bfd/plugin.c

   1 /* Plugin support for BFD.
   2    Copyright (C) 2009-2021 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   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 #include "sysdep.h"
  22 #include "bfd.h"
  23
  24 #if BFD_SUPPORTS_PLUGINS
  25
  26 #include <assert.h>
  27 #ifdef HAVE_DLFCN_H
  28 #include <dlfcn.h>
  29 #elif defined (HAVE_WINDOWS_H)
  30 #include <windows.h>
  31 #else
  32 #error Unknown how to handle dynamic-load-libraries.
  33 #endif
  34 #include <stdarg.h>
  35 #include "plugin-api.h"
  36 #include "plugin.h"
  37 #include "libbfd.h"
  38 #include "libiberty.h"
  39 #include <dirent.h>
  40
  41 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
  42
  43 #define RTLD_NOW 0      /* Dummy value.  */
  44
  45 static void *
  46 dlopen (const char *file, int mode ATTRIBUTE_UNUSED)
  47 {
  48   return LoadLibrary (file);
  49 }
  50
  51 static void *
  52 dlsym (void *handle, const char *name)
  53 {
  54   return GetProcAddress (handle, name);
  55 }
  56
  57 static int ATTRIBUTE_UNUSED
  58 dlclose (void *handle)
  59 {
  60   FreeLibrary (handle);
  61   return 0;
  62 }
  63
  64 static const char *
  65 dlerror (void)
  66 {
  67   return "Unable to load DLL.";
  68 }
  69
  70 #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)  */
  71
  72 #define bfd_plugin_close_and_cleanup                  _bfd_generic_close_and_cleanup
  73 #define bfd_plugin_bfd_free_cached_info               _bfd_generic_bfd_free_cached_info
  74 #define bfd_plugin_new_section_hook                   _bfd_generic_new_section_hook
  75 #define bfd_plugin_get_section_contents               _bfd_generic_get_section_contents
  76 #define bfd_plugin_get_section_contents_in_window     _bfd_generic_get_section_contents_in_window
  77 #define bfd_plugin_bfd_copy_private_header_data       _bfd_generic_bfd_copy_private_header_data
  78 #define bfd_plugin_bfd_merge_private_bfd_data         _bfd_generic_bfd_merge_private_bfd_data
  79 #define bfd_plugin_bfd_copy_private_header_data       _bfd_generic_bfd_copy_private_header_data
  80 #define bfd_plugin_bfd_set_private_flags              _bfd_generic_bfd_set_private_flags
  81 #define bfd_plugin_core_file_matches_executable_p     generic_core_file_matches_executable_p
  82 #define bfd_plugin_bfd_is_local_label_name            _bfd_nosymbols_bfd_is_local_label_name
  83 #define bfd_plugin_bfd_is_target_special_symbol       _bfd_bool_bfd_asymbol_false
  84 #define bfd_plugin_get_lineno                         _bfd_nosymbols_get_lineno
  85 #define bfd_plugin_find_nearest_line                  _bfd_nosymbols_find_nearest_line
  86 #define bfd_plugin_find_line                          _bfd_nosymbols_find_line
  87 #define bfd_plugin_find_inliner_info                  _bfd_nosymbols_find_inliner_info
  88 #define bfd_plugin_get_symbol_version_string          _bfd_nosymbols_get_symbol_version_string
  89 #define bfd_plugin_bfd_make_debug_symbol              _bfd_nosymbols_bfd_make_debug_symbol
  90 #define bfd_plugin_read_minisymbols                   _bfd_generic_read_minisymbols
  91 #define bfd_plugin_minisymbol_to_symbol               _bfd_generic_minisymbol_to_symbol
  92 #define bfd_plugin_set_arch_mach                      bfd_default_set_arch_mach
  93 #define bfd_plugin_set_section_contents               _bfd_generic_set_section_contents
  94 #define bfd_plugin_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
  95 #define bfd_plugin_bfd_relax_section                  bfd_generic_relax_section
  96 #define bfd_plugin_bfd_link_hash_table_create         _bfd_generic_link_hash_table_create
  97 #define bfd_plugin_bfd_link_add_symbols               _bfd_generic_link_add_symbols
  98 #define bfd_plugin_bfd_link_just_syms                 _bfd_generic_link_just_syms
  99 #define bfd_plugin_bfd_final_link                     _bfd_generic_final_link
