1 /* ldlang.h - linker command language support
2 Copyright (C) 1991-2015 Free Software Foundation, Inc.
4 This file is part of the GNU Binutils.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
24 #define DEFAULT_MEMORY_REGION "*default*"
28 lang_input_file_is_l_enum
,
29 lang_input_file_is_symbols_only_enum
,
30 lang_input_file_is_marker_enum
,
31 lang_input_file_is_fake_enum
,
32 lang_input_file_is_search_file_enum
,
33 lang_input_file_is_file_enum
34 } lang_input_file_enum_type
;
39 unsigned char data
[1];
42 typedef struct statement_list
44 union lang_statement_union
* head
;
45 union lang_statement_union
** tail
;
46 } lang_statement_list_type
;
48 typedef struct memory_region_name_struct
51 struct memory_region_name_struct
* next
;
52 } lang_memory_region_name
;
54 typedef struct memory_region_struct
56 lang_memory_region_name name_list
;
57 struct memory_region_struct
*next
;
58 union etree_union
*origin_exp
;
61 union etree_union
*length_exp
;
63 union lang_statement_union
*last_os
;
66 bfd_boolean had_full_message
;
67 } lang_memory_region_type
;
71 lang_output_section_statement_enum
,
72 lang_assignment_statement_enum
,
73 lang_input_statement_enum
,
74 lang_address_statement_enum
,
75 lang_wild_statement_enum
,
76 lang_input_section_enum
,
77 lang_object_symbols_statement_enum
,
78 lang_fill_statement_enum
,
79 lang_data_statement_enum
,
80 lang_reloc_statement_enum
,
81 lang_target_statement_enum
,
82 lang_output_statement_enum
,
83 lang_padding_statement_enum
,
84 lang_group_statement_enum
,
85 lang_insert_statement_enum
,
86 lang_constructors_statement_enum
89 typedef struct lang_statement_header_struct
91 union lang_statement_union
*next
;
92 enum statement_enum type
;
93 } lang_statement_header_type
;
97 lang_statement_header_type header
;
98 union etree_union
*exp
;
99 } lang_assignment_statement_type
;
101 typedef struct lang_target_statement_struct
103 lang_statement_header_type header
;
105 } lang_target_statement_type
;
107 typedef struct lang_output_statement_struct
109 lang_statement_header_type header
;
111 } lang_output_statement_type
;
113 /* Section types specified in a linker script. */
123 /* This structure holds a list of program headers describing
124 segments in which this section should be placed. */
126 typedef struct lang_output_section_phdr_list
128 struct lang_output_section_phdr_list
*next
;
131 } lang_output_section_phdr_list
;
133 typedef struct lang_output_section_statement_struct
135 lang_statement_header_type header
;
136 lang_statement_list_type children
;
137 struct lang_output_section_statement_struct
*next
;
138 struct lang_output_section_statement_struct
*prev
;
140 asection
*bfd_section
;
141 lang_memory_region_type
*region
;
142 lang_memory_region_type
*lma_region
;
144 union etree_union
*addr_tree
;
145 union etree_union
*load_base
;
147 /* If non-null, an expression to evaluate after setting the section's
148 size. The expression is evaluated inside REGION (above) with '.'
