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_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). */ 1562 1563 typedef struct obj_attribute 1564 { 1565 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0) 1566 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1) 1567 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2) 1568 1569 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL) 1570 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL) 1571 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT) 1572 1573 int type; 1574 unsigned int i; 1575 char *s; 1576 } obj_attribute; 1577 1578 typedef struct obj_attribute_list 1579 { 1580 struct obj_attribute_list *next; 1581 unsigned int tag; 1582 obj_attribute attr; 1583 } obj_attribute_list; 1584 1585 /* Object attributes may either be defined by the processor ABI, index 1586 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific 1587 (and possibly also processor-specific), index OBJ_ATTR_GNU. */ 1588 #define OBJ_ATTR_PROC 0 1589 #define OBJ_ATTR_GNU 1 1590 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC 1591 #define OBJ_ATTR_LAST OBJ_ATTR_GNU 1592 1593 /* The following object attribute tags are taken as generic, for all 1594 targets and for "gnu" where there is no target standard. */ 1595 enum 1596 { 1597 Tag_NULL = 0, 1598 Tag_File = 1, 1599 Tag_Section = 2, 1600 Tag_Symbol = 3, 1601 Tag_compatibility = 32 1602 }; 1603 1604 /* The following struct stores information about every SystemTap section 1605 found in the object file. */ 1606 struct sdt_note 1607 { 1608 struct sdt_note *next; 1609 bfd_size_type size; 1610 bfd_byte data[1]; 1611 }; 1612 1613 /* tdata information grabbed from an elf core file. */ 1614 struct core_elf_obj_tdata 1615 { 1616 int signal; 1617 int pid; 1618 int lwpid; 1619 char* program; 1620 char* command; 1621 }; 1622 1623 /* Extra tdata information held for output ELF BFDs. */ 1624 struct output_elf_obj_tdata 1625 { 1626 struct elf_segment_map *seg_map; 1627 struct elf_strtab_hash *strtab_ptr; 1628 1629 /* STT_SECTION symbols for each section */ 1630 asymbol **section_syms; 1631 1632 /* Used to determine if PT_GNU_EH_FRAME segment header should be 1633 created. */ 1634 asection *eh_frame_hdr; 1635 1636 /* NT_GNU_BUILD_ID note type info. */ 1637 struct 1638 { 1639 bfd_boolean (*after_write_object_contents) (bfd *); 1640 const char *style; 1641 asection *sec; 1642 } build_id; 1643 1644 /* Records the result of `get_program_header_size'. */ 1645 bfd_size_type program_header_size; 1646 1647 /* Used when laying out sections. */ 1648 file_ptr next_file_pos; 1649 1650 int num_section_syms; 1651 unsigned int shstrtab_section, strtab_section; 1652 1653 /* Segment flags for the PT_GNU_STACK segment. */ 1654 unsigned int stack_flags; 1655 1656 /* This is set to TRUE if the object was created by the backend 1657 linker. */ 1658 bfd_boolean linker; 1659 1660 /* Used to determine if the e_flags field has been initialized */ 1661 bfd_boolean flags_init; 1662 }; 1663 1664 /* Indicate if the bfd contains symbols that have the STT_GNU_IFUNC 1665 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi 1666 field in the ELF header structure. */ 1667 enum elf_gnu_symbols 1668 { 1669 elf_gnu_symbol_none = 0, 1670 elf_gnu_symbol_any = 1 << 0, 1671 elf_gnu_symbol_ifunc = (elf_gnu_symbol_any | 1 << 1), 1672 elf_gnu_symbol_unique = (elf_gnu_symbol_any | 1 << 2), 1673 elf_gnu_symbol_all = (elf_gnu_symbol_ifunc | elf_gnu_symbol_unique) 1674 }; 1675 1676 typedef struct elf_section_list 1677 { 1678 Elf_Internal_Shdr hdr; 1679 unsigned int ndx; 1680 struct elf_section_list * next; 1681 } elf_section_list; 1682 1683 1684 /* Some private data is stashed away for future use using the tdata pointer 1685 in the bfd structure. */ 1686 1687 struct elf_obj_tdata 1688 { 1689 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */ 1690 Elf_Internal_Shdr **elf_sect_ptr; 1691 Elf_Internal_Phdr *phdr; 1692 Elf_Internal_Shdr symtab_hdr; 1693 Elf_Internal_Shdr shstrtab_hdr; 1694 Elf_Internal_Shdr strtab_hdr; 1695 Elf_Internal_Shdr dynsymtab_hdr; 1696 Elf_Internal_Shdr dynstrtab_hdr; 1697 Elf_Internal_Shdr dynversym_hdr; 1698 Elf_Internal_Shdr dynverref_hdr; 1699 Elf_Internal_Shdr dynverdef_hdr; 1700 elf_section_list * symtab_shndx_list; 1701 bfd_vma gp; /* The gp value */ 1702 unsigned int gp_size; /* The gp size */ 1703 unsigned int num_elf_sections; /* elf_sect_ptr size */ 1704 1705 /* A mapping from external symbols to entries in the linker hash 1706 table, used when linking. This is indexed by the symbol index 1707 minus the sh_info field of the symbol table header. */ 1708 struct elf_link_hash_entry **sym_hashes; 1709 1710 /* Track usage and final offsets of GOT entries for local symbols. 1711 This array is indexed by symbol index. Elements are used 1712 identically to "got" in struct elf_link_hash_entry. */ 1713 union 1714 { 1715 bfd_signed_vma *refcounts; 1716 bfd_vma *offsets; 1717 struct got_entry **ents; 1718 } local_got; 1719 1720 /* The linker ELF emulation code needs to let the backend ELF linker 1721 know what filename should be used for a dynamic object if the 1722 dynamic object is found using a search. The emulation code then 1723 sometimes needs to know what name was actually used. Until the 1724 file has been added to the linker symbol table, this field holds 1725 the name the linker wants. After it has been added, it holds the 1726 name actually used, which will be the DT_SONAME entry if there is 1727 one. */ 1728 const char *dt_name; 1729 1730 /* The linker emulation needs to know what audit libs 1731 are used by a dynamic object. */ 1732 const