| 1 | // output.cc -- manage the output file for gold |
| 2 | |
| 3 | // Copyright 2006, 2007, 2008, 2009 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 <cstdlib> |
| 26 | #include <cstring> |
| 27 | #include <cerrno> |
| 28 | #include <fcntl.h> |
| 29 | #include <unistd.h> |
| 30 | #include <sys/mman.h> |
| 31 | #include <sys/stat.h> |
| 32 | #include <algorithm> |
| 33 | #include "libiberty.h" // for unlink_if_ordinary() |
| 34 | |
| 35 | #include "parameters.h" |
| 36 | #include "object.h" |
| 37 | #include "symtab.h" |
| 38 | #include "reloc.h" |
| 39 | #include "merge.h" |
| 40 | #include "descriptors.h" |
| 41 | #include "output.h" |
| 42 | |
| 43 | // Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS |
| 44 | #ifndef MAP_ANONYMOUS |
| 45 | # define MAP_ANONYMOUS MAP_ANON |
| 46 | #endif |
| 47 | |
| 48 | #ifndef HAVE_POSIX_FALLOCATE |
| 49 | // A dummy, non general, version of posix_fallocate. Here we just set |
| 50 | // the file size and hope that there is enough disk space. FIXME: We |
| 51 | // could allocate disk space by walking block by block and writing a |
| 52 | // zero byte into each block. |
| 53 | static int |
| 54 | posix_fallocate(int o, off_t offset, off_t len) |
| 55 | { |
| 56 | return ftruncate(o, offset + len); |
| 57 | } |
| 58 | #endif // !defined(HAVE_POSIX_FALLOCATE) |
| 59 | |
| 60 | namespace gold |
| 61 | { |
| 62 | |
| 63 | // Output_data variables. |
| 64 | |
| 65 | bool Output_data::allocated_sizes_are_fixed; |
| 66 | |
| 67 | // Output_data methods. |
| 68 | |
| 69 | Output_data::~Output_data() |
| 70 | { |
| 71 | } |
| 72 | |
| 73 | // Return the default alignment for the target size. |
| 74 | |
| 75 | uint64_t |
| 76 | Output_data::default_alignment() |
| 77 | { |
| 78 | return Output_data::default_alignment_for_size( |
| 79 | parameters->target().get_size()); |
| 80 | } |
| 81 | |
| 82 | // Return the default alignment for a size--32 or 64. |
| 83 | |
| 84 | uint64_t |
| 85 | Output_data::default_alignment_for_size(int size) |
| 86 | { |
| 87 | if (size == 32) |
| 88 | return 4; |
| 89 | else if (size == 64) |
| 90 | return 8; |
| 91 | else |
| 92 | gold_unreachable(); |
| 93 | } |
| 94 | |
| 95 | // Output_section_header methods. This currently assumes that the |
| 96 | // segment and section lists are complete at construction time. |
| 97 | |
| 98 | Output_section_headers::Output_section_headers( |
| 99 | const Layout* layout, |
| 100 | const Layout::Segment_list* segment_list, |
| 101 | const Layout::Section_list* section_list, |
| 102 | const Layout::Section_list* unattached_section_list, |
| 103 | const Stringpool* secnamepool, |
| 104 | const Output_section* shstrtab_section) |
| 105 | : layout_(layout), |
| 106 | segment_list_(segment_list), |
| 107 | section_list_(section_list), |
| 108 | unattached_section_list_(unattached_section_list), |
| 109 | secnamepool_(secnamepool), |
| 110 | shstrtab_section_(shstrtab_section) |
| 111 | { |
| 112 | // Count all the sections. Start with 1 for the null section. |
| 113 | off_t count = 1; |
| 114 | if (!parameters->options().relocatable()) |
| 115 | { |
| 116 | for (Layout::Segment_list::const_iterator p = segment_list->begin(); |
| 117 | p != segment_list->end(); |
| 118 | ++p) |
| 119 | if ((*p)->type() == elfcpp::PT_LOAD) |
| 120 | count += (*p)->output_section_count(); |
| 121 | } |
| 122 | else |
| 123 | { |
| 124 | for (Layout::Section_list::const_iterator p = section_list->begin(); |
| 125 | p != section_list->end(); |
| 126 | ++p) |
| 127 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0) |
| 128 | ++count; |
| 129 | } |
| 130 | count += unattached_section_list->size(); |
| 131 | |
| 132 | const int size = parameters->target().get_size(); |
| 133 | int shdr_size; |
| 134 | if (size == 32) |
| 135 | shdr_size = elfcpp::Elf_sizes<32>::shdr_size; |
| 136 | else if (size == 64) |
| 137 | shdr_size = elfcpp::Elf_sizes<64>::shdr_size; |
| 138 | else |
| 139 | gold_unreachable(); |
| 140 | |
| 141 | this->set_data_size(count * shdr_size); |
| 142 | } |
| 143 | |
| 144 | // Write out the section headers. |
| 145 | |
| 146 | void |
| 147 | Output_section_headers::do_write(Output_file* of) |
| 148 | { |
| 149 | switch (parameters->size_and_endianness()) |
| 150 | { |
| 151 | #ifdef HAVE_TARGET_32_LITTLE |
| 152 | case Parameters::TARGET_32_LITTLE: |
| 153 | this->do_sized_write<32, false>(of); |
| 154 | break; |
| 155 | #endif |
| 156 | #ifdef HAVE_TARGET_32_BIG |
| 157 | case Parameters::TARGET_32_BIG: |
| 158 | this->do_sized_write<32, true>(of); |
| 159 | break; |
| 160 | #endif |
| 161 | #ifdef HAVE_TARGET_64_LITTLE |
| 162 | case Parameters::TARGET_64_LITTLE: |
| 163 | this->do_sized_write<64, false>(of); |
| 164 | break; |
| 165 | #endif |
| 166 | #ifdef HAVE_TARGET_64_BIG |
| 167 | case Parameters::TARGET_64_BIG: |
| 168 | this->do_sized_write<64, true>(of); |
| 169 | break; |
| 170 | #endif |
| 171 | default: |
| 172 | gold_unreachable(); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | template<int size, bool big_endian> |
| 177 | void |
| 178 | Output_section_headers::do_sized_write(Output_file* of) |
| 179 | { |
| 180 | off_t all_shdrs_size = this->data_size(); |
| 181 | unsigned char* view = of->get_output_view(this->offset(), all_shdrs_size); |
| 182 | |
| 183 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 184 | unsigned char* v = view; |
| 185 | |
| 186 | { |
| 187 | typename elfcpp::Shdr_write<size, big_endian> oshdr(v); |
| 188 | oshdr.put_sh_name(0); |
| 189 | oshdr.put_sh_type(elfcpp::SHT_NULL); |
| 190 | oshdr.put_sh_flags(0); |
| 191 | oshdr.put_sh_addr(0); |
| 192 | oshdr.put_sh_offset(0); |
| 193 | |
| 194 | size_t section_count = (this->data_size() |
| 195 | / elfcpp::Elf_sizes<size>::shdr_size); |
| 196 | if (section_count < elfcpp::SHN_LORESERVE) |
| 197 | oshdr.put_sh_size(0); |
| 198 | else |
| 199 | oshdr.put_sh_size(section_count); |
| 200 | |
| 201 | unsigned int shstrndx = this->shstrtab_section_->out_shndx(); |
| 202 | if (shstrndx < elfcpp::SHN_LORESERVE) |
| 203 | oshdr.put_sh_link(0); |
| 204 | else |
| 205 | oshdr.put_sh_link(shstrndx); |
| 206 | |
| 207 | oshdr.put_sh_info(0); |
| 208 | oshdr.put_sh_addralign(0); |
| 209 | oshdr.put_sh_entsize(0); |
| 210 | } |
| 211 | |
| 212 | v += shdr_size; |
| 213 | |
| 214 | unsigned int shndx = 1; |
| 215 | if (!parameters->options().relocatable()) |
| 216 | { |
| 217 | for (Layout::Segment_list::const_iterator p = |
| 218 | this->segment_list_->begin(); |
| 219 | p != this->segment_list_->end(); |
| 220 | ++p) |
| 221 | v = (*p)->write_section_headers<size, big_endian>(this->layout_, |
| 222 | this->secnamepool_, |
| 223 | v, |
| 224 | &shndx); |
| 225 | } |
| 226 | else |
| 227 | { |
| 228 | for (Layout::Section_list::const_iterator p = |
| 229 | this->section_list_->begin(); |
| 230 | p != this->section_list_->end(); |
| 231 | ++p) |
| 232 | { |
| 233 | // We do unallocated sections below, except that group |
| 234 | // sections have to come first. |
| 235 | if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0 |
| 236 | && (*p)->type() != elfcpp::SHT_GROUP) |
| 237 | continue; |
| 238 | gold_assert(shndx == (*p)->out_shndx()); |
| 239 | elfcpp::Shdr_write<size, big_endian> oshdr(v); |
| 240 | (*p)->write_header(this->layout_, this->secnamepool_, &oshdr); |
| 241 | v += shdr_size; |
| 242 | ++shndx; |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | for (Layout::Section_list::const_iterator p = |
| 247 | this->unattached_section_list_->begin(); |
| 248 | p != this->unattached_section_list_->end(); |
| 249 | ++p) |
| 250 | { |
| 251 | // For a relocatable link, we did unallocated group sections |
| 252 | // above, since they have to come first. |
| 253 | if ((*p)->type() == elfcpp::SHT_GROUP |
| 254 | && parameters->options().relocatable()) |
| 255 | continue; |
| 256 | gold_assert(shndx == (*p)->out_shndx()); |
| 257 | elfcpp::Shdr_write<size, big_endian> oshdr(v); |
| 258 | (*p)->write_header(this->layout_, this->secnamepool_, &oshdr); |
| 259 | v += shdr_size; |
| 260 | ++shndx; |
| 261 | } |
| 262 | |
| 263 | of->write_output_view(this->offset(), all_shdrs_size, view); |
| 264 | } |
| 265 | |
| 266 | // Output_segment_header methods. |
| 267 | |
| 268 | Output_segment_headers::Output_segment_headers( |
| 269 | const Layout::Segment_list& segment_list) |
| 270 | : segment_list_(segment_list) |
| 271 | { |
| 272 | const int size = parameters->target().get_size(); |
| 273 | int phdr_size; |
| 274 | if (size == 32) |
| 275 | phdr_size = elfcpp::Elf_sizes<32>::phdr_size; |
| 276 | else if (size == 64) |
| 277 | phdr_size = elfcpp::Elf_sizes<64>::phdr_size; |
| 278 | else |
| 279 | gold_unreachable(); |
| 280 | |
| 281 | this->set_data_size(segment_list.size() * phdr_size); |
| 282 | } |
| 283 | |
| 284 | void |
| 285 | Output_segment_headers::do_write(Output_file* of) |
| 286 | { |
| 287 | switch (parameters->size_and_endianness()) |
| 288 | { |
| 289 | #ifdef HAVE_TARGET_32_LITTLE |
| 290 | case Parameters::TARGET_32_LITTLE: |
| 291 | this->do_sized_write<32, false>(of); |
| 292 | break; |
| 293 | #endif |
| 294 | #ifdef HAVE_TARGET_32_BIG |
| 295 | case Parameters::TARGET_32_BIG: |
| 296 | this->do_sized_write<32, true>(of); |
| 297 | break; |
| 298 | #endif |
| 299 | #ifdef HAVE_TARGET_64_LITTLE |
| 300 | case Parameters::TARGET_64_LITTLE: |
| 301 | this->do_sized_write<64, false>(of); |
| 302 | break; |
| 303 | #endif |
| 304 | #ifdef HAVE_TARGET_64_BIG |
| 305 | case Parameters::TARGET_64_BIG: |
| 306 | this->do_sized_write<64, true>(of); |
| 307 | break; |
| 308 | #endif |
| 309 | default: |
| 310 | gold_unreachable(); |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | template<int size, bool big_endian> |
| 315 | void |
| 316 | Output_segment_headers::do_sized_write(Output_file* of) |
| 317 | { |
| 318 | const int phdr_size = elfcpp::Elf_sizes<size>::phdr_size; |
| 319 | off_t all_phdrs_size = this->segment_list_.size() * phdr_size; |
| 320 | gold_assert(all_phdrs_size == this->data_size()); |
| 321 | unsigned char* view = of->get_output_view(this->offset(), |
| 322 | all_phdrs_size); |
| 323 | unsigned char* v = view; |
| 324 | for (Layout::Segment_list::const_iterator p = this->segment_list_.begin(); |
| 325 | p != this->segment_list_.end(); |
| 326 | ++p) |
| 327 | { |
| 328 | elfcpp::Phdr_write<size, big_endian> ophdr(v); |
| 329 | (*p)->write_header(&ophdr); |
| 330 | v += phdr_size; |
| 331 | } |
| 332 | |
| 333 | gold_assert(v - view == all_phdrs_size); |
| 334 | |
| 335 | of->write_output_view(this->offset(), all_phdrs_size, view); |
| 336 | } |
| 337 | |
| 338 | // Output_file_header methods. |
| 339 | |
| 340 | Output_file_header::Output_file_header(const Target* target, |
| 341 | const Symbol_table* symtab, |
| 342 | const Output_segment_headers* osh, |
| 343 | const char* entry) |
| 344 | : target_(target), |
| 345 | symtab_(symtab), |
| 346 | segment_header_(osh), |
| 347 | section_header_(NULL), |
| 348 | shstrtab_(NULL), |
| 349 | entry_(entry) |
| 350 | { |
| 351 | const int size = parameters->target().get_size(); |
| 352 | int ehdr_size; |
| 353 | if (size == 32) |
| 354 | ehdr_size = elfcpp::Elf_sizes<32>::ehdr_size; |
| 355 | else if (size == 64) |
| 356 | ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size; |
| 357 | else |
| 358 | gold_unreachable(); |
| 359 | |
| 360 | this->set_data_size(ehdr_size); |
| 361 | } |
| 362 | |
| 363 | // Set the section table information for a file header. |
| 364 | |
| 365 | void |
| 366 | Output_file_header::set_section_info(const Output_section_headers* shdrs, |
| 367 | const Output_section* shstrtab) |
| 368 | { |
| 369 | this->section_header_ = shdrs; |
| 370 | this->shstrtab_ = shstrtab; |
| 371 | } |
| 372 | |
| 373 | // Write out the file header. |
| 374 | |
| 375 | void |
| 376 | Output_file_header::do_write(Output_file* of) |
| 377 | { |
| 378 | gold_assert(this->offset() == 0); |
| 379 | |
| 380 | switch (parameters->size_and_endianness()) |
| 381 | { |
| 382 | #ifdef HAVE_TARGET_32_LITTLE |
| 383 | case Parameters::TARGET_32_LITTLE: |
| 384 | this->do_sized_write<32, false>(of); |
| 385 | break; |
| 386 | #endif |
| 387 | #ifdef HAVE_TARGET_32_BIG |
| 388 | case Parameters::TARGET_32_BIG: |
| 389 | this->do_sized_write<32, true>(of); |
| 390 | break; |
| 391 | #endif |
| 392 | #ifdef HAVE_TARGET_64_LITTLE |
| 393 | case Parameters::TARGET_64_LITTLE: |
| 394 | this->do_sized_write<64, false>(of); |
| 395 | break; |
| 396 | #endif |
| 397 | #ifdef HAVE_TARGET_64_BIG |
| 398 | case Parameters::TARGET_64_BIG: |
| 399 | this->do_sized_write<64, true>(of); |
| 400 | break; |
| 401 | #endif |
| 402 | default: |
| 403 | gold_unreachable(); |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | // Write out the file header with appropriate size and endianess. |
| 408 | |
| 409 | template<int size, bool big_endian> |
| 410 | void |
| 411 | Output_file_header::do_sized_write(Output_file* of) |
| 412 | { |
| 413 | gold_assert(this->offset() == 0); |
| 414 | |
| 415 | int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
| 416 | unsigned char* view = of->get_output_view(0, ehdr_size); |
| 417 | elfcpp::Ehdr_write<size, big_endian> oehdr(view); |
| 418 | |
| 419 | unsigned char e_ident[elfcpp::EI_NIDENT]; |
| 420 | memset(e_ident, 0, elfcpp::EI_NIDENT); |
| 421 | e_ident[elfcpp::EI_MAG0] = elfcpp::ELFMAG0; |
| 422 | e_ident[elfcpp::EI_MAG1] = elfcpp::ELFMAG1; |
| 423 | e_ident[elfcpp::EI_MAG2] = elfcpp::ELFMAG2; |
| 424 | e_ident[elfcpp::EI_MAG3] = elfcpp::ELFMAG3; |
| 425 | if (size == 32) |
| 426 | e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS32; |
| 427 | else if (size == 64) |
| 428 | e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS64; |
| 429 | else |
| 430 | gold_unreachable(); |
| 431 | e_ident[elfcpp::EI_DATA] = (big_endian |
| 432 | ? elfcpp::ELFDATA2MSB |
| 433 | : elfcpp::ELFDATA2LSB); |
| 434 | e_ident[elfcpp::EI_VERSION] = elfcpp::EV_CURRENT; |
| 435 | oehdr.put_e_ident(e_ident); |
| 436 | |
| 437 | elfcpp::ET e_type; |
| 438 | if (parameters->options().relocatable()) |
| 439 | e_type = elfcpp::ET_REL; |
| 440 | else if (parameters->options().shared()) |
| 441 | e_type = elfcpp::ET_DYN; |
| 442 | else |
| 443 | e_type = elfcpp::ET_EXEC; |
| 444 | oehdr.put_e_type(e_type); |
| 445 | |
| 446 | oehdr.put_e_machine(this->target_->machine_code()); |
| 447 | oehdr.put_e_version(elfcpp::EV_CURRENT); |
| 448 | |
| 449 | oehdr.put_e_entry(this->entry<size>()); |
| 450 | |
| 451 | if (this->segment_header_ == NULL) |
| 452 | oehdr.put_e_phoff(0); |
| 453 | else |
| 454 | oehdr.put_e_phoff(this->segment_header_->offset()); |
| 455 | |
| 456 | oehdr.put_e_shoff(this->section_header_->offset()); |
| 457 | |
| 458 | // FIXME: The target needs to set the flags. |
| 459 | oehdr.put_e_flags(0); |
| 460 | |
| 461 | oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size); |
| 462 | |
| 463 | if (this->segment_header_ == NULL) |
| 464 | { |
| 465 | oehdr.put_e_phentsize(0); |
| 466 | oehdr.put_e_phnum(0); |
| 467 | } |
| 468 | else |
| 469 | { |
| 470 | oehdr.put_e_phentsize(elfcpp::Elf_sizes<size>::phdr_size); |
| 471 | oehdr.put_e_phnum(this->segment_header_->data_size() |
| 472 | / elfcpp::Elf_sizes<size>::phdr_size); |
| 473 | } |
| 474 | |
| 475 | oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size); |
| 476 | size_t section_count = (this->section_header_->data_size() |
| 477 | / elfcpp::Elf_sizes<size>::shdr_size); |
| 478 | |
| 479 | if (section_count < elfcpp::SHN_LORESERVE) |
| 480 | oehdr.put_e_shnum(this->section_header_->data_size() |
| 481 | / elfcpp::Elf_sizes<size>::shdr_size); |
| 482 | else |
| 483 | oehdr.put_e_shnum(0); |
| 484 | |
| 485 | unsigned int shstrndx = this->shstrtab_->out_shndx(); |
| 486 | if (shstrndx < elfcpp::SHN_LORESERVE) |
| 487 | oehdr.put_e_shstrndx(this->shstrtab_->out_shndx()); |
| 488 | else |
| 489 | oehdr.put_e_shstrndx(elfcpp::SHN_XINDEX); |
| 490 | |
| 491 | // Let the target adjust the ELF header, e.g., to set EI_OSABI in |
| 492 | // the e_ident field. |
| 493 | parameters->target().adjust_elf_header(view, ehdr_size); |
| 494 | |
| 495 | of->write_output_view(0, ehdr_size, view); |
| 496 | } |
| 497 | |
| 498 | // Return the value to use for the entry address. THIS->ENTRY_ is the |
| 499 | // symbol specified on the command line, if any. |
| 500 | |
| 501 | template<int size> |
| 502 | typename elfcpp::Elf_types<size>::Elf_Addr |
| 503 | Output_file_header::entry() |
| 504 | { |
| 505 | const bool should_issue_warning = (this->entry_ != NULL |
| 506 | && !parameters->options().relocatable() |
| 507 | && !parameters->options().shared()); |
| 508 | |
| 509 | // FIXME: Need to support target specific entry symbol. |
| 510 | const char* entry = this->entry_; |
| 511 | if (entry == NULL) |
| 512 | entry = "_start"; |
| 513 | |
