gold/powerpc.cc

   1 // powerpc.cc -- powerpc target support for gold.
   2
   3 // Copyright 2008, 2009 Free Software Foundation, Inc.
   4 // Written by David S. Miller <davem@davemloft.net>
   5 //        and David Edelsohn <edelsohn@gnu.org>
   6
   7 // This file is part of gold.
   8
   9 // This program is free software; you can redistribute it and/or modify
  10 // it under the terms of the GNU General Public License as published by
  11 // the Free Software Foundation; either version 3 of the License, or
  12 // (at your option) any later version.
  13
  14 // This program is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License
  20 // along with this program; if not, write to the Free Software
  21 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  22 // MA 02110-1301, USA.
  23
  24 #include "gold.h"
  25
  26 #include "elfcpp.h"
  27 #include "parameters.h"
  28 #include "reloc.h"
  29 #include "powerpc.h"
  30 #include "object.h"
  31 #include "symtab.h"
  32 #include "layout.h"
  33 #include "output.h"
  34 #include "copy-relocs.h"
  35 #include "target.h"
  36 #include "target-reloc.h"
  37 #include "target-select.h"
  38 #include "tls.h"
  39 #include "errors.h"
  40 #include "gc.h"
  41
  42 namespace
  43 {
  44
  45 using namespace gold;
  46
  47 template<int size, bool big_endian>
  48 class Output_data_plt_powerpc;
  49
  50 template<int size, bool big_endian>
  51 class Target_powerpc : public Sized_target<size, big_endian>
  52 {
  53  public:
  54   typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section;
  55
  56   Target_powerpc()
  57     : Sized_target<size, big_endian>(&powerpc_info),
  58       got_(NULL), got2_(NULL), toc_(NULL),
  59       plt_(NULL), rela_dyn_(NULL),
  60       copy_relocs_(elfcpp::R_POWERPC_COPY),
  61       dynbss_(NULL), got_mod_index_offset_(-1U)
  62   {
  63   }
  64
  65   // Process the relocations to determine unreferenced sections for
  66   // garbage collection.
  67   void
  68   gc_process_relocs(Symbol_table* symtab,
  69                     Layout* layout,
  70                     Sized_relobj<size, big_endian>* object,
  71                     unsigned int data_shndx,
  72                     unsigned int sh_type,
  73                     const unsigned char* prelocs,
  74                     size_t reloc_count,
  75                     Output_section* output_section,
  76                     bool needs_special_offset_handling,
  77                     size_t local_symbol_count,
  78                     const unsigned char* plocal_symbols);
  79
  80   // Scan the relocations to look for symbol adjustments.
  81   void
  82   scan_relocs(Symbol_table* symtab,
  83               Layout* layout,
  84               Sized_relobj<size, big_endian>* object,
  85               unsigned int data_shndx,
  86               unsigned int sh_type,
  87               const unsigned char* prelocs,
  88               size_t reloc_count,
  89               Output_section* output_section,
  90               bool needs_special_offset_handling,
  91               size_t local_symbol_count,
  92               const unsigned char* plocal_symbols);
  93   // Finalize the sections.
  94   void
  95   do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
  96
  97   // Return the value to use for a dynamic which requires special
  98   // treatment.
  99   uint64_t
 100   do_dynsym_value(const Symbol*) const;
 101
 102   // Relocate a section.
 103   void
 104   relocate_section(const Relocate_info<size, big_endian>*,
 105                    unsigned int sh_type,
 106                    const unsigned char* prelocs,
 107                    size_t reloc_count,
 108                    Output_section* output_section,
 109                    bool needs_special_offset_handling,
 110                    unsigned char* view,
 111                    typename elfcpp::Elf_types<size>::Elf_Addr view_address,
 112                    section_size_type view_size,
 113                    const Reloc_symbol_changes*);
 114
 115   // Scan the relocs during a relocatable link.
 116   void
 117   scan_relocatable_relocs(Symbol_table* symtab,
 118                           Layout* layout,
 119                           Sized_relobj<size, big_endian>* object,
 120                           unsigned int data_shndx,
 121                           unsigned int sh_type,
 122                           const unsigned char* prelocs,
 123                           size_t reloc_count,
 124                           Output_section* output_section,
 125                           bool needs_special_offset_handling,
 126                           size_t local_symbol_count,
 127                           const unsigned char* plocal_symbols,
 128                           Relocatable_relocs*);
 129
 130   // Relocate a section during a relocatable link.
 131   void
 132   relocate_for_relocatable(const Relocate_info<size, big_endian>*,
 133                            unsigned int sh_type,
 134                            const unsigned char* prelocs,
 135                            size_t reloc_count,
 136                            Output_section* output_section,
 137                            off_t offset_in_output_section,
 138                            const Relocatable_relocs*,
 139                            unsigned char* view,
 140                            typename elfcpp::Elf_types<size>::Elf_Addr view_address,
 141                            section_size_type view_size,
 142                            unsigned char* reloc_view,
 143                            section_size_type reloc_view_size);
 144
 145   // Return whether SYM is defined by the ABI.
 146   bool
 147   do_is_defined_by_abi(const Symbol* sym) const
 148   {
 149     return strcmp(sym->name(), "___tls_get_addr") == 0;
 150   }
 151
 152   // Return the size of the GOT section.
 153   section_size_type
 154   got_size()
 155   {
 156     gold_assert(this->got_ != NULL);
 157     return this->got_->data_size();
 158   }
 159
 160  private:
 161
 162   // The class which scans relocations.
 163   class Scan
 164   {
 165   public:
 166     Scan()
 167       : issued_non_pic_error_(false)
 168     { }
 169
 170     inline void
 171     local(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
 172           Sized_relobj<size, big_endian>* object,
 173           unsigned int data_shndx,
 174           Output_section* output_section,
 175           const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
 176           const elfcpp::Sym<size, big_endian>& lsym);
 177
 178     inline void
 179     global(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
 180            Sized_relobj<size, big_endian>* object,
 181            unsigned int data_shndx,
 182            Output_section* output_section,
 183            const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
 184            Symbol* gsym);
 185
 186   private:
 187     static void
 188     unsupported_reloc_local(Sized_relobj<size, big_endian>*,
 189                             unsigned int r_type);
 190
 191     static void
 192     unsupported_reloc_global(Sized_relobj<size, big_endian>*,
 193                              unsigned int r_type, Symbol*);
 194
 195     static void
 196     generate_tls_call(Symbol_table* symtab, Layout* layout,
 197                       Target_powerpc* target);
 198
 199     void
 200     check_non_pic(Relobj*, unsigned int r_type);
 201
 202     // Whether we have issued an error about a non-PIC compilation.
 203     bool issued_non_pic_error_;
 204   };
 205
 206   // The class which implements relocation.
 207   class Relocate
 208   {
 209    public:
 210     // Do a relocation.  Return false if the caller should not issue
 211     // any warnings about this relocation.
 212     inline bool
 213     relocate(const Relocate_info<size, big_endian>*, Target_powerpc*,
 214              Output_section*, size_t relnum,
 215              const elfcpp::Rela<size, big_endian>&,
 216              unsigned int r_type, const Sized_symbol<size>*,
 217              const Symbol_value<size>*,
 218              unsigned char*,
 219              typename elfcpp::Elf_types<size>::Elf_Addr,
 220              section_size_type);
 221
 222    private:
 223     // Do a TLS relocation.
 224     inline void
 225     relocate_tls(const Relocate_info<size, big_endian>*,
 226                  Target_powerpc* target,
 227                  size_t relnum, const elfcpp::Rela<size, big_endian>&,
 228                  unsigned int r_type, const Sized_symbol<size>*,
 229                  const Symbol_value<size>*,
 230                  unsigned char*,
 231                  typename elfcpp::Elf_types<size>::Elf_Addr,
 232                  section_size_type);
 233   };
 234
 235   // A class which returns the size required for a relocation type,
 236   // used while scanning relocs during a relocatable link.
 237   class Relocatable_size_for_reloc
 238   {
 239    public:
 240     unsigned int
 241     get_size_for_reloc(unsigned int, Relobj*);
 242   };
 243
 244   // Get the GOT section, creating it if necessary.
 245   Output_data_got<size, big_endian>*
 246   got_section(Symbol_table*, Layout*);
 247
 248   Output_data_space*
 249   got2_section() const
 250   {
 251     gold_assert (this->got2_ != NULL);
 252     return this->got2_;
 253   }
 254
 255   // Get the TOC section.
 256   Output_data_space*
 257   toc_section() const
 258   {
 259     gold_assert (this->toc_ != NULL);
 260     return this->toc_;
 261   }
 262
 263   // Create a PLT entry for a global symbol.
 264   void
 265   make_plt_entry(Symbol_table*, Layout*, Symbol*);
 266
 267   // Create a GOT entry for the TLS module index.
 268   unsigned int
 269   got_mod_index_entry(Symbol_table* symtab, Layout* layout,
 270                       Sized_relobj<size, big_endian>* object);
 271
 272   // Get the PLT section.
 273   const Output_data_plt_powerpc<size, big_endian>*
 274   plt_section() const
 275   {
 276     gold_assert(this->plt_ != NULL);
 277     return this->plt_;
 278   }
 279
 280   // Get the dynamic reloc section, creating it if necessary.
 281   Reloc_section*
 282   rela_dyn_section(Layout*);
 283
 284   // Copy a relocation against a global symbol.
