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, 2010
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;
90 bfd_signed_vma refcount;
92 struct got_entry *glist;
93 struct plt_entry *plist;
96 struct elf_link_virtual_table_entry
98 /* Virtual table entry use information. This array is nominally of size
99 size/sizeof(target_void_pointer), though we have to be able to assume
100 and track a size while the symbol is still undefined. It is indexed
101 via offset/sizeof(target_void_pointer). */
105 /* Virtual table derivation info. */
106 struct elf_link_hash_entry *parent;
109 /* ELF linker hash table entries. */
111 struct elf_link_hash_entry
113 struct bfd_link_hash_entry root;
115 /* Symbol index in output file. This is initialized to -1. It is
116 set to -2 if the symbol is used by a reloc. */
119 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
120 -1 if this is not a dynamic symbol. */
121 /* ??? Note that this is consistently used as a synonym for tests
122 against whether we can perform various simplifying transformations
123 to the code. (E.g. changing a pc-relative jump to a PLT entry
124 into a pc-relative jump to the target function.) That test, which
125 is often relatively complex, and someplaces wrong or incomplete,
126 should really be replaced by a predicate in elflink.c.
128 End result: this field -1 does not indicate that the symbol is
129 not in the dynamic symbol table, but rather that the symbol is
130 not visible outside this DSO. */
133 /* If this symbol requires an entry in the global offset table, the
134 processor specific backend uses this field to track usage and
135 final offset. Two schemes are supported: The first assumes that
136 a symbol may only have one GOT entry, and uses REFCOUNT until
137 size_dynamic_sections, at which point the contents of the .got is
138 fixed. Afterward, if OFFSET is -1, then the symbol does not
139 require a global offset table entry. The second scheme allows
140 multiple GOT entries per symbol, managed via a linked list
141 pointed to by GLIST. */
142 union gotplt_union got;
144 /* Same, but tracks a procedure linkage table entry. */
145 union gotplt_union plt;
150 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
151 unsigned int type : 8;
153 /* Symbol st_other value, symbol visibility. */
154 unsigned int other : 8;
156 /* Symbol is referenced by a non-shared object (other than the object
157 in which it is defined). */
158 unsigned int ref_regular : 1;
159 /* Symbol is defined by a non-shared object. */
160 unsigned int def_regular : 1;
161 /* Symbol is referenced by a shared object. */
162 unsigned int ref_dynamic : 1;
163 /* Symbol is defined by a shared object. */
164 unsigned int def_dynamic : 1;
165 /* Symbol has a non-weak reference from a non-shared object (other than
166 the object in which it is defined). */
167 unsigned int ref_regular_nonweak : 1;
168 /* Dynamic symbol has been adjustd. */
169 unsigned int dynamic_adjusted : 1;
170 /* Symbol needs a copy reloc. */
171 unsigned int needs_copy : 1;
172 /* Symbol needs a procedure linkage table entry. */
173 unsigned int needs_plt : 1;
174 /* Symbol appears in a non-ELF input file. */
175 unsigned int non_elf : 1;
176 /* Symbol should be marked as hidden in the version information. */
177 unsigned int hidden : 1;
178 /* Symbol was forced to local scope due to a version script file. */
179 unsigned int forced_local : 1;
180 /* Symbol was forced to be dynamic due to a version script file. */
181 unsigned int dynamic : 1;
182 /* Symbol was marked during garbage collection. */
183 unsigned int mark : 1;
184 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
185 not currently set by all the backends. */
186 unsigned int non_got_ref : 1;
187 /* Symbol has a definition in a shared object.
188 FIXME: There is no real need for this field if def_dynamic is never
189 cleared and all places that test def_dynamic also test def_regular. */
190 unsigned int dynamic_def : 1;
191 /* Symbol is weak in all shared objects. */
192 unsigned int dynamic_weak : 1;
193 /* Symbol is referenced with a relocation where C/C++ pointer equality
195 unsigned int pointer_equality_needed : 1;
196 /* Symbol is a unique global symbol. */
197 unsigned int unique_global : 1;
199 /* String table index in .dynstr if this is a dynamic symbol. */
200 unsigned long dynstr_index;
204 /* If this is a weak defined symbol from a dynamic object, this
205 field points to a defined symbol with the same value, if there is
206 one. Otherwise it is NULL. */
207 struct elf_link_hash_entry *weakdef;
209 /* Hash value of the name computed using the ELF hash function.
210 Used part way through size_dynamic_sections, after we've finished
212 unsigned long elf_hash_value;
215 /* Version information. */
218 /* This field is used for a symbol which is not defined in a
219 regular object. It points to the version information read in
220 from the dynamic object. */
221 Elf_Internal_Verdef *verdef;
222 /* This field is used for a symbol which is defined in a regular
223 object. It is set up in size_dynamic_sections. It points to
224 the version information we should write out for this symbol. */
225 struct bfd_elf_version_tree *vertree;
228 struct elf_link_virtual_table_entry *vtable;
231 /* Will references to this symbol always reference the symbol
232 in this object? STV_PROTECTED is excluded from the visibility test
233 here so that function pointer comparisons work properly. Since
234 function symbols not defined in an app are set to their .plt entry,
235 it's necessary for shared libs to also reference the .plt even
236 though the symbol is really local to the shared lib. */
237 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
238 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
240 /* Will _calls_ to this symbol always call the version in this object? */
241 #define SYMBOL_CALLS_LOCAL(INFO, H) \
242 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
244 /* Common symbols that are turned into definitions don't have the
245 DEF_REGULAR flag set, so they might appear to be undefined. */
246 #define ELF_COMMON_DEF_P(H) \
248 && !(H)->def_dynamic \
249 && (H)->root.type == bfd_link_hash_defined)
251 /* Records local symbols to be emitted in the dynamic symbol table. */
253 struct elf_link_local_dynamic_entry
255 struct elf_link_local_dynamic_entry *next;
257 /* The input bfd this symbol came from. */
260 /* The index of the local symbol being copied. */
263 /* The index in the outgoing dynamic symbol table. */
266 /* A copy of the input symbol. */
267 Elf_Internal_Sym isym;
270 struct elf_link_loaded_list
272 struct elf_link_loaded_list *next;
276 /* Structures used by the eh_frame optimization code. */
281 /* If REMOVED == 1, this is the CIE that the FDE originally used.
282 The CIE belongs to the same .eh_frame input section as the FDE.
284 If REMOVED == 0, this is the CIE that we have chosen to use for
285 the output FDE. The CIE's REMOVED field is also 0, but the CIE
286 might belong to a different .eh_frame input section from the FDE. */
287 struct eh_cie_fde *cie_inf;
288 struct eh_cie_fde *next_for_section;
291 /* CIEs have three states:
293 - REMOVED && !MERGED: Slated for removal because we haven't yet
294 proven that an FDE needs it. FULL_CIE, if nonnull, points to
295 more detailed information about the CIE.
297 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
298 which may not belong to the same input section.
300 - !REMOVED: We have decided to keep this CIE. SEC is the
301 .eh_frame input section that contains the CIE. */
303 struct cie *full_cie;
304 struct eh_cie_fde *merged_with;
308 /* The offset of the personality data from the start of the CIE,
309 or 0 if the CIE doesn't have any. */
310 unsigned int personality_offset : 8;
312 /* True if we have marked relocations associated with this CIE. */
313 unsigned int gc_mark : 1;
315 /* True if we have decided to turn an absolute LSDA encoding into
316 a PC-relative one. */
317 unsigned int make_lsda_relative : 1;
319 /* True if we have decided to turn an absolute personality
320 encoding into a PC-relative one. */
321 unsigned int make_per_encoding_relative : 1;
323 /* True if the CIE contains personality data and if that
324 data uses a PC-relative encoding. Always true when
325 make_per_encoding_relative is. */
326 unsigned int per_encoding_relative : 1;
328 /* True if we need to add an 'R' (FDE encoding) entry to the
329 CIE's augmentation data. */
330 unsigned int add_fde_encoding : 1;
332 /* True if we have merged this CIE with another. */
333 unsigned int merged : 1;
336 unsigned int pad1 : 18;
339 unsigned int reloc_index;
342 unsigned int new_offset;
343 unsigned int fde_encoding : 8;
344 unsigned int lsda_encoding : 8;
345 unsigned int lsda_offset : 8;
347 /* True if this entry represents a CIE, false if it represents an FDE. */
348 unsigned int cie : 1;
350 /* True if this entry is currently marked for removal. */
351 unsigned int removed : 1;
353 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
354 augmentation data, and an associated byte to each of the CIE's FDEs. */
355 unsigned int add_augmentation_size : 1;
357 /* True if we have decided to convert absolute FDE relocations into
358 relative ones. This applies to the first relocation in the FDE,
359 which is against the code that the FDE describes. */
360 unsigned int make_relative : 1;
363 unsigned int pad1 : 4;
365 unsigned int *set_loc;
368 struct eh_frame_sec_info
372 struct eh_cie_fde entry[1];
375 struct eh_frame_array_ent
383 struct eh_frame_hdr_info
387 unsigned int fde_count, array_count;
388 struct eh_frame_array_ent *array;
389 /* TRUE if we should try to merge CIEs between input sections. */
390 bfd_boolean merge_cies;
391 /* TRUE if all .eh_frames have been parsd. */
392 bfd_boolean parsed_eh_frames;
393 /* TRUE if .eh_frame_hdr should contain the sorted search table.
