ld/ldfile.c

   1 /* Linker file opening and searching.
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2002, 2003
   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 /* ldfile.c:  look after all the file stuff.  */
  23
  24 #include "bfd.h"
  25 #include "sysdep.h"
  26 #include "bfdlink.h"
  27 #include "safe-ctype.h"
  28 #include "ld.h"
  29 #include "ldmisc.h"
  30 #include "ldexp.h"
  31 #include "ldlang.h"
  32 #include "ldfile.h"
  33 #include "ldmain.h"
  34 #include <ldgram.h>
  35 #include "ldlex.h"
  36 #include "ldemul.h"
  37 #include "libiberty.h"
  38 #include "filenames.h"
  39
  40 const char * ldfile_input_filename;
  41 bfd_boolean  ldfile_assumed_script = FALSE;
  42 const char * ldfile_output_machine_name = "";
  43 unsigned long ldfile_output_machine;
  44 enum bfd_architecture ldfile_output_architecture;
  45 search_dirs_type * search_head;
  46
  47 #ifndef MPW
  48 #ifdef VMS
  49 char * slash = "";
  50 #else
  51 #if defined (_WIN32) && ! defined (__CYGWIN32__)
  52 char * slash = "\\";
  53 #else
  54 char * slash = "/";
  55 #endif
  56 #endif
  57 #else /* MPW */
  58 /* The MPW path char is a colon.  */
  59 char * slash = ":";
  60 #endif /* MPW */
  61
  62 typedef struct search_arch
  63 {
  64   char *name;
  65   struct search_arch *next;
  66 } search_arch_type;
  67
  68 static search_dirs_type **search_tail_ptr = &search_head;
  69 static search_arch_type *search_arch_head;
  70 static search_arch_type **search_arch_tail_ptr = &search_arch_head;
  71
  72 static FILE *try_open
  73   PARAMS ((const char *, const char *));
  74 static bfd_boolean is_sysrooted_pathname
  75   PARAMS ((const char *, bfd_boolean));
  76
  77 /* Test whether a pathname, after canonicalization, is the same or a
  78    sub-directory of the sysroot directory.  */
  79
  80 static bfd_boolean
  81 is_sysrooted_pathname (name, notsame)
  82      const char *name;
  83      bfd_boolean notsame;
  84 {
  85   char * realname = ld_canon_sysroot ? lrealpath (name) : NULL;
  86   int len;
  87   bfd_boolean result;
  88
  89   if (! realname)
  90     return FALSE;
  91
  92   len = strlen (realname);
  93
  94   if (((! notsame && len == ld_canon_sysroot_len)
  95        || (len >= ld_canon_sysroot_len
  96            && IS_DIR_SEPARATOR (realname[ld_canon_sysroot_len])
  97            && (realname[ld_canon_sysroot_len] = '\0') == '\0'))
  98       && FILENAME_CMP (ld_canon_sysroot, realname) == 0)
  99     result = TRUE;
 100   else
 101     result = FALSE;
 102
 103   if (realname)
 104     free (realname);
 105
 106   return result;
 107 }
 108
 109 /* Adds NAME to the library search path.
