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
   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 typedef enum {
  27   lang_input_file_is_l_enum,
  28   lang_input_file_is_symbols_only_enum,
  29   lang_input_file_is_marker_enum,
  30   lang_input_file_is_fake_enum,
  31   lang_input_file_is_search_file_enum,
  32   lang_input_file_is_file_enum
  33 } lang_input_file_enum_type;
  34
  35 struct _fill_type {
  36   size_t size;
  37   unsigned char data[1];
  38 };
  39
  40 typedef struct statement_list {
  41   union lang_statement_union *head;
  42   union lang_statement_union **tail;
  43 } lang_statement_list_type;
  44
  45 typedef struct memory_region_struct {
  46   char *name;
  47   struct memory_region_struct *next;
  48   bfd_vma origin;
  49   bfd_size_type length;
  50   bfd_vma current;
  51   bfd_size_type old_length;
  52   flagword flags;
  53   flagword not_flags;
  54   bfd_boolean had_full_message;
  55 } lang_memory_region_type;
  56
  57 typedef struct lang_statement_header_struct {
  58   union lang_statement_union *next;
  59   enum statement_enum {
  60     lang_output_section_statement_enum,
  61     lang_assignment_statement_enum,
  62     lang_input_statement_enum,
  63     lang_address_statement_enum,
  64     lang_wild_statement_enum,
  65     lang_input_section_enum,
  66     lang_object_symbols_statement_enum,
  67     lang_fill_statement_enum,
  68     lang_data_statement_enum,
  69     lang_reloc_statement_enum,
  70     lang_target_statement_enum,
  71     lang_output_statement_enum,
  72     lang_padding_statement_enum,
  73     lang_group_statement_enum,
  74
  75     lang_afile_asection_pair_statement_enum,
  76     lang_constructors_statement_enum
  77   } type;
  78 } lang_statement_header_type;
  79
  80 typedef struct {
  81   lang_statement_header_type header;
  82   union etree_union *exp;
  83 } lang_assignment_statement_type;
  84
  85 typedef struct lang_target_statement_struct {
  86   lang_statement_header_type header;
  87   const char *target;
  88 } lang_target_statement_type;
  89
  90 typedef struct lang_output_statement_struct {
  91   lang_statement_header_type header;
  92   const char *name;
  93 } lang_output_statement_type;
  94
  95 /* Section types specified in a linker script.  */
  96
  97 enum section_type {
  98   normal_section,
  99   dsect_section,
 100   copy_section,
 101   noload_section,
 102   info_section,
 103   overlay_section
 104 };
 105
 106 /* This structure holds a list of program headers describing segments
 107    in which this section should be placed.  */
 108
 109 struct lang_output_section_phdr_list {
 110   struct lang_output_section_phdr_list *next;
 111   const char *name;
 112   bfd_boolean used;
 113 };
 114
 115 typedef struct lang_output_section_statement_struct {
 116   lang_statement_header_type header;
 117   union etree_union *addr_tree;
 118   lang_statement_list_type children;
 119   const char *memspec;
 120   union lang_statement_union *next;
 121   const char *name;
 122
 123   bfd_boolean processed;
 124
 125   asection *bfd_section;
 126   flagword flags;               /* Or together of all input sections */
 127   enum section_type sectype;
 128   struct memory_region_struct *region;
 129   struct memory_region_struct *lma_region;
 130   size_t block_value;
 131   fill_type *fill;
 132
 133   int subsection_alignment;     /* alignment of components */
 134   int section_alignment;        /* alignment of start of section */
 135
 136   union etree_union *load_base;
 137
 138   /* If non-null, an expression to evaluate after setting the section's
 139      size.  The expression is evaluated inside REGION (above) with '.'
