ld/ldlang.h

   1 /* ldlang.h - linker command language support
   2    Copyright (C) 1991-2021 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU Binutils.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #ifndef LDLANG_H
  22 #define LDLANG_H
  23
  24 #define DEFAULT_MEMORY_REGION   "*default*"
  25
  26 #define SECTION_NAME_MAP_LENGTH (16)
  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   union etree_union *origin_exp;
  61   bfd_vma origin;
  62   bfd_size_type length;
  63   union etree_union *length_exp;
  64   bfd_vma current;
  65   union lang_statement_union *last_os;
  66   flagword flags;
  67   flagword not_flags;
  68   bfd_boolean had_full_message;
  69 } lang_memory_region_type;
  70
  71 enum statement_enum
  72 {
  73   lang_address_statement_enum,
  74   lang_assignment_statement_enum,
  75   lang_data_statement_enum,
  76   lang_fill_statement_enum,
  77   lang_group_statement_enum,
  78   lang_input_section_enum,
  79   lang_input_statement_enum,
  80   lang_insert_statement_enum,
  81   lang_output_section_statement_enum,
  82   lang_output_statement_enum,
  83   lang_padding_statement_enum,
  84   lang_reloc_statement_enum,
  85   lang_target_statement_enum,
  86   lang_wild_statement_enum,
  87   lang_constructors_statement_enum,
  88   lang_object_symbols_statement_enum
  89 };
  90
  91 typedef struct lang_statement_header_struct
  92 {
  93   /* Next pointer for statement_list statement list.  */
  94   union lang_statement_union *next;
  95   enum statement_enum type;
  96 } lang_statement_header_type;
  97
  98 typedef struct
  99 {
 100   lang_statement_header_type header;
 101   union etree_union *exp;
 102 } lang_assignment_statement_type;
 103
 104 typedef struct lang_target_statement_struct
 105 {
 106   lang_statement_header_type header;
 107   const char *target;
 108 } lang_target_statement_type;
 109
 110 typedef struct lang_output_statement_struct
 111 {
 112   lang_statement_header_type header;
 113   const char *name;
 114 } lang_output_statement_type;
 115
 116 /* Section types specified in a linker script.  */
 117
 118 enum section_type
 119 {
 120   normal_section,
 121   first_overlay_section,
 122   overlay_section,
 123   noload_section,
 124   noalloc_section
 125 };
 126
 127 /* This structure holds a list of program headers describing
 128    segments in which this section should be placed.  */
 129
 130 typedef struct lang_output_section_phdr_list
 131 {
 132   struct lang_output_section_phdr_list *next;
 133   const char *name;
 134   bfd_boolean used;
 135 } lang_output_section_phdr_list;
 136
 137 typedef struct lang_output_section_statement_struct
 138 {
 139   lang_statement_header_type header;
 140   lang_statement_list_type children;
 141   struct lang_output_section_statement_struct *next;
 142   struct lang_output_section_statement_struct *prev;
 143   const char *name;
 144   asection *bfd_section;
 145   lang_memory_region_type *region;
 146   lang_memory_region_type *lma_region;
 147   fill_type *fill;
 148   union etree_union *addr_tree;
 149   union etree_union *load_base;
 150   union etree_union *section_alignment;
 151   union etree_union *subsection_alignment;
 152
 153   /* If non-null, an expression to evaluate after setting the section's
 154      size.  The expression is evaluated inside REGION (above) with '.'