 100 #define bfd_plugin_bfd_link_split_section             _bfd_generic_link_split_section
 101 #define bfd_plugin_bfd_gc_sections                    bfd_generic_gc_sections
 102 #define bfd_plugin_bfd_lookup_section_flags           bfd_generic_lookup_section_flags
 103 #define bfd_plugin_bfd_merge_sections                 bfd_generic_merge_sections
 104 #define bfd_plugin_bfd_is_group_section               bfd_generic_is_group_section
 105 #define bfd_plugin_bfd_group_name                     bfd_generic_group_name
 106 #define bfd_plugin_bfd_discard_group                  bfd_generic_discard_group
 107 #define bfd_plugin_section_already_linked             _bfd_generic_section_already_linked
 108 #define bfd_plugin_bfd_define_common_symbol           bfd_generic_define_common_symbol
 109 #define bfd_plugin_bfd_link_hide_symbol               _bfd_generic_link_hide_symbol
 110 #define bfd_plugin_bfd_define_start_stop              bfd_generic_define_start_stop
 111 #define bfd_plugin_bfd_copy_link_hash_symbol_type     _bfd_generic_copy_link_hash_symbol_type
 112 #define bfd_plugin_bfd_link_check_relocs              _bfd_generic_link_check_relocs
 113
 114 static enum ld_plugin_status
 115 message (int level ATTRIBUTE_UNUSED,
 116          const char * format, ...)
 117 {
 118   va_list args;
 119   va_start (args, format);
 120   printf ("bfd plugin: ");
 121   vprintf (format, args);
 122   putchar ('\n');
 123   va_end (args);
 124   return LDPS_OK;
 125 }
 126
 127 struct plugin_list_entry
 128 {
 129   /* These must be initialized for each IR object with LTO wrapper.  */
 130   ld_plugin_claim_file_handler claim_file;
 131   ld_plugin_all_symbols_read_handler all_symbols_read;
 132   ld_plugin_all_symbols_read_handler cleanup_handler;
 133   bfd_boolean has_symbol_type;
 134
 135   struct plugin_list_entry *next;
 136
 137   /* These can be reused for all IR objects.  */
 138   const char *plugin_name;
 139 };
 140
 141 static const char *plugin_program_name;
 142
 143 void
 144 bfd_plugin_set_program_name (const char *program_name)
 145 {
 146   plugin_program_name = program_name;
 147 }
 148
 149 static struct plugin_list_entry *plugin_list = NULL;
 150 static struct plugin_list_entry *current_plugin = NULL;
 151
 152 /* Register a claim-file handler. */
 153
 154 static enum ld_plugin_status
 155 register_claim_file (ld_plugin_claim_file_handler handler)
 156 {
 157   current_plugin->claim_file = handler;
 158   return LDPS_OK;
 159 }
 160
 161 static enum ld_plugin_status
 162 add_symbols (void * handle,
 163              int nsyms,
 164              const struct ld_plugin_symbol * syms)
 165 {
 166   bfd *abfd = handle;
 167   struct plugin_data_struct *plugin_data =
 168     bfd_alloc (abfd, sizeof (plugin_data_struct));
 169
 170   if (!plugin_data)
 171     return LDPS_ERR;
 172
 173   plugin_data->nsyms = nsyms;
 174   plugin_data->syms = syms;
 175
 176   if (nsyms != 0)
 177     abfd->flags |= HAS_SYMS;
 178
 179   abfd->tdata.plugin_data = plugin_data;
 180   return LDPS_OK;
 181 }
 182
 183 static enum ld_plugin_status
 184 add_symbols_v2 (void *handle, int nsyms,
 185                 const struct ld_plugin_symbol *syms)
 186 {
 187   current_plugin->has_symbol_type = TRUE;
 188   return add_symbols (handle, nsyms, syms);
 189 }
 190
 191 int
 192 bfd_plugin_open_input (bfd *ibfd, struct ld_plugin_input_file *file)
 193 {
 194   bfd *iobfd;
 195
 196   iobfd = ibfd;
 197   while (iobfd->my_archive
 198          && !bfd_is_thin_archive (iobfd->my_archive))
 199     iobfd = iobfd->my_archive;
 200   file->name = bfd_get_filename (iobfd);
 201
 202   if (!iobfd->iostream && !bfd_open_file (iobfd))
 203     return 0;
 204
 205   /* The plugin API expects that the file descriptor won't be closed
 206      and reused as done by the bfd file cache.  So open it again.
