gold/x86_64.cc

   1 // x86_64.cc -- x86_64 target support for gold.
   2
   3 // Copyright (C) 2006-2014 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 <cstring>
  26
  27 #include "elfcpp.h"
  28 #include "dwarf.h"
  29 #include "parameters.h"
  30 #include "reloc.h"
  31 #include "x86_64.h"
  32 #include "object.h"
  33 #include "symtab.h"
  34 #include "layout.h"
  35 #include "output.h"
  36 #include "copy-relocs.h"
  37 #include "target.h"
  38 #include "target-reloc.h"
  39 #include "target-select.h"
  40 #include "tls.h"
  41 #include "freebsd.h"
  42 #include "nacl.h"
  43 #include "gc.h"
  44 #include "icf.h"
  45
  46 namespace
  47 {
  48
  49 using namespace gold;
  50
  51 // A class to handle the .got.plt section.
  52
  53 class Output_data_got_plt_x86_64 : public Output_section_data_build
  54 {
  55  public:
  56   Output_data_got_plt_x86_64(Layout* layout)
  57     : Output_section_data_build(8),
  58       layout_(layout)
  59   { }
  60
  61   Output_data_got_plt_x86_64(Layout* layout, off_t data_size)
  62     : Output_section_data_build(data_size, 8),
  63       layout_(layout)
  64   { }
  65
  66  protected:
  67   // Write out the PLT data.
  68   void
  69   do_write(Output_file*);
  70
  71   // Write to a map file.
  72   void
  73   do_print_to_mapfile(Mapfile* mapfile) const
  74   { mapfile->print_output_data(this, "** GOT PLT"); }
  75
  76  private:
  77   // A pointer to the Layout class, so that we can find the .dynamic
  78   // section when we write out the GOT PLT section.
  79   Layout* layout_;
  80 };
  81
  82 // A class to handle the PLT data.
  83 // This is an abstract base class that handles most of the linker details
  84 // but does not know the actual contents of PLT entries.  The derived
  85 // classes below fill in those details.
  86
  87 template<int size>
  88 class Output_data_plt_x86_64 : public Output_section_data
  89 {
  90  public:
  91   typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
  92
  93   Output_data_plt_x86_64(Layout* layout, uint64_t addralign,
  94                          Output_data_got<64, false>* got,
  95                          Output_data_got_plt_x86_64* got_plt,
  96                          Output_data_space* got_irelative)
  97     : Output_section_data(addralign), tlsdesc_rel_(NULL),
  98       irelative_rel_(NULL), got_(got), got_plt_(got_plt),
  99       got_irelative_(got_irelative), count_(0), irelative_count_(0),
 100       tlsdesc_got_offset_(-1U), free_list_()
 101   { this->init(layout); }
 102
 103   Output_data_plt_x86_64(Layout* layout, uint64_t plt_entry_size,
 104                          Output_data_got<64, false>* got,
 105                          Output_data_got_plt_x86_64* got_plt,
 106                          Output_data_space* got_irelative,
 107                          unsigned int plt_count)
 108     : Output_section_data((plt_count + 1) * plt_entry_size,
 109                           plt_entry_size, false),
 110       tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got),
 111       got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count),
 112       irelative_count_(0), tlsdesc_got_offset_(-1U), free_list_()
 113   {
 114     this->init(layout);
 115
 116     // Initialize the free list and reserve the first entry.
 117     this->free_list_.init((plt_count + 1) * plt_entry_size, false);
 118     this->free_list_.remove(0, plt_entry_size);
 119   }
 120
 121   // Initialize the PLT section.
 122   void
 123   init(Layout* layout);
 124
 125   // Add an entry to the PLT.
 126   void
 127   add_entry(Symbol_table*, Layout*, Symbol* gsym);
 128
 129   // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
 130   unsigned int
 131   add_local_ifunc_entry(Symbol_table* symtab, Layout*,
 132                         Sized_relobj_file<size, false>* relobj,
 133                         unsigned int local_sym_index);
 134
 135   // Add the relocation for a PLT entry.
 136   void
 137   add_relocation(Symbol_table*, Layout*, Symbol* gsym,
 138                  unsigned int got_offset);
 139
 140   // Add the reserved TLSDESC_PLT entry to the PLT.
 141   void
 142   reserve_tlsdesc_entry(unsigned int got_offset)
 143   { this->tlsdesc_got_offset_ = got_offset; }
 144
 145   // Return true if a TLSDESC_PLT entry has been reserved.
 146   bool
 147   has_tlsdesc_entry() const
 148   { return this->tlsdesc_got_offset_ != -1U; }
 149
 150   // Return the GOT offset for the reserved TLSDESC_PLT entry.
 151   unsigned int
 152   get_tlsdesc_got_offset() const
 153   { return this->tlsdesc_got_offset_; }
 154
 155   // Return the offset of the reserved TLSDESC_PLT entry.
 156   unsigned int
 157   get_tlsdesc_plt_offset() const
 158   {
 159     return ((this->count_ + this->irelative_count_ + 1)
 160             * this->get_plt_entry_size());
 161   }
 162
 163   // Return the .rela.plt section data.
 164   Reloc_section*
 165   rela_plt()
 166   { return this->rel_; }
 167
 168   // Return where the TLSDESC relocations should go.
 169   Reloc_section*
 170   rela_tlsdesc(Layout*);
 171
 172   // Return where the IRELATIVE relocations should go in the PLT
 173   // relocations.
 174   Reloc_section*
 175   rela_irelative(Symbol_table*, Layout*);
 176
 177   // Return whether we created a section for IRELATIVE relocations.
 178   bool
 179   has_irelative_section() const
 180   { return this->irelative_rel_ != NULL; }
 181
 182   // Return the number of PLT entries.
 183   unsigned int
 184   entry_count() const
 185   { return this->count_ + this->irelative_count_; }
 186
 187   // Return the offset of the first non-reserved PLT entry.
 188   unsigned int
 189   first_plt_entry_offset()
 190   { return this->get_plt_entry_size(); }
 191
 192   // Return the size of a PLT entry.
 193   unsigned int
 194   get_plt_entry_size() const
 195   { return this->do_get_plt_entry_size(); }
 196
 197   // Reserve a slot in the PLT for an existing symbol in an incremental update.
 198   void
 199   reserve_slot(unsigned int plt_index)
 200   {
 201     this->free_list_.remove((plt_index + 1) * this->get_plt_entry_size(),
 202                             (plt_index + 2) * this->get_plt_entry_size());
 203   }
 204
 205   // Return the PLT address to use for a global symbol.
 206   uint64_t
 207   address_for_global(const Symbol*);
 208
 209   // Return the PLT address to use for a local symbol.
 210   uint64_t
 211   address_for_local(const Relobj*, unsigned int symndx);
 212
 213   // Add .eh_frame information for the PLT.
 214   void
 215   add_eh_frame(Layout* layout)
 216   { this->do_add_eh_frame(layout); }
 217
 218  protected:
 219   // Fill in the first PLT entry.
 220   void
 221   fill_first_plt_entry(unsigned char* pov,
 222                        typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 223                        typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
 224   { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
 225
 226   // Fill in a normal PLT entry.  Returns the offset into the entry that
 227   // should be the initial GOT slot value.
 228   unsigned int
 229   fill_plt_entry(unsigned char* pov,
 230                  typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 231                  typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
 232                  unsigned int got_offset,
 233                  unsigned int plt_offset,
 234                  unsigned int plt_index)
 235   {
 236     return this->do_fill_plt_entry(pov, got_address, plt_address,
 237                                    got_offset, plt_offset, plt_index);
 238   }
 239
 240   // Fill in the reserved TLSDESC PLT entry.
 241   void
 242   fill_tlsdesc_entry(unsigned char* pov,
 243                      typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 244                      typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
 245                      typename elfcpp::Elf_types<size>::Elf_Addr got_base,
 246                      unsigned int tlsdesc_got_offset,
 247                      unsigned int plt_offset)
 248   {
 249     this->do_fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
 250                                 tlsdesc_got_offset, plt_offset);
 251   }
 252
 253   virtual unsigned int
 254   do_get_plt_entry_size() const = 0;
 255
 256   virtual void
 257   do_fill_first_plt_entry(unsigned char* pov,
 258                           typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
 259                           typename elfcpp::Elf_types<size>::Elf_Addr plt_addr)
 260     = 0;
 261
 262   virtual unsigned int
 263   do_fill_plt_entry(unsigned char* pov,
 264                     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 265                     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
 266                     unsigned int got_offset,
 267                     unsigned int plt_offset,
 268                     unsigned int plt_index) = 0;
 269
 270   virtual void
 271   do_fill_tlsdesc_entry(unsigned char* pov,
 272                         typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 273                         typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
 274                         typename elfcpp::Elf_types<size>::Elf_Addr got_base,
 275                         unsigned int tlsdesc_got_offset,
 276                         unsigned int plt_offset) = 0;
 277
 278   virtual void
 279   do_add_eh_frame(Layout* layout) = 0;
 280
 281   void
 282   do_adjust_output_section(Output_section* os);
 283
 284   // Write to a map file.
 285   void
 286   do_print_to_mapfile(Mapfile* mapfile) const
 287   { mapfile->print_output_data(this, _("** PLT")); }
 288
 289   // The CIE of the .eh_frame unwind information for the PLT.
 290   static const int plt_eh_frame_cie_size = 16;
 291   static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size];
 292
 293  private:
 294   // Set the final size.
 295   void
 296   set_final_data_size();
 297
 298   // Write out the PLT data.
 299   void
 300   do_write(Output_file*);
 301
 302   // The reloc section.
 303   Reloc_section* rel_;
 304   // The TLSDESC relocs, if necessary.  These must follow the regular
 305   // PLT relocs.
 306   Reloc_section* tlsdesc_rel_;
 307   // The IRELATIVE relocs, if necessary.  These must follow the
 308   // regular PLT relocations and the TLSDESC relocations.
 309   Reloc_section* irelative_rel_;
 310   // The .got section.
 311   Output_data_got<64, false>* got_;
 312   // The .got.plt section.
 313   Output_data_got_plt_x86_64* got_plt_;
 314   // The part of the .got.plt section used for IRELATIVE relocs.
 315   Output_data_space* got_irelative_;
 316   // The number of PLT entries.
 317   unsigned int count_;
 318   // Number of PLT entries with R_X86_64_IRELATIVE relocs.  These
 319   // follow the regular PLT entries.
 320   unsigned int irelative_count_;
 321   // Offset of the reserved TLSDESC_GOT entry when needed.
 322   unsigned int tlsdesc_got_offset_;
 323   // List of available regions within the section, for incremental
 324   // update links.
 325   Free_list free_list_;
 326 };
 327
 328 template<int size>
 329 class Output_data_plt_x86_64_standard : public Output_data_plt_x86_64<size>
 330 {
 331  public:
 332   Output_data_plt_x86_64_standard(Layout* layout,
 333                                   Output_data_got<64, false>* got,
 334                                   Output_data_got_plt_x86_64* got_plt,
 335                                   Output_data_space* got_irelative)
 336     : Output_data_plt_x86_64<size>(layout, plt_entry_size,
 337                                    got, got_plt, got_irelative)
 338   { }
 339
 340   Output_data_plt_x86_64_standard(Layout* layout,
 341                                   Output_data_got<64, false>* got,
 342                                   Output_data_got_plt_x86_64* got_plt,
 343                                   Output_data_space* got_irelative,
 344                                   unsigned int plt_count)
 345     : Output_data_plt_x86_64<size>(layout, plt_entry_size,
 346                                    got, got_plt, got_irelative,
 347                                    plt_count)
 348   { }
 349
 350  protected:
 351   virtual unsigned int
 352   do_get_plt_entry_size() const
 353   { return plt_entry_size; }
 354
 355   virtual void
 356   do_add_eh_frame(Layout* layout)
 357   {
 358     layout->add_eh_frame_for_plt(this,
 359                                  this->plt_eh_frame_cie,
 360                                  this->plt_eh_frame_cie_size,
 361                                  plt_eh_frame_fde,
 362                                  plt_eh_frame_fde_size);
 363   }
 364
 365   virtual void
 366   do_fill_first_plt_entry(unsigned char* pov,
 367                           typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
 368                           typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
 369
 370   virtual unsigned int
 371   do_fill_plt_entry(unsigned char* pov,
 372                     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 373                     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
 374                     unsigned int got_offset,
 375                     unsigned int plt_offset,
 376                     unsigned int plt_index);
 377
 378   virtual void
 379   do_fill_tlsdesc_entry(unsigned char* pov,
 380                         typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 381                         typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
 382                         typename elfcpp::Elf_types<size>::Elf_Addr got_base,
 383                         unsigned int tlsdesc_got_offset,
 384                         unsigned int plt_offset);
 385
 386  private:
 387   // The size of an entry in the PLT.
 388   static const int plt_entry_size = 16;
 389
 390   // The first entry in the PLT.
 391   // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
 392   // procedure linkage table for both programs and shared objects."
 393   static const unsigned char first_plt_entry[plt_entry_size];
 394
 395   // Other entries in the PLT for an executable.
 396   static const unsigned char plt_entry[plt_entry_size];
 397
 398   // The reserved TLSDESC entry in the PLT for an executable.
 399   static const unsigned char tlsdesc_plt_entry[plt_entry_size];
 400
 401   // The .eh_frame unwind information for the PLT.
 402   static const int plt_eh_frame_fde_size = 32;
 403   static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
 404 };
 405
 406 // The x86_64 target class.
 407 // See the ABI at
 408 //   http://www.x86-64.org/documentation/abi.pdf
 409 // TLS info comes from
 410 //   http://people.redhat.com/drepper/tls.pdf
 411 //   http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
 412
 413 template<int size>
 414 class Target_x86_64 : public Sized_target<size, false>
 415 {
 416  public:
 417   // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
 418   // uses only Elf64_Rela relocation entries with explicit addends."
 419   typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
 420
 421   Target_x86_64(const Target::Target_info* info = &x86_64_info)
 422     : Sized_target<size, false>(info),
 423       got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
 424       got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL),
 425       rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY),
 426       got_mod_index_offset_(-1U), tlsdesc_reloc_info_(),
 427       tls_base_symbol_defined_(false)
 428   { }
 429
 430   // Hook for a new output section.
 431   void
 432   do_new_output_section(Output_section*) const;
 433
 434   // Scan the relocations to look for symbol adjustments.
 435   void
 436   gc_process_relocs(Symbol_table* symtab,
 437                     Layout* layout,
 438                     Sized_relobj_file<size, false>* object,
 439                     unsigned int data_shndx,
 440                     unsigned int sh_type,
 441                     const unsigned char* prelocs,
 442                     size_t reloc_count,
 443                     Output_section* output_section,
 444                     bool needs_special_offset_handling,
 445                     size_t local_symbol_count,
 446                     const unsigned char* plocal_symbols);
 447
 448   // Scan the relocations to look for symbol adjustments.
 449   void
 450   scan_relocs(Symbol_table* symtab,
 451               Layout* layout,
 452               Sized_relobj_file<size, false>* object,
 453               unsigned int data_shndx,
 454               unsigned int sh_type,
 455               const unsigned char* prelocs,
 456               size_t reloc_count,
 457               Output_section* output_section,
 458               bool needs_special_offset_handling,
 459               size_t local_symbol_count,
 460               const unsigned char* plocal_symbols);
 461
 462   // Finalize the sections.
 463   void
 464   do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
 465
 466   // Return the value to use for a dynamic which requires special
 467   // treatment.
 468   uint64_t
 469   do_dynsym_value(const Symbol*) const;
 470
 471   // Relocate a section.
 472   void
 473   relocate_section(const Relocate_info<size, false>*,
 474                    unsigned int sh_type,
 475                    const unsigned char* prelocs,
 476                    size_t reloc_count,
 477                    Output_section* output_section,
 478                    bool needs_special_offset_handling,
 479                    unsigned char* view,
 480                    typename elfcpp::Elf_types<size>::Elf_Addr view_address,
 481                    section_size_type view_size,
 482                    const Reloc_symbol_changes*);
 483
 484   // Scan the relocs during a relocatable link.
 485   void
 486   scan_relocatable_relocs(Symbol_table* symtab,
 487                           Layout* layout,
 488                           Sized_relobj_file<size, false>* object,
 489                           unsigned int data_shndx,
 490                           unsigned int sh_type,
 491                           const unsigned char* prelocs,
 492                           size_t reloc_count,
 493                           Output_section* output_section,
 494                           bool needs_special_offset_handling,
 495                           size_t local_symbol_count,
 496                           const unsigned char* plocal_symbols,
 497                           Relocatable_relocs*);
 498
 499   // Emit relocations for a section.
 500   void
 501   relocate_relocs(
 502       const Relocate_info<size, false>*,
 503       unsigned int sh_type,
 504       const unsigned char* prelocs,
 505       size_t reloc_count,
 506       Output_section* output_section,
 507       typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
 508       const Relocatable_relocs*,
 509       unsigned char* view,
 510       typename elfcpp::Elf_types<size>::Elf_Addr view_address,
 511       section_size_type view_size,
 512       unsigned char* reloc_view,
 513       section_size_type reloc_view_size);
 514
 515   // Return a string used to fill a code section with nops.
 516   std::string
 517   do_code_fill(section_size_type length) const;
 518
 519   // Return whether SYM is defined by the ABI.
 520   bool
 521   do_is_defined_by_abi(const Symbol* sym) const
 522   { return strcmp(sym->name(), "__tls_get_addr") == 0; }
 523
 524   // Return the symbol index to use for a target specific relocation.
 525   // The only target specific relocation is R_X86_64_TLSDESC for a
 526   // local symbol, which is an absolute reloc.
 527   unsigned int
 528   do_reloc_symbol_index(void*, unsigned int r_type) const
 529   {
 530     gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
 531     return 0;
 532   }
 533
 534   // Return the addend to use for a target specific relocation.
 535   uint64_t
 536   do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
 537
 538   // Return the PLT section.
 539   uint64_t
 540   do_plt_address_for_global(const Symbol* gsym) const
 541   { return this->plt_section()->address_for_global(gsym); }
 542
 543   uint64_t
 544   do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
 545   { return this->plt_section()->address_for_local(relobj, symndx); }
 546
 547   // This function should be defined in targets that can use relocation
 548   // types to determine (implemented in local_reloc_may_be_function_pointer
 549   // and global_reloc_may_be_function_pointer)
 550   // if a function's pointer is taken.  ICF uses this in safe mode to only
 551   // fold those functions whose pointer is defintely not taken.  For x86_64
 552   // pie binaries, safe ICF cannot be done by looking at relocation types.
 553   bool
 554   do_can_check_for_function_pointers() const
 555   { return !parameters->options().pie(); }
 556
 557   // Return the base for a DW_EH_PE_datarel encoding.
 558   uint64_t
 559   do_ehframe_datarel_base() const;
 560
 561   // Adjust -fsplit-stack code which calls non-split-stack code.
 562   void
 563   do_calls_non_split(Relobj* object, unsigned int shndx,
 564                      section_offset_type fnoffset, section_size_type fnsize,
 565                      unsigned char* view, section_size_type view_size,
 566                      std::string* from, std::string* to) const;
 567
 568   // Return the size of the GOT section.
 569   section_size_type
 570   got_size() const
 571   {
 572     gold_assert(this->got_ != NULL);
 573     return this->got_->data_size();
 574   }
 575
 576   // Return the number of entries in the GOT.
 577   unsigned int
 578   got_entry_count() const
 579   {
 580     if (this->got_ == NULL)
 581       return 0;
 582     return this->got_size() / 8;
 583   }
 584
 585   // Return the number of entries in the PLT.
 586   unsigned int
 587   plt_entry_count() const;
 588
 589   // Return the offset of the first non-reserved PLT entry.
 590   unsigned int
 591   first_plt_entry_offset() const;
 592
 593   // Return the size of each PLT entry.
 594   unsigned int
 595   plt_entry_size() const;
 596
 597   // Create the GOT section for an incremental update.
 598   Output_data_got_base*
 599   init_got_plt_for_update(Symbol_table* symtab,
 600                           Layout* layout,
 601                           unsigned int got_count,
 602                           unsigned int plt_count);
 603
 604   // Reserve a GOT entry for a local symbol, and regenerate any
 605   // necessary dynamic relocations.
 606   void
 607   reserve_local_got_entry(unsigned int got_index,
 608                           Sized_relobj<size, false>* obj,
 609                           unsigned int r_sym,
 610                           unsigned int got_type);
 611
 612   // Reserve a GOT entry for a global symbol, and regenerate any
 613   // necessary dynamic relocations.
 614   void
 615   reserve_global_got_entry(unsigned int got_index, Symbol* gsym,
 616                            unsigned int got_type);
 617
 618   // Register an existing PLT entry for a global symbol.
 619   void
 620   register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index,
 621                             Symbol* gsym);
 622
 623   // Force a COPY relocation for a given symbol.
 624   void
 625   emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t);
 626
 627   // Apply an incremental relocation.
 628   void
 629   apply_relocation(const Relocate_info<size, false>* relinfo,
 630                    typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
 631                    unsigned int r_type,
 632                    typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
 633                    const Symbol* gsym,
 634                    unsigned char* view,
 635                    typename elfcpp::Elf_types<size>::Elf_Addr address,
 636                    section_size_type view_size);
 637
 638   // Add a new reloc argument, returning the index in the vector.
 639   size_t
 640   add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym)
 641   {
 642     this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym));
 643     return this->tlsdesc_reloc_info_.size() - 1;
 644   }
 645
 646   Output_data_plt_x86_64<size>*
 647   make_data_plt(Layout* layout,
 648                 Output_data_got<64, false>* got,
 649                 Output_data_got_plt_x86_64* got_plt,
 650                 Output_data_space* got_irelative)
 651   {
 652     return this->do_make_data_plt(layout, got, got_plt, got_irelative);
 653   }
 654
 655   Output_data_plt_x86_64<size>*
 656   make_data_plt(Layout* layout,
 657                 Output_data_got<64, false>* got,
 658                 Output_data_got_plt_x86_64* got_plt,
 659                 Output_data_space* got_irelative,
 660                 unsigned int plt_count)
 661   {
 662     return this->do_make_data_plt(layout, got, got_plt, got_irelative,
 663                                   plt_count);
 664   }
 665
 666   virtual Output_data_plt_x86_64<size>*
 667   do_make_data_plt(Layout* layout,
 668                    Output_data_got<64, false>* got,
 669                    Output_data_got_plt_x86_64* got_plt,
 670                    Output_data_space* got_irelative)
 671   {
 672     return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
 673                                                      got_irelative);
 674   }
 675
 676   virtual Output_data_plt_x86_64<size>*
 677   do_make_data_plt(Layout* layout,
 678                    Output_data_got<64, false>* got,
 679                    Output_data_got_plt_x86_64* got_plt,
 680                    Output_data_space* got_irelative,
 681                    unsigned int plt_count)
 682   {
 683     return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
 684                                                      got_irelative,
 685                                                      plt_count);
 686   }
 687
 688  private:
 689   // The class which scans relocations.
