1 /* BFD back-end data structures for ELF files.
2 Copyright (C) 1992-2015 Free Software Foundation, Inc.
3 Written by Cygnus Support.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
25 #include "elf/common.h"
26 #include "elf/external.h"
27 #include "elf/internal.h"
34 /* The number of entries in a section is its size divided by the size
35 of a single entry. This is normally only applicable to reloc and
36 symbol table sections.
37 PR 9934: It is possible to have relocations that do not refer to
38 symbols, thus it is also possible to have a relocation section in
39 an object file, but no symbol table. */
40 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
42 /* If size isn't specified as 64 or 32, NAME macro should fail. */
45 #define NAME(x, y) x ## 64 ## _ ## y
48 #define NAME(x, y) x ## 32 ## _ ## y
53 #define NAME(x, y) x ## NOSIZE ## _ ## y
56 #define ElfNAME(X) NAME(Elf,X)
57 #define elfNAME(X) NAME(elf,X)
59 /* Information held for an ELF symbol. The first field is the
60 corresponding asymbol. Every symbol is an ELF file is actually a
61 pointer to this structure, although it is often handled as a
62 pointer to an asymbol. */
68 /* ELF symbol information. */
69 Elf_Internal_Sym internal_elf_sym;
70 /* Backend specific information. */
73 unsigned int hppa_arg_reloc;
79 /* Version information. This is from an Elf_Internal_Versym
80 structure in a SHT_GNU_versym section. It is zero if there is no
81 version information. */
82 unsigned short version;
86 struct elf_strtab_hash;
92 bfd_signed_vma refcount;
94 struct got_entry *glist;
95 struct plt_entry *plist;
98 struct elf_link_virtual_table_entry
100 /* Virtual table entry use information. This array is nominally of size
101 size/sizeof(target_void_pointer), though we have to be able to assume
102 and track a size while the symbol is still undefined. It is indexed
103 via offset/sizeof(target_void_pointer). */
107 /* Virtual table derivation info. */
108 struct elf_link_hash_entry *parent;
111 /* ELF linker hash table entries. */
113 struct elf_link_hash_entry
115 struct bfd_link_hash_entry root;
117 /* Symbol index in output file. This is initialized to -1. It is
118 set to -2 if the symbol is used by a reloc. */
121 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
122 -1 if this is not a dynamic symbol. */
123 /* ??? Note that this is consistently used as a synonym for tests
124 against whether we can perform various simplifying transformations
125 to the code. (E.g. changing a pc-relative jump to a PLT entry
126 into a pc-relative jump to the target function.) That test, which
127 is often relatively complex, and someplaces wrong or incomplete,
128 should really be replaced by a predicate in elflink.c.
130 End result: this field -1 does not indicate that the symbol is
131 not in the dynamic symbol table, but rather that the symbol is
132 not visible outside this DSO. */
135 /* If this symbol requires an entry in the global offset table, the
136 processor specific backend uses this field to track usage and
137 final offset. Two schemes are supported: The first assumes that
138 a symbol may only have one GOT entry, and uses REFCOUNT until
139 size_dynamic_sections, at which point the contents of the .got is
140 fixed. Afterward, if OFFSET is -1, then the symbol does not
141 require a global offset table entry. The second scheme allows
142 multiple GOT entries per symbol, managed via a linked list
143 pointed to by GLIST. */
144 union gotplt_union got;
146 /* Same, but tracks a procedure linkage table entry. */
147 union gotplt_union plt;
152 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
153 unsigned int type : 8;
155 /* Symbol st_other value, symbol visibility. */
156 unsigned int other : 8;
158 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */
159 unsigned int target_internal : 8;
161 /* Symbol is referenced by a non-shared object (other than the object
162 in which it is defined). */
163 unsigned int ref_regular : 1;
164 /* Symbol is defined by a non-shared object. */
165 unsigned int def_regular : 1;
166 /* Symbol is referenced by a shared object. */
167 unsigned int ref_dynamic : 1;
168 /* Symbol is defined by a shared object. */
169 unsigned int def_dynamic : 1;
170 /* Symbol has a non-weak reference from a non-shared object (other than
171 the object in which it is defined). */
172 unsigned int ref_regular_nonweak : 1;
173 /* Dynamic symbol has been adjustd. */
174 unsigned int dynamic_adjusted : 1;
175 /* Symbol needs a copy reloc. */
176 unsigned int needs_copy : 1;
177 /* Symbol needs a procedure linkage table entry. */
178 unsigned int needs_plt : 1;
179 /* Symbol appears in a non-ELF input file. */
180 unsigned int non_elf : 1;
181 /* Symbol should be marked as hidden in the version information. */
182 unsigned int hidden : 1;
183 /* Symbol was forced to local scope due to a version script file. */
184 unsigned int forced_local : 1;
185 /* Symbol was forced to be dynamic due to a version script file. */
186 unsigned int dynamic : 1;
187 /* Symbol was marked during garbage collection. */
188 unsigned int mark : 1;
189 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
190 not currently set by all the backends. */
191 unsigned int non_got_ref : 1;
192 /* Symbol has a definition in a shared object.
193 FIXME: There is no real need for this field if def_dynamic is never
194 cleared and all places that test def_dynamic also test def_regular. */
195 unsigned int dynamic_def : 1;
196 /* Symbol has a non-weak reference from a shared object. */
197 unsigned int ref_dynamic_nonweak : 1;
198 /* Symbol is referenced with a relocation where C/C++ pointer equality
200 unsigned int pointer_equality_needed : 1;
201 /* Symbol is a unique global symbol. */
202 unsigned int unique_global : 1;
203 /* Symbol is defined by a shared library with non-default visibility
204 in a read/write section. */
205 unsigned int protected_def : 1;
207 /* String table index in .dynstr if this is a dynamic symbol. */
208 unsigned long dynstr_index;
212 /* If this is a weak defined symbol from a dynamic object, this
213 field points to a defined symbol with the same value, if there is
214 one. Otherwise it is NULL. */
215 struct elf_link_hash_entry *weakdef;
217 /* Hash value of the name computed using the ELF hash function.
218 Used part way through size_dynamic_sections, after we've finished
220 unsigned long elf_hash_value;
223 /* Version information. */
226 /* This field is used for a symbol which is not defined in a
227 regular object. It points to the version information read in
228 from the dynamic object. */
229 Elf_Internal_Verdef *verdef;
230 /* This field is used for a symbol which is defined in a regular
231 object. It is set up in size_dynamic_sections. It points to
232 the version information we should write out for this symbol. */
233 struct bfd_elf_version_tree *vertree;
236 struct elf_link_virtual_table_entry *vtable;
239 /* Will references to this symbol always reference the symbol
241 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
242 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
244 /* Will _calls_ to this symbol always call the version in this object? */
245 #define SYMBOL_CALLS_LOCAL(INFO, H) \
246 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
248 /* Common symbols that are turned into definitions don't have the
249 DEF_REGULAR flag set, so they might appear to be undefined.
250 Symbols defined in linker scripts also don't have DEF_REGULAR set. */
251 #define ELF_COMMON_DEF_P(H) \
253 && !(H)->def_dynamic \
254 && (H)->root.type == bfd_link_hash_defined)
256 /* Records local symbols to be emitted in the dynamic symbol table. */
258 struct elf_link_local_dynamic_entry
260 struct elf_link_local_dynamic_entry *next;
262 /* The input bfd this symbol came from. */
265 /* The index of the local symbol being copied. */
268 /* The index in the outgoing dynamic symbol table. */
271 /* A copy of the input symbol. */
272 Elf_Internal_Sym isym;
275 struct elf_link_loaded_list
277 struct elf_link_loaded_list *next;
281 /* Structures used by the eh_frame optimization code. */
286 /* If REMOVED == 1, this is the CIE that the FDE originally used.
287 The CIE belongs to the same .eh_frame input section as the FDE.
289 If REMOVED == 0, this is the CIE that we have chosen to use for
290 the output FDE. The CIE's REMOVED field is also 0, but the CIE
291 might belong to a different .eh_frame input section from the FDE.
293 May be NULL to signify that the FDE should be discarded. */
294 struct eh_cie_fde *cie_inf;
295 struct eh_cie_fde *next_for_section;
298 /* CIEs have three states:
300 - REMOVED && !MERGED: Slated for removal because we haven't yet
301 proven that an FDE needs it. FULL_CIE, if nonnull, points to
302 more detailed information about the CIE.
304 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
305 which may not belong to the same input section.
307 - !REMOVED: We have decided to keep this CIE. SEC is the
308 .eh_frame input section that contains the CIE. */
310 struct cie *full_cie;
311 struct eh_cie_fde *merged_with;
315 /* The offset of the personality data from the start of the CIE,
316 or 0 if the CIE doesn't have any. */
317 unsigned int personality_offset : 8;
319 /* True if we have marked relocations associated with this CIE. */
320 unsigned int gc_mark : 1;
322 /* True if we have decided to turn an absolute LSDA encoding into
323 a PC-relative one. */
324 unsigned int make_lsda_relative : 1;
326 /* True if we have decided to turn an absolute personality
327 encoding into a PC-relative one. */
328 unsigned int make_per_encoding_relative : 1;
330 /* True if the CIE contains personality data and if that
331 data uses a PC-relative encoding. Always true when
332 make_per_encoding_relative is. */
333 unsigned int per_encoding_relative : 1;
335 /* True if we need to add an 'R' (FDE encoding) entry to the
336 CIE's augmentation data. */
337 unsigned int add_fde_encoding : 1;
339 /* True if we have merged this CIE with another. */
340 unsigned int merged : 1;
343 unsigned int pad1 : 18;
346 unsigned int reloc_index;
349 unsigned int new_offset;
350 unsigned int fde_encoding : 8;
351 unsigned int lsda_encoding : 8;
352 unsigned int lsda_offset : 8;
354 /* True if this entry represents a CIE, false if it represents an FDE. */
355 unsigned int cie : 1;
357 /* True if this entry is currently marked for removal. */
358 unsigned int removed : 1;
360 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
361 augmentation data, and an associated byte to each of the CIE's FDEs. */
362 unsigned int add_augmentation_size : 1;
364 /* True if we have decided to convert absolute FDE relocations into
365 relative ones. This applies to the first relocation in the FDE,
366 which is against the code that the FDE describes. */
367 unsigned int make_relative : 1;
370 unsigned int pad1 : 4;
372 unsigned int *set_loc;
375 struct eh_frame_sec_info
379 struct eh_cie_fde entry[1];
382 struct eh_frame_array_ent
391 #define DWARF2_EH_HDR 1
392 #define COMPACT_EH_HDR 2
394 /* Endian-neutral code indicating that a function cannot be unwound. */
395 #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01
397 struct dwarf_eh_frame_hdr_info
400 unsigned int fde_count;
401 /* TRUE if .eh_frame_hdr should contain the sorted search table.