 207      dup isn't good enough.  plugin IO uses lseek/read while BFD uses
 208      fseek/fread.  It isn't wise to mix the unistd and stdio calls on
 209      the same underlying file descriptor.  */
 210   file->fd = open (file->name, O_RDONLY | O_BINARY);
 211   if (file->fd < 0)
 212     return 0;
 213
 214   if (iobfd == ibfd)
 215     {
 216       struct stat stat_buf;
 217
 218       if (fstat (file->fd, &stat_buf))
 219         {
 220           close(file->fd);
 221           return 0;
 222         }
 223
 224       file->offset = 0;
 225       file->filesize = stat_buf.st_size;
 226     }
 227   else
 228     {
 229       file->offset = ibfd->origin;
 230       file->filesize = arelt_size (ibfd);
 231     }
 232   return 1;
 233 }
 234
 235 static int
 236 try_claim (bfd *abfd)
 237 {
 238   int claimed = 0;
 239   struct ld_plugin_input_file file;
 240
 241   file.handle = abfd;
 242   if (bfd_plugin_open_input (abfd, &file)
 243       && current_plugin->claim_file)
 244     {
 245       current_plugin->claim_file (&file, &claimed);
 246       close (file.fd);
 247     }
 248
 249   return claimed;
 250 }
 251
 252 static bfd_boolean
 253 try_load_plugin (const char *                pname,
 254                  struct plugin_list_entry *  plugin_list_iter,
 255                  bfd *                       abfd,
 256                  bfd_boolean                 build_list_p)
 257 {
 258   void *plugin_handle;
 259   struct ld_plugin_tv tv[5];
 260   int i;
 261   ld_plugin_onload onload;
 262   enum ld_plugin_status status;
 263   bfd_boolean result = FALSE;
 264
 265   /* NB: Each object is independent.  Reuse the previous plugin from
 266      the last run will lead to wrong result.  */
 267   if (current_plugin)
 268     memset (current_plugin, 0,
 269             offsetof (struct plugin_list_entry, next));
 270
 271   if (plugin_list_iter)
 272     pname = plugin_list_iter->plugin_name;
 273
 274   plugin_handle = dlopen (pname, RTLD_NOW);
 275   if (!plugin_handle)
 276     {
 277       /* If we are building a list of viable plugins, then
 278          we do not bother the user with the details of any
 279          plugins that cannot be loaded.  */
 280       if (! build_list_p)
 281         _bfd_error_handler ("Failed to load plugin '%s', reason: %s\n",
 282                             pname, dlerror ());
 283       return FALSE;
 284     }
 285
 286   if (plugin_list_iter == NULL)
 287     {
 288       size_t length_plugin_name = strlen (pname) + 1;
 289       char *plugin_name = bfd_malloc (length_plugin_name);
 290
 291       if (plugin_name == NULL)
 292         goto short_circuit;
 293       plugin_list_iter = bfd_malloc (sizeof *plugin_list_iter);
 294       if (plugin_list_iter == NULL)
 295         {
 296           free (plugin_name);
 297           goto short_circuit;
 298         }
 299       /* Make a copy of PNAME since PNAME from load_plugin () will be
 300          freed.  */
 301       memcpy (plugin_name, pname, length_plugin_name);
 302       memset (plugin_list_iter, 0, sizeof (*plugin_list_iter));
 303       plugin_list_iter->plugin_name = plugin_name;
 304       plugin_list_iter->next = plugin_list;
 305       plugin_list = plugin_list_iter;
 306     }
 307
 308   current_plugin = plugin_list_iter;
 309   if (build_list_p)
 310     goto short_circuit;
 311
 312   onload = dlsym (plugin_handle, "onload");
 313   if (!onload)
 314     goto short_circuit;
 315
 316   i = 0;
 317   tv[i].tv_tag = LDPT_MESSAGE;
 318   tv[i].tv_u.tv_message = message;
 319