 110    Makes a copy of NAME using xmalloc().  */
 111
 112 void
 113 ldfile_add_library_path (name, cmdline)
 114      const char *name;
 115      bfd_boolean cmdline;
 116 {
 117   search_dirs_type *new;
 118
 119   if (!cmdline && config.only_cmd_line_lib_dirs)
 120     return;
 121
 122   new = (search_dirs_type *) xmalloc (sizeof (search_dirs_type));
 123   new->next = NULL;
 124   new->cmdline = cmdline;
 125   *search_tail_ptr = new;
 126   search_tail_ptr = &new->next;
 127
 128   /* If a directory is marked as honoring sysroot, prepend the sysroot path
 129      now.  */
 130   if (name[0] == '=')
 131     {
 132       new->name = concat (ld_sysroot, name + 1, NULL);
 133       new->sysrooted = TRUE;
 134     }
 135   else
 136     {
 137       new->name = xstrdup (name);
 138       new->sysrooted = is_sysrooted_pathname (name, FALSE);
 139     }
 140 }
 141
 142 /* Try to open a BFD for a lang_input_statement.  */
 143
 144 bfd_boolean
 145 ldfile_try_open_bfd (attempt, entry)
 146      const char *attempt;
 147      lang_input_statement_type *entry;
 148 {
 149   entry->the_bfd = bfd_openr (attempt, entry->target);
 150
 151   if (trace_file_tries)
 152     {
 153       if (entry->the_bfd == NULL)
 154         info_msg (_("attempt to open %s failed\n"), attempt);
 155       else
 156         info_msg (_("attempt to open %s succeeded\n"), attempt);
 157     }
 158
 159   if (entry->the_bfd == NULL)
 160     {
 161       if (bfd_get_error () == bfd_error_invalid_target)
 162         einfo (_("%F%P: invalid BFD target `%s'\n"), entry->target);
 163       return FALSE;
 164     }
 165
 166   /* If we are searching for this file, see if the architecture is
 167      compatible with the output file.  If it isn't, keep searching.
 168      If we can't open the file as an object file, stop the search
 169      here.  */
 170
 171   if (entry->search_dirs_flag)
 172     {
 173       bfd *check;
 174
 175       if (bfd_check_format (entry->the_bfd, bfd_archive))
 176         check = bfd_openr_next_archived_file (entry->the_bfd, NULL);
 177       else
 178         check = entry->the_bfd;
 179
 180       if (check != NULL)
 181         {
 182           if (! bfd_check_format (check, bfd_object))
 183             {
 184               if (check == entry->the_bfd
 185                   && bfd_get_error () == bfd_error_file_not_recognized
 186                   && ! ldemul_unrecognized_file (entry))
 187                 {
 188                   int token, skip = 0;
 189                   char *arg, *arg1, *arg2, *arg3;
 190                   extern FILE *yyin;
 191
 192                   /* Try to interpret the file as a linker script.  */
 193                   ldfile_open_command_file (attempt);
 194
 195                   ldfile_assumed_script = TRUE;
 196                   parser_input = input_selected;
 197                   ldlex_both ();
 198                   token = INPUT_SCRIPT;
 199                   while (token != 0)
 200                     {
 201                       switch (token)
 202                         {
 203                         case OUTPUT_FORMAT:
 204                           if ((token = yylex ()) != '(')
 205                             continue;
 206                           if ((token = yylex ()) != NAME)
 207                             continue;
 208                           arg1 = yylval.name;
 209                           arg2 = NULL;
 210                           arg3 = NULL;
 211                           token = yylex ();
 212                           if (token == ',')
 213                             {
 214                               if ((token = yylex ()) != NAME)
 215                                 {
 216                                   free (arg1);
 217                                   continue;
 218                                 }
 219                               arg2 = yylval.name;
 220                               if ((token = yylex ()) != ','
 221                                   || (token = yylex ()) != NAME)
 222                                 {
 223                                   free (arg1);
 224                                   free (arg2);
 225                                   continue;
 226                                 }