 285   void
 286   copy_reloc(Symbol_table* symtab, Layout* layout,
 287              Sized_relobj<size, big_endian>* object,
 288              unsigned int shndx, Output_section* output_section,
 289              Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc)
 290   {
 291     this->copy_relocs_.copy_reloc(symtab, layout,
 292                                   symtab->get_sized_symbol<size>(sym),
 293                                   object, shndx, output_section,
 294                                   reloc, this->rela_dyn_section(layout));
 295   }
 296
 297   // Information about this specific target which we pass to the
 298   // general Target structure.
 299   static Target::Target_info powerpc_info;
 300
 301   // The types of GOT entries needed for this platform.
 302   enum Got_type
 303   {
 304     GOT_TYPE_STANDARD = 0,      // GOT entry for a regular symbol
 305     GOT_TYPE_TLS_OFFSET = 1,    // GOT entry for TLS offset
 306     GOT_TYPE_TLS_PAIR = 2,      // GOT entry for TLS module/offset pair
 307   };
 308
 309   // The GOT section.
 310   Output_data_got<size, big_endian>* got_;
 311   // The GOT2 section.
 312   Output_data_space* got2_;
 313   // The TOC section.
 314   Output_data_space* toc_;
 315   // The PLT section.
 316   Output_data_plt_powerpc<size, big_endian>* plt_;
 317   // The dynamic reloc section.
 318   Reloc_section* rela_dyn_;
 319   // Relocs saved to avoid a COPY reloc.
 320   Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
 321   // Space for variables copied with a COPY reloc.
 322   Output_data_space* dynbss_;
 323   // Offset of the GOT entry for the TLS module index;
 324   unsigned int got_mod_index_offset_;
 325 };
 326
 327 template<>
 328 Target::Target_info Target_powerpc<32, true>::powerpc_info =
 329 {
 330   32,                   // size
 331   true,                 // is_big_endian
 332   elfcpp::EM_PPC,       // machine_code
 333   false,                // has_make_symbol
 334   false,                // has_resolve
 335   false,                // has_code_fill
 336   true,                 // is_default_stack_executable
 337   '\0',                 // wrap_char
 338   "/usr/lib/ld.so.1",   // dynamic_linker
 339   0x10000000,           // default_text_segment_address
 340   64 * 1024,            // abi_pagesize (overridable by -z max-page-size)
 341   4 * 1024,             // common_pagesize (overridable by -z common-page-size)
 342   elfcpp::SHN_UNDEF,    // small_common_shndx
 343   elfcpp::SHN_UNDEF,    // large_common_shndx
 344   0,                    // small_common_section_flags
 345   0,                    // large_common_section_flags
 346   NULL,                 // attributes_section
 347   NULL                  // attributes_vendor
 348 };
 349
 350 template<>
 351 Target::Target_info Target_powerpc<32, false>::powerpc_info =
 352 {
 353   32,                   // size
 354   false,                // is_big_endian
 355   elfcpp::EM_PPC,       // machine_code
 356   false,                // has_make_symbol
 357   false,                // has_resolve
 358   false,                // has_code_fill
 359   true,                 // is_default_stack_executable
 360   '\0',                 // wrap_char
 361   "/usr/lib/ld.so.1",   // dynamic_linker
 362   0x10000000,           // default_text_segment_address
 363   64 * 1024,            // abi_pagesize (overridable by -z max-page-size)
 364   4 * 1024,             // common_pagesize (overridable by -z common-page-size)
 365   elfcpp::SHN_UNDEF,    // small_common_shndx
 366   elfcpp::SHN_UNDEF,    // large_common_shndx
 367   0,                    // small_common_section_flags
 368   0,                    // large_common_section_flags
 369   NULL,                 // attributes_section
 370   NULL                  // attributes_vendor
 371 };
 372
 373 template<>
 374 Target::Target_info Target_powerpc<64, true>::powerpc_info =
 375 {
 376   64,                   // size
 377   true,                 // is_big_endian
 378   elfcpp::EM_PPC64,     // machine_code
 379   false,                // has_make_symbol
 380   false,                // has_resolve
 381   false,                // has_code_fill
 382   true,                 // is_default_stack_executable
 383   '\0',                 // wrap_char
 384   "/usr/lib/ld.so.1",   // dynamic_linker
 385   0x10000000,           // default_text_segment_address
 386   64 * 1024,            // abi_pagesize (overridable by -z max-page-size)
 387   8 * 1024,             // common_pagesize (overridable by -z common-page-size)
 388   elfcpp::SHN_UNDEF,    // small_common_shndx
 389   elfcpp::SHN_UNDEF,    // large_common_shndx
 390   0,                    // small_common_section_flags
 391   0,                    // large_common_section_flags
 392   NULL,                 // attributes_section
 393   NULL                  // attributes_vendor
 394 };
 395
 396 template<>
 397 Target::Target_info Target_powerpc<64, false>::powerpc_info =
 398 {
 399   64,                   // size
 400   false,                // is_big_endian
 401   elfcpp::EM_PPC64,     // machine_code
 402   false,                // has_make_symbol
 403   false,                // has_resolve
 404   false,                // has_code_fill
 405   true,                 // is_default_stack_executable
 406   '\0',                 // wrap_char
 407   "/usr/lib/ld.so.1",   // dynamic_linker
 408   0x10000000,           // default_text_segment_address
 409   64 * 1024,            // abi_pagesize (overridable by -z max-page-size)
 410   8 * 1024,             // common_pagesize (overridable by -z common-page-size)
 411   elfcpp::SHN_UNDEF,    // small_common_shndx
 412   elfcpp::SHN_UNDEF,    // large_common_shndx
 413   0,                    // small_common_section_flags
 414   0,                    // large_common_section_flags
 415   NULL,                 // attributes_section
 416   NULL                  // attributes_vendor
 417 };
 418
 419 template<int size, bool big_endian>
 420 class Powerpc_relocate_functions
 421 {
 422 private:
 423   // Do a simple relocation with the addend in the relocation.
 424   template<int valsize>
 425   static inline void
 426   rela(unsigned char* view,
 427        unsigned int right_shift,
 428        elfcpp::Elf_Xword dst_mask,
 429        typename elfcpp::Swap<size, big_endian>::Valtype value,
 430        typename elfcpp::Swap<size, big_endian>::Valtype addend)
 431   {
 432     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 433     Valtype* wv = reinterpret_cast<Valtype*>(view);
 434     Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
 435     Valtype reloc = ((value + addend) >> right_shift);
 436
 437     val &= ~dst_mask;
 438     reloc &= dst_mask;
 439
 440     elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc);
 441   }
 442
 443   // Do a simple relocation using a symbol value with the addend in
 444   // the relocation.
 445   template<int valsize>
 446   static inline void
 447   rela(unsigned char* view,
 448        unsigned int right_shift,
 449        elfcpp::Elf_Xword dst_mask,
 450        const Sized_relobj<size, big_endian>* object,
 451        const Symbol_value<size>* psymval,
 452        typename elfcpp::Swap<valsize, big_endian>::Valtype addend)
 453   {
 454     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 455     Valtype* wv = reinterpret_cast<Valtype*>(view);
 456     Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
 457     Valtype reloc = (psymval->value(object, addend) >> right_shift);
 458
 459     val &= ~dst_mask;
 460     reloc &= dst_mask;
 461
 462     elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc);
 463   }
 464
 465   // Do a simple relocation using a symbol value with the addend in
 466   // the relocation, unaligned.
 467   template<int valsize>
 468   static inline void
 469   rela_ua(unsigned char* view, unsigned int right_shift,
 470           elfcpp::Elf_Xword dst_mask,
 471           const Sized_relobj<size, big_endian>* object,
 472           const Symbol_value<size>* psymval,
 473           typename elfcpp::Swap<size, big_endian>::Valtype addend)
 474   {
 475     typedef typename elfcpp::Swap_unaligned<valsize,
 476             big_endian>::Valtype Valtype;
 477     unsigned char* wv = view;
 478     Valtype val = elfcpp::Swap_unaligned<valsize, big_endian>::readval(wv);
 479     Valtype reloc = (psymval->value(object, addend) >> right_shift);
 480
 481     val &= ~dst_mask;
 482     reloc &= dst_mask;
 483
 484     elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, val | reloc);
 485   }
 486
 487   // Do a simple PC relative relocation with a Symbol_value with the
 488   // addend in the relocation.