char *dt_audit; 1733 1734 /* Used by find_nearest_line entry point. */ 1735 void *line_info; 1736 1737 /* A place to stash dwarf1 info for this bfd. */ 1738 struct dwarf1_debug *dwarf1_find_line_info; 1739 1740 /* A place to stash dwarf2 info for this bfd. */ 1741 void *dwarf2_find_line_info; 1742 1743 /* Stash away info for yet another find line/function variant. */ 1744 void *elf_find_function_cache; 1745 1746 /* Number of symbol version definitions we are about to emit. */ 1747 unsigned int cverdefs; 1748 1749 /* Number of symbol version references we are about to emit. */ 1750 unsigned int cverrefs; 1751 1752 /* Symbol version definitions in external objects. */ 1753 Elf_Internal_Verdef *verdef; 1754 1755 /* Symbol version references to external objects. */ 1756 Elf_Internal_Verneed *verref; 1757 1758 /* A pointer to the .eh_frame section. */ 1759 asection *eh_frame_section; 1760 1761 /* Symbol buffer. */ 1762 void *symbuf; 1763 1764 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES]; 1765 obj_attribute_list *other_obj_attributes[2]; 1766 1767 /* Linked-list containing information about every Systemtap section 1768 found in the object file. Each section corresponds to one entry 1769 in the list. */ 1770 struct sdt_note *sdt_note_head; 1771 1772 Elf_Internal_Shdr **group_sect_ptr; 1773 int num_group; 1774 1775 unsigned int symtab_section, dynsymtab_section; 1776 unsigned int dynversym_section, dynverdef_section, dynverref_section; 1777 1778 /* An identifier used to distinguish different target 1779 specific extensions to this structure. */ 1780 enum elf_target_id object_id; 1781 1782 /* Whether a dyanmic object was specified normally on the linker 1783 command line, or was specified when --as-needed was in effect, 1784 or was found via a DT_NEEDED entry. */ 1785 enum dynamic_lib_link_class dyn_lib_class; 1786 1787 /* Irix 5 often screws up the symbol table, sorting local symbols 1788 after global symbols. This flag is set if the symbol table in 1789 this BFD appears to be screwed up. If it is, we ignore the 1790 sh_info field in the symbol table header, and always read all the 1791 symbols. */ 1792 bfd_boolean bad_symtab; 1793 1794 enum elf_gnu_symbols has_gnu_symbols; 1795 1796 /* Information grabbed from an elf core file. */ 1797 struct core_elf_obj_tdata *core; 1798 1799 /* More information held for output ELF BFDs. */ 1800 struct output_elf_obj_tdata *o; 1801 }; 1802 1803 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data) 1804 1805 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id) 1806 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size) 1807 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header) 1808 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr) 1809 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections) 1810 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map) 1811 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos) 1812 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr) 1813 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker) 1814 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags) 1815 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr) 1816 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section) 1817 #define elf_symtab_shndx_list(bfd) (elf_tdata(bfd) -> symtab_shndx_list) 1818 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section) 1819 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section) 1820 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr) 1821 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section) 1822 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section) 1823 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section) 1824 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section) 1825 #define elf_eh_frame_section(bfd) \ 1826 (elf_tdata(bfd) -> eh_frame_section) 1827 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms) 1828 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms) 1829 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo) 1830 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus) 1831 #define elf_gp(bfd) (elf_tdata(bfd) -> gp) 1832 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size) 1833 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes) 1834 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts) 1835 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets) 1836 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents) 1837 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name) 1838 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit) 1839 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class) 1840 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab) 1841 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init) 1842 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes) 1843 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes) 1844 #define elf_known_obj_attributes_proc(bfd) \ 1845 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1846 #define elf_other_obj_attributes_proc(bfd) \ 1847 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1848 1849 extern void _bfd_elf_swap_verdef_in 1850 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *); 1851 extern void _bfd_elf_swap_verdef_out 1852 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *); 1853 extern void _bfd_elf_swap_verdaux_in 1854 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *); 1855 extern void _bfd_elf_swap_verdaux_out 1856 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *); 1857 extern void _bfd_elf_swap_verneed_in 1858 