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 symbol version. */
112 enum elf_symbol_version
120 /* ELF linker hash table entries. */
122 struct elf_link_hash_entry
124 struct bfd_link_hash_entry root;
126 /* Symbol index in output file. This is initialized to -1. It is
127 set to -2 if the symbol is used by a reloc. */
130 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
131 -1 if this is not a dynamic symbol. */
132 /* ??? Note that this is consistently used as a synonym for tests
133 against whether we can perform various simplifying transformations
134 to the code. (E.g. changing a pc-relative jump to a PLT entry
135 into a pc-relative jump to the target function.) That test, which
136 is often relatively complex, and someplaces wrong or incomplete,
137 should really be replaced by a predicate in elflink.c.
139 End result: this field -1 does not indicate that the symbol is
140 not in the dynamic symbol table, but rather that the symbol is
141 not visible outside this DSO. */
144 /* If this symbol requires an entry in the global offset table, the
145 processor specific backend uses this field to track usage and
146 final offset. Two schemes are supported: The first assumes that
147 a symbol may only have one GOT entry, and uses REFCOUNT until
148 size_dynamic_sections, at which point the contents of the .got is
149 fixed. Afterward, if OFFSET is -1, then the symbol does not
150 require a global offset table entry. The second scheme allows
151 multiple GOT entries per symbol, managed via a linked list
152 pointed to by GLIST. */
153 union gotplt_union got;
155 /* Same, but tracks a procedure linkage table entry. */
156 union gotplt_union plt;
161 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
162 unsigned int type : 8;
164 /* Symbol st_other value, symbol visibility. */
165 unsigned int other : 8;
167 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */
168 unsigned int target_internal : 8;
170 /* Symbol is referenced by a non-shared object (other than the object
171 in which it is defined). */
172 unsigned int ref_regular : 1;
173 /* Symbol is defined by a non-shared object. */
174 unsigned int def_regular : 1;
175 /* Symbol is referenced by a shared object. */
176 unsigned int ref_dynamic : 1;
177 /* Symbol is defined by a shared object. */
178 unsigned int def_dynamic : 1;
179 /* Symbol has a non-weak reference from a non-shared object (other than
180 the object in which it is defined). */
181 unsigned int ref_regular_nonweak : 1;
182 /* Dynamic symbol has been adjustd. */
183 unsigned int dynamic_adjusted : 1;
184 /* Symbol needs a copy reloc. */
185 unsigned int needs_copy : 1;
186 /* Symbol needs a procedure linkage table entry. */
187 unsigned int needs_plt : 1;
188 /* Symbol appears in a non-ELF input file. */
189 unsigned int non_elf : 1;
190 /* Symbol version information. */
191 ENUM_BITFIELD (elf_symbol_version) versioned : 2;
192 /* Symbol was forced to local scope due to a version script file. */
193 unsigned int forced_local : 1;
194 /* Symbol was forced to be dynamic due to a version script file. */
195 unsigned int dynamic : 1;
196 /* Symbol was marked during garbage collection. */
197 unsigned int mark : 1;
198 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
199 not currently set by all the backends. */
200 unsigned int non_got_ref : 1;
201 /* Symbol has a definition in a shared object.
202 FIXME: There is no real need for this field if def_dynamic is never
203 cleared and all places that test def_dynamic also test def_regular. */
204 unsigned int dynamic_def : 1;
205 /* Symbol has a non-weak reference from a shared object. */
206 unsigned int ref_dynamic_nonweak : 1;
207 /* Symbol is referenced with a relocation where C/C++ pointer equality
209 unsigned int pointer_equality_needed : 1;
210 /* Symbol is a unique global symbol. */
211 unsigned int unique_global : 1;
212 /* Symbol is defined by a shared library with non-default visibility
213 in a read/write section. */
214 unsigned int protected_def : 1;
216 /* String table index in .dynstr if this is a dynamic symbol. */
217 unsigned long dynstr_index;
221 /* If this is a weak defined symbol from a dynamic object, this
222 field points to a defined symbol with the same value, if there is
223 one. Otherwise it is NULL. */
224 struct elf_link_hash_entry *weakdef;
226 /* Hash value of the name computed using the ELF hash function.
227 Used part way through size_dynamic_sections, after we've finished
229 unsigned long elf_hash_value;
232 /* Version information. */
235 /* This field is used for a symbol which is not defined in a
236 regular object. It points to the version information read in
237 from the dynamic object. */
238 Elf_Internal_Verdef *verdef;
239 /* This field is used for a symbol which is defined in a regular
240 object. It is set up in size_dynamic_sections. It points to
241 the version information we should write out for this symbol. */
242 struct bfd_elf_version_tree *vertree;
245 struct elf_link_virtual_table_entry *vtable;
248 /* Will references to this symbol always reference the symbol
250 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
251 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
253 /* Will _calls_ to this symbol always call the version in this object? */
254 #define SYMBOL_CALLS_LOCAL(INFO, H) \
255 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
257 /* Common symbols that are turned into definitions don't have the
258 DEF_REGULAR flag set, so they might appear to be undefined.
259 Symbols defined in linker scripts also don't have DEF_REGULAR set. */
260 #define ELF_COMMON_DEF_P(H) \
262 && !(H)->def_dynamic \
263 && (H)->root.type == bfd_link_hash_defined)
265 /* Records local symbols to be emitted in the dynamic symbol table. */
267 struct elf_link_local_dynamic_entry
269 struct elf_link_local_dynamic_entry *next;
271 /* The input bfd this symbol came from. */
274 /* The index of the local symbol being copied. */
277 /* The index in the outgoing dynamic symbol table. */
280 /* A copy of the input symbol. */
281 Elf_Internal_Sym isym;
284 struct elf_link_loaded_list
286 struct elf_link_loaded_list *next;
290 /* Structures used by the eh_frame optimization code. */
295 /* If REMOVED == 1, this is the CIE that the FDE originally used.
296 The CIE belongs to the same .eh_frame input section as the FDE.
298 If REMOVED == 0, this is the CIE that we have chosen to use for
299 the output FDE. The CIE's REMOVED field is also 0, but the CIE
300 might belong to a different .eh_frame input section from the FDE.
302 May be NULL to signify that the FDE should be discarded. */
303 struct eh_cie_fde *cie_inf;
304 struct eh_cie_fde *next_for_section;
307 /* CIEs have three states:
309 - REMOVED && !MERGED: Slated for removal because we haven't yet
310 proven that an FDE needs it. FULL_CIE, if nonnull, points to
311 more detailed information about the CIE.
313 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
314 which may not belong to the same input section.
316 - !REMOVED: We have decided to keep this CIE. SEC is the
317 .eh_frame input section that contains the CIE. */
319 struct cie *full_cie;
320 struct eh_cie_fde *merged_with;
324 /* The offset of the personality data from the start of the CIE,
325 or 0 if the CIE doesn't have any. */
326 unsigned int personality_offset : 8;
328 /* True if we have marked relocations associated with this CIE. */
329 unsigned int gc_mark : 1;
331 /* True if we have decided to turn an absolute LSDA encoding into
332 a PC-relative one. */
333 unsigned int make_lsda_relative : 1;
335 /* True if we have decided to turn an absolute personality
336 encoding into a PC-relative one. */
337 unsigned int make_per_encoding_relative : 1;
339 /* True if the CIE contains personality data and if that
340 data uses a PC-relative encoding. Always true when
341 make_per_encoding_relative is. */
342 unsigned int per_encoding_relative : 1;
344 /* True if we need to add an 'R' (FDE encoding) entry to the
345 CIE's augmentation data. */
346 unsigned int add_fde_encoding : 1;
348 /* True if we have merged this CIE with another. */
349 unsigned int merged : 1;
352 unsigned int pad1 : 18;
355 unsigned int reloc_index;
358 unsigned int new_offset;
359 unsigned int fde_encoding : 8;
360 unsigned int lsda_encoding : 8;
361 unsigned int lsda_offset : 8;
363 /* True if this entry represents a CIE, false if it represents an FDE. */
364 unsigned int cie : 1;
366 /* True if this entry is currently marked for removal. */
367 unsigned int removed : 1;
369 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
370 augmentation data, and an associated byte to each of the CIE's FDEs. */
371 unsigned int add_augmentation_size : 1;
373 /* True if we have decided to convert absolute FDE relocations into
374 relative ones. This applies to the first relocation in the FDE,
375 which is against the code that the FDE describes. */
376 unsigned int make_relative : 1;
379 unsigned int pad1 : 4;
381 unsigned int *set_loc;
384 struct eh_frame_sec_info
388 struct eh_cie_fde entry[1];
391 struct eh_frame_array_ent
400 #define DWARF2_EH_HDR 1
401 #define COMPACT_EH_HDR 2
403 /* Endian-neutral code indicating that a function cannot be unwound. */
404 #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01
406 struct dwarf_eh_frame_hdr_info
409 unsigned int fde_count;
410 /* TRUE if .eh_frame_hdr should contain the sorted search table.
411 We build it if we successfully read all .eh_frame input sections
412 and recognize them. */
414 struct eh_frame_array_ent *array;
417 struct compact_eh_frame_hdr_info
419 unsigned int allocated_entries;
420 /* eh_frame_entry fragments. */
424 struct eh_frame_hdr_info
427 unsigned int array_count;
428 bfd_boolean frame_hdr_is_compact;
431 struct dwarf_eh_frame_hdr_info dwarf;
432 struct compact_eh_frame_hdr_info compact;
437 /* Enum used to identify target specific extensions to the elf_obj_tdata
438 and elf_link_hash_table structures. Note the enums deliberately start
439 from 1 so that we can detect an uninitialized field. The generic value
440 is last so that additions to this enum do not need to modify more than
444 AARCH64_ELF_DATA = 1,
481 struct elf_sym_strtab
483 Elf_Internal_Sym sym;
484 unsigned long dest_index;
485 unsigned long destshndx_index;
488 /* ELF linker hash table. */
490 struct elf_link_hash_table
492 struct bfd_link_hash_table root;
494 /* An identifier used to distinguish different target
495 specific extensions to this structure. */
496 enum elf_target_id hash_table_id;
498 /* Whether we have created the special dynamic sections required
499 when linking against or generating a shared object. */
500 bfd_boolean dynamic_sections_created;
502 /* True if this target has relocatable executables, so needs dynamic
504 bfd_boolean is_relocatable_executable;
506 /* The BFD used to hold special sections created by the linker.
