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     inline bool
 187     local_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
 188                                         Target_powerpc* ,
 189                                         Sized_relobj<size, big_endian>* ,
 190                                         unsigned int ,
 191                                         Output_section* ,
 192                                         const elfcpp::Rela<size, big_endian>& ,
 193                                         unsigned int ,
 194                                         const elfcpp::Sym<size, big_endian>&)
 195     { return false; }
 196
 197     inline bool
 198     global_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
 199                                          Target_powerpc* ,
 200                                          Sized_relobj<size, big_endian>* ,
 201                                          unsigned int ,
 202                                          Output_section* ,
 203                                          const elfcpp::Rela<size,
 204                                                             big_endian>& ,
 205                                          unsigned int , Symbol*)
 206     { return false; }
 207
 208   private:
 209     static void
 210     unsupported_reloc_local(Sized_relobj<size, big_endian>*,
 211                             unsigned int r_type);
 212
 213     static void
 214     unsupported_reloc_global(Sized_relobj<size, big_endian>*,
 215                              unsigned int r_type, Symbol*);
 216
 217     static void
 218     generate_tls_call(Symbol_table* symtab, Layout* layout,
 219                       Target_powerpc* target);
 220
 221     void
 222     check_non_pic(Relobj*, unsigned int r_type);
 223
 224     // Whether we have issued an error about a non-PIC compilation.
 225     bool issued_non_pic_error_;
 226   };
 227
 228   // The class which implements relocation.
 229   class Relocate
 230   {
 231    public:
 232     // Do a relocation.  Return false if the caller should not issue
 233     // any warnings about this relocation.
 234     inline bool
 235     relocate(const Relocate_info<size, big_endian>*, Target_powerpc*,
 236              Output_section*, size_t relnum,
 237              const elfcpp::Rela<size, big_endian>&,
 238              unsigned int r_type, const Sized_symbol<size>*,
 239              const Symbol_value<size>*,
 240              unsigned char*,
 241              typename elfcpp::Elf_types<size>::Elf_Addr,
 242              section_size_type);
 243
 244    private:
 245     // Do a TLS relocation.
 246     inline void
 247     relocate_tls(const Relocate_info<size, big_endian>*,
 248                  Target_powerpc* target,
 249                  size_t relnum, const elfcpp::Rela<size, big_endian>&,
 250                  unsigned int r_type, const Sized_symbol<size>*,
 251                  const Symbol_value<size>*,
 252                  unsigned char*,
 253                  typename elfcpp::Elf_types<size>::Elf_Addr,
 254                  section_size_type);
 255   };
 256
 257   // A class which returns the size required for a relocation type,
 258   // used while scanning relocs during a relocatable link.
 259   class Relocatable_size_for_reloc
 260   {
 261    public:
 262     unsigned int
 263     get_size_for_reloc(unsigned int, Relobj*);
 264   };
 265
 266   // Get the GOT section, creating it if necessary.
 267   Output_data_got<size, big_endian>*
 268   got_section(Symbol_table*, Layout*);
 269
 270   Output_data_space*
 271   got2_section() const
 272   {
 273     gold_assert (this->got2_ != NULL);
 274     return this->got2_;
 275   }
 276
 277   // Get the TOC section.
 278   Output_data_space*
 279   toc_section() const
 280   {
 281     gold_assert (this->toc_ != NULL);
 282     return this->toc_;
 283   }
 284
 285   // Create a PLT entry for a global symbol.
 286   void
 287   make_plt_entry(Symbol_table*, Layout*, Symbol*);
 288
 289   // Create a GOT entry for the TLS module index.
 290   unsigned int
 291   got_mod_index_entry(Symbol_table* symtab, Layout* layout,
 292                       Sized_relobj<size, big_endian>* object);
 293
 294   // Get the PLT section.
 295   const Output_data_plt_powerpc<size, big_endian>*
 296   plt_section() const
 297   {
 298     gold_assert(this->plt_ != NULL);
 299     return this->plt_;
 300   }
 301
 302   // Get the dynamic reloc section, creating it if necessary.
 303   Reloc_section*
 304   rela_dyn_section(Layout*);
 305
 306   // Copy a relocation against a global symbol.
 307   void
 308   copy_reloc(Symbol_table* symtab, Layout* layout,
 309              Sized_relobj<size, big_endian>* object,
 310              unsigned int shndx, Output_section* output_section,
 311              Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc)
 312   {
 313     this->copy_relocs_.copy_reloc(symtab, layout,
 314                                   symtab->get_sized_symbol<size>(sym),
 315                                   object, shndx, output_section,
 316                                   reloc, this->rela_dyn_section(layout));
 317   }
 318
 319   // Information about this specific target which we pass to the
 320   // general Target structure.
 321   static Target::Target_info powerpc_info;
 322
 323   // The types of GOT entries needed for this platform.
 324   enum Got_type
 325   {
 326     GOT_TYPE_STANDARD = 0,      // GOT entry for a regular symbol
 327     GOT_TYPE_TLS_OFFSET = 1,    // GOT entry for TLS offset
 328     GOT_TYPE_TLS_PAIR = 2,      // GOT entry for TLS module/offset pair
 329   };
 330
 331   // The GOT section.
 332   Output_data_got<size, big_endian>* got_;
 333   // The GOT2 section.
 334   Output_data_space* got2_;
 335   // The TOC section.
 336   Output_data_space* toc_;
 337   // The PLT section.
 338   Output_data_plt_powerpc<size, big_endian>* plt_;
 339   // The dynamic reloc section.
 340   Reloc_section* rela_dyn_;
 341   // Relocs saved to avoid a COPY reloc.
 342   Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
 343   // Space for variables copied with a COPY reloc.
 344   Output_data_space* dynbss_;
 345   // Offset of the GOT entry for the TLS module index;
 346   unsigned int got_mod_index_offset_;
 347 };
 348
 349 template<>
 350 Target::Target_info Target_powerpc<32, true>::powerpc_info =
 351 {
 352   32,                   // size
 353   true,                 // is_big_endian
 354   elfcpp::EM_PPC,       // machine_code
 355   false,                // has_make_symbol
 356   false,                // has_resolve
 357   false,                // has_code_fill
 358   true,                 // is_default_stack_executable
 359   '\0',                 // wrap_char
 360   "/usr/lib/ld.so.1",   // dynamic_linker
 361   0x10000000,           // default_text_segment_address
 362   64 * 1024,            // abi_pagesize (overridable by -z max-page-size)
 363   4 * 1024,             // common_pagesize (overridable by -z common-page-size)
 364   elfcpp::SHN_UNDEF,    // small_common_shndx
 365   elfcpp::SHN_UNDEF,    // large_common_shndx
 366   0,                    // small_common_section_flags
 367   0,                    // large_common_section_flags
 368   NULL,                 // attributes_section
 369   NULL                  // attributes_vendor
 370 };
 371
 372 template<>
 373 Target::Target_info Target_powerpc<32, false>::powerpc_info =
 374 {
 375   32,                   // size
 376   false,                // is_big_endian
 377   elfcpp::EM_PPC,       // machine_code
 378   false,                // has_make_symbol
 379   false,                // has_resolve
 380   false,                // has_code_fill
 381   true,                 // is_default_stack_executable
 382   '\0',                 // wrap_char
 383   "/usr/lib/ld.so.1",   // dynamic_linker
 384   0x10000000,           // default_text_segment_address
 385   64 * 1024,            // abi_pagesize (overridable by -z max-page-size)
 386   4 * 1024,             // common_pagesize (overridable by -z common-page-size)
 387   elfcpp::SHN_UNDEF,    // small_common_shndx
 388   elfcpp::SHN_UNDEF,    // large_common_shndx
 389   0,                    // small_common_section_flags
 390   0,                    // large_common_section_flags
 391   NULL,                 // attributes_section
 392   NULL                  // attributes_vendor
 393 };
 394
 395 template<>
 396 Target::Target_info Target_powerpc<64, true>::powerpc_info =
 397 {
 398   64,                   // size
 399   true,                 // is_big_endian
 400   elfcpp::EM_PPC64,     // machine_code
 401   false,                // has_make_symbol
 402   false,                // has_resolve
 403   false,                // has_code_fill
 404   true,                 // is_default_stack_executable
 405   '\0',                 // wrap_char
 406   "/usr/lib/ld.so.1",   // dynamic_linker
 407   0x10000000,           // default_text_segment_address
 408   64 * 1024,            // abi_pagesize (overridable by -z max-page-size)
 409   8 * 1024,             // common_pagesize (overridable by -z common-page-size)
 410   elfcpp::SHN_UNDEF,    // small_common_shndx
 411   elfcpp::SHN_UNDEF,    // large_common_shndx
 412   0,                    // small_common_section_flags
 413   0,                    // large_common_section_flags
 414   NULL,                 // attributes_section
 415   NULL                  // attributes_vendor
 416 };
 417
 418 template<>
 419 Target::Target_info Target_powerpc<64, false>::powerpc_info =
 420 {
 421   64,                   // size
 422   false,                // is_big_endian
 423   elfcpp::EM_PPC64,     // machine_code
 424   false,                // has_make_symbol
 425   false,                // has_resolve
 426   false,                // has_code_fill
 427   true,                 // is_default_stack_executable
 428   '\0',                 // wrap_char
 429   "/usr/lib/ld.so.1",   // dynamic_linker
 430   0x10000000,           // default_text_segment_address
 431   64 * 1024,            // abi_pagesize (overridable by -z max-page-size)
 432   8 * 1024,             // common_pagesize (overridable by -z common-page-size)
 433   elfcpp::SHN_UNDEF,    // small_common_shndx
 434   elfcpp::SHN_UNDEF,    // large_common_shndx
 435   0,                    // small_common_section_flags
 436   0,                    // large_common_section_flags
 437   NULL,                 // attributes_section
 438   NULL                  // attributes_vendor
 439 };
 440
 441 template<int size, bool big_endian>
 442 class Powerpc_relocate_functions
 443 {
 444 private:
 445   // Do a simple relocation with the addend in the relocation.