| 514 | Symbol* sym = this->symtab_->lookup(entry); |
| 515 | |
| 516 | typename Sized_symbol<size>::Value_type v; |
| 517 | if (sym != NULL) |
| 518 | { |
| 519 | Sized_symbol<size>* ssym; |
| 520 | ssym = this->symtab_->get_sized_symbol<size>(sym); |
| 521 | if (!ssym->is_defined() && should_issue_warning) |
| 522 | gold_warning("entry symbol '%s' exists but is not defined", entry); |
| 523 | v = ssym->value(); |
| 524 | } |
| 525 | else |
| 526 | { |
| 527 | // We couldn't find the entry symbol. See if we can parse it as |
| 528 | // a number. This supports, e.g., -e 0x1000. |
| 529 | char* endptr; |
| 530 | v = strtoull(entry, &endptr, 0); |
| 531 | if (*endptr != '\0') |
| 532 | { |
| 533 | if (should_issue_warning) |
| 534 | gold_warning("cannot find entry symbol '%s'", entry); |
| 535 | v = 0; |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | return v; |
| 540 | } |
| 541 | |
| 542 | // Output_data_const methods. |
| 543 | |
| 544 | void |
| 545 | Output_data_const::do_write(Output_file* of) |
| 546 | { |
| 547 | of->write(this->offset(), this->data_.data(), this->data_.size()); |
| 548 | } |
| 549 | |
| 550 | // Output_data_const_buffer methods. |
| 551 | |
| 552 | void |
| 553 | Output_data_const_buffer::do_write(Output_file* of) |
| 554 | { |
| 555 | of->write(this->offset(), this->p_, this->data_size()); |
| 556 | } |
| 557 | |
| 558 | // Output_section_data methods. |
| 559 | |
| 560 | // Record the output section, and set the entry size and such. |
| 561 | |
| 562 | void |
| 563 | Output_section_data::set_output_section(Output_section* os) |
| 564 | { |
| 565 | gold_assert(this->output_section_ == NULL); |
| 566 | this->output_section_ = os; |
| 567 | this->do_adjust_output_section(os); |
| 568 | } |
| 569 | |
| 570 | // Return the section index of the output section. |
| 571 | |
| 572 | unsigned int |
| 573 | Output_section_data::do_out_shndx() const |
| 574 | { |
| 575 | gold_assert(this->output_section_ != NULL); |
| 576 | return this->output_section_->out_shndx(); |
| 577 | } |
| 578 | |
| 579 | // Set the alignment, which means we may need to update the alignment |
| 580 | // of the output section. |
| 581 | |
| 582 | void |
| 583 | Output_section_data::set_addralign(uint64_t addralign) |
| 584 | { |
| 585 | this->addralign_ = addralign; |
| 586 | if (this->output_section_ != NULL |
| 587 | && this->output_section_->addralign() < addralign) |
| 588 | this->output_section_->set_addralign(addralign); |
| 589 | } |
| 590 | |
| 591 | // Output_data_strtab methods. |
| 592 | |
| 593 | // Set the final data size. |
| 594 | |
| 595 | void |
| 596 | Output_data_strtab::set_final_data_size() |
| 597 | { |
| 598 | this->strtab_->set_string_offsets(); |
| 599 | this->set_data_size(this->strtab_->get_strtab_size()); |
| 600 | } |
| 601 | |
| 602 | // Write out a string table. |
| 603 | |
| 604 | void |
| 605 | Output_data_strtab::do_write(Output_file* of) |
| 606 | { |
| 607 | this->strtab_->write(of, this->offset()); |
| 608 | } |
| 609 | |
| 610 | // Output_reloc methods. |
| 611 | |
| 612 | // A reloc against a global symbol. |
| 613 | |
| 614 | template<bool dynamic, int size, bool big_endian> |
| 615 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc( |
| 616 | Symbol* gsym, |
| 617 | unsigned int type, |
| 618 | Output_data* od, |
| 619 | Address address, |
| 620 | bool is_relative) |
| 621 | : address_(address), local_sym_index_(GSYM_CODE), type_(type), |
| 622 | is_relative_(is_relative), is_section_symbol_(false), shndx_(INVALID_CODE) |
| 623 | { |
| 624 | // this->type_ is a bitfield; make sure TYPE fits. |
| 625 | gold_assert(this->type_ == type); |
| 626 | this->u1_.gsym = gsym; |
| 627 | this->u2_.od = od; |
| 628 | if (dynamic) |
| 629 | this->set_needs_dynsym_index(); |
| 630 | } |
| 631 | |
| 632 | template<bool dynamic, int size, bool big_endian> |
| 633 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc( |
| 634 | Symbol* gsym, |
| 635 | unsigned int type, |
| 636 | Sized_relobj<size, big_endian>* relobj, |
| 637 | unsigned int shndx, |
| 638 | Address address, |
| 639 | bool is_relative) |
| 640 | : address_(address), local_sym_index_(GSYM_CODE), type_(type), |
| 641 | is_relative_(is_relative), is_section_symbol_(false), shndx_(shndx) |
| 642 | { |
| 643 | gold_assert(shndx != INVALID_CODE); |
| 644 | // this->type_ is a bitfield; make sure TYPE fits. |
| 645 | gold_assert(this->type_ == type); |
| 646 | this->u1_.gsym = gsym; |
| 647 | this->u2_.relobj = relobj; |
| 648 | if (dynamic) |
| 649 | this->set_needs_dynsym_index(); |
| 650 | } |
| 651 | |
| 652 | // A reloc against a local symbol. |
| 653 | |
| 654 | template<bool dynamic, int size, bool big_endian> |
| 655 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc( |
| 656 | Sized_relobj<size, big_endian>* relobj, |
| 657 | unsigned int local_sym_index, |
| 658 | unsigned int type, |
| 659 | Output_data* od, |
| 660 | Address address, |
| 661 | bool is_relative, |
| 662 | bool is_section_symbol) |
| 663 | : address_(address), local_sym_index_(local_sym_index), type_(type), |
| 664 | is_relative_(is_relative), is_section_symbol_(is_section_symbol), |
| 665 | shndx_(INVALID_CODE) |
| 666 | { |
| 667 | gold_assert(local_sym_index != GSYM_CODE |
| 668 | && local_sym_index != INVALID_CODE); |
| 669 | // this->type_ is a bitfield; make sure TYPE fits. |
| 670 | gold_assert(this->type_ == type); |
| 671 | this->u1_.relobj = relobj; |
| 672 | this->u2_.od = od; |
| 673 | if (dynamic) |
| 674 | this->set_needs_dynsym_index(); |
| 675 | } |
| 676 | |
| 677 | template<bool dynamic, int size, bool big_endian> |
| 678 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc( |
| 679 | Sized_relobj<size, big_endian>* relobj, |
| 680 | unsigned int local_sym_index, |
| 681 | unsigned int type, |
| 682 | unsigned int shndx, |
| 683 | Address address, |
| 684 | bool is_relative, |
| 685 | bool is_section_symbol) |
| 686 | : address_(address), local_sym_index_(local_sym_index), type_(type), |
| 687 | is_relative_(is_relative), is_section_symbol_(is_section_symbol), |
| 688 | shndx_(shndx) |
| 689 | { |
| 690 | gold_assert(local_sym_index != GSYM_CODE |
| 691 | && local_sym_index != INVALID_CODE); |
| 692 | gold_assert(shndx != INVALID_CODE); |
| 693 | // this->type_ is a bitfield; make sure TYPE fits. |
| 694 | gold_assert(this->type_ == type); |
| 695 | this->u1_.relobj = relobj; |
| 696 | this->u2_.relobj = relobj; |
| 697 | if (dynamic) |
| 698 | this->set_needs_dynsym_index(); |
| 699 | } |
| 700 | |
| 701 | // A reloc against the STT_SECTION symbol of an output section. |
| 702 | |
| 703 | template<bool dynamic, int size, bool big_endian> |
| 704 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc( |
| 705 | Output_section* os, |
| 706 | unsigned int type, |
| 707 | Output_data* od, |
| 708 | Address address) |
| 709 | : address_(address), local_sym_index_(SECTION_CODE), type_(type), |
| 710 | is_relative_(false), is_section_symbol_(true), shndx_(INVALID_CODE) |
| 711 | { |
| 712 | // this->type_ is a bitfield; make sure TYPE fits. |
| 713 | gold_assert(this->type_ == type); |
| 714 | this->u1_.os = os; |
| 715 | this->u2_.od = od; |
| 716 | if (dynamic) |
| 717 | this->set_needs_dynsym_index(); |
| 718 | else |
| 719 | os->set_needs_symtab_index(); |
| 720 | } |
| 721 | |
| 722 | template<bool dynamic, int size, bool big_endian> |
| 723 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc( |
| 724 | Output_section* os, |
| 725 | unsigned int type, |
| 726 | Sized_relobj<size, big_endian>* relobj, |
| 727 | unsigned int shndx, |
| 728 | Address address) |
| 729 | : address_(address), local_sym_index_(SECTION_CODE), type_(type), |
| 730 | is_relative_(false), is_section_symbol_(true), shndx_(shndx) |
| 731 | { |
| 732 | gold_assert(shndx != INVALID_CODE); |
| 733 | // this->type_ is a bitfield; make sure TYPE fits. |
| 734 | gold_assert(this->type_ == type); |
| 735 | this->u1_.os = os; |
| 736 | this->u2_.relobj = relobj; |
| 737 | if (dynamic) |
| 738 | this->set_needs_dynsym_index(); |
| 739 | else |
| 740 | os->set_needs_symtab_index(); |
| 741 | } |
| 742 | |
| 743 | // Record that we need a dynamic symbol index for this relocation. |
| 744 | |
| 745 | template<bool dynamic, int size, bool big_endian> |
| 746 | void |
| 747 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>:: |
| 748 | set_needs_dynsym_index() |
| 749 | { |
| 750 | if (this->is_relative_) |
| 751 | return; |
| 752 | switch (this->local_sym_index_) |
| 753 | { |
| 754 | case INVALID_CODE: |
| 755 | gold_unreachable(); |
| 756 | |
| 757 | case GSYM_CODE: |
| 758 | this->u1_.gsym->set_needs_dynsym_entry(); |
| 759 | break; |
| 760 | |
| 761 | case SECTION_CODE: |
| 762 | this->u1_.os->set_needs_dynsym_index(); |
| 763 | break; |
| 764 | |
| 765 | case 0: |
| 766 | break; |
| 767 | |
| 768 | default: |
| 769 | { |
| 770 | const unsigned int lsi = this->local_sym_index_; |
| 771 | if (!this->is_section_symbol_) |
| 772 | this->u1_.relobj->set_needs_output_dynsym_entry(lsi); |
| 773 | else |
| 774 | this->u1_.relobj->output_section(lsi)->set_needs_dynsym_index(); |
| 775 | } |
| 776 | break; |
| 777 | } |
| 778 | } |
| 779 | |
| 780 | // Get the symbol index of a relocation. |
| 781 | |
| 782 | template<bool dynamic, int size, bool big_endian> |
| 783 | unsigned int |
| 784 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::get_symbol_index() |
| 785 | const |
| 786 | { |
| 787 | unsigned int index; |
| 788 | switch (this->local_sym_index_) |
| 789 | { |
| 790 | case INVALID_CODE: |
| 791 | gold_unreachable(); |
| 792 | |
| 793 | case GSYM_CODE: |
| 794 | if (this->u1_.gsym == NULL) |
| 795 | index = 0; |
| 796 | else if (dynamic) |
| 797 | index = this->u1_.gsym->dynsym_index(); |
| 798 | else |
| 799 | index = this->u1_.gsym->symtab_index(); |
| 800 | break; |
| 801 | |
| 802 | case SECTION_CODE: |
| 803 | if (dynamic) |
| 804 | index = this->u1_.os->dynsym_index(); |
| 805 | else |
| 806 | index = this->u1_.os->symtab_index(); |
| 807 | break; |
| 808 | |
| 809 | case 0: |
| 810 | // Relocations without symbols use a symbol index of 0. |
| 811 | index = 0; |
| 812 | break; |
| 813 | |
| 814 | default: |
| 815 | { |
| 816 | const unsigned int lsi = this->local_sym_index_; |
| 817 | if (!this->is_section_symbol_) |
| 818 | { |
| 819 | if (dynamic) |
| 820 | index = this->u1_.relobj->dynsym_index(lsi); |
| 821 | else |
| 822 | index = this->u1_.relobj->symtab_index(lsi); |
| 823 | } |
| 824 | else |
| 825 | { |
| 826 | Output_section* os = this->u1_.relobj->output_section(lsi); |
| 827 | gold_assert(os != NULL); |
| 828 | if (dynamic) |
| 829 | index = os->dynsym_index(); |
| 830 | else |
| 831 | index = os->symtab_index(); |
| 832 | } |
| 833 | } |
| 834 | break; |
| 835 | } |
| 836 | gold_assert(index != -1U); |
| 837 | return index; |
| 838 | } |
| 839 | |
| 840 | // For a local section symbol, get the address of the offset ADDEND |
| 841 | // within the input section. |
| 842 | |
| 843 | template<bool dynamic, int size, bool big_endian> |
| 844 | typename elfcpp::Elf_types<size>::Elf_Addr |
| 845 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>:: |
| 846 | local_section_offset(Addend addend) const |
| 847 | { |
| 848 | gold_assert(this->local_sym_index_ != GSYM_CODE |
| 849 | && this->local_sym_index_ != SECTION_CODE |
| 850 | && this->local_sym_index_ != INVALID_CODE |
| 851 | && this->is_section_symbol_); |
| 852 | const unsigned int lsi = this->local_sym_index_; |
| 853 | Output_section* os = this->u1_.relobj->output_section(lsi); |
| 854 | gold_assert(os != NULL); |
| 855 | Address offset = this->u1_.relobj->get_output_section_offset(lsi); |
| 856 | if (offset != invalid_address) |
| 857 | return offset + addend; |
| 858 | // This is a merge section. |
| 859 | offset = os->output_address(this->u1_.relobj, lsi, addend); |
| 860 | gold_assert(offset != invalid_address); |
| 861 | return offset; |
| 862 | } |
| 863 | |
| 864 | // Get the output address of a relocation. |
| 865 | |
| 866 | template<bool dynamic, int size, bool big_endian> |
| 867 | typename elfcpp::Elf_types<size>::Elf_Addr |
| 868 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::get_address() const |
| 869 | { |
| 870 | Address address = this->address_; |
| 871 | if (this->shndx_ != INVALID_CODE) |
| 872 | { |
| 873 | Output_section* os = this->u2_.relobj->output_section(this->shndx_); |
| 874 | gold_assert(os != NULL); |
| 875 | Address off = this->u2_.relobj->get_output_section_offset(this->shndx_); |
| 876 | if (off != invalid_address) |
| 877 | address += os->address() + off; |
| 878 | else |
| 879 | { |
| 880 | address = os->output_address(this->u2_.relobj, this->shndx_, |
| 881 | address); |
| 882 | gold_assert(address != invalid_address); |
| 883 | } |
| 884 | } |
| 885 | else if (this->u2_.od != NULL) |
| 886 | address += this->u2_.od->address(); |
| 887 | return address; |
| 888 | } |
| 889 | |
| 890 | // Write out the offset and info fields of a Rel or Rela relocation |
| 891 | // entry. |
| 892 | |
| 893 | template<bool dynamic, int size, bool big_endian> |
| 894 | template<typename Write_rel> |
| 895 | void |
| 896 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write_rel( |
| 897 | Write_rel* wr) const |
| 898 | { |
| 899 | wr->put_r_offset(this->get_address()); |
| 900 | unsigned int sym_index = this->is_relative_ ? 0 : this->get_symbol_index(); |
| 901 | wr->put_r_info(elfcpp::elf_r_info<size>(sym_index, this->type_)); |
| 902 | } |
| 903 | |
| 904 | // Write out a Rel relocation. |
| 905 | |
| 906 | template<bool dynamic, int size, bool big_endian> |
| 907 | void |
| 908 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write( |
| 909 | unsigned char* pov) const |
| 910 | { |
| 911 | elfcpp::Rel_write<size, big_endian> orel(pov); |
| 912 | this->write_rel(&orel); |
| 913 | } |
| 914 | |
| 915 | // Get the value of the symbol referred to by a Rel relocation. |
| 916 | |
| 917 | template<bool dynamic, int size, bool big_endian> |
| 918 | typename elfcpp::Elf_types<size>::Elf_Addr |
| 919 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::symbol_value( |
| 920 | Addend addend) const |
| 921 | { |
| 922 | if (this->local_sym_index_ == GSYM_CODE) |
| 923 | { |
| 924 | const Sized_symbol<size>* sym; |
| 925 | sym = static_cast<const Sized_symbol<size>*>(this->u1_.gsym); |
| 926 | return sym->value() + addend; |
| 927 | } |
| 928 | gold_assert(this->local_sym_index_ != SECTION_CODE |
| 929 | && this->local_sym_index_ != INVALID_CODE |
| 930 | && !this->is_section_symbol_); |
| 931 | const unsigned int lsi = this->local_sym_index_; |
| 932 | const Symbol_value<size>* symval = this->u1_.relobj->local_symbol(lsi); |
| 933 | return symval->value(this->u1_.relobj, addend); |
| 934 | } |
| 935 | |
| 936 | // Reloc comparison. This function sorts the dynamic relocs for the |
| 937 | // benefit of the dynamic linker. First we sort all relative relocs |
| 938 | // to the front. Among relative relocs, we sort by output address. |
| 939 | // Among non-relative relocs, we sort by symbol index, then by output |
| 940 | // address. |
| 941 | |
| 942 | template<bool dynamic, int size, bool big_endian> |
| 943 | int |
| 944 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>:: |
| 945 | compare(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>& r2) |
| 946 | const |
| 947 | { |
| 948 | if (this->is_relative_) |
| 949 | { |
| 950 | if (!r2.is_relative_) |
| 951 | return -1; |
| 952 | // Otherwise sort by reloc address below. |
| 953 | } |
| 954 | else if (r2.is_relative_) |
| 955 | return 1; |
| 956 | else |
| 957 | { |
| 958 | unsigned int sym1 = this->get_symbol_index(); |
| 959 | unsigned int sym2 = r2.get_symbol_index(); |
| 960 | if (sym1 < sym2) |
| 961 | return -1; |
| 962 | else if (sym1 > sym2) |
| 963 | return 1; |
| 964 | // Otherwise sort by reloc address. |
| 965 | } |
| 966 | |
| 967 | section_offset_type addr1 = this->get_address(); |
| 968 | section_offset_type addr2 = r2.get_address(); |
| 969 | if (addr1 < addr2) |
| 970 | return -1; |
| 971 | else if (addr1 > addr2) |
| 972 | return 1; |
| 973 | |
| 974 | // Final tie breaker, in order to generate the same output on any |
| 975 | // host: reloc type. |
| 976 | unsigned int type1 = this->type_; |
| 977 | unsigned int type2 = r2.type_; |
| 978 | if (type1 < type2) |
| 979 | return -1; |
| 980 | else if (type1 > type2) |
| 981 | return 1; |
| 982 | |
| 983 | // These relocs appear to be exactly the same. |
| 984 | return 0; |
| 985 | } |
| 986 | |
| 987 | // Write out a Rela relocation. |
| 988 | |
| 989 | template<bool dynamic, int size, bool big_endian> |
| 990 | void |
| 991 | Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>::write( |
| 992 | unsigned char* pov) const |
| 993 | { |
| 994 | elfcpp::Rela_write<size, big_endian> orel(pov); |
| 995 | this->rel_.write_rel(&orel); |
