| 1 | // object.cc -- support for an object file for linking in gold |
| 2 | |
| 3 | // Copyright (C) 2006-2018 Free Software Foundation, Inc. |
| 4 | // Written by Ian Lance Taylor <iant@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 <cerrno> |
| 26 | #include <cstring> |
| 27 | #include <cstdarg> |
| 28 | #include "demangle.h" |
| 29 | #include "libiberty.h" |
| 30 | |
| 31 | #include "gc.h" |
| 32 | #include "target-select.h" |
| 33 | #include "dwarf_reader.h" |
| 34 | #include "layout.h" |
| 35 | #include "output.h" |
| 36 | #include "symtab.h" |
| 37 | #include "cref.h" |
| 38 | #include "reloc.h" |
| 39 | #include "object.h" |
| 40 | #include "dynobj.h" |
| 41 | #include "plugin.h" |
| 42 | #include "compressed_output.h" |
| 43 | #include "incremental.h" |
| 44 | #include "merge.h" |
| 45 | |
| 46 | namespace gold |
| 47 | { |
| 48 | |
| 49 | // Struct Read_symbols_data. |
| 50 | |
| 51 | // Destroy any remaining File_view objects and buffers of decompressed |
| 52 | // sections. |
| 53 | |
| 54 | Read_symbols_data::~Read_symbols_data() |
| 55 | { |
| 56 | if (this->section_headers != NULL) |
| 57 | delete this->section_headers; |
| 58 | if (this->section_names != NULL) |
| 59 | delete this->section_names; |
| 60 | if (this->symbols != NULL) |
| 61 | delete this->symbols; |
| 62 | if (this->symbol_names != NULL) |
| 63 | delete this->symbol_names; |
| 64 | if (this->versym != NULL) |
| 65 | delete this->versym; |
| 66 | if (this->verdef != NULL) |
| 67 | delete this->verdef; |
| 68 | if (this->verneed != NULL) |
| 69 | delete this->verneed; |
| 70 | } |
| 71 | |
| 72 | // Class Xindex. |
| 73 | |
| 74 | // Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX |
| 75 | // section and read it in. SYMTAB_SHNDX is the index of the symbol |
| 76 | // table we care about. |
| 77 | |
| 78 | template<int size, bool big_endian> |
| 79 | void |
| 80 | Xindex::initialize_symtab_xindex(Object* object, unsigned int symtab_shndx) |
| 81 | { |
| 82 | if (!this->symtab_xindex_.empty()) |
| 83 | return; |
| 84 | |
| 85 | gold_assert(symtab_shndx != 0); |
| 86 | |
| 87 | // Look through the sections in reverse order, on the theory that it |
| 88 | // is more likely to be near the end than the beginning. |
| 89 | unsigned int i = object->shnum(); |
| 90 | while (i > 0) |
| 91 | { |
| 92 | --i; |
| 93 | if (object->section_type(i) == elfcpp::SHT_SYMTAB_SHNDX |
| 94 | && this->adjust_shndx(object->section_link(i)) == symtab_shndx) |
| 95 | { |
| 96 | this->read_symtab_xindex<size, big_endian>(object, i, NULL); |
| 97 | return; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | object->error(_("missing SHT_SYMTAB_SHNDX section")); |
| 102 | } |
| 103 | |
| 104 | // Read in the symtab_xindex_ array, given the section index of the |
| 105 | // SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the |
| 106 | // section headers. |
| 107 | |
| 108 | template<int size, bool big_endian> |
| 109 | void |
| 110 | Xindex::read_symtab_xindex(Object* object, unsigned int xindex_shndx, |
| 111 | const unsigned char* pshdrs) |
| 112 | { |
| 113 | section_size_type bytecount; |
| 114 | const unsigned char* contents; |
| 115 | if (pshdrs == NULL) |
| 116 | contents = object->section_contents(xindex_shndx, &bytecount, false); |
| 117 | else |
| 118 | { |
| 119 | const unsigned char* p = (pshdrs |
| 120 | + (xindex_shndx |
| 121 | * elfcpp::Elf_sizes<size>::shdr_size)); |
| 122 | typename elfcpp::Shdr<size, big_endian> shdr(p); |
| 123 | bytecount = convert_to_section_size_type(shdr.get_sh_size()); |
| 124 | contents = object->get_view(shdr.get_sh_offset(), bytecount, true, false); |
| 125 | } |
| 126 | |
| 127 | gold_assert(this->symtab_xindex_.empty()); |
| 128 | this->symtab_xindex_.reserve(bytecount / 4); |
| 129 | for (section_size_type i = 0; i < bytecount; i += 4) |
| 130 | { |
| 131 | unsigned int shndx = elfcpp::Swap<32, big_endian>::readval(contents + i); |
| 132 | // We preadjust the section indexes we save. |
| 133 | this->symtab_xindex_.push_back(this->adjust_shndx(shndx)); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | // Symbol symndx has a section of SHN_XINDEX; return the real section |
| 138 | // index. |
| 139 | |
| 140 | unsigned int |
| 141 | Xindex::sym_xindex_to_shndx(Object* object, unsigned int symndx) |
| 142 | { |
| 143 | if (symndx >= this->symtab_xindex_.size()) |
| 144 | { |
| 145 | object->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"), |
| 146 | symndx); |
| 147 | return elfcpp::SHN_UNDEF; |
| 148 | } |
| 149 | unsigned int shndx = this->symtab_xindex_[symndx]; |
| 150 | if (shndx < elfcpp::SHN_LORESERVE || shndx >= object->shnum()) |
| 151 | { |
| 152 | object->error(_("extended index for symbol %u out of range: %u"), |
| 153 | symndx, shndx); |
| 154 | return elfcpp::SHN_UNDEF; |
| 155 | } |
| 156 | return shndx; |
| 157 | } |
| 158 | |
| 159 | // Class Object. |
| 160 | |
| 161 | // Report an error for this object file. This is used by the |
| 162 | // elfcpp::Elf_file interface, and also called by the Object code |
| 163 | // itself. |
| 164 | |
| 165 | void |
| 166 | Object::error(const char* format, ...) const |
| 167 | { |
| 168 | va_list args; |
| 169 | va_start(args, format); |
| 170 | char* buf = NULL; |
| 171 | if (vasprintf(&buf, format, args) < 0) |
| 172 | gold_nomem(); |
| 173 | va_end(args); |
| 174 | gold_error(_("%s: %s"), this->name().c_str(), buf); |
| 175 | free(buf); |
| 176 | } |
| 177 | |
| 178 | // Return a view of the contents of a section. |
| 179 | |
| 180 | const unsigned char* |
| 181 | Object::section_contents(unsigned int shndx, section_size_type* plen, |
| 182 | bool cache) |
| 183 | { return this->do_section_contents(shndx, plen, cache); } |
| 184 | |
| 185 | // Read the section data into SD. This is code common to Sized_relobj_file |
| 186 | // and Sized_dynobj, so we put it into Object. |
| 187 | |
| 188 | template<int size, bool big_endian> |
| 189 | void |
| 190 | Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file, |
| 191 | Read_symbols_data* sd) |
| 192 | { |
| 193 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 194 | |
| 195 | // Read the section headers. |
| 196 | const off_t shoff = elf_file->shoff(); |
| 197 | const unsigned int shnum = this->shnum(); |
| 198 | sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size, |
| 199 | true, true); |
| 200 | |
| 201 | // Read the section names. |
| 202 | const unsigned char* pshdrs = sd->section_headers->data(); |
| 203 | const unsigned char* pshdrnames = pshdrs + elf_file->shstrndx() * shdr_size; |
| 204 | typename elfcpp::Shdr<size, big_endian> shdrnames(pshdrnames); |
| 205 | |
| 206 | if (shdrnames.get_sh_type() != elfcpp::SHT_STRTAB) |
| 207 | this->error(_("section name section has wrong type: %u"), |
| 208 | static_cast<unsigned int>(shdrnames.get_sh_type())); |
| 209 | |
| 210 | sd->section_names_size = |
| 211 | convert_to_section_size_type(shdrnames.get_sh_size()); |
| 212 | sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(), |
| 213 | sd->section_names_size, false, |
| 214 | false); |
| 215 | } |
| 216 | |
| 217 | // If NAME is the name of a special .gnu.warning section, arrange for |
| 218 | // the warning to be issued. SHNDX is the section index. Return |
| 219 | // whether it is a warning section. |
| 220 | |
| 221 | bool |
| 222 | Object::handle_gnu_warning_section(const char* name, unsigned int shndx, |
| 223 | Symbol_table* symtab) |
| 224 | { |
| 225 | const char warn_prefix[] = ".gnu.warning."; |
| 226 | const int warn_prefix_len = sizeof warn_prefix - 1; |
| 227 | if (strncmp(name, warn_prefix, warn_prefix_len) == 0) |
| 228 | { |
| 229 | // Read the section contents to get the warning text. It would |
| 230 | // be nicer if we only did this if we have to actually issue a |
| 231 | // warning. Unfortunately, warnings are issued as we relocate |
| 232 | // sections. That means that we can not lock the object then, |
| 233 | // as we might try to issue the same warning multiple times |
| 234 | // simultaneously. |
| 235 | section_size_type len; |
| 236 | const unsigned char* contents = this->section_contents(shndx, &len, |
| 237 | false); |
| 238 | if (len == 0) |
| 239 | { |
| 240 | const char* warning = name + warn_prefix_len; |
| 241 | contents = reinterpret_cast<const unsigned char*>(warning); |
| 242 | len = strlen(warning); |
| 243 | } |
| 244 | std::string warning(reinterpret_cast<const char*>(contents), len); |
| 245 | symtab->add_warning(name + warn_prefix_len, this, warning); |
| 246 | return true; |
| 247 | } |
| 248 | return false; |
| 249 | } |
| 250 | |
| 251 | // If NAME is the name of the special section which indicates that |
| 252 | // this object was compiled with -fsplit-stack, mark it accordingly. |
| 253 | |
| 254 | bool |
| 255 | Object::handle_split_stack_section(const char* name) |
| 256 | { |
| 257 | if (strcmp(name, ".note.GNU-split-stack") == 0) |
| 258 | { |
| 259 | this->uses_split_stack_ = true; |
| 260 | return true; |
| 261 | } |
| 262 | if (strcmp(name, ".note.GNU-no-split-stack") == 0) |
| 263 | { |
| 264 | this->has_no_split_stack_ = true; |
| 265 | return true; |
| 266 | } |
| 267 | return false; |
| 268 | } |
| 269 | |
| 270 | // Class Relobj |
| 271 | |
| 272 | template<int size> |
| 273 | void |
| 274 | Relobj::initialize_input_to_output_map(unsigned int shndx, |
| 275 | typename elfcpp::Elf_types<size>::Elf_Addr starting_address, |
| 276 | Unordered_map<section_offset_type, |
| 277 | typename elfcpp::Elf_types<size>::Elf_Addr>* output_addresses) const { |
| 278 | Object_merge_map *map = this->object_merge_map_; |
| 279 | map->initialize_input_to_output_map<size>(shndx, starting_address, |
| 280 | output_addresses); |
| 281 | } |
| 282 | |
| 283 | void |
| 284 | Relobj::add_merge_mapping(Output_section_data *output_data, |
| 285 | unsigned int shndx, section_offset_type offset, |
| 286 | section_size_type length, |
| 287 | section_offset_type output_offset) { |
| 288 | Object_merge_map* object_merge_map = this->get_or_create_merge_map(); |
| 289 | object_merge_map->add_mapping(output_data, shndx, offset, length, output_offset); |
| 290 | } |
| 291 | |
| 292 | bool |
| 293 | Relobj::merge_output_offset(unsigned int shndx, section_offset_type offset, |
| 294 | section_offset_type *poutput) const { |
| 295 | Object_merge_map* object_merge_map = this->object_merge_map_; |
| 296 | if (object_merge_map == NULL) |
| 297 | return false; |
| 298 | return object_merge_map->get_output_offset(shndx, offset, poutput); |
| 299 | } |
| 300 | |
| 301 | const Output_section_data* |
| 302 | Relobj::find_merge_section(unsigned int shndx) const { |
| 303 | Object_merge_map* object_merge_map = this->object_merge_map_; |
| 304 | if (object_merge_map == NULL) |
| 305 | return NULL; |
| 306 | return object_merge_map->find_merge_section(shndx); |
| 307 | } |
| 308 | |
| 309 | // To copy the symbols data read from the file to a local data structure. |
| 310 | // This function is called from do_layout only while doing garbage |
| 311 | // collection. |
| 312 | |
| 313 | void |
| 314 | Relobj::copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd, |
| 315 | unsigned int section_header_size) |
| 316 | { |
| 317 | gc_sd->section_headers_data = |
| 318 | new unsigned char[(section_header_size)]; |
| 319 | memcpy(gc_sd->section_headers_data, sd->section_headers->data(), |
| 320 | section_header_size); |
| 321 | gc_sd->section_names_data = |
| 322 | new unsigned char[sd->section_names_size]; |
| 323 | memcpy(gc_sd->section_names_data, sd->section_names->data(), |
| 324 | sd->section_names_size); |
| 325 | gc_sd->section_names_size = sd->section_names_size; |
| 326 | if (sd->symbols != NULL) |
| 327 | { |
| 328 | gc_sd->symbols_data = |
| 329 | new unsigned char[sd->symbols_size]; |
| 330 | memcpy(gc_sd->symbols_data, sd->symbols->data(), |
| 331 | sd->symbols_size); |
| 332 | } |
| 333 | else |
| 334 | { |
| 335 | gc_sd->symbols_data = NULL; |
| 336 | } |
| 337 | gc_sd->symbols_size = sd->symbols_size; |
| 338 | gc_sd->external_symbols_offset = sd->external_symbols_offset; |
| 339 | if (sd->symbol_names != NULL) |
| 340 | { |
| 341 | gc_sd->symbol_names_data = |
| 342 | new unsigned char[sd->symbol_names_size]; |
| 343 | memcpy(gc_sd->symbol_names_data, sd->symbol_names->data(), |
| 344 | sd->symbol_names_size); |
| 345 | } |
| 346 | else |
| 347 | { |
| 348 | gc_sd->symbol_names_data = NULL; |
| 349 | } |
| 350 | gc_sd->symbol_names_size = sd->symbol_names_size; |
| 351 | } |
| 352 | |
| 353 | // This function determines if a particular section name must be included |
| 354 | // in the link. This is used during garbage collection to determine the |
| 355 | // roots of the worklist. |
| 356 | |
| 357 | bool |
| 358 | Relobj::is_section_name_included(const char* name) |
| 359 | { |
| 360 | if (is_prefix_of(".ctors", name) |
| 361 | || is_prefix_of(".dtors", name) |
| 362 | || is_prefix_of(".note", name) |
| 363 | || is_prefix_of(".init", name) |
| 364 | || is_prefix_of(".fini", name) |
| 365 | || is_prefix_of(".gcc_except_table", name) |
| 366 | || is_prefix_of(".jcr", name) |
| 367 | || is_prefix_of(".preinit_array", name) |
| 368 | || (is_prefix_of(".text", name) |
| 369 | && strstr(name, "personality")) |
| 370 | || (is_prefix_of(".data", name) |
| 371 | && strstr(name, "personality")) |
| 372 | || (is_prefix_of(".sdata", name) |
| 373 | && strstr(name, "personality")) |
| 374 | || (is_prefix_of(".gnu.linkonce.d", name) |
| 375 | && strstr(name, "personality")) |
| 376 | || (is_prefix_of(".rodata", name) |
| 377 | && strstr(name, "nptl_version"))) |
| 378 | { |
| 379 | return true; |
| 380 | } |
| 381 | return false; |
| 382 | } |
| 383 | |
| 384 | // Finalize the incremental relocation information. Allocates a block |
| 385 | // of relocation entries for each symbol, and sets the reloc_bases_ |
| 386 | // array to point to the first entry in each block. If CLEAR_COUNTS |
| 387 | // is TRUE, also clear the per-symbol relocation counters. |
| 388 | |
| 389 | void |
| 390 | Relobj::finalize_incremental_relocs(Layout* layout, bool clear_counts) |
| 391 | { |
| 392 | unsigned int nsyms = this->get_global_symbols()->size(); |
| 393 | this->reloc_bases_ = new unsigned int[nsyms]; |
| 394 | |
| 395 | gold_assert(this->reloc_bases_ != NULL); |
| 396 | gold_assert(layout->incremental_inputs() != NULL); |
| 397 | |
| 398 | unsigned int rindex = layout->incremental_inputs()->get_reloc_count(); |
| 399 | for (unsigned int i = 0; i < nsyms; ++i) |
| 400 | { |
| 401 | this->reloc_bases_[i] = rindex; |
| 402 | rindex += this->reloc_counts_[i]; |
| 403 | if (clear_counts) |
| 404 | this->reloc_counts_[i] = 0; |
| 405 | } |
| 406 | layout->incremental_inputs()->set_reloc_count(rindex); |
| 407 | } |
| 408 | |
| 409 | Object_merge_map* |
| 410 | Relobj::get_or_create_merge_map() |
| 411 | { |
| 412 | if (!this->object_merge_map_) |
| 413 | this->object_merge_map_ = new Object_merge_map(); |
| 414 | return this->object_merge_map_; |
| 415 | } |
| 416 | |
| 417 | // Class Sized_relobj. |
| 418 | |
| 419 | // Iterate over local symbols, calling a visitor class V for each GOT offset |
| 420 | // associated with a local symbol. |
| 421 | |
| 422 | template<int size, bool big_endian> |
| 423 | void |
| 424 | Sized_relobj<size, big_endian>::do_for_all_local_got_entries( |
| 425 | Got_offset_list::Visitor* v) const |
| 426 | { |
| 427 | unsigned int nsyms = this->local_symbol_count(); |
| 428 | for (unsigned int i = 0; i < nsyms; i++) |
| 429 | { |
| 430 | Local_got_entry_key key(i, 0); |
| 431 | Local_got_offsets::const_iterator p = this->local_got_offsets_.find(key); |
| 432 | if (p != this->local_got_offsets_.end()) |
| 433 | { |
| 434 | const Got_offset_list* got_offsets = p->second; |
| 435 | got_offsets->for_all_got_offsets(v); |
| 436 | } |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | // Get the address of an output section. |
| 441 | |
| 442 | template<int size, bool big_endian> |
| 443 | uint64_t |
| 444 | Sized_relobj<size, big_endian>::do_output_section_address( |
| 445 | unsigned int shndx) |
| 446 | { |
| 447 | // If the input file is linked as --just-symbols, the output |
| 448 | // section address is the input section address. |
| 449 | if (this->just_symbols()) |
| 450 | return this->section_address(shndx); |
| 451 | |
| 452 | const Output_section* os = this->do_output_section(shndx); |
| 453 | gold_assert(os != NULL); |
| 454 | return os->address(); |
| 455 | } |
| 456 | |
| 457 | // Class Sized_relobj_file. |
| 458 | |
| 459 | template<int size, bool big_endian> |
| 460 | Sized_relobj_file<size, big_endian>::Sized_relobj_file( |