 446   template<int valsize>
 447   static inline void
 448   rela(unsigned char* view,
 449        unsigned int right_shift,
 450        elfcpp::Elf_Xword dst_mask,
 451        typename elfcpp::Swap<size, big_endian>::Valtype value,
 452        typename elfcpp::Swap<size, 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 = ((value + 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.
 467   template<int valsize>
 468   static inline void
 469   rela(unsigned char* view,
 470        unsigned int right_shift,
 471        elfcpp::Elf_Xword dst_mask,
 472        const Sized_relobj<size, big_endian>* object,
 473        const Symbol_value<size>* psymval,
 474        typename elfcpp::Swap<valsize, big_endian>::Valtype addend)
 475   {
 476     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 477     Valtype* wv = reinterpret_cast<Valtype*>(view);
 478     Valtype val = elfcpp::Swap<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<valsize, big_endian>::writeval(wv, val | reloc);
 485   }
 486
 487   // Do a simple relocation using a symbol value with the addend in
 488   // the relocation, unaligned.
 489   template<int valsize>
 490   static inline void
 491   rela_ua(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   {
 497     typedef typename elfcpp::Swap_unaligned<valsize,
 498             big_endian>::Valtype Valtype;
 499     unsigned char* wv = view;
 500     Valtype val = elfcpp::Swap_unaligned<valsize, big_endian>::readval(wv);
 501     Valtype reloc = (psymval->value(object, addend) >> right_shift);
 502
 503     val &= ~dst_mask;
 504     reloc &= dst_mask;
 505
 506     elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, val | reloc);
 507   }
 508
 509   // Do a simple PC relative relocation with a Symbol_value with the
 510   // addend in the relocation.
 511   template<int valsize>
 512   static inline void
 513   pcrela(unsigned char* view, unsigned int right_shift,
 514          elfcpp::Elf_Xword dst_mask,
 515          const Sized_relobj<size, big_endian>* object,
 516          const Symbol_value<size>* psymval,
 517          typename elfcpp::Swap<size, big_endian>::Valtype addend,
 518          typename elfcpp::Elf_types<size>::Elf_Addr address)
 519   {
 520     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 521     Valtype* wv = reinterpret_cast<Valtype*>(view);
 522     Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
 523     Valtype reloc = ((psymval->value(object, addend) - address)
 524                      >> right_shift);
 525
 526     val &= ~dst_mask;
 527     reloc &= dst_mask;
 528
 529     elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc);
 530   }
 531
 532   template<int valsize>
 533   static inline void
 534   pcrela_unaligned(unsigned char* view,
 535                    const Sized_relobj<size, big_endian>* object,
 536                    const Symbol_value<size>* psymval,
 537                    typename elfcpp::Swap<size, big_endian>::Valtype addend,
 538                    typename elfcpp::Elf_types<size>::Elf_Addr address)
 539   {
 540     typedef typename elfcpp::Swap_unaligned<valsize,
 541             big_endian>::Valtype Valtype;
 542     unsigned char* wv = view;
 543     Valtype reloc = (psymval->value(object, addend) - address);
 544
 545     elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, reloc);
 546   }
 547
 548   typedef Powerpc_relocate_functions<size, big_endian> This;
 549   typedef Relocate_functions<size, big_endian> This_reloc;
 550 public:
 551   // R_POWERPC_REL32: (Symbol + Addend - Address)
 552   static inline void
 553   rel32(unsigned char* view,
 554         const Sized_relobj<size, big_endian>* object,
 555         const Symbol_value<size>* psymval,
 556         typename elfcpp::Elf_types<size>::Elf_Addr addend,
 557         typename elfcpp::Elf_types<size>::Elf_Addr address)
 558   { This_reloc::pcrela32(view, object, psymval, addend, address); }
 559
 560   // R_POWERPC_REL24: (Symbol + Addend - Address) & 0x3fffffc
 561   static inline void
 562   rel24(unsigned char* view,
 563         const Sized_relobj<size, big_endian>* object,
 564         const Symbol_value<size>* psymval,
 565         typename elfcpp::Elf_types<size>::Elf_Addr addend,
 566         typename elfcpp::Elf_types<size>::Elf_Addr address)
 567   {
 568     This::template pcrela<32>(view, 0, 0x03fffffc, object,
 569                               psymval, addend, address);
 570   }
 571
 572   // R_POWERPC_REL14: (Symbol + Addend - Address) & 0xfffc
 573   static inline void
 574   rel14(unsigned char* view,
 575         const Sized_relobj<size, big_endian>* object,
 576         const Symbol_value<size>* psymval,
 577         typename elfcpp::Elf_types<size>::Elf_Addr addend,
 578         typename elfcpp::Elf_types<size>::Elf_Addr address)
 579   {
 580     This::template pcrela<32>(view, 0, 0x0000fffc, object,
 581                               psymval, addend, address);
 582   }
 583
 584   // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff
 585   static inline void
 586   addr16(unsigned char* view,
 587          typename elfcpp::Elf_types<size>::Elf_Addr value,
 588          typename elfcpp::Elf_types<size>::Elf_Addr addend)
 589   { This_reloc::rela16(view, value, addend); }
 590
 591   static inline void
 592   addr16(unsigned char* view,
 593          const Sized_relobj<size, big_endian>* object,
 594          const Symbol_value<size>* psymval,
 595          typename elfcpp::Elf_types<size>::Elf_Addr addend)
 596   { This_reloc::rela16(view, object, psymval, addend); }
 597
 598   // R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc
 599   static inline void
 600   addr16_ds(unsigned char* view,
 601             typename elfcpp::Elf_types<size>::Elf_Addr value,
 602             typename elfcpp::Elf_types<size>::Elf_Addr addend)
 603   {
 604     This::template rela<16>(view, 0, 0xfffc, value, addend);
 605   }
 606
 607   // R_POWERPC_ADDR16_LO: (Symbol + Addend) & 0xffff
 608   static inline void
 609   addr16_lo(unsigned char* view,
 610          typename elfcpp::Elf_types<size>::Elf_Addr value,
 611          typename elfcpp::Elf_types<size>::Elf_Addr addend)
 612   { This_reloc::rela16(view, value, addend); }
 613
 614   static inline void
 615   addr16_lo(unsigned char* view,
 616             const Sized_relobj<size, big_endian>* object,
 617             const Symbol_value<size>* psymval,
 618             typename elfcpp::Elf_types<size>::Elf_Addr addend)
 619   { This_reloc::rela16(view, object, psymval, addend); }
 620
 621   // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff
 622   static inline void
 623   addr16_hi(unsigned char* view,
 624             typename elfcpp::Elf_types<size>::Elf_Addr value,
 625             typename elfcpp::Elf_types<size>::Elf_Addr addend)
 626   {
 627     This::template rela<16>(view, 16, 0xffff, value, addend);
 628   }
 629
 630   static inline void
 631   addr16_hi(unsigned char* view,
 632             const Sized_relobj<size, big_endian>* object,
 633             const Symbol_value<size>* psymval,
 634             typename elfcpp::Elf_types<size>::Elf_Addr addend)
 635   {
 636     This::template rela<16>(view, 16, 0xffff, object, psymval, addend);
 637   }
 638
 639   // R_POWERPC_ADDR16_HA: Same as R_POWERPC_ADDR16_HI except that if the
 640   //                      final value of the low 16 bits of the
 641   //                      relocation is negative, add one.
