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. 5 6 This file is part of GLD, the Gnu Linker. 7 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) 11 any later version. 12 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. 17 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 21 02110-1301, USA. */ 22 23#ifndef LDLANG_H 24#define LDLANG_H 25 26#define DEFAULT_MEMORY_REGION "*default*" 27 28typedef enum 29{ 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; 37 38struct _fill_type 39{ 40 size_t size; 41 unsigned char data[1]; 42}; 43 44typedef struct statement_list 45{ 46 union lang_statement_union *head; 47 union lang_statement_union **tail; 48} lang_statement_list_type; 49 50typedef struct memory_region_struct 51{ 52 char *name; 53 struct memory_region_struct *next; 54 bfd_vma origin; 55 bfd_size_type length; 56 bfd_vma current; 57 union lang_statement_union *last_os; 58 flagword flags; 59 flagword not_flags; 60 bfd_boolean had_full_message; 61} lang_memory_region_type; 62 63typedef struct lang_statement_header_struct 64{ 65 union lang_statement_union *next; 66 enum statement_enum 67 { 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, 82 83 lang_afile_asection_pair_statement_enum, 84 lang_constructors_statement_enum 85 } type; 86} lang_statement_header_type; 87 88typedef struct 89{ 90 lang_statement_header_type header; 91 union etree_union *exp; 92} lang_assignment_statement_type; 93 94typedef struct lang_target_statement_struct 95{ 96 lang_statement_header_type header; 97 const char *target; 98} lang_target_statement_type; 99 100typedef struct lang_output_statement_struct 101{ 102 lang_statement_header_type header; 103 const char *name; 104} lang_output_statement_type; 105 106/* Section types specified in a linker script. */ 107 108enum section_type 109{ 110 normal_section, 111 overlay_section, 112 noload_section, 113 noalloc_section 114}; 115 116/* This structure holds a list of program headers describing 117 segments in which this section should be placed. */ 118 119typedef struct lang_output_section_phdr_list 120{ 121 struct lang_output_section_phdr_list *next; 122 const char *name; 123 bfd_boolean used; 124} lang_output_section_phdr_list; 125 126typedef struct lang_output_section_statement_struct 127{ 128 lang_statement_header_type header; 129 lang_statement_list_type children; 130 struct lang_output_section_statement_struct *next; 131 struct lang_output_section_statement_struct *prev; 132 const char *name; 133 asection *bfd_section; 134 lang_memory_region_type *region; 135 lang_memory_region_type *lma_region; 136 fill_type *fill; 137 union etree_union *addr_tree; 138 union etree_union *load_base; 139 140 /* If non-null, an expression to evaluate after setting the section's 141 size. The expression is evaluated inside REGION (above) with '.' 142 set to the end of the section. Used in the last overlay section 143 to move '.' past all the overlaid sections. */ 144 union etree_union *update_dot_tree; 145 146 lang_output_section_phdr_list *phdrs; 147 148 unsigned int block_value; 149 int subsection_alignment; /* Alignment of components. */ 150 int section_alignment; /* Alignment of start of section. */ 151 int constraint; 152 flagword flags; 153 enum section_type sectype; 154 unsigned int processed_vma : 1; 155 unsigned int processed_lma : 1; 156 unsigned int all_input_readonly : 1; 157 /* If this section should be ignored. */ 158 unsigned int ignored : 1; 159 /* If there is a symbol relative to this section. */ 160 unsigned int section_relative_symbol : 1; 161} lang_output_section_statement_type; 162 163typedef struct 164{ 165 lang_statement_header_type header; 166} lang_common_statement_type; 167 168typedef struct 169{ 170 lang_statement_header_type header; 171} lang_object_symbols_statement_type; 172 173typedef struct 174{ 175 lang_statement_header_type header; 176 fill_type *fill; 177 int size; 178 asection *output_section; 179} lang_fill_statement_type; 180 181typedef struct 182{ 183 lang_statement_header_type header; 184 unsigned int type; 185 union etree_union *exp; 186 bfd_vma value; 187 asection *output_section; 188 bfd_vma output_offset; 189} lang_data_statement_type; 190 191/* Generate a reloc in the output file. */ 192 193typedef struct 194{ 195 lang_statement_header_type header; 196 197 /* Reloc to generate. */ 198 bfd_reloc_code_real_type reloc; 199 200 /* Reloc howto structure. */ 201 reloc_howto_type *howto; 202 203 /* Section to generate reloc against. 204 Exactly one of section and name must be NULL. */ 205 asection *section; 206 207 /* Name of symbol to generate reloc against. 