507 This will be the first BFD found which requires these sections to
511 /* The value to use when initialising got.refcount/offset and
512 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
513 the values are refcounts. Set to init_got_offset/init_plt_offset
514 in size_dynamic_sections when the values may be offsets. */
515 union gotplt_union init_got_refcount;
516 union gotplt_union init_plt_refcount;
518 /* The value to use for got.refcount/offset and plt.refcount/offset
519 when the values may be offsets. Normally (bfd_vma) -1. */
520 union gotplt_union init_got_offset;
521 union gotplt_union init_plt_offset;
523 /* The number of symbols found in the link which must be put into
524 the .dynsym section. */
525 bfd_size_type dynsymcount;
527 /* The string table of dynamic symbols, which becomes the .dynstr
529 struct elf_strtab_hash *dynstr;
531 /* The number of symbol strings found in the link which must be put
532 into the .strtab section. */
533 bfd_size_type strtabcount;
535 /* The array size of the symbol string table, which becomes the
537 bfd_size_type strtabsize;
539 /* The array of strings, which becomes the .strtab section. */
540 struct elf_sym_strtab *strtab;
542 /* The number of buckets in the hash table in the .hash section.
543 This is based on the number of dynamic symbols. */
544 bfd_size_type bucketcount;
546 /* A linked list of DT_NEEDED names found in dynamic objects
547 included in the link. */
548 struct bfd_link_needed_list *needed;
550 /* Sections in the output bfd that provides a section symbol
551 to be used by relocations emitted against local symbols.
552 Most targets will not use data_index_section. */
553 asection *text_index_section;
554 asection *data_index_section;
556 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
557 struct elf_link_hash_entry *hgot;
559 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
560 struct elf_link_hash_entry *hplt;
562 /* The _DYNAMIC symbol. */
563 struct elf_link_hash_entry *hdynamic;
565 /* A pointer to information used to merge SEC_MERGE sections. */
568 /* Used to link stabs in sections. */
569 struct stab_info stab_info;
571 /* Used by eh_frame code when editing .eh_frame. */
572 struct eh_frame_hdr_info eh_info;
574 /* A linked list of local symbols to be added to .dynsym. */
575 struct elf_link_local_dynamic_entry *dynlocal;
577 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
578 objects included in the link. */
579 struct bfd_link_needed_list *runpath;
581 /* Cached first output tls section and size of PT_TLS segment. */
583 bfd_size_type tls_size;
585 /* A linked list of BFD's loaded in the link. */
586 struct elf_link_loaded_list *loaded;
588 /* Short-cuts to get to dynamic linker sections. */
601 /* Look up an entry in an ELF linker hash table. */
603 #define elf_link_hash_lookup(table, string, create, copy, follow) \
604 ((struct elf_link_hash_entry *) \
605 bfd_link_hash_lookup (&(table)->root, (string), (create), \
608 /* Traverse an ELF linker hash table. */
610 #define elf_link_hash_traverse(table, func, info) \
611 (bfd_link_hash_traverse \
613 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
616 /* Get the ELF linker hash table from a link_info structure. */
618 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
620 #define elf_hash_table_id(table) ((table) -> hash_table_id)
622 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
623 #define is_elf_hash_table(htab) \
624 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
626 /* Used by bfd_sym_from_r_symndx to cache a small number of local
628 #define LOCAL_SYM_CACHE_SIZE 32
632 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
633 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
636 /* Constant information held for an ELF backend. */
638 struct elf_size_info {
639 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
640 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
642 /* The size of entries in the .hash section. */
643 unsigned char sizeof_hash_entry;
645 /* The number of internal relocations to allocate per external
647 unsigned char int_rels_per_ext_rel;
648 /* We use some fixed size arrays. This should be large enough to
649 handle all back-ends. */
650 #define MAX_INT_RELS_PER_EXT_REL 3
652 unsigned char arch_size, log_file_align;
653 unsigned char elfclass, ev_current;
654 int (*write_out_phdrs)
655 (bfd *, const Elf_Internal_Phdr *, unsigned int);
657 (*write_shdrs_and_ehdr) (bfd *);
658 bfd_boolean (*checksum_contents)
659 (bfd * , void (*) (const void *, size_t, void *), void *);
661 (bfd *, asection *, void *);
662 bfd_boolean (*swap_symbol_in)
663 (bfd *, const void *, const void *, Elf_Internal_Sym *);
664 void (*swap_symbol_out)
665 (bfd *, const Elf_Internal_Sym *, void *, void *);
666 bfd_boolean (*slurp_reloc_table)
667 (bfd *, asection *, asymbol **, bfd_boolean);
668 long (*slurp_symbol_table)
669 (bfd *, asymbol **, bfd_boolean);
671 (bfd *, const void *, Elf_Internal_Dyn *);
673 (bfd *, const Elf_Internal_Dyn *, void *);
675 /* This function is called to swap in a REL 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_reloc_in)
679 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
681 /* This function is called to swap out a REL relocation. */
682 void (*swap_reloc_out)
683 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
685 /* This function is called to swap in a RELA relocation. If an
686 external relocation corresponds to more than one internal
687 relocation, then all relocations are swapped in at once. */
688 void (*swap_reloca_in)
689 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
691 /* This function is called to swap out a RELA relocation. */
692 void (*swap_reloca_out)
693 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
696 #define elf_symbol_from(ABFD,S) \
697 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
698 && (S)->the_bfd->tdata.elf_obj_data != 0) \
699 ? (elf_symbol_type *) (S) \
702 enum elf_reloc_type_class {
704 reloc_class_relative,
710 struct elf_reloc_cookie
712 Elf_Internal_Rela *rels, *rel, *relend;
713 Elf_Internal_Sym *locsyms;
717 struct elf_link_hash_entry **sym_hashes;
719 bfd_boolean bad_symtab;
722 /* The level of IRIX compatibility we're striving for. */
730 /* Mapping of ELF section names and types. */
731 struct bfd_elf_special_section
735 /* 0 means name must match PREFIX exactly.
736 -1 means name must start with PREFIX followed by an arbitrary string.
737 -2 means name must match PREFIX exactly or consist of PREFIX followed
738 by a dot then anything.
739 > 0 means name must start with the first PREFIX_LENGTH chars of
740 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
746 enum action_discarded
752 typedef asection * (*elf_gc_mark_hook_fn)
753 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
754 struct elf_link_hash_entry *, Elf_Internal_Sym *);
756 struct elf_backend_data
758 /* The architecture for this backend. */
759 enum bfd_architecture arch;
761 /* An identifier used to distinguish different target specific
762 extensions to elf_obj_tdata and elf_link_hash_table structures. */
763 enum elf_target_id target_id;
765 /* The ELF machine code (EM_xxxx) for this backend. */
766 int elf_machine_code;
771 /* The maximum page size for this backend. */
774 /* The minimum page size for this backend. An input object will not be
775 considered page aligned unless its sections are correctly aligned for
776 pages at least this large. May be smaller than maxpagesize. */
779 /* The common page size for this backend. */
780 bfd_vma commonpagesize;
782 /* The BFD flags applied to sections created for dynamic linking. */
783 flagword dynamic_sec_flags;
785 /* Architecture-specific data for this backend.
786 This is actually a pointer to some type like struct elf_ARCH_data. */
787 const void *arch_data;
789 /* A function to translate an ELF RELA relocation to a BFD arelent
791 void (*elf_info_to_howto)
792 (bfd *, arelent *, Elf_Internal_Rela *);
794 /* A function to translate an ELF REL relocation to a BFD arelent
796 void (*elf_info_to_howto_rel)
797 (bfd *, arelent *, Elf_Internal_Rela *);
799 /* A function to determine whether a symbol is global when
800 partitioning the symbol table into local and global symbols.
801 This should be NULL for most targets, in which case the correct
802 thing will be done. MIPS ELF, at least on the Irix 5, has
803 special requirements. */
804 bfd_boolean (*elf_backend_sym_is_global)
807 /* The remaining functions are hooks which are called only if they
810 /* A function to permit a backend specific check on whether a
811 particular BFD format is relevant for an object file, and to
812 permit the backend to set any global information it wishes. When
813 this is called elf_elfheader is set, but anything else should be
814 used with caution. If this returns FALSE, the check_format
815 routine will return a bfd_error_wrong_format error. */
816 bfd_boolean (*elf_backend_object_p)
819 /* A function to do additional symbol processing when reading the
820 ELF symbol table. This is where any processor-specific special
821 section indices are handled. */
822 void (*elf_backend_symbol_processing)
825 /* A function to do additional symbol processing after reading the
826 entire ELF symbol table. */
827 bfd_boolean (*elf_backend_symbol_table_processing)
828 (bfd *, elf_symbol_type *, unsigned int);
830 /* A function to set the type of the info field. Processor-specific
831 types should be handled here. */
832 int (*elf_backend_get_symbol_type)
833 (Elf_Internal_Sym *, int);
835 /* A function to return the linker hash table entry of a symbol that
836 might be satisfied by an archive symbol. */
837 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
838 (bfd *, struct bfd_link_info *, const char *);
840 /* Return true if local section symbols should have a non-null st_name.
