* target.h (Target::gc_mark_symbol, do_gc_mark_symbol): New functions.

[binutils-gdb.git] / gold / powerpc.cc

// powerpc.cc -- powerpc target support for gold.

// Copyright 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
// Written by David S. Miller <davem@davemloft.net>
//        and David Edelsohn <edelsohn@gnu.org>

// This file is part of gold.

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.

#include "gold.h"

#include "elfcpp.h"
#include "parameters.h"
#include "reloc.h"
#include "powerpc.h"
#include "object.h"
#include "symtab.h"
#include "layout.h"
#include "output.h"
#include "copy-relocs.h"
#include "target.h"
#include "target-reloc.h"
#include "target-select.h"
#include "tls.h"
#include "errors.h"
#include "gc.h"

namespace
{

using namespace gold;

template<int size, bool big_endian>
class Output_data_plt_powerpc;

template<int size, bool big_endian>
class Output_data_got_powerpc;

template<int size, bool big_endian>
class Output_data_glink;

template<int size, bool big_endian>
class Powerpc_relobj : public Sized_relobj_file<size, big_endian>
{
public:
  typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
  typedef typename elfcpp::Elf_types<size>::Elf_Off Offset;
  typedef Unordered_set<Section_id, Section_id_hash> Section_refs;
  typedef Unordered_map<Address, Section_refs> Access_from;

  Powerpc_relobj(const std::string& name, Input_file* input_file, off_t offset,
                 const typename elfcpp::Ehdr<size, big_endian>& ehdr)
    : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr),
      special_(0), opd_ent_shndx_(), opd_ent_off_(), access_from_map_(),
      opd_valid_(false)
  { }

  ~Powerpc_relobj()
  { }

  // The .got2 section shndx.
  unsigned int
  got2_shndx() const
  {
    if (size == 32)
      return this->special_;
    else
      return 0;
  }

  // The .opd section shndx.
  unsigned int
  opd_shndx() const
  {
    if (size == 32)
      return 0;
    else
      return this->special_;
  }

  // Init OPD entry arrays.
  void
  init_opd(size_t opd_size)
  {
    size_t count = this->opd_ent_ndx(opd_size);
    this->opd_ent_shndx_.resize(count);
    this->opd_ent_off_.reserve(count);
  }

  // Return section and offset of function entry for .opd + R_OFF.
  unsigned int
  get_opd_ent(Address r_off, Address* value = NULL) const
  {
    size_t ndx = this->opd_ent_ndx(r_off);
    gold_assert(ndx < this->opd_ent_shndx_.size());
    gold_assert(this->opd_ent_shndx_[ndx] != 0);
    if (value != NULL)
      *value = this->opd_ent_off_[ndx];
    return this->opd_ent_shndx_[ndx];
  }

  // Set section and offset of function entry for .opd + R_OFF.
  void
  set_opd_ent(Address r_off, unsigned int shndx, Address value)
  {
    size_t ndx = this->opd_ent_ndx(r_off);
    gold_assert(ndx < this->opd_ent_shndx_.size());
    this->opd_ent_shndx_[ndx] = shndx;
    this->opd_ent_off_[ndx] = value;
  }

  Access_from*
  access_from_map()
  { return &this->access_from_map_; }

  // Add a reference from SRC_OBJ, SRC_INDX to this object's .opd
  // section at DST_OFF.
  void
  add_reference(Object* src_obj,
                unsigned int src_indx,
                typename elfcpp::Elf_types<size>::Elf_Addr dst_off)
  {
    Section_id src_id(src_obj, src_indx);
    this->access_from_map_[dst_off].insert(src_id);
  }

  bool
  opd_valid() const
  { return this->opd_valid_; }

  void
  set_opd_valid()
  { this->opd_valid_ = true; }

  // Examine .rela.opd to build info about function entry points.
  void
  scan_opd_relocs(size_t reloc_count,
                  const unsigned char* prelocs,
                  const unsigned char* plocal_syms);

  void
  do_read_relocs(Read_relocs_data*);

  bool
  do_find_special_sections(Read_symbols_data* sd);

  // Return offset in output GOT section that this object will use
  // as a TOC pointer.  Won't be just a constant with multi-toc support.
  Address
  toc_base_offset() const
  { return 0x8000; }

private:
  // Return index into opd_ent_shndx or opd_ent_off array for .opd entry
  // at OFF.  .opd entries are 24 bytes long, but they can be spaced
  // 16 bytes apart when the language doesn't use the last 8-byte
  // word, the environment pointer.  Thus dividing the entry section
  // offset by 16 will give an index into opd_ent_shndx_ and
  // opd_ent_off_ that works for either layout of .opd.  (It leaves
  // some elements of the vectors unused when .opd entries are spaced
  // 24 bytes apart, but we don't know the spacing until relocations
  // are processed, and in any case it is possible for an object to
  // have some entries spaced 16 bytes apart and others 24 bytes apart.)
  size_t
  opd_ent_ndx(size_t off) const
  { return off >> 4;}

  // For 32-bit the .got2 section shdnx, for 64-bit the .opd section shndx.
  unsigned int special_;
  // The first 8-byte word of an OPD entry gives the address of the
  // entry point of the function.  Relocatable object files have a
  // relocation on this word.  The following two vectors record the
  // section and offset specified by these relocations.
  std::vector<unsigned int> opd_ent_shndx_;
  std::vector<Offset> opd_ent_off_;
  // References made to this object's .opd section when running
  // gc_process_relocs for another object, before the opd_ent vectors
  // are valid for this object.
  Access_from access_from_map_;
  // Set at the start of gc_process_relocs, when we know opd_ent
  // vectors are valid.  The flag could be made atomic and set in
  // do_read_relocs with memory_order_release and then tested with
  // memory_order_acquire, potentially resulting in fewer entries in
  // access_from_map_.
  bool opd_valid_;
};

template<int size, bool big_endian>
class Target_powerpc : public Sized_target<size, big_endian>
{
 public:
  typedef
    Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section;
  typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
  typedef typename elfcpp::Elf_types<size>::Elf_Swxword Signed_address;
  static const Address invalid_address = static_cast<Address>(0) - 1;
  // Offset of tp and dtp pointers from start of TLS block.
  static const Address tp_offset = 0x7000;
  static const Address dtp_offset = 0x8000;

  Target_powerpc()
    : Sized_target<size, big_endian>(&powerpc_info),
      got_(NULL), plt_(NULL), glink_(NULL), rela_dyn_(NULL),
      copy_relocs_(elfcpp::R_POWERPC_COPY),
      dynbss_(NULL), tlsld_got_offset_(-1U)
  {
  }

  // Process the relocations to determine unreferenced sections for
  // garbage collection.
  void
  gc_process_relocs(Symbol_table* symtab,
                    Layout* layout,
                    Sized_relobj_file<size, big_endian>* object,
                    unsigned int data_shndx,
                    unsigned int sh_type,
                    const unsigned char* prelocs,
                    size_t reloc_count,
                    Output_section* output_section,
                    bool needs_special_offset_handling,
                    size_t local_symbol_count,
                    const unsigned char* plocal_symbols);

  // Scan the relocations to look for symbol adjustments.
  void
  scan_relocs(Symbol_table* symtab,
              Layout* layout,
              Sized_relobj_file<size, big_endian>* object,
              unsigned int data_shndx,
              unsigned int sh_type,
              const unsigned char* prelocs,
              size_t reloc_count,
              Output_section* output_section,
              bool needs_special_offset_handling,
              size_t local_symbol_count,
              const unsigned char* plocal_symbols);

  // Map input .toc section to output .got section.
  const char*
  do_output_section_name(const Relobj*, const char* name, size_t* plen) const
  {
    if (size == 64 && strcmp(name, ".toc") == 0)
      {
        *plen = 4;
        return ".got";
      }
    return NULL;
  }

  // Finalize the sections.
  void
  do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);

  // Return the value to use for a dynamic which requires special
  // treatment.
  uint64_t
  do_dynsym_value(const Symbol*) const;

  // Relocate a section.
  void
  relocate_section(const Relocate_info<size, big_endian>*,
                   unsigned int sh_type,
                   const unsigned char* prelocs,
                   size_t reloc_count,
                   Output_section* output_section,
                   bool needs_special_offset_handling,
                   unsigned char* view,
                   Address view_address,
                   section_size_type view_size,
                   const Reloc_symbol_changes*);

  // Scan the relocs during a relocatable link.
  void
  scan_relocatable_relocs(Symbol_table* symtab,
                          Layout* layout,
                          Sized_relobj_file<size, big_endian>* object,
                          unsigned int data_shndx,
                          unsigned int sh_type,
                          const unsigned char* prelocs,
                          size_t reloc_count,
                          Output_section* output_section,
                          bool needs_special_offset_handling,
                          size_t local_symbol_count,
                          const unsigned char* plocal_symbols,
                          Relocatable_relocs*);