394 We build it if we successfully read all .eh_frame input sections
395 and recognize them. */
399 /* Enum used to identify target specific extensions to the elf_obj_tdata
400 and elf_link_hash_table structures. Note the enums deliberately start
401 from 1 so that we can detect an uninitialized field. The generic value
402 is last so that additions to this enum do not need to modify more than
435 /* ELF linker hash table. */
437 struct elf_link_hash_table
439 struct bfd_link_hash_table root;
441 /* An identifier used to distinguish different target
442 specific extensions to this structure. */
443 enum elf_target_id hash_table_id;
445 /* Whether we have created the special dynamic sections required
446 when linking against or generating a shared object. */
447 bfd_boolean dynamic_sections_created;
449 /* True if this target has relocatable executables, so needs dynamic
451 bfd_boolean is_relocatable_executable;
453 /* The BFD used to hold special sections created by the linker.
454 This will be the first BFD found which requires these sections to
458 /* The value to use when initialising got.refcount/offset and
459 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
460 the values are refcounts. Set to init_got_offset/init_plt_offset
461 in size_dynamic_sections when the values may be offsets. */
462 union gotplt_union init_got_refcount;
463 union gotplt_union init_plt_refcount;
465 /* The value to use for got.refcount/offset and plt.refcount/offset
466 when the values may be offsets. Normally (bfd_vma) -1. */
467 union gotplt_union init_got_offset;
468 union gotplt_union init_plt_offset;
470 /* The number of symbols found in the link which must be put into
471 the .dynsym section. */
472 bfd_size_type dynsymcount;
474 /* The string table of dynamic symbols, which becomes the .dynstr
476 struct elf_strtab_hash *dynstr;
478 /* The number of buckets in the hash table in the .hash section.
479 This is based on the number of dynamic symbols. */
480 bfd_size_type bucketcount;
482 /* A linked list of DT_NEEDED names found in dynamic objects
483 included in the link. */
484 struct bfd_link_needed_list *needed;
486 /* Sections in the output bfd that provides a section symbol
487 to be used by relocations emitted against local symbols.
488 Most targets will not use data_index_section. */
489 asection *text_index_section;
490 asection *data_index_section;
492 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
493 struct elf_link_hash_entry *hgot;
495 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
496 struct elf_link_hash_entry *hplt;
498 /* A pointer to information used to merge SEC_MERGE sections. */
501 /* Used to link stabs in sections. */
502 struct stab_info stab_info;
504 /* Used by eh_frame code when editing .eh_frame. */
505 struct eh_frame_hdr_info eh_info;
507 /* A linked list of local symbols to be added to .dynsym. */
508 struct elf_link_local_dynamic_entry *dynlocal;
510 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
511 objects included in the link. */
512 struct bfd_link_needed_list *runpath;
514 /* Cached first output tls section and size of PT_TLS segment. */
516 bfd_size_type tls_size;
518 /* A linked list of BFD's loaded in the link. */
519 struct elf_link_loaded_list *loaded;
521 /* Short-cuts to get to dynamic linker sections. */
533 /* Look up an entry in an ELF linker hash table. */
535 #define elf_link_hash_lookup(table, string, create, copy, follow) \
536 ((struct elf_link_hash_entry *) \
537 bfd_link_hash_lookup (&(table)->root, (string), (create), \
540 /* Traverse an ELF linker hash table. */
542 #define elf_link_hash_traverse(table, func, info) \
543 (bfd_link_hash_traverse \
545 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
548 /* Get the ELF linker hash table from a link_info structure. */
550 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
552 #define elf_hash_table_id(table) ((table) -> hash_table_id)
554 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
555 #define is_elf_hash_table(htab) \
556 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
558 /* Used by bfd_sym_from_r_symndx to cache a small number of local
560 #define LOCAL_SYM_CACHE_SIZE 32
564 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
565 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
568 /* Constant information held for an ELF backend. */
570 struct elf_size_info {
571 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
572 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
574 /* The size of entries in the .hash section. */
575 unsigned char sizeof_hash_entry;
577 /* The number of internal relocations to allocate per external
579 unsigned char int_rels_per_ext_rel;
580 /* We use some fixed size arrays. This should be large enough to
581 handle all back-ends. */
582 #define MAX_INT_RELS_PER_EXT_REL 3
584 unsigned char arch_size, log_file_align;
585 unsigned char elfclass, ev_current;
586 int (*write_out_phdrs)
587 (bfd *, const Elf_Internal_Phdr *, unsigned int);
589 (*write_shdrs_and_ehdr) (bfd *);
590 bfd_boolean (*checksum_contents)
591 (bfd * , void (*) (const void *, size_t, void *), void *);
593 (bfd *, asection *, void *);
594 bfd_boolean (*swap_symbol_in)
595 (bfd *, const void *, const void *, Elf_Internal_Sym *);
596 void (*swap_symbol_out)
597 (bfd *, const Elf_Internal_Sym *, void *, void *);
598 bfd_boolean (*slurp_reloc_table)
599 (bfd *, asection *, asymbol **, bfd_boolean);
600 long (*slurp_symbol_table)
601 (bfd *, asymbol **, bfd_boolean);
603 (bfd *, const void *, Elf_Internal_Dyn *);
605 (bfd *, const Elf_Internal_Dyn *, void *);
607 /* This function is called to swap in a REL relocation. If an
608 external relocation corresponds to more than one internal
609 relocation, then all relocations are swapped in at once. */
610 void (*swap_reloc_in)
611 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
613 /* This function is called to swap out a REL relocation. */
614 void (*swap_reloc_out)
615 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
617 /* This function is called to swap in a RELA relocation. If an
618 external relocation corresponds to more than one internal
619 relocation, then all relocations are swapped in at once. */
620 void (*swap_reloca_in)
621 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
623 /* This function is called to swap out a RELA relocation. */
624 void (*swap_reloca_out)
625 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
628 #define elf_symbol_from(ABFD,S) \
629 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
630 && (S)->the_bfd->tdata.elf_obj_data != 0) \
631 ? (elf_symbol_type *) (S) \
634 enum elf_reloc_type_class {
636 reloc_class_relative,
641 struct elf_reloc_cookie
643 Elf_Internal_Rela *rels, *rel, *relend;
644 Elf_Internal_Sym *locsyms;
648 struct elf_link_hash_entry **sym_hashes;
650 bfd_boolean bad_symtab;
653 /* The level of IRIX compatibility we're striving for. */
661 /* Mapping of ELF section names and types. */
662 struct bfd_elf_special_section
666 /* 0 means name must match PREFIX exactly.
667 -1 means name must start with PREFIX followed by an arbitrary string.
668 -2 means name must match PREFIX exactly or consist of PREFIX followed
669 by a dot then anything.
670 > 0 means name must start with the first PREFIX_LENGTH chars of
671 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
677 enum action_discarded
683 typedef asection * (*elf_gc_mark_hook_fn)
684 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
685 struct elf_link_hash_entry *, Elf_Internal_Sym *);
687 struct elf_backend_data
689 /* The architecture for this backend. */
690 enum bfd_architecture arch;
692 /* An identifier used to distinguish different target specific
693 extensions to elf_obj_tdata and elf_link_hash_table structures. */
694 enum elf_target_id target_id;
696 /* The ELF machine code (EM_xxxx) for this backend. */
697 int elf_machine_code;
702 /* The maximum page size for this backend. */
705 /* The minimum page size for this backend. An input object will not be
706 considered page aligned unless its sections are correctly aligned for
707 pages at least this large. May be smaller than maxpagesize. */
710 /* The common page size for this backend. */
711 bfd_vma commonpagesize;
713 /* The BFD flags applied to sections created for dynamic linking. */
714 flagword dynamic_sec_flags;
716 /* A function to translate an ELF RELA relocation to a BFD arelent
718 void (*elf_info_to_howto)
719 (bfd *, arelent *, Elf_Internal_Rela *);
721 /* A function to translate an ELF REL relocation to a BFD arelent
723 void (*elf_info_to_howto_rel)
724 (bfd *, arelent *, Elf_Internal_Rela *);
726 /* A function to determine whether a symbol is global when
727 partitioning the symbol table into local and global symbols.
728 This should be NULL for most targets, in which case the correct
729 thing will be done. MIPS ELF, at least on the Irix 5, has
730 special requirements. */
731 bfd_boolean (*elf_backend_sym_is_global)
734 /* The remaining functions are hooks which are called only if they
737 /* A function to permit a backend specific check on whether a
738 particular BFD format is relevant for an object file, and to
739 permit the backend to set any global information it wishes. When
740 this is called elf_elfheader is set, but anything else should be
741 used with caution. If this returns FALSE, the check_format
742 routine will return a bfd_error_wrong_format error. */
743 bfd_boolean (*elf_backend_object_p)
746 /* A function to do additional symbol processing when reading the
747 ELF symbol table. This is where any processor-specific special
748 section indices are handled. */
749 void (*elf_backend_symbol_processing)
752 /* A function to do additional symbol processing after reading the
753 entire ELF symbol table. */
754 bfd_boolean (*elf_backend_symbol_table_processing)
755 (bfd *, elf_symbol_type *, unsigned int);
757 /* A function to set the type of the info field. Processor-specific
758 types should be handled here. */
759 int (*elf_backend_get_symbol_type)
760 (Elf_Internal_Sym *, int);
762 /* A function to return the linker hash table entry of a symbol that
763 might be satisfied by an archive symbol. */
764 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
765 (bfd *, struct bfd_link_info *, const char *);
767 /* Return true if local section symbols should have a non-null st_name.