| 996 | Addend addend = this->addend_; |
| 997 | if (this->rel_.is_relative()) |
| 998 | addend = this->rel_.symbol_value(addend); |
| 999 | else if (this->rel_.is_local_section_symbol()) |
| 1000 | addend = this->rel_.local_section_offset(addend); |
| 1001 | orel.put_r_addend(addend); |
| 1002 | } |
| 1003 | |
| 1004 | // Output_data_reloc_base methods. |
| 1005 | |
| 1006 | // Adjust the output section. |
| 1007 | |
| 1008 | template<int sh_type, bool dynamic, int size, bool big_endian> |
| 1009 | void |
| 1010 | Output_data_reloc_base<sh_type, dynamic, size, big_endian> |
| 1011 | ::do_adjust_output_section(Output_section* os) |
| 1012 | { |
| 1013 | if (sh_type == elfcpp::SHT_REL) |
| 1014 | os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); |
| 1015 | else if (sh_type == elfcpp::SHT_RELA) |
| 1016 | os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); |
| 1017 | else |
| 1018 | gold_unreachable(); |
| 1019 | if (dynamic) |
| 1020 | os->set_should_link_to_dynsym(); |
| 1021 | else |
| 1022 | os->set_should_link_to_symtab(); |
| 1023 | } |
| 1024 | |
| 1025 | // Write out relocation data. |
| 1026 | |
| 1027 | template<int sh_type, bool dynamic, int size, bool big_endian> |
| 1028 | void |
| 1029 | Output_data_reloc_base<sh_type, dynamic, size, big_endian>::do_write( |
| 1030 | Output_file* of) |
| 1031 | { |
| 1032 | const off_t off = this->offset(); |
| 1033 | const off_t oview_size = this->data_size(); |
| 1034 | unsigned char* const oview = of->get_output_view(off, oview_size); |
| 1035 | |
| 1036 | if (this->sort_relocs_) |
| 1037 | { |
| 1038 | gold_assert(dynamic); |
| 1039 | std::sort(this->relocs_.begin(), this->relocs_.end(), |
| 1040 | Sort_relocs_comparison()); |
| 1041 | } |
| 1042 | |
| 1043 | unsigned char* pov = oview; |
| 1044 | for (typename Relocs::const_iterator p = this->relocs_.begin(); |
| 1045 | p != this->relocs_.end(); |
| 1046 | ++p) |
| 1047 | { |
| 1048 | p->write(pov); |
| 1049 | pov += reloc_size; |
| 1050 | } |
| 1051 | |
| 1052 | gold_assert(pov - oview == oview_size); |
| 1053 | |
| 1054 | of->write_output_view(off, oview_size, oview); |
| 1055 | |
| 1056 | // We no longer need the relocation entries. |
| 1057 | this->relocs_.clear(); |
| 1058 | } |
| 1059 | |
| 1060 | // Class Output_relocatable_relocs. |
| 1061 | |
| 1062 | template<int sh_type, int size, bool big_endian> |
| 1063 | void |
| 1064 | Output_relocatable_relocs<sh_type, size, big_endian>::set_final_data_size() |
| 1065 | { |
| 1066 | this->set_data_size(this->rr_->output_reloc_count() |
| 1067 | * Reloc_types<sh_type, size, big_endian>::reloc_size); |
| 1068 | } |
| 1069 | |
| 1070 | // class Output_data_group. |
| 1071 | |
| 1072 | template<int size, bool big_endian> |
| 1073 | Output_data_group<size, big_endian>::Output_data_group( |
| 1074 | Sized_relobj<size, big_endian>* relobj, |
| 1075 | section_size_type entry_count, |
| 1076 | elfcpp::Elf_Word flags, |
| 1077 | std::vector<unsigned int>* input_shndxes) |
| 1078 | : Output_section_data(entry_count * 4, 4), |
| 1079 | relobj_(relobj), |
| 1080 | flags_(flags) |
| 1081 | { |
| 1082 | this->input_shndxes_.swap(*input_shndxes); |
| 1083 | } |
| 1084 | |
| 1085 | // Write out the section group, which means translating the section |
| 1086 | // indexes to apply to the output file. |
| 1087 | |
| 1088 | template<int size, bool big_endian> |
| 1089 | void |
| 1090 | Output_data_group<size, big_endian>::do_write(Output_file* of) |
| 1091 | { |
| 1092 | const off_t off = this->offset(); |
| 1093 | const section_size_type oview_size = |
| 1094 | convert_to_section_size_type(this->data_size()); |
| 1095 | unsigned char* const oview = of->get_output_view(off, oview_size); |
| 1096 | |
| 1097 | elfcpp::Elf_Word* contents = reinterpret_cast<elfcpp::Elf_Word*>(oview); |
| 1098 | elfcpp::Swap<32, big_endian>::writeval(contents, this->flags_); |
| 1099 | ++contents; |
| 1100 | |
| 1101 | for (std::vector<unsigned int>::const_iterator p = |
| 1102 | this->input_shndxes_.begin(); |
| 1103 | p != this->input_shndxes_.end(); |
| 1104 | ++p, ++contents) |
| 1105 | { |
| 1106 | Output_section* os = this->relobj_->output_section(*p); |
| 1107 | |
| 1108 | unsigned int output_shndx; |
| 1109 | if (os != NULL) |
| 1110 | output_shndx = os->out_shndx(); |
| 1111 | else |
| 1112 | { |
| 1113 | this->relobj_->error(_("section group retained but " |
| 1114 | "group element discarded")); |
| 1115 | output_shndx = 0; |
| 1116 | } |
| 1117 | |
| 1118 | elfcpp::Swap<32, big_endian>::writeval(contents, output_shndx); |
| 1119 | } |
| 1120 | |
| 1121 | size_t wrote = reinterpret_cast<unsigned char*>(contents) - oview; |
| 1122 | gold_assert(wrote == oview_size); |
| 1123 | |
| 1124 | of->write_output_view(off, oview_size, oview); |
| 1125 | |
| 1126 | // We no longer need this information. |
| 1127 | this->input_shndxes_.clear(); |
| 1128 | } |
| 1129 | |
| 1130 | // Output_data_got::Got_entry methods. |
| 1131 | |
| 1132 | // Write out the entry. |
| 1133 | |
| 1134 | template<int size, bool big_endian> |
| 1135 | void |
| 1136 | Output_data_got<size, big_endian>::Got_entry::write(unsigned char* pov) const |
| 1137 | { |
| 1138 | Valtype val = 0; |
| 1139 | |
| 1140 | switch (this->local_sym_index_) |
| 1141 | { |
| 1142 | case GSYM_CODE: |
| 1143 | { |
| 1144 | // If the symbol is resolved locally, we need to write out the |
| 1145 | // link-time value, which will be relocated dynamically by a |
| 1146 | // RELATIVE relocation. |
| 1147 | Symbol* gsym = this->u_.gsym; |
| 1148 | Sized_symbol<size>* sgsym; |
| 1149 | // This cast is a bit ugly. We don't want to put a |
| 1150 | // virtual method in Symbol, because we want Symbol to be |
| 1151 | // as small as possible. |
| 1152 | sgsym = static_cast<Sized_symbol<size>*>(gsym); |
| 1153 | val = sgsym->value(); |
| 1154 | } |
| 1155 | break; |
| 1156 | |
| 1157 | case CONSTANT_CODE: |
| 1158 | val = this->u_.constant; |
| 1159 | break; |
| 1160 | |
| 1161 | default: |
| 1162 | { |
| 1163 | const unsigned int lsi = this->local_sym_index_; |
| 1164 | const Symbol_value<size>* symval = this->u_.object->local_symbol(lsi); |
| 1165 | val = symval->value(this->u_.object, 0); |
| 1166 | } |
| 1167 | break; |
| 1168 | } |
| 1169 | |
| 1170 | elfcpp::Swap<size, big_endian>::writeval(pov, val); |
| 1171 | } |
| 1172 | |
| 1173 | // Output_data_got methods. |
| 1174 | |
| 1175 | // Add an entry for a global symbol to the GOT. This returns true if |
| 1176 | // this is a new GOT entry, false if the symbol already had a GOT |
| 1177 | // entry. |
| 1178 | |
| 1179 | template<int size, bool big_endian> |
| 1180 | bool |
| 1181 | Output_data_got<size, big_endian>::add_global( |
| 1182 | Symbol* gsym, |
| 1183 | unsigned int got_type) |
| 1184 | { |
| 1185 | if (gsym->has_got_offset(got_type)) |
| 1186 | return false; |
| 1187 | |
| 1188 | this->entries_.push_back(Got_entry(gsym)); |
| 1189 | this->set_got_size(); |
| 1190 | gsym->set_got_offset(got_type, this->last_got_offset()); |
| 1191 | return true; |
| 1192 | } |
| 1193 | |
| 1194 | // Add an entry for a global symbol to the GOT, and add a dynamic |
| 1195 | // relocation of type R_TYPE for the GOT entry. |
| 1196 | template<int size, bool big_endian> |
| 1197 | void |
| 1198 | Output_data_got<size, big_endian>::add_global_with_rel( |
| 1199 | Symbol* gsym, |
| 1200 | unsigned int got_type, |
| 1201 | Rel_dyn* rel_dyn, |
| 1202 | unsigned int r_type) |
| 1203 | { |
| 1204 | if (gsym->has_got_offset(got_type)) |
| 1205 | return; |
| 1206 | |
| 1207 | this->entries_.push_back(Got_entry()); |
| 1208 | this->set_got_size(); |
| 1209 | unsigned int got_offset = this->last_got_offset(); |
| 1210 | gsym->set_got_offset(got_type, got_offset); |
| 1211 | rel_dyn->add_global(gsym, r_type, this, got_offset); |
| 1212 | } |
| 1213 | |
| 1214 | template<int size, bool big_endian> |
| 1215 | void |
| 1216 | Output_data_got<size, big_endian>::add_global_with_rela( |
| 1217 | Symbol* gsym, |
| 1218 | unsigned int got_type, |
| 1219 | Rela_dyn* rela_dyn, |
| 1220 | unsigned int r_type) |
| 1221 | { |
| 1222 | if (gsym->has_got_offset(got_type)) |
| 1223 | return; |
| 1224 | |
| 1225 | this->entries_.push_back(Got_entry()); |
| 1226 | this->set_got_size(); |
| 1227 | unsigned int got_offset = this->last_got_offset(); |
| 1228 | gsym->set_got_offset(got_type, got_offset); |
| 1229 | rela_dyn->add_global(gsym, r_type, this, got_offset, 0); |
| 1230 | } |
| 1231 | |
| 1232 | // Add a pair of entries for a global symbol to the GOT, and add |
| 1233 | // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively. |
| 1234 | // If R_TYPE_2 == 0, add the second entry with no relocation. |
| 1235 | template<int size, bool big_endian> |
| 1236 | void |
| 1237 | Output_data_got<size, big_endian>::add_global_pair_with_rel( |
| 1238 | Symbol* gsym, |
| 1239 | unsigned int got_type, |
| 1240 | Rel_dyn* rel_dyn, |
| 1241 | unsigned int r_type_1, |
| 1242 | unsigned int r_type_2) |
| 1243 | { |
| 1244 | if (gsym->has_got_offset(got_type)) |
| 1245 | return; |
| 1246 | |
| 1247 | this->entries_.push_back(Got_entry()); |
| 1248 | unsigned int got_offset = this->last_got_offset(); |
| 1249 | gsym->set_got_offset(got_type, got_offset); |
| 1250 | rel_dyn->add_global(gsym, r_type_1, this, got_offset); |
| 1251 | |
| 1252 | this->entries_.push_back(Got_entry()); |
| 1253 | if (r_type_2 != 0) |
| 1254 | { |
| 1255 | got_offset = this->last_got_offset(); |
| 1256 | rel_dyn->add_global(gsym, r_type_2, this, got_offset); |
| 1257 | } |
| 1258 | |
| 1259 | this->set_got_size(); |
| 1260 | } |
| 1261 | |
| 1262 | template<int size, bool big_endian> |
| 1263 | void |
| 1264 | Output_data_got<size, big_endian>::add_global_pair_with_rela( |
| 1265 | Symbol* gsym, |
| 1266 | unsigned int got_type, |
| 1267 | Rela_dyn* rela_dyn, |
| 1268 | unsigned int r_type_1, |
| 1269 | unsigned int r_type_2) |
| 1270 | { |
| 1271 | if (gsym->has_got_offset(got_type)) |
| 1272 | return; |
| 1273 | |
| 1274 | this->entries_.push_back(Got_entry()); |
| 1275 | unsigned int got_offset = this->last_got_offset(); |
| 1276 | gsym->set_got_offset(got_type, got_offset); |
| 1277 | rela_dyn->add_global(gsym, r_type_1, this, got_offset, 0); |
| 1278 | |
| 1279 | this->entries_.push_back(Got_entry()); |
| 1280 | if (r_type_2 != 0) |
| 1281 | { |
| 1282 | got_offset = this->last_got_offset(); |
| 1283 | rela_dyn->add_global(gsym, r_type_2, this, got_offset, 0); |
| 1284 | } |
| 1285 | |
| 1286 | this->set_got_size(); |
| 1287 | } |
| 1288 | |
| 1289 | // Add an entry for a local symbol to the GOT. This returns true if |
| 1290 | // this is a new GOT entry, false if the symbol already has a GOT |
| 1291 | // entry. |
| 1292 | |
| 1293 | template<int size, bool big_endian> |
| 1294 | bool |
| 1295 | Output_data_got<size, big_endian>::add_local( |
| 1296 | Sized_relobj<size, big_endian>* object, |
| 1297 | unsigned int symndx, |
| 1298 | unsigned int got_type) |
| 1299 | { |
| 1300 | if (object->local_has_got_offset(symndx, got_type)) |
| 1301 | return false; |
| 1302 | |
| 1303 | this->entries_.push_back(Got_entry(object, symndx)); |
| 1304 | this->set_got_size(); |
| 1305 | object->set_local_got_offset(symndx, got_type, this->last_got_offset()); |
| 1306 | return true; |
| 1307 | } |
| 1308 | |
| 1309 | // Add an entry for a local symbol to the GOT, and add a dynamic |
| 1310 | // relocation of type R_TYPE for the GOT entry. |
| 1311 | template<int size, bool big_endian> |
| 1312 | void |
| 1313 | Output_data_got<size, big_endian>::add_local_with_rel( |
| 1314 | Sized_relobj<size, big_endian>* object, |
| 1315 | unsigned int symndx, |
| 1316 | unsigned int got_type, |
| 1317 | Rel_dyn* rel_dyn, |
| 1318 | unsigned int r_type) |
| 1319 | { |
| 1320 | if (object->local_has_got_offset(symndx, got_type)) |
| 1321 | return; |
| 1322 | |
| 1323 | this->entries_.push_back(Got_entry()); |
| 1324 | this->set_got_size(); |
| 1325 | unsigned int got_offset = this->last_got_offset(); |
| 1326 | object->set_local_got_offset(symndx, got_type, got_offset); |
| 1327 | rel_dyn->add_local(object, symndx, r_type, this, got_offset); |
| 1328 | } |
| 1329 | |
| 1330 | template<int size, bool big_endian> |
| 1331 | void |
| 1332 | Output_data_got<size, big_endian>::add_local_with_rela( |
| 1333 | Sized_relobj<size, big_endian>* object, |
| 1334 | unsigned int symndx, |
| 1335 | unsigned int got_type, |
| 1336 | Rela_dyn* rela_dyn, |
| 1337 | unsigned int r_type) |
| 1338 | { |
| 1339 | if (object->local_has_got_offset(symndx, got_type)) |
| 1340 | return; |
| 1341 | |
| 1342 | this->entries_.push_back(Got_entry()); |
| 1343 | this->set_got_size(); |
| 1344 | unsigned int got_offset = this->last_got_offset(); |
| 1345 | object->set_local_got_offset(symndx, got_type, got_offset); |
| 1346 | rela_dyn->add_local(object, symndx, r_type, this, got_offset, 0); |
| 1347 | } |
| 1348 | |
| 1349 | // Add a pair of entries for a local symbol to the GOT, and add |
| 1350 | // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively. |
| 1351 | // If R_TYPE_2 == 0, add the second entry with no relocation. |
| 1352 | template<int size, bool big_endian> |
| 1353 | void |
| 1354 | Output_data_got<size, big_endian>::add_local_pair_with_rel( |
| 1355 | Sized_relobj<size, big_endian>* object, |
| 1356 | unsigned int symndx, |
| 1357 | unsigned int shndx, |
| 1358 | unsigned int got_type, |
| 1359 | Rel_dyn* rel_dyn, |
| 1360 | unsigned int r_type_1, |
| 1361 | unsigned int r_type_2) |
| 1362 | { |
| 1363 | if (object->local_has_got_offset(symndx, got_type)) |
| 1364 | return; |
| 1365 | |
| 1366 | this->entries_.push_back(Got_entry()); |
| 1367 | unsigned int got_offset = this->last_got_offset(); |
| 1368 | object->set_local_got_offset(symndx, got_type, got_offset); |
| 1369 | Output_section* os = object->output_section(shndx); |
| 1370 | rel_dyn->add_output_section(os, r_type_1, this, got_offset); |
| 1371 | |
| 1372 | this->entries_.push_back(Got_entry(object, symndx)); |
| 1373 | if (r_type_2 != 0) |
| 1374 | { |
| 1375 | got_offset = this->last_got_offset(); |
| 1376 | rel_dyn->add_output_section(os, r_type_2, this, got_offset); |
| 1377 | } |
| 1378 | |
| 1379 | this->set_got_size(); |
| 1380 | } |
| 1381 | |
| 1382 | template<int size, bool big_endian> |
| 1383 | void |
| 1384 | Output_data_got<size, big_endian>::add_local_pair_with_rela( |
| 1385 | Sized_relobj<size, big_endian>* object, |
| 1386 | unsigned int symndx, |
| 1387 | unsigned int shndx, |
| 1388 | unsigned int got_type, |
| 1389 | Rela_dyn* rela_dyn, |
| 1390 | unsigned int r_type_1, |
| 1391 | unsigned int r_type_2) |
| 1392 | { |
| 1393 | if (object->local_has_got_offset(symndx, got_type)) |
| 1394 | return; |
| 1395 | |
| 1396 | this->entries_.push_back(Got_entry()); |
| 1397 | unsigned int got_offset = this->last_got_offset(); |
| 1398 | object->set_local_got_offset(symndx, got_type, got_offset); |
| 1399 | Output_section* os = object->output_section(shndx); |
| 1400 | rela_dyn->add_output_section(os, r_type_1, this, got_offset, 0); |
| 1401 | |
| 1402 | this->entries_.push_back(Got_entry(object, symndx)); |
| 1403 | if (r_type_2 != 0) |
| 1404 | { |
| 1405 | got_offset = this->last_got_offset(); |
| 1406 | rela_dyn->add_output_section(os, r_type_2, this, got_offset, 0); |
| 1407 | } |
| 1408 | |
| 1409 | this->set_got_size(); |
| 1410 | } |
| 1411 | |
| 1412 | // Write out the GOT. |
| 1413 | |
| 1414 | template<int size, bool big_endian> |
| 1415 | void |
| 1416 | Output_data_got<size, big_endian>::do_write(Output_file* of) |
| 1417 | { |
| 1418 | const int add = size / 8; |
| 1419 | |
| 1420 | const off_t off = this->offset(); |
| 1421 | const off_t oview_size = this->data_size(); |
| 1422 | unsigned char* const oview = of->get_output_view(off, oview_size); |
| 1423 | |
| 1424 | unsigned char* pov = oview; |
| 1425 | for (typename Got_entries::const_iterator p = this->entries_.begin(); |
| 1426 | p != this->entries_.end(); |
| 1427 | ++p) |
| 1428 | { |
| 1429 | p->write(pov); |
| 1430 | pov += add; |
| 1431 | } |
| 1432 | |
| 1433 | gold_assert(pov - oview == oview_size); |
| 1434 | |
| 1435 | of->write_output_view(off, oview_size, oview); |
| 1436 | |
| 1437 | // We no longer need the GOT entries. |
| 1438 | this->entries_.clear(); |
| 1439 | } |
| 1440 | |
| 1441 | // Output_data_dynamic::Dynamic_entry methods. |
| 1442 | |
| 1443 | // Write out the entry. |
| 1444 | |
| 1445 | template<int size, bool big_endian> |
| 1446 | void |
| 1447 | Output_data_dynamic::Dynamic_entry::write( |
| 1448 | unsigned char* pov, |
| 1449 | const Stringpool* pool) const |
| 1450 | { |
| 1451 | typename elfcpp::Elf_types<size>::Elf_WXword val; |
| 1452 | switch (this->offset_) |
| 1453 | { |
| 1454 | case DYNAMIC_NUMBER: |
| 1455 | val = this->u_.val; |
| 1456 | break; |
| 1457 | |
