| 1 | /* Plugin control for the GNU linker. |
| 2 | Copyright (C) 2010-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of the GNU Binutils. |
| 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 "libiberty.h" |
| 23 | #include "bfd.h" |
| 24 | #include "bfdlink.h" |
| 25 | #include "bfdver.h" |
| 26 | #include "ctf-api.h" |
| 27 | #include "ld.h" |
| 28 | #include "ldmain.h" |
| 29 | #include "ldmisc.h" |
| 30 | #include "ldexp.h" |
| 31 | #include "ldlang.h" |
| 32 | #include "ldfile.h" |
| 33 | #include "plugin-api.h" |
| 34 | #include "../bfd/plugin.h" |
| 35 | #include "plugin.h" |
| 36 | #include "elf-bfd.h" |
| 37 | #if HAVE_MMAP |
| 38 | # include <sys/mman.h> |
| 39 | # ifndef MAP_FAILED |
| 40 | # define MAP_FAILED ((void *) -1) |
| 41 | # endif |
| 42 | # ifndef PROT_READ |
| 43 | # define PROT_READ 0 |
| 44 | # endif |
| 45 | # ifndef MAP_PRIVATE |
| 46 | # define MAP_PRIVATE 0 |
| 47 | # endif |
| 48 | #endif |
| 49 | #include <errno.h> |
| 50 | #if !(defined(errno) || defined(_MSC_VER) && defined(_INC_ERRNO)) |
| 51 | extern int errno; |
| 52 | #endif |
| 53 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
| 54 | #include <windows.h> |
| 55 | #endif |
| 56 | |
| 57 | /* Report plugin symbols. */ |
| 58 | bfd_boolean report_plugin_symbols; |
| 59 | |
| 60 | /* The suffix to append to the name of the real (claimed) object file |
| 61 | when generating a dummy BFD to hold the IR symbols sent from the |
| 62 | plugin. For cosmetic use only; appears in maps, crefs etc. */ |
| 63 | #define IRONLY_SUFFIX " (symbol from plugin)" |
| 64 | |
| 65 | /* Stores a single argument passed to a plugin. */ |
| 66 | typedef struct plugin_arg |
| 67 | { |
| 68 | struct plugin_arg *next; |
| 69 | const char *arg; |
| 70 | } plugin_arg_t; |
| 71 | |
| 72 | /* Holds all details of a single plugin. */ |
| 73 | typedef struct plugin |
| 74 | { |
| 75 | /* Next on the list of plugins, or NULL at end of chain. */ |
| 76 | struct plugin *next; |
| 77 | /* The argument string given to --plugin. */ |
| 78 | const char *name; |
| 79 | /* The shared library handle returned by dlopen. */ |
| 80 | void *dlhandle; |
| 81 | /* The list of argument string given to --plugin-opt. */ |
| 82 | plugin_arg_t *args; |
| 83 | /* Number of args in the list, for convenience. */ |
| 84 | size_t n_args; |
| 85 | /* The plugin's event handlers. */ |
| 86 | ld_plugin_claim_file_handler claim_file_handler; |
| 87 | ld_plugin_all_symbols_read_handler all_symbols_read_handler; |
| 88 | ld_plugin_cleanup_handler cleanup_handler; |
| 89 | /* TRUE if the cleanup handlers have been called. */ |
| 90 | bfd_boolean cleanup_done; |
| 91 | } plugin_t; |
| 92 | |
| 93 | typedef struct view_buffer |
| 94 | { |
| 95 | char *addr; |
| 96 | size_t filesize; |
| 97 | off_t offset; |
| 98 | } view_buffer_t; |
| 99 | |
| 100 | /* The internal version of struct ld_plugin_input_file with a BFD |
| 101 | pointer. */ |
| 102 | typedef struct plugin_input_file |
| 103 | { |
| 104 | bfd *abfd; |
| 105 | view_buffer_t view_buffer; |
| 106 | char *name; |
| 107 | int fd; |
| 108 | bfd_boolean use_mmap; |
| 109 | off_t offset; |
| 110 | off_t filesize; |
| 111 | } plugin_input_file_t; |
| 112 | |
| 113 | /* The master list of all plugins. */ |
| 114 | static plugin_t *plugins_list = NULL; |
| 115 | |
| 116 | /* We keep a tail pointer for easy linking on the end. */ |
| 117 | static plugin_t **plugins_tail_chain_ptr = &plugins_list; |
| 118 | |
| 119 | /* The last plugin added to the list, for receiving args. */ |
| 120 | static plugin_t *last_plugin = NULL; |
| 121 | |
| 122 | /* The tail of the arg chain of the last plugin added to the list. */ |
| 123 | static plugin_arg_t **last_plugin_args_tail_chain_ptr = NULL; |
| 124 | |
| 125 | /* The plugin which is currently having a callback executed. */ |
| 126 | static plugin_t *called_plugin = NULL; |
| 127 | |
| 128 | /* Last plugin to cause an error, if any. */ |
| 129 | static const char *error_plugin = NULL; |
| 130 | |
| 131 | /* State of linker "notice" interface before we poked at it. */ |
| 132 | static bfd_boolean orig_notice_all; |
| 133 | |
| 134 | /* Original linker callbacks, and the plugin version. */ |
| 135 | static const struct bfd_link_callbacks *orig_callbacks; |
| 136 | static struct bfd_link_callbacks plugin_callbacks; |
| 137 | |
| 138 | /* Set at all symbols read time, to avoid recursively offering the plugin |
| 139 | its own newly-added input files and libs to claim. */ |
| 140 | bfd_boolean no_more_claiming = FALSE; |
| 141 | |
| 142 | #if HAVE_MMAP && HAVE_GETPAGESIZE |
| 143 | /* Page size used by mmap. */ |
| 144 | static off_t plugin_pagesize; |
| 145 | #endif |
| 146 | |
| 147 | /* List of tags to set in the constant leading part of the tv array. */ |
| 148 | static const enum ld_plugin_tag tv_header_tags[] = |
| 149 | { |
| 150 | LDPT_MESSAGE, |
| 151 | LDPT_API_VERSION, |
| 152 | LDPT_GNU_LD_VERSION, |
| 153 | LDPT_LINKER_OUTPUT, |
| 154 | LDPT_OUTPUT_NAME, |
| 155 | LDPT_REGISTER_CLAIM_FILE_HOOK, |
| 156 | LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK, |
| 157 | LDPT_REGISTER_CLEANUP_HOOK, |
| 158 | LDPT_ADD_SYMBOLS, |
| 159 | LDPT_GET_INPUT_FILE, |
| 160 | LDPT_GET_VIEW, |
| 161 | LDPT_RELEASE_INPUT_FILE, |
| 162 | LDPT_GET_SYMBOLS, |
| 163 | LDPT_GET_SYMBOLS_V2, |
| 164 | LDPT_ADD_INPUT_FILE, |
| 165 | LDPT_ADD_INPUT_LIBRARY, |
| 166 | LDPT_SET_EXTRA_LIBRARY_PATH |
| 167 | }; |
| 168 | |
| 169 | /* How many entries in the constant leading part of the tv array. */ |
| 170 | static const size_t tv_header_size = ARRAY_SIZE (tv_header_tags); |
| 171 | |
| 172 | /* Forward references. */ |
| 173 | static bfd_boolean plugin_notice (struct bfd_link_info *, |
| 174 | struct bfd_link_hash_entry *, |
| 175 | struct bfd_link_hash_entry *, |
| 176 | bfd *, asection *, bfd_vma, flagword); |
| 177 | |
| 178 | static const bfd_target * plugin_object_p (bfd *); |
| 179 | |
| 180 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
| 181 | |
| 182 | #define RTLD_NOW 0 /* Dummy value. */ |
| 183 | |
| 184 | static void * |
| 185 | dlopen (const char *file, int mode ATTRIBUTE_UNUSED) |
| 186 | { |
| 187 | return LoadLibrary (file); |
| 188 | } |
| 189 | |
| 190 | static void * |
| 191 | dlsym (void *handle, const char *name) |
