1 /* BFD back-end data structures for ELF files.
2 Copyright (C) 1992-2018 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. It is set to -3 if
128 this symbol is defined in a discarded section. */
131 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
132 -1 if this is not a dynamic symbol. */
133 /* ??? Note that this is consistently used as a synonym for tests
134 against whether we can perform various simplifying transformations
135 to the code. (E.g. changing a pc-relative jump to a PLT entry
136 into a pc-relative jump to the target function.) That test, which
137 is often relatively complex, and someplaces wrong or incomplete,
138 should really be replaced by a predicate in elflink.c.
140 End result: this field -1 does not indicate that the symbol is
141 not in the dynamic symbol table, but rather that the symbol is
142 not visible outside this DSO. */
145 /* If this symbol requires an entry in the global offset table, the
146 processor specific backend uses this field to track usage and
147 final offset. Two schemes are supported: The first assumes that
148 a symbol may only have one GOT entry, and uses REFCOUNT until
149 size_dynamic_sections, at which point the contents of the .got is
150 fixed. Afterward, if OFFSET is -1, then the symbol does not
151 require a global offset table entry. The second scheme allows
152 multiple GOT entries per symbol, managed via a linked list
153 pointed to by GLIST. */
154 union gotplt_union got;
156 /* Same, but tracks a procedure linkage table entry. */
157 union gotplt_union plt;
162 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
163 unsigned int type : 8;
165 /* Symbol st_other value, symbol visibility. */
166 unsigned int other : 8;
168 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */
169 unsigned int target_internal : 8;
171 /* Symbol is referenced by a non-shared object (other than the object
172 in which it is defined). */
173 unsigned int ref_regular : 1;
174 /* Symbol is defined by a non-shared object. */
175 unsigned int def_regular : 1;
176 /* Symbol is referenced by a shared object. */
177 unsigned int ref_dynamic : 1;
178 /* Symbol is defined by a shared object. */
179 unsigned int def_dynamic : 1;
180 /* Symbol has a non-weak reference from a non-shared object (other than
181 the object in which it is defined). */
182 unsigned int ref_regular_nonweak : 1;
183 /* Dynamic symbol has been adjustd. */
184 unsigned int dynamic_adjusted : 1;
185 /* Symbol needs a copy reloc. */
186 unsigned int needs_copy : 1;
187 /* Symbol needs a procedure linkage table entry. */
188 unsigned int needs_plt : 1;
189 /* Symbol appears in a non-ELF input file. */
190 unsigned int non_elf : 1;
191 /* Symbol version information. */
192 ENUM_BITFIELD (elf_symbol_version) versioned : 2;
193 /* Symbol was forced to local scope due to a version script file. */
194 unsigned int forced_local : 1;
195 /* Symbol was forced to be dynamic due to a version script file. */
196 unsigned int dynamic : 1;
197 /* Symbol was marked during garbage collection. */
198 unsigned int mark : 1;
199 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
200 not currently set by all the backends. */
201 unsigned int non_got_ref : 1;
202 /* Symbol has a definition in a shared object.
203 FIXME: There is no real need for this field if def_dynamic is never
204 cleared and all places that test def_dynamic also test def_regular. */
205 unsigned int dynamic_def : 1;
206 /* Symbol has a non-weak reference from a shared object. */
207 unsigned int ref_dynamic_nonweak : 1;
208 /* Symbol is referenced with a relocation where C/C++ pointer equality
210 unsigned int pointer_equality_needed : 1;
211 /* Symbol is a unique global symbol. */
212 unsigned int unique_global : 1;
213 /* Symbol is defined by a shared library with non-default visibility
214 in a read/write section. */
215 unsigned int protected_def : 1;
216 /* Symbol is __start_SECNAME or __stop_SECNAME to mark section
218 unsigned int start_stop : 1;
219 /* Symbol is or was a weak defined symbol from a dynamic object with
220 a strong defined symbol alias. U.ALIAS points to a list of aliases,
221 the definition having is_weakalias clear. */
222 unsigned int is_weakalias : 1;
224 /* String table index in .dynstr if this is a dynamic symbol. */
225 unsigned long dynstr_index;
229 /* Points to a circular list of non-function symbol aliases. */
230 struct elf_link_hash_entry *alias;
232 /* Hash value of the name computed using the ELF hash function.
233 Used part way through size_dynamic_sections, after we've finished
235 unsigned long elf_hash_value;
238 /* Version information. */
241 /* This field is used for a symbol which is not defined in a
242 regular object. It points to the version information read in
243 from the dynamic object. */
244 Elf_Internal_Verdef *verdef;
245 /* This field is used for a symbol which is defined in a regular
246 object. It is set up in size_dynamic_sections. It points to
247 the version information we should write out for this symbol. */
248 struct bfd_elf_version_tree *vertree;
253 /* For __start_SECNAME and __stop_SECNAME symbols, record the first
254 input section whose section name is SECNAME. */
255 asection *start_stop_section;
257 /* Vtable information. */
258 struct elf_link_virtual_table_entry *vtable;
262 /* Return the strong definition for a weak symbol with aliases. */
264 static inline struct elf_link_hash_entry *
265 weakdef (struct elf_link_hash_entry *h)
267 while (h->is_weakalias)
272 /* Will references to this symbol always reference the symbol
274 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
275 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
277 /* Will _calls_ to this symbol always call the version in this object? */
278 #define SYMBOL_CALLS_LOCAL(INFO, H) \
279 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
281 /* Whether an undefined weak symbol should resolve to its link-time
282 value, even in PIC or PIE objects. */
283 #define UNDEFWEAK_NO_DYNAMIC_RELOC(INFO, H) \
284 ((H)->root.type == bfd_link_hash_undefweak \
285 && (ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT \
286 || (INFO)->dynamic_undefined_weak == 0))
288 /* Common symbols that are turned into definitions don't have the
289 DEF_REGULAR flag set, so they might appear to be undefined.
290 Symbols defined in linker scripts also don't have DEF_REGULAR set. */
291 #define ELF_COMMON_DEF_P(H) \
293 && !(H)->def_dynamic \
294 && (H)->root.type == bfd_link_hash_defined)
296 /* Records local symbols to be emitted in the dynamic symbol table. */
298 struct elf_link_local_dynamic_entry
300 struct elf_link_local_dynamic_entry *next;
302 /* The input bfd this symbol came from. */
305 /* The index of the local symbol being copied. */
308 /* The index in the outgoing dynamic symbol table. */
311 /* A copy of the input symbol. */
312 Elf_Internal_Sym isym;
315 struct elf_link_loaded_list
317 struct elf_link_loaded_list *next;
321 /* Structures used by the eh_frame optimization code. */
326 /* If REMOVED == 1, this is the CIE that the FDE originally used.
327 The CIE belongs to the same .eh_frame input section as the FDE.
329 If REMOVED == 0, this is the CIE that we have chosen to use for
330 the output FDE. The CIE's REMOVED field is also 0, but the CIE
331 might belong to a different .eh_frame input section from the FDE.
333 May be NULL to signify that the FDE should be discarded. */
334 struct eh_cie_fde *cie_inf;
335 struct eh_cie_fde *next_for_section;
338 /* CIEs have three states:
340 - REMOVED && !MERGED: Slated for removal because we haven't yet
341 proven that an FDE needs it. FULL_CIE, if nonnull, points to
342 more detailed information about the CIE.
344 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
345 which may not belong to the same input section.
347 - !REMOVED: We have decided to keep this CIE. SEC is the
348 .eh_frame input section that contains the CIE. */
350 struct cie *full_cie;
351 struct eh_cie_fde *merged_with;
355 /* The offset of the personality data from the start of the CIE,
356 or 0 if the CIE doesn't have any. */
357 unsigned int personality_offset : 8;
359 /* Length of augmentation. aug_str_len is the length of the
360 string including null terminator. aug_data_len is the length
361 of the rest up to the initial insns. */
362 unsigned int aug_str_len : 3;
363 unsigned int aug_data_len : 5;
365 /* True if we have marked relocations associated with this CIE. */
366 unsigned int gc_mark : 1;
368 /* True if we have decided to turn an absolute LSDA encoding into
369 a PC-relative one. */
370 unsigned int make_lsda_relative : 1;
372 /* True if we have decided to turn an absolute personality
373 encoding into a PC-relative one. */
374 unsigned int make_per_encoding_relative : 1;
376 /* True if the CIE contains personality data and if that
377 data uses a PC-relative encoding. Always true when
378 make_per_encoding_relative is. */
379 unsigned int per_encoding_relative : 1;
381 /* True if the CIE contains personality data aligned to a
382 multiple of eight bytes. */
383 unsigned int per_encoding_aligned8 : 1;
385 /* True if we need to add an 'R' (FDE encoding) entry to the
386 CIE's augmentation data. */
387 unsigned int add_fde_encoding : 1;
389 /* True if we have merged this CIE with another. */
390 unsigned int merged : 1;
393 unsigned int pad1 : 9;
396 unsigned int reloc_index;
399 unsigned int new_offset;
400 unsigned int fde_encoding : 8;
401 unsigned int lsda_encoding : 8;
402 unsigned int lsda_offset : 8;
404 /* True if this entry represents a CIE, false if it represents an FDE. */
405 unsigned int cie : 1;
407 /* True if this entry is currently marked for removal. */
408 unsigned int removed : 1;
410 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
411 augmentation data, and an associated byte to each of the CIE's FDEs. */
412 unsigned int add_augmentation_size : 1;
414 /* True if we have decided to convert absolute FDE relocations into
415 relative ones. This applies to the first relocation in the FDE,
416 which is against the code that the FDE describes. */
417 unsigned int make_relative : 1;
420 unsigned int pad1 : 4;
422 unsigned int *set_loc;
425 struct eh_frame_sec_info
429 struct eh_cie_fde entry[1];
432 struct eh_frame_array_ent
441 #define DWARF2_EH_HDR 1
442 #define COMPACT_EH_HDR 2
444 /* Endian-neutral code indicating that a function cannot be unwound. */
445 #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01
447 struct dwarf_eh_frame_hdr_info
450 unsigned int fde_count;
451 /* TRUE if .eh_frame_hdr should contain the sorted search table.
452 We build it if we successfully read all .eh_frame input sections
453 and recognize them. */
455 struct eh_frame_array_ent *array;
458 struct compact_eh_frame_hdr_info
460 unsigned int allocated_entries;
461 /* eh_frame_entry fragments. */
465 struct eh_frame_hdr_info
468 unsigned int array_count;
469 bfd_boolean frame_hdr_is_compact;
472 struct dwarf_eh_frame_hdr_info dwarf;
473 struct compact_eh_frame_hdr_info compact;
478 /* Enum used to identify target specific extensions to the elf_obj_tdata
479 and elf_link_hash_table structures. Note the enums deliberately start
480 from 1 so that we can detect an uninitialized field. The generic value
481 is last so that additions to this enum do not need to modify more than
485 AARCH64_ELF_DATA = 1,
525 struct elf_sym_strtab
527 Elf_Internal_Sym sym;
528 unsigned long dest_index;
529 unsigned long destshndx_index;
532 /* ELF linker hash table. */
534 struct elf_link_hash_table
536 struct bfd_link_hash_table root;
538 /* An identifier used to distinguish different target
539 specific extensions to this structure. */
540 enum elf_target_id hash_table_id;
542 /* Whether we have created the special dynamic sections required
543 when linking against or generating a shared object. */
544 bfd_boolean dynamic_sections_created;
546 /* True if this target has relocatable executables, so needs dynamic
548 bfd_boolean is_relocatable_executable;
550 /* The BFD used to hold special sections created by the linker.