| 1458 | case DYNAMIC_SECTION_SIZE: |
| 1459 | val = this->u_.od->data_size(); |
| 1460 | break; |
| 1461 | |
| 1462 | case DYNAMIC_SYMBOL: |
| 1463 | { |
| 1464 | const Sized_symbol<size>* s = |
| 1465 | static_cast<const Sized_symbol<size>*>(this->u_.sym); |
| 1466 | val = s->value(); |
| 1467 | } |
| 1468 | break; |
| 1469 | |
| 1470 | case DYNAMIC_STRING: |
| 1471 | val = pool->get_offset(this->u_.str); |
| 1472 | break; |
| 1473 | |
| 1474 | default: |
| 1475 | val = this->u_.od->address() + this->offset_; |
| 1476 | break; |
| 1477 | } |
| 1478 | |
| 1479 | elfcpp::Dyn_write<size, big_endian> dw(pov); |
| 1480 | dw.put_d_tag(this->tag_); |
| 1481 | dw.put_d_val(val); |
| 1482 | } |
| 1483 | |
| 1484 | // Output_data_dynamic methods. |
| 1485 | |
| 1486 | // Adjust the output section to set the entry size. |
| 1487 | |
| 1488 | void |
| 1489 | Output_data_dynamic::do_adjust_output_section(Output_section* os) |
| 1490 | { |
| 1491 | if (parameters->target().get_size() == 32) |
| 1492 | os->set_entsize(elfcpp::Elf_sizes<32>::dyn_size); |
| 1493 | else if (parameters->target().get_size() == 64) |
| 1494 | os->set_entsize(elfcpp::Elf_sizes<64>::dyn_size); |
| 1495 | else |
| 1496 | gold_unreachable(); |
| 1497 | } |
| 1498 | |
| 1499 | // Set the final data size. |
| 1500 | |
| 1501 | void |
| 1502 | Output_data_dynamic::set_final_data_size() |
| 1503 | { |
| 1504 | // Add the terminating entry. |
| 1505 | this->add_constant(elfcpp::DT_NULL, 0); |
| 1506 | |
| 1507 | int dyn_size; |
| 1508 | if (parameters->target().get_size() == 32) |
| 1509 | dyn_size = elfcpp::Elf_sizes<32>::dyn_size; |
| 1510 | else if (parameters->target().get_size() == 64) |
| 1511 | dyn_size = elfcpp::Elf_sizes<64>::dyn_size; |
| 1512 | else |
| 1513 | gold_unreachable(); |
| 1514 | this->set_data_size(this->entries_.size() * dyn_size); |
| 1515 | } |
| 1516 | |
| 1517 | // Write out the dynamic entries. |
| 1518 | |
| 1519 | void |
| 1520 | Output_data_dynamic::do_write(Output_file* of) |
| 1521 | { |
| 1522 | switch (parameters->size_and_endianness()) |
| 1523 | { |
| 1524 | #ifdef HAVE_TARGET_32_LITTLE |
| 1525 | case Parameters::TARGET_32_LITTLE: |
| 1526 | this->sized_write<32, false>(of); |
| 1527 | break; |
| 1528 | #endif |
| 1529 | #ifdef HAVE_TARGET_32_BIG |
| 1530 | case Parameters::TARGET_32_BIG: |
| 1531 | this->sized_write<32, true>(of); |
| 1532 | break; |
| 1533 | #endif |
| 1534 | #ifdef HAVE_TARGET_64_LITTLE |
| 1535 | case Parameters::TARGET_64_LITTLE: |
| 1536 | this->sized_write<64, false>(of); |
| 1537 | break; |
| 1538 | #endif |
| 1539 | #ifdef HAVE_TARGET_64_BIG |
| 1540 | case Parameters::TARGET_64_BIG: |
| 1541 | this->sized_write<64, true>(of); |
| 1542 | break; |
| 1543 | #endif |
| 1544 | default: |
| 1545 | gold_unreachable(); |
| 1546 | } |
| 1547 | } |
| 1548 | |
| 1549 | template<int size, bool big_endian> |
| 1550 | void |
| 1551 | Output_data_dynamic::sized_write(Output_file* of) |
| 1552 | { |
| 1553 | const int dyn_size = elfcpp::Elf_sizes<size>::dyn_size; |
| 1554 | |
| 1555 | const off_t offset = this->offset(); |
| 1556 | const off_t oview_size = this->data_size(); |
| 1557 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 1558 | |
| 1559 | unsigned char* pov = oview; |
| 1560 | for (typename Dynamic_entries::const_iterator p = this->entries_.begin(); |
| 1561 | p != this->entries_.end(); |
| 1562 | ++p) |
| 1563 | { |
| 1564 | p->write<size, big_endian>(pov, this->pool_); |
| 1565 | pov += dyn_size; |
| 1566 | } |
| 1567 | |
| 1568 | gold_assert(pov - oview == oview_size); |
| 1569 | |
| 1570 | of->write_output_view(offset, oview_size, oview); |
| 1571 | |
| 1572 | // We no longer need the dynamic entries. |
| 1573 | this->entries_.clear(); |
| 1574 | } |
| 1575 | |
| 1576 | // Class Output_symtab_xindex. |
| 1577 | |
| 1578 | void |
| 1579 | Output_symtab_xindex::do_write(Output_file* of) |
| 1580 | { |
| 1581 | const off_t offset = this->offset(); |
| 1582 | const off_t oview_size = this->data_size(); |
| 1583 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 1584 | |
| 1585 | memset(oview, 0, oview_size); |
| 1586 | |
| 1587 | if (parameters->target().is_big_endian()) |
| 1588 | this->endian_do_write<true>(oview); |
| 1589 | else |
| 1590 | this->endian_do_write<false>(oview); |
| 1591 | |
| 1592 | of->write_output_view(offset, oview_size, oview); |
| 1593 | |
| 1594 | // We no longer need the data. |
| 1595 | this->entries_.clear(); |
| 1596 | } |
| 1597 | |
| 1598 | template<bool big_endian> |
| 1599 | void |
| 1600 | Output_symtab_xindex::endian_do_write(unsigned char* const oview) |
| 1601 | { |
| 1602 | for (Xindex_entries::const_iterator p = this->entries_.begin(); |
| 1603 | p != this->entries_.end(); |
| 1604 | ++p) |
| 1605 | elfcpp::Swap<32, big_endian>::writeval(oview + p->first * 4, p->second); |
| 1606 | } |
| 1607 | |
| 1608 | // Output_section::Input_section methods. |
| 1609 | |
| 1610 | // Return the data size. For an input section we store the size here. |
| 1611 | // For an Output_section_data, we have to ask it for the size. |
| 1612 | |
| 1613 | off_t |
| 1614 | Output_section::Input_section::data_size() const |
| 1615 | { |
| 1616 | if (this->is_input_section()) |
| 1617 | return this->u1_.data_size; |
| 1618 | else |
| 1619 | return this->u2_.posd->data_size(); |
| 1620 | } |
| 1621 | |
| 1622 | // Set the address and file offset. |
| 1623 | |
| 1624 | void |
| 1625 | Output_section::Input_section::set_address_and_file_offset( |
| 1626 | uint64_t address, |
| 1627 | off_t file_offset, |
| 1628 | off_t section_file_offset) |
| 1629 | { |
| 1630 | if (this->is_input_section()) |
| 1631 | this->u2_.object->set_section_offset(this->shndx_, |
| 1632 | file_offset - section_file_offset); |
| 1633 | else |
| 1634 | this->u2_.posd->set_address_and_file_offset(address, file_offset); |
| 1635 | } |
| 1636 | |
| 1637 | // Reset the address and file offset. |
| 1638 | |
| 1639 | void |
| 1640 | Output_section::Input_section::reset_address_and_file_offset() |
| 1641 | { |
| 1642 | if (!this->is_input_section()) |
| 1643 | this->u2_.posd->reset_address_and_file_offset(); |
| 1644 | } |
| 1645 | |
| 1646 | // Finalize the data size. |
| 1647 | |
| 1648 | void |
| 1649 | Output_section::Input_section::finalize_data_size() |
| 1650 | { |
| 1651 | if (!this->is_input_section()) |
| 1652 | this->u2_.posd->finalize_data_size(); |
| 1653 | } |
| 1654 | |
| 1655 | // Try to turn an input offset into an output offset. We want to |
| 1656 | // return the output offset relative to the start of this |
| 1657 | // Input_section in the output section. |
| 1658 | |
| 1659 | inline bool |
| 1660 | Output_section::Input_section::output_offset( |
| 1661 | const Relobj* object, |
| 1662 | unsigned int shndx, |
| 1663 | section_offset_type offset, |
| 1664 | section_offset_type *poutput) const |
| 1665 | { |
| 1666 | if (!this->is_input_section()) |
| 1667 | return this->u2_.posd->output_offset(object, shndx, offset, poutput); |
| 1668 | else |
| 1669 | { |
| 1670 | if (this->shndx_ != shndx || this->u2_.object != object) |
| 1671 | return false; |
| 1672 | *poutput = offset; |
| 1673 | return true; |
| 1674 | } |
| 1675 | } |
| 1676 | |
| 1677 | // Return whether this is the merge section for the input section |
| 1678 | // SHNDX in OBJECT. |
| 1679 | |
| 1680 | inline bool |
| 1681 | Output_section::Input_section::is_merge_section_for(const Relobj* object, |
| 1682 | unsigned int shndx) const |
| 1683 | { |
| 1684 | if (this->is_input_section()) |
| 1685 | return false; |
| 1686 | return this->u2_.posd->is_merge_section_for(object, shndx); |
| 1687 | } |
| 1688 | |
| 1689 | // Write out the data. We don't have to do anything for an input |
| 1690 | // section--they are handled via Object::relocate--but this is where |
| 1691 | // we write out the data for an Output_section_data. |
| 1692 | |
| 1693 | void |
| 1694 | Output_section::Input_section::write(Output_file* of) |
| 1695 | { |
| 1696 | if (!this->is_input_section()) |
| 1697 | this->u2_.posd->write(of); |
| 1698 | } |
| 1699 | |
| 1700 | // Write the data to a buffer. As for write(), we don't have to do |
| 1701 | // anything for an input section. |
| 1702 | |
| 1703 | void |
| 1704 | Output_section::Input_section::write_to_buffer(unsigned char* buffer) |
| 1705 | { |
| 1706 | if (!this->is_input_section()) |
| 1707 | this->u2_.posd->write_to_buffer(buffer); |
| 1708 | } |
| 1709 | |
| 1710 | // Print to a map file. |
| 1711 | |
| 1712 | void |
| 1713 | Output_section::Input_section::print_to_mapfile(Mapfile* mapfile) const |
| 1714 | { |
| 1715 | switch (this->shndx_) |
| 1716 | { |
| 1717 | case OUTPUT_SECTION_CODE: |
| 1718 | case MERGE_DATA_SECTION_CODE: |
| 1719 | case MERGE_STRING_SECTION_CODE: |
| 1720 | this->u2_.posd->print_to_mapfile(mapfile); |
| 1721 | break; |
| 1722 | |
| 1723 | default: |
| 1724 | mapfile->print_input_section(this->u2_.object, this->shndx_); |
| 1725 | break; |
| 1726 | } |
| 1727 | } |
| 1728 | |
| 1729 | // Output_section methods. |
| 1730 | |
| 1731 | // Construct an Output_section. NAME will point into a Stringpool. |
| 1732 | |
| 1733 | Output_section::Output_section(const char* name, elfcpp::Elf_Word type, |
| 1734 | elfcpp::Elf_Xword flags) |
| 1735 | : name_(name), |
| 1736 | addralign_(0), |
| 1737 | entsize_(0), |
| 1738 | load_address_(0), |
| 1739 | link_section_(NULL), |
| 1740 | link_(0), |
| 1741 | info_section_(NULL), |
| 1742 | info_symndx_(NULL), |
| 1743 | info_(0), |
| 1744 | type_(type), |
| 1745 | flags_(flags), |
| 1746 | out_shndx_(-1U), |
| 1747 | symtab_index_(0), |
| 1748 | dynsym_index_(0), |
| 1749 | input_sections_(), |
| 1750 | first_input_offset_(0), |
| 1751 | fills_(), |
| 1752 | postprocessing_buffer_(NULL), |
| 1753 | needs_symtab_index_(false), |
| 1754 | needs_dynsym_index_(false), |
| 1755 | should_link_to_symtab_(false), |
| 1756 | should_link_to_dynsym_(false), |
| 1757 | after_input_sections_(false), |
| 1758 | requires_postprocessing_(false), |
| 1759 | found_in_sections_clause_(false), |
| 1760 | has_load_address_(false), |
| 1761 | info_uses_section_index_(false), |
| 1762 | may_sort_attached_input_sections_(false), |
| 1763 | must_sort_attached_input_sections_(false), |
| 1764 | attached_input_sections_are_sorted_(false), |
| 1765 | is_relro_(false), |
| 1766 | is_relro_local_(false), |
| 1767 | tls_offset_(0) |
| 1768 | { |
| 1769 | // An unallocated section has no address. Forcing this means that |
| 1770 | // we don't need special treatment for symbols defined in debug |
| 1771 | // sections. |
| 1772 | if ((flags & elfcpp::SHF_ALLOC) == 0) |
| 1773 | this->set_address(0); |
| 1774 | } |
| 1775 | |
| 1776 | Output_section::~Output_section() |
| 1777 | { |
| 1778 | } |
| 1779 | |
| 1780 | // Set the entry size. |
| 1781 | |
| 1782 | void |
| 1783 | Output_section::set_entsize(uint64_t v) |
| 1784 | { |
| 1785 | if (this->entsize_ == 0) |
| 1786 | this->entsize_ = v; |
| 1787 | else |
| 1788 | gold_assert(this->entsize_ == v); |
| 1789 | } |
| 1790 | |
| 1791 | // Add the input section SHNDX, with header SHDR, named SECNAME, in |
| 1792 | // OBJECT, to the Output_section. RELOC_SHNDX is the index of a |
| 1793 | // relocation section which applies to this section, or 0 if none, or |
| 1794 | // -1U if more than one. Return the offset of the input section |
| 1795 | // within the output section. Return -1 if the input section will |
| 1796 | // receive special handling. In the normal case we don't always keep |
| 1797 | // track of input sections for an Output_section. Instead, each |
| 1798 | // Object keeps track of the Output_section for each of its input |
| 1799 | // sections. However, if HAVE_SECTIONS_SCRIPT is true, we do keep |
| 1800 | // track of input sections here; this is used when SECTIONS appears in |
| 1801 | // a linker script. |
| 1802 | |
| 1803 | template<int size, bool big_endian> |
| 1804 | off_t |
| 1805 | Output_section::add_input_section(Sized_relobj<size, big_endian>* object, |
| 1806 | unsigned int shndx, |
| 1807 | const char* secname, |
| 1808 | const elfcpp::Shdr<size, big_endian>& shdr, |
| 1809 | unsigned int reloc_shndx, |
| 1810 | bool have_sections_script) |
| 1811 | { |
| 1812 | elfcpp::Elf_Xword addralign = shdr.get_sh_addralign(); |
| 1813 | if ((addralign & (addralign - 1)) != 0) |
| 1814 | { |
| 1815 | object->error(_("invalid alignment %lu for section \"%s\""), |
| 1816 | static_cast<unsigned long>(addralign), secname); |
| 1817 | addralign = 1; |
| 1818 | } |
| 1819 | |
| 1820 | if (addralign > this->addralign_) |
| 1821 | this->addralign_ = addralign; |
| 1822 | |
| 1823 | typename elfcpp::Elf_types<size>::Elf_WXword sh_flags = shdr.get_sh_flags(); |
| 1824 | this->update_flags_for_input_section(sh_flags); |
| 1825 | |
| 1826 | uint64_t entsize = shdr.get_sh_entsize(); |
| 1827 | |
| 1828 | // .debug_str is a mergeable string section, but is not always so |
| 1829 | // marked by compilers. Mark manually here so we can optimize. |
| 1830 | if (strcmp(secname, ".debug_str") == 0) |
| 1831 | { |
| 1832 | sh_flags |= (elfcpp::SHF_MERGE | elfcpp::SHF_STRINGS); |
| 1833 | entsize = 1; |
| 1834 | } |
| 1835 | |
| 1836 | // If this is a SHF_MERGE section, we pass all the input sections to |
| 1837 | // a Output_data_merge. We don't try to handle relocations for such |
| 1838 | // a section. We don't try to handle empty merge sections--they |
| 1839 | // mess up the mappings, and are useless anyhow. |
| 1840 | if ((sh_flags & elfcpp::SHF_MERGE) != 0 |
| 1841 | && reloc_shndx == 0 |
| 1842 | && shdr.get_sh_size() > 0) |
| 1843 | { |
| 1844 | if (this->add_merge_input_section(object, shndx, sh_flags, |
| 1845 | entsize, addralign)) |
| 1846 | { |
| 1847 | // Tell the relocation routines that they need to call the |
| 1848 | // output_offset method to determine the final address. |
| 1849 | return -1; |
| 1850 | } |
| 1851 | } |
| 1852 | |
| 1853 | off_t offset_in_section = this->current_data_size_for_child(); |
| 1854 | off_t aligned_offset_in_section = align_address(offset_in_section, |
| 1855 | addralign); |
| 1856 | |
| 1857 | if (aligned_offset_in_section > offset_in_section |
| 1858 | && !have_sections_script |
| 1859 | && (sh_flags & elfcpp::SHF_EXECINSTR) != 0 |
| 1860 | && object->target()->has_code_fill()) |
| 1861 | { |
| 1862 | // We need to add some fill data. Using fill_list_ when |
| 1863 | // possible is an optimization, since we will often have fill |
| 1864 | // sections without input sections. |
| 1865 | off_t fill_len = aligned_offset_in_section - offset_in_section; |
| 1866 | if (this->input_sections_.empty()) |
| 1867 | this->fills_.push_back(Fill(offset_in_section, fill_len)); |
| 1868 | else |
| 1869 | { |
| 1870 | // FIXME: When relaxing, the size needs to adjust to |
| 1871 | // maintain a constant alignment. |
| 1872 | std::string fill_data(object->target()->code_fill(fill_len)); |
| 1873 | Output_data_const* odc = new Output_data_const(fill_data, 1); |
| 1874 | this->input_sections_.push_back(Input_section(odc)); |
| 1875 | } |
| 1876 | } |
| 1877 | |
| 1878 | this->set_current_data_size_for_child(aligned_offset_in_section |
| 1879 | + shdr.get_sh_size()); |
| 1880 | |
| 1881 | // We need to keep track of this section if we are already keeping |
| 1882 | // track of sections, or if we are relaxing. Also, if this is a |
| 1883 | // section which requires sorting, or which may require sorting in |
| 1884 | // the future, we keep track of the sections. FIXME: Add test for |
| 1885 | // relaxing. |
| 1886 | if (have_sections_script |
| 1887 | || !this->input_sections_.empty() |
| 1888 | || this->may_sort_attached_input_sections() |
| 1889 | || this->must_sort_attached_input_sections() |
| 1890 | || parameters->options().user_set_Map()) |
| 1891 | this->input_sections_.push_back(Input_section(object, shndx, |
| 1892 | shdr.get_sh_size(), |
| 1893 | addralign)); |
| 1894 | |
| 1895 | return aligned_offset_in_section; |
| 1896 | } |
| 1897 | |
| 1898 | // Add arbitrary data to an output section. |
| 1899 | |
| 1900 | void |
| 1901 | Output_section::add_output_section_data(Output_section_data* posd) |
| 1902 | { |
| 1903 | Input_section inp(posd); |
| 1904 | this->add_output_section_data(&inp); |
| 1905 | |
| 1906 | if (posd->is_data_size_valid()) |
| 1907 | { |
| 1908 | off_t offset_in_section = this->current_data_size_for_child(); |
| 1909 | off_t aligned_offset_in_section = align_address(offset_in_section, |
| 1910 | posd->addralign()); |
| 1911 | this->set_current_data_size_for_child(aligned_offset_in_section |
| 1912 | + posd->data_size()); |
| 1913 | } |
| 1914 | } |
| 1915 | |
| 1916 | // Add arbitrary data to an output section by Input_section. |
| 1917 | |
| 1918 | void |
| 1919 | Output_section::add_output_section_data(Input_section* inp) |
| 1920 | { |
