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, 2008, 2009
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
27 #include "elf/common.h"
28 #include "elf/external.h"
29 #include "elf/internal.h"
32 /* The number of entries in a section is its size divided by the size
33 of a single entry. This is normally only applicable to reloc and
34 symbol table sections.
35 PR 9934: It is possible to have relocations that do not refer to
36 symbols, thus it is also possible to have a relocation section in
37 an object file, but no symbol table. */
38 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
40 /* If size isn't specified as 64 or 32, NAME macro should fail. */
43 #define NAME(x, y) x ## 64 ## _ ## y
46 #define NAME(x, y) x ## 32 ## _ ## y
51 #define NAME(x, y) x ## NOSIZE ## _ ## y
54 #define ElfNAME(X) NAME(Elf,X)
55 #define elfNAME(X) NAME(elf,X)
57 /* Information held for an ELF symbol. The first field is the
58 corresponding asymbol. Every symbol is an ELF file is actually a
59 pointer to this structure, although it is often handled as a
60 pointer to an asymbol. */
66 /* ELF symbol information. */
67 Elf_Internal_Sym internal_elf_sym;
68 /* Backend specific information. */
71 unsigned int hppa_arg_reloc;
77 /* Version information. This is from an Elf_Internal_Versym
78 structure in a SHT_GNU_versym section. It is zero if there is no
79 version information. */
80 unsigned short version;
84 struct elf_strtab_hash;
88 /* ELF linker hash table entries. */
90 struct elf_link_hash_entry
92 struct bfd_link_hash_entry root;
94 /* Symbol index in output file. This is initialized to -1. It is
95 set to -2 if the symbol is used by a reloc. */
98 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
99 -1 if this is not a dynamic symbol. */
100 /* ??? Note that this is consistently used as a synonym for tests
101 against whether we can perform various simplifying transformations
102 to the code. (E.g. changing a pc-relative jump to a PLT entry
103 into a pc-relative jump to the target function.) That test, which
104 is often relatively complex, and someplaces wrong or incomplete,
105 should really be replaced by a predicate in elflink.c.
107 End result: this field -1 does not indicate that the symbol is
108 not in the dynamic symbol table, but rather that the symbol is
109 not visible outside this DSO. */
112 /* If this symbol requires an entry in the global offset table, the
113 processor specific backend uses this field to track usage and
114 final offset. Two schemes are supported: The first assumes that
115 a symbol may only have one GOT entry, and uses REFCOUNT until
116 size_dynamic_sections, at which point the contents of the .got is
117 fixed. Afterward, if OFFSET is -1, then the symbol does not
118 require a global offset table entry. The second scheme allows
119 multiple GOT entries per symbol, managed via a linked list
120 pointed to by GLIST. */
123 bfd_signed_vma refcount;
125 struct got_entry *glist;
126 struct plt_entry *plist;
129 /* Same, but tracks a procedure linkage table entry. */
130 union gotplt_union plt;
135 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
136 unsigned int type : 8;
138 /* Symbol st_other value, symbol visibility. */
139 unsigned int other : 8;
141 /* Symbol is referenced by a non-shared object. */
142 unsigned int ref_regular : 1;
143 /* Symbol is defined by a non-shared object. */
144 unsigned int def_regular : 1;
145 /* Symbol is referenced by a shared object. */
146 unsigned int ref_dynamic : 1;
147 /* Symbol is defined by a shared object. */
148 unsigned int def_dynamic : 1;
149 /* Symbol has a non-weak reference from a non-shared object. */
150 unsigned int ref_regular_nonweak : 1;
151 /* Dynamic symbol has been adjustd. */
152 unsigned int dynamic_adjusted : 1;
153 /* Symbol needs a copy reloc. */
154 unsigned int needs_copy : 1;
155 /* Symbol needs a procedure linkage table entry. */
156 unsigned int needs_plt : 1;
157 /* Symbol appears in a non-ELF input file. */
158 unsigned int non_elf : 1;
159 /* Symbol should be marked as hidden in the version information. */
160 unsigned int hidden : 1;
161 /* Symbol was forced to local scope due to a version script file. */
162 unsigned int forced_local : 1;
163 /* Symbol was forced to be dynamic due to a version script file. */
164 unsigned int dynamic : 1;
165 /* Symbol was marked during garbage collection. */
166 unsigned int mark : 1;
167 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
168 not currently set by all the backends. */
169 unsigned int non_got_ref : 1;
170 /* Symbol has a definition in a shared object.
171 FIXME: There is no real need for this field if def_dynamic is never
172 cleared and all places that test def_dynamic also test def_regular. */
173 unsigned int dynamic_def : 1;
174 /* Symbol is weak in all shared objects. */
175 unsigned int dynamic_weak : 1;
176 /* Symbol is referenced with a relocation where C/C++ pointer equality
178 unsigned int pointer_equality_needed : 1;
180 /* String table index in .dynstr if this is a dynamic symbol. */
181 unsigned long dynstr_index;
185 /* If this is a weak defined symbol from a dynamic object, this
186 field points to a defined symbol with the same value, if there is
187 one. Otherwise it is NULL. */
188 struct elf_link_hash_entry *weakdef;
190 /* Hash value of the name computed using the ELF hash function.
191 Used part way through size_dynamic_sections, after we've finished
193 unsigned long elf_hash_value;
196 /* Version information. */
199 /* This field is used for a symbol which is not defined in a
200 regular object. It points to the version information read in
201 from the dynamic object. */
202 Elf_Internal_Verdef *verdef;
203 /* This field is used for a symbol which is defined in a regular
204 object. It is set up in size_dynamic_sections. It points to
205 the version information we should write out for this symbol. */
206 struct bfd_elf_version_tree *vertree;
211 /* Virtual table entry use information. This array is nominally of size
212 size/sizeof(target_void_pointer), though we have to be able to assume
213 and track a size while the symbol is still undefined. It is indexed
214 via offset/sizeof(target_void_pointer). */
218 /* Virtual table derivation info. */
219 struct elf_link_hash_entry *parent;
223 /* Will references to this symbol always reference the symbol
224 in this object? STV_PROTECTED is excluded from the visibility test
225 here so that function pointer comparisons work properly. Since
226 function symbols not defined in an app are set to their .plt entry,
227 it's necessary for shared libs to also reference the .plt even
228 though the symbol is really local to the shared lib. */
229 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
230 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
232 /* Will _calls_ to this symbol always call the version in this object? */
233 #define SYMBOL_CALLS_LOCAL(INFO, H) \
234 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
236 /* Common symbols that are turned into definitions don't have the
237 DEF_REGULAR flag set, so they might appear to be undefined. */
238 #define ELF_COMMON_DEF_P(H) \
240 && !(H)->def_dynamic \
241 && (H)->root.type == bfd_link_hash_defined)
243 /* Records local symbols to be emitted in the dynamic symbol table. */
245 struct elf_link_local_dynamic_entry
247 struct elf_link_local_dynamic_entry *next;
249 /* The input bfd this symbol came from. */
252 /* The index of the local symbol being copied. */
255 /* The index in the outgoing dynamic symbol table. */
258 /* A copy of the input symbol. */
259 Elf_Internal_Sym isym;
262 struct elf_link_loaded_list
264 struct elf_link_loaded_list *next;
268 /* Structures used by the eh_frame optimization code. */
273 /* If REMOVED == 1, this is the CIE that the FDE originally used.
274 The CIE belongs to the same .eh_frame input section as the FDE.
276 If REMOVED == 0, this is the CIE that we have chosen to use for
277 the output FDE. The CIE's REMOVED field is also 0, but the CIE
278 might belong to a different .eh_frame input section from the FDE. */
279 struct eh_cie_fde *cie_inf;
280 struct eh_cie_fde *next_for_section;
283 /* CIEs have three states:
285 - REMOVED && !MERGED: Slated for removal because we haven't yet
286 proven that an FDE needs it. FULL_CIE, if nonnull, points to
287 more detailed information about the CIE.
289 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
290 which may not belong to the same input section.
