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 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_size / (shdr)->sh_entsize)
37 /* If size isn't specified as 64 or 32, NAME macro should fail. */
40 #define NAME(x, y) x ## 64 ## _ ## y
43 #define NAME(x, y) x ## 32 ## _ ## y
48 #define NAME(x, y) x ## NOSIZE ## _ ## y
51 #define ElfNAME(X) NAME(Elf,X)
52 #define elfNAME(X) NAME(elf,X)
54 /* Information held for an ELF symbol. The first field is the
55 corresponding asymbol. Every symbol is an ELF file is actually a
56 pointer to this structure, although it is often handled as a
57 pointer to an asymbol. */
63 /* ELF symbol information. */
64 Elf_Internal_Sym internal_elf_sym;
65 /* Backend specific information. */
68 unsigned int hppa_arg_reloc;
74 /* Version information. This is from an Elf_Internal_Versym
75 structure in a SHT_GNU_versym section. It is zero if there is no
76 version information. */
77 unsigned short version;
81 struct elf_strtab_hash;
85 /* ELF linker hash table entries. */
87 struct elf_link_hash_entry
89 struct bfd_link_hash_entry root;
91 /* Symbol index in output file. This is initialized to -1. It is
92 set to -2 if the symbol is used by a reloc. */
95 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
96 -1 if this is not a dynamic symbol. */
97 /* ??? Note that this is consistently used as a synonym for tests
98 against whether we can perform various simplifying transformations
99 to the code. (E.g. changing a pc-relative jump to a PLT entry
100 into a pc-relative jump to the target function.) That test, which
101 is often relatively complex, and someplaces wrong or incomplete,
102 should really be replaced by a predicate in elflink.c.
104 End result: this field -1 does not indicate that the symbol is
105 not in the dynamic symbol table, but rather that the symbol is
106 not visible outside this DSO. */
109 /* If this symbol requires an entry in the global offset table, the
110 processor specific backend uses this field to track usage and
111 final offset. Two schemes are supported: The first assumes that
112 a symbol may only have one GOT entry, and uses REFCOUNT until
113 size_dynamic_sections, at which point the contents of the .got is
114 fixed. Afterward, if OFFSET is -1, then the symbol does not
115 require a global offset table entry. The second scheme allows
116 multiple GOT entries per symbol, managed via a linked list
117 pointed to by GLIST. */
120 bfd_signed_vma refcount;
122 struct got_entry *glist;
123 struct plt_entry *plist;
126 /* Same, but tracks a procedure linkage table entry. */
127 union gotplt_union plt;
132 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
133 unsigned int type : 8;
135 /* Symbol st_other value, symbol visibility. */
136 unsigned int other : 8;
138 /* Symbol is referenced by a non-shared object. */
139 unsigned int ref_regular : 1;
140 /* Symbol is defined by a non-shared object. */
141 unsigned int def_regular : 1;
142 /* Symbol is referenced by a shared object. */
143 unsigned int ref_dynamic : 1;
144 /* Symbol is defined by a shared object. */
145 unsigned int def_dynamic : 1;
146 /* Symbol has a non-weak reference from a non-shared object. */
147 unsigned int ref_regular_nonweak : 1;
148 /* Dynamic symbol has been adjustd. */
149 unsigned int dynamic_adjusted : 1;
150 /* Symbol needs a copy reloc. */
151 unsigned int needs_copy : 1;
152 /* Symbol needs a procedure linkage table entry. */
153 unsigned int needs_plt : 1;
154 /* Symbol appears in a non-ELF input file. */
155 unsigned int non_elf : 1;
156 /* Symbol should be marked as hidden in the version information. */
157 unsigned int hidden : 1;
158 /* Symbol was forced to local scope due to a version script file. */
159 unsigned int forced_local : 1;
160 /* Symbol was forced to be dynamic due to a version script file. */
161 unsigned int dynamic : 1;
162 /* Symbol was marked during garbage collection. */
163 unsigned int mark : 1;
164 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
165 not currently set by all the backends. */
166 unsigned int non_got_ref : 1;
167 /* Symbol has a definition in a shared object.
168 FIXME: There is no real need for this field if def_dynamic is never
169 cleared and all places that test def_dynamic also test def_regular. */
170 unsigned int dynamic_def : 1;
171 /* Symbol is weak in all shared objects. */
172 unsigned int dynamic_weak : 1;
173 /* Symbol is referenced with a relocation where C/C++ pointer equality
175 unsigned int pointer_equality_needed : 1;
177 /* String table index in .dynstr if this is a dynamic symbol. */
178 unsigned long dynstr_index;
182 /* If this is a weak defined symbol from a dynamic object, this
183 field points to a defined symbol with the same value, if there is
184 one. Otherwise it is NULL. */
185 struct elf_link_hash_entry *weakdef;
187 /* Hash value of the name computed using the ELF hash function.
188 Used part way through size_dynamic_sections, after we've finished
190 unsigned long elf_hash_value;
193 /* Version information. */
196 /* This field is used for a symbol which is not defined in a
197 regular object. It points to the version information read in
198 from the dynamic object. */
199 Elf_Internal_Verdef *verdef;
200 /* This field is used for a symbol which is defined in a regular
201 object. It is set up in size_dynamic_sections. It points to
202 the version information we should write out for this symbol. */
203 struct bfd_elf_version_tree *vertree;
208 /* Virtual table entry use information. This array is nominally of size
209 size/sizeof(target_void_pointer), though we have to be able to assume
210 and track a size while the symbol is still undefined. It is indexed
211 via offset/sizeof(target_void_pointer). */
215 /* Virtual table derivation info. */
216 struct elf_link_hash_entry *parent;
220 /* Will references to this symbol always reference the symbol
221 in this object? STV_PROTECTED is excluded from the visibility test
222 here so that function pointer comparisons work properly. Since
223 function symbols not defined in an app are set to their .plt entry,
224 it's necessary for shared libs to also reference the .plt even
225 though the symbol is really local to the shared lib. */
226 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
227 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
229 /* Will _calls_ to this symbol always call the version in this object? */
230 #define SYMBOL_CALLS_LOCAL(INFO, H) \
231 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
233 /* Common symbols that are turned into definitions don't have the
234 DEF_REGULAR flag set, so they might appear to be undefined. */
235 #define ELF_COMMON_DEF_P(H) \
237 && !(H)->def_dynamic \
238 && (H)->root.type == bfd_link_hash_defined)
240 /* Records local symbols to be emitted in the dynamic symbol table. */
242 struct elf_link_local_dynamic_entry
244 struct elf_link_local_dynamic_entry *next;
246 /* The input bfd this symbol came from. */
249 /* The index of the local symbol being copied. */
252 /* The index in the outgoing dynamic symbol table. */
255 /* A copy of the input symbol. */
256 Elf_Internal_Sym isym;
259 struct elf_link_loaded_list
261 struct elf_link_loaded_list *next;
265 /* Structures used by the eh_frame optimization code. */
270 /* If REMOVED == 1, this is the CIE that the FDE originally used.
271 The CIE belongs to the same .eh_frame input section as the FDE.
273 If REMOVED == 0, this is the CIE that we have chosen to use for
274 the output FDE. The CIE's REMOVED field is also 0, but the CIE
275 might belong to a different .eh_frame input section from the FDE. */
276 struct eh_cie_fde *cie_inf;
277 struct eh_cie_fde *next_for_section;
280 /* CIEs have three states:
282 - REMOVED && !MERGED: Slated for removal because we haven't yet
283 proven that an FDE needs it. FULL_CIE, if nonnull, points to
284 more detailed information about the CIE.
286 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
287 which may not belong to the same input section.
289 - !REMOVED: We have decided to keep this CIE. SEC is the
290 .eh_frame input section that contains the CIE. */
292 struct cie *full_cie;
293 struct eh_cie_fde *merged_with;
297 /* True if we have marked relocations associated with this CIE. */
298 unsigned int gc_mark : 1;
300 /* True if we have decided to turn an absolute LSDA encoding into
301 a PC-relative one. */
302 unsigned int make_lsda_relative : 1;
304 /* True if the CIE contains personality data and if that data
305 uses a PC-relative encoding. */
306 unsigned int per_encoding_relative : 1;
308 /* True if we need to add an 'R' (FDE encoding) entry to the
309 CIE's augmentation data. */
310 unsigned int add_fde_encoding : 1;
312 /* True if we have merged this CIE with another. */
313 unsigned int merged : 1;
316 unsigned int reloc_index;
319 unsigned int new_offset;
320 unsigned int fde_encoding : 8;
321 unsigned int lsda_encoding : 8;
322 unsigned int lsda_offset : 8;
324 /* True if this entry represents a CIE, false if it represents an FDE. */
325 unsigned int cie : 1;
327 /* True if this entry is currently marked for removal. */
328 unsigned int removed : 1;
330 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
331 augmentation data, and an associated byte to each of the CIE's FDEs. */
332 unsigned int add_augmentation_size : 1;
334 /* True if we have decided to convert absolute FDE relocations into
335 relative ones. This applies to the first relocation in the FDE,
336 which is against the code that the FDE describes. */
337 unsigned int make_relative : 1;
340 unsigned int pad1 : 4;
342 unsigned int *set_loc;
345 struct eh_frame_sec_info
349 struct eh_cie_fde entry[1];
352 struct eh_frame_array_ent
360 struct eh_frame_hdr_info
364 unsigned int fde_count, array_count;
365 struct eh_frame_array_ent *array;
366 /* TRUE if we should try to merge CIEs between input sections. */
367 bfd_boolean merge_cies;
368 /* TRUE if all .eh_frames have been parsd. */
369 bfd_boolean parsed_eh_frames;
370 /* TRUE if .eh_frame_hdr should contain the sorted search table.
