1 /* bfdlink.h -- header file for BFD link routines
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5 Written by Steve Chamberlain and Ian Lance Taylor, 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 /* Which symbols to strip during a link. */
30 strip_none
, /* Don't strip any symbols. */
31 strip_debugger
, /* Strip debugging symbols. */
32 strip_some
, /* keep_hash is the list of symbols to keep. */
33 strip_all
/* Strip all symbols. */
36 /* Which local symbols to discard during a link. This is irrelevant
37 if strip_all is used. */
40 discard_sec_merge
, /* Discard local temporary symbols in SEC_MERGE
42 discard_none
, /* Don't discard any locals. */
43 discard_l
, /* Discard local temporary symbols. */
44 discard_all
/* Discard all locals. */
47 /* Describes the type of hash table entry structure being used.
48 Different hash table structure have different fields and so
49 support different linking features. */
50 enum bfd_link_hash_table_type
52 bfd_link_generic_hash_table
,
53 bfd_link_elf_hash_table
56 /* These are the possible types of an entry in the BFD link hash
59 enum bfd_link_hash_type
61 bfd_link_hash_new
, /* Symbol is new. */
62 bfd_link_hash_undefined
, /* Symbol seen before, but undefined. */
63 bfd_link_hash_undefweak
, /* Symbol is weak and undefined. */
64 bfd_link_hash_defined
, /* Symbol is defined. */
65 bfd_link_hash_defweak
, /* Symbol is weak and defined. */
66 bfd_link_hash_common
, /* Symbol is common. */
67 bfd_link_hash_indirect
, /* Symbol is an indirect link. */
68 bfd_link_hash_warning
/* Like indirect, but warn if referenced. */
71 enum bfd_link_common_skip_ar_symbols
73 bfd_link_common_skip_none
,
74 bfd_link_common_skip_text
,
75 bfd_link_common_skip_data
,
76 bfd_link_common_skip_all
79 struct bfd_link_hash_common_entry
81 unsigned int alignment_power
; /* Alignment. */
82 asection
*section
; /* Symbol section. */
85 /* The linking routines use a hash table which uses this structure for
88 struct bfd_link_hash_entry
90 /* Base hash table entry structure. */
91 struct bfd_hash_entry root
;
93 /* Type of this entry. */
94 ENUM_BITFIELD (bfd_link_hash_type
) type
: 8;
96 unsigned int non_ir_ref
: 1;
98 /* A union of information depending upon the type. */
101 /* Nothing is kept for bfd_hash_new. */
102 /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */
105 /* Undefined and common symbols are kept in a linked list through
106 this field. This field is present in all of the union element
107 so that we don't need to remove entries from the list when we
108 change their type. Removing entries would either require the
109 list to be doubly linked, which would waste more memory, or
110 require a traversal. When an undefined or common symbol is
111 created, it should be added to this list, the head of which is in
112 the link hash table itself. As symbols are defined, they need
113 not be removed from the list; anything which reads the list must
114 doublecheck the symbol type.
