1 /* bfdlink.h -- header file for BFD link routines
2 Copyright (C) 1993-2016 Free Software Foundation, Inc.
3 Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
25 /* Which symbols to strip during a link. */
28 strip_none
, /* Don't strip any symbols. */
29 strip_debugger
, /* Strip debugging symbols. */
30 strip_some
, /* keep_hash is the list of symbols to keep. */
31 strip_all
/* Strip all symbols. */
34 /* Which local symbols to discard during a link. This is irrelevant
35 if strip_all is used. */
38 discard_sec_merge
, /* Discard local temporary symbols in SEC_MERGE
40 discard_none
, /* Don't discard any locals. */
41 discard_l
, /* Discard local temporary symbols. */
42 discard_all
/* Discard all locals. */
45 /* Whether to generate ELF common symbols with the STT_COMMON type
46 during a relocatable link. */
47 enum bfd_link_elf_stt_common
54 /* Describes the type of hash table entry structure being used.
55 Different hash table structure have different fields and so
56 support different linking features. */
57 enum bfd_link_hash_table_type
59 bfd_link_generic_hash_table
,
60 bfd_link_elf_hash_table
63 /* These are the possible types of an entry in the BFD link hash
66 enum bfd_link_hash_type
68 bfd_link_hash_new
, /* Symbol is new. */
69 bfd_link_hash_undefined
, /* Symbol seen before, but undefined. */
70 bfd_link_hash_undefweak
, /* Symbol is weak and undefined. */
71 bfd_link_hash_defined
, /* Symbol is defined. */
72 bfd_link_hash_defweak
, /* Symbol is weak and defined. */
73 bfd_link_hash_common
, /* Symbol is common. */
74 bfd_link_hash_indirect
, /* Symbol is an indirect link. */
75 bfd_link_hash_warning
/* Like indirect, but warn if referenced. */
78 enum bfd_link_common_skip_ar_symbols
80 bfd_link_common_skip_none
,
81 bfd_link_common_skip_text
,
82 bfd_link_common_skip_data
,
83 bfd_link_common_skip_all
86 struct bfd_link_hash_common_entry
88 unsigned int alignment_power
; /* Alignment. */
89 asection
*section
; /* Symbol section. */
92 /* The linking routines use a hash table which uses this structure for
95 struct bfd_link_hash_entry
97 /* Base hash table entry structure. */
98 struct bfd_hash_entry root
;
100 /* Type of this entry. */
101 ENUM_BITFIELD (bfd_link_hash_type
) type
: 8;
103 /* Symbol is referenced in a normal object file, as distict from a LTO
105 unsigned int non_ir_ref
: 1;
107 /* Symbol is a built-in define. These will be overridden by PROVIDE
108 in a linker script. */
109 unsigned int linker_def
: 1;
111 /* Symbol defined in a linker script. */
112 unsigned int ldscript_def
: 1;
114 /* A union of information depending upon the type. */
117 /* Nothing is kept for bfd_hash_new. */
118 /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */
121 /* Undefined and common symbols are kept in a linked list through
122 this field. This field is present in all of the union element
123 so that we don't need to remove entries from the list when we
124 change their type. Removing entries would either require the
125 list to be doubly linked, which would waste more memory, or
126 require a traversal. When an undefined or common symbol is
127 created, it should be added to this list, the head of which is in
128 the link hash table itself. As symbols are defined, they need
129 not be removed from the list; anything which reads the list must
130 doublecheck the symbol type.
