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);
 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);
 729         }
 730       else
 731         {
 732           this->toc_ = new Output_data_space(8, "** TOC");
 733           layout->add_output_section_data(".toc", elfcpp::SHT_PROGBITS,
 734                                           elfcpp::SHF_ALLOC
 735                                           | elfcpp::SHF_WRITE,
 736                                           this->toc_, false);
 737         }
 738
 739       // Define _GLOBAL_OFFSET_TABLE_ at the start of the .got section.
 740       symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
 741                                     this->got_,
 742                                     0, 0, elfcpp::STT_OBJECT,
 743                                     elfcpp::STB_LOCAL,
 744                                     elfcpp::STV_HIDDEN, 0,
 745                                     false, false);
 746     }
 747
 748   return this->got_;
 749 }
 750
 751 // Get the dynamic reloc section, creating it if necessary.
 752
 753 template<int size, bool big_endian>
 754 typename Target_powerpc<size, big_endian>::Reloc_section*
 755 Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout)
 756 {
 757   if (this->rela_dyn_ == NULL)
 758     {
 759       gold_assert(layout != NULL);
 760       this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
 761       layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
 762                                       elfcpp::SHF_ALLOC, this->rela_dyn_, true);
 763     }
 764   return this->rela_dyn_;
 765 }
 766
 767 // A class to handle the PLT data.
 768
 769 template<int size, bool big_endian>
 770 class Output_data_plt_powerpc : public Output_section_data
 771 {
 772  public:
 773   typedef Output_data_reloc<elfcpp::SHT_RELA, true,
 774                             size, big_endian> Reloc_section;
 775
 776   Output_data_plt_powerpc(Layout*);
 777
 778   // Add an entry to the PLT.
 779   void add_entry(Symbol* gsym);
 780
 781   // Return the .rela.plt section data.
 782   const Reloc_section* rel_plt() const
 783  {
 784     return this->rel_;
 785   }
 786
 787  protected:
 788   void do_adjust_output_section(Output_section* os);
 789
 790  private:
 791   // The size of an entry in the PLT.
 792   static const int base_plt_entry_size = (size == 32 ? 16 : 24);
 793
 794   // Set the final size.
 795   void
 796   set_final_data_size()
 797   {
 798     unsigned int full_count = this->count_ + 4;
 799
 800     this->set_data_size(full_count * base_plt_entry_size);
 801   }
 802
 803   // Write out the PLT data.
 804   void
 805   do_write(Output_file*);
 806
 807   // The reloc section.
 808   Reloc_section* rel_;
 809   // The number of PLT entries.
 810   unsigned int count_;
 811 };
 812
 813 // Create the PLT section.  The ordinary .got section is an argument,
 814 // since we need to refer to the start.
 815
 816 template<int size, bool big_endian>
 817 Output_data_plt_powerpc<size, big_endian>::Output_data_plt_powerpc(Layout* layout)
 818   : Output_section_data(size == 32 ? 4 : 8), count_(0)
 819 {
 820   this->rel_ = new Reloc_section(false);
 821   layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
 822                                   elfcpp::SHF_ALLOC, this->rel_, true);
 823 }
 824
 825 template<int size, bool big_endian>
 826 void
 827 Output_data_plt_powerpc<size, big_endian>::do_adjust_output_section(Output_section* os)
 828 {
 829   os->set_entsize(0);
 830 }
 831
 832 // Add an entry to the PLT.
 833
 834 template<int size, bool big_endian>
 835 void
 836 Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym)
 837 {
 838   gold_assert(!gsym->has_plt_offset());
 839   unsigned int index = this->count_+ + 4;
 840   section_offset_type plt_offset;
 841
 842   if (index < 8192)
 843     plt_offset = index * base_plt_entry_size;
 844   else
 845     gold_unreachable();
 846
 847   gsym->set_plt_offset(plt_offset);
 848
 849   ++this->count_;
 850
 851   gsym->set_needs_dynsym_entry();
 852   this->rel_->add_global(gsym, elfcpp::R_POWERPC_JMP_SLOT, this,
 853                          plt_offset, 0);
 854 }
 855
 856 static const unsigned int addis_11_11     = 0x3d6b0000;
 857 static const unsigned int addis_11_30     = 0x3d7e0000;
 858 static const unsigned int addis_12_12     = 0x3d8c0000;
 859 static const unsigned int addi_11_11      = 0x396b0000;
 860 static const unsigned int add_0_11_11     = 0x7c0b5a14;
 861 static const unsigned int add_11_0_11     = 0x7d605a14;
 862 static const unsigned int b               = 0x48000000;
 863 static const unsigned int bcl_20_31       = 0x429f0005;
 864 static const unsigned int bctr            = 0x4e800420;
 865 static const unsigned int lis_11          = 0x3d600000;
 866 static const unsigned int lis_12          = 0x3d800000;
 867 static const unsigned int lwzu_0_12       = 0x840c0000;
 868 static const unsigned int lwz_0_12        = 0x800c0000;
 869 static const unsigned int lwz_11_11       = 0x816b0000;
 870 static const unsigned int lwz_11_30       = 0x817e0000;
 871 static const unsigned int lwz_12_12       = 0x818c0000;
 872 static const unsigned int mflr_0          = 0x7c0802a6;
 873 static const unsigned int mflr_12         = 0x7d8802a6;
 874 static const unsigned int mtctr_0         = 0x7c0903a6;
 875 static const unsigned int mtctr_11        = 0x7d6903a6;
 876 static const unsigned int mtlr_0          = 0x7c0803a6;
 877 static const unsigned int nop             = 0x60000000;
 878 static const unsigned int sub_11_11_12    = 0x7d6c5850;
 879
 880 static const unsigned int addis_r12_r2    = 0x3d820000;  /* addis %r12,%r2,xxx@ha     */
 881 static const unsigned int std_r2_40r1     = 0xf8410028;  /* std   %r2,40(%r1)         */
 882 static const unsigned int ld_r11_0r12     = 0xe96c0000;  /* ld    %r11,xxx+0@l(%r12)  */
 883 static const unsigned int ld_r2_0r12      = 0xe84c0000;  /* ld    %r2,xxx+8@l(%r12)   */
 884                                                          /* ld    %r11,xxx+16@l(%r12) */
 885
 886
 887 // Write out the PLT.
