gold/x86_64.cc

   1 // x86_64.cc -- x86_64 target support for gold.
   2
   3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012
   4 // Free Software Foundation, Inc.
   5 // Written by Ian Lance Taylor <iant@google.com>.
   6
   7 // This file is part of gold.
   8
   9 // This program is free software; you can redistribute it and/or modify
  10 // it under the terms of the GNU General Public License as published by
  11 // the Free Software Foundation; either version 3 of the License, or
  12 // (at your option) any later version.
  13
  14 // This program is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License
  20 // along with this program; if not, write to the Free Software
  21 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  22 // MA 02110-1301, USA.
  23
  24 #include "gold.h"
  25
  26 #include <cstring>
  27
  28 #include "elfcpp.h"
  29 #include "dwarf.h"
  30 #include "parameters.h"
  31 #include "reloc.h"
  32 #include "x86_64.h"
  33 #include "object.h"
  34 #include "symtab.h"
  35 #include "layout.h"
  36 #include "output.h"
  37 #include "copy-relocs.h"
  38 #include "target.h"
  39 #include "target-reloc.h"
  40 #include "target-select.h"
  41 #include "tls.h"
  42 #include "freebsd.h"
  43 #include "nacl.h"
  44 #include "gc.h"
  45 #include "icf.h"
  46
  47 namespace
  48 {
  49
  50 using namespace gold;
  51
  52 // A class to handle the PLT data.
  53 // This is an abstract base class that handles most of the linker details
  54 // but does not know the actual contents of PLT entries.  The derived
  55 // classes below fill in those details.
  56
  57 template<int size>
  58 class Output_data_plt_x86_64 : public Output_section_data
  59 {
  60  public:
  61   typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
  62
  63   Output_data_plt_x86_64(Layout* layout, uint64_t addralign,
  64                          Output_data_got<64, false>* got,
  65                          Output_data_space* got_plt,
  66                          Output_data_space* got_irelative)
  67     : Output_section_data(addralign), layout_(layout), tlsdesc_rel_(NULL),
  68       irelative_rel_(NULL), got_(got), got_plt_(got_plt),
  69       got_irelative_(got_irelative), count_(0), irelative_count_(0),
  70       tlsdesc_got_offset_(-1U), free_list_()
  71   { this->init(layout); }
  72
  73   Output_data_plt_x86_64(Layout* layout, uint64_t plt_entry_size,
  74                          Output_data_got<64, false>* got,
  75                          Output_data_space* got_plt,
  76                          Output_data_space* got_irelative,
  77                          unsigned int plt_count)
  78     : Output_section_data((plt_count + 1) * plt_entry_size,
  79                           plt_entry_size, false),
  80       layout_(layout), tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got),
  81       got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count),
  82       irelative_count_(0), tlsdesc_got_offset_(-1U), free_list_()
  83   {
  84     this->init(layout);
  85
  86     // Initialize the free list and reserve the first entry.
  87     this->free_list_.init((plt_count + 1) * plt_entry_size, false);
  88     this->free_list_.remove(0, plt_entry_size);
  89   }
  90
  91   // Initialize the PLT section.
  92   void
  93   init(Layout* layout);
  94
  95   // Add an entry to the PLT.
  96   void
  97   add_entry(Symbol_table*, Layout*, Symbol* gsym);
  98
  99   // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
 100   unsigned int
 101   add_local_ifunc_entry(Symbol_table* symtab, Layout*,
 102                         Sized_relobj_file<size, false>* relobj,
 103                         unsigned int local_sym_index);
 104
 105   // Add the relocation for a PLT entry.
 106   void
 107   add_relocation(Symbol_table*, Layout*, Symbol* gsym,
 108                  unsigned int got_offset);
 109
 110   // Add the reserved TLSDESC_PLT entry to the PLT.
 111   void
 112   reserve_tlsdesc_entry(unsigned int got_offset)
 113   { this->tlsdesc_got_offset_ = got_offset; }
 114
 115   // Return true if a TLSDESC_PLT entry has been reserved.
 116   bool
 117   has_tlsdesc_entry() const
 118   { return this->tlsdesc_got_offset_ != -1U; }
 119
 120   // Return the GOT offset for the reserved TLSDESC_PLT entry.
 121   unsigned int
 122   get_tlsdesc_got_offset() const
 123   { return this->tlsdesc_got_offset_; }
 124
 125   // Return the offset of the reserved TLSDESC_PLT entry.
 126   unsigned int
 127   get_tlsdesc_plt_offset() const
 128   {
 129     return ((this->count_ + this->irelative_count_ + 1)
 130             * this->get_plt_entry_size());
 131   }
 132
 133   // Return the .rela.plt section data.
 134   Reloc_section*
 135   rela_plt()
 136   { return this->rel_; }
 137
 138   // Return where the TLSDESC relocations should go.
 139   Reloc_section*
 140   rela_tlsdesc(Layout*);
 141
 142   // Return where the IRELATIVE relocations should go in the PLT
 143   // relocations.
 144   Reloc_section*
 145   rela_irelative(Symbol_table*, Layout*);
 146
 147   // Return whether we created a section for IRELATIVE relocations.
 148   bool
 149   has_irelative_section() const
 150   { return this->irelative_rel_ != NULL; }
 151
 152   // Return the number of PLT entries.
 153   unsigned int
 154   entry_count() const
 155   { return this->count_ + this->irelative_count_; }
 156
 157   // Return the offset of the first non-reserved PLT entry.
 158   unsigned int
 159   first_plt_entry_offset()
 160   { return this->get_plt_entry_size(); }
 161
 162   // Return the size of a PLT entry.
 163   unsigned int
 164   get_plt_entry_size() const
 165   { return this->do_get_plt_entry_size(); }
 166
 167   // Reserve a slot in the PLT for an existing symbol in an incremental update.
 168   void
 169   reserve_slot(unsigned int plt_index)
 170   {
 171     this->free_list_.remove((plt_index + 1) * this->get_plt_entry_size(),
 172                             (plt_index + 2) * this->get_plt_entry_size());
 173   }
 174
 175   // Return the PLT address to use for a global symbol.
 176   uint64_t
 177   address_for_global(const Symbol*);
 178
 179   // Return the PLT address to use for a local symbol.
 180   uint64_t
 181   address_for_local(const Relobj*, unsigned int symndx);
 182
 183   // Add .eh_frame information for the PLT.
 184   void
 185   add_eh_frame(Layout* layout)
 186   { this->do_add_eh_frame(layout); }
 187
 188  protected:
 189   // Fill in the first PLT entry.
 190   void
 191   fill_first_plt_entry(unsigned char* pov,
 192                        typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 193                        typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
 194   { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
 195
 196   // Fill in a normal PLT entry.  Returns the offset into the entry that
 197   // should be the initial GOT slot value.
 198   unsigned int
 199   fill_plt_entry(unsigned char* pov,
 200                  typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 201                  typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
 202                  unsigned int got_offset,
 203                  unsigned int plt_offset,
 204                  unsigned int plt_index)
 205   {
 206     return this->do_fill_plt_entry(pov, got_address, plt_address,
 207                                    got_offset, plt_offset, plt_index);
 208   }
 209
 210   // Fill in the reserved TLSDESC PLT entry.
 211   void
 212   fill_tlsdesc_entry(unsigned char* pov,
 213                      typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 214                      typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
 215                      typename elfcpp::Elf_types<size>::Elf_Addr got_base,
 216                      unsigned int tlsdesc_got_offset,
 217                      unsigned int plt_offset)
 218   {
 219     this->do_fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
 220                                 tlsdesc_got_offset, plt_offset);
 221   }
 222
 223   virtual unsigned int
 224   do_get_plt_entry_size() const = 0;
 225
 226   virtual void
 227   do_fill_first_plt_entry(unsigned char* pov,
 228                           typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
 229                           typename elfcpp::Elf_types<size>::Elf_Addr plt_addr)
 230     = 0;
 231
 232   virtual unsigned int
 233   do_fill_plt_entry(unsigned char* pov,
 234                     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 235                     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
 236                     unsigned int got_offset,
 237                     unsigned int plt_offset,
 238                     unsigned int plt_index) = 0;
 239
 240   virtual void
 241   do_fill_tlsdesc_entry(unsigned char* pov,
 242                         typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 243                         typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
 244                         typename elfcpp::Elf_types<size>::Elf_Addr got_base,
 245                         unsigned int tlsdesc_got_offset,
 246                         unsigned int plt_offset) = 0;
 247
 248   virtual void
 249   do_add_eh_frame(Layout* layout) = 0;
 250
 251   void
 252   do_adjust_output_section(Output_section* os);
 253
 254   // Write to a map file.
 255   void
 256   do_print_to_mapfile(Mapfile* mapfile) const
 257   { mapfile->print_output_data(this, _("** PLT")); }
 258
 259   // The CIE of the .eh_frame unwind information for the PLT.
 260   static const int plt_eh_frame_cie_size = 16;
 261   static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size];
 262
 263  private:
 264   // Set the final size.
 265   void
 266   set_final_data_size();
 267
 268   // Write out the PLT data.
 269   void
 270   do_write(Output_file*);
 271
 272   // A pointer to the Layout class, so that we can find the .dynamic
 273   // section when we write out the GOT PLT section.
 274   Layout* layout_;
 275   // The reloc section.
 276   Reloc_section* rel_;
 277   // The TLSDESC relocs, if necessary.  These must follow the regular
 278   // PLT relocs.
 279   Reloc_section* tlsdesc_rel_;
 280   // The IRELATIVE relocs, if necessary.  These must follow the
 281   // regular PLT relocations and the TLSDESC relocations.
 282   Reloc_section* irelative_rel_;
 283   // The .got section.
 284   Output_data_got<64, false>* got_;
 285   // The .got.plt section.
 286   Output_data_space* got_plt_;
 287   // The part of the .got.plt section used for IRELATIVE relocs.
 288   Output_data_space* got_irelative_;
 289   // The number of PLT entries.
 290   unsigned int count_;
 291   // Number of PLT entries with R_X86_64_IRELATIVE relocs.  These
 292   // follow the regular PLT entries.
 293   unsigned int irelative_count_;
 294   // Offset of the reserved TLSDESC_GOT entry when needed.
 295   unsigned int tlsdesc_got_offset_;
 296   // List of available regions within the section, for incremental
 297   // update links.
 298   Free_list free_list_;
 299 };
 300
 301 template<int size>
 302 class Output_data_plt_x86_64_standard : public Output_data_plt_x86_64<size>
 303 {
 304  public:
 305   Output_data_plt_x86_64_standard(Layout* layout,
 306                                   Output_data_got<64, false>* got,
 307                                   Output_data_space* got_plt,
 308                                   Output_data_space* got_irelative)
 309     : Output_data_plt_x86_64<size>(layout, plt_entry_size,
 310                                    got, got_plt, got_irelative)
 311   { }
 312
 313   Output_data_plt_x86_64_standard(Layout* layout,
 314                                   Output_data_got<64, false>* got,
 315                                   Output_data_space* got_plt,
 316                                   Output_data_space* got_irelative,
 317                                   unsigned int plt_count)
 318     : Output_data_plt_x86_64<size>(layout, plt_entry_size,
 319                                    got, got_plt, got_irelative,
 320                                    plt_count)
 321   { }
 322
 323  protected:
 324   virtual unsigned int
 325   do_get_plt_entry_size() const
 326   { return plt_entry_size; }
 327
 328   virtual void
 329   do_add_eh_frame(Layout* layout)
 330   {
 331     layout->add_eh_frame_for_plt(this,
 332                                  this->plt_eh_frame_cie,
 333                                  this->plt_eh_frame_cie_size,
 334                                  plt_eh_frame_fde,
 335                                  plt_eh_frame_fde_size);
 336   }
 337
 338   virtual void
 339   do_fill_first_plt_entry(unsigned char* pov,
 340                           typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
 341                           typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
 342
 343   virtual unsigned int
 344   do_fill_plt_entry(unsigned char* pov,
 345                     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 346                     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
 347                     unsigned int got_offset,
 348                     unsigned int plt_offset,
 349                     unsigned int plt_index);
 350
 351   virtual void
 352   do_fill_tlsdesc_entry(unsigned char* pov,
 353                         typename elfcpp::Elf_types<size>::Elf_Addr got_address,
 354                         typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
 355                         typename elfcpp::Elf_types<size>::Elf_Addr got_base,
 356                         unsigned int tlsdesc_got_offset,
 357                         unsigned int plt_offset);
 358
 359  private:
 360   // The size of an entry in the PLT.
 361   static const int plt_entry_size = 16;
 362
 363   // The first entry in the PLT.
 364   // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
 365   // procedure linkage table for both programs and shared objects."
 366   static const unsigned char first_plt_entry[plt_entry_size];
 367
 368   // Other entries in the PLT for an executable.
 369   static const unsigned char plt_entry[plt_entry_size];
 370
 371   // The reserved TLSDESC entry in the PLT for an executable.
 372   static const unsigned char tlsdesc_plt_entry[plt_entry_size];
 373
 374   // The .eh_frame unwind information for the PLT.
 375   static const int plt_eh_frame_fde_size = 32;
 376   static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
 377 };
 378
 379 // The x86_64 target class.
 380 // See the ABI at
 381 //   http://www.x86-64.org/documentation/abi.pdf
 382 // TLS info comes from
 383 //   http://people.redhat.com/drepper/tls.pdf
 384 //   http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
 385
 386 template<int size>
 387 class Target_x86_64 : public Sized_target<size, false>
 388 {
 389  public:
 390   // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
 391   // uses only Elf64_Rela relocation entries with explicit addends."
 392   typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
 393
 394   Target_x86_64(const Target::Target_info* info = &x86_64_info)
 395     : Sized_target<size, false>(info),
 396       got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
 397       got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL),
 398       rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY),
 399       dynbss_(NULL), got_mod_index_offset_(-1U), tlsdesc_reloc_info_(),
 400       tls_base_symbol_defined_(false)
 401   { }
 402
 403   // Hook for a new output section.
 404   void
 405   do_new_output_section(Output_section*) const;
 406
 407   // Scan the relocations to look for symbol adjustments.
 408   void
 409   gc_process_relocs(Symbol_table* symtab,
 410                     Layout* layout,
 411                     Sized_relobj_file<size, false>* object,
 412                     unsigned int data_shndx,
 413                     unsigned int sh_type,
 414                     const unsigned char* prelocs,
 415                     size_t reloc_count,
 416                     Output_section* output_section,
 417                     bool needs_special_offset_handling,
 418                     size_t local_symbol_count,
 419                     const unsigned char* plocal_symbols);
 420
 421   // Scan the relocations to look for symbol adjustments.
 422   void
 423   scan_relocs(Symbol_table* symtab,
 424               Layout* layout,
 425               Sized_relobj_file<size, false>* object,
 426               unsigned int data_shndx,
 427               unsigned int sh_type,
 428               const unsigned char* prelocs,
 429               size_t reloc_count,
 430               Output_section* output_section,
 431               bool needs_special_offset_handling,
 432               size_t local_symbol_count,
 433               const unsigned char* plocal_symbols);
 434
 435   // Finalize the sections.
 436   void
 437   do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
 438
 439   // Return the value to use for a dynamic which requires special
 440   // treatment.
 441   uint64_t
 442   do_dynsym_value(const Symbol*) const;
 443
 444   // Relocate a section.
 445   void
 446   relocate_section(const Relocate_info<size, false>*,
 447                    unsigned int sh_type,
 448                    const unsigned char* prelocs,
 449                    size_t reloc_count,
 450                    Output_section* output_section,
 451                    bool needs_special_offset_handling,
 452                    unsigned char* view,
 453                    typename elfcpp::Elf_types<size>::Elf_Addr view_address,
 454                    section_size_type view_size,
 455                    const Reloc_symbol_changes*);
 456
 457   // Scan the relocs during a relocatable link.
 458   void
 459   scan_relocatable_relocs(Symbol_table* symtab,
 460                           Layout* layout,
 461                           Sized_relobj_file<size, false>* object,
 462                           unsigned int data_shndx,
 463                           unsigned int sh_type,
 464                           const unsigned char* prelocs,
 465                           size_t reloc_count,
 466                           Output_section* output_section,
 467                           bool needs_special_offset_handling,
 468                           size_t local_symbol_count,
 469                           const unsigned char* plocal_symbols,
 470                           Relocatable_relocs*);
 471
 472   // Relocate a section during a relocatable link.
 473   void
 474   relocate_for_relocatable(
 475       const Relocate_info<size, false>*,
 476       unsigned int sh_type,
 477       const unsigned char* prelocs,
 478       size_t reloc_count,
 479       Output_section* output_section,
 480       off_t offset_in_output_section,
 481       const Relocatable_relocs*,
 482       unsigned char* view,
 483       typename elfcpp::Elf_types<size>::Elf_Addr view_address,
 484       section_size_type view_size,
 485       unsigned char* reloc_view,
 486       section_size_type reloc_view_size);
 487
 488   // Return a string used to fill a code section with nops.
 489   std::string
 490   do_code_fill(section_size_type length) const;
 491
 492   // Return whether SYM is defined by the ABI.
 493   bool
 494   do_is_defined_by_abi(const Symbol* sym) const
 495   { return strcmp(sym->name(), "__tls_get_addr") == 0; }
 496
 497   // Return the symbol index to use for a target specific relocation.
 498   // The only target specific relocation is R_X86_64_TLSDESC for a
 499   // local symbol, which is an absolute reloc.
 500   unsigned int
 501   do_reloc_symbol_index(void*, unsigned int r_type) const
 502   {
 503     gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
 504     return 0;
 505   }
 506
 507   // Return the addend to use for a target specific relocation.
 508   uint64_t
 509   do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
 510
 511   // Return the PLT section.
 512   uint64_t
 513   do_plt_address_for_global(const Symbol* gsym) const
 514   { return this->plt_section()->address_for_global(gsym); }
 515
 516   uint64_t
 517   do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
 518   { return this->plt_section()->address_for_local(relobj, symndx); }
 519
 520   // This function should be defined in targets that can use relocation
 521   // types to determine (implemented in local_reloc_may_be_function_pointer
 522   // and global_reloc_may_be_function_pointer)
 523   // if a function's pointer is taken.  ICF uses this in safe mode to only
 524   // fold those functions whose pointer is defintely not taken.  For x86_64
 525   // pie binaries, safe ICF cannot be done by looking at relocation types.
 526   bool
 527   do_can_check_for_function_pointers() const
 528   { return !parameters->options().pie(); }
 529
 530   // Return the base for a DW_EH_PE_datarel encoding.
 531   uint64_t
 532   do_ehframe_datarel_base() const;
 533
 534   // Adjust -fsplit-stack code which calls non-split-stack code.
 535   void
 536   do_calls_non_split(Relobj* object, unsigned int shndx,
 537                      section_offset_type fnoffset, section_size_type fnsize,
 538                      unsigned char* view, section_size_type view_size,
 539                      std::string* from, std::string* to) const;
 540
 541   // Return the size of the GOT section.
 542   section_size_type
 543   got_size() const
 544   {
 545     gold_assert(this->got_ != NULL);
 546     return this->got_->data_size();
 547   }
 548
 549   // Return the number of entries in the GOT.
 550   unsigned int
 551   got_entry_count() const
 552   {
 553     if (this->got_ == NULL)
 554       return 0;
 555     return this->got_size() / 8;
 556   }
 557
 558   // Return the number of entries in the PLT.
 559   unsigned int
 560   plt_entry_count() const;
 561
 562   // Return the offset of the first non-reserved PLT entry.
 563   unsigned int
 564   first_plt_entry_offset() const;
 565
 566   // Return the size of each PLT entry.
 567   unsigned int
 568   plt_entry_size() const;
 569
 570   // Create the GOT section for an incremental update.
 571   Output_data_got_base*
 572   init_got_plt_for_update(Symbol_table* symtab,
 573                           Layout* layout,
 574                           unsigned int got_count,
 575                           unsigned int plt_count);
 576
 577   // Reserve a GOT entry for a local symbol, and regenerate any
 578   // necessary dynamic relocations.
 579   void
 580   reserve_local_got_entry(unsigned int got_index,
 581                           Sized_relobj<size, false>* obj,
 582                           unsigned int r_sym,
 583                           unsigned int got_type);
 584
 585   // Reserve a GOT entry for a global symbol, and regenerate any
 586   // necessary dynamic relocations.
 587   void
 588   reserve_global_got_entry(unsigned int got_index, Symbol* gsym,
 589                            unsigned int got_type);
 590
 591   // Register an existing PLT entry for a global symbol.
 592   void
 593   register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index,
 594                             Symbol* gsym);
 595
 596   // Force a COPY relocation for a given symbol.
 597   void
 598   emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t);
 599
 600   // Apply an incremental relocation.
 601   void
 602   apply_relocation(const Relocate_info<size, false>* relinfo,
 603                    typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
 604                    unsigned int r_type,
 605                    typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
 606                    const Symbol* gsym,
 607                    unsigned char* view,
 608                    typename elfcpp::Elf_types<size>::Elf_Addr address,
 609                    section_size_type view_size);
 610
 611   // Add a new reloc argument, returning the index in the vector.