 690   class Scan
 691   {
 692   public:
 693     Scan()
 694       : issued_non_pic_error_(false)
 695     { }
 696
 697     static inline int
 698     get_reference_flags(unsigned int r_type);
 699
 700     inline void
 701     local(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
 702           Sized_relobj_file<size, false>* object,
 703           unsigned int data_shndx,
 704           Output_section* output_section,
 705           const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
 706           const elfcpp::Sym<size, false>& lsym,
 707           bool is_discarded);
 708
 709     inline void
 710     global(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
 711            Sized_relobj_file<size, false>* object,
 712            unsigned int data_shndx,
 713            Output_section* output_section,
 714            const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
 715            Symbol* gsym);
 716
 717     inline bool
 718     local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
 719                                         Target_x86_64* target,
 720                                         Sized_relobj_file<size, false>* object,
 721                                         unsigned int data_shndx,
 722                                         Output_section* output_section,
 723                                         const elfcpp::Rela<size, false>& reloc,
 724                                         unsigned int r_type,
 725                                         const elfcpp::Sym<size, false>& lsym);
 726
 727     inline bool
 728     global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
 729                                          Target_x86_64* target,
 730                                          Sized_relobj_file<size, false>* object,
 731                                          unsigned int data_shndx,
 732                                          Output_section* output_section,
 733                                          const elfcpp::Rela<size, false>& reloc,
 734                                          unsigned int r_type,
 735                                          Symbol* gsym);
 736
 737   private:
 738     static void
 739     unsupported_reloc_local(Sized_relobj_file<size, false>*,
 740                             unsigned int r_type);
 741
 742     static void
 743     unsupported_reloc_global(Sized_relobj_file<size, false>*,
 744                              unsigned int r_type, Symbol*);
 745
 746     void
 747     check_non_pic(Relobj*, unsigned int r_type, Symbol*);
 748
 749     inline bool
 750     possible_function_pointer_reloc(unsigned int r_type);
 751
 752     bool
 753     reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*,
 754                               unsigned int r_type);
 755
 756     // Whether we have issued an error about a non-PIC compilation.
 757     bool issued_non_pic_error_;
 758   };
 759
 760   // The class which implements relocation.
 761   class Relocate
 762   {
 763    public:
 764     Relocate()
 765       : skip_call_tls_get_addr_(false)
 766     { }
 767
 768     ~Relocate()
 769     {
 770       if (this->skip_call_tls_get_addr_)
 771         {
 772           // FIXME: This needs to specify the location somehow.
 773           gold_error(_("missing expected TLS relocation"));
 774         }
 775     }
 776
 777     // Do a relocation.  Return false if the caller should not issue
 778     // any warnings about this relocation.
 779     inline bool
 780     relocate(const Relocate_info<size, false>*, Target_x86_64*,
 781              Output_section*,
 782              size_t relnum, const elfcpp::Rela<size, false>&,
 783              unsigned int r_type, const Sized_symbol<size>*,
 784              const Symbol_value<size>*,
 785              unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
 786              section_size_type);
 787
 788    private:
 789     // Do a TLS relocation.
 790     inline void
 791     relocate_tls(const Relocate_info<size, false>*, Target_x86_64*,
 792                  size_t relnum, const elfcpp::Rela<size, false>&,
 793                  unsigned int r_type, const Sized_symbol<size>*,
 794                  const Symbol_value<size>*,
 795                  unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
 796                  section_size_type);
 797
 798     // Do a TLS General-Dynamic to Initial-Exec transition.
 799     inline void
 800     tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
 801                  Output_segment* tls_segment,
 802                  const elfcpp::Rela<size, false>&, unsigned int r_type,
 803                  typename elfcpp::Elf_types<size>::Elf_Addr value,
 804                  unsigned char* view,
 805                  typename elfcpp::Elf_types<size>::Elf_Addr,
 806                  section_size_type view_size);
 807
 808     // Do a TLS General-Dynamic to Local-Exec transition.
 809     inline void
 810     tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
 811                  Output_segment* tls_segment,
 812                  const elfcpp::Rela<size, false>&, unsigned int r_type,
 813                  typename elfcpp::Elf_types<size>::Elf_Addr value,
 814                  unsigned char* view,
 815                  section_size_type view_size);
 816
 817     // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
 818     inline void
 819     tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
 820                       Output_segment* tls_segment,
 821                       const elfcpp::Rela<size, false>&, unsigned int r_type,
 822                       typename elfcpp::Elf_types<size>::Elf_Addr value,
 823                       unsigned char* view,
 824                       typename elfcpp::Elf_types<size>::Elf_Addr,
 825                       section_size_type view_size);
 826
 827     // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
 828     inline void
 829     tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
 830                       Output_segment* tls_segment,
 831                       const elfcpp::Rela<size, false>&, unsigned int r_type,
 832                       typename elfcpp::Elf_types<size>::Elf_Addr value,
 833                       unsigned char* view,
 834                       section_size_type view_size);
 835
 836     // Do a TLS Local-Dynamic to Local-Exec transition.
 837     inline void
 838     tls_ld_to_le(const Relocate_info<size, false>*, size_t relnum,
 839                  Output_segment* tls_segment,
 840                  const elfcpp::Rela<size, false>&, unsigned int r_type,
 841                  typename elfcpp::Elf_types<size>::Elf_Addr value,
 842                  unsigned char* view,
 843                  section_size_type view_size);
 844
 845     // Do a TLS Initial-Exec to Local-Exec transition.
 846     static inline void
 847     tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum,
 848                  Output_segment* tls_segment,
 849                  const elfcpp::Rela<size, false>&, unsigned int r_type,
 850                  typename elfcpp::Elf_types<size>::Elf_Addr value,
 851                  unsigned char* view,
 852                  section_size_type view_size);
 853
 854     // This is set if we should skip the next reloc, which should be a
 855     // PLT32 reloc against ___tls_get_addr.
 856     bool skip_call_tls_get_addr_;
 857   };
 858
 859   // A class which returns the size required for a relocation type,
 860   // used while scanning relocs during a relocatable link.
 861   class Relocatable_size_for_reloc
 862   {
 863    public:
 864     unsigned int
 865     get_size_for_reloc(unsigned int, Relobj*);
 866   };
 867
 868   // Adjust TLS relocation type based on the options and whether this
 869   // is a local symbol.
 870   static tls::Tls_optimization
 871   optimize_tls_reloc(bool is_final, int r_type);
 872
 873   // Get the GOT section, creating it if necessary.
 874   Output_data_got<64, false>*
 875   got_section(Symbol_table*, Layout*);
 876
 877   // Get the GOT PLT section.
 878   Output_data_got_plt_x86_64*
 879   got_plt_section() const
 880   {
 881     gold_assert(this->got_plt_ != NULL);
 882     return this->got_plt_;
 883   }
 884
 885   // Get the GOT section for TLSDESC entries.
 886   Output_data_got<64, false>*
 887   got_tlsdesc_section() const
 888   {
 889     gold_assert(this->got_tlsdesc_ != NULL);
 890     return this->got_tlsdesc_;
 891   }
 892
 893   // Create the PLT section.
 894   void
 895   make_plt_section(Symbol_table* symtab, Layout* layout);
 896
 897   // Create a PLT entry for a global symbol.
 898   void
 899   make_plt_entry(Symbol_table*, Layout*, Symbol*);
 900
 901   // Create a PLT entry for a local STT_GNU_IFUNC symbol.
 902   void
 903   make_local_ifunc_plt_entry(Symbol_table*, Layout*,
 904                              Sized_relobj_file<size, false>* relobj,
 905                              unsigned int local_sym_index);
 906
 907   // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
 908   void
 909   define_tls_base_symbol(Symbol_table*, Layout*);
 910
 911   // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
 912   void
 913   reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout);
 914
 915   // Create a GOT entry for the TLS module index.
 916   unsigned int
 917   got_mod_index_entry(Symbol_table* symtab, Layout* layout,
 918                       Sized_relobj_file<size, false>* object);
 919
 920   // Get the PLT section.
 921   Output_data_plt_x86_64<size>*
 922   plt_section() const
 923   {
 924     gold_assert(this->plt_ != NULL);
 925     return this->plt_;
 926   }
 927
 928   // Get the dynamic reloc section, creating it if necessary.
 929   Reloc_section*
 930   rela_dyn_section(Layout*);
 931
 932   // Get the section to use for TLSDESC relocations.
 933   Reloc_section*
 934   rela_tlsdesc_section(Layout*) const;
 935
 936   // Get the section to use for IRELATIVE relocations.
 937   Reloc_section*
 938   rela_irelative_section(Layout*);
 939
 940   // Add a potential copy relocation.
 941   void
 942   copy_reloc(Symbol_table* symtab, Layout* layout,
 943              Sized_relobj_file<size, false>* object,
 944              unsigned int shndx, Output_section* output_section,
 945              Symbol* sym, const elfcpp::Rela<size, false>& reloc)
 946   {
 947     this->copy_relocs_.copy_reloc(symtab, layout,
 948                                   symtab->get_sized_symbol<size>(sym),
 949                                   object, shndx, output_section,
 950                                   reloc, this->rela_dyn_section(layout));
 951   }
 952
 953   // Information about this specific target which we pass to the
 954   // general Target structure.
 955   static const Target::Target_info x86_64_info;
 956
 957   // The types of GOT entries needed for this platform.
 958   // These values are exposed to the ABI in an incremental link.
 959   // Do not renumber existing values without changing the version
 960   // number of the .gnu_incremental_inputs section.
 961   enum Got_type
 962   {
 963     GOT_TYPE_STANDARD = 0,      // GOT entry for a regular symbol
 964     GOT_TYPE_TLS_OFFSET = 1,    // GOT entry for TLS offset
 965     GOT_TYPE_TLS_PAIR = 2,      // GOT entry for TLS module/offset pair
 966     GOT_TYPE_TLS_DESC = 3       // GOT entry for TLS_DESC pair
 967   };
 968
 969   // This type is used as the argument to the target specific
 970   // relocation routines.  The only target specific reloc is
 971   // R_X86_64_TLSDESC against a local symbol.
 972   struct Tlsdesc_info
 973   {
 974     Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym)
 975       : object(a_object), r_sym(a_r_sym)
 976     { }
 977
 978     // The object in which the local symbol is defined.
 979     Sized_relobj_file<size, false>* object;
 980     // The local symbol index in the object.
 981     unsigned int r_sym;
 982   };
 983
 984   // The GOT section.
 985   Output_data_got<64, false>* got_;
 986   // The PLT section.
 987   Output_data_plt_x86_64<size>* plt_;
 988   // The GOT PLT section.
 989   Output_data_got_plt_x86_64* got_plt_;
 990   // The GOT section for IRELATIVE relocations.
 991   Output_data_space* got_irelative_;
 992   // The GOT section for TLSDESC relocations.
 993   Output_data_got<64, false>* got_tlsdesc_;
 994   // The _GLOBAL_OFFSET_TABLE_ symbol.
 995   Symbol* global_offset_table_;
 996   // The dynamic reloc section.
 997   Reloc_section* rela_dyn_;
 998   // The section to use for IRELATIVE relocs.
 999   Reloc_section* rela_irelative_;
1000   // Relocs saved to avoid a COPY reloc.
1001   Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_;
1002   // Offset of the GOT entry for the TLS module index.
1003   unsigned int got_mod_index_offset_;
1004   // We handle R_X86_64_TLSDESC against a local symbol as a target
1005   // specific relocation.  Here we store the object and local symbol
1006   // index for the relocation.
1007   std::vector<Tlsdesc_info> tlsdesc_reloc_info_;
1008   // True if the _TLS_MODULE_BASE_ symbol has been defined.
1009   bool tls_base_symbol_defined_;
1010 };
1011
1012 template<>
1013 const Target::Target_info Target_x86_64<64>::x86_64_info =
1014 {
1015   64,                   // size
1016   false,                // is_big_endian
1017   elfcpp::EM_X86_64,    // machine_code
1018   false,                // has_make_symbol
1019   false,                // has_resolve
1020   true,                 // has_code_fill
1021   true,                 // is_default_stack_executable
1022   true,                 // can_icf_inline_merge_sections
1023   '\0',                 // wrap_char
1024   "/lib/ld64.so.1",     // program interpreter
1025   0x400000,             // default_text_segment_address
1026   0x1000,               // abi_pagesize (overridable by -z max-page-size)
1027   0x1000,               // common_pagesize (overridable by -z common-page-size)
1028   false,                // isolate_execinstr
1029   0,                    // rosegment_gap
1030   elfcpp::SHN_UNDEF,    // small_common_shndx
1031   elfcpp::SHN_X86_64_LCOMMON,   // large_common_shndx
1032   0,                    // small_common_section_flags
1033   elfcpp::SHF_X86_64_LARGE,     // large_common_section_flags
1034   NULL,                 // attributes_section
1035   NULL,                 // attributes_vendor
1036   "_start"              // entry_symbol_name
1037 };
1038
1039 template<>
1040 const Target::Target_info Target_x86_64<32>::x86_64_info =
1041 {
1042   32,                   // size
1043   false,                // is_big_endian
1044   elfcpp::EM_X86_64,    // machine_code
1045   false,                // has_make_symbol
1046   false,                // has_resolve
1047   true,                 // has_code_fill
1048   true,                 // is_default_stack_executable
1049   true,                 // can_icf_inline_merge_sections
1050   '\0',                 // wrap_char
1051   "/libx32/ldx32.so.1", // program interpreter
1052   0x400000,             // default_text_segment_address
1053   0x1000,               // abi_pagesize (overridable by -z max-page-size)
1054   0x1000,               // common_pagesize (overridable by -z common-page-size)
1055   false,                // isolate_execinstr
1056   0,                    // rosegment_gap
1057   elfcpp::SHN_UNDEF,    // small_common_shndx
1058   elfcpp::SHN_X86_64_LCOMMON,   // large_common_shndx
1059   0,                    // small_common_section_flags
1060   elfcpp::SHF_X86_64_LARGE,     // large_common_section_flags
1061   NULL,                 // attributes_section
1062   NULL,                 // attributes_vendor
1063   "_start"              // entry_symbol_name
1064 };
1065
1066 // This is called when a new output section is created.  This is where
1067 // we handle the SHF_X86_64_LARGE.
1068
1069 template<int size>
1070 void
1071 Target_x86_64<size>::do_new_output_section(Output_section* os) const
1072 {
1073   if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0)
1074     os->set_is_large_section();
1075 }
1076
1077 // Get the GOT section, creating it if necessary.
1078
1079 template<int size>
1080 Output_data_got<64, false>*
1081 Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout)
1082 {
1083   if (this->got_ == NULL)
1084     {
1085       gold_assert(symtab != NULL && layout != NULL);
1086
1087       // When using -z now, we can treat .got.plt as a relro section.
1088       // Without -z now, it is modified after program startup by lazy
1089       // PLT relocations.
1090       bool is_got_plt_relro = parameters->options().now();
1091       Output_section_order got_order = (is_got_plt_relro
1092                                         ? ORDER_RELRO
1093                                         : ORDER_RELRO_LAST);
1094       Output_section_order got_plt_order = (is_got_plt_relro
1095                                             ? ORDER_RELRO
1096                                             : ORDER_NON_RELRO_FIRST);
1097
1098       this->got_ = new Output_data_got<64, false>();
1099
1100       layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1101                                       (elfcpp::SHF_ALLOC
1102                                        | elfcpp::SHF_WRITE),
1103                                       this->got_, got_order, true);
1104
1105       this->got_plt_ = new Output_data_got_plt_x86_64(layout);
1106       layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1107                                       (elfcpp::SHF_ALLOC
1108                                        | elfcpp::SHF_WRITE),
1109                                       this->got_plt_, got_plt_order,
1110                                       is_got_plt_relro);
1111
1112       // The first three entries are reserved.
1113       this->got_plt_->set_current_data_size(3 * 8);
1114
1115       if (!is_got_plt_relro)
1116         {
1117           // Those bytes can go into the relro segment.
1118           layout->increase_relro(3 * 8);
1119         }
1120
1121       // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1122       this->global_offset_table_ =
1123         symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1124                                       Symbol_table::PREDEFINED,
1125                                       this->got_plt_,
1126                                       0, 0, elfcpp::STT_OBJECT,
1127                                       elfcpp::STB_LOCAL,
1128                                       elfcpp::STV_HIDDEN, 0,
1129                                       false, false);
1130
1131       // If there are any IRELATIVE relocations, they get GOT entries
1132       // in .got.plt after the jump slot entries.
1133       this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT");
1134       layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1135                                       (elfcpp::SHF_ALLOC
1136                                        | elfcpp::SHF_WRITE),
1137                                       this->got_irelative_,
1138                                       got_plt_order, is_got_plt_relro);
1139
1140       // If there are any TLSDESC relocations, they get GOT entries in
1141       // .got.plt after the jump slot and IRELATIVE entries.
1142       this->got_tlsdesc_ = new Output_data_got<64, false>();
1143       layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1144                                       (elfcpp::SHF_ALLOC
1145                                        | elfcpp::SHF_WRITE),
1146                                       this->got_tlsdesc_,
1147                                       got_plt_order, is_got_plt_relro);
1148     }
1149
1150   return this->got_;
1151 }
1152
1153 // Get the dynamic reloc section, creating it if necessary.
1154
1155 template<int size>
1156 typename Target_x86_64<size>::Reloc_section*
1157 Target_x86_64<size>::rela_dyn_section(Layout* layout)
1158 {
1159   if (this->rela_dyn_ == NULL)
1160     {
1161       gold_assert(layout != NULL);
1162       this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
1163       layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
1164                                       elfcpp::SHF_ALLOC, this->rela_dyn_,
1165                                       ORDER_DYNAMIC_RELOCS, false);
1166     }
1167   return this->rela_dyn_;
1168 }
1169
1170 // Get the section to use for IRELATIVE relocs, creating it if
1171 // necessary.  These go in .rela.dyn, but only after all other dynamic
1172 // relocations.  They need to follow the other dynamic relocations so
1173 // that they can refer to global variables initialized by those
1174 // relocs.
1175
1176 template<int size>
1177 typename Target_x86_64<size>::Reloc_section*
1178 Target_x86_64<size>::rela_irelative_section(Layout* layout)
1179 {
1180   if (this->rela_irelative_ == NULL)
1181     {
1182       // Make sure we have already created the dynamic reloc section.
1183       this->rela_dyn_section(layout);
1184       this->rela_irelative_ = new Reloc_section(false);
1185       layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
1186                                       elfcpp::SHF_ALLOC, this->rela_irelative_,
1187                                       ORDER_DYNAMIC_RELOCS, false);
1188       gold_assert(this->rela_dyn_->output_section()
1189                   == this->rela_irelative_->output_section());
1190     }
1191   return this->rela_irelative_;
1192 }
1193
1194 // Write the first three reserved words of the .got.plt section.
1195 // The remainder of the section is written while writing the PLT
1196 // in Output_data_plt_i386::do_write.
1197
1198 void
1199 Output_data_got_plt_x86_64::do_write(Output_file* of)
1200 {
1201   // The first entry in the GOT is the address of the .dynamic section
1202   // aka the PT_DYNAMIC segment.  The next two entries are reserved.
1203   // We saved space for them when we created the section in
1204   // Target_x86_64::got_section.
1205   const off_t got_file_offset = this->offset();
1206   gold_assert(this->data_size() >= 24);
1207   unsigned char* const got_view = of->get_output_view(got_file_offset, 24);
1208   Output_section* dynamic = this->layout_->dynamic_section();
1209   uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
1210   elfcpp::Swap<64, false>::writeval(got_view, dynamic_addr);
1211   memset(got_view + 8, 0, 16);
1212   of->write_output_view(got_file_offset, 24, got_view);
1213 }
1214
1215 // Initialize the PLT section.
1216
1217 template<int size>
1218 void
1219 Output_data_plt_x86_64<size>::init(Layout* layout)
1220 {
1221   this->rel_ = new Reloc_section(false);
1222   layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1223                                   elfcpp::SHF_ALLOC, this->rel_,
1224                                   ORDER_DYNAMIC_PLT_RELOCS, false);
1225 }
1226
1227 template<int size>
1228 void
1229 Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os)
1230 {
1231   os->set_entsize(this->get_plt_entry_size());
1232 }
1233
1234 // Add an entry to the PLT.
1235
1236 template<int size>
1237 void
1238 Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout,
1239                                         Symbol* gsym)
1240 {
1241   gold_assert(!gsym->has_plt_offset());
1242
1243   unsigned int plt_index;
1244   off_t plt_offset;
1245   section_offset_type got_offset;
1246
1247   unsigned int* pcount;
1248   unsigned int offset;
1249   unsigned int reserved;
1250   Output_section_data_build* got;
1251   if (gsym->type() == elfcpp::STT_GNU_IFUNC
1252       && gsym->can_use_relative_reloc(false))
1253     {
1254       pcount = &this->irelative_count_;
1255       offset = 0;
1256       reserved = 0;
1257       got = this->got_irelative_;
1258     }
1259   else
1260     {
1261       pcount = &this->count_;
1262       offset = 1;
1263       reserved = 3;
1264       got = this->got_plt_;
1265     }
1266
1267   if (!this->is_data_size_valid())
1268     {
1269       // Note that when setting the PLT offset for a non-IRELATIVE
1270       // entry we skip the initial reserved PLT entry.