116 Weak symbols are not kept on this list.
118 Defined and defweak symbols use this field as a reference marker.
119 If the field is not NULL, or this structure is the tail of the
120 undefined symbol list, the symbol has been referenced. If the
121 symbol is undefined and becomes defined, this field will
122 automatically be non-NULL since the symbol will have been on the
123 undefined symbol list. */
124 struct bfd_link_hash_entry
*next
;
125 bfd
*abfd
; /* BFD symbol was found in. */
127 /* bfd_link_hash_defined, bfd_link_hash_defweak. */
130 struct bfd_link_hash_entry
*next
;
131 asection
*section
; /* Symbol section. */
132 bfd_vma value
; /* Symbol value. */
134 /* bfd_link_hash_indirect, bfd_link_hash_warning. */
137 struct bfd_link_hash_entry
*next
;
138 struct bfd_link_hash_entry
*link
; /* Real symbol. */
139 const char *warning
; /* Warning (bfd_link_hash_warning only). */
141 /* bfd_link_hash_common. */
144 struct bfd_link_hash_entry
*next
;
145 /* The linker needs to know three things about common
146 symbols: the size, the alignment, and the section in
147 which the symbol should be placed. We store the size
148 here, and we allocate a small structure to hold the
149 section and the alignment. The alignment is stored as a
150 power of two. We don't store all the information
151 directly because we don't want to increase the size of
152 the union; this structure is a major space user in the
154 struct bfd_link_hash_common_entry
*p
;
155 bfd_size_type size
; /* Common symbol size. */
160 /* This is the link hash table. It is a derived class of
163 struct bfd_link_hash_table
165 /* The hash table itself. */
166 struct bfd_hash_table table
;
167 /* A linked list of undefined and common symbols, linked through the
168 next field in the bfd_link_hash_entry structure. */
169 struct bfd_link_hash_entry
*undefs
;
170 /* Entries are added to the tail of the undefs list. */
171 struct bfd_link_hash_entry
*undefs_tail
;
172 /* The type of the link hash table. */
173 enum bfd_link_hash_table_type type
;
176 /* Look up an entry in a link hash table. If FOLLOW is TRUE, this
177 follows bfd_link_hash_indirect and bfd_link_hash_warning links to
179 extern struct bfd_link_hash_entry
*bfd_link_hash_lookup
180 (struct bfd_link_hash_table
*, const char *, bfd_boolean create
,
181 bfd_boolean copy
, bfd_boolean follow
);
183 /* Look up an entry in the main linker hash table if the symbol might
184 be wrapped. This should only be used for references to an
185 undefined symbol, not for definitions of a symbol. */
187 extern struct bfd_link_hash_entry
*bfd_wrapped_link_hash_lookup
188 (bfd
*, struct bfd_link_info
*, const char *, bfd_boolean
,
189 bfd_boolean
, bfd_boolean
);
191 /* Traverse a link hash table. */
192 extern void bfd_link_hash_traverse
193 (struct bfd_link_hash_table
*,
194 bfd_boolean (*) (struct bfd_link_hash_entry
*, void *),
197 /* Add an entry to the undefs list. */
198 extern void bfd_link_add_undef
199 (struct bfd_link_hash_table
*, struct bfd_link_hash_entry
*);
201 /* Remove symbols from the undefs list that don't belong there. */
202 extern void bfd_link_repair_undef_list
203 (struct bfd_link_hash_table
*table
);
205 /* Read symbols and cache symbol pointer array in outsymbols. */
206 extern bfd_boolean
bfd_generic_link_read_symbols (bfd
*);
210 struct bfd_sym_chain
*next
;
214 /* How to handle unresolved symbols.
215 There are four possibilities which are enumerated below: */
218 /* This is the initial value when then link_info structure is created.
219 It allows the various stages of the linker to determine whether they
220 allowed to set the value. */
227 typedef enum {with_flags
, without_flags
} flag_type
;
229 /* A section flag list. */
230 struct flag_info_list
235 struct flag_info_list
*next
;
238 /* Section flag info. */
241 flagword only_with_flags
;
242 flagword not_with_flags
;
243 struct flag_info_list
*flag_list
;
244 bfd_boolean flags_initialized
;
247 struct bfd_elf_dynamic_list
;
248 struct bfd_elf_version_tree
;
250 /* This structure holds all the information needed to communicate
251 between BFD and the linker when doing a link. */
255 /* TRUE if BFD should generate a shared object (or a pie). */
256 unsigned int shared
: 1;
258 /* TRUE if generating an executable, position independent or not. */
259 unsigned int executable
: 1;
261 /* TRUE if generating a position independent executable. */
264 /* TRUE if BFD should generate a relocatable object file. */
265 unsigned int relocatable
: 1;
267 /* TRUE if BFD should pre-bind symbols in a shared object. */
268 unsigned int symbolic
: 1;
270 /* TRUE if executable should not contain copy relocs.
