gold/i386.cc

   1 // i386.cc -- i386 target support for gold.
   2
   3 // Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 #include "gold.h"
  24
  25 #include <cstring>
  26
  27 #include "elfcpp.h"
  28 #include "parameters.h"
  29 #include "reloc.h"
  30 #include "i386.h"
  31 #include "object.h"
  32 #include "symtab.h"
  33 #include "layout.h"
  34 #include "output.h"
  35 #include "copy-relocs.h"
  36 #include "target.h"
  37 #include "target-reloc.h"
  38 #include "target-select.h"
  39 #include "tls.h"
  40 #include "freebsd.h"
  41
  42 namespace
  43 {
  44
  45 using namespace gold;
  46
  47 class Output_data_plt_i386;
  48
  49 // The i386 target class.
  50 // TLS info comes from
  51 //   http://people.redhat.com/drepper/tls.pdf
  52 //   http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
  53
  54 class Target_i386 : public Target_freebsd<32, false>
  55 {
  56  public:
  57   typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
  58
  59   Target_i386()
  60     : Target_freebsd<32, false>(&i386_info),
  61       got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL),
  62       copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL),
  63       got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)
  64   { }
  65
  66   // Process the relocations to determine unreferenced sections for
  67   // garbage collection.
  68   void
  69   gc_process_relocs(const General_options& options,
  70                     Symbol_table* symtab,
  71                     Layout* layout,
  72                     Sized_relobj<32, false>* object,
  73                     unsigned int data_shndx,
  74                     unsigned int sh_type,
  75                     const unsigned char* prelocs,
  76                     size_t reloc_count,
  77                     Output_section* output_section,
  78                     bool needs_special_offset_handling,
  79                     size_t local_symbol_count,
  80                     const unsigned char* plocal_symbols);
  81
  82   // Scan the relocations to look for symbol adjustments.
  83   void
  84   scan_relocs(const General_options& options,
  85               Symbol_table* symtab,
  86               Layout* layout,
  87               Sized_relobj<32, false>* object,
  88               unsigned int data_shndx,
  89               unsigned int sh_type,
  90               const unsigned char* prelocs,
  91               size_t reloc_count,
  92               Output_section* output_section,
  93               bool needs_special_offset_handling,
  94               size_t local_symbol_count,
  95               const unsigned char* plocal_symbols);
  96
  97   // Finalize the sections.
  98   void
  99   do_finalize_sections(Layout*);
 100
 101   // Return the value to use for a dynamic which requires special
 102   // treatment.
 103   uint64_t
 104   do_dynsym_value(const Symbol*) const;
 105
 106   // Relocate a section.
 107   void
 108   relocate_section(const Relocate_info<32, false>*,
 109                    unsigned int sh_type,
 110                    const unsigned char* prelocs,
 111                    size_t reloc_count,
 112                    Output_section* output_section,
 113                    bool needs_special_offset_handling,
 114                    unsigned char* view,
 115                    elfcpp::Elf_types<32>::Elf_Addr view_address,
 116                    section_size_type view_size);
 117
 118   // Scan the relocs during a relocatable link.
 119   void
 120   scan_relocatable_relocs(const General_options& options,
 121                           Symbol_table* symtab,
 122                           Layout* layout,
 123                           Sized_relobj<32, false>* object,
 124                           unsigned int data_shndx,
 125                           unsigned int sh_type,
 126                           const unsigned char* prelocs,
 127                           size_t reloc_count,
 128                           Output_section* output_section,
 129                           bool needs_special_offset_handling,
 130                           size_t local_symbol_count,
 131                           const unsigned char* plocal_symbols,
 132                           Relocatable_relocs*);
 133
 134   // Relocate a section during a relocatable link.
 135   void
 136   relocate_for_relocatable(const Relocate_info<32, false>*,
 137                            unsigned int sh_type,
 138                            const unsigned char* prelocs,
 139                            size_t reloc_count,
 140                            Output_section* output_section,
 141                            off_t offset_in_output_section,
 142                            const Relocatable_relocs*,
 143                            unsigned char* view,
 144                            elfcpp::Elf_types<32>::Elf_Addr view_address,
 145                            section_size_type view_size,
 146                            unsigned char* reloc_view,
 147                            section_size_type reloc_view_size);
 148
 149   // Return a string used to fill a code section with nops.
 150   std::string
 151   do_code_fill(section_size_type length) const;
 152
 153   // Return whether SYM is defined by the ABI.
 154   bool
 155   do_is_defined_by_abi(const Symbol* sym) const
 156   { return strcmp(sym->name(), "___tls_get_addr") == 0; }
 157
 158   // Return the size of the GOT section.
 159   section_size_type
 160   got_size()
 161   {
 162     gold_assert(this->got_ != NULL);
 163     return this->got_->data_size();
 164   }
 165
 166  private:
 167   // The class which scans relocations.
 168   struct Scan
 169   {
 170     inline void
 171     local(const General_options& options, Symbol_table* symtab,
 172           Layout* layout, Target_i386* target,
 173           Sized_relobj<32, false>* object,
 174           unsigned int data_shndx,
 175           Output_section* output_section,
 176           const elfcpp::Rel<32, false>& reloc, unsigned int r_type,
 177           const elfcpp::Sym<32, false>& lsym);
 178
 179     inline void
 180     global(const General_options& options, Symbol_table* symtab,
 181            Layout* layout, Target_i386* target,
 182            Sized_relobj<32, false>* object,
 183            unsigned int data_shndx,
 184            Output_section* output_section,
 185            const elfcpp::Rel<32, false>& reloc, unsigned int r_type,
 186            Symbol* gsym);
 187
 188     static void
 189     unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type);
 190
 191     static void
 192     unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type,
 193                              Symbol*);
 194   };
 195
 196   // The class which implements relocation.
 197   class Relocate
 198   {
 199    public:
 200     Relocate()
 201       : skip_call_tls_get_addr_(false),
 202         local_dynamic_type_(LOCAL_DYNAMIC_NONE)
 203     { }
 204
 205     ~Relocate()
 206     {
 207       if (this->skip_call_tls_get_addr_)
 208         {
 209           // FIXME: This needs to specify the location somehow.
 210           gold_error(_("missing expected TLS relocation"));
 211         }
 212     }
 213
 214     // Return whether the static relocation needs to be applied.
 215     inline bool
 216     should_apply_static_reloc(const Sized_symbol<32>* gsym,
 217                               int ref_flags,
 218                               bool is_32bit,
 219                               Output_section* output_section);
 220
 221     // Do a relocation.  Return false if the caller should not issue
 222     // any warnings about this relocation.
 223     inline bool
 224     relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*,
 225              size_t relnum, const elfcpp::Rel<32, false>&,
 226              unsigned int r_type, const Sized_symbol<32>*,
 227              const Symbol_value<32>*,
 228              unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
 229              section_size_type);
 230
 231    private:
 232     // Do a TLS relocation.
 233     inline void
 234     relocate_tls(const Relocate_info<32, false>*, Target_i386* target,
 235                  size_t relnum, const elfcpp::Rel<32, false>&,
 236                  unsigned int r_type, const Sized_symbol<32>*,
 237                  const Symbol_value<32>*,
 238                  unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
 239                  section_size_type);
 240
 241     // Do a TLS General-Dynamic to Initial-Exec transition.
 242     inline void
 243     tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum,
 244                  Output_segment* tls_segment,
 245                  const elfcpp::Rel<32, false>&, unsigned int r_type,
 246                  elfcpp::Elf_types<32>::Elf_Addr value,
 247                  unsigned char* view,
 248                  section_size_type view_size);
 249
 250     // Do a TLS General-Dynamic to Local-Exec transition.
 251     inline void
 252     tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum,
 253                  Output_segment* tls_segment,
 254                  const elfcpp::Rel<32, false>&, unsigned int r_type,
 255                  elfcpp::Elf_types<32>::Elf_Addr value,
 256                  unsigned char* view,
 257                  section_size_type view_size);
 258
 259     // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec
 260     // transition.
 261     inline void
 262     tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum,
 263                       Output_segment* tls_segment,
 264                       const elfcpp::Rel<32, false>&, unsigned int r_type,
 265                       elfcpp::Elf_types<32>::Elf_Addr value,
 266                       unsigned char* view,
 267                       section_size_type view_size);
 268
 269     // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec
 270     // transition.
 271     inline void
 272     tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum,
 273                       Output_segment* tls_segment,
 274                       const elfcpp::Rel<32, false>&, unsigned int r_type,
 275                       elfcpp::Elf_types<32>::Elf_Addr value,
 276                       unsigned char* view,
 277                       section_size_type view_size);
 278
 279     // Do a TLS Local-Dynamic to Local-Exec transition.
 280     inline void
 281     tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum,
 282                  Output_segment* tls_segment,
 283                  const elfcpp::Rel<32, false>&, unsigned int r_type,
 284                  elfcpp::Elf_types<32>::Elf_Addr value,
 285                  unsigned char* view,
 286                  section_size_type view_size);
 287
 288     // Do a TLS Initial-Exec to Local-Exec transition.
 289     static inline void
 290     tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum,
 291                  Output_segment* tls_segment,
 292                  const elfcpp::Rel<32, false>&, unsigned int r_type,
 293                  elfcpp::Elf_types<32>::Elf_Addr value,
 294                  unsigned char* view,
 295                  section_size_type view_size);
 296
 297     // We need to keep track of which type of local dynamic relocation
 298     // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly.
 299     enum Local_dynamic_type
 300     {
 301       LOCAL_DYNAMIC_NONE,
 302       LOCAL_DYNAMIC_SUN,
 303       LOCAL_DYNAMIC_GNU
 304     };
 305
 306     // This is set if we should skip the next reloc, which should be a
 307     // PLT32 reloc against ___tls_get_addr.
 308     bool skip_call_tls_get_addr_;
 309     // The type of local dynamic relocation we have seen in the section
 310     // being relocated, if any.
 311     Local_dynamic_type local_dynamic_type_;
 312   };
 313
 314   // A class which returns the size required for a relocation type,
 315   // used while scanning relocs during a relocatable link.
 316   class Relocatable_size_for_reloc
 317   {
 318    public:
 319     unsigned int
 320     get_size_for_reloc(unsigned int, Relobj*);
 321   };
 322
 323   // Adjust TLS relocation type based on the options and whether this
 324   // is a local symbol.
 325   static tls::Tls_optimization
 326   optimize_tls_reloc(bool is_final, int r_type);
 327
 328   // Get the GOT section, creating it if necessary.
 329   Output_data_got<32, false>*
 330   got_section(Symbol_table*, Layout*);
 331
 332   // Get the GOT PLT section.
 333   Output_data_space*
 334   got_plt_section() const
 335   {
 336     gold_assert(this->got_plt_ != NULL);
 337     return this->got_plt_;
 338   }
 339
 340   // Create a PLT entry for a global symbol.
 341   void
 342   make_plt_entry(Symbol_table*, Layout*, Symbol*);
 343
 344   // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
 345   void
 346   define_tls_base_symbol(Symbol_table*, Layout*);
 347
 348   // Create a GOT entry for the TLS module index.
 349   unsigned int
 350   got_mod_index_entry(Symbol_table* symtab, Layout* layout,
 351                       Sized_relobj<32, false>* object);
 352
 353   // Get the PLT section.
 354   const Output_data_plt_i386*
 355   plt_section() const
 356   {
 357     gold_assert(this->plt_ != NULL);
 358     return this->plt_;
 359   }
 360
 361   // Get the dynamic reloc section, creating it if necessary.
 362   Reloc_section*
 363   rel_dyn_section(Layout*);
 364
 365   // Return true if the symbol may need a COPY relocation.
 366   // References from an executable object to non-function symbols
 367   // defined in a dynamic object may need a COPY relocation.
 368   bool
 369   may_need_copy_reloc(Symbol* gsym)
 370   {
 371     return (!parameters->options().shared()
 372             && gsym->is_from_dynobj()
 373             && gsym->type() != elfcpp::STT_FUNC);
 374   }
 375
 376   // Add a potential copy relocation.
