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                                     Symbol_table::PREDEFINED,
 742                                     this->got_,
 743                                     0, 0, elfcpp::STT_OBJECT,
 744                                     elfcpp::STB_LOCAL,
 745                                     elfcpp::STV_HIDDEN, 0,
 746                                     false, false);
 747     }
 748
 749   return this->got_;
 750 }
 751
 752 // Get the dynamic reloc section, creating it if necessary.
 753
 754 template<int size, bool big_endian>
 755 typename Target_powerpc<size, big_endian>::Reloc_section*
 756 Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout)
 757 {
 758   if (this->rela_dyn_ == NULL)
 759     {
 760       gold_assert(layout != NULL);
 761       this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
 762       layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
 763                                       elfcpp::SHF_ALLOC, this->rela_dyn_, true);
 764     }
 765   return this->rela_dyn_;
 766 }
 767
 768 // A class to handle the PLT data.
 769
 770 template<int size, bool big_endian>
 771 class Output_data_plt_powerpc : public Output_section_data
 772 {
 773  public:
 774   typedef Output_data_reloc<elfcpp::SHT_RELA, true,
 775                             size, big_endian> Reloc_section;
 776
 777   Output_data_plt_powerpc(Layout*);
 778
 779   // Add an entry to the PLT.
 780   void add_entry(Symbol* gsym);
 781
 782   // Return the .rela.plt section data.
 783   const Reloc_section* rel_plt() const
 784  {
 785     return this->rel_;
 786   }
 787
 788  protected:
 789   void do_adjust_output_section(Output_section* os);
 790
 791  private:
 792   // The size of an entry in the PLT.
 793   static const int base_plt_entry_size = (size == 32 ? 16 : 24);
 794
 795   // Set the final size.
 796   void
 797   set_final_data_size()
 798   {
 799     unsigned int full_count = this->count_ + 4;
 800
 801     this->set_data_size(full_count * base_plt_entry_size);
 802   }
 803
 804   // Write out the PLT data.
 805   void
 806   do_write(Output_file*);
 807
 808   // The reloc section.
 809   Reloc_section* rel_;
 810   // The number of PLT entries.
 811   unsigned int count_;
 812 };
 813
 814 // Create the PLT section.  The ordinary .got section is an argument,
 815 // since we need to refer to the start.
 816
 817 template<int size, bool big_endian>
 818 Output_data_plt_powerpc<size, big_endian>::Output_data_plt_powerpc(Layout* layout)
 819   : Output_section_data(size == 32 ? 4 : 8), count_(0)
 820 {
 821   this->rel_ = new Reloc_section(false);
 822   layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
 823                                   elfcpp::SHF_ALLOC, this->rel_, true);
 824 }
 825
 826 template<int size, bool big_endian>
 827 void
 828 Output_data_plt_powerpc<size, big_endian>::do_adjust_output_section(Output_section* os)
 829 {
 830   os->set_entsize(0);
 831 }
 832
 833 // Add an entry to the PLT.
 834
 835 template<int size, bool big_endian>
 836 void
 837 Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym)
 838 {
 839   gold_assert(!gsym->has_plt_offset());
 840   unsigned int index = this->count_+ + 4;
 841   section_offset_type plt_offset;
 842
 843   if (index < 8192)
 844     plt_offset = index * base_plt_entry_size;
 845   else
 846     gold_unreachable();
 847
 848   gsym->set_plt_offset(plt_offset);
 849
 850   ++this->count_;
 851
 852   gsym->set_needs_dynsym_entry();
 853   this->rel_->add_global(gsym, elfcpp::R_POWERPC_JMP_SLOT, this,
 854                          plt_offset, 0);
 855 }
 856
 857 static const unsigned int addis_11_11     = 0x3d6b0000;
 858 static const unsigned int addis_11_30     = 0x3d7e0000;
 859 static const unsigned int addis_12_12     = 0x3d8c0000;
 860 static const unsigned int addi_11_11      = 0x396b0000;
 861 static const unsigned int add_0_11_11     = 0x7c0b5a14;
 862 static const unsigned int add_11_0_11     = 0x7d605a14;
 863 static const unsigned int b               = 0x48000000;
 864 static const unsigned int bcl_20_31       = 0x429f0005;
 865 static const unsigned int bctr            = 0x4e800420;
 866 static const unsigned int lis_11          = 0x3d600000;
 867 static const unsigned int lis_12          = 0x3d800000;
 868 static const unsigned int lwzu_0_12       = 0x840c0000;
 869 static const unsigned int lwz_0_12        = 0x800c0000;
 870 static const unsigned int lwz_11_11       = 0x816b0000;
 871 static const unsigned int lwz_11_30       = 0x817e0000;
 872 static const unsigned int lwz_12_12       = 0x818c0000;
 873 static const unsigned int mflr_0          = 0x7c0802a6;
 874 static const unsigned int mflr_12         = 0x7d8802a6;
 875 static const unsigned int mtctr_0         = 0x7c0903a6;
 876 static const unsigned int mtctr_11        = 0x7d6903a6;
 877 static const unsigned int mtlr_0          = 0x7c0803a6;
 878 static const unsigned int nop             = 0x60000000;
 879 static const unsigned int sub_11_11_12    = 0x7d6c5850;
 880
 881 static const unsigned int addis_r12_r2    = 0x3d820000;  /* addis %r12,%r2,xxx@ha     */
 882 static const unsigned int std_r2_40r1     = 0xf8410028;  /* std   %r2,40(%r1)         */
 883 static const unsigned int ld_r11_0r12     = 0xe96c0000;  /* ld    %r11,xxx+0@l(%r12)  */
 884 static const unsigned int ld_r2_0r12      = 0xe84c0000;  /* ld    %r2,xxx+8@l(%r12)   */
 885                                                          /* ld    %r11,xxx+16@l(%r12) */
 886
 887
 888 // Write out the PLT.
