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, 2005
   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, 51 Franklin Street - Fifth Floor, Boston, MA
  21    02110-1301, USA.  */
  22
  23 #ifndef LD_H
  24 #define LD_H
  25
  26 #ifdef HAVE_LOCALE_H
  27 #endif
  28 #ifndef SEEK_CUR
  29 #define SEEK_CUR 1
  30 #endif
  31 #ifndef SEEK_END
  32 #define SEEK_END 2
  33 #endif
  34
  35 #if defined(__GNUC__) && !defined(C_ALLOCA)
  36 # undef alloca
  37 # define alloca __builtin_alloca
  38 #else
  39 # if defined(HAVE_ALLOCA_H) && !defined(C_ALLOCA)
  40 #  include <alloca.h>
  41 # else
  42 #  ifndef alloca /* predefined by HP cc +Olibcalls */
  43 #   if !defined (__STDC__) && !defined (__hpux)
  44 char *alloca ();
  45 #   else
  46 void *alloca ();
  47 #   endif /* __STDC__, __hpux */
  48 #  endif /* alloca */
  49 # endif /* HAVE_ALLOCA_H */
  50 #endif
  51
  52
  53 #ifdef HAVE_LOCALE_H
  54 # ifndef ENABLE_NLS
  55    /* The Solaris version of locale.h always includes libintl.h.  If we have
  56       been configured with --disable-nls then ENABLE_NLS will not be defined
  57       and the dummy definitions of bindtextdomain (et al) below will conflict
  58       with the defintions in libintl.h.  So we define these values to prevent
  59       the bogus inclusion of libintl.h.  */
  60 #  define _LIBINTL_H
  61 #  define _LIBGETTEXT_H
  62 # endif
  63 # include <locale.h>
  64 #endif
  65
  66 #ifdef ENABLE_NLS
  67 # include <libintl.h>
  68 # define _(String) gettext (String)
  69 # ifdef gettext_noop
  70 #  define N_(String) gettext_noop (String)
  71 # else
  72 #  define N_(String) (String)
  73 # endif
  74 #else
  75 # define gettext(Msgid) (Msgid)
  76 # define dgettext(Domainname, Msgid) (Msgid)
  77 # define dcgettext(Domainname, Msgid, Category) (Msgid)
  78 # define textdomain(Domainname) while (0) /* nothing */
  79 # define bindtextdomain(Domainname, Dirname) while (0) /* nothing */
  80 # define _(String) (String)
  81 # define N_(String) (String)
  82 #endif
  83
  84 #include "bin-bugs.h"
  85
  86 /* Look in this environment name for the linker to pretend to be */
  87 #define EMULATION_ENVIRON "LDEMULATION"
  88 /* If in there look for the strings: */
  89
  90 /* Look in this variable for a target format */
  91 #define TARGET_ENVIRON "GNUTARGET"
  92
  93 /* Input sections which are put in a section of this name are actually
  94    discarded.  */
  95 #define DISCARD_SECTION_NAME "/DISCARD/"
  96
  97 /* A file name list */
  98 typedef struct name_list {
  99   const char *name;
 100   struct name_list *next;
 101 }
 102 name_list;
 103
 104 /* A wildcard specification.  */
 105
 106 typedef enum {
 107   none, by_name, by_alignment, by_name_alignment, by_alignment_name
 108 } sort_type;
 109
 110 extern sort_type sort_section;
 111
 112 struct wildcard_spec {
 113   const char *name;
 114   struct name_list *exclude_name_list;
 115   sort_type sorted;
 116 };
 117
 118 struct wildcard_list {
 119   struct wildcard_list *next;
 120   struct wildcard_spec spec;
 121 };
 122
 123 struct map_symbol_def {
 124   struct bfd_link_hash_entry *entry;
 125   struct map_symbol_def *next;
 126 };
 127
 128 /* The initial part of fat_user_section_struct has to be idential with
 129    lean_user_section_struct.  */
 130 typedef struct fat_user_section_struct {
 131   /* For input sections, when writing a map file: head / tail of a linked
 132      list of hash table entries for symbols defined in this section.  */
 133   struct map_symbol_def *map_symbol_def_head;
 134   struct map_symbol_def **map_symbol_def_tail;
 135 } fat_section_userdata_type;
 136
 137 #define get_userdata(x) ((x)->userdata)
 138
 139 #define BYTE_SIZE       (1)
 140 #define SHORT_SIZE      (2)
 141 #define LONG_SIZE       (4)
 142 #define QUAD_SIZE       (8)
 143
 144 typedef struct {
 145   /* 1 => assign space to common symbols even if `relocatable_output'.  */
 146   bfd_boolean force_common_definition;
 147
 148   /* 1 => do not assign addresses to common symbols.  */
 149   bfd_boolean inhibit_common_definition;
 150   bfd_boolean relax;
 151
 152   /* Name of runtime interpreter to invoke.  */
 153   char *interpreter;
 154
 155   /* Name to give runtime libary from the -soname argument.  */
 156   char *soname;
 157
 158   /* Runtime library search path from the -rpath argument.  */
 159   char *rpath;
 160
 161   /* Link time runtime library search path from the -rpath-link
 162      argument.  */
 163   char *rpath_link;
 164
 165   /* Big or little endian as set on command line.  */