271 Setting this true may result in a non-sharable text segment. */
272 unsigned int nocopyreloc
: 1;
274 /* TRUE if BFD should export all symbols in the dynamic symbol table
275 of an executable, rather than only those used. */
276 unsigned int export_dynamic
: 1;
278 /* TRUE if a default symbol version should be created and used for
280 unsigned int create_default_symver
: 1;
282 /* TRUE if unreferenced sections should be removed. */
283 unsigned int gc_sections
: 1;
285 /* TRUE if every symbol should be reported back via the notice
287 unsigned int notice_all
: 1;
289 /* TRUE if we are loading LTO outputs. */
290 unsigned int loading_lto_outputs
: 1;
292 /* TRUE if global symbols in discarded sections should be stripped. */
293 unsigned int strip_discarded
: 1;
295 /* TRUE if all data symbols should be dynamic. */
296 unsigned int dynamic_data
: 1;
298 /* Which symbols to strip. */
299 ENUM_BITFIELD (bfd_link_strip
) strip
: 2;
301 /* Which local symbols to discard. */
302 ENUM_BITFIELD (bfd_link_discard
) discard
: 2;
304 /* Criteria for skipping symbols when determining
305 whether to include an object from an archive. */
306 ENUM_BITFIELD (bfd_link_common_skip_ar_symbols
) common_skip_ar_symbols
: 2;
308 /* What to do with unresolved symbols in an object file.
309 When producing executables the default is GENERATE_ERROR.
310 When producing shared libraries the default is IGNORE. The
311 assumption with shared libraries is that the reference will be
312 resolved at load/execution time. */
313 ENUM_BITFIELD (report_method
) unresolved_syms_in_objects
: 2;
315 /* What to do with unresolved symbols in a shared library.
316 The same defaults apply. */
317 ENUM_BITFIELD (report_method
) unresolved_syms_in_shared_libs
: 2;
319 /* TRUE if shared objects should be linked directly, not shared. */
320 unsigned int static_link
: 1;
322 /* TRUE if symbols should be retained in memory, FALSE if they
323 should be freed and reread. */
324 unsigned int keep_memory
: 1;
326 /* TRUE if BFD should generate relocation information in the final
328 unsigned int emitrelocations
: 1;
330 /* TRUE if PT_GNU_RELRO segment should be created. */
331 unsigned int relro
: 1;
333 /* TRUE if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment
334 should be created. */
335 unsigned int eh_frame_hdr
: 1;
337 /* TRUE if we should warn when adding a DT_TEXTREL to a shared object. */
338 unsigned int warn_shared_textrel
: 1;
340 /* TRUE if we should error when adding a DT_TEXTREL. */
341 unsigned int error_textrel
: 1;
343 /* TRUE if .hash section should be created. */
344 unsigned int emit_hash
: 1;
346 /* TRUE if .gnu.hash section should be created. */
347 unsigned int emit_gnu_hash
: 1;
349 /* If TRUE reduce memory overheads, at the expense of speed. This will
350 cause map file generation to use an O(N^2) algorithm and disable
351 caching ELF symbol buffer. */
352 unsigned int reduce_memory_overheads
: 1;
354 /* TRUE if the output file should be in a traditional format. This
355 is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag
356 on the output file, but may be checked when reading the input
358 unsigned int traditional_format
: 1;
360 /* TRUE if non-PLT relocs should be merged into one reloc section
361 and sorted so that relocs against the same symbol come together. */
362 unsigned int combreloc
: 1;
364 /* TRUE if a default symbol version should be created and used for
366 unsigned int default_imported_symver
: 1;
368 /* TRUE if the new ELF dynamic tags are enabled. */
369 unsigned int new_dtags
: 1;
371 /* FALSE if .eh_frame unwind info should be generated for PLT and other
372 linker created sections, TRUE if it should be omitted. */
373 unsigned int no_ld_generated_unwind_info
: 1;
375 /* TRUE if BFD should generate a "task linked" object file,
376 similar to relocatable but also with globals converted to
378 unsigned int task_link
: 1;
380 /* TRUE if ok to have multiple definition. */
381 unsigned int allow_multiple_definition
: 1;
383 /* TRUE if ok to have version with no definition. */
384 unsigned int allow_undefined_version
: 1;
386 /* TRUE if some symbols have to be dynamic, controlled by
387 --dynamic-list command line options. */
388 unsigned int dynamic
: 1;
390 /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X
392 unsigned int execstack
: 1;
394 /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W
396 unsigned int noexecstack
: 1;
398 /* TRUE if we want to produced optimized output files. This might
399 need much more time and therefore must be explicitly selected. */
400 unsigned int optimize
: 1;
402 /* TRUE if user should be informed of removed unreferenced sections. */
403 unsigned int print_gc_sections
: 1;
405 /* TRUE if we should warn alternate ELF machine code. */