 889
 890 template<int size, bool big_endian>
 891 void
 892 Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of)
 893 {
 894   const off_t offset = this->offset();
 895   const section_size_type oview_size =
 896     convert_to_section_size_type(this->data_size());
 897   unsigned char* const oview = of->get_output_view(offset, oview_size);
 898   unsigned char* pov = oview;
 899
 900   memset(pov, 0, base_plt_entry_size * 4);
 901   pov += base_plt_entry_size * 4;
 902
 903   unsigned int plt_offset = base_plt_entry_size * 4;
 904   const unsigned int count = this->count_;
 905
 906   if (size == 64)
 907     {
 908       for (unsigned int i = 0; i < count; i++)
 909         {
 910         }
 911     }
 912   else
 913     {
 914       for (unsigned int i = 0; i < count; i++)
 915         {
 916           elfcpp::Swap<32, true>::writeval(pov + 0x00,
 917                                            lwz_11_30 + plt_offset);
 918           elfcpp::Swap<32, true>::writeval(pov + 0x04, mtctr_11);
 919           elfcpp::Swap<32, true>::writeval(pov + 0x08, bctr);
 920           elfcpp::Swap<32, true>::writeval(pov + 0x0c, nop);
 921           pov += base_plt_entry_size;
 922           plt_offset += base_plt_entry_size;
 923         }
 924     }
 925
 926   gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
 927
 928   of->write_output_view(offset, oview_size, oview);
 929 }
 930
 931 // Create a PLT entry for a global symbol.
 932
 933 template<int size, bool big_endian>
 934 void
 935 Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab,
 936                                                  Layout* layout,
 937                                                  Symbol* gsym)
 938 {
 939   if (gsym->has_plt_offset())
 940     return;
 941
 942   if (this->plt_ == NULL)
 943     {
 944       // Create the GOT section first.
 945       this->got_section(symtab, layout);
 946
 947       this->plt_ = new Output_data_plt_powerpc<size, big_endian>(layout);
 948       layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
 949                                       (elfcpp::SHF_ALLOC
 950                                        | elfcpp::SHF_EXECINSTR
 951                                        | elfcpp::SHF_WRITE),
 952                                       this->plt_, false);
 953
 954       // Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section.
 955       symtab->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL,
 956                                     Symbol_table::PREDEFINED,
 957                                     this->plt_,
 958                                     0, 0, elfcpp::STT_OBJECT,
 959                                     elfcpp::STB_LOCAL,
 960                                     elfcpp::STV_HIDDEN, 0,
 961                                     false, false);
 962     }
 963
 964   this->plt_->add_entry(gsym);
 965 }
 966
 967 // Create a GOT entry for the TLS module index.
 968
 969 template<int size, bool big_endian>
 970 unsigned int
 971 Target_powerpc<size, big_endian>::got_mod_index_entry(Symbol_table* symtab,
 972                                                       Layout* layout,
 973                                                       Sized_relobj<size, big_endian>* object)
 974 {
 975   if (this->got_mod_index_offset_ == -1U)
 976     {
 977       gold_assert(symtab != NULL && layout != NULL && object != NULL);
 978       Reloc_section* rela_dyn = this->rela_dyn_section(layout);
 979       Output_data_got<size, big_endian>* got;
 980       unsigned int got_offset;
 981
 982       got = this->got_section(symtab, layout);
 983       got_offset = got->add_constant(0);
 984       rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got,
 985                           got_offset, 0);
 986       got->add_constant(0);
 987       this->got_mod_index_offset_ = got_offset;
 988     }
 989   return this->got_mod_index_offset_;
 990 }
 991
 992 // Optimize the TLS relocation type based on what we know about the
 993 // symbol.  IS_FINAL is true if the final address of this symbol is
 994 // known at link time.
 995
 996 static tls::Tls_optimization
 997 optimize_tls_reloc(bool /* is_final */, int r_type)
 998 {
 999   // If we are generating a shared library, then we can't do anything
1000   // in the linker.
1001   if (parameters->options().shared())
1002     return tls::TLSOPT_NONE;
1003   switch (r_type)
1004     {
1005       // XXX
1006     default:
1007       gold_unreachable();
1008     }
1009 }
1010
1011 // Report an unsupported relocation against a local symbol.
1012
1013 template<int size, bool big_endian>
1014 void
1015 Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local(
1016                         Sized_relobj<size, big_endian>* object,
1017                         unsigned int r_type)
1018 {
1019   gold_error(_("%s: unsupported reloc %u against local symbol"),
1020              object->name().c_str(), r_type);
1021 }
1022
1023 // We are about to emit a dynamic relocation of type R_TYPE.  If the
1024 // dynamic linker does not support it, issue an error.
1025
1026 template<int size, bool big_endian>
1027 void
1028 Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object,
1029                                                       unsigned int r_type)
1030 {
1031   gold_assert(r_type != elfcpp::R_POWERPC_NONE);
1032
1033   // These are the relocation types supported by glibc for both 32-bit
1034   // and 64-bit powerpc.
1035   switch (r_type)
1036     {
1037     case elfcpp::R_POWERPC_RELATIVE:
1038     case elfcpp::R_POWERPC_GLOB_DAT:
1039     case elfcpp::R_POWERPC_DTPMOD:
1040     case elfcpp::R_POWERPC_DTPREL:
1041     case elfcpp::R_POWERPC_TPREL:
1042     case elfcpp::R_POWERPC_JMP_SLOT:
1043     case elfcpp::R_POWERPC_COPY:
1044     case elfcpp::R_POWERPC_ADDR32:
1045     case elfcpp::R_POWERPC_ADDR24:
1046     case elfcpp::R_POWERPC_REL24:
1047       return;
1048
1049     default:
1050       break;
1051     }
1052
1053   if (size == 64)
1054     {
1055       switch (r_type)
1056         {
1057           // These are the relocation types supported only on 64-bit.
