gold/reloc.h

   1 // reloc.h -- relocate input files for gold   -*- C++ -*-
   2
   3 // Copyright 2006, 2007, 2008, 2009, 2010 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 #ifndef GOLD_RELOC_H
  24 #define GOLD_RELOC_H
  25
  26 #include <vector>
  27 #ifdef HAVE_BYTESWAP_H
  28 #include <byteswap.h>
  29 #endif
  30
  31 #include "elfcpp.h"
  32 #include "workqueue.h"
  33
  34 namespace gold
  35 {
  36
  37 class General_options;
  38 class Object;
  39 class Relobj;
  40 class Read_relocs_data;
  41 class Symbol;
  42 class Layout;
  43 class Output_data;
  44 class Output_section;
  45
  46 template<int size>
  47 class Sized_symbol;
  48
  49 template<int size, bool big_endian>
  50 class Sized_relobj_file;
  51
  52 template<int size>
  53 class Symbol_value;
  54
  55 template<int sh_type, bool dynamic, int size, bool big_endian>
  56 class Output_data_reloc;
  57
  58 // A class to read the relocations for an object file, and then queue
  59 // up a task to see if they require any GOT/PLT/COPY relocations in
  60 // the symbol table.
  61
  62 class Read_relocs : public Task
  63 {
  64  public:
  65   //   THIS_BLOCKER and NEXT_BLOCKER are passed along to a Scan_relocs
  66   // or Gc_process_relocs task, so that they run in a deterministic
  67   // order.
  68   Read_relocs(Symbol_table* symtab, Layout* layout, Relobj* object,
  69               Task_token* this_blocker, Task_token* next_blocker)
  70     : symtab_(symtab), layout_(layout), object_(object),
  71       this_blocker_(this_blocker), next_blocker_(next_blocker)
  72   { }
  73
  74   // The standard Task methods.
  75
  76   Task_token*
  77   is_runnable();
  78
  79   void
  80   locks(Task_locker*);
  81
  82   void
  83   run(Workqueue*);
  84
  85   std::string
  86   get_name() const;
  87
  88  private:
  89   Symbol_table* symtab_;
  90   Layout* layout_;
  91   Relobj* object_;
  92   Task_token* this_blocker_;
  93   Task_token* next_blocker_;
  94 };
  95
  96 // Process the relocs to figure out which sections are garbage.
  97 // Very similar to scan relocs.
  98
  99 class Gc_process_relocs : public Task
 100 {
 101  public:
 102   // THIS_BLOCKER prevents this task from running until the previous
 103   // one is finished.  NEXT_BLOCKER prevents the next task from
 104   // running.
 105   Gc_process_relocs(Symbol_table* symtab, Layout* layout, Relobj* object,
 106                     Read_relocs_data* rd, Task_token* this_blocker,
 107                     Task_token* next_blocker)
 108     : symtab_(symtab), layout_(layout), object_(object), rd_(rd),
 109       this_blocker_(this_blocker), next_blocker_(next_blocker)
 110   { }
 111
 112   ~Gc_process_relocs();
 113
 114   // The standard Task methods.
 115
 116   Task_token*
 117   is_runnable();
 118
 119   void
 120   locks(Task_locker*);
 121
 122   void
 123   run(Workqueue*);
 124
 125   std::string
 126   get_name() const;
 127
 128  private:
 129   Symbol_table* symtab_;
 130   Layout* layout_;
 131   Relobj* object_;
 132   Read_relocs_data* rd_;
 133   Task_token* this_blocker_;
 134   Task_token* next_blocker_;
 135 };
 136
 137 // Scan the relocations for an object to see if they require any
 138 // GOT/PLT/COPY relocations.
 139
 140 class Scan_relocs : public Task
 141 {
 142  public:
 143   // THIS_BLOCKER prevents this task from running until the previous
 144   // one is finished.  NEXT_BLOCKER prevents the next task from
 145   // running.
