bfd/plugin.c

   1 /* Plugin support for BFD.
   2    Copyright (C) 2009-2020 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 int
 253 try_load_plugin (const char *pname,
 254                  struct plugin_list_entry *plugin_list_iter,
 255                  bfd *abfd, bfd_boolean build_list_p)
 256 {
 257   void *plugin_handle;
 258   struct ld_plugin_tv tv[5];
 259   int i;
 260   ld_plugin_onload onload;
 261   enum ld_plugin_status status;
 262   int result = 0;
 263
 264   /* NB: Each object is independent.  Reuse the previous plugin from
 265      the last run will lead to wrong result.  */
 266   if (current_plugin)
 267     memset (current_plugin, 0,
 268             offsetof (struct plugin_list_entry, next));
 269
 270   if (plugin_list_iter)
 271     pname = plugin_list_iter->plugin_name;
 272
 273   plugin_handle = dlopen (pname, RTLD_NOW);
 274   if (!plugin_handle)
 275     {
 276       _bfd_error_handler ("Failed to load plugin '%s', reason: %s\n",
 277                           pname, dlerror ());
 278       return 0;
 279     }
 280
 281   if (plugin_list_iter == NULL)
 282     {
 283       size_t length_plugin_name = strlen (pname) + 1;
 284       char *plugin_name = bfd_malloc (length_plugin_name);
 285       if (plugin_name == NULL)
 286         goto short_circuit;
 287       plugin_list_iter = bfd_malloc (sizeof *plugin_list_iter);
 288       if (plugin_list_iter == NULL)
 289         {
 290           free (plugin_name);
 291           goto short_circuit;
 292         }
 293       /* Make a copy of PNAME since PNAME from load_plugin () will be
 294          freed.  */
 295       memcpy (plugin_name, pname, length_plugin_name);
 296       memset (plugin_list_iter, 0, sizeof (*plugin_list_iter));
 297       plugin_list_iter->plugin_name = plugin_name;
 298       plugin_list_iter->next = plugin_list;
 299       plugin_list = plugin_list_iter;
 300     }
 301
 302   current_plugin = plugin_list_iter;
 303   if (build_list_p)
 304     goto short_circuit;
 305
 306   onload = dlsym (plugin_handle, "onload");
 307   if (!onload)
 308     goto short_circuit;
 309
 310   i = 0;
 311   tv[i].tv_tag = LDPT_MESSAGE;
 312   tv[i].tv_u.tv_message = message;
 313
 314   ++i;
 315   tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
 316   tv[i].tv_u.tv_register_claim_file = register_claim_file;
 317
 318   ++i;
 319   tv[i].tv_tag = LDPT_ADD_SYMBOLS;
 320   tv[i].tv_u.tv_add_symbols = add_symbols;
 321
 322   ++i;
 323   tv[i].tv_tag = LDPT_ADD_SYMBOLS_V2;
 324   tv[i].tv_u.tv_add_symbols = add_symbols_v2;
 325
 326   ++i;
 327   tv[i].tv_tag = LDPT_NULL;
 328   tv[i].tv_u.tv_val = 0;
 329
 330   /* LTO plugin will call handler hooks to set up plugin handlers.  */
 331   status = (*onload)(tv);
 332
 333   if (status != LDPS_OK)
 334     goto short_circuit;
 335
 336   abfd->plugin_format = bfd_plugin_no;
 337
 338   if (!current_plugin->claim_file)
 339     goto short_circuit;
 340
 341   if (!try_claim (abfd))
 342     goto short_circuit;
 343
 344   abfd->plugin_format = bfd_plugin_yes;
 345   result = 1;
 346
 347  short_circuit:
 348   dlclose (plugin_handle);
 349   return result;
 350 }
 351
 352 /* There may be plugin libraries in lib/bfd-plugins.  */
 353 static int has_plugin_list = -1;
 354
 355 static bfd_cleanup (*ld_plugin_object_p) (bfd *);
 356
 357 static const char *plugin_name;
 358
 359 void
 360 bfd_plugin_set_plugin (const char *p)
 361 {
 362   plugin_name = p;
 363 }
 364
 365 /* Return TRUE if a plugin library is used.  */
 366
 367 bfd_boolean
 368 bfd_plugin_specified_p (void)
 369 {
 370   return plugin_list != NULL;
 371 }
 372
 373 /* Return TRUE if ABFD can be claimed by linker LTO plugin.  */
 374
 375 bfd_boolean
 376 bfd_link_plugin_object_p (bfd *abfd)
 377 {
 378   if (ld_plugin_object_p)
 379     return ld_plugin_object_p (abfd) != NULL;
 380   return FALSE;
 381 }
 382
 383 extern const bfd_target plugin_vec;
 384
 385 /* Return TRUE if TARGET is a pointer to plugin_vec.  */
 386
 387 bfd_boolean
 388 bfd_plugin_target_p (const bfd_target *target)
 389 {