149 set to the end of the section. Used in the last overlay section
150 to move '.' past all the overlaid sections. */
151 union etree_union
*update_dot_tree
;
153 lang_output_section_phdr_list
*phdrs
;
155 unsigned int block_value
;
156 int subsection_alignment
; /* Alignment of components. */
157 int section_alignment
; /* Alignment of start of section. */
160 enum section_type sectype
;
161 unsigned int processed_vma
: 1;
162 unsigned int processed_lma
: 1;
163 unsigned int all_input_readonly
: 1;
164 /* If this section should be ignored. */
165 unsigned int ignored
: 1;
166 /* If this section should update "dot". Prevents section being ignored. */
167 unsigned int update_dot
: 1;
168 /* If this section is after assignment to _end. */
169 unsigned int after_end
: 1;
170 /* If this section uses the alignment of its input sections. */
171 unsigned int align_lma_with_input
: 1;
172 } lang_output_section_statement_type
;
176 lang_statement_header_type header
;
177 } lang_common_statement_type
;
181 lang_statement_header_type header
;
182 } lang_object_symbols_statement_type
;
186 lang_statement_header_type header
;
189 asection
*output_section
;
190 } lang_fill_statement_type
;
194 lang_statement_header_type header
;
196 union etree_union
*exp
;
198 asection
*output_section
;
199 bfd_vma output_offset
;
200 } lang_data_statement_type
;
202 /* Generate a reloc in the output file. */
206 lang_statement_header_type header
;
208 /* Reloc to generate. */
209 bfd_reloc_code_real_type reloc
;
211 /* Reloc howto structure. */
212 reloc_howto_type
*howto
;
214 /* Section to generate reloc against.
215 Exactly one of section and name must be NULL. */
218 /* Name of symbol to generate reloc against.
219 Exactly one of section and name must be NULL. */
222 /* Expression for addend. */
223 union etree_union
*addend_exp
;
225 /* Resolved addend. */
226 bfd_vma addend_value
;
228 /* Output section where reloc should be performed. */
229 asection
*output_section
;
231 /* Offset within output section. */
232 bfd_vma output_offset
;
233 } lang_reloc_statement_type
;
235 struct lang_input_statement_flags
237 /* 1 means this file was specified in a -l option. */
238 unsigned int maybe_archive
: 1;
240 /* 1 means this file was specified in a -l:namespec option. */
241 unsigned int full_name_provided
: 1;
243 /* 1 means search a set of directories for this file. */
244 unsigned int search_dirs
: 1;
246 /* 1 means this was found when processing a script in the sysroot. */
247 unsigned int sysrooted
: 1;
249 /* 1 means this is base file of incremental load.
250 Do not load this file's text or data.
251 Also default text_start to after this file's bss. */
252 unsigned int just_syms
: 1;
254 /* Whether to search for this entry as a dynamic archive. */
255 unsigned int dynamic
: 1;
257 /* Set if a DT_NEEDED tag should be added not just for the dynamic library
258 explicitly given by this entry but also for any dynamic libraries in
259 this entry's needed list. */
260 unsigned int add_DT_NEEDED_for_dynamic
: 1;
262 /* Set if this entry should cause a DT_NEEDED tag only when some
263 regular file references its symbols (ie. --as-needed is in effect). */
264 unsigned int add_DT_NEEDED_for_regular
: 1;
266 /* Whether to include the entire contents of an archive. */
267 unsigned int whole_archive
: 1;
269 /* Set when bfd opening is successful. */
270 unsigned int loaded
: 1;
272 unsigned int real
: 1;
274 /* Set if the file does not exist. */
275 unsigned int missing_file
: 1;
277 /* Set if reloading an archive or --as-needed lib. */
278 unsigned int reload
: 1;
280 #ifdef ENABLE_PLUGINS
281 /* Set if the file was claimed by a plugin. */
282 unsigned int claimed
: 1;
284 /* Set if the file was claimed from an archive. */
285 unsigned int claim_archive
: 1;
286 #endif /* ENABLE_PLUGINS */
288 /* Head of list of pushed flags. */
289 struct lang_input_statement_flags
*pushed
;
292 typedef struct lang_input_statement_struct
294 lang_statement_header_type header
;
295 /* Name of this file. */
296 const char *filename
;
297 /* Name to use for the symbol giving address of text start.
