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. 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 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 } lang_output_section_statement_type; 171 172 typedef struct 173 { 174 lang_statement_header_type header; 175 } lang_common_statement_type; 176 177 typedef struct 178 { 179 lang_statement_header_type header; 180 } lang_object_symbols_statement_type; 181 182 typedef struct 183 { 184 lang_statement_header_type header; 185 fill_type *fill; 186 int size; 187 asection *output_section; 188 } lang_fill_statement_type; 189 190 typedef struct 191 { 192 lang_statement_header_type header; 193 unsigned int type; 194 union etree_union *exp; 195 bfd_vma value; 196 asection *output_section; 197 bfd_vma output_offset; 198 } lang_data_statement_type; 199 200 /* Generate a reloc in the output file. */ 201 202 typedef struct 203 { 204 lang_statement_header_type header; 205 206 /* Reloc to generate. */ 207 bfd_reloc_code_real_type reloc; 208 209 /* Reloc howto structure. */ 210 reloc_howto_type *howto; 211 212 /* Section to generate reloc against. 213 Exactly one of section and name must be NULL. */ 214 asection *section; 215 216 /* Name of symbol to generate reloc against. 217 Exactly one of section and name must be NULL. */ 218 const char *name; 219 220 /* Expression for addend. */ 221 union etree_union *addend_exp; 222 223 /* Resolved addend. */ 224 bfd_vma addend_value; 225 226 /* Output section where reloc should be performed. */ 227 asection *output_section; 228 229 /* Offset within output section. */ 230 bfd_vma output_offset; 231 } lang_reloc_statement_type; 232 233 struct lang_input_statement_flags 234 { 235 /* 1 means this file was specified in a -l option. */ 236 unsigned int maybe_archive : 1; 237 238 /* 1 means search a set of directories for this file. */ 239 unsigned int search_dirs : 1; 240 241 /* 1 means this was found when processing a script in the sysroot. */ 242 unsigned int sysrooted : 1; 243 244 /* 1 means this is base file of incremental load. 245 Do not load this file's text or data. 246 Also default text_start to after this file's bss. */ 247 unsigned int just_syms : 1; 248 249 /* Whether to search for this entry as a dynamic archive. */ 250 unsigned int dynamic : 1; 251 252 /* Set if a DT_NEEDED tag should be added not just for the dynamic library 253 explicitly given by this entry but also for any dynamic libraries in 254 this entry's needed list. */ 255 unsigned int add_DT_NEEDED_for_dynamic : 1; 256 257 /* Set if this entry should cause a DT_NEEDED tag only when some 258 regular file references its symbols (ie. --as-needed is in effect). */ 259 unsigned int add_DT_NEEDED_for_regular : 1; 260 261 /* Whether to include the entire contents of an archive. */ 262 unsigned int whole_archive : 1; 263 264 /* Set when bfd opening is successful. */ 265 unsigned int loaded : 1; 266 267 unsigned int real : 1; 268 269 /* Set if the file does not exist. */ 270 unsigned int missing_file : 1; 271 272 #ifdef ENABLE_PLUGINS 273 /* Set if the file was claimed by a plugin. */ 274 unsigned int claimed : 1; 275 276 /* Set if the file was claimed from an archive. */ 277 unsigned int claim_archive : 1; 278 279 /* Set if reloading an --as-needed lib. */ 280 unsigned int reload : 1; 281 #endif /* ENABLE_PLUGINS */ 282 }; 283 284 typedef struct lang_input_statement_struct 285 { 286 lang_statement_header_type header; 287 /* Name of this file. */ 288 const char *filename; 289 /* Name to use for the symbol giving address of text start. 290 Usually the same as filename, but for a file spec'd with 291 -l this is the -l switch itself rather than the filename. */ 292 const char *local_sym_name; 293 294 bfd *the_bfd; 295 296 struct flag_info *section_flag_list; 297 298 /* Point to the next file - whatever it is, wanders up and down 299 archives */ 300 union lang_statement_union *next; 301 302 /* Point to the next file, but skips archive contents. */ 303 union lang_statement_union *next_real_file; 304 305 const char *target; 306 307 struct lang_input_statement_flags flags; 308 } lang_input_statement_type; 309 310 typedef struct 311 { 312 lang_statement_header_type header; 313 asection *section; 314 } lang_input_section_type; 315 316 typedef struct lang_wild_statement_struct lang_wild_statement_type; 317 318 typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *, 319 