| 1 | // plugin.cc -- plugin manager for gold -*- C++ -*- |
| 2 | |
| 3 | // Copyright (C) 2008-2017 Free Software Foundation, Inc. |
| 4 | // Written by Cary Coutant <ccoutant@google.com>. |
| 5 | |
| 6 | // This file is part of gold. |
| 7 | |
| 8 | // This program is free software; you can redistribute it and/or modify |
| 9 | // it under the terms of the GNU General Public License as published by |
| 10 | // the Free Software Foundation; either version 3 of the License, or |
| 11 | // (at your option) any later version. |
| 12 | |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | // MA 02110-1301, USA. |
| 22 | |
| 23 | #include "gold.h" |
| 24 | |
| 25 | #include <cstdio> |
| 26 | #include <cstdarg> |
| 27 | #include <cstring> |
| 28 | #include <string> |
| 29 | #include <vector> |
| 30 | |
| 31 | #ifdef ENABLE_PLUGINS |
| 32 | #ifdef HAVE_DLFCN_H |
| 33 | #include <dlfcn.h> |
| 34 | #elif defined (HAVE_WINDOWS_H) |
| 35 | #include <windows.h> |
| 36 | #else |
| 37 | #error Unknown how to handle dynamic-load-libraries. |
| 38 | #endif |
| 39 | |
| 40 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
| 41 | |
| 42 | #define RTLD_NOW 0 /* Dummy value. */ |
| 43 | static void * |
| 44 | dlopen(const char *file, int mode ATTRIBUTE_UNUSED) |
| 45 | { |
| 46 | return LoadLibrary(file); |
| 47 | } |
| 48 | |
| 49 | static void * |
| 50 | dlsym(void *handle, const char *name) |
| 51 | { |
| 52 | return reinterpret_cast<void *>( |
| 53 | GetProcAddress(static_cast<HMODULE>(handle),name)); |
| 54 | } |
| 55 | |
| 56 | static const char * |
| 57 | dlerror(void) |
| 58 | { |
| 59 | return "unable to load dll"; |
| 60 | } |
| 61 | |
| 62 | #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */ |
| 63 | #endif /* ENABLE_PLUGINS */ |
| 64 | |
| 65 | #include "parameters.h" |
| 66 | #include "errors.h" |
| 67 | #include "fileread.h" |
| 68 | #include "layout.h" |
| 69 | #include "options.h" |
| 70 | #include "plugin.h" |
| 71 | #include "target.h" |
| 72 | #include "readsyms.h" |
| 73 | #include "symtab.h" |
| 74 | #include "descriptors.h" |
| 75 | #include "elfcpp.h" |
| 76 | |
| 77 | namespace gold |
| 78 | { |
| 79 | |
| 80 | #ifdef ENABLE_PLUGINS |
| 81 | |
| 82 | // The linker's exported interfaces. |
| 83 | |
| 84 | extern "C" |
| 85 | { |
| 86 | |
| 87 | static enum ld_plugin_status |
| 88 | register_claim_file(ld_plugin_claim_file_handler handler); |
| 89 | |
| 90 | static enum ld_plugin_status |
| 91 | register_all_symbols_read(ld_plugin_all_symbols_read_handler handler); |
| 92 | |
| 93 | static enum ld_plugin_status |
| 94 | register_cleanup(ld_plugin_cleanup_handler handler); |
| 95 | |
| 96 | static enum ld_plugin_status |
| 97 | add_symbols(void *handle, int nsyms, const struct ld_plugin_symbol *syms); |
| 98 | |
| 99 | static enum ld_plugin_status |
| 100 | get_input_file(const void *handle, struct ld_plugin_input_file *file); |
| 101 | |
| 102 | static enum ld_plugin_status |
| 103 | get_view(const void *handle, const void **viewp); |
| 104 | |
| 105 | static enum ld_plugin_status |
| 106 | release_input_file(const void *handle); |
| 107 | |
| 108 | static enum ld_plugin_status |
| 109 | get_symbols(const void *handle, int nsyms, struct ld_plugin_symbol *syms); |
| 110 | |
| 111 | static enum ld_plugin_status |
| 112 | get_symbols_v2(const void *handle, int nsyms, struct ld_plugin_symbol *syms); |
| 113 | |
| 114 | static enum ld_plugin_status |
| 115 | get_symbols_v3(const void *handle, int nsyms, struct ld_plugin_symbol *syms); |
| 116 | |
| 117 | static enum ld_plugin_status |
| 118 | add_input_file(const char *pathname); |
| 119 | |
| 120 | static enum ld_plugin_status |
| 121 | add_input_library(const char *pathname); |
| 122 | |
| 123 | static enum ld_plugin_status |
| 124 | set_extra_library_path(const char *path); |
| 125 | |
| 126 | static enum ld_plugin_status |
| 127 | message(int level, const char *format, ...); |
| 128 | |
| 129 | static enum ld_plugin_status |
| 130 | get_input_section_count(const void* handle, unsigned int* count); |
| 131 | |
| 132 | static enum ld_plugin_status |
| 133 | get_input_section_type(const struct ld_plugin_section section, |
| 134 | unsigned int* type); |
| 135 | |
| 136 | static enum ld_plugin_status |
| 137 | get_input_section_name(const struct ld_plugin_section section, |
| 138 | char** section_name_ptr); |
| 139 | |
| 140 | static enum ld_plugin_status |
| 141 | get_input_section_contents(const struct ld_plugin_section section, |
| 142 | const unsigned char** section_contents, |
| 143 | size_t* len); |
| 144 | |
| 145 | static enum ld_plugin_status |
| 146 | update_section_order(const struct ld_plugin_section *section_list, |
| 147 | unsigned int num_sections); |
| 148 | |
| 149 | static enum ld_plugin_status |
| 150 | allow_section_ordering(); |
| 151 | |
| 152 | static enum ld_plugin_status |
| 153 | allow_unique_segment_for_sections(); |
| 154 | |
| 155 | static enum ld_plugin_status |
| 156 | unique_segment_for_sections(const char* segment_name, |
| 157 | uint64_t flags, |
| 158 | uint64_t align, |
| 159 | const struct ld_plugin_section *section_list, |
| 160 | unsigned int num_sections); |
| 161 | |
| 162 | static enum ld_plugin_status |
| 163 | get_input_section_alignment(const struct ld_plugin_section section, |
| 164 | unsigned int* addralign); |
| 165 | |
| 166 | static enum ld_plugin_status |
| 167 | get_input_section_size(const struct ld_plugin_section section, |
| 168 | uint64_t* secsize); |
| 169 | |
| 170 | }; |
| 171 | |
| 172 | #endif // ENABLE_PLUGINS |
| 173 | |
| 174 | static Pluginobj* make_sized_plugin_object(Input_file* input_file, |
| 175 | off_t offset, off_t filesize); |
| 176 | |
| 177 | // Plugin methods. |
| 178 | |
| 179 | // Load one plugin library. |
| 180 | |
| 181 | void |
| 182 | Plugin::load() |
| 183 | { |
| 184 | #ifdef ENABLE_PLUGINS |
| 185 | // Load the plugin library. |
| 186 | // FIXME: Look for the library in standard locations. |
| 187 | this->handle_ = dlopen(this->filename_.c_str(), RTLD_NOW); |
| 188 | if (this->handle_ == NULL) |
| 189 | { |
| 190 | gold_error(_("%s: could not load plugin library: %s"), |
| 191 | this->filename_.c_str(), dlerror()); |
| 192 | return; |
| 193 | } |
| 194 | |
| 195 | // Find the plugin's onload entry point. |
| 196 | void* ptr = dlsym(this->handle_, "onload"); |
| 197 | if (ptr == NULL) |
| 198 | { |
| 199 | gold_error(_("%s: could not find onload entry point"), |
| 200 | this->filename_.c_str()); |
| 201 | return; |
| 202 | } |
| 203 | ld_plugin_onload onload; |
| 204 | gold_assert(sizeof(onload) == sizeof(ptr)); |
| 205 | memcpy(&onload, &ptr, sizeof(ptr)); |
| 206 | |
| 207 | // Get the linker's version number. |
| 208 | const char* ver = get_version_string(); |
| 209 | int major = 0; |
| 210 | int minor = 0; |
| 211 | sscanf(ver, "%d.%d", &major, &minor); |
| 212 | |
| 213 | // Allocate and populate a transfer vector. |
| 214 | const int tv_fixed_size = 29; |
| 215 | |
| 216 | int tv_size = this->args_.size() + tv_fixed_size; |
| 217 | ld_plugin_tv* tv = new ld_plugin_tv[tv_size]; |
| 218 | |
| 219 | // Put LDPT_MESSAGE at the front of the list so the plugin can use it |
| 220 | // while processing subsequent entries. |
| 221 | int i = 0; |
| 222 | tv[i].tv_tag = LDPT_MESSAGE; |
| 223 | tv[i].tv_u.tv_message = message; |
| 224 | |
| 225 | ++i; |
| 226 | tv[i].tv_tag = LDPT_API_VERSION; |
| 227 | tv[i].tv_u.tv_val = LD_PLUGIN_API_VERSION; |
| 228 | |
| 229 | ++i; |
| 230 | tv[i].tv_tag = LDPT_GOLD_VERSION; |
| 231 | tv[i].tv_u.tv_val = major * 100 + minor; |
| 232 | |
| 233 | ++i; |
| 234 | tv[i].tv_tag = LDPT_LINKER_OUTPUT; |
| 235 | if (parameters->options().relocatable()) |
| 236 | tv[i].tv_u.tv_val = LDPO_REL; |
| 237 | else if (parameters->options().shared()) |
| 238 | tv[i].tv_u.tv_val = LDPO_DYN; |
| 239 | else if (parameters->options().pie()) |
| 240 | tv[i].tv_u.tv_val = LDPO_PIE; |
| 241 | else |
| 242 | tv[i].tv_u.tv_val = LDPO_EXEC; |
| 243 | |
| 244 | ++i; |
| 245 | tv[i].tv_tag = LDPT_OUTPUT_NAME; |
| 246 | tv[i].tv_u.tv_string = parameters->options().output(); |
| 247 | |
| 248 | for (unsigned int j = 0; j < this->args_.size(); ++j) |
| 249 | { |
| 250 | ++i; |
| 251 | tv[i].tv_tag = LDPT_OPTION; |
| 252 | tv[i].tv_u.tv_string = this->args_[j].c_str(); |
| 253 | } |
| 254 | |
| 255 | ++i; |
| 256 | tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK; |
| 257 | tv[i].tv_u.tv_register_claim_file = register_claim_file; |
| 258 | |
| 259 | ++i; |
