| 1 | /* Plugin support for BFD. |
| 2 | Copyright 2009 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program 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 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program 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 this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "config.h" |
| 23 | #include <assert.h> |
| 24 | #include <dlfcn.h> |
| 25 | #include <stdarg.h> |
| 26 | #include "plugin-api.h" |
| 27 | #include "sysdep.h" |
| 28 | #include "plugin.h" |
| 29 | #include "libbfd.h" |
| 30 | #include "libiberty.h" |
| 31 | #include <dirent.h> |
| 32 | |
| 33 | #define bfd_plugin_close_and_cleanup _bfd_generic_close_and_cleanup |
| 34 | #define bfd_plugin_bfd_free_cached_info _bfd_generic_bfd_free_cached_info |
| 35 | #define bfd_plugin_new_section_hook _bfd_generic_new_section_hook |
| 36 | #define bfd_plugin_get_section_contents _bfd_generic_get_section_contents |
| 37 | #define bfd_plugin_get_section_contents_in_window _bfd_generic_get_section_contents_in_window |
| 38 | #define bfd_plugin_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data |
| 39 | #define bfd_plugin_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data |
| 40 | #define bfd_plugin_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data |
| 41 | #define bfd_plugin_bfd_set_private_flags _bfd_generic_bfd_set_private_flags |
| 42 | #define bfd_plugin_core_file_matches_executable_p generic_core_file_matches_executable_p |
| 43 | #define bfd_plugin_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name |
| 44 | #define bfd_plugin_bfd_is_target_special_symbol ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false) |
| 45 | #define bfd_plugin_get_lineno _bfd_nosymbols_get_lineno |
| 46 | #define bfd_plugin_find_nearest_line _bfd_nosymbols_find_nearest_line |
| 47 | #define bfd_plugin_find_inliner_info _bfd_nosymbols_find_inliner_info |
| 48 | #define bfd_plugin_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol |
| 49 | #define bfd_plugin_read_minisymbols _bfd_generic_read_minisymbols |
| 50 | #define bfd_plugin_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol |
| 51 | #define bfd_plugin_set_arch_mach bfd_default_set_arch_mach |
| 52 | #define bfd_plugin_set_section_contents _bfd_generic_set_section_contents |
| 53 | #define bfd_plugin_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents |
| 54 | #define bfd_plugin_bfd_relax_section bfd_generic_relax_section |
| 55 | #define bfd_plugin_bfd_link_hash_table_create _bfd_generic_link_hash_table_create |
| 56 | #define bfd_plugin_bfd_link_hash_table_free _bfd_generic_link_hash_table_free |
| 57 | #define bfd_plugin_bfd_link_add_symbols _bfd_generic_link_add_symbols |
| 58 | #define bfd_plugin_bfd_link_just_syms _bfd_generic_link_just_syms |
| 59 | #define bfd_plugin_bfd_final_link _bfd_generic_final_link |
| 60 | #define bfd_plugin_bfd_link_split_section _bfd_generic_link_split_section |
| 61 | #define bfd_plugin_bfd_gc_sections bfd_generic_gc_sections |
| 62 | #define bfd_plugin_bfd_merge_sections bfd_generic_merge_sections |
| 63 | #define bfd_plugin_bfd_is_group_section bfd_generic_is_group_section |