292 - !REMOVED: We have decided to keep this CIE. SEC is the
293 .eh_frame input section that contains the CIE. */
295 struct cie *full_cie;
296 struct eh_cie_fde *merged_with;
300 /* True if we have marked relocations associated with this CIE. */
301 unsigned int gc_mark : 1;
303 /* True if we have decided to turn an absolute LSDA encoding into
304 a PC-relative one. */
305 unsigned int make_lsda_relative : 1;
307 /* True if the CIE contains personality data and if that data
308 uses a PC-relative encoding. */
309 unsigned int per_encoding_relative : 1;
311 /* True if we need to add an 'R' (FDE encoding) entry to the
312 CIE's augmentation data. */
313 unsigned int add_fde_encoding : 1;
315 /* True if we have merged this CIE with another. */
316 unsigned int merged : 1;
319 unsigned int reloc_index;
322 unsigned int new_offset;
323 unsigned int fde_encoding : 8;
324 unsigned int lsda_encoding : 8;
325 unsigned int lsda_offset : 8;
327 /* True if this entry represents a CIE, false if it represents an FDE. */
328 unsigned int cie : 1;
330 /* True if this entry is currently marked for removal. */
331 unsigned int removed : 1;
333 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
334 augmentation data, and an associated byte to each of the CIE's FDEs. */
335 unsigned int add_augmentation_size : 1;
337 /* True if we have decided to convert absolute FDE relocations into
338 relative ones. This applies to the first relocation in the FDE,
339 which is against the code that the FDE describes. */
340 unsigned int make_relative : 1;
343 unsigned int pad1 : 4;
345 unsigned int *set_loc;
348 struct eh_frame_sec_info
352 struct eh_cie_fde entry[1];
355 struct eh_frame_array_ent
363 struct eh_frame_hdr_info
367 unsigned int fde_count, array_count;
368 struct eh_frame_array_ent *array;
369 /* TRUE if we should try to merge CIEs between input sections. */
370 bfd_boolean merge_cies;
371 /* TRUE if all .eh_frames have been parsd. */
372 bfd_boolean parsed_eh_frames;
373 /* TRUE if .eh_frame_hdr should contain the sorted search table.
374 We build it if we successfully read all .eh_frame input sections
375 and recognize them. */
379 /* ELF linker hash table. */
381 struct elf_link_hash_table
383 struct bfd_link_hash_table root;
385 /* Whether we have created the special dynamic sections required
386 when linking against or generating a shared object. */
387 bfd_boolean dynamic_sections_created;
389 /* True if this target has relocatable executables, so needs dynamic
391 bfd_boolean is_relocatable_executable;
393 /* The BFD used to hold special sections created by the linker.
394 This will be the first BFD found which requires these sections to
398 /* The value to use when initialising got.refcount/offset and
399 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
400 the values are refcounts. Set to init_got_offset/init_plt_offset
401 in size_dynamic_sections when the values may be offsets. */
402 union gotplt_union init_got_refcount;
403 union gotplt_union init_plt_refcount;
405 /* The value to use for got.refcount/offset and plt.refcount/offset
406 when the values may be offsets. Normally (bfd_vma) -1. */
407 union gotplt_union init_got_offset;
408 union gotplt_union init_plt_offset;
410 /* The number of symbols found in the link which must be put into
411 the .dynsym section. */
412 bfd_size_type dynsymcount;
414 /* The string table of dynamic symbols, which becomes the .dynstr
416 struct elf_strtab_hash *dynstr;
418 /* The number of buckets in the hash table in the .hash section.
419 This is based on the number of dynamic symbols. */
420 bfd_size_type bucketcount;
422 /* A linked list of DT_NEEDED names found in dynamic objects
423 included in the link. */
424 struct bfd_link_needed_list *needed;
426 /* Sections in the output bfd that provides a section symbol
427 to be used by relocations emitted against local symbols.
428 Most targets will not use data_index_section. */
429 asection *text_index_section;
430 asection *data_index_section;
432 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
433 struct elf_link_hash_entry *hgot;
435 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
436 struct elf_link_hash_entry *hplt;
438 /* A pointer to information used to merge SEC_MERGE sections. */
441 /* Used to link stabs in sections. */
442 struct stab_info stab_info;
444 /* Used by eh_frame code when editing .eh_frame. */
445 struct eh_frame_hdr_info eh_info;
447 /* A linked list of local symbols to be added to .dynsym. */
448 struct elf_link_local_dynamic_entry *dynlocal;
450 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
451 objects included in the link. */
452 struct bfd_link_needed_list *runpath;
454 /* Cached first output tls section and size of PT_TLS segment. */
456 bfd_size_type tls_size;
458 /* A linked list of BFD's loaded in the link. */
459 struct elf_link_loaded_list *loaded;
462 /* Look up an entry in an ELF linker hash table. */
464 #define elf_link_hash_lookup(table, string, create, copy, follow) \
465 ((struct elf_link_hash_entry *) \
466 bfd_link_hash_lookup (&(table)->root, (string), (create), \
469 /* Traverse an ELF linker hash table. */
471 #define elf_link_hash_traverse(table, func, info) \
472 (bfd_link_hash_traverse \
474 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
477 /* Get the ELF linker hash table from a link_info structure. */
479 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
481 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
482 #define is_elf_hash_table(htab) \
483 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
485 /* Used by bfd_section_from_r_symndx to cache a small number of local
486 symbol to section mappings. */
487 #define LOCAL_SYM_CACHE_SIZE 32
491 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
492 unsigned int shndx[LOCAL_SYM_CACHE_SIZE];
495 /* Constant information held for an ELF backend. */
497 struct elf_size_info {
498 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
499 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
501 /* The size of entries in the .hash section. */
502 unsigned char sizeof_hash_entry;
504 /* The number of internal relocations to allocate per external
506 unsigned char int_rels_per_ext_rel;
507 /* We use some fixed size arrays. This should be large enough to
508 handle all back-ends. */
509 #define MAX_INT_RELS_PER_EXT_REL 3
511 unsigned char arch_size, log_file_align;
512 unsigned char elfclass, ev_current;
513 int (*write_out_phdrs)
514 (bfd *, const Elf_Internal_Phdr *, unsigned int);
516 (*write_shdrs_and_ehdr) (bfd *);
517 bfd_boolean (*checksum_contents)
518 (bfd * , void (*) (const void *, size_t, void *), void *);
520 (bfd *, asection *, void *);
521 bfd_boolean (*swap_symbol_in)
522 (bfd *, const void *, const void *, Elf_Internal_Sym *);
523 void (*swap_symbol_out)
524 (bfd *, const Elf_Internal_Sym *, void *, void *);
525 bfd_boolean (*slurp_reloc_table)
526 (bfd *, asection *, asymbol **, bfd_boolean);
527 long (*slurp_symbol_table)
528 (bfd *, asymbol **, bfd_boolean);
530 (bfd *, const void *, Elf_Internal_Dyn *);
532 (bfd *, const Elf_Internal_Dyn *, void *);
534 /* This function is called to swap in a REL relocation. If an
535 external relocation corresponds to more than one internal
536 relocation, then all relocations are swapped in at once. */
537 void (*swap_reloc_in)
538 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
540 /* This function is called to swap out a REL relocation. */
541 void (*swap_reloc_out)
542 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
544 /* This function is called to swap in a RELA relocation. If an
545 external relocation corresponds to more than one internal
546 relocation, then all relocations are swapped in at once. */
547 void (*swap_reloca_in)
548 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
550 /* This function is called to swap out a RELA relocation. */
551 void (*swap_reloca_out)
552 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
555 #define elf_symbol_from(ABFD,S) \
556 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
557 && (S)->the_bfd->tdata.elf_obj_data != 0) \
558 ? (elf_symbol_type *) (S) \
561 enum elf_reloc_type_class {
563 reloc_class_relative,
568 struct elf_reloc_cookie
570 Elf_Internal_Rela *rels, *rel, *relend;
571 Elf_Internal_Sym *locsyms;
575 struct elf_link_hash_entry **sym_hashes;
577 bfd_boolean bad_symtab;
580 /* The level of IRIX compatibility we're striving for. */
588 /* Mapping of ELF section names and types. */
589 struct bfd_elf_special_section
593 /* 0 means name must match PREFIX exactly.
594 -1 means name must start with PREFIX followed by an arbitrary string.
595 -2 means name must match PREFIX exactly or consist of PREFIX followed
596 by a dot then anything.
597 > 0 means name must start with the first PREFIX_LENGTH chars of
598 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
604 enum action_discarded
610 typedef asection * (*elf_gc_mark_hook_fn)
611 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
612 struct elf_link_hash_entry *, Elf_Internal_Sym *);
614 struct elf_backend_data
616 /* The architecture for this backend. */
617 enum bfd_architecture arch;
619 /* The ELF machine code (EM_xxxx) for this backend. */
620 int elf_machine_code;
625 /* The maximum page size for this backend. */
628 /* The minimum page size for this backend. An input object will not be
629 considered page aligned unless its sections are correctly aligned for
630 pages at least this large. May be smaller than maxpagesize. */
633 /* The common page size for this backend. */
634 bfd_vma commonpagesize;
636 /* The BFD flags applied to sections created for dynamic linking. */
637 flagword dynamic_sec_flags;
639 /* A function to translate an ELF RELA relocation to a BFD arelent
641 void (*elf_info_to_howto)
642 (bfd *, arelent *, Elf_Internal_Rela *);
644 /* A function to translate an ELF REL relocation to a BFD arelent
646 void (*elf_info_to_howto_rel)
647 (bfd *, arelent *, Elf_Internal_Rela *);
649 /* A function to determine whether a symbol is global when
650 partitioning the symbol table into local and global symbols.
