gold/i386.cc

   1 // i386.cc -- i386 target support for gold.
   2
   3 #include "gold.h"
   4
   5 #include <cstring>
   6
   7 #include "elfcpp.h"
   8 #include "reloc.h"
   9 #include "i386.h"
  10 #include "object.h"
  11 #include "symtab.h"
  12 #include "layout.h"
  13 #include "output.h"
  14 #include "target.h"
  15 #include "target-reloc.h"
  16 #include "target-select.h"
  17
  18 namespace
  19 {
  20
  21 using namespace gold;
  22
  23 class Output_data_plt_i386;
  24
  25 // The i386 target class.
  26
  27 class Target_i386 : public Sized_target<32, false>
  28 {
  29  public:
  30   typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
  31
  32   Target_i386()
  33     : Sized_target<32, false>(&i386_info),
  34       got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL),
  35       copy_relocs_(NULL), dynbss_(NULL)
  36   { }
  37
  38   // Scan the relocations to look for symbol adjustments.
  39   void
  40   scan_relocs(const General_options& options,
  41               Symbol_table* symtab,
  42               Layout* layout,
  43               Sized_relobj<32, false>* object,
  44               unsigned int data_shndx,
  45               unsigned int sh_type,
  46               const unsigned char* prelocs,
  47               size_t reloc_count,
  48               size_t local_symbol_count,
  49               const unsigned char* plocal_symbols,
  50               Symbol** global_symbols);
  51
  52   // Finalize the sections.
  53   void
  54   do_finalize_sections(Layout*);
  55
  56   // Relocate a section.
  57   void
  58   relocate_section(const Relocate_info<32, false>*,
  59                    unsigned int sh_type,
  60                    const unsigned char* prelocs,
  61                    size_t reloc_count,
  62                    unsigned char* view,
  63                    elfcpp::Elf_types<32>::Elf_Addr view_address,
  64                    off_t view_size);
  65
  66  private:
  67   // The class which scans relocations.
  68   struct Scan
  69   {
  70     inline void
  71     local(const General_options& options, Symbol_table* symtab,
  72           Layout* layout, Target_i386* target,
  73           Sized_relobj<32, false>* object,
  74           unsigned int data_shndx,
  75           const elfcpp::Rel<32, false>& reloc, unsigned int r_type,
  76           const elfcpp::Sym<32, false>& lsym);
  77
  78     inline void
  79     global(const General_options& options, Symbol_table* symtab,
  80            Layout* layout, Target_i386* target,
  81            Sized_relobj<32, false>* object,
  82            unsigned int data_shndx,
  83            const elfcpp::Rel<32, false>& reloc, unsigned int r_type,
  84            Symbol* gsym);
  85   };
  86
  87   // The class which implements relocation.
  88   class Relocate
  89   {
  90    public:
  91     Relocate()
  92       : skip_call_tls_get_addr_(false)
  93     { }
  94
  95     ~Relocate()
  96     {
  97       if (this->skip_call_tls_get_addr_)
  98         {
  99           // FIXME: This needs to specify the location somehow.
 100           fprintf(stderr, _("%s: missing expected TLS relocation\n"),
 101                   program_name);
 102           gold_exit(false);
 103         }
 104     }
 105
 106     // Do a relocation.  Return false if the caller should not issue
 107     // any warnings about this relocation.
 108     inline bool
 109     relocate(const Relocate_info<32, false>*, Target_i386*, size_t relnum,
 110              const elfcpp::Rel<32, false>&,
 111              unsigned int r_type, const Sized_symbol<32>*,
 112              elfcpp::Elf_types<32>::Elf_Addr,
 113              unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
 114              off_t);
 115
 116    private:
 117     // Do a TLS relocation.
 118     inline void
 119     relocate_tls(const Relocate_info<32, false>*, size_t relnum,
 120                  const elfcpp::Rel<32, false>&,
 121                  unsigned int r_type, const Sized_symbol<32>*,
 122                  elfcpp::Elf_types<32>::Elf_Addr,
 123                  unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, off_t);
 124
 125     // Do a TLS Initial-Exec to Local-Exec transition.
 126     static inline void
 127     tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum,
 128                  Output_segment* tls_segment,
 129                  const elfcpp::Rel<32, false>&, unsigned int r_type,
 130                  elfcpp::Elf_types<32>::Elf_Addr value,
 131                  unsigned char* view,
 132                  off_t view_size);
 133
 134     // Do a TLS Global-Dynamic to Local-Exec transition.
 135     inline void
 136     tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum,
 137                  Output_segment* tls_segment,
 138                  const elfcpp::Rel<32, false>&, unsigned int r_type,
 139                  elfcpp::Elf_types<32>::Elf_Addr value,
 140                  unsigned char* view,
 141                  off_t view_size);
 142
 143     // Check the range for a TLS relocation.
 144     static inline void
 145     check_range(const Relocate_info<32, false>*, size_t relnum,
 146                 const elfcpp::Rel<32, false>&, off_t, off_t);
 147
 148     // Check the validity of a TLS relocation.  This is like assert.
 149     static inline void
 150     check_tls(const Relocate_info<32, false>*, size_t relnum,
 151               const elfcpp::Rel<32, false>&, bool);
 152
 153     // This is set if we should skip the next reloc, which should be a
 154     // PLT32 reloc against ___tls_get_addr.
 155     bool skip_call_tls_get_addr_;
 156   };
 157
 158   // Adjust TLS relocation type based on the options and whether this
 159   // is a local symbol.
 160   static unsigned int
 161   optimize_tls_reloc(const General_options*, bool is_final, int r_type);
 162
 163   // Get the GOT section, creating it if necessary.
 164   Output_data_got<32, false>*
 165   got_section(const General_options*, Symbol_table*, Layout*);
 166
 167   // Create a PLT entry for a global symbol.
 168   void
 169   make_plt_entry(const General_options* options, Symbol_table*,
 170                  Layout*, Symbol*);
 171
 172   // Get the PLT section.
 173   Output_data_plt_i386*
 174   plt_section() const
 175   {
 176     gold_assert(this->plt_ != NULL);
 177     return this->plt_;
 178   }
 179
 180   // Get the dynamic reloc section, creating it if necessary.
 181   Reloc_section*
 182   rel_dyn_section(Layout*);
 183
 184   // Copy a relocation against a global symbol.
 185   void
 186   copy_reloc(const General_options*, Symbol_table*, Layout*,
 187              Sized_relobj<32, false>*, unsigned int,
 188              Symbol*, const elfcpp::Rel<32, false>&);
 189
 190   // Information about this specific target which we pass to the
 191   // general Target structure.
 192   static const Target::Target_info i386_info;
 193
 194   // The GOT section.
 195   Output_data_got<32, false>* got_;
 196   // The PLT section.
 197   Output_data_plt_i386* plt_;
 198   // The GOT PLT section.
 199   Output_data_space* got_plt_;
 200   // The dynamic reloc section.
