1 /* BFD back-end data structures for ELF files.
2 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
27 #include "elf/common.h"
28 #include "elf/external.h"
29 #include "elf/internal.h"
32 /* The number of entries in a section is its size divided by the size
33 of a single entry. This is normally only applicable to reloc and
34 symbol table sections.
35 PR 9934: It is possible to have relocations that do not refer to
36 symbols, thus it is also possible to have a relocation section in
37 an object file, but no symbol table. */
38 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
40 /* If size isn't specified as 64 or 32, NAME macro should fail. */
43 #define NAME(x, y) x ## 64 ## _ ## y
46 #define NAME(x, y) x ## 32 ## _ ## y
51 #define NAME(x, y) x ## NOSIZE ## _ ## y
54 #define ElfNAME(X) NAME(Elf,X)
55 #define elfNAME(X) NAME(elf,X)
57 /* Information held for an ELF symbol. The first field is the
58 corresponding asymbol. Every symbol is an ELF file is actually a
59 pointer to this structure, although it is often handled as a
60 pointer to an asymbol. */
66 /* ELF symbol information. */
67 Elf_Internal_Sym internal_elf_sym;
68 /* Backend specific information. */
71 unsigned int hppa_arg_reloc;
77 /* Version information. This is from an Elf_Internal_Versym
78 structure in a SHT_GNU_versym section. It is zero if there is no
79 version information. */
80 unsigned short version;
84 struct elf_strtab_hash;
90 bfd_signed_vma refcount;
92 struct got_entry *glist;
93 struct plt_entry *plist;
96 struct elf_link_virtual_table_entry
98 /* Virtual table entry use information. This array is nominally of size
99 size/sizeof(target_void_pointer), though we have to be able to assume
100 and track a size while the symbol is still undefined. It is indexed
101 via offset/sizeof(target_void_pointer). */
105 /* Virtual table derivation info. */
106 struct elf_link_hash_entry *parent;
109 /* ELF linker hash table entries. */
111 struct elf_link_hash_entry
113 struct bfd_link_hash_entry root;
115 /* Symbol index in output file. This is initialized to -1. It is
116 set to -2 if the symbol is used by a reloc. */
119 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
120 -1 if this is not a dynamic symbol. */
121 /* ??? Note that this is consistently used as a synonym for tests
122 against whether we can perform various simplifying transformations
123 to the code. (E.g. changing a pc-relative jump to a PLT entry
124 into a pc-relative jump to the target function.) That test, which
125 is often relatively complex, and someplaces wrong or incomplete,
126 should really be replaced by a predicate in elflink.c.
128 End result: this field -1 does not indicate that the symbol is
129 not in the dynamic symbol table, but rather that the symbol is
130 not visible outside this DSO. */
133 /* If this symbol requires an entry in the global offset table, the
134 processor specific backend uses this field to track usage and
135 final offset. Two schemes are supported: The first assumes that
136 a symbol may only have one GOT entry, and uses REFCOUNT until
137 size_dynamic_sections, at which point the contents of the .got is
138 fixed. Afterward, if OFFSET is -1, then the symbol does not
139 require a global offset table entry. The second scheme allows
140 multiple GOT entries per symbol, managed via a linked list
141 pointed to by GLIST. */
142 union gotplt_union got;
144 /* Same, but tracks a procedure linkage table entry. */
145 union gotplt_union plt;
150 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
151 unsigned int type : 8;
153 /* Symbol st_other value, symbol visibility. */
154 unsigned int other : 8;
156 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */
157 unsigned int target_internal : 8;
159 /* Symbol is referenced by a non-shared object (other than the object
160 in which it is defined). */
161 unsigned int ref_regular : 1;
162 /* Symbol is defined by a non-shared object. */
163 unsigned int def_regular : 1;
164 /* Symbol is referenced by a shared object. */
165 unsigned int ref_dynamic : 1;
166 /* Symbol is defined by a shared object. */
167 unsigned int def_dynamic : 1;
168 /* Symbol has a non-weak reference from a non-shared object (other than
169 the object in which it is defined). */
170 unsigned int ref_regular_nonweak : 1;
171 /* Dynamic symbol has been adjustd. */
172 unsigned int dynamic_adjusted : 1;
173 /* Symbol needs a copy reloc. */
174 unsigned int needs_copy : 1;
175 /* Symbol needs a procedure linkage table entry. */
176 unsigned int needs_plt : 1;
177 /* Symbol appears in a non-ELF input file. */
178 unsigned int non_elf : 1;
179 /* Symbol should be marked as hidden in the version information. */
180 unsigned int hidden : 1;
181 /* Symbol was forced to local scope due to a version script file. */
182 unsigned int forced_local : 1;
183 /* Symbol was forced to be dynamic due to a version script file. */
184 unsigned int dynamic : 1;
185 /* Symbol was marked during garbage collection. */
186 unsigned int mark : 1;
187 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
188 not currently set by all the backends. */
189 unsigned int non_got_ref : 1;
190 /* Symbol has a definition in a shared object.
191 FIXME: There is no real need for this field if def_dynamic is never
192 cleared and all places that test def_dynamic also test def_regular. */
193 unsigned int dynamic_def : 1;
194 /* Symbol has a non-weak reference from a shared object. */
195 unsigned int ref_dynamic_nonweak : 1;
196 /* Symbol is referenced with a relocation where C/C++ pointer equality
198 unsigned int pointer_equality_needed : 1;
199 /* Symbol is a unique global symbol. */
200 unsigned int unique_global : 1;
202 /* String table index in .dynstr if this is a dynamic symbol. */
203 unsigned long dynstr_index;
207 /* If this is a weak defined symbol from a dynamic object, this
208 field points to a defined symbol with the same value, if there is
209 one. Otherwise it is NULL. */
210 struct elf_link_hash_entry *weakdef;
212 /* Hash value of the name computed using the ELF hash function.
213 Used part way through size_dynamic_sections, after we've finished
215 unsigned long elf_hash_value;
218 /* Version information. */
221 /* This field is used for a symbol which is not defined in a
222 regular object. It points to the version information read in
223 from the dynamic object. */
224 Elf_Internal_Verdef *verdef;
225 /* This field is used for a symbol which is defined in a regular
226 object. It is set up in size_dynamic_sections. It points to
227 the version information we should write out for this symbol. */
228 struct bfd_elf_version_tree *vertree;
231 struct elf_link_virtual_table_entry *vtable;
234 /* Will references to this symbol always reference the symbol
236 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
237 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
239 /* Will _calls_ to this symbol always call the version in this object? */
240 #define SYMBOL_CALLS_LOCAL(INFO, H) \
241 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
243 /* Common symbols that are turned into definitions don't have the
244 DEF_REGULAR flag set, so they might appear to be undefined. */
245 #define ELF_COMMON_DEF_P(H) \
247 && !(H)->def_dynamic \
248 && (H)->root.type == bfd_link_hash_defined)
250 /* Records local symbols to be emitted in the dynamic symbol table. */
252 struct elf_link_local_dynamic_entry
254 struct elf_link_local_dynamic_entry *next;
256 /* The input bfd this symbol came from. */
259 /* The index of the local symbol being copied. */
262 /* The index in the outgoing dynamic symbol table. */
265 /* A copy of the input symbol. */
266 Elf_Internal_Sym isym;
269 struct elf_link_loaded_list
271 struct elf_link_loaded_list *next;
275 /* Structures used by the eh_frame optimization code. */
280 /* If REMOVED == 1, this is the CIE that the FDE originally used.
281 The CIE belongs to the same .eh_frame input section as the FDE.
283 If REMOVED == 0, this is the CIE that we have chosen to use for
284 the output FDE. The CIE's REMOVED field is also 0, but the CIE
285 might belong to a different .eh_frame input section from the FDE. */
286 struct eh_cie_fde *cie_inf;
287 struct eh_cie_fde *next_for_section;
290 /* CIEs have three states:
292 - REMOVED && !MERGED: Slated for removal because we haven't yet
293 proven that an FDE needs it. FULL_CIE, if nonnull, points to
294 more detailed information about the CIE.
296 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
297 which may not belong to the same input section.
299 - !REMOVED: We have decided to keep this CIE. SEC is the
300 .eh_frame input section that contains the CIE. */
302 struct cie *full_cie;
303 struct eh_cie_fde *merged_with;
307 /* The offset of the personality data from the start of the CIE,
308 or 0 if the CIE doesn't have any. */
309 unsigned int personality_offset : 8;
311 /* True if we have marked relocations associated with this CIE. */
312 unsigned int gc_mark : 1;
314 /* True if we have decided to turn an absolute LSDA encoding into
315 a PC-relative one. */
316 unsigned int make_lsda_relative : 1;
318 /* True if we have decided to turn an absolute personality
319 encoding into a PC-relative one. */
320 unsigned int make_per_encoding_relative : 1;
322 /* True if the CIE contains personality data and if that
323 data uses a PC-relative encoding. Always true when
324 make_per_encoding_relative is. */
325 unsigned int per_encoding_relative : 1;
327 /* True if we need to add an 'R' (FDE encoding) entry to the
328 CIE's augmentation data. */
329 unsigned int add_fde_encoding : 1;
331 /* True if we have merged this CIE with another. */
332 unsigned int merged : 1;
335 unsigned int pad1 : 18;
338 unsigned int reloc_index;
341 unsigned int new_offset;
342 unsigned int fde_encoding : 8;
343 unsigned int lsda_encoding : 8;
344 unsigned int lsda_offset : 8;
346 /* True if this entry represents a CIE, false if it represents an FDE. */
347 unsigned int cie : 1;
349 /* True if this entry is currently marked for removal. */
350 unsigned int removed : 1;
352 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
353 augmentation data, and an associated byte to each of the CIE's FDEs. */
354 unsigned int add_augmentation_size : 1;
356 /* True if we have decided to convert absolute FDE relocations into
357 relative ones. This applies to the first relocation in the FDE,
358 which is against the code that the FDE describes. */
359 unsigned int make_relative : 1;
362 unsigned int pad1 : 4;
364 unsigned int *set_loc;
367 struct eh_frame_sec_info
371 struct eh_cie_fde entry[1];
374 struct eh_frame_array_ent
382 struct eh_frame_hdr_info
386 unsigned int fde_count, array_count;
387 struct eh_frame_array_ent *array;
388 /* TRUE if we should try to merge CIEs between input sections. */
389 bfd_boolean merge_cies;
390 /* TRUE if all .eh_frames have been parsd. */
391 bfd_boolean parsed_eh_frames;
392 /* TRUE if .eh_frame_hdr should contain the sorted search table.
