ld/ld.h

   1 /* ld.h -- general linker header file
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2004
   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 2, 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 LD_H
  23 #define LD_H
  24
  25 #ifdef HAVE_LOCALE_H
  26 # include <locale.h>
  27 #endif
  28
  29 #ifdef ENABLE_NLS
  30 # include <libintl.h>
  31 # define _(String) gettext (String)
  32 # ifdef gettext_noop
  33 #  define N_(String) gettext_noop (String)
  34 # else
  35 #  define N_(String) (String)
  36 # endif
  37 #else
  38 # define gettext(Msgid) (Msgid)
  39 # define dgettext(Domainname, Msgid) (Msgid)
  40 # define dcgettext(Domainname, Msgid, Category) (Msgid)
  41 # define textdomain(Domainname) while (0) /* nothing */
  42 # define bindtextdomain(Domainname, Dirname) while (0) /* nothing */
  43 # define _(String) (String)
  44 # define N_(String) (String)
  45 #endif
  46
  47 #include "bin-bugs.h"
  48
  49 /* Look in this environment name for the linker to pretend to be */
  50 #define EMULATION_ENVIRON "LDEMULATION"
  51 /* If in there look for the strings: */
  52
  53 /* Look in this variable for a target format */
  54 #define TARGET_ENVIRON "GNUTARGET"
  55
  56 /* Input sections which are put in a section of this name are actually
  57    discarded.  */
  58 #define DISCARD_SECTION_NAME "/DISCARD/"
  59
  60 /* A file name list */
  61 typedef struct name_list {
  62   const char *name;
  63   struct name_list *next;
  64 }
  65 name_list;
  66
  67 /* A wildcard specification.  This is only used in ldgram.y, but it
  68    winds up in ldgram.h, so we need to define it outside.  */
  69
  70 struct wildcard_spec {
  71   const char *name;
  72   struct name_list *exclude_name_list;
  73   bfd_boolean sorted;
  74 };
  75
  76 struct wildcard_list {
  77   struct wildcard_list *next;
  78   struct wildcard_spec spec;
  79 };
  80
  81 struct map_symbol_def {
  82   struct bfd_link_hash_entry *entry;
  83   struct map_symbol_def *next;
  84 };
  85
  86 /* Extra information we hold on sections */
  87 typedef struct lean_user_section_struct {
  88   /* For output sections: pointer to the section where this data will go.  */
  89   struct lang_input_statement_struct *file;
  90 } lean_section_userdata_type;
  91
  92 /* The initial part of fat_user_section_struct has to be idential with
  93    lean_user_section_struct.  */
  94 typedef struct fat_user_section_struct {
  95   /* For output sections: pointer to the section where this data will go.  */
  96   struct lang_input_statement_struct *file;
  97   /* For input sections, when writing a map file: head / tail of a linked
  98      list of hash table entries for symbols defined in this section.  */
  99   struct map_symbol_def *map_symbol_def_head;
 100   struct map_symbol_def **map_symbol_def_tail;
 101 } fat_section_userdata_type;
 102
 103 #define SECTION_USERDATA_SIZE \
 104  (command_line.reduce_memory_overheads \
 105   ? sizeof (lean_section_userdata_type) \
 106   : sizeof (fat_section_userdata_type))
 107
 108 #define get_userdata(x) ((x)->userdata)
 109
 110 #define BYTE_SIZE       (1)
 111 #define SHORT_SIZE      (2)
 112 #define LONG_SIZE       (4)
 113 #define QUAD_SIZE       (8)
 114
 115 typedef struct {
 116   /* 1 => assign space to common symbols even if `relocatable_output'.  */
 117   bfd_boolean force_common_definition;
 118
 119   /* 1 => do not assign addresses to common symbols.  */
 120   bfd_boolean inhibit_common_definition;
 121   bfd_boolean relax;
 122
 123   /* Name of runtime interpreter to invoke.  */
 124   char *interpreter;
 125
 126   /* Name to give runtime libary from the -soname argument.  */
 127   char *soname;
 128
 129   /* Runtime library search path from the -rpath argument.  */
 130   char *rpath;
 131
 132   /* Link time runtime library search path from the -rpath-link
 133      argument.  */
 134   char *rpath_link;
 135
 136   /* Big or little endian as set on command line.  */
 137   enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE } endian;
 138
 139   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 140      file.  */
 141   bfd_boolean embedded_relocs;
 142
 143   /* If TRUE, force generation of a file with a .exe file.  */
 144   bfd_boolean force_exe_suffix;
 145
 146   /* If TRUE, generate a cross reference report.  */
