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, 2010, 2011, 2012
   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   by_none, by_init_priority
  91 } sort_type;
  92
  93 extern sort_type sort_section;
  94
  95 struct wildcard_spec {
  96   const char *name;
  97   struct name_list *exclude_name_list;
  98   sort_type sorted;
  99   struct flag_info *section_flag_list;
 100 };
 101
 102 struct wildcard_list {
 103   struct wildcard_list *next;
 104   struct wildcard_spec spec;
 105 };
 106
 107 struct map_symbol_def {
 108   struct bfd_link_hash_entry *entry;
 109   struct map_symbol_def *next;
 110 };
 111
 112 /* The initial part of fat_user_section_struct has to be idential with
 113    lean_user_section_struct.  */
 114 typedef struct fat_user_section_struct {
 115   /* For input sections, when writing a map file: head / tail of a linked
 116      list of hash table entries for symbols defined in this section.  */
 117   struct map_symbol_def *map_symbol_def_head;
 118   struct map_symbol_def **map_symbol_def_tail;
 119   unsigned long map_symbol_def_count;
 120 } fat_section_userdata_type;
 121
 122 #define get_userdata(x) ((x)->userdata)
 123
 124 #define BYTE_SIZE       (1)
 125 #define SHORT_SIZE      (2)
 126 #define LONG_SIZE       (4)
 127 #define QUAD_SIZE       (8)
 128
 129 enum endian_enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE };
 130
 131 enum symbolic_enum
 132   {
 133     symbolic_unset = 0,
 134     symbolic,
 135     symbolic_functions,
 136   };
 137
 138 enum dynamic_list_enum
 139   {
 140     dynamic_list_unset = 0,
 141     dynamic_list_data,
 142     dynamic_list
 143   };
 144
 145 typedef struct {
 146   /* 1 => assign space to common symbols even if `relocatable_output'.  */
 147   bfd_boolean force_common_definition;
 148
 149   /* 1 => do not assign addresses to common symbols.  */
 150   bfd_boolean inhibit_common_definition;
 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   /* If TRUE we'll just print the default output on stdout.  */
 181   bfd_boolean print_output_format;
 182
 183   /* Big or little endian as set on command line.  */
 184   enum endian_enum endian;
 185
 186   /* -Bsymbolic and -Bsymbolic-functions, as set on command line.  */
 187   enum symbolic_enum symbolic;
 188
 189   /* --dynamic-list, --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo
 190      and --dynamic-list FILE, as set on command line.  */
 191   enum dynamic_list_enum dynamic_list;
 192
 193   /* Name of runtime interpreter to invoke.  */
 194   char *interpreter;
 195
 196   /* Name to give runtime libary from the -soname argument.  */
 197   char *soname;
 198
 199   /* Runtime library search path from the -rpath argument.  */
 200   char *rpath;
 201
 202   /* Link time runtime library search path from the -rpath-link
 203      argument.  */
 204   char *rpath_link;
 205
 206   /* Name of shared object whose symbol table should be filtered with
 207      this shared object.  From the --filter option.  */
 208   char *filter_shlib;
 209
 210   /* Name of shared object for whose symbol table this shared object
 211      is an auxiliary filter.  From the --auxiliary option.  */
 212   char **auxiliary_filters;
 213
 214   /* A version symbol to be applied to the symbol names found in the
 215      .exports sections.  */
 216   char *version_exports_section;
 217
 218   /* Default linker script.  */
 219   char *default_script;
 220 } args_type;
 221
 222 extern args_type command_line;
 223
 224 typedef int token_code_type;
 225
 226 typedef struct {
 227   bfd_boolean magic_demand_paged;
 228   bfd_boolean make_executable;
 229
 230   /* If TRUE, -shared is supported.  */
 231   /* ??? A better way to do this is perhaps to define this in the
 232      ld_emulation_xfer_struct since this is really a target dependent
 233      parameter.  */
 234   bfd_boolean has_shared;
 235
 236   /* If TRUE, build constructors.  */
 237   bfd_boolean build_constructors;
 238
 239   /* If TRUE, warn about any constructors.  */
 240   bfd_boolean warn_constructors;
 241
 242   /* If TRUE, warn about merging common symbols with others.  */
 243   bfd_boolean warn_common;
 244
 245   /* If TRUE, only warn once about a particular undefined symbol.  */
 246   bfd_boolean warn_once;
 247
 248   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 249      only).  */
 250   bfd_boolean warn_multiple_gp;
 251
 252   /* If TRUE, warn if the starting address of an output section
 253      changes due to the alignment of an input section.  */
 254   bfd_boolean warn_section_align;
 255
 256   /* If TRUE, warning messages are fatal */
 257   bfd_boolean fatal_warnings;
 258
 259   sort_order sort_common;
 260
 261   bfd_boolean text_read_only;
 262
 263   bfd_boolean stats;
 264
 265   /* If set, orphan input sections will be mapped to separate output
 266      sections.  */
 267   bfd_boolean unique_orphan_sections;
 268
 269   /* If set, only search library directories explicitly selected
 270      on the command line.  */
 271   bfd_boolean only_cmd_line_lib_dirs;
 272
 273   /* If set, numbers and absolute symbols are simply treated as
 274      numbers everywhere.  */
 275   bfd_boolean sane_expr;
 276
 277   /* If set, code and non-code sections should never be in one segment.  */
 278   bfd_boolean separate_code;
 279
 280   /* The rpath separation character.  Usually ':'.  */
 281   char rpath_separator;
 282
 283   char *map_filename;
 284   FILE *map_file;
 285
 286   unsigned int split_by_reloc;
 287   bfd_size_type split_by_file;
 288
 289   bfd_size_type specified_data_size;
 290
 291   /* The size of the hash table to use.  */
 292   unsigned long hash_table_size;
 293
 294   /* The maximum page size for ELF.  */
 295   bfd_vma maxpagesize;
 296
 297   /* The common page size for ELF.  */
 298   bfd_vma commonpagesize;
 299 } ld_config_type;
 300
 301 extern ld_config_type config;
 302
 303 extern FILE * saved_script_handle;
 304 extern bfd_boolean force_make_executable;
 305
 306 extern int yyparse (void);
 307 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 308 extern bfd_boolean handle_asneeded_cref (bfd *, enum notice_asneeded_action);
 309 extern void output_cref (FILE *);
 310 extern void check_nocrossrefs (void);
 311 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 312
 313 /* If gcc >= 2.6, we can give a function name, too.  */
 314 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 315 #define __PRETTY_FUNCTION__  NULL
 316 #endif
 317
 318 #undef abort
 319 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 320
 321 #endif