ld/ld.h

   1 /* ld.h -- general linker header file
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2004
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GLD, the Gnu Linker.
   6
   7    GLD is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    GLD is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GLD; see the file COPYING.  If not, write to the Free
  19    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA.  */
  21
  22 #ifndef LD_H
  23 #define LD_H
  24
  25 #ifdef HAVE_LOCALE_H
  26 # include <locale.h>
  27 #endif
  28
  29 #ifdef ENABLE_NLS
  30 # include <libintl.h>
  31 # define _(String) gettext (String)
  32 # ifdef gettext_noop
  33 #  define N_(String) gettext_noop (String)
  34 # else
  35 #  define N_(String) (String)
  36 # endif
  37 #else
  38 # define gettext(Msgid) (Msgid)
  39 # define dgettext(Domainname, Msgid) (Msgid)
  40 # define dcgettext(Domainname, Msgid, Category) (Msgid)
  41 # define textdomain(Domainname) while (0) /* nothing */
  42 # define bindtextdomain(Domainname, Dirname) while (0) /* nothing */
  43 # define _(String) (String)
  44 # define N_(String) (String)
  45 #endif
  46
  47 #include "bin-bugs.h"
  48
  49 /* Look in this environment name for the linker to pretend to be */
  50 #define EMULATION_ENVIRON "LDEMULATION"
  51 /* If in there look for the strings: */
  52
  53 /* Look in this variable for a target format */
  54 #define TARGET_ENVIRON "GNUTARGET"
  55
  56 /* Input sections which are put in a section of this name are actually
  57    discarded.  */
  58 #define DISCARD_SECTION_NAME "/DISCARD/"
  59
  60 /* A file name list */
  61 typedef struct name_list {
  62   const char *name;
  63   struct name_list *next;
  64 }
  65 name_list;
  66
  67 /* A wildcard specification.  */
  68
  69 typedef enum {
  70   none, by_name, by_alignment, by_name_alignment, by_alignment_name
  71 } sort_type;
  72
  73 extern sort_type sort_section;
  74
  75 struct wildcard_spec {
  76   const char *name;
  77   struct name_list *exclude_name_list;
  78   sort_type sorted;
  79 };
  80
  81 struct wildcard_list {
  82   struct wildcard_list *next;
  83   struct wildcard_spec spec;
  84 };
  85
  86 struct map_symbol_def {
  87   struct bfd_link_hash_entry *entry;
  88   struct map_symbol_def *next;
  89 };
  90
  91 /* Extra information we hold on sections */
  92 typedef struct lean_user_section_struct {
  93   /* For output sections: pointer to the section where this data will go.  */
  94   struct lang_input_statement_struct *file;
  95 } lean_section_userdata_type;
  96
  97 /* The initial part of fat_user_section_struct has to be idential with
  98    lean_user_section_struct.  */
  99 typedef struct fat_user_section_struct {
 100   /* For output sections: pointer to the section where this data will go.  */
 101   struct lang_input_statement_struct *file;
 102   /* For input sections, when writing a map file: head / tail of a linked
 103      list of hash table entries for symbols defined in this section.  */
 104   struct map_symbol_def *map_symbol_def_head;
 105   struct map_symbol_def **map_symbol_def_tail;
 106 } fat_section_userdata_type;
 107
 108 #define SECTION_USERDATA_SIZE \
 109  (command_line.reduce_memory_overheads \
 110   ? sizeof (lean_section_userdata_type) \
 111   : sizeof (fat_section_userdata_type))
 112
 113 #define get_userdata(x) ((x)->userdata)
 114
 115 #define BYTE_SIZE       (1)
 116 #define SHORT_SIZE      (2)
 117 #define LONG_SIZE       (4)
 118 #define QUAD_SIZE       (8)
 119
 120 typedef struct {
 121   /* 1 => assign space to common symbols even if `relocatable_output'.  */
 122   bfd_boolean force_common_definition;
 123
 124   /* 1 => do not assign addresses to common symbols.  */
 125   bfd_boolean inhibit_common_definition;
 126   bfd_boolean relax;
 127
 128   /* Name of runtime interpreter to invoke.  */
 129   char *interpreter;
 130
 131   /* Name to give runtime libary from the -soname argument.  */
 132   char *soname;
 133
 134   /* Runtime library search path from the -rpath argument.  */
 135   char *rpath;
 136
 137   /* Link time runtime library search path from the -rpath-link
 138      argument.  */
 139   char *rpath_link;
 140
 141   /* Big or little endian as set on command line.  */
 142   enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE } endian;
 143
 144   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 145      file.  */
 146   bfd_boolean embedded_relocs;