768 NULL implies false. */
769 bfd_boolean (*elf_backend_name_local_section_symbols)
772 /* A function to do additional processing on the ELF section header
773 just before writing it out. This is used to set the flags and
774 type fields for some sections, or to actually write out data for
776 bfd_boolean (*elf_backend_section_processing)
777 (bfd *, Elf_Internal_Shdr *);
779 /* A function to handle unusual section types when creating BFD
780 sections from ELF sections. */
781 bfd_boolean (*elf_backend_section_from_shdr)
782 (bfd *, Elf_Internal_Shdr *, const char *, int);
784 /* A function to convert machine dependent ELF section header flags to
785 BFD internal section header flags. */
786 bfd_boolean (*elf_backend_section_flags)
787 (flagword *, const Elf_Internal_Shdr *);
789 /* A function that returns a struct containing ELF section flags and
790 type for the given BFD section. */
791 const struct bfd_elf_special_section * (*get_sec_type_attr)
794 /* A function to handle unusual program segment types when creating BFD
795 sections from ELF program segments. */
796 bfd_boolean (*elf_backend_section_from_phdr)
797 (bfd *, Elf_Internal_Phdr *, int, const char *);
799 /* A function to set up the ELF section header for a BFD section in
800 preparation for writing it out. This is where the flags and type
801 fields are set for unusual sections. */
802 bfd_boolean (*elf_backend_fake_sections)
803 (bfd *, Elf_Internal_Shdr *, asection *);
805 /* A function to get the ELF section index for a BFD section. If
806 this returns TRUE, the section was found. If it is a normal ELF
807 section, *RETVAL should be left unchanged. If it is not a normal
808 ELF section *RETVAL should be set to the SHN_xxxx index. */
809 bfd_boolean (*elf_backend_section_from_bfd_section)
810 (bfd *, asection *, int *retval);
812 /* If this field is not NULL, it is called by the add_symbols phase
813 of a link just before adding a symbol to the global linker hash
814 table. It may modify any of the fields as it wishes. If *NAME
815 is set to NULL, the symbol will be skipped rather than being
816 added to the hash table. This function is responsible for
817 handling all processor dependent symbol bindings and section
818 indices, and must set at least *FLAGS and *SEC for each processor
819 dependent case; failure to do so will cause a link error. */
820 bfd_boolean (*elf_add_symbol_hook)
821 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
822 const char **name, flagword *flags, asection **sec, bfd_vma *value);
824 /* If this field is not NULL, it is called by the elf_link_output_sym
825 phase of a link for each symbol which will appear in the object file.
826 On error, this function returns 0. 1 is returned when the symbol
827 should be output, 2 is returned when the symbol should be discarded. */
828 int (*elf_backend_link_output_symbol_hook)
829 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
830 asection *, struct elf_link_hash_entry *);
832 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
833 linker the first time it encounters a dynamic object in the link.
834 This function must create any sections required for dynamic
835 linking. The ABFD argument is a dynamic object. The .interp,
836 .dynamic, .dynsym, .dynstr, and .hash functions have already been
837 created, and this function may modify the section flags if
838 desired. This function will normally create the .got and .plt
839 sections, but different backends have different requirements. */
840 bfd_boolean (*elf_backend_create_dynamic_sections)
841 (bfd *abfd, struct bfd_link_info *info);
843 /* When creating a shared library, determine whether to omit the
844 dynamic symbol for the section. */
845 bfd_boolean (*elf_backend_omit_section_dynsym)
846 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
848 /* Return TRUE if relocations of targets are compatible to the extent
849 that CHECK_RELOCS will properly process them. PR 4424. */
850 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
852 /* The CHECK_RELOCS function is called by the add_symbols phase of
853 the ELF backend linker. It is called once for each section with
854 relocs of an object file, just after the symbols for the object
855 file have been added to the global linker hash table. The
856 function must look through the relocs and do any special handling
857 required. This generally means allocating space in the global
858 offset table, and perhaps allocating space for a reloc. The
859 relocs are always passed as Rela structures; if the section
860 actually uses Rel structures, the r_addend field will always be
862 bfd_boolean (*check_relocs)
863 (bfd *abfd, struct bfd_link_info *info, asection *o,
864 const Elf_Internal_Rela *relocs);
866 /* The CHECK_DIRECTIVES function is called once per input file by
867 the add_symbols phase of the ELF backend linker. The function
868 must inspect the bfd and create any additional symbols according
869 to any custom directives in the bfd. */
870 bfd_boolean (*check_directives)
871 (bfd *abfd, struct bfd_link_info *info);
873 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
874 input file that was not needed by the add_symbols phase of the
875 ELF backend linker. The function must undo any target specific
876 changes in the symbol hash table. */
877 bfd_boolean (*as_needed_cleanup)
878 (bfd *abfd, struct bfd_link_info *info);
880 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
881 linker for every symbol which is defined by a dynamic object and
882 referenced by a regular object. This is called after all the
883 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
884 function has been called. The hash table entry should be
885 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
886 defined in a section from a dynamic object. Dynamic object
887 sections are not included in the final link, and this function is
888 responsible for changing the value to something which the rest of
889 the link can deal with. This will normally involve adding an
890 entry to the .plt or .got or some such section, and setting the
891 symbol to point to that. */
892 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
893 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
895 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
896 after all the linker input files have been seen but before the
897 section sizes have been set. This is called after
898 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
899 bfd_boolean (*elf_backend_always_size_sections)
900 (bfd *output_bfd, struct bfd_link_info *info);
902 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
903 linker after all the linker input files have been seen but before
904 the sections sizes have been set. This is called after
905 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
906 It is only called when linking against a dynamic object. It must
907 set the sizes of the dynamic sections, and may fill in their
908 contents as well. The generic ELF linker can handle the .dynsym,
909 .dynstr and .hash sections. This function must handle the
910 .interp section and any sections created by the
911 CREATE_DYNAMIC_SECTIONS entry point. */
912 bfd_boolean (*elf_backend_size_dynamic_sections)
913 (bfd *output_bfd, struct bfd_link_info *info);
915 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
916 we keep to use as a base for relocs and symbols. */
917 void (*elf_backend_init_index_section)
918 (bfd *output_bfd, struct bfd_link_info *info);
920 /* The RELOCATE_SECTION function is called by the ELF backend linker
921 to handle the relocations for a section.
923 The relocs are always passed as Rela structures; if the section
924 actually uses Rel structures, the r_addend field will always be
927 This function is responsible for adjust the section contents as
928 necessary, and (if using Rela relocs and generating a
929 relocatable output file) adjusting the reloc addend as
932 This function does not have to worry about setting the reloc
933 address or the reloc symbol index.
935 LOCAL_SYMS is a pointer to the swapped in local symbols.
937 LOCAL_SECTIONS is an array giving the section in the input file
938 corresponding to the st_shndx field of each local symbol.
940 The global hash table entry for the global symbols can be found
941 via elf_sym_hashes (input_bfd).
943 When generating relocatable output, this function must handle
944 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
945 going to be the section symbol corresponding to the output
946 section, which means that the addend must be adjusted
949 Returns FALSE on error, TRUE on success, 2 if successful and
950 relocations should be written for this section. */
951 int (*elf_backend_relocate_section)
952 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
953 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
954 Elf_Internal_Sym *local_syms, asection **local_sections);
956 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
957 linker just before it writes a symbol out to the .dynsym section.