 201   Reloc_section* rel_dyn_;
 202   // Relocs saved to avoid a COPY reloc.
 203   Copy_relocs<32, false>* copy_relocs_;
 204   // Space for variables copied with a COPY reloc.
 205   Output_data_space* dynbss_;
 206 };
 207
 208 const Target::Target_info Target_i386::i386_info =
 209 {
 210   32,                   // size
 211   false,                // is_big_endian
 212   elfcpp::EM_386,       // machine_code
 213   false,                // has_make_symbol
 214   false,                // has_resolve
 215   "/usr/lib/libc.so.1", // dynamic_linker
 216   0x08048000,           // text_segment_address
 217   0x1000,               // abi_pagesize
 218   0x1000                // common_pagesize
 219 };
 220
 221 // Get the GOT section, creating it if necessary.
 222
 223 Output_data_got<32, false>*
 224 Target_i386::got_section(const General_options* options, Symbol_table* symtab,
 225                          Layout* layout)
 226 {
 227   if (this->got_ == NULL)
 228     {
 229       gold_assert(options != NULL && symtab != NULL && layout != NULL);
 230
 231       this->got_ = new Output_data_got<32, false>(options);
 232
 233       layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
 234                                       elfcpp::SHF_ALLOC, this->got_);
 235
 236       // The old GNU linker creates a .got.plt section.  We just
 237       // create another set of data in the .got section.  Note that we
 238       // always create a PLT if we create a GOT, although the PLT
 239       // might be empty.
 240       this->got_plt_ = new Output_data_space(4);
 241       layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
 242                                       elfcpp::SHF_ALLOC, this->got_plt_);
 243
 244       // The first three entries are reserved.
 245       this->got_plt_->set_space_size(3 * 4);
 246
 247       // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
 248       symtab->define_in_output_data(this, "_GLOBAL_OFFSET_TABLE_",
 249                                     this->got_plt_,
 250                                     0, 0, elfcpp::STT_OBJECT,
 251                                     elfcpp::STB_GLOBAL,
 252                                     elfcpp::STV_HIDDEN, 0,
 253                                     false, false);
 254     }
 255
 256   return this->got_;
 257 }
 258
 259 // Get the dynamic reloc section, creating it if necessary.
 260
 261 Target_i386::Reloc_section*
 262 Target_i386::rel_dyn_section(Layout* layout)
 263 {
 264   if (this->rel_dyn_ == NULL)
 265     {
 266       gold_assert(layout != NULL);
 267       this->rel_dyn_ = new Reloc_section();
 268       layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL,
 269                                       elfcpp::SHF_ALLOC, this->rel_dyn_);
 270     }
 271   return this->rel_dyn_;
 272 }
 273
 274 // A class to handle the PLT data.
 275
 276 class Output_data_plt_i386 : public Output_section_data
 277 {
 278  public:
 279   typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
 280
 281   Output_data_plt_i386(Layout*, Output_data_space*, bool is_shared);
 282
 283   // Add an entry to the PLT.
 284   void
 285   add_entry(Symbol* gsym);
 286
 287  private:
 288   // The size of an entry in the PLT.
 289   static const int plt_entry_size = 16;
 290
 291   // The first entry in the PLT for an executable.
 292   static unsigned char exec_first_plt_entry[plt_entry_size];
 293
 294   // The first entry in the PLT for a shared object.
 295   static unsigned char dyn_first_plt_entry[plt_entry_size];
 296
 297   // Other entries in the PLT for an executable.
 298   static unsigned char exec_plt_entry[plt_entry_size];
 299
 300   // Other entries in the PLT for a shared object.
 301   static unsigned char dyn_plt_entry[plt_entry_size];
 302
 303   // Set the final size.
 304   void
 305   do_set_address(uint64_t, off_t)
 306   { this->set_data_size((this->count_ + 1) * plt_entry_size); }
 307
 308   // Write out the PLT data.
 309   void
 310   do_write(Output_file*);
 311
 312   // The reloc section.
 313   Reloc_section* rel_;
 314   // The .got.plt section.
 315   Output_data_space* got_plt_;
 316   // The number of PLT entries.
 317   unsigned int count_;
 318   // Whether we are generated a shared object.
 319   bool is_shared_;
 320 };
 321
 322 // Create the PLT section.  The ordinary .got section is an argument,
 323 // since we need to refer to the start.  We also create our own .got
 324 // section just for PLT entries.
 325
 326 Output_data_plt_i386::Output_data_plt_i386(Layout* layout,
 327                                            Output_data_space* got_plt,
 328                                            bool is_shared)
 329   : Output_section_data(4), got_plt_(got_plt), is_shared_(is_shared)
 330 {
 331   this->rel_ = new Reloc_section();
 332   layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
 333                                   elfcpp::SHF_ALLOC, this->rel_);
 334 }
 335
 336 // Add an entry to the PLT.
 337
 338 void
 339 Output_data_plt_i386::add_entry(Symbol* gsym)
 340 {
 341   gold_assert(!gsym->has_plt_offset());
 342
 343   // Note that when setting the PLT offset we skip the initial
 344   // reserved PLT entry.
 345   gsym->set_plt_offset((this->count_ + 1) * plt_entry_size);
 346
 347   ++this->count_;
 348
 349   off_t got_offset = this->got_plt_->data_size();
 350
 351   // Every PLT entry needs a GOT entry which points back to the PLT
 352   // entry (this will be changed by the dynamic linker, normally
 353   // lazily when the function is called).
 354   this->got_plt_->set_space_size(got_offset + 4);
 355
 356   // Every PLT entry needs a reloc.
 357   this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_,
 358                          got_offset);
 359
 360   // Note that we don't need to save the symbol.  The contents of the
 361   // PLT are independent of which symbols are used.  The symbols only
 362   // appear in the relocations.
 363 }
 364
 365 // The first entry in the PLT for an executable.
 366
 367 unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] =
 368 {
 369   0xff, 0x35,   // pushl contents of memory address
 370   0, 0, 0, 0,   // replaced with address of .got + 4
 371   0xff, 0x25,   // jmp indirect
 372   0, 0, 0, 0,   // replaced with address of .got + 8
 373   0, 0, 0, 0    // unused
 374 };
 375
 376 // The first entry in the PLT for a shared object.
 377
 378 unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] =
 379 {
 380   0xff, 0xb3, 4, 0, 0, 0,       // pushl 4(%ebx)
 381   0xff, 0xa3, 8, 0, 0, 0,       // jmp *8(%ebx)
 382   0, 0, 0, 0                    // unused
 383 };
 384
 385 // Subsequent entries in the PLT for an executable.
 386
 387 unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] =
 388 {
 389   0xff, 0x25,   // jmp indirect
 390   0, 0, 0, 0,   // replaced with address of symbol in .got
 391   0x68,         // pushl immediate
 392   0, 0, 0, 0,   // replaced with offset into relocation table
 393   0xe9,         // jmp relative
 394   0, 0, 0, 0    // replaced with offset to start of .plt
 395 };
 396
 397 // Subsequent entries in the PLT for a shared object.