1271       plt_index = *pcount + offset;
1272       plt_offset = plt_index * this->get_plt_entry_size();
1273
1274       ++*pcount;
1275
1276       got_offset = (plt_index - offset + reserved) * 8;
1277       gold_assert(got_offset == got->current_data_size());
1278
1279       // Every PLT entry needs a GOT entry which points back to the PLT
1280       // entry (this will be changed by the dynamic linker, normally
1281       // lazily when the function is called).
1282       got->set_current_data_size(got_offset + 8);
1283     }
1284   else
1285     {
1286       // FIXME: This is probably not correct for IRELATIVE relocs.
1287
1288       // For incremental updates, find an available slot.
1289       plt_offset = this->free_list_.allocate(this->get_plt_entry_size(),
1290                                              this->get_plt_entry_size(), 0);
1291       if (plt_offset == -1)
1292         gold_fallback(_("out of patch space (PLT);"
1293                         " relink with --incremental-full"));
1294
1295       // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
1296       // can be calculated from the PLT index, adjusting for the three
1297       // reserved entries at the beginning of the GOT.
1298       plt_index = plt_offset / this->get_plt_entry_size() - 1;
1299       got_offset = (plt_index - offset + reserved) * 8;
1300     }
1301
1302   gsym->set_plt_offset(plt_offset);
1303
1304   // Every PLT entry needs a reloc.
1305   this->add_relocation(symtab, layout, gsym, got_offset);
1306
1307   // Note that we don't need to save the symbol.  The contents of the
1308   // PLT are independent of which symbols are used.  The symbols only
1309   // appear in the relocations.
1310 }
1311
1312 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.  Return
1313 // the PLT offset.
1314
1315 template<int size>
1316 unsigned int
1317 Output_data_plt_x86_64<size>::add_local_ifunc_entry(
1318     Symbol_table* symtab,
1319     Layout* layout,
1320     Sized_relobj_file<size, false>* relobj,
1321     unsigned int local_sym_index)
1322 {
1323   unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size();
1324   ++this->irelative_count_;
1325
1326   section_offset_type got_offset = this->got_irelative_->current_data_size();
1327
1328   // Every PLT entry needs a GOT entry which points back to the PLT
1329   // entry.
1330   this->got_irelative_->set_current_data_size(got_offset + 8);
1331
1332   // Every PLT entry needs a reloc.
1333   Reloc_section* rela = this->rela_irelative(symtab, layout);
1334   rela->add_symbolless_local_addend(relobj, local_sym_index,
1335                                     elfcpp::R_X86_64_IRELATIVE,
1336                                     this->got_irelative_, got_offset, 0);
1337
1338   return plt_offset;
1339 }
1340
1341 // Add the relocation for a PLT entry.
1342
1343 template<int size>
1344 void
1345 Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab,
1346                                              Layout* layout,
1347                                              Symbol* gsym,
1348                                              unsigned int got_offset)
1349 {
1350   if (gsym->type() == elfcpp::STT_GNU_IFUNC
1351       && gsym->can_use_relative_reloc(false))
1352     {
1353       Reloc_section* rela = this->rela_irelative(symtab, layout);
1354       rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE,
1355                                          this->got_irelative_, got_offset, 0);
1356     }
1357   else
1358     {
1359       gsym->set_needs_dynsym_entry();
1360       this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_,
1361                              got_offset, 0);
1362     }
1363 }
1364
1365 // Return where the TLSDESC relocations should go, creating it if
1366 // necessary.  These follow the JUMP_SLOT relocations.
1367
1368 template<int size>
1369 typename Output_data_plt_x86_64<size>::Reloc_section*
1370 Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout)
1371 {
1372   if (this->tlsdesc_rel_ == NULL)
1373     {
1374       this->tlsdesc_rel_ = new Reloc_section(false);
1375       layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1376                                       elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
1377                                       ORDER_DYNAMIC_PLT_RELOCS, false);
1378       gold_assert(this->tlsdesc_rel_->output_section()
1379                   == this->rel_->output_section());
1380     }
1381   return this->tlsdesc_rel_;
1382 }
1383
1384 // Return where the IRELATIVE relocations should go in the PLT.  These
1385 // follow the JUMP_SLOT and the TLSDESC relocations.
1386
1387 template<int size>
1388 typename Output_data_plt_x86_64<size>::Reloc_section*
1389 Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab,
1390                                              Layout* layout)
1391 {
1392   if (this->irelative_rel_ == NULL)
1393     {
1394       // Make sure we have a place for the TLSDESC relocations, in
1395       // case we see any later on.
1396       this->rela_tlsdesc(layout);
1397       this->irelative_rel_ = new Reloc_section(false);
1398       layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1399                                       elfcpp::SHF_ALLOC, this->irelative_rel_,
1400                                       ORDER_DYNAMIC_PLT_RELOCS, false);
1401       gold_assert(this->irelative_rel_->output_section()
1402                   == this->rel_->output_section());
1403
1404       if (parameters->doing_static_link())
1405         {
1406           // A statically linked executable will only have a .rela.plt
1407           // section to hold R_X86_64_IRELATIVE relocs for
1408           // STT_GNU_IFUNC symbols.  The library will use these
1409           // symbols to locate the IRELATIVE relocs at program startup
1410           // time.
1411           symtab->define_in_output_data("__rela_iplt_start", NULL,
1412                                         Symbol_table::PREDEFINED,
1413                                         this->irelative_rel_, 0, 0,
1414                                         elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1415                                         elfcpp::STV_HIDDEN, 0, false, true);
1416           symtab->define_in_output_data("__rela_iplt_end", NULL,
1417                                         Symbol_table::PREDEFINED,
1418                                         this->irelative_rel_, 0, 0,
1419                                         elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1420                                         elfcpp::STV_HIDDEN, 0, true, true);
1421         }
1422     }
1423   return this->irelative_rel_;
1424 }
1425
1426 // Return the PLT address to use for a global symbol.
1427
1428 template<int size>
1429 uint64_t
1430 Output_data_plt_x86_64<size>::address_for_global(const Symbol* gsym)
1431 {
1432   uint64_t offset = 0;
1433   if (gsym->type() == elfcpp::STT_GNU_IFUNC
1434       && gsym->can_use_relative_reloc(false))
1435     offset = (this->count_ + 1) * this->get_plt_entry_size();
1436   return this->address() + offset + gsym->plt_offset();
1437 }
1438
1439 // Return the PLT address to use for a local symbol.  These are always
1440 // IRELATIVE relocs.
1441
1442 template<int size>
1443 uint64_t
1444 Output_data_plt_x86_64<size>::address_for_local(const Relobj* object,
1445                                                 unsigned int r_sym)
1446 {
1447   return (this->address()
1448           + (this->count_ + 1) * this->get_plt_entry_size()
1449           + object->local_plt_offset(r_sym));
1450 }
1451
1452 // Set the final size.
1453 template<int size>
1454 void
1455 Output_data_plt_x86_64<size>::set_final_data_size()
1456 {
1457   unsigned int count = this->count_ + this->irelative_count_;
1458   if (this->has_tlsdesc_entry())
1459     ++count;
1460   this->set_data_size((count + 1) * this->get_plt_entry_size());
1461 }
1462
1463 // The first entry in the PLT for an executable.
1464
1465 template<int size>
1466 const unsigned char
1467 Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] =
1468 {
1469   // From AMD64 ABI Draft 0.98, page 76
1470   0xff, 0x35,   // pushq contents of memory address
1471   0, 0, 0, 0,   // replaced with address of .got + 8
1472   0xff, 0x25,   // jmp indirect
1473   0, 0, 0, 0,   // replaced with address of .got + 16
1474   0x90, 0x90, 0x90, 0x90   // noop (x4)
1475 };
1476
1477 template<int size>
1478 void
1479 Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry(
1480     unsigned char* pov,
1481     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1482     typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
1483 {
1484   memcpy(pov, first_plt_entry, plt_entry_size);
1485   // We do a jmp relative to the PC at the end of this instruction.
1486   elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1487                                               (got_address + 8
1488                                                - (plt_address + 6)));
1489   elfcpp::Swap<32, false>::writeval(pov + 8,
1490                                     (got_address + 16
1491                                      - (plt_address + 12)));
1492 }
1493
1494 // Subsequent entries in the PLT for an executable.
1495
1496 template<int size>
1497 const unsigned char
1498 Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] =
1499 {
1500   // From AMD64 ABI Draft 0.98, page 76
1501   0xff, 0x25,   // jmpq indirect
1502   0, 0, 0, 0,   // replaced with address of symbol in .got
1503   0x68,         // pushq immediate
1504   0, 0, 0, 0,   // replaced with offset into relocation table
1505   0xe9,         // jmpq relative
1506   0, 0, 0, 0    // replaced with offset to start of .plt
1507 };
1508
1509 template<int size>
1510 unsigned int
1511 Output_data_plt_x86_64_standard<size>::do_fill_plt_entry(
1512     unsigned char* pov,
1513     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1514     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
1515     unsigned int got_offset,
1516     unsigned int plt_offset,
1517     unsigned int plt_index)
1518 {
1519   memcpy(pov, plt_entry, plt_entry_size);
1520   elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1521                                               (got_address + got_offset
1522                                                - (plt_address + plt_offset
1523                                                   + 6)));
1524
1525   elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index);
1526   elfcpp::Swap<32, false>::writeval(pov + 12,
1527                                     - (plt_offset + plt_entry_size));
1528
1529   return 6;
1530 }
1531
1532 // The reserved TLSDESC entry in the PLT for an executable.
1533
1534 template<int size>
1535 const unsigned char
1536 Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] =
1537 {
1538   // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
1539   // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
1540   0xff, 0x35,   // pushq x(%rip)
1541   0, 0, 0, 0,   // replaced with address of linkmap GOT entry (at PLTGOT + 8)
1542   0xff, 0x25,   // jmpq *y(%rip)
1543   0, 0, 0, 0,   // replaced with offset of reserved TLSDESC_GOT entry
1544   0x0f, 0x1f,   // nop
1545   0x40, 0
1546 };
1547
1548 template<int size>
1549 void
1550 Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry(
1551     unsigned char* pov,
1552     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1553     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
1554     typename elfcpp::Elf_types<size>::Elf_Addr got_base,
1555     unsigned int tlsdesc_got_offset,
1556     unsigned int plt_offset)
1557 {
1558   memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
1559   elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1560                                               (got_address + 8
1561                                                - (plt_address + plt_offset
1562                                                   + 6)));
1563   elfcpp::Swap_unaligned<32, false>::writeval(pov + 8,
1564                                               (got_base
1565                                                + tlsdesc_got_offset
1566                                                - (plt_address + plt_offset
1567                                                   + 12)));
1568 }
1569
1570 // The .eh_frame unwind information for the PLT.
1571
1572 template<int size>
1573 const unsigned char
1574 Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] =
1575 {
1576   1,                            // CIE version.
1577   'z',                          // Augmentation: augmentation size included.
1578   'R',                          // Augmentation: FDE encoding included.
1579   '\0',                         // End of augmentation string.
1580   1,                            // Code alignment factor.
1581   0x78,                         // Data alignment factor.
1582   16,                           // Return address column.
1583   1,                            // Augmentation size.
1584   (elfcpp::DW_EH_PE_pcrel       // FDE encoding.
1585    | elfcpp::DW_EH_PE_sdata4),
1586   elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8.
1587   elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8.
1588   elfcpp::DW_CFA_nop,           // Align to 16 bytes.
1589   elfcpp::DW_CFA_nop
1590 };
1591
1592 template<int size>
1593 const unsigned char
1594 Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
1595 {
1596   0, 0, 0, 0,                           // Replaced with offset to .plt.
1597   0, 0, 0, 0,                           // Replaced with size of .plt.
1598   0,                                    // Augmentation size.
1599   elfcpp::DW_CFA_def_cfa_offset, 16,    // DW_CFA_def_cfa_offset: 16.
1600   elfcpp::DW_CFA_advance_loc + 6,       // Advance 6 to __PLT__ + 6.
1601   elfcpp::DW_CFA_def_cfa_offset, 24,    // DW_CFA_def_cfa_offset: 24.
1602   elfcpp::DW_CFA_advance_loc + 10,      // Advance 10 to __PLT__ + 16.
1603   elfcpp::DW_CFA_def_cfa_expression,    // DW_CFA_def_cfa_expression.
1604   11,                                   // Block length.
1605   elfcpp::DW_OP_breg7, 8,               // Push %rsp + 8.
1606   elfcpp::DW_OP_breg16, 0,              // Push %rip.
1607   elfcpp::DW_OP_lit15,                  // Push 0xf.
1608   elfcpp::DW_OP_and,                    // & (%rip & 0xf).
1609   elfcpp::DW_OP_lit11,                  // Push 0xb.
1610   elfcpp::DW_OP_ge,                     // >= ((%rip & 0xf) >= 0xb)
1611   elfcpp::DW_OP_lit3,                   // Push 3.
1612   elfcpp::DW_OP_shl,                    // << (((%rip & 0xf) >= 0xb) << 3)
1613   elfcpp::DW_OP_plus,                   // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8
1614   elfcpp::DW_CFA_nop,                   // Align to 32 bytes.
1615   elfcpp::DW_CFA_nop,
1616   elfcpp::DW_CFA_nop,
1617   elfcpp::DW_CFA_nop
1618 };
1619
1620 // Write out the PLT.  This uses the hand-coded instructions above,
1621 // and adjusts them as needed.  This is specified by the AMD64 ABI.
1622
1623 template<int size>
1624 void
1625 Output_data_plt_x86_64<size>::do_write(Output_file* of)
1626 {
1627   const off_t offset = this->offset();
1628   const section_size_type oview_size =
1629     convert_to_section_size_type(this->data_size());
1630   unsigned char* const oview = of->get_output_view(offset, oview_size);
1631
1632   const off_t got_file_offset = this->got_plt_->offset();
1633   gold_assert(parameters->incremental_update()
1634               || (got_file_offset + this->got_plt_->data_size()
1635                   == this->got_irelative_->offset()));
1636   const section_size_type got_size =
1637     convert_to_section_size_type(this->got_plt_->data_size()
1638                                  + this->got_irelative_->data_size());
1639   unsigned char* const got_view = of->get_output_view(got_file_offset,
1640                                                       got_size);
1641
1642   unsigned char* pov = oview;
1643
1644   // The base address of the .plt section.
1645   typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
1646   // The base address of the .got section.
1647   typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address();
1648   // The base address of the PLT portion of the .got section,
1649   // which is where the GOT pointer will point, and where the
1650   // three reserved GOT entries are located.
1651   typename elfcpp::Elf_types<size>::Elf_Addr got_address
1652     = this->got_plt_->address();
1653
1654   this->fill_first_plt_entry(pov, got_address, plt_address);
1655   pov += this->get_plt_entry_size();
1656
1657   // The first three entries in the GOT are reserved, and are written
1658   // by Output_data_got_plt_x86_64::do_write.
1659   unsigned char* got_pov = got_view + 24;
1660
1661   unsigned int plt_offset = this->get_plt_entry_size();
1662   unsigned int got_offset = 24;
1663   const unsigned int count = this->count_ + this->irelative_count_;
1664   for (unsigned int plt_index = 0;
1665        plt_index < count;
1666        ++plt_index,
1667          pov += this->get_plt_entry_size(),
1668          got_pov += 8,
1669          plt_offset += this->get_plt_entry_size(),
1670          got_offset += 8)
1671     {
1672       // Set and adjust the PLT entry itself.
1673       unsigned int lazy_offset = this->fill_plt_entry(pov,
1674                                                       got_address, plt_address,
1675                                                       got_offset, plt_offset,
1676                                                       plt_index);
1677
1678       // Set the entry in the GOT.
1679       elfcpp::Swap<64, false>::writeval(got_pov,
1680                                         plt_address + plt_offset + lazy_offset);
1681     }
1682
1683   if (this->has_tlsdesc_entry())
1684     {
1685       // Set and adjust the reserved TLSDESC PLT entry.
1686       unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
1687       this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
1688                                tlsdesc_got_offset, plt_offset);
1689       pov += this->get_plt_entry_size();
1690     }
1691
1692   gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
1693   gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
1694
1695   of->write_output_view(offset, oview_size, oview);
1696   of->write_output_view(got_file_offset, got_size, got_view);
1697 }
1698
1699 // Create the PLT section.
1700
1701 template<int size>
1702 void
1703 Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout)
1704 {
1705   if (this->plt_ == NULL)
1706     {
1707       // Create the GOT sections first.
1708       this->got_section(symtab, layout);
1709
1710       this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_,
1711                                        this->got_irelative_);
1712
1713       // Add unwind information if requested.
1714       if (parameters->options().ld_generated_unwind_info())
1715         this->plt_->add_eh_frame(layout);
1716
1717       layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1718                                       (elfcpp::SHF_ALLOC
1719                                        | elfcpp::SHF_EXECINSTR),
1720                                       this->plt_, ORDER_PLT, false);
1721
1722       // Make the sh_info field of .rela.plt point to .plt.
1723       Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
1724       rela_plt_os->set_info_section(this->plt_->output_section());
1725     }
1726 }
1727
1728 // Return the section for TLSDESC relocations.
1729
1730 template<int size>
1731 typename Target_x86_64<size>::Reloc_section*
1732 Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const
1733 {
1734   return this->plt_section()->rela_tlsdesc(layout);
1735 }
1736
1737 // Create a PLT entry for a global symbol.
1738
1739 template<int size>
1740 void
1741 Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout,
1742                                     Symbol* gsym)
1743 {
1744   if (gsym->has_plt_offset())
1745     return;
1746
1747   if (this->plt_ == NULL)
1748     this->make_plt_section(symtab, layout);
1749
1750   this->plt_->add_entry(symtab, layout, gsym);
1751 }
1752
1753 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
1754
1755 template<int size>
1756 void
1757 Target_x86_64<size>::make_local_ifunc_plt_entry(
1758     Symbol_table* symtab, Layout* layout,
1759     Sized_relobj_file<size, false>* relobj,
1760     unsigned int local_sym_index)
1761 {
1762   if (relobj->local_has_plt_offset(local_sym_index))
1763     return;
1764   if (this->plt_ == NULL)
1765     this->make_plt_section(symtab, layout);
1766   unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
1767                                                               relobj,
1768                                                               local_sym_index);
1769   relobj->set_local_plt_offset(local_sym_index, plt_offset);
1770 }
1771
1772 // Return the number of entries in the PLT.
1773
1774 template<int size>
1775 unsigned int
1776 Target_x86_64<size>::plt_entry_count() const
1777 {
1778   if (this->plt_ == NULL)
1779     return 0;
1780   return this->plt_->entry_count();
1781 }
1782
1783 // Return the offset of the first non-reserved PLT entry.
1784
1785 template<int size>
1786 unsigned int
1787 Target_x86_64<size>::first_plt_entry_offset() const
1788 {
1789   return this->plt_->first_plt_entry_offset();
1790 }
1791
1792 // Return the size of each PLT entry.
1793
1794 template<int size>
1795 unsigned int
1796 Target_x86_64<size>::plt_entry_size() const
1797 {
1798   return this->plt_->get_plt_entry_size();
1799 }
1800
1801 // Create the GOT and PLT sections for an incremental update.
1802
1803 template<int size>
1804 Output_data_got_base*
1805 Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab,
1806                                        Layout* layout,
1807                                        unsigned int got_count,
1808                                        unsigned int plt_count)
1809 {
1810   gold_assert(this->got_ == NULL);
1811
1812   this->got_ = new Output_data_got<64, false>(got_count * 8);
1813   layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1814                                   (elfcpp::SHF_ALLOC
1815                                    | elfcpp::SHF_WRITE),
1816                                   this->got_, ORDER_RELRO_LAST,
1817                                   true);
1818
1819   // Add the three reserved entries.
1820   this->got_plt_ = new Output_data_got_plt_x86_64(layout, (plt_count + 3) * 8);
1821   layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1822                                   (elfcpp::SHF_ALLOC
1823                                    | elfcpp::SHF_WRITE),
1824                                   this->got_plt_, ORDER_NON_RELRO_FIRST,
1825                                   false);
1826
1827   // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1828   this->global_offset_table_ =
1829     symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1830                                   Symbol_table::PREDEFINED,
1831                                   this->got_plt_,
1832                                   0, 0, elfcpp::STT_OBJECT,
1833                                   elfcpp::STB_LOCAL,
1834                                   elfcpp::STV_HIDDEN, 0,
1835                                   false, false);
1836
1837   // If there are any TLSDESC relocations, they get GOT entries in
1838   // .got.plt after the jump slot entries.
1839   // FIXME: Get the count for TLSDESC entries.
1840   this->got_tlsdesc_ = new Output_data_got<64, false>(0);
1841   layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1842                                   elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
1843                                   this->got_tlsdesc_,
1844                                   ORDER_NON_RELRO_FIRST, false);
1845
1846   // If there are any IRELATIVE relocations, they get GOT entries in
1847   // .got.plt after the jump slot and TLSDESC entries.
1848   this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT");
1849   layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1850                                   elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
1851                                   this->got_irelative_,
1852                                   ORDER_NON_RELRO_FIRST, false);
1853
1854   // Create the PLT section.
1855   this->plt_ = this->make_data_plt(layout, this->got_,
1856                                    this->got_plt_,
1857                                    this->got_irelative_,
1858                                    plt_count);
1859
1860   // Add unwind information if requested.
1861   if (parameters->options().ld_generated_unwind_info())
1862     this->plt_->add_eh_frame(layout);
1863
1864   layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1865                                   elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
1866                                   this->plt_, ORDER_PLT, false);
1867
1868   // Make the sh_info field of .rela.plt point to .plt.
1869   Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
1870   rela_plt_os->set_info_section(this->plt_->output_section());
1871
1872   // Create the rela_dyn section.
1873   this->rela_dyn_section(layout);
1874
1875   return this->got_;
1876 }
1877
1878 // Reserve a GOT entry for a local symbol, and regenerate any
1879 // necessary dynamic relocations.