402 We build it if we successfully read all .eh_frame input sections
403 and recognize them. */
405 struct eh_frame_array_ent *array;
408 struct compact_eh_frame_hdr_info
410 unsigned int allocated_entries;
411 /* eh_frame_entry fragments. */
415 struct eh_frame_hdr_info
418 unsigned int array_count;
419 bfd_boolean frame_hdr_is_compact;
422 struct dwarf_eh_frame_hdr_info dwarf;
423 struct compact_eh_frame_hdr_info compact;
428 /* Enum used to identify target specific extensions to the elf_obj_tdata
429 and elf_link_hash_table structures. Note the enums deliberately start
430 from 1 so that we can detect an uninitialized field. The generic value
431 is last so that additions to this enum do not need to modify more than
435 AARCH64_ELF_DATA = 1,
472 struct elf_sym_strtab
474 Elf_Internal_Sym sym;
475 unsigned long dest_index;
476 unsigned long destshndx_index;
479 /* ELF linker hash table. */
481 struct elf_link_hash_table
483 struct bfd_link_hash_table root;
485 /* An identifier used to distinguish different target
486 specific extensions to this structure. */
487 enum elf_target_id hash_table_id;
489 /* Whether we have created the special dynamic sections required
490 when linking against or generating a shared object. */
491 bfd_boolean dynamic_sections_created;
493 /* True if this target has relocatable executables, so needs dynamic
495 bfd_boolean is_relocatable_executable;
497 /* The BFD used to hold special sections created by the linker.
498 This will be the first BFD found which requires these sections to
502 /* The value to use when initialising got.refcount/offset and
503 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
504 the values are refcounts. Set to init_got_offset/init_plt_offset
505 in size_dynamic_sections when the values may be offsets. */
506 union gotplt_union init_got_refcount;
507 union gotplt_union init_plt_refcount;
509 /* The value to use for got.refcount/offset and plt.refcount/offset
510 when the values may be offsets. Normally (bfd_vma) -1. */
511 union gotplt_union init_got_offset;
512 union gotplt_union init_plt_offset;
514 /* The number of symbols found in the link which must be put into
515 the .dynsym section. */
516 bfd_size_type dynsymcount;
518 /* The string table of dynamic symbols, which becomes the .dynstr
520 struct elf_strtab_hash *dynstr;
522 /* The number of symbol strings found in the link which must be put
523 into the .strtab section. */
524 bfd_size_type strtabcount;
526 /* The array size of the symbol string table, which becomes the
528 bfd_size_type strtabsize;
530 /* The array of strings, which becomes the .strtab section. */
531 struct elf_sym_strtab *strtab;
533 /* The number of buckets in the hash table in the .hash section.
534 This is based on the number of dynamic symbols. */
535 bfd_size_type bucketcount;
537 /* A linked list of DT_NEEDED names found in dynamic objects
538 included in the link. */
539 struct bfd_link_needed_list *needed;
541 /* Sections in the output bfd that provides a section symbol
542 to be used by relocations emitted against local symbols.
543 Most targets will not use data_index_section. */
544 asection *text_index_section;
545 asection *data_index_section;
547 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
548 struct elf_link_hash_entry *hgot;
550 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
551 struct elf_link_hash_entry *hplt;
553 /* The _DYNAMIC symbol. */
554 struct elf_link_hash_entry *hdynamic;
556 /* A pointer to information used to merge SEC_MERGE sections. */
559 /* Used to link stabs in sections. */
560 struct stab_info stab_info;
562 /* Used by eh_frame code when editing .eh_frame. */
563 struct eh_frame_hdr_info eh_info;
565 /* A linked list of local symbols to be added to .dynsym. */
566 struct elf_link_local_dynamic_entry *dynlocal;
568 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
569 objects included in the link. */
570 struct bfd_link_needed_list *runpath;
572 /* Cached first output tls section and size of PT_TLS segment. */
574 bfd_size_type tls_size;
576 /* A linked list of BFD's loaded in the link. */
577 struct elf_link_loaded_list *loaded;
579 /* Short-cuts to get to dynamic linker sections. */
591 /* Look up an entry in an ELF linker hash table. */
593 #define elf_link_hash_lookup(table, string, create, copy, follow) \
594 ((struct elf_link_hash_entry *) \
595 bfd_link_hash_lookup (&(table)->root, (string), (create), \
598 /* Traverse an ELF linker hash table. */
600 #define elf_link_hash_traverse(table, func, info) \
601 (bfd_link_hash_traverse \
603 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
606 /* Get the ELF linker hash table from a link_info structure. */
608 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
610 #define elf_hash_table_id(table) ((table) -> hash_table_id)
612 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
613 #define is_elf_hash_table(htab) \
614 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
616 /* Used by bfd_sym_from_r_symndx to cache a small number of local
618 #define LOCAL_SYM_CACHE_SIZE 32
622 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
623 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
626 /* Constant information held for an ELF backend. */
628 struct elf_size_info {
629 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
630 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
632 /* The size of entries in the .hash section. */
633 unsigned char sizeof_hash_entry;
635 /* The number of internal relocations to allocate per external
637 unsigned char int_rels_per_ext_rel;
638 /* We use some fixed size arrays. This should be large enough to
639 handle all back-ends. */
640 #define MAX_INT_RELS_PER_EXT_REL 3
642 unsigned char arch_size, log_file_align;
643 unsigned char elfclass, ev_current;
644 int (*write_out_phdrs)
645 (bfd *, const Elf_Internal_Phdr *, unsigned int);
647 (*write_shdrs_and_ehdr) (bfd *);
648 bfd_boolean (*checksum_contents)
649 (bfd * , void (*) (const void *, size_t, void *), void *);
651 (bfd *, asection *, void *);
652 bfd_boolean (*swap_symbol_in)
653 (bfd *, const void *, const void *, Elf_Internal_Sym *);
654 void (*swap_symbol_out)
655 (bfd *, const Elf_Internal_Sym *, void *, void *);
656 bfd_boolean (*slurp_reloc_table)
657 (bfd *, asection *, asymbol **, bfd_boolean);
658 long (*slurp_symbol_table)
659 (bfd *, asymbol **, bfd_boolean);
661 (bfd *, const void *, Elf_Internal_Dyn *);
663 (bfd *, const Elf_Internal_Dyn *, void *);
665 /* This function is called to swap in a REL relocation. If an
666 external relocation corresponds to more than one internal
667 relocation, then all relocations are swapped in at once. */
668 void (*swap_reloc_in)
669 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
671 /* This function is called to swap out a REL relocation. */
672 void (*swap_reloc_out)
673 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
675 /* This function is called to swap in a RELA relocation. If an
676 external relocation corresponds to more than one internal
677 relocation, then all relocations are swapped in at once. */
678 void (*swap_reloca_in)
679 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
681 /* This function is called to swap out a RELA relocation. */
682 void (*swap_reloca_out)
683 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
686 #define elf_symbol_from(ABFD,S) \
687 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
688 && (S)->the_bfd->tdata.elf_obj_data != 0) \
689 ? (elf_symbol_type *) (S) \
692 enum elf_reloc_type_class {
694 reloc_class_relative,
700 struct elf_reloc_cookie
702 Elf_Internal_Rela *rels, *rel, *relend;
703 Elf_Internal_Sym *locsyms;
707 struct elf_link_hash_entry **sym_hashes;
709 bfd_boolean bad_symtab;
712 /* The level of IRIX compatibility we're striving for. */
720 /* Mapping of ELF section names and types. */
721 struct bfd_elf_special_section
725 /* 0 means name must match PREFIX exactly.
726 -1 means name must start with PREFIX followed by an arbitrary string.
727 -2 means name must match PREFIX exactly or consist of PREFIX followed
728 by a dot then anything.
729 > 0 means name must start with the first PREFIX_LENGTH chars of
730 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
736 enum action_discarded
742 typedef asection * (*elf_gc_mark_hook_fn)
743 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
744 struct elf_link_hash_entry *, Elf_Internal_Sym *);
746 struct elf_backend_data
748 /* The architecture for this backend. */
749 enum bfd_architecture arch;
751 /* An identifier used to distinguish different target specific
752 extensions to elf_obj_tdata and elf_link_hash_table structures. */
753 enum elf_target_id target_id;
755 /* The ELF machine code (EM_xxxx) for this backend. */
756 int elf_machine_code;
761 /* The maximum page size for this backend. */
764 /* The minimum page size for this backend. An input object will not be
765 considered page aligned unless its sections are correctly aligned for
766 pages at least this large. May be smaller than maxpagesize. */
769 /* The common page size for this backend. */
770 bfd_vma commonpagesize;
772 /* The BFD flags applied to sections created for dynamic linking. */
773 flagword dynamic_sec_flags;
775 /* Architecture-specific data for this backend.
776 This is actually a pointer to some type like struct elf_ARCH_data. */
777 const void *arch_data;
779 /* A function to translate an ELF RELA relocation to a BFD arelent
781 void (*elf_info_to_howto)
782 (bfd *, arelent *, Elf_Internal_Rela *);
784 /* A function to translate an ELF REL relocation to a BFD arelent
786 void (*elf_info_to_howto_rel)
787 (bfd *, arelent *, Elf_Internal_Rela *);
789 /* A function to determine whether a symbol is global when
790 partitioning the symbol table into local and global symbols.