| 1921 | if (this->input_sections_.empty()) |
| 1922 | this->first_input_offset_ = this->current_data_size_for_child(); |
| 1923 | |
| 1924 | this->input_sections_.push_back(*inp); |
| 1925 | |
| 1926 | uint64_t addralign = inp->addralign(); |
| 1927 | if (addralign > this->addralign_) |
| 1928 | this->addralign_ = addralign; |
| 1929 | |
| 1930 | inp->set_output_section(this); |
| 1931 | } |
| 1932 | |
| 1933 | // Add a merge section to an output section. |
| 1934 | |
| 1935 | void |
| 1936 | Output_section::add_output_merge_section(Output_section_data* posd, |
| 1937 | bool is_string, uint64_t entsize) |
| 1938 | { |
| 1939 | Input_section inp(posd, is_string, entsize); |
| 1940 | this->add_output_section_data(&inp); |
| 1941 | } |
| 1942 | |
| 1943 | // Add an input section to a SHF_MERGE section. |
| 1944 | |
| 1945 | bool |
| 1946 | Output_section::add_merge_input_section(Relobj* object, unsigned int shndx, |
| 1947 | uint64_t flags, uint64_t entsize, |
| 1948 | uint64_t addralign) |
| 1949 | { |
| 1950 | bool is_string = (flags & elfcpp::SHF_STRINGS) != 0; |
| 1951 | |
| 1952 | // We only merge strings if the alignment is not more than the |
| 1953 | // character size. This could be handled, but it's unusual. |
| 1954 | if (is_string && addralign > entsize) |
| 1955 | return false; |
| 1956 | |
| 1957 | Input_section_list::iterator p; |
| 1958 | for (p = this->input_sections_.begin(); |
| 1959 | p != this->input_sections_.end(); |
| 1960 | ++p) |
| 1961 | if (p->is_merge_section(is_string, entsize, addralign)) |
| 1962 | { |
| 1963 | p->add_input_section(object, shndx); |
| 1964 | return true; |
| 1965 | } |
| 1966 | |
| 1967 | // We handle the actual constant merging in Output_merge_data or |
| 1968 | // Output_merge_string_data. |
| 1969 | Output_section_data* posd; |
| 1970 | if (!is_string) |
| 1971 | posd = new Output_merge_data(entsize, addralign); |
| 1972 | else |
| 1973 | { |
| 1974 | switch (entsize) |
| 1975 | { |
| 1976 | case 1: |
| 1977 | posd = new Output_merge_string<char>(addralign); |
| 1978 | break; |
| 1979 | case 2: |
| 1980 | posd = new Output_merge_string<uint16_t>(addralign); |
| 1981 | break; |
| 1982 | case 4: |
| 1983 | posd = new Output_merge_string<uint32_t>(addralign); |
| 1984 | break; |
| 1985 | default: |
| 1986 | return false; |
| 1987 | } |
| 1988 | } |
| 1989 | |
| 1990 | this->add_output_merge_section(posd, is_string, entsize); |
| 1991 | posd->add_input_section(object, shndx); |
| 1992 | |
| 1993 | return true; |
| 1994 | } |
| 1995 | |
| 1996 | // Given an address OFFSET relative to the start of input section |
| 1997 | // SHNDX in OBJECT, return whether this address is being included in |
| 1998 | // the final link. This should only be called if SHNDX in OBJECT has |
| 1999 | // a special mapping. |
| 2000 | |
| 2001 | bool |
| 2002 | Output_section::is_input_address_mapped(const Relobj* object, |
| 2003 | unsigned int shndx, |
| 2004 | off_t offset) const |
| 2005 | { |
| 2006 | for (Input_section_list::const_iterator p = this->input_sections_.begin(); |
| 2007 | p != this->input_sections_.end(); |
| 2008 | ++p) |
| 2009 | { |
| 2010 | section_offset_type output_offset; |
| 2011 | if (p->output_offset(object, shndx, offset, &output_offset)) |
| 2012 | return output_offset != -1; |
| 2013 | } |
| 2014 | |
| 2015 | // By default we assume that the address is mapped. This should |
| 2016 | // only be called after we have passed all sections to Layout. At |
| 2017 | // that point we should know what we are discarding. |
| 2018 | return true; |
| 2019 | } |
| 2020 | |
| 2021 | // Given an address OFFSET relative to the start of input section |
| 2022 | // SHNDX in object OBJECT, return the output offset relative to the |
| 2023 | // start of the input section in the output section. This should only |
| 2024 | // be called if SHNDX in OBJECT has a special mapping. |
| 2025 | |
| 2026 | section_offset_type |
| 2027 | Output_section::output_offset(const Relobj* object, unsigned int shndx, |
| 2028 | section_offset_type offset) const |
| 2029 | { |
| 2030 | // This can only be called meaningfully when layout is complete. |
| 2031 | gold_assert(Output_data::is_layout_complete()); |
| 2032 | |
| 2033 | for (Input_section_list::const_iterator p = this->input_sections_.begin(); |
| 2034 | p != this->input_sections_.end(); |
| 2035 | ++p) |
| 2036 | { |
| 2037 | section_offset_type output_offset; |
| 2038 | if (p->output_offset(object, shndx, offset, &output_offset)) |
| 2039 | return output_offset; |
| 2040 | } |
| 2041 | gold_unreachable(); |
| 2042 | } |
| 2043 | |
| 2044 | // Return the output virtual address of OFFSET relative to the start |
| 2045 | // of input section SHNDX in object OBJECT. |
| 2046 | |
| 2047 | uint64_t |
| 2048 | Output_section::output_address(const Relobj* object, unsigned int shndx, |
| 2049 | off_t offset) const |
| 2050 | { |
| 2051 | uint64_t addr = this->address() + this->first_input_offset_; |
| 2052 | for (Input_section_list::const_iterator p = this->input_sections_.begin(); |
| 2053 | p != this->input_sections_.end(); |
| 2054 | ++p) |
| 2055 | { |
| 2056 | addr = align_address(addr, p->addralign()); |
| 2057 | section_offset_type output_offset; |
| 2058 | if (p->output_offset(object, shndx, offset, &output_offset)) |
| 2059 | { |
| 2060 | if (output_offset == -1) |
| 2061 | return -1ULL; |
| 2062 | return addr + output_offset; |
| 2063 | } |
| 2064 | addr += p->data_size(); |
| 2065 | } |
| 2066 | |
| 2067 | // If we get here, it means that we don't know the mapping for this |
| 2068 | // input section. This might happen in principle if |
| 2069 | // add_input_section were called before add_output_section_data. |
| 2070 | // But it should never actually happen. |
| 2071 | |
| 2072 | gold_unreachable(); |
| 2073 | } |
| 2074 | |
| 2075 | // Find the output address of the start of the merged section for |
| 2076 | // input section SHNDX in object OBJECT. |
| 2077 | |
| 2078 | bool |
| 2079 | Output_section::find_starting_output_address(const Relobj* object, |
| 2080 | unsigned int shndx, |
| 2081 | uint64_t* paddr) const |
| 2082 | { |
| 2083 | uint64_t addr = this->address() + this->first_input_offset_; |
| 2084 | for (Input_section_list::const_iterator p = this->input_sections_.begin(); |
| 2085 | p != this->input_sections_.end(); |
| 2086 | ++p) |
| 2087 | { |
| 2088 | addr = align_address(addr, p->addralign()); |
| 2089 | |
| 2090 | // It would be nice if we could use the existing output_offset |
| 2091 | // method to get the output offset of input offset 0. |
| 2092 | // Unfortunately we don't know for sure that input offset 0 is |
| 2093 | // mapped at all. |
| 2094 | if (p->is_merge_section_for(object, shndx)) |
| 2095 | { |
| 2096 | *paddr = addr; |
| 2097 | return true; |
| 2098 | } |
| 2099 | |
| 2100 | addr += p->data_size(); |
| 2101 | } |
| 2102 | |
| 2103 | // We couldn't find a merge output section for this input section. |
| 2104 | return false; |
| 2105 | } |
| 2106 | |
| 2107 | // Set the data size of an Output_section. This is where we handle |
| 2108 | // setting the addresses of any Output_section_data objects. |
| 2109 | |
| 2110 | void |
| 2111 | Output_section::set_final_data_size() |
| 2112 | { |
| 2113 | if (this->input_sections_.empty()) |
| 2114 | { |
| 2115 | this->set_data_size(this->current_data_size_for_child()); |
| 2116 | return; |
| 2117 | } |
| 2118 | |
| 2119 | if (this->must_sort_attached_input_sections()) |
| 2120 | this->sort_attached_input_sections(); |
| 2121 | |
| 2122 | uint64_t address = this->address(); |
| 2123 | off_t startoff = this->offset(); |
| 2124 | off_t off = startoff + this->first_input_offset_; |
| 2125 | for (Input_section_list::iterator p = this->input_sections_.begin(); |
| 2126 | p != this->input_sections_.end(); |
| 2127 | ++p) |
| 2128 | { |
| 2129 | off = align_address(off, p->addralign()); |
| 2130 | p->set_address_and_file_offset(address + (off - startoff), off, |
| 2131 | startoff); |
| 2132 | off += p->data_size(); |
| 2133 | } |
| 2134 | |
| 2135 | this->set_data_size(off - startoff); |
| 2136 | } |
| 2137 | |
| 2138 | // Reset the address and file offset. |
| 2139 | |
| 2140 | void |
| 2141 | Output_section::do_reset_address_and_file_offset() |
| 2142 | { |
| 2143 | for (Input_section_list::iterator p = this->input_sections_.begin(); |
| 2144 | p != this->input_sections_.end(); |
| 2145 | ++p) |
| 2146 | p->reset_address_and_file_offset(); |
| 2147 | } |
| 2148 | |
| 2149 | // Set the TLS offset. Called only for SHT_TLS sections. |
| 2150 | |
| 2151 | void |
| 2152 | Output_section::do_set_tls_offset(uint64_t tls_base) |
| 2153 | { |
| 2154 | this->tls_offset_ = this->address() - tls_base; |
| 2155 | } |
| 2156 | |
| 2157 | // In a few cases we need to sort the input sections attached to an |
| 2158 | // output section. This is used to implement the type of constructor |
| 2159 | // priority ordering implemented by the GNU linker, in which the |
| 2160 | // priority becomes part of the section name and the sections are |
| 2161 | // sorted by name. We only do this for an output section if we see an |
| 2162 | // attached input section matching ".ctor.*", ".dtor.*", |
| 2163 | // ".init_array.*" or ".fini_array.*". |
| 2164 | |
| 2165 | class Output_section::Input_section_sort_entry |
| 2166 | { |
| 2167 | public: |
| 2168 | Input_section_sort_entry() |
| 2169 | : input_section_(), index_(-1U), section_has_name_(false), |
| 2170 | section_name_() |
| 2171 | { } |
| 2172 | |
| 2173 | Input_section_sort_entry(const Input_section& input_section, |
| 2174 | unsigned int index) |
| 2175 | : input_section_(input_section), index_(index), |
| 2176 | section_has_name_(input_section.is_input_section()) |
| 2177 | { |
| 2178 | if (this->section_has_name_) |
| 2179 | { |
| 2180 | // This is only called single-threaded from Layout::finalize, |
| 2181 | // so it is OK to lock. Unfortunately we have no way to pass |
| 2182 | // in a Task token. |
| 2183 | const Task* dummy_task = reinterpret_cast<const Task*>(-1); |
| 2184 | Object* obj = input_section.relobj(); |
| 2185 | Task_lock_obj<Object> tl(dummy_task, obj); |
| 2186 | |
| 2187 | // This is a slow operation, which should be cached in |
| 2188 | // Layout::layout if this becomes a speed problem. |
| 2189 | this->section_name_ = obj->section_name(input_section.shndx()); |
| 2190 | } |
| 2191 | } |
| 2192 | |
| 2193 | // Return the Input_section. |
| 2194 | const Input_section& |
| 2195 | input_section() const |
| 2196 | { |
| 2197 | gold_assert(this->index_ != -1U); |
| 2198 | return this->input_section_; |
| 2199 | } |
| 2200 | |
| 2201 | // The index of this entry in the original list. This is used to |
| 2202 | // make the sort stable. |
| 2203 | unsigned int |
| 2204 | index() const |
| 2205 | { |
| 2206 | gold_assert(this->index_ != -1U); |
| 2207 | return this->index_; |
| 2208 | } |
| 2209 | |
| 2210 | // Whether there is a section name. |
| 2211 | bool |
| 2212 | section_has_name() const |
| 2213 | { return this->section_has_name_; } |
| 2214 | |
| 2215 | // The section name. |
| 2216 | const std::string& |
| 2217 | section_name() const |
| 2218 | { |
| 2219 | gold_assert(this->section_has_name_); |
| 2220 | return this->section_name_; |
| 2221 | } |
| 2222 | |
| 2223 | // Return true if the section name has a priority. This is assumed |
| 2224 | // to be true if it has a dot after the initial dot. |
| 2225 | bool |
| 2226 | has_priority() const |
| 2227 | { |
| 2228 | gold_assert(this->section_has_name_); |
| 2229 | return this->section_name_.find('.', 1); |
| 2230 | } |
| 2231 | |
| 2232 | // Return true if this an input file whose base name matches |
| 2233 | // FILE_NAME. The base name must have an extension of ".o", and |
| 2234 | // must be exactly FILE_NAME.o or FILE_NAME, one character, ".o". |
| 2235 | // This is to match crtbegin.o as well as crtbeginS.o without |
| 2236 | // getting confused by other possibilities. Overall matching the |
| 2237 | // file name this way is a dreadful hack, but the GNU linker does it |
| 2238 | // in order to better support gcc, and we need to be compatible. |
| 2239 | bool |
| 2240 | match_file_name(const char* match_file_name) const |
| 2241 | { |
| 2242 | const std::string& file_name(this->input_section_.relobj()->name()); |
| 2243 | const char* base_name = lbasename(file_name.c_str()); |
| 2244 | size_t match_len = strlen(match_file_name); |
| 2245 | if (strncmp(base_name, match_file_name, match_len) != 0) |
| 2246 | return false; |
| 2247 | size_t base_len = strlen(base_name); |
| 2248 | if (base_len != match_len + 2 && base_len != match_len + 3) |
| 2249 | return false; |
| 2250 | return memcmp(base_name + base_len - 2, ".o", 2) == 0; |
| 2251 | } |
| 2252 | |
| 2253 | private: |
| 2254 | // The Input_section we are sorting. |
| 2255 | Input_section input_section_; |
| 2256 | // The index of this Input_section in the original list. |
| 2257 | unsigned int index_; |
| 2258 | // Whether this Input_section has a section name--it won't if this |
| 2259 | // is some random Output_section_data. |
| 2260 | bool section_has_name_; |
| 2261 | // The section name if there is one. |
| 2262 | std::string section_name_; |
| 2263 | }; |
| 2264 | |
| 2265 | // Return true if S1 should come before S2 in the output section. |
| 2266 | |
| 2267 | bool |
| 2268 | Output_section::Input_section_sort_compare::operator()( |
| 2269 | const Output_section::Input_section_sort_entry& s1, |
| 2270 | const Output_section::Input_section_sort_entry& s2) const |
| 2271 | { |
| 2272 | // crtbegin.o must come first. |
| 2273 | bool s1_begin = s1.match_file_name("crtbegin"); |
| 2274 | bool s2_begin = s2.match_file_name("crtbegin"); |
| 2275 | if (s1_begin || s2_begin) |
| 2276 | { |
| 2277 | if (!s1_begin) |
| 2278 | return false; |
| 2279 | if (!s2_begin) |
| 2280 | return true; |
| 2281 | return s1.index() < s2.index(); |
| 2282 | } |
| 2283 | |
| 2284 | // crtend.o must come last. |
| 2285 | bool s1_end = s1.match_file_name("crtend"); |
| 2286 | bool s2_end = s2.match_file_name("crtend"); |
| 2287 | if (s1_end || s2_end) |
| 2288 | { |
| 2289 | if (!s1_end) |
| 2290 | return true; |
| 2291 | if (!s2_end) |
| 2292 | return false; |
| 2293 | return s1.index() < s2.index(); |
| 2294 | } |
| 2295 | |
| 2296 | // We sort all the sections with no names to the end. |
| 2297 | if (!s1.section_has_name() || !s2.section_has_name()) |
| 2298 | { |
| 2299 | if (s1.section_has_name()) |
| 2300 | return true; |
| 2301 | if (s2.section_has_name()) |
| 2302 | return false; |
| 2303 | return s1.index() < s2.index(); |
| 2304 | } |
| 2305 | |
| 2306 | // A section with a priority follows a section without a priority. |
| 2307 | // The GNU linker does this for all but .init_array sections; until |
| 2308 | // further notice we'll assume that that is an mistake. |
| 2309 | bool s1_has_priority = s1.has_priority(); |
| 2310 | bool s2_has_priority = s2.has_priority(); |
| 2311 | if (s1_has_priority && !s2_has_priority) |
| 2312 | return false; |
| 2313 | if (!s1_has_priority && s2_has_priority) |
| 2314 | return true; |
| 2315 | |
| 2316 | // Otherwise we sort by name. |
| 2317 | int compare = s1.section_name().compare(s2.section_name()); |
| 2318 | if (compare != 0) |
| 2319 | return compare < 0; |
| 2320 | |
| 2321 | // Otherwise we keep the input order. |
| 2322 | return s1.index() < s2.index(); |
| 2323 | } |
| 2324 | |
| 2325 | // Sort the input sections attached to an output section. |
| 2326 | |
| 2327 | void |
| 2328 | Output_section::sort_attached_input_sections() |
| 2329 | { |
| 2330 | if (this->attached_input_sections_are_sorted_) |
| 2331 | return; |
| 2332 | |
| 2333 | // The only thing we know about an input section is the object and |
| 2334 | // the section index. We need the section name. Recomputing this |
| 2335 | // is slow but this is an unusual case. If this becomes a speed |
| 2336 | // problem we can cache the names as required in Layout::layout. |
| 2337 | |
| 2338 | // We start by building a larger vector holding a copy of each |
| 2339 | // Input_section, plus its current index in the list and its name. |
| 2340 | std::vector<Input_section_sort_entry> sort_list; |
| 2341 | |
| 2342 | unsigned int i = 0; |
| 2343 | for (Input_section_list::iterator p = this->input_sections_.begin(); |
| 2344 | p != this->input_sections_.end(); |
| 2345 | ++p, ++i) |
| 2346 | sort_list.push_back(Input_section_sort_entry(*p, i)); |
| 2347 | |
| 2348 | // Sort the input sections. |
| 2349 | std::sort(sort_list.begin(), sort_list.end(), Input_section_sort_compare()); |
| 2350 | |
| 2351 | // Copy the sorted input sections back to our list. |
| 2352 | this->input_sections_.clear(); |
| 2353 | for (std::vector<Input_section_sort_entry>::iterator p = sort_list.begin(); |
| 2354 | p != sort_list.end(); |
| 2355 | ++p) |