  // Emit relocations for a section.
  void
  relocate_relocs(const Relocate_info<size, big_endian>*,
                  unsigned int sh_type,
                  const unsigned char* prelocs,
                  size_t reloc_count,
                  Output_section* output_section,
                  off_t offset_in_output_section,
                  const Relocatable_relocs*,
                  unsigned char*,
                  Address view_address,
                  section_size_type,
                  unsigned char* reloc_view,
                  section_size_type reloc_view_size);

  // Return whether SYM is defined by the ABI.
  bool
  do_is_defined_by_abi(const Symbol* sym) const
  {
    return strcmp(sym->name(), "__tls_get_addr") == 0;
  }

  // Return the size of the GOT section.
  section_size_type
  got_size() const
  {
    gold_assert(this->got_ != NULL);
    return this->got_->data_size();
  }

  // Get the PLT section.
  const Output_data_plt_powerpc<size, big_endian>*
  plt_section() const
  {
    gold_assert(this->plt_ != NULL);
    return this->plt_;
  }

  // Get the .glink section.
  const Output_data_glink<size, big_endian>*
  glink_section() const
  {
    gold_assert(this->glink_ != NULL);
    return this->glink_;
  }

  // Get the GOT section.
  const Output_data_got_powerpc<size, big_endian>*
  got_section() const
  {
    gold_assert(this->got_ != NULL);
    return this->got_;
  }

  Object*
  do_make_elf_object(const std::string&, Input_file*, off_t,
                     const elfcpp::Ehdr<size, big_endian>&);

  // Return the number of entries in the GOT.
  unsigned int
  got_entry_count() const
  {
    if (this->got_ == NULL)
      return 0;
    return this->got_size() / (size / 8);
  }

  // Return the number of entries in the PLT.
  unsigned int
  plt_entry_count() const;

  // Return the offset of the first non-reserved PLT entry.
  unsigned int
  first_plt_entry_offset() const;

  // Return the size of each PLT entry.
  unsigned int
  plt_entry_size() const;

  // Add any special sections for this symbol to the gc work list.
  // For powerpc64, this adds the code section of a function
  // descriptor.
  void
  do_gc_mark_symbol(Symbol_table* symtab, Symbol* sym) const;

  // Handle target specific gc actions when adding a gc reference from
  // SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX
  // and DST_OFF.  For powerpc64, this adds a referenc to the code
  // section of a function descriptor.
  void
  do_gc_add_reference(Symbol_table* symtab,
                      Object* src_obj,
                      unsigned int src_shndx,
                      Object* dst_obj,
                      unsigned int dst_shndx,
                      Address dst_off) const;

 private:

  // The class which scans relocations.
  class Scan
  {
  public:
    Scan()
      : issued_non_pic_error_(false)
    { }

    static inline int
    get_reference_flags(unsigned int r_type);

    inline void
    local(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
          Sized_relobj_file<size, big_endian>* object,
          unsigned int data_shndx,
          Output_section* output_section,
          const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
          const elfcpp::Sym<size, big_endian>& lsym);

    inline void
    global(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
           Sized_relobj_file<size, big_endian>* object,
           unsigned int data_shndx,
           Output_section* output_section,
           const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
           Symbol* gsym);

    inline bool
    local_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
                                        Target_powerpc* ,
                                        Sized_relobj_file<size, big_endian>* ,
                                        unsigned int ,
                                        Output_section* ,
                                        const elfcpp::Rela<size, big_endian>& ,
                                        unsigned int ,
                                        const elfcpp::Sym<size, big_endian>&)
    { return false; }

    inline bool
    global_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
                                         Target_powerpc* ,
                                         Sized_relobj_file<size, big_endian>* ,
                                         unsigned int ,
                                         Output_section* ,
                                         const elfcpp::Rela<size,
                                                            big_endian>& ,
                                         unsigned int , Symbol*)
    { return false; }

  private:
    static void
    unsupported_reloc_local(Sized_relobj_file<size, big_endian>*,
                            unsigned int r_type);

    static void
    unsupported_reloc_global(Sized_relobj_file<size, big_endian>*,
                             unsigned int r_type, Symbol*);

    static void
    generate_tls_call(Symbol_table* symtab, Layout* layout,
                      Target_powerpc* target);

    void
    check_non_pic(Relobj*, unsigned int r_type);

    // Whether we have issued an error about a non-PIC compilation.
    bool issued_non_pic_error_;
  };

  Address
  symval_for_branch(Address value, const Sized_symbol<size>* gsym,
                    Powerpc_relobj<size, big_endian>* object,
                    unsigned int *dest_shndx);

  // The class which implements relocation.
  class Relocate
  {
   public:
    // Use 'at' branch hints when true, 'y' when false.
    // FIXME maybe: set this with an option.
    static const bool is_isa_v2 = true;

    enum skip_tls
    {
      CALL_NOT_EXPECTED = 0,
      CALL_EXPECTED = 1,
      CALL_SKIP = 2
    };

    Relocate()
      : call_tls_get_addr_(CALL_NOT_EXPECTED)
    { }

    ~Relocate()
    {
      if (this->call_tls_get_addr_ != CALL_NOT_EXPECTED)
        {
          // FIXME: This needs to specify the location somehow.
          gold_error(_("missing expected __tls_get_addr call"));
        }
    }

    // Do a relocation.  Return false if the caller should not issue
    // any warnings about this relocation.
    inline bool
    relocate(const Relocate_info<size, big_endian>*, Target_powerpc*,
             Output_section*, size_t relnum,
             const elfcpp::Rela<size, big_endian>&,
             unsigned int r_type, const Sized_symbol<size>*,
             const Symbol_value<size>*,
             unsigned char*,
             typename elfcpp::Elf_types<size>::Elf_Addr,
             section_size_type);

    // This is set if we should skip the next reloc, which should be a
    // call to __tls_get_addr.
    enum skip_tls call_tls_get_addr_;
  };

  // A class which returns the size required for a relocation type,
  // used while scanning relocs during a relocatable link.
  class Relocatable_size_for_reloc
  {
   public:
    unsigned int
    get_size_for_reloc(unsigned int, Relobj*)
    {
      gold_unreachable();
      return 0;
    }
  };

  // Optimize the TLS relocation type based on what we know about the
  // symbol.  IS_FINAL is true if the final address of this symbol is
  // known at link time.

  tls::Tls_optimization
  optimize_tls_gd(bool is_final)
  {
    // If we are generating a shared library, then we can't do anything
    // in the linker.
    if (parameters->options().shared())
      return tls::TLSOPT_NONE;

    if (!is_final)
      return tls::TLSOPT_TO_IE;
    return tls::TLSOPT_TO_LE;
  }

  tls::Tls_optimization
  optimize_tls_ld()
  {
    if (parameters->options().shared())
      return tls::TLSOPT_NONE;

    return tls::TLSOPT_TO_LE;
  }

  tls::Tls_optimization
  optimize_tls_ie(bool is_final)
  {
    if (!is_final || parameters->options().shared())
      return tls::TLSOPT_NONE;

    return tls::TLSOPT_TO_LE;
  }

  // Get the GOT section, creating it if necessary.
  Output_data_got_powerpc<size, big_endian>*
  got_section(Symbol_table*, Layout*);

  // Create glink.
  void
  make_glink_section(Layout*);

  // Create the PLT section.
  void
  make_plt_section(Layout*);

  // Create a PLT entry for a global symbol.
  void
  make_plt_entry(Layout*, Symbol*,
                 const elfcpp::Rela<size, big_endian>&,
                 const Sized_relobj<size, big_endian>* object);

  // Create a GOT entry for local dynamic __tls_get_addr.
  unsigned int
  tlsld_got_offset(Symbol_table* symtab, Layout* layout,
                   Sized_relobj_file<size, big_endian>* object);

  unsigned int
  tlsld_got_offset() const
  {
    return this->tlsld_got_offset_;
  }

  // Get the dynamic reloc section, creating it if necessary.
  Reloc_section*
  rela_dyn_section(Layout*);

  // Copy a relocation against a global symbol.
  void
  copy_reloc(Symbol_table* symtab, Layout* layout,
             Sized_relobj_file<size, big_endian>* object,
             unsigned int shndx, Output_section* output_section,
             Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc)
  {
    this->copy_relocs_.copy_reloc(symtab, layout,
                                  symtab->get_sized_symbol<size>(sym),
                                  object, shndx, output_section,
                                  reloc, this->rela_dyn_section(layout));
  }

