1 /* ldlang.h - linker command language support
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 Free Software Foundation, Inc.
6 This file is part of the GNU Binutils.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
26 #define DEFAULT_MEMORY_REGION "*default*"
30 lang_input_file_is_l_enum,
31 lang_input_file_is_symbols_only_enum,
32 lang_input_file_is_marker_enum,
33 lang_input_file_is_fake_enum,
34 lang_input_file_is_search_file_enum,
35 lang_input_file_is_file_enum
36 } lang_input_file_enum_type;
41 unsigned char data[1];
44 typedef struct statement_list
46 union lang_statement_union * head;
47 union lang_statement_union ** tail;
48 } lang_statement_list_type;
50 typedef struct memory_region_name_struct
53 struct memory_region_name_struct * next;
54 } lang_memory_region_name;
56 typedef struct memory_region_struct
58 lang_memory_region_name name_list;
59 struct memory_region_struct *next;
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 there is a symbol relative to this section. */
167 unsigned int section_relative_symbol : 1;
168 } lang_output_section_statement_type;
172 lang_statement_header_type header;
173 } lang_common_statement_type;
177 lang_statement_header_type header;
178 } lang_object_symbols_statement_type;
182 lang_statement_header_type header;
185 asection *output_section;
186 } lang_fill_statement_type;
190 lang_statement_header_type header;
192 union etree_union *exp;
194 asection *output_section;
195 bfd_vma output_offset;
196 } lang_data_statement_type;
198 /* Generate a reloc in the output file. */
202 lang_statement_header_type header;
204 /* Reloc to generate. */
205 bfd_reloc_code_real_type reloc;
207 /* Reloc howto structure. */
208 reloc_howto_type *howto;
210 /* Section to generate reloc against.
211 Exactly one of section and name must be NULL. */
214 /* Name of symbol to generate reloc against.
215 Exactly one of section and name must be NULL. */
218 /* Expression for addend. */
219 union etree_union *addend_exp;
221 /* Resolved addend. */
222 bfd_vma addend_value;
224 /* Output section where reloc should be performed. */
225 asection *output_section;
227 /* Offset within output section. */
228 bfd_vma output_offset;
229 } lang_reloc_statement_type;
231 struct lang_input_statement_flags
233 /* 1 means this file was specified in a -l option. */
234 unsigned int maybe_archive : 1;
236 /* 1 means search a set of directories for this file. */
237 unsigned int search_dirs : 1;
239 /* 1 means this was found when processing a script in the sysroot. */
240 unsigned int sysrooted : 1;
242 /* 1 means this is base file of incremental load.
243 Do not load this file's text or data.
244 Also default text_start to after this file's bss. */
245 unsigned int just_syms : 1;
247 /* Whether to search for this entry as a dynamic archive. */
248 unsigned int dynamic : 1;
250 /* Set if a DT_NEEDED tag should be added not just for the dynamic library
251 explicitly given by this entry but also for any dynamic libraries in
252 this entry's needed list. */
253 unsigned int add_DT_NEEDED_for_dynamic : 1;
255 /* Set if this entry should cause a DT_NEEDED tag only when some
256 regular file references its symbols (ie. --as-needed is in effect). */
257 unsigned int add_DT_NEEDED_for_regular : 1;
259 /* Whether to include the entire contents of an archive. */
260 unsigned int whole_archive : 1;
262 /* Set when bfd opening is successful. */
263 unsigned int loaded : 1;
265 unsigned int real : 1;
267 /* Set if the file does not exist. */
268 unsigned int missing_file : 1;
270 #ifdef ENABLE_PLUGINS
271 /* Set if the file was claimed by a plugin. */
272 unsigned int claimed : 1;
274 /* Set if the file was claimed from an archive. */
275 unsigned int claim_archive : 1;
277 /* Set if reloading an --as-needed lib. */
278 unsigned int reload : 1;
279 #endif /* ENABLE_PLUGINS */
282 typedef struct lang_input_statement_struct
284 lang_statement_header_type header;
285 /* Name of this file. */
286 const char *filename;
287 /* Name to use for the symbol giving address of text start.