132 Weak symbols are not kept on this list.
134 Defined and defweak symbols use this field as a reference marker.
135 If the field is not NULL, or this structure is the tail of the
136 undefined symbol list, the symbol has been referenced. If the
137 symbol is undefined and becomes defined, this field will
138 automatically be non-NULL since the symbol will have been on the
139 undefined symbol list. */
140 struct bfd_link_hash_entry
*next
;
141 /* BFD symbol was found in. */
143 /* For __start_<name> and __stop_<name> symbols, the first
144 input section matching the name. */
147 /* bfd_link_hash_defined, bfd_link_hash_defweak. */
150 struct bfd_link_hash_entry
*next
;
151 /* Symbol section. */
156 /* bfd_link_hash_indirect, bfd_link_hash_warning. */
159 struct bfd_link_hash_entry
*next
;
161 struct bfd_link_hash_entry
*link
;
162 /* Warning message (bfd_link_hash_warning only). */
165 /* bfd_link_hash_common. */
168 struct bfd_link_hash_entry
*next
;
169 /* The linker needs to know three things about common
170 symbols: the size, the alignment, and the section in
171 which the symbol should be placed. We store the size
172 here, and we allocate a small structure to hold the
173 section and the alignment. The alignment is stored as a
174 power of two. We don't store all the information
175 directly because we don't want to increase the size of
176 the union; this structure is a major space user in the
178 struct bfd_link_hash_common_entry
*p
;
179 /* Common symbol size. */
185 /* This is the link hash table. It is a derived class of
188 struct bfd_link_hash_table
190 /* The hash table itself. */
191 struct bfd_hash_table table
;
192 /* A linked list of undefined and common symbols, linked through the
193 next field in the bfd_link_hash_entry structure. */
194 struct bfd_link_hash_entry
*undefs
;
195 /* Entries are added to the tail of the undefs list. */
196 struct bfd_link_hash_entry
*undefs_tail
;
197 /* Function to free the hash table on closing BFD. */
198 void (*hash_table_free
) (bfd
*);
199 /* The type of the link hash table. */
200 enum bfd_link_hash_table_type type
;
203 /* Look up an entry in a link hash table. If FOLLOW is TRUE, this
204 follows bfd_link_hash_indirect and bfd_link_hash_warning links to
206 extern struct bfd_link_hash_entry
*bfd_link_hash_lookup
207 (struct bfd_link_hash_table
*, const char *, bfd_boolean create
,
208 bfd_boolean copy
, bfd_boolean follow
);
210 /* Look up an entry in the main linker hash table if the symbol might
211 be wrapped. This should only be used for references to an
212 undefined symbol, not for definitions of a symbol. */
214 extern struct bfd_link_hash_entry
*bfd_wrapped_link_hash_lookup
215 (bfd
*, struct bfd_link_info
*, const char *, bfd_boolean
,
216 bfd_boolean
, bfd_boolean
);
218 /* If H is a wrapped symbol, ie. the symbol name starts with "__wrap_"
219 and the remainder is found in wrap_hash, return the real symbol. */
221 extern struct bfd_link_hash_entry
*unwrap_hash_lookup
222 (struct bfd_link_info
*, bfd
*, struct bfd_link_hash_entry
*);
224 /* Traverse a link hash table. */
225 extern void bfd_link_hash_traverse
226 (struct bfd_link_hash_table
*,
227 bfd_boolean (*) (struct bfd_link_hash_entry
*, void *),
230 /* Add an entry to the undefs list. */
231 extern void bfd_link_add_undef
232 (struct bfd_link_hash_table
*, struct bfd_link_hash_entry
*);
234 /* Remove symbols from the undefs list that don't belong there. */
235 extern void bfd_link_repair_undef_list
236 (struct bfd_link_hash_table
*table
);
238 /* Read symbols and cache symbol pointer array in outsymbols. */
239 extern bfd_boolean
bfd_generic_link_read_symbols (bfd
*);
241 /* Check the relocs in the BFD. Called after all the input
242 files have been loaded, and garbage collection has tagged
243 any unneeded sections. */
244 extern bfd_boolean
bfd_link_check_relocs (bfd
*,struct bfd_link_info
*);
248 struct bfd_sym_chain
*next
;
252 /* How to handle unresolved symbols.
253 There are four possibilities which are enumerated below: */
256 /* This is the initial value when then link_info structure is created.