 398
 399 unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] =
 400 {
 401   0xff, 0xa3,   // jmp *offset(%ebx)
 402   0, 0, 0, 0,   // replaced with offset of symbol in .got
 403   0x68,         // pushl immediate
 404   0, 0, 0, 0,   // replaced with offset into relocation table
 405   0xe9,         // jmp relative
 406   0, 0, 0, 0    // replaced with offset to start of .plt
 407 };
 408
 409 // Write out the PLT.  This uses the hand-coded instructions above,
 410 // and adjusts them as needed.  This is all specified by the i386 ELF
 411 // Processor Supplement.
 412
 413 void
 414 Output_data_plt_i386::do_write(Output_file* of)
 415 {
 416   const off_t offset = this->offset();
 417   const off_t oview_size = this->data_size();
 418   unsigned char* const oview = of->get_output_view(offset, oview_size);
 419
 420   const off_t got_file_offset = this->got_plt_->offset();
 421   const off_t got_size = this->got_plt_->data_size();
 422   unsigned char* const got_view = of->get_output_view(got_file_offset,
 423                                                       got_size);
 424
 425   unsigned char* pov = oview;
 426
 427   elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address();
 428   elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address();
 429
 430   if (this->is_shared_)
 431     memcpy(pov, dyn_first_plt_entry, plt_entry_size);
 432   else
 433     {
 434       memcpy(pov, exec_first_plt_entry, plt_entry_size);
 435       elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4);
 436       elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8);
 437     }
 438   pov += plt_entry_size;
 439
 440   unsigned char* got_pov = got_view;
 441
 442   memset(got_pov, 0, 12);
 443   got_pov += 12;
 444
 445   const int rel_size = elfcpp::Elf_sizes<32>::rel_size;
 446
 447   unsigned int plt_offset = plt_entry_size;
 448   unsigned int plt_rel_offset = 0;
 449   unsigned int got_offset = 12;
 450   const unsigned int count = this->count_;
 451   for (unsigned int i = 0;
 452        i < count;
 453        ++i,
 454          pov += plt_entry_size,
 455          got_pov += 4,
 456          plt_offset += plt_entry_size,
 457          plt_rel_offset += rel_size,
 458          got_offset += 4)
 459     {
 460       // Set and adjust the PLT entry itself.
 461
 462       if (this->is_shared_)
 463         {
 464           memcpy(pov, dyn_plt_entry, plt_entry_size);
 465           elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset);
 466         }
 467       else
 468         {
 469           memcpy(pov, exec_plt_entry, plt_entry_size);
 470           elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
 471                                                       (got_address
 472                                                        + got_offset));
 473         }
 474
 475       elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset);
 476       elfcpp::Swap<32, false>::writeval(pov + 12,
 477                                         - (plt_offset + plt_entry_size));
 478
 479       // Set the entry in the GOT.
 480       elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6);
 481     }
 482
 483   gold_assert(pov - oview == oview_size);
 484   gold_assert(got_pov - got_view == got_size);
 485
 486   of->write_output_view(offset, oview_size, oview);
 487   of->write_output_view(got_file_offset, got_size, got_view);
 488 }
 489
 490 // Create a PLT entry for a global symbol.
 491
 492 void
 493 Target_i386::make_plt_entry(const General_options* options,
 494                             Symbol_table* symtab, Layout* layout, Symbol* gsym)
 495 {
 496   if (gsym->has_plt_offset())
 497     return;
 498
 499   if (this->plt_ == NULL)
 500     {
 501       // Create the GOT sections first.
 502       this->got_section(options, symtab, layout);
 503
 504       this->plt_ = new Output_data_plt_i386(layout, this->got_plt_,
 505                                             options->is_shared());
 506     }
 507
 508   this->plt_->add_entry(gsym);
 509 }
 510
 511 // Handle a relocation against a non-function symbol defined in a
 512 // dynamic object.  The traditional way to handle this is to generate
 513 // a COPY relocation to copy the variable at runtime from the shared
 514 // object into the executable's data segment.  However, this is
 515 // undesirable in general, as if the size of the object changes in the
 516 // dynamic object, the executable will no longer work correctly.  If
 517 // this relocation is in a writable section, then we can create a
 518 // dynamic reloc and the dynamic linker will resolve it to the correct
 519 // address at runtime.  However, we do not want do that if the
 520 // relocation is in a read-only section, as it would prevent the
 521 // readonly segment from being shared.  And if we have to eventually
 522 // generate a COPY reloc, then any dynamic relocations will be
 523 // useless.  So this means that if this is a writable section, we need
 524 // to save the relocation until we see whether we have to create a
 525 // COPY relocation for this symbol for any other relocation.
 526
 527 void
 528 Target_i386::copy_reloc(const General_options* options,
 529                         Symbol_table* symtab,
 530                         Layout* layout,
 531                         Sized_relobj<32, false>* object,
 532                         unsigned int data_shndx, Symbol* gsym,
 533                         const elfcpp::Rel<32, false>& rel)
 534 {
 535   Sized_symbol<32>* ssym;
 536   ssym = symtab->get_sized_symbol SELECT_SIZE_NAME(32) (gsym
 537                                                         SELECT_SIZE(32));
 538
 539   if (!Copy_relocs<32, false>::need_copy_reloc(options, object,
 540                                                data_shndx, ssym))
 541     {
 542       // So far we do not need a COPY reloc.  Save this relocation.
 543       // If it turns out that we never need a COPY reloc for this
 544       // symbol, then we will emit the relocation.
 545       if (this->copy_relocs_ == NULL)
 546         this->copy_relocs_ = new Copy_relocs<32, false>();
 547       this->copy_relocs_->save(ssym, object, data_shndx, rel);
 548     }
 549   else
 550     {
 551       // Allocate space for this symbol in the .bss section.
 552
 553       elfcpp::Elf_types<32>::Elf_WXword symsize = ssym->symsize();
 554
 555       // There is no defined way to determine the required alignment
 556       // of the symbol.  We pick the alignment based on the size.  We
 557       // set an arbitrary maximum of 256.
 558       unsigned int align;
 559       for (align = 1; align < 512; align <<= 1)
 560         if ((symsize & align) != 0)
 561           break;
 562
 563       if (this->dynbss_ == NULL)
 564         {
 565           this->dynbss_ = new Output_data_space(align);
 566           layout->add_output_section_data(".bss",
 567                                           elfcpp::SHT_NOBITS,
 568                                           (elfcpp::SHF_ALLOC
 569                                            | elfcpp::SHF_WRITE),
 570                                           this->dynbss_);
 571         }
 572
 573       Output_data_space* dynbss = this->dynbss_;
 574
 575       if (align > dynbss->addralign())
 576         dynbss->set_space_alignment(align);
 577
 578       off_t dynbss_size = dynbss->data_size();
 579       dynbss_size = align_address(dynbss_size, align);
 580       off_t offset = dynbss_size;
 581       dynbss->set_space_size(dynbss_size + symsize);
 582
 583       // Define the symbol in the .dynbss section.