| 192 | { |
| 193 | return GetProcAddress (handle, name); |
| 194 | } |
| 195 | |
| 196 | static int |
| 197 | dlclose (void *handle) |
| 198 | { |
| 199 | FreeLibrary (handle); |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */ |
| 204 | |
| 205 | #ifndef HAVE_DLFCN_H |
| 206 | static const char * |
| 207 | dlerror (void) |
| 208 | { |
| 209 | return ""; |
| 210 | } |
| 211 | #endif |
| 212 | |
| 213 | /* Helper function for exiting with error status. */ |
| 214 | static int |
| 215 | set_plugin_error (const char *plugin) |
| 216 | { |
| 217 | error_plugin = plugin; |
| 218 | return -1; |
| 219 | } |
| 220 | |
| 221 | /* Test if an error occurred. */ |
| 222 | static bfd_boolean |
| 223 | plugin_error_p (void) |
| 224 | { |
| 225 | return error_plugin != NULL; |
| 226 | } |
| 227 | |
| 228 | /* Return name of plugin which caused an error if any. */ |
| 229 | const char * |
| 230 | plugin_error_plugin (void) |
| 231 | { |
| 232 | return error_plugin ? error_plugin : _("<no plugin>"); |
| 233 | } |
| 234 | |
| 235 | /* Handle -plugin arg: find and load plugin, or return error. */ |
| 236 | void |
| 237 | plugin_opt_plugin (const char *plugin) |
| 238 | { |
| 239 | plugin_t *newplug; |
| 240 | plugin_t *curplug = plugins_list; |
| 241 | |
| 242 | newplug = xmalloc (sizeof *newplug); |
| 243 | memset (newplug, 0, sizeof *newplug); |
| 244 | newplug->name = plugin; |
| 245 | newplug->dlhandle = dlopen (plugin, RTLD_NOW); |
| 246 | if (!newplug->dlhandle) |
| 247 | einfo (_("%F%P: %s: error loading plugin: %s\n"), plugin, dlerror ()); |
| 248 | |
| 249 | /* Check if plugin has been loaded already. */ |
| 250 | while (curplug) |
| 251 | { |
| 252 | if (newplug->dlhandle == curplug->dlhandle) |
| 253 | { |
| 254 | einfo (_("%P: %s: duplicated plugin\n"), plugin); |
| 255 | free (newplug); |
| 256 | return; |
| 257 | } |
| 258 | curplug = curplug->next; |
| 259 | } |
| 260 | |
| 261 | /* Chain on end, so when we run list it is in command-line order. */ |
| 262 | *plugins_tail_chain_ptr = newplug; |
| 263 | plugins_tail_chain_ptr = &newplug->next; |
| 264 | |
| 265 | /* Record it as current plugin for receiving args. */ |
| 266 | last_plugin = newplug; |
| 267 | last_plugin_args_tail_chain_ptr = &newplug->args; |
| 268 | } |
| 269 | |
| 270 | /* Accumulate option arguments for last-loaded plugin, or return |
| 271 | error if none. */ |
| 272 | int |
| 273 | plugin_opt_plugin_arg (const char *arg) |
| 274 | { |
| 275 | plugin_arg_t *newarg; |
| 276 | |
| 277 | if (!last_plugin) |
| 278 | return set_plugin_error (_("<no plugin>")); |
| 279 | |
| 280 | /* Ignore -pass-through= from GCC driver. */ |
| 281 | if (*arg == '-') |
| 282 | { |
| 283 | const char *p = arg + 1; |
| 284 | |
| 285 | if (*p == '-') |
| 286 | ++p; |
| 287 | if (strncmp (p, "pass-through=", 13) == 0) |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | newarg = xmalloc (sizeof *newarg); |
| 292 | newarg->arg = arg; |
| 293 | newarg->next = NULL; |
| 294 | |
| 295 | /* Chain on end to preserve command-line order. */ |
| 296 | *last_plugin_args_tail_chain_ptr = newarg; |
| 297 | last_plugin_args_tail_chain_ptr = &newarg->next; |
| 298 | last_plugin->n_args++; |
| 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | /* Generate a dummy BFD to represent an IR file, for any callers of |
| 303 | plugin_call_claim_file to use as the handle in the ld_plugin_input_file |
| 304 | struct that they build to pass in. The BFD is initially writable, so |
| 305 | that symbols can be added to it; it must be made readable after the |
| 306 | add_symbols hook has been called so that it can be read when linking. */ |
| 307 | static bfd * |
| 308 | plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate) |
| 309 | { |
| 310 | bfd *abfd; |
| 311 | bfd_boolean bfd_plugin_target; |
| 312 | |
| 313 | bfd_use_reserved_id = 1; |
| 314 | bfd_plugin_target = bfd_plugin_target_p (srctemplate->xvec); |
| 315 | abfd = bfd_create (concat (name, IRONLY_SUFFIX, (const char *) NULL), |
| 316 | bfd_plugin_target ? link_info.output_bfd : srctemplate); |
| 317 | if (abfd != NULL) |
| 318 | { |
| 319 | abfd->flags |= BFD_LINKER_CREATED | BFD_PLUGIN; |
| 320 | if (!bfd_make_writable (abfd)) |
| 321 | goto report_error; |
| 322 | if (!bfd_plugin_target) |
| 323 | { |
| 324 | bfd_set_arch_info (abfd, bfd_get_arch_info (srctemplate)); |
| 325 | bfd_set_gp_size (abfd, bfd_get_gp_size (srctemplate)); |
| 326 | if (!bfd_copy_private_bfd_data (srctemplate, abfd)) |
| 327 | goto report_error; |
| 328 | } |
| 329 | { |
| 330 | flagword flags; |
| 331 | |
| 332 | /* Create section to own the symbols. */ |
| 333 | flags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY |
| 334 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE); |
| 335 | if (bfd_make_section_anyway_with_flags (abfd, ".text", flags)) |
| 336 | return abfd; |
| 337 | } |
| 338 | } |
| 339 | report_error: |
| 340 | einfo (_("%F%P: could not create dummy IR bfd: %E\n")); |
| 341 | return NULL; |
| 342 | } |
| 343 | |
| 344 | /* Check if the BFD passed in is an IR dummy object file. */ |
| 345 | static inline bfd_boolean |
| 346 | is_ir_dummy_bfd (const bfd *abfd) |
| 347 | { |
| 348 | /* ABFD can sometimes legitimately be NULL, e.g. when called from one |
| 349 | of the linker callbacks for a symbol in the *ABS* or *UND* sections. */ |
| 350 | return abfd != NULL && (abfd->flags & BFD_PLUGIN) != 0; |
| 351 | } |
| 352 | |
| 353 | /* Helpers to convert between BFD and GOLD symbol formats. */ |
| 354 | static enum ld_plugin_status |
| 355 | asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym, |
| 356 | const struct ld_plugin_symbol *ldsym) |
| 357 | { |
| 358 | flagword flags = BSF_NO_FLAGS; |
| 359 | struct bfd_section *section; |
| 360 | |
| 361 | asym->the_bfd = abfd; |
| 362 | asym->name = (ldsym->version |
| 363 | ? concat (ldsym->name, "@", ldsym->version, (const char *) NULL) |
| 364 | : ldsym->name); |
| 365 | asym->value = 0; |
| 366 | switch (ldsym->def) |
| 367 | { |
| 368 | case LDPK_WEAKDEF: |
| 369 | flags = BSF_WEAK; |
| 370 | /* FALLTHRU */ |
| 371 | case LDPK_DEF: |
| 372 | flags |= BSF_GLOBAL; |
| 373 | if (ldsym->comdat_key) |
| 374 | { |
| 375 | char *name = concat (".gnu.linkonce.t.", ldsym->comdat_key, |