| 461 | const std::string& name, |
| 462 | Input_file* input_file, |
| 463 | off_t offset, |
| 464 | const elfcpp::Ehdr<size, big_endian>& ehdr) |
| 465 | : Sized_relobj<size, big_endian>(name, input_file, offset), |
| 466 | elf_file_(this, ehdr), |
| 467 | symtab_shndx_(-1U), |
| 468 | local_symbol_count_(0), |
| 469 | output_local_symbol_count_(0), |
| 470 | output_local_dynsym_count_(0), |
| 471 | symbols_(), |
| 472 | defined_count_(0), |
| 473 | local_symbol_offset_(0), |
| 474 | local_dynsym_offset_(0), |
| 475 | local_values_(), |
| 476 | local_plt_offsets_(), |
| 477 | kept_comdat_sections_(), |
| 478 | has_eh_frame_(false), |
| 479 | is_deferred_layout_(false), |
| 480 | deferred_layout_(), |
| 481 | deferred_layout_relocs_(), |
| 482 | output_views_(NULL) |
| 483 | { |
| 484 | this->e_type_ = ehdr.get_e_type(); |
| 485 | } |
| 486 | |
| 487 | template<int size, bool big_endian> |
| 488 | Sized_relobj_file<size, big_endian>::~Sized_relobj_file() |
| 489 | { |
| 490 | } |
| 491 | |
| 492 | // Set up an object file based on the file header. This sets up the |
| 493 | // section information. |
| 494 | |
| 495 | template<int size, bool big_endian> |
| 496 | void |
| 497 | Sized_relobj_file<size, big_endian>::do_setup() |
| 498 | { |
| 499 | const unsigned int shnum = this->elf_file_.shnum(); |
| 500 | this->set_shnum(shnum); |
| 501 | } |
| 502 | |
| 503 | // Find the SHT_SYMTAB section, given the section headers. The ELF |
| 504 | // standard says that maybe in the future there can be more than one |
| 505 | // SHT_SYMTAB section. Until somebody figures out how that could |
| 506 | // work, we assume there is only one. |
| 507 | |
| 508 | template<int size, bool big_endian> |
| 509 | void |
| 510 | Sized_relobj_file<size, big_endian>::find_symtab(const unsigned char* pshdrs) |
| 511 | { |
| 512 | const unsigned int shnum = this->shnum(); |
| 513 | this->symtab_shndx_ = 0; |
| 514 | if (shnum > 0) |
| 515 | { |
| 516 | // Look through the sections in reverse order, since gas tends |
| 517 | // to put the symbol table at the end. |
| 518 | const unsigned char* p = pshdrs + shnum * This::shdr_size; |
| 519 | unsigned int i = shnum; |
| 520 | unsigned int xindex_shndx = 0; |
| 521 | unsigned int xindex_link = 0; |
| 522 | while (i > 0) |
| 523 | { |
| 524 | --i; |
| 525 | p -= This::shdr_size; |
| 526 | typename This::Shdr shdr(p); |
| 527 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) |
| 528 | { |
| 529 | this->symtab_shndx_ = i; |
| 530 | if (xindex_shndx > 0 && xindex_link == i) |
| 531 | { |
| 532 | Xindex* xindex = |
| 533 | new Xindex(this->elf_file_.large_shndx_offset()); |
| 534 | xindex->read_symtab_xindex<size, big_endian>(this, |
| 535 | xindex_shndx, |
| 536 | pshdrs); |
| 537 | this->set_xindex(xindex); |
| 538 | } |
| 539 | break; |
| 540 | } |
| 541 | |
| 542 | // Try to pick up the SHT_SYMTAB_SHNDX section, if there is |
| 543 | // one. This will work if it follows the SHT_SYMTAB |
| 544 | // section. |
| 545 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX) |
| 546 | { |
| 547 | xindex_shndx = i; |
| 548 | xindex_link = this->adjust_shndx(shdr.get_sh_link()); |
| 549 | } |
| 550 | } |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | // Return the Xindex structure to use for object with lots of |
| 555 | // sections. |
| 556 | |
| 557 | template<int size, bool big_endian> |
| 558 | Xindex* |
| 559 | Sized_relobj_file<size, big_endian>::do_initialize_xindex() |
| 560 | { |
| 561 | gold_assert(this->symtab_shndx_ != -1U); |
| 562 | Xindex* xindex = new Xindex(this->elf_file_.large_shndx_offset()); |
| 563 | xindex->initialize_symtab_xindex<size, big_endian>(this, this->symtab_shndx_); |
| 564 | return xindex; |
| 565 | } |
| 566 | |
| 567 | // Return whether SHDR has the right type and flags to be a GNU |
| 568 | // .eh_frame section. |
| 569 | |
| 570 | template<int size, bool big_endian> |
| 571 | bool |
| 572 | Sized_relobj_file<size, big_endian>::check_eh_frame_flags( |
| 573 | const elfcpp::Shdr<size, big_endian>* shdr) const |
| 574 | { |
| 575 | elfcpp::Elf_Word sh_type = shdr->get_sh_type(); |
| 576 | return ((sh_type == elfcpp::SHT_PROGBITS |
| 577 | || sh_type == parameters->target().unwind_section_type()) |
| 578 | && (shdr->get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
| 579 | } |
| 580 | |
| 581 | // Find the section header with the given name. |
| 582 | |
| 583 | template<int size, bool big_endian> |
| 584 | const unsigned char* |
| 585 | Object::find_shdr( |
| 586 | const unsigned char* pshdrs, |
| 587 | const char* name, |
| 588 | const char* names, |
| 589 | section_size_type names_size, |
| 590 | const unsigned char* hdr) const |
| 591 | { |
| 592 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 593 | const unsigned int shnum = this->shnum(); |
| 594 | const unsigned char* hdr_end = pshdrs + shdr_size * shnum; |
| 595 | size_t sh_name = 0; |
| 596 | |
| 597 | while (1) |
| 598 | { |
| 599 | if (hdr) |
| 600 | { |
| 601 | // We found HDR last time we were called, continue looking. |
| 602 | typename elfcpp::Shdr<size, big_endian> shdr(hdr); |
| 603 | sh_name = shdr.get_sh_name(); |
| 604 | } |
| 605 | else |
| 606 | { |
| 607 | // Look for the next occurrence of NAME in NAMES. |
| 608 | // The fact that .shstrtab produced by current GNU tools is |
| 609 | // string merged means we shouldn't have both .not.foo and |
| 610 | // .foo in .shstrtab, and multiple .foo sections should all |
| 611 | // have the same sh_name. However, this is not guaranteed |
| 612 | // by the ELF spec and not all ELF object file producers may |
| 613 | // be so clever. |
| 614 | size_t len = strlen(name) + 1; |
| 615 | const char *p = sh_name ? names + sh_name + len : names; |
| 616 | p = reinterpret_cast<const char*>(memmem(p, names_size - (p - names), |
| 617 | name, len)); |
| 618 | if (p == NULL) |
| 619 | return NULL; |
| 620 | sh_name = p - names; |
| 621 | hdr = pshdrs; |
| 622 | if (sh_name == 0) |
| 623 | return hdr; |
| 624 | } |
| 625 | |
| 626 | hdr += shdr_size; |
| 627 | while (hdr < hdr_end) |
| 628 | { |
| 629 | typename elfcpp::Shdr<size, big_endian> shdr(hdr); |
| 630 | if (shdr.get_sh_name() == sh_name) |
| 631 | return hdr; |
| 632 | hdr += shdr_size; |
| 633 | } |
| 634 | hdr = NULL; |
| 635 | if (sh_name == 0) |
| 636 | return hdr; |
| 637 | } |
| 638 | } |
| 639 | |
| 640 | // Return whether there is a GNU .eh_frame section, given the section |
| 641 | // headers and the section names. |
| 642 | |
| 643 | template<int size, bool big_endian> |
| 644 | bool |
| 645 | Sized_relobj_file<size, big_endian>::find_eh_frame( |
| 646 | const unsigned char* pshdrs, |
| 647 | const char* names, |
| 648 | section_size_type names_size) const |
| 649 | { |
| 650 | const unsigned char* s = NULL; |
| 651 | |
| 652 | while (1) |
| 653 | { |
| 654 | s = this->template find_shdr<size, big_endian>(pshdrs, ".eh_frame", |
| 655 | names, names_size, s); |
| 656 | if (s == NULL) |
| 657 | return false; |
| 658 | |
| 659 | typename This::Shdr shdr(s); |
| 660 | if (this->check_eh_frame_flags(&shdr)) |
| 661 | return true; |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | // Return TRUE if this is a section whose contents will be needed in the |
| 666 | // Add_symbols task. This function is only called for sections that have |
| 667 | // already passed the test in is_compressed_debug_section() and the debug |
| 668 | // section name prefix, ".debug"/".zdebug", has been skipped. |
| 669 | |
| 670 | static bool |
| 671 | need_decompressed_section(const char* name) |
| 672 | { |
| 673 | if (*name++ != '_') |
| 674 | return false; |
| 675 | |
| 676 | #ifdef ENABLE_THREADS |
| 677 | // Decompressing these sections now will help only if we're |
| 678 | // multithreaded. |
| 679 | if (parameters->options().threads()) |
| 680 | { |
| 681 | // We will need .zdebug_str if this is not an incremental link |
| 682 | // (i.e., we are processing string merge sections) or if we need |
| 683 | // to build a gdb index. |
| 684 | if ((!parameters->incremental() || parameters->options().gdb_index()) |
| 685 | && strcmp(name, "str") == 0) |
| 686 | return true; |
| 687 | |
| 688 | // We will need these other sections when building a gdb index. |
| 689 | if (parameters->options().gdb_index() |
| 690 | && (strcmp(name, "info") == 0 |
| 691 | || strcmp(name, "types") == 0 |
| 692 | || strcmp(name, "pubnames") == 0 |
| 693 | || strcmp(name, "pubtypes") == 0 |
| 694 | || strcmp(name, "ranges") == 0 |
| 695 | || strcmp(name, "abbrev") == 0)) |
| 696 | return true; |
| 697 | } |
| 698 | #endif |
| 699 | |
| 700 | // Even when single-threaded, we will need .zdebug_str if this is |
| 701 | // not an incremental link and we are building a gdb index. |
| 702 | // Otherwise, we would decompress the section twice: once for |
| 703 | // string merge processing, and once for building the gdb index. |
| 704 | if (!parameters->incremental() |
| 705 | && parameters->options().gdb_index() |
| 706 | && strcmp(name, "str") == 0) |
| 707 | return true; |
| 708 | |
| 709 | return false; |
| 710 | } |
| 711 | |
| 712 | // Build a table for any compressed debug sections, mapping each section index |
| 713 | // to the uncompressed size and (if needed) the decompressed contents. |
| 714 | |
| 715 | template<int size, bool big_endian> |
| 716 | Compressed_section_map* |
| 717 | build_compressed_section_map( |
| 718 | const unsigned char* pshdrs, |
| 719 | unsigned int shnum, |
| 720 | const char* names, |
| 721 | section_size_type names_size, |
| 722 | Object* obj, |
| 723 | bool decompress_if_needed) |
| 724 | { |
| 725 | Compressed_section_map* uncompressed_map = new Compressed_section_map(); |
| 726 | const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 727 | const unsigned char* p = pshdrs + shdr_size; |
| 728 | |
| 729 | for (unsigned int i = 1; i < shnum; ++i, p += shdr_size) |
| 730 | { |
| 731 | typename elfcpp::Shdr<size, big_endian> shdr(p); |
| 732 | if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS |
| 733 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
| 734 | { |
| 735 | if (shdr.get_sh_name() >= names_size) |
| 736 | { |
| 737 | obj->error(_("bad section name offset for section %u: %lu"), |
| 738 | i, static_cast<unsigned long>(shdr.get_sh_name())); |
| 739 | continue; |
| 740 | } |
| 741 | |
| 742 | const char* name = names + shdr.get_sh_name(); |
| 743 | bool is_compressed = ((shdr.get_sh_flags() |
| 744 | & elfcpp::SHF_COMPRESSED) != 0); |
| 745 | bool is_zcompressed = (!is_compressed |
| 746 | && is_compressed_debug_section(name)); |
| 747 | |
| 748 | if (is_zcompressed || is_compressed) |
| 749 | { |
| 750 | section_size_type len; |
| 751 | const unsigned char* contents = |
| 752 | obj->section_contents(i, &len, false); |
| 753 | uint64_t uncompressed_size; |
| 754 | if (is_zcompressed) |
| 755 | { |
| 756 | // Skip over the ".zdebug" prefix. |
| 757 | name += 7; |
| 758 | uncompressed_size = get_uncompressed_size(contents, len); |
| 759 | } |
| 760 | else |
| 761 | { |
| 762 | // Skip over the ".debug" prefix. |
| 763 | name += 6; |
| 764 | elfcpp::Chdr<size, big_endian> chdr(contents); |
| 765 | uncompressed_size = chdr.get_ch_size(); |
| 766 | } |
| 767 | Compressed_section_info info; |
| 768 | info.size = convert_to_section_size_type(uncompressed_size); |
| 769 | info.flag = shdr.get_sh_flags(); |
| 770 | info.contents = NULL; |
| 771 | if (uncompressed_size != -1ULL) |
| 772 | { |
| 773 | unsigned char* uncompressed_data = NULL; |
| 774 | if (decompress_if_needed && need_decompressed_section(name)) |
| 775 | { |
| 776 | uncompressed_data = new unsigned char[uncompressed_size]; |
| 777 | if (decompress_input_section(contents, len, |
| 778 | uncompressed_data, |
| 779 | uncompressed_size, |
| 780 | size, big_endian, |
| 781 | shdr.get_sh_flags())) |
| 782 | info.contents = uncompressed_data; |
| 783 | else |
| 784 | delete[] uncompressed_data; |
| 785 | } |
| 786 | (*uncompressed_map)[i] = info; |
| 787 | } |
| 788 | } |
| 789 | } |
| 790 | } |
| 791 | return uncompressed_map; |
| 792 | } |
| 793 | |
| 794 | // Stash away info for a number of special sections. |
| 795 | // Return true if any of the sections found require local symbols to be read. |
| 796 | |
| 797 | template<int size, bool big_endian> |
| 798 | bool |
| 799 | Sized_relobj_file<size, big_endian>::do_find_special_sections( |
| 800 | Read_symbols_data* sd) |
| 801 | { |
| 802 | const unsigned char* const pshdrs = sd->section_headers->data(); |
| 803 | const unsigned char* namesu = sd->section_names->data(); |
| 804 | const char* names = reinterpret_cast<const char*>(namesu); |
| 805 | |
| 806 | if (this->find_eh_frame(pshdrs, names, sd->section_names_size)) |
| 807 | this->has_eh_frame_ = true; |
| 808 | |
| 809 | Compressed_section_map* compressed_sections = |
| 810 | build_compressed_section_map<size, big_endian>( |
| 811 | pshdrs, this->shnum(), names, sd->section_names_size, this, true); |
| 812 | if (compressed_sections != NULL) |
| 813 | this->set_compressed_sections(compressed_sections); |
| 814 | |
| 815 | return (this->has_eh_frame_ |
| 816 | || (!parameters->options().relocatable() |
| 817 | && parameters->options().gdb_index() |
| 818 | && (memmem(names, sd->section_names_size, "debug_info", 11) != NULL |
| 819 | || memmem(names, sd->section_names_size, |
| 820 | "debug_types", 12) != NULL))); |
| 821 | } |
| 822 | |
| 823 | // Read the sections and symbols from an object file. |
| 824 | |
| 825 | template<int size, bool big_endian> |
| 826 | void |
| 827 | Sized_relobj_file<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
| 828 | { |
| 829 | this->base_read_symbols(sd); |
| 830 | } |
| 831 | |
| 832 | // Read the sections and symbols from an object file. This is common |
| 833 | // code for all target-specific overrides of do_read_symbols(). |
| 834 | |
| 835 | template<int size, bool big_endian> |
| 836 | void |
| 837 | Sized_relobj_file<size, big_endian>::base_read_symbols(Read_symbols_data* sd) |
| 838 | { |
| 839 | this->read_section_data(&this->elf_file_, sd); |
| 840 | |
| 841 | const unsigned char* const pshdrs = sd->section_headers->data(); |
| 842 | |
| 843 | this->find_symtab(pshdrs); |
| 844 | |
| 845 | bool need_local_symbols = this->do_find_special_sections(sd); |
| 846 | |
| 847 | sd->symbols = NULL; |
| 848 | sd->symbols_size = 0; |
| 849 | sd->external_symbols_offset = 0; |
| 850 | sd->symbol_names = NULL; |
| 851 | sd->symbol_names_size = 0; |
| 852 | |
| 853 | if (this->symtab_shndx_ == 0) |
| 854 | { |
| 855 | // No symbol table. Weird but legal. |
| 856 | return; |
| 857 | } |
| 858 | |
| 859 | // Get the symbol table section header. |
| 860 | typename This::Shdr symtabshdr(pshdrs |
| 861 | + this->symtab_shndx_ * This::shdr_size); |
| 862 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
| 863 | |
| 864 | // If this object has a .eh_frame section, or if building a .gdb_index |
| 865 | // section and there is debug info, we need all the symbols. |
| 866 | // Otherwise we only need the external symbols. While it would be |
| 867 | // simpler to just always read all the symbols, I've seen object |
| 868 | // files with well over 2000 local symbols, which for a 64-bit |
| 869 | // object file format is over 5 pages that we don't need to read |
| 870 | // now. |
| 871 | |
| 872 | const int sym_size = This::sym_size; |
| 873 | const unsigned int loccount = symtabshdr.get_sh_info(); |
| 874 | this->local_symbol_count_ = loccount; |
| 875 | this->local_values_.resize(loccount); |
| 876 | section_offset_type locsize = loccount * sym_size; |
| 877 | off_t dataoff = symtabshdr.get_sh_offset(); |
| 878 | section_size_type datasize = |
| 879 | convert_to_section_size_type(symtabshdr.get_sh_size()); |
| 880 | off_t extoff = dataoff + locsize; |
| 881 | section_size_type extsize = datasize - locsize; |
| 882 | |
| 883 | off_t readoff = need_local_symbols ? dataoff : extoff; |
| 884 | section_size_type readsize = need_local_symbols ? datasize : extsize; |
| 885 | |
| 886 | if (readsize == 0) |
| 887 | { |
| 888 | // No external symbols. Also weird but also legal. |
| 889 | return; |
| 890 | } |
| 891 | |
| 892 | File_view* fvsymtab = this->get_lasting_view(readoff, readsize, true, false); |
| 893 | |
| 894 | // Read the section header for the symbol names. |
| 895 | unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link()); |
| 896 | if (strtab_shndx >= this->shnum()) |
| 897 | { |
| 898 | this->error(_("invalid symbol table name index: %u"), strtab_shndx); |
| 899 | return; |
| 900 | } |
| 901 | typename This::Shdr strtabshdr(pshdrs + strtab_shndx * This::shdr_size); |
