ld/ld.h

   1 /* ld.h -- general linker header file
   2    Copyright (C) 1991-2016 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU Binutils.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #ifndef LD_H
  22 #define LD_H
  23
  24 #ifdef HAVE_LOCALE_H
  25 #endif
  26 #ifndef SEEK_CUR
  27 #define SEEK_CUR 1
  28 #endif
  29 #ifndef SEEK_END
  30 #define SEEK_END 2
  31 #endif
  32
  33 #ifdef HAVE_LOCALE_H
  34 # ifndef ENABLE_NLS
  35    /* The Solaris version of locale.h always includes libintl.h.  If we have
  36       been configured with --disable-nls then ENABLE_NLS will not be defined
  37       and the dummy definitions of bindtextdomain (et al) below will conflict
  38       with the defintions in libintl.h.  So we define these values to prevent
  39       the bogus inclusion of libintl.h.  */
  40 #  define _LIBINTL_H
  41 #  define _LIBGETTEXT_H
  42 # endif
  43 # include <locale.h>
  44 #endif
  45
  46 #ifdef ENABLE_NLS
  47 # include <libintl.h>
  48 # define _(String) gettext (String)
  49 # ifdef gettext_noop
  50 #  define N_(String) gettext_noop (String)
  51 # else
  52 #  define N_(String) (String)
  53 # endif
  54 #else
  55 # define gettext(Msgid) (Msgid)
  56 # define dgettext(Domainname, Msgid) (Msgid)
  57 # define dcgettext(Domainname, Msgid, Category) (Msgid)
  58 # define textdomain(Domainname) while (0) /* nothing */
  59 # define bindtextdomain(Domainname, Dirname) while (0) /* nothing */
  60 # define _(String) (String)
  61 # define N_(String) (String)
  62 #endif
  63
  64 /* Look in this environment name for the linker to pretend to be */
  65 #define EMULATION_ENVIRON "LDEMULATION"
  66 /* If in there look for the strings: */
  67
  68 /* Look in this variable for a target format */
  69 #define TARGET_ENVIRON "GNUTARGET"
  70
  71 /* Input sections which are put in a section of this name are actually
  72    discarded.  */
  73 #define DISCARD_SECTION_NAME "/DISCARD/"
  74
  75 /* A file name list.  */
  76 typedef struct name_list
  77 {
  78   const char *name;
  79   struct name_list *next;
  80 }
  81 name_list;
  82
  83 typedef enum {sort_none, sort_ascending, sort_descending} sort_order;
  84
  85 /* A wildcard specification.  */
  86
  87 typedef enum
  88 {
  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 {
  97   const char *name;
  98   struct name_list *exclude_name_list;
  99   sort_type sorted;
 100   struct flag_info *section_flag_list;
 101 };
 102
 103 struct wildcard_list
 104 {
 105   struct wildcard_list *next;
 106   struct wildcard_spec spec;
 107 };
 108
 109 #define BYTE_SIZE       (1)
 110 #define SHORT_SIZE      (2)
 111 #define LONG_SIZE       (4)
 112 #define QUAD_SIZE       (8)
 113
 114 enum endian_enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE };
 115
 116 enum symbolic_enum
 117 {
 118   symbolic_unset = 0,
 119   symbolic,
 120   symbolic_functions,
 121 };
 122
 123 enum dynamic_list_enum
 124 {
 125   dynamic_list_unset = 0,
 126   dynamic_list_data,
 127   dynamic_list
 128 };
 129
 130 typedef struct
 131 {
 132   /* 1 => assign space to common symbols even if `relocatable_output'.  */
 133   bfd_boolean force_common_definition;
 134
 135   /* 1 => do not assign addresses to common symbols.  */
 136   bfd_boolean inhibit_common_definition;
 137
 138   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 139      file.  */
 140   bfd_boolean embedded_relocs;
 141
 142   /* If TRUE, force generation of a file with a .exe file.  */
 143   bfd_boolean force_exe_suffix;
 144
 145   /* If TRUE, generate a cross reference report.  */
 146   bfd_boolean cref;
 147
 148   /* If TRUE (which is the default), warn about mismatched input
 149      files.  */
 150   bfd_boolean warn_mismatch;
 151
 152   /* Warn on attempting to open an incompatible library during a library
 153      search.  */
 154   bfd_boolean warn_search_mismatch;
 155
 156   /* If non-zero check section addresses, once computed,
 157      for overlaps.  Relocatable links only check when this is > 0.  */
 158   signed char check_section_addresses;
 159
 160   /* If TRUE allow the linking of input files in an unknown architecture
 161      assuming that the user knows what they are doing.  This was the old
 162      behaviour of the linker.  The new default behaviour is to reject such
 163      input files.  */
 164   bfd_boolean accept_unknown_input_arch;
 165
 166   /* If TRUE we'll just print the default output on stdout.  */
 167   bfd_boolean print_output_format;
 168
 169   /* If set, display the target memory usage (per memory region).  */
 170   bfd_boolean print_memory_usage;
 171