 155      set to the end of the section.  Used in the last overlay section
 156      to move '.' past all the overlaid sections.  */
 157   union etree_union *update_dot_tree;
 158
 159   lang_output_section_phdr_list *phdrs;
 160
 161   unsigned int block_value;
 162   int constraint;
 163   flagword flags;
 164   enum section_type sectype;
 165   unsigned int processed_vma : 1;
 166   unsigned int processed_lma : 1;
 167   unsigned int all_input_readonly : 1;
 168   /* If this section should be ignored.  */
 169   unsigned int ignored : 1;
 170   /* If this section should update "dot".  Prevents section being ignored.  */
 171   unsigned int update_dot : 1;
 172   /* If this section is after assignment to _end.  */
 173   unsigned int after_end : 1;
 174   /* If this section uses the alignment of its input sections.  */
 175   unsigned int align_lma_with_input : 1;
 176   /* If script has duplicate output section statements of the same name
 177      create duplicate output sections.  */
 178   unsigned int dup_output : 1;
 179 } lang_output_section_statement_type;
 180
 181 typedef struct
 182 {
 183   lang_statement_header_type header;
 184   fill_type *fill;
 185   int size;
 186   asection *output_section;
 187 } lang_fill_statement_type;
 188
 189 typedef struct
 190 {
 191   lang_statement_header_type header;
 192   unsigned int type;
 193   union etree_union *exp;
 194   bfd_vma value;
 195   asection *output_section;
 196   bfd_vma output_offset;
 197 } lang_data_statement_type;
 198
 199 /* Generate a reloc in the output file.  */
 200
 201 typedef struct
 202 {
 203   lang_statement_header_type header;
 204
 205   /* Reloc to generate.  */
 206   bfd_reloc_code_real_type reloc;
 207
 208   /* Reloc howto structure.  */
 209   reloc_howto_type *howto;
 210
 211   /* Section to generate reloc against.
 212      Exactly one of section and name must be NULL.  */
 213   asection *section;
 214
 215   /* Name of symbol to generate reloc against.
 216      Exactly one of section and name must be NULL.  */
 217   const char *name;
 218
 219   /* Expression for addend.  */
 220   union etree_union *addend_exp;
 221
 222   /* Resolved addend.  */
 223   bfd_vma addend_value;
 224
 225   /* Output section where reloc should be performed.  */
 226   asection *output_section;
 227
 228   /* Offset within output section.  */
 229   bfd_vma output_offset;
 230 } lang_reloc_statement_type;
 231
 232 struct lang_input_statement_flags
 233 {
 234   /* 1 means this file was specified in a -l option.  */
 235   unsigned int maybe_archive : 1;
 236
 237   /* 1 means this file was specified in a -l:namespec option.  */
 238   unsigned int full_name_provided : 1;
 239
 240   /* 1 means search a set of directories for this file.  */
 241   unsigned int search_dirs : 1;
 242
 243   /* 1 means this was found when processing a script in the sysroot.  */
 244   unsigned int sysrooted : 1;
 245
 246   /* 1 means this is base file of incremental load.
 247      Do not load this file's text or data.
 248      Also default text_start to after this file's bss.  */
 249   unsigned int just_syms : 1;
 250
 251   /* Whether to search for this entry as a dynamic archive.  */
 252   unsigned int dynamic : 1;
 253
 254   /* Set if a DT_NEEDED tag should be added not just for the dynamic library
 255      explicitly given by this entry but also for any dynamic libraries in
 256      this entry's needed list.  */
 257   unsigned int add_DT_NEEDED_for_dynamic : 1;
 258
 259   /* Set if this entry should cause a DT_NEEDED tag only when some
 260      regular file references its symbols (ie. --as-needed is in effect).  */
 261   unsigned int add_DT_NEEDED_for_regular : 1;
 262
 263   /* Whether to include the entire contents of an archive.  */
 264   unsigned int whole_archive : 1;
 265
 266   /* Set when bfd opening is successful.  */
 267   unsigned int loaded : 1;
 268
 269   unsigned int real : 1;
 270
 271   /* Set if the file does not exist.  */
 272   unsigned int missing_file : 1;
 273
 274   /* Set if reloading an archive or --as-needed lib.  */
 275   unsigned int reload : 1;
 276
 277 #if BFD_SUPPORTS_PLUGINS
 278   /* Set if the file was claimed by a plugin.  */
 279   unsigned int claimed : 1;
 280
 281   /* Set if the file was claimed from an archive.  */
 282   unsigned int claim_archive : 1;
 283
 284   /* Set if added by the lto plugin add_input_file callback.  */
 285   unsigned int lto_output : 1;
 286 #endif /* BFD_SUPPORTS_PLUGINS */
 287
 288   /* Head of list of pushed flags.  */
 289   struct lang_input_statement_flags *pushed;
 290 };
 291
 292 typedef struct lang_input_statement_struct
 293 {
 294   lang_statement_header_type header;
 295   /* Name of this file.  */
 296   const char *filename;
 297   /* Name to use for the symbol giving address of text start.