 320   ++i;
 321   tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
 322   tv[i].tv_u.tv_register_claim_file = register_claim_file;
 323
 324   ++i;
 325   tv[i].tv_tag = LDPT_ADD_SYMBOLS;
 326   tv[i].tv_u.tv_add_symbols = add_symbols;
 327
 328   ++i;
 329   tv[i].tv_tag = LDPT_ADD_SYMBOLS_V2;
 330   tv[i].tv_u.tv_add_symbols = add_symbols_v2;
 331
 332   ++i;
 333   tv[i].tv_tag = LDPT_NULL;
 334   tv[i].tv_u.tv_val = 0;
 335
 336   /* LTO plugin will call handler hooks to set up plugin handlers.  */
 337   status = (*onload)(tv);
 338
 339   if (status != LDPS_OK)
 340     goto short_circuit;
 341
 342   abfd->plugin_format = bfd_plugin_no;
 343
 344   if (!current_plugin->claim_file)
 345     goto short_circuit;
 346
 347   if (!try_claim (abfd))
 348     goto short_circuit;
 349
 350   abfd->plugin_format = bfd_plugin_yes;
 351   result = TRUE;
 352
 353  short_circuit:
 354   dlclose (plugin_handle);
 355   return result;
 356 }
 357
 358 /* There may be plugin libraries in lib/bfd-plugins.  */
 359 static int has_plugin_list = -1;
 360
 361 static bfd_cleanup (*ld_plugin_object_p) (bfd *);
 362
 363 static const char *plugin_name;
 364
 365 void
 366 bfd_plugin_set_plugin (const char *p)
 367 {
 368   plugin_name = p;
 369 }
 370
 371 /* Return TRUE if a plugin library is used.  */
 372
 373 bfd_boolean
 374 bfd_plugin_specified_p (void)
 375 {
 376   return plugin_list != NULL;
 377 }
 378
 379 /* Return TRUE if ABFD can be claimed by linker LTO plugin.  */
 380
 381 bfd_boolean
 382 bfd_link_plugin_object_p (bfd *abfd)
 383 {
 384   if (ld_plugin_object_p)
 385     return ld_plugin_object_p (abfd) != NULL;
 386   return FALSE;
 387 }
 388
 389 extern const bfd_target plugin_vec;
 390
 391 /* Return TRUE if TARGET is a pointer to plugin_vec.  */
 392
 393 bfd_boolean
 394 bfd_plugin_target_p (const bfd_target *target)
 395 {
 396   return target == &plugin_vec;
 397 }
 398
 399 /* Register OBJECT_P to be used by bfd_plugin_object_p.  */
 400
 401 void
 402 register_ld_plugin_object_p (bfd_cleanup (*object_p) (bfd *))
 403 {
 404   ld_plugin_object_p = object_p;
 405 }
 406
 407 static void
 408 build_plugin_list (bfd *abfd)
 409 {
 410   /* The intent was to search ${libdir}/bfd-plugins for plugins, but
 411      unfortunately the original implementation wasn't precisely that
 412      when configuring binutils using --libdir.  Search in the proper
 413      path first, then the old one for backwards compatibility.  */
 414   static const char *path[]
 415     = { LIBDIR "/bfd-plugins", BINDIR "/../lib/bfd-plugins" };
 416   struct stat last_st;
 417   unsigned int i;
 418
 419   if (has_plugin_list >= 0)
 420     return;
 421
 422   /* Try not to search the same dir twice, by looking at st_dev and
 423      st_ino for the dir.  If we are on a file system that always sets
 424      st_ino to zero or the actual st_ino is zero we might waste some
 425      time, but that doesn't matter too much.  */
 426   last_st.st_dev = 0;
 427   last_st.st_ino = 0;
 428   for (i = 0; i < sizeof (path) / sizeof (path[0]); i++)
 429     {
 430       char *plugin_dir = make_relative_prefix (plugin_program_name,
 431                                                BINDIR,
 432                                                path[i]);
 433       if (plugin_dir)
 434         {
 435           struct stat st;
 436           DIR *d;
 437
 438           if (stat (plugin_dir, &st) == 0
 439               && S_ISDIR (st.st_mode)
 440               && !(last_st.st_dev == st.st_dev
 441                    && last_st.st_ino == st.st_ino