 584       symtab->define_in_output_data(this, ssym->name(), dynbss, offset,
 585                                     symsize, ssym->type(), ssym->binding(),
 586                                     ssym->visibility(), ssym->nonvis(),
 587                                     false, false);
 588
 589       // Add the COPY reloc.
 590       Reloc_section* rel_dyn = this->rel_dyn_section(layout);
 591       rel_dyn->add_global(ssym, elfcpp::R_386_COPY, dynbss, offset);
 592     }
 593 }
 594
 595 // Optimize the TLS relocation type based on what we know about the
 596 // symbol.  IS_FINAL is true if the final address of this symbol is
 597 // known at link time.
 598
 599 unsigned int
 600 Target_i386::optimize_tls_reloc(const General_options* options,
 601                                 bool is_final,
 602                                 int r_type)
 603 {
 604   // If we are generating a shared library, then we can't do anything
 605   // in the linker.
 606   if (options->is_shared())
 607     return r_type;
 608
 609   switch (r_type)
 610     {
 611     case elfcpp::R_386_TLS_GD:
 612     case elfcpp::R_386_TLS_GOTDESC:
 613     case elfcpp::R_386_TLS_DESC_CALL:
 614       // These are Global-Dynamic which permits fully general TLS
 615       // access.  Since we know that we are generating an executable,
 616       // we can convert this to Initial-Exec.  If we also know that
 617       // this is a local symbol, we can further switch to Local-Exec.
 618       if (is_final)
 619         return elfcpp::R_386_TLS_LE_32;
 620       return elfcpp::R_386_TLS_IE_32;
 621
 622     case elfcpp::R_386_TLS_LDM:
 623       // This is Local-Dynamic, which refers to a local symbol in the
 624       // dynamic TLS block.  Since we know that we generating an
 625       // executable, we can switch to Local-Exec.
 626       return elfcpp::R_386_TLS_LE_32;
 627
 628     case elfcpp::R_386_TLS_LDO_32:
 629       // Another type of Local-Dynamic relocation.
 630       return elfcpp::R_386_TLS_LE;
 631
 632     case elfcpp::R_386_TLS_IE:
 633     case elfcpp::R_386_TLS_GOTIE:
 634     case elfcpp::R_386_TLS_IE_32:
 635       // These are Initial-Exec relocs which get the thread offset
 636       // from the GOT.  If we know that we are linking against the
 637       // local symbol, we can switch to Local-Exec, which links the
 638       // thread offset into the instruction.
 639       if (is_final)
 640         return elfcpp::R_386_TLS_LE_32;
 641       return r_type;
 642
 643     case elfcpp::R_386_TLS_LE:
 644     case elfcpp::R_386_TLS_LE_32:
 645       // When we already have Local-Exec, there is nothing further we
 646       // can do.
 647       return r_type;
 648
 649     default:
 650       gold_unreachable();
 651     }
 652 }
 653
 654 // Scan a relocation for a local symbol.
 655
 656 inline void
 657 Target_i386::Scan::local(const General_options& options,
 658                          Symbol_table* symtab,
 659                          Layout* layout,
 660                          Target_i386* target,
 661                          Sized_relobj<32, false>* object,
 662                          unsigned int,
 663                          const elfcpp::Rel<32, false>&,
 664                          unsigned int r_type,
 665                          const elfcpp::Sym<32, false>&)
 666 {
 667   switch (r_type)
 668     {
 669     case elfcpp::R_386_NONE:
 670     case elfcpp::R_386_GNU_VTINHERIT:
 671     case elfcpp::R_386_GNU_VTENTRY:
 672       break;
 673
 674     case elfcpp::R_386_32:
 675     case elfcpp::R_386_16:
 676     case elfcpp::R_386_8:
 677       // FIXME: If we are generating a shared object we need to copy
 678       // this relocation into the object.
 679       gold_assert(!options.is_shared());
 680       break;
 681
 682     case elfcpp::R_386_PC32:
 683     case elfcpp::R_386_PC16:
 684     case elfcpp::R_386_PC8:
 685       break;
 686
 687     case elfcpp::R_386_GOTOFF:
 688     case elfcpp::R_386_GOTPC:
 689       // We need a GOT section.
 690       target->got_section(&options, symtab, layout);
 691       break;
 692
 693     case elfcpp::R_386_COPY:
 694     case elfcpp::R_386_GLOB_DAT:
 695     case elfcpp::R_386_JUMP_SLOT:
 696     case elfcpp::R_386_RELATIVE:
 697     case elfcpp::R_386_TLS_TPOFF:
 698     case elfcpp::R_386_TLS_DTPMOD32:
 699     case elfcpp::R_386_TLS_DTPOFF32:
 700     case elfcpp::R_386_TLS_TPOFF32:
 701     case elfcpp::R_386_TLS_DESC:
 702       fprintf(stderr, _("%s: %s: unexpected reloc %u in object file\n"),
 703               program_name, object->name().c_str(), r_type);
 704       gold_exit(false);
 705       break;
 706
 707     case elfcpp::R_386_TLS_IE:
 708     case elfcpp::R_386_TLS_GOTIE:
 709     case elfcpp::R_386_TLS_LE:
 710     case elfcpp::R_386_TLS_GD:
 711     case elfcpp::R_386_TLS_LDM:
 712     case elfcpp::R_386_TLS_LDO_32:
 713     case elfcpp::R_386_TLS_IE_32:
 714     case elfcpp::R_386_TLS_LE_32:
 715     case elfcpp::R_386_TLS_GOTDESC:
 716     case elfcpp::R_386_TLS_DESC_CALL:
 717       r_type = Target_i386::optimize_tls_reloc(&options,
 718                                                !options.is_shared(),
 719                                                r_type);
 720       switch (r_type)
 721         {
 722         case elfcpp::R_386_TLS_LE:
 723         case elfcpp::R_386_TLS_LE_32:
 724           // FIXME: If generating a shared object, we need to copy
 725           // this relocation into the object.