371 We build it if we successfully read all .eh_frame input sections
372 and recognize them. */
376 /* ELF linker hash table. */
378 struct elf_link_hash_table
380 struct bfd_link_hash_table root;
382 /* Whether we have created the special dynamic sections required
383 when linking against or generating a shared object. */
384 bfd_boolean dynamic_sections_created;
386 /* True if this target has relocatable executables, so needs dynamic
388 bfd_boolean is_relocatable_executable;
390 /* The BFD used to hold special sections created by the linker.
391 This will be the first BFD found which requires these sections to
395 /* The value to use when initialising got.refcount/offset and
396 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
397 the values are refcounts. Set to init_got_offset/init_plt_offset
398 in size_dynamic_sections when the values may be offsets. */
399 union gotplt_union init_got_refcount;
400 union gotplt_union init_plt_refcount;
402 /* The value to use for got.refcount/offset and plt.refcount/offset
403 when the values may be offsets. Normally (bfd_vma) -1. */
404 union gotplt_union init_got_offset;
405 union gotplt_union init_plt_offset;
407 /* The number of symbols found in the link which must be put into
408 the .dynsym section. */
409 bfd_size_type dynsymcount;
411 /* The string table of dynamic symbols, which becomes the .dynstr
413 struct elf_strtab_hash *dynstr;
415 /* The number of buckets in the hash table in the .hash section.
416 This is based on the number of dynamic symbols. */
417 bfd_size_type bucketcount;
419 /* A linked list of DT_NEEDED names found in dynamic objects
420 included in the link. */
421 struct bfd_link_needed_list *needed;
423 /* Sections in the output bfd that provides a section symbol
424 to be used by relocations emitted against local symbols.
425 Most targets will not use data_index_section. */
426 asection *text_index_section;
427 asection *data_index_section;
429 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
430 struct elf_link_hash_entry *hgot;
432 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
433 struct elf_link_hash_entry *hplt;
435 /* A pointer to information used to merge SEC_MERGE sections. */
438 /* Used to link stabs in sections. */
439 struct stab_info stab_info;
441 /* Used by eh_frame code when editing .eh_frame. */
442 struct eh_frame_hdr_info eh_info;
444 /* A linked list of local symbols to be added to .dynsym. */
445 struct elf_link_local_dynamic_entry *dynlocal;
447 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
448 objects included in the link. */
449 struct bfd_link_needed_list *runpath;
451 /* Cached first output tls section and size of PT_TLS segment. */
453 bfd_size_type tls_size;
455 /* A linked list of BFD's loaded in the link. */
456 struct elf_link_loaded_list *loaded;
459 /* Look up an entry in an ELF linker hash table. */
461 #define elf_link_hash_lookup(table, string, create, copy, follow) \
462 ((struct elf_link_hash_entry *) \
463 bfd_link_hash_lookup (&(table)->root, (string), (create), \
466 /* Traverse an ELF linker hash table. */
468 #define elf_link_hash_traverse(table, func, info) \
469 (bfd_link_hash_traverse \
471 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
474 /* Get the ELF linker hash table from a link_info structure. */
476 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
478 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
479 #define is_elf_hash_table(htab) \
480 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
482 /* Used by bfd_section_from_r_symndx to cache a small number of local
483 symbol to section mappings. */
484 #define LOCAL_SYM_CACHE_SIZE 32
488 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
489 unsigned int shndx[LOCAL_SYM_CACHE_SIZE];
492 /* Constant information held for an ELF backend. */
494 struct elf_size_info {
495 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
496 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
498 /* The size of entries in the .hash section. */
499 unsigned char sizeof_hash_entry;
501 /* The number of internal relocations to allocate per external
503 unsigned char int_rels_per_ext_rel;
504 /* We use some fixed size arrays. This should be large enough to
505 handle all back-ends. */
506 #define MAX_INT_RELS_PER_EXT_REL 3
508 unsigned char arch_size, log_file_align;
509 unsigned char elfclass, ev_current;
510 int (*write_out_phdrs)
511 (bfd *, const Elf_Internal_Phdr *, unsigned int);
513 (*write_shdrs_and_ehdr) (bfd *);
514 bfd_boolean (*checksum_contents)
515 (bfd * , void (*) (const void *, size_t, void *), void *);
517 (bfd *, asection *, void *);
518 bfd_boolean (*swap_symbol_in)
519 (bfd *, const void *, const void *, Elf_Internal_Sym *);
520 void (*swap_symbol_out)
521 (bfd *, const Elf_Internal_Sym *, void *, void *);
522 bfd_boolean (*slurp_reloc_table)
523 (bfd *, asection *, asymbol **, bfd_boolean);
524 long (*slurp_symbol_table)
525 (bfd *, asymbol **, bfd_boolean);
527 (bfd *, const void *, Elf_Internal_Dyn *);
529 (bfd *, const Elf_Internal_Dyn *, void *);
531 /* This function is called to swap in a REL relocation. If an
532 external relocation corresponds to more than one internal
533 relocation, then all relocations are swapped in at once. */
534 void (*swap_reloc_in)
535 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
537 /* This function is called to swap out a REL relocation. */
538 void (*swap_reloc_out)
539 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
541 /* This function is called to swap in a RELA relocation. If an
542 external relocation corresponds to more than one internal
543 relocation, then all relocations are swapped in at once. */
544 void (*swap_reloca_in)
545 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
547 /* This function is called to swap out a RELA relocation. */
548 void (*swap_reloca_out)
549 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
552 #define elf_symbol_from(ABFD,S) \
553 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
554 && (S)->the_bfd->tdata.elf_obj_data != 0) \
555 ? (elf_symbol_type *) (S) \
558 enum elf_reloc_type_class {
560 reloc_class_relative,
565 struct elf_reloc_cookie
567 Elf_Internal_Rela *rels, *rel, *relend;
568 Elf_Internal_Sym *locsyms;
572 struct elf_link_hash_entry **sym_hashes;
574 bfd_boolean bad_symtab;
577 /* The level of IRIX compatibility we're striving for. */
585 /* Mapping of ELF section names and types. */
586 struct bfd_elf_special_section
590 /* 0 means name must match PREFIX exactly.
591 -1 means name must start with PREFIX followed by an arbitrary string.
592 -2 means name must match PREFIX exactly or consist of PREFIX followed
593 by a dot then anything.
594 > 0 means name must start with the first PREFIX_LENGTH chars of
595 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
601 enum action_discarded
607 typedef asection * (*elf_gc_mark_hook_fn)
608 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
609 struct elf_link_hash_entry *, Elf_Internal_Sym *);
611 struct elf_backend_data
613 /* The architecture for this backend. */
614 enum bfd_architecture arch;
616 /* The ELF machine code (EM_xxxx) for this backend. */
617 int elf_machine_code;
622 /* The maximum page size for this backend. */
625 /* The minimum page size for this backend. An input object will not be
626 considered page aligned unless its sections are correctly aligned for
627 pages at least this large. May be smaller than maxpagesize. */
630 /* The common page size for this backend. */
631 bfd_vma commonpagesize;
633 /* The BFD flags applied to sections created for dynamic linking. */
634 flagword dynamic_sec_flags;
636 /* A function to translate an ELF RELA relocation to a BFD arelent
638 void (*elf_info_to_howto)
639 (bfd *, arelent *, Elf_Internal_Rela *);
641 /* A function to translate an ELF REL relocation to a BFD arelent
643 void (*elf_info_to_howto_rel)
644 (bfd *, arelent *, Elf_Internal_Rela *);
646 /* A function to determine whether a symbol is global when
647 partitioning the symbol table into local and global symbols.
648 This should be NULL for most targets, in which case the correct
649 thing will be done. MIPS ELF, at least on the Irix 5, has
650 special requirements. */
651 bfd_boolean (*elf_backend_sym_is_global)
654 /* The remaining functions are hooks which are called only if they
657 /* A function to permit a backend specific check on whether a
658 particular BFD format is relevant for an object file, and to
659 permit the backend to set any global information it wishes. When
660 this is called elf_elfheader is set, but anything else should be
661 used with caution. If this returns FALSE, the check_format
662 routine will return a bfd_error_wrong_format error. */
663 bfd_boolean (*elf_backend_object_p)
666 /* A function to do additional symbol processing when reading the
667 ELF symbol table. This is where any processor-specific special
668 section indices are handled. */
669 void (*elf_backend_symbol_processing)
672 /* A function to do additional symbol processing after reading the
673 entire ELF symbol table. */
674 bfd_boolean (*elf_backend_symbol_table_processing)
675 (bfd *, elf_symbol_type *, unsigned int);
677 /* A function to set the type of the info field. Processor-specific
678 types should be handled here. */
679 int (*elf_backend_get_symbol_type)
680 (Elf_Internal_Sym *, int);
682 /* A function to return the linker hash table entry of a symbol that
683 might be satisfied by an archive symbol. */
684 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
685 (bfd *, struct bfd_link_info *, const char *);
687 /* Return true if local section symbols should have a non-null st_name.
