| 1 | // layout.cc -- lay out output file sections for gold |
| 2 | |
| 3 | // Copyright 2006, 2007, 2008, 2009, 2010 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 <algorithm> |
| 28 | #include <iostream> |
| 29 | #include <utility> |
| 30 | #include <fcntl.h> |
| 31 | #include <unistd.h> |
| 32 | #include "libiberty.h" |
| 33 | #include "md5.h" |
| 34 | #include "sha1.h" |
| 35 | |
| 36 | #include "parameters.h" |
| 37 | #include "options.h" |
| 38 | #include "mapfile.h" |
| 39 | #include "script.h" |
| 40 | #include "script-sections.h" |
| 41 | #include "output.h" |
| 42 | #include "symtab.h" |
| 43 | #include "dynobj.h" |
| 44 | #include "ehframe.h" |
| 45 | #include "compressed_output.h" |
| 46 | #include "reduced_debug_output.h" |
| 47 | #include "reloc.h" |
| 48 | #include "descriptors.h" |
| 49 | #include "plugin.h" |
| 50 | #include "incremental.h" |
| 51 | #include "layout.h" |
| 52 | |
| 53 | namespace gold |
| 54 | { |
| 55 | |
| 56 | // Layout::Relaxation_debug_check methods. |
| 57 | |
| 58 | // Check that sections and special data are in reset states. |
| 59 | // We do not save states for Output_sections and special Output_data. |
| 60 | // So we check that they have not assigned any addresses or offsets. |
| 61 | // clean_up_after_relaxation simply resets their addresses and offsets. |
| 62 | void |
| 63 | Layout::Relaxation_debug_check::check_output_data_for_reset_values( |
| 64 | const Layout::Section_list& sections, |
| 65 | const Layout::Data_list& special_outputs) |
| 66 | { |
| 67 | for(Layout::Section_list::const_iterator p = sections.begin(); |
| 68 | p != sections.end(); |
| 69 | ++p) |
| 70 | gold_assert((*p)->address_and_file_offset_have_reset_values()); |
| 71 | |
| 72 | for(Layout::Data_list::const_iterator p = special_outputs.begin(); |
| 73 | p != special_outputs.end(); |
| 74 | ++p) |
| 75 | gold_assert((*p)->address_and_file_offset_have_reset_values()); |
| 76 | } |
| 77 | |
| 78 | // Save information of SECTIONS for checking later. |
| 79 | |
| 80 | void |
| 81 | Layout::Relaxation_debug_check::read_sections( |
| 82 | const Layout::Section_list& sections) |
| 83 | { |
| 84 | for(Layout::Section_list::const_iterator p = sections.begin(); |
| 85 | p != sections.end(); |
| 86 | ++p) |
| 87 | { |
| 88 | Output_section* os = *p; |
| 89 | Section_info info; |
| 90 | info.output_section = os; |
| 91 | info.address = os->is_address_valid() ? os->address() : 0; |
| 92 | info.data_size = os->is_data_size_valid() ? os->data_size() : -1; |
| 93 | info.offset = os->is_offset_valid()? os->offset() : -1 ; |
| 94 | this->section_infos_.push_back(info); |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | // Verify SECTIONS using previously recorded information. |
| 99 | |
| 100 | void |
| 101 | Layout::Relaxation_debug_check::verify_sections( |
| 102 | const Layout::Section_list& sections) |
| 103 | { |
| 104 | size_t i = 0; |
| 105 | for(Layout::Section_list::const_iterator p = sections.begin(); |
| 106 | p != sections.end(); |
| 107 | ++p, ++i) |
| 108 | { |
| 109 | Output_section* os = *p; |
| 110 | uint64_t address = os->is_address_valid() ? os->address() : 0; |
| 111 | off_t data_size = os->is_data_size_valid() ? os->data_size() : -1; |
| 112 | off_t offset = os->is_offset_valid()? os->offset() : -1 ; |
| 113 | |
| 114 | if (i >= this->section_infos_.size()) |
| 115 | { |
| 116 | gold_fatal("Section_info of %s missing.\n", os->name()); |
| 117 | } |
| 118 | const Section_info& info = this->section_infos_[i]; |
| 119 | if (os != info.output_section) |
| 120 | gold_fatal("Section order changed. Expecting %s but see %s\n", |
| 121 | info.output_section->name(), os->name()); |
| 122 | if (address != info.address |
| 123 | || data_size != info.data_size |
| 124 | || offset != info.offset) |
| 125 | gold_fatal("Section %s changed.\n", os->name()); |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | // Layout_task_runner methods. |
| 130 | |
| 131 | // Lay out the sections. This is called after all the input objects |
| 132 | // have been read. |
| 133 | |
| 134 | void |
| 135 | Layout_task_runner::run(Workqueue* workqueue, const Task* task) |
| 136 | { |
| 137 | off_t file_size = this->layout_->finalize(this->input_objects_, |
| 138 | this->symtab_, |
| 139 | this->target_, |
| 140 | task); |
| 141 | |
| 142 | // Now we know the final size of the output file and we know where |
| 143 | // each piece of information goes. |
| 144 | |
| 145 | if (this->mapfile_ != NULL) |
| 146 | { |
| 147 | this->mapfile_->print_discarded_sections(this->input_objects_); |
| 148 | this->layout_->print_to_mapfile(this->mapfile_); |
| 149 | } |
| 150 | |
| 151 | Output_file* of = new Output_file(parameters->options().output_file_name()); |
| 152 | if (this->options_.oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
| 153 | of->set_is_temporary(); |
| 154 | of->open(file_size); |
| 155 | |
| 156 | // Queue up the final set of tasks. |
| 157 | gold::queue_final_tasks(this->options_, this->input_objects_, |
| 158 | this->symtab_, this->layout_, workqueue, of); |
| 159 | } |
| 160 | |
| 161 | // Layout methods. |
| 162 | |
| 163 | Layout::Layout(int number_of_input_files, Script_options* script_options) |
| 164 | : number_of_input_files_(number_of_input_files), |
| 165 | script_options_(script_options), |
| 166 | namepool_(), |
| 167 | sympool_(), |
| 168 | dynpool_(), |
| 169 | signatures_(), |
| 170 | section_name_map_(), |
| 171 | segment_list_(), |
| 172 | section_list_(), |
| 173 | unattached_section_list_(), |
| 174 | special_output_list_(), |
| 175 | section_headers_(NULL), |
| 176 | tls_segment_(NULL), |
| 177 | relro_segment_(NULL), |
| 178 | increase_relro_(0), |
| 179 | symtab_section_(NULL), |
| 180 | symtab_xindex_(NULL), |
| 181 | dynsym_section_(NULL), |
| 182 | dynsym_xindex_(NULL), |
| 183 | dynamic_section_(NULL), |
| 184 | dynamic_symbol_(NULL), |
| 185 | dynamic_data_(NULL), |
| 186 | eh_frame_section_(NULL), |
| 187 | eh_frame_data_(NULL), |
| 188 | added_eh_frame_data_(false), |
| 189 | eh_frame_hdr_section_(NULL), |
| 190 | build_id_note_(NULL), |
| 191 | debug_abbrev_(NULL), |
| 192 | debug_info_(NULL), |
| 193 | group_signatures_(), |
| 194 | output_file_size_(-1), |
| 195 | have_added_input_section_(false), |
| 196 | sections_are_attached_(false), |
| 197 | input_requires_executable_stack_(false), |
| 198 | input_with_gnu_stack_note_(false), |
| 199 | input_without_gnu_stack_note_(false), |
| 200 | has_static_tls_(false), |
| 201 | any_postprocessing_sections_(false), |
| 202 | resized_signatures_(false), |
| 203 | have_stabstr_section_(false), |
| 204 | incremental_inputs_(NULL), |
| 205 | record_output_section_data_from_script_(false), |
| 206 | script_output_section_data_list_(), |
| 207 | segment_states_(NULL), |
| 208 | relaxation_debug_check_(NULL) |
| 209 | { |
| 210 | // Make space for more than enough segments for a typical file. |
| 211 | // This is just for efficiency--it's OK if we wind up needing more. |
| 212 | this->segment_list_.reserve(12); |
| 213 | |
| 214 | // We expect two unattached Output_data objects: the file header and |
| 215 | // the segment headers. |
| 216 | this->special_output_list_.reserve(2); |
| 217 | |
| 218 | // Initialize structure needed for an incremental build. |
| 219 | if (parameters->options().incremental()) |
| 220 | this->incremental_inputs_ = new Incremental_inputs; |
| 221 | |
| 222 | // The section name pool is worth optimizing in all cases, because |
| 223 | // it is small, but there are often overlaps due to .rel sections. |
| 224 | this->namepool_.set_optimize(); |
| 225 | } |
| 226 | |
| 227 | // Hash a key we use to look up an output section mapping. |
| 228 | |
| 229 | size_t |
| 230 | Layout::Hash_key::operator()(const Layout::Key& k) const |
| 231 | { |
| 232 | return k.first + k.second.first + k.second.second; |
| 233 | } |
| 234 | |
| 235 | // Returns whether the given section is in the list of |
| 236 | // debug-sections-used-by-some-version-of-gdb. Currently, |
| 237 | // we've checked versions of gdb up to and including 6.7.1. |
| 238 | |
| 239 | static const char* gdb_sections[] = |
| 240 | { ".debug_abbrev", |
| 241 | // ".debug_aranges", // not used by gdb as of 6.7.1 |
| 242 | ".debug_frame", |
| 243 | ".debug_info", |
| 244 | ".debug_line", |
| 245 | ".debug_loc", |
| 246 | ".debug_macinfo", |
| 247 | // ".debug_pubnames", // not used by gdb as of 6.7.1 |
| 248 | ".debug_ranges", |
| 249 | ".debug_str", |
| 250 | }; |
| 251 | |
| 252 | static const char* lines_only_debug_sections[] = |
| 253 | { ".debug_abbrev", |
| 254 | // ".debug_aranges", // not used by gdb as of 6.7.1 |
| 255 | // ".debug_frame", |
| 256 | ".debug_info", |
| 257 | ".debug_line", |
| 258 | // ".debug_loc", |
| 259 | // ".debug_macinfo", |
| 260 | // ".debug_pubnames", // not used by gdb as of 6.7.1 |
| 261 | // ".debug_ranges", |
| 262 | ".debug_str", |
| 263 | }; |
| 264 | |
| 265 | static inline bool |
| 266 | is_gdb_debug_section(const char* str) |
| 267 | { |
| 268 | // We can do this faster: binary search or a hashtable. But why bother? |
| 269 | for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i) |
| 270 | if (strcmp(str, gdb_sections[i]) == 0) |
| 271 | return true; |
| 272 | return false; |
| 273 | } |
| 274 | |
| 275 | static inline bool |
| 276 | is_lines_only_debug_section(const char* str) |
| 277 | { |
| 278 | // We can do this faster: binary search or a hashtable. But why bother? |
| 279 | for (size_t i = 0; |
| 280 | i < sizeof(lines_only_debug_sections)/sizeof(*lines_only_debug_sections); |
| 281 | ++i) |
| 282 | if (strcmp(str, lines_only_debug_sections[i]) == 0) |
| 283 | return true; |
| 284 | return false; |
| 285 | } |
| 286 | |
| 287 | // Whether to include this section in the link. |
| 288 | |
| 289 | template<int size, bool big_endian> |
| 290 | bool |
| 291 | Layout::include_section(Sized_relobj<size, big_endian>*, const char* name, |
| 292 | const elfcpp::Shdr<size, big_endian>& shdr) |
| 293 | { |
| 294 | if (shdr.get_sh_flags() & elfcpp::SHF_EXCLUDE) |
| 295 | return false; |
| 296 | |
| 297 | switch (shdr.get_sh_type()) |
| 298 | { |
| 299 | case elfcpp::SHT_NULL: |
| 300 | case elfcpp::SHT_SYMTAB: |
| 301 | case elfcpp::SHT_DYNSYM: |
| 302 | case elfcpp::SHT_HASH: |
| 303 | case elfcpp::SHT_DYNAMIC: |
| 304 | case elfcpp::SHT_SYMTAB_SHNDX: |
| 305 | return false; |
| 306 | |
| 307 | case elfcpp::SHT_STRTAB: |
| 308 | // Discard the sections which have special meanings in the ELF |
| 309 | // ABI. Keep others (e.g., .stabstr). We could also do this by |
| 310 | // checking the sh_link fields of the appropriate sections. |
| 311 | return (strcmp(name, ".dynstr") != 0 |
| 312 | && strcmp(name, ".strtab") != 0 |
| 313 | && strcmp(name, ".shstrtab") != 0); |
| 314 | |
| 315 | case elfcpp::SHT_RELA: |
| 316 | case elfcpp::SHT_REL: |
| 317 | case elfcpp::SHT_GROUP: |
| 318 | // If we are emitting relocations these should be handled |
| 319 | // elsewhere. |
| 320 | gold_assert(!parameters->options().relocatable() |
| 321 | && !parameters->options().emit_relocs()); |
| 322 | return false; |
| 323 | |
| 324 | case elfcpp::SHT_PROGBITS: |
| 325 | if (parameters->options().strip_debug() |
| 326 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
| 327 | { |
| 328 | if (is_debug_info_section(name)) |
| 329 | return false; |
| 330 | } |
| 331 | if (parameters->options().strip_debug_non_line() |
| 332 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
| 333 | { |
| 334 | // Debugging sections can only be recognized by name. |
| 335 | if (is_prefix_of(".debug", name) |
| 336 | && !is_lines_only_debug_section(name)) |
| 337 | return false; |
| 338 | } |
| 339 | if (parameters->options().strip_debug_gdb() |
| 340 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
| 341 | { |
| 342 | // Debugging sections can only be recognized by name. |
| 343 | if (is_prefix_of(".debug", name) |
| 344 | && !is_gdb_debug_section(name)) |
| 345 | return false; |
| 346 | } |
| 347 | if (parameters->options().strip_lto_sections() |
| 348 | && !parameters->options().relocatable() |
| 349 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
| 350 | { |
| 351 | // Ignore LTO sections containing intermediate code. |
| 352 | if (is_prefix_of(".gnu.lto_", name)) |
| 353 | return false; |
| 354 | } |
| 355 | return true; |
| 356 | |
| 357 | default: |
| 358 | return true; |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | // Return an output section named NAME, or NULL if there is none. |
| 363 | |
| 364 | Output_section* |
| 365 | Layout::find_output_section(const char* name) const |
| 366 | { |
| 367 | for (Section_list::const_iterator p = this->section_list_.begin(); |
| 368 | p != this->section_list_.end(); |
| 369 | ++p) |
| 370 | if (strcmp((*p)->name(), name) == 0) |
| 371 | return *p; |
| 372 | return NULL; |
| 373 | } |
| 374 | |
| 375 | // Return an output segment of type TYPE, with segment flags SET set |
| 376 | // and segment flags CLEAR clear. Return NULL if there is none. |
| 377 | |
| 378 | Output_segment* |
| 379 | Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, |
| 380 | elfcpp::Elf_Word clear) const |
| 381 | { |
| 382 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
| 383 | p != this->segment_list_.end(); |
| 384 | ++p) |
| 385 | if (static_cast<elfcpp::PT>((*p)->type()) == type |
| 386 | && ((*p)->flags() & set) == set |
| 387 | && ((*p)->flags() & clear) == 0) |
| 388 | return *p; |
| 389 | return NULL; |
| 390 | } |
| 391 | |
| 392 | // Return the output section to use for section NAME with type TYPE |
| 393 | // and section flags FLAGS. NAME must be canonicalized in the string |
| 394 | // pool, and NAME_KEY is the key. IS_INTERP is true if this is the |
| 395 | // .interp section. IS_DYNAMIC_LINKER_SECTION is true if this section |
| 396 | // is used by the dynamic linker. IS_RELRO is true for a relro |
| 397 | // section. IS_LAST_RELRO is true for the last relro section. |
| 398 | // IS_FIRST_NON_RELRO is true for the first non-relro section. |
| 399 | |
| 400 | Output_section* |
| 401 | Layout::get_output_section(const char* name, Stringpool::Key name_key, |
| 402 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, |
| 403 | bool is_interp, bool is_dynamic_linker_section, |
| 404 | bool is_relro, bool is_last_relro, |
| 405 | bool is_first_non_relro) |
| 406 | { |
| 407 | elfcpp::Elf_Xword lookup_flags = flags; |
| 408 | |
| 409 | // Ignoring SHF_WRITE and SHF_EXECINSTR here means that we combine |
| 410 | // read-write with read-only sections. Some other ELF linkers do |
| 411 | // not do this. FIXME: Perhaps there should be an option |
| 412 | // controlling this. |
| 413 | lookup_flags &= ~(elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); |
| 414 | |
| 415 | const Key key(name_key, std::make_pair(type, lookup_flags)); |
| 416 | const std::pair<Key, Output_section*> v(key, NULL); |
| 417 | std::pair<Section_name_map::iterator, bool> ins( |
| 418 | this->section_name_map_.insert(v)); |
| 419 | |
| 420 | if (!ins.second) |
| 421 | return ins.first->second; |
| 422 | else |
| 423 | { |
| 424 | // This is the first time we've seen this name/type/flags |
| 425 | // combination. For compatibility with the GNU linker, we |
| 426 | // combine sections with contents and zero flags with sections |
| 427 | // with non-zero flags. This is a workaround for cases where |
| 428 | // assembler code forgets to set section flags. FIXME: Perhaps |
| 429 | // there should be an option to control this. |
| 430 | Output_section* os = NULL; |
| 431 | |
| 432 | if (type == elfcpp::SHT_PROGBITS) |
| 433 | { |
| 434 | if (flags == 0) |
| 435 | { |
| 436 | Output_section* same_name = this->find_output_section(name); |
| 437 | if (same_name != NULL |
| 438 | && same_name->type() == elfcpp::SHT_PROGBITS |
| 439 | && (same_name->flags() & elfcpp::SHF_TLS) == 0) |
| 440 | os = same_name; |
| 441 | } |
| 442 | else if ((flags & elfcpp::SHF_TLS) == 0) |
| 443 | { |
| 444 | elfcpp::Elf_Xword zero_flags = 0; |
| 445 | const Key zero_key(name_key, std::make_pair(type, zero_flags)); |
| 446 | Section_name_map::iterator p = |
| 447 | this->section_name_map_.find(zero_key); |
| 448 | if (p != this->section_name_map_.end()) |
| 449 | os = p->second; |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | if (os == NULL) |
| 454 | os = this->make_output_section(name, type, flags, is_interp, |
| 455 | is_dynamic_linker_section, is_relro, |
| 456 | is_last_relro, is_first_non_relro); |
| 457 | ins.first->second = os; |
| 458 | return os; |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | // Pick the output section to use for section NAME, in input file |
| 463 | // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a |
| 464 | // linker created section. IS_INPUT_SECTION is true if we are |
| 465 | // choosing an output section for an input section found in a input |
| 466 | // file. IS_INTERP is true if this is the .interp section. |
| 467 | // IS_DYNAMIC_LINKER_SECTION is true if this section is used by the |
| 468 | // dynamic linker. IS_RELRO is true for a relro section. |
| 469 | // IS_LAST_RELRO is true for the last relro section. |
| 470 | // IS_FIRST_NON_RELRO is true for the first non-relro section. This |
| 471 | // will return NULL if the input section should be discarded. |
| 472 | |
| 473 | Output_section* |
| 474 | Layout::choose_output_section(const Relobj* relobj, const char* name, |
| 475 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, |
| 476 | bool is_input_section, bool is_interp, |
| 477 | bool is_dynamic_linker_section, bool is_relro, |
| 478 | bool is_last_relro, bool is_first_non_relro) |
| 479 | { |
| 480 | // We should not see any input sections after we have attached |
| 481 | // sections to segments. |
| 482 | gold_assert(!is_input_section || !this->sections_are_attached_); |
| 483 | |
| 484 | // Some flags in the input section should not be automatically |
| 485 | // copied to the output section. |
| 486 | flags &= ~ (elfcpp::SHF_INFO_LINK |
| 487 | | elfcpp::SHF_LINK_ORDER |
| 488 | | elfcpp::SHF_GROUP |
| 489 | | elfcpp::SHF_MERGE |
| 490 | | elfcpp::SHF_STRINGS); |
| 491 | |
| 492 | if (this->script_options_->saw_sections_clause()) |
| 493 | { |
| 494 | // We are using a SECTIONS clause, so the output section is |
| 495 | // chosen based only on the name. |
| 496 | |
| 497 | Script_sections* ss = this->script_options_->script_sections(); |
| 498 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); |
| 499 | Output_section** output_section_slot; |
| 500 | name = ss->output_section_name(file_name, name, &output_section_slot); |
| 501 | if (name == NULL) |
| 502 | { |
| 503 | // The SECTIONS clause says to discard this input section. |
| 504 | return NULL; |
| 505 | } |
| 506 | |
| 507 | // If this is an orphan section--one not mentioned in the linker |
| 508 | // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the |
| 509 | // default processing below. |
| 510 | |
| 511 | if (output_section_slot != NULL) |
| 512 | { |
| 513 | if (*output_section_slot != NULL) |
| 514 | { |
| 515 | (*output_section_slot)->update_flags_for_input_section(flags); |
| 516 | return *output_section_slot; |
| 517 | } |
| 518 | |
| 519 | // We don't put sections found in the linker script into |
| 520 | // SECTION_NAME_MAP_. That keeps us from getting confused |
| 521 | // if an orphan section is mapped to a section with the same |
| 522 | // name as one in the linker script. |
| 523 | |
| 524 | name = this->namepool_.add(name, false, NULL); |
| 525 | |
| 526 | Output_section* os = |
| 527 | this->make_output_section(name, type, flags, is_interp, |
| 528 | is_dynamic_linker_section, is_relro, |
| 529 | is_last_relro, is_first_non_relro); |
| 530 | os->set_found_in_sections_clause(); |
| 531 | *output_section_slot = os; |
| 532 | return os; |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | // FIXME: Handle SHF_OS_NONCONFORMING somewhere. |
| 537 | |
| 538 | // Turn NAME from the name of the input section into the name of the |
| 539 | // output section. |
| 540 | |
| 541 | size_t len = strlen(name); |
| 542 | if (is_input_section |
| 543 | && !this->script_options_->saw_sections_clause() |
| 544 | && !parameters->options().relocatable()) |
| 545 | name = Layout::output_section_name(name, &len); |
| 546 | |
| 547 | Stringpool::Key name_key; |
| 548 | name = this->namepool_.add_with_length(name, len, true, &name_key); |
| 549 | |