 377   void
 378   copy_reloc(Symbol_table* symtab, Layout* layout,
 379              Sized_relobj<32, false>* object,
 380              unsigned int shndx, Output_section* output_section,
 381              Symbol* sym, const elfcpp::Rel<32, false>& reloc)
 382   {
 383     this->copy_relocs_.copy_reloc(symtab, layout,
 384                                   symtab->get_sized_symbol<32>(sym),
 385                                   object, shndx, output_section, reloc,
 386                                   this->rel_dyn_section(layout));
 387   }
 388
 389   // Information about this specific target which we pass to the
 390   // general Target structure.
 391   static const Target::Target_info i386_info;
 392
 393   // The types of GOT entries needed for this platform.
 394   enum Got_type
 395   {
 396     GOT_TYPE_STANDARD = 0,      // GOT entry for a regular symbol
 397     GOT_TYPE_TLS_NOFFSET = 1,   // GOT entry for negative TLS offset
 398     GOT_TYPE_TLS_OFFSET = 2,    // GOT entry for positive TLS offset
 399     GOT_TYPE_TLS_PAIR = 3,      // GOT entry for TLS module/offset pair
 400     GOT_TYPE_TLS_DESC = 4       // GOT entry for TLS_DESC pair
 401   };
 402
 403   // The GOT section.
 404   Output_data_got<32, false>* got_;
 405   // The PLT section.
 406   Output_data_plt_i386* plt_;
 407   // The GOT PLT section.
 408   Output_data_space* got_plt_;
 409   // The dynamic reloc section.
 410   Reloc_section* rel_dyn_;
 411   // Relocs saved to avoid a COPY reloc.
 412   Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_;
 413   // Space for variables copied with a COPY reloc.
 414   Output_data_space* dynbss_;
 415   // Offset of the GOT entry for the TLS module index.
 416   unsigned int got_mod_index_offset_;
 417   // True if the _TLS_MODULE_BASE_ symbol has been defined.
 418   bool tls_base_symbol_defined_;
 419 };
 420
 421 const Target::Target_info Target_i386::i386_info =
 422 {
 423   32,                   // size
 424   false,                // is_big_endian
 425   elfcpp::EM_386,       // machine_code
 426   false,                // has_make_symbol
 427   false,                // has_resolve
 428   true,                 // has_code_fill
 429   true,                 // is_default_stack_executable
 430   '\0',                 // wrap_char
 431   "/usr/lib/libc.so.1", // dynamic_linker
 432   0x08048000,           // default_text_segment_address
 433   0x1000,               // abi_pagesize (overridable by -z max-page-size)
 434   0x1000                // common_pagesize (overridable by -z common-page-size)
 435 };
 436
 437 // Get the GOT section, creating it if necessary.
 438
 439 Output_data_got<32, false>*
 440 Target_i386::got_section(Symbol_table* symtab, Layout* layout)
 441 {
 442   if (this->got_ == NULL)
 443     {
 444       gold_assert(symtab != NULL && layout != NULL);
 445
 446       this->got_ = new Output_data_got<32, false>();
 447
 448       Output_section* os;
 449       os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
 450                                            (elfcpp::SHF_ALLOC
 451                                             | elfcpp::SHF_WRITE),
 452                                            this->got_);
 453       os->set_is_relro();
 454
 455       // The old GNU linker creates a .got.plt section.  We just
 456       // create another set of data in the .got section.  Note that we
 457       // always create a PLT if we create a GOT, although the PLT
 458       // might be empty.
 459       this->got_plt_ = new Output_data_space(4, "** GOT PLT");
 460       os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
 461                                            (elfcpp::SHF_ALLOC
 462                                             | elfcpp::SHF_WRITE),
 463                                            this->got_plt_);
 464       os->set_is_relro();
 465
 466       // The first three entries are reserved.
 467       this->got_plt_->set_current_data_size(3 * 4);
 468
 469       // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
 470       symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
 471                                     this->got_plt_,
 472                                     0, 0, elfcpp::STT_OBJECT,
 473                                     elfcpp::STB_LOCAL,
 474                                     elfcpp::STV_HIDDEN, 0,
 475                                     false, false);
 476     }
 477
 478   return this->got_;
 479 }
 480
 481 // Get the dynamic reloc section, creating it if necessary.
 482
 483 Target_i386::Reloc_section*
 484 Target_i386::rel_dyn_section(Layout* layout)
 485 {
 486   if (this->rel_dyn_ == NULL)
 487     {
 488       gold_assert(layout != NULL);
 489       this->rel_dyn_ = new Reloc_section(parameters->options().combreloc());
 490       layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL,
 491                                       elfcpp::SHF_ALLOC, this->rel_dyn_);
 492     }
 493   return this->rel_dyn_;
 494 }
 495
 496 // A class to handle the PLT data.
 497
 498 class Output_data_plt_i386 : public Output_section_data
 499 {
 500  public:
 501   typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
 502
 503   Output_data_plt_i386(Layout*, Output_data_space*);
 504
 505   // Add an entry to the PLT.
 506   void
 507   add_entry(Symbol* gsym);
 508
 509   // Return the .rel.plt section data.
 510   const Reloc_section*
 511   rel_plt() const
 512   { return this->rel_; }
 513
 514  protected:
 515   void
 516   do_adjust_output_section(Output_section* os);
 517
 518   // Write to a map file.
 519   void
 520   do_print_to_mapfile(Mapfile* mapfile) const
 521   { mapfile->print_output_data(this, _("** PLT")); }
 522
 523  private:
 524   // The size of an entry in the PLT.
 525   static const int plt_entry_size = 16;
 526
 527   // The first entry in the PLT for an executable.
 528   static unsigned char exec_first_plt_entry[plt_entry_size];
 529
 530   // The first entry in the PLT for a shared object.
 531   static unsigned char dyn_first_plt_entry[plt_entry_size];
 532
 533   // Other entries in the PLT for an executable.
 534   static unsigned char exec_plt_entry[plt_entry_size];
 535
 536   // Other entries in the PLT for a shared object.
 537   static unsigned char dyn_plt_entry[plt_entry_size];
 538
 539   // Set the final size.
 540   void
 541   set_final_data_size()
 542   { this->set_data_size((this->count_ + 1) * plt_entry_size); }
 543
 544   // Write out the PLT data.
 545   void
 546   do_write(Output_file*);
 547
 548   // The reloc section.
 549   Reloc_section* rel_;
 550   // The .got.plt section.
 551   Output_data_space* got_plt_;
 552   // The number of PLT entries.
 553   unsigned int count_;
 554 };
 555
 556 // Create the PLT section.  The ordinary .got section is an argument,
 557 // since we need to refer to the start.  We also create our own .got
 558 // section just for PLT entries.
 559
 560 Output_data_plt_i386::Output_data_plt_i386(Layout* layout,
 561                                            Output_data_space* got_plt)
 562   : Output_section_data(4), got_plt_(got_plt), count_(0)
 563 {
 564   this->rel_ = new Reloc_section(false);
 565   layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
 566                                   elfcpp::SHF_ALLOC, this->rel_);
 567 }
 568
 569 void
 570 Output_data_plt_i386::do_adjust_output_section(Output_section* os)
 571 {
 572   // UnixWare sets the entsize of .plt to 4, and so does the old GNU
 573   // linker, and so do we.
 574   os->set_entsize(4);
 575 }
 576
 577 // Add an entry to the PLT.
 578
 579 void
 580 Output_data_plt_i386::add_entry(Symbol* gsym)
 581 {
 582   gold_assert(!gsym->has_plt_offset());
 583
 584   // Note that when setting the PLT offset we skip the initial
 585   // reserved PLT entry.
 586   gsym->set_plt_offset((this->count_ + 1) * plt_entry_size);
 587
 588   ++this->count_;
 589
 590   section_offset_type got_offset = this->got_plt_->current_data_size();
 591
 592   // Every PLT entry needs a GOT entry which points back to the PLT
 593   // entry (this will be changed by the dynamic linker, normally
 594   // lazily when the function is called).
 595   this->got_plt_->set_current_data_size(got_offset + 4);
 596
 597   // Every PLT entry needs a reloc.
 598   gsym->set_needs_dynsym_entry();
 599   this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_,
 600                          got_offset);
 601
 602   // Note that we don't need to save the symbol.  The contents of the
 603   // PLT are independent of which symbols are used.  The symbols only
 604   // appear in the relocations.
 605 }
 606
 607 // The first entry in the PLT for an executable.
 608
 609 unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] =
 610 {
 611   0xff, 0x35,   // pushl contents of memory address
 612   0, 0, 0, 0,   // replaced with address of .got + 4
 613   0xff, 0x25,   // jmp indirect
 614   0, 0, 0, 0,   // replaced with address of .got + 8
 615   0, 0, 0, 0    // unused
 616 };
 617
 618 // The first entry in the PLT for a shared object.
 619
 620 unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] =
 621 {
 622   0xff, 0xb3, 4, 0, 0, 0,       // pushl 4(%ebx)
 623   0xff, 0xa3, 8, 0, 0, 0,       // jmp *8(%ebx)
 624   0, 0, 0, 0                    // unused
 625 };
 626
 627 // Subsequent entries in the PLT for an executable.
 628
 629 unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] =
 630 {
 631   0xff, 0x25,   // jmp indirect
 632   0, 0, 0, 0,   // replaced with address of symbol in .got
 633   0x68,         // pushl immediate
 634   0, 0, 0, 0,   // replaced with offset into relocation table
 635   0xe9,         // jmp relative
 636   0, 0, 0, 0    // replaced with offset to start of .plt
 637 };
 638
 639 // Subsequent entries in the PLT for a shared object.
 640
 641 unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] =
 642 {
 643   0xff, 0xa3,   // jmp *offset(%ebx)
 644   0, 0, 0, 0,   // replaced with offset of symbol in .got
 645   0x68,         // pushl immediate
 646   0, 0, 0, 0,   // replaced with offset into relocation table
 647   0xe9,         // jmp relative
 648   0, 0, 0, 0    // replaced with offset to start of .plt
 649 };
 650
 651 // Write out the PLT.  This uses the hand-coded instructions above,
 652 // and adjusts them as needed.  This is all specified by the i386 ELF
 653 // Processor Supplement.
 654
 655 void
 656 Output_data_plt_i386::do_write(Output_file* of)
 657 {
 658   const off_t offset = this->offset();
 659   const section_size_type oview_size =
 660     convert_to_section_size_type(this->data_size());
 661   unsigned char* const oview = of->get_output_view(offset, oview_size);
 662
 663   const off_t got_file_offset = this->got_plt_->offset();
 664   const section_size_type got_size =
 665     convert_to_section_size_type(this->got_plt_->data_size());
 666   unsigned char* const got_view = of->get_output_view(got_file_offset,
 667                                                       got_size);
 668
 669   unsigned char* pov = oview;
 670
 671   elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address();
 672   elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address();
 673
 674   if (parameters->options().shared())
 675     memcpy(pov, dyn_first_plt_entry, plt_entry_size);
 676   else
 677     {
 678       memcpy(pov, exec_first_plt_entry, plt_entry_size);
 679       elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4);
 680       elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8);
 681     }
 682   pov += plt_entry_size;
 683
 684   unsigned char* got_pov = got_view;
 685
 686   memset(got_pov, 0, 12);
 687   got_pov += 12;
 688
 689   const int rel_size = elfcpp::Elf_sizes<32>::rel_size;
 690
 691   unsigned int plt_offset = plt_entry_size;
 692   unsigned int plt_rel_offset = 0;
 693   unsigned int got_offset = 12;
 694   const unsigned int count = this->count_;
 695   for (unsigned int i = 0;
 696        i < count;
 697        ++i,
 698          pov += plt_entry_size,
 699          got_pov += 4,
 700          plt_offset += plt_entry_size,
 701          plt_rel_offset += rel_size,
 702          got_offset += 4)
 703     {
 704       // Set and adjust the PLT entry itself.