 227                               arg3 = yylval.name;
 228                               token = yylex ();
 229                             }
 230                           if (token == ')')
 231                             {
 232                               switch (command_line.endian)
 233                                 {
 234                                 default:
 235                                 case ENDIAN_UNSET:
 236                                   arg = arg1; break;
 237                                 case ENDIAN_BIG:
 238                                   arg = arg2 ? arg2 : arg1; break;
 239                                 case ENDIAN_LITTLE:
 240                                   arg = arg3 ? arg3 : arg1; break;
 241                                 }
 242                               if (strcmp (arg, lang_get_output_target ()) != 0)
 243                                 skip = 1;
 244                             }
 245                           free (arg1);
 246                           if (arg2) free (arg2);
 247                           if (arg3) free (arg3);
 248                           break;
 249                         case NAME:
 250                         case LNAME:
 251                         case VERS_IDENTIFIER:
 252                         case VERS_TAG:
 253                           free (yylval.name);
 254                           break;
 255                         case INT:
 256                           if (yylval.bigint.str)
 257                             free (yylval.bigint.str);
 258                           break;
 259                         }
 260                       token = yylex ();
 261                     }
 262                   ldlex_popstate ();
 263                   ldfile_assumed_script = FALSE;
 264                   fclose (yyin);
 265                   yyin = NULL;
 266                   if (skip)
 267                     {
 268                       einfo (_("%P: skipping incompatible %s when searching for %s\n"),
 269                              attempt, entry->local_sym_name);
 270                       bfd_close (entry->the_bfd);
 271                       entry->the_bfd = NULL;
 272                       return FALSE;
 273                     }
 274                 }
 275               return TRUE;
 276             }
 277
 278           if ((bfd_arch_get_compatible (check, output_bfd,
 279                                         command_line.accept_unknown_input_arch) == NULL)
 280               /* XCOFF archives can have 32 and 64 bit objects.  */
 281               && ! (bfd_get_flavour (check) == bfd_target_xcoff_flavour
 282                     && bfd_get_flavour (output_bfd) == bfd_target_xcoff_flavour
 283                     && bfd_check_format (entry->the_bfd, bfd_archive)))
 284             {
 285               einfo (_("%P: skipping incompatible %s when searching for %s\n"),
 286                      attempt, entry->local_sym_name);
 287               bfd_close (entry->the_bfd);
 288               entry->the_bfd = NULL;
 289               return FALSE;
 290             }
 291         }
 292     }
 293
 294   return TRUE;
 295 }
 296
 297 /* Search for and open the file specified by ENTRY.  If it is an
 298    archive, use ARCH, LIB and SUFFIX to modify the file name.  */
 299
 300 bfd_boolean
 301 ldfile_open_file_search (arch, entry, lib, suffix)
 302      const char *arch;
 303      lang_input_statement_type *entry;
 304      const char *lib;
 305      const char *suffix;
 306 {
 307   search_dirs_type *search;
 308
 309   /* If this is not an archive, try to open it in the current
 310      directory first.  */
 311   if (! entry->is_archive)
 312     {
 313       if (entry->sysrooted && IS_ABSOLUTE_PATH (entry->filename))
 314         {
 315           char *name = concat (ld_sysroot, entry->filename,
 316                                (const char *) NULL);
 317           if (ldfile_try_open_bfd (name, entry))
 318             {
 319               entry->filename = name;
 320               return TRUE;
 321             }
 322           free (name);
 323         }
 324       else if (ldfile_try_open_bfd (entry->filename, entry))
 325         {
 326           entry->sysrooted = IS_ABSOLUTE_PATH (entry->filename)