| 550 | // Find or make the output section. The output section is selected |
| 551 | // based on the section name, type, and flags. |
| 552 | return this->get_output_section(name, name_key, type, flags, is_interp, |
| 553 | is_dynamic_linker_section, is_relro, |
| 554 | is_last_relro, is_first_non_relro); |
| 555 | } |
| 556 | |
| 557 | // Return the output section to use for input section SHNDX, with name |
| 558 | // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the |
| 559 | // index of a relocation section which applies to this section, or 0 |
| 560 | // if none, or -1U if more than one. RELOC_TYPE is the type of the |
| 561 | // relocation section if there is one. Set *OFF to the offset of this |
| 562 | // input section without the output section. Return NULL if the |
| 563 | // section should be discarded. Set *OFF to -1 if the section |
| 564 | // contents should not be written directly to the output file, but |
| 565 | // will instead receive special handling. |
| 566 | |
| 567 | template<int size, bool big_endian> |
| 568 | Output_section* |
| 569 | Layout::layout(Sized_relobj<size, big_endian>* object, unsigned int shndx, |
| 570 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, |
| 571 | unsigned int reloc_shndx, unsigned int, off_t* off) |
| 572 | { |
| 573 | *off = 0; |
| 574 | |
| 575 | if (!this->include_section(object, name, shdr)) |
| 576 | return NULL; |
| 577 | |
| 578 | Output_section* os; |
| 579 | |
| 580 | // In a relocatable link a grouped section must not be combined with |
| 581 | // any other sections. |
| 582 | if (parameters->options().relocatable() |
| 583 | && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0) |
| 584 | { |
| 585 | name = this->namepool_.add(name, true, NULL); |
| 586 | os = this->make_output_section(name, shdr.get_sh_type(), |
| 587 | shdr.get_sh_flags(), false, false, |
| 588 | false, false, false); |
| 589 | } |
| 590 | else |
| 591 | { |
| 592 | os = this->choose_output_section(object, name, shdr.get_sh_type(), |
| 593 | shdr.get_sh_flags(), true, false, |
| 594 | false, false, false, false); |
| 595 | if (os == NULL) |
| 596 | return NULL; |
| 597 | } |
| 598 | |
| 599 | // By default the GNU linker sorts input sections whose names match |
| 600 | // .ctor.*, .dtor.*, .init_array.*, or .fini_array.*. The sections |
| 601 | // are sorted by name. This is used to implement constructor |
| 602 | // priority ordering. We are compatible. |
| 603 | if (!this->script_options_->saw_sections_clause() |
| 604 | && (is_prefix_of(".ctors.", name) |
| 605 | || is_prefix_of(".dtors.", name) |
| 606 | || is_prefix_of(".init_array.", name) |
| 607 | || is_prefix_of(".fini_array.", name))) |
| 608 | os->set_must_sort_attached_input_sections(); |
| 609 | |
| 610 | // FIXME: Handle SHF_LINK_ORDER somewhere. |
| 611 | |
| 612 | *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx, |
| 613 | this->script_options_->saw_sections_clause()); |
| 614 | this->have_added_input_section_ = true; |
| 615 | |
| 616 | return os; |
| 617 | } |
| 618 | |
| 619 | // Handle a relocation section when doing a relocatable link. |
| 620 | |
| 621 | template<int size, bool big_endian> |
| 622 | Output_section* |
| 623 | Layout::layout_reloc(Sized_relobj<size, big_endian>* object, |
| 624 | unsigned int, |
| 625 | const elfcpp::Shdr<size, big_endian>& shdr, |
| 626 | Output_section* data_section, |
| 627 | Relocatable_relocs* rr) |
| 628 | { |
| 629 | gold_assert(parameters->options().relocatable() |
| 630 | || parameters->options().emit_relocs()); |
| 631 | |
| 632 | int sh_type = shdr.get_sh_type(); |
| 633 | |
| 634 | std::string name; |
| 635 | if (sh_type == elfcpp::SHT_REL) |
| 636 | name = ".rel"; |
| 637 | else if (sh_type == elfcpp::SHT_RELA) |
| 638 | name = ".rela"; |
| 639 | else |
| 640 | gold_unreachable(); |
| 641 | name += data_section->name(); |
| 642 | |
| 643 | Output_section* os = this->choose_output_section(object, name.c_str(), |
| 644 | sh_type, |
| 645 | shdr.get_sh_flags(), |
| 646 | false, false, false, |
| 647 | false, false, false); |
| 648 | |
| 649 | os->set_should_link_to_symtab(); |
| 650 | os->set_info_section(data_section); |
| 651 | |
| 652 | Output_section_data* posd; |
| 653 | if (sh_type == elfcpp::SHT_REL) |
| 654 | { |
| 655 | os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); |
| 656 | posd = new Output_relocatable_relocs<elfcpp::SHT_REL, |
| 657 | size, |
| 658 | big_endian>(rr); |
| 659 | } |
| 660 | else if (sh_type == elfcpp::SHT_RELA) |
| 661 | { |
| 662 | os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); |
| 663 | posd = new Output_relocatable_relocs<elfcpp::SHT_RELA, |
| 664 | size, |
| 665 | big_endian>(rr); |
| 666 | } |
| 667 | else |
| 668 | gold_unreachable(); |
| 669 | |
| 670 | os->add_output_section_data(posd); |
| 671 | rr->set_output_data(posd); |
| 672 | |
| 673 | return os; |
| 674 | } |
| 675 | |
| 676 | // Handle a group section when doing a relocatable link. |
| 677 | |
| 678 | template<int size, bool big_endian> |
| 679 | void |
| 680 | Layout::layout_group(Symbol_table* symtab, |
| 681 | Sized_relobj<size, big_endian>* object, |
| 682 | unsigned int, |
| 683 | const char* group_section_name, |
| 684 | const char* signature, |
| 685 | const elfcpp::Shdr<size, big_endian>& shdr, |
| 686 | elfcpp::Elf_Word flags, |
| 687 | std::vector<unsigned int>* shndxes) |
| 688 | { |
| 689 | gold_assert(parameters->options().relocatable()); |
| 690 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP); |
| 691 | group_section_name = this->namepool_.add(group_section_name, true, NULL); |
| 692 | Output_section* os = this->make_output_section(group_section_name, |
| 693 | elfcpp::SHT_GROUP, |
| 694 | shdr.get_sh_flags(), |
| 695 | false, false, false, |
| 696 | false, false); |
| 697 | |
| 698 | // We need to find a symbol with the signature in the symbol table. |
| 699 | // If we don't find one now, we need to look again later. |
| 700 | Symbol* sym = symtab->lookup(signature, NULL); |
| 701 | if (sym != NULL) |
| 702 | os->set_info_symndx(sym); |
| 703 | else |
| 704 | { |
| 705 | // Reserve some space to minimize reallocations. |
| 706 | if (this->group_signatures_.empty()) |
| 707 | this->group_signatures_.reserve(this->number_of_input_files_ * 16); |
| 708 | |
| 709 | // We will wind up using a symbol whose name is the signature. |
| 710 | // So just put the signature in the symbol name pool to save it. |
| 711 | signature = symtab->canonicalize_name(signature); |
| 712 | this->group_signatures_.push_back(Group_signature(os, signature)); |
| 713 | } |
| 714 | |
| 715 | os->set_should_link_to_symtab(); |
| 716 | os->set_entsize(4); |
| 717 | |
| 718 | section_size_type entry_count = |
| 719 | convert_to_section_size_type(shdr.get_sh_size() / 4); |
| 720 | Output_section_data* posd = |
| 721 | new Output_data_group<size, big_endian>(object, entry_count, flags, |
| 722 | shndxes); |
| 723 | os->add_output_section_data(posd); |
| 724 | } |
| 725 | |
| 726 | // Special GNU handling of sections name .eh_frame. They will |
| 727 | // normally hold exception frame data as defined by the C++ ABI |
| 728 | // (http://codesourcery.com/cxx-abi/). |
| 729 | |
| 730 | template<int size, bool big_endian> |
| 731 | Output_section* |
| 732 | Layout::layout_eh_frame(Sized_relobj<size, big_endian>* object, |
| 733 | const unsigned char* symbols, |
| 734 | off_t symbols_size, |
| 735 | const unsigned char* symbol_names, |
| 736 | off_t symbol_names_size, |
| 737 | unsigned int shndx, |
| 738 | const elfcpp::Shdr<size, big_endian>& shdr, |
| 739 | unsigned int reloc_shndx, unsigned int reloc_type, |
| 740 | off_t* off) |
| 741 | { |
| 742 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS); |
| 743 | gold_assert((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
| 744 | |
| 745 | const char* const name = ".eh_frame"; |
| 746 | Output_section* os = this->choose_output_section(object, |
| 747 | name, |
| 748 | elfcpp::SHT_PROGBITS, |
| 749 | elfcpp::SHF_ALLOC, |
| 750 | false, false, false, |
| 751 | false, false, false); |
| 752 | if (os == NULL) |
| 753 | return NULL; |
| 754 | |
| 755 | if (this->eh_frame_section_ == NULL) |
| 756 | { |
| 757 | this->eh_frame_section_ = os; |
| 758 | this->eh_frame_data_ = new Eh_frame(); |
| 759 | |
| 760 | if (parameters->options().eh_frame_hdr()) |
| 761 | { |
| 762 | Output_section* hdr_os = |
| 763 | this->choose_output_section(NULL, |
| 764 | ".eh_frame_hdr", |
| 765 | elfcpp::SHT_PROGBITS, |
| 766 | elfcpp::SHF_ALLOC, |
| 767 | false, false, false, |
| 768 | false, false, false); |
| 769 | |
| 770 | if (hdr_os != NULL) |
| 771 | { |
| 772 | Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, |
| 773 | this->eh_frame_data_); |
| 774 | hdr_os->add_output_section_data(hdr_posd); |
| 775 | |
| 776 | hdr_os->set_after_input_sections(); |
| 777 | |
| 778 | if (!this->script_options_->saw_phdrs_clause()) |
| 779 | { |
| 780 | Output_segment* hdr_oseg; |
| 781 | hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME, |
| 782 | elfcpp::PF_R); |
| 783 | hdr_oseg->add_output_section(hdr_os, elfcpp::PF_R, false); |
| 784 | } |
| 785 | |
| 786 | this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); |
| 787 | } |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | gold_assert(this->eh_frame_section_ == os); |
| 792 | |
| 793 | if (this->eh_frame_data_->add_ehframe_input_section(object, |
| 794 | symbols, |
| 795 | symbols_size, |
| 796 | symbol_names, |
| 797 | symbol_names_size, |
| 798 | shndx, |
| 799 | reloc_shndx, |
| 800 | reloc_type)) |
| 801 | { |
| 802 | os->update_flags_for_input_section(shdr.get_sh_flags()); |
| 803 | |
| 804 | // We found a .eh_frame section we are going to optimize, so now |
| 805 | // we can add the set of optimized sections to the output |
| 806 | // section. We need to postpone adding this until we've found a |
| 807 | // section we can optimize so that the .eh_frame section in |
| 808 | // crtbegin.o winds up at the start of the output section. |
| 809 | if (!this->added_eh_frame_data_) |
| 810 | { |
| 811 | os->add_output_section_data(this->eh_frame_data_); |
| 812 | this->added_eh_frame_data_ = true; |
| 813 | } |
| 814 | *off = -1; |
| 815 | } |
| 816 | else |
| 817 | { |
| 818 | // We couldn't handle this .eh_frame section for some reason. |
| 819 | // Add it as a normal section. |
| 820 | bool saw_sections_clause = this->script_options_->saw_sections_clause(); |
| 821 | *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx, |
| 822 | saw_sections_clause); |
| 823 | this->have_added_input_section_ = true; |
| 824 | } |
| 825 | |
| 826 | return os; |
| 827 | } |
| 828 | |
| 829 | // Add POSD to an output section using NAME, TYPE, and FLAGS. Return |
| 830 | // the output section. |
| 831 | |
| 832 | Output_section* |
| 833 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, |
| 834 | elfcpp::Elf_Xword flags, |
| 835 | Output_section_data* posd, |
| 836 | bool is_dynamic_linker_section, |
| 837 | bool is_relro, bool is_last_relro, |
| 838 | bool is_first_non_relro) |
| 839 | { |
| 840 | Output_section* os = this->choose_output_section(NULL, name, type, flags, |
| 841 | false, false, |
| 842 | is_dynamic_linker_section, |
| 843 | is_relro, is_last_relro, |
| 844 | is_first_non_relro); |
| 845 | if (os != NULL) |
| 846 | os->add_output_section_data(posd); |
| 847 | return os; |
| 848 | } |
| 849 | |
| 850 | // Map section flags to segment flags. |
| 851 | |
| 852 | elfcpp::Elf_Word |
| 853 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) |
| 854 | { |
| 855 | elfcpp::Elf_Word ret = elfcpp::PF_R; |
| 856 | if ((flags & elfcpp::SHF_WRITE) != 0) |
| 857 | ret |= elfcpp::PF_W; |
| 858 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) |
| 859 | ret |= elfcpp::PF_X; |
| 860 | return ret; |
| 861 | } |
| 862 | |
| 863 | // Sometimes we compress sections. This is typically done for |
| 864 | // sections that are not part of normal program execution (such as |
| 865 | // .debug_* sections), and where the readers of these sections know |
| 866 | // how to deal with compressed sections. This routine doesn't say for |
| 867 | // certain whether we'll compress -- it depends on commandline options |
| 868 | // as well -- just whether this section is a candidate for compression. |
| 869 | // (The Output_compressed_section class decides whether to compress |
| 870 | // a given section, and picks the name of the compressed section.) |
| 871 | |
| 872 | static bool |
| 873 | is_compressible_debug_section(const char* secname) |
| 874 | { |
| 875 | return (strncmp(secname, ".debug", sizeof(".debug") - 1) == 0); |
| 876 | } |
| 877 | |
| 878 | // Make a new Output_section, and attach it to segments as |
| 879 | // appropriate. IS_INTERP is true if this is the .interp section. |
| 880 | // IS_DYNAMIC_LINKER_SECTION is true if this section is used by the |
| 881 | // dynamic linker. IS_RELRO is true if this is a relro section. |
| 882 | // IS_LAST_RELRO is true if this is the last relro section. |
| 883 | // IS_FIRST_NON_RELRO is true if this is the first non relro section. |
| 884 | |
| 885 | Output_section* |
| 886 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, |
| 887 | elfcpp::Elf_Xword flags, bool is_interp, |
| 888 | bool is_dynamic_linker_section, bool is_relro, |
| 889 | bool is_last_relro, bool is_first_non_relro) |
| 890 | { |
| 891 | Output_section* os; |
| 892 | if ((flags & elfcpp::SHF_ALLOC) == 0 |
| 893 | && strcmp(parameters->options().compress_debug_sections(), "none") != 0 |
| 894 | && is_compressible_debug_section(name)) |
| 895 | os = new Output_compressed_section(¶meters->options(), name, type, |
| 896 | flags); |
| 897 | else if ((flags & elfcpp::SHF_ALLOC) == 0 |
| 898 | && parameters->options().strip_debug_non_line() |
| 899 | && strcmp(".debug_abbrev", name) == 0) |
| 900 | { |
| 901 | os = this->debug_abbrev_ = new Output_reduced_debug_abbrev_section( |
| 902 | name, type, flags); |
| 903 | if (this->debug_info_) |
| 904 | this->debug_info_->set_abbreviations(this->debug_abbrev_); |
| 905 | } |
| 906 | else if ((flags & elfcpp::SHF_ALLOC) == 0 |
| 907 | && parameters->options().strip_debug_non_line() |
| 908 | && strcmp(".debug_info", name) == 0) |
| 909 | { |
| 910 | os = this->debug_info_ = new Output_reduced_debug_info_section( |
| 911 | name, type, flags); |
| 912 | if (this->debug_abbrev_) |
| 913 | this->debug_info_->set_abbreviations(this->debug_abbrev_); |
| 914 | } |
| 915 | else |
| 916 | { |
| 917 | // FIXME: const_cast is ugly. |
| 918 | Target* target = const_cast<Target*>(¶meters->target()); |
| 919 | os = target->make_output_section(name, type, flags); |
| 920 | } |
| 921 | |
| 922 | if (is_interp) |
| 923 | os->set_is_interp(); |
| 924 | if (is_dynamic_linker_section) |
| 925 | os->set_is_dynamic_linker_section(); |
| 926 | if (is_relro) |
| 927 | os->set_is_relro(); |
| 928 | if (is_last_relro) |
| 929 | os->set_is_last_relro(); |
| 930 | if (is_first_non_relro) |
| 931 | os->set_is_first_non_relro(); |
| 932 | |
| 933 | parameters->target().new_output_section(os); |
| 934 | |
| 935 | this->section_list_.push_back(os); |
| 936 | |
| 937 | // The GNU linker by default sorts some sections by priority, so we |
| 938 | // do the same. We need to know that this might happen before we |
| 939 | // attach any input sections. |
| 940 | if (!this->script_options_->saw_sections_clause() |
| 941 | && (strcmp(name, ".ctors") == 0 |
| 942 | || strcmp(name, ".dtors") == 0 |
| 943 | || strcmp(name, ".init_array") == 0 |
| 944 | || strcmp(name, ".fini_array") == 0)) |
| 945 | os->set_may_sort_attached_input_sections(); |
| 946 | |
| 947 | // With -z relro, we have to recognize the special sections by name. |
| 948 | // There is no other way. |
| 949 | if (!this->script_options_->saw_sections_clause() |
| 950 | && parameters->options().relro() |
| 951 | && type == elfcpp::SHT_PROGBITS |
| 952 | && (flags & elfcpp::SHF_ALLOC) != 0 |
| 953 | && (flags & elfcpp::SHF_WRITE) != 0) |
| 954 | { |
| 955 | if (strcmp(name, ".data.rel.ro") == 0) |
| 956 | os->set_is_relro(); |
| 957 | else if (strcmp(name, ".data.rel.ro.local") == 0) |
| 958 | { |
| 959 | os->set_is_relro(); |
| 960 | os->set_is_relro_local(); |
| 961 | } |
| 962 | } |
| 963 | |
| 964 | // Check for .stab*str sections, as .stab* sections need to link to |
| 965 | // them. |
| 966 | if (type == elfcpp::SHT_STRTAB |
| 967 | && !this->have_stabstr_section_ |
| 968 | && strncmp(name, ".stab", 5) == 0 |
| 969 | && strcmp(name + strlen(name) - 3, "str") == 0) |
| 970 | this->have_stabstr_section_ = true; |
| 971 | |
| 972 | // If we have already attached the sections to segments, then we |
| 973 | // need to attach this one now. This happens for sections created |
| 974 | // directly by the linker. |
| 975 | if (this->sections_are_attached_) |
| 976 | this->attach_section_to_segment(os); |
| 977 | |
| 978 | return os; |
| 979 | } |
| 980 | |
| 981 | // Attach output sections to segments. This is called after we have |
| 982 | // seen all the input sections. |
| 983 | |
| 984 | void |
| 985 | Layout::attach_sections_to_segments() |
| 986 | { |
| 987 | for (Section_list::iterator p = this->section_list_.begin(); |
| 988 | p != this->section_list_.end(); |
| 989 | ++p) |
| 990 | this->attach_section_to_segment(*p); |
| 991 | |
| 992 | this->sections_are_attached_ = true; |
| 993 | } |
| 994 | |
| 995 | // Attach an output section to a segment. |
| 996 | |
| 997 | void |
| 998 | Layout::attach_section_to_segment(Output_section* os) |
| 999 | { |
| 1000 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0) |
| 1001 | this->unattached_section_list_.push_back(os); |
| 1002 | else |
| 1003 | this->attach_allocated_section_to_segment(os); |
| 1004 | } |
| 1005 | |
| 1006 | // Attach an allocated output section to a segment. |
| 1007 | |
| 1008 | void |
| 1009 | Layout::attach_allocated_section_to_segment(Output_section* os) |
| 1010 | { |
| 1011 | elfcpp::Elf_Xword flags = os->flags(); |
| 1012 | gold_assert((flags & elfcpp::SHF_ALLOC) != 0); |
| 1013 | |
| 1014 | if (parameters->options().relocatable()) |
| 1015 | return; |
| 1016 | |
| 1017 | // If we have a SECTIONS clause, we can't handle the attachment to |
| 1018 | // segments until after we've seen all the sections. |
| 1019 | if (this->script_options_->saw_sections_clause()) |
| 1020 | return; |
| 1021 | |
| 1022 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
| 1023 | |
| 1024 | // This output section goes into a PT_LOAD segment. |
| 1025 | |
| 1026 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); |
| 1027 | |
| 1028 | // Check for --section-start. |
| 1029 | uint64_t addr; |
| 1030 | bool is_address_set = parameters->options().section_start(os->name(), &addr); |
| 1031 | |
| 1032 | // In general the only thing we really care about for PT_LOAD |
| 1033 | // segments is whether or not they are writable, so that is how we |
| 1034 | // search for them. Large data sections also go into their own |
| 1035 | // PT_LOAD segment. People who need segments sorted on some other |
| 1036 | // basis will have to use a linker script. |
| 1037 | |
| 1038 | Segment_list::const_iterator p; |
| 1039 | for (p = this->segment_list_.begin(); |
| 1040 | p != this->segment_list_.end(); |
| 1041 | ++p) |
| 1042 | { |
| 1043 | if ((*p)->type() != elfcpp::PT_LOAD) |
| 1044 | continue; |
| 1045 | if (!parameters->options().omagic() |
| 1046 | && ((*p)->flags() & elfcpp::PF_W) != (seg_flags & elfcpp::PF_W)) |
| 1047 | continue; |
| 1048 | // If -Tbss was specified, we need to separate the data and BSS |
| 1049 | // segments. |
| 1050 | if (parameters->options().user_set_Tbss()) |
| 1051 | { |
| 1052 | if ((os->type() == elfcpp::SHT_NOBITS) |
| 1053 | == (*p)->has_any_data_sections()) |
| 1054 | continue; |
| 1055 | } |
| 1056 | if (os->is_large_data_section() && !(*p)->is_large_data_segment()) |
| 1057 | continue; |
| 1058 | |
| 1059 | if (is_address_set) |
| 1060 | { |
| 1061 | if ((*p)->are_addresses_set()) |
| 1062 | continue; |
| 1063 | |
| 1064 | (*p)->add_initial_output_data(os); |
| 1065 | (*p)->update_flags_for_output_section(seg_flags); |
| 1066 | (*p)->set_addresses(addr, addr); |
| 1067 | break; |
| 1068 | } |
| 1069 | |
| 1070 | (*p)->add_output_section(os, seg_flags, true); |
| 1071 | break; |
| 1072 | } |
| 1073 | |
| 1074 | if (p == this->segment_list_.end()) |
| 1075 | { |
| 1076 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD, |
| 1077 | seg_flags); |