208 Exactly one of section and name must be NULL. */ 209 const char *name; 210 211 /* Expression for addend. */ 212 union etree_union *addend_exp; 213 214 /* Resolved addend. */ 215 bfd_vma addend_value; 216 217 /* Output section where reloc should be performed. */ 218 asection *output_section; 219 220 /* Offset within output section. */ 221 bfd_vma output_offset; 222} lang_reloc_statement_type; 223 224typedef struct lang_input_statement_struct 225{ 226 lang_statement_header_type header; 227 /* Name of this file. */ 228 const char *filename; 229 /* Name to use for the symbol giving address of text start. 230 Usually the same as filename, but for a file spec'd with 231 -l this is the -l switch itself rather than the filename. */ 232 const char *local_sym_name; 233 234 bfd *the_bfd; 235 236 file_ptr passive_position; 237 238 /* Symbol table of the file. */ 239 asymbol **asymbols; 240 unsigned int symbol_count; 241 242 /* Point to the next file - whatever it is, wanders up and down 243 archives */ 244 union lang_statement_union *next; 245 246 /* Point to the next file, but skips archive contents. */ 247 union lang_statement_union *next_real_file; 248 249 const char *target; 250 251 unsigned int closed : 1; 252 unsigned int is_archive : 1; 253 254 /* 1 means search a set of directories for this file. */ 255 unsigned int search_dirs_flag : 1; 256 257 /* 1 means this was found in a search directory marked as sysrooted, 258 if search_dirs_flag is false, otherwise, that it should be 259 searched in ld_sysroot before any other location, as long as it 260 starts with a slash. */ 261 unsigned int sysrooted : 1; 262 263 /* 1 means this is base file of incremental load. 264 Do not load this file's text or data. 265 Also default text_start to after this file's bss. */ 266 unsigned int just_syms_flag : 1; 267 268 /* Whether to search for this entry as a dynamic archive. */ 269 unsigned int dynamic : 1; 270 271 /* Whether DT_NEEDED tags should be added for dynamic libraries in 272 DT_NEEDED tags from this entry. */ 273 unsigned int add_needed : 1; 274 275 /* Whether this entry should cause a DT_NEEDED tag only when 276 satisfying references from regular files, or always. */ 277 unsigned int as_needed : 1; 278 279 /* Whether to include the entire contents of an archive. */ 280 unsigned int whole_archive : 1; 281 282 unsigned int loaded : 1; 283 284 unsigned int real : 1; 285} lang_input_statement_type; 286 287typedef struct 288{ 289 lang_statement_header_type header; 290 asection *section; 291} lang_input_section_type; 292 293typedef struct 294{ 295 lang_statement_header_type header; 296 asection *section; 297 union lang_statement_union *file; 298} lang_afile_asection_pair_statement_type; 299 300typedef struct lang_wild_statement_struct lang_wild_statement_type; 301 302typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *, 303 asection *, lang_input_statement_type *, void *); 304 305typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *, 306 lang_input_statement_type *, 307 callback_t callback, 308 void *data); 309 310typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *, 311 bfd *, const asection *); 312 313/* Binary search tree structure to efficiently sort sections by 314 name. */ 315typedef struct lang_section_bst 316{ 317 asection *section; 318 struct lang_section_bst *left; 319 struct lang_section_bst *right; 320} lang_section_bst_type; 321 322struct lang_wild_statement_struct 323{ 324 lang_statement_header_type header; 325 const char *filename; 326 bfd_boolean filenames_sorted; 327 struct wildcard_list *section_list; 328 bfd_boolean keep_sections; 329 lang_statement_list_type children; 330 331 walk_wild_section_handler_t walk_wild_section_handler; 332 struct wildcard_list *handler_data[4]; 333 lang_section_bst_type *tree; 334}; 335 336typedef struct lang_address_statement_struct 337{ 338 lang_statement_header_type header; 339 const char *section_name; 340 union etree_union *address; 341 const segment_type *segment; 342} lang_address_statement_type; 343 344typedef struct 345{ 346 lang_statement_header_type header; 347 bfd_vma output_offset; 348 size_t size; 349 asection *output_section; 350 fill_type *fill; 351} lang_padding_statement_type; 352 353/* A group statement collects a set of libraries together. The 354 libraries are searched multiple times, until no new undefined 355 symbols are found. The effect is to search a group of libraries as 356 though they were a single library. */ 357 358typedef struct 359{ 360 lang_statement_header_type header; 361 lang_statement_list_type children; 362} lang_group_statement_type; 363 364typedef union lang_statement_union 365{ 366 lang_statement_header_type header; 367 