651 This should be NULL for most targets, in which case the correct
652 thing will be done. MIPS ELF, at least on the Irix 5, has
653 special requirements. */
654 bfd_boolean (*elf_backend_sym_is_global)
657 /* The remaining functions are hooks which are called only if they
660 /* A function to permit a backend specific check on whether a
661 particular BFD format is relevant for an object file, and to
662 permit the backend to set any global information it wishes. When
663 this is called elf_elfheader is set, but anything else should be
664 used with caution. If this returns FALSE, the check_format
665 routine will return a bfd_error_wrong_format error. */
666 bfd_boolean (*elf_backend_object_p)
669 /* A function to do additional symbol processing when reading the
670 ELF symbol table. This is where any processor-specific special
671 section indices are handled. */
672 void (*elf_backend_symbol_processing)
675 /* A function to do additional symbol processing after reading the
676 entire ELF symbol table. */
677 bfd_boolean (*elf_backend_symbol_table_processing)
678 (bfd *, elf_symbol_type *, unsigned int);
680 /* A function to set the type of the info field. Processor-specific
681 types should be handled here. */
682 int (*elf_backend_get_symbol_type)
683 (Elf_Internal_Sym *, int);
685 /* A function to return the linker hash table entry of a symbol that
686 might be satisfied by an archive symbol. */
687 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
688 (bfd *, struct bfd_link_info *, const char *);
690 /* Return true if local section symbols should have a non-null st_name.
691 NULL implies false. */
692 bfd_boolean (*elf_backend_name_local_section_symbols)
695 /* A function to do additional processing on the ELF section header
696 just before writing it out. This is used to set the flags and
697 type fields for some sections, or to actually write out data for
699 bfd_boolean (*elf_backend_section_processing)
700 (bfd *, Elf_Internal_Shdr *);
702 /* A function to handle unusual section types when creating BFD
703 sections from ELF sections. */
704 bfd_boolean (*elf_backend_section_from_shdr)
705 (bfd *, Elf_Internal_Shdr *, const char *, int);
707 /* A function to convert machine dependent ELF section header flags to
708 BFD internal section header flags. */
709 bfd_boolean (*elf_backend_section_flags)
710 (flagword *, const Elf_Internal_Shdr *);
712 /* A function that returns a struct containing ELF section flags and
713 type for the given BFD section. */
714 const struct bfd_elf_special_section * (*get_sec_type_attr)
717 /* A function to handle unusual program segment types when creating BFD
718 sections from ELF program segments. */
719 bfd_boolean (*elf_backend_section_from_phdr)
720 (bfd *, Elf_Internal_Phdr *, int, const char *);
722 /* A function to set up the ELF section header for a BFD section in
723 preparation for writing it out. This is where the flags and type
724 fields are set for unusual sections. */
725 bfd_boolean (*elf_backend_fake_sections)
726 (bfd *, Elf_Internal_Shdr *, asection *);
728 /* A function to get the ELF section index for a BFD section. If
729 this returns TRUE, the section was found. If it is a normal ELF
730 section, *RETVAL should be left unchanged. If it is not a normal
731 ELF section *RETVAL should be set to the SHN_xxxx index. */
732 bfd_boolean (*elf_backend_section_from_bfd_section)
733 (bfd *, asection *, int *retval);
735 /* If this field is not NULL, it is called by the add_symbols phase
736 of a link just before adding a symbol to the global linker hash
737 table. It may modify any of the fields as it wishes. If *NAME
738 is set to NULL, the symbol will be skipped rather than being
739 added to the hash table. This function is responsible for
740 handling all processor dependent symbol bindings and section
741 indices, and must set at least *FLAGS and *SEC for each processor
742 dependent case; failure to do so will cause a link error. */
743 bfd_boolean (*elf_add_symbol_hook)
744 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
745 const char **name, flagword *flags, asection **sec, bfd_vma *value);
747 /* If this field is not NULL, it is called by the elf_link_output_sym
748 phase of a link for each symbol which will appear in the object file. */
749 bfd_boolean (*elf_backend_link_output_symbol_hook)
750 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
751 asection *, struct elf_link_hash_entry *);
753 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
754 linker the first time it encounters a dynamic object in the link.
755 This function must create any sections required for dynamic
756 linking. The ABFD argument is a dynamic object. The .interp,
757 .dynamic, .dynsym, .dynstr, and .hash functions have already been
758 created, and this function may modify the section flags if
759 desired. This function will normally create the .got and .plt
760 sections, but different backends have different requirements. */
761 bfd_boolean (*elf_backend_create_dynamic_sections)
762 (bfd *abfd, struct bfd_link_info *info);
764 /* When creating a shared library, determine whether to omit the
765 dynamic symbol for the section. */
766 bfd_boolean (*elf_backend_omit_section_dynsym)
767 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
769 /* Return TRUE if relocations of targets are compatible to the extent
770 that CHECK_RELOCS will properly process them. PR 4424. */
771 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
773 /* The CHECK_RELOCS function is called by the add_symbols phase of
774 the ELF backend linker. It is called once for each section with
775 relocs of an object file, just after the symbols for the object
776 file have been added to the global linker hash table. The
777 function must look through the relocs and do any special handling
778 required. This generally means allocating space in the global
779 offset table, and perhaps allocating space for a reloc. The
780 relocs are always passed as Rela structures; if the section
781 actually uses Rel structures, the r_addend field will always be
783 bfd_boolean (*check_relocs)
784 (bfd *abfd, struct bfd_link_info *info, asection *o,
785 const Elf_Internal_Rela *relocs);
787 /* The CHECK_DIRECTIVES function is called once per input file by
788 the add_symbols phase of the ELF backend linker. The function
789 must inspect the bfd and create any additional symbols according
790 to any custom directives in the bfd. */
791 bfd_boolean (*check_directives)
792 (bfd *abfd, struct bfd_link_info *info);
794 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
795 input file that was not needed by the add_symbols phase of the
796 ELF backend linker. The function must undo any target specific
797 changes in the symbol hash table. */
798 bfd_boolean (*as_needed_cleanup)
799 (bfd *abfd, struct bfd_link_info *info);
801 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
802 linker for every symbol which is defined by a dynamic object and
803 referenced by a regular object. This is called after all the
804 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
805 function has been called. The hash table entry should be
806 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
807 defined in a section from a dynamic object. Dynamic object
808 sections are not included in the final link, and this function is
809 responsible for changing the value to something which the rest of
810 the link can deal with. This will normally involve adding an
811 entry to the .plt or .got or some such section, and setting the
812 symbol to point to that. */
813 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
814 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
816 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
817 after all the linker input files have been seen but before the
818 section sizes have been set. This is called after
819 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
820 bfd_boolean (*elf_backend_always_size_sections)
821 (bfd *output_bfd, struct bfd_link_info *info);
823 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
824 linker after all the linker input files have been seen but before
825 the sections sizes have been set. This is called after
826 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
827 It is only called when linking against a dynamic object. It must
828 set the sizes of the dynamic sections, and may fill in their
829 contents as well. The generic ELF linker can handle the .dynsym,
830 .dynstr and .hash sections. This function must handle the
831 .interp section and any sections created by the
832 CREATE_DYNAMIC_SECTIONS entry point. */
833 bfd_boolean (*elf_backend_size_dynamic_sections)
834 (bfd *output_bfd, struct bfd_link_info *info);
836 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
837 we keep to use as a base for relocs and symbols. */
838 void (*elf_backend_init_index_section)
839 (bfd *output_bfd, struct bfd_link_info *info);
841 /* The RELOCATE_SECTION function is called by the ELF backend linker
842 to handle the relocations for a section.
844 The relocs are always passed as Rela structures; if the section
845 actually uses Rel structures, the r_addend field will always be
848 This function is responsible for adjust the section contents as
849 necessary, and (if using Rela relocs and generating a
850 relocatable output file) adjusting the reloc addend as
853 This function does not have to worry about setting the reloc
854 address or the reloc symbol index.
856 LOCAL_SYMS is a pointer to the swapped in local symbols.
858 LOCAL_SECTIONS is an array giving the section in the input file
859 corresponding to the st_shndx field of each local symbol.
861 The global hash table entry for the global symbols can be found
862 via elf_sym_hashes (input_bfd).
864 When generating relocatable output, this function must handle
865 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
866 going to be the section symbol corresponding to the output
867 section, which means that the addend must be adjusted
870 Returns FALSE on error, TRUE on success, 2 if successful and
871 relocations should be written for this section. */
872 int (*elf_backend_relocate_section)
873 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
874 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
875 Elf_Internal_Sym *local_syms, asection **local_sections);
877 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
878 linker just before it writes a symbol out to the .dynsym section.