841 NULL implies false. */
842 bfd_boolean (*elf_backend_name_local_section_symbols)
845 /* A function to do additional processing on the ELF section header
846 just before writing it out. This is used to set the flags and
847 type fields for some sections, or to actually write out data for
849 bfd_boolean (*elf_backend_section_processing)
850 (bfd *, Elf_Internal_Shdr *);
852 /* A function to handle unusual section types when creating BFD
853 sections from ELF sections. */
854 bfd_boolean (*elf_backend_section_from_shdr)
855 (bfd *, Elf_Internal_Shdr *, const char *, int);
857 /* A function to convert machine dependent ELF section header flags to
858 BFD internal section header flags. */
859 bfd_boolean (*elf_backend_section_flags)
860 (flagword *, const Elf_Internal_Shdr *);
862 /* A function that returns a struct containing ELF section flags and
863 type for the given BFD section. */
864 const struct bfd_elf_special_section * (*get_sec_type_attr)
867 /* A function to handle unusual program segment types when creating BFD
868 sections from ELF program segments. */
869 bfd_boolean (*elf_backend_section_from_phdr)
870 (bfd *, Elf_Internal_Phdr *, int, const char *);
872 /* A function to set up the ELF section header for a BFD section in
873 preparation for writing it out. This is where the flags and type
874 fields are set for unusual sections. */
875 bfd_boolean (*elf_backend_fake_sections)
876 (bfd *, Elf_Internal_Shdr *, asection *);
878 /* A function to get the ELF section index for a BFD section. If
879 this returns TRUE, the section was found. If it is a normal ELF
880 section, *RETVAL should be left unchanged. If it is not a normal
881 ELF section *RETVAL should be set to the SHN_xxxx index. */
882 bfd_boolean (*elf_backend_section_from_bfd_section)
883 (bfd *, asection *, int *retval);
885 /* If this field is not NULL, it is called by the add_symbols phase
886 of a link just before adding a symbol to the global linker hash
887 table. It may modify any of the fields as it wishes. If *NAME
888 is set to NULL, the symbol will be skipped rather than being
889 added to the hash table. This function is responsible for
890 handling all processor dependent symbol bindings and section
891 indices, and must set at least *FLAGS and *SEC for each processor
892 dependent case; failure to do so will cause a link error. */
893 bfd_boolean (*elf_add_symbol_hook)
894 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
895 const char **name, flagword *flags, asection **sec, bfd_vma *value);
897 /* If this field is not NULL, it is called by the elf_link_output_sym
898 phase of a link for each symbol which will appear in the object file.
899 On error, this function returns 0. 1 is returned when the symbol
900 should be output, 2 is returned when the symbol should be discarded. */
901 int (*elf_backend_link_output_symbol_hook)
902 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
903 asection *, struct elf_link_hash_entry *);
905 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
906 linker the first time it encounters a dynamic object in the link.
907 This function must create any sections required for dynamic
908 linking. The ABFD argument is a dynamic object. The .interp,
909 .dynamic, .dynsym, .dynstr, and .hash functions have already been
910 created, and this function may modify the section flags if
911 desired. This function will normally create the .got and .plt
912 sections, but different backends have different requirements. */
913 bfd_boolean (*elf_backend_create_dynamic_sections)
914 (bfd *abfd, struct bfd_link_info *info);
916 /* When creating a shared library, determine whether to omit the
917 dynamic symbol for the section. */
918 bfd_boolean (*elf_backend_omit_section_dynsym)
919 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
921 /* Return TRUE if relocations of targets are compatible to the extent
922 that CHECK_RELOCS will properly process them. PR 4424. */
923 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
925 /* The CHECK_RELOCS function is called by the add_symbols phase of
926 the ELF backend linker. It is called once for each section with
927 relocs of an object file, just after the symbols for the object
928 file have been added to the global linker hash table. The
929 function must look through the relocs and do any special handling
930 required. This generally means allocating space in the global
931 offset table, and perhaps allocating space for a reloc. The
932 relocs are always passed as Rela structures; if the section
933 actually uses Rel structures, the r_addend field will always be
935 bfd_boolean (*check_relocs)
936 (bfd *abfd, struct bfd_link_info *info, asection *o,
937 const Elf_Internal_Rela *relocs);
939 /* The CHECK_DIRECTIVES function is called once per input file by
940 the add_symbols phase of the ELF backend linker. The function
941 must inspect the bfd and create any additional symbols according
942 to any custom directives in the bfd. */
943 bfd_boolean (*check_directives)
944 (bfd *abfd, struct bfd_link_info *info);
946 /* The NOTICE_AS_NEEDED function is called as the linker is about to
947 handle an as-needed lib (ACT = notice_as_needed), and after the
948 linker has decided to keep the lib (ACT = notice_needed) or when
949 the lib is not needed (ACT = notice_not_needed). */
950 bfd_boolean (*notice_as_needed)
951 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act);
953 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
954 linker for every symbol which is defined by a dynamic object and
955 referenced by a regular object. This is called after all the
956 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
957 function has been called. The hash table entry should be
958 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
959 defined in a section from a dynamic object. Dynamic object
960 sections are not included in the final link, and this function is
961 responsible for changing the value to something which the rest of
962 the link can deal with. This will normally involve adding an
963 entry to the .plt or .got or some such section, and setting the
964 symbol to point to that. */
965 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
966 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
968 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
969 after all the linker input files have been seen but before the
970 section sizes have been set. This is called after
971 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
972 bfd_boolean (*elf_backend_always_size_sections)
973 (bfd *output_bfd, struct bfd_link_info *info);
975 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
976 linker after all the linker input files have been seen but before
977 the sections sizes have been set. This is called after
978 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
979 It is only called when linking against a dynamic object. It must
980 set the sizes of the dynamic sections, and may fill in their
981 contents as well. The generic ELF linker can handle the .dynsym,
982 .dynstr and .hash sections. This function must handle the
983 .interp section and any sections created by the
984 CREATE_DYNAMIC_SECTIONS entry point. */
985 bfd_boolean (*elf_backend_size_dynamic_sections)
986 (bfd *output_bfd, struct bfd_link_info *info);
988 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
989 we keep to use as a base for relocs and symbols. */
990 void (*elf_backend_init_index_section)
991 (bfd *output_bfd, struct bfd_link_info *info);
993 /* The RELOCATE_SECTION function is called by the ELF backend linker
994 to handle the relocations for a section.
996 The relocs are always passed as Rela structures; if the section
997 actually uses Rel structures, the r_addend field will always be
1000 This function is responsible for adjust the section contents as
1001 necessary, and (if using Rela relocs and generating a
1002 relocatable output file) adjusting the reloc addend as
1005 This function does not have to worry about setting the reloc
1006 address or the reloc symbol index.
1008 LOCAL_SYMS is a pointer to the swapped in local symbols.
1010 LOCAL_SECTIONS is an array giving the section in the input file
1011 corresponding to the st_shndx field of each local symbol.
1013 The global hash table entry for the global symbols can be found
1014 via elf_sym_hashes (input_bfd).
1016 When generating relocatable output, this function must handle
1017 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1018 going to be the section symbol corresponding to the output
1019 section, which means that the addend must be adjusted
1022 Returns FALSE on error, TRUE on success, 2 if successful and
1023 relocations should be written for this section. */
1024 int (*elf_backend_relocate_section)
1025 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
1026 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
1027 Elf_Internal_Sym *local_syms, asection **local_sections);
1029 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
1030 linker just before it writes a symbol out to the .dynsym section.
1031 The processor backend may make any required adjustment to the
1032 symbol. It may also take the opportunity to set contents of the
1033 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
1034 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
1035 on those symbols which are defined by a dynamic object. */
1036 bfd_boolean (*elf_backend_finish_dynamic_symbol)
1037 (bfd *output_bfd, struct bfd_link_info *info,
1038 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
1040 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
1041 linker just before it writes all the dynamic sections out to the
1042 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
1043 all dynamic symbols. */
1044 bfd_boolean (*elf_backend_finish_dynamic_sections)
1045 (bfd *output_bfd, struct bfd_link_info *info);
1047 /* A function to do any beginning processing needed for the ELF file
1048 before building the ELF headers and computing file positions. */
1049 void (*elf_backend_begin_write_processing)
1050 (bfd *, struct bfd_link_info *);
1052 /* A function to do any final processing needed for the ELF file
1053 before writing it out. The LINKER argument is TRUE if this BFD
1054 was created by the ELF backend linker. */
1055 void (*elf_backend_final_write_processing)
1056 (bfd *, bfd_boolean linker);
1058 /* This function is called by get_program_header_size. It should
1059 return the number of additional program segments which this BFD
1060 will need. It should return -1 on error. */
1061 int (*elf_backend_additional_program_headers)
1062 (bfd *, struct bfd_link_info *);
1064 /* This function is called to modify an existing segment map in a
1065 backend specific fashion. */
1066 bfd_boolean (*elf_backend_modify_segment_map)
1067 (bfd *, struct bfd_link_info *);
1069 /* This function is called to modify program headers just before
1070 they are written. */
1071 bfd_boolean (*elf_backend_modify_program_headers)
1072 (bfd *, struct bfd_link_info *);
1074 /* This function is called before section garbage collection to
1075 mark entry symbol sections. */
1077 (struct bfd_link_info *);
1079 /* This function is called during section garbage collection to
1080 mark sections that define global symbols. */
1081 bfd_boolean (*gc_mark_dynamic_ref)
1082 (struct elf_link_hash_entry *, void *);
1084 /* This function is called during section gc to discover the section a
1085 particular relocation refers to. */
1086 elf_gc_mark_hook_fn gc_mark_hook;
1088 /* This function, if defined, is called after the first gc marking pass
1089 to allow the backend to mark additional sections. */
1090 bfd_boolean (*gc_mark_extra_sections)
1091 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1093 /* This function, if defined, is called during the sweep phase of gc
1094 in order that a backend might update any data structures it might
1096 bfd_boolean (*gc_sweep_hook)
1097 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1099 /* This function, if defined, is called after the ELF headers have
1100 been created. This allows for things like the OS and ABI versions
1102 void (*elf_backend_post_process_headers)
1103 (bfd *, struct bfd_link_info *);
1105 /* This function, if defined, prints a symbol to file and returns the
1106 name of the symbol to be printed. It should return NULL to fall
1107 back to default symbol printing. */
1108 const char *(*elf_backend_print_symbol_all)
1109 (bfd *, void *, asymbol *);
1111 /* This function, if defined, is called after all local symbols and
1112 global symbols converted to locals are emitted into the symtab
1113 section. It allows the backend to emit special local symbols
1114 not handled in the hash table. */
1115 bfd_boolean (*elf_backend_output_arch_local_syms)
1116 (bfd *, struct bfd_link_info *, void *,
1117 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1118 struct elf_link_hash_entry *));
1120 /* This function, if defined, is called after all symbols are emitted
1121 into the symtab section. It allows the backend to emit special
1122 global symbols not handled in the hash table. */
1123 bfd_boolean (*elf_backend_output_arch_syms)
1124 (bfd *, struct bfd_link_info *, void *,
1125 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1126 struct elf_link_hash_entry *));
1128 /* Copy any information related to dynamic linking from a pre-existing
1129 symbol to a newly created symbol. Also called to copy flags and
1130 other back-end info to a weakdef, in which case the symbol is not
1131 newly created and plt/got refcounts and dynamic indices should not
1133 void (*elf_backend_copy_indirect_symbol)
1134 (struct bfd_link_info *, struct elf_link_hash_entry *,
1135 struct elf_link_hash_entry *);
1137 /* Modify any information related to dynamic linking such that the
1138 symbol is not exported. */
1139 void (*elf_backend_hide_symbol)
1140 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1142 /* A function to do additional symbol fixup, called by
1143 _bfd_elf_fix_symbol_flags. */
1144 bfd_boolean (*elf_backend_fixup_symbol)
1145 (struct bfd_link_info *, struct elf_link_hash_entry *);
1147 /* Merge the backend specific symbol attribute. */
1148 void (*elf_backend_merge_symbol_attribute)
1149 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1152 /* This function, if defined, will return a string containing the
1153 name of a target-specific dynamic tag. */
1154 char *(*elf_backend_get_target_dtag)
1157 /* Decide whether an undefined symbol is special and can be ignored.