 705
 706       if (parameters->options().shared())
 707         {
 708           memcpy(pov, dyn_plt_entry, plt_entry_size);
 709           elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset);
 710         }
 711       else
 712         {
 713           memcpy(pov, exec_plt_entry, plt_entry_size);
 714           elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
 715                                                       (got_address
 716                                                        + got_offset));
 717         }
 718
 719       elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset);
 720       elfcpp::Swap<32, false>::writeval(pov + 12,
 721                                         - (plt_offset + plt_entry_size));
 722
 723       // Set the entry in the GOT.
 724       elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6);
 725     }
 726
 727   gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
 728   gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
 729
 730   of->write_output_view(offset, oview_size, oview);
 731   of->write_output_view(got_file_offset, got_size, got_view);
 732 }
 733
 734 // Create a PLT entry for a global symbol.
 735
 736 void
 737 Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym)
 738 {
 739   if (gsym->has_plt_offset())
 740     return;
 741
 742   if (this->plt_ == NULL)
 743     {
 744       // Create the GOT sections first.
 745       this->got_section(symtab, layout);
 746
 747       this->plt_ = new Output_data_plt_i386(layout, this->got_plt_);
 748       layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
 749                                       (elfcpp::SHF_ALLOC
 750                                        | elfcpp::SHF_EXECINSTR),
 751                                       this->plt_);
 752     }
 753
 754   this->plt_->add_entry(gsym);
 755 }
 756
 757 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
 758
 759 void
 760 Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout)
 761 {
 762   if (this->tls_base_symbol_defined_)
 763     return;
 764
 765   Output_segment* tls_segment = layout->tls_segment();
 766   if (tls_segment != NULL)
 767     {
 768       bool is_exec = parameters->options().output_is_executable();
 769       symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
 770                                        tls_segment, 0, 0,
 771                                        elfcpp::STT_TLS,
 772                                        elfcpp::STB_LOCAL,
 773                                        elfcpp::STV_HIDDEN, 0,
 774                                        (is_exec
 775                                         ? Symbol::SEGMENT_END
 776                                         : Symbol::SEGMENT_START),
 777                                        true);
 778     }
 779   this->tls_base_symbol_defined_ = true;
 780 }
 781
 782 // Create a GOT entry for the TLS module index.
 783
 784 unsigned int
 785 Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
 786                                  Sized_relobj<32, false>* object)
 787 {
 788   if (this->got_mod_index_offset_ == -1U)
 789     {
 790       gold_assert(symtab != NULL && layout != NULL && object != NULL);
 791       Reloc_section* rel_dyn = this->rel_dyn_section(layout);
 792       Output_data_got<32, false>* got = this->got_section(symtab, layout);
 793       unsigned int got_offset = got->add_constant(0);
 794       rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got,
 795                          got_offset);
 796       got->add_constant(0);
 797       this->got_mod_index_offset_ = got_offset;
 798     }
 799   return this->got_mod_index_offset_;
 800 }
 801
 802 // Optimize the TLS relocation type based on what we know about the
 803 // symbol.  IS_FINAL is true if the final address of this symbol is
 804 // known at link time.
 805
 806 tls::Tls_optimization
 807 Target_i386::optimize_tls_reloc(bool is_final, int r_type)
 808 {
 809   // If we are generating a shared library, then we can't do anything
 810   // in the linker.
 811   if (parameters->options().shared())
 812     return tls::TLSOPT_NONE;
 813
 814   switch (r_type)
 815     {
 816     case elfcpp::R_386_TLS_GD:
 817     case elfcpp::R_386_TLS_GOTDESC:
 818     case elfcpp::R_386_TLS_DESC_CALL:
 819       // These are General-Dynamic which permits fully general TLS
 820       // access.  Since we know that we are generating an executable,
 821       // we can convert this to Initial-Exec.  If we also know that
 822       // this is a local symbol, we can further switch to Local-Exec.
 823       if (is_final)
 824         return tls::TLSOPT_TO_LE;
 825       return tls::TLSOPT_TO_IE;
 826
 827     case elfcpp::R_386_TLS_LDM:
 828       // This is Local-Dynamic, which refers to a local symbol in the
 829       // dynamic TLS block.  Since we know that we generating an
 830       // executable, we can switch to Local-Exec.
 831       return tls::TLSOPT_TO_LE;
 832
 833     case elfcpp::R_386_TLS_LDO_32:
 834       // Another type of Local-Dynamic relocation.
 835       return tls::TLSOPT_TO_LE;
 836
 837     case elfcpp::R_386_TLS_IE:
 838     case elfcpp::R_386_TLS_GOTIE:
 839     case elfcpp::R_386_TLS_IE_32:
 840       // These are Initial-Exec relocs which get the thread offset
 841       // from the GOT.  If we know that we are linking against the
 842       // local symbol, we can switch to Local-Exec, which links the
 843       // thread offset into the instruction.
 844       if (is_final)
 845         return tls::TLSOPT_TO_LE;
 846       return tls::TLSOPT_NONE;
 847
 848     case elfcpp::R_386_TLS_LE:
 849     case elfcpp::R_386_TLS_LE_32:
 850       // When we already have Local-Exec, there is nothing further we
 851       // can do.
 852       return tls::TLSOPT_NONE;
 853
 854     default:
 855       gold_unreachable();
 856     }
 857 }
 858
 859 // Report an unsupported relocation against a local symbol.
 860
 861 void
 862 Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object,
 863                                            unsigned int r_type)
 864 {
 865   gold_error(_("%s: unsupported reloc %u against local symbol"),
 866              object->name().c_str(), r_type);
 867 }
 868
 869 // Scan a relocation for a local symbol.
 870
 871 inline void
 872 Target_i386::Scan::local(const General_options&,
 873                          Symbol_table* symtab,
 874                          Layout* layout,
 875                          Target_i386* target,
 876                          Sized_relobj<32, false>* object,
 877                          unsigned int data_shndx,
 878                          Output_section* output_section,
 879                          const elfcpp::Rel<32, false>& reloc,
 880                          unsigned int r_type,
 881                          const elfcpp::Sym<32, false>& lsym)
 882 {
 883   switch (r_type)
 884     {
 885     case elfcpp::R_386_NONE:
 886     case elfcpp::R_386_GNU_VTINHERIT:
 887     case elfcpp::R_386_GNU_VTENTRY:
 888       break;
 889
 890     case elfcpp::R_386_32:
 891       // If building a shared library (or a position-independent
 892       // executable), we need to create a dynamic relocation for
 893       // this location. The relocation applied at link time will
 894       // apply the link-time value, so we flag the location with
 895       // an R_386_RELATIVE relocation so the dynamic loader can
 896       // relocate it easily.
 897       if (parameters->options().output_is_position_independent())
 898         {
 899           Reloc_section* rel_dyn = target->rel_dyn_section(layout);
 900           unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
 901           rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE,
 902                                       output_section, data_shndx,
 903                                       reloc.get_r_offset());
 904         }
 905       break;
 906
 907     case elfcpp::R_386_16:
 908     case elfcpp::R_386_8:
 909       // If building a shared library (or a position-independent
 910       // executable), we need to create a dynamic relocation for
 911       // this location. Because the addend needs to remain in the
 912       // data section, we need to be careful not to apply this
 913       // relocation statically.
 914       if (parameters->options().output_is_position_independent())
 915         {
 916           Reloc_section* rel_dyn = target->rel_dyn_section(layout);
 917           unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
 918           if (lsym.get_st_type() != elfcpp::STT_SECTION)
 919             rel_dyn->add_local(object, r_sym, r_type, output_section,
 920                                data_shndx, reloc.get_r_offset());
 921           else
 922             {
 923               gold_assert(lsym.get_st_value() == 0);
 924               unsigned int shndx = lsym.get_st_shndx();
 925               bool is_ordinary;
 926               shndx = object->adjust_sym_shndx(r_sym, shndx,
 927                                                &is_ordinary);
 928               if (!is_ordinary)
 929                 object->error(_("section symbol %u has bad shndx %u"),
 930                               r_sym, shndx);
 931               else
 932                 rel_dyn->add_local_section(object, shndx,
 933                                            r_type, output_section,
 934                                            data_shndx, reloc.get_r_offset());
 935             }
 936         }
 937       break;
 938
 939     case elfcpp::R_386_PC32:
 940     case elfcpp::R_386_PC16:
 941     case elfcpp::R_386_PC8:
 942       break;
 943
 944     case elfcpp::R_386_PLT32:
 945       // Since we know this is a local symbol, we can handle this as a
 946       // PC32 reloc.
 947       break;
 948
 949     case elfcpp::R_386_GOTOFF:
 950     case elfcpp::R_386_GOTPC:
 951       // We need a GOT section.
 952       target->got_section(symtab, layout);
 953       break;
 954
 955     case elfcpp::R_386_GOT32:
 956       {
 957         // The symbol requires a GOT entry.
 958         Output_data_got<32, false>* got = target->got_section(symtab, layout);
 959         unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
 960         if (got->add_local(object, r_sym, GOT_TYPE_STANDARD))
 961           {
 962             // If we are generating a shared object, we need to add a
 963             // dynamic RELATIVE relocation for this symbol's GOT entry.
 964             if (parameters->options().output_is_position_independent())
 965               {
 966                 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
 967                 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
 968                 rel_dyn->add_local_relative(
 969                     object, r_sym, elfcpp::R_386_RELATIVE, got,
 970                     object->local_got_offset(r_sym, GOT_TYPE_STANDARD));
 971               }
 972           }
 973       }
 974       break;
 975
 976       // These are relocations which should only be seen by the
 977       // dynamic linker, and should never be seen here.
 978     case elfcpp::R_386_COPY:
 979     case elfcpp::R_386_GLOB_DAT:
 980     case elfcpp::R_386_JUMP_SLOT:
 981     case elfcpp::R_386_RELATIVE:
 982     case elfcpp::R_386_TLS_TPOFF:
 983     case elfcpp::R_386_TLS_DTPMOD32:
 984     case elfcpp::R_386_TLS_DTPOFF32:
 985     case elfcpp::R_386_TLS_TPOFF32:
 986     case elfcpp::R_386_TLS_DESC:
 987       gold_error(_("%s: unexpected reloc %u in object file"),
 988                  object->name().c_str(), r_type);
 989       break;
 990
 991       // These are initial TLS relocs, which are expected when
 992       // linking.
 993     case elfcpp::R_386_TLS_GD:            // Global-dynamic
 994     case elfcpp::R_386_TLS_GOTDESC:       // Global-dynamic (from ~oliva url)
 995     case elfcpp::R_386_TLS_DESC_CALL:
 996     case elfcpp::R_386_TLS_LDM:           // Local-dynamic
 997     case elfcpp::R_386_TLS_LDO_32:        // Alternate local-dynamic
 998     case elfcpp::R_386_TLS_IE:            // Initial-exec
 999     case elfcpp::R_386_TLS_IE_32:
1000     case elfcpp::R_386_TLS_GOTIE:
1001     case elfcpp::R_386_TLS_LE:            // Local-exec
1002     case elfcpp::R_386_TLS_LE_32:
1003       {
1004         bool output_is_shared = parameters->options().shared();
1005         const tls::Tls_optimization optimized_type
1006             = Target_i386::optimize_tls_reloc(!output_is_shared, r_type);
1007         switch (r_type)
1008           {
1009           case elfcpp::R_386_TLS_GD:          // Global-dynamic
1010             if (optimized_type == tls::TLSOPT_NONE)
1011               {
1012                 // Create a pair of GOT entries for the module index and
1013                 // dtv-relative offset.
1014                 Output_data_got<32, false>* got
1015                     = target->got_section(symtab, layout);
1016                 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
1017                 unsigned int shndx = lsym.get_st_shndx();
1018                 bool is_ordinary;
1019                 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
1020                 if (!is_ordinary)
1021                   object->error(_("local symbol %u has bad shndx %u"),
1022                               r_sym, shndx);
1023                 else
1024                   got->add_local_pair_with_rel(object, r_sym, shndx,
1025                                                GOT_TYPE_TLS_PAIR,
1026                                                target->rel_dyn_section(layout),
1027                                                elfcpp::R_386_TLS_DTPMOD32, 0);
1028               }
1029             else if (optimized_type != tls::TLSOPT_TO_LE)
1030               unsupported_reloc_local(object, r_type);
1031             break;
1032
1033           case elfcpp::R_386_TLS_GOTDESC:     // Global-dynamic (from ~oliva)
1034             target->define_tls_base_symbol(symtab, layout);
1035             if (optimized_type == tls::TLSOPT_NONE)
1036               {
1037                 // Create a double GOT entry with an R_386_TLS_DESC reloc.
