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 4 Free Software Foundation, Inc. 5 6 This file is part of the GNU Binutils. 7 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. 12 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. 17 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. */ 22 23 #ifndef LDLANG_H 24 #define LDLANG_H 25 26 #define DEFAULT_MEMORY_REGION "*default*" 27 28 typedef 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 38 struct _fill_type 39 { 40 size_t size; 41 unsigned char data[1]; 42 }; 43 44 typedef struct statement_list 45 { 46 union lang_statement_union * head; 47 union lang_statement_union ** tail; 48 } lang_statement_list_type; 49 50 typedef struct memory_region_name_struct 51 { 52 const char * name; 53 struct memory_region_name_struct * next; 54 } lang_memory_region_name; 55 56 typedef struct memory_region_struct 57 { 58 lang_memory_region_name name_list; 59 struct memory_region_struct *next; 60 bfd_vma origin; 61 bfd_size_type length; 62 bfd_vma current; 63 union lang_statement_union *last_os; 64 flagword flags; 65 flagword not_flags; 66 bfd_boolean had_full_message; 67 } lang_memory_region_type; 68 69 enum statement_enum 70 { 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 87 }; 88 89 typedef struct lang_statement_header_struct 90 { 91 union lang_statement_union *next; 92 enum statement_enum type; 93 } lang_statement_header_type; 94 95 typedef struct 96 { 97 lang_statement_header_type header; 98 union etree_union *exp; 99 } lang_assignment_statement_type; 100 101 typedef struct lang_target_statement_struct 102 { 103 lang_statement_header_type header; 104 const char *target; 105 } lang_target_statement_type; 106 107 typedef struct lang_output_statement_struct 108 { 109 lang_statement_header_type header; 110 const char *name; 111 } lang_output_statement_type; 112 113 /* Section types specified in a linker script. */ 114 115 enum section_type 116 { 117 normal_section, 118 overlay_section, 119 noload_section, 120 noalloc_section 121 }; 122 123 /* This structure holds a list of program headers describing 124 segments in which this section should be placed. */ 125 126 typedef struct lang_output_section_phdr_list 127 { 128 struct lang_output_section_phdr_list *next; 129 const char *name; 130 bfd_boolean used; 131 } lang_output_section_phdr_list; 132 133 typedef struct lang_output_section_statement_struct 134 { 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; 139 const char *name; 140 asection *bfd_section; 141 lang_memory_region_type *region; 142 lang_memory_region_type *lma_region; 143 fill_type *fill; 144 union etree_union *addr_tree; 145 union etree_union *load_base; 146 147 /* 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; 152 153 lang_output_section_phdr_list *phdrs; 154 155 unsigned int block_value; 156 int subsection_alignment; /* Alignment of components. */ 157 int section_alignment; /* Alignment of start of section. */ 158 int constraint; 159 flagword flags; 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; 169 170 typedef struct 171 { 172 lang_statement_header_type header; 173 } lang_common_statement_type; 174 175 typedef struct 176 { 177 lang_statement_header_type header; 178 } lang_object_symbols_statement_type; 179 180 typedef struct 181 { 182 lang_statement_header_type header; 183 fill_type *fill; 184 int size; 185 asection *output_section; 186 } lang_fill_statement_type; 187 188 typedef struct 189 { 190 lang_statement_header_type header; 191 unsigned int type; 192 union etree_union *exp; 193 bfd_vma value; 194 asection *output_section; 195 bfd_vma output_offset; 196 } lang_data_statement_type; 197 198 /* Generate a reloc in the output file. */ 199 200 typedef struct 201 { 202 lang_statement_header_type header; 203 204 /* Reloc to generate. */ 205 bfd_reloc_code_real_type reloc; 206 207 /* Reloc howto structure. */ 208 reloc_howto_type *howto; 209 210 /* Section to generate reloc against. 211 Exactly one of section and name must be NULL. */ 212 asection *section; 213 214 /* Name of symbol to generate reloc against. 215 Exactly one of section and name must be NULL. */ 216 const char *name; 217 218 /* Expression for addend. */ 219 union etree_union *addend_exp; 220 221 /* Resolved addend. */ 222 bfd_vma addend_value; 223 224 /* Output section where reloc should be performed. */ 225 asection *output_section; 226 227 /* Offset within output section. */ 228 bfd_vma output_offset; 229 } lang_reloc_statement_type; 230 231 typedef struct lang_input_statement_struct 232 { 233 lang_statement_header_type header; 234 /* Name of this file. */ 235 const char *filename; 236 /* Name to use for the symbol giving address of text start. 