 172   /* Big or little endian as set on command line.  */
 173   enum endian_enum endian;
 174
 175   /* -Bsymbolic and -Bsymbolic-functions, as set on command line.  */
 176   enum symbolic_enum symbolic;
 177
 178   /* --dynamic-list, --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo
 179      and --dynamic-list FILE, as set on command line.  */
 180   enum dynamic_list_enum dynamic_list;
 181
 182   /* Name of runtime interpreter to invoke.  */
 183   char *interpreter;
 184
 185   /* Name to give runtime libary from the -soname argument.  */
 186   char *soname;
 187
 188   /* Runtime library search path from the -rpath argument.  */
 189   char *rpath;
 190
 191   /* Link time runtime library search path from the -rpath-link
 192      argument.  */
 193   char *rpath_link;
 194
 195   /* Name of shared object whose symbol table should be filtered with
 196      this shared object.  From the --filter option.  */
 197   char *filter_shlib;
 198
 199   /* Name of shared object for whose symbol table this shared object
 200      is an auxiliary filter.  From the --auxiliary option.  */
 201   char **auxiliary_filters;
 202
 203   /* A version symbol to be applied to the symbol names found in the
 204      .exports sections.  */
 205   char *version_exports_section;
 206
 207   /* Default linker script.  */
 208   char *default_script;
 209 } args_type;
 210
 211 extern args_type command_line;
 212
 213 typedef int token_code_type;
 214
 215 /* Different ways we can handle orphan sections.  */
 216
 217 enum orphan_handling_enum
 218 {
 219   /* The classic strategy, find a suitable section to place the orphan
 220      into.  */
 221   orphan_handling_place = 0,
 222
 223   /* Discard any orphan sections as though they were assign to the section
 224      /DISCARD/.  */
 225   orphan_handling_discard,
 226
 227   /* Find somewhere to place the orphan section, as with
 228      ORPHAN_HANDLING_PLACE, but also issue a warning.  */
 229   orphan_handling_warn,
 230
 231   /* Issue a fatal error if any orphan sections are found.  */
 232   orphan_handling_error,
 233 };
 234
 235 typedef struct
 236 {
 237   bfd_boolean magic_demand_paged;
 238   bfd_boolean make_executable;
 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   /* How should we deal with orphan sections.  */
 259   enum orphan_handling_enum orphan_handling;
 260
 261   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 262      only).  */
 263   bfd_boolean warn_multiple_gp;
 264
 265   /* If TRUE, warn if the starting address of an output section
 266      changes due to the alignment of an input section.  */
 267   bfd_boolean warn_section_align;
 268
 269   /* If TRUE, warning messages are fatal */
 270   bfd_boolean fatal_warnings;
 271
 272   sort_order sort_common;
 273
 274   bfd_boolean text_read_only;
 275
 276   bfd_boolean stats;
 277
 278   /* If set, orphan input sections will be mapped to separate output
 279      sections.  */
 280   bfd_boolean unique_orphan_sections;
 281
 282   /* If set, only search library directories explicitly selected
 283      on the command line.  */
 284   bfd_boolean only_cmd_line_lib_dirs;
 285
 286   /* If set, numbers and absolute symbols are simply treated as
 287      numbers everywhere.  */
 288   bfd_boolean sane_expr;
 289
 290   /* If set, code and non-code sections should never be in one segment.  */
 291   bfd_boolean separate_code;
 292
 293   /* The rpath separation character.  Usually ':'.  */
 294   char rpath_separator;
 295
 296   char *map_filename;
 297   FILE *map_file;
 298
 299   unsigned int split_by_reloc;
 300   bfd_size_type split_by_file;
 301
 302   /* The size of the hash table to use.  */
 303   unsigned long hash_table_size;
 304
 305   /* The maximum page size for ELF.  */
 306   bfd_vma maxpagesize;
 307
 308   /* The common page size for ELF.  */
 309   bfd_vma commonpagesize;
 310 } ld_config_type;
 311
 312 extern ld_config_type config;
 313
 314 extern FILE * saved_script_handle;
 315 extern bfd_boolean force_make_executable;
 316
 317 extern int yyparse (void);
 318 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 319 extern bfd_boolean handle_asneeded_cref (bfd *, enum notice_asneeded_action);
 320 extern void output_cref (FILE *);
 321 extern void check_nocrossrefs (void);
 322 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 323
 324 /* If gcc >= 2.6, we can give a function name, too.  */
 325 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 326 #define __PRETTY_FUNCTION__  NULL
 327 #endif
 328
 329 #undef abort
 330 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 331
 332 #endif