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   /* Enable or disable target specific optimizations.
 153
 154      Not all targets have optimizations to enable.
 155
 156      Normally these optimizations are disabled by default but some targets
 157      prefer to enable them by default.  So this field is a tri-state variable.
 158      The values are:
 159
 160      zero: Enable the optimizations (either from --relax being specified on
 161        the command line or the backend's before_allocation emulation function.
 162
 163      positive: The user has requested that these optimizations be disabled.
 164        (Via the --no-relax command line option).
 165
 166      negative: The optimizations are disabled.  (Set when initializing the
 167        args_type structure in ldmain.c:main.  */
 168   signed int disable_target_specific_optimizations;
 169 #define RELAXATION_DISABLED_BY_DEFAULT (command_line.disable_target_specific_optimizations < 0)
 170 #define RELAXATION_DISABLED_BY_USER    (command_line.disable_target_specific_optimizations > 0)
 171 #define RELAXATION_ENABLED (command_line.disable_target_specific_optimizations == 0)
 172 #define DISABLE_RELAXATION do { command_line.disable_target_specific_optimizations = 1; } while (0)
 173 #define ENABLE_RELAXATION  do { command_line.disable_target_specific_optimizations = 0; } while (0)
 174
 175   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 176      file.  */
 177   bfd_boolean embedded_relocs;
 178
 179   /* If TRUE, force generation of a file with a .exe file.  */
 180   bfd_boolean force_exe_suffix;
 181
 182   /* If TRUE, generate a cross reference report.  */
 183   bfd_boolean cref;
 184
 185   /* If TRUE (which is the default), warn about mismatched input
 186      files.  */
 187   bfd_boolean warn_mismatch;
 188
 189   /* Warn on attempting to open an incompatible library during a library
 190      search.  */
 191   bfd_boolean warn_search_mismatch;
 192
 193   /* If non-zero check section addresses, once computed,
 194      for overlaps.  Relocatable links only check when this is > 0.  */
 195   signed char check_section_addresses;
 196
 197   /* If TRUE allow the linking of input files in an unknown architecture
 198      assuming that the user knows what they are doing.  This was the old
 199      behaviour of the linker.  The new default behaviour is to reject such
 200      input files.  */
 201   bfd_boolean accept_unknown_input_arch;
 202
 203   /* If TRUE we'll just print the default output on stdout.  */
 204   bfd_boolean print_output_format;
 205
 206   /* Big or little endian as set on command line.  */
 207   enum endian_enum endian;
 208
 209   /* -Bsymbolic and -Bsymbolic-functions, as set on command line.  */
 210   enum symbolic_enum symbolic;
 211
 212   /* --dynamic-list, --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo
 213      and --dynamic-list FILE, as set on command line.  */
 214   enum dynamic_list_enum dynamic_list;
 215
 216   /* Name of runtime interpreter to invoke.  */
 217   char *interpreter;
 218
 219   /* Name to give runtime libary from the -soname argument.  */
 220   char *soname;
 221
 222   /* Runtime library search path from the -rpath argument.  */
 223   char *rpath;
 224
 225   /* Link time runtime library search path from the -rpath-link
 226      argument.  */
 227   char *rpath_link;
 228
 229   /* Name of shared object whose symbol table should be filtered with
 230      this shared object.  From the --filter option.  */
 231   char *filter_shlib;
 232
 233   /* Name of shared object for whose symbol table this shared object
 234      is an auxiliary filter.  From the --auxiliary option.  */
 235   char **auxiliary_filters;
 236
 237   /* A version symbol to be applied to the symbol names found in the
 238      .exports sections.  */
 239   char *version_exports_section;
 240
 241   /* Default linker script.  */
 242   char *default_script;
 243 } args_type;
 244
 245 extern args_type command_line;
 246
 247 typedef int token_code_type;
 248
 249 typedef struct {
 250   bfd_boolean magic_demand_paged;
 251   bfd_boolean make_executable;
 252
 253   /* If TRUE, -shared is supported.  */
 254   /* ??? A better way to do this is perhaps to define this in the
 255      ld_emulation_xfer_struct since this is really a target dependent
 256      parameter.  */
 257   bfd_boolean has_shared;
 258
 259   /* If TRUE, build constructors.  */
 260   bfd_boolean build_constructors;
 261
 262   /* If TRUE, warn about any constructors.  */
 263   bfd_boolean warn_constructors;
 264
 265   /* If TRUE, warn about merging common symbols with others.  */
 266   bfd_boolean warn_common;
 267
 268   /* If TRUE, only warn once about a particular undefined symbol.  */
 269   bfd_boolean warn_once;
 270
 271   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 272      only).  */
 273   bfd_boolean warn_multiple_gp;
 274
 275   /* If TRUE, warn if the starting address of an output section
 276      changes due to the alignment of an input section.  */
 277   bfd_boolean warn_section_align;
 278
 279   /* If TRUE, warning messages are fatal */
 280   bfd_boolean fatal_warnings;
 281
 282   sort_order sort_common;
 283
 284   bfd_boolean text_read_only;
 285
 286   bfd_boolean stats;
 287
 288   /* If set, orphan input sections will be mapped to separate output
 289      sections.  */
 290   bfd_boolean unique_orphan_sections;
 291
 292   /* If set, only search library directories explicitly selected
 293      on the command line.  */
 294   bfd_boolean only_cmd_line_lib_dirs;
 295
 296   /* If set, numbers and absolute symbols are simply treated as
 297      numbers everywhere.  */
 298   bfd_boolean sane_expr;
 299
 300   /* The rpath separation character.  Usually ':'.  */
 301   char rpath_separator;
 302
 303   char *map_filename;
 304   FILE *map_file;
 305
 306   unsigned int split_by_reloc;
 307   bfd_size_type split_by_file;
 308
 309   bfd_size_type specified_data_size;
 310
 311   /* The size of the hash table to use.  */
 312   unsigned long hash_table_size;
 313
 314   /* The maximum page size for ELF.  */
 315   bfd_vma maxpagesize;
 316
 317   /* The common page size for ELF.  */
 318   bfd_vma commonpagesize;
 319 } ld_config_type;
 320
 321 extern ld_config_type config;
 322
 323 extern FILE * saved_script_handle;
 324 extern bfd_boolean force_make_executable;
 325
 326 extern int yyparse (void);
 327 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 328 extern bfd_boolean handle_asneeded_cref (bfd *, enum notice_asneeded_action);
 329 extern void output_cref (FILE *);
 330 extern void check_nocrossrefs (void);
 331 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 332
 333 /* If gcc >= 2.6, we can give a function name, too.  */
 334 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 335 #define __PRETTY_FUNCTION__  NULL
 336 #endif
 337
 338 #undef abort
 339 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 340
 341 #endif