| 64 | #define bfd_plugin_bfd_discard_group bfd_generic_discard_group |
| 65 | #define bfd_plugin_section_already_linked _bfd_generic_section_already_linked |
| 66 | #define bfd_plugin_bfd_define_common_symbol bfd_generic_define_common_symbol |
| 67 | |
| 68 | static enum ld_plugin_status |
| 69 | message (int level ATTRIBUTE_UNUSED, |
| 70 | const char * format, ...) |
| 71 | { |
| 72 | va_list args; |
| 73 | va_start (args, format); |
| 74 | printf ("bfd plugin: "); |
| 75 | vprintf (format, args); |
| 76 | va_end (args); |
| 77 | return LDPS_OK; |
| 78 | } |
| 79 | |
| 80 | /* Register a claim-file handler. */ |
| 81 | static ld_plugin_claim_file_handler claim_file; |
| 82 | |
| 83 | static enum ld_plugin_status |
| 84 | register_claim_file (ld_plugin_claim_file_handler handler) |
| 85 | { |
| 86 | claim_file = handler; |
| 87 | return LDPS_OK; |
| 88 | } |
| 89 | |
| 90 | static enum ld_plugin_status |
| 91 | add_symbols (void * handle, |
| 92 | int nsyms, |
| 93 | const struct ld_plugin_symbol * syms) |
| 94 | { |
| 95 | bfd *abfd = handle; |
| 96 | struct plugin_data_struct *plugin_data = |
| 97 | bfd_alloc (abfd, sizeof (plugin_data_struct));; |
| 98 | |
| 99 | plugin_data->nsyms = nsyms; |
| 100 | plugin_data->syms = syms; |
| 101 | |
| 102 | if (nsyms != 0) |
| 103 | abfd->flags |= HAS_SYMS; |
| 104 | |
| 105 | abfd->tdata.plugin_data = plugin_data; |
| 106 | return LDPS_OK; |
| 107 | } |
| 108 | |
| 109 | static const char *plugin_program_name; |
| 110 | |
| 111 | void |
| 112 | bfd_plugin_set_program_name (const char *program_name) |
| 113 | { |
| 114 | plugin_program_name = program_name; |
| 115 | } |
| 116 | |
| 117 | static int |
| 118 | try_load_plugin (const char *pname) |
| 119 | { |
| 120 | static void *plugin_handle; |
| 121 | int tv_size = 4; |
| 122 | struct ld_plugin_tv tv[tv_size]; |
| 123 | int i; |
| 124 | ld_plugin_onload onload; |
| 125 | enum ld_plugin_status status; |
| 126 | |
| 127 | plugin_handle = dlopen (pname, RTLD_NOW); |
| 128 | if (!plugin_handle) |
| 129 | { |
| 130 | (*_bfd_error_handler)("%s\n", dlerror ()); |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | onload = dlsym (plugin_handle, "onload"); |
| 135 | if (!onload) |
| 136 | goto err; |
| 137 | |
| 138 | i = 0; |
| 139 | tv[i].tv_tag = LDPT_MESSAGE; |
| 140 | tv[i].tv_u.tv_message = message; |
| 141 | |
| 142 | ++i; |
| 143 | tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK; |
| 144 | tv[i].tv_u.tv_register_claim_file = register_claim_file; |
| 145 | |
| 146 | ++i; |
| 147 | tv[i].tv_tag = LDPT_ADD_SYMBOLS; |
| 148 | tv[i].tv_u.tv_add_symbols = add_symbols; |
| 149 | |
| 150 | ++i; |
| 151 | tv[i].tv_tag = LDPT_NULL; |
| 152 | tv[i].tv_u.tv_val = 0; |
| 153 | |
| 154 | status = (*onload)(tv); |
| 155 | |
| 156 | if (status != LDPS_OK) |
| 157 | goto err; |
| 158 | |
| 159 | if (!claim_file) |
| 160 | goto err; |
| 161 | |
| 162 | return 1; |
| 163 | |
| 164 | err: |
| 165 | plugin_handle = NULL; |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static const char *plugin_name; |
| 170 | |
| 171 | void |
| 172 | bfd_plugin_set_plugin (const char *p) |
