ld/ldlang.h

   1 /* ldlang.h - linker command language support
   2    Copyright 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GLD, the Gnu Linker.
   6
   7    GLD is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 1, or (at your option)
  10    any later version.
  11
  12    GLD is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GLD; see the file COPYING.  If not, write to the Free
  19    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA.  */
  21
  22 #ifndef LDLANG_H
  23 #define LDLANG_H
  24
  25 typedef enum
  26 {
  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 typedef struct statement_list
  37 {
  38   union lang_statement_union *head;
  39   union lang_statement_union **tail;
  40 } lang_statement_list_type;
  41
  42
  43 typedef struct memory_region_struct
  44 {
  45   char *name;
  46   struct memory_region_struct *next;
  47   bfd_vma origin;
  48   bfd_size_type length;
  49   bfd_vma current;
  50   bfd_size_type old_length;
  51   flagword flags;
  52   flagword not_flags;
  53   boolean had_full_message;
  54 } lang_memory_region_type ;
  55
  56 typedef struct lang_statement_header_struct
  57 {
  58   union  lang_statement_union  *next;
  59   enum statement_enum
  60     {
  61       lang_output_section_statement_enum,
  62       lang_assignment_statement_enum,
  63       lang_input_statement_enum,
  64       lang_address_statement_enum,
  65       lang_wild_statement_enum,
  66       lang_input_section_enum,
  67       lang_object_symbols_statement_enum,
  68       lang_fill_statement_enum,
  69       lang_data_statement_enum,
  70       lang_reloc_statement_enum,
  71       lang_target_statement_enum,
  72       lang_output_statement_enum,
  73       lang_padding_statement_enum,
  74       lang_group_statement_enum,
  75
  76       lang_afile_asection_pair_statement_enum,
  77       lang_constructors_statement_enum
  78     } type;
  79 } lang_statement_header_type;
  80
  81
  82 typedef struct
  83 {
  84   lang_statement_header_type header;
  85   union etree_union *exp;
  86 } lang_assignment_statement_type;
  87
  88
  89 typedef struct lang_target_statement_struct
  90 {
  91   lang_statement_header_type header;
  92   const char *target;
  93 } lang_target_statement_type;
  94
  95
  96 typedef struct lang_output_statement_struct
  97 {
  98   lang_statement_header_type header;
  99   const char *name;
 100 } lang_output_statement_type;
 101
 102 /* Section types specified in a linker script.  */
 103
 104 enum section_type
 105 {
 106   normal_section,
 107   dsect_section,
 108   copy_section,
 109   noload_section,
 110   info_section,
 111   overlay_section
 112 };
 113
 114 /* This structure holds a list of program headers describing segments
 115    in which this section should be placed.  */
 116
 117 struct lang_output_section_phdr_list
 118 {
 119   struct lang_output_section_phdr_list *next;
 120   const char *name;
 121   boolean used;
 122 };
 123
 124 typedef struct lang_output_section_statement_struct
 125 {
 126   lang_statement_header_type header;
 127   union etree_union *addr_tree;
 128   lang_statement_list_type children;
 129   const char *memspec;
 130   union lang_statement_union *next;
 131   const char *name;
 132
 133   boolean processed;
 134
 135   asection *bfd_section;
 136   flagword flags;               /* Or together of all input sections */
 137   enum section_type sectype;
 138   struct memory_region_struct *region;
 139   struct memory_region_struct *lma_region;
 140   size_t block_value;
 141   fill_type fill;
 142
 143   int subsection_alignment;  /* alignment of components */
 144   int section_alignment;  /* alignment of start of section */
 145
 146   union etree_union *load_base;
 147
 148   struct lang_output_section_phdr_list *phdrs;
 149 } lang_output_section_statement_type;
 150
 151
 152 typedef struct
 153 {
 154   lang_statement_header_type header;
 155 } lang_common_statement_type;
 156
 157 typedef struct
 158 {
 159   lang_statement_header_type header;
 160 } lang_object_symbols_statement_type;
 161
 162 typedef struct
 163 {
 164   lang_statement_header_type header;
 165   fill_type fill;
 166   int size;
 167   asection *output_section;
 168 } lang_fill_statement_type;
 169