 612   size_t
 613   add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym)
 614   {
 615     this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym));
 616     return this->tlsdesc_reloc_info_.size() - 1;
 617   }
 618
 619   Output_data_plt_x86_64<size>*
 620   make_data_plt(Layout* layout,
 621                 Output_data_got<64, false>* got,
 622                 Output_data_space* got_plt,
 623                 Output_data_space* got_irelative)
 624   {
 625     return this->do_make_data_plt(layout, got, got_plt, got_irelative);
 626   }
 627
 628   Output_data_plt_x86_64<size>*
 629   make_data_plt(Layout* layout,
 630                 Output_data_got<64, false>* got,
 631                 Output_data_space* got_plt,
 632                 Output_data_space* got_irelative,
 633                 unsigned int plt_count)
 634   {
 635     return this->do_make_data_plt(layout, got, got_plt, got_irelative,
 636                                   plt_count);
 637   }
 638
 639   virtual Output_data_plt_x86_64<size>*
 640   do_make_data_plt(Layout* layout,
 641                    Output_data_got<64, false>* got,
 642                    Output_data_space* got_plt,
 643                    Output_data_space* got_irelative)
 644   {
 645     return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
 646                                                      got_irelative);
 647   }
 648
 649   virtual Output_data_plt_x86_64<size>*
 650   do_make_data_plt(Layout* layout,
 651                    Output_data_got<64, false>* got,
 652                    Output_data_space* got_plt,
 653                    Output_data_space* got_irelative,
 654                    unsigned int plt_count)
 655   {
 656     return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
 657                                                      got_irelative,
 658                                                      plt_count);
 659   }
 660
 661  private:
 662   // The class which scans relocations.
 663   class Scan
 664   {
 665   public:
 666     Scan()
 667       : issued_non_pic_error_(false)
 668     { }
 669
 670     static inline int
 671     get_reference_flags(unsigned int r_type);
 672
 673     inline void
 674     local(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
 675           Sized_relobj_file<size, false>* object,
 676           unsigned int data_shndx,
 677           Output_section* output_section,
 678           const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
 679           const elfcpp::Sym<size, false>& lsym);
 680
 681     inline void
 682     global(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
 683            Sized_relobj_file<size, false>* object,
 684            unsigned int data_shndx,
 685            Output_section* output_section,
 686            const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
 687            Symbol* gsym);
 688
 689     inline bool
 690     local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
 691                                         Target_x86_64* target,
 692                                         Sized_relobj_file<size, false>* object,
 693                                         unsigned int data_shndx,
 694                                         Output_section* output_section,
 695                                         const elfcpp::Rela<size, false>& reloc,
 696                                         unsigned int r_type,
 697                                         const elfcpp::Sym<size, false>& lsym);
 698
 699     inline bool
 700     global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
 701                                          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,
 706                                          unsigned int r_type,
 707                                          Symbol* gsym);
 708
 709   private:
 710     static void
 711     unsupported_reloc_local(Sized_relobj_file<size, false>*,
 712                             unsigned int r_type);
 713
 714     static void
 715     unsupported_reloc_global(Sized_relobj_file<size, false>*,
 716                              unsigned int r_type, Symbol*);
 717
 718     void
 719     check_non_pic(Relobj*, unsigned int r_type, Symbol*);
 720
 721     inline bool
 722     possible_function_pointer_reloc(unsigned int r_type);
 723
 724     bool
 725     reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*,
 726                               unsigned int r_type);
 727
 728     // Whether we have issued an error about a non-PIC compilation.
 729     bool issued_non_pic_error_;
 730   };
 731
 732   // The class which implements relocation.
 733   class Relocate
 734   {
 735    public:
 736     Relocate()
 737       : skip_call_tls_get_addr_(false)
 738     { }
 739
 740     ~Relocate()
 741     {
 742       if (this->skip_call_tls_get_addr_)
 743         {
 744           // FIXME: This needs to specify the location somehow.
 745           gold_error(_("missing expected TLS relocation"));
 746         }
 747     }
 748
 749     // Do a relocation.  Return false if the caller should not issue
 750     // any warnings about this relocation.
 751     inline bool
 752     relocate(const Relocate_info<size, false>*, Target_x86_64*,
 753              Output_section*,
 754              size_t relnum, const elfcpp::Rela<size, false>&,
 755              unsigned int r_type, const Sized_symbol<size>*,
 756              const Symbol_value<size>*,
 757              unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
 758              section_size_type);
 759
 760    private:
 761     // Do a TLS relocation.
 762     inline void
 763     relocate_tls(const Relocate_info<size, false>*, Target_x86_64*,
 764                  size_t relnum, const elfcpp::Rela<size, false>&,
 765                  unsigned int r_type, const Sized_symbol<size>*,
 766                  const Symbol_value<size>*,
 767                  unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
 768                  section_size_type);
 769
 770     // Do a TLS General-Dynamic to Initial-Exec transition.
 771     inline void
 772     tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
 773                  Output_segment* tls_segment,
 774                  const elfcpp::Rela<size, false>&, unsigned int r_type,
 775                  typename elfcpp::Elf_types<size>::Elf_Addr value,
 776                  unsigned char* view,
 777                  typename elfcpp::Elf_types<size>::Elf_Addr,
 778                  section_size_type view_size);
 779
 780     // Do a TLS General-Dynamic to Local-Exec transition.
 781     inline void
 782     tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
 783                  Output_segment* tls_segment,
 784                  const elfcpp::Rela<size, false>&, unsigned int r_type,
 785                  typename elfcpp::Elf_types<size>::Elf_Addr value,
 786                  unsigned char* view,
 787                  section_size_type view_size);
 788
 789     // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
 790     inline void
 791     tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
 792                       Output_segment* tls_segment,
 793                       const elfcpp::Rela<size, false>&, unsigned int r_type,
 794                       typename elfcpp::Elf_types<size>::Elf_Addr value,
 795                       unsigned char* view,
 796                       typename elfcpp::Elf_types<size>::Elf_Addr,
 797                       section_size_type view_size);
 798
 799     // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
 800     inline void
 801     tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
 802                       Output_segment* tls_segment,
 803                       const elfcpp::Rela<size, false>&, unsigned int r_type,
 804                       typename elfcpp::Elf_types<size>::Elf_Addr value,
 805                       unsigned char* view,
 806                       section_size_type view_size);
 807
 808     // Do a TLS Local-Dynamic to Local-Exec transition.
 809     inline void
 810     tls_ld_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 TLS Initial-Exec to Local-Exec transition.
 818     static inline void
 819     tls_ie_to_le(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                  section_size_type view_size);
 825
 826     // This is set if we should skip the next reloc, which should be a
 827     // PLT32 reloc against ___tls_get_addr.
 828     bool skip_call_tls_get_addr_;
 829   };
 830
 831   // A class which returns the size required for a relocation type,
 832   // used while scanning relocs during a relocatable link.
 833   class Relocatable_size_for_reloc
 834   {
 835    public:
 836     unsigned int
 837     get_size_for_reloc(unsigned int, Relobj*);
 838   };
 839
 840   // Adjust TLS relocation type based on the options and whether this
 841   // is a local symbol.
 842   static tls::Tls_optimization
 843   optimize_tls_reloc(bool is_final, int r_type);
 844
 845   // Get the GOT section, creating it if necessary.
 846   Output_data_got<64, false>*
 847   got_section(Symbol_table*, Layout*);
 848
 849   // Get the GOT PLT section.
 850   Output_data_space*
 851   got_plt_section() const
 852   {
 853     gold_assert(this->got_plt_ != NULL);
 854     return this->got_plt_;
 855   }
 856
 857   // Get the GOT section for TLSDESC entries.
 858   Output_data_got<64, false>*
 859   got_tlsdesc_section() const
 860   {
 861     gold_assert(this->got_tlsdesc_ != NULL);
 862     return this->got_tlsdesc_;
 863   }
 864
 865   // Create the PLT section.
 866   void
 867   make_plt_section(Symbol_table* symtab, Layout* layout);
 868
 869   // Create a PLT entry for a global symbol.
 870   void
 871   make_plt_entry(Symbol_table*, Layout*, Symbol*);
 872
 873   // Create a PLT entry for a local STT_GNU_IFUNC symbol.
 874   void
 875   make_local_ifunc_plt_entry(Symbol_table*, Layout*,
 876                              Sized_relobj_file<size, false>* relobj,
 877                              unsigned int local_sym_index);
 878
 879   // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
 880   void
 881   define_tls_base_symbol(Symbol_table*, Layout*);
 882
 883   // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
 884   void
 885   reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout);
 886
 887   // Create a GOT entry for the TLS module index.
 888   unsigned int
 889   got_mod_index_entry(Symbol_table* symtab, Layout* layout,
 890                       Sized_relobj_file<size, false>* object);
 891
 892   // Get the PLT section.
 893   Output_data_plt_x86_64<size>*
 894   plt_section() const
 895   {
 896     gold_assert(this->plt_ != NULL);
 897     return this->plt_;
 898   }
 899
 900   // Get the dynamic reloc section, creating it if necessary.
 901   Reloc_section*
 902   rela_dyn_section(Layout*);
 903
 904   // Get the section to use for TLSDESC relocations.
 905   Reloc_section*
 906   rela_tlsdesc_section(Layout*) const;
 907
 908   // Get the section to use for IRELATIVE relocations.
 909   Reloc_section*
 910   rela_irelative_section(Layout*);
 911
 912   // Add a potential copy relocation.
 913   void
 914   copy_reloc(Symbol_table* symtab, Layout* layout,
 915              Sized_relobj_file<size, false>* object,
 916              unsigned int shndx, Output_section* output_section,
 917              Symbol* sym, const elfcpp::Rela<size, false>& reloc)
 918   {
 919     this->copy_relocs_.copy_reloc(symtab, layout,
 920                                   symtab->get_sized_symbol<size>(sym),
 921                                   object, shndx, output_section,
 922                                   reloc, this->rela_dyn_section(layout));
 923   }
 924
 925   // Information about this specific target which we pass to the
 926   // general Target structure.
 927   static const Target::Target_info x86_64_info;
 928
 929   // The types of GOT entries needed for this platform.
 930   // These values are exposed to the ABI in an incremental link.
 931   // Do not renumber existing values without changing the version
 932   // number of the .gnu_incremental_inputs section.
 933   enum Got_type
 934   {
 935     GOT_TYPE_STANDARD = 0,      // GOT entry for a regular symbol
 936     GOT_TYPE_TLS_OFFSET = 1,    // GOT entry for TLS offset
 937     GOT_TYPE_TLS_PAIR = 2,      // GOT entry for TLS module/offset pair
 938     GOT_TYPE_TLS_DESC = 3       // GOT entry for TLS_DESC pair
 939   };
 940
 941   // This type is used as the argument to the target specific
 942   // relocation routines.  The only target specific reloc is
 943   // R_X86_64_TLSDESC against a local symbol.
 944   struct Tlsdesc_info
 945   {
 946     Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym)
 947       : object(a_object), r_sym(a_r_sym)
 948     { }
 949
 950     // The object in which the local symbol is defined.
 951     Sized_relobj_file<size, false>* object;
 952     // The local symbol index in the object.
 953     unsigned int r_sym;
 954   };
 955
 956   // The GOT section.
 957   Output_data_got<64, false>* got_;
 958   // The PLT section.
 959   Output_data_plt_x86_64<size>* plt_;
 960   // The GOT PLT section.
 961   Output_data_space* got_plt_;
 962   // The GOT section for IRELATIVE relocations.
 963   Output_data_space* got_irelative_;
 964   // The GOT section for TLSDESC relocations.
 965   Output_data_got<64, false>* got_tlsdesc_;
 966   // The _GLOBAL_OFFSET_TABLE_ symbol.
 967   Symbol* global_offset_table_;
 968   // The dynamic reloc section.
 969   Reloc_section* rela_dyn_;
 970   // The section to use for IRELATIVE relocs.
 971   Reloc_section* rela_irelative_;
 972   // Relocs saved to avoid a COPY reloc.
 973   Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_;
 974   // Space for variables copied with a COPY reloc.
 975   Output_data_space* dynbss_;
 976   // Offset of the GOT entry for the TLS module index.
 977   unsigned int got_mod_index_offset_;
 978   // We handle R_X86_64_TLSDESC against a local symbol as a target
 979   // specific relocation.  Here we store the object and local symbol
 980   // index for the relocation.
 981   std::vector<Tlsdesc_info> tlsdesc_reloc_info_;
 982   // True if the _TLS_MODULE_BASE_ symbol has been defined.
 983   bool tls_base_symbol_defined_;
 984 };
 985
 986 template<>
 987 const Target::Target_info Target_x86_64<64>::x86_64_info =
 988 {
 989   64,                   // size
 990   false,                // is_big_endian
 991   elfcpp::EM_X86_64,    // machine_code
 992   false,                // has_make_symbol
 993   false,                // has_resolve
 994   true,                 // has_code_fill
 995   true,                 // is_default_stack_executable
 996   true,                 // can_icf_inline_merge_sections
 997   '\0',                 // wrap_char
 998   "/lib/ld64.so.1",     // program interpreter
 999   0x400000,             // default_text_segment_address
1000   0x1000,               // abi_pagesize (overridable by -z max-page-size)
1001   0x1000,               // common_pagesize (overridable by -z common-page-size)
1002   false,                // isolate_execinstr
1003   0,                    // rosegment_gap
1004   elfcpp::SHN_UNDEF,    // small_common_shndx
1005   elfcpp::SHN_X86_64_LCOMMON,   // large_common_shndx
1006   0,                    // small_common_section_flags
1007   elfcpp::SHF_X86_64_LARGE,     // large_common_section_flags
1008   NULL,                 // attributes_section
1009   NULL                  // attributes_vendor
1010 };
1011
1012 template<>
1013 const Target::Target_info Target_x86_64<32>::x86_64_info =
1014 {
1015   32,                   // 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   "/libx32/ldx32.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 };
1037
1038 // This is called when a new output section is created.  This is where
1039 // we handle the SHF_X86_64_LARGE.
1040
1041 template<int size>
1042 void
1043 Target_x86_64<size>::do_new_output_section(Output_section* os) const
1044 {
1045   if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0)
1046     os->set_is_large_section();
1047 }
1048
1049 // Get the GOT section, creating it if necessary.
1050
1051 template<int size>
1052 Output_data_got<64, false>*
1053 Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout)
1054 {
1055   if (this->got_ == NULL)
1056     {
1057       gold_assert(symtab != NULL && layout != NULL);
1058
1059       // When using -z now, we can treat .got.plt as a relro section.
1060       // Without -z now, it is modified after program startup by lazy
1061       // PLT relocations.
1062       bool is_got_plt_relro = parameters->options().now();
1063       Output_section_order got_order = (is_got_plt_relro
1064                                         ? ORDER_RELRO
1065                                         : ORDER_RELRO_LAST);
1066       Output_section_order got_plt_order = (is_got_plt_relro
1067                                             ? ORDER_RELRO
1068                                             : ORDER_NON_RELRO_FIRST);
1069
1070       this->got_ = new Output_data_got<64, false>();
1071
1072       layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1073                                       (elfcpp::SHF_ALLOC
1074                                        | elfcpp::SHF_WRITE),
1075                                       this->got_, got_order, true);
1076
1077       this->got_plt_ = new Output_data_space(8, "** GOT PLT");
1078       layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1079                                       (elfcpp::SHF_ALLOC
1080                                        | elfcpp::SHF_WRITE),
1081                                       this->got_plt_, got_plt_order,
1082                                       is_got_plt_relro);
1083
1084       // The first three entries are reserved.
1085       this->got_plt_->set_current_data_size(3 * 8);
1086
1087       if (!is_got_plt_relro)
1088         {
1089           // Those bytes can go into the relro segment.
1090           layout->increase_relro(3 * 8);
1091         }
1092
1093       // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1094       this->global_offset_table_ =
1095         symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1096                                       Symbol_table::PREDEFINED,
1097                                       this->got_plt_,
1098                                       0, 0, elfcpp::STT_OBJECT,
1099                                       elfcpp::STB_LOCAL,
1100                                       elfcpp::STV_HIDDEN, 0,
1101                                       false, false);
1102
1103       // If there are any IRELATIVE relocations, they get GOT entries
1104       // in .got.plt after the jump slot entries.
1105       this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT");
1106       layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1107                                       (elfcpp::SHF_ALLOC
1108                                        | elfcpp::SHF_WRITE),
1109                                       this->got_irelative_,
1110                                       got_plt_order, is_got_plt_relro);
1111
1112       // If there are any TLSDESC relocations, they get GOT entries in
1113       // .got.plt after the jump slot and IRELATIVE entries.
1114       this->got_tlsdesc_ = new Output_data_got<64, false>();
1115       layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1116                                       (elfcpp::SHF_ALLOC
1117                                        | elfcpp::SHF_WRITE),
1118                                       this->got_tlsdesc_,
1119                                       got_plt_order, is_got_plt_relro);
1120     }
1121
1122   return this->got_;
1123 }
1124
1125 // Get the dynamic reloc section, creating it if necessary.
1126
1127 template<int size>
1128 typename Target_x86_64<size>::Reloc_section*
1129 Target_x86_64<size>::rela_dyn_section(Layout* layout)
1130 {
1131   if (this->rela_dyn_ == NULL)
1132     {
1133       gold_assert(layout != NULL);
1134       this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
1135       layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
1136                                       elfcpp::SHF_ALLOC, this->rela_dyn_,
1137                                       ORDER_DYNAMIC_RELOCS, false);
1138     }
1139   return this->rela_dyn_;
1140 }
1141
1142 // Get the section to use for IRELATIVE relocs, creating it if
1143 // necessary.  These go in .rela.dyn, but only after all other dynamic
1144 // relocations.  They need to follow the other dynamic relocations so
1145 // that they can refer to global variables initialized by those
1146 // relocs.
1147
1148 template<int size>
1149 typename Target_x86_64<size>::Reloc_section*
1150 Target_x86_64<size>::rela_irelative_section(Layout* layout)
1151 {
1152   if (this->rela_irelative_ == NULL)
1153     {
1154       // Make sure we have already created the dynamic reloc section.
1155       this->rela_dyn_section(layout);
1156       this->rela_irelative_ = new Reloc_section(false);
1157       layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
1158                                       elfcpp::SHF_ALLOC, this->rela_irelative_,
1159                                       ORDER_DYNAMIC_RELOCS, false);
1160       gold_assert(this->rela_dyn_->output_section()
1161                   == this->rela_irelative_->output_section());
1162     }
1163   return this->rela_irelative_;
1164 }
1165
1166 // Initialize the PLT section.
1167
1168 template<int size>
1169 void
1170 Output_data_plt_x86_64<size>::init(Layout* layout)
1171 {
1172   this->rel_ = new Reloc_section(false);
1173   layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1174                                   elfcpp::SHF_ALLOC, this->rel_,
1175                                   ORDER_DYNAMIC_PLT_RELOCS, false);
1176 }
1177
1178 template<int size>
1179 void
1180 Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os)
1181 {
1182   os->set_entsize(this->get_plt_entry_size());
1183 }
1184
1185 // Add an entry to the PLT.
1186
1187 template<int size>
1188 void
1189 Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout,
1190                                         Symbol* gsym)
1191 {
1192   gold_assert(!gsym->has_plt_offset());
1193
1194   unsigned int plt_index;
1195   off_t plt_offset;
1196   section_offset_type got_offset;
1197
1198   unsigned int* pcount;
1199   unsigned int offset;
1200   unsigned int reserved;
1201   Output_data_space* got;
1202   if (gsym->type() == elfcpp::STT_GNU_IFUNC
1203       && gsym->can_use_relative_reloc(false))
1204     {
1205       pcount = &this->irelative_count_;
1206       offset = 0;
1207       reserved = 0;
1208       got = this->got_irelative_;
1209     }
1210   else
1211     {
1212       pcount = &this->count_;
1213       offset = 1;
1214       reserved = 3;
1215       got = this->got_plt_;
1216     }
1217
1218   if (!this->is_data_size_valid())
1219     {
1220       // Note that when setting the PLT offset for a non-IRELATIVE
1221       // entry we skip the initial reserved PLT entry.
1222       plt_index = *pcount + offset;
1223       plt_offset = plt_index * this->get_plt_entry_size();
1224
1225       ++*pcount;
1226
1227       got_offset = (plt_index - offset + reserved) * 8;
1228       gold_assert(got_offset == got->current_data_size());
1229
1230       // Every PLT entry needs a GOT entry which points back to the PLT
1231       // entry (this will be changed by the dynamic linker, normally
1232       // lazily when the function is called).
1233       got->set_current_data_size(got_offset + 8);
1234     }
1235   else
1236     {
1237       // FIXME: This is probably not correct for IRELATIVE relocs.
1238
1239       // For incremental updates, find an available slot.
1240       plt_offset = this->free_list_.allocate(this->get_plt_entry_size(),
1241                                              this->get_plt_entry_size(), 0);
1242       if (plt_offset == -1)
1243         gold_fallback(_("out of patch space (PLT);"
1244                         " relink with --incremental-full"));
1245
1246       // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
1247       // can be calculated from the PLT index, adjusting for the three
1248       // reserved entries at the beginning of the GOT.
1249       plt_index = plt_offset / this->get_plt_entry_size() - 1;
1250       got_offset = (plt_index - offset + reserved) * 8;
1251     }
1252
1253   gsym->set_plt_offset(plt_offset);
1254
1255   // Every PLT entry needs a reloc.
1256   this->add_relocation(symtab, layout, gsym, got_offset);
1257
1258   // Note that we don't need to save the symbol.  The contents of the
1259   // PLT are independent of which symbols are used.  The symbols only
1260   // appear in the relocations.
1261 }
1262
1263 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.  Return
1264 // the PLT offset.