 489   template<int valsize>
 490   static inline void
 491   pcrela(unsigned char* view, unsigned int right_shift,
 492          elfcpp::Elf_Xword dst_mask,
 493          const Sized_relobj<size, big_endian>* object,
 494          const Symbol_value<size>* psymval,
 495          typename elfcpp::Swap<size, big_endian>::Valtype addend,
 496          typename elfcpp::Elf_types<size>::Elf_Addr address)
 497   {
 498     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 499     Valtype* wv = reinterpret_cast<Valtype*>(view);
 500     Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
 501     Valtype reloc = ((psymval->value(object, addend) - address)
 502                      >> right_shift);
 503
 504     val &= ~dst_mask;
 505     reloc &= dst_mask;
 506
 507     elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc);
 508   }
 509
 510   template<int valsize>
 511   static inline void
 512   pcrela_unaligned(unsigned char* view,
 513                    const Sized_relobj<size, big_endian>* object,
 514                    const Symbol_value<size>* psymval,
 515                    typename elfcpp::Swap<size, big_endian>::Valtype addend,
 516                    typename elfcpp::Elf_types<size>::Elf_Addr address)
 517   {
 518     typedef typename elfcpp::Swap_unaligned<valsize,
 519             big_endian>::Valtype Valtype;
 520     unsigned char* wv = view;
 521     Valtype reloc = (psymval->value(object, addend) - address);
 522
 523     elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, reloc);
 524   }
 525
 526   typedef Powerpc_relocate_functions<size, big_endian> This;
 527   typedef Relocate_functions<size, big_endian> This_reloc;
 528 public:
 529   // R_POWERPC_REL32: (Symbol + Addend - Address)
 530   static inline void
 531   rel32(unsigned char* view,
 532         const Sized_relobj<size, big_endian>* object,
 533         const Symbol_value<size>* psymval,
 534         typename elfcpp::Elf_types<size>::Elf_Addr addend,
 535         typename elfcpp::Elf_types<size>::Elf_Addr address)
 536   { This_reloc::pcrela32(view, object, psymval, addend, address); }
 537
 538   // R_POWERPC_REL24: (Symbol + Addend - Address) & 0x3fffffc
 539   static inline void
 540   rel24(unsigned char* view,
 541         const Sized_relobj<size, big_endian>* object,
 542         const Symbol_value<size>* psymval,
 543         typename elfcpp::Elf_types<size>::Elf_Addr addend,
 544         typename elfcpp::Elf_types<size>::Elf_Addr address)
 545   {
 546     This::template pcrela<32>(view, 0, 0x03fffffc, object,
 547                               psymval, addend, address);
 548   }
 549
 550   // R_POWERPC_REL14: (Symbol + Addend - Address) & 0xfffc
 551   static inline void
 552   rel14(unsigned char* view,
 553         const Sized_relobj<size, big_endian>* object,
 554         const Symbol_value<size>* psymval,
 555         typename elfcpp::Elf_types<size>::Elf_Addr addend,
 556         typename elfcpp::Elf_types<size>::Elf_Addr address)
 557   {
 558     This::template pcrela<32>(view, 0, 0x0000fffc, object,
 559                               psymval, addend, address);
 560   }
 561
 562   // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff
 563   static inline void
 564   addr16(unsigned char* view,
 565          typename elfcpp::Elf_types<size>::Elf_Addr value,
 566          typename elfcpp::Elf_types<size>::Elf_Addr addend)
 567   { This_reloc::rela16(view, value, addend); }
 568
 569   static inline void
 570   addr16(unsigned char* view,
 571          const Sized_relobj<size, big_endian>* object,
 572          const Symbol_value<size>* psymval,
 573          typename elfcpp::Elf_types<size>::Elf_Addr addend)
 574   { This_reloc::rela16(view, object, psymval, addend); }
 575
 576   // R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc
 577   static inline void
 578   addr16_ds(unsigned char* view,
 579             typename elfcpp::Elf_types<size>::Elf_Addr value,
 580             typename elfcpp::Elf_types<size>::Elf_Addr addend)
 581   {
 582     This::template rela<16>(view, 0, 0xfffc, value, addend);
 583   }
 584
 585   // R_POWERPC_ADDR16_LO: (Symbol + Addend) & 0xffff
 586   static inline void
 587   addr16_lo(unsigned char* view,
 588          typename elfcpp::Elf_types<size>::Elf_Addr value,
 589          typename elfcpp::Elf_types<size>::Elf_Addr addend)
 590   { This_reloc::rela16(view, value, addend); }
 591
 592   static inline void
 593   addr16_lo(unsigned char* view,
 594             const Sized_relobj<size, big_endian>* object,
 595             const Symbol_value<size>* psymval,
 596             typename elfcpp::Elf_types<size>::Elf_Addr addend)
 597   { This_reloc::rela16(view, object, psymval, addend); }
 598
 599   // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff
 600   static inline void
 601   addr16_hi(unsigned char* view,
 602             typename elfcpp::Elf_types<size>::Elf_Addr value,
 603             typename elfcpp::Elf_types<size>::Elf_Addr addend)
 604   {
 605     This::template rela<16>(view, 16, 0xffff, value, addend);
 606   }
 607
 608   static inline void
 609   addr16_hi(unsigned char* view,
 610             const Sized_relobj<size, big_endian>* object,
 611             const Symbol_value<size>* psymval,
 612             typename elfcpp::Elf_types<size>::Elf_Addr addend)
 613   {
 614     This::template rela<16>(view, 16, 0xffff, object, psymval, addend);
 615   }
 616
 617   // R_POWERPC_ADDR16_HA: Same as R_POWERPC_ADDR16_HI except that if the
 618   //                      final value of the low 16 bits of the
 619   //                      relocation is negative, add one.
 620   static inline void
 621   addr16_ha(unsigned char* view,
 622             typename elfcpp::Elf_types<size>::Elf_Addr value,
 623             typename elfcpp::Elf_types<size>::Elf_Addr addend)
 624   {
 625     typename elfcpp::Elf_types<size>::Elf_Addr reloc;
 626
 627     reloc = value + addend;
 628
 629     if (reloc & 0x8000)
 630       reloc += 0x10000;
 631     reloc >>= 16;
 632
 633     elfcpp::Swap<16, big_endian>::writeval(view, reloc);
 634   }
 635
 636   static inline void
 637   addr16_ha(unsigned char* view,
 638             const Sized_relobj<size, big_endian>* object,
 639             const Symbol_value<size>* psymval,
 640             typename elfcpp::Elf_types<size>::Elf_Addr addend)
 641   {
 642     typename elfcpp::Elf_types<size>::Elf_Addr reloc;
 643
 644     reloc = psymval->value(object, addend);
 645
 646     if (reloc & 0x8000)
 647       reloc += 0x10000;
 648     reloc >>= 16;
 649
 650     elfcpp::Swap<16, big_endian>::writeval(view, reloc);
 651   }
 652
 653   // R_PPC_REL16: (Symbol + Addend - Address) & 0xffff
 654   static inline void
 655   rel16(unsigned char* view,
 656         const Sized_relobj<size, big_endian>* object,
 657         const Symbol_value<size>* psymval,
 658         typename elfcpp::Elf_types<size>::Elf_Addr addend,
 659         typename elfcpp::Elf_types<size>::Elf_Addr address)
 660   { This_reloc::pcrela16(view, object, psymval, addend, address); }
 661
 662   // R_PPC_REL16_LO: (Symbol + Addend - Address) & 0xffff
 663   static inline void
 664   rel16_lo(unsigned char* view,
 665            const Sized_relobj<size, big_endian>* object,
 666            const Symbol_value<size>* psymval,
 667            typename elfcpp::Elf_types<size>::Elf_Addr addend,
 668            typename elfcpp::Elf_types<size>::Elf_Addr address)
 669   { This_reloc::pcrela16(view, object, psymval, addend, address); }
 670
 671   // R_PPC_REL16_HI: ((Symbol + Addend - Address) >> 16) & 0xffff
 672   static inline void
 673   rel16_hi(unsigned char* view,
 674            const Sized_relobj<size, big_endian>* object,
 675            const Symbol_value<size>* psymval,
 676            typename elfcpp::Elf_types<size>::Elf_Addr addend,
 677            typename elfcpp::Elf_types<size>::Elf_Addr address)
 678   {
 679     This::template pcrela<16>(view, 16, 0xffff, object,
 680                               psymval, addend, address);
 681   }
 682
 683   // R_PPC_REL16_HA: Same as R_PPC_REL16_HI except that if the
 684   //                 final value of the low 16 bits of the
 685   //                 relocation is negative, add one.
 686   static inline void
 687   rel16_ha(unsigned char* view,
 688            const Sized_relobj<size, big_endian>* object,
 689            const Symbol_value<size>* psymval,
 690            typename elfcpp::Elf_types<size>::Elf_Addr addend,
 691            typename elfcpp::Elf_types<size>::Elf_Addr address)
 692   {
 693     typename elfcpp::Elf_types<size>::Elf_Addr reloc;
 694
 695     reloc = (psymval->value(object, addend) - address);
 696     if (reloc & 0x8000)
 697       reloc += 0x10000;
 698     reloc >>= 16;
 699
 700     elfcpp::Swap<16, big_endian>::writeval(view, reloc);
 701   }
 702 };
 703
 704 // Get the GOT section, creating it if necessary.
 705
 706 template<int size, bool big_endian>
 707 Output_data_got<size, big_endian>*
 708 Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab,
 709                                               Layout* layout)
 710 {
 711   if (this->got_ == NULL)
 712     {
 713       gold_assert(symtab != NULL && layout != NULL);
 714
 715       this->got_ = new Output_data_got<size, big_endian>();
 716
 717       layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
 718                                       elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
 719                                       this->got_, false, false, false, false);
 720
 721       // Create the GOT2 or TOC in the .got section.
 722       if (size == 32)
 723         {
 724           this->got2_ = new Output_data_space(4, "** GOT2");
 725           layout->add_output_section_data(".got2", elfcpp::SHT_PROGBITS,
 726                                           elfcpp::SHF_ALLOC
 727                                           | elfcpp::SHF_WRITE,
 728                                           this->got2_, false, false, false,
 729                                           false);
 730         }
 731       else
 732         {
 733           this->toc_ = new Output_data_space(8, "** TOC");
 734           layout->add_output_section_data(".toc", elfcpp::SHT_PROGBITS,
 735                                           elfcpp::SHF_ALLOC
 736                                           | elfcpp::SHF_WRITE,
 737                                           this->toc_, false, false, false,
 738                                           false);
 739         }
 740
 741       // Define _GLOBAL_OFFSET_TABLE_ at the start of the .got section.
