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