1265
1266 template<int size>
1267 unsigned int
1268 Output_data_plt_x86_64<size>::add_local_ifunc_entry(
1269     Symbol_table* symtab,
1270     Layout* layout,
1271     Sized_relobj_file<size, false>* relobj,
1272     unsigned int local_sym_index)
1273 {
1274   unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size();
1275   ++this->irelative_count_;
1276
1277   section_offset_type got_offset = this->got_irelative_->current_data_size();
1278
1279   // Every PLT entry needs a GOT entry which points back to the PLT
1280   // entry.
1281   this->got_irelative_->set_current_data_size(got_offset + 8);
1282
1283   // Every PLT entry needs a reloc.
1284   Reloc_section* rela = this->rela_irelative(symtab, layout);
1285   rela->add_symbolless_local_addend(relobj, local_sym_index,
1286                                     elfcpp::R_X86_64_IRELATIVE,
1287                                     this->got_irelative_, got_offset, 0);
1288
1289   return plt_offset;
1290 }
1291
1292 // Add the relocation for a PLT entry.
1293
1294 template<int size>
1295 void
1296 Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab,
1297                                              Layout* layout,
1298                                              Symbol* gsym,
1299                                              unsigned int got_offset)
1300 {
1301   if (gsym->type() == elfcpp::STT_GNU_IFUNC
1302       && gsym->can_use_relative_reloc(false))
1303     {
1304       Reloc_section* rela = this->rela_irelative(symtab, layout);
1305       rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE,
1306                                          this->got_irelative_, got_offset, 0);
1307     }
1308   else
1309     {
1310       gsym->set_needs_dynsym_entry();
1311       this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_,
1312                              got_offset, 0);
1313     }
1314 }
1315
1316 // Return where the TLSDESC relocations should go, creating it if
1317 // necessary.  These follow the JUMP_SLOT relocations.
1318
1319 template<int size>
1320 typename Output_data_plt_x86_64<size>::Reloc_section*
1321 Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout)
1322 {
1323   if (this->tlsdesc_rel_ == NULL)
1324     {
1325       this->tlsdesc_rel_ = new Reloc_section(false);
1326       layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1327                                       elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
1328                                       ORDER_DYNAMIC_PLT_RELOCS, false);
1329       gold_assert(this->tlsdesc_rel_->output_section()
1330                   == this->rel_->output_section());
1331     }
1332   return this->tlsdesc_rel_;
1333 }
1334
1335 // Return where the IRELATIVE relocations should go in the PLT.  These
1336 // follow the JUMP_SLOT and the TLSDESC relocations.
1337
1338 template<int size>
1339 typename Output_data_plt_x86_64<size>::Reloc_section*
1340 Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab,
1341                                              Layout* layout)
1342 {
1343   if (this->irelative_rel_ == NULL)
1344     {
1345       // Make sure we have a place for the TLSDESC relocations, in
1346       // case we see any later on.
1347       this->rela_tlsdesc(layout);
1348       this->irelative_rel_ = new Reloc_section(false);
1349       layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1350                                       elfcpp::SHF_ALLOC, this->irelative_rel_,
1351                                       ORDER_DYNAMIC_PLT_RELOCS, false);
1352       gold_assert(this->irelative_rel_->output_section()
1353                   == this->rel_->output_section());
1354
1355       if (parameters->doing_static_link())
1356         {
1357           // A statically linked executable will only have a .rela.plt
1358           // section to hold R_X86_64_IRELATIVE relocs for
1359           // STT_GNU_IFUNC symbols.  The library will use these
1360           // symbols to locate the IRELATIVE relocs at program startup
1361           // time.
1362           symtab->define_in_output_data("__rela_iplt_start", NULL,
1363                                         Symbol_table::PREDEFINED,
1364                                         this->irelative_rel_, 0, 0,
1365                                         elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1366                                         elfcpp::STV_HIDDEN, 0, false, true);
1367           symtab->define_in_output_data("__rela_iplt_end", NULL,
1368                                         Symbol_table::PREDEFINED,
1369                                         this->irelative_rel_, 0, 0,
1370                                         elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1371                                         elfcpp::STV_HIDDEN, 0, true, true);
1372         }
1373     }
1374   return this->irelative_rel_;
1375 }
1376
1377 // Return the PLT address to use for a global symbol.
1378
1379 template<int size>
1380 uint64_t
1381 Output_data_plt_x86_64<size>::address_for_global(const Symbol* gsym)
1382 {
1383   uint64_t offset = 0;
1384   if (gsym->type() == elfcpp::STT_GNU_IFUNC
1385       && gsym->can_use_relative_reloc(false))
1386     offset = (this->count_ + 1) * this->get_plt_entry_size();
1387   return this->address() + offset;
1388 }
1389
1390 // Return the PLT address to use for a local symbol.  These are always
1391 // IRELATIVE relocs.
1392
1393 template<int size>
1394 uint64_t
1395 Output_data_plt_x86_64<size>::address_for_local(const Relobj*, unsigned int)
1396 {
1397   return this->address() + (this->count_ + 1) * this->get_plt_entry_size();
1398 }
1399
1400 // Set the final size.
1401 template<int size>
1402 void
1403 Output_data_plt_x86_64<size>::set_final_data_size()
1404 {
1405   unsigned int count = this->count_ + this->irelative_count_;
1406   if (this->has_tlsdesc_entry())
1407     ++count;
1408   this->set_data_size((count + 1) * this->get_plt_entry_size());
1409 }
1410
1411 // The first entry in the PLT for an executable.
1412
1413 template<int size>
1414 const unsigned char
1415 Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] =
1416 {
1417   // From AMD64 ABI Draft 0.98, page 76
1418   0xff, 0x35,   // pushq contents of memory address
1419   0, 0, 0, 0,   // replaced with address of .got + 8
1420   0xff, 0x25,   // jmp indirect
1421   0, 0, 0, 0,   // replaced with address of .got + 16
1422   0x90, 0x90, 0x90, 0x90   // noop (x4)
1423 };
1424
1425 template<int size>
1426 void
1427 Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry(
1428     unsigned char* pov,
1429     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1430     typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
1431 {
1432   memcpy(pov, first_plt_entry, plt_entry_size);
1433   // We do a jmp relative to the PC at the end of this instruction.
1434   elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1435                                               (got_address + 8
1436                                                - (plt_address + 6)));
1437   elfcpp::Swap<32, false>::writeval(pov + 8,
1438                                     (got_address + 16
1439                                      - (plt_address + 12)));
1440 }
1441
1442 // Subsequent entries in the PLT for an executable.
1443
1444 template<int size>
1445 const unsigned char
1446 Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] =
1447 {
1448   // From AMD64 ABI Draft 0.98, page 76
1449   0xff, 0x25,   // jmpq indirect
1450   0, 0, 0, 0,   // replaced with address of symbol in .got
1451   0x68,         // pushq immediate
1452   0, 0, 0, 0,   // replaced with offset into relocation table
1453   0xe9,         // jmpq relative
1454   0, 0, 0, 0    // replaced with offset to start of .plt
1455 };
1456
1457 template<int size>
1458 unsigned int
1459 Output_data_plt_x86_64_standard<size>::do_fill_plt_entry(
1460     unsigned char* pov,
1461     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1462     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
1463     unsigned int got_offset,
1464     unsigned int plt_offset,
1465     unsigned int plt_index)
1466 {
1467   memcpy(pov, plt_entry, plt_entry_size);
1468   elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1469                                               (got_address + got_offset
1470                                                - (plt_address + plt_offset
1471                                                   + 6)));
1472
1473   elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index);
1474   elfcpp::Swap<32, false>::writeval(pov + 12,
1475                                     - (plt_offset + plt_entry_size));
1476
1477   return 6;
1478 }
1479
1480 // The reserved TLSDESC entry in the PLT for an executable.
1481
1482 template<int size>
1483 const unsigned char
1484 Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] =
1485 {
1486   // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
1487   // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
1488   0xff, 0x35,   // pushq x(%rip)
1489   0, 0, 0, 0,   // replaced with address of linkmap GOT entry (at PLTGOT + 8)
1490   0xff, 0x25,   // jmpq *y(%rip)
1491   0, 0, 0, 0,   // replaced with offset of reserved TLSDESC_GOT entry
1492   0x0f, 0x1f,   // nop
1493   0x40, 0
1494 };
1495
1496 template<int size>
1497 void
1498 Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry(
1499     unsigned char* pov,
1500     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1501     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
1502     typename elfcpp::Elf_types<size>::Elf_Addr got_base,
1503     unsigned int tlsdesc_got_offset,
1504     unsigned int plt_offset)
1505 {
1506   memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
1507   elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1508                                               (got_address + 8
1509                                                - (plt_address + plt_offset
1510                                                   + 6)));
1511   elfcpp::Swap_unaligned<32, false>::writeval(pov + 8,
1512                                               (got_base
1513                                                + tlsdesc_got_offset
1514                                                - (plt_address + plt_offset
1515                                                   + 12)));
1516 }
1517
1518 // The .eh_frame unwind information for the PLT.
1519
1520 template<int size>
1521 const unsigned char
1522 Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] =
1523 {
1524   1,                            // CIE version.
1525   'z',                          // Augmentation: augmentation size included.
1526   'R',                          // Augmentation: FDE encoding included.
1527   '\0',                         // End of augmentation string.
1528   1,                            // Code alignment factor.
1529   0x78,                         // Data alignment factor.
1530   16,                           // Return address column.
1531   1,                            // Augmentation size.
1532   (elfcpp::DW_EH_PE_pcrel       // FDE encoding.
1533    | elfcpp::DW_EH_PE_sdata4),
1534   elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8.
1535   elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8.
1536   elfcpp::DW_CFA_nop,           // Align to 16 bytes.
1537   elfcpp::DW_CFA_nop
1538 };
1539
1540 template<int size>
1541 const unsigned char
1542 Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
1543 {
1544   0, 0, 0, 0,                           // Replaced with offset to .plt.
1545   0, 0, 0, 0,                           // Replaced with size of .plt.
1546   0,                                    // Augmentation size.
1547   elfcpp::DW_CFA_def_cfa_offset, 16,    // DW_CFA_def_cfa_offset: 16.
1548   elfcpp::DW_CFA_advance_loc + 6,       // Advance 6 to __PLT__ + 6.
1549   elfcpp::DW_CFA_def_cfa_offset, 24,    // DW_CFA_def_cfa_offset: 24.
1550   elfcpp::DW_CFA_advance_loc + 10,      // Advance 10 to __PLT__ + 16.
1551   elfcpp::DW_CFA_def_cfa_expression,    // DW_CFA_def_cfa_expression.
1552   11,                                   // Block length.
1553   elfcpp::DW_OP_breg7, 8,               // Push %rsp + 8.
1554   elfcpp::DW_OP_breg16, 0,              // Push %rip.
1555   elfcpp::DW_OP_lit15,                  // Push 0xf.
1556   elfcpp::DW_OP_and,                    // & (%rip & 0xf).
1557   elfcpp::DW_OP_lit11,                  // Push 0xb.
1558   elfcpp::DW_OP_ge,                     // >= ((%rip & 0xf) >= 0xb)
1559   elfcpp::DW_OP_lit3,                   // Push 3.
1560   elfcpp::DW_OP_shl,                    // << (((%rip & 0xf) >= 0xb) << 3)
1561   elfcpp::DW_OP_plus,                   // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8
1562   elfcpp::DW_CFA_nop,                   // Align to 32 bytes.
1563   elfcpp::DW_CFA_nop,
1564   elfcpp::DW_CFA_nop,
1565   elfcpp::DW_CFA_nop
1566 };
1567
1568 // Write out the PLT.  This uses the hand-coded instructions above,
1569 // and adjusts them as needed.  This is specified by the AMD64 ABI.
1570
1571 template<int size>
1572 void
1573 Output_data_plt_x86_64<size>::do_write(Output_file* of)
1574 {
1575   const off_t offset = this->offset();
1576   const section_size_type oview_size =
1577     convert_to_section_size_type(this->data_size());
1578   unsigned char* const oview = of->get_output_view(offset, oview_size);
1579
1580   const off_t got_file_offset = this->got_plt_->offset();
1581   gold_assert(parameters->incremental_update()
1582               || (got_file_offset + this->got_plt_->data_size()
1583                   == this->got_irelative_->offset()));
1584   const section_size_type got_size =
1585     convert_to_section_size_type(this->got_plt_->data_size()
1586                                  + this->got_irelative_->data_size());
1587   unsigned char* const got_view = of->get_output_view(got_file_offset,
1588                                                       got_size);
1589
1590   unsigned char* pov = oview;
1591
1592   // The base address of the .plt section.
1593   typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
1594   // The base address of the .got section.
1595   typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address();
1596   // The base address of the PLT portion of the .got section,
1597   // which is where the GOT pointer will point, and where the
1598   // three reserved GOT entries are located.
1599   typename elfcpp::Elf_types<size>::Elf_Addr got_address
1600     = this->got_plt_->address();
1601
1602   this->fill_first_plt_entry(pov, got_address, plt_address);
1603   pov += this->get_plt_entry_size();
1604
1605   unsigned char* got_pov = got_view;
1606
1607   // The first entry in the GOT is the address of the .dynamic section
1608   // aka the PT_DYNAMIC segment.  The next two entries are reserved.
1609   // We saved space for them when we created the section in
1610   // Target_x86_64::got_section.
1611   Output_section* dynamic = this->layout_->dynamic_section();
1612   uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
1613   elfcpp::Swap<64, false>::writeval(got_pov, dynamic_addr);
1614   got_pov += 8;
1615   memset(got_pov, 0, 16);
1616   got_pov += 16;
1617
1618   unsigned int plt_offset = this->get_plt_entry_size();
1619   unsigned int got_offset = 24;
1620   const unsigned int count = this->count_ + this->irelative_count_;
1621   for (unsigned int plt_index = 0;
1622        plt_index < count;
1623        ++plt_index,
1624          pov += this->get_plt_entry_size(),
1625          got_pov += 8,
1626          plt_offset += this->get_plt_entry_size(),
1627          got_offset += 8)
1628     {
1629       // Set and adjust the PLT entry itself.
1630       unsigned int lazy_offset = this->fill_plt_entry(pov,
1631                                                       got_address, plt_address,
1632                                                       got_offset, plt_offset,
1633                                                       plt_index);
1634
1635       // Set the entry in the GOT.
1636       elfcpp::Swap<64, false>::writeval(got_pov,
1637                                         plt_address + plt_offset + lazy_offset);
1638     }
1639
1640   if (this->has_tlsdesc_entry())
1641     {
1642       // Set and adjust the reserved TLSDESC PLT entry.
1643       unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
1644       this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
1645                                tlsdesc_got_offset, plt_offset);
1646       pov += this->get_plt_entry_size();
1647     }
1648
1649   gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
1650   gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
1651
1652   of->write_output_view(offset, oview_size, oview);
1653   of->write_output_view(got_file_offset, got_size, got_view);
1654 }
1655
1656 // Create the PLT section.
1657
1658 template<int size>
1659 void
1660 Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout)
1661 {
1662   if (this->plt_ == NULL)
1663     {
1664       // Create the GOT sections first.
1665       this->got_section(symtab, layout);
1666
1667       this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_,
1668                                        this->got_irelative_);
1669
1670       // Add unwind information if requested.
1671       if (parameters->options().ld_generated_unwind_info())
1672         this->plt_->add_eh_frame(layout);
1673
1674       layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1675                                       (elfcpp::SHF_ALLOC
1676                                        | elfcpp::SHF_EXECINSTR),
1677                                       this->plt_, ORDER_PLT, false);
1678
1679       // Make the sh_info field of .rela.plt point to .plt.
1680       Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
1681       rela_plt_os->set_info_section(this->plt_->output_section());
1682     }
1683 }
1684
1685 // Return the section for TLSDESC relocations.
1686
1687 template<int size>
1688 typename Target_x86_64<size>::Reloc_section*
1689 Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const
1690 {
1691   return this->plt_section()->rela_tlsdesc(layout);
1692 }
1693
1694 // Create a PLT entry for a global symbol.
1695
1696 template<int size>
1697 void
1698 Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout,
1699                                     Symbol* gsym)
1700 {
1701   if (gsym->has_plt_offset())
1702     return;
1703
1704   if (this->plt_ == NULL)
1705     this->make_plt_section(symtab, layout);
1706
1707   this->plt_->add_entry(symtab, layout, gsym);
1708 }
1709
1710 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
1711
1712 template<int size>
1713 void
1714 Target_x86_64<size>::make_local_ifunc_plt_entry(
1715     Symbol_table* symtab, Layout* layout,
1716     Sized_relobj_file<size, false>* relobj,
1717     unsigned int local_sym_index)
1718 {
1719   if (relobj->local_has_plt_offset(local_sym_index))
1720     return;
1721   if (this->plt_ == NULL)
1722     this->make_plt_section(symtab, layout);
1723   unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
1724                                                               relobj,
1725                                                               local_sym_index);
1726   relobj->set_local_plt_offset(local_sym_index, plt_offset);
1727 }
1728
1729 // Return the number of entries in the PLT.
1730
1731 template<int size>
1732 unsigned int
1733 Target_x86_64<size>::plt_entry_count() const
1734 {
1735   if (this->plt_ == NULL)
1736     return 0;
1737   return this->plt_->entry_count();
1738 }
1739
1740 // Return the offset of the first non-reserved PLT entry.
1741
1742 template<int size>
1743 unsigned int
1744 Target_x86_64<size>::first_plt_entry_offset() const
1745 {
1746   return this->plt_->first_plt_entry_offset();
1747 }
1748
1749 // Return the size of each PLT entry.
1750
1751 template<int size>
1752 unsigned int
1753 Target_x86_64<size>::plt_entry_size() const
1754 {
1755   return this->plt_->get_plt_entry_size();
1756 }
1757
1758 // Create the GOT and PLT sections for an incremental update.
1759
1760 template<int size>
1761 Output_data_got_base*
1762 Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab,
1763                                        Layout* layout,
1764                                        unsigned int got_count,
1765                                        unsigned int plt_count)
1766 {
1767   gold_assert(this->got_ == NULL);
1768
1769   this->got_ = new Output_data_got<64, false>(got_count * 8);
1770   layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1771                                   (elfcpp::SHF_ALLOC
1772                                    | elfcpp::SHF_WRITE),
1773                                   this->got_, ORDER_RELRO_LAST,
1774                                   true);
1775
1776   // Add the three reserved entries.
1777   this->got_plt_ = new Output_data_space((plt_count + 3) * 8, 8, "** GOT PLT");
1778   layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1779                                   (elfcpp::SHF_ALLOC
1780                                    | elfcpp::SHF_WRITE),
1781                                   this->got_plt_, ORDER_NON_RELRO_FIRST,
1782                                   false);
1783
1784   // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1785   this->global_offset_table_ =
1786     symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1787                                   Symbol_table::PREDEFINED,
1788                                   this->got_plt_,
1789                                   0, 0, elfcpp::STT_OBJECT,
1790                                   elfcpp::STB_LOCAL,
1791                                   elfcpp::STV_HIDDEN, 0,
1792                                   false, false);
1793
1794   // If there are any TLSDESC relocations, they get GOT entries in
1795   // .got.plt after the jump slot entries.
1796   // FIXME: Get the count for TLSDESC entries.
1797   this->got_tlsdesc_ = new Output_data_got<64, false>(0);
1798   layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1799                                   elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
1800                                   this->got_tlsdesc_,
1801                                   ORDER_NON_RELRO_FIRST, false);
1802
1803   // If there are any IRELATIVE relocations, they get GOT entries in
1804   // .got.plt after the jump slot and TLSDESC entries.
1805   this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT");
1806   layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1807                                   elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
1808                                   this->got_irelative_,
1809                                   ORDER_NON_RELRO_FIRST, false);
1810
1811   // Create the PLT section.
1812   this->plt_ = this->make_data_plt(layout, this->got_,
1813                                    this->got_plt_,
1814                                    this->got_irelative_,
1815                                    plt_count);
1816
1817   // Add unwind information if requested.
1818   if (parameters->options().ld_generated_unwind_info())
1819     this->plt_->add_eh_frame(layout);
1820
1821   layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1822                                   elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
1823                                   this->plt_, ORDER_PLT, false);
1824
1825   // Make the sh_info field of .rela.plt point to .plt.
1826   Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
1827   rela_plt_os->set_info_section(this->plt_->output_section());
1828
1829   // Create the rela_dyn section.
1830   this->rela_dyn_section(layout);
1831
1832   return this->got_;
1833 }
1834
1835 // Reserve a GOT entry for a local symbol, and regenerate any
1836 // necessary dynamic relocations.
1837
1838 template<int size>
1839 void
1840 Target_x86_64<size>::reserve_local_got_entry(
1841     unsigned int got_index,
1842     Sized_relobj<size, false>* obj,
1843     unsigned int r_sym,
1844     unsigned int got_type)
1845 {
1846   unsigned int got_offset = got_index * 8;
1847   Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
1848
1849   this->got_->reserve_local(got_index, obj, r_sym, got_type);
1850   switch (got_type)
1851     {
1852     case GOT_TYPE_STANDARD:
1853       if (parameters->options().output_is_position_independent())
1854         rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE,
1855                                      this->got_, got_offset, 0, false);
1856       break;
1857     case GOT_TYPE_TLS_OFFSET:
1858       rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64,
1859                           this->got_, got_offset, 0);
1860       break;
1861     case GOT_TYPE_TLS_PAIR:
1862       this->got_->reserve_slot(got_index + 1);
1863       rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64,
1864                           this->got_, got_offset, 0);
1865       break;
1866     case GOT_TYPE_TLS_DESC:
1867       gold_fatal(_("TLS_DESC not yet supported for incremental linking"));
1868       // this->got_->reserve_slot(got_index + 1);
1869       // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
1870       //                               this->got_, got_offset, 0);
1871       break;
1872     default:
1873       gold_unreachable();
1874     }
1875 }
1876
1877 // Reserve a GOT entry for a global symbol, and regenerate any
1878 // necessary dynamic relocations.
