ld/ldlang.h

   1 /* ldlang.h - linker command language support
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
   3    2001, 2002, 2003, 2004
   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, 59 Temple Place - Suite 330, Boston, MA
  21    02111-1307, 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_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   bfd_size_type old_length;
  58   flagword flags;
  59   flagword not_flags;
  60   bfd_boolean had_full_message;
  61 } lang_memory_region_type;
  62
  63 typedef 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
  88 typedef struct
  89 {
  90   lang_statement_header_type header;
  91   union etree_union *exp;
  92 } lang_assignment_statement_type;
  93
  94 typedef struct lang_target_statement_struct
  95 {
  96   lang_statement_header_type header;
  97   const char *target;
  98 } lang_target_statement_type;
  99
 100 typedef 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
 108 enum section_type
 109 {
 110   normal_section,
 111   dsect_section,
 112   copy_section,
 113   noload_section,
 114   info_section,
 115   overlay_section
 116 };
 117
 118 /* This structure holds a list of program headers describing
 119    segments in which this section should be placed.  */
 120
 121 typedef struct lang_output_section_phdr_list
 122 {
 123   struct lang_output_section_phdr_list *next;
 124   const char *name;
 125   bfd_boolean used;
 126 } lang_output_section_phdr_list;
 127
 128 typedef struct lang_output_section_statement_struct
 129 {
 130   lang_statement_header_type header;
 131   union etree_union *addr_tree;
 132   lang_statement_list_type children;
 133   const char *memspec;
 134   struct lang_output_section_statement_struct *next;
 135   const char *name;
 136
 137   int processed;
 138
 139   asection *bfd_section;
 140   flagword flags;               /* Or together of all input sections.  */
 141   enum section_type sectype;
 142   lang_memory_region_type *region;
 143   lang_memory_region_type *lma_region;
 144   size_t block_value;
 145   fill_type *fill;
 146
 147   int subsection_alignment;     /* Alignment of components.  */
 148   int section_alignment;        /* Alignment of start of section.  */
 149   int constraint;
 150   bfd_boolean all_input_readonly;
 151
 152   union etree_union *load_base;
 153
 154   /* If non-null, an expression to evaluate after setting the section's
 155      size.  The expression is evaluated inside REGION (above) with '.'
 156      set to the end of the section.  Used in the last overlay section
 157      to move '.' past all the overlaid sections.  */
 158   union etree_union *update_dot_tree;
 159
 160   lang_output_section_phdr_list *phdrs;
 161 } lang_output_section_statement_type;
 162
 163 typedef struct
 164 {
 165   lang_statement_header_type header;
 166 } lang_common_statement_type;
 167
 168 typedef struct
 169 {
 170   lang_statement_header_type header;
 171 } lang_object_symbols_statement_type;
 172
 173 typedef 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
 181 typedef 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_vma;
 189 } lang_data_statement_type;
 190
 191 /* Generate a reloc in the output file.  */
 192
 193 typedef 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   /* VMA within output section.  */
 221   bfd_vma output_vma;
 222 } lang_reloc_statement_type;
 223
 224 typedef 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   bfd_boolean closed;
 237   file_ptr passive_position;
 238
 239   /* Symbol table of the file.  */
 240   asymbol **asymbols;
 241   unsigned int symbol_count;
 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   bfd_boolean is_archive;
 251
 252   /* 1 means search a set of directories for this file.  */
 253   bfd_boolean search_dirs_flag;
 254
 255   /* 1 means this was found in a search directory marked as sysrooted,
 256      if search_dirs_flag is false, otherwise, that it should be
 257      searched in ld_sysroot before any other location, as long as it
 258      starts with a slash.  */
 259   bfd_boolean sysrooted;
 260
 261   /* 1 means this is base file of incremental load.