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *); 1859 extern void _bfd_elf_swap_verneed_out 1860 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *); 1861 extern void _bfd_elf_swap_vernaux_in 1862 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *); 1863 extern void _bfd_elf_swap_vernaux_out 1864 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *); 1865 extern void _bfd_elf_swap_versym_in 1866 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *); 1867 extern void _bfd_elf_swap_versym_out 1868 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *); 1869 1870 extern unsigned int _bfd_elf_section_from_bfd_section 1871 (bfd *, asection *); 1872 extern char *bfd_elf_string_from_elf_section 1873 (bfd *, unsigned, unsigned); 1874 extern Elf_Internal_Sym *bfd_elf_get_elf_syms 1875 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *, 1876 Elf_External_Sym_Shndx *); 1877 extern const char *bfd_elf_sym_name 1878 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *); 1879 1880 extern bfd_boolean _bfd_elf_copy_private_bfd_data 1881 (bfd *, bfd *); 1882 extern bfd_boolean _bfd_elf_print_private_bfd_data 1883 (bfd *, void *); 1884 const char * _bfd_elf_get_symbol_version_string 1885 (bfd *, asymbol *, bfd_boolean *); 1886 extern void bfd_elf_print_symbol 1887 (bfd *, void *, asymbol *, bfd_print_symbol_type); 1888 1889 extern unsigned int _bfd_elf_eh_frame_address_size 1890 (bfd *, asection *); 1891 extern bfd_byte _bfd_elf_encode_eh_address 1892 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset, 1893 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded); 1894 extern bfd_boolean _bfd_elf_can_make_relative 1895 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section); 1896 1897 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class 1898 (const struct bfd_link_info *, const asection *, 1899 const Elf_Internal_Rela *); 1900 extern bfd_vma _bfd_elf_rela_local_sym 1901 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *); 1902 extern bfd_vma _bfd_elf_rel_local_sym 1903 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma); 1904 extern bfd_vma _bfd_elf_section_offset 1905 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1906 1907 extern unsigned long bfd_elf_hash 1908 (const char *); 1909 extern unsigned long bfd_elf_gnu_hash 1910 (const char *); 1911 1912 extern bfd_reloc_status_type bfd_elf_generic_reloc 1913 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 1914 extern bfd_boolean bfd_elf_allocate_object 1915 (bfd *, size_t, enum elf_target_id); 1916 extern bfd_boolean bfd_elf_make_object 1917 (bfd *); 1918 extern bfd_boolean bfd_elf_mkcorefile 1919 (bfd *); 1920 extern bfd_boolean _bfd_elf_make_section_from_shdr 1921 (bfd *, Elf_Internal_Shdr *, const char *, int); 1922 extern bfd_boolean _bfd_elf_make_section_from_phdr 1923 (bfd *, Elf_Internal_Phdr *, int, const char *); 1924 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc 1925 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 1926 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create 1927 (bfd *); 1928 extern void _bfd_elf_link_hash_table_free 1929 (bfd *); 1930 extern void _bfd_elf_link_hash_copy_indirect 1931 (struct bfd_link_info *, struct elf_link_hash_entry *, 1932 struct elf_link_hash_entry *); 1933 extern void _bfd_elf_link_hash_hide_symbol 1934 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1935 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol 1936 (struct bfd_link_info *, struct elf_link_hash_entry *); 1937 extern bfd_boolean _bfd_elf_link_hash_table_init 1938 (struct elf_link_hash_table *, bfd *, 1939 struct bfd_hash_entry *(*) 1940 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *), 1941 unsigned int, enum elf_target_id); 1942 extern bfd_boolean _bfd_elf_slurp_version_tables 1943 (bfd *, bfd_boolean); 1944 extern bfd_boolean _bfd_elf_merge_sections 1945 (bfd *, struct bfd_link_info *); 1946 extern bfd_boolean _bfd_elf_match_sections_by_type 1947 (bfd *, const asection *, bfd *, const asection *); 1948 extern bfd_boolean bfd_elf_is_group_section 1949 (bfd *, const struct bfd_section *); 1950 extern bfd_boolean _bfd_elf_section_already_linked 1951 (bfd *, asection *, struct bfd_link_info *); 1952 extern void bfd_elf_set_group_contents 1953 (bfd *, asection *, void *); 1954 extern asection *_bfd_elf_check_kept_section 1955 (asection *, struct bfd_link_info *); 1956 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms 1957 extern void _bfd_elf_copy_link_hash_symbol_type 1958 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *); 1959 extern bfd_boolean _bfd_elf_size_group_sections 1960 (struct bfd_link_info *); 1961 extern bfd_boolean _bfd_elf_fixup_group_sections 1962 (bfd *, asection *); 1963 extern bfd_boolean _bfd_elf_copy_private_header_data 1964 (bfd *, bfd *); 1965 extern bfd_boolean _bfd_elf_copy_private_symbol_data 1966 (bfd *, asymbol *, bfd *, asymbol *); 1967 #define _bfd_generic_init_private_section_data \ 1968 _bfd_elf_init_private_section_data 1969 extern bfd_boolean _bfd_elf_init_private_section_data 1970 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *); 1971 extern bfd_boolean _bfd_elf_copy_private_section_data 1972 (bfd *, asection *, bfd *, asection *); 1973 extern bfd_boolean _bfd_elf_write_object_contents 1974 (bfd *); 1975 extern bfd_boolean _bfd_elf_write_corefile_contents 1976 (bfd *); 1977 extern bfd_boolean _bfd_elf_set_section_contents 1978 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type); 1979 extern long _bfd_elf_get_symtab_upper_bound 1980 (bfd *); 1981 extern long _bfd_elf_canonicalize_symtab 1982 (bfd *, asymbol **); 1983 extern long _bfd_elf_get_dynamic_symtab_upper_bound 1984 (bfd *); 1985 extern long _bfd_elf_canonicalize_dynamic_symtab 1986 (bfd *, asymbol **); 1987 extern long _bfd_elf_get_synthetic_symtab 1988 (bfd *, long, asymbol **, long, asymbol **, asymbol **); 1989 extern long _bfd_elf_get_reloc_upper_bound 1990 (bfd *, sec_ptr); 1991 extern long _bfd_elf_canonicalize_reloc 1992 (bfd *, sec_ptr, arelent **, asymbol **); 1993 extern asection * _bfd_elf_get_dynamic_reloc_section 1994 (bfd *, asection *, bfd_boolean); 1995 extern asection * _bfd_elf_make_dynamic_reloc_section 1996 (asection *, bfd *, unsigned int, bfd *, bfd_boolean); 1997 extern long _bfd_elf_get_dynamic_reloc_upper_bound 1998 (bfd *); 1999 extern long _bfd_elf_canonicalize_dynamic_reloc 2000 (bfd *, arelent **, asymbol **); 2001 extern asymbol *_bfd_elf_make_empty_symbol 2002 (bfd *); 2003 extern void _bfd_elf_get_symbol_info 2004 (bfd *, asymbol *, symbol_info *); 2005 extern bfd_boolean _bfd_elf_is_local_label_name 2006 (bfd *, const char *); 2007 extern alent *_bfd_elf_get_lineno 2008 (bfd *, asymbol *); 2009 extern bfd_boolean _bfd_elf_set_arch_mach 2010 (bfd *, enum bfd_architecture, unsigned long); 2011 extern bfd_boolean _bfd_elf_find_nearest_line 2012 (bfd *, asymbol **, asection *, bfd_vma, 2013 const char **, const char **, unsigned int *, unsigned int *); 2014 extern bfd_boolean _bfd_elf_find_line 2015 (bfd *, asymbol **, asymbol *, const char **, unsigned int *); 2016 extern bfd_boolean _bfd_elf_find_inliner_info 2017 (bfd *, const char **, const char **, unsigned int *); 2018 extern asymbol *_bfd_elf_find_function 2019 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **); 2020 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols 2021 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 2022 extern int _bfd_elf_sizeof_headers 2023 (bfd *, struct bfd_link_info *); 2024 extern bfd_boolean _bfd_elf_new_section_hook 2025 (bfd *, asection *); 2026 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section 2027 (const char *, const struct bfd_elf_special_section *, unsigned int); 2028 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr 2029 (bfd *, asection *); 2030 2031 /* If the target doesn't have reloc handling written yet: */ 2032 extern void _bfd_elf_no_info_to_howto 2033 (bfd *, arelent *, Elf_Internal_Rela *); 2034 2035 extern bfd_boolean bfd_section_from_shdr 2036 (bfd *, unsigned int shindex); 2037 extern bfd_boolean bfd_section_from_phdr 2038 (bfd *, Elf_Internal_Phdr *, int); 2039 2040 extern int _bfd_elf_symbol_from_bfd_symbol 2041 (bfd *, asymbol **); 2042 2043 extern Elf_Internal_Sym *bfd_sym_from_r_symndx 2044 (struct sym_cache *, bfd *, unsigned long); 2045 extern asection *bfd_section_from_elf_index 2046 (bfd *, unsigned int); 2047 2048 extern struct elf_strtab_hash * _bfd_elf_strtab_init 2049 (void); 2050 extern void _bfd_elf_strtab_free 2051 (struct elf_strtab_hash *); 2052 extern size_t _bfd_elf_strtab_add 2053 (struct elf_strtab_hash *, const char *, bfd_boolean); 2054 extern void _bfd_elf_strtab_addref 2055 (struct elf_strtab_hash *, size_t); 2056 extern void _bfd_elf_strtab_delref 2057 (struct elf_strtab_hash *, size_t); 2058 extern unsigned int _bfd_elf_strtab_refcount 2059 (struct elf_strtab_hash *, size_t); 2060 extern void _bfd_elf_strtab_clear_all_refs 2061 (struct elf_strtab_hash *); 2062 extern void *_bfd_elf_strtab_save 2063 (struct elf_strtab_hash *); 2064 extern void _bfd_elf_strtab_restore 2065 (struct elf_strtab_hash *, void *); 2066 extern bfd_size_type _bfd_elf_strtab_size 2067 (struct elf_strtab_hash *); 2068 extern bfd_size_type _bfd_elf_strtab_offset 2069 (struct elf_strtab_hash *, size_t); 2070 extern bfd_boolean _bfd_elf_strtab_emit 2071 (bfd *, struct elf_strtab_hash *); 2072 extern void _bfd_elf_strtab_finalize 2073 (struct elf_strtab_hash *); 2074 2075 extern bfd_boolean bfd_elf_parse_eh_frame_entries 2076 (bfd *, struct bfd_link_info *); 2077 extern bfd_boolean _bfd_elf_parse_eh_frame_entry 2078 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *); 2079 extern void _bfd_elf_parse_eh_frame 2080 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *); 2081 extern bfd_boolean _bfd_elf_end_eh_frame_parsing 2082 (struct bfd_link_info *info); 2083 2084 extern bfd_boolean _bfd_elf_discard_section_eh_frame 2085 (bfd *, struct bfd_link_info *, asection *, 2086 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *); 2087 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr 2088 (bfd *, struct bfd_link_info *); 2089 extern bfd_vma _bfd_elf_eh_frame_section_offset 2090 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 2091 extern bfd_boolean _bfd_elf_write_section_eh_frame 2092 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 2093 bfd_boolean _bfd_elf_write_section_eh_frame_entry 2094 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 2095 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *); 2096 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr 2097 (bfd *, struct bfd_link_info *); 2098 extern bfd_boolean _bfd_elf_eh_frame_present 2099 (struct bfd_link_info *); 2100 extern bfd_boolean _bfd_elf_eh_frame_entry_present 2101 (struct bfd_link_info *); 2102 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr 2103 (struct bfd_link_info *); 2104 2105 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *); 2106 2107 extern long _bfd_elf_link_lookup_local_dynindx 2108 (struct bfd_link_info *, bfd *, long); 2109 extern bfd_boolean _bfd_elf_compute_section_file_positions 2110 (bfd *, struct bfd_link_info *); 2111 extern file_ptr _bfd_elf_assign_file_position_for_section 2112 (Elf_Internal_Shdr *, file_ptr, bfd_boolean); 2113 2114 extern bfd_boolean _bfd_elf_validate_reloc 2115 (bfd *, arelent *); 2116 2117 extern bfd_boolean _bfd_elf_link_create_dynamic_sections 2118 (bfd *, struct bfd_link_info *); 2119 extern bfd_boolean _bfd_elf_link_omit_section_dynsym 2120 (bfd *, struct bfd_link_info *, asection *); 2121 extern bfd_boolean _bfd_elf_create_dynamic_sections 2122 (bfd *, struct bfd_link_info *); 2123 extern bfd_boolean _bfd_elf_create_got_section 2124 (bfd *, struct bfd_link_info *); 2125 extern asection *_bfd_elf_section_for_symbol 2126 (struct elf_reloc_cookie *, unsigned long, bfd_boolean); 2127 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym 2128 (bfd *, struct bfd_link_info *, asection *, const char *); 2129 extern void _bfd_elf_init_1_index_section 2130 (bfd *, struct bfd_link_info *); 2131 extern void _bfd_elf_init_2_index_sections 2132 (bfd *, struct bfd_link_info *); 2133 2134 extern bfd_boolean _bfd_elfcore_make_pseudosection 2135 (bfd *, char *, size_t, ufile_ptr); 2136 extern char *_bfd_elfcore_strndup 2137 (bfd *, char *, size_t); 2138 2139 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs 2140 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean); 2141 2142 extern bfd_boolean _bfd_elf_link_output_relocs 2143 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 2144 struct elf_link_hash_entry **); 2145 2146 extern bfd_boolean _bfd_elf_adjust_dynamic_copy 2147 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *); 2148 2149 extern bfd_boolean _bfd_elf_dynamic_symbol_p 2150 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2151 2152 extern bfd_boolean _bfd_elf_symbol_refs_local_p 2153 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2154 2155 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation 2156 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma); 2157 2158 extern bfd_boolean _bfd_elf_setup_sections 2159 (bfd *); 2160 2161 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *); 2162 2163 extern const bfd_target *bfd_elf32_object_p 2164 (bfd *); 2165 extern const bfd_target *bfd_elf32_core_file_p 2166 (bfd *); 2167 extern char *bfd_elf32_core_file_failing_command 2168 (bfd *); 2169 extern int bfd_elf32_core_file_failing_signal 2170 (bfd *); 2171 extern bfd_boolean bfd_elf32_core_file_matches_executable_p 2172 (bfd *, bfd *); 2173 extern int bfd_elf32_core_file_pid 2174 (bfd *); 2175 2176 extern bfd_boolean bfd_elf32_swap_symbol_in 2177 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2178 extern void bfd_elf32_swap_symbol_out 2179 (bfd *, const Elf_Internal_Sym *, void *, void *); 2180 extern void bfd_elf32_swap_reloc_in 2181 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2182 extern void bfd_elf32_swap_reloc_out 2183 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2184 extern void bfd_elf32_swap_reloca_in 2185 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2186 extern void bfd_elf32_swap_reloca_out 2187 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2188 extern void bfd_elf32_swap_phdr_in 2189 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *); 2190 extern void bfd_elf32_swap_phdr_out 2191 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *); 2192 extern void bfd_elf32_swap_dyn_in 2193 (bfd *, const void *, Elf_Internal_Dyn *); 2194 extern void bfd_elf32_swap_dyn_out 2195 (bfd *, const Elf_Internal_Dyn *, void *); 2196 extern long bfd_elf32_slurp_symbol_table 2197 (bfd *, asymbol **, bfd_boolean); 2198 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr 2199 (bfd *); 2200 extern int bfd_elf32_write_out_phdrs 2201 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2202 extern bfd_boolean bfd_elf32_checksum_contents 2203 (bfd * , void (*) (const void *, size_t, void *), void *); 2204 extern void bfd_elf32_write_relocs 2205 (bfd *, asection *, void *); 2206 extern bfd_boolean bfd_elf32_slurp_reloc_table 2207 (bfd *, asection *, asymbol **, bfd_boolean); 2208 2209 extern const bfd_target *bfd_elf64_object_p 2210 (bfd *); 2211 extern const bfd_target *bfd_elf64_core_file_p 2212 (bfd *); 2213 extern char *bfd_elf64_core_file_failing_command 2214 (bfd *); 2215 extern int bfd_elf64_core_file_failing_signal 2216 (bfd *); 2217 extern bfd_boolean bfd_elf64_core_file_matches_executable_p 2218 (bfd *, bfd *); 2219 extern int bfd_elf64_core_file_pid 2220 (bfd *); 2221 2222 extern bfd_boolean bfd_elf64_swap_symbol_in 2223 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2224 extern void bfd_elf64_swap_symbol_out 2225 (bfd *, const Elf_Internal_Sym *, void *, void *); 2226 extern void bfd_elf64_swap_reloc_in 2227 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2228 extern void bfd_elf64_swap_reloc_out 2229 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2230 extern void bfd_elf64_swap_reloca_in 2231 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2232 extern void bfd_elf64_swap_reloca_out 2233 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2234 extern void bfd_elf64_swap_phdr_in 2235 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *); 2236 extern void bfd_elf64_swap_phdr_out 2237 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *); 2238 extern void bfd_elf64_swap_dyn_in 2239 (bfd *, const void *, Elf_Internal_Dyn *); 2240 extern void bfd_elf64_swap_dyn_out 2241 (bfd *, const Elf_Internal_Dyn *, void *); 2242 extern long bfd_elf64_slurp_symbol_table 2243 (bfd *, asymbol **, bfd_boolean); 2244 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr 2245 (bfd *); 2246 extern int bfd_elf64_write_out_phdrs 2247 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2248 extern bfd_boolean bfd_elf64_checksum_contents 