958 The processor backend may make any required adjustment to the
959 symbol. It may also take the opportunity to set contents of the
960 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
961 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
962 on those symbols which are defined by a dynamic object. */
963 bfd_boolean (*elf_backend_finish_dynamic_symbol)
964 (bfd *output_bfd, struct bfd_link_info *info,
965 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
967 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
968 linker just before it writes all the dynamic sections out to the
969 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
970 all dynamic symbols. */
971 bfd_boolean (*elf_backend_finish_dynamic_sections)
972 (bfd *output_bfd, struct bfd_link_info *info);
974 /* A function to do any beginning processing needed for the ELF file
975 before building the ELF headers and computing file positions. */
976 void (*elf_backend_begin_write_processing)
977 (bfd *, struct bfd_link_info *);
979 /* A function to do any final processing needed for the ELF file
980 before writing it out. The LINKER argument is TRUE if this BFD
981 was created by the ELF backend linker. */
982 void (*elf_backend_final_write_processing)
983 (bfd *, bfd_boolean linker);
985 /* This function is called by get_program_header_size. It should
986 return the number of additional program segments which this BFD
987 will need. It should return -1 on error. */
988 int (*elf_backend_additional_program_headers)
989 (bfd *, struct bfd_link_info *);
991 /* This function is called to modify an existing segment map in a
992 backend specific fashion. */
993 bfd_boolean (*elf_backend_modify_segment_map)
994 (bfd *, struct bfd_link_info *);
996 /* This function is called to modify program headers just before
998 bfd_boolean (*elf_backend_modify_program_headers)
999 (bfd *, struct bfd_link_info *);
1001 /* This function is called before section garbage collection to
1002 mark entry symbol sections. */
1004 (struct bfd_link_info *);
1006 /* This function is called during section garbage collection to
1007 mark sections that define global symbols. */
1008 bfd_boolean (*gc_mark_dynamic_ref)
1009 (struct elf_link_hash_entry *, void *);
1011 /* This function is called during section gc to discover the section a
1012 particular relocation refers to. */
1013 elf_gc_mark_hook_fn gc_mark_hook;
1015 /* This function, if defined, is called after the first gc marking pass
1016 to allow the backend to mark additional sections. */
1017 bfd_boolean (*gc_mark_extra_sections)
1018 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1020 /* This function, if defined, is called during the sweep phase of gc
1021 in order that a backend might update any data structures it might
1023 bfd_boolean (*gc_sweep_hook)
1024 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1026 /* This function, if defined, is called after the ELF headers have
1027 been created. This allows for things like the OS and ABI versions
1029 void (*elf_backend_post_process_headers)
1030 (bfd *, struct bfd_link_info *);
1032 /* This function, if defined, prints a symbol to file and returns the
1033 name of the symbol to be printed. It should return NULL to fall
1034 back to default symbol printing. */
1035 const char *(*elf_backend_print_symbol_all)
1036 (bfd *, void *, asymbol *);
1038 /* This function, if defined, is called after all local symbols and
1039 global symbols converted to locals are emitted into the symtab
1040 section. It allows the backend to emit special local symbols
1041 not handled in the hash table. */
1042 bfd_boolean (*elf_backend_output_arch_local_syms)
1043 (bfd *, struct bfd_link_info *, void *,
1044 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1045 struct elf_link_hash_entry *));
1047 /* This function, if defined, is called after all symbols are emitted
1048 into the symtab section. It allows the backend to emit special
1049 global symbols not handled in the hash table. */
1050 bfd_boolean (*elf_backend_output_arch_syms)
1051 (bfd *, struct bfd_link_info *, void *,
1052 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1053 struct elf_link_hash_entry *));
1055 /* Copy any information related to dynamic linking from a pre-existing
1056 symbol to a newly created symbol. Also called to copy flags and
1057 other back-end info to a weakdef, in which case the symbol is not
1058 newly created and plt/got refcounts and dynamic indices should not
1060 void (*elf_backend_copy_indirect_symbol)
1061 (struct bfd_link_info *, struct elf_link_hash_entry *,
1062 struct elf_link_hash_entry *);
1064 /* Modify any information related to dynamic linking such that the
1065 symbol is not exported. */
1066 void (*elf_backend_hide_symbol)
1067 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1069 /* A function to do additional symbol fixup, called by
1070 _bfd_elf_fix_symbol_flags. */
1071 bfd_boolean (*elf_backend_fixup_symbol)
1072 (struct bfd_link_info *, struct elf_link_hash_entry *);
1074 /* Merge the backend specific symbol attribute. */
1075 void (*elf_backend_merge_symbol_attribute)
1076 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1079 /* This function, if defined, will return a string containing the
1080 name of a target-specific dynamic tag. */
1081 char *(*elf_backend_get_target_dtag)
1084 /* Decide whether an undefined symbol is special and can be ignored.
1085 This is the case for OPTIONAL symbols on IRIX. */
1086 bfd_boolean (*elf_backend_ignore_undef_symbol)
1087 (struct elf_link_hash_entry *);
1089 /* Emit relocations. Overrides default routine for emitting relocs,
1090 except during a relocatable link, or if all relocs are being emitted. */
1091 bfd_boolean (*elf_backend_emit_relocs)
1092 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1093 struct elf_link_hash_entry **);
1095 /* Count relocations. Not called for relocatable links
1096 or if all relocs are being preserved in the output. */
1097 unsigned int (*elf_backend_count_relocs)
1098 (struct bfd_link_info *, asection *);
1100 /* This function, if defined, is called when an NT_PRSTATUS note is found
1102 bfd_boolean (*elf_backend_grok_prstatus)
1103 (bfd *, Elf_Internal_Note *);
1105 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1106 note is found in a core file. */
1107 bfd_boolean (*elf_backend_grok_psinfo)
1108 (bfd *, Elf_Internal_Note *);
1110 /* This function, if defined, is called to write a note to a corefile. */
1111 char *(*elf_backend_write_core_note)
1112 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1114 /* This function returns class of a reloc type. */
1115 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1116 (const Elf_Internal_Rela *);
1118 /* This function, if defined, removes information about discarded functions
1119 from other sections which mention them. */
1120 bfd_boolean (*elf_backend_discard_info)
1121 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1123 /* This function, if defined, signals that the function above has removed
1124 the discarded relocations for this section. */
1125 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1128 /* What to do when ld finds relocations against symbols defined in
1129 discarded sections. */
1130 unsigned int (*action_discarded)
1133 /* This function returns the width of FDE pointers in bytes, or 0 if
1134 that can't be determined for some reason. The default definition
1135 goes by the bfd's EI_CLASS. */
1136 unsigned int (*elf_backend_eh_frame_address_size)
1137 (bfd *, asection *);
1139 /* These functions tell elf-eh-frame whether to attempt to turn
1140 absolute or lsda encodings into pc-relative ones. The default
1141 definition enables these transformations. */
1142 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1143 (bfd *, struct bfd_link_info *, asection *);
1144 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1145 (bfd *, struct bfd_link_info *, asection *);
1147 /* This function returns an encoding after computing the encoded
1148 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1149 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1150 The default definition chooses a 32-bit PC-relative encoding. */
1151 bfd_byte (*elf_backend_encode_eh_address)
1152 (bfd *abfd, struct bfd_link_info *info,
1153 asection *osec, bfd_vma offset,
1154 asection *loc_sec, bfd_vma loc_offset,
1157 /* This function, if defined, may write out the given section.
1158 Returns TRUE if it did so and FALSE if the caller should. */
1159 bfd_boolean (*elf_backend_write_section)
1160 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1162 /* The level of IRIX compatibility we're striving for.
1163 MIPS ELF specific function. */
1164 irix_compat_t (*elf_backend_mips_irix_compat)
1167 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1168 (unsigned int, bfd_boolean);
1170 /* The swapping table to use when dealing with ECOFF information.
1171 Used for the MIPS ELF .mdebug section. */
1172 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1174 /* This function implements `bfd_elf_bfd_from_remote_memory';
1175 see elf.c, elfcode.h. */
1176 bfd *(*elf_backend_bfd_from_remote_memory)
1177 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1178 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
1180 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1182 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1184 /* Is symbol defined in common section? */
1185 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1187 /* Return a common section index for section. */
1188 unsigned int (*common_section_index) (asection *);
1190 /* Return a common section for section. */
1191 asection *(*common_section) (asection *);
1193 /* Return TRUE if we can merge 2 definitions. */
1194 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1195 struct elf_link_hash_entry **,
1196 struct elf_link_hash_entry *,
1197 Elf_Internal_Sym *, asection **,
1198 bfd_vma *, unsigned int *,
1199 bfd_boolean *, bfd_boolean *,
1200 bfd_boolean *, bfd_boolean *,
1201 bfd_boolean *, bfd_boolean *,
1202 bfd_boolean *, bfd_boolean *,
1204 bfd_boolean *, bfd_boolean *,
1205 bfd_boolean *, bfd_boolean *,
1206 bfd *, asection **);
1208 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1209 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1211 /* Return TRUE if type is a function symbol type. */
1212 bfd_boolean (*is_function_type) (unsigned int type);
1214 /* Used to handle bad SHF_LINK_ORDER input. */
1215 bfd_error_handler_type link_order_error_handler;
1217 /* Name of the PLT relocation section. */
1218 const char *relplt_name;
1220 /* Alternate EM_xxxx machine codes for this backend. */
1221 int elf_machine_alt1;
1222 int elf_machine_alt2;
1224 const struct elf_size_info *s;
1226 /* An array of target specific special sections. */
1227 const struct bfd_elf_special_section *special_sections;
1229 /* The size in bytes of the header for the GOT. This includes the
1230 so-called reserved entries on some systems. */
1231 bfd_vma got_header_size;
1233 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1234 otherwise by the local symbol with index SYMNDX in IBFD. */
1235 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1236 struct elf_link_hash_entry *h,
1237 bfd *ibfd, unsigned long symndx);
1239 /* The vendor name to use for a processor-standard attributes section. */
1240 const char *obj_attrs_vendor;
1242 /* The section name to use for a processor-standard attributes section. */
1243 const char *obj_attrs_section;
1245 /* Return 1, 2 or 3 to indicate what type of arguments a
1246 processor-specific tag takes. */
1247 int (*obj_attrs_arg_type) (int);
1249 /* The section type to use for an attributes section. */
1250 unsigned int obj_attrs_section_type;
1252 /* This function determines the order in which any attributes are
1253 written. It must be defined for input in the range
1254 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1255 is used in order to make unity easy). The returned value is the
1256 actual tag number to place in the input position. */
1257 int (*obj_attrs_order) (int);
1259 /* This is non-zero if static TLS segments require a special alignment. */
1260 unsigned static_tls_alignment;
1262 /* This is TRUE if the linker should act like collect and gather
1263 global constructors and destructors by name. This is TRUE for
1264 MIPS ELF because the Irix 5 tools can not handle the .init
1266 unsigned collect : 1;
1268 /* This is TRUE if the linker should ignore changes to the type of a
1269 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1270 record undefined functions as STT_OBJECT although the definitions
1272 unsigned type_change_ok : 1;
1274 /* Whether the backend may use REL relocations. (Some backends use
1275 both REL and RELA relocations, and this flag is set for those
1277 unsigned may_use_rel_p : 1;
1279 /* Whether the backend may use RELA relocations. (Some backends use
1280 both REL and RELA relocations, and this flag is set for those
1282 unsigned may_use_rela_p : 1;
1284 /* Whether the default relocation type is RELA. If a backend with
1285 this flag set wants REL relocations for a particular section,
1286 it must note that explicitly. Similarly, if this flag is clear,
1287 and the backend wants RELA relocations for a particular
1289 unsigned default_use_rela_p : 1;
1291 /* True if PLT and copy relocations should be RELA by default. */
1292 unsigned rela_plts_and_copies_p : 1;
1294 /* Set if RELA relocations for a relocatable link can be handled by
1295 generic code. Backends that set this flag need do nothing in the
1296 backend relocate_section routine for relocatable linking. */
1297 unsigned rela_normal : 1;
1299 /* TRUE if addresses "naturally" sign extend. This is used when
1300 swapping in from Elf32 when BFD64. */
1301 unsigned sign_extend_vma : 1;
1303 unsigned want_got_plt : 1;
1304 unsigned plt_readonly : 1;
1305 unsigned want_plt_sym : 1;
1306 unsigned plt_not_loaded : 1;
1307 unsigned plt_alignment : 4;
1308 unsigned can_gc_sections : 1;
1309 unsigned can_refcount : 1;
1310 unsigned want_got_sym : 1;
1311 unsigned want_dynbss : 1;
1313 /* Targets which do not support physical addressing often require
1314 that the p_paddr field in the section header to be set to zero.