| 902 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
| 903 | { |
| 904 | this->error(_("symbol table name section has wrong type: %u"), |
| 905 | static_cast<unsigned int>(strtabshdr.get_sh_type())); |
| 906 | return; |
| 907 | } |
| 908 | |
| 909 | // Read the symbol names. |
| 910 | File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(), |
| 911 | strtabshdr.get_sh_size(), |
| 912 | false, true); |
| 913 | |
| 914 | sd->symbols = fvsymtab; |
| 915 | sd->symbols_size = readsize; |
| 916 | sd->external_symbols_offset = need_local_symbols ? locsize : 0; |
| 917 | sd->symbol_names = fvstrtab; |
| 918 | sd->symbol_names_size = |
| 919 | convert_to_section_size_type(strtabshdr.get_sh_size()); |
| 920 | } |
| 921 | |
| 922 | // Return the section index of symbol SYM. Set *VALUE to its value in |
| 923 | // the object file. Set *IS_ORDINARY if this is an ordinary section |
| 924 | // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE. |
| 925 | // Note that for a symbol which is not defined in this object file, |
| 926 | // this will set *VALUE to 0 and return SHN_UNDEF; it will not return |
| 927 | // the final value of the symbol in the link. |
| 928 | |
| 929 | template<int size, bool big_endian> |
| 930 | unsigned int |
| 931 | Sized_relobj_file<size, big_endian>::symbol_section_and_value(unsigned int sym, |
| 932 | Address* value, |
| 933 | bool* is_ordinary) |
| 934 | { |
| 935 | section_size_type symbols_size; |
| 936 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, |
| 937 | &symbols_size, |
| 938 | false); |
| 939 | |
| 940 | const size_t count = symbols_size / This::sym_size; |
| 941 | gold_assert(sym < count); |
| 942 | |
| 943 | elfcpp::Sym<size, big_endian> elfsym(symbols + sym * This::sym_size); |
| 944 | *value = elfsym.get_st_value(); |
| 945 | |
| 946 | return this->adjust_sym_shndx(sym, elfsym.get_st_shndx(), is_ordinary); |
| 947 | } |
| 948 | |
| 949 | // Return whether to include a section group in the link. LAYOUT is |
| 950 | // used to keep track of which section groups we have already seen. |
| 951 | // INDEX is the index of the section group and SHDR is the section |
| 952 | // header. If we do not want to include this group, we set bits in |
| 953 | // OMIT for each section which should be discarded. |
| 954 | |
| 955 | template<int size, bool big_endian> |
| 956 | bool |
| 957 | Sized_relobj_file<size, big_endian>::include_section_group( |
| 958 | Symbol_table* symtab, |
| 959 | Layout* layout, |
| 960 | unsigned int index, |
| 961 | const char* name, |
| 962 | const unsigned char* shdrs, |
| 963 | const char* section_names, |
| 964 | section_size_type section_names_size, |
| 965 | std::vector<bool>* omit) |
| 966 | { |
| 967 | // Read the section contents. |
| 968 | typename This::Shdr shdr(shdrs + index * This::shdr_size); |
| 969 | const unsigned char* pcon = this->get_view(shdr.get_sh_offset(), |
| 970 | shdr.get_sh_size(), true, false); |
| 971 | const elfcpp::Elf_Word* pword = |
| 972 | reinterpret_cast<const elfcpp::Elf_Word*>(pcon); |
| 973 | |
| 974 | // The first word contains flags. We only care about COMDAT section |
| 975 | // groups. Other section groups are always included in the link |
| 976 | // just like ordinary sections. |
| 977 | elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword); |
| 978 | |
| 979 | // Look up the group signature, which is the name of a symbol. ELF |
| 980 | // uses a symbol name because some group signatures are long, and |
| 981 | // the name is generally already in the symbol table, so it makes |
| 982 | // sense to put the long string just once in .strtab rather than in |
| 983 | // both .strtab and .shstrtab. |
| 984 | |
| 985 | // Get the appropriate symbol table header (this will normally be |
| 986 | // the single SHT_SYMTAB section, but in principle it need not be). |
| 987 | const unsigned int link = this->adjust_shndx(shdr.get_sh_link()); |
| 988 | typename This::Shdr symshdr(this, this->elf_file_.section_header(link)); |
| 989 | |
| 990 | // Read the symbol table entry. |
| 991 | unsigned int symndx = shdr.get_sh_info(); |
| 992 | if (symndx >= symshdr.get_sh_size() / This::sym_size) |
| 993 | { |
| 994 | this->error(_("section group %u info %u out of range"), |
| 995 | index, symndx); |
| 996 | return false; |
| 997 | } |
| 998 | off_t symoff = symshdr.get_sh_offset() + symndx * This::sym_size; |
| 999 | const unsigned char* psym = this->get_view(symoff, This::sym_size, true, |
| 1000 | false); |
| 1001 | elfcpp::Sym<size, big_endian> sym(psym); |
| 1002 | |
| 1003 | // Read the symbol table names. |
| 1004 | section_size_type symnamelen; |
| 1005 | const unsigned char* psymnamesu; |
| 1006 | psymnamesu = this->section_contents(this->adjust_shndx(symshdr.get_sh_link()), |
| 1007 | &symnamelen, true); |
| 1008 | const char* psymnames = reinterpret_cast<const char*>(psymnamesu); |
| 1009 | |
| 1010 | // Get the section group signature. |
| 1011 | if (sym.get_st_name() >= symnamelen) |
| 1012 | { |
| 1013 | this->error(_("symbol %u name offset %u out of range"), |
| 1014 | symndx, sym.get_st_name()); |
| 1015 | return false; |
| 1016 | } |
| 1017 | |
| 1018 | std::string signature(psymnames + sym.get_st_name()); |
| 1019 | |
| 1020 | // It seems that some versions of gas will create a section group |
| 1021 | // associated with a section symbol, and then fail to give a name to |
| 1022 | // the section symbol. In such a case, use the name of the section. |
| 1023 | if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION) |
| 1024 | { |
| 1025 | bool is_ordinary; |
| 1026 | unsigned int sym_shndx = this->adjust_sym_shndx(symndx, |
| 1027 | sym.get_st_shndx(), |
| 1028 | &is_ordinary); |
| 1029 | if (!is_ordinary || sym_shndx >= this->shnum()) |
| 1030 | { |
| 1031 | this->error(_("symbol %u invalid section index %u"), |
| 1032 | symndx, sym_shndx); |
| 1033 | return false; |
| 1034 | } |
| 1035 | typename This::Shdr member_shdr(shdrs + sym_shndx * This::shdr_size); |
| 1036 | if (member_shdr.get_sh_name() < section_names_size) |
| 1037 | signature = section_names + member_shdr.get_sh_name(); |
| 1038 | } |
| 1039 | |
| 1040 | // Record this section group in the layout, and see whether we've already |
| 1041 | // seen one with the same signature. |
| 1042 | bool include_group; |
| 1043 | bool is_comdat; |
| 1044 | Kept_section* kept_section = NULL; |
| 1045 | |
| 1046 | if ((flags & elfcpp::GRP_COMDAT) == 0) |
| 1047 | { |
| 1048 | include_group = true; |
| 1049 | is_comdat = false; |
| 1050 | } |
| 1051 | else |
| 1052 | { |
| 1053 | include_group = layout->find_or_add_kept_section(signature, |
| 1054 | this, index, true, |
| 1055 | true, &kept_section); |
| 1056 | is_comdat = true; |
| 1057 | } |
| 1058 | |
| 1059 | if (is_comdat && include_group) |
| 1060 | { |
| 1061 | Incremental_inputs* incremental_inputs = layout->incremental_inputs(); |
| 1062 | if (incremental_inputs != NULL) |
| 1063 | incremental_inputs->report_comdat_group(this, signature.c_str()); |
| 1064 | } |
| 1065 | |
| 1066 | size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word); |
| 1067 | |
| 1068 | std::vector<unsigned int> shndxes; |
| 1069 | bool relocate_group = include_group && parameters->options().relocatable(); |
| 1070 | if (relocate_group) |
| 1071 | shndxes.reserve(count - 1); |
| 1072 | |
| 1073 | for (size_t i = 1; i < count; ++i) |
| 1074 | { |
| 1075 | elfcpp::Elf_Word shndx = |
| 1076 | this->adjust_shndx(elfcpp::Swap<32, big_endian>::readval(pword + i)); |
| 1077 | |
| 1078 | if (relocate_group) |
| 1079 | shndxes.push_back(shndx); |
| 1080 | |
| 1081 | if (shndx >= this->shnum()) |
| 1082 | { |
| 1083 | this->error(_("section %u in section group %u out of range"), |
| 1084 | shndx, index); |
| 1085 | continue; |
| 1086 | } |
| 1087 | |
| 1088 | // Check for an earlier section number, since we're going to get |
| 1089 | // it wrong--we may have already decided to include the section. |
| 1090 | if (shndx < index) |
| 1091 | this->error(_("invalid section group %u refers to earlier section %u"), |
| 1092 | index, shndx); |
| 1093 | |
| 1094 | // Get the name of the member section. |
| 1095 | typename This::Shdr member_shdr(shdrs + shndx * This::shdr_size); |
| 1096 | if (member_shdr.get_sh_name() >= section_names_size) |
| 1097 | { |
| 1098 | // This is an error, but it will be diagnosed eventually |
| 1099 | // in do_layout, so we don't need to do anything here but |
| 1100 | // ignore it. |
| 1101 | continue; |
| 1102 | } |
| 1103 | std::string mname(section_names + member_shdr.get_sh_name()); |
| 1104 | |
| 1105 | if (include_group) |
| 1106 | { |
| 1107 | if (is_comdat) |
| 1108 | kept_section->add_comdat_section(mname, shndx, |
| 1109 | member_shdr.get_sh_size()); |
| 1110 | } |
| 1111 | else |
| 1112 | { |
| 1113 | (*omit)[shndx] = true; |
| 1114 | |
| 1115 | if (is_comdat) |
| 1116 | { |
| 1117 | Relobj* kept_object = kept_section->object(); |
| 1118 | if (kept_section->is_comdat()) |
| 1119 | { |
| 1120 | // Find the corresponding kept section, and store |
| 1121 | // that info in the discarded section table. |
| 1122 | unsigned int kept_shndx; |
| 1123 | uint64_t kept_size; |
| 1124 | if (kept_section->find_comdat_section(mname, &kept_shndx, |
| 1125 | &kept_size)) |
| 1126 | { |
| 1127 | // We don't keep a mapping for this section if |
| 1128 | // it has a different size. The mapping is only |
| 1129 | // used for relocation processing, and we don't |
| 1130 | // want to treat the sections as similar if the |
| 1131 | // sizes are different. Checking the section |
| 1132 | // size is the approach used by the GNU linker. |
| 1133 | if (kept_size == member_shdr.get_sh_size()) |
| 1134 | this->set_kept_comdat_section(shndx, kept_object, |
| 1135 | kept_shndx); |
| 1136 | } |
| 1137 | } |
| 1138 | else |
| 1139 | { |
| 1140 | // The existing section is a linkonce section. Add |
| 1141 | // a mapping if there is exactly one section in the |
| 1142 | // group (which is true when COUNT == 2) and if it |
| 1143 | // is the same size. |
| 1144 | if (count == 2 |
| 1145 | && (kept_section->linkonce_size() |
| 1146 | == member_shdr.get_sh_size())) |
| 1147 | this->set_kept_comdat_section(shndx, kept_object, |
| 1148 | kept_section->shndx()); |
| 1149 | } |
| 1150 | } |
| 1151 | } |
| 1152 | } |
| 1153 | |
| 1154 | if (relocate_group) |
| 1155 | layout->layout_group(symtab, this, index, name, signature.c_str(), |
| 1156 | shdr, flags, &shndxes); |
| 1157 | |
| 1158 | return include_group; |
| 1159 | } |
| 1160 | |
| 1161 | // Whether to include a linkonce section in the link. NAME is the |
| 1162 | // name of the section and SHDR is the section header. |
| 1163 | |
| 1164 | // Linkonce sections are a GNU extension implemented in the original |
| 1165 | // GNU linker before section groups were defined. The semantics are |
| 1166 | // that we only include one linkonce section with a given name. The |
| 1167 | // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME, |
| 1168 | // where T is the type of section and SYMNAME is the name of a symbol. |
| 1169 | // In an attempt to make linkonce sections interact well with section |
| 1170 | // groups, we try to identify SYMNAME and use it like a section group |
| 1171 | // signature. We want to block section groups with that signature, |
| 1172 | // but not other linkonce sections with that signature. We also use |
| 1173 | // the full name of the linkonce section as a normal section group |
| 1174 | // signature. |
| 1175 | |
| 1176 | template<int size, bool big_endian> |
| 1177 | bool |
| 1178 | Sized_relobj_file<size, big_endian>::include_linkonce_section( |
| 1179 | Layout* layout, |
| 1180 | unsigned int index, |
| 1181 | const char* name, |
| 1182 | const elfcpp::Shdr<size, big_endian>& shdr) |
| 1183 | { |
| 1184 | typename elfcpp::Elf_types<size>::Elf_WXword sh_size = shdr.get_sh_size(); |
| 1185 | // In general the symbol name we want will be the string following |
| 1186 | // the last '.'. However, we have to handle the case of |
| 1187 | // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by |
| 1188 | // some versions of gcc. So we use a heuristic: if the name starts |
| 1189 | // with ".gnu.linkonce.t.", we use everything after that. Otherwise |
| 1190 | // we look for the last '.'. We can't always simply skip |
| 1191 | // ".gnu.linkonce.X", because we have to deal with cases like |
| 1192 | // ".gnu.linkonce.d.rel.ro.local". |
| 1193 | const char* const linkonce_t = ".gnu.linkonce.t."; |
| 1194 | const char* symname; |
| 1195 | if (strncmp(name, linkonce_t, strlen(linkonce_t)) == 0) |
| 1196 | symname = name + strlen(linkonce_t); |
| 1197 | else |
| 1198 | symname = strrchr(name, '.') + 1; |
| 1199 | std::string sig1(symname); |
| 1200 | std::string sig2(name); |
| 1201 | Kept_section* kept1; |
| 1202 | Kept_section* kept2; |
| 1203 | bool include1 = layout->find_or_add_kept_section(sig1, this, index, false, |
| 1204 | false, &kept1); |
| 1205 | bool include2 = layout->find_or_add_kept_section(sig2, this, index, false, |
| 1206 | true, &kept2); |
| 1207 | |
| 1208 | if (!include2) |
| 1209 | { |
| 1210 | // We are not including this section because we already saw the |
| 1211 | // name of the section as a signature. This normally implies |
| 1212 | // that the kept section is another linkonce section. If it is |
| 1213 | // the same size, record it as the section which corresponds to |
| 1214 | // this one. |
| 1215 | if (kept2->object() != NULL |
| 1216 | && !kept2->is_comdat() |
| 1217 | && kept2->linkonce_size() == sh_size) |
| 1218 | this->set_kept_comdat_section(index, kept2->object(), kept2->shndx()); |
| 1219 | } |
| 1220 | else if (!include1) |
| 1221 | { |
| 1222 | // The section is being discarded on the basis of its symbol |
| 1223 | // name. This means that the corresponding kept section was |
| 1224 | // part of a comdat group, and it will be difficult to identify |
| 1225 | // the specific section within that group that corresponds to |
| 1226 | // this linkonce section. We'll handle the simple case where |
| 1227 | // the group has only one member section. Otherwise, it's not |
| 1228 | // worth the effort. |
| 1229 | unsigned int kept_shndx; |
| 1230 | uint64_t kept_size; |
| 1231 | if (kept1->object() != NULL |
| 1232 | && kept1->is_comdat() |
| 1233 | && kept1->find_single_comdat_section(&kept_shndx, &kept_size) |
| 1234 | && kept_size == sh_size) |
| 1235 | this->set_kept_comdat_section(index, kept1->object(), kept_shndx); |
| 1236 | } |
| 1237 | else |
| 1238 | { |
| 1239 | kept1->set_linkonce_size(sh_size); |
| 1240 | kept2->set_linkonce_size(sh_size); |
| 1241 | } |
| 1242 | |
| 1243 | return include1 && include2; |
| 1244 | } |
| 1245 | |
| 1246 | // Layout an input section. |
| 1247 | |
| 1248 | template<int size, bool big_endian> |
| 1249 | inline void |
| 1250 | Sized_relobj_file<size, big_endian>::layout_section( |
| 1251 | Layout* layout, |
| 1252 | unsigned int shndx, |
| 1253 | const char* name, |
| 1254 | const typename This::Shdr& shdr, |
| 1255 | unsigned int sh_type, |
| 1256 | unsigned int reloc_shndx, |
| 1257 | unsigned int reloc_type) |
| 1258 | { |
| 1259 | off_t offset; |
| 1260 | Output_section* os = layout->layout(this, shndx, name, shdr, sh_type, |
| 1261 | reloc_shndx, reloc_type, &offset); |
| 1262 | |
| 1263 | this->output_sections()[shndx] = os; |
| 1264 | if (offset == -1) |
| 1265 | this->section_offsets()[shndx] = invalid_address; |
| 1266 | else |
| 1267 | this->section_offsets()[shndx] = convert_types<Address, off_t>(offset); |
| 1268 | |
| 1269 | // If this section requires special handling, and if there are |
| 1270 | // relocs that apply to it, then we must do the special handling |
| 1271 | // before we apply the relocs. |
| 1272 | if (offset == -1 && reloc_shndx != 0) |
| 1273 | this->set_relocs_must_follow_section_writes(); |
| 1274 | } |
| 1275 | |
| 1276 | // Layout an input .eh_frame section. |
| 1277 | |
| 1278 | template<int size, bool big_endian> |
| 1279 | void |
| 1280 | Sized_relobj_file<size, big_endian>::layout_eh_frame_section( |
| 1281 | Layout* layout, |
| 1282 | const unsigned char* symbols_data, |
| 1283 | section_size_type symbols_size, |
| 1284 | const unsigned char* symbol_names_data, |
| 1285 | section_size_type symbol_names_size, |
| 1286 | unsigned int shndx, |
| 1287 | const typename This::Shdr& shdr, |
| 1288 | unsigned int reloc_shndx, |
| 1289 | unsigned int reloc_type) |
| 1290 | { |
| 1291 | gold_assert(this->has_eh_frame_); |
| 1292 | |
| 1293 | off_t offset; |
| 1294 | Output_section* os = layout->layout_eh_frame(this, |
| 1295 | symbols_data, |
| 1296 | symbols_size, |