  // Information about this specific target which we pass to the
  // general Target structure.
  static Target::Target_info powerpc_info;

  // The types of GOT entries needed for this platform.
  // These values are exposed to the ABI in an incremental link.
  // Do not renumber existing values without changing the version
  // number of the .gnu_incremental_inputs section.
  enum Got_type
  {
    GOT_TYPE_STANDARD,
    GOT_TYPE_TLSGD,     // double entry for @got@tlsgd
    GOT_TYPE_DTPREL,    // entry for @got@dtprel
    GOT_TYPE_TPREL      // entry for @got@tprel
  };

  // The GOT output section.
  Output_data_got_powerpc<size, big_endian>* got_;
  // The PLT output section.
  Output_data_plt_powerpc<size, big_endian>* plt_;
  // The .glink output section.
  Output_data_glink<size, big_endian>* glink_;
  // The dynamic reloc output section.
  Reloc_section* rela_dyn_;
  // Relocs saved to avoid a COPY reloc.
  Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
  // Space for variables copied with a COPY reloc.
  Output_data_space* dynbss_;
  // Offset of the GOT entry for local dynamic __tls_get_addr calls.
  unsigned int tlsld_got_offset_;
};

template<>
Target::Target_info Target_powerpc<32, true>::powerpc_info =
{
  32,                   // size
  true,                 // is_big_endian
  elfcpp::EM_PPC,       // machine_code
  false,                // has_make_symbol
  false,                // has_resolve
  false,                // has_code_fill
  true,                 // is_default_stack_executable
  false,                // can_icf_inline_merge_sections
  '\0',                 // wrap_char
  "/usr/lib/ld.so.1",   // dynamic_linker
  0x10000000,           // default_text_segment_address
  64 * 1024,            // abi_pagesize (overridable by -z max-page-size)
  4 * 1024,             // common_pagesize (overridable by -z common-page-size)
  false,                // isolate_execinstr
  0,                    // rosegment_gap
  elfcpp::SHN_UNDEF,    // small_common_shndx
  elfcpp::SHN_UNDEF,    // large_common_shndx
  0,                    // small_common_section_flags
  0,                    // large_common_section_flags
  NULL,                 // attributes_section
  NULL                  // attributes_vendor
};

template<>
Target::Target_info Target_powerpc<32, false>::powerpc_info =
{
  32,                   // size
  false,                // is_big_endian
  elfcpp::EM_PPC,       // machine_code
  false,                // has_make_symbol
  false,                // has_resolve
  false,                // has_code_fill
  true,                 // is_default_stack_executable
  false,                // can_icf_inline_merge_sections
  '\0',                 // wrap_char
  "/usr/lib/ld.so.1",   // dynamic_linker
  0x10000000,           // default_text_segment_address
  64 * 1024,            // abi_pagesize (overridable by -z max-page-size)
  4 * 1024,             // common_pagesize (overridable by -z common-page-size)
  false,                // isolate_execinstr
  0,                    // rosegment_gap
  elfcpp::SHN_UNDEF,    // small_common_shndx
  elfcpp::SHN_UNDEF,    // large_common_shndx
  0,                    // small_common_section_flags
  0,                    // large_common_section_flags
  NULL,                 // attributes_section
  NULL                  // attributes_vendor
};

template<>
Target::Target_info Target_powerpc<64, true>::powerpc_info =
{
  64,                   // size
  true,                 // is_big_endian
  elfcpp::EM_PPC64,     // machine_code
  false,                // has_make_symbol
  false,                // has_resolve
  false,                // has_code_fill
  true,                 // is_default_stack_executable
  false,                // can_icf_inline_merge_sections
  '\0',                 // wrap_char
  "/usr/lib/ld.so.1",   // dynamic_linker
  0x10000000,           // default_text_segment_address
  64 * 1024,            // abi_pagesize (overridable by -z max-page-size)
  4 * 1024,             // common_pagesize (overridable by -z common-page-size)
  false,                // isolate_execinstr
  0,                    // rosegment_gap
  elfcpp::SHN_UNDEF,    // small_common_shndx
  elfcpp::SHN_UNDEF,    // large_common_shndx
  0,                    // small_common_section_flags
  0,                    // large_common_section_flags
  NULL,                 // attributes_section
  NULL                  // attributes_vendor
};

template<>
Target::Target_info Target_powerpc<64, false>::powerpc_info =
{
  64,                   // size
  false,                // is_big_endian
  elfcpp::EM_PPC64,     // machine_code
  false,                // has_make_symbol
  false,                // has_resolve
  false,                // has_code_fill
  true,                 // is_default_stack_executable
  false,                // can_icf_inline_merge_sections
  '\0',                 // wrap_char
  "/usr/lib/ld.so.1",   // dynamic_linker
  0x10000000,           // default_text_segment_address
  64 * 1024,            // abi_pagesize (overridable by -z max-page-size)
  4 * 1024,             // common_pagesize (overridable by -z common-page-size)
  false,                // isolate_execinstr
  0,                    // rosegment_gap
  elfcpp::SHN_UNDEF,    // small_common_shndx
  elfcpp::SHN_UNDEF,    // large_common_shndx
  0,                    // small_common_section_flags
  0,                    // large_common_section_flags
  NULL,                 // attributes_section
  NULL                  // attributes_vendor
};

inline bool
is_branch_reloc(unsigned int r_type)
{
  return (r_type == elfcpp::R_POWERPC_REL24
          || r_type == elfcpp::R_PPC_PLTREL24
          || r_type == elfcpp::R_PPC_LOCAL24PC
          || r_type == elfcpp::R_POWERPC_REL14
          || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN
          || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN
          || r_type == elfcpp::R_POWERPC_ADDR24
          || r_type == elfcpp::R_POWERPC_ADDR14
          || r_type == elfcpp::R_POWERPC_ADDR14_BRTAKEN
          || r_type == elfcpp::R_POWERPC_ADDR14_BRNTAKEN);
}

// If INSN is an opcode that may be used with an @tls operand, return
// the transformed insn for TLS optimisation, otherwise return 0.  If
// REG is non-zero only match an insn with RB or RA equal to REG.
uint32_t
at_tls_transform(uint32_t insn, unsigned int reg)
{
  if ((insn & (0x3f << 26)) != 31 << 26)
    return 0;

  unsigned int rtra;
  if (reg == 0 || ((insn >> 11) & 0x1f) == reg)
    rtra = insn & ((1 << 26) - (1 << 16));
  else if (((insn >> 16) & 0x1f) == reg)
    rtra = (insn & (0x1f << 21)) | ((insn & (0x1f << 11)) << 5);
  else
    return 0;

  if ((insn & (0x3ff << 1)) == 266 << 1)
    // add -> addi
    insn = 14 << 26;
  else if ((insn & (0x1f << 1)) == 23 << 1
           && ((insn & (0x1f << 6)) < 14 << 6
               || ((insn & (0x1f << 6)) >= 16 << 6
                   && (insn & (0x1f << 6)) < 24 << 6)))
    // load and store indexed -> dform
    insn = (32 | ((insn >> 6) & 0x1f)) << 26;
  else if ((insn & (((0x1a << 5) | 0x1f) << 1)) == 21 << 1)
    // ldx, ldux, stdx, stdux -> ld, ldu, std, stdu
    insn = ((58 | ((insn >> 6) & 4)) << 26) | ((insn >> 6) & 1);
  else if ((insn & (((0x1f << 5) | 0x1f) << 1)) == 341 << 1)
    // lwax -> lwa
    insn = (58 << 26) | 2;
  else
    return 0;
  insn |= rtra;
  return insn;
}

// Modified version of symtab.h class Symbol member
// Given a direct absolute or pc-relative static relocation against
// the global symbol, this function returns whether a dynamic relocation
// is needed.

template<int size>
bool
needs_dynamic_reloc(const Symbol* gsym, int flags)
{
  // No dynamic relocations in a static link!
  if (parameters->doing_static_link())
    return false;

  // A reference to an undefined symbol from an executable should be
  // statically resolved to 0, and does not need a dynamic relocation.
  // This matches gnu ld behavior.
  if (gsym->is_undefined() && !parameters->options().shared())
    return false;

  // A reference to an absolute symbol does not need a dynamic relocation.
  if (gsym->is_absolute())
    return false;

  // An absolute reference within a position-independent output file
  // will need a dynamic relocation.
  if ((flags & Symbol::ABSOLUTE_REF)
      && parameters->options().output_is_position_independent())
    return true;

  // A function call that can branch to a local PLT entry does not need
  // a dynamic relocation.
  if ((flags & Symbol::FUNCTION_CALL) && gsym->has_plt_offset())
    return false;