 262      Do not load this file's text or data.
 263      Also default text_start to after this file's bss.  */
 264   bfd_boolean just_syms_flag;
 265
 266   /* Whether to search for this entry as a dynamic archive.  */
 267   bfd_boolean dynamic;
 268
 269   /* Whether DT_NEEDED tags should be added for dynamic libraries in
 270      DT_NEEDED tags from this entry.  */
 271   bfd_boolean add_needed;
 272
 273   /* Whether this entry should cause a DT_NEEDED tag only when
 274      satisfying references from regular files, or always.  */
 275   bfd_boolean as_needed;
 276
 277   /* Whether to include the entire contents of an archive.  */
 278   bfd_boolean whole_archive;
 279
 280   bfd_boolean loaded;
 281
 282   const char *target;
 283   bfd_boolean real;
 284 } lang_input_statement_type;
 285
 286 typedef struct
 287 {
 288   lang_statement_header_type header;
 289   asection *section;
 290   lang_input_statement_type *ifile;
 291
 292 } lang_input_section_type;
 293
 294 typedef struct
 295 {
 296   lang_statement_header_type header;
 297   asection *section;
 298   union lang_statement_union *file;
 299 } lang_afile_asection_pair_statement_type;
 300
 301 typedef struct lang_wild_statement_struct
 302 {
 303   lang_statement_header_type header;
 304   const char *filename;
 305   bfd_boolean filenames_sorted;
 306   struct wildcard_list *section_list;
 307   bfd_boolean keep_sections;
 308   lang_statement_list_type children;
 309 } lang_wild_statement_type;
 310
 311 typedef struct lang_address_statement_struct
 312 {
 313   lang_statement_header_type header;
 314   const char *section_name;
 315   union etree_union *address;
 316   const segment_type *segment;
 317 } lang_address_statement_type;
 318
 319 typedef struct
 320 {
 321   lang_statement_header_type header;
 322   bfd_vma output_offset;
 323   size_t size;
 324   asection *output_section;
 325   fill_type *fill;
 326 } lang_padding_statement_type;
 327
 328 /* A group statement collects a set of libraries together.  The
 329    libraries are searched multiple times, until no new undefined
 330    symbols are found.  The effect is to search a group of libraries as
 331    though they were a single library.  */
 332
 333 typedef struct
 334 {
 335   lang_statement_header_type header;
 336   lang_statement_list_type children;
 337 } lang_group_statement_type;
 338
 339 typedef union lang_statement_union
 340 {
 341   lang_statement_header_type header;
 342   lang_wild_statement_type wild_statement;
 343   lang_data_statement_type data_statement;
 344   lang_reloc_statement_type reloc_statement;
 345   lang_address_statement_type address_statement;
 346   lang_output_section_statement_type output_section_statement;
 347   lang_afile_asection_pair_statement_type afile_asection_pair_statement;
 348   lang_assignment_statement_type assignment_statement;
 349   lang_input_statement_type input_statement;
 350   lang_target_statement_type target_statement;
 351   lang_output_statement_type output_statement;
 352   lang_input_section_type input_section;
 353   lang_common_statement_type common_statement;
 354   lang_object_symbols_statement_type object_symbols_statement;
 355   lang_fill_statement_type fill_statement;
 356   lang_padding_statement_type padding_statement;
 357   lang_group_statement_type group_statement;
 358 } lang_statement_union_type;
 359
 360 /* This structure holds information about a program header, from the
 361    PHDRS command in the linker script.  */
 362
 363 struct lang_phdr
 364 {
 365   struct lang_phdr *next;
 366   const char *name;
 367   unsigned long type;
 368   bfd_boolean filehdr;
 369   bfd_boolean phdrs;
 370   etree_type *at;
 371   etree_type *flags;
 372 };
 373
 374 /* This structure is used to hold a list of sections which may not
 375    cross reference each other.  */
 376
 377 typedef struct lang_nocrossref
 378 {
 379   struct lang_nocrossref *next;
 380   const char *name;
 381 } lang_nocrossref_type;
 382
 383 /* The list of nocrossref lists.  */