1058         case elfcpp::R_PPC64_ADDR64:
1059         case elfcpp::R_PPC64_TPREL16_LO_DS:
1060         case elfcpp::R_PPC64_TPREL16_DS:
1061         case elfcpp::R_POWERPC_TPREL16:
1062         case elfcpp::R_POWERPC_TPREL16_LO:
1063         case elfcpp::R_POWERPC_TPREL16_HI:
1064         case elfcpp::R_POWERPC_TPREL16_HA:
1065         case elfcpp::R_PPC64_TPREL16_HIGHER:
1066         case elfcpp::R_PPC64_TPREL16_HIGHEST:
1067         case elfcpp::R_PPC64_TPREL16_HIGHERA:
1068         case elfcpp::R_PPC64_TPREL16_HIGHESTA:
1069         case elfcpp::R_PPC64_ADDR16_LO_DS:
1070         case elfcpp::R_POWERPC_ADDR16_LO:
1071         case elfcpp::R_POWERPC_ADDR16_HI:
1072         case elfcpp::R_POWERPC_ADDR16_HA:
1073         case elfcpp::R_POWERPC_ADDR30:
1074         case elfcpp::R_PPC64_UADDR64:
1075         case elfcpp::R_POWERPC_UADDR32:
1076         case elfcpp::R_POWERPC_ADDR16:
1077         case elfcpp::R_POWERPC_UADDR16:
1078         case elfcpp::R_PPC64_ADDR16_DS:
1079         case elfcpp::R_PPC64_ADDR16_HIGHER:
1080         case elfcpp::R_PPC64_ADDR16_HIGHEST:
1081         case elfcpp::R_PPC64_ADDR16_HIGHERA:
1082         case elfcpp::R_PPC64_ADDR16_HIGHESTA:
1083         case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
1084         case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
1085         case elfcpp::R_POWERPC_REL32:
1086         case elfcpp::R_PPC64_REL64:
1087           return;
1088
1089         default:
1090           break;
1091         }
1092     }
1093   else
1094     {
1095       switch (r_type)
1096         {
1097           // These are the relocation types supported only on 32-bit.
1098
1099         default:
1100           break;
1101         }
1102     }
1103
1104   // This prevents us from issuing more than one error per reloc
1105   // section.  But we can still wind up issuing more than one
1106   // error per object file.
1107   if (this->issued_non_pic_error_)
1108     return;
1109   gold_assert(parameters->options().output_is_position_independent());
1110   object->error(_("requires unsupported dynamic reloc; "
1111                   "recompile with -fPIC"));
1112   this->issued_non_pic_error_ = true;
1113   return;
1114 }
1115
1116 // Scan a relocation for a local symbol.
1117
1118 template<int size, bool big_endian>
1119 inline void
1120 Target_powerpc<size, big_endian>::Scan::local(
1121                         Symbol_table* symtab,
1122                         Layout* layout,
1123                         Target_powerpc<size, big_endian>* target,
1124                         Sized_relobj<size, big_endian>* object,
1125                         unsigned int data_shndx,
1126                         Output_section* output_section,
1127                         const elfcpp::Rela<size, big_endian>& reloc,
1128                         unsigned int r_type,
1129                         const elfcpp::Sym<size, big_endian>& lsym)
1130 {
1131   switch (r_type)
1132     {
1133     case elfcpp::R_POWERPC_NONE:
1134     case elfcpp::R_POWERPC_GNU_VTINHERIT:
1135     case elfcpp::R_POWERPC_GNU_VTENTRY:
1136       break;
1137
1138     case elfcpp::R_PPC64_ADDR64:
1139     case elfcpp::R_POWERPC_ADDR32:
1140     case elfcpp::R_POWERPC_ADDR16_HA:
1141     case elfcpp::R_POWERPC_ADDR16_LO:
1142       // If building a shared library (or a position-independent
1143       // executable), we need to create a dynamic relocation for
1144       // this location.
1145       if (parameters->options().output_is_position_independent())
1146         {
1147           Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1148
1149           check_non_pic(object, r_type);
1150           if (lsym.get_st_type() != elfcpp::STT_SECTION)
1151             {
1152               unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1153               rela_dyn->add_local(object, r_sym, r_type, output_section,
1154                                   data_shndx, reloc.get_r_offset(),
1155                                   reloc.get_r_addend());
1156             }
1157           else
1158             {
1159               unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1160               gold_assert(lsym.get_st_value() == 0);
1161               rela_dyn->add_local_relative(object, r_sym, r_type,
1162                                            output_section, data_shndx,
1163                                            reloc.get_r_offset(),
1164                                            reloc.get_r_addend());
1165             }
1166         }
1167       break;
1168
1169     case elfcpp::R_POWERPC_REL24:
1170     case elfcpp::R_PPC_LOCAL24PC:
1171     case elfcpp::R_POWERPC_REL32:
1172     case elfcpp::R_PPC_REL16_LO:
1173     case elfcpp::R_PPC_REL16_HA:
1174       break;
1175
1176     case elfcpp::R_POWERPC_GOT16:
1177     case elfcpp::R_POWERPC_GOT16_LO:
1178     case elfcpp::R_POWERPC_GOT16_HI:
1179     case elfcpp::R_POWERPC_GOT16_HA:
1180     case elfcpp::R_PPC64_TOC16:
1181     case elfcpp::R_PPC64_TOC16_LO:
1182     case elfcpp::R_PPC64_TOC16_HI:
1183     case elfcpp::R_PPC64_TOC16_HA:
1184     case elfcpp::R_PPC64_TOC16_DS:
1185     case elfcpp::R_PPC64_TOC16_LO_DS:
1186       {
1187         // The symbol requires a GOT entry.
1188         Output_data_got<size, big_endian>* got;
1189         unsigned int r_sym;
1190
1191         got = target->got_section(symtab, layout);
1192         r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1193
1194         // If we are generating a shared object, we need to add a
1195         // dynamic relocation for this symbol's GOT entry.
1196         if (parameters->options().output_is_position_independent())
1197           {
1198             if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD))
1199               {
1200                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1201                 unsigned int off;
1202
1203                 off = got->add_constant(0);
1204                 object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off);
1205                 rela_dyn->add_local_relative(object, r_sym,
1206                                              elfcpp::R_POWERPC_RELATIVE,
1207                                              got, off, 0);
1208               }
1209           }
1210         else
1211           got->add_local(object, r_sym, GOT_TYPE_STANDARD);
1212       }
1213       break;
1214
1215     case elfcpp::R_PPC64_TOC:
1216       // We need a GOT section.