 146   Scan_relocs(Symbol_table* symtab, Layout* layout, Relobj* object,
 147               Read_relocs_data* rd, Task_token* this_blocker,
 148               Task_token* next_blocker)
 149     : symtab_(symtab), layout_(layout), object_(object), rd_(rd),
 150       this_blocker_(this_blocker), next_blocker_(next_blocker)
 151   { }
 152
 153   ~Scan_relocs();
 154
 155   // The standard Task methods.
 156
 157   Task_token*
 158   is_runnable();
 159
 160   void
 161   locks(Task_locker*);
 162
 163   void
 164   run(Workqueue*);
 165
 166   std::string
 167   get_name() const;
 168
 169  private:
 170   Symbol_table* symtab_;
 171   Layout* layout_;
 172   Relobj* object_;
 173   Read_relocs_data* rd_;
 174   Task_token* this_blocker_;
 175   Task_token* next_blocker_;
 176 };
 177
 178 // A class to perform all the relocations for an object file.
 179
 180 class Relocate_task : public Task
 181 {
 182  public:
 183   Relocate_task(const Symbol_table* symtab, const Layout* layout,
 184                 Relobj* object, Output_file* of,
 185                 Task_token* input_sections_blocker,
 186                 Task_token* output_sections_blocker, Task_token* final_blocker)
 187     : symtab_(symtab), layout_(layout), object_(object), of_(of),
 188       input_sections_blocker_(input_sections_blocker),
 189       output_sections_blocker_(output_sections_blocker),
 190       final_blocker_(final_blocker)
 191   { }
 192
 193   // The standard Task methods.
 194
 195   Task_token*
 196   is_runnable();
 197
 198   void
 199   locks(Task_locker*);
 200
 201   void
 202   run(Workqueue*);
 203
 204   std::string
 205   get_name() const;
 206
 207  private:
 208   const Symbol_table* symtab_;
 209   const Layout* layout_;
 210   Relobj* object_;
 211   Output_file* of_;
 212   Task_token* input_sections_blocker_;
 213   Task_token* output_sections_blocker_;
 214   Task_token* final_blocker_;
 215 };
 216
 217 // During a relocatable link, this class records how relocations
 218 // should be handled for a single input reloc section.  An instance of
 219 // this class is created while scanning relocs, and it is used while
 220 // processing relocs.
 221
 222 class Relocatable_relocs
 223 {
 224  public:
 225   // We use a vector of unsigned char to indicate how the input relocs
 226   // should be handled.  Each element is one of the following values.
 227   // We create this vector when we initially scan the relocations.
 228   enum Reloc_strategy
 229   {
 230     // Copy the input reloc.  Don't modify it other than updating the
 231     // r_offset field and the r_sym part of the r_info field.
 232     RELOC_COPY,
 233     // Copy the input reloc which is against an STT_SECTION symbol.
 234     // Update the r_offset and r_sym part of the r_info field.  Adjust
 235     // the addend by subtracting the value of the old local symbol and
 236     // adding the value of the new local symbol.  The addend is in the
 237     // SHT_RELA reloc and the contents of the data section do not need
 238     // to be changed.
 239     RELOC_ADJUST_FOR_SECTION_RELA,
 240     // Like RELOC_ADJUST_FOR_SECTION_RELA but the addend should not be
 241     // adjusted.
 242     RELOC_ADJUST_FOR_SECTION_0,
 243     // Like RELOC_ADJUST_FOR_SECTION_RELA but the contents of the
 244     // section need to be changed.  The number indicates the number of
 245     // bytes in the addend in the section contents.
 246     RELOC_ADJUST_FOR_SECTION_1,
 247     RELOC_ADJUST_FOR_SECTION_2,
 248     RELOC_ADJUST_FOR_SECTION_4,
 249     RELOC_ADJUST_FOR_SECTION_8,
 250     // Like RELOC_ADJUST_FOR_SECTION_4 but for unaligned relocs.