| 376 | (const char *) NULL); |
| 377 | section = bfd_get_section_by_name (abfd, name); |
| 378 | if (section != NULL) |
| 379 | free (name); |
| 380 | else |
| 381 | { |
| 382 | flagword sflags; |
| 383 | |
| 384 | sflags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY |
| 385 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE |
| 386 | | SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD); |
| 387 | section = bfd_make_section_anyway_with_flags (abfd, name, sflags); |
| 388 | if (section == NULL) |
| 389 | return LDPS_ERR; |
| 390 | } |
| 391 | } |
| 392 | else |
| 393 | section = bfd_get_section_by_name (abfd, ".text"); |
| 394 | break; |
| 395 | |
| 396 | case LDPK_WEAKUNDEF: |
| 397 | flags = BSF_WEAK; |
| 398 | /* FALLTHRU */ |
| 399 | case LDPK_UNDEF: |
| 400 | section = bfd_und_section_ptr; |
| 401 | break; |
| 402 | |
| 403 | case LDPK_COMMON: |
| 404 | flags = BSF_GLOBAL; |
| 405 | section = bfd_com_section_ptr; |
| 406 | asym->value = ldsym->size; |
| 407 | break; |
| 408 | |
| 409 | default: |
| 410 | return LDPS_ERR; |
| 411 | } |
| 412 | asym->flags = flags; |
| 413 | asym->section = section; |
| 414 | |
| 415 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
| 416 | { |
| 417 | elf_symbol_type *elfsym = elf_symbol_from (abfd, asym); |
| 418 | unsigned char visibility; |
| 419 | |
| 420 | if (!elfsym) |
| 421 | einfo (_("%F%P: %s: non-ELF symbol in ELF BFD!\n"), asym->name); |
| 422 | |
| 423 | if (ldsym->def == LDPK_COMMON) |
| 424 | { |
| 425 | elfsym->internal_elf_sym.st_shndx = SHN_COMMON; |
| 426 | elfsym->internal_elf_sym.st_value = 1; |
| 427 | } |
| 428 | |
| 429 | switch (ldsym->visibility) |
| 430 | { |
| 431 | default: |
| 432 | einfo (_("%F%P: unknown ELF symbol visibility: %d!\n"), |
| 433 | ldsym->visibility); |
| 434 | return LDPS_ERR; |
| 435 | |
| 436 | case LDPV_DEFAULT: |
| 437 | visibility = STV_DEFAULT; |
| 438 | break; |
| 439 | case LDPV_PROTECTED: |
| 440 | visibility = STV_PROTECTED; |
| 441 | break; |
| 442 | case LDPV_INTERNAL: |
| 443 | visibility = STV_INTERNAL; |
| 444 | break; |
| 445 | case LDPV_HIDDEN: |
| 446 | visibility = STV_HIDDEN; |
| 447 | break; |
| 448 | } |
| 449 | elfsym->internal_elf_sym.st_other |= visibility; |
| 450 | } |
| 451 | |
| 452 | return LDPS_OK; |
| 453 | } |
| 454 | |
| 455 | /* Register a claim-file handler. */ |
| 456 | static enum ld_plugin_status |
| 457 | register_claim_file (ld_plugin_claim_file_handler handler) |
| 458 | { |
| 459 | ASSERT (called_plugin); |
| 460 | called_plugin->claim_file_handler = handler; |
| 461 | return LDPS_OK; |
| 462 | } |
| 463 | |
| 464 | /* Register an all-symbols-read handler. */ |
| 465 | static enum ld_plugin_status |
| 466 | register_all_symbols_read (ld_plugin_all_symbols_read_handler handler) |
| 467 | { |
| 468 | ASSERT (called_plugin); |
| 469 | called_plugin->all_symbols_read_handler = handler; |
| 470 | return LDPS_OK; |
| 471 | } |
| 472 | |
| 473 | /* Register a cleanup handler. */ |
| 474 | static enum ld_plugin_status |
| 475 | register_cleanup (ld_plugin_cleanup_handler handler) |
| 476 | { |
| 477 | ASSERT (called_plugin); |
| 478 | called_plugin->cleanup_handler = handler; |
| 479 | return LDPS_OK; |
| 480 | } |
| 481 | |
| 482 | /* Add symbols from a plugin-claimed input file. */ |
| 483 | static enum ld_plugin_status |
| 484 | add_symbols (void *handle, int nsyms, const struct ld_plugin_symbol *syms) |
| 485 | { |
| 486 | asymbol **symptrs; |
| 487 | plugin_input_file_t *input = handle; |
| 488 | bfd *abfd = input->abfd; |
| 489 | int n; |
| 490 | |
| 491 | ASSERT (called_plugin); |
| 492 | symptrs = xmalloc (nsyms * sizeof *symptrs); |
| 493 | for (n = 0; n < nsyms; n++) |
| 494 | { |
| 495 | enum ld_plugin_status rv; |
| 496 | asymbol *bfdsym; |
| 497 | |
| 498 | bfdsym = bfd_make_empty_symbol (abfd); |
| 499 | symptrs[n] = bfdsym; |
| 500 | rv = asymbol_from_plugin_symbol (abfd, bfdsym, syms + n); |
| 501 | if (rv != LDPS_OK) |
| 502 | return rv; |
| 503 | } |
| 504 | bfd_set_symtab (abfd, symptrs, nsyms); |
| 505 | return LDPS_OK; |
| 506 | } |
| 507 | |
| 508 | /* Get the input file information with an open (possibly re-opened) |
| 509 | file descriptor. */ |
| 510 | static enum ld_plugin_status |
| 511 | get_input_file (const void *handle, struct ld_plugin_input_file *file) |
| 512 | { |
| 513 | const plugin_input_file_t *input = handle; |
| 514 | |
| 515 | ASSERT (called_plugin); |
| 516 | |
| 517 | file->name = input->name; |
| 518 | file->offset = input->offset; |
| 519 | file->filesize = input->filesize; |
| 520 | file->handle = (void *) handle; |
| 521 | |
| 522 | return LDPS_OK; |
| 523 | } |
| 524 | |
| 525 | /* Get view of the input file. */ |
| 526 | static enum ld_plugin_status |
| 527 | get_view (const void *handle, const void **viewp) |
| 528 | { |
| 529 | plugin_input_file_t *input = (plugin_input_file_t *) handle; |
| 530 | char *buffer; |
| 531 | size_t size = input->filesize; |
| 532 | off_t offset = input->offset; |
| 533 | #if HAVE_MMAP && HAVE_GETPAGESIZE |
| 534 | off_t bias; |
| 535 | #endif |
| 536 | |
| 537 | ASSERT (called_plugin); |
| 538 | |
| 539 | /* FIXME: einfo should support %lld. */ |
| 540 | if ((off_t) size != input->filesize) |
| 541 | einfo (_("%F%P: unsupported input file size: %s (%ld bytes)\n"), |
| 542 | input->name, (long) input->filesize); |
| 543 | |
| 544 | /* Check the cached view buffer. */ |
| 545 | if (input->view_buffer.addr != NULL |
| 546 | && input->view_buffer.filesize == size |
| 547 | && input->view_buffer.offset == offset) |
| 548 | { |
| 549 | *viewp = input->view_buffer.addr; |
| 550 | return LDPS_OK; |
| 551 | } |
| 552 | |
| 553 | input->view_buffer.filesize = size; |
| 554 | input->view_buffer.offset = offset; |
| 555 | |
| 556 | #if HAVE_MMAP |
| 557 | # if HAVE_GETPAGESIZE |
| 558 | bias = offset % plugin_pagesize; |
| 559 | offset -= bias; |
| 560 | size += bias; |
| 561 | # endif |
| 562 | buffer = mmap (NULL, size, PROT_READ, MAP_PRIVATE, input->fd, offset); |
| 563 | if (buffer != MAP_FAILED) |
| 564 | { |
| 565 | input->use_mmap = TRUE; |
| 566 | # if HAVE_GETPAGESIZE |
| 567 | buffer += bias; |
| 568 | # endif |
| 569 | } |
| 570 | else |
| 571 | #endif |
| 572 | { |
| 573 | char *p; |
| 574 | |