 888
 889 template<int size, bool big_endian>
 890 void
 891 Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of)
 892 {
 893   const off_t offset = this->offset();
 894   const section_size_type oview_size =
 895     convert_to_section_size_type(this->data_size());
 896   unsigned char* const oview = of->get_output_view(offset, oview_size);
 897   unsigned char* pov = oview;
 898
 899   memset(pov, 0, base_plt_entry_size * 4);
 900   pov += base_plt_entry_size * 4;
 901
 902   unsigned int plt_offset = base_plt_entry_size * 4;
 903   const unsigned int count = this->count_;
 904
 905   if (size == 64)
 906     {
 907       for (unsigned int i = 0; i < count; i++)
 908         {
 909         }
 910     }
 911   else
 912     {
 913       for (unsigned int i = 0; i < count; i++)
 914         {
 915           elfcpp::Swap<32, true>::writeval(pov + 0x00,
 916                                            lwz_11_30 + plt_offset);
 917           elfcpp::Swap<32, true>::writeval(pov + 0x04, mtctr_11);
 918           elfcpp::Swap<32, true>::writeval(pov + 0x08, bctr);
 919           elfcpp::Swap<32, true>::writeval(pov + 0x0c, nop);
 920           pov += base_plt_entry_size;
 921           plt_offset += base_plt_entry_size;
 922         }
 923     }
 924
 925   gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
 926
 927   of->write_output_view(offset, oview_size, oview);
 928 }
 929
 930 // Create a PLT entry for a global symbol.
 931
 932 template<int size, bool big_endian>
 933 void
 934 Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab,
 935                                                  Layout* layout,
 936                                                  Symbol* gsym)
 937 {
 938   if (gsym->has_plt_offset())
 939     return;
 940
 941   if (this->plt_ == NULL)
 942     {
 943       // Create the GOT section first.
 944       this->got_section(symtab, layout);
 945
 946       this->plt_ = new Output_data_plt_powerpc<size, big_endian>(layout);
 947       layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
 948                                       (elfcpp::SHF_ALLOC
 949                                        | elfcpp::SHF_EXECINSTR
 950                                        | elfcpp::SHF_WRITE),
 951                                       this->plt_, false);
 952
 953       // Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section.
 954       symtab->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL,
 955                                     this->plt_,
 956                                     0, 0, elfcpp::STT_OBJECT,
 957                                     elfcpp::STB_LOCAL,
 958                                     elfcpp::STV_HIDDEN, 0,
 959                                     false, false);
 960     }
 961
 962   this->plt_->add_entry(gsym);
 963 }
 964
 965 // Create a GOT entry for the TLS module index.
 966
 967 template<int size, bool big_endian>
 968 unsigned int
 969 Target_powerpc<size, big_endian>::got_mod_index_entry(Symbol_table* symtab,
 970                                                       Layout* layout,
 971                                                       Sized_relobj<size, big_endian>* object)
 972 {
 973   if (this->got_mod_index_offset_ == -1U)
 974     {
 975       gold_assert(symtab != NULL && layout != NULL && object != NULL);
 976       Reloc_section* rela_dyn = this->rela_dyn_section(layout);
 977       Output_data_got<size, big_endian>* got;
 978       unsigned int got_offset;
 979
 980       got = this->got_section(symtab, layout);
 981       got_offset = got->add_constant(0);
 982       rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got,
 983                           got_offset, 0);
 984       got->add_constant(0);
 985       this->got_mod_index_offset_ = got_offset;
 986     }
 987   return this->got_mod_index_offset_;
 988 }
 989
 990 // Optimize the TLS relocation type based on what we know about the
 991 // symbol.  IS_FINAL is true if the final address of this symbol is
 992 // known at link time.
 993
 994 static tls::Tls_optimization
 995 optimize_tls_reloc(bool /* is_final */, int r_type)
 996 {
 997   // If we are generating a shared library, then we can't do anything
 998   // in the linker.
 999   if (parameters->options().shared())
1000     return tls::TLSOPT_NONE;
1001   switch (r_type)
1002     {
1003       // XXX
1004     default:
1005       gold_unreachable();
1006     }
1007 }
1008
1009 // Report an unsupported relocation against a local symbol.
1010
1011 template<int size, bool big_endian>
1012 void
1013 Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local(
1014                         Sized_relobj<size, big_endian>* object,
1015                         unsigned int r_type)
1016 {
1017   gold_error(_("%s: unsupported reloc %u against local symbol"),
1018              object->name().c_str(), r_type);
1019 }
1020
1021 // We are about to emit a dynamic relocation of type R_TYPE.  If the
1022 // dynamic linker does not support it, issue an error.
1023
1024 template<int size, bool big_endian>
1025 void
1026 Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object,
1027                                                       unsigned int r_type)
1028 {
1029   gold_assert(r_type != elfcpp::R_POWERPC_NONE);
1030
1031   // These are the relocation types supported by glibc for both 32-bit
1032   // and 64-bit powerpc.
1033   switch (r_type)
1034     {
1035     case elfcpp::R_POWERPC_RELATIVE:
1036     case elfcpp::R_POWERPC_GLOB_DAT:
1037     case elfcpp::R_POWERPC_DTPMOD:
1038     case elfcpp::R_POWERPC_DTPREL:
1039     case elfcpp::R_POWERPC_TPREL:
1040     case elfcpp::R_POWERPC_JMP_SLOT:
1041     case elfcpp::R_POWERPC_COPY:
1042     case elfcpp::R_POWERPC_ADDR32:
1043     case elfcpp::R_POWERPC_ADDR24:
1044     case elfcpp::R_POWERPC_REL24:
1045       return;
1046
1047     default:
1048       break;
1049     }
1050
1051   if (size == 64)
1052     {
1053       switch (r_type)
1054         {
1055           // These are the relocation types supported only on 64-bit.