 166   enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE } endian;
 167
 168   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 169      file.  */
 170   bfd_boolean embedded_relocs;
 171
 172   /* If TRUE, force generation of a file with a .exe file.  */
 173   bfd_boolean force_exe_suffix;
 174
 175   /* If TRUE, generate a cross reference report.  */
 176   bfd_boolean cref;
 177
 178   /* If TRUE (which is the default), warn about mismatched input
 179      files.  */
 180   bfd_boolean warn_mismatch;
 181
 182   /* Name of shared object whose symbol table should be filtered with
 183      this shared object.  From the --filter option.  */
 184   char *filter_shlib;
 185
 186   /* Name of shared object for whose symbol table this shared object
 187      is an auxiliary filter.  From the --auxiliary option.  */
 188   char **auxiliary_filters;
 189
 190   /* A version symbol to be applied to the symbol names found in the
 191      .exports sections.  */
 192   char *version_exports_section;
 193
 194   /* If TRUE (the default) check section addresses, once compute,
 195      fpor overlaps.  */
 196   bfd_boolean check_section_addresses;
 197
 198   /* If TRUE allow the linking of input files in an unknown architecture
 199      assuming that the user knows what they are doing.  This was the old
 200      behaviour of the linker.  The new default behaviour is to reject such
 201      input files.  */
 202   bfd_boolean accept_unknown_input_arch;
 203
 204   /* If TRUE reduce memory overheads, at the expense of speed.
 205      This will cause map file generation to use an O(N^2) algorithm.  */
 206   bfd_boolean reduce_memory_overheads;
 207
 208 } args_type;
 209
 210 extern args_type command_line;
 211
 212 typedef int token_code_type;
 213
 214 typedef struct {
 215   bfd_size_type specified_data_size;
 216   bfd_boolean magic_demand_paged;
 217   bfd_boolean make_executable;
 218
 219   /* If TRUE, doing a dynamic link.  */
 220   bfd_boolean dynamic_link;
 221
 222   /* If TRUE, -shared is supported.  */
 223   /* ??? A better way to do this is perhaps to define this in the
 224      ld_emulation_xfer_struct since this is really a target dependent
 225      parameter.  */
 226   bfd_boolean has_shared;
 227
 228   /* If TRUE, build constructors.  */
 229   bfd_boolean build_constructors;
 230
 231   /* If TRUE, warn about any constructors.  */
 232   bfd_boolean warn_constructors;
 233
 234   /* If TRUE, warn about merging common symbols with others.  */
 235   bfd_boolean warn_common;
 236
 237   /* If TRUE, only warn once about a particular undefined symbol.  */
 238   bfd_boolean warn_once;
 239
 240   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 241      only).  */
 242   bfd_boolean warn_multiple_gp;
 243
 244   /* If TRUE, warn if the starting address of an output section
 245      changes due to the alignment of an input section.  */
 246   bfd_boolean warn_section_align;
 247
 248   /* If TRUE, warning messages are fatal */
 249   bfd_boolean fatal_warnings;
 250
 251   bfd_boolean sort_common;
 252
 253   bfd_boolean text_read_only;
 254
 255   char *map_filename;
 256   FILE *map_file;
 257
 258   bfd_boolean stats;
 259
 260   /* If set, orphan input sections will be mapped to separate output
 261      sections.  */
 262   bfd_boolean unique_orphan_sections;
 263
 264   unsigned int split_by_reloc;
 265   bfd_size_type split_by_file;
 266
 267   /* If set, only search library directories explicitly selected
 268      on the command line.  */
 269   bfd_boolean only_cmd_line_lib_dirs;
 270
 271   /* The size of the hash table to use.  */
 272   bfd_size_type hash_table_size;
 273
 274   /* The maximum page size for ELF.  */
 275   bfd_vma maxpagesize;
 276
 277   /* The common page size for ELF.  */
 278   bfd_vma commonpagesize;
 279 } ld_config_type;
 280
 281 extern ld_config_type config;
 282
 283 extern FILE * saved_script_handle;
 284 extern bfd_boolean force_make_executable;
 285
 286 /* Non-zero if we are processing a --defsym from the command line.  */
 287 extern int parsing_defsym;
 288
 289 extern int yyparse (void);
 290 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 291 extern void output_cref (FILE *);
 292 extern void check_nocrossrefs (void);
 293 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 294
 295 /* If gcc >= 2.6, we can give a function name, too.  */
 296 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 297 #define __PRETTY_FUNCTION__  NULL
 298 #endif
 299
 300 #undef abort
 301 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 302
 303 #endif