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, 2006, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5
   6    This file is part of the GNU Binutils.
   7
   8    This program 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 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program 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 this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 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 #ifdef HAVE_LOCALE_H
  36 # ifndef ENABLE_NLS
  37    /* The Solaris version of locale.h always includes libintl.h.  If we have
  38       been configured with --disable-nls then ENABLE_NLS will not be defined
  39       and the dummy definitions of bindtextdomain (et al) below will conflict
  40       with the defintions in libintl.h.  So we define these values to prevent
  41       the bogus inclusion of libintl.h.  */
  42 #  define _LIBINTL_H
  43 #  define _LIBGETTEXT_H
  44 # endif
  45 # include <locale.h>
  46 #endif
  47
  48 #ifdef ENABLE_NLS
  49 # include <libintl.h>
  50 # define _(String) gettext (String)
  51 # ifdef gettext_noop
  52 #  define N_(String) gettext_noop (String)
  53 # else
  54 #  define N_(String) (String)
  55 # endif
  56 #else
  57 # define gettext(Msgid) (Msgid)
  58 # define dgettext(Domainname, Msgid) (Msgid)
  59 # define dcgettext(Domainname, Msgid, Category) (Msgid)
  60 # define textdomain(Domainname) while (0) /* nothing */
  61 # define bindtextdomain(Domainname, Dirname) while (0) /* nothing */
  62 # define _(String) (String)
  63 # define N_(String) (String)
  64 #endif
  65
  66 /* Look in this environment name for the linker to pretend to be */
  67 #define EMULATION_ENVIRON "LDEMULATION"
  68 /* If in there look for the strings: */
  69
  70 /* Look in this variable for a target format */
  71 #define TARGET_ENVIRON "GNUTARGET"
  72
  73 /* Input sections which are put in a section of this name are actually
  74    discarded.  */
  75 #define DISCARD_SECTION_NAME "/DISCARD/"
  76
  77 /* A file name list */
  78 typedef struct name_list {
  79   const char *name;
  80   struct name_list *next;
  81 }
  82 name_list;
  83
  84 typedef enum {sort_none, sort_ascending, sort_descending} sort_order;
  85
  86 /* A wildcard specification.  */
  87
  88 typedef enum {
  89   none, by_name, by_alignment, by_name_alignment, by_alignment_name
  90 } sort_type;
  91
  92 extern sort_type sort_section;
  93
  94 struct wildcard_spec {
  95   const char *name;
  96   struct name_list *exclude_name_list;
  97   sort_type sorted;
  98 };
  99
 100 struct wildcard_list {
 101   struct wildcard_list *next;
 102   struct wildcard_spec spec;
 103 };
 104
 105 struct map_symbol_def {
 106   struct bfd_link_hash_entry *entry;
 107   struct map_symbol_def *next;
 108 };
 109
 110 /* The initial part of fat_user_section_struct has to be idential with
 111    lean_user_section_struct.  */
 112 typedef struct fat_user_section_struct {
 113   /* For input sections, when writing a map file: head / tail of a linked
 114      list of hash table entries for symbols defined in this section.  */
 115   struct map_symbol_def *map_symbol_def_head;
 116   struct map_symbol_def **map_symbol_def_tail;
 117   unsigned long map_symbol_def_count;
 118 } fat_section_userdata_type;
 119
 120 #define get_userdata(x) ((x)->userdata)
 121
 122 #define BYTE_SIZE       (1)
 123 #define SHORT_SIZE      (2)
 124 #define LONG_SIZE       (4)
 125 #define QUAD_SIZE       (8)
 126
 127 enum endian_enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE };
 128
 129 enum symbolic_enum
 130   {
 131     symbolic_unset = 0,
 132     symbolic,
 133     symbolic_functions,
 134   };
 135
 136 enum dynamic_list_enum
 137   {
 138     dynamic_list_unset = 0,
 139     dynamic_list_data,
 140     dynamic_list
 141   };
 142
 143 typedef struct {
 144   /* 1 => assign space to common symbols even if `relocatable_output'.  */
 145   bfd_boolean force_common_definition;
 146
 147   /* 1 => do not assign addresses to common symbols.  */
 148   bfd_boolean inhibit_common_definition;
 149   bfd_boolean relax;
 150
 151   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 152      file.  */
 153   bfd_boolean embedded_relocs;
 154
 155   /* If TRUE, force generation of a file with a .exe file.  */
 156   bfd_boolean force_exe_suffix;
 157
 158   /* If TRUE, generate a cross reference report.  */
 159   bfd_boolean cref;
 160
 161   /* If TRUE (which is the default), warn about mismatched input
 162      files.  */
 163   bfd_boolean warn_mismatch;
 164
 165   /* Warn on attempting to open an incompatible library during a library
 166      search.  */
 167   bfd_boolean warn_search_mismatch;
 168
 169   /* If non-zero check section addresses, once computed,
 170      for overlaps.  Relocatable links only check when this is > 0.  */