 726           gold_assert(!options.is_shared());
 727           break;
 728
 729         case elfcpp::R_386_TLS_IE:
 730         case elfcpp::R_386_TLS_GOTIE:
 731         case elfcpp::R_386_TLS_GD:
 732         case elfcpp::R_386_TLS_LDM:
 733         case elfcpp::R_386_TLS_LDO_32:
 734         case elfcpp::R_386_TLS_IE_32:
 735         case elfcpp::R_386_TLS_GOTDESC:
 736         case elfcpp::R_386_TLS_DESC_CALL:
 737           fprintf(stderr,
 738                   _("%s: %s: unsupported reloc %u against local symbol\n"),
 739                   program_name, object->name().c_str(), r_type);
 740           break;
 741         }
 742       break;
 743
 744     case elfcpp::R_386_GOT32:
 745     case elfcpp::R_386_PLT32:
 746     case elfcpp::R_386_32PLT:
 747     case elfcpp::R_386_TLS_GD_32:
 748     case elfcpp::R_386_TLS_GD_PUSH:
 749     case elfcpp::R_386_TLS_GD_CALL:
 750     case elfcpp::R_386_TLS_GD_POP:
 751     case elfcpp::R_386_TLS_LDM_32:
 752     case elfcpp::R_386_TLS_LDM_PUSH:
 753     case elfcpp::R_386_TLS_LDM_CALL:
 754     case elfcpp::R_386_TLS_LDM_POP:
 755     case elfcpp::R_386_USED_BY_INTEL_200:
 756     default:
 757       fprintf(stderr, _("%s: %s: unsupported reloc %u against local symbol\n"),
 758               program_name, object->name().c_str(), r_type);
 759       break;
 760     }
 761 }
 762
 763 // Scan a relocation for a global symbol.
 764
 765 inline void
 766 Target_i386::Scan::global(const General_options& options,
 767                           Symbol_table* symtab,
 768                           Layout* layout,
 769                           Target_i386* target,
 770                           Sized_relobj<32, false>* object,
 771                           unsigned int data_shndx,
 772                           const elfcpp::Rel<32, false>& reloc,
 773                           unsigned int r_type,
 774                           Symbol* gsym)
 775 {
 776   switch (r_type)
 777     {
 778     case elfcpp::R_386_NONE:
 779     case elfcpp::R_386_GNU_VTINHERIT:
 780     case elfcpp::R_386_GNU_VTENTRY:
 781       break;
 782
 783     case elfcpp::R_386_32:
 784     case elfcpp::R_386_PC32:
 785     case elfcpp::R_386_16:
 786     case elfcpp::R_386_PC16:
 787     case elfcpp::R_386_8:
 788     case elfcpp::R_386_PC8:
 789       // FIXME: If we are generating a shared object we may need to
 790       // copy this relocation into the object.  If this symbol is
 791       // defined in a shared object, we may need to copy this
 792       // relocation in order to avoid a COPY relocation.
 793       gold_assert(!options.is_shared());
 794
 795       if (gsym->is_defined_in_dynobj())
 796         {
 797           // This symbol is defined in a dynamic object.  If it is a
 798           // function, we make a PLT entry.  Otherwise we need to
 799           // either generate a COPY reloc or copy this reloc.
 800           if (gsym->type() == elfcpp::STT_FUNC)
 801             target->make_plt_entry(&options, symtab, layout, gsym);
 802           else
 803             target->copy_reloc(&options, symtab, layout, object, data_shndx,
 804                                gsym, reloc);
 805         }
 806
 807       break;
 808
 809     case elfcpp::R_386_GOT32:
 810       // The symbol requires a GOT entry.
 811       if (target->got_section(&options, symtab, layout)->add_global(gsym))
 812         {
 813           // If this symbol is not fully resolved, we need to add a
 814           // dynamic relocation for it.
 815           if (!gsym->final_value_is_known(&options))
 816             gold_unreachable();
 817         }
 818       break;
 819
 820     case elfcpp::R_386_PLT32:
 821       // If the symbol is fully resolved, this is just a PC32 reloc.
 822       // Otherwise we need a PLT entry.
 823       if (gsym->final_value_is_known(&options))
 824         break;
 825       target->make_plt_entry(&options, symtab, layout, gsym);
 826       break;
 827
 828     case elfcpp::R_386_GOTOFF:
 829     case elfcpp::R_386_GOTPC:
 830       // We need a GOT section.
 831       target->got_section(&options, symtab, layout);
 832       break;
 833
 834     case elfcpp::R_386_COPY:
 835     case elfcpp::R_386_GLOB_DAT:
 836     case elfcpp::R_386_JUMP_SLOT:
 837     case elfcpp::R_386_RELATIVE:
 838     case elfcpp::R_386_TLS_TPOFF:
 839     case elfcpp::R_386_TLS_DTPMOD32:
 840     case elfcpp::R_386_TLS_DTPOFF32:
 841     case elfcpp::R_386_TLS_TPOFF32:
 842     case elfcpp::R_386_TLS_DESC:
 843       fprintf(stderr, _("%s: %s: unexpected reloc %u in object file\n"),
 844               program_name, object->name().c_str(), r_type);
 845       gold_exit(false);
 846       break;
 847
 848     case elfcpp::R_386_TLS_IE:
 849     case elfcpp::R_386_TLS_GOTIE:
 850     case elfcpp::R_386_TLS_LE:
 851     case elfcpp::R_386_TLS_GD:
 852     case elfcpp::R_386_TLS_LDM:
 853     case elfcpp::R_386_TLS_LDO_32:
 854     case elfcpp::R_386_TLS_IE_32:
 855     case elfcpp::R_386_TLS_LE_32:
 856     case elfcpp::R_386_TLS_GOTDESC:
 857     case elfcpp::R_386_TLS_DESC_CALL:
 858       {
 859         const bool is_final = gsym->final_value_is_known(&options);
 860         r_type = Target_i386::optimize_tls_reloc(&options, is_final, r_type);
 861         switch (r_type)
 862           {
 863           case elfcpp::R_386_TLS_LE:
 864           case elfcpp::R_386_TLS_LE_32:
 865             // FIXME: If generating a shared object, we need to copy
 866             // this relocation into the object.
 867             gold_assert(!options.is_shared());
 868             break;
 869
 870           case elfcpp::R_386_TLS_IE:
 871           case elfcpp::R_386_TLS_GOTIE:
 872           case elfcpp::R_386_TLS_GD:
 873           case elfcpp::R_386_TLS_LDM:
 874           case elfcpp::R_386_TLS_LDO_32:
 875           case elfcpp::R_386_TLS_IE_32:
 876           case elfcpp::R_386_TLS_GOTDESC:
 877           case elfcpp::R_386_TLS_DESC_CALL:
 878             fprintf(stderr,
 879                     _("%s: %s: unsupported reloc %u "
 880                       "against global symbol %s\n"),
 881                     program_name, object->name().c_str(), r_type,
 882                     gsym->name());
 883             break;
 884           }
 885       }
 886       break;
 887
 888     case elfcpp::R_386_32PLT:
 889     case elfcpp::R_386_TLS_GD_32:
 890     case elfcpp::R_386_TLS_GD_PUSH:
 891     case elfcpp::R_386_TLS_GD_CALL:
 892     case elfcpp::R_386_TLS_GD_POP:
 893     case elfcpp::R_386_TLS_LDM_32:
 894     case elfcpp::R_386_TLS_LDM_PUSH:
 895     case elfcpp::R_386_TLS_LDM_CALL:
 896     case elfcpp::R_386_TLS_LDM_POP:
 897     case elfcpp::R_386_USED_BY_INTEL_200:
 898     default:
 899       fprintf(stderr,
 900               _("%s: %s: unsupported reloc %u against global symbol %s\n"),
 901               program_name, object->name().c_str(), r_type, gsym->name());
 902       break;
 903     }
 904 }
 905
 906 // Scan relocations for a section.