 384
 385 struct lang_nocrossrefs
 386 {
 387   struct lang_nocrossrefs *next;
 388   lang_nocrossref_type *list;
 389 };
 390
 391 extern struct lang_nocrossrefs *nocrossref_list;
 392
 393 /* This structure is used to hold a list of input section names which
 394    will not match an output section in the linker script.  */
 395
 396 struct unique_sections
 397 {
 398   struct unique_sections *next;
 399   const char *name;
 400 };
 401
 402 /* This structure records symbols for which we need to keep track of
 403    definedness for use in the DEFINED () test.  */
 404
 405 struct lang_definedness_hash_entry
 406 {
 407   struct bfd_hash_entry root;
 408   int iteration;
 409 };
 410
 411 /* Used by place_orphan to keep track of orphan sections and statements.  */
 412
 413 struct orphan_save {
 414   const char *name;
 415   flagword flags;
 416   lang_output_section_statement_type *os;
 417   asection **section;
 418   lang_statement_union_type **stmt;
 419   lang_output_section_statement_type **os_tail;
 420 };
 421
 422 extern struct unique_sections *unique_section_list;
 423
 424 extern lang_output_section_statement_type *abs_output_section;
 425 extern lang_statement_list_type lang_output_section_statement;
 426 extern bfd_boolean lang_has_input_file;
 427 extern etree_type *base;
 428 extern lang_statement_list_type *stat_ptr;
 429 extern bfd_boolean delete_output_file_on_failure;
 430
 431 extern struct bfd_sym_chain entry_symbol;
 432 extern const char *entry_section;
 433 extern bfd_boolean entry_from_cmdline;
 434 extern lang_statement_list_type file_chain;
 435
 436 extern int lang_statement_iteration;
 437
 438 extern void lang_init
 439   (void);
 440 extern lang_memory_region_type *lang_memory_region_lookup
 441   (const char *const, bfd_boolean);
 442 extern lang_memory_region_type *lang_memory_region_default
 443   (asection *);
 444 extern void lang_map
 445   (void);
 446 extern void lang_set_flags
 447   (lang_memory_region_type *, const char *, int);
 448 extern void lang_add_output
 449   (const char *, int from_script);
 450 extern lang_output_section_statement_type *lang_enter_output_section_statement
 451   (const char *output_section_statement_name,
 452    etree_type *address_exp,
 453    enum section_type sectype,
 454    etree_type *align,
 455    etree_type *subalign,
 456    etree_type *, int);
 457 extern void lang_final
 458   (void);
 459 extern void lang_process
 460   (void);
 461 extern void lang_section_start
 462   (const char *, union etree_union *, const segment_type *);
 463 extern void lang_add_entry
 464   (const char *, bfd_boolean);
 465 extern void lang_add_target
 466   (const char *);
 467 extern void lang_add_wild
 468   (struct wildcard_spec *, struct wildcard_list *, bfd_boolean);
 469 extern void lang_add_map
 470   (const char *);
 471 extern void lang_add_fill
 472   (fill_type *);
 473 extern lang_assignment_statement_type *lang_add_assignment
 474   (union etree_union *);
 475 extern void lang_add_attribute
 476   (enum statement_enum);
 477 extern void lang_startup
 478   (const char *);
 479 extern void lang_float
 480   (bfd_boolean);
 481 extern void lang_leave_output_section_statement
 482   (fill_type *, const char *, lang_output_section_phdr_list *,
 483    const char *);
 484 extern void lang_abs_symbol_at_end_of
 485   (const char *, const char *);
 486 extern void lang_abs_symbol_at_beginning_of
 487   (const char *, const char *);
 488 extern void lang_statement_append
 489   (lang_statement_list_type *, lang_statement_union_type *,
 490    lang_statement_union_type **);
 491 extern void lang_for_each_input_file
 492   (void (*dothis) (lang_input_statement_type *));
 493 extern void lang_for_each_file
 494   (void (*dothis) (lang_input_statement_type *));
 495 extern void lang_reset_memory_regions
 496   (void);
 497 extern void lang_do_assignments
 498   (lang_statement_union_type *, lang_output_section_statement_type *,
 499    fill_type *, bfd_vma);
 500