| 575 | input->use_mmap = FALSE; |
| 576 | |
| 577 | if (lseek (input->fd, offset, SEEK_SET) < 0) |
| 578 | return LDPS_ERR; |
| 579 | |
| 580 | buffer = bfd_alloc (input->abfd, size); |
| 581 | if (buffer == NULL) |
| 582 | return LDPS_ERR; |
| 583 | |
| 584 | p = buffer; |
| 585 | do |
| 586 | { |
| 587 | ssize_t got = read (input->fd, p, size); |
| 588 | if (got == 0) |
| 589 | break; |
| 590 | else if (got > 0) |
| 591 | { |
| 592 | p += got; |
| 593 | size -= got; |
| 594 | } |
| 595 | else if (errno != EINTR) |
| 596 | return LDPS_ERR; |
| 597 | } |
| 598 | while (size > 0); |
| 599 | } |
| 600 | |
| 601 | input->view_buffer.addr = buffer; |
| 602 | *viewp = buffer; |
| 603 | |
| 604 | return LDPS_OK; |
| 605 | } |
| 606 | |
| 607 | /* Release the input file. */ |
| 608 | static enum ld_plugin_status |
| 609 | release_input_file (const void *handle) |
| 610 | { |
| 611 | plugin_input_file_t *input = (plugin_input_file_t *) handle; |
| 612 | ASSERT (called_plugin); |
| 613 | if (input->fd != -1) |
| 614 | { |
| 615 | close (input->fd); |
| 616 | input->fd = -1; |
| 617 | } |
| 618 | return LDPS_OK; |
| 619 | } |
| 620 | |
| 621 | /* Return TRUE if a defined symbol might be reachable from outside the |
| 622 | universe of claimed objects. */ |
| 623 | static inline bfd_boolean |
| 624 | is_visible_from_outside (struct ld_plugin_symbol *lsym, |
| 625 | struct bfd_link_hash_entry *blhe) |
| 626 | { |
| 627 | if (bfd_link_relocatable (&link_info)) |
| 628 | return TRUE; |
| 629 | if (blhe->non_ir_ref_dynamic |
| 630 | || link_info.export_dynamic |
| 631 | || bfd_link_dll (&link_info)) |
| 632 | { |
| 633 | /* Check if symbol is hidden by version script. */ |
| 634 | if (bfd_hide_sym_by_version (link_info.version_info, |
| 635 | blhe->root.string)) |
| 636 | return FALSE; |
| 637 | /* Only ELF symbols really have visibility. */ |
| 638 | if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour) |
| 639 | { |
| 640 | struct elf_link_hash_entry *el = (struct elf_link_hash_entry *)blhe; |
| 641 | int vis = ELF_ST_VISIBILITY (el->other); |
| 642 | return vis == STV_DEFAULT || vis == STV_PROTECTED; |
| 643 | } |
| 644 | /* On non-ELF targets, we can safely make inferences by considering |
| 645 | what visibility the plugin would have liked to apply when it first |
| 646 | sent us the symbol. During ELF symbol processing, visibility only |
| 647 | ever becomes more restrictive, not less, when symbols are merged, |
| 648 | so this is a conservative estimate; it may give false positives, |
| 649 | declaring something visible from outside when it in fact would |
| 650 | not have been, but this will only lead to missed optimisation |
| 651 | opportunities during LTRANS at worst; it will not give false |
| 652 | negatives, which can lead to the disastrous conclusion that the |
| 653 | related symbol is IRONLY. (See GCC PR46319 for an example.) */ |
| 654 | return (lsym->visibility == LDPV_DEFAULT |
| 655 | || lsym->visibility == LDPV_PROTECTED); |
| 656 | } |
| 657 | |
| 658 | return FALSE; |
| 659 | } |
| 660 | |
| 661 | /* Return LTO kind string name that corresponds to IDX enum value. */ |
| 662 | static const char * |
| 663 | get_lto_kind (unsigned int idx) |
| 664 | { |
| 665 | static char buffer[64]; |
| 666 | const char *lto_kind_str[5] = |
| 667 | { |
| 668 | "DEF", |
| 669 | "WEAKDEF", |
| 670 | "UNDEF", |
| 671 | "WEAKUNDEF", |
| 672 | "COMMON" |
| 673 | }; |
| 674 | |
| 675 | if (idx < ARRAY_SIZE (lto_kind_str)) |
| 676 | return lto_kind_str [idx]; |
| 677 | |
| 678 | sprintf (buffer, _("unknown LTO kind value %x"), idx); |
| 679 | return buffer; |
| 680 | } |
| 681 | |
| 682 | /* Return LTO resolution string name that corresponds to IDX enum value. */ |
| 683 | static const char * |
| 684 | get_lto_resolution (unsigned int idx) |
| 685 | { |
| 686 | static char buffer[64]; |
| 687 | static const char *lto_resolution_str[10] = |
| 688 | { |
| 689 | "UNKNOWN", |
| 690 | "UNDEF", |
| 691 | "PREVAILING_DEF", |
| 692 | "PREVAILING_DEF_IRONLY", |
| 693 | "PREEMPTED_REG", |
| 694 | "PREEMPTED_IR", |
| 695 | "RESOLVED_IR", |
| 696 | "RESOLVED_EXEC", |
| 697 | "RESOLVED_DYN", |
| 698 | "PREVAILING_DEF_IRONLY_EXP", |
| 699 | }; |
| 700 | |
| 701 | if (idx < ARRAY_SIZE (lto_resolution_str)) |
| 702 | return lto_resolution_str [idx]; |
| 703 | |
| 704 | sprintf (buffer, _("unknown LTO resolution value %x"), idx); |
| 705 | return buffer; |
| 706 | } |
| 707 | |
| 708 | /* Return LTO visibility string name that corresponds to IDX enum value. */ |
| 709 | static const char * |
| 710 | get_lto_visibility (unsigned int idx) |
| 711 | { |
| 712 | static char buffer[64]; |
| 713 | const char *lto_visibility_str[4] = |
| 714 | { |
| 715 | "DEFAULT", |
| 716 | "PROTECTED", |
| 717 | "INTERNAL", |
| 718 | "HIDDEN" |
| 719 | }; |
| 720 | |
| 721 | if (idx < ARRAY_SIZE (lto_visibility_str)) |
| 722 | return lto_visibility_str [idx]; |
| 723 | |
| 724 | sprintf (buffer, _("unknown LTO visibility value %x"), idx); |
| 725 | return buffer; |
| 726 | } |
| 727 | |
| 728 | /* Get the symbol resolution info for a plugin-claimed input file. */ |
| 729 | static enum ld_plugin_status |
| 730 | get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms, |
| 731 | int def_ironly_exp) |
| 732 | { |
| 733 | const plugin_input_file_t *input = handle; |
| 734 | const bfd *abfd = (const bfd *) input->abfd; |
| 735 | int n; |
| 736 | |
| 737 | ASSERT (called_plugin); |
| 738 | for (n = 0; n < nsyms; n++) |
| 739 | { |
| 740 | struct bfd_link_hash_entry *blhe; |
| 741 | asection *owner_sec; |
| 742 | int res; |
| 743 | struct bfd_link_hash_entry *h |
| 744 | = bfd_link_hash_lookup (link_info.hash, syms[n].name, |
| 745 | FALSE, FALSE, TRUE); |
| 746 | enum { wrap_none, wrapper, wrapped } wrap_status = wrap_none; |
| 747 | |
| 748 | if (syms[n].def != LDPK_UNDEF && syms[n].def != LDPK_WEAKUNDEF) |
| 749 | { |
| 750 | blhe = h; |
| 751 | if (blhe && link_info.wrap_hash != NULL) |
| 752 | { |
| 753 | /* Check if a symbol is a wrapper symbol. */ |
| 754 | struct bfd_link_hash_entry *unwrap |
| 755 | = unwrap_hash_lookup (&link_info, (bfd *) abfd, blhe); |
| 756 | if (unwrap && unwrap != h) |
| 757 | wrap_status = wrapper; |
| 758 | } |
| 759 | } |
| 760 | else |
| 761 | { |