879 The processor backend may make any required adjustment to the
880 symbol. It may also take the opportunity to set contents of the
881 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
882 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
883 on those symbols which are defined by a dynamic object. */
884 bfd_boolean (*elf_backend_finish_dynamic_symbol)
885 (bfd *output_bfd, struct bfd_link_info *info,
886 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
888 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
889 linker just before it writes all the dynamic sections out to the
890 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
891 all dynamic symbols. */
892 bfd_boolean (*elf_backend_finish_dynamic_sections)
893 (bfd *output_bfd, struct bfd_link_info *info);
895 /* A function to do any beginning processing needed for the ELF file
896 before building the ELF headers and computing file positions. */
897 void (*elf_backend_begin_write_processing)
898 (bfd *, struct bfd_link_info *);
900 /* A function to do any final processing needed for the ELF file
901 before writing it out. The LINKER argument is TRUE if this BFD
902 was created by the ELF backend linker. */
903 void (*elf_backend_final_write_processing)
904 (bfd *, bfd_boolean linker);
906 /* This function is called by get_program_header_size. It should
907 return the number of additional program segments which this BFD
908 will need. It should return -1 on error. */
909 int (*elf_backend_additional_program_headers)
910 (bfd *, struct bfd_link_info *);
912 /* This function is called to modify an existing segment map in a
913 backend specific fashion. */
914 bfd_boolean (*elf_backend_modify_segment_map)
915 (bfd *, struct bfd_link_info *);
917 /* This function is called to modify program headers just before
919 bfd_boolean (*elf_backend_modify_program_headers)
920 (bfd *, struct bfd_link_info *);
922 /* This function is called before section garbage collection to
923 mark entry symbol sections. */
925 (struct bfd_link_info *);
927 /* This function is called during section garbage collection to
928 mark sections that define global symbols. */
929 bfd_boolean (*gc_mark_dynamic_ref)
930 (struct elf_link_hash_entry *, void *);
932 /* This function is called during section gc to discover the section a
933 particular relocation refers to. */
934 elf_gc_mark_hook_fn gc_mark_hook;
936 /* This function, if defined, is called after the first gc marking pass
937 to allow the backend to mark additional sections. */
938 bfd_boolean (*gc_mark_extra_sections)
939 (struct bfd_link_info *, elf_gc_mark_hook_fn);
941 /* This function, if defined, is called during the sweep phase of gc
942 in order that a backend might update any data structures it might
944 bfd_boolean (*gc_sweep_hook)
945 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
947 /* This function, if defined, is called after the ELF headers have
948 been created. This allows for things like the OS and ABI versions
950 void (*elf_backend_post_process_headers)
951 (bfd *, struct bfd_link_info *);
953 /* This function, if defined, prints a symbol to file and returns the
954 name of the symbol to be printed. It should return NULL to fall
955 back to default symbol printing. */
956 const char *(*elf_backend_print_symbol_all)
957 (bfd *, void *, asymbol *);
959 /* This function, if defined, is called after all local symbols and
960 global symbols converted to locals are emitted into the symtab
961 section. It allows the backend to emit special local symbols
962 not handled in the hash table. */
963 bfd_boolean (*elf_backend_output_arch_local_syms)
964 (bfd *, struct bfd_link_info *, void *,
965 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
966 struct elf_link_hash_entry *));
968 /* This function, if defined, is called after all symbols are emitted
969 into the symtab section. It allows the backend to emit special
970 global symbols not handled in the hash table. */
971 bfd_boolean (*elf_backend_output_arch_syms)
972 (bfd *, struct bfd_link_info *, void *,
973 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
974 struct elf_link_hash_entry *));
976 /* Copy any information related to dynamic linking from a pre-existing
977 symbol to a newly created symbol. Also called to copy flags and
978 other back-end info to a weakdef, in which case the symbol is not
979 newly created and plt/got refcounts and dynamic indices should not
981 void (*elf_backend_copy_indirect_symbol)
982 (struct bfd_link_info *, struct elf_link_hash_entry *,
983 struct elf_link_hash_entry *);
985 /* Modify any information related to dynamic linking such that the
986 symbol is not exported. */
987 void (*elf_backend_hide_symbol)
988 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
990 /* A function to do additional symbol fixup, called by
991 _bfd_elf_fix_symbol_flags. */
992 bfd_boolean (*elf_backend_fixup_symbol)
993 (struct bfd_link_info *, struct elf_link_hash_entry *);
995 /* Merge the backend specific symbol attribute. */
996 void (*elf_backend_merge_symbol_attribute)
997 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1000 /* This function, if defined, will return a string containing the
1001 name of a target-specific dynamic tag. */
1002 char *(*elf_backend_get_target_dtag)
1005 /* Decide whether an undefined symbol is special and can be ignored.
1006 This is the case for OPTIONAL symbols on IRIX. */
1007 bfd_boolean (*elf_backend_ignore_undef_symbol)
1008 (struct elf_link_hash_entry *);
1010 /* Emit relocations. Overrides default routine for emitting relocs,
1011 except during a relocatable link, or if all relocs are being emitted. */
1012 bfd_boolean (*elf_backend_emit_relocs)
1013 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1014 struct elf_link_hash_entry **);
1016 /* Count relocations. Not called for relocatable links
1017 or if all relocs are being preserved in the output. */
1018 unsigned int (*elf_backend_count_relocs)
1019 (struct bfd_link_info *, asection *);
1021 /* This function, if defined, is called when an NT_PRSTATUS note is found
1023 bfd_boolean (*elf_backend_grok_prstatus)
1024 (bfd *, Elf_Internal_Note *);
1026 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1027 note is found in a core file. */
1028 bfd_boolean (*elf_backend_grok_psinfo)
1029 (bfd *, Elf_Internal_Note *);
1031 /* This function, if defined, is called to write a note to a corefile. */
1032 char *(*elf_backend_write_core_note)
1033 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1035 /* This function returns class of a reloc type. */
1036 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1037 (const Elf_Internal_Rela *);
1039 /* This function, if defined, removes information about discarded functions
1040 from other sections which mention them. */
1041 bfd_boolean (*elf_backend_discard_info)
1042 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1044 /* This function, if defined, signals that the function above has removed
1045 the discarded relocations for this section. */
1046 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1049 /* What to do when ld finds relocations against symbols defined in
1050 discarded sections. */
1051 unsigned int (*action_discarded)
1054 /* This function returns the width of FDE pointers in bytes, or 0 if
1055 that can't be determined for some reason. The default definition
1056 goes by the bfd's EI_CLASS. */
1057 unsigned int (*elf_backend_eh_frame_address_size)
1058 (bfd *, asection *);
1060 /* These functions tell elf-eh-frame whether to attempt to turn
1061 absolute or lsda encodings into pc-relative ones. The default
1062 definition enables these transformations. */
1063 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1064 (bfd *, struct bfd_link_info *, asection *);
1065 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1066 (bfd *, struct bfd_link_info *, asection *);
1068 /* This function returns an encoding after computing the encoded
1069 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1070 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1071 The default definition chooses a 32-bit PC-relative encoding. */
1072 bfd_byte (*elf_backend_encode_eh_address)
1073 (bfd *abfd, struct bfd_link_info *info,
1074 asection *osec, bfd_vma offset,
1075 asection *loc_sec, bfd_vma loc_offset,
1078 /* This function, if defined, may write out the given section.
1079 Returns TRUE if it did so and FALSE if the caller should. */
1080 bfd_boolean (*elf_backend_write_section)
1081 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1083 /* The level of IRIX compatibility we're striving for.
1084 MIPS ELF specific function. */
1085 irix_compat_t (*elf_backend_mips_irix_compat)
1088 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1089 (unsigned int, bfd_boolean);
1091 /* The swapping table to use when dealing with ECOFF information.