2249 (bfd * , void (*) (const void *, size_t, void *), void *); 2250 extern void bfd_elf64_write_relocs 2251 (bfd *, asection *, void *); 2252 extern bfd_boolean bfd_elf64_slurp_reloc_table 2253 (bfd *, asection *, asymbol **, bfd_boolean); 2254 2255 extern bfd_boolean _bfd_elf_default_relocs_compatible 2256 (const bfd_target *, const bfd_target *); 2257 2258 extern bfd_boolean _bfd_elf_relocs_compatible 2259 (const bfd_target *, const bfd_target *); 2260 extern bfd_boolean _bfd_elf_notice_as_needed 2261 (bfd *, struct bfd_link_info *, enum notice_asneeded_action); 2262 2263 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup 2264 (bfd *, struct bfd_link_info *, const char *); 2265 extern bfd_boolean bfd_elf_link_add_symbols 2266 (bfd *, struct bfd_link_info *); 2267 extern bfd_boolean _bfd_elf_add_dynamic_entry 2268 (struct bfd_link_info *, bfd_vma, bfd_vma); 2269 extern bfd_boolean _bfd_elf_link_check_relocs 2270 (bfd *, struct bfd_link_info *); 2271 2272 extern bfd_boolean bfd_elf_link_record_dynamic_symbol 2273 (struct bfd_link_info *, struct elf_link_hash_entry *); 2274 2275 extern int bfd_elf_link_record_local_dynamic_symbol 2276 (struct bfd_link_info *, bfd *, long); 2277 2278 extern bfd_boolean _bfd_elf_close_and_cleanup 2279 (bfd *); 2280 2281 extern bfd_boolean _bfd_elf_common_definition 2282 (Elf_Internal_Sym *); 2283 2284 extern unsigned int _bfd_elf_common_section_index 2285 (asection *); 2286 2287 extern asection *_bfd_elf_common_section 2288 (asection *); 2289 2290 extern bfd_vma _bfd_elf_default_got_elt_size 2291 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *, 2292 unsigned long); 2293 2294 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn 2295 (bfd *, arelent *, struct bfd_symbol *, void *, 2296 asection *, bfd *, char **); 2297 2298 extern bfd_boolean bfd_elf_final_link 2299 (bfd *, struct bfd_link_info *); 2300 2301 extern void _bfd_elf_gc_keep 2302 (struct bfd_link_info *info); 2303 2304 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol 2305 (struct elf_link_hash_entry *h, void *inf); 2306 2307 extern bfd_boolean bfd_elf_gc_sections 2308 (bfd *, struct bfd_link_info *); 2309 2310 extern bfd_boolean bfd_elf_gc_record_vtinherit 2311 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2312 2313 extern bfd_boolean bfd_elf_gc_record_vtentry 2314 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2315 2316 extern asection *_bfd_elf_gc_mark_hook 2317 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 2318 struct elf_link_hash_entry *, Elf_Internal_Sym *); 2319 2320 extern asection *_bfd_elf_gc_mark_rsec 2321 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2322 struct elf_reloc_cookie *, bfd_boolean *); 2323 2324 extern bfd_boolean _bfd_elf_gc_mark_reloc 2325 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2326 struct elf_reloc_cookie *); 2327 2328 extern bfd_boolean _bfd_elf_gc_mark_fdes 2329 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn, 2330 struct elf_reloc_cookie *); 2331 2332 extern bfd_boolean _bfd_elf_gc_mark 2333 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn); 2334 2335 extern bfd_boolean _bfd_elf_gc_mark_extra_sections 2336 (struct bfd_link_info *, elf_gc_mark_hook_fn); 2337 2338 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets 2339 (bfd *, struct bfd_link_info *); 2340 2341 extern bfd_boolean bfd_elf_gc_common_final_link 2342 (bfd *, struct bfd_link_info *); 2343 2344 extern asection *_bfd_elf_is_start_stop 2345 (const struct bfd_link_info *, struct elf_link_hash_entry *); 2346 2347 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p 2348 (bfd_vma, void *); 2349 2350 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment 2351 (bfd *, asection *); 2352 2353 extern bfd_boolean _bfd_elf_map_sections_to_segments 2354 (bfd *, struct bfd_link_info *); 2355 2356 extern bfd_boolean _bfd_elf_is_function_type (unsigned int); 2357 2358 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *, 2359 bfd_vma *); 2360 2361 extern asection *_bfd_elf_get_reloc_section (asection *); 2362 2363 extern int bfd_elf_get_default_section_type (flagword); 2364 2365 extern bfd_boolean bfd_elf_lookup_section_flags 2366 (struct bfd_link_info *, struct flag_info *, asection *); 2367 2368 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section 2369 (bfd * abfd, asection * section); 2370 2371 /* PowerPC @tls opcode transform/validate. */ 2372 extern unsigned int _bfd_elf_ppc_at_tls_transform 2373 (unsigned int, unsigned int); 2374 /* PowerPC @tprel opcode transform/validate. */ 2375 extern unsigned int _bfd_elf_ppc_at_tprel_transform 2376 (unsigned int, unsigned int); 2377 /* PowerPC elf_object_p tweak. */ 2378 extern bfd_boolean _bfd_elf_ppc_set_arch (bfd *); 2379 2380 /* Exported interface for writing elf corefile notes. */ 2381 extern char *elfcore_write_note 2382 (bfd *, char *, int *, const char *, int, const void *, int); 2383 extern char *elfcore_write_prpsinfo 2384 (bfd *, char *, int *, const char *, const char *); 2385 extern char *elfcore_write_prstatus 2386 (bfd *, char *, int *, long, int, const void *); 2387 extern char * elfcore_write_pstatus 2388 (bfd *, char *, int *, long, int, const void *); 2389 extern char *elfcore_write_prfpreg 2390 (bfd *, char *, int *, const void *, int); 2391 extern char *elfcore_write_prxfpreg 2392 (bfd *, char *, int *, const void *, int); 2393 extern char *elfcore_write_xstatereg 2394 (bfd *, char *, int *, const void *, int); 2395 extern char *elfcore_write_ppc_vmx 2396 (bfd *, char *, int *, const void *, int); 2397 extern char *elfcore_write_ppc_vsx 2398 (bfd *, char *, int *, const void *, int); 2399 extern