257 It allows the various stages of the linker to determine whether they
258 allowed to set the value. */
265 typedef enum {with_flags
, without_flags
} flag_type
;
267 /* A section flag list. */
268 struct flag_info_list
273 struct flag_info_list
*next
;
276 /* Section flag info. */
279 flagword only_with_flags
;
280 flagword not_with_flags
;
281 struct flag_info_list
*flag_list
;
282 bfd_boolean flags_initialized
;
285 struct bfd_elf_dynamic_list
;
286 struct bfd_elf_version_tree
;
288 /* Types of output. */
298 #define bfd_link_pde(info) ((info)->type == type_pde)
299 #define bfd_link_dll(info) ((info)->type == type_dll)
300 #define bfd_link_relocatable(info) ((info)->type == type_relocatable)
301 #define bfd_link_pie(info) ((info)->type == type_pie)
302 #define bfd_link_executable(info) (bfd_link_pde (info) || bfd_link_pie (info))
303 #define bfd_link_pic(info) (bfd_link_dll (info) || bfd_link_pie (info))
305 /* This structure holds all the information needed to communicate
306 between BFD and the linker when doing a link. */
311 ENUM_BITFIELD (output_type
) type
: 2;
313 /* TRUE if BFD should pre-bind symbols in a shared object. */
314 unsigned int symbolic
: 1;
316 /* TRUE if executable should not contain copy relocs.
317 Setting this true may result in a non-sharable text segment. */
318 unsigned int nocopyreloc
: 1;
320 /* TRUE if BFD should export all symbols in the dynamic symbol table
321 of an executable, rather than only those used. */
322 unsigned int export_dynamic
: 1;
324 /* TRUE if a default symbol version should be created and used for
326 unsigned int create_default_symver
: 1;
328 /* TRUE if unreferenced sections should be removed. */
329 unsigned int gc_sections
: 1;
331 /* TRUE if every symbol should be reported back via the notice
333 unsigned int notice_all
: 1;
335 /* TRUE if the LTO plugin is active. */
336 unsigned int lto_plugin_active
: 1;
338 /* TRUE if global symbols in discarded sections should be stripped. */
339 unsigned int strip_discarded
: 1;
341 /* TRUE if all data symbols should be dynamic. */
342 unsigned int dynamic_data
: 1;
344 /* Which symbols to strip. */
345 ENUM_BITFIELD (bfd_link_strip
) strip
: 2;
347 /* Which local symbols to discard. */
348 ENUM_BITFIELD (bfd_link_discard
) discard
: 2;
350 /* Whether to generate ELF common symbols with the STT_COMMON type. */
351 ENUM_BITFIELD (bfd_link_elf_stt_common
) elf_stt_common
: 2;
353 /* Criteria for skipping symbols when determining
354 whether to include an object from an archive. */
355 ENUM_BITFIELD (bfd_link_common_skip_ar_symbols
) common_skip_ar_symbols
: 2;
357 /* What to do with unresolved symbols in an object file.
358 When producing executables the default is GENERATE_ERROR.
359 When producing shared libraries the default is IGNORE. The
360 assumption with shared libraries is that the reference will be
361 resolved at load/execution time. */
362 ENUM_BITFIELD (report_method
) unresolved_syms_in_objects
: 2;
364 /* What to do with unresolved symbols in a shared library.