1879
1880 template<int size>
1881 void
1882 Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index,
1883                                               Symbol* gsym,
1884                                               unsigned int got_type)
1885 {
1886   unsigned int got_offset = got_index * 8;
1887   Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
1888
1889   this->got_->reserve_global(got_index, gsym, got_type);
1890   switch (got_type)
1891     {
1892     case GOT_TYPE_STANDARD:
1893       if (!gsym->final_value_is_known())
1894         {
1895           if (gsym->is_from_dynobj()
1896               || gsym->is_undefined()
1897               || gsym->is_preemptible()
1898               || gsym->type() == elfcpp::STT_GNU_IFUNC)
1899             rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT,
1900                                  this->got_, got_offset, 0);
1901           else
1902             rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
1903                                           this->got_, got_offset, 0, false);
1904         }
1905       break;
1906     case GOT_TYPE_TLS_OFFSET:
1907       rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64,
1908                                     this->got_, got_offset, 0, false);
1909       break;
1910     case GOT_TYPE_TLS_PAIR:
1911       this->got_->reserve_slot(got_index + 1);
1912       rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64,
1913                                     this->got_, got_offset, 0, false);
1914       rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64,
1915                                     this->got_, got_offset + 8, 0, false);
1916       break;
1917     case GOT_TYPE_TLS_DESC:
1918       this->got_->reserve_slot(got_index + 1);
1919       rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC,
1920                                     this->got_, got_offset, 0, false);
1921       break;
1922     default:
1923       gold_unreachable();
1924     }
1925 }
1926
1927 // Register an existing PLT entry for a global symbol.
1928
1929 template<int size>
1930 void
1931 Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab,
1932                                                Layout* layout,
1933                                                unsigned int plt_index,
1934                                                Symbol* gsym)
1935 {
1936   gold_assert(this->plt_ != NULL);
1937   gold_assert(!gsym->has_plt_offset());
1938
1939   this->plt_->reserve_slot(plt_index);
1940
1941   gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size());
1942
1943   unsigned int got_offset = (plt_index + 3) * 8;
1944   this->plt_->add_relocation(symtab, layout, gsym, got_offset);
1945 }
1946
1947 // Force a COPY relocation for a given symbol.
1948
1949 template<int size>
1950 void
1951 Target_x86_64<size>::emit_copy_reloc(
1952     Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset)
1953 {
1954   this->copy_relocs_.emit_copy_reloc(symtab,
1955                                      symtab->get_sized_symbol<size>(sym),
1956                                      os,
1957                                      offset,
1958                                      this->rela_dyn_section(NULL));
1959 }
1960
1961 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
1962
1963 template<int size>
1964 void
1965 Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab,
1966                                             Layout* layout)
1967 {
1968   if (this->tls_base_symbol_defined_)
1969     return;
1970
1971   Output_segment* tls_segment = layout->tls_segment();
1972   if (tls_segment != NULL)
1973     {
1974       bool is_exec = parameters->options().output_is_executable();
1975       symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
1976                                        Symbol_table::PREDEFINED,
1977                                        tls_segment, 0, 0,
1978                                        elfcpp::STT_TLS,
1979                                        elfcpp::STB_LOCAL,
1980                                        elfcpp::STV_HIDDEN, 0,
1981                                        (is_exec
1982                                         ? Symbol::SEGMENT_END
1983                                         : Symbol::SEGMENT_START),
1984                                        true);
1985     }
1986   this->tls_base_symbol_defined_ = true;
1987 }
1988
1989 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
1990
1991 template<int size>
1992 void
1993 Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab,
1994                                              Layout* layout)
1995 {
1996   if (this->plt_ == NULL)
1997     this->make_plt_section(symtab, layout);
1998
1999   if (!this->plt_->has_tlsdesc_entry())
2000     {
2001       // Allocate the TLSDESC_GOT entry.
2002       Output_data_got<64, false>* got = this->got_section(symtab, layout);
2003       unsigned int got_offset = got->add_constant(0);
2004
2005       // Allocate the TLSDESC_PLT entry.
2006       this->plt_->reserve_tlsdesc_entry(got_offset);
2007     }
2008 }
2009
2010 // Create a GOT entry for the TLS module index.
2011
2012 template<int size>
2013 unsigned int
2014 Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
2015                                          Sized_relobj_file<size, false>* object)
2016 {
2017   if (this->got_mod_index_offset_ == -1U)
2018     {
2019       gold_assert(symtab != NULL && layout != NULL && object != NULL);
2020       Reloc_section* rela_dyn = this->rela_dyn_section(layout);
2021       Output_data_got<64, false>* got = this->got_section(symtab, layout);
2022       unsigned int got_offset = got->add_constant(0);
2023       rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got,
2024                           got_offset, 0);
2025       got->add_constant(0);
2026       this->got_mod_index_offset_ = got_offset;
2027     }
2028   return this->got_mod_index_offset_;
2029 }
2030
2031 // Optimize the TLS relocation type based on what we know about the
2032 // symbol.  IS_FINAL is true if the final address of this symbol is
2033 // known at link time.
2034
2035 template<int size>
2036 tls::Tls_optimization
2037 Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type)
2038 {
2039   // If we are generating a shared library, then we can't do anything
2040   // in the linker.
2041   if (parameters->options().shared())
2042     return tls::TLSOPT_NONE;
2043
2044   switch (r_type)
2045     {
2046     case elfcpp::R_X86_64_TLSGD:
2047     case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2048     case elfcpp::R_X86_64_TLSDESC_CALL:
2049       // These are General-Dynamic which permits fully general TLS
2050       // access.  Since we know that we are generating an executable,
2051       // we can convert this to Initial-Exec.  If we also know that
2052       // this is a local symbol, we can further switch to Local-Exec.
2053       if (is_final)
2054         return tls::TLSOPT_TO_LE;
2055       return tls::TLSOPT_TO_IE;
2056
2057     case elfcpp::R_X86_64_TLSLD:
2058       // This is Local-Dynamic, which refers to a local symbol in the
2059       // dynamic TLS block.  Since we know that we generating an
2060       // executable, we can switch to Local-Exec.
2061       return tls::TLSOPT_TO_LE;
2062
2063     case elfcpp::R_X86_64_DTPOFF32:
2064     case elfcpp::R_X86_64_DTPOFF64:
2065       // Another Local-Dynamic reloc.
2066       return tls::TLSOPT_TO_LE;
2067
2068     case elfcpp::R_X86_64_GOTTPOFF:
2069       // These are Initial-Exec relocs which get the thread offset
2070       // from the GOT.  If we know that we are linking against the
2071       // local symbol, we can switch to Local-Exec, which links the
2072       // thread offset into the instruction.
2073       if (is_final)
2074         return tls::TLSOPT_TO_LE;
2075       return tls::TLSOPT_NONE;
2076
2077     case elfcpp::R_X86_64_TPOFF32:
2078       // When we already have Local-Exec, there is nothing further we
2079       // can do.
2080       return tls::TLSOPT_NONE;
2081
2082     default:
2083       gold_unreachable();
2084     }
2085 }
2086
2087 // Get the Reference_flags for a particular relocation.
2088
2089 template<int size>
2090 int
2091 Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type)
2092 {
2093   switch (r_type)
2094     {
2095     case elfcpp::R_X86_64_NONE:
2096     case elfcpp::R_X86_64_GNU_VTINHERIT:
2097     case elfcpp::R_X86_64_GNU_VTENTRY:
2098     case elfcpp::R_X86_64_GOTPC32:
2099     case elfcpp::R_X86_64_GOTPC64:
2100       // No symbol reference.
2101       return 0;
2102
2103     case elfcpp::R_X86_64_64:
2104     case elfcpp::R_X86_64_32:
2105     case elfcpp::R_X86_64_32S:
2106     case elfcpp::R_X86_64_16:
2107     case elfcpp::R_X86_64_8:
2108       return Symbol::ABSOLUTE_REF;
2109
2110     case elfcpp::R_X86_64_PC64:
2111     case elfcpp::R_X86_64_PC32:
2112     case elfcpp::R_X86_64_PC16:
2113     case elfcpp::R_X86_64_PC8:
2114     case elfcpp::R_X86_64_GOTOFF64:
2115       return Symbol::RELATIVE_REF;
2116
2117     case elfcpp::R_X86_64_PLT32:
2118     case elfcpp::R_X86_64_PLTOFF64:
2119       return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
2120
2121     case elfcpp::R_X86_64_GOT64:
2122     case elfcpp::R_X86_64_GOT32:
2123     case elfcpp::R_X86_64_GOTPCREL64:
2124     case elfcpp::R_X86_64_GOTPCREL:
2125     case elfcpp::R_X86_64_GOTPLT64:
2126       // Absolute in GOT.
2127       return Symbol::ABSOLUTE_REF;
2128
2129     case elfcpp::R_X86_64_TLSGD:            // Global-dynamic
2130     case elfcpp::R_X86_64_GOTPC32_TLSDESC:  // Global-dynamic (from ~oliva url)
2131     case elfcpp::R_X86_64_TLSDESC_CALL:
2132     case elfcpp::R_X86_64_TLSLD:            // Local-dynamic
2133     case elfcpp::R_X86_64_DTPOFF32:
2134     case elfcpp::R_X86_64_DTPOFF64:
2135     case elfcpp::R_X86_64_GOTTPOFF:         // Initial-exec
2136     case elfcpp::R_X86_64_TPOFF32:          // Local-exec
2137       return Symbol::TLS_REF;
2138
2139     case elfcpp::R_X86_64_COPY:
2140     case elfcpp::R_X86_64_GLOB_DAT:
2141     case elfcpp::R_X86_64_JUMP_SLOT:
2142     case elfcpp::R_X86_64_RELATIVE:
2143     case elfcpp::R_X86_64_IRELATIVE:
2144     case elfcpp::R_X86_64_TPOFF64:
2145     case elfcpp::R_X86_64_DTPMOD64:
2146     case elfcpp::R_X86_64_TLSDESC:
2147     case elfcpp::R_X86_64_SIZE32:
2148     case elfcpp::R_X86_64_SIZE64:
2149     default:
2150       // Not expected.  We will give an error later.
2151       return 0;
2152     }
2153 }
2154
2155 // Report an unsupported relocation against a local symbol.
2156
2157 template<int size>
2158 void
2159 Target_x86_64<size>::Scan::unsupported_reloc_local(
2160      Sized_relobj_file<size, false>* object,
2161      unsigned int r_type)
2162 {
2163   gold_error(_("%s: unsupported reloc %u against local symbol"),
2164              object->name().c_str(), r_type);
2165 }
2166
2167 // We are about to emit a dynamic relocation of type R_TYPE.  If the
2168 // dynamic linker does not support it, issue an error.  The GNU linker
2169 // only issues a non-PIC error for an allocated read-only section.
2170 // Here we know the section is allocated, but we don't know that it is
2171 // read-only.  But we check for all the relocation types which the
2172 // glibc dynamic linker supports, so it seems appropriate to issue an
2173 // error even if the section is not read-only.  If GSYM is not NULL,
2174 // it is the symbol the relocation is against; if it is NULL, the
2175 // relocation is against a local symbol.
2176
2177 template<int size>
2178 void
2179 Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type,
2180                                          Symbol* gsym)
2181 {
2182   switch (r_type)
2183     {
2184       // These are the relocation types supported by glibc for x86_64
2185       // which should always work.
2186     case elfcpp::R_X86_64_RELATIVE:
2187     case elfcpp::R_X86_64_IRELATIVE:
2188     case elfcpp::R_X86_64_GLOB_DAT:
2189     case elfcpp::R_X86_64_JUMP_SLOT:
2190     case elfcpp::R_X86_64_DTPMOD64:
2191     case elfcpp::R_X86_64_DTPOFF64:
2192     case elfcpp::R_X86_64_TPOFF64:
2193     case elfcpp::R_X86_64_64:
2194     case elfcpp::R_X86_64_COPY:
2195       return;
2196
2197       // glibc supports these reloc types, but they can overflow.
2198     case elfcpp::R_X86_64_PC32:
2199       // A PC relative reference is OK against a local symbol or if
2200       // the symbol is defined locally.
2201       if (gsym == NULL
2202           || (!gsym->is_from_dynobj()
2203               && !gsym->is_undefined()
2204               && !gsym->is_preemptible()))
2205         return;
2206       /* Fall through.  */
2207     case elfcpp::R_X86_64_32:
2208       // R_X86_64_32 is OK for x32.
2209       if (size == 32 && r_type == elfcpp::R_X86_64_32)
2210         return;
2211       if (this->issued_non_pic_error_)
2212         return;
2213       gold_assert(parameters->options().output_is_position_independent());
2214       if (gsym == NULL)
2215         object->error(_("requires dynamic R_X86_64_32 reloc which may "
2216                         "overflow at runtime; recompile with -fPIC"));
2217       else
2218         object->error(_("requires dynamic %s reloc against '%s' which may "
2219                         "overflow at runtime; recompile with -fPIC"),
2220                       (r_type == elfcpp::R_X86_64_32
2221                        ? "R_X86_64_32"
2222                        : "R_X86_64_PC32"),
2223                       gsym->name());
2224       this->issued_non_pic_error_ = true;
2225       return;
2226
2227     default:
2228       // This prevents us from issuing more than one error per reloc
2229       // section.  But we can still wind up issuing more than one
2230       // error per object file.
2231       if (this->issued_non_pic_error_)
2232         return;
2233       gold_assert(parameters->options().output_is_position_independent());
2234       object->error(_("requires unsupported dynamic reloc %u; "
2235                       "recompile with -fPIC"),
2236                     r_type);
2237       this->issued_non_pic_error_ = true;
2238       return;
2239
2240     case elfcpp::R_X86_64_NONE:
2241       gold_unreachable();
2242     }
2243 }
2244
2245 // Return whether we need to make a PLT entry for a relocation of the
2246 // given type against a STT_GNU_IFUNC symbol.
2247
2248 template<int size>
2249 bool
2250 Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc(
2251      Sized_relobj_file<size, false>* object,
2252      unsigned int r_type)
2253 {
2254   int flags = Scan::get_reference_flags(r_type);
2255   if (flags & Symbol::TLS_REF)
2256     gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
2257                object->name().c_str(), r_type);
2258   return flags != 0;
2259 }
2260
2261 // Scan a relocation for a local symbol.
2262
2263 template<int size>
2264 inline void
2265 Target_x86_64<size>::Scan::local(Symbol_table* symtab,
2266                                  Layout* layout,
2267                                  Target_x86_64<size>* target,
2268                                  Sized_relobj_file<size, false>* object,
2269                                  unsigned int data_shndx,
2270                                  Output_section* output_section,
2271                                  const elfcpp::Rela<size, false>& reloc,
2272                                  unsigned int r_type,
2273                                  const elfcpp::Sym<size, false>& lsym)
2274 {
2275   // A local STT_GNU_IFUNC symbol may require a PLT entry.
2276   bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
2277   if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
2278     {
2279       unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2280       target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
2281     }
2282
2283   switch (r_type)
2284     {
2285     case elfcpp::R_X86_64_NONE:
2286     case elfcpp::R_X86_64_GNU_VTINHERIT:
2287     case elfcpp::R_X86_64_GNU_VTENTRY:
2288       break;
2289
2290     case elfcpp::R_X86_64_64:
2291       // If building a shared library (or a position-independent
2292       // executable), we need to create a dynamic relocation for this
2293       // location.  The relocation applied at link time will apply the
2294       // link-time value, so we flag the location with an
2295       // R_X86_64_RELATIVE relocation so the dynamic loader can
2296       // relocate it easily.
2297       if (parameters->options().output_is_position_independent())
2298         {
2299           unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2300           Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2301           rela_dyn->add_local_relative(object, r_sym,
2302                                        (size == 32
2303                                         ? elfcpp::R_X86_64_RELATIVE64
2304                                         : elfcpp::R_X86_64_RELATIVE),
2305                                        output_section, data_shndx,
2306                                        reloc.get_r_offset(),
2307                                        reloc.get_r_addend(), is_ifunc);
2308         }
2309       break;
2310
2311     case elfcpp::R_X86_64_32:
2312     case elfcpp::R_X86_64_32S:
2313     case elfcpp::R_X86_64_16:
2314     case elfcpp::R_X86_64_8:
2315       // If building a shared library (or a position-independent
2316       // executable), we need to create a dynamic relocation for this
2317       // location.  We can't use an R_X86_64_RELATIVE relocation
2318       // because that is always a 64-bit relocation.
2319       if (parameters->options().output_is_position_independent())
2320         {
2321           // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32.
2322           if (size == 32 && r_type == elfcpp::R_X86_64_32)
2323             {
2324               unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2325               Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2326               rela_dyn->add_local_relative(object, r_sym,
2327                                            elfcpp::R_X86_64_RELATIVE,
2328                                            output_section, data_shndx,
2329                                            reloc.get_r_offset(),
2330                                            reloc.get_r_addend(), is_ifunc);
2331               break;
2332             }
2333
2334           this->check_non_pic(object, r_type, NULL);
2335
2336           Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2337           unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2338           if (lsym.get_st_type() != elfcpp::STT_SECTION)
2339             rela_dyn->add_local(object, r_sym, r_type, output_section,
2340                                 data_shndx, reloc.get_r_offset(),
2341                                 reloc.get_r_addend());
2342           else
2343             {
2344               gold_assert(lsym.get_st_value() == 0);
2345               unsigned int shndx = lsym.get_st_shndx();
2346               bool is_ordinary;
2347               shndx = object->adjust_sym_shndx(r_sym, shndx,
2348                                                &is_ordinary);
2349               if (!is_ordinary)
2350                 object->error(_("section symbol %u has bad shndx %u"),
2351                               r_sym, shndx);
2352               else
2353                 rela_dyn->add_local_section(object, shndx,
2354                                             r_type, output_section,
2355                                             data_shndx, reloc.get_r_offset(),
2356                                             reloc.get_r_addend());
2357             }
2358         }
2359       break;
2360
2361     case elfcpp::R_X86_64_PC64:
2362     case elfcpp::R_X86_64_PC32:
2363     case elfcpp::R_X86_64_PC16:
2364     case elfcpp::R_X86_64_PC8:
2365       break;
2366
2367     case elfcpp::R_X86_64_PLT32:
2368       // Since we know this is a local symbol, we can handle this as a
2369       // PC32 reloc.
2370       break;
2371
2372     case elfcpp::R_X86_64_GOTPC32:
2373     case elfcpp::R_X86_64_GOTOFF64:
2374     case elfcpp::R_X86_64_GOTPC64:
2375     case elfcpp::R_X86_64_PLTOFF64:
2376       // We need a GOT section.
2377       target->got_section(symtab, layout);
2378       // For PLTOFF64, we'd normally want a PLT section, but since we
2379       // know this is a local symbol, no PLT is needed.
2380       break;
2381
2382     case elfcpp::R_X86_64_GOT64:
2383     case elfcpp::R_X86_64_GOT32:
2384     case elfcpp::R_X86_64_GOTPCREL64:
2385     case elfcpp::R_X86_64_GOTPCREL:
2386     case elfcpp::R_X86_64_GOTPLT64:
2387       {
2388         // The symbol requires a GOT entry.
2389         Output_data_got<64, false>* got = target->got_section(symtab, layout);
2390         unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2391
2392         // For a STT_GNU_IFUNC symbol we want the PLT offset.  That
2393         // lets function pointers compare correctly with shared
2394         // libraries.  Otherwise we would need an IRELATIVE reloc.
2395         bool is_new;
2396         if (is_ifunc)
2397           is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
2398         else
2399           is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
2400         if (is_new)
2401           {
2402             // If we are generating a shared object, we need to add a
2403             // dynamic relocation for this symbol's GOT entry.
2404             if (parameters->options().output_is_position_independent())
2405               {
2406                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2407                 // R_X86_64_RELATIVE assumes a 64-bit relocation.
2408                 if (r_type != elfcpp::R_X86_64_GOT32)
2409                   {
2410                     unsigned int got_offset =
2411                       object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
2412                     rela_dyn->add_local_relative(object, r_sym,
2413                                                  elfcpp::R_X86_64_RELATIVE,
2414                                                  got, got_offset, 0, is_ifunc);
2415                   }
2416                 else
2417                   {
2418                     this->check_non_pic(object, r_type, NULL);
2419
2420                     gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
2421                     rela_dyn->add_local(
2422                         object, r_sym, r_type, got,
2423                         object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
2424                   }
2425               }
2426           }
2427         // For GOTPLT64, we'd normally want a PLT section, but since
2428         // we know this is a local symbol, no PLT is needed.