| 1078 | if (os->is_large_data_section()) |
| 1079 | oseg->set_is_large_data_segment(); |
| 1080 | oseg->add_output_section(os, seg_flags, true); |
| 1081 | if (is_address_set) |
| 1082 | oseg->set_addresses(addr, addr); |
| 1083 | } |
| 1084 | |
| 1085 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE |
| 1086 | // segment. |
| 1087 | if (os->type() == elfcpp::SHT_NOTE) |
| 1088 | { |
| 1089 | // See if we already have an equivalent PT_NOTE segment. |
| 1090 | for (p = this->segment_list_.begin(); |
| 1091 | p != segment_list_.end(); |
| 1092 | ++p) |
| 1093 | { |
| 1094 | if ((*p)->type() == elfcpp::PT_NOTE |
| 1095 | && (((*p)->flags() & elfcpp::PF_W) |
| 1096 | == (seg_flags & elfcpp::PF_W))) |
| 1097 | { |
| 1098 | (*p)->add_output_section(os, seg_flags, false); |
| 1099 | break; |
| 1100 | } |
| 1101 | } |
| 1102 | |
| 1103 | if (p == this->segment_list_.end()) |
| 1104 | { |
| 1105 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE, |
| 1106 | seg_flags); |
| 1107 | oseg->add_output_section(os, seg_flags, false); |
| 1108 | } |
| 1109 | } |
| 1110 | |
| 1111 | // If we see a loadable SHF_TLS section, we create a PT_TLS |
| 1112 | // segment. There can only be one such segment. |
| 1113 | if ((flags & elfcpp::SHF_TLS) != 0) |
| 1114 | { |
| 1115 | if (this->tls_segment_ == NULL) |
| 1116 | this->make_output_segment(elfcpp::PT_TLS, seg_flags); |
| 1117 | this->tls_segment_->add_output_section(os, seg_flags, false); |
| 1118 | } |
| 1119 | |
| 1120 | // If -z relro is in effect, and we see a relro section, we create a |
| 1121 | // PT_GNU_RELRO segment. There can only be one such segment. |
| 1122 | if (os->is_relro() && parameters->options().relro()) |
| 1123 | { |
| 1124 | gold_assert(seg_flags == (elfcpp::PF_R | elfcpp::PF_W)); |
| 1125 | if (this->relro_segment_ == NULL) |
| 1126 | this->make_output_segment(elfcpp::PT_GNU_RELRO, seg_flags); |
| 1127 | this->relro_segment_->add_output_section(os, seg_flags, false); |
| 1128 | } |
| 1129 | } |
| 1130 | |
| 1131 | // Make an output section for a script. |
| 1132 | |
| 1133 | Output_section* |
| 1134 | Layout::make_output_section_for_script(const char* name) |
| 1135 | { |
| 1136 | name = this->namepool_.add(name, false, NULL); |
| 1137 | Output_section* os = this->make_output_section(name, elfcpp::SHT_PROGBITS, |
| 1138 | elfcpp::SHF_ALLOC, false, |
| 1139 | false, false, false, false); |
| 1140 | os->set_found_in_sections_clause(); |
| 1141 | return os; |
| 1142 | } |
| 1143 | |
| 1144 | // Return the number of segments we expect to see. |
| 1145 | |
| 1146 | size_t |
| 1147 | Layout::expected_segment_count() const |
| 1148 | { |
| 1149 | size_t ret = this->segment_list_.size(); |
| 1150 | |
| 1151 | // If we didn't see a SECTIONS clause in a linker script, we should |
| 1152 | // already have the complete list of segments. Otherwise we ask the |
| 1153 | // SECTIONS clause how many segments it expects, and add in the ones |
| 1154 | // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.) |
| 1155 | |
| 1156 | if (!this->script_options_->saw_sections_clause()) |
| 1157 | return ret; |
| 1158 | else |
| 1159 | { |
| 1160 | const Script_sections* ss = this->script_options_->script_sections(); |
| 1161 | return ret + ss->expected_segment_count(this); |
| 1162 | } |
| 1163 | } |
| 1164 | |
| 1165 | // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK |
| 1166 | // is whether we saw a .note.GNU-stack section in the object file. |
| 1167 | // GNU_STACK_FLAGS is the section flags. The flags give the |
| 1168 | // protection required for stack memory. We record this in an |
| 1169 | // executable as a PT_GNU_STACK segment. If an object file does not |
| 1170 | // have a .note.GNU-stack segment, we must assume that it is an old |
| 1171 | // object. On some targets that will force an executable stack. |
| 1172 | |
| 1173 | void |
| 1174 | Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags) |
| 1175 | { |
| 1176 | if (!seen_gnu_stack) |
| 1177 | this->input_without_gnu_stack_note_ = true; |
| 1178 | else |
| 1179 | { |
| 1180 | this->input_with_gnu_stack_note_ = true; |
| 1181 | if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0) |
| 1182 | this->input_requires_executable_stack_ = true; |
| 1183 | } |
| 1184 | } |
| 1185 | |
| 1186 | // Create automatic note sections. |
| 1187 | |
| 1188 | void |
| 1189 | Layout::create_notes() |
| 1190 | { |
| 1191 | this->create_gold_note(); |
| 1192 | this->create_executable_stack_info(); |
| 1193 | this->create_build_id(); |
| 1194 | } |
| 1195 | |
| 1196 | // Create the dynamic sections which are needed before we read the |
| 1197 | // relocs. |
| 1198 | |
| 1199 | void |
| 1200 | Layout::create_initial_dynamic_sections(Symbol_table* symtab) |
| 1201 | { |
| 1202 | if (parameters->doing_static_link()) |
| 1203 | return; |
| 1204 | |
| 1205 | this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic", |
| 1206 | elfcpp::SHT_DYNAMIC, |
| 1207 | (elfcpp::SHF_ALLOC |
| 1208 | | elfcpp::SHF_WRITE), |
| 1209 | false, false, true, |
| 1210 | true, false, false); |
| 1211 | |
| 1212 | this->dynamic_symbol_ = |
| 1213 | symtab->define_in_output_data("_DYNAMIC", NULL, Symbol_table::PREDEFINED, |
| 1214 | this->dynamic_section_, 0, 0, |
| 1215 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, |
| 1216 | elfcpp::STV_HIDDEN, 0, false, false); |
| 1217 | |
| 1218 | this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_); |
| 1219 | |
| 1220 | this->dynamic_section_->add_output_section_data(this->dynamic_data_); |
| 1221 | } |
| 1222 | |
| 1223 | // For each output section whose name can be represented as C symbol, |
| 1224 | // define __start and __stop symbols for the section. This is a GNU |
| 1225 | // extension. |
| 1226 | |
| 1227 | void |
| 1228 | Layout::define_section_symbols(Symbol_table* symtab) |
| 1229 | { |
| 1230 | for (Section_list::const_iterator p = this->section_list_.begin(); |
| 1231 | p != this->section_list_.end(); |
| 1232 | ++p) |
| 1233 | { |
| 1234 | const char* const name = (*p)->name(); |
| 1235 | if (is_cident(name)) |
| 1236 | { |
| 1237 | const std::string name_string(name); |
| 1238 | const std::string start_name(cident_section_start_prefix |
| 1239 | + name_string); |
| 1240 | const std::string stop_name(cident_section_stop_prefix |
| 1241 | + name_string); |
| 1242 | |
| 1243 | symtab->define_in_output_data(start_name.c_str(), |
| 1244 | NULL, // version |
| 1245 | Symbol_table::PREDEFINED, |
| 1246 | *p, |
| 1247 | 0, // value |
| 1248 | 0, // symsize |
| 1249 | elfcpp::STT_NOTYPE, |
| 1250 | elfcpp::STB_GLOBAL, |
| 1251 | elfcpp::STV_DEFAULT, |
| 1252 | 0, // nonvis |
| 1253 | false, // offset_is_from_end |
| 1254 | true); // only_if_ref |
| 1255 | |
| 1256 | symtab->define_in_output_data(stop_name.c_str(), |
| 1257 | NULL, // version |
| 1258 | Symbol_table::PREDEFINED, |
| 1259 | *p, |
| 1260 | 0, // value |
| 1261 | 0, // symsize |
| 1262 | elfcpp::STT_NOTYPE, |
| 1263 | elfcpp::STB_GLOBAL, |
| 1264 | elfcpp::STV_DEFAULT, |
| 1265 | 0, // nonvis |
| 1266 | true, // offset_is_from_end |
| 1267 | true); // only_if_ref |
| 1268 | } |
| 1269 | } |
| 1270 | } |
| 1271 | |
| 1272 | // Define symbols for group signatures. |
| 1273 | |
| 1274 | void |
| 1275 | Layout::define_group_signatures(Symbol_table* symtab) |
| 1276 | { |
| 1277 | for (Group_signatures::iterator p = this->group_signatures_.begin(); |
| 1278 | p != this->group_signatures_.end(); |
| 1279 | ++p) |
| 1280 | { |
| 1281 | Symbol* sym = symtab->lookup(p->signature, NULL); |
| 1282 | if (sym != NULL) |
| 1283 | p->section->set_info_symndx(sym); |
| 1284 | else |
| 1285 | { |
| 1286 | // Force the name of the group section to the group |
| 1287 | // signature, and use the group's section symbol as the |
| 1288 | // signature symbol. |
| 1289 | if (strcmp(p->section->name(), p->signature) != 0) |
| 1290 | { |
| 1291 | const char* name = this->namepool_.add(p->signature, |
| 1292 | true, NULL); |
| 1293 | p->section->set_name(name); |
| 1294 | } |
| 1295 | p->section->set_needs_symtab_index(); |
| 1296 | p->section->set_info_section_symndx(p->section); |
| 1297 | } |
| 1298 | } |
| 1299 | |
| 1300 | this->group_signatures_.clear(); |
| 1301 | } |
| 1302 | |
| 1303 | // Find the first read-only PT_LOAD segment, creating one if |
| 1304 | // necessary. |
| 1305 | |
| 1306 | Output_segment* |
| 1307 | Layout::find_first_load_seg() |
| 1308 | { |
| 1309 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
| 1310 | p != this->segment_list_.end(); |
| 1311 | ++p) |
| 1312 | { |
| 1313 | if ((*p)->type() == elfcpp::PT_LOAD |
| 1314 | && ((*p)->flags() & elfcpp::PF_R) != 0 |
| 1315 | && (parameters->options().omagic() |
| 1316 | || ((*p)->flags() & elfcpp::PF_W) == 0)) |
| 1317 | return *p; |
| 1318 | } |
| 1319 | |
| 1320 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
| 1321 | |
| 1322 | Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD, |
| 1323 | elfcpp::PF_R); |
| 1324 | return load_seg; |
| 1325 | } |
| 1326 | |
| 1327 | // Save states of all current output segments. Store saved states |
| 1328 | // in SEGMENT_STATES. |
| 1329 | |
| 1330 | void |
| 1331 | Layout::save_segments(Segment_states* segment_states) |
| 1332 | { |
| 1333 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
| 1334 | p != this->segment_list_.end(); |
| 1335 | ++p) |
| 1336 | { |
| 1337 | Output_segment* segment = *p; |
| 1338 | // Shallow copy. |
| 1339 | Output_segment* copy = new Output_segment(*segment); |
| 1340 | (*segment_states)[segment] = copy; |
| 1341 | } |
| 1342 | } |
| 1343 | |
| 1344 | // Restore states of output segments and delete any segment not found in |
| 1345 | // SEGMENT_STATES. |
| 1346 | |
| 1347 | void |
| 1348 | Layout::restore_segments(const Segment_states* segment_states) |
| 1349 | { |
| 1350 | // Go through the segment list and remove any segment added in the |
| 1351 | // relaxation loop. |
| 1352 | this->tls_segment_ = NULL; |
| 1353 | this->relro_segment_ = NULL; |
| 1354 | Segment_list::iterator list_iter = this->segment_list_.begin(); |
| 1355 | while (list_iter != this->segment_list_.end()) |
| 1356 | { |
| 1357 | Output_segment* segment = *list_iter; |
| 1358 | Segment_states::const_iterator states_iter = |
| 1359 | segment_states->find(segment); |
| 1360 | if (states_iter != segment_states->end()) |
| 1361 | { |
| 1362 | const Output_segment* copy = states_iter->second; |
| 1363 | // Shallow copy to restore states. |
| 1364 | *segment = *copy; |
| 1365 | |
| 1366 | // Also fix up TLS and RELRO segment pointers as appropriate. |
| 1367 | if (segment->type() == elfcpp::PT_TLS) |
| 1368 | this->tls_segment_ = segment; |
| 1369 | else if (segment->type() == elfcpp::PT_GNU_RELRO) |
| 1370 | this->relro_segment_ = segment; |
| 1371 | |
| 1372 | ++list_iter; |
| 1373 | } |
| 1374 | else |
| 1375 | { |
| 1376 | list_iter = this->segment_list_.erase(list_iter); |
| 1377 | // This is a segment created during section layout. It should be |
| 1378 | // safe to remove it since we should have removed all pointers to it. |
| 1379 | delete segment; |
| 1380 | } |
| 1381 | } |
| 1382 | } |
| 1383 | |
| 1384 | // Clean up after relaxation so that sections can be laid out again. |
| 1385 | |
| 1386 | void |
| 1387 | Layout::clean_up_after_relaxation() |
| 1388 | { |
| 1389 | // Restore the segments to point state just prior to the relaxation loop. |
| 1390 | Script_sections* script_section = this->script_options_->script_sections(); |
| 1391 | script_section->release_segments(); |
| 1392 | this->restore_segments(this->segment_states_); |
| 1393 | |
| 1394 | // Reset section addresses and file offsets |
| 1395 | for (Section_list::iterator p = this->section_list_.begin(); |
| 1396 | p != this->section_list_.end(); |
| 1397 | ++p) |
| 1398 | { |
| 1399 | (*p)->reset_address_and_file_offset(); |
| 1400 | (*p)->restore_states(); |
| 1401 | } |
| 1402 | |
| 1403 | // Reset special output object address and file offsets. |
| 1404 | for (Data_list::iterator p = this->special_output_list_.begin(); |
| 1405 | p != this->special_output_list_.end(); |
| 1406 | ++p) |
| 1407 | (*p)->reset_address_and_file_offset(); |
| 1408 | |
| 1409 | // A linker script may have created some output section data objects. |
| 1410 | // They are useless now. |
| 1411 | for (Output_section_data_list::const_iterator p = |
| 1412 | this->script_output_section_data_list_.begin(); |
| 1413 | p != this->script_output_section_data_list_.end(); |
| 1414 | ++p) |
| 1415 | delete *p; |
| 1416 | this->script_output_section_data_list_.clear(); |
| 1417 | } |
| 1418 | |
| 1419 | // Prepare for relaxation. |
| 1420 | |
| 1421 | void |
| 1422 | Layout::prepare_for_relaxation() |
| 1423 | { |
| 1424 | // Create an relaxation debug check if in debugging mode. |
| 1425 | if (is_debugging_enabled(DEBUG_RELAXATION)) |
| 1426 | this->relaxation_debug_check_ = new Relaxation_debug_check(); |
| 1427 | |
| 1428 | // Save segment states. |
| 1429 | this->segment_states_ = new Segment_states(); |
| 1430 | this->save_segments(this->segment_states_); |
| 1431 | |
| 1432 | for(Section_list::const_iterator p = this->section_list_.begin(); |
| 1433 | p != this->section_list_.end(); |
| 1434 | ++p) |
| 1435 | (*p)->save_states(); |
| 1436 | |
| 1437 | if (is_debugging_enabled(DEBUG_RELAXATION)) |
| 1438 | this->relaxation_debug_check_->check_output_data_for_reset_values( |
| 1439 | this->section_list_, this->special_output_list_); |
| 1440 | |
| 1441 | // Also enable recording of output section data from scripts. |
| 1442 | this->record_output_section_data_from_script_ = true; |
| 1443 | } |
| 1444 | |
| 1445 | // Relaxation loop body: If target has no relaxation, this runs only once |
| 1446 | // Otherwise, the target relaxation hook is called at the end of |
| 1447 | // each iteration. If the hook returns true, it means re-layout of |
| 1448 | // section is required. |
| 1449 | // |
| 1450 | // The number of segments created by a linking script without a PHDRS |
| 1451 | // clause may be affected by section sizes and alignments. There is |
| 1452 | // a remote chance that relaxation causes different number of PT_LOAD |
| 1453 | // segments are created and sections are attached to different segments. |
| 1454 | // Therefore, we always throw away all segments created during section |
| 1455 | // layout. In order to be able to restart the section layout, we keep |
| 1456 | // a copy of the segment list right before the relaxation loop and use |
| 1457 | // that to restore the segments. |
| 1458 | // |
| 1459 | // PASS is the current relaxation pass number. |
| 1460 | // SYMTAB is a symbol table. |
| 1461 | // PLOAD_SEG is the address of a pointer for the load segment. |
| 1462 | // PHDR_SEG is a pointer to the PHDR segment. |
| 1463 | // SEGMENT_HEADERS points to the output segment header. |
| 1464 | // FILE_HEADER points to the output file header. |
| 1465 | // PSHNDX is the address to store the output section index. |
| 1466 | |
| 1467 | off_t inline |
| 1468 | Layout::relaxation_loop_body( |
| 1469 | int pass, |
| 1470 | Target* target, |
| 1471 | Symbol_table* symtab, |
| 1472 | Output_segment** pload_seg, |
| 1473 | Output_segment* phdr_seg, |
| 1474 | Output_segment_headers* segment_headers, |
| 1475 | Output_file_header* file_header, |
| 1476 | unsigned int* pshndx) |
| 1477 | { |
| 1478 | // If this is not the first iteration, we need to clean up after |
| 1479 | // relaxation so that we can lay out the sections again. |
| 1480 | if (pass != 0) |
| 1481 | this->clean_up_after_relaxation(); |
| 1482 | |
| 1483 | // If there is a SECTIONS clause, put all the input sections into |
| 1484 | // the required order. |
| 1485 | Output_segment* load_seg; |
| 1486 | if (this->script_options_->saw_sections_clause()) |
| 1487 | load_seg = this->set_section_addresses_from_script(symtab); |
| 1488 | else if (parameters->options().relocatable()) |
| 1489 | load_seg = NULL; |
| 1490 | else |
| 1491 | load_seg = this->find_first_load_seg(); |
| 1492 | |
| 1493 | if (parameters->options().oformat_enum() |
| 1494 | != General_options::OBJECT_FORMAT_ELF) |
| 1495 | load_seg = NULL; |
| 1496 | |
| 1497 | // If the user set the address of the text segment, that may not be |
| 1498 | // compatible with putting the segment headers and file headers into |
| 1499 | // that segment. |
| 1500 | if (parameters->options().user_set_Ttext()) |
| 1501 | load_seg = NULL; |
| 1502 | |
| 1503 | gold_assert(phdr_seg == NULL |
| 1504 | || load_seg != NULL |
| 1505 | || this->script_options_->saw_sections_clause()); |
| 1506 | |
| 1507 | // If the address of the load segment we found has been set by |
| 1508 | // --section-start rather than by a script, then we don't want to |
| 1509 | // use it for the file and segment headers. |
| 1510 | if (load_seg != NULL |
| 1511 | && load_seg->are_addresses_set() |
| 1512 | && !this->script_options_->saw_sections_clause()) |
| 1513 | load_seg = NULL; |
| 1514 | |
| 1515 | // Lay out the segment headers. |
| 1516 | if (!parameters->options().relocatable()) |
| 1517 | { |
| 1518 | gold_assert(segment_headers != NULL); |
| 1519 | if (load_seg != NULL) |
| 1520 | load_seg->add_initial_output_data(segment_headers); |
| 1521 | if (phdr_seg != NULL) |
| 1522 | phdr_seg->add_initial_output_data(segment_headers); |
| 1523 | } |
| 1524 | |
| 1525 | // Lay out the file header. |
| 1526 | if (load_seg != NULL) |
| 1527 | load_seg->add_initial_output_data(file_header); |
| 1528 | |
| 1529 | if (this->script_options_->saw_phdrs_clause() |
| 1530 | && !parameters->options().relocatable()) |
| 1531 | { |
| 1532 | // Support use of FILEHDRS and PHDRS attachments in a PHDRS |
| 1533 | // clause in a linker script. |
| 1534 | Script_sections* ss = this->script_options_->script_sections(); |
| 1535 | ss->put_headers_in_phdrs(file_header, segment_headers); |
| 1536 | } |
| 1537 | |
| 1538 | // We set the output section indexes in set_segment_offsets and |
| 1539 | // set_section_indexes. |
| 1540 | *pshndx = 1; |
| 1541 | |
| 1542 | // Set the file offsets of all the segments, and all the sections |
| 1543 | // they contain. |
| 1544 | off_t off; |
| 1545 | if (!parameters->options().relocatable()) |
| 1546 | off = this->set_segment_offsets(target, load_seg, pshndx); |
| 1547 | else |
| 1548 | off = this->set_relocatable_section_offsets(file_header, pshndx); |
| 1549 | |
| 1550 | // Verify that the dummy relaxation does not change anything. |
| 1551 | if (is_debugging_enabled(DEBUG_RELAXATION)) |
| 1552 | { |
| 1553 | if (pass == 0) |
| 1554 | this->relaxation_debug_check_->read_sections(this->section_list_); |
| 1555 | else |
| 1556 | this->relaxation_debug_check_->verify_sections(this->section_list_); |
| 1557 | } |
| 1558 | |
| 1559 | *pload_seg = load_seg; |
| 1560 | return off; |
| 1561 | } |
| 1562 | |
| 1563 | // Finalize the layout. When this is called, we have created all the |
| 1564 | // output sections and all the output segments which are based on |
| 1565 | // input sections. We have several things to do, and we have to do |
| 1566 | // them in the right order, so that we get the right results correctly |
| 1567 | // and efficiently. |
| 1568 | |
| 1569 | // 1) Finalize the list of output segments and create the segment |
| 1570 | // table header. |
| 1571 | |
| 1572 | // 2) Finalize the dynamic symbol table and associated sections. |
| 1573 | |
| 1574 | // 3) Determine the final file offset of all the output segments. |
| 1575 | |
| 1576 | // 4) Determine the final file offset of all the SHF_ALLOC output |
| 1577 | // sections. |
| 1578 | |
| 1579 | // 5) Create the symbol table sections and the section name table |
| 1580 | // section. |
| 1581 | |
| 1582 | // 6) Finalize the symbol table: set symbol values to their final |
| 1583 | // value and make a final determination of which symbols are going |
| 1584 | // into the output symbol table. |
| 1585 | |
| 1586 | // 7) Create the section table header. |
| 1587 | |
| 1588 | // 8) Determine the final file offset of all the output sections which |
| 1589 | // are not SHF_ALLOC, including the section table header. |
| 1590 | |
| 1591 | // 9) Finalize the ELF file header. |
| 1592 | |
| 1593 | // This function returns the size of the output file. |
| 1594 | |
| 1595 | off_t |
| 1596 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab, |
| 1597 | Target* target, const Task* task) |
| 1598 | { |
| 1599 | target->finalize_sections(this, input_objects, symtab); |