406 unsigned int warn_alternate_em
: 1;
408 /* TRUE if the linker script contained an explicit PHDRS command. */
409 unsigned int user_phdrs
: 1;
411 /* Char that may appear as the first char of a symbol, but should be
412 skipped (like symbol_leading_char) when looking up symbols in
413 wrap_hash. Used by PowerPC Linux for 'dot' symbols. */
416 /* Separator between archive and filename in linker script filespecs. */
419 /* Default stack size. Zero means default (often zero itself), -1
420 means explicitly zero-sized. */
421 bfd_signed_vma stacksize
;
423 /* Function callbacks. */
424 const struct bfd_link_callbacks
*callbacks
;
426 /* Hash table handled by BFD. */
427 struct bfd_link_hash_table
*hash
;
429 /* Hash table of symbols to keep. This is NULL unless strip is
431 struct bfd_hash_table
*keep_hash
;
433 /* Hash table of symbols to report back via the notice callback. If
434 this is NULL, and notice_all is FALSE, then no symbols are
436 struct bfd_hash_table
*notice_hash
;
438 /* Hash table of symbols which are being wrapped (the --wrap linker
439 option). If this is NULL, no symbols are being wrapped. */
440 struct bfd_hash_table
*wrap_hash
;
442 /* Hash table of symbols which may be left unresolved during
443 a link. If this is NULL, no symbols can be left unresolved. */
444 struct bfd_hash_table
*ignore_hash
;
446 /* The output BFD. */
449 /* The list of input BFD's involved in the link. These are chained
450 together via the link_next field. */
452 bfd
**input_bfds_tail
;
454 /* Non-NULL if .note.gnu.build-id section should be created. */
455 char *emit_note_gnu_build_id
;
457 /* If a symbol should be created for each input BFD, this is section
458 where those symbols should be placed. It must be a section in
459 the output BFD. It may be NULL, in which case no such symbols
460 will be created. This is to support CREATE_OBJECT_SYMBOLS in the
461 linker command language. */
462 asection
*create_object_symbols_section
;
464 /* List of global symbol names that are starting points for marking
465 sections against garbage collection. */
466 struct bfd_sym_chain
*gc_sym_list
;
468 /* If a base output file is wanted, then this points to it */
471 /* The function to call when the executable or shared object is
473 const char *init_function
;
475 /* The function to call when the executable or shared object is
477 const char *fini_function
;
479 /* Number of relaxation passes. Usually only one relaxation pass
480 is needed. But a backend can have as many relaxation passes as
481 necessary. During bfd_relax_section call, it is set to the
482 current pass, starting from 0. */
485 /* Number of relaxation trips. This number is incremented every
486 time the relaxation pass is restarted due to a previous
487 relaxation returning true in *AGAIN. */
490 /* Non-zero if auto-import thunks for DATA items in pei386 DLLs
491 should be generated/linked against. Set to 1 if this feature
492 is explicitly requested by the user, -1 if enabled by default. */
493 int pei386_auto_import
;
495 /* Non-zero if runtime relocs for DATA items with non-zero addends
496 in pei386 DLLs should be generated. Set to 1 if this feature
497 is explicitly requested by the user, -1 if enabled by default. */
498 int pei386_runtime_pseudo_reloc
;
500 /* How many spare .dynamic DT_NULL entries should be added? */
501 unsigned int spare_dynamic_tags
;
503 /* May be used to set DT_FLAGS for ELF. */
506 /* May be used to set DT_FLAGS_1 for ELF. */
509 /* Start and end of RELRO region. */
510 bfd_vma relro_start
, relro_end
;
512 /* List of symbols should be dynamic. */
513 struct bfd_elf_dynamic_list
*dynamic_list
;
515 /* The version information. */
516 struct bfd_elf_version_tree
*version_info
;
519 /* This structures holds a set of callback functions. These are called
520 by the BFD linker routines. Except for the info functions, the first
521 argument to each callback function is the bfd_link_info structure
522 being used and each function returns a boolean value. If the
523 function returns FALSE, then the BFD function which called it should
524 return with a failure indication. */
526 struct bfd_link_callbacks
528 /* A function which is called when an object is added from an
529 archive. ABFD is the archive element being added. NAME is the
530 name of the symbol which caused the archive element to be pulled
531 in. This function may set *SUBSBFD to point to an alternative
532 BFD from which symbols should in fact be added in place of the
533 original BFD's symbols. */
534 bfd_boolean (*add_archive_element
)
535 (struct bfd_link_info
*, bfd
*abfd
, const char *name
, bfd
**subsbfd
);
536 /* A function which is called when a symbol is found with multiple
537 definitions. H is the symbol which is defined multiple times.