551 This will be the first BFD found which requires these sections to
555 /* The value to use when initialising got.refcount/offset and
556 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
557 the values are refcounts. Set to init_got_offset/init_plt_offset
558 in size_dynamic_sections when the values may be offsets. */
559 union gotplt_union init_got_refcount;
560 union gotplt_union init_plt_refcount;
562 /* The value to use for got.refcount/offset and plt.refcount/offset
563 when the values may be offsets. Normally (bfd_vma) -1. */
564 union gotplt_union init_got_offset;
565 union gotplt_union init_plt_offset;
567 /* The number of symbols found in the link which is intended for the
568 mandatory DT_SYMTAB tag (.dynsym section) in .dynamic section. */
569 bfd_size_type dynsymcount;
570 bfd_size_type local_dynsymcount;
572 /* The string table of dynamic symbols, which becomes the .dynstr
574 struct elf_strtab_hash *dynstr;
576 /* The number of symbol strings found in the link which must be put
577 into the .strtab section. */
578 bfd_size_type strtabcount;
580 /* The array size of the symbol string table, which becomes the
582 bfd_size_type strtabsize;
584 /* The array of strings, which becomes the .strtab section. */
585 struct elf_sym_strtab *strtab;
587 /* The number of buckets in the hash table in the .hash section.
588 This is based on the number of dynamic symbols. */
589 bfd_size_type bucketcount;
591 /* A linked list of DT_NEEDED names found in dynamic objects
592 included in the link. */
593 struct bfd_link_needed_list *needed;
595 /* Sections in the output bfd that provides a section symbol
596 to be used by relocations emitted against local symbols.
597 Most targets will not use data_index_section. */
598 asection *text_index_section;
599 asection *data_index_section;
601 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
602 struct elf_link_hash_entry *hgot;
604 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
605 struct elf_link_hash_entry *hplt;
607 /* The _DYNAMIC symbol. */
608 struct elf_link_hash_entry *hdynamic;
610 /* A pointer to information used to merge SEC_MERGE sections. */
613 /* Used to link stabs in sections. */
614 struct stab_info stab_info;
616 /* Used by eh_frame code when editing .eh_frame. */
617 struct eh_frame_hdr_info eh_info;
619 /* A linked list of local symbols to be added to .dynsym. */
620 struct elf_link_local_dynamic_entry *dynlocal;
622 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
623 objects included in the link. */
624 struct bfd_link_needed_list *runpath;
626 /* Cached first output tls section and size of PT_TLS segment. */
628 bfd_size_type tls_size;
630 /* A linked list of BFD's loaded in the link. */
631 struct elf_link_loaded_list *loaded;
633 /* Short-cuts to get to dynamic linker sections. */
642 asection *sreldynrelro;
650 /* Look up an entry in an ELF linker hash table. */
652 #define elf_link_hash_lookup(table, string, create, copy, follow) \
653 ((struct elf_link_hash_entry *) \
654 bfd_link_hash_lookup (&(table)->root, (string), (create), \
657 /* Traverse an ELF linker hash table. */
659 #define elf_link_hash_traverse(table, func, info) \
660 (bfd_link_hash_traverse \
662 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
665 /* Get the ELF linker hash table from a link_info structure. */
667 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
669 #define elf_hash_table_id(table) ((table) -> hash_table_id)
671 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
672 #define is_elf_hash_table(htab) \
673 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
675 /* Used by bfd_sym_from_r_symndx to cache a small number of local
677 #define LOCAL_SYM_CACHE_SIZE 32
681 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
682 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
685 /* Constant information held for an ELF backend. */
687 struct elf_size_info {
688 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
689 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
691 /* The size of entries in the .hash section. */
692 unsigned char sizeof_hash_entry;
694 /* The number of internal relocations to allocate per external
696 unsigned char int_rels_per_ext_rel;
697 /* We use some fixed size arrays. This should be large enough to
698 handle all back-ends. */
699 #define MAX_INT_RELS_PER_EXT_REL 3
701 unsigned char arch_size, log_file_align;
702 unsigned char elfclass, ev_current;
703 int (*write_out_phdrs)
704 (bfd *, const Elf_Internal_Phdr *, unsigned int);
706 (*write_shdrs_and_ehdr) (bfd *);
707 bfd_boolean (*checksum_contents)
708 (bfd * , void (*) (const void *, size_t, void *), void *);
710 (bfd *, asection *, void *);
711 bfd_boolean (*swap_symbol_in)
712 (bfd *, const void *, const void *, Elf_Internal_Sym *);
713 void (*swap_symbol_out)
714 (bfd *, const Elf_Internal_Sym *, void *, void *);
715 bfd_boolean (*slurp_reloc_table)
716 (bfd *, asection *, asymbol **, bfd_boolean);
717 long (*slurp_symbol_table)
718 (bfd *, asymbol **, bfd_boolean);
720 (bfd *, const void *, Elf_Internal_Dyn *);
722 (bfd *, const Elf_Internal_Dyn *, void *);
724 /* This function is called to swap in a REL relocation. If an
725 external relocation corresponds to more than one internal
726 relocation, then all relocations are swapped in at once. */
727 void (*swap_reloc_in)
728 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
730 /* This function is called to swap out a REL relocation. */
731 void (*swap_reloc_out)
732 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
734 /* This function is called to swap in a RELA relocation. If an
735 external relocation corresponds to more than one internal
736 relocation, then all relocations are swapped in at once. */
737 void (*swap_reloca_in)
738 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
740 /* This function is called to swap out a RELA relocation. */
741 void (*swap_reloca_out)
742 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
745 #define elf_symbol_from(ABFD,S) \
746 (((S)->the_bfd != NULL \
747 && (S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
748 && (S)->the_bfd->tdata.elf_obj_data != 0) \
749 ? (elf_symbol_type *) (S) \
752 enum elf_reloc_type_class {
754 reloc_class_relative,
760 struct elf_reloc_cookie
762 Elf_Internal_Rela *rels, *rel, *relend;
763 Elf_Internal_Sym *locsyms;
767 struct elf_link_hash_entry **sym_hashes;
769 bfd_boolean bad_symtab;
772 /* The level of IRIX compatibility we're striving for. */
780 /* Mapping of ELF section names and types. */
781 struct bfd_elf_special_section
784 unsigned int prefix_length;
785 /* 0 means name must match PREFIX exactly.
786 -1 means name must start with PREFIX followed by an arbitrary string.
787 -2 means name must match PREFIX exactly or consist of PREFIX followed
788 by a dot then anything.
789 > 0 means name must start with the first PREFIX_LENGTH chars of
790 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
791 signed int suffix_length;
796 enum action_discarded
802 typedef asection * (*elf_gc_mark_hook_fn)
803 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
804 struct elf_link_hash_entry *, Elf_Internal_Sym *);
806 enum elf_property_kind
808 /* A new property. */
809 property_unknown = 0,
810 /* A property ignored by backend. */
812 /* A corrupt property reported by backend. */
814 /* A property should be removed due to property merge. */
816 /* A property which is a number. */
820 typedef struct elf_property
822 unsigned int pr_type;
823 unsigned int pr_datasz;
826 /* For property_number, this is a number. */
828 /* Add a new one if elf_property_kind is updated. */
830 enum elf_property_kind pr_kind;
833 typedef struct elf_property_list
835 struct elf_property_list *next;
836 struct elf_property property;
839 struct bfd_elf_section_reloc_data;
841 struct elf_backend_data
843 /* The architecture for this backend. */
844 enum bfd_architecture arch;
846 /* An identifier used to distinguish different target specific
847 extensions to elf_obj_tdata and elf_link_hash_table structures. */
848 enum elf_target_id target_id;
850 /* The ELF machine code (EM_xxxx) for this backend. */
851 int elf_machine_code;
856 /* The maximum page size for this backend. */
859 /* The minimum page size for this backend. An input object will not be
860 considered page aligned unless its sections are correctly aligned for
861 pages at least this large. May be smaller than maxpagesize. */
864 /* The common page size for this backend. */
865 bfd_vma commonpagesize;
867 /* The value of commonpagesize to use when -z relro for this backend. */
868 bfd_vma relropagesize;
870 /* The BFD flags applied to sections created for dynamic linking. */
871 flagword dynamic_sec_flags;
873 /* Architecture-specific data for this backend.
874 This is actually a pointer to some type like struct elf_ARCH_data. */
875 const void *arch_data;
877 /* A function to translate an ELF RELA relocation to a BFD arelent
878 structure. Returns TRUE upon success, FALSE otherwise. */
879 bfd_boolean (*elf_info_to_howto)
880 (bfd *, arelent *, Elf_Internal_Rela *);
882 /* A function to translate an ELF REL relocation to a BFD arelent
883 structure. Returns TRUE upon success, FALSE otherwise. */
884 bfd_boolean (*elf_info_to_howto_rel)
885 (bfd *, arelent *, Elf_Internal_Rela *);
887 /* A function to determine whether a symbol is global when
888 partitioning the symbol table into local and global symbols.
889 This should be NULL for most targets, in which case the correct
890 thing will be done. MIPS ELF, at least on the Irix 5, has
891 special requirements. */
892 bfd_boolean (*elf_backend_sym_is_global)
895 /* The remaining functions are hooks which are called only if they
898 /* A function to permit a backend specific check on whether a
899 particular BFD format is relevant for an object file, and to
900 permit the backend to set any global information it wishes. When
901 this is called elf_elfheader is set, but anything else should be
902 used with caution. If this returns FALSE, the check_format
903 routine will return a bfd_error_wrong_format error. */
904 bfd_boolean (*elf_backend_object_p)
907 /* A function to do additional symbol processing when reading the
908 ELF symbol table. This is where any processor-specific special
909 section indices are handled. */
910 void (*elf_backend_symbol_processing)
913 /* A function to do additional symbol processing after reading the
914 entire ELF symbol table. */
915 bfd_boolean (*elf_backend_symbol_table_processing)
916 (bfd *, elf_symbol_type *, unsigned int);
918 /* A function to set the type of the info field. Processor-specific
919 types should be handled here. */
920 int (*elf_backend_get_symbol_type)
921 (Elf_Internal_Sym *, int);
923 /* A function to return the linker hash table entry of a symbol that
924 might be satisfied by an archive symbol. */
925 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
926 (bfd *, struct bfd_link_info *, const char *);
928 /* Return true if local section symbols should have a non-null st_name.