 251     RELOC_ADJUST_FOR_SECTION_4_UNALIGNED,
 252     // Discard the input reloc--process it completely when relocating
 253     // the data section contents.
 254     RELOC_DISCARD,
 255     // An input reloc which is not discarded, but which requires
 256     // target specific processing in order to update it.
 257     RELOC_SPECIAL
 258   };
 259
 260   Relocatable_relocs()
 261     : reloc_strategies_(), output_reloc_count_(0), posd_(NULL)
 262   { }
 263
 264   // Record the number of relocs.
 265   void
 266   set_reloc_count(size_t reloc_count)
 267   { this->reloc_strategies_.reserve(reloc_count); }
 268
 269   // Record what to do for the next reloc.
 270   void
 271   set_next_reloc_strategy(Reloc_strategy strategy)
 272   {
 273     this->reloc_strategies_.push_back(static_cast<unsigned char>(strategy));
 274     if (strategy != RELOC_DISCARD)
 275       ++this->output_reloc_count_;
 276   }
 277
 278   // Record the Output_data associated with this reloc section.
 279   void
 280   set_output_data(Output_data* posd)
 281   {
 282     gold_assert(this->posd_ == NULL);
 283     this->posd_ = posd;
 284   }
 285
 286   // Return the Output_data associated with this reloc section.
 287   Output_data*
 288   output_data() const
 289   { return this->posd_; }
 290
 291   // Return what to do for reloc I.
 292   Reloc_strategy
 293   strategy(unsigned int i) const
 294   {
 295     gold_assert(i < this->reloc_strategies_.size());
 296     return static_cast<Reloc_strategy>(this->reloc_strategies_[i]);
 297   }
 298
 299   // Return the number of relocations to create in the output file.
 300   size_t
 301   output_reloc_count() const
 302   { return this->output_reloc_count_; }
 303
 304  private:
 305   typedef std::vector<unsigned char> Reloc_strategies;
 306
 307   // The strategies for the input reloc.  There is one entry in this
 308   // vector for each relocation in the input section.
 309   Reloc_strategies reloc_strategies_;
 310   // The number of relocations to be created in the output file.
 311   size_t output_reloc_count_;
 312   // The output data structure associated with this relocation.
 313   Output_data* posd_;
 314 };
 315
 316 // Standard relocation routines which are used on many targets.  Here
 317 // SIZE and BIG_ENDIAN refer to the target, not the relocation type.
 318
 319 template<int size, bool big_endian>
 320 class Relocate_functions
 321 {
 322 private:
 323   // Do a simple relocation with the addend in the section contents.
 324   // VALSIZE is the size of the value.
 325   template<int valsize>
 326   static inline void
 327   rel(unsigned char* view,
 328       typename elfcpp::Swap<valsize, big_endian>::Valtype value)
 329   {
 330     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 331     Valtype* wv = reinterpret_cast<Valtype*>(view);
 332     Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
 333     elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value);
 334   }
 335
 336   // Do a simple relocation using a Symbol_value with the addend in
 337   // the section contents.  VALSIZE is the size of the value to
 338   // relocate.
 339   template<int valsize>
 340   static inline void
 341   rel(unsigned char* view,
 342       const Sized_relobj_file<size, big_endian>* object,
 343       const Symbol_value<size>* psymval)
 344   {
 345     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 346     Valtype* wv = reinterpret_cast<Valtype*>(view);
 347     Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
 348     x = psymval->value(object, x);
 349     elfcpp::Swap<valsize, big_endian>::writeval(wv, x);
 350   }
 351
 352   // Like the above but for relocs at unaligned addresses.
 353   template<int valsize>
 354   static inline void
 355   rel_unaligned(unsigned char* view,
 356                 const Sized_relobj_file<size, big_endian>* object,
 357                 const Symbol_value<size>* psymval)
 358   {
 359     typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
 360         Valtype;
 361     Valtype x = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view);
 362     x = psymval->value(object, x);
 363     elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, x);
 364   }
 365
 366   // Do a simple relocation with the addend in the relocation.