  // A reference to any PLT entry in a non-position-independent executable
  // does not need a dynamic relocation.
  // Except due to having function descriptors on powerpc64 we don't define
  // functions to their plt code in an executable, so this doesn't apply.
  if (size == 32
      && !parameters->options().output_is_position_independent()
      && gsym->has_plt_offset())
    return false;

  // A reference to a symbol defined in a dynamic object or to a
  // symbol that is preemptible will need a dynamic relocation.
  if (gsym->is_from_dynobj()
      || gsym->is_undefined()
      || gsym->is_preemptible())
    return true;

  // For all other cases, return FALSE.
  return false;
}

// Modified version of symtab.h class Symbol member
// Whether we should use the PLT offset associated with a symbol for
// a relocation.  FLAGS is a set of Reference_flags.

template<int size>
bool
use_plt_offset(const Symbol* gsym, int flags)
{
  // If the symbol doesn't have a PLT offset, then naturally we
  // don't want to use it.
  if (!gsym->has_plt_offset())
    return false;

  // For a STT_GNU_IFUNC symbol we always have to use the PLT entry.
  if (gsym->type() == elfcpp::STT_GNU_IFUNC)
    return true;

  // If we are going to generate a dynamic relocation, then we will
  // wind up using that, so no need to use the PLT entry.
  if (needs_dynamic_reloc<size>(gsym, flags))
    return false;

  // If the symbol is from a dynamic object, we need to use the PLT
  // entry.
  if (gsym->is_from_dynobj())
    return true;

  // If we are generating a shared object, and gsym symbol is
  // undefined or preemptible, we need to use the PLT entry.
  if (parameters->options().shared()
      && (gsym->is_undefined() || gsym->is_preemptible()))
    return true;

  // If gsym is a call to a weak undefined symbol, we need to use
  // the PLT entry; the symbol may be defined by a library loaded
  // at runtime.
  if ((flags & Symbol::FUNCTION_CALL) && gsym->is_weak_undefined())
    return true;

  // Otherwise we can use the regular definition.
  return false;
}

template<int size, bool big_endian>
class Powerpc_relocate_functions
{
public:
  enum Overflow_check
  {
    CHECK_NONE,
    CHECK_SIGNED,
    CHECK_BITFIELD
  };

  enum Status
  {
    STATUS_OK,
    STATUS_OVERFLOW
  };

private:
  typedef Powerpc_relocate_functions<size, big_endian> This;
  typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;

  template<int valsize>
  static inline bool
  has_overflow_signed(Address value)
  {
    // limit = 1 << (valsize - 1) without shift count exceeding size of type
    Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1);
    limit <<= ((valsize - 1) >> 1);
    limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1));
    return value + limit > (limit << 1) - 1;
  }

  template<int valsize>
  static inline bool
  has_overflow_bitfield(Address value)
  {
    Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1);
    limit <<= ((valsize - 1) >> 1);
    limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1));
    return value > (limit << 1) - 1 && value + limit > (limit << 1) - 1;
  }

  template<int valsize>
  static inline Status
  overflowed(Address value, Overflow_check overflow)
  {
    if (overflow == CHECK_SIGNED)
      {
        if (has_overflow_signed<valsize>(value))
          return STATUS_OVERFLOW;
      }
    else if (overflow == CHECK_BITFIELD)
      {
        if (has_overflow_bitfield<valsize>(value))
          return STATUS_OVERFLOW;
      }
    return STATUS_OK;
  }

  // Do a simple RELA relocation
  template<int valsize>
  static inline Status
  rela(unsigned char* view, Address value, Overflow_check overflow)
  {
    typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
    Valtype* wv = reinterpret_cast<Valtype*>(view);
    elfcpp::Swap<valsize, big_endian>::writeval(wv, value);
    return overflowed<valsize>(value, overflow);
  }

  template<int valsize>
  static inline Status
  rela(unsigned char* view,
       unsigned int right_shift,
       typename elfcpp::Valtype_base<valsize>::Valtype dst_mask,
       Address value,
       Overflow_check overflow)
  {
    typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
    Valtype* wv = reinterpret_cast<Valtype*>(view);
    Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
    Valtype reloc = value >> right_shift;
    val &= ~dst_mask;
    reloc &= dst_mask;
    elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc);
    return overflowed<valsize>(value >> right_shift, overflow);
  }

  // Do a simple RELA relocation, unaligned.
  template<int valsize>
  static inline Status
  rela_ua(unsigned char* view, Address value, Overflow_check overflow)
  {
    elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, value);
    return overflowed<valsize>(value, overflow);
  }

  template<int valsize>
  static inline Status
  rela_ua(unsigned char* view,
          unsigned int right_shift,
          typename elfcpp::Valtype_base<valsize>::Valtype dst_mask,
          Address value,
          Overflow_check overflow)
  {
    typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
      Valtype;
    Valtype val = elfcpp::Swap<valsize, big_endian>::readval(view);
    Valtype reloc = value >> right_shift;
    val &= ~dst_mask;
    reloc &= dst_mask;
    elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, val | reloc);
    return overflowed<valsize>(value >> right_shift, overflow);
  }

public:
  // R_PPC64_ADDR64: (Symbol + Addend)
  static inline void
  addr64(unsigned char* view, Address value)
  { This::template rela<64>(view, value, CHECK_NONE); }

  // R_PPC64_UADDR64: (Symbol + Addend) unaligned
  static inline void
  addr64_u(unsigned char* view, Address value)
  { This::template rela_ua<64>(view, value, CHECK_NONE); }

  // R_POWERPC_ADDR32: (Symbol + Addend)
  static inline Status
  addr32(unsigned char* view, Address value, Overflow_check overflow)
  { return This::template rela<32>(view, value, overflow); }

  // R_POWERPC_UADDR32: (Symbol + Addend) unaligned
  static inline Status
  addr32_u(unsigned char* view, Address value, Overflow_check overflow)
  { return This::template rela_ua<32>(view, value, overflow); }

  // R_POWERPC_ADDR24: (Symbol + Addend) & 0x3fffffc
  static inline Status
  addr24(unsigned char* view, Address value, Overflow_check overflow)
  {
    Status stat = This::template rela<32>(view, 0, 0x03fffffc, value, overflow);
    if (overflow != CHECK_NONE && (value & 3) != 0)
      stat = STATUS_OVERFLOW;
    return stat;
  }

  // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff
  static inline Status
  addr16(unsigned char* view, Address value, Overflow_check overflow)
  { return This::template rela<16>(view, value, overflow); }

  // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff, unaligned
  static inline Status
  addr16_u(unsigned char* view, Address value, Overflow_check overflow)
  { return This::template rela_ua<16>(view, value, overflow); }

  // R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc
  static inline Status
  addr16_ds(unsigned char* view, Address value, Overflow_check overflow)
  {
    Status stat = This::template rela<16>(view, 0, 0xfffc, value, overflow);
    if (overflow != CHECK_NONE && (value & 3) != 0)
      stat = STATUS_OVERFLOW;
    return stat;
  }

  // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff
  static inline void
  addr16_hi(unsigned char* view, Address value)
  { This::template rela<16>(view, 16, 0xffff, value, CHECK_NONE); }

  // R_POWERPC_ADDR16_HA: ((Symbol + Addend + 0x8000) >> 16) & 0xffff
  static inline void
  addr16_ha(unsigned char* view, Address value)
  { This::addr16_hi(view, value + 0x8000); }

  // R_POWERPC_ADDR16_HIGHER: ((Symbol + Addend) >> 32) & 0xffff
  static inline void
  addr16_hi2(unsigned char* view, Address value)
  { This::template rela<16>(view, 32, 0xffff, value, CHECK_NONE); }

  // R_POWERPC_ADDR16_HIGHERA: ((Symbol + Addend + 0x8000) >> 32) & 0xffff
  static inline void
  addr16_ha2(unsigned char* view, Address value)
  { This::addr16_hi2(view, value + 0x8000); }

  // R_POWERPC_ADDR16_HIGHEST: ((Symbol + Addend) >> 48) & 0xffff
  static inline void
  addr16_hi3(unsigned char* view, Address value)
  { This::template rela<16>(view, 48, 0xffff, value, CHECK_NONE); }

  // R_POWERPC_ADDR16_HIGHESTA: ((Symbol + Addend + 0x8000) >> 48) & 0xffff
  static inline void
  addr16_ha3(unsigned char* view, Address value)
  { This::addr16_hi3(view, value + 0x8000); }