lang_wild_statement_type wild_statement; 368 lang_data_statement_type data_statement; 369 lang_reloc_statement_type reloc_statement; 370 lang_address_statement_type address_statement; 371 lang_output_section_statement_type output_section_statement; 372 lang_afile_asection_pair_statement_type afile_asection_pair_statement; 373 lang_assignment_statement_type assignment_statement; 374 lang_input_statement_type input_statement; 375 lang_target_statement_type target_statement; 376 lang_output_statement_type output_statement; 377 lang_input_section_type input_section; 378 lang_common_statement_type common_statement; 379 lang_object_symbols_statement_type object_symbols_statement; 380 lang_fill_statement_type fill_statement; 381 lang_padding_statement_type padding_statement; 382 lang_group_statement_type group_statement; 383} lang_statement_union_type; 384 385/* This structure holds information about a program header, from the 386 PHDRS command in the linker script. */ 387 388struct lang_phdr 389{ 390 struct lang_phdr *next; 391 const char *name; 392 unsigned long type; 393 bfd_boolean filehdr; 394 bfd_boolean phdrs; 395 etree_type *at; 396 etree_type *flags; 397}; 398 399extern struct lang_phdr *lang_phdr_list; 400 401/* This structure is used to hold a list of sections which may not 402 cross reference each other. */ 403 404typedef struct lang_nocrossref 405{ 406 struct lang_nocrossref *next; 407 const char *name; 408} lang_nocrossref_type; 409 410/* The list of nocrossref lists. */ 411 412struct lang_nocrossrefs 413{ 414 struct lang_nocrossrefs *next; 415 lang_nocrossref_type *list; 416}; 417 418extern struct lang_nocrossrefs *nocrossref_list; 419 420/* This structure is used to hold a list of input section names which 421 will not match an output section in the linker script. */ 422 423struct unique_sections 424{ 425 struct unique_sections *next; 426 const char *name; 427}; 428 429/* This structure records symbols for which we need to keep track of 430 definedness for use in the DEFINED () test. */ 431 432struct lang_definedness_hash_entry 433{ 434 struct bfd_hash_entry root; 435 int iteration; 436}; 437 438/* Used by place_orphan to keep track of orphan sections and statements. */ 439 440struct orphan_save { 441 const char *name; 442 flagword flags; 443 lang_output_section_statement_type *os; 444 asection **section; 445 lang_statement_union_type **stmt; 446 lang_output_section_statement_type **os_tail; 447}; 448 449extern lang_output_section_statement_type *abs_output_section; 450extern lang_statement_list_type lang_output_section_statement; 451extern bfd_boolean lang_has_input_file; 452extern etree_type *base; 453extern lang_statement_list_type *stat_ptr; 454extern bfd_boolean delete_output_file_on_failure; 455 456extern struct bfd_sym_chain entry_symbol; 457extern const char *entry_section; 458extern bfd_boolean entry_from_cmdline; 459extern lang_statement_list_type file_chain; 460extern lang_statement_list_type input_file_chain; 461 462extern int lang_statement_iteration; 463 464extern void lang_init 465 (void); 466extern void lang_finish 467 (void); 468extern lang_memory_region_type *lang_memory_region_lookup 469 (const char *const, bfd_boolean); 470extern lang_memory_region_type *lang_memory_region_default 471 (asection *); 472extern void lang_map 473 (void); 474extern void lang_set_flags 475 (lang_memory_region_type *, const char *, int); 476extern void lang_add_output 477 (const char *, int from_script); 478extern lang_output_section_statement_type *lang_enter_output_section_statement 479 (const char *output_section_statement_name, 480 etree_type *address_exp, 481 enum section_type sectype, 482 etree_type *align, 483 etree_type *subalign, 484 etree_type *, int); 485extern void lang_final 486 (void); 487extern void lang_process 488 (void); 489extern void lang_section_start 490 (const char *, union etree_union *, const segment_type *); 491extern void lang_add_entry 492 (const char *, bfd_boolean); 493extern void lang_default_entry 494 (const char *); 495extern void lang_add_target 496 (const char *); 497extern void lang_add_wild 498 (struct wildcard_spec *, struct wildcard_list *, bfd_boolean); 499extern void lang_add_map 500 (const char *); 501extern void lang_add_fill 502 (fill_type *); 503extern lang_assignment_statement_type *lang_add_assignment 504 (union etree_union *); 505extern void lang_add_attribute 506 (enum statement_enum); 507extern void lang_startup 508 (const char *); 509extern void lang_float 510 (bfd_boolean); 511extern void lang_leave_output_section_statement 512 (fill_type *, const char *, lang_output_section_phdr_list *, 513 const char *); 514extern void