gold/output.cc

   1 // output.cc -- manage the output file for gold
   2
   3 #include "gold.h"
   4
   5 #include <cstdlib>
   6 #include <cerrno>
   7 #include <fcntl.h>
   8 #include <unistd.h>
   9 #include <sys/mman.h>
  10 #include <algorithm>
  11
  12 #include "object.h"
  13 #include "symtab.h"
  14 #include "reloc.h"
  15 #include "merge.h"
  16 #include "output.h"
  17
  18 namespace gold
  19 {
  20
  21 // Output_data variables.
  22
  23 bool Output_data::sizes_are_fixed;
  24
  25 // Output_data methods.
  26
  27 Output_data::~Output_data()
  28 {
  29 }
  30
  31 // Set the address and offset.
  32
  33 void
  34 Output_data::set_address(uint64_t addr, off_t off)
  35 {
  36   this->address_ = addr;
  37   this->offset_ = off;
  38
  39   // Let the child class know.
  40   this->do_set_address(addr, off);
  41 }
  42
  43 // Return the default alignment for a size--32 or 64.
  44
  45 uint64_t
  46 Output_data::default_alignment(int size)
  47 {
  48   if (size == 32)
  49     return 4;
  50   else if (size == 64)
  51     return 8;
  52   else
  53     gold_unreachable();
  54 }
  55
  56 // Output_section_header methods.  This currently assumes that the
  57 // segment and section lists are complete at construction time.
  58
  59 Output_section_headers::Output_section_headers(
  60     int size,
  61     bool big_endian,
  62     const Layout* layout,
  63     const Layout::Segment_list* segment_list,
  64     const Layout::Section_list* unattached_section_list,
  65     const Stringpool* secnamepool)
  66   : size_(size),
  67     big_endian_(big_endian),
  68     layout_(layout),
  69     segment_list_(segment_list),
  70     unattached_section_list_(unattached_section_list),
  71     secnamepool_(secnamepool)
  72 {
  73   // Count all the sections.  Start with 1 for the null section.
  74   off_t count = 1;
  75   for (Layout::Segment_list::const_iterator p = segment_list->begin();
  76        p != segment_list->end();
  77        ++p)
  78     if ((*p)->type() == elfcpp::PT_LOAD)
  79       count += (*p)->output_section_count();
  80   count += unattached_section_list->size();
  81
  82   int shdr_size;
  83   if (size == 32)
  84     shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
  85   else if (size == 64)
  86     shdr_size = elfcpp::Elf_sizes<64>::shdr_size;
  87   else
  88     gold_unreachable();
  89
  90   this->set_data_size(count * shdr_size);
  91 }
  92
  93 // Write out the section headers.
  94
  95 void
  96 Output_section_headers::do_write(Output_file* of)
  97 {
  98   if (this->size_ == 32)
  99     {
 100       if (this->big_endian_)
 101         this->do_sized_write<32, true>(of);
 102       else
 103         this->do_sized_write<32, false>(of);
 104     }
 105   else if (this->size_ == 64)
 106     {
 107       if (this->big_endian_)
 108         this->do_sized_write<64, true>(of);
 109       else
 110         this->do_sized_write<64, false>(of);
 111     }
 112   else
 113     gold_unreachable();
 114 }
 115
 116 template<int size, bool big_endian>
 117 void
 118 Output_section_headers::do_sized_write(Output_file* of)
 119 {
 120   off_t all_shdrs_size = this->data_size();
 121   unsigned char* view = of->get_output_view(this->offset(), all_shdrs_size);
 122
 123   const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
 124   unsigned char* v = view;
 125
 126   {
 127     typename elfcpp::Shdr_write<size, big_endian> oshdr(v);
 128     oshdr.put_sh_name(0);
 129     oshdr.put_sh_type(elfcpp::SHT_NULL);
 130     oshdr.put_sh_flags(0);
 131     oshdr.put_sh_addr(0);
 132     oshdr.put_sh_offset(0);
 133     oshdr.put_sh_size(0);
 134     oshdr.put_sh_link(0);
 135     oshdr.put_sh_info(0);
 136     oshdr.put_sh_addralign(0);
 137     oshdr.put_sh_entsize(0);
 138   }
 139
 140   v += shdr_size;
 141
 142   unsigned shndx = 1;
 143   for (Layout::Segment_list::const_iterator p = this->segment_list_->begin();
 144        p != this->segment_list_->end();
 145        ++p)
 146     v = (*p)->write_section_headers SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
 147             this->layout_, this->secnamepool_, v, &shndx
 148             SELECT_SIZE_ENDIAN(size, big_endian));
 149   for (Layout::Section_list::const_iterator p =
 150          this->unattached_section_list_->begin();
 151        p != this->unattached_section_list_->end();
 152        ++p)
 153     {
 154       gold_assert(shndx == (*p)->out_shndx());
 155       elfcpp::Shdr_write<size, big_endian> oshdr(v);
 156       (*p)->write_header(this->layout_, this->secnamepool_, &oshdr);
 157       v += shdr_size;
 158       ++shndx;
 159     }
 160
 161   of->write_output_view(this->offset(), all_shdrs_size, view);
 162 }
 163
 164 // Output_segment_header methods.
 165
 166 Output_segment_headers::Output_segment_headers(
 167     int size,
 168     bool big_endian,
 169     const Layout::Segment_list& segment_list)
 170   : size_(size), big_endian_(big_endian), segment_list_(segment_list)
 171 {
 172   int phdr_size;
 173   if (size == 32)
 174     phdr_size = elfcpp::Elf_sizes<32>::phdr_size;
 175   else if (size == 64)
 176     phdr_size = elfcpp::Elf_sizes<64>::phdr_size;
 177   else
 178     gold_unreachable();
 179
 180   this->set_data_size(segment_list.size() * phdr_size);
 181 }
 182
 183 void
 184 Output_segment_headers::do_write(Output_file* of)
 185 {
 186   if (this->size_ == 32)
 187     {
 188       if (this->big_endian_)
 189         this->do_sized_write<32, true>(of);
 190       else
 191         this->do_sized_write<32, false>(of);
 192     }
 193   else if (this->size_ == 64)
 194     {
 195       if (this->big_endian_)
 196         this->do_sized_write<64, true>(of);
 197       else
 198         this->do_sized_write<64, false>(of);
 199     }
 200   else
 201     gold_unreachable();
 202 }
 203
 204 template<int size, bool big_endian>
 205 void
 206 Output_segment_headers::do_sized_write(Output_file* of)
 207 {
 208   const int phdr_size = elfcpp::Elf_sizes<size>::phdr_size;
 209   off_t all_phdrs_size = this->segment_list_.size() * phdr_size;
 210   unsigned char* view = of->get_output_view(this->offset(),
 211                                             all_phdrs_size);
 212   unsigned char* v = view;
 213   for (Layout::Segment_list::const_iterator p = this->segment_list_.begin();
 214        p != this->segment_list_.end();
 215        ++p)
 216     {
 217       elfcpp::Phdr_write<size, big_endian> ophdr(v);
 218       (*p)->write_header(&ophdr);
 219       v += phdr_size;
 220     }
 221
 222   of->write_output_view(this->offset(), all_phdrs_size, view);
 223 }
 224
 225 // Output_file_header methods.