 298      Usually the same as filename, but for a file spec'd with
 299      -l this is the -l switch itself rather than the filename.  */
 300   const char *local_sym_name;
 301   /* Extra search path. Used to find a file relative to the
 302      directory of the current linker script.  */
 303   const char *extra_search_path;
 304
 305   bfd *the_bfd;
 306
 307   ctf_archive_t *the_ctf;
 308
 309   struct flag_info *section_flag_list;
 310
 311   /* Next pointer for file_chain statement list.  */
 312   struct lang_input_statement_struct *next;
 313
 314   /* Next pointer for input_file_chain statement list.  */
 315   struct lang_input_statement_struct *next_real_file;
 316
 317   const char *target;
 318
 319   struct lang_input_statement_flags flags;
 320 } lang_input_statement_type;
 321
 322 typedef struct
 323 {
 324   lang_statement_header_type header;
 325   asection *section;
 326 } lang_input_section_type;
 327
 328 struct map_symbol_def {
 329   struct bfd_link_hash_entry *entry;
 330   struct map_symbol_def *next;
 331 };
 332
 333 /* For input sections, when writing a map file: head / tail of a linked
 334    list of hash table entries for symbols defined in this section.  */
 335 typedef struct input_section_userdata_struct
 336 {
 337   struct map_symbol_def *map_symbol_def_head;
 338   struct map_symbol_def **map_symbol_def_tail;
 339   unsigned long map_symbol_def_count;
 340 } input_section_userdata_type;
 341
 342 static inline bfd_boolean
 343 bfd_input_just_syms (const bfd *abfd)
 344 {
 345   lang_input_statement_type *is = bfd_usrdata (abfd);
 346   return is != NULL && is->flags.just_syms;
 347 }
 348
 349 typedef struct lang_wild_statement_struct lang_wild_statement_type;
 350
 351 typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *,
 352                             asection *, struct flag_info *,
 353                             lang_input_statement_type *, void *);
 354
 355 typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *,
 356                                              lang_input_statement_type *,
 357                                              callback_t callback,
 358                                              void *data);
 359
 360 typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *,
 361                                                  bfd *, const asection *);
 362
 363 /* Binary search tree structure to efficiently sort sections by
 364    name.  */
 365 typedef struct lang_section_bst
 366 {
 367   asection *section;
 368   struct lang_section_bst *left;
 369   struct lang_section_bst *right;
 370 } lang_section_bst_type;
 371
 372 struct lang_wild_statement_struct
 373 {
 374   lang_statement_header_type header;
 375   const char *filename;
 376   bfd_boolean filenames_sorted;
 377   struct wildcard_list *section_list;
 378   bfd_boolean keep_sections;
 379   lang_statement_list_type children;
 380   struct name_list *exclude_name_list;
 381
 382   walk_wild_section_handler_t walk_wild_section_handler;
 383   struct wildcard_list *handler_data[4];
 384   lang_section_bst_type *tree;
 385   struct flag_info *section_flag_list;
 386 };
 387
 388 typedef struct lang_address_statement_struct
 389 {
 390   lang_statement_header_type header;
 391   const char *section_name;
 392   union etree_union *address;
 393   const segment_type *segment;
 394 } lang_address_statement_type;
 395
 396 typedef struct
 397 {
 398   lang_statement_header_type header;
 399   bfd_vma output_offset;
 400   bfd_size_type size;
 401   asection *output_section;
 402   fill_type *fill;
 403 } lang_padding_statement_type;
 404
 405 /* A group statement collects a set of libraries together.  The
 406    libraries are searched multiple times, until no new undefined