791 This should be NULL for most targets, in which case the correct
792 thing will be done. MIPS ELF, at least on the Irix 5, has
793 special requirements. */
794 bfd_boolean (*elf_backend_sym_is_global)
797 /* The remaining functions are hooks which are called only if they
800 /* A function to permit a backend specific check on whether a
801 particular BFD format is relevant for an object file, and to
802 permit the backend to set any global information it wishes. When
803 this is called elf_elfheader is set, but anything else should be
804 used with caution. If this returns FALSE, the check_format
805 routine will return a bfd_error_wrong_format error. */
806 bfd_boolean (*elf_backend_object_p)
809 /* A function to do additional symbol processing when reading the
810 ELF symbol table. This is where any processor-specific special
811 section indices are handled. */
812 void (*elf_backend_symbol_processing)
815 /* A function to do additional symbol processing after reading the
816 entire ELF symbol table. */
817 bfd_boolean (*elf_backend_symbol_table_processing)
818 (bfd *, elf_symbol_type *, unsigned int);
820 /* A function to set the type of the info field. Processor-specific
821 types should be handled here. */
822 int (*elf_backend_get_symbol_type)
823 (Elf_Internal_Sym *, int);
825 /* A function to return the linker hash table entry of a symbol that
826 might be satisfied by an archive symbol. */
827 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
828 (bfd *, struct bfd_link_info *, const char *);
830 /* Return true if local section symbols should have a non-null st_name.
831 NULL implies false. */
832 bfd_boolean (*elf_backend_name_local_section_symbols)
835 /* A function to do additional processing on the ELF section header
836 just before writing it out. This is used to set the flags and
837 type fields for some sections, or to actually write out data for
839 bfd_boolean (*elf_backend_section_processing)
840 (bfd *, Elf_Internal_Shdr *);
842 /* A function to handle unusual section types when creating BFD
843 sections from ELF sections. */
844 bfd_boolean (*elf_backend_section_from_shdr)
845 (bfd *, Elf_Internal_Shdr *, const char *, int);
847 /* A function to convert machine dependent ELF section header flags to
848 BFD internal section header flags. */
849 bfd_boolean (*elf_backend_section_flags)
850 (flagword *, const Elf_Internal_Shdr *);
852 /* A function that returns a struct containing ELF section flags and
853 type for the given BFD section. */
854 const struct bfd_elf_special_section * (*get_sec_type_attr)
857 /* A function to handle unusual program segment types when creating BFD
858 sections from ELF program segments. */
859 bfd_boolean (*elf_backend_section_from_phdr)
860 (bfd *, Elf_Internal_Phdr *, int, const char *);
862 /* A function to set up the ELF section header for a BFD section in
863 preparation for writing it out. This is where the flags and type
864 fields are set for unusual sections. */
865 bfd_boolean (*elf_backend_fake_sections)
866 (bfd *, Elf_Internal_Shdr *, asection *);
868 /* A function to get the ELF section index for a BFD section. If
869 this returns TRUE, the section was found. If it is a normal ELF
870 section, *RETVAL should be left unchanged. If it is not a normal
871 ELF section *RETVAL should be set to the SHN_xxxx index. */
872 bfd_boolean (*elf_backend_section_from_bfd_section)
873 (bfd *, asection *, int *retval);
875 /* If this field is not NULL, it is called by the add_symbols phase
876 of a link just before adding a symbol to the global linker hash
877 table. It may modify any of the fields as it wishes. If *NAME
878 is set to NULL, the symbol will be skipped rather than being
879 added to the hash table. This function is responsible for
880 handling all processor dependent symbol bindings and section
881 indices, and must set at least *FLAGS and *SEC for each processor
882 dependent case; failure to do so will cause a link error. */
883 bfd_boolean (*elf_add_symbol_hook)
884 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
885 const char **name, flagword *flags, asection **sec, bfd_vma *value);
887 /* If this field is not NULL, it is called by the elf_link_output_sym
888 phase of a link for each symbol which will appear in the object file.
889 On error, this function returns 0. 1 is returned when the symbol
890 should be output, 2 is returned when the symbol should be discarded. */
891 int (*elf_backend_link_output_symbol_hook)
892 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
893 asection *, struct elf_link_hash_entry *);
895 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
896 linker the first time it encounters a dynamic object in the link.
897 This function must create any sections required for dynamic
898 linking. The ABFD argument is a dynamic object. The .interp,
899 .dynamic, .dynsym, .dynstr, and .hash functions have already been
900 created, and this function may modify the section flags if
901 desired. This function will normally create the .got and .plt
902 sections, but different backends have different requirements. */
903 bfd_boolean (*elf_backend_create_dynamic_sections)
904 (bfd *abfd, struct bfd_link_info *info);
906 /* When creating a shared library, determine whether to omit the
907 dynamic symbol for the section. */
908 bfd_boolean (*elf_backend_omit_section_dynsym)
909 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
911 /* Return TRUE if relocations of targets are compatible to the extent
912 that CHECK_RELOCS will properly process them. PR 4424. */
913 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
915 /* The CHECK_RELOCS function is called by the add_symbols phase of
916 the ELF backend linker. It is called once for each section with
917 relocs of an object file, just after the symbols for the object
918 file have been added to the global linker hash table. The
919 function must look through the relocs and do any special handling
920 required. This generally means allocating space in the global
921 offset table, and perhaps allocating space for a reloc. The
922 relocs are always passed as Rela structures; if the section
923 actually uses Rel structures, the r_addend field will always be
925 bfd_boolean (*check_relocs)
926 (bfd *abfd, struct bfd_link_info *info, asection *o,
927 const Elf_Internal_Rela *relocs);
929 /* The CHECK_DIRECTIVES function is called once per input file by
930 the add_symbols phase of the ELF backend linker. The function
931 must inspect the bfd and create any additional symbols according
932 to any custom directives in the bfd. */
933 bfd_boolean (*check_directives)
934 (bfd *abfd, struct bfd_link_info *info);
936 /* The NOTICE_AS_NEEDED function is called as the linker is about to
937 handle an as-needed lib (ACT = notice_as_needed), and after the
938 linker has decided to keep the lib (ACT = notice_needed) or when
939 the lib is not needed (ACT = notice_not_needed). */
940 bfd_boolean (*notice_as_needed)
941 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act);
943 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
944 linker for every symbol which is defined by a dynamic object and
945 referenced by a regular object. This is called after all the
946 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
947 function has been called. The hash table entry should be
948 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
949 defined in a section from a dynamic object. Dynamic object
950 sections are not included in the final link, and this function is
951 responsible for changing the value to something which the rest of
952 the link can deal with. This will normally involve adding an
953 entry to the .plt or .got or some such section, and setting the
954 symbol to point to that. */
955 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
956 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
958 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
959 after all the linker input files have been seen but before the
960 section sizes have been set. This is called after
961 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
962 bfd_boolean (*elf_backend_always_size_sections)
963 (bfd *output_bfd, struct bfd_link_info *info);
965 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
966 linker after all the linker input files have been seen but before
967 the sections sizes have been set. This is called after
968 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
969 It is only called when linking against a dynamic object. It must
970 set the sizes of the dynamic sections, and may fill in their
971 contents as well. The generic ELF linker can handle the .dynsym,
972 .dynstr and .hash sections. This function must handle the
973 .interp section and any sections created by the
974 CREATE_DYNAMIC_SECTIONS entry point. */
975 bfd_boolean (*elf_backend_size_dynamic_sections)
976 (bfd *output_bfd, struct bfd_link_info *info);
978 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
979 we keep to use as a base for relocs and symbols. */
980 void (*elf_backend_init_index_section)
981 (bfd *output_bfd, struct bfd_link_info *info);
983 /* The RELOCATE_SECTION function is called by the ELF backend linker
984 to handle the relocations for a section.
986 The relocs are always passed as Rela structures; if the section
987 actually uses Rel structures, the r_addend field will always be
990 This function is responsible for adjust the section contents as
991 necessary, and (if using Rela relocs and generating a
992 relocatable output file) adjusting the reloc addend as
995 This function does not have to worry about setting the reloc
996 address or the reloc symbol index.
998 LOCAL_SYMS is a pointer to the swapped in local symbols.
1000 LOCAL_SECTIONS is an array giving the section in the input file
1001 corresponding to the st_shndx field of each local symbol.
1003 The global hash table entry for the global symbols can be found
1004 via elf_sym_hashes (input_bfd).
1006 When generating relocatable output, this function must handle
1007 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1008 going to be the section symbol corresponding to the output
1009 section, which means that the addend must be adjusted
1012 Returns FALSE on error, TRUE on success, 2 if successful and
1013 relocations should be written for this section. */
1014 int (*elf_backend_relocate_section)
1015 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
1016 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
1017 Elf_Internal_Sym *local_syms, asection **local_sections);
1019 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
1020 linker just before it writes a symbol out to the .dynsym section.