 226
 227 Output_file_header::Output_file_header(int size,
 228                                        bool big_endian,
 229                                        const General_options& options,
 230                                        const Target* target,
 231                                        const Symbol_table* symtab,
 232                                        const Output_segment_headers* osh)
 233   : size_(size),
 234     big_endian_(big_endian),
 235     options_(options),
 236     target_(target),
 237     symtab_(symtab),
 238     segment_header_(osh),
 239     section_header_(NULL),
 240     shstrtab_(NULL)
 241 {
 242   int ehdr_size;
 243   if (size == 32)
 244     ehdr_size = elfcpp::Elf_sizes<32>::ehdr_size;
 245   else if (size == 64)
 246     ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
 247   else
 248     gold_unreachable();
 249
 250   this->set_data_size(ehdr_size);
 251 }
 252
 253 // Set the section table information for a file header.
 254
 255 void
 256 Output_file_header::set_section_info(const Output_section_headers* shdrs,
 257                                      const Output_section* shstrtab)
 258 {
 259   this->section_header_ = shdrs;
 260   this->shstrtab_ = shstrtab;
 261 }
 262
 263 // Write out the file header.
 264
 265 void
 266 Output_file_header::do_write(Output_file* of)
 267 {
 268   if (this->size_ == 32)
 269     {
 270       if (this->big_endian_)
 271         this->do_sized_write<32, true>(of);
 272       else
 273         this->do_sized_write<32, false>(of);
 274     }
 275   else if (this->size_ == 64)
 276     {
 277       if (this->big_endian_)
 278         this->do_sized_write<64, true>(of);
 279       else
 280         this->do_sized_write<64, false>(of);
 281     }
 282   else
 283     gold_unreachable();
 284 }
 285
 286 // Write out the file header with appropriate size and endianess.
 287
 288 template<int size, bool big_endian>
 289 void
 290 Output_file_header::do_sized_write(Output_file* of)
 291 {
 292   gold_assert(this->offset() == 0);
 293
 294   int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size;
 295   unsigned char* view = of->get_output_view(0, ehdr_size);
 296   elfcpp::Ehdr_write<size, big_endian> oehdr(view);
 297
 298   unsigned char e_ident[elfcpp::EI_NIDENT];
 299   memset(e_ident, 0, elfcpp::EI_NIDENT);
 300   e_ident[elfcpp::EI_MAG0] = elfcpp::ELFMAG0;
 301   e_ident[elfcpp::EI_MAG1] = elfcpp::ELFMAG1;
 302   e_ident[elfcpp::EI_MAG2] = elfcpp::ELFMAG2;
 303   e_ident[elfcpp::EI_MAG3] = elfcpp::ELFMAG3;
 304   if (size == 32)
 305     e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS32;
 306   else if (size == 64)
 307     e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS64;
 308   else
 309     gold_unreachable();
 310   e_ident[elfcpp::EI_DATA] = (big_endian
 311                               ? elfcpp::ELFDATA2MSB
 312                               : elfcpp::ELFDATA2LSB);
 313   e_ident[elfcpp::EI_VERSION] = elfcpp::EV_CURRENT;
 314   // FIXME: Some targets may need to set EI_OSABI and EI_ABIVERSION.
 315   oehdr.put_e_ident(e_ident);
 316
 317   elfcpp::ET e_type;
 318   // FIXME: ET_DYN.
 319   if (this->options_.is_relocatable())
 320     e_type = elfcpp::ET_REL;
 321   else
 322     e_type = elfcpp::ET_EXEC;
 323   oehdr.put_e_type(e_type);
 324
 325   oehdr.put_e_machine(this->target_->machine_code());
 326   oehdr.put_e_version(elfcpp::EV_CURRENT);
 327
 328   // FIXME: Need to support -e, and target specific entry symbol.
 329   Symbol* sym = this->symtab_->lookup("_start");
 330   typename Sized_symbol<size>::Value_type v;
 331   if (sym == NULL)
 332     v = 0;
 333   else
 334     {
 335       Sized_symbol<size>* ssym;
 336       ssym = this->symtab_->get_sized_symbol SELECT_SIZE_NAME(size) (
 337         sym SELECT_SIZE(size));
 338       v = ssym->value();
 339     }
 340   oehdr.put_e_entry(v);
 341
 342   oehdr.put_e_phoff(this->segment_header_->offset());
 343   oehdr.put_e_shoff(this->section_header_->offset());
 344
 345   // FIXME: The target needs to set the flags.
 346   oehdr.put_e_flags(0);
 347
 348   oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size);
 349   oehdr.put_e_phentsize(elfcpp::Elf_sizes<size>::phdr_size);
 350   oehdr.put_e_phnum(this->segment_header_->data_size()
 351                      / elfcpp::Elf_sizes<size>::phdr_size);
 352   oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size);
 353   oehdr.put_e_shnum(this->section_header_->data_size()
 354                      / elfcpp::Elf_sizes<size>::shdr_size);
 355   oehdr.put_e_shstrndx(this->shstrtab_->out_shndx());
 356
 357   of->write_output_view(0, ehdr_size, view);
 358 }
 359
 360 // Output_data_const methods.
 361
 362 void
 363 Output_data_const::do_write(Output_file* of)
 364 {
 365   of->write(this->offset(), this->data_.data(), this->data_.size());
 366 }
 367
 368 // Output_data_const_buffer methods.
 369
 370 void
 371 Output_data_const_buffer::do_write(Output_file* of)
 372 {
 373   of->write(this->offset(), this->p_, this->data_size());
 374 }
 375
 376 // Output_section_data methods.
 377
 378 // Record the output section, and set the entry size and such.
 379
 380 void
 381 Output_section_data::set_output_section(Output_section* os)
 382 {
 383   gold_assert(this->output_section_ == NULL);
 384   this->output_section_ = os;
 385   this->do_adjust_output_section(os);
 386 }
 387
 388 // Return the section index of the output section.
 389
 390 unsigned int
 391 Output_section_data::do_out_shndx() const
 392 {
 393   gold_assert(this->output_section_ != NULL);
 394   return this->output_section_->out_shndx();
 395 }
 396
 397 // Output_data_strtab methods.
 398
 399 // Set the address.  We don't actually care about the address, but we
 400 // do set our final size.
 401
 402 void
 403 Output_data_strtab::do_set_address(uint64_t, off_t)
 404 {
 405   this->strtab_->set_string_offsets();
 406   this->set_data_size(this->strtab_->get_strtab_size());
 407 }
 408
 409 // Write out a string table.
 410
 411 void
 412 Output_data_strtab::do_write(Output_file* of)
 413 {
 414   this->strtab_->write(of, this->offset());
 415 }
 416
 417 // Output_reloc methods.
 418
 419 // Get the symbol index of a relocation.