393 We build it if we successfully read all .eh_frame input sections
394 and recognize them. */
398 /* Enum used to identify target specific extensions to the elf_obj_tdata
399 and elf_link_hash_table structures. Note the enums deliberately start
400 from 1 so that we can detect an uninitialized field. The generic value
401 is last so that additions to this enum do not need to modify more than
405 AARCH64_ELF_DATA = 1,
440 /* ELF linker hash table. */
442 struct elf_link_hash_table
444 struct bfd_link_hash_table root;
446 /* An identifier used to distinguish different target
447 specific extensions to this structure. */
448 enum elf_target_id hash_table_id;
450 /* Whether we have created the special dynamic sections required
451 when linking against or generating a shared object. */
452 bfd_boolean dynamic_sections_created;
454 /* True if this target has relocatable executables, so needs dynamic
456 bfd_boolean is_relocatable_executable;
458 /* The BFD used to hold special sections created by the linker.
459 This will be the first BFD found which requires these sections to
463 /* The value to use when initialising got.refcount/offset and
464 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
465 the values are refcounts. Set to init_got_offset/init_plt_offset
466 in size_dynamic_sections when the values may be offsets. */
467 union gotplt_union init_got_refcount;
468 union gotplt_union init_plt_refcount;
470 /* The value to use for got.refcount/offset and plt.refcount/offset
471 when the values may be offsets. Normally (bfd_vma) -1. */
472 union gotplt_union init_got_offset;
473 union gotplt_union init_plt_offset;
475 /* The number of symbols found in the link which must be put into
476 the .dynsym section. */
477 bfd_size_type dynsymcount;
479 /* The string table of dynamic symbols, which becomes the .dynstr
481 struct elf_strtab_hash *dynstr;
483 /* The number of buckets in the hash table in the .hash section.
484 This is based on the number of dynamic symbols. */
485 bfd_size_type bucketcount;
487 /* A linked list of DT_NEEDED names found in dynamic objects
488 included in the link. */
489 struct bfd_link_needed_list *needed;
491 /* Sections in the output bfd that provides a section symbol
492 to be used by relocations emitted against local symbols.
493 Most targets will not use data_index_section. */
494 asection *text_index_section;
495 asection *data_index_section;
497 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
498 struct elf_link_hash_entry *hgot;
500 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
501 struct elf_link_hash_entry *hplt;
503 /* The _DYNAMIC symbol. */
504 struct elf_link_hash_entry *hdynamic;
506 /* A pointer to information used to merge SEC_MERGE sections. */
509 /* Used to link stabs in sections. */
510 struct stab_info stab_info;
512 /* Used by eh_frame code when editing .eh_frame. */
513 struct eh_frame_hdr_info eh_info;
515 /* A linked list of local symbols to be added to .dynsym. */
516 struct elf_link_local_dynamic_entry *dynlocal;
518 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
519 objects included in the link. */
520 struct bfd_link_needed_list *runpath;
522 /* Cached first output tls section and size of PT_TLS segment. */
524 bfd_size_type tls_size;
526 /* A linked list of BFD's loaded in the link. */
527 struct elf_link_loaded_list *loaded;
529 /* Short-cuts to get to dynamic linker sections. */
541 /* Look up an entry in an ELF linker hash table. */
543 #define elf_link_hash_lookup(table, string, create, copy, follow) \
544 ((struct elf_link_hash_entry *) \
545 bfd_link_hash_lookup (&(table)->root, (string), (create), \
548 /* Traverse an ELF linker hash table. */
550 #define elf_link_hash_traverse(table, func, info) \
551 (bfd_link_hash_traverse \
553 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
556 /* Get the ELF linker hash table from a link_info structure. */
558 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
560 #define elf_hash_table_id(table) ((table) -> hash_table_id)
562 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
563 #define is_elf_hash_table(htab) \
564 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
566 /* Used by bfd_sym_from_r_symndx to cache a small number of local
568 #define LOCAL_SYM_CACHE_SIZE 32
572 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
573 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
576 /* Constant information held for an ELF backend. */
578 struct elf_size_info {
579 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
580 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
582 /* The size of entries in the .hash section. */
583 unsigned char sizeof_hash_entry;
585 /* The number of internal relocations to allocate per external
587 unsigned char int_rels_per_ext_rel;
588 /* We use some fixed size arrays. This should be large enough to
589 handle all back-ends. */
590 #define MAX_INT_RELS_PER_EXT_REL 3
592 unsigned char arch_size, log_file_align;
593 unsigned char elfclass, ev_current;
594 int (*write_out_phdrs)
595 (bfd *, const Elf_Internal_Phdr *, unsigned int);
597 (*write_shdrs_and_ehdr) (bfd *);
598 bfd_boolean (*checksum_contents)
599 (bfd * , void (*) (const void *, size_t, void *), void *);
601 (bfd *, asection *, void *);
602 bfd_boolean (*swap_symbol_in)
603 (bfd *, const void *, const void *, Elf_Internal_Sym *);
604 void (*swap_symbol_out)
605 (bfd *, const Elf_Internal_Sym *, void *, void *);
606 bfd_boolean (*slurp_reloc_table)
607 (bfd *, asection *, asymbol **, bfd_boolean);
608 long (*slurp_symbol_table)
609 (bfd *, asymbol **, bfd_boolean);
611 (bfd *, const void *, Elf_Internal_Dyn *);
613 (bfd *, const Elf_Internal_Dyn *, void *);
615 /* This function is called to swap in a REL relocation. If an
616 external relocation corresponds to more than one internal
617 relocation, then all relocations are swapped in at once. */
618 void (*swap_reloc_in)
619 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
621 /* This function is called to swap out a REL relocation. */
622 void (*swap_reloc_out)
623 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
625 /* This function is called to swap in a RELA relocation. If an
626 external relocation corresponds to more than one internal
627 relocation, then all relocations are swapped in at once. */
628 void (*swap_reloca_in)
629 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
631 /* This function is called to swap out a RELA relocation. */
632 void (*swap_reloca_out)
633 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
636 #define elf_symbol_from(ABFD,S) \
637 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
638 && (S)->the_bfd->tdata.elf_obj_data != 0) \
639 ? (elf_symbol_type *) (S) \
642 enum elf_reloc_type_class {
644 reloc_class_relative,
649 struct elf_reloc_cookie
651 Elf_Internal_Rela *rels, *rel, *relend;
652 Elf_Internal_Sym *locsyms;
656 struct elf_link_hash_entry **sym_hashes;
658 bfd_boolean bad_symtab;
661 /* The level of IRIX compatibility we're striving for. */
669 /* Mapping of ELF section names and types. */
670 struct bfd_elf_special_section
674 /* 0 means name must match PREFIX exactly.
675 -1 means name must start with PREFIX followed by an arbitrary string.
676 -2 means name must match PREFIX exactly or consist of PREFIX followed
677 by a dot then anything.
678 > 0 means name must start with the first PREFIX_LENGTH chars of
679 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
685 enum action_discarded
691 typedef asection * (*elf_gc_mark_hook_fn)
692 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
693 struct elf_link_hash_entry *, Elf_Internal_Sym *);
695 struct elf_backend_data
697 /* The architecture for this backend. */
698 enum bfd_architecture arch;
700 /* An identifier used to distinguish different target specific
701 extensions to elf_obj_tdata and elf_link_hash_table structures. */
702 enum elf_target_id target_id;
704 /* The ELF machine code (EM_xxxx) for this backend. */
705 int elf_machine_code;
710 /* The maximum page size for this backend. */
713 /* The minimum page size for this backend. An input object will not be
714 considered page aligned unless its sections are correctly aligned for
715 pages at least this large. May be smaller than maxpagesize. */
718 /* The common page size for this backend. */
719 bfd_vma commonpagesize;
721 /* The BFD flags applied to sections created for dynamic linking. */
722 flagword dynamic_sec_flags;
724 /* Architecture-specific data for this backend.
725 This is actually a pointer to some type like struct elf_ARCH_data. */
726 const void *arch_data;
728 /* A function to translate an ELF RELA relocation to a BFD arelent
730 void (*elf_info_to_howto)
731 (bfd *, arelent *, Elf_Internal_Rela *);
733 /* A function to translate an ELF REL relocation to a BFD arelent
735 void (*elf_info_to_howto_rel)
736 (bfd *, arelent *, Elf_Internal_Rela *);
738 /* A function to determine whether a symbol is global when
739 partitioning the symbol table into local and global symbols.
740 This should be NULL for most targets, in which case the correct
741 thing will be done. MIPS ELF, at least on the Irix 5, has
742 special requirements. */
743 bfd_boolean (*elf_backend_sym_is_global)
746 /* The remaining functions are hooks which are called only if they
749 /* A function to permit a backend specific check on whether a
750 particular BFD format is relevant for an object file, and to
751 permit the backend to set any global information it wishes. When
752 this is called elf_elfheader is set, but anything else should be
753 used with caution. If this returns FALSE, the check_format
754 routine will return a bfd_error_wrong_format error. */
755 bfd_boolean (*elf_backend_object_p)
758 /* A function to do additional symbol processing when reading the
759 ELF symbol table. This is where any processor-specific special
760 section indices are handled. */
761 void (*elf_backend_symbol_processing)
764 /* A function to do additional symbol processing after reading the
765 entire ELF symbol table. */
766 bfd_boolean (*elf_backend_symbol_table_processing)
767 (bfd *, elf_symbol_type *, unsigned int);
769 /* A function to set the type of the info field. Processor-specific
770 types should be handled here. */
771 int (*elf_backend_get_symbol_type)
772 (Elf_Internal_Sym *, int);
774 /* A function to return the linker hash table entry of a symbol that
775 might be satisfied by an archive symbol. */
776 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
777 (bfd *, struct bfd_link_info *, const char *);
779 /* Return true if local section symbols should have a non-null st_name.