929 NULL implies false. */
930 bfd_boolean (*elf_backend_name_local_section_symbols)
933 /* A function to do additional processing on the ELF section header
934 just before writing it out. This is used to set the flags and
935 type fields for some sections, or to actually write out data for
937 bfd_boolean (*elf_backend_section_processing)
938 (bfd *, Elf_Internal_Shdr *);
940 /* A function to handle unusual section types when creating BFD
941 sections from ELF sections. */
942 bfd_boolean (*elf_backend_section_from_shdr)
943 (bfd *, Elf_Internal_Shdr *, const char *, int);
945 /* A function to convert machine dependent ELF section header flags to
946 BFD internal section header flags. */
947 bfd_boolean (*elf_backend_section_flags)
948 (flagword *, const Elf_Internal_Shdr *);
950 /* A function that returns a struct containing ELF section flags and
951 type for the given BFD section. */
952 const struct bfd_elf_special_section * (*get_sec_type_attr)
955 /* A function to handle unusual program segment types when creating BFD
956 sections from ELF program segments. */
957 bfd_boolean (*elf_backend_section_from_phdr)
958 (bfd *, Elf_Internal_Phdr *, int, const char *);
960 /* A function to set up the ELF section header for a BFD section in
961 preparation for writing it out. This is where the flags and type
962 fields are set for unusual sections. */
963 bfd_boolean (*elf_backend_fake_sections)
964 (bfd *, Elf_Internal_Shdr *, asection *);
966 /* A function to get the ELF section index for a BFD section. If
967 this returns TRUE, the section was found. If it is a normal ELF
968 section, *RETVAL should be left unchanged. If it is not a normal
969 ELF section *RETVAL should be set to the SHN_xxxx index. */
970 bfd_boolean (*elf_backend_section_from_bfd_section)
971 (bfd *, asection *, int *retval);
973 /* If this field is not NULL, it is called by the add_symbols phase
974 of a link just before adding a symbol to the global linker hash
975 table. It may modify any of the fields as it wishes. If *NAME
976 is set to NULL, the symbol will be skipped rather than being
977 added to the hash table. This function is responsible for
978 handling all processor dependent symbol bindings and section
979 indices, and must set at least *FLAGS and *SEC for each processor
980 dependent case; failure to do so will cause a link error. */
981 bfd_boolean (*elf_add_symbol_hook)
982 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
983 const char **name, flagword *flags, asection **sec, bfd_vma *value);
985 /* If this field is not NULL, it is called by the elf_link_output_sym
986 phase of a link for each symbol which will appear in the object file.
987 On error, this function returns 0. 1 is returned when the symbol
988 should be output, 2 is returned when the symbol should be discarded. */
989 int (*elf_backend_link_output_symbol_hook)
990 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
991 asection *, struct elf_link_hash_entry *);
993 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
994 linker the first time it encounters a dynamic object in the link.
995 This function must create any sections required for dynamic
996 linking. The ABFD argument is a dynamic object. The .interp,
997 .dynamic, .dynsym, .dynstr, and .hash functions have already been
998 created, and this function may modify the section flags if
999 desired. This function will normally create the .got and .plt
1000 sections, but different backends have different requirements. */
1001 bfd_boolean (*elf_backend_create_dynamic_sections)
1002 (bfd *abfd, struct bfd_link_info *info);
1004 /* When creating a shared library, determine whether to omit the
1005 dynamic symbol for the section. */
1006 bfd_boolean (*elf_backend_omit_section_dynsym)
1007 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
1009 /* Return TRUE if relocations of targets are compatible to the extent
1010 that CHECK_RELOCS will properly process them. PR 4424. */
1011 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
1013 /* The CHECK_RELOCS function is called by the add_symbols phase of
1014 the ELF backend linker. It is called once for each section with
1015 relocs of an object file, just after the symbols for the object
1016 file have been added to the global linker hash table. The
1017 function must look through the relocs and do any special handling
1018 required. This generally means allocating space in the global
1019 offset table, and perhaps allocating space for a reloc. The
1020 relocs are always passed as Rela structures; if the section
1021 actually uses Rel structures, the r_addend field will always be
1023 bfd_boolean (*check_relocs)
1024 (bfd *abfd, struct bfd_link_info *info, asection *o,
1025 const Elf_Internal_Rela *relocs);
1027 /* The CHECK_DIRECTIVES function is called once per input file by
1028 the add_symbols phase of the ELF backend linker. The function
1029 must inspect the bfd and create any additional symbols according
1030 to any custom directives in the bfd. */
1031 bfd_boolean (*check_directives)
1032 (bfd *abfd, struct bfd_link_info *info);
1034 /* The NOTICE_AS_NEEDED function is called as the linker is about to
1035 handle an as-needed lib (ACT = notice_as_needed), and after the
1036 linker has decided to keep the lib (ACT = notice_needed) or when
1037 the lib is not needed (ACT = notice_not_needed). */
1038 bfd_boolean (*notice_as_needed)
1039 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act);
1041 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
1042 linker for every symbol which is defined by a dynamic object and
1043 referenced by a regular object. This is called after all the
1044 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
1045 function has been called. The hash table entry should be
1046 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
1047 defined in a section from a dynamic object. Dynamic object
1048 sections are not included in the final link, and this function is
1049 responsible for changing the value to something which the rest of
1050 the link can deal with. This will normally involve adding an
1051 entry to the .plt or .got or some such section, and setting the
1052 symbol to point to that. */
1053 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
1054 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
1056 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
1057 after all the linker input files have been seen but before the
1058 section sizes have been set. This is called after
1059 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
1060 bfd_boolean (*elf_backend_always_size_sections)
1061 (bfd *output_bfd, struct bfd_link_info *info);
1063 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
1064 linker after all the linker input files have been seen but before
1065 the sections sizes have been set. This is called after
1066 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
1067 It is only called when linking against a dynamic object. It must
1068 set the sizes of the dynamic sections, and may fill in their
1069 contents as well. The generic ELF linker can handle the .dynsym,
1070 .dynstr and .hash sections. This function must handle the
1071 .interp section and any sections created by the
1072 CREATE_DYNAMIC_SECTIONS entry point. */
1073 bfd_boolean (*elf_backend_size_dynamic_sections)
1074 (bfd *output_bfd, struct bfd_link_info *info);
1076 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
1077 we keep to use as a base for relocs and symbols. */
1078 void (*elf_backend_init_index_section)
1079 (bfd *output_bfd, struct bfd_link_info *info);
1081 /* The RELOCATE_SECTION function is called by the ELF backend linker
1082 to handle the relocations for a section.
1084 The relocs are always passed as Rela structures; if the section
1085 actually uses Rel structures, the r_addend field will always be
1088 This function is responsible for adjust the section contents as
1089 necessary, and (if using Rela relocs and generating a
1090 relocatable output file) adjusting the reloc addend as
1093 This function does not have to worry about setting the reloc
1094 address or the reloc symbol index.
1096 LOCAL_SYMS is a pointer to the swapped in local symbols.
1098 LOCAL_SECTIONS is an array giving the section in the input file
1099 corresponding to the st_shndx field of each local symbol.
1101 The global hash table entry for the global symbols can be found
1102 via elf_sym_hashes (input_bfd).
1104 When generating relocatable output, this function must handle
1105 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1106 going to be the section symbol corresponding to the output
1107 section, which means that the addend must be adjusted
1110 Returns FALSE on error, TRUE on success, 2 if successful and
1111 relocations should be written for this section. */
1112 int (*elf_backend_relocate_section)
1113 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
1114 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
1115 Elf_Internal_Sym *local_syms, asection **local_sections);
1117 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
1118 linker just before it writes a symbol out to the .dynsym section.
1119 The processor backend may make any required adjustment to the
1120 symbol. It may also take the opportunity to set contents of the
1121 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
1122 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
1123 on those symbols which are defined by a dynamic object. */
1124 bfd_boolean (*elf_backend_finish_dynamic_symbol)
1125 (bfd *output_bfd, struct bfd_link_info *info,
1126 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
1128 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
1129 linker just before it writes all the dynamic sections out to the
1130 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
1131 all dynamic symbols. */
1132 bfd_boolean (*elf_backend_finish_dynamic_sections)
1133 (bfd *output_bfd, struct bfd_link_info *info);
1135 /* A function to do any beginning processing needed for the ELF file
1136 before building the ELF headers and computing file positions. */
1137 void (*elf_backend_begin_write_processing)
1138 (bfd *, struct bfd_link_info *);
1140 /* A function to do any final processing needed for the ELF file
1141 before writing it out. The LINKER argument is TRUE if this BFD
1142 was created by the ELF backend linker. */
1143 void (*elf_backend_final_write_processing)
1144 (bfd *, bfd_boolean linker);
1146 /* This function is called by get_program_header_size. It should
1147 return the number of additional program segments which this BFD
1148 will need. It should return -1 on error. */
1149 int (*elf_backend_additional_program_headers)
1150 (bfd *, struct bfd_link_info *);
1152 /* This function is called to modify an existing segment map in a
1153 backend specific fashion. */
1154 bfd_boolean (*elf_backend_modify_segment_map)
1155 (bfd *, struct bfd_link_info *);
1157 /* This function is called to modify program headers just before
1158 they are written. */
1159 bfd_boolean (*elf_backend_modify_program_headers)
1160 (bfd *, struct bfd_link_info *);
1162 /* This function is called to see if the PHDR header should be
1163 checked for validity. */
1164 bfd_boolean (*elf_backend_allow_non_load_phdr)
1165 (bfd *, const Elf_Internal_Phdr *, unsigned);
1167 /* This function is called before section garbage collection to
1168 mark entry symbol sections. */
1170 (struct bfd_link_info *);
1172 /* This function is called during section garbage collection to
1173 mark sections that define global symbols. */
1174 bfd_boolean (*gc_mark_dynamic_ref)
1175 (struct elf_link_hash_entry *, void *);
1177 /* This function is called during section gc to discover the section a
1178 particular relocation refers to. */
1179 elf_gc_mark_hook_fn gc_mark_hook;
1181 /* This function, if defined, is called after the first gc marking pass
1182 to allow the backend to mark additional sections. */
1183 bfd_boolean (*gc_mark_extra_sections)
1184 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1186 /* This function, if defined, is called after the ELF headers have
1187 been created. This allows for things like the OS and ABI versions
1189 void (*elf_backend_post_process_headers)
1190 (bfd *, struct bfd_link_info *);
1192 /* This function, if defined, prints a symbol to file and returns the
1193 name of the symbol to be printed. It should return NULL to fall
1194 back to default symbol printing. */
1195 const char *(*elf_backend_print_symbol_all)
1196 (bfd *, void *, asymbol *);
1198 /* This function, if defined, is called after all local symbols and
1199 global symbols converted to locals are emitted into the symtab
1200 section. It allows the backend to emit special local symbols
1201 not handled in the hash table. */
1202 bfd_boolean (*elf_backend_output_arch_local_syms)
1203 (bfd *, struct bfd_link_info *, void *,
1204 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1205 struct elf_link_hash_entry *));
1207 /* This function, if defined, is called after all symbols are emitted
1208 into the symtab section. It allows the backend to emit special
1209 global symbols not handled in the hash table. */
1210 bfd_boolean (*elf_backend_output_arch_syms)
1211 (bfd *, struct bfd_link_info *, void *,
1212 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1213 struct elf_link_hash_entry *));
1215 /* Filter what symbols of the output file to include in the import
1216 library if one is created. */
1217 unsigned int (*elf_backend_filter_implib_symbols)
1218 (bfd *, struct bfd_link_info *, asymbol **, long);
1220 /* Copy any information related to dynamic linking from a pre-existing
1221 symbol to a newly created symbol. Also called to copy flags and
1222 other back-end info to a weakdef, in which case the symbol is not
1223 newly created and plt/got refcounts and dynamic indices should not
1225 void (*elf_backend_copy_indirect_symbol)
1226 (struct bfd_link_info *, struct elf_link_hash_entry *,
1227 struct elf_link_hash_entry *);
1229 /* Modify any information related to dynamic linking such that the
1230 symbol is not exported. */
1231 void (*elf_backend_hide_symbol)
1232 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1234 /* A function to do additional symbol fixup, called by
1235 _bfd_elf_fix_symbol_flags. */
1236 bfd_boolean (*elf_backend_fixup_symbol)
1237 (struct bfd_link_info *, struct elf_link_hash_entry *);
1239 /* Merge the backend specific symbol attribute. */
1240 void (*elf_backend_merge_symbol_attribute)
1241 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1244 /* This function, if defined, will return a string containing the
1245 name of a target-specific dynamic tag. */
1246 char *(*elf_backend_get_target_dtag)
1249 /* Decide whether an undefined symbol is special and can be ignored.