237 Usually the same as filename, but for a file spec'd with 238 -l this is the -l switch itself rather than the filename. */ 239 const char *local_sym_name; 240 241 bfd *the_bfd; 242 243 /* Point to the next file - whatever it is, wanders up and down 244 archives */ 245 union lang_statement_union *next; 246 247 /* Point to the next file, but skips archive contents. */ 248 union lang_statement_union *next_real_file; 249 250 const char *target; 251 252 unsigned int maybe_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_DT_NEEDED_for_dynamic : 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 add_DT_NEEDED_for_regular : 1; 278 279 /* Whether to include the entire contents of an archive. */ 280 unsigned int whole_archive : 1; 281 282 /* Set when bfd opening is successful. */ 283 unsigned int loaded : 1; 284 285 unsigned int real : 1; 286 287 /* Set if the file does not exist. */ 288 unsigned int missing_file : 1; 289 290 #ifdef ENABLE_PLUGINS 291 /* Set if the file was claimed by a plugin. */ 292 unsigned int claimed : 1; 293 294 /* Set if the file was claimed from an archive. */ 295 unsigned int claim_archive : 1; 296 #endif /* ENABLE_PLUGINS */ 297 298 } lang_input_statement_type; 299 300 typedef struct 301 { 302 lang_statement_header_type header; 303 asection *section; 304 } lang_input_section_type; 305 306 typedef struct lang_wild_statement_struct lang_wild_statement_type; 307 308 typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *, 309 asection *, lang_input_statement_type *, void *); 310 311 typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *, 312 lang_input_statement_type *, 313 callback_t callback, 314 void *data); 315 316 typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *, 317 bfd *, const asection *); 318 319 /* Binary search tree structure to efficiently sort sections by 320 name. */ 321 typedef struct lang_section_bst 322 { 323 asection *section; 324 struct lang_section_bst *left; 325 struct lang_section_bst *right; 326 } lang_section_bst_type; 327 328 struct lang_wild_statement_struct 329 { 330 lang_statement_header_type header; 331 const char *filename; 332 bfd_boolean filenames_sorted; 333 struct wildcard_list *section_list; 334 bfd_boolean keep_sections; 335 lang_statement_list_type children; 336 337 walk_wild_section_handler_t walk_wild_section_handler; 338 struct wildcard_list *handler_data[4]; 339 lang_section_bst_type *tree; 340 }; 341 342 typedef struct lang_address_statement_struct 343 { 344 lang_statement_header_type header; 345 const char *section_name; 346 union etree_union *address; 347 const segment_type *segment; 348 } lang_address_statement_type; 349 350 typedef struct 351 { 352 lang_statement_header_type header; 353 bfd_vma output_offset; 354 size_t size; 355 asection *output_section; 356 fill_type *fill; 357 } lang_padding_statement_type; 358 359 /* A group statement collects a set of libraries together. The 360 libraries are searched multiple times, until no new undefined 361 symbols are found. The effect is to search a group of libraries as 362 though they were a single library. */ 363 364 typedef struct 365 { 366 lang_statement_header_type header; 367 lang_statement_list_type children; 368 } lang_group_statement_type; 369 370 typedef struct 371 { 372 lang_statement_header_type header; 373 const char *where; 374 bfd_boolean is_before; 375 } lang_insert_statement_type; 376 377 typedef union lang_statement_union 378 { 379 lang_statement_header_type header; 380 lang_wild_statement_type wild_statement; 381 lang_data_statement_type data_statement; 382 lang_reloc_statement_type reloc_statement; 383 lang_address_statement_type address_statement; 384 lang_output_section_statement_type output_section_statement; 385 lang_assignment_statement_type assignment_statement; 386 lang_input_statement_type input_statement; 387 lang_target_statement_type target_statement; 388 lang_output_statement_type output_statement; 389 lang_input_section_type input_section; 390 lang_common_statement_type common_statement; 391 lang_object_symbols_statement_type object_symbols_statement; 392 lang_fill_statement_type fill_statement; 393 lang_padding_statement_type padding_statement; 394 lang_group_statement_type group_statement; 395 lang_insert_statement_type insert_statement; 396 } lang_statement_union_type; 397 398 /* This structure holds information about a program header, from the 399 