 420
 421 template<bool dynamic, int size, bool big_endian>
 422 unsigned int
 423 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::get_symbol_index()
 424   const
 425 {
 426   unsigned int index;
 427   switch (this->local_sym_index_)
 428     {
 429     case INVALID_CODE:
 430       gold_unreachable();
 431
 432     case GSYM_CODE:
 433       if (this->u1_.gsym == NULL)
 434         index = 0;
 435       else if (dynamic)
 436         index = this->u1_.gsym->dynsym_index();
 437       else
 438         index = this->u1_.gsym->symtab_index();
 439       break;
 440
 441     case SECTION_CODE:
 442       if (dynamic)
 443         index = this->u1_.os->dynsym_index();
 444       else
 445         index = this->u1_.os->symtab_index();
 446       break;
 447
 448     default:
 449       if (dynamic)
 450         {
 451           // FIXME: It seems that some targets may need to generate
 452           // dynamic relocations against local symbols for some
 453           // reasons.  This will have to be addressed at some point.
 454           gold_unreachable();
 455         }
 456       else
 457         index = this->u1_.relobj->symtab_index(this->local_sym_index_);
 458       break;
 459     }
 460   gold_assert(index != -1U);
 461   return index;
 462 }
 463
 464 // Write out the offset and info fields of a Rel or Rela relocation
 465 // entry.
 466
 467 template<bool dynamic, int size, bool big_endian>
 468 template<typename Write_rel>
 469 void
 470 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write_rel(
 471     Write_rel* wr) const
 472 {
 473   Address address = this->address_;
 474   if (this->shndx_ != INVALID_CODE)
 475     {
 476       off_t off;
 477       Output_section* os = this->u2_.relobj->output_section(this->shndx_,
 478                                                             &off);
 479       gold_assert(os != NULL);
 480       address += os->address() + off;
 481     }
 482   else if (this->u2_.od != NULL)
 483     address += this->u2_.od->address();
 484   wr->put_r_offset(address);
 485   wr->put_r_info(elfcpp::elf_r_info<size>(this->get_symbol_index(),
 486                                           this->type_));
 487 }
 488
 489 // Write out a Rel relocation.
 490
 491 template<bool dynamic, int size, bool big_endian>
 492 void
 493 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write(
 494     unsigned char* pov) const
 495 {
 496   elfcpp::Rel_write<size, big_endian> orel(pov);
 497   this->write_rel(&orel);
 498 }
 499
 500 // Write out a Rela relocation.
 501
 502 template<bool dynamic, int size, bool big_endian>
 503 void
 504 Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>::write(
 505     unsigned char* pov) const
 506 {
 507   elfcpp::Rela_write<size, big_endian> orel(pov);
 508   this->rel_.write_rel(&orel);
 509   orel.put_r_addend(this->addend_);
 510 }
 511
 512 // Output_data_reloc_base methods.
 513
 514 // Adjust the output section.
 515
 516 template<int sh_type, bool dynamic, int size, bool big_endian>
 517 void
 518 Output_data_reloc_base<sh_type, dynamic, size, big_endian>
 519     ::do_adjust_output_section(Output_section* os)
 520 {
 521   if (sh_type == elfcpp::SHT_REL)
 522     os->set_entsize(elfcpp::Elf_sizes<size>::rel_size);
 523   else if (sh_type == elfcpp::SHT_RELA)
 524     os->set_entsize(elfcpp::Elf_sizes<size>::rela_size);
 525   else
 526     gold_unreachable();
 527   if (dynamic)
 528     os->set_should_link_to_dynsym();
 529   else
 530     os->set_should_link_to_symtab();
 531 }
 532
 533 // Write out relocation data.
 534
 535 template<int sh_type, bool dynamic, int size, bool big_endian>
 536 void
 537 Output_data_reloc_base<sh_type, dynamic, size, big_endian>::do_write(
 538     Output_file* of)
 539 {
 540   const off_t off = this->offset();
 541   const off_t oview_size = this->data_size();
 542   unsigned char* const oview = of->get_output_view(off, oview_size);
 543
 544   unsigned char* pov = oview;
 545   for (typename Relocs::const_iterator p = this->relocs_.begin();
 546        p != this->relocs_.end();
 547        ++p)
 548     {
 549       p->write(pov);
 550       pov += reloc_size;
 551     }
 552
 553   gold_assert(pov - oview == oview_size);
 554
 555   of->write_output_view(off, oview_size, oview);
 556
 557   // We no longer need the relocation entries.
 558   this->relocs_.clear();
 559 }
 560
 561 // Output_data_got::Got_entry methods.
 562
 563 // Write out the entry.
 564
 565 template<int size, bool big_endian>
 566 void
 567 Output_data_got<size, big_endian>::Got_entry::write(
 568     const General_options* options,
 569     unsigned char* pov) const
 570 {
 571   Valtype val = 0;
 572
 573   switch (this->local_sym_index_)
 574     {
 575     case GSYM_CODE:
 576       {
 577         Symbol* gsym = this->u_.gsym;
 578
 579         // If the symbol is resolved locally, we need to write out its
 580         // value.  Otherwise we just write zero.  The target code is
 581         // responsible for creating a relocation entry to fill in the
 582         // value at runtime.
 583         if (gsym->final_value_is_known(options))
 584           {
 585             Sized_symbol<size>* sgsym;
 586             // This cast is a bit ugly.  We don't want to put a
 587             // virtual method in Symbol, because we want Symbol to be
 588             // as small as possible.
 589             sgsym = static_cast<Sized_symbol<size>*>(gsym);
 590             val = sgsym->value();
 591           }
 592       }
 593       break;
 594
 595     case CONSTANT_CODE:
 596       val = this->u_.constant;
 597       break;
 598
 599     default:
 600       gold_unreachable();
 601     }
 602
 603   elfcpp::Swap<size, big_endian>::writeval(pov, val);
 604 }
 605
 606 // Output_data_got methods.
 607
 608 // Add an entry for a global symbol to the GOT.  This returns true if
 609 // this is a new GOT entry, false if the symbol already had a GOT
 610 // entry.
 611
 612 template<int size, bool big_endian>
 613 bool
 614 Output_data_got<size, big_endian>::add_global(Symbol* gsym)
 615 {
 616   if (gsym->has_got_offset())
 617     return false;
 618
 619   this->entries_.push_back(Got_entry(gsym));
 620   this->set_got_size();
 621   gsym->set_got_offset(this->last_got_offset());
 622   return true;
 623 }
 624
 625 // Write out the GOT.
 626
 627 template<int size, bool big_endian>
 628 void
 629 Output_data_got<size, big_endian>::do_write(Output_file* of)
 630 {
 631   const int add = size / 8;
 632
 633   const off_t off = this->offset();
 634   const off_t oview_size = this->data_size();
 635   unsigned char* const oview = of->get_output_view(off, oview_size);
 636
 637   unsigned char* pov = oview;
 638   for (typename Got_entries::const_iterator p = this->entries_.begin();
 639        p != this->entries_.end();
 640        ++p)
 641     {
 642       p->write(this->options_, pov);
 643       pov += add;
 644     }
 645
 646   gold_assert(pov - oview == oview_size);
 647
 648   of->write_output_view(off, oview_size, oview);
 649
 650   // We no longer need the GOT entries.
 651   this->entries_.clear();
 652 }
 653
 654 // Output_data_dynamic::Dynamic_entry methods.
 655
 656 // Write out the entry.