1250 This is the case for OPTIONAL symbols on IRIX. */
1251 bfd_boolean (*elf_backend_ignore_undef_symbol)
1252 (struct elf_link_hash_entry *);
1254 /* Emit relocations. Overrides default routine for emitting relocs,
1255 except during a relocatable link, or if all relocs are being emitted. */
1256 bfd_boolean (*elf_backend_emit_relocs)
1257 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1258 struct elf_link_hash_entry **);
1260 /* Update relocations. It is allowed to change the number and the order.
1261 In such a case hashes should be invalidated. */
1262 void (*elf_backend_update_relocs)
1263 (asection *, struct bfd_elf_section_reloc_data *);
1265 /* Count relocations. Not called for relocatable links
1266 or if all relocs are being preserved in the output. */
1267 unsigned int (*elf_backend_count_relocs)
1268 (struct bfd_link_info *, asection *);
1270 /* Count additionals relocations. Called for relocatable links if
1271 additional relocations needs to be created. */
1272 unsigned int (*elf_backend_count_additional_relocs)
1275 /* Say whether to sort relocs output by ld -r and ld --emit-relocs,
1276 by r_offset. If NULL, default to true. */
1277 bfd_boolean (*sort_relocs_p)
1280 /* This function, if defined, is called when an NT_PRSTATUS note is found
1282 bfd_boolean (*elf_backend_grok_prstatus)
1283 (bfd *, Elf_Internal_Note *);
1285 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1286 note is found in a core file. */
1287 bfd_boolean (*elf_backend_grok_psinfo)
1288 (bfd *, Elf_Internal_Note *);
1290 /* This function, if defined, is called when a "FreeBSD" NT_PRSTATUS
1291 note is found in a core file. */
1292 bfd_boolean (*elf_backend_grok_freebsd_prstatus)
1293 (bfd *, Elf_Internal_Note *);
1295 /* This function, if defined, is called to write a note to a corefile. */
1296 char *(*elf_backend_write_core_note)
1297 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1299 /* This function, if defined, is called to convert target-specific
1300 section flag names into hex values. */
1301 flagword (*elf_backend_lookup_section_flags_hook)
1304 /* This function returns class of a reloc type. */
1305 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1306 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *);
1308 /* This function, if defined, removes information about discarded functions
1309 from other sections which mention them. */
1310 bfd_boolean (*elf_backend_discard_info)
1311 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1313 /* This function, if defined, signals that the function above has removed
1314 the discarded relocations for this section. */
1315 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1318 /* What to do when ld finds relocations against symbols defined in
1319 discarded sections. */
1320 unsigned int (*action_discarded)
1323 /* This function returns the width of FDE pointers in bytes, or 0 if
1324 that can't be determined for some reason. The default definition
1325 goes by the bfd's EI_CLASS. */
1326 unsigned int (*elf_backend_eh_frame_address_size)
1327 (bfd *, const asection *);
1329 /* These functions tell elf-eh-frame whether to attempt to turn
1330 absolute or lsda encodings into pc-relative ones. The default
1331 definition enables these transformations. */
1332 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1333 (bfd *, struct bfd_link_info *, asection *);
1334 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1335 (bfd *, struct bfd_link_info *, asection *);
1337 /* This function returns an encoding after computing the encoded
1338 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1339 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1340 The default definition chooses a 32-bit PC-relative encoding. */
1341 bfd_byte (*elf_backend_encode_eh_address)
1342 (bfd *abfd, struct bfd_link_info *info,
1343 asection *osec, bfd_vma offset,
1344 asection *loc_sec, bfd_vma loc_offset,
1347 /* This function, if defined, may write out the given section.
1348 Returns TRUE if it did so and FALSE if the caller should. */
1349 bfd_boolean (*elf_backend_write_section)
1350 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1352 /* The level of IRIX compatibility we're striving for.
1353 MIPS ELF specific function. */
1354 irix_compat_t (*elf_backend_mips_irix_compat)
1357 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1358 (bfd *, unsigned int, bfd_boolean);
1360 /* The swapping table to use when dealing with ECOFF information.
1361 Used for the MIPS ELF .mdebug section. */
1362 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1364 /* This function implements `bfd_elf_bfd_from_remote_memory';
1365 see elf.c, elfcode.h. */
1366 bfd *(*elf_backend_bfd_from_remote_memory)
1367 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
1368 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1369 bfd_size_type len));
1371 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1373 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1375 /* Is symbol defined in common section? */
1376 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1378 /* Return a common section index for section. */
1379 unsigned int (*common_section_index) (asection *);
1381 /* Return a common section for section. */
1382 asection *(*common_section) (asection *);
1384 /* Return TRUE if we can merge 2 definitions. */
1385 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *,
1386 const Elf_Internal_Sym *, asection **,
1387 bfd_boolean, bfd_boolean,
1388 bfd *, const asection *);
1390 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1391 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1393 /* Return TRUE if type is a function symbol type. */
1394 bfd_boolean (*is_function_type) (unsigned int type);
1396 /* If the ELF symbol SYM might be a function in SEC, return the
1397 function size and set *CODE_OFF to the function's entry point,
1398 otherwise return zero. */
1399 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1402 /* Given NAME, the name of a relocation section stripped of its
1403 .rel/.rela prefix, return the section in ABFD to which the
1404 relocations apply. */
1405 asection *(*get_reloc_section) (bfd *abfd, const char *name);
1407 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
1408 has a type >= SHT_LOOS. Returns TRUE if the fields were initialised,
1409 FALSE otherwise. Can be called multiple times for a given section,
1410 until it returns TRUE. Most of the times it is called ISECTION will be
1411 set to an input section that might be associated with the output section.
1412 The last time that it is called, ISECTION will be set to NULL. */
1413 bfd_boolean (*elf_backend_copy_special_section_fields)
1414 (const bfd *ibfd, bfd *obfd, const Elf_Internal_Shdr *isection,
1415 Elf_Internal_Shdr *osection);
1417 /* Used to handle bad SHF_LINK_ORDER input. */
1418 void (*link_order_error_handler) (const char *, ...);
1420 /* Name of the PLT relocation section. */
1421 const char *relplt_name;
1423 /* Alternate EM_xxxx machine codes for this backend. */
1424 int elf_machine_alt1;
1425 int elf_machine_alt2;
1427 const struct elf_size_info *s;
1429 /* An array of target specific special sections. */
1430 const struct bfd_elf_special_section *special_sections;
1432 /* The size in bytes of the header for the GOT. This includes the
1433 so-called reserved entries on some systems. */
1434 bfd_vma got_header_size;
1436 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1437 otherwise by the local symbol with index SYMNDX in IBFD. */
1438 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1439 struct elf_link_hash_entry *h,
1440 bfd *ibfd, unsigned long symndx);
1442 /* The vendor name to use for a processor-standard attributes section. */
1443 const char *obj_attrs_vendor;
1445 /* The section name to use for a processor-standard attributes section. */
1446 const char *obj_attrs_section;
1448 /* Return 1, 2 or 3 to indicate what type of arguments a
1449 processor-specific tag takes. */
1450 int (*obj_attrs_arg_type) (int);
1452 /* The section type to use for an attributes section. */
1453 unsigned int obj_attrs_section_type;
1455 /* This function determines the order in which any attributes are
1456 written. It must be defined for input in the range
1457 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1458 is used in order to make unity easy). The returned value is the
1459 actual tag number to place in the input position. */
1460 int (*obj_attrs_order) (int);
1462 /* Handle merging unknown attributes; either warn and return TRUE,
1463 or give an error and return FALSE. */
1464 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1466 /* Parse GNU properties. Return the property kind. If the property
1467 is corrupt, issue an error message and return property_corrupt. */
1468 enum elf_property_kind (*parse_gnu_properties) (bfd *, unsigned int,
1472 /* Merge GNU properties. Return TRUE if property is updated. */
1473 bfd_boolean (*merge_gnu_properties) (struct bfd_link_info *, bfd *,
1474 elf_property *, elf_property *);
1476 /* Set up GNU properties. */
1477 bfd *(*setup_gnu_properties) (struct bfd_link_info *);
1479 /* Encoding used for compact EH tables. */
1480 int (*compact_eh_encoding) (struct bfd_link_info *);
1482 /* Opcode representing no unwind. */
1483 int (*cant_unwind_opcode) (struct bfd_link_info *);
1485 /* This is non-zero if static TLS segments require a special alignment. */
1486 unsigned static_tls_alignment;
1488 /* Alignment for the PT_GNU_STACK segment. */
1489 unsigned stack_align;
1491 /* Flag bits to assign to a section of type SHT_STRTAB. */
1492 unsigned long elf_strtab_flags;
1494 /* This is TRUE if the linker should act like collect and gather
1495 global constructors and destructors by name. This is TRUE for
1496 MIPS ELF because the Irix 5 tools can not handle the .init
1498 unsigned collect : 1;
1500 /* This is TRUE if the linker should ignore changes to the type of a
1501 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1502 record undefined functions as STT_OBJECT although the definitions
1504 unsigned type_change_ok : 1;
1506 /* Whether the backend may use REL relocations. (Some backends use
1507 both REL and RELA relocations, and this flag is set for those
1509 unsigned may_use_rel_p : 1;
1511 /* Whether the backend may use RELA relocations. (Some backends use
1512 both REL and RELA relocations, and this flag is set for those
1514 unsigned may_use_rela_p : 1;
1516 /* Whether the default relocation type is RELA. If a backend with
1517 this flag set wants REL relocations for a particular section,
1518 it must note that explicitly. Similarly, if this flag is clear,
1519 and the backend wants RELA relocations for a particular
1521 unsigned default_use_rela_p : 1;
1523 /* True if PLT and copy relocations should be RELA by default. */
1524 unsigned rela_plts_and_copies_p : 1;
1526 /* Set if RELA relocations for a relocatable link can be handled by
1527 generic code. Backends that set this flag need do nothing in the
1528 backend relocate_section routine for relocatable linking. */
1529 unsigned rela_normal : 1;
1531 /* Set if DT_REL/DT_RELA/DT_RELSZ/DT_RELASZ should not include PLT
1533 unsigned dtrel_excludes_plt : 1;
1535 /* TRUE if addresses "naturally" sign extend. This is used when
1536 swapping in from Elf32 when BFD64. */
1537 unsigned sign_extend_vma : 1;
1539 unsigned want_got_plt : 1;
1540 unsigned plt_readonly : 1;
1541 unsigned want_plt_sym : 1;
1542 unsigned plt_not_loaded : 1;
1543 unsigned plt_alignment : 4;
1544 unsigned can_gc_sections : 1;
1545 unsigned can_refcount : 1;
1546 unsigned want_got_sym : 1;
1547 unsigned want_dynbss : 1;
1548 unsigned want_dynrelro : 1;
1550 /* Targets which do not support physical addressing often require
1551 that the p_paddr field in the section header to be set to zero.