688 NULL implies false. */
689 bfd_boolean (*elf_backend_name_local_section_symbols)
692 /* A function to do additional processing on the ELF section header
693 just before writing it out. This is used to set the flags and
694 type fields for some sections, or to actually write out data for
696 bfd_boolean (*elf_backend_section_processing)
697 (bfd *, Elf_Internal_Shdr *);
699 /* A function to handle unusual section types when creating BFD
700 sections from ELF sections. */
701 bfd_boolean (*elf_backend_section_from_shdr)
702 (bfd *, Elf_Internal_Shdr *, const char *, int);
704 /* A function to convert machine dependent ELF section header flags to
705 BFD internal section header flags. */
706 bfd_boolean (*elf_backend_section_flags)
707 (flagword *, const Elf_Internal_Shdr *);
709 /* A function that returns a struct containing ELF section flags and
710 type for the given BFD section. */
711 const struct bfd_elf_special_section * (*get_sec_type_attr)
714 /* A function to handle unusual program segment types when creating BFD
715 sections from ELF program segments. */
716 bfd_boolean (*elf_backend_section_from_phdr)
717 (bfd *, Elf_Internal_Phdr *, int, const char *);
719 /* A function to set up the ELF section header for a BFD section in
720 preparation for writing it out. This is where the flags and type
721 fields are set for unusual sections. */
722 bfd_boolean (*elf_backend_fake_sections)
723 (bfd *, Elf_Internal_Shdr *, asection *);
725 /* A function to get the ELF section index for a BFD section. If
726 this returns TRUE, the section was found. If it is a normal ELF
727 section, *RETVAL should be left unchanged. If it is not a normal
728 ELF section *RETVAL should be set to the SHN_xxxx index. */
729 bfd_boolean (*elf_backend_section_from_bfd_section)
730 (bfd *, asection *, int *retval);
732 /* If this field is not NULL, it is called by the add_symbols phase
733 of a link just before adding a symbol to the global linker hash
734 table. It may modify any of the fields as it wishes. If *NAME
735 is set to NULL, the symbol will be skipped rather than being
736 added to the hash table. This function is responsible for
737 handling all processor dependent symbol bindings and section
738 indices, and must set at least *FLAGS and *SEC for each processor
739 dependent case; failure to do so will cause a link error. */
740 bfd_boolean (*elf_add_symbol_hook)
741 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
742 const char **name, flagword *flags, asection **sec, bfd_vma *value);
744 /* If this field is not NULL, it is called by the elf_link_output_sym
745 phase of a link for each symbol which will appear in the object file. */
746 bfd_boolean (*elf_backend_link_output_symbol_hook)
747 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
748 asection *, struct elf_link_hash_entry *);
750 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
751 linker the first time it encounters a dynamic object in the link.
752 This function must create any sections required for dynamic
753 linking. The ABFD argument is a dynamic object. The .interp,
754 .dynamic, .dynsym, .dynstr, and .hash functions have already been
755 created, and this function may modify the section flags if
756 desired. This function will normally create the .got and .plt
757 sections, but different backends have different requirements. */
758 bfd_boolean (*elf_backend_create_dynamic_sections)
759 (bfd *abfd, struct bfd_link_info *info);
761 /* When creating a shared library, determine whether to omit the
762 dynamic symbol for the section. */
763 bfd_boolean (*elf_backend_omit_section_dynsym)
764 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
766 /* Return TRUE if relocations of targets are compatible to the extent
767 that CHECK_RELOCS will properly process them. PR 4424. */
768 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
770 /* The CHECK_RELOCS function is called by the add_symbols phase of
771 the ELF backend linker. It is called once for each section with
772 relocs of an object file, just after the symbols for the object
773 file have been added to the global linker hash table. The
774 function must look through the relocs and do any special handling
775 required. This generally means allocating space in the global
776 offset table, and perhaps allocating space for a reloc. The
777 relocs are always passed as Rela structures; if the section
778 actually uses Rel structures, the r_addend field will always be
780 bfd_boolean (*check_relocs)
781 (bfd *abfd, struct bfd_link_info *info, asection *o,
782 const Elf_Internal_Rela *relocs);
784 /* The CHECK_DIRECTIVES function is called once per input file by
785 the add_symbols phase of the ELF backend linker. The function
786 must inspect the bfd and create any additional symbols according
787 to any custom directives in the bfd. */
788 bfd_boolean (*check_directives)
789 (bfd *abfd, struct bfd_link_info *info);
791 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
792 input file that was not needed by the add_symbols phase of the
793 ELF backend linker. The function must undo any target specific
794 changes in the symbol hash table. */
795 bfd_boolean (*as_needed_cleanup)
796 (bfd *abfd, struct bfd_link_info *info);
798 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
799 linker for every symbol which is defined by a dynamic object and
800 referenced by a regular object. This is called after all the
801 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
802 function has been called. The hash table entry should be
803 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
804 defined in a section from a dynamic object. Dynamic object
805 sections are not included in the final link, and this function is
806 responsible for changing the value to something which the rest of
807 the link can deal with. This will normally involve adding an
808 entry to the .plt or .got or some such section, and setting the
809 symbol to point to that. */
810 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
811 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
813 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
814 after all the linker input files have been seen but before the
815 section sizes have been set. This is called after
816 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
817 bfd_boolean (*elf_backend_always_size_sections)
818 (bfd *output_bfd, struct bfd_link_info *info);
820 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
821 linker after all the linker input files have been seen but before
822 the sections sizes have been set. This is called after
823 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
824 It is only called when linking against a dynamic object. It must
825 set the sizes of the dynamic sections, and may fill in their
826 contents as well. The generic ELF linker can handle the .dynsym,
827 .dynstr and .hash sections. This function must handle the
828 .interp section and any sections created by the
829 CREATE_DYNAMIC_SECTIONS entry point. */
830 bfd_boolean (*elf_backend_size_dynamic_sections)
831 (bfd *output_bfd, struct bfd_link_info *info);
833 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
834 we keep to use as a base for relocs and symbols. */
835 void (*elf_backend_init_index_section)
836 (bfd *output_bfd, struct bfd_link_info *info);
838 /* The RELOCATE_SECTION function is called by the ELF backend linker
839 to handle the relocations for a section.
841 The relocs are always passed as Rela structures; if the section
842 actually uses Rel structures, the r_addend field will always be
845 This function is responsible for adjust the section contents as
846 necessary, and (if using Rela relocs and generating a
847 relocatable output file) adjusting the reloc addend as
850 This function does not have to worry about setting the reloc
851 address or the reloc symbol index.
853 LOCAL_SYMS is a pointer to the swapped in local symbols.
855 LOCAL_SECTIONS is an array giving the section in the input file
856 corresponding to the st_shndx field of each local symbol.
858 The global hash table entry for the global symbols can be found
859 via elf_sym_hashes (input_bfd).
861 When generating relocatable output, this function must handle
862 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
863 going to be the section symbol corresponding to the output
864 section, which means that the addend must be adjusted
867 Returns FALSE on error, TRUE on success, 2 if successful and
868 relocations should be written for this section. */
869 int (*elf_backend_relocate_section)
870 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
871 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
872 Elf_Internal_Sym *local_syms, asection **local_sections);
874 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
875 linker just before it writes a symbol out to the .dynsym section.