298 Usually the same as filename, but for a file spec'd with
299 -l this is the -l switch itself rather than the filename. */
300 const char *local_sym_name
;
304 struct flag_info
*section_flag_list
;
306 /* Point to the next file - whatever it is, wanders up and down
308 union lang_statement_union
*next
;
310 /* Point to the next file, but skips archive contents. */
311 union lang_statement_union
*next_real_file
;
315 struct lang_input_statement_flags flags
;
316 } lang_input_statement_type
;
320 lang_statement_header_type header
;
322 } lang_input_section_type
;
324 struct map_symbol_def
{
325 struct bfd_link_hash_entry
*entry
;
326 struct map_symbol_def
*next
;
329 /* For input sections, when writing a map file: head / tail of a linked
330 list of hash table entries for symbols defined in this section. */
331 typedef struct input_section_userdata_struct
333 struct map_symbol_def
*map_symbol_def_head
;
334 struct map_symbol_def
**map_symbol_def_tail
;
335 unsigned long map_symbol_def_count
;
336 } input_section_userdata_type
;
338 #define get_userdata(x) ((x)->userdata)
341 typedef struct lang_wild_statement_struct lang_wild_statement_type
;
343 typedef void (*callback_t
) (lang_wild_statement_type
*, struct wildcard_list
*,
344 asection
*, struct flag_info
*,
345 lang_input_statement_type
*, void *);
347 typedef void (*walk_wild_section_handler_t
) (lang_wild_statement_type
*,
348 lang_input_statement_type
*,
352 typedef bfd_boolean (*lang_match_sec_type_func
) (bfd
*, const asection
*,
353 bfd
*, const asection
*);
355 /* Binary search tree structure to efficiently sort sections by
357 typedef struct lang_section_bst
360 struct lang_section_bst
*left
;
361 struct lang_section_bst
*right
;
362 } lang_section_bst_type
;
364 struct lang_wild_statement_struct
366 lang_statement_header_type header
;
367 const char *filename
;
368 bfd_boolean filenames_sorted
;
369 struct wildcard_list
*section_list
;
370 bfd_boolean keep_sections
;
371 lang_statement_list_type children
;
373 walk_wild_section_handler_t walk_wild_section_handler
;
374 struct wildcard_list
*handler_data
[4];
375 lang_section_bst_type
*tree
;
376 struct flag_info
*section_flag_list
;
379 typedef struct lang_address_statement_struct
381 lang_statement_header_type header
;
382 const char *section_name
;
383 union etree_union
*address
;
384 const segment_type
*segment
;
385 } lang_address_statement_type
;
389 lang_statement_header_type header
;
390 bfd_vma output_offset
;
392 asection
*output_section
;
394 } lang_padding_statement_type
;
396 /* A group statement collects a set of libraries together. The
397 libraries are searched multiple times, until no new undefined
398 symbols are found. The effect is to search a group of libraries as
399 though they were a single library. */
403 lang_statement_header_type header
;
404 lang_statement_list_type children
;
405 } lang_group_statement_type
;
409 lang_statement_header_type header
;
411 bfd_boolean is_before
;
412 } lang_insert_statement_type
;
414 typedef union lang_statement_union
416 lang_statement_header_type header
;
417 lang_wild_statement_type wild_statement
;
418 lang_data_statement_type data_statement
;
419 lang_reloc_statement_type reloc_statement
;
420 lang_address_statement_type address_statement
;
421 lang_output_section_statement_type output_section_statement
;
422 lang_assignment_statement_type assignment_statement
;
423 lang_input_statement_type input_statement
;
424 lang_target_statement_type target_statement
;
425 lang_output_statement_type output_statement
;
426 lang_input_section_type input_section
;
427 lang_common_statement_type common_statement
;
428 lang_object_symbols_statement_type object_symbols_statement
;
429 lang_fill_statement_type fill_statement
;
430 lang_padding_statement_type padding_statement
;
431 lang_group_statement_type group_statement
;
432 lang_insert_statement_type insert_statement
;
433 } lang_statement_union_type
;
