) \ 2581 h = (struct elf_link_hash_entry *) h->root.u.i.link; \ 2582 \ 2583 warned = FALSE; \ 2584 ignored = FALSE; \ 2585 unresolved_reloc = FALSE; \ 2586 relocation = 0; \ 2587 if (h->root.type == bfd_link_hash_defined \ 2588 || h->root.type == bfd_link_hash_defweak) \ 2589 { \ 2590 sec = h->root.u.def.section; \ 2591 if (sec == NULL \ 2592 || sec->output_section == NULL) \ 2593 /* Set a flag that will be cleared later if we find a \ 2594 relocation value for this symbol. output_section \ 2595 is typically NULL for symbols satisfied by a shared \ 2596 library. */ \ 2597 unresolved_reloc = TRUE; \ 2598 else \ 2599 relocation = (h->root.u.def.value \ 2600 + sec->output_section->vma \ 2601 + sec->output_offset); \ 2602 } \ 2603 else if (h->root.type == bfd_link_hash_undefweak) \ 2604 ; \ 2605 else if (info->unresolved_syms_in_objects == RM_IGNORE \ 2606 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \ 2607 ignored = TRUE; \ 2608 else if (!bfd_link_relocatable (info)) \ 2609 { \ 2610 bfd_boolean err; \ 2611 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \ 2612 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \ 2613 (*info->callbacks->undefined_symbol) (info, \ 2614 h->root.root.string, \ 2615 input_bfd, \ 2616 input_section, \ 2617 rel->r_offset, err); \ 2618 warned = TRUE; \ 2619 } \ 2620 (void) unresolved_reloc; \ 2621 (void) warned; \ 2622 (void) ignored; \ 2623 } \ 2624 while (0) 2625 2626 /* This macro is to avoid lots of duplicated code in the body of the 2627 loop over relocations in xxx_relocate_section() in the various 2628 elfxx-xxxx.c files. 2629 2630 Handle relocations against symbols from removed linkonce sections, 2631 or sections discarded by a linker script. When doing a relocatable 2632 link, we remove such relocations. Otherwise, we just want the 2633 section contents zeroed and avoid any special processing. */ 2634 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \ 2635 rel, count, relend, \ 2636 howto, index, contents) \ 2637 { \ 2638 int i_; \ 2639 _bfd_clear_contents (howto, input_bfd, input_section, \ 2640 contents + rel[index].r_offset); \ 2641 \ 2642 if (bfd_link_relocatable (info) \ 2643 && (input_section->flags & SEC_DEBUGGING)) \ 2644 { \ 2645 /* Only remove relocations in debug sections since other \ 2646 sections may require relocations. */ \ 2647 Elf_Internal_Shdr *rel_hdr; \ 2648 \ 2649 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \ 2650 \ 2651 /* Avoid empty output section. */ \ 2652 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \ 2653 { \ 2654 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 2655 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \ 2656 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 2657 \ 2658 memmove (rel, rel + count, \ 2659 (relend - rel - count) * sizeof (*rel)); \ 2660 \ 2661 input_section->reloc_count--; \ 2662 relend -= count; \ 2663 rel--; \ 2664 continue; \ 2665 } \ 2666 } \ 2667 \ 2668 for (i_ = 0; i_ < count; i_++) \ 2669 { \ 2670 rel[i_].r_info = 0; \ 2671 rel[i_].r_addend = 0; \ 2672 } \ 2673 rel += count - 1; \ 2674 continue; \ 2675 } 2676 2677 /* Will a symbol be bound to the definition within the shared 2678 library, if any. A unique symbol can never be bound locally. */ 2679 #define SYMBOLIC_BIND(INFO, H) \ 2680 (!(H)->unique_global \ 2681 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))) 2682 2683 #ifdef __cplusplus 2684 } 2685 #endif 2686 #endif /* _LIBELF_H_ */ 2687