780 NULL implies false. */
781 bfd_boolean (*elf_backend_name_local_section_symbols)
784 /* A function to do additional processing on the ELF section header
785 just before writing it out. This is used to set the flags and
786 type fields for some sections, or to actually write out data for
788 bfd_boolean (*elf_backend_section_processing)
789 (bfd *, Elf_Internal_Shdr *);
791 /* A function to handle unusual section types when creating BFD
792 sections from ELF sections. */
793 bfd_boolean (*elf_backend_section_from_shdr)
794 (bfd *, Elf_Internal_Shdr *, const char *, int);
796 /* A function to convert machine dependent ELF section header flags to
797 BFD internal section header flags. */
798 bfd_boolean (*elf_backend_section_flags)
799 (flagword *, const Elf_Internal_Shdr *);
801 /* A function that returns a struct containing ELF section flags and
802 type for the given BFD section. */
803 const struct bfd_elf_special_section * (*get_sec_type_attr)
806 /* A function to handle unusual program segment types when creating BFD
807 sections from ELF program segments. */
808 bfd_boolean (*elf_backend_section_from_phdr)
809 (bfd *, Elf_Internal_Phdr *, int, const char *);
811 /* A function to set up the ELF section header for a BFD section in
812 preparation for writing it out. This is where the flags and type
813 fields are set for unusual sections. */
814 bfd_boolean (*elf_backend_fake_sections)
815 (bfd *, Elf_Internal_Shdr *, asection *);
817 /* A function to get the ELF section index for a BFD section. If
818 this returns TRUE, the section was found. If it is a normal ELF
819 section, *RETVAL should be left unchanged. If it is not a normal
820 ELF section *RETVAL should be set to the SHN_xxxx index. */
821 bfd_boolean (*elf_backend_section_from_bfd_section)
822 (bfd *, asection *, int *retval);
824 /* If this field is not NULL, it is called by the add_symbols phase
825 of a link just before adding a symbol to the global linker hash
826 table. It may modify any of the fields as it wishes. If *NAME
827 is set to NULL, the symbol will be skipped rather than being
828 added to the hash table. This function is responsible for
829 handling all processor dependent symbol bindings and section
830 indices, and must set at least *FLAGS and *SEC for each processor
831 dependent case; failure to do so will cause a link error. */
832 bfd_boolean (*elf_add_symbol_hook)
833 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
834 const char **name, flagword *flags, asection **sec, bfd_vma *value);
836 /* If this field is not NULL, it is called by the elf_link_output_sym
837 phase of a link for each symbol which will appear in the object file.
838 On error, this function returns 0. 1 is returned when the symbol
839 should be output, 2 is returned when the symbol should be discarded. */
840 int (*elf_backend_link_output_symbol_hook)
841 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
842 asection *, struct elf_link_hash_entry *);
844 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
845 linker the first time it encounters a dynamic object in the link.
846 This function must create any sections required for dynamic
847 linking. The ABFD argument is a dynamic object. The .interp,
848 .dynamic, .dynsym, .dynstr, and .hash functions have already been
849 created, and this function may modify the section flags if
850 desired. This function will normally create the .got and .plt
851 sections, but different backends have different requirements. */
852 bfd_boolean (*elf_backend_create_dynamic_sections)
853 (bfd *abfd, struct bfd_link_info *info);
855 /* When creating a shared library, determine whether to omit the
856 dynamic symbol for the section. */
857 bfd_boolean (*elf_backend_omit_section_dynsym)
858 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
860 /* Return TRUE if relocations of targets are compatible to the extent
861 that CHECK_RELOCS will properly process them. PR 4424. */
862 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
864 /* The CHECK_RELOCS function is called by the add_symbols phase of
865 the ELF backend linker. It is called once for each section with
866 relocs of an object file, just after the symbols for the object
867 file have been added to the global linker hash table. The
868 function must look through the relocs and do any special handling
869 required. This generally means allocating space in the global
870 offset table, and perhaps allocating space for a reloc. The
871 relocs are always passed as Rela structures; if the section
872 actually uses Rel structures, the r_addend field will always be
874 bfd_boolean (*check_relocs)
875 (bfd *abfd, struct bfd_link_info *info, asection *o,
876 const Elf_Internal_Rela *relocs);
878 /* The CHECK_DIRECTIVES function is called once per input file by
879 the add_symbols phase of the ELF backend linker. The function
880 must inspect the bfd and create any additional symbols according
881 to any custom directives in the bfd. */
882 bfd_boolean (*check_directives)
883 (bfd *abfd, struct bfd_link_info *info);
885 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
886 input file that was not needed by the add_symbols phase of the
887 ELF backend linker. The function must undo any target specific
888 changes in the symbol hash table. */
889 bfd_boolean (*as_needed_cleanup)
890 (bfd *abfd, struct bfd_link_info *info);
892 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
893 linker for every symbol which is defined by a dynamic object and
894 referenced by a regular object. This is called after all the
895 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
896 function has been called. The hash table entry should be
897 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
898 defined in a section from a dynamic object. Dynamic object
899 sections are not included in the final link, and this function is
900 responsible for changing the value to something which the rest of
901 the link can deal with. This will normally involve adding an
902 entry to the .plt or .got or some such section, and setting the
903 symbol to point to that. */
904 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
905 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
907 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
908 after all the linker input files have been seen but before the
909 section sizes have been set. This is called after
910 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
911 bfd_boolean (*elf_backend_always_size_sections)
912 (bfd *output_bfd, struct bfd_link_info *info);
914 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
915 linker after all the linker input files have been seen but before
916 the sections sizes have been set. This is called after
917 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
918 It is only called when linking against a dynamic object. It must
919 set the sizes of the dynamic sections, and may fill in their
920 contents as well. The generic ELF linker can handle the .dynsym,
921 .dynstr and .hash sections. This function must handle the
922 .interp section and any sections created by the
923 CREATE_DYNAMIC_SECTIONS entry point. */
924 bfd_boolean (*elf_backend_size_dynamic_sections)
925 (bfd *output_bfd, struct bfd_link_info *info);
927 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
928 we keep to use as a base for relocs and symbols. */
929 void (*elf_backend_init_index_section)
930 (bfd *output_bfd, struct bfd_link_info *info);
932 /* The RELOCATE_SECTION function is called by the ELF backend linker
933 to handle the relocations for a section.
935 The relocs are always passed as Rela structures; if the section
936 actually uses Rel structures, the r_addend field will always be
939 This function is responsible for adjust the section contents as
940 necessary, and (if using Rela relocs and generating a
941 relocatable output file) adjusting the reloc addend as
944 This function does not have to worry about setting the reloc
945 address or the reloc symbol index.
947 LOCAL_SYMS is a pointer to the swapped in local symbols.
949 LOCAL_SECTIONS is an array giving the section in the input file
950 corresponding to the st_shndx field of each local symbol.
952 The global hash table entry for the global symbols can be found
953 via elf_sym_hashes (input_bfd).
955 When generating relocatable output, this function must handle
956 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
957 going to be the section symbol corresponding to the output
958 section, which means that the addend must be adjusted
961 Returns FALSE on error, TRUE on success, 2 if successful and
962 relocations should be written for this section. */
963 int (*elf_backend_relocate_section)
964 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
965 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
966 Elf_Internal_Sym *local_syms, asection **local_sections);
968 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
969 linker just before it writes a symbol out to the .dynsym section.