 642   static inline void
 643   addr16_ha(unsigned char* view,
 644             typename elfcpp::Elf_types<size>::Elf_Addr value,
 645             typename elfcpp::Elf_types<size>::Elf_Addr addend)
 646   {
 647     typename elfcpp::Elf_types<size>::Elf_Addr reloc;
 648
 649     reloc = value + addend;
 650
 651     if (reloc & 0x8000)
 652       reloc += 0x10000;
 653     reloc >>= 16;
 654
 655     elfcpp::Swap<16, big_endian>::writeval(view, reloc);
 656   }
 657
 658   static inline void
 659   addr16_ha(unsigned char* view,
 660             const Sized_relobj<size, big_endian>* object,
 661             const Symbol_value<size>* psymval,
 662             typename elfcpp::Elf_types<size>::Elf_Addr addend)
 663   {
 664     typename elfcpp::Elf_types<size>::Elf_Addr reloc;
 665
 666     reloc = psymval->value(object, addend);
 667
 668     if (reloc & 0x8000)
 669       reloc += 0x10000;
 670     reloc >>= 16;
 671
 672     elfcpp::Swap<16, big_endian>::writeval(view, reloc);
 673   }
 674
 675   // R_PPC_REL16: (Symbol + Addend - Address) & 0xffff
 676   static inline void
 677   rel16(unsigned char* view,
 678         const Sized_relobj<size, big_endian>* object,
 679         const Symbol_value<size>* psymval,
 680         typename elfcpp::Elf_types<size>::Elf_Addr addend,
 681         typename elfcpp::Elf_types<size>::Elf_Addr address)
 682   { This_reloc::pcrela16(view, object, psymval, addend, address); }
 683
 684   // R_PPC_REL16_LO: (Symbol + Addend - Address) & 0xffff
 685   static inline void
 686   rel16_lo(unsigned char* view,
 687            const Sized_relobj<size, big_endian>* object,
 688            const Symbol_value<size>* psymval,
 689            typename elfcpp::Elf_types<size>::Elf_Addr addend,
 690            typename elfcpp::Elf_types<size>::Elf_Addr address)
 691   { This_reloc::pcrela16(view, object, psymval, addend, address); }
 692
 693   // R_PPC_REL16_HI: ((Symbol + Addend - Address) >> 16) & 0xffff
 694   static inline void
 695   rel16_hi(unsigned char* view,
 696            const Sized_relobj<size, big_endian>* object,
 697            const Symbol_value<size>* psymval,
 698            typename elfcpp::Elf_types<size>::Elf_Addr addend,
 699            typename elfcpp::Elf_types<size>::Elf_Addr address)
 700   {
 701     This::template pcrela<16>(view, 16, 0xffff, object,
 702                               psymval, addend, address);
 703   }
 704
 705   // R_PPC_REL16_HA: Same as R_PPC_REL16_HI except that if the
 706   //                 final value of the low 16 bits of the
 707   //                 relocation is negative, add one.
 708   static inline void
 709   rel16_ha(unsigned char* view,
 710            const Sized_relobj<size, big_endian>* object,
 711            const Symbol_value<size>* psymval,
 712            typename elfcpp::Elf_types<size>::Elf_Addr addend,
 713            typename elfcpp::Elf_types<size>::Elf_Addr address)
 714   {
 715     typename elfcpp::Elf_types<size>::Elf_Addr reloc;
 716
 717     reloc = (psymval->value(object, addend) - address);
 718     if (reloc & 0x8000)
 719       reloc += 0x10000;
 720     reloc >>= 16;
 721
 722     elfcpp::Swap<16, big_endian>::writeval(view, reloc);
 723   }
 724 };
 725
 726 // Get the GOT section, creating it if necessary.
 727
 728 template<int size, bool big_endian>
 729 Output_data_got<size, big_endian>*
 730 Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab,
 731                                               Layout* layout)
 732 {
 733   if (this->got_ == NULL)
 734     {
 735       gold_assert(symtab != NULL && layout != NULL);
 736
 737       this->got_ = new Output_data_got<size, big_endian>();
 738
 739       layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
 740                                       elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
 741                                       this->got_, false, false, false, false);
 742
 743       // Create the GOT2 or TOC in the .got section.
 744       if (size == 32)
 745         {
 746           this->got2_ = new Output_data_space(4, "** GOT2");
 747           layout->add_output_section_data(".got2", elfcpp::SHT_PROGBITS,
 748                                           elfcpp::SHF_ALLOC
 749                                           | elfcpp::SHF_WRITE,
 750                                           this->got2_, false, false, false,
 751                                           false);
 752         }
 753       else
 754         {
 755           this->toc_ = new Output_data_space(8, "** TOC");
 756           layout->add_output_section_data(".toc", elfcpp::SHT_PROGBITS,
 757                                           elfcpp::SHF_ALLOC
 758                                           | elfcpp::SHF_WRITE,
 759                                           this->toc_, false, false, false,
 760                                           false);
 761         }
 762
 763       // Define _GLOBAL_OFFSET_TABLE_ at the start of the .got section.
 764       symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
 765                                     Symbol_table::PREDEFINED,
 766                                     this->got_,
 767                                     0, 0, elfcpp::STT_OBJECT,
 768                                     elfcpp::STB_LOCAL,
 769                                     elfcpp::STV_HIDDEN, 0,
 770                                     false, false);
 771     }
 772
 773   return this->got_;
 774 }
 775
 776 // Get the dynamic reloc section, creating it if necessary.
 777
 778 template<int size, bool big_endian>
 779 typename Target_powerpc<size, big_endian>::Reloc_section*
 780 Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout)
 781 {
 782   if (this->rela_dyn_ == NULL)
 783     {
 784       gold_assert(layout != NULL);
 785       this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
 786       layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
 787                                       elfcpp::SHF_ALLOC, this->rela_dyn_, true,
 788                                       false, false, false);
 789     }
 790   return this->rela_dyn_;
 791 }
 792
 793 // A class to handle the PLT data.
 794
 795 template<int size, bool big_endian>
 796 class Output_data_plt_powerpc : public Output_section_data
 797 {
 798  public:
 799   typedef Output_data_reloc<elfcpp::SHT_RELA, true,
 800                             size, big_endian> Reloc_section;
 801
 802   Output_data_plt_powerpc(Layout*);
 803
 804   // Add an entry to the PLT.
 805   void add_entry(Symbol* gsym);
 806
 807   // Return the .rela.plt section data.
 808   const Reloc_section* rel_plt() const
 809  {
 810     return this->rel_;
 811   }
 812
 813  protected:
 814   void do_adjust_output_section(Output_section* os);
 815
 816  private:
 817   // The size of an entry in the PLT.
 818   static const int base_plt_entry_size = (size == 32 ? 16 : 24);
 819
 820   // Set the final size.
 821   void
 822   set_final_data_size()
 823   {
 824     unsigned int full_count = this->count_ + 4;
 825
 826     this->set_data_size(full_count * base_plt_entry_size);
 827   }
 828
 829   // Write out the PLT data.
 830   void
 831   do_write(Output_file*);
 832
 833   // The reloc section.
 834   Reloc_section* rel_;
 835   // The number of PLT entries.
 836   unsigned int count_;
 837 };
 838
 839 // Create the PLT section.  The ordinary .got section is an argument,
 840 // since we need to refer to the start.
 841
 842 template<int size, bool big_endian>
 843 Output_data_plt_powerpc<size, big_endian>::Output_data_plt_powerpc(Layout* layout)
 844   : Output_section_data(size == 32 ? 4 : 8), count_(0)
 845 {
 846   this->rel_ = new Reloc_section(false);
 847   layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
 848                                   elfcpp::SHF_ALLOC, this->rel_, true, false,
 849                                   false, false);
 850 }
 851
 852 template<int size, bool big_endian>
 853 void
 854 Output_data_plt_powerpc<size, big_endian>::do_adjust_output_section(Output_section* os)
 855 {
 856   os->set_entsize(0);
 857 }
 858
 859 // Add an entry to the PLT.