 407    symbols are found.  The effect is to search a group of libraries as
 408    though they were a single library.  */
 409
 410 typedef struct
 411 {
 412   lang_statement_header_type header;
 413   lang_statement_list_type children;
 414 } lang_group_statement_type;
 415
 416 typedef struct
 417 {
 418   lang_statement_header_type header;
 419   const char *where;
 420   bfd_boolean is_before;
 421 } lang_insert_statement_type;
 422
 423 typedef union lang_statement_union
 424 {
 425   lang_statement_header_type header;
 426   lang_address_statement_type address_statement;
 427   lang_assignment_statement_type assignment_statement;
 428   lang_data_statement_type data_statement;
 429   lang_fill_statement_type fill_statement;
 430   lang_group_statement_type group_statement;
 431   lang_input_section_type input_section;
 432   lang_input_statement_type input_statement;
 433   lang_insert_statement_type insert_statement;
 434   lang_output_section_statement_type output_section_statement;
 435   lang_output_statement_type output_statement;
 436   lang_padding_statement_type padding_statement;
 437   lang_reloc_statement_type reloc_statement;
 438   lang_target_statement_type target_statement;
 439   lang_wild_statement_type wild_statement;
 440 } lang_statement_union_type;
 441
 442 /* This structure holds information about a program header, from the
 443    PHDRS command in the linker script.  */
 444
 445 struct lang_phdr
 446 {
 447   struct lang_phdr *next;
 448   const char *name;
 449   unsigned long type;
 450   bfd_boolean filehdr;
 451   bfd_boolean phdrs;
 452   etree_type *at;
 453   etree_type *flags;
 454 };
 455
 456 /* This structure is used to hold a list of sections which may not
 457    cross reference each other.  */
 458
 459 typedef struct lang_nocrossref
 460 {
 461   struct lang_nocrossref *next;
 462   const char *name;
 463 } lang_nocrossref_type;
 464
 465 /* The list of nocrossref lists.  */
 466
 467 struct lang_nocrossrefs
 468 {
 469   struct lang_nocrossrefs *next;
 470   lang_nocrossref_type *list;
 471   bfd_boolean onlyfirst;
 472 };
 473
 474 /* This structure is used to hold a list of input section names which
 475    will not match an output section in the linker script.  */
 476
 477 struct unique_sections
 478 {
 479   struct unique_sections *next;
 480   const char *name;
 481 };
 482
 483 /* Used by place_orphan to keep track of orphan sections and statements.  */
 484
 485 struct orphan_save
 486 {
 487   const char *name;
 488   flagword flags;
 489   lang_output_section_statement_type *os;
 490   asection **section;
 491   lang_statement_union_type **stmt;
 492   lang_output_section_statement_type **os_tail;
 493 };
 494
 495 struct asneeded_minfo
 496 {
 497   struct asneeded_minfo *next;
 498   const char *soname;
 499   bfd *ref;
 500   const char *name;
 501 };
 502
 503 extern struct lang_phdr *lang_phdr_list;
 504 extern struct lang_nocrossrefs *nocrossref_list;
 505 extern const char *output_target;
 506 extern lang_output_section_statement_type *abs_output_section;
 507 extern lang_statement_list_type lang_os_list;
 508 extern struct lang_input_statement_flags input_flags;
 509 extern bfd_boolean lang_has_input_file;
 510 extern lang_statement_list_type *stat_ptr;
 511 extern bfd_boolean delete_output_file_on_failure;
 512
 513 extern struct bfd_sym_chain entry_symbol;
 514 extern const char *entry_section;
 515 extern bfd_boolean entry_from_cmdline;
 516 extern lang_statement_list_type file_chain;
 517 extern lang_statement_list_type input_file_chain;
 518
 519 extern struct bfd_elf_dynamic_list **current_dynamic_list_p;
 520
 521 extern int lang_statement_iteration;
 522 extern struct asneeded_minfo **asneeded_list_tail;
 523
 524 extern void (*output_bfd_hash_table_free_fn) (struct bfd_link_hash_table *);