 657
 658 template<int size, bool big_endian>
 659 void
 660 Output_data_dynamic::Dynamic_entry::write(
 661     unsigned char* pov,
 662     const Stringpool* pool
 663     ACCEPT_SIZE_ENDIAN) const
 664 {
 665   typename elfcpp::Elf_types<size>::Elf_WXword val;
 666   switch (this->classification_)
 667     {
 668     case DYNAMIC_NUMBER:
 669       val = this->u_.val;
 670       break;
 671
 672     case DYNAMIC_SECTION_ADDRESS:
 673       val = this->u_.od->address();
 674       break;
 675
 676     case DYNAMIC_SECTION_SIZE:
 677       val = this->u_.od->data_size();
 678       break;
 679
 680     case DYNAMIC_SYMBOL:
 681       {
 682         const Sized_symbol<size>* s =
 683           static_cast<const Sized_symbol<size>*>(this->u_.sym);
 684         val = s->value();
 685       }
 686       break;
 687
 688     case DYNAMIC_STRING:
 689       val = pool->get_offset(this->u_.str);
 690       break;
 691
 692     default:
 693       gold_unreachable();
 694     }
 695
 696   elfcpp::Dyn_write<size, big_endian> dw(pov);
 697   dw.put_d_tag(this->tag_);
 698   dw.put_d_val(val);
 699 }
 700
 701 // Output_data_dynamic methods.
 702
 703 // Adjust the output section to set the entry size.
 704
 705 void
 706 Output_data_dynamic::do_adjust_output_section(Output_section* os)
 707 {
 708   if (this->target_->get_size() == 32)
 709     os->set_entsize(elfcpp::Elf_sizes<32>::dyn_size);
 710   else if (this->target_->get_size() == 64)
 711     os->set_entsize(elfcpp::Elf_sizes<64>::dyn_size);
 712   else
 713     gold_unreachable();
 714 }
 715
 716 // Set the final data size.
 717
 718 void
 719 Output_data_dynamic::do_set_address(uint64_t, off_t)
 720 {
 721   // Add the terminating entry.
 722   this->add_constant(elfcpp::DT_NULL, 0);
 723
 724   int dyn_size;
 725   if (this->target_->get_size() == 32)
 726     dyn_size = elfcpp::Elf_sizes<32>::dyn_size;
 727   else if (this->target_->get_size() == 64)
 728     dyn_size = elfcpp::Elf_sizes<64>::dyn_size;
 729   else
 730     gold_unreachable();
 731   this->set_data_size(this->entries_.size() * dyn_size);
 732 }
 733
 734 // Write out the dynamic entries.
 735
 736 void
 737 Output_data_dynamic::do_write(Output_file* of)
 738 {
 739   if (this->target_->get_size() == 32)
 740     {
 741       if (this->target_->is_big_endian())
 742         this->sized_write<32, true>(of);
 743       else
 744         this->sized_write<32, false>(of);
 745     }
 746   else if (this->target_->get_size() == 64)
 747     {
 748       if (this->target_->is_big_endian())
 749         this->sized_write<64, true>(of);
 750       else
 751         this->sized_write<64, false>(of);
 752     }
 753   else
 754     gold_unreachable();
 755 }
 756
 757 template<int size, bool big_endian>
 758 void
 759 Output_data_dynamic::sized_write(Output_file* of)
 760 {
 761   const int dyn_size = elfcpp::Elf_sizes<size>::dyn_size;
 762
 763   const off_t offset = this->offset();
 764   const off_t oview_size = this->data_size();
 765   unsigned char* const oview = of->get_output_view(offset, oview_size);
 766
 767   unsigned char* pov = oview;
 768   for (typename Dynamic_entries::const_iterator p = this->entries_.begin();
 769        p != this->entries_.end();
 770        ++p)
 771     {
 772       p->write SELECT_SIZE_ENDIAN_NAME(size, big_endian)(
 773           pov, this->pool_ SELECT_SIZE_ENDIAN(size, big_endian));
 774       pov += dyn_size;
 775     }
 776
 777   gold_assert(pov - oview == oview_size);
 778
 779   of->write_output_view(offset, oview_size, oview);
 780
 781   // We no longer need the dynamic entries.
 782   this->entries_.clear();
 783 }
 784
 785 // Output_section::Input_section methods.
 786
 787 // Return the data size.  For an input section we store the size here.
 788 // For an Output_section_data, we have to ask it for the size.
 789
 790 off_t
 791 Output_section::Input_section::data_size() const
 792 {
 793   if (this->is_input_section())
 794     return this->u1_.data_size;
 795   else
 796     return this->u2_.posd->data_size();
 797 }
 798
 799 // Set the address and file offset.
 800
 801 void
 802 Output_section::Input_section::set_address(uint64_t addr, off_t off,
 803                                            off_t secoff)
 804 {
 805   if (this->is_input_section())
 806     this->u2_.object->set_section_offset(this->shndx_, off - secoff);
 807   else
 808     this->u2_.posd->set_address(addr, off);
 809 }
 810
 811 // Try to turn an input address into an output address.
 812
 813 bool
 814 Output_section::Input_section::output_address(const Relobj* object,
 815                                               unsigned int shndx,
 816                                               off_t offset,
 817                                               uint64_t output_section_address,
 818                                               uint64_t *poutput) const
 819 {
 820   if (!this->is_input_section())
 821     return this->u2_.posd->output_address(object, shndx, offset,
 822                                           output_section_address, poutput);
 823   else
 824     {
 825       if (this->u2_.object != object)
 826         return false;
 827       off_t output_offset;
 828       Output_section* os = object->output_section(shndx, &output_offset);
 829       gold_assert(os != NULL);
 830       *poutput = output_section_address + output_offset + offset;
 831       return true;
 832     }
 833 }
 834
 835 // Write out the data.  We don't have to do anything for an input
 836 // section--they are handled via Object::relocate--but this is where
 837 // we write out the data for an Output_section_data.
 838
 839 void
 840 Output_section::Input_section::write(Output_file* of)
 841 {
 842   if (!this->is_input_section())
 843     this->u2_.posd->write(of);
 844 }
 845
 846 // Output_section methods.
 847
 848 // Construct an Output_section.  NAME will point into a Stringpool.
 849
 850 Output_section::Output_section(const char* name, elfcpp::Elf_Word type,
 851                                elfcpp::Elf_Xword flags)
 852   : name_(name),
 853     addralign_(0),
 854     entsize_(0),
 855     link_section_(NULL),
 856     link_(0),
 857     info_section_(NULL),
 858     info_(0),
 859     type_(type),
 860     flags_(flags),
 861     out_shndx_(0),
 862     symtab_index_(0),
 863     dynsym_index_(0),
 864     input_sections_(),
 865     first_input_offset_(0),
 866     needs_symtab_index_(false),
 867     needs_dynsym_index_(false),
 868     should_link_to_symtab_(false),
 869     should_link_to_dynsym_(false)
 870 {
 871 }
 872
 873 Output_section::~Output_section()
 874 {
 875 }
 876
 877 // Set the entry size.