1056         case elfcpp::R_PPC64_ADDR64:
1057         case elfcpp::R_PPC64_TPREL16_LO_DS:
1058         case elfcpp::R_PPC64_TPREL16_DS:
1059         case elfcpp::R_POWERPC_TPREL16:
1060         case elfcpp::R_POWERPC_TPREL16_LO:
1061         case elfcpp::R_POWERPC_TPREL16_HI:
1062         case elfcpp::R_POWERPC_TPREL16_HA:
1063         case elfcpp::R_PPC64_TPREL16_HIGHER:
1064         case elfcpp::R_PPC64_TPREL16_HIGHEST:
1065         case elfcpp::R_PPC64_TPREL16_HIGHERA:
1066         case elfcpp::R_PPC64_TPREL16_HIGHESTA:
1067         case elfcpp::R_PPC64_ADDR16_LO_DS:
1068         case elfcpp::R_POWERPC_ADDR16_LO:
1069         case elfcpp::R_POWERPC_ADDR16_HI:
1070         case elfcpp::R_POWERPC_ADDR16_HA:
1071         case elfcpp::R_POWERPC_ADDR30:
1072         case elfcpp::R_PPC64_UADDR64:
1073         case elfcpp::R_POWERPC_UADDR32:
1074         case elfcpp::R_POWERPC_ADDR16:
1075         case elfcpp::R_POWERPC_UADDR16:
1076         case elfcpp::R_PPC64_ADDR16_DS:
1077         case elfcpp::R_PPC64_ADDR16_HIGHER:
1078         case elfcpp::R_PPC64_ADDR16_HIGHEST:
1079         case elfcpp::R_PPC64_ADDR16_HIGHERA:
1080         case elfcpp::R_PPC64_ADDR16_HIGHESTA:
1081         case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
1082         case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
1083         case elfcpp::R_POWERPC_REL32:
1084         case elfcpp::R_PPC64_REL64:
1085           return;
1086
1087         default:
1088           break;
1089         }
1090     }
1091   else
1092     {
1093       switch (r_type)
1094         {
1095           // These are the relocation types supported only on 32-bit.
1096
1097         default:
1098           break;
1099         }
1100     }
1101
1102   // This prevents us from issuing more than one error per reloc
1103   // section.  But we can still wind up issuing more than one
1104   // error per object file.
1105   if (this->issued_non_pic_error_)
1106     return;
1107   gold_assert(parameters->options().output_is_position_independent());
1108   object->error(_("requires unsupported dynamic reloc; "
1109                   "recompile with -fPIC"));
1110   this->issued_non_pic_error_ = true;
1111   return;
1112 }
1113
1114 // Scan a relocation for a local symbol.
1115
1116 template<int size, bool big_endian>
1117 inline void
1118 Target_powerpc<size, big_endian>::Scan::local(
1119                         Symbol_table* symtab,
1120                         Layout* layout,
1121                         Target_powerpc<size, big_endian>* target,
1122                         Sized_relobj<size, big_endian>* object,
1123                         unsigned int data_shndx,
1124                         Output_section* output_section,
1125                         const elfcpp::Rela<size, big_endian>& reloc,
1126                         unsigned int r_type,
1127                         const elfcpp::Sym<size, big_endian>& lsym)
1128 {
1129   switch (r_type)
1130     {
1131     case elfcpp::R_POWERPC_NONE:
1132     case elfcpp::R_POWERPC_GNU_VTINHERIT:
1133     case elfcpp::R_POWERPC_GNU_VTENTRY:
1134       break;
1135
1136     case elfcpp::R_PPC64_ADDR64:
1137     case elfcpp::R_POWERPC_ADDR32:
1138     case elfcpp::R_POWERPC_ADDR16_HA:
1139     case elfcpp::R_POWERPC_ADDR16_LO:
1140       // If building a shared library (or a position-independent
1141       // executable), we need to create a dynamic relocation for
1142       // this location.
1143       if (parameters->options().output_is_position_independent())
1144         {
1145           Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1146
1147           check_non_pic(object, r_type);
1148           if (lsym.get_st_type() != elfcpp::STT_SECTION)
1149             {
1150               unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1151               rela_dyn->add_local(object, r_sym, r_type, output_section,
1152                                   data_shndx, reloc.get_r_offset(),
1153                                   reloc.get_r_addend());
1154             }
1155           else
1156             {
1157               unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1158               gold_assert(lsym.get_st_value() == 0);
1159               rela_dyn->add_local_relative(object, r_sym, r_type,
1160                                            output_section, data_shndx,
1161                                            reloc.get_r_offset(),
1162                                            reloc.get_r_addend());
1163             }
1164         }
1165       break;
1166
1167     case elfcpp::R_POWERPC_REL24:
1168     case elfcpp::R_PPC_LOCAL24PC:
1169     case elfcpp::R_POWERPC_REL32:
1170     case elfcpp::R_PPC_REL16_LO:
1171     case elfcpp::R_PPC_REL16_HA:
1172       break;
1173
1174     case elfcpp::R_POWERPC_GOT16:
1175     case elfcpp::R_POWERPC_GOT16_LO:
1176     case elfcpp::R_POWERPC_GOT16_HI:
1177     case elfcpp::R_POWERPC_GOT16_HA:
1178     case elfcpp::R_PPC64_TOC16:
1179     case elfcpp::R_PPC64_TOC16_LO:
1180     case elfcpp::R_PPC64_TOC16_HI:
1181     case elfcpp::R_PPC64_TOC16_HA:
1182     case elfcpp::R_PPC64_TOC16_DS:
1183     case elfcpp::R_PPC64_TOC16_LO_DS:
1184       {
1185         // The symbol requires a GOT entry.
1186         Output_data_got<size, big_endian>* got;
1187         unsigned int r_sym;
1188
1189         got = target->got_section(symtab, layout);
1190         r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1191
1192         // If we are generating a shared object, we need to add a
1193         // dynamic relocation for this symbol's GOT entry.