 525
 526 extern void lang_init
 527   (void);
 528 extern void lang_finish
 529   (void);
 530 extern lang_memory_region_type * lang_memory_region_lookup
 531   (const char * const, bfd_boolean);
 532 extern void lang_memory_region_alias
 533   (const char *, const char *);
 534 extern void lang_map
 535   (void);
 536 extern void lang_set_flags
 537   (lang_memory_region_type *, const char *, int);
 538 extern void lang_add_output
 539   (const char *, int from_script);
 540 extern lang_output_section_statement_type *lang_enter_output_section_statement
 541   (const char *, etree_type *, enum section_type, etree_type *, etree_type *,
 542    etree_type *, int, int);
 543 extern void lang_final
 544   (void);
 545 extern void lang_relax_sections
 546   (bfd_boolean);
 547 extern void lang_process
 548   (void);
 549 extern void lang_section_start
 550   (const char *, union etree_union *, const segment_type *);
 551 extern void lang_add_entry
 552   (const char *, bfd_boolean);
 553 extern void lang_default_entry
 554   (const char *);
 555 extern void lang_add_target
 556   (const char *);
 557 extern void lang_add_wild
 558   (struct wildcard_spec *, struct wildcard_list *, bfd_boolean);
 559 extern void lang_add_map
 560   (const char *);
 561 extern void lang_add_fill
 562   (fill_type *);
 563 extern lang_assignment_statement_type *lang_add_assignment
 564   (union etree_union *);
 565 extern void lang_add_attribute
 566   (enum statement_enum);
 567 extern void lang_startup
 568   (const char *);
 569 extern void lang_float
 570   (bfd_boolean);
 571 extern void lang_leave_output_section_statement
 572   (fill_type *, const char *, lang_output_section_phdr_list *,
 573    const char *);
 574 extern void lang_for_each_input_file
 575   (void (*dothis) (lang_input_statement_type *));
 576 extern void lang_for_each_file
 577   (void (*dothis) (lang_input_statement_type *));
 578 extern void lang_reset_memory_regions
 579   (void);
 580 extern void lang_do_assignments
 581   (lang_phase_type);
 582 extern asection *section_for_dot
 583   (void);
 584
 585 #define LANG_FOR_EACH_INPUT_STATEMENT(statement)                        \
 586   lang_input_statement_type *statement;                                 \
 587   for (statement = (lang_input_statement_type *) file_chain.head;       \
 588        statement != NULL;                                               \
 589        statement = statement->next)
 590
 591 #define lang_output_section_find(NAME) \
 592   lang_output_section_statement_lookup (NAME, 0, 0)
 593
 594 extern void lang_process
 595   (void);
 596 extern void ldlang_add_file
 597   (lang_input_statement_type *);
 598 extern lang_output_section_statement_type *lang_output_section_find_by_flags
 599   (const asection *, flagword, lang_output_section_statement_type **,
 600    lang_match_sec_type_func);
 601 extern lang_output_section_statement_type *lang_insert_orphan
 602   (asection *, const char *, int, lang_output_section_statement_type *,
 603    struct orphan_save *, etree_type *, lang_statement_list_type *);
 604 extern lang_input_statement_type *lang_add_input_file
 605   (const char *, lang_input_file_enum_type, const char *);
 606 extern void lang_add_keepsyms_file
 607   (const char *);
 608 extern lang_output_section_statement_type *lang_output_section_get
 609   (const asection *);
 610 extern lang_output_section_statement_type *lang_output_section_statement_lookup
 611   (const char *, int, int);
 612 extern lang_output_section_statement_type *next_matching_output_section_statement
 613   (lang_output_section_statement_type *, int);
 614 extern void ldlang_add_undef
 615   (const char *const, bfd_boolean);
 616 extern void ldlang_add_require_defined
 617   (const char *const);