 860
 861 template<int size, bool big_endian>
 862 void
 863 Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym)
 864 {
 865   gold_assert(!gsym->has_plt_offset());
 866   unsigned int index = this->count_+ + 4;
 867   section_offset_type plt_offset;
 868
 869   if (index < 8192)
 870     plt_offset = index * base_plt_entry_size;
 871   else
 872     gold_unreachable();
 873
 874   gsym->set_plt_offset(plt_offset);
 875
 876   ++this->count_;
 877
 878   gsym->set_needs_dynsym_entry();
 879   this->rel_->add_global(gsym, elfcpp::R_POWERPC_JMP_SLOT, this,
 880                          plt_offset, 0);
 881 }
 882
 883 static const unsigned int addis_11_11     = 0x3d6b0000;
 884 static const unsigned int addis_11_30     = 0x3d7e0000;
 885 static const unsigned int addis_12_12     = 0x3d8c0000;
 886 static const unsigned int addi_11_11      = 0x396b0000;
 887 static const unsigned int add_0_11_11     = 0x7c0b5a14;
 888 static const unsigned int add_11_0_11     = 0x7d605a14;
 889 static const unsigned int b               = 0x48000000;
 890 static const unsigned int bcl_20_31       = 0x429f0005;
 891 static const unsigned int bctr            = 0x4e800420;
 892 static const unsigned int lis_11          = 0x3d600000;
 893 static const unsigned int lis_12          = 0x3d800000;
 894 static const unsigned int lwzu_0_12       = 0x840c0000;
 895 static const unsigned int lwz_0_12        = 0x800c0000;
 896 static const unsigned int lwz_11_11       = 0x816b0000;
 897 static const unsigned int lwz_11_30       = 0x817e0000;
 898 static const unsigned int lwz_12_12       = 0x818c0000;
 899 static const unsigned int mflr_0          = 0x7c0802a6;
 900 static const unsigned int mflr_12         = 0x7d8802a6;
 901 static const unsigned int mtctr_0         = 0x7c0903a6;
 902 static const unsigned int mtctr_11        = 0x7d6903a6;
 903 static const unsigned int mtlr_0          = 0x7c0803a6;
 904 static const unsigned int nop             = 0x60000000;
 905 static const unsigned int sub_11_11_12    = 0x7d6c5850;
 906
 907 static const unsigned int addis_r12_r2    = 0x3d820000;  /* addis %r12,%r2,xxx@ha     */
 908 static const unsigned int std_r2_40r1     = 0xf8410028;  /* std   %r2,40(%r1)         */
 909 static const unsigned int ld_r11_0r12     = 0xe96c0000;  /* ld    %r11,xxx+0@l(%r12)  */
 910 static const unsigned int ld_r2_0r12      = 0xe84c0000;  /* ld    %r2,xxx+8@l(%r12)   */
 911                                                          /* ld    %r11,xxx+16@l(%r12) */
 912
 913
 914 // Write out the PLT.
 915
 916 template<int size, bool big_endian>
 917 void
 918 Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of)
 919 {
 920   const off_t offset = this->offset();
 921   const section_size_type oview_size =
 922     convert_to_section_size_type(this->data_size());
 923   unsigned char* const oview = of->get_output_view(offset, oview_size);
 924   unsigned char* pov = oview;
 925
 926   memset(pov, 0, base_plt_entry_size * 4);
 927   pov += base_plt_entry_size * 4;
 928
 929   unsigned int plt_offset = base_plt_entry_size * 4;
 930   const unsigned int count = this->count_;
 931
 932   if (size == 64)
 933     {
 934       for (unsigned int i = 0; i < count; i++)
 935         {
 936         }
 937     }
 938   else
 939     {
 940       for (unsigned int i = 0; i < count; i++)
 941         {
 942           elfcpp::Swap<32, true>::writeval(pov + 0x00,
 943                                            lwz_11_30 + plt_offset);
 944           elfcpp::Swap<32, true>::writeval(pov + 0x04, mtctr_11);
 945           elfcpp::Swap<32, true>::writeval(pov + 0x08, bctr);
 946           elfcpp::Swap<32, true>::writeval(pov + 0x0c, nop);
 947           pov += base_plt_entry_size;
 948           plt_offset += base_plt_entry_size;
 949         }
 950     }
 951
 952   gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
 953
 954   of->write_output_view(offset, oview_size, oview);
 955 }
 956
 957 // Create a PLT entry for a global symbol.
 958
 959 template<int size, bool big_endian>
 960 void
 961 Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab,
 962                                                  Layout* layout,
 963                                                  Symbol* gsym)
 964 {
 965   if (gsym->has_plt_offset())
 966     return;
 967
 968   if (this->plt_ == NULL)
 969     {
 970       // Create the GOT section first.
 971       this->got_section(symtab, layout);
 972
 973       // Ensure that .rela.dyn always appears before .rela.plt  This is
 974       // necessary due to how, on PowerPC and some other targets, .rela.dyn
 975       // needs to include .rela.plt in it's range.
 976       this->rela_dyn_section(layout);
 977
 978       this->plt_ = new Output_data_plt_powerpc<size, big_endian>(layout);
 979       layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
 980                                       (elfcpp::SHF_ALLOC
 981                                        | elfcpp::SHF_EXECINSTR
 982                                        | elfcpp::SHF_WRITE),
 983                                       this->plt_, false, false, false, false);
 984
 985       // Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section.
 986       symtab->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL,
 987                                     Symbol_table::PREDEFINED,
 988                                     this->plt_,
 989                                     0, 0, elfcpp::STT_OBJECT,
 990                                     elfcpp::STB_LOCAL,
 991                                     elfcpp::STV_HIDDEN, 0,
 992                                     false, false);
 993     }
 994
 995   this->plt_->add_entry(gsym);
 996 }
 997
 998 // Create a GOT entry for the TLS module index.
 999
1000 template<int size, bool big_endian>
1001 unsigned int
1002 Target_powerpc<size, big_endian>::got_mod_index_entry(Symbol_table* symtab,
1003                                                       Layout* layout,
1004                                                       Sized_relobj<size, big_endian>* object)
1005 {
1006   if (this->got_mod_index_offset_ == -1U)
1007     {
1008       gold_assert(symtab != NULL && layout != NULL && object != NULL);
1009       Reloc_section* rela_dyn = this->rela_dyn_section(layout);
1010       Output_data_got<size, big_endian>* got;
1011       unsigned int got_offset;
1012
1013       got = this->got_section(symtab, layout);
1014       got_offset = got->add_constant(0);
1015       rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got,
1016                           got_offset, 0);
1017       got->add_constant(0);
1018       this->got_mod_index_offset_ = got_offset;
1019     }
1020   return this->got_mod_index_offset_;
1021 }
1022
1023 // Optimize the TLS relocation type based on what we know about the
1024 // symbol.  IS_FINAL is true if the final address of this symbol is
1025 // known at link time.
1026
1027 static tls::Tls_optimization
1028 optimize_tls_reloc(bool /* is_final */, int r_type)
1029 {
1030   // If we are generating a shared library, then we can't do anything
1031   // in the linker.
1032   if (parameters->options().shared())
1033     return tls::TLSOPT_NONE;
1034   switch (r_type)
1035     {
1036       // XXX
1037     default:
1038       gold_unreachable();
1039     }
1040 }
1041
1042 // Report an unsupported relocation against a local symbol.
1043
1044 template<int size, bool big_endian>
1045 void
1046 Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local(
1047                         Sized_relobj<size, big_endian>* object,
1048                         unsigned int r_type)
1049 {
1050   gold_error(_("%s: unsupported reloc %u against local symbol"),
1051              object->name().c_str(), r_type);
1052 }
1053
1054 // We are about to emit a dynamic relocation of type R_TYPE.  If the
1055 // dynamic linker does not support it, issue an error.
1056
1057 template<int size, bool big_endian>
1058 void
1059 Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object,
1060                                                       unsigned int r_type)
1061 {
1062   gold_assert(r_type != elfcpp::R_POWERPC_NONE);
1063
1064   // These are the relocation types supported by glibc for both 32-bit
1065   // and 64-bit powerpc.
1066   switch (r_type)
1067     {
1068     case elfcpp::R_POWERPC_RELATIVE:
1069     case elfcpp::R_POWERPC_GLOB_DAT:
1070     case elfcpp::R_POWERPC_DTPMOD:
1071     case elfcpp::R_POWERPC_DTPREL:
1072     case elfcpp::R_POWERPC_TPREL:
1073     case elfcpp::R_POWERPC_JMP_SLOT:
1074     case elfcpp::R_POWERPC_COPY:
1075     case elfcpp::R_POWERPC_ADDR32:
1076     case elfcpp::R_POWERPC_ADDR24:
1077     case elfcpp::R_POWERPC_REL24:
1078       return;
1079
1080     default:
1081       break;
1082     }
1083
1084   if (size == 64)
1085     {
1086       switch (r_type)
1087         {
1088           // These are the relocation types supported only on 64-bit.