538 NBFD is the new BFD, NSEC is the new section, and NVAL is the new
539 value. NSEC may be bfd_com_section or bfd_ind_section. */
540 bfd_boolean (*multiple_definition
)
541 (struct bfd_link_info
*, struct bfd_link_hash_entry
*h
,
542 bfd
*nbfd
, asection
*nsec
, bfd_vma nval
);
543 /* A function which is called when a common symbol is defined
544 multiple times. H is the symbol appearing multiple times.
545 NBFD is the BFD of the new symbol. NTYPE is the type of the new
546 symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or
547 bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE
548 is the size of the new symbol. */
549 bfd_boolean (*multiple_common
)
550 (struct bfd_link_info
*, struct bfd_link_hash_entry
*h
,
551 bfd
*nbfd
, enum bfd_link_hash_type ntype
, bfd_vma nsize
);
552 /* A function which is called to add a symbol to a set. ENTRY is
553 the link hash table entry for the set itself (e.g.,
554 __CTOR_LIST__). RELOC is the relocation to use for an entry in
555 the set when generating a relocatable file, and is also used to
556 get the size of the entry when generating an executable file.
557 ABFD, SEC and VALUE identify the value to add to the set. */
558 bfd_boolean (*add_to_set
)
559 (struct bfd_link_info
*, struct bfd_link_hash_entry
*entry
,
560 bfd_reloc_code_real_type reloc
, bfd
*abfd
, asection
*sec
, bfd_vma value
);
561 /* A function which is called when the name of a g++ constructor or
562 destructor is found. This is only called by some object file
563 formats. CONSTRUCTOR is TRUE for a constructor, FALSE for a
564 destructor. This will use BFD_RELOC_CTOR when generating a
565 relocatable file. NAME is the name of the symbol found. ABFD,
566 SECTION and VALUE are the value of the symbol. */
567 bfd_boolean (*constructor
)
568 (struct bfd_link_info
*, bfd_boolean constructor
, const char *name
,
569 bfd
*abfd
, asection
*sec
, bfd_vma value
);
570 /* A function which is called to issue a linker warning. For
571 example, this is called when there is a reference to a warning
572 symbol. WARNING is the warning to be issued. SYMBOL is the name
573 of the symbol which triggered the warning; it may be NULL if
574 there is none. ABFD, SECTION and ADDRESS identify the location
575 which trigerred the warning; either ABFD or SECTION or both may
576 be NULL if the location is not known. */
577 bfd_boolean (*warning
)
578 (struct bfd_link_info
*, const char *warning
, const char *symbol
,
579 bfd
*abfd
, asection
*section
, bfd_vma address
);
580 /* A function which is called when a relocation is attempted against
581 an undefined symbol. NAME is the symbol which is undefined.
582 ABFD, SECTION and ADDRESS identify the location from which the
583 reference is made. IS_FATAL indicates whether an undefined symbol is
584 a fatal error or not. In some cases SECTION may be NULL. */
585 bfd_boolean (*undefined_symbol
)
586 (struct bfd_link_info
*, const char *name
, bfd
*abfd
,
587 asection
*section
, bfd_vma address
, bfd_boolean is_fatal
);
588 /* A function which is called when a reloc overflow occurs. ENTRY is
589 the link hash table entry for the symbol the reloc is against.