  // R_POWERPC_ADDR14: (Symbol + Addend) & 0xfffc
  static inline Status
  addr14(unsigned char* view, Address value, Overflow_check overflow)
  {
    Status stat = This::template rela<32>(view, 0, 0xfffc, value, overflow);
    if (overflow != CHECK_NONE && (value & 3) != 0)
      stat = STATUS_OVERFLOW;
    return stat;
  }
};

// Stash away the index of .got2 or .opd in a relocatable object, if
// such a section exists.

template<int size, bool big_endian>
bool
Powerpc_relobj<size, big_endian>::do_find_special_sections(
    Read_symbols_data* sd)
{
  const unsigned char* const pshdrs = sd->section_headers->data();
  const unsigned char* namesu = sd->section_names->data();
  const char* names = reinterpret_cast<const char*>(namesu);
  section_size_type names_size = sd->section_names_size;
  const unsigned char* s;

  s = this->find_shdr(pshdrs, size == 32 ? ".got2" : ".opd",
                      names, names_size, NULL);
  if (s != NULL)
    {
      unsigned int ndx = (s - pshdrs) / elfcpp::Elf_sizes<size>::shdr_size;
      this->special_ = ndx;
    }
  return Sized_relobj_file<size, big_endian>::do_find_special_sections(sd);
}

// Examine .rela.opd to build info about function entry points.

template<int size, bool big_endian>
void
Powerpc_relobj<size, big_endian>::scan_opd_relocs(
    size_t reloc_count,
    const unsigned char* prelocs,
    const unsigned char* plocal_syms)
{
  if (size == 64)
    {
      typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc
        Reltype;
      const int reloc_size
        = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size;
      const int sym_size = elfcpp::Elf_sizes<size>::sym_size;

      for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
        {
          Reltype reloc(prelocs);
          typename elfcpp::Elf_types<size>::Elf_WXword r_info
            = reloc.get_r_info();
          unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
          if (r_type == elfcpp::R_PPC64_ADDR64)
            {
              unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
              typename elfcpp::Elf_types<size>::Elf_Addr value;
              bool is_ordinary;
              unsigned int shndx;
              if (r_sym < this->local_symbol_count())
                {
                  typename elfcpp::Sym<size, big_endian>
                    lsym(plocal_syms + r_sym * sym_size);
                  shndx = lsym.get_st_shndx();
                  shndx = this->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
                  value = lsym.get_st_value();
                }
              else
                shndx = this->symbol_section_and_value(r_sym, &value,
                                                       &is_ordinary);
              this->set_opd_ent(reloc.get_r_offset(), shndx,
                                value + reloc.get_r_addend());
            }
        }
    }
}

template<int size, bool big_endian>
void
Powerpc_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd)
{
  Sized_relobj_file<size, big_endian>::do_read_relocs(rd);
  if (size == 64)
    {
      for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin();
           p != rd->relocs.end();
           ++p)
        {
          if (p->data_shndx == this->opd_shndx())
            {
              this->init_opd(this->section_size(this->opd_shndx()));
              this->scan_opd_relocs(p->reloc_count, p->contents->data(),
                                    rd->local_symbols->data());
              break;
            }
        }
    }
}

// Set up PowerPC target specific relobj.

template<int size, bool big_endian>
Object*
Target_powerpc<size, big_endian>::do_make_elf_object(
    const std::string& name,
    Input_file* input_file,
    off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr)
{
  int et = ehdr.get_e_type();
  // ET_EXEC files are valid input for --just-symbols/-R,
  // and we treat them as relocatable objects.
  if (et == elfcpp::ET_REL
      || (et == elfcpp::ET_EXEC && input_file->just_symbols()))
    {
      Powerpc_relobj<size, big_endian>* obj =
        new Powerpc_relobj<size, big_endian>(name, input_file, offset, ehdr);
      obj->setup();
      return obj;
    }
  else if (et == elfcpp::ET_DYN)
    {
      Sized_dynobj<size, big_endian>* obj =
        new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr);
      obj->setup();
      return obj;
    }
  else
    {
      gold_error(_("%s: unsupported ELF file type %d"), name.c_str(), et);
      return NULL;
    }
}

template<int size, bool big_endian>
class Output_data_got_powerpc : public Output_data_got<size, big_endian>
{
public:
  typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
  typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn;

  Output_data_got_powerpc(Symbol_table* symtab, Layout* layout)
    : Output_data_got<size, big_endian>(),
      symtab_(symtab), layout_(layout),
      header_ent_cnt_(size == 32 ? 3 : 1),
      header_index_(size == 32 ? 0x2000 : 0)
  {}

  class Got_entry;

  // Create a new GOT entry and return its offset.
  unsigned int
  add_got_entry(Got_entry got_entry)
  {
    this->reserve_ent();
    return Output_data_got<size, big_endian>::add_got_entry(got_entry);
  }

  // Create a pair of new GOT entries and return the offset of the first.
  unsigned int
  add_got_entry_pair(Got_entry got_entry_1, Got_entry got_entry_2)
  {
    this->reserve_ent(2);
    return Output_data_got<size, big_endian>::add_got_entry_pair(got_entry_1,
                                                                 got_entry_2);
  }

  unsigned int
  add_constant_pair(Valtype c1, Valtype c2)
  {
    this->reserve_ent(2);
    unsigned int got_offset = this->add_constant(c1);
    this->add_constant(c2);
    return got_offset;
  }

  // Offset of _GLOBAL_OFFSET_TABLE_.
  unsigned int
  g_o_t() const
  {
    return this->got_offset(this->header_index_);
  }

  // Offset of base used to access the GOT/TOC.
  // The got/toc pointer reg will be set to this value.
  typename elfcpp::Elf_types<size>::Elf_Off
  got_base_offset(const Powerpc_relobj<size, big_endian>* object) const
  {
    if (size == 32)
      return this->g_o_t();
    else
      return (this->output_section()->address()
              + object->toc_base_offset()
              - this->address());
  }

  // Ensure our GOT has a header.
  void
  set_final_data_size()
  {
    if (this->header_ent_cnt_ != 0)
      this->make_header();
    Output_data_got<size, big_endian>::set_final_data_size();
  }

  // First word of GOT header needs some values that are not
  // handled by Output_data_got so poke them in here.
  // For 32-bit, address of .dynamic, for 64-bit, address of TOCbase.
  void
  do_write(Output_file* of)
  {
    this->replace_constant(this->header_index_,
                           (size == 32
                            ? this->layout_->dynamic_section()->address()
                            : this->output_section()->address() + 0x8000));

    Output_data_got<size, big_endian>::do_write(of);
  }

private:
  void
  reserve_ent(unsigned int cnt = 1)
  {
    if (this->header_ent_cnt_ == 0)
      return;
    if (this->num_entries() + cnt > this->header_index_)
      this->make_header();
  }

  void
  make_header()
  {
    this->header_ent_cnt_ = 0;
    this->header_index_ = this->num_entries();
    if (size == 32)
      {
        Output_data_got<size, big_endian>::add_constant(0);
        Output_data_got<size, big_endian>::add_constant(0);
        Output_data_got<size, big_endian>::add_constant(0);

        // Define _GLOBAL_OFFSET_TABLE_ at the header
        this->symtab_->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
                                             Symbol_table::PREDEFINED,
                                             this, this->g_o_t(), 0,
                                             elfcpp::STT_OBJECT,
                                             elfcpp::STB_LOCAL,
                                             elfcpp::STV_HIDDEN,
                                             0, false, false);
      }
    else
      Output_data_got<size, big_endian>::add_constant(0);
  }

  // Stashed pointers.
  Symbol_table* symtab_;
  Layout* layout_;

  // GOT header size.
  unsigned int header_ent_cnt_;
  // GOT header index.
  unsigned int header_index_;
};

// Get the GOT section, creating it if necessary.

template<int size, bool big_endian>
Output_data_got_powerpc<size, big_endian>*
Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab,
                                              Layout* layout)
{
  if (this->got_ == NULL)
    {
      gold_assert(symtab != NULL && layout != NULL);

      this->got_
        = new Output_data_got_powerpc<size, big_endian>(symtab, layout);

      layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
                                      elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
                                      this->got_, ORDER_DATA, false);
    }

  return this->got_;
}

// Get the dynamic reloc section, creating it if necessary.

template<int size, bool big_endian>
typename Target_powerpc<size, big_endian>::Reloc_section*
Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout)
{
  if (this->rela_dyn_ == NULL)
    {
      gold_assert(layout != NULL);
      this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
      layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
                                      elfcpp::SHF_ALLOC, this->rela_dyn_,
                                      ORDER_DYNAMIC_RELOCS, false);
    }
  return this->rela_dyn_;
}

// A class to handle the PLT data.