 907
 908 void
 909 Target_i386::scan_relocs(const General_options& options,
 910                          Symbol_table* symtab,
 911                          Layout* layout,
 912                          Sized_relobj<32, false>* object,
 913                          unsigned int data_shndx,
 914                          unsigned int sh_type,
 915                          const unsigned char* prelocs,
 916                          size_t reloc_count,
 917                          size_t local_symbol_count,
 918                          const unsigned char* plocal_symbols,
 919                          Symbol** global_symbols)
 920 {
 921   if (sh_type == elfcpp::SHT_RELA)
 922     {
 923       fprintf(stderr, _("%s: %s: unsupported RELA reloc section\n"),
 924               program_name, object->name().c_str());
 925       gold_exit(false);
 926     }
 927
 928   gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL,
 929                     Target_i386::Scan>(
 930     options,
 931     symtab,
 932     layout,
 933     this,
 934     object,
 935     data_shndx,
 936     prelocs,
 937     reloc_count,
 938     local_symbol_count,
 939     plocal_symbols,
 940     global_symbols);
 941 }
 942
 943 // Finalize the sections.  This is where we emit any relocs we saved
 944 // in an attempt to avoid generating extra COPY relocs.
 945
 946 void
 947 Target_i386::do_finalize_sections(Layout* layout)
 948 {
 949   if (this->copy_relocs_ == NULL)
 950     return;
 951   if (this->copy_relocs_->any_to_emit())
 952     {
 953       Reloc_section* rel_dyn = this->rel_dyn_section(layout);
 954       this->copy_relocs_->emit(rel_dyn);
 955     }
 956   delete this->copy_relocs_;
 957   this->copy_relocs_ = NULL;
 958 }
 959
 960 // Perform a relocation.
 961
 962 inline bool
 963 Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo,
 964                                 Target_i386* target,
 965                                 size_t relnum,
 966                                 const elfcpp::Rel<32, false>& rel,
 967                                 unsigned int r_type,
 968                                 const Sized_symbol<32>* gsym,
 969                                 elfcpp::Elf_types<32>::Elf_Addr value,
 970                                 unsigned char* view,
 971                                 elfcpp::Elf_types<32>::Elf_Addr address,
 972                                 off_t view_size)
 973 {
 974   if (this->skip_call_tls_get_addr_)
 975     {
 976       if (r_type != elfcpp::R_386_PLT32
 977           || gsym == NULL
 978           || strcmp(gsym->name(), "___tls_get_addr") != 0)
 979         {
 980           fprintf(stderr, _("%s: %s: missing expected TLS relocation\n"),
 981                   program_name,
 982                   relinfo->location(relnum, rel.get_r_offset()).c_str());
 983           gold_exit(false);
 984         }
 985
 986       this->skip_call_tls_get_addr_ = false;
 987
 988       return false;
 989     }
 990
 991   // Pick the value to use for symbols defined in shared objects.
 992   if (gsym != NULL && gsym->is_defined_in_dynobj())
 993     {
 994       if (gsym->has_plt_offset())
 995         address = target->plt_section()->address() + gsym->plt_offset();
 996       else
 997         gold_unreachable();
 998     }
 999
1000   switch (r_type)
1001     {
1002     case elfcpp::R_386_NONE:
1003     case elfcpp::R_386_GNU_VTINHERIT:
1004     case elfcpp::R_386_GNU_VTENTRY:
1005       break;
1006
1007     case elfcpp::R_386_32:
1008       Relocate_functions<32, false>::rel32(view, value);
1009       break;
1010
1011     case elfcpp::R_386_PC32:
1012       Relocate_functions<32, false>::pcrel32(view, value, address);
1013       break;
1014
1015     case elfcpp::R_386_16:
1016       Relocate_functions<32, false>::rel16(view, value);
1017       break;
1018
1019     case elfcpp::R_386_PC16:
1020       Relocate_functions<32, false>::pcrel16(view, value, address);
1021       break;
1022
1023     case elfcpp::R_386_8:
1024       Relocate_functions<32, false>::rel8(view, value);
1025       break;
1026
1027     case elfcpp::R_386_PC8:
1028       Relocate_functions<32, false>::pcrel8(view, value, address);
1029       break;
1030
1031     case elfcpp::R_386_PLT32:
1032       gold_assert(gsym->has_plt_offset()
1033                   || gsym->final_value_is_known(relinfo->options));
1034       Relocate_functions<32, false>::pcrel32(view, value, address);
1035       break;
1036
1037     case elfcpp::R_386_GOT32:
1038       // Local GOT offsets not yet supported.
1039       gold_assert(gsym);
1040       gold_assert(gsym->has_got_offset());
1041       value = gsym->got_offset();
1042       Relocate_functions<32, false>::rel32(view, value);
1043       break;
1044
1045     case elfcpp::R_386_GOTOFF:
1046       value -= target->got_section(NULL, NULL, NULL)->address();
1047       Relocate_functions<32, false>::rel32(view, value);
1048       break;
1049
1050     case elfcpp::R_386_GOTPC:
1051       value = target->got_section(NULL, NULL, NULL)->address();
1052       Relocate_functions<32, false>::pcrel32(view, value, address);
1053       break;
1054
1055     case elfcpp::R_386_COPY:
1056     case elfcpp::R_386_GLOB_DAT:
1057     case elfcpp::R_386_JUMP_SLOT:
1058     case elfcpp::R_386_RELATIVE:
1059     case elfcpp::R_386_TLS_TPOFF:
1060     case elfcpp::R_386_TLS_DTPMOD32:
1061     case elfcpp::R_386_TLS_DTPOFF32:
1062     case elfcpp::R_386_TLS_TPOFF32:
1063     case elfcpp::R_386_TLS_DESC:
1064       fprintf(stderr, _("%s: %s: unexpected reloc %u in object file\n"),
1065               program_name,
1066               relinfo->location(relnum, rel.get_r_offset()).c_str(),
1067               r_type);
1068       gold_exit(false);
1069       break;
1070
1071     case elfcpp::R_386_TLS_IE:
1072     case elfcpp::R_386_TLS_GOTIE:
1073     case elfcpp::R_386_TLS_LE:
1074     case elfcpp::R_386_TLS_GD:
1075     case elfcpp::R_386_TLS_LDM:
1076     case elfcpp::R_386_TLS_LDO_32:
1077     case elfcpp::R_386_TLS_IE_32:
1078     case elfcpp::R_386_TLS_LE_32:
1079     case elfcpp::R_386_TLS_GOTDESC:
1080     case elfcpp::R_386_TLS_DESC_CALL:
1081       this->relocate_tls(relinfo, relnum, rel, r_type, gsym, value, view,
1082                          address, view_size);
1083       break;
1084
1085     case elfcpp::R_386_32PLT:
1086     case elfcpp::R_386_TLS_GD_32:
1087     case elfcpp::R_386_TLS_GD_PUSH:
1088     case elfcpp::R_386_TLS_GD_CALL:
1089     case elfcpp::R_386_TLS_GD_POP:
1090     case elfcpp::R_386_TLS_LDM_32:
1091     case elfcpp::R_386_TLS_LDM_PUSH:
1092     case elfcpp::R_386_TLS_LDM_CALL:
1093     case elfcpp::R_386_TLS_LDM_POP:
1094     case elfcpp::R_386_USED_BY_INTEL_200:
1095     default:
1096       fprintf(stderr, _("%s: %s: unsupported reloc %u\n"),
1097               program_name,
1098               relinfo->location(relnum, rel.get_r_offset()).c_str(),
1099               r_type);
1100       // gold_exit(false);
1101       break;
1102     }
1103
1104   return true;
1105 }
1106
1107 // Perform a TLS relocation.