876 The processor backend may make any required adjustment to the
877 symbol. It may also take the opportunity to set contents of the
878 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
879 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
880 on those symbols which are defined by a dynamic object. */
881 bfd_boolean (*elf_backend_finish_dynamic_symbol)
882 (bfd *output_bfd, struct bfd_link_info *info,
883 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
885 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
886 linker just before it writes all the dynamic sections out to the
887 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
888 all dynamic symbols. */
889 bfd_boolean (*elf_backend_finish_dynamic_sections)
890 (bfd *output_bfd, struct bfd_link_info *info);
892 /* A function to do any beginning processing needed for the ELF file
893 before building the ELF headers and computing file positions. */
894 void (*elf_backend_begin_write_processing)
895 (bfd *, struct bfd_link_info *);
897 /* A function to do any final processing needed for the ELF file
898 before writing it out. The LINKER argument is TRUE if this BFD
899 was created by the ELF backend linker. */
900 void (*elf_backend_final_write_processing)
901 (bfd *, bfd_boolean linker);
903 /* This function is called by get_program_header_size. It should
904 return the number of additional program segments which this BFD
905 will need. It should return -1 on error. */
906 int (*elf_backend_additional_program_headers)
907 (bfd *, struct bfd_link_info *);
909 /* This function is called to modify an existing segment map in a
910 backend specific fashion. */
911 bfd_boolean (*elf_backend_modify_segment_map)
912 (bfd *, struct bfd_link_info *);
914 /* This function is called to modify program headers just before
916 bfd_boolean (*elf_backend_modify_program_headers)
917 (bfd *, struct bfd_link_info *);
919 /* This function is called before section garbage collection to
920 mark entry symbol sections. */
922 (struct bfd_link_info *);
924 /* This function is called during section garbage collection to
925 mark sections that define global symbols. */
926 bfd_boolean (*gc_mark_dynamic_ref)
927 (struct elf_link_hash_entry *, void *);
929 /* This function is called during section gc to discover the section a
930 particular relocation refers to. */
931 elf_gc_mark_hook_fn gc_mark_hook;
933 /* This function, if defined, is called after the first gc marking pass
934 to allow the backend to mark additional sections. */
935 bfd_boolean (*gc_mark_extra_sections)
936 (struct bfd_link_info *, elf_gc_mark_hook_fn);
938 /* This function, if defined, is called during the sweep phase of gc
939 in order that a backend might update any data structures it might
941 bfd_boolean (*gc_sweep_hook)
942 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
944 /* This function, if defined, is called after the ELF headers have
945 been created. This allows for things like the OS and ABI versions
947 void (*elf_backend_post_process_headers)
948 (bfd *, struct bfd_link_info *);
950 /* This function, if defined, prints a symbol to file and returns the
951 name of the symbol to be printed. It should return NULL to fall
952 back to default symbol printing. */
953 const char *(*elf_backend_print_symbol_all)
954 (bfd *, void *, asymbol *);
956 /* This function, if defined, is called after all local symbols and
957 global symbols converted to locals are emitted into the symtab
958 section. It allows the backend to emit special local symbols
959 not handled in the hash table. */
960 bfd_boolean (*elf_backend_output_arch_local_syms)
961 (bfd *, struct bfd_link_info *, void *,
962 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
963 struct elf_link_hash_entry *));
965 /* This function, if defined, is called after all symbols are emitted
966 into the symtab section. It allows the backend to emit special
967 global symbols not handled in the hash table. */
968 bfd_boolean (*elf_backend_output_arch_syms)
969 (bfd *, struct bfd_link_info *, void *,
970 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
971 struct elf_link_hash_entry *));
973 /* Copy any information related to dynamic linking from a pre-existing
974 symbol to a newly created symbol. Also called to copy flags and
975 other back-end info to a weakdef, in which case the symbol is not
976 newly created and plt/got refcounts and dynamic indices should not
978 void (*elf_backend_copy_indirect_symbol)
979 (struct bfd_link_info *, struct elf_link_hash_entry *,
980 struct elf_link_hash_entry *);
982 /* Modify any information related to dynamic linking such that the
983 symbol is not exported. */
984 void (*elf_backend_hide_symbol)
985 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
987 /* A function to do additional symbol fixup, called by
988 _bfd_elf_fix_symbol_flags. */
989 bfd_boolean (*elf_backend_fixup_symbol)
990 (struct bfd_link_info *, struct elf_link_hash_entry *);
992 /* Merge the backend specific symbol attribute. */
993 void (*elf_backend_merge_symbol_attribute)
994 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
997 /* This function, if defined, will return a string containing the
998 name of a target-specific dynamic tag. */
999 char *(*elf_backend_get_target_dtag)
1002 /* Decide whether an undefined symbol is special and can be ignored.
1003 This is the case for OPTIONAL symbols on IRIX. */
1004 bfd_boolean (*elf_backend_ignore_undef_symbol)
1005 (struct elf_link_hash_entry *);
1007 /* Emit relocations. Overrides default routine for emitting relocs,
1008 except during a relocatable link, or if all relocs are being emitted. */
1009 bfd_boolean (*elf_backend_emit_relocs)
1010 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1011 struct elf_link_hash_entry **);
1013 /* Count relocations. Not called for relocatable links
1014 or if all relocs are being preserved in the output. */
1015 unsigned int (*elf_backend_count_relocs)
1016 (struct bfd_link_info *, asection *);
1018 /* This function, if defined, is called when an NT_PRSTATUS note is found
1020 bfd_boolean (*elf_backend_grok_prstatus)
1021 (bfd *, Elf_Internal_Note *);
1023 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1024 note is found in a core file. */
1025 bfd_boolean (*elf_backend_grok_psinfo)
1026 (bfd *, Elf_Internal_Note *);
1028 /* This function, if defined, is called to write a note to a corefile. */
1029 char *(*elf_backend_write_core_note)
1030 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1032 /* This function returns class of a reloc type. */
1033 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1034 (const Elf_Internal_Rela *);
1036 /* This function, if defined, removes information about discarded functions
1037 from other sections which mention them. */
1038 bfd_boolean (*elf_backend_discard_info)
1039 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1041 /* This function, if defined, signals that the function above has removed
1042 the discarded relocations for this section. */
1043 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1046 /* What to do when ld finds relocations against symbols defined in
1047 discarded sections. */
1048 unsigned int (*action_discarded)
1051 /* This function returns the width of FDE pointers in bytes, or 0 if
1052 that can't be determined for some reason. The default definition
1053 goes by the bfd's EI_CLASS. */
1054 unsigned int (*elf_backend_eh_frame_address_size)
1055 (bfd *, asection *);
1057 /* These functions tell elf-eh-frame whether to attempt to turn
1058 absolute or lsda encodings into pc-relative ones. The default
1059 definition enables these transformations. */
1060 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1061 (bfd *, struct bfd_link_info *, asection *);
1062 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1063 (bfd *, struct bfd_link_info *, asection *);
1065 /* This function returns an encoding after computing the encoded
1066 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1067 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1068 The default definition chooses a 32-bit PC-relative encoding. */
1069 bfd_byte (*elf_backend_encode_eh_address)
1070 (bfd *abfd, struct bfd_link_info *info,
1071 asection *osec, bfd_vma offset,
1072 asection *loc_sec, bfd_vma loc_offset,
1075 /* This function, if defined, may write out the given section.
1076 Returns TRUE if it did so and FALSE if the caller should. */
1077 bfd_boolean (*elf_backend_write_section)
1078 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1080 /* The level of IRIX compatibility we're striving for.
1081 MIPS ELF specific function. */
1082 irix_compat_t (*elf_backend_mips_irix_compat)
1085 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1086 (unsigned int, bfd_boolean);
1088 /* The swapping table to use when dealing with ECOFF information.
1089 Used for the MIPS ELF .mdebug section. */
1090 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1092 /* This function implements `bfd_elf_bfd_from_remote_memory';
1093 see elf.c, elfcode.h. */
1094 bfd *(*elf_backend_bfd_from_remote_memory)
1095 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1096 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
1098 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1100 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1102 /* Is symbol defined in common section? */
1103 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1105 /* Return a common section index for section. */
1106 unsigned int (*common_section_index) (asection *);
1108 /* Return a common section for section. */
1109 asection *(*common_section) (asection *);
1111 /* Return TRUE if we can merge 2 definitions. */
1112 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1113 struct elf_link_hash_entry **,
1114 struct elf_link_hash_entry *,
1115 Elf_Internal_Sym *, asection **,
1116 bfd_vma *, unsigned int *,
1117 bfd_boolean *, bfd_boolean *,
1118 bfd_boolean *, bfd_boolean *,
1119 bfd_boolean *, bfd_boolean *,
1120 bfd_boolean *, bfd_boolean *,
1122 bfd_boolean *, bfd_boolean *,
1123 bfd_boolean *, bfd_boolean *,
1124 bfd *, asection **);
1126 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1127 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1129 /* Return TRUE if type is a function symbol type. */
1130 bfd_boolean (*is_function_type) (unsigned int type);
1132 /* Used to handle bad SHF_LINK_ORDER input. */
1133 bfd_error_handler_type link_order_error_handler;
1135 /* Name of the PLT relocation section. */
1136 const char *relplt_name;
1138 /* Alternate EM_xxxx machine codes for this backend. */
1139 int elf_machine_alt1;
1140 int elf_machine_alt2;
1142 const struct elf_size_info *s;
1144 /* An array of target specific special sections. */
1145 const struct bfd_elf_special_section *special_sections;
1147 /* The size in bytes of the header for the GOT. This includes the
1148 so-called reserved entries on some systems. */
1149 bfd_vma got_header_size;
1151 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1152 otherwise by the local symbol with index SYMNDX in IBFD. */
1153 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1154 struct elf_link_hash_entry *h,
1155 bfd *ibfd, unsigned long symndx);
1157 /* The vendor name to use for a processor-standard attributes section. */
1158 const char *obj_attrs_vendor;
1160 /* The section name to use for a processor-standard attributes section. */
1161 const char *obj_attrs_section;
1163 /* Return 1, 2 or 3 to indicate what type of arguments a
1164 processor-specific tag takes. */
1165 int (*obj_attrs_arg_type) (int);
1167 /* The section type to use for an attributes section. */
1168 unsigned int obj_attrs_section_type;
1170 /* This function determines the order in which any attributes are written.