 442                    && st.st_ino != 0)
 443               && (d = opendir (plugin_dir)) != NULL)
 444             {
 445               struct dirent *ent;
 446
 447               last_st.st_dev = st.st_dev;
 448               last_st.st_ino = st.st_ino;
 449               while ((ent = readdir (d)) != NULL)
 450                 {
 451                   char *full_name;
 452
 453                   full_name = concat (plugin_dir, "/", ent->d_name, NULL);
 454                   if (stat (full_name, &st) == 0 && S_ISREG (st.st_mode))
 455                     (void) try_load_plugin (full_name, NULL, abfd, TRUE);
 456                   free (full_name);
 457                 }
 458               closedir (d);
 459             }
 460           free (plugin_dir);
 461         }
 462     }
 463
 464   has_plugin_list = plugin_list != NULL;
 465 }
 466
 467 static bfd_boolean
 468 load_plugin (bfd *abfd)
 469 {
 470   struct plugin_list_entry *plugin_list_iter;
 471
 472   if (plugin_name)
 473     return try_load_plugin (plugin_name, plugin_list, abfd, FALSE);
 474
 475   if (plugin_program_name == NULL)
 476     return FALSE;
 477
 478   build_plugin_list (abfd);
 479
 480   for (plugin_list_iter = plugin_list;
 481        plugin_list_iter;
 482        plugin_list_iter = plugin_list_iter->next)
 483     if (try_load_plugin (NULL, plugin_list_iter, abfd,FALSE))
 484       return TRUE;
 485
 486   return FALSE;
 487 }
 488
 489
 490 static bfd_cleanup
 491 bfd_plugin_object_p (bfd *abfd)
 492 {
 493   if (ld_plugin_object_p)
 494     return ld_plugin_object_p (abfd);
 495
 496   if (abfd->plugin_format == bfd_plugin_unknown && !load_plugin (abfd))
 497     return NULL;
 498
 499   return abfd->plugin_format == bfd_plugin_yes ? _bfd_no_cleanup : NULL;
 500 }
 501
 502 /* Copy any private info we understand from the input bfd
 503    to the output bfd.  */
 504
 505 static bfd_boolean
 506 bfd_plugin_bfd_copy_private_bfd_data (bfd *ibfd ATTRIBUTE_UNUSED,
 507                                       bfd *obfd ATTRIBUTE_UNUSED)
 508 {
 509   BFD_ASSERT (0);
 510   return TRUE;
 511 }
 512
 513 /* Copy any private info we understand from the input section
 514    to the output section.  */
 515
 516 static bfd_boolean
 517 bfd_plugin_bfd_copy_private_section_data (bfd *ibfd ATTRIBUTE_UNUSED,
 518                                           asection *isection ATTRIBUTE_UNUSED,
 519                                           bfd *obfd ATTRIBUTE_UNUSED,
 520                                           asection *osection ATTRIBUTE_UNUSED)
 521 {
 522   BFD_ASSERT (0);
 523   return TRUE;
 524 }
 525
 526 /* Copy any private info we understand from the input symbol
 527    to the output symbol.  */
 528
 529 static bfd_boolean
 530 bfd_plugin_bfd_copy_private_symbol_data (bfd *ibfd ATTRIBUTE_UNUSED,
 531                                          asymbol *isymbol ATTRIBUTE_UNUSED,
 532                                          bfd *obfd ATTRIBUTE_UNUSED,
 533                                          asymbol *osymbol ATTRIBUTE_UNUSED)
 534 {
 535   BFD_ASSERT (0);
 536   return TRUE;
 537 }
 538
 539 static bfd_boolean
 540 bfd_plugin_bfd_print_private_bfd_data (bfd *abfd ATTRIBUTE_UNUSED, PTR ptr ATTRIBUTE_UNUSED)
 541 {
 542   BFD_ASSERT (0);
 543   return TRUE;
 544 }
 545
 546 static char *
 547 bfd_plugin_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
 548 {
 549   BFD_ASSERT (0);
 550   return NULL;
 551 }
 552
 553 static int
 554 bfd_plugin_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