| 260 | tv[i].tv_tag = LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK; |
| 261 | tv[i].tv_u.tv_register_all_symbols_read = register_all_symbols_read; |
| 262 | |
| 263 | ++i; |
| 264 | tv[i].tv_tag = LDPT_REGISTER_CLEANUP_HOOK; |
| 265 | tv[i].tv_u.tv_register_cleanup = register_cleanup; |
| 266 | |
| 267 | ++i; |
| 268 | tv[i].tv_tag = LDPT_ADD_SYMBOLS; |
| 269 | tv[i].tv_u.tv_add_symbols = add_symbols; |
| 270 | |
| 271 | ++i; |
| 272 | tv[i].tv_tag = LDPT_GET_INPUT_FILE; |
| 273 | tv[i].tv_u.tv_get_input_file = get_input_file; |
| 274 | |
| 275 | ++i; |
| 276 | tv[i].tv_tag = LDPT_GET_VIEW; |
| 277 | tv[i].tv_u.tv_get_view = get_view; |
| 278 | |
| 279 | ++i; |
| 280 | tv[i].tv_tag = LDPT_RELEASE_INPUT_FILE; |
| 281 | tv[i].tv_u.tv_release_input_file = release_input_file; |
| 282 | |
| 283 | ++i; |
| 284 | tv[i].tv_tag = LDPT_GET_SYMBOLS; |
| 285 | tv[i].tv_u.tv_get_symbols = get_symbols; |
| 286 | |
| 287 | ++i; |
| 288 | tv[i].tv_tag = LDPT_GET_SYMBOLS_V2; |
| 289 | tv[i].tv_u.tv_get_symbols = get_symbols_v2; |
| 290 | |
| 291 | ++i; |
| 292 | tv[i].tv_tag = LDPT_GET_SYMBOLS_V3; |
| 293 | tv[i].tv_u.tv_get_symbols = get_symbols_v3; |
| 294 | |
| 295 | ++i; |
| 296 | tv[i].tv_tag = LDPT_ADD_INPUT_FILE; |
| 297 | tv[i].tv_u.tv_add_input_file = add_input_file; |
| 298 | |
| 299 | ++i; |
| 300 | tv[i].tv_tag = LDPT_ADD_INPUT_LIBRARY; |
| 301 | tv[i].tv_u.tv_add_input_library = add_input_library; |
| 302 | |
| 303 | ++i; |
| 304 | tv[i].tv_tag = LDPT_SET_EXTRA_LIBRARY_PATH; |
| 305 | tv[i].tv_u.tv_set_extra_library_path = set_extra_library_path; |
| 306 | |
| 307 | ++i; |
| 308 | tv[i].tv_tag = LDPT_GET_INPUT_SECTION_COUNT; |
| 309 | tv[i].tv_u.tv_get_input_section_count = get_input_section_count; |
| 310 | |
| 311 | ++i; |
| 312 | tv[i].tv_tag = LDPT_GET_INPUT_SECTION_TYPE; |
| 313 | tv[i].tv_u.tv_get_input_section_type = get_input_section_type; |
| 314 | |
| 315 | ++i; |
| 316 | tv[i].tv_tag = LDPT_GET_INPUT_SECTION_NAME; |
| 317 | tv[i].tv_u.tv_get_input_section_name = get_input_section_name; |
| 318 | |
| 319 | ++i; |
| 320 | tv[i].tv_tag = LDPT_GET_INPUT_SECTION_CONTENTS; |
| 321 | tv[i].tv_u.tv_get_input_section_contents = get_input_section_contents; |
| 322 | |
| 323 | ++i; |
| 324 | tv[i].tv_tag = LDPT_UPDATE_SECTION_ORDER; |
| 325 | tv[i].tv_u.tv_update_section_order = update_section_order; |
| 326 | |
| 327 | ++i; |
| 328 | tv[i].tv_tag = LDPT_ALLOW_SECTION_ORDERING; |
| 329 | tv[i].tv_u.tv_allow_section_ordering = allow_section_ordering; |
| 330 | |
| 331 | ++i; |
| 332 | tv[i].tv_tag = LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS; |
| 333 | tv[i].tv_u.tv_allow_unique_segment_for_sections |
| 334 | = allow_unique_segment_for_sections; |
| 335 | |
| 336 | ++i; |
| 337 | tv[i].tv_tag = LDPT_UNIQUE_SEGMENT_FOR_SECTIONS; |
| 338 | tv[i].tv_u.tv_unique_segment_for_sections = unique_segment_for_sections; |
| 339 | |
| 340 | ++i; |
| 341 | tv[i].tv_tag = LDPT_GET_INPUT_SECTION_ALIGNMENT; |
| 342 | tv[i].tv_u.tv_get_input_section_alignment = get_input_section_alignment; |
| 343 | |
| 344 | ++i; |
| 345 | tv[i].tv_tag = LDPT_GET_INPUT_SECTION_SIZE; |
| 346 | tv[i].tv_u.tv_get_input_section_size = get_input_section_size; |
| 347 | |
| 348 | ++i; |
| 349 | tv[i].tv_tag = LDPT_NULL; |
| 350 | tv[i].tv_u.tv_val = 0; |
| 351 | |
| 352 | gold_assert(i == tv_size - 1); |
| 353 | |
| 354 | // Call the onload entry point. |
| 355 | (*onload)(tv); |
| 356 | |
| 357 | delete[] tv; |
| 358 | #endif // ENABLE_PLUGINS |
| 359 | } |
| 360 | |
| 361 | // Call the plugin claim-file handler. |
| 362 | |
| 363 | inline bool |
| 364 | Plugin::claim_file(struct ld_plugin_input_file* plugin_input_file) |
| 365 | { |
| 366 | int claimed = 0; |
| 367 | |
| 368 | if (this->claim_file_handler_ != NULL) |
| 369 | { |
| 370 | (*this->claim_file_handler_)(plugin_input_file, &claimed); |
| 371 | if (claimed) |
| 372 | return true; |
| 373 | } |
| 374 | return false; |
| 375 | } |
| 376 | |
| 377 | // Call the all-symbols-read handler. |
| 378 | |
| 379 | inline void |
| 380 | Plugin::all_symbols_read() |
| 381 | { |
| 382 | if (this->all_symbols_read_handler_ != NULL) |
| 383 | (*this->all_symbols_read_handler_)(); |
| 384 | } |
| 385 | |
| 386 | // Call the cleanup handler. |
| 387 | |
| 388 | inline void |
| 389 | Plugin::cleanup() |
| 390 | { |
| 391 | if (this->cleanup_handler_ != NULL && !this->cleanup_done_) |
| 392 | { |
| 393 | // Set this flag before calling to prevent a recursive plunge |
| 394 | // in the event that a plugin's cleanup handler issues a |
| 395 | // fatal error. |
| 396 | this->cleanup_done_ = true; |
| 397 | (*this->cleanup_handler_)(); |
| 398 | } |
| 399 | } |
| 400 | |
| 401 | // This task is used to rescan archives as needed. |
| 402 | |
| 403 | class Plugin_rescan : public Task |
| 404 | { |
| 405 | public: |
| 406 | Plugin_rescan(Task_token* this_blocker, Task_token* next_blocker) |
| 407 | : this_blocker_(this_blocker), next_blocker_(next_blocker) |
| 408 | { } |
| 409 | |
| 410 | ~Plugin_rescan() |
| 411 | { |
| 412 | delete this->this_blocker_; |
| 413 | } |
| 414 | |
| 415 | Task_token* |
| 416 | is_runnable() |
| 417 | { |
| 418 | if (this->this_blocker_->is_blocked()) |
| 419 | return this->this_blocker_; |
| 420 | return NULL; |
| 421 | } |
| 422 | |
| 423 | void |
| 424 | locks(Task_locker* tl) |
| 425 | { tl->add(this, this->next_blocker_); } |
| 426 | |
| 427 | void |
| 428 | run(Workqueue*) |
| 429 | { parameters->options().plugins()->rescan(this); } |
| 430 | |
| 431 | std::string |
| 432 | get_name() const |
| 433 | { return "Plugin_rescan"; } |
| 434 | |
| 435 | private: |
| 436 | Task_token* this_blocker_; |
| 437 | Task_token* next_blocker_; |
| 438 | }; |
| 439 | |
| 440 | // Plugin_manager methods. |
| 441 | |
| 442 | Plugin_manager::~Plugin_manager() |
| 443 | { |
| 444 | for (Plugin_list::iterator p = this->plugins_.begin(); |
| 445 | p != this->plugins_.end(); |
| 446 | ++p) |
| 447 | delete *p; |
| 448 | this->plugins_.clear(); |
| 449 | for (Object_list::iterator obj = this->objects_.begin(); |
| 450 | obj != this->objects_.end(); |
| 451 | ++obj) |
| 452 | delete *obj; |
| 453 | this->objects_.clear(); |
| 454 | delete this->lock_; |
| 455 | } |
| 456 | |
| 457 | // Load all plugin libraries. |
| 458 | |
| 459 | void |
| 460 | Plugin_manager::load_plugins(Layout* layout) |
| 461 | { |
| 462 | this->layout_ = layout; |
| 463 | for (this->current_ = this->plugins_.begin(); |
| 464 | this->current_ != this->plugins_.end(); |
| 465 | ++this->current_) |
| 466 | (*this->current_)->load(); |
| 467 | } |
| 468 | |
| 469 | // Call the plugin claim-file handlers in turn to see if any claim the file. |
| 470 | |
| 471 | Pluginobj* |
| 472 | Plugin_manager::claim_file(Input_file* input_file, off_t offset, |
| 473 | off_t filesize, Object* elf_object) |
| 474 | { |
| 475 | bool lock_initialized = this->initialize_lock_.initialize(); |
| 476 | |
| 477 | gold_assert(lock_initialized); |
| 478 | Hold_lock hl(*this->lock_); |
| 479 | if (this->in_replacement_phase_) |
| 480 | return NULL; |
| 481 | |
| 482 | unsigned int handle = this->objects_.size(); |
| 483 | this->input_file_ = input_file; |
| 484 | this->plugin_input_file_.name = input_file->filename().c_str(); |
| 485 | this->plugin_input_file_.fd = input_file->file().descriptor(); |
| 486 | this->plugin_input_file_.offset = offset; |
| 487 | this->plugin_input_file_.filesize = filesize; |
| 488 | this->plugin_input_file_.handle = reinterpret_cast<void*>(handle); |
| 489 | if (elf_object != NULL) |
| 490 | this->objects_.push_back(elf_object); |
| 491 | this->in_claim_file_handler_ = true; |
| 492 | |
| 493 | for (this->current_ = this->plugins_.begin(); |
| 494 | this->current_ != this->plugins_.end(); |
| 495 | ++this->current_) |
| 496 | { |
| 497 | if ((*this->current_)->claim_file(&this->plugin_input_file_)) |
| 498 | { |
| 499 | this->any_claimed_ = true; |
| 500 | this->in_claim_file_handler_ = false; |
| 501 | |
| 502 | if (this->objects_.size() > handle |
| 503 | && this->objects_[handle]->pluginobj() != NULL) |
| 504 | return this->objects_[handle]->pluginobj(); |
| 505 | |
| 506 | // If the plugin claimed the file but did not call the |
| 507 | // add_symbols callback, we need to create the Pluginobj now. |
| 508 | Pluginobj* obj = this->make_plugin_object(handle); |
| 509 | return obj; |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | this->in_claim_file_handler_ = false; |
| 514 | return NULL; |
| 515 | } |
| 516 | |
| 517 | // Save an archive. This is used so that a plugin can add a file |