1021 The processor backend may make any required adjustment to the
1022 symbol. It may also take the opportunity to set contents of the
1023 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
1024 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
1025 on those symbols which are defined by a dynamic object. */
1026 bfd_boolean (*elf_backend_finish_dynamic_symbol)
1027 (bfd *output_bfd, struct bfd_link_info *info,
1028 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
1030 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
1031 linker just before it writes all the dynamic sections out to the
1032 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
1033 all dynamic symbols. */
1034 bfd_boolean (*elf_backend_finish_dynamic_sections)
1035 (bfd *output_bfd, struct bfd_link_info *info);
1037 /* A function to do any beginning processing needed for the ELF file
1038 before building the ELF headers and computing file positions. */
1039 void (*elf_backend_begin_write_processing)
1040 (bfd *, struct bfd_link_info *);
1042 /* A function to do any final processing needed for the ELF file
1043 before writing it out. The LINKER argument is TRUE if this BFD
1044 was created by the ELF backend linker. */
1045 void (*elf_backend_final_write_processing)
1046 (bfd *, bfd_boolean linker);
1048 /* This function is called by get_program_header_size. It should
1049 return the number of additional program segments which this BFD
1050 will need. It should return -1 on error. */
1051 int (*elf_backend_additional_program_headers)
1052 (bfd *, struct bfd_link_info *);
1054 /* This function is called to modify an existing segment map in a
1055 backend specific fashion. */
1056 bfd_boolean (*elf_backend_modify_segment_map)
1057 (bfd *, struct bfd_link_info *);
1059 /* This function is called to modify program headers just before
1060 they are written. */
1061 bfd_boolean (*elf_backend_modify_program_headers)
1062 (bfd *, struct bfd_link_info *);
1064 /* This function is called before section garbage collection to
1065 mark entry symbol sections. */
1067 (struct bfd_link_info *);
1069 /* This function is called during section garbage collection to
1070 mark sections that define global symbols. */
1071 bfd_boolean (*gc_mark_dynamic_ref)
1072 (struct elf_link_hash_entry *, void *);
1074 /* This function is called during section gc to discover the section a
1075 particular relocation refers to. */
1076 elf_gc_mark_hook_fn gc_mark_hook;
1078 /* This function, if defined, is called after the first gc marking pass
1079 to allow the backend to mark additional sections. */
1080 bfd_boolean (*gc_mark_extra_sections)
1081 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1083 /* This function, if defined, is called during the sweep phase of gc
1084 in order that a backend might update any data structures it might
1086 bfd_boolean (*gc_sweep_hook)
1087 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1089 /* This function, if defined, is called after the ELF headers have
1090 been created. This allows for things like the OS and ABI versions
1092 void (*elf_backend_post_process_headers)
1093 (bfd *, struct bfd_link_info *);
1095 /* This function, if defined, prints a symbol to file and returns the
1096 name of the symbol to be printed. It should return NULL to fall
1097 back to default symbol printing. */
1098 const char *(*elf_backend_print_symbol_all)
1099 (bfd *, void *, asymbol *);
1101 /* This function, if defined, is called after all local symbols and
1102 global symbols converted to locals are emitted into the symtab
1103 section. It allows the backend to emit special local symbols
1104 not handled in the hash table. */
1105 bfd_boolean (*elf_backend_output_arch_local_syms)
1106 (bfd *, struct bfd_link_info *, void *,
1107 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1108 struct elf_link_hash_entry *));
1110 /* This function, if defined, is called after all symbols are emitted
1111 into the symtab section. It allows the backend to emit special
1112 global symbols not handled in the hash table. */
1113 bfd_boolean (*elf_backend_output_arch_syms)
1114 (bfd *, struct bfd_link_info *, void *,
1115 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1116 struct elf_link_hash_entry *));
1118 /* Copy any information related to dynamic linking from a pre-existing
1119 symbol to a newly created symbol. Also called to copy flags and
1120 other back-end info to a weakdef, in which case the symbol is not
1121 newly created and plt/got refcounts and dynamic indices should not
1123 void (*elf_backend_copy_indirect_symbol)
1124 (struct bfd_link_info *, struct elf_link_hash_entry *,
1125 struct elf_link_hash_entry *);
1127 /* Modify any information related to dynamic linking such that the
1128 symbol is not exported. */
1129 void (*elf_backend_hide_symbol)
1130 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1132 /* A function to do additional symbol fixup, called by
1133 _bfd_elf_fix_symbol_flags. */
1134 bfd_boolean (*elf_backend_fixup_symbol)
1135 (struct bfd_link_info *, struct elf_link_hash_entry *);
1137 /* Merge the backend specific symbol attribute. */
1138 void (*elf_backend_merge_symbol_attribute)
1139 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1142 /* This function, if defined, will return a string containing the
1143 name of a target-specific dynamic tag. */
1144 char *(*elf_backend_get_target_dtag)
1147 /* Decide whether an undefined symbol is special and can be ignored.
1148 This is the case for OPTIONAL symbols on IRIX. */
1149 bfd_boolean (*elf_backend_ignore_undef_symbol)
1150 (struct elf_link_hash_entry *);
1152 /* Emit relocations. Overrides default routine for emitting relocs,
1153 except during a relocatable link, or if all relocs are being emitted. */
1154 bfd_boolean (*elf_backend_emit_relocs)
1155 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1156 struct elf_link_hash_entry **);
1158 /* Count relocations. Not called for relocatable links
1159 or if all relocs are being preserved in the output. */
1160 unsigned int (*elf_backend_count_relocs)
1161 (struct bfd_link_info *, asection *);
1163 /* Say whether to sort relocs output by ld -r and ld --emit-relocs,
1164 by r_offset. If NULL, default to true. */
1165 bfd_boolean (*sort_relocs_p)
1168 /* This function, if defined, is called when an NT_PRSTATUS note is found
1170 bfd_boolean (*elf_backend_grok_prstatus)
1171 (bfd *, Elf_Internal_Note *);
1173 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1174 note is found in a core file. */
1175 bfd_boolean (*elf_backend_grok_psinfo)
1176 (bfd *, Elf_Internal_Note *);
1178 /* This function, if defined, is called to write a note to a corefile. */
1179 char *(*elf_backend_write_core_note)
1180 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1182 /* This function, if defined, is called to convert target-specific
1183 section flag names into hex values. */
1184 flagword (*elf_backend_lookup_section_flags_hook)
1187 /* This function returns class of a reloc type. */
1188 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1189 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *);
1191 /* This function, if defined, removes information about discarded functions
1192 from other sections which mention them. */
1193 bfd_boolean (*elf_backend_discard_info)
1194 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1196 /* This function, if defined, signals that the function above has removed
1197 the discarded relocations for this section. */
1198 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1201 /* What to do when ld finds relocations against symbols defined in
1202 discarded sections. */
1203 unsigned int (*action_discarded)
1206 /* This function returns the width of FDE pointers in bytes, or 0 if
1207 that can't be determined for some reason. The default definition
1208 goes by the bfd's EI_CLASS. */
1209 unsigned int (*elf_backend_eh_frame_address_size)
1210 (bfd *, asection *);
1212 /* These functions tell elf-eh-frame whether to attempt to turn
1213 absolute or lsda encodings into pc-relative ones. The default
1214 definition enables these transformations. */
1215 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1216 (bfd *, struct bfd_link_info *, asection *);
1217 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1218 (bfd *, struct bfd_link_info *, asection *);
1220 /* This function returns an encoding after computing the encoded
1221 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1222 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1223 The default definition chooses a 32-bit PC-relative encoding. */
1224 bfd_byte (*elf_backend_encode_eh_address)
1225 (bfd *abfd, struct bfd_link_info *info,
1226 asection *osec, bfd_vma offset,
1227 asection *loc_sec, bfd_vma loc_offset,
1230 /* This function, if defined, may write out the given section.
1231 Returns TRUE if it did so and FALSE if the caller should. */
1232 bfd_boolean (*elf_backend_write_section)
1233 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1235 /* The level of IRIX compatibility we're striving for.
1236 MIPS ELF specific function. */
1237 irix_compat_t (*elf_backend_mips_irix_compat)
1240 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1241 (unsigned int, bfd_boolean);
1243 /* The swapping table to use when dealing with ECOFF information.
1244 Used for the MIPS ELF .mdebug section. */
1245 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1247 /* This function implements `bfd_elf_bfd_from_remote_memory';
1248 see elf.c, elfcode.h. */
1249 bfd *(*elf_backend_bfd_from_remote_memory)
1250 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
1251 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1252 bfd_size_type len));
1254 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1256 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1258 /* Is symbol defined in common section? */
1259 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1261 /* Return a common section index for section. */
1262 unsigned int (*common_section_index) (asection *);
1264 /* Return a common section for section. */
1265 asection *(*common_section) (asection *);
1267 /* Return TRUE if we can merge 2 definitions. */
1268 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *,
1269 const Elf_Internal_Sym *, asection **,
1270 bfd_boolean, bfd_boolean,
1271 bfd *, const asection *);
1273 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1274 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1276 /* Return TRUE if type is a function symbol type. */
1277 bfd_boolean (*is_function_type) (unsigned int type);
1279 /* If the ELF symbol SYM might be a function in SEC, return the
1280 function size and set *CODE_OFF to the function's entry point,
1281 otherwise return zero. */
1282 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1285 /* Return the section which RELOC_SEC applies to. */
1286 asection *(*get_reloc_section) (asection *reloc_sec);
1288 /* Used to handle bad SHF_LINK_ORDER input. */
1289 bfd_error_handler_type link_order_error_handler;
1291 /* Name of the PLT relocation section. */
1292 const char *relplt_name;
1294 /* Alternate EM_xxxx machine codes for this backend. */
1295 int elf_machine_alt1;
1296 int elf_machine_alt2;
1298 const struct elf_size_info *s;
1300 /* An array of target specific special sections. */
1301 const struct bfd_elf_special_section *special_sections;
1303 /* The size in bytes of the header for the GOT. This includes the
1304 so-called reserved entries on some systems. */
1305 bfd_vma got_header_size;
1307 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1308 otherwise by the local symbol with index SYMNDX in IBFD. */
1309 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1310 struct elf_link_hash_entry *h,
1311 bfd *ibfd, unsigned long symndx);
1313 /* The vendor name to use for a processor-standard attributes section. */
1314 const char *obj_attrs_vendor;
1316 /* The section name to use for a processor-standard attributes section. */
1317 const char *obj_attrs_section;
1319 /* Return 1, 2 or 3 to indicate what type of arguments a
1320 processor-specific tag takes. */
1321 int (*obj_attrs_arg_type) (int);
1323 /* The section type to use for an attributes section. */
1324 unsigned int obj_attrs_section_type;
1326 /* This function determines the order in which any attributes are
1327 written. It must be defined for input in the range
1328 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1329 is used in order to make unity easy). The returned value is the
1330 actual tag number to place in the input position. */
1331 int (*obj_attrs_order) (int);
1333 /* Handle merging unknown attributes; either warn and return TRUE,
1334 or give an error and return FALSE. */
1335 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1337 /* Encoding used for compact EH tables. */
1338 int (*compact_eh_encoding) (struct bfd_link_info *);
1340 /* Opcode representing no unwind. */
1341 int (*cant_unwind_opcode) (struct bfd_link_info *);
1343 /* This is non-zero if static TLS segments require a special alignment. */
1344 unsigned static_tls_alignment;
1346 /* Alignment for the PT_GNU_STACK segment. */
1347 unsigned stack_align;
1349 /* This is TRUE if the linker should act like collect and gather
1350 global constructors and destructors by name. This is TRUE for
1351 MIPS ELF because the Irix 5 tools can not handle the .init
1353 unsigned collect : 1;
1355 /* This is TRUE if the linker should ignore changes to the type of a
1356 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1357 record undefined functions as STT_OBJECT although the definitions
1359 unsigned type_change_ok : 1;
1361 /* Whether the backend may use REL relocations. (Some backends use
1362 both REL and RELA relocations, and this flag is set for those
1364 unsigned may_use_rel_p : 1;
1366 /* Whether the backend may use RELA relocations. (Some backends use
1367 both REL and RELA relocations, and this flag is set for those
1369 unsigned may_use_rela_p : 1;
1371 /* Whether the default relocation type is RELA. If a backend with
1372 this flag set wants REL relocations for a particular section,
1373 it must note that explicitly. Similarly, if this flag is clear,
1374 and the backend wants RELA relocations for a particular
1376 unsigned default_use_rela_p : 1;
1378 /* True if PLT and copy relocations should be RELA by default. */
1379 unsigned rela_plts_and_copies_p : 1;
1381 /* Set if RELA relocations for a relocatable link can be handled by
1382 generic code. Backends that set this flag need do nothing in the
1383 backend relocate_section routine for relocatable linking. */
1384 unsigned rela_normal : 1;
1386 /* TRUE if addresses "naturally" sign extend. This is used when
1387 swapping in from Elf32 when BFD64. */
1388 unsigned sign_extend_vma : 1;
1390 unsigned want_got_plt : 1;
1391 unsigned plt_readonly : 1;
1392 unsigned want_plt_sym : 1;
1393 unsigned plt_not_loaded : 1;
1394 unsigned plt_alignment : 4;
1395 unsigned can_gc_sections : 1;
1396 unsigned can_refcount : 1;
1397 unsigned want_got_sym : 1;
1398 unsigned want_dynbss : 1;
1400 /* Targets which do not support physical addressing often require
1401 that the p_paddr field in the section header to be set to zero.