1158 This is the case for OPTIONAL symbols on IRIX. */
1159 bfd_boolean (*elf_backend_ignore_undef_symbol)
1160 (struct elf_link_hash_entry *);
1162 /* Emit relocations. Overrides default routine for emitting relocs,
1163 except during a relocatable link, or if all relocs are being emitted. */
1164 bfd_boolean (*elf_backend_emit_relocs)
1165 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1166 struct elf_link_hash_entry **);
1168 /* Count relocations. Not called for relocatable links
1169 or if all relocs are being preserved in the output. */
1170 unsigned int (*elf_backend_count_relocs)
1171 (struct bfd_link_info *, asection *);
1173 /* Say whether to sort relocs output by ld -r and ld --emit-relocs,
1174 by r_offset. If NULL, default to true. */
1175 bfd_boolean (*sort_relocs_p)
1178 /* This function, if defined, is called when an NT_PRSTATUS note is found
1180 bfd_boolean (*elf_backend_grok_prstatus)
1181 (bfd *, Elf_Internal_Note *);
1183 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1184 note is found in a core file. */
1185 bfd_boolean (*elf_backend_grok_psinfo)
1186 (bfd *, Elf_Internal_Note *);
1188 /* This function, if defined, is called to write a note to a corefile. */
1189 char *(*elf_backend_write_core_note)
1190 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1192 /* This function, if defined, is called to convert target-specific
1193 section flag names into hex values. */
1194 flagword (*elf_backend_lookup_section_flags_hook)
1197 /* This function returns class of a reloc type. */
1198 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1199 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *);
1201 /* This function, if defined, removes information about discarded functions
1202 from other sections which mention them. */
1203 bfd_boolean (*elf_backend_discard_info)
1204 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1206 /* This function, if defined, signals that the function above has removed
1207 the discarded relocations for this section. */
1208 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1211 /* What to do when ld finds relocations against symbols defined in
1212 discarded sections. */
1213 unsigned int (*action_discarded)
1216 /* This function returns the width of FDE pointers in bytes, or 0 if
1217 that can't be determined for some reason. The default definition
1218 goes by the bfd's EI_CLASS. */
1219 unsigned int (*elf_backend_eh_frame_address_size)
1220 (bfd *, asection *);
1222 /* These functions tell elf-eh-frame whether to attempt to turn
1223 absolute or lsda encodings into pc-relative ones. The default
1224 definition enables these transformations. */
1225 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1226 (bfd *, struct bfd_link_info *, asection *);
1227 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1228 (bfd *, struct bfd_link_info *, asection *);
1230 /* This function returns an encoding after computing the encoded
1231 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1232 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1233 The default definition chooses a 32-bit PC-relative encoding. */
1234 bfd_byte (*elf_backend_encode_eh_address)
1235 (bfd *abfd, struct bfd_link_info *info,
1236 asection *osec, bfd_vma offset,
1237 asection *loc_sec, bfd_vma loc_offset,
1240 /* This function, if defined, may write out the given section.
1241 Returns TRUE if it did so and FALSE if the caller should. */
1242 bfd_boolean (*elf_backend_write_section)
1243 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1245 /* The level of IRIX compatibility we're striving for.
1246 MIPS ELF specific function. */
1247 irix_compat_t (*elf_backend_mips_irix_compat)
1250 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1251 (unsigned int, bfd_boolean);
1253 /* The swapping table to use when dealing with ECOFF information.
1254 Used for the MIPS ELF .mdebug section. */
1255 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1257 /* This function implements `bfd_elf_bfd_from_remote_memory';
1258 see elf.c, elfcode.h. */
1259 bfd *(*elf_backend_bfd_from_remote_memory)
1260 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
1261 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1262 bfd_size_type len));
1264 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1266 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1268 /* Is symbol defined in common section? */
1269 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1271 /* Return a common section index for section. */
1272 unsigned int (*common_section_index) (asection *);
1274 /* Return a common section for section. */
1275 asection *(*common_section) (asection *);
1277 /* Return TRUE if we can merge 2 definitions. */
1278 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *,
1279 const Elf_Internal_Sym *, asection **,
1280 bfd_boolean, bfd_boolean,
1281 bfd *, const asection *);
1283 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1284 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1286 /* Return TRUE if type is a function symbol type. */
1287 bfd_boolean (*is_function_type) (unsigned int type);
1289 /* If the ELF symbol SYM might be a function in SEC, return the
1290 function size and set *CODE_OFF to the function's entry point,
1291 otherwise return zero. */
1292 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1295 /* Return the section which RELOC_SEC applies to. */
1296 asection *(*get_reloc_section) (asection *reloc_sec);
1298 /* Used to handle bad SHF_LINK_ORDER input. */
1299 bfd_error_handler_type link_order_error_handler;
1301 /* Name of the PLT relocation section. */
1302 const char *relplt_name;
1304 /* Alternate EM_xxxx machine codes for this backend. */
1305 int elf_machine_alt1;
1306 int elf_machine_alt2;
1308 const struct elf_size_info *s;
1310 /* An array of target specific special sections. */
1311 const struct bfd_elf_special_section *special_sections;
1313 /* The size in bytes of the header for the GOT. This includes the
1314 so-called reserved entries on some systems. */
1315 bfd_vma got_header_size;
1317 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1318 otherwise by the local symbol with index SYMNDX in IBFD. */
1319 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1320 struct elf_link_hash_entry *h,
1321 bfd *ibfd, unsigned long symndx);
1323 /* The vendor name to use for a processor-standard attributes section. */
1324 const char *obj_attrs_vendor;
1326 /* The section name to use for a processor-standard attributes section. */
1327 const char *obj_attrs_section;
1329 /* Return 1, 2 or 3 to indicate what type of arguments a
1330 processor-specific tag takes. */
1331 int (*obj_attrs_arg_type) (int);
1333 /* The section type to use for an attributes section. */
1334 unsigned int obj_attrs_section_type;
1336 /* This function determines the order in which any attributes are
1337 written. It must be defined for input in the range
1338 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1339 is used in order to make unity easy). The returned value is the
1340 actual tag number to place in the input position. */
1341 int (*obj_attrs_order) (int);
1343 /* Handle merging unknown attributes; either warn and return TRUE,
1344 or give an error and return FALSE. */
1345 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1347 /* Encoding used for compact EH tables. */
1348 int (*compact_eh_encoding) (struct bfd_link_info *);
1350 /* Opcode representing no unwind. */
1351 int (*cant_unwind_opcode) (struct bfd_link_info *);
1353 /* This is non-zero if static TLS segments require a special alignment. */
1354 unsigned static_tls_alignment;
1356 /* Alignment for the PT_GNU_STACK segment. */
1357 unsigned stack_align;
1359 /* This is TRUE if the linker should act like collect and gather
1360 global constructors and destructors by name. This is TRUE for
1361 MIPS ELF because the Irix 5 tools can not handle the .init
1363 unsigned collect : 1;
1365 /* This is TRUE if the linker should ignore changes to the type of a
1366 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1367 record undefined functions as STT_OBJECT although the definitions
1369 unsigned type_change_ok : 1;
1371 /* Whether the backend may use REL relocations. (Some backends use
1372 both REL and RELA relocations, and this flag is set for those
1374 unsigned may_use_rel_p : 1;
1376 /* Whether the backend may use RELA relocations. (Some backends use
1377 both REL and RELA relocations, and this flag is set for those
1379 unsigned may_use_rela_p : 1;
1381 /* Whether the default relocation type is RELA. If a backend with
1382 this flag set wants REL relocations for a particular section,
1383 it must note that explicitly. Similarly, if this flag is clear,
1384 and the backend wants RELA relocations for a particular
1386 unsigned default_use_rela_p : 1;
1388 /* True if PLT and copy relocations should be RELA by default. */
1389 unsigned rela_plts_and_copies_p : 1;
1391 /* Set if RELA relocations for a relocatable link can be handled by
1392 generic code. Backends that set this flag need do nothing in the
1393 backend relocate_section routine for relocatable linking. */
1394 unsigned rela_normal : 1;
1396 /* TRUE if addresses "naturally" sign extend. This is used when
1397 swapping in from Elf32 when BFD64. */
1398 unsigned sign_extend_vma : 1;
1400 unsigned want_got_plt : 1;
1401 unsigned plt_readonly : 1;
1402 unsigned want_plt_sym : 1;
1403 unsigned plt_not_loaded : 1;
1404 unsigned plt_alignment : 4;
1405 unsigned can_gc_sections : 1;
1406 unsigned can_refcount : 1;
1407 unsigned want_got_sym : 1;
1408 unsigned want_dynbss : 1;
1410 /* Targets which do not support physical addressing often require
1411 that the p_paddr field in the section header to be set to zero.