| 518 | // which refers to a symbol which was not previously referenced. In |
| 519 | // that case we want to pretend that the symbol was referenced before, |
| 520 | // and pull in the archive object. |
| 521 | |
| 522 | void |
| 523 | Plugin_manager::save_archive(Archive* archive) |
| 524 | { |
| 525 | if (this->in_replacement_phase_ || !this->any_claimed_) |
| 526 | delete archive; |
| 527 | else |
| 528 | this->rescannable_.push_back(Rescannable(archive)); |
| 529 | } |
| 530 | |
| 531 | // Save an Input_group. This is like save_archive. |
| 532 | |
| 533 | void |
| 534 | Plugin_manager::save_input_group(Input_group* input_group) |
| 535 | { |
| 536 | if (this->in_replacement_phase_ || !this->any_claimed_) |
| 537 | delete input_group; |
| 538 | else |
| 539 | this->rescannable_.push_back(Rescannable(input_group)); |
| 540 | } |
| 541 | |
| 542 | // Call the all-symbols-read handlers. |
| 543 | |
| 544 | void |
| 545 | Plugin_manager::all_symbols_read(Workqueue* workqueue, Task* task, |
| 546 | Input_objects* input_objects, |
| 547 | Symbol_table* symtab, |
| 548 | Dirsearch* dirpath, Mapfile* mapfile, |
| 549 | Task_token** last_blocker) |
| 550 | { |
| 551 | this->in_replacement_phase_ = true; |
| 552 | this->workqueue_ = workqueue; |
| 553 | this->task_ = task; |
| 554 | this->input_objects_ = input_objects; |
| 555 | this->symtab_ = symtab; |
| 556 | this->dirpath_ = dirpath; |
| 557 | this->mapfile_ = mapfile; |
| 558 | this->this_blocker_ = NULL; |
| 559 | |
| 560 | for (this->current_ = this->plugins_.begin(); |
| 561 | this->current_ != this->plugins_.end(); |
| 562 | ++this->current_) |
| 563 | (*this->current_)->all_symbols_read(); |
| 564 | |
| 565 | if (this->any_added_) |
| 566 | { |
| 567 | Task_token* next_blocker = new Task_token(true); |
| 568 | next_blocker->add_blocker(); |
| 569 | workqueue->queue(new Plugin_rescan(this->this_blocker_, next_blocker)); |
| 570 | this->this_blocker_ = next_blocker; |
| 571 | } |
| 572 | |
| 573 | *last_blocker = this->this_blocker_; |
| 574 | } |
| 575 | |
| 576 | // This is called when we see a new undefined symbol. If we are in |
| 577 | // the replacement phase, this means that we may need to rescan some |
| 578 | // archives we have previously seen. |
| 579 | |
| 580 | void |
| 581 | Plugin_manager::new_undefined_symbol(Symbol* sym) |
| 582 | { |
| 583 | if (this->in_replacement_phase_) |
| 584 | this->undefined_symbols_.push_back(sym); |
| 585 | } |
| 586 | |
| 587 | // Rescan archives as needed. This handles the case where a new |
| 588 | // object file added by a plugin has an undefined reference to some |
| 589 | // symbol defined in an archive. |
| 590 | |
| 591 | void |
| 592 | Plugin_manager::rescan(Task* task) |
| 593 | { |
| 594 | size_t rescan_pos = 0; |
| 595 | size_t rescan_size = this->rescannable_.size(); |
| 596 | while (!this->undefined_symbols_.empty()) |
| 597 | { |
| 598 | if (rescan_pos >= rescan_size) |
| 599 | { |
| 600 | this->undefined_symbols_.clear(); |
| 601 | return; |
| 602 | } |
| 603 | |
| 604 | Undefined_symbol_list undefs; |
| 605 | undefs.reserve(this->undefined_symbols_.size()); |
| 606 | this->undefined_symbols_.swap(undefs); |
| 607 | |
| 608 | size_t min_rescan_pos = rescan_size; |
| 609 | |
| 610 | for (Undefined_symbol_list::const_iterator p = undefs.begin(); |
| 611 | p != undefs.end(); |
| 612 | ++p) |
| 613 | { |
| 614 | if (!(*p)->is_undefined()) |
| 615 | continue; |
| 616 | |
| 617 | this->undefined_symbols_.push_back(*p); |
| 618 | |
| 619 | // Find the first rescan archive which defines this symbol, |
| 620 | // starting at the current rescan position. The rescan position |
| 621 | // exists so that given -la -lb -lc we don't look for undefined |
| 622 | // symbols in -lb back in -la, but instead get the definition |
| 623 | // from -lc. Don't bother to look past the current minimum |
| 624 | // rescan position. |
| 625 | for (size_t i = rescan_pos; i < min_rescan_pos; ++i) |
| 626 | { |
| 627 | if (this->rescannable_defines(i, *p)) |
| 628 | { |
| 629 | min_rescan_pos = i; |
| 630 | break; |
| 631 | } |
| 632 | } |
| 633 | } |
| 634 | |
| 635 | if (min_rescan_pos >= rescan_size) |
| 636 | { |
| 637 | // We didn't find any rescannable archives which define any |
| 638 | // undefined symbols. |
| 639 | return; |
| 640 | } |
| 641 | |
| 642 | const Rescannable& r(this->rescannable_[min_rescan_pos]); |
| 643 | if (r.is_archive) |
| 644 | { |
| 645 | Task_lock_obj<Archive> tl(task, r.u.archive); |
| 646 | r.u.archive->add_symbols(this->symtab_, this->layout_, |
| 647 | this->input_objects_, this->mapfile_); |
| 648 | } |
| 649 | else |
| 650 | { |
| 651 | size_t next_saw_undefined = this->symtab_->saw_undefined(); |
| 652 | size_t saw_undefined; |
| 653 | do |
| 654 | { |
| 655 | saw_undefined = next_saw_undefined; |
| 656 | |
| 657 | for (Input_group::const_iterator p = r.u.input_group->begin(); |
| 658 | p != r.u.input_group->end(); |
| 659 | ++p) |
| 660 | { |
| 661 | Task_lock_obj<Archive> tl(task, *p); |
| 662 | |
| 663 | (*p)->add_symbols(this->symtab_, this->layout_, |
| 664 | this->input_objects_, this->mapfile_); |
| 665 | } |
| 666 | |
| 667 | next_saw_undefined = this->symtab_->saw_undefined(); |
| 668 | } |
| 669 | while (saw_undefined != next_saw_undefined); |
| 670 | } |
| 671 | |
| 672 | for (size_t i = rescan_pos; i < min_rescan_pos + 1; ++i) |
| 673 | { |
| 674 | if (this->rescannable_[i].is_archive) |
| 675 | delete this->rescannable_[i].u.archive; |
| 676 | else |
| 677 | delete this->rescannable_[i].u.input_group; |
| 678 | } |
| 679 | |
| 680 | rescan_pos = min_rescan_pos + 1; |
| 681 | } |
| 682 | } |
| 683 | |
| 684 | // Return whether the rescannable at index I defines SYM. |
| 685 | |
| 686 | bool |
| 687 | Plugin_manager::rescannable_defines(size_t i, Symbol* sym) |
| 688 | { |
| 689 | const Rescannable& r(this->rescannable_[i]); |
| 690 | if (r.is_archive) |
| 691 | return r.u.archive->defines_symbol(sym); |
| 692 | else |
| 693 | { |
| 694 | for (Input_group::const_iterator p = r.u.input_group->begin(); |
| 695 | p != r.u.input_group->end(); |
| 696 | ++p) |
| 697 | { |
| 698 | if ((*p)->defines_symbol(sym)) |
| 699 | return true; |
| 700 | } |
| 701 | return false; |
| 702 | } |
| 703 | } |
| 704 | |
| 705 | // Layout deferred objects. |
| 706 | |
| 707 | void |
| 708 | Plugin_manager::layout_deferred_objects() |
| 709 | { |
| 710 | Deferred_layout_list::iterator obj; |
| 711 | |
| 712 | for (obj = this->deferred_layout_objects_.begin(); |
| 713 | obj != this->deferred_layout_objects_.end(); |
| 714 | ++obj) |
| 715 | { |
| 716 | // Lock the object so we can read from it. This is only called |
| 717 | // single-threaded from queue_middle_tasks, so it is OK to lock. |
| 718 | // Unfortunately we have no way to pass in a Task token. |
| 719 | const Task* dummy_task = reinterpret_cast<const Task*>(-1); |
| 720 | Task_lock_obj<Object> tl(dummy_task, *obj); |
| 721 | (*obj)->layout_deferred_sections(this->layout_); |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | // Call the cleanup handlers. |
| 726 | |
| 727 | void |
| 728 | Plugin_manager::cleanup() |
| 729 | { |
| 730 | if (this->any_added_) |
| 731 | { |
| 732 | // If any input files were added, close all the input files. |
| 733 | // This is because the plugin may want to remove them, and on |
| 734 | // Windows you are not allowed to remove an open file. |
| 735 | close_all_descriptors(); |
| 736 | } |
| 737 | |
| 738 | for (this->current_ = this->plugins_.begin(); |
| 739 | this->current_ != this->plugins_.end(); |
| 740 | ++this->current_) |
| 741 | (*this->current_)->cleanup(); |
| 742 | } |
| 743 | |
| 744 | // Make a new Pluginobj object. This is called when the plugin calls |
| 745 | // the add_symbols API. |
| 746 | |
| 747 | Pluginobj* |
| 748 | Plugin_manager::make_plugin_object(unsigned int handle) |
| 749 | { |
| 750 | // Make sure we aren't asked to make an object for the same handle twice. |
| 751 | if (this->objects_.size() != handle |
| 752 | && this->objects_[handle]->pluginobj() != NULL) |
| 753 | return NULL; |
| 754 | |
| 755 | Pluginobj* obj = make_sized_plugin_object(this->input_file_, |
| 756 | this->plugin_input_file_.offset, |
| 757 | this->plugin_input_file_.filesize); |
| 758 | |
| 759 | |
| 760 | // If the elf object for this file was pushed into the objects_ vector, delete |
| 761 | // it to make room for the Pluginobj as this file is claimed. |
| 762 | if (this->objects_.size() != handle) |