 742       symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
 743                                     Symbol_table::PREDEFINED,
 744                                     this->got_,
 745                                     0, 0, elfcpp::STT_OBJECT,
 746                                     elfcpp::STB_LOCAL,
 747                                     elfcpp::STV_HIDDEN, 0,
 748                                     false, false);
 749     }
 750
 751   return this->got_;
 752 }
 753
 754 // Get the dynamic reloc section, creating it if necessary.
 755
 756 template<int size, bool big_endian>
 757 typename Target_powerpc<size, big_endian>::Reloc_section*
 758 Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout)
 759 {
 760   if (this->rela_dyn_ == NULL)
 761     {
 762       gold_assert(layout != NULL);
 763       this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
 764       layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
 765                                       elfcpp::SHF_ALLOC, this->rela_dyn_, true,
 766                                       false, false, false);
 767     }
 768   return this->rela_dyn_;
 769 }
 770
 771 // A class to handle the PLT data.
 772
 773 template<int size, bool big_endian>
 774 class Output_data_plt_powerpc : public Output_section_data
 775 {
 776  public:
 777   typedef Output_data_reloc<elfcpp::SHT_RELA, true,
 778                             size, big_endian> Reloc_section;
 779
 780   Output_data_plt_powerpc(Layout*);
 781
 782   // Add an entry to the PLT.
 783   void add_entry(Symbol* gsym);
 784
 785   // Return the .rela.plt section data.
 786   const Reloc_section* rel_plt() const
 787  {
 788     return this->rel_;
 789   }
 790
 791  protected:
 792   void do_adjust_output_section(Output_section* os);
 793
 794  private:
 795   // The size of an entry in the PLT.
 796   static const int base_plt_entry_size = (size == 32 ? 16 : 24);
 797
 798   // Set the final size.
 799   void
 800   set_final_data_size()
 801   {
 802     unsigned int full_count = this->count_ + 4;
 803
 804     this->set_data_size(full_count * base_plt_entry_size);
 805   }
 806
 807   // Write out the PLT data.
 808   void
 809   do_write(Output_file*);
 810
 811   // The reloc section.
 812   Reloc_section* rel_;
 813   // The number of PLT entries.
 814   unsigned int count_;
 815 };
 816
 817 // Create the PLT section.  The ordinary .got section is an argument,
 818 // since we need to refer to the start.
 819
 820 template<int size, bool big_endian>
 821 Output_data_plt_powerpc<size, big_endian>::Output_data_plt_powerpc(Layout* layout)
 822   : Output_section_data(size == 32 ? 4 : 8), count_(0)
 823 {
 824   this->rel_ = new Reloc_section(false);
 825   layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
 826                                   elfcpp::SHF_ALLOC, this->rel_, true, false,
 827                                   false, false);
 828 }
 829
 830 template<int size, bool big_endian>
 831 void
 832 Output_data_plt_powerpc<size, big_endian>::do_adjust_output_section(Output_section* os)
 833 {
 834   os->set_entsize(0);
 835 }
 836
 837 // Add an entry to the PLT.
 838
 839 template<int size, bool big_endian>
 840 void
 841 Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym)
 842 {
 843   gold_assert(!gsym->has_plt_offset());
 844   unsigned int index = this->count_+ + 4;
 845   section_offset_type plt_offset;
 846
 847   if (index < 8192)
 848     plt_offset = index * base_plt_entry_size;
 849   else
 850     gold_unreachable();
 851
 852   gsym->set_plt_offset(plt_offset);
 853
 854   ++this->count_;
 855
 856   gsym->set_needs_dynsym_entry();
 857   this->rel_->add_global(gsym, elfcpp::R_POWERPC_JMP_SLOT, this,
 858                          plt_offset, 0);
 859 }
 860
 861 static const unsigned int addis_11_11     = 0x3d6b0000;
 862 static const unsigned int addis_11_30     = 0x3d7e0000;
 863 static const unsigned int addis_12_12     = 0x3d8c0000;
 864 static const unsigned int addi_11_11      = 0x396b0000;
 865 static const unsigned int add_0_11_11     = 0x7c0b5a14;
 866 static const unsigned int add_11_0_11     = 0x7d605a14;
 867 static const unsigned int b               = 0x48000000;
 868 static const unsigned int bcl_20_31       = 0x429f0005;
 869 static const unsigned int bctr            = 0x4e800420;
 870 static const unsigned int lis_11          = 0x3d600000;
 871 static const unsigned int lis_12          = 0x3d800000;
 872 static const unsigned int lwzu_0_12       = 0x840c0000;
 873 static const unsigned int lwz_0_12        = 0x800c0000;
 874 static const unsigned int lwz_11_11       = 0x816b0000;
 875 static const unsigned int lwz_11_30       = 0x817e0000;
 876 static const unsigned int lwz_12_12       = 0x818c0000;
 877 static const unsigned int mflr_0          = 0x7c0802a6;
 878 static const unsigned int mflr_12         = 0x7d8802a6;
 879 static const unsigned int mtctr_0         = 0x7c0903a6;
 880 static const unsigned int mtctr_11        = 0x7d6903a6;
 881 static const unsigned int mtlr_0          = 0x7c0803a6;
 882 static const unsigned int nop             = 0x60000000;
 883 static const unsigned int sub_11_11_12    = 0x7d6c5850;
 884
 885 static const unsigned int addis_r12_r2    = 0x3d820000;  /* addis %r12,%r2,xxx@ha     */
 886 static const unsigned int std_r2_40r1     = 0xf8410028;  /* std   %r2,40(%r1)         */
 887 static const unsigned int ld_r11_0r12     = 0xe96c0000;  /* ld    %r11,xxx+0@l(%r12)  */
 888 static const unsigned int ld_r2_0r12      = 0xe84c0000;  /* ld    %r2,xxx+8@l(%r12)   */
 889                                                          /* ld    %r11,xxx+16@l(%r12) */
 890
 891
 892 // Write out the PLT.
 893
 894 template<int size, bool big_endian>
 895 void
 896 Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of)
 897 {
 898   const off_t offset = this->offset();
 899   const section_size_type oview_size =
 900     convert_to_section_size_type(this->data_size());
 901   unsigned char* const oview = of->get_output_view(offset, oview_size);
 902   unsigned char* pov = oview;
 903
 904   memset(pov, 0, base_plt_entry_size * 4);
 905   pov += base_plt_entry_size * 4;
 906
 907   unsigned int plt_offset = base_plt_entry_size * 4;
 908   const unsigned int count = this->count_;
 909
 910   if (size == 64)
 911     {
 912       for (unsigned int i = 0; i < count; i++)
 913         {
 914         }
 915     }
 916   else
 917     {
 918       for (unsigned int i = 0; i < count; i++)
 919         {
 920           elfcpp::Swap<32, true>::writeval(pov + 0x00,
 921                                            lwz_11_30 + plt_offset);
 922           elfcpp::Swap<32, true>::writeval(pov + 0x04, mtctr_11);
 923           elfcpp::Swap<32, true>::writeval(pov + 0x08, bctr);
 924           elfcpp::Swap<32, true>::writeval(pov + 0x0c, nop);
 925           pov += base_plt_entry_size;
 926           plt_offset += base_plt_entry_size;
 927         }
 928     }
 929
 930   gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
 931
 932   of->write_output_view(offset, oview_size, oview);
 933 }
 934
 935 // Create a PLT entry for a global symbol.
 936
 937 template<int size, bool big_endian>
 938 void
 939 Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab,
 940                                                  Layout* layout,
 941                                                  Symbol* gsym)
 942 {
 943   if (gsym->has_plt_offset())
 944     return;
 945
 946   if (this->plt_ == NULL)
 947     {
 948       // Create the GOT section first.
 949       this->got_section(symtab, layout);
 950
 951       // Ensure that .rela.dyn always appears before .rela.plt  This is
 952       // necessary due to how, on PowerPC and some other targets, .rela.dyn
 953       // needs to include .rela.plt in it's range.
 954       this->rela_dyn_section(layout);
 955
 956       this->plt_ = new Output_data_plt_powerpc<size, big_endian>(layout);
 957       layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
 958                                       (elfcpp::SHF_ALLOC
 959                                        | elfcpp::SHF_EXECINSTR
 960                                        | elfcpp::SHF_WRITE),
 961                                       this->plt_, false, false, false, false);
 962
 963       // Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section.
 964       symtab->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL,
 965                                     Symbol_table::PREDEFINED,
 966                                     this->plt_,
 967                                     0, 0, elfcpp::STT_OBJECT,
 968                                     elfcpp::STB_LOCAL,
 969                                     elfcpp::STV_HIDDEN, 0,
 970                                     false, false);
 971     }
 972
 973   this->plt_->add_entry(gsym);
 974 }
 975
 976 // Create a GOT entry for the TLS module index.
 977
 978 template<int size, bool big_endian>
 979 unsigned int
 980 Target_powerpc<size, big_endian>::got_mod_index_entry(Symbol_table* symtab,
 981                                                       Layout* layout,
 982                                                       Sized_relobj<size, big_endian>* object)
 983 {
 984   if (this->got_mod_index_offset_ == -1U)
 985     {
 986       gold_assert(symtab != NULL && layout != NULL && object != NULL);
 987       Reloc_section* rela_dyn = this->rela_dyn_section(layout);
 988       Output_data_got<size, big_endian>* got;
 989       unsigned int got_offset;
 990
 991       got = this->got_section(symtab, layout);
 992       got_offset = got->add_constant(0);
 993       rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got,
 994                           got_offset, 0);
 995       got->add_constant(0);
 996       this->got_mod_index_offset_ = got_offset;
 997     }
 998   return this->got_mod_index_offset_;
 999 }
1000
1001 // Optimize the TLS relocation type based on what we know about the
1002 // symbol.  IS_FINAL is true if the final address of this symbol is
1003 // known at link time.