590 NAME is the name of the local symbol or section the reloc is
591 against, RELOC_NAME is the name of the relocation, and ADDEND is
592 any addend that is used. ABFD, SECTION and ADDRESS identify the
593 location at which the overflow occurs; if this is the result of a
594 bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
595 ABFD will be NULL. */
596 bfd_boolean (*reloc_overflow
)
597 (struct bfd_link_info
*, struct bfd_link_hash_entry
*entry
,
598 const char *name
, const char *reloc_name
, bfd_vma addend
,
599 bfd
*abfd
, asection
*section
, bfd_vma address
);
600 /* A function which is called when a dangerous reloc is performed.
601 MESSAGE is an appropriate message.
602 ABFD, SECTION and ADDRESS identify the location at which the
603 problem occurred; if this is the result of a
604 bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
605 ABFD will be NULL. */
606 bfd_boolean (*reloc_dangerous
)
607 (struct bfd_link_info
*, const char *message
,
608 bfd
*abfd
, asection
*section
, bfd_vma address
);
609 /* A function which is called when a reloc is found to be attached
610 to a symbol which is not being written out. NAME is the name of
611 the symbol. ABFD, SECTION and ADDRESS identify the location of
612 the reloc; if this is the result of a
613 bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
614 ABFD will be NULL. */
615 bfd_boolean (*unattached_reloc
)
616 (struct bfd_link_info
*, const char *name
,
617 bfd
*abfd
, asection
*section
, bfd_vma address
);
618 /* A function which is called when a symbol in notice_hash is
619 defined or referenced. H is the symbol. ABFD, SECTION and
620 ADDRESS are the (new) value of the symbol. If SECTION is
621 bfd_und_section, this is a reference. FLAGS are the symbol
622 BSF_* flags. STRING is the name of the symbol to indirect to if
623 the sym is indirect, or the warning string if a warning sym. */
624 bfd_boolean (*notice
)
625 (struct bfd_link_info
*, struct bfd_link_hash_entry
*h
,
626 bfd
*abfd
, asection
*section
, bfd_vma address
, flagword flags
,
628 /* Error or warning link info message. */
630 (const char *fmt
, ...);
631 /* General link info message. */
633 (const char *fmt
, ...);
634 /* Message to be printed in linker map file. */
636 (const char *fmt
, ...);
637 /* This callback provides a chance for users of the BFD library to
638 override its decision about whether to place two adjacent sections
639 into the same segment. */
640 bfd_boolean (*override_segment_assignment
)
641 (struct bfd_link_info
*, bfd
* abfd
,
642 asection
* current_section
, asection
* previous_section
,
643 bfd_boolean new_segment
);
646 /* The linker builds link_order structures which tell the code how to
647 include input data in the output file. */
649 /* These are the types of link_order structures. */
651 enum bfd_link_order_type
653 bfd_undefined_link_order
, /* Undefined. */
654 bfd_indirect_link_order
, /* Built from a section. */
655 bfd_data_link_order
, /* Set to explicit data. */
656 bfd_section_reloc_link_order
, /* Relocate against a section. */
657 bfd_symbol_reloc_link_order
/* Relocate against a symbol. */
660 /* This is the link_order structure itself. These form a chain
661 attached to the output section whose contents they are describing. */
663 struct bfd_link_order
665 /* Next link_order in chain. */
666 struct bfd_link_order
*next
;
667 /* Type of link_order. */
668 enum bfd_link_order_type type
;
669 /* Offset within output section. */
671 /* Size within output section. */
673 /* Type specific information. */
678 /* Section to include. If this is used, then
679 section->output_section must be the section the
680 link_order is attached to, section->output_offset must
681 equal the link_order offset field, and section->size
682 must equal the link_order size field. Maybe these
683 restrictions should be relaxed someday. */
688 /* Size of contents, or zero when contents should be filled by
689 the architecture-dependent fill function.