 147
 148   /* If TRUE, force generation of a file with a .exe file.  */
 149   bfd_boolean force_exe_suffix;
 150
 151   /* If TRUE, generate a cross reference report.  */
 152   bfd_boolean cref;
 153
 154   /* If TRUE (which is the default), warn about mismatched input
 155      files.  */
 156   bfd_boolean warn_mismatch;
 157
 158   /* Remove unreferenced sections?  */
 159   bfd_boolean gc_sections;
 160
 161   /* Name of shared object whose symbol table should be filtered with
 162      this shared object.  From the --filter option.  */
 163   char *filter_shlib;
 164
 165   /* Name of shared object for whose symbol table this shared object
 166      is an auxiliary filter.  From the --auxiliary option.  */
 167   char **auxiliary_filters;
 168
 169   /* A version symbol to be applied to the symbol names found in the
 170      .exports sections.  */
 171   char *version_exports_section;
 172
 173   /* If TRUE (the default) check section addresses, once compute,
 174      fpor overlaps.  */
 175   bfd_boolean check_section_addresses;
 176
 177   /* If TRUE allow the linking of input files in an unknown architecture
 178      assuming that the user knows what they are doing.  This was the old
 179      behaviour of the linker.  The new default behaviour is to reject such
 180      input files.  */
 181   bfd_boolean accept_unknown_input_arch;
 182
 183   /* If TRUE reduce memory overheads, at the expense of speed.
 184      This will cause map file generation to use an O(N^2) algorithm.  */
 185   bfd_boolean reduce_memory_overheads;
 186
 187 } args_type;
 188
 189 extern args_type command_line;
 190
 191 typedef int token_code_type;
 192
 193 typedef struct {
 194   bfd_size_type specified_data_size;
 195   bfd_boolean magic_demand_paged;
 196   bfd_boolean make_executable;
 197
 198   /* If TRUE, doing a dynamic link.  */
 199   bfd_boolean dynamic_link;
 200
 201   /* If TRUE, -shared is supported.  */
 202   /* ??? A better way to do this is perhaps to define this in the
 203      ld_emulation_xfer_struct since this is really a target dependent
 204      parameter.  */
 205   bfd_boolean has_shared;
 206
 207   /* If TRUE, build constructors.  */
 208   bfd_boolean build_constructors;
 209
 210   /* If TRUE, warn about any constructors.  */
 211   bfd_boolean warn_constructors;
 212
 213   /* If TRUE, warn about merging common symbols with others.  */
 214   bfd_boolean warn_common;
 215
 216   /* If TRUE, only warn once about a particular undefined symbol.  */
 217   bfd_boolean warn_once;
 218
 219   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 220      only).  */
 221   bfd_boolean warn_multiple_gp;
 222
 223   /* If TRUE, warn if the starting address of an output section
 224      changes due to the alignment of an input section.  */
 225   bfd_boolean warn_section_align;
 226
 227   /* If TRUE, warning messages are fatal */
 228   bfd_boolean fatal_warnings;
 229
 230   bfd_boolean sort_common;
 231
 232   bfd_boolean text_read_only;
 233
 234   char *map_filename;
 235   FILE *map_file;
 236
 237   bfd_boolean stats;
 238
 239   /* If set, orphan input sections will be mapped to separate output
 240      sections.  */
 241   bfd_boolean unique_orphan_sections;
 242
 243   unsigned int split_by_reloc;
 244   bfd_size_type split_by_file;
 245
 246   /* If set, only search library directories explicitly selected
 247      on the command line.  */
 248   bfd_boolean only_cmd_line_lib_dirs;
 249
 250   /* The size of the hash table to use.  */
 251   bfd_size_type hash_table_size;
 252 } ld_config_type;
 253
 254 extern ld_config_type config;
 255
 256 typedef enum {
 257   lang_first_phase_enum,
 258   lang_allocating_phase_enum,
 259   lang_final_phase_enum
 260 } lang_phase_type;
 261
 262 extern FILE * saved_script_handle;
 263 extern bfd_boolean force_make_executable;
 264
 265 /* Non-zero if we are processing a --defsym from the command line.  */
 266 extern int parsing_defsym;
 267
 268 extern int yyparse (void);
 269 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 270 extern void output_cref (FILE *);
 271 extern void check_nocrossrefs (void);
 272 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 273
 274 /* If gcc >= 2.6, we can give a function name, too.  */
 275 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 276 #define __PRETTY_FUNCTION__  NULL
 277 #endif
 278
 279 #undef abort
 280 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 281
 282 #endif