1402 This field indicates whether this behavior is required. */
1403 unsigned want_p_paddr_set_to_zero : 1;
1405 /* True if an object file lacking a .note.GNU-stack section
1406 should be assumed to be requesting exec stack. At least one
1407 other file in the link needs to have a .note.GNU-stack section
1408 for a PT_GNU_STACK segment to be created. */
1409 unsigned default_execstack : 1;
1411 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize
1412 in length rather than sec->size in length, if sec->rawsize is
1413 non-zero and smaller than sec->size. */
1414 unsigned caches_rawsize : 1;
1416 /* Address of protected data defined in the shared library may be
1417 external, i.e., due to copy relocation. */
1418 unsigned extern_protected_data : 1;
1421 /* Information about reloc sections associated with a bfd_elf_section_data
1423 struct bfd_elf_section_reloc_data
1425 /* The ELF header for the reloc section associated with this
1427 Elf_Internal_Shdr *hdr;
1428 /* The number of relocations currently assigned to HDR. */
1430 /* The ELF section number of the reloc section. Only used for an
1433 /* Used by the backend linker to store the symbol hash table entries
1434 associated with relocs against global symbols. */
1435 struct elf_link_hash_entry **hashes;
1438 /* Information stored for each BFD section in an ELF file. This
1439 structure is allocated by elf_new_section_hook. */
1441 struct bfd_elf_section_data
1443 /* The ELF header for this section. */
1444 Elf_Internal_Shdr this_hdr;
1446 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1447 struct flag_info *section_flag_info;
1449 /* Information about the REL and RELA reloc sections associated
1450 with this section, if any. */
1451 struct bfd_elf_section_reloc_data rel, rela;
1453 /* The ELF section number of this section. */
1456 /* Used by the backend linker when generating a shared library to
1457 record the dynamic symbol index for a section symbol
1458 corresponding to this section. A value of 0 means that there is
1459 no dynamic symbol for this section. */
1462 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1463 asection *linked_to;
1465 /* A pointer to the swapped relocs. If the section uses REL relocs,
1466 rather than RELA, all the r_addend fields will be zero. This
1467 pointer may be NULL. It is used by the backend linker. */
1468 Elf_Internal_Rela *relocs;
1470 /* A pointer to a linked list tracking dynamic relocs copied for
1474 /* A pointer to the bfd section used for dynamic relocs. */
1478 /* Group name, if this section is a member of a group. */
1481 /* Group signature sym, if this is the SHT_GROUP section. */
1482 struct bfd_symbol *id;
1485 /* For a member of a group, points to the SHT_GROUP section.
1486 NULL for the SHT_GROUP section itself and non-group sections. */
1487 asection *sec_group;
1489 /* A linked list of member sections in the group. Circular when used by
1490 the linker. For the SHT_GROUP section, points at first member. */
1491 asection *next_in_group;
1493 /* The FDEs associated with this section. The u.fde.next_in_section
1494 field acts as a chain pointer. */
1495 struct eh_cie_fde *fde_list;
1497 /* Link from a text section to its .eh_frame_entry section. */
1498 asection *eh_frame_entry;
1500 /* A pointer used for various section optimizations. */
1504 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1505 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1506 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1507 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1508 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1509 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1510 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1511 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1512 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1513 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry)
1515 #define xvec_get_elf_backend_data(xvec) \
1516 ((const struct elf_backend_data *) (xvec)->backend_data)
1518 #define get_elf_backend_data(abfd) \
1519 xvec_get_elf_backend_data ((abfd)->xvec)
1521 /* The least object attributes (within an attributes subsection) known
1522 for any target. Some code assumes that the value 0 is not used and
1523 the field for that attribute can instead be used as a marker to
1524 indicate that attributes have been initialized. */
1525 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1527 /* The maximum number of known object attributes for any target. */
1528 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1530 /* The value of an object attribute. The type indicates whether the attribute
1531 holds and integer, a string, or both. It can also indicate that there can
1532 be no default (i.e. all values must be written to file, even zero). */
1534 typedef struct obj_attribute
1536 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1537 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1538 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1540 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1541 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1542 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1549 typedef struct obj_attribute_list
1551 struct obj_attribute_list *next;
1554 } obj_attribute_list;
1556 /* Object attributes may either be defined by the processor ABI, index
1557 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1558 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1559 #define OBJ_ATTR_PROC 0
1560 #define OBJ_ATTR_GNU 1
1561 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1562 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1564 /* The following object attribute tags are taken as generic, for all
1565 targets and for "gnu" where there is no target standard. */
1572 Tag_compatibility = 32
1575 /* The following struct stores information about every SystemTap section
1576 found in the object file. */
1579 struct sdt_note *next;
1584 /* tdata information grabbed from an elf core file. */
1585 struct core_elf_obj_tdata
1594 /* Extra tdata information held for output ELF BFDs. */
1595 struct output_elf_obj_tdata
1597 struct elf_segment_map *seg_map;
1598 struct elf_strtab_hash *strtab_ptr;
1600 /* STT_SECTION symbols for each section */
1601 asymbol **section_syms;
1603 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1605 asection *eh_frame_hdr;
1607 /* NT_GNU_BUILD_ID note type info. */
1610 bfd_boolean (*after_write_object_contents) (bfd *);
1615 /* Records the result of `get_program_header_size'. */
1616 bfd_size_type program_header_size;
1618 /* Used when laying out sections. */
1619 file_ptr next_file_pos;
1621 int num_section_syms;
1622 unsigned int shstrtab_section, strtab_section;
1624 /* Segment flags for the PT_GNU_STACK segment. */
1625 unsigned int stack_flags;
1627 /* This is set to TRUE if the object was created by the backend
1631 /* Used to determine if the e_flags field has been initialized */
1632 bfd_boolean flags_init;
1635 /* Some private data is stashed away for future use using the tdata pointer
1636 in the bfd structure. */
1638 struct elf_obj_tdata
1640 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1641 Elf_Internal_Shdr **elf_sect_ptr;
1642 Elf_Internal_Phdr *phdr;
1643 Elf_Internal_Shdr symtab_hdr;
1644 Elf_Internal_Shdr shstrtab_hdr;
1645 Elf_Internal_Shdr strtab_hdr;
1646 Elf_Internal_Shdr dynsymtab_hdr;
1647 Elf_Internal_Shdr dynstrtab_hdr;
1648 Elf_Internal_Shdr dynversym_hdr;
1649 Elf_Internal_Shdr dynverref_hdr;
1650 Elf_Internal_Shdr dynverdef_hdr;
1651 Elf_Internal_Shdr symtab_shndx_hdr;
1652 bfd_vma gp; /* The gp value */
1653 unsigned int gp_size; /* The gp size */
1654 unsigned int num_elf_sections; /* elf_sect_ptr size */
1656 /* A mapping from external symbols to entries in the linker hash
1657 table, used when linking. This is indexed by the symbol index
1658 minus the sh_info field of the symbol table header. */
1659 struct elf_link_hash_entry **sym_hashes;
1661 /* Track usage and final offsets of GOT entries for local symbols.
