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
4 Free Software Foundation, Inc.
6 This file is part of GLD, the Gnu Linker.
8 GLD 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 2, or (at your option)
13 GLD 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 GLD; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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_struct
53 struct memory_region_struct *next;
57 union lang_statement_union *last_os;
60 bfd_boolean had_full_message;
61 } lang_memory_region_type;
63 typedef struct lang_statement_header_struct
65 union lang_statement_union *next;
68 lang_output_section_statement_enum,
69 lang_assignment_statement_enum,
70 lang_input_statement_enum,
71 lang_address_statement_enum,
72 lang_wild_statement_enum,
73 lang_input_section_enum,
74 lang_object_symbols_statement_enum,
75 lang_fill_statement_enum,
76 lang_data_statement_enum,
77 lang_reloc_statement_enum,
78 lang_target_statement_enum,
79 lang_output_statement_enum,
80 lang_padding_statement_enum,
81 lang_group_statement_enum,
83 lang_afile_asection_pair_statement_enum,
84 lang_constructors_statement_enum
86 } lang_statement_header_type;
90 lang_statement_header_type header;
91 union etree_union *exp;
92 } lang_assignment_statement_type;
94 typedef struct lang_target_statement_struct
96 lang_statement_header_type header;
98 } lang_target_statement_type;
100 typedef struct lang_output_statement_struct
102 lang_statement_header_type header;
104 } lang_output_statement_type;
106 /* Section types specified in a linker script. */
115 /* This structure holds a list of program headers describing
116 segments in which this section should be placed. */
118 typedef struct lang_output_section_phdr_list
120 struct lang_output_section_phdr_list *next;
123 } lang_output_section_phdr_list;
125 typedef struct lang_output_section_statement_struct
127 lang_statement_header_type header;
128 lang_statement_list_type children;
129 struct lang_output_section_statement_struct *next;
130 struct lang_output_section_statement_struct *prev;
132 asection *bfd_section;
133 lang_memory_region_type *region;
134 lang_memory_region_type *lma_region;
136 union etree_union *addr_tree;
137 union etree_union *load_base;
139 /* If non-null, an expression to evaluate after setting the section's
140 size. The expression is evaluated inside REGION (above) with '.'
141 set to the end of the section. Used in the last overlay section
142 to move '.' past all the overlaid sections. */
143 union etree_union *update_dot_tree;
145 lang_output_section_phdr_list *phdrs;
147 unsigned int block_value;
148 int subsection_alignment; /* Alignment of components. */
149 int section_alignment; /* Alignment of start of section. */
152 enum section_type sectype;
153 unsigned int processed_vma : 1;
154 unsigned int processed_lma : 1;
155 unsigned int all_input_readonly : 1;
156 /* If this section should be ignored. */
157 unsigned int ignored : 1;
158 /* If there is a symbol relative to this section. */
159 unsigned int section_relative_symbol : 1;
160 } lang_output_section_statement_type;
164 lang_statement_header_type header;
165 } lang_common_statement_type;
169 lang_statement_header_type header;
170 } lang_object_symbols_statement_type;
174 lang_statement_header_type header;
177 asection *output_section;
178 } lang_fill_statement_type;
182 lang_statement_header_type header;
184 union etree_union *exp;
186 asection *output_section;
187 bfd_vma output_offset;
188 } lang_data_statement_type;
190 /* Generate a reloc in the output file. */
194 lang_statement_header_type header;
196 /* Reloc to generate. */
197 bfd_reloc_code_real_type reloc;
199 /* Reloc howto structure. */
200 reloc_howto_type *howto;
202 /* Section to generate reloc against.
203 Exactly one of section and name must be NULL. */
206 /* Name of symbol to generate reloc against.