 367   // VALSIZE is the size of the value.
 368   template<int valsize>
 369   static inline void
 370   rela(unsigned char* view,
 371        typename elfcpp::Swap<valsize, big_endian>::Valtype value,
 372        typename elfcpp::Swap<valsize, big_endian>::Valtype addend)
 373   {
 374     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 375     Valtype* wv = reinterpret_cast<Valtype*>(view);
 376     elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend);
 377   }
 378
 379   // Do a simple relocation using a symbol value with the addend in
 380   // the relocation.  VALSIZE is the size of the value.
 381   template<int valsize>
 382   static inline void
 383   rela(unsigned char* view,
 384        const Sized_relobj_file<size, big_endian>* object,
 385        const Symbol_value<size>* psymval,
 386        typename elfcpp::Swap<valsize, big_endian>::Valtype addend)
 387   {
 388     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 389     Valtype* wv = reinterpret_cast<Valtype*>(view);
 390     Valtype x = psymval->value(object, addend);
 391     elfcpp::Swap<valsize, big_endian>::writeval(wv, x);
 392   }
 393
 394   // Do a simple PC relative relocation with the addend in the section
 395   // contents.  VALSIZE is the size of the value.
 396   template<int valsize>
 397   static inline void
 398   pcrel(unsigned char* view,
 399         typename elfcpp::Swap<valsize, big_endian>::Valtype value,
 400         typename elfcpp::Elf_types<size>::Elf_Addr address)
 401   {
 402     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 403     Valtype* wv = reinterpret_cast<Valtype*>(view);
 404     Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
 405     elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address);
 406   }
 407
 408   // Do a simple PC relative relocation with a Symbol_value with the
 409   // addend in the section contents.  VALSIZE is the size of the
 410   // value.
 411   template<int valsize>
 412   static inline void
 413   pcrel(unsigned char* view,
 414         const Sized_relobj_file<size, big_endian>* object,
 415         const Symbol_value<size>* psymval,
 416         typename elfcpp::Elf_types<size>::Elf_Addr address)
 417   {
 418     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 419     Valtype* wv = reinterpret_cast<Valtype*>(view);
 420     Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
 421     x = psymval->value(object, x);
 422     elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address);
 423   }
 424
 425   // Do a simple PC relative relocation with the addend in the
 426   // relocation.  VALSIZE is the size of the value.
 427   template<int valsize>
 428   static inline void
 429   pcrela(unsigned char* view,
 430          typename elfcpp::Swap<valsize, big_endian>::Valtype value,
 431          typename elfcpp::Swap<valsize, big_endian>::Valtype addend,
 432          typename elfcpp::Elf_types<size>::Elf_Addr address)
 433   {
 434     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 435     Valtype* wv = reinterpret_cast<Valtype*>(view);
 436     elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend - address);
 437   }
 438
 439   // Do a simple PC relative relocation with a Symbol_value with the
 440   // addend in the relocation.  VALSIZE is the size of the value.
 441   template<int valsize>
 442   static inline void
 443   pcrela(unsigned char* view,
 444          const Sized_relobj_file<size, big_endian>* object,
 445          const Symbol_value<size>* psymval,
 446          typename elfcpp::Swap<valsize, big_endian>::Valtype addend,
 447          typename elfcpp::Elf_types<size>::Elf_Addr address)
 448   {
 449     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 450     Valtype* wv = reinterpret_cast<Valtype*>(view);
 451     Valtype x = psymval->value(object, addend);
 452     elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address);
 453   }
 454
 455   typedef Relocate_functions<size, big_endian> This;
 456
 457 public:
 458   // Do a simple 8-bit REL relocation with the addend in the section
 459   // contents.