1194         if (parameters->options().output_is_position_independent())
1195           {
1196             if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD))
1197               {
1198                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1199                 unsigned int off;
1200
1201                 off = got->add_constant(0);
1202                 object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off);
1203                 rela_dyn->add_local_relative(object, r_sym,
1204                                              elfcpp::R_POWERPC_RELATIVE,
1205                                              got, off, 0);
1206               }
1207           }
1208         else
1209           got->add_local(object, r_sym, GOT_TYPE_STANDARD);
1210       }
1211       break;
1212
1213     case elfcpp::R_PPC64_TOC:
1214       // We need a GOT section.
1215       target->got_section(symtab, layout);
1216       break;
1217
1218       // These are relocations which should only be seen by the
1219       // dynamic linker, and should never be seen here.
1220     case elfcpp::R_POWERPC_COPY:
1221     case elfcpp::R_POWERPC_GLOB_DAT:
1222     case elfcpp::R_POWERPC_JMP_SLOT:
1223     case elfcpp::R_POWERPC_RELATIVE:
1224     case elfcpp::R_POWERPC_DTPMOD:
1225       gold_error(_("%s: unexpected reloc %u in object file"),
1226                  object->name().c_str(), r_type);
1227       break;
1228
1229     default:
1230       unsupported_reloc_local(object, r_type);
1231       break;
1232     }
1233 }
1234
1235 // Report an unsupported relocation against a global symbol.
1236
1237 template<int size, bool big_endian>
1238 void
1239 Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global(
1240                         Sized_relobj<size, big_endian>* object,
1241                         unsigned int r_type,
1242                         Symbol* gsym)
1243 {
1244   gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1245              object->name().c_str(), r_type, gsym->demangled_name().c_str());
1246 }
1247
1248 // Scan a relocation for a global symbol.
1249
1250 template<int size, bool big_endian>
1251 inline void
1252 Target_powerpc<size, big_endian>::Scan::global(
1253                                 Symbol_table* symtab,
1254                                 Layout* layout,
1255                                 Target_powerpc<size, big_endian>* target,
1256                                 Sized_relobj<size, big_endian>* object,
1257                                 unsigned int data_shndx,
1258                                 Output_section* output_section,
1259                                 const elfcpp::Rela<size, big_endian>& reloc,
1260                                 unsigned int r_type,
1261                                 Symbol* gsym)
1262 {
1263   switch (r_type)
1264     {
1265     case elfcpp::R_POWERPC_NONE:
1266     case elfcpp::R_POWERPC_GNU_VTINHERIT:
1267     case elfcpp::R_POWERPC_GNU_VTENTRY:
1268       break;
1269
1270     case elfcpp::R_PPC_PLTREL24:
1271       // If the symbol is fully resolved, this is just a PC32 reloc.
1272       // Otherwise we need a PLT entry.
1273       if (gsym->final_value_is_known())
1274         break;
1275       // If building a shared library, we can also skip the PLT entry
1276       // if the symbol is defined in the output file and is protected
1277       // or hidden.
1278       if (gsym->is_defined()
1279           && !gsym->is_from_dynobj()
1280           && !gsym->is_preemptible())
1281         break;
1282       target->make_plt_entry(symtab, layout, gsym);
1283       break;
1284
1285     case elfcpp::R_POWERPC_ADDR16:
1286     case elfcpp::R_POWERPC_ADDR16_LO:
1287     case elfcpp::R_POWERPC_ADDR16_HI:
1288     case elfcpp::R_POWERPC_ADDR16_HA:
1289     case elfcpp::R_POWERPC_ADDR32:
1290     case elfcpp::R_PPC64_ADDR64:
1291       {
1292         // Make a PLT entry if necessary.
1293         if (gsym->needs_plt_entry())
1294           {
1295             target->make_plt_entry(symtab, layout, gsym);
1296             // Since this is not a PC-relative relocation, we may be
1297             // taking the address of a function. In that case we need to
1298             // set the entry in the dynamic symbol table to the address of
1299             // the PLT entry.
1300             if (gsym->is_from_dynobj() && !parameters->options().shared())
1301               gsym->set_needs_dynsym_value();
1302           }
1303         // Make a dynamic relocation if necessary.
1304         if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF))
1305           {
1306             if (gsym->may_need_copy_reloc())
1307               {
1308                 target->copy_reloc(symtab, layout, object,
1309                                    data_shndx, output_section, gsym, reloc);
1310               }
1311             else if ((r_type == elfcpp::R_POWERPC_ADDR32
1312                       || r_type == elfcpp::R_PPC64_ADDR64)
1313                      && gsym->can_use_relative_reloc(false))
1314               {
1315                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1316                 rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
1317                                               output_section, object,
1318                                               data_shndx, reloc.get_r_offset(),
1319                                               reloc.get_r_addend());
1320               }
1321             else
1322               {
1323                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1324
1325                 check_non_pic(object, r_type);
1326                 if (gsym->is_from_dynobj()
1327                     || gsym->is_undefined()
1328                     || gsym->is_preemptible())
1329                   rela_dyn->add_global(gsym, r_type, output_section,
1330                                        object, data_shndx,
1331                                        reloc.get_r_offset(),
1332                                        reloc.get_r_addend());
1333                 else
1334                   rela_dyn->add_global_relative(gsym, r_type,
1335                                                 output_section, object,
1336                                                 data_shndx,
1337                                                 reloc.get_r_offset(),
1338                                                 reloc.get_r_addend());
1339               }
1340           }
1341       }
1342       break;
1343
1344     case elfcpp::R_POWERPC_REL24:
1345     case elfcpp::R_PPC_LOCAL24PC:
1346     case elfcpp::R_PPC_REL16:
1347     case elfcpp::R_PPC_REL16_LO:
1348     case elfcpp::R_PPC_REL16_HI:
1349     case elfcpp::R_PPC_REL16_HA:
1350       {
1351         if (gsym->needs_plt_entry())
1352           target->make_plt_entry(symtab, layout, gsym);
1353         // Make a dynamic relocation if necessary.