1880
1881 template<int size>
1882 void
1883 Target_x86_64<size>::reserve_local_got_entry(
1884     unsigned int got_index,
1885     Sized_relobj<size, false>* obj,
1886     unsigned int r_sym,
1887     unsigned int got_type)
1888 {
1889   unsigned int got_offset = got_index * 8;
1890   Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
1891
1892   this->got_->reserve_local(got_index, obj, r_sym, got_type);
1893   switch (got_type)
1894     {
1895     case GOT_TYPE_STANDARD:
1896       if (parameters->options().output_is_position_independent())
1897         rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE,
1898                                      this->got_, got_offset, 0, false);
1899       break;
1900     case GOT_TYPE_TLS_OFFSET:
1901       rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64,
1902                           this->got_, got_offset, 0);
1903       break;
1904     case GOT_TYPE_TLS_PAIR:
1905       this->got_->reserve_slot(got_index + 1);
1906       rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64,
1907                           this->got_, got_offset, 0);
1908       break;
1909     case GOT_TYPE_TLS_DESC:
1910       gold_fatal(_("TLS_DESC not yet supported for incremental linking"));
1911       // this->got_->reserve_slot(got_index + 1);
1912       // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
1913       //                               this->got_, got_offset, 0);
1914       break;
1915     default:
1916       gold_unreachable();
1917     }
1918 }
1919
1920 // Reserve a GOT entry for a global symbol, and regenerate any
1921 // necessary dynamic relocations.
1922
1923 template<int size>
1924 void
1925 Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index,
1926                                               Symbol* gsym,
1927                                               unsigned int got_type)
1928 {
1929   unsigned int got_offset = got_index * 8;
1930   Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
1931
1932   this->got_->reserve_global(got_index, gsym, got_type);
1933   switch (got_type)
1934     {
1935     case GOT_TYPE_STANDARD:
1936       if (!gsym->final_value_is_known())
1937         {
1938           if (gsym->is_from_dynobj()
1939               || gsym->is_undefined()
1940               || gsym->is_preemptible()
1941               || gsym->type() == elfcpp::STT_GNU_IFUNC)
1942             rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT,
1943                                  this->got_, got_offset, 0);
1944           else
1945             rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
1946                                           this->got_, got_offset, 0, false);
1947         }
1948       break;
1949     case GOT_TYPE_TLS_OFFSET:
1950       rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64,
1951                                     this->got_, got_offset, 0, false);
1952       break;
1953     case GOT_TYPE_TLS_PAIR:
1954       this->got_->reserve_slot(got_index + 1);
1955       rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64,
1956                                     this->got_, got_offset, 0, false);
1957       rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64,
1958                                     this->got_, got_offset + 8, 0, false);
1959       break;
1960     case GOT_TYPE_TLS_DESC:
1961       this->got_->reserve_slot(got_index + 1);
1962       rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC,
1963                                     this->got_, got_offset, 0, false);
1964       break;
1965     default:
1966       gold_unreachable();
1967     }
1968 }
1969
1970 // Register an existing PLT entry for a global symbol.
1971
1972 template<int size>
1973 void
1974 Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab,
1975                                                Layout* layout,
1976                                                unsigned int plt_index,
1977                                                Symbol* gsym)
1978 {
1979   gold_assert(this->plt_ != NULL);
1980   gold_assert(!gsym->has_plt_offset());
1981
1982   this->plt_->reserve_slot(plt_index);
1983
1984   gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size());
1985
1986   unsigned int got_offset = (plt_index + 3) * 8;
1987   this->plt_->add_relocation(symtab, layout, gsym, got_offset);
1988 }
1989
1990 // Force a COPY relocation for a given symbol.
1991
1992 template<int size>
1993 void
1994 Target_x86_64<size>::emit_copy_reloc(
1995     Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset)
1996 {
1997   this->copy_relocs_.emit_copy_reloc(symtab,
1998                                      symtab->get_sized_symbol<size>(sym),
1999                                      os,
2000                                      offset,
2001                                      this->rela_dyn_section(NULL));
2002 }
2003
2004 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
2005
2006 template<int size>
2007 void
2008 Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab,
2009                                             Layout* layout)
2010 {
2011   if (this->tls_base_symbol_defined_)
2012     return;
2013
2014   Output_segment* tls_segment = layout->tls_segment();
2015   if (tls_segment != NULL)
2016     {
2017       bool is_exec = parameters->options().output_is_executable();
2018       symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
2019                                        Symbol_table::PREDEFINED,
2020                                        tls_segment, 0, 0,
2021                                        elfcpp::STT_TLS,
2022                                        elfcpp::STB_LOCAL,
2023                                        elfcpp::STV_HIDDEN, 0,
2024                                        (is_exec
2025                                         ? Symbol::SEGMENT_END
2026                                         : Symbol::SEGMENT_START),
2027                                        true);
2028     }
2029   this->tls_base_symbol_defined_ = true;
2030 }
2031
2032 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
2033
2034 template<int size>
2035 void
2036 Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab,
2037                                              Layout* layout)
2038 {
2039   if (this->plt_ == NULL)
2040     this->make_plt_section(symtab, layout);
2041
2042   if (!this->plt_->has_tlsdesc_entry())
2043     {
2044       // Allocate the TLSDESC_GOT entry.
2045       Output_data_got<64, false>* got = this->got_section(symtab, layout);
2046       unsigned int got_offset = got->add_constant(0);
2047
2048       // Allocate the TLSDESC_PLT entry.
2049       this->plt_->reserve_tlsdesc_entry(got_offset);
2050     }
2051 }
2052
2053 // Create a GOT entry for the TLS module index.
2054
2055 template<int size>
2056 unsigned int
2057 Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
2058                                          Sized_relobj_file<size, false>* object)
2059 {
2060   if (this->got_mod_index_offset_ == -1U)
2061     {
2062       gold_assert(symtab != NULL && layout != NULL && object != NULL);
2063       Reloc_section* rela_dyn = this->rela_dyn_section(layout);
2064       Output_data_got<64, false>* got = this->got_section(symtab, layout);
2065       unsigned int got_offset = got->add_constant(0);
2066       rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got,
2067                           got_offset, 0);
2068       got->add_constant(0);
2069       this->got_mod_index_offset_ = got_offset;
2070     }
2071   return this->got_mod_index_offset_;
2072 }
2073
2074 // Optimize the TLS relocation type based on what we know about the
2075 // symbol.  IS_FINAL is true if the final address of this symbol is
2076 // known at link time.
2077
2078 template<int size>
2079 tls::Tls_optimization
2080 Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type)
2081 {
2082   // If we are generating a shared library, then we can't do anything
2083   // in the linker.
2084   if (parameters->options().shared())
2085     return tls::TLSOPT_NONE;
2086
2087   switch (r_type)
2088     {
2089     case elfcpp::R_X86_64_TLSGD:
2090     case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2091     case elfcpp::R_X86_64_TLSDESC_CALL:
2092       // These are General-Dynamic which permits fully general TLS
2093       // access.  Since we know that we are generating an executable,
2094       // we can convert this to Initial-Exec.  If we also know that
2095       // this is a local symbol, we can further switch to Local-Exec.
2096       if (is_final)
2097         return tls::TLSOPT_TO_LE;
2098       return tls::TLSOPT_TO_IE;
2099
2100     case elfcpp::R_X86_64_TLSLD:
2101       // This is Local-Dynamic, which refers to a local symbol in the
2102       // dynamic TLS block.  Since we know that we generating an
2103       // executable, we can switch to Local-Exec.
2104       return tls::TLSOPT_TO_LE;
2105
2106     case elfcpp::R_X86_64_DTPOFF32:
2107     case elfcpp::R_X86_64_DTPOFF64:
2108       // Another Local-Dynamic reloc.
2109       return tls::TLSOPT_TO_LE;
2110
2111     case elfcpp::R_X86_64_GOTTPOFF:
2112       // These are Initial-Exec relocs which get the thread offset
2113       // from the GOT.  If we know that we are linking against the
2114       // local symbol, we can switch to Local-Exec, which links the
2115       // thread offset into the instruction.
2116       if (is_final)
2117         return tls::TLSOPT_TO_LE;
2118       return tls::TLSOPT_NONE;
2119
2120     case elfcpp::R_X86_64_TPOFF32:
2121       // When we already have Local-Exec, there is nothing further we
2122       // can do.
2123       return tls::TLSOPT_NONE;
2124
2125     default:
2126       gold_unreachable();
2127     }
2128 }
2129
2130 // Get the Reference_flags for a particular relocation.
2131
2132 template<int size>
2133 int
2134 Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type)
2135 {
2136   switch (r_type)
2137     {
2138     case elfcpp::R_X86_64_NONE:
2139     case elfcpp::R_X86_64_GNU_VTINHERIT:
2140     case elfcpp::R_X86_64_GNU_VTENTRY:
2141     case elfcpp::R_X86_64_GOTPC32:
2142     case elfcpp::R_X86_64_GOTPC64:
2143       // No symbol reference.
2144       return 0;
2145
2146     case elfcpp::R_X86_64_64:
2147     case elfcpp::R_X86_64_32:
2148     case elfcpp::R_X86_64_32S:
2149     case elfcpp::R_X86_64_16:
2150     case elfcpp::R_X86_64_8:
2151       return Symbol::ABSOLUTE_REF;
2152
2153     case elfcpp::R_X86_64_PC64:
2154     case elfcpp::R_X86_64_PC32:
2155     case elfcpp::R_X86_64_PC32_BND:
2156     case elfcpp::R_X86_64_PC16:
2157     case elfcpp::R_X86_64_PC8:
2158     case elfcpp::R_X86_64_GOTOFF64:
2159       return Symbol::RELATIVE_REF;
2160
2161     case elfcpp::R_X86_64_PLT32:
2162     case elfcpp::R_X86_64_PLT32_BND:
2163     case elfcpp::R_X86_64_PLTOFF64:
2164       return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
2165
2166     case elfcpp::R_X86_64_GOT64:
2167     case elfcpp::R_X86_64_GOT32:
2168     case elfcpp::R_X86_64_GOTPCREL64:
2169     case elfcpp::R_X86_64_GOTPCREL:
2170     case elfcpp::R_X86_64_GOTPLT64:
2171       // Absolute in GOT.
2172       return Symbol::ABSOLUTE_REF;
2173
2174     case elfcpp::R_X86_64_TLSGD:            // Global-dynamic
2175     case elfcpp::R_X86_64_GOTPC32_TLSDESC:  // Global-dynamic (from ~oliva url)
2176     case elfcpp::R_X86_64_TLSDESC_CALL:
2177     case elfcpp::R_X86_64_TLSLD:            // Local-dynamic
2178     case elfcpp::R_X86_64_DTPOFF32:
2179     case elfcpp::R_X86_64_DTPOFF64:
2180     case elfcpp::R_X86_64_GOTTPOFF:         // Initial-exec
2181     case elfcpp::R_X86_64_TPOFF32:          // Local-exec
2182       return Symbol::TLS_REF;
2183
2184     case elfcpp::R_X86_64_COPY:
2185     case elfcpp::R_X86_64_GLOB_DAT:
2186     case elfcpp::R_X86_64_JUMP_SLOT:
2187     case elfcpp::R_X86_64_RELATIVE:
2188     case elfcpp::R_X86_64_IRELATIVE:
2189     case elfcpp::R_X86_64_TPOFF64:
2190     case elfcpp::R_X86_64_DTPMOD64:
2191     case elfcpp::R_X86_64_TLSDESC:
2192     case elfcpp::R_X86_64_SIZE32:
2193     case elfcpp::R_X86_64_SIZE64:
2194     default:
2195       // Not expected.  We will give an error later.
2196       return 0;
2197     }
2198 }
2199
2200 // Report an unsupported relocation against a local symbol.
2201
2202 template<int size>
2203 void
2204 Target_x86_64<size>::Scan::unsupported_reloc_local(
2205      Sized_relobj_file<size, false>* object,
2206      unsigned int r_type)
2207 {
2208   gold_error(_("%s: unsupported reloc %u against local symbol"),
2209              object->name().c_str(), r_type);
2210 }
2211
2212 // We are about to emit a dynamic relocation of type R_TYPE.  If the
2213 // dynamic linker does not support it, issue an error.  The GNU linker
2214 // only issues a non-PIC error for an allocated read-only section.
2215 // Here we know the section is allocated, but we don't know that it is
2216 // read-only.  But we check for all the relocation types which the
2217 // glibc dynamic linker supports, so it seems appropriate to issue an
2218 // error even if the section is not read-only.  If GSYM is not NULL,
2219 // it is the symbol the relocation is against; if it is NULL, the
2220 // relocation is against a local symbol.
2221
2222 template<int size>
2223 void
2224 Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type,
2225                                          Symbol* gsym)
2226 {
2227   switch (r_type)
2228     {
2229       // These are the relocation types supported by glibc for x86_64
2230       // which should always work.
2231     case elfcpp::R_X86_64_RELATIVE:
2232     case elfcpp::R_X86_64_IRELATIVE:
2233     case elfcpp::R_X86_64_GLOB_DAT:
2234     case elfcpp::R_X86_64_JUMP_SLOT:
2235     case elfcpp::R_X86_64_DTPMOD64:
2236     case elfcpp::R_X86_64_DTPOFF64:
2237     case elfcpp::R_X86_64_TPOFF64:
2238     case elfcpp::R_X86_64_64:
2239     case elfcpp::R_X86_64_COPY:
2240       return;
2241
2242       // glibc supports these reloc types, but they can overflow.
2243     case elfcpp::R_X86_64_PC32:
2244     case elfcpp::R_X86_64_PC32_BND:
2245       // A PC relative reference is OK against a local symbol or if
2246       // the symbol is defined locally.
2247       if (gsym == NULL
2248           || (!gsym->is_from_dynobj()
2249               && !gsym->is_undefined()
2250               && !gsym->is_preemptible()))
2251         return;
2252       /* Fall through.  */
2253     case elfcpp::R_X86_64_32:
2254       // R_X86_64_32 is OK for x32.
2255       if (size == 32 && r_type == elfcpp::R_X86_64_32)
2256         return;
2257       if (this->issued_non_pic_error_)
2258         return;
2259       gold_assert(parameters->options().output_is_position_independent());
2260       if (gsym == NULL)
2261         object->error(_("requires dynamic R_X86_64_32 reloc which may "
2262                         "overflow at runtime; recompile with -fPIC"));
2263       else
2264         {
2265           const char *r_name;
2266           switch (r_type)
2267             {
2268             case elfcpp::R_X86_64_32:
2269               r_name = "R_X86_64_32";
2270               break;
2271             case elfcpp::R_X86_64_PC32:
2272               r_name = "R_X86_64_PC32";
2273               break;
2274             case elfcpp::R_X86_64_PC32_BND:
2275               r_name = "R_X86_64_PC32_BND";
2276               break;
2277             default:
2278               gold_unreachable();
2279               break;
2280             }
2281           object->error(_("requires dynamic %s reloc against '%s' "
2282                           "which may overflow at runtime; recompile "
2283                           "with -fPIC"),
2284                         r_name, gsym->name());
2285         }
2286       this->issued_non_pic_error_ = true;
2287       return;
2288
2289     default:
2290       // This prevents us from issuing more than one error per reloc
2291       // section.  But we can still wind up issuing more than one
2292       // error per object file.
2293       if (this->issued_non_pic_error_)
2294         return;
2295       gold_assert(parameters->options().output_is_position_independent());
2296       object->error(_("requires unsupported dynamic reloc %u; "
2297                       "recompile with -fPIC"),
2298                     r_type);
2299       this->issued_non_pic_error_ = true;
2300       return;
2301
2302     case elfcpp::R_X86_64_NONE:
2303       gold_unreachable();
2304     }
2305 }
2306
2307 // Return whether we need to make a PLT entry for a relocation of the
2308 // given type against a STT_GNU_IFUNC symbol.
2309
2310 template<int size>
2311 bool
2312 Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc(
2313      Sized_relobj_file<size, false>* object,
2314      unsigned int r_type)
2315 {
2316   int flags = Scan::get_reference_flags(r_type);
2317   if (flags & Symbol::TLS_REF)
2318     gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
2319                object->name().c_str(), r_type);
2320   return flags != 0;
2321 }
2322
2323 // Scan a relocation for a local symbol.
2324
2325 template<int size>
2326 inline void
2327 Target_x86_64<size>::Scan::local(Symbol_table* symtab,
2328                                  Layout* layout,
2329                                  Target_x86_64<size>* target,
2330                                  Sized_relobj_file<size, false>* object,
2331                                  unsigned int data_shndx,
2332                                  Output_section* output_section,
2333                                  const elfcpp::Rela<size, false>& reloc,
2334                                  unsigned int r_type,
2335                                  const elfcpp::Sym<size, false>& lsym,
2336                                  bool is_discarded)
2337 {
2338   if (is_discarded)
2339     return;
2340
2341   // A local STT_GNU_IFUNC symbol may require a PLT entry.
2342   bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
2343   if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
2344     {
2345       unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2346       target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
2347     }
2348
2349   switch (r_type)
2350     {
2351     case elfcpp::R_X86_64_NONE:
2352     case elfcpp::R_X86_64_GNU_VTINHERIT:
2353     case elfcpp::R_X86_64_GNU_VTENTRY:
2354       break;
2355
2356     case elfcpp::R_X86_64_64:
2357       // If building a shared library (or a position-independent
2358       // executable), we need to create a dynamic relocation for this
2359       // location.  The relocation applied at link time will apply the
2360       // link-time value, so we flag the location with an
2361       // R_X86_64_RELATIVE relocation so the dynamic loader can
2362       // relocate it easily.
2363       if (parameters->options().output_is_position_independent())
2364         {
2365           unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2366           Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2367           rela_dyn->add_local_relative(object, r_sym,
2368                                        (size == 32
2369                                         ? elfcpp::R_X86_64_RELATIVE64
2370                                         : elfcpp::R_X86_64_RELATIVE),
2371                                        output_section, data_shndx,
2372                                        reloc.get_r_offset(),
2373                                        reloc.get_r_addend(), is_ifunc);
2374         }
2375       break;
2376
2377     case elfcpp::R_X86_64_32:
2378     case elfcpp::R_X86_64_32S:
2379     case elfcpp::R_X86_64_16:
2380     case elfcpp::R_X86_64_8:
2381       // If building a shared library (or a position-independent
2382       // executable), we need to create a dynamic relocation for this
2383       // location.  We can't use an R_X86_64_RELATIVE relocation
2384       // because that is always a 64-bit relocation.
2385       if (parameters->options().output_is_position_independent())
2386         {
2387           // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32.
2388           if (size == 32 && r_type == elfcpp::R_X86_64_32)
2389             {
2390               unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2391               Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2392               rela_dyn->add_local_relative(object, r_sym,
2393                                            elfcpp::R_X86_64_RELATIVE,
2394                                            output_section, data_shndx,
2395                                            reloc.get_r_offset(),
2396                                            reloc.get_r_addend(), is_ifunc);
2397               break;
2398             }
2399
2400           this->check_non_pic(object, r_type, NULL);
2401
2402           Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2403           unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2404           if (lsym.get_st_type() != elfcpp::STT_SECTION)
2405             rela_dyn->add_local(object, r_sym, r_type, output_section,
2406                                 data_shndx, reloc.get_r_offset(),
2407                                 reloc.get_r_addend());
2408           else
2409             {
2410               gold_assert(lsym.get_st_value() == 0);
2411               unsigned int shndx = lsym.get_st_shndx();
2412               bool is_ordinary;
2413               shndx = object->adjust_sym_shndx(r_sym, shndx,
2414                                                &is_ordinary);
2415               if (!is_ordinary)
2416                 object->error(_("section symbol %u has bad shndx %u"),
2417                               r_sym, shndx);
2418               else
2419                 rela_dyn->add_local_section(object, shndx,
2420                                             r_type, output_section,
2421                                             data_shndx, reloc.get_r_offset(),
2422                                             reloc.get_r_addend());
2423             }
2424         }
2425       break;
2426
2427     case elfcpp::R_X86_64_PC64:
2428     case elfcpp::R_X86_64_PC32:
2429     case elfcpp::R_X86_64_PC32_BND:
2430     case elfcpp::R_X86_64_PC16:
2431     case elfcpp::R_X86_64_PC8:
2432       break;
2433
2434     case elfcpp::R_X86_64_PLT32:
2435     case elfcpp::R_X86_64_PLT32_BND:
2436       // Since we know this is a local symbol, we can handle this as a
2437       // PC32 reloc.
2438       break;
2439
2440     case elfcpp::R_X86_64_GOTPC32:
2441     case elfcpp::R_X86_64_GOTOFF64:
2442     case elfcpp::R_X86_64_GOTPC64:
2443     case elfcpp::R_X86_64_PLTOFF64:
2444       // We need a GOT section.
2445       target->got_section(symtab, layout);
2446       // For PLTOFF64, we'd normally want a PLT section, but since we
2447       // know this is a local symbol, no PLT is needed.
2448       break;
2449
2450     case elfcpp::R_X86_64_GOT64:
2451     case elfcpp::R_X86_64_GOT32:
2452     case elfcpp::R_X86_64_GOTPCREL64:
2453     case elfcpp::R_X86_64_GOTPCREL:
2454     case elfcpp::R_X86_64_GOTPLT64:
2455       {
2456         // The symbol requires a GOT entry.
2457         Output_data_got<64, false>* got = target->got_section(symtab, layout);
2458         unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2459
2460         // For a STT_GNU_IFUNC symbol we want the PLT offset.  That
2461         // lets function pointers compare correctly with shared
2462         // libraries.  Otherwise we would need an IRELATIVE reloc.
2463         bool is_new;
2464         if (is_ifunc)
2465           is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
2466         else
2467           is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
2468         if (is_new)
2469           {
2470             // If we are generating a shared object, we need to add a
2471             // dynamic relocation for this symbol's GOT entry.
2472             if (parameters->options().output_is_position_independent())
2473               {
2474                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2475                 // R_X86_64_RELATIVE assumes a 64-bit relocation.
2476                 if (r_type != elfcpp::R_X86_64_GOT32)
2477                   {
2478                     unsigned int got_offset =
2479                       object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
2480                     rela_dyn->add_local_relative(object, r_sym,
2481                                                  elfcpp::R_X86_64_RELATIVE,
2482                                                  got, got_offset, 0, is_ifunc);
2483                   }
2484                 else
2485                   {
2486                     this->check_non_pic(object, r_type, NULL);
2487
2488                     gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
2489                     rela_dyn->add_local(
2490                         object, r_sym, r_type, got,
2491                         object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
2492                   }
2493               }
2494           }
2495         // For GOTPLT64, we'd normally want a PLT section, but since
2496         // we know this is a local symbol, no PLT is needed.