PHDRS command in the linker script. */ 400 401 struct lang_phdr 402 { 403 struct lang_phdr *next; 404 const char *name; 405 unsigned long type; 406 bfd_boolean filehdr; 407 bfd_boolean phdrs; 408 etree_type *at; 409 etree_type *flags; 410 }; 411 412 extern struct lang_phdr *lang_phdr_list; 413 414 /* This structure is used to hold a list of sections which may not 415 cross reference each other. */ 416 417 typedef struct lang_nocrossref 418 { 419 struct lang_nocrossref *next; 420 const char *name; 421 } lang_nocrossref_type; 422 423 /* The list of nocrossref lists. */ 424 425 struct lang_nocrossrefs 426 { 427 struct lang_nocrossrefs *next; 428 lang_nocrossref_type *list; 429 }; 430 431 extern struct lang_nocrossrefs *nocrossref_list; 432 433 /* This structure is used to hold a list of input section names which 434 will not match an output section in the linker script. */ 435 436 struct unique_sections 437 { 438 struct unique_sections *next; 439 const char *name; 440 }; 441 442 /* This structure records symbols for which we need to keep track of 443 definedness for use in the DEFINED () test. */ 444 445 struct lang_definedness_hash_entry 446 { 447 struct bfd_hash_entry root; 448 int iteration; 449 }; 450 451 /* Used by place_orphan to keep track of orphan sections and statements. */ 452 453 struct orphan_save 454 { 455 const char *name; 456 flagword flags; 457 lang_output_section_statement_type *os; 458 asection **section; 459 lang_statement_union_type **stmt; 460 lang_output_section_statement_type **os_tail; 461 }; 462 463 extern const char *output_target; 464 extern lang_output_section_statement_type *abs_output_section; 465 extern lang_statement_list_type lang_output_section_statement; 466 extern bfd_boolean lang_has_input_file; 467 extern etree_type *base; 468 extern lang_statement_list_type *stat_ptr; 469 extern bfd_boolean delete_output_file_on_failure; 470 471 extern struct bfd_sym_chain entry_symbol; 472 extern const char *entry_section; 473 extern bfd_boolean entry_from_cmdline; 474 extern lang_statement_list_type file_chain; 475 extern lang_statement_list_type input_file_chain; 476 477 extern int lang_statement_iteration; 478 extern bfd_boolean missing_file; 479 480 extern void lang_init 481 (void); 482 extern void lang_finish 483 (void); 484 extern lang_memory_region_type * lang_memory_region_lookup 485 (const char * const, bfd_boolean); 486 extern void lang_memory_region_alias 487 (const char *, const char *); 488 extern void lang_map 489 (void); 490 extern void lang_set_flags 491 (lang_memory_region_type *, const char *, int); 492 extern void lang_add_output 493 (const char *, int from_script); 494 extern lang_output_section_statement_type *lang_enter_output_section_statement 495 (const char *output_section_statement_name, 496 etree_type *address_exp, 497 enum section_type sectype, 498 etree_type *align, 499 etree_type *subalign, 500 etree_type *, int); 501 extern void lang_final 502 (void); 503 extern void lang_relax_sections 504 (bfd_boolean); 505 extern void lang_process 506 (void); 507 extern void lang_section_start 508 (const char *, union etree_union *, const segment_type *); 509 extern void lang_add_entry 510 (const char *, bfd_boolean); 511 extern void lang_default_entry 512 (const char *); 513 extern void lang_add_target 514 (const char *); 515 extern void lang_add_wild 516 (struct wildcard_spec *, struct wildcard_list *, bfd_boolean); 517 extern void lang_add_map 518 (const char *); 519 extern void lang_add_fill 520 (fill_type *); 521 extern lang_assignment_statement_type *lang_add_assignment 522 (union etree_union *); 523 extern void lang_add_attribute 524 (enum statement_enum); 525 extern void lang_startup 526 (const char *); 527 extern void lang_float 528 (bfd_boolean); 529 extern void lang_leave_output_section_statement 530 (fill_type *, const char *, lang_output_section_phdr_list *, 531 const char *); 532 extern void lang_abs_symbol_at_end_of 533 (const char *, const char *); 534 extern void lang_abs_symbol_at_beginning_of 535 (const char *, const char *); 536 extern void lang_statement_append 537 (lang_statement_list_type *, lang_statement_union_type *, 538 lang_statement_union_type **); 539 extern void lang_for_each_input_file 540 (void (*dothis) (lang_input_statement_type *)); 541 extern void lang_for_each_file 542 (void (*dothis) (lang_input_statement_type *)); 543 extern void lang_reset_memory_regions 544 (void); 545 extern void lang_do_assignments 546 (lang_phase_type); 547 548 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \ 549 lang_input_statement_type *statement; \ 550 for (statement = (lang_input_statement_type *) file_chain.head; \ 551 statement != (lang_input_statement_type *) NULL; \ 552 statement = (lang_input_statement_type *) statement->next) \ 553 554 #define lang_output_section_find(NAME) \ 555 lang_output_section_statement_lookup (NAME, 0, FALSE) 556 557 extern void lang_process 558 (void); 559 extern void ldlang_add_file 560 (lang_input_statement_type *); 561 extern lang_output_section_statement_type *lang_output_section_find_by_flags 562 (const asection *, lang_output_section_statement_type **, 563 lang_match_sec_type_func); 564 extern lang_output_section_statement_type *lang_insert_orphan 565 (asection *, const char *, int, lang_output_section_statement_type *, 566 struct orphan_save *, etree_type *, lang_statement_list_type *); 567 extern lang_input_statement_type *lang_add_input_file 568 (const char *, lang_input_file_enum_type, const char *); 569 extern void lang_add_keepsyms_file 570 (const char *); 571 extern lang_output_section_statement_type *lang_output_section_statement_lookup 572 (const char *, int, bfd_boolean); 573 extern lang_output_section_statement_type *next_matching_output_section_statement 574 (lang_output_section_statement_type *, int); 575 extern void ldlang_add_undef 576 (const char *const, bfd_boolean); 577 extern void lang_add_output_format 578 (const char *, const char *, const char *, int); 579 extern void lang_list_init 580 (lang_statement_list_type *); 581 extern void push_stat_ptr 582 (lang_statement_list_type *); 583 extern void pop_stat_ptr 584 (void); 585 extern void lang_add_data 586 (int type, union etree_union *); 587 extern void lang_add_reloc 588 (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *, 589 union etree_union *); 590 extern void lang_for_each_statement 591 (void (*) (lang_statement_union_type *)); 592 extern void lang_for_each_statement_worker 593 (void (*) (lang_statement_union_type *), lang_statement_union_type *); 594 extern void *stat_alloc 595 (size_t); 596 extern void strip_excluded_output_sections 597 (void); 598 extern void dprint_statement 599 (lang_statement_union_type *, int); 600 extern void lang_size_sections 601 (bfd_boolean *, bfd_boolean); 602 extern void one_lang_size_sections_pass 603 (bfd_boolean *, bfd_boolean); 604 extern void lang_add_insert 605 (const char *, int); 606 extern void lang_enter_group 607 (void); 608 extern void lang_leave_group 609 (void); 610 extern void lang_add_section 611 (lang_statement_list_type *, asection *, 612 lang_output_section_statement_type *); 613 extern void lang_new_phdr 614 (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *, 615 etree_type *); 616 extern void lang_add_nocrossref 617 (lang_nocrossref_type *); 618 extern void lang_enter_overlay 619 (etree_type *, etree_type *); 620 extern void lang_enter_overlay_section 621 (const char *); 622 extern void lang_leave_overlay_section 623 (fill_type *, lang_output_section_phdr_list *); 624 extern void lang_leave_overlay 625 (etree_type *, int, fill_type *, const char *, 626 lang_output_section_phdr_list *, const char *); 627 628 extern struct bfd_elf_version_tree *lang_elf_version_info; 629 630 extern struct bfd_elf_version_expr *lang_new_vers_pattern 631 (struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean); 632 extern struct bfd_elf_version_tree *lang_new_vers_node 633 (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *); 634 extern struct bfd_elf_version_deps *lang_add_vers_depend 635 (struct bfd_elf_version_deps *, const char *); 636 extern void lang_register_vers_node 637 (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *); 638 extern void lang_append_dynamic_list (struct bfd_elf_version_expr *); 639 extern void lang_append_dynamic_list_cpp_typeinfo (void); 640 extern void lang_append_dynamic_list_cpp_new (void); 641 extern void lang_add_unique 642 (const char *); 643 extern const char *lang_get_output_target 644 (void); 645 extern void lang_track_definedness (const char *); 646 extern int lang_symbol_definition_iteration (const char *); 647 extern void lang_update_definedness 648 (const char *, struct bfd_link_hash_entry *); 649 650 extern void add_excluded_libs (const char *); 651 extern bfd_boolean load_symbols 652 (lang_input_statement_type *, lang_statement_list_type *); 653 654 extern bfd_boolean 655 ldlang_override_segment_assignment 656 (struct bfd_link_info *, bfd *, asection *, asection *, bfd_boolean); 657 658 extern void 659 lang_ld_feature (char *); 660 661 #endif 662