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 GLD, the Gnu Linker.
   7
   8    GLD 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 2, or (at your option)
  11    any later version.
  12
  13    GLD 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 GLD; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  21    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 /* A wildcard specification.  */
 103
 104 typedef enum {
 105   none, by_name, by_alignment, by_name_alignment, by_alignment_name
 106 } sort_type;
 107
 108 extern sort_type sort_section;
 109
 110 struct wildcard_spec {
 111   const char *name;
 112   struct name_list *exclude_name_list;
 113   sort_type sorted;
 114 };
 115
 116 struct wildcard_list {
 117   struct wildcard_list *next;
 118   struct wildcard_spec spec;
 119 };
 120
 121 struct map_symbol_def {
 122   struct bfd_link_hash_entry *entry;
 123   struct map_symbol_def *next;
 124 };
 125
 126 /* The initial part of fat_user_section_struct has to be idential with
 127    lean_user_section_struct.  */
 128 typedef struct fat_user_section_struct {
 129   /* For input sections, when writing a map file: head / tail of a linked
 130      list of hash table entries for symbols defined in this section.  */
 131   struct map_symbol_def *map_symbol_def_head;
 132   struct map_symbol_def **map_symbol_def_tail;
 133 } fat_section_userdata_type;
 134
 135 #define get_userdata(x) ((x)->userdata)
 136
 137 #define BYTE_SIZE       (1)
 138 #define SHORT_SIZE      (2)
 139 #define LONG_SIZE       (4)
 140 #define QUAD_SIZE       (8)
 141
 142 typedef struct {
 143   /* 1 => assign space to common symbols even if `relocatable_output'.  */
 144   bfd_boolean force_common_definition;
 145
 146   /* 1 => do not assign addresses to common symbols.  */
 147   bfd_boolean inhibit_common_definition;
 148   bfd_boolean relax;
 149
 150   /* Name of runtime interpreter to invoke.  */
 151   char *interpreter;
 152
 153   /* Name to give runtime libary from the -soname argument.  */
 154   char *soname;
 155
 156   /* Runtime library search path from the -rpath argument.  */
 157   char *rpath;
 158
 159   /* Link time runtime library search path from the -rpath-link
 160      argument.  */
 161   char *rpath_link;
 162
 163   /* Big or little endian as set on command line.  */
 164   enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE } endian;
 165
 166   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 167      file.  */
 168   bfd_boolean embedded_relocs;
 169
 170   /* If TRUE, force generation of a file with a .exe file.  */
 171   bfd_boolean force_exe_suffix;
 172
 173   /* If TRUE, generate a cross reference report.  */
 174   bfd_boolean cref;
 175
 176   /* If TRUE (which is the default), warn about mismatched input
 177      files.  */
 178   bfd_boolean warn_mismatch;
 179
 180   /* Warn on attempting to open an incompatible library during a library
 181      search.  */
 182   bfd_boolean warn_search_mismatch;
 183
 184   /* Name of shared object whose symbol table should be filtered with
 185      this shared object.  From the --filter option.  */
 186   char *filter_shlib;
 187
 188   /* Name of shared object for whose symbol table this shared object
 189      is an auxiliary filter.  From the --auxiliary option.  */
 190   char **auxiliary_filters;
 191
 192   /* A version symbol to be applied to the symbol names found in the
 193      .exports sections.  */
 194   char *version_exports_section;
 195
 196   /* Default linker script.  */
 197   char *default_script;
 198
 199   /* If TRUE (the default) check section addresses, once compute,
 200      fpor overlaps.  */
 201   bfd_boolean check_section_addresses;
 202
 203   /* If TRUE allow the linking of input files in an unknown architecture
 204      assuming that the user knows what they are doing.  This was the old
 205      behaviour of the linker.  The new default behaviour is to reject such
 206      input files.  */
 207   bfd_boolean accept_unknown_input_arch;
 208
 209   /* -Bsymbolic and -Bsymbolic-functions, as set on command line.  */
 210   enum
 211     {
 212       symbolic_unset = 0,
 213       symbolic,
 214       symbolic_functions,
 215     } symbolic;
 216
 217   /* --dynamic-list, --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo
 218      and --dynamic-list FILE, as set on command line.  */
 219   enum
 220     {
 221       dynamic_list_unset = 0,
 222       dynamic_list_data,
 223       dynamic_list
 224     } dynamic_list;
 225 } args_type;
 226
 227 extern args_type command_line;
 228
 229 typedef int token_code_type;
 230
 231 typedef struct {
 232   bfd_size_type specified_data_size;
 233   bfd_boolean magic_demand_paged;
 234   bfd_boolean make_executable;
 235
 236   /* If TRUE, doing a dynamic link.  */
 237   bfd_boolean dynamic_link;
 238
 239   /* If TRUE, -shared is supported.  */
 240   /* ??? A better way to do this is perhaps to define this in the
 241      ld_emulation_xfer_struct since this is really a target dependent
 242      parameter.  */
 243   bfd_boolean has_shared;
 244
 245   /* If TRUE, build constructors.  */
 246   bfd_boolean build_constructors;
 247
 248   /* If TRUE, warn about any constructors.  */
 249   bfd_boolean warn_constructors;
 250
 251   /* If TRUE, warn about merging common symbols with others.  */
 252   bfd_boolean warn_common;
 253
 254   /* If TRUE, only warn once about a particular undefined symbol.  */
 255   bfd_boolean warn_once;
 256
 257   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 258      only).  */
 259   bfd_boolean warn_multiple_gp;
 260
 261   /* If TRUE, warn if the starting address of an output section
 262      changes due to the alignment of an input section.  */
 263   bfd_boolean warn_section_align;
 264
 265   /* If TRUE, warning messages are fatal */
 266   bfd_boolean fatal_warnings;
 267
 268   bfd_boolean sort_common;
 269
 270   bfd_boolean text_read_only;
 271
 272   char *map_filename;
 273   FILE *map_file;
 274
 275   bfd_boolean stats;
 276
 277   /* If set, orphan input sections will be mapped to separate output
 278      sections.  */
 279   bfd_boolean unique_orphan_sections;
 280
 281   unsigned int split_by_reloc;
 282   bfd_size_type split_by_file;
 283
 284   /* The rpath separation character.  Usually ':'.  */
 285   char rpath_separator;
 286
 287   /* If set, only search library directories explicitly selected
 288      on the command line.  */
 289   bfd_boolean only_cmd_line_lib_dirs;
 290
 291   /* The size of the hash table to use.  */
 292   bfd_size_type 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 /* Non-zero if we are processing a --defsym from the command line.  */
 307 extern int parsing_defsym;
 308
 309 extern int yyparse (void);
 310 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 311 extern bfd_boolean handle_asneeded_cref (bfd *, enum notice_asneeded_action);
 312 extern void output_cref (FILE *);
 313 extern void check_nocrossrefs (void);
 314 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 315
 316 /* If gcc >= 2.6, we can give a function name, too.  */
 317 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 318 #define __PRETTY_FUNCTION__  NULL
 319 #endif
 320
 321 #undef abort
 322 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 323
 324 #endif