 140      set to the end of the section.  Used in the last overlay section
 141      to move '.' past all the overlaid sections.  */
 142   union etree_union *update_dot_tree;
 143
 144   struct lang_output_section_phdr_list *phdrs;
 145 } lang_output_section_statement_type;
 146
 147 typedef struct {
 148   lang_statement_header_type header;
 149 } lang_common_statement_type;
 150
 151 typedef struct {
 152   lang_statement_header_type header;
 153 } lang_object_symbols_statement_type;
 154
 155 typedef struct {
 156   lang_statement_header_type header;
 157   fill_type *fill;
 158   int size;
 159   asection *output_section;
 160 } lang_fill_statement_type;
 161
 162 typedef struct {
 163   lang_statement_header_type header;
 164   unsigned int type;
 165   union etree_union *exp;
 166   bfd_vma value;
 167   asection *output_section;
 168   bfd_vma output_vma;
 169 } lang_data_statement_type;
 170
 171 /* Generate a reloc in the output file.  */
 172
 173 typedef struct {
 174   lang_statement_header_type header;
 175
 176   /* Reloc to generate.  */
 177   bfd_reloc_code_real_type reloc;
 178
 179   /* Reloc howto structure.  */
 180   reloc_howto_type *howto;
 181
 182   /* Section to generate reloc against.  Exactly one of section and
 183      name must be NULL.  */
 184   asection *section;
 185
 186   /* Name of symbol to generate reloc against.  Exactly one of section
 187      and name must be NULL.  */
 188   const char *name;
 189
 190   /* Expression for addend.  */
 191   union etree_union *addend_exp;
 192
 193   /* Resolved addend.  */
 194   bfd_vma addend_value;
 195
 196   /* Output section where reloc should be performed.  */
 197   asection *output_section;
 198
 199   /* VMA within output section.  */
 200   bfd_vma output_vma;
 201 } lang_reloc_statement_type;
 202
 203 typedef struct lang_input_statement_struct {
 204   lang_statement_header_type header;
 205   /* Name of this file.  */
 206   const char *filename;
 207   /* Name to use for the symbol giving address of text start */
 208   /* Usually the same as filename, but for a file spec'd with -l
 209      this is the -l switch itself rather than the filename.  */
 210   const char *local_sym_name;
 211
 212   bfd *the_bfd;
 213
 214   bfd_boolean closed;
 215   file_ptr passive_position;
 216
 217   /* Symbol table of the file.  */
 218   asymbol **asymbols;
 219   unsigned int symbol_count;
 220
 221   /* Point to the next file - whatever it is, wanders up and down
 222      archives */
 223
 224   union lang_statement_union *next;
 225   /* Point to the next file, but skips archive contents */
 226   union lang_statement_union *next_real_file;
 227
 228   bfd_boolean is_archive;
 229
 230   /* 1 means search a set of directories for this file.  */
 231   bfd_boolean search_dirs_flag;
 232
 233   /* 1 means this is base file of incremental load.
 234      Do not load this file's text or data.
 235      Also default text_start to after this file's bss.  */
 236
 237   bfd_boolean just_syms_flag;
 238
 239   /* Whether to search for this entry as a dynamic archive.  */
 240   bfd_boolean dynamic;
 241
 242   /* Whether to include the entire contents of an archive.  */
 243   bfd_boolean whole_archive;
 244
 245   bfd_boolean loaded;
 246
 247 #if 0
 248   unsigned int globals_in_this_file;
 249 #endif
 250   const char *target;
 251   bfd_boolean real;
 252 } lang_input_statement_type;
 253
 254 typedef struct {
 255   lang_statement_header_type header;
 256   asection *section;
 257   lang_input_statement_type *ifile;
 258
 259 } lang_input_section_type;
 260
 261 typedef struct {
 262   lang_statement_header_type header;
 263   asection *section;
 264   union lang_statement_union *file;
 265 } lang_afile_asection_pair_statement_type;
 266
 267 typedef struct lang_wild_statement_struct {
 268   lang_statement_header_type header;
 269   const char *filename;
 270   bfd_boolean filenames_sorted;
 271   struct wildcard_list *section_list;
 272   bfd_boolean keep_sections;
 273   lang_statement_list_type children;
 274 } lang_wild_statement_type;
 275
 276 typedef struct lang_address_statement_struct {
 277   lang_statement_header_type header;
 278   const char *section_name;
 279   union etree_union *address;
 280 } lang_address_statement_type;
 281
 282 typedef struct {
 283   lang_statement_header_type header;
 284   bfd_vma output_offset;
 285   size_t size;
 286   asection *output_section;
 287   fill_type *fill;
 288 } lang_padding_statement_type;
 289
 290 /* A group statement collects a set of libraries together.  The
 291    libraries are searched multiple times, until no new undefined
 292    symbols are found.  The effect is to search a group of libraries as