lang_abs_symbol_at_end_of 515 (const char *, const char *); 516extern void lang_abs_symbol_at_beginning_of 517 (const char *, const char *); 518extern void lang_statement_append 519 (lang_statement_list_type *, lang_statement_union_type *, 520 lang_statement_union_type **); 521extern void lang_for_each_input_file 522 (void (*dothis) (lang_input_statement_type *)); 523extern void lang_for_each_file 524 (void (*dothis) (lang_input_statement_type *)); 525extern void lang_reset_memory_regions 526 (void); 527extern void lang_do_assignments 528 (void); 529 530#define LANG_FOR_EACH_INPUT_STATEMENT(statement) \ 531 lang_input_statement_type *statement; \ 532 for (statement = (lang_input_statement_type *) file_chain.head; \ 533 statement != (lang_input_statement_type *) NULL; \ 534 statement = (lang_input_statement_type *) statement->next) \ 535 536extern void lang_process 537 (void); 538extern void ldlang_add_file 539 (lang_input_statement_type *); 540extern lang_output_section_statement_type *lang_output_section_find 541 (const char * const); 542extern lang_output_section_statement_type *lang_output_section_find_by_flags 543 (const asection *, lang_output_section_statement_type **, 544 lang_match_sec_type_func); 545extern lang_output_section_statement_type *lang_insert_orphan 546 (asection *, const char *, lang_output_section_statement_type *, 547 struct orphan_save *, etree_type *, lang_statement_list_type *); 548extern lang_input_statement_type *lang_add_input_file 549 (const char *, lang_input_file_enum_type, const char *); 550extern void lang_add_keepsyms_file 551 (const char *); 552extern lang_output_section_statement_type * 553 lang_output_section_statement_lookup 554 (const char *const); 555extern void ldlang_add_undef 556 (const char *const); 557extern void lang_add_output_format 558 (const char *, const char *, const char *, int); 559extern void lang_list_init 560 (lang_statement_list_type *); 561extern void lang_add_data 562 (int type, union etree_union *); 563extern void lang_add_reloc 564 (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *, 565 union etree_union *); 566extern void lang_for_each_statement 567 (void (*) (lang_statement_union_type *)); 568extern void *stat_alloc 569 (size_t); 570extern void strip_excluded_output_sections 571 (void); 572extern void dprint_statement 573 (lang_statement_union_type *, int); 574extern void lang_size_sections 575 (bfd_boolean *, bfd_boolean); 576extern void one_lang_size_sections_pass 577 (bfd_boolean *, bfd_boolean); 578extern void lang_enter_group 579 (void); 580extern void lang_leave_group 581 (void); 582extern void lang_add_section 583 (lang_statement_list_type *, asection *, 584 lang_output_section_statement_type *); 585extern void lang_new_phdr 586 (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *, 587 etree_type *); 588extern void lang_add_nocrossref 589 (lang_nocrossref_type *); 590extern void lang_enter_overlay 591 (etree_type *, etree_type *); 592extern void lang_enter_overlay_section 593 (const char *); 594extern void lang_leave_overlay_section 595 (fill_type *, lang_output_section_phdr_list *); 596extern void lang_leave_overlay 597 (etree_type *, int, fill_type *, const char *, 598 lang_output_section_phdr_list *, const char *); 599 600extern struct bfd_elf_version_tree *lang_elf_version_info; 601 602extern struct bfd_elf_version_expr *lang_new_vers_pattern 603 (struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean); 604extern struct bfd_elf_version_tree *lang_new_vers_node 605 (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *); 606extern struct bfd_elf_version_deps *lang_add_vers_depend 607 (struct bfd_elf_version_deps *, const char *); 608extern void lang_register_vers_node 609 (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *); 610extern void lang_append_dynamic_list (struct bfd_elf_version_expr *); 611extern void lang_append_dynamic_list_cpp_typeinfo (void); 612extern void lang_append_dynamic_list_cpp_new (void); 613bfd_boolean unique_section_p 614 (const asection *); 615extern void lang_add_unique 616 (const char *); 617extern const char *lang_get_output_target 618 (void); 619extern void lang_track_definedness (const char *); 620extern int lang_symbol_definition_iteration (const char *); 621extern void lang_update_definedness 622 (const char *, struct bfd_link_hash_entry *); 623 624extern void add_excluded_libs (const char *); 625extern bfd_boolean load_symbols 626 (lang_input_statement_type *, lang_statement_list_type *); 627 628extern bfd_boolean 629ldlang_override_segment_assignment 630 (struct bfd_link_info *, bfd *, asection *, asection *, bfd_boolean); 631 632#endif 633