1552 This field indicates whether this behavior is required. */
1553 unsigned want_p_paddr_set_to_zero : 1;
1555 /* Target has broken hardware and/or kernel that requires pages not
1556 to be mapped twice with different permissions. */
1557 unsigned no_page_alias : 1;
1559 /* True if an object file lacking a .note.GNU-stack section
1560 should be assumed to be requesting exec stack. At least one
1561 other file in the link needs to have a .note.GNU-stack section
1562 for a PT_GNU_STACK segment to be created. */
1563 unsigned default_execstack : 1;
1565 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize
1566 in length rather than sec->size in length, if sec->rawsize is
1567 non-zero and smaller than sec->size. */
1568 unsigned caches_rawsize : 1;
1570 /* Address of protected data defined in the shared library may be
1571 external, i.e., due to copy relocation. */
1572 unsigned extern_protected_data : 1;
1574 /* True if `_bfd_elf_link_renumber_dynsyms' must be called even for
1576 unsigned always_renumber_dynsyms : 1;
1578 /* True if the 32-bit Linux PRPSINFO structure's `pr_uid' and `pr_gid'
1579 members use a 16-bit data type. */
1580 unsigned linux_prpsinfo32_ugid16 : 1;
1582 /* True if the 64-bit Linux PRPSINFO structure's `pr_uid' and `pr_gid'
1583 members use a 16-bit data type. */
1584 unsigned linux_prpsinfo64_ugid16 : 1;
1587 /* Information about reloc sections associated with a bfd_elf_section_data
1589 struct bfd_elf_section_reloc_data
1591 /* The ELF header for the reloc section associated with this
1593 Elf_Internal_Shdr *hdr;
1594 /* The number of relocations currently assigned to HDR. */
1596 /* The ELF section number of the reloc section. Only used for an
1599 /* Used by the backend linker to store the symbol hash table entries
1600 associated with relocs against global symbols. */
1601 struct elf_link_hash_entry **hashes;
1604 /* Information stored for each BFD section in an ELF file. This
1605 structure is allocated by elf_new_section_hook. */
1607 struct bfd_elf_section_data
1609 /* The ELF header for this section. */
1610 Elf_Internal_Shdr this_hdr;
1612 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1613 struct flag_info *section_flag_info;
1615 /* Information about the REL and RELA reloc sections associated
1616 with this section, if any. */
1617 struct bfd_elf_section_reloc_data rel, rela;
1619 /* The ELF section number of this section. */
1622 /* Used by the backend linker when generating a shared library to
1623 record the dynamic symbol index for a section symbol
1624 corresponding to this section. A value of 0 means that there is
1625 no dynamic symbol for this section. */
1628 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1629 asection *linked_to;
1631 /* A pointer to the swapped relocs. If the section uses REL relocs,
1632 rather than RELA, all the r_addend fields will be zero. This
1633 pointer may be NULL. It is used by the backend linker. */
1634 Elf_Internal_Rela *relocs;
1636 /* A pointer to a linked list tracking dynamic relocs copied for
1640 /* A pointer to the bfd section used for dynamic relocs. */
1644 /* Group name, if this section is a member of a group. */
1647 /* Group signature sym, if this is the SHT_GROUP section. */
1648 struct bfd_symbol *id;
1651 /* For a member of a group, points to the SHT_GROUP section.
1652 NULL for the SHT_GROUP section itself and non-group sections. */
1653 asection *sec_group;
1655 /* A linked list of member sections in the group. Circular when used by
1656 the linker. For the SHT_GROUP section, points at first member. */
1657 asection *next_in_group;
1659 /* The FDEs associated with this section. The u.fde.next_in_section
1660 field acts as a chain pointer. */
1661 struct eh_cie_fde *fde_list;
1663 /* Link from a text section to its .eh_frame_entry section. */
1664 asection *eh_frame_entry;
1666 /* A pointer used for various section optimizations. */
1670 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1671 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1672 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1673 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1674 #define elf_section_info(sec) (elf_section_data(sec)->this_hdr.sh_info)
1675 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1676 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1677 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1678 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1679 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1680 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry)
1682 #define xvec_get_elf_backend_data(xvec) \
1683 ((const struct elf_backend_data *) (xvec)->backend_data)
1685 #define get_elf_backend_data(abfd) \
1686 xvec_get_elf_backend_data ((abfd)->xvec)
1688 /* The least object attributes (within an attributes subsection) known
1689 for any target. Some code assumes that the value 0 is not used and
1690 the field for that attribute can instead be used as a marker to
1691 indicate that attributes have been initialized. */
1692 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1694 /* The maximum number of known object attributes for any target. */
1695 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1697 /* The value of an object attribute. The type indicates whether the attribute
1698 holds and integer, a string, or both. It can also indicate that there can
1699 be no default (i.e. all values must be written to file, even zero). */
1701 typedef struct obj_attribute
1703 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1704 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1705 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1707 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1708 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1709 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1716 typedef struct obj_attribute_list
1718 struct obj_attribute_list *next;
1721 } obj_attribute_list;
1723 /* Object attributes may either be defined by the processor ABI, index
1724 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1725 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1726 #define OBJ_ATTR_PROC 0
1727 #define OBJ_ATTR_GNU 1
1728 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1729 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1731 /* The following object attribute tags are taken as generic, for all
1732 targets and for "gnu" where there is no target standard. */
1739 Tag_compatibility = 32
1742 /* The following struct stores information about every SystemTap section
1743 found in the object file. */
1746 struct sdt_note *next;
1751 /* tdata information grabbed from an elf core file. */
1752 struct core_elf_obj_tdata
1761 /* Extra tdata information held for output ELF BFDs. */
1762 struct output_elf_obj_tdata
1764 struct elf_segment_map *seg_map;
1765 struct elf_strtab_hash *strtab_ptr;
1767 /* STT_SECTION symbols for each section */
1768 asymbol **section_syms;
1770 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1772 asection *eh_frame_hdr;
1774 /* NT_GNU_BUILD_ID note type info. */
1777 bfd_boolean (*after_write_object_contents) (bfd *);
1782 /* Records the result of `get_program_header_size'. */
1783 bfd_size_type program_header_size;
1785 /* Used when laying out sections. */
1786 file_ptr next_file_pos;
1788 int num_section_syms;
1789 unsigned int shstrtab_section, strtab_section;
1791 /* Segment flags for the PT_GNU_STACK segment. */
1792 unsigned int stack_flags;
1794 /* This is set to TRUE if the object was created by the backend
1798 /* Used to determine if the e_flags field has been initialized */
1799 bfd_boolean flags_init;
1802 /* Indicate if the bfd contains symbols that have the STT_GNU_IFUNC
1803 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1804 field in the ELF header structure. */
1805 enum elf_gnu_symbols
1807 elf_gnu_symbol_none = 0,
1808 elf_gnu_symbol_any = 1 << 0,
1809 elf_gnu_symbol_ifunc = (elf_gnu_symbol_any | 1 << 1),
1810 elf_gnu_symbol_unique = (elf_gnu_symbol_any | 1 << 2),
1811 elf_gnu_symbol_all = (elf_gnu_symbol_ifunc | elf_gnu_symbol_unique)
1814 typedef struct elf_section_list
1816 Elf_Internal_Shdr hdr;
1818 struct elf_section_list * next;
1821 /* Some private data is stashed away for future use using the tdata pointer
1822 in the bfd structure. */
1824 struct elf_obj_tdata
1826 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1827 Elf_Internal_Shdr **elf_sect_ptr;
1828 Elf_Internal_Phdr *phdr;
1829 Elf_Internal_Shdr symtab_hdr;
1830 Elf_Internal_Shdr shstrtab_hdr;
1831 Elf_Internal_Shdr strtab_hdr;
1832 Elf_Internal_Shdr dynsymtab_hdr;
1833 Elf_Internal_Shdr dynstrtab_hdr;
1834 Elf_Internal_Shdr dynversym_hdr;
1835 Elf_Internal_Shdr dynverref_hdr;
1836 Elf_Internal_Shdr dynverdef_hdr;
1837 elf_section_list * symtab_shndx_list;
1838 bfd_vma gp; /* The gp value */
1839 unsigned int gp_size; /* The gp size */
1840 unsigned int num_elf_sections; /* elf_sect_ptr size */
1842 /* A mapping from external symbols to entries in the linker hash
1843 table, used when linking. This is indexed by the symbol index
1844 minus the sh_info field of the symbol table header. */
1845 struct elf_link_hash_entry **sym_hashes;
1847 /* Track usage and final offsets of GOT entries for local symbols.
