ld/ld.h

   1 /* ld.h -- general linker header file
   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 LD_H
  24 #define LD_H
  25
  26 #ifdef HAVE_LOCALE_H
  27 # include <locale.h>
  28 #endif
  29
  30 #ifdef ENABLE_NLS
  31 # include <libintl.h>
  32 # define _(String) gettext (String)
  33 # ifdef gettext_noop
  34 #  define N_(String) gettext_noop (String)
  35 # else
  36 #  define N_(String) (String)
  37 # endif
  38 #else
  39 # define gettext(Msgid) (Msgid)
  40 # define dgettext(Domainname, Msgid) (Msgid)
  41 # define dcgettext(Domainname, Msgid, Category) (Msgid)
  42 # define textdomain(Domainname) while (0) /* nothing */
  43 # define bindtextdomain(Domainname, Dirname) while (0) /* nothing */
  44 # define _(String) (String)
  45 # define N_(String) (String)
  46 #endif
  47
  48 #include "bin-bugs.h"
  49
  50 /* Look in this environment name for the linker to pretend to be */
  51 #define EMULATION_ENVIRON "LDEMULATION"
  52 /* If in there look for the strings: */
  53
  54 /* Look in this variable for a target format */
  55 #define TARGET_ENVIRON "GNUTARGET"
  56
  57 /* Input sections which are put in a section of this name are actually
  58    discarded.  */
  59 #define DISCARD_SECTION_NAME "/DISCARD/"
  60
  61 /* A file name list */
  62 typedef struct name_list {
  63   const char *name;
  64   struct name_list *next;
  65 }
  66 name_list;
  67
  68 /* A wildcard specification.  */
  69
  70 typedef enum {
  71   none, by_name, by_alignment, by_name_alignment, by_alignment_name
  72 } sort_type;
  73
  74 extern sort_type sort_section;
  75
  76 struct wildcard_spec {
  77   const char *name;
  78   struct name_list *exclude_name_list;
  79   sort_type sorted;
  80 };
  81
  82 struct wildcard_list {
  83   struct wildcard_list *next;
  84   struct wildcard_spec spec;
  85 };
  86
  87 struct map_symbol_def {
  88   struct bfd_link_hash_entry *entry;
  89   struct map_symbol_def *next;
  90 };
  91
  92 /* Extra information we hold on sections */
  93 typedef struct lean_user_section_struct {
  94   /* For output sections: pointer to the section where this data will go.  */
  95   struct lang_input_statement_struct *file;
  96 } lean_section_userdata_type;
  97
  98 /* The initial part of fat_user_section_struct has to be idential with
  99    lean_user_section_struct.  */
 100 typedef struct fat_user_section_struct {
 101   /* For output sections: pointer to the section where this data will go.  */
 102   struct lang_input_statement_struct *file;
 103   /* For input sections, when writing a map file: head / tail of a linked
 104      list of hash table entries for symbols defined in this section.  */
 105   struct map_symbol_def *map_symbol_def_head;
 106   struct map_symbol_def **map_symbol_def_tail;
 107 } fat_section_userdata_type;
 108
 109 #define SECTION_USERDATA_SIZE \
 110  (command_line.reduce_memory_overheads \
 111   ? sizeof (lean_section_userdata_type) \
 112   : sizeof (fat_section_userdata_type))
 113
 114 #define get_userdata(x) ((x)->userdata)
 115
 116 #define BYTE_SIZE       (1)
 117 #define SHORT_SIZE      (2)
 118 #define LONG_SIZE       (4)
 119 #define QUAD_SIZE       (8)
 120
 121 typedef struct {
 122   /* 1 => assign space to common symbols even if `relocatable_output'.  */
 123   bfd_boolean force_common_definition;
 124
 125   /* 1 => do not assign addresses to common symbols.  */
 126   bfd_boolean inhibit_common_definition;
 127   bfd_boolean relax;
 128
 129   /* Name of runtime interpreter to invoke.  */
 130   char *interpreter;
 131
 132   /* Name to give runtime libary from the -soname argument.  */
 133   char *soname;
 134
 135   /* Runtime library search path from the -rpath argument.  */
 136   char *rpath;
 137
 138   /* Link time runtime library search path from the -rpath-link
 139      argument.  */
 140   char *rpath_link;
 141
 142   /* Big or little endian as set on command line.  */
 143   enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE } endian;
 144
 145   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 146      file.  */
 147   bfd_boolean embedded_relocs;
 148
 149   /* If TRUE, force generation of a file with a .exe file.  */
 150   bfd_boolean force_exe_suffix;
 151
 152   /* If TRUE, generate a cross reference report.  */