| 2356 | this->input_sections_.push_back(p->input_section()); |
| 2357 | |
| 2358 | // Remember that we sorted the input sections, since we might get |
| 2359 | // called again. |
| 2360 | this->attached_input_sections_are_sorted_ = true; |
| 2361 | } |
| 2362 | |
| 2363 | // Write the section header to *OSHDR. |
| 2364 | |
| 2365 | template<int size, bool big_endian> |
| 2366 | void |
| 2367 | Output_section::write_header(const Layout* layout, |
| 2368 | const Stringpool* secnamepool, |
| 2369 | elfcpp::Shdr_write<size, big_endian>* oshdr) const |
| 2370 | { |
| 2371 | oshdr->put_sh_name(secnamepool->get_offset(this->name_)); |
| 2372 | oshdr->put_sh_type(this->type_); |
| 2373 | |
| 2374 | elfcpp::Elf_Xword flags = this->flags_; |
| 2375 | if (this->info_section_ != NULL && this->info_uses_section_index_) |
| 2376 | flags |= elfcpp::SHF_INFO_LINK; |
| 2377 | oshdr->put_sh_flags(flags); |
| 2378 | |
| 2379 | oshdr->put_sh_addr(this->address()); |
| 2380 | oshdr->put_sh_offset(this->offset()); |
| 2381 | oshdr->put_sh_size(this->data_size()); |
| 2382 | if (this->link_section_ != NULL) |
| 2383 | oshdr->put_sh_link(this->link_section_->out_shndx()); |
| 2384 | else if (this->should_link_to_symtab_) |
| 2385 | oshdr->put_sh_link(layout->symtab_section()->out_shndx()); |
| 2386 | else if (this->should_link_to_dynsym_) |
| 2387 | oshdr->put_sh_link(layout->dynsym_section()->out_shndx()); |
| 2388 | else |
| 2389 | oshdr->put_sh_link(this->link_); |
| 2390 | |
| 2391 | elfcpp::Elf_Word info; |
| 2392 | if (this->info_section_ != NULL) |
| 2393 | { |
| 2394 | if (this->info_uses_section_index_) |
| 2395 | info = this->info_section_->out_shndx(); |
| 2396 | else |
| 2397 | info = this->info_section_->symtab_index(); |
| 2398 | } |
| 2399 | else if (this->info_symndx_ != NULL) |
| 2400 | info = this->info_symndx_->symtab_index(); |
| 2401 | else |
| 2402 | info = this->info_; |
| 2403 | oshdr->put_sh_info(info); |
| 2404 | |
| 2405 | oshdr->put_sh_addralign(this->addralign_); |
| 2406 | oshdr->put_sh_entsize(this->entsize_); |
| 2407 | } |
| 2408 | |
| 2409 | // Write out the data. For input sections the data is written out by |
| 2410 | // Object::relocate, but we have to handle Output_section_data objects |
| 2411 | // here. |
| 2412 | |
| 2413 | void |
| 2414 | Output_section::do_write(Output_file* of) |
| 2415 | { |
| 2416 | gold_assert(!this->requires_postprocessing()); |
| 2417 | |
| 2418 | off_t output_section_file_offset = this->offset(); |
| 2419 | for (Fill_list::iterator p = this->fills_.begin(); |
| 2420 | p != this->fills_.end(); |
| 2421 | ++p) |
| 2422 | { |
| 2423 | std::string fill_data(parameters->target().code_fill(p->length())); |
| 2424 | of->write(output_section_file_offset + p->section_offset(), |
| 2425 | fill_data.data(), fill_data.size()); |
| 2426 | } |
| 2427 | |
| 2428 | for (Input_section_list::iterator p = this->input_sections_.begin(); |
| 2429 | p != this->input_sections_.end(); |
| 2430 | ++p) |
| 2431 | p->write(of); |
| 2432 | } |
| 2433 | |
| 2434 | // If a section requires postprocessing, create the buffer to use. |
| 2435 | |
| 2436 | void |
| 2437 | Output_section::create_postprocessing_buffer() |
| 2438 | { |
| 2439 | gold_assert(this->requires_postprocessing()); |
| 2440 | |
| 2441 | if (this->postprocessing_buffer_ != NULL) |
| 2442 | return; |
| 2443 | |
| 2444 | if (!this->input_sections_.empty()) |
| 2445 | { |
| 2446 | off_t off = this->first_input_offset_; |
| 2447 | for (Input_section_list::iterator p = this->input_sections_.begin(); |
| 2448 | p != this->input_sections_.end(); |
| 2449 | ++p) |
| 2450 | { |
| 2451 | off = align_address(off, p->addralign()); |
| 2452 | p->finalize_data_size(); |
| 2453 | off += p->data_size(); |
| 2454 | } |
| 2455 | this->set_current_data_size_for_child(off); |
| 2456 | } |
| 2457 | |
| 2458 | off_t buffer_size = this->current_data_size_for_child(); |
| 2459 | this->postprocessing_buffer_ = new unsigned char[buffer_size]; |
| 2460 | } |
| 2461 | |
| 2462 | // Write all the data of an Output_section into the postprocessing |
| 2463 | // buffer. This is used for sections which require postprocessing, |
| 2464 | // such as compression. Input sections are handled by |
| 2465 | // Object::Relocate. |
| 2466 | |
| 2467 | void |
| 2468 | Output_section::write_to_postprocessing_buffer() |
| 2469 | { |
| 2470 | gold_assert(this->requires_postprocessing()); |
| 2471 | |
| 2472 | unsigned char* buffer = this->postprocessing_buffer(); |
| 2473 | for (Fill_list::iterator p = this->fills_.begin(); |
| 2474 | p != this->fills_.end(); |
| 2475 | ++p) |
| 2476 | { |
| 2477 | std::string fill_data(parameters->target().code_fill(p->length())); |
| 2478 | memcpy(buffer + p->section_offset(), fill_data.data(), |
| 2479 | fill_data.size()); |
| 2480 | } |
| 2481 | |
| 2482 | off_t off = this->first_input_offset_; |
| 2483 | for (Input_section_list::iterator p = this->input_sections_.begin(); |
| 2484 | p != this->input_sections_.end(); |
| 2485 | ++p) |
| 2486 | { |
| 2487 | off = align_address(off, p->addralign()); |
| 2488 | p->write_to_buffer(buffer + off); |
| 2489 | off += p->data_size(); |
| 2490 | } |
| 2491 | } |
| 2492 | |
| 2493 | // Get the input sections for linker script processing. We leave |
| 2494 | // behind the Output_section_data entries. Note that this may be |
| 2495 | // slightly incorrect for merge sections. We will leave them behind, |
| 2496 | // but it is possible that the script says that they should follow |
| 2497 | // some other input sections, as in: |
| 2498 | // .rodata { *(.rodata) *(.rodata.cst*) } |
| 2499 | // For that matter, we don't handle this correctly: |
| 2500 | // .rodata { foo.o(.rodata.cst*) *(.rodata.cst*) } |
| 2501 | // With luck this will never matter. |
| 2502 | |
| 2503 | uint64_t |
| 2504 | Output_section::get_input_sections( |
| 2505 | uint64_t address, |
| 2506 | const std::string& fill, |
| 2507 | std::list<std::pair<Relobj*, unsigned int> >* input_sections) |
| 2508 | { |
| 2509 | uint64_t orig_address = address; |
| 2510 | |
| 2511 | address = align_address(address, this->addralign()); |
| 2512 | |
| 2513 | Input_section_list remaining; |
| 2514 | for (Input_section_list::iterator p = this->input_sections_.begin(); |
| 2515 | p != this->input_sections_.end(); |
| 2516 | ++p) |
| 2517 | { |
| 2518 | if (p->is_input_section()) |
| 2519 | input_sections->push_back(std::make_pair(p->relobj(), p->shndx())); |
| 2520 | else |
| 2521 | { |
| 2522 | uint64_t aligned_address = align_address(address, p->addralign()); |
| 2523 | if (aligned_address != address && !fill.empty()) |
| 2524 | { |
| 2525 | section_size_type length = |
| 2526 | convert_to_section_size_type(aligned_address - address); |
| 2527 | std::string this_fill; |
| 2528 | this_fill.reserve(length); |
| 2529 | while (this_fill.length() + fill.length() <= length) |
| 2530 | this_fill += fill; |
| 2531 | if (this_fill.length() < length) |
| 2532 | this_fill.append(fill, 0, length - this_fill.length()); |
| 2533 | |
| 2534 | Output_section_data* posd = new Output_data_const(this_fill, 0); |
| 2535 | remaining.push_back(Input_section(posd)); |
| 2536 | } |
| 2537 | address = aligned_address; |
| 2538 | |
| 2539 | remaining.push_back(*p); |
| 2540 | |
| 2541 | p->finalize_data_size(); |
| 2542 | address += p->data_size(); |
| 2543 | } |
| 2544 | } |
| 2545 | |
| 2546 | this->input_sections_.swap(remaining); |
| 2547 | this->first_input_offset_ = 0; |
| 2548 | |
| 2549 | uint64_t data_size = address - orig_address; |
| 2550 | this->set_current_data_size_for_child(data_size); |
| 2551 | return data_size; |
| 2552 | } |
| 2553 | |
| 2554 | // Add an input section from a script. |
| 2555 | |
| 2556 | void |
| 2557 | Output_section::add_input_section_for_script(Relobj* object, |
| 2558 | unsigned int shndx, |
| 2559 | off_t data_size, |
| 2560 | uint64_t addralign) |
| 2561 | { |
| 2562 | if (addralign > this->addralign_) |
| 2563 | this->addralign_ = addralign; |
| 2564 | |
| 2565 | off_t offset_in_section = this->current_data_size_for_child(); |
| 2566 | off_t aligned_offset_in_section = align_address(offset_in_section, |
| 2567 | addralign); |
| 2568 | |
| 2569 | this->set_current_data_size_for_child(aligned_offset_in_section |
| 2570 | + data_size); |
| 2571 | |
| 2572 | this->input_sections_.push_back(Input_section(object, shndx, |
| 2573 | data_size, addralign)); |
| 2574 | } |
| 2575 | |
| 2576 | // Print to the map file. |
| 2577 | |
| 2578 | void |
| 2579 | Output_section::do_print_to_mapfile(Mapfile* mapfile) const |
| 2580 | { |
| 2581 | mapfile->print_output_section(this); |
| 2582 | |
| 2583 | for (Input_section_list::const_iterator p = this->input_sections_.begin(); |
| 2584 | p != this->input_sections_.end(); |
| 2585 | ++p) |
| 2586 | p->print_to_mapfile(mapfile); |
| 2587 | } |
| 2588 | |
| 2589 | // Print stats for merge sections to stderr. |
| 2590 | |
| 2591 | void |
| 2592 | Output_section::print_merge_stats() |
| 2593 | { |
| 2594 | Input_section_list::iterator p; |
| 2595 | for (p = this->input_sections_.begin(); |
| 2596 | p != this->input_sections_.end(); |
| 2597 | ++p) |
| 2598 | p->print_merge_stats(this->name_); |
| 2599 | } |
| 2600 | |
| 2601 | // Output segment methods. |
| 2602 | |
| 2603 | Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) |
| 2604 | : output_data_(), |
| 2605 | output_bss_(), |
| 2606 | vaddr_(0), |
| 2607 | paddr_(0), |
| 2608 | memsz_(0), |
| 2609 | max_align_(0), |
| 2610 | min_p_align_(0), |
| 2611 | offset_(0), |
| 2612 | filesz_(0), |
| 2613 | type_(type), |
| 2614 | flags_(flags), |
| 2615 | is_max_align_known_(false), |
| 2616 | are_addresses_set_(false) |
| 2617 | { |
| 2618 | } |
| 2619 | |
| 2620 | // Add an Output_section to an Output_segment. |
| 2621 | |
| 2622 | void |
| 2623 | Output_segment::add_output_section(Output_section* os, |
| 2624 | elfcpp::Elf_Word seg_flags) |
| 2625 | { |
| 2626 | gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0); |
| 2627 | gold_assert(!this->is_max_align_known_); |
| 2628 | |
| 2629 | // Update the segment flags. |
| 2630 | this->flags_ |= seg_flags; |
| 2631 | |
| 2632 | Output_segment::Output_data_list* pdl; |
| 2633 | if (os->type() == elfcpp::SHT_NOBITS) |
| 2634 | pdl = &this->output_bss_; |
| 2635 | else |
| 2636 | pdl = &this->output_data_; |
| 2637 | |
| 2638 | // So that PT_NOTE segments will work correctly, we need to ensure |
| 2639 | // that all SHT_NOTE sections are adjacent. This will normally |
| 2640 | // happen automatically, because all the SHT_NOTE input sections |
| 2641 | // will wind up in the same output section. However, it is possible |
| 2642 | // for multiple SHT_NOTE input sections to have different section |
| 2643 | // flags, and thus be in different output sections, but for the |
| 2644 | // different section flags to map into the same segment flags and |
| 2645 | // thus the same output segment. |
| 2646 | |
| 2647 | // Note that while there may be many input sections in an output |
| 2648 | // section, there are normally only a few output sections in an |
| 2649 | // output segment. This loop is expected to be fast. |
| 2650 | |
| 2651 | if (os->type() == elfcpp::SHT_NOTE && !pdl->empty()) |
| 2652 | { |
| 2653 | Output_segment::Output_data_list::iterator p = pdl->end(); |
| 2654 | do |
| 2655 | { |
| 2656 | --p; |
| 2657 | if ((*p)->is_section_type(elfcpp::SHT_NOTE)) |
| 2658 | { |
| 2659 | ++p; |
| 2660 | pdl->insert(p, os); |
| 2661 | return; |
| 2662 | } |
| 2663 | } |
| 2664 | while (p != pdl->begin()); |
| 2665 | } |
| 2666 | |
| 2667 | // Similarly, so that PT_TLS segments will work, we need to group |
| 2668 | // SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special |
| 2669 | // case: we group the SHF_TLS/SHT_NOBITS sections right after the |
| 2670 | // SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS |
| 2671 | // correctly. SHF_TLS sections get added to both a PT_LOAD segment |
| 2672 | // and the PT_TLS segment -- we do this grouping only for the |
| 2673 | // PT_LOAD segment. |
| 2674 | if (this->type_ != elfcpp::PT_TLS |
| 2675 | && (os->flags() & elfcpp::SHF_TLS) != 0) |
| 2676 | { |
| 2677 | pdl = &this->output_data_; |
| 2678 | bool nobits = os->type() == elfcpp::SHT_NOBITS; |
| 2679 | bool sawtls = false; |
| 2680 | Output_segment::Output_data_list::iterator p = pdl->end(); |
| 2681 | do |
| 2682 | { |
| 2683 | --p; |
| 2684 | bool insert; |
| 2685 | if ((*p)->is_section_flag_set(elfcpp::SHF_TLS)) |
| 2686 | { |
| 2687 | sawtls = true; |
| 2688 | // Put a NOBITS section after the first TLS section. |
| 2689 | // Put a PROGBITS section after the first TLS/PROGBITS |
| 2690 | // section. |
| 2691 | insert = nobits || !(*p)->is_section_type(elfcpp::SHT_NOBITS); |
| 2692 | } |
| 2693 | else |
| 2694 | { |
| 2695 | // If we've gone past the TLS sections, but we've seen a |
| 2696 | // TLS section, then we need to insert this section now. |
| 2697 | insert = sawtls; |
| 2698 | } |
| 2699 | |
| 2700 | if (insert) |
| 2701 | { |
| 2702 | ++p; |
| 2703 | pdl->insert(p, os); |
| 2704 | return; |
| 2705 | } |
| 2706 | } |
| 2707 | while (p != pdl->begin()); |
| 2708 | |
| 2709 | // There are no TLS sections yet; put this one at the requested |
| 2710 | // location in the section list. |
| 2711 | } |
| 2712 | |
| 2713 | // For the PT_GNU_RELRO segment, we need to group relro sections, |
| 2714 | // and we need to put them before any non-relro sections. Also, |
| 2715 | // relro local sections go before relro non-local sections. |
| 2716 | if (parameters->options().relro() && os->is_relro()) |
| 2717 | { |
| 2718 | gold_assert(pdl == &this->output_data_); |
| 2719 | Output_segment::Output_data_list::iterator p; |
| 2720 | for (p = pdl->begin(); p != pdl->end(); ++p) |
| 2721 | { |
| 2722 | if (!(*p)->is_section()) |
| 2723 | break; |
| 2724 | |
| 2725 | Output_section* pos = (*p)->output_section(); |
| 2726 | if (!pos->is_relro() |
| 2727 | || (os->is_relro_local() && !pos->is_relro_local())) |
| 2728 | break; |
| 2729 | } |
| 2730 | |
| 2731 | pdl->insert(p, os); |
| 2732 | return; |
| 2733 | } |
| 2734 | |
| 2735 | pdl->push_back(os); |
| 2736 | } |
| 2737 | |
| 2738 | // Remove an Output_section from this segment. It is an error if it |
| 2739 | // is not present. |
| 2740 | |
| 2741 | void |
| 2742 | Output_segment::remove_output_section(Output_section* os) |
| 2743 | { |
| 2744 | // We only need this for SHT_PROGBITS. |
| 2745 | gold_assert(os->type() == elfcpp::SHT_PROGBITS); |
| 2746 | for (Output_data_list::iterator p = this->output_data_.begin(); |
| 2747 | p != this->output_data_.end(); |
| 2748 | ++p) |
| 2749 | { |
| 2750 | if (*p == os) |
| 2751 | { |
| 2752 | this->output_data_.erase(p); |
| 2753 | return; |
| 2754 | } |
| 2755 | } |
| 2756 | gold_unreachable(); |
| 2757 | } |
| 2758 | |
| 2759 | // Add an Output_data (which is not an Output_section) to the start of |
| 2760 | // a segment. |
| 2761 | |
| 2762 | void |
| 2763 | Output_segment::add_initial_output_data(Output_data* od) |
| 2764 | { |
| 2765 | gold_assert(!this->is_max_align_known_); |
| 2766 | this->output_data_.push_front(od); |
| 2767 | } |
| 2768 | |
| 2769 | // Return whether the first data section is a relro section. |
| 2770 | |
| 2771 | bool |
| 2772 | Output_segment::is_first_section_relro() const |
| 2773 | { |
| 2774 | return (!this->output_data_.empty() |
| 2775 | && this->output_data_.front()->is_section() |
| 2776 | && this->output_data_.front()->output_section()->is_relro()); |
| 2777 | } |
| 2778 | |
| 2779 | // Return the maximum alignment of the Output_data in Output_segment. |
| 2780 | |
| 2781 | uint64_t |
| 2782 | Output_segment::maximum_alignment() |
| 2783 | { |
| 2784 | if (!this->is_max_align_known_) |
| 2785 | { |
| 2786 | uint64_t addralign; |
| 2787 | |
| 2788 | addralign = Output_segment::maximum_alignment_list(&this->output_data_); |
| 2789 | if (addralign > this->max_align_) |
| 2790 | this->max_align_ = addralign; |
| 2791 | |
| 2792 | addralign = Output_segment::maximum_alignment_list(&this->output_bss_); |
| 2793 | if (addralign > this->max_align_) |
| 2794 | this->max_align_ = addralign; |
| 2795 | |
| 2796 | // If -z relro is in effect, and the first section in this |
| 2797 | // segment is a relro section, then the segment must be aligned |
| 2798 | // to at least the common page size. This ensures that the |
| 2799 | // PT_GNU_RELRO segment will start at a page boundary. |
| 2800 | if (this->type_ == elfcpp::PT_LOAD |
| 2801 | && parameters->options().relro() |
| 2802 | && this->is_first_section_relro()) |
| 2803 | { |
| 2804 | addralign = parameters->target().common_pagesize(); |
| 2805 | if (addralign > this->max_align_) |
| 2806 | this->max_align_ = addralign; |
| 2807 | } |
| 2808 | |
| 2809 | this->is_max_align_known_ = true; |
| 2810 | } |