1412 This field indicates whether this behavior is required. */
1413 unsigned want_p_paddr_set_to_zero : 1;
1415 /* True if an object file lacking a .note.GNU-stack section
1416 should be assumed to be requesting exec stack. At least one
1417 other file in the link needs to have a .note.GNU-stack section
1418 for a PT_GNU_STACK segment to be created. */
1419 unsigned default_execstack : 1;
1421 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize
1422 in length rather than sec->size in length, if sec->rawsize is
1423 non-zero and smaller than sec->size. */
1424 unsigned caches_rawsize : 1;
1426 /* Address of protected data defined in the shared library may be
1427 external, i.e., due to copy relocation. */
1428 unsigned extern_protected_data : 1;
1431 /* Information about reloc sections associated with a bfd_elf_section_data
1433 struct bfd_elf_section_reloc_data
1435 /* The ELF header for the reloc section associated with this
1437 Elf_Internal_Shdr *hdr;
1438 /* The number of relocations currently assigned to HDR. */
1440 /* The ELF section number of the reloc section. Only used for an
1443 /* Used by the backend linker to store the symbol hash table entries
1444 associated with relocs against global symbols. */
1445 struct elf_link_hash_entry **hashes;
1448 /* Information stored for each BFD section in an ELF file. This
1449 structure is allocated by elf_new_section_hook. */
1451 struct bfd_elf_section_data
1453 /* The ELF header for this section. */
1454 Elf_Internal_Shdr this_hdr;
1456 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1457 struct flag_info *section_flag_info;
1459 /* Information about the REL and RELA reloc sections associated
1460 with this section, if any. */
1461 struct bfd_elf_section_reloc_data rel, rela;
1463 /* The ELF section number of this section. */
1466 /* Used by the backend linker when generating a shared library to
1467 record the dynamic symbol index for a section symbol
1468 corresponding to this section. A value of 0 means that there is
1469 no dynamic symbol for this section. */
1472 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1473 asection *linked_to;
1475 /* A pointer to the swapped relocs. If the section uses REL relocs,
1476 rather than RELA, all the r_addend fields will be zero. This
1477 pointer may be NULL. It is used by the backend linker. */
1478 Elf_Internal_Rela *relocs;
1480 /* A pointer to a linked list tracking dynamic relocs copied for
1484 /* A pointer to the bfd section used for dynamic relocs. */
1488 /* Group name, if this section is a member of a group. */
1491 /* Group signature sym, if this is the SHT_GROUP section. */
1492 struct bfd_symbol *id;
1495 /* For a member of a group, points to the SHT_GROUP section.
1496 NULL for the SHT_GROUP section itself and non-group sections. */
1497 asection *sec_group;
1499 /* A linked list of member sections in the group. Circular when used by
1500 the linker. For the SHT_GROUP section, points at first member. */
1501 asection *next_in_group;
1503 /* The FDEs associated with this section. The u.fde.next_in_section
1504 field acts as a chain pointer. */
1505 struct eh_cie_fde *fde_list;
1507 /* Link from a text section to its .eh_frame_entry section. */
1508 asection *eh_frame_entry;
1510 /* A pointer used for various section optimizations. */
1514 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1515 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1516 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1517 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1518 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1519 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1520 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1521 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1522 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1523 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry)
1525 #define xvec_get_elf_backend_data(xvec) \
1526 ((const struct elf_backend_data *) (xvec)->backend_data)
1528 #define get_elf_backend_data(abfd) \
1529 xvec_get_elf_backend_data ((abfd)->xvec)
1531 /* The least object attributes (within an attributes subsection) known
1532 for any target. Some code assumes that the value 0 is not used and
1533 the field for that attribute can instead be used as a marker to
1534 indicate that attributes have been initialized. */
1535 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1537 /* The maximum number of known object attributes for any target. */
1538 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1540 /* The value of an object attribute. The type indicates whether the attribute
1541 holds and integer, a string, or both. It can also indicate that there can
1542 be no default (i.e. all values must be written to file, even zero). */
1544 typedef struct obj_attribute
1546 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1547 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1548 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1550 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1551 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1552 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1559 typedef struct obj_attribute_list
1561 struct obj_attribute_list *next;
1564 } obj_attribute_list;
1566 /* Object attributes may either be defined by the processor ABI, index
1567 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1568 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1569 #define OBJ_ATTR_PROC 0
1570 #define OBJ_ATTR_GNU 1
1571 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1572 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1574 /* The following object attribute tags are taken as generic, for all
1575 targets and for "gnu" where there is no target standard. */
1582 Tag_compatibility = 32
1585 /* The following struct stores information about every SystemTap section
1586 found in the object file. */
1589 struct sdt_note *next;
1594 /* tdata information grabbed from an elf core file. */
1595 struct core_elf_obj_tdata
1604 /* Extra tdata information held for output ELF BFDs. */
1605 struct output_elf_obj_tdata
1607 struct elf_segment_map *seg_map;
1608 struct elf_strtab_hash *strtab_ptr;
1610 /* STT_SECTION symbols for each section */
1611 asymbol **section_syms;
1613 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1615 asection *eh_frame_hdr;
1617 /* NT_GNU_BUILD_ID note type info. */
1620 bfd_boolean (*after_write_object_contents) (bfd *);
1625 /* Records the result of `get_program_header_size'. */
1626 bfd_size_type program_header_size;
1628 /* Used when laying out sections. */
1629 file_ptr next_file_pos;
1631 int num_section_syms;
1632 unsigned int shstrtab_section, strtab_section;
1634 /* Segment flags for the PT_GNU_STACK segment. */
1635 unsigned int stack_flags;
1637 /* This is set to TRUE if the object was created by the backend
1641 /* Used to determine if the e_flags field has been initialized */
1642 bfd_boolean flags_init;
1645 /* Indicate if the bfd contains symbols that have the STT_GNU_IFUNC
1646 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1647 field in the ELF header structure. */
1648 enum elf_gnu_symbols
1650 elf_gnu_symbol_none = 0,
1651 elf_gnu_symbol_any = 1 << 0,
1652 elf_gnu_symbol_ifunc = (elf_gnu_symbol_any | 1 << 1),
1653 elf_gnu_symbol_unique = (elf_gnu_symbol_any | 1 << 2),
1654 elf_gnu_symbol_all = (elf_gnu_symbol_ifunc | elf_gnu_symbol_unique)
1657 typedef struct elf_section_list
1659 Elf_Internal_Shdr hdr;
1661 struct elf_section_list * next;
1665 /* Some private data is stashed away for future use using the tdata pointer
1666 in the bfd structure. */
1668 struct elf_obj_tdata
1670 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1671 Elf_Internal_Shdr **elf_sect_ptr;
1672 Elf_Internal_Phdr *phdr;
1673 Elf_Internal_Shdr symtab_hdr;
1674 Elf_Internal_Shdr shstrtab_hdr;
1675 Elf_Internal_Shdr strtab_hdr;
1676 Elf_Internal_Shdr dynsymtab_hdr;
1677 Elf_Internal_Shdr dynstrtab_hdr;
1678 Elf_Internal_Shdr dynversym_hdr;
1679 Elf_Internal_Shdr dynverref_hdr;
1680 Elf_Internal_Shdr dynverdef_hdr;
1681 elf_section_list * symtab_shndx_list;
1682 bfd_vma gp; /* The gp value */
1683 unsigned int gp_size; /* The gp size */
1684 unsigned int num_elf_sections; /* elf_sect_ptr size */
1686 /* A mapping from external symbols to entries in the linker hash
1687 table, used when linking. This is indexed by the symbol index
1688 minus the sh_info field of the symbol table header. */
1689 struct elf_link_hash_entry **sym_hashes;
1691 /* Track usage and final offsets of GOT entries for local symbols.