| 1297 | symbol_names_data, |
| 1298 | symbol_names_size, |
| 1299 | shndx, |
| 1300 | shdr, |
| 1301 | reloc_shndx, |
| 1302 | reloc_type, |
| 1303 | &offset); |
| 1304 | this->output_sections()[shndx] = os; |
| 1305 | if (os == NULL || offset == -1) |
| 1306 | this->section_offsets()[shndx] = invalid_address; |
| 1307 | else |
| 1308 | this->section_offsets()[shndx] = convert_types<Address, off_t>(offset); |
| 1309 | |
| 1310 | // If this section requires special handling, and if there are |
| 1311 | // relocs that aply to it, then we must do the special handling |
| 1312 | // before we apply the relocs. |
| 1313 | if (os != NULL && offset == -1 && reloc_shndx != 0) |
| 1314 | this->set_relocs_must_follow_section_writes(); |
| 1315 | } |
| 1316 | |
| 1317 | // Lay out the input sections. We walk through the sections and check |
| 1318 | // whether they should be included in the link. If they should, we |
| 1319 | // pass them to the Layout object, which will return an output section |
| 1320 | // and an offset. |
| 1321 | // This function is called twice sometimes, two passes, when mapping |
| 1322 | // of input sections to output sections must be delayed. |
| 1323 | // This is true for the following : |
| 1324 | // * Garbage collection (--gc-sections): Some input sections will be |
| 1325 | // discarded and hence the assignment must wait until the second pass. |
| 1326 | // In the first pass, it is for setting up some sections as roots to |
| 1327 | // a work-list for --gc-sections and to do comdat processing. |
| 1328 | // * Identical Code Folding (--icf=<safe,all>): Some input sections |
| 1329 | // will be folded and hence the assignment must wait. |
| 1330 | // * Using plugins to map some sections to unique segments: Mapping |
| 1331 | // some sections to unique segments requires mapping them to unique |
| 1332 | // output sections too. This can be done via plugins now and this |
| 1333 | // information is not available in the first pass. |
| 1334 | |
| 1335 | template<int size, bool big_endian> |
| 1336 | void |
| 1337 | Sized_relobj_file<size, big_endian>::do_layout(Symbol_table* symtab, |
| 1338 | Layout* layout, |
| 1339 | Read_symbols_data* sd) |
| 1340 | { |
| 1341 | const unsigned int unwind_section_type = |
| 1342 | parameters->target().unwind_section_type(); |
| 1343 | const unsigned int shnum = this->shnum(); |
| 1344 | |
| 1345 | /* Should this function be called twice? */ |
| 1346 | bool is_two_pass = (parameters->options().gc_sections() |
| 1347 | || parameters->options().icf_enabled() |
| 1348 | || layout->is_unique_segment_for_sections_specified()); |
| 1349 | |
| 1350 | /* Only one of is_pass_one and is_pass_two is true. Both are false when |
| 1351 | a two-pass approach is not needed. */ |
| 1352 | bool is_pass_one = false; |
| 1353 | bool is_pass_two = false; |
| 1354 | |
| 1355 | Symbols_data* gc_sd = NULL; |
| 1356 | |
| 1357 | /* Check if do_layout needs to be two-pass. If so, find out which pass |
| 1358 | should happen. In the first pass, the data in sd is saved to be used |
| 1359 | later in the second pass. */ |
| 1360 | if (is_two_pass) |
| 1361 | { |
| 1362 | gc_sd = this->get_symbols_data(); |
| 1363 | if (gc_sd == NULL) |
| 1364 | { |
| 1365 | gold_assert(sd != NULL); |
| 1366 | is_pass_one = true; |
| 1367 | } |
| 1368 | else |
| 1369 | { |
| 1370 | if (parameters->options().gc_sections()) |
| 1371 | gold_assert(symtab->gc()->is_worklist_ready()); |
| 1372 | if (parameters->options().icf_enabled()) |
| 1373 | gold_assert(symtab->icf()->is_icf_ready()); |
| 1374 | is_pass_two = true; |
| 1375 | } |
| 1376 | } |
| 1377 | |
| 1378 | if (shnum == 0) |
| 1379 | return; |
| 1380 | |
| 1381 | if (is_pass_one) |
| 1382 | { |
| 1383 | // During garbage collection save the symbols data to use it when |
| 1384 | // re-entering this function. |
| 1385 | gc_sd = new Symbols_data; |
| 1386 | this->copy_symbols_data(gc_sd, sd, This::shdr_size * shnum); |
| 1387 | this->set_symbols_data(gc_sd); |
| 1388 | } |
| 1389 | |
| 1390 | const unsigned char* section_headers_data = NULL; |
| 1391 | section_size_type section_names_size; |
| 1392 | const unsigned char* symbols_data = NULL; |
| 1393 | section_size_type symbols_size; |
| 1394 | const unsigned char* symbol_names_data = NULL; |
| 1395 | section_size_type symbol_names_size; |
| 1396 | |
| 1397 | if (is_two_pass) |
| 1398 | { |
| 1399 | section_headers_data = gc_sd->section_headers_data; |
| 1400 | section_names_size = gc_sd->section_names_size; |
| 1401 | symbols_data = gc_sd->symbols_data; |
| 1402 | symbols_size = gc_sd->symbols_size; |
| 1403 | symbol_names_data = gc_sd->symbol_names_data; |
| 1404 | symbol_names_size = gc_sd->symbol_names_size; |
| 1405 | } |
| 1406 | else |
| 1407 | { |
| 1408 | section_headers_data = sd->section_headers->data(); |
| 1409 | section_names_size = sd->section_names_size; |
| 1410 | if (sd->symbols != NULL) |
| 1411 | symbols_data = sd->symbols->data(); |
| 1412 | symbols_size = sd->symbols_size; |
| 1413 | if (sd->symbol_names != NULL) |
| 1414 | symbol_names_data = sd->symbol_names->data(); |
| 1415 | symbol_names_size = sd->symbol_names_size; |
| 1416 | } |
| 1417 | |
| 1418 | // Get the section headers. |
| 1419 | const unsigned char* shdrs = section_headers_data; |
| 1420 | const unsigned char* pshdrs; |
| 1421 | |
| 1422 | // Get the section names. |
| 1423 | const unsigned char* pnamesu = (is_two_pass |
| 1424 | ? gc_sd->section_names_data |
| 1425 | : sd->section_names->data()); |
| 1426 | |
| 1427 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
| 1428 | |
| 1429 | // If any input files have been claimed by plugins, we need to defer |
| 1430 | // actual layout until the replacement files have arrived. |
| 1431 | const bool should_defer_layout = |
| 1432 | (parameters->options().has_plugins() |
| 1433 | && parameters->options().plugins()->should_defer_layout()); |
| 1434 | unsigned int num_sections_to_defer = 0; |
| 1435 | |
| 1436 | // For each section, record the index of the reloc section if any. |
| 1437 | // Use 0 to mean that there is no reloc section, -1U to mean that |
| 1438 | // there is more than one. |
| 1439 | std::vector<unsigned int> reloc_shndx(shnum, 0); |
| 1440 | std::vector<unsigned int> reloc_type(shnum, elfcpp::SHT_NULL); |
| 1441 | // Skip the first, dummy, section. |
| 1442 | pshdrs = shdrs + This::shdr_size; |
| 1443 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
| 1444 | { |
| 1445 | typename This::Shdr shdr(pshdrs); |
| 1446 | |
| 1447 | // Count the number of sections whose layout will be deferred. |
| 1448 | if (should_defer_layout && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) |
| 1449 | ++num_sections_to_defer; |
| 1450 | |
| 1451 | unsigned int sh_type = shdr.get_sh_type(); |
| 1452 | if (sh_type == elfcpp::SHT_REL || sh_type == elfcpp::SHT_RELA) |
| 1453 | { |
| 1454 | unsigned int target_shndx = this->adjust_shndx(shdr.get_sh_info()); |
| 1455 | if (target_shndx == 0 || target_shndx >= shnum) |
| 1456 | { |
| 1457 | this->error(_("relocation section %u has bad info %u"), |
| 1458 | i, target_shndx); |
| 1459 | continue; |
| 1460 | } |
| 1461 | |
| 1462 | if (reloc_shndx[target_shndx] != 0) |
| 1463 | reloc_shndx[target_shndx] = -1U; |
| 1464 | else |
| 1465 | { |
| 1466 | reloc_shndx[target_shndx] = i; |
| 1467 | reloc_type[target_shndx] = sh_type; |
| 1468 | } |
| 1469 | } |
| 1470 | } |
| 1471 | |
| 1472 | Output_sections& out_sections(this->output_sections()); |
| 1473 | std::vector<Address>& out_section_offsets(this->section_offsets()); |
| 1474 | |
| 1475 | if (!is_pass_two) |
| 1476 | { |
| 1477 | out_sections.resize(shnum); |
| 1478 | out_section_offsets.resize(shnum); |
| 1479 | } |
| 1480 | |
| 1481 | // If we are only linking for symbols, then there is nothing else to |
| 1482 | // do here. |
| 1483 | if (this->input_file()->just_symbols()) |
| 1484 | { |
| 1485 | if (!is_pass_two) |
| 1486 | { |
| 1487 | delete sd->section_headers; |
| 1488 | sd->section_headers = NULL; |
| 1489 | delete sd->section_names; |
| 1490 | sd->section_names = NULL; |
| 1491 | } |
| 1492 | return; |
| 1493 | } |
| 1494 | |
| 1495 | if (num_sections_to_defer > 0) |
| 1496 | { |
| 1497 | parameters->options().plugins()->add_deferred_layout_object(this); |
| 1498 | this->deferred_layout_.reserve(num_sections_to_defer); |
| 1499 | this->is_deferred_layout_ = true; |
| 1500 | } |
| 1501 | |
| 1502 | // Whether we've seen a .note.GNU-stack section. |
| 1503 | bool seen_gnu_stack = false; |
| 1504 | // The flags of a .note.GNU-stack section. |
| 1505 | uint64_t gnu_stack_flags = 0; |
| 1506 | |
| 1507 | // Keep track of which sections to omit. |
| 1508 | std::vector<bool> omit(shnum, false); |
| 1509 | |
| 1510 | // Keep track of reloc sections when emitting relocations. |
| 1511 | const bool relocatable = parameters->options().relocatable(); |
| 1512 | const bool emit_relocs = (relocatable |
| 1513 | || parameters->options().emit_relocs()); |
| 1514 | std::vector<unsigned int> reloc_sections; |
| 1515 | |
| 1516 | // Keep track of .eh_frame sections. |
| 1517 | std::vector<unsigned int> eh_frame_sections; |
| 1518 | |
| 1519 | // Keep track of .debug_info and .debug_types sections. |
| 1520 | std::vector<unsigned int> debug_info_sections; |
| 1521 | std::vector<unsigned int> debug_types_sections; |
| 1522 | |
| 1523 | // Skip the first, dummy, section. |
| 1524 | pshdrs = shdrs + This::shdr_size; |
| 1525 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
| 1526 | { |
| 1527 | typename This::Shdr shdr(pshdrs); |
| 1528 | const unsigned int sh_name = shdr.get_sh_name(); |
| 1529 | unsigned int sh_type = shdr.get_sh_type(); |
| 1530 | |
| 1531 | if (sh_name >= section_names_size) |
| 1532 | { |
| 1533 | this->error(_("bad section name offset for section %u: %lu"), |
| 1534 | i, static_cast<unsigned long>(sh_name)); |
| 1535 | return; |
| 1536 | } |
| 1537 | |
| 1538 | const char* name = pnames + sh_name; |
| 1539 | |
| 1540 | if (!is_pass_two) |
| 1541 | { |
| 1542 | if (this->handle_gnu_warning_section(name, i, symtab)) |
| 1543 | { |
| 1544 | if (!relocatable && !parameters->options().shared()) |
| 1545 | omit[i] = true; |
| 1546 | } |
| 1547 | |
| 1548 | // The .note.GNU-stack section is special. It gives the |
| 1549 | // protection flags that this object file requires for the stack |
| 1550 | // in memory. |
| 1551 | if (strcmp(name, ".note.GNU-stack") == 0) |
| 1552 | { |
| 1553 | seen_gnu_stack = true; |
| 1554 | gnu_stack_flags |= shdr.get_sh_flags(); |
| 1555 | omit[i] = true; |
| 1556 | } |
| 1557 | |
| 1558 | // The .note.GNU-split-stack section is also special. It |
| 1559 | // indicates that the object was compiled with |
| 1560 | // -fsplit-stack. |
| 1561 | if (this->handle_split_stack_section(name)) |
| 1562 | { |
| 1563 | if (!relocatable && !parameters->options().shared()) |
| 1564 | omit[i] = true; |
| 1565 | } |
| 1566 | |
| 1567 | // Skip attributes section. |
| 1568 | if (parameters->target().is_attributes_section(name)) |
| 1569 | { |
| 1570 | omit[i] = true; |
| 1571 | } |
| 1572 | |
| 1573 | bool discard = omit[i]; |
| 1574 | if (!discard) |
| 1575 | { |
| 1576 | if (sh_type == elfcpp::SHT_GROUP) |
| 1577 | { |
| 1578 | if (!this->include_section_group(symtab, layout, i, name, |
| 1579 | shdrs, pnames, |
| 1580 | section_names_size, |
| 1581 | &omit)) |
| 1582 | discard = true; |
| 1583 | } |
| 1584 | else if ((shdr.get_sh_flags() & elfcpp::SHF_GROUP) == 0 |
| 1585 | && Layout::is_linkonce(name)) |
| 1586 | { |
| 1587 | if (!this->include_linkonce_section(layout, i, name, shdr)) |
| 1588 | discard = true; |
| 1589 | } |
| 1590 | } |
| 1591 | |
| 1592 | // Add the section to the incremental inputs layout. |
| 1593 | Incremental_inputs* incremental_inputs = layout->incremental_inputs(); |
| 1594 | if (incremental_inputs != NULL |
| 1595 | && !discard |
| 1596 | && can_incremental_update(sh_type)) |
| 1597 | { |
| 1598 | off_t sh_size = shdr.get_sh_size(); |
| 1599 | section_size_type uncompressed_size; |
| 1600 | if (this->section_is_compressed(i, &uncompressed_size)) |
| 1601 | sh_size = uncompressed_size; |
| 1602 | incremental_inputs->report_input_section(this, i, name, sh_size); |
| 1603 | } |
| 1604 | |
| 1605 | if (discard) |
| 1606 | { |
| 1607 | // Do not include this section in the link. |
| 1608 | out_sections[i] = NULL; |
| 1609 | out_section_offsets[i] = invalid_address; |
| 1610 | continue; |
| 1611 | } |
| 1612 | } |
| 1613 | |
| 1614 | if (is_pass_one && parameters->options().gc_sections()) |
| 1615 | { |
| 1616 | if (this->is_section_name_included(name) |
| 1617 | || layout->keep_input_section (this, name) |
| 1618 | || sh_type == elfcpp::SHT_INIT_ARRAY |
| 1619 | || sh_type == elfcpp::SHT_FINI_ARRAY) |
| 1620 | { |
| 1621 | symtab->gc()->worklist().push_back(Section_id(this, i)); |
| 1622 | } |
| 1623 | // If the section name XXX can be represented as a C identifier |
| 1624 | // it cannot be discarded if there are references to |
| 1625 | // __start_XXX and __stop_XXX symbols. These need to be |
| 1626 | // specially handled. |
| 1627 | if (is_cident(name)) |
| 1628 | { |
| 1629 | symtab->gc()->add_cident_section(name, Section_id(this, i)); |
| 1630 | } |
| 1631 | } |
| 1632 | |
| 1633 | // When doing a relocatable link we are going to copy input |
| 1634 | // reloc sections into the output. We only want to copy the |
| 1635 | // ones associated with sections which are not being discarded. |
| 1636 | // However, we don't know that yet for all sections. So save |
| 1637 | // reloc sections and process them later. Garbage collection is |
| 1638 | // not triggered when relocatable code is desired. |
| 1639 | if (emit_relocs |
| 1640 | && (sh_type == elfcpp::SHT_REL |
| 1641 | || sh_type == elfcpp::SHT_RELA)) |
| 1642 | { |
| 1643 | reloc_sections.push_back(i); |
| 1644 | continue; |
| 1645 | } |
| 1646 | |
| 1647 | if (relocatable && sh_type == elfcpp::SHT_GROUP) |
| 1648 | continue; |
| 1649 | |
| 1650 | // The .eh_frame section is special. It holds exception frame |
| 1651 | // information that we need to read in order to generate the |
| 1652 | // exception frame header. We process these after all the other |
| 1653 | // sections so that the exception frame reader can reliably |
| 1654 | // determine which sections are being discarded, and discard the |
| 1655 | // corresponding information. |
| 1656 | if (this->check_eh_frame_flags(&shdr) |
| 1657 | && strcmp(name, ".eh_frame") == 0) |
| 1658 | { |
| 1659 | // If the target has a special unwind section type, let's |
| 1660 | // canonicalize it here. |
| 1661 | sh_type = unwind_section_type; |
| 1662 | if (!relocatable) |
| 1663 | { |
| 1664 | if (is_pass_one) |
| 1665 | { |
| 1666 | if (this->is_deferred_layout()) |
| 1667 | out_sections[i] = reinterpret_cast<Output_section*>(2); |
| 1668 | else |
| 1669 | out_sections[i] = reinterpret_cast<Output_section*>(1); |
| 1670 | out_section_offsets[i] = invalid_address; |
| 1671 | } |
| 1672 | else if (this->is_deferred_layout()) |
| 1673 | this->deferred_layout_.push_back( |
| 1674 | Deferred_layout(i, name, sh_type, pshdrs, |
| 1675 | reloc_shndx[i], reloc_type[i])); |
| 1676 | else |
| 1677 | eh_frame_sections.push_back(i); |
| 1678 | continue; |
| 1679 | } |
| 1680 | } |
| 1681 | |
| 1682 | if (is_pass_two && parameters->options().gc_sections()) |
| 1683 | { |
| 1684 | // This is executed during the second pass of garbage |
| 1685 | // collection. do_layout has been called before and some |
| 1686 | // sections have been already discarded. Simply ignore |
| 1687 | // such sections this time around. |
| 1688 | if (out_sections[i] == NULL) |
| 1689 | { |
| 1690 | gold_assert(out_section_offsets[i] == invalid_address); |
| 1691 | continue; |
| 1692 | } |
| 1693 | if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0) |
| 1694 | && symtab->gc()->is_section_garbage(this, i)) |
| 1695 | { |
| 1696 | if (parameters->options().print_gc_sections()) |
| 1697 | gold_info(_("%s: removing unused section from '%s'" |
| 1698 | " in file '%s'"), |
| 1699 | program_name, this->section_name(i).c_str(), |
| 1700 | this->name().c_str()); |
| 1701 | out_sections[i] = NULL; |
| 1702 | out_section_offsets[i] = invalid_address; |
| 1703 | continue; |
| 1704 | } |
| 1705 | } |
| 1706 | |
| 1707 | if (is_pass_two && parameters->options().icf_enabled()) |
| 1708 | { |
| 1709 | if (out_sections[i] == NULL) |
| 1710 | { |
| 1711 | gold_assert(out_section_offsets[i] == invalid_address); |
| 1712 | continue; |
| 1713 | } |
| 1714 | if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0) |
| 1715 | && symtab->icf()->is_section_folded(this, i)) |