| 763 | this->objects_.pop_back(); |
| 764 | |
| 765 | this->objects_.push_back(obj); |
| 766 | return obj; |
| 767 | } |
| 768 | |
| 769 | // Get the input file information with an open (possibly re-opened) |
| 770 | // file descriptor. |
| 771 | |
| 772 | ld_plugin_status |
| 773 | Plugin_manager::get_input_file(unsigned int handle, |
| 774 | struct ld_plugin_input_file* file) |
| 775 | { |
| 776 | Pluginobj* obj = this->object(handle)->pluginobj(); |
| 777 | if (obj == NULL) |
| 778 | return LDPS_BAD_HANDLE; |
| 779 | |
| 780 | obj->lock(this->task_); |
| 781 | file->name = obj->filename().c_str(); |
| 782 | file->fd = obj->descriptor(); |
| 783 | file->offset = obj->offset(); |
| 784 | file->filesize = obj->filesize(); |
| 785 | file->handle = reinterpret_cast<void*>(handle); |
| 786 | return LDPS_OK; |
| 787 | } |
| 788 | |
| 789 | // Release the input file. |
| 790 | |
| 791 | ld_plugin_status |
| 792 | Plugin_manager::release_input_file(unsigned int handle) |
| 793 | { |
| 794 | if (this->object(handle) == NULL) |
| 795 | return LDPS_BAD_HANDLE; |
| 796 | |
| 797 | Pluginobj* obj = this->object(handle)->pluginobj(); |
| 798 | |
| 799 | if (obj == NULL) |
| 800 | return LDPS_BAD_HANDLE; |
| 801 | |
| 802 | obj->unlock(this->task_); |
| 803 | return LDPS_OK; |
| 804 | } |
| 805 | |
| 806 | // Get the elf object corresponding to the handle. Return NULL if we |
| 807 | // found a Pluginobj instead. |
| 808 | |
| 809 | Object* |
| 810 | Plugin_manager::get_elf_object(const void* handle) |
| 811 | { |
| 812 | Object* obj = this->object( |
| 813 | static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle))); |
| 814 | |
| 815 | // The object should not be a Pluginobj. |
| 816 | if (obj == NULL |
| 817 | || obj->pluginobj() != NULL) |
| 818 | return NULL; |
| 819 | |
| 820 | return obj; |
| 821 | } |
| 822 | |
| 823 | ld_plugin_status |
| 824 | Plugin_manager::get_view(unsigned int handle, const void **viewp) |
| 825 | { |
| 826 | off_t offset; |
| 827 | size_t filesize; |
| 828 | Input_file *input_file; |
| 829 | if (this->in_claim_file_handler_) |
| 830 | { |
| 831 | // We are being called from the claim_file hook. |
| 832 | const struct ld_plugin_input_file &f = this->plugin_input_file_; |
| 833 | offset = f.offset; |
| 834 | filesize = f.filesize; |
| 835 | input_file = this->input_file_; |
| 836 | } |
| 837 | else |
| 838 | { |
| 839 | // An already claimed file. |
| 840 | if (this->object(handle) == NULL) |
| 841 | return LDPS_BAD_HANDLE; |
| 842 | Pluginobj* obj = this->object(handle)->pluginobj(); |
| 843 | if (obj == NULL) |
| 844 | return LDPS_BAD_HANDLE; |
| 845 | offset = obj->offset(); |
| 846 | filesize = obj->filesize(); |
| 847 | input_file = obj->input_file(); |
| 848 | } |
| 849 | *viewp = (void*) input_file->file().get_view(offset, 0, filesize, false, |
| 850 | false); |
| 851 | return LDPS_OK; |
| 852 | } |
| 853 | |
| 854 | // Add a new library path. |
| 855 | |
| 856 | ld_plugin_status |
| 857 | Plugin_manager::set_extra_library_path(const char* path) |
| 858 | { |
| 859 | this->extra_search_path_ = std::string(path); |
| 860 | return LDPS_OK; |
| 861 | } |
| 862 | |
| 863 | // Add a new input file. |
| 864 | |
| 865 | ld_plugin_status |
| 866 | Plugin_manager::add_input_file(const char* pathname, bool is_lib) |
| 867 | { |
| 868 | Input_file_argument file(pathname, |
| 869 | (is_lib |
| 870 | ? Input_file_argument::INPUT_FILE_TYPE_LIBRARY |
| 871 | : Input_file_argument::INPUT_FILE_TYPE_FILE), |
| 872 | (is_lib |
| 873 | ? this->extra_search_path_.c_str() |
| 874 | : ""), |
| 875 | false, |
| 876 | this->options_); |
| 877 | Input_argument* input_argument = new Input_argument(file); |
| 878 | Task_token* next_blocker = new Task_token(true); |
| 879 | next_blocker->add_blocker(); |
| 880 | if (parameters->incremental()) |
| 881 | gold_error(_("input files added by plug-ins in --incremental mode not " |
| 882 | "supported yet")); |
| 883 | this->workqueue_->queue_soon(new Read_symbols(this->input_objects_, |
| 884 | this->symtab_, |
| 885 | this->layout_, |
| 886 | this->dirpath_, |
| 887 | 0, |
| 888 | this->mapfile_, |
| 889 | input_argument, |
| 890 | NULL, |
| 891 | NULL, |
| 892 | this->this_blocker_, |
| 893 | next_blocker)); |
| 894 | this->this_blocker_ = next_blocker; |
| 895 | this->any_added_ = true; |
| 896 | return LDPS_OK; |
| 897 | } |
| 898 | |
| 899 | // Class Pluginobj. |
| 900 | |
| 901 | Pluginobj::Pluginobj(const std::string& name, Input_file* input_file, |
| 902 | off_t offset, off_t filesize) |
| 903 | : Object(name, input_file, false, offset), |
| 904 | nsyms_(0), syms_(NULL), symbols_(), filesize_(filesize), comdat_map_() |
| 905 | { |
| 906 | } |
| 907 | |
| 908 | // Return TRUE if a defined symbol is referenced from outside the |
| 909 | // universe of claimed objects. Only references from relocatable, |
| 910 | // non-IR (unclaimed) objects count as a reference. References from |
| 911 | // dynamic objects count only as "visible". |
| 912 | |
| 913 | static inline bool |
| 914 | is_referenced_from_outside(Symbol* lsym) |
| 915 | { |
| 916 | if (lsym->in_real_elf()) |
| 917 | return true; |
| 918 | if (parameters->options().relocatable()) |
| 919 | return true; |
| 920 | if (parameters->options().is_undefined(lsym->name())) |
| 921 | return true; |
| 922 | return false; |
| 923 | } |
| 924 | |
| 925 | // Return TRUE if a defined symbol might be reachable from outside the |
| 926 | // load module. |
| 927 | |
| 928 | static inline bool |
| 929 | is_visible_from_outside(Symbol* lsym) |
| 930 | { |
| 931 | if (lsym->in_dyn()) |
| 932 | return true; |
| 933 | if (parameters->options().export_dynamic() || parameters->options().shared() |
| 934 | || parameters->options().in_dynamic_list(lsym->name()) |
| 935 | || parameters->options().is_export_dynamic_symbol(lsym->name())) |
| 936 | return lsym->is_externally_visible(); |
| 937 | return false; |
| 938 | } |
| 939 | |
| 940 | // Get symbol resolution info. |
| 941 | |
| 942 | ld_plugin_status |
| 943 | Pluginobj::get_symbol_resolution_info(Symbol_table* symtab, |
| 944 | int nsyms, |
| 945 | ld_plugin_symbol* syms, |
| 946 | int version) const |
| 947 | { |
| 948 | // For version 1 of this interface, we cannot use |
| 949 | // LDPR_PREVAILING_DEF_IRONLY_EXP, so we return LDPR_PREVAILING_DEF |
| 950 | // instead. |
| 951 | const ld_plugin_symbol_resolution ldpr_prevailing_def_ironly_exp |
| 952 | = (version > 1 |
| 953 | ? LDPR_PREVAILING_DEF_IRONLY_EXP |
| 954 | : LDPR_PREVAILING_DEF); |
| 955 | |
| 956 | if (nsyms > this->nsyms_) |
| 957 | return LDPS_NO_SYMS; |
| 958 | |
| 959 | if (static_cast<size_t>(nsyms) > this->symbols_.size()) |
| 960 | { |
| 961 | // We never decided to include this object. We mark all symbols as |
| 962 | // preempted. |
| 963 | gold_assert(this->symbols_.size() == 0); |
| 964 | for (int i = 0; i < nsyms; i++) |
| 965 | syms[i].resolution = LDPR_PREEMPTED_REG; |
| 966 | return version > 2 ? LDPS_NO_SYMS : LDPS_OK; |
| 967 | } |
| 968 | |
| 969 | for (int i = 0; i < nsyms; i++) |
| 970 | { |
| 971 | ld_plugin_symbol* isym = &syms[i]; |
| 972 | Symbol* lsym = this->symbols_[i]; |
| 973 | if (lsym->is_forwarder()) |
| 974 | lsym = symtab->resolve_forwards(lsym); |
| 975 | ld_plugin_symbol_resolution res = LDPR_UNKNOWN; |
| 976 | |
| 977 | if (lsym->is_undefined()) |
| 978 | // The symbol remains undefined. |
| 979 | res = LDPR_UNDEF; |
| 980 | else if (isym->def == LDPK_UNDEF |
| 981 | || isym->def == LDPK_WEAKUNDEF |
| 982 | || isym->def == LDPK_COMMON) |
| 983 | { |
| 984 | // The original symbol was undefined or common. |
| 985 | if (lsym->source() != Symbol::FROM_OBJECT) |
| 986 | res = LDPR_RESOLVED_EXEC; |
| 987 | else if (lsym->object()->pluginobj() == this) |
| 988 | { |
| 989 | if (is_referenced_from_outside(lsym)) |
| 990 | res = LDPR_PREVAILING_DEF; |
| 991 | else if (is_visible_from_outside(lsym)) |
| 992 | res = ldpr_prevailing_def_ironly_exp; |
| 993 | else |
| 994 | res = LDPR_PREVAILING_DEF_IRONLY; |
| 995 | } |
| 996 | else if (lsym->object()->pluginobj() != NULL) |
| 997 | res = LDPR_RESOLVED_IR; |
| 998 | else if (lsym->object()->is_dynamic()) |
| 999 | res = LDPR_RESOLVED_DYN; |
| 1000 | else |
| 1001 | res = LDPR_RESOLVED_EXEC; |
| 1002 | } |
| 1003 | else |
| 1004 | { |
| 1005 | // The original symbol was a definition. |
| 1006 | if (lsym->source() != Symbol::FROM_OBJECT) |
| 1007 | res = LDPR_PREEMPTED_REG; |
| 1008 | else if (lsym->object() == static_cast<const Object*>(this)) |
| 1009 | { |