1315 This field indicates whether this behavior is required. */
1316 unsigned want_p_paddr_set_to_zero : 1;
1318 /* True if an object file lacking a .note.GNU-stack section
1319 should be assumed to be requesting exec stack. At least one
1320 other file in the link needs to have a .note.GNU-stack section
1321 for a PT_GNU_STACK segment to be created. */
1322 unsigned default_execstack : 1;
1325 /* Information about reloc sections associated with a bfd_elf_section_data
1327 struct bfd_elf_section_reloc_data
1329 /* The ELF header for the reloc section associated with this
1331 Elf_Internal_Shdr *hdr;
1332 /* The number of relocations currently assigned to HDR. */
1334 /* The ELF section number of the reloc section. Only used for an
1337 /* Used by the backend linker to store the symbol hash table entries
1338 associated with relocs against global symbols. */
1339 struct elf_link_hash_entry **hashes;
1342 /* Information stored for each BFD section in an ELF file. This
1343 structure is allocated by elf_new_section_hook. */
1345 struct bfd_elf_section_data
1347 /* The ELF header for this section. */
1348 Elf_Internal_Shdr this_hdr;
1350 /* Information about the REL and RELA reloc sections associated
1351 with this section, if any. */
1352 struct bfd_elf_section_reloc_data rel, rela;
1354 /* The ELF section number of this section. */
1357 /* Used by the backend linker when generating a shared library to
1358 record the dynamic symbol index for a section symbol
1359 corresponding to this section. A value of 0 means that there is
1360 no dynamic symbol for this section. */
1363 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1364 asection *linked_to;
1366 /* A pointer to the swapped relocs. If the section uses REL relocs,
1367 rather than RELA, all the r_addend fields will be zero. This
1368 pointer may be NULL. It is used by the backend linker. */
1369 Elf_Internal_Rela *relocs;
1371 /* A pointer to a linked list tracking dynamic relocs copied for
1375 /* A pointer to the bfd section used for dynamic relocs. */
1379 /* Group name, if this section is a member of a group. */
1382 /* Group signature sym, if this is the SHT_GROUP section. */
1383 struct bfd_symbol *id;
1386 /* For a member of a group, points to the SHT_GROUP section.
1387 NULL for the SHT_GROUP section itself and non-group sections. */
1388 asection *sec_group;
1390 /* A linked list of member sections in the group. Circular when used by
1391 the linker. For the SHT_GROUP section, points at first member. */
1392 asection *next_in_group;
1394 /* The FDEs associated with this section. The u.fde.next_in_section
1395 field acts as a chain pointer. */
1396 struct eh_cie_fde *fde_list;
1398 /* A pointer used for various section optimizations. */
1402 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1403 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1404 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1405 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1406 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1407 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1408 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1409 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1410 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1412 #define xvec_get_elf_backend_data(xvec) \
1413 ((const struct elf_backend_data *) (xvec)->backend_data)
1415 #define get_elf_backend_data(abfd) \
1416 xvec_get_elf_backend_data ((abfd)->xvec)
1418 /* The least object attributes (within an attributes subsection) known
1419 for any target. Some code assumes that the value 0 is not used and
1420 the field for that attribute can instead be used as a marker to
1421 indicate that attributes have been initialized. */
1422 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1424 /* The maximum number of known object attributes for any target. */
1425 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1427 /* The value of an object attribute. The type indicates whether the attribute
1428 holds and integer, a string, or both. It can also indicate that there can
1429 be no default (i.e. all values must be written to file, even zero). */
1431 typedef struct obj_attribute
1433 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1434 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1435 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1437 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1438 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1439 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1446 typedef struct obj_attribute_list
1448 struct obj_attribute_list *next;
1451 } obj_attribute_list;
1453 /* Object attributes may either be defined by the processor ABI, index
1454 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1455 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1456 #define OBJ_ATTR_PROC 0
1457 #define OBJ_ATTR_GNU 1
1458 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1459 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1461 /* The following object attribute tags are taken as generic, for all
1462 targets and for "gnu" where there is no target standard. */
1469 Tag_compatibility = 32
1472 /* Some private data is stashed away for future use using the tdata pointer
1473 in the bfd structure. */
1475 struct elf_obj_tdata
1477 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1478 Elf_Internal_Shdr **elf_sect_ptr;
1479 Elf_Internal_Phdr *phdr;
1480 struct elf_segment_map *segment_map;
1481 struct elf_strtab_hash *strtab_ptr;
1484 unsigned int num_elf_sections; /* elf_sect_ptr size */
1485 int num_section_syms;
1486 asymbol **section_syms; /* STT_SECTION symbols for each section */
1487 Elf_Internal_Shdr symtab_hdr;
1488 Elf_Internal_Shdr shstrtab_hdr;
1489 Elf_Internal_Shdr strtab_hdr;
1490 Elf_Internal_Shdr dynsymtab_hdr;
1491 Elf_Internal_Shdr dynstrtab_hdr;
1492 Elf_Internal_Shdr dynversym_hdr;
1493 Elf_Internal_Shdr dynverref_hdr;
1494 Elf_Internal_Shdr dynverdef_hdr;
1495 Elf_Internal_Shdr symtab_shndx_hdr;
1496 unsigned int symtab_section, shstrtab_section;
1497 unsigned int strtab_section, dynsymtab_section;
1498 unsigned int symtab_shndx_section;
1499 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1500 file_ptr next_file_pos;
1501 bfd_vma gp; /* The gp value */
1502 unsigned int gp_size; /* The gp size */
1504 /* Information grabbed from an elf core file. */
1511 /* A mapping from external symbols to entries in the linker hash
1512 table, used when linking. This is indexed by the symbol index
1513 minus the sh_info field of the symbol table header. */
1514 struct elf_link_hash_entry **sym_hashes;
1516 /* Track usage and final offsets of GOT entries for local symbols.