| 762 | blhe = bfd_wrapped_link_hash_lookup (link_info.output_bfd, |
| 763 | &link_info, syms[n].name, |
| 764 | FALSE, FALSE, TRUE); |
| 765 | /* Check if a symbol is a wrapped symbol. */ |
| 766 | if (blhe && blhe != h) |
| 767 | wrap_status = wrapped; |
| 768 | } |
| 769 | if (!blhe) |
| 770 | { |
| 771 | /* The plugin is called to claim symbols in an archive element |
| 772 | from plugin_object_p. But those symbols aren't needed to |
| 773 | create output. They are defined and referenced only within |
| 774 | IR. */ |
| 775 | switch (syms[n].def) |
| 776 | { |
| 777 | default: |
| 778 | abort (); |
| 779 | case LDPK_UNDEF: |
| 780 | case LDPK_WEAKUNDEF: |
| 781 | res = LDPR_UNDEF; |
| 782 | break; |
| 783 | case LDPK_DEF: |
| 784 | case LDPK_WEAKDEF: |
| 785 | case LDPK_COMMON: |
| 786 | res = LDPR_PREVAILING_DEF_IRONLY; |
| 787 | break; |
| 788 | } |
| 789 | goto report_symbol; |
| 790 | } |
| 791 | |
| 792 | /* Determine resolution from blhe type and symbol's original type. */ |
| 793 | if (blhe->type == bfd_link_hash_undefined |
| 794 | || blhe->type == bfd_link_hash_undefweak) |
| 795 | { |
| 796 | res = LDPR_UNDEF; |
| 797 | goto report_symbol; |
| 798 | } |
| 799 | if (blhe->type != bfd_link_hash_defined |
| 800 | && blhe->type != bfd_link_hash_defweak |
| 801 | && blhe->type != bfd_link_hash_common) |
| 802 | { |
| 803 | /* We should not have a new, indirect or warning symbol here. */ |
| 804 | einfo (_("%F%P: %s: plugin symbol table corrupt (sym type %d)\n"), |
| 805 | called_plugin->name, blhe->type); |
| 806 | } |
| 807 | |
| 808 | /* Find out which section owns the symbol. Since it's not undef, |
| 809 | it must have an owner; if it's not a common symbol, both defs |
| 810 | and weakdefs keep it in the same place. */ |
| 811 | owner_sec = (blhe->type == bfd_link_hash_common |
| 812 | ? blhe->u.c.p->section |
| 813 | : blhe->u.def.section); |
| 814 | |
| 815 | |
| 816 | /* If it was originally undefined or common, then it has been |
| 817 | resolved; determine how. */ |
| 818 | if (syms[n].def == LDPK_UNDEF |
| 819 | || syms[n].def == LDPK_WEAKUNDEF |
| 820 | || syms[n].def == LDPK_COMMON) |
| 821 | { |
| 822 | if (owner_sec->owner == link_info.output_bfd) |
| 823 | res = LDPR_RESOLVED_EXEC; |
| 824 | else if (owner_sec->owner == abfd) |
| 825 | res = LDPR_PREVAILING_DEF_IRONLY; |
| 826 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
| 827 | res = LDPR_RESOLVED_IR; |
| 828 | else if (owner_sec->owner != NULL |
| 829 | && (owner_sec->owner->flags & DYNAMIC) != 0) |
| 830 | res = LDPR_RESOLVED_DYN; |
| 831 | else |
| 832 | res = LDPR_RESOLVED_EXEC; |
| 833 | } |
| 834 | |
| 835 | /* Was originally def, or weakdef. Does it prevail? If the |
| 836 | owner is the original dummy bfd that supplied it, then this |
| 837 | is the definition that has prevailed. */ |
| 838 | else if (owner_sec->owner == link_info.output_bfd) |
| 839 | res = LDPR_PREEMPTED_REG; |
| 840 | else if (owner_sec->owner == abfd) |
| 841 | res = LDPR_PREVAILING_DEF_IRONLY; |
| 842 | |
| 843 | /* Was originally def, weakdef, or common, but has been pre-empted. */ |
| 844 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
| 845 | res = LDPR_PREEMPTED_IR; |
| 846 | else |
| 847 | res = LDPR_PREEMPTED_REG; |
| 848 | |
| 849 | if (res == LDPR_PREVAILING_DEF_IRONLY) |
| 850 | { |
| 851 | /* We need to know if the sym is referenced from non-IR files. Or |
| 852 | even potentially-referenced, perhaps in a future final link if |
| 853 | this is a partial one, perhaps dynamically at load-time if the |
| 854 | symbol is externally visible. Also check for wrapper symbol. */ |
| 855 | if (blhe->non_ir_ref_regular || wrap_status == wrapper) |
| 856 | res = LDPR_PREVAILING_DEF; |
| 857 | else if (wrap_status == wrapped) |
| 858 | res = LDPR_RESOLVED_IR; |
| 859 | else if (is_visible_from_outside (&syms[n], blhe)) |
| 860 | res = def_ironly_exp; |
| 861 | } |
| 862 | |
| 863 | report_symbol: |
| 864 | syms[n].resolution = res; |
| 865 | if (report_plugin_symbols) |
| 866 | einfo (_("%P: %pB: symbol `%s' " |
| 867 | "definition: %s, visibility: %s, resolution: %s\n"), |
| 868 | abfd, syms[n].name, |
| 869 | get_lto_kind (syms[n].def), |
| 870 | get_lto_visibility (syms[n].visibility), |
| 871 | get_lto_resolution (res)); |
| 872 | } |
| 873 | return LDPS_OK; |
| 874 | } |
| 875 | |
| 876 | static enum ld_plugin_status |
| 877 | get_symbols_v1 (const void *handle, int nsyms, struct ld_plugin_symbol *syms) |
| 878 | { |
| 879 | return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF); |
| 880 | } |
| 881 | |
| 882 | static enum ld_plugin_status |
| 883 | get_symbols_v2 (const void *handle, int nsyms, struct ld_plugin_symbol *syms) |
| 884 | { |
| 885 | return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF_IRONLY_EXP); |
| 886 | } |
| 887 | |
| 888 | /* Add a new (real) input file generated by a plugin. */ |
| 889 | static enum ld_plugin_status |
| 890 | add_input_file (const char *pathname) |
| 891 | { |
| 892 | lang_input_statement_type *is; |
| 893 | |
| 894 | ASSERT (called_plugin); |
| 895 | is = lang_add_input_file (xstrdup (pathname), lang_input_file_is_file_enum, |
| 896 | NULL); |
| 897 | if (!is) |
| 898 | return LDPS_ERR; |
| 899 | is->flags.lto_output = 1; |
| 900 | return LDPS_OK; |
| 901 | } |
| 902 | |
| 903 | /* Add a new (real) library required by a plugin. */ |
| 904 | static enum ld_plugin_status |
| 905 | add_input_library (const char *pathname) |
| 906 | { |
| 907 | lang_input_statement_type *is; |
| 908 | |
| 909 | ASSERT (called_plugin); |
| 910 | is = lang_add_input_file (xstrdup (pathname), lang_input_file_is_l_enum, |
| 911 | NULL); |
| 912 | if (!is) |
| 913 | return LDPS_ERR; |
| 914 | is->flags.lto_output = 1; |
| 915 | return LDPS_OK; |
| 916 | } |
| 917 | |
| 918 | /* Set the extra library path to be used by libraries added via |
| 919 | add_input_library. */ |
| 920 | static enum ld_plugin_status |
| 921 | set_extra_library_path (const char *path) |
| 922 | { |
| 923 | ASSERT (called_plugin); |
| 924 | ldfile_add_library_path (xstrdup (path), FALSE); |
| 925 | return LDPS_OK; |
| 926 | } |
| 927 | |
| 928 | /* Issue a diagnostic message from a plugin. */ |
| 929 | static enum ld_plugin_status |