 555 {
 556   BFD_ASSERT (0);
 557   return 0;
 558 }
 559
 560 static int
 561 bfd_plugin_core_file_pid (bfd *abfd ATTRIBUTE_UNUSED)
 562 {
 563   BFD_ASSERT (0);
 564   return 0;
 565 }
 566
 567 static long
 568 bfd_plugin_get_symtab_upper_bound (bfd *abfd)
 569 {
 570   struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
 571   long nsyms = plugin_data->nsyms;
 572
 573   BFD_ASSERT (nsyms >= 0);
 574
 575   return ((nsyms + 1) * sizeof (asymbol *));
 576 }
 577
 578 static flagword
 579 convert_flags (const struct ld_plugin_symbol *sym)
 580 {
 581  switch (sym->def)
 582    {
 583    case LDPK_DEF:
 584    case LDPK_COMMON:
 585    case LDPK_UNDEF:
 586      return BSF_GLOBAL;
 587
 588    case LDPK_WEAKUNDEF:
 589    case LDPK_WEAKDEF:
 590      return BSF_GLOBAL | BSF_WEAK;
 591
 592    default:
 593      BFD_ASSERT (0);
 594      return 0;
 595    }
 596 }
 597
 598 static long
 599 bfd_plugin_canonicalize_symtab (bfd *abfd,
 600                                 asymbol **alocation)
 601 {
 602   struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
 603   long nsyms = plugin_data->nsyms;
 604   const struct ld_plugin_symbol *syms = plugin_data->syms;
 605   static asection fake_text_section
 606     = BFD_FAKE_SECTION (fake_text_section, NULL, "plug", 0,
 607                         SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS);
 608   static asection fake_data_section
 609     = BFD_FAKE_SECTION (fake_data_section, NULL, "plug", 0,
 610                         SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS);
 611   static asection fake_bss_section
 612     = BFD_FAKE_SECTION (fake_bss_section, NULL, "plug", 0,
 613                         SEC_ALLOC);
 614   static asection fake_common_section
 615     = BFD_FAKE_SECTION (fake_common_section, NULL, "plug", 0, SEC_IS_COMMON);
 616   int i;
 617
 618   for (i = 0; i < nsyms; i++)
 619     {
 620       asymbol *s = bfd_alloc (abfd, sizeof (asymbol));
 621
 622       BFD_ASSERT (s);
 623       alocation[i] = s;
 624
 625       s->the_bfd = abfd;
 626       s->name = syms[i].name;
 627       s->value = 0;
 628       s->flags = convert_flags (&syms[i]);
 629       switch (syms[i].def)
 630         {
 631         case LDPK_COMMON:
 632           s->section = &fake_common_section;
 633           break;
 634         case LDPK_UNDEF:
 635         case LDPK_WEAKUNDEF:
 636           s->section = bfd_und_section_ptr;
 637           break;
 638         case LDPK_DEF:
 639         case LDPK_WEAKDEF:
 640           if (current_plugin->has_symbol_type)
 641             switch (syms[i].symbol_type)
 642               {
 643               default:
 644                 /* FIXME: Should we issue an error here ?  */
 645               case LDST_UNKNOWN:
 646                 /* What is the best fake section for LDST_UNKNOWN?  */
 647               case LDST_FUNCTION:
 648                 s->section = &fake_text_section;
 649                 break;
 650               case LDST_VARIABLE:
 651                 if (syms[i].section_kind == LDSSK_BSS)
 652                   s->section = &fake_bss_section;
 653                 else
 654                   s->section = &fake_data_section;
 655                 break;
 656               }
 657           else
 658             s->section = &fake_text_section;
 659           break;
 660         default:
 661           BFD_ASSERT (0);
 662         }
 663
 664       s->udata.p = (void *) &syms[i];
 665     }
 666
 667   return nsyms;
 668 }
 669
 670 static void