1038                 Output_data_got<32, false>* got
1039                     = target->got_section(symtab, layout);
1040                 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
1041                 unsigned int shndx = lsym.get_st_shndx();
1042                 bool is_ordinary;
1043                 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
1044                 if (!is_ordinary)
1045                   object->error(_("local symbol %u has bad shndx %u"),
1046                               r_sym, shndx);
1047                 else
1048                   got->add_local_pair_with_rel(object, r_sym, shndx,
1049                                                GOT_TYPE_TLS_DESC,
1050                                                target->rel_dyn_section(layout),
1051                                                elfcpp::R_386_TLS_DESC, 0);
1052               }
1053             else if (optimized_type != tls::TLSOPT_TO_LE)
1054               unsupported_reloc_local(object, r_type);
1055             break;
1056
1057           case elfcpp::R_386_TLS_DESC_CALL:
1058             break;
1059
1060           case elfcpp::R_386_TLS_LDM:         // Local-dynamic
1061             if (optimized_type == tls::TLSOPT_NONE)
1062               {
1063                 // Create a GOT entry for the module index.
1064                 target->got_mod_index_entry(symtab, layout, object);
1065               }
1066             else if (optimized_type != tls::TLSOPT_TO_LE)
1067               unsupported_reloc_local(object, r_type);
1068             break;
1069
1070           case elfcpp::R_386_TLS_LDO_32:      // Alternate local-dynamic
1071             break;
1072
1073           case elfcpp::R_386_TLS_IE:          // Initial-exec
1074           case elfcpp::R_386_TLS_IE_32:
1075           case elfcpp::R_386_TLS_GOTIE:
1076             layout->set_has_static_tls();
1077             if (optimized_type == tls::TLSOPT_NONE)
1078               {
1079                 // For the R_386_TLS_IE relocation, we need to create a
1080                 // dynamic relocation when building a shared library.
1081                 if (r_type == elfcpp::R_386_TLS_IE
1082                     && parameters->options().shared())
1083                   {
1084                     Reloc_section* rel_dyn = target->rel_dyn_section(layout);
1085                     unsigned int r_sym
1086                         = elfcpp::elf_r_sym<32>(reloc.get_r_info());
1087                     rel_dyn->add_local_relative(object, r_sym,
1088                                                 elfcpp::R_386_RELATIVE,
1089                                                 output_section, data_shndx,
1090                                                 reloc.get_r_offset());
1091                   }
1092                 // Create a GOT entry for the tp-relative offset.
1093                 Output_data_got<32, false>* got
1094                     = target->got_section(symtab, layout);
1095                 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
1096                 unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32
1097                                            ? elfcpp::R_386_TLS_TPOFF32
1098                                            : elfcpp::R_386_TLS_TPOFF);
1099                 unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32
1100                                          ? GOT_TYPE_TLS_OFFSET
1101                                          : GOT_TYPE_TLS_NOFFSET);
1102                 got->add_local_with_rel(object, r_sym, got_type,
1103                                         target->rel_dyn_section(layout),
1104                                         dyn_r_type);
1105               }
1106             else if (optimized_type != tls::TLSOPT_TO_LE)
1107               unsupported_reloc_local(object, r_type);
1108             break;
1109
1110           case elfcpp::R_386_TLS_LE:          // Local-exec
1111           case elfcpp::R_386_TLS_LE_32:
1112             layout->set_has_static_tls();
1113             if (output_is_shared)
1114               {
1115                 // We need to create a dynamic relocation.
1116                 gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
1117                 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
1118                 unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32
1119                                            ? elfcpp::R_386_TLS_TPOFF32
1120                                            : elfcpp::R_386_TLS_TPOFF);
1121                 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
1122                 rel_dyn->add_local(object, r_sym, dyn_r_type, output_section,
1123                                    data_shndx, reloc.get_r_offset());
1124               }
1125             break;
1126
1127           default:
1128             gold_unreachable();
1129           }
1130       }
1131       break;
1132
1133     case elfcpp::R_386_32PLT:
1134     case elfcpp::R_386_TLS_GD_32:
1135     case elfcpp::R_386_TLS_GD_PUSH:
1136     case elfcpp::R_386_TLS_GD_CALL:
1137     case elfcpp::R_386_TLS_GD_POP:
1138     case elfcpp::R_386_TLS_LDM_32:
1139     case elfcpp::R_386_TLS_LDM_PUSH:
1140     case elfcpp::R_386_TLS_LDM_CALL:
1141     case elfcpp::R_386_TLS_LDM_POP:
1142     case elfcpp::R_386_USED_BY_INTEL_200:
1143     default:
1144       unsupported_reloc_local(object, r_type);
1145       break;
1146     }
1147 }
1148
1149 // Report an unsupported relocation against a global symbol.
1150
1151 void
1152 Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object,
1153                                             unsigned int r_type,
1154                                             Symbol* gsym)
1155 {
1156   gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1157              object->name().c_str(), r_type, gsym->demangled_name().c_str());
1158 }
1159
1160 // Scan a relocation for a global symbol.
1161
1162 inline void
1163 Target_i386::Scan::global(const General_options&,
1164                           Symbol_table* symtab,
1165                           Layout* layout,
1166                           Target_i386* target,
1167                           Sized_relobj<32, false>* object,
1168                           unsigned int data_shndx,
1169                           Output_section* output_section,
1170                           const elfcpp::Rel<32, false>& reloc,
1171                           unsigned int r_type,
1172                           Symbol* gsym)
1173 {
1174   switch (r_type)
1175     {
1176     case elfcpp::R_386_NONE:
1177     case elfcpp::R_386_GNU_VTINHERIT:
1178     case elfcpp::R_386_GNU_VTENTRY:
1179       break;
1180
1181     case elfcpp::R_386_32:
1182     case elfcpp::R_386_16:
1183     case elfcpp::R_386_8:
1184       {
1185         // Make a PLT entry if necessary.
1186         if (gsym->needs_plt_entry())
1187           {
1188             target->make_plt_entry(symtab, layout, gsym);
1189             // Since this is not a PC-relative relocation, we may be
1190             // taking the address of a function. In that case we need to
1191             // set the entry in the dynamic symbol table to the address of
1192             // the PLT entry.
1193             if (gsym->is_from_dynobj() && !parameters->options().shared())
1194               gsym->set_needs_dynsym_value();
1195           }
1196         // Make a dynamic relocation if necessary.
1197         if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF))
1198           {
1199             if (target->may_need_copy_reloc(gsym))
1200               {
1201                 target->copy_reloc(symtab, layout, object,
1202                                    data_shndx, output_section, gsym, reloc);
1203               }
1204             else if (r_type == elfcpp::R_386_32
1205                      && gsym->can_use_relative_reloc(false))
1206               {
1207                 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
1208                 rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE,
1209                                              output_section, object,
1210                                              data_shndx, reloc.get_r_offset());
1211               }
1212             else
1213               {
1214                 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
1215                 rel_dyn->add_global(gsym, r_type, output_section, object,
1216                                     data_shndx, reloc.get_r_offset());
1217               }
1218           }
1219       }
1220       break;
1221
1222     case elfcpp::R_386_PC32:
1223     case elfcpp::R_386_PC16:
1224     case elfcpp::R_386_PC8:
1225       {
1226         // Make a PLT entry if necessary.
1227         if (gsym->needs_plt_entry())
1228           {
1229             // These relocations are used for function calls only in
1230             // non-PIC code.  For a 32-bit relocation in a shared library,
1231             // we'll need a text relocation anyway, so we can skip the
1232             // PLT entry and let the dynamic linker bind the call directly
1233             // to the target.  For smaller relocations, we should use a
1234             // PLT entry to ensure that the call can reach.
1235             if (!parameters->options().shared()
1236                 || r_type != elfcpp::R_386_PC32)
1237               target->make_plt_entry(symtab, layout, gsym);
1238           }
1239         // Make a dynamic relocation if necessary.
1240         int flags = Symbol::NON_PIC_REF;
1241         if (gsym->type() == elfcpp::STT_FUNC)
1242           flags |= Symbol::FUNCTION_CALL;
1243         if (gsym->needs_dynamic_reloc(flags))
1244           {
1245             if (target->may_need_copy_reloc(gsym))
1246               {
1247                 target->copy_reloc(symtab, layout, object,
1248                                    data_shndx, output_section, gsym, reloc);
1249               }
1250             else
1251               {
1252                 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
1253                 rel_dyn->add_global(gsym, r_type, output_section, object,
1254                                     data_shndx, reloc.get_r_offset());
1255               }
1256           }
1257       }
1258       break;
1259
1260     case elfcpp::R_386_GOT32:
1261       {
1262         // The symbol requires a GOT entry.
1263         Output_data_got<32, false>* got = target->got_section(symtab, layout);
1264         if (gsym->final_value_is_known())
1265           got->add_global(gsym, GOT_TYPE_STANDARD);
1266         else
1267           {
1268             // If this symbol is not fully resolved, we need to add a
1269             // GOT entry with a dynamic relocation.
1270             Reloc_section* rel_dyn = target->rel_dyn_section(layout);
1271             if (gsym->is_from_dynobj()
1272                 || gsym->is_undefined()
1273                 || gsym->is_preemptible())
1274               got->add_global_with_rel(gsym, GOT_TYPE_STANDARD,
1275                                        rel_dyn, elfcpp::R_386_GLOB_DAT);
1276             else
1277               {
1278                 if (got->add_global(gsym, GOT_TYPE_STANDARD))
1279                   rel_dyn->add_global_relative(
1280                       gsym, elfcpp::R_386_RELATIVE, got,
1281                       gsym->got_offset(GOT_TYPE_STANDARD));
1282               }
1283           }
1284       }
1285       break;
1286
1287     case elfcpp::R_386_PLT32:
1288       // If the symbol is fully resolved, this is just a PC32 reloc.
1289       // Otherwise we need a PLT entry.
1290       if (gsym->final_value_is_known())
1291         break;
1292       // If building a shared library, we can also skip the PLT entry
1293       // if the symbol is defined in the output file and is protected
1294       // or hidden.
1295       if (gsym->is_defined()
1296           && !gsym->is_from_dynobj()
1297           && !gsym->is_preemptible())
1298         break;
1299       target->make_plt_entry(symtab, layout, gsym);
1300       break;
1301
1302     case elfcpp::R_386_GOTOFF:
1303     case elfcpp::R_386_GOTPC:
1304       // We need a GOT section.
1305       target->got_section(symtab, layout);
1306       break;
1307
1308       // These are relocations which should only be seen by the
1309       // dynamic linker, and should never be seen here.
1310     case elfcpp::R_386_COPY:
1311     case elfcpp::R_386_GLOB_DAT:
1312     case elfcpp::R_386_JUMP_SLOT:
1313     case elfcpp::R_386_RELATIVE:
1314     case elfcpp::R_386_TLS_TPOFF:
1315     case elfcpp::R_386_TLS_DTPMOD32:
1316     case elfcpp::R_386_TLS_DTPOFF32:
1317     case elfcpp::R_386_TLS_TPOFF32:
1318     case elfcpp::R_386_TLS_DESC:
1319       gold_error(_("%s: unexpected reloc %u in object file"),
1320                  object->name().c_str(), r_type);
1321       break;
1322
1323       // These are initial tls relocs, which are expected when
1324       // linking.