| 930 | message (int level, const char *format, ...) |
| 931 | { |
| 932 | va_list args; |
| 933 | va_start (args, format); |
| 934 | |
| 935 | switch (level) |
| 936 | { |
| 937 | case LDPL_INFO: |
| 938 | vfinfo (stdout, format, args, FALSE); |
| 939 | putchar ('\n'); |
| 940 | break; |
| 941 | case LDPL_WARNING: |
| 942 | { |
| 943 | char *newfmt = concat (_("%P: warning: "), format, "\n", |
| 944 | (const char *) NULL); |
| 945 | vfinfo (stdout, newfmt, args, TRUE); |
| 946 | free (newfmt); |
| 947 | } |
| 948 | break; |
| 949 | case LDPL_FATAL: |
| 950 | case LDPL_ERROR: |
| 951 | default: |
| 952 | { |
| 953 | char *newfmt = concat (level == LDPL_FATAL ? "%F" : "%X", |
| 954 | _("%P: error: "), format, "\n", |
| 955 | (const char *) NULL); |
| 956 | fflush (stdout); |
| 957 | vfinfo (stderr, newfmt, args, TRUE); |
| 958 | fflush (stderr); |
| 959 | free (newfmt); |
| 960 | } |
| 961 | break; |
| 962 | } |
| 963 | |
| 964 | va_end (args); |
| 965 | return LDPS_OK; |
| 966 | } |
| 967 | |
| 968 | /* Helper to size leading part of tv array and set it up. */ |
| 969 | static void |
| 970 | set_tv_header (struct ld_plugin_tv *tv) |
| 971 | { |
| 972 | size_t i; |
| 973 | |
| 974 | /* Version info. */ |
| 975 | static const unsigned int major = (unsigned)(BFD_VERSION / 100000000UL); |
| 976 | static const unsigned int minor = (unsigned)(BFD_VERSION / 1000000UL) % 100; |
| 977 | |
| 978 | for (i = 0; i < tv_header_size; i++) |
| 979 | { |
| 980 | tv[i].tv_tag = tv_header_tags[i]; |
| 981 | #define TVU(x) tv[i].tv_u.tv_ ## x |
| 982 | switch (tv[i].tv_tag) |
| 983 | { |
| 984 | case LDPT_MESSAGE: |
| 985 | TVU(message) = message; |
| 986 | break; |
| 987 | case LDPT_API_VERSION: |
| 988 | TVU(val) = LD_PLUGIN_API_VERSION; |
| 989 | break; |
| 990 | case LDPT_GNU_LD_VERSION: |
| 991 | TVU(val) = major * 100 + minor; |
| 992 | break; |
| 993 | case LDPT_LINKER_OUTPUT: |
| 994 | TVU(val) = (bfd_link_relocatable (&link_info) ? LDPO_REL |
| 995 | : bfd_link_pde (&link_info) ? LDPO_EXEC |
| 996 | : bfd_link_pie (&link_info) ? LDPO_PIE |
| 997 | : LDPO_DYN); |
| 998 | break; |
| 999 | case LDPT_OUTPUT_NAME: |
| 1000 | TVU(string) = output_filename; |
| 1001 | break; |
| 1002 | case LDPT_REGISTER_CLAIM_FILE_HOOK: |
| 1003 | TVU(register_claim_file) = register_claim_file; |
| 1004 | break; |
| 1005 | case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: |
| 1006 | TVU(register_all_symbols_read) = register_all_symbols_read; |
| 1007 | break; |
| 1008 | case LDPT_REGISTER_CLEANUP_HOOK: |
| 1009 | TVU(register_cleanup) = register_cleanup; |
| 1010 | break; |
| 1011 | case LDPT_ADD_SYMBOLS: |
| 1012 | TVU(add_symbols) = add_symbols; |
| 1013 | break; |
| 1014 | case LDPT_GET_INPUT_FILE: |
| 1015 | TVU(get_input_file) = get_input_file; |
| 1016 | break; |
| 1017 | case LDPT_GET_VIEW: |
| 1018 | TVU(get_view) = get_view; |
| 1019 | break; |
| 1020 | case LDPT_RELEASE_INPUT_FILE: |
| 1021 | TVU(release_input_file) = release_input_file; |
| 1022 | break; |
| 1023 | case LDPT_GET_SYMBOLS: |
| 1024 | TVU(get_symbols) = get_symbols_v1; |
| 1025 | break; |
| 1026 | case LDPT_GET_SYMBOLS_V2: |
| 1027 | TVU(get_symbols) = get_symbols_v2; |
| 1028 | break; |
| 1029 | case LDPT_ADD_INPUT_FILE: |
| 1030 | TVU(add_input_file) = add_input_file; |
| 1031 | break; |
| 1032 | case LDPT_ADD_INPUT_LIBRARY: |
| 1033 | TVU(add_input_library) = add_input_library; |
| 1034 | break; |
| 1035 | case LDPT_SET_EXTRA_LIBRARY_PATH: |
| 1036 | TVU(set_extra_library_path) = set_extra_library_path; |
| 1037 | break; |
| 1038 | default: |
| 1039 | /* Added a new entry to the array without adding |
| 1040 | a new case to set up its value is a bug. */ |
| 1041 | FAIL (); |
| 1042 | } |
| 1043 | #undef TVU |
| 1044 | } |
| 1045 | } |
| 1046 | |
| 1047 | /* Append the per-plugin args list and trailing LDPT_NULL to tv. */ |
| 1048 | static void |
| 1049 | set_tv_plugin_args (plugin_t *plugin, struct ld_plugin_tv *tv) |
| 1050 | { |
| 1051 | plugin_arg_t *arg = plugin->args; |
| 1052 | while (arg) |
| 1053 | { |
| 1054 | tv->tv_tag = LDPT_OPTION; |
| 1055 | tv->tv_u.tv_string = arg->arg; |
| 1056 | arg = arg->next; |
| 1057 | tv++; |
| 1058 | } |
| 1059 | tv->tv_tag = LDPT_NULL; |
| 1060 | tv->tv_u.tv_val = 0; |
| 1061 | } |
| 1062 | |
| 1063 | /* Load up and initialise all plugins after argument parsing. */ |
| 1064 | void |
| 1065 | plugin_load_plugins (void) |
| 1066 | { |
| 1067 | struct ld_plugin_tv *my_tv; |
| 1068 | unsigned int max_args = 0; |
| 1069 | plugin_t *curplug = plugins_list; |
| 1070 | |
| 1071 | /* If there are no plugins, we need do nothing this run. */ |
| 1072 | if (!curplug) |
| 1073 | return; |
| 1074 | |
| 1075 | /* First pass over plugins to find max # args needed so that we |
| 1076 | can size and allocate the tv array. */ |
| 1077 | while (curplug) |
| 1078 | { |
| 1079 | if (curplug->n_args > max_args) |
| 1080 | max_args = curplug->n_args; |
| 1081 | curplug = curplug->next; |
| 1082 | } |
| 1083 | |
| 1084 | /* Allocate tv array and initialise constant part. */ |
| 1085 | my_tv = xmalloc ((max_args + 1 + tv_header_size) * sizeof *my_tv); |
| 1086 | set_tv_header (my_tv); |
| 1087 | |
| 1088 | /* Pass over plugins again, activating them. */ |
| 1089 | curplug = plugins_list; |
| 1090 | while (curplug) |
| 1091 | { |
| 1092 | enum ld_plugin_status rv; |
| 1093 | ld_plugin_onload onloadfn; |
| 1094 | |
| 1095 | onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "onload"); |
| 1096 | if (!onloadfn) |
| 1097 | onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "_onload"); |
| 1098 | if (!onloadfn) |
| 1099 | einfo (_("%F%P: %s: error loading plugin: %s\n"), |
| 1100 | curplug->name, dlerror ()); |
| 1101 | set_tv_plugin_args (curplug, &my_tv[tv_header_size]); |
| 1102 | called_plugin = curplug; |
| 1103 | rv = (*onloadfn) (my_tv); |
| 1104 | called_plugin = NULL; |
| 1105 | if (rv != LDPS_OK) |
| 1106 | einfo (_("%F%P: %s: plugin error: %d\n"), curplug->name, rv); |
| 1107 | curplug = curplug->next; |
| 1108 | } |
| 1109 | |
| 1110 | /* Since plugin(s) inited ok, assume they're going to want symbol |
| 1111 | resolutions, which needs us to track which symbols are referenced |
| 1112 | by non-IR files using the linker's notice callback. */ |