| 1010 | if (is_referenced_from_outside(lsym)) |
| 1011 | res = LDPR_PREVAILING_DEF; |
| 1012 | else if (is_visible_from_outside(lsym)) |
| 1013 | res = ldpr_prevailing_def_ironly_exp; |
| 1014 | else |
| 1015 | res = LDPR_PREVAILING_DEF_IRONLY; |
| 1016 | } |
| 1017 | else |
| 1018 | res = (lsym->object()->pluginobj() != NULL |
| 1019 | ? LDPR_PREEMPTED_IR |
| 1020 | : LDPR_PREEMPTED_REG); |
| 1021 | } |
| 1022 | isym->resolution = res; |
| 1023 | } |
| 1024 | return LDPS_OK; |
| 1025 | } |
| 1026 | |
| 1027 | // Return TRUE if the comdat group with key COMDAT_KEY from this object |
| 1028 | // should be kept. |
| 1029 | |
| 1030 | bool |
| 1031 | Pluginobj::include_comdat_group(std::string comdat_key, Layout* layout) |
| 1032 | { |
| 1033 | std::pair<Comdat_map::iterator, bool> ins = |
| 1034 | this->comdat_map_.insert(std::make_pair(comdat_key, false)); |
| 1035 | |
| 1036 | // If this is the first time we've seen this comdat key, ask the |
| 1037 | // layout object whether it should be included. |
| 1038 | if (ins.second) |
| 1039 | ins.first->second = layout->find_or_add_kept_section(comdat_key, |
| 1040 | NULL, 0, true, |
| 1041 | true, NULL); |
| 1042 | |
| 1043 | return ins.first->second; |
| 1044 | } |
| 1045 | |
| 1046 | // Class Sized_pluginobj. |
| 1047 | |
| 1048 | template<int size, bool big_endian> |
| 1049 | Sized_pluginobj<size, big_endian>::Sized_pluginobj( |
| 1050 | const std::string& name, |
| 1051 | Input_file* input_file, |
| 1052 | off_t offset, |
| 1053 | off_t filesize) |
| 1054 | : Pluginobj(name, input_file, offset, filesize) |
| 1055 | { |
| 1056 | } |
| 1057 | |
| 1058 | // Read the symbols. Not used for plugin objects. |
| 1059 | |
| 1060 | template<int size, bool big_endian> |
| 1061 | void |
| 1062 | Sized_pluginobj<size, big_endian>::do_read_symbols(Read_symbols_data*) |
| 1063 | { |
| 1064 | gold_unreachable(); |
| 1065 | } |
| 1066 | |
| 1067 | // Lay out the input sections. Not used for plugin objects. |
| 1068 | |
| 1069 | template<int size, bool big_endian> |
| 1070 | void |
| 1071 | Sized_pluginobj<size, big_endian>::do_layout(Symbol_table*, Layout*, |
| 1072 | Read_symbols_data*) |
| 1073 | { |
| 1074 | gold_unreachable(); |
| 1075 | } |
| 1076 | |
| 1077 | // Add the symbols to the symbol table. |
| 1078 | |
| 1079 | template<int size, bool big_endian> |
| 1080 | void |
| 1081 | Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab, |
| 1082 | Read_symbols_data*, |
| 1083 | Layout* layout) |
| 1084 | { |
| 1085 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 1086 | unsigned char symbuf[sym_size]; |
| 1087 | elfcpp::Sym<size, big_endian> sym(symbuf); |
| 1088 | elfcpp::Sym_write<size, big_endian> osym(symbuf); |
| 1089 | |
| 1090 | this->symbols_.resize(this->nsyms_); |
| 1091 | |
| 1092 | for (int i = 0; i < this->nsyms_; ++i) |
| 1093 | { |
| 1094 | const struct ld_plugin_symbol* isym = &this->syms_[i]; |
| 1095 | const char* name = isym->name; |
| 1096 | const char* ver = isym->version; |
| 1097 | elfcpp::Elf_Half shndx; |
| 1098 | elfcpp::STB bind; |
| 1099 | elfcpp::STV vis; |
| 1100 | |
| 1101 | if (name != NULL && name[0] == '\0') |
| 1102 | name = NULL; |
| 1103 | if (ver != NULL && ver[0] == '\0') |
| 1104 | ver = NULL; |
| 1105 | |
| 1106 | switch (isym->def) |
| 1107 | { |
| 1108 | case LDPK_WEAKDEF: |
| 1109 | case LDPK_WEAKUNDEF: |
| 1110 | bind = elfcpp::STB_WEAK; |
| 1111 | break; |
| 1112 | case LDPK_DEF: |
| 1113 | case LDPK_UNDEF: |
| 1114 | case LDPK_COMMON: |
| 1115 | default: |
| 1116 | bind = elfcpp::STB_GLOBAL; |
| 1117 | break; |
| 1118 | } |
| 1119 | |
| 1120 | switch (isym->def) |
| 1121 | { |
| 1122 | case LDPK_DEF: |
| 1123 | case LDPK_WEAKDEF: |
| 1124 | shndx = elfcpp::SHN_ABS; |
| 1125 | break; |
| 1126 | case LDPK_COMMON: |
| 1127 | shndx = elfcpp::SHN_COMMON; |
| 1128 | break; |
| 1129 | case LDPK_UNDEF: |
| 1130 | case LDPK_WEAKUNDEF: |
| 1131 | default: |
| 1132 | shndx = elfcpp::SHN_UNDEF; |
| 1133 | break; |
| 1134 | } |
| 1135 | |
| 1136 | switch (isym->visibility) |
| 1137 | { |
| 1138 | case LDPV_PROTECTED: |
| 1139 | vis = elfcpp::STV_PROTECTED; |
| 1140 | break; |
| 1141 | case LDPV_INTERNAL: |
| 1142 | vis = elfcpp::STV_INTERNAL; |
| 1143 | break; |
| 1144 | case LDPV_HIDDEN: |
| 1145 | vis = elfcpp::STV_HIDDEN; |
| 1146 | break; |
| 1147 | case LDPV_DEFAULT: |
| 1148 | default: |
| 1149 | vis = elfcpp::STV_DEFAULT; |
| 1150 | break; |
| 1151 | } |
| 1152 | |
| 1153 | if (isym->comdat_key != NULL |
| 1154 | && isym->comdat_key[0] != '\0' |
| 1155 | && !this->include_comdat_group(isym->comdat_key, layout)) |
| 1156 | shndx = elfcpp::SHN_UNDEF; |
| 1157 | |
| 1158 | osym.put_st_name(0); |
| 1159 | osym.put_st_value(0); |
| 1160 | osym.put_st_size(0); |
| 1161 | osym.put_st_info(bind, elfcpp::STT_NOTYPE); |
| 1162 | osym.put_st_other(vis, 0); |
| 1163 | osym.put_st_shndx(shndx); |
| 1164 | |
| 1165 | this->symbols_[i] = |
| 1166 | symtab->add_from_pluginobj<size, big_endian>(this, name, ver, &sym); |
| 1167 | } |
| 1168 | } |
| 1169 | |
| 1170 | template<int size, bool big_endian> |
| 1171 | Archive::Should_include |
| 1172 | Sized_pluginobj<size, big_endian>::do_should_include_member( |
| 1173 | Symbol_table* symtab, |
| 1174 | Layout* layout, |
| 1175 | Read_symbols_data*, |
| 1176 | std::string* why) |
| 1177 | { |
| 1178 | char* tmpbuf = NULL; |
| 1179 | size_t tmpbuflen = 0; |
| 1180 | |
| 1181 | for (int i = 0; i < this->nsyms_; ++i) |
| 1182 | { |
| 1183 | const struct ld_plugin_symbol& sym = this->syms_[i]; |
| 1184 | if (sym.def == LDPK_UNDEF || sym.def == LDPK_WEAKUNDEF) |
| 1185 | continue; |
| 1186 | const char* name = sym.name; |
| 1187 | Symbol* symbol; |
| 1188 | Archive::Should_include t = Archive::should_include_member(symtab, |
| 1189 | layout, |
| 1190 | name, |
| 1191 | &symbol, why, |
| 1192 | &tmpbuf, |
| 1193 | &tmpbuflen); |
| 1194 | if (t == Archive::SHOULD_INCLUDE_YES) |
| 1195 | { |
| 1196 | if (tmpbuf != NULL) |
| 1197 | free(tmpbuf); |
| 1198 | return t; |
| 1199 | } |
| 1200 | } |
| 1201 | if (tmpbuf != NULL) |
| 1202 | free(tmpbuf); |
| 1203 | return Archive::SHOULD_INCLUDE_UNKNOWN; |
| 1204 | } |
| 1205 | |
| 1206 | // Iterate over global symbols, calling a visitor class V for each. |
| 1207 | |
| 1208 | template<int size, bool big_endian> |
| 1209 | void |
| 1210 | Sized_pluginobj<size, big_endian>::do_for_all_global_symbols( |
| 1211 | Read_symbols_data*, |
| 1212 | Library_base::Symbol_visitor_base* v) |
| 1213 | { |
| 1214 | for (int i = 0; i < this->nsyms_; ++i) |
| 1215 | { |
| 1216 | const struct ld_plugin_symbol& sym = this->syms_[i]; |
| 1217 | if (sym.def != LDPK_UNDEF) |
| 1218 | v->visit(sym.name); |
| 1219 | } |
| 1220 | } |
| 1221 | |
| 1222 | // Iterate over local symbols, calling a visitor class V for each GOT offset |
| 1223 | // associated with a local symbol. |
| 1224 | template<int size, bool big_endian> |
| 1225 | void |
| 1226 | Sized_pluginobj<size, big_endian>::do_for_all_local_got_entries( |
| 1227 | Got_offset_list::Visitor*) const |
| 1228 | { |
| 1229 | gold_unreachable(); |
| 1230 | } |
| 1231 | |
| 1232 | // Get the size of a section. Not used for plugin objects. |
| 1233 | |
| 1234 | template<int size, bool big_endian> |
| 1235 | uint64_t |
| 1236 | Sized_pluginobj<size, big_endian>::do_section_size(unsigned int) |
| 1237 | { |
| 1238 | gold_unreachable(); |
| 1239 | return 0; |
| 1240 | } |
| 1241 | |
| 1242 | // Get the name of a section. Not used for plugin objects. |
| 1243 | |
| 1244 | template<int size, bool big_endian> |
| 1245 | std::string |
| 1246 | Sized_pluginobj<size, big_endian>::do_section_name(unsigned int) const |
| 1247 | { |
| 1248 | gold_unreachable(); |
| 1249 | return std::string(); |
| 1250 | } |
| 1251 | |
| 1252 | // Return a view of the contents of a section. Not used for plugin objects. |
| 1253 | |
| 1254 | template<int size, bool big_endian> |
| 1255 | const unsigned char* |
| 1256 | Sized_pluginobj<size, big_endian>::do_section_contents( |
| 1257 | unsigned int, |
| 1258 | section_size_type*, |
| 1259 | bool) |
| 1260 | { |
| 1261 | gold_unreachable(); |
| 1262 | return NULL; |
| 1263 | } |
| 1264 | |
| 1265 | // Return section flags. Not used for plugin objects. |
| 1266 | |
| 1267 | template<int size, bool big_endian> |
| 1268 | uint64_t |
| 1269 | Sized_pluginobj<size, big_endian>::do_section_flags(unsigned int) |
| 1270 | { |
| 1271 | gold_unreachable(); |
| 1272 | return 0; |
| 1273 | } |
| 1274 | |
| 1275 | // Return section entsize. Not used for plugin objects. |