1217       target->got_section(symtab, layout);
1218       break;
1219
1220       // These are relocations which should only be seen by the
1221       // dynamic linker, and should never be seen here.
1222     case elfcpp::R_POWERPC_COPY:
1223     case elfcpp::R_POWERPC_GLOB_DAT:
1224     case elfcpp::R_POWERPC_JMP_SLOT:
1225     case elfcpp::R_POWERPC_RELATIVE:
1226     case elfcpp::R_POWERPC_DTPMOD:
1227       gold_error(_("%s: unexpected reloc %u in object file"),
1228                  object->name().c_str(), r_type);
1229       break;
1230
1231     default:
1232       unsupported_reloc_local(object, r_type);
1233       break;
1234     }
1235 }
1236
1237 // Report an unsupported relocation against a global symbol.
1238
1239 template<int size, bool big_endian>
1240 void
1241 Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global(
1242                         Sized_relobj<size, big_endian>* object,
1243                         unsigned int r_type,
1244                         Symbol* gsym)
1245 {
1246   gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1247              object->name().c_str(), r_type, gsym->demangled_name().c_str());
1248 }
1249
1250 // Scan a relocation for a global symbol.
1251
1252 template<int size, bool big_endian>
1253 inline void
1254 Target_powerpc<size, big_endian>::Scan::global(
1255                                 Symbol_table* symtab,
1256                                 Layout* layout,
1257                                 Target_powerpc<size, big_endian>* target,
1258                                 Sized_relobj<size, big_endian>* object,
1259                                 unsigned int data_shndx,
1260                                 Output_section* output_section,
1261                                 const elfcpp::Rela<size, big_endian>& reloc,
1262                                 unsigned int r_type,
1263                                 Symbol* gsym)
1264 {
1265   switch (r_type)
1266     {
1267     case elfcpp::R_POWERPC_NONE:
1268     case elfcpp::R_POWERPC_GNU_VTINHERIT:
1269     case elfcpp::R_POWERPC_GNU_VTENTRY:
1270       break;
1271
1272     case elfcpp::R_PPC_PLTREL24:
1273       // If the symbol is fully resolved, this is just a PC32 reloc.
1274       // Otherwise we need a PLT entry.
1275       if (gsym->final_value_is_known())
1276         break;
1277       // If building a shared library, we can also skip the PLT entry
1278       // if the symbol is defined in the output file and is protected
1279       // or hidden.
1280       if (gsym->is_defined()
1281           && !gsym->is_from_dynobj()
1282           && !gsym->is_preemptible())
1283         break;
1284       target->make_plt_entry(symtab, layout, gsym);
1285       break;
1286
1287     case elfcpp::R_POWERPC_ADDR16:
1288     case elfcpp::R_POWERPC_ADDR16_LO:
1289     case elfcpp::R_POWERPC_ADDR16_HI:
1290     case elfcpp::R_POWERPC_ADDR16_HA:
1291     case elfcpp::R_POWERPC_ADDR32:
1292     case elfcpp::R_PPC64_ADDR64:
1293       {
1294         // Make a PLT entry if necessary.
1295         if (gsym->needs_plt_entry())
1296           {
1297             target->make_plt_entry(symtab, layout, gsym);
1298             // Since this is not a PC-relative relocation, we may be
1299             // taking the address of a function. In that case we need to
1300             // set the entry in the dynamic symbol table to the address of
1301             // the PLT entry.
1302             if (gsym->is_from_dynobj() && !parameters->options().shared())
1303               gsym->set_needs_dynsym_value();
1304           }
1305         // Make a dynamic relocation if necessary.
1306         if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF))
1307           {
1308             if (gsym->may_need_copy_reloc())
1309               {
1310                 target->copy_reloc(symtab, layout, object,
1311                                    data_shndx, output_section, gsym, reloc);
1312               }
1313             else if ((r_type == elfcpp::R_POWERPC_ADDR32
1314                       || r_type == elfcpp::R_PPC64_ADDR64)
1315                      && gsym->can_use_relative_reloc(false))
1316               {
1317                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1318                 rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
1319                                               output_section, object,
1320                                               data_shndx, reloc.get_r_offset(),
1321                                               reloc.get_r_addend());
1322               }
1323             else
1324               {
1325                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1326
1327                 check_non_pic(object, r_type);
1328                 if (gsym->is_from_dynobj()
1329                     || gsym->is_undefined()
1330                     || gsym->is_preemptible())
1331                   rela_dyn->add_global(gsym, r_type, output_section,
1332                                        object, data_shndx,
1333                                        reloc.get_r_offset(),
1334                                        reloc.get_r_addend());
1335                 else
1336                   rela_dyn->add_global_relative(gsym, r_type,
1337                                                 output_section, object,
1338                                                 data_shndx,
1339                                                 reloc.get_r_offset(),
1340                                                 reloc.get_r_addend());
1341               }
1342           }
1343       }
1344       break;
1345
1346     case elfcpp::R_POWERPC_REL24:
1347     case elfcpp::R_PPC_LOCAL24PC:
1348     case elfcpp::R_PPC_REL16:
1349     case elfcpp::R_PPC_REL16_LO:
1350     case elfcpp::R_PPC_REL16_HI:
1351     case elfcpp::R_PPC_REL16_HA:
1352       {
1353         if (gsym->needs_plt_entry())
1354           target->make_plt_entry(symtab, layout, gsym);
1355         // Make a dynamic relocation if necessary.