| 1716 | { |
| 1717 | if (parameters->options().print_icf_sections()) |
| 1718 | { |
| 1719 | Section_id folded = |
| 1720 | symtab->icf()->get_folded_section(this, i); |
| 1721 | Relobj* folded_obj = |
| 1722 | reinterpret_cast<Relobj*>(folded.first); |
| 1723 | gold_info(_("%s: ICF folding section '%s' in file '%s' " |
| 1724 | "into '%s' in file '%s'"), |
| 1725 | program_name, this->section_name(i).c_str(), |
| 1726 | this->name().c_str(), |
| 1727 | folded_obj->section_name(folded.second).c_str(), |
| 1728 | folded_obj->name().c_str()); |
| 1729 | } |
| 1730 | out_sections[i] = NULL; |
| 1731 | out_section_offsets[i] = invalid_address; |
| 1732 | continue; |
| 1733 | } |
| 1734 | } |
| 1735 | |
| 1736 | // Defer layout here if input files are claimed by plugins. When gc |
| 1737 | // is turned on this function is called twice; we only want to do this |
| 1738 | // on the first pass. |
| 1739 | if (!is_pass_two |
| 1740 | && this->is_deferred_layout() |
| 1741 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) |
| 1742 | { |
| 1743 | this->deferred_layout_.push_back(Deferred_layout(i, name, sh_type, |
| 1744 | pshdrs, |
| 1745 | reloc_shndx[i], |
| 1746 | reloc_type[i])); |
| 1747 | // Put dummy values here; real values will be supplied by |
| 1748 | // do_layout_deferred_sections. |
| 1749 | out_sections[i] = reinterpret_cast<Output_section*>(2); |
| 1750 | out_section_offsets[i] = invalid_address; |
| 1751 | continue; |
| 1752 | } |
| 1753 | |
| 1754 | // During gc_pass_two if a section that was previously deferred is |
| 1755 | // found, do not layout the section as layout_deferred_sections will |
| 1756 | // do it later from gold.cc. |
| 1757 | if (is_pass_two |
| 1758 | && (out_sections[i] == reinterpret_cast<Output_section*>(2))) |
| 1759 | continue; |
| 1760 | |
| 1761 | if (is_pass_one) |
| 1762 | { |
| 1763 | // This is during garbage collection. The out_sections are |
| 1764 | // assigned in the second call to this function. |
| 1765 | out_sections[i] = reinterpret_cast<Output_section*>(1); |
| 1766 | out_section_offsets[i] = invalid_address; |
| 1767 | } |
| 1768 | else |
| 1769 | { |
| 1770 | // When garbage collection is switched on the actual layout |
| 1771 | // only happens in the second call. |
| 1772 | this->layout_section(layout, i, name, shdr, sh_type, reloc_shndx[i], |
| 1773 | reloc_type[i]); |
| 1774 | |
| 1775 | // When generating a .gdb_index section, we do additional |
| 1776 | // processing of .debug_info and .debug_types sections after all |
| 1777 | // the other sections for the same reason as above. |
| 1778 | if (!relocatable |
| 1779 | && parameters->options().gdb_index() |
| 1780 | && !(shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) |
| 1781 | { |
| 1782 | if (strcmp(name, ".debug_info") == 0 |
| 1783 | || strcmp(name, ".zdebug_info") == 0) |
| 1784 | debug_info_sections.push_back(i); |
| 1785 | else if (strcmp(name, ".debug_types") == 0 |
| 1786 | || strcmp(name, ".zdebug_types") == 0) |
| 1787 | debug_types_sections.push_back(i); |
| 1788 | } |
| 1789 | } |
| 1790 | } |
| 1791 | |
| 1792 | if (!is_pass_two) |
| 1793 | layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags, this); |
| 1794 | |
| 1795 | // Handle the .eh_frame sections after the other sections. |
| 1796 | gold_assert(!is_pass_one || eh_frame_sections.empty()); |
| 1797 | for (std::vector<unsigned int>::const_iterator p = eh_frame_sections.begin(); |
| 1798 | p != eh_frame_sections.end(); |
| 1799 | ++p) |
| 1800 | { |
| 1801 | unsigned int i = *p; |
| 1802 | const unsigned char* pshdr; |
| 1803 | pshdr = section_headers_data + i * This::shdr_size; |
| 1804 | typename This::Shdr shdr(pshdr); |
| 1805 | |
| 1806 | this->layout_eh_frame_section(layout, |
| 1807 | symbols_data, |
| 1808 | symbols_size, |
| 1809 | symbol_names_data, |
| 1810 | symbol_names_size, |
| 1811 | i, |
| 1812 | shdr, |
| 1813 | reloc_shndx[i], |
| 1814 | reloc_type[i]); |
| 1815 | } |
| 1816 | |
| 1817 | // When doing a relocatable link handle the reloc sections at the |
| 1818 | // end. Garbage collection and Identical Code Folding is not |
| 1819 | // turned on for relocatable code. |
| 1820 | if (emit_relocs) |
| 1821 | this->size_relocatable_relocs(); |
| 1822 | |
| 1823 | gold_assert(!is_two_pass || reloc_sections.empty()); |
| 1824 | |
| 1825 | for (std::vector<unsigned int>::const_iterator p = reloc_sections.begin(); |
| 1826 | p != reloc_sections.end(); |
| 1827 | ++p) |
| 1828 | { |
| 1829 | unsigned int i = *p; |
| 1830 | const unsigned char* pshdr; |
| 1831 | pshdr = section_headers_data + i * This::shdr_size; |
| 1832 | typename This::Shdr shdr(pshdr); |
| 1833 | |
| 1834 | unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info()); |
| 1835 | if (data_shndx >= shnum) |
| 1836 | { |
| 1837 | // We already warned about this above. |
| 1838 | continue; |
| 1839 | } |
| 1840 | |
| 1841 | Output_section* data_section = out_sections[data_shndx]; |
| 1842 | if (data_section == reinterpret_cast<Output_section*>(2)) |
| 1843 | { |
| 1844 | if (is_pass_two) |
| 1845 | continue; |
| 1846 | // The layout for the data section was deferred, so we need |
| 1847 | // to defer the relocation section, too. |
| 1848 | const char* name = pnames + shdr.get_sh_name(); |
| 1849 | this->deferred_layout_relocs_.push_back( |
| 1850 | Deferred_layout(i, name, shdr.get_sh_type(), pshdr, 0, |
| 1851 | elfcpp::SHT_NULL)); |
| 1852 | out_sections[i] = reinterpret_cast<Output_section*>(2); |
| 1853 | out_section_offsets[i] = invalid_address; |
| 1854 | continue; |
| 1855 | } |
| 1856 | if (data_section == NULL) |
| 1857 | { |
| 1858 | out_sections[i] = NULL; |
| 1859 | out_section_offsets[i] = invalid_address; |
| 1860 | continue; |
| 1861 | } |
| 1862 | |
| 1863 | Relocatable_relocs* rr = new Relocatable_relocs(); |
| 1864 | this->set_relocatable_relocs(i, rr); |
| 1865 | |
| 1866 | Output_section* os = layout->layout_reloc(this, i, shdr, data_section, |
| 1867 | rr); |
| 1868 | out_sections[i] = os; |
| 1869 | out_section_offsets[i] = invalid_address; |
| 1870 | } |
| 1871 | |
| 1872 | // When building a .gdb_index section, scan the .debug_info and |
| 1873 | // .debug_types sections. |
| 1874 | gold_assert(!is_pass_one |
| 1875 | || (debug_info_sections.empty() && debug_types_sections.empty())); |
| 1876 | for (std::vector<unsigned int>::const_iterator p |
| 1877 | = debug_info_sections.begin(); |
| 1878 | p != debug_info_sections.end(); |
| 1879 | ++p) |
| 1880 | { |
| 1881 | unsigned int i = *p; |
| 1882 | layout->add_to_gdb_index(false, this, symbols_data, symbols_size, |
| 1883 | i, reloc_shndx[i], reloc_type[i]); |
| 1884 | } |
| 1885 | for (std::vector<unsigned int>::const_iterator p |
| 1886 | = debug_types_sections.begin(); |
| 1887 | p != debug_types_sections.end(); |
| 1888 | ++p) |
| 1889 | { |
| 1890 | unsigned int i = *p; |
| 1891 | layout->add_to_gdb_index(true, this, symbols_data, symbols_size, |
| 1892 | i, reloc_shndx[i], reloc_type[i]); |
| 1893 | } |
| 1894 | |
| 1895 | if (is_pass_two) |
| 1896 | { |
| 1897 | delete[] gc_sd->section_headers_data; |
| 1898 | delete[] gc_sd->section_names_data; |
| 1899 | delete[] gc_sd->symbols_data; |
| 1900 | delete[] gc_sd->symbol_names_data; |
| 1901 | this->set_symbols_data(NULL); |
| 1902 | } |
| 1903 | else |
| 1904 | { |
| 1905 | delete sd->section_headers; |
| 1906 | sd->section_headers = NULL; |
| 1907 | delete sd->section_names; |
| 1908 | sd->section_names = NULL; |
| 1909 | } |
| 1910 | } |
| 1911 | |
| 1912 | // Layout sections whose layout was deferred while waiting for |
| 1913 | // input files from a plugin. |
| 1914 | |
| 1915 | template<int size, bool big_endian> |
| 1916 | void |
| 1917 | Sized_relobj_file<size, big_endian>::do_layout_deferred_sections(Layout* layout) |
| 1918 | { |
| 1919 | typename std::vector<Deferred_layout>::iterator deferred; |
| 1920 | |
| 1921 | for (deferred = this->deferred_layout_.begin(); |
| 1922 | deferred != this->deferred_layout_.end(); |
| 1923 | ++deferred) |
| 1924 | { |
| 1925 | typename This::Shdr shdr(deferred->shdr_data_); |
| 1926 | |
| 1927 | if (!parameters->options().relocatable() |
| 1928 | && deferred->name_ == ".eh_frame" |
| 1929 | && this->check_eh_frame_flags(&shdr)) |
| 1930 | { |
| 1931 | // Checking is_section_included is not reliable for |
| 1932 | // .eh_frame sections, because they do not have an output |
| 1933 | // section. This is not a problem normally because we call |
| 1934 | // layout_eh_frame_section unconditionally, but when |
| 1935 | // deferring sections that is not true. We don't want to |
| 1936 | // keep all .eh_frame sections because that will cause us to |
| 1937 | // keep all sections that they refer to, which is the wrong |
| 1938 | // way around. Instead, the eh_frame code will discard |
| 1939 | // .eh_frame sections that refer to discarded sections. |
| 1940 | |
| 1941 | // Reading the symbols again here may be slow. |
| 1942 | Read_symbols_data sd; |
| 1943 | this->base_read_symbols(&sd); |
| 1944 | this->layout_eh_frame_section(layout, |
| 1945 | sd.symbols->data(), |
| 1946 | sd.symbols_size, |
| 1947 | sd.symbol_names->data(), |
| 1948 | sd.symbol_names_size, |
| 1949 | deferred->shndx_, |
| 1950 | shdr, |
| 1951 | deferred->reloc_shndx_, |
| 1952 | deferred->reloc_type_); |
| 1953 | continue; |
| 1954 | } |
| 1955 | |
| 1956 | // If the section is not included, it is because the garbage collector |
| 1957 | // decided it is not needed. Avoid reverting that decision. |
| 1958 | if (!this->is_section_included(deferred->shndx_)) |
| 1959 | continue; |
| 1960 | |
| 1961 | this->layout_section(layout, deferred->shndx_, deferred->name_.c_str(), |
| 1962 | shdr, shdr.get_sh_type(), deferred->reloc_shndx_, |
| 1963 | deferred->reloc_type_); |
| 1964 | } |
| 1965 | |
| 1966 | this->deferred_layout_.clear(); |
| 1967 | |
| 1968 | // Now handle the deferred relocation sections. |
| 1969 | |
| 1970 | Output_sections& out_sections(this->output_sections()); |
| 1971 | std::vector<Address>& out_section_offsets(this->section_offsets()); |
| 1972 | |
| 1973 | for (deferred = this->deferred_layout_relocs_.begin(); |
| 1974 | deferred != this->deferred_layout_relocs_.end(); |
| 1975 | ++deferred) |
| 1976 | { |
| 1977 | unsigned int shndx = deferred->shndx_; |
| 1978 | typename This::Shdr shdr(deferred->shdr_data_); |
| 1979 | unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info()); |
| 1980 | |
| 1981 | Output_section* data_section = out_sections[data_shndx]; |
| 1982 | if (data_section == NULL) |
| 1983 | { |
| 1984 | out_sections[shndx] = NULL; |
| 1985 | out_section_offsets[shndx] = invalid_address; |
| 1986 | continue; |
| 1987 | } |
| 1988 | |
| 1989 | Relocatable_relocs* rr = new Relocatable_relocs(); |
| 1990 | this->set_relocatable_relocs(shndx, rr); |
| 1991 | |
| 1992 | Output_section* os = layout->layout_reloc(this, shndx, shdr, |
| 1993 | data_section, rr); |
| 1994 | out_sections[shndx] = os; |
| 1995 | out_section_offsets[shndx] = invalid_address; |
| 1996 | } |
| 1997 | } |
| 1998 | |
| 1999 | // Add the symbols to the symbol table. |
| 2000 | |
| 2001 | template<int size, bool big_endian> |
| 2002 | void |
| 2003 | Sized_relobj_file<size, big_endian>::do_add_symbols(Symbol_table* symtab, |
| 2004 | Read_symbols_data* sd, |
| 2005 | Layout*) |
| 2006 | { |
| 2007 | if (sd->symbols == NULL) |
| 2008 | { |
| 2009 | gold_assert(sd->symbol_names == NULL); |
| 2010 | return; |
| 2011 | } |
| 2012 | |
| 2013 | const int sym_size = This::sym_size; |
| 2014 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) |
| 2015 | / sym_size); |
| 2016 | if (symcount * sym_size != sd->symbols_size - sd->external_symbols_offset) |
| 2017 | { |
| 2018 | this->error(_("size of symbols is not multiple of symbol size")); |
| 2019 | return; |
| 2020 | } |
| 2021 | |
| 2022 | this->symbols_.resize(symcount); |
| 2023 | |
| 2024 | const char* sym_names = |
| 2025 | reinterpret_cast<const char*>(sd->symbol_names->data()); |
| 2026 | symtab->add_from_relobj(this, |
| 2027 | sd->symbols->data() + sd->external_symbols_offset, |
| 2028 | symcount, this->local_symbol_count_, |
| 2029 | sym_names, sd->symbol_names_size, |
| 2030 | &this->symbols_, |
| 2031 | &this->defined_count_); |
| 2032 | |
| 2033 | delete sd->symbols; |
| 2034 | sd->symbols = NULL; |
| 2035 | delete sd->symbol_names; |
| 2036 | sd->symbol_names = NULL; |
| 2037 | } |
| 2038 | |
| 2039 | // Find out if this object, that is a member of a lib group, should be included |
| 2040 | // in the link. We check every symbol defined by this object. If the symbol |
| 2041 | // table has a strong undefined reference to that symbol, we have to include |
| 2042 | // the object. |
| 2043 | |
| 2044 | template<int size, bool big_endian> |
| 2045 | Archive::Should_include |
| 2046 | Sized_relobj_file<size, big_endian>::do_should_include_member( |
| 2047 | Symbol_table* symtab, |
| 2048 | Layout* layout, |
| 2049 | Read_symbols_data* sd, |
| 2050 | std::string* why) |
| 2051 | { |
| 2052 | char* tmpbuf = NULL; |
| 2053 | size_t tmpbuflen = 0; |
| 2054 | const char* sym_names = |
| 2055 | reinterpret_cast<const char*>(sd->symbol_names->data()); |
| 2056 | const unsigned char* syms = |
| 2057 | sd->symbols->data() + sd->external_symbols_offset; |
| 2058 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 2059 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) |
| 2060 | / sym_size); |
| 2061 | |
| 2062 | const unsigned char* p = syms; |
| 2063 | |
| 2064 | for (size_t i = 0; i < symcount; ++i, p += sym_size) |
| 2065 | { |
| 2066 | elfcpp::Sym<size, big_endian> sym(p); |
| 2067 | unsigned int st_shndx = sym.get_st_shndx(); |
| 2068 | if (st_shndx == elfcpp::SHN_UNDEF) |
| 2069 | continue; |
| 2070 | |
| 2071 | unsigned int st_name = sym.get_st_name(); |
| 2072 | const char* name = sym_names + st_name; |
| 2073 | Symbol* symbol; |
| 2074 | Archive::Should_include t = Archive::should_include_member(symtab, |
| 2075 | layout, |
| 2076 | name, |
| 2077 | &symbol, why, |
| 2078 | &tmpbuf, |
| 2079 | &tmpbuflen); |
| 2080 | if (t == Archive::SHOULD_INCLUDE_YES) |
| 2081 | { |
| 2082 | if (tmpbuf != NULL) |
| 2083 | free(tmpbuf); |
| 2084 | return t; |
| 2085 | } |
| 2086 | } |
| 2087 | if (tmpbuf != NULL) |
| 2088 | free(tmpbuf); |
| 2089 | return Archive::SHOULD_INCLUDE_UNKNOWN; |
| 2090 | } |
| 2091 | |
| 2092 | // Iterate over global defined symbols, calling a visitor class V for each. |
| 2093 | |
| 2094 | template<int size, bool big_endian> |
| 2095 | void |
| 2096 | Sized_relobj_file<size, big_endian>::do_for_all_global_symbols( |
| 2097 | Read_symbols_data* sd, |
| 2098 | Library_base::Symbol_visitor_base* v) |
| 2099 | { |
| 2100 | const char* sym_names = |
| 2101 | reinterpret_cast<const char*>(sd->symbol_names->data()); |
| 2102 | const unsigned char* syms = |
| 2103 | sd->symbols->data() + sd->external_symbols_offset; |
| 2104 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 2105 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) |
| 2106 | / sym_size); |
| 2107 | const unsigned char* p = syms; |
| 2108 | |
| 2109 | for (size_t i = 0; i < symcount; ++i, p += sym_size) |
| 2110 | { |
| 2111 | elfcpp::Sym<size, big_endian> sym(p); |
| 2112 | if (sym.get_st_shndx() != elfcpp::SHN_UNDEF) |
| 2113 | v->visit(sym_names + sym.get_st_name()); |
| 2114 | } |
| 2115 | } |
| 2116 | |
| 2117 | // Return whether the local symbol SYMNDX has a PLT offset. |
| 2118 | |
| 2119 | template<int size, bool big_endian> |
| 2120 | bool |
| 2121 | Sized_relobj_file<size, big_endian>::local_has_plt_offset( |
| 2122 | unsigned int symndx) const |
| 2123 | { |
| 2124 | typename Local_plt_offsets::const_iterator p = |
| 2125 | this->local_plt_offsets_.find(symndx); |
| 2126 | return p != this->local_plt_offsets_.end(); |
| 2127 | } |
| 2128 | |
| 2129 | // Get the PLT offset of a local symbol. |
| 2130 | |
| 2131 | template<int size, bool big_endian> |
| 2132 | unsigned int |
| 2133 | Sized_relobj_file<size, big_endian>::do_local_plt_offset( |
| 2134 | unsigned int symndx) const |
| 2135 | { |
| 2136 | typename Local_plt_offsets::const_iterator p = |
| 2137 | this->local_plt_offsets_.find(symndx); |
| 2138 | gold_assert(p != this->local_plt_offsets_.end()); |
| 2139 | return p->second; |
| 2140 | } |
| 2141 | |
| 2142 | // Set the PLT offset of a local symbol. |
| 2143 | |
| 2144 | template<int size, bool big_endian> |
| 2145 | void |
| 2146 | Sized_relobj_file<size, big_endian>::set_local_plt_offset( |
| 2147 | unsigned int symndx, unsigned int plt_offset) |
| 2148 | { |
| 2149 | std::pair<typename Local_plt_offsets::iterator, bool> ins = |