207 Exactly one of section and name must be NULL. */
210 /* Expression for addend. */
211 union etree_union *addend_exp;
213 /* Resolved addend. */
214 bfd_vma addend_value;
216 /* Output section where reloc should be performed. */
217 asection *output_section;
219 /* Offset within output section. */
220 bfd_vma output_offset;
221 } lang_reloc_statement_type;
223 typedef struct lang_input_statement_struct
225 lang_statement_header_type header;
226 /* Name of this file. */
227 const char *filename;
228 /* Name to use for the symbol giving address of text start.
229 Usually the same as filename, but for a file spec'd with
230 -l this is the -l switch itself rather than the filename. */
231 const char *local_sym_name;
235 file_ptr passive_position;
237 /* Symbol table of the file. */
239 unsigned int symbol_count;
241 /* Point to the next file - whatever it is, wanders up and down
243 union lang_statement_union *next;
245 /* Point to the next file, but skips archive contents. */
246 union lang_statement_union *next_real_file;
250 unsigned int closed : 1;
251 unsigned int is_archive : 1;
253 /* 1 means search a set of directories for this file. */
254 unsigned int search_dirs_flag : 1;
256 /* 1 means this was found in a search directory marked as sysrooted,
257 if search_dirs_flag is false, otherwise, that it should be
258 searched in ld_sysroot before any other location, as long as it
259 starts with a slash. */
260 unsigned int sysrooted : 1;
262 /* 1 means this is base file of incremental load.
263 Do not load this file's text or data.
264 Also default text_start to after this file's bss. */
265 unsigned int just_syms_flag : 1;
267 /* Whether to search for this entry as a dynamic archive. */
268 unsigned int dynamic : 1;
270 /* Whether DT_NEEDED tags should be added for dynamic libraries in
271 DT_NEEDED tags from this entry. */
272 unsigned int add_needed : 1;
274 /* Whether this entry should cause a DT_NEEDED tag only when
275 satisfying references from regular files, or always. */
276 unsigned int as_needed : 1;
278 /* Whether to include the entire contents of an archive. */
279 unsigned int whole_archive : 1;
281 unsigned int loaded : 1;
283 unsigned int real : 1;
284 } lang_input_statement_type;
288 lang_statement_header_type header;
290 } lang_input_section_type;
294 lang_statement_header_type header;
296 union lang_statement_union *file;
297 } lang_afile_asection_pair_statement_type;
299 typedef struct lang_wild_statement_struct lang_wild_statement_type;
301 typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *,
302 asection *, lang_input_statement_type *, void *);
304 typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *,
305 lang_input_statement_type *,
309 typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *,
310 bfd *, const asection *);
312 /* Binary search tree structure to efficiently sort sections by
314 typedef struct lang_section_bst
317 struct lang_section_bst *left;
318 struct lang_section_bst *right;
319 } lang_section_bst_type;
321 struct lang_wild_statement_struct
323 lang_statement_header_type header;
324 const char *filename;
325 bfd_boolean filenames_sorted;
326 struct wildcard_list *section_list;
327 bfd_boolean keep_sections;
328 lang_statement_list_type children;
330 walk_wild_section_handler_t walk_wild_section_handler;
331 struct wildcard_list *handler_data[4];
332 lang_section_bst_type *tree;
335 typedef struct lang_address_statement_struct
337 lang_statement_header_type header;
338 const char *section_name;
339 union etree_union *address;
340 const segment_type *segment;
341 } lang_address_statement_type;
345 lang_statement_header_type header;
346 bfd_vma output_offset;
348 asection *output_section;
350 } lang_padding_statement_type;
352 /* A group statement collects a set of libraries together. The
353 libraries are searched multiple times, until no new undefined
354 symbols are found. The effect is to search a group of libraries as
355 though they were a single library. */
359 lang_statement_header_type header;
360 lang_statement_list_type children;
361 } lang_group_statement_type;
363 typedef union lang_statement_union
365 lang_statement_header_type header;