1356         int flags = Symbol::NON_PIC_REF;
1357         if (gsym->type() == elfcpp::STT_FUNC)
1358           flags |= Symbol::FUNCTION_CALL;
1359         if (gsym->needs_dynamic_reloc(flags))
1360           {
1361             if (gsym->may_need_copy_reloc())
1362               {
1363                 target->copy_reloc(symtab, layout, object,
1364                                    data_shndx, output_section, gsym,
1365                                    reloc);
1366               }
1367             else
1368               {
1369                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1370                 check_non_pic(object, r_type);
1371                 rela_dyn->add_global(gsym, r_type, output_section, object,
1372                                      data_shndx, reloc.get_r_offset(),
1373                                      reloc.get_r_addend());
1374               }
1375           }
1376       }
1377       break;
1378
1379     case elfcpp::R_POWERPC_GOT16:
1380     case elfcpp::R_POWERPC_GOT16_LO:
1381     case elfcpp::R_POWERPC_GOT16_HI:
1382     case elfcpp::R_POWERPC_GOT16_HA:
1383     case elfcpp::R_PPC64_TOC16:
1384     case elfcpp::R_PPC64_TOC16_LO:
1385     case elfcpp::R_PPC64_TOC16_HI:
1386     case elfcpp::R_PPC64_TOC16_HA:
1387     case elfcpp::R_PPC64_TOC16_DS:
1388     case elfcpp::R_PPC64_TOC16_LO_DS:
1389       {
1390         // The symbol requires a GOT entry.
1391         Output_data_got<size, big_endian>* got;
1392
1393         got = target->got_section(symtab, layout);
1394         if (gsym->final_value_is_known())
1395           got->add_global(gsym, GOT_TYPE_STANDARD);
1396         else
1397           {
1398             // If this symbol is not fully resolved, we need to add a
1399             // dynamic relocation for it.
1400             Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1401             if (gsym->is_from_dynobj()
1402                 || gsym->is_undefined()
1403                 || gsym->is_preemptible())
1404               got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn,
1405                                         elfcpp::R_POWERPC_GLOB_DAT);
1406             else if (!gsym->has_got_offset(GOT_TYPE_STANDARD))
1407               {
1408                 unsigned int off = got->add_constant(0);
1409
1410                 gsym->set_got_offset(GOT_TYPE_STANDARD, off);
1411                 rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
1412                                               got, off, 0);
1413               }
1414           }
1415       }
1416       break;
1417
1418     case elfcpp::R_PPC64_TOC:
1419       // We need a GOT section.
1420       target->got_section(symtab, layout);
1421       break;
1422
1423     case elfcpp::R_POWERPC_GOT_TPREL16:
1424     case elfcpp::R_POWERPC_TLS:
1425       // XXX TLS
1426       break;
1427
1428       // These are relocations which should only be seen by the
1429       // dynamic linker, and should never be seen here.
1430     case elfcpp::R_POWERPC_COPY:
1431     case elfcpp::R_POWERPC_GLOB_DAT:
1432     case elfcpp::R_POWERPC_JMP_SLOT:
1433     case elfcpp::R_POWERPC_RELATIVE:
1434     case elfcpp::R_POWERPC_DTPMOD:
1435       gold_error(_("%s: unexpected reloc %u in object file"),
1436                  object->name().c_str(), r_type);
1437       break;
1438
1439     default:
1440       unsupported_reloc_global(object, r_type, gsym);
1441       break;
1442     }
1443 }
1444
1445 // Process relocations for gc.
1446
1447 template<int size, bool big_endian>
1448 void
1449 Target_powerpc<size, big_endian>::gc_process_relocs(
1450                         Symbol_table* symtab,
1451                         Layout* layout,
1452                         Sized_relobj<size, big_endian>* object,
1453                         unsigned int data_shndx,
1454                         unsigned int,
1455                         const unsigned char* prelocs,
1456                         size_t reloc_count,
1457                         Output_section* output_section,
1458                         bool needs_special_offset_handling,
1459                         size_t local_symbol_count,
1460                         const unsigned char* plocal_symbols)
1461 {
1462   typedef Target_powerpc<size, big_endian> Powerpc;
1463   typedef typename Target_powerpc<size, big_endian>::Scan Scan;
1464
1465   gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
1466     symtab,
1467     layout,
1468     this,
1469     object,
1470     data_shndx,
1471     prelocs,
1472     reloc_count,
1473     output_section,
1474     needs_special_offset_handling,
1475     local_symbol_count,
1476     plocal_symbols);
1477 }
1478
1479 // Scan relocations for a section.
1480
1481 template<int size, bool big_endian>
1482 void
1483 Target_powerpc<size, big_endian>::scan_relocs(
1484                         Symbol_table* symtab,
1485                         Layout* layout,
1486                         Sized_relobj<size, big_endian>* object,
1487                         unsigned int data_shndx,
1488                         unsigned int sh_type,
1489                         const unsigned char* prelocs,
1490                         size_t reloc_count,
1491                         Output_section* output_section,
1492                         bool needs_special_offset_handling,
1493                         size_t local_symbol_count,
1494                         const unsigned char* plocal_symbols)
1495 {
1496   typedef Target_powerpc<size, big_endian> Powerpc;
1497   typedef typename Target_powerpc<size, big_endian>::Scan Scan;
1498   static Output_data_space* sdata;
1499
1500   if (sh_type == elfcpp::SHT_REL)
1501     {
1502       gold_error(_("%s: unsupported REL reloc section"),
1503                  object->name().c_str());
1504       return;
1505     }
1506
1507   // Define _SDA_BASE_ at the start of the .sdata section.
1508   if (sdata == NULL)
1509   {
1510     // layout->find_output_section(".sdata") == NULL
1511     sdata = new Output_data_space(4, "** sdata");
1512     Output_section* os = layout->add_output_section_data(".sdata", 0,
1513                                                          elfcpp::SHF_ALLOC
1514                                                          | elfcpp::SHF_WRITE,
1515                                                          sdata, false);
1516     symtab->define_in_output_data("_SDA_BASE_", NULL,
1517                                   Symbol_table::PREDEFINED,
1518                                   os,
1519                                   32768, 0,
1520                                   elfcpp::STT_OBJECT,
1521                                   elfcpp::STB_LOCAL,
1522                                   elfcpp::STV_HIDDEN, 0,
1523                                   false, false);
1524   }
1525
1526   gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
1527     symtab,
1528     layout,
1529     this,
1530     object,
1531     data_shndx,
1532     prelocs,
1533     reloc_count,
1534     output_section,
1535     needs_special_offset_handling,
1536     local_symbol_count,
1537     plocal_symbols);
1538 }
1539
1540 // Finalize the sections.