template<int size, bool big_endian>
class Output_data_plt_powerpc : public Output_section_data_build
{
 public:
  typedef Output_data_reloc<elfcpp::SHT_RELA, true,
                            size, big_endian> Reloc_section;

  Output_data_plt_powerpc(Layout*, Target_powerpc<size, big_endian>*);

  // Add an entry to the PLT.
  void
  add_entry(Symbol*);

  // Return the .rela.plt section data.
  const Reloc_section*
  rel_plt() const
  {
    return this->rel_;
  }

  // Return the number of PLT entries.
  unsigned int
  entry_count() const
  {
    return ((this->current_data_size() - initial_plt_entry_size)
            / plt_entry_size);
  }

  // Return the offset of the first non-reserved PLT entry.
  static unsigned int
  first_plt_entry_offset()
  { return initial_plt_entry_size; }

  // Return the size of a PLT entry.
  static unsigned int
  get_plt_entry_size()
  { return plt_entry_size; }

 protected:
  void
  do_adjust_output_section(Output_section* os)
  {
    os->set_entsize(0);
  }

  // Write to a map file.
  void
  do_print_to_mapfile(Mapfile* mapfile) const
  { mapfile->print_output_data(this, _("** PLT")); }

 private:
  // The size of an entry in the PLT.
  static const int plt_entry_size = size == 32 ? 4 : 24;
  // The size of the first reserved entry.
  static const int initial_plt_entry_size = size == 32 ? 0 : 24;

  // Write out the PLT data.
  void
  do_write(Output_file*);

  // The reloc section.
  Reloc_section* rel_;
  // Allows access to .glink for do_write.
  Target_powerpc<size, big_endian>* targ_;
};

// Create the PLT section.

template<int size, bool big_endian>
Output_data_plt_powerpc<size, big_endian>::Output_data_plt_powerpc(
    Layout* layout,
    Target_powerpc<size, big_endian>* targ)
  : Output_section_data_build(size == 32 ? 4 : 8),
    targ_(targ)
{
  this->rel_ = new Reloc_section(false);
  layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
                                  elfcpp::SHF_ALLOC, this->rel_,
                                  ORDER_DYNAMIC_PLT_RELOCS, false);
}

// Add an entry to the PLT.

template<int size, bool big_endian>
void
Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym)
{
  if (!gsym->has_plt_offset())
    {
      off_t off = this->current_data_size();

      if (off == 0)
        off += initial_plt_entry_size;
      gsym->set_plt_offset(off);
      gsym->set_needs_dynsym_entry();
      this->rel_->add_global(gsym, elfcpp::R_POWERPC_JMP_SLOT, this, off, 0);
      off += plt_entry_size;
      this->set_current_data_size(off);
    }
}

static const uint32_t add_0_11_11       = 0x7c0b5a14;
static const uint32_t add_3_3_2         = 0x7c631214;
static const uint32_t add_3_3_13        = 0x7c636a14;
static const uint32_t add_11_0_11       = 0x7d605a14;
static const uint32_t add_12_2_11       = 0x7d825a14;
static const uint32_t addi_11_11        = 0x396b0000;
static const uint32_t addi_12_12        = 0x398c0000;
static const uint32_t addi_2_2          = 0x38420000;
static const uint32_t addi_3_2          = 0x38620000;
static const uint32_t addi_3_3          = 0x38630000;
static const uint32_t addis_0_2         = 0x3c020000;
static const uint32_t addis_0_13        = 0x3c0d0000;
static const uint32_t addis_11_11       = 0x3d6b0000;
static const uint32_t addis_11_30       = 0x3d7e0000;
static const uint32_t addis_12_12       = 0x3d8c0000;
static const uint32_t addis_12_2        = 0x3d820000;
static const uint32_t addis_3_2         = 0x3c620000;
static const uint32_t addis_3_13        = 0x3c6d0000;
static const uint32_t b                 = 0x48000000;
static const uint32_t bcl_20_31         = 0x429f0005;
static const uint32_t bctr              = 0x4e800420;
static const uint32_t blrl              = 0x4e800021;
static const uint32_t cror_15_15_15     = 0x4def7b82;
static const uint32_t cror_31_31_31     = 0x4ffffb82;
static const uint32_t ld_11_12          = 0xe96c0000;
static const uint32_t ld_11_2           = 0xe9620000;
static const uint32_t ld_2_1            = 0xe8410000;
static const uint32_t ld_2_11           = 0xe84b0000;
static const uint32_t ld_2_12           = 0xe84c0000;
static const uint32_t ld_2_2            = 0xe8420000;
static const uint32_t li_0_0            = 0x38000000;
static const uint32_t lis_0_0           = 0x3c000000;
static const uint32_t lis_11            = 0x3d600000;
static const uint32_t lis_12            = 0x3d800000;
static const uint32_t lwz_0_12          = 0x800c0000;
static const uint32_t lwz_11_11         = 0x816b0000;
static const uint32_t lwz_11_30         = 0x817e0000;
static const uint32_t lwz_12_12         = 0x818c0000;
static const uint32_t lwzu_0_12         = 0x840c0000;
static const uint32_t mflr_0            = 0x7c0802a6;
static const uint32_t mflr_11           = 0x7d6802a6;
static const uint32_t mflr_12           = 0x7d8802a6;
static const uint32_t mtctr_0           = 0x7c0903a6;
static const uint32_t mtctr_11          = 0x7d6903a6;
static const uint32_t mtlr_0            = 0x7c0803a6;
static const uint32_t mtlr_12           = 0x7d8803a6;
static const uint32_t nop               = 0x60000000;
static const uint32_t ori_0_0_0         = 0x60000000;
static const uint32_t std_2_1           = 0xf8410000;
static const uint32_t sub_11_11_12      = 0x7d6c5850;

// Write out the PLT.

template<int size, bool big_endian>
void
Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of)
{
  if (size == 32)
    {
      const off_t offset = this->offset();
      const section_size_type oview_size
        = convert_to_section_size_type(this->data_size());
      unsigned char* const oview = of->get_output_view(offset, oview_size);
      unsigned char* pov = oview;
      unsigned char* endpov = oview + oview_size;

      // The address the .glink branch table
      const Output_data_glink<size, big_endian>* glink
        = this->targ_->glink_section();
      elfcpp::Elf_types<32>::Elf_Addr branch_tab
        = glink->address() + glink->pltresolve();

      while (pov < endpov)
        {
          elfcpp::Swap<32, big_endian>::writeval(pov, branch_tab);
          pov += 4;
          branch_tab += 4;
        }

      of->write_output_view(offset, oview_size, oview);
    }
}

// Create the PLT section.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::make_plt_section(Layout* layout)
{
  if (this->plt_ == NULL)
    {
      if (this->glink_ == NULL)
        make_glink_section(layout);

      // Ensure that .rela.dyn always appears before .rela.plt  This is
      // necessary due to how, on PowerPC and some other targets, .rela.dyn
      // needs to include .rela.plt in it's range.
      this->rela_dyn_section(layout);

      this->plt_ = new Output_data_plt_powerpc<size, big_endian>(layout, this);
      layout->add_output_section_data(".plt",
                                      (size == 32
                                       ? elfcpp::SHT_PROGBITS
                                       : elfcpp::SHT_NOBITS),
                                      elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
                                      this->plt_,
                                      (size == 32
                                       ? ORDER_SMALL_DATA
                                       : ORDER_SMALL_BSS),
                                      false);
    }
}

// A class to handle .glink.

template<int size, bool big_endian>
class Output_data_glink : public Output_section_data
{
 public:
  static const int pltresolve_size = 16*4;

  Output_data_glink(Target_powerpc<size, big_endian>*);

  // Add an entry
  void
  add_entry(const Symbol*, const elfcpp::Rela<size, big_endian>&,
            const Sized_relobj<size, big_endian>*);

  unsigned int
  find_entry(const Symbol*, const elfcpp::Rela<size, big_endian>&,
             const Sized_relobj<size, big_endian>*) const;

  unsigned int
  glink_entry_size() const
  {
    if (size == 32)
      return 4 * 4;
    else
      // FIXME: We should be using multiple glink sections for
      // stubs to support > 33M applications.
      return 8 * 4;
  }

  off_t
  pltresolve() const
  {
    return this->pltresolve_;
  }

 protected:
  // Write to a map file.
  void
  do_print_to_mapfile(Mapfile* mapfile) const
  { mapfile->print_output_data(this, _("** glink")); }

 private:
  void
  set_final_data_size();