2429       }
2430       break;
2431
2432     case elfcpp::R_X86_64_COPY:
2433     case elfcpp::R_X86_64_GLOB_DAT:
2434     case elfcpp::R_X86_64_JUMP_SLOT:
2435     case elfcpp::R_X86_64_RELATIVE:
2436     case elfcpp::R_X86_64_IRELATIVE:
2437       // These are outstanding tls relocs, which are unexpected when linking
2438     case elfcpp::R_X86_64_TPOFF64:
2439     case elfcpp::R_X86_64_DTPMOD64:
2440     case elfcpp::R_X86_64_TLSDESC:
2441       gold_error(_("%s: unexpected reloc %u in object file"),
2442                  object->name().c_str(), r_type);
2443       break;
2444
2445       // These are initial tls relocs, which are expected when linking
2446     case elfcpp::R_X86_64_TLSGD:            // Global-dynamic
2447     case elfcpp::R_X86_64_GOTPC32_TLSDESC:  // Global-dynamic (from ~oliva url)
2448     case elfcpp::R_X86_64_TLSDESC_CALL:
2449     case elfcpp::R_X86_64_TLSLD:            // Local-dynamic
2450     case elfcpp::R_X86_64_DTPOFF32:
2451     case elfcpp::R_X86_64_DTPOFF64:
2452     case elfcpp::R_X86_64_GOTTPOFF:         // Initial-exec
2453     case elfcpp::R_X86_64_TPOFF32:          // Local-exec
2454       {
2455         bool output_is_shared = parameters->options().shared();
2456         const tls::Tls_optimization optimized_type
2457             = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared,
2458                                                       r_type);
2459         switch (r_type)
2460           {
2461           case elfcpp::R_X86_64_TLSGD:       // General-dynamic
2462             if (optimized_type == tls::TLSOPT_NONE)
2463               {
2464                 // Create a pair of GOT entries for the module index and
2465                 // dtv-relative offset.
2466                 Output_data_got<64, false>* got
2467                     = target->got_section(symtab, layout);
2468                 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2469                 unsigned int shndx = lsym.get_st_shndx();
2470                 bool is_ordinary;
2471                 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
2472                 if (!is_ordinary)
2473                   object->error(_("local symbol %u has bad shndx %u"),
2474                               r_sym, shndx);
2475                 else
2476                   got->add_local_pair_with_rel(object, r_sym,
2477                                                shndx,
2478                                                GOT_TYPE_TLS_PAIR,
2479                                                target->rela_dyn_section(layout),
2480                                                elfcpp::R_X86_64_DTPMOD64, 0);
2481               }
2482             else if (optimized_type != tls::TLSOPT_TO_LE)
2483               unsupported_reloc_local(object, r_type);
2484             break;
2485
2486           case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2487             target->define_tls_base_symbol(symtab, layout);
2488             if (optimized_type == tls::TLSOPT_NONE)
2489               {
2490                 // Create reserved PLT and GOT entries for the resolver.
2491                 target->reserve_tlsdesc_entries(symtab, layout);
2492
2493                 // Generate a double GOT entry with an
2494                 // R_X86_64_TLSDESC reloc.  The R_X86_64_TLSDESC reloc
2495                 // is resolved lazily, so the GOT entry needs to be in
2496                 // an area in .got.plt, not .got.  Call got_section to
2497                 // make sure the section has been created.
2498                 target->got_section(symtab, layout);
2499                 Output_data_got<64, false>* got = target->got_tlsdesc_section();
2500                 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2501                 if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
2502                   {
2503                     unsigned int got_offset = got->add_constant(0);
2504                     got->add_constant(0);
2505                     object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
2506                                                  got_offset);
2507                     Reloc_section* rt = target->rela_tlsdesc_section(layout);
2508                     // We store the arguments we need in a vector, and
2509                     // use the index into the vector as the parameter
2510                     // to pass to the target specific routines.
2511                     uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
2512                     void* arg = reinterpret_cast<void*>(intarg);
2513                     rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
2514                                             got, got_offset, 0);
2515                   }
2516               }
2517             else if (optimized_type != tls::TLSOPT_TO_LE)
2518               unsupported_reloc_local(object, r_type);
2519             break;
2520
2521           case elfcpp::R_X86_64_TLSDESC_CALL:
2522             break;
2523
2524           case elfcpp::R_X86_64_TLSLD:       // Local-dynamic
2525             if (optimized_type == tls::TLSOPT_NONE)
2526               {
2527                 // Create a GOT entry for the module index.
2528                 target->got_mod_index_entry(symtab, layout, object);
2529               }
2530             else if (optimized_type != tls::TLSOPT_TO_LE)
2531               unsupported_reloc_local(object, r_type);
2532             break;
2533
2534           case elfcpp::R_X86_64_DTPOFF32:
2535           case elfcpp::R_X86_64_DTPOFF64:
2536             break;
2537
2538           case elfcpp::R_X86_64_GOTTPOFF:    // Initial-exec
2539             layout->set_has_static_tls();
2540             if (optimized_type == tls::TLSOPT_NONE)
2541               {
2542                 // Create a GOT entry for the tp-relative offset.
2543                 Output_data_got<64, false>* got
2544                     = target->got_section(symtab, layout);
2545                 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2546                 got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
2547                                         target->rela_dyn_section(layout),
2548                                         elfcpp::R_X86_64_TPOFF64);
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_TPOFF32:     // Local-exec
2555             layout->set_has_static_tls();
2556             if (output_is_shared)
2557               unsupported_reloc_local(object, r_type);
2558             break;
2559
2560           default:
2561             gold_unreachable();
2562           }
2563       }
2564       break;
2565
2566     case elfcpp::R_X86_64_SIZE32:
2567     case elfcpp::R_X86_64_SIZE64:
2568     default:
2569       gold_error(_("%s: unsupported reloc %u against local symbol"),
2570                  object->name().c_str(), r_type);
2571       break;
2572     }
2573 }
2574
2575
2576 // Report an unsupported relocation against a global symbol.
2577
2578 template<int size>
2579 void
2580 Target_x86_64<size>::Scan::unsupported_reloc_global(
2581     Sized_relobj_file<size, false>* object,
2582     unsigned int r_type,
2583     Symbol* gsym)
2584 {
2585   gold_error(_("%s: unsupported reloc %u against global symbol %s"),
2586              object->name().c_str(), r_type, gsym->demangled_name().c_str());
2587 }
2588
2589 // Returns true if this relocation type could be that of a function pointer.
2590 template<int size>
2591 inline bool
2592 Target_x86_64<size>::Scan::possible_function_pointer_reloc(unsigned int r_type)
2593 {
2594   switch (r_type)
2595     {
2596     case elfcpp::R_X86_64_64:
2597     case elfcpp::R_X86_64_32:
2598     case elfcpp::R_X86_64_32S:
2599     case elfcpp::R_X86_64_16:
2600     case elfcpp::R_X86_64_8:
2601     case elfcpp::R_X86_64_GOT64:
2602     case elfcpp::R_X86_64_GOT32:
2603     case elfcpp::R_X86_64_GOTPCREL64:
2604     case elfcpp::R_X86_64_GOTPCREL:
2605     case elfcpp::R_X86_64_GOTPLT64:
2606       {
2607         return true;
2608       }
2609     }
2610   return false;
2611 }
2612
2613 // For safe ICF, scan a relocation for a local symbol to check if it
2614 // corresponds to a function pointer being taken.  In that case mark
2615 // the function whose pointer was taken as not foldable.
2616
2617 template<int size>
2618 inline bool
2619 Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer(
2620   Symbol_table* ,
2621   Layout* ,
2622   Target_x86_64<size>* ,
2623   Sized_relobj_file<size, false>* ,
2624   unsigned int ,
2625   Output_section* ,
2626   const elfcpp::Rela<size, false>& ,
2627   unsigned int r_type,
2628   const elfcpp::Sym<size, false>&)
2629 {
2630   // When building a shared library, do not fold any local symbols as it is
2631   // not possible to distinguish pointer taken versus a call by looking at
2632   // the relocation types.
2633   return (parameters->options().shared()
2634           || possible_function_pointer_reloc(r_type));
2635 }
2636
2637 // For safe ICF, scan a relocation for a global symbol to check if it
2638 // corresponds to a function pointer being taken.  In that case mark
2639 // the function whose pointer was taken as not foldable.
2640
2641 template<int size>
2642 inline bool
2643 Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer(
2644   Symbol_table*,
2645   Layout* ,
2646   Target_x86_64<size>* ,
2647   Sized_relobj_file<size, false>* ,
2648   unsigned int ,
2649   Output_section* ,
2650   const elfcpp::Rela<size, false>& ,
2651   unsigned int r_type,
2652   Symbol* gsym)
2653 {
2654   // When building a shared library, do not fold symbols whose visibility
2655   // is hidden, internal or protected.
2656   return ((parameters->options().shared()
2657            && (gsym->visibility() == elfcpp::STV_INTERNAL
2658                || gsym->visibility() == elfcpp::STV_PROTECTED
2659                || gsym->visibility() == elfcpp::STV_HIDDEN))
2660           || possible_function_pointer_reloc(r_type));
2661 }
2662
2663 // Scan a relocation for a global symbol.
2664
2665 template<int size>
2666 inline void
2667 Target_x86_64<size>::Scan::global(Symbol_table* symtab,
2668                             Layout* layout,
2669                             Target_x86_64<size>* target,
2670                             Sized_relobj_file<size, false>* object,
2671                             unsigned int data_shndx,
2672                             Output_section* output_section,
2673                             const elfcpp::Rela<size, false>& reloc,
2674                             unsigned int r_type,
2675                             Symbol* gsym)
2676 {
2677   // A STT_GNU_IFUNC symbol may require a PLT entry.
2678   if (gsym->type() == elfcpp::STT_GNU_IFUNC
2679       && this->reloc_needs_plt_for_ifunc(object, r_type))
2680     target->make_plt_entry(symtab, layout, gsym);
2681
2682   switch (r_type)
2683     {
2684     case elfcpp::R_X86_64_NONE:
2685     case elfcpp::R_X86_64_GNU_VTINHERIT:
2686     case elfcpp::R_X86_64_GNU_VTENTRY:
2687       break;
2688
2689     case elfcpp::R_X86_64_64:
2690     case elfcpp::R_X86_64_32:
2691     case elfcpp::R_X86_64_32S:
2692     case elfcpp::R_X86_64_16:
2693     case elfcpp::R_X86_64_8:
2694       {
2695         // Make a PLT entry if necessary.
2696         if (gsym->needs_plt_entry())
2697           {
2698             target->make_plt_entry(symtab, layout, gsym);
2699             // Since this is not a PC-relative relocation, we may be
2700             // taking the address of a function. In that case we need to
2701             // set the entry in the dynamic symbol table to the address of
2702             // the PLT entry.
2703             if (gsym->is_from_dynobj() && !parameters->options().shared())
2704               gsym->set_needs_dynsym_value();
2705           }
2706         // Make a dynamic relocation if necessary.
2707         if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
2708           {
2709             if (gsym->may_need_copy_reloc())
2710               {
2711                 target->copy_reloc(symtab, layout, object,
2712                                    data_shndx, output_section, gsym, reloc);
2713               }
2714             else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
2715                       || (size == 32 && r_type == elfcpp::R_X86_64_32))
2716                      && gsym->type() == elfcpp::STT_GNU_IFUNC
2717                      && gsym->can_use_relative_reloc(false)
2718                      && !gsym->is_from_dynobj()
2719                      && !gsym->is_undefined()
2720                      && !gsym->is_preemptible())
2721               {
2722                 // Use an IRELATIVE reloc for a locally defined
2723                 // STT_GNU_IFUNC symbol.  This makes a function
2724                 // address in a PIE executable match the address in a
2725                 // shared library that it links against.
2726                 Reloc_section* rela_dyn =
2727                   target->rela_irelative_section(layout);
2728                 unsigned int r_type = elfcpp::R_X86_64_IRELATIVE;
2729                 rela_dyn->add_symbolless_global_addend(gsym, r_type,
2730                                                        output_section, object,
2731                                                        data_shndx,
2732                                                        reloc.get_r_offset(),
2733                                                        reloc.get_r_addend());
2734               }
2735             else if (r_type == elfcpp::R_X86_64_64
2736                      && gsym->can_use_relative_reloc(false))
2737               {
2738                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2739                 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
2740                                               output_section, object,
2741                                               data_shndx,
2742                                               reloc.get_r_offset(),
2743                                               reloc.get_r_addend(), false);
2744               }
2745             else
2746               {
2747                 this->check_non_pic(object, r_type, gsym);
2748                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2749                 rela_dyn->add_global(gsym, r_type, output_section, object,
2750                                      data_shndx, reloc.get_r_offset(),
2751                                      reloc.get_r_addend());
2752               }
2753           }
2754       }
2755       break;
2756
2757     case elfcpp::R_X86_64_PC64:
2758     case elfcpp::R_X86_64_PC32:
2759     case elfcpp::R_X86_64_PC16:
2760     case elfcpp::R_X86_64_PC8:
2761       {
2762         // Make a PLT entry if necessary.
2763         if (gsym->needs_plt_entry())
2764           target->make_plt_entry(symtab, layout, gsym);
2765         // Make a dynamic relocation if necessary.
2766         if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
2767           {
2768             if (gsym->may_need_copy_reloc())
2769               {
2770                 target->copy_reloc(symtab, layout, object,
2771                                    data_shndx, output_section, gsym, reloc);
2772               }
2773             else
2774               {
2775                 this->check_non_pic(object, r_type, gsym);
2776                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2777                 rela_dyn->add_global(gsym, r_type, output_section, object,
2778                                      data_shndx, reloc.get_r_offset(),
2779                                      reloc.get_r_addend());
2780               }
2781           }
2782       }
2783       break;
2784
2785     case elfcpp::R_X86_64_GOT64:
2786     case elfcpp::R_X86_64_GOT32:
2787     case elfcpp::R_X86_64_GOTPCREL64:
2788     case elfcpp::R_X86_64_GOTPCREL:
2789     case elfcpp::R_X86_64_GOTPLT64:
2790       {
2791         // The symbol requires a GOT entry.
2792         Output_data_got<64, false>* got = target->got_section(symtab, layout);
2793         if (gsym->final_value_is_known())
2794           {
2795             // For a STT_GNU_IFUNC symbol we want the PLT address.
2796             if (gsym->type() == elfcpp::STT_GNU_IFUNC)
2797               got->add_global_plt(gsym, GOT_TYPE_STANDARD);
2798             else
2799               got->add_global(gsym, GOT_TYPE_STANDARD);
2800           }
2801         else
2802           {
2803             // If this symbol is not fully resolved, we need to add a
2804             // dynamic relocation for it.
2805             Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2806
2807             // Use a GLOB_DAT rather than a RELATIVE reloc if:
2808             //
2809             // 1) The symbol may be defined in some other module.
2810             //
2811             // 2) We are building a shared library and this is a
2812             // protected symbol; using GLOB_DAT means that the dynamic
2813             // linker can use the address of the PLT in the main
2814             // executable when appropriate so that function address
2815             // comparisons work.
2816             //
2817             // 3) This is a STT_GNU_IFUNC symbol in position dependent
2818             // code, again so that function address comparisons work.
2819             if (gsym->is_from_dynobj()
2820                 || gsym->is_undefined()
2821                 || gsym->is_preemptible()
2822                 || (gsym->visibility() == elfcpp::STV_PROTECTED
2823                     && parameters->options().shared())
2824                 || (gsym->type() == elfcpp::STT_GNU_IFUNC
2825                     && parameters->options().output_is_position_independent()))
2826               got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
2827                                        elfcpp::R_X86_64_GLOB_DAT);
2828             else
2829               {
2830                 // For a STT_GNU_IFUNC symbol we want to write the PLT
2831                 // offset into the GOT, so that function pointer
2832                 // comparisons work correctly.
2833                 bool is_new;
2834                 if (gsym->type() != elfcpp::STT_GNU_IFUNC)
2835                   is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
2836                 else
2837                   {
2838                     is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
2839                     // Tell the dynamic linker to use the PLT address
2840                     // when resolving relocations.
2841                     if (gsym->is_from_dynobj()
2842                         && !parameters->options().shared())
2843                       gsym->set_needs_dynsym_value();
2844                   }
2845                 if (is_new)
2846                   {
2847                     unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD);
2848                     rela_dyn->add_global_relative(gsym,
2849                                                   elfcpp::R_X86_64_RELATIVE,
2850                                                   got, got_off, 0, false);
2851                   }
2852               }
2853           }
2854         // For GOTPLT64, we also need a PLT entry (but only if the
2855         // symbol is not fully resolved).
2856         if (r_type == elfcpp::R_X86_64_GOTPLT64
2857             && !gsym->final_value_is_known())
2858           target->make_plt_entry(symtab, layout, gsym);
2859       }
2860       break;
2861
2862     case elfcpp::R_X86_64_PLT32:
2863       // If the symbol is fully resolved, this is just a PC32 reloc.
2864       // Otherwise we need a PLT entry.
2865       if (gsym->final_value_is_known())
2866         break;
2867       // If building a shared library, we can also skip the PLT entry
2868       // if the symbol is defined in the output file and is protected
2869       // or hidden.
2870       if (gsym->is_defined()
2871           && !gsym->is_from_dynobj()
2872           && !gsym->is_preemptible())
2873         break;
2874       target->make_plt_entry(symtab, layout, gsym);
2875       break;
2876
2877     case elfcpp::R_X86_64_GOTPC32:
2878     case elfcpp::R_X86_64_GOTOFF64:
2879     case elfcpp::R_X86_64_GOTPC64:
2880     case elfcpp::R_X86_64_PLTOFF64:
2881       // We need a GOT section.
2882       target->got_section(symtab, layout);
2883       // For PLTOFF64, we also need a PLT entry (but only if the
2884       // symbol is not fully resolved).
2885       if (r_type == elfcpp::R_X86_64_PLTOFF64
2886           && !gsym->final_value_is_known())
2887         target->make_plt_entry(symtab, layout, gsym);
2888       break;
2889
2890     case elfcpp::R_X86_64_COPY:
2891     case elfcpp::R_X86_64_GLOB_DAT:
2892     case elfcpp::R_X86_64_JUMP_SLOT:
2893     case elfcpp::R_X86_64_RELATIVE:
2894     case elfcpp::R_X86_64_IRELATIVE:
2895       // These are outstanding tls relocs, which are unexpected when linking
2896     case elfcpp::R_X86_64_TPOFF64:
2897     case elfcpp::R_X86_64_DTPMOD64:
2898     case elfcpp::R_X86_64_TLSDESC:
2899       gold_error(_("%s: unexpected reloc %u in object file"),
2900                  object->name().c_str(), r_type);
2901       break;
2902
2903       // These are initial tls relocs, which are expected for global()
2904     case elfcpp::R_X86_64_TLSGD:            // Global-dynamic
2905     case elfcpp::R_X86_64_GOTPC32_TLSDESC:  // Global-dynamic (from ~oliva url)
2906     case elfcpp::R_X86_64_TLSDESC_CALL:
2907     case elfcpp::R_X86_64_TLSLD:            // Local-dynamic
2908     case elfcpp::R_X86_64_DTPOFF32:
2909     case elfcpp::R_X86_64_DTPOFF64:
2910     case elfcpp::R_X86_64_GOTTPOFF:         // Initial-exec
2911     case elfcpp::R_X86_64_TPOFF32:          // Local-exec
2912       {
2913         const bool is_final = gsym->final_value_is_known();
2914         const tls::Tls_optimization optimized_type
2915             = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
2916         switch (r_type)
2917           {
2918           case elfcpp::R_X86_64_TLSGD:       // General-dynamic
2919             if (optimized_type == tls::TLSOPT_NONE)
2920               {
2921                 // Create a pair of GOT entries for the module index and
2922                 // dtv-relative offset.
2923                 Output_data_got<64, false>* got
2924                     = target->got_section(symtab, layout);
2925                 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
2926                                               target->rela_dyn_section(layout),
2927                                               elfcpp::R_X86_64_DTPMOD64,
2928                                               elfcpp::R_X86_64_DTPOFF64);
2929               }
2930             else if (optimized_type == tls::TLSOPT_TO_IE)
2931               {
2932                 // Create a GOT entry for the tp-relative offset.
2933                 Output_data_got<64, false>* got
2934                     = target->got_section(symtab, layout);
2935                 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
2936                                          target->rela_dyn_section(layout),
2937                                          elfcpp::R_X86_64_TPOFF64);
2938               }
2939             else if (optimized_type != tls::TLSOPT_TO_LE)
2940               unsupported_reloc_global(object, r_type, gsym);
2941             break;
2942
2943           case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2944             target->define_tls_base_symbol(symtab, layout);
2945             if (optimized_type == tls::TLSOPT_NONE)
2946               {
2947                 // Create reserved PLT and GOT entries for the resolver.
2948                 target->reserve_tlsdesc_entries(symtab, layout);
2949
2950                 // Create a double GOT entry with an R_X86_64_TLSDESC
2951                 // reloc.  The R_X86_64_TLSDESC reloc is resolved
2952                 // lazily, so the GOT entry needs to be in an area in
2953                 // .got.plt, not .got.  Call got_section to make sure
2954                 // the section has been created.
2955                 target->got_section(symtab, layout);
2956                 Output_data_got<64, false>* got = target->got_tlsdesc_section();
2957                 Reloc_section* rt = target->rela_tlsdesc_section(layout);
2958                 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
2959                                               elfcpp::R_X86_64_TLSDESC, 0);
2960               }
2961             else if (optimized_type == tls::TLSOPT_TO_IE)
2962               {
2963                 // Create a GOT entry for the tp-relative offset.
2964                 Output_data_got<64, false>* got
2965                     = target->got_section(symtab, layout);
2966                 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
2967                                          target->rela_dyn_section(layout),
2968                                          elfcpp::R_X86_64_TPOFF64);
2969               }
2970             else if (optimized_type != tls::TLSOPT_TO_LE)
2971               unsupported_reloc_global(object, r_type, gsym);
2972             break;
2973
2974           case elfcpp::R_X86_64_TLSDESC_CALL:
2975             break;
2976
2977           case elfcpp::R_X86_64_TLSLD:       // Local-dynamic
2978             if (optimized_type == tls::TLSOPT_NONE)
2979               {
2980                 // Create a GOT entry for the module index.