| 1113 | orig_notice_all = link_info.notice_all; |
| 1114 | orig_callbacks = link_info.callbacks; |
| 1115 | plugin_callbacks = *orig_callbacks; |
| 1116 | plugin_callbacks.notice = &plugin_notice; |
| 1117 | link_info.notice_all = TRUE; |
| 1118 | link_info.lto_plugin_active = TRUE; |
| 1119 | link_info.callbacks = &plugin_callbacks; |
| 1120 | |
| 1121 | register_ld_plugin_object_p (plugin_object_p); |
| 1122 | |
| 1123 | #if HAVE_MMAP && HAVE_GETPAGESIZE |
| 1124 | plugin_pagesize = getpagesize (); |
| 1125 | #endif |
| 1126 | } |
| 1127 | |
| 1128 | /* Call 'claim file' hook for all plugins. */ |
| 1129 | static int |
| 1130 | plugin_call_claim_file (const struct ld_plugin_input_file *file, int *claimed) |
| 1131 | { |
| 1132 | plugin_t *curplug = plugins_list; |
| 1133 | *claimed = FALSE; |
| 1134 | while (curplug && !*claimed) |
| 1135 | { |
| 1136 | if (curplug->claim_file_handler) |
| 1137 | { |
| 1138 | enum ld_plugin_status rv; |
| 1139 | |
| 1140 | called_plugin = curplug; |
| 1141 | rv = (*curplug->claim_file_handler) (file, claimed); |
| 1142 | called_plugin = NULL; |
| 1143 | if (rv != LDPS_OK) |
| 1144 | set_plugin_error (curplug->name); |
| 1145 | } |
| 1146 | curplug = curplug->next; |
| 1147 | } |
| 1148 | return plugin_error_p () ? -1 : 0; |
| 1149 | } |
| 1150 | |
| 1151 | /* Duplicates a character string with memory attached to ABFD. */ |
| 1152 | |
| 1153 | static char * |
| 1154 | plugin_strdup (bfd *abfd, const char *str) |
| 1155 | { |
| 1156 | size_t strlength; |
| 1157 | char *copy; |
| 1158 | strlength = strlen (str) + 1; |
| 1159 | copy = bfd_alloc (abfd, strlength); |
| 1160 | if (copy == NULL) |
| 1161 | einfo (_("%F%P: plugin_strdup failed to allocate memory: %s\n"), |
| 1162 | bfd_get_error ()); |
| 1163 | memcpy (copy, str, strlength); |
| 1164 | return copy; |
| 1165 | } |
| 1166 | |
| 1167 | static const bfd_target * |
| 1168 | plugin_object_p (bfd *ibfd) |
| 1169 | { |
| 1170 | int claimed; |
| 1171 | plugin_input_file_t *input; |
| 1172 | struct ld_plugin_input_file file; |
| 1173 | bfd *abfd; |
| 1174 | |
| 1175 | /* Don't try the dummy object file. */ |
| 1176 | if ((ibfd->flags & BFD_PLUGIN) != 0) |
| 1177 | return NULL; |
| 1178 | |
| 1179 | if (ibfd->plugin_format != bfd_plugin_unknown) |
| 1180 | { |
| 1181 | if (ibfd->plugin_format == bfd_plugin_yes) |
| 1182 | return ibfd->plugin_dummy_bfd->xvec; |
| 1183 | else |
| 1184 | return NULL; |
| 1185 | } |
| 1186 | |
| 1187 | /* We create a dummy BFD, initially empty, to house whatever symbols |
| 1188 | the plugin may want to add. */ |
| 1189 | abfd = plugin_get_ir_dummy_bfd (ibfd->filename, ibfd); |
| 1190 | |
| 1191 | input = bfd_alloc (abfd, sizeof (*input)); |
| 1192 | if (input == NULL) |
| 1193 | einfo (_("%F%P: plugin failed to allocate memory for input: %s\n"), |
| 1194 | bfd_get_error ()); |
| 1195 | |
| 1196 | if (!bfd_plugin_open_input (ibfd, &file)) |
| 1197 | return NULL; |
| 1198 | |
| 1199 | if (file.name == ibfd->filename) |
| 1200 | { |
| 1201 | /* We must copy filename attached to ibfd if it is not an archive |
| 1202 | member since it may be freed by bfd_close below. */ |
| 1203 | file.name = plugin_strdup (abfd, file.name); |
| 1204 | } |
| 1205 | |
| 1206 | file.handle = input; |
| 1207 | input->abfd = abfd; |
| 1208 | input->view_buffer.addr = NULL; |
| 1209 | input->view_buffer.filesize = 0; |
| 1210 | input->view_buffer.offset = 0; |
| 1211 | input->fd = file.fd; |
| 1212 | input->use_mmap = FALSE; |
| 1213 | input->offset = file.offset; |
| 1214 | input->filesize = file.filesize; |
| 1215 | input->name = plugin_strdup (abfd, ibfd->filename); |
| 1216 | |
| 1217 | claimed = 0; |
| 1218 | |
| 1219 | if (plugin_call_claim_file (&file, &claimed)) |
| 1220 | einfo (_("%F%P: %s: plugin reported error claiming file\n"), |
| 1221 | plugin_error_plugin ()); |
| 1222 | |
| 1223 | if (input->fd != -1 && !bfd_plugin_target_p (ibfd->xvec)) |
| 1224 | { |
| 1225 | /* FIXME: fd belongs to us, not the plugin. GCC plugin, which |
| 1226 | doesn't need fd after plugin_call_claim_file, doesn't use |
| 1227 | BFD plugin target vector. Since GCC plugin doesn't call |
| 1228 | release_input_file, we close it here. LLVM plugin, which |
| 1229 | needs fd after plugin_call_claim_file and calls |
| 1230 | release_input_file after it is done, uses BFD plugin target |
| 1231 | vector. This scheme doesn't work when a plugin needs fd and |
| 1232 | doesn't use BFD plugin target vector neither. */ |
| 1233 | close (input->fd); |
| 1234 | input->fd = -1; |
| 1235 | } |
| 1236 | |
| 1237 | if (claimed) |
| 1238 | { |
| 1239 | ibfd->plugin_format = bfd_plugin_yes; |
| 1240 | ibfd->plugin_dummy_bfd = abfd; |
| 1241 | bfd_make_readable (abfd); |
| 1242 | return abfd->xvec; |
| 1243 | } |
| 1244 | else |
| 1245 | { |
| 1246 | #if HAVE_MMAP |
| 1247 | if (input->use_mmap) |
| 1248 | { |
| 1249 | /* If plugin didn't claim the file, unmap the buffer. */ |
| 1250 | char *addr = input->view_buffer.addr; |
| 1251 | off_t size = input->view_buffer.filesize; |
| 1252 | # if HAVE_GETPAGESIZE |
| 1253 | off_t bias = input->view_buffer.offset % plugin_pagesize; |
| 1254 | size += bias; |
| 1255 | addr -= bias; |
| 1256 | # endif |
| 1257 | munmap (addr, size); |
| 1258 | } |
| 1259 | #endif |
| 1260 | |
| 1261 | /* If plugin didn't claim the file, we don't need the dummy bfd. |
| 1262 | Can't avoid speculatively creating it, alas. */ |
| 1263 | ibfd->plugin_format = bfd_plugin_no; |
| 1264 | bfd_close_all_done (abfd); |
| 1265 | return NULL; |
| 1266 | } |
| 1267 | } |
| 1268 | |
| 1269 | void |
| 1270 | plugin_maybe_claim (lang_input_statement_type *entry) |
| 1271 | { |
| 1272 | ASSERT (entry->header.type == lang_input_statement_enum); |
| 1273 | if (plugin_object_p (entry->the_bfd)) |
| 1274 | { |
| 1275 | bfd *abfd = entry->the_bfd->plugin_dummy_bfd; |
| 1276 | |
| 1277 | /* Discard the real file's BFD and substitute the dummy one. */ |
| 1278 | |
| 1279 | /* We can't call bfd_close on archives. BFD archive handling |
| 1280 | caches elements, and add_archive_element keeps pointers to |
| 1281 | the_bfd and the_bfd->filename in a lang_input_statement_type |
| 1282 | linker script statement. */ |
| 1283 | if (entry->the_bfd->my_archive == NULL) |
| 1284 | bfd_close (entry->the_bfd); |