 293    though they were a single library.  */
 294
 295 typedef struct {
 296   lang_statement_header_type header;
 297   lang_statement_list_type children;
 298 } lang_group_statement_type;
 299
 300 typedef union lang_statement_union {
 301   lang_statement_header_type header;
 302   lang_wild_statement_type wild_statement;
 303   lang_data_statement_type data_statement;
 304   lang_reloc_statement_type reloc_statement;
 305   lang_address_statement_type address_statement;
 306   lang_output_section_statement_type output_section_statement;
 307   lang_afile_asection_pair_statement_type afile_asection_pair_statement;
 308   lang_assignment_statement_type assignment_statement;
 309   lang_input_statement_type input_statement;
 310   lang_target_statement_type target_statement;
 311   lang_output_statement_type output_statement;
 312   lang_input_section_type input_section;
 313   lang_common_statement_type common_statement;
 314   lang_object_symbols_statement_type object_symbols_statement;
 315   lang_fill_statement_type fill_statement;
 316   lang_padding_statement_type padding_statement;
 317   lang_group_statement_type group_statement;
 318 } lang_statement_union_type;
 319
 320 /* This structure holds information about a program header, from the
 321    PHDRS command in the linker script.  */
 322
 323 struct lang_phdr {
 324   struct lang_phdr *next;
 325   const char *name;
 326   unsigned long type;
 327   bfd_boolean filehdr;
 328   bfd_boolean phdrs;
 329   etree_type *at;
 330   etree_type *flags;
 331 };
 332
 333 /* This structure is used to hold a list of sections which may not
 334    cross reference each other.  */
 335
 336 struct lang_nocrossref {
 337   struct lang_nocrossref *next;
 338   const char *name;
 339 };
 340
 341 /* The list of nocrossref lists.  */
 342
 343 struct lang_nocrossrefs {
 344   struct lang_nocrossrefs *next;
 345   struct lang_nocrossref *list;
 346 };
 347
 348 extern struct lang_nocrossrefs *nocrossref_list;
 349
 350 /* This structure is used to hold a list of input section names which
 351    will not match an output section in the linker script.  */
 352
 353 struct unique_sections {
 354   struct unique_sections *next;
 355   const char *name;
 356 };
 357
 358 extern struct unique_sections *unique_section_list;
 359
 360 extern lang_output_section_statement_type *abs_output_section;
 361 extern lang_statement_list_type lang_output_section_statement;
 362 extern bfd_boolean lang_has_input_file;
 363 extern etree_type *base;
 364 extern lang_statement_list_type *stat_ptr;
 365 extern bfd_boolean delete_output_file_on_failure;
 366
 367 extern struct bfd_sym_chain entry_symbol;
 368 extern const char *entry_section;
 369 extern bfd_boolean entry_from_cmdline;
 370 extern lang_statement_list_type file_chain;
 371
 372 extern void lang_init PARAMS ((void));
 373 extern struct memory_region_struct *lang_memory_region_lookup
 374   PARAMS ((const char *const));
 375 extern struct memory_region_struct *lang_memory_region_default
 376   PARAMS ((asection *));
 377 extern void lang_map PARAMS ((void));
 378 extern void lang_set_flags PARAMS ((lang_memory_region_type *, const char *,
 379                                     int));
 380 extern void lang_add_output PARAMS ((const char *, int from_script));
 381 extern lang_output_section_statement_type *lang_enter_output_section_statement
 382   PARAMS ((const char *output_section_statement_name,
 383            etree_type * address_exp,
 384            enum section_type sectype,
 385            bfd_vma block_value,
 386            etree_type *align,
 387            etree_type *subalign,
 388            etree_type *));
 389 extern void lang_final PARAMS ((void));
 390 extern void lang_process PARAMS ((void));
 391 extern void lang_section_start PARAMS ((const char *, union etree_union *));
 392 extern void lang_add_entry PARAMS ((const char *, bfd_boolean));
 393 extern void lang_add_target PARAMS ((const char *));
 394 extern void lang_add_wild
 395   PARAMS ((struct wildcard_spec *, struct wildcard_list *, bfd_boolean));
 396 extern void lang_add_map PARAMS ((const char *));
 397 extern void lang_add_fill PARAMS ((fill_type *));
 398 extern lang_assignment_statement_type * lang_add_assignment PARAMS ((union etree_union *));
 399 extern void lang_add_attribute PARAMS ((enum statement_enum));
 400 extern void lang_startup PARAMS ((const char *));
 401 extern void lang_float PARAMS ((bfd_boolean));
 402 extern void lang_leave_output_section_statement
 403   PARAMS ((fill_type *, const char *, struct lang_output_section_phdr_list *,
 404            const char *));
 405 extern void lang_abs_symbol_at_end_of PARAMS ((const char *, const char *));