365 The same defaults apply. */
366 ENUM_BITFIELD (report_method
) unresolved_syms_in_shared_libs
: 2;
368 /* TRUE if shared objects should be linked directly, not shared. */
369 unsigned int static_link
: 1;
371 /* TRUE if symbols should be retained in memory, FALSE if they
372 should be freed and reread. */
373 unsigned int keep_memory
: 1;
375 /* TRUE if BFD should generate relocation information in the final
377 unsigned int emitrelocations
: 1;
379 /* TRUE if PT_GNU_RELRO segment should be created. */
380 unsigned int relro
: 1;
382 /* Nonzero if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment
383 should be created. 1 for DWARF2 tables, 2 for compact tables. */
384 unsigned int eh_frame_hdr_type
: 2;
386 /* TRUE if we should warn when adding a DT_TEXTREL to a shared object. */
387 unsigned int warn_shared_textrel
: 1;
389 /* TRUE if we should error when adding a DT_TEXTREL. */
390 unsigned int error_textrel
: 1;
392 /* TRUE if .hash section should be created. */
393 unsigned int emit_hash
: 1;
395 /* TRUE if .gnu.hash section should be created. */
396 unsigned int emit_gnu_hash
: 1;
398 /* If TRUE reduce memory overheads, at the expense of speed. This will
399 cause map file generation to use an O(N^2) algorithm and disable
400 caching ELF symbol buffer. */
401 unsigned int reduce_memory_overheads
: 1;
403 /* TRUE if the output file should be in a traditional format. This
404 is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag
405 on the output file, but may be checked when reading the input
407 unsigned int traditional_format
: 1;
409 /* TRUE if non-PLT relocs should be merged into one reloc section
410 and sorted so that relocs against the same symbol come together. */
411 unsigned int combreloc
: 1;
413 /* TRUE if a default symbol version should be created and used for
415 unsigned int default_imported_symver
: 1;
417 /* TRUE if the new ELF dynamic tags are enabled. */
418 unsigned int new_dtags
: 1;
420 /* FALSE if .eh_frame unwind info should be generated for PLT and other
421 linker created sections, TRUE if it should be omitted. */
422 unsigned int no_ld_generated_unwind_info
: 1;
424 /* TRUE if BFD should generate a "task linked" object file,
425 similar to relocatable but also with globals converted to
427 unsigned int task_link
: 1;
429 /* TRUE if ok to have multiple definition. */
430 unsigned int allow_multiple_definition
: 1;
432 /* TRUE if ok to have version with no definition. */
433 unsigned int allow_undefined_version
: 1;
435 /* TRUE if some symbols have to be dynamic, controlled by
436 --dynamic-list command line options. */
437 unsigned int dynamic
: 1;
439 /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X
441 unsigned int execstack
: 1;
443 /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W
445 unsigned int noexecstack
: 1;
447 /* TRUE if we want to produced optimized output files. This might
448 need much more time and therefore must be explicitly selected. */
449 unsigned int optimize
: 1;
451 /* TRUE if user should be informed of removed unreferenced sections. */
452 unsigned int print_gc_sections
: 1;
454 /* TRUE if we should warn alternate ELF machine code. */
455 unsigned int warn_alternate_em
: 1;
457 /* TRUE if the linker script contained an explicit PHDRS command. */
458 unsigned int user_phdrs
: 1;
460 /* TRUE if we should check relocations after all input files have
462 unsigned int check_relocs_after_open_input
: 1;
464 /* TRUE if BND prefix in PLT entries is always generated. */
465 unsigned int bndplt
: 1;
467 /* TRUE if generation of .interp/PT_INTERP should be suppressed. */
468 unsigned int nointerp
: 1;
470 /* TRUE if we shouldn't check relocation overflow. */
471 unsigned int no_reloc_overflow_check
: 1;
473 /* TRUE if generate a 1-byte NOP as suffix for x86 call instruction. */
474 unsigned int call_nop_as_suffix
: 1;
476 /* The 1-byte NOP for x86 call instruction. */
479 /* Char that may appear as the first char of a symbol, but should be
480 skipped (like symbol_leading_char) when looking up symbols in
481 wrap_hash. Used by PowerPC Linux for 'dot' symbols. */
484 /* Separator between archive and filename in linker script filespecs. */
487 /* Compress DWARF debug sections. */
488 enum compressed_debug_section_type compress_debug
;
490 /* Default stack size. Zero means default (often zero itself), -1
491 means explicitly zero-sized. */
492 bfd_signed_vma stacksize
;
494 /* Enable or disable target specific optimizations.
496 Not all targets have optimizations to enable.
498 Normally these optimizations are disabled by default but some targets
499 prefer to enable them by default. So this field is a tri-state variable.