970 The processor backend may make any required adjustment to the
971 symbol. It may also take the opportunity to set contents of the
972 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
973 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
974 on those symbols which are defined by a dynamic object. */
975 bfd_boolean (*elf_backend_finish_dynamic_symbol)
976 (bfd *output_bfd, struct bfd_link_info *info,
977 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
979 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
980 linker just before it writes all the dynamic sections out to the
981 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
982 all dynamic symbols. */
983 bfd_boolean (*elf_backend_finish_dynamic_sections)
984 (bfd *output_bfd, struct bfd_link_info *info);
986 /* A function to do any beginning processing needed for the ELF file
987 before building the ELF headers and computing file positions. */
988 void (*elf_backend_begin_write_processing)
989 (bfd *, struct bfd_link_info *);
991 /* A function to do any final processing needed for the ELF file
992 before writing it out. The LINKER argument is TRUE if this BFD
993 was created by the ELF backend linker. */
994 void (*elf_backend_final_write_processing)
995 (bfd *, bfd_boolean linker);
997 /* This function is called by get_program_header_size. It should
998 return the number of additional program segments which this BFD
999 will need. It should return -1 on error. */
1000 int (*elf_backend_additional_program_headers)
1001 (bfd *, struct bfd_link_info *);
1003 /* This function is called to modify an existing segment map in a
1004 backend specific fashion. */
1005 bfd_boolean (*elf_backend_modify_segment_map)
1006 (bfd *, struct bfd_link_info *);
1008 /* This function is called to modify program headers just before
1009 they are written. */
1010 bfd_boolean (*elf_backend_modify_program_headers)
1011 (bfd *, struct bfd_link_info *);
1013 /* This function is called before section garbage collection to
1014 mark entry symbol sections. */
1016 (struct bfd_link_info *);
1018 /* This function is called during section garbage collection to
1019 mark sections that define global symbols. */
1020 bfd_boolean (*gc_mark_dynamic_ref)
1021 (struct elf_link_hash_entry *, void *);
1023 /* This function is called during section gc to discover the section a
1024 particular relocation refers to. */
1025 elf_gc_mark_hook_fn gc_mark_hook;
1027 /* This function, if defined, is called after the first gc marking pass
1028 to allow the backend to mark additional sections. */
1029 bfd_boolean (*gc_mark_extra_sections)
1030 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1032 /* This function, if defined, is called during the sweep phase of gc
1033 in order that a backend might update any data structures it might
1035 bfd_boolean (*gc_sweep_hook)
1036 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1038 /* This function, if defined, is called after the ELF headers have
1039 been created. This allows for things like the OS and ABI versions
1041 void (*elf_backend_post_process_headers)
1042 (bfd *, struct bfd_link_info *);
1044 /* This function, if defined, prints a symbol to file and returns the
1045 name of the symbol to be printed. It should return NULL to fall
1046 back to default symbol printing. */
1047 const char *(*elf_backend_print_symbol_all)
1048 (bfd *, void *, asymbol *);
1050 /* This function, if defined, is called after all local symbols and
1051 global symbols converted to locals are emitted into the symtab
1052 section. It allows the backend to emit special local symbols
1053 not handled in the hash table. */
1054 bfd_boolean (*elf_backend_output_arch_local_syms)
1055 (bfd *, struct bfd_link_info *, void *,
1056 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1057 struct elf_link_hash_entry *));
1059 /* This function, if defined, is called after all symbols are emitted
1060 into the symtab section. It allows the backend to emit special
1061 global symbols not handled in the hash table. */
1062 bfd_boolean (*elf_backend_output_arch_syms)
1063 (bfd *, struct bfd_link_info *, void *,
1064 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1065 struct elf_link_hash_entry *));
1067 /* Copy any information related to dynamic linking from a pre-existing
1068 symbol to a newly created symbol. Also called to copy flags and
1069 other back-end info to a weakdef, in which case the symbol is not
1070 newly created and plt/got refcounts and dynamic indices should not
1072 void (*elf_backend_copy_indirect_symbol)
1073 (struct bfd_link_info *, struct elf_link_hash_entry *,
1074 struct elf_link_hash_entry *);
1076 /* Modify any information related to dynamic linking such that the
1077 symbol is not exported. */
1078 void (*elf_backend_hide_symbol)
1079 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1081 /* A function to do additional symbol fixup, called by
1082 _bfd_elf_fix_symbol_flags. */
1083 bfd_boolean (*elf_backend_fixup_symbol)
1084 (struct bfd_link_info *, struct elf_link_hash_entry *);
1086 /* Merge the backend specific symbol attribute. */
1087 void (*elf_backend_merge_symbol_attribute)
1088 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1091 /* This function, if defined, will return a string containing the
1092 name of a target-specific dynamic tag. */
1093 char *(*elf_backend_get_target_dtag)
1096 /* Decide whether an undefined symbol is special and can be ignored.
1097 This is the case for OPTIONAL symbols on IRIX. */
1098 bfd_boolean (*elf_backend_ignore_undef_symbol)
1099 (struct elf_link_hash_entry *);
1101 /* Emit relocations. Overrides default routine for emitting relocs,
1102 except during a relocatable link, or if all relocs are being emitted. */
1103 bfd_boolean (*elf_backend_emit_relocs)
1104 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1105 struct elf_link_hash_entry **);
1107 /* Count relocations. Not called for relocatable links
1108 or if all relocs are being preserved in the output. */
1109 unsigned int (*elf_backend_count_relocs)
1110 (struct bfd_link_info *, asection *);
1112 /* This function, if defined, is called when an NT_PRSTATUS note is found
1114 bfd_boolean (*elf_backend_grok_prstatus)
1115 (bfd *, Elf_Internal_Note *);
1117 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1118 note is found in a core file. */
1119 bfd_boolean (*elf_backend_grok_psinfo)
1120 (bfd *, Elf_Internal_Note *);
1122 /* This function, if defined, is called to write a note to a corefile. */
1123 char *(*elf_backend_write_core_note)
1124 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1126 /* This function, if defined, is called to convert target-specific
1127 section flag names into hex values. */
1128 flagword (*elf_backend_lookup_section_flags_hook)
1131 /* This function returns class of a reloc type. */
1132 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1133 (const Elf_Internal_Rela *);
1135 /* This function, if defined, removes information about discarded functions
1136 from other sections which mention them. */
1137 bfd_boolean (*elf_backend_discard_info)
1138 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1140 /* This function, if defined, signals that the function above has removed
1141 the discarded relocations for this section. */
1142 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1145 /* What to do when ld finds relocations against symbols defined in
1146 discarded sections. */
1147 unsigned int (*action_discarded)
1150 /* This function returns the width of FDE pointers in bytes, or 0 if
1151 that can't be determined for some reason. The default definition
1152 goes by the bfd's EI_CLASS. */
1153 unsigned int (*elf_backend_eh_frame_address_size)
1154 (bfd *, asection *);
1156 /* These functions tell elf-eh-frame whether to attempt to turn
1157 absolute or lsda encodings into pc-relative ones. The default
1158 definition enables these transformations. */
1159 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1160 (bfd *, struct bfd_link_info *, asection *);
1161 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1162 (bfd *, struct bfd_link_info *, asection *);
1164 /* This function returns an encoding after computing the encoded
1165 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1166 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1167 The default definition chooses a 32-bit PC-relative encoding. */
1168 bfd_byte (*elf_backend_encode_eh_address)
1169 (bfd *abfd, struct bfd_link_info *info,
1170 asection *osec, bfd_vma offset,
1171 asection *loc_sec, bfd_vma loc_offset,
1174 /* This function, if defined, may write out the given section.
1175 Returns TRUE if it did so and FALSE if the caller should. */
1176 bfd_boolean (*elf_backend_write_section)
1177 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1179 /* The level of IRIX compatibility we're striving for.
1180 MIPS ELF specific function. */
1181 irix_compat_t (*elf_backend_mips_irix_compat)
1184 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1185 (unsigned int, bfd_boolean);
1187 /* The swapping table to use when dealing with ECOFF information.
1188 Used for the MIPS ELF .mdebug section. */
1189 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1191 /* This function implements `bfd_elf_bfd_from_remote_memory';
1192 see elf.c, elfcode.h. */
1193 bfd *(*elf_backend_bfd_from_remote_memory)
1194 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1195 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1196 bfd_size_type len));
1198 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1200 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1202 /* Is symbol defined in common section? */
1203 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1205 /* Return a common section index for section. */
1206 unsigned int (*common_section_index) (asection *);
1208 /* Return a common section for section. */
1209 asection *(*common_section) (asection *);
1211 /* Return TRUE if we can merge 2 definitions. */
1212 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1213 struct elf_link_hash_entry **,
1214 struct elf_link_hash_entry *,
1215 Elf_Internal_Sym *, asection **,
1216 bfd_vma *, unsigned int *,
1217 bfd_boolean *, bfd_boolean *,
1218 bfd_boolean *, bfd_boolean *,
1219 bfd_boolean *, bfd_boolean *,
1220 bfd_boolean *, bfd_boolean *,
1222 bfd_boolean *, bfd_boolean *,
1223 bfd_boolean *, bfd_boolean *,
1224 bfd *, asection **);
1226 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1227 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1229 /* Return TRUE if type is a function symbol type. */
1230 bfd_boolean (*is_function_type) (unsigned int type);
1232 /* If the ELF symbol SYM might be a function in SEC, return the
1233 function size and set *CODE_OFF to the function's entry point,
1234 otherwise return zero. */
1235 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1238 /* Used to handle bad SHF_LINK_ORDER input. */
1239 bfd_error_handler_type link_order_error_handler;
1241 /* Name of the PLT relocation section. */
1242 const char *relplt_name;
1244 /* Alternate EM_xxxx machine codes for this backend. */
1245 int elf_machine_alt1;
1246 int elf_machine_alt2;
1248 const struct elf_size_info *s;
1250 /* An array of target specific special sections. */
1251 const struct bfd_elf_special_section *special_sections;
1253 /* The size in bytes of the header for the GOT. This includes the
1254 so-called reserved entries on some systems. */
1255 bfd_vma got_header_size;
1257 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1258 otherwise by the local symbol with index SYMNDX in IBFD. */
1259 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1260 struct elf_link_hash_entry *h,
1261 bfd *ibfd, unsigned long symndx);
1263 /* The vendor name to use for a processor-standard attributes section. */
1264 const char *obj_attrs_vendor;
1266 /* The section name to use for a processor-standard attributes section. */
1267 const char *obj_attrs_section;
1269 /* Return 1, 2 or 3 to indicate what type of arguments a
1270 processor-specific tag takes. */
1271 int (*obj_attrs_arg_type) (int);
1273 /* The section type to use for an attributes section. */
1274 unsigned int obj_attrs_section_type;
1276 /* This function determines the order in which any attributes are
1277 written. It must be defined for input in the range
1278 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1279 is used in order to make unity easy). The returned value is the
1280 actual tag number to place in the input position. */
1281 int (*obj_attrs_order) (int);
1283 /* Handle merging unknown attributes; either warn and return TRUE,
1284 or give an error and return FALSE. */
1285 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1287 /* This is non-zero if static TLS segments require a special alignment. */
1288 unsigned static_tls_alignment;
1290 /* Alignment for the PT_GNU_STACK segment. */
1291 unsigned stack_align;
1293 /* This is TRUE if the linker should act like collect and gather
1294 global constructors and destructors by name. This is TRUE for
1295 MIPS ELF because the Irix 5 tools can not handle the .init
1297 unsigned collect : 1;
1299 /* This is TRUE if the linker should ignore changes to the type of a
1300 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1301 record undefined functions as STT_OBJECT although the definitions
1303 unsigned type_change_ok : 1;
1305 /* Whether the backend may use REL relocations. (Some backends use
1306 both REL and RELA relocations, and this flag is set for those
1308 unsigned may_use_rel_p : 1;
1310 /* Whether the backend may use RELA relocations. (Some backends use
1311 both REL and RELA relocations, and this flag is set for those
1313 unsigned may_use_rela_p : 1;
1315 /* Whether the default relocation type is RELA. If a backend with
1316 this flag set wants REL relocations for a particular section,
1317 it must note that explicitly. Similarly, if this flag is clear,
1318 and the backend wants RELA relocations for a particular
1320 unsigned default_use_rela_p : 1;
1322 /* True if PLT and copy relocations should be RELA by default. */
1323 unsigned rela_plts_and_copies_p : 1;
1325 /* Set if RELA relocations for a relocatable link can be handled by
1326 generic code. Backends that set this flag need do nothing in the
1327 backend relocate_section routine for relocatable linking. */
1328 unsigned rela_normal : 1;
1330 /* TRUE if addresses "naturally" sign extend. This is used when
1331 swapping in from Elf32 when BFD64. */
1332 unsigned sign_extend_vma : 1;
1334 unsigned want_got_plt : 1;
1335 unsigned plt_readonly : 1;
1336 unsigned want_plt_sym : 1;
1337 unsigned plt_not_loaded : 1;
1338 unsigned plt_alignment : 4;
1339 unsigned can_gc_sections : 1;
1340 unsigned can_refcount : 1;
1341 unsigned want_got_sym : 1;
1342 unsigned want_dynbss : 1;
1344 /* Targets which do not support physical addressing often require
1345 that the p_paddr field in the section header to be set to zero.