  // Write out .glink
  void
  do_write(Output_file*);

  class Glink_sym_ent
  {
  public:
    Glink_sym_ent(const Symbol* sym,
                  const elfcpp::Rela<size, big_endian>& reloc,
                  const Sized_relobj<size, big_endian>* object)
      : sym_(sym), addend_(0), object_(0)
    {
      if (size != 32)
        this->addend_ = reloc.get_r_addend();
      else if (parameters->options().output_is_position_independent()
               && (elfcpp::elf_r_type<size>(reloc.get_r_info())
                   == elfcpp::R_PPC_PLTREL24))
        {
          this->addend_ = reloc.get_r_addend();
          if (this->addend_ != 0)
            this->object_ = object;
        }
    }

    bool operator==(const Glink_sym_ent& that) const
    {
      return (this->sym_ == that.sym_
              && this->object_ == that.object_
              && this->addend_ == that.addend_);
    }

    const Symbol* sym_;
    unsigned int addend_;
    const Sized_relobj<size, big_endian>* object_;
  };

  class Glink_sym_ent_hash
  {
  public:
    size_t operator()(const Glink_sym_ent& ent) const
    {
      return (reinterpret_cast<uintptr_t>(ent.sym_)
              ^ reinterpret_cast<uintptr_t>(ent.object_)
              ^ ent.addend_);
    }
  };

  // Map sym/object/addend to index.
  typedef Unordered_map<Glink_sym_ent, unsigned int,
                        Glink_sym_ent_hash> Glink_entries;
  Glink_entries glink_entries_;

  // Offset of pltresolve stub (actually, branch table for 32-bit)
  off_t pltresolve_;

  // Allows access to .got and .plt for do_write.
  Target_powerpc<size, big_endian>* targ_;
};

// Create the glink section.

template<int size, bool big_endian>
Output_data_glink<size, big_endian>::Output_data_glink(
    Target_powerpc<size, big_endian>* targ)
  : Output_section_data(16),
    pltresolve_(0), targ_(targ)
{
}

// Add an entry to glink, if we do not already have one for this
// sym/object/addend combo.

template<int size, bool big_endian>
void
Output_data_glink<size, big_endian>::add_entry(
    const Symbol* gsym,
    const elfcpp::Rela<size, big_endian>& reloc,
    const Sized_relobj<size, big_endian>* object)
{
  Glink_sym_ent ent(gsym, reloc, object);
  unsigned int indx = this->glink_entries_.size();
  this->glink_entries_.insert(std::make_pair(ent, indx));
}

template<int size, bool big_endian>
unsigned int
Output_data_glink<size, big_endian>::find_entry(
    const Symbol* gsym,
    const elfcpp::Rela<size, big_endian>& reloc,
    const Sized_relobj<size, big_endian>* object) const
{
  Glink_sym_ent ent(gsym, reloc, object);
  typename Glink_entries::const_iterator p = this->glink_entries_.find(ent);
  gold_assert(p != this->glink_entries_.end());
  return p->second;
}

template<int size, bool big_endian>
void
Output_data_glink<size, big_endian>::set_final_data_size()
{
  unsigned int count = this->glink_entries_.size();
  off_t total = count;

  if (count != 0)
    {
      if (size == 32)
        {
          total *= 16;
          this->pltresolve_ = total;

          // space for branch table
          total += 4 * (count - 1);

          total += -total & 15;
          total += this->pltresolve_size;
        }
      else
        {
          total *= 32;
          this->pltresolve_ = total;
          total += this->pltresolve_size;

          // space for branch table
          total += 8 * count;
          if (count > 0x8000)
            total += 4 * (count - 0x8000);
        }
    }

  this->set_data_size(total);
}

static inline uint32_t
l(uint32_t a)
{
  return a & 0xffff;
}

static inline uint32_t
hi(uint32_t a)
{
  return l(a >> 16);
}

static inline uint32_t
ha(uint32_t a)
{
  return hi(a + 0x8000);
}

template<bool big_endian>
static inline void
write_insn(unsigned char* p, uint32_t v)
{
  elfcpp::Swap<32, big_endian>::writeval(p, v);
}

// Write out .glink.

template<int size, bool big_endian>
void
Output_data_glink<size, big_endian>::do_write(Output_file* of)
{
  const off_t off = this->offset();
  const section_size_type oview_size =
    convert_to_section_size_type(this->data_size());
  unsigned char* const oview = of->get_output_view(off, oview_size);
  unsigned char* p;

  // The base address of the .plt section.
  typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
  Address plt_base = this->targ_->plt_section()->address();

  const Output_data_got_powerpc<size, big_endian>* got
    = this->targ_->got_section();

  if (size == 64)
    {
      Address got_os_addr = got->output_section()->address();

      // Write out call stubs.
      typename Glink_entries::const_iterator g;
      for (g = this->glink_entries_.begin();
           g != this->glink_entries_.end();
           ++g)
        {
          Address plt_addr = plt_base + g->first.sym_->plt_offset();
          const Powerpc_relobj<size, big_endian>* ppcobj = static_cast
            <const Powerpc_relobj<size, big_endian>*>(g->first.object_);
          Address got_addr = got_os_addr + ppcobj->toc_base_offset();
          Address pltoff = plt_addr - got_addr;

          if (pltoff + 0x80008000 > 0xffffffff || (pltoff & 7) != 0)
            gold_error(_("%s: linkage table error against `%s'"),
                       g->first.object_->name().c_str(),
                       g->first.sym_->demangled_name().c_str());

          p = oview + g->second * this->glink_entry_size();
          if (ha(pltoff) != 0)
            {
              write_insn<big_endian>(p, addis_12_2 + ha(pltoff)),       p += 4;
              write_insn<big_endian>(p, std_2_1 + 40),                  p += 4;
              write_insn<big_endian>(p, ld_11_12 + l(pltoff)),          p += 4;
              if (ha(pltoff + 16) != ha(pltoff))
                {
                  write_insn<big_endian>(p, addi_12_12 + l(pltoff)),    p += 4;
                  pltoff = 0;
                }
              write_insn<big_endian>(p, mtctr_11),                      p += 4;
              write_insn<big_endian>(p, ld_2_12 + l(pltoff + 8)),       p += 4;
              write_insn<big_endian>(p, ld_11_12 + l(pltoff + 16)),     p += 4;
              write_insn<big_endian>(p, bctr),                          p += 4;
            }
          else
            {
              write_insn<big_endian>(p, std_2_1 + 40),                  p += 4;
              write_insn<big_endian>(p, ld_11_2 + l(pltoff)),           p += 4;
              if (ha(pltoff + 16) != ha(pltoff))
                {
                  write_insn<big_endian>(p, addi_2_2 + l(pltoff)),      p += 4;
                  pltoff = 0;
                }
              write_insn<big_endian>(p, mtctr_11),                      p += 4;
              write_insn<big_endian>(p, ld_11_2 + l(pltoff + 16)),      p += 4;
              write_insn<big_endian>(p, ld_2_2 + l(pltoff + 8)),        p += 4;
              write_insn<big_endian>(p, bctr),                          p += 4;
            }
        }

      // Write pltresolve stub.
      p = oview + this->pltresolve_;
      Address after_bcl = this->address() + this->pltresolve_ + 16;
      Address pltoff = plt_base - after_bcl;

      elfcpp::Swap<64, big_endian>::writeval(p, pltoff),        p += 8;

      write_insn<big_endian>(p, mflr_12),                       p += 4;
      write_insn<big_endian>(p, bcl_20_31),                     p += 4;
      write_insn<big_endian>(p, mflr_11),                       p += 4;
      write_insn<big_endian>(p, ld_2_11 + l(-16)),              p += 4;
      write_insn<big_endian>(p, mtlr_12),                       p += 4;
      write_insn<big_endian>(p, add_12_2_11),                   p += 4;
      write_insn<big_endian>(p, ld_11_12 + 0),                  p += 4;
      write_insn<big_endian>(p, ld_2_12 + 8),                   p += 4;
      write_insn<big_endian>(p, mtctr_11),                      p += 4;
      write_insn<big_endian>(p, ld_11_12 + 16),                 p += 4;
      write_insn<big_endian>(p, bctr),                          p += 4;
      while (p < oview + this->pltresolve_ + this->pltresolve_size)
        write_insn<big_endian>(p, nop), p += 4;

      // Write lazy link call stubs.
      uint32_t indx = 0;
      while (p < oview + oview_size)
        {
          if (indx < 0x8000)
            {
              write_insn<big_endian>(p, li_0_0 + indx),                 p += 4;
            }
          else
            {
              write_insn<big_endian>(p, lis_0_0 + hi(indx)),            p += 4;
              write_insn<big_endian>(p, ori_0_0_0 + l(indx)),           p += 4;
            }
          uint32_t branch_off = this->pltresolve_ + 8 - (p - oview);
          write_insn<big_endian>(p, b + (branch_off & 0x3fffffc)),      p += 4;
          indx++;
        }
    }
  else
    {
      // The address of _GLOBAL_OFFSET_TABLE_.
      Address g_o_t = got->address() + got->g_o_t();