1089         case elfcpp::R_PPC64_ADDR64:
1090         case elfcpp::R_PPC64_TPREL16_LO_DS:
1091         case elfcpp::R_PPC64_TPREL16_DS:
1092         case elfcpp::R_POWERPC_TPREL16:
1093         case elfcpp::R_POWERPC_TPREL16_LO:
1094         case elfcpp::R_POWERPC_TPREL16_HI:
1095         case elfcpp::R_POWERPC_TPREL16_HA:
1096         case elfcpp::R_PPC64_TPREL16_HIGHER:
1097         case elfcpp::R_PPC64_TPREL16_HIGHEST:
1098         case elfcpp::R_PPC64_TPREL16_HIGHERA:
1099         case elfcpp::R_PPC64_TPREL16_HIGHESTA:
1100         case elfcpp::R_PPC64_ADDR16_LO_DS:
1101         case elfcpp::R_POWERPC_ADDR16_LO:
1102         case elfcpp::R_POWERPC_ADDR16_HI:
1103         case elfcpp::R_POWERPC_ADDR16_HA:
1104         case elfcpp::R_POWERPC_ADDR30:
1105         case elfcpp::R_PPC64_UADDR64:
1106         case elfcpp::R_POWERPC_UADDR32:
1107         case elfcpp::R_POWERPC_ADDR16:
1108         case elfcpp::R_POWERPC_UADDR16:
1109         case elfcpp::R_PPC64_ADDR16_DS:
1110         case elfcpp::R_PPC64_ADDR16_HIGHER:
1111         case elfcpp::R_PPC64_ADDR16_HIGHEST:
1112         case elfcpp::R_PPC64_ADDR16_HIGHERA:
1113         case elfcpp::R_PPC64_ADDR16_HIGHESTA:
1114         case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
1115         case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
1116         case elfcpp::R_POWERPC_REL32:
1117         case elfcpp::R_PPC64_REL64:
1118           return;
1119
1120         default:
1121           break;
1122         }
1123     }
1124   else
1125     {
1126       switch (r_type)
1127         {
1128           // These are the relocation types supported only on 32-bit.
1129
1130         default:
1131           break;
1132         }
1133     }
1134
1135   // This prevents us from issuing more than one error per reloc
1136   // section.  But we can still wind up issuing more than one
1137   // error per object file.
1138   if (this->issued_non_pic_error_)
1139     return;
1140   gold_assert(parameters->options().output_is_position_independent());
1141   object->error(_("requires unsupported dynamic reloc; "
1142                   "recompile with -fPIC"));
1143   this->issued_non_pic_error_ = true;
1144   return;
1145 }
1146
1147 // Scan a relocation for a local symbol.
1148
1149 template<int size, bool big_endian>
1150 inline void
1151 Target_powerpc<size, big_endian>::Scan::local(
1152                         Symbol_table* symtab,
1153                         Layout* layout,
1154                         Target_powerpc<size, big_endian>* target,
1155                         Sized_relobj<size, big_endian>* object,
1156                         unsigned int data_shndx,
1157                         Output_section* output_section,
1158                         const elfcpp::Rela<size, big_endian>& reloc,
1159                         unsigned int r_type,
1160                         const elfcpp::Sym<size, big_endian>& lsym)
1161 {
1162   switch (r_type)
1163     {
1164     case elfcpp::R_POWERPC_NONE:
1165     case elfcpp::R_POWERPC_GNU_VTINHERIT:
1166     case elfcpp::R_POWERPC_GNU_VTENTRY:
1167       break;
1168
1169     case elfcpp::R_PPC64_ADDR64:
1170     case elfcpp::R_POWERPC_ADDR32:
1171     case elfcpp::R_POWERPC_ADDR16_HA:
1172     case elfcpp::R_POWERPC_ADDR16_LO:
1173       // If building a shared library (or a position-independent
1174       // executable), we need to create a dynamic relocation for
1175       // this location.
1176       if (parameters->options().output_is_position_independent())
1177         {
1178           Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1179
1180           check_non_pic(object, r_type);
1181           if (lsym.get_st_type() != elfcpp::STT_SECTION)
1182             {
1183               unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1184               rela_dyn->add_local(object, r_sym, r_type, output_section,
1185                                   data_shndx, reloc.get_r_offset(),
1186                                   reloc.get_r_addend());
1187             }
1188           else
1189             {
1190               unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1191               gold_assert(lsym.get_st_value() == 0);
1192               rela_dyn->add_local_relative(object, r_sym, r_type,
1193                                            output_section, data_shndx,
1194                                            reloc.get_r_offset(),
1195                                            reloc.get_r_addend());
1196             }
1197         }
1198       break;
1199
1200     case elfcpp::R_POWERPC_REL24:
1201     case elfcpp::R_PPC_LOCAL24PC:
1202     case elfcpp::R_POWERPC_REL32:
1203     case elfcpp::R_PPC_REL16_LO:
1204     case elfcpp::R_PPC_REL16_HA:
1205       break;
1206
1207     case elfcpp::R_POWERPC_GOT16:
1208     case elfcpp::R_POWERPC_GOT16_LO:
1209     case elfcpp::R_POWERPC_GOT16_HI:
1210     case elfcpp::R_POWERPC_GOT16_HA:
1211     case elfcpp::R_PPC64_TOC16:
1212     case elfcpp::R_PPC64_TOC16_LO:
1213     case elfcpp::R_PPC64_TOC16_HI:
1214     case elfcpp::R_PPC64_TOC16_HA:
1215     case elfcpp::R_PPC64_TOC16_DS:
1216     case elfcpp::R_PPC64_TOC16_LO_DS:
1217       {
1218         // The symbol requires a GOT entry.
1219         Output_data_got<size, big_endian>* got;
1220         unsigned int r_sym;
1221
1222         got = target->got_section(symtab, layout);
1223         r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1224
1225         // If we are generating a shared object, we need to add a
1226         // dynamic relocation for this symbol's GOT entry.
1227         if (parameters->options().output_is_position_independent())
1228           {
1229             if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD))
1230               {
1231                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1232                 unsigned int off;
1233
1234                 off = got->add_constant(0);
1235                 object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off);
1236                 rela_dyn->add_local_relative(object, r_sym,
1237                                              elfcpp::R_POWERPC_RELATIVE,
1238                                              got, off, 0);
1239               }
1240           }
1241         else
1242           got->add_local(object, r_sym, GOT_TYPE_STANDARD);
1243       }
1244       break;
1245
1246     case elfcpp::R_PPC64_TOC:
1247       // We need a GOT section.
1248       target->got_section(symtab, layout);
1249       break;
1250
1251       // These are relocations which should only be seen by the
1252       // dynamic linker, and should never be seen here.
1253     case elfcpp::R_POWERPC_COPY:
1254     case elfcpp::R_POWERPC_GLOB_DAT:
1255     case elfcpp::R_POWERPC_JMP_SLOT:
1256     case elfcpp::R_POWERPC_RELATIVE:
1257     case elfcpp::R_POWERPC_DTPMOD:
1258       gold_error(_("%s: unexpected reloc %u in object file"),
1259                  object->name().c_str(), r_type);
1260       break;
1261
1262     default:
1263       unsupported_reloc_local(object, r_type);
1264       break;
1265     }
1266 }
1267
1268 // Report an unsupported relocation against a global symbol.
1269
1270 template<int size, bool big_endian>
1271 void
1272 Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global(
1273                         Sized_relobj<size, big_endian>* object,
1274                         unsigned int r_type,
1275                         Symbol* gsym)
1276 {
1277   gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1278              object->name().c_str(), r_type, gsym->demangled_name().c_str());
1279 }
1280
1281 // Scan a relocation for a global symbol.
1282
1283 template<int size, bool big_endian>
1284 inline void
1285 Target_powerpc<size, big_endian>::Scan::global(
1286                                 Symbol_table* symtab,
1287                                 Layout* layout,
1288                                 Target_powerpc<size, big_endian>* target,
1289                                 Sized_relobj<size, big_endian>* object,
1290                                 unsigned int data_shndx,
1291                                 Output_section* output_section,
1292                                 const elfcpp::Rela<size, big_endian>& reloc,
1293                                 unsigned int r_type,
1294                                 Symbol* gsym)
1295 {
1296   switch (r_type)
1297     {
1298     case elfcpp::R_POWERPC_NONE:
1299     case elfcpp::R_POWERPC_GNU_VTINHERIT:
1300     case elfcpp::R_POWERPC_GNU_VTENTRY:
1301       break;
1302
1303     case elfcpp::R_PPC_PLTREL24:
1304       // If the symbol is fully resolved, this is just a PC32 reloc.
1305       // Otherwise we need a PLT entry.
1306       if (gsym->final_value_is_known())
1307         break;
1308       // If building a shared library, we can also skip the PLT entry
1309       // if the symbol is defined in the output file and is protected
1310       // or hidden.