| 1276 | |
| 1277 | template<int size, bool big_endian> |
| 1278 | uint64_t |
| 1279 | Sized_pluginobj<size, big_endian>::do_section_entsize(unsigned int) |
| 1280 | { |
| 1281 | gold_unreachable(); |
| 1282 | return 0; |
| 1283 | } |
| 1284 | |
| 1285 | // Return section address. Not used for plugin objects. |
| 1286 | |
| 1287 | template<int size, bool big_endian> |
| 1288 | uint64_t |
| 1289 | Sized_pluginobj<size, big_endian>::do_section_address(unsigned int) |
| 1290 | { |
| 1291 | gold_unreachable(); |
| 1292 | return 0; |
| 1293 | } |
| 1294 | |
| 1295 | // Return section type. Not used for plugin objects. |
| 1296 | |
| 1297 | template<int size, bool big_endian> |
| 1298 | unsigned int |
| 1299 | Sized_pluginobj<size, big_endian>::do_section_type(unsigned int) |
| 1300 | { |
| 1301 | gold_unreachable(); |
| 1302 | return 0; |
| 1303 | } |
| 1304 | |
| 1305 | // Return the section link field. Not used for plugin objects. |
| 1306 | |
| 1307 | template<int size, bool big_endian> |
| 1308 | unsigned int |
| 1309 | Sized_pluginobj<size, big_endian>::do_section_link(unsigned int) |
| 1310 | { |
| 1311 | gold_unreachable(); |
| 1312 | return 0; |
| 1313 | } |
| 1314 | |
| 1315 | // Return the section link field. Not used for plugin objects. |
| 1316 | |
| 1317 | template<int size, bool big_endian> |
| 1318 | unsigned int |
| 1319 | Sized_pluginobj<size, big_endian>::do_section_info(unsigned int) |
| 1320 | { |
| 1321 | gold_unreachable(); |
| 1322 | return 0; |
| 1323 | } |
| 1324 | |
| 1325 | // Return the section alignment. Not used for plugin objects. |
| 1326 | |
| 1327 | template<int size, bool big_endian> |
| 1328 | uint64_t |
| 1329 | Sized_pluginobj<size, big_endian>::do_section_addralign(unsigned int) |
| 1330 | { |
| 1331 | gold_unreachable(); |
| 1332 | return 0; |
| 1333 | } |
| 1334 | |
| 1335 | // Return the Xindex structure to use. Not used for plugin objects. |
| 1336 | |
| 1337 | template<int size, bool big_endian> |
| 1338 | Xindex* |
| 1339 | Sized_pluginobj<size, big_endian>::do_initialize_xindex() |
| 1340 | { |
| 1341 | gold_unreachable(); |
| 1342 | return NULL; |
| 1343 | } |
| 1344 | |
| 1345 | // Get symbol counts. Don't count plugin objects; the replacement |
| 1346 | // files will provide the counts. |
| 1347 | |
| 1348 | template<int size, bool big_endian> |
| 1349 | void |
| 1350 | Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts( |
| 1351 | const Symbol_table*, |
| 1352 | size_t* defined, |
| 1353 | size_t* used) const |
| 1354 | { |
| 1355 | *defined = 0; |
| 1356 | *used = 0; |
| 1357 | } |
| 1358 | |
| 1359 | // Get symbols. Not used for plugin objects. |
| 1360 | |
| 1361 | template<int size, bool big_endian> |
| 1362 | const Object::Symbols* |
| 1363 | Sized_pluginobj<size, big_endian>::do_get_global_symbols() const |
| 1364 | { |
| 1365 | gold_unreachable(); |
| 1366 | } |
| 1367 | |
| 1368 | // Class Plugin_finish. This task runs after all replacement files have |
| 1369 | // been added. For now, it's a placeholder for a possible plugin API |
| 1370 | // to allow the plugin to release most of its resources. The cleanup |
| 1371 | // handlers must be called later, because they can remove the temporary |
| 1372 | // object files that are needed until the end of the link. |
| 1373 | |
| 1374 | class Plugin_finish : public Task |
| 1375 | { |
| 1376 | public: |
| 1377 | Plugin_finish(Task_token* this_blocker, Task_token* next_blocker) |
| 1378 | : this_blocker_(this_blocker), next_blocker_(next_blocker) |
| 1379 | { } |
| 1380 | |
| 1381 | ~Plugin_finish() |
| 1382 | { |
| 1383 | if (this->this_blocker_ != NULL) |
| 1384 | delete this->this_blocker_; |
| 1385 | } |
| 1386 | |
| 1387 | Task_token* |
| 1388 | is_runnable() |
| 1389 | { |
| 1390 | if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) |
| 1391 | return this->this_blocker_; |
| 1392 | return NULL; |
| 1393 | } |
| 1394 | |
| 1395 | void |
| 1396 | locks(Task_locker* tl) |
| 1397 | { tl->add(this, this->next_blocker_); } |
| 1398 | |
| 1399 | void |
| 1400 | run(Workqueue*) |
| 1401 | { |
| 1402 | // We could call early cleanup handlers here. |
| 1403 | } |
| 1404 | |
| 1405 | std::string |
| 1406 | get_name() const |
| 1407 | { return "Plugin_finish"; } |
| 1408 | |
| 1409 | private: |
| 1410 | Task_token* this_blocker_; |
| 1411 | Task_token* next_blocker_; |
| 1412 | }; |
| 1413 | |
| 1414 | // Class Plugin_hook. |
| 1415 | |
| 1416 | Plugin_hook::~Plugin_hook() |
| 1417 | { |
| 1418 | } |
| 1419 | |
| 1420 | // Return whether a Plugin_hook task is runnable. |
| 1421 | |
| 1422 | Task_token* |
| 1423 | Plugin_hook::is_runnable() |
| 1424 | { |
| 1425 | if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) |
| 1426 | return this->this_blocker_; |
| 1427 | return NULL; |
| 1428 | } |
| 1429 | |
| 1430 | // Return a Task_locker for a Plugin_hook task. We don't need any |
| 1431 | // locks here. |
| 1432 | |
| 1433 | void |
| 1434 | Plugin_hook::locks(Task_locker*) |
| 1435 | { |
| 1436 | } |
| 1437 | |
| 1438 | // Run the "all symbols read" plugin hook. |
| 1439 | |
| 1440 | void |
| 1441 | Plugin_hook::run(Workqueue* workqueue) |
| 1442 | { |
| 1443 | gold_assert(this->options_.has_plugins()); |
| 1444 | Symbol* start_sym = this->symtab_->lookup(parameters->entry()); |
| 1445 | if (start_sym != NULL) |
| 1446 | start_sym->set_in_real_elf(); |
| 1447 | |
| 1448 | this->options_.plugins()->all_symbols_read(workqueue, |
| 1449 | this, |
| 1450 | this->input_objects_, |
| 1451 | this->symtab_, |
| 1452 | this->dirpath_, |
| 1453 | this->mapfile_, |
| 1454 | &this->this_blocker_); |
| 1455 | workqueue->queue_soon(new Plugin_finish(this->this_blocker_, |
| 1456 | this->next_blocker_)); |
| 1457 | } |
| 1458 | |
| 1459 | // The C interface routines called by the plugins. |
| 1460 | |
| 1461 | #ifdef ENABLE_PLUGINS |
| 1462 | |
| 1463 | // Register a claim-file handler. |
| 1464 | |
| 1465 | static enum ld_plugin_status |
| 1466 | register_claim_file(ld_plugin_claim_file_handler handler) |
| 1467 | { |
| 1468 | gold_assert(parameters->options().has_plugins()); |
| 1469 | parameters->options().plugins()->set_claim_file_handler(handler); |
| 1470 | return LDPS_OK; |
| 1471 | } |
| 1472 | |
| 1473 | // Register an all-symbols-read handler. |
| 1474 | |
| 1475 | static enum ld_plugin_status |
| 1476 | register_all_symbols_read(ld_plugin_all_symbols_read_handler handler) |
| 1477 | { |
| 1478 | gold_assert(parameters->options().has_plugins()); |
| 1479 | parameters->options().plugins()->set_all_symbols_read_handler(handler); |
| 1480 | return LDPS_OK; |
| 1481 | } |
| 1482 | |
| 1483 | // Register a cleanup handler. |
| 1484 | |
| 1485 | static enum ld_plugin_status |
| 1486 | register_cleanup(ld_plugin_cleanup_handler handler) |
| 1487 | { |
| 1488 | gold_assert(parameters->options().has_plugins()); |
| 1489 | parameters->options().plugins()->set_cleanup_handler(handler); |
| 1490 | return LDPS_OK; |
| 1491 | } |
| 1492 | |
| 1493 | // Add symbols from a plugin-claimed input file. |
| 1494 | |
| 1495 | static enum ld_plugin_status |
| 1496 | add_symbols(void* handle, int nsyms, const ld_plugin_symbol* syms) |
| 1497 | { |
| 1498 | gold_assert(parameters->options().has_plugins()); |
| 1499 | Pluginobj* obj = parameters->options().plugins()->make_plugin_object( |
| 1500 | static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle))); |
| 1501 | if (obj == NULL) |
| 1502 | return LDPS_ERR; |
| 1503 | obj->store_incoming_symbols(nsyms, syms); |
| 1504 | return LDPS_OK; |
| 1505 | } |
| 1506 | |
| 1507 | // Get the input file information with an open (possibly re-opened) |
| 1508 | // file descriptor. |
| 1509 | |
| 1510 | static enum ld_plugin_status |
| 1511 | get_input_file(const void* handle, struct ld_plugin_input_file* file) |
| 1512 | { |
| 1513 | gold_assert(parameters->options().has_plugins()); |
| 1514 | unsigned int obj_index = |
| 1515 | static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)); |
| 1516 | return parameters->options().plugins()->get_input_file(obj_index, file); |
| 1517 | } |
| 1518 | |
| 1519 | // Release the input file. |
| 1520 | |
| 1521 | static enum ld_plugin_status |
| 1522 | release_input_file(const void* handle) |
| 1523 | { |
| 1524 | gold_assert(parameters->options().has_plugins()); |
| 1525 | unsigned int obj_index = |
| 1526 | static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)); |
| 1527 | return parameters->options().plugins()->release_input_file(obj_index); |
| 1528 | } |