502 zero: Enable the optimizations (either from --relax being specified on
503 the command line or the backend's before_allocation emulation function.
505 positive: The user has requested that these optimizations be disabled.
506 (Via the --no-relax command line option).
508 negative: The optimizations are disabled. (Set when initializing the
509 args_type structure in ldmain.c:main. */
510 signed int disable_target_specific_optimizations
;
512 /* Function callbacks. */
513 const struct bfd_link_callbacks
*callbacks
;
515 /* Hash table handled by BFD. */
516 struct bfd_link_hash_table
*hash
;
518 /* Hash table of symbols to keep. This is NULL unless strip is
520 struct bfd_hash_table
*keep_hash
;
522 /* Hash table of symbols to report back via the notice callback. If
523 this is NULL, and notice_all is FALSE, then no symbols are
525 struct bfd_hash_table
*notice_hash
;
527 /* Hash table of symbols which are being wrapped (the --wrap linker
528 option). If this is NULL, no symbols are being wrapped. */
529 struct bfd_hash_table
*wrap_hash
;
531 /* Hash table of symbols which may be left unresolved during
532 a link. If this is NULL, no symbols can be left unresolved. */
533 struct bfd_hash_table
*ignore_hash
;
535 /* The output BFD. */
538 /* The import library generated. */
541 /* The list of input BFD's involved in the link. These are chained
542 together via the link.next field. */
544 bfd
**input_bfds_tail
;
546 /* If a symbol should be created for each input BFD, this is section
547 where those symbols should be placed. It must be a section in
548 the output BFD. It may be NULL, in which case no such symbols
549 will be created. This is to support CREATE_OBJECT_SYMBOLS in the
550 linker command language. */
551 asection
*create_object_symbols_section
;
553 /* List of global symbol names that are starting points for marking
554 sections against garbage collection. */
555 struct bfd_sym_chain
*gc_sym_list
;
557 /* If a base output file is wanted, then this points to it */
560 /* The function to call when the executable or shared object is
562 const char *init_function
;
564 /* The function to call when the executable or shared object is
566 const char *fini_function
;
568 /* Number of relaxation passes. Usually only one relaxation pass
569 is needed. But a backend can have as many relaxation passes as
570 necessary. During bfd_relax_section call, it is set to the
571 current pass, starting from 0. */
574 /* Number of relaxation trips. This number is incremented every
575 time the relaxation pass is restarted due to a previous
576 relaxation returning true in *AGAIN. */
579 /* > 0 to treat protected data defined in the shared library as
580 reference external. 0 to treat it as internal. -1 to let
581 backend to decide. */
582 int extern_protected_data
;
584 /* > 0 to treat undefined weak symbol in the executable as dynamic,
585 requiring dynamic relocation. */
586 int dynamic_undefined_weak
;
588 /* Non-zero if auto-import thunks for DATA items in pei386 DLLs
589 should be generated/linked against. Set to 1 if this feature
590 is explicitly requested by the user, -1 if enabled by default. */
591 int pei386_auto_import
;
593 /* Non-zero if runtime relocs for DATA items with non-zero addends
594 in pei386 DLLs should be generated. Set to 1 if this feature
595 is explicitly requested by the user, -1 if enabled by default. */
596 int pei386_runtime_pseudo_reloc
;
598 /* How many spare .dynamic DT_NULL entries should be added? */
599 unsigned int spare_dynamic_tags
;
601 /* May be used to set DT_FLAGS for ELF. */
604 /* May be used to set DT_FLAGS_1 for ELF. */
607 /* Start and end of RELRO region. */
608 bfd_vma relro_start
, relro_end
;
610 /* List of symbols should be dynamic. */
611 struct bfd_elf_dynamic_list
*dynamic_list
;
613 /* The version information. */
614 struct bfd_elf_version_tree
*version_info
;
617 /* This structures holds a set of callback functions. These are called
618 by the BFD linker routines. */
620 struct bfd_link_callbacks
622 /* A function which is called when an object is added from an
623 archive. ABFD is the archive element being added. NAME is the
624 name of the symbol which caused the archive element to be pulled
625 in. This function may set *SUBSBFD to point to an alternative
626 BFD from which symbols should in fact be added in place of the
627 original BFD's symbols. Returns TRUE if the object should be
628 added, FALSE if it should be skipped. */
629 bfd_boolean (*add_archive_element
)
630 (struct bfd_link_info
*, bfd
*abfd
, const char *name
, bfd
**subsbfd
);
631 /* A function which is called when a symbol is found with multiple
632 definitions. H is the symbol which is defined multiple times.