1171 It must be defined for input in the range 4..NUM_KNOWN_OBJ_ATTRIBUTES-1
1172 (this range is used in order to make unity easy). The returned value is
1173 the actual tag number to place in the input position. */
1174 int (*obj_attrs_order) (int);
1176 /* This is TRUE if the linker should act like collect and gather
1177 global constructors and destructors by name. This is TRUE for
1178 MIPS ELF because the Irix 5 tools can not handle the .init
1180 unsigned collect : 1;
1182 /* This is TRUE if the linker should ignore changes to the type of a
1183 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1184 record undefined functions as STT_OBJECT although the definitions
1186 unsigned type_change_ok : 1;
1188 /* Whether the backend may use REL relocations. (Some backends use
1189 both REL and RELA relocations, and this flag is set for those
1191 unsigned may_use_rel_p : 1;
1193 /* Whether the backend may use RELA relocations. (Some backends use
1194 both REL and RELA relocations, and this flag is set for those
1196 unsigned may_use_rela_p : 1;
1198 /* Whether the default relocation type is RELA. If a backend with
1199 this flag set wants REL relocations for a particular section,
1200 it must note that explicitly. Similarly, if this flag is clear,
1201 and the backend wants RELA relocations for a particular
1203 unsigned default_use_rela_p : 1;
1205 /* True if PLT and copy relocations should be RELA by default. */
1206 unsigned rela_plts_and_copies_p : 1;
1208 /* Set if RELA relocations for a relocatable link can be handled by
1209 generic code. Backends that set this flag need do nothing in the
1210 backend relocate_section routine for relocatable linking. */
1211 unsigned rela_normal : 1;
1213 /* TRUE if addresses "naturally" sign extend. This is used when
1214 swapping in from Elf32 when BFD64. */
1215 unsigned sign_extend_vma : 1;
1217 unsigned want_got_plt : 1;
1218 unsigned plt_readonly : 1;
1219 unsigned want_plt_sym : 1;
1220 unsigned plt_not_loaded : 1;
1221 unsigned plt_alignment : 4;
1222 unsigned can_gc_sections : 1;
1223 unsigned can_refcount : 1;
1224 unsigned want_got_sym : 1;
1225 unsigned want_dynbss : 1;
1227 /* Targets which do not support physical addressing often require
1228 that the p_paddr field in the section header to be set to zero.
1229 This field indicates whether this behavior is required. */
1230 unsigned want_p_paddr_set_to_zero : 1;
1232 /* True if an object file lacking a .note.GNU-stack section
1233 should be assumed to be requesting exec stack. At least one
1234 other file in the link needs to have a .note.GNU-stack section
1235 for a PT_GNU_STACK segment to be created. */
1236 unsigned default_execstack : 1;
1239 /* Information stored for each BFD section in an ELF file. This
1240 structure is allocated by elf_new_section_hook. */
1242 struct bfd_elf_section_data
1244 /* The ELF header for this section. */
1245 Elf_Internal_Shdr this_hdr;
1247 /* The ELF header for the reloc section associated with this
1249 Elf_Internal_Shdr rel_hdr;
1251 /* If there is a second reloc section associated with this section,
1252 as can happen on Irix 6, this field points to the header. */
1253 Elf_Internal_Shdr *rel_hdr2;
1255 /* The number of relocations currently assigned to REL_HDR. */
1256 unsigned int rel_count;
1258 /* The number of relocations currently assigned to REL_HDR2. */
1259 unsigned int rel_count2;
1261 /* The ELF section number of this section. */
1264 /* The ELF section number of the reloc section indicated by
1265 REL_HDR if any. Only used for an output file. */
1268 /* The ELF section number of the reloc section indicated by
1269 REL_HDR2 if any. Only used for an output file. */
1272 /* Used by the backend linker when generating a shared library to
1273 record the dynamic symbol index for a section symbol
1274 corresponding to this section. A value of 0 means that there is
1275 no dynamic symbol for this section. */
1278 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1279 asection *linked_to;
1281 /* Used by the backend linker to store the symbol hash table entries
1282 associated with relocs against global symbols. */
1283 struct elf_link_hash_entry **rel_hashes;
1285 /* A pointer to the swapped relocs. If the section uses REL relocs,
1286 rather than RELA, all the r_addend fields will be zero. This
1287 pointer may be NULL. It is used by the backend linker. */
1288 Elf_Internal_Rela *relocs;
1290 /* A pointer to a linked list tracking dynamic relocs copied for
1294 /* A pointer to the bfd section used for dynamic relocs. */
1298 /* Group name, if this section is a member of a group. */
1301 /* Group signature sym, if this is the SHT_GROUP section. */
1302 struct bfd_symbol *id;
1305 /* For a member of a group, points to the SHT_GROUP section.
1306 NULL for the SHT_GROUP section itself and non-group sections. */
1307 asection *sec_group;
1309 /* A linked list of member sections in the group. Circular when used by
1310 the linker. For the SHT_GROUP section, points at first member. */
1311 asection *next_in_group;
1313 /* The FDEs associated with this section. The u.fde.next_in_section
1314 field acts as a chain pointer. */
1315 struct eh_cie_fde *fde_list;
1317 /* A pointer used for various section optimizations. */
1321 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1322 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1323 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1324 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1325 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1326 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1327 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1328 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1329 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1331 #define xvec_get_elf_backend_data(xvec) \
1332 ((const struct elf_backend_data *) (xvec)->backend_data)
1334 #define get_elf_backend_data(abfd) \
1335 xvec_get_elf_backend_data ((abfd)->xvec)
1337 /* This struct is used to pass information to routines called via
1338 elf_link_hash_traverse which must return failure. */
1340 struct elf_info_failed
1343 struct bfd_link_info *info;
1344 struct bfd_elf_version_tree *verdefs;
1347 /* This structure is used to pass information to
1348 _bfd_elf_link_assign_sym_version. */
1350 struct elf_assign_sym_version_info
1354 /* General link information. */
1355 struct bfd_link_info *info;
1357 struct bfd_elf_version_tree *verdefs;
1358 /* Whether we had a failure. */
1362 /* This structure is used to pass information to
1363 _bfd_elf_link_find_version_dependencies. */
1365 struct elf_find_verdep_info
1369 /* General link information. */
1370 struct bfd_link_info *info;
1371 /* The number of dependencies. */
1373 /* Whether we had a failure. */
1377 /* The maximum number of known object attributes for any target. */
1378 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1380 /* The value of an object attribute. The type indicates whether the attribute
1381 holds and integer, a string, or both. It can also indicate that there can
1382 be no default (i.e. all values must be written to file, even zero). */
1384 typedef struct obj_attribute
1386 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1387 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1388 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1390 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1391 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1392 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1399 typedef struct obj_attribute_list
1401 struct obj_attribute_list *next;
1404 } obj_attribute_list;
1406 /* Object attributes may either be defined by the processor ABI, index
1407 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1408 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1409 #define OBJ_ATTR_PROC 0
1410 #define OBJ_ATTR_GNU 1
1411 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1412 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1414 /* The following object attribute tags are taken as generic, for all
1415 targets and for "gnu" where there is no target standard. */
1422 Tag_compatibility = 32
1425 /* Enum used to identify target specific extensions to the elf_obj_tdata
1426 structure. Note the enums deliberately start from 1 so that we can
1427 detect an uninitialized field. The generic value is last so that
1428 additions to this enum do not need to modify more than one line. */
1431 ALPHA_ELF_TDATA = 1,
1446 /* Some private data is stashed away for future use using the tdata pointer
1447 in the bfd structure. */
1449 struct elf_obj_tdata
1451 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1452 Elf_Internal_Shdr **elf_sect_ptr;
1453 Elf_Internal_Phdr *phdr;
1454 struct elf_segment_map *segment_map;
1455 struct elf_strtab_hash *strtab_ptr;
1458 unsigned int num_elf_sections; /* elf_sect_ptr size */
1459 int num_section_syms;
1460 asymbol **section_syms; /* STT_SECTION symbols for each section */
1461 Elf_Internal_Shdr symtab_hdr;
1462 Elf_Internal_Shdr shstrtab_hdr;
1463 Elf_Internal_Shdr strtab_hdr;
1464 Elf_Internal_Shdr dynsymtab_hdr;
1465 Elf_Internal_Shdr dynstrtab_hdr;
1466 Elf_Internal_Shdr dynversym_hdr;
1467 Elf_Internal_Shdr dynverref_hdr;
1468 Elf_Internal_Shdr dynverdef_hdr;
1469 Elf_Internal_Shdr symtab_shndx_hdr;
1470 unsigned int symtab_section, shstrtab_section;
1471 unsigned int strtab_section, dynsymtab_section;
1472 unsigned int symtab_shndx_section;
1473 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1474 file_ptr next_file_pos;
1475 bfd_vma gp; /* The gp value */
1476 unsigned int gp_size; /* The gp size */
1478 /* Information grabbed from an elf core file. */
1485 /* A mapping from external symbols to entries in the linker hash
1486 table, used when linking. This is indexed by the symbol index
1487 minus the sh_info field of the symbol table header. */
1488 struct elf_link_hash_entry **sym_hashes;
1490 /* Track usage and final offsets of GOT entries for local symbols.
