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   const char *name;
  78   struct name_list *next;
  79 }
  80 name_list;
  81
  82 typedef enum {sort_none, sort_ascending, sort_descending} sort_order;
  83
  84 /* A wildcard specification.  */
  85
  86 typedef enum {
  87   none, by_name, by_alignment, by_name_alignment, by_alignment_name,
  88   by_none, by_init_priority
  89 } sort_type;
  90
  91 extern sort_type sort_section;
  92
  93 struct wildcard_spec {
  94   const char *name;
  95   struct name_list *exclude_name_list;
  96   sort_type sorted;
  97   struct flag_info *section_flag_list;
  98 };
  99
 100 struct wildcard_list {
 101   struct wildcard_list *next;
 102   struct wildcard_spec spec;
 103 };
 104
 105 #define BYTE_SIZE       (1)
 106 #define SHORT_SIZE      (2)
 107 #define LONG_SIZE       (4)
 108 #define QUAD_SIZE       (8)
 109
 110 enum endian_enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE };
 111
 112 enum symbolic_enum
 113   {
 114     symbolic_unset = 0,
 115     symbolic,
 116     symbolic_functions,
 117   };
 118
 119 enum dynamic_list_enum
 120   {
 121     dynamic_list_unset = 0,
 122     dynamic_list_data,
 123     dynamic_list
 124   };
 125
 126 typedef struct {
 127   /* 1 => assign space to common symbols even if `relocatable_output'.  */
 128   bfd_boolean force_common_definition;
 129
 130   /* 1 => do not assign addresses to common symbols.  */
 131   bfd_boolean inhibit_common_definition;
 132
 133   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 134      file.  */
 135   bfd_boolean embedded_relocs;
 136
 137   /* If TRUE, force generation of a file with a .exe file.  */
 138   bfd_boolean force_exe_suffix;
 139
 140   /* If TRUE, generate a cross reference report.  */
 141   bfd_boolean cref;
 142
 143   /* If TRUE (which is the default), warn about mismatched input
 144      files.  */
 145   bfd_boolean warn_mismatch;
 146
 147   /* Warn on attempting to open an incompatible library during a library
 148      search.  */
 149   bfd_boolean warn_search_mismatch;
 150
 151   /* If non-zero check section addresses, once computed,
 152      for overlaps.  Relocatable links only check when this is > 0.  */
 153   signed char check_section_addresses;
 154
 155   /* If TRUE allow the linking of input files in an unknown architecture
 156      assuming that the user knows what they are doing.  This was the old
 157      behaviour of the linker.  The new default behaviour is to reject such
 158      input files.  */
 159   bfd_boolean accept_unknown_input_arch;
 160
 161   /* If TRUE we'll just print the default output on stdout.  */
 162   bfd_boolean print_output_format;
 163
 164   /* If set, display the target memory usage (per memory region).  */
 165   bfd_boolean print_memory_usage;
 166
 167   /* Big or little endian as set on command line.  */
 168   enum endian_enum endian;
 169
 170   /* -Bsymbolic and -Bsymbolic-functions, as set on command line.  */
 171   enum symbolic_enum symbolic;
 172
 173   /* --dynamic-list, --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo
 174      and --dynamic-list FILE, as set on command line.  */
 175   enum dynamic_list_enum dynamic_list;
 176
 177   /* Name of runtime interpreter to invoke.  */
 178   char *interpreter;
 179
 180   /* Name to give runtime libary from the -soname argument.  */
 181   char *soname;
 182
 183   /* Runtime library search path from the -rpath argument.  */
 184   char *rpath;
 185
 186   /* Link time runtime library search path from the -rpath-link
 187      argument.  */
 188   char *rpath_link;
 189
 190   /* Name of shared object whose symbol table should be filtered with
 191      this shared object.  From the --filter option.  */
 192   char *filter_shlib;
 193
 194   /* Name of shared object for whose symbol table this shared object
 195      is an auxiliary filter.  From the --auxiliary option.  */
 196   char **auxiliary_filters;
 197
 198   /* A version symbol to be applied to the symbol names found in the
 199      .exports sections.  */
 200   char *version_exports_section;
 201
 202   /* Default linker script.  */
 203   char *default_script;
 204 } args_type;
 205
 206 extern args_type command_line;
 207
 208 typedef int token_code_type;
 209
 210 /* Different ways we can handle orphan sections.  */
 211
 212 enum orphan_handling_enum {
 213   /* The classic strategy, find a suitable section to place the orphan
 214      into.  */
 215   orphan_handling_place = 0,
 216
 217   /* Discard any orphan sections as though they were assign to the section
 218      /DISCARD/.  */
 219   orphan_handling_discard,
 220
 221   /* Find somewhere to place the orphan section, as with
 222      ORPHAN_HANDLING_PLACE, but also issue a warning.  */
 223   orphan_handling_warn,
 224
 225   /* Issue a fatal error if any orphan sections are found.  */
 226   orphan_handling_error,
 227 };
 228
 229 typedef struct {
 230   bfd_boolean magic_demand_paged;
 231   bfd_boolean make_executable;
 232
 233   /* If TRUE, -shared is supported.  */
 234   /* ??? A better way to do this is perhaps to define this in the
 235      ld_emulation_xfer_struct since this is really a target dependent
 236      parameter.  */
 237   bfd_boolean has_shared;
 238
 239   /* If TRUE, build constructors.  */
 240   bfd_boolean build_constructors;
 241
 242   /* If TRUE, warn about any constructors.  */
 243   bfd_boolean warn_constructors;
 244
 245   /* If TRUE, warn about merging common symbols with others.  */
 246   bfd_boolean warn_common;
 247
 248   /* If TRUE, only warn once about a particular undefined symbol.  */
 249   bfd_boolean warn_once;
 250
 251   /* How should we deal with orphan sections.  */
 252   enum orphan_handling_enum orphan_handling;
 253
 254   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 255      only).  */
 256   bfd_boolean warn_multiple_gp;
 257
 258   /* If TRUE, warn if the starting address of an output section
 259      changes due to the alignment of an input section.  */
 260   bfd_boolean warn_section_align;
 261
 262   /* If TRUE, warning messages are fatal */
 263   bfd_boolean fatal_warnings;
 264
 265   sort_order sort_common;
 266
 267   bfd_boolean text_read_only;
 268
 269   bfd_boolean stats;
 270
 271   /* If set, orphan input sections will be mapped to separate output
 272      sections.  */
 273   bfd_boolean unique_orphan_sections;
 274
 275   /* If set, only search library directories explicitly selected
 276      on the command line.  */
 277   bfd_boolean only_cmd_line_lib_dirs;
 278
 279   /* If set, numbers and absolute symbols are simply treated as
 280      numbers everywhere.  */
 281   bfd_boolean sane_expr;
 282
 283   /* If set, code and non-code sections should never be in one segment.  */
 284   bfd_boolean separate_code;
 285
 286   /* The rpath separation character.  Usually ':'.  */
 287   char rpath_separator;
 288
 289   char *map_filename;
 290   FILE *map_file;
 291
 292   unsigned int split_by_reloc;
 293   bfd_size_type split_by_file;
 294
 295   bfd_size_type specified_data_size;
 296
 297   /* The size of the hash table to use.  */
 298   unsigned long hash_table_size;
 299
 300   /* The maximum page size for ELF.  */
 301   bfd_vma maxpagesize;
 302
 303   /* The common page size for ELF.  */
 304   bfd_vma commonpagesize;
 305 } ld_config_type;
 306
 307 extern ld_config_type config;
 308
 309 extern FILE * saved_script_handle;
 310 extern bfd_boolean force_make_executable;
 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