 170 typedef struct
 171 {
 172   lang_statement_header_type header;
 173   unsigned int type;
 174   union  etree_union *exp;
 175   bfd_vma value;
 176   asection *output_section;
 177   bfd_vma output_vma;
 178 } lang_data_statement_type;
 179
 180 /* Generate a reloc in the output file.  */
 181
 182 typedef struct
 183 {
 184   lang_statement_header_type header;
 185
 186   /* Reloc to generate.  */
 187   bfd_reloc_code_real_type reloc;
 188
 189   /* Reloc howto structure.  */
 190   reloc_howto_type *howto;
 191
 192   /* Section to generate reloc against.  Exactly one of section and
 193      name must be NULL.  */
 194   asection *section;
 195
 196   /* Name of symbol to generate reloc against.  Exactly one of section
 197      and name must be NULL.  */
 198   const char *name;
 199
 200   /* Expression for addend.  */
 201   union etree_union *addend_exp;
 202
 203   /* Resolved addend.  */
 204   bfd_vma addend_value;
 205
 206   /* Output section where reloc should be performed.  */
 207   asection *output_section;
 208
 209   /* VMA within output section.  */
 210   bfd_vma output_vma;
 211 } lang_reloc_statement_type;
 212
 213 typedef struct lang_input_statement_struct
 214 {
 215   lang_statement_header_type header;
 216   /* Name of this file.  */
 217   const char *filename;
 218   /* Name to use for the symbol giving address of text start */
 219   /* Usually the same as filename, but for a file spec'd with -l
 220      this is the -l switch itself rather than the filename.  */
 221   const char *local_sym_name;
 222
 223   bfd *the_bfd;
 224
 225   boolean closed;
 226   file_ptr passive_position;
 227
 228   /* Symbol table of the file.  */
 229   asymbol **asymbols;
 230   unsigned int symbol_count;
 231
 232   /* Point to the next file - whatever it is, wanders up and down
 233      archives */
 234
 235   union lang_statement_union  *next;
 236   /* Point to the next file, but skips archive contents */
 237   union  lang_statement_union  *next_real_file;
 238
 239   boolean is_archive;
 240
 241   /* 1 means search a set of directories for this file.  */
 242   boolean search_dirs_flag;
 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
 248   boolean just_syms_flag;
 249
 250   /* Whether to search for this entry as a dynamic archive.  */
 251   boolean dynamic;
 252
 253   /* Whether to include the entire contents of an archive.  */
 254   boolean whole_archive;
 255
 256   boolean loaded;
 257
 258   /*    unsigned int globals_in_this_file;*/
 259   const char *target;
 260   boolean real;
 261 } lang_input_statement_type;
 262
 263 typedef struct
 264 {
 265   lang_statement_header_type header;
 266   asection *section;
 267   lang_input_statement_type *ifile;
 268
 269 } lang_input_section_type;
 270
 271
 272 typedef struct
 273 {
 274   lang_statement_header_type header;
 275   asection *section;
 276   union lang_statement_union *file;
 277 } lang_afile_asection_pair_statement_type;
 278
 279 typedef struct lang_wild_statement_struct
 280 {
 281   lang_statement_header_type header;
 282   const char *section_name;
 283   boolean sections_sorted;
 284   const char *filename;
 285   boolean filenames_sorted;
 286   boolean keep_sections;
 287   struct name_list *exclude_filename_list;
 288   lang_statement_list_type children;
 289 } lang_wild_statement_type;
 290
 291 typedef struct lang_address_statement_struct
 292 {
 293   lang_statement_header_type header;
 294   const  char *section_name;
 295   union  etree_union *address;
 296 } lang_address_statement_type;
 297
 298 typedef struct
 299 {
 300   lang_statement_header_type header;
 301   bfd_vma output_offset;
 302   size_t size;
 303   asection *output_section;
 304   fill_type fill;
 305 } lang_padding_statement_type;
 306
 307 /* A group statement collects a set of libraries together.  The
 308    libraries are searched multiple times, until no new undefined
 309    symbols are found.  The effect is to search a group of libraries as
 310    though they were a single library.  */
 311
 312 typedef struct
 313 {
 314   lang_statement_header_type header;
 315   lang_statement_list_type children;
 316 } lang_group_statement_type;
 317
 318 typedef union lang_statement_union
 319 {
 320   lang_statement_header_type header;