435 /* This structure holds information about a program header, from the
436 PHDRS command in the linker script. */
440 struct lang_phdr
*next
;
449 /* This structure is used to hold a list of sections which may not
450 cross reference each other. */
452 typedef struct lang_nocrossref
454 struct lang_nocrossref
*next
;
456 } lang_nocrossref_type
;
458 /* The list of nocrossref lists. */
460 struct lang_nocrossrefs
462 struct lang_nocrossrefs
*next
;
463 lang_nocrossref_type
*list
;
466 /* This structure is used to hold a list of input section names which
467 will not match an output section in the linker script. */
469 struct unique_sections
471 struct unique_sections
*next
;
475 /* Used by place_orphan to keep track of orphan sections and statements. */
481 lang_output_section_statement_type
*os
;
483 lang_statement_union_type
**stmt
;
484 lang_output_section_statement_type
**os_tail
;
487 struct asneeded_minfo
489 struct asneeded_minfo
*next
;
495 extern struct lang_phdr
*lang_phdr_list
;
496 extern struct lang_nocrossrefs
*nocrossref_list
;
497 extern const char *output_target
;
498 extern lang_output_section_statement_type
*abs_output_section
;
499 extern lang_statement_list_type lang_output_section_statement
;
500 extern struct lang_input_statement_flags input_flags
;
501 extern bfd_boolean lang_has_input_file
;
502 extern lang_statement_list_type
*stat_ptr
;
503 extern bfd_boolean delete_output_file_on_failure
;
505 extern struct bfd_sym_chain entry_symbol
;
506 extern const char *entry_section
;
507 extern bfd_boolean entry_from_cmdline
;
508 extern lang_statement_list_type file_chain
;
509 extern lang_statement_list_type input_file_chain
;
511 extern int lang_statement_iteration
;
512 extern struct asneeded_minfo
**asneeded_list_tail
;
514 extern void (*output_bfd_hash_table_free_fn
) (struct bfd_link_hash_table
*);
516 extern void lang_init
518 extern void lang_finish
520 extern lang_memory_region_type
* lang_memory_region_lookup
521 (const char * const, bfd_boolean
);
522 extern void lang_memory_region_alias
523 (const char *, const char *);
526 extern void lang_set_flags
527 (lang_memory_region_type
*, const char *, int);
528 extern void lang_add_output
529 (const char *, int from_script
);
530 extern lang_output_section_statement_type
*lang_enter_output_section_statement
531 (const char *, etree_type
*, enum section_type
, etree_type
*, etree_type
*,
532 etree_type
*, int, int);
533 extern void lang_final
535 extern void lang_relax_sections
537 extern void lang_process
539 extern void lang_section_start
540 (const char *, union etree_union
*, const segment_type
*);
541 extern void lang_add_entry
542 (const char *, bfd_boolean
);
543 extern void lang_default_entry
545 extern void lang_add_target
547 extern void lang_add_wild
548 (struct wildcard_spec
*, struct wildcard_list
*, bfd_boolean
);
549 extern void lang_add_map
551 extern void lang_add_fill
553 extern lang_assignment_statement_type
*lang_add_assignment
554 (union etree_union
*);
555 extern void lang_add_attribute
556 (enum statement_enum
);
557 extern void lang_startup
559 extern void lang_float
561 extern void lang_leave_output_section_statement
562 (fill_type
*, const char *, lang_output_section_phdr_list
*,
564 extern void lang_statement_append
565 (lang_statement_list_type
*, lang_statement_union_type
*,
566 lang_statement_union_type
**);
567 extern void lang_for_each_input_file
568 (void (*dothis
) (lang_input_statement_type
*));
569 extern void lang_for_each_file
570 (void (*dothis
) (lang_input_statement_type
*));
571 extern void lang_reset_memory_regions
573 extern void lang_do_assignments
575 extern asection
*section_for_dot
578 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \
579 lang_input_statement_type *statement; \
580 for (statement = (lang_input_statement_type *) file_chain.head; \
581 statement != (lang_input_statement_type *) NULL; \
582 statement = (lang_input_statement_type *) statement->next) \