 171   signed char check_section_addresses;
 172
 173   /* If TRUE allow the linking of input files in an unknown architecture
 174      assuming that the user knows what they are doing.  This was the old
 175      behaviour of the linker.  The new default behaviour is to reject such
 176      input files.  */
 177   bfd_boolean accept_unknown_input_arch;
 178
 179   /* Big or little endian as set on command line.  */
 180   enum endian_enum endian;
 181
 182   /* -Bsymbolic and -Bsymbolic-functions, as set on command line.  */
 183   enum symbolic_enum symbolic;
 184
 185   /* --dynamic-list, --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo
 186      and --dynamic-list FILE, as set on command line.  */
 187   enum dynamic_list_enum dynamic_list;
 188
 189   /* Name of runtime interpreter to invoke.  */
 190   char *interpreter;
 191
 192   /* Name to give runtime libary from the -soname argument.  */
 193   char *soname;
 194
 195   /* Runtime library search path from the -rpath argument.  */
 196   char *rpath;
 197
 198   /* Link time runtime library search path from the -rpath-link
 199      argument.  */
 200   char *rpath_link;
 201
 202   /* Name of shared object whose symbol table should be filtered with
 203      this shared object.  From the --filter option.  */
 204   char *filter_shlib;
 205
 206   /* Name of shared object for whose symbol table this shared object
 207      is an auxiliary filter.  From the --auxiliary option.  */
 208   char **auxiliary_filters;
 209
 210   /* A version symbol to be applied to the symbol names found in the
 211      .exports sections.  */
 212   char *version_exports_section;
 213
 214   /* Default linker script.  */
 215   char *default_script;
 216 } args_type;
 217
 218 extern args_type command_line;
 219
 220 typedef int token_code_type;
 221
 222 typedef struct {
 223   bfd_boolean magic_demand_paged;
 224   bfd_boolean make_executable;
 225
 226   /* If TRUE, doing a dynamic link.  */
 227   bfd_boolean dynamic_link;
 228
 229   /* If TRUE, -shared is supported.  */
 230   /* ??? A better way to do this is perhaps to define this in the
 231      ld_emulation_xfer_struct since this is really a target dependent
 232      parameter.  */
 233   bfd_boolean has_shared;
 234
 235   /* If TRUE, build constructors.  */
 236   bfd_boolean build_constructors;
 237
 238   /* If TRUE, warn about any constructors.  */
 239   bfd_boolean warn_constructors;
 240
 241   /* If TRUE, warn about merging common symbols with others.  */
 242   bfd_boolean warn_common;
 243
 244   /* If TRUE, only warn once about a particular undefined symbol.  */
 245   bfd_boolean warn_once;
 246
 247   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 248      only).  */
 249   bfd_boolean warn_multiple_gp;
 250
 251   /* If TRUE, warn if the starting address of an output section
 252      changes due to the alignment of an input section.  */
 253   bfd_boolean warn_section_align;
 254
 255   /* If TRUE, warning messages are fatal */
 256   bfd_boolean fatal_warnings;
 257
 258   sort_order sort_common;
 259
 260   bfd_boolean text_read_only;
 261
 262   bfd_boolean stats;
 263
 264   /* If set, orphan input sections will be mapped to separate output
 265      sections.  */
 266   bfd_boolean unique_orphan_sections;
 267
 268   /* If set, only search library directories explicitly selected
 269      on the command line.  */
 270   bfd_boolean only_cmd_line_lib_dirs;
 271
 272   /* The rpath separation character.  Usually ':'.  */
 273   char rpath_separator;
 274
 275   char *map_filename;
 276   FILE *map_file;
 277
 278   unsigned int split_by_reloc;
 279   bfd_size_type split_by_file;
 280
 281   bfd_size_type specified_data_size;
 282
 283   /* The size of the hash table to use.  */
 284   bfd_size_type hash_table_size;
 285
 286   /* The maximum page size for ELF.  */
 287   bfd_vma maxpagesize;
 288
 289   /* The common page size for ELF.  */
 290   bfd_vma commonpagesize;
 291 } ld_config_type;
 292
 293 extern ld_config_type config;
 294
 295 extern FILE * saved_script_handle;
 296 extern bfd_boolean force_make_executable;
 297
 298 /* Non-zero if we are processing a --defsym from the command line.  */
 299 extern int parsing_defsym;
 300
 301 extern int yyparse (void);
 302 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 303 extern bfd_boolean handle_asneeded_cref (bfd *, enum notice_asneeded_action);
 304 extern void output_cref (FILE *);
 305 extern void check_nocrossrefs (void);
 306 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 307
 308 /* If gcc >= 2.6, we can give a function name, too.  */
 309 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 310 #define __PRETTY_FUNCTION__  NULL
 311 #endif
 312
 313 #undef abort
 314 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 315
 316 #endif