690 A non-zero value allows filling of the output section
691 with an arbitrary repeated pattern. */
693 /* Data to put into file. */
698 /* Description of reloc to generate. Used for
699 bfd_section_reloc_link_order and
700 bfd_symbol_reloc_link_order. */
701 struct bfd_link_order_reloc
*p
;
706 /* A linker order of type bfd_section_reloc_link_order or
707 bfd_symbol_reloc_link_order means to create a reloc against a
708 section or symbol, respectively. This is used to implement -Ur to
709 generate relocs for the constructor tables. The
710 bfd_link_order_reloc structure describes the reloc that BFD should
711 create. It is similar to a arelent, but I didn't use arelent
712 because the linker does not know anything about most symbols, and
713 any asymbol structure it creates will be partially meaningless.
714 This information could logically be in the bfd_link_order struct,
715 but I didn't want to waste the space since these types of relocs
716 are relatively rare. */
718 struct bfd_link_order_reloc
721 bfd_reloc_code_real_type reloc
;
725 /* For type bfd_section_reloc_link_order, this is the section
726 the reloc should be against. This must be a section in the
727 output BFD, not any of the input BFDs. */
729 /* For type bfd_symbol_reloc_link_order, this is the name of the
730 symbol the reloc should be against. */
734 /* Addend to use. The object file should contain zero. The BFD
735 backend is responsible for filling in the contents of the object
736 file correctly. For some object file formats (e.g., COFF) the
737 addend must be stored into in the object file, and for some
738 (e.g., SPARC a.out) it is kept in the reloc. */
742 /* Allocate a new link_order for a section. */
743 extern struct bfd_link_order
*bfd_new_link_order (bfd
*, asection
*);
745 /* These structures are used to describe version information for the
746 ELF linker. These structures could be manipulated entirely inside
747 BFD, but it would be a pain. Instead, the regular linker sets up
748 these structures, and then passes them into BFD. */
750 /* Glob pattern for a version. */
752 struct bfd_elf_version_expr
754 /* Next glob pattern for this version. */
755 struct bfd_elf_version_expr
*next
;
758 /* Set if pattern is not a glob. */
759 unsigned int literal
: 1;
760 /* Defined by ".symver". */
761 unsigned int symver
: 1;
762 /* Defined by version script. */
763 unsigned int script
: 1;
765 #define BFD_ELF_VERSION_C_TYPE 1
766 #define BFD_ELF_VERSION_CXX_TYPE 2
767 #define BFD_ELF_VERSION_JAVA_TYPE 4
768 unsigned int mask
: 3;
771 struct bfd_elf_version_expr_head
773 /* List of all patterns, both wildcards and non-wildcards. */
774 struct bfd_elf_version_expr
*list
;
775 /* Hash table for non-wildcards. */
777 /* Remaining patterns. */
778 struct bfd_elf_version_expr
*remaining
;
779 /* What kind of pattern types are present in list (bitmask). */
783 /* Version dependencies. */
785 struct bfd_elf_version_deps
787 /* Next dependency for this version. */
788 struct bfd_elf_version_deps
*next
;
789 /* The version which this version depends upon. */
790 struct bfd_elf_version_tree
*version_needed
;
793 /* A node in the version tree. */
795 struct bfd_elf_version_tree
798 struct bfd_elf_version_tree
*next
;
799 /* Name of this version. */
801 /* Version number. */
803 /* Regular expressions for global symbols in this version. */
804 struct bfd_elf_version_expr_head globals
;
805 /* Regular expressions for local symbols in this version. */
806 struct bfd_elf_version_expr_head locals
;
807 /* List of versions which this version depends upon. */
808 struct bfd_elf_version_deps
*deps
;
809 /* Index of the version name. This is used within BFD. */
810 unsigned int name_indx
;
811 /* Whether this version tree was used. This is used within BFD. */
814 struct bfd_elf_version_expr
*(*match
)
815 (struct bfd_elf_version_expr_head
*head
,
816 struct bfd_elf_version_expr
*prev
, const char *sym
);
819 struct bfd_elf_dynamic_list
821 struct bfd_elf_version_expr_head head
;
822 struct bfd_elf_version_expr
*(*match
)
823 (struct bfd_elf_version_expr_head
*head
,
824 struct bfd_elf_version_expr
*prev
, const char *sym
);