1517 This array is indexed by symbol index. Elements are used
1518 identically to "got" in struct elf_link_hash_entry. */
1521 bfd_signed_vma *refcounts;
1523 struct got_entry **ents;
1526 /* The linker ELF emulation code needs to let the backend ELF linker
1527 know what filename should be used for a dynamic object if the
1528 dynamic object is found using a search. The emulation code then
1529 sometimes needs to know what name was actually used. Until the
1530 file has been added to the linker symbol table, this field holds
1531 the name the linker wants. After it has been added, it holds the
1532 name actually used, which will be the DT_SONAME entry if there is
1534 const char *dt_name;
1536 /* The linker emulation needs to know what audit libs
1537 are used by a dynamic object. */
1538 const char *dt_audit;
1540 /* Records the result of `get_program_header_size'. */
1541 bfd_size_type program_header_size;
1543 /* Used by find_nearest_line entry point. */
1546 /* Used by MIPS ELF find_nearest_line entry point. The structure
1547 could be included directly in this one, but there's no point to
1548 wasting the memory just for the infrequently called
1549 find_nearest_line. */
1550 struct mips_elf_find_line *find_line_info;
1552 /* A place to stash dwarf1 info for this bfd. */
1553 struct dwarf1_debug *dwarf1_find_line_info;
1555 /* A place to stash dwarf2 info for this bfd. */
1556 void *dwarf2_find_line_info;
1558 /* An array of stub sections indexed by symbol number, used by the
1559 MIPS ELF linker. FIXME: We should figure out some way to only
1560 include this field for a MIPS ELF target. */
1561 asection **local_stubs;
1562 asection **local_call_stubs;
1564 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1566 asection *eh_frame_hdr;
1568 Elf_Internal_Shdr **group_sect_ptr;
1571 /* Number of symbol version definitions we are about to emit. */
1572 unsigned int cverdefs;
1574 /* Number of symbol version references we are about to emit. */
1575 unsigned int cverrefs;
1577 /* Segment flags for the PT_GNU_STACK segment. */
1578 unsigned int stack_flags;
1580 /* Symbol version definitions in external objects. */
1581 Elf_Internal_Verdef *verdef;
1583 /* Symbol version references to external objects. */
1584 Elf_Internal_Verneed *verref;
1586 /* The Irix 5 support uses two virtual sections, which represent
1587 text/data symbols defined in dynamic objects. */
1588 asymbol *elf_data_symbol;
1589 asymbol *elf_text_symbol;
1590 asection *elf_data_section;
1591 asection *elf_text_section;
1593 /* A pointer to the .eh_frame section. */
1594 asection *eh_frame_section;
1596 /* Whether a dyanmic object was specified normally on the linker
1597 command line, or was specified when --as-needed was in effect,
1598 or was found via a DT_NEEDED entry. */
1599 enum dynamic_lib_link_class dyn_lib_class;
1601 /* This is set to TRUE if the object was created by the backend
1605 /* Irix 5 often screws up the symbol table, sorting local symbols
1606 after global symbols. This flag is set if the symbol table in
1607 this BFD appears to be screwed up. If it is, we ignore the
1608 sh_info field in the symbol table header, and always read all the
1610 bfd_boolean bad_symtab;
1612 /* Used to determine if the e_flags field has been initialized */
1613 bfd_boolean flags_init;
1615 /* Symbol buffer. */
1618 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1619 obj_attribute_list *other_obj_attributes[2];
1621 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1622 bfd_boolean (*after_write_object_contents) (bfd *);
1623 void *after_write_object_contents_info;
1625 /* NT_GNU_BUILD_ID note type. */
1626 bfd_size_type build_id_size;
1629 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1630 symbol type. Used to set the osabi field in the ELF header
1632 bfd_boolean has_ifunc_symbols;
1634 /* An identifier used to distinguish different target
1635 specific extensions to this structure. */
1636 enum elf_target_id object_id;
1639 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1641 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1642 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> program_header_size)
1643 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1644 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1645 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1646 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1647 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1648 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1649 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1650 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1651 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1652 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1653 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1654 #define elf_eh_frame_section(bfd) \
1655 (elf_tdata(bfd) -> eh_frame_section)
1656 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1657 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1658 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1659 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1660 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1661 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1662 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1663 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1664 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1665 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1666 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1667 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1668 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1669 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1670 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1671 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1672 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1673 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1674 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1675 #define elf_known_obj_attributes_proc(bfd) \
1676 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1677 #define elf_other_obj_attributes_proc(bfd) \
1678 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1680 extern void _bfd_elf_swap_verdef_in
1681 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1682 extern void _bfd_elf_swap_verdef_out
1683 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1684 extern void _bfd_elf_swap_verdaux_in
1685 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1686 extern void _bfd_elf_swap_verdaux_out
1687 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1688 extern void _bfd_elf_swap_verneed_in
1689 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1690 extern void _bfd_elf_swap_verneed_out
1691 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1692 extern void _bfd_elf_swap_vernaux_in
1693 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1694 extern void _bfd_elf_swap_vernaux_out
1695 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1696 extern void _bfd_elf_swap_versym_in
1697 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1698 extern void _bfd_elf_swap_versym_out
1699 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1701 extern unsigned int _bfd_elf_section_from_bfd_section
1702 (bfd *, asection *);
1703 extern char *bfd_elf_string_from_elf_section
1704 (bfd *, unsigned, unsigned);
1705 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1706 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1707 Elf_External_Sym_Shndx *);
1708 extern const char *bfd_elf_sym_name
1709 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1711 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1713 extern bfd_boolean _bfd_elf_print_private_bfd_data
1715 extern void bfd_elf_print_symbol
1716 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1718 extern unsigned int _bfd_elf_eh_frame_address_size
1719 (bfd *, asection *);
1720 extern bfd_byte _bfd_elf_encode_eh_address
1721 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1722 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1723 extern bfd_boolean _bfd_elf_can_make_relative
1724 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1726 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1727 (const Elf_Internal_Rela *);
1728 extern bfd_vma _bfd_elf_rela_local_sym
1729 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1730 extern bfd_vma _bfd_elf_rel_local_sym
1731 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1732 extern bfd_vma _bfd_elf_section_offset
1733 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1735 extern unsigned long bfd_elf_hash
1737 extern unsigned long bfd_elf_gnu_hash
1740 extern bfd_reloc_status_type bfd_elf_generic_reloc
1741 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1742 extern bfd_boolean bfd_elf_allocate_object
1743 (bfd *, size_t, enum elf_target_id);
1744 extern bfd_boolean bfd_elf_make_object
1746 extern bfd_boolean bfd_elf_mkcorefile
1748 extern bfd_boolean _bfd_elf_make_section_from_shdr
1749 (bfd *, Elf_Internal_Shdr *, const char *, int);
1750 extern bfd_boolean _bfd_elf_make_section_from_phdr
1751 (bfd *, Elf_Internal_Phdr *, int, const char *);
1752 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1753 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1754 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1756 extern void _bfd_elf_link_hash_copy_indirect
1757 (struct bfd_link_info *, struct elf_link_hash_entry *,
1758 struct elf_link_hash_entry *);
1759 extern void _bfd_elf_link_hash_hide_symbol
1760 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1761 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1762 (struct bfd_link_info *, struct elf_link_hash_entry *);
1763 extern bfd_boolean _bfd_elf_link_hash_table_init
1764 (struct elf_link_hash_table *, bfd *,
1765 struct bfd_hash_entry *(*)
1766 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1767 unsigned int, enum elf_target_id);
1768 extern bfd_boolean _bfd_elf_slurp_version_tables
1769 (bfd *, bfd_boolean);
1770 extern bfd_boolean _bfd_elf_merge_sections
1771 (bfd *, struct bfd_link_info *);
1772 extern bfd_boolean _bfd_elf_match_sections_by_type
1773 (bfd *, const asection *, bfd *, const asection *);
1774 extern bfd_boolean bfd_elf_is_group_section
1775 (bfd *, const struct bfd_section *);
1776 extern void _bfd_elf_section_already_linked
1777 (bfd *, struct bfd_section *, struct bfd_link_info *);
1778 extern void bfd_elf_set_group_contents
1779 (bfd *, asection *, void *);
1780 extern asection *_bfd_elf_check_kept_section
1781 (asection *, struct bfd_link_info *);
1782 extern void _bfd_elf_link_just_syms
1783 (asection *, struct bfd_link_info *);
1784 extern void _bfd_elf_copy_link_hash_symbol_type
1785 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1786 extern bfd_boolean _bfd_elf_size_group_sections
1787 (struct bfd_link_info *);
1788 extern bfd_boolean _bfd_elf_fixup_group_sections
1789 (bfd *, asection *);
1790 extern bfd_boolean _bfd_elf_copy_private_header_data
1792 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1793 (bfd *, asymbol *, bfd *, asymbol *);