1541
1542 template<int size, bool big_endian>
1543 void
1544 Target_powerpc<size, big_endian>::do_finalize_sections(
1545     Layout* layout,
1546     const Input_objects*,
1547     Symbol_table*)
1548 {
1549   // Fill in some more dynamic tags.
1550   Output_data_dynamic* const odyn = layout->dynamic_data();
1551   if (odyn != NULL)
1552     {
1553       if (this->plt_ != NULL
1554           && this->plt_->output_section() != NULL)
1555         {
1556           const Output_data* od = this->plt_->rel_plt();
1557           odyn->add_section_size(elfcpp::DT_PLTRELSZ, od);
1558           odyn->add_section_address(elfcpp::DT_JMPREL, od);
1559           odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA);
1560
1561           odyn->add_section_address(elfcpp::DT_PLTGOT, this->plt_);
1562         }
1563
1564       if (this->rela_dyn_ != NULL
1565           && this->rela_dyn_->output_section() != NULL)
1566         {
1567           const Output_data* od = this->rela_dyn_;
1568           odyn->add_section_address(elfcpp::DT_RELA, od);
1569           odyn->add_section_size(elfcpp::DT_RELASZ, od);
1570           odyn->add_constant(elfcpp::DT_RELAENT,
1571                              elfcpp::Elf_sizes<size>::rela_size);
1572         }
1573
1574       if (!parameters->options().shared())
1575         {
1576           // The value of the DT_DEBUG tag is filled in by the dynamic
1577           // linker at run time, and used by the debugger.
1578           odyn->add_constant(elfcpp::DT_DEBUG, 0);
1579         }
1580     }
1581
1582   // Emit any relocs we saved in an attempt to avoid generating COPY
1583   // relocs.
1584   if (this->copy_relocs_.any_saved_relocs())
1585     this->copy_relocs_.emit(this->rela_dyn_section(layout));
1586 }
1587
1588 // Perform a relocation.
1589
1590 template<int size, bool big_endian>
1591 inline bool
1592 Target_powerpc<size, big_endian>::Relocate::relocate(
1593                         const Relocate_info<size, big_endian>* relinfo,
1594                         Target_powerpc* target,
1595                         Output_section*,
1596                         size_t relnum,
1597                         const elfcpp::Rela<size, big_endian>& rela,
1598                         unsigned int r_type,
1599                         const Sized_symbol<size>* gsym,
1600                         const Symbol_value<size>* psymval,
1601                         unsigned char* view,
1602                         typename elfcpp::Elf_types<size>::Elf_Addr address,
1603                         section_size_type /* view_size */)
1604 {
1605   const unsigned int toc_base_offset = 0x8000;
1606   typedef Powerpc_relocate_functions<size, big_endian> Reloc;
1607
1608   // Pick the value to use for symbols defined in shared objects.
1609   Symbol_value<size> symval;
1610   if (gsym != NULL
1611       && gsym->use_plt_offset(r_type == elfcpp::R_POWERPC_REL24
1612                               || r_type == elfcpp::R_PPC_LOCAL24PC
1613                               || r_type == elfcpp::R_PPC_REL16
1614                               || r_type == elfcpp::R_PPC_REL16_LO
1615                               || r_type == elfcpp::R_PPC_REL16_HI
1616                               || r_type == elfcpp::R_PPC_REL16_HA))
1617     {
1618       elfcpp::Elf_Xword value;
1619
1620       value = target->plt_section()->address() + gsym->plt_offset();
1621
1622       symval.set_output_value(value);
1623
1624       psymval = &symval;
1625     }
1626
1627   const Sized_relobj<size, big_endian>* object = relinfo->object;
1628   elfcpp::Elf_Xword addend = rela.get_r_addend();
1629
1630   // Get the GOT offset if needed.  Unlike i386 and x86_64, our GOT
1631   // pointer points to the beginning, not the end, of the table.
1632   // So we just use the plain offset.
1633   bool have_got_offset = false;
1634   unsigned int got_offset = 0;
1635   unsigned int got2_offset = 0;
1636   switch (r_type)
1637     {
1638     case elfcpp::R_PPC64_TOC16:
1639     case elfcpp::R_PPC64_TOC16_LO:
1640     case elfcpp::R_PPC64_TOC16_HI:
1641     case elfcpp::R_PPC64_TOC16_HA:
1642     case elfcpp::R_PPC64_TOC16_DS:
1643     case elfcpp::R_PPC64_TOC16_LO_DS:
1644         // Subtract the TOC base address.
1645         addend -= target->toc_section()->address() + toc_base_offset;
1646         /* FALLTHRU */
1647
1648     case elfcpp::R_POWERPC_GOT16:
1649     case elfcpp::R_POWERPC_GOT16_LO:
1650     case elfcpp::R_POWERPC_GOT16_HI:
1651     case elfcpp::R_POWERPC_GOT16_HA:
1652     case elfcpp::R_PPC64_GOT16_DS:
1653     case elfcpp::R_PPC64_GOT16_LO_DS:
1654       if (gsym != NULL)
1655         {
1656           gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
1657           got_offset = gsym->got_offset(GOT_TYPE_STANDARD);
1658         }
1659       else
1660         {
1661           unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
1662           gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
1663           got_offset = object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
1664         }
1665       have_got_offset = true;
1666       break;
1667
1668       // R_PPC_PLTREL24 is rather special.  If non-zero,
1669       // the addend specifies the GOT pointer offset within .got2.