1491 This array is indexed by symbol index. Elements are used
1492 identically to "got" in struct elf_link_hash_entry. */
1495 bfd_signed_vma *refcounts;
1497 struct got_entry **ents;
1500 /* The linker ELF emulation code needs to let the backend ELF linker
1501 know what filename should be used for a dynamic object if the
1502 dynamic object is found using a search. The emulation code then
1503 sometimes needs to know what name was actually used. Until the
1504 file has been added to the linker symbol table, this field holds
1505 the name the linker wants. After it has been added, it holds the
1506 name actually used, which will be the DT_SONAME entry if there is
1508 const char *dt_name;
1510 /* Records the result of `get_program_header_size'. */
1511 bfd_size_type program_header_size;
1513 /* Used by find_nearest_line entry point. */
1516 /* Used by MIPS ELF find_nearest_line entry point. The structure
1517 could be included directly in this one, but there's no point to
1518 wasting the memory just for the infrequently called
1519 find_nearest_line. */
1520 struct mips_elf_find_line *find_line_info;
1522 /* A place to stash dwarf1 info for this bfd. */
1523 struct dwarf1_debug *dwarf1_find_line_info;
1525 /* A place to stash dwarf2 info for this bfd. */
1526 void *dwarf2_find_line_info;
1528 /* An array of stub sections indexed by symbol number, used by the
1529 MIPS ELF linker. FIXME: We should figure out some way to only
1530 include this field for a MIPS ELF target. */
1531 asection **local_stubs;
1532 asection **local_call_stubs;
1534 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1536 asection *eh_frame_hdr;
1538 Elf_Internal_Shdr **group_sect_ptr;
1541 /* Number of symbol version definitions we are about to emit. */
1542 unsigned int cverdefs;
1544 /* Number of symbol version references we are about to emit. */
1545 unsigned int cverrefs;
1547 /* Segment flags for the PT_GNU_STACK segment. */
1548 unsigned int stack_flags;
1550 /* Symbol version definitions in external objects. */
1551 Elf_Internal_Verdef *verdef;
1553 /* Symbol version references to external objects. */
1554 Elf_Internal_Verneed *verref;
1556 /* The Irix 5 support uses two virtual sections, which represent
1557 text/data symbols defined in dynamic objects. */
1558 asymbol *elf_data_symbol;
1559 asymbol *elf_text_symbol;
1560 asection *elf_data_section;
1561 asection *elf_text_section;
1563 /* A pointer to the .eh_frame section. */
1564 asection *eh_frame_section;
1566 /* Whether a dyanmic object was specified normally on the linker
1567 command line, or was specified when --as-needed was in effect,
1568 or was found via a DT_NEEDED entry. */
1569 enum dynamic_lib_link_class dyn_lib_class;
1571 /* This is set to TRUE if the object was created by the backend
1575 /* Irix 5 often screws up the symbol table, sorting local symbols
1576 after global symbols. This flag is set if the symbol table in
1577 this BFD appears to be screwed up. If it is, we ignore the
1578 sh_info field in the symbol table header, and always read all the
1580 bfd_boolean bad_symtab;
1582 /* Used to determine if the e_flags field has been initialized */
1583 bfd_boolean flags_init;
1585 /* Symbol buffer. */
1588 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1589 obj_attribute_list *other_obj_attributes[2];
1591 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1592 bfd_boolean (*after_write_object_contents) (bfd *);
1593 void *after_write_object_contents_info;
1595 /* NT_GNU_BUILD_ID note type. */
1596 bfd_size_type build_id_size;
1599 /* An identifier used to distinguish different target
1600 specific extensions to this structure. */
1601 enum elf_object_id object_id;
1604 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1606 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1607 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> program_header_size)
1608 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1609 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1610 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1611 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1612 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1613 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1614 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1615 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1616 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1617 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1618 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1619 #define elf_eh_frame_section(bfd) \
1620 (elf_tdata(bfd) -> eh_frame_section)
1621 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1622 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1623 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1624 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1625 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1626 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1627 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1628 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1629 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1630 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1631 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1632 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1633 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1634 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1635 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1636 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1637 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1638 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1639 #define elf_known_obj_attributes_proc(bfd) \
1640 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1641 #define elf_other_obj_attributes_proc(bfd) \
1642 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1644 extern void _bfd_elf_swap_verdef_in
1645 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1646 extern void _bfd_elf_swap_verdef_out
1647 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1648 extern void _bfd_elf_swap_verdaux_in
1649 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1650 extern void _bfd_elf_swap_verdaux_out
1651 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1652 extern void _bfd_elf_swap_verneed_in
1653 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1654 extern void _bfd_elf_swap_verneed_out
1655 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1656 extern void _bfd_elf_swap_vernaux_in
1657 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1658 extern void _bfd_elf_swap_vernaux_out
1659 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1660 extern void _bfd_elf_swap_versym_in
1661 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1662 extern void _bfd_elf_swap_versym_out
1663 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1665 extern unsigned int _bfd_elf_section_from_bfd_section
1666 (bfd *, asection *);
1667 extern char *bfd_elf_string_from_elf_section
1668 (bfd *, unsigned, unsigned);
1669 extern char *bfd_elf_get_str_section
1671 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1672 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1673 Elf_External_Sym_Shndx *);
1674 extern const char *bfd_elf_sym_name
1675 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1677 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1679 extern bfd_boolean _bfd_elf_print_private_bfd_data
1681 extern void bfd_elf_print_symbol
1682 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1684 extern unsigned int _bfd_elf_eh_frame_address_size
1685 (bfd *, asection *);
1686 extern bfd_byte _bfd_elf_encode_eh_address
1687 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1688 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1689 extern bfd_boolean _bfd_elf_can_make_relative
1690 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1692 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1693 (const Elf_Internal_Rela *);
1694 extern bfd_vma _bfd_elf_rela_local_sym
1695 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1696 extern bfd_vma _bfd_elf_rel_local_sym
1697 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1698 extern bfd_vma _bfd_elf_section_offset
1699 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1701 extern unsigned long bfd_elf_hash
1703 extern unsigned long bfd_elf_gnu_hash
1706 extern bfd_reloc_status_type bfd_elf_generic_reloc
1707 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1708 extern bfd_boolean bfd_elf_allocate_object
1709 (bfd *, size_t, enum elf_object_id);
1710 extern bfd_boolean bfd_elf_make_generic_object
1712 extern bfd_boolean bfd_elf_mkcorefile
1714 extern Elf_Internal_Shdr *bfd_elf_find_section
1716 extern bfd_boolean _bfd_elf_make_section_from_shdr
1717 (bfd *, Elf_Internal_Shdr *, const char *, int);
1718 extern bfd_boolean _bfd_elf_make_section_from_phdr
1719 (bfd *, Elf_Internal_Phdr *, int, const char *);
1720 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1721 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1722 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1724 extern void _bfd_elf_link_hash_copy_indirect
1725 (struct bfd_link_info *, struct elf_link_hash_entry *,
1726 struct elf_link_hash_entry *);
1727 extern void _bfd_elf_link_hash_hide_symbol
1728 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1729 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1730 (struct bfd_link_info *, struct elf_link_hash_entry *);
1731 extern bfd_boolean _bfd_elf_link_hash_table_init
1732 (struct elf_link_hash_table *, bfd *,
1733 struct bfd_hash_entry *(*)
1734 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1736 extern bfd_boolean _bfd_elf_slurp_version_tables
1737 (bfd *, bfd_boolean);
1738 extern bfd_boolean _bfd_elf_merge_sections
1739 (bfd *, struct bfd_link_info *);
1740 extern bfd_boolean _bfd_elf_match_sections_by_type
1741 (bfd *, const asection *, bfd *, const asection *);
1742 extern bfd_boolean bfd_elf_is_group_section
1743 (bfd *, const struct bfd_section *);
1744 extern void _bfd_elf_section_already_linked
1745 (bfd *, struct bfd_section *, struct bfd_link_info *);