1092 Used for the MIPS ELF .mdebug section. */
1093 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1095 /* This function implements `bfd_elf_bfd_from_remote_memory';
1096 see elf.c, elfcode.h. */
1097 bfd *(*elf_backend_bfd_from_remote_memory)
1098 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1099 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
1101 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1103 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1105 /* Is symbol defined in common section? */
1106 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1108 /* Return a common section index for section. */
1109 unsigned int (*common_section_index) (asection *);
1111 /* Return a common section for section. */
1112 asection *(*common_section) (asection *);
1114 /* Return TRUE if we can merge 2 definitions. */
1115 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1116 struct elf_link_hash_entry **,
1117 struct elf_link_hash_entry *,
1118 Elf_Internal_Sym *, asection **,
1119 bfd_vma *, unsigned int *,
1120 bfd_boolean *, bfd_boolean *,
1121 bfd_boolean *, bfd_boolean *,
1122 bfd_boolean *, bfd_boolean *,
1123 bfd_boolean *, bfd_boolean *,
1125 bfd_boolean *, bfd_boolean *,
1126 bfd_boolean *, bfd_boolean *,
1127 bfd *, asection **);
1129 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1130 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1132 /* Return TRUE if type is a function symbol type. */
1133 bfd_boolean (*is_function_type) (unsigned int type);
1135 /* Used to handle bad SHF_LINK_ORDER input. */
1136 bfd_error_handler_type link_order_error_handler;
1138 /* Name of the PLT relocation section. */
1139 const char *relplt_name;
1141 /* Alternate EM_xxxx machine codes for this backend. */
1142 int elf_machine_alt1;
1143 int elf_machine_alt2;
1145 const struct elf_size_info *s;
1147 /* An array of target specific special sections. */
1148 const struct bfd_elf_special_section *special_sections;
1150 /* The size in bytes of the header for the GOT. This includes the
1151 so-called reserved entries on some systems. */
1152 bfd_vma got_header_size;
1154 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1155 otherwise by the local symbol with index SYMNDX in IBFD. */
1156 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1157 struct elf_link_hash_entry *h,
1158 bfd *ibfd, unsigned long symndx);
1160 /* The vendor name to use for a processor-standard attributes section. */
1161 const char *obj_attrs_vendor;
1163 /* The section name to use for a processor-standard attributes section. */
1164 const char *obj_attrs_section;
1166 /* Return 1, 2 or 3 to indicate what type of arguments a
1167 processor-specific tag takes. */
1168 int (*obj_attrs_arg_type) (int);
1170 /* The section type to use for an attributes section. */
1171 unsigned int obj_attrs_section_type;
1173 /* This function determines the order in which any attributes are written.
1174 It must be defined for input in the range 4..NUM_KNOWN_OBJ_ATTRIBUTES-1
1175 (this range is used in order to make unity easy). The returned value is
1176 the actual tag number to place in the input position. */
1177 int (*obj_attrs_order) (int);
1179 /* This is TRUE if the linker should act like collect and gather
1180 global constructors and destructors by name. This is TRUE for
1181 MIPS ELF because the Irix 5 tools can not handle the .init
1183 unsigned collect : 1;
1185 /* This is TRUE if the linker should ignore changes to the type of a
1186 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1187 record undefined functions as STT_OBJECT although the definitions
1189 unsigned type_change_ok : 1;
1191 /* Whether the backend may use REL relocations. (Some backends use
1192 both REL and RELA relocations, and this flag is set for those
1194 unsigned may_use_rel_p : 1;
1196 /* Whether the backend may use RELA relocations. (Some backends use
1197 both REL and RELA relocations, and this flag is set for those
1199 unsigned may_use_rela_p : 1;
1201 /* Whether the default relocation type is RELA. If a backend with
1202 this flag set wants REL relocations for a particular section,
1203 it must note that explicitly. Similarly, if this flag is clear,
1204 and the backend wants RELA relocations for a particular
1206 unsigned default_use_rela_p : 1;
1208 /* True if PLT and copy relocations should be RELA by default. */
1209 unsigned rela_plts_and_copies_p : 1;
1211 /* Set if RELA relocations for a relocatable link can be handled by
1212 generic code. Backends that set this flag need do nothing in the
1213 backend relocate_section routine for relocatable linking. */
1214 unsigned rela_normal : 1;
1216 /* TRUE if addresses "naturally" sign extend. This is used when
1217 swapping in from Elf32 when BFD64. */
1218 unsigned sign_extend_vma : 1;
1220 unsigned want_got_plt : 1;
1221 unsigned plt_readonly : 1;
1222 unsigned want_plt_sym : 1;
1223 unsigned plt_not_loaded : 1;
1224 unsigned plt_alignment : 4;
1225 unsigned can_gc_sections : 1;
1226 unsigned can_refcount : 1;
1227 unsigned want_got_sym : 1;
1228 unsigned want_dynbss : 1;
1230 /* Targets which do not support physical addressing often require
1231 that the p_paddr field in the section header to be set to zero.
1232 This field indicates whether this behavior is required. */
1233 unsigned want_p_paddr_set_to_zero : 1;
1235 /* True if an object file lacking a .note.GNU-stack section
1236 should be assumed to be requesting exec stack. At least one
1237 other file in the link needs to have a .note.GNU-stack section
1238 for a PT_GNU_STACK segment to be created. */
1239 unsigned default_execstack : 1;
1242 /* Information stored for each BFD section in an ELF file. This
1243 structure is allocated by elf_new_section_hook. */
1245 struct bfd_elf_section_data
1247 /* The ELF header for this section. */
1248 Elf_Internal_Shdr this_hdr;
1250 /* The ELF header for the reloc section associated with this
1252 Elf_Internal_Shdr rel_hdr;
1254 /* If there is a second reloc section associated with this section,
1255 as can happen on Irix 6, this field points to the header. */
1256 Elf_Internal_Shdr *rel_hdr2;
1258 /* The number of relocations currently assigned to REL_HDR. */
1259 unsigned int rel_count;
1261 /* The number of relocations currently assigned to REL_HDR2. */
1262 unsigned int rel_count2;
1264 /* The ELF section number of this section. */
1267 /* The ELF section number of the reloc section indicated by
1268 REL_HDR if any. Only used for an output file. */
1271 /* The ELF section number of the reloc section indicated by
1272 REL_HDR2 if any. Only used for an output file. */
1275 /* Used by the backend linker when generating a shared library to
1276 record the dynamic symbol index for a section symbol
1277 corresponding to this section. A value of 0 means that there is
1278 no dynamic symbol for this section. */
1281 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1282 asection *linked_to;
1284 /* Used by the backend linker to store the symbol hash table entries
1285 associated with relocs against global symbols. */
1286 struct elf_link_hash_entry **rel_hashes;
1288 /* A pointer to the swapped relocs. If the section uses REL relocs,
1289 rather than RELA, all the r_addend fields will be zero. This
1290 pointer may be NULL. It is used by the backend linker. */
1291 Elf_Internal_Rela *relocs;
1293 /* A pointer to a linked list tracking dynamic relocs copied for
1297 /* A pointer to the bfd section used for dynamic relocs. */
1300 /* A pointer to the bfd section used for dynamic relocs against ifunc symbols. */
1301 asection *indirect_relocs;
1304 /* Group name, if this section is a member of a group. */
1307 /* Group signature sym, if this is the SHT_GROUP section. */
1308 struct bfd_symbol *id;
1311 /* For a member of a group, points to the SHT_GROUP section.
1312 NULL for the SHT_GROUP section itself and non-group sections. */
1313 asection *sec_group;
1315 /* A linked list of member sections in the group. Circular when used by
1316 the linker. For the SHT_GROUP section, points at first member. */
1317 asection *next_in_group;
1319 /* The FDEs associated with this section. The u.fde.next_in_section
1320 field acts as a chain pointer. */
1321 struct eh_cie_fde *fde_list;
1323 /* A pointer used for various section optimizations. */
1327 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1328 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1329 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1330 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1331 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1332 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1333 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1334 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1335 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1337 #define xvec_get_elf_backend_data(xvec) \
1338 ((const struct elf_backend_data *) (xvec)->backend_data)
1340 #define get_elf_backend_data(abfd) \
1341 xvec_get_elf_backend_data ((abfd)->xvec)
1343 /* The maximum number of known object attributes for any target. */
1344 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1346 /* The value of an object attribute. The type indicates whether the attribute
1347 holds and integer, a string, or both. It can also indicate that there can
1348 be no default (i.e. all values must be written to file, even zero). */
1350 typedef struct obj_attribute
1352 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1353 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1354 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1356 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1357 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1358 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1365 typedef struct obj_attribute_list
1367 struct obj_attribute_list *next;
1370 } obj_attribute_list;
1372 /* Object attributes may either be defined by the processor ABI, index
1373 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1374 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1375 #define OBJ_ATTR_PROC 0
1376 #define OBJ_ATTR_GNU 1
1377 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1378 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1380 /* The following object attribute tags are taken as generic, for all
1381 targets and for "gnu" where there is no target standard. */
1388 Tag_compatibility = 32
1391 /* Enum used to identify target specific extensions to the elf_obj_tdata
1392 structure. Note the enums deliberately start from 1 so that we can
1393 detect an uninitialized field. The generic value is last so that
1394 additions to this enum do not need to modify more than one line. */
1397 ALPHA_ELF_TDATA = 1,
1412 /* Some private data is stashed away for future use using the tdata pointer
1413 in the bfd structure. */
1415 struct elf_obj_tdata
1417 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1418 Elf_Internal_Shdr **elf_sect_ptr;
1419 Elf_Internal_Phdr *phdr;
1420 struct elf_segment_map *segment_map;
1421 struct elf_strtab_hash *strtab_ptr;
1424 unsigned int num_elf_sections; /* elf_sect_ptr size */
1425 int num_section_syms;
1426 asymbol **section_syms; /* STT_SECTION symbols for each section */
1427 Elf_Internal_Shdr symtab_hdr;
1428 Elf_Internal_Shdr shstrtab_hdr;
1429 Elf_Internal_Shdr strtab_hdr;
1430 Elf_Internal_Shdr dynsymtab_hdr;
1431 Elf_Internal_Shdr dynstrtab_hdr;
1432 Elf_Internal_Shdr dynversym_hdr;
1433 Elf_Internal_Shdr dynverref_hdr;
1434 Elf_Internal_Shdr dynverdef_hdr;
1435 Elf_Internal_Shdr symtab_shndx_hdr;
1436 unsigned int symtab_section, shstrtab_section;
1437 unsigned int strtab_section, dynsymtab_section;
1438 unsigned int symtab_shndx_section;
1439 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1440 file_ptr next_file_pos;
1441 bfd_vma gp; /* The gp value */
1442 unsigned int gp_size; /* The gp size */
1444 /* Information grabbed from an elf core file. */
1451 /* A mapping from external symbols to entries in the linker hash
1452 table, used when linking. This is indexed by the symbol index
1453 minus the sh_info field of the symbol table header. */
1454 struct elf_link_hash_entry **sym_hashes;
1456 /* Track usage and final offsets of GOT entries for local symbols.