1004
1005 static tls::Tls_optimization
1006 optimize_tls_reloc(bool /* is_final */, int r_type)
1007 {
1008   // If we are generating a shared library, then we can't do anything
1009   // in the linker.
1010   if (parameters->options().shared())
1011     return tls::TLSOPT_NONE;
1012   switch (r_type)
1013     {
1014       // XXX
1015     default:
1016       gold_unreachable();
1017     }
1018 }
1019
1020 // Report an unsupported relocation against a local symbol.
1021
1022 template<int size, bool big_endian>
1023 void
1024 Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local(
1025                         Sized_relobj<size, big_endian>* object,
1026                         unsigned int r_type)
1027 {
1028   gold_error(_("%s: unsupported reloc %u against local symbol"),
1029              object->name().c_str(), r_type);
1030 }
1031
1032 // We are about to emit a dynamic relocation of type R_TYPE.  If the
1033 // dynamic linker does not support it, issue an error.
1034
1035 template<int size, bool big_endian>
1036 void
1037 Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object,
1038                                                       unsigned int r_type)
1039 {
1040   gold_assert(r_type != elfcpp::R_POWERPC_NONE);
1041
1042   // These are the relocation types supported by glibc for both 32-bit
1043   // and 64-bit powerpc.
1044   switch (r_type)
1045     {
1046     case elfcpp::R_POWERPC_RELATIVE:
1047     case elfcpp::R_POWERPC_GLOB_DAT:
1048     case elfcpp::R_POWERPC_DTPMOD:
1049     case elfcpp::R_POWERPC_DTPREL:
1050     case elfcpp::R_POWERPC_TPREL:
1051     case elfcpp::R_POWERPC_JMP_SLOT:
1052     case elfcpp::R_POWERPC_COPY:
1053     case elfcpp::R_POWERPC_ADDR32:
1054     case elfcpp::R_POWERPC_ADDR24:
1055     case elfcpp::R_POWERPC_REL24:
1056       return;
1057
1058     default:
1059       break;
1060     }
1061
1062   if (size == 64)
1063     {
1064       switch (r_type)
1065         {
1066           // These are the relocation types supported only on 64-bit.
1067         case elfcpp::R_PPC64_ADDR64:
1068         case elfcpp::R_PPC64_TPREL16_LO_DS:
1069         case elfcpp::R_PPC64_TPREL16_DS:
1070         case elfcpp::R_POWERPC_TPREL16:
1071         case elfcpp::R_POWERPC_TPREL16_LO:
1072         case elfcpp::R_POWERPC_TPREL16_HI:
1073         case elfcpp::R_POWERPC_TPREL16_HA:
1074         case elfcpp::R_PPC64_TPREL16_HIGHER:
1075         case elfcpp::R_PPC64_TPREL16_HIGHEST:
1076         case elfcpp::R_PPC64_TPREL16_HIGHERA:
1077         case elfcpp::R_PPC64_TPREL16_HIGHESTA:
1078         case elfcpp::R_PPC64_ADDR16_LO_DS:
1079         case elfcpp::R_POWERPC_ADDR16_LO:
1080         case elfcpp::R_POWERPC_ADDR16_HI:
1081         case elfcpp::R_POWERPC_ADDR16_HA:
1082         case elfcpp::R_POWERPC_ADDR30:
1083         case elfcpp::R_PPC64_UADDR64:
1084         case elfcpp::R_POWERPC_UADDR32:
1085         case elfcpp::R_POWERPC_ADDR16:
1086         case elfcpp::R_POWERPC_UADDR16:
1087         case elfcpp::R_PPC64_ADDR16_DS:
1088         case elfcpp::R_PPC64_ADDR16_HIGHER:
1089         case elfcpp::R_PPC64_ADDR16_HIGHEST:
1090         case elfcpp::R_PPC64_ADDR16_HIGHERA:
1091         case elfcpp::R_PPC64_ADDR16_HIGHESTA:
1092         case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
1093         case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
1094         case elfcpp::R_POWERPC_REL32:
1095         case elfcpp::R_PPC64_REL64:
1096           return;
1097
1098         default:
1099           break;
1100         }
1101     }
1102   else
1103     {
1104       switch (r_type)
1105         {
1106           // These are the relocation types supported only on 32-bit.
1107
1108         default:
1109           break;
1110         }
1111     }
1112
1113   // This prevents us from issuing more than one error per reloc
1114   // section.  But we can still wind up issuing more than one
1115   // error per object file.
1116   if (this->issued_non_pic_error_)
1117     return;
1118   gold_assert(parameters->options().output_is_position_independent());
1119   object->error(_("requires unsupported dynamic reloc; "
1120                   "recompile with -fPIC"));
1121   this->issued_non_pic_error_ = true;
1122   return;
1123 }
1124
1125 // Scan a relocation for a local symbol.
1126
1127 template<int size, bool big_endian>
1128 inline void
1129 Target_powerpc<size, big_endian>::Scan::local(
1130                         Symbol_table* symtab,
1131                         Layout* layout,
1132                         Target_powerpc<size, big_endian>* target,
1133                         Sized_relobj<size, big_endian>* object,
1134                         unsigned int data_shndx,
1135                         Output_section* output_section,
1136                         const elfcpp::Rela<size, big_endian>& reloc,
1137                         unsigned int r_type,
1138                         const elfcpp::Sym<size, big_endian>& lsym)
1139 {
1140   switch (r_type)
1141     {
1142     case elfcpp::R_POWERPC_NONE:
1143     case elfcpp::R_POWERPC_GNU_VTINHERIT:
1144     case elfcpp::R_POWERPC_GNU_VTENTRY:
1145       break;
1146
1147     case elfcpp::R_PPC64_ADDR64:
1148     case elfcpp::R_POWERPC_ADDR32:
1149     case elfcpp::R_POWERPC_ADDR16_HA:
1150     case elfcpp::R_POWERPC_ADDR16_LO:
1151       // If building a shared library (or a position-independent
1152       // executable), we need to create a dynamic relocation for
1153       // this location.
1154       if (parameters->options().output_is_position_independent())
1155         {
1156           Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1157
1158           check_non_pic(object, r_type);
1159           if (lsym.get_st_type() != elfcpp::STT_SECTION)
1160             {
1161               unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1162               rela_dyn->add_local(object, r_sym, r_type, output_section,
1163                                   data_shndx, reloc.get_r_offset(),
1164                                   reloc.get_r_addend());
1165             }
1166           else
1167             {
1168               unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1169               gold_assert(lsym.get_st_value() == 0);
1170               rela_dyn->add_local_relative(object, r_sym, r_type,
1171                                            output_section, data_shndx,
1172                                            reloc.get_r_offset(),
1173                                            reloc.get_r_addend());
1174             }
1175         }
1176       break;
1177
1178     case elfcpp::R_POWERPC_REL24:
1179     case elfcpp::R_PPC_LOCAL24PC:
1180     case elfcpp::R_POWERPC_REL32:
1181     case elfcpp::R_PPC_REL16_LO:
1182     case elfcpp::R_PPC_REL16_HA:
1183       break;
1184
1185     case elfcpp::R_POWERPC_GOT16:
1186     case elfcpp::R_POWERPC_GOT16_LO:
1187     case elfcpp::R_POWERPC_GOT16_HI:
1188     case elfcpp::R_POWERPC_GOT16_HA:
1189     case elfcpp::R_PPC64_TOC16:
1190     case elfcpp::R_PPC64_TOC16_LO:
1191     case elfcpp::R_PPC64_TOC16_HI:
1192     case elfcpp::R_PPC64_TOC16_HA:
1193     case elfcpp::R_PPC64_TOC16_DS:
1194     case elfcpp::R_PPC64_TOC16_LO_DS:
1195       {
1196         // The symbol requires a GOT entry.
1197         Output_data_got<size, big_endian>* got;
1198         unsigned int r_sym;
1199
1200         got = target->got_section(symtab, layout);
1201         r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1202
1203         // If we are generating a shared object, we need to add a
1204         // dynamic relocation for this symbol's GOT entry.
1205         if (parameters->options().output_is_position_independent())
1206           {
1207             if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD))
1208               {
1209                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1210                 unsigned int off;
1211
1212                 off = got->add_constant(0);
1213                 object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off);
1214                 rela_dyn->add_local_relative(object, r_sym,
1215                                              elfcpp::R_POWERPC_RELATIVE,
1216                                              got, off, 0);
1217               }
1218           }
1219         else
1220           got->add_local(object, r_sym, GOT_TYPE_STANDARD);
1221       }
1222       break;
1223
1224     case elfcpp::R_PPC64_TOC:
1225       // We need a GOT section.
1226       target->got_section(symtab, layout);
1227       break;
1228
1229       // These are relocations which should only be seen by the
1230       // dynamic linker, and should never be seen here.