| 2811 | |
| 2812 | return this->max_align_; |
| 2813 | } |
| 2814 | |
| 2815 | // Return the maximum alignment of a list of Output_data. |
| 2816 | |
| 2817 | uint64_t |
| 2818 | Output_segment::maximum_alignment_list(const Output_data_list* pdl) |
| 2819 | { |
| 2820 | uint64_t ret = 0; |
| 2821 | for (Output_data_list::const_iterator p = pdl->begin(); |
| 2822 | p != pdl->end(); |
| 2823 | ++p) |
| 2824 | { |
| 2825 | uint64_t addralign = (*p)->addralign(); |
| 2826 | if (addralign > ret) |
| 2827 | ret = addralign; |
| 2828 | } |
| 2829 | return ret; |
| 2830 | } |
| 2831 | |
| 2832 | // Return the number of dynamic relocs applied to this segment. |
| 2833 | |
| 2834 | unsigned int |
| 2835 | Output_segment::dynamic_reloc_count() const |
| 2836 | { |
| 2837 | return (this->dynamic_reloc_count_list(&this->output_data_) |
| 2838 | + this->dynamic_reloc_count_list(&this->output_bss_)); |
| 2839 | } |
| 2840 | |
| 2841 | // Return the number of dynamic relocs applied to an Output_data_list. |
| 2842 | |
| 2843 | unsigned int |
| 2844 | Output_segment::dynamic_reloc_count_list(const Output_data_list* pdl) const |
| 2845 | { |
| 2846 | unsigned int count = 0; |
| 2847 | for (Output_data_list::const_iterator p = pdl->begin(); |
| 2848 | p != pdl->end(); |
| 2849 | ++p) |
| 2850 | count += (*p)->dynamic_reloc_count(); |
| 2851 | return count; |
| 2852 | } |
| 2853 | |
| 2854 | // Set the section addresses for an Output_segment. If RESET is true, |
| 2855 | // reset the addresses first. ADDR is the address and *POFF is the |
| 2856 | // file offset. Set the section indexes starting with *PSHNDX. |
| 2857 | // Return the address of the immediately following segment. Update |
| 2858 | // *POFF and *PSHNDX. |
| 2859 | |
| 2860 | uint64_t |
| 2861 | Output_segment::set_section_addresses(const Layout* layout, bool reset, |
| 2862 | uint64_t addr, off_t* poff, |
| 2863 | unsigned int* pshndx) |
| 2864 | { |
| 2865 | gold_assert(this->type_ == elfcpp::PT_LOAD); |
| 2866 | |
| 2867 | if (!reset && this->are_addresses_set_) |
| 2868 | { |
| 2869 | gold_assert(this->paddr_ == addr); |
| 2870 | addr = this->vaddr_; |
| 2871 | } |
| 2872 | else |
| 2873 | { |
| 2874 | this->vaddr_ = addr; |
| 2875 | this->paddr_ = addr; |
| 2876 | this->are_addresses_set_ = true; |
| 2877 | } |
| 2878 | |
| 2879 | bool in_tls = false; |
| 2880 | |
| 2881 | bool in_relro = (parameters->options().relro() |
| 2882 | && this->is_first_section_relro()); |
| 2883 | |
| 2884 | off_t orig_off = *poff; |
| 2885 | this->offset_ = orig_off; |
| 2886 | |
| 2887 | addr = this->set_section_list_addresses(layout, reset, &this->output_data_, |
| 2888 | addr, poff, pshndx, &in_tls, |
| 2889 | &in_relro); |
| 2890 | this->filesz_ = *poff - orig_off; |
| 2891 | |
| 2892 | off_t off = *poff; |
| 2893 | |
| 2894 | uint64_t ret = this->set_section_list_addresses(layout, reset, |
| 2895 | &this->output_bss_, |
| 2896 | addr, poff, pshndx, |
| 2897 | &in_tls, &in_relro); |
| 2898 | |
| 2899 | // If the last section was a TLS section, align upward to the |
| 2900 | // alignment of the TLS segment, so that the overall size of the TLS |
| 2901 | // segment is aligned. |
| 2902 | if (in_tls) |
| 2903 | { |
| 2904 | uint64_t segment_align = layout->tls_segment()->maximum_alignment(); |
| 2905 | *poff = align_address(*poff, segment_align); |
| 2906 | } |
| 2907 | |
| 2908 | // If all the sections were relro sections, align upward to the |
| 2909 | // common page size. |
| 2910 | if (in_relro) |
| 2911 | { |
| 2912 | uint64_t page_align = parameters->target().common_pagesize(); |
| 2913 | *poff = align_address(*poff, page_align); |
| 2914 | } |
| 2915 | |
| 2916 | this->memsz_ = *poff - orig_off; |
| 2917 | |
| 2918 | // Ignore the file offset adjustments made by the BSS Output_data |
| 2919 | // objects. |
| 2920 | *poff = off; |
| 2921 | |
| 2922 | return ret; |
| 2923 | } |
| 2924 | |
| 2925 | // Set the addresses and file offsets in a list of Output_data |
| 2926 | // structures. |
| 2927 | |
| 2928 | uint64_t |
| 2929 | Output_segment::set_section_list_addresses(const Layout* layout, bool reset, |
| 2930 | Output_data_list* pdl, |
| 2931 | uint64_t addr, off_t* poff, |
| 2932 | unsigned int* pshndx, |
| 2933 | bool* in_tls, bool* in_relro) |
| 2934 | { |
| 2935 | off_t startoff = *poff; |
| 2936 | |
| 2937 | off_t off = startoff; |
| 2938 | for (Output_data_list::iterator p = pdl->begin(); |
| 2939 | p != pdl->end(); |
| 2940 | ++p) |
| 2941 | { |
| 2942 | if (reset) |
| 2943 | (*p)->reset_address_and_file_offset(); |
| 2944 | |
| 2945 | // When using a linker script the section will most likely |
| 2946 | // already have an address. |
| 2947 | if (!(*p)->is_address_valid()) |
| 2948 | { |
| 2949 | uint64_t align = (*p)->addralign(); |
| 2950 | |
| 2951 | if ((*p)->is_section_flag_set(elfcpp::SHF_TLS)) |
| 2952 | { |
| 2953 | // Give the first TLS section the alignment of the |
| 2954 | // entire TLS segment. Otherwise the TLS segment as a |
| 2955 | // whole may be misaligned. |
| 2956 | if (!*in_tls) |
| 2957 | { |
| 2958 | Output_segment* tls_segment = layout->tls_segment(); |
| 2959 | gold_assert(tls_segment != NULL); |
| 2960 | uint64_t segment_align = tls_segment->maximum_alignment(); |
| 2961 | gold_assert(segment_align >= align); |
| 2962 | align = segment_align; |
| 2963 | |
| 2964 | *in_tls = true; |
| 2965 | } |
| 2966 | } |
| 2967 | else |
| 2968 | { |
| 2969 | // If this is the first section after the TLS segment, |
| 2970 | // align it to at least the alignment of the TLS |
| 2971 | // segment, so that the size of the overall TLS segment |
| 2972 | // is aligned. |
| 2973 | if (*in_tls) |
| 2974 | { |
| 2975 | uint64_t segment_align = |
| 2976 | layout->tls_segment()->maximum_alignment(); |
| 2977 | if (segment_align > align) |
| 2978 | align = segment_align; |
| 2979 | |
| 2980 | *in_tls = false; |
| 2981 | } |
| 2982 | } |
| 2983 | |
| 2984 | // If this is a non-relro section after a relro section, |
| 2985 | // align it to a common page boundary so that the dynamic |
| 2986 | // linker has a page to mark as read-only. |
| 2987 | if (*in_relro |
| 2988 | && (!(*p)->is_section() |
| 2989 | || !(*p)->output_section()->is_relro())) |
| 2990 | { |
| 2991 | uint64_t page_align = parameters->target().common_pagesize(); |
| 2992 | if (page_align > align) |
| 2993 | align = page_align; |
| 2994 | *in_relro = false; |
| 2995 | } |
| 2996 | |
| 2997 | off = align_address(off, align); |
| 2998 | (*p)->set_address_and_file_offset(addr + (off - startoff), off); |
| 2999 | } |
| 3000 | else |
| 3001 | { |
| 3002 | // The script may have inserted a skip forward, but it |
| 3003 | // better not have moved backward. |
| 3004 | gold_assert((*p)->address() >= addr + (off - startoff)); |
| 3005 | off += (*p)->address() - (addr + (off - startoff)); |
| 3006 | (*p)->set_file_offset(off); |
| 3007 | (*p)->finalize_data_size(); |
| 3008 | } |
| 3009 | |
| 3010 | // We want to ignore the size of a SHF_TLS or SHT_NOBITS |
| 3011 | // section. Such a section does not affect the size of a |
| 3012 | // PT_LOAD segment. |
| 3013 | if (!(*p)->is_section_flag_set(elfcpp::SHF_TLS) |
| 3014 | || !(*p)->is_section_type(elfcpp::SHT_NOBITS)) |
| 3015 | off += (*p)->data_size(); |
| 3016 | |
| 3017 | if ((*p)->is_section()) |
| 3018 | { |
| 3019 | (*p)->set_out_shndx(*pshndx); |
| 3020 | ++*pshndx; |
| 3021 | } |
| 3022 | } |
| 3023 | |
| 3024 | *poff = off; |
| 3025 | return addr + (off - startoff); |
| 3026 | } |
| 3027 | |
| 3028 | // For a non-PT_LOAD segment, set the offset from the sections, if |
| 3029 | // any. |
| 3030 | |
| 3031 | void |
| 3032 | Output_segment::set_offset() |
| 3033 | { |
| 3034 | gold_assert(this->type_ != elfcpp::PT_LOAD); |
| 3035 | |
| 3036 | gold_assert(!this->are_addresses_set_); |
| 3037 | |
| 3038 | if (this->output_data_.empty() && this->output_bss_.empty()) |
| 3039 | { |
| 3040 | this->vaddr_ = 0; |
| 3041 | this->paddr_ = 0; |
| 3042 | this->are_addresses_set_ = true; |
| 3043 | this->memsz_ = 0; |
| 3044 | this->min_p_align_ = 0; |
| 3045 | this->offset_ = 0; |
| 3046 | this->filesz_ = 0; |
| 3047 | return; |
| 3048 | } |
| 3049 | |
| 3050 | const Output_data* first; |
| 3051 | if (this->output_data_.empty()) |
| 3052 | first = this->output_bss_.front(); |
| 3053 | else |
| 3054 | first = this->output_data_.front(); |
| 3055 | this->vaddr_ = first->address(); |
| 3056 | this->paddr_ = (first->has_load_address() |
| 3057 | ? first->load_address() |
| 3058 | : this->vaddr_); |
| 3059 | this->are_addresses_set_ = true; |
| 3060 | this->offset_ = first->offset(); |
| 3061 | |
| 3062 | if (this->output_data_.empty()) |
| 3063 | this->filesz_ = 0; |
| 3064 | else |
| 3065 | { |
| 3066 | const Output_data* last_data = this->output_data_.back(); |
| 3067 | this->filesz_ = (last_data->address() |
| 3068 | + last_data->data_size() |
| 3069 | - this->vaddr_); |
| 3070 | } |
| 3071 | |
| 3072 | const Output_data* last; |
| 3073 | if (this->output_bss_.empty()) |
| 3074 | last = this->output_data_.back(); |
| 3075 | else |
| 3076 | last = this->output_bss_.back(); |
| 3077 | this->memsz_ = (last->address() |
| 3078 | + last->data_size() |
| 3079 | - this->vaddr_); |
| 3080 | |
| 3081 | // If this is a TLS segment, align the memory size. The code in |
| 3082 | // set_section_list ensures that the section after the TLS segment |
| 3083 | // is aligned to give us room. |
| 3084 | if (this->type_ == elfcpp::PT_TLS) |
| 3085 | { |
| 3086 | uint64_t segment_align = this->maximum_alignment(); |
| 3087 | gold_assert(this->vaddr_ == align_address(this->vaddr_, segment_align)); |
| 3088 | this->memsz_ = align_address(this->memsz_, segment_align); |
| 3089 | } |
| 3090 | |
| 3091 | // If this is a RELRO segment, align the memory size. The code in |
| 3092 | // set_section_list ensures that the section after the RELRO segment |
| 3093 | // is aligned to give us room. |
| 3094 | if (this->type_ == elfcpp::PT_GNU_RELRO) |
| 3095 | { |
| 3096 | uint64_t page_align = parameters->target().common_pagesize(); |
| 3097 | gold_assert(this->vaddr_ == align_address(this->vaddr_, page_align)); |
| 3098 | this->memsz_ = align_address(this->memsz_, page_align); |
| 3099 | } |
| 3100 | } |
| 3101 | |
| 3102 | // Set the TLS offsets of the sections in the PT_TLS segment. |
| 3103 | |
| 3104 | void |
| 3105 | Output_segment::set_tls_offsets() |
| 3106 | { |
| 3107 | gold_assert(this->type_ == elfcpp::PT_TLS); |
| 3108 | |
| 3109 | for (Output_data_list::iterator p = this->output_data_.begin(); |
| 3110 | p != this->output_data_.end(); |
| 3111 | ++p) |
| 3112 | (*p)->set_tls_offset(this->vaddr_); |
| 3113 | |
| 3114 | for (Output_data_list::iterator p = this->output_bss_.begin(); |
| 3115 | p != this->output_bss_.end(); |
| 3116 | ++p) |
| 3117 | (*p)->set_tls_offset(this->vaddr_); |
| 3118 | } |
| 3119 | |
| 3120 | // Return the address of the first section. |
| 3121 | |
| 3122 | uint64_t |
| 3123 | Output_segment::first_section_load_address() const |
| 3124 | { |
| 3125 | for (Output_data_list::const_iterator p = this->output_data_.begin(); |
| 3126 | p != this->output_data_.end(); |
| 3127 | ++p) |
| 3128 | if ((*p)->is_section()) |
| 3129 | return (*p)->has_load_address() ? (*p)->load_address() : (*p)->address(); |
| 3130 | |
| 3131 | for (Output_data_list::const_iterator p = this->output_bss_.begin(); |
| 3132 | p != this->output_bss_.end(); |
| 3133 | ++p) |
| 3134 | if ((*p)->is_section()) |
| 3135 | return (*p)->has_load_address() ? (*p)->load_address() : (*p)->address(); |
| 3136 | |
| 3137 | gold_unreachable(); |
| 3138 | } |
| 3139 | |
| 3140 | // Return the number of Output_sections in an Output_segment. |
| 3141 | |
| 3142 | unsigned int |
| 3143 | Output_segment::output_section_count() const |
| 3144 | { |
| 3145 | return (this->output_section_count_list(&this->output_data_) |
| 3146 | + this->output_section_count_list(&this->output_bss_)); |
| 3147 | } |
| 3148 | |
| 3149 | // Return the number of Output_sections in an Output_data_list. |
| 3150 | |
| 3151 | unsigned int |
| 3152 | Output_segment::output_section_count_list(const Output_data_list* pdl) const |
| 3153 | { |
| 3154 | unsigned int count = 0; |
| 3155 | for (Output_data_list::const_iterator p = pdl->begin(); |
| 3156 | p != pdl->end(); |
| 3157 | ++p) |
| 3158 | { |
| 3159 | if ((*p)->is_section()) |
| 3160 | ++count; |
| 3161 | } |
| 3162 | return count; |
| 3163 | } |
| 3164 | |
| 3165 | // Return the section attached to the list segment with the lowest |
| 3166 | // load address. This is used when handling a PHDRS clause in a |
| 3167 | // linker script. |
| 3168 | |
| 3169 | Output_section* |
| 3170 | Output_segment::section_with_lowest_load_address() const |
| 3171 | { |
| 3172 | Output_section* found = NULL; |
| 3173 | uint64_t found_lma = 0; |
| 3174 | this->lowest_load_address_in_list(&this->output_data_, &found, &found_lma); |
| 3175 | |
| 3176 | Output_section* found_data = found; |
| 3177 | this->lowest_load_address_in_list(&this->output_bss_, &found, &found_lma); |
| 3178 | if (found != found_data && found_data != NULL) |
| 3179 | { |
| 3180 | gold_error(_("nobits section %s may not precede progbits section %s " |
| 3181 | "in same segment"), |
| 3182 | found->name(), found_data->name()); |
| 3183 | return NULL; |
| 3184 | } |
| 3185 | |
| 3186 | return found; |
| 3187 | } |
| 3188 | |
| 3189 | // Look through a list for a section with a lower load address. |
| 3190 | |
| 3191 | void |
| 3192 | Output_segment::lowest_load_address_in_list(const Output_data_list* pdl, |
| 3193 | Output_section** found, |
| 3194 | uint64_t* found_lma) const |
| 3195 | { |
| 3196 | for (Output_data_list::const_iterator p = pdl->begin(); |
| 3197 | p != pdl->end(); |
| 3198 | ++p) |
| 3199 | { |
| 3200 | if (!(*p)->is_section()) |
| 3201 | continue; |
| 3202 | Output_section* os = static_cast<Output_section*>(*p); |
| 3203 | uint64_t lma = (os->has_load_address() |
| 3204 | ? os->load_address() |
| 3205 | : os->address()); |
| 3206 | if (*found == NULL || lma < *found_lma) |
| 3207 | { |
| 3208 | *found = os; |
| 3209 | *found_lma = lma; |
| 3210 | } |
| 3211 | } |
| 3212 | } |
| 3213 | |
| 3214 | // Write the segment data into *OPHDR. |
| 3215 | |
| 3216 | template<int size, bool big_endian> |
| 3217 | void |
| 3218 | Output_segment::write_header(elfcpp::Phdr_write<size, big_endian>* ophdr) |
| 3219 | { |
| 3220 | ophdr->put_p_type(this->type_); |
| 3221 | ophdr->put_p_offset(this->offset_); |
| 3222 | ophdr->put_p_vaddr(this->vaddr_); |
| 3223 | ophdr->put_p_paddr(this->paddr_); |
| 3224 | ophdr->put_p_filesz(this->filesz_); |
| 3225 | ophdr->put_p_memsz(this->memsz_); |
| 3226 | ophdr->put_p_flags(this->flags_); |
| 3227 | ophdr->put_p_align(std::max(this->min_p_align_, this->maximum_alignment())); |
| 3228 | } |
| 3229 | |
| 3230 | // Write the section headers into V. |
| 3231 | |
| 3232 | template<int size, bool big_endian> |
| 3233 | unsigned char* |
| 3234 | Output_segment::write_section_headers(const Layout* layout, |
| 3235 | const Stringpool* secnamepool, |
| 3236 | unsigned char* v, |
| 3237 | unsigned int *pshndx) const |
| 3238 | { |
| 3239 | // Every section that is attached to a segment must be attached to a |
| 3240 | // PT_LOAD segment, so we only write out section headers for PT_LOAD |
| 3241 | // segments. |
| 3242 | if (this->type_ != elfcpp::PT_LOAD) |
| 3243 | return v; |
| 3244 | |
| 3245 | v = this->write_section_headers_list<size, big_endian>(layout, secnamepool, |
| 3246 | &this->output_data_, |
| 3247 | v, pshndx); |
| 3248 | v = this->write_section_headers_list<size, big_endian>(layout, secnamepool, |
| 3249 | &this->output_bss_, |
| 3250 | v, pshndx); |
| 3251 | return v; |
| 3252 | } |
| 3253 | |
| 3254 | template<int size, bool big_endian> |
| 3255 | unsigned char* |
| 3256 | Output_segment::write_section_headers_list(const Layout* layout, |
| 3257 | const Stringpool* secnamepool, |
| 3258 | const Output_data_list* pdl, |
| 3259 | unsigned char* v, |
| 3260 | unsigned int* pshndx) const |
| 3261 | { |
| 3262 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 3263 | for (Output_data_list::const_iterator p = pdl->begin(); |
| 3264 | p != pdl->end(); |
| 3265 | ++p) |
| 3266 | { |
| 3267 | if ((*p)->is_section()) |
| 3268 | { |
| 3269 | const Output_section* ps = static_cast<const Output_section*>(*p); |
| 3270 | gold_assert(*pshndx == ps->out_shndx()); |
| 3271 | elfcpp::Shdr_write<size, big_endian> oshdr(v); |
| 3272 | ps->write_header(layout, secnamepool, &oshdr); |
| 3273 | v += shdr_size; |
| 3274 | ++*pshndx; |
| 3275 | } |
| 3276 | } |
| 3277 | return v; |
| 3278 | } |
| 3279 | |
| 3280 | // Print the output sections to the map file. |
| 3281 | |
| 3282 | void |
| 3283 | Output_segment::print_sections_to_mapfile(Mapfile* mapfile) const |
| 3284 | { |