1692 This array is indexed by symbol index. Elements are used
1693 identically to "got" in struct elf_link_hash_entry. */
1696 bfd_signed_vma *refcounts;
1698 struct got_entry **ents;
1701 /* The linker ELF emulation code needs to let the backend ELF linker
1702 know what filename should be used for a dynamic object if the
1703 dynamic object is found using a search. The emulation code then
1704 sometimes needs to know what name was actually used. Until the
1705 file has been added to the linker symbol table, this field holds
1706 the name the linker wants. After it has been added, it holds the
1707 name actually used, which will be the DT_SONAME entry if there is
1709 const char *dt_name;
1711 /* The linker emulation needs to know what audit libs
1712 are used by a dynamic object. */
1713 const char *dt_audit;
1715 /* Used by find_nearest_line entry point. */
1718 /* A place to stash dwarf1 info for this bfd. */
1719 struct dwarf1_debug *dwarf1_find_line_info;
1721 /* A place to stash dwarf2 info for this bfd. */
1722 void *dwarf2_find_line_info;
1724 /* Stash away info for yet another find line/function variant. */
1725 void *elf_find_function_cache;
1727 /* Number of symbol version definitions we are about to emit. */
1728 unsigned int cverdefs;
1730 /* Number of symbol version references we are about to emit. */
1731 unsigned int cverrefs;
1733 /* Symbol version definitions in external objects. */
1734 Elf_Internal_Verdef *verdef;
1736 /* Symbol version references to external objects. */
1737 Elf_Internal_Verneed *verref;
1739 /* A pointer to the .eh_frame section. */
1740 asection *eh_frame_section;
1742 /* Symbol buffer. */
1745 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1746 obj_attribute_list *other_obj_attributes[2];
1748 /* Linked-list containing information about every Systemtap section
1749 found in the object file. Each section corresponds to one entry
1751 struct sdt_note *sdt_note_head;
1753 Elf_Internal_Shdr **group_sect_ptr;
1756 unsigned int symtab_section, dynsymtab_section;
1757 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1759 /* An identifier used to distinguish different target
1760 specific extensions to this structure. */
1761 enum elf_target_id object_id;
1763 /* Whether a dyanmic object was specified normally on the linker
1764 command line, or was specified when --as-needed was in effect,
1765 or was found via a DT_NEEDED entry. */
1766 enum dynamic_lib_link_class dyn_lib_class;
1768 /* Irix 5 often screws up the symbol table, sorting local symbols
1769 after global symbols. This flag is set if the symbol table in
1770 this BFD appears to be screwed up. If it is, we ignore the
1771 sh_info field in the symbol table header, and always read all the
1773 bfd_boolean bad_symtab;
1775 enum elf_gnu_symbols has_gnu_symbols;
1777 /* Information grabbed from an elf core file. */
1778 struct core_elf_obj_tdata *core;
1780 /* More information held for output ELF BFDs. */
1781 struct output_elf_obj_tdata *o;
1784 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1786 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1787 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size)
1788 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1789 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1790 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1791 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map)
1792 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos)
1793 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr)
1794 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker)
1795 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags)
1796 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr)
1797 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1798 #define elf_symtab_shndx_list(bfd) (elf_tdata(bfd) -> symtab_shndx_list)
1799 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section)
1800 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section)
1801 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1802 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1803 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1804 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1805 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1806 #define elf_eh_frame_section(bfd) \
1807 (elf_tdata(bfd) -> eh_frame_section)
1808 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms)
1809 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms)
1810 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1811 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1812 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1813 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1814 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1815 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1816 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1817 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1818 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1819 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1820 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1821 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1822 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init)
1823 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1824 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1825 #define elf_known_obj_attributes_proc(bfd) \
1826 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1827 #define elf_other_obj_attributes_proc(bfd) \
1828 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1830 extern void _bfd_elf_swap_verdef_in
1831 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1832 extern void _bfd_elf_swap_verdef_out
1833 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1834 extern void _bfd_elf_swap_verdaux_in
1835 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1836 extern void _bfd_elf_swap_verdaux_out
1837 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1838 extern void _bfd_elf_swap_verneed_in
1839 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1840 extern void _bfd_elf_swap_verneed_out
1841 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1842 extern void _bfd_elf_swap_vernaux_in
1843 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1844 extern void _bfd_elf_swap_vernaux_out
1845 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1846 extern void _bfd_elf_swap_versym_in
1847 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1848 extern void _bfd_elf_swap_versym_out
1849 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1851 extern unsigned int _bfd_elf_section_from_bfd_section
1852 (bfd *, asection *);
1853 extern char *bfd_elf_string_from_elf_section
1854 (bfd *, unsigned, unsigned);
1855 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1856 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1857 Elf_External_Sym_Shndx *);
1858 extern const char *bfd_elf_sym_name
1859 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1861 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1863 extern bfd_boolean _bfd_elf_print_private_bfd_data
1865 const char * _bfd_elf_get_symbol_version_string
1866 (bfd *, asymbol *, bfd_boolean *);
1867 extern void bfd_elf_print_symbol
1868 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1870 extern unsigned int _bfd_elf_eh_frame_address_size
1871 (bfd *, asection *);
1872 extern bfd_byte _bfd_elf_encode_eh_address
1873 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1874 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1875 extern bfd_boolean _bfd_elf_can_make_relative
1876 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1878 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1879 (const struct bfd_link_info *, const asection *,
1880 const Elf_Internal_Rela *);
1881 extern bfd_vma _bfd_elf_rela_local_sym
1882 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1883 extern bfd_vma _bfd_elf_rel_local_sym
1884 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1885 extern bfd_vma _bfd_elf_section_offset
1886 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1888 extern unsigned long bfd_elf_hash
1890 extern unsigned long bfd_elf_gnu_hash
1893 extern bfd_reloc_status_type bfd_elf_generic_reloc
1894 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1895 extern bfd_boolean bfd_elf_allocate_object
1896 (bfd *, size_t, enum elf_target_id);
1897 extern bfd_boolean bfd_elf_make_object
1899 extern bfd_boolean bfd_elf_mkcorefile
1901 extern bfd_boolean _bfd_elf_make_section_from_shdr
1902 (bfd *, Elf_Internal_Shdr *, const char *, int);
1903 extern bfd_boolean _bfd_elf_make_section_from_phdr
1904 (bfd *, Elf_Internal_Phdr *, int, const char *);
1905 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1906 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1907 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1909 extern void _bfd_elf_link_hash_table_free
1911 extern void _bfd_elf_link_hash_copy_indirect
1912 (struct bfd_link_info *, struct elf_link_hash_entry *,
1913 struct elf_link_hash_entry *);
1914 extern void _bfd_elf_link_hash_hide_symbol
1915 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1916 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1917 (struct bfd_link_info *, struct elf_link_hash_entry *);
1918 extern bfd_boolean _bfd_elf_link_hash_table_init
1919 (struct elf_link_hash_table *, bfd *,
1920 struct bfd_hash_entry *(*)
1921 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1922 unsigned int, enum elf_target_id);
1923 extern bfd_boolean _bfd_elf_slurp_version_tables
1924 (bfd *, bfd_boolean);
1925 extern bfd_boolean _bfd_elf_merge_sections
1926 (bfd *, struct bfd_link_info *);
1927 extern bfd_boolean _bfd_elf_match_sections_by_type
1928 (bfd *, const asection *, bfd *, const asection *);
1929 extern bfd_boolean bfd_elf_is_group_section
1930 (bfd *, const struct bfd_section *);
1931 extern bfd_boolean _bfd_elf_section_already_linked
1932 (bfd *, asection *, struct bfd_link_info *);
1933 extern void bfd_elf_set_group_contents
1934 (bfd *, asection *, void *);
1935 extern asection *_bfd_elf_check_kept_section
1936 (asection *, struct bfd_link_info *);
1937 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
1938 extern void _bfd_elf_copy_link_hash_symbol_type
1939 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1940 extern bfd_boolean _bfd_elf_size_group_sections
1941 (struct bfd_link_info *);
1942 extern bfd_boolean _bfd_elf_fixup_group_sections
1943 (bfd *, asection *);
1944 extern bfd_boolean _bfd_elf_copy_private_header_data
1946 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1947 (bfd *, asymbol *, bfd *, asymbol *);
1948 #define _bfd_generic_init_private_section_data \
1949 _bfd_elf_init_private_section_data
1950 extern bfd_boolean _bfd_elf_init_private_section_data
1951 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1952 extern bfd_boolean _bfd_elf_copy_private_section_data
1953 (bfd *, asection *, bfd *, asection *);
1954 extern bfd_boolean _bfd_elf_write_object_contents
1956 extern bfd_boolean _bfd_elf_write_corefile_contents
1958 extern bfd_boolean _bfd_elf_set_section_contents
1959 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1960 extern long _bfd_elf_get_symtab_upper_bound
1962 extern long _bfd_elf_canonicalize_symtab
1963 (bfd *, asymbol **);
1964 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1966 extern long _bfd_elf_canonicalize_dynamic_symtab
1967 (bfd *, asymbol **);
1968 extern long _bfd_elf_get_synthetic_symtab
1969 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1970 extern long _bfd_elf_get_reloc_upper_bound
1972 extern long _bfd_elf_canonicalize_reloc
1973 (bfd *, sec_ptr, arelent **, asymbol **);
1974 extern asection * _bfd_elf_get_dynamic_reloc_section
1975 (bfd *, asection *, bfd_boolean);
1976 extern asection * _bfd_elf_make_dynamic_reloc_section
1977 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1978 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1980 extern long _bfd_elf_canonicalize_dynamic_reloc
1981 (bfd *, arelent **, asymbol **);
1982 extern asymbol *_bfd_elf_make_empty_symbol
1984 extern void _bfd_elf_get_symbol_info
1985 (bfd *, asymbol *, symbol_info *);
1986 extern bfd_boolean _bfd_elf_is_local_label_name
1987 (bfd *, const char *);
1988 extern alent *_bfd_elf_get_lineno