      // Write out call stubs.
      typename Glink_entries::const_iterator g;
      for (g = this->glink_entries_.begin();
           g != this->glink_entries_.end();
           ++g)
        {
          Address plt_addr = plt_base + g->first.sym_->plt_offset();
          Address got_addr;
          const Address invalid_address = static_cast<Address>(-1);

          p = oview + g->second * this->glink_entry_size();
          if (parameters->options().output_is_position_independent())
            {
              const Powerpc_relobj<size, big_endian>* object = static_cast
                <const Powerpc_relobj<size, big_endian>*>(g->first.object_);
              if (object != NULL)
                {
                  unsigned int got2 = object->got2_shndx();
                  got_addr = g->first.object_->get_output_section_offset(got2);
                  gold_assert(got_addr != invalid_address);
                  got_addr += (g->first.object_->output_section(got2)->address()
                               + g->first.addend_);
                }
              else
                got_addr = g_o_t;

              Address pltoff = plt_addr - got_addr;
              if (ha(pltoff) == 0)
                {
                  write_insn<big_endian>(p +  0, lwz_11_30 + l(pltoff));
                  write_insn<big_endian>(p +  4, mtctr_11);
                  write_insn<big_endian>(p +  8, bctr);
                }
              else
                {
                  write_insn<big_endian>(p +  0, addis_11_30 + ha(pltoff));
                  write_insn<big_endian>(p +  4, lwz_11_11 + l(pltoff));
                  write_insn<big_endian>(p +  8, mtctr_11);
                  write_insn<big_endian>(p + 12, bctr);
                }
            }
          else
            {
              write_insn<big_endian>(p +  0, lis_11 + ha(plt_addr));
              write_insn<big_endian>(p +  4, lwz_11_11 + l(plt_addr));
              write_insn<big_endian>(p +  8, mtctr_11);
              write_insn<big_endian>(p + 12, bctr);
            }
        }

      // Write out pltresolve branch table.
      p = oview + this->pltresolve_;
      unsigned int the_end = oview_size - this->pltresolve_size;
      unsigned char* end_p = oview + the_end;
      while (p < end_p - 8 * 4)
        write_insn<big_endian>(p, b + end_p - p), p += 4;
      while (p < end_p)
        write_insn<big_endian>(p, nop), p += 4;

      // Write out pltresolve call stub.
      if (parameters->options().output_is_position_independent())
        {
          Address res0_off = this->pltresolve_;
          Address after_bcl_off = the_end + 12;
          Address bcl_res0 = after_bcl_off - res0_off;

          write_insn<big_endian>(p +  0, addis_11_11 + ha(bcl_res0));
          write_insn<big_endian>(p +  4, mflr_0);
          write_insn<big_endian>(p +  8, bcl_20_31);
          write_insn<big_endian>(p + 12, addi_11_11 + l(bcl_res0));
          write_insn<big_endian>(p + 16, mflr_12);
          write_insn<big_endian>(p + 20, mtlr_0);
          write_insn<big_endian>(p + 24, sub_11_11_12);

          Address got_bcl = g_o_t + 4 - (after_bcl_off + this->address());

          write_insn<big_endian>(p + 28, addis_12_12 + ha(got_bcl));
          if (ha(got_bcl) == ha(got_bcl + 4))
            {
              write_insn<big_endian>(p + 32, lwz_0_12 + l(got_bcl));
              write_insn<big_endian>(p + 36, lwz_12_12 + l(got_bcl + 4));
            }
          else
            {
              write_insn<big_endian>(p + 32, lwzu_0_12 + l(got_bcl));
              write_insn<big_endian>(p + 36, lwz_12_12 + 4);
            }
          write_insn<big_endian>(p + 40, mtctr_0);
          write_insn<big_endian>(p + 44, add_0_11_11);
          write_insn<big_endian>(p + 48, add_11_0_11);
          write_insn<big_endian>(p + 52, bctr);
          write_insn<big_endian>(p + 56, nop);
          write_insn<big_endian>(p + 60, nop);
        }
      else
        {
          Address res0 = this->pltresolve_ + this->address();

          write_insn<big_endian>(p + 0, lis_12 + ha(g_o_t + 4));
          write_insn<big_endian>(p + 4, addis_11_11 + ha(-res0));
          if (ha(g_o_t + 4) == ha(g_o_t + 8))
            write_insn<big_endian>(p + 8, lwz_0_12 + l(g_o_t + 4));
          else
            write_insn<big_endian>(p + 8, lwzu_0_12 + l(g_o_t + 4));
          write_insn<big_endian>(p + 12, addi_11_11 + l(-res0));
          write_insn<big_endian>(p + 16, mtctr_0);
          write_insn<big_endian>(p + 20, add_0_11_11);
          if (ha(g_o_t + 4) == ha(g_o_t + 8))
            write_insn<big_endian>(p + 24, lwz_12_12 + l(g_o_t + 8));
          else
            write_insn<big_endian>(p + 24, lwz_12_12 + 4);
          write_insn<big_endian>(p + 28, add_11_0_11);
          write_insn<big_endian>(p + 32, bctr);
          write_insn<big_endian>(p + 36, nop);
          write_insn<big_endian>(p + 40, nop);
          write_insn<big_endian>(p + 44, nop);
          write_insn<big_endian>(p + 48, nop);
          write_insn<big_endian>(p + 52, nop);
          write_insn<big_endian>(p + 56, nop);
          write_insn<big_endian>(p + 60, nop);
        }
      p += 64;
    }

  of->write_output_view(off, oview_size, oview);
}

// Create the glink section.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::make_glink_section(Layout* layout)
{
  if (this->glink_ == NULL)
    {
      this->glink_ = new Output_data_glink<size, big_endian>(this);
      layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS,
                                      elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
                                      this->glink_, ORDER_TEXT, false);
    }
}

// Create a PLT entry for a global symbol.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::make_plt_entry(
    Layout* layout,
    Symbol* gsym,
    const elfcpp::Rela<size, big_endian>& reloc,
    const Sized_relobj<size, big_endian>* object)
{
  if (this->plt_ == NULL)
    this->make_plt_section(layout);

  this->plt_->add_entry(gsym);

  this->glink_->add_entry(gsym, reloc, object);
}

// Return the number of entries in the PLT.

template<int size, bool big_endian>
unsigned int
Target_powerpc<size, big_endian>::plt_entry_count() const
{
  if (this->plt_ == NULL)
    return 0;
  return this->plt_->entry_count();
}

// Return the offset of the first non-reserved PLT entry.

template<int size, bool big_endian>
unsigned int
Target_powerpc<size, big_endian>::first_plt_entry_offset() const
{
  return Output_data_plt_powerpc<size, big_endian>::first_plt_entry_offset();
}

// Return the size of each PLT entry.

template<int size, bool big_endian>
unsigned int
Target_powerpc<size, big_endian>::plt_entry_size() const
{
  return Output_data_plt_powerpc<size, big_endian>::get_plt_entry_size();
}

// Create a GOT entry for local dynamic __tls_get_addr calls.

template<int size, bool big_endian>
unsigned int
Target_powerpc<size, big_endian>::tlsld_got_offset(
    Symbol_table* symtab,
    Layout* layout,
    Sized_relobj_file<size, big_endian>* object)
{
  if (this->tlsld_got_offset_ == -1U)
    {
      gold_assert(symtab != NULL && layout != NULL && object != NULL);
      Reloc_section* rela_dyn = this->rela_dyn_section(layout);
      Output_data_got_powerpc<size, big_endian>* got
        = this->got_section(symtab, layout);
      unsigned int got_offset = got->add_constant_pair(0, 0);
      rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got,
                          got_offset, 0);
      this->tlsld_got_offset_ = got_offset;
    }
  return this->tlsld_got_offset_;
}

// Get the Reference_flags for a particular relocation.

template<int size, bool big_endian>
int
Target_powerpc<size, big_endian>::Scan::get_reference_flags(unsigned int r_type)
{
  switch (r_type)
    {
    case elfcpp::R_POWERPC_NONE:
    case elfcpp::R_POWERPC_GNU_VTINHERIT:
    case elfcpp::R_POWERPC_GNU_VTENTRY:
    case elfcpp::R_PPC64_TOC:
      // No symbol reference.
      return 0;

    case elfcpp::R_PPC64_ADDR64:
    case elfcpp::R_PPC64_UADDR64:
    case elfcpp::R_POWERPC_ADDR32:
    case elfcpp::R_