1354         int flags = Symbol::NON_PIC_REF;
1355         if (gsym->type() == elfcpp::STT_FUNC)
1356           flags |= Symbol::FUNCTION_CALL;
1357         if (gsym->needs_dynamic_reloc(flags))
1358           {
1359             if (gsym->may_need_copy_reloc())
1360               {
1361                 target->copy_reloc(symtab, layout, object,
1362                                    data_shndx, output_section, gsym,
1363                                    reloc);
1364               }
1365             else
1366               {
1367                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1368                 check_non_pic(object, r_type);
1369                 rela_dyn->add_global(gsym, r_type, output_section, object,
1370                                      data_shndx, reloc.get_r_offset(),
1371                                      reloc.get_r_addend());
1372               }
1373           }
1374       }
1375       break;
1376
1377     case elfcpp::R_POWERPC_GOT16:
1378     case elfcpp::R_POWERPC_GOT16_LO:
1379     case elfcpp::R_POWERPC_GOT16_HI:
1380     case elfcpp::R_POWERPC_GOT16_HA:
1381     case elfcpp::R_PPC64_TOC16:
1382     case elfcpp::R_PPC64_TOC16_LO:
1383     case elfcpp::R_PPC64_TOC16_HI:
1384     case elfcpp::R_PPC64_TOC16_HA:
1385     case elfcpp::R_PPC64_TOC16_DS:
1386     case elfcpp::R_PPC64_TOC16_LO_DS:
1387       {
1388         // The symbol requires a GOT entry.
1389         Output_data_got<size, big_endian>* got;
1390
1391         got = target->got_section(symtab, layout);
1392         if (gsym->final_value_is_known())
1393           got->add_global(gsym, GOT_TYPE_STANDARD);
1394         else
1395           {
1396             // If this symbol is not fully resolved, we need to add a
1397             // dynamic relocation for it.
1398             Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1399             if (gsym->is_from_dynobj()
1400                 || gsym->is_undefined()
1401                 || gsym->is_preemptible())
1402               got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn,
1403                                         elfcpp::R_POWERPC_GLOB_DAT);
1404             else if (!gsym->has_got_offset(GOT_TYPE_STANDARD))
1405               {
1406                 unsigned int off = got->add_constant(0);
1407
1408                 gsym->set_got_offset(GOT_TYPE_STANDARD, off);
1409                 rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
1410                                               got, off, 0);
1411               }
1412           }
1413       }
1414       break;
1415
1416     case elfcpp::R_PPC64_TOC:
1417       // We need a GOT section.
1418       target->got_section(symtab, layout);
1419       break;
1420
1421     case elfcpp::R_POWERPC_GOT_TPREL16:
1422     case elfcpp::R_POWERPC_TLS:
1423       // XXX TLS
1424       break;
1425
1426       // These are relocations which should only be seen by the
1427       // dynamic linker, and should never be seen here.
1428     case elfcpp::R_POWERPC_COPY:
1429     case elfcpp::R_POWERPC_GLOB_DAT:
1430     case elfcpp::R_POWERPC_JMP_SLOT:
1431     case elfcpp::R_POWERPC_RELATIVE:
1432     case elfcpp::R_POWERPC_DTPMOD:
1433       gold_error(_("%s: unexpected reloc %u in object file"),
1434                  object->name().c_str(), r_type);
1435       break;
1436
1437     default:
1438       unsupported_reloc_global(object, r_type, gsym);
1439       break;
1440     }
1441 }
1442
1443 // Process relocations for gc.
1444
1445 template<int size, bool big_endian>
1446 void
1447 Target_powerpc<size, big_endian>::gc_process_relocs(
1448                         Symbol_table* symtab,
1449                         Layout* layout,
1450                         Sized_relobj<size, big_endian>* object,
1451                         unsigned int data_shndx,
1452                         unsigned int,
1453                         const unsigned char* prelocs,
1454                         size_t reloc_count,
1455                         Output_section* output_section,
1456                         bool needs_special_offset_handling,
1457                         size_t local_symbol_count,
1458                         const unsigned char* plocal_symbols)
1459 {
1460   typedef Target_powerpc<size, big_endian> Powerpc;
1461   typedef typename Target_powerpc<size, big_endian>::Scan Scan;
1462
1463   gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
1464     symtab,
1465     layout,
1466     this,
1467     object,
1468     data_shndx,
1469     prelocs,
1470     reloc_count,
1471     output_section,
1472     needs_special_offset_handling,
1473     local_symbol_count,
1474     plocal_symbols);
1475 }
1476
1477 // Scan relocations for a section.
1478
1479 template<int size, bool big_endian>
1480 void
1481 Target_powerpc<size, big_endian>::scan_relocs(
1482                         Symbol_table* symtab,
1483                         Layout* layout,
1484                         Sized_relobj<size, big_endian>* object,
1485                         unsigned int data_shndx,
1486                         unsigned int sh_type,
1487                         const unsigned char* prelocs,
1488                         size_t reloc_count,
1489                         Output_section* output_section,
1490                         bool needs_special_offset_handling,
1491                         size_t local_symbol_count,
1492                         const unsigned char* plocal_symbols)
1493 {
1494   typedef Target_powerpc<size, big_endian> Powerpc;
1495   typedef typename Target_powerpc<size, big_endian>::Scan Scan;
1496   static Output_data_space* sdata;
1497
1498   if (sh_type == elfcpp::SHT_REL)
1499     {
1500       gold_error(_("%s: unsupported REL reloc section"),
1501                  object->name().c_str());
1502       return;
1503     }
1504
1505   // Define _SDA_BASE_ at the start of the .sdata section.
1506   if (sdata == NULL)
1507   {
1508     // layout->find_output_section(".sdata") == NULL
1509     sdata = new Output_data_space(4, "** sdata");
1510     Output_section* os = layout->add_output_section_data(".sdata", 0,
1511                                                          elfcpp::SHF_ALLOC
1512                                                          | elfcpp::SHF_WRITE,
1513                                                          sdata, false);
1514     symtab->define_in_output_data("_SDA_BASE_", NULL,
1515                                   os,
1516                                   32768, 0,
1517                                   elfcpp::STT_OBJECT,
1518                                   elfcpp::STB_LOCAL,
1519                                   elfcpp::STV_HIDDEN, 0,
1520                                   false, false);
1521   }
1522
1523   gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
1524     symtab,
1525     layout,
1526     this,
1527     object,
1528     data_shndx,
1529     prelocs,
1530     reloc_count,
1531     output_section,
1532     needs_special_offset_handling,
1533     local_symbol_count,
1534     plocal_symbols);
1535 }
1536
1537 // Finalize the sections.