 460   static inline void
 461   rel8(unsigned char* view, unsigned char value)
 462   { This::template rel<8>(view, value); }
 463
 464   static inline void
 465   rel8(unsigned char* view,
 466        const Sized_relobj_file<size, big_endian>* object,
 467        const Symbol_value<size>* psymval)
 468   { This::template rel<8>(view, object, psymval); }
 469
 470   // Do an 8-bit RELA relocation with the addend in the relocation.
 471   static inline void
 472   rela8(unsigned char* view, unsigned char value, unsigned char addend)
 473   { This::template rela<8>(view, value, addend); }
 474
 475   static inline void
 476   rela8(unsigned char* view,
 477         const Sized_relobj_file<size, big_endian>* object,
 478         const Symbol_value<size>* psymval,
 479         unsigned char addend)
 480   { This::template rela<8>(view, object, psymval, addend); }
 481
 482   // Do a simple 8-bit PC relative relocation with the addend in the
 483   // section contents.
 484   static inline void
 485   pcrel8(unsigned char* view, unsigned char value,
 486          typename elfcpp::Elf_types<size>::Elf_Addr address)
 487   { This::template pcrel<8>(view, value, address); }
 488
 489   static inline void
 490   pcrel8(unsigned char* view,
 491          const Sized_relobj_file<size, big_endian>* object,
 492          const Symbol_value<size>* psymval,
 493          typename elfcpp::Elf_types<size>::Elf_Addr address)
 494   { This::template pcrel<8>(view, object, psymval, address); }
 495
 496   // Do a simple 8-bit PC relative RELA relocation with the addend in
 497   // the reloc.
 498   static inline void
 499   pcrela8(unsigned char* view, unsigned char value, unsigned char addend,
 500           typename elfcpp::Elf_types<size>::Elf_Addr address)
 501   { This::template pcrela<8>(view, value, addend, address); }
 502
 503   static inline void
 504   pcrela8(unsigned char* view,
 505           const Sized_relobj_file<size, big_endian>* object,
 506           const Symbol_value<size>* psymval,
 507           unsigned char addend,
 508           typename elfcpp::Elf_types<size>::Elf_Addr address)
 509   { This::template pcrela<8>(view, object, psymval, addend, address); }
 510
 511   // Do a simple 16-bit REL relocation with the addend in the section
 512   // contents.
 513   static inline void
 514   rel16(unsigned char* view, elfcpp::Elf_Half value)
 515   { This::template rel<16>(view, value); }
 516
 517   static inline void
 518   rel16(unsigned char* view,
 519         const Sized_relobj_file<size, big_endian>* object,
 520         const Symbol_value<size>* psymval)
 521   { This::template rel<16>(view, object, psymval); }
 522
 523   // Do an 16-bit RELA relocation with the addend in the relocation.
 524   static inline void
 525   rela16(unsigned char* view, elfcpp::Elf_Half value, elfcpp::Elf_Half addend)
 526   { This::template rela<16>(view, value, addend); }
 527
 528   static inline void
 529   rela16(unsigned char* view,
 530          const Sized_relobj_file<size, big_endian>* object,
 531          const Symbol_value<size>* psymval,
 532          elfcpp::Elf_Half addend)
 533   { This::template rela<16>(view, object, psymval, addend); }
 534
 535   // Do a simple 16-bit PC relative REL relocation with the addend in
 536   // the section contents.
 537   static inline void
 538   pcrel16(unsigned char* view, elfcpp::Elf_Half value,
 539           typename elfcpp::Elf_types<size>::Elf_Addr address)
 540   { This::template pcrel<16>(view, value, address); }
 541
 542   static inline void
 543   pcrel16(unsigned char* view,
 544           const Sized_relobj_file<size, big_endian>* object,
 545           const Symbol_value<size>* psymval,
 546           typename elfcpp::Elf_types<size>::Elf_Addr address)
 547   { This::template pcrel<16>(view, object, psymval, address); }
 548
 549   // Do a simple 16-bit PC relative RELA relocation with the addend in
 550   // the reloc.