1346 This field indicates whether this behavior is required. */
1347 unsigned want_p_paddr_set_to_zero : 1;
1349 /* True if an object file lacking a .note.GNU-stack section
1350 should be assumed to be requesting exec stack. At least one
1351 other file in the link needs to have a .note.GNU-stack section
1352 for a PT_GNU_STACK segment to be created. */
1353 unsigned default_execstack : 1;
1356 /* Information about reloc sections associated with a bfd_elf_section_data
1358 struct bfd_elf_section_reloc_data
1360 /* The ELF header for the reloc section associated with this
1362 Elf_Internal_Shdr *hdr;
1363 /* The number of relocations currently assigned to HDR. */
1365 /* The ELF section number of the reloc section. Only used for an
1368 /* Used by the backend linker to store the symbol hash table entries
1369 associated with relocs against global symbols. */
1370 struct elf_link_hash_entry **hashes;
1373 /* Information stored for each BFD section in an ELF file. This
1374 structure is allocated by elf_new_section_hook. */
1376 struct bfd_elf_section_data
1378 /* The ELF header for this section. */
1379 Elf_Internal_Shdr this_hdr;
1381 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1382 struct flag_info *section_flag_info;
1384 /* Information about the REL and RELA reloc sections associated
1385 with this section, if any. */
1386 struct bfd_elf_section_reloc_data rel, rela;
1388 /* The ELF section number of this section. */
1391 /* Used by the backend linker when generating a shared library to
1392 record the dynamic symbol index for a section symbol
1393 corresponding to this section. A value of 0 means that there is
1394 no dynamic symbol for this section. */
1397 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1398 asection *linked_to;
1400 /* A pointer to the swapped relocs. If the section uses REL relocs,
1401 rather than RELA, all the r_addend fields will be zero. This
1402 pointer may be NULL. It is used by the backend linker. */
1403 Elf_Internal_Rela *relocs;
1405 /* A pointer to a linked list tracking dynamic relocs copied for
1409 /* A pointer to the bfd section used for dynamic relocs. */
1413 /* Group name, if this section is a member of a group. */
1416 /* Group signature sym, if this is the SHT_GROUP section. */
1417 struct bfd_symbol *id;
1420 /* For a member of a group, points to the SHT_GROUP section.
1421 NULL for the SHT_GROUP section itself and non-group sections. */
1422 asection *sec_group;
1424 /* A linked list of member sections in the group. Circular when used by
1425 the linker. For the SHT_GROUP section, points at first member. */
1426 asection *next_in_group;
1428 /* The FDEs associated with this section. The u.fde.next_in_section
1429 field acts as a chain pointer. */
1430 struct eh_cie_fde *fde_list;
1432 /* A pointer used for various section optimizations. */
1436 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1437 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1438 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1439 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1440 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1441 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1442 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1443 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1444 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1446 #define xvec_get_elf_backend_data(xvec) \
1447 ((const struct elf_backend_data *) (xvec)->backend_data)
1449 #define get_elf_backend_data(abfd) \
1450 xvec_get_elf_backend_data ((abfd)->xvec)
1452 /* The least object attributes (within an attributes subsection) known
1453 for any target. Some code assumes that the value 0 is not used and
1454 the field for that attribute can instead be used as a marker to
1455 indicate that attributes have been initialized. */
1456 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1458 /* The maximum number of known object attributes for any target. */
1459 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1461 /* The value of an object attribute. The type indicates whether the attribute
1462 holds and integer, a string, or both. It can also indicate that there can
1463 be no default (i.e. all values must be written to file, even zero). */
1465 typedef struct obj_attribute
1467 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1468 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1469 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1471 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1472 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1473 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1480 typedef struct obj_attribute_list
1482 struct obj_attribute_list *next;
1485 } obj_attribute_list;
1487 /* Object attributes may either be defined by the processor ABI, index
1488 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1489 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1490 #define OBJ_ATTR_PROC 0
1491 #define OBJ_ATTR_GNU 1
1492 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1493 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1495 /* The following object attribute tags are taken as generic, for all
1496 targets and for "gnu" where there is no target standard. */
1503 Tag_compatibility = 32
1506 /* The following struct stores information about every SystemTap section
1507 found in the object file. */
1510 struct sdt_note *next;
1515 /* Some private data is stashed away for future use using the tdata pointer
1516 in the bfd structure. */
1518 struct elf_obj_tdata
1520 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1521 Elf_Internal_Shdr **elf_sect_ptr;
1522 Elf_Internal_Phdr *phdr;
1523 struct elf_segment_map *segment_map;
1524 struct elf_strtab_hash *strtab_ptr;
1527 unsigned int num_elf_sections; /* elf_sect_ptr size */
1528 int num_section_syms;
1529 asymbol **section_syms; /* STT_SECTION symbols for each section */
1530 Elf_Internal_Shdr symtab_hdr;
1531 Elf_Internal_Shdr shstrtab_hdr;
1532 Elf_Internal_Shdr strtab_hdr;
1533 Elf_Internal_Shdr dynsymtab_hdr;
1534 Elf_Internal_Shdr dynstrtab_hdr;
1535 Elf_Internal_Shdr dynversym_hdr;
1536 Elf_Internal_Shdr dynverref_hdr;
1537 Elf_Internal_Shdr dynverdef_hdr;
1538 Elf_Internal_Shdr symtab_shndx_hdr;
1539 unsigned int symtab_section, shstrtab_section;
1540 unsigned int strtab_section, dynsymtab_section;
1541 unsigned int symtab_shndx_section;
1542 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1543 file_ptr next_file_pos;
1544 bfd_vma gp; /* The gp value */
1545 unsigned int gp_size; /* The gp size */
1547 /* Information grabbed from an elf core file. */
1554 /* A mapping from external symbols to entries in the linker hash
1555 table, used when linking. This is indexed by the symbol index
1556 minus the sh_info field of the symbol table header. */
1557 struct elf_link_hash_entry **sym_hashes;
1559 /* Track usage and final offsets of GOT entries for local symbols.