| 173 | { |
| 174 | plugin_name = p; |
| 175 | } |
| 176 | |
| 177 | static int |
| 178 | load_plugin (void) |
| 179 | { |
| 180 | char *plugin_dir; |
| 181 | char *p; |
| 182 | DIR *d; |
| 183 | struct dirent *ent; |
| 184 | int found = 0; |
| 185 | |
| 186 | if (plugin_name) |
| 187 | return try_load_plugin (plugin_name); |
| 188 | |
| 189 | if (plugin_program_name == NULL) |
| 190 | return 0; |
| 191 | |
| 192 | plugin_dir = concat (BINDIR, "/../lib/bfd-plugins", NULL); |
| 193 | p = make_relative_prefix (plugin_program_name, |
| 194 | BINDIR, |
| 195 | plugin_dir); |
| 196 | free (plugin_dir); |
| 197 | plugin_dir = NULL; |
| 198 | |
| 199 | d = opendir (p); |
| 200 | if (!d) |
| 201 | goto out; |
| 202 | |
| 203 | while ((ent = readdir (d))) |
| 204 | { |
| 205 | char *full_name; |
| 206 | struct stat s; |
| 207 | |
| 208 | full_name = concat (p, "/", ent->d_name, NULL); |
| 209 | if (stat(full_name, &s) == 0 && S_ISREG (s.st_mode)) |
| 210 | found = try_load_plugin (full_name); |
| 211 | free (full_name); |
| 212 | if (found) |
| 213 | break; |
| 214 | } |
| 215 | |
| 216 | out: |
| 217 | free (p); |
| 218 | if (d) |
| 219 | closedir (d); |
| 220 | |
| 221 | return found; |
| 222 | } |
| 223 | |
| 224 | |
| 225 | static const bfd_target * |
| 226 | bfd_plugin_object_p (bfd *abfd) |
| 227 | { |
| 228 | int claimed = 0; |
| 229 | int t = load_plugin (); |
| 230 | struct ld_plugin_input_file file; |
| 231 | if (!t) |
| 232 | return NULL; |
| 233 | |
| 234 | file.name = abfd->filename; |
| 235 | |
| 236 | if (abfd->iostream) |
| 237 | { |
| 238 | file.fd = fileno (abfd->iostream); |
| 239 | file.offset = 0; |
| 240 | file.filesize = 0; /*FIXME*/ |
| 241 | } |
| 242 | else |
| 243 | { |
| 244 | bfd *archive = abfd->my_archive; |
| 245 | BFD_ASSERT (archive); |
| 246 | file.fd = fileno (archive->iostream); |
| 247 | file.offset = abfd->origin; |
| 248 | file.filesize = arelt_size (abfd); |
| 249 | |
| 250 | } |
| 251 | file.handle = abfd; |
| 252 | claim_file (&file, &claimed); |
| 253 | if (!claimed) |
| 254 | return NULL; |
| 255 | |
| 256 | return abfd->xvec; |
| 257 | } |
| 258 | |
| 259 | /* Copy any private info we understand from the input bfd |
| 260 | to the output bfd. */ |
| 261 | |
| 262 | static bfd_boolean |
| 263 | bfd_plugin_bfd_copy_private_bfd_data (bfd *ibfd ATTRIBUTE_UNUSED, |
| 264 | bfd *obfd ATTRIBUTE_UNUSED) |
| 265 | { |
| 266 | BFD_ASSERT (0); |
| 267 | return TRUE; |
| 268 | } |
| 269 | |
| 270 | /* Copy any private info we understand from the input section |
| 271 | to the output section. */ |
| 272 | |
| 273 | static bfd_boolean |
| 274 | bfd_plugin_bfd_copy_private_section_data (bfd *ibfd ATTRIBUTE_UNUSED, |
| 275 | asection *isection ATTRIBUTE_UNUSED, |
| 276 | bfd *obfd ATTRIBUTE_UNUSED, |
| 277 | asection *osection ATTRIBUTE_UNUSED) |
| 278 | { |
| 279 | BFD_ASSERT (0); |
| 280 | return TRUE; |
| 281 | } |
| 282 | |
| 283 | /* Copy any private info we understand from the input symbol |
| 284 | to the output symbol. */ |
| 285 | |
| 286 | static bfd_boolean |
| 287 | bfd_plugin_bfd_copy_private_symbol_data (bfd *ibfd ATTRIBUTE_UNUSED, |