1794 #define _bfd_generic_init_private_section_data \
1795 _bfd_elf_init_private_section_data
1796 extern bfd_boolean _bfd_elf_init_private_section_data
1797 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1798 extern bfd_boolean _bfd_elf_copy_private_section_data
1799 (bfd *, asection *, bfd *, asection *);
1800 extern bfd_boolean _bfd_elf_write_object_contents
1802 extern bfd_boolean _bfd_elf_write_corefile_contents
1804 extern bfd_boolean _bfd_elf_set_section_contents
1805 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1806 extern long _bfd_elf_get_symtab_upper_bound
1808 extern long _bfd_elf_canonicalize_symtab
1809 (bfd *, asymbol **);
1810 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1812 extern long _bfd_elf_canonicalize_dynamic_symtab
1813 (bfd *, asymbol **);
1814 extern long _bfd_elf_get_synthetic_symtab
1815 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1816 extern long _bfd_elf_get_reloc_upper_bound
1818 extern long _bfd_elf_canonicalize_reloc
1819 (bfd *, sec_ptr, arelent **, asymbol **);
1820 extern asection * _bfd_elf_get_dynamic_reloc_section
1821 (bfd *, asection *, bfd_boolean);
1822 extern asection * _bfd_elf_make_dynamic_reloc_section
1823 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1824 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1826 extern long _bfd_elf_canonicalize_dynamic_reloc
1827 (bfd *, arelent **, asymbol **);
1828 extern asymbol *_bfd_elf_make_empty_symbol
1830 extern void _bfd_elf_get_symbol_info
1831 (bfd *, asymbol *, symbol_info *);
1832 extern bfd_boolean _bfd_elf_is_local_label_name
1833 (bfd *, const char *);
1834 extern alent *_bfd_elf_get_lineno
1836 extern bfd_boolean _bfd_elf_set_arch_mach
1837 (bfd *, enum bfd_architecture, unsigned long);
1838 extern bfd_boolean _bfd_elf_find_nearest_line
1839 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1841 extern bfd_boolean _bfd_elf_find_line
1842 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1843 #define _bfd_generic_find_line _bfd_elf_find_line
1844 extern bfd_boolean _bfd_elf_find_inliner_info
1845 (bfd *, const char **, const char **, unsigned int *);
1846 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1847 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1848 extern int _bfd_elf_sizeof_headers
1849 (bfd *, struct bfd_link_info *);
1850 extern bfd_boolean _bfd_elf_new_section_hook
1851 (bfd *, asection *);
1852 extern bfd_boolean _bfd_elf_init_reloc_shdr
1853 (bfd *, struct bfd_elf_section_reloc_data *, asection *, bfd_boolean);
1854 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1855 (const char *, const struct bfd_elf_special_section *, unsigned int);
1856 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1857 (bfd *, asection *);
1859 /* If the target doesn't have reloc handling written yet: */
1860 extern void _bfd_elf_no_info_to_howto
1861 (bfd *, arelent *, Elf_Internal_Rela *);
1863 extern bfd_boolean bfd_section_from_shdr
1864 (bfd *, unsigned int shindex);
1865 extern bfd_boolean bfd_section_from_phdr
1866 (bfd *, Elf_Internal_Phdr *, int);
1868 extern int _bfd_elf_symbol_from_bfd_symbol
1869 (bfd *, asymbol **);
1871 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
1872 (struct sym_cache *, bfd *, unsigned long);
1873 extern asection *bfd_section_from_elf_index
1874 (bfd *, unsigned int);
1875 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1878 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1880 extern void _bfd_elf_strtab_free
1881 (struct elf_strtab_hash *);
1882 extern bfd_size_type _bfd_elf_strtab_add
1883 (struct elf_strtab_hash *, const char *, bfd_boolean);
1884 extern void _bfd_elf_strtab_addref
1885 (struct elf_strtab_hash *, bfd_size_type);
1886 extern void _bfd_elf_strtab_delref
1887 (struct elf_strtab_hash *, bfd_size_type);
1888 extern void _bfd_elf_strtab_clear_all_refs
1889 (struct elf_strtab_hash *);
1890 extern bfd_size_type _bfd_elf_strtab_size
1891 (struct elf_strtab_hash *);
1892 extern bfd_size_type _bfd_elf_strtab_offset
1893 (struct elf_strtab_hash *, bfd_size_type);
1894 extern bfd_boolean _bfd_elf_strtab_emit
1895 (bfd *, struct elf_strtab_hash *);
1896 extern void _bfd_elf_strtab_finalize
1897 (struct elf_strtab_hash *);
1899 extern void _bfd_elf_begin_eh_frame_parsing
1900 (struct bfd_link_info *info);
1901 extern void _bfd_elf_parse_eh_frame
1902 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1903 extern void _bfd_elf_end_eh_frame_parsing
1904 (struct bfd_link_info *info);
1906 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1907 (bfd *, struct bfd_link_info *, asection *,
1908 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1909 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1910 (bfd *, struct bfd_link_info *);
1911 extern bfd_vma _bfd_elf_eh_frame_section_offset
1912 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1913 extern bfd_boolean _bfd_elf_write_section_eh_frame
1914 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1915 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1916 (bfd *, struct bfd_link_info *);
1917 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1918 (struct bfd_link_info *);
1920 extern bfd_boolean _bfd_elf_merge_symbol
1921 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1922 asection **, bfd_vma *, unsigned int *,
1923 struct elf_link_hash_entry **, bfd_boolean *,
1924 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1926 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1928 extern long _bfd_elf_link_lookup_local_dynindx
1929 (struct bfd_link_info *, bfd *, long);
1930 extern bfd_boolean _bfd_elf_compute_section_file_positions
1931 (bfd *, struct bfd_link_info *);
1932 extern void _bfd_elf_assign_file_positions_for_relocs
1934 extern file_ptr _bfd_elf_assign_file_position_for_section
1935 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1937 extern bfd_boolean _bfd_elf_validate_reloc
1940 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1941 (bfd *, struct bfd_link_info *);
1942 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1943 (bfd *, struct bfd_link_info *, asection *);
1944 extern bfd_boolean _bfd_elf_create_dynamic_sections
1945 (bfd *, struct bfd_link_info *);
1946 extern bfd_boolean _bfd_elf_create_got_section
1947 (bfd *, struct bfd_link_info *);
1948 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1949 (bfd *, struct bfd_link_info *, asection *, const char *);
1950 extern void _bfd_elf_init_1_index_section
1951 (bfd *, struct bfd_link_info *);
1952 extern void _bfd_elf_init_2_index_sections
1953 (bfd *, struct bfd_link_info *);
1955 extern bfd_boolean _bfd_elfcore_make_pseudosection
1956 (bfd *, char *, size_t, ufile_ptr);
1957 extern char *_bfd_elfcore_strndup
1958 (bfd *, char *, size_t);
1960 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1961 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1963 extern bfd_boolean _bfd_elf_link_output_relocs
1964 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1965 struct elf_link_hash_entry **);
1967 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
1968 (struct elf_link_hash_entry *, asection *);
1970 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1971 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1973 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1974 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1976 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
1977 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
1979 extern bfd_boolean _bfd_elf_setup_sections
1982 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
1984 extern const bfd_target *bfd_elf32_object_p
1986 extern const bfd_target *bfd_elf32_core_file_p
1988 extern char *bfd_elf32_core_file_failing_command
1990 extern int bfd_elf32_core_file_failing_signal
1992 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1994 extern int bfd_elf32_core_file_pid
1997 extern bfd_boolean bfd_elf32_swap_symbol_in
1998 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1999 extern void bfd_elf32_swap_symbol_out
2000 (bfd *, const Elf_Internal_Sym *, void *, void *);
2001 extern void bfd_elf32_swap_reloc_in
2002 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2003 extern void bfd_elf32_swap_reloc_out
2004 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2005 extern void bfd_elf32_swap_reloca_in
2006 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2007 extern void bfd_elf32_swap_reloca_out
2008 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2009 extern void bfd_elf32_swap_phdr_in
2010 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2011 extern void bfd_elf32_swap_phdr_out
2012 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2013 extern void bfd_elf32_swap_dyn_in
2014 (bfd *, const void *, Elf_Internal_Dyn *);
2015 extern void bfd_elf32_swap_dyn_out
2016 (bfd *, const Elf_Internal_Dyn *, void *);
2017 extern long bfd_elf32_slurp_symbol_table
2018 (bfd *, asymbol **, bfd_boolean);
2019 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2021 extern int bfd_elf32_write_out_phdrs
2022 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2023 extern bfd_boolean bfd_elf32_checksum_contents
2024 (bfd * , void (*) (const void *, size_t, void *), void *);
2025 extern void bfd_elf32_write_relocs
2026 (bfd *, asection *, void *);
2027 extern bfd_boolean bfd_elf32_slurp_reloc_table
2028 (bfd *, asection *, asymbol **, bfd_boolean);
2030 extern const bfd_target *bfd_elf64_object_p
2032 extern const bfd_target *bfd_elf64_core_file_p
2034 extern char *bfd_elf64_core_file_failing_command
2036 extern int bfd_elf64_core_file_failing_signal
2038 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2040 extern int bfd_elf64_core_file_pid
2043 extern bfd_boolean bfd_elf64_swap_symbol_in
2044 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2045 extern void bfd_elf64_swap_symbol_out
2046 (bfd *, const Elf_Internal_Sym *, void *, void *);
2047 extern void bfd_elf64_swap_reloc_in
2048 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2049 extern void bfd_elf64_swap_reloc_out
2050 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2051 extern void bfd_elf64_swap_reloca_in
2052 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2053 extern void bfd_elf64_swap_reloca_out
2054 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2055 extern void bfd_elf64_swap_phdr_in
2056 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2057 extern void bfd_elf64_swap_phdr_out
2058 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2059 extern void bfd_elf64_swap_dyn_in
2060 (bfd *, const void *, Elf_Internal_Dyn *);
2061 extern void bfd_elf64_swap_dyn_out
2062 (bfd *, const Elf_Internal_Dyn *, void *);
2063 extern long bfd_elf64_slurp_symbol_table
2064 (bfd *, asymbol **, bfd_boolean);
2065 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2067 extern int bfd_elf64_write_out_phdrs
2068 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2069 extern bfd_boolean bfd_elf64_checksum_contents
2070 (bfd * , void (*) (const void *, size_t, void *), void *);
2071 extern void bfd_elf64_write_relocs
2072 (bfd *, asection *, void *);