1848 This array is indexed by symbol index. Elements are used
1849 identically to "got" in struct elf_link_hash_entry. */
1852 bfd_signed_vma *refcounts;
1854 struct got_entry **ents;
1857 /* The linker ELF emulation code needs to let the backend ELF linker
1858 know what filename should be used for a dynamic object if the
1859 dynamic object is found using a search. The emulation code then
1860 sometimes needs to know what name was actually used. Until the
1861 file has been added to the linker symbol table, this field holds
1862 the name the linker wants. After it has been added, it holds the
1863 name actually used, which will be the DT_SONAME entry if there is
1865 const char *dt_name;
1867 /* The linker emulation needs to know what audit libs
1868 are used by a dynamic object. */
1869 const char *dt_audit;
1871 /* Used by find_nearest_line entry point. */
1874 /* A place to stash dwarf1 info for this bfd. */
1875 struct dwarf1_debug *dwarf1_find_line_info;
1877 /* A place to stash dwarf2 info for this bfd. */
1878 void *dwarf2_find_line_info;
1880 /* Stash away info for yet another find line/function variant. */
1881 void *elf_find_function_cache;
1883 /* Number of symbol version definitions we are about to emit. */
1884 unsigned int cverdefs;
1886 /* Number of symbol version references we are about to emit. */
1887 unsigned int cverrefs;
1889 /* Symbol version definitions in external objects. */
1890 Elf_Internal_Verdef *verdef;
1892 /* Symbol version references to external objects. */
1893 Elf_Internal_Verneed *verref;
1895 /* A pointer to the .eh_frame section. */
1896 asection *eh_frame_section;
1898 /* Symbol buffer. */
1901 /* List of GNU properties. Will be updated by setup_gnu_properties
1902 after all input GNU properties are merged for output. */
1903 elf_property_list *properties;
1905 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1906 obj_attribute_list *other_obj_attributes[2];
1908 /* Linked-list containing information about every Systemtap section
1909 found in the object file. Each section corresponds to one entry
1911 struct sdt_note *sdt_note_head;
1913 Elf_Internal_Shdr **group_sect_ptr;
1916 /* Index into group_sect_ptr, updated by setup_group when finding a
1917 section's group. Used to optimize subsequent group searches. */
1918 unsigned int group_search_offset;
1920 unsigned int symtab_section, dynsymtab_section;
1921 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1923 /* An identifier used to distinguish different target
1924 specific extensions to this structure. */
1925 ENUM_BITFIELD (elf_target_id) object_id : 6;
1927 /* Whether a dyanmic object was specified normally on the linker
1928 command line, or was specified when --as-needed was in effect,
1929 or was found via a DT_NEEDED entry. */
1930 ENUM_BITFIELD (dynamic_lib_link_class) dyn_lib_class : 4;
1932 /* Whether if the bfd contains symbols that have the STT_GNU_IFUNC
1933 symbol type or STB_GNU_UNIQUE binding. */
1934 ENUM_BITFIELD (elf_gnu_symbols) has_gnu_symbols : 3;
1936 /* Whether if the bfd contains the GNU_PROPERTY_NO_COPY_ON_PROTECTED
1938 unsigned int has_no_copy_on_protected : 1;
1940 /* Irix 5 often screws up the symbol table, sorting local symbols
1941 after global symbols. This flag is set if the symbol table in
1942 this BFD appears to be screwed up. If it is, we ignore the
1943 sh_info field in the symbol table header, and always read all the
1945 unsigned int bad_symtab : 1;
1947 /* Information grabbed from an elf core file. */
1948 struct core_elf_obj_tdata *core;
1950 /* More information held for output ELF BFDs. */
1951 struct output_elf_obj_tdata *o;
1954 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1956 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1957 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size)
1958 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1959 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1960 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1961 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map)
1962 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos)
1963 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr)
1964 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker)
1965 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags)
1966 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr)
1967 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1968 #define elf_symtab_shndx_list(bfd) (elf_tdata(bfd) -> symtab_shndx_list)
1969 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section)
1970 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section)
1971 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1972 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1973 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1974 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1975 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1976 #define elf_eh_frame_section(bfd) \
1977 (elf_tdata(bfd) -> eh_frame_section)
1978 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms)
1979 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms)
1980 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1981 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1982 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1983 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1984 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1985 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1986 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1987 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1988 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1989 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1990 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1991 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1992 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init)
1993 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1994 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1995 #define elf_known_obj_attributes_proc(bfd) \
1996 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1997 #define elf_other_obj_attributes_proc(bfd) \
1998 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1999 #define elf_properties(bfd) (elf_tdata (bfd) -> properties)
2000 #define elf_has_no_copy_on_protected(bfd) \
2001 (elf_tdata(bfd) -> has_no_copy_on_protected)
2003 extern void _bfd_elf_swap_verdef_in
2004 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
2005 extern void _bfd_elf_swap_verdef_out
2006 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
2007 extern void _bfd_elf_swap_verdaux_in
2008 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
2009 extern void _bfd_elf_swap_verdaux_out
2010 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
2011 extern void _bfd_elf_swap_verneed_in
2012 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
2013 extern void _bfd_elf_swap_verneed_out
2014 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
2015 extern void _bfd_elf_swap_vernaux_in
2016 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
2017 extern void _bfd_elf_swap_vernaux_out
2018 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
2019 extern void _bfd_elf_swap_versym_in
2020 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
2021 extern void _bfd_elf_swap_versym_out
2022 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
2024 extern unsigned int _bfd_elf_section_from_bfd_section
2025 (bfd *, asection *);
2026 extern char *bfd_elf_string_from_elf_section
2027 (bfd *, unsigned, unsigned);
2028 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
2029 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
2030 Elf_External_Sym_Shndx *);
2031 extern const char *bfd_elf_sym_name
2032 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
2034 extern bfd_boolean _bfd_elf_copy_private_bfd_data
2036 extern bfd_boolean _bfd_elf_print_private_bfd_data
2038 const char * _bfd_elf_get_symbol_version_string
2039 (bfd *, asymbol *, bfd_boolean *);
2040 extern void bfd_elf_print_symbol
2041 (bfd *, void *, asymbol *, bfd_print_symbol_type);
2043 extern unsigned int _bfd_elf_eh_frame_address_size
2044 (bfd *, const asection *);
2045 extern bfd_byte _bfd_elf_encode_eh_address
2046 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
2047 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
2048 extern bfd_boolean _bfd_elf_can_make_relative
2049 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
2051 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
2052 (const struct bfd_link_info *, const asection *,
2053 const Elf_Internal_Rela *);
2054 extern bfd_vma _bfd_elf_rela_local_sym
2055 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
2056 extern bfd_vma _bfd_elf_rel_local_sym
2057 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
2058 extern bfd_vma _bfd_elf_section_offset
2059 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2061 extern unsigned long bfd_elf_hash
2063 extern unsigned long bfd_elf_gnu_hash
2066 extern bfd_reloc_status_type bfd_elf_generic_reloc
2067 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
2068 extern bfd_boolean bfd_elf_allocate_object
2069 (bfd *, size_t, enum elf_target_id);
2070 extern bfd_boolean bfd_elf_make_object
2072 extern bfd_boolean bfd_elf_mkcorefile
2074 extern bfd_boolean _bfd_elf_make_section_from_shdr
2075 (bfd *, Elf_Internal_Shdr *, const char *, int);
2076 extern bfd_boolean _bfd_elf_make_section_from_phdr
2077 (bfd *, Elf_Internal_Phdr *, int, const char *);
2078 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
2079 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
2080 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
2082 extern void _bfd_elf_link_hash_table_free
2084 extern void _bfd_elf_link_hash_copy_indirect
2085 (struct bfd_link_info *, struct elf_link_hash_entry *,
2086 struct elf_link_hash_entry *);
2087 extern void _bfd_elf_link_hash_hide_symbol
2088 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
2089 extern void _bfd_elf_link_hide_symbol
2090 (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *);
2091 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
2092 (struct bfd_link_info *, struct elf_link_hash_entry *);
2093 extern bfd_boolean _bfd_elf_link_hash_table_init
2094 (struct elf_link_hash_table *, bfd *,
2095 struct bfd_hash_entry *(*)
2096 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
2097 unsigned int, enum elf_target_id);
2098 extern bfd_boolean _bfd_elf_slurp_version_tables
2099 (bfd *, bfd_boolean);
2100 extern bfd_boolean _bfd_elf_merge_sections
2101 (bfd *, struct bfd_link_info *);
2102 extern bfd_boolean _bfd_elf_match_sections_by_type
2103 (bfd *, const asection *, bfd *, const asection *);
2104 extern bfd_boolean bfd_elf_is_group_section
2105 (bfd *, const struct bfd_section *);
2106 extern bfd_boolean _bfd_elf_section_already_linked
2107 (bfd *, asection *, struct bfd_link_info *);
2108 extern void bfd_elf_set_group_contents
2109 (bfd *, asection *, void *);
2110 extern unsigned int _bfd_elf_filter_global_symbols
2111 (bfd *, struct bfd_link_info *, asymbol **, long);
2112 extern asection *_bfd_elf_check_kept_section
2113 (asection *, struct bfd_link_info *);
2114 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
2115 extern void _bfd_elf_copy_link_hash_symbol_type
2116 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
2117 extern bfd_boolean _bfd_elf_size_group_sections
2118 (struct bfd_link_info *);
2119 extern bfd_boolean _bfd_elf_fixup_group_sections
2120 (bfd *, asection *);
2121 extern bfd_boolean _bfd_elf_copy_private_header_data
2123 extern bfd_boolean _bfd_elf_copy_private_symbol_data
2124 (bfd *, asymbol *, bfd *, asymbol *);
2125 #define _bfd_generic_init_private_section_data \
2126 _bfd_elf_init_private_section_data
2127 extern bfd_boolean _bfd_elf_init_private_section_data
2128 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
2129 extern bfd_boolean _bfd_elf_copy_private_section_data
2130 (bfd *, asection *, bfd *, asection *);
2131 extern bfd_boolean _bfd_elf_write_object_contents
2133 extern bfd_boolean _bfd_elf_write_corefile_contents
2135 extern bfd_boolean _bfd_elf_set_section_contents
2136 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
2137 extern long _bfd_elf_get_symtab_upper_bound
2139 extern long _bfd_elf_canonicalize_symtab
2140 (bfd *, asymbol **);
2141 extern long _bfd_elf_get_dynamic_symtab_upper_bound
2143 extern long _bfd_elf_canonicalize_dynamic_symtab
2144 (bfd *, asymbol **);
2145 extern long _bfd_elf_get_synthetic_symtab
2146 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
2147 extern long _bfd_elf_get_reloc_upper_bound
2149 extern long _bfd_elf_canonicalize_reloc
2150 (bfd *, sec_ptr, arelent **, asymbol **);
2151 extern asection * _bfd_elf_get_dynamic_reloc_section
2152 (bfd *, asection *, bfd_boolean);
2153 extern asection * _bfd_elf_make_dynamic_reloc_section
2154 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
2155 extern long _bfd_elf_get_dynamic_reloc_upper_bound
2157 extern long _bfd_elf_canonicalize_dynamic_reloc