| 288 | asymbol *isymbol ATTRIBUTE_UNUSED, |
| 289 | bfd *obfd ATTRIBUTE_UNUSED, |
| 290 | asymbol *osymbol ATTRIBUTE_UNUSED) |
| 291 | { |
| 292 | BFD_ASSERT (0); |
| 293 | return TRUE; |
| 294 | } |
| 295 | |
| 296 | static bfd_boolean |
| 297 | bfd_plugin_bfd_print_private_bfd_data (bfd *abfd ATTRIBUTE_UNUSED, PTR ptr ATTRIBUTE_UNUSED) |
| 298 | { |
| 299 | BFD_ASSERT (0); |
| 300 | return TRUE; |
| 301 | } |
| 302 | |
| 303 | static char * |
| 304 | bfd_plugin_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED) |
| 305 | { |
| 306 | BFD_ASSERT (0); |
| 307 | return NULL; |
| 308 | } |
| 309 | |
| 310 | static int |
| 311 | bfd_plugin_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED) |
| 312 | { |
| 313 | BFD_ASSERT (0); |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | static long |
| 318 | bfd_plugin_get_symtab_upper_bound (bfd *abfd) |
| 319 | { |
| 320 | struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data; |
| 321 | long nsyms = plugin_data->nsyms; |
| 322 | |
| 323 | BFD_ASSERT (nsyms >= 0); |
| 324 | |
| 325 | return ((nsyms + 1) * sizeof (asymbol *)); |
| 326 | } |
| 327 | |
| 328 | static flagword |
| 329 | convert_flags (const struct ld_plugin_symbol *sym) |
| 330 | { |
| 331 | switch (sym->def) |
| 332 | { |
| 333 | case LDPK_DEF: |
| 334 | case LDPK_COMMON: |
| 335 | case LDPK_UNDEF: |
| 336 | return BSF_GLOBAL; |
| 337 | |
| 338 | case LDPK_WEAKUNDEF: |
| 339 | case LDPK_WEAKDEF: |
| 340 | return BSF_GLOBAL | BSF_WEAK; |
| 341 | |
| 342 | default: |
| 343 | BFD_ASSERT (0); |
| 344 | return 0; |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | static long |
| 349 | bfd_plugin_canonicalize_symtab (bfd *abfd, |
| 350 | asymbol **alocation) |
| 351 | { |
| 352 | struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data; |
| 353 | long nsyms = plugin_data->nsyms; |
| 354 | const struct ld_plugin_symbol *syms = plugin_data->syms; |
| 355 | static asection fake_section; |
| 356 | static asection fake_common_section; |
| 357 | int i; |
| 358 | |
| 359 | fake_section.name = ".text"; |
| 360 | fake_common_section.flags = SEC_IS_COMMON; |
| 361 | |
| 362 | for (i = 0; i < nsyms; i++) |
| 363 | { |
| 364 | asymbol *s = bfd_alloc (abfd, sizeof (asymbol)); |
| 365 | |
| 366 | BFD_ASSERT (s); |
| 367 | alocation[i] = s; |
| 368 | |
| 369 | s->the_bfd = abfd; |
| 370 | s->name = syms[i].name; |
| 371 | s->value = 0; |
| 372 | s->flags = convert_flags (&syms[i]); |
| 373 | switch (syms[i].def) |
| 374 | { |
| 375 | case LDPK_COMMON: |
| 376 | s->section = &fake_common_section; |
| 377 | break; |
| 378 | case LDPK_UNDEF: |
| 379 | case LDPK_WEAKUNDEF: |
| 380 | s->section = bfd_und_section_ptr; |
| 381 | break; |
| 382 | case LDPK_DEF: |
| 383 | case LDPK_WEAKDEF: |
| 384 | s->section = &fake_section; |
| 385 | break; |
| 386 | default: |
| 387 | BFD_ASSERT (0); |
| 388 | } |
| 389 | |
| 390 | s->udata.p = (void *) &syms[i]; |
| 391 | } |
| 392 | |
| 393 | return nsyms; |
| 394 | } |
| 395 | |
| 396 | static void |
| 397 | bfd_plugin_print_symbol (bfd *abfd ATTRIBUTE_UNUSED, |
| 398 | PTR afile ATTRIBUTE_UNUSED, |