1108
1109 inline void
1110 Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo,
1111                                     size_t relnum,
1112                                     const elfcpp::Rel<32, false>& rel,
1113                                     unsigned int r_type,
1114                                     const Sized_symbol<32>* gsym,
1115                                     elfcpp::Elf_types<32>::Elf_Addr value,
1116                                     unsigned char* view,
1117                                     elfcpp::Elf_types<32>::Elf_Addr,
1118                                     off_t view_size)
1119 {
1120   Output_segment* tls_segment = relinfo->layout->tls_segment();
1121   if (tls_segment == NULL)
1122     {
1123       fprintf(stderr, _("%s: %s: TLS reloc but no TLS segment\n"),
1124               program_name,
1125               relinfo->location(relnum, rel.get_r_offset()).c_str());
1126       gold_exit(false);
1127     }
1128
1129   const bool is_final = (gsym == NULL
1130                          ? !relinfo->options->is_shared()
1131                          : gsym->final_value_is_known(relinfo->options));
1132   const unsigned int opt_r_type =
1133     Target_i386::optimize_tls_reloc(relinfo->options, is_final, r_type);
1134   switch (r_type)
1135     {
1136     case elfcpp::R_386_TLS_LE_32:
1137       value = tls_segment->vaddr() + tls_segment->memsz() - value;
1138       Relocate_functions<32, false>::rel32(view, value);
1139       break;
1140
1141     case elfcpp::R_386_TLS_LE:
1142       value = value - (tls_segment->vaddr() + tls_segment->memsz());
1143       Relocate_functions<32, false>::rel32(view, value);
1144       break;
1145
1146     case elfcpp::R_386_TLS_IE:
1147     case elfcpp::R_386_TLS_GOTIE:
1148     case elfcpp::R_386_TLS_IE_32:
1149       if (opt_r_type == elfcpp::R_386_TLS_LE_32)
1150         {
1151           Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment,
1152                                               rel, r_type, value, view,
1153                                               view_size);
1154           break;
1155         }
1156       fprintf(stderr, _("%s: %s: unsupported reloc type %u\n"),
1157               program_name,
1158               relinfo->location(relnum, rel.get_r_offset()).c_str(),
1159               r_type);
1160       // gold_exit(false);
1161       break;
1162
1163     case elfcpp::R_386_TLS_GD:
1164       if (opt_r_type == elfcpp::R_386_TLS_LE_32)
1165         {
1166           this->tls_gd_to_le(relinfo, relnum, tls_segment,
1167                              rel, r_type, value, view,
1168                              view_size);
1169           break;
1170         }
1171       fprintf(stderr, _("%s: %s: unsupported reloc %u\n"),
1172               program_name,
1173               relinfo->location(relnum, rel.get_r_offset()).c_str(),
1174               r_type);
1175       // gold_exit(false);
1176       break;
1177
1178     case elfcpp::R_386_TLS_LDM:
1179     case elfcpp::R_386_TLS_LDO_32:
1180     case elfcpp::R_386_TLS_GOTDESC:
1181     case elfcpp::R_386_TLS_DESC_CALL:
1182       fprintf(stderr, _("%s: %s: unsupported reloc %u\n"),
1183               program_name,
1184               relinfo->location(relnum, rel.get_r_offset()).c_str(),
1185               r_type);
1186       // gold_exit(false);
1187       break;
1188     }
1189 }
1190
1191 // Do a relocation in which we convert a TLS Initial-Exec to a
1192 // Local-Exec.
1193
1194 inline void
1195 Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo,
1196                                     size_t relnum,
1197                                     Output_segment* tls_segment,
1198                                     const elfcpp::Rel<32, false>& rel,
1199                                     unsigned int r_type,
1200                                     elfcpp::Elf_types<32>::Elf_Addr value,
1201                                     unsigned char* view,
1202                                     off_t view_size)
1203 {
1204   // We have to actually change the instructions, which means that we
1205   // need to examine the opcodes to figure out which instruction we
1206   // are looking at.