288 Usually the same as filename, but for a file spec'd with
289 -l this is the -l switch itself rather than the filename. */
290 const char *local_sym_name;
294 struct flag_info *section_flag_list;
296 /* Point to the next file - whatever it is, wanders up and down
298 union lang_statement_union *next;
300 /* Point to the next file, but skips archive contents. */
301 union lang_statement_union *next_real_file;
305 struct lang_input_statement_flags flags;
306 } lang_input_statement_type;
310 lang_statement_header_type header;
312 } lang_input_section_type;
314 typedef struct lang_wild_statement_struct lang_wild_statement_type;
316 typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *,
317 asection *, struct flag_info *,
318 lang_input_statement_type *, void *);
320 typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *,
321 lang_input_statement_type *,
325 typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *,
326 bfd *, const asection *);
328 /* Binary search tree structure to efficiently sort sections by
330 typedef struct lang_section_bst
333 struct lang_section_bst *left;
334 struct lang_section_bst *right;
335 } lang_section_bst_type;
337 struct lang_wild_statement_struct
339 lang_statement_header_type header;
340 const char *filename;
341 bfd_boolean filenames_sorted;
342 struct wildcard_list *section_list;
343 bfd_boolean keep_sections;
344 lang_statement_list_type children;
346 walk_wild_section_handler_t walk_wild_section_handler;
347 struct wildcard_list *handler_data[4];
348 lang_section_bst_type *tree;
349 struct flag_info *section_flag_list;
352 typedef struct lang_address_statement_struct
354 lang_statement_header_type header;
355 const char *section_name;
356 union etree_union *address;
357 const segment_type *segment;
358 } lang_address_statement_type;
362 lang_statement_header_type header;
363 bfd_vma output_offset;
365 asection *output_section;
367 } lang_padding_statement_type;
369 /* A group statement collects a set of libraries together. The
370 libraries are searched multiple times, until no new undefined
371 symbols are found. The effect is to search a group of libraries as
372 though they were a single library. */
376 lang_statement_header_type header;
377 lang_statement_list_type children;
378 } lang_group_statement_type;
382 lang_statement_header_type header;
384 bfd_boolean is_before;
385 } lang_insert_statement_type;
387 typedef union lang_statement_union
389 lang_statement_header_type header;
390 lang_wild_statement_type wild_statement;
391 lang_data_statement_type data_statement;
392 lang_reloc_statement_type reloc_statement;
393 lang_address_statement_type address_statement;
394 lang_output_section_statement_type output_section_statement;
395 lang_assignment_statement_type assignment_statement;
396 lang_input_statement_type input_statement;
397 lang_target_statement_type target_statement;
398 lang_output_statement_type output_statement;
399 lang_input_section_type input_section;
400 lang_common_statement_type common_statement;
401 lang_object_symbols_statement_type object_symbols_statement;
402 lang_fill_statement_type fill_statement;
403 lang_padding_statement_type padding_statement;
404 lang_group_statement_type group_statement;
405 lang_insert_statement_type insert_statement;
406 } lang_statement_union_type;
408 /* This structure holds information about a program header, from the
409 PHDRS command in the linker script. */
413 struct lang_phdr *next;
422 /* This structure is used to hold a list of sections which may not
423 cross reference each other. */
425 typedef struct lang_nocrossref
427 struct lang_nocrossref *next;
429 } lang_nocrossref_type;
431 /* The list of nocrossref lists. */
433 struct lang_nocrossrefs
435 struct lang_nocrossrefs *next;
436 lang_nocrossref_type *list;
439 /* This structure is used to hold a list of input section names which
440 will not match an output section in the linker script. */
442 struct unique_sections
444 struct unique_sections *next;
448 /* This structure records symbols for which we need to keep track of
449 definedness for use in the DEFINED () test. */
451 struct lang_definedness_hash_entry
453 struct bfd_hash_entry root;
457 /* Used by place_orphan to keep track of orphan sections and statements. */
463 lang_output_section_statement_type *os;
465 lang_statement_union_type **stmt;
466 lang_output_section_statement_type **os_tail;
469 extern struct lang_phdr *lang_phdr_list;
470 extern struct lang_nocrossrefs *nocrossref_list;
471 extern const char *output_target;
472 extern lang_output_section_statement_type *abs_output_section;
473 extern lang_statement_list_type lang_output_section_statement;
474 extern struct lang_input_statement_flags input_flags;
475 extern bfd_boolean lang_has_input_file;
476 extern etree_type *base;
477 extern lang_statement_list_type *stat_ptr;
478 extern bfd_boolean delete_output_file_on_failure;
480 extern struct bfd_sym_chain entry_symbol;
481 extern const char *entry_section;
482 extern bfd_boolean entry_from_cmdline;
483 extern lang_statement_list_type file_chain;
484 extern lang_statement_list_type input_file_chain;
486 extern int lang_statement_iteration;
488 extern void lang_init
490 extern void lang_finish
492 extern lang_memory_region_type * lang_memory_region_lookup
493 (const char * const, bfd_boolean);
494 extern void lang_memory_region_alias
495 (const char *, const char *);
498 extern void lang_set_flags
499 (lang_memory_region_type *, const char *, int);
500 extern void lang_add_output
501 (const char *, int from_script);
502 extern lang_output_section_statement_type *lang_enter_output_section_statement
503 (const char *output_section_statement_name,
504 etree_type *address_exp,