1311       if (gsym->is_defined()
1312           && !gsym->is_from_dynobj()
1313           && !gsym->is_preemptible())
1314         break;
1315       target->make_plt_entry(symtab, layout, gsym);
1316       break;
1317
1318     case elfcpp::R_POWERPC_ADDR16:
1319     case elfcpp::R_POWERPC_ADDR16_LO:
1320     case elfcpp::R_POWERPC_ADDR16_HI:
1321     case elfcpp::R_POWERPC_ADDR16_HA:
1322     case elfcpp::R_POWERPC_ADDR32:
1323     case elfcpp::R_PPC64_ADDR64:
1324       {
1325         // Make a PLT entry if necessary.
1326         if (gsym->needs_plt_entry())
1327           {
1328             target->make_plt_entry(symtab, layout, gsym);
1329             // Since this is not a PC-relative relocation, we may be
1330             // taking the address of a function. In that case we need to
1331             // set the entry in the dynamic symbol table to the address of
1332             // the PLT entry.
1333             if (gsym->is_from_dynobj() && !parameters->options().shared())
1334               gsym->set_needs_dynsym_value();
1335           }
1336         // Make a dynamic relocation if necessary.
1337         if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF))
1338           {
1339             if (gsym->may_need_copy_reloc())
1340               {
1341                 target->copy_reloc(symtab, layout, object,
1342                                    data_shndx, output_section, gsym, reloc);
1343               }
1344             else if ((r_type == elfcpp::R_POWERPC_ADDR32
1345                       || r_type == elfcpp::R_PPC64_ADDR64)
1346                      && gsym->can_use_relative_reloc(false))
1347               {
1348                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1349                 rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
1350                                               output_section, object,
1351                                               data_shndx, reloc.get_r_offset(),
1352                                               reloc.get_r_addend());
1353               }
1354             else
1355               {
1356                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1357
1358                 check_non_pic(object, r_type);
1359                 if (gsym->is_from_dynobj()
1360                     || gsym->is_undefined()
1361                     || gsym->is_preemptible())
1362                   rela_dyn->add_global(gsym, r_type, output_section,
1363                                        object, data_shndx,
1364                                        reloc.get_r_offset(),
1365                                        reloc.get_r_addend());
1366                 else
1367                   rela_dyn->add_global_relative(gsym, r_type,
1368                                                 output_section, object,
1369                                                 data_shndx,
1370                                                 reloc.get_r_offset(),
1371                                                 reloc.get_r_addend());
1372               }
1373           }
1374       }
1375       break;
1376
1377     case elfcpp::R_POWERPC_REL24:
1378     case elfcpp::R_PPC_LOCAL24PC:
1379     case elfcpp::R_PPC_REL16:
1380     case elfcpp::R_PPC_REL16_LO:
1381     case elfcpp::R_PPC_REL16_HI:
1382     case elfcpp::R_PPC_REL16_HA:
1383       {
1384         if (gsym->needs_plt_entry())
1385           target->make_plt_entry(symtab, layout, gsym);
1386         // Make a dynamic relocation if necessary.
1387         int flags = Symbol::NON_PIC_REF;
1388         if (gsym->type() == elfcpp::STT_FUNC)
1389           flags |= Symbol::FUNCTION_CALL;
1390         if (gsym->needs_dynamic_reloc(flags))
1391           {
1392             if (gsym->may_need_copy_reloc())
1393               {
1394                 target->copy_reloc(symtab, layout, object,
1395                                    data_shndx, output_section, gsym,
1396                                    reloc);
1397               }
1398             else
1399               {
1400                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1401                 check_non_pic(object, r_type);
1402                 rela_dyn->add_global(gsym, r_type, output_section, object,
1403                                      data_shndx, reloc.get_r_offset(),
1404                                      reloc.get_r_addend());
1405               }
1406           }
1407       }
1408       break;
1409
1410     case elfcpp::R_POWERPC_GOT16:
1411     case elfcpp::R_POWERPC_GOT16_LO:
1412     case elfcpp::R_POWERPC_GOT16_HI:
1413     case elfcpp::R_POWERPC_GOT16_HA:
1414     case elfcpp::R_PPC64_TOC16:
1415     case elfcpp::R_PPC64_TOC16_LO:
1416     case elfcpp::R_PPC64_TOC16_HI:
1417     case elfcpp::R_PPC64_TOC16_HA:
1418     case elfcpp::R_PPC64_TOC16_DS:
1419     case elfcpp::R_PPC64_TOC16_LO_DS:
1420       {
1421         // The symbol requires a GOT entry.
1422         Output_data_got<size, big_endian>* got;
1423
1424         got = target->got_section(symtab, layout);
1425         if (gsym->final_value_is_known())
1426           got->add_global(gsym, GOT_TYPE_STANDARD);
1427         else
1428           {
1429             // If this symbol is not fully resolved, we need to add a
1430             // dynamic relocation for it.
1431             Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1432             if (gsym->is_from_dynobj()
1433                 || gsym->is_undefined()
1434                 || gsym->is_preemptible())
1435               got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn,
1436                                         elfcpp::R_POWERPC_GLOB_DAT);
1437             else if (!gsym->has_got_offset(GOT_TYPE_STANDARD))
1438               {
1439                 unsigned int off = got->add_constant(0);
1440
1441                 gsym->set_got_offset(GOT_TYPE_STANDARD, off);
1442                 rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
1443                                               got, off, 0);
1444               }
1445           }
1446       }
1447       break;
1448
1449     case elfcpp::R_PPC64_TOC:
1450       // We need a GOT section.
1451       target->got_section(symtab, layout);
1452       break;
1453
1454     case elfcpp::R_POWERPC_GOT_TPREL16:
1455     case elfcpp::R_POWERPC_TLS:
1456       // XXX TLS
1457       break;
1458
1459       // These are relocations which should only be seen by the
1460       // dynamic linker, and should never be seen here.
1461     case elfcpp::R_POWERPC_COPY:
1462     case elfcpp::R_POWERPC_GLOB_DAT:
1463     case elfcpp::R_POWERPC_JMP_SLOT:
1464     case elfcpp::R_POWERPC_RELATIVE:
1465     case elfcpp::R_POWERPC_DTPMOD:
1466       gold_error(_("%s: unexpected reloc %u in object file"),
1467                  object->name().c_str(), r_type);
1468       break;
1469
1470     default:
1471       unsupported_reloc_global(object, r_type, gsym);
1472       break;
1473     }
1474 }
1475
1476 // Process relocations for gc.
1477
1478 template<int size, bool big_endian>
1479 void
1480 Target_powerpc<size, big_endian>::gc_process_relocs(
1481                         Symbol_table* symtab,
1482                         Layout* layout,
1483                         Sized_relobj<size, big_endian>* object,
1484                         unsigned int data_shndx,
1485                         unsigned int,
1486                         const unsigned char* prelocs,
1487                         size_t reloc_count,
1488                         Output_section* output_section,
1489                         bool needs_special_offset_handling,
1490                         size_t local_symbol_count,
1491                         const unsigned char* plocal_symbols)
1492 {
1493   typedef Target_powerpc<size, big_endian> Powerpc;
1494   typedef typename Target_powerpc<size, big_endian>::Scan Scan;
1495
1496   gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan,
1497                           typename Target_powerpc::Relocatable_size_for_reloc>(
1498     symtab,
1499     layout,
1500     this,
1501     object,
1502     data_shndx,
1503     prelocs,
1504     reloc_count,
1505     output_section,
1506     needs_special_offset_handling,
1507     local_symbol_count,
1508     plocal_symbols);
1509 }
1510
1511 // Scan relocations for a section.
1512
1513 template<int size, bool big_endian>
1514 void
1515 Target_powerpc<size, big_endian>::scan_relocs(
1516                         Symbol_table* symtab,
1517                         Layout* layout,
1518                         Sized_relobj<size, big_endian>* object,
1519                         unsigned int data_shndx,
1520                         unsigned int sh_type,
1521                         const unsigned char* prelocs,
1522                         size_t reloc_count,
1523                         Output_section* output_section,
1524                         bool needs_special_offset_handling,
1525                         size_t local_symbol_count,
1526                         const unsigned char* plocal_symbols)
1527 {
1528   typedef Target_powerpc<size, big_endian> Powerpc;
1529   typedef typename Target_powerpc<size, big_endian>::Scan Scan;
1530   static Output_data_space* sdata;
1531
1532   if (sh_type == elfcpp::SHT_REL)
1533     {
1534       gold_error(_("%s: unsupported REL reloc section"),
1535                  object->name().c_str());
1536       return;
1537     }
1538
1539   // Define _SDA_BASE_ at the start of the .sdata section.