1325     case elfcpp::R_386_TLS_GD:            // Global-dynamic
1326     case elfcpp::R_386_TLS_GOTDESC:       // Global-dynamic (from ~oliva url)
1327     case elfcpp::R_386_TLS_DESC_CALL:
1328     case elfcpp::R_386_TLS_LDM:           // Local-dynamic
1329     case elfcpp::R_386_TLS_LDO_32:        // Alternate local-dynamic
1330     case elfcpp::R_386_TLS_IE:            // Initial-exec
1331     case elfcpp::R_386_TLS_IE_32:
1332     case elfcpp::R_386_TLS_GOTIE:
1333     case elfcpp::R_386_TLS_LE:            // Local-exec
1334     case elfcpp::R_386_TLS_LE_32:
1335       {
1336         const bool is_final = gsym->final_value_is_known();
1337         const tls::Tls_optimization optimized_type
1338             = Target_i386::optimize_tls_reloc(is_final, r_type);
1339         switch (r_type)
1340           {
1341           case elfcpp::R_386_TLS_GD:          // Global-dynamic
1342             if (optimized_type == tls::TLSOPT_NONE)
1343               {
1344                 // Create a pair of GOT entries for the module index and
1345                 // dtv-relative offset.
1346                 Output_data_got<32, false>* got
1347                     = target->got_section(symtab, layout);
1348                 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
1349                                              target->rel_dyn_section(layout),
1350                                              elfcpp::R_386_TLS_DTPMOD32,
1351                                              elfcpp::R_386_TLS_DTPOFF32);
1352               }
1353             else if (optimized_type == tls::TLSOPT_TO_IE)
1354               {
1355                 // Create a GOT entry for the tp-relative offset.
1356                 Output_data_got<32, false>* got
1357                     = target->got_section(symtab, layout);
1358                 got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET,
1359                                          target->rel_dyn_section(layout),
1360                                          elfcpp::R_386_TLS_TPOFF);
1361               }
1362             else if (optimized_type != tls::TLSOPT_TO_LE)
1363               unsupported_reloc_global(object, r_type, gsym);
1364             break;
1365
1366           case elfcpp::R_386_TLS_GOTDESC:     // Global-dynamic (~oliva url)
1367             target->define_tls_base_symbol(symtab, layout);
1368             if (optimized_type == tls::TLSOPT_NONE)
1369               {
1370                 // Create a double GOT entry with an R_386_TLS_DESC reloc.
1371                 Output_data_got<32, false>* got
1372                     = target->got_section(symtab, layout);
1373                 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC,
1374                                              target->rel_dyn_section(layout),
1375                                              elfcpp::R_386_TLS_DESC, 0);
1376               }
1377             else if (optimized_type == tls::TLSOPT_TO_IE)
1378               {
1379                 // Create a GOT entry for the tp-relative offset.
1380                 Output_data_got<32, false>* got
1381                     = target->got_section(symtab, layout);
1382                 got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET,
1383                                          target->rel_dyn_section(layout),
1384                                          elfcpp::R_386_TLS_TPOFF);
1385               }
1386             else if (optimized_type != tls::TLSOPT_TO_LE)
1387               unsupported_reloc_global(object, r_type, gsym);
1388             break;
1389
1390           case elfcpp::R_386_TLS_DESC_CALL:
1391             break;
1392
1393           case elfcpp::R_386_TLS_LDM:         // Local-dynamic
1394             if (optimized_type == tls::TLSOPT_NONE)
1395               {
1396                 // Create a GOT entry for the module index.
1397                 target->got_mod_index_entry(symtab, layout, object);
1398               }
1399             else if (optimized_type != tls::TLSOPT_TO_LE)
1400               unsupported_reloc_global(object, r_type, gsym);
1401             break;
1402
1403           case elfcpp::R_386_TLS_LDO_32:      // Alternate local-dynamic
1404             break;
1405
1406           case elfcpp::R_386_TLS_IE:          // Initial-exec
1407           case elfcpp::R_386_TLS_IE_32:
1408           case elfcpp::R_386_TLS_GOTIE:
1409             layout->set_has_static_tls();
1410             if (optimized_type == tls::TLSOPT_NONE)
1411               {
1412                 // For the R_386_TLS_IE relocation, we need to create a
1413                 // dynamic relocation when building a shared library.
1414                 if (r_type == elfcpp::R_386_TLS_IE
1415                     && parameters->options().shared())
1416                   {
1417                     Reloc_section* rel_dyn = target->rel_dyn_section(layout);
1418                     rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE,
1419                                                  output_section, object,
1420                                                  data_shndx,
1421                                                  reloc.get_r_offset());
1422                   }
1423                 // Create a GOT entry for the tp-relative offset.
1424                 Output_data_got<32, false>* got
1425                     = target->got_section(symtab, layout);
1426                 unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32
1427                                            ? elfcpp::R_386_TLS_TPOFF32
1428                                            : elfcpp::R_386_TLS_TPOFF);
1429                 unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32
1430                                          ? GOT_TYPE_TLS_OFFSET
1431                                          : GOT_TYPE_TLS_NOFFSET);
1432                 got->add_global_with_rel(gsym, got_type,
1433                                          target->rel_dyn_section(layout),
1434                                          dyn_r_type);
1435               }
1436             else if (optimized_type != tls::TLSOPT_TO_LE)
1437               unsupported_reloc_global(object, r_type, gsym);
1438             break;
1439
1440           case elfcpp::R_386_TLS_LE:          // Local-exec
1441           case elfcpp::R_386_TLS_LE_32:
1442             layout->set_has_static_tls();
1443             if (parameters->options().shared())
1444               {
1445                 // We need to create a dynamic relocation.
1446                 unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32
1447                                            ? elfcpp::R_386_TLS_TPOFF32
1448                                            : elfcpp::R_386_TLS_TPOFF);
1449                 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
1450                 rel_dyn->add_global(gsym, dyn_r_type, output_section, object,
1451                                     data_shndx, reloc.get_r_offset());
1452               }
1453             break;
1454
1455           default:
1456             gold_unreachable();
1457           }
1458       }
1459       break;
1460
1461     case elfcpp::R_386_32PLT:
1462     case elfcpp::R_386_TLS_GD_32:
1463     case elfcpp::R_386_TLS_GD_PUSH:
1464     case elfcpp::R_386_TLS_GD_CALL:
1465     case elfcpp::R_386_TLS_GD_POP:
1466     case elfcpp::R_386_TLS_LDM_32:
1467     case elfcpp::R_386_TLS_LDM_PUSH:
1468     case elfcpp::R_386_TLS_LDM_CALL:
1469     case elfcpp::R_386_TLS_LDM_POP:
1470     case elfcpp::R_386_USED_BY_INTEL_200:
1471     default:
1472       unsupported_reloc_global(object, r_type, gsym);
1473       break;
1474     }
1475 }
1476
1477 // Process relocations for gc.
1478
1479 void
1480 Target_i386::gc_process_relocs(const General_options& options,
1481                                Symbol_table* symtab,
1482                                Layout* layout,
1483                                Sized_relobj<32, false>* object,
1484                                unsigned int data_shndx,
1485                                unsigned int,
1486                                const unsigned char* prelocs,
1487                                size_t reloc_count,
1488                                Output_section* output_section,
1489                                bool needs_special_offset_handling,
1490                                size_t local_symbol_count,
1491                                const unsigned char* plocal_symbols)
1492 {
1493   gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL,
1494                           Target_i386::Scan>(
1495     options,
1496     symtab,
1497     layout,
1498     this,
1499     object,
1500     data_shndx,
1501     prelocs,
1502     reloc_count,
1503     output_section,
1504     needs_special_offset_handling,
1505     local_symbol_count,
1506     plocal_symbols);
1507 }
1508
1509 // Scan relocations for a section.
1510
1511 void
1512 Target_i386::scan_relocs(const General_options& options,
1513                          Symbol_table* symtab,
1514                          Layout* layout,
1515                          Sized_relobj<32, false>* object,
1516                          unsigned int data_shndx,
1517                          unsigned int sh_type,
1518                          const unsigned char* prelocs,
1519                          size_t reloc_count,
1520                          Output_section* output_section,
1521                          bool needs_special_offset_handling,
1522                          size_t local_symbol_count,
1523                          const unsigned char* plocal_symbols)
1524 {
1525   if (sh_type == elfcpp::SHT_RELA)
1526     {
1527       gold_error(_("%s: unsupported RELA reloc section"),
1528                  object->name().c_str());
1529       return;
1530     }
1531
1532   gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL,
1533                     Target_i386::Scan>(
1534     options,
1535     symtab,
1536     layout,
1537     this,
1538     object,
1539     data_shndx,
1540     prelocs,
1541     reloc_count,
1542     output_section,
1543     needs_special_offset_handling,
1544     local_symbol_count,
1545     plocal_symbols);
1546 }
1547
1548 // Finalize the sections.
1549
1550 void
1551 Target_i386::do_finalize_sections(Layout* layout)
1552 {
1553   // Fill in some more dynamic tags.
1554   Output_data_dynamic* const odyn = layout->dynamic_data();
1555   if (odyn != NULL)
1556     {
1557       if (this->got_plt_ != NULL)
1558         odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_);
1559
1560       if (this->plt_ != NULL)
1561         {
1562           const Output_data* od = this->plt_->rel_plt();
1563           odyn->add_section_size(elfcpp::DT_PLTRELSZ, od);
1564           odyn->add_section_address(elfcpp::DT_JMPREL, od);
1565           odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL);
1566         }
1567
1568       if (this->rel_dyn_ != NULL)
1569         {
1570           const Output_data* od = this->rel_dyn_;
1571           odyn->add_section_address(elfcpp::DT_REL, od);
1572           odyn->add_section_size(elfcpp::DT_RELSZ, od);
1573           odyn->add_constant(elfcpp::DT_RELENT,
1574                              elfcpp::Elf_sizes<32>::rel_size);
1575         }
1576
1577       if (!parameters->options().shared())
1578         {
1579           // The value of the DT_DEBUG tag is filled in by the dynamic
1580           // linker at run time, and used by the debugger.
1581           odyn->add_constant(elfcpp::DT_DEBUG, 0);
1582         }
1583     }
1584
1585   // Emit any relocs we saved in an attempt to avoid generating COPY
1586   // relocs.
1587   if (this->copy_relocs_.any_saved_relocs())
1588     this->copy_relocs_.emit(this->rel_dyn_section(layout));
1589 }
1590
1591 // Return whether a direct absolute static relocation needs to be applied.
1592 // In cases where Scan::local() or Scan::global() has created
1593 // a dynamic relocation other than R_386_RELATIVE, the addend
1594 // of the relocation is carried in the data, and we must not
1595 // apply the static relocation.
1596
1597 inline bool
1598 Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym,
1599                                                  int ref_flags,
1600                                                  bool is_32bit,
1601                                                  Output_section* output_section)
1602 {
1603   // If the output section is not allocated, then we didn't call
1604   // scan_relocs, we didn't create a dynamic reloc, and we must apply
1605   // the reloc here.
1606   if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0)
1607     return true;
1608
1609   // For local symbols, we will have created a non-RELATIVE dynamic
1610   // relocation only if (a) the output is position independent,
1611   // (b) the relocation is absolute (not pc- or segment-relative), and
1612   // (c) the relocation is not 32 bits wide.
1613   if (gsym == NULL)
1614     return !(parameters->options().output_is_position_independent()
1615              && (ref_flags & Symbol::ABSOLUTE_REF)
1616              && !is_32bit);
1617
1618   // For global symbols, we use the same helper routines used in the
1619   // scan pass.  If we did not create a dynamic relocation, or if we
1620   // created a RELATIVE dynamic relocation, we should apply the static
1621   // relocation.
1622   bool has_dyn = gsym->needs_dynamic_reloc(ref_flags);
1623   bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF)
1624                 && gsym->can_use_relative_reloc(ref_flags
1625                                                 & Symbol::FUNCTION_CALL);
1626   return !has_dyn || is_rel;
1627 }
1628
1629 // Perform a relocation.