1560 This array is indexed by symbol index. Elements are used
1561 identically to "got" in struct elf_link_hash_entry. */
1564 bfd_signed_vma *refcounts;
1566 struct got_entry **ents;
1569 /* The linker ELF emulation code needs to let the backend ELF linker
1570 know what filename should be used for a dynamic object if the
1571 dynamic object is found using a search. The emulation code then
1572 sometimes needs to know what name was actually used. Until the
1573 file has been added to the linker symbol table, this field holds
1574 the name the linker wants. After it has been added, it holds the
1575 name actually used, which will be the DT_SONAME entry if there is
1577 const char *dt_name;
1579 /* The linker emulation needs to know what audit libs
1580 are used by a dynamic object. */
1581 const char *dt_audit;
1583 /* Records the result of `get_program_header_size'. */
1584 bfd_size_type program_header_size;
1586 /* Used by find_nearest_line entry point. */
1589 /* Used by MIPS ELF find_nearest_line entry point. The structure
1590 could be included directly in this one, but there's no point to
1591 wasting the memory just for the infrequently called
1592 find_nearest_line. */
1593 struct mips_elf_find_line *find_line_info;
1595 /* A place to stash dwarf1 info for this bfd. */
1596 struct dwarf1_debug *dwarf1_find_line_info;
1598 /* A place to stash dwarf2 info for this bfd. */
1599 void *dwarf2_find_line_info;
1601 /* Stash away info for yet another find line/function variant. */
1602 void *elf_find_function_cache;
1604 /* An array of stub sections indexed by symbol number, used by the
1605 MIPS ELF linker. FIXME: We should figure out some way to only
1606 include this field for a MIPS ELF target. */
1607 asection **local_stubs;
1608 asection **local_call_stubs;
1610 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1612 asection *eh_frame_hdr;
1614 Elf_Internal_Shdr **group_sect_ptr;
1617 /* Number of symbol version definitions we are about to emit. */
1618 unsigned int cverdefs;
1620 /* Number of symbol version references we are about to emit. */
1621 unsigned int cverrefs;
1623 /* Segment flags for the PT_GNU_STACK segment. */
1624 unsigned int stack_flags;
1626 /* Symbol version definitions in external objects. */
1627 Elf_Internal_Verdef *verdef;
1629 /* Symbol version references to external objects. */
1630 Elf_Internal_Verneed *verref;
1632 /* The Irix 5 support uses two virtual sections, which represent
1633 text/data symbols defined in dynamic objects. */
1634 asymbol *elf_data_symbol;
1635 asymbol *elf_text_symbol;
1636 asection *elf_data_section;
1637 asection *elf_text_section;
1639 /* A pointer to the .eh_frame section. */
1640 asection *eh_frame_section;
1642 /* Whether a dyanmic object was specified normally on the linker
1643 command line, or was specified when --as-needed was in effect,
1644 or was found via a DT_NEEDED entry. */
1645 enum dynamic_lib_link_class dyn_lib_class;
1647 /* This is set to TRUE if the object was created by the backend
1651 /* Irix 5 often screws up the symbol table, sorting local symbols
1652 after global symbols. This flag is set if the symbol table in
1653 this BFD appears to be screwed up. If it is, we ignore the
1654 sh_info field in the symbol table header, and always read all the
1656 bfd_boolean bad_symtab;
1658 /* Used to determine if the e_flags field has been initialized */
1659 bfd_boolean flags_init;
1661 /* Symbol buffer. */
1664 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1665 obj_attribute_list *other_obj_attributes[2];
1667 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1668 bfd_boolean (*after_write_object_contents) (bfd *);
1669 void *after_write_object_contents_info;
1671 /* NT_GNU_BUILD_ID note type. */
1672 bfd_size_type build_id_size;
1675 /* Linked-list containing information about every Systemtap section
1676 found in the object file. Each section corresponds to one entry
1678 struct sdt_note *sdt_note_head;
1680 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1681 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1682 field in the ELF header structure. */
1683 bfd_boolean has_gnu_symbols;
1685 /* An identifier used to distinguish different target
1686 specific extensions to this structure. */
1687 enum elf_target_id object_id;
1690 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1692 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1693 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> program_header_size)
1694 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1695 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1696 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1697 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1698 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1699 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1700 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1701 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1702 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1703 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1704 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1705 #define elf_eh_frame_section(bfd) \
1706 (elf_tdata(bfd) -> eh_frame_section)
1707 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1708 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1709 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1710 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1711 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1712 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1713 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1714 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1715 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1716 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1717 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1718 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1719 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1720 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1721 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1722 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1723 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1724 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1725 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1726 #define elf_known_obj_attributes_proc(bfd) \
1727 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1728 #define elf_other_obj_attributes_proc(bfd) \
1729 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1731 extern void _bfd_elf_swap_verdef_in
1732 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1733 extern void _bfd_elf_swap_verdef_out
1734 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1735 extern void _bfd_elf_swap_verdaux_in
1736 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1737 extern void _bfd_elf_swap_verdaux_out
1738 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1739 extern void _bfd_elf_swap_verneed_in
1740 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1741 extern void _bfd_elf_swap_verneed_out
1742 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1743 extern void _bfd_elf_swap_vernaux_in
1744 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1745 extern void _bfd_elf_swap_vernaux_out
1746 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1747 extern void _bfd_elf_swap_versym_in
1748 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1749 extern void _bfd_elf_swap_versym_out
1750 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1752 extern unsigned int _bfd_elf_section_from_bfd_section
1753 (bfd *, asection *);
1754 extern char *bfd_elf_string_from_elf_section
1755 (bfd *, unsigned, unsigned);
1756 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1757 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1758 Elf_External_Sym_Shndx *);
1759 extern const char *bfd_elf_sym_name
1760 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1762 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1764 extern bfd_boolean _bfd_elf_print_private_bfd_data
1766 extern void bfd_elf_print_symbol
1767 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1769 extern unsigned int _bfd_elf_eh_frame_address_size
1770 (bfd *, asection *);
1771 extern bfd_byte _bfd_elf_encode_eh_address
1772 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1773 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1774 extern bfd_boolean _bfd_elf_can_make_relative
1775 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1777 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1778 (const Elf_Internal_Rela *);
1779 extern bfd_vma _bfd_elf_rela_local_sym
1780 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1781 extern bfd_vma _bfd_elf_rel_local_sym
1782 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1783 extern bfd_vma _bfd_elf_section_offset
1784 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1786 extern unsigned long bfd_elf_hash
1788 extern unsigned long bfd_elf_gnu_hash
1791 extern bfd_reloc_status_type bfd_elf_generic_reloc
1792 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1793 extern bfd_boolean bfd_elf_allocate_object
1794 (bfd *, size_t, enum elf_target_id);
1795 extern bfd_boolean bfd_elf_make_object
1797 extern bfd_boolean bfd_elf_mkcorefile
1799 extern bfd_boolean _bfd_elf_make_section_from_shdr
1800 (bfd *, Elf_Internal_Shdr *, const char *, int);
1801 extern bfd_boolean _bfd_elf_make_section_from_phdr
1802 (bfd *, Elf_Internal_Phdr *, int, const char *);
1803 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1804 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1805 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1807 extern void _bfd_elf_link_hash_copy_indirect
1808 (struct bfd_link_info *, struct elf_link_hash_entry *,
1809 struct elf_link_hash_entry *);
1810 extern void _bfd_elf_link_hash_hide_symbol
1811 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1812 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1813 (struct bfd_link_info *, struct elf_link_hash_entry *);
1814 extern bfd_boolean _bfd_elf_link_hash_table_init
1815 (struct elf_link_hash_table *, bfd *,
1816 struct bfd_hash_entry *(*)
1817 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1818 unsigned int, enum elf_target_id);
1819 extern bfd_boolean _bfd_elf_slurp_version_tables
1820 (bfd *, bfd_boolean);
1821 extern bfd_boolean _bfd_elf_merge_sections
1822 (bfd *, struct bfd_link_info *);
1823 extern bfd_boolean _bfd_elf_match_sections_by_type
1824 (bfd *, const asection *, bfd *, const asection *);
1825 extern bfd_boolean bfd_elf_is_group_section
1826 (bfd *, const struct bfd_section *);
1827 extern bfd_boolean _bfd_elf_section_already_linked
1828 (bfd *, asection *, struct bfd_link_info *);
1829 extern void bfd_elf_set_group_contents
1830 (bfd *, asection *, void *);
1831 extern asection *_bfd_elf_check_kept_section
1832 (asection *, struct bfd_link_info *);
1833 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
1834 extern void _bfd_elf_copy_link_hash_symbol_type
1835 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1836 extern bfd_boolean _bfd_elf_size_group_sections
1837 (struct bfd_link_info *);
1838 extern bfd_boolean _bfd_elf_fixup_group_sections
1839 (bfd *, asection *);
1840 extern bfd_boolean _bfd_elf_copy_private_header_data
1842 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1843 (bfd *, asymbol *, bfd *, asymbol *);
1844 #define _bfd_generic_init_private_section_data \
1845 _bfd_elf_init_private_section_data
1846 extern bfd_boolean _bfd_elf_init_private_section_data
1847 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1848 extern bfd_boolean _bfd_elf_copy_private_section_data
1849 (bfd *, asection *, bfd *, asection *);
1850 extern bfd_boolean _bfd_elf_write_object_contents
1852 extern bfd_boolean _bfd_elf_write_corefile_contents
1854 extern bfd_boolean _bfd_elf_set_section_contents
1855 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1856 extern long _bfd_elf_get_symtab_upper_bound
1858 extern long _bfd_elf_canonicalize_symtab
1859 (bfd *, asymbol **);
1860 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1862 extern long _bfd_elf_canonicalize_dynamic_symtab
1863 (bfd *, asymbol **);
1864 extern long _bfd_elf_get_synthetic_symtab
1865 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1866 extern long _bfd_elf_get_reloc_upper_bound
1868 extern long _bfd_elf_canonicalize_reloc