2497       }
2498       break;
2499
2500     case elfcpp::R_X86_64_COPY:
2501     case elfcpp::R_X86_64_GLOB_DAT:
2502     case elfcpp::R_X86_64_JUMP_SLOT:
2503     case elfcpp::R_X86_64_RELATIVE:
2504     case elfcpp::R_X86_64_IRELATIVE:
2505       // These are outstanding tls relocs, which are unexpected when linking
2506     case elfcpp::R_X86_64_TPOFF64:
2507     case elfcpp::R_X86_64_DTPMOD64:
2508     case elfcpp::R_X86_64_TLSDESC:
2509       gold_error(_("%s: unexpected reloc %u in object file"),
2510                  object->name().c_str(), r_type);
2511       break;
2512
2513       // These are initial tls relocs, which are expected when linking
2514     case elfcpp::R_X86_64_TLSGD:            // Global-dynamic
2515     case elfcpp::R_X86_64_GOTPC32_TLSDESC:  // Global-dynamic (from ~oliva url)
2516     case elfcpp::R_X86_64_TLSDESC_CALL:
2517     case elfcpp::R_X86_64_TLSLD:            // Local-dynamic
2518     case elfcpp::R_X86_64_DTPOFF32:
2519     case elfcpp::R_X86_64_DTPOFF64:
2520     case elfcpp::R_X86_64_GOTTPOFF:         // Initial-exec
2521     case elfcpp::R_X86_64_TPOFF32:          // Local-exec
2522       {
2523         bool output_is_shared = parameters->options().shared();
2524         const tls::Tls_optimization optimized_type
2525             = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared,
2526                                                       r_type);
2527         switch (r_type)
2528           {
2529           case elfcpp::R_X86_64_TLSGD:       // General-dynamic
2530             if (optimized_type == tls::TLSOPT_NONE)
2531               {
2532                 // Create a pair of GOT entries for the module index and
2533                 // dtv-relative offset.
2534                 Output_data_got<64, false>* got
2535                     = target->got_section(symtab, layout);
2536                 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2537                 unsigned int shndx = lsym.get_st_shndx();
2538                 bool is_ordinary;
2539                 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
2540                 if (!is_ordinary)
2541                   object->error(_("local symbol %u has bad shndx %u"),
2542                               r_sym, shndx);
2543                 else
2544                   got->add_local_pair_with_rel(object, r_sym,
2545                                                shndx,
2546                                                GOT_TYPE_TLS_PAIR,
2547                                                target->rela_dyn_section(layout),
2548                                                elfcpp::R_X86_64_DTPMOD64);
2549               }
2550             else if (optimized_type != tls::TLSOPT_TO_LE)
2551               unsupported_reloc_local(object, r_type);
2552             break;
2553
2554           case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2555             target->define_tls_base_symbol(symtab, layout);
2556             if (optimized_type == tls::TLSOPT_NONE)
2557               {
2558                 // Create reserved PLT and GOT entries for the resolver.
2559                 target->reserve_tlsdesc_entries(symtab, layout);
2560
2561                 // Generate a double GOT entry with an
2562                 // R_X86_64_TLSDESC reloc.  The R_X86_64_TLSDESC reloc
2563                 // is resolved lazily, so the GOT entry needs to be in
2564                 // an area in .got.plt, not .got.  Call got_section to
2565                 // make sure the section has been created.
2566                 target->got_section(symtab, layout);
2567                 Output_data_got<64, false>* got = target->got_tlsdesc_section();
2568                 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2569                 if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
2570                   {
2571                     unsigned int got_offset = got->add_constant(0);
2572                     got->add_constant(0);
2573                     object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
2574                                                  got_offset);
2575                     Reloc_section* rt = target->rela_tlsdesc_section(layout);
2576                     // We store the arguments we need in a vector, and
2577                     // use the index into the vector as the parameter
2578                     // to pass to the target specific routines.
2579                     uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
2580                     void* arg = reinterpret_cast<void*>(intarg);
2581                     rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
2582                                             got, got_offset, 0);
2583                   }
2584               }
2585             else if (optimized_type != tls::TLSOPT_TO_LE)
2586               unsupported_reloc_local(object, r_type);
2587             break;
2588
2589           case elfcpp::R_X86_64_TLSDESC_CALL:
2590             break;
2591
2592           case elfcpp::R_X86_64_TLSLD:       // Local-dynamic
2593             if (optimized_type == tls::TLSOPT_NONE)
2594               {
2595                 // Create a GOT entry for the module index.
2596                 target->got_mod_index_entry(symtab, layout, object);
2597               }
2598             else if (optimized_type != tls::TLSOPT_TO_LE)
2599               unsupported_reloc_local(object, r_type);
2600             break;
2601
2602           case elfcpp::R_X86_64_DTPOFF32:
2603           case elfcpp::R_X86_64_DTPOFF64:
2604             break;
2605
2606           case elfcpp::R_X86_64_GOTTPOFF:    // Initial-exec
2607             layout->set_has_static_tls();
2608             if (optimized_type == tls::TLSOPT_NONE)
2609               {
2610                 // Create a GOT entry for the tp-relative offset.
2611                 Output_data_got<64, false>* got
2612                     = target->got_section(symtab, layout);
2613                 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2614                 got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
2615                                         target->rela_dyn_section(layout),
2616                                         elfcpp::R_X86_64_TPOFF64);
2617               }
2618             else if (optimized_type != tls::TLSOPT_TO_LE)
2619               unsupported_reloc_local(object, r_type);
2620             break;
2621
2622           case elfcpp::R_X86_64_TPOFF32:     // Local-exec
2623             layout->set_has_static_tls();
2624             if (output_is_shared)
2625               unsupported_reloc_local(object, r_type);
2626             break;
2627
2628           default:
2629             gold_unreachable();
2630           }
2631       }
2632       break;
2633
2634     case elfcpp::R_X86_64_SIZE32:
2635     case elfcpp::R_X86_64_SIZE64:
2636     default:
2637       gold_error(_("%s: unsupported reloc %u against local symbol"),
2638                  object->name().c_str(), r_type);
2639       break;
2640     }
2641 }
2642
2643
2644 // Report an unsupported relocation against a global symbol.
2645
2646 template<int size>
2647 void
2648 Target_x86_64<size>::Scan::unsupported_reloc_global(
2649     Sized_relobj_file<size, false>* object,
2650     unsigned int r_type,
2651     Symbol* gsym)
2652 {
2653   gold_error(_("%s: unsupported reloc %u against global symbol %s"),
2654              object->name().c_str(), r_type, gsym->demangled_name().c_str());
2655 }
2656
2657 // Returns true if this relocation type could be that of a function pointer.
2658 template<int size>
2659 inline bool
2660 Target_x86_64<size>::Scan::possible_function_pointer_reloc(unsigned int r_type)
2661 {
2662   switch (r_type)
2663     {
2664     case elfcpp::R_X86_64_64:
2665     case elfcpp::R_X86_64_32:
2666     case elfcpp::R_X86_64_32S:
2667     case elfcpp::R_X86_64_16:
2668     case elfcpp::R_X86_64_8:
2669     case elfcpp::R_X86_64_GOT64:
2670     case elfcpp::R_X86_64_GOT32:
2671     case elfcpp::R_X86_64_GOTPCREL64:
2672     case elfcpp::R_X86_64_GOTPCREL:
2673     case elfcpp::R_X86_64_GOTPLT64:
2674       {
2675         return true;
2676       }
2677     }
2678   return false;
2679 }
2680
2681 // For safe ICF, scan a relocation for a local symbol to check if it
2682 // corresponds to a function pointer being taken.  In that case mark
2683 // the function whose pointer was taken as not foldable.
2684
2685 template<int size>
2686 inline bool
2687 Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer(
2688   Symbol_table* ,
2689   Layout* ,
2690   Target_x86_64<size>* ,
2691   Sized_relobj_file<size, false>* ,
2692   unsigned int ,
2693   Output_section* ,
2694   const elfcpp::Rela<size, false>& ,
2695   unsigned int r_type,
2696   const elfcpp::Sym<size, false>&)
2697 {
2698   // When building a shared library, do not fold any local symbols as it is
2699   // not possible to distinguish pointer taken versus a call by looking at
2700   // the relocation types.
2701   return (parameters->options().shared()
2702           || possible_function_pointer_reloc(r_type));
2703 }
2704
2705 // For safe ICF, scan a relocation for a global symbol to check if it
2706 // corresponds to a function pointer being taken.  In that case mark
2707 // the function whose pointer was taken as not foldable.
2708
2709 template<int size>
2710 inline bool
2711 Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer(
2712   Symbol_table*,
2713   Layout* ,
2714   Target_x86_64<size>* ,
2715   Sized_relobj_file<size, false>* ,
2716   unsigned int ,
2717   Output_section* ,
2718   const elfcpp::Rela<size, false>& ,
2719   unsigned int r_type,
2720   Symbol* gsym)
2721 {
2722   // When building a shared library, do not fold symbols whose visibility
2723   // is hidden, internal or protected.
2724   return ((parameters->options().shared()
2725            && (gsym->visibility() == elfcpp::STV_INTERNAL
2726                || gsym->visibility() == elfcpp::STV_PROTECTED
2727                || gsym->visibility() == elfcpp::STV_HIDDEN))
2728           || possible_function_pointer_reloc(r_type));
2729 }
2730
2731 // Scan a relocation for a global symbol.
2732
2733 template<int size>
2734 inline void
2735 Target_x86_64<size>::Scan::global(Symbol_table* symtab,
2736                             Layout* layout,
2737                             Target_x86_64<size>* target,
2738                             Sized_relobj_file<size, false>* object,
2739                             unsigned int data_shndx,
2740                             Output_section* output_section,
2741                             const elfcpp::Rela<size, false>& reloc,
2742                             unsigned int r_type,
2743                             Symbol* gsym)
2744 {
2745   // A STT_GNU_IFUNC symbol may require a PLT entry.
2746   if (gsym->type() == elfcpp::STT_GNU_IFUNC
2747       && this->reloc_needs_plt_for_ifunc(object, r_type))
2748     target->make_plt_entry(symtab, layout, gsym);
2749
2750   switch (r_type)
2751     {
2752     case elfcpp::R_X86_64_NONE:
2753     case elfcpp::R_X86_64_GNU_VTINHERIT:
2754     case elfcpp::R_X86_64_GNU_VTENTRY:
2755       break;
2756
2757     case elfcpp::R_X86_64_64:
2758     case elfcpp::R_X86_64_32:
2759     case elfcpp::R_X86_64_32S:
2760     case elfcpp::R_X86_64_16:
2761     case elfcpp::R_X86_64_8:
2762       {
2763         // Make a PLT entry if necessary.
2764         if (gsym->needs_plt_entry())
2765           {
2766             target->make_plt_entry(symtab, layout, gsym);
2767             // Since this is not a PC-relative relocation, we may be
2768             // taking the address of a function. In that case we need to
2769             // set the entry in the dynamic symbol table to the address of
2770             // the PLT entry.
2771             if (gsym->is_from_dynobj() && !parameters->options().shared())
2772               gsym->set_needs_dynsym_value();
2773           }
2774         // Make a dynamic relocation if necessary.
2775         if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
2776           {
2777             if (!parameters->options().output_is_position_independent()
2778                 && gsym->may_need_copy_reloc())
2779               {
2780                 target->copy_reloc(symtab, layout, object,
2781                                    data_shndx, output_section, gsym, reloc);
2782               }
2783             else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
2784                       || (size == 32 && r_type == elfcpp::R_X86_64_32))
2785                      && gsym->type() == elfcpp::STT_GNU_IFUNC
2786                      && gsym->can_use_relative_reloc(false)
2787                      && !gsym->is_from_dynobj()
2788                      && !gsym->is_undefined()
2789                      && !gsym->is_preemptible())
2790               {
2791                 // Use an IRELATIVE reloc for a locally defined
2792                 // STT_GNU_IFUNC symbol.  This makes a function
2793                 // address in a PIE executable match the address in a
2794                 // shared library that it links against.
2795                 Reloc_section* rela_dyn =
2796                   target->rela_irelative_section(layout);
2797                 unsigned int r_type = elfcpp::R_X86_64_IRELATIVE;
2798                 rela_dyn->add_symbolless_global_addend(gsym, r_type,
2799                                                        output_section, object,
2800                                                        data_shndx,
2801                                                        reloc.get_r_offset(),
2802                                                        reloc.get_r_addend());
2803               }
2804             else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
2805                       || (size == 32 && r_type == elfcpp::R_X86_64_32))
2806                      && gsym->can_use_relative_reloc(false))
2807               {
2808                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2809                 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
2810                                               output_section, object,
2811                                               data_shndx,
2812                                               reloc.get_r_offset(),
2813                                               reloc.get_r_addend(), false);
2814               }
2815             else
2816               {
2817                 this->check_non_pic(object, r_type, gsym);
2818                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2819                 rela_dyn->add_global(gsym, r_type, output_section, object,
2820                                      data_shndx, reloc.get_r_offset(),
2821                                      reloc.get_r_addend());
2822               }
2823           }
2824       }
2825       break;
2826
2827     case elfcpp::R_X86_64_PC64:
2828     case elfcpp::R_X86_64_PC32:
2829     case elfcpp::R_X86_64_PC32_BND:
2830     case elfcpp::R_X86_64_PC16:
2831     case elfcpp::R_X86_64_PC8:
2832       {
2833         // Make a PLT entry if necessary.
2834         if (gsym->needs_plt_entry())
2835           target->make_plt_entry(symtab, layout, gsym);
2836         // Make a dynamic relocation if necessary.
2837         if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
2838           {
2839             if (parameters->options().output_is_executable()
2840                 && gsym->may_need_copy_reloc())
2841               {
2842                 target->copy_reloc(symtab, layout, object,
2843                                    data_shndx, output_section, gsym, reloc);
2844               }
2845             else
2846               {
2847                 this->check_non_pic(object, r_type, gsym);
2848                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2849                 rela_dyn->add_global(gsym, r_type, output_section, object,
2850                                      data_shndx, reloc.get_r_offset(),
2851                                      reloc.get_r_addend());
2852               }
2853           }
2854       }
2855       break;
2856
2857     case elfcpp::R_X86_64_GOT64:
2858     case elfcpp::R_X86_64_GOT32:
2859     case elfcpp::R_X86_64_GOTPCREL64:
2860     case elfcpp::R_X86_64_GOTPCREL:
2861     case elfcpp::R_X86_64_GOTPLT64:
2862       {
2863         // The symbol requires a GOT entry.
2864         Output_data_got<64, false>* got = target->got_section(symtab, layout);
2865         if (gsym->final_value_is_known())
2866           {
2867             // For a STT_GNU_IFUNC symbol we want the PLT address.
2868             if (gsym->type() == elfcpp::STT_GNU_IFUNC)
2869               got->add_global_plt(gsym, GOT_TYPE_STANDARD);
2870             else
2871               got->add_global(gsym, GOT_TYPE_STANDARD);
2872           }
2873         else
2874           {
2875             // If this symbol is not fully resolved, we need to add a
2876             // dynamic relocation for it.
2877             Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2878
2879             // Use a GLOB_DAT rather than a RELATIVE reloc if:
2880             //
2881             // 1) The symbol may be defined in some other module.
2882             //
2883             // 2) We are building a shared library and this is a
2884             // protected symbol; using GLOB_DAT means that the dynamic
2885             // linker can use the address of the PLT in the main
2886             // executable when appropriate so that function address
2887             // comparisons work.
2888             //
2889             // 3) This is a STT_GNU_IFUNC symbol in position dependent
2890             // code, again so that function address comparisons work.
2891             if (gsym->is_from_dynobj()
2892                 || gsym->is_undefined()
2893                 || gsym->is_preemptible()
2894                 || (gsym->visibility() == elfcpp::STV_PROTECTED
2895                     && parameters->options().shared())
2896                 || (gsym->type() == elfcpp::STT_GNU_IFUNC
2897                     && parameters->options().output_is_position_independent()))
2898               got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
2899                                        elfcpp::R_X86_64_GLOB_DAT);
2900             else
2901               {
2902                 // For a STT_GNU_IFUNC symbol we want to write the PLT
2903                 // offset into the GOT, so that function pointer
2904                 // comparisons work correctly.
2905                 bool is_new;
2906                 if (gsym->type() != elfcpp::STT_GNU_IFUNC)
2907                   is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
2908                 else
2909                   {
2910                     is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
2911                     // Tell the dynamic linker to use the PLT address
2912                     // when resolving relocations.
2913                     if (gsym->is_from_dynobj()
2914                         && !parameters->options().shared())
2915                       gsym->set_needs_dynsym_value();
2916                   }
2917                 if (is_new)
2918                   {
2919                     unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD);
2920                     rela_dyn->add_global_relative(gsym,
2921                                                   elfcpp::R_X86_64_RELATIVE,
2922                                                   got, got_off, 0, false);
2923                   }
2924               }
2925           }
2926         // For GOTPLT64, we also need a PLT entry (but only if the
2927         // symbol is not fully resolved).
2928         if (r_type == elfcpp::R_X86_64_GOTPLT64
2929             && !gsym->final_value_is_known())
2930           target->make_plt_entry(symtab, layout, gsym);
2931       }
2932       break;
2933
2934     case elfcpp::R_X86_64_PLT32:
2935     case elfcpp::R_X86_64_PLT32_BND:
2936       // If the symbol is fully resolved, this is just a PC32 reloc.
2937       // Otherwise we need a PLT entry.
2938       if (gsym->final_value_is_known())
2939         break;
2940       // If building a shared library, we can also skip the PLT entry
2941       // if the symbol is defined in the output file and is protected
2942       // or hidden.
2943       if (gsym->is_defined()
2944           && !gsym->is_from_dynobj()
2945           && !gsym->is_preemptible())
2946         break;
2947       target->make_plt_entry(symtab, layout, gsym);
2948       break;
2949
2950     case elfcpp::R_X86_64_GOTPC32:
2951     case elfcpp::R_X86_64_GOTOFF64:
2952     case elfcpp::R_X86_64_GOTPC64:
2953     case elfcpp::R_X86_64_PLTOFF64:
2954       // We need a GOT section.
2955       target->got_section(symtab, layout);
2956       // For PLTOFF64, we also need a PLT entry (but only if the
2957       // symbol is not fully resolved).
2958       if (r_type == elfcpp::R_X86_64_PLTOFF64
2959           && !gsym->final_value_is_known())
2960         target->make_plt_entry(symtab, layout, gsym);
2961       break;
2962
2963     case elfcpp::R_X86_64_COPY:
2964     case elfcpp::R_X86_64_GLOB_DAT:
2965     case elfcpp::R_X86_64_JUMP_SLOT:
2966     case elfcpp::R_X86_64_RELATIVE:
2967     case elfcpp::R_X86_64_IRELATIVE:
2968       // These are outstanding tls relocs, which are unexpected when linking
2969     case elfcpp::R_X86_64_TPOFF64:
2970     case elfcpp::R_X86_64_DTPMOD64:
2971     case elfcpp::R_X86_64_TLSDESC:
2972       gold_error(_("%s: unexpected reloc %u in object file"),
2973                  object->name().c_str(), r_type);
2974       break;
2975
2976       // These are initial tls relocs, which are expected for global()
2977     case elfcpp::R_X86_64_TLSGD:            // Global-dynamic
2978     case elfcpp::R_X86_64_GOTPC32_TLSDESC:  // Global-dynamic (from ~oliva url)
2979     case elfcpp::R_X86_64_TLSDESC_CALL:
2980     case elfcpp::R_X86_64_TLSLD:            // Local-dynamic
2981     case elfcpp::R_X86_64_DTPOFF32:
2982     case elfcpp::R_X86_64_DTPOFF64:
2983     case elfcpp::R_X86_64_GOTTPOFF:         // Initial-exec
2984     case elfcpp::R_X86_64_TPOFF32:          // Local-exec
2985       {
2986         const bool is_final = gsym->final_value_is_known();
2987         const tls::Tls_optimization optimized_type
2988             = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
2989         switch (r_type)
2990           {
2991           case elfcpp::R_X86_64_TLSGD:       // General-dynamic
2992             if (optimized_type == tls::TLSOPT_NONE)
2993               {
2994                 // Create a pair of GOT entries for the module index and
2995                 // dtv-relative offset.
2996                 Output_data_got<64, false>* got
2997                     = target->got_section(symtab, layout);
2998                 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
2999                                               target->rela_dyn_section(layout),
3000                                               elfcpp::R_X86_64_DTPMOD64,
3001                                               elfcpp::R_X86_64_DTPOFF64);
3002               }
3003             else if (optimized_type == tls::TLSOPT_TO_IE)
3004               {
3005                 // Create a GOT entry for the tp-relative offset.
3006                 Output_data_got<64, false>* got
3007                     = target->got_section(symtab, layout);
3008                 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
3009                                          target->rela_dyn_section(layout),
3010                                          elfcpp::R_X86_64_TPOFF64);
3011               }
3012             else if (optimized_type != tls::TLSOPT_TO_LE)
3013               unsupported_reloc_global(object, r_type, gsym);
3014             break;
3015
3016           case elfcpp::R_X86_64_GOTPC32_TLSDESC:
3017             target->define_tls_base_symbol(symtab, layout);
3018             if (optimized_type == tls::TLSOPT_NONE)
3019               {
3020                 // Create reserved PLT and GOT entries for the resolver.
3021                 target->reserve_tlsdesc_entries(symtab, layout);
3022
3023                 // Create a double GOT entry with an R_X86_64_TLSDESC
3024                 // reloc.  The R_X86_64_TLSDESC reloc is resolved
3025                 // lazily, so the GOT entry needs to be in an area in
3026                 // .got.plt, not .got.  Call got_section to make sure
3027                 // the section has been created.
3028                 target->got_section(symtab, layout);
3029                 Output_data_got<64, false>* got = target->got_tlsdesc_section();
3030                 Reloc_section* rt = target->rela_tlsdesc_section(layout);
3031                 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
3032                                               elfcpp::R_X86_64_TLSDESC, 0);
3033               }
3034             else if (optimized_type == tls::TLSOPT_TO_IE)
3035               {
3036                 // Create a GOT entry for the tp-relative offset.