| 399 | asymbol *symbol ATTRIBUTE_UNUSED, |
| 400 | bfd_print_symbol_type how ATTRIBUTE_UNUSED) |
| 401 | { |
| 402 | BFD_ASSERT (0); |
| 403 | } |
| 404 | |
| 405 | static void |
| 406 | bfd_plugin_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED, |
| 407 | asymbol *symbol, |
| 408 | symbol_info *ret) |
| 409 | { |
| 410 | bfd_symbol_info (symbol, ret); |
| 411 | } |
| 412 | |
| 413 | /* Make an empty symbol. */ |
| 414 | |
| 415 | static asymbol * |
| 416 | bfd_plugin_make_empty_symbol (bfd *abfd) |
| 417 | { |
| 418 | asymbol *new = bfd_zalloc (abfd, sizeof (asymbol)); |
| 419 | if (new == NULL) |
| 420 | return new; |
| 421 | new->the_bfd = abfd; |
| 422 | return new; |
| 423 | } |
| 424 | |
| 425 | static int |
| 426 | bfd_plugin_sizeof_headers (bfd *a ATTRIBUTE_UNUSED, |
| 427 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 428 | { |
| 429 | BFD_ASSERT (0); |
| 430 | return 0; |
| 431 | } |
| 432 | |
| 433 | static bfd_boolean |
| 434 | bfd_plugin_mkobject (bfd *abfd ATTRIBUTE_UNUSED) |
| 435 | { |
| 436 | BFD_ASSERT (0); |
| 437 | return 0; |
| 438 | } |
| 439 | |
| 440 | const bfd_target plugin_vec = |
| 441 | { |
| 442 | "plugin", /* Name. */ |
| 443 | bfd_target_unknown_flavour, |
| 444 | BFD_ENDIAN_LITTLE, /* Target byte order. */ |
| 445 | BFD_ENDIAN_LITTLE, /* Target headers byte order. */ |
| 446 | (HAS_RELOC | EXEC_P | /* Object flags. */ |
| 447 | HAS_LINENO | HAS_DEBUG | |
| 448 | HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED), |
| 449 | (SEC_CODE | SEC_DATA | SEC_ROM | SEC_HAS_CONTENTS |
| 450 | | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* Section flags. */ |
| 451 | 0, /* symbol_leading_char. */ |
| 452 | '/', /* ar_pad_char. */ |
| 453 | 15, /* ar_max_namelen. */ |
| 454 | |
| 455 | bfd_getl64, bfd_getl_signed_64, bfd_putl64, |
| 456 | bfd_getl32, bfd_getl_signed_32, bfd_putl32, |
| 457 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */ |
| 458 | bfd_getl64, bfd_getl_signed_64, bfd_putl64, |
| 459 | bfd_getl32, bfd_getl_signed_32, bfd_putl32, |
| 460 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */ |
| 461 | |
| 462 | { /* bfd_check_format. */ |
| 463 | _bfd_dummy_target, |
| 464 | bfd_plugin_object_p, |
| 465 | bfd_generic_archive_p, |
| 466 | _bfd_dummy_target |
| 467 | }, |
| 468 | { /* bfd_set_format. */ |
| 469 | bfd_false, |
| 470 | bfd_plugin_mkobject, |
| 471 | _bfd_generic_mkarchive, |
| 472 | bfd_false, |
| 473 | }, |
| 474 | { /* bfd_write_contents. */ |
| 475 | bfd_false, |
| 476 | bfd_false, |
| 477 | _bfd_write_archive_contents, |
| 478 | bfd_false, |
| 479 | }, |
| 480 | |
| 481 | BFD_JUMP_TABLE_GENERIC (bfd_plugin), |
| 482 | BFD_JUMP_TABLE_COPY (bfd_plugin), |
| 483 | BFD_JUMP_TABLE_CORE (bfd_plugin), |
| 484 | BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff), |
| 485 | BFD_JUMP_TABLE_SYMBOLS (bfd_plugin), |
| 486 | BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), |
| 487 | BFD_JUMP_TABLE_WRITE (bfd_plugin), |
| 488 | BFD_JUMP_TABLE_LINK (bfd_plugin), |
| 489 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), |
| 490 | |
| 491 | NULL, |
| 492 | |
| 493 | NULL /* backend_data. */ |
| 494 | }; |