1990 extern bfd_boolean _bfd_elf_set_arch_mach
1991 (bfd *, enum bfd_architecture, unsigned long);
1992 extern bfd_boolean _bfd_elf_find_nearest_line
1993 (bfd *, asymbol **, asection *, bfd_vma,
1994 const char **, const char **, unsigned int *, unsigned int *);
1995 extern bfd_boolean _bfd_elf_find_line
1996 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1997 extern bfd_boolean _bfd_elf_find_inliner_info
1998 (bfd *, const char **, const char **, unsigned int *);
1999 extern asymbol *_bfd_elf_find_function
2000 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **);
2001 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
2002 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
2003 extern int _bfd_elf_sizeof_headers
2004 (bfd *, struct bfd_link_info *);
2005 extern bfd_boolean _bfd_elf_new_section_hook
2006 (bfd *, asection *);
2007 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
2008 (const char *, const struct bfd_elf_special_section *, unsigned int);
2009 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
2010 (bfd *, asection *);
2012 /* If the target doesn't have reloc handling written yet: */
2013 extern void _bfd_elf_no_info_to_howto
2014 (bfd *, arelent *, Elf_Internal_Rela *);
2016 extern bfd_boolean bfd_section_from_shdr
2017 (bfd *, unsigned int shindex);
2018 extern bfd_boolean bfd_section_from_phdr
2019 (bfd *, Elf_Internal_Phdr *, int);
2021 extern int _bfd_elf_symbol_from_bfd_symbol
2022 (bfd *, asymbol **);
2024 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
2025 (struct sym_cache *, bfd *, unsigned long);
2026 extern asection *bfd_section_from_elf_index
2027 (bfd *, unsigned int);
2029 extern struct elf_strtab_hash * _bfd_elf_strtab_init
2031 extern void _bfd_elf_strtab_free
2032 (struct elf_strtab_hash *);
2033 extern bfd_size_type _bfd_elf_strtab_add
2034 (struct elf_strtab_hash *, const char *, bfd_boolean);
2035 extern void _bfd_elf_strtab_addref
2036 (struct elf_strtab_hash *, bfd_size_type);
2037 extern void _bfd_elf_strtab_delref
2038 (struct elf_strtab_hash *, bfd_size_type);
2039 extern unsigned int _bfd_elf_strtab_refcount
2040 (struct elf_strtab_hash *, bfd_size_type);
2041 extern void _bfd_elf_strtab_clear_all_refs
2042 (struct elf_strtab_hash *tab);
2043 extern void _bfd_elf_strtab_restore_size
2044 (struct elf_strtab_hash *, bfd_size_type);
2045 extern bfd_size_type _bfd_elf_strtab_size
2046 (struct elf_strtab_hash *);
2047 extern bfd_size_type _bfd_elf_strtab_offset
2048 (struct elf_strtab_hash *, bfd_size_type);
2049 extern bfd_boolean _bfd_elf_strtab_emit
2050 (bfd *, struct elf_strtab_hash *);
2051 extern void _bfd_elf_strtab_finalize
2052 (struct elf_strtab_hash *);
2054 extern bfd_boolean bfd_elf_parse_eh_frame_entries
2055 (bfd *, struct bfd_link_info *);
2056 extern bfd_boolean _bfd_elf_parse_eh_frame_entry
2057 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2058 extern void _bfd_elf_parse_eh_frame
2059 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2060 extern bfd_boolean _bfd_elf_end_eh_frame_parsing
2061 (struct bfd_link_info *info);
2063 extern bfd_boolean _bfd_elf_discard_section_eh_frame
2064 (bfd *, struct bfd_link_info *, asection *,
2065 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
2066 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
2067 (bfd *, struct bfd_link_info *);
2068 extern bfd_vma _bfd_elf_eh_frame_section_offset
2069 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2070 extern bfd_boolean _bfd_elf_write_section_eh_frame
2071 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2072 bfd_boolean _bfd_elf_write_section_eh_frame_entry
2073 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2074 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *);
2075 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
2076 (bfd *, struct bfd_link_info *);
2077 extern bfd_boolean _bfd_elf_eh_frame_present
2078 (struct bfd_link_info *);
2079 extern bfd_boolean _bfd_elf_eh_frame_entry_present
2080 (struct bfd_link_info *);
2081 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
2082 (struct bfd_link_info *);
2084 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
2086 extern long _bfd_elf_link_lookup_local_dynindx
2087 (struct bfd_link_info *, bfd *, long);
2088 extern bfd_boolean _bfd_elf_compute_section_file_positions
2089 (bfd *, struct bfd_link_info *);
2090 extern file_ptr _bfd_elf_assign_file_position_for_section
2091 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
2093 extern bfd_boolean _bfd_elf_validate_reloc
2096 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
2097 (bfd *, struct bfd_link_info *);
2098 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
2099 (bfd *, struct bfd_link_info *, asection *);
2100 extern bfd_boolean _bfd_elf_create_dynamic_sections
2101 (bfd *, struct bfd_link_info *);
2102 extern bfd_boolean _bfd_elf_create_got_section
2103 (bfd *, struct bfd_link_info *);
2104 extern asection *_bfd_elf_section_for_symbol
2105 (struct elf_reloc_cookie *, unsigned long, bfd_boolean);
2106 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2107 (bfd *, struct bfd_link_info *, asection *, const char *);
2108 extern void _bfd_elf_init_1_index_section
2109 (bfd *, struct bfd_link_info *);
2110 extern void _bfd_elf_init_2_index_sections
2111 (bfd *, struct bfd_link_info *);
2113 extern bfd_boolean _bfd_elfcore_make_pseudosection
2114 (bfd *, char *, size_t, ufile_ptr);
2115 extern char *_bfd_elfcore_strndup
2116 (bfd *, char *, size_t);
2118 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2119 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2121 extern bfd_boolean _bfd_elf_link_output_relocs
2122 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2123 struct elf_link_hash_entry **);
2125 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2126 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *);
2128 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2129 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2131 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2132 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2134 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2135 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2137 extern bfd_boolean _bfd_elf_setup_sections
2140 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *);
2142 extern const bfd_target *bfd_elf32_object_p
2144 extern const bfd_target *bfd_elf32_core_file_p
2146 extern char *bfd_elf32_core_file_failing_command
2148 extern int bfd_elf32_core_file_failing_signal
2150 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2152 extern int bfd_elf32_core_file_pid
2155 extern bfd_boolean bfd_elf32_swap_symbol_in
2156 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2157 extern void bfd_elf32_swap_symbol_out
2158 (bfd *, const Elf_Internal_Sym *, void *, void *);
2159 extern void bfd_elf32_swap_reloc_in
2160 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2161 extern void bfd_elf32_swap_reloc_out
2162 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2163 extern void bfd_elf32_swap_reloca_in
2164 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2165 extern void bfd_elf32_swap_reloca_out
2166 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2167 extern void bfd_elf32_swap_phdr_in
2168 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2169 extern void bfd_elf32_swap_phdr_out
2170 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2171 extern void bfd_elf32_swap_dyn_in
2172 (bfd *, const void *, Elf_Internal_Dyn *);
2173 extern void bfd_elf32_swap_dyn_out
2174 (bfd *, const Elf_Internal_Dyn *, void *);
2175 extern long bfd_elf32_slurp_symbol_table
2176 (bfd *, asymbol **, bfd_boolean);
2177 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2179 extern int bfd_elf32_write_out_phdrs
2180 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2181 extern bfd_boolean bfd_elf32_checksum_contents
2182 (bfd * , void (*) (const void *, size_t, void *), void *);
2183 extern void bfd_elf32_write_relocs
2184 (bfd *, asection *, void *);
2185 extern bfd_boolean bfd_elf32_slurp_reloc_table
2186 (bfd *, asection *, asymbol **, bfd_boolean);
2188 extern const bfd_target *bfd_elf64_object_p
2190 extern const bfd_target *bfd_elf64_core_file_p
2192 extern char *bfd_elf64_core_file_failing_command
2194 extern int bfd_elf64_core_file_failing_signal
2196 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2198 extern int bfd_elf64_core_file_pid
2201 extern bfd_boolean bfd_elf64_swap_symbol_in
2202 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2203 extern void bfd_elf64_swap_symbol_out
2204 (bfd *, const Elf_Internal_Sym *, void *, void *);
2205 extern void bfd_elf64_swap_reloc_in
2206 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2207 extern void bfd_elf64_swap_reloc_out
2208 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2209 extern void bfd_elf64_swap_reloca_in
2210 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2211 extern void bfd_elf64_swap_reloca_out
2212 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2213 extern void bfd_elf64_swap_phdr_in
2214 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2215 extern void bfd_elf64_swap_phdr_out
2216 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2217 extern void bfd_elf64_swap_dyn_in
2218 (bfd *, const void *, Elf_Internal_Dyn *);
2219 extern void bfd_elf64_swap_dyn_out
2220 (bfd *, const Elf_Internal_Dyn *, void *);
2221 extern long bfd_elf64_slurp_symbol_table
2222 (bfd *, asymbol **, bfd_boolean);
2223 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2225 extern int bfd_elf64_write_out_phdrs
2226 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2227 extern bfd_boolean bfd_elf64_checksum_contents
2228 (bfd * , void (*) (const void *, size_t, void *), void *);
2229 extern void bfd_elf64_write_relocs
2230 (bfd *, asection *, void *);
2231 extern bfd_boolean bfd_elf64_slurp_reloc_table
2232 (bfd *, asection *, asymbol **, bfd_boolean);
2234 extern bfd_boolean _bfd_elf_default_relocs_compatible
2235 (const bfd_target *, const bfd_target *);
2237 extern bfd_boolean _bfd_elf_relocs_compatible
2238 (const bfd_target *, const bfd_target *);
2239 extern bfd_boolean _bfd_elf_notice_as_needed
2240 (bfd *, struct bfd_link_info *, enum notice_asneeded_action);
2242 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2243 (bfd *, struct bfd_link_info *, const char *);
2244 extern bfd_boolean bfd_elf_link_add_symbols
2245 (bfd *, struct bfd_link_info *);
2246 extern bfd_boolean _bfd_elf_add_dynamic_entry
2247 (struct bfd_link_info *, bfd_vma, bfd_vma);
2249 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2250 (struct bfd_link_info *, struct elf_link_hash_entry *);
2252 extern int bfd_elf_link_record_local_dynamic_symbol
2253 (struct bfd_link_info *, bfd *, long);
2255 extern bfd_boolean _bfd_elf_close_and_cleanup
2258 extern bfd_boolean _bfd_elf_common_definition
2259 (Elf_Internal_Sym *);
2261 extern unsigned int _bfd_elf_common_section_index
2264 extern asection *_bfd_elf_common_section
2267 extern bfd_vma _bfd_elf_default_got_elt_size
2268 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2271 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2272 (bfd *, arelent *, struct bfd_symbol *, void *,
2273 asection *, bfd *, char **);
2275 extern bfd_boolean bfd_elf_final_link
2276 (bfd *, struct bfd_link_info *);
2278 extern void _bfd_elf_gc_keep
2279 (struct bfd_link_info *info);
2281 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2282 (struct elf_link_hash_entry *h, void *inf);
2284 extern bfd_boolean bfd_elf_gc_sections
2285 (bfd *, struct bfd_link_info *);
2287 extern bfd_boolean bfd_elf_gc_record_vtinherit
2288 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2290 extern bfd_boolean bfd_elf_gc_record_vtentry
2291 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2293 extern asection *_bfd_elf_gc_mark_hook
2294 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2295 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2297 extern asection *_bfd_elf_gc_mark_rsec
2298 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2299 struct elf_reloc_cookie *, bfd_boolean *);
2301 extern bfd_boolean _bfd_elf_gc_mark_reloc
2302 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2303 struct elf_reloc_cookie *);