char *elfcore_write_s390_timer 2400 (bfd *, char *, int *, const void *, int); 2401 extern char *elfcore_write_s390_todcmp 2402 (bfd *, char *, int *, const void *, int); 2403 extern char *elfcore_write_s390_todpreg 2404 (bfd *, char *, int *, const void *, int); 2405 extern char *elfcore_write_s390_ctrs 2406 (bfd *, char *, int *, const void *, int); 2407 extern char *elfcore_write_s390_prefix 2408 (bfd *, char *, int *, const void *, int); 2409 extern char *elfcore_write_s390_last_break 2410 (bfd *, char *, int *, const void *, int); 2411 extern char *elfcore_write_s390_system_call 2412 (bfd *, char *, int *, const void *, int); 2413 extern char *elfcore_write_s390_tdb 2414 (bfd *, char *, int *, const void *, int); 2415 extern char *elfcore_write_s390_vxrs_low 2416 (bfd *, char *, int *, const void *, int); 2417 extern char *elfcore_write_s390_vxrs_high 2418 (bfd *, char *, int *, const void *, int); 2419 extern char *elfcore_write_arm_vfp 2420 (bfd *, char *, int *, const void *, int); 2421 extern char *elfcore_write_aarch_tls 2422 (bfd *, char *, int *, const void *, int); 2423 extern char *elfcore_write_aarch_hw_break 2424 (bfd *, char *, int *, const void *, int); 2425 extern char *elfcore_write_aarch_hw_watch 2426 (bfd *, char *, int *, const void *, int); 2427 extern char *elfcore_write_lwpstatus 2428 (bfd *, char *, int *, long, int, const void *); 2429 extern char *elfcore_write_register_note 2430 (bfd *, char *, int *, const char *, const void *, int); 2431 2432 /* Internal structure which holds information to be included in the 2433 PRPSINFO section of Linux core files. 2434 2435 This is an "internal" structure in the sense that it should be used 2436 to pass information to BFD (via the `elfcore_write_linux_prpsinfo' 2437 function), so things like endianess shouldn't be an issue. This 2438 structure will eventually be converted in one of the 2439 `elf_external_linux_*' structures and written out to an output bfd 2440 by one of the functions declared below. */ 2441 2442 struct elf_internal_linux_prpsinfo 2443 { 2444 char pr_state; /* Numeric process state. */ 2445 char pr_sname; /* Char for pr_state. */ 2446 char pr_zomb; /* Zombie. */ 2447 char pr_nice; /* Nice val. */ 2448 unsigned long pr_flag; /* Flags. */ 2449 unsigned int pr_uid; 2450 unsigned int pr_gid; 2451 int pr_pid, pr_ppid, pr_pgrp, pr_sid; 2452 char pr_fname[16 + 1]; /* Filename of executable. */ 2453 char pr_psargs[80 + 1]; /* Initial part of arg list. */ 2454 }; 2455 2456 /* Linux/most 32-bit archs. */ 2457 extern char *elfcore_write_linux_prpsinfo32 2458 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2459 2460 /* Linux/most 64-bit archs. */ 2461 extern char *elfcore_write_linux_prpsinfo64 2462 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2463 2464 /* Linux/PPC32 uses different layout compared to most archs. */ 2465 extern char *elfcore_write_ppc_linux_prpsinfo32 2466 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2467 2468 extern bfd *_bfd_elf32_bfd_from_remote_memory 2469 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 2470 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2471 extern bfd *_bfd_elf64_bfd_from_remote_memory 2472 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 2473 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2474 2475 extern bfd_vma bfd_elf_obj_attr_size (bfd *); 2476 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma); 2477 extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int); 2478 extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int); 2479 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \ 2480 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2481 extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *); 2482 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \ 2483 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2484 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int, 2485 unsigned int, const char *); 2486 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \ 2487 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \ 2488 (INTVAL), (STRVAL)) 2489 2490 extern char *_bfd_elf_attr_strdup (bfd *, const char *); 2491 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *); 2492 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int); 2493 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *); 2494 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *); 2495 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int); 2496 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *); 2497 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec); 2498 2499 /* The linker may need to keep track of the number of relocs that it 2500 decides to copy as dynamic relocs in check_relocs for each symbol. 2501 This is so that it can later discard them if they are found to be 2502 unnecessary. We can store the information in a field extending the 2503 regular ELF linker hash table. */ 2504 2505 struct elf_dyn_relocs 2506 { 2507 struct elf_dyn_relocs *next; 2508 2509 /* The input section of the reloc. */ 2510 asection *sec; 2511 2512 /* Total number of relocs copied for the input section. */ 2513 bfd_size_type count; 2514 2515 /* Number of pc-relative relocs copied for the input section. */ 2516 bfd_size_type pc_count; 2517 }; 2518 2519 extern bfd_boolean _bfd_elf_create_ifunc_sections 2520 (bfd *, struct bfd_link_info *); 2521 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs 2522 (struct bfd_link_info *, struct elf_link_hash_entry *, 2523 struct elf_dyn_relocs **, bfd_boolean *, unsigned int, 2524 unsigned int, unsigned int, bfd_boolean); 2525 