1540   if (sdata == NULL)
1541   {
1542     // layout->find_output_section(".sdata") == NULL
1543     sdata = new Output_data_space(4, "** sdata");
1544     Output_section* os = layout->add_output_section_data(".sdata", 0,
1545                                                          elfcpp::SHF_ALLOC
1546                                                          | elfcpp::SHF_WRITE,
1547                                                          sdata, false,
1548                                                          false, false, false);
1549     symtab->define_in_output_data("_SDA_BASE_", NULL,
1550                                   Symbol_table::PREDEFINED,
1551                                   os,
1552                                   32768, 0,
1553                                   elfcpp::STT_OBJECT,
1554                                   elfcpp::STB_LOCAL,
1555                                   elfcpp::STV_HIDDEN, 0,
1556                                   false, false);
1557   }
1558
1559   gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
1560     symtab,
1561     layout,
1562     this,
1563     object,
1564     data_shndx,
1565     prelocs,
1566     reloc_count,
1567     output_section,
1568     needs_special_offset_handling,
1569     local_symbol_count,
1570     plocal_symbols);
1571 }
1572
1573 // Finalize the sections.
1574
1575 template<int size, bool big_endian>
1576 void
1577 Target_powerpc<size, big_endian>::do_finalize_sections(
1578     Layout* layout,
1579     const Input_objects*,
1580     Symbol_table*)
1581 {
1582   // Fill in some more dynamic tags.
1583   const Reloc_section* rel_plt = (this->plt_ == NULL
1584                                   ? NULL
1585                                   : this->plt_->rel_plt());
1586   layout->add_target_dynamic_tags(false, this->plt_, rel_plt,
1587                                   this->rela_dyn_, true, size == 32);
1588
1589   // Emit any relocs we saved in an attempt to avoid generating COPY
1590   // relocs.
1591   if (this->copy_relocs_.any_saved_relocs())
1592     this->copy_relocs_.emit(this->rela_dyn_section(layout));
1593 }
1594
1595 // Perform a relocation.
1596
1597 template<int size, bool big_endian>
1598 inline bool
1599 Target_powerpc<size, big_endian>::Relocate::relocate(
1600                         const Relocate_info<size, big_endian>* relinfo,
1601                         Target_powerpc* target,
1602                         Output_section*,
1603                         size_t relnum,
1604                         const elfcpp::Rela<size, big_endian>& rela,
1605                         unsigned int r_type,
1606                         const Sized_symbol<size>* gsym,
1607                         const Symbol_value<size>* psymval,
1608                         unsigned char* view,
1609                         typename elfcpp::Elf_types<size>::Elf_Addr address,
1610                         section_size_type /* view_size */)
1611 {
1612   const unsigned int toc_base_offset = 0x8000;
1613   typedef Powerpc_relocate_functions<size, big_endian> Reloc;
1614
1615   // Pick the value to use for symbols defined in shared objects.
1616   Symbol_value<size> symval;
1617   if (gsym != NULL
1618       && gsym->use_plt_offset(r_type == elfcpp::R_POWERPC_REL24
1619                               || r_type == elfcpp::R_PPC_LOCAL24PC
1620                               || r_type == elfcpp::R_PPC_REL16
1621                               || r_type == elfcpp::R_PPC_REL16_LO
1622                               || r_type == elfcpp::R_PPC_REL16_HI
1623                               || r_type == elfcpp::R_PPC_REL16_HA))
1624     {
1625       elfcpp::Elf_Xword value;
1626
1627       value = target->plt_section()->address() + gsym->plt_offset();
1628
1629       symval.set_output_value(value);
1630
1631       psymval = &symval;
1632     }
1633
1634   const Sized_relobj<size, big_endian>* object = relinfo->object;
1635   elfcpp::Elf_Xword addend = rela.get_r_addend();
1636
1637   // Get the GOT offset if needed.  Unlike i386 and x86_64, our GOT
1638   // pointer points to the beginning, not the end, of the table.
1639   // So we just use the plain offset.
1640   unsigned int got_offset = 0;
1641   unsigned int got2_offset = 0;
1642   switch (r_type)
1643     {
1644     case elfcpp::R_PPC64_TOC16:
1645     case elfcpp::R_PPC64_TOC16_LO:
1646     case elfcpp::R_PPC64_TOC16_HI:
1647     case elfcpp::R_PPC64_TOC16_HA:
1648     case elfcpp::R_PPC64_TOC16_DS:
1649     case elfcpp::R_PPC64_TOC16_LO_DS:
1650         // Subtract the TOC base address.
1651         addend -= target->toc_section()->address() + toc_base_offset;
1652         /* FALLTHRU */
1653
1654     case elfcpp::R_POWERPC_GOT16:
1655     case elfcpp::R_POWERPC_GOT16_LO:
1656     case elfcpp::R_POWERPC_GOT16_HI:
1657     case elfcpp::R_POWERPC_GOT16_HA:
1658     case elfcpp::R_PPC64_GOT16_DS:
1659     case elfcpp::R_PPC64_GOT16_LO_DS:
1660       if (gsym != NULL)
1661         {
1662           gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
1663           got_offset = gsym->got_offset(GOT_TYPE_STANDARD);
1664         }
1665       else
1666         {
1667           unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
1668           gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
1669           got_offset = object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
1670         }
1671       break;
1672
1673       // R_PPC_PLTREL24 is rather special.  If non-zero,
1674       // the addend specifies the GOT pointer offset within .got2.
1675     case elfcpp::R_PPC_PLTREL24:
1676       if (addend >= 32768)
1677         {
1678           Output_data_space* got2;
1679           got2 = target->got2_section();
1680           got2_offset = got2->offset();
1681           addend += got2_offset;
1682         }
1683       break;
1684
1685     default:
1686       break;
1687     }
1688
1689   switch (r_type)
1690     {
1691     case elfcpp::R_POWERPC_NONE:
1692     case elfcpp::R_POWERPC_GNU_VTINHERIT:
1693     case elfcpp::R_POWERPC_GNU_VTENTRY:
1694       break;
1695
1696     case elfcpp::R_POWERPC_REL32:
1697       Reloc::rel32(view, object, psymval, addend, address);
1698       break;
1699
1700     case elfcpp::R_POWERPC_REL24:
1701       Reloc::rel24(view, object, psymval, addend, address);
1702       break;
1703
1704     case elfcpp::R_POWERPC_REL14:
1705       Reloc::rel14(view, object, psymval, addend, address);
1706       break;
1707
1708     case elfcpp::R_PPC_PLTREL24:
1709       Reloc::rel24(view, object, psymval, addend, address);
1710       break;
1711
1712     case elfcpp::R_PPC_LOCAL24PC:
1713       Reloc::rel24(view, object, psymval, addend, address);
1714       break;
1715
1716     case elfcpp::R_PPC64_ADDR64:
1717       if (!parameters->options().output_is_position_independent())
1718         Relocate_functions<size, big_endian>::rela64(view, object,
1719                                                      psymval, addend);
1720       break;
1721
1722     case elfcpp::R_POWERPC_ADDR32:
1723       if (!parameters->options().output_is_position_independent())
1724         Relocate_functions<size, big_endian>::rela32(view, object,
1725                                                      psymval, addend);
1726       break;
1727
1728     case elfcpp::R_POWERPC_ADDR16_LO:
1729       Reloc::addr16_lo(view, object, psymval, addend);
1730       break;
1731
1732     case elfcpp::R_POWERPC_ADDR16_HI:
1733       Reloc::addr16_hi(view, object, psymval, addend);
1734       break;
1735
1736     case elfcpp::R_POWERPC_ADDR16_HA:
1737       Reloc::addr16_ha(view, object, psymval, addend);
1738       break;
1739
1740     case elfcpp::R_PPC_REL16_LO:
1741       Reloc::rel16_lo(view, object, psymval, addend, address);
1742       break;
1743
1744     case elfcpp::R_PPC_REL16_HI:
1745       Reloc::rel16_lo(view, object, psymval, addend, address);
1746       break;
1747
1748     case elfcpp::R_PPC_REL16_HA:
1749       Reloc::rel16_ha(view, object, psymval, addend, address);
1750       break;
1751
1752     case elfcpp::R_POWERPC_GOT16:
1753       Reloc::addr16(view, got_offset, addend);
1754       break;
1755
1756     case elfcpp::R_POWERPC_GOT16_LO:
1757       Reloc::addr16_lo(view, got_offset, addend);
1758       break;
1759
1760     case elfcpp::R_POWERPC_GOT16_HI:
1761       Reloc::addr16_hi(view, got_offset, addend);
1762       break;
1763
1764     case elfcpp::R_POWERPC_GOT16_HA:
1765       Reloc::addr16_ha(view, got_offset, addend);
1766       break;
1767
1768     case elfcpp::R_PPC64_TOC16:
1769       Reloc::addr16(view, got_offset, addend);
1770       break;
1771
1772     case elfcpp::R_PPC64_TOC16_LO:
1773       Reloc::addr16_lo(view, got_offset, addend);
1774       break;
1775
1776     case elfcpp::R_PPC64_TOC16_HI:
1777       Reloc::addr16_hi(view, got_offset, addend);
1778       break;
1779
1780     case elfcpp::R_PPC64_TOC16_HA:
1781       Reloc::addr16_ha(view, got_offset, addend);
1782       break;
1783
1784     case elfcpp::R_PPC64_TOC16_DS:
1785     case elfcpp::R_PPC64_TOC16_LO_DS:
1786       Reloc::addr16_ds(view, got_offset, addend);
1787       break;
1788
1789     case elfcpp::R_PPC64_TOC:
1790       {
1791         elfcpp::Elf_types<64>::Elf_Addr value;
1792         value = target->toc_section()->address() + toc_base_offset;
1793         Relocate_functions<64, false>::rela64(view, value, addend);
1794       }
1795       break;
1796
1797     case elfcpp::R_POWERPC_COPY:
1798     case elfcpp::R_POWERPC_GLOB_DAT:
1799     case elfcpp::R_POWERPC_JMP_SLOT:
1800     case elfcpp::R_POWERPC_RELATIVE:
1801       // This is an outstanding tls reloc, which is unexpected when
1802       // linking.