 618 extern void lang_add_output_format
 619   (const char *, const char *, const char *, int);
 620 extern void lang_list_init
 621   (lang_statement_list_type *);
 622 extern void push_stat_ptr
 623   (lang_statement_list_type *);
 624 extern void pop_stat_ptr
 625   (void);
 626 extern void lang_add_data
 627   (int type, union etree_union *);
 628 extern void lang_add_reloc
 629   (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *,
 630    union etree_union *);
 631 extern void lang_for_each_statement
 632   (void (*) (lang_statement_union_type *));
 633 extern void lang_for_each_statement_worker
 634   (void (*) (lang_statement_union_type *), lang_statement_union_type *);
 635 extern void *stat_alloc
 636   (size_t);
 637 extern void strip_excluded_output_sections
 638   (void);
 639 extern void lang_clear_os_map
 640   (void);
 641 extern void dprint_statement
 642   (lang_statement_union_type *, int);
 643 extern void lang_size_sections
 644   (bfd_boolean *, bfd_boolean);
 645 extern void one_lang_size_sections_pass
 646   (bfd_boolean *, bfd_boolean);
 647 extern void lang_add_insert
 648   (const char *, int);
 649 extern void lang_enter_group
 650   (void);
 651 extern void lang_leave_group
 652   (void);
 653 extern void lang_add_section
 654   (lang_statement_list_type *, asection *,
 655    struct flag_info *, lang_output_section_statement_type *);
 656 extern void lang_new_phdr
 657   (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *,
 658    etree_type *);
 659 extern void lang_add_nocrossref
 660   (lang_nocrossref_type *);
 661 extern void lang_add_nocrossref_to
 662   (lang_nocrossref_type *);
 663 extern void lang_enter_overlay
 664   (etree_type *, etree_type *);
 665 extern void lang_enter_overlay_section
 666   (const char *);
 667 extern void lang_leave_overlay_section
 668   (fill_type *, lang_output_section_phdr_list *);
 669 extern void lang_leave_overlay
 670   (etree_type *, int, fill_type *, const char *,
 671    lang_output_section_phdr_list *, const char *);
 672
 673 extern struct bfd_elf_version_expr *lang_new_vers_pattern
 674   (struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean);
 675 extern struct bfd_elf_version_tree *lang_new_vers_node
 676   (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *);
 677 extern struct bfd_elf_version_deps *lang_add_vers_depend
 678   (struct bfd_elf_version_deps *, const char *);
 679 extern void lang_register_vers_node
 680   (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *);
 681 extern void lang_append_dynamic_list (struct bfd_elf_dynamic_list **,
 682                                       struct bfd_elf_version_expr *);
 683 extern void lang_append_dynamic_list_cpp_typeinfo (void);
 684 extern void lang_append_dynamic_list_cpp_new (void);
 685 extern void lang_add_unique
 686   (const char *);
 687 extern const char *lang_get_output_target
 688   (void);
 689 extern void add_excluded_libs (const char *);
 690 extern bfd_boolean load_symbols
 691   (lang_input_statement_type *, lang_statement_list_type *);
 692
 693 struct elf_sym_strtab;
 694 struct elf_strtab_hash;
 695 extern void ldlang_ctf_acquire_strings
 696   (struct elf_strtab_hash *);
 697 extern void ldlang_ctf_new_dynsym
 698   (int symidx, struct elf_internal_sym *);
 699 extern void ldlang_write_ctf_late
 700   (void);
 701 extern bfd_boolean
 702 ldlang_override_segment_assignment
 703   (struct bfd_link_info *, bfd *, asection *, asection *, bfd_boolean);
 704
 705 extern void
 706 lang_ld_feature (char *);
 707
 708 extern void
 709 lang_print_memory_usage (void);
 710
 711 extern void
 712 lang_add_gc_name (const char *);
 713
 714 extern bfd_boolean
 715 print_one_symbol (struct bfd_link_hash_entry *hash_entry, void *ptr);
 716
 717 #endif