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
   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 #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 /* Look in this environment name for the linker to pretend to be */
  85 #define EMULATION_ENVIRON "LDEMULATION"
  86 /* If in there look for the strings: */
  87
  88 /* Look in this variable for a target format */
  89 #define TARGET_ENVIRON "GNUTARGET"
  90
  91 /* Input sections which are put in a section of this name are actually
  92    discarded.  */
  93 #define DISCARD_SECTION_NAME "/DISCARD/"
  94
  95 /* A file name list */
  96 typedef struct name_list {
  97   const char *name;
  98   struct name_list *next;
  99 }
 100 name_list;
 101
 102 typedef enum {sort_none, sort_ascending, sort_descending} sort_order;
 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   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 153      file.  */
 154   bfd_boolean embedded_relocs;
 155
 156   /* If TRUE, force generation of a file with a .exe file.  */
 157   bfd_boolean force_exe_suffix;
 158
 159   /* If TRUE, generate a cross reference report.  */
 160   bfd_boolean cref;
 161
 162   /* If TRUE (which is the default), warn about mismatched input
 163      files.  */
 164   bfd_boolean warn_mismatch;
 165
 166   /* Warn on attempting to open an incompatible library during a library
 167      search.  */
 168   bfd_boolean warn_search_mismatch;
 169
 170
 171   /* If TRUE (the default) check section addresses, once compute,
 172      fpor overlaps.  */
 173   bfd_boolean check_section_addresses;
 174
 175   /* If TRUE allow the linking of input files in an unknown architecture
 176      assuming that the user knows what they are doing.  This was the old
 177      behaviour of the linker.  The new default behaviour is to reject such
 178      input files.  */
 179   bfd_boolean accept_unknown_input_arch;
 180
 181   /* Big or little endian as set on command line.  */
 182   enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE } endian;
 183
 184   /* -Bsymbolic and -Bsymbolic-functions, as set on command line.  */
 185   enum
 186     {
 187       symbolic_unset = 0,
 188       symbolic,
 189       symbolic_functions,
 190     } symbolic;
 191
 192   /* --dynamic-list, --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo
 193      and --dynamic-list FILE, as set on command line.  */
 194   enum
 195     {
 196       dynamic_list_unset = 0,
 197       dynamic_list_data,
 198       dynamic_list
 199     } dynamic_list;
 200
 201   /* Name of runtime interpreter to invoke.  */
 202   char *interpreter;
 203
 204   /* Name to give runtime libary from the -soname argument.  */
 205   char *soname;
 206
 207   /* Runtime library search path from the -rpath argument.  */
 208   char *rpath;
 209
 210   /* Link time runtime library search path from the -rpath-link
 211      argument.  */
 212   char *rpath_link;
 213
 214   /* Name of shared object whose symbol table should be filtered with
 215      this shared object.  From the --filter option.  */
 216   char *filter_shlib;
 217
 218   /* Name of shared object for whose symbol table this shared object
 219      is an auxiliary filter.  From the --auxiliary option.  */
 220   char **auxiliary_filters;
 221
 222   /* A version symbol to be applied to the symbol names found in the
 223      .exports sections.  */
 224   char *version_exports_section;
 225
 226   /* Default linker script.  */
 227   char *default_script;
 228 } args_type;
 229
 230 extern args_type command_line;
 231
 232 typedef int token_code_type;
 233
 234 typedef struct {
 235   bfd_boolean magic_demand_paged;
 236   bfd_boolean make_executable;
 237
 238   /* If TRUE, doing a dynamic link.  */
 239   bfd_boolean dynamic_link;
 240
 241   /* If TRUE, -shared is supported.  */
 242   /* ??? A better way to do this is perhaps to define this in the
 243      ld_emulation_xfer_struct since this is really a target dependent
 244      parameter.  */
 245   bfd_boolean has_shared;
 246
 247   /* If TRUE, build constructors.  */
 248   bfd_boolean build_constructors;
 249
 250   /* If TRUE, warn about any constructors.  */
 251   bfd_boolean warn_constructors;
 252
 253   /* If TRUE, warn about merging common symbols with others.  */
 254   bfd_boolean warn_common;
 255
 256   /* If TRUE, only warn once about a particular undefined symbol.  */
 257   bfd_boolean warn_once;
 258
 259   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 260      only).  */
 261   bfd_boolean warn_multiple_gp;
 262
 263   /* If TRUE, warn if the starting address of an output section
 264      changes due to the alignment of an input section.  */
 265   bfd_boolean warn_section_align;
 266
 267   /* If TRUE, warning messages are fatal */
 268   bfd_boolean fatal_warnings;
 269
 270   sort_order sort_common;
 271
 272   bfd_boolean text_read_only;
 273
 274   bfd_boolean stats;
 275
 276   /* If set, orphan input sections will be mapped to separate output
 277      sections.  */
 278   bfd_boolean unique_orphan_sections;
 279
 280   /* If set, only search library directories explicitly selected
 281      on the command line.  */
 282   bfd_boolean only_cmd_line_lib_dirs;
 283
 284   /* The rpath separation character.  Usually ':'.  */
 285   char rpath_separator;
 286
 287   char *map_filename;
 288   FILE *map_file;
 289
 290   unsigned int split_by_reloc;
 291   bfd_size_type split_by_file;
 292
 293   bfd_size_type specified_data_size;
 294
 295   /* The size of the hash table to use.  */
 296   bfd_size_type hash_table_size;
 297
 298   /* The maximum page size for ELF.  */
 299   bfd_vma maxpagesize;
 300
 301   /* The common page size for ELF.  */
 302   bfd_vma commonpagesize;
 303 } ld_config_type;
 304
 305 extern ld_config_type config;
 306
 307 extern FILE * saved_script_handle;
 308 extern bfd_boolean force_make_executable;
 309
 310 /* Non-zero if we are processing a --defsym from the command line.  */
 311 extern int parsing_defsym;
 312
 313 extern int yyparse (void);
 314 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 315 extern bfd_boolean handle_asneeded_cref (bfd *, enum notice_asneeded_action);
 316 extern void output_cref (FILE *);
 317 extern void check_nocrossrefs (void);
 318 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 319
 320 /* If gcc >= 2.6, we can give a function name, too.  */
 321 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 322 #define __PRETTY_FUNCTION__  NULL
 323 #endif
 324
 325 #undef abort
 326 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 327
 328 #endif