ld/ldemul.c

   1 /* ldemul.c -- clearing house for ld emulation states
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
   3    2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010, 2011
   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 #include "sysdep.h"
  24 #include "bfd.h"
  25 #include "getopt.h"
  26 #include "bfdlink.h"
  27
  28 #include "ld.h"
  29 #include "ldmisc.h"
  30 #include "ldexp.h"
  31 #include "ldlang.h"
  32 #include "ldfile.h"
  33 #include "ldemul.h"
  34 #include "ldmain.h"
  35 #include "ldemul-list.h"
  36
  37 static ld_emulation_xfer_type *ld_emulation;
  38
  39 void
  40 ldemul_hll (char *name)
  41 {
  42   ld_emulation->hll (name);
  43 }
  44
  45 void
  46 ldemul_syslib (char *name)
  47 {
  48   ld_emulation->syslib (name);
  49 }
  50
  51 void
  52 ldemul_after_parse (void)
  53 {
  54   ld_emulation->after_parse ();
  55 }
  56
  57 void
  58 ldemul_before_parse (void)
  59 {
  60   ld_emulation->before_parse ();
  61 }
  62
  63 void
  64 ldemul_after_open (void)
  65 {
  66   ld_emulation->after_open ();
  67 }
  68
  69 void
  70 ldemul_after_allocation (void)
  71 {
  72   ld_emulation->after_allocation ();
  73 }
  74
  75 void
  76 ldemul_before_allocation (void)
  77 {
  78   ld_emulation->before_allocation ();
  79 }
  80
  81 void
  82 ldemul_set_output_arch (void)
  83 {
  84   ld_emulation->set_output_arch ();
  85 }
  86
  87 void
  88 ldemul_finish (void)
  89 {
  90   ld_emulation->finish ();
  91 }
  92
  93 void
  94 ldemul_set_symbols (void)
  95 {
  96   if (ld_emulation->set_symbols)
  97     ld_emulation->set_symbols ();
  98 }
  99
 100 void
 101 ldemul_create_output_section_statements (void)
 102 {
 103   if (ld_emulation->create_output_section_statements)
 104     ld_emulation->create_output_section_statements ();
 105 }
 106
 107 char *
 108 ldemul_get_script (int *isfile)
 109 {
 110   return ld_emulation->get_script (isfile);
 111 }
 112
 113 bfd_boolean
 114 ldemul_open_dynamic_archive (const char *arch, search_dirs_type *search,
 115                              lang_input_statement_type *entry)
 116 {
 117   if (ld_emulation->open_dynamic_archive)
 118     return (*ld_emulation->open_dynamic_archive) (arch, search, entry);
 119   return FALSE;
 120 }
 121
 122 lang_output_section_statement_type *
 123 ldemul_place_orphan (asection *s, const char *name, int constraint)
 124 {
 125   if (ld_emulation->place_orphan)
 126     return (*ld_emulation->place_orphan) (s, name, constraint);
 127   return NULL;
 128 }
 129
 130 void
 131 ldemul_add_options (int ns, char **shortopts, int nl,
 132                     struct option **longopts, int nrl,
 133                     struct option **really_longopts)
 134 {
 135   if (ld_emulation->add_options)
 136     (*ld_emulation->add_options) (ns, shortopts, nl, longopts,
 137                                   nrl, really_longopts);
 138 }
 139
 140 bfd_boolean
 141 ldemul_handle_option (int optc)
 142 {
 143   if (ld_emulation->handle_option)
 144     return (*ld_emulation->handle_option) (optc);
 145   return FALSE;
 146 }
 147
 148 bfd_boolean
 149 ldemul_parse_args (int argc, char **argv)
 150 {
 151   /* Try and use the emulation parser if there is one.  */
 152   if (ld_emulation->parse_args)
 153     return (*ld_emulation->parse_args) (argc, argv);
 154   return FALSE;
 155 }
 156
 157 /* Let the emulation code handle an unrecognized file.  */
 158
 159 bfd_boolean
 160 ldemul_unrecognized_file (lang_input_statement_type *entry)
 161 {
 162   if (ld_emulation->unrecognized_file)
 163     return (*ld_emulation->unrecognized_file) (entry);
 164   return FALSE;
 165 }
 166
 167 /* Let the emulation code handle a recognized file.  */
 168
 169 bfd_boolean
 170 ldemul_recognized_file (lang_input_statement_type *entry)
 171 {
 172   if (ld_emulation->recognized_file)
 173     return (*ld_emulation->recognized_file) (entry);
 174   return FALSE;
 175 }
 176
 177 char *
 178 ldemul_choose_target (int argc, char **argv)
 179 {
 180   return ld_emulation->choose_target (argc, argv);
 181 }
 182
 183
 184 /* The default choose_target function.  */
 185
 186 char *
 187 ldemul_default_target (int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 188 {
 189   char *from_outside = getenv (TARGET_ENVIRON);
 190   if (from_outside != (char *) NULL)
 191     return from_outside;
 192   return ld_emulation->target_name;
 193 }
 194
 195 /* If the entry point was not specified as an address, then add the
 196    symbol as undefined.  This will cause ld to extract an archive
 197    element defining the entry if ld is linking against such an archive.