2158 (bfd *, arelent **, asymbol **);
2159 extern asymbol *_bfd_elf_make_empty_symbol
2161 extern void _bfd_elf_get_symbol_info
2162 (bfd *, asymbol *, symbol_info *);
2163 extern bfd_boolean _bfd_elf_is_local_label_name
2164 (bfd *, const char *);
2165 extern alent *_bfd_elf_get_lineno
2167 extern bfd_boolean _bfd_elf_set_arch_mach
2168 (bfd *, enum bfd_architecture, unsigned long);
2169 extern bfd_boolean _bfd_elf_find_nearest_line
2170 (bfd *, asymbol **, asection *, bfd_vma,
2171 const char **, const char **, unsigned int *, unsigned int *);
2172 extern bfd_boolean _bfd_elf_find_line
2173 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
2174 extern bfd_boolean _bfd_elf_find_inliner_info
2175 (bfd *, const char **, const char **, unsigned int *);
2176 extern asymbol *_bfd_elf_find_function
2177 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **);
2178 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
2179 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
2180 extern int _bfd_elf_sizeof_headers
2181 (bfd *, struct bfd_link_info *);
2182 extern bfd_boolean _bfd_elf_new_section_hook
2183 (bfd *, asection *);
2184 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
2185 (const char *, const struct bfd_elf_special_section *, unsigned int);
2186 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
2187 (bfd *, asection *);
2189 extern bfd_boolean _bfd_elf_link_hide_sym_by_version
2190 (struct bfd_link_info *, struct elf_link_hash_entry *);
2192 /* If the target doesn't have reloc handling written yet: */
2193 extern bfd_boolean _bfd_elf_no_info_to_howto
2194 (bfd *, arelent *, Elf_Internal_Rela *);
2196 extern bfd_boolean bfd_section_from_shdr
2197 (bfd *, unsigned int shindex);
2198 extern bfd_boolean bfd_section_from_phdr
2199 (bfd *, Elf_Internal_Phdr *, int);
2201 extern int _bfd_elf_symbol_from_bfd_symbol
2202 (bfd *, asymbol **);
2204 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
2205 (struct sym_cache *, bfd *, unsigned long);
2206 extern asection *bfd_section_from_elf_index
2207 (bfd *, unsigned int);
2209 extern struct elf_strtab_hash * _bfd_elf_strtab_init
2211 extern void _bfd_elf_strtab_free
2212 (struct elf_strtab_hash *);
2213 extern size_t _bfd_elf_strtab_add
2214 (struct elf_strtab_hash *, const char *, bfd_boolean);
2215 extern void _bfd_elf_strtab_addref
2216 (struct elf_strtab_hash *, size_t);
2217 extern void _bfd_elf_strtab_delref
2218 (struct elf_strtab_hash *, size_t);
2219 extern unsigned int _bfd_elf_strtab_refcount
2220 (struct elf_strtab_hash *, size_t);
2221 extern void _bfd_elf_strtab_clear_all_refs
2222 (struct elf_strtab_hash *);
2223 extern void *_bfd_elf_strtab_save
2224 (struct elf_strtab_hash *);
2225 extern void _bfd_elf_strtab_restore
2226 (struct elf_strtab_hash *, void *);
2227 extern bfd_size_type _bfd_elf_strtab_size
2228 (struct elf_strtab_hash *);
2229 extern bfd_size_type _bfd_elf_strtab_offset
2230 (struct elf_strtab_hash *, size_t);
2231 extern bfd_boolean _bfd_elf_strtab_emit
2232 (bfd *, struct elf_strtab_hash *);
2233 extern void _bfd_elf_strtab_finalize
2234 (struct elf_strtab_hash *);
2236 extern bfd_boolean bfd_elf_parse_eh_frame_entries
2237 (bfd *, struct bfd_link_info *);
2238 extern bfd_boolean _bfd_elf_parse_eh_frame_entry
2239 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2240 extern void _bfd_elf_parse_eh_frame
2241 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2242 extern bfd_boolean _bfd_elf_end_eh_frame_parsing
2243 (struct bfd_link_info *info);
2245 extern bfd_boolean _bfd_elf_discard_section_eh_frame
2246 (bfd *, struct bfd_link_info *, asection *,
2247 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
2248 extern bfd_boolean _bfd_elf_adjust_eh_frame_global_symbol
2249 (struct elf_link_hash_entry *, void *);
2250 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
2251 (bfd *, struct bfd_link_info *);
2252 extern bfd_vma _bfd_elf_eh_frame_section_offset
2253 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2254 extern bfd_boolean _bfd_elf_write_section_eh_frame
2255 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2256 bfd_boolean _bfd_elf_write_section_eh_frame_entry
2257 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2258 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *);
2259 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
2260 (bfd *, struct bfd_link_info *);
2261 extern bfd_boolean _bfd_elf_eh_frame_present
2262 (struct bfd_link_info *);
2263 extern bfd_boolean _bfd_elf_eh_frame_entry_present
2264 (struct bfd_link_info *);
2265 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
2266 (struct bfd_link_info *);
2268 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
2270 extern long _bfd_elf_link_lookup_local_dynindx
2271 (struct bfd_link_info *, bfd *, long);
2272 extern bfd_boolean _bfd_elf_compute_section_file_positions
2273 (bfd *, struct bfd_link_info *);
2274 extern file_ptr _bfd_elf_assign_file_position_for_section
2275 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
2277 extern bfd_boolean _bfd_elf_validate_reloc
2280 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
2281 (bfd *, struct bfd_link_info *);
2282 extern bfd_boolean _bfd_elf_omit_section_dynsym_default
2283 (bfd *, struct bfd_link_info *, asection *);
2284 extern bfd_boolean _bfd_elf_omit_section_dynsym_all
2285 (bfd *, struct bfd_link_info *, asection *);
2286 extern bfd_boolean _bfd_elf_create_dynamic_sections
2287 (bfd *, struct bfd_link_info *);
2288 extern bfd_boolean _bfd_elf_create_got_section
2289 (bfd *, struct bfd_link_info *);
2290 extern asection *_bfd_elf_section_for_symbol
2291 (struct elf_reloc_cookie *, unsigned long, bfd_boolean);
2292 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2293 (bfd *, struct bfd_link_info *, asection *, const char *);
2294 extern void _bfd_elf_init_1_index_section
2295 (bfd *, struct bfd_link_info *);
2296 extern void _bfd_elf_init_2_index_sections
2297 (bfd *, struct bfd_link_info *);
2299 extern bfd_boolean _bfd_elfcore_make_pseudosection
2300 (bfd *, char *, size_t, ufile_ptr);
2301 extern char *_bfd_elfcore_strndup
2302 (bfd *, char *, size_t);
2304 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2305 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2307 extern bfd_boolean _bfd_elf_link_output_relocs
2308 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2309 struct elf_link_hash_entry **);
2311 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2312 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *);
2314 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2315 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2317 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2318 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2320 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2321 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2323 extern bfd_boolean _bfd_elf_setup_sections
2326 extern struct bfd_link_hash_entry *bfd_elf_define_start_stop
2327 (struct bfd_link_info *, const char *, asection *);
2329 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *);
2331 extern const bfd_target *bfd_elf32_object_p
2333 extern const bfd_target *bfd_elf32_core_file_p
2335 extern char *bfd_elf32_core_file_failing_command
2337 extern int bfd_elf32_core_file_failing_signal
2339 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2341 extern int bfd_elf32_core_file_pid
2344 extern bfd_boolean bfd_elf32_swap_symbol_in
2345 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2346 extern void bfd_elf32_swap_symbol_out
2347 (bfd *, const Elf_Internal_Sym *, void *, void *);
2348 extern void bfd_elf32_swap_reloc_in
2349 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2350 extern void bfd_elf32_swap_reloc_out
2351 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2352 extern void bfd_elf32_swap_reloca_in
2353 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2354 extern void bfd_elf32_swap_reloca_out
2355 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2356 extern void bfd_elf32_swap_phdr_in
2357 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2358 extern void bfd_elf32_swap_phdr_out
2359 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2360 extern void bfd_elf32_swap_dyn_in
2361 (bfd *, const void *, Elf_Internal_Dyn *);
2362 extern void bfd_elf32_swap_dyn_out
2363 (bfd *, const Elf_Internal_Dyn *, void *);
2364 extern long bfd_elf32_slurp_symbol_table
2365 (bfd *, asymbol **, bfd_boolean);
2366 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2368 extern int bfd_elf32_write_out_phdrs
2369 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2370 extern bfd_boolean bfd_elf32_checksum_contents
2371 (bfd * , void (*) (const void *, size_t, void *), void *);
2372 extern void bfd_elf32_write_relocs
2373 (bfd *, asection *, void *);
2374 extern bfd_boolean bfd_elf32_slurp_reloc_table
2375 (bfd *, asection *, asymbol **, bfd_boolean);
2377 extern const bfd_target *bfd_elf64_object_p
2379 extern const bfd_target *bfd_elf64_core_file_p
2381 extern char *bfd_elf64_core_file_failing_command
2383 extern int bfd_elf64_core_file_failing_signal
2385 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2387 extern int bfd_elf64_core_file_pid
2390 extern bfd_boolean bfd_elf64_swap_symbol_in
2391 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2392 extern void bfd_elf64_swap_symbol_out
2393 (bfd *, const Elf_Internal_Sym *, void *, void *);
2394 extern void bfd_elf64_swap_reloc_in
2395 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2396 extern void bfd_elf64_swap_reloc_out
2397 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2398 extern void bfd_elf64_swap_reloca_in
2399 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2400 extern void bfd_elf64_swap_reloca_out
2401 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2402 extern void bfd_elf64_swap_phdr_in
2403 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2404 extern void bfd_elf64_swap_phdr_out
2405 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2406 extern void bfd_elf64_swap_dyn_in
2407 (bfd *, const void *, Elf_Internal_Dyn *);
2408 extern void bfd_elf64_swap_dyn_out
2409 (bfd *, const Elf_Internal_Dyn *, void *);
2410 extern long bfd_elf64_slurp_symbol_table
2411 (bfd *, asymbol **, bfd_boolean);
2412 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2414 extern int bfd_elf64_write_out_phdrs
2415 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2416 extern bfd_boolean bfd_elf64_checksum_contents
2417 (bfd * , void (*) (const void *, size_t, void *), void *);
2418 extern void bfd_elf64_write_relocs
2419 (bfd *, asection *, void *);
2420 extern bfd_boolean bfd_elf64_slurp_reloc_table
2421 (bfd *, asection *, asymbol **, bfd_boolean);
2423 extern bfd_boolean _bfd_elf_default_relocs_compatible
2424 (const bfd_target *, const bfd_target *);
2426 extern bfd_boolean _bfd_elf_relocs_compatible
2427 (const bfd_target *, const bfd_target *);
2428 extern bfd_boolean _bfd_elf_notice_as_needed
2429 (bfd *, struct bfd_link_info *, enum notice_asneeded_action);
2431 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2432 (bfd *, struct bfd_link_info *, const char *);
2433 extern bfd_boolean bfd_elf_link_add_symbols
2434 (bfd *, struct bfd_link_info *);
2435 extern bfd_boolean _bfd_elf_add_dynamic_entry
2436 (struct bfd_link_info *, bfd_vma, bfd_vma);
2437 extern bfd_boolean _bfd_elf_link_check_relocs
2438 (bfd *, struct bfd_link_info *);
2440 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2441 (struct bfd_link_info *, struct elf_link_hash_entry *);
2443 extern int bfd_elf_link_record_local_dynamic_symbol
2444 (struct bfd_link_info *, bfd *, long);
2446 extern bfd_boolean _bfd_elf_close_and_cleanup
2449 extern bfd_boolean _bfd_elf_common_definition
2450 (Elf_Internal_Sym *);
2452 extern unsigned int _bfd_elf_common_section_index
2455 extern asection *_bfd_elf_common_section
2458 extern bfd_vma _bfd_elf_default_got_elt_size
2459 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2462 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2463 (bfd *, arelent *, struct bfd_symbol *, void *,
2464 asection *, bfd *, char **);
2466 extern bfd_boolean bfd_elf_final_link
2467 (bfd *, struct bfd_link_info *);
2469 extern void _bfd_elf_gc_keep
2470 (struct bfd_link_info *info);
2472 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2473 (struct elf_link_hash_entry *h, void *inf);
2475 extern bfd_boolean bfd_elf_gc_sections
2476 (bfd *, struct bfd_link_info *);
2478 extern bfd_boolean bfd_elf_gc_record_vtinherit
2479 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2481 extern bfd_boolean bfd_elf_gc_record_vtentry
2482 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2484 extern asection *_bfd_elf_gc_mark_hook
2485 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2486 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2488 extern asection *_bfd_elf_gc_mark_rsec
2489 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2490 struct elf_reloc_cookie *, bfd_boolean *);
2492 extern bfd_boolean _bfd_elf_gc_mark_reloc
2493 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2494 struct elf_reloc_cookie *);