| 1600 | |
| 1601 | this->count_local_symbols(task, input_objects); |
| 1602 | |
| 1603 | this->link_stabs_sections(); |
| 1604 | |
| 1605 | Output_segment* phdr_seg = NULL; |
| 1606 | if (!parameters->options().relocatable() && !parameters->doing_static_link()) |
| 1607 | { |
| 1608 | // There was a dynamic object in the link. We need to create |
| 1609 | // some information for the dynamic linker. |
| 1610 | |
| 1611 | // Create the PT_PHDR segment which will hold the program |
| 1612 | // headers. |
| 1613 | if (!this->script_options_->saw_phdrs_clause()) |
| 1614 | phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); |
| 1615 | |
| 1616 | // Create the dynamic symbol table, including the hash table. |
| 1617 | Output_section* dynstr; |
| 1618 | std::vector<Symbol*> dynamic_symbols; |
| 1619 | unsigned int local_dynamic_count; |
| 1620 | Versions versions(*this->script_options()->version_script_info(), |
| 1621 | &this->dynpool_); |
| 1622 | this->create_dynamic_symtab(input_objects, symtab, &dynstr, |
| 1623 | &local_dynamic_count, &dynamic_symbols, |
| 1624 | &versions); |
| 1625 | |
| 1626 | // Create the .interp section to hold the name of the |
| 1627 | // interpreter, and put it in a PT_INTERP segment. |
| 1628 | if (!parameters->options().shared()) |
| 1629 | this->create_interp(target); |
| 1630 | |
| 1631 | // Finish the .dynamic section to hold the dynamic data, and put |
| 1632 | // it in a PT_DYNAMIC segment. |
| 1633 | this->finish_dynamic_section(input_objects, symtab); |
| 1634 | |
| 1635 | // We should have added everything we need to the dynamic string |
| 1636 | // table. |
| 1637 | this->dynpool_.set_string_offsets(); |
| 1638 | |
| 1639 | // Create the version sections. We can't do this until the |
| 1640 | // dynamic string table is complete. |
| 1641 | this->create_version_sections(&versions, symtab, local_dynamic_count, |
| 1642 | dynamic_symbols, dynstr); |
| 1643 | |
| 1644 | // Set the size of the _DYNAMIC symbol. We can't do this until |
| 1645 | // after we call create_version_sections. |
| 1646 | this->set_dynamic_symbol_size(symtab); |
| 1647 | } |
| 1648 | |
| 1649 | if (this->incremental_inputs_) |
| 1650 | { |
| 1651 | this->incremental_inputs_->finalize(); |
| 1652 | this->create_incremental_info_sections(); |
| 1653 | } |
| 1654 | |
| 1655 | // Create segment headers. |
| 1656 | Output_segment_headers* segment_headers = |
| 1657 | (parameters->options().relocatable() |
| 1658 | ? NULL |
| 1659 | : new Output_segment_headers(this->segment_list_)); |
| 1660 | |
| 1661 | // Lay out the file header. |
| 1662 | Output_file_header* file_header |
| 1663 | = new Output_file_header(target, symtab, segment_headers, |
| 1664 | parameters->options().entry()); |
| 1665 | |
| 1666 | this->special_output_list_.push_back(file_header); |
| 1667 | if (segment_headers != NULL) |
| 1668 | this->special_output_list_.push_back(segment_headers); |
| 1669 | |
| 1670 | // Find approriate places for orphan output sections if we are using |
| 1671 | // a linker script. |
| 1672 | if (this->script_options_->saw_sections_clause()) |
| 1673 | this->place_orphan_sections_in_script(); |
| 1674 | |
| 1675 | Output_segment* load_seg; |
| 1676 | off_t off; |
| 1677 | unsigned int shndx; |
| 1678 | int pass = 0; |
| 1679 | |
| 1680 | // Take a snapshot of the section layout as needed. |
| 1681 | if (target->may_relax()) |
| 1682 | this->prepare_for_relaxation(); |
| 1683 | |
| 1684 | // Run the relaxation loop to lay out sections. |
| 1685 | do |
| 1686 | { |
| 1687 | off = this->relaxation_loop_body(pass, target, symtab, &load_seg, |
| 1688 | phdr_seg, segment_headers, file_header, |
| 1689 | &shndx); |
| 1690 | pass++; |
| 1691 | } |
| 1692 | while (target->may_relax() |
| 1693 | && target->relax(pass, input_objects, symtab, this)); |
| 1694 | |
| 1695 | // Set the file offsets of all the non-data sections we've seen so |
| 1696 | // far which don't have to wait for the input sections. We need |
| 1697 | // this in order to finalize local symbols in non-allocated |
| 1698 | // sections. |
| 1699 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
| 1700 | |
| 1701 | // Set the section indexes of all unallocated sections seen so far, |
| 1702 | // in case any of them are somehow referenced by a symbol. |
| 1703 | shndx = this->set_section_indexes(shndx); |
| 1704 | |
| 1705 | // Create the symbol table sections. |
| 1706 | this->create_symtab_sections(input_objects, symtab, shndx, &off); |
| 1707 | if (!parameters->doing_static_link()) |
| 1708 | this->assign_local_dynsym_offsets(input_objects); |
| 1709 | |
| 1710 | // Process any symbol assignments from a linker script. This must |
| 1711 | // be called after the symbol table has been finalized. |
| 1712 | this->script_options_->finalize_symbols(symtab, this); |
| 1713 | |
| 1714 | // Create the .shstrtab section. |
| 1715 | Output_section* shstrtab_section = this->create_shstrtab(); |
| 1716 | |
| 1717 | // Set the file offsets of the rest of the non-data sections which |
| 1718 | // don't have to wait for the input sections. |
| 1719 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
| 1720 | |
| 1721 | // Now that all sections have been created, set the section indexes |
| 1722 | // for any sections which haven't been done yet. |
| 1723 | shndx = this->set_section_indexes(shndx); |
| 1724 | |
| 1725 | // Create the section table header. |
| 1726 | this->create_shdrs(shstrtab_section, &off); |
| 1727 | |
| 1728 | // If there are no sections which require postprocessing, we can |
| 1729 | // handle the section names now, and avoid a resize later. |
| 1730 | if (!this->any_postprocessing_sections_) |
| 1731 | off = this->set_section_offsets(off, |
| 1732 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); |
| 1733 | |
| 1734 | file_header->set_section_info(this->section_headers_, shstrtab_section); |
| 1735 | |
| 1736 | // Now we know exactly where everything goes in the output file |
| 1737 | // (except for non-allocated sections which require postprocessing). |
| 1738 | Output_data::layout_complete(); |
| 1739 | |
| 1740 | this->output_file_size_ = off; |
| 1741 | |
| 1742 | return off; |
| 1743 | } |
| 1744 | |
| 1745 | // Create a note header following the format defined in the ELF ABI. |
| 1746 | // NAME is the name, NOTE_TYPE is the type, SECTION_NAME is the name |
| 1747 | // of the section to create, DESCSZ is the size of the descriptor. |
| 1748 | // ALLOCATE is true if the section should be allocated in memory. |
| 1749 | // This returns the new note section. It sets *TRAILING_PADDING to |
| 1750 | // the number of trailing zero bytes required. |
| 1751 | |
| 1752 | Output_section* |
| 1753 | Layout::create_note(const char* name, int note_type, |
| 1754 | const char* section_name, size_t descsz, |
| 1755 | bool allocate, size_t* trailing_padding) |
| 1756 | { |
| 1757 | // Authorities all agree that the values in a .note field should |
| 1758 | // be aligned on 4-byte boundaries for 32-bit binaries. However, |
| 1759 | // they differ on what the alignment is for 64-bit binaries. |
| 1760 | // The GABI says unambiguously they take 8-byte alignment: |
| 1761 | // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section |
| 1762 | // Other documentation says alignment should always be 4 bytes: |
| 1763 | // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format |
| 1764 | // GNU ld and GNU readelf both support the latter (at least as of |
| 1765 | // version 2.16.91), and glibc always generates the latter for |
| 1766 | // .note.ABI-tag (as of version 1.6), so that's the one we go with |
| 1767 | // here. |
| 1768 | #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default. |
| 1769 | const int size = parameters->target().get_size(); |
| 1770 | #else |
| 1771 | const int size = 32; |
| 1772 | #endif |
| 1773 | |
| 1774 | // The contents of the .note section. |
| 1775 | size_t namesz = strlen(name) + 1; |
| 1776 | size_t aligned_namesz = align_address(namesz, size / 8); |
| 1777 | size_t aligned_descsz = align_address(descsz, size / 8); |
| 1778 | |
| 1779 | size_t notehdrsz = 3 * (size / 8) + aligned_namesz; |
| 1780 | |
| 1781 | unsigned char* buffer = new unsigned char[notehdrsz]; |
| 1782 | memset(buffer, 0, notehdrsz); |
| 1783 | |
| 1784 | bool is_big_endian = parameters->target().is_big_endian(); |
| 1785 | |
| 1786 | if (size == 32) |
| 1787 | { |
| 1788 | if (!is_big_endian) |
| 1789 | { |
| 1790 | elfcpp::Swap<32, false>::writeval(buffer, namesz); |
| 1791 | elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); |
| 1792 | elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); |
| 1793 | } |
| 1794 | else |
| 1795 | { |
| 1796 | elfcpp::Swap<32, true>::writeval(buffer, namesz); |
| 1797 | elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); |
| 1798 | elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); |
| 1799 | } |
| 1800 | } |
| 1801 | else if (size == 64) |
| 1802 | { |
| 1803 | if (!is_big_endian) |
| 1804 | { |
| 1805 | elfcpp::Swap<64, false>::writeval(buffer, namesz); |
| 1806 | elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); |
| 1807 | elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); |
| 1808 | } |
| 1809 | else |
| 1810 | { |
| 1811 | elfcpp::Swap<64, true>::writeval(buffer, namesz); |
| 1812 | elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); |
| 1813 | elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); |
| 1814 | } |
| 1815 | } |
| 1816 | else |
| 1817 | gold_unreachable(); |
| 1818 | |
| 1819 | memcpy(buffer + 3 * (size / 8), name, namesz); |
| 1820 | |
| 1821 | elfcpp::Elf_Xword flags = 0; |
| 1822 | if (allocate) |
| 1823 | flags = elfcpp::SHF_ALLOC; |
| 1824 | Output_section* os = this->choose_output_section(NULL, section_name, |
| 1825 | elfcpp::SHT_NOTE, |
| 1826 | flags, false, false, |
| 1827 | false, false, false, false); |
| 1828 | if (os == NULL) |
| 1829 | return NULL; |
| 1830 | |
| 1831 | Output_section_data* posd = new Output_data_const_buffer(buffer, notehdrsz, |
| 1832 | size / 8, |
| 1833 | "** note header"); |
| 1834 | os->add_output_section_data(posd); |
| 1835 | |
| 1836 | *trailing_padding = aligned_descsz - descsz; |
| 1837 | |
| 1838 | return os; |
| 1839 | } |
| 1840 | |
| 1841 | // For an executable or shared library, create a note to record the |
| 1842 | // version of gold used to create the binary. |
| 1843 | |
| 1844 | void |
| 1845 | Layout::create_gold_note() |
| 1846 | { |
| 1847 | if (parameters->options().relocatable()) |
| 1848 | return; |
| 1849 | |
| 1850 | std::string desc = std::string("gold ") + gold::get_version_string(); |
| 1851 | |
| 1852 | size_t trailing_padding; |
| 1853 | Output_section *os = this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION, |
| 1854 | ".note.gnu.gold-version", desc.size(), |
| 1855 | false, &trailing_padding); |
| 1856 | if (os == NULL) |
| 1857 | return; |
| 1858 | |
| 1859 | Output_section_data* posd = new Output_data_const(desc, 4); |
| 1860 | os->add_output_section_data(posd); |
| 1861 | |
| 1862 | if (trailing_padding > 0) |
| 1863 | { |
| 1864 | posd = new Output_data_zero_fill(trailing_padding, 0); |
| 1865 | os->add_output_section_data(posd); |
| 1866 | } |
| 1867 | } |
| 1868 | |
| 1869 | // Record whether the stack should be executable. This can be set |
| 1870 | // from the command line using the -z execstack or -z noexecstack |
| 1871 | // options. Otherwise, if any input file has a .note.GNU-stack |
| 1872 | // section with the SHF_EXECINSTR flag set, the stack should be |
| 1873 | // executable. Otherwise, if at least one input file a |
| 1874 | // .note.GNU-stack section, and some input file has no .note.GNU-stack |
| 1875 | // section, we use the target default for whether the stack should be |
| 1876 | // executable. Otherwise, we don't generate a stack note. When |
| 1877 | // generating a object file, we create a .note.GNU-stack section with |
| 1878 | // the appropriate marking. When generating an executable or shared |
| 1879 | // library, we create a PT_GNU_STACK segment. |
| 1880 | |
| 1881 | void |
| 1882 | Layout::create_executable_stack_info() |
| 1883 | { |
| 1884 | bool is_stack_executable; |
| 1885 | if (parameters->options().is_execstack_set()) |
| 1886 | is_stack_executable = parameters->options().is_stack_executable(); |
| 1887 | else if (!this->input_with_gnu_stack_note_) |
| 1888 | return; |
| 1889 | else |
| 1890 | { |
| 1891 | if (this->input_requires_executable_stack_) |
| 1892 | is_stack_executable = true; |
| 1893 | else if (this->input_without_gnu_stack_note_) |
| 1894 | is_stack_executable = |
| 1895 | parameters->target().is_default_stack_executable(); |
| 1896 | else |
| 1897 | is_stack_executable = false; |
| 1898 | } |
| 1899 | |
| 1900 | if (parameters->options().relocatable()) |
| 1901 | { |
| 1902 | const char* name = this->namepool_.add(".note.GNU-stack", false, NULL); |
| 1903 | elfcpp::Elf_Xword flags = 0; |
| 1904 | if (is_stack_executable) |
| 1905 | flags |= elfcpp::SHF_EXECINSTR; |
| 1906 | this->make_output_section(name, elfcpp::SHT_PROGBITS, flags, false, |
| 1907 | false, false, false, false); |
| 1908 | } |
| 1909 | else |
| 1910 | { |
| 1911 | if (this->script_options_->saw_phdrs_clause()) |
| 1912 | return; |
| 1913 | int flags = elfcpp::PF_R | elfcpp::PF_W; |
| 1914 | if (is_stack_executable) |
| 1915 | flags |= elfcpp::PF_X; |
| 1916 | this->make_output_segment(elfcpp::PT_GNU_STACK, flags); |
| 1917 | } |
| 1918 | } |
| 1919 | |
| 1920 | // If --build-id was used, set up the build ID note. |
| 1921 | |
| 1922 | void |
| 1923 | Layout::create_build_id() |
| 1924 | { |
| 1925 | if (!parameters->options().user_set_build_id()) |
| 1926 | return; |
| 1927 | |
| 1928 | const char* style = parameters->options().build_id(); |
| 1929 | if (strcmp(style, "none") == 0) |
| 1930 | return; |
| 1931 | |
| 1932 | // Set DESCSZ to the size of the note descriptor. When possible, |
| 1933 | // set DESC to the note descriptor contents. |
| 1934 | size_t descsz; |
| 1935 | std::string desc; |
| 1936 | if (strcmp(style, "md5") == 0) |
| 1937 | descsz = 128 / 8; |
| 1938 | else if (strcmp(style, "sha1") == 0) |
| 1939 | descsz = 160 / 8; |
| 1940 | else if (strcmp(style, "uuid") == 0) |
| 1941 | { |
| 1942 | const size_t uuidsz = 128 / 8; |
| 1943 | |
| 1944 | char buffer[uuidsz]; |
| 1945 | memset(buffer, 0, uuidsz); |
| 1946 | |
| 1947 | int descriptor = open_descriptor(-1, "/dev/urandom", O_RDONLY); |
| 1948 | if (descriptor < 0) |
| 1949 | gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"), |
| 1950 | strerror(errno)); |
| 1951 | else |
| 1952 | { |
| 1953 | ssize_t got = ::read(descriptor, buffer, uuidsz); |
| 1954 | release_descriptor(descriptor, true); |
| 1955 | if (got < 0) |
| 1956 | gold_error(_("/dev/urandom: read failed: %s"), strerror(errno)); |
| 1957 | else if (static_cast<size_t>(got) != uuidsz) |
| 1958 | gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"), |
| 1959 | uuidsz, got); |
| 1960 | } |
| 1961 | |
| 1962 | desc.assign(buffer, uuidsz); |
| 1963 | descsz = uuidsz; |
| 1964 | } |
| 1965 | else if (strncmp(style, "0x", 2) == 0) |
| 1966 | { |
| 1967 | hex_init(); |
| 1968 | const char* p = style + 2; |
| 1969 | while (*p != '\0') |
| 1970 | { |
| 1971 | if (hex_p(p[0]) && hex_p(p[1])) |
| 1972 | { |
| 1973 | char c = (hex_value(p[0]) << 4) | hex_value(p[1]); |
| 1974 | desc += c; |
| 1975 | p += 2; |
| 1976 | } |
| 1977 | else if (*p == '-' || *p == ':') |
| 1978 | ++p; |
| 1979 | else |
| 1980 | gold_fatal(_("--build-id argument '%s' not a valid hex number"), |
| 1981 | style); |
| 1982 | } |
| 1983 | descsz = desc.size(); |
| 1984 | } |
| 1985 | else |
| 1986 | gold_fatal(_("unrecognized --build-id argument '%s'"), style); |
| 1987 | |
| 1988 | // Create the note. |
| 1989 | size_t trailing_padding; |
| 1990 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID, |
| 1991 | ".note.gnu.build-id", descsz, true, |
| 1992 | &trailing_padding); |
| 1993 | if (os == NULL) |
| 1994 | return; |
| 1995 | |
| 1996 | if (!desc.empty()) |
| 1997 | { |
| 1998 | // We know the value already, so we fill it in now. |
| 1999 | gold_assert(desc.size() == descsz); |
| 2000 | |
| 2001 | Output_section_data* posd = new Output_data_const(desc, 4); |
| 2002 | os->add_output_section_data(posd); |
| 2003 | |
| 2004 | if (trailing_padding != 0) |
| 2005 | { |
| 2006 | posd = new Output_data_zero_fill(trailing_padding, 0); |
| 2007 | os->add_output_section_data(posd); |
| 2008 | } |
| 2009 | } |
| 2010 | else |
| 2011 | { |
| 2012 | // We need to compute a checksum after we have completed the |
| 2013 | // link. |
| 2014 | gold_assert(trailing_padding == 0); |
| 2015 | this->build_id_note_ = new Output_data_zero_fill(descsz, 4); |
| 2016 | os->add_output_section_data(this->build_id_note_); |
| 2017 | } |
| 2018 | } |
| 2019 | |
| 2020 | // If we have both .stabXX and .stabXXstr sections, then the sh_link |
| 2021 | // field of the former should point to the latter. I'm not sure who |
| 2022 | // started this, but the GNU linker does it, and some tools depend |
| 2023 | // upon it. |
| 2024 | |
| 2025 | void |
| 2026 | Layout::link_stabs_sections() |
| 2027 | { |
| 2028 | if (!this->have_stabstr_section_) |
| 2029 | return; |
| 2030 | |
| 2031 | for (Section_list::iterator p = this->section_list_.begin(); |
| 2032 | p != this->section_list_.end(); |
| 2033 | ++p) |
| 2034 | { |
| 2035 | if ((*p)->type() != elfcpp::SHT_STRTAB) |
| 2036 | continue; |
| 2037 | |
| 2038 | const char* name = (*p)->name(); |
| 2039 | if (strncmp(name, ".stab", 5) != 0) |
| 2040 | continue; |
| 2041 | |
| 2042 | size_t len = strlen(name); |
| 2043 | if (strcmp(name + len - 3, "str") != 0) |
| 2044 | continue; |
| 2045 | |
| 2046 | std::string stab_name(name, len - 3); |
| 2047 | Output_section* stab_sec; |
| 2048 | stab_sec = this->find_output_section(stab_name.c_str()); |
| 2049 | if (stab_sec != NULL) |
| 2050 | stab_sec->set_link_section(*p); |
| 2051 | } |
| 2052 | } |
| 2053 | |
| 2054 | // Create .gnu_incremental_inputs and .gnu_incremental_strtab sections needed |
| 2055 | // for the next run of incremental linking to check what has changed. |
| 2056 | |
| 2057 | void |
| 2058 | Layout::create_incremental_info_sections() |
| 2059 | { |
| 2060 | gold_assert(this->incremental_inputs_ != NULL); |
| 2061 | |
| 2062 | // Add the .gnu_incremental_inputs section. |
| 2063 | const char *incremental_inputs_name = |
| 2064 | this->namepool_.add(".gnu_incremental_inputs", false, NULL); |
| 2065 | Output_section* inputs_os = |
| 2066 | this->make_output_section(incremental_inputs_name, |
| 2067 | elfcpp::SHT_GNU_INCREMENTAL_INPUTS, 0, |
| 2068 | false, false, false, false, false); |
| 2069 | Output_section_data* posd = |
| 2070 | this->incremental_inputs_->create_incremental_inputs_section_data(); |
| 2071 | inputs_os->add_output_section_data(posd); |
| 2072 | |
| 2073 | // Add the .gnu_incremental_strtab section. |
| 2074 | const char *incremental_strtab_name = |
| 2075 | this->namepool_.add(".gnu_incremental_strtab", false, NULL); |
| 2076 | Output_section* strtab_os = this->make_output_section(incremental_strtab_name, |
| 2077 | elfcpp::SHT_STRTAB, |
| 2078 | 0, false, false, |
| 2079 | false, false, false); |
| 2080 | Output_data_strtab* strtab_data = |
| 2081 | new Output_data_strtab(this->incremental_inputs_->get_stringpool()); |
| 2082 | strtab_os->add_output_section_data(strtab_data); |
| 2083 | |
| 2084 | inputs_os->set_link_section(strtab_data); |
| 2085 | } |
| 2086 | |
| 2087 | // Return whether SEG1 should be before SEG2 in the output file. This |
| 2088 | // is based entirely on the segment type and flags. When this is |
| 2089 | // called the segment addresses has normally not yet been set. |
| 2090 | |
| 2091 | bool |
| 2092 | Layout::segment_precedes(const Output_segment* seg1, |
| 2093 | const Output_segment* seg2) |
| 2094 | { |
| 2095 | elfcpp::Elf_Word type1 = seg1->type(); |
| 2096 | elfcpp::Elf_Word type2 = seg2->type(); |
| 2097 | |
| 2098 | // The single PT_PHDR segment is required to precede any loadable |
| 2099 | // segment. We simply make it always first. |
| 2100 | if (type1 == elfcpp::PT_PHDR) |
| 2101 | { |
| 2102 | gold_assert(type2 != elfcpp::PT_PHDR); |
| 2103 | return true; |
| 2104 | } |
| 2105 | if (type2 == elfcpp::PT_PHDR) |
| 2106 | return false; |
| 2107 | |
| 2108 | // The single PT_INTERP segment is required to precede any loadable |