| 1285 | entry->the_bfd = abfd; |
| 1286 | entry->flags.claimed = 1; |
| 1287 | } |
| 1288 | } |
| 1289 | |
| 1290 | /* Call 'all symbols read' hook for all plugins. */ |
| 1291 | int |
| 1292 | plugin_call_all_symbols_read (void) |
| 1293 | { |
| 1294 | plugin_t *curplug = plugins_list; |
| 1295 | |
| 1296 | /* Disable any further file-claiming. */ |
| 1297 | no_more_claiming = TRUE; |
| 1298 | |
| 1299 | while (curplug) |
| 1300 | { |
| 1301 | if (curplug->all_symbols_read_handler) |
| 1302 | { |
| 1303 | enum ld_plugin_status rv; |
| 1304 | called_plugin = curplug; |
| 1305 | rv = (*curplug->all_symbols_read_handler) (); |
| 1306 | called_plugin = NULL; |
| 1307 | if (rv != LDPS_OK) |
| 1308 | set_plugin_error (curplug->name); |
| 1309 | } |
| 1310 | curplug = curplug->next; |
| 1311 | } |
| 1312 | return plugin_error_p () ? -1 : 0; |
| 1313 | } |
| 1314 | |
| 1315 | /* Call 'cleanup' hook for all plugins at exit. */ |
| 1316 | void |
| 1317 | plugin_call_cleanup (void) |
| 1318 | { |
| 1319 | plugin_t *curplug = plugins_list; |
| 1320 | while (curplug) |
| 1321 | { |
| 1322 | if (curplug->cleanup_handler && !curplug->cleanup_done) |
| 1323 | { |
| 1324 | enum ld_plugin_status rv; |
| 1325 | curplug->cleanup_done = TRUE; |
| 1326 | called_plugin = curplug; |
| 1327 | rv = (*curplug->cleanup_handler) (); |
| 1328 | called_plugin = NULL; |
| 1329 | if (rv != LDPS_OK) |
| 1330 | info_msg (_("%P: %s: error in plugin cleanup: %d (ignored)\n"), |
| 1331 | curplug->name, rv); |
| 1332 | dlclose (curplug->dlhandle); |
| 1333 | } |
| 1334 | curplug = curplug->next; |
| 1335 | } |
| 1336 | } |
| 1337 | |
| 1338 | /* To determine which symbols should be resolved LDPR_PREVAILING_DEF |
| 1339 | and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as |
| 1340 | the linker adds them to the linker hash table. Mark those |
| 1341 | referenced from a non-IR file with non_ir_ref_regular or |
| 1342 | non_ir_ref_dynamic as appropriate. We have to notice_all symbols, |
| 1343 | because we won't necessarily know until later which ones will be |
| 1344 | contributed by IR files. */ |
| 1345 | static bfd_boolean |
| 1346 | plugin_notice (struct bfd_link_info *info, |
| 1347 | struct bfd_link_hash_entry *h, |
| 1348 | struct bfd_link_hash_entry *inh, |
| 1349 | bfd *abfd, |
| 1350 | asection *section, |
| 1351 | bfd_vma value, |
| 1352 | flagword flags) |
| 1353 | { |
| 1354 | struct bfd_link_hash_entry *orig_h = h; |
| 1355 | |
| 1356 | if (h != NULL) |
| 1357 | { |
| 1358 | bfd *sym_bfd; |
| 1359 | bfd_boolean ref = FALSE; |
| 1360 | |
| 1361 | if (h->type == bfd_link_hash_warning) |
| 1362 | h = h->u.i.link; |
| 1363 | |
| 1364 | /* Nothing to do here if this def/ref is from an IR dummy BFD. */ |
| 1365 | if (is_ir_dummy_bfd (abfd)) |
| 1366 | ; |
| 1367 | |
| 1368 | /* Making an indirect symbol counts as a reference unless this |
| 1369 | is a brand new symbol. */ |
| 1370 | else if (bfd_is_ind_section (section) |
| 1371 | || (flags & BSF_INDIRECT) != 0) |
| 1372 | { |
| 1373 | /* ??? Some of this is questionable. See comments in |
| 1374 | _bfd_generic_link_add_one_symbol for case IND. */ |
| 1375 | if (h->type != bfd_link_hash_new |
| 1376 | || inh->type == bfd_link_hash_new) |
| 1377 | { |
| 1378 | if ((abfd->flags & DYNAMIC) == 0) |
| 1379 | inh->non_ir_ref_regular = TRUE; |
| 1380 | else |
| 1381 | inh->non_ir_ref_dynamic = TRUE; |
| 1382 | } |
| 1383 | |
| 1384 | if (h->type != bfd_link_hash_new) |
| 1385 | ref = TRUE; |
| 1386 | } |
| 1387 | |
| 1388 | /* Nothing to do here for warning symbols. */ |
| 1389 | else if ((flags & BSF_WARNING) != 0) |
| 1390 | ; |
| 1391 | |
| 1392 | /* Nothing to do here for constructor symbols. */ |
| 1393 | else if ((flags & BSF_CONSTRUCTOR) != 0) |
| 1394 | ; |
| 1395 | |
| 1396 | /* If this is a ref, set non_ir_ref. */ |
| 1397 | else if (bfd_is_und_section (section)) |
| 1398 | { |
| 1399 | /* Replace the undefined dummy bfd with the real one. */ |
| 1400 | if ((h->type == bfd_link_hash_undefined |
| 1401 | || h->type == bfd_link_hash_undefweak) |
| 1402 | && (h->u.undef.abfd == NULL |
| 1403 | || (h->u.undef.abfd->flags & BFD_PLUGIN) != 0)) |
| 1404 | h->u.undef.abfd = abfd; |
| 1405 | ref = TRUE; |
| 1406 | } |
| 1407 | |
| 1408 | |
| 1409 | /* A common symbol should be merged with other commons or |
| 1410 | defs with the same name. In particular, a common ought |
| 1411 | to be overridden by a def in a -flto object. In that |
| 1412 | sense a common is also a ref. */ |
| 1413 | else if (bfd_is_com_section (section)) |
| 1414 | { |
| 1415 | if (h->type == bfd_link_hash_common |
| 1416 | && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner)) |
| 1417 | { |
| 1418 | h->type = bfd_link_hash_undefweak; |
| 1419 | h->u.undef.abfd = sym_bfd; |
| 1420 | } |
| 1421 | ref = TRUE; |
| 1422 | } |
| 1423 | |
| 1424 | /* Otherwise, it must be a new def. |
| 1425 | Ensure any symbol defined in an IR dummy BFD takes on a |
| 1426 | new value from a real BFD. Weak symbols are not normally |
| 1427 | overridden by a new weak definition, and strong symbols |
| 1428 | will normally cause multiple definition errors. Avoid |
| 1429 | this by making the symbol appear to be undefined. */ |
| 1430 | else if (((h->type == bfd_link_hash_defweak |
| 1431 | || h->type == bfd_link_hash_defined) |
| 1432 | && is_ir_dummy_bfd (sym_bfd = h->u.def.section->owner)) |
| 1433 | || (h->type == bfd_link_hash_common |
| 1434 | && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner))) |
| 1435 | { |
| 1436 | h->type = bfd_link_hash_undefweak; |
| 1437 | h->u.undef.abfd = sym_bfd; |
| 1438 | } |
| 1439 | |
| 1440 | if (ref) |
| 1441 | { |
| 1442 | if ((abfd->flags & DYNAMIC) == 0) |
| 1443 | h->non_ir_ref_regular = TRUE; |
| 1444 | else |
| 1445 | h->non_ir_ref_dynamic = TRUE; |
| 1446 | } |
| 1447 | } |
| 1448 | |
| 1449 | /* Continue with cref/nocrossref/trace-sym processing. */ |
| 1450 | if (orig_h == NULL |
| 1451 | || orig_notice_all |
| 1452 | || (info->notice_hash != NULL |
| 1453 | && bfd_hash_lookup (info->notice_hash, orig_h->root.string, |
| 1454 | FALSE, FALSE) != NULL)) |
| 1455 | return (*orig_callbacks->notice) (info, orig_h, inh, |
| 1456 | abfd, section, value, flags); |
| 1457 | return TRUE; |
| 1458 | } |