1670     case elfcpp::R_PPC_PLTREL24:
1671       if (addend >= 32768)
1672         {
1673           Output_data_space* got2;
1674           got2 = target->got2_section();
1675           got2_offset = got2->offset();
1676           addend += got2_offset;
1677         }
1678       have_got_offset = true;
1679       break;
1680
1681     default:
1682       break;
1683     }
1684
1685   switch (r_type)
1686     {
1687     case elfcpp::R_POWERPC_NONE:
1688     case elfcpp::R_POWERPC_GNU_VTINHERIT:
1689     case elfcpp::R_POWERPC_GNU_VTENTRY:
1690       break;
1691
1692     case elfcpp::R_POWERPC_REL32:
1693       Reloc::rel32(view, object, psymval, addend, address);
1694       break;
1695
1696     case elfcpp::R_POWERPC_REL24:
1697       Reloc::rel24(view, object, psymval, addend, address);
1698       break;
1699
1700     case elfcpp::R_POWERPC_REL14:
1701       Reloc::rel14(view, object, psymval, addend, address);
1702       break;
1703
1704     case elfcpp::R_PPC_PLTREL24:
1705       Reloc::rel24(view, object, psymval, addend, address);
1706       break;
1707
1708     case elfcpp::R_PPC_LOCAL24PC:
1709       Reloc::rel24(view, object, psymval, addend, address);
1710       break;
1711
1712     case elfcpp::R_PPC64_ADDR64:
1713       if (!parameters->options().output_is_position_independent())
1714         Relocate_functions<size, big_endian>::rela64(view, object,
1715                                                      psymval, addend);
1716       break;
1717
1718     case elfcpp::R_POWERPC_ADDR32:
1719       if (!parameters->options().output_is_position_independent())
1720         Relocate_functions<size, big_endian>::rela32(view, object,
1721                                                      psymval, addend);
1722       break;
1723
1724     case elfcpp::R_POWERPC_ADDR16_LO:
1725       Reloc::addr16_lo(view, object, psymval, addend);
1726       break;
1727
1728     case elfcpp::R_POWERPC_ADDR16_HI:
1729       Reloc::addr16_hi(view, object, psymval, addend);
1730       break;
1731
1732     case elfcpp::R_POWERPC_ADDR16_HA:
1733       Reloc::addr16_ha(view, object, psymval, addend);
1734       break;
1735
1736     case elfcpp::R_PPC_REL16_LO:
1737       Reloc::rel16_lo(view, object, psymval, addend, address);
1738       break;
1739
1740     case elfcpp::R_PPC_REL16_HI:
1741       Reloc::rel16_lo(view, object, psymval, addend, address);
1742       break;
1743
1744     case elfcpp::R_PPC_REL16_HA:
1745       Reloc::rel16_ha(view, object, psymval, addend, address);
1746       break;
1747
1748     case elfcpp::R_POWERPC_GOT16:
1749       Reloc::addr16(view, got_offset, addend);
1750       break;
1751
1752     case elfcpp::R_POWERPC_GOT16_LO:
1753       Reloc::addr16_lo(view, got_offset, addend);
1754       break;
1755
1756     case elfcpp::R_POWERPC_GOT16_HI:
1757       Reloc::addr16_hi(view, got_offset, addend);
1758       break;
1759
1760     case elfcpp::R_POWERPC_GOT16_HA:
1761       Reloc::addr16_ha(view, got_offset, addend);
1762       break;
1763
1764     case elfcpp::R_PPC64_TOC16:
1765       Reloc::addr16(view, got_offset, addend);
1766       break;
1767
1768     case elfcpp::R_PPC64_TOC16_LO:
1769       Reloc::addr16_lo(view, got_offset, addend);
1770       break;
1771
1772     case elfcpp::R_PPC64_TOC16_HI:
1773       Reloc::addr16_hi(view, got_offset, addend);
1774       break;
1775
1776     case elfcpp::R_PPC64_TOC16_HA:
1777       Reloc::addr16_ha(view, got_offset, addend);
1778       break;
1779
1780     case elfcpp::R_PPC64_TOC16_DS:
1781     case elfcpp::R_PPC64_TOC16_LO_DS:
1782       Reloc::addr16_ds(view, got_offset, addend);
1783       break;
1784
1785     case elfcpp::R_PPC64_TOC:
1786       {
1787         elfcpp::Elf_types<64>::Elf_Addr value;
1788         value = target->toc_section()->address() + toc_base_offset;
1789         Relocate_functions<64, false>::rela64(view, value, addend);
1790       }
1791       break;
1792
1793     case elfcpp::R_POWERPC_COPY:
1794     case elfcpp::R_POWERPC_GLOB_DAT:
1795     case elfcpp::R_POWERPC_JMP_SLOT:
1796     case elfcpp::R_POWERPC_RELATIVE:
1797       // This is an outstanding tls reloc, which is unexpected when
1798       // linking.
1799     case elfcpp::R_POWERPC_DTPMOD:
1800       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1801                              _("unexpected reloc %u in object file"),
1802                              r_type);
1803       break;
1804
1805     default:
1806       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1807                              _("unsupported reloc %u"),
1808                              r_type);
1809       break;
1810     }
1811
1812   return true;
1813 }
1814
1815 // Perform a TLS relocation.
1816
1817 template<int size, bool big_endian>
1818 inline void
1819 Target_powerpc<size, big_endian>::Relocate::relocate_tls(
1820                         const Relocate_info<size, big_endian>* relinfo,
1821                         Target_powerpc<size, big_endian>* target,
1822                         size_t relnum,
1823                         const elfcpp::Rela<size, big_endian>& rela,
1824                         unsigned int r_type,
1825                         const Sized_symbol<size>* gsym,
1826                         const Symbol_value<size>* psymval,
1827                         unsigned char* view,
1828                         typename elfcpp::Elf_types<size>::Elf_Addr address,
1829                         section_size_type)
1830 {
1831   Output_segment* tls_segment = relinfo->layout->tls_segment();
1832   typedef Powerpc_relocate_functions<size, big_endian> Reloc;
1833   const Sized_relobj<size, big_endian>* object = relinfo->object;
1834
1835   const elfcpp::Elf_Xword addend = rela.get_r_addend();
1836   typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(object, 0);
1837
1838   const bool is_final =
1839     (gsym == NULL
1840      ? !parameters->options().output_is_position_independent()
1841      : gsym->final_value_is_known());
1842   const tls::Tls_optimization optimized_type
1843       = optimize_tls_reloc(is_final, r_type);
1844
1845   switch (r_type)
1846     {
1847       // XXX
1848     }
1849 }
1850
1851 // Relocate section data.