 390   return target == &plugin_vec;
 391 }
 392
 393 /* Register OBJECT_P to be used by bfd_plugin_object_p.  */
 394
 395 void
 396 register_ld_plugin_object_p (bfd_cleanup (*object_p) (bfd *))
 397 {
 398   ld_plugin_object_p = object_p;
 399 }
 400
 401 static void
 402 build_plugin_list (bfd *abfd)
 403 {
 404   /* The intent was to search ${libdir}/bfd-plugins for plugins, but
 405      unfortunately the original implementation wasn't precisely that
 406      when configuring binutils using --libdir.  Search in the proper
 407      path first, then the old one for backwards compatibility.  */
 408   static const char *path[]
 409     = { LIBDIR "/bfd-plugins", BINDIR "/../lib/bfd-plugins" };
 410   struct stat last_st;
 411   unsigned int i;
 412
 413   if (has_plugin_list >= 0)
 414     return;
 415
 416   /* Try not to search the same dir twice, by looking at st_dev and
 417      st_ino for the dir.  If we are on a file system that always sets
 418      st_ino to zero or the actual st_ino is zero we might waste some
 419      time, but that doesn't matter too much.  */
 420   last_st.st_dev = 0;
 421   last_st.st_ino = 0;
 422   for (i = 0; i < sizeof (path) / sizeof (path[0]); i++)
 423     {
 424       char *plugin_dir = make_relative_prefix (plugin_program_name,
 425                                                BINDIR,
 426                                                path[i]);
 427       if (plugin_dir)
 428         {
 429           struct stat st;
 430           DIR *d;
 431
 432           if (stat (plugin_dir, &st) == 0
 433               && S_ISDIR (st.st_mode)
 434               && !(last_st.st_dev == st.st_dev
 435                    && last_st.st_ino == st.st_ino
 436                    && st.st_ino != 0)
 437               && (d = opendir (plugin_dir)) != NULL)
 438             {
 439               struct dirent *ent;
 440
 441               last_st.st_dev = st.st_dev;
 442               last_st.st_ino = st.st_ino;
 443               while ((ent = readdir (d)) != NULL)
 444                 {
 445                   char *full_name;
 446
 447                   full_name = concat (plugin_dir, "/", ent->d_name, NULL);
 448                   if (stat (full_name, &st) == 0 && S_ISREG (st.st_mode))
 449                     try_load_plugin (full_name, NULL, abfd, TRUE);
 450                   free (full_name);
 451                 }
 452               closedir (d);
 453             }
 454           free (plugin_dir);
 455         }
 456     }
 457
 458   has_plugin_list = plugin_list != NULL;
 459 }
 460
 461 static int
 462 load_plugin (bfd *abfd)
 463 {
 464   struct plugin_list_entry *plugin_list_iter;
 465
 466   if (plugin_name)
 467     return try_load_plugin (plugin_name, plugin_list, abfd, FALSE);
 468
 469   if (plugin_program_name == NULL)
 470     return 0;
 471
 472   build_plugin_list (abfd);
 473
 474   for (plugin_list_iter = plugin_list;
 475        plugin_list_iter;
 476        plugin_list_iter = plugin_list_iter->next)
 477     if (try_load_plugin (NULL, plugin_list_iter, abfd, FALSE))
 478       return 1;
 479
 480   return 0;
 481 }
 482
 483
 484 static bfd_cleanup
 485 bfd_plugin_object_p (bfd *abfd)
 486 {
 487   if (ld_plugin_object_p)
 488     return ld_plugin_object_p (abfd);
 489
 490   if (abfd->plugin_format == bfd_plugin_unknown && !load_plugin (abfd))
 491     return NULL;
 492
 493   return abfd->plugin_format == bfd_plugin_yes ? _bfd_no_cleanup : NULL;
 494 }
 495
 496 /* Copy any private info we understand from the input bfd
 497    to the output bfd.  */
 498
 499 static bfd_boolean
 500 bfd_plugin_bfd_copy_private_bfd_data (bfd *ibfd ATTRIBUTE_UNUSED,
 501                                       bfd *obfd ATTRIBUTE_UNUSED)
 502 {
 503   BFD_ASSERT (0);
 504   return TRUE;
 505 }
 506
 507 /* Copy any private info we understand from the input section
 508    to the output section.  */
 509
 510 static bfd_boolean
 511 bfd_plugin_bfd_copy_private_section_data (bfd *ibfd ATTRIBUTE_UNUSED,
 512                                           asection *isection ATTRIBUTE_UNUSED,