 551   static inline void
 552   pcrela16(unsigned char* view, elfcpp::Elf_Half value,
 553            elfcpp::Elf_Half addend,
 554            typename elfcpp::Elf_types<size>::Elf_Addr address)
 555   { This::template pcrela<16>(view, value, addend, address); }
 556
 557   static inline void
 558   pcrela16(unsigned char* view,
 559            const Sized_relobj_file<size, big_endian>* object,
 560            const Symbol_value<size>* psymval,
 561            elfcpp::Elf_Half addend,
 562            typename elfcpp::Elf_types<size>::Elf_Addr address)
 563   { This::template pcrela<16>(view, object, psymval, addend, address); }
 564
 565   // Do a simple 32-bit REL relocation with the addend in the section
 566   // contents.
 567   static inline void
 568   rel32(unsigned char* view, elfcpp::Elf_Word value)
 569   { This::template rel<32>(view, value); }
 570
 571   static inline void
 572   rel32(unsigned char* view,
 573         const Sized_relobj_file<size, big_endian>* object,
 574         const Symbol_value<size>* psymval)
 575   { This::template rel<32>(view, object, psymval); }
 576
 577   // Like above but for relocs at unaligned addresses.
 578   static inline void
 579   rel32_unaligned(unsigned char* view,
 580                   const Sized_relobj_file<size, big_endian>* object,
 581                   const Symbol_value<size>* psymval)
 582   { This::template rel_unaligned<32>(view, object, psymval); }
 583
 584   // Do an 32-bit RELA relocation with the addend in the relocation.
 585   static inline void
 586   rela32(unsigned char* view, elfcpp::Elf_Word value, elfcpp::Elf_Word addend)
 587   { This::template rela<32>(view, value, addend); }
 588
 589   static inline void
 590   rela32(unsigned char* view,
 591          const Sized_relobj_file<size, big_endian>* object,
 592          const Symbol_value<size>* psymval,
 593          elfcpp::Elf_Word addend)
 594   { This::template rela<32>(view, object, psymval, addend); }
 595
 596   // Do a simple 32-bit PC relative REL relocation with the addend in
 597   // the section contents.
 598   static inline void
 599   pcrel32(unsigned char* view, elfcpp::Elf_Word value,
 600           typename elfcpp::Elf_types<size>::Elf_Addr address)
 601   { This::template pcrel<32>(view, value, address); }
 602
 603   static inline void
 604   pcrel32(unsigned char* view,
 605           const Sized_relobj_file<size, big_endian>* object,
 606           const Symbol_value<size>* psymval,
 607           typename elfcpp::Elf_types<size>::Elf_Addr address)
 608   { This::template pcrel<32>(view, object, psymval, address); }
 609
 610   // Do a simple 32-bit PC relative RELA relocation with the addend in
 611   // the relocation.
 612   static inline void
 613   pcrela32(unsigned char* view, elfcpp::Elf_Word value,
 614            elfcpp::Elf_Word addend,
 615            typename elfcpp::Elf_types<size>::Elf_Addr address)
 616   { This::template pcrela<32>(view, value, addend, address); }
 617
 618   static inline void
 619   pcrela32(unsigned char* view,
 620            const Sized_relobj_file<size, big_endian>* object,
 621            const Symbol_value<size>* psymval,
 622            elfcpp::Elf_Word addend,
 623            typename elfcpp::Elf_types<size>::Elf_Addr address)
 624   { This::template pcrela<32>(view, object, psymval, addend, address); }
 625
 626   // Do a simple 64-bit REL relocation with the addend in the section
 627   // contents.
 628   static inline void
 629   rel64(unsigned char* view, elfcpp::Elf_Xword value)
 630   { This::template rel<64>(view, value); }
 631
 632   static inline void
 633   rel64(unsigned char* view,
 634         const Sized_relobj_file<size, big_endian>* object,
 635         const Symbol_value<size>* psymval)
 636   { This::template rel<64>(view, object, psymval); }
 637
 638   // Do a 64-bit RELA relocation with the addend in the relocation.