1746 extern void bfd_elf_set_group_contents
1747 (bfd *, asection *, void *);
1748 extern asection *_bfd_elf_check_kept_section
1749 (asection *, struct bfd_link_info *);
1750 extern void _bfd_elf_link_just_syms
1751 (asection *, struct bfd_link_info *);
1752 extern bfd_boolean _bfd_elf_copy_private_header_data
1754 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1755 (bfd *, asymbol *, bfd *, asymbol *);
1756 #define _bfd_generic_init_private_section_data \
1757 _bfd_elf_init_private_section_data
1758 extern bfd_boolean _bfd_elf_init_private_section_data
1759 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1760 extern bfd_boolean _bfd_elf_copy_private_section_data
1761 (bfd *, asection *, bfd *, asection *);
1762 extern bfd_boolean _bfd_elf_write_object_contents
1764 extern bfd_boolean _bfd_elf_write_corefile_contents
1766 extern bfd_boolean _bfd_elf_set_section_contents
1767 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1768 extern long _bfd_elf_get_symtab_upper_bound
1770 extern long _bfd_elf_canonicalize_symtab
1771 (bfd *, asymbol **);
1772 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1774 extern long _bfd_elf_canonicalize_dynamic_symtab
1775 (bfd *, asymbol **);
1776 extern long _bfd_elf_get_synthetic_symtab
1777 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1778 extern long _bfd_elf_get_reloc_upper_bound
1780 extern long _bfd_elf_canonicalize_reloc
1781 (bfd *, sec_ptr, arelent **, asymbol **);
1782 extern asection * _bfd_elf_get_dynamic_reloc_section
1783 (bfd *, asection *, bfd_boolean);
1784 extern asection * _bfd_elf_make_dynamic_reloc_section
1785 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1786 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1788 extern long _bfd_elf_canonicalize_dynamic_reloc
1789 (bfd *, arelent **, asymbol **);
1790 extern asymbol *_bfd_elf_make_empty_symbol
1792 extern void _bfd_elf_get_symbol_info
1793 (bfd *, asymbol *, symbol_info *);
1794 extern bfd_boolean _bfd_elf_is_local_label_name
1795 (bfd *, const char *);
1796 extern alent *_bfd_elf_get_lineno
1798 extern bfd_boolean _bfd_elf_set_arch_mach
1799 (bfd *, enum bfd_architecture, unsigned long);
1800 extern bfd_boolean _bfd_elf_find_nearest_line
1801 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1803 extern bfd_boolean _bfd_elf_find_line
1804 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1805 #define _bfd_generic_find_line _bfd_elf_find_line
1806 extern bfd_boolean _bfd_elf_find_inliner_info
1807 (bfd *, const char **, const char **, unsigned int *);
1808 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1809 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1810 extern int _bfd_elf_sizeof_headers
1811 (bfd *, struct bfd_link_info *);
1812 extern bfd_boolean _bfd_elf_new_section_hook
1813 (bfd *, asection *);
1814 extern bfd_boolean _bfd_elf_init_reloc_shdr
1815 (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean);
1816 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1817 (const char *, const struct bfd_elf_special_section *, unsigned int);
1818 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1819 (bfd *, asection *);
1821 /* If the target doesn't have reloc handling written yet: */
1822 extern void _bfd_elf_no_info_to_howto
1823 (bfd *, arelent *, Elf_Internal_Rela *);
1825 extern bfd_boolean bfd_section_from_shdr
1826 (bfd *, unsigned int shindex);
1827 extern bfd_boolean bfd_section_from_phdr
1828 (bfd *, Elf_Internal_Phdr *, int);
1830 extern int _bfd_elf_symbol_from_bfd_symbol
1831 (bfd *, asymbol **);
1833 extern asection *bfd_section_from_r_symndx
1834 (bfd *, struct sym_sec_cache *, asection *, unsigned long);
1835 extern asection *bfd_section_from_elf_index
1836 (bfd *, unsigned int);
1837 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1840 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1842 extern void _bfd_elf_strtab_free
1843 (struct elf_strtab_hash *);
1844 extern bfd_size_type _bfd_elf_strtab_add
1845 (struct elf_strtab_hash *, const char *, bfd_boolean);
1846 extern void _bfd_elf_strtab_addref
1847 (struct elf_strtab_hash *, bfd_size_type);
1848 extern void _bfd_elf_strtab_delref
1849 (struct elf_strtab_hash *, bfd_size_type);
1850 extern void _bfd_elf_strtab_clear_all_refs
1851 (struct elf_strtab_hash *);
1852 extern bfd_size_type _bfd_elf_strtab_size
1853 (struct elf_strtab_hash *);
1854 extern bfd_size_type _bfd_elf_strtab_offset
1855 (struct elf_strtab_hash *, bfd_size_type);
1856 extern bfd_boolean _bfd_elf_strtab_emit
1857 (bfd *, struct elf_strtab_hash *);
1858 extern void _bfd_elf_strtab_finalize
1859 (struct elf_strtab_hash *);
1861 extern void _bfd_elf_begin_eh_frame_parsing
1862 (struct bfd_link_info *info);
1863 extern void _bfd_elf_parse_eh_frame
1864 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1865 extern void _bfd_elf_end_eh_frame_parsing
1866 (struct bfd_link_info *info);
1868 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1869 (bfd *, struct bfd_link_info *, asection *,
1870 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1871 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1872 (bfd *, struct bfd_link_info *);
1873 extern bfd_vma _bfd_elf_eh_frame_section_offset
1874 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1875 extern bfd_boolean _bfd_elf_write_section_eh_frame
1876 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1877 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1878 (bfd *, struct bfd_link_info *);
1879 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1880 (struct bfd_link_info *);
1882 extern bfd_boolean _bfd_elf_merge_symbol
1883 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1884 asection **, bfd_vma *, unsigned int *,
1885 struct elf_link_hash_entry **, bfd_boolean *,
1886 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1888 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1890 extern bfd_boolean _bfd_elf_add_default_symbol
1891 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
1892 const char *, Elf_Internal_Sym *, asection **, bfd_vma *,
1893 bfd_boolean *, bfd_boolean);
1895 extern bfd_boolean _bfd_elf_export_symbol
1896 (struct elf_link_hash_entry *, void *);
1898 extern bfd_boolean _bfd_elf_link_find_version_dependencies
1899 (struct elf_link_hash_entry *, void *);
1901 extern bfd_boolean _bfd_elf_link_assign_sym_version
1902 (struct elf_link_hash_entry *, void *);
1904 extern long _bfd_elf_link_lookup_local_dynindx
1905 (struct bfd_link_info *, bfd *, long);
1906 extern bfd_boolean _bfd_elf_compute_section_file_positions
1907 (bfd *, struct bfd_link_info *);
1908 extern void _bfd_elf_assign_file_positions_for_relocs
1910 extern file_ptr _bfd_elf_assign_file_position_for_section
1911 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1913 extern bfd_boolean _bfd_elf_validate_reloc
1916 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1917 (bfd *, struct bfd_link_info *);
1918 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1919 (bfd *, struct bfd_link_info *, asection *);
1920 extern bfd_boolean _bfd_elf_create_dynamic_sections
1921 (bfd *, struct bfd_link_info *);
1922 extern bfd_boolean _bfd_elf_create_got_section
1923 (bfd *, struct bfd_link_info *);
1924 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1925 (bfd *, struct bfd_link_info *, asection *, const char *);
1926 extern void _bfd_elf_init_1_index_section
1927 (bfd *, struct bfd_link_info *);
1928 extern void _bfd_elf_init_2_index_sections
1929 (bfd *, struct bfd_link_info *);
1931 extern bfd_boolean _bfd_elfcore_make_pseudosection
1932 (bfd *, char *, size_t, ufile_ptr);
1933 extern char *_bfd_elfcore_strndup
1934 (bfd *, char *, size_t);
1936 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1937 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1939 extern bfd_boolean _bfd_elf_link_size_reloc_section
1940 (bfd *, Elf_Internal_Shdr *, asection *);
1942 extern bfd_boolean _bfd_elf_link_output_relocs
1943 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1944 struct elf_link_hash_entry **);
1946 extern bfd_boolean _bfd_elf_fix_symbol_flags
1947 (struct elf_link_hash_entry *, struct elf_info_failed *);
1949 extern bfd_boolean _bfd_elf_adjust_dynamic_symbol
1950 (struct elf_link_hash_entry *, void *);
1952 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
1953 (struct elf_link_hash_entry *, asection *);
1955 extern bfd_boolean _bfd_elf_link_sec_merge_syms
1956 (struct elf_link_hash_entry *, void *);
1958 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1959 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1961 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1962 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1964 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
1965 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
1967 extern bfd_boolean _bfd_elf_setup_sections
1970 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
1972 extern const bfd_target *bfd_elf32_object_p
1974 extern const bfd_target *bfd_elf32_core_file_p
1976 extern char *bfd_elf32_core_file_failing_command
1978 extern int bfd_elf32_core_file_failing_signal
1980 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1983 extern bfd_boolean bfd_elf32_swap_symbol_in
1984 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1985 extern void bfd_elf32_swap_symbol_out
1986 (bfd *, const Elf_Internal_Sym *, void *, void *);
1987 extern void bfd_elf32_swap_reloc_in
1988 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1989 extern void bfd_elf32_swap_reloc_out
1990 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1991 extern void bfd_elf32_swap_reloca_in
1992 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1993 extern void bfd_elf32_swap_reloca_out
1994 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1995 extern void bfd_elf32_swap_phdr_in
1996 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
1997 extern void bfd_elf32_swap_phdr_out
1998 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
1999 extern void bfd_elf32_swap_dyn_in
2000 (bfd *, const void *, Elf_Internal_Dyn *);
2001 extern void bfd_elf32_swap_dyn_out
2002 (bfd *, const Elf_Internal_Dyn *, void *);
2003 extern long bfd_elf32_slurp_symbol_table
