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 /* A wildcard specification.  */
 103
 104 typedef enum {
 105   none, by_name, by_alignment, by_name_alignment, by_alignment_name
 106 } sort_type;
 107
 108 extern sort_type sort_section;
 109
 110 struct wildcard_spec {
 111   const char *name;
 112   struct name_list *exclude_name_list;
 113   sort_type sorted;
 114 };
 115
 116 struct wildcard_list {
 117   struct wildcard_list *next;
 118   struct wildcard_spec spec;
 119 };
 120
 121 struct map_symbol_def {
 122   struct bfd_link_hash_entry *entry;
 123   struct map_symbol_def *next;
 124 };
 125
 126 /* The initial part of fat_user_section_struct has to be idential with
 127    lean_user_section_struct.  */
 128 typedef struct fat_user_section_struct {
 129   /* For input sections, when writing a map file: head / tail of a linked
 130      list of hash table entries for symbols defined in this section.  */
 131   struct map_symbol_def *map_symbol_def_head;
 132   struct map_symbol_def **map_symbol_def_tail;
 133 } fat_section_userdata_type;
 134
 135 #define get_userdata(x) ((x)->userdata)
 136
 137 #define BYTE_SIZE       (1)
 138 #define SHORT_SIZE      (2)
 139 #define LONG_SIZE       (4)
 140 #define QUAD_SIZE       (8)
 141
 142 typedef struct {
 143   /* 1 => assign space to common symbols even if `relocatable_output'.  */
 144   bfd_boolean force_common_definition;
 145
 146   /* 1 => do not assign addresses to common symbols.  */
 147   bfd_boolean inhibit_common_definition;
 148   bfd_boolean relax;
 149
 150   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 151      file.  */
 152   bfd_boolean embedded_relocs;
 153
 154   /* If TRUE, force generation of a file with a .exe file.  */
 155   bfd_boolean force_exe_suffix;
 156
 157   /* If TRUE, generate a cross reference report.  */
 158   bfd_boolean cref;
 159
 160   /* If TRUE (which is the default), warn about mismatched input
 161      files.  */
 162   bfd_boolean warn_mismatch;
 163
 164   /* Warn on attempting to open an incompatible library during a library
 165      search.  */
 166   bfd_boolean warn_search_mismatch;
 167
 168
 169   /* If TRUE (the default) check section addresses, once compute,
 170      fpor overlaps.  */
 171   bfd_boolean 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_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE } endian;
 181
 182   /* -Bsymbolic and -Bsymbolic-functions, as set on command line.  */
 183   enum
 184     {
 185       symbolic_unset = 0,
 186       symbolic,
 187       symbolic_functions,
 188     } symbolic;
 189
 190   /* --dynamic-list, --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo
 191      and --dynamic-list FILE, as set on command line.  */
 192   enum
 193     {
 194       dynamic_list_unset = 0,
 195       dynamic_list_data,
 196       dynamic_list
 197     } dynamic_list;
 198
 199   /* Name of runtime interpreter to invoke.  */
 200   char *interpreter;
 201
 202   /* Name to give runtime libary from the -soname argument.  */
 203   char *soname;
 204
 205   /* Runtime library search path from the -rpath argument.  */
 206   char *rpath;
 207
 208   /* Link time runtime library search path from the -rpath-link
 209      argument.  */
 210   char *rpath_link;
 211
 212   /* Name of shared object whose symbol table should be filtered with
 213      this shared object.  From the --filter option.  */
 214   char *filter_shlib;
 215
 216   /* Name of shared object for whose symbol table this shared object
 217      is an auxiliary filter.  From the --auxiliary option.  */
 218   char **auxiliary_filters;
 219
 220   /* A version symbol to be applied to the symbol names found in the
 221      .exports sections.  */
 222   char *version_exports_section;
 223
 224   /* Default linker script.  */
 225   char *default_script;
 226 } args_type;
 227
 228 extern args_type command_line;
 229
 230 typedef int token_code_type;
 231
 232 typedef struct {
 233   bfd_boolean magic_demand_paged;
 234   bfd_boolean make_executable;
 235
 236   /* If TRUE, doing a dynamic link.  */
 237   bfd_boolean dynamic_link;
 238
 239   /* If TRUE, -shared is supported.  */
 240   /* ??? A better way to do this is perhaps to define this in the
 241      ld_emulation_xfer_struct since this is really a target dependent
 242      parameter.  */
 243   bfd_boolean has_shared;
 244
 245   /* If TRUE, build constructors.  */
 246   bfd_boolean build_constructors;
 247
 248   /* If TRUE, warn about any constructors.  */
 249   bfd_boolean warn_constructors;
 250
 251   /* If TRUE, warn about merging common symbols with others.  */
 252   bfd_boolean warn_common;
 253
 254   /* If TRUE, only warn once about a particular undefined symbol.  */
 255   bfd_boolean warn_once;
 256
 257   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 258      only).  */
 259   bfd_boolean warn_multiple_gp;
 260
 261   /* If TRUE, warn if the starting address of an output section
 262      changes due to the alignment of an input section.  */
 263   bfd_boolean warn_section_align;
 264
 265   /* If TRUE, warning messages are fatal */
 266   bfd_boolean fatal_warnings;
 267
 268   bfd_boolean sort_common;
 269
 270   bfd_boolean text_read_only;
 271
 272   bfd_boolean stats;
 273
 274   /* If set, orphan input sections will be mapped to separate output
 275      sections.  */
 276   bfd_boolean unique_orphan_sections;
 277
 278   /* If set, only search library directories explicitly selected
 279      on the command line.  */
 280   bfd_boolean only_cmd_line_lib_dirs;
 281
 282   /* The rpath separation character.  Usually ':'.  */
 283   char rpath_separator;
 284
 285   char *map_filename;
 286   FILE *map_file;
 287
 288   unsigned int split_by_reloc;
 289   bfd_size_type split_by_file;
 290
 291   bfd_size_type specified_data_size;
 292
 293   /* The size of the hash table to use.  */
 294   bfd_size_type hash_table_size;
 295
 296   /* The maximum page size for ELF.  */
 297   bfd_vma maxpagesize;
 298
 299   /* The common page size for ELF.  */
 300   bfd_vma commonpagesize;
 301 } ld_config_type;
 302
 303 extern ld_config_type config;
 304
 305 extern FILE * saved_script_handle;
 306 extern bfd_boolean force_make_executable;
 307
 308 /* Non-zero if we are processing a --defsym from the command line.  */
 309 extern int parsing_defsym;
 310
 311 extern int yyparse (void);
 312 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 313 extern bfd_boolean handle_asneeded_cref (bfd *, enum notice_asneeded_action);
 314 extern void output_cref (FILE *);
 315 extern void check_nocrossrefs (void);
 316 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 317
 318 /* If gcc >= 2.6, we can give a function name, too.  */
 319 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 320 #define __PRETTY_FUNCTION__  NULL
 321 #endif
 322
 323 #undef abort
 324 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 325
 326 #endif