584 #define lang_output_section_find(NAME) \
585 lang_output_section_statement_lookup (NAME, 0, FALSE)
587 extern void lang_process
589 extern void ldlang_add_file
590 (lang_input_statement_type
*);
591 extern lang_output_section_statement_type
*lang_output_section_find_by_flags
592 (const asection
*, lang_output_section_statement_type
**,
593 lang_match_sec_type_func
);
594 extern lang_output_section_statement_type
*lang_insert_orphan
595 (asection
*, const char *, int, lang_output_section_statement_type
*,
596 struct orphan_save
*, etree_type
*, lang_statement_list_type
*);
597 extern lang_input_statement_type
*lang_add_input_file
598 (const char *, lang_input_file_enum_type
, const char *);
599 extern void lang_add_keepsyms_file
601 extern lang_output_section_statement_type
*lang_output_section_get
603 extern lang_output_section_statement_type
*lang_output_section_statement_lookup
604 (const char *, int, bfd_boolean
);
605 extern lang_output_section_statement_type
*next_matching_output_section_statement
606 (lang_output_section_statement_type
*, int);
607 extern void ldlang_add_undef
608 (const char *const, bfd_boolean
);
609 extern void lang_add_output_format
610 (const char *, const char *, const char *, int);
611 extern void lang_list_init
612 (lang_statement_list_type
*);
613 extern void push_stat_ptr
614 (lang_statement_list_type
*);
615 extern void pop_stat_ptr
617 extern void lang_add_data
618 (int type
, union etree_union
*);
619 extern void lang_add_reloc
620 (bfd_reloc_code_real_type
, reloc_howto_type
*, asection
*, const char *,
621 union etree_union
*);
622 extern void lang_for_each_statement
623 (void (*) (lang_statement_union_type
*));
624 extern void lang_for_each_statement_worker
625 (void (*) (lang_statement_union_type
*), lang_statement_union_type
*);
626 extern void *stat_alloc
628 extern void strip_excluded_output_sections
630 extern void lang_clear_os_map
632 extern void dprint_statement
633 (lang_statement_union_type
*, int);
634 extern void lang_size_sections
635 (bfd_boolean
*, bfd_boolean
);
636 extern void one_lang_size_sections_pass
637 (bfd_boolean
*, bfd_boolean
);
638 extern void lang_add_insert
640 extern void lang_enter_group
642 extern void lang_leave_group
644 extern void lang_add_section
645 (lang_statement_list_type
*, asection
*,
646 struct flag_info
*, lang_output_section_statement_type
*);
647 extern void lang_new_phdr
648 (const char *, etree_type
*, bfd_boolean
, bfd_boolean
, etree_type
*,
650 extern void lang_add_nocrossref
651 (lang_nocrossref_type
*);
652 extern void lang_enter_overlay
653 (etree_type
*, etree_type
*);
654 extern void lang_enter_overlay_section
656 extern void lang_leave_overlay_section
657 (fill_type
*, lang_output_section_phdr_list
*);
658 extern void lang_leave_overlay
659 (etree_type
*, int, fill_type
*, const char *,
660 lang_output_section_phdr_list
*, const char *);
662 extern struct bfd_elf_version_expr
*lang_new_vers_pattern
663 (struct bfd_elf_version_expr
*, const char *, const char *, bfd_boolean
);
664 extern struct bfd_elf_version_tree
*lang_new_vers_node
665 (struct bfd_elf_version_expr
*, struct bfd_elf_version_expr
*);
666 extern struct bfd_elf_version_deps
*lang_add_vers_depend
667 (struct bfd_elf_version_deps
*, const char *);
668 extern void lang_register_vers_node
669 (const char *, struct bfd_elf_version_tree
*, struct bfd_elf_version_deps
*);
670 extern void lang_append_dynamic_list (struct bfd_elf_version_expr
*);
671 extern void lang_append_dynamic_list_cpp_typeinfo (void);
672 extern void lang_append_dynamic_list_cpp_new (void);
673 extern void lang_add_unique
675 extern const char *lang_get_output_target
677 extern void add_excluded_libs (const char *);
678 extern bfd_boolean load_symbols
679 (lang_input_statement_type
*, lang_statement_list_type
*);
682 ldlang_override_segment_assignment
683 (struct bfd_link_info
*, bfd
*, asection
*, asection
*, bfd_boolean
);
686 lang_ld_feature (char *);