 147   bfd_boolean cref;
 148
 149   /* If TRUE (which is the default), warn about mismatched input
 150      files.  */
 151   bfd_boolean warn_mismatch;
 152
 153   /* Remove unreferenced sections?  */
 154   bfd_boolean gc_sections;
 155
 156   /* Name of shared object whose symbol table should be filtered with
 157      this shared object.  From the --filter option.  */
 158   char *filter_shlib;
 159
 160   /* Name of shared object for whose symbol table this shared object
 161      is an auxiliary filter.  From the --auxiliary option.  */
 162   char **auxiliary_filters;
 163
 164   /* A version symbol to be applied to the symbol names found in the
 165      .exports sections.  */
 166   char *version_exports_section;
 167
 168   /* If TRUE (the default) check section addresses, once compute,
 169      fpor overlaps.  */
 170   bfd_boolean check_section_addresses;
 171
 172   /* If TRUE allow the linking of input files in an unknown architecture
 173      assuming that the user knows what they are doing.  This was the old
 174      behaviour of the linker.  The new default behaviour is to reject such
 175      input files.  */
 176   bfd_boolean accept_unknown_input_arch;
 177
 178   /* If TRUE reduce memory overheads, at the expense of speed.
 179      This will cause map file generation to use an O(N^2) algorithm.  */
 180   bfd_boolean reduce_memory_overheads;
 181
 182 } args_type;
 183
 184 extern args_type command_line;
 185
 186 typedef int token_code_type;
 187
 188 typedef struct {
 189   bfd_size_type specified_data_size;
 190   bfd_boolean magic_demand_paged;
 191   bfd_boolean make_executable;
 192
 193   /* If TRUE, doing a dynamic link.  */
 194   bfd_boolean dynamic_link;
 195
 196   /* If TRUE, -shared is supported.  */
 197   /* ??? A better way to do this is perhaps to define this in the
 198      ld_emulation_xfer_struct since this is really a target dependent
 199      parameter.  */
 200   bfd_boolean has_shared;
 201
 202   /* If TRUE, build constructors.  */
 203   bfd_boolean build_constructors;
 204
 205   /* If TRUE, warn about any constructors.  */
 206   bfd_boolean warn_constructors;
 207
 208   /* If TRUE, warn about merging common symbols with others.  */
 209   bfd_boolean warn_common;
 210
 211   /* If TRUE, only warn once about a particular undefined symbol.  */
 212   bfd_boolean warn_once;
 213
 214   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 215      only).  */
 216   bfd_boolean warn_multiple_gp;
 217
 218   /* If TRUE, warn if the starting address of an output section
 219      changes due to the alignment of an input section.  */
 220   bfd_boolean warn_section_align;
 221
 222   /* If TRUE, warning messages are fatal */
 223   bfd_boolean fatal_warnings;
 224
 225   bfd_boolean sort_common;
 226
 227   bfd_boolean text_read_only;
 228
 229   char *map_filename;
 230   FILE *map_file;
 231
 232   bfd_boolean stats;
 233
 234   /* If set, orphan input sections will be mapped to separate output
 235      sections.  */
 236   bfd_boolean unique_orphan_sections;
 237
 238   unsigned int split_by_reloc;
 239   bfd_size_type split_by_file;
 240
 241   /* If set, only search library directories explicitly selected
 242      on the command line.  */
 243   bfd_boolean only_cmd_line_lib_dirs;
 244
 245   /* The size of the hash table to use.  */
 246   bfd_size_type hash_table_size;
 247 } ld_config_type;
 248
 249 extern ld_config_type config;
 250
 251 typedef enum {
 252   lang_first_phase_enum,
 253   lang_allocating_phase_enum,
 254   lang_final_phase_enum
 255 } lang_phase_type;
 256
 257 extern FILE * saved_script_handle;
 258 extern bfd_boolean force_make_executable;
 259
 260 /* Non-zero if we are processing a --defsym from the command line.  */
 261 extern int parsing_defsym;
 262
 263 extern int yyparse (void);
 264 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 265 extern void output_cref (FILE *);
 266 extern void check_nocrossrefs (void);
 267 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 268
 269 /* If gcc >= 2.6, we can give a function name, too.  */
 270 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 271 #define __PRETTY_FUNCTION__  NULL
 272 #endif
 273
 274 #undef abort
 275 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 276
 277 #endif