3037                 Output_data_got<64, false>* got
3038                     = target->got_section(symtab, layout);
3039                 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
3040                                          target->rela_dyn_section(layout),
3041                                          elfcpp::R_X86_64_TPOFF64);
3042               }
3043             else if (optimized_type != tls::TLSOPT_TO_LE)
3044               unsupported_reloc_global(object, r_type, gsym);
3045             break;
3046
3047           case elfcpp::R_X86_64_TLSDESC_CALL:
3048             break;
3049
3050           case elfcpp::R_X86_64_TLSLD:       // Local-dynamic
3051             if (optimized_type == tls::TLSOPT_NONE)
3052               {
3053                 // Create a GOT entry for the module index.
3054                 target->got_mod_index_entry(symtab, layout, object);
3055               }
3056             else if (optimized_type != tls::TLSOPT_TO_LE)
3057               unsupported_reloc_global(object, r_type, gsym);
3058             break;
3059
3060           case elfcpp::R_X86_64_DTPOFF32:
3061           case elfcpp::R_X86_64_DTPOFF64:
3062             break;
3063
3064           case elfcpp::R_X86_64_GOTTPOFF:    // Initial-exec
3065             layout->set_has_static_tls();
3066             if (optimized_type == tls::TLSOPT_NONE)
3067               {
3068                 // Create a GOT entry for the tp-relative offset.
3069                 Output_data_got<64, false>* got
3070                     = target->got_section(symtab, layout);
3071                 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
3072                                          target->rela_dyn_section(layout),
3073                                          elfcpp::R_X86_64_TPOFF64);
3074               }
3075             else if (optimized_type != tls::TLSOPT_TO_LE)
3076               unsupported_reloc_global(object, r_type, gsym);
3077             break;
3078
3079           case elfcpp::R_X86_64_TPOFF32:     // Local-exec
3080             layout->set_has_static_tls();
3081             if (parameters->options().shared())
3082               unsupported_reloc_global(object, r_type, gsym);
3083             break;
3084
3085           default:
3086             gold_unreachable();
3087           }
3088       }
3089       break;
3090
3091     case elfcpp::R_X86_64_SIZE32:
3092     case elfcpp::R_X86_64_SIZE64:
3093     default:
3094       gold_error(_("%s: unsupported reloc %u against global symbol %s"),
3095                  object->name().c_str(), r_type,
3096                  gsym->demangled_name().c_str());
3097       break;
3098     }
3099 }
3100
3101 template<int size>
3102 void
3103 Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab,
3104                                        Layout* layout,
3105                                        Sized_relobj_file<size, false>* object,
3106                                        unsigned int data_shndx,
3107                                        unsigned int sh_type,
3108                                        const unsigned char* prelocs,
3109                                        size_t reloc_count,
3110                                        Output_section* output_section,
3111                                        bool needs_special_offset_handling,
3112                                        size_t local_symbol_count,
3113                                        const unsigned char* plocal_symbols)
3114 {
3115
3116   if (sh_type == elfcpp::SHT_REL)
3117     {
3118       return;
3119     }
3120
3121    gold::gc_process_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
3122                            typename Target_x86_64<size>::Scan,
3123                            typename Target_x86_64<size>::Relocatable_size_for_reloc>(
3124     symtab,
3125     layout,
3126     this,
3127     object,
3128     data_shndx,
3129     prelocs,
3130     reloc_count,
3131     output_section,
3132     needs_special_offset_handling,
3133     local_symbol_count,
3134     plocal_symbols);
3135
3136 }
3137 // Scan relocations for a section.
3138
3139 template<int size>
3140 void
3141 Target_x86_64<size>::scan_relocs(Symbol_table* symtab,
3142                                  Layout* layout,
3143                                  Sized_relobj_file<size, false>* object,
3144                                  unsigned int data_shndx,
3145                                  unsigned int sh_type,
3146                                  const unsigned char* prelocs,
3147                                  size_t reloc_count,
3148                                  Output_section* output_section,
3149                                  bool needs_special_offset_handling,
3150                                  size_t local_symbol_count,
3151                                  const unsigned char* plocal_symbols)
3152 {
3153   if (sh_type == elfcpp::SHT_REL)
3154     {
3155       gold_error(_("%s: unsupported REL reloc section"),
3156                  object->name().c_str());
3157       return;
3158     }
3159
3160   gold::scan_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
3161       typename Target_x86_64<size>::Scan>(
3162     symtab,
3163     layout,
3164     this,
3165     object,
3166     data_shndx,
3167     prelocs,
3168     reloc_count,
3169     output_section,
3170     needs_special_offset_handling,
3171     local_symbol_count,
3172     plocal_symbols);
3173 }
3174
3175 // Finalize the sections.
3176
3177 template<int size>
3178 void
3179 Target_x86_64<size>::do_finalize_sections(
3180     Layout* layout,
3181     const Input_objects*,
3182     Symbol_table* symtab)
3183 {
3184   const Reloc_section* rel_plt = (this->plt_ == NULL
3185                                   ? NULL
3186                                   : this->plt_->rela_plt());
3187   layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
3188                                   this->rela_dyn_, true, false);
3189
3190   // Fill in some more dynamic tags.
3191   Output_data_dynamic* const odyn = layout->dynamic_data();
3192   if (odyn != NULL)
3193     {
3194       if (this->plt_ != NULL
3195           && this->plt_->output_section() != NULL
3196           && this->plt_->has_tlsdesc_entry())
3197         {
3198           unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
3199           unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
3200           this->got_->finalize_data_size();
3201           odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
3202                                         this->plt_, plt_offset);
3203           odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
3204                                         this->got_, got_offset);
3205         }
3206     }
3207
3208   // Emit any relocs we saved in an attempt to avoid generating COPY
3209   // relocs.
3210   if (this->copy_relocs_.any_saved_relocs())
3211     this->copy_relocs_.emit(this->rela_dyn_section(layout));
3212
3213   // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
3214   // the .got.plt section.
3215   Symbol* sym = this->global_offset_table_;
3216   if (sym != NULL)
3217     {
3218       uint64_t data_size = this->got_plt_->current_data_size();
3219       symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
3220     }
3221
3222   if (parameters->doing_static_link()
3223       && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
3224     {
3225       // If linking statically, make sure that the __rela_iplt symbols
3226       // were defined if necessary, even if we didn't create a PLT.
3227       static const Define_symbol_in_segment syms[] =
3228         {
3229           {
3230             "__rela_iplt_start",        // name
3231             elfcpp::PT_LOAD,            // segment_type
3232             elfcpp::PF_W,               // segment_flags_set
3233             elfcpp::PF(0),              // segment_flags_clear
3234             0,                          // value
3235             0,                          // size
3236             elfcpp::STT_NOTYPE,         // type
3237             elfcpp::STB_GLOBAL,         // binding
3238             elfcpp::STV_HIDDEN,         // visibility
3239             0,                          // nonvis
3240             Symbol::SEGMENT_START,      // offset_from_base
3241             true                        // only_if_ref
3242           },
3243           {
3244             "__rela_iplt_end",          // name
3245             elfcpp::PT_LOAD,            // segment_type
3246             elfcpp::PF_W,               // segment_flags_set
3247             elfcpp::PF(0),              // segment_flags_clear
3248             0,                          // value
3249             0,                          // size
3250             elfcpp::STT_NOTYPE,         // type
3251             elfcpp::STB_GLOBAL,         // binding
3252             elfcpp::STV_HIDDEN,         // visibility
3253             0,                          // nonvis
3254             Symbol::SEGMENT_START,      // offset_from_base
3255             true                        // only_if_ref
3256           }
3257         };
3258
3259       symtab->define_symbols(layout, 2, syms,
3260                              layout->script_options()->saw_sections_clause());
3261     }
3262 }
3263
3264 // Perform a relocation.
3265
3266 template<int size>
3267 inline bool
3268 Target_x86_64<size>::Relocate::relocate(
3269     const Relocate_info<size, false>* relinfo,
3270     Target_x86_64<size>* target,
3271     Output_section*,
3272     size_t relnum,
3273     const elfcpp::Rela<size, false>& rela,
3274     unsigned int r_type,
3275     const Sized_symbol<size>* gsym,
3276     const Symbol_value<size>* psymval,
3277     unsigned char* view,
3278     typename elfcpp::Elf_types<size>::Elf_Addr address,
3279     section_size_type view_size)
3280 {
3281   if (this->skip_call_tls_get_addr_)
3282     {
3283       if ((r_type != elfcpp::R_X86_64_PLT32
3284            && r_type != elfcpp::R_X86_64_PLT32_BND
3285            && r_type != elfcpp::R_X86_64_PC32_BND
3286            && r_type != elfcpp::R_X86_64_PC32)
3287           || gsym == NULL
3288           || strcmp(gsym->name(), "__tls_get_addr") != 0)
3289         {
3290           gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3291                                  _("missing expected TLS relocation"));
3292         }
3293       else
3294         {
3295           this->skip_call_tls_get_addr_ = false;
3296           return false;
3297         }
3298     }
3299
3300   if (view == NULL)
3301     return true;
3302
3303   const Sized_relobj_file<size, false>* object = relinfo->object;
3304
3305   // Pick the value to use for symbols defined in the PLT.
3306   Symbol_value<size> symval;
3307   if (gsym != NULL
3308       && gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
3309     {
3310       symval.set_output_value(target->plt_address_for_global(gsym));
3311       psymval = &symval;
3312     }
3313   else if (gsym == NULL && psymval->is_ifunc_symbol())
3314     {
3315       unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3316       if (object->local_has_plt_offset(r_sym))
3317         {
3318           symval.set_output_value(target->plt_address_for_local(object, r_sym));
3319           psymval = &symval;
3320         }
3321     }
3322
3323   const elfcpp::Elf_Xword addend = rela.get_r_addend();
3324
3325   // Get the GOT offset if needed.
3326   // The GOT pointer points to the end of the GOT section.
3327   // We need to subtract the size of the GOT section to get
3328   // the actual offset to use in the relocation.
3329   bool have_got_offset = false;
3330   unsigned int got_offset = 0;
3331   switch (r_type)
3332     {
3333     case elfcpp::R_X86_64_GOT32:
3334     case elfcpp::R_X86_64_GOT64:
3335     case elfcpp::R_X86_64_GOTPLT64:
3336     case elfcpp::R_X86_64_GOTPCREL:
3337     case elfcpp::R_X86_64_GOTPCREL64:
3338       if (gsym != NULL)
3339         {
3340           gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
3341           got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
3342         }
3343       else
3344         {
3345           unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3346           gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
3347           got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
3348                         - target->got_size());
3349         }
3350       have_got_offset = true;
3351       break;
3352
3353     default:
3354       break;
3355     }
3356
3357   switch (r_type)
3358     {
3359     case elfcpp::R_X86_64_NONE:
3360     case elfcpp::R_X86_64_GNU_VTINHERIT:
3361     case elfcpp::R_X86_64_GNU_VTENTRY:
3362       break;
3363
3364     case elfcpp::R_X86_64_64:
3365       Relocate_functions<size, false>::rela64(view, object, psymval, addend);
3366       break;
3367
3368     case elfcpp::R_X86_64_PC64:
3369       Relocate_functions<size, false>::pcrela64(view, object, psymval, addend,
3370                                               address);
3371       break;
3372
3373     case elfcpp::R_X86_64_32:
3374       // FIXME: we need to verify that value + addend fits into 32 bits:
3375       //    uint64_t x = value + addend;
3376       //    x == static_cast<uint64_t>(static_cast<uint32_t>(x))
3377       // Likewise for other <=32-bit relocations (but see R_X86_64_32S).
3378       Relocate_functions<size, false>::rela32(view, object, psymval, addend);
3379       break;
3380
3381     case elfcpp::R_X86_64_32S:
3382       // FIXME: we need to verify that value + addend fits into 32 bits:
3383       //    int64_t x = value + addend;   // note this quantity is signed!
3384       //    x == static_cast<int64_t>(static_cast<int32_t>(x))
3385       Relocate_functions<size, false>::rela32(view, object, psymval, addend);
3386       break;
3387
3388     case elfcpp::R_X86_64_PC32:
3389     case elfcpp::R_X86_64_PC32_BND:
3390       Relocate_functions<size, false>::pcrela32(view, object, psymval, addend,
3391                                                 address);
3392       break;
3393
3394     case elfcpp::R_X86_64_16:
3395       Relocate_functions<size, false>::rela16(view, object, psymval, addend);
3396       break;
3397
3398     case elfcpp::R_X86_64_PC16:
3399       Relocate_functions<size, false>::pcrela16(view, object, psymval, addend,
3400                                                 address);
3401       break;
3402
3403     case elfcpp::R_X86_64_8:
3404       Relocate_functions<size, false>::rela8(view, object, psymval, addend);
3405       break;
3406
3407     case elfcpp::R_X86_64_PC8:
3408       Relocate_functions<size, false>::pcrela8(view, object, psymval, addend,
3409                                                address);
3410       break;
3411
3412     case elfcpp::R_X86_64_PLT32:
3413     case elfcpp::R_X86_64_PLT32_BND:
3414       gold_assert(gsym == NULL
3415                   || gsym->has_plt_offset()
3416                   || gsym->final_value_is_known()
3417                   || (gsym->is_defined()
3418                       && !gsym->is_from_dynobj()
3419                       && !gsym->is_preemptible()));
3420       // Note: while this code looks the same as for R_X86_64_PC32, it
3421       // behaves differently because psymval was set to point to
3422       // the PLT entry, rather than the symbol, in Scan::global().
3423       Relocate_functions<size, false>::pcrela32(view, object, psymval, addend,
3424                                                 address);
3425       break;
3426
3427     case elfcpp::R_X86_64_PLTOFF64:
3428       {
3429         gold_assert(gsym);
3430         gold_assert(gsym->has_plt_offset()
3431                     || gsym->final_value_is_known());
3432         typename elfcpp::Elf_types<size>::Elf_Addr got_address;
3433         got_address = target->got_section(NULL, NULL)->address();
3434         Relocate_functions<size, false>::rela64(view, object, psymval,
3435                                                 addend - got_address);
3436       }
3437       break;
3438
3439     case elfcpp::R_X86_64_GOT32:
3440       gold_assert(have_got_offset);
3441       Relocate_functions<size, false>::rela32(view, got_offset, addend);
3442       break;
3443
3444     case elfcpp::R_X86_64_GOTPC32:
3445       {
3446         gold_assert(gsym);
3447         typename elfcpp::Elf_types<size>::Elf_Addr value;
3448         value = target->got_plt_section()->address();
3449         Relocate_functions<size, false>::pcrela32(view, value, addend, address);
3450       }
3451       break;
3452
3453     case elfcpp::R_X86_64_GOT64:
3454       // The ABI doc says "Like GOT64, but indicates a PLT entry is needed."
3455       // Since we always add a PLT entry, this is equivalent.
3456     case elfcpp::R_X86_64_GOTPLT64:
3457       gold_assert(have_got_offset);
3458       Relocate_functions<size, false>::rela64(view, got_offset, addend);
3459       break;
3460
3461     case elfcpp::R_X86_64_GOTPC64:
3462       {
3463         gold_assert(gsym);
3464         typename elfcpp::Elf_types<size>::Elf_Addr value;
3465         value = target->got_plt_section()->address();
3466         Relocate_functions<size, false>::pcrela64(view, value, addend, address);
3467       }
3468       break;
3469
3470     case elfcpp::R_X86_64_GOTOFF64:
3471       {
3472         typename elfcpp::Elf_types<size>::Elf_Addr value;
3473         value = (psymval->value(object, 0)
3474                  - target->got_plt_section()->address());
3475         Relocate_functions<size, false>::rela64(view, value, addend);
3476       }
3477       break;
3478
3479     case elfcpp::R_X86_64_GOTPCREL:
3480       {
3481         gold_assert(have_got_offset);
3482         typename elfcpp::Elf_types<size>::Elf_Addr value;
3483         value = target->got_plt_section()->address() + got_offset;
3484         Relocate_functions<size, false>::pcrela32(view, value, addend, address);
3485       }
3486       break;
3487
3488     case elfcpp::R_X86_64_GOTPCREL64:
3489       {
3490         gold_assert(have_got_offset);
3491         typename elfcpp::Elf_types<size>::Elf_Addr value;
3492         value = target->got_plt_section()->address() + got_offset;
3493         Relocate_functions<size, false>::pcrela64(view, value, addend, address);
3494       }
3495       break;
3496
3497     case elfcpp::R_X86_64_COPY:
3498     case elfcpp::R_X86_64_GLOB_DAT:
3499     case elfcpp::R_X86_64_JUMP_SLOT:
3500     case elfcpp::R_X86_64_RELATIVE:
3501     case elfcpp::R_X86_64_IRELATIVE:
3502       // These are outstanding tls relocs, which are unexpected when linking
3503     case elfcpp::R_X86_64_TPOFF64:
3504     case elfcpp::R_X86_64_DTPMOD64:
3505     case elfcpp::R_X86_64_TLSDESC:
3506       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3507                              _("unexpected reloc %u in object file"),
3508                              r_type);
3509       break;
3510
3511       // These are initial tls relocs, which are expected when linking
3512     case elfcpp::R_X86_64_TLSGD:            // Global-dynamic
3513     case elfcpp::R_X86_64_GOTPC32_TLSDESC:  // Global-dynamic (from ~oliva url)
3514     case elfcpp::R_X86_64_TLSDESC_CALL:
3515     case elfcpp::R_X86_64_TLSLD:            // Local-dynamic
3516     case elfcpp::R_X86_64_DTPOFF32:
3517     case elfcpp::R_X86_64_DTPOFF64:
3518     case elfcpp::R_X86_64_GOTTPOFF:         // Initial-exec
3519     case elfcpp::R_X86_64_TPOFF32:          // Local-exec
3520       this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval,
3521                          view, address, view_size);
3522       break;
3523
3524     case elfcpp::R_X86_64_SIZE32:
3525     case elfcpp::R_X86_64_SIZE64:
3526     default:
3527       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3528                              _("unsupported reloc %u"),
3529                              r_type);
3530       break;
3531     }
3532
3533   return true;
3534 }
3535
3536 // Perform a TLS relocation.
3537
3538 template<int size>
3539 inline void
3540 Target_x86_64<size>::Relocate::relocate_tls(
3541     const Relocate_info<size, false>* relinfo,
3542     Target_x86_64<size>* target,
3543     size_t relnum,
3544     const elfcpp::Rela<size, false>& rela,
3545     unsigned int r_type,
3546     const Sized_symbol<size>* gsym,
3547     const Symbol_value<size>* psymval,
3548     unsigned char* view,
3549     typename elfcpp::Elf_types<size>::Elf_Addr address,
3550     section_size_type view_size)
3551 {
3552   Output_segment* tls_segment = relinfo->layout->tls_segment();
3553
3554   const Sized_relobj_file<size, false>* object = relinfo->object;
3555   const elfcpp::Elf_Xword addend = rela.get_r_addend();
3556   elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr);
3557   bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0;
3558
3559   typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0);
3560
3561   const bool is_final = (gsym == NULL
3562                          ? !parameters->options().shared()
3563                          : gsym->final_value_is_known());
3564   tls::Tls_optimization optimized_type
3565       = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
3566   switch (r_type)
3567     {
3568     case elfcpp::R_X86_64_TLSGD:            // Global-dynamic
3569       if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3570         {
3571           // If this code sequence is used in a non-executable section,
3572           // we will not optimize the R_X86_64_DTPOFF32/64 relocation,
3573           // on the assumption that it's being used by itself in a debug
3574           // section.  Therefore, in the unlikely event that the code
3575           // sequence appears in a non-executable section, we simply
3576           // leave it unoptimized.
3577           optimized_type = tls::TLSOPT_NONE;
3578         }
3579       if (optimized_type == tls::TLSOPT_TO_LE)
3580         {
3581           if (tls_segment == NULL)
3582             {
3583               gold_assert(parameters->errors()->error_count() > 0
3584                           || issue_undefined_symbol_error(gsym));
3585               return;
3586             }
3587           this->tls_gd_to_le(relinfo, relnum, tls_segment,
3588                              rela, r_type, value, view,
3589                              view_size);
3590           break;
3591         }
3592       else
3593         {
3594           unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
3595                                    ? GOT_TYPE_TLS_OFFSET
3596                                    : GOT_TYPE_TLS_PAIR);
3597           unsigned int got_offset;
3598           if (gsym != NULL)
3599             {
3600               gold_assert(gsym->has_got_offset(got_type));
3601               got_offset = gsym->got_offset(got_type) - target->got_size();
3602             }
3603           else
3604             {
3605               unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3606               gold_assert(object->local_has_got_offset(r_sym, got_type));
3607               got_offset = (object->local_got_offset(r_sym, got_type)
3608                             - target->got_size());
3609             }
3610           if (optimized_type == tls::TLSOPT_TO_IE)
3611             {
3612               value = target->got_plt_section()->address() + got_offset;
3613               this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type,
3614                                  value, view, address, view_size);
3615               break;
3616             }
3617           else if (optimized_type == tls::TLSOPT_NONE)
3618             {
3619               // Relocate the field with the offset of the pair of GOT
3620               // entries.
3621               value = target->got_plt_section()->address() + got_offset;
3622               Relocate_functions<size, false>::pcrela32(view, value, addend,
3623                                                         address);
3624               break;
3625             }
3626         }
3627       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3628                              _("unsupported reloc %u"), r_type);
3629       break;
3630
3631     case elfcpp::R_X86_64_GOTPC32_TLSDESC:  // Global-dynamic (from ~oliva url)
3632     case elfcpp::R_X86_64_TLSDESC_CALL:
3633       if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3634         {
3635           // See above comment for R_X86_64_TLSGD.
3636           optimized_type = tls::TLSOPT_NONE;
3637         }
3638       if (optimized_type == tls::TLSOPT_TO_LE)
3639         {
3640           if (tls_segment == NULL)
3641             {
3642               gold_assert(parameters->errors()->error_count() > 0
3643                           || issue_undefined_symbol_error(gsym));
3644               return;
3645             }
3646           this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
3647                                   rela, r_type, value, view,
3648                                   view_size);
3649           break;
3650         }
3651       else
3652         {
3653           unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
3654                                    ? GOT_TYPE_TLS_OFFSET
3655                                    : GOT_TYPE_TLS_DESC);
3656           unsigned int got_offset = 0;
3657           if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC
3658               && optimized_type == tls::TLSOPT_NONE)
3659             {
3660               // We created GOT entries in the .got.tlsdesc portion of
3661               // the .got.plt section, but the offset stored in the
3662               // symbol is the offset within .got.tlsdesc.
