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