| 2150 | this->local_plt_offsets_.insert(std::make_pair(symndx, plt_offset)); |
| 2151 | gold_assert(ins.second); |
| 2152 | } |
| 2153 | |
| 2154 | // First pass over the local symbols. Here we add their names to |
| 2155 | // *POOL and *DYNPOOL, and we store the symbol value in |
| 2156 | // THIS->LOCAL_VALUES_. This function is always called from a |
| 2157 | // singleton thread. This is followed by a call to |
| 2158 | // finalize_local_symbols. |
| 2159 | |
| 2160 | template<int size, bool big_endian> |
| 2161 | void |
| 2162 | Sized_relobj_file<size, big_endian>::do_count_local_symbols(Stringpool* pool, |
| 2163 | Stringpool* dynpool) |
| 2164 | { |
| 2165 | gold_assert(this->symtab_shndx_ != -1U); |
| 2166 | if (this->symtab_shndx_ == 0) |
| 2167 | { |
| 2168 | // This object has no symbols. Weird but legal. |
| 2169 | return; |
| 2170 | } |
| 2171 | |
| 2172 | // Read the symbol table section header. |
| 2173 | const unsigned int symtab_shndx = this->symtab_shndx_; |
| 2174 | typename This::Shdr symtabshdr(this, |
| 2175 | this->elf_file_.section_header(symtab_shndx)); |
| 2176 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
| 2177 | |
| 2178 | // Read the local symbols. |
| 2179 | const int sym_size = This::sym_size; |
| 2180 | const unsigned int loccount = this->local_symbol_count_; |
| 2181 | gold_assert(loccount == symtabshdr.get_sh_info()); |
| 2182 | off_t locsize = loccount * sym_size; |
| 2183 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
| 2184 | locsize, true, true); |
| 2185 | |
| 2186 | // Read the symbol names. |
| 2187 | const unsigned int strtab_shndx = |
| 2188 | this->adjust_shndx(symtabshdr.get_sh_link()); |
| 2189 | section_size_type strtab_size; |
| 2190 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, |
| 2191 | &strtab_size, |
| 2192 | true); |
| 2193 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
| 2194 | |
| 2195 | // Loop over the local symbols. |
| 2196 | |
| 2197 | const Output_sections& out_sections(this->output_sections()); |
| 2198 | std::vector<Address>& out_section_offsets(this->section_offsets()); |
| 2199 | unsigned int shnum = this->shnum(); |
| 2200 | unsigned int count = 0; |
| 2201 | unsigned int dyncount = 0; |
| 2202 | // Skip the first, dummy, symbol. |
| 2203 | psyms += sym_size; |
| 2204 | bool strip_all = parameters->options().strip_all(); |
| 2205 | bool discard_all = parameters->options().discard_all(); |
| 2206 | bool discard_locals = parameters->options().discard_locals(); |
| 2207 | bool discard_sec_merge = parameters->options().discard_sec_merge(); |
| 2208 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
| 2209 | { |
| 2210 | elfcpp::Sym<size, big_endian> sym(psyms); |
| 2211 | |
| 2212 | Symbol_value<size>& lv(this->local_values_[i]); |
| 2213 | |
| 2214 | bool is_ordinary; |
| 2215 | unsigned int shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(), |
| 2216 | &is_ordinary); |
| 2217 | lv.set_input_shndx(shndx, is_ordinary); |
| 2218 | |
| 2219 | if (sym.get_st_type() == elfcpp::STT_SECTION) |
| 2220 | lv.set_is_section_symbol(); |
| 2221 | else if (sym.get_st_type() == elfcpp::STT_TLS) |
| 2222 | lv.set_is_tls_symbol(); |
| 2223 | else if (sym.get_st_type() == elfcpp::STT_GNU_IFUNC) |
| 2224 | lv.set_is_ifunc_symbol(); |
| 2225 | |
| 2226 | // Save the input symbol value for use in do_finalize_local_symbols(). |
| 2227 | lv.set_input_value(sym.get_st_value()); |
| 2228 | |
| 2229 | // Decide whether this symbol should go into the output file. |
| 2230 | |
| 2231 | if (is_ordinary |
| 2232 | && shndx < shnum |
| 2233 | && (out_sections[shndx] == NULL |
| 2234 | || (out_sections[shndx]->order() == ORDER_EHFRAME |
| 2235 | && out_section_offsets[shndx] == invalid_address))) |
| 2236 | { |
| 2237 | // This is either a discarded section or an optimized .eh_frame |
| 2238 | // section. |
| 2239 | lv.set_no_output_symtab_entry(); |
| 2240 | gold_assert(!lv.needs_output_dynsym_entry()); |
| 2241 | continue; |
| 2242 | } |
| 2243 | |
| 2244 | if (sym.get_st_type() == elfcpp::STT_SECTION |
| 2245 | || !this->adjust_local_symbol(&lv)) |
| 2246 | { |
| 2247 | lv.set_no_output_symtab_entry(); |
| 2248 | gold_assert(!lv.needs_output_dynsym_entry()); |
| 2249 | continue; |
| 2250 | } |
| 2251 | |
| 2252 | if (sym.get_st_name() >= strtab_size) |
| 2253 | { |
| 2254 | this->error(_("local symbol %u section name out of range: %u >= %u"), |
| 2255 | i, sym.get_st_name(), |
| 2256 | static_cast<unsigned int>(strtab_size)); |
| 2257 | lv.set_no_output_symtab_entry(); |
| 2258 | continue; |
| 2259 | } |
| 2260 | |
| 2261 | const char* name = pnames + sym.get_st_name(); |
| 2262 | |
| 2263 | // If needed, add the symbol to the dynamic symbol table string pool. |
| 2264 | if (lv.needs_output_dynsym_entry()) |
| 2265 | { |
| 2266 | dynpool->add(name, true, NULL); |
| 2267 | ++dyncount; |
| 2268 | } |
| 2269 | |
| 2270 | if (strip_all |
| 2271 | || (discard_all && lv.may_be_discarded_from_output_symtab())) |
| 2272 | { |
| 2273 | lv.set_no_output_symtab_entry(); |
| 2274 | continue; |
| 2275 | } |
| 2276 | |
| 2277 | // By default, discard temporary local symbols in merge sections. |
| 2278 | // If --discard-locals option is used, discard all temporary local |
| 2279 | // symbols. These symbols start with system-specific local label |
| 2280 | // prefixes, typically .L for ELF system. We want to be compatible |
| 2281 | // with GNU ld so here we essentially use the same check in |
| 2282 | // bfd_is_local_label(). The code is different because we already |
| 2283 | // know that: |
| 2284 | // |
| 2285 | // - the symbol is local and thus cannot have global or weak binding. |
| 2286 | // - the symbol is not a section symbol. |
| 2287 | // - the symbol has a name. |
| 2288 | // |
| 2289 | // We do not discard a symbol if it needs a dynamic symbol entry. |
| 2290 | if ((discard_locals |
| 2291 | || (discard_sec_merge |
| 2292 | && is_ordinary |
| 2293 | && out_section_offsets[shndx] == invalid_address)) |
| 2294 | && sym.get_st_type() != elfcpp::STT_FILE |
| 2295 | && !lv.needs_output_dynsym_entry() |
| 2296 | && lv.may_be_discarded_from_output_symtab() |
| 2297 | && parameters->target().is_local_label_name(name)) |
| 2298 | { |
| 2299 | lv.set_no_output_symtab_entry(); |
| 2300 | continue; |
| 2301 | } |
| 2302 | |
| 2303 | // Discard the local symbol if -retain_symbols_file is specified |
| 2304 | // and the local symbol is not in that file. |
| 2305 | if (!parameters->options().should_retain_symbol(name)) |
| 2306 | { |
| 2307 | lv.set_no_output_symtab_entry(); |
| 2308 | continue; |
| 2309 | } |
| 2310 | |
| 2311 | // Add the symbol to the symbol table string pool. |
| 2312 | pool->add(name, true, NULL); |
| 2313 | ++count; |
| 2314 | } |
| 2315 | |
| 2316 | this->output_local_symbol_count_ = count; |
| 2317 | this->output_local_dynsym_count_ = dyncount; |
| 2318 | } |
| 2319 | |
| 2320 | // Compute the final value of a local symbol. |
| 2321 | |
| 2322 | template<int size, bool big_endian> |
| 2323 | typename Sized_relobj_file<size, big_endian>::Compute_final_local_value_status |
| 2324 | Sized_relobj_file<size, big_endian>::compute_final_local_value_internal( |
| 2325 | unsigned int r_sym, |
| 2326 | const Symbol_value<size>* lv_in, |
| 2327 | Symbol_value<size>* lv_out, |
| 2328 | bool relocatable, |
| 2329 | const Output_sections& out_sections, |
| 2330 | const std::vector<Address>& out_offsets, |
| 2331 | const Symbol_table* symtab) |
| 2332 | { |
| 2333 | // We are going to overwrite *LV_OUT, if it has a merged symbol value, |
| 2334 | // we may have a memory leak. |
| 2335 | gold_assert(lv_out->has_output_value()); |
| 2336 | |
| 2337 | bool is_ordinary; |
| 2338 | unsigned int shndx = lv_in->input_shndx(&is_ordinary); |
| 2339 | |
| 2340 | // Set the output symbol value. |
| 2341 | |
| 2342 | if (!is_ordinary) |
| 2343 | { |
| 2344 | if (shndx == elfcpp::SHN_ABS || Symbol::is_common_shndx(shndx)) |
| 2345 | lv_out->set_output_value(lv_in->input_value()); |
| 2346 | else |
| 2347 | { |
| 2348 | this->error(_("unknown section index %u for local symbol %u"), |
| 2349 | shndx, r_sym); |
| 2350 | lv_out->set_output_value(0); |
| 2351 | return This::CFLV_ERROR; |
| 2352 | } |
| 2353 | } |
| 2354 | else |
| 2355 | { |
| 2356 | if (shndx >= this->shnum()) |
| 2357 | { |
| 2358 | this->error(_("local symbol %u section index %u out of range"), |
| 2359 | r_sym, shndx); |
| 2360 | lv_out->set_output_value(0); |
| 2361 | return This::CFLV_ERROR; |
| 2362 | } |
| 2363 | |
| 2364 | Output_section* os = out_sections[shndx]; |
| 2365 | Address secoffset = out_offsets[shndx]; |
| 2366 | if (symtab->is_section_folded(this, shndx)) |
| 2367 | { |
| 2368 | gold_assert(os == NULL && secoffset == invalid_address); |
| 2369 | // Get the os of the section it is folded onto. |
| 2370 | Section_id folded = symtab->icf()->get_folded_section(this, |
| 2371 | shndx); |
| 2372 | gold_assert(folded.first != NULL); |
| 2373 | Sized_relobj_file<size, big_endian>* folded_obj = reinterpret_cast |
| 2374 | <Sized_relobj_file<size, big_endian>*>(folded.first); |
| 2375 | os = folded_obj->output_section(folded.second); |
| 2376 | gold_assert(os != NULL); |
| 2377 | secoffset = folded_obj->get_output_section_offset(folded.second); |
| 2378 | |
| 2379 | // This could be a relaxed input section. |
| 2380 | if (secoffset == invalid_address) |
| 2381 | { |
| 2382 | const Output_relaxed_input_section* relaxed_section = |
| 2383 | os->find_relaxed_input_section(folded_obj, folded.second); |
| 2384 | gold_assert(relaxed_section != NULL); |
| 2385 | secoffset = relaxed_section->address() - os->address(); |
| 2386 | } |
| 2387 | } |
| 2388 | |
| 2389 | if (os == NULL) |
| 2390 | { |
| 2391 | // This local symbol belongs to a section we are discarding. |
| 2392 | // In some cases when applying relocations later, we will |
| 2393 | // attempt to match it to the corresponding kept section, |
| 2394 | // so we leave the input value unchanged here. |
| 2395 | return This::CFLV_DISCARDED; |
| 2396 | } |
| 2397 | else if (secoffset == invalid_address) |
| 2398 | { |
| 2399 | uint64_t start; |
| 2400 | |
| 2401 | // This is a SHF_MERGE section or one which otherwise |
| 2402 | // requires special handling. |
| 2403 | if (os->order() == ORDER_EHFRAME) |
| 2404 | { |
| 2405 | // This local symbol belongs to a discarded or optimized |
| 2406 | // .eh_frame section. Just treat it like the case in which |
| 2407 | // os == NULL above. |
| 2408 | gold_assert(this->has_eh_frame_); |
| 2409 | return This::CFLV_DISCARDED; |
| 2410 | } |
| 2411 | else if (!lv_in->is_section_symbol()) |
| 2412 | { |
| 2413 | // This is not a section symbol. We can determine |
| 2414 | // the final value now. |
| 2415 | uint64_t value = |
| 2416 | os->output_address(this, shndx, lv_in->input_value()); |
| 2417 | if (relocatable) |
| 2418 | value -= os->address(); |
| 2419 | lv_out->set_output_value(value); |
| 2420 | } |
| 2421 | else if (!os->find_starting_output_address(this, shndx, &start)) |
| 2422 | { |
| 2423 | // This is a section symbol, but apparently not one in a |
| 2424 | // merged section. First check to see if this is a relaxed |
| 2425 | // input section. If so, use its address. Otherwise just |
| 2426 | // use the start of the output section. This happens with |
| 2427 | // relocatable links when the input object has section |
| 2428 | // symbols for arbitrary non-merge sections. |
| 2429 | const Output_section_data* posd = |
| 2430 | os->find_relaxed_input_section(this, shndx); |
| 2431 | if (posd != NULL) |
| 2432 | { |
| 2433 | uint64_t value = posd->address(); |
| 2434 | if (relocatable) |
| 2435 | value -= os->address(); |
| 2436 | lv_out->set_output_value(value); |
| 2437 | } |
| 2438 | else |
| 2439 | lv_out->set_output_value(os->address()); |
| 2440 | } |
| 2441 | else |
| 2442 | { |
| 2443 | // We have to consider the addend to determine the |
| 2444 | // value to use in a relocation. START is the start |
| 2445 | // of this input section. If we are doing a relocatable |
| 2446 | // link, use offset from start output section instead of |
| 2447 | // address. |
| 2448 | Address adjusted_start = |
| 2449 | relocatable ? start - os->address() : start; |
| 2450 | Merged_symbol_value<size>* msv = |
| 2451 | new Merged_symbol_value<size>(lv_in->input_value(), |
| 2452 | adjusted_start); |
| 2453 | lv_out->set_merged_symbol_value(msv); |
| 2454 | } |
| 2455 | } |
| 2456 | else if (lv_in->is_tls_symbol() |
| 2457 | || (lv_in->is_section_symbol() |
| 2458 | && (os->flags() & elfcpp::SHF_TLS))) |
| 2459 | lv_out->set_output_value(os->tls_offset() |
| 2460 | + secoffset |
| 2461 | + lv_in->input_value()); |
| 2462 | else |
| 2463 | lv_out->set_output_value((relocatable ? 0 : os->address()) |
| 2464 | + secoffset |
| 2465 | + lv_in->input_value()); |
| 2466 | } |
| 2467 | return This::CFLV_OK; |
| 2468 | } |
| 2469 | |
| 2470 | // Compute final local symbol value. R_SYM is the index of a local |
| 2471 | // symbol in symbol table. LV points to a symbol value, which is |
| 2472 | // expected to hold the input value and to be over-written by the |
| 2473 | // final value. SYMTAB points to a symbol table. Some targets may want |
| 2474 | // to know would-be-finalized local symbol values in relaxation. |
| 2475 | // Hence we provide this method. Since this method updates *LV, a |
| 2476 | // callee should make a copy of the original local symbol value and |
| 2477 | // use the copy instead of modifying an object's local symbols before |
| 2478 | // everything is finalized. The caller should also free up any allocated |
| 2479 | // memory in the return value in *LV. |
| 2480 | template<int size, bool big_endian> |
| 2481 | typename Sized_relobj_file<size, big_endian>::Compute_final_local_value_status |
| 2482 | Sized_relobj_file<size, big_endian>::compute_final_local_value( |
| 2483 | unsigned int r_sym, |
| 2484 | const Symbol_value<size>* lv_in, |
| 2485 | Symbol_value<size>* lv_out, |
| 2486 | const Symbol_table* symtab) |
| 2487 | { |
| 2488 | // This is just a wrapper of compute_final_local_value_internal. |
| 2489 | const bool relocatable = parameters->options().relocatable(); |
| 2490 | const Output_sections& out_sections(this->output_sections()); |
| 2491 | const std::vector<Address>& out_offsets(this->section_offsets()); |
| 2492 | return this->compute_final_local_value_internal(r_sym, lv_in, lv_out, |
| 2493 | relocatable, out_sections, |
| 2494 | out_offsets, symtab); |
| 2495 | } |
| 2496 | |
| 2497 | // Finalize the local symbols. Here we set the final value in |
| 2498 | // THIS->LOCAL_VALUES_ and set their output symbol table indexes. |
| 2499 | // This function is always called from a singleton thread. The actual |
| 2500 | // output of the local symbols will occur in a separate task. |
| 2501 | |
| 2502 | template<int size, bool big_endian> |
| 2503 | unsigned int |
| 2504 | Sized_relobj_file<size, big_endian>::do_finalize_local_symbols( |
| 2505 | unsigned int index, |
| 2506 | off_t off, |
| 2507 | Symbol_table* symtab) |
| 2508 | { |
| 2509 | gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); |
| 2510 | |
| 2511 | const unsigned int loccount = this->local_symbol_count_; |
| 2512 | this->local_symbol_offset_ = off; |
| 2513 | |
| 2514 | const bool relocatable = parameters->options().relocatable(); |
| 2515 | const Output_sections& out_sections(this->output_sections()); |
| 2516 | const std::vector<Address>& out_offsets(this->section_offsets()); |
| 2517 | |
| 2518 | for (unsigned int i = 1; i < loccount; ++i) |
| 2519 | { |
| 2520 | Symbol_value<size>* lv = &this->local_values_[i]; |
| 2521 | |
| 2522 | Compute_final_local_value_status cflv_status = |
| 2523 | this->compute_final_local_value_internal(i, lv, lv, relocatable, |
| 2524 | out_sections, out_offsets, |
| 2525 | symtab); |
| 2526 | switch (cflv_status) |
| 2527 | { |
| 2528 | case CFLV_OK: |
| 2529 | if (!lv->is_output_symtab_index_set()) |
| 2530 | { |
| 2531 | lv->set_output_symtab_index(index); |
| 2532 | ++index; |
| 2533 | } |
| 2534 | break; |
| 2535 | case CFLV_DISCARDED: |
| 2536 | case CFLV_ERROR: |
| 2537 | // Do nothing. |
| 2538 | break; |
| 2539 | default: |
| 2540 | gold_unreachable(); |
| 2541 | } |
| 2542 | } |
| 2543 | return index; |
| 2544 | } |
| 2545 | |
| 2546 | // Set the output dynamic symbol table indexes for the local variables. |
| 2547 | |
| 2548 | template<int size, bool big_endian> |
| 2549 | unsigned int |
| 2550 | Sized_relobj_file<size, big_endian>::do_set_local_dynsym_indexes( |
| 2551 | unsigned int index) |
| 2552 | { |
| 2553 | const unsigned int loccount = this->local_symbol_count_; |