 501 #define LANG_FOR_EACH_INPUT_STATEMENT(statement)                        \
 502   lang_input_statement_type *statement;                                 \
 503   for (statement = (lang_input_statement_type *) file_chain.head;       \
 504        statement != (lang_input_statement_type *) NULL;                 \
 505        statement = (lang_input_statement_type *) statement->next)       \
 506
 507 extern void lang_process
 508   (void);
 509 extern void ldlang_add_file
 510   (lang_input_statement_type *);
 511 extern lang_output_section_statement_type *lang_output_section_find
 512   (const char * const);
 513 extern lang_output_section_statement_type *lang_output_section_find_by_flags
 514   (const asection *, lang_output_section_statement_type **exact);
 515 extern lang_output_section_statement_type *lang_insert_orphan
 516   (lang_input_statement_type *, asection *, const char *,
 517    lang_output_section_statement_type *, struct orphan_save *,
 518    etree_type *, lang_statement_list_type *);
 519 extern lang_input_statement_type *lang_add_input_file
 520   (const char *, lang_input_file_enum_type, const char *);
 521 extern void lang_add_keepsyms_file
 522   (const char *);
 523 extern lang_output_section_statement_type *
 524   lang_output_section_statement_lookup
 525   (const char *const);
 526 extern void ldlang_add_undef
 527   (const char *const);
 528 extern void lang_add_output_format
 529   (const char *, const char *, const char *, int);
 530 extern void lang_list_init
 531   (lang_statement_list_type *);
 532 extern void lang_add_data
 533   (int type, union etree_union *);
 534 extern void lang_add_reloc
 535   (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *,
 536    union etree_union *);
 537 extern void lang_for_each_statement
 538   (void (*) (lang_statement_union_type *));
 539 extern void *stat_alloc
 540   (size_t);
 541 extern void dprint_statement
 542   (lang_statement_union_type *, int);
 543 extern bfd_vma lang_size_sections
 544   (lang_statement_union_type *, lang_output_section_statement_type *,
 545    lang_statement_union_type **, fill_type *, bfd_vma, bfd_boolean *,
 546    bfd_boolean);
 547 extern void lang_enter_group
 548   (void);
 549 extern void lang_leave_group
 550   (void);
 551 extern void lang_add_section
 552   (lang_statement_list_type *, asection *,
 553    lang_output_section_statement_type *, lang_input_statement_type *);
 554 extern void lang_new_phdr
 555   (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *,
 556    etree_type *);
 557 extern void lang_add_nocrossref
 558   (lang_nocrossref_type *);
 559 extern void lang_enter_overlay
 560   (etree_type *, etree_type *);
 561 extern void lang_enter_overlay_section
 562   (const char *);
 563 extern void lang_leave_overlay_section
 564   (fill_type *, lang_output_section_phdr_list *);
 565 extern void lang_leave_overlay
 566   (etree_type *, int, fill_type *, const char *,
 567    lang_output_section_phdr_list *, const char *);
 568
 569 extern struct bfd_elf_version_tree *lang_elf_version_info;
 570
 571 extern struct bfd_elf_version_expr *lang_new_vers_pattern
 572   (struct bfd_elf_version_expr *, const char *, const char *);
 573 extern struct bfd_elf_version_tree *lang_new_vers_node
 574   (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *);
 575 extern struct bfd_elf_version_deps *lang_add_vers_depend
 576   (struct bfd_elf_version_deps *, const char *);
 577 extern void lang_register_vers_node
 578   (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *);
 579 bfd_boolean unique_section_p
 580   (const asection *);
 581 extern void lang_add_unique
 582   (const char *);
 583 extern const char *lang_get_output_target
 584   (void);
 585 extern void lang_track_definedness (const char *);
 586 extern int lang_symbol_definition_iteration (const char *);
 587 extern void lang_update_definedness
 588   (const char *, struct bfd_link_hash_entry *);
 589
 590 extern void add_excluded_libs (const char *);
 591
 592 #endif