2073 extern bfd_boolean bfd_elf64_slurp_reloc_table
2074 (bfd *, asection *, asymbol **, bfd_boolean);
2076 extern bfd_boolean _bfd_elf_default_relocs_compatible
2077 (const bfd_target *, const bfd_target *);
2079 extern bfd_boolean _bfd_elf_relocs_compatible
2080 (const bfd_target *, const bfd_target *);
2082 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2083 (bfd *, struct bfd_link_info *, const char *);
2084 extern bfd_boolean bfd_elf_link_add_symbols
2085 (bfd *, struct bfd_link_info *);
2086 extern bfd_boolean _bfd_elf_add_dynamic_entry
2087 (struct bfd_link_info *, bfd_vma, bfd_vma);
2089 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2090 (struct bfd_link_info *, struct elf_link_hash_entry *);
2092 extern int bfd_elf_link_record_local_dynamic_symbol
2093 (struct bfd_link_info *, bfd *, long);
2095 extern bfd_boolean _bfd_elf_close_and_cleanup
2098 extern bfd_boolean _bfd_elf_common_definition
2099 (Elf_Internal_Sym *);
2101 extern unsigned int _bfd_elf_common_section_index
2104 extern asection *_bfd_elf_common_section
2107 extern void _bfd_dwarf2_cleanup_debug_info
2110 extern bfd_vma _bfd_elf_default_got_elt_size
2111 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2114 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2115 (bfd *, arelent *, struct bfd_symbol *, void *,
2116 asection *, bfd *, char **);
2118 extern bfd_boolean bfd_elf_final_link
2119 (bfd *, struct bfd_link_info *);
2121 extern void _bfd_elf_gc_keep
2122 (struct bfd_link_info *info);
2124 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2125 (struct elf_link_hash_entry *h, void *inf);
2127 extern bfd_boolean bfd_elf_gc_sections
2128 (bfd *, struct bfd_link_info *);
2130 extern bfd_boolean bfd_elf_gc_record_vtinherit
2131 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2133 extern bfd_boolean bfd_elf_gc_record_vtentry
2134 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2136 extern asection *_bfd_elf_gc_mark_hook
2137 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2138 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2140 extern asection *_bfd_elf_gc_mark_rsec
2141 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2142 struct elf_reloc_cookie *);
2144 extern bfd_boolean _bfd_elf_gc_mark_reloc
2145 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2146 struct elf_reloc_cookie *);
2148 extern bfd_boolean _bfd_elf_gc_mark_fdes
2149 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2150 struct elf_reloc_cookie *);
2152 extern bfd_boolean _bfd_elf_gc_mark
2153 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2155 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2156 (bfd *, struct bfd_link_info *);
2158 extern bfd_boolean bfd_elf_gc_common_final_link
2159 (bfd *, struct bfd_link_info *);
2161 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2164 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2165 (bfd *, asection *);
2167 extern bfd_boolean _bfd_elf_map_sections_to_segments
2168 (bfd *, struct bfd_link_info *);
2170 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2172 extern int bfd_elf_get_default_section_type (flagword);
2174 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2175 (bfd * abfd, asection * section);
2177 /* Exported interface for writing elf corefile notes. */
2178 extern char *elfcore_write_note
2179 (bfd *, char *, int *, const char *, int, const void *, int);
2180 extern char *elfcore_write_prpsinfo
2181 (bfd *, char *, int *, const char *, const char *);
2182 extern char *elfcore_write_prstatus
2183 (bfd *, char *, int *, long, int, const void *);
2184 extern char * elfcore_write_pstatus
2185 (bfd *, char *, int *, long, int, const void *);
2186 extern char *elfcore_write_prfpreg
2187 (bfd *, char *, int *, const void *, int);
2188 extern char *elfcore_write_prxfpreg
2189 (bfd *, char *, int *, const void *, int);
2190 extern char *elfcore_write_xstatereg
2191 (bfd *, char *, int *, const void *, int);
2192 extern char *elfcore_write_ppc_vmx
2193 (bfd *, char *, int *, const void *, int);
2194 extern char *elfcore_write_ppc_vsx
2195 (bfd *, char *, int *, const void *, int);
2196 extern char *elfcore_write_s390_timer
2197 (bfd *, char *, int *, const void *, int);
2198 extern char *elfcore_write_s390_todcmp
2199 (bfd *, char *, int *, const void *, int);
2200 extern char *elfcore_write_s390_todpreg
2201 (bfd *, char *, int *, const void *, int);
2202 extern char *elfcore_write_s390_ctrs
2203 (bfd *, char *, int *, const void *, int);
2204 extern char *elfcore_write_s390_prefix
2205 (bfd *, char *, int *, const void *, int);
2206 extern char *elfcore_write_lwpstatus
2207 (bfd *, char *, int *, long, int, const void *);
2208 extern char *elfcore_write_register_note
2209 (bfd *, char *, int *, const char *, const void *, int);
2211 extern bfd *_bfd_elf32_bfd_from_remote_memory
2212 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2213 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2214 extern bfd *_bfd_elf64_bfd_from_remote_memory
2215 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2216 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2218 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2219 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2220 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2221 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2222 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2223 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2224 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2225 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2226 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2227 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2229 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2230 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2233 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2234 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2235 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2236 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2237 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2238 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2240 /* The linker may needs to keep track of the number of relocs that it
2241 decides to copy as dynamic relocs in check_relocs for each symbol.
2242 This is so that it can later discard them if they are found to be
2243 unnecessary. We can store the information in a field extending the
2244 regular ELF linker hash table. */
2246 struct elf_dyn_relocs
2248 struct elf_dyn_relocs *next;
2250 /* The input section of the reloc. */
2253 /* Total number of relocs copied for the input section. */
2254 bfd_size_type count;
2256 /* Number of pc-relative relocs copied for the input section. */
2257 bfd_size_type pc_count;
2260 extern bfd_boolean _bfd_elf_create_ifunc_sections
2261 (bfd *, struct bfd_link_info *);
2262 extern asection * _bfd_elf_create_ifunc_dyn_reloc
2263 (bfd *, struct bfd_link_info *, asection *sec, asection *sreloc,
2264 struct elf_dyn_relocs **);
2265 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2266 (struct bfd_link_info *, struct elf_link_hash_entry *,
2267 struct elf_dyn_relocs **, unsigned int, unsigned int);
2269 /* Large common section. */
2270 extern asection _bfd_elf_large_com_section;
2272 /* Hash for local symbol with the first section id, ID, in the input
2273 file and the local symbol index, SYM. */
2274 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2275 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2276 ^ (SYM) ^ ((ID) >> 16))
2278 /* This is the condition under which finish_dynamic_symbol will be called.
2279 If our finish_dynamic_symbol isn't called, we'll need to do something
2280 about initializing any .plt and .got entries in relocate_section. */
2281 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2283 && ((SHARED) || !(H)->forced_local) \
2284 && ((H)->dynindx != -1 || (H)->forced_local))
2286 /* This macro is to avoid lots of duplicated code in the body
2287 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2288 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2289 r_symndx, symtab_hdr, sym_hashes, \
2290 h, sec, relocation, \
2291 unresolved_reloc, warned) \
2294 /* It seems this can happen with erroneous or unsupported \
2295 input (mixing a.out and elf in an archive, for example.) */ \
2296 if (sym_hashes == NULL) \
2299 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2301 while (h->root.type == bfd_link_hash_indirect \
2302 || h->root.type == bfd_link_hash_warning) \
2303 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2306 unresolved_reloc = FALSE; \
2308 if (h->root.type == bfd_link_hash_defined \
2309 || h->root.type == bfd_link_hash_defweak) \
2311 sec = h->root.u.def.section; \
2313 || sec->output_section == NULL) \
2314 /* Set a flag that will be cleared later if we find a \
2315 relocation value for this symbol. output_section \
2316 is typically NULL for symbols satisfied by a shared \
2318 unresolved_reloc = TRUE; \
2320 relocation = (h->root.u.def.value \
2321 + sec->output_section->vma \
2322 + sec->output_offset); \
2324 else if (h->root.type == bfd_link_hash_undefweak) \
2326 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2327 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2329 else if (!info->relocatable) \
2332 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2333 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2334 if (!info->callbacks->undefined_symbol (info, \
2335 h->root.root.string, \
2338 rel->r_offset, err)) \
2342 (void) unresolved_reloc; \
2347 /* This macro is to avoid lots of duplicated code in the body of the
2348 loop over relocations in xxx_relocate_section() in the various
2351 Handle relocations against symbols from removed linkonce sections,
2352 or sections discarded by a linker script. When doing a relocatable
2353 link, we remove such relocations. Otherwise, we just want the
2354 section contents zeroed and avoid any special processing. */
2355 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2356 rel, relend, howto, contents) \
2358 if (info->relocatable \
2359 && (input_section->flags & SEC_DEBUGGING)) \
2361 /* Only remove relocations in debug sections since other \
2362 sections may require relocations. */ \
2363 Elf_Internal_Shdr *rel_hdr; \
2365 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2367 /* Avoid empty output section. */ \
2368 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2370 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2371 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2372 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2374 memmove (rel, rel + 1, (relend - rel) * sizeof (*rel)); \
2376 input_section->reloc_count--; \
2383 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); \
2385 rel->r_addend = 0; \
2389 /* Will a symbol be bound to the the definition within the shared
2390 library, if any. A unique symbol can never be bound locally. */
2391 #define SYMBOLIC_BIND(INFO, H) \
2392 (!(H)->unique_global \
2393 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2395 #endif /* _LIBELF_H_ */