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