 878
 879 void
 880 Output_section::set_entsize(uint64_t v)
 881 {
 882   if (this->entsize_ == 0)
 883     this->entsize_ = v;
 884   else
 885     gold_assert(this->entsize_ == v);
 886 }
 887
 888 // Add the input section SHNDX, with header SHDR, named SECNAME, in
 889 // OBJECT, to the Output_section.  Return the offset of the input
 890 // section within the output section.  We don't always keep track of
 891 // input sections for an Output_section.  Instead, each Object keeps
 892 // track of the Output_section for each of its input sections.
 893
 894 template<int size, bool big_endian>
 895 off_t
 896 Output_section::add_input_section(Relobj* object, unsigned int shndx,
 897                                   const char* secname,
 898                                   const elfcpp::Shdr<size, big_endian>& shdr)
 899 {
 900   elfcpp::Elf_Xword addralign = shdr.get_sh_addralign();
 901   if ((addralign & (addralign - 1)) != 0)
 902     {
 903       fprintf(stderr, _("%s: %s: invalid alignment %lu for section \"%s\"\n"),
 904               program_name, object->name().c_str(),
 905               static_cast<unsigned long>(addralign), secname);
 906       gold_exit(false);
 907     }
 908
 909   if (addralign > this->addralign_)
 910     this->addralign_ = addralign;
 911
 912   // If this is a SHF_MERGE section, we pass all the input sections to
 913   // a Output_data_merge.
 914   if ((shdr.get_sh_flags() & elfcpp::SHF_MERGE) != 0)
 915     {
 916       if (this->add_merge_input_section(object, shndx, shdr.get_sh_flags(),
 917                                         shdr.get_sh_entsize(),
 918                                         addralign))
 919         {
 920           // Tell the relocation routines that they need to call the
 921           // output_address method to determine the final address.
 922           return -1;
 923         }
 924     }
 925
 926   off_t ssize = this->data_size();
 927   ssize = align_address(ssize, addralign);
 928   this->set_data_size(ssize + shdr.get_sh_size());
 929
 930   // We need to keep track of this section if we are already keeping
 931   // track of sections, or if we are relaxing.  FIXME: Add test for
 932   // relaxing.
 933   if (! this->input_sections_.empty())
 934     this->input_sections_.push_back(Input_section(object, shndx,
 935                                                   shdr.get_sh_size(),
 936                                                   addralign));
 937
 938   return ssize;
 939 }
 940
 941 // Add arbitrary data to an output section.
 942
 943 void
 944 Output_section::add_output_section_data(Output_section_data* posd)
 945 {
 946   Input_section inp(posd);
 947   this->add_output_section_data(&inp);
 948 }
 949
 950 // Add arbitrary data to an output section by Input_section.
 951
 952 void
 953 Output_section::add_output_section_data(Input_section* inp)
 954 {
 955   if (this->input_sections_.empty())
 956     this->first_input_offset_ = this->data_size();
 957
 958   this->input_sections_.push_back(*inp);
 959
 960   uint64_t addralign = inp->addralign();
 961   if (addralign > this->addralign_)
 962     this->addralign_ = addralign;
 963
 964   inp->set_output_section(this);
 965 }
 966
 967 // Add a merge section to an output section.
 968
 969 void
 970 Output_section::add_output_merge_section(Output_section_data* posd,
 971                                          bool is_string, uint64_t entsize)
 972 {
 973   Input_section inp(posd, is_string, entsize);
 974   this->add_output_section_data(&inp);
 975 }
 976
 977 // Add an input section to a SHF_MERGE section.
 978
 979 bool
 980 Output_section::add_merge_input_section(Relobj* object, unsigned int shndx,
 981                                         uint64_t flags, uint64_t entsize,
 982                                         uint64_t addralign)
 983 {
 984   // We only merge constants if the alignment is not more than the
 985   // entry size.  This could be handled, but it's unusual.
 986   if (addralign > entsize)
 987     return false;
 988
 989   bool is_string = (flags & elfcpp::SHF_STRINGS) != 0;
 990   Input_section_list::iterator p;
 991   for (p = this->input_sections_.begin();
 992        p != this->input_sections_.end();
 993        ++p)
 994     if (p->is_merge_section(is_string, entsize))
 995       break;
 996
 997   // We handle the actual constant merging in Output_merge_data or
 998   // Output_merge_string_data.
 999   if (p != this->input_sections_.end())
1000     p->add_input_section(object, shndx);
1001   else
1002     {
1003       Output_section_data* posd;
1004       if (!is_string)
1005         posd = new Output_merge_data(entsize);
1006       else if (entsize == 1)
1007         posd = new Output_merge_string<char>();
1008       else if (entsize == 2)
1009         posd = new Output_merge_string<uint16_t>();
1010       else if (entsize == 4)
1011         posd = new Output_merge_string<uint32_t>();
1012       else
1013         return false;
1014
1015       this->add_output_merge_section(posd, is_string, entsize);
1016       posd->add_input_section(object, shndx);
1017     }
1018
1019   return true;
1020 }
1021
1022 // Return the output virtual address of OFFSET relative to the start
1023 // of input section SHNDX in object OBJECT.
1024
1025 uint64_t
1026 Output_section::output_address(const Relobj* object, unsigned int shndx,
1027                                off_t offset) const
1028 {
1029   uint64_t addr = this->address() + this->first_input_offset_;
1030   for (Input_section_list::const_iterator p = this->input_sections_.begin();
1031        p != this->input_sections_.end();
1032        ++p)
1033     {
1034       addr = align_address(addr, p->addralign());
1035       uint64_t output;
1036       if (p->output_address(object, shndx, offset, addr, &output))
1037         return output;
1038       addr += p->data_size();
1039     }
1040
1041   // If we get here, it means that we don't know the mapping for this
1042   // input section.  This might happen in principle if
1043   // add_input_section were called before add_output_section_data.
1044   // But it should never actually happen.
1045
1046   gold_unreachable();
1047 }
1048
1049 // Set the address of an Output_section.  This is where we handle
1050 // setting the addresses of any Output_section_data objects.
1051
1052 void
1053 Output_section::do_set_address(uint64_t address, off_t startoff)
1054 {
1055   if (this->input_sections_.empty())
1056     return;
1057
1058   off_t off = startoff + this->first_input_offset_;
1059   for (Input_section_list::iterator p = this->input_sections_.begin();
1060        p != this->input_sections_.end();
1061        ++p)
1062     {
1063       off = align_address(off, p->addralign());
1064       p->set_address(address + (off - startoff), off, startoff);
1065       off += p->data_size();
1066     }
1067
1068   this->set_data_size(off - startoff);
1069 }
1070
1071 // Write the section header to *OSHDR.
