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