1630
1631 inline bool
1632 Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo,
1633                                 Target_i386* target,
1634                                 Output_section *output_section,
1635                                 size_t relnum,
1636                                 const elfcpp::Rel<32, false>& rel,
1637                                 unsigned int r_type,
1638                                 const Sized_symbol<32>* gsym,
1639                                 const Symbol_value<32>* psymval,
1640                                 unsigned char* view,
1641                                 elfcpp::Elf_types<32>::Elf_Addr address,
1642                                 section_size_type view_size)
1643 {
1644   if (this->skip_call_tls_get_addr_)
1645     {
1646       if ((r_type != elfcpp::R_386_PLT32
1647            && r_type != elfcpp::R_386_PC32)
1648           || gsym == NULL
1649           || strcmp(gsym->name(), "___tls_get_addr") != 0)
1650         gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
1651                                _("missing expected TLS relocation"));
1652       else
1653         {
1654           this->skip_call_tls_get_addr_ = false;
1655           return false;
1656         }
1657     }
1658
1659   // Pick the value to use for symbols defined in shared objects.
1660   Symbol_value<32> symval;
1661   if (gsym != NULL
1662       && gsym->use_plt_offset(r_type == elfcpp::R_386_PC8
1663                               || r_type == elfcpp::R_386_PC16
1664                               || r_type == elfcpp::R_386_PC32))
1665     {
1666       symval.set_output_value(target->plt_section()->address()
1667                               + gsym->plt_offset());
1668       psymval = &symval;
1669     }
1670
1671   const Sized_relobj<32, false>* object = relinfo->object;
1672
1673   // Get the GOT offset if needed.
1674   // The GOT pointer points to the end of the GOT section.
1675   // We need to subtract the size of the GOT section to get
1676   // the actual offset to use in the relocation.
1677   bool have_got_offset = false;
1678   unsigned int got_offset = 0;
1679   switch (r_type)
1680     {
1681     case elfcpp::R_386_GOT32:
1682       if (gsym != NULL)
1683         {
1684           gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
1685           got_offset = (gsym->got_offset(GOT_TYPE_STANDARD)
1686                         - target->got_size());
1687         }
1688       else
1689         {
1690           unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
1691           gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
1692           got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
1693                         - target->got_size());
1694         }
1695       have_got_offset = true;
1696       break;
1697
1698     default:
1699       break;
1700     }
1701
1702   switch (r_type)
1703     {
1704     case elfcpp::R_386_NONE:
1705     case elfcpp::R_386_GNU_VTINHERIT:
1706     case elfcpp::R_386_GNU_VTENTRY:
1707       break;
1708
1709     case elfcpp::R_386_32:
1710       if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true,
1711                                     output_section))
1712         Relocate_functions<32, false>::rel32(view, object, psymval);
1713       break;
1714
1715     case elfcpp::R_386_PC32:
1716       {
1717         int ref_flags = Symbol::NON_PIC_REF;
1718         if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC)
1719           ref_flags |= Symbol::FUNCTION_CALL;
1720         if (should_apply_static_reloc(gsym, ref_flags, true, output_section))
1721           Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
1722       }
1723       break;
1724
1725     case elfcpp::R_386_16:
1726       if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false,
1727                                     output_section))
1728         Relocate_functions<32, false>::rel16(view, object, psymval);
1729       break;
1730
1731     case elfcpp::R_386_PC16:
1732       {
1733         int ref_flags = Symbol::NON_PIC_REF;
1734         if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC)
1735           ref_flags |= Symbol::FUNCTION_CALL;
1736         if (should_apply_static_reloc(gsym, ref_flags, false, output_section))
1737           Relocate_functions<32, false>::pcrel16(view, object, psymval, address);
1738       }
1739       break;
1740
1741     case elfcpp::R_386_8:
1742       if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false,
1743                                     output_section))
1744         Relocate_functions<32, false>::rel8(view, object, psymval);
1745       break;
1746
1747     case elfcpp::R_386_PC8:
1748       {
1749         int ref_flags = Symbol::NON_PIC_REF;
1750         if (gsym != NULL && gsym->type() == elfcpp::STT_FUNC)
1751           ref_flags |= Symbol::FUNCTION_CALL;
1752         if (should_apply_static_reloc(gsym, ref_flags, false,
1753                                       output_section))
1754           Relocate_functions<32, false>::pcrel8(view, object, psymval, address);
1755       }
1756       break;
1757
1758     case elfcpp::R_386_PLT32:
1759       gold_assert(gsym == NULL
1760                   || gsym->has_plt_offset()
1761                   || gsym->final_value_is_known()
1762                   || (gsym->is_defined()
1763                       && !gsym->is_from_dynobj()
1764                       && !gsym->is_preemptible()));
1765       Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
1766       break;
1767
1768     case elfcpp::R_386_GOT32:
1769       gold_assert(have_got_offset);
1770       Relocate_functions<32, false>::rel32(view, got_offset);
1771       break;
1772
1773     case elfcpp::R_386_GOTOFF:
1774       {
1775         elfcpp::Elf_types<32>::Elf_Addr value;
1776         value = (psymval->value(object, 0)
1777                  - target->got_plt_section()->address());
1778         Relocate_functions<32, false>::rel32(view, value);
1779       }
1780       break;
1781
1782     case elfcpp::R_386_GOTPC:
1783       {
1784         elfcpp::Elf_types<32>::Elf_Addr value;
1785         value = target->got_plt_section()->address();
1786         Relocate_functions<32, false>::pcrel32(view, value, address);
1787       }
1788       break;
1789
1790     case elfcpp::R_386_COPY:
1791     case elfcpp::R_386_GLOB_DAT:
1792     case elfcpp::R_386_JUMP_SLOT:
1793     case elfcpp::R_386_RELATIVE:
1794       // These are outstanding tls relocs, which are unexpected when
1795       // linking.
1796     case elfcpp::R_386_TLS_TPOFF:
1797     case elfcpp::R_386_TLS_DTPMOD32:
1798     case elfcpp::R_386_TLS_DTPOFF32:
1799     case elfcpp::R_386_TLS_TPOFF32:
1800     case elfcpp::R_386_TLS_DESC:
1801       gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
1802                              _("unexpected reloc %u in object file"),
1803                              r_type);
1804       break;
1805
1806       // These are initial tls relocs, which are expected when
1807       // linking.
1808     case elfcpp::R_386_TLS_GD:             // Global-dynamic
1809     case elfcpp::R_386_TLS_GOTDESC:        // Global-dynamic (from ~oliva url)
1810     case elfcpp::R_386_TLS_DESC_CALL:
1811     case elfcpp::R_386_TLS_LDM:            // Local-dynamic
1812     case elfcpp::R_386_TLS_LDO_32:         // Alternate local-dynamic
1813     case elfcpp::R_386_TLS_IE:             // Initial-exec
1814     case elfcpp::R_386_TLS_IE_32:
1815     case elfcpp::R_386_TLS_GOTIE:
1816     case elfcpp::R_386_TLS_LE:             // Local-exec
1817     case elfcpp::R_386_TLS_LE_32:
1818       this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval,
1819                          view, address, view_size);
1820       break;
1821
1822     case elfcpp::R_386_32PLT:
1823     case elfcpp::R_386_TLS_GD_32:
1824     case elfcpp::R_386_TLS_GD_PUSH:
1825     case elfcpp::R_386_TLS_GD_CALL:
1826     case elfcpp::R_386_TLS_GD_POP:
1827     case elfcpp::R_386_TLS_LDM_32:
1828     case elfcpp::R_386_TLS_LDM_PUSH:
1829     case elfcpp::R_386_TLS_LDM_CALL:
1830     case elfcpp::R_386_TLS_LDM_POP:
1831     case elfcpp::R_386_USED_BY_INTEL_200:
1832     default:
1833       gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
1834                              _("unsupported reloc %u"),
1835                              r_type);
1836       break;
1837     }
1838
1839   return true;
1840 }
1841
1842 // Perform a TLS relocation.
1843
1844 inline void
1845 Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo,
1846                                     Target_i386* target,
1847                                     size_t relnum,
1848                                     const elfcpp::Rel<32, false>& rel,
1849                                     unsigned int r_type,
1850                                     const Sized_symbol<32>* gsym,
1851                                     const Symbol_value<32>* psymval,
1852                                     unsigned char* view,
1853                                     elfcpp::Elf_types<32>::Elf_Addr,
1854                                     section_size_type view_size)
1855 {
1856   Output_segment* tls_segment = relinfo->layout->tls_segment();
1857
1858   const Sized_relobj<32, false>* object = relinfo->object;
1859
1860   elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0);
1861
1862   const bool is_final =
1863     (gsym == NULL
1864      ? !parameters->options().output_is_position_independent()
1865      : gsym->final_value_is_known());
1866   const tls::Tls_optimization optimized_type
1867       = Target_i386::optimize_tls_reloc(is_final, r_type);
1868   switch (r_type)
1869     {
1870     case elfcpp::R_386_TLS_GD:           // Global-dynamic
1871       if (optimized_type == tls::TLSOPT_TO_LE)
1872         {
1873           gold_assert(tls_segment != NULL);
1874           this->tls_gd_to_le(relinfo, relnum, tls_segment,
1875                              rel, r_type, value, view,
1876                              view_size);
1877           break;
1878         }
1879       else
1880         {
1881           unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
1882                                    ? GOT_TYPE_TLS_NOFFSET
1883                                    : GOT_TYPE_TLS_PAIR);
1884           unsigned int got_offset;
1885           if (gsym != NULL)
1886             {
1887               gold_assert(gsym->has_got_offset(got_type));
1888               got_offset = gsym->got_offset(got_type) - target->got_size();
1889             }
1890           else
1891             {
1892               unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
1893               gold_assert(object->local_has_got_offset(r_sym, got_type));
1894               got_offset = (object->local_got_offset(r_sym, got_type)
1895                             - target->got_size());
1896             }
1897           if (optimized_type == tls::TLSOPT_TO_IE)
1898             {
1899               gold_assert(tls_segment != NULL);
1900               this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type,
1901                                  got_offset, view, view_size);
1902               break;
1903             }
1904           else if (optimized_type == tls::TLSOPT_NONE)
1905             {
1906               // Relocate the field with the offset of the pair of GOT
1907               // entries.
1908               Relocate_functions<32, false>::rel32(view, got_offset);
1909               break;
1910             }
1911         }
1912       gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
1913                              _("unsupported reloc %u"),
1914                              r_type);
1915       break;
1916
1917     case elfcpp::R_386_TLS_GOTDESC:      // Global-dynamic (from ~oliva url)
1918     case elfcpp::R_386_TLS_DESC_CALL:
1919       this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU;
1920       if (optimized_type == tls::TLSOPT_TO_LE)
1921         {
1922           gold_assert(tls_segment != NULL);
1923           this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
1924                                   rel, r_type, value, view,
1925                                   view_size);
1926           break;
1927         }
1928       else
1929         {
1930           unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
1931                                    ? GOT_TYPE_TLS_NOFFSET
1932                                    : GOT_TYPE_TLS_DESC);
1933           unsigned int got_offset;
1934           if (gsym != NULL)
1935             {
1936               gold_assert(gsym->has_got_offset(got_type));
1937               got_offset = gsym->got_offset(got_type) - target->got_size();
1938             }
1939           else
1940             {
1941               unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
1942               gold_assert(object->local_has_got_offset(r_sym, got_type));
1943               got_offset = (object->local_got_offset(r_sym, got_type)
1944                             - target->got_size());
1945             }
1946           if (optimized_type == tls::TLSOPT_TO_IE)
1947             {
1948               gold_assert(tls_segment != NULL);
1949               this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type,
1950                                       got_offset, view, view_size);
1951               break;
1952             }
1953           else if (optimized_type == tls::TLSOPT_NONE)
1954             {
1955               if (r_type == elfcpp::R_386_TLS_GOTDESC)
1956                 {
1957                   // Relocate the field with the offset of the pair of GOT
1958                   // entries.
1959                   Relocate_functions<32, false>::rel32(view, got_offset);
1960                 }
1961               break;
1962             }
1963         }
1964       gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
1965                              _("unsupported reloc %u"),
1966                              r_type);
1967       break;
1968
1969     case elfcpp::R_386_TLS_LDM:          // Local-dynamic
1970       if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN)
1971         {
1972           gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
1973                                  _("both SUN and GNU model "
1974                                    "TLS relocations"));
1975           break;
1976         }
1977       this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU;
1978       if (optimized_type == tls::TLSOPT_TO_LE)
1979         {
1980           gold_assert(tls_segment != NULL);
1981           this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type,
1982                              value, view, view_size);
1983           break;
1984         }
1985       else if (optimized_type == tls::TLSOPT_NONE)
1986         {
1987           // Relocate the field with the offset of the GOT entry for
1988           // the module index.