 327             && is_sysrooted_pathname (entry->filename, TRUE);
 328           return TRUE;
 329         }
 330
 331       if (IS_ABSOLUTE_PATH (entry->filename))
 332         return FALSE;
 333     }
 334
 335   for (search = search_head;
 336        search != (search_dirs_type *) NULL;
 337        search = search->next)
 338     {
 339       char *string;
 340
 341       if (entry->dynamic && ! link_info.relocatable)
 342         {
 343           if (ldemul_open_dynamic_archive (arch, search, entry))
 344             {
 345               entry->sysrooted = search->sysrooted;
 346               return TRUE;
 347             }
 348         }
 349
 350       string = (char *) xmalloc (strlen (search->name)
 351                                  + strlen (slash)
 352                                  + strlen (lib)
 353                                  + strlen (entry->filename)
 354                                  + strlen (arch)
 355                                  + strlen (suffix)
 356                                  + 1);
 357
 358       if (entry->is_archive)
 359         sprintf (string, "%s%s%s%s%s%s", search->name, slash,
 360                  lib, entry->filename, arch, suffix);
 361       else
 362         sprintf (string, "%s%s%s", search->name, slash, entry->filename);
 363
 364       if (ldfile_try_open_bfd (string, entry))
 365         {
 366           entry->filename = string;
 367           entry->sysrooted = search->sysrooted;
 368           return TRUE;
 369         }
 370
 371       free (string);
 372     }
 373
 374   return FALSE;
 375 }
 376
 377 /* Open the input file specified by ENTRY.  */
 378
 379 void
 380 ldfile_open_file (entry)
 381      lang_input_statement_type *entry;
 382 {
 383   if (entry->the_bfd != NULL)
 384     return;
 385
 386   if (! entry->search_dirs_flag)
 387     {
 388       if (ldfile_try_open_bfd (entry->filename, entry))
 389         return;
 390       if (strcmp (entry->filename, entry->local_sym_name) != 0)
 391         einfo (_("%F%P: cannot open %s for %s: %E\n"),
 392                entry->filename, entry->local_sym_name);
 393       else
 394         einfo (_("%F%P: cannot open %s: %E\n"), entry->local_sym_name);
 395     }
 396   else
 397     {
 398       search_arch_type *arch;
 399       bfd_boolean found = FALSE;
 400
 401       /* Try to open <filename><suffix> or lib<filename><suffix>.a */
 402       for (arch = search_arch_head;
 403            arch != (search_arch_type *) NULL;
 404            arch = arch->next)
 405         {
 406           found = ldfile_open_file_search (arch->name, entry, "lib", ".a");
 407           if (found)
 408             break;
 409 #ifdef VMS
 410           found = ldfile_open_file_search (arch->name, entry, ":lib", ".a");
 411           if (found)
 412             break;
 413 #endif
 414           found = ldemul_find_potential_libraries (arch->name, entry);
 415           if (found)
 416             break;
 417         }
 418
 419       /* If we have found the file, we don't need to search directories
 420          again.  */
 421       if (found)
 422         entry->search_dirs_flag = FALSE;
 423       else if (entry->sysrooted
 424                && ld_sysroot
 425                && IS_ABSOLUTE_PATH (entry->local_sym_name))
 426         einfo (_("%F%P: cannot find %s inside %s\n"),
 427                entry->local_sym_name, ld_sysroot);
 428       else
 429         einfo (_("%F%P: cannot find %s\n"), entry->local_sym_name);
 430     }
 431 }
 432
 433 /* Try to open NAME; if that fails, try NAME with EXTEN appended to it.  */
 434
 435 static FILE *
 436 try_open (name, exten)
 437      const char *name;
 438      const char *exten;
 439 {
 440   FILE *result;
 441   char buff[1000];
 442
 443   result = fopen (name, "r");
 444
 445   if (trace_file_tries)
 446     {
 447       if (result == NULL)
 448         info_msg (_("cannot find script file %s\n"), name);
 449       else
 450         info_msg (_("opened script file %s\n"), name);
 451     }
 452
 453   if (result != NULL)
 454     return result;
 455
 456   if (*exten)
 457     {
 458       sprintf (buff, "%s%s", name, exten);
 459       result = fopen (buff, "r");
 460
 461       if (trace_file_tries)
 462         {
 463           if (result == NULL)