2496 extern bfd_boolean _bfd_elf_gc_mark_fdes
2497 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2498 struct elf_reloc_cookie *);
2500 extern bfd_boolean _bfd_elf_gc_mark
2501 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2503 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2504 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2506 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2507 (bfd *, struct bfd_link_info *);
2509 extern bfd_boolean bfd_elf_gc_common_final_link
2510 (bfd *, struct bfd_link_info *);
2512 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2515 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2516 (bfd *, asection *);
2518 extern bfd_boolean _bfd_elf_map_sections_to_segments
2519 (bfd *, struct bfd_link_info *);
2521 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2523 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2526 extern asection *_bfd_elf_plt_get_reloc_section (bfd *, const char *);
2528 extern int bfd_elf_get_default_section_type (flagword);
2530 extern bfd_boolean bfd_elf_lookup_section_flags
2531 (struct bfd_link_info *, struct flag_info *, asection *);
2533 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2534 (bfd * abfd, asection * section);
2536 /* PowerPC @tls opcode transform/validate. */
2537 extern unsigned int _bfd_elf_ppc_at_tls_transform
2538 (unsigned int, unsigned int);
2539 /* PowerPC @tprel opcode transform/validate. */
2540 extern unsigned int _bfd_elf_ppc_at_tprel_transform
2541 (unsigned int, unsigned int);
2542 /* PowerPC elf_object_p tweak. */
2543 extern bfd_boolean _bfd_elf_ppc_set_arch (bfd *);
2544 /* PowerPC .gnu.attributes handling common to both 32-bit and 64-bit. */
2545 extern void _bfd_elf_ppc_merge_fp_attributes (bfd *, struct bfd_link_info *);
2547 /* Exported interface for writing elf corefile notes. */
2548 extern char *elfcore_write_note
2549 (bfd *, char *, int *, const char *, int, const void *, int);
2550 extern char *elfcore_write_prpsinfo
2551 (bfd *, char *, int *, const char *, const char *);
2552 extern char *elfcore_write_prstatus
2553 (bfd *, char *, int *, long, int, const void *);
2554 extern char * elfcore_write_pstatus
2555 (bfd *, char *, int *, long, int, const void *);
2556 extern char *elfcore_write_prfpreg
2557 (bfd *, char *, int *, const void *, int);
2558 extern char *elfcore_write_prxfpreg
2559 (bfd *, char *, int *, const void *, int);
2560 extern char *elfcore_write_xstatereg
2561 (bfd *, char *, int *, const void *, int);
2562 extern char *elfcore_write_ppc_vmx
2563 (bfd *, char *, int *, const void *, int);
2564 extern char *elfcore_write_ppc_vsx
2565 (bfd *, char *, int *, const void *, int);
2566 extern char *elfcore_write_s390_timer
2567 (bfd *, char *, int *, const void *, int);
2568 extern char *elfcore_write_s390_todcmp
2569 (bfd *, char *, int *, const void *, int);
2570 extern char *elfcore_write_s390_todpreg
2571 (bfd *, char *, int *, const void *, int);
2572 extern char *elfcore_write_s390_ctrs
2573 (bfd *, char *, int *, const void *, int);
2574 extern char *elfcore_write_s390_prefix
2575 (bfd *, char *, int *, const void *, int);
2576 extern char *elfcore_write_s390_last_break
2577 (bfd *, char *, int *, const void *, int);
2578 extern char *elfcore_write_s390_system_call
2579 (bfd *, char *, int *, const void *, int);
2580 extern char *elfcore_write_s390_tdb
2581 (bfd *, char *, int *, const void *, int);
2582 extern char *elfcore_write_s390_vxrs_low
2583 (bfd *, char *, int *, const void *, int);
2584 extern char *elfcore_write_s390_vxrs_high
2585 (bfd *, char *, int *, const void *, int);
2586 extern char *elfcore_write_s390_gs_cb
2587 (bfd *, char *, int *, const void *, int);
2588 extern char *elfcore_write_s390_gs_bc
2589 (bfd *, char *, int *, const void *, int);
2590 extern char *elfcore_write_arm_vfp
2591 (bfd *, char *, int *, const void *, int);
2592 extern char *elfcore_write_aarch_tls
2593 (bfd *, char *, int *, const void *, int);
2594 extern char *elfcore_write_aarch_hw_break
2595 (bfd *, char *, int *, const void *, int);
2596 extern char *elfcore_write_aarch_hw_watch
2597 (bfd *, char *, int *, const void *, int);
2598 extern char *elfcore_write_lwpstatus
2599 (bfd *, char *, int *, long, int, const void *);
2600 extern char *elfcore_write_register_note
2601 (bfd *, char *, int *, const char *, const void *, int);
2603 /* Internal structure which holds information to be included in the
2604 PRPSINFO section of Linux core files.
2606 This is an "internal" structure in the sense that it should be used
2607 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2608 function), so things like endianess shouldn't be an issue. This
2609 structure will eventually be converted in one of the
2610 `elf_external_linux_*' structures and written out to an output bfd
2611 by one of the functions declared below. */
2613 struct elf_internal_linux_prpsinfo
2615 char pr_state; /* Numeric process state. */
2616 char pr_sname; /* Char for pr_state. */
2617 char pr_zomb; /* Zombie. */
2618 char pr_nice; /* Nice val. */
2619 unsigned long pr_flag; /* Flags. */
2620 unsigned int pr_uid;
2621 unsigned int pr_gid;
2622 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2623 char pr_fname[16 + 1]; /* Filename of executable. */
2624 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2627 /* Linux/most 32-bit archs. */
2628 extern char *elfcore_write_linux_prpsinfo32
2629 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2631 /* Linux/most 64-bit archs. */
2632 extern char *elfcore_write_linux_prpsinfo64
2633 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2635 extern bfd *_bfd_elf32_bfd_from_remote_memory
2636 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2637 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2638 extern bfd *_bfd_elf64_bfd_from_remote_memory
2639 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2640 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2642 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2643 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2644 extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int);
2645 extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int);
2646 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2647 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2648 extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *);
2649 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2650 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2651 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int,
2652 unsigned int, const char *);
2653 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2654 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2657 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2658 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2659 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int);
2660 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2661 extern bfd_boolean _bfd_elf_merge_object_attributes
2662 (bfd *, struct bfd_link_info *);
2663 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2664 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2665 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2667 extern bfd_boolean _bfd_elf_parse_gnu_properties
2668 (bfd *, Elf_Internal_Note *);
2669 extern elf_property * _bfd_elf_get_property
2670 (bfd *, unsigned int, unsigned int);
2671 extern bfd *_bfd_elf_link_setup_gnu_properties
2672 (struct bfd_link_info *);
2674 /* The linker may need to keep track of the number of relocs that it
2675 decides to copy as dynamic relocs in check_relocs for each symbol.
2676 This is so that it can later discard them if they are found to be
2677 unnecessary. We can store the information in a field extending the
2678 regular ELF linker hash table. */
2680 struct elf_dyn_relocs
2682 struct elf_dyn_relocs *next;
2684 /* The input section of the reloc. */
2687 /* Total number of relocs copied for the input section. */
2688 bfd_size_type count;
2690 /* Number of pc-relative relocs copied for the input section. */
2691 bfd_size_type pc_count;
2694 extern bfd_boolean _bfd_elf_create_ifunc_sections
2695 (bfd *, struct bfd_link_info *);
2696 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2697 (struct bfd_link_info *, struct elf_link_hash_entry *,
2698 struct elf_dyn_relocs **, bfd_boolean *, unsigned int,
2699 unsigned int, unsigned int, bfd_boolean);
2701 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2702 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2704 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2705 extern bfd_vma elf64_r_sym (bfd_vma);
2706 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2707 extern bfd_vma elf32_r_sym (bfd_vma);
2709 /* Large common section. */
2710 extern asection _bfd_elf_large_com_section;
2712 /* Hash for local symbol with the first section id, ID, in the input
2713 file and the local symbol index, SYM. */
2714 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2715 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2716 ^ (SYM) ^ ((ID) >> 16))
2718 /* This is the condition under which finish_dynamic_symbol will be called.
2719 If our finish_dynamic_symbol isn't called, we'll need to do something
2720 about initializing any .plt and .got entries in relocate_section. */
2721 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2723 && ((SHARED) || !(H)->forced_local) \
2724 && ((H)->dynindx != -1 || (H)->forced_local))
2726 /* This macro is to avoid lots of duplicated code in the body
2727 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2728 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2729 r_symndx, symtab_hdr, sym_hashes, \
2730 h, sec, relocation, \
2731 unresolved_reloc, warned, ignored) \
2734 /* It seems this can happen with erroneous or unsupported \
2735 input (mixing a.out and elf in an archive, for example.) */ \
2736 if (sym_hashes == NULL) \
2739 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2741 if (info->wrap_hash != NULL \
2742 && (input_section->flags & SEC_DEBUGGING) != 0) \
2743 h = ((struct elf_link_hash_entry *) \
2744 unwrap_hash_lookup (info, input_bfd, &h->root)); \
2746 while (h->root.type == bfd_link_hash_indirect \
2747 || h->root.type == bfd_link_hash_warning) \
2748 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2752 unresolved_reloc = FALSE; \
2754 if (h->root.type == bfd_link_hash_defined \
2755 || h->root.type == bfd_link_hash_defweak) \
2757 sec = h->root.u.def.section; \
2759 || sec->output_section == NULL) \
2760 /* Set a flag that will be cleared later if we find a \
2761 relocation value for this symbol. output_section \
2762 is typically NULL for symbols satisfied by a shared \
2764 unresolved_reloc = TRUE; \
2766 relocation = (h->root.u.def.value \
2767 + sec->output_section->vma \
2768 + sec->output_offset); \
2770 else if (h->root.type == bfd_link_hash_undefweak) \
2772 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2773 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2775 else if (!bfd_link_relocatable (info)) \
2778 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2779 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2780 (*info->callbacks->undefined_symbol) (info, \
2781 h->root.root.string, \
2784 rel->r_offset, err); \
2787 (void) unresolved_reloc; \
2793 /* This macro is to avoid lots of duplicated code in the body of the
2794 loop over relocations in xxx_relocate_section() in the various
2797 Handle relocations against symbols from removed linkonce sections,
2798 or sections discarded by a linker script. When doing a relocatable
2799 link, we remove such relocations. Otherwise, we just want the
2800 section contents zeroed and avoid any special processing. */
2801 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2802 rel, count, relend, \
2803 howto, index, contents) \
2806 _bfd_clear_contents (howto, input_bfd, input_section, \
2807 contents + rel[index].r_offset); \
2809 if (bfd_link_relocatable (info) \
2810 && (input_section->flags & SEC_DEBUGGING)) \
2812 /* Only remove relocations in debug sections since other \
2813 sections may require relocations. */ \
2814 Elf_Internal_Shdr *rel_hdr; \
2816 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2818 /* Avoid empty output section. */ \
2819 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2821 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2822 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2823 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2825 memmove (rel, rel + count, \
2826 (relend - rel - count) * sizeof (*rel)); \
2828 input_section->reloc_count -= count; \
2835 for (i_ = 0; i_ < count; i_++) \
2837 rel[i_].r_info = 0; \
2838 rel[i_].r_addend = 0; \
2844 /* Will a symbol be bound to the definition within the shared
2845 library, if any. A unique symbol can never be bound locally. */
2846 #define SYMBOLIC_BIND(INFO, H) \
2847 (!(H)->unique_global \
2848 && ((INFO)->symbolic \
2849 || (H)->start_stop \
2850 || ((INFO)->dynamic && !(H)->dynamic)))
2855 #endif /* _LIBELF_H_ */