1662 This array is indexed by symbol index. Elements are used
1663 identically to "got" in struct elf_link_hash_entry. */
1666 bfd_signed_vma *refcounts;
1668 struct got_entry **ents;
1671 /* The linker ELF emulation code needs to let the backend ELF linker
1672 know what filename should be used for a dynamic object if the
1673 dynamic object is found using a search. The emulation code then
1674 sometimes needs to know what name was actually used. Until the
1675 file has been added to the linker symbol table, this field holds
1676 the name the linker wants. After it has been added, it holds the
1677 name actually used, which will be the DT_SONAME entry if there is
1679 const char *dt_name;
1681 /* The linker emulation needs to know what audit libs
1682 are used by a dynamic object. */
1683 const char *dt_audit;
1685 /* Used by find_nearest_line entry point. */
1688 /* A place to stash dwarf1 info for this bfd. */
1689 struct dwarf1_debug *dwarf1_find_line_info;
1691 /* A place to stash dwarf2 info for this bfd. */
1692 void *dwarf2_find_line_info;
1694 /* Stash away info for yet another find line/function variant. */
1695 void *elf_find_function_cache;
1697 /* Number of symbol version definitions we are about to emit. */
1698 unsigned int cverdefs;
1700 /* Number of symbol version references we are about to emit. */
1701 unsigned int cverrefs;
1703 /* Symbol version definitions in external objects. */
1704 Elf_Internal_Verdef *verdef;
1706 /* Symbol version references to external objects. */
1707 Elf_Internal_Verneed *verref;
1709 /* A pointer to the .eh_frame section. */
1710 asection *eh_frame_section;
1712 /* Symbol buffer. */
1715 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1716 obj_attribute_list *other_obj_attributes[2];
1718 /* Linked-list containing information about every Systemtap section
1719 found in the object file. Each section corresponds to one entry
1721 struct sdt_note *sdt_note_head;
1723 Elf_Internal_Shdr **group_sect_ptr;
1726 unsigned int symtab_section, symtab_shndx_section, dynsymtab_section;
1727 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1729 /* An identifier used to distinguish different target
1730 specific extensions to this structure. */
1731 enum elf_target_id object_id;
1733 /* Whether a dyanmic object was specified normally on the linker
1734 command line, or was specified when --as-needed was in effect,
1735 or was found via a DT_NEEDED entry. */
1736 enum dynamic_lib_link_class dyn_lib_class;
1738 /* Irix 5 often screws up the symbol table, sorting local symbols
1739 after global symbols. This flag is set if the symbol table in
1740 this BFD appears to be screwed up. If it is, we ignore the
1741 sh_info field in the symbol table header, and always read all the
1743 bfd_boolean bad_symtab;
1745 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1746 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1747 field in the ELF header structure. */
1748 bfd_boolean has_gnu_symbols;
1750 /* Information grabbed from an elf core file. */
1751 struct core_elf_obj_tdata *core;
1753 /* More information held for output ELF BFDs. */
1754 struct output_elf_obj_tdata *o;
1757 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1759 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1760 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size)
1761 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1762 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1763 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1764 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map)
1765 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos)
1766 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr)
1767 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker)
1768 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags)
1769 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr)
1770 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1771 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1772 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section)
1773 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section)
1774 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1775 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1776 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1777 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1778 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1779 #define elf_eh_frame_section(bfd) \
1780 (elf_tdata(bfd) -> eh_frame_section)
1781 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms)
1782 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms)
1783 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1784 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1785 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1786 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1787 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1788 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1789 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1790 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1791 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1792 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1793 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1794 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1795 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init)
1796 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1797 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1798 #define elf_known_obj_attributes_proc(bfd) \
1799 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1800 #define elf_other_obj_attributes_proc(bfd) \
1801 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1803 extern void _bfd_elf_swap_verdef_in
1804 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1805 extern void _bfd_elf_swap_verdef_out
1806 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1807 extern void _bfd_elf_swap_verdaux_in
1808 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1809 extern void _bfd_elf_swap_verdaux_out
1810 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1811 extern void _bfd_elf_swap_verneed_in
1812 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1813 extern void _bfd_elf_swap_verneed_out
1814 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1815 extern void _bfd_elf_swap_vernaux_in
1816 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1817 extern void _bfd_elf_swap_vernaux_out
1818 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1819 extern void _bfd_elf_swap_versym_in
1820 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1821 extern void _bfd_elf_swap_versym_out
1822 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1824 extern unsigned int _bfd_elf_section_from_bfd_section
1825 (bfd *, asection *);
1826 extern char *bfd_elf_string_from_elf_section
1827 (bfd *, unsigned, unsigned);
1828 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1829 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1830 Elf_External_Sym_Shndx *);
1831 extern const char *bfd_elf_sym_name
1832 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1834 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1836 extern bfd_boolean _bfd_elf_print_private_bfd_data
1838 const char * _bfd_elf_get_symbol_version_string
1839 (bfd *, asymbol *, bfd_boolean *);
1840 extern void bfd_elf_print_symbol
1841 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1843 extern unsigned int _bfd_elf_eh_frame_address_size
1844 (bfd *, asection *);
1845 extern bfd_byte _bfd_elf_encode_eh_address
1846 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1847 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1848 extern bfd_boolean _bfd_elf_can_make_relative
1849 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1851 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1852 (const struct bfd_link_info *, const asection *,
1853 const Elf_Internal_Rela *);
1854 extern bfd_vma _bfd_elf_rela_local_sym
1855 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1856 extern bfd_vma _bfd_elf_rel_local_sym
1857 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1858 extern bfd_vma _bfd_elf_section_offset
1859 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1861 extern unsigned long bfd_elf_hash
1863 extern unsigned long bfd_elf_gnu_hash
1866 extern bfd_reloc_status_type bfd_elf_generic_reloc
1867 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1868 extern bfd_boolean bfd_elf_allocate_object
1869 (bfd *, size_t, enum elf_target_id);
1870 extern bfd_boolean bfd_elf_make_object
1872 extern bfd_boolean bfd_elf_mkcorefile
1874 extern bfd_boolean _bfd_elf_make_section_from_shdr
1875 (bfd *, Elf_Internal_Shdr *, const char *, int);
1876 extern bfd_boolean _bfd_elf_make_section_from_phdr
1877 (bfd *, Elf_Internal_Phdr *, int, const char *);
1878 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1879 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1880 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1882 extern void _bfd_elf_link_hash_table_free
1884 extern void _bfd_elf_link_hash_copy_indirect
1885 (struct bfd_link_info *, struct elf_link_hash_entry *,
1886 struct elf_link_hash_entry *);
1887 extern void _bfd_elf_link_hash_hide_symbol
1888 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1889 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1890 (struct bfd_link_info *, struct elf_link_hash_entry *);
1891 extern bfd_boolean _bfd_elf_link_hash_table_init
1892 (struct elf_link_hash_table *, bfd *,
1893 struct bfd_hash_entry *(*)
1894 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1895 unsigned int, enum elf_target_id);
1896 extern bfd_boolean _bfd_elf_slurp_version_tables
1897 (bfd *, bfd_boolean);
1898 extern bfd_boolean _bfd_elf_merge_sections
1899 (bfd *, struct bfd_link_info *);
1900 extern bfd_boolean _bfd_elf_match_sections_by_type
1901 (bfd *, const asection *, bfd *, const asection *);
1902 extern bfd_boolean bfd_elf_is_group_section
1903 (bfd *, const struct bfd_section *);
1904 extern bfd_boolean _bfd_elf_section_already_linked
1905 (bfd *, asection *, struct bfd_link_info *);
1906 extern void bfd_elf_set_group_contents
1907 (bfd *, asection *, void *);
1908 extern asection *_bfd_elf_check_kept_section
1909 (asection *, struct bfd_link_info *);
1910 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
1911 extern void _bfd_elf_copy_link_hash_symbol_type
1912 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1913 extern bfd_boolean _bfd_elf_size_group_sections
1914 (struct bfd_link_info *);
1915 extern bfd_boolean _bfd_elf_fixup_group_sections
1916 (bfd *, asection *);
1917 extern bfd_boolean _bfd_elf_copy_private_header_data
1919 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1920 (bfd *, asymbol *, bfd *, asymbol *);
1921 #define _bfd_generic_init_private_section_data \
1922 _bfd_elf_init_private_section_data
1923 extern bfd_boolean _bfd_elf_init_private_section_data
1924 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1925 extern bfd_boolean _bfd_elf_copy_private_section_data
1926 (bfd *, asection *, bfd *, asection *);
1927 extern bfd_boolean _bfd_elf_write_object_contents
1929 extern bfd_boolean _bfd_elf_write_corefile_contents
1931 extern bfd_boolean _bfd_elf_set_section_contents
1932 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1933 extern long _bfd_elf_get_symtab_upper_bound
1935 extern long _bfd_elf_canonicalize_symtab
1936 (bfd *, asymbol **);
1937 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1939 extern long _bfd_elf_canonicalize_dynamic_symtab
1940 (bfd *, asymbol **);
1941 extern long _bfd_elf_get_synthetic_symtab
1942 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1943 extern long _bfd_elf_get_reloc_upper_bound
1945 extern long _bfd_elf_canonicalize_reloc
1946 (bfd *, sec_ptr, arelent **, asymbol **);
1947 extern asection * _bfd_elf_get_dynamic_reloc_section
1948 (bfd *, asection *, bfd_boolean);
1949 extern asection * _bfd_elf_make_dynamic_reloc_section
1950 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1951 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1953 extern long _bfd_elf_canonicalize_dynamic_reloc
1954 (bfd *, arelent **, asymbol **);
1955 extern asymbol *_bfd_elf_make_empty_symbol
1957 extern void _bfd_elf_get_symbol_info
1958 (bfd *, asymbol *, symbol_info *);