2981                 target->got_mod_index_entry(symtab, layout, object);
2982               }
2983             else if (optimized_type != tls::TLSOPT_TO_LE)
2984               unsupported_reloc_global(object, r_type, gsym);
2985             break;
2986
2987           case elfcpp::R_X86_64_DTPOFF32:
2988           case elfcpp::R_X86_64_DTPOFF64:
2989             break;
2990
2991           case elfcpp::R_X86_64_GOTTPOFF:    // Initial-exec
2992             layout->set_has_static_tls();
2993             if (optimized_type == tls::TLSOPT_NONE)
2994               {
2995                 // Create a GOT entry for the tp-relative offset.
2996                 Output_data_got<64, false>* got
2997                     = target->got_section(symtab, layout);
2998                 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
2999                                          target->rela_dyn_section(layout),
3000                                          elfcpp::R_X86_64_TPOFF64);
3001               }
3002             else if (optimized_type != tls::TLSOPT_TO_LE)
3003               unsupported_reloc_global(object, r_type, gsym);
3004             break;
3005
3006           case elfcpp::R_X86_64_TPOFF32:     // Local-exec
3007             layout->set_has_static_tls();
3008             if (parameters->options().shared())
3009               unsupported_reloc_global(object, r_type, gsym);
3010             break;
3011
3012           default:
3013             gold_unreachable();
3014           }
3015       }
3016       break;
3017
3018     case elfcpp::R_X86_64_SIZE32:
3019     case elfcpp::R_X86_64_SIZE64:
3020     default:
3021       gold_error(_("%s: unsupported reloc %u against global symbol %s"),
3022                  object->name().c_str(), r_type,
3023                  gsym->demangled_name().c_str());
3024       break;
3025     }
3026 }
3027
3028 template<int size>
3029 void
3030 Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab,
3031                                        Layout* layout,
3032                                        Sized_relobj_file<size, false>* object,
3033                                        unsigned int data_shndx,
3034                                        unsigned int sh_type,
3035                                        const unsigned char* prelocs,
3036                                        size_t reloc_count,
3037                                        Output_section* output_section,
3038                                        bool needs_special_offset_handling,
3039                                        size_t local_symbol_count,
3040                                        const unsigned char* plocal_symbols)
3041 {
3042
3043   if (sh_type == elfcpp::SHT_REL)
3044     {
3045       return;
3046     }
3047
3048    gold::gc_process_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
3049                            typename Target_x86_64<size>::Scan,
3050                            typename Target_x86_64<size>::Relocatable_size_for_reloc>(
3051     symtab,
3052     layout,
3053     this,
3054     object,
3055     data_shndx,
3056     prelocs,
3057     reloc_count,
3058     output_section,
3059     needs_special_offset_handling,
3060     local_symbol_count,
3061     plocal_symbols);
3062
3063 }
3064 // Scan relocations for a section.
3065
3066 template<int size>
3067 void
3068 Target_x86_64<size>::scan_relocs(Symbol_table* symtab,
3069                                  Layout* layout,
3070                                  Sized_relobj_file<size, false>* object,
3071                                  unsigned int data_shndx,
3072                                  unsigned int sh_type,
3073                                  const unsigned char* prelocs,
3074                                  size_t reloc_count,
3075                                  Output_section* output_section,
3076                                  bool needs_special_offset_handling,
3077                                  size_t local_symbol_count,
3078                                  const unsigned char* plocal_symbols)
3079 {
3080   if (sh_type == elfcpp::SHT_REL)
3081     {
3082       gold_error(_("%s: unsupported REL reloc section"),
3083                  object->name().c_str());
3084       return;
3085     }
3086
3087   gold::scan_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
3088       typename Target_x86_64<size>::Scan>(
3089     symtab,
3090     layout,
3091     this,
3092     object,
3093     data_shndx,
3094     prelocs,
3095     reloc_count,
3096     output_section,
3097     needs_special_offset_handling,
3098     local_symbol_count,
3099     plocal_symbols);
3100 }
3101
3102 // Finalize the sections.
3103
3104 template<int size>
3105 void
3106 Target_x86_64<size>::do_finalize_sections(
3107     Layout* layout,
3108     const Input_objects*,
3109     Symbol_table* symtab)
3110 {
3111   const Reloc_section* rel_plt = (this->plt_ == NULL
3112                                   ? NULL
3113                                   : this->plt_->rela_plt());
3114   layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
3115                                   this->rela_dyn_, true, false);
3116
3117   // Fill in some more dynamic tags.
3118   Output_data_dynamic* const odyn = layout->dynamic_data();
3119   if (odyn != NULL)
3120     {
3121       if (this->plt_ != NULL
3122           && this->plt_->output_section() != NULL
3123           && this->plt_->has_tlsdesc_entry())
3124         {
3125           unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
3126           unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
3127           this->got_->finalize_data_size();
3128           odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
3129                                         this->plt_, plt_offset);
3130           odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
3131                                         this->got_, got_offset);
3132         }
3133     }
3134
3135   // Emit any relocs we saved in an attempt to avoid generating COPY
3136   // relocs.
3137   if (this->copy_relocs_.any_saved_relocs())
3138     this->copy_relocs_.emit(this->rela_dyn_section(layout));
3139
3140   // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
3141   // the .got.plt section.
3142   Symbol* sym = this->global_offset_table_;
3143   if (sym != NULL)
3144     {
3145       uint64_t data_size = this->got_plt_->current_data_size();
3146       symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
3147     }
3148
3149   if (parameters->doing_static_link()
3150       && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
3151     {
3152       // If linking statically, make sure that the __rela_iplt symbols
3153       // were defined if necessary, even if we didn't create a PLT.
3154       static const Define_symbol_in_segment syms[] =
3155         {
3156           {
3157             "__rela_iplt_start",        // name
3158             elfcpp::PT_LOAD,            // segment_type
3159             elfcpp::PF_W,               // segment_flags_set
3160             elfcpp::PF(0),              // segment_flags_clear
3161             0,                          // value
3162             0,                          // size
3163             elfcpp::STT_NOTYPE,         // type
3164             elfcpp::STB_GLOBAL,         // binding
3165             elfcpp::STV_HIDDEN,         // visibility
3166             0,                          // nonvis
3167             Symbol::SEGMENT_START,      // offset_from_base
3168             true                        // only_if_ref
3169           },
3170           {
3171             "__rela_iplt_end",          // name
3172             elfcpp::PT_LOAD,            // segment_type
3173             elfcpp::PF_W,               // segment_flags_set
3174             elfcpp::PF(0),              // segment_flags_clear
3175             0,                          // value
3176             0,                          // size
3177             elfcpp::STT_NOTYPE,         // type
3178             elfcpp::STB_GLOBAL,         // binding
3179             elfcpp::STV_HIDDEN,         // visibility
3180             0,                          // nonvis
3181             Symbol::SEGMENT_START,      // offset_from_base
3182             true                        // only_if_ref
3183           }
3184         };
3185
3186       symtab->define_symbols(layout, 2, syms,
3187                              layout->script_options()->saw_sections_clause());
3188     }
3189 }
3190
3191 // Perform a relocation.
3192
3193 template<int size>
3194 inline bool
3195 Target_x86_64<size>::Relocate::relocate(
3196     const Relocate_info<size, false>* relinfo,
3197     Target_x86_64<size>* target,
3198     Output_section*,
3199     size_t relnum,
3200     const elfcpp::Rela<size, false>& rela,
3201     unsigned int r_type,
3202     const Sized_symbol<size>* gsym,
3203     const Symbol_value<size>* psymval,
3204     unsigned char* view,
3205     typename elfcpp::Elf_types<size>::Elf_Addr address,
3206     section_size_type view_size)
3207 {
3208   if (this->skip_call_tls_get_addr_)
3209     {
3210       if ((r_type != elfcpp::R_X86_64_PLT32
3211            && r_type != elfcpp::R_X86_64_PC32)
3212           || gsym == NULL
3213           || strcmp(gsym->name(), "__tls_get_addr") != 0)
3214         {
3215           gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3216                                  _("missing expected TLS relocation"));
3217         }
3218       else
3219         {
3220           this->skip_call_tls_get_addr_ = false;
3221           return false;
3222         }
3223     }
3224
3225   const Sized_relobj_file<size, false>* object = relinfo->object;
3226
3227   // Pick the value to use for symbols defined in the PLT.
3228   Symbol_value<size> symval;
3229   if (gsym != NULL
3230       && gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
3231     {
3232       symval.set_output_value(target->plt_address_for_global(gsym)
3233                               + gsym->plt_offset());
3234       psymval = &symval;
3235     }
3236   else if (gsym == NULL && psymval->is_ifunc_symbol())
3237     {
3238       unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3239       if (object->local_has_plt_offset(r_sym))
3240         {
3241           symval.set_output_value(target->plt_address_for_local(object, r_sym)
3242                                   + object->local_plt_offset(r_sym));
3243           psymval = &symval;
3244         }
3245     }
3246
3247   const elfcpp::Elf_Xword addend = rela.get_r_addend();
3248
3249   // Get the GOT offset if needed.
3250   // The GOT pointer points to the end of the GOT section.
3251   // We need to subtract the size of the GOT section to get
3252   // the actual offset to use in the relocation.
3253   bool have_got_offset = false;
3254   unsigned int got_offset = 0;
3255   switch (r_type)
3256     {
3257     case elfcpp::R_X86_64_GOT32:
3258     case elfcpp::R_X86_64_GOT64:
3259     case elfcpp::R_X86_64_GOTPLT64:
3260     case elfcpp::R_X86_64_GOTPCREL:
3261     case elfcpp::R_X86_64_GOTPCREL64:
3262       if (gsym != NULL)
3263         {
3264           gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
3265           got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
3266         }
3267       else
3268         {
3269           unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3270           gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
3271           got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
3272                         - target->got_size());
3273         }
3274       have_got_offset = true;
3275       break;
3276
3277     default:
3278       break;
3279     }
3280
3281   switch (r_type)
3282     {
3283     case elfcpp::R_X86_64_NONE:
3284     case elfcpp::R_X86_64_GNU_VTINHERIT:
3285     case elfcpp::R_X86_64_GNU_VTENTRY:
3286       break;
3287
3288     case elfcpp::R_X86_64_64:
3289       Relocate_functions<size, false>::rela64(view, object, psymval, addend);
3290       break;
3291
3292     case elfcpp::R_X86_64_PC64:
3293       Relocate_functions<size, false>::pcrela64(view, object, psymval, addend,
3294                                               address);
3295       break;
3296
3297     case elfcpp::R_X86_64_32:
3298       // FIXME: we need to verify that value + addend fits into 32 bits:
3299       //    uint64_t x = value + addend;
3300       //    x == static_cast<uint64_t>(static_cast<uint32_t>(x))
3301       // Likewise for other <=32-bit relocations (but see R_X86_64_32S).
3302       Relocate_functions<size, false>::rela32(view, object, psymval, addend);
3303       break;
3304
3305     case elfcpp::R_X86_64_32S:
3306       // FIXME: we need to verify that value + addend fits into 32 bits:
3307       //    int64_t x = value + addend;   // note this quantity is signed!
3308       //    x == static_cast<int64_t>(static_cast<int32_t>(x))
3309       Relocate_functions<size, false>::rela32(view, object, psymval, addend);
3310       break;
3311
3312     case elfcpp::R_X86_64_PC32:
3313       Relocate_functions<size, false>::pcrela32(view, object, psymval, addend,
3314                                                 address);
3315       break;
3316
3317     case elfcpp::R_X86_64_16:
3318       Relocate_functions<size, false>::rela16(view, object, psymval, addend);
3319       break;
3320
3321     case elfcpp::R_X86_64_PC16:
3322       Relocate_functions<size, false>::pcrela16(view, object, psymval, addend,
3323                                                 address);
3324       break;
3325
3326     case elfcpp::R_X86_64_8:
3327       Relocate_functions<size, false>::rela8(view, object, psymval, addend);
3328       break;
3329
3330     case elfcpp::R_X86_64_PC8:
3331       Relocate_functions<size, false>::pcrela8(view, object, psymval, addend,
3332                                                address);
3333       break;
3334
3335     case elfcpp::R_X86_64_PLT32:
3336       gold_assert(gsym == NULL
3337                   || gsym->has_plt_offset()
3338                   || gsym->final_value_is_known()
3339                   || (gsym->is_defined()
3340                       && !gsym->is_from_dynobj()
3341                       && !gsym->is_preemptible()));
3342       // Note: while this code looks the same as for R_X86_64_PC32, it
3343       // behaves differently because psymval was set to point to
3344       // the PLT entry, rather than the symbol, in Scan::global().
3345       Relocate_functions<size, false>::pcrela32(view, object, psymval, addend,
3346                                                 address);
3347       break;
3348
3349     case elfcpp::R_X86_64_PLTOFF64:
3350       {
3351         gold_assert(gsym);
3352         gold_assert(gsym->has_plt_offset()
3353                     || gsym->final_value_is_known());
3354         typename elfcpp::Elf_types<size>::Elf_Addr got_address;
3355         got_address = target->got_section(NULL, NULL)->address();
3356         Relocate_functions<size, false>::rela64(view, object, psymval,
3357                                                 addend - got_address);
3358       }
3359
3360     case elfcpp::R_X86_64_GOT32:
3361       gold_assert(have_got_offset);
3362       Relocate_functions<size, false>::rela32(view, got_offset, addend);
3363       break;
3364
3365     case elfcpp::R_X86_64_GOTPC32:
3366       {
3367         gold_assert(gsym);
3368         typename elfcpp::Elf_types<size>::Elf_Addr value;
3369         value = target->got_plt_section()->address();
3370         Relocate_functions<size, false>::pcrela32(view, value, addend, address);
3371       }
3372       break;
3373
3374     case elfcpp::R_X86_64_GOT64:
3375       // The ABI doc says "Like GOT64, but indicates a PLT entry is needed."
3376       // Since we always add a PLT entry, this is equivalent.
3377     case elfcpp::R_X86_64_GOTPLT64:
3378       gold_assert(have_got_offset);
3379       Relocate_functions<size, false>::rela64(view, got_offset, addend);
3380       break;
3381
3382     case elfcpp::R_X86_64_GOTPC64:
3383       {
3384         gold_assert(gsym);
3385         typename elfcpp::Elf_types<size>::Elf_Addr value;
3386         value = target->got_plt_section()->address();
3387         Relocate_functions<size, false>::pcrela64(view, value, addend, address);
3388       }
3389       break;
3390
3391     case elfcpp::R_X86_64_GOTOFF64:
3392       {
3393         typename elfcpp::Elf_types<size>::Elf_Addr value;
3394         value = (psymval->value(object, 0)
3395                  - target->got_plt_section()->address());
3396         Relocate_functions<size, false>::rela64(view, value, addend);
3397       }
3398       break;
3399
3400     case elfcpp::R_X86_64_GOTPCREL:
3401       {
3402         gold_assert(have_got_offset);
3403         typename elfcpp::Elf_types<size>::Elf_Addr value;
3404         value = target->got_plt_section()->address() + got_offset;
3405         Relocate_functions<size, false>::pcrela32(view, value, addend, address);
3406       }
3407       break;
3408
3409     case elfcpp::R_X86_64_GOTPCREL64:
3410       {
3411         gold_assert(have_got_offset);
3412         typename elfcpp::Elf_types<size>::Elf_Addr value;
3413         value = target->got_plt_section()->address() + got_offset;
3414         Relocate_functions<size, false>::pcrela64(view, value, addend, address);
3415       }
3416       break;
3417
3418     case elfcpp::R_X86_64_COPY:
3419     case elfcpp::R_X86_64_GLOB_DAT:
3420     case elfcpp::R_X86_64_JUMP_SLOT:
3421     case elfcpp::R_X86_64_RELATIVE:
3422     case elfcpp::R_X86_64_IRELATIVE:
3423       // These are outstanding tls relocs, which are unexpected when linking
3424     case elfcpp::R_X86_64_TPOFF64:
3425     case elfcpp::R_X86_64_DTPMOD64:
3426     case elfcpp::R_X86_64_TLSDESC:
3427       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3428                              _("unexpected reloc %u in object file"),
3429                              r_type);
3430       break;
3431
3432       // These are initial tls relocs, which are expected when linking
3433     case elfcpp::R_X86_64_TLSGD:            // Global-dynamic
3434     case elfcpp::R_X86_64_GOTPC32_TLSDESC:  // Global-dynamic (from ~oliva url)
3435     case elfcpp::R_X86_64_TLSDESC_CALL:
3436     case elfcpp::R_X86_64_TLSLD:            // Local-dynamic
3437     case elfcpp::R_X86_64_DTPOFF32:
3438     case elfcpp::R_X86_64_DTPOFF64:
3439     case elfcpp::R_X86_64_GOTTPOFF:         // Initial-exec
3440     case elfcpp::R_X86_64_TPOFF32:          // Local-exec
3441       this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval,
3442                          view, address, view_size);
3443       break;
3444
3445     case elfcpp::R_X86_64_SIZE32:
3446     case elfcpp::R_X86_64_SIZE64:
3447     default:
3448       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3449                              _("unsupported reloc %u"),
3450                              r_type);
3451       break;
3452     }
3453
3454   return true;
3455 }
3456
3457 // Perform a TLS relocation.
3458
3459 template<int size>
3460 inline void
3461 Target_x86_64<size>::Relocate::relocate_tls(
3462     const Relocate_info<size, false>* relinfo,
3463     Target_x86_64<size>* target,
3464     size_t relnum,
3465     const elfcpp::Rela<size, false>& rela,
3466     unsigned int r_type,
3467     const Sized_symbol<size>* gsym,
3468     const Symbol_value<size>* psymval,
3469     unsigned char* view,
3470     typename elfcpp::Elf_types<size>::Elf_Addr address,
3471     section_size_type view_size)
3472 {
3473   Output_segment* tls_segment = relinfo->layout->tls_segment();
3474
3475   const Sized_relobj_file<size, false>* object = relinfo->object;
3476   const elfcpp::Elf_Xword addend = rela.get_r_addend();
3477   elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr);
3478   bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0;
3479
3480   typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0);
3481
3482   const bool is_final = (gsym == NULL
3483                          ? !parameters->options().shared()
3484                          : gsym->final_value_is_known());
3485   tls::Tls_optimization optimized_type
3486       = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
3487   switch (r_type)
3488     {
3489     case elfcpp::R_X86_64_TLSGD:            // Global-dynamic
3490       if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3491         {
3492           // If this code sequence is used in a non-executable section,
3493           // we will not optimize the R_X86_64_DTPOFF32/64 relocation,
3494           // on the assumption that it's being used by itself in a debug
3495           // section.  Therefore, in the unlikely event that the code
3496           // sequence appears in a non-executable section, we simply
3497           // leave it unoptimized.
3498           optimized_type = tls::TLSOPT_NONE;
3499         }
3500       if (optimized_type == tls::TLSOPT_TO_LE)
3501         {
3502           if (tls_segment == NULL)
3503             {
3504               gold_assert(parameters->errors()->error_count() > 0
3505                           || issue_undefined_symbol_error(gsym));
3506               return;
3507             }
3508           this->tls_gd_to_le(relinfo, relnum, tls_segment,
3509                              rela, r_type, value, view,
3510                              view_size);
3511           break;
3512         }
3513       else
3514         {
3515           unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
3516                                    ? GOT_TYPE_TLS_OFFSET
3517                                    : GOT_TYPE_TLS_PAIR);
3518           unsigned int got_offset;
3519           if (gsym != NULL)
3520             {
3521               gold_assert(gsym->has_got_offset(got_type));
3522               got_offset = gsym->got_offset(got_type) - target->got_size();
3523             }
3524           else
3525             {
3526               unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3527               gold_assert(object->local_has_got_offset(r_sym, got_type));
3528               got_offset = (object->local_got_offset(r_sym, got_type)
3529                             - target->got_size());
3530             }
3531           if (optimized_type == tls::TLSOPT_TO_IE)
3532             {
3533               value = target->got_plt_section()->address() + got_offset;
3534               this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type,
3535                                  value, view, address, view_size);
3536               break;
3537             }
3538           else if (optimized_type == tls::TLSOPT_NONE)
3539             {
3540               // Relocate the field with the offset of the pair of GOT
3541               // entries.
3542               value = target->got_plt_section()->address() + got_offset;
3543               Relocate_functions<size, false>::pcrela32(view, value, addend,
3544                                                         address);
3545               break;
3546             }
3547         }
3548       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3549                              _("unsupported reloc %u"), r_type);
3550       break;
3551
3552     case elfcpp::R_X86_64_GOTPC32_TLSDESC:  // Global-dynamic (from ~oliva url)
3553     case elfcpp::R_X86_64_TLSDESC_CALL:
3554       if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3555         {
3556           // See above comment for R_X86_64_TLSGD.
3557           optimized_type = tls::TLSOPT_NONE;
3558         }
3559       if (optimized_type == tls::TLSOPT_TO_LE)
3560         {
3561           if (tls_segment == NULL)
3562             {
3563               gold_assert(parameters->errors()->error_count() > 0
3564                           || issue_undefined_symbol_error(gsym));
3565               return;
3566             }
3567           this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
3568                                   rela, r_type, value, view,
3569                                   view_size);
3570           break;
3571         }
3572       else
3573         {
3574           unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
3575                                    ? GOT_TYPE_TLS_OFFSET
3576                                    : GOT_TYPE_TLS_DESC);
3577           unsigned int got_offset = 0;
3578           if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC
3579               && optimized_type == tls::TLSOPT_NONE)
3580             {
3581               // We created GOT entries in the .got.tlsdesc portion of
3582               // the .got.plt section, but the offset stored in the
3583               // symbol is the offset within .got.tlsdesc.