 321   union lang_statement_union *next;
 322   lang_wild_statement_type wild_statement;
 323   lang_data_statement_type data_statement;
 324   lang_reloc_statement_type reloc_statement;
 325   lang_address_statement_type address_statement;
 326   lang_output_section_statement_type output_section_statement;
 327   lang_afile_asection_pair_statement_type afile_asection_pair_statement;
 328   lang_assignment_statement_type assignment_statement;
 329   lang_input_statement_type input_statement;
 330   lang_target_statement_type target_statement;
 331   lang_output_statement_type output_statement;
 332   lang_input_section_type input_section;
 333   lang_common_statement_type common_statement;
 334   lang_object_symbols_statement_type object_symbols_statement;
 335   lang_fill_statement_type fill_statement;
 336   lang_padding_statement_type padding_statement;
 337   lang_group_statement_type group_statement;
 338 } lang_statement_union_type;
 339
 340 /* This structure holds information about a program header, from the
 341    PHDRS command in the linker script.  */
 342
 343 struct lang_phdr
 344 {
 345   struct lang_phdr *next;
 346   const char *name;
 347   unsigned long type;
 348   boolean filehdr;
 349   boolean phdrs;
 350   etree_type *at;
 351   etree_type *flags;
 352 };
 353
 354 /* This structure is used to hold a list of sections which may not
 355    cross reference each other.  */
 356
 357 struct lang_nocrossref
 358 {
 359   struct lang_nocrossref *next;
 360   const char *name;
 361 };
 362
 363 /* The list of nocrossref lists.  */
 364
 365 struct lang_nocrossrefs
 366 {
 367   struct lang_nocrossrefs *next;
 368   struct lang_nocrossref *list;
 369 };
 370
 371 extern struct lang_nocrossrefs *nocrossref_list;
 372
 373 extern lang_output_section_statement_type *abs_output_section;
 374 extern lang_statement_list_type lang_output_section_statement;
 375 extern boolean lang_has_input_file;
 376 extern etree_type *base;
 377 extern lang_statement_list_type *stat_ptr;
 378 extern boolean delete_output_file_on_failure;
 379
 380 extern const char *entry_symbol;
 381 extern boolean entry_from_cmdline;
 382 extern lang_statement_list_type file_chain;
 383
 384 extern void lang_init PARAMS ((void));
 385 extern struct memory_region_struct *lang_memory_region_lookup
 386   PARAMS ((const char *const));
 387 extern struct memory_region_struct *lang_memory_region_default
 388   PARAMS ((asection *));
 389 extern void lang_map PARAMS ((void));
 390 extern void lang_set_flags PARAMS ((lang_memory_region_type *, const char *,
 391                                     int));
 392 extern void lang_add_output PARAMS ((const char *, int from_script));
 393 extern lang_output_section_statement_type *lang_enter_output_section_statement
 394   PARAMS ((const char *output_section_statement_name,
 395            etree_type * address_exp,
 396            enum section_type sectype,
 397            bfd_vma block_value,
 398            etree_type *align,
 399            etree_type *subalign,
 400            etree_type *));
 401 extern void lang_final PARAMS ((void));
 402 extern void lang_process PARAMS ((void));
 403 extern void lang_section_start PARAMS ((const char *, union etree_union *));
 404 extern void lang_add_entry PARAMS ((const char *, boolean));
 405 extern void lang_add_target PARAMS ((const char *));
 406 extern void lang_add_wild
 407   PARAMS ((const char *, boolean, const char *, boolean, boolean, name_list *));
 408 extern void lang_add_map PARAMS ((const char *));
 409 extern void lang_add_fill PARAMS ((int));
 410 extern lang_assignment_statement_type * lang_add_assignment PARAMS ((union etree_union *));
 411 extern void lang_add_attribute PARAMS ((enum statement_enum));
 412 extern void lang_startup PARAMS ((const char *));
 413 extern void lang_float PARAMS ((enum bfd_boolean));
 414 extern void lang_leave_output_section_statement
 415   PARAMS ((bfd_vma, const char *, struct lang_output_section_phdr_list *,
 416            const char *));
 417 extern void lang_abs_symbol_at_end_of PARAMS ((const char *, const char *));
 418 extern void lang_abs_symbol_at_beginning_of PARAMS ((const char *,
 419                                                      const char *));