633 NBFD is the new BFD, NSEC is the new section, and NVAL is the new
634 value. NSEC may be bfd_com_section or bfd_ind_section. */
635 void (*multiple_definition
)
636 (struct bfd_link_info
*, struct bfd_link_hash_entry
*h
,
637 bfd
*nbfd
, asection
*nsec
, bfd_vma nval
);
638 /* A function which is called when a common symbol is defined
639 multiple times. H is the symbol appearing multiple times.
640 NBFD is the BFD of the new symbol. NTYPE is the type of the new
641 symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or
642 bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE
643 is the size of the new symbol. */
644 void (*multiple_common
)
645 (struct bfd_link_info
*, struct bfd_link_hash_entry
*h
,
646 bfd
*nbfd
, enum bfd_link_hash_type ntype
, bfd_vma nsize
);
647 /* A function which is called to add a symbol to a set. ENTRY is
648 the link hash table entry for the set itself (e.g.,
649 __CTOR_LIST__). RELOC is the relocation to use for an entry in
650 the set when generating a relocatable file, and is also used to
651 get the size of the entry when generating an executable file.
652 ABFD, SEC and VALUE identify the value to add to the set. */
654 (struct bfd_link_info
*, struct bfd_link_hash_entry
*entry
,
655 bfd_reloc_code_real_type reloc
, bfd
*abfd
, asection
*sec
, bfd_vma value
);
656 /* A function which is called when the name of a g++ constructor or
657 destructor is found. This is only called by some object file
658 formats. CONSTRUCTOR is TRUE for a constructor, FALSE for a
659 destructor. This will use BFD_RELOC_CTOR when generating a
660 relocatable file. NAME is the name of the symbol found. ABFD,
661 SECTION and VALUE are the value of the symbol. */
663 (struct bfd_link_info
*, bfd_boolean constructor
, const char *name
,
664 bfd
*abfd
, asection
*sec
, bfd_vma value
);
665 /* A function which is called to issue a linker warning. For
666 example, this is called when there is a reference to a warning
667 symbol. WARNING is the warning to be issued. SYMBOL is the name
668 of the symbol which triggered the warning; it may be NULL if
669 there is none. ABFD, SECTION and ADDRESS identify the location
670 which trigerred the warning; either ABFD or SECTION or both may
671 be NULL if the location is not known. */
673 (struct bfd_link_info
*, const char *warning
, const char *symbol
,
674 bfd
*abfd
, asection
*section
, bfd_vma address
);
675 /* A function which is called when a relocation is attempted against
676 an undefined symbol. NAME is the symbol which is undefined.
677 ABFD, SECTION and ADDRESS identify the location from which the
678 reference is made. IS_FATAL indicates whether an undefined symbol is
679 a fatal error or not. In some cases SECTION may be NULL. */
680 void (*undefined_symbol
)
681 (struct bfd_link_info
*, const char *name
, bfd
*abfd
,
682 asection
*section
, bfd_vma address
, bfd_boolean is_fatal
);
683 /* A function which is called when a reloc overflow occurs. ENTRY is
684 the link hash table entry for the symbol the reloc is against.