2004 (bfd *, asymbol **, bfd_boolean);
2005 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2007 extern int bfd_elf32_write_out_phdrs
2008 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2009 extern bfd_boolean bfd_elf32_checksum_contents
2010 (bfd * , void (*) (const void *, size_t, void *), void *);
2011 extern void bfd_elf32_write_relocs
2012 (bfd *, asection *, void *);
2013 extern bfd_boolean bfd_elf32_slurp_reloc_table
2014 (bfd *, asection *, asymbol **, bfd_boolean);
2016 extern const bfd_target *bfd_elf64_object_p
2018 extern const bfd_target *bfd_elf64_core_file_p
2020 extern char *bfd_elf64_core_file_failing_command
2022 extern int bfd_elf64_core_file_failing_signal
2024 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2027 extern bfd_boolean bfd_elf64_swap_symbol_in
2028 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2029 extern void bfd_elf64_swap_symbol_out
2030 (bfd *, const Elf_Internal_Sym *, void *, void *);
2031 extern void bfd_elf64_swap_reloc_in
2032 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2033 extern void bfd_elf64_swap_reloc_out
2034 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2035 extern void bfd_elf64_swap_reloca_in
2036 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2037 extern void bfd_elf64_swap_reloca_out
2038 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2039 extern void bfd_elf64_swap_phdr_in
2040 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2041 extern void bfd_elf64_swap_phdr_out
2042 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2043 extern void bfd_elf64_swap_dyn_in
2044 (bfd *, const void *, Elf_Internal_Dyn *);
2045 extern void bfd_elf64_swap_dyn_out
2046 (bfd *, const Elf_Internal_Dyn *, void *);
2047 extern long bfd_elf64_slurp_symbol_table
2048 (bfd *, asymbol **, bfd_boolean);
2049 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2051 extern int bfd_elf64_write_out_phdrs
2052 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2053 extern bfd_boolean bfd_elf64_checksum_contents
2054 (bfd * , void (*) (const void *, size_t, void *), void *);
2055 extern void bfd_elf64_write_relocs
2056 (bfd *, asection *, void *);
2057 extern bfd_boolean bfd_elf64_slurp_reloc_table
2058 (bfd *, asection *, asymbol **, bfd_boolean);
2060 extern bfd_boolean _bfd_elf_default_relocs_compatible
2061 (const bfd_target *, const bfd_target *);
2063 extern bfd_boolean _bfd_elf_relocs_compatible
2064 (const bfd_target *, const bfd_target *);
2066 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2067 (bfd *, struct bfd_link_info *, const char *);
2068 extern bfd_boolean bfd_elf_link_add_symbols
2069 (bfd *, struct bfd_link_info *);
2070 extern bfd_boolean _bfd_elf_add_dynamic_entry
2071 (struct bfd_link_info *, bfd_vma, bfd_vma);
2073 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2074 (struct bfd_link_info *, struct elf_link_hash_entry *);
2076 extern int bfd_elf_link_record_local_dynamic_symbol
2077 (struct bfd_link_info *, bfd *, long);
2079 extern void bfd_elf_link_mark_dynamic_symbol
2080 (struct bfd_link_info *, struct elf_link_hash_entry *,
2081 Elf_Internal_Sym *);
2083 extern bfd_boolean _bfd_elf_close_and_cleanup
2086 extern bfd_boolean _bfd_elf_common_definition
2087 (Elf_Internal_Sym *);
2089 extern unsigned int _bfd_elf_common_section_index
2092 extern asection *_bfd_elf_common_section
2095 extern void _bfd_dwarf2_cleanup_debug_info
2098 extern bfd_vma _bfd_elf_default_got_elt_size
2099 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2102 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2103 (bfd *, arelent *, struct bfd_symbol *, void *,
2104 asection *, bfd *, char **);
2106 extern bfd_boolean bfd_elf_final_link
2107 (bfd *, struct bfd_link_info *);
2109 extern void _bfd_elf_gc_keep
2110 (struct bfd_link_info *info);
2112 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2113 (struct elf_link_hash_entry *h, void *inf);
2115 extern bfd_boolean bfd_elf_gc_sections
2116 (bfd *, struct bfd_link_info *);
2118 extern bfd_boolean bfd_elf_gc_record_vtinherit
2119 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2121 extern bfd_boolean bfd_elf_gc_record_vtentry
2122 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2124 extern asection *_bfd_elf_gc_mark_hook
2125 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2126 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2128 extern asection *_bfd_elf_gc_mark_rsec
2129 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2130 struct elf_reloc_cookie *);
2132 extern bfd_boolean _bfd_elf_gc_mark_reloc
2133 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2134 struct elf_reloc_cookie *);
2136 extern bfd_boolean _bfd_elf_gc_mark_fdes
2137 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2138 struct elf_reloc_cookie *);
2140 extern bfd_boolean _bfd_elf_gc_mark
2141 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2143 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2144 (bfd *, struct bfd_link_info *);
2146 extern bfd_boolean bfd_elf_gc_common_final_link
2147 (bfd *, struct bfd_link_info *);
2149 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2152 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2153 (bfd *, asection *);
2155 extern bfd_boolean _bfd_elf_map_sections_to_segments
2156 (bfd *, struct bfd_link_info *);
2158 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2160 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2161 (bfd * abfd, asection * section);
2163 /* Exported interface for writing elf corefile notes. */
2164 extern char *elfcore_write_note
2165 (bfd *, char *, int *, const char *, int, const void *, int);
2166 extern char *elfcore_write_prpsinfo
2167 (bfd *, char *, int *, const char *, const char *);
2168 extern char *elfcore_write_prstatus
2169 (bfd *, char *, int *, long, int, const void *);
2170 extern char * elfcore_write_pstatus
2171 (bfd *, char *, int *, long, int, const void *);
2172 extern char *elfcore_write_prfpreg
2173 (bfd *, char *, int *, const void *, int);
2174 extern char *elfcore_write_prxfpreg
2175 (bfd *, char *, int *, const void *, int);
2176 extern char *elfcore_write_ppc_vmx
2177 (bfd *, char *, int *, const void *, int);
2178 extern char *elfcore_write_ppc_vsx
2179 (bfd *, char *, int *, const void *, int);
2180 extern char *elfcore_write_lwpstatus
2181 (bfd *, char *, int *, long, int, const void *);
2182 extern char *elfcore_write_register_note
2183 (bfd *, char *, int *, const char *, const void *, int);
2185 extern bfd *_bfd_elf32_bfd_from_remote_memory
2186 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2187 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2188 extern bfd *_bfd_elf64_bfd_from_remote_memory
2189 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2190 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2192 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2193 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2194 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2195 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2196 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2197 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2198 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2199 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2200 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2201 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2203 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2204 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2207 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2208 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2209 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2210 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2211 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2213 /* Large common section. */
2214 extern asection _bfd_elf_large_com_section;
2216 /* SH ELF specific routine. */
2218 extern bfd_boolean _sh_elf_set_mach_from_flags
2221 /* This is the condition under which finish_dynamic_symbol will be called.
2222 If our finish_dynamic_symbol isn't called, we'll need to do something
2223 about initializing any .plt and .got entries in relocate_section. */
2224 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2226 && ((SHARED) || !(H)->forced_local) \
2227 && ((H)->dynindx != -1 || (H)->forced_local))
2229 /* This macro is to avoid lots of duplicated code in the body
2230 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2231 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2232 r_symndx, symtab_hdr, sym_hashes, \
2233 h, sec, relocation, \
2234 unresolved_reloc, warned) \
2237 /* It seems this can happen with erroneous or unsupported \
2238 input (mixing a.out and elf in an archive, for example.) */ \
2239 if (sym_hashes == NULL) \
2242 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2244 while (h->root.type == bfd_link_hash_indirect \
2245 || h->root.type == bfd_link_hash_warning) \
2246 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2249 unresolved_reloc = FALSE; \
2251 if (h->root.type == bfd_link_hash_defined \
2252 || h->root.type == bfd_link_hash_defweak) \
2254 sec = h->root.u.def.section; \
2256 || sec->output_section == NULL) \
2257 /* Set a flag that will be cleared later if we find a \
2258 relocation value for this symbol. output_section \
2259 is typically NULL for symbols satisfied by a shared \
2261 unresolved_reloc = TRUE; \
2263 relocation = (h->root.u.def.value \
2264 + sec->output_section->vma \
2265 + sec->output_offset); \
2267 else if (h->root.type == bfd_link_hash_undefweak) \
2269 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2270 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2272 else if (!info->relocatable) \
2275 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2276 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2277 if (!info->callbacks->undefined_symbol (info, \
2278 h->root.root.string, \
2281 rel->r_offset, err)) \
2288 /* Will a symbol be bound to the the definition within the shared
2290 #define SYMBOLIC_BIND(INFO, H) \
2291 ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))
2293 #endif /* _LIBELF_H_ */