extern long _bfd_elf_ifunc_get_synthetic_symtab 2526 (bfd *, long, asymbol **, long, asymbol **, asymbol **, asection *, 2527 bfd_vma *(*) (bfd *, asymbol **, asection *, asection *)); 2528 2529 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *); 2530 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *); 2531 2532 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma); 2533 extern bfd_vma elf64_r_sym (bfd_vma); 2534 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma); 2535 extern bfd_vma elf32_r_sym (bfd_vma); 2536 2537 /* Large common section. */ 2538 extern asection _bfd_elf_large_com_section; 2539 2540 /* Hash for local symbol with the first section id, ID, in the input 2541 file and the local symbol index, SYM. */ 2542 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \ 2543 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \ 2544 ^ (SYM) ^ ((ID) >> 16)) 2545 2546 /* This is the condition under which finish_dynamic_symbol will be called. 2547 If our finish_dynamic_symbol isn't called, we'll need to do something 2548 about initializing any .plt and .got entries in relocate_section. */ 2549 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \ 2550 ((DYN) \ 2551 && ((SHARED) || !(H)->forced_local) \ 2552 && ((H)->dynindx != -1 || (H)->forced_local)) 2553 2554 /* This macro is to avoid lots of duplicated code in the body 2555 of xxx_relocate_section() in the various elfxx-xxxx.c files. */ 2556 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \ 2557 r_symndx, symtab_hdr, sym_hashes, \ 2558 h, sec, relocation, \ 2559 unresolved_reloc, warned, ignored) \ 2560 do \ 2561 { \ 2562 /* It seems this can happen with erroneous or unsupported \ 2563 input (mixing a.out and elf in an archive, for example.) */ \ 2564 if (sym_hashes == NULL) \ 2565 return FALSE; \ 2566 \ 2567 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \ 2568 \ 2569 if (info->wrap_hash != NULL \ 2570 && (input_section->flags & SEC_DEBUGGING) != 0) \ 2571 h = ((struct elf_link_hash_entry *) \ 2572 unwrap_hash_lookup (info, input_bfd, &h->root)); \ 2573 \ 2574 while (h->root.type == bfd_link_hash_indirect \ 2575 || h->root.type == bfd_link_hash_warning) \ 2576 h = (struct elf_link_hash_entry *) h->root.u.i.link; \ 2577 \ 2578 warned = FALSE; \ 2579 ignored = FALSE; \ 2580 unresolved_reloc = FALSE; \ 2581 relocation = 0; \ 2582 if (h->root.type == bfd_link_hash_defined \ 2583 || h->root.type == bfd_link_hash_defweak) \ 2584 { \ 2585 sec = h->root.u.def.section; \ 2586 if (sec == NULL \ 2587 || sec->output_section == NULL) \ 2588 /* Set a flag that will be cleared later if we find a \ 2589 relocation value for this symbol. output_section \ 2590 is typically NULL for symbols satisfied by a shared \ 2591 library. */ \ 2592 unresolved_reloc = TRUE; \ 2593 else \ 2594 relocation = (h->root.u.def.value \ 2595 + sec->output_section->vma \ 2596 + sec->output_offset); \ 2597 } \ 2598 else if (h->root.type == bfd_link_hash_undefweak) \ 2599 ; \ 2600 else if (info->unresolved_syms_in_objects == RM_IGNORE \ 2601 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \ 2602 ignored = TRUE; \ 2603 else if (!bfd_link_relocatable (info)) \ 2604 { \ 2605 bfd_boolean err; \ 2606 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \ 2607 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \ 2608 (*info->callbacks->undefined_symbol) (info, \ 2609 h->root.root.string, \ 2610 input_bfd, \ 2611 input_section, \ 2612 rel->r_offset, err); \ 2613 warned = TRUE; \ 2614 } \ 2615 (void) unresolved_reloc; \ 2616 (void) warned; \ 2617 (void) ignored; \ 2618 } \ 2619 while (0) 2620 2621 /* This macro is to avoid lots of duplicated code in the body of the 2622 loop over relocations in xxx_relocate_section() in the various 2623 elfxx-xxxx.c files. 2624 2625 Handle relocations against symbols from removed linkonce sections, 2626 or sections discarded by a linker script. When doing a relocatable 2627 link, we remove such relocations. Otherwise, we just want the 2628 section contents zeroed and avoid any special processing. */ 2629 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \ 2630 rel, count, relend, \ 2631 howto, index, contents) \ 2632 { \ 2633 int i_; \ 2634 _bfd_clear_contents (howto, input_bfd, input_section, \ 2635 contents + rel[index].r_offset); \ 2636 \ 2637 if (bfd_link_relocatable (info) \ 2638 && (input_section->flags & SEC_DEBUGGING)) \ 2639 { \ 2640 /* Only remove relocations in debug sections since other \ 2641 sections may require relocations. */ \ 2642 Elf_Internal_Shdr *rel_hdr; \ 2643 \ 2644 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \ 2645 \ 2646 /* Avoid empty output section. */ \ 2647 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \ 2648 { \ 2649 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 2650 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \ 2651 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 2652 \ 2653 memmove (rel, rel + count, \ 2654 (relend - rel - count) * sizeof (*rel)); \ 2655 \ 2656 input_section->reloc_count--; \ 2657 relend -= count; \ 2658 rel--; \ 2659 continue; \ 2660 } \ 2661 } \ 2662 \ 2663 for (i_ = 0; i_ < count; i_++) \ 2664 { \ 2665 rel[i_].r_info = 0; \ 2666 rel[i_].r_addend = 0; \ 2667 } \ 2668 rel += count - 1; \ 2669 continue; \ 2670 } 2671 2672 /* Will a symbol be bound to the definition within the shared 2673 library, if any. A unique symbol can never be bound locally. */ 2674 #define SYMBOLIC_BIND(INFO, H) \ 2675 (!(H)->unique_global \ 2676 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))) 2677 2678 #ifdef __cplusplus 2679 } 2680 #endif 2681 #endif /* _LIBELF_H_ */ 2682