 639   static inline void
 640   rela64(unsigned char* view, elfcpp::Elf_Xword value,
 641          elfcpp::Elf_Xword addend)
 642   { This::template rela<64>(view, value, addend); }
 643
 644   static inline void
 645   rela64(unsigned char* view,
 646          const Sized_relobj_file<size, big_endian>* object,
 647          const Symbol_value<size>* psymval,
 648          elfcpp::Elf_Xword addend)
 649   { This::template rela<64>(view, object, psymval, addend); }
 650
 651   // Do a simple 64-bit PC relative REL relocation with the addend in
 652   // the section contents.
 653   static inline void
 654   pcrel64(unsigned char* view, elfcpp::Elf_Xword value,
 655           typename elfcpp::Elf_types<size>::Elf_Addr address)
 656   { This::template pcrel<64>(view, value, address); }
 657
 658   static inline void
 659   pcrel64(unsigned char* view,
 660           const Sized_relobj_file<size, big_endian>* object,
 661           const Symbol_value<size>* psymval,
 662           typename elfcpp::Elf_types<size>::Elf_Addr address)
 663   { This::template pcrel<64>(view, object, psymval, address); }
 664
 665   // Do a simple 64-bit PC relative RELA relocation with the addend in
 666   // the relocation.
 667   static inline void
 668   pcrela64(unsigned char* view, elfcpp::Elf_Xword value,
 669            elfcpp::Elf_Xword addend,
 670            typename elfcpp::Elf_types<size>::Elf_Addr address)
 671   { This::template pcrela<64>(view, value, addend, address); }
 672
 673   static inline void
 674   pcrela64(unsigned char* view,
 675            const Sized_relobj_file<size, big_endian>* object,
 676            const Symbol_value<size>* psymval,
 677            elfcpp::Elf_Xword addend,
 678            typename elfcpp::Elf_types<size>::Elf_Addr address)
 679   { This::template pcrela<64>(view, object, psymval, addend, address); }
 680 };
 681
 682 // Track relocations while reading a section.  This lets you ask for
 683 // the relocation at a certain offset, and see how relocs occur
 684 // between points of interest.
 685
 686 template<int size, bool big_endian>
 687 class Track_relocs
 688 {
 689  public:
 690   Track_relocs()
 691     : prelocs_(NULL), len_(0), pos_(0), reloc_size_(0)
 692   { }
 693
 694   // Initialize the Track_relocs object.  OBJECT is the object holding
 695   // the reloc section, RELOC_SHNDX is the section index of the reloc
 696   // section, and RELOC_TYPE is the type of the reloc section
 697   // (elfcpp::SHT_REL or elfcpp::SHT_RELA).  This returns false if
 698   // something went wrong.
 699   bool
 700   initialize(Object* object, unsigned int reloc_shndx,
 701              unsigned int reloc_type);
 702
 703   // Return the offset in the data section to which the next reloc
 704   // applies.  This returns -1 if there is no next reloc.
 705   off_t
 706   next_offset() const;
 707
 708   // Return the symbol index of the next reloc.  This returns -1U if
 709   // there is no next reloc.
 710   unsigned int
 711   next_symndx() const;
 712
 713   // Return the addend of the next reloc.  This returns 0 if there is
 714   // no next reloc.
 715   uint64_t
 716   next_addend() const;
 717
 718   // Advance to OFFSET within the data section, and return the number
 719   // of relocs which would be skipped.
 720   int
 721   advance(off_t offset);
 722
 723  private:
 724   // The contents of the input object's reloc section.
 725   const unsigned char* prelocs_;
 726   // The length of the reloc section.
 727   section_size_type len_;
 728   // Our current position in the reloc section.
 729   section_size_type pos_;
 730   // The size of the relocs in the section.
 731   int reloc_size_;
 732 };
 733
 734 } // End namespace gold.
 735
 736 #endif // !defined(GOLD_RELOC_H)