| 1529 | |
| 1530 | static enum ld_plugin_status |
| 1531 | get_view(const void *handle, const void **viewp) |
| 1532 | { |
| 1533 | gold_assert(parameters->options().has_plugins()); |
| 1534 | unsigned int obj_index = |
| 1535 | static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)); |
| 1536 | return parameters->options().plugins()->get_view(obj_index, viewp); |
| 1537 | } |
| 1538 | |
| 1539 | // Get the symbol resolution info for a plugin-claimed input file. |
| 1540 | |
| 1541 | static enum ld_plugin_status |
| 1542 | get_symbols(const void* handle, int nsyms, ld_plugin_symbol* syms) |
| 1543 | { |
| 1544 | gold_assert(parameters->options().has_plugins()); |
| 1545 | Plugin_manager* plugins = parameters->options().plugins(); |
| 1546 | Object* obj = plugins->object( |
| 1547 | static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle))); |
| 1548 | if (obj == NULL) |
| 1549 | return LDPS_ERR; |
| 1550 | Pluginobj* plugin_obj = obj->pluginobj(); |
| 1551 | if (plugin_obj == NULL) |
| 1552 | return LDPS_ERR; |
| 1553 | Symbol_table* symtab = plugins->symtab(); |
| 1554 | return plugin_obj->get_symbol_resolution_info(symtab, nsyms, syms, 1); |
| 1555 | } |
| 1556 | |
| 1557 | // Version 2 of the above. The only difference is that this version |
| 1558 | // is allowed to return the resolution code LDPR_PREVAILING_DEF_IRONLY_EXP. |
| 1559 | |
| 1560 | static enum ld_plugin_status |
| 1561 | get_symbols_v2(const void* handle, int nsyms, ld_plugin_symbol* syms) |
| 1562 | { |
| 1563 | gold_assert(parameters->options().has_plugins()); |
| 1564 | Plugin_manager* plugins = parameters->options().plugins(); |
| 1565 | Object* obj = plugins->object( |
| 1566 | static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle))); |
| 1567 | if (obj == NULL) |
| 1568 | return LDPS_ERR; |
| 1569 | Pluginobj* plugin_obj = obj->pluginobj(); |
| 1570 | if (plugin_obj == NULL) |
| 1571 | return LDPS_ERR; |
| 1572 | Symbol_table* symtab = plugins->symtab(); |
| 1573 | return plugin_obj->get_symbol_resolution_info(symtab, nsyms, syms, 2); |
| 1574 | } |
| 1575 | |
| 1576 | // Version 3 of the above. The only difference from v2 is that it |
| 1577 | // returns LDPS_NO_SYMS instead of LDPS_OK for the objects we never |
| 1578 | // decided to include. |
| 1579 | |
| 1580 | static enum ld_plugin_status |
| 1581 | get_symbols_v3(const void* handle, int nsyms, ld_plugin_symbol* syms) |
| 1582 | { |
| 1583 | gold_assert(parameters->options().has_plugins()); |
| 1584 | Plugin_manager* plugins = parameters->options().plugins(); |
| 1585 | Object* obj = plugins->object( |
| 1586 | static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle))); |
| 1587 | if (obj == NULL) |
| 1588 | return LDPS_ERR; |
| 1589 | Pluginobj* plugin_obj = obj->pluginobj(); |
| 1590 | if (plugin_obj == NULL) |
| 1591 | return LDPS_ERR; |
| 1592 | Symbol_table* symtab = plugins->symtab(); |
| 1593 | return plugin_obj->get_symbol_resolution_info(symtab, nsyms, syms, 3); |
| 1594 | } |
| 1595 | |
| 1596 | // Add a new (real) input file generated by a plugin. |
| 1597 | |
| 1598 | static enum ld_plugin_status |
| 1599 | add_input_file(const char* pathname) |
| 1600 | { |
| 1601 | gold_assert(parameters->options().has_plugins()); |
| 1602 | return parameters->options().plugins()->add_input_file(pathname, false); |
| 1603 | } |
| 1604 | |
| 1605 | // Add a new (real) library required by a plugin. |
| 1606 | |
| 1607 | static enum ld_plugin_status |
| 1608 | add_input_library(const char* pathname) |
| 1609 | { |
| 1610 | gold_assert(parameters->options().has_plugins()); |
| 1611 | return parameters->options().plugins()->add_input_file(pathname, true); |
| 1612 | } |
| 1613 | |
| 1614 | // Set the extra library path to be used by libraries added via |
| 1615 | // add_input_library |
| 1616 | |
| 1617 | static enum ld_plugin_status |
| 1618 | set_extra_library_path(const char* path) |
| 1619 | { |
| 1620 | gold_assert(parameters->options().has_plugins()); |
| 1621 | return parameters->options().plugins()->set_extra_library_path(path); |
| 1622 | } |
| 1623 | |
| 1624 | // Issue a diagnostic message from a plugin. |
| 1625 | |
| 1626 | static enum ld_plugin_status |
| 1627 | message(int level, const char* format, ...) |
| 1628 | { |
| 1629 | va_list args; |
| 1630 | va_start(args, format); |
| 1631 | |
| 1632 | switch (level) |
| 1633 | { |
| 1634 | case LDPL_INFO: |
| 1635 | parameters->errors()->info(format, args); |
| 1636 | break; |
| 1637 | case LDPL_WARNING: |
| 1638 | parameters->errors()->warning(format, args); |
| 1639 | break; |
| 1640 | case LDPL_ERROR: |
| 1641 | default: |
| 1642 | parameters->errors()->error(format, args); |
| 1643 | break; |
| 1644 | case LDPL_FATAL: |
| 1645 | parameters->errors()->fatal(format, args); |
| 1646 | break; |
| 1647 | } |
| 1648 | |
| 1649 | va_end(args); |
| 1650 | return LDPS_OK; |
| 1651 | } |
| 1652 | |
| 1653 | // Get the section count of the object corresponding to the handle. This |
| 1654 | // plugin interface can only be called in the claim_file handler of the plugin. |
| 1655 | |
| 1656 | static enum ld_plugin_status |
| 1657 | get_input_section_count(const void* handle, unsigned int* count) |
| 1658 | { |
| 1659 | gold_assert(parameters->options().has_plugins()); |
| 1660 | |
| 1661 | if (!parameters->options().plugins()->in_claim_file_handler()) |
| 1662 | return LDPS_ERR; |
| 1663 | |
| 1664 | Object* obj = parameters->options().plugins()->get_elf_object(handle); |
| 1665 | |
| 1666 | if (obj == NULL) |
| 1667 | return LDPS_ERR; |
| 1668 | |
| 1669 | *count = obj->shnum(); |
| 1670 | return LDPS_OK; |
| 1671 | } |
| 1672 | |
| 1673 | // Get the type of the specified section in the object corresponding |
| 1674 | // to the handle. This plugin interface can only be called in the |
| 1675 | // claim_file handler of the plugin. |
| 1676 | |
| 1677 | static enum ld_plugin_status |
| 1678 | get_input_section_type(const struct ld_plugin_section section, |
| 1679 | unsigned int* type) |
| 1680 | { |
| 1681 | gold_assert(parameters->options().has_plugins()); |
| 1682 | |
| 1683 | if (!parameters->options().plugins()->in_claim_file_handler()) |
| 1684 | return LDPS_ERR; |
| 1685 | |
| 1686 | Object* obj |
| 1687 | = parameters->options().plugins()->get_elf_object(section.handle); |
| 1688 | |
| 1689 | if (obj == NULL) |
| 1690 | return LDPS_BAD_HANDLE; |
| 1691 | |
| 1692 | *type = obj->section_type(section.shndx); |
| 1693 | return LDPS_OK; |
| 1694 | } |
| 1695 | |
| 1696 | // Get the name of the specified section in the object corresponding |
| 1697 | // to the handle. This plugin interface can only be called in the |
| 1698 | // claim_file handler of the plugin. |
| 1699 | |
| 1700 | static enum ld_plugin_status |
| 1701 | get_input_section_name(const struct ld_plugin_section section, |
| 1702 | char** section_name_ptr) |
| 1703 | { |
| 1704 | gold_assert(parameters->options().has_plugins()); |
| 1705 | |
| 1706 | if (!parameters->options().plugins()->in_claim_file_handler()) |
| 1707 | return LDPS_ERR; |
| 1708 | |
| 1709 | Object* obj |
| 1710 | = parameters->options().plugins()->get_elf_object(section.handle); |
| 1711 | |
| 1712 | if (obj == NULL) |
| 1713 | return LDPS_BAD_HANDLE; |
| 1714 | |
| 1715 | // Check if the object is locked before getting the section name. |
| 1716 | gold_assert(obj->is_locked()); |
| 1717 | |
| 1718 | const std::string section_name = obj->section_name(section.shndx); |
| 1719 | *section_name_ptr = static_cast<char*>(malloc(section_name.length() + 1)); |
| 1720 | memcpy(*section_name_ptr, section_name.c_str(), section_name.length() + 1); |
| 1721 | return LDPS_OK; |
| 1722 | } |
| 1723 | |
| 1724 | // Get the contents of the specified section in the object corresponding |
| 1725 | // to the handle. This plugin interface can only be called in the |
| 1726 | // claim_file handler of the plugin. |
| 1727 | |
| 1728 | static enum ld_plugin_status |
| 1729 | get_input_section_contents(const struct ld_plugin_section section, |
| 1730 | const unsigned char** section_contents_ptr, |
| 1731 | size_t* len) |
| 1732 | { |
| 1733 | gold_assert(parameters->options().has_plugins()); |
| 1734 | |
| 1735 | if (!parameters->options().plugins()->in_claim_file_handler()) |
| 1736 | return LDPS_ERR; |
| 1737 | |
| 1738 | Object* obj |
| 1739 | = parameters->options().plugins()->get_elf_object(section.handle); |
| 1740 | |
| 1741 | if (obj == NULL) |
| 1742 | return LDPS_BAD_HANDLE; |
| 1743 | |