 513                                           bfd *obfd ATTRIBUTE_UNUSED,
 514                                           asection *osection ATTRIBUTE_UNUSED)
 515 {
 516   BFD_ASSERT (0);
 517   return TRUE;
 518 }
 519
 520 /* Copy any private info we understand from the input symbol
 521    to the output symbol.  */
 522
 523 static bfd_boolean
 524 bfd_plugin_bfd_copy_private_symbol_data (bfd *ibfd ATTRIBUTE_UNUSED,
 525                                          asymbol *isymbol ATTRIBUTE_UNUSED,
 526                                          bfd *obfd ATTRIBUTE_UNUSED,
 527                                          asymbol *osymbol ATTRIBUTE_UNUSED)
 528 {
 529   BFD_ASSERT (0);
 530   return TRUE;
 531 }
 532
 533 static bfd_boolean
 534 bfd_plugin_bfd_print_private_bfd_data (bfd *abfd ATTRIBUTE_UNUSED, PTR ptr ATTRIBUTE_UNUSED)
 535 {
 536   BFD_ASSERT (0);
 537   return TRUE;
 538 }
 539
 540 static char *
 541 bfd_plugin_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
 542 {
 543   BFD_ASSERT (0);
 544   return NULL;
 545 }
 546
 547 static int
 548 bfd_plugin_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
 549 {
 550   BFD_ASSERT (0);
 551   return 0;
 552 }
 553
 554 static int
 555 bfd_plugin_core_file_pid (bfd *abfd ATTRIBUTE_UNUSED)
 556 {
 557   BFD_ASSERT (0);
 558   return 0;
 559 }
 560
 561 static long
 562 bfd_plugin_get_symtab_upper_bound (bfd *abfd)
 563 {
 564   struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
 565   long nsyms = plugin_data->nsyms;
 566
 567   BFD_ASSERT (nsyms >= 0);
 568
 569   return ((nsyms + 1) * sizeof (asymbol *));
 570 }
 571
 572 static flagword
 573 convert_flags (const struct ld_plugin_symbol *sym)
 574 {
 575  switch (sym->def)
 576    {
 577    case LDPK_DEF:
 578    case LDPK_COMMON:
 579    case LDPK_UNDEF:
 580      return BSF_GLOBAL;
 581
 582    case LDPK_WEAKUNDEF:
 583    case LDPK_WEAKDEF:
 584      return BSF_GLOBAL | BSF_WEAK;
 585
 586    default:
 587      BFD_ASSERT (0);
 588      return 0;
 589    }
 590 }
 591
 592 static long
 593 bfd_plugin_canonicalize_symtab (bfd *abfd,
 594                                 asymbol **alocation)
 595 {
 596   struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
 597   long nsyms = plugin_data->nsyms;
 598   const struct ld_plugin_symbol *syms = plugin_data->syms;
 599   static asection fake_text_section
 600     = BFD_FAKE_SECTION (fake_text_section, NULL, "plug", 0,
 601                         SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS);
 602   static asection fake_data_section
 603     = BFD_FAKE_SECTION (fake_data_section, NULL, "plug", 0,
 604                         SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS);
 605   static asection fake_bss_section
 606     = BFD_FAKE_SECTION (fake_bss_section, NULL, "plug", 0,
 607                         SEC_ALLOC);
 608   static asection fake_common_section
 609     = BFD_FAKE_SECTION (fake_common_section, NULL, "plug", 0, SEC_IS_COMMON);
 610   int i;
 611
 612   for (i = 0; i < nsyms; i++)
 613     {
 614       asymbol *s = bfd_alloc (abfd, sizeof (asymbol));
 615
 616       BFD_ASSERT (s);
 617       alocation[i] = s;
 618
 619       s->the_bfd = abfd;
 620       s->name = syms[i].name;
 621       s->value = 0;
 622       s->flags = convert_flags (&syms[i]);
 623       switch (syms[i].def)
 624         {
 625         case LDPK_COMMON:
 626           s->section = &fake_common_section;
 627           break;
 628         case LDPK_UNDEF:
 629         case LDPK_WEAKUNDEF:
 630           s->section = bfd_und_section_ptr;
 631           break;
 632         case LDPK_DEF:
 633         case LDPK_WEAKDEF:
 634           if (current_plugin->has_symbol_type)
 635             switch (syms[i].symbol_type)
 636               {
 637               case LDST_UNKNOWN:
 638                 /* What is the best fake section for LDST_UNKNOWN?  */
 639               case LDST_FUNCTION:
 640                 s->section = &fake_text_section;
 641                 break;
 642               case LDST_VARIABLE:
 643                 if (syms[i].section_kind == LDSSK_BSS)
 644                   s->section = &fake_bss_section;
 645                 else
 646                   s->section = &fake_data_section;
 647                 break;
 648               }
 649           else
 650             s->section = &fake_text_section;
 651           break;
 652         default:
 653           BFD_ASSERT (0);
 654         }
 655
 656       s->udata.p = (void *) &syms[i];
 657     }
 658
 659   return nsyms;
 660 }
 661
 662 static void
 663 bfd_plugin_print_symbol (bfd *abfd ATTRIBUTE_UNUSED,
 664                          PTR afile ATTRIBUTE_UNUSED,
 665                          asymbol *symbol ATTRIBUTE_UNUSED,
 666                          bfd_print_symbol_type how ATTRIBUTE_UNUSED)
 667 {
 668   BFD_ASSERT (0);
 669 }
 670
 671 static void
 672 bfd_plugin_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED,
 673                             asymbol *symbol,
 674                             symbol_info *ret)
 675 {
 676   bfd_symbol_info (symbol, ret);
 677 }
 678
 679 /* Make an empty symbol. */
 680
 681 static asymbol *
 682 bfd_plugin_make_empty_symbol (bfd *abfd)
 683 {
 684   asymbol *new_symbol = bfd_zalloc (abfd, sizeof (asymbol));
 685   if (new_symbol == NULL)
 686     return new_symbol;
 687   new_symbol->the_bfd = abfd;
 688   return new_symbol;
 689 }
 690
 691 static int
 692 bfd_plugin_sizeof_headers (bfd *a ATTRIBUTE_UNUSED,
 693                            struct bfd_link_info *info ATTRIBUTE_UNUSED)
 694 {
 695   BFD_ASSERT (0);
 696   return 0;
 697 }
 698
 699 const bfd_target plugin_vec =
 700 {
 701   "plugin",                     /* Name.  */
 702   bfd_target_unknown_flavour,
 703   BFD_ENDIAN_LITTLE,            /* Target byte order.  */
 704   BFD_ENDIAN_LITTLE,            /* Target headers byte order.  */
 705   (HAS_RELOC | EXEC_P |         /* Object flags.  */
 706    HAS_LINENO | HAS_DEBUG |
 707    HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
 708   (SEC_CODE | SEC_DATA | SEC_ROM | SEC_HAS_CONTENTS
 709    | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* Section flags.  */
 710   0,                            /* symbol_leading_char.  */
 711   '/',                          /* ar_pad_char.  */
 712   15,                           /* ar_max_namelen.  */
 713   255,                          /* match priority.  */
 714
 715   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 716   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 717   bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* data */
 718   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 719   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 720   bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* hdrs */
 721
 722   {                             /* bfd_check_format.  */
 723     _bfd_dummy_target,
 724     bfd_plugin_object_p,
 725     bfd_generic_archive_p,
 726     _bfd_dummy_target
 727   },
 728   {                             /* bfd_set_format.  */
 729     _bfd_bool_bfd_false_error,
 730     _bfd_bool_bfd_false_error,
 731     _bfd_generic_mkarchive,
 732     _bfd_bool_bfd_false_error,
 733   },
 734   {                             /* bfd_write_contents.  */
 735     _bfd_bool_bfd_false_error,
 736     _bfd_bool_bfd_false_error,
 737     _bfd_write_archive_contents,
 738     _bfd_bool_bfd_false_error,
 739   },
 740
 741   BFD_JUMP_TABLE_GENERIC (bfd_plugin),
 742   BFD_JUMP_TABLE_COPY (bfd_plugin),
 743   BFD_JUMP_TABLE_CORE (bfd_plugin),
 744 #ifdef USE_64_BIT_ARCHIVE
 745   BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_64_bit),
 746 #else
 747   BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
 748 #endif
 749   BFD_JUMP_TABLE_SYMBOLS (bfd_plugin),
 750   BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 751   BFD_JUMP_TABLE_WRITE (bfd_plugin),
 752   BFD_JUMP_TABLE_LINK (bfd_plugin),
 753   BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 754
 755   NULL,
 756
 757   NULL                          /* backend_data.  */
 758 };
 759 #endif /* BFD_SUPPORTS_PLUGIN */