1207   if (r_type == elfcpp::R_386_TLS_IE)
1208     {
1209       // movl %gs:XX,%eax  ==>  movl $YY,%eax
1210       // movl %gs:XX,%reg  ==>  movl $YY,%reg
1211       // addl %gs:XX,%reg  ==>  addl $YY,%reg
1212       Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, -1);
1213       Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, 4);
1214
1215       unsigned char op1 = view[-1];
1216       if (op1 == 0xa1)
1217         {
1218           // movl XX,%eax  ==>  movl $YY,%eax
1219           view[-1] = 0xb8;
1220         }
1221       else
1222         {
1223           Target_i386::Relocate::check_range(relinfo, relnum, rel,
1224                                              view_size, -2);
1225
1226           unsigned char op2 = view[-2];
1227           if (op2 == 0x8b)
1228             {
1229               // movl XX,%reg  ==>  movl $YY,%reg
1230               Target_i386::Relocate::check_tls(relinfo, relnum, rel,
1231                                                (op1 & 0xc7) == 0x05);
1232               view[-2] = 0xc7;
1233               view[-1] = 0xc0 | ((op1 >> 3) & 7);
1234             }
1235           else if (op2 == 0x03)
1236             {
1237               // addl XX,%reg  ==>  addl $YY,%reg
1238               Target_i386::Relocate::check_tls(relinfo, relnum, rel,
1239                                                (op1 & 0xc7) == 0x05);
1240               view[-2] = 0x81;
1241               view[-1] = 0xc0 | ((op1 >> 3) & 7);
1242             }
1243           else
1244             Target_i386::Relocate::check_tls(relinfo, relnum, rel, 0);
1245         }
1246     }
1247   else
1248     {
1249       // subl %gs:XX(%reg1),%reg2  ==>  subl $YY,%reg2
1250       // movl %gs:XX(%reg1),%reg2  ==>  movl $YY,%reg2
1251       // addl %gs:XX(%reg1),%reg2  ==>  addl $YY,$reg2
1252       Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, -2);
1253       Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, 4);
1254
1255       unsigned char op1 = view[-1];
1256       unsigned char op2 = view[-2];
1257       Target_i386::Relocate::check_tls(relinfo, relnum, rel,
1258                                        (op1 & 0xc0) == 0x80 && (op1 & 7) != 4);
1259       if (op2 == 0x8b)
1260         {
1261           // movl %gs:XX(%reg1),%reg2  ==>  movl $YY,%reg2
1262           view[-2] = 0xc7;
1263           view[-1] = 0xc0 | ((op1 >> 3) & 7);
1264         }
1265       else if (op2 == 0x2b)
1266         {
1267           // subl %gs:XX(%reg1),%reg2  ==>  subl $YY,%reg2
1268           view[-2] = 0x81;
1269           view[-1] = 0xe8 | ((op1 >> 3) & 7);
1270         }
1271       else if (op2 == 0x03)
1272         {
1273           // addl %gs:XX(%reg1),%reg2  ==>  addl $YY,$reg2
1274           view[-2] = 0x81;
1275           view[-1] = 0xc0 | ((op1 >> 3) & 7);
1276         }
1277       else
1278         Target_i386::Relocate::check_tls(relinfo, relnum, rel, 0);
1279     }
1280
1281   value = tls_segment->vaddr() + tls_segment->memsz() - value;
1282   if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE)
1283     value = - value;
1284
1285   Relocate_functions<32, false>::rel32(view, value);
1286 }
1287
1288 // Do a relocation in which we convert a TLS Global-Dynamic to a
1289 // Local-Exec.
1290
1291 inline void
1292 Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo,
1293                                     size_t relnum,
1294                                     Output_segment* tls_segment,
1295                                     const elfcpp::Rel<32, false>& rel,
1296                                     unsigned int,
1297                                     elfcpp::Elf_types<32>::Elf_Addr value,
1298                                     unsigned char* view,
1299                                     off_t view_size)
1300 {
1301   // leal foo(,%reg,1),%eax; call ___tls_get_addr
1302   //  ==> movl %gs,0,%eax; subl $foo@tpoff,%eax
1303   // leal foo(%reg),%eax; call ___tls_get_addr
1304   //  ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
1305
1306   Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, -2);
1307   Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, 9);
1308
1309   unsigned char op1 = view[-1];
1310   unsigned char op2 = view[-2];
1311
1312   Target_i386::Relocate::check_tls(relinfo, relnum, rel,
1313                                    op2 == 0x8d || op2 == 0x04);
1314   Target_i386::Relocate::check_tls(relinfo, relnum, rel,
1315                                    view[4] == 0xe8);
1316
1317   int roff = 5;
1318
1319   if (op2 == 0x04)
1320     {
1321       Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, -3);
1322       Target_i386::Relocate::check_tls(relinfo, relnum, rel,
1323                                        view[-3] == 0x8d);
1324       Target_i386::Relocate::check_tls(relinfo, relnum, rel,
1325                                        ((op1 & 0xc7) == 0x05
1326                                         && op1 != (4 << 3)));
1327       memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
1328     }
1329   else
1330     {
1331       Target_i386::Relocate::check_tls(relinfo, relnum, rel,
1332                                        (op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
1333       if (rel.get_r_offset() + 9 < view_size && view[9] == 0x90)
1334         {
1335           // There is a trailing nop.  Use the size byte subl.
1336           memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
1337           roff = 6;
1338         }
1339       else
1340         {
1341           // Use the five byte subl.
1342           memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
1343         }
1344     }
1345
1346   value = tls_segment->vaddr() + tls_segment->memsz() - value;
1347   Relocate_functions<32, false>::rel32(view + roff, value);
1348
1349   // The next reloc should be a PLT32 reloc against __tls_get_addr.
1350   // We can skip it.
1351   this->skip_call_tls_get_addr_ = true;
1352 }
1353
1354 // Check the range for a TLS relocation.
1355
1356 inline void
1357 Target_i386::Relocate::check_range(const Relocate_info<32, false>* relinfo,
1358                                    size_t relnum,
1359                                    const elfcpp::Rel<32, false>& rel,
1360                                    off_t view_size, off_t off)
1361 {
1362   off_t offset = rel.get_r_offset() + off;
1363   if (offset < 0 || offset > view_size)
1364     {
1365       fprintf(stderr, _("%s: %s: TLS relocation out of range\n"),
1366               program_name,
1367               relinfo->location(relnum, rel.get_r_offset()).c_str());
1368       gold_exit(false);
1369     }
1370 }
1371
1372 // Check the validity of a TLS relocation.  This is like assert.
1373
1374 inline void
1375 Target_i386::Relocate::check_tls(const Relocate_info<32, false>* relinfo,
1376                                  size_t relnum,
1377                                  const elfcpp::Rel<32, false>& rel,
1378                                  bool valid)
1379 {
1380   if (!valid)
1381     {
1382       fprintf(stderr,
1383               _("%s: %s: TLS relocation against invalid instruction\n"),
1384               program_name,
1385               relinfo->location(relnum, rel.get_r_offset()).c_str());
1386       gold_exit(false);
1387     }
1388 }
1389
1390 // Relocate section data.
1391
1392 void
1393 Target_i386::relocate_section(const Relocate_info<32, false>* relinfo,
1394                               unsigned int sh_type,
1395                               const unsigned char* prelocs,
1396                               size_t reloc_count,
1397                               unsigned char* view,
1398                               elfcpp::Elf_types<32>::Elf_Addr address,
1399                               off_t view_size)
1400 {
1401   gold_assert(sh_type == elfcpp::SHT_REL);
1402
1403   gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL,
1404                          Target_i386::Relocate>(
1405     relinfo,
1406     this,
1407     prelocs,
1408     reloc_count,
1409     view,
1410     address,
1411     view_size);
1412 }
1413
1414 // The selector for i386 object files.
1415
1416 class Target_selector_i386 : public Target_selector
1417 {
1418 public:
1419   Target_selector_i386()
1420     : Target_selector(elfcpp::EM_386, 32, false)
1421   { }
1422
1423   Target*
1424   recognize(int machine, int osabi, int abiversion);
1425
1426  private:
1427   Target_i386* target_;
1428 };
1429
1430 // Recognize an i386 object file when we already know that the machine
1431 // number is EM_386.
1432
1433 Target*
1434 Target_selector_i386::recognize(int, int, int)
1435 {
1436   if (this->target_ == NULL)
1437     this->target_ = new Target_i386();
1438   return this->target_;
1439 }
1440
1441 Target_selector_i386 target_selector_i386;
1442
1443 } // End anonymous namespace.