1072
1073 template<int size, bool big_endian>
1074 void
1075 Output_section::write_header(const Layout* layout,
1076                              const Stringpool* secnamepool,
1077                              elfcpp::Shdr_write<size, big_endian>* oshdr) const
1078 {
1079   oshdr->put_sh_name(secnamepool->get_offset(this->name_));
1080   oshdr->put_sh_type(this->type_);
1081   oshdr->put_sh_flags(this->flags_);
1082   oshdr->put_sh_addr(this->address());
1083   oshdr->put_sh_offset(this->offset());
1084   oshdr->put_sh_size(this->data_size());
1085   if (this->link_section_ != NULL)
1086     oshdr->put_sh_link(this->link_section_->out_shndx());
1087   else if (this->should_link_to_symtab_)
1088     oshdr->put_sh_link(layout->symtab_section()->out_shndx());
1089   else if (this->should_link_to_dynsym_)
1090     oshdr->put_sh_link(layout->dynsym_section()->out_shndx());
1091   else
1092     oshdr->put_sh_link(this->link_);
1093   if (this->info_section_ != NULL)
1094     oshdr->put_sh_info(this->info_section_->out_shndx());
1095   else
1096     oshdr->put_sh_info(this->info_);
1097   oshdr->put_sh_addralign(this->addralign_);
1098   oshdr->put_sh_entsize(this->entsize_);
1099 }
1100
1101 // Write out the data.  For input sections the data is written out by
1102 // Object::relocate, but we have to handle Output_section_data objects
1103 // here.
1104
1105 void
1106 Output_section::do_write(Output_file* of)
1107 {
1108   for (Input_section_list::iterator p = this->input_sections_.begin();
1109        p != this->input_sections_.end();
1110        ++p)
1111     p->write(of);
1112 }
1113
1114 // Output segment methods.
1115
1116 Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags)
1117   : output_data_(),
1118     output_bss_(),
1119     vaddr_(0),
1120     paddr_(0),
1121     memsz_(0),
1122     align_(0),
1123     offset_(0),
1124     filesz_(0),
1125     type_(type),
1126     flags_(flags),
1127     is_align_known_(false)
1128 {
1129 }
1130
1131 // Add an Output_section to an Output_segment.
1132
1133 void
1134 Output_segment::add_output_section(Output_section* os,
1135                                    elfcpp::Elf_Word seg_flags,
1136                                    bool front)
1137 {
1138   gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0);
1139   gold_assert(!this->is_align_known_);
1140
1141   // Update the segment flags.
1142   this->flags_ |= seg_flags;
1143
1144   Output_segment::Output_data_list* pdl;
1145   if (os->type() == elfcpp::SHT_NOBITS)
1146     pdl = &this->output_bss_;
1147   else
1148     pdl = &this->output_data_;
1149
1150   // So that PT_NOTE segments will work correctly, we need to ensure
1151   // that all SHT_NOTE sections are adjacent.  This will normally
1152   // happen automatically, because all the SHT_NOTE input sections
1153   // will wind up in the same output section.  However, it is possible
1154   // for multiple SHT_NOTE input sections to have different section
1155   // flags, and thus be in different output sections, but for the
1156   // different section flags to map into the same segment flags and
1157   // thus the same output segment.
1158
1159   // Note that while there may be many input sections in an output
1160   // section, there are normally only a few output sections in an
1161   // output segment.  This loop is expected to be fast.
1162
1163   if (os->type() == elfcpp::SHT_NOTE && !pdl->empty())
1164     {
1165       Output_segment::Output_data_list::iterator p = pdl->end();
1166       do
1167         {
1168           --p;
1169           if ((*p)->is_section_type(elfcpp::SHT_NOTE))
1170             {
1171               // We don't worry about the FRONT parameter.
1172               ++p;
1173               pdl->insert(p, os);
1174               return;
1175             }
1176         }
1177       while (p != pdl->begin());
1178     }
1179
1180   // Similarly, so that PT_TLS segments will work, we need to group
1181   // SHF_TLS sections.  An SHF_TLS/SHT_NOBITS section is a special
1182   // case: we group the SHF_TLS/SHT_NOBITS sections right after the
1183   // SHF_TLS/SHT_PROGBITS sections.  This lets us set up PT_TLS
1184   // correctly.
1185   if ((os->flags() & elfcpp::SHF_TLS) != 0 && !this->output_data_.empty())
1186     {
1187       pdl = &this->output_data_;
1188       bool nobits = os->type() == elfcpp::SHT_NOBITS;
1189       bool sawtls = false;
1190       Output_segment::Output_data_list::iterator p = pdl->end();
1191       do
1192         {
1193           --p;
1194           bool insert;
1195           if ((*p)->is_section_flag_set(elfcpp::SHF_TLS))
1196             {
1197               sawtls = true;
1198               // Put a NOBITS section after the first TLS section.
1199               // But a PROGBITS section after the first TLS/PROGBITS
1200               // section.
1201               insert = nobits || !(*p)->is_section_type(elfcpp::SHT_NOBITS);
1202             }
1203           else
1204             {
1205               // If we've gone past the TLS sections, but we've seen a
1206               // TLS section, then we need to insert this section now.
1207               insert = sawtls;
1208             }
1209
1210           if (insert)
1211             {
1212               // We don't worry about the FRONT parameter.
1213               ++p;
1214               pdl->insert(p, os);
1215               return;
1216             }
1217         }
1218       while (p != pdl->begin());
1219
1220       // There are no TLS sections yet; put this one at the requested
1221       // location in the section list.
1222     }
1223
1224   if (front)
1225     pdl->push_front(os);
1226   else
1227     pdl->push_back(os);
1228 }
1229
1230 // Add an Output_data (which is not an Output_section) to the start of
1231 // a segment.
1232
1233 void
1234 Output_segment::add_initial_output_data(Output_data* od)
1235 {
1236   gold_assert(!this->is_align_known_);
1237   this->output_data_.push_front(od);
1238 }
1239
1240 // Return the maximum alignment of the Output_data in Output_segment.
1241 // Once we compute this, we prohibit new sections from being added.
1242
1243 uint64_t
1244 Output_segment::addralign()
1245 {
1246   if (!this->is_align_known_)
1247     {
1248       uint64_t addralign;
1249
1250       addralign = Output_segment::maximum_alignment(&this->output_data_);
1251       if (addralign > this->align_)
1252         this->align_ = addralign;
1253
1254       addralign = Output_segment::maximum_alignment(&this->output_bss_);
1255       if (addralign > this->align_)
1256         this->align_ = addralign;
1257
1258       this->is_align_known_ = true;
1259     }
1260
1261   return this->align_;
1262 }
1263
1264 // Return the maximum alignment of a list of Output_data.
1265
1266 uint64_t
1267 Output_segment::maximum_alignment(const Output_data_list* pdl)
1268 {
1269   uint64_t ret = 0;
1270   for (Output_data_list::const_iterator p = pdl->begin();
1271        p != pdl->end();
1272        ++p)
1273     {
1274       uint64_t addralign = (*p)->addralign();
1275       if (addralign > ret)
1276         ret = addralign;
1277     }
1278   return ret;
1279 }
1280
1281 // Set the section addresses for an Output_segment.  ADDR is the
1282 // address and *POFF is the file offset.  Set the section indexes
1283 // starting with *PSHNDX.  Return the address of the immediately
1284 // following segment.  Update *POFF and *PSHNDX.