1869 (bfd *, sec_ptr, arelent **, asymbol **);
1870 extern asection * _bfd_elf_get_dynamic_reloc_section
1871 (bfd *, asection *, bfd_boolean);
1872 extern asection * _bfd_elf_make_dynamic_reloc_section
1873 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1874 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1876 extern long _bfd_elf_canonicalize_dynamic_reloc
1877 (bfd *, arelent **, asymbol **);
1878 extern asymbol *_bfd_elf_make_empty_symbol
1880 extern void _bfd_elf_get_symbol_info
1881 (bfd *, asymbol *, symbol_info *);
1882 extern bfd_boolean _bfd_elf_is_local_label_name
1883 (bfd *, const char *);
1884 extern alent *_bfd_elf_get_lineno
1886 extern bfd_boolean _bfd_elf_set_arch_mach
1887 (bfd *, enum bfd_architecture, unsigned long);
1888 extern bfd_boolean _bfd_elf_find_nearest_line
1889 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1891 extern bfd_boolean _bfd_elf_find_nearest_line_discriminator
1892 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1893 unsigned int *, unsigned int *);
1894 extern bfd_boolean _bfd_elf_find_line
1895 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1896 extern bfd_boolean _bfd_elf_find_line_discriminator
1897 (bfd *, asymbol **, asymbol *, const char **, unsigned int *, unsigned int *);
1898 #define _bfd_generic_find_line _bfd_elf_find_line
1899 #define _bfd_generic_find_nearest_line_discriminator \
1900 _bfd_elf_find_nearest_line_discriminator
1901 extern bfd_boolean _bfd_elf_find_inliner_info
1902 (bfd *, const char **, const char **, unsigned int *);
1903 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1904 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1905 extern int _bfd_elf_sizeof_headers
1906 (bfd *, struct bfd_link_info *);
1907 extern bfd_boolean _bfd_elf_new_section_hook
1908 (bfd *, asection *);
1909 extern bfd_boolean _bfd_elf_init_reloc_shdr
1910 (bfd *, struct bfd_elf_section_reloc_data *, asection *, bfd_boolean);
1911 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1912 (const char *, const struct bfd_elf_special_section *, unsigned int);
1913 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1914 (bfd *, asection *);
1916 /* If the target doesn't have reloc handling written yet: */
1917 extern void _bfd_elf_no_info_to_howto
1918 (bfd *, arelent *, Elf_Internal_Rela *);
1920 extern bfd_boolean bfd_section_from_shdr
1921 (bfd *, unsigned int shindex);
1922 extern bfd_boolean bfd_section_from_phdr
1923 (bfd *, Elf_Internal_Phdr *, int);
1925 extern int _bfd_elf_symbol_from_bfd_symbol
1926 (bfd *, asymbol **);
1928 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
1929 (struct sym_cache *, bfd *, unsigned long);
1930 extern asection *bfd_section_from_elf_index
1931 (bfd *, unsigned int);
1932 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1935 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1937 extern void _bfd_elf_strtab_free
1938 (struct elf_strtab_hash *);
1939 extern bfd_size_type _bfd_elf_strtab_add
1940 (struct elf_strtab_hash *, const char *, bfd_boolean);
1941 extern void _bfd_elf_strtab_addref
1942 (struct elf_strtab_hash *, bfd_size_type);
1943 extern void _bfd_elf_strtab_delref
1944 (struct elf_strtab_hash *, bfd_size_type);
1945 extern unsigned int _bfd_elf_strtab_refcount
1946 (struct elf_strtab_hash *, bfd_size_type);
1947 extern void _bfd_elf_strtab_clear_refs
1948 (struct elf_strtab_hash *, bfd_size_type);
1949 #define _bfd_elf_strtab_clear_all_refs(tab) \
1950 do { _bfd_elf_strtab_clear_refs (tab, 1); } while (0)
1951 extern bfd_size_type _bfd_elf_strtab_size
1952 (struct elf_strtab_hash *);
1953 extern bfd_size_type _bfd_elf_strtab_offset
1954 (struct elf_strtab_hash *, bfd_size_type);
1955 extern bfd_boolean _bfd_elf_strtab_emit
1956 (bfd *, struct elf_strtab_hash *);
1957 extern void _bfd_elf_strtab_finalize
1958 (struct elf_strtab_hash *);
1960 extern void _bfd_elf_begin_eh_frame_parsing
1961 (struct bfd_link_info *info);
1962 extern void _bfd_elf_parse_eh_frame
1963 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1964 extern void _bfd_elf_end_eh_frame_parsing
1965 (struct bfd_link_info *info);
1967 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1968 (bfd *, struct bfd_link_info *, asection *,
1969 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1970 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1971 (bfd *, struct bfd_link_info *);
1972 extern bfd_vma _bfd_elf_eh_frame_section_offset
1973 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1974 extern bfd_boolean _bfd_elf_write_section_eh_frame
1975 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1976 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1977 (bfd *, struct bfd_link_info *);
1978 extern bfd_boolean _bfd_elf_eh_frame_present
1979 (struct bfd_link_info *);
1980 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1981 (struct bfd_link_info *);
1983 extern bfd_boolean _bfd_elf_merge_symbol
1984 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1985 asection **, bfd_vma *, bfd_boolean *, unsigned int *,
1986 struct elf_link_hash_entry **, bfd_boolean *,
1987 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1989 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1991 extern long _bfd_elf_link_lookup_local_dynindx
1992 (struct bfd_link_info *, bfd *, long);
1993 extern bfd_boolean _bfd_elf_compute_section_file_positions
1994 (bfd *, struct bfd_link_info *);
1995 extern void _bfd_elf_assign_file_positions_for_relocs
1997 extern file_ptr _bfd_elf_assign_file_position_for_section
1998 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
2000 extern bfd_boolean _bfd_elf_validate_reloc
2003 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
2004 (bfd *, struct bfd_link_info *);
2005 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
2006 (bfd *, struct bfd_link_info *, asection *);
2007 extern bfd_boolean _bfd_elf_create_dynamic_sections
2008 (bfd *, struct bfd_link_info *);
2009 extern bfd_boolean _bfd_elf_create_got_section
2010 (bfd *, struct bfd_link_info *);
2011 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2012 (bfd *, struct bfd_link_info *, asection *, const char *);
2013 extern void _bfd_elf_init_1_index_section
2014 (bfd *, struct bfd_link_info *);
2015 extern void _bfd_elf_init_2_index_sections
2016 (bfd *, struct bfd_link_info *);
2018 extern bfd_boolean _bfd_elfcore_make_pseudosection
2019 (bfd *, char *, size_t, ufile_ptr);
2020 extern char *_bfd_elfcore_strndup
2021 (bfd *, char *, size_t);
2023 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2024 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2026 extern bfd_boolean _bfd_elf_link_output_relocs
2027 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2028 struct elf_link_hash_entry **);
2030 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2031 (struct elf_link_hash_entry *, asection *);
2033 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2034 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2036 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2037 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2039 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2040 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2042 extern bfd_boolean _bfd_elf_setup_sections
2045 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
2047 extern const bfd_target *bfd_elf32_object_p
2049 extern const bfd_target *bfd_elf32_core_file_p
2051 extern char *bfd_elf32_core_file_failing_command
2053 extern int bfd_elf32_core_file_failing_signal
2055 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2057 extern int bfd_elf32_core_file_pid
2060 extern bfd_boolean bfd_elf32_swap_symbol_in
2061 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2062 extern void bfd_elf32_swap_symbol_out
2063 (bfd *, const Elf_Internal_Sym *, void *, void *);
2064 extern void bfd_elf32_swap_reloc_in
2065 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2066 extern void bfd_elf32_swap_reloc_out
2067 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2068 extern void bfd_elf32_swap_reloca_in
2069 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2070 extern void bfd_elf32_swap_reloca_out
2071 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2072 extern void bfd_elf32_swap_phdr_in
2073 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2074 extern void bfd_elf32_swap_phdr_out
2075 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2076 extern void bfd_elf32_swap_dyn_in
2077 (bfd *, const void *, Elf_Internal_Dyn *);
2078 extern void bfd_elf32_swap_dyn_out
2079 (bfd *, const Elf_Internal_Dyn *, void *);
2080 extern long bfd_elf32_slurp_symbol_table
2081 (bfd *, asymbol **, bfd_boolean);
2082 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2084 extern int bfd_elf32_write_out_phdrs
2085 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2086 extern bfd_boolean bfd_elf32_checksum_contents
2087 (bfd * , void (*) (const void *, size_t, void *), void *);
2088 extern void bfd_elf32_write_relocs
2089 (bfd *, asection *, void *);
2090 extern bfd_boolean bfd_elf32_slurp_reloc_table
2091 (bfd *, asection *, asymbol **, bfd_boolean);
2093 extern const bfd_target *bfd_elf64_object_p
2095 extern const bfd_target *bfd_elf64_core_file_p
2097 extern char *bfd_elf64_core_file_failing_command
2099 extern int bfd_elf64_core_file_failing_signal
2101 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2103 extern int bfd_elf64_core_file_pid
2106 extern bfd_boolean bfd_elf64_swap_symbol_in
2107 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2108 extern void bfd_elf64_swap_symbol_out
2109 (bfd *, const Elf_Internal_Sym *, void *, void *);
2110 extern void bfd_elf64_swap_reloc_in
2111 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2112 extern void bfd_elf64_swap_reloc_out
2113 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2114 extern void bfd_elf64_swap_reloca_in
2115 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2116 extern void bfd_elf64_swap_reloca_out
2117 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2118 extern void bfd_elf64_swap_phdr_in
2119 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2120 extern void bfd_elf64_swap_phdr_out
2121 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2122 extern void bfd_elf64_swap_dyn_in
2123 (bfd *, const void *, Elf_Internal_Dyn *);
2124 extern void bfd_elf64_swap_dyn_out
2125 (bfd *, const Elf_Internal_Dyn *, void *);
2126 extern long bfd_elf64_slurp_symbol_table
2127 (bfd *, asymbol **, bfd_boolean);
2128 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2130 extern int bfd_elf64_write_out_phdrs
2131 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2132 extern bfd_boolean bfd_elf64_checksum_contents
2133 (bfd * , void (*) (const void *, size_t, void *), void *);
2134 extern void bfd_elf64_write_relocs
2135 (bfd *, asection *, void *);
2136 extern bfd_boolean bfd_elf64_slurp_reloc_table
2137 (bfd *, asection *, asymbol **, bfd_boolean);
2139 extern bfd_boolean _bfd_elf_default_relocs_compatible
2140 (const bfd_target *, const bfd_target *);
2142 extern bfd_boolean _bfd_elf_relocs_compatible
2143 (const bfd_target *, const bfd_target *);
2145 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2146 (bfd *, struct bfd_link_info *, const char *);
2147 extern bfd_boolean bfd_elf_link_add_symbols
2148 (bfd *, struct bfd_link_info *);
2149 extern bfd_boolean _bfd_elf_add_dynamic_entry
2150 (struct bfd_link_info *, bfd_vma, bfd_vma);
2152 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2153 (struct bfd_link_info *, struct elf_link_hash_entry *);
2155 extern int bfd_elf_link_record_local_dynamic_symbol
2156 (struct bfd_link_info *, bfd *, long);
2158 extern bfd_boolean _bfd_elf_close_and_cleanup
2161 extern bfd_boolean _bfd_elf_common_definition
2162 (Elf_Internal_Sym *);
2164 extern unsigned int _bfd_elf_common_section_index
2167 extern asection *_bfd_elf_common_section
2170 extern bfd_vma _bfd_elf_default_got_elt_size
2171 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2174 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2175 (bfd *, arelent *, struct bfd_symbol *, void *,
2176 asection *, bfd *, char **);
2178 extern bfd_boolean bfd_elf_final_link
2179 (bfd *, struct bfd_link_info *);
2181 extern void _bfd_elf_gc_keep
2182 (struct bfd_link_info *info);
2184 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2185 (struct elf_link_hash_entry *h, void *inf);