1989           unsigned int got_offset;
1990           got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
1991                         - target->got_size());
1992           Relocate_functions<32, false>::rel32(view, got_offset);
1993           break;
1994         }
1995       gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
1996                              _("unsupported reloc %u"),
1997                              r_type);
1998       break;
1999
2000     case elfcpp::R_386_TLS_LDO_32:       // Alternate local-dynamic
2001       // This reloc can appear in debugging sections, in which case we
2002       // won't see the TLS_LDM reloc.  The local_dynamic_type field
2003       // tells us this.
2004       if (optimized_type == tls::TLSOPT_TO_LE
2005           && this->local_dynamic_type_ != LOCAL_DYNAMIC_NONE)
2006         {
2007           gold_assert(tls_segment != NULL);
2008           value -= tls_segment->memsz();
2009         }
2010       Relocate_functions<32, false>::rel32(view, value);
2011       break;
2012
2013     case elfcpp::R_386_TLS_IE:           // Initial-exec
2014     case elfcpp::R_386_TLS_GOTIE:
2015     case elfcpp::R_386_TLS_IE_32:
2016       if (optimized_type == tls::TLSOPT_TO_LE)
2017         {
2018           gold_assert(tls_segment != NULL);
2019           Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment,
2020                                               rel, r_type, value, view,
2021                                               view_size);
2022           break;
2023         }
2024       else if (optimized_type == tls::TLSOPT_NONE)
2025         {
2026           // Relocate the field with the offset of the GOT entry for
2027           // the tp-relative offset of the symbol.
2028           unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32
2029                                    ? GOT_TYPE_TLS_OFFSET
2030                                    : GOT_TYPE_TLS_NOFFSET);
2031           unsigned int got_offset;
2032           if (gsym != NULL)
2033             {
2034               gold_assert(gsym->has_got_offset(got_type));
2035               got_offset = gsym->got_offset(got_type);
2036             }
2037           else
2038             {
2039               unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
2040               gold_assert(object->local_has_got_offset(r_sym, got_type));
2041               got_offset = object->local_got_offset(r_sym, got_type);
2042             }
2043           // For the R_386_TLS_IE relocation, we need to apply the
2044           // absolute address of the GOT entry.
2045           if (r_type == elfcpp::R_386_TLS_IE)
2046             got_offset += target->got_plt_section()->address();
2047           // All GOT offsets are relative to the end of the GOT.
2048           got_offset -= target->got_size();
2049           Relocate_functions<32, false>::rel32(view, got_offset);
2050           break;
2051         }
2052       gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
2053                              _("unsupported reloc %u"),
2054                              r_type);
2055       break;
2056
2057     case elfcpp::R_386_TLS_LE:           // Local-exec
2058       // If we're creating a shared library, a dynamic relocation will
2059       // have been created for this location, so do not apply it now.
2060       if (!parameters->options().shared())
2061         {
2062           gold_assert(tls_segment != NULL);
2063           value -= tls_segment->memsz();
2064           Relocate_functions<32, false>::rel32(view, value);
2065         }
2066       break;
2067
2068     case elfcpp::R_386_TLS_LE_32:
2069       // If we're creating a shared library, a dynamic relocation will
2070       // have been created for this location, so do not apply it now.
2071       if (!parameters->options().shared())
2072         {
2073           gold_assert(tls_segment != NULL);
2074           value = tls_segment->memsz() - value;
2075           Relocate_functions<32, false>::rel32(view, value);
2076         }
2077       break;
2078     }
2079 }
2080
2081 // Do a relocation in which we convert a TLS General-Dynamic to a
2082 // Local-Exec.
2083
2084 inline void
2085 Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo,
2086                                     size_t relnum,
2087                                     Output_segment* tls_segment,
2088                                     const elfcpp::Rel<32, false>& rel,
2089                                     unsigned int,
2090                                     elfcpp::Elf_types<32>::Elf_Addr value,
2091                                     unsigned char* view,
2092                                     section_size_type view_size)
2093 {
2094   // leal foo(,%reg,1),%eax; call ___tls_get_addr
2095   //  ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2096   // leal foo(%reg),%eax; call ___tls_get_addr
2097   //  ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2098
2099   tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2100   tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9);
2101
2102   unsigned char op1 = view[-1];
2103   unsigned char op2 = view[-2];
2104
2105   tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2106                  op2 == 0x8d || op2 == 0x04);
2107   tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
2108
2109   int roff = 5;
2110
2111   if (op2 == 0x04)
2112     {
2113       tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3);
2114       tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d);
2115       tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2116                      ((op1 & 0xc7) == 0x05 && op1 != (4 << 3)));
2117       memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2118     }
2119   else
2120     {
2121       tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2122                      (op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
2123       if (rel.get_r_offset() + 9 < view_size
2124           && view[9] == 0x90)
2125         {
2126           // There is a trailing nop.  Use the size byte subl.
2127           memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2128           roff = 6;
2129         }
2130       else
2131         {
2132           // Use the five byte subl.
2133           memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2134         }
2135     }
2136
2137   value = tls_segment->memsz() - value;
2138   Relocate_functions<32, false>::rel32(view + roff, value);
2139
2140   // The next reloc should be a PLT32 reloc against __tls_get_addr.
2141   // We can skip it.
2142   this->skip_call_tls_get_addr_ = true;
2143 }
2144
2145 // Do a relocation in which we convert a TLS General-Dynamic to an
2146 // Initial-Exec.
2147
2148 inline void
2149 Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo,
2150                                     size_t relnum,
2151                                     Output_segment*,
2152                                     const elfcpp::Rel<32, false>& rel,
2153                                     unsigned int,
2154                                     elfcpp::Elf_types<32>::Elf_Addr value,
2155                                     unsigned char* view,
2156                                     section_size_type view_size)
2157 {
2158   // leal foo(,%ebx,1),%eax; call ___tls_get_addr
2159   //  ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax
2160
2161   tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2162   tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9);
2163
2164   unsigned char op1 = view[-1];
2165   unsigned char op2 = view[-2];
2166
2167   tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2168                  op2 == 0x8d || op2 == 0x04);
2169   tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
2170
2171   int roff = 5;
2172
2173   // FIXME: For now, support only the first (SIB) form.
2174   tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04);
2175
2176   if (op2 == 0x04)
2177     {
2178       tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3);
2179       tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d);
2180       tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2181                      ((op1 & 0xc7) == 0x05 && op1 != (4 << 3)));
2182       memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12);
2183     }
2184   else
2185     {
2186       tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2187                      (op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
2188       if (rel.get_r_offset() + 9 < view_size
2189           && view[9] == 0x90)
2190         {
2191           // FIXME: This is not the right instruction sequence.
2192           // There is a trailing nop.  Use the size byte subl.
2193           memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2194           roff = 6;
2195         }
2196       else
2197         {
2198           // FIXME: This is not the right instruction sequence.
2199           // Use the five byte subl.
2200           memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2201         }
2202     }
2203
2204   Relocate_functions<32, false>::rel32(view + roff, value);
2205
2206   // The next reloc should be a PLT32 reloc against __tls_get_addr.
2207   // We can skip it.
2208   this->skip_call_tls_get_addr_ = true;
2209 }
2210
2211 // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
2212 // General-Dynamic to a Local-Exec.
2213
2214 inline void
2215 Target_i386::Relocate::tls_desc_gd_to_le(
2216     const Relocate_info<32, false>* relinfo,
2217     size_t relnum,
2218     Output_segment* tls_segment,
2219     const elfcpp::Rel<32, false>& rel,
2220     unsigned int r_type,
2221     elfcpp::Elf_types<32>::Elf_Addr value,
2222     unsigned char* view,
2223     section_size_type view_size)
2224 {
2225   if (r_type == elfcpp::R_386_TLS_GOTDESC)
2226     {
2227       // leal foo@TLSDESC(%ebx), %eax
2228       // ==> leal foo@NTPOFF, %eax
2229       tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2230       tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4);
2231       tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2232                      view[-2] == 0x8d && view[-1] == 0x83);
2233       view[-1] = 0x05;
2234       value -= tls_segment->memsz();
2235       Relocate_functions<32, false>::rel32(view, value);
2236     }
2237   else
2238     {
2239       // call *foo@TLSCALL(%eax)
2240       // ==> nop; nop
2241       gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL);
2242       tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2);
2243       tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2244                      view[0] == 0xff && view[1] == 0x10);
2245       view[0] = 0x66;
2246       view[1] = 0x90;
2247     }
2248 }
2249
2250 // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
2251 // General-Dynamic to an Initial-Exec.
2252
2253 inline void
2254 Target_i386::Relocate::tls_desc_gd_to_ie(
2255     const Relocate_info<32, false>* relinfo,
2256     size_t relnum,
2257     Output_segment*,
2258     const elfcpp::Rel<32, false>& rel,
2259     unsigned int r_type,
2260     elfcpp::Elf_types<32>::Elf_Addr value,
2261     unsigned char* view,
2262     section_size_type view_size)
2263 {
2264   if (r_type == elfcpp::R_386_TLS_GOTDESC)
2265     {
2266       // leal foo@TLSDESC(%ebx), %eax
2267       // ==> movl foo@GOTNTPOFF(%ebx), %eax
2268       tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2269       tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4);
2270       tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2271                      view[-2] == 0x8d && view[-1] == 0x83);
2272       view[-2] = 0x8b;
2273       Relocate_functions<32, false>::rel32(view, value);
2274     }
2275   else
2276     {
2277       // call *foo@TLSCALL(%eax)
2278       // ==> nop; nop
2279       gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL);
2280       tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2);
2281       tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2282                      view[0] == 0xff && view[1] == 0x10);
2283       view[0] = 0x66;
2284       view[1] = 0x90;
2285     }
2286 }
2287
2288 // Do a relocation in which we convert a TLS Local-Dynamic to a
2289 // Local-Exec.
2290
2291 inline void
2292 Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo,
2293                                     size_t relnum,
2294                                     Output_segment*,
2295                                     const elfcpp::Rel<32, false>& rel,
2296                                     unsigned int,
2297                                     elfcpp::Elf_types<32>::Elf_Addr,
2298                                     unsigned char* view,
2299                                     section_size_type view_size)
2300 {
2301   // leal foo(%reg), %eax; call ___tls_get_addr
2302   // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi
2303
2304   tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2305   tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9);
2306
2307   // FIXME: Does this test really always pass?
2308   tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2309                  view[-2] == 0x8d && view[-1] == 0x83);
2310
2311   tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
2312
2313   memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
2314
2315   // The next reloc should be a PLT32 reloc against __tls_get_addr.
2316   // We can skip it.
2317   this->skip_call_tls_get_addr_ = true;
2318 }
2319
2320 // Do a relocation in which we convert a TLS Initial-Exec to a
2321 // Local-Exec.
2322
2323 inline void
2324 Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo,
2325                                     size_t relnum,
2326                                     Output_segment* tls_segment,
2327                                     const elfcpp::Rel<32, false>& rel,
2328                                     unsigned int r_type,
2329                                     elfcpp::Elf_types<32>::Elf_Addr value,
2330                                     unsigned char* view,
2331                                     section_size_type view_size)
2332 {
2333   // We have to actually change the instructions, which means that we
2334   // need to examine the opcodes to figure out which instruction we
2335   // are looking at.