 198
 199    We don't do this when generating shared libraries unless given -e
 200    on the command line, because most shared libs are not designed to
 201    be run as an executable.  However, some are, eg. glibc ld.so and
 202    may rely on the default linker script supplying ENTRY.  So we can't
 203    remove the ENTRY from the script, but would rather not insert
 204    undefined _start syms.  */
 205
 206 void
 207 after_parse_default (void)
 208 {
 209   if (entry_symbol.name != NULL
 210       && (link_info.executable || entry_from_cmdline))
 211     {
 212       bfd_boolean is_vma = FALSE;
 213
 214       if (entry_from_cmdline)
 215         {
 216           const char *send;
 217
 218           bfd_scan_vma (entry_symbol.name, &send, 0);
 219           is_vma = *send == '\0';
 220         }
 221       if (!is_vma)
 222         ldlang_add_undef (entry_symbol.name, entry_from_cmdline);
 223     }
 224 }
 225
 226 void
 227 after_open_default (void)
 228 {
 229 }
 230
 231 void
 232 after_allocation_default (void)
 233 {
 234   lang_relax_sections (FALSE);
 235 }
 236
 237 void
 238 before_allocation_default (void)
 239 {
 240   if (!link_info.relocatable)
 241     strip_excluded_output_sections ();
 242 }
 243
 244 void
 245 finish_default (void)
 246 {
 247   if (!link_info.relocatable)
 248     _bfd_fix_excluded_sec_syms (link_info.output_bfd, &link_info);
 249 }
 250
 251 void
 252 set_output_arch_default (void)
 253 {
 254   /* Set the output architecture and machine if possible.  */
 255   bfd_set_arch_mach (link_info.output_bfd,
 256                      ldfile_output_architecture, ldfile_output_machine);
 257
 258   bfd_emul_set_maxpagesize (output_target, config.maxpagesize);
 259   bfd_emul_set_commonpagesize (output_target, config.commonpagesize);
 260 }
 261
 262 void
 263 syslib_default (char *ignore ATTRIBUTE_UNUSED)
 264 {
 265   info_msg (_("%S SYSLIB ignored\n"));
 266 }
 267
 268 void
 269 hll_default (char *ignore ATTRIBUTE_UNUSED)
 270 {
 271   info_msg (_("%S HLL ignored\n"));
 272 }
 273
 274 ld_emulation_xfer_type *ld_emulations[] = { EMULATION_LIST };
 275
 276 void
 277 ldemul_choose_mode (char *target)
 278 {
 279   ld_emulation_xfer_type **eptr = ld_emulations;
 280   /* Ignore "gld" prefix.  */
 281   if (target[0] == 'g' && target[1] == 'l' && target[2] == 'd')
 282     target += 3;
 283   for (; *eptr; eptr++)
 284     {
 285       if (strcmp (target, (*eptr)->emulation_name) == 0)
 286         {
 287           ld_emulation = *eptr;
 288           return;
 289         }
 290     }
 291   einfo (_("%P: unrecognised emulation mode: %s\n"), target);
 292   einfo (_("Supported emulations: "));
 293   ldemul_list_emulations (stderr);
 294   einfo ("%F\n");
 295 }
 296
 297 void
 298 ldemul_list_emulations (FILE *f)
 299 {
 300   ld_emulation_xfer_type **eptr = ld_emulations;
 301   bfd_boolean first = TRUE;
 302
 303   for (; *eptr; eptr++)
 304     {
 305       if (first)
 306         first = FALSE;
 307       else
 308         fprintf (f, " ");
 309       fprintf (f, "%s", (*eptr)->emulation_name);
 310     }
 311 }
 312
 313 void
 314 ldemul_list_emulation_options (FILE *f)
 315 {
 316   ld_emulation_xfer_type **eptr;
 317   int options_found = 0;
 318
 319   for (eptr = ld_emulations; *eptr; eptr++)
 320     {
 321       ld_emulation_xfer_type *emul = *eptr;
 322
 323       if (emul->list_options)
 324         {
 325           fprintf (f, "%s: \n", emul->emulation_name);
 326
 327           emul->list_options (f);
 328
 329           options_found = 1;
 330         }
 331     }
 332
 333   if (! options_found)
 334     fprintf (f, _("  no emulation specific options.\n"));
 335 }
 336
 337 int
 338 ldemul_find_potential_libraries (char *name, lang_input_statement_type *entry)
 339 {
 340   if (ld_emulation->find_potential_libraries)
 341     return ld_emulation->find_potential_libraries (name, entry);
 342
 343   return 0;
 344 }
 345
 346 struct bfd_elf_version_expr *
 347 ldemul_new_vers_pattern (struct bfd_elf_version_expr *entry)
 348 {
 349   if (ld_emulation->new_vers_pattern)
 350     entry = (*ld_emulation->new_vers_pattern) (entry);
 351   return entry;
 352 }