1457 This array is indexed by symbol index. Elements are used
1458 identically to "got" in struct elf_link_hash_entry. */
1461 bfd_signed_vma *refcounts;
1463 struct got_entry **ents;
1466 /* The linker ELF emulation code needs to let the backend ELF linker
1467 know what filename should be used for a dynamic object if the
1468 dynamic object is found using a search. The emulation code then
1469 sometimes needs to know what name was actually used. Until the
1470 file has been added to the linker symbol table, this field holds
1471 the name the linker wants. After it has been added, it holds the
1472 name actually used, which will be the DT_SONAME entry if there is
1474 const char *dt_name;
1476 /* Records the result of `get_program_header_size'. */
1477 bfd_size_type program_header_size;
1479 /* Used by find_nearest_line entry point. */
1482 /* Used by MIPS ELF find_nearest_line entry point. The structure
1483 could be included directly in this one, but there's no point to
1484 wasting the memory just for the infrequently called
1485 find_nearest_line. */
1486 struct mips_elf_find_line *find_line_info;
1488 /* A place to stash dwarf1 info for this bfd. */
1489 struct dwarf1_debug *dwarf1_find_line_info;
1491 /* A place to stash dwarf2 info for this bfd. */
1492 void *dwarf2_find_line_info;
1494 /* An array of stub sections indexed by symbol number, used by the
1495 MIPS ELF linker. FIXME: We should figure out some way to only
1496 include this field for a MIPS ELF target. */
1497 asection **local_stubs;
1498 asection **local_call_stubs;
1500 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1502 asection *eh_frame_hdr;
1504 Elf_Internal_Shdr **group_sect_ptr;
1507 /* Number of symbol version definitions we are about to emit. */
1508 unsigned int cverdefs;
1510 /* Number of symbol version references we are about to emit. */
1511 unsigned int cverrefs;
1513 /* Segment flags for the PT_GNU_STACK segment. */
1514 unsigned int stack_flags;
1516 /* Symbol version definitions in external objects. */
1517 Elf_Internal_Verdef *verdef;
1519 /* Symbol version references to external objects. */
1520 Elf_Internal_Verneed *verref;
1522 /* The Irix 5 support uses two virtual sections, which represent
1523 text/data symbols defined in dynamic objects. */
1524 asymbol *elf_data_symbol;
1525 asymbol *elf_text_symbol;
1526 asection *elf_data_section;
1527 asection *elf_text_section;
1529 /* A pointer to the .eh_frame section. */
1530 asection *eh_frame_section;
1532 /* Whether a dyanmic object was specified normally on the linker
1533 command line, or was specified when --as-needed was in effect,
1534 or was found via a DT_NEEDED entry. */
1535 enum dynamic_lib_link_class dyn_lib_class;
1537 /* This is set to TRUE if the object was created by the backend
1541 /* Irix 5 often screws up the symbol table, sorting local symbols
1542 after global symbols. This flag is set if the symbol table in
1543 this BFD appears to be screwed up. If it is, we ignore the
1544 sh_info field in the symbol table header, and always read all the
1546 bfd_boolean bad_symtab;
1548 /* Used to determine if the e_flags field has been initialized */
1549 bfd_boolean flags_init;
1551 /* Symbol buffer. */
1554 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1555 obj_attribute_list *other_obj_attributes[2];
1557 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1558 bfd_boolean (*after_write_object_contents) (bfd *);
1559 void *after_write_object_contents_info;
1561 /* NT_GNU_BUILD_ID note type. */
1562 bfd_size_type build_id_size;
1565 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1566 symbol type. Used to set the osabi field in the ELF header
1568 bfd_boolean has_ifunc_symbols;
1570 /* An identifier used to distinguish different target
1571 specific extensions to this structure. */
1572 enum elf_object_id object_id;
1575 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1577 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1578 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> program_header_size)
1579 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1580 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1581 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1582 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1583 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1584 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1585 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1586 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1587 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1588 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1589 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1590 #define elf_eh_frame_section(bfd) \
1591 (elf_tdata(bfd) -> eh_frame_section)
1592 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1593 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1594 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1595 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1596 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1597 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1598 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1599 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1600 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1601 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1602 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1603 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1604 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1605 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1606 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1607 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1608 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1609 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1610 #define elf_known_obj_attributes_proc(bfd) \
1611 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1612 #define elf_other_obj_attributes_proc(bfd) \
1613 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1615 extern void _bfd_elf_swap_verdef_in
1616 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1617 extern void _bfd_elf_swap_verdef_out
1618 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1619 extern void _bfd_elf_swap_verdaux_in
1620 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1621 extern void _bfd_elf_swap_verdaux_out
1622 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1623 extern void _bfd_elf_swap_verneed_in
1624 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1625 extern void _bfd_elf_swap_verneed_out
1626 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1627 extern void _bfd_elf_swap_vernaux_in
1628 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1629 extern void _bfd_elf_swap_vernaux_out
1630 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1631 extern void _bfd_elf_swap_versym_in
1632 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1633 extern void _bfd_elf_swap_versym_out
1634 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1636 extern unsigned int _bfd_elf_section_from_bfd_section
1637 (bfd *, asection *);
1638 extern char *bfd_elf_string_from_elf_section
1639 (bfd *, unsigned, unsigned);
1640 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1641 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1642 Elf_External_Sym_Shndx *);
1643 extern const char *bfd_elf_sym_name
1644 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1646 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1648 extern bfd_boolean _bfd_elf_print_private_bfd_data
1650 extern void bfd_elf_print_symbol
1651 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1653 extern unsigned int _bfd_elf_eh_frame_address_size
1654 (bfd *, asection *);
1655 extern bfd_byte _bfd_elf_encode_eh_address
1656 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1657 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1658 extern bfd_boolean _bfd_elf_can_make_relative
1659 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1661 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1662 (const Elf_Internal_Rela *);
1663 extern bfd_vma _bfd_elf_rela_local_sym
1664 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1665 extern bfd_vma _bfd_elf_rel_local_sym
1666 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1667 extern bfd_vma _bfd_elf_section_offset
1668 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1670 extern unsigned long bfd_elf_hash
1672 extern unsigned long bfd_elf_gnu_hash
1675 extern bfd_reloc_status_type bfd_elf_generic_reloc
1676 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1677 extern bfd_boolean bfd_elf_allocate_object
1678 (bfd *, size_t, enum elf_object_id);
1679 extern bfd_boolean bfd_elf_make_generic_object
1681 extern bfd_boolean bfd_elf_mkcorefile
1683 extern bfd_boolean _bfd_elf_make_section_from_shdr
1684 (bfd *, Elf_Internal_Shdr *, const char *, int);
1685 extern bfd_boolean _bfd_elf_make_section_from_phdr
1686 (bfd *, Elf_Internal_Phdr *, int, const char *);
1687 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1688 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1689 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1691 extern void _bfd_elf_link_hash_copy_indirect
1692 (struct bfd_link_info *, struct elf_link_hash_entry *,
1693 struct elf_link_hash_entry *);
1694 extern void _bfd_elf_link_hash_hide_symbol
1695 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1696 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1697 (struct bfd_link_info *, struct elf_link_hash_entry *);
1698 extern bfd_boolean _bfd_elf_link_hash_table_init
1699 (struct elf_link_hash_table *, bfd *,
1700 struct bfd_hash_entry *(*)
1701 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1703 extern bfd_boolean _bfd_elf_slurp_version_tables
1704 (bfd *, bfd_boolean);