 671 bfd_plugin_print_symbol (bfd *abfd ATTRIBUTE_UNUSED,
 672                          PTR afile ATTRIBUTE_UNUSED,
 673                          asymbol *symbol ATTRIBUTE_UNUSED,
 674                          bfd_print_symbol_type how ATTRIBUTE_UNUSED)
 675 {
 676   BFD_ASSERT (0);
 677 }
 678
 679 static void
 680 bfd_plugin_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED,
 681                             asymbol *symbol,
 682                             symbol_info *ret)
 683 {
 684   bfd_symbol_info (symbol, ret);
 685 }
 686
 687 /* Make an empty symbol. */
 688
 689 static asymbol *
 690 bfd_plugin_make_empty_symbol (bfd *abfd)
 691 {
 692   asymbol *new_symbol = bfd_zalloc (abfd, sizeof (asymbol));
 693   if (new_symbol == NULL)
 694     return new_symbol;
 695   new_symbol->the_bfd = abfd;
 696   return new_symbol;
 697 }
 698
 699 static int
 700 bfd_plugin_sizeof_headers (bfd *a ATTRIBUTE_UNUSED,
 701                            struct bfd_link_info *info ATTRIBUTE_UNUSED)
 702 {
 703   BFD_ASSERT (0);
 704   return 0;
 705 }
 706
 707 const bfd_target plugin_vec =
 708 {
 709   "plugin",                     /* Name.  */
 710   bfd_target_unknown_flavour,
 711   BFD_ENDIAN_LITTLE,            /* Target byte order.  */
 712   BFD_ENDIAN_LITTLE,            /* Target headers byte order.  */
 713   (HAS_RELOC | EXEC_P |         /* Object flags.  */
 714    HAS_LINENO | HAS_DEBUG |
 715    HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
 716   (SEC_CODE | SEC_DATA | SEC_ROM | SEC_HAS_CONTENTS
 717    | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* Section flags.  */
 718   0,                            /* symbol_leading_char.  */
 719   '/',                          /* ar_pad_char.  */
 720   15,                           /* ar_max_namelen.  */
 721   255,                          /* match priority.  */
 722
 723   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 724   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 725   bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* data */
 726   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 727   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 728   bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* hdrs */
 729
 730   {                             /* bfd_check_format.  */
 731     _bfd_dummy_target,
 732     bfd_plugin_object_p,
 733     bfd_generic_archive_p,
 734     _bfd_dummy_target
 735   },
 736   {                             /* bfd_set_format.  */
 737     _bfd_bool_bfd_false_error,
 738     _bfd_bool_bfd_false_error,
 739     _bfd_generic_mkarchive,
 740     _bfd_bool_bfd_false_error,
 741   },
 742   {                             /* bfd_write_contents.  */
 743     _bfd_bool_bfd_false_error,
 744     _bfd_bool_bfd_false_error,
 745     _bfd_write_archive_contents,
 746     _bfd_bool_bfd_false_error,
 747   },
 748
 749   BFD_JUMP_TABLE_GENERIC (bfd_plugin),
 750   BFD_JUMP_TABLE_COPY (bfd_plugin),
 751   BFD_JUMP_TABLE_CORE (bfd_plugin),
 752 #ifdef USE_64_BIT_ARCHIVE
 753   BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_64_bit),
 754 #else
 755   BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
 756 #endif
 757   BFD_JUMP_TABLE_SYMBOLS (bfd_plugin),
 758   BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 759   BFD_JUMP_TABLE_WRITE (bfd_plugin),
 760   BFD_JUMP_TABLE_LINK (bfd_plugin),
 761   BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 762
 763   NULL,
 764
 765   NULL                          /* backend_data.  */
 766 };
 767 #endif /* BFD_SUPPORTS_PLUGINS */