505 enum section_type sectype,
507 etree_type *subalign,
509 extern void lang_final
511 extern void lang_relax_sections
513 extern void lang_process
515 extern void lang_section_start
516 (const char *, union etree_union *, const segment_type *);
517 extern void lang_add_entry
518 (const char *, bfd_boolean);
519 extern void lang_default_entry
521 extern void lang_add_target
523 extern void lang_add_wild
524 (struct wildcard_spec *, struct wildcard_list *, bfd_boolean);
525 extern void lang_add_map
527 extern void lang_add_fill
529 extern lang_assignment_statement_type *lang_add_assignment
530 (union etree_union *);
531 extern void lang_add_attribute
532 (enum statement_enum);
533 extern void lang_startup
535 extern void lang_float
537 extern void lang_leave_output_section_statement
538 (fill_type *, const char *, lang_output_section_phdr_list *,
540 extern void lang_abs_symbol_at_end_of
541 (const char *, const char *);
542 extern void lang_abs_symbol_at_beginning_of
543 (const char *, const char *);
544 extern void lang_statement_append
545 (lang_statement_list_type *, lang_statement_union_type *,
546 lang_statement_union_type **);
547 extern void lang_for_each_input_file
548 (void (*dothis) (lang_input_statement_type *));
549 extern void lang_for_each_file
550 (void (*dothis) (lang_input_statement_type *));
551 extern void lang_reset_memory_regions
553 extern void lang_do_assignments
556 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \
557 lang_input_statement_type *statement; \
558 for (statement = (lang_input_statement_type *) file_chain.head; \
559 statement != (lang_input_statement_type *) NULL; \
560 statement = (lang_input_statement_type *) statement->next) \
562 #define lang_output_section_find(NAME) \
563 lang_output_section_statement_lookup (NAME, 0, FALSE)
565 extern void lang_process
567 extern void ldlang_add_file
568 (lang_input_statement_type *);
569 extern lang_output_section_statement_type *lang_output_section_find_by_flags
570 (const asection *, lang_output_section_statement_type **,
571 lang_match_sec_type_func);
572 extern lang_output_section_statement_type *lang_insert_orphan
573 (asection *, const char *, int, lang_output_section_statement_type *,
574 struct orphan_save *, etree_type *, lang_statement_list_type *);
575 extern lang_input_statement_type *lang_add_input_file
576 (const char *, lang_input_file_enum_type, const char *);
577 extern void lang_add_keepsyms_file
579 extern lang_output_section_statement_type *lang_output_section_statement_lookup
580 (const char *, int, bfd_boolean);
581 extern lang_output_section_statement_type *next_matching_output_section_statement
582 (lang_output_section_statement_type *, int);
583 extern void ldlang_add_undef
584 (const char *const, bfd_boolean);
585 extern void lang_add_output_format
586 (const char *, const char *, const char *, int);
587 extern void lang_list_init
588 (lang_statement_list_type *);
589 extern void push_stat_ptr
590 (lang_statement_list_type *);
591 extern void pop_stat_ptr
593 extern void lang_add_data
594 (int type, union etree_union *);
595 extern void lang_add_reloc
596 (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *,
597 union etree_union *);
598 extern void lang_for_each_statement
599 (void (*) (lang_statement_union_type *));
600 extern void lang_for_each_statement_worker
601 (void (*) (lang_statement_union_type *), lang_statement_union_type *);
602 extern void *stat_alloc
604 extern void strip_excluded_output_sections
606 extern void dprint_statement
607 (lang_statement_union_type *, int);
608 extern void lang_size_sections
609 (bfd_boolean *, bfd_boolean);
610 extern void one_lang_size_sections_pass
611 (bfd_boolean *, bfd_boolean);
612 extern void lang_add_insert
614 extern void lang_enter_group
616 extern void lang_leave_group
618 extern void lang_add_section
619 (lang_statement_list_type *, asection *,
620 struct flag_info *, lang_output_section_statement_type *);
621 extern void lang_new_phdr
622 (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *,
624 extern void lang_add_nocrossref
625 (lang_nocrossref_type *);
626 extern void lang_enter_overlay
627 (etree_type *, etree_type *);
628 extern void lang_enter_overlay_section
630 extern void lang_leave_overlay_section
631 (fill_type *, lang_output_section_phdr_list *);
632 extern void lang_leave_overlay
633 (etree_type *, int, fill_type *, const char *,
634 lang_output_section_phdr_list *, const char *);
636 extern struct bfd_elf_version_expr *lang_new_vers_pattern
637 (struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean);
638 extern struct bfd_elf_version_tree *lang_new_vers_node
639 (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *);
640 extern struct bfd_elf_version_deps *lang_add_vers_depend
641 (struct bfd_elf_version_deps *, const char *);
642 extern void lang_register_vers_node
643 (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *);
644 extern void lang_append_dynamic_list (struct bfd_elf_version_expr *);
645 extern void lang_append_dynamic_list_cpp_typeinfo (void);
646 extern void lang_append_dynamic_list_cpp_new (void);
647 extern void lang_add_unique
649 extern const char *lang_get_output_target
651 extern void lang_track_definedness (const char *);
652 extern int lang_symbol_definition_iteration (const char *);
653 extern void lang_update_definedness
654 (const char *, struct bfd_link_hash_entry *);
656 extern void add_excluded_libs (const char *);
657 extern bfd_boolean load_symbols
658 (lang_input_statement_type *, lang_statement_list_type *);
661 ldlang_override_segment_assignment
662 (struct bfd_link_info *, bfd *, asection *, asection *, bfd_boolean);
665 lang_ld_feature (char *);