1231     case elfcpp::R_POWERPC_COPY:
1232     case elfcpp::R_POWERPC_GLOB_DAT:
1233     case elfcpp::R_POWERPC_JMP_SLOT:
1234     case elfcpp::R_POWERPC_RELATIVE:
1235     case elfcpp::R_POWERPC_DTPMOD:
1236       gold_error(_("%s: unexpected reloc %u in object file"),
1237                  object->name().c_str(), r_type);
1238       break;
1239
1240     default:
1241       unsupported_reloc_local(object, r_type);
1242       break;
1243     }
1244 }
1245
1246 // Report an unsupported relocation against a global symbol.
1247
1248 template<int size, bool big_endian>
1249 void
1250 Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global(
1251                         Sized_relobj<size, big_endian>* object,
1252                         unsigned int r_type,
1253                         Symbol* gsym)
1254 {
1255   gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1256              object->name().c_str(), r_type, gsym->demangled_name().c_str());
1257 }
1258
1259 // Scan a relocation for a global symbol.
1260
1261 template<int size, bool big_endian>
1262 inline void
1263 Target_powerpc<size, big_endian>::Scan::global(
1264                                 Symbol_table* symtab,
1265                                 Layout* layout,
1266                                 Target_powerpc<size, big_endian>* target,
1267                                 Sized_relobj<size, big_endian>* object,
1268                                 unsigned int data_shndx,
1269                                 Output_section* output_section,
1270                                 const elfcpp::Rela<size, big_endian>& reloc,
1271                                 unsigned int r_type,
1272                                 Symbol* gsym)
1273 {
1274   switch (r_type)
1275     {
1276     case elfcpp::R_POWERPC_NONE:
1277     case elfcpp::R_POWERPC_GNU_VTINHERIT:
1278     case elfcpp::R_POWERPC_GNU_VTENTRY:
1279       break;
1280
1281     case elfcpp::R_PPC_PLTREL24:
1282       // If the symbol is fully resolved, this is just a PC32 reloc.
1283       // Otherwise we need a PLT entry.
1284       if (gsym->final_value_is_known())
1285         break;
1286       // If building a shared library, we can also skip the PLT entry
1287       // if the symbol is defined in the output file and is protected
1288       // or hidden.
1289       if (gsym->is_defined()
1290           && !gsym->is_from_dynobj()
1291           && !gsym->is_preemptible())
1292         break;
1293       target->make_plt_entry(symtab, layout, gsym);
1294       break;
1295
1296     case elfcpp::R_POWERPC_ADDR16:
1297     case elfcpp::R_POWERPC_ADDR16_LO:
1298     case elfcpp::R_POWERPC_ADDR16_HI:
1299     case elfcpp::R_POWERPC_ADDR16_HA:
1300     case elfcpp::R_POWERPC_ADDR32:
1301     case elfcpp::R_PPC64_ADDR64:
1302       {
1303         // Make a PLT entry if necessary.
1304         if (gsym->needs_plt_entry())
1305           {
1306             target->make_plt_entry(symtab, layout, gsym);
1307             // Since this is not a PC-relative relocation, we may be
1308             // taking the address of a function. In that case we need to
1309             // set the entry in the dynamic symbol table to the address of
1310             // the PLT entry.
1311             if (gsym->is_from_dynobj() && !parameters->options().shared())
1312               gsym->set_needs_dynsym_value();
1313           }
1314         // Make a dynamic relocation if necessary.
1315         if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF))
1316           {
1317             if (gsym->may_need_copy_reloc())
1318               {
1319                 target->copy_reloc(symtab, layout, object,
1320                                    data_shndx, output_section, gsym, reloc);
1321               }
1322             else if ((r_type == elfcpp::R_POWERPC_ADDR32
1323                       || r_type == elfcpp::R_PPC64_ADDR64)
1324                      && gsym->can_use_relative_reloc(false))
1325               {
1326                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1327                 rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
1328                                               output_section, object,
1329                                               data_shndx, reloc.get_r_offset(),
1330                                               reloc.get_r_addend());
1331               }
1332             else
1333               {
1334                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1335
1336                 check_non_pic(object, r_type);
1337                 if (gsym->is_from_dynobj()
1338                     || gsym->is_undefined()
1339                     || gsym->is_preemptible())
1340                   rela_dyn->add_global(gsym, r_type, output_section,
1341                                        object, data_shndx,
1342                                        reloc.get_r_offset(),
1343                                        reloc.get_r_addend());
1344                 else
1345                   rela_dyn->add_global_relative(gsym, r_type,
1346                                                 output_section, object,
1347                                                 data_shndx,
1348                                                 reloc.get_r_offset(),
1349                                                 reloc.get_r_addend());
1350               }
1351           }
1352       }
1353       break;
1354
1355     case elfcpp::R_POWERPC_REL24:
1356     case elfcpp::R_PPC_LOCAL24PC:
1357     case elfcpp::R_PPC_REL16:
1358     case elfcpp::R_PPC_REL16_LO:
1359     case elfcpp::R_PPC_REL16_HI:
1360     case elfcpp::R_PPC_REL16_HA:
1361       {
1362         if (gsym->needs_plt_entry())
1363           target->make_plt_entry(symtab, layout, gsym);
1364         // Make a dynamic relocation if necessary.
1365         int flags = Symbol::NON_PIC_REF;
1366         if (gsym->type() == elfcpp::STT_FUNC)
1367           flags |= Symbol::FUNCTION_CALL;
1368         if (gsym->needs_dynamic_reloc(flags))
1369           {
1370             if (gsym->may_need_copy_reloc())
1371               {
1372                 target->copy_reloc(symtab, layout, object,
1373                                    data_shndx, output_section, gsym,
1374                                    reloc);
1375               }
1376             else
1377               {
1378                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1379                 check_non_pic(object, r_type);
1380                 rela_dyn->add_global(gsym, r_type, output_section, object,
1381                                      data_shndx, reloc.get_r_offset(),
1382                                      reloc.get_r_addend());
1383               }
1384           }
1385       }
1386       break;
1387
1388     case elfcpp::R_POWERPC_GOT16:
1389     case elfcpp::R_POWERPC_GOT16_LO:
1390     case elfcpp::R_POWERPC_GOT16_HI:
1391     case elfcpp::R_POWERPC_GOT16_HA:
1392     case elfcpp::R_PPC64_TOC16:
1393     case elfcpp::R_PPC64_TOC16_LO:
1394     case elfcpp::R_PPC64_TOC16_HI:
1395     case elfcpp::R_PPC64_TOC16_HA:
1396     case elfcpp::R_PPC64_TOC16_DS:
1397     case elfcpp::R_PPC64_TOC16_LO_DS:
1398       {
1399         // The symbol requires a GOT entry.
1400         Output_data_got<size, big_endian>* got;
1401
1402         got = target->got_section(symtab, layout);
1403         if (gsym->final_value_is_known())
1404           got->add_global(gsym, GOT_TYPE_STANDARD);
1405         else
1406           {
1407             // If this symbol is not fully resolved, we need to add a
1408             // dynamic relocation for it.
1409             Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1410             if (gsym->is_from_dynobj()
1411                 || gsym->is_undefined()
1412                 || gsym->is_preemptible())
1413               got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn,
1414                                         elfcpp::R_POWERPC_GLOB_DAT);
1415             else if (!gsym->has_got_offset(GOT_TYPE_STANDARD))
1416               {
1417                 unsigned int off = got->add_constant(0);
1418
1419                 gsym->set_got_offset(GOT_TYPE_STANDARD, off);
1420                 rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
1421                                               got, off, 0);
1422               }
1423           }
1424       }
1425       break;
1426
1427     case elfcpp::R_PPC64_TOC:
1428       // We need a GOT section.
1429       target->got_section(symtab, layout);
1430       break;
1431
1432     case elfcpp::R_POWERPC_GOT_TPREL16:
1433     case elfcpp::R_POWERPC_TLS:
1434       // XXX TLS
1435       break;
1436
1437       // These are relocations which should only be seen by the
1438       // dynamic linker, and should never be seen here.
1439     case elfcpp::R_POWERPC_COPY:
1440     case elfcpp::R_POWERPC_GLOB_DAT:
1441     case elfcpp::R_POWERPC_JMP_SLOT:
1442     case elfcpp::R_POWERPC_RELATIVE:
1443     case elfcpp::R_POWERPC_DTPMOD:
1444       gold_error(_("%s: unexpected reloc %u in object file"),
1445                  object->name().c_str(), r_type);
1446       break;
1447
1448     default:
1449       unsupported_reloc_global(object, r_type, gsym);
1450       break;
1451     }
1452 }
1453
1454 // Process relocations for gc.
1455
1456 template<int size, bool big_endian>
1457 void
1458 Target_powerpc<size, big_endian>::gc_process_relocs(
1459                         Symbol_table* symtab,
1460                         Layout* layout,
1461                         Sized_relobj<size, big_endian>* object,
1462                         unsigned int data_shndx,
1463                         unsigned int,
1464                         const unsigned char* prelocs,
1465                         size_t reloc_count,
1466                         Output_section* output_section,
1467                         bool needs_special_offset_handling,
1468                         size_t local_symbol_count,
1469                         const unsigned char* plocal_symbols)
1470 {
1471   typedef Target_powerpc<size, big_endian> Powerpc;
1472   typedef typename Target_powerpc<size, big_endian>::Scan Scan;
1473
1474   gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
1475     symtab,
1476     layout,
1477     this,
1478     object,
1479     data_shndx,
1480     prelocs,
1481     reloc_count,
1482     output_section,
1483     needs_special_offset_handling,
1484     local_symbol_count,
1485     plocal_symbols);
1486 }
1487
1488 // Scan relocations for a section.