 464             info_msg (_("cannot find script file %s\n"), buff);
 465           else
 466             info_msg (_("opened script file %s\n"), buff);
 467         }
 468     }
 469
 470   return result;
 471 }
 472
 473 /* Try to open NAME; if that fails, look for it in any directories
 474    specified with -L, without and with EXTEND appended.  */
 475
 476 FILE *
 477 ldfile_find_command_file (name, extend)
 478      const char *name;
 479      const char *extend;
 480 {
 481   search_dirs_type *search;
 482   FILE *result;
 483   char buffer[1000];
 484
 485   /* First try raw name.  */
 486   result = try_open (name, "");
 487   if (result == (FILE *) NULL)
 488     {
 489       /* Try now prefixes.  */
 490       for (search = search_head;
 491            search != (search_dirs_type *) NULL;
 492            search = search->next)
 493         {
 494           sprintf (buffer, "%s%s%s", search->name, slash, name);
 495
 496           result = try_open (buffer, extend);
 497           if (result)
 498             break;
 499         }
 500     }
 501
 502   return result;
 503 }
 504
 505 void
 506 ldfile_open_command_file (name)
 507      const char *name;
 508 {
 509   FILE *ldlex_input_stack;
 510   ldlex_input_stack = ldfile_find_command_file (name, "");
 511
 512   if (ldlex_input_stack == (FILE *) NULL)
 513     {
 514       bfd_set_error (bfd_error_system_call);
 515       einfo (_("%P%F: cannot open linker script file %s: %E\n"), name);
 516     }
 517
 518   lex_push_file (ldlex_input_stack, name);
 519
 520   ldfile_input_filename = name;
 521   lineno = 1;
 522
 523   saved_script_handle = ldlex_input_stack;
 524 }
 525
 526 #ifdef GNU960
 527 static char *
 528 gnu960_map_archname (name)
 529      char *name;
 530 {
 531   struct tabentry { char *cmd_switch; char *arch; };
 532   static struct tabentry arch_tab[] =
 533   {
 534         "",   "",
 535         "KA", "ka",
 536         "KB", "kb",
 537         "KC", "mc",     /* Synonym for MC */
 538         "MC", "mc",
 539         "CA", "ca",
 540         "SA", "ka",     /* Functionally equivalent to KA */
 541         "SB", "kb",     /* Functionally equivalent to KB */
 542         NULL, ""
 543   };
 544   struct tabentry *tp;
 545
 546   for (tp = arch_tab; tp->cmd_switch != NULL; tp++)
 547     {
 548       if (! strcmp (name,tp->cmd_switch))
 549         break;
 550     }
 551
 552   if (tp->cmd_switch == NULL)
 553     einfo (_("%P%F: unknown architecture: %s\n"), name);
 554
 555   return tp->arch;
 556 }
 557
 558 void
 559 ldfile_add_arch (name)
 560      char *name;
 561 {
 562   search_arch_type *new =
 563     (search_arch_type *) xmalloc ((bfd_size_type) (sizeof (search_arch_type)));
 564
 565   if (*name != '\0')
 566     {
 567       if (ldfile_output_machine_name[0] != '\0')
 568         {
 569           einfo (_("%P%F: target architecture respecified\n"));
 570           return;
 571         }
 572
 573       ldfile_output_machine_name = name;
 574     }
 575
 576   new->next = (search_arch_type *) NULL;
 577   new->name = gnu960_map_archname (name);
 578   *search_arch_tail_ptr = new;
 579   search_arch_tail_ptr = &new->next;
 580 }
 581
 582 #else /* not GNU960 */
 583
 584 void
 585 ldfile_add_arch (in_name)
 586      const char *in_name;
 587 {
 588   char *name = xstrdup (in_name);
 589   search_arch_type *new =
 590     (search_arch_type *) xmalloc (sizeof (search_arch_type));
 591
 592   ldfile_output_machine_name = in_name;
 593
 594   new->name = name;
 595   new->next = (search_arch_type *) NULL;
 596   while (*name)
 597     {
 598       *name = TOLOWER (*name);
 599       name++;
 600     }
 601   *search_arch_tail_ptr = new;
 602   search_arch_tail_ptr = &new->next;
 603
 604 }
 605 #endif
 606
 607 /* Set the output architecture.  */
 608
 609 void
 610 ldfile_set_output_arch (string)
 611      const char *string;
 612 {
 613   const bfd_arch_info_type *arch = bfd_scan_arch (string);
 614
 615   if (arch)
 616     {
 617       ldfile_output_architecture = arch->arch;
 618       ldfile_output_machine = arch->mach;
 619       ldfile_output_machine_name = arch->printable_name;
 620     }
 621   else
 622     {
 623       einfo (_("%P%F: cannot represent machine `%s'\n"), string);
 624     }
 625 }