asection *, struct flag_info *, 320 lang_input_statement_type *, void *); 321 322 typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *, 323 lang_input_statement_type *, 324 callback_t callback, 325 void *data); 326 327 typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *, 328 bfd *, const asection *); 329 330 /* Binary search tree structure to efficiently sort sections by 331 name. */ 332 typedef struct lang_section_bst 333 { 334 asection *section; 335 struct lang_section_bst *left; 336 struct lang_section_bst *right; 337 } lang_section_bst_type; 338 339 struct lang_wild_statement_struct 340 { 341 lang_statement_header_type header; 342 const char *filename; 343 bfd_boolean filenames_sorted; 344 struct wildcard_list *section_list; 345 bfd_boolean keep_sections; 346 lang_statement_list_type children; 347 348 walk_wild_section_handler_t walk_wild_section_handler; 349 struct wildcard_list *handler_data[4]; 350 lang_section_bst_type *tree; 351 struct flag_info *section_flag_list; 352 }; 353 354 typedef struct lang_address_statement_struct 355 { 356 lang_statement_header_type header; 357 const char *section_name; 358 union etree_union *address; 359 const segment_type *segment; 360 } lang_address_statement_type; 361 362 typedef struct 363 { 364 lang_statement_header_type header; 365 bfd_vma output_offset; 366 bfd_size_type size; 367 asection *output_section; 368 fill_type *fill; 369 } lang_padding_statement_type; 370 371 /* A group statement collects a set of libraries together. The 372 libraries are searched multiple times, until no new undefined 373 symbols are found. The effect is to search a group of libraries as 374 though they were a single library. */ 375 376 typedef struct 377 { 378 lang_statement_header_type header; 379 lang_statement_list_type children; 380 } lang_group_statement_type; 381 382 typedef struct 383 { 384 lang_statement_header_type header; 385 const char *where; 386 bfd_boolean is_before; 387 } lang_insert_statement_type; 388 389 typedef union lang_statement_union 390 { 391 lang_statement_header_type header; 392 lang_wild_statement_type wild_statement; 393 lang_data_statement_type data_statement; 394 lang_reloc_statement_type reloc_statement; 395 lang_address_statement_type address_statement; 396 lang_output_section_statement_type output_section_statement; 397 lang_assignment_statement_type assignment_statement; 398 lang_input_statement_type input_statement; 399 lang_target_statement_type target_statement; 400 lang_output_statement_type output_statement; 401 lang_input_section_type input_section; 402 lang_common_statement_type common_statement; 403 lang_object_symbols_statement_type object_symbols_statement; 404 lang_fill_statement_type fill_statement; 405 lang_padding_statement_type padding_statement; 406 lang_group_statement_type group_statement; 407 lang_insert_statement_type insert_statement; 408 } lang_statement_union_type; 409 410 /* This structure holds information about a program header, from the 411 PHDRS command in the linker script. */ 412 413 struct lang_phdr 414 { 415 struct lang_phdr *next; 416 const char *name; 417 unsigned long type; 418 bfd_boolean filehdr; 419 bfd_boolean phdrs; 420 etree_type *at; 421 etree_type *flags; 422 }; 423 424 /* This structure is used to hold a list of sections which may not 425 cross reference each other. */ 426 427 typedef struct lang_nocrossref 428 { 429 struct lang_nocrossref *next; 430 const char *name; 431 } lang_nocrossref_type; 432 433 /* The list of nocrossref lists. */ 434 435 struct lang_nocrossrefs 436 { 437 struct lang_nocrossrefs *next; 438 lang_nocrossref_type *list; 439 }; 440 441 /* This structure is used to hold a list of input section names which 442 will not match an output section in the linker script. */ 443 444 struct unique_sections 445 { 446 struct unique_sections *next; 447 const char *name; 448 }; 449 450 /* This structure records symbols for which we need to keep track of 451 definedness for use in the DEFINED () test. */ 452 453 struct lang_definedness_hash_entry 454 { 455 struct bfd_hash_entry root; 456 int iteration; 457 }; 458 459 /* Used by place_orphan to keep track of orphan sections and statements. */ 460 461 struct orphan_save 462 { 463 const char *name; 464 flagword flags; 465 lang_output_section_statement_type *os; 466 asection **section; 467 lang_statement_union_type **stmt; 468 lang_output_section_statement_type **os_tail; 469 }; 470 471 extern struct lang_phdr *lang_phdr_list; 472 extern struct lang_nocrossrefs *nocrossref_list; 473 extern const char *output_target; 474 extern lang_output_section_statement_type *abs_output_section; 475 extern lang_statement_list_type lang_output_section_statement; 476 extern struct lang_input_statement_flags input_flags; 477 extern bfd_boolean lang_has_input_file; 478 extern etree_type *base; 479 extern lang_statement_list_type *stat_ptr; 480 extern bfd_boolean delete_output_file_on_failure; 481 482 extern struct bfd_sym_chain entry_symbol; 483 extern const char *entry_section; 484 extern bfd_boolean entry_from_cmdline; 485 extern lang_statement_list_type file_chain; 486 extern lang_statement_list_type input_file_chain; 487 488 extern int lang_statement_iteration; 489 490 extern void lang_init 491 (void); 492 extern void lang_finish 493 (void); 494 extern lang_memory_region_type * lang_memory_region_lookup 495 (const char * const, bfd_boolean); 496 extern void lang_memory_region_alias 497 (const char *, const char *); 498 extern void lang_map 499 (void); 500 extern void lang_set_flags 501 (lang_memory_region_type *, const char *, int); 502 extern void lang_add_output 503 (const char *, int from_script); 504 extern lang_output_section_statement_type *lang_enter_output_section_statement 505 (const char *output_section_statement_name, 506 etree_type *address_exp, 507 enum section_type sectype, 508 etree_type *align, 509 etree_type *subalign, 510 etree_type *, int); 511 extern void lang_final 512 (void); 513 extern void lang_relax_sections 514 (bfd_boolean); 515 extern void lang_process 516 (void); 517 extern void lang_section_start 518 (const char *, union etree_union *, const segment_type *); 519 extern void lang_add_entry 520 (const char *, bfd_boolean); 521 extern void lang_default_entry 522 (const char *); 523 extern void lang_add_target 524 (const char *); 525 extern void lang_add_wild 526 (struct wildcard_spec *, struct wildcard_list *, bfd_boolean); 527 extern void lang_add_map 528 (const char *); 529 extern void lang_add_fill 530 (fill_type *); 531 extern lang_assignment_statement_type *lang_add_assignment 532 (union etree_union *); 533 extern void lang_add_attribute 534 (enum statement_enum); 535 extern void lang_startup 536 (const char *); 537 extern void lang_float 538 (bfd_boolean); 539 extern void lang_leave_output_section_statement 540 (fill_type *, const char *, lang_output_section_phdr_list *, 541 const char *); 542 extern void lang_statement_append 543 (lang_statement_list_type *, lang_statement_union_type *, 544 lang_statement_union_type **); 545 extern void lang_for_each_input_file 546 (void (*dothis) (lang_input_statement_type *)); 547 extern void lang_for_each_file 548 (void (*dothis) (lang_input_statement_type *)); 549 extern void lang_reset_memory_regions 550 (void); 551 extern void lang_do_assignments 552 (lang_phase_type); 553 extern asection *section_for_dot 554 (void); 555 556 #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) \ 561 562 #define lang_output_section_find(NAME) \ 563 lang_output_section_statement_lookup (NAME, 0, FALSE) 564 565 extern void lang_process 566 (void); 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 578 (const char *); 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 592 (void); 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 603 (size_t); 604 extern void strip_excluded_output_sections 605 (void); 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 613 (const char *, int); 614 extern void lang_enter_group 615 (void); 616 extern void lang_leave_group 617 (void); 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 *, 623 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 629 (const char *); 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 *); 635 636 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 648 (const char *); 649 extern const char *lang_get_output_target 650 (void); 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 *); 655 656 extern void add_excluded_libs (const char *); 657 extern bfd_boolean load_symbols 658 (lang_input_statement_type *, lang_statement_list_type *); 659 660 extern bfd_boolean 661 ldlang_override_segment_assignment 662 (struct bfd_link_info *, bfd *, asection *, asection *, bfd_boolean); 663 664 extern void 665 lang_ld_feature (char *); 666 667 #endif 668