1489
1490 template<int size, bool big_endian>
1491 void
1492 Target_powerpc<size, big_endian>::scan_relocs(
1493                         Symbol_table* symtab,
1494                         Layout* layout,
1495                         Sized_relobj<size, big_endian>* object,
1496                         unsigned int data_shndx,
1497                         unsigned int sh_type,
1498                         const unsigned char* prelocs,
1499                         size_t reloc_count,
1500                         Output_section* output_section,
1501                         bool needs_special_offset_handling,
1502                         size_t local_symbol_count,
1503                         const unsigned char* plocal_symbols)
1504 {
1505   typedef Target_powerpc<size, big_endian> Powerpc;
1506   typedef typename Target_powerpc<size, big_endian>::Scan Scan;
1507   static Output_data_space* sdata;
1508
1509   if (sh_type == elfcpp::SHT_REL)
1510     {
1511       gold_error(_("%s: unsupported REL reloc section"),
1512                  object->name().c_str());
1513       return;
1514     }
1515
1516   // Define _SDA_BASE_ at the start of the .sdata section.
1517   if (sdata == NULL)
1518   {
1519     // layout->find_output_section(".sdata") == NULL
1520     sdata = new Output_data_space(4, "** sdata");
1521     Output_section* os = layout->add_output_section_data(".sdata", 0,
1522                                                          elfcpp::SHF_ALLOC
1523                                                          | elfcpp::SHF_WRITE,
1524                                                          sdata, false,
1525                                                          false, false, false);
1526     symtab->define_in_output_data("_SDA_BASE_", NULL,
1527                                   Symbol_table::PREDEFINED,
1528                                   os,
1529                                   32768, 0,
1530                                   elfcpp::STT_OBJECT,
1531                                   elfcpp::STB_LOCAL,
1532                                   elfcpp::STV_HIDDEN, 0,
1533                                   false, false);
1534   }
1535
1536   gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
1537     symtab,
1538     layout,
1539     this,
1540     object,
1541     data_shndx,
1542     prelocs,
1543     reloc_count,
1544     output_section,
1545     needs_special_offset_handling,
1546     local_symbol_count,
1547     plocal_symbols);
1548 }
1549
1550 // Finalize the sections.
1551
1552 template<int size, bool big_endian>
1553 void
1554 Target_powerpc<size, big_endian>::do_finalize_sections(
1555     Layout* layout,
1556     const Input_objects*,
1557     Symbol_table*)
1558 {
1559   // Fill in some more dynamic tags.
1560   const Reloc_section* rel_plt = (this->plt_ == NULL
1561                                   ? NULL
1562                                   : this->plt_->rel_plt());
1563   layout->add_target_dynamic_tags(false, this->plt_, rel_plt,
1564                                   this->rela_dyn_, true, size == 32);
1565
1566   // Emit any relocs we saved in an attempt to avoid generating COPY
1567   // relocs.
1568   if (this->copy_relocs_.any_saved_relocs())
1569     this->copy_relocs_.emit(this->rela_dyn_section(layout));
1570 }
1571
1572 // Perform a relocation.
1573
1574 template<int size, bool big_endian>
1575 inline bool
1576 Target_powerpc<size, big_endian>::Relocate::relocate(
1577                         const Relocate_info<size, big_endian>* relinfo,
1578                         Target_powerpc* target,
1579                         Output_section*,
1580                         size_t relnum,
1581                         const elfcpp::Rela<size, big_endian>& rela,
1582                         unsigned int r_type,
1583                         const Sized_symbol<size>* gsym,
1584                         const Symbol_value<size>* psymval,
1585                         unsigned char* view,
1586                         typename elfcpp::Elf_types<size>::Elf_Addr address,
1587                         section_size_type /* view_size */)
1588 {
1589   const unsigned int toc_base_offset = 0x8000;
1590   typedef Powerpc_relocate_functions<size, big_endian> Reloc;
1591
1592   // Pick the value to use for symbols defined in shared objects.
1593   Symbol_value<size> symval;
1594   if (gsym != NULL
1595       && gsym->use_plt_offset(r_type == elfcpp::R_POWERPC_REL24
1596                               || r_type == elfcpp::R_PPC_LOCAL24PC
1597                               || r_type == elfcpp::R_PPC_REL16
1598                               || r_type == elfcpp::R_PPC_REL16_LO
1599                               || r_type == elfcpp::R_PPC_REL16_HI
1600                               || r_type == elfcpp::R_PPC_REL16_HA))
1601     {
1602       elfcpp::Elf_Xword value;
1603
1604       value = target->plt_section()->address() + gsym->plt_offset();
1605
1606       symval.set_output_value(value);
1607
1608       psymval = &symval;
1609     }
1610
1611   const Sized_relobj<size, big_endian>* object = relinfo->object;
1612   elfcpp::Elf_Xword addend = rela.get_r_addend();
1613
1614   // Get the GOT offset if needed.  Unlike i386 and x86_64, our GOT
1615   // pointer points to the beginning, not the end, of the table.
1616   // So we just use the plain offset.
1617   bool have_got_offset = false;
1618   unsigned int got_offset = 0;
1619   unsigned int got2_offset = 0;
1620   switch (r_type)
1621     {
1622     case elfcpp::R_PPC64_TOC16:
1623     case elfcpp::R_PPC64_TOC16_LO:
1624     case elfcpp::R_PPC64_TOC16_HI:
1625     case elfcpp::R_PPC64_TOC16_HA:
1626     case elfcpp::R_PPC64_TOC16_DS:
1627     case elfcpp::R_PPC64_TOC16_LO_DS:
1628         // Subtract the TOC base address.
1629         addend -= target->toc_section()->address() + toc_base_offset;
1630         /* FALLTHRU */
1631
1632     case elfcpp::R_POWERPC_GOT16:
1633     case elfcpp::R_POWERPC_GOT16_LO:
1634     case elfcpp::R_POWERPC_GOT16_HI:
1635     case elfcpp::R_POWERPC_GOT16_HA:
1636     case elfcpp::R_PPC64_GOT16_DS:
1637     case elfcpp::R_PPC64_GOT16_LO_DS:
1638       if (gsym != NULL)
1639         {
1640           gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
1641           got_offset = gsym->got_offset(GOT_TYPE_STANDARD);
1642         }
1643       else
1644         {
1645           unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
1646           gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
1647           got_offset = object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
1648         }
1649       have_got_offset = true;
1650       break;
1651
1652       // R_PPC_PLTREL24 is rather special.  If non-zero,
1653       // the addend specifies the GOT pointer offset within .got2.
1654     case elfcpp::R_PPC_PLTREL24:
1655       if (addend >= 32768)
1656         {
1657           Output_data_space* got2;
1658           got2 = target->got2_section();
1659           got2_offset = got2->offset();
1660           addend += got2_offset;
1661         }
1662       have_got_offset = true;
1663       break;
1664
1665     default:
1666       break;
1667     }
1668
1669   switch (r_type)
1670     {
1671     case elfcpp::R_POWERPC_NONE:
1672     case elfcpp::R_POWERPC_GNU_VTINHERIT:
1673     case elfcpp::R_POWERPC_GNU_VTENTRY:
1674       break;
1675
1676     case elfcpp::R_POWERPC_REL32:
1677       Reloc::rel32(view, object, psymval, addend, address);
1678       break;
1679
1680     case elfcpp::R_POWERPC_REL24:
1681       Reloc::rel24(view, object, psymval, addend, address);
1682       break;
1683
1684     case elfcpp::R_POWERPC_REL14:
1685       Reloc::rel14(view, object, psymval, addend, address);
1686       break;
1687
1688     case elfcpp::R_PPC_PLTREL24:
1689       Reloc::rel24(view, object, psymval, addend, address);
1690       break;
1691
1692     case elfcpp::R_PPC_LOCAL24PC:
1693       Reloc::rel24(view, object, psymval, addend, address);
1694       break;
1695
1696     case elfcpp::R_PPC64_ADDR64:
1697       if (!parameters->options().output_is_position_independent())
1698         Relocate_functions<size, big_endian>::rela64(view, object,
1699                                                      psymval, addend);
1700       break;
1701
1702     case elfcpp::R_POWERPC_ADDR32:
1703       if (!parameters->options().output_is_position_independent())
1704         Relocate_functions<size, big_endian>::rela32(view, object,
1705                                                      psymval, addend);
1706       break;
1707
1708     case elfcpp::R_POWERPC_ADDR16_LO:
1709       Reloc::addr16_lo(view, object, psymval, addend);
1710       break;
1711
1712     case elfcpp::R_POWERPC_ADDR16_HI:
1713       Reloc::addr16_hi(view, object, psymval, addend);
1714       break;
1715
1716     case elfcpp::R_POWERPC_ADDR16_HA:
1717       Reloc::addr16_ha(view, object, psymval, addend);
1718       break;
1719
1720     case elfcpp::R_PPC_REL16_LO:
1721       Reloc::rel16_lo(view, object, psymval, addend, address);
1722       break;
1723
1724     case elfcpp::R_PPC_REL16_HI:
1725       Reloc::rel16_lo(view, object, psymval, addend, address);
1726       break;
1727
1728     case elfcpp::R_PPC_REL16_HA:
1729       Reloc::rel16_ha(view, object, psymval, addend, address);
1730       break;
1731
1732     case elfcpp::R_POWERPC_GOT16:
1733       Reloc::addr16(view, got_offset, addend);
1734       break;
1735
1736     case elfcpp::R_POWERPC_GOT16_LO:
1737       Reloc::addr16_lo(view, got_offset, addend);
1738       break;
1739
1740     case elfcpp::R_POWERPC_GOT16_HI:
1741       Reloc::addr16_hi(view, got_offset, addend);
1742       break;
1743
1744     case elfcpp::R_POWERPC_GOT16_HA:
1745       Reloc::addr16_ha(view, got_offset, addend);
1746       break;
1747
1748     case elfcpp::R_PPC64_TOC16:
1749       Reloc::addr16(view, got_offset, addend);
1750       break;
1751
1752     case elfcpp::R_PPC64_TOC16_LO:
1753       Reloc::addr16_lo(view, got_offset, addend);
1754       break;
1755
1756     case elfcpp::R_PPC64_TOC16_HI:
1757       Reloc::addr16_hi(view, got_offset, addend);
1758       break;
1759
1760     case elfcpp::R_PPC64_TOC16_HA:
1761       Reloc::addr16_ha(view, got_offset, addend);
1762       break;
1763
1764     case elfcpp::R_PPC64_TOC16_DS:
1765     case elfcpp::R_PPC64_TOC16_LO_DS:
1766       Reloc::addr16_ds(view, got_offset, addend);
1767       break;
1768
1769     case elfcpp::R_PPC64_TOC:
1770       {
1771         elfcpp::Elf_types<64>::Elf_Addr value;
1772         value = target->toc_section()->address() + toc_base_offset;
1773         Relocate_functions<64, false>::rela64(view, value, addend);
1774       }
1775       break;
1776
1777     case elfcpp::R_POWERPC_COPY:
1778     case elfcpp::R_POWERPC_GLOB_DAT:
1779     case elfcpp::R_POWERPC_JMP_SLOT:
1780     case elfcpp::R_POWERPC_RELATIVE:
1781       // This is an outstanding tls reloc, which is unexpected when
1782       // linking.