685 NAME is the name of the local symbol or section the reloc is
686 against, RELOC_NAME is the name of the relocation, and ADDEND is
687 any addend that is used. ABFD, SECTION and ADDRESS identify the
688 location at which the overflow occurs; if this is the result of a
689 bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
690 ABFD will be NULL. */
691 void (*reloc_overflow
)
692 (struct bfd_link_info
*, struct bfd_link_hash_entry
*entry
,
693 const char *name
, const char *reloc_name
, bfd_vma addend
,
694 bfd
*abfd
, asection
*section
, bfd_vma address
);
695 /* A function which is called when a dangerous reloc is performed.
696 MESSAGE is an appropriate message.
697 ABFD, SECTION and ADDRESS identify the location at which the
698 problem occurred; if this is the result of a
699 bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
700 ABFD will be NULL. */
701 void (*reloc_dangerous
)
702 (struct bfd_link_info
*, const char *message
,
703 bfd
*abfd
, asection
*section
, bfd_vma address
);
704 /* A function which is called when a reloc is found to be attached
705 to a symbol which is not being written out. NAME is the name of
706 the symbol. ABFD, SECTION and ADDRESS identify the location of
707 the reloc; if this is the result of a
708 bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
709 ABFD will be NULL. */
710 void (*unattached_reloc
)
711 (struct bfd_link_info
*, const char *name
,
712 bfd
*abfd
, asection
*section
, bfd_vma address
);
713 /* A function which is called when a symbol in notice_hash is
714 defined or referenced. H is the symbol, INH the indirect symbol
715 if applicable. ABFD, SECTION and ADDRESS are the (new) value of
716 the symbol. If SECTION is bfd_und_section, this is a reference.
717 FLAGS are the symbol BSF_* flags. */
718 bfd_boolean (*notice
)
719 (struct bfd_link_info
*, struct bfd_link_hash_entry
*h
,
720 struct bfd_link_hash_entry
*inh
,
721 bfd
*abfd
, asection
*section
, bfd_vma address
, flagword flags
);
722 /* Error or warning link info message. */
724 (const char *fmt
, ...);
725 /* General link info message. */
727 (const char *fmt
, ...);
728 /* Message to be printed in linker map file. */
730 (const char *fmt
, ...);
731 /* This callback provides a chance for users of the BFD library to
732 override its decision about whether to place two adjacent sections
733 into the same segment. */
734 bfd_boolean (*override_segment_assignment
)
735 (struct bfd_link_info
*, bfd
* abfd
,
736 asection
* current_section
, asection
* previous_section
,
737 bfd_boolean new_segment
);
740 /* The linker builds link_order structures which tell the code how to
741 include input data in the output file. */
743 /* These are the types of link_order structures. */
745 enum bfd_link_order_type
747 bfd_undefined_link_order
, /* Undefined. */
748 bfd_indirect_link_order
, /* Built from a section. */
749 bfd_data_link_order
, /* Set to explicit data. */
750 bfd_section_reloc_link_order
, /* Relocate against a section. */
751 bfd_symbol_reloc_link_order
/* Relocate against a symbol. */
754 /* This is the link_order structure itself. These form a chain
755 attached to the output section whose contents they are describing. */
757 struct bfd_link_order
759 /* Next link_order in chain. */
760 struct bfd_link_order
*next
;
761 /* Type of link_order. */
762 enum bfd_link_order_type type
;
763 /* Offset within output section. */
765 /* Size within output section. */
767 /* Type specific information. */
772 /* Section to include. If this is used, then
773 section->output_section must be the section the
774 link_order is attached to, section->output_offset must
775 equal the link_order offset field, and section->size
776 must equal the link_order size field. Maybe these
777 restrictions should be relaxed someday. */
782 /* Size of contents, or zero when contents should be filled by
783 the architecture-dependent fill function.