1705 extern bfd_boolean _bfd_elf_merge_sections
1706 (bfd *, struct bfd_link_info *);
1707 extern bfd_boolean _bfd_elf_match_sections_by_type
1708 (bfd *, const asection *, bfd *, const asection *);
1709 extern bfd_boolean bfd_elf_is_group_section
1710 (bfd *, const struct bfd_section *);
1711 extern void _bfd_elf_section_already_linked
1712 (bfd *, struct bfd_section *, struct bfd_link_info *);
1713 extern void bfd_elf_set_group_contents
1714 (bfd *, asection *, void *);
1715 extern asection *_bfd_elf_check_kept_section
1716 (asection *, struct bfd_link_info *);
1717 extern void _bfd_elf_link_just_syms
1718 (asection *, struct bfd_link_info *);
1719 extern bfd_boolean _bfd_elf_copy_private_header_data
1721 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1722 (bfd *, asymbol *, bfd *, asymbol *);
1723 #define _bfd_generic_init_private_section_data \
1724 _bfd_elf_init_private_section_data
1725 extern bfd_boolean _bfd_elf_init_private_section_data
1726 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1727 extern bfd_boolean _bfd_elf_copy_private_section_data
1728 (bfd *, asection *, bfd *, asection *);
1729 extern bfd_boolean _bfd_elf_write_object_contents
1731 extern bfd_boolean _bfd_elf_write_corefile_contents
1733 extern bfd_boolean _bfd_elf_set_section_contents
1734 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1735 extern long _bfd_elf_get_symtab_upper_bound
1737 extern long _bfd_elf_canonicalize_symtab
1738 (bfd *, asymbol **);
1739 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1741 extern long _bfd_elf_canonicalize_dynamic_symtab
1742 (bfd *, asymbol **);
1743 extern long _bfd_elf_get_synthetic_symtab
1744 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1745 extern long _bfd_elf_get_reloc_upper_bound
1747 extern long _bfd_elf_canonicalize_reloc
1748 (bfd *, sec_ptr, arelent **, asymbol **);
1749 extern asection * _bfd_elf_get_dynamic_reloc_section
1750 (bfd *, asection *, bfd_boolean);
1751 extern asection * _bfd_elf_make_dynamic_reloc_section
1752 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1753 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1755 extern long _bfd_elf_canonicalize_dynamic_reloc
1756 (bfd *, arelent **, asymbol **);
1757 extern asymbol *_bfd_elf_make_empty_symbol
1759 extern void _bfd_elf_get_symbol_info
1760 (bfd *, asymbol *, symbol_info *);
1761 extern bfd_boolean _bfd_elf_is_local_label_name
1762 (bfd *, const char *);
1763 extern alent *_bfd_elf_get_lineno
1765 extern bfd_boolean _bfd_elf_set_arch_mach
1766 (bfd *, enum bfd_architecture, unsigned long);
1767 extern bfd_boolean _bfd_elf_find_nearest_line
1768 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1770 extern bfd_boolean _bfd_elf_find_line
1771 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1772 #define _bfd_generic_find_line _bfd_elf_find_line
1773 extern bfd_boolean _bfd_elf_find_inliner_info
1774 (bfd *, const char **, const char **, unsigned int *);
1775 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1776 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1777 extern int _bfd_elf_sizeof_headers
1778 (bfd *, struct bfd_link_info *);
1779 extern bfd_boolean _bfd_elf_new_section_hook
1780 (bfd *, asection *);
1781 extern bfd_boolean _bfd_elf_init_reloc_shdr
1782 (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean);
1783 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1784 (const char *, const struct bfd_elf_special_section *, unsigned int);
1785 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1786 (bfd *, asection *);
1788 /* If the target doesn't have reloc handling written yet: */
1789 extern void _bfd_elf_no_info_to_howto
1790 (bfd *, arelent *, Elf_Internal_Rela *);
1792 extern bfd_boolean bfd_section_from_shdr
1793 (bfd *, unsigned int shindex);
1794 extern bfd_boolean bfd_section_from_phdr
1795 (bfd *, Elf_Internal_Phdr *, int);
1797 extern int _bfd_elf_symbol_from_bfd_symbol
1798 (bfd *, asymbol **);
1800 extern asection *bfd_section_from_r_symndx
1801 (bfd *, struct sym_sec_cache *, asection *, unsigned long);
1802 extern asection *bfd_section_from_elf_index
1803 (bfd *, unsigned int);
1804 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1807 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1809 extern void _bfd_elf_strtab_free
1810 (struct elf_strtab_hash *);
1811 extern bfd_size_type _bfd_elf_strtab_add
1812 (struct elf_strtab_hash *, const char *, bfd_boolean);
1813 extern void _bfd_elf_strtab_addref
1814 (struct elf_strtab_hash *, bfd_size_type);
1815 extern void _bfd_elf_strtab_delref
1816 (struct elf_strtab_hash *, bfd_size_type);
1817 extern void _bfd_elf_strtab_clear_all_refs
1818 (struct elf_strtab_hash *);
1819 extern bfd_size_type _bfd_elf_strtab_size
1820 (struct elf_strtab_hash *);
1821 extern bfd_size_type _bfd_elf_strtab_offset
1822 (struct elf_strtab_hash *, bfd_size_type);
1823 extern bfd_boolean _bfd_elf_strtab_emit
1824 (bfd *, struct elf_strtab_hash *);
1825 extern void _bfd_elf_strtab_finalize
1826 (struct elf_strtab_hash *);
1828 extern void _bfd_elf_begin_eh_frame_parsing
1829 (struct bfd_link_info *info);
1830 extern void _bfd_elf_parse_eh_frame
1831 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1832 extern void _bfd_elf_end_eh_frame_parsing
1833 (struct bfd_link_info *info);
1835 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1836 (bfd *, struct bfd_link_info *, asection *,
1837 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1838 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1839 (bfd *, struct bfd_link_info *);
1840 extern bfd_vma _bfd_elf_eh_frame_section_offset
1841 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1842 extern bfd_boolean _bfd_elf_write_section_eh_frame
1843 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1844 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1845 (bfd *, struct bfd_link_info *);
1846 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1847 (struct bfd_link_info *);
1849 extern bfd_boolean _bfd_elf_merge_symbol
1850 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1851 asection **, bfd_vma *, unsigned int *,
1852 struct elf_link_hash_entry **, bfd_boolean *,
1853 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1855 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1857 extern long _bfd_elf_link_lookup_local_dynindx
1858 (struct bfd_link_info *, bfd *, long);
1859 extern bfd_boolean _bfd_elf_compute_section_file_positions
1860 (bfd *, struct bfd_link_info *);
1861 extern void _bfd_elf_assign_file_positions_for_relocs
1863 extern file_ptr _bfd_elf_assign_file_position_for_section
1864 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1866 extern bfd_boolean _bfd_elf_validate_reloc
1869 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1870 (bfd *, struct bfd_link_info *);
1871 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1872 (bfd *, struct bfd_link_info *, asection *);
1873 extern bfd_boolean _bfd_elf_create_dynamic_sections
1874 (bfd *, struct bfd_link_info *);
1875 extern bfd_boolean _bfd_elf_create_got_section
1876 (bfd *, struct bfd_link_info *);
1877 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1878 (bfd *, struct bfd_link_info *, asection *, const char *);
1879 extern void _bfd_elf_init_1_index_section
1880 (bfd *, struct bfd_link_info *);
1881 extern void _bfd_elf_init_2_index_sections
1882 (bfd *, struct bfd_link_info *);
1884 extern bfd_boolean _bfd_elfcore_make_pseudosection
1885 (bfd *, char *, size_t, ufile_ptr);
1886 extern char *_bfd_elfcore_strndup
1887 (bfd *, char *, size_t);
1889 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1890 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1892 extern bfd_boolean _bfd_elf_link_output_relocs
1893 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1894 struct elf_link_hash_entry **);
1896 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
1897 (struct elf_link_hash_entry *, asection *);
1899 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1900 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1902 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1903 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1905 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
1906 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
1908 extern bfd_boolean _bfd_elf_setup_sections
1911 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
1913 extern const bfd_target *bfd_elf32_object_p
1915 extern const bfd_target *bfd_elf32_core_file_p
1917 extern char *bfd_elf32_core_file_failing_command
1919 extern int bfd_elf32_core_file_failing_signal
1921 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1924 extern bfd_boolean bfd_elf32_swap_symbol_in
1925 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1926 extern void bfd_elf32_swap_symbol_out
1927 (bfd *, const Elf_Internal_Sym *, void *, void *);
1928 extern void bfd_elf32_swap_reloc_in
1929 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1930 extern void bfd_elf32_swap_reloc_out
1931 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1932 extern void bfd_elf32_swap_reloca_in
1933 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1934 extern void bfd_elf32_swap_reloca_out
1935 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1936 extern void bfd_elf32_swap_phdr_in
1937 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
1938 extern void bfd_elf32_swap_phdr_out
1939 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
1940 extern void bfd_elf32_swap_dyn_in
1941 (bfd *, const void *, Elf_Internal_Dyn *);
1942 extern void bfd_elf32_swap_dyn_out
1943 (bfd *, const Elf_Internal_Dyn *, void *);
1944 extern long bfd_elf32_slurp_symbol_table
1945 (bfd *, asymbol **, bfd_boolean);
1946 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
1948 extern int bfd_elf32_write_out_phdrs
1949 (bfd *, const Elf_Internal_Phdr *, unsigned int);