366 lang_wild_statement_type wild_statement;
367 lang_data_statement_type data_statement;
368 lang_reloc_statement_type reloc_statement;
369 lang_address_statement_type address_statement;
370 lang_output_section_statement_type output_section_statement;
371 lang_afile_asection_pair_statement_type afile_asection_pair_statement;
372 lang_assignment_statement_type assignment_statement;
373 lang_input_statement_type input_statement;
374 lang_target_statement_type target_statement;
375 lang_output_statement_type output_statement;
376 lang_input_section_type input_section;
377 lang_common_statement_type common_statement;
378 lang_object_symbols_statement_type object_symbols_statement;
379 lang_fill_statement_type fill_statement;
380 lang_padding_statement_type padding_statement;
381 lang_group_statement_type group_statement;
382 } lang_statement_union_type;
384 /* This structure holds information about a program header, from the
385 PHDRS command in the linker script. */
389 struct lang_phdr *next;
398 extern struct lang_phdr *lang_phdr_list;
400 /* This structure is used to hold a list of sections which may not
401 cross reference each other. */
403 typedef struct lang_nocrossref
405 struct lang_nocrossref *next;
407 } lang_nocrossref_type;
409 /* The list of nocrossref lists. */
411 struct lang_nocrossrefs
413 struct lang_nocrossrefs *next;
414 lang_nocrossref_type *list;
417 extern struct lang_nocrossrefs *nocrossref_list;
419 /* This structure is used to hold a list of input section names which
420 will not match an output section in the linker script. */
422 struct unique_sections
424 struct unique_sections *next;
428 /* This structure records symbols for which we need to keep track of
429 definedness for use in the DEFINED () test. */
431 struct lang_definedness_hash_entry
433 struct bfd_hash_entry root;
437 /* Used by place_orphan to keep track of orphan sections and statements. */
442 lang_output_section_statement_type *os;
444 lang_statement_union_type **stmt;
445 lang_output_section_statement_type **os_tail;
448 extern lang_output_section_statement_type *abs_output_section;
449 extern lang_statement_list_type lang_output_section_statement;
450 extern bfd_boolean lang_has_input_file;
451 extern etree_type *base;
452 extern lang_statement_list_type *stat_ptr;
453 extern bfd_boolean delete_output_file_on_failure;
455 extern struct bfd_sym_chain entry_symbol;
456 extern const char *entry_section;
457 extern bfd_boolean entry_from_cmdline;
458 extern lang_statement_list_type file_chain;
460 extern int lang_statement_iteration;
462 extern void lang_init
464 extern void lang_finish
466 extern lang_memory_region_type *lang_memory_region_lookup
467 (const char *const, bfd_boolean);
468 extern lang_memory_region_type *lang_memory_region_default
472 extern void lang_set_flags
473 (lang_memory_region_type *, const char *, int);
474 extern void lang_add_output
475 (const char *, int from_script);
476 extern lang_output_section_statement_type *lang_enter_output_section_statement
477 (const char *output_section_statement_name,
478 etree_type *address_exp,
479 enum section_type sectype,
481 etree_type *subalign,
483 extern void lang_final
485 extern void lang_process
487 extern void lang_section_start
488 (const char *, union etree_union *, const segment_type *);
489 extern void lang_add_entry
490 (const char *, bfd_boolean);
491 extern void lang_default_entry
493 extern void lang_add_target
495 extern void lang_add_wild
496 (struct wildcard_spec *, struct wildcard_list *, bfd_boolean);
497 extern void lang_add_map
499 extern void lang_add_fill
501 extern lang_assignment_statement_type *lang_add_assignment
502 (union etree_union *);
503 extern void lang_add_attribute
504 (enum statement_enum);
505 extern void lang_startup
507 extern void lang_float
509 extern void lang_leave_output_section_statement
510 (fill_type *, const char *, lang_output_section_phdr_list *,
512 extern void lang_abs_symbol_at_end_of
513 (const char *, const char *);
514 extern void lang_abs_symbol_at_beginning_of
515 (const char *, const char *);
516 extern void lang_statement_append
517 (lang_statement_list_type *, lang_statement_union_type *,