| 1744 | // Check if the object is locked before getting the section contents. |
| 1745 | gold_assert(obj->is_locked()); |
| 1746 | |
| 1747 | section_size_type plen; |
| 1748 | *section_contents_ptr |
| 1749 | = obj->section_contents(section.shndx, &plen, false); |
| 1750 | *len = plen; |
| 1751 | return LDPS_OK; |
| 1752 | } |
| 1753 | |
| 1754 | // Get the alignment of the specified section in the object corresponding |
| 1755 | // to the handle. This plugin interface can only be called in the |
| 1756 | // claim_file handler of the plugin. |
| 1757 | |
| 1758 | static enum ld_plugin_status |
| 1759 | get_input_section_alignment(const struct ld_plugin_section section, |
| 1760 | unsigned int* addralign) |
| 1761 | { |
| 1762 | gold_assert(parameters->options().has_plugins()); |
| 1763 | |
| 1764 | if (!parameters->options().plugins()->in_claim_file_handler()) |
| 1765 | return LDPS_ERR; |
| 1766 | |
| 1767 | Object* obj |
| 1768 | = parameters->options().plugins()->get_elf_object(section.handle); |
| 1769 | |
| 1770 | if (obj == NULL) |
| 1771 | return LDPS_BAD_HANDLE; |
| 1772 | |
| 1773 | *addralign = obj->section_addralign(section.shndx); |
| 1774 | return LDPS_OK; |
| 1775 | } |
| 1776 | |
| 1777 | // Get the size of the specified section in the object corresponding |
| 1778 | // to the handle. This plugin interface can only be called in the |
| 1779 | // claim_file handler of the plugin. |
| 1780 | |
| 1781 | static enum ld_plugin_status |
| 1782 | get_input_section_size(const struct ld_plugin_section section, |
| 1783 | uint64_t* secsize) |
| 1784 | { |
| 1785 | gold_assert(parameters->options().has_plugins()); |
| 1786 | |
| 1787 | if (!parameters->options().plugins()->in_claim_file_handler()) |
| 1788 | return LDPS_ERR; |
| 1789 | |
| 1790 | Object* obj |
| 1791 | = parameters->options().plugins()->get_elf_object(section.handle); |
| 1792 | |
| 1793 | if (obj == NULL) |
| 1794 | return LDPS_BAD_HANDLE; |
| 1795 | |
| 1796 | *secsize = obj->section_size(section.shndx); |
| 1797 | return LDPS_OK; |
| 1798 | } |
| 1799 | |
| 1800 | |
| 1801 | // Specify the ordering of sections in the final layout. The sections are |
| 1802 | // specified as (handle,shndx) pairs in the two arrays in the order in |
| 1803 | // which they should appear in the final layout. |
| 1804 | |
| 1805 | static enum ld_plugin_status |
| 1806 | update_section_order(const struct ld_plugin_section* section_list, |
| 1807 | unsigned int num_sections) |
| 1808 | { |
| 1809 | gold_assert(parameters->options().has_plugins()); |
| 1810 | |
| 1811 | if (num_sections == 0) |
| 1812 | return LDPS_OK; |
| 1813 | |
| 1814 | if (section_list == NULL) |
| 1815 | return LDPS_ERR; |
| 1816 | |
| 1817 | Layout* layout = parameters->options().plugins()->layout(); |
| 1818 | gold_assert (layout != NULL); |
| 1819 | |
| 1820 | std::map<Section_id, unsigned int>* order_map |
| 1821 | = layout->get_section_order_map(); |
| 1822 | |
| 1823 | /* Store the mapping from Section_id to section position in layout's |
| 1824 | order_map to consult after output sections are added. */ |
| 1825 | for (unsigned int i = 0; i < num_sections; ++i) |
| 1826 | { |
| 1827 | Object* obj = parameters->options().plugins()->get_elf_object( |
| 1828 | section_list[i].handle); |
| 1829 | if (obj == NULL || obj->is_dynamic()) |
| 1830 | return LDPS_BAD_HANDLE; |
| 1831 | unsigned int shndx = section_list[i].shndx; |
| 1832 | Section_id secn_id(static_cast<Relobj*>(obj), shndx); |
| 1833 | (*order_map)[secn_id] = i + 1; |
| 1834 | } |
| 1835 | |
| 1836 | return LDPS_OK; |
| 1837 | } |
| 1838 | |
| 1839 | // Let the linker know that the sections could be reordered. |
| 1840 | |
| 1841 | static enum ld_plugin_status |
| 1842 | allow_section_ordering() |
| 1843 | { |
| 1844 | gold_assert(parameters->options().has_plugins()); |
| 1845 | Layout* layout = parameters->options().plugins()->layout(); |
| 1846 | layout->set_section_ordering_specified(); |
| 1847 | return LDPS_OK; |
| 1848 | } |
| 1849 | |
| 1850 | // Let the linker know that a subset of sections could be mapped |
| 1851 | // to a unique segment. |
| 1852 | |
| 1853 | static enum ld_plugin_status |
| 1854 | allow_unique_segment_for_sections() |
| 1855 | { |
| 1856 | gold_assert(parameters->options().has_plugins()); |
| 1857 | Layout* layout = parameters->options().plugins()->layout(); |
| 1858 | layout->set_unique_segment_for_sections_specified(); |
| 1859 | return LDPS_OK; |
| 1860 | } |
| 1861 | |
| 1862 | // This function should map the list of sections specified in the |
| 1863 | // SECTION_LIST to a unique segment. ELF segments do not have names |
| 1864 | // and the NAME is used to identify Output Section which should contain |
| 1865 | // the list of sections. This Output Section will then be mapped to |
| 1866 | // a unique segment. FLAGS is used to specify if any additional segment |
| 1867 | // flags need to be set. For instance, a specific segment flag can be |
| 1868 | // set to identify this segment. Unsetting segment flags is not possible. |
| 1869 | // ALIGN specifies the alignment of the segment. |
| 1870 | |
| 1871 | static enum ld_plugin_status |
| 1872 | unique_segment_for_sections(const char* segment_name, |
| 1873 | uint64_t flags, |
| 1874 | uint64_t align, |
| 1875 | const struct ld_plugin_section* section_list, |
| 1876 | unsigned int num_sections) |
| 1877 | { |
| 1878 | gold_assert(parameters->options().has_plugins()); |
| 1879 | |
| 1880 | if (num_sections == 0) |
| 1881 | return LDPS_OK; |
| 1882 | |
| 1883 | if (section_list == NULL) |
| 1884 | return LDPS_ERR; |
| 1885 | |
| 1886 | Layout* layout = parameters->options().plugins()->layout(); |
| 1887 | gold_assert (layout != NULL); |
| 1888 | |
| 1889 | Layout::Unique_segment_info* s = new Layout::Unique_segment_info; |
| 1890 | s->name = segment_name; |
| 1891 | s->flags = flags; |
| 1892 | s->align = align; |
| 1893 | |
| 1894 | for (unsigned int i = 0; i < num_sections; ++i) |
| 1895 | { |
| 1896 | Object* obj = parameters->options().plugins()->get_elf_object( |
| 1897 | section_list[i].handle); |
| 1898 | if (obj == NULL || obj->is_dynamic()) |
| 1899 | return LDPS_BAD_HANDLE; |
| 1900 | unsigned int shndx = section_list[i].shndx; |
| 1901 | Const_section_id secn_id(static_cast<Relobj*>(obj), shndx); |
| 1902 | layout->insert_section_segment_map(secn_id, s); |
| 1903 | } |
| 1904 | |
| 1905 | return LDPS_OK; |
| 1906 | } |
| 1907 | |
| 1908 | #endif // ENABLE_PLUGINS |
| 1909 | |
| 1910 | // Allocate a Pluginobj object of the appropriate size and endianness. |
| 1911 | |
| 1912 | static Pluginobj* |
| 1913 | make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize) |
| 1914 | { |
| 1915 | Pluginobj* obj = NULL; |
| 1916 | |
| 1917 | parameters_force_valid_target(); |
| 1918 | const Target& target(parameters->target()); |
| 1919 | |
| 1920 | if (target.get_size() == 32) |
| 1921 | { |
| 1922 | if (target.is_big_endian()) |
| 1923 | #ifdef HAVE_TARGET_32_BIG |
| 1924 | obj = new Sized_pluginobj<32, true>(input_file->filename(), |
| 1925 | input_file, offset, filesize); |
| 1926 | #else |
| 1927 | gold_error(_("%s: not configured to support " |
| 1928 | "32-bit big-endian object"), |
| 1929 | input_file->filename().c_str()); |
| 1930 | #endif |
| 1931 | else |
| 1932 | #ifdef HAVE_TARGET_32_LITTLE |
| 1933 | obj = new Sized_pluginobj<32, false>(input_file->filename(), |
| 1934 | input_file, offset, filesize); |
| 1935 | #else |
| 1936 | gold_error(_("%s: not configured to support " |
| 1937 | "32-bit little-endian object"), |
| 1938 | input_file->filename().c_str()); |
| 1939 | #endif |
| 1940 | } |
| 1941 | else if (target.get_size() == 64) |
| 1942 | { |
| 1943 | if (target.is_big_endian()) |
| 1944 | #ifdef HAVE_TARGET_64_BIG |
| 1945 | obj = new Sized_pluginobj<64, true>(input_file->filename(), |
| 1946 | input_file, offset, filesize); |
| 1947 | #else |
| 1948 | gold_error(_("%s: not configured to support " |
| 1949 | "64-bit big-endian object"), |
| 1950 | input_file->filename().c_str()); |
| 1951 | #endif |
| 1952 | else |
| 1953 | #ifdef HAVE_TARGET_64_LITTLE |
| 1954 | obj = new Sized_pluginobj<64, false>(input_file->filename(), |
| 1955 | input_file, offset, filesize); |
| 1956 | #else |
| 1957 | gold_error(_("%s: not configured to support " |
| 1958 | "64-bit little-endian object"), |
| 1959 | input_file->filename().c_str()); |
| 1960 | #endif |
| 1961 | } |
| 1962 | |
| 1963 | gold_assert(obj != NULL); |
| 1964 | return obj; |
| 1965 | } |
| 1966 | |
| 1967 | } // End namespace gold. |