| 2554 | for (unsigned int i = 1; i < loccount; ++i) |
| 2555 | { |
| 2556 | Symbol_value<size>& lv(this->local_values_[i]); |
| 2557 | if (lv.needs_output_dynsym_entry()) |
| 2558 | { |
| 2559 | lv.set_output_dynsym_index(index); |
| 2560 | ++index; |
| 2561 | } |
| 2562 | } |
| 2563 | return index; |
| 2564 | } |
| 2565 | |
| 2566 | // Set the offset where local dynamic symbol information will be stored. |
| 2567 | // Returns the count of local symbols contributed to the symbol table by |
| 2568 | // this object. |
| 2569 | |
| 2570 | template<int size, bool big_endian> |
| 2571 | unsigned int |
| 2572 | Sized_relobj_file<size, big_endian>::do_set_local_dynsym_offset(off_t off) |
| 2573 | { |
| 2574 | gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); |
| 2575 | this->local_dynsym_offset_ = off; |
| 2576 | return this->output_local_dynsym_count_; |
| 2577 | } |
| 2578 | |
| 2579 | // If Symbols_data is not NULL get the section flags from here otherwise |
| 2580 | // get it from the file. |
| 2581 | |
| 2582 | template<int size, bool big_endian> |
| 2583 | uint64_t |
| 2584 | Sized_relobj_file<size, big_endian>::do_section_flags(unsigned int shndx) |
| 2585 | { |
| 2586 | Symbols_data* sd = this->get_symbols_data(); |
| 2587 | if (sd != NULL) |
| 2588 | { |
| 2589 | const unsigned char* pshdrs = sd->section_headers_data |
| 2590 | + This::shdr_size * shndx; |
| 2591 | typename This::Shdr shdr(pshdrs); |
| 2592 | return shdr.get_sh_flags(); |
| 2593 | } |
| 2594 | // If sd is NULL, read the section header from the file. |
| 2595 | return this->elf_file_.section_flags(shndx); |
| 2596 | } |
| 2597 | |
| 2598 | // Get the section's ent size from Symbols_data. Called by get_section_contents |
| 2599 | // in icf.cc |
| 2600 | |
| 2601 | template<int size, bool big_endian> |
| 2602 | uint64_t |
| 2603 | Sized_relobj_file<size, big_endian>::do_section_entsize(unsigned int shndx) |
| 2604 | { |
| 2605 | Symbols_data* sd = this->get_symbols_data(); |
| 2606 | gold_assert(sd != NULL); |
| 2607 | |
| 2608 | const unsigned char* pshdrs = sd->section_headers_data |
| 2609 | + This::shdr_size * shndx; |
| 2610 | typename This::Shdr shdr(pshdrs); |
| 2611 | return shdr.get_sh_entsize(); |
| 2612 | } |
| 2613 | |
| 2614 | // Write out the local symbols. |
| 2615 | |
| 2616 | template<int size, bool big_endian> |
| 2617 | void |
| 2618 | Sized_relobj_file<size, big_endian>::write_local_symbols( |
| 2619 | Output_file* of, |
| 2620 | const Stringpool* sympool, |
| 2621 | const Stringpool* dynpool, |
| 2622 | Output_symtab_xindex* symtab_xindex, |
| 2623 | Output_symtab_xindex* dynsym_xindex, |
| 2624 | off_t symtab_off) |
| 2625 | { |
| 2626 | const bool strip_all = parameters->options().strip_all(); |
| 2627 | if (strip_all) |
| 2628 | { |
| 2629 | if (this->output_local_dynsym_count_ == 0) |
| 2630 | return; |
| 2631 | this->output_local_symbol_count_ = 0; |
| 2632 | } |
| 2633 | |
| 2634 | gold_assert(this->symtab_shndx_ != -1U); |
| 2635 | if (this->symtab_shndx_ == 0) |
| 2636 | { |
| 2637 | // This object has no symbols. Weird but legal. |
| 2638 | return; |
| 2639 | } |
| 2640 | |
| 2641 | // Read the symbol table section header. |
| 2642 | const unsigned int symtab_shndx = this->symtab_shndx_; |
| 2643 | typename This::Shdr symtabshdr(this, |
| 2644 | this->elf_file_.section_header(symtab_shndx)); |
| 2645 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
| 2646 | const unsigned int loccount = this->local_symbol_count_; |
| 2647 | gold_assert(loccount == symtabshdr.get_sh_info()); |
| 2648 | |
| 2649 | // Read the local symbols. |
| 2650 | const int sym_size = This::sym_size; |
| 2651 | off_t locsize = loccount * sym_size; |
| 2652 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
| 2653 | locsize, true, false); |
| 2654 | |
| 2655 | // Read the symbol names. |
| 2656 | const unsigned int strtab_shndx = |
| 2657 | this->adjust_shndx(symtabshdr.get_sh_link()); |
| 2658 | section_size_type strtab_size; |
| 2659 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, |
| 2660 | &strtab_size, |
| 2661 | false); |
| 2662 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
| 2663 | |
| 2664 | // Get views into the output file for the portions of the symbol table |
| 2665 | // and the dynamic symbol table that we will be writing. |
| 2666 | off_t output_size = this->output_local_symbol_count_ * sym_size; |
| 2667 | unsigned char* oview = NULL; |
| 2668 | if (output_size > 0) |
| 2669 | oview = of->get_output_view(symtab_off + this->local_symbol_offset_, |
| 2670 | output_size); |
| 2671 | |
| 2672 | off_t dyn_output_size = this->output_local_dynsym_count_ * sym_size; |
| 2673 | unsigned char* dyn_oview = NULL; |
| 2674 | if (dyn_output_size > 0) |
| 2675 | dyn_oview = of->get_output_view(this->local_dynsym_offset_, |
| 2676 | dyn_output_size); |
| 2677 | |
| 2678 | const Output_sections& out_sections(this->output_sections()); |
| 2679 | |
| 2680 | gold_assert(this->local_values_.size() == loccount); |
| 2681 | |
| 2682 | unsigned char* ov = oview; |
| 2683 | unsigned char* dyn_ov = dyn_oview; |
| 2684 | psyms += sym_size; |
| 2685 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
| 2686 | { |
| 2687 | elfcpp::Sym<size, big_endian> isym(psyms); |
| 2688 | |
| 2689 | Symbol_value<size>& lv(this->local_values_[i]); |
| 2690 | |
| 2691 | bool is_ordinary; |
| 2692 | unsigned int st_shndx = this->adjust_sym_shndx(i, isym.get_st_shndx(), |
| 2693 | &is_ordinary); |
| 2694 | if (is_ordinary) |
| 2695 | { |
| 2696 | gold_assert(st_shndx < out_sections.size()); |
| 2697 | if (out_sections[st_shndx] == NULL) |
| 2698 | continue; |
| 2699 | st_shndx = out_sections[st_shndx]->out_shndx(); |
| 2700 | if (st_shndx >= elfcpp::SHN_LORESERVE) |
| 2701 | { |
| 2702 | if (lv.has_output_symtab_entry()) |
| 2703 | symtab_xindex->add(lv.output_symtab_index(), st_shndx); |
| 2704 | if (lv.has_output_dynsym_entry()) |
| 2705 | dynsym_xindex->add(lv.output_dynsym_index(), st_shndx); |
| 2706 | st_shndx = elfcpp::SHN_XINDEX; |
| 2707 | } |
| 2708 | } |
| 2709 | |
| 2710 | // Write the symbol to the output symbol table. |
| 2711 | if (lv.has_output_symtab_entry()) |
| 2712 | { |
| 2713 | elfcpp::Sym_write<size, big_endian> osym(ov); |
| 2714 | |
| 2715 | gold_assert(isym.get_st_name() < strtab_size); |
| 2716 | const char* name = pnames + isym.get_st_name(); |
| 2717 | osym.put_st_name(sympool->get_offset(name)); |
| 2718 | osym.put_st_value(lv.value(this, 0)); |
| 2719 | osym.put_st_size(isym.get_st_size()); |
| 2720 | osym.put_st_info(isym.get_st_info()); |
| 2721 | osym.put_st_other(isym.get_st_other()); |
| 2722 | osym.put_st_shndx(st_shndx); |
| 2723 | |
| 2724 | ov += sym_size; |
| 2725 | } |
| 2726 | |
| 2727 | // Write the symbol to the output dynamic symbol table. |
| 2728 | if (lv.has_output_dynsym_entry()) |
| 2729 | { |
| 2730 | gold_assert(dyn_ov < dyn_oview + dyn_output_size); |
| 2731 | elfcpp::Sym_write<size, big_endian> osym(dyn_ov); |
| 2732 | |
| 2733 | gold_assert(isym.get_st_name() < strtab_size); |
| 2734 | const char* name = pnames + isym.get_st_name(); |
| 2735 | osym.put_st_name(dynpool->get_offset(name)); |
| 2736 | osym.put_st_value(lv.value(this, 0)); |
| 2737 | osym.put_st_size(isym.get_st_size()); |
| 2738 | osym.put_st_info(isym.get_st_info()); |
| 2739 | osym.put_st_other(isym.get_st_other()); |
| 2740 | osym.put_st_shndx(st_shndx); |
| 2741 | |
| 2742 | dyn_ov += sym_size; |
| 2743 | } |
| 2744 | } |
| 2745 | |
| 2746 | |
| 2747 | if (output_size > 0) |
| 2748 | { |
| 2749 | gold_assert(ov - oview == output_size); |
| 2750 | of->write_output_view(symtab_off + this->local_symbol_offset_, |
| 2751 | output_size, oview); |
| 2752 | } |
| 2753 | |
| 2754 | if (dyn_output_size > 0) |
| 2755 | { |
| 2756 | gold_assert(dyn_ov - dyn_oview == dyn_output_size); |
| 2757 | of->write_output_view(this->local_dynsym_offset_, dyn_output_size, |
| 2758 | dyn_oview); |
| 2759 | } |
| 2760 | } |
| 2761 | |
| 2762 | // Set *INFO to symbolic information about the offset OFFSET in the |
| 2763 | // section SHNDX. Return true if we found something, false if we |
| 2764 | // found nothing. |
| 2765 | |
| 2766 | template<int size, bool big_endian> |
| 2767 | bool |
| 2768 | Sized_relobj_file<size, big_endian>::get_symbol_location_info( |
| 2769 | unsigned int shndx, |
| 2770 | off_t offset, |
| 2771 | Symbol_location_info* info) |
| 2772 | { |
| 2773 | if (this->symtab_shndx_ == 0) |
| 2774 | return false; |
| 2775 | |
| 2776 | section_size_type symbols_size; |
| 2777 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, |
| 2778 | &symbols_size, |
| 2779 | false); |
| 2780 | |
| 2781 | unsigned int symbol_names_shndx = |
| 2782 | this->adjust_shndx(this->section_link(this->symtab_shndx_)); |
| 2783 | section_size_type names_size; |
| 2784 | const unsigned char* symbol_names_u = |
| 2785 | this->section_contents(symbol_names_shndx, &names_size, false); |
| 2786 | const char* symbol_names = reinterpret_cast<const char*>(symbol_names_u); |
| 2787 | |
| 2788 | const int sym_size = This::sym_size; |
| 2789 | const size_t count = symbols_size / sym_size; |
| 2790 | |
| 2791 | const unsigned char* p = symbols; |
| 2792 | for (size_t i = 0; i < count; ++i, p += sym_size) |
| 2793 | { |
| 2794 | elfcpp::Sym<size, big_endian> sym(p); |
| 2795 | |
| 2796 | if (sym.get_st_type() == elfcpp::STT_FILE) |
| 2797 | { |
| 2798 | if (sym.get_st_name() >= names_size) |
| 2799 | info->source_file = "(invalid)"; |
| 2800 | else |
| 2801 | info->source_file = symbol_names + sym.get_st_name(); |
| 2802 | continue; |
| 2803 | } |
| 2804 | |
| 2805 | bool is_ordinary; |
| 2806 | unsigned int st_shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(), |
| 2807 | &is_ordinary); |
| 2808 | if (is_ordinary |
| 2809 | && st_shndx == shndx |
| 2810 | && static_cast<off_t>(sym.get_st_value()) <= offset |
| 2811 | && (static_cast<off_t>(sym.get_st_value() + sym.get_st_size()) |
| 2812 | > offset)) |
| 2813 | { |
| 2814 | info->enclosing_symbol_type = sym.get_st_type(); |
| 2815 | if (sym.get_st_name() > names_size) |
| 2816 | info->enclosing_symbol_name = "(invalid)"; |
| 2817 | else |
| 2818 | { |
| 2819 | info->enclosing_symbol_name = symbol_names + sym.get_st_name(); |
| 2820 | if (parameters->options().do_demangle()) |
| 2821 | { |
| 2822 | char* demangled_name = cplus_demangle( |
| 2823 | info->enclosing_symbol_name.c_str(), |
| 2824 | DMGL_ANSI | DMGL_PARAMS); |
| 2825 | if (demangled_name != NULL) |
| 2826 | { |
| 2827 | info->enclosing_symbol_name.assign(demangled_name); |
| 2828 | free(demangled_name); |
| 2829 | } |
| 2830 | } |
| 2831 | } |
| 2832 | return true; |
| 2833 | } |
| 2834 | } |
| 2835 | |
| 2836 | return false; |
| 2837 | } |
| 2838 | |
| 2839 | // Look for a kept section corresponding to the given discarded section, |
| 2840 | // and return its output address. This is used only for relocations in |
| 2841 | // debugging sections. If we can't find the kept section, return 0. |
| 2842 | |
| 2843 | template<int size, bool big_endian> |
| 2844 | typename Sized_relobj_file<size, big_endian>::Address |
| 2845 | Sized_relobj_file<size, big_endian>::map_to_kept_section( |
| 2846 | unsigned int shndx, |
| 2847 | bool* found) const |
| 2848 | { |
| 2849 | Relobj* kept_object; |
| 2850 | unsigned int kept_shndx; |
| 2851 | if (this->get_kept_comdat_section(shndx, &kept_object, &kept_shndx)) |
| 2852 | { |
| 2853 | Sized_relobj_file<size, big_endian>* kept_relobj = |
| 2854 | static_cast<Sized_relobj_file<size, big_endian>*>(kept_object); |
| 2855 | Output_section* os = kept_relobj->output_section(kept_shndx); |
| 2856 | Address offset = kept_relobj->get_output_section_offset(kept_shndx); |
| 2857 | if (os != NULL && offset != invalid_address) |
| 2858 | { |
| 2859 | *found = true; |
| 2860 | return os->address() + offset; |
| 2861 | } |
| 2862 | } |
| 2863 | *found = false; |
| 2864 | return 0; |
| 2865 | } |
| 2866 | |
| 2867 | // Get symbol counts. |
| 2868 | |
| 2869 | template<int size, bool big_endian> |
| 2870 | void |
| 2871 | Sized_relobj_file<size, big_endian>::do_get_global_symbol_counts( |
| 2872 | const Symbol_table*, |
| 2873 | size_t* defined, |
| 2874 | size_t* used) const |
| 2875 | { |
| 2876 | *defined = this->defined_count_; |
| 2877 | size_t count = 0; |
| 2878 | for (typename Symbols::const_iterator p = this->symbols_.begin(); |
| 2879 | p != this->symbols_.end(); |
| 2880 | ++p) |
| 2881 | if (*p != NULL |
| 2882 | && (*p)->source() == Symbol::FROM_OBJECT |
| 2883 | && (*p)->object() == this |
| 2884 | && (*p)->is_defined()) |
| 2885 | ++count; |
| 2886 | *used = count; |
| 2887 | } |
| 2888 | |
| 2889 | // Return a view of the decompressed contents of a section. Set *PLEN |
| 2890 | // to the size. Set *IS_NEW to true if the contents need to be freed |
| 2891 | // by the caller. |
| 2892 | |
| 2893 | const unsigned char* |
| 2894 | Object::decompressed_section_contents( |
| 2895 | unsigned int shndx, |
| 2896 | section_size_type* plen, |
| 2897 | bool* is_new) |
| 2898 | { |
| 2899 | section_size_type buffer_size; |
| 2900 | const unsigned char* buffer = this->do_section_contents(shndx, &buffer_size, |
| 2901 | false); |
| 2902 | |
| 2903 | if (this->compressed_sections_ == NULL) |
| 2904 | { |
| 2905 | *plen = buffer_size; |
| 2906 | *is_new = false; |
| 2907 | return buffer; |
| 2908 | } |
| 2909 | |
| 2910 | Compressed_section_map::const_iterator p = |
| 2911 | this->compressed_sections_->find(shndx); |
| 2912 | if (p == this->compressed_sections_->end()) |
| 2913 | { |
| 2914 | *plen = buffer_size; |
| 2915 | *is_new = false; |
| 2916 | return buffer; |
| 2917 | } |
| 2918 | |
| 2919 | section_size_type uncompressed_size = p->second.size; |
| 2920 | if (p->second.contents != NULL) |
| 2921 | { |
| 2922 | *plen = uncompressed_size; |
| 2923 | *is_new = false; |
| 2924 | return p->second.contents; |
| 2925 | } |
| 2926 | |
| 2927 | unsigned char* uncompressed_data = new unsigned char[uncompressed_size]; |
| 2928 | if (!decompress_input_section(buffer, |
| 2929 | buffer_size, |
| 2930 | uncompressed_data, |
| 2931 | uncompressed_size, |
| 2932 | elfsize(), |
| 2933 | is_big_endian(), |
| 2934 | p->second.flag)) |
| 2935 | this->error(_("could not decompress section %s"), |
| 2936 | this->do_section_name(shndx).c_str()); |
| 2937 | |
| 2938 | // We could cache the results in p->second.contents and store |
| 2939 | // false in *IS_NEW, but build_compressed_section_map() would |
| 2940 | // have done so if it had expected it to be profitable. If |
| 2941 | // we reach this point, we expect to need the contents only |
| 2942 | // once in this pass. |
| 2943 | *plen = uncompressed_size; |
| 2944 | *is_new = true; |
| 2945 | return uncompressed_data; |
| 2946 | } |
| 2947 | |
| 2948 | // Discard any buffers of uncompressed sections. This is done |
| 2949 | // at the end of the Add_symbols task. |
| 2950 | |
| 2951 | void |
| 2952 | Object::discard_decompressed_sections() |
| 2953 | { |
| 2954 | if (this->compressed_sections_ == NULL) |
| 2955 | return; |
| 2956 | |
| 2957 | for (Compressed_section_map::iterator p = this->compressed_sections_->begin(); |
| 2958 | p != this->compressed_sections_->end(); |
| 2959 | ++p) |
| 2960 | { |
| 2961 | if (p->second.contents != NULL) |
| 2962 | { |
| 2963 | delete[] p->second.contents; |
| 2964 | p->second.contents = NULL; |
| 2965 | } |
| 2966 | } |
| 2967 | } |
| 2968 | |
| 2969 | // Input_objects methods. |
| 2970 | |
| 2971 | // Add a regular relocatable object to the list. Return false if this |
| 2972 | // object should be ignored. |
| 2973 | |
| 2974 | bool |
| 2975 | Input_objects::add_object(Object* obj) |
| 2976 | { |
| 2977 | // Print the filename if the -t/--trace option is selected. |
| 2978 | if (parameters->options().trace()) |
| 2979 | gold_info("%s", obj->name().c_str()); |
| 2980 | |
| 2981 | if (!obj->is_dynamic()) |
| 2982 | this->relobj_list_.push_back(static_cast<Relobj*>(obj)); |
| 2983 | else |
| 2984 | { |
| 2985 | // See if this is a duplicate SONAME. |
| 2986 | Dynobj* dynobj = static_cast<Dynobj*>(obj); |
| 2987 | const char* soname = dynobj->soname(); |
| 2988 | |
| 2989 | Unordered_map<std::string, Object*>::value_type val(soname, obj); |
| 2990 | std::pair<Unordered_map<std::string, Object*>::iterator, bool> ins = |
| 2991 | this->sonames_.insert(val); |
| 2992 | if (!ins.second) |
| 2993 | { |
| 2994 | // We have already seen a dynamic object with this soname. |
| 2995 | // If any instances of this object on the command line have |
| 2996 | // the --no-as-needed flag, make sure the one we keep is |
| 2997 | // marked so. |
| 2998 | if (!obj->as_needed()) |