1950 extern bfd_boolean bfd_elf32_checksum_contents
1951 (bfd * , void (*) (const void *, size_t, void *), void *);
1952 extern void bfd_elf32_write_relocs
1953 (bfd *, asection *, void *);
1954 extern bfd_boolean bfd_elf32_slurp_reloc_table
1955 (bfd *, asection *, asymbol **, bfd_boolean);
1957 extern const bfd_target *bfd_elf64_object_p
1959 extern const bfd_target *bfd_elf64_core_file_p
1961 extern char *bfd_elf64_core_file_failing_command
1963 extern int bfd_elf64_core_file_failing_signal
1965 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
1968 extern bfd_boolean bfd_elf64_swap_symbol_in
1969 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1970 extern void bfd_elf64_swap_symbol_out
1971 (bfd *, const Elf_Internal_Sym *, void *, void *);
1972 extern void bfd_elf64_swap_reloc_in
1973 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1974 extern void bfd_elf64_swap_reloc_out
1975 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1976 extern void bfd_elf64_swap_reloca_in
1977 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1978 extern void bfd_elf64_swap_reloca_out
1979 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1980 extern void bfd_elf64_swap_phdr_in
1981 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
1982 extern void bfd_elf64_swap_phdr_out
1983 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
1984 extern void bfd_elf64_swap_dyn_in
1985 (bfd *, const void *, Elf_Internal_Dyn *);
1986 extern void bfd_elf64_swap_dyn_out
1987 (bfd *, const Elf_Internal_Dyn *, void *);
1988 extern long bfd_elf64_slurp_symbol_table
1989 (bfd *, asymbol **, bfd_boolean);
1990 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
1992 extern int bfd_elf64_write_out_phdrs
1993 (bfd *, const Elf_Internal_Phdr *, unsigned int);
1994 extern bfd_boolean bfd_elf64_checksum_contents
1995 (bfd * , void (*) (const void *, size_t, void *), void *);
1996 extern void bfd_elf64_write_relocs
1997 (bfd *, asection *, void *);
1998 extern bfd_boolean bfd_elf64_slurp_reloc_table
1999 (bfd *, asection *, asymbol **, bfd_boolean);
2001 extern bfd_boolean _bfd_elf_default_relocs_compatible
2002 (const bfd_target *, const bfd_target *);
2004 extern bfd_boolean _bfd_elf_relocs_compatible
2005 (const bfd_target *, const bfd_target *);
2007 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2008 (bfd *, struct bfd_link_info *, const char *);
2009 extern bfd_boolean bfd_elf_link_add_symbols
2010 (bfd *, struct bfd_link_info *);
2011 extern bfd_boolean _bfd_elf_add_dynamic_entry
2012 (struct bfd_link_info *, bfd_vma, bfd_vma);
2014 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2015 (struct bfd_link_info *, struct elf_link_hash_entry *);
2017 extern int bfd_elf_link_record_local_dynamic_symbol
2018 (struct bfd_link_info *, bfd *, long);
2020 extern bfd_boolean _bfd_elf_close_and_cleanup
2023 extern bfd_boolean _bfd_elf_common_definition
2024 (Elf_Internal_Sym *);
2026 extern unsigned int _bfd_elf_common_section_index
2029 extern asection *_bfd_elf_common_section
2032 extern void _bfd_dwarf2_cleanup_debug_info
2035 extern bfd_vma _bfd_elf_default_got_elt_size
2036 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2039 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2040 (bfd *, arelent *, struct bfd_symbol *, void *,
2041 asection *, bfd *, char **);
2043 extern bfd_boolean bfd_elf_final_link
2044 (bfd *, struct bfd_link_info *);
2046 extern void _bfd_elf_gc_keep
2047 (struct bfd_link_info *info);
2049 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2050 (struct elf_link_hash_entry *h, void *inf);
2052 extern bfd_boolean bfd_elf_gc_sections
2053 (bfd *, struct bfd_link_info *);
2055 extern bfd_boolean bfd_elf_gc_record_vtinherit
2056 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2058 extern bfd_boolean bfd_elf_gc_record_vtentry
2059 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2061 extern asection *_bfd_elf_gc_mark_hook
2062 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2063 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2065 extern asection *_bfd_elf_gc_mark_rsec
2066 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2067 struct elf_reloc_cookie *);
2069 extern bfd_boolean _bfd_elf_gc_mark_reloc
2070 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2071 struct elf_reloc_cookie *);
2073 extern bfd_boolean _bfd_elf_gc_mark_fdes
2074 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2075 struct elf_reloc_cookie *);
2077 extern bfd_boolean _bfd_elf_gc_mark
2078 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2080 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2081 (bfd *, struct bfd_link_info *);
2083 extern bfd_boolean bfd_elf_gc_common_final_link
2084 (bfd *, struct bfd_link_info *);
2086 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2089 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2090 (bfd *, asection *);
2092 extern bfd_boolean _bfd_elf_map_sections_to_segments
2093 (bfd *, struct bfd_link_info *);
2095 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2097 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2098 (bfd * abfd, asection * section);
2100 /* Exported interface for writing elf corefile notes. */
2101 extern char *elfcore_write_note
2102 (bfd *, char *, int *, const char *, int, const void *, int);
2103 extern char *elfcore_write_prpsinfo
2104 (bfd *, char *, int *, const char *, const char *);
2105 extern char *elfcore_write_prstatus
2106 (bfd *, char *, int *, long, int, const void *);
2107 extern char * elfcore_write_pstatus
2108 (bfd *, char *, int *, long, int, const void *);
2109 extern char *elfcore_write_prfpreg
2110 (bfd *, char *, int *, const void *, int);
2111 extern char *elfcore_write_prxfpreg
2112 (bfd *, char *, int *, const void *, int);
2113 extern char *elfcore_write_ppc_vmx
2114 (bfd *, char *, int *, const void *, int);
2115 extern char *elfcore_write_ppc_vsx
2116 (bfd *, char *, int *, const void *, int);
2117 extern char *elfcore_write_lwpstatus
2118 (bfd *, char *, int *, long, int, const void *);
2119 extern char *elfcore_write_register_note
2120 (bfd *, char *, int *, const char *, const void *, int);
2122 extern bfd *_bfd_elf32_bfd_from_remote_memory
2123 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2124 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2125 extern bfd *_bfd_elf64_bfd_from_remote_memory
2126 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2127 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2129 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2130 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2131 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2132 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2133 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2134 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2135 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2136 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2137 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2138 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2140 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2141 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2144 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2145 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2146 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2147 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2148 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2150 extern asection * _bfd_elf_make_ifunc_reloc_section
2151 (bfd *, asection *, bfd *, unsigned int);
2153 /* Large common section. */
2154 extern asection _bfd_elf_large_com_section;
2156 /* This is the condition under which finish_dynamic_symbol will be called.
2157 If our finish_dynamic_symbol isn't called, we'll need to do something
2158 about initializing any .plt and .got entries in relocate_section. */
2159 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2161 && ((SHARED) || !(H)->forced_local) \
2162 && ((H)->dynindx != -1 || (H)->forced_local))
2164 /* This macro is to avoid lots of duplicated code in the body
2165 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2166 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2167 r_symndx, symtab_hdr, sym_hashes, \
2168 h, sec, relocation, \
2169 unresolved_reloc, warned) \
2172 /* It seems this can happen with erroneous or unsupported \
2173 input (mixing a.out and elf in an archive, for example.) */ \
2174 if (sym_hashes == NULL) \
2177 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2179 while (h->root.type == bfd_link_hash_indirect \
2180 || h->root.type == bfd_link_hash_warning) \
2181 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2184 unresolved_reloc = FALSE; \
2186 if (h->root.type == bfd_link_hash_defined \
2187 || h->root.type == bfd_link_hash_defweak) \
2189 sec = h->root.u.def.section; \
2191 || sec->output_section == NULL) \
2192 /* Set a flag that will be cleared later if we find a \
2193 relocation value for this symbol. output_section \
2194 is typically NULL for symbols satisfied by a shared \
2196 unresolved_reloc = TRUE; \
2198 relocation = (h->root.u.def.value \
2199 + sec->output_section->vma \
2200 + sec->output_offset); \
2202 else if (h->root.type == bfd_link_hash_undefweak) \
2204 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2205 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2207 else if (!info->relocatable) \
2210 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2211 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2212 if (!info->callbacks->undefined_symbol (info, \
2213 h->root.root.string, \
2216 rel->r_offset, err)) \
2223 /* Will a symbol be bound to the the definition within the shared
2225 #define SYMBOLIC_BIND(INFO, H) \
2226 ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))
2228 #endif /* _LIBELF_H_ */