2305 extern bfd_boolean _bfd_elf_gc_mark_fdes
2306 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2307 struct elf_reloc_cookie *);
2309 extern bfd_boolean _bfd_elf_gc_mark
2310 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2312 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2313 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2315 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2316 (bfd *, struct bfd_link_info *);
2318 extern bfd_boolean bfd_elf_gc_common_final_link
2319 (bfd *, struct bfd_link_info *);
2321 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2324 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2325 (bfd *, asection *);
2327 extern bfd_boolean _bfd_elf_map_sections_to_segments
2328 (bfd *, struct bfd_link_info *);
2330 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2332 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2335 extern asection *_bfd_elf_get_reloc_section (asection *);
2337 extern int bfd_elf_get_default_section_type (flagword);
2339 extern bfd_boolean bfd_elf_lookup_section_flags
2340 (struct bfd_link_info *, struct flag_info *, asection *);
2342 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2343 (bfd * abfd, asection * section);
2345 /* Exported interface for writing elf corefile notes. */
2346 extern char *elfcore_write_note
2347 (bfd *, char *, int *, const char *, int, const void *, int);
2348 extern char *elfcore_write_prpsinfo
2349 (bfd *, char *, int *, const char *, const char *);
2350 extern char *elfcore_write_prstatus
2351 (bfd *, char *, int *, long, int, const void *);
2352 extern char * elfcore_write_pstatus
2353 (bfd *, char *, int *, long, int, const void *);
2354 extern char *elfcore_write_prfpreg
2355 (bfd *, char *, int *, const void *, int);
2356 extern char *elfcore_write_prxfpreg
2357 (bfd *, char *, int *, const void *, int);
2358 extern char *elfcore_write_xstatereg
2359 (bfd *, char *, int *, const void *, int);
2360 extern char *elfcore_write_ppc_vmx
2361 (bfd *, char *, int *, const void *, int);
2362 extern char *elfcore_write_ppc_vsx
2363 (bfd *, char *, int *, const void *, int);
2364 extern char *elfcore_write_s390_timer
2365 (bfd *, char *, int *, const void *, int);
2366 extern char *elfcore_write_s390_todcmp
2367 (bfd *, char *, int *, const void *, int);
2368 extern char *elfcore_write_s390_todpreg
2369 (bfd *, char *, int *, const void *, int);
2370 extern char *elfcore_write_s390_ctrs
2371 (bfd *, char *, int *, const void *, int);
2372 extern char *elfcore_write_s390_prefix
2373 (bfd *, char *, int *, const void *, int);
2374 extern char *elfcore_write_s390_last_break
2375 (bfd *, char *, int *, const void *, int);
2376 extern char *elfcore_write_s390_system_call
2377 (bfd *, char *, int *, const void *, int);
2378 extern char *elfcore_write_s390_tdb
2379 (bfd *, char *, int *, const void *, int);
2380 extern char *elfcore_write_s390_vxrs_low
2381 (bfd *, char *, int *, const void *, int);
2382 extern char *elfcore_write_s390_vxrs_high
2383 (bfd *, char *, int *, const void *, int);
2384 extern char *elfcore_write_arm_vfp
2385 (bfd *, char *, int *, const void *, int);
2386 extern char *elfcore_write_aarch_tls
2387 (bfd *, char *, int *, const void *, int);
2388 extern char *elfcore_write_aarch_hw_break
2389 (bfd *, char *, int *, const void *, int);
2390 extern char *elfcore_write_aarch_hw_watch
2391 (bfd *, char *, int *, const void *, int);
2392 extern char *elfcore_write_lwpstatus
2393 (bfd *, char *, int *, long, int, const void *);
2394 extern char *elfcore_write_register_note
2395 (bfd *, char *, int *, const char *, const void *, int);
2397 /* Internal structure which holds information to be included in the
2398 PRPSINFO section of Linux core files.
2400 This is an "internal" structure in the sense that it should be used
2401 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2402 function), so things like endianess shouldn't be an issue. This
2403 structure will eventually be converted in one of the
2404 `elf_external_linux_*' structures and written out to an output bfd
2405 by one of the functions declared below. */
2407 struct elf_internal_linux_prpsinfo
2409 char pr_state; /* Numeric process state. */
2410 char pr_sname; /* Char for pr_state. */
2411 char pr_zomb; /* Zombie. */
2412 char pr_nice; /* Nice val. */
2413 unsigned long pr_flag; /* Flags. */
2414 unsigned int pr_uid;
2415 unsigned int pr_gid;
2416 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2417 char pr_fname[16 + 1]; /* Filename of executable. */
2418 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2421 /* Linux/most 32-bit archs. */
2422 extern char *elfcore_write_linux_prpsinfo32
2423 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2425 /* Linux/most 64-bit archs. */
2426 extern char *elfcore_write_linux_prpsinfo64
2427 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2429 /* Linux/PPC32 uses different layout compared to most archs. */
2430 extern char *elfcore_write_ppc_linux_prpsinfo32
2431 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2433 extern bfd *_bfd_elf32_bfd_from_remote_memory
2434 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2435 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2436 extern bfd *_bfd_elf64_bfd_from_remote_memory
2437 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2438 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2440 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2441 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2442 extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int);
2443 extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int);
2444 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2445 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2446 extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *);
2447 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2448 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2449 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int,
2450 unsigned int, const char *);
2451 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2452 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2455 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2456 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2457 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int);
2458 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2459 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2460 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2461 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2462 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2464 /* The linker may need to keep track of the number of relocs that it
2465 decides to copy as dynamic relocs in check_relocs for each symbol.
2466 This is so that it can later discard them if they are found to be
2467 unnecessary. We can store the information in a field extending the
2468 regular ELF linker hash table. */
2470 struct elf_dyn_relocs
2472 struct elf_dyn_relocs *next;
2474 /* The input section of the reloc. */
2477 /* Total number of relocs copied for the input section. */
2478 bfd_size_type count;
2480 /* Number of pc-relative relocs copied for the input section. */
2481 bfd_size_type pc_count;
2484 extern bfd_boolean _bfd_elf_create_ifunc_sections
2485 (bfd *, struct bfd_link_info *);
2486 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2487 (struct bfd_link_info *, struct elf_link_hash_entry *,
2488 struct elf_dyn_relocs **, unsigned int, unsigned int, unsigned int);
2489 extern long _bfd_elf_ifunc_get_synthetic_symtab
2490 (bfd *, long, asymbol **, long, asymbol **, asymbol **, asection *,
2491 bfd_vma *(*) (bfd *, asymbol **, asection *, asection *));
2493 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2494 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2496 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2497 extern bfd_vma elf64_r_sym (bfd_vma);
2498 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2499 extern bfd_vma elf32_r_sym (bfd_vma);
2501 /* Large common section. */
2502 extern asection _bfd_elf_large_com_section;
2504 /* Hash for local symbol with the first section id, ID, in the input
2505 file and the local symbol index, SYM. */
2506 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2507 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2508 ^ (SYM) ^ ((ID) >> 16))
2510 /* This is the condition under which finish_dynamic_symbol will be called.
2511 If our finish_dynamic_symbol isn't called, we'll need to do something
2512 about initializing any .plt and .got entries in relocate_section. */
2513 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2515 && ((SHARED) || !(H)->forced_local) \
2516 && ((H)->dynindx != -1 || (H)->forced_local))
2518 /* This macro is to avoid lots of duplicated code in the body
2519 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2520 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2521 r_symndx, symtab_hdr, sym_hashes, \
2522 h, sec, relocation, \
2523 unresolved_reloc, warned, ignored) \
2526 /* It seems this can happen with erroneous or unsupported \
2527 input (mixing a.out and elf in an archive, for example.) */ \
2528 if (sym_hashes == NULL) \
2531 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2533 if (info->wrap_hash != NULL \
2534 && (input_section->flags & SEC_DEBUGGING) != 0) \
2535 h = ((struct elf_link_hash_entry *) \
2536 unwrap_hash_lookup (info, input_bfd, &h->root)); \
2538 while (h->root.type == bfd_link_hash_indirect \
2539 || h->root.type == bfd_link_hash_warning) \
2540 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2544 unresolved_reloc = FALSE; \
2546 if (h->root.type == bfd_link_hash_defined \
2547 || h->root.type == bfd_link_hash_defweak) \
2549 sec = h->root.u.def.section; \
2551 || sec->output_section == NULL) \
2552 /* Set a flag that will be cleared later if we find a \
2553 relocation value for this symbol. output_section \
2554 is typically NULL for symbols satisfied by a shared \
2556 unresolved_reloc = TRUE; \
2558 relocation = (h->root.u.def.value \
2559 + sec->output_section->vma \
2560 + sec->output_offset); \
2562 else if (h->root.type == bfd_link_hash_undefweak) \
2564 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2565 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2567 else if (!bfd_link_relocatable (info)) \
2570 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2571 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2572 if (!info->callbacks->undefined_symbol (info, \
2573 h->root.root.string, \
2576 rel->r_offset, err)) \
2580 (void) unresolved_reloc; \
2586 /* This macro is to avoid lots of duplicated code in the body of the
2587 loop over relocations in xxx_relocate_section() in the various
2590 Handle relocations against symbols from removed linkonce sections,
2591 or sections discarded by a linker script. When doing a relocatable
2592 link, we remove such relocations. Otherwise, we just want the
2593 section contents zeroed and avoid any special processing. */
2594 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2595 rel, count, relend, \
2596 howto, index, contents) \
2599 _bfd_clear_contents (howto, input_bfd, input_section, \
2600 contents + rel[index].r_offset); \
2602 if (bfd_link_relocatable (info) \
2603 && (input_section->flags & SEC_DEBUGGING)) \
2605 /* Only remove relocations in debug sections since other \
2606 sections may require relocations. */ \
2607 Elf_Internal_Shdr *rel_hdr; \
2609 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2611 /* Avoid empty output section. */ \
2612 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2614 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2615 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2616 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2618 memmove (rel, rel + count, \
2619 (relend - rel - count) * sizeof (*rel)); \
2621 input_section->reloc_count--; \
2628 for (i_ = 0; i_ < count; i_++) \
2630 rel[i_].r_info = 0; \
2631 rel[i_].r_addend = 0; \
2637 /* Will a symbol be bound to the definition within the shared
2638 library, if any. A unique symbol can never be bound locally. */
2639 #define SYMBOLIC_BIND(INFO, H) \
2640 (!(H)->unique_global \
2641 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2646 #endif /* _LIBELF_H_ */