 406 extern void lang_abs_symbol_at_beginning_of PARAMS ((const char *,
 407                                                      const char *));
 408 extern void lang_statement_append PARAMS ((struct statement_list *,
 409                                            union lang_statement_union *,
 410                                            union lang_statement_union **));
 411 extern void lang_for_each_input_file
 412   PARAMS ((void (*dothis) (lang_input_statement_type *)));
 413 extern void lang_for_each_file
 414   PARAMS ((void (*dothis) (lang_input_statement_type *)));
 415 extern void lang_reset_memory_regions PARAMS ((void));
 416 extern bfd_vma lang_do_assignments
 417   PARAMS ((lang_statement_union_type * s,
 418            lang_output_section_statement_type *output_section_statement,
 419            fill_type *fill,
 420            bfd_vma dot));
 421
 422 #define LANG_FOR_EACH_INPUT_STATEMENT(statement)                \
 423   lang_input_statement_type *statement;                         \
 424   for (statement = (lang_input_statement_type *)file_chain.head;\
 425        statement != (lang_input_statement_type *)NULL;          \
 426        statement = (lang_input_statement_type *)statement->next)\
 427
 428 extern void lang_process PARAMS ((void));
 429 extern void ldlang_add_file PARAMS ((lang_input_statement_type *));
 430 extern lang_output_section_statement_type *lang_output_section_find
 431   PARAMS ((const char * const));
 432 extern lang_input_statement_type *lang_add_input_file
 433   PARAMS ((const char *name, lang_input_file_enum_type file_type,
 434            const char *target));
 435 extern void lang_add_keepsyms_file PARAMS ((const char *filename));
 436 extern lang_output_section_statement_type *
 437   lang_output_section_statement_lookup PARAMS ((const char * const name));
 438 extern void ldlang_add_undef PARAMS ((const char *const name));
 439 extern void lang_add_output_format PARAMS ((const char *, const char *,
 440                                             const char *, int from_script));
 441 extern void lang_list_init PARAMS ((lang_statement_list_type*));
 442 extern void lang_add_data PARAMS ((int type, union etree_union *));
 443 extern void lang_add_reloc
 444   PARAMS ((bfd_reloc_code_real_type reloc, reloc_howto_type *howto,
 445            asection *section, const char *name, union etree_union *addend));
 446 extern void lang_for_each_statement
 447   PARAMS ((void (*func) (lang_statement_union_type *)));
 448 extern PTR stat_alloc PARAMS ((size_t size));
 449 extern void dprint_statement PARAMS ((lang_statement_union_type *, int));
 450 extern bfd_vma lang_size_sections
 451   PARAMS ((lang_statement_union_type *s,
 452            lang_output_section_statement_type *output_section_statement,
 453            lang_statement_union_type **prev, fill_type *fill,
 454            bfd_vma dot, bfd_boolean *relax));
 455 extern void lang_enter_group PARAMS ((void));
 456 extern void lang_leave_group PARAMS ((void));
 457 extern void lang_add_section
 458   PARAMS ((lang_statement_list_type *ptr, asection *section,
 459            lang_output_section_statement_type *output,
 460            lang_input_statement_type *file));
 461 extern void lang_new_phdr
 462   PARAMS ((const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *,
 463            etree_type *));
 464 extern void lang_add_nocrossref PARAMS ((struct lang_nocrossref *));
 465 extern void lang_enter_overlay PARAMS ((etree_type *));
 466 extern void lang_enter_overlay_section PARAMS ((const char *));
 467 extern void lang_leave_overlay_section
 468   PARAMS ((fill_type *, struct lang_output_section_phdr_list *));
 469 extern void lang_leave_overlay
 470   PARAMS ((etree_type *, int, fill_type *, const char *,
 471            struct lang_output_section_phdr_list *, const char *));
 472
 473 extern struct bfd_elf_version_tree *lang_elf_version_info;
 474
 475 extern struct bfd_elf_version_expr *lang_new_vers_pattern
 476   PARAMS ((struct bfd_elf_version_expr *, const char *, const char *));
 477 extern struct bfd_elf_version_tree *lang_new_vers_node
 478   PARAMS ((struct bfd_elf_version_expr *, struct bfd_elf_version_expr *));
 479 extern struct bfd_elf_version_deps *lang_add_vers_depend
 480   PARAMS ((struct bfd_elf_version_deps *, const char *));
 481 extern void lang_register_vers_node
 482   PARAMS ((const char *, struct bfd_elf_version_tree *,
 483            struct bfd_elf_version_deps *));
 484 bfd_boolean unique_section_p PARAMS ((const char *));
 485 extern void lang_add_unique PARAMS ((const char *));
 486 extern const char *lang_get_output_target PARAMS ((void));
 487
 488 #endif