1959 extern bfd_boolean _bfd_elf_is_local_label_name
1960 (bfd *, const char *);
1961 extern alent *_bfd_elf_get_lineno
1963 extern bfd_boolean _bfd_elf_set_arch_mach
1964 (bfd *, enum bfd_architecture, unsigned long);
1965 extern bfd_boolean _bfd_elf_find_nearest_line
1966 (bfd *, asymbol **, asection *, bfd_vma,
1967 const char **, const char **, unsigned int *, unsigned int *);
1968 extern bfd_boolean _bfd_elf_find_line
1969 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1970 extern bfd_boolean _bfd_elf_find_inliner_info
1971 (bfd *, const char **, const char **, unsigned int *);
1972 extern bfd_boolean _bfd_elf_find_function
1973 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **);
1974 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1975 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1976 extern int _bfd_elf_sizeof_headers
1977 (bfd *, struct bfd_link_info *);
1978 extern bfd_boolean _bfd_elf_new_section_hook
1979 (bfd *, asection *);
1980 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1981 (const char *, const struct bfd_elf_special_section *, unsigned int);
1982 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1983 (bfd *, asection *);
1985 /* If the target doesn't have reloc handling written yet: */
1986 extern void _bfd_elf_no_info_to_howto
1987 (bfd *, arelent *, Elf_Internal_Rela *);
1989 extern bfd_boolean bfd_section_from_shdr
1990 (bfd *, unsigned int shindex);
1991 extern bfd_boolean bfd_section_from_phdr
1992 (bfd *, Elf_Internal_Phdr *, int);
1994 extern int _bfd_elf_symbol_from_bfd_symbol
1995 (bfd *, asymbol **);
1997 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
1998 (struct sym_cache *, bfd *, unsigned long);
1999 extern asection *bfd_section_from_elf_index
2000 (bfd *, unsigned int);
2002 extern struct elf_strtab_hash * _bfd_elf_strtab_init
2004 extern void _bfd_elf_strtab_free
2005 (struct elf_strtab_hash *);
2006 extern bfd_size_type _bfd_elf_strtab_add
2007 (struct elf_strtab_hash *, const char *, bfd_boolean);
2008 extern void _bfd_elf_strtab_addref
2009 (struct elf_strtab_hash *, bfd_size_type);
2010 extern void _bfd_elf_strtab_delref
2011 (struct elf_strtab_hash *, bfd_size_type);
2012 extern unsigned int _bfd_elf_strtab_refcount
2013 (struct elf_strtab_hash *, bfd_size_type);
2014 extern void _bfd_elf_strtab_clear_all_refs
2015 (struct elf_strtab_hash *tab);
2016 extern void _bfd_elf_strtab_restore_size
2017 (struct elf_strtab_hash *, bfd_size_type);
2018 extern bfd_size_type _bfd_elf_strtab_size
2019 (struct elf_strtab_hash *);
2020 extern bfd_size_type _bfd_elf_strtab_offset
2021 (struct elf_strtab_hash *, bfd_size_type);
2022 extern bfd_boolean _bfd_elf_strtab_emit
2023 (bfd *, struct elf_strtab_hash *);
2024 extern void _bfd_elf_strtab_finalize
2025 (struct elf_strtab_hash *);
2027 extern bfd_boolean bfd_elf_parse_eh_frame_entries
2028 (bfd *, struct bfd_link_info *);
2029 extern bfd_boolean _bfd_elf_parse_eh_frame_entry
2030 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2031 extern void _bfd_elf_parse_eh_frame
2032 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2033 extern bfd_boolean _bfd_elf_end_eh_frame_parsing
2034 (struct bfd_link_info *info);
2036 extern bfd_boolean _bfd_elf_discard_section_eh_frame
2037 (bfd *, struct bfd_link_info *, asection *,
2038 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
2039 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
2040 (bfd *, struct bfd_link_info *);
2041 extern bfd_vma _bfd_elf_eh_frame_section_offset
2042 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2043 extern bfd_boolean _bfd_elf_write_section_eh_frame
2044 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2045 bfd_boolean _bfd_elf_write_section_eh_frame_entry
2046 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2047 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *);
2048 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
2049 (bfd *, struct bfd_link_info *);
2050 extern bfd_boolean _bfd_elf_eh_frame_present
2051 (struct bfd_link_info *);
2052 extern bfd_boolean _bfd_elf_eh_frame_entry_present
2053 (struct bfd_link_info *);
2054 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
2055 (struct bfd_link_info *);
2057 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
2059 extern long _bfd_elf_link_lookup_local_dynindx
2060 (struct bfd_link_info *, bfd *, long);
2061 extern bfd_boolean _bfd_elf_compute_section_file_positions
2062 (bfd *, struct bfd_link_info *);
2063 extern file_ptr _bfd_elf_assign_file_position_for_section
2064 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
2066 extern bfd_boolean _bfd_elf_validate_reloc
2069 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
2070 (bfd *, struct bfd_link_info *);
2071 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
2072 (bfd *, struct bfd_link_info *, asection *);
2073 extern bfd_boolean _bfd_elf_create_dynamic_sections
2074 (bfd *, struct bfd_link_info *);
2075 extern bfd_boolean _bfd_elf_create_got_section
2076 (bfd *, struct bfd_link_info *);
2077 extern asection *_bfd_elf_section_for_symbol
2078 (struct elf_reloc_cookie *, unsigned long, bfd_boolean);
2079 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2080 (bfd *, struct bfd_link_info *, asection *, const char *);
2081 extern void _bfd_elf_init_1_index_section
2082 (bfd *, struct bfd_link_info *);
2083 extern void _bfd_elf_init_2_index_sections
2084 (bfd *, struct bfd_link_info *);
2086 extern bfd_boolean _bfd_elfcore_make_pseudosection
2087 (bfd *, char *, size_t, ufile_ptr);
2088 extern char *_bfd_elfcore_strndup
2089 (bfd *, char *, size_t);
2091 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2092 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2094 extern bfd_boolean _bfd_elf_link_output_relocs
2095 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2096 struct elf_link_hash_entry **);
2098 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2099 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *);
2101 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2102 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2104 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2105 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2107 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2108 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2110 extern bfd_boolean _bfd_elf_setup_sections
2113 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *);
2115 extern const bfd_target *bfd_elf32_object_p
2117 extern const bfd_target *bfd_elf32_core_file_p
2119 extern char *bfd_elf32_core_file_failing_command
2121 extern int bfd_elf32_core_file_failing_signal
2123 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2125 extern int bfd_elf32_core_file_pid
2128 extern bfd_boolean bfd_elf32_swap_symbol_in
2129 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2130 extern void bfd_elf32_swap_symbol_out
2131 (bfd *, const Elf_Internal_Sym *, void *, void *);
2132 extern void bfd_elf32_swap_reloc_in
2133 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2134 extern void bfd_elf32_swap_reloc_out
2135 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2136 extern void bfd_elf32_swap_reloca_in
2137 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2138 extern void bfd_elf32_swap_reloca_out
2139 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2140 extern void bfd_elf32_swap_phdr_in
2141 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2142 extern void bfd_elf32_swap_phdr_out
2143 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2144 extern void bfd_elf32_swap_dyn_in
2145 (bfd *, const void *, Elf_Internal_Dyn *);
2146 extern void bfd_elf32_swap_dyn_out
2147 (bfd *, const Elf_Internal_Dyn *, void *);
2148 extern long bfd_elf32_slurp_symbol_table
2149 (bfd *, asymbol **, bfd_boolean);
2150 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2152 extern int bfd_elf32_write_out_phdrs
2153 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2154 extern bfd_boolean bfd_elf32_checksum_contents
2155 (bfd * , void (*) (const void *, size_t, void *), void *);
2156 extern void bfd_elf32_write_relocs
2157 (bfd *, asection *, void *);
2158 extern bfd_boolean bfd_elf32_slurp_reloc_table
2159 (bfd *, asection *, asymbol **, bfd_boolean);
2161 extern const bfd_target *bfd_elf64_object_p
2163 extern const bfd_target *bfd_elf64_core_file_p
2165 extern char *bfd_elf64_core_file_failing_command
2167 extern int bfd_elf64_core_file_failing_signal
2169 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2171 extern int bfd_elf64_core_file_pid
2174 extern bfd_boolean bfd_elf64_swap_symbol_in
2175 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2176 extern void bfd_elf64_swap_symbol_out
2177 (bfd *, const Elf_Internal_Sym *, void *, void *);
2178 extern void bfd_elf64_swap_reloc_in
2179 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2180 extern void bfd_elf64_swap_reloc_out
2181 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2182 extern void bfd_elf64_swap_reloca_in
2183 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2184 extern void bfd_elf64_swap_reloca_out
2185 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2186 extern void bfd_elf64_swap_phdr_in
2187 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2188 extern void bfd_elf64_swap_phdr_out
2189 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2190 extern void bfd_elf64_swap_dyn_in
2191 (bfd *, const void *, Elf_Internal_Dyn *);
2192 extern void bfd_elf64_swap_dyn_out
2193 (bfd *, const Elf_Internal_Dyn *, void *);
2194 extern long bfd_elf64_slurp_symbol_table
2195 (bfd *, asymbol **, bfd_boolean);
2196 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2198 extern int bfd_elf64_write_out_phdrs
2199 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2200 extern bfd_boolean bfd_elf64_checksum_contents
2201 (bfd * , void (*) (const void *, size_t, void *), void *);
2202 extern void bfd_elf64_write_relocs
2203 (bfd *, asection *, void *);
2204 extern bfd_boolean bfd_elf64_slurp_reloc_table
2205 (bfd *, asection *, asymbol **, bfd_boolean);
2207 extern bfd_boolean _bfd_elf_default_relocs_compatible
2208 (const bfd_target *, const bfd_target *);
2210 extern bfd_boolean _bfd_elf_relocs_compatible
2211 (const bfd_target *, const bfd_target *);
2212 extern bfd_boolean _bfd_elf_notice_as_needed
2213 (bfd *, struct bfd_link_info *, enum notice_asneeded_action);
2215 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2216 (bfd *, struct bfd_link_info *, const char *);
2217 extern bfd_boolean bfd_elf_link_add_symbols
2218 (bfd *, struct bfd_link_info *);
2219 extern bfd_boolean _bfd_elf_add_dynamic_entry
2220 (struct bfd_link_info *, bfd_vma, bfd_vma);
2222 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2223 (struct bfd_link_info *, struct elf_link_hash_entry *);
2225 extern int bfd_elf_link_record_local_dynamic_symbol
2226 (struct bfd_link_info *, bfd *, long);
2228 extern bfd_boolean _bfd_elf_close_and_cleanup
2231 extern bfd_boolean _bfd_elf_common_definition
2232 (Elf_Internal_Sym *);
2234 extern unsigned int _bfd_elf_common_section_index
2237 extern asection *_bfd_elf_common_section
2240 extern bfd_vma _bfd_elf_default_got_elt_size
2241 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2244 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2245 (bfd *, arelent *, struct bfd_symbol *, void *,
2246 asection *, bfd *, char **);
2248 extern bfd_boolean bfd_elf_final_link
2249 (bfd *, struct bfd_link_info *);
2251 extern void _bfd_elf_gc_keep
2252 (struct bfd_link_info *info);
2254 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2255 (struct elf_link_hash_entry *h, void *inf);
2257 extern bfd_boolean bfd_elf_gc_sections
2258 (bfd *, struct bfd_link_info *);
2260 extern bfd_boolean bfd_elf_gc_record_vtinherit
2261 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2263 extern bfd_boolean bfd_elf_gc_record_vtentry
2264 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2266 extern asection *_bfd_elf_gc_mark_hook
2267 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2268 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2270 extern asection *_bfd_elf_gc_mark_rsec
2271 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2272 struct elf_reloc_cookie *);
2274 extern bfd_boolean _bfd_elf_gc_mark_reloc
2275 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2276 struct elf_reloc_cookie *);