1538
1539 template<int size, bool big_endian>
1540 void
1541 Target_powerpc<size, big_endian>::do_finalize_sections(
1542     Layout* layout,
1543     const Input_objects*,
1544     Symbol_table*)
1545 {
1546   // Fill in some more dynamic tags.
1547   Output_data_dynamic* const odyn = layout->dynamic_data();
1548   if (odyn != NULL)
1549     {
1550       if (this->plt_ != NULL
1551           && this->plt_->output_section() != NULL)
1552         {
1553           const Output_data* od = this->plt_->rel_plt();
1554           odyn->add_section_size(elfcpp::DT_PLTRELSZ, od);
1555           odyn->add_section_address(elfcpp::DT_JMPREL, od);
1556           odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA);
1557
1558           odyn->add_section_address(elfcpp::DT_PLTGOT, this->plt_);
1559         }
1560
1561       if (this->rela_dyn_ != NULL
1562           && this->rela_dyn_->output_section() != NULL)
1563         {
1564           const Output_data* od = this->rela_dyn_;
1565           odyn->add_section_address(elfcpp::DT_RELA, od);
1566           odyn->add_section_size(elfcpp::DT_RELASZ, od);
1567           odyn->add_constant(elfcpp::DT_RELAENT,
1568                              elfcpp::Elf_sizes<size>::rela_size);
1569         }
1570
1571       if (!parameters->options().shared())
1572         {
1573           // The value of the DT_DEBUG tag is filled in by the dynamic
1574           // linker at run time, and used by the debugger.
1575           odyn->add_constant(elfcpp::DT_DEBUG, 0);
1576         }
1577     }
1578
1579   // Emit any relocs we saved in an attempt to avoid generating COPY
1580   // relocs.
1581   if (this->copy_relocs_.any_saved_relocs())
1582     this->copy_relocs_.emit(this->rela_dyn_section(layout));
1583 }
1584
1585 // Perform a relocation.
1586
1587 template<int size, bool big_endian>
1588 inline bool
1589 Target_powerpc<size, big_endian>::Relocate::relocate(
1590                         const Relocate_info<size, big_endian>* relinfo,
1591                         Target_powerpc* target,
1592                         Output_section*,
1593                         size_t relnum,
1594                         const elfcpp::Rela<size, big_endian>& rela,
1595                         unsigned int r_type,
1596                         const Sized_symbol<size>* gsym,
1597                         const Symbol_value<size>* psymval,
1598                         unsigned char* view,
1599                         typename elfcpp::Elf_types<size>::Elf_Addr address,
1600                         section_size_type /* view_size */)
1601 {
1602   const unsigned int toc_base_offset = 0x8000;
1603   typedef Powerpc_relocate_functions<size, big_endian> Reloc;
1604
1605   // Pick the value to use for symbols defined in shared objects.
1606   Symbol_value<size> symval;
1607   if (gsym != NULL
1608       && gsym->use_plt_offset(r_type == elfcpp::R_POWERPC_REL24
1609                               || r_type == elfcpp::R_PPC_LOCAL24PC
1610                               || r_type == elfcpp::R_PPC_REL16
1611                               || r_type == elfcpp::R_PPC_REL16_LO
1612                               || r_type == elfcpp::R_PPC_REL16_HI
1613                               || r_type == elfcpp::R_PPC_REL16_HA))
1614     {
1615       elfcpp::Elf_Xword value;
1616
1617       value = target->plt_section()->address() + gsym->plt_offset();
1618
1619       symval.set_output_value(value);
1620
1621       psymval = &symval;
1622     }
1623
1624   const Sized_relobj<size, big_endian>* object = relinfo->object;
1625   elfcpp::Elf_Xword addend = rela.get_r_addend();
1626
1627   // Get the GOT offset if needed.  Unlike i386 and x86_64, our GOT
1628   // pointer points to the beginning, not the end, of the table.
1629   // So we just use the plain offset.
1630   bool have_got_offset = false;
1631   unsigned int got_offset = 0;
1632   unsigned int got2_offset = 0;
1633   switch (r_type)
1634     {
1635     case elfcpp::R_PPC64_TOC16:
1636     case elfcpp::R_PPC64_TOC16_LO:
1637     case elfcpp::R_PPC64_TOC16_HI:
1638     case elfcpp::R_PPC64_TOC16_HA:
1639     case elfcpp::R_PPC64_TOC16_DS:
1640     case elfcpp::R_PPC64_TOC16_LO_DS:
1641         // Subtract the TOC base address.
1642         addend -= target->toc_section()->address() + toc_base_offset;
1643         /* FALLTHRU */
1644
1645     case elfcpp::R_POWERPC_GOT16:
1646     case elfcpp::R_POWERPC_GOT16_LO:
1647     case elfcpp::R_POWERPC_GOT16_HI:
1648     case elfcpp::R_POWERPC_GOT16_HA:
1649     case elfcpp::R_PPC64_GOT16_DS:
1650     case elfcpp::R_PPC64_GOT16_LO_DS:
1651       if (gsym != NULL)
1652         {
1653           gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
1654           got_offset = gsym->got_offset(GOT_TYPE_STANDARD);
1655         }
1656       else
1657         {
1658           unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
1659           gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
1660           got_offset = object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
1661         }
1662       have_got_offset = true;
1663       break;
1664
1665       // R_PPC_PLTREL24 is rather special.  If non-zero,
1666       // the addend specifies the GOT pointer offset within .got2.