| 2999 | { |
| 3000 | gold_assert(ins.first->second != NULL); |
| 3001 | ins.first->second->clear_as_needed(); |
| 3002 | } |
| 3003 | return false; |
| 3004 | } |
| 3005 | |
| 3006 | this->dynobj_list_.push_back(dynobj); |
| 3007 | } |
| 3008 | |
| 3009 | // Add this object to the cross-referencer if requested. |
| 3010 | if (parameters->options().user_set_print_symbol_counts() |
| 3011 | || parameters->options().cref()) |
| 3012 | { |
| 3013 | if (this->cref_ == NULL) |
| 3014 | this->cref_ = new Cref(); |
| 3015 | this->cref_->add_object(obj); |
| 3016 | } |
| 3017 | |
| 3018 | return true; |
| 3019 | } |
| 3020 | |
| 3021 | // For each dynamic object, record whether we've seen all of its |
| 3022 | // explicit dependencies. |
| 3023 | |
| 3024 | void |
| 3025 | Input_objects::check_dynamic_dependencies() const |
| 3026 | { |
| 3027 | bool issued_copy_dt_needed_error = false; |
| 3028 | for (Dynobj_list::const_iterator p = this->dynobj_list_.begin(); |
| 3029 | p != this->dynobj_list_.end(); |
| 3030 | ++p) |
| 3031 | { |
| 3032 | const Dynobj::Needed& needed((*p)->needed()); |
| 3033 | bool found_all = true; |
| 3034 | Dynobj::Needed::const_iterator pneeded; |
| 3035 | for (pneeded = needed.begin(); pneeded != needed.end(); ++pneeded) |
| 3036 | { |
| 3037 | if (this->sonames_.find(*pneeded) == this->sonames_.end()) |
| 3038 | { |
| 3039 | found_all = false; |
| 3040 | break; |
| 3041 | } |
| 3042 | } |
| 3043 | (*p)->set_has_unknown_needed_entries(!found_all); |
| 3044 | |
| 3045 | // --copy-dt-needed-entries aka --add-needed is a GNU ld option |
| 3046 | // that gold does not support. However, they cause no trouble |
| 3047 | // unless there is a DT_NEEDED entry that we don't know about; |
| 3048 | // warn only in that case. |
| 3049 | if (!found_all |
| 3050 | && !issued_copy_dt_needed_error |
| 3051 | && (parameters->options().copy_dt_needed_entries() |
| 3052 | || parameters->options().add_needed())) |
| 3053 | { |
| 3054 | const char* optname; |
| 3055 | if (parameters->options().copy_dt_needed_entries()) |
| 3056 | optname = "--copy-dt-needed-entries"; |
| 3057 | else |
| 3058 | optname = "--add-needed"; |
| 3059 | gold_error(_("%s is not supported but is required for %s in %s"), |
| 3060 | optname, (*pneeded).c_str(), (*p)->name().c_str()); |
| 3061 | issued_copy_dt_needed_error = true; |
| 3062 | } |
| 3063 | } |
| 3064 | } |
| 3065 | |
| 3066 | // Start processing an archive. |
| 3067 | |
| 3068 | void |
| 3069 | Input_objects::archive_start(Archive* archive) |
| 3070 | { |
| 3071 | if (parameters->options().user_set_print_symbol_counts() |
| 3072 | || parameters->options().cref()) |
| 3073 | { |
| 3074 | if (this->cref_ == NULL) |
| 3075 | this->cref_ = new Cref(); |
| 3076 | this->cref_->add_archive_start(archive); |
| 3077 | } |
| 3078 | } |
| 3079 | |
| 3080 | // Stop processing an archive. |
| 3081 | |
| 3082 | void |
| 3083 | Input_objects::archive_stop(Archive* archive) |
| 3084 | { |
| 3085 | if (parameters->options().user_set_print_symbol_counts() |
| 3086 | || parameters->options().cref()) |
| 3087 | this->cref_->add_archive_stop(archive); |
| 3088 | } |
| 3089 | |
| 3090 | // Print symbol counts |
| 3091 | |
| 3092 | void |
| 3093 | Input_objects::print_symbol_counts(const Symbol_table* symtab) const |
| 3094 | { |
| 3095 | if (parameters->options().user_set_print_symbol_counts() |
| 3096 | && this->cref_ != NULL) |
| 3097 | this->cref_->print_symbol_counts(symtab); |
| 3098 | } |
| 3099 | |
| 3100 | // Print a cross reference table. |
| 3101 | |
| 3102 | void |
| 3103 | Input_objects::print_cref(const Symbol_table* symtab, FILE* f) const |
| 3104 | { |
| 3105 | if (parameters->options().cref() && this->cref_ != NULL) |
| 3106 | this->cref_->print_cref(symtab, f); |
| 3107 | } |
| 3108 | |
| 3109 | // Relocate_info methods. |
| 3110 | |
| 3111 | // Return a string describing the location of a relocation when file |
| 3112 | // and lineno information is not available. This is only used in |
| 3113 | // error messages. |
| 3114 | |
| 3115 | template<int size, bool big_endian> |
| 3116 | std::string |
| 3117 | Relocate_info<size, big_endian>::location(size_t, off_t offset) const |
| 3118 | { |
| 3119 | Sized_dwarf_line_info<size, big_endian> line_info(this->object); |
| 3120 | std::string ret = line_info.addr2line(this->data_shndx, offset, NULL); |
| 3121 | if (!ret.empty()) |
| 3122 | return ret; |
| 3123 | |
| 3124 | ret = this->object->name(); |
| 3125 | |
| 3126 | Symbol_location_info info; |
| 3127 | if (this->object->get_symbol_location_info(this->data_shndx, offset, &info)) |
| 3128 | { |
| 3129 | if (!info.source_file.empty()) |
| 3130 | { |
| 3131 | ret += ":"; |
| 3132 | ret += info.source_file; |
| 3133 | } |
| 3134 | ret += ":"; |
| 3135 | if (info.enclosing_symbol_type == elfcpp::STT_FUNC) |
| 3136 | ret += _("function "); |
| 3137 | ret += info.enclosing_symbol_name; |
| 3138 | return ret; |
| 3139 | } |
| 3140 | |
| 3141 | ret += "("; |
| 3142 | ret += this->object->section_name(this->data_shndx); |
| 3143 | char buf[100]; |
| 3144 | snprintf(buf, sizeof buf, "+0x%lx)", static_cast<long>(offset)); |
| 3145 | ret += buf; |
| 3146 | return ret; |
| 3147 | } |
| 3148 | |
| 3149 | } // End namespace gold. |
| 3150 | |
| 3151 | namespace |
| 3152 | { |
| 3153 | |
| 3154 | using namespace gold; |
| 3155 | |
| 3156 | // Read an ELF file with the header and return the appropriate |
| 3157 | // instance of Object. |
| 3158 | |
| 3159 | template<int size, bool big_endian> |
| 3160 | Object* |
| 3161 | make_elf_sized_object(const std::string& name, Input_file* input_file, |
| 3162 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr, |
| 3163 | bool* punconfigured) |
| 3164 | { |
| 3165 | Target* target = select_target(input_file, offset, |
| 3166 | ehdr.get_e_machine(), size, big_endian, |
| 3167 | ehdr.get_e_ident()[elfcpp::EI_OSABI], |
| 3168 | ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); |
| 3169 | if (target == NULL) |
| 3170 | gold_fatal(_("%s: unsupported ELF machine number %d"), |
| 3171 | name.c_str(), ehdr.get_e_machine()); |
| 3172 | |
| 3173 | if (!parameters->target_valid()) |
| 3174 | set_parameters_target(target); |
| 3175 | else if (target != ¶meters->target()) |
| 3176 | { |
| 3177 | if (punconfigured != NULL) |
| 3178 | *punconfigured = true; |
| 3179 | else |
| 3180 | gold_error(_("%s: incompatible target"), name.c_str()); |
| 3181 | return NULL; |
| 3182 | } |
| 3183 | |
| 3184 | return target->make_elf_object<size, big_endian>(name, input_file, offset, |
| 3185 | ehdr); |
| 3186 | } |
| 3187 | |
| 3188 | } // End anonymous namespace. |
| 3189 | |
| 3190 | namespace gold |
| 3191 | { |
| 3192 | |
| 3193 | // Return whether INPUT_FILE is an ELF object. |
| 3194 | |
| 3195 | bool |
| 3196 | is_elf_object(Input_file* input_file, off_t offset, |
| 3197 | const unsigned char** start, int* read_size) |
| 3198 | { |
| 3199 | off_t filesize = input_file->file().filesize(); |
| 3200 | int want = elfcpp::Elf_recognizer::max_header_size; |
| 3201 | if (filesize - offset < want) |
| 3202 | want = filesize - offset; |
| 3203 | |
| 3204 | const unsigned char* p = input_file->file().get_view(offset, 0, want, |
| 3205 | true, false); |
| 3206 | *start = p; |
| 3207 | *read_size = want; |
| 3208 | |
| 3209 | return elfcpp::Elf_recognizer::is_elf_file(p, want); |
| 3210 | } |
| 3211 | |
| 3212 | // Read an ELF file and return the appropriate instance of Object. |
| 3213 | |
| 3214 | Object* |
| 3215 | make_elf_object(const std::string& name, Input_file* input_file, off_t offset, |
| 3216 | const unsigned char* p, section_offset_type bytes, |
| 3217 | bool* punconfigured) |
| 3218 | { |
| 3219 | if (punconfigured != NULL) |
| 3220 | *punconfigured = false; |
| 3221 | |
| 3222 | std::string error; |
| 3223 | bool big_endian = false; |
| 3224 | int size = 0; |
| 3225 | if (!elfcpp::Elf_recognizer::is_valid_header(p, bytes, &size, |
| 3226 | &big_endian, &error)) |
| 3227 | { |
| 3228 | gold_error(_("%s: %s"), name.c_str(), error.c_str()); |
| 3229 | return NULL; |
| 3230 | } |
| 3231 | |
| 3232 | if (size == 32) |
| 3233 | { |
| 3234 | if (big_endian) |
| 3235 | { |
| 3236 | #ifdef HAVE_TARGET_32_BIG |
| 3237 | elfcpp::Ehdr<32, true> ehdr(p); |
| 3238 | return make_elf_sized_object<32, true>(name, input_file, |
| 3239 | offset, ehdr, punconfigured); |
| 3240 | #else |
| 3241 | if (punconfigured != NULL) |
| 3242 | *punconfigured = true; |
| 3243 | else |
| 3244 | gold_error(_("%s: not configured to support " |
| 3245 | "32-bit big-endian object"), |
| 3246 | name.c_str()); |
| 3247 | return NULL; |
| 3248 | #endif |
| 3249 | } |
| 3250 | else |
| 3251 | { |
| 3252 | #ifdef HAVE_TARGET_32_LITTLE |
| 3253 | elfcpp::Ehdr<32, false> ehdr(p); |
| 3254 | return make_elf_sized_object<32, false>(name, input_file, |
| 3255 | offset, ehdr, punconfigured); |
| 3256 | #else |
| 3257 | if (punconfigured != NULL) |
| 3258 | *punconfigured = true; |
| 3259 | else |
| 3260 | gold_error(_("%s: not configured to support " |
| 3261 | "32-bit little-endian object"), |
| 3262 | name.c_str()); |
| 3263 | return NULL; |
| 3264 | #endif |
| 3265 | } |
| 3266 | } |
| 3267 | else if (size == 64) |
| 3268 | { |
| 3269 | if (big_endian) |
| 3270 | { |
| 3271 | #ifdef HAVE_TARGET_64_BIG |
| 3272 | elfcpp::Ehdr<64, true> ehdr(p); |
| 3273 | return make_elf_sized_object<64, true>(name, input_file, |
| 3274 | offset, ehdr, punconfigured); |
| 3275 | #else |
| 3276 | if (punconfigured != NULL) |
| 3277 | *punconfigured = true; |
| 3278 | else |
| 3279 | gold_error(_("%s: not configured to support " |
| 3280 | "64-bit big-endian object"), |
| 3281 | name.c_str()); |
| 3282 | return NULL; |
| 3283 | #endif |
| 3284 | } |
| 3285 | else |
| 3286 | { |
| 3287 | #ifdef HAVE_TARGET_64_LITTLE |
| 3288 | elfcpp::Ehdr<64, false> ehdr(p); |
| 3289 | return make_elf_sized_object<64, false>(name, input_file, |
| 3290 | offset, ehdr, punconfigured); |
| 3291 | #else |
| 3292 | if (punconfigured != NULL) |
| 3293 | *punconfigured = true; |
| 3294 | else |
| 3295 | gold_error(_("%s: not configured to support " |
| 3296 | "64-bit little-endian object"), |
| 3297 | name.c_str()); |
| 3298 | return NULL; |
| 3299 | #endif |
| 3300 | } |
| 3301 | } |
| 3302 | else |
| 3303 | gold_unreachable(); |
| 3304 | } |
| 3305 | |
| 3306 | // Instantiate the templates we need. |
| 3307 | |
| 3308 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) |
| 3309 | template |
| 3310 | void |
| 3311 | Relobj::initialize_input_to_output_map<64>(unsigned int shndx, |
| 3312 | elfcpp::Elf_types<64>::Elf_Addr starting_address, |
| 3313 | Unordered_map<section_offset_type, |
| 3314 | elfcpp::Elf_types<64>::Elf_Addr>* output_addresses) const; |
| 3315 | #endif |
| 3316 | |
| 3317 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
| 3318 | template |
| 3319 | void |
| 3320 | Relobj::initialize_input_to_output_map<32>(unsigned int shndx, |
| 3321 | elfcpp::Elf_types<32>::Elf_Addr starting_address, |
| 3322 | Unordered_map<section_offset_type, |
| 3323 | elfcpp::Elf_types<32>::Elf_Addr>* output_addresses) const; |
| 3324 | #endif |
| 3325 | |
| 3326 | #ifdef HAVE_TARGET_32_LITTLE |
| 3327 | template |
| 3328 | void |
| 3329 | Object::read_section_data<32, false>(elfcpp::Elf_file<32, false, Object>*, |
| 3330 | Read_symbols_data*); |
| 3331 | template |
| 3332 | const unsigned char* |
| 3333 | Object::find_shdr<32,false>(const unsigned char*, const char*, const char*, |
| 3334 | section_size_type, const unsigned char*) const; |
| 3335 | #endif |
| 3336 | |
| 3337 | #ifdef HAVE_TARGET_32_BIG |
| 3338 | template |
| 3339 | void |
| 3340 | Object::read_section_data<32, true>(elfcpp::Elf_file<32, true, Object>*, |
| 3341 | Read_symbols_data*); |
| 3342 | template |
| 3343 | const unsigned char* |
| 3344 | Object::find_shdr<32,true>(const unsigned char*, const char*, const char*, |
| 3345 | section_size_type, const unsigned char*) const; |
| 3346 | #endif |
| 3347 | |
| 3348 | #ifdef HAVE_TARGET_64_LITTLE |
| 3349 | template |
| 3350 | void |
| 3351 | Object::read_section_data<64, false>(elfcpp::Elf_file<64, false, Object>*, |
| 3352 | Read_symbols_data*); |
| 3353 | template |
| 3354 | const unsigned char* |
| 3355 | Object::find_shdr<64,false>(const unsigned char*, const char*, const char*, |
| 3356 | section_size_type, const unsigned char*) const; |
| 3357 | #endif |
| 3358 | |
| 3359 | #ifdef HAVE_TARGET_64_BIG |
| 3360 | template |
| 3361 | void |
| 3362 | Object::read_section_data<64, true>(elfcpp::Elf_file<64, true, Object>*, |
| 3363 | Read_symbols_data*); |
| 3364 | template |
| 3365 | const unsigned char* |
| 3366 | Object::find_shdr<64,true>(const unsigned char*, const char*, const char*, |
| 3367 | section_size_type, const unsigned char*) const; |
| 3368 | #endif |
| 3369 | |
| 3370 | #ifdef HAVE_TARGET_32_LITTLE |
| 3371 | template |
| 3372 | class Sized_relobj<32, false>; |
| 3373 | |
| 3374 | template |
| 3375 | class Sized_relobj_file<32, false>; |
| 3376 | #endif |
| 3377 | |
| 3378 | #ifdef HAVE_TARGET_32_BIG |
| 3379 | template |
| 3380 | class Sized_relobj<32, true>; |
| 3381 | |
| 3382 | template |
| 3383 | class Sized_relobj_file<32, true>; |
| 3384 | #endif |
| 3385 | |
| 3386 | #ifdef HAVE_TARGET_64_LITTLE |
| 3387 | template |
| 3388 | class Sized_relobj<64, false>; |
| 3389 | |
| 3390 | template |
| 3391 | class Sized_relobj_file<64, false>; |
| 3392 | #endif |
| 3393 | |
| 3394 | #ifdef HAVE_TARGET_64_BIG |
| 3395 | template |
| 3396 | class Sized_relobj<64, true>; |
| 3397 | |
| 3398 | template |
| 3399 | class Sized_relobj_file<64, true>; |
| 3400 | #endif |
| 3401 | |
| 3402 | #ifdef HAVE_TARGET_32_LITTLE |
| 3403 | template |
| 3404 | struct Relocate_info<32, false>; |
| 3405 | #endif |
| 3406 | |
| 3407 | #ifdef HAVE_TARGET_32_BIG |
| 3408 | template |
| 3409 | struct Relocate_info<32, true>; |
| 3410 | #endif |
| 3411 | |
| 3412 | #ifdef HAVE_TARGET_64_LITTLE |
| 3413 | template |
| 3414 | struct Relocate_info<64, false>; |
| 3415 | #endif |
| 3416 | |
| 3417 | #ifdef HAVE_TARGET_64_BIG |
| 3418 | template |
| 3419 | struct Relocate_info<64, true>; |
| 3420 | #endif |
| 3421 | |
| 3422 | #ifdef HAVE_TARGET_32_LITTLE |
| 3423 | template |
| 3424 | void |
| 3425 | Xindex::initialize_symtab_xindex<32, false>(Object*, unsigned int); |
| 3426 | |
| 3427 | template |
| 3428 | void |
| 3429 | Xindex::read_symtab_xindex<32, false>(Object*, unsigned int, |
| 3430 | const unsigned char*); |
| 3431 | #endif |
| 3432 | |
| 3433 | #ifdef HAVE_TARGET_32_BIG |
| 3434 | template |
| 3435 | void |
| 3436 | Xindex::initialize_symtab_xindex<32, true>(Object*, unsigned int); |
| 3437 | |
| 3438 | template |
| 3439 | void |
| 3440 | Xindex::read_symtab_xindex<32, true>(Object*, unsigned int, |
| 3441 | const unsigned char*); |
| 3442 | #endif |
| 3443 | |
| 3444 | #ifdef HAVE_TARGET_64_LITTLE |
| 3445 | template |
| 3446 | void |
| 3447 | Xindex::initialize_symtab_xindex<64, false>(Object*, unsigned int); |
| 3448 | |
| 3449 | template |
| 3450 | void |
| 3451 | Xindex::read_symtab_xindex<64, false>(Object*, unsigned int, |
| 3452 | const unsigned char*); |
| 3453 | #endif |
| 3454 | |
| 3455 | #ifdef HAVE_TARGET_64_BIG |
| 3456 | template |
| 3457 | void |
| 3458 | Xindex::initialize_symtab_xindex<64, true>(Object*, unsigned int); |
| 3459 | |
| 3460 | template |
| 3461 | void |
| 3462 | Xindex::read_symtab_xindex<64, true>(Object*, unsigned int, |
| 3463 | const unsigned char*); |
| 3464 | #endif |
| 3465 | |
| 3466 | #ifdef HAVE_TARGET_32_LITTLE |
| 3467 | template |
| 3468 | Compressed_section_map* |
| 3469 | build_compressed_section_map<32, false>(const unsigned char*, unsigned int, |
| 3470 | const char*, section_size_type, |
| 3471 | Object*, bool); |
| 3472 | #endif |
| 3473 | |
| 3474 | #ifdef HAVE_TARGET_32_BIG |
| 3475 | template |
| 3476 | Compressed_section_map* |
| 3477 | build_compressed_section_map<32, true>(const unsigned char*, unsigned int, |
| 3478 | const char*, section_size_type, |
| 3479 | Object*, bool); |
| 3480 | #endif |
| 3481 | |
| 3482 | #ifdef HAVE_TARGET_64_LITTLE |
| 3483 | template |
| 3484 | Compressed_section_map* |
| 3485 | build_compressed_section_map<64, false>(const unsigned char*, unsigned int, |
| 3486 | const char*, section_size_type, |
| 3487 | Object*, bool); |
| 3488 | #endif |
| 3489 | |
| 3490 | #ifdef HAVE_TARGET_64_BIG |
| 3491 | template |
| 3492 | Compressed_section_map* |
| 3493 | build_compressed_section_map<64, true>(const unsigned char*, unsigned int, |
| 3494 | const char*, section_size_type, |
| 3495 | Object*, bool); |
| 3496 | #endif |
| 3497 | |
| 3498 | } // End namespace gold. |