1285
1286 uint64_t
1287 Output_segment::set_section_addresses(uint64_t addr, off_t* poff,
1288                                       unsigned int* pshndx)
1289 {
1290   gold_assert(this->type_ == elfcpp::PT_LOAD);
1291
1292   this->vaddr_ = addr;
1293   this->paddr_ = addr;
1294
1295   off_t orig_off = *poff;
1296   this->offset_ = orig_off;
1297
1298   *poff = align_address(*poff, this->addralign());
1299
1300   addr = this->set_section_list_addresses(&this->output_data_, addr, poff,
1301                                           pshndx);
1302   this->filesz_ = *poff - orig_off;
1303
1304   off_t off = *poff;
1305
1306   uint64_t ret = this->set_section_list_addresses(&this->output_bss_, addr,
1307                                                   poff, pshndx);
1308   this->memsz_ = *poff - orig_off;
1309
1310   // Ignore the file offset adjustments made by the BSS Output_data
1311   // objects.
1312   *poff = off;
1313
1314   return ret;
1315 }
1316
1317 // Set the addresses and file offsets in a list of Output_data
1318 // structures.
1319
1320 uint64_t
1321 Output_segment::set_section_list_addresses(Output_data_list* pdl,
1322                                            uint64_t addr, off_t* poff,
1323                                            unsigned int* pshndx)
1324 {
1325   off_t startoff = *poff;
1326
1327   off_t off = startoff;
1328   for (Output_data_list::iterator p = pdl->begin();
1329        p != pdl->end();
1330        ++p)
1331     {
1332       off = align_address(off, (*p)->addralign());
1333       (*p)->set_address(addr + (off - startoff), off);
1334
1335       // Unless this is a PT_TLS segment, we want to ignore the size
1336       // of a SHF_TLS/SHT_NOBITS section.  Such a section does not
1337       // affect the size of a PT_LOAD segment.
1338       if (this->type_ == elfcpp::PT_TLS
1339           || !(*p)->is_section_flag_set(elfcpp::SHF_TLS)
1340           || !(*p)->is_section_type(elfcpp::SHT_NOBITS))
1341         off += (*p)->data_size();
1342
1343       if ((*p)->is_section())
1344         {
1345           (*p)->set_out_shndx(*pshndx);
1346           ++*pshndx;
1347         }
1348     }
1349
1350   *poff = off;
1351   return addr + (off - startoff);
1352 }
1353
1354 // For a non-PT_LOAD segment, set the offset from the sections, if
1355 // any.
1356
1357 void
1358 Output_segment::set_offset()
1359 {
1360   gold_assert(this->type_ != elfcpp::PT_LOAD);
1361
1362   if (this->output_data_.empty() && this->output_bss_.empty())
1363     {
1364       this->vaddr_ = 0;
1365       this->paddr_ = 0;
1366       this->memsz_ = 0;
1367       this->align_ = 0;
1368       this->offset_ = 0;
1369       this->filesz_ = 0;
1370       return;
1371     }
1372
1373   const Output_data* first;
1374   if (this->output_data_.empty())
1375     first = this->output_bss_.front();
1376   else
1377     first = this->output_data_.front();
1378   this->vaddr_ = first->address();
1379   this->paddr_ = this->vaddr_;
1380   this->offset_ = first->offset();
1381
1382   if (this->output_data_.empty())
1383     this->filesz_ = 0;
1384   else
1385     {
1386       const Output_data* last_data = this->output_data_.back();
1387       this->filesz_ = (last_data->address()
1388                        + last_data->data_size()
1389                        - this->vaddr_);
1390     }
1391
1392   const Output_data* last;
1393   if (this->output_bss_.empty())
1394     last = this->output_data_.back();
1395   else
1396     last = this->output_bss_.back();
1397   this->memsz_ = (last->address()
1398                   + last->data_size()
1399                   - this->vaddr_);
1400 }
1401
1402 // Return the number of Output_sections in an Output_segment.
1403
1404 unsigned int
1405 Output_segment::output_section_count() const
1406 {
1407   return (this->output_section_count_list(&this->output_data_)
1408           + this->output_section_count_list(&this->output_bss_));
1409 }
1410
1411 // Return the number of Output_sections in an Output_data_list.
1412
1413 unsigned int
1414 Output_segment::output_section_count_list(const Output_data_list* pdl) const
1415 {
1416   unsigned int count = 0;
1417   for (Output_data_list::const_iterator p = pdl->begin();
1418        p != pdl->end();
1419        ++p)
1420     {
1421       if ((*p)->is_section())
1422         ++count;
1423     }
1424   return count;
1425 }
1426
1427 // Write the segment data into *OPHDR.
1428
1429 template<int size, bool big_endian>
1430 void
1431 Output_segment::write_header(elfcpp::Phdr_write<size, big_endian>* ophdr)
1432 {
1433   ophdr->put_p_type(this->type_);
1434   ophdr->put_p_offset(this->offset_);
1435   ophdr->put_p_vaddr(this->vaddr_);
1436   ophdr->put_p_paddr(this->paddr_);
1437   ophdr->put_p_filesz(this->filesz_);
1438   ophdr->put_p_memsz(this->memsz_);
1439   ophdr->put_p_flags(this->flags_);
1440   ophdr->put_p_align(this->addralign());
1441 }
1442
1443 // Write the section headers into V.
1444
1445 template<int size, bool big_endian>
1446 unsigned char*
1447 Output_segment::write_section_headers(const Layout* layout,
1448                                       const Stringpool* secnamepool,
1449                                       unsigned char* v,
1450                                       unsigned int *pshndx
1451                                       ACCEPT_SIZE_ENDIAN) const
1452 {
1453   // Every section that is attached to a segment must be attached to a
1454   // PT_LOAD segment, so we only write out section headers for PT_LOAD
1455   // segments.
1456   if (this->type_ != elfcpp::PT_LOAD)
1457     return v;
1458
1459   v = this->write_section_headers_list
1460       SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
1461           layout, secnamepool, &this->output_data_, v, pshndx
1462           SELECT_SIZE_ENDIAN(size, big_endian));
1463   v = this->write_section_headers_list
1464       SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
1465           layout, secnamepool, &this->output_bss_, v, pshndx
1466           SELECT_SIZE_ENDIAN(size, big_endian));
1467   return v;
1468 }
1469
1470 template<int size, bool big_endian>
1471 unsigned char*
1472 Output_segment::write_section_headers_list(const Layout* layout,
1473                                            const Stringpool* secnamepool,
1474                                            const Output_data_list* pdl,
1475                                            unsigned char* v,
1476                                            unsigned int* pshndx
1477                                            ACCEPT_SIZE_ENDIAN) const
1478 {
1479   const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
1480   for (Output_data_list::const_iterator p = pdl->begin();
1481        p != pdl->end();
1482        ++p)
1483     {
1484       if ((*p)->is_section())
1485         {
1486           const Output_section* ps = static_cast<const Output_section*>(*p);
1487           gold_assert(*pshndx == ps->out_shndx());
1488           elfcpp::Shdr_write<size, big_endian> oshdr(v);
1489           ps->write_header(layout, secnamepool, &oshdr);
1490           v += shdr_size;
1491           ++*pshndx;
1492         }
1493     }
1494   return v;
1495 }
1496
1497 // Output_file methods.
1498
1499 Output_file::Output_file(const General_options& options)
1500   : options_(options),
1501     name_(options.output_file_name()),
1502     o_(-1),
1503     file_size_(0),
1504     base_(NULL)
1505 {
1506 }
1507
1508 // Open the output file.