3584               got_offset = (target->got_size()
3585                             + target->got_plt_section()->data_size());
3586             }
3587           if (gsym != NULL)
3588             {
3589               gold_assert(gsym->has_got_offset(got_type));
3590               got_offset += gsym->got_offset(got_type) - target->got_size();
3591             }
3592           else
3593             {
3594               unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3595               gold_assert(object->local_has_got_offset(r_sym, got_type));
3596               got_offset += (object->local_got_offset(r_sym, got_type)
3597                              - target->got_size());
3598             }
3599           if (optimized_type == tls::TLSOPT_TO_IE)
3600             {
3601               if (tls_segment == NULL)
3602                 {
3603                   gold_assert(parameters->errors()->error_count() > 0
3604                               || issue_undefined_symbol_error(gsym));
3605                   return;
3606                 }
3607               value = target->got_plt_section()->address() + got_offset;
3608               this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment,
3609                                       rela, r_type, value, view, address,
3610                                       view_size);
3611               break;
3612             }
3613           else if (optimized_type == tls::TLSOPT_NONE)
3614             {
3615               if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
3616                 {
3617                   // Relocate the field with the offset of the pair of GOT
3618                   // entries.
3619                   value = target->got_plt_section()->address() + got_offset;
3620                   Relocate_functions<size, false>::pcrela32(view, value, addend,
3621                                                             address);
3622                 }
3623               break;
3624             }
3625         }
3626       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3627                              _("unsupported reloc %u"), r_type);
3628       break;
3629
3630     case elfcpp::R_X86_64_TLSLD:            // Local-dynamic
3631       if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3632         {
3633           // See above comment for R_X86_64_TLSGD.
3634           optimized_type = tls::TLSOPT_NONE;
3635         }
3636       if (optimized_type == tls::TLSOPT_TO_LE)
3637         {
3638           if (tls_segment == NULL)
3639             {
3640               gold_assert(parameters->errors()->error_count() > 0
3641                           || issue_undefined_symbol_error(gsym));
3642               return;
3643             }
3644           this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type,
3645                              value, view, view_size);
3646           break;
3647         }
3648       else if (optimized_type == tls::TLSOPT_NONE)
3649         {
3650           // Relocate the field with the offset of the GOT entry for
3651           // the module index.
3652           unsigned int got_offset;
3653           got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
3654                         - target->got_size());
3655           value = target->got_plt_section()->address() + got_offset;
3656           Relocate_functions<size, false>::pcrela32(view, value, addend,
3657                                                     address);
3658           break;
3659         }
3660       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3661                              _("unsupported reloc %u"), r_type);
3662       break;
3663
3664     case elfcpp::R_X86_64_DTPOFF32:
3665       // This relocation type is used in debugging information.
3666       // In that case we need to not optimize the value.  If the
3667       // section is not executable, then we assume we should not
3668       // optimize this reloc.  See comments above for R_X86_64_TLSGD,
3669       // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
3670       // R_X86_64_TLSLD.
3671       if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
3672         {
3673           if (tls_segment == NULL)
3674             {
3675               gold_assert(parameters->errors()->error_count() > 0
3676                           || issue_undefined_symbol_error(gsym));
3677               return;
3678             }
3679           value -= tls_segment->memsz();
3680         }
3681       Relocate_functions<size, false>::rela32(view, value, addend);
3682       break;
3683
3684     case elfcpp::R_X86_64_DTPOFF64:
3685       // See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
3686       if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
3687         {
3688           if (tls_segment == NULL)
3689             {
3690               gold_assert(parameters->errors()->error_count() > 0
3691                           || issue_undefined_symbol_error(gsym));
3692               return;
3693             }
3694           value -= tls_segment->memsz();
3695         }
3696       Relocate_functions<size, false>::rela64(view, value, addend);
3697       break;
3698
3699     case elfcpp::R_X86_64_GOTTPOFF:         // Initial-exec
3700       if (optimized_type == tls::TLSOPT_TO_LE)
3701         {
3702           if (tls_segment == NULL)
3703             {
3704               gold_assert(parameters->errors()->error_count() > 0
3705                           || issue_undefined_symbol_error(gsym));
3706               return;
3707             }
3708           Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
3709                                                       tls_segment, rela,
3710                                                       r_type, value, view,
3711                                                       view_size);
3712           break;
3713         }
3714       else if (optimized_type == tls::TLSOPT_NONE)
3715         {
3716           // Relocate the field with the offset of the GOT entry for
3717           // the tp-relative offset of the symbol.
3718           unsigned int got_offset;
3719           if (gsym != NULL)
3720             {
3721               gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET));
3722               got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET)
3723                             - target->got_size());
3724             }
3725           else
3726             {
3727               unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3728               gold_assert(object->local_has_got_offset(r_sym,
3729                                                        GOT_TYPE_TLS_OFFSET));
3730               got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET)
3731                             - target->got_size());
3732             }
3733           value = target->got_plt_section()->address() + got_offset;
3734           Relocate_functions<size, false>::pcrela32(view, value, addend,
3735                                                     address);
3736           break;
3737         }
3738       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3739                              _("unsupported reloc type %u"),
3740                              r_type);
3741       break;
3742
3743     case elfcpp::R_X86_64_TPOFF32:          // Local-exec
3744       if (tls_segment == NULL)
3745         {
3746           gold_assert(parameters->errors()->error_count() > 0
3747                       || issue_undefined_symbol_error(gsym));
3748           return;
3749         }
3750       value -= tls_segment->memsz();
3751       Relocate_functions<size, false>::rela32(view, value, addend);
3752       break;
3753     }
3754 }
3755
3756 // Do a relocation in which we convert a TLS General-Dynamic to an
3757 // Initial-Exec.
3758
3759 template<int size>
3760 inline void
3761 Target_x86_64<size>::Relocate::tls_gd_to_ie(
3762     const Relocate_info<size, false>* relinfo,
3763     size_t relnum,
3764     Output_segment*,
3765     const elfcpp::Rela<size, false>& rela,
3766     unsigned int,
3767     typename elfcpp::Elf_types<size>::Elf_Addr value,
3768     unsigned char* view,
3769     typename elfcpp::Elf_types<size>::Elf_Addr address,
3770     section_size_type view_size)
3771 {
3772   // For SIZE == 64:
3773   //    .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
3774   //    .word 0x6666; rex64; call __tls_get_addr
3775   //    ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
3776   // For SIZE == 32:
3777   //    leaq foo@tlsgd(%rip),%rdi;
3778   //    .word 0x6666; rex64; call __tls_get_addr
3779   //    ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
3780
3781   tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
3782   tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3783                  (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
3784
3785   if (size == 64)
3786     {
3787       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
3788                        -4);
3789       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3790                      (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
3791       memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
3792              16);
3793     }
3794   else
3795     {
3796       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
3797                        -3);
3798       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3799                      (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
3800       memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
3801              15);
3802     }
3803
3804   const elfcpp::Elf_Xword addend = rela.get_r_addend();
3805   Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8,
3806                                             address);
3807
3808   // The next reloc should be a PLT32 reloc against __tls_get_addr.
3809   // We can skip it.
3810   this->skip_call_tls_get_addr_ = true;
3811 }
3812
3813 // Do a relocation in which we convert a TLS General-Dynamic to a
3814 // Local-Exec.
3815
3816 template<int size>
3817 inline void
3818 Target_x86_64<size>::Relocate::tls_gd_to_le(
3819     const Relocate_info<size, false>* relinfo,
3820     size_t relnum,
3821     Output_segment* tls_segment,
3822     const elfcpp::Rela<size, false>& rela,
3823     unsigned int,
3824     typename elfcpp::Elf_types<size>::Elf_Addr value,
3825     unsigned char* view,
3826     section_size_type view_size)
3827 {
3828   // For SIZE == 64:
3829   //    .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
3830   //    .word 0x6666; rex64; call __tls_get_addr
3831   //    ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
3832   // For SIZE == 32:
3833   //    leaq foo@tlsgd(%rip),%rdi;
3834   //    .word 0x6666; rex64; call __tls_get_addr
3835   //    ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
3836
3837   tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
3838   tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3839                  (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
3840
3841   if (size == 64)
3842     {
3843       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
3844                        -4);
3845       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3846                      (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
3847       memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
3848              16);
3849     }
3850   else
3851     {
3852       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
3853                        -3);
3854       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3855                      (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
3856
3857       memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
3858              15);
3859     }
3860
3861   value -= tls_segment->memsz();
3862   Relocate_functions<size, false>::rela32(view + 8, value, 0);
3863
3864   // The next reloc should be a PLT32 reloc against __tls_get_addr.
3865   // We can skip it.
3866   this->skip_call_tls_get_addr_ = true;
3867 }
3868
3869 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
3870
3871 template<int size>
3872 inline void
3873 Target_x86_64<size>::Relocate::tls_desc_gd_to_ie(
3874     const Relocate_info<size, false>* relinfo,
3875     size_t relnum,
3876     Output_segment*,
3877     const elfcpp::Rela<size, false>& rela,
3878     unsigned int r_type,
3879     typename elfcpp::Elf_types<size>::Elf_Addr value,
3880     unsigned char* view,
3881     typename elfcpp::Elf_types<size>::Elf_Addr address,
3882     section_size_type view_size)
3883 {
3884   if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
3885     {
3886       // leaq foo@tlsdesc(%rip), %rax
3887       // ==> movq foo@gottpoff(%rip), %rax
3888       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
3889       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
3890       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3891                      view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
3892       view[-2] = 0x8b;
3893       const elfcpp::Elf_Xword addend = rela.get_r_addend();
3894       Relocate_functions<size, false>::pcrela32(view, value, addend, address);
3895     }
3896   else
3897     {
3898       // call *foo@tlscall(%rax)
3899       // ==> nop; nop
3900       gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
3901       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
3902       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3903                      view[0] == 0xff && view[1] == 0x10);
3904       view[0] = 0x66;
3905       view[1] = 0x90;
3906     }
3907 }
3908
3909 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
3910
3911 template<int size>
3912 inline void
3913 Target_x86_64<size>::Relocate::tls_desc_gd_to_le(
3914     const Relocate_info<size, false>* relinfo,
3915     size_t relnum,
3916     Output_segment* tls_segment,
3917     const elfcpp::Rela<size, false>& rela,
3918     unsigned int r_type,
3919     typename elfcpp::Elf_types<size>::Elf_Addr value,
3920     unsigned char* view,
3921     section_size_type view_size)
3922 {
3923   if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
3924     {
3925       // leaq foo@tlsdesc(%rip), %rax
3926       // ==> movq foo@tpoff, %rax
3927       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
3928       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
3929       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3930                      view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
3931       view[-2] = 0xc7;
3932       view[-1] = 0xc0;
3933       value -= tls_segment->memsz();
3934       Relocate_functions<size, false>::rela32(view, value, 0);
3935     }
3936   else
3937     {
3938       // call *foo@tlscall(%rax)
3939       // ==> nop; nop
3940       gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
3941       tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
3942       tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3943                      view[0] == 0xff && view[1] == 0x10);
3944       view[0] = 0x66;
3945       view[1] = 0x90;
3946     }
3947 }
3948
3949 template<int size>
3950 inline void
3951 Target_x86_64<size>::Relocate::tls_ld_to_le(
3952     const Relocate_info<size, false>* relinfo,
3953     size_t relnum,
3954     Output_segment*,
3955     const elfcpp::Rela<size, false>& rela,
3956     unsigned int,
3957     typename elfcpp::Elf_types<size>::Elf_Addr,
3958     unsigned char* view,
3959     section_size_type view_size)
3960 {
3961   // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
3962   // ... leq foo@dtpoff(%rax),%reg
3963   // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
3964
3965   tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
3966   tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9);
3967
3968   tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3969                  view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d);
3970
3971   tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8);
3972
3973   memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
3974
3975   // The next reloc should be a PLT32 reloc against __tls_get_addr.
3976   // We can skip it.
3977   this->skip_call_tls_get_addr_ = true;
3978 }
3979
3980 // Do a relocation in which we convert a TLS Initial-Exec to a
3981 // Local-Exec.
3982
3983 template<int size>
3984 inline void
3985 Target_x86_64<size>::Relocate::tls_ie_to_le(
3986     const Relocate_info<size, false>* relinfo,
3987     size_t relnum,
3988     Output_segment* tls_segment,
3989     const elfcpp::Rela<size, false>& rela,
3990     unsigned int,
3991     typename elfcpp::Elf_types<size>::Elf_Addr value,
3992     unsigned char* view,
3993     section_size_type view_size)
3994 {
3995   // We need to examine the opcodes to figure out which instruction we
3996   // are looking at.
3997
3998   // movq foo@gottpoff(%rip),%reg  ==>  movq $YY,%reg
3999   // addq foo@gottpoff(%rip),%reg  ==>  addq $YY,%reg
4000
4001   tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4002   tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4003
4004   unsigned char op1 = view[-3];
4005   unsigned char op2 = view[-2];
4006   unsigned char op3 = view[-1];
4007   unsigned char reg = op3 >> 3;
4008
4009   if (op2 == 0x8b)
4010     {
4011       // movq
4012       if (op1 == 0x4c)
4013         view[-3] = 0x49;
4014       view[-2] = 0xc7;
4015       view[-1] = 0xc0 | reg;
4016     }
4017   else if (reg == 4)
4018     {
4019       // Special handling for %rsp.
4020       if (op1 == 0x4c)
4021         view[-3] = 0x49;
4022       view[-2] = 0x81;
4023       view[-1] = 0xc0 | reg;
4024     }
4025   else
4026     {
4027       // addq
4028       if (op1 == 0x4c)
4029         view[-3] = 0x4d;
4030       view[-2] = 0x8d;
4031       view[-1] = 0x80 | reg | (reg << 3);
4032     }
4033
4034   value -= tls_segment->memsz();
4035   Relocate_functions<size, false>::rela32(view, value, 0);
4036 }
4037
4038 // Relocate section data.
4039
4040 template<int size>
4041 void
4042 Target_x86_64<size>::relocate_section(
4043     const Relocate_info<size, false>* relinfo,
4044     unsigned int sh_type,
4045     const unsigned char* prelocs,
4046     size_t reloc_count,
4047     Output_section* output_section,
4048     bool needs_special_offset_handling,
4049     unsigned char* view,
4050     typename elfcpp::Elf_types<size>::Elf_Addr address,
4051     section_size_type view_size,
4052     const Reloc_symbol_changes* reloc_symbol_changes)
4053 {
4054   gold_assert(sh_type == elfcpp::SHT_RELA);
4055
4056   gold::relocate_section<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
4057                          typename Target_x86_64<size>::Relocate>(
4058     relinfo,
4059     this,
4060     prelocs,
4061     reloc_count,
4062     output_section,
4063     needs_special_offset_handling,
4064     view,
4065     address,
4066     view_size,
4067     reloc_symbol_changes);
4068 }
4069
4070 // Apply an incremental relocation.  Incremental relocations always refer
4071 // to global symbols.
4072
4073 template<int size>
4074 void
4075 Target_x86_64<size>::apply_relocation(
4076     const Relocate_info<size, false>* relinfo,
4077     typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
4078     unsigned int r_type,
4079     typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
4080     const Symbol* gsym,
4081     unsigned char* view,
4082     typename elfcpp::Elf_types<size>::Elf_Addr address,
4083     section_size_type view_size)
4084 {
4085   gold::apply_relocation<size, false, Target_x86_64<size>,
4086                          typename Target_x86_64<size>::Relocate>(
4087     relinfo,
4088     this,
4089     r_offset,
4090     r_type,
4091     r_addend,
4092     gsym,
4093     view,
4094     address,
4095     view_size);
4096 }
4097
4098 // Return the size of a relocation while scanning during a relocatable
4099 // link.
4100
4101 template<int size>
4102 unsigned int
4103 Target_x86_64<size>::Relocatable_size_for_reloc::get_size_for_reloc(
4104     unsigned int r_type,
4105     Relobj* object)
4106 {
4107   switch (r_type)
4108     {
4109     case elfcpp::R_X86_64_NONE:
4110     case elfcpp::R_X86_64_GNU_VTINHERIT:
4111     case elfcpp::R_X86_64_GNU_VTENTRY:
4112     case elfcpp::R_X86_64_TLSGD:            // Global-dynamic
4113     case elfcpp::R_X86_64_GOTPC32_TLSDESC:  // Global-dynamic (from ~oliva url)
4114     case elfcpp::R_X86_64_TLSDESC_CALL:
4115     case elfcpp::R_X86_64_TLSLD:            // Local-dynamic
4116     case elfcpp::R_X86_64_DTPOFF32:
4117     case elfcpp::R_X86_64_DTPOFF64:
4118     case elfcpp::R_X86_64_GOTTPOFF:         // Initial-exec
4119     case elfcpp::R_X86_64_TPOFF32:          // Local-exec
4120       return 0;
4121
4122     case elfcpp::R_X86_64_64:
4123     case elfcpp::R_X86_64_PC64:
4124     case elfcpp::R_X86_64_GOTOFF64:
4125     case elfcpp::R_X86_64_GOTPC64:
4126     case elfcpp::R_X86_64_PLTOFF64:
4127     case elfcpp::R_X86_64_GOT64:
4128     case elfcpp::R_X86_64_GOTPCREL64:
4129     case elfcpp::R_X86_64_GOTPCREL:
4130     case elfcpp::R_X86_64_GOTPLT64:
4131       return 8;
4132
4133     case elfcpp::R_X86_64_32:
4134     case elfcpp::R_X86_64_32S:
4135     case elfcpp::R_X86_64_PC32:
4136     case elfcpp::R_X86_64_PLT32:
4137     case elfcpp::R_X86_64_GOTPC32:
4138     case elfcpp::R_X86_64_GOT32:
4139       return 4;
4140
4141     case elfcpp::R_X86_64_16:
4142     case elfcpp::R_X86_64_PC16:
4143       return 2;
4144
4145     case elfcpp::R_X86_64_8:
4146     case elfcpp::R_X86_64_PC8:
4147       return 1;
4148
4149     case elfcpp::R_X86_64_COPY:
4150     case elfcpp::R_X86_64_GLOB_DAT:
4151     case elfcpp::R_X86_64_JUMP_SLOT:
4152     case elfcpp::R_X86_64_RELATIVE:
4153     case elfcpp::R_X86_64_IRELATIVE:
4154       // These are outstanding tls relocs, which are unexpected when linking
4155     case elfcpp::R_X86_64_TPOFF64:
4156     case elfcpp::R_X86_64_DTPMOD64:
4157     case elfcpp::R_X86_64_TLSDESC:
4158       object->error(_("unexpected reloc %u in object file"), r_type);
4159       return 0;
4160
4161     case elfcpp::R_X86_64_SIZE32:
4162     case elfcpp::R_X86_64_SIZE64:
4163     default:
4164       object->error(_("unsupported reloc %u against local symbol"), r_type);
4165       return 0;
4166     }
4167 }
4168
4169 // Scan the relocs during a relocatable link.
4170
4171 template<int size>
4172 void
4173 Target_x86_64<size>::scan_relocatable_relocs(
4174     Symbol_table* symtab,
4175     Layout* layout,
4176     Sized_relobj_file<size, false>* object,
4177     unsigned int data_shndx,
4178     unsigned int sh_type,
4179     const unsigned char* prelocs,
4180     size_t reloc_count,
4181     Output_section* output_section,
4182     bool needs_special_offset_handling,
4183     size_t local_symbol_count,
4184     const unsigned char* plocal_symbols,
4185     Relocatable_relocs* rr)
4186 {
4187   gold_assert(sh_type == elfcpp::SHT_RELA);
4188
4189   typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA,
4190     Relocatable_size_for_reloc> Scan_relocatable_relocs;
4191
4192   gold::scan_relocatable_relocs<size, false, elfcpp::SHT_RELA,
4193       Scan_relocatable_relocs>(
4194     symtab,
4195     layout,
4196     object,
4197     data_shndx,
4198     prelocs,
4199     reloc_count,
4200     output_section,
4201     needs_special_offset_handling,
4202     local_symbol_count,
4203     plocal_symbols,
4204     rr);
4205 }
4206
4207 // Relocate a section during a relocatable link.
4208
4209 template<int size>
4210 void
4211 Target_x86_64<size>::relocate_for_relocatable(
4212     const Relocate_info<size, false>* relinfo,
4213     unsigned int sh_type,
4214     const unsigned char* prelocs,
4215     size_t reloc_count,
4216     Output_section* output_section,
4217     off_t offset_in_output_section,
4218     const Relocatable_relocs* rr,
4219     unsigned char* view,
4220     typename elfcpp::Elf_types<size>::Elf_Addr view_address,
4221     section_size_type view_size,
4222     unsigned char* reloc_view,
4223     section_size_type reloc_view_size)
4224 {
4225   gold_assert(sh_type == elfcpp::SHT_RELA);
4226
4227   gold::relocate_for_relocatable<size, false, elfcpp::SHT_RELA>(
4228     relinfo,
4229     prelocs,
4230     reloc_count,
4231     output_section,
4232     offset_in_output_section,
4233     rr,
4234     view,
4235     view_address,
4236     view_size,
4237     reloc_view,
4238     reloc_view_size);
4239 }
4240
4241 // Return the value to use for a dynamic which requires special
4242 // treatment.  This is how we support equality comparisons of function
4243 // pointers across shared library boundaries, as described in the
4244 // processor specific ABI supplement.
4245
4246 template<int size>
4247 uint64_t
4248 Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const
4249 {
4250   gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
4251   return this->plt_address_for_global(gsym) + gsym->plt_offset();
4252 }
4253
4254 // Return a string used to fill a code section with nops to take up
4255 // the specified length.