3663               got_offset = (target->got_size()
3664                             + target->got_plt_section()->data_size());
3665             }
3666           if (gsym != NULL)
3667             {
3668               gold_assert(gsym->has_got_offset(got_type));
3669               got_offset += gsym->got_offset(got_type) - target->got_size();
3670             }
3671           else
3672             {
3673               unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3674               gold_assert(object->local_has_got_offset(r_sym, got_type));
3675               got_offset += (object->local_got_offset(r_sym, got_type)
3676                              - target->got_size());
3677             }
3678           if (optimized_type == tls::TLSOPT_TO_IE)
3679             {
3680               if (tls_segment == NULL)
3681                 {
3682                   gold_assert(parameters->errors()->error_count() > 0
3683                               || issue_undefined_symbol_error(gsym));
3684                   return;
3685                 }
3686               value = target->got_plt_section()->address() + got_offset;
3687               this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment,
3688                                       rela, r_type, value, view, address,
3689                                       view_size);
3690               break;
3691             }
3692           else if (optimized_type == tls::TLSOPT_NONE)
3693             {
3694               if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
3695                 {
3696                   // Relocate the field with the offset of the pair of GOT
3697                   // entries.
3698                   value = target->got_plt_section()->address() + got_offset;
3699                   Relocate_functions<size, false>::pcrela32(view, value, addend,
3700                                                             address);
3701                 }
3702               break;
3703             }
3704         }
3705       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3706                              _("unsupported reloc %u"), r_type);
3707       break;
3708
3709     case elfcpp::R_X86_64_TLSLD:            // Local-dynamic
3710       if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3711         {
3712           // See above comment for R_X86_64_TLSGD.
3713           optimized_type = tls::TLSOPT_NONE;
3714         }
3715       if (optimized_type == tls::TLSOPT_TO_LE)
3716         {
3717           if (tls_segment == NULL)
3718             {
3719               gold_assert(parameters->errors()->error_count() > 0
3720                           || issue_undefined_symbol_error(gsym));
3721               return;
3722             }
3723           this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type,
3724                              value, view, view_size);
3725           break;
3726         }
3727       else if (optimized_type == tls::TLSOPT_NONE)
3728         {
3729           // Relocate the field with the offset of the GOT entry for
3730           // the module index.
3731           unsigned int got_offset;
3732           got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
3733                         - target->got_size());
3734           value = target->got_plt_section()->address() + got_offset;
3735           Relocate_functions<size, false>::pcrela32(view, value, addend,
3736                                                     address);
3737           break;
3738         }
3739       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3740                              _("unsupported reloc %u"), r_type);
3741       break;
3742
3743     case elfcpp::R_X86_64_DTPOFF32:
3744       // This relocation type is used in debugging information.
3745       // In that case we need to not optimize the value.  If the
3746       // section is not executable, then we assume we should not
3747       // optimize this reloc.  See comments above for R_X86_64_TLSGD,
3748       // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
3749       // R_X86_64_TLSLD.
3750       if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
3751         {
3752           if (tls_segment == NULL)
3753             {
3754               gold_assert(parameters->errors()->error_count() > 0
3755                           || issue_undefined_symbol_error(gsym));
3756               return;
3757             }
3758           value -= tls_segment->memsz();
3759         }
3760       Relocate_functions<size, false>::rela32(view, value, addend);
3761       break;
3762
3763     case elfcpp::R_X86_64_DTPOFF64:
3764       // See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
3765       if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
3766         {
3767           if (tls_segment == NULL)
3768             {
3769               gold_assert(parameters->errors()->error_count() > 0
3770                           || issue_undefined_symbol_error(gsym));
3771               return;
3772             }
3773           value -= tls_segment->memsz();
3774         }
3775       Relocate_functions<size, false>::rela64(view, value, addend);
3776       break;
3777
3778     case elfcpp::R_X86_64_GOTTPOFF:         // Initial-exec
3779       if (optimized_type == tls::TLSOPT_TO_LE)
3780         {
3781           if (tls_segment == NULL)
3782             {
3783               gold_assert(parameters->errors()->error_count() > 0
3784                           || issue_undefined_symbol_error(gsym));
3785               return;
3786             }
3787           Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
3788                                                       tls_segment, rela,
3789                                                       r_type, value, view,
3790                                                       view_size);
3791           break;
3792         }
3793       else if (optimized_type == tls::TLSOPT_NONE)
3794         {
3795           // Relocate the field with the offset of the GOT entry for
3796           // the tp-relative offset of the symbol.
3797           unsigned int got_offset;
3798           if (gsym != NULL)
3799             {
3800               gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET));
3801               got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET)
3802                             - target->got_size());
3803             }
3804           else
3805             {
3806               unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3807               gold_assert(object->local_has_got_offset(r_sym,
3808                                                        GOT_TYPE_TLS_OFFSET));
3809               got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET)
3810                             - target->got_size());
3811             }
3812           value = target->got_plt_section()->address() + got_offset;
3813           Relocate_functions<size, false>::pcrela32(view, value, addend,
3814                                                     address);
3815           break;
3816         }
3817       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3818                              _("unsupported reloc type %u"),
3819                              r_type);
3820       break;
3821
3822     case elfcpp::R_X86_64_TPOFF32:          // Local-exec
3823       if (tls_segment == NULL)
3824         {
3825           gold_assert(parameters->errors()->error_count() > 0
3826                       || issue_undefined_symbol_error(gsym));
3827           return;
3828         }
3829       value -= tls_segment->memsz();
3830       Relocate_functions<size, false>::rela32(view, value, addend);
3831       break;
3832     }
3833 }
3834
3835 // Do a relocation in which we convert a TLS General-Dynamic to an
3836 // Initial-Exec.
3837
3838 template<int size>
3839 inline void
3840 Target_x86_64<size>::Relocate::tls_gd_to_ie(
3841     const Relocate_info<size, false>* relinfo,
3842     size_t relnum,
3843     Output_segment*,
3844     const elfcpp::Rela<size, false>& rela,
3845     unsigned int,
3846     typename elfcpp::Elf_types<size>::Elf_Addr value,
3847     unsigned char* view,
3848     typename elfcpp::Elf_types<size>::Elf_Addr address,
3849     section_size_type view_size)
3850 {
3851   // For SIZE == 64:
3852   //    .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
3853   //    .word 0x6666; rex64; call __tls_get_addr
3854   //    ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
3855   // For SIZE == 32:
3856   //    leaq foo@tlsgd(%rip),%rdi;
3857   //    .word 0x6666; rex64; call __tls_get_addr
3858   //    ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
3859
3860   tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
3861   tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3862                  (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
3863
3864   if (size == 64)
3865     {
3866       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
3867                        -4);
3868       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3869                      (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
3870       memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
3871              16);
3872     }
3873   else
3874     {
3875       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
3876                        -3);
3877       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3878                      (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
3879       memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
3880              15);
3881     }
3882
3883   const elfcpp::Elf_Xword addend = rela.get_r_addend();
3884   Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8,
3885                                             address);
3886
3887   // The next reloc should be a PLT32 reloc against __tls_get_addr.
3888   // We can skip it.
3889   this->skip_call_tls_get_addr_ = true;
3890 }
3891
3892 // Do a relocation in which we convert a TLS General-Dynamic to a
3893 // Local-Exec.
3894
3895 template<int size>
3896 inline void
3897 Target_x86_64<size>::Relocate::tls_gd_to_le(
3898     const Relocate_info<size, false>* relinfo,
3899     size_t relnum,
3900     Output_segment* tls_segment,
3901     const elfcpp::Rela<size, false>& rela,
3902     unsigned int,
3903     typename elfcpp::Elf_types<size>::Elf_Addr value,
3904     unsigned char* view,
3905     section_size_type view_size)
3906 {
3907   // For SIZE == 64:
3908   //    .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
3909   //    .word 0x6666; rex64; call __tls_get_addr
3910   //    ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
3911   // For SIZE == 32:
3912   //    leaq foo@tlsgd(%rip),%rdi;
3913   //    .word 0x6666; rex64; call __tls_get_addr
3914   //    ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
3915
3916   tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
3917   tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3918                  (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
3919
3920   if (size == 64)
3921     {
3922       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
3923                        -4);
3924       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3925                      (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
3926       memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
3927              16);
3928     }
3929   else
3930     {
3931       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
3932                        -3);
3933       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3934                      (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
3935
3936       memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
3937              15);
3938     }
3939
3940   value -= tls_segment->memsz();
3941   Relocate_functions<size, false>::rela32(view + 8, value, 0);
3942
3943   // The next reloc should be a PLT32 reloc against __tls_get_addr.
3944   // We can skip it.
3945   this->skip_call_tls_get_addr_ = true;
3946 }
3947
3948 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
3949
3950 template<int size>
3951 inline void
3952 Target_x86_64<size>::Relocate::tls_desc_gd_to_ie(
3953     const Relocate_info<size, false>* relinfo,
3954     size_t relnum,
3955     Output_segment*,
3956     const elfcpp::Rela<size, false>& rela,
3957     unsigned int r_type,
3958     typename elfcpp::Elf_types<size>::Elf_Addr value,
3959     unsigned char* view,
3960     typename elfcpp::Elf_types<size>::Elf_Addr address,
3961     section_size_type view_size)
3962 {
3963   if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
3964     {
3965       // leaq foo@tlsdesc(%rip), %rax
3966       // ==> movq foo@gottpoff(%rip), %rax
3967       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
3968       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
3969       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3970                      view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
3971       view[-2] = 0x8b;
3972       const elfcpp::Elf_Xword addend = rela.get_r_addend();
3973       Relocate_functions<size, false>::pcrela32(view, value, addend, address);
3974     }
3975   else
3976     {
3977       // call *foo@tlscall(%rax)
3978       // ==> nop; nop
3979       gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
3980       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
3981       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3982                      view[0] == 0xff && view[1] == 0x10);
3983       view[0] = 0x66;
3984       view[1] = 0x90;
3985     }
3986 }
3987
3988 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
3989
3990 template<int size>
3991 inline void
3992 Target_x86_64<size>::Relocate::tls_desc_gd_to_le(
3993     const Relocate_info<size, false>* relinfo,
3994     size_t relnum,
3995     Output_segment* tls_segment,
3996     const elfcpp::Rela<size, false>& rela,
3997     unsigned int r_type,
3998     typename elfcpp::Elf_types<size>::Elf_Addr value,
3999     unsigned char* view,
4000     section_size_type view_size)
4001 {
4002   if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
4003     {
4004       // leaq foo@tlsdesc(%rip), %rax
4005       // ==> movq foo@tpoff, %rax
4006       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4007       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4008       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4009                      view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
4010       view[-2] = 0xc7;
4011       view[-1] = 0xc0;
4012       value -= tls_segment->memsz();
4013       Relocate_functions<size, false>::rela32(view, value, 0);
4014     }
4015   else
4016     {
4017       // call *foo@tlscall(%rax)
4018       // ==> nop; nop
4019       gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
4020       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
4021       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4022                      view[0] == 0xff && view[1] == 0x10);
4023       view[0] = 0x66;
4024       view[1] = 0x90;
4025     }
4026 }
4027
4028 template<int size>
4029 inline void
4030 Target_x86_64<size>::Relocate::tls_ld_to_le(
4031     const Relocate_info<size, false>* relinfo,
4032     size_t relnum,
4033     Output_segment*,
4034     const elfcpp::Rela<size, false>& rela,
4035     unsigned int,
4036     typename elfcpp::Elf_types<size>::Elf_Addr,
4037     unsigned char* view,
4038     section_size_type view_size)
4039 {
4040   // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
4041   // For SIZE == 64:
4042   // ... leq foo@dtpoff(%rax),%reg
4043   // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
4044   // For SIZE == 32:
4045   // ... leq foo@dtpoff(%rax),%reg
4046   // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
4047
4048   tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4049   tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9);
4050
4051   tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4052                  view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d);
4053
4054   tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8);
4055
4056   if (size == 64)
4057     memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
4058   else
4059     memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12);
4060
4061   // The next reloc should be a PLT32 reloc against __tls_get_addr.
4062   // We can skip it.
4063   this->skip_call_tls_get_addr_ = true;
4064 }
4065
4066 // Do a relocation in which we convert a TLS Initial-Exec to a
4067 // Local-Exec.
4068
4069 template<int size>
4070 inline void
4071 Target_x86_64<size>::Relocate::tls_ie_to_le(
4072     const Relocate_info<size, false>* relinfo,
4073     size_t relnum,
4074     Output_segment* tls_segment,
4075     const elfcpp::Rela<size, false>& rela,
4076     unsigned int,
4077     typename elfcpp::Elf_types<size>::Elf_Addr value,
4078     unsigned char* view,
4079     section_size_type view_size)
4080 {
4081   // We need to examine the opcodes to figure out which instruction we
4082   // are looking at.
4083
4084   // movq foo@gottpoff(%rip),%reg  ==>  movq $YY,%reg
4085   // addq foo@gottpoff(%rip),%reg  ==>  addq $YY,%reg
4086
4087   tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4088   tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4089
4090   unsigned char op1 = view[-3];
4091   unsigned char op2 = view[-2];
4092   unsigned char op3 = view[-1];
4093   unsigned char reg = op3 >> 3;
4094
4095   if (op2 == 0x8b)
4096     {
4097       // movq
4098       if (op1 == 0x4c)
4099         view[-3] = 0x49;
4100       view[-2] = 0xc7;
4101       view[-1] = 0xc0 | reg;
4102     }
4103   else if (reg == 4)
4104     {
4105       // Special handling for %rsp.
4106       if (op1 == 0x4c)
4107         view[-3] = 0x49;
4108       view[-2] = 0x81;
4109       view[-1] = 0xc0 | reg;
4110     }
4111   else
4112     {
4113       // addq
4114       if (op1 == 0x4c)
4115         view[-3] = 0x4d;
4116       view[-2] = 0x8d;
4117       view[-1] = 0x80 | reg | (reg << 3);
4118     }
4119
4120   value -= tls_segment->memsz();
4121   Relocate_functions<size, false>::rela32(view, value, 0);
4122 }
4123
4124 // Relocate section data.
4125
4126 template<int size>
4127 void
4128 Target_x86_64<size>::relocate_section(
4129     const Relocate_info<size, false>* relinfo,
4130     unsigned int sh_type,
4131     const unsigned char* prelocs,
4132     size_t reloc_count,
4133     Output_section* output_section,
4134     bool needs_special_offset_handling,
4135     unsigned char* view,
4136     typename elfcpp::Elf_types<size>::Elf_Addr address,
4137     section_size_type view_size,
4138     const Reloc_symbol_changes* reloc_symbol_changes)
4139 {
4140   gold_assert(sh_type == elfcpp::SHT_RELA);
4141
4142   gold::relocate_section<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
4143                          typename Target_x86_64<size>::Relocate,
4144                          gold::Default_comdat_behavior>(
4145     relinfo,
4146     this,
4147     prelocs,
4148     reloc_count,
4149     output_section,
4150     needs_special_offset_handling,
4151     view,
4152     address,
4153     view_size,
4154     reloc_symbol_changes);
4155 }
4156
4157 // Apply an incremental relocation.  Incremental relocations always refer
4158 // to global symbols.
4159
4160 template<int size>
4161 void
4162 Target_x86_64<size>::apply_relocation(
4163     const Relocate_info<size, false>* relinfo,
4164     typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
4165     unsigned int r_type,
4166     typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
4167     const Symbol* gsym,
4168     unsigned char* view,
4169     typename elfcpp::Elf_types<size>::Elf_Addr address,
4170     section_size_type view_size)
4171 {
4172   gold::apply_relocation<size, false, Target_x86_64<size>,
4173                          typename Target_x86_64<size>::Relocate>(
4174     relinfo,
4175     this,
4176     r_offset,
4177     r_type,
4178     r_addend,
4179     gsym,
4180     view,
4181     address,
4182     view_size);
4183 }
4184
4185 // Return the size of a relocation while scanning during a relocatable
4186 // link.
4187
4188 template<int size>
4189 unsigned int
4190 Target_x86_64<size>::Relocatable_size_for_reloc::get_size_for_reloc(
4191     unsigned int r_type,
4192     Relobj* object)
4193 {
4194   switch (r_type)
4195     {
4196     case elfcpp::R_X86_64_NONE:
4197     case elfcpp::R_X86_64_GNU_VTINHERIT:
4198     case elfcpp::R_X86_64_GNU_VTENTRY:
4199     case elfcpp::R_X86_64_TLSGD:            // Global-dynamic
4200     case elfcpp::R_X86_64_GOTPC32_TLSDESC:  // Global-dynamic (from ~oliva url)
4201     case elfcpp::R_X86_64_TLSDESC_CALL:
4202     case elfcpp::R_X86_64_TLSLD:            // Local-dynamic
4203     case elfcpp::R_X86_64_DTPOFF32:
4204     case elfcpp::R_X86_64_DTPOFF64:
4205     case elfcpp::R_X86_64_GOTTPOFF:         // Initial-exec
4206     case elfcpp::R_X86_64_TPOFF32:          // Local-exec
4207       return 0;
4208
4209     case elfcpp::R_X86_64_64:
4210     case elfcpp::R_X86_64_PC64:
4211     case elfcpp::R_X86_64_GOTOFF64:
4212     case elfcpp::R_X86_64_GOTPC64:
4213     case elfcpp::R_X86_64_PLTOFF64:
4214     case elfcpp::R_X86_64_GOT64:
4215     case elfcpp::R_X86_64_GOTPCREL64:
4216     case elfcpp::R_X86_64_GOTPCREL:
4217     case elfcpp::R_X86_64_GOTPLT64:
4218       return 8;
4219
4220     case elfcpp::R_X86_64_32:
4221     case elfcpp::R_X86_64_32S:
4222     case elfcpp::R_X86_64_PC32:
4223     case elfcpp::R_X86_64_PC32_BND:
4224     case elfcpp::R_X86_64_PLT32:
4225     case elfcpp::R_X86_64_PLT32_BND:
4226     case elfcpp::R_X86_64_GOTPC32:
4227     case elfcpp::R_X86_64_GOT32:
4228       return 4;
4229
4230     case elfcpp::R_X86_64_16:
4231     case elfcpp::R_X86_64_PC16:
4232       return 2;
4233
4234     case elfcpp::R_X86_64_8:
4235     case elfcpp::R_X86_64_PC8:
4236       return 1;
4237
4238     case elfcpp::R_X86_64_COPY:
4239     case elfcpp::R_X86_64_GLOB_DAT:
4240     case elfcpp::R_X86_64_JUMP_SLOT:
4241     case elfcpp::R_X86_64_RELATIVE:
4242     case elfcpp::R_X86_64_IRELATIVE:
4243       // These are outstanding tls relocs, which are unexpected when linking
4244     case elfcpp::R_X86_64_TPOFF64:
4245     case elfcpp::R_X86_64_DTPMOD64:
4246     case elfcpp::R_X86_64_TLSDESC:
4247       object->error(_("unexpected reloc %u in object file"), r_type);
4248       return 0;
4249
4250     case elfcpp::R_X86_64_SIZE32:
4251     case elfcpp::R_X86_64_SIZE64:
4252     default:
4253       object->error(_("unsupported reloc %u against local symbol"), r_type);
4254       return 0;
4255     }
4256 }
4257
4258 // Scan the relocs during a relocatable link.
4259
4260 template<int size>
4261 void
4262 Target_x86_64<size>::scan_relocatable_relocs(
4263     Symbol_table* symtab,
4264     Layout* layout,
4265     Sized_relobj_file<size, false>* object,
4266     unsigned int data_shndx,
4267     unsigned int sh_type,
4268     const unsigned char* prelocs,
4269     size_t reloc_count,
4270     Output_section* output_section,
4271     bool needs_special_offset_handling,
4272     size_t local_symbol_count,
4273     const unsigned char* plocal_symbols,
4274     Relocatable_relocs* rr)
4275 {
4276   gold_assert(sh_type == elfcpp::SHT_RELA);
4277
4278   typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA,
4279     Relocatable_size_for_reloc> Scan_relocatable_relocs;
4280
4281   gold::scan_relocatable_relocs<size, false, elfcpp::SHT_RELA,
4282       Scan_relocatable_relocs>(
4283     symtab,
4284     layout,
4285     object,
4286     data_shndx,
4287     prelocs,
4288     reloc_count,
4289     output_section,
4290     needs_special_offset_handling,
4291     local_symbol_count,
4292     plocal_symbols,
4293     rr);
4294 }
4295
4296 // Relocate a section during a relocatable link.
4297
4298 template<int size>
4299 void
4300 Target_x86_64<size>::relocate_relocs(
4301     const Relocate_info<size, false>* relinfo,
4302     unsigned int sh_type,
4303     const unsigned char* prelocs,
4304     size_t reloc_count,
4305     Output_section* output_section,
4306     typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
4307     const Relocatable_relocs* rr,
4308     unsigned char* view,
4309     typename elfcpp::Elf_types<size>::Elf_Addr view_address,
4310     section_size_type view_size,
4311     unsigned char* reloc_view,
4312     section_size_type reloc_view_size)
4313 {
4314   gold_assert(sh_type == elfcpp::SHT_RELA);
4315
4316   gold::relocate_relocs<size, false, elfcpp::SHT_RELA>(
4317     relinfo,
4318     prelocs,
4319     reloc_count,
4320     output_section,
4321     offset_in_output_section,
4322     rr,
4323     view,
4324     view_address,
4325     view_size,
4326     reloc_view,
4327     reloc_view_size);
4328 }
4329
4330 // Return the value to use for a dynamic which requires special
4331 // treatment.  This is how we support equality comparisons of function
4332 // pointers across shared library boundaries, as described in the
4333 // processor specific ABI supplement.