1509
1510 void
1511 Output_file::open(off_t file_size)
1512 {
1513   this->file_size_ = file_size;
1514
1515   int mode = this->options_.is_relocatable() ? 0666 : 0777;
1516   int o = ::open(this->name_, O_RDWR | O_CREAT | O_TRUNC, mode);
1517   if (o < 0)
1518     {
1519       fprintf(stderr, _("%s: %s: open: %s\n"),
1520               program_name, this->name_, strerror(errno));
1521       gold_exit(false);
1522     }
1523   this->o_ = o;
1524
1525   // Write out one byte to make the file the right size.
1526   if (::lseek(o, file_size - 1, SEEK_SET) < 0)
1527     {
1528       fprintf(stderr, _("%s: %s: lseek: %s\n"),
1529               program_name, this->name_, strerror(errno));
1530       gold_exit(false);
1531     }
1532   char b = 0;
1533   if (::write(o, &b, 1) != 1)
1534     {
1535       fprintf(stderr, _("%s: %s: write: %s\n"),
1536               program_name, this->name_, strerror(errno));
1537       gold_exit(false);
1538     }
1539
1540   // Map the file into memory.
1541   void* base = ::mmap(NULL, file_size, PROT_READ | PROT_WRITE,
1542                       MAP_SHARED, o, 0);
1543   if (base == MAP_FAILED)
1544     {
1545       fprintf(stderr, _("%s: %s: mmap: %s\n"),
1546               program_name, this->name_, strerror(errno));
1547       gold_exit(false);
1548     }
1549   this->base_ = static_cast<unsigned char*>(base);
1550 }
1551
1552 // Close the output file.
1553
1554 void
1555 Output_file::close()
1556 {
1557   if (::munmap(this->base_, this->file_size_) < 0)
1558     {
1559       fprintf(stderr, _("%s: %s: munmap: %s\n"),
1560               program_name, this->name_, strerror(errno));
1561       gold_exit(false);
1562     }
1563   this->base_ = NULL;
1564
1565   if (::close(this->o_) < 0)
1566     {
1567       fprintf(stderr, _("%s: %s: close: %s\n"),
1568               program_name, this->name_, strerror(errno));
1569       gold_exit(false);
1570     }
1571   this->o_ = -1;
1572 }
1573
1574 // Instantiate the templates we need.  We could use the configure
1575 // script to restrict this to only the ones for implemented targets.
1576
1577 #ifdef HAVE_TARGET_32_LITTLE
1578 template
1579 off_t
1580 Output_section::add_input_section<32, false>(
1581     Relobj* object,
1582     unsigned int shndx,
1583     const char* secname,
1584     const elfcpp::Shdr<32, false>& shdr);
1585 #endif
1586
1587 #ifdef HAVE_TARGET_32_BIG
1588 template
1589 off_t
1590 Output_section::add_input_section<32, true>(
1591     Relobj* object,
1592     unsigned int shndx,
1593     const char* secname,
1594     const elfcpp::Shdr<32, true>& shdr);
1595 #endif
1596
1597 #ifdef HAVE_TARGET_64_LITTLE
1598 template
1599 off_t
1600 Output_section::add_input_section<64, false>(
1601     Relobj* object,
1602     unsigned int shndx,
1603     const char* secname,
1604     const elfcpp::Shdr<64, false>& shdr);
1605 #endif
1606
1607 #ifdef HAVE_TARGET_64_BIG
1608 template
1609 off_t
1610 Output_section::add_input_section<64, true>(
1611     Relobj* object,
1612     unsigned int shndx,
1613     const char* secname,
1614     const elfcpp::Shdr<64, true>& shdr);
1615 #endif
1616
1617 #ifdef HAVE_TARGET_32_LITTLE
1618 template
1619 class Output_data_reloc<elfcpp::SHT_REL, false, 32, false>;
1620 #endif
1621
1622 #ifdef HAVE_TARGET_32_BIG
1623 template
1624 class Output_data_reloc<elfcpp::SHT_REL, false, 32, true>;
1625 #endif
1626
1627 #ifdef HAVE_TARGET_64_LITTLE
1628 template
1629 class Output_data_reloc<elfcpp::SHT_REL, false, 64, false>;
1630 #endif
1631
1632 #ifdef HAVE_TARGET_64_BIG
1633 template
1634 class Output_data_reloc<elfcpp::SHT_REL, false, 64, true>;
1635 #endif
1636
1637 #ifdef HAVE_TARGET_32_LITTLE
1638 template
1639 class Output_data_reloc<elfcpp::SHT_REL, true, 32, false>;
1640 #endif
1641
1642 #ifdef HAVE_TARGET_32_BIG
1643 template
1644 class Output_data_reloc<elfcpp::SHT_REL, true, 32, true>;
1645 #endif
1646
1647 #ifdef HAVE_TARGET_64_LITTLE
1648 template
1649 class Output_data_reloc<elfcpp::SHT_REL, true, 64, false>;
1650 #endif
1651
1652 #ifdef HAVE_TARGET_64_BIG
1653 template
1654 class Output_data_reloc<elfcpp::SHT_REL, true, 64, true>;
1655 #endif
1656
1657 #ifdef HAVE_TARGET_32_LITTLE
1658 template
1659 class Output_data_reloc<elfcpp::SHT_RELA, false, 32, false>;
1660 #endif
1661
1662 #ifdef HAVE_TARGET_32_BIG
1663 template
1664 class Output_data_reloc<elfcpp::SHT_RELA, false, 32, true>;
1665 #endif
1666
1667 #ifdef HAVE_TARGET_64_LITTLE
1668 template
1669 class Output_data_reloc<elfcpp::SHT_RELA, false, 64, false>;
1670 #endif
1671
1672 #ifdef HAVE_TARGET_64_BIG
1673 template
1674 class Output_data_reloc<elfcpp::SHT_RELA, false, 64, true>;
1675 #endif
1676
1677 #ifdef HAVE_TARGET_32_LITTLE
1678 template
1679 class Output_data_reloc<elfcpp::SHT_RELA, true, 32, false>;
1680 #endif
1681
1682 #ifdef HAVE_TARGET_32_BIG
1683 template
1684 class Output_data_reloc<elfcpp::SHT_RELA, true, 32, true>;
1685 #endif
1686
1687 #ifdef HAVE_TARGET_64_LITTLE
1688 template
1689 class Output_data_reloc<elfcpp::SHT_RELA, true, 64, false>;
1690 #endif
1691
1692 #ifdef HAVE_TARGET_64_BIG
1693 template
1694 class Output_data_reloc<elfcpp::SHT_RELA, true, 64, true>;
1695 #endif
1696
1697 #ifdef HAVE_TARGET_32_LITTLE
1698 template
1699 class Output_data_got<32, false>;
1700 #endif
1701
1702 #ifdef HAVE_TARGET_32_BIG
1703 template
1704 class Output_data_got<32, true>;
1705 #endif
1706
1707 #ifdef HAVE_TARGET_64_LITTLE
1708 template
1709 class Output_data_got<64, false>;
1710 #endif
1711
1712 #ifdef HAVE_TARGET_64_BIG
1713 template
1714 class Output_data_got<64, true>;
1715 #endif
1716
1717 } // End namespace gold.