 420 extern void lang_statement_append PARAMS ((struct statement_list *,
 421                                            union lang_statement_union *,
 422                                            union lang_statement_union **));
 423 extern void lang_for_each_input_file
 424   PARAMS ((void (*dothis) (lang_input_statement_type *)));
 425 extern void lang_for_each_file
 426   PARAMS ((void (*dothis) (lang_input_statement_type *)));
 427 extern bfd_vma lang_do_assignments
 428   PARAMS ((lang_statement_union_type * s,
 429            lang_output_section_statement_type *output_section_statement,
 430            fill_type fill,
 431            bfd_vma dot));
 432
 433 #define LANG_FOR_EACH_INPUT_STATEMENT(statement)                \
 434   lang_input_statement_type *statement;                         \
 435   for (statement = (lang_input_statement_type *)file_chain.head;\
 436        statement != (lang_input_statement_type *)NULL;          \
 437        statement = (lang_input_statement_type *)statement->next)\
 438
 439 extern void lang_process PARAMS ((void));
 440 extern void ldlang_add_file PARAMS ((lang_input_statement_type *));
 441 extern lang_output_section_statement_type *lang_output_section_find
 442   PARAMS ((const char * const));
 443 extern lang_input_statement_type *lang_add_input_file
 444   PARAMS ((const char *name, lang_input_file_enum_type file_type,
 445            const char *target));
 446 extern void lang_add_keepsyms_file PARAMS ((const char *filename));
 447 extern lang_output_section_statement_type *
 448   lang_output_section_statement_lookup PARAMS ((const char * const name));
 449 extern void ldlang_add_undef PARAMS ((const char *const name));
 450 extern void lang_add_output_format PARAMS ((const char *, const char *,
 451                                             const char *, int from_script));
 452 extern void lang_list_init PARAMS ((lang_statement_list_type*));
 453 extern void lang_add_data PARAMS ((int type, union etree_union *));
 454 extern void lang_add_reloc
 455   PARAMS ((bfd_reloc_code_real_type reloc, reloc_howto_type *howto,
 456            asection *section, const char *name, union etree_union *addend));
 457 extern void lang_for_each_statement
 458   PARAMS ((void (*func) (lang_statement_union_type *)));
 459 extern PTR stat_alloc PARAMS ((size_t size));
 460 extern void dprint_statement PARAMS ((lang_statement_union_type *, int));
 461 extern bfd_vma lang_size_sections
 462   PARAMS ((lang_statement_union_type *s,
 463            lang_output_section_statement_type *output_section_statement,
 464            lang_statement_union_type **prev, fill_type fill,
 465            bfd_vma dot, boolean relax));
 466 extern void lang_enter_group PARAMS ((void));
 467 extern void lang_leave_group PARAMS ((void));
 468 extern void wild_doit
 469   PARAMS ((lang_statement_list_type *ptr, asection *section,
 470            lang_output_section_statement_type *output,
 471            lang_input_statement_type *file));
 472 extern void lang_new_phdr
 473   PARAMS ((const char *, etree_type *, boolean, boolean, etree_type *,
 474            etree_type *));
 475 extern void lang_add_nocrossref PARAMS ((struct lang_nocrossref *));
 476 extern void lang_enter_overlay PARAMS ((etree_type *, etree_type *, int));
 477 extern void lang_enter_overlay_section PARAMS ((const char *));
 478 extern void lang_leave_overlay_section
 479   PARAMS ((bfd_vma, struct lang_output_section_phdr_list *));
 480 extern void lang_leave_overlay
 481   PARAMS ((bfd_vma, const char *, struct lang_output_section_phdr_list *,
 482            const char *));
 483
 484 extern struct bfd_elf_version_tree *lang_elf_version_info;
 485
 486 extern struct bfd_elf_version_expr *lang_new_vers_regex
 487   PARAMS ((struct bfd_elf_version_expr *, const char *, const char *));
 488 extern struct bfd_elf_version_tree *lang_new_vers_node
 489   PARAMS ((struct bfd_elf_version_expr *, struct bfd_elf_version_expr *));
 490 extern struct bfd_elf_version_deps *lang_add_vers_depend
 491   PARAMS ((struct bfd_elf_version_deps *, const char *));
 492 extern void lang_register_vers_node
 493   PARAMS ((const char *, struct bfd_elf_version_tree *,
 494            struct bfd_elf_version_deps *));
 495
 496 #endif