4334
4335 template<int size>
4336 uint64_t
4337 Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const
4338 {
4339   gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
4340   return this->plt_address_for_global(gsym);
4341 }
4342
4343 // Return a string used to fill a code section with nops to take up
4344 // the specified length.
4345
4346 template<int size>
4347 std::string
4348 Target_x86_64<size>::do_code_fill(section_size_type length) const
4349 {
4350   if (length >= 16)
4351     {
4352       // Build a jmpq instruction to skip over the bytes.
4353       unsigned char jmp[5];
4354       jmp[0] = 0xe9;
4355       elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
4356       return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
4357               + std::string(length - 5, static_cast<char>(0x90)));
4358     }
4359
4360   // Nop sequences of various lengths.
4361   const char nop1[1] = { '\x90' };                 // nop
4362   const char nop2[2] = { '\x66', '\x90' };         // xchg %ax %ax
4363   const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax)
4364   const char nop4[4] = { '\x0f', '\x1f', '\x40',   // nop 0(%rax)
4365                          '\x00'};
4366   const char nop5[5] = { '\x0f', '\x1f', '\x44',   // nop 0(%rax,%rax,1)
4367                          '\x00', '\x00' };
4368   const char nop6[6] = { '\x66', '\x0f', '\x1f',   // nopw 0(%rax,%rax,1)
4369                          '\x44', '\x00', '\x00' };
4370   const char nop7[7] = { '\x0f', '\x1f', '\x80',   // nopl 0L(%rax)
4371                          '\x00', '\x00', '\x00',
4372                          '\x00' };
4373   const char nop8[8] = { '\x0f', '\x1f', '\x84',   // nopl 0L(%rax,%rax,1)
4374                          '\x00', '\x00', '\x00',
4375                          '\x00', '\x00' };
4376   const char nop9[9] = { '\x66', '\x0f', '\x1f',   // nopw 0L(%rax,%rax,1)
4377                          '\x84', '\x00', '\x00',
4378                          '\x00', '\x00', '\x00' };
4379   const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
4380                            '\x1f', '\x84', '\x00',
4381                            '\x00', '\x00', '\x00',
4382                            '\x00' };
4383   const char nop11[11] = { '\x66', '\x66', '\x2e', // data16
4384                            '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
4385                            '\x00', '\x00', '\x00',
4386                            '\x00', '\x00' };
4387   const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16
4388                            '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
4389                            '\x84', '\x00', '\x00',
4390                            '\x00', '\x00', '\x00' };
4391   const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16
4392                            '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
4393                            '\x1f', '\x84', '\x00',
4394                            '\x00', '\x00', '\x00',
4395                            '\x00' };
4396   const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16
4397                            '\x66', '\x66', '\x2e', // data16
4398                            '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
4399                            '\x00', '\x00', '\x00',
4400                            '\x00', '\x00' };
4401   const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16
4402                            '\x66', '\x66', '\x66', // data16; data16
4403                            '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
4404                            '\x84', '\x00', '\x00',
4405                            '\x00', '\x00', '\x00' };
4406
4407   const char* nops[16] = {
4408     NULL,
4409     nop1, nop2, nop3, nop4, nop5, nop6, nop7,
4410     nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15
4411   };
4412
4413   return std::string(nops[length], length);
4414 }
4415
4416 // Return the addend to use for a target specific relocation.  The
4417 // only target specific relocation is R_X86_64_TLSDESC for a local
4418 // symbol.  We want to set the addend is the offset of the local
4419 // symbol in the TLS segment.
4420
4421 template<int size>
4422 uint64_t
4423 Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type,
4424                                      uint64_t) const
4425 {
4426   gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
4427   uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
4428   gold_assert(intarg < this->tlsdesc_reloc_info_.size());
4429   const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
4430   const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
4431   gold_assert(psymval->is_tls_symbol());
4432   // The value of a TLS symbol is the offset in the TLS segment.
4433   return psymval->value(ti.object, 0);
4434 }
4435
4436 // Return the value to use for the base of a DW_EH_PE_datarel offset
4437 // in an FDE.  Solaris and SVR4 use DW_EH_PE_datarel because their
4438 // assembler can not write out the difference between two labels in
4439 // different sections, so instead of using a pc-relative value they
4440 // use an offset from the GOT.
4441
4442 template<int size>
4443 uint64_t
4444 Target_x86_64<size>::do_ehframe_datarel_base() const
4445 {
4446   gold_assert(this->global_offset_table_ != NULL);
4447   Symbol* sym = this->global_offset_table_;
4448   Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym);
4449   return ssym->value();
4450 }
4451
4452 // FNOFFSET in section SHNDX in OBJECT is the start of a function
4453 // compiled with -fsplit-stack.  The function calls non-split-stack
4454 // code.  We have to change the function so that it always ensures
4455 // that it has enough stack space to run some random function.
4456
4457 template<int size>
4458 void
4459 Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx,
4460                                         section_offset_type fnoffset,
4461                                         section_size_type fnsize,
4462                                         unsigned char* view,
4463                                         section_size_type view_size,
4464                                         std::string* from,
4465                                         std::string* to) const
4466 {
4467   // The function starts with a comparison of the stack pointer and a
4468   // field in the TCB.  This is followed by a jump.
4469
4470   // cmp %fs:NN,%rsp
4471   if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5)
4472       && fnsize > 9)
4473     {
4474       // We will call __morestack if the carry flag is set after this
4475       // comparison.  We turn the comparison into an stc instruction
4476       // and some nops.
4477       view[fnoffset] = '\xf9';
4478       this->set_view_to_nop(view, view_size, fnoffset + 1, 8);
4479     }
4480   // lea NN(%rsp),%r10
4481   // lea NN(%rsp),%r11
4482   else if ((this->match_view(view, view_size, fnoffset,
4483                              "\x4c\x8d\x94\x24", 4)
4484             || this->match_view(view, view_size, fnoffset,
4485                                 "\x4c\x8d\x9c\x24", 4))
4486            && fnsize > 8)
4487     {
4488       // This is loading an offset from the stack pointer for a
4489       // comparison.  The offset is negative, so we decrease the
4490       // offset by the amount of space we need for the stack.  This
4491       // means we will avoid calling __morestack if there happens to
4492       // be plenty of space on the stack already.
4493       unsigned char* pval = view + fnoffset + 4;
4494       uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval);
4495       val -= parameters->options().split_stack_adjust_size();
4496       elfcpp::Swap_unaligned<32, false>::writeval(pval, val);
4497     }
4498   else
4499     {
4500       if (!object->has_no_split_stack())
4501         object->error(_("failed to match split-stack sequence at "
4502                         "section %u offset %0zx"),
4503                       shndx, static_cast<size_t>(fnoffset));
4504       return;
4505     }
4506
4507   // We have to change the function so that it calls
4508   // __morestack_non_split instead of __morestack.  The former will
4509   // allocate additional stack space.
4510   *from = "__morestack";
4511   *to = "__morestack_non_split";
4512 }
4513
4514 // The selector for x86_64 object files.  Note this is never instantiated
4515 // directly.  It's only used in Target_selector_x86_64_nacl, below.
4516
4517 template<int size>
4518 class Target_selector_x86_64 : public Target_selector_freebsd
4519 {
4520 public:
4521   Target_selector_x86_64()
4522     : Target_selector_freebsd(elfcpp::EM_X86_64, size, false,
4523                               (size == 64
4524                                ? "elf64-x86-64" : "elf32-x86-64"),
4525                               (size == 64
4526                                ? "elf64-x86-64-freebsd"
4527                                : "elf32-x86-64-freebsd"),
4528                               (size == 64 ? "elf_x86_64" : "elf32_x86_64"))
4529   { }
4530
4531   Target*
4532   do_instantiate_target()
4533   { return new Target_x86_64<size>(); }
4534
4535 };
4536
4537 // NaCl variant.  It uses different PLT contents.
4538
4539 template<int size>
4540 class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size>
4541 {
4542  public:
4543   Output_data_plt_x86_64_nacl(Layout* layout,
4544                               Output_data_got<64, false>* got,
4545                               Output_data_got_plt_x86_64* got_plt,
4546                               Output_data_space* got_irelative)
4547     : Output_data_plt_x86_64<size>(layout, plt_entry_size,
4548                                    got, got_plt, got_irelative)
4549   { }
4550
4551   Output_data_plt_x86_64_nacl(Layout* layout,
4552                               Output_data_got<64, false>* got,
4553                               Output_data_got_plt_x86_64* got_plt,
4554                               Output_data_space* got_irelative,
4555                               unsigned int plt_count)
4556     : Output_data_plt_x86_64<size>(layout, plt_entry_size,
4557                                    got, got_plt, got_irelative,
4558                                    plt_count)
4559   { }
4560
4561  protected:
4562   virtual unsigned int
4563   do_get_plt_entry_size() const
4564   { return plt_entry_size; }
4565
4566   virtual void
4567   do_add_eh_frame(Layout* layout)
4568   {
4569     layout->add_eh_frame_for_plt(this,
4570                                  this->plt_eh_frame_cie,
4571                                  this->plt_eh_frame_cie_size,
4572                                  plt_eh_frame_fde,
4573                                  plt_eh_frame_fde_size);
4574   }
4575
4576   virtual void
4577   do_fill_first_plt_entry(unsigned char* pov,
4578                           typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
4579                           typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
4580
4581   virtual unsigned int
4582   do_fill_plt_entry(unsigned char* pov,
4583                     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4584                     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4585                     unsigned int got_offset,
4586                     unsigned int plt_offset,
4587                     unsigned int plt_index);
4588
4589   virtual void
4590   do_fill_tlsdesc_entry(unsigned char* pov,
4591                         typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4592                         typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4593                         typename elfcpp::Elf_types<size>::Elf_Addr got_base,
4594                         unsigned int tlsdesc_got_offset,
4595                         unsigned int plt_offset);
4596
4597  private:
4598   // The size of an entry in the PLT.
4599   static const int plt_entry_size = 64;
4600
4601   // The first entry in the PLT.
4602   static const unsigned char first_plt_entry[plt_entry_size];
4603
4604   // Other entries in the PLT for an executable.
4605   static const unsigned char plt_entry[plt_entry_size];
4606
4607   // The reserved TLSDESC entry in the PLT for an executable.
4608   static const unsigned char tlsdesc_plt_entry[plt_entry_size];
4609
4610   // The .eh_frame unwind information for the PLT.
4611   static const int plt_eh_frame_fde_size = 32;
4612   static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
4613 };
4614
4615 template<int size>
4616 class Target_x86_64_nacl : public Target_x86_64<size>
4617 {
4618  public:
4619   Target_x86_64_nacl()
4620     : Target_x86_64<size>(&x86_64_nacl_info)
4621   { }
4622
4623   virtual Output_data_plt_x86_64<size>*
4624   do_make_data_plt(Layout* layout,
4625                    Output_data_got<64, false>* got,
4626                    Output_data_got_plt_x86_64* got_plt,
4627                    Output_data_space* got_irelative)
4628   {
4629     return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
4630                                                  got_irelative);
4631   }
4632
4633   virtual Output_data_plt_x86_64<size>*
4634   do_make_data_plt(Layout* layout,
4635                    Output_data_got<64, false>* got,
4636                    Output_data_got_plt_x86_64* got_plt,
4637                    Output_data_space* got_irelative,
4638                    unsigned int plt_count)
4639   {
4640     return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
4641                                                  got_irelative,
4642                                                  plt_count);
4643   }
4644
4645   virtual std::string
4646   do_code_fill(section_size_type length) const;
4647
4648  private:
4649   static const Target::Target_info x86_64_nacl_info;
4650 };
4651
4652 template<>
4653 const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info =
4654 {
4655   64,                   // size
4656   false,                // is_big_endian
4657   elfcpp::EM_X86_64,    // machine_code
4658   false,                // has_make_symbol
4659   false,                // has_resolve
4660   true,                 // has_code_fill
4661   true,                 // is_default_stack_executable
4662   true,                 // can_icf_inline_merge_sections
4663   '\0',                 // wrap_char
4664   "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker
4665   0x20000,              // default_text_segment_address
4666   0x10000,              // abi_pagesize (overridable by -z max-page-size)
4667   0x10000,              // common_pagesize (overridable by -z common-page-size)
4668   true,                 // isolate_execinstr
4669   0x10000000,           // rosegment_gap
4670   elfcpp::SHN_UNDEF,    // small_common_shndx
4671   elfcpp::SHN_X86_64_LCOMMON,   // large_common_shndx
4672   0,                    // small_common_section_flags
4673   elfcpp::SHF_X86_64_LARGE,     // large_common_section_flags
4674   NULL,                 // attributes_section
4675   NULL,                 // attributes_vendor
4676   "_start"              // entry_symbol_name
4677 };
4678
4679 template<>
4680 const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info =
4681 {
4682   32,                   // size
4683   false,                // is_big_endian
4684   elfcpp::EM_X86_64,    // machine_code
4685   false,                // has_make_symbol
4686   false,                // has_resolve
4687   true,                 // has_code_fill
4688   true,                 // is_default_stack_executable
4689   true,                 // can_icf_inline_merge_sections
4690   '\0',                 // wrap_char
4691   "/lib/ld-nacl-x86-64.so.1", // dynamic_linker
4692   0x20000,              // default_text_segment_address
4693   0x10000,              // abi_pagesize (overridable by -z max-page-size)
4694   0x10000,              // common_pagesize (overridable by -z common-page-size)
4695   true,                 // isolate_execinstr
4696   0x10000000,           // rosegment_gap
4697   elfcpp::SHN_UNDEF,    // small_common_shndx
4698   elfcpp::SHN_X86_64_LCOMMON,   // large_common_shndx
4699   0,                    // small_common_section_flags
4700   elfcpp::SHF_X86_64_LARGE,     // large_common_section_flags
4701   NULL,                 // attributes_section
4702   NULL,                 // attributes_vendor
4703   "_start"              // entry_symbol_name
4704 };
4705
4706 #define NACLMASK        0xe0            // 32-byte alignment mask.
4707
4708 // The first entry in the PLT.
4709
4710 template<int size>
4711 const unsigned char
4712 Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] =
4713 {
4714   0xff, 0x35,                         // pushq contents of memory address
4715   0, 0, 0, 0,                         // replaced with address of .got + 8
4716   0x4c, 0x8b, 0x1d,                   // mov GOT+16(%rip), %r11
4717   0, 0, 0, 0,                         // replaced with address of .got + 16
4718   0x41, 0x83, 0xe3, NACLMASK,         // and $-32, %r11d
4719   0x4d, 0x01, 0xfb,                   // add %r15, %r11
4720   0x41, 0xff, 0xe3,                   // jmpq *%r11
4721
4722   // 9-byte nop sequence to pad out to the next 32-byte boundary.
4723   0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1)
4724
4725   // 32 bytes of nop to pad out to the standard size
4726   0x66, 0x66, 0x66, 0x66, 0x66, 0x66,    // excess data32 prefixes
4727   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4728   0x66, 0x66, 0x66, 0x66, 0x66, 0x66,    // excess data32 prefixes
4729   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4730   0x66,                                  // excess data32 prefix
4731   0x90                                   // nop
4732 };
4733
4734 template<int size>
4735 void
4736 Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry(
4737     unsigned char* pov,
4738     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4739     typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
4740 {
4741   memcpy(pov, first_plt_entry, plt_entry_size);
4742   elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
4743                                               (got_address + 8
4744                                                - (plt_address + 2 + 4)));
4745   elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
4746                                               (got_address + 16
4747                                                - (plt_address + 9 + 4)));
4748 }
4749
4750 // Subsequent entries in the PLT.
4751
4752 template<int size>
4753 const unsigned char
4754 Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] =
4755 {
4756   0x4c, 0x8b, 0x1d,              // mov name@GOTPCREL(%rip),%r11
4757   0, 0, 0, 0,                    // replaced with address of symbol in .got
4758   0x41, 0x83, 0xe3, NACLMASK,    // and $-32, %r11d
4759   0x4d, 0x01, 0xfb,              // add %r15, %r11
4760   0x41, 0xff, 0xe3,              // jmpq *%r11
4761
4762   // 15-byte nop sequence to pad out to the next 32-byte boundary.
4763   0x66, 0x66, 0x66, 0x66, 0x66, 0x66,    // excess data32 prefixes
4764   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4765
4766   // Lazy GOT entries point here (32-byte aligned).
4767   0x68,                       // pushq immediate
4768   0, 0, 0, 0,                 // replaced with index into relocation table
4769   0xe9,                       // jmp relative
4770   0, 0, 0, 0,                 // replaced with offset to start of .plt0
4771
4772   // 22 bytes of nop to pad out to the standard size.
4773   0x66, 0x66, 0x66, 0x66, 0x66, 0x66,    // excess data32 prefixes
4774   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4775   0x0f, 0x1f, 0x80, 0, 0, 0, 0,          // nopl 0x0(%rax)
4776 };
4777
4778 template<int size>
4779 unsigned int
4780 Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry(
4781     unsigned char* pov,
4782     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4783     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4784     unsigned int got_offset,
4785     unsigned int plt_offset,
4786     unsigned int plt_index)
4787 {
4788   memcpy(pov, plt_entry, plt_entry_size);
4789   elfcpp::Swap_unaligned<32, false>::writeval(pov + 3,
4790                                               (got_address + got_offset
4791                                                - (plt_address + plt_offset
4792                                                   + 3 + 4)));
4793
4794   elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index);
4795   elfcpp::Swap_unaligned<32, false>::writeval(pov + 38,
4796                                               - (plt_offset + 38 + 4));
4797
4798   return 32;
4799 }
4800
4801 // The reserved TLSDESC entry in the PLT.
4802
4803 template<int size>
4804 const unsigned char
4805 Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] =
4806 {
4807   0xff, 0x35,                   // pushq x(%rip)
4808   0, 0, 0, 0,   // replaced with address of linkmap GOT entry (at PLTGOT + 8)
4809   0x4c, 0x8b, 0x1d,             // mov y(%rip),%r11
4810   0, 0, 0, 0,   // replaced with offset of reserved TLSDESC_GOT entry
4811   0x41, 0x83, 0xe3, NACLMASK,   // and $-32, %r11d
4812   0x4d, 0x01, 0xfb,             // add %r15, %r11
4813   0x41, 0xff, 0xe3,             // jmpq *%r11
4814
4815   // 41 bytes of nop to pad out to the standard size.
4816   0x66, 0x66, 0x66, 0x66, 0x66, 0x66,    // excess data32 prefixes
4817   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4818   0x66, 0x66, 0x66, 0x66, 0x66, 0x66,    // excess data32 prefixes
4819   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4820   0x66, 0x66,                            // excess data32 prefixes
4821   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4822 };
4823
4824 template<int size>
4825 void
4826 Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry(
4827     unsigned char* pov,
4828     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4829     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4830     typename elfcpp::Elf_types<size>::Elf_Addr got_base,
4831     unsigned int tlsdesc_got_offset,
4832     unsigned int plt_offset)
4833 {
4834   memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
4835   elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
4836                                               (got_address + 8
4837                                                - (plt_address + plt_offset
4838                                                   + 2 + 4)));
4839   elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
4840                                               (got_base
4841                                                + tlsdesc_got_offset
4842                                                - (plt_address + plt_offset
4843                                                   + 9 + 4)));
4844 }
4845
4846 // The .eh_frame unwind information for the PLT.
4847
4848 template<int size>
4849 const unsigned char
4850 Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
4851 {
4852   0, 0, 0, 0,                           // Replaced with offset to .plt.
4853   0, 0, 0, 0,                           // Replaced with size of .plt.
4854   0,                                    // Augmentation size.
4855   elfcpp::DW_CFA_def_cfa_offset, 16,    // DW_CFA_def_cfa_offset: 16.
4856   elfcpp::DW_CFA_advance_loc + 6,       // Advance 6 to __PLT__ + 6.
4857   elfcpp::DW_CFA_def_cfa_offset, 24,    // DW_CFA_def_cfa_offset: 24.
4858   elfcpp::DW_CFA_advance_loc + 58,      // Advance 58 to __PLT__ + 64.
4859   elfcpp::DW_CFA_def_cfa_expression,    // DW_CFA_def_cfa_expression.
4860   13,                                   // Block length.
4861   elfcpp::DW_OP_breg7, 8,               // Push %rsp + 8.
4862   elfcpp::DW_OP_breg16, 0,              // Push %rip.
4863   elfcpp::DW_OP_const1u, 63,            // Push 0x3f.
4864   elfcpp::DW_OP_and,                    // & (%rip & 0x3f).
4865   elfcpp::DW_OP_const1u, 37,            // Push 0x25.
4866   elfcpp::DW_OP_ge,                     // >= ((%rip & 0x3f) >= 0x25)
4867   elfcpp::DW_OP_lit3,                   // Push 3.
4868   elfcpp::DW_OP_shl,                    // << (((%rip & 0x3f) >= 0x25) << 3)
4869   elfcpp::DW_OP_plus,                   // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8
4870   elfcpp::DW_CFA_nop,                   // Align to 32 bytes.
4871   elfcpp::DW_CFA_nop
4872 };
4873
4874 // Return a string used to fill a code section with nops.
4875 // For NaCl, long NOPs are only valid if they do not cross
4876 // bundle alignment boundaries, so keep it simple with one-byte NOPs.
4877 template<int size>
4878 std::string
4879 Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const
4880 {
4881   return std::string(length, static_cast<char>(0x90));
4882 }
4883
4884 // The selector for x86_64-nacl object files.
4885
4886 template<int size>
4887 class Target_selector_x86_64_nacl
4888   : public Target_selector_nacl<Target_selector_x86_64<size>,
4889                                 Target_x86_64_nacl<size> >
4890 {
4891  public:
4892   Target_selector_x86_64_nacl()
4893     : Target_selector_nacl<Target_selector_x86_64<size>,
4894                            Target_x86_64_nacl<size> >("x86-64",
4895                                                       size == 64
4896                                                       ? "elf64-x86-64-nacl"
4897                                                       : "elf32-x86-64-nacl",
4898                                                       size == 64
4899                                                       ? "elf_x86_64_nacl"
4900                                                       : "elf32_x86_64_nacl")
4901   { }
4902 };
4903
4904 Target_selector_x86_64_nacl<64> target_selector_x86_64;
4905 Target_selector_x86_64_nacl<32> target_selector_x32;
4906
4907 } // End anonymous namespace.