1667     case elfcpp::R_PPC_PLTREL24:
1668       if (addend >= 32768)
1669         {
1670           Output_data_space* got2;
1671           got2 = target->got2_section();
1672           got2_offset = got2->offset();
1673           addend += got2_offset;
1674         }
1675       have_got_offset = true;
1676       break;
1677
1678     default:
1679       break;
1680     }
1681
1682   switch (r_type)
1683     {
1684     case elfcpp::R_POWERPC_NONE:
1685     case elfcpp::R_POWERPC_GNU_VTINHERIT:
1686     case elfcpp::R_POWERPC_GNU_VTENTRY:
1687       break;
1688
1689     case elfcpp::R_POWERPC_REL32:
1690       Reloc::rel32(view, object, psymval, addend, address);
1691       break;
1692
1693     case elfcpp::R_POWERPC_REL24:
1694       Reloc::rel24(view, object, psymval, addend, address);
1695       break;
1696
1697     case elfcpp::R_POWERPC_REL14:
1698       Reloc::rel14(view, object, psymval, addend, address);
1699       break;
1700
1701     case elfcpp::R_PPC_PLTREL24:
1702       Reloc::rel24(view, object, psymval, addend, address);
1703       break;
1704
1705     case elfcpp::R_PPC_LOCAL24PC:
1706       Reloc::rel24(view, object, psymval, addend, address);
1707       break;
1708
1709     case elfcpp::R_PPC64_ADDR64:
1710       if (!parameters->options().output_is_position_independent())
1711         Relocate_functions<size, big_endian>::rela64(view, object,
1712                                                      psymval, addend);
1713       break;
1714
1715     case elfcpp::R_POWERPC_ADDR32:
1716       if (!parameters->options().output_is_position_independent())
1717         Relocate_functions<size, big_endian>::rela32(view, object,
1718                                                      psymval, addend);
1719       break;
1720
1721     case elfcpp::R_POWERPC_ADDR16_LO:
1722       Reloc::addr16_lo(view, object, psymval, addend);
1723       break;
1724
1725     case elfcpp::R_POWERPC_ADDR16_HI:
1726       Reloc::addr16_hi(view, object, psymval, addend);
1727       break;
1728
1729     case elfcpp::R_POWERPC_ADDR16_HA:
1730       Reloc::addr16_ha(view, object, psymval, addend);
1731       break;
1732
1733     case elfcpp::R_PPC_REL16_LO:
1734       Reloc::rel16_lo(view, object, psymval, addend, address);
1735       break;
1736
1737     case elfcpp::R_PPC_REL16_HI:
1738       Reloc::rel16_lo(view, object, psymval, addend, address);
1739       break;
1740
1741     case elfcpp::R_PPC_REL16_HA:
1742       Reloc::rel16_ha(view, object, psymval, addend, address);
1743       break;
1744
1745     case elfcpp::R_POWERPC_GOT16:
1746       Reloc::addr16(view, got_offset, addend);
1747       break;
1748
1749     case elfcpp::R_POWERPC_GOT16_LO:
1750       Reloc::addr16_lo(view, got_offset, addend);
1751       break;
1752
1753     case elfcpp::R_POWERPC_GOT16_HI:
1754       Reloc::addr16_hi(view, got_offset, addend);
1755       break;
1756
1757     case elfcpp::R_POWERPC_GOT16_HA:
1758       Reloc::addr16_ha(view, got_offset, addend);
1759       break;
1760
1761     case elfcpp::R_PPC64_TOC16:
1762       Reloc::addr16(view, got_offset, addend);
1763       break;
1764
1765     case elfcpp::R_PPC64_TOC16_LO:
1766       Reloc::addr16_lo(view, got_offset, addend);
1767       break;
1768
1769     case elfcpp::R_PPC64_TOC16_HI:
1770       Reloc::addr16_hi(view, got_offset, addend);
1771       break;
1772
1773     case elfcpp::R_PPC64_TOC16_HA:
1774       Reloc::addr16_ha(view, got_offset, addend);
1775       break;
1776
1777     case elfcpp::R_PPC64_TOC16_DS:
1778     case elfcpp::R_PPC64_TOC16_LO_DS:
1779       Reloc::addr16_ds(view, got_offset, addend);
1780       break;
1781
1782     case elfcpp::R_PPC64_TOC:
1783       {
1784         elfcpp::Elf_types<64>::Elf_Addr value;
1785         value = target->toc_section()->address() + toc_base_offset;
1786         Relocate_functions<64, false>::rela64(view, value, addend);
1787       }
1788       break;
1789
1790     case elfcpp::R_POWERPC_COPY:
1791     case elfcpp::R_POWERPC_GLOB_DAT:
1792     case elfcpp::R_POWERPC_JMP_SLOT:
1793     case elfcpp::R_POWERPC_RELATIVE:
1794       // This is an outstanding tls reloc, which is unexpected when
1795       // linking.
1796     case elfcpp::R_POWERPC_DTPMOD:
1797       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1798                              _("unexpected reloc %u in object file"),
1799                              r_type);
1800       break;
1801
1802     default:
1803       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1804                              _("unsupported reloc %u"),
1805                              r_type);
1806       break;
1807     }
1808
1809   return true;
1810 }
1811
1812 // Perform a TLS relocation.
1813
1814 template<int size, bool big_endian>
1815 inline void
1816 Target_powerpc<size, big_endian>::Relocate::relocate_tls(
1817                         const Relocate_info<size, big_endian>* relinfo,
1818                         Target_powerpc<size, big_endian>* target,
1819                         size_t relnum,
1820                         const elfcpp::Rela<size, big_endian>& rela,
1821                         unsigned int r_type,
1822                         const Sized_symbol<size>* gsym,
1823                         const Symbol_value<size>* psymval,
1824                         unsigned char* view,
1825                         typename elfcpp::Elf_types<size>::Elf_Addr address,
1826                         section_size_type)
1827 {
1828   Output_segment* tls_segment = relinfo->layout->tls_segment();
1829   typedef Powerpc_relocate_functions<size, big_endian> Reloc;
1830   const Sized_relobj<size, big_endian>* object = relinfo->object;
1831
1832   const elfcpp::Elf_Xword addend = rela.get_r_addend();
1833   typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(object, 0);
1834
1835   const bool is_final =
1836     (gsym == NULL
1837      ? !parameters->options().output_is_position_independent()
1838      : gsym->final_value_is_known());
1839   const tls::Tls_optimization optimized_type
1840       = optimize_tls_reloc(is_final, r_type);
1841
1842   switch (r_type)
1843     {
1844       // XXX
1845     }
1846 }
1847
1848 // Relocate section data.