| 3285 | if (this->type() != elfcpp::PT_LOAD) |
| 3286 | return; |
| 3287 | this->print_section_list_to_mapfile(mapfile, &this->output_data_); |
| 3288 | this->print_section_list_to_mapfile(mapfile, &this->output_bss_); |
| 3289 | } |
| 3290 | |
| 3291 | // Print an output section list to the map file. |
| 3292 | |
| 3293 | void |
| 3294 | Output_segment::print_section_list_to_mapfile(Mapfile* mapfile, |
| 3295 | const Output_data_list* pdl) const |
| 3296 | { |
| 3297 | for (Output_data_list::const_iterator p = pdl->begin(); |
| 3298 | p != pdl->end(); |
| 3299 | ++p) |
| 3300 | (*p)->print_to_mapfile(mapfile); |
| 3301 | } |
| 3302 | |
| 3303 | // Output_file methods. |
| 3304 | |
| 3305 | Output_file::Output_file(const char* name) |
| 3306 | : name_(name), |
| 3307 | o_(-1), |
| 3308 | file_size_(0), |
| 3309 | base_(NULL), |
| 3310 | map_is_anonymous_(false), |
| 3311 | is_temporary_(false) |
| 3312 | { |
| 3313 | } |
| 3314 | |
| 3315 | // Open the output file. |
| 3316 | |
| 3317 | void |
| 3318 | Output_file::open(off_t file_size) |
| 3319 | { |
| 3320 | this->file_size_ = file_size; |
| 3321 | |
| 3322 | // Unlink the file first; otherwise the open() may fail if the file |
| 3323 | // is busy (e.g. it's an executable that's currently being executed). |
| 3324 | // |
| 3325 | // However, the linker may be part of a system where a zero-length |
| 3326 | // file is created for it to write to, with tight permissions (gcc |
| 3327 | // 2.95 did something like this). Unlinking the file would work |
| 3328 | // around those permission controls, so we only unlink if the file |
| 3329 | // has a non-zero size. We also unlink only regular files to avoid |
| 3330 | // trouble with directories/etc. |
| 3331 | // |
| 3332 | // If we fail, continue; this command is merely a best-effort attempt |
| 3333 | // to improve the odds for open(). |
| 3334 | |
| 3335 | // We let the name "-" mean "stdout" |
| 3336 | if (!this->is_temporary_) |
| 3337 | { |
| 3338 | if (strcmp(this->name_, "-") == 0) |
| 3339 | this->o_ = STDOUT_FILENO; |
| 3340 | else |
| 3341 | { |
| 3342 | struct stat s; |
| 3343 | if (::stat(this->name_, &s) == 0 && s.st_size != 0) |
| 3344 | unlink_if_ordinary(this->name_); |
| 3345 | |
| 3346 | int mode = parameters->options().relocatable() ? 0666 : 0777; |
| 3347 | int o = open_descriptor(-1, this->name_, O_RDWR | O_CREAT | O_TRUNC, |
| 3348 | mode); |
| 3349 | if (o < 0) |
| 3350 | gold_fatal(_("%s: open: %s"), this->name_, strerror(errno)); |
| 3351 | this->o_ = o; |
| 3352 | } |
| 3353 | } |
| 3354 | |
| 3355 | this->map(); |
| 3356 | } |
| 3357 | |
| 3358 | // Resize the output file. |
| 3359 | |
| 3360 | void |
| 3361 | Output_file::resize(off_t file_size) |
| 3362 | { |
| 3363 | // If the mmap is mapping an anonymous memory buffer, this is easy: |
| 3364 | // just mremap to the new size. If it's mapping to a file, we want |
| 3365 | // to unmap to flush to the file, then remap after growing the file. |
| 3366 | if (this->map_is_anonymous_) |
| 3367 | { |
| 3368 | void* base = ::mremap(this->base_, this->file_size_, file_size, |
| 3369 | MREMAP_MAYMOVE); |
| 3370 | if (base == MAP_FAILED) |
| 3371 | gold_fatal(_("%s: mremap: %s"), this->name_, strerror(errno)); |
| 3372 | this->base_ = static_cast<unsigned char*>(base); |
| 3373 | this->file_size_ = file_size; |
| 3374 | } |
| 3375 | else |
| 3376 | { |
| 3377 | this->unmap(); |
| 3378 | this->file_size_ = file_size; |
| 3379 | this->map(); |
| 3380 | } |
| 3381 | } |
| 3382 | |
| 3383 | // Map a block of memory which will later be written to the file. |
| 3384 | // Return a pointer to the memory. |
| 3385 | |
| 3386 | void* |
| 3387 | Output_file::map_anonymous() |
| 3388 | { |
| 3389 | this->map_is_anonymous_ = true; |
| 3390 | return ::mmap(NULL, this->file_size_, PROT_READ | PROT_WRITE, |
| 3391 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| 3392 | } |
| 3393 | |
| 3394 | // Map the file into memory. |
| 3395 | |
| 3396 | void |
| 3397 | Output_file::map() |
| 3398 | { |
| 3399 | const int o = this->o_; |
| 3400 | |
| 3401 | // If the output file is not a regular file, don't try to mmap it; |
| 3402 | // instead, we'll mmap a block of memory (an anonymous buffer), and |
| 3403 | // then later write the buffer to the file. |
| 3404 | void* base; |
| 3405 | struct stat statbuf; |
| 3406 | if (o == STDOUT_FILENO || o == STDERR_FILENO |
| 3407 | || ::fstat(o, &statbuf) != 0 |
| 3408 | || !S_ISREG(statbuf.st_mode) |
| 3409 | || this->is_temporary_) |
| 3410 | base = this->map_anonymous(); |
| 3411 | else |
| 3412 | { |
| 3413 | // Ensure that we have disk space available for the file. If we |
| 3414 | // don't do this, it is possible that we will call munmap, |
| 3415 | // close, and exit with dirty buffers still in the cache with no |
| 3416 | // assigned disk blocks. If the disk is out of space at that |
| 3417 | // point, the output file will wind up incomplete, but we will |
| 3418 | // have already exited. The alternative to fallocate would be |
| 3419 | // to use fdatasync, but that would be a more significant |
| 3420 | // performance hit. |
| 3421 | if (::posix_fallocate(o, 0, this->file_size_) < 0) |
| 3422 | gold_fatal(_("%s: %s"), this->name_, strerror(errno)); |
| 3423 | |
| 3424 | // Map the file into memory. |
| 3425 | this->map_is_anonymous_ = false; |
| 3426 | base = ::mmap(NULL, this->file_size_, PROT_READ | PROT_WRITE, |
| 3427 | MAP_SHARED, o, 0); |
| 3428 | |
| 3429 | // The mmap call might fail because of file system issues: the |
| 3430 | // file system might not support mmap at all, or it might not |
| 3431 | // support mmap with PROT_WRITE. I'm not sure which errno |
| 3432 | // values we will see in all cases, so if the mmap fails for any |
| 3433 | // reason try for an anonymous map. |
| 3434 | if (base == MAP_FAILED) |
| 3435 | base = this->map_anonymous(); |
| 3436 | } |
| 3437 | if (base == MAP_FAILED) |
| 3438 | gold_fatal(_("%s: mmap: failed to allocate %lu bytes for output file: %s"), |
| 3439 | this->name_, static_cast<unsigned long>(this->file_size_), |
| 3440 | strerror(errno)); |
| 3441 | this->base_ = static_cast<unsigned char*>(base); |
| 3442 | } |
| 3443 | |
| 3444 | // Unmap the file from memory. |
| 3445 | |
| 3446 | void |
| 3447 | Output_file::unmap() |
| 3448 | { |
| 3449 | if (::munmap(this->base_, this->file_size_) < 0) |
| 3450 | gold_error(_("%s: munmap: %s"), this->name_, strerror(errno)); |
| 3451 | this->base_ = NULL; |
| 3452 | } |
| 3453 | |
| 3454 | // Close the output file. |
| 3455 | |
| 3456 | void |
| 3457 | Output_file::close() |
| 3458 | { |
| 3459 | // If the map isn't file-backed, we need to write it now. |
| 3460 | if (this->map_is_anonymous_ && !this->is_temporary_) |
| 3461 | { |
| 3462 | size_t bytes_to_write = this->file_size_; |
| 3463 | size_t offset = 0; |
| 3464 | while (bytes_to_write > 0) |
| 3465 | { |
| 3466 | ssize_t bytes_written = ::write(this->o_, this->base_ + offset, |
| 3467 | bytes_to_write); |
| 3468 | if (bytes_written == 0) |
| 3469 | gold_error(_("%s: write: unexpected 0 return-value"), this->name_); |
| 3470 | else if (bytes_written < 0) |
| 3471 | gold_error(_("%s: write: %s"), this->name_, strerror(errno)); |
| 3472 | else |
| 3473 | { |
| 3474 | bytes_to_write -= bytes_written; |
| 3475 | offset += bytes_written; |
| 3476 | } |
| 3477 | } |
| 3478 | } |
| 3479 | this->unmap(); |
| 3480 | |
| 3481 | // We don't close stdout or stderr |
| 3482 | if (this->o_ != STDOUT_FILENO |
| 3483 | && this->o_ != STDERR_FILENO |
| 3484 | && !this->is_temporary_) |
| 3485 | if (::close(this->o_) < 0) |
| 3486 | gold_error(_("%s: close: %s"), this->name_, strerror(errno)); |
| 3487 | this->o_ = -1; |
| 3488 | } |
| 3489 | |
| 3490 | // Instantiate the templates we need. We could use the configure |
| 3491 | // script to restrict this to only the ones for implemented targets. |
| 3492 | |
| 3493 | #ifdef HAVE_TARGET_32_LITTLE |
| 3494 | template |
| 3495 | off_t |
| 3496 | Output_section::add_input_section<32, false>( |
| 3497 | Sized_relobj<32, false>* object, |
| 3498 | unsigned int shndx, |
| 3499 | const char* secname, |
| 3500 | const elfcpp::Shdr<32, false>& shdr, |
| 3501 | unsigned int reloc_shndx, |
| 3502 | bool have_sections_script); |
| 3503 | #endif |
| 3504 | |
| 3505 | #ifdef HAVE_TARGET_32_BIG |
| 3506 | template |
| 3507 | off_t |
| 3508 | Output_section::add_input_section<32, true>( |
| 3509 | Sized_relobj<32, true>* object, |
| 3510 | unsigned int shndx, |
| 3511 | const char* secname, |
| 3512 | const elfcpp::Shdr<32, true>& shdr, |
| 3513 | unsigned int reloc_shndx, |
| 3514 | bool have_sections_script); |
| 3515 | #endif |
| 3516 | |
| 3517 | #ifdef HAVE_TARGET_64_LITTLE |
| 3518 | template |
| 3519 | off_t |
| 3520 | Output_section::add_input_section<64, false>( |
| 3521 | Sized_relobj<64, false>* object, |
| 3522 | unsigned int shndx, |
| 3523 | const char* secname, |
| 3524 | const elfcpp::Shdr<64, false>& shdr, |
| 3525 | unsigned int reloc_shndx, |
| 3526 | bool have_sections_script); |
| 3527 | #endif |
| 3528 | |
| 3529 | #ifdef HAVE_TARGET_64_BIG |
| 3530 | template |
| 3531 | off_t |
| 3532 | Output_section::add_input_section<64, true>( |
| 3533 | Sized_relobj<64, true>* object, |
| 3534 | unsigned int shndx, |
| 3535 | const char* secname, |
| 3536 | const elfcpp::Shdr<64, true>& shdr, |
| 3537 | unsigned int reloc_shndx, |
| 3538 | bool have_sections_script); |
| 3539 | #endif |
| 3540 | |
| 3541 | #ifdef HAVE_TARGET_32_LITTLE |
| 3542 | template |
| 3543 | class Output_reloc<elfcpp::SHT_REL, false, 32, false>; |
| 3544 | #endif |
| 3545 | |
| 3546 | #ifdef HAVE_TARGET_32_BIG |
| 3547 | template |
| 3548 | class Output_reloc<elfcpp::SHT_REL, false, 32, true>; |
| 3549 | #endif |
| 3550 | |
| 3551 | #ifdef HAVE_TARGET_64_LITTLE |
| 3552 | template |
| 3553 | class Output_reloc<elfcpp::SHT_REL, false, 64, false>; |
| 3554 | #endif |
| 3555 | |
| 3556 | #ifdef HAVE_TARGET_64_BIG |
| 3557 | template |
| 3558 | class Output_reloc<elfcpp::SHT_REL, false, 64, true>; |
| 3559 | #endif |
| 3560 | |
| 3561 | #ifdef HAVE_TARGET_32_LITTLE |
| 3562 | template |
| 3563 | class Output_reloc<elfcpp::SHT_REL, true, 32, false>; |
| 3564 | #endif |
| 3565 | |
| 3566 | #ifdef HAVE_TARGET_32_BIG |
| 3567 | template |
| 3568 | class Output_reloc<elfcpp::SHT_REL, true, 32, true>; |
| 3569 | #endif |
| 3570 | |
| 3571 | #ifdef HAVE_TARGET_64_LITTLE |
| 3572 | template |
| 3573 | class Output_reloc<elfcpp::SHT_REL, true, 64, false>; |
| 3574 | #endif |
| 3575 | |
| 3576 | #ifdef HAVE_TARGET_64_BIG |
| 3577 | template |
| 3578 | class Output_reloc<elfcpp::SHT_REL, true, 64, true>; |
| 3579 | #endif |
| 3580 | |
| 3581 | #ifdef HAVE_TARGET_32_LITTLE |
| 3582 | template |
| 3583 | class Output_reloc<elfcpp::SHT_RELA, false, 32, false>; |
| 3584 | #endif |
| 3585 | |
| 3586 | #ifdef HAVE_TARGET_32_BIG |
| 3587 | template |
| 3588 | class Output_reloc<elfcpp::SHT_RELA, false, 32, true>; |
| 3589 | #endif |
| 3590 | |
| 3591 | #ifdef HAVE_TARGET_64_LITTLE |
| 3592 | template |
| 3593 | class Output_reloc<elfcpp::SHT_RELA, false, 64, false>; |
| 3594 | #endif |
| 3595 | |
| 3596 | #ifdef HAVE_TARGET_64_BIG |
| 3597 | template |
| 3598 | class Output_reloc<elfcpp::SHT_RELA, false, 64, true>; |
| 3599 | #endif |
| 3600 | |
| 3601 | #ifdef HAVE_TARGET_32_LITTLE |
| 3602 | template |
| 3603 | class Output_reloc<elfcpp::SHT_RELA, true, 32, false>; |
| 3604 | #endif |
| 3605 | |
| 3606 | #ifdef HAVE_TARGET_32_BIG |
| 3607 | template |
| 3608 | class Output_reloc<elfcpp::SHT_RELA, true, 32, true>; |
| 3609 | #endif |
| 3610 | |
| 3611 | #ifdef HAVE_TARGET_64_LITTLE |
| 3612 | template |
| 3613 | class Output_reloc<elfcpp::SHT_RELA, true, 64, false>; |
| 3614 | #endif |
| 3615 | |
| 3616 | #ifdef HAVE_TARGET_64_BIG |
| 3617 | template |
| 3618 | class Output_reloc<elfcpp::SHT_RELA, true, 64, true>; |
| 3619 | #endif |
| 3620 | |
| 3621 | #ifdef HAVE_TARGET_32_LITTLE |
| 3622 | template |
| 3623 | class Output_data_reloc<elfcpp::SHT_REL, false, 32, false>; |
| 3624 | #endif |
| 3625 | |
| 3626 | #ifdef HAVE_TARGET_32_BIG |
| 3627 | template |
| 3628 | class Output_data_reloc<elfcpp::SHT_REL, false, 32, true>; |
| 3629 | #endif |
| 3630 | |
| 3631 | #ifdef HAVE_TARGET_64_LITTLE |
| 3632 | template |
| 3633 | class Output_data_reloc<elfcpp::SHT_REL, false, 64, false>; |
| 3634 | #endif |
| 3635 | |
| 3636 | #ifdef HAVE_TARGET_64_BIG |
| 3637 | template |
| 3638 | class Output_data_reloc<elfcpp::SHT_REL, false, 64, true>; |
| 3639 | #endif |
| 3640 | |
| 3641 | #ifdef HAVE_TARGET_32_LITTLE |
| 3642 | template |
| 3643 | class Output_data_reloc<elfcpp::SHT_REL, true, 32, false>; |
| 3644 | #endif |
| 3645 | |
| 3646 | #ifdef HAVE_TARGET_32_BIG |
| 3647 | template |
| 3648 | class Output_data_reloc<elfcpp::SHT_REL, true, 32, true>; |
| 3649 | #endif |
| 3650 | |
| 3651 | #ifdef HAVE_TARGET_64_LITTLE |
| 3652 | template |
| 3653 | class Output_data_reloc<elfcpp::SHT_REL, true, 64, false>; |
| 3654 | #endif |
| 3655 | |
| 3656 | #ifdef HAVE_TARGET_64_BIG |
| 3657 | template |
| 3658 | class Output_data_reloc<elfcpp::SHT_REL, true, 64, true>; |
| 3659 | #endif |
| 3660 | |
| 3661 | #ifdef HAVE_TARGET_32_LITTLE |
| 3662 | template |
| 3663 | class Output_data_reloc<elfcpp::SHT_RELA, false, 32, false>; |
| 3664 | #endif |
| 3665 | |
| 3666 | #ifdef HAVE_TARGET_32_BIG |
| 3667 | template |
| 3668 | class Output_data_reloc<elfcpp::SHT_RELA, false, 32, true>; |
| 3669 | #endif |
| 3670 | |
| 3671 | #ifdef HAVE_TARGET_64_LITTLE |
| 3672 | template |
| 3673 | class Output_data_reloc<elfcpp::SHT_RELA, false, 64, false>; |
| 3674 | #endif |
| 3675 | |
| 3676 | #ifdef HAVE_TARGET_64_BIG |
| 3677 | template |
| 3678 | class Output_data_reloc<elfcpp::SHT_RELA, false, 64, true>; |
| 3679 | #endif |
| 3680 | |
| 3681 | #ifdef HAVE_TARGET_32_LITTLE |
| 3682 | template |
| 3683 | class Output_data_reloc<elfcpp::SHT_RELA, true, 32, false>; |
| 3684 | #endif |
| 3685 | |
| 3686 | #ifdef HAVE_TARGET_32_BIG |
| 3687 | template |
| 3688 | class Output_data_reloc<elfcpp::SHT_RELA, true, 32, true>; |
| 3689 | #endif |
| 3690 | |
| 3691 | #ifdef HAVE_TARGET_64_LITTLE |
| 3692 | template |
| 3693 | class Output_data_reloc<elfcpp::SHT_RELA, true, 64, false>; |
| 3694 | #endif |
| 3695 | |
| 3696 | #ifdef HAVE_TARGET_64_BIG |
| 3697 | template |
| 3698 | class Output_data_reloc<elfcpp::SHT_RELA, true, 64, true>; |
| 3699 | #endif |
| 3700 | |
| 3701 | #ifdef HAVE_TARGET_32_LITTLE |
| 3702 | template |
| 3703 | class Output_relocatable_relocs<elfcpp::SHT_REL, 32, false>; |
| 3704 | #endif |
| 3705 | |
| 3706 | #ifdef HAVE_TARGET_32_BIG |
| 3707 | template |
| 3708 | class Output_relocatable_relocs<elfcpp::SHT_REL, 32, true>; |
| 3709 | #endif |
| 3710 | |
| 3711 | #ifdef HAVE_TARGET_64_LITTLE |
| 3712 | template |
| 3713 | class Output_relocatable_relocs<elfcpp::SHT_REL, 64, false>; |
| 3714 | #endif |
| 3715 | |
| 3716 | #ifdef HAVE_TARGET_64_BIG |
| 3717 | template |
| 3718 | class Output_relocatable_relocs<elfcpp::SHT_REL, 64, true>; |
| 3719 | #endif |
| 3720 | |
| 3721 | #ifdef HAVE_TARGET_32_LITTLE |
| 3722 | template |
| 3723 | class Output_relocatable_relocs<elfcpp::SHT_RELA, 32, false>; |
| 3724 | #endif |
| 3725 | |
| 3726 | #ifdef HAVE_TARGET_32_BIG |
| 3727 | template |
| 3728 | class Output_relocatable_relocs<elfcpp::SHT_RELA, 32, true>; |
| 3729 | #endif |
| 3730 | |
| 3731 | #ifdef HAVE_TARGET_64_LITTLE |
| 3732 | template |
| 3733 | class Output_relocatable_relocs<elfcpp::SHT_RELA, 64, false>; |
| 3734 | #endif |
| 3735 | |
| 3736 | #ifdef HAVE_TARGET_64_BIG |
| 3737 | template |
| 3738 | class Output_relocatable_relocs<elfcpp::SHT_RELA, 64, true>; |
| 3739 | #endif |
| 3740 | |
| 3741 | #ifdef HAVE_TARGET_32_LITTLE |
| 3742 | template |
| 3743 | class Output_data_group<32, false>; |
| 3744 | #endif |
| 3745 | |
| 3746 | #ifdef HAVE_TARGET_32_BIG |
| 3747 | template |
| 3748 | class Output_data_group<32, true>; |
| 3749 | #endif |
| 3750 | |
| 3751 | #ifdef HAVE_TARGET_64_LITTLE |
| 3752 | template |
| 3753 | class Output_data_group<64, false>; |
| 3754 | #endif |
| 3755 | |
| 3756 | #ifdef HAVE_TARGET_64_BIG |
| 3757 | template |
| 3758 | class Output_data_group<64, true>; |
| 3759 | #endif |
| 3760 | |
| 3761 | #ifdef HAVE_TARGET_32_LITTLE |
| 3762 | template |
| 3763 | class Output_data_got<32, false>; |
| 3764 | #endif |
| 3765 | |
| 3766 | #ifdef HAVE_TARGET_32_BIG |
| 3767 | template |
| 3768 | class Output_data_got<32, true>; |
| 3769 | #endif |
| 3770 | |
| 3771 | #ifdef HAVE_TARGET_64_LITTLE |
| 3772 | template |
| 3773 | class Output_data_got<64, false>; |
| 3774 | #endif |
| 3775 | |
| 3776 | #ifdef HAVE_TARGET_64_BIG |
| 3777 | template |
| 3778 | class Output_data_got<64, true>; |
| 3779 | #endif |
| 3780 | |
| 3781 | } // End namespace gold. |