4256
4257 template<int size>
4258 std::string
4259 Target_x86_64<size>::do_code_fill(section_size_type length) const
4260 {
4261   if (length >= 16)
4262     {
4263       // Build a jmpq instruction to skip over the bytes.
4264       unsigned char jmp[5];
4265       jmp[0] = 0xe9;
4266       elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
4267       return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
4268               + std::string(length - 5, static_cast<char>(0x90)));
4269     }
4270
4271   // Nop sequences of various lengths.
4272   const char nop1[1] = { '\x90' };                 // nop
4273   const char nop2[2] = { '\x66', '\x90' };         // xchg %ax %ax
4274   const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax)
4275   const char nop4[4] = { '\x0f', '\x1f', '\x40',   // nop 0(%rax)
4276                          '\x00'};
4277   const char nop5[5] = { '\x0f', '\x1f', '\x44',   // nop 0(%rax,%rax,1)
4278                          '\x00', '\x00' };
4279   const char nop6[6] = { '\x66', '\x0f', '\x1f',   // nopw 0(%rax,%rax,1)
4280                          '\x44', '\x00', '\x00' };
4281   const char nop7[7] = { '\x0f', '\x1f', '\x80',   // nopl 0L(%rax)
4282                          '\x00', '\x00', '\x00',
4283                          '\x00' };
4284   const char nop8[8] = { '\x0f', '\x1f', '\x84',   // nopl 0L(%rax,%rax,1)
4285                          '\x00', '\x00', '\x00',
4286                          '\x00', '\x00' };
4287   const char nop9[9] = { '\x66', '\x0f', '\x1f',   // nopw 0L(%rax,%rax,1)
4288                          '\x84', '\x00', '\x00',
4289                          '\x00', '\x00', '\x00' };
4290   const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
4291                            '\x1f', '\x84', '\x00',
4292                            '\x00', '\x00', '\x00',
4293                            '\x00' };
4294   const char nop11[11] = { '\x66', '\x66', '\x2e', // data16
4295                            '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
4296                            '\x00', '\x00', '\x00',
4297                            '\x00', '\x00' };
4298   const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16
4299                            '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
4300                            '\x84', '\x00', '\x00',
4301                            '\x00', '\x00', '\x00' };
4302   const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16
4303                            '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
4304                            '\x1f', '\x84', '\x00',
4305                            '\x00', '\x00', '\x00',
4306                            '\x00' };
4307   const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16
4308                            '\x66', '\x66', '\x2e', // data16
4309                            '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
4310                            '\x00', '\x00', '\x00',
4311                            '\x00', '\x00' };
4312   const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16
4313                            '\x66', '\x66', '\x66', // data16; data16
4314                            '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
4315                            '\x84', '\x00', '\x00',
4316                            '\x00', '\x00', '\x00' };
4317
4318   const char* nops[16] = {
4319     NULL,
4320     nop1, nop2, nop3, nop4, nop5, nop6, nop7,
4321     nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15
4322   };
4323
4324   return std::string(nops[length], length);
4325 }
4326
4327 // Return the addend to use for a target specific relocation.  The
4328 // only target specific relocation is R_X86_64_TLSDESC for a local
4329 // symbol.  We want to set the addend is the offset of the local
4330 // symbol in the TLS segment.
4331
4332 template<int size>
4333 uint64_t
4334 Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type,
4335                                      uint64_t) const
4336 {
4337   gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
4338   uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
4339   gold_assert(intarg < this->tlsdesc_reloc_info_.size());
4340   const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
4341   const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
4342   gold_assert(psymval->is_tls_symbol());
4343   // The value of a TLS symbol is the offset in the TLS segment.
4344   return psymval->value(ti.object, 0);
4345 }
4346
4347 // Return the value to use for the base of a DW_EH_PE_datarel offset
4348 // in an FDE.  Solaris and SVR4 use DW_EH_PE_datarel because their
4349 // assembler can not write out the difference between two labels in
4350 // different sections, so instead of using a pc-relative value they
4351 // use an offset from the GOT.
4352
4353 template<int size>
4354 uint64_t
4355 Target_x86_64<size>::do_ehframe_datarel_base() const
4356 {
4357   gold_assert(this->global_offset_table_ != NULL);
4358   Symbol* sym = this->global_offset_table_;
4359   Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym);
4360   return ssym->value();
4361 }
4362
4363 // FNOFFSET in section SHNDX in OBJECT is the start of a function
4364 // compiled with -fsplit-stack.  The function calls non-split-stack
4365 // code.  We have to change the function so that it always ensures
4366 // that it has enough stack space to run some random function.
4367
4368 template<int size>
4369 void
4370 Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx,
4371                                         section_offset_type fnoffset,
4372                                         section_size_type fnsize,
4373                                         unsigned char* view,
4374                                         section_size_type view_size,
4375                                         std::string* from,
4376                                         std::string* to) const
4377 {
4378   // The function starts with a comparison of the stack pointer and a
4379   // field in the TCB.  This is followed by a jump.
4380
4381   // cmp %fs:NN,%rsp
4382   if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5)
4383       && fnsize > 9)
4384     {
4385       // We will call __morestack if the carry flag is set after this
4386       // comparison.  We turn the comparison into an stc instruction
4387       // and some nops.
4388       view[fnoffset] = '\xf9';
4389       this->set_view_to_nop(view, view_size, fnoffset + 1, 8);
4390     }
4391   // lea NN(%rsp),%r10
4392   // lea NN(%rsp),%r11
4393   else if ((this->match_view(view, view_size, fnoffset,
4394                              "\x4c\x8d\x94\x24", 4)
4395             || this->match_view(view, view_size, fnoffset,
4396                                 "\x4c\x8d\x9c\x24", 4))
4397            && fnsize > 8)
4398     {
4399       // This is loading an offset from the stack pointer for a
4400       // comparison.  The offset is negative, so we decrease the
4401       // offset by the amount of space we need for the stack.  This
4402       // means we will avoid calling __morestack if there happens to
4403       // be plenty of space on the stack already.
4404       unsigned char* pval = view + fnoffset + 4;
4405       uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval);
4406       val -= parameters->options().split_stack_adjust_size();
4407       elfcpp::Swap_unaligned<32, false>::writeval(pval, val);
4408     }
4409   else
4410     {
4411       if (!object->has_no_split_stack())
4412         object->error(_("failed to match split-stack sequence at "
4413                         "section %u offset %0zx"),
4414                       shndx, static_cast<size_t>(fnoffset));
4415       return;
4416     }
4417
4418   // We have to change the function so that it calls
4419   // __morestack_non_split instead of __morestack.  The former will
4420   // allocate additional stack space.
4421   *from = "__morestack";
4422   *to = "__morestack_non_split";
4423 }
4424
4425 // The selector for x86_64 object files.  Note this is never instantiated
4426 // directly.  It's only used in Target_selector_x86_64_nacl, below.
4427
4428 template<int size>
4429 class Target_selector_x86_64 : public Target_selector_freebsd
4430 {
4431 public:
4432   Target_selector_x86_64()
4433     : Target_selector_freebsd(elfcpp::EM_X86_64, size, false,
4434                               (size == 64
4435                                ? "elf64-x86-64" : "elf32-x86-64"),
4436                               (size == 64
4437                                ? "elf64-x86-64-freebsd"
4438                                : "elf32-x86-64-freebsd"),
4439                               (size == 64 ? "elf_x86_64" : "elf32_x86_64"))
4440   { }
4441
4442   Target*
4443   do_instantiate_target()
4444   { return new Target_x86_64<size>(); }
4445
4446 };
4447
4448 // NaCl variant.  It uses different PLT contents.
4449
4450 template<int size>
4451 class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size>
4452 {
4453  public:
4454   Output_data_plt_x86_64_nacl(Layout* layout,
4455                               Output_data_got<64, false>* got,
4456                               Output_data_space* got_plt,
4457                               Output_data_space* got_irelative)
4458     : Output_data_plt_x86_64<size>(layout, plt_entry_size,
4459                                    got, got_plt, got_irelative)
4460   { }
4461
4462   Output_data_plt_x86_64_nacl(Layout* layout,
4463                               Output_data_got<64, false>* got,
4464                               Output_data_space* got_plt,
4465                               Output_data_space* got_irelative,
4466                               unsigned int plt_count)
4467     : Output_data_plt_x86_64<size>(layout, plt_entry_size,
4468                                    got, got_plt, got_irelative,
4469                                    plt_count)
4470   { }
4471
4472  protected:
4473   virtual unsigned int
4474   do_get_plt_entry_size() const
4475   { return plt_entry_size; }
4476
4477   virtual void
4478   do_add_eh_frame(Layout* layout)
4479   {
4480     layout->add_eh_frame_for_plt(this,
4481                                  this->plt_eh_frame_cie,
4482                                  this->plt_eh_frame_cie_size,
4483                                  plt_eh_frame_fde,
4484                                  plt_eh_frame_fde_size);
4485   }
4486
4487   virtual void
4488   do_fill_first_plt_entry(unsigned char* pov,
4489                           typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
4490                           typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
4491
4492   virtual unsigned int
4493   do_fill_plt_entry(unsigned char* pov,
4494                     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4495                     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4496                     unsigned int got_offset,
4497                     unsigned int plt_offset,
4498                     unsigned int plt_index);
4499
4500   virtual void
4501   do_fill_tlsdesc_entry(unsigned char* pov,
4502                         typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4503                         typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4504                         typename elfcpp::Elf_types<size>::Elf_Addr got_base,
4505                         unsigned int tlsdesc_got_offset,
4506                         unsigned int plt_offset);
4507
4508  private:
4509   // The size of an entry in the PLT.
4510   static const int plt_entry_size = 64;
4511
4512   // The first entry in the PLT.
4513   static const unsigned char first_plt_entry[plt_entry_size];
4514
4515   // Other entries in the PLT for an executable.
4516   static const unsigned char plt_entry[plt_entry_size];
4517
4518   // The reserved TLSDESC entry in the PLT for an executable.
4519   static const unsigned char tlsdesc_plt_entry[plt_entry_size];
4520
4521   // The .eh_frame unwind information for the PLT.
4522   static const int plt_eh_frame_fde_size = 32;
4523   static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
4524 };
4525
4526 template<int size>
4527 class Target_x86_64_nacl : public Target_x86_64<size>
4528 {
4529  public:
4530   Target_x86_64_nacl()
4531     : Target_x86_64<size>(&x86_64_nacl_info)
4532   { }
4533
4534   virtual Output_data_plt_x86_64<size>*
4535   do_make_data_plt(Layout* layout,
4536                    Output_data_got<64, false>* got,
4537                    Output_data_space* got_plt,
4538                    Output_data_space* got_irelative)
4539   {
4540     return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
4541                                                  got_irelative);
4542   }
4543
4544   virtual Output_data_plt_x86_64<size>*
4545   do_make_data_plt(Layout* layout,
4546                    Output_data_got<64, false>* got,
4547                    Output_data_space* got_plt,
4548                    Output_data_space* got_irelative,
4549                    unsigned int plt_count)
4550   {
4551     return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
4552                                                  got_irelative,
4553                                                  plt_count);
4554   }
4555
4556  private:
4557   static const Target::Target_info x86_64_nacl_info;
4558 };
4559
4560 template<>
4561 const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info =
4562 {
4563   64,                   // size
4564   false,                // is_big_endian
4565   elfcpp::EM_X86_64,    // machine_code
4566   false,                // has_make_symbol
4567   false,                // has_resolve
4568   true,                 // has_code_fill
4569   true,                 // is_default_stack_executable
4570   true,                 // can_icf_inline_merge_sections
4571   '\0',                 // wrap_char
4572   "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker
4573   0x20000,              // default_text_segment_address
4574   0x10000,              // abi_pagesize (overridable by -z max-page-size)
4575   0x10000,              // common_pagesize (overridable by -z common-page-size)
4576   true,                 // isolate_execinstr
4577   0x10000000,           // rosegment_gap
4578   elfcpp::SHN_UNDEF,    // small_common_shndx
4579   elfcpp::SHN_X86_64_LCOMMON,   // large_common_shndx
4580   0,                    // small_common_section_flags
4581   elfcpp::SHF_X86_64_LARGE,     // large_common_section_flags
4582   NULL,                 // attributes_section
4583   NULL                  // attributes_vendor
4584 };
4585
4586 template<>
4587 const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info =
4588 {
4589   32,                   // size
4590   false,                // is_big_endian
4591   elfcpp::EM_X86_64,    // machine_code
4592   false,                // has_make_symbol
4593   false,                // has_resolve
4594   true,                 // has_code_fill
4595   true,                 // is_default_stack_executable
4596   true,                 // can_icf_inline_merge_sections
4597   '\0',                 // wrap_char
4598   "/lib/ld-nacl-x86-64.so.1", // dynamic_linker
4599   0x20000,              // default_text_segment_address
4600   0x10000,              // abi_pagesize (overridable by -z max-page-size)
4601   0x10000,              // common_pagesize (overridable by -z common-page-size)
4602   true,                 // isolate_execinstr
4603   0x10000000,           // rosegment_gap
4604   elfcpp::SHN_UNDEF,    // small_common_shndx
4605   elfcpp::SHN_X86_64_LCOMMON,   // large_common_shndx
4606   0,                    // small_common_section_flags
4607   elfcpp::SHF_X86_64_LARGE,     // large_common_section_flags
4608   NULL,                 // attributes_section
4609   NULL                  // attributes_vendor
4610 };
4611
4612 #define NACLMASK        0xe0            // 32-byte alignment mask.
4613
4614 // The first entry in the PLT.
4615
4616 template<int size>
4617 const unsigned char
4618 Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] =
4619 {
4620   0xff, 0x35,                         // pushq contents of memory address
4621   0, 0, 0, 0,                         // replaced with address of .got + 8
4622   0x4c, 0x8b, 0x1d,                   // mov GOT+16(%rip), %r11
4623   0, 0, 0, 0,                         // replaced with address of .got + 16
4624   0x41, 0x83, 0xe3, NACLMASK,         // and $-32, %r11d
4625   0x4d, 0x01, 0xfb,                   // add %r15, %r11
4626   0x41, 0xff, 0xe3,                   // jmpq *%r11
4627
4628   // 9-byte nop sequence to pad out to the next 32-byte boundary.
4629   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopl %cs:0x0(%rax,%rax,1)
4630
4631   // 32 bytes of nop to pad out to the standard size
4632   0x66, 0x66, 0x66, 0x66, 0x66, 0x66,    // excess data32 prefixes
4633   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4634   0x66, 0x66, 0x66, 0x66, 0x66, 0x66,    // excess data32 prefixes
4635   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4636   0x66,                                  // excess data32 prefix
4637   0x90                                   // nop
4638 };
4639
4640 template<int size>
4641 void
4642 Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry(
4643     unsigned char* pov,
4644     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4645     typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
4646 {
4647   memcpy(pov, first_plt_entry, plt_entry_size);
4648   elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
4649                                               (got_address + 8
4650                                                - (plt_address + 2 + 4)));
4651   elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
4652                                               (got_address + 16
4653                                                - (plt_address + 9 + 4)));
4654 }
4655
4656 // Subsequent entries in the PLT.
4657
4658 template<int size>
4659 const unsigned char
4660 Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] =
4661 {
4662   0x4c, 0x8b, 0x1d,              // mov name@GOTPCREL(%rip),%r11
4663   0, 0, 0, 0,                    // replaced with address of symbol in .got
4664   0x41, 0x83, 0xe3, NACLMASK,    // and $-32, %r11d
4665   0x4d, 0x01, 0xfb,              // add %r15, %r11
4666   0x41, 0xff, 0xe3,              // jmpq *%r11
4667
4668   // 15-byte nop sequence to pad out to the next 32-byte boundary.
4669   0x66, 0x66, 0x66, 0x66, 0x66, 0x66,    // excess data32 prefixes
4670   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4671
4672   // Lazy GOT entries point here (32-byte aligned).
4673   0x68,                       // pushq immediate
4674   0, 0, 0, 0,                 // replaced with index into relocation table
4675   0xe9,                       // jmp relative
4676   0, 0, 0, 0,                 // replaced with offset to start of .plt0
4677
4678   // 22 bytes of nop to pad out to the standard size.
4679   0x66, 0x66, 0x66, 0x66, 0x66, 0x66,    // excess data32 prefixes
4680   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4681   0x0f, 0x1f, 0x80, 0, 0, 0, 0,          // nopl 0x0(%rax)
4682 };
4683
4684 template<int size>
4685 unsigned int
4686 Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry(
4687     unsigned char* pov,
4688     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4689     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4690     unsigned int got_offset,
4691     unsigned int plt_offset,
4692     unsigned int plt_index)
4693 {
4694   memcpy(pov, plt_entry, plt_entry_size);
4695   elfcpp::Swap_unaligned<32, false>::writeval(pov + 3,
4696                                               (got_address + got_offset
4697                                                - (plt_address + plt_offset
4698                                                   + 3 + 4)));
4699
4700   elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index);
4701   elfcpp::Swap_unaligned<32, false>::writeval(pov + 38,
4702                                               - (plt_offset + 38 + 4));
4703
4704   return 32;
4705 }
4706
4707 // The reserved TLSDESC entry in the PLT.
4708
4709 template<int size>
4710 const unsigned char
4711 Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] =
4712 {
4713   0xff, 0x35,                   // pushq x(%rip)
4714   0, 0, 0, 0,   // replaced with address of linkmap GOT entry (at PLTGOT + 8)
4715   0x4c, 0x8b, 0x1d,             // mov y(%rip),%r11
4716   0, 0, 0, 0,   // replaced with offset of reserved TLSDESC_GOT entry
4717   0x41, 0x83, 0xe3, NACLMASK,   // and $-32, %r11d
4718   0x4d, 0x01, 0xfb,             // add %r15, %r11
4719   0x41, 0xff, 0xe3,             // jmpq *%r11
4720
4721   // 41 bytes of nop to pad out to the standard size.
4722   0x66, 0x66, 0x66, 0x66, 0x66, 0x66,    // excess data32 prefixes
4723   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4724   0x66, 0x66, 0x66, 0x66, 0x66, 0x66,    // excess data32 prefixes
4725   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4726   0x66, 0x66,                            // excess data32 prefixes
4727   0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4728 };
4729
4730 template<int size>
4731 void
4732 Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry(
4733     unsigned char* pov,
4734     typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4735     typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4736     typename elfcpp::Elf_types<size>::Elf_Addr got_base,
4737     unsigned int tlsdesc_got_offset,
4738     unsigned int plt_offset)
4739 {
4740   memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
4741   elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
4742                                               (got_address + 8
4743                                                - (plt_address + plt_offset
4744                                                   + 2 + 4)));
4745   elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
4746                                               (got_base
4747                                                + tlsdesc_got_offset
4748                                                - (plt_address + plt_offset
4749                                                   + 9 + 4)));
4750 }
4751
4752 // The .eh_frame unwind information for the PLT.
4753
4754 template<int size>
4755 const unsigned char
4756 Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
4757 {
4758   0, 0, 0, 0,                           // Replaced with offset to .plt.
4759   0, 0, 0, 0,                           // Replaced with size of .plt.
4760   0,                                    // Augmentation size.
4761   elfcpp::DW_CFA_def_cfa_offset, 16,    // DW_CFA_def_cfa_offset: 16.
4762   elfcpp::DW_CFA_advance_loc + 6,       // Advance 6 to __PLT__ + 6.
4763   elfcpp::DW_CFA_def_cfa_offset, 24,    // DW_CFA_def_cfa_offset: 24.
4764   elfcpp::DW_CFA_advance_loc + 58,      // Advance 58 to __PLT__ + 64.
4765   elfcpp::DW_CFA_def_cfa_expression,    // DW_CFA_def_cfa_expression.
4766   13,                                   // Block length.
4767   elfcpp::DW_OP_breg7, 8,               // Push %rsp + 8.
4768   elfcpp::DW_OP_breg16, 0,              // Push %rip.
4769   elfcpp::DW_OP_const1u, 63,            // Push 0x3f.
4770   elfcpp::DW_OP_and,                    // & (%rip & 0x3f).
4771   elfcpp::DW_OP_const1u, 37,            // Push 0x25.
4772   elfcpp::DW_OP_ge,                     // >= ((%rip & 0x3f) >= 0x25)
4773   elfcpp::DW_OP_lit3,                   // Push 3.
4774   elfcpp::DW_OP_shl,                    // << (((%rip & 0x3f) >= 0x25) << 3)
4775   elfcpp::DW_OP_plus,                   // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8
4776   elfcpp::DW_CFA_nop,                   // Align to 32 bytes.
4777   elfcpp::DW_CFA_nop
4778 };
4779
4780 // The selector for x86_64-nacl object files.
4781
4782 template<int size>
4783 class Target_selector_x86_64_nacl
4784   : public Target_selector_nacl<Target_selector_x86_64<size>,
4785                                 Target_x86_64_nacl<size> >
4786 {
4787  public:
4788   Target_selector_x86_64_nacl()
4789     : Target_selector_nacl<Target_selector_x86_64<size>,
4790                            Target_x86_64_nacl<size> >("x86-64",
4791                                                       size == 64
4792                                                       ? "elf64-x86-64-nacl"
4793                                                       : "elf32-x86-64-nacl",
4794                                                       size == 64
4795                                                       ? "elf_x86_64_nacl"
4796                                                       : "elf32_x86_64_nacl")
4797   { }
4798 };
4799
4800 Target_selector_x86_64_nacl<64> target_selector_x86_64;
4801 Target_selector_x86_64_nacl<32> target_selector_x32;
4802
4803 } // End anonymous namespace.