784 A non-zero value allows filling of the output section
785 with an arbitrary repeated pattern. */
787 /* Data to put into file. */
792 /* Description of reloc to generate. Used for
793 bfd_section_reloc_link_order and
794 bfd_symbol_reloc_link_order. */
795 struct bfd_link_order_reloc
*p
;
800 /* A linker order of type bfd_section_reloc_link_order or
801 bfd_symbol_reloc_link_order means to create a reloc against a
802 section or symbol, respectively. This is used to implement -Ur to
803 generate relocs for the constructor tables. The
804 bfd_link_order_reloc structure describes the reloc that BFD should
805 create. It is similar to a arelent, but I didn't use arelent
806 because the linker does not know anything about most symbols, and
807 any asymbol structure it creates will be partially meaningless.
808 This information could logically be in the bfd_link_order struct,
809 but I didn't want to waste the space since these types of relocs
810 are relatively rare. */
812 struct bfd_link_order_reloc
815 bfd_reloc_code_real_type reloc
;
819 /* For type bfd_section_reloc_link_order, this is the section
820 the reloc should be against. This must be a section in the
821 output BFD, not any of the input BFDs. */
823 /* For type bfd_symbol_reloc_link_order, this is the name of the
824 symbol the reloc should be against. */
828 /* Addend to use. The object file should contain zero. The BFD
829 backend is responsible for filling in the contents of the object
830 file correctly. For some object file formats (e.g., COFF) the
831 addend must be stored into in the object file, and for some
832 (e.g., SPARC a.out) it is kept in the reloc. */
836 /* Allocate a new link_order for a section. */
837 extern struct bfd_link_order
*bfd_new_link_order (bfd
*, asection
*);
839 /* These structures are used to describe version information for the
840 ELF linker. These structures could be manipulated entirely inside
841 BFD, but it would be a pain. Instead, the regular linker sets up
842 these structures, and then passes them into BFD. */
844 /* Glob pattern for a version. */
846 struct bfd_elf_version_expr
848 /* Next glob pattern for this version. */
849 struct bfd_elf_version_expr
*next
;
852 /* Set if pattern is not a glob. */
853 unsigned int literal
: 1;
854 /* Defined by ".symver". */
855 unsigned int symver
: 1;
856 /* Defined by version script. */
857 unsigned int script
: 1;
859 #define BFD_ELF_VERSION_C_TYPE 1
860 #define BFD_ELF_VERSION_CXX_TYPE 2
861 #define BFD_ELF_VERSION_JAVA_TYPE 4
862 unsigned int mask
: 3;
865 struct bfd_elf_version_expr_head
867 /* List of all patterns, both wildcards and non-wildcards. */
868 struct bfd_elf_version_expr
*list
;
869 /* Hash table for non-wildcards. */
871 /* Remaining patterns. */
872 struct bfd_elf_version_expr
*remaining
;
873 /* What kind of pattern types are present in list (bitmask). */
877 /* Version dependencies. */
879 struct bfd_elf_version_deps
881 /* Next dependency for this version. */
882 struct bfd_elf_version_deps
*next
;
883 /* The version which this version depends upon. */
884 struct bfd_elf_version_tree
*version_needed
;
887 /* A node in the version tree. */
889 struct bfd_elf_version_tree
892 struct bfd_elf_version_tree
*next
;
893 /* Name of this version. */
895 /* Version number. */
897 /* Regular expressions for global symbols in this version. */
898 struct bfd_elf_version_expr_head globals
;
899 /* Regular expressions for local symbols in this version. */
900 struct bfd_elf_version_expr_head locals
;
901 /* List of versions which this version depends upon. */
902 struct bfd_elf_version_deps
*deps
;
903 /* Index of the version name. This is used within BFD. */
904 unsigned int name_indx
;
905 /* Whether this version tree was used. This is used within BFD. */
908 struct bfd_elf_version_expr
*(*match
)
909 (struct bfd_elf_version_expr_head
*head
,
910 struct bfd_elf_version_expr
*prev
, const char *sym
);
913 struct bfd_elf_dynamic_list
915 struct bfd_elf_version_expr_head head
;
916 struct bfd_elf_version_expr
*(*match
)
917 (struct bfd_elf_version_expr_head
*head
,
918 struct bfd_elf_version_expr
*prev
, const char *sym
);