518 lang_statement_union_type **);
519 extern void lang_for_each_input_file
520 (void (*dothis) (lang_input_statement_type *));
521 extern void lang_for_each_file
522 (void (*dothis) (lang_input_statement_type *));
523 extern void lang_reset_memory_regions
525 extern void lang_do_assignments
528 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \
529 lang_input_statement_type *statement; \
530 for (statement = (lang_input_statement_type *) file_chain.head; \
531 statement != (lang_input_statement_type *) NULL; \
532 statement = (lang_input_statement_type *) statement->next) \
534 extern void lang_process
536 extern void ldlang_add_file
537 (lang_input_statement_type *);
538 extern lang_output_section_statement_type *lang_output_section_find
539 (const char * const);
540 extern lang_output_section_statement_type *lang_output_section_find_by_flags
541 (const asection *, lang_output_section_statement_type **,
542 lang_match_sec_type_func);
543 extern lang_output_section_statement_type *lang_insert_orphan
544 (asection *, const char *, lang_output_section_statement_type *,
545 struct orphan_save *, etree_type *, lang_statement_list_type *);
546 extern lang_input_statement_type *lang_add_input_file
547 (const char *, lang_input_file_enum_type, const char *);
548 extern void lang_add_keepsyms_file
550 extern lang_output_section_statement_type *
551 lang_output_section_statement_lookup
553 extern void ldlang_add_undef
555 extern void lang_add_output_format
556 (const char *, const char *, const char *, int);
557 extern void lang_list_init
558 (lang_statement_list_type *);
559 extern void lang_add_data
560 (int type, union etree_union *);
561 extern void lang_add_reloc
562 (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *,
563 union etree_union *);
564 extern void lang_for_each_statement
565 (void (*) (lang_statement_union_type *));
566 extern void *stat_alloc
568 extern void strip_excluded_output_sections
570 extern void dprint_statement
571 (lang_statement_union_type *, int);
572 extern void lang_size_sections
573 (bfd_boolean *, bfd_boolean);
574 extern void one_lang_size_sections_pass
575 (bfd_boolean *, bfd_boolean);
576 extern void lang_enter_group
578 extern void lang_leave_group
580 extern void lang_add_section
581 (lang_statement_list_type *, asection *,
582 lang_output_section_statement_type *);
583 extern void lang_new_phdr
584 (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *,
586 extern void lang_add_nocrossref
587 (lang_nocrossref_type *);
588 extern void lang_enter_overlay
589 (etree_type *, etree_type *);
590 extern void lang_enter_overlay_section
592 extern void lang_leave_overlay_section
593 (fill_type *, lang_output_section_phdr_list *);
594 extern void lang_leave_overlay
595 (etree_type *, int, fill_type *, const char *,
596 lang_output_section_phdr_list *, const char *);
598 extern struct bfd_elf_version_tree *lang_elf_version_info;
600 extern struct bfd_elf_version_expr *lang_new_vers_pattern
601 (struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean);
602 extern struct bfd_elf_version_tree *lang_new_vers_node
603 (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *);
604 extern struct bfd_elf_version_deps *lang_add_vers_depend
605 (struct bfd_elf_version_deps *, const char *);
606 extern void lang_register_vers_node
607 (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *);
608 extern void lang_append_dynamic_list (struct bfd_elf_version_expr *);
609 extern void lang_append_dynamic_list_cpp_typeinfo (void);
610 extern void lang_append_dynamic_list_cpp_new (void);
611 bfd_boolean unique_section_p
613 extern void lang_add_unique
615 extern const char *lang_get_output_target
617 extern void lang_track_definedness (const char *);
618 extern int lang_symbol_definition_iteration (const char *);
619 extern void lang_update_definedness
620 (const char *, struct bfd_link_hash_entry *);
622 extern void add_excluded_libs (const char *);
623 extern bfd_boolean load_symbols
624 (lang_input_statement_type *, lang_statement_list_type *);
627 ldlang_override_segment_assignment
628 (struct bfd_link_info *, bfd *, asection *, asection *, bfd_boolean);