2336   if (r_type == elfcpp::R_386_TLS_IE)
2337     {
2338       // movl %gs:XX,%eax  ==>  movl $YY,%eax
2339       // movl %gs:XX,%reg  ==>  movl $YY,%reg
2340       // addl %gs:XX,%reg  ==>  addl $YY,%reg
2341       tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1);
2342       tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4);
2343
2344       unsigned char op1 = view[-1];
2345       if (op1 == 0xa1)
2346         {
2347           // movl XX,%eax  ==>  movl $YY,%eax
2348           view[-1] = 0xb8;
2349         }
2350       else
2351         {
2352           tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2353
2354           unsigned char op2 = view[-2];
2355           if (op2 == 0x8b)
2356             {
2357               // movl XX,%reg  ==>  movl $YY,%reg
2358               tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2359                              (op1 & 0xc7) == 0x05);
2360               view[-2] = 0xc7;
2361               view[-1] = 0xc0 | ((op1 >> 3) & 7);
2362             }
2363           else if (op2 == 0x03)
2364             {
2365               // addl XX,%reg  ==>  addl $YY,%reg
2366               tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2367                              (op1 & 0xc7) == 0x05);
2368               view[-2] = 0x81;
2369               view[-1] = 0xc0 | ((op1 >> 3) & 7);
2370             }
2371           else
2372             tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0);
2373         }
2374     }
2375   else
2376     {
2377       // subl %gs:XX(%reg1),%reg2  ==>  subl $YY,%reg2
2378       // movl %gs:XX(%reg1),%reg2  ==>  movl $YY,%reg2
2379       // addl %gs:XX(%reg1),%reg2  ==>  addl $YY,$reg2
2380       tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2381       tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4);
2382
2383       unsigned char op1 = view[-1];
2384       unsigned char op2 = view[-2];
2385       tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2386                      (op1 & 0xc0) == 0x80 && (op1 & 7) != 4);
2387       if (op2 == 0x8b)
2388         {
2389           // movl %gs:XX(%reg1),%reg2  ==>  movl $YY,%reg2
2390           view[-2] = 0xc7;
2391           view[-1] = 0xc0 | ((op1 >> 3) & 7);
2392         }
2393       else if (op2 == 0x2b)
2394         {
2395           // subl %gs:XX(%reg1),%reg2  ==>  subl $YY,%reg2
2396           view[-2] = 0x81;
2397           view[-1] = 0xe8 | ((op1 >> 3) & 7);
2398         }
2399       else if (op2 == 0x03)
2400         {
2401           // addl %gs:XX(%reg1),%reg2  ==>  addl $YY,$reg2
2402           view[-2] = 0x81;
2403           view[-1] = 0xc0 | ((op1 >> 3) & 7);
2404         }
2405       else
2406         tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0);
2407     }
2408
2409   value = tls_segment->memsz() - value;
2410   if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE)
2411     value = - value;
2412
2413   Relocate_functions<32, false>::rel32(view, value);
2414 }
2415
2416 // Relocate section data.
2417
2418 void
2419 Target_i386::relocate_section(const Relocate_info<32, false>* relinfo,
2420                               unsigned int sh_type,
2421                               const unsigned char* prelocs,
2422                               size_t reloc_count,
2423                               Output_section* output_section,
2424                               bool needs_special_offset_handling,
2425                               unsigned char* view,
2426                               elfcpp::Elf_types<32>::Elf_Addr address,
2427                               section_size_type view_size)
2428 {
2429   gold_assert(sh_type == elfcpp::SHT_REL);
2430
2431   gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL,
2432                          Target_i386::Relocate>(
2433     relinfo,
2434     this,
2435     prelocs,
2436     reloc_count,
2437     output_section,
2438     needs_special_offset_handling,
2439     view,
2440     address,
2441     view_size);
2442 }
2443
2444 // Return the size of a relocation while scanning during a relocatable
2445 // link.
2446
2447 unsigned int
2448 Target_i386::Relocatable_size_for_reloc::get_size_for_reloc(
2449     unsigned int r_type,
2450     Relobj* object)
2451 {
2452   switch (r_type)
2453     {
2454     case elfcpp::R_386_NONE:
2455     case elfcpp::R_386_GNU_VTINHERIT:
2456     case elfcpp::R_386_GNU_VTENTRY:
2457     case elfcpp::R_386_TLS_GD:            // Global-dynamic
2458     case elfcpp::R_386_TLS_GOTDESC:       // Global-dynamic (from ~oliva url)
2459     case elfcpp::R_386_TLS_DESC_CALL:
2460     case elfcpp::R_386_TLS_LDM:           // Local-dynamic
2461     case elfcpp::R_386_TLS_LDO_32:        // Alternate local-dynamic
2462     case elfcpp::R_386_TLS_IE:            // Initial-exec
2463     case elfcpp::R_386_TLS_IE_32:
2464     case elfcpp::R_386_TLS_GOTIE:
2465     case elfcpp::R_386_TLS_LE:            // Local-exec
2466     case elfcpp::R_386_TLS_LE_32:
2467       return 0;
2468
2469     case elfcpp::R_386_32:
2470     case elfcpp::R_386_PC32:
2471     case elfcpp::R_386_GOT32:
2472     case elfcpp::R_386_PLT32:
2473     case elfcpp::R_386_GOTOFF:
2474     case elfcpp::R_386_GOTPC:
2475      return 4;
2476
2477     case elfcpp::R_386_16:
2478     case elfcpp::R_386_PC16:
2479       return 2;
2480
2481     case elfcpp::R_386_8:
2482     case elfcpp::R_386_PC8:
2483       return 1;
2484
2485       // These are relocations which should only be seen by the
2486       // dynamic linker, and should never be seen here.
2487     case elfcpp::R_386_COPY:
2488     case elfcpp::R_386_GLOB_DAT:
2489     case elfcpp::R_386_JUMP_SLOT:
2490     case elfcpp::R_386_RELATIVE:
2491     case elfcpp::R_386_TLS_TPOFF:
2492     case elfcpp::R_386_TLS_DTPMOD32:
2493     case elfcpp::R_386_TLS_DTPOFF32:
2494     case elfcpp::R_386_TLS_TPOFF32:
2495     case elfcpp::R_386_TLS_DESC:
2496       object->error(_("unexpected reloc %u in object file"), r_type);
2497       return 0;
2498
2499     case elfcpp::R_386_32PLT:
2500     case elfcpp::R_386_TLS_GD_32:
2501     case elfcpp::R_386_TLS_GD_PUSH:
2502     case elfcpp::R_386_TLS_GD_CALL:
2503     case elfcpp::R_386_TLS_GD_POP:
2504     case elfcpp::R_386_TLS_LDM_32:
2505     case elfcpp::R_386_TLS_LDM_PUSH:
2506     case elfcpp::R_386_TLS_LDM_CALL:
2507     case elfcpp::R_386_TLS_LDM_POP:
2508     case elfcpp::R_386_USED_BY_INTEL_200:
2509     default:
2510       object->error(_("unsupported reloc %u in object file"), r_type);
2511       return 0;
2512     }
2513 }
2514
2515 // Scan the relocs during a relocatable link.
2516
2517 void
2518 Target_i386::scan_relocatable_relocs(const General_options& options,
2519                                      Symbol_table* symtab,
2520                                      Layout* layout,
2521                                      Sized_relobj<32, false>* object,
2522                                      unsigned int data_shndx,
2523                                      unsigned int sh_type,
2524                                      const unsigned char* prelocs,
2525                                      size_t reloc_count,
2526                                      Output_section* output_section,
2527                                      bool needs_special_offset_handling,
2528                                      size_t local_symbol_count,
2529                                      const unsigned char* plocal_symbols,
2530                                      Relocatable_relocs* rr)
2531 {
2532   gold_assert(sh_type == elfcpp::SHT_REL);
2533
2534   typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL,
2535     Relocatable_size_for_reloc> Scan_relocatable_relocs;
2536
2537   gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL,
2538       Scan_relocatable_relocs>(
2539     options,
2540     symtab,
2541     layout,
2542     object,
2543     data_shndx,
2544     prelocs,
2545     reloc_count,
2546     output_section,
2547     needs_special_offset_handling,
2548     local_symbol_count,
2549     plocal_symbols,
2550     rr);
2551 }
2552
2553 // Relocate a section during a relocatable link.
2554
2555 void
2556 Target_i386::relocate_for_relocatable(
2557     const Relocate_info<32, false>* relinfo,
2558     unsigned int sh_type,
2559     const unsigned char* prelocs,
2560     size_t reloc_count,
2561     Output_section* output_section,
2562     off_t offset_in_output_section,
2563     const Relocatable_relocs* rr,
2564     unsigned char* view,
2565     elfcpp::Elf_types<32>::Elf_Addr view_address,
2566     section_size_type view_size,
2567     unsigned char* reloc_view,
2568     section_size_type reloc_view_size)
2569 {
2570   gold_assert(sh_type == elfcpp::SHT_REL);
2571
2572   gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>(
2573     relinfo,
2574     prelocs,
2575     reloc_count,
2576     output_section,
2577     offset_in_output_section,
2578     rr,
2579     view,
2580     view_address,
2581     view_size,
2582     reloc_view,
2583     reloc_view_size);
2584 }
2585
2586 // Return the value to use for a dynamic which requires special
2587 // treatment.  This is how we support equality comparisons of function
2588 // pointers across shared library boundaries, as described in the
2589 // processor specific ABI supplement.
2590
2591 uint64_t
2592 Target_i386::do_dynsym_value(const Symbol* gsym) const
2593 {
2594   gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
2595   return this->plt_section()->address() + gsym->plt_offset();
2596 }
2597
2598 // Return a string used to fill a code section with nops to take up
2599 // the specified length.
2600
2601 std::string
2602 Target_i386::do_code_fill(section_size_type length) const
2603 {
2604   if (length >= 16)
2605     {
2606       // Build a jmp instruction to skip over the bytes.
2607       unsigned char jmp[5];
2608       jmp[0] = 0xe9;
2609       elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
2610       return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
2611               + std::string(length - 5, '\0'));
2612     }
2613
2614   // Nop sequences of various lengths.
2615   const char nop1[1] = { 0x90 };                   // nop
2616   const char nop2[2] = { 0x66, 0x90 };             // xchg %ax %ax
2617   const char nop3[3] = { 0x8d, 0x76, 0x00 };       // leal 0(%esi),%esi
2618   const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00};  // leal 0(%esi,1),%esi
2619   const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26,   // nop
2620                          0x00 };                   // leal 0(%esi,1),%esi
2621   const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00,   // leal 0L(%esi),%esi
2622                          0x00, 0x00 };
2623   const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00,   // leal 0L(%esi,1),%esi
2624                          0x00, 0x00, 0x00 };
2625   const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26,   // nop
2626                          0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi
2627   const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc,   // movl %esi,%esi
2628                          0x27, 0x00, 0x00, 0x00,   // leal 0L(%edi,1),%edi
2629                          0x00 };
2630   const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi
2631                            0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi
2632                            0x00, 0x00 };
2633   const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi
2634                            0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi
2635                            0x00, 0x00, 0x00 };
2636   const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2637                            0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi
2638                            0x00, 0x00, 0x00, 0x00 };
2639   const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2640                            0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi
2641                            0x27, 0x00, 0x00, 0x00,
2642                            0x00 };
2643   const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
2644                            0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi
2645                            0xbc, 0x27, 0x00, 0x00,
2646                            0x00, 0x00 };
2647   const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15
2648                            0x90, 0x90, 0x90, 0x90, // nop,nop,nop,...
2649                            0x90, 0x90, 0x90, 0x90,
2650                            0x90, 0x90, 0x90 };
2651
2652   const char* nops[16] = {
2653     NULL,
2654     nop1, nop2, nop3, nop4, nop5, nop6, nop7,
2655     nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15
2656   };
2657
2658   return std::string(nops[length], length);
2659 }
2660
2661 // The selector for i386 object files.
2662
2663 class Target_selector_i386 : public Target_selector_freebsd
2664 {
2665 public:
2666   Target_selector_i386()
2667     : Target_selector_freebsd(elfcpp::EM_386, 32, false,
2668                               "elf32-i386", "elf32-i386-freebsd")
2669   { }
2670
2671   Target*
2672   do_instantiate_target()
2673   { return new Target_i386(); }
2674 };
2675
2676 Target_selector_i386 target_selector_i386;
2677
2678 } // End anonymous namespace.