1849
1850 template<int size, bool big_endian>
1851 void
1852 Target_powerpc<size, big_endian>::relocate_section(
1853                         const Relocate_info<size, big_endian>* relinfo,
1854                         unsigned int sh_type,
1855                         const unsigned char* prelocs,
1856                         size_t reloc_count,
1857                         Output_section* output_section,
1858                         bool needs_special_offset_handling,
1859                         unsigned char* view,
1860                         typename elfcpp::Elf_types<size>::Elf_Addr address,
1861                         section_size_type view_size,
1862                         const Reloc_symbol_changes* reloc_symbol_changes)
1863 {
1864   typedef Target_powerpc<size, big_endian> Powerpc;
1865   typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate;
1866
1867   gold_assert(sh_type == elfcpp::SHT_RELA);
1868
1869   gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA,
1870     Powerpc_relocate>(
1871     relinfo,
1872     this,
1873     prelocs,
1874     reloc_count,
1875     output_section,
1876     needs_special_offset_handling,
1877     view,
1878     address,
1879     view_size,
1880     reloc_symbol_changes);
1881 }
1882
1883 // Return the size of a relocation while scanning during a relocatable
1884 // link.
1885
1886 template<int size, bool big_endian>
1887 unsigned int
1888 Target_powerpc<size, big_endian>::Relocatable_size_for_reloc::get_size_for_reloc(
1889     unsigned int,
1890     Relobj*)
1891 {
1892   // We are always SHT_RELA, so we should never get here.
1893   gold_unreachable();
1894   return 0;
1895 }
1896
1897 // Scan the relocs during a relocatable link.
1898
1899 template<int size, bool big_endian>
1900 void
1901 Target_powerpc<size, big_endian>::scan_relocatable_relocs(
1902                         Symbol_table* symtab,
1903                         Layout* layout,
1904                         Sized_relobj<size, big_endian>* object,
1905                         unsigned int data_shndx,
1906                         unsigned int sh_type,
1907                         const unsigned char* prelocs,
1908                         size_t reloc_count,
1909                         Output_section* output_section,
1910                         bool needs_special_offset_handling,
1911                         size_t local_symbol_count,
1912                         const unsigned char* plocal_symbols,
1913                         Relocatable_relocs* rr)
1914 {
1915   gold_assert(sh_type == elfcpp::SHT_RELA);
1916
1917   typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA,
1918     Relocatable_size_for_reloc> Scan_relocatable_relocs;
1919
1920   gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA,
1921       Scan_relocatable_relocs>(
1922     symtab,
1923     layout,
1924     object,
1925     data_shndx,
1926     prelocs,
1927     reloc_count,
1928     output_section,
1929     needs_special_offset_handling,
1930     local_symbol_count,
1931     plocal_symbols,
1932     rr);
1933 }
1934
1935 // Relocate a section during a relocatable link.
1936
1937 template<int size, bool big_endian>
1938 void
1939 Target_powerpc<size, big_endian>::relocate_for_relocatable(
1940     const Relocate_info<size, big_endian>* relinfo,
1941     unsigned int sh_type,
1942     const unsigned char* prelocs,
1943     size_t reloc_count,
1944     Output_section* output_section,
1945     off_t offset_in_output_section,
1946     const Relocatable_relocs* rr,
1947     unsigned char* view,
1948     typename elfcpp::Elf_types<size>::Elf_Addr view_address,
1949     section_size_type view_size,
1950     unsigned char* reloc_view,
1951     section_size_type reloc_view_size)
1952 {
1953   gold_assert(sh_type == elfcpp::SHT_RELA);
1954
1955   gold::relocate_for_relocatable<size, big_endian, elfcpp::SHT_RELA>(
1956     relinfo,
1957     prelocs,
1958     reloc_count,
1959     output_section,
1960     offset_in_output_section,
1961     rr,
1962     view,
1963     view_address,
1964     view_size,
1965     reloc_view,
1966     reloc_view_size);
1967 }
1968
1969 // Return the value to use for a dynamic which requires special
1970 // treatment.  This is how we support equality comparisons of function
1971 // pointers across shared library boundaries, as described in the
1972 // processor specific ABI supplement.
1973
1974 template<int size, bool big_endian>
1975 uint64_t
1976 Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
1977 {
1978   gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
1979   return this->plt_section()->address() + gsym->plt_offset();
1980 }
1981
1982 // The selector for powerpc object files.
1983
1984 template<int size, bool big_endian>
1985 class Target_selector_powerpc : public Target_selector
1986 {
1987 public:
1988   Target_selector_powerpc()
1989     : Target_selector(elfcpp::EM_NONE, size, big_endian,
1990                       (size == 64 ?
1991                        (big_endian ? "elf64-powerpc" : "elf64-powerpcle") :
1992                        (big_endian ? "elf32-powerpc" : "elf32-powerpcle")))
1993   { }
1994
1995   Target* do_recognize(int machine, int, int)
1996   {
1997     switch (size)
1998       {
1999       case 64:
2000         if (machine != elfcpp::EM_PPC64)
2001           return NULL;
2002         break;
2003
2004       case 32:
2005         if (machine != elfcpp::EM_PPC)
2006           return NULL;
2007         break;
2008
2009       default:
2010         return NULL;
2011       }
2012
2013     return this->instantiate_target();
2014   }
2015
2016   Target* do_instantiate_target()
2017   { return new Target_powerpc<size, big_endian>(); }
2018 };
2019
2020 Target_selector_powerpc<32, true> target_selector_ppc32;
2021 Target_selector_powerpc<32, false> target_selector_ppc32le;
2022 Target_selector_powerpc<64, true> target_selector_ppc64;
2023 Target_selector_powerpc<64, false> target_selector_ppc64le;
2024
2025 } // End anonymous namespace.