1783     case elfcpp::R_POWERPC_DTPMOD:
1784       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1785                              _("unexpected reloc %u in object file"),
1786                              r_type);
1787       break;
1788
1789     default:
1790       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1791                              _("unsupported reloc %u"),
1792                              r_type);
1793       break;
1794     }
1795
1796   return true;
1797 }
1798
1799 // Perform a TLS relocation.
1800
1801 template<int size, bool big_endian>
1802 inline void
1803 Target_powerpc<size, big_endian>::Relocate::relocate_tls(
1804                         const Relocate_info<size, big_endian>* relinfo,
1805                         Target_powerpc<size, big_endian>* target,
1806                         size_t relnum,
1807                         const elfcpp::Rela<size, big_endian>& rela,
1808                         unsigned int r_type,
1809                         const Sized_symbol<size>* gsym,
1810                         const Symbol_value<size>* psymval,
1811                         unsigned char* view,
1812                         typename elfcpp::Elf_types<size>::Elf_Addr address,
1813                         section_size_type)
1814 {
1815   Output_segment* tls_segment = relinfo->layout->tls_segment();
1816   typedef Powerpc_relocate_functions<size, big_endian> Reloc;
1817   const Sized_relobj<size, big_endian>* object = relinfo->object;
1818
1819   const elfcpp::Elf_Xword addend = rela.get_r_addend();
1820   typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(object, 0);
1821
1822   const bool is_final =
1823     (gsym == NULL
1824      ? !parameters->options().output_is_position_independent()
1825      : gsym->final_value_is_known());
1826   const tls::Tls_optimization optimized_type
1827       = optimize_tls_reloc(is_final, r_type);
1828
1829   switch (r_type)
1830     {
1831       // XXX
1832     }
1833 }
1834
1835 // Relocate section data.
1836
1837 template<int size, bool big_endian>
1838 void
1839 Target_powerpc<size, big_endian>::relocate_section(
1840                         const Relocate_info<size, big_endian>* relinfo,
1841                         unsigned int sh_type,
1842                         const unsigned char* prelocs,
1843                         size_t reloc_count,
1844                         Output_section* output_section,
1845                         bool needs_special_offset_handling,
1846                         unsigned char* view,
1847                         typename elfcpp::Elf_types<size>::Elf_Addr address,
1848                         section_size_type view_size,
1849                         const Reloc_symbol_changes* reloc_symbol_changes)
1850 {
1851   typedef Target_powerpc<size, big_endian> Powerpc;
1852   typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate;
1853
1854   gold_assert(sh_type == elfcpp::SHT_RELA);
1855
1856   gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA,
1857     Powerpc_relocate>(
1858     relinfo,
1859     this,
1860     prelocs,
1861     reloc_count,
1862     output_section,
1863     needs_special_offset_handling,
1864     view,
1865     address,
1866     view_size,
1867     reloc_symbol_changes);
1868 }
1869
1870 // Return the size of a relocation while scanning during a relocatable
1871 // link.
1872
1873 template<int size, bool big_endian>
1874 unsigned int
1875 Target_powerpc<size, big_endian>::Relocatable_size_for_reloc::get_size_for_reloc(
1876     unsigned int,
1877     Relobj*)
1878 {
1879   // We are always SHT_RELA, so we should never get here.
1880   gold_unreachable();
1881   return 0;
1882 }
1883
1884 // Scan the relocs during a relocatable link.
1885
1886 template<int size, bool big_endian>
1887 void
1888 Target_powerpc<size, big_endian>::scan_relocatable_relocs(
1889                         Symbol_table* symtab,
1890                         Layout* layout,
1891                         Sized_relobj<size, big_endian>* object,
1892                         unsigned int data_shndx,
1893                         unsigned int sh_type,
1894                         const unsigned char* prelocs,
1895                         size_t reloc_count,
1896                         Output_section* output_section,
1897                         bool needs_special_offset_handling,
1898                         size_t local_symbol_count,
1899                         const unsigned char* plocal_symbols,
1900                         Relocatable_relocs* rr)
1901 {
1902   gold_assert(sh_type == elfcpp::SHT_RELA);
1903
1904   typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA,
1905     Relocatable_size_for_reloc> Scan_relocatable_relocs;
1906
1907   gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA,
1908       Scan_relocatable_relocs>(
1909     symtab,
1910     layout,
1911     object,
1912     data_shndx,
1913     prelocs,
1914     reloc_count,
1915     output_section,
1916     needs_special_offset_handling,
1917     local_symbol_count,
1918     plocal_symbols,
1919     rr);
1920 }
1921
1922 // Relocate a section during a relocatable link.
1923
1924 template<int size, bool big_endian>
1925 void
1926 Target_powerpc<size, big_endian>::relocate_for_relocatable(
1927     const Relocate_info<size, big_endian>* relinfo,
1928     unsigned int sh_type,
1929     const unsigned char* prelocs,
1930     size_t reloc_count,
1931     Output_section* output_section,
1932     off_t offset_in_output_section,
1933     const Relocatable_relocs* rr,
1934     unsigned char* view,
1935     typename elfcpp::Elf_types<size>::Elf_Addr view_address,
1936     section_size_type view_size,
1937     unsigned char* reloc_view,
1938     section_size_type reloc_view_size)
1939 {
1940   gold_assert(sh_type == elfcpp::SHT_RELA);
1941
1942   gold::relocate_for_relocatable<size, big_endian, elfcpp::SHT_RELA>(
1943     relinfo,
1944     prelocs,
1945     reloc_count,
1946     output_section,
1947     offset_in_output_section,
1948     rr,
1949     view,
1950     view_address,
1951     view_size,
1952     reloc_view,
1953     reloc_view_size);
1954 }
1955
1956 // Return the value to use for a dynamic which requires special
1957 // treatment.  This is how we support equality comparisons of function
1958 // pointers across shared library boundaries, as described in the
1959 // processor specific ABI supplement.
1960
1961 template<int size, bool big_endian>
1962 uint64_t
1963 Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
1964 {
1965   gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
1966   return this->plt_section()->address() + gsym->plt_offset();
1967 }
1968
1969 // The selector for powerpc object files.
1970
1971 template<int size, bool big_endian>
1972 class Target_selector_powerpc : public Target_selector
1973 {
1974 public:
1975   Target_selector_powerpc()
1976     : Target_selector(elfcpp::EM_NONE, size, big_endian,
1977                       (size == 64 ?
1978                        (big_endian ? "elf64-powerpc" : "elf64-powerpcle") :
1979                        (big_endian ? "elf32-powerpc" : "elf32-powerpcle")))
1980   { }
1981
1982   Target* do_recognize(int machine, int, int)
1983   {
1984     switch (size)
1985       {
1986       case 64:
1987         if (machine != elfcpp::EM_PPC64)
1988           return NULL;
1989         break;
1990
1991       case 32:
1992         if (machine != elfcpp::EM_PPC)
1993           return NULL;
1994         break;
1995
1996       default:
1997         return NULL;
1998       }
1999
2000     return this->instantiate_target();
2001   }
2002
2003   Target* do_instantiate_target()
2004   { return new Target_powerpc<size, big_endian>(); }
2005 };
2006
2007 Target_selector_powerpc<32, true> target_selector_ppc32;
2008 Target_selector_powerpc<32, false> target_selector_ppc32le;
2009 Target_selector_powerpc<64, true> target_selector_ppc64;
2010 Target_selector_powerpc<64, false> target_selector_ppc64le;
2011
2012 } // End anonymous namespace.