2278 extern bfd_boolean _bfd_elf_gc_mark_fdes
2279 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2280 struct elf_reloc_cookie *);
2282 extern bfd_boolean _bfd_elf_gc_mark
2283 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2285 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2286 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2288 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2289 (bfd *, struct bfd_link_info *);
2291 extern bfd_boolean bfd_elf_gc_common_final_link
2292 (bfd *, struct bfd_link_info *);
2294 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2297 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2298 (bfd *, asection *);
2300 extern bfd_boolean _bfd_elf_map_sections_to_segments
2301 (bfd *, struct bfd_link_info *);
2303 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2305 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2308 extern asection *_bfd_elf_get_reloc_section (asection *);
2310 extern int bfd_elf_get_default_section_type (flagword);
2312 extern bfd_boolean bfd_elf_lookup_section_flags
2313 (struct bfd_link_info *, struct flag_info *, asection *);
2315 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2316 (bfd * abfd, asection * section);
2318 /* Exported interface for writing elf corefile notes. */
2319 extern char *elfcore_write_note
2320 (bfd *, char *, int *, const char *, int, const void *, int);
2321 extern char *elfcore_write_prpsinfo
2322 (bfd *, char *, int *, const char *, const char *);
2323 extern char *elfcore_write_prstatus
2324 (bfd *, char *, int *, long, int, const void *);
2325 extern char * elfcore_write_pstatus
2326 (bfd *, char *, int *, long, int, const void *);
2327 extern char *elfcore_write_prfpreg
2328 (bfd *, char *, int *, const void *, int);
2329 extern char *elfcore_write_prxfpreg
2330 (bfd *, char *, int *, const void *, int);
2331 extern char *elfcore_write_xstatereg
2332 (bfd *, char *, int *, const void *, int);
2333 extern char *elfcore_write_ppc_vmx
2334 (bfd *, char *, int *, const void *, int);
2335 extern char *elfcore_write_ppc_vsx
2336 (bfd *, char *, int *, const void *, int);
2337 extern char *elfcore_write_s390_timer
2338 (bfd *, char *, int *, const void *, int);
2339 extern char *elfcore_write_s390_todcmp
2340 (bfd *, char *, int *, const void *, int);
2341 extern char *elfcore_write_s390_todpreg
2342 (bfd *, char *, int *, const void *, int);
2343 extern char *elfcore_write_s390_ctrs
2344 (bfd *, char *, int *, const void *, int);
2345 extern char *elfcore_write_s390_prefix
2346 (bfd *, char *, int *, const void *, int);
2347 extern char *elfcore_write_s390_last_break
2348 (bfd *, char *, int *, const void *, int);
2349 extern char *elfcore_write_s390_system_call
2350 (bfd *, char *, int *, const void *, int);
2351 extern char *elfcore_write_s390_tdb
2352 (bfd *, char *, int *, const void *, int);
2353 extern char *elfcore_write_s390_vxrs_low
2354 (bfd *, char *, int *, const void *, int);
2355 extern char *elfcore_write_s390_vxrs_high
2356 (bfd *, char *, int *, const void *, int);
2357 extern char *elfcore_write_arm_vfp
2358 (bfd *, char *, int *, const void *, int);
2359 extern char *elfcore_write_aarch_tls
2360 (bfd *, char *, int *, const void *, int);
2361 extern char *elfcore_write_aarch_hw_break
2362 (bfd *, char *, int *, const void *, int);
2363 extern char *elfcore_write_aarch_hw_watch
2364 (bfd *, char *, int *, const void *, int);
2365 extern char *elfcore_write_lwpstatus
2366 (bfd *, char *, int *, long, int, const void *);
2367 extern char *elfcore_write_register_note
2368 (bfd *, char *, int *, const char *, const void *, int);
2370 /* Internal structure which holds information to be included in the
2371 PRPSINFO section of Linux core files.
2373 This is an "internal" structure in the sense that it should be used
2374 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2375 function), so things like endianess shouldn't be an issue. This
2376 structure will eventually be converted in one of the
2377 `elf_external_linux_*' structures and written out to an output bfd
2378 by one of the functions declared below. */
2380 struct elf_internal_linux_prpsinfo
2382 char pr_state; /* Numeric process state. */
2383 char pr_sname; /* Char for pr_state. */
2384 char pr_zomb; /* Zombie. */
2385 char pr_nice; /* Nice val. */
2386 unsigned long pr_flag; /* Flags. */
2387 unsigned int pr_uid;
2388 unsigned int pr_gid;
2389 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2390 char pr_fname[16 + 1]; /* Filename of executable. */
2391 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2394 /* Linux/most 32-bit archs. */
2395 extern char *elfcore_write_linux_prpsinfo32
2396 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2398 /* Linux/most 64-bit archs. */
2399 extern char *elfcore_write_linux_prpsinfo64
2400 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2402 /* Linux/PPC32 uses different layout compared to most archs. */
2403 extern char *elfcore_write_ppc_linux_prpsinfo32
2404 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2406 extern bfd *_bfd_elf32_bfd_from_remote_memory
2407 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2408 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2409 extern bfd *_bfd_elf64_bfd_from_remote_memory
2410 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2411 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2413 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2414 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2415 extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int);
2416 extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int);
2417 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2418 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2419 extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *);
2420 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2421 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2422 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int,
2423 unsigned int, const char *);
2424 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2425 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2428 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2429 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2430 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int);
2431 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2432 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2433 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2434 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2435 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2437 /* The linker may need to keep track of the number of relocs that it
2438 decides to copy as dynamic relocs in check_relocs for each symbol.
2439 This is so that it can later discard them if they are found to be
2440 unnecessary. We can store the information in a field extending the
2441 regular ELF linker hash table. */
2443 struct elf_dyn_relocs
2445 struct elf_dyn_relocs *next;
2447 /* The input section of the reloc. */
2450 /* Total number of relocs copied for the input section. */
2451 bfd_size_type count;
2453 /* Number of pc-relative relocs copied for the input section. */
2454 bfd_size_type pc_count;
2457 extern bfd_boolean _bfd_elf_create_ifunc_sections
2458 (bfd *, struct bfd_link_info *);
2459 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2460 (struct bfd_link_info *, struct elf_link_hash_entry *,
2461 struct elf_dyn_relocs **, unsigned int, unsigned int, unsigned int);
2462 extern long _bfd_elf_ifunc_get_synthetic_symtab
2463 (bfd *, long, asymbol **, long, asymbol **, asymbol **, asection *,
2464 bfd_vma *(*) (bfd *, asymbol **, asection *, asection *));
2466 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2467 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2469 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2470 extern bfd_vma elf64_r_sym (bfd_vma);
2471 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2472 extern bfd_vma elf32_r_sym (bfd_vma);
2474 /* Large common section. */
2475 extern asection _bfd_elf_large_com_section;
2477 /* Hash for local symbol with the first section id, ID, in the input
2478 file and the local symbol index, SYM. */
2479 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2480 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2481 ^ (SYM) ^ ((ID) >> 16))
2483 /* This is the condition under which finish_dynamic_symbol will be called.
2484 If our finish_dynamic_symbol isn't called, we'll need to do something
2485 about initializing any .plt and .got entries in relocate_section. */
2486 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2488 && ((SHARED) || !(H)->forced_local) \
2489 && ((H)->dynindx != -1 || (H)->forced_local))
2491 /* This macro is to avoid lots of duplicated code in the body
2492 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2493 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2494 r_symndx, symtab_hdr, sym_hashes, \
2495 h, sec, relocation, \
2496 unresolved_reloc, warned, ignored) \
2499 /* It seems this can happen with erroneous or unsupported \
2500 input (mixing a.out and elf in an archive, for example.) */ \
2501 if (sym_hashes == NULL) \
2504 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2506 if (info->wrap_hash != NULL \
2507 && (input_section->flags & SEC_DEBUGGING) != 0) \
2508 h = ((struct elf_link_hash_entry *) \
2509 unwrap_hash_lookup (info, input_bfd, &h->root)); \
2511 while (h->root.type == bfd_link_hash_indirect \
2512 || h->root.type == bfd_link_hash_warning) \
2513 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2517 unresolved_reloc = FALSE; \
2519 if (h->root.type == bfd_link_hash_defined \
2520 || h->root.type == bfd_link_hash_defweak) \
2522 sec = h->root.u.def.section; \
2524 || sec->output_section == NULL) \
2525 /* Set a flag that will be cleared later if we find a \
2526 relocation value for this symbol. output_section \
2527 is typically NULL for symbols satisfied by a shared \
2529 unresolved_reloc = TRUE; \
2531 relocation = (h->root.u.def.value \
2532 + sec->output_section->vma \
2533 + sec->output_offset); \
2535 else if (h->root.type == bfd_link_hash_undefweak) \
2537 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2538 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2540 else if (!info->relocatable) \
2543 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2544 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2545 if (!info->callbacks->undefined_symbol (info, \
2546 h->root.root.string, \
2549 rel->r_offset, err)) \
2553 (void) unresolved_reloc; \
2559 /* This macro is to avoid lots of duplicated code in the body of the
2560 loop over relocations in xxx_relocate_section() in the various
2563 Handle relocations against symbols from removed linkonce sections,
2564 or sections discarded by a linker script. When doing a relocatable
2565 link, we remove such relocations. Otherwise, we just want the
2566 section contents zeroed and avoid any special processing. */
2567 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2568 rel, count, relend, \
2569 howto, index, contents) \
2572 _bfd_clear_contents (howto, input_bfd, input_section, \
2573 contents + rel[index].r_offset); \
2575 if (info->relocatable \
2576 && (input_section->flags & SEC_DEBUGGING)) \
2578 /* Only remove relocations in debug sections since other \
2579 sections may require relocations. */ \
2580 Elf_Internal_Shdr *rel_hdr; \
2582 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2584 /* Avoid empty output section. */ \
2585 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2587 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2588 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2589 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2591 memmove (rel, rel + count, \
2592 (relend - rel - count) * sizeof (*rel)); \
2594 input_section->reloc_count--; \
2601 for (i_ = 0; i_ < count; i_++) \
2603 rel[i_].r_info = 0; \
2604 rel[i_].r_addend = 0; \
2610 /* Will a symbol be bound to the definition within the shared
2611 library, if any. A unique symbol can never be bound locally. */
2612 #define SYMBOLIC_BIND(INFO, H) \
2613 (!(H)->unique_global \
2614 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2619 #endif /* _LIBELF_H_ */