1803     case elfcpp::R_POWERPC_DTPMOD:
1804       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1805                              _("unexpected reloc %u in object file"),
1806                              r_type);
1807       break;
1808
1809     default:
1810       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1811                              _("unsupported reloc %u"),
1812                              r_type);
1813       break;
1814     }
1815
1816   return true;
1817 }
1818
1819 // Perform a TLS relocation.
1820
1821 template<int size, bool big_endian>
1822 inline void
1823 Target_powerpc<size, big_endian>::Relocate::relocate_tls(
1824                         const Relocate_info<size, big_endian>* relinfo,
1825                         Target_powerpc<size, big_endian>* target,
1826                         size_t relnum,
1827                         const elfcpp::Rela<size, big_endian>& rela,
1828                         unsigned int r_type,
1829                         const Sized_symbol<size>* gsym,
1830                         const Symbol_value<size>* psymval,
1831                         unsigned char* view,
1832                         typename elfcpp::Elf_types<size>::Elf_Addr address,
1833                         section_size_type)
1834 {
1835   Output_segment* tls_segment = relinfo->layout->tls_segment();
1836   typedef Powerpc_relocate_functions<size, big_endian> Reloc;
1837   const Sized_relobj<size, big_endian>* object = relinfo->object;
1838
1839   const elfcpp::Elf_Xword addend = rela.get_r_addend();
1840   typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(object, 0);
1841
1842   const bool is_final =
1843     (gsym == NULL
1844      ? !parameters->options().output_is_position_independent()
1845      : gsym->final_value_is_known());
1846   const tls::Tls_optimization optimized_type
1847       = optimize_tls_reloc(is_final, r_type);
1848
1849   switch (r_type)
1850     {
1851       // XXX
1852     }
1853 }
1854
1855 // Relocate section data.
1856
1857 template<int size, bool big_endian>
1858 void
1859 Target_powerpc<size, big_endian>::relocate_section(
1860                         const Relocate_info<size, big_endian>* relinfo,
1861                         unsigned int sh_type,
1862                         const unsigned char* prelocs,
1863                         size_t reloc_count,
1864                         Output_section* output_section,
1865                         bool needs_special_offset_handling,
1866                         unsigned char* view,
1867                         typename elfcpp::Elf_types<size>::Elf_Addr address,
1868                         section_size_type view_size,
1869                         const Reloc_symbol_changes* reloc_symbol_changes)
1870 {
1871   typedef Target_powerpc<size, big_endian> Powerpc;
1872   typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate;
1873
1874   gold_assert(sh_type == elfcpp::SHT_RELA);
1875
1876   gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA,
1877     Powerpc_relocate>(
1878     relinfo,
1879     this,
1880     prelocs,
1881     reloc_count,
1882     output_section,
1883     needs_special_offset_handling,
1884     view,
1885     address,
1886     view_size,
1887     reloc_symbol_changes);
1888 }
1889
1890 // Return the size of a relocation while scanning during a relocatable
1891 // link.
1892
1893 template<int size, bool big_endian>
1894 unsigned int
1895 Target_powerpc<size, big_endian>::Relocatable_size_for_reloc::get_size_for_reloc(
1896     unsigned int,
1897     Relobj*)
1898 {
1899   // We are always SHT_RELA, so we should never get here.
1900   gold_unreachable();
1901   return 0;
1902 }
1903
1904 // Scan the relocs during a relocatable link.
1905
1906 template<int size, bool big_endian>
1907 void
1908 Target_powerpc<size, big_endian>::scan_relocatable_relocs(
1909                         Symbol_table* symtab,
1910                         Layout* layout,
1911                         Sized_relobj<size, big_endian>* object,
1912                         unsigned int data_shndx,
1913                         unsigned int sh_type,
1914                         const unsigned char* prelocs,
1915                         size_t reloc_count,
1916                         Output_section* output_section,
1917                         bool needs_special_offset_handling,
1918                         size_t local_symbol_count,
1919                         const unsigned char* plocal_symbols,
1920                         Relocatable_relocs* rr)
1921 {
1922   gold_assert(sh_type == elfcpp::SHT_RELA);
1923
1924   typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA,
1925     Relocatable_size_for_reloc> Scan_relocatable_relocs;
1926
1927   gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA,
1928       Scan_relocatable_relocs>(
1929     symtab,
1930     layout,
1931     object,
1932     data_shndx,
1933     prelocs,
1934     reloc_count,
1935     output_section,
1936     needs_special_offset_handling,
1937     local_symbol_count,
1938     plocal_symbols,
1939     rr);
1940 }
1941
1942 // Relocate a section during a relocatable link.
1943
1944 template<int size, bool big_endian>
1945 void
1946 Target_powerpc<size, big_endian>::relocate_for_relocatable(
1947     const Relocate_info<size, big_endian>* relinfo,
1948     unsigned int sh_type,
1949     const unsigned char* prelocs,
1950     size_t reloc_count,
1951     Output_section* output_section,
1952     off_t offset_in_output_section,
1953     const Relocatable_relocs* rr,
1954     unsigned char* view,
1955     typename elfcpp::Elf_types<size>::Elf_Addr view_address,
1956     section_size_type view_size,
1957     unsigned char* reloc_view,
1958     section_size_type reloc_view_size)
1959 {
1960   gold_assert(sh_type == elfcpp::SHT_RELA);
1961
1962   gold::relocate_for_relocatable<size, big_endian, elfcpp::SHT_RELA>(
1963     relinfo,
1964     prelocs,
1965     reloc_count,
1966     output_section,
1967     offset_in_output_section,
1968     rr,
1969     view,
1970     view_address,
1971     view_size,
1972     reloc_view,
1973     reloc_view_size);
1974 }
1975
1976 // Return the value to use for a dynamic which requires special
1977 // treatment.  This is how we support equality comparisons of function
1978 // pointers across shared library boundaries, as described in the
1979 // processor specific ABI supplement.
1980
1981 template<int size, bool big_endian>
1982 uint64_t
1983 Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
1984 {
1985   gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
1986   return this->plt_section()->address() + gsym->plt_offset();
1987 }
1988
1989 // The selector for powerpc object files.
1990
1991 template<int size, bool big_endian>
1992 class Target_selector_powerpc : public Target_selector
1993 {
1994 public:
1995   Target_selector_powerpc()
1996     : Target_selector(elfcpp::EM_NONE, size, big_endian,
1997                       (size == 64 ?
1998                        (big_endian ? "elf64-powerpc" : "elf64-powerpcle") :
1999                        (big_endian ? "elf32-powerpc" : "elf32-powerpcle")))
2000   { }
2001
2002   Target* do_recognize(int machine, int, int)
2003   {
2004     switch (size)
2005       {
2006       case 64:
2007         if (machine != elfcpp::EM_PPC64)
2008           return NULL;
2009         break;
2010
2011       case 32:
2012         if (machine != elfcpp::EM_PPC)
2013           return NULL;
2014         break;
2015
2016       default:
2017         return NULL;
2018       }
2019
2020     return this->instantiate_target();
2021   }
2022
2023   Target* do_instantiate_target()
2024   { return new Target_powerpc<size, big_endian>(); }
2025 };
2026
2027 Target_selector_powerpc<32, true> target_selector_ppc32;
2028 Target_selector_powerpc<32, false> target_selector_ppc32le;
2029 Target_selector_powerpc<64, true> target_selector_ppc64;
2030 Target_selector_powerpc<64, false> target_selector_ppc64le;
2031
2032 } // End anonymous namespace.