2187 extern bfd_boolean bfd_elf_gc_sections
2188 (bfd *, struct bfd_link_info *);
2190 extern bfd_boolean bfd_elf_gc_record_vtinherit
2191 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2193 extern bfd_boolean bfd_elf_gc_record_vtentry
2194 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2196 extern asection *_bfd_elf_gc_mark_hook
2197 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2198 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2200 extern asection *_bfd_elf_gc_mark_rsec
2201 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2202 struct elf_reloc_cookie *);
2204 extern bfd_boolean _bfd_elf_gc_mark_reloc
2205 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2206 struct elf_reloc_cookie *);
2208 extern bfd_boolean _bfd_elf_gc_mark_fdes
2209 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2210 struct elf_reloc_cookie *);
2212 extern bfd_boolean _bfd_elf_gc_mark
2213 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2215 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2216 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2218 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2219 (bfd *, struct bfd_link_info *);
2221 extern bfd_boolean bfd_elf_gc_common_final_link
2222 (bfd *, struct bfd_link_info *);
2224 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2227 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2228 (bfd *, asection *);
2230 extern bfd_boolean _bfd_elf_map_sections_to_segments
2231 (bfd *, struct bfd_link_info *);
2233 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2235 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2238 extern int bfd_elf_get_default_section_type (flagword);
2240 extern bfd_boolean bfd_elf_lookup_section_flags
2241 (struct bfd_link_info *, struct flag_info *, asection *);
2243 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2244 (bfd * abfd, asection * section);
2246 /* Exported interface for writing elf corefile notes. */
2247 extern char *elfcore_write_note
2248 (bfd *, char *, int *, const char *, int, const void *, int);
2249 extern char *elfcore_write_prpsinfo
2250 (bfd *, char *, int *, const char *, const char *);
2251 extern char *elfcore_write_prstatus
2252 (bfd *, char *, int *, long, int, const void *);
2253 extern char * elfcore_write_pstatus
2254 (bfd *, char *, int *, long, int, const void *);
2255 extern char *elfcore_write_prfpreg
2256 (bfd *, char *, int *, const void *, int);
2257 extern char *elfcore_write_prxfpreg
2258 (bfd *, char *, int *, const void *, int);
2259 extern char *elfcore_write_xstatereg
2260 (bfd *, char *, int *, const void *, int);
2261 extern char *elfcore_write_ppc_vmx
2262 (bfd *, char *, int *, const void *, int);
2263 extern char *elfcore_write_ppc_vsx
2264 (bfd *, char *, int *, const void *, int);
2265 extern char *elfcore_write_s390_timer
2266 (bfd *, char *, int *, const void *, int);
2267 extern char *elfcore_write_s390_todcmp
2268 (bfd *, char *, int *, const void *, int);
2269 extern char *elfcore_write_s390_todpreg
2270 (bfd *, char *, int *, const void *, int);
2271 extern char *elfcore_write_s390_ctrs
2272 (bfd *, char *, int *, const void *, int);
2273 extern char *elfcore_write_s390_prefix
2274 (bfd *, char *, int *, const void *, int);
2275 extern char *elfcore_write_s390_last_break
2276 (bfd *, char *, int *, const void *, int);
2277 extern char *elfcore_write_s390_system_call
2278 (bfd *, char *, int *, const void *, int);
2279 extern char *elfcore_write_arm_vfp
2280 (bfd *, char *, int *, const void *, int);
2281 extern char *elfcore_write_aarch_tls
2282 (bfd *, char *, int *, const void *, int);
2283 extern char *elfcore_write_aarch_hw_break
2284 (bfd *, char *, int *, const void *, int);
2285 extern char *elfcore_write_aarch_hw_watch
2286 (bfd *, char *, int *, const void *, int);
2287 extern char *elfcore_write_lwpstatus
2288 (bfd *, char *, int *, long, int, const void *);
2289 extern char *elfcore_write_register_note
2290 (bfd *, char *, int *, const char *, const void *, int);
2292 /* Internal structure which holds information to be included in the
2293 PRPSINFO section of Linux core files.
2295 This is an "internal" structure in the sense that it should be used
2296 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2297 function), so things like endianess shouldn't be an issue. This
2298 structure will eventually be converted in one of the
2299 `elf_external_linux_*' structures and written out to an output bfd
2300 by one of the functions declared below. */
2302 struct elf_internal_linux_prpsinfo
2304 char pr_state; /* Numeric process state. */
2305 char pr_sname; /* Char for pr_state. */
2306 char pr_zomb; /* Zombie. */
2307 char pr_nice; /* Nice val. */
2308 unsigned long pr_flag; /* Flags. */
2309 unsigned int pr_uid;
2310 unsigned int pr_gid;
2311 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2312 char pr_fname[16 + 1]; /* Filename of executable. */
2313 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2316 /* Linux/most 32-bit archs. */
2317 extern char *elfcore_write_linux_prpsinfo32
2318 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2320 /* Linux/most 64-bit archs. */
2321 extern char *elfcore_write_linux_prpsinfo64
2322 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2324 /* Linux/PPC32 uses different layout compared to most archs. */
2325 extern char *elfcore_write_ppc_linux_prpsinfo32
2326 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2328 extern bfd *_bfd_elf32_bfd_from_remote_memory
2329 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2330 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2331 extern bfd *_bfd_elf64_bfd_from_remote_memory
2332 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2333 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2335 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2336 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2337 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2338 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2339 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2340 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2341 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2342 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2343 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2344 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2346 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2347 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2350 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2351 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2352 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2353 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2354 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2355 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2356 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2357 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2359 /* The linker may need to keep track of the number of relocs that it
2360 decides to copy as dynamic relocs in check_relocs for each symbol.
2361 This is so that it can later discard them if they are found to be
2362 unnecessary. We can store the information in a field extending the
2363 regular ELF linker hash table. */
2365 struct elf_dyn_relocs
2367 struct elf_dyn_relocs *next;
2369 /* The input section of the reloc. */
2372 /* Total number of relocs copied for the input section. */
2373 bfd_size_type count;
2375 /* Number of pc-relative relocs copied for the input section. */
2376 bfd_size_type pc_count;
2379 extern bfd_boolean _bfd_elf_create_ifunc_sections
2380 (bfd *, struct bfd_link_info *);
2381 extern asection * _bfd_elf_create_ifunc_dyn_reloc
2382 (bfd *, struct bfd_link_info *, asection *sec, asection *sreloc,
2383 struct elf_dyn_relocs **);
2384 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2385 (struct bfd_link_info *, struct elf_link_hash_entry *,
2386 struct elf_dyn_relocs **, unsigned int, unsigned int);
2388 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2389 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2391 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2392 extern bfd_vma elf64_r_sym (bfd_vma);
2393 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2394 extern bfd_vma elf32_r_sym (bfd_vma);
2396 /* Large common section. */
2397 extern asection _bfd_elf_large_com_section;
2399 /* Hash for local symbol with the first section id, ID, in the input
2400 file and the local symbol index, SYM. */
2401 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2402 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2403 ^ (SYM) ^ ((ID) >> 16))
2405 /* This is the condition under which finish_dynamic_symbol will be called.
2406 If our finish_dynamic_symbol isn't called, we'll need to do something
2407 about initializing any .plt and .got entries in relocate_section. */
2408 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2410 && ((SHARED) || !(H)->forced_local) \
2411 && ((H)->dynindx != -1 || (H)->forced_local))
2413 /* This macro is to avoid lots of duplicated code in the body
2414 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2415 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2416 r_symndx, symtab_hdr, sym_hashes, \
2417 h, sec, relocation, \
2418 unresolved_reloc, warned) \
2421 /* It seems this can happen with erroneous or unsupported \
2422 input (mixing a.out and elf in an archive, for example.) */ \
2423 if (sym_hashes == NULL) \
2426 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2428 while (h->root.type == bfd_link_hash_indirect \
2429 || h->root.type == bfd_link_hash_warning) \
2430 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2433 unresolved_reloc = FALSE; \
2435 if (h->root.type == bfd_link_hash_defined \
2436 || h->root.type == bfd_link_hash_defweak) \
2438 sec = h->root.u.def.section; \
2440 || sec->output_section == NULL) \
2441 /* Set a flag that will be cleared later if we find a \
2442 relocation value for this symbol. output_section \
2443 is typically NULL for symbols satisfied by a shared \
2445 unresolved_reloc = TRUE; \
2447 relocation = (h->root.u.def.value \
2448 + sec->output_section->vma \
2449 + sec->output_offset); \
2451 else if (h->root.type == bfd_link_hash_undefweak) \
2453 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2454 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2456 else if (!info->relocatable) \
2459 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2460 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2461 if (!info->callbacks->undefined_symbol (info, \
2462 h->root.root.string, \
2465 rel->r_offset, err)) \
2469 (void) unresolved_reloc; \
2474 /* This macro is to avoid lots of duplicated code in the body of the
2475 loop over relocations in xxx_relocate_section() in the various
2478 Handle relocations against symbols from removed linkonce sections,
2479 or sections discarded by a linker script. When doing a relocatable
2480 link, we remove such relocations. Otherwise, we just want the
2481 section contents zeroed and avoid any special processing. */
2482 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2483 rel, count, relend, \
2484 howto, index, contents) \
2487 _bfd_clear_contents (howto, input_bfd, input_section, \
2488 contents + rel[index].r_offset); \
2490 if (info->relocatable \
2491 && (input_section->flags & SEC_DEBUGGING)) \
2493 /* Only remove relocations in debug sections since other \
2494 sections may require relocations. */ \
2495 Elf_Internal_Shdr *rel_hdr; \
2497 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2499 /* Avoid empty output section. */ \
2500 if (rel_hdr->sh_size > count * rel_hdr->sh_entsize) \
2502 rel_hdr->sh_size -= count * rel_hdr->sh_entsize; \
2503 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2504 rel_hdr->sh_size -= count * rel_hdr->sh_entsize; \
2506 memmove (rel, rel + count, \
2507 (relend - rel - count) * sizeof (*rel)); \
2509 input_section->reloc_count -= count; \
2516 for (i_ = 0; i_ < count; i_++) \
2518 rel[i_].r_info = 0; \
2519 rel[i_].r_addend = 0; \
2525 /* Will a symbol be bound to the definition within the shared
2526 library, if any. A unique symbol can never be bound locally. */
2527 #define SYMBOLIC_BIND(INFO, H) \
2528 (!(H)->unique_global \
2529 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2531 #endif /* _LIBELF_H_ */