 153   bfd_boolean cref;
 154
 155   /* If TRUE (which is the default), warn about mismatched input
 156      files.  */
 157   bfd_boolean warn_mismatch;
 158
 159   /* Remove unreferenced sections?  */
 160   bfd_boolean gc_sections;
 161
 162   /* Name of shared object whose symbol table should be filtered with
 163      this shared object.  From the --filter option.  */
 164   char *filter_shlib;
 165
 166   /* Name of shared object for whose symbol table this shared object
 167      is an auxiliary filter.  From the --auxiliary option.  */
 168   char **auxiliary_filters;
 169
 170   /* A version symbol to be applied to the symbol names found in the
 171      .exports sections.  */
 172   char *version_exports_section;
 173
 174   /* If TRUE (the default) check section addresses, once compute,
 175      fpor overlaps.  */
 176   bfd_boolean check_section_addresses;
 177
 178   /* If TRUE allow the linking of input files in an unknown architecture
 179      assuming that the user knows what they are doing.  This was the old
 180      behaviour of the linker.  The new default behaviour is to reject such
 181      input files.  */
 182   bfd_boolean accept_unknown_input_arch;
 183
 184   /* If TRUE reduce memory overheads, at the expense of speed.
 185      This will cause map file generation to use an O(N^2) algorithm.  */
 186   bfd_boolean reduce_memory_overheads;
 187
 188 } args_type;
 189
 190 extern args_type command_line;
 191
 192 typedef int token_code_type;
 193
 194 typedef struct {
 195   bfd_size_type specified_data_size;
 196   bfd_boolean magic_demand_paged;
 197   bfd_boolean make_executable;
 198
 199   /* If TRUE, doing a dynamic link.  */
 200   bfd_boolean dynamic_link;
 201
 202   /* If TRUE, -shared is supported.  */
 203   /* ??? A better way to do this is perhaps to define this in the
 204      ld_emulation_xfer_struct since this is really a target dependent
 205      parameter.  */
 206   bfd_boolean has_shared;
 207
 208   /* If TRUE, build constructors.  */
 209   bfd_boolean build_constructors;
 210
 211   /* If TRUE, warn about any constructors.  */
 212   bfd_boolean warn_constructors;
 213
 214   /* If TRUE, warn about merging common symbols with others.  */
 215   bfd_boolean warn_common;
 216
 217   /* If TRUE, only warn once about a particular undefined symbol.  */
 218   bfd_boolean warn_once;
 219
 220   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 221      only).  */
 222   bfd_boolean warn_multiple_gp;
 223
 224   /* If TRUE, warn if the starting address of an output section
 225      changes due to the alignment of an input section.  */
 226   bfd_boolean warn_section_align;
 227
 228   /* If TRUE, warning messages are fatal */
 229   bfd_boolean fatal_warnings;
 230
 231   bfd_boolean sort_common;
 232
 233   bfd_boolean text_read_only;
 234
 235   char *map_filename;
 236   FILE *map_file;
 237
 238   bfd_boolean stats;
 239
 240   /* If set, orphan input sections will be mapped to separate output
 241      sections.  */
 242   bfd_boolean unique_orphan_sections;
 243
 244   unsigned int split_by_reloc;
 245   bfd_size_type split_by_file;
 246
 247   /* If set, only search library directories explicitly selected
 248      on the command line.  */
 249   bfd_boolean only_cmd_line_lib_dirs;
 250
 251   /* The size of the hash table to use.  */
 252   bfd_size_type hash_table_size;
 253 } ld_config_type;
 254
 255 extern ld_config_type config;
 256
 257 typedef enum {
 258   lang_first_phase_enum,
 259   lang_allocating_phase_enum,
 260   lang_final_phase_enum
 261 } lang_phase_type;
 262
 263 extern FILE * saved_script_handle;
 264 extern bfd_boolean force_make_executable;
 265
 266 /* Non-zero if we are processing a --defsym from the command line.  */
 267 extern int parsing_defsym;
 268
 269 extern int yyparse (void);
 270 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 271 extern void output_cref (FILE *);
 272 extern void check_nocrossrefs (void);
 273 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 274
 275 /* If gcc >= 2.6, we can give a function name, too.  */
 276 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 277 #define __PRETTY_FUNCTION__  NULL
 278 #endif
 279
 280 #undef abort
 281 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 282
 283 #endif