1852
1853 template<int size, bool big_endian>
1854 void
1855 Target_powerpc<size, big_endian>::relocate_section(
1856                         const Relocate_info<size, big_endian>* relinfo,
1857                         unsigned int sh_type,
1858                         const unsigned char* prelocs,
1859                         size_t reloc_count,
1860                         Output_section* output_section,
1861                         bool needs_special_offset_handling,
1862                         unsigned char* view,
1863                         typename elfcpp::Elf_types<size>::Elf_Addr address,
1864                         section_size_type view_size,
1865                         const Reloc_symbol_changes* reloc_symbol_changes)
1866 {
1867   typedef Target_powerpc<size, big_endian> Powerpc;
1868   typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate;
1869
1870   gold_assert(sh_type == elfcpp::SHT_RELA);
1871
1872   gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA,
1873     Powerpc_relocate>(
1874     relinfo,
1875     this,
1876     prelocs,
1877     reloc_count,
1878     output_section,
1879     needs_special_offset_handling,
1880     view,
1881     address,
1882     view_size,
1883     reloc_symbol_changes);
1884 }
1885
1886 // Return the size of a relocation while scanning during a relocatable
1887 // link.
1888
1889 template<int size, bool big_endian>
1890 unsigned int
1891 Target_powerpc<size, big_endian>::Relocatable_size_for_reloc::get_size_for_reloc(
1892     unsigned int,
1893     Relobj*)
1894 {
1895   // We are always SHT_RELA, so we should never get here.
1896   gold_unreachable();
1897   return 0;
1898 }
1899
1900 // Scan the relocs during a relocatable link.
1901
1902 template<int size, bool big_endian>
1903 void
1904 Target_powerpc<size, big_endian>::scan_relocatable_relocs(
1905                         Symbol_table* symtab,
1906                         Layout* layout,
1907                         Sized_relobj<size, big_endian>* object,
1908                         unsigned int data_shndx,
1909                         unsigned int sh_type,
1910                         const unsigned char* prelocs,
1911                         size_t reloc_count,
1912                         Output_section* output_section,
1913                         bool needs_special_offset_handling,
1914                         size_t local_symbol_count,
1915                         const unsigned char* plocal_symbols,
1916                         Relocatable_relocs* rr)
1917 {
1918   gold_assert(sh_type == elfcpp::SHT_RELA);
1919
1920   typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA,
1921     Relocatable_size_for_reloc> Scan_relocatable_relocs;
1922
1923   gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA,
1924       Scan_relocatable_relocs>(
1925     symtab,
1926     layout,
1927     object,
1928     data_shndx,
1929     prelocs,
1930     reloc_count,
1931     output_section,
1932     needs_special_offset_handling,
1933     local_symbol_count,
1934     plocal_symbols,
1935     rr);
1936 }
1937
1938 // Relocate a section during a relocatable link.
1939
1940 template<int size, bool big_endian>
1941 void
1942 Target_powerpc<size, big_endian>::relocate_for_relocatable(
1943     const Relocate_info<size, big_endian>* relinfo,
1944     unsigned int sh_type,
1945     const unsigned char* prelocs,
1946     size_t reloc_count,
1947     Output_section* output_section,
1948     off_t offset_in_output_section,
1949     const Relocatable_relocs* rr,
1950     unsigned char* view,
1951     typename elfcpp::Elf_types<size>::Elf_Addr view_address,
1952     section_size_type view_size,
1953     unsigned char* reloc_view,
1954     section_size_type reloc_view_size)
1955 {
1956   gold_assert(sh_type == elfcpp::SHT_RELA);
1957
1958   gold::relocate_for_relocatable<size, big_endian, elfcpp::SHT_RELA>(
1959     relinfo,
1960     prelocs,
1961     reloc_count,
1962     output_section,
1963     offset_in_output_section,
1964     rr,
1965     view,
1966     view_address,
1967     view_size,
1968     reloc_view,
1969     reloc_view_size);
1970 }
1971
1972 // Return the value to use for a dynamic which requires special
1973 // treatment.  This is how we support equality comparisons of function
1974 // pointers across shared library boundaries, as described in the
1975 // processor specific ABI supplement.
1976
1977 template<int size, bool big_endian>
1978 uint64_t
1979 Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
1980 {
1981   gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
1982   return this->plt_section()->address() + gsym->plt_offset();
1983 }
1984
1985 // The selector for powerpc object files.
1986
1987 template<int size, bool big_endian>
1988 class Target_selector_powerpc : public Target_selector
1989 {
1990 public:
1991   Target_selector_powerpc()
1992     : Target_selector(elfcpp::EM_NONE, size, big_endian,
1993                       (size == 64 ?
1994                        (big_endian ? "elf64-powerpc" : "elf64-powerpcle") :
1995                        (big_endian ? "elf32-powerpc" : "elf32-powerpcle")))
1996   { }
1997
1998   Target* do_recognize(int machine, int, int)
1999   {
2000     switch (size)
2001       {
2002       case 64:
2003         if (machine != elfcpp::EM_PPC64)
2004           return NULL;
2005         break;
2006
2007       case 32:
2008         if (machine != elfcpp::EM_PPC)
2009           return NULL;
2010         break;
2011
2012       default:
2013         return NULL;
2014       }
2015
2016     return this->instantiate_target();
2017   }
2018
2019   Target* do_instantiate_target()
2020   { return new Target_powerpc<size, big_endian>(); }
2021 };
2022
2023 Target_selector_powerpc<32, true> target_selector_ppc32;
2024 Target_selector_powerpc<32, false> target_selector_ppc32le;
2025 Target_selector_powerpc<64, true> target_selector_ppc64;
2026 Target_selector_powerpc<64, false> target_selector_ppc64le;
2027
2028 } // End anonymous namespace.