| 2109 | // segment. We simply make it always second. |
| 2110 | if (type1 == elfcpp::PT_INTERP) |
| 2111 | { |
| 2112 | gold_assert(type2 != elfcpp::PT_INTERP); |
| 2113 | return true; |
| 2114 | } |
| 2115 | if (type2 == elfcpp::PT_INTERP) |
| 2116 | return false; |
| 2117 | |
| 2118 | // We then put PT_LOAD segments before any other segments. |
| 2119 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) |
| 2120 | return true; |
| 2121 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) |
| 2122 | return false; |
| 2123 | |
| 2124 | // We put the PT_TLS segment last except for the PT_GNU_RELRO |
| 2125 | // segment, because that is where the dynamic linker expects to find |
| 2126 | // it (this is just for efficiency; other positions would also work |
| 2127 | // correctly). |
| 2128 | if (type1 == elfcpp::PT_TLS |
| 2129 | && type2 != elfcpp::PT_TLS |
| 2130 | && type2 != elfcpp::PT_GNU_RELRO) |
| 2131 | return false; |
| 2132 | if (type2 == elfcpp::PT_TLS |
| 2133 | && type1 != elfcpp::PT_TLS |
| 2134 | && type1 != elfcpp::PT_GNU_RELRO) |
| 2135 | return true; |
| 2136 | |
| 2137 | // We put the PT_GNU_RELRO segment last, because that is where the |
| 2138 | // dynamic linker expects to find it (as with PT_TLS, this is just |
| 2139 | // for efficiency). |
| 2140 | if (type1 == elfcpp::PT_GNU_RELRO && type2 != elfcpp::PT_GNU_RELRO) |
| 2141 | return false; |
| 2142 | if (type2 == elfcpp::PT_GNU_RELRO && type1 != elfcpp::PT_GNU_RELRO) |
| 2143 | return true; |
| 2144 | |
| 2145 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
| 2146 | const elfcpp::Elf_Word flags2 = seg2->flags(); |
| 2147 | |
| 2148 | // The order of non-PT_LOAD segments is unimportant. We simply sort |
| 2149 | // by the numeric segment type and flags values. There should not |
| 2150 | // be more than one segment with the same type and flags. |
| 2151 | if (type1 != elfcpp::PT_LOAD) |
| 2152 | { |
| 2153 | if (type1 != type2) |
| 2154 | return type1 < type2; |
| 2155 | gold_assert(flags1 != flags2); |
| 2156 | return flags1 < flags2; |
| 2157 | } |
| 2158 | |
| 2159 | // If the addresses are set already, sort by load address. |
| 2160 | if (seg1->are_addresses_set()) |
| 2161 | { |
| 2162 | if (!seg2->are_addresses_set()) |
| 2163 | return true; |
| 2164 | |
| 2165 | unsigned int section_count1 = seg1->output_section_count(); |
| 2166 | unsigned int section_count2 = seg2->output_section_count(); |
| 2167 | if (section_count1 == 0 && section_count2 > 0) |
| 2168 | return true; |
| 2169 | if (section_count1 > 0 && section_count2 == 0) |
| 2170 | return false; |
| 2171 | |
| 2172 | uint64_t paddr1 = seg1->first_section_load_address(); |
| 2173 | uint64_t paddr2 = seg2->first_section_load_address(); |
| 2174 | if (paddr1 != paddr2) |
| 2175 | return paddr1 < paddr2; |
| 2176 | } |
| 2177 | else if (seg2->are_addresses_set()) |
| 2178 | return false; |
| 2179 | |
| 2180 | // A segment which holds large data comes after a segment which does |
| 2181 | // not hold large data. |
| 2182 | if (seg1->is_large_data_segment()) |
| 2183 | { |
| 2184 | if (!seg2->is_large_data_segment()) |
| 2185 | return false; |
| 2186 | } |
| 2187 | else if (seg2->is_large_data_segment()) |
| 2188 | return true; |
| 2189 | |
| 2190 | // Otherwise, we sort PT_LOAD segments based on the flags. Readonly |
| 2191 | // segments come before writable segments. Then writable segments |
| 2192 | // with data come before writable segments without data. Then |
| 2193 | // executable segments come before non-executable segments. Then |
| 2194 | // the unlikely case of a non-readable segment comes before the |
| 2195 | // normal case of a readable segment. If there are multiple |
| 2196 | // segments with the same type and flags, we require that the |
| 2197 | // address be set, and we sort by virtual address and then physical |
| 2198 | // address. |
| 2199 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) |
| 2200 | return (flags1 & elfcpp::PF_W) == 0; |
| 2201 | if ((flags1 & elfcpp::PF_W) != 0 |
| 2202 | && seg1->has_any_data_sections() != seg2->has_any_data_sections()) |
| 2203 | return seg1->has_any_data_sections(); |
| 2204 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) |
| 2205 | return (flags1 & elfcpp::PF_X) != 0; |
| 2206 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) |
| 2207 | return (flags1 & elfcpp::PF_R) == 0; |
| 2208 | |
| 2209 | // We shouldn't get here--we shouldn't create segments which we |
| 2210 | // can't distinguish. |
| 2211 | gold_unreachable(); |
| 2212 | } |
| 2213 | |
| 2214 | // Increase OFF so that it is congruent to ADDR modulo ABI_PAGESIZE. |
| 2215 | |
| 2216 | static off_t |
| 2217 | align_file_offset(off_t off, uint64_t addr, uint64_t abi_pagesize) |
| 2218 | { |
| 2219 | uint64_t unsigned_off = off; |
| 2220 | uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1)) |
| 2221 | | (addr & (abi_pagesize - 1))); |
| 2222 | if (aligned_off < unsigned_off) |
| 2223 | aligned_off += abi_pagesize; |
| 2224 | return aligned_off; |
| 2225 | } |
| 2226 | |
| 2227 | // Set the file offsets of all the segments, and all the sections they |
| 2228 | // contain. They have all been created. LOAD_SEG must be be laid out |
| 2229 | // first. Return the offset of the data to follow. |
| 2230 | |
| 2231 | off_t |
| 2232 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
| 2233 | unsigned int *pshndx) |
| 2234 | { |
| 2235 | // Sort them into the final order. |
| 2236 | std::sort(this->segment_list_.begin(), this->segment_list_.end(), |
| 2237 | Layout::Compare_segments()); |
| 2238 | |
| 2239 | // Find the PT_LOAD segments, and set their addresses and offsets |
| 2240 | // and their section's addresses and offsets. |
| 2241 | uint64_t addr; |
| 2242 | if (parameters->options().user_set_Ttext()) |
| 2243 | addr = parameters->options().Ttext(); |
| 2244 | else if (parameters->options().output_is_position_independent()) |
| 2245 | addr = 0; |
| 2246 | else |
| 2247 | addr = target->default_text_segment_address(); |
| 2248 | off_t off = 0; |
| 2249 | |
| 2250 | // If LOAD_SEG is NULL, then the file header and segment headers |
| 2251 | // will not be loadable. But they still need to be at offset 0 in |
| 2252 | // the file. Set their offsets now. |
| 2253 | if (load_seg == NULL) |
| 2254 | { |
| 2255 | for (Data_list::iterator p = this->special_output_list_.begin(); |
| 2256 | p != this->special_output_list_.end(); |
| 2257 | ++p) |
| 2258 | { |
| 2259 | off = align_address(off, (*p)->addralign()); |
| 2260 | (*p)->set_address_and_file_offset(0, off); |
| 2261 | off += (*p)->data_size(); |
| 2262 | } |
| 2263 | } |
| 2264 | |
| 2265 | unsigned int increase_relro = this->increase_relro_; |
| 2266 | if (this->script_options_->saw_sections_clause()) |
| 2267 | increase_relro = 0; |
| 2268 | |
| 2269 | const bool check_sections = parameters->options().check_sections(); |
| 2270 | Output_segment* last_load_segment = NULL; |
| 2271 | |
| 2272 | bool was_readonly = false; |
| 2273 | for (Segment_list::iterator p = this->segment_list_.begin(); |
| 2274 | p != this->segment_list_.end(); |
| 2275 | ++p) |
| 2276 | { |
| 2277 | if ((*p)->type() == elfcpp::PT_LOAD) |
| 2278 | { |
| 2279 | if (load_seg != NULL && load_seg != *p) |
| 2280 | gold_unreachable(); |
| 2281 | load_seg = NULL; |
| 2282 | |
| 2283 | bool are_addresses_set = (*p)->are_addresses_set(); |
| 2284 | if (are_addresses_set) |
| 2285 | { |
| 2286 | // When it comes to setting file offsets, we care about |
| 2287 | // the physical address. |
| 2288 | addr = (*p)->paddr(); |
| 2289 | } |
| 2290 | else if (parameters->options().user_set_Tdata() |
| 2291 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
| 2292 | && (!parameters->options().user_set_Tbss() |
| 2293 | || (*p)->has_any_data_sections())) |
| 2294 | { |
| 2295 | addr = parameters->options().Tdata(); |
| 2296 | are_addresses_set = true; |
| 2297 | } |
| 2298 | else if (parameters->options().user_set_Tbss() |
| 2299 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
| 2300 | && !(*p)->has_any_data_sections()) |
| 2301 | { |
| 2302 | addr = parameters->options().Tbss(); |
| 2303 | are_addresses_set = true; |
| 2304 | } |
| 2305 | |
| 2306 | uint64_t orig_addr = addr; |
| 2307 | uint64_t orig_off = off; |
| 2308 | |
| 2309 | uint64_t aligned_addr = 0; |
| 2310 | uint64_t abi_pagesize = target->abi_pagesize(); |
| 2311 | uint64_t common_pagesize = target->common_pagesize(); |
| 2312 | |
| 2313 | if (!parameters->options().nmagic() |
| 2314 | && !parameters->options().omagic()) |
| 2315 | (*p)->set_minimum_p_align(common_pagesize); |
| 2316 | |
| 2317 | if (!are_addresses_set) |
| 2318 | { |
| 2319 | // If the last segment was readonly, and this one is |
| 2320 | // not, then skip the address forward one page, |
| 2321 | // maintaining the same position within the page. This |
| 2322 | // lets us store both segments overlapping on a single |
| 2323 | // page in the file, but the loader will put them on |
| 2324 | // different pages in memory. |
| 2325 | |
| 2326 | addr = align_address(addr, (*p)->maximum_alignment()); |
| 2327 | aligned_addr = addr; |
| 2328 | |
| 2329 | if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0) |
| 2330 | { |
| 2331 | if ((addr & (abi_pagesize - 1)) != 0) |
| 2332 | addr = addr + abi_pagesize; |
| 2333 | } |
| 2334 | |
| 2335 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
| 2336 | } |
| 2337 | |
| 2338 | if (!parameters->options().nmagic() |
| 2339 | && !parameters->options().omagic()) |
| 2340 | off = align_file_offset(off, addr, abi_pagesize); |
| 2341 | else if (load_seg == NULL) |
| 2342 | { |
| 2343 | // This is -N or -n with a section script which prevents |
| 2344 | // us from using a load segment. We need to ensure that |
| 2345 | // the file offset is aligned to the alignment of the |
| 2346 | // segment. This is because the linker script |
| 2347 | // implicitly assumed a zero offset. If we don't align |
| 2348 | // here, then the alignment of the sections in the |
| 2349 | // linker script may not match the alignment of the |
| 2350 | // sections in the set_section_addresses call below, |
| 2351 | // causing an error about dot moving backward. |
| 2352 | off = align_address(off, (*p)->maximum_alignment()); |
| 2353 | } |
| 2354 | |
| 2355 | unsigned int shndx_hold = *pshndx; |
| 2356 | uint64_t new_addr = (*p)->set_section_addresses(this, false, addr, |
| 2357 | increase_relro, |
| 2358 | &off, pshndx); |
| 2359 | |
| 2360 | // Now that we know the size of this segment, we may be able |
| 2361 | // to save a page in memory, at the cost of wasting some |
| 2362 | // file space, by instead aligning to the start of a new |
| 2363 | // page. Here we use the real machine page size rather than |
| 2364 | // the ABI mandated page size. |
| 2365 | |
| 2366 | if (!are_addresses_set && aligned_addr != addr) |
| 2367 | { |
| 2368 | uint64_t first_off = (common_pagesize |
| 2369 | - (aligned_addr |
| 2370 | & (common_pagesize - 1))); |
| 2371 | uint64_t last_off = new_addr & (common_pagesize - 1); |
| 2372 | if (first_off > 0 |
| 2373 | && last_off > 0 |
| 2374 | && ((aligned_addr & ~ (common_pagesize - 1)) |
| 2375 | != (new_addr & ~ (common_pagesize - 1))) |
| 2376 | && first_off + last_off <= common_pagesize) |
| 2377 | { |
| 2378 | *pshndx = shndx_hold; |
| 2379 | addr = align_address(aligned_addr, common_pagesize); |
| 2380 | addr = align_address(addr, (*p)->maximum_alignment()); |
| 2381 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
| 2382 | off = align_file_offset(off, addr, abi_pagesize); |
| 2383 | new_addr = (*p)->set_section_addresses(this, true, addr, |
| 2384 | increase_relro, |
| 2385 | &off, pshndx); |
| 2386 | } |
| 2387 | } |
| 2388 | |
| 2389 | addr = new_addr; |
| 2390 | |
| 2391 | if (((*p)->flags() & elfcpp::PF_W) == 0) |
| 2392 | was_readonly = true; |
| 2393 | |
| 2394 | // Implement --check-sections. We know that the segments |
| 2395 | // are sorted by LMA. |
| 2396 | if (check_sections && last_load_segment != NULL) |
| 2397 | { |
| 2398 | gold_assert(last_load_segment->paddr() <= (*p)->paddr()); |
| 2399 | if (last_load_segment->paddr() + last_load_segment->memsz() |
| 2400 | > (*p)->paddr()) |
| 2401 | { |
| 2402 | unsigned long long lb1 = last_load_segment->paddr(); |
| 2403 | unsigned long long le1 = lb1 + last_load_segment->memsz(); |
| 2404 | unsigned long long lb2 = (*p)->paddr(); |
| 2405 | unsigned long long le2 = lb2 + (*p)->memsz(); |
| 2406 | gold_error(_("load segment overlap [0x%llx -> 0x%llx] and " |
| 2407 | "[0x%llx -> 0x%llx]"), |
| 2408 | lb1, le1, lb2, le2); |
| 2409 | } |
| 2410 | } |
| 2411 | last_load_segment = *p; |
| 2412 | } |
| 2413 | } |
| 2414 | |
| 2415 | // Handle the non-PT_LOAD segments, setting their offsets from their |
| 2416 | // section's offsets. |
| 2417 | for (Segment_list::iterator p = this->segment_list_.begin(); |
| 2418 | p != this->segment_list_.end(); |
| 2419 | ++p) |
| 2420 | { |
| 2421 | if ((*p)->type() != elfcpp::PT_LOAD) |
| 2422 | (*p)->set_offset((*p)->type() == elfcpp::PT_GNU_RELRO |
| 2423 | ? increase_relro |
| 2424 | : 0); |
| 2425 | } |
| 2426 | |
| 2427 | // Set the TLS offsets for each section in the PT_TLS segment. |
| 2428 | if (this->tls_segment_ != NULL) |
| 2429 | this->tls_segment_->set_tls_offsets(); |
| 2430 | |
| 2431 | return off; |
| 2432 | } |
| 2433 | |
| 2434 | // Set the offsets of all the allocated sections when doing a |
| 2435 | // relocatable link. This does the same jobs as set_segment_offsets, |
| 2436 | // only for a relocatable link. |
| 2437 | |
| 2438 | off_t |
| 2439 | Layout::set_relocatable_section_offsets(Output_data* file_header, |
| 2440 | unsigned int *pshndx) |
| 2441 | { |
| 2442 | off_t off = 0; |
| 2443 | |
| 2444 | file_header->set_address_and_file_offset(0, 0); |
| 2445 | off += file_header->data_size(); |
| 2446 | |
| 2447 | for (Section_list::iterator p = this->section_list_.begin(); |
| 2448 | p != this->section_list_.end(); |
| 2449 | ++p) |
| 2450 | { |
| 2451 | // We skip unallocated sections here, except that group sections |
| 2452 | // have to come first. |
| 2453 | if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0 |
| 2454 | && (*p)->type() != elfcpp::SHT_GROUP) |
| 2455 | continue; |
| 2456 | |
| 2457 | off = align_address(off, (*p)->addralign()); |
| 2458 | |
| 2459 | // The linker script might have set the address. |
| 2460 | if (!(*p)->is_address_valid()) |
| 2461 | (*p)->set_address(0); |
| 2462 | (*p)->set_file_offset(off); |
| 2463 | (*p)->finalize_data_size(); |
| 2464 | off += (*p)->data_size(); |
| 2465 | |
| 2466 | (*p)->set_out_shndx(*pshndx); |
| 2467 | ++*pshndx; |
| 2468 | } |
| 2469 | |
| 2470 | return off; |
| 2471 | } |
| 2472 | |
| 2473 | // Set the file offset of all the sections not associated with a |
| 2474 | // segment. |
| 2475 | |
| 2476 | off_t |
| 2477 | Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass) |
| 2478 | { |
| 2479 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
| 2480 | p != this->unattached_section_list_.end(); |
| 2481 | ++p) |
| 2482 | { |
| 2483 | // The symtab section is handled in create_symtab_sections. |
| 2484 | if (*p == this->symtab_section_) |
| 2485 | continue; |
| 2486 | |
| 2487 | // If we've already set the data size, don't set it again. |
| 2488 | if ((*p)->is_offset_valid() && (*p)->is_data_size_valid()) |
| 2489 | continue; |
| 2490 | |
| 2491 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
| 2492 | && (*p)->requires_postprocessing()) |
| 2493 | { |
| 2494 | (*p)->create_postprocessing_buffer(); |
| 2495 | this->any_postprocessing_sections_ = true; |
| 2496 | } |
| 2497 | |
| 2498 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
| 2499 | && (*p)->after_input_sections()) |
| 2500 | continue; |
| 2501 | else if (pass == POSTPROCESSING_SECTIONS_PASS |
| 2502 | && (!(*p)->after_input_sections() |
| 2503 | || (*p)->type() == elfcpp::SHT_STRTAB)) |
| 2504 | continue; |
| 2505 | else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS |
| 2506 | && (!(*p)->after_input_sections() |
| 2507 | || (*p)->type() != elfcpp::SHT_STRTAB)) |
| 2508 | continue; |
| 2509 | |
| 2510 | off = align_address(off, (*p)->addralign()); |
| 2511 | (*p)->set_file_offset(off); |
| 2512 | (*p)->finalize_data_size(); |
| 2513 | off += (*p)->data_size(); |
| 2514 | |
| 2515 | // At this point the name must be set. |
| 2516 | if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS) |
| 2517 | this->namepool_.add((*p)->name(), false, NULL); |
| 2518 | } |
| 2519 | return off; |
| 2520 | } |
| 2521 | |
| 2522 | // Set the section indexes of all the sections not associated with a |
| 2523 | // segment. |
| 2524 | |
| 2525 | unsigned int |
| 2526 | Layout::set_section_indexes(unsigned int shndx) |
| 2527 | { |
| 2528 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
| 2529 | p != this->unattached_section_list_.end(); |
| 2530 | ++p) |
| 2531 | { |
| 2532 | if (!(*p)->has_out_shndx()) |
| 2533 | { |
| 2534 | (*p)->set_out_shndx(shndx); |
| 2535 | ++shndx; |
| 2536 | } |
| 2537 | } |
| 2538 | return shndx; |
| 2539 | } |
| 2540 | |
| 2541 | // Set the section addresses according to the linker script. This is |
| 2542 | // only called when we see a SECTIONS clause. This returns the |
| 2543 | // program segment which should hold the file header and segment |
| 2544 | // headers, if any. It will return NULL if they should not be in a |
| 2545 | // segment. |
| 2546 | |
| 2547 | Output_segment* |
| 2548 | Layout::set_section_addresses_from_script(Symbol_table* symtab) |
| 2549 | { |
| 2550 | Script_sections* ss = this->script_options_->script_sections(); |
| 2551 | gold_assert(ss->saw_sections_clause()); |
| 2552 | return this->script_options_->set_section_addresses(symtab, this); |
| 2553 | } |
| 2554 | |
| 2555 | // Place the orphan sections in the linker script. |
| 2556 | |
| 2557 | void |
| 2558 | Layout::place_orphan_sections_in_script() |
| 2559 | { |
| 2560 | Script_sections* ss = this->script_options_->script_sections(); |
| 2561 | gold_assert(ss->saw_sections_clause()); |
| 2562 | |
| 2563 | // Place each orphaned output section in the script. |
| 2564 | for (Section_list::iterator p = this->section_list_.begin(); |
| 2565 | p != this->section_list_.end(); |
| 2566 | ++p) |
| 2567 | { |
| 2568 | if (!(*p)->found_in_sections_clause()) |
| 2569 | ss->place_orphan(*p); |
| 2570 | } |
| 2571 | } |
| 2572 | |
| 2573 | // Count the local symbols in the regular symbol table and the dynamic |
| 2574 | // symbol table, and build the respective string pools. |
| 2575 | |
| 2576 | void |
| 2577 | Layout::count_local_symbols(const Task* task, |
| 2578 | const Input_objects* input_objects) |
| 2579 | { |
| 2580 | // First, figure out an upper bound on the number of symbols we'll |
| 2581 | // be inserting into each pool. This helps us create the pools with |
| 2582 | // the right size, to avoid unnecessary hashtable resizing. |
| 2583 | unsigned int symbol_count = 0; |
| 2584 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
| 2585 | p != input_objects->relobj_end(); |
| 2586 | ++p) |
| 2587 | symbol_count += (*p)->local_symbol_count(); |
| 2588 | |
| 2589 | // Go from "upper bound" to "estimate." We overcount for two |
| 2590 | // reasons: we double-count symbols that occur in more than one |
| 2591 | // object file, and we count symbols that are dropped from the |
| 2592 | // output. Add it all together and assume we overcount by 100%. |
| 2593 | symbol_count /= 2; |
| 2594 | |
| 2595 | // We assume all symbols will go into both the sympool and dynpool. |
| 2596 | this->sympool_.reserve(symbol_count); |
| 2597 | this->dynpool_.reserve(symbol_count); |
| 2598 | |
| 2599 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
| 2600 | p != input_objects->relobj_end(); |
| 2601 | ++p) |
| 2602 | { |
| 2603 | Task_lock_obj<Object> tlo(task, *p); |
| 2604 | (*p)->count_local_symbols(&this->sympool_, &this->dynpool_); |
| 2605 | } |
| 2606 | } |
| 2607 | |
| 2608 | // Create the symbol table sections. Here we also set the final |
| 2609 | // values of the symbols. At this point all the loadable sections are |
| 2610 | // fully laid out. SHNUM is the number of sections so far. |
| 2611 | |
| 2612 | void |
| 2613 | Layout::create_symtab_sections(const Input_objects* input_objects, |
| 2614 | Symbol_table* symtab, |
| 2615 | unsigned int shnum, |
| 2616 | off_t* poff) |
| 2617 | { |
| 2618 | int symsize; |
| 2619 | unsigned int align; |
| 2620 | if (parameters->target().get_size() == 32) |
| 2621 | { |
| 2622 | symsize = elfcpp::Elf_sizes<32>::sym_size; |
| 2623 | align = 4; |
| 2624 | } |
| 2625 | else if (parameters->target().get_size() == 64) |
| 2626 | { |
| 2627 | symsize = elfcpp::Elf_sizes<64>::sym_size; |
| 2628 | align = 8; |
| 2629 | } |
| 2630 | else |
| 2631 | gold_unreachable(); |
| 2632 | |
| 2633 | off_t off = *poff; |
| 2634 | off = align_address(off, align); |
| 2635 | off_t startoff = off; |
| 2636 | |
| 2637 | // Save space for the dummy symbol at the start of the section. We |
| 2638 | // never bother to write this out--it will just be left as zero. |
| 2639 | off += symsize; |
| 2640 | unsigned int local_symbol_index = 1; |
| 2641 | |
| 2642 | // Add STT_SECTION symbols for each Output section which needs one. |
| 2643 | for (Section_list::iterator p = this->section_list_.begin(); |
| 2644 | p != this->section_list_.end(); |
| 2645 | ++p) |
| 2646 | { |
| 2647 | if (!(*p)->needs_symtab_index()) |
| 2648 | (*p)->set_symtab_index(-1U); |
| 2649 | else |
| 2650 | { |
| 2651 | (*p)->set_symtab_index(local_symbol_index); |
| 2652 | ++local_symbol_index; |
| 2653 | off += symsize; |
| 2654 | } |
| 2655 | } |
| 2656 | |
| 2657 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
| 2658 | p != input_objects->relobj_end(); |
| 2659 | ++p) |
| 2660 | { |
| 2661 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
| 2662 | off, symtab); |
| 2663 | off += (index - local_symbol_index) * symsize; |
| 2664 | local_symbol_index = index; |
| 2665 | } |
| 2666 | |
| 2667 | unsigned int local_symcount = local_symbol_index; |
| 2668 | gold_assert(static_cast<off_t>(local_symcount * symsize) == off - startoff); |
| 2669 | |
| 2670 | off_t dynoff; |
| 2671 | size_t dyn_global_index; |
| 2672 | size_t dyncount; |
| 2673 | if (this->dynsym_section_ == NULL) |
| 2674 | { |
| 2675 | dynoff = 0; |
| 2676 | dyn_global_index = 0; |
| 2677 | dyncount = 0; |
| 2678 | } |
| 2679 | else |
| 2680 | { |
| 2681 | dyn_global_index = this->dynsym_section_->info(); |
| 2682 | off_t locsize = dyn_global_index * this->dynsym_section_->entsize(); |
| 2683 | dynoff = this->dynsym_section_->offset() + locsize; |
| 2684 | dyncount = (this->dynsym_section_->data_size() - locsize) / symsize; |
| 2685 | gold_assert(static_cast<off_t>(dyncount * symsize) |
| 2686 | == this->dynsym_section_->data_size() - locsize); |
| 2687 | } |
| 2688 | |
| 2689 | off = symtab->finalize(off, dynoff, dyn_global_index, dyncount, |
| 2690 | &this->sympool_, &local_symcount); |
| 2691 | |
| 2692 | if (!parameters->options().strip_all()) |
| 2693 | { |
| 2694 | this->sympool_.set_string_offsets(); |
| 2695 | |
| 2696 | const char* symtab_name = this->namepool_.add(".symtab", false, NULL); |
| 2697 | Output_section* osymtab = this->make_output_section(symtab_name, |
| 2698 | elfcpp::SHT_SYMTAB, |
| 2699 | 0, false, false, |
| 2700 | false, false, false); |
| 2701 | this->symtab_section_ = osymtab; |
| 2702 | |
| 2703 | Output_section_data* pos = new Output_data_fixed_space(off - startoff, |
| 2704 | align, |
| 2705 | "** symtab"); |
| 2706 | osymtab->add_output_section_data(pos); |
| 2707 | |
| 2708 | // We generate a .symtab_shndx section if we have more than |
| 2709 | // SHN_LORESERVE sections. Technically it is possible that we |
| 2710 | // don't need one, because it is possible that there are no |
| 2711 | // symbols in any of sections with indexes larger than |
| 2712 | // SHN_LORESERVE. That is probably unusual, though, and it is |
| 2713 | // easier to always create one than to compute section indexes |
| 2714 | // twice (once here, once when writing out the symbols). |
| 2715 | if (shnum >= elfcpp::SHN_LORESERVE) |
| 2716 | { |
| 2717 | const char* symtab_xindex_name = this->namepool_.add(".symtab_shndx", |
| 2718 | false, NULL); |
| 2719 | Output_section* osymtab_xindex = |
| 2720 | this->make_output_section(symtab_xindex_name, |
| 2721 | elfcpp::SHT_SYMTAB_SHNDX, 0, false, |
| 2722 | false, false, false, false); |
| 2723 | |
| 2724 | size_t symcount = (off - startoff) / symsize; |
| 2725 | this->symtab_xindex_ = new Output_symtab_xindex(symcount); |
| 2726 | |
| 2727 | osymtab_xindex->add_output_section_data(this->symtab_xindex_); |
| 2728 | |
| 2729 | osymtab_xindex->set_link_section(osymtab); |
| 2730 | osymtab_xindex->set_addralign(4); |
| 2731 | osymtab_xindex->set_entsize(4); |
| 2732 | |
| 2733 | osymtab_xindex->set_after_input_sections(); |
| 2734 | |
| 2735 | // This tells the driver code to wait until the symbol table |
| 2736 | // has written out before writing out the postprocessing |
| 2737 | // sections, including the .symtab_shndx section. |
| 2738 | this->any_postprocessing_sections_ = true; |
| 2739 | } |
| 2740 | |
| 2741 | const char* strtab_name = this->namepool_.add(".strtab", false, NULL); |
| 2742 | Output_section* ostrtab = this->make_output_section(strtab_name, |
| 2743 | elfcpp::SHT_STRTAB, |
| 2744 | 0, false, false, |
| 2745 | false, false, false); |
| 2746 | |
| 2747 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); |
| 2748 | ostrtab->add_output_section_data(pstr); |
| 2749 | |
| 2750 | osymtab->set_file_offset(startoff); |
| 2751 | osymtab->finalize_data_size(); |
| 2752 | osymtab->set_link_section(ostrtab); |
| 2753 | osymtab->set_info(local_symcount); |
| 2754 | osymtab->set_entsize(symsize); |
| 2755 | |
| 2756 | *poff = off; |
| 2757 | } |
| 2758 | } |
| 2759 | |
| 2760 | // Create the .shstrtab section, which holds the names of the |
| 2761 | // sections. At the time this is called, we have created all the |
| 2762 | // output sections except .shstrtab itself. |
| 2763 | |
| 2764 | Output_section* |
| 2765 | Layout::create_shstrtab() |
| 2766 | { |
| 2767 | // FIXME: We don't need to create a .shstrtab section if we are |
| 2768 | // stripping everything. |
| 2769 | |
| 2770 | const char* name = this->namepool_.add(".shstrtab", false, NULL); |
| 2771 | |
| 2772 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0, |
| 2773 | false, false, false, false, |
| 2774 | false); |
| 2775 | |
| 2776 | if (strcmp(parameters->options().compress_debug_sections(), "none") != 0) |
| 2777 | { |
| 2778 | // We can't write out this section until we've set all the |
| 2779 | // section names, and we don't set the names of compressed |
| 2780 | // output sections until relocations are complete. FIXME: With |
| 2781 | // the current names we use, this is unnecessary. |
| 2782 | os->set_after_input_sections(); |
| 2783 | } |
| 2784 | |
| 2785 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
| 2786 | os->add_output_section_data(posd); |
| 2787 | |
| 2788 | return os; |
| 2789 | } |
| 2790 | |
| 2791 | // Create the section headers. SIZE is 32 or 64. OFF is the file |
| 2792 | // offset. |
| 2793 | |
| 2794 | void |
| 2795 | Layout::create_shdrs(const Output_section* shstrtab_section, off_t* poff) |
| 2796 | { |
| 2797 | Output_section_headers* oshdrs; |
| 2798 | oshdrs = new Output_section_headers(this, |
| 2799 | &this->segment_list_, |
| 2800 | &this->section_list_, |
| 2801 | &this->unattached_section_list_, |
| 2802 | &this->namepool_, |
| 2803 | shstrtab_section); |
| 2804 | off_t off = align_address(*poff, oshdrs->addralign()); |
| 2805 | oshdrs->set_address_and_file_offset(0, off); |
| 2806 | off += oshdrs->data_size(); |
| 2807 | *poff = off; |
| 2808 | this->section_headers_ = oshdrs; |
| 2809 | } |
| 2810 | |
| 2811 | // Count the allocated sections. |
| 2812 | |
| 2813 | size_t |
| 2814 | Layout::allocated_output_section_count() const |
| 2815 | { |
| 2816 | size_t section_count = 0; |
| 2817 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
| 2818 | p != this->segment_list_.end(); |
| 2819 | ++p) |
| 2820 | section_count += (*p)->output_section_count(); |
| 2821 | return section_count; |
| 2822 | } |
| 2823 | |
| 2824 | // Create the dynamic symbol table. |
| 2825 | |
| 2826 | void |
| 2827 | Layout::create_dynamic_symtab(const Input_objects* input_objects, |
| 2828 | Symbol_table* symtab, |
| 2829 | Output_section **pdynstr, |
| 2830 | unsigned int* plocal_dynamic_count, |
| 2831 | std::vector<Symbol*>* pdynamic_symbols, |
| 2832 | Versions* pversions) |
| 2833 | { |
| 2834 | // Count all the symbols in the dynamic symbol table, and set the |
| 2835 | // dynamic symbol indexes. |
| 2836 | |
| 2837 | // Skip symbol 0, which is always all zeroes. |
| 2838 | unsigned int index = 1; |
| 2839 | |
| 2840 | // Add STT_SECTION symbols for each Output section which needs one. |
| 2841 | for (Section_list::iterator p = this->section_list_.begin(); |
| 2842 | p != this->section_list_.end(); |
| 2843 | ++p) |
| 2844 | { |
| 2845 | if (!(*p)->needs_dynsym_index()) |
| 2846 | (*p)->set_dynsym_index(-1U); |
| 2847 | else |
| 2848 | { |
| 2849 | (*p)->set_dynsym_index(index); |
| 2850 | ++index; |
| 2851 | } |
| 2852 | } |
| 2853 | |
| 2854 | // Count the local symbols that need to go in the dynamic symbol table, |
| 2855 | // and set the dynamic symbol indexes. |
| 2856 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
| 2857 | p != input_objects->relobj_end(); |
| 2858 | ++p) |
| 2859 | { |
| 2860 | unsigned int new_index = (*p)->set_local_dynsym_indexes(index); |
| 2861 | index = new_index; |
| 2862 | } |
| 2863 | |
| 2864 | unsigned int local_symcount = index; |
| 2865 | *plocal_dynamic_count = local_symcount; |
| 2866 | |
| 2867 | index = symtab->set_dynsym_indexes(index, pdynamic_symbols, |
| 2868 | &this->dynpool_, pversions); |
| 2869 | |
| 2870 | int symsize; |
| 2871 | unsigned int align; |
| 2872 | const int size = parameters->target().get_size(); |
| 2873 | if (size == 32) |
| 2874 | { |
| 2875 | symsize = elfcpp::Elf_sizes<32>::sym_size; |
| 2876 | align = 4; |
| 2877 | } |
| 2878 | else if (size == 64) |
| 2879 | { |
| 2880 | symsize = elfcpp::Elf_sizes<64>::sym_size; |
| 2881 | align = 8; |
| 2882 | } |
| 2883 | else |
| 2884 | gold_unreachable(); |
| 2885 | |
| 2886 | // Create the dynamic symbol table section. |
| 2887 | |
| 2888 | Output_section* dynsym = this->choose_output_section(NULL, ".dynsym", |
| 2889 | elfcpp::SHT_DYNSYM, |
| 2890 | elfcpp::SHF_ALLOC, |
| 2891 | false, false, true, |
| 2892 | false, false, false); |
| 2893 | |
| 2894 | Output_section_data* odata = new Output_data_fixed_space(index * symsize, |
| 2895 | align, |
| 2896 | "** dynsym"); |
| 2897 | dynsym->add_output_section_data(odata); |
| 2898 | |
| 2899 | dynsym->set_info(local_symcount); |
| 2900 | dynsym->set_entsize(symsize); |
| 2901 | dynsym->set_addralign(align); |
| 2902 | |
| 2903 | this->dynsym_section_ = dynsym; |
| 2904 | |
| 2905 | Output_data_dynamic* const odyn = this->dynamic_data_; |
| 2906 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); |
| 2907 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); |
| 2908 | |
| 2909 | // If there are more than SHN_LORESERVE allocated sections, we |
| 2910 | // create a .dynsym_shndx section. It is possible that we don't |
| 2911 | // need one, because it is possible that there are no dynamic |
| 2912 | // symbols in any of the sections with indexes larger than |
| 2913 | // SHN_LORESERVE. This is probably unusual, though, and at this |
| 2914 | // time we don't know the actual section indexes so it is |
| 2915 | // inconvenient to check. |
| 2916 | if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE) |
| 2917 | { |
| 2918 | Output_section* dynsym_xindex = |
| 2919 | this->choose_output_section(NULL, ".dynsym_shndx", |
| 2920 | elfcpp::SHT_SYMTAB_SHNDX, |
| 2921 | elfcpp::SHF_ALLOC, |
| 2922 | false, false, true, false, false, false); |
| 2923 | |
| 2924 | this->dynsym_xindex_ = new Output_symtab_xindex(index); |
| 2925 | |
| 2926 | dynsym_xindex->add_output_section_data(this->dynsym_xindex_); |
| 2927 | |
| 2928 | dynsym_xindex->set_link_section(dynsym); |
| 2929 | dynsym_xindex->set_addralign(4); |
| 2930 | dynsym_xindex->set_entsize(4); |
| 2931 | |
| 2932 | dynsym_xindex->set_after_input_sections(); |
| 2933 | |
| 2934 | // This tells the driver code to wait until the symbol table has |
| 2935 | // written out before writing out the postprocessing sections, |
| 2936 | // including the .dynsym_shndx section. |
| 2937 | this->any_postprocessing_sections_ = true; |
| 2938 | } |
| 2939 | |
| 2940 | // Create the dynamic string table section. |
| 2941 | |
| 2942 | Output_section* dynstr = this->choose_output_section(NULL, ".dynstr", |
| 2943 | elfcpp::SHT_STRTAB, |
| 2944 | elfcpp::SHF_ALLOC, |
| 2945 | false, false, true, |
| 2946 | false, false, false); |
| 2947 | |
| 2948 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); |
| 2949 | dynstr->add_output_section_data(strdata); |
| 2950 | |
| 2951 | dynsym->set_link_section(dynstr); |
| 2952 | this->dynamic_section_->set_link_section(dynstr); |
| 2953 | |
| 2954 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); |
| 2955 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); |
| 2956 | |
| 2957 | *pdynstr = dynstr; |
| 2958 | |
| 2959 | // Create the hash tables. |
| 2960 | |
| 2961 | if (strcmp(parameters->options().hash_style(), "sysv") == 0 |
| 2962 | || strcmp(parameters->options().hash_style(), "both") == 0) |
| 2963 | { |
| 2964 | unsigned char* phash; |
| 2965 | unsigned int hashlen; |
| 2966 | Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount, |
| 2967 | &phash, &hashlen); |
| 2968 | |
| 2969 | Output_section* hashsec = this->choose_output_section(NULL, ".hash", |
| 2970 | elfcpp::SHT_HASH, |
| 2971 | elfcpp::SHF_ALLOC, |
| 2972 | false, false, true, |
| 2973 | false, false, |
| 2974 | false); |
| 2975 | |
| 2976 | Output_section_data* hashdata = new Output_data_const_buffer(phash, |
| 2977 | hashlen, |
| 2978 | align, |
| 2979 | "** hash"); |
| 2980 | hashsec->add_output_section_data(hashdata); |
| 2981 | |
| 2982 | hashsec->set_link_section(dynsym); |
| 2983 | hashsec->set_entsize(4); |
| 2984 | |
| 2985 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); |
| 2986 | } |
| 2987 | |
| 2988 | if (strcmp(parameters->options().hash_style(), "gnu") == 0 |
| 2989 | || strcmp(parameters->options().hash_style(), "both") == 0) |
| 2990 | { |
| 2991 | unsigned char* phash; |
| 2992 | unsigned int hashlen; |
| 2993 | Dynobj::create_gnu_hash_table(*pdynamic_symbols, local_symcount, |
| 2994 | &phash, &hashlen); |
| 2995 | |
| 2996 | Output_section* hashsec = this->choose_output_section(NULL, ".gnu.hash", |
| 2997 | elfcpp::SHT_GNU_HASH, |
| 2998 | elfcpp::SHF_ALLOC, |
| 2999 | false, false, true, |
| 3000 | false, false, |
| 3001 | false); |
| 3002 | |
| 3003 | Output_section_data* hashdata = new Output_data_const_buffer(phash, |
| 3004 | hashlen, |
| 3005 | align, |
| 3006 | "** hash"); |
| 3007 | hashsec->add_output_section_data(hashdata); |
| 3008 | |
| 3009 | hashsec->set_link_section(dynsym); |
| 3010 | |
| 3011 | // For a 64-bit target, the entries in .gnu.hash do not have a |
| 3012 | // uniform size, so we only set the entry size for a 32-bit |
| 3013 | // target. |
| 3014 | if (parameters->target().get_size() == 32) |
| 3015 | hashsec->set_entsize(4); |
| 3016 | |
| 3017 | odyn->add_section_address(elfcpp::DT_GNU_HASH, hashsec); |
| 3018 | } |
| 3019 | } |
| 3020 | |
| 3021 | // Assign offsets to each local portion of the dynamic symbol table. |
| 3022 | |
| 3023 | void |
| 3024 | Layout::assign_local_dynsym_offsets(const Input_objects* input_objects) |
| 3025 | { |
| 3026 | Output_section* dynsym = this->dynsym_section_; |
| 3027 | gold_assert(dynsym != NULL); |
| 3028 | |
| 3029 | off_t off = dynsym->offset(); |
| 3030 | |
| 3031 | // Skip the dummy symbol at the start of the section. |
| 3032 | off += dynsym->entsize(); |
| 3033 | |
| 3034 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
| 3035 | p != input_objects->relobj_end(); |
| 3036 | ++p) |
| 3037 | { |
| 3038 | unsigned int count = (*p)->set_local_dynsym_offset(off); |
| 3039 | off += count * dynsym->entsize(); |
| 3040 | } |
| 3041 | } |
| 3042 | |
| 3043 | // Create the version sections. |
| 3044 | |
| 3045 | void |
| 3046 | Layout::create_version_sections(const Versions* versions, |
| 3047 | const Symbol_table* symtab, |
| 3048 | unsigned int local_symcount, |
| 3049 | const std::vector<Symbol*>& dynamic_symbols, |
| 3050 | const Output_section* dynstr) |
| 3051 | { |
| 3052 | if (!versions->any_defs() && !versions->any_needs()) |
| 3053 | return; |
| 3054 | |
| 3055 | switch (parameters->size_and_endianness()) |
| 3056 | { |
| 3057 | #ifdef HAVE_TARGET_32_LITTLE |
| 3058 | case Parameters::TARGET_32_LITTLE: |
| 3059 | this->sized_create_version_sections<32, false>(versions, symtab, |
| 3060 | local_symcount, |
| 3061 | dynamic_symbols, dynstr); |
| 3062 | break; |
| 3063 | #endif |
| 3064 | #ifdef HAVE_TARGET_32_BIG |
| 3065 | case Parameters::TARGET_32_BIG: |
| 3066 | this->sized_create_version_sections<32, true>(versions, symtab, |
| 3067 | local_symcount, |
| 3068 | dynamic_symbols, dynstr); |
| 3069 | break; |
| 3070 | #endif |
| 3071 | #ifdef HAVE_TARGET_64_LITTLE |
| 3072 | case Parameters::TARGET_64_LITTLE: |
| 3073 | this->sized_create_version_sections<64, false>(versions, symtab, |
| 3074 | local_symcount, |
| 3075 | dynamic_symbols, dynstr); |
| 3076 | break; |
| 3077 | #endif |
| 3078 | #ifdef HAVE_TARGET_64_BIG |
| 3079 | case Parameters::TARGET_64_BIG: |
| 3080 | this->sized_create_version_sections<64, true>(versions, symtab, |
| 3081 | local_symcount, |
| 3082 | dynamic_symbols, dynstr); |
| 3083 | break; |
| 3084 | #endif |
| 3085 | default: |
| 3086 | gold_unreachable(); |
| 3087 | } |
| 3088 | } |
| 3089 | |
| 3090 | // Create the version sections, sized version. |
| 3091 | |
| 3092 | template<int size, bool big_endian> |
| 3093 | void |
| 3094 | Layout::sized_create_version_sections( |
| 3095 | const Versions* versions, |
| 3096 | const Symbol_table* symtab, |
| 3097 | unsigned int local_symcount, |
| 3098 | const std::vector<Symbol*>& dynamic_symbols, |
| 3099 | const Output_section* dynstr) |
| 3100 | { |
| 3101 | Output_section* vsec = this->choose_output_section(NULL, ".gnu.version", |
| 3102 | elfcpp::SHT_GNU_versym, |
| 3103 | elfcpp::SHF_ALLOC, |
| 3104 | false, false, true, |
| 3105 | false, false, false); |
| 3106 | |
| 3107 | unsigned char* vbuf; |
| 3108 | unsigned int vsize; |
| 3109 | versions->symbol_section_contents<size, big_endian>(symtab, &this->dynpool_, |
| 3110 | local_symcount, |
| 3111 | dynamic_symbols, |
| 3112 | &vbuf, &vsize); |
| 3113 | |
| 3114 | Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2, |
| 3115 | "** versions"); |
| 3116 | |
| 3117 | vsec->add_output_section_data(vdata); |
| 3118 | vsec->set_entsize(2); |
| 3119 | vsec->set_link_section(this->dynsym_section_); |
| 3120 | |
| 3121 | Output_data_dynamic* const odyn = this->dynamic_data_; |
| 3122 | odyn->add_section_address(elfcpp::DT_VERSYM, vsec); |
| 3123 | |
| 3124 | if (versions->any_defs()) |
| 3125 | { |
| 3126 | Output_section* vdsec; |
| 3127 | vdsec= this->choose_output_section(NULL, ".gnu.version_d", |
| 3128 | elfcpp::SHT_GNU_verdef, |
| 3129 | elfcpp::SHF_ALLOC, |
| 3130 | false, false, true, false, false, |
| 3131 | false); |
| 3132 | |
| 3133 | unsigned char* vdbuf; |
| 3134 | unsigned int vdsize; |
| 3135 | unsigned int vdentries; |
| 3136 | versions->def_section_contents<size, big_endian>(&this->dynpool_, &vdbuf, |
| 3137 | &vdsize, &vdentries); |
| 3138 | |
| 3139 | Output_section_data* vddata = |
| 3140 | new Output_data_const_buffer(vdbuf, vdsize, 4, "** version defs"); |
| 3141 | |
| 3142 | vdsec->add_output_section_data(vddata); |
| 3143 | vdsec->set_link_section(dynstr); |
| 3144 | vdsec->set_info(vdentries); |
| 3145 | |
| 3146 | odyn->add_section_address(elfcpp::DT_VERDEF, vdsec); |
| 3147 | odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries); |
| 3148 | } |
| 3149 | |
| 3150 | if (versions->any_needs()) |
| 3151 | { |
| 3152 | Output_section* vnsec; |
| 3153 | vnsec = this->choose_output_section(NULL, ".gnu.version_r", |
| 3154 | elfcpp::SHT_GNU_verneed, |
| 3155 | elfcpp::SHF_ALLOC, |
| 3156 | false, false, true, false, false, |
| 3157 | false); |
| 3158 | |
| 3159 | unsigned char* vnbuf; |
| 3160 | unsigned int vnsize; |
| 3161 | unsigned int vnentries; |
| 3162 | versions->need_section_contents<size, big_endian>(&this->dynpool_, |
| 3163 | &vnbuf, &vnsize, |
| 3164 | &vnentries); |
| 3165 | |
| 3166 | Output_section_data* vndata = |
| 3167 | new Output_data_const_buffer(vnbuf, vnsize, 4, "** version refs"); |
| 3168 | |
| 3169 | vnsec->add_output_section_data(vndata); |
| 3170 | vnsec->set_link_section(dynstr); |
| 3171 | vnsec->set_info(vnentries); |
| 3172 | |
| 3173 | odyn->add_section_address(elfcpp::DT_VERNEED, vnsec); |
| 3174 | odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries); |
| 3175 | } |
| 3176 | } |
| 3177 | |
| 3178 | // Create the .interp section and PT_INTERP segment. |
| 3179 | |
| 3180 | void |
| 3181 | Layout::create_interp(const Target* target) |
| 3182 | { |
| 3183 | const char* interp = parameters->options().dynamic_linker(); |
| 3184 | if (interp == NULL) |
| 3185 | { |
| 3186 | interp = target->dynamic_linker(); |
| 3187 | gold_assert(interp != NULL); |
| 3188 | } |
| 3189 | |
| 3190 | size_t len = strlen(interp) + 1; |
| 3191 | |
| 3192 | Output_section_data* odata = new Output_data_const(interp, len, 1); |
| 3193 | |
| 3194 | Output_section* osec = this->choose_output_section(NULL, ".interp", |
| 3195 | elfcpp::SHT_PROGBITS, |
| 3196 | elfcpp::SHF_ALLOC, |
| 3197 | false, true, true, |
| 3198 | false, false, false); |
| 3199 | osec->add_output_section_data(odata); |
| 3200 | |
| 3201 | if (!this->script_options_->saw_phdrs_clause()) |
| 3202 | { |
| 3203 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_INTERP, |
| 3204 | elfcpp::PF_R); |
| 3205 | oseg->add_output_section(osec, elfcpp::PF_R, false); |
| 3206 | } |
| 3207 | } |
| 3208 | |
| 3209 | // Add dynamic tags for the PLT and the dynamic relocs. This is |
| 3210 | // called by the target-specific code. This does nothing if not doing |
| 3211 | // a dynamic link. |
| 3212 | |
| 3213 | // USE_REL is true for REL relocs rather than RELA relocs. |
| 3214 | |
| 3215 | // If PLT_GOT is not NULL, then DT_PLTGOT points to it. |
| 3216 | |
| 3217 | // If PLT_REL is not NULL, it is used for DT_PLTRELSZ, and DT_JMPREL, |
| 3218 | // and we also set DT_PLTREL. We use PLT_REL's output section, since |
| 3219 | // some targets have multiple reloc sections in PLT_REL. |
| 3220 | |
| 3221 | // If DYN_REL is not NULL, it is used for DT_REL/DT_RELA, |
| 3222 | // DT_RELSZ/DT_RELASZ, DT_RELENT/DT_RELAENT. |
| 3223 | |
| 3224 | // If ADD_DEBUG is true, we add a DT_DEBUG entry when generating an |
| 3225 | // executable. |
| 3226 | |
| 3227 | void |
| 3228 | Layout::add_target_dynamic_tags(bool use_rel, const Output_data* plt_got, |
| 3229 | const Output_data* plt_rel, |
| 3230 | const Output_data_reloc_generic* dyn_rel, |
| 3231 | bool add_debug) |
| 3232 | { |
| 3233 | Output_data_dynamic* odyn = this->dynamic_data_; |
| 3234 | if (odyn == NULL) |
| 3235 | return; |
| 3236 | |
| 3237 | if (plt_got != NULL && plt_got->output_section() != NULL) |
| 3238 | odyn->add_section_address(elfcpp::DT_PLTGOT, plt_got); |
| 3239 | |
| 3240 | if (plt_rel != NULL && plt_rel->output_section() != NULL) |
| 3241 | { |
| 3242 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, plt_rel->output_section()); |
| 3243 | odyn->add_section_address(elfcpp::DT_JMPREL, plt_rel->output_section()); |
| 3244 | odyn->add_constant(elfcpp::DT_PLTREL, |
| 3245 | use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA); |
| 3246 | } |
| 3247 | |
| 3248 | if (dyn_rel != NULL && dyn_rel->output_section() != NULL) |
| 3249 | { |
| 3250 | odyn->add_section_address(use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA, |
| 3251 | dyn_rel); |
| 3252 | odyn->add_section_size(use_rel ? elfcpp::DT_RELSZ : elfcpp::DT_RELASZ, |
| 3253 | dyn_rel); |
| 3254 | const int size = parameters->target().get_size(); |
| 3255 | elfcpp::DT rel_tag; |
| 3256 | int rel_size; |
| 3257 | if (use_rel) |
| 3258 | { |
| 3259 | rel_tag = elfcpp::DT_RELENT; |
| 3260 | if (size == 32) |
| 3261 | rel_size = Reloc_types<elfcpp::SHT_REL, 32, false>::reloc_size; |
| 3262 | else if (size == 64) |
| 3263 | rel_size = Reloc_types<elfcpp::SHT_REL, 64, false>::reloc_size; |
| 3264 | else |
| 3265 | gold_unreachable(); |
| 3266 | } |
| 3267 | else |
| 3268 | { |
| 3269 | rel_tag = elfcpp::DT_RELAENT; |
| 3270 | if (size == 32) |
| 3271 | rel_size = Reloc_types<elfcpp::SHT_RELA, 32, false>::reloc_size; |
| 3272 | else if (size == 64) |
| 3273 | rel_size = Reloc_types<elfcpp::SHT_RELA, 64, false>::reloc_size; |
| 3274 | else |
| 3275 | gold_unreachable(); |
| 3276 | } |
| 3277 | odyn->add_constant(rel_tag, rel_size); |
| 3278 | |
| 3279 | if (parameters->options().combreloc()) |
| 3280 | { |
| 3281 | size_t c = dyn_rel->relative_reloc_count(); |
| 3282 | if (c > 0) |
| 3283 | odyn->add_constant((use_rel |
| 3284 | ? elfcpp::DT_RELCOUNT |
| 3285 | : elfcpp::DT_RELACOUNT), |
| 3286 | c); |
| 3287 | } |
| 3288 | } |
| 3289 | |
| 3290 | if (add_debug && !parameters->options().shared()) |
| 3291 | { |
| 3292 | // The value of the DT_DEBUG tag is filled in by the dynamic |
| 3293 | // linker at run time, and used by the debugger. |
| 3294 | odyn->add_constant(elfcpp::DT_DEBUG, 0); |
| 3295 | } |
| 3296 | } |
| 3297 | |
| 3298 | // Finish the .dynamic section and PT_DYNAMIC segment. |
| 3299 | |
| 3300 | void |
| 3301 | Layout::finish_dynamic_section(const Input_objects* input_objects, |
| 3302 | const Symbol_table* symtab) |
| 3303 | { |
| 3304 | if (!this->script_options_->saw_phdrs_clause()) |
| 3305 | { |
| 3306 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC, |
| 3307 | (elfcpp::PF_R |
| 3308 | | elfcpp::PF_W)); |
| 3309 | oseg->add_output_section(this->dynamic_section_, |
| 3310 | elfcpp::PF_R | elfcpp::PF_W, |
| 3311 | false); |
| 3312 | } |
| 3313 | |
| 3314 | Output_data_dynamic* const odyn = this->dynamic_data_; |
| 3315 | |
| 3316 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); |
| 3317 | p != input_objects->dynobj_end(); |
| 3318 | ++p) |
| 3319 | { |
| 3320 | if (!(*p)->is_needed() |
| 3321 | && (*p)->input_file()->options().as_needed()) |
| 3322 | { |
| 3323 | // This dynamic object was linked with --as-needed, but it |
| 3324 | // is not needed. |
| 3325 | continue; |
| 3326 | } |
| 3327 | |
| 3328 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); |
| 3329 | } |
| 3330 | |
| 3331 | if (parameters->options().shared()) |
| 3332 | { |
| 3333 | const char* soname = parameters->options().soname(); |
| 3334 | if (soname != NULL) |
| 3335 | odyn->add_string(elfcpp::DT_SONAME, soname); |
| 3336 | } |
| 3337 | |
| 3338 | Symbol* sym = symtab->lookup(parameters->options().init()); |
| 3339 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
| 3340 | odyn->add_symbol(elfcpp::DT_INIT, sym); |
| 3341 | |
| 3342 | sym = symtab->lookup(parameters->options().fini()); |
| 3343 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
| 3344 | odyn->add_symbol(elfcpp::DT_FINI, sym); |
| 3345 | |
| 3346 | // Look for .init_array, .preinit_array and .fini_array by checking |
| 3347 | // section types. |
| 3348 | for(Layout::Section_list::const_iterator p = this->section_list_.begin(); |
| 3349 | p != this->section_list_.end(); |
| 3350 | ++p) |
| 3351 | switch((*p)->type()) |
| 3352 | { |
| 3353 | case elfcpp::SHT_FINI_ARRAY: |
| 3354 | odyn->add_section_address(elfcpp::DT_FINI_ARRAY, *p); |
| 3355 | odyn->add_section_size(elfcpp::DT_FINI_ARRAYSZ, *p); |
| 3356 | break; |
| 3357 | case elfcpp::SHT_INIT_ARRAY: |
| 3358 | odyn->add_section_address(elfcpp::DT_INIT_ARRAY, *p); |
| 3359 | odyn->add_section_size(elfcpp::DT_INIT_ARRAYSZ, *p); |
| 3360 | break; |
| 3361 | case elfcpp::SHT_PREINIT_ARRAY: |
| 3362 | odyn->add_section_address(elfcpp::DT_PREINIT_ARRAY, *p); |
| 3363 | odyn->add_section_size(elfcpp::DT_PREINIT_ARRAYSZ, *p); |
| 3364 | break; |
| 3365 | default: |
| 3366 | break; |
| 3367 | } |
| 3368 | |
| 3369 | // Add a DT_RPATH entry if needed. |
| 3370 | const General_options::Dir_list& rpath(parameters->options().rpath()); |
| 3371 | if (!rpath.empty()) |
| 3372 | { |
| 3373 | std::string rpath_val; |
| 3374 | for (General_options::Dir_list::const_iterator p = rpath.begin(); |
| 3375 | p != rpath.end(); |
| 3376 | ++p) |
| 3377 | { |
| 3378 | if (rpath_val.empty()) |
| 3379 | rpath_val = p->name(); |
| 3380 | else |
| 3381 | { |
| 3382 | // Eliminate duplicates. |
| 3383 | General_options::Dir_list::const_iterator q; |
| 3384 | for (q = rpath.begin(); q != p; ++q) |
| 3385 | if (q->name() == p->name()) |
| 3386 | break; |
| 3387 | if (q == p) |
| 3388 | { |
| 3389 | rpath_val += ':'; |
| 3390 | rpath_val += p->name(); |
| 3391 | } |
| 3392 | } |
| 3393 | } |
| 3394 | |
| 3395 | odyn->add_string(elfcpp::DT_RPATH, rpath_val); |
| 3396 | if (parameters->options().enable_new_dtags()) |
| 3397 | odyn->add_string(elfcpp::DT_RUNPATH, rpath_val); |
| 3398 | } |
| 3399 | |
| 3400 | // Look for text segments that have dynamic relocations. |
| 3401 | bool have_textrel = false; |
| 3402 | if (!this->script_options_->saw_sections_clause()) |
| 3403 | { |
| 3404 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
| 3405 | p != this->segment_list_.end(); |
| 3406 | ++p) |
| 3407 | { |
| 3408 | if (((*p)->flags() & elfcpp::PF_W) == 0 |
| 3409 | && (*p)->dynamic_reloc_count() > 0) |
| 3410 | { |
| 3411 | have_textrel = true; |
| 3412 | break; |
| 3413 | } |
| 3414 | } |
| 3415 | } |
| 3416 | else |
| 3417 | { |
| 3418 | // We don't know the section -> segment mapping, so we are |
| 3419 | // conservative and just look for readonly sections with |
| 3420 | // relocations. If those sections wind up in writable segments, |
| 3421 | // then we have created an unnecessary DT_TEXTREL entry. |
| 3422 | for (Section_list::const_iterator p = this->section_list_.begin(); |
| 3423 | p != this->section_list_.end(); |
| 3424 | ++p) |
| 3425 | { |
| 3426 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0 |
| 3427 | && ((*p)->flags() & elfcpp::SHF_WRITE) == 0 |
| 3428 | && ((*p)->dynamic_reloc_count() > 0)) |
| 3429 | { |
| 3430 | have_textrel = true; |
| 3431 | break; |
| 3432 | } |
| 3433 | } |
| 3434 | } |
| 3435 | |
| 3436 | // Add a DT_FLAGS entry. We add it even if no flags are set so that |
| 3437 | // post-link tools can easily modify these flags if desired. |
| 3438 | unsigned int flags = 0; |
| 3439 | if (have_textrel) |
| 3440 | { |
| 3441 | // Add a DT_TEXTREL for compatibility with older loaders. |
| 3442 | odyn->add_constant(elfcpp::DT_TEXTREL, 0); |
| 3443 | flags |= elfcpp::DF_TEXTREL; |
| 3444 | |
| 3445 | if (parameters->options().text()) |
| 3446 | gold_error(_("read-only segment has dynamic relocations")); |
| 3447 | else if (parameters->options().warn_shared_textrel() |
| 3448 | && parameters->options().shared()) |
| 3449 | gold_warning(_("shared library text segment is not shareable")); |
| 3450 | } |
| 3451 | if (parameters->options().shared() && this->has_static_tls()) |
| 3452 | flags |= elfcpp::DF_STATIC_TLS; |
| 3453 | if (parameters->options().origin()) |
| 3454 | flags |= elfcpp::DF_ORIGIN; |
| 3455 | if (parameters->options().Bsymbolic()) |
| 3456 | { |
| 3457 | flags |= elfcpp::DF_SYMBOLIC; |
| 3458 | // Add DT_SYMBOLIC for compatibility with older loaders. |
| 3459 | odyn->add_constant(elfcpp::DT_SYMBOLIC, 0); |
| 3460 | } |
| 3461 | if (parameters->options().now()) |
| 3462 | flags |= elfcpp::DF_BIND_NOW; |
| 3463 | odyn->add_constant(elfcpp::DT_FLAGS, flags); |
| 3464 | |
| 3465 | flags = 0; |
| 3466 | if (parameters->options().initfirst()) |
| 3467 | flags |= elfcpp::DF_1_INITFIRST; |
| 3468 | if (parameters->options().interpose()) |
| 3469 | flags |= elfcpp::DF_1_INTERPOSE; |
| 3470 | if (parameters->options().loadfltr()) |
| 3471 | flags |= elfcpp::DF_1_LOADFLTR; |
| 3472 | if (parameters->options().nodefaultlib()) |
| 3473 | flags |= elfcpp::DF_1_NODEFLIB; |
| 3474 | if (parameters->options().nodelete()) |
| 3475 | flags |= elfcpp::DF_1_NODELETE; |
| 3476 | if (parameters->options().nodlopen()) |
| 3477 | flags |= elfcpp::DF_1_NOOPEN; |
| 3478 | if (parameters->options().nodump()) |
| 3479 | flags |= elfcpp::DF_1_NODUMP; |
| 3480 | if (!parameters->options().shared()) |
| 3481 | flags &= ~(elfcpp::DF_1_INITFIRST |
| 3482 | | elfcpp::DF_1_NODELETE |
| 3483 | | elfcpp::DF_1_NOOPEN); |
| 3484 | if (parameters->options().origin()) |
| 3485 | flags |= elfcpp::DF_1_ORIGIN; |
| 3486 | if (parameters->options().now()) |
| 3487 | flags |= elfcpp::DF_1_NOW; |
| 3488 | if (flags) |
| 3489 | odyn->add_constant(elfcpp::DT_FLAGS_1, flags); |
| 3490 | } |
| 3491 | |
| 3492 | // Set the size of the _DYNAMIC symbol table to be the size of the |
| 3493 | // dynamic data. |
| 3494 | |
| 3495 | void |
| 3496 | Layout::set_dynamic_symbol_size(const Symbol_table* symtab) |
| 3497 | { |
| 3498 | Output_data_dynamic* const odyn = this->dynamic_data_; |
| 3499 | odyn->finalize_data_size(); |
| 3500 | off_t data_size = odyn->data_size(); |
| 3501 | const int size = parameters->target().get_size(); |
| 3502 | if (size == 32) |
| 3503 | symtab->get_sized_symbol<32>(this->dynamic_symbol_)->set_symsize(data_size); |
| 3504 | else if (size == 64) |
| 3505 | symtab->get_sized_symbol<64>(this->dynamic_symbol_)->set_symsize(data_size); |
| 3506 | else |
| 3507 | gold_unreachable(); |
| 3508 | } |
| 3509 | |
| 3510 | // The mapping of input section name prefixes to output section names. |
| 3511 | // In some cases one prefix is itself a prefix of another prefix; in |
| 3512 | // such a case the longer prefix must come first. These prefixes are |
| 3513 | // based on the GNU linker default ELF linker script. |
| 3514 | |
| 3515 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
| 3516 | const Layout::Section_name_mapping Layout::section_name_mapping[] = |
| 3517 | { |
| 3518 | MAPPING_INIT(".text.", ".text"), |
| 3519 | MAPPING_INIT(".ctors.", ".ctors"), |
| 3520 | MAPPING_INIT(".dtors.", ".dtors"), |
| 3521 | MAPPING_INIT(".rodata.", ".rodata"), |
| 3522 | MAPPING_INIT(".data.rel.ro.local", ".data.rel.ro.local"), |
| 3523 | MAPPING_INIT(".data.rel.ro", ".data.rel.ro"), |
| 3524 | MAPPING_INIT(".data.", ".data"), |
| 3525 | MAPPING_INIT(".bss.", ".bss"), |
| 3526 | MAPPING_INIT(".tdata.", ".tdata"), |
| 3527 | MAPPING_INIT(".tbss.", ".tbss"), |
| 3528 | MAPPING_INIT(".init_array.", ".init_array"), |
| 3529 | MAPPING_INIT(".fini_array.", ".fini_array"), |
| 3530 | MAPPING_INIT(".sdata.", ".sdata"), |
| 3531 | MAPPING_INIT(".sbss.", ".sbss"), |
| 3532 | // FIXME: In the GNU linker, .sbss2 and .sdata2 are handled |
| 3533 | // differently depending on whether it is creating a shared library. |
| 3534 | MAPPING_INIT(".sdata2.", ".sdata"), |
| 3535 | MAPPING_INIT(".sbss2.", ".sbss"), |
| 3536 | MAPPING_INIT(".lrodata.", ".lrodata"), |
| 3537 | MAPPING_INIT(".ldata.", ".ldata"), |
| 3538 | MAPPING_INIT(".lbss.", ".lbss"), |
| 3539 | MAPPING_INIT(".gcc_except_table.", ".gcc_except_table"), |
| 3540 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.local.", ".data.rel.ro.local"), |
| 3541 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.", ".data.rel.ro"), |
| 3542 | MAPPING_INIT(".gnu.linkonce.t.", ".text"), |
| 3543 | MAPPING_INIT(".gnu.linkonce.r.", ".rodata"), |
| 3544 | MAPPING_INIT(".gnu.linkonce.d.", ".data"), |
| 3545 | MAPPING_INIT(".gnu.linkonce.b.", ".bss"), |
| 3546 | MAPPING_INIT(".gnu.linkonce.s.", ".sdata"), |
| 3547 | MAPPING_INIT(".gnu.linkonce.sb.", ".sbss"), |
| 3548 | MAPPING_INIT(".gnu.linkonce.s2.", ".sdata"), |
| 3549 | MAPPING_INIT(".gnu.linkonce.sb2.", ".sbss"), |
| 3550 | MAPPING_INIT(".gnu.linkonce.wi.", ".debug_info"), |
| 3551 | MAPPING_INIT(".gnu.linkonce.td.", ".tdata"), |
| 3552 | MAPPING_INIT(".gnu.linkonce.tb.", ".tbss"), |
| 3553 | MAPPING_INIT(".gnu.linkonce.lr.", ".lrodata"), |
| 3554 | MAPPING_INIT(".gnu.linkonce.l.", ".ldata"), |
| 3555 | MAPPING_INIT(".gnu.linkonce.lb.", ".lbss"), |
| 3556 | MAPPING_INIT(".ARM.extab.", ".ARM.extab"), |
| 3557 | MAPPING_INIT(".gnu.linkonce.armextab.", ".ARM.extab"), |
| 3558 | MAPPING_INIT(".ARM.exidx.", ".ARM.exidx"), |
| 3559 | MAPPING_INIT(".gnu.linkonce.armexidx.", ".ARM.exidx"), |
| 3560 | }; |
| 3561 | #undef MAPPING_INIT |
| 3562 | |
| 3563 | const int Layout::section_name_mapping_count = |
| 3564 | (sizeof(Layout::section_name_mapping) |
| 3565 | / sizeof(Layout::section_name_mapping[0])); |
| 3566 | |
| 3567 | // Choose the output section name to use given an input section name. |
| 3568 | // Set *PLEN to the length of the name. *PLEN is initialized to the |
| 3569 | // length of NAME. |
| 3570 | |
| 3571 | const char* |
| 3572 | Layout::output_section_name(const char* name, size_t* plen) |
| 3573 | { |
| 3574 | // gcc 4.3 generates the following sorts of section names when it |
| 3575 | // needs a section name specific to a function: |
| 3576 | // .text.FN |
| 3577 | // .rodata.FN |
| 3578 | // .sdata2.FN |
| 3579 | // .data.FN |
| 3580 | // .data.rel.FN |
| 3581 | // .data.rel.local.FN |
| 3582 | // .data.rel.ro.FN |
| 3583 | // .data.rel.ro.local.FN |
| 3584 | // .sdata.FN |
| 3585 | // .bss.FN |
| 3586 | // .sbss.FN |
| 3587 | // .tdata.FN |
| 3588 | // .tbss.FN |
| 3589 | |
| 3590 | // The GNU linker maps all of those to the part before the .FN, |
| 3591 | // except that .data.rel.local.FN is mapped to .data, and |
| 3592 | // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections |
| 3593 | // beginning with .data.rel.ro.local are grouped together. |
| 3594 | |
| 3595 | // For an anonymous namespace, the string FN can contain a '.'. |
| 3596 | |
| 3597 | // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the |
| 3598 | // GNU linker maps to .rodata. |
| 3599 | |
| 3600 | // The .data.rel.ro sections are used with -z relro. The sections |
| 3601 | // are recognized by name. We use the same names that the GNU |
| 3602 | // linker does for these sections. |
| 3603 | |
| 3604 | // It is hard to handle this in a principled way, so we don't even |
| 3605 | // try. We use a table of mappings. If the input section name is |
| 3606 | // not found in the table, we simply use it as the output section |
| 3607 | // name. |
| 3608 | |
| 3609 | const Section_name_mapping* psnm = section_name_mapping; |
| 3610 | for (int i = 0; i < section_name_mapping_count; ++i, ++psnm) |
| 3611 | { |
| 3612 | if (strncmp(name, psnm->from, psnm->fromlen) == 0) |
| 3613 | { |
| 3614 | *plen = psnm->tolen; |
| 3615 | return psnm->to; |
| 3616 | } |
| 3617 | } |
| 3618 | |
| 3619 | return name; |
| 3620 | } |
| 3621 | |
| 3622 | // Check if a comdat group or .gnu.linkonce section with the given |
| 3623 | // NAME is selected for the link. If there is already a section, |
| 3624 | // *KEPT_SECTION is set to point to the existing section and the |
| 3625 | // function returns false. Otherwise, OBJECT, SHNDX, IS_COMDAT, and |
| 3626 | // IS_GROUP_NAME are recorded for this NAME in the layout object, |
| 3627 | // *KEPT_SECTION is set to the internal copy and the function returns |
| 3628 | // true. |
| 3629 | |
| 3630 | bool |
| 3631 | Layout::find_or_add_kept_section(const std::string& name, |
| 3632 | Relobj* object, |
| 3633 | unsigned int shndx, |
| 3634 | bool is_comdat, |
| 3635 | bool is_group_name, |
| 3636 | Kept_section** kept_section) |
| 3637 | { |
| 3638 | // It's normal to see a couple of entries here, for the x86 thunk |
| 3639 | // sections. If we see more than a few, we're linking a C++ |
| 3640 | // program, and we resize to get more space to minimize rehashing. |
| 3641 | if (this->signatures_.size() > 4 |
| 3642 | && !this->resized_signatures_) |
| 3643 | { |
| 3644 | reserve_unordered_map(&this->signatures_, |
| 3645 | this->number_of_input_files_ * 64); |
| 3646 | this->resized_signatures_ = true; |
| 3647 | } |
| 3648 | |
| 3649 | Kept_section candidate; |
| 3650 | std::pair<Signatures::iterator, bool> ins = |
| 3651 | this->signatures_.insert(std::make_pair(name, candidate)); |
| 3652 | |
| 3653 | if (kept_section != NULL) |
| 3654 | *kept_section = &ins.first->second; |
| 3655 | if (ins.second) |
| 3656 | { |
| 3657 | // This is the first time we've seen this signature. |
| 3658 | ins.first->second.set_object(object); |
| 3659 | ins.first->second.set_shndx(shndx); |
| 3660 | if (is_comdat) |
| 3661 | ins.first->second.set_is_comdat(); |
| 3662 | if (is_group_name) |
| 3663 | ins.first->second.set_is_group_name(); |
| 3664 | return true; |
| 3665 | } |
| 3666 | |
| 3667 | // We have already seen this signature. |
| 3668 | |
| 3669 | if (ins.first->second.is_group_name()) |
| 3670 | { |
| 3671 | // We've already seen a real section group with this signature. |
| 3672 | // If the kept group is from a plugin object, and we're in the |
| 3673 | // replacement phase, accept the new one as a replacement. |
| 3674 | if (ins.first->second.object() == NULL |
| 3675 | && parameters->options().plugins()->in_replacement_phase()) |
| 3676 | { |
| 3677 | ins.first->second.set_object(object); |
| 3678 | ins.first->second.set_shndx(shndx); |
| 3679 | return true; |
| 3680 | } |
| 3681 | return false; |
| 3682 | } |
| 3683 | else if (is_group_name) |
| 3684 | { |
| 3685 | // This is a real section group, and we've already seen a |
| 3686 | // linkonce section with this signature. Record that we've seen |
| 3687 | // a section group, and don't include this section group. |
| 3688 | ins.first->second.set_is_group_name(); |
| 3689 | return false; |
| 3690 | } |
| 3691 | else |
| 3692 | { |
| 3693 | // We've already seen a linkonce section and this is a linkonce |
| 3694 | // section. These don't block each other--this may be the same |
| 3695 | // symbol name with different section types. |
| 3696 | return true; |
| 3697 | } |
| 3698 | } |
| 3699 | |
| 3700 | // Store the allocated sections into the section list. |
| 3701 | |
| 3702 | void |
| 3703 | Layout::get_allocated_sections(Section_list* section_list) const |
| 3704 | { |
| 3705 | for (Section_list::const_iterator p = this->section_list_.begin(); |
| 3706 | p != this->section_list_.end(); |
| 3707 | ++p) |
| 3708 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0) |
| 3709 | section_list->push_back(*p); |
| 3710 | } |
| 3711 | |
| 3712 | // Create an output segment. |
| 3713 | |
| 3714 | Output_segment* |
| 3715 | Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) |
| 3716 | { |
| 3717 | gold_assert(!parameters->options().relocatable()); |
| 3718 | Output_segment* oseg = new Output_segment(type, flags); |
| 3719 | this->segment_list_.push_back(oseg); |
| 3720 | |
| 3721 | if (type == elfcpp::PT_TLS) |
| 3722 | this->tls_segment_ = oseg; |
| 3723 | else if (type == elfcpp::PT_GNU_RELRO) |
| 3724 | this->relro_segment_ = oseg; |
| 3725 | |
| 3726 | return oseg; |
| 3727 | } |
| 3728 | |
| 3729 | // Write out the Output_sections. Most won't have anything to write, |
| 3730 | // since most of the data will come from input sections which are |
| 3731 | // handled elsewhere. But some Output_sections do have Output_data. |
| 3732 | |
| 3733 | void |
| 3734 | Layout::write_output_sections(Output_file* of) const |
| 3735 | { |
| 3736 | for (Section_list::const_iterator p = this->section_list_.begin(); |
| 3737 | p != this->section_list_.end(); |
| 3738 | ++p) |
| 3739 | { |
| 3740 | if (!(*p)->after_input_sections()) |
| 3741 | (*p)->write(of); |
| 3742 | } |
| 3743 | } |
| 3744 | |
| 3745 | // Write out data not associated with a section or the symbol table. |
| 3746 | |
| 3747 | void |
| 3748 | Layout::write_data(const Symbol_table* symtab, Output_file* of) const |
| 3749 | { |
| 3750 | if (!parameters->options().strip_all()) |
| 3751 | { |
| 3752 | const Output_section* symtab_section = this->symtab_section_; |
| 3753 | for (Section_list::const_iterator p = this->section_list_.begin(); |
| 3754 | p != this->section_list_.end(); |
| 3755 | ++p) |
| 3756 | { |
| 3757 | if ((*p)->needs_symtab_index()) |
| 3758 | { |
| 3759 | gold_assert(symtab_section != NULL); |
| 3760 | unsigned int index = (*p)->symtab_index(); |
| 3761 | gold_assert(index > 0 && index != -1U); |
| 3762 | off_t off = (symtab_section->offset() |
| 3763 | + index * symtab_section->entsize()); |
| 3764 | symtab->write_section_symbol(*p, this->symtab_xindex_, of, off); |
| 3765 | } |
| 3766 | } |
| 3767 | } |
| 3768 | |
| 3769 | const Output_section* dynsym_section = this->dynsym_section_; |
| 3770 | for (Section_list::const_iterator p = this->section_list_.begin(); |
| 3771 | p != this->section_list_.end(); |
| 3772 | ++p) |
| 3773 | { |
| 3774 | if ((*p)->needs_dynsym_index()) |
| 3775 | { |
| 3776 | gold_assert(dynsym_section != NULL); |
| 3777 | unsigned int index = (*p)->dynsym_index(); |
| 3778 | gold_assert(index > 0 && index != -1U); |
| 3779 | off_t off = (dynsym_section->offset() |
| 3780 | + index * dynsym_section->entsize()); |
| 3781 | symtab->write_section_symbol(*p, this->dynsym_xindex_, of, off); |
| 3782 | } |
| 3783 | } |
| 3784 | |
| 3785 | // Write out the Output_data which are not in an Output_section. |
| 3786 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
| 3787 | p != this->special_output_list_.end(); |
| 3788 | ++p) |
| 3789 | (*p)->write(of); |
| 3790 | } |
| 3791 | |
| 3792 | // Write out the Output_sections which can only be written after the |
| 3793 | // input sections are complete. |
| 3794 | |
| 3795 | void |
| 3796 | Layout::write_sections_after_input_sections(Output_file* of) |
| 3797 | { |
| 3798 | // Determine the final section offsets, and thus the final output |
| 3799 | // file size. Note we finalize the .shstrab last, to allow the |
| 3800 | // after_input_section sections to modify their section-names before |
| 3801 | // writing. |
| 3802 | if (this->any_postprocessing_sections_) |
| 3803 | { |
| 3804 | off_t off = this->output_file_size_; |
| 3805 | off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS); |
| 3806 | |
| 3807 | // Now that we've finalized the names, we can finalize the shstrab. |
| 3808 | off = |
| 3809 | this->set_section_offsets(off, |
| 3810 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); |
| 3811 | |
| 3812 | if (off > this->output_file_size_) |
| 3813 | { |
| 3814 | of->resize(off); |
| 3815 | this->output_file_size_ = off; |
| 3816 | } |
| 3817 | } |
| 3818 | |
| 3819 | for (Section_list::const_iterator p = this->section_list_.begin(); |
| 3820 | p != this->section_list_.end(); |
| 3821 | ++p) |
| 3822 | { |
| 3823 | if ((*p)->after_input_sections()) |
| 3824 | (*p)->write(of); |
| 3825 | } |
| 3826 | |
| 3827 | this->section_headers_->write(of); |
| 3828 | } |
| 3829 | |
| 3830 | // If the build ID requires computing a checksum, do so here, and |
| 3831 | // write it out. We compute a checksum over the entire file because |
| 3832 | // that is simplest. |
| 3833 | |
| 3834 | void |
| 3835 | Layout::write_build_id(Output_file* of) const |
| 3836 | { |
| 3837 | if (this->build_id_note_ == NULL) |
| 3838 | return; |
| 3839 | |
| 3840 | const unsigned char* iv = of->get_input_view(0, this->output_file_size_); |
| 3841 | |
| 3842 | unsigned char* ov = of->get_output_view(this->build_id_note_->offset(), |
| 3843 | this->build_id_note_->data_size()); |
| 3844 | |
| 3845 | const char* style = parameters->options().build_id(); |
| 3846 | if (strcmp(style, "sha1") == 0) |
| 3847 | { |
| 3848 | sha1_ctx ctx; |
| 3849 | sha1_init_ctx(&ctx); |
| 3850 | sha1_process_bytes(iv, this->output_file_size_, &ctx); |
| 3851 | sha1_finish_ctx(&ctx, ov); |
| 3852 | } |
| 3853 | else if (strcmp(style, "md5") == 0) |
| 3854 | { |
| 3855 | md5_ctx ctx; |
| 3856 | md5_init_ctx(&ctx); |
| 3857 | md5_process_bytes(iv, this->output_file_size_, &ctx); |
| 3858 | md5_finish_ctx(&ctx, ov); |
| 3859 | } |
| 3860 | else |
| 3861 | gold_unreachable(); |
| 3862 | |
| 3863 | of->write_output_view(this->build_id_note_->offset(), |
| 3864 | this->build_id_note_->data_size(), |
| 3865 | ov); |
| 3866 | |
| 3867 | of->free_input_view(0, this->output_file_size_, iv); |
| 3868 | } |
| 3869 | |
| 3870 | // Write out a binary file. This is called after the link is |
| 3871 | // complete. IN is the temporary output file we used to generate the |
| 3872 | // ELF code. We simply walk through the segments, read them from |
| 3873 | // their file offset in IN, and write them to their load address in |
| 3874 | // the output file. FIXME: with a bit more work, we could support |
| 3875 | // S-records and/or Intel hex format here. |
| 3876 | |
| 3877 | void |
| 3878 | Layout::write_binary(Output_file* in) const |
| 3879 | { |
| 3880 | gold_assert(parameters->options().oformat_enum() |
| 3881 | == General_options::OBJECT_FORMAT_BINARY); |
| 3882 | |
| 3883 | // Get the size of the binary file. |
| 3884 | uint64_t max_load_address = 0; |
| 3885 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
| 3886 | p != this->segment_list_.end(); |
| 3887 | ++p) |
| 3888 | { |
| 3889 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) |
| 3890 | { |
| 3891 | uint64_t max_paddr = (*p)->paddr() + (*p)->filesz(); |
| 3892 | if (max_paddr > max_load_address) |
| 3893 | max_load_address = max_paddr; |
| 3894 | } |
| 3895 | } |
| 3896 | |
| 3897 | Output_file out(parameters->options().output_file_name()); |
| 3898 | out.open(max_load_address); |
| 3899 | |
| 3900 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
| 3901 | p != this->segment_list_.end(); |
| 3902 | ++p) |
| 3903 | { |
| 3904 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) |
| 3905 | { |
| 3906 | const unsigned char* vin = in->get_input_view((*p)->offset(), |
| 3907 | (*p)->filesz()); |
| 3908 | unsigned char* vout = out.get_output_view((*p)->paddr(), |
| 3909 | (*p)->filesz()); |
| 3910 | memcpy(vout, vin, (*p)->filesz()); |
| 3911 | out.write_output_view((*p)->paddr(), (*p)->filesz(), vout); |
| 3912 | in->free_input_view((*p)->offset(), (*p)->filesz(), vin); |
| 3913 | } |
| 3914 | } |
| 3915 | |
| 3916 | out.close(); |
| 3917 | } |
| 3918 | |
| 3919 | // Print the output sections to the map file. |
| 3920 | |
| 3921 | void |
| 3922 | Layout::print_to_mapfile(Mapfile* mapfile) const |
| 3923 | { |
| 3924 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
| 3925 | p != this->segment_list_.end(); |
| 3926 | ++p) |
| 3927 | (*p)->print_sections_to_mapfile(mapfile); |
| 3928 | } |
| 3929 | |
| 3930 | // Print statistical information to stderr. This is used for --stats. |
| 3931 | |
| 3932 | void |
| 3933 | Layout::print_stats() const |
| 3934 | { |
| 3935 | this->namepool_.print_stats("section name pool"); |
| 3936 | this->sympool_.print_stats("output symbol name pool"); |
| 3937 | this->dynpool_.print_stats("dynamic name pool"); |
| 3938 | |
| 3939 | for (Section_list::const_iterator p = this->section_list_.begin(); |
| 3940 | p != this->section_list_.end(); |
| 3941 | ++p) |
| 3942 | (*p)->print_merge_stats(); |
| 3943 | } |
| 3944 | |
| 3945 | // Write_sections_task methods. |
| 3946 | |
| 3947 | // We can always run this task. |
| 3948 | |
| 3949 | Task_token* |
| 3950 | Write_sections_task::is_runnable() |
| 3951 | { |
| 3952 | return NULL; |
| 3953 | } |
| 3954 | |
| 3955 | // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER |
| 3956 | // when finished. |
| 3957 | |
| 3958 | void |
| 3959 | Write_sections_task::locks(Task_locker* tl) |
| 3960 | { |
| 3961 | tl->add(this, this->output_sections_blocker_); |
| 3962 | tl->add(this, this->final_blocker_); |
| 3963 | } |
| 3964 | |
| 3965 | // Run the task--write out the data. |
| 3966 | |
| 3967 | void |
| 3968 | Write_sections_task::run(Workqueue*) |
| 3969 | { |
| 3970 | this->layout_->write_output_sections(this->of_); |
| 3971 | } |
| 3972 | |
| 3973 | // Write_data_task methods. |
| 3974 | |
| 3975 | // We can always run this task. |
| 3976 | |
| 3977 | Task_token* |
| 3978 | Write_data_task::is_runnable() |
| 3979 | { |
| 3980 | return NULL; |
| 3981 | } |
| 3982 | |
| 3983 | // We need to unlock FINAL_BLOCKER when finished. |
| 3984 | |
| 3985 | void |
| 3986 | Write_data_task::locks(Task_locker* tl) |
| 3987 | { |
| 3988 | tl->add(this, this->final_blocker_); |
| 3989 | } |
| 3990 | |
| 3991 | // Run the task--write out the data. |
| 3992 | |
| 3993 | void |
| 3994 | Write_data_task::run(Workqueue*) |
| 3995 | { |
| 3996 | this->layout_->write_data(this->symtab_, this->of_); |
| 3997 | } |
| 3998 | |
| 3999 | // Write_symbols_task methods. |
| 4000 | |
| 4001 | // We can always run this task. |
| 4002 | |
| 4003 | Task_token* |
| 4004 | Write_symbols_task::is_runnable() |
| 4005 | { |
| 4006 | return NULL; |
| 4007 | } |
| 4008 | |
| 4009 | // We need to unlock FINAL_BLOCKER when finished. |
| 4010 | |
| 4011 | void |
| 4012 | Write_symbols_task::locks(Task_locker* tl) |
| 4013 | { |
| 4014 | tl->add(this, this->final_blocker_); |
| 4015 | } |
| 4016 | |
| 4017 | // Run the task--write out the symbols. |
| 4018 | |
| 4019 | void |
| 4020 | Write_symbols_task::run(Workqueue*) |
| 4021 | { |
| 4022 | this->symtab_->write_globals(this->sympool_, this->dynpool_, |
| 4023 | this->layout_->symtab_xindex(), |
| 4024 | this->layout_->dynsym_xindex(), this->of_); |
| 4025 | } |
| 4026 | |
| 4027 | // Write_after_input_sections_task methods. |
| 4028 | |
| 4029 | // We can only run this task after the input sections have completed. |
| 4030 | |
| 4031 | Task_token* |
| 4032 | Write_after_input_sections_task::is_runnable() |
| 4033 | { |
| 4034 | if (this->input_sections_blocker_->is_blocked()) |
| 4035 | return this->input_sections_blocker_; |
| 4036 | return NULL; |
| 4037 | } |
| 4038 | |
| 4039 | // We need to unlock FINAL_BLOCKER when finished. |
| 4040 | |
| 4041 | void |
| 4042 | Write_after_input_sections_task::locks(Task_locker* tl) |
| 4043 | { |
| 4044 | tl->add(this, this->final_blocker_); |
| 4045 | } |
| 4046 | |
| 4047 | // Run the task. |
| 4048 | |
| 4049 | void |
| 4050 | Write_after_input_sections_task::run(Workqueue*) |
| 4051 | { |
| 4052 | this->layout_->write_sections_after_input_sections(this->of_); |
| 4053 | } |
| 4054 | |
| 4055 | // Close_task_runner methods. |
| 4056 | |
| 4057 | // Run the task--close the file. |
| 4058 | |
| 4059 | void |
| 4060 | Close_task_runner::run(Workqueue*, const Task*) |
| 4061 | { |
| 4062 | // If we need to compute a checksum for the BUILD if, we do so here. |
| 4063 | this->layout_->write_build_id(this->of_); |
| 4064 | |
| 4065 | // If we've been asked to create a binary file, we do so here. |
| 4066 | if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
| 4067 | this->layout_->write_binary(this->of_); |
| 4068 | |
| 4069 | this->of_->close(); |
| 4070 | } |
| 4071 | |
| 4072 | // Instantiate the templates we need. We could use the configure |
| 4073 | // script to restrict this to only the ones for implemented targets. |
| 4074 | |
| 4075 | #ifdef HAVE_TARGET_32_LITTLE |
| 4076 | template |
| 4077 | Output_section* |
| 4078 | Layout::layout<32, false>(Sized_relobj<32, false>* object, unsigned int shndx, |
| 4079 | const char* name, |
| 4080 | const elfcpp::Shdr<32, false>& shdr, |
| 4081 | unsigned int, unsigned int, off_t*); |
| 4082 | #endif |
| 4083 | |
| 4084 | #ifdef HAVE_TARGET_32_BIG |
| 4085 | template |
| 4086 | Output_section* |
| 4087 | Layout::layout<32, true>(Sized_relobj<32, true>* object, unsigned int shndx, |
| 4088 | const char* name, |
| 4089 | const elfcpp::Shdr<32, true>& shdr, |
| 4090 | unsigned int, unsigned int, off_t*); |
| 4091 | #endif |
| 4092 | |
| 4093 | #ifdef HAVE_TARGET_64_LITTLE |
| 4094 | template |
| 4095 | Output_section* |
| 4096 | Layout::layout<64, false>(Sized_relobj<64, false>* object, unsigned int shndx, |
| 4097 | const char* name, |
| 4098 | const elfcpp::Shdr<64, false>& shdr, |
| 4099 | unsigned int, unsigned int, off_t*); |
| 4100 | #endif |
| 4101 | |
| 4102 | #ifdef HAVE_TARGET_64_BIG |
| 4103 | template |
| 4104 | Output_section* |
| 4105 | Layout::layout<64, true>(Sized_relobj<64, true>* object, unsigned int shndx, |
| 4106 | const char* name, |
| 4107 | const elfcpp::Shdr<64, true>& shdr, |
| 4108 | unsigned int, unsigned int, off_t*); |
| 4109 | #endif |
| 4110 | |
| 4111 | #ifdef HAVE_TARGET_32_LITTLE |
| 4112 | template |
| 4113 | Output_section* |
| 4114 | Layout::layout_reloc<32, false>(Sized_relobj<32, false>* object, |
| 4115 | unsigned int reloc_shndx, |
| 4116 | const elfcpp::Shdr<32, false>& shdr, |
| 4117 | Output_section* data_section, |
| 4118 | Relocatable_relocs* rr); |
| 4119 | #endif |
| 4120 | |
| 4121 | #ifdef HAVE_TARGET_32_BIG |
| 4122 | template |
| 4123 | Output_section* |
| 4124 | Layout::layout_reloc<32, true>(Sized_relobj<32, true>* object, |
| 4125 | unsigned int reloc_shndx, |
| 4126 | const elfcpp::Shdr<32, true>& shdr, |
| 4127 | Output_section* data_section, |
| 4128 | Relocatable_relocs* rr); |
| 4129 | #endif |
| 4130 | |
| 4131 | #ifdef HAVE_TARGET_64_LITTLE |
| 4132 | template |
| 4133 | Output_section* |
| 4134 | Layout::layout_reloc<64, false>(Sized_relobj<64, false>* object, |
| 4135 | unsigned int reloc_shndx, |
| 4136 | const elfcpp::Shdr<64, false>& shdr, |
| 4137 | Output_section* data_section, |
| 4138 | Relocatable_relocs* rr); |
| 4139 | #endif |
| 4140 | |
| 4141 | #ifdef HAVE_TARGET_64_BIG |
| 4142 | template |
| 4143 | Output_section* |
| 4144 | Layout::layout_reloc<64, true>(Sized_relobj<64, true>* object, |
| 4145 | unsigned int reloc_shndx, |
| 4146 | const elfcpp::Shdr<64, true>& shdr, |
| 4147 | Output_section* data_section, |
| 4148 | Relocatable_relocs* rr); |
| 4149 | #endif |
| 4150 | |
| 4151 | #ifdef HAVE_TARGET_32_LITTLE |
| 4152 | template |
| 4153 | void |
| 4154 | Layout::layout_group<32, false>(Symbol_table* symtab, |
| 4155 | Sized_relobj<32, false>* object, |
| 4156 | unsigned int, |
| 4157 | const char* group_section_name, |
| 4158 | const char* signature, |
| 4159 | const elfcpp::Shdr<32, false>& shdr, |
| 4160 | elfcpp::Elf_Word flags, |
| 4161 | std::vector<unsigned int>* shndxes); |
| 4162 | #endif |
| 4163 | |
| 4164 | #ifdef HAVE_TARGET_32_BIG |
| 4165 | template |
| 4166 | void |
| 4167 | Layout::layout_group<32, true>(Symbol_table* symtab, |
| 4168 | Sized_relobj<32, true>* object, |
| 4169 | unsigned int, |
| 4170 | const char* group_section_name, |
| 4171 | const char* signature, |
| 4172 | const elfcpp::Shdr<32, true>& shdr, |
| 4173 | elfcpp::Elf_Word flags, |
| 4174 | std::vector<unsigned int>* shndxes); |
| 4175 | #endif |
| 4176 | |
| 4177 | #ifdef HAVE_TARGET_64_LITTLE |
| 4178 | template |
| 4179 | void |
| 4180 | Layout::layout_group<64, false>(Symbol_table* symtab, |
| 4181 | Sized_relobj<64, false>* object, |
| 4182 | unsigned int, |
| 4183 | const char* group_section_name, |
| 4184 | const char* signature, |
| 4185 | const elfcpp::Shdr<64, false>& shdr, |
| 4186 | elfcpp::Elf_Word flags, |
| 4187 | std::vector<unsigned int>* shndxes); |
| 4188 | #endif |
| 4189 | |
| 4190 | #ifdef HAVE_TARGET_64_BIG |
| 4191 | template |
| 4192 | void |
| 4193 | Layout::layout_group<64, true>(Symbol_table* symtab, |
| 4194 | Sized_relobj<64, true>* object, |
| 4195 | unsigned int, |
| 4196 | const char* group_section_name, |
| 4197 | const char* signature, |
| 4198 | const elfcpp::Shdr<64, true>& shdr, |
| 4199 | elfcpp::Elf_Word flags, |
| 4200 | std::vector<unsigned int>* shndxes); |
| 4201 | #endif |
| 4202 | |
| 4203 | #ifdef HAVE_TARGET_32_LITTLE |
| 4204 | template |
| 4205 | Output_section* |
| 4206 | Layout::layout_eh_frame<32, false>(Sized_relobj<32, false>* object, |
| 4207 | const unsigned char* symbols, |
| 4208 | off_t symbols_size, |
| 4209 | const unsigned char* symbol_names, |
| 4210 | off_t symbol_names_size, |
| 4211 | unsigned int shndx, |
| 4212 | const elfcpp::Shdr<32, false>& shdr, |
| 4213 | unsigned int reloc_shndx, |
| 4214 | unsigned int reloc_type, |
| 4215 | off_t* off); |
| 4216 | #endif |
| 4217 | |
| 4218 | #ifdef HAVE_TARGET_32_BIG |
| 4219 | template |
| 4220 | Output_section* |
| 4221 | Layout::layout_eh_frame<32, true>(Sized_relobj<32, true>* object, |
| 4222 | const unsigned char* symbols, |
| 4223 | off_t symbols_size, |
| 4224 | const unsigned char* symbol_names, |
| 4225 | off_t symbol_names_size, |
| 4226 | unsigned int shndx, |
| 4227 | const elfcpp::Shdr<32, true>& shdr, |
| 4228 | unsigned int reloc_shndx, |
| 4229 | unsigned int reloc_type, |
| 4230 | off_t* off); |
| 4231 | #endif |
| 4232 | |
| 4233 | #ifdef HAVE_TARGET_64_LITTLE |
| 4234 | template |
| 4235 | Output_section* |
| 4236 | Layout::layout_eh_frame<64, false>(Sized_relobj<64, false>* object, |
| 4237 | const unsigned char* symbols, |
| 4238 | off_t symbols_size, |
| 4239 | const unsigned char* symbol_names, |
| 4240 | off_t symbol_names_size, |
| 4241 | unsigned int shndx, |
| 4242 | const elfcpp::Shdr<64, false>& shdr, |
| 4243 | unsigned int reloc_shndx, |
| 4244 | unsigned int reloc_type, |
| 4245 | off_t* off); |
| 4246 | #endif |
| 4247 | |
| 4248 | #ifdef HAVE_TARGET_64_BIG |
| 4249 | template |
| 4250 | Output_section* |
| 4251 | Layout::layout_eh_frame<64, true>(Sized_relobj<64, true>* object, |
| 4252 | const unsigned char* symbols, |
| 4253 | off_t symbols_size, |
| 4254 | const unsigned char* symbol_names, |
| 4255 | off_t symbol_names_size, |
| 4256 | unsigned int shndx, |
| 4257 | const elfcpp::Shdr<64, true>& shdr, |
| 4258 | unsigned int reloc_shndx, |
| 4259 | unsigned int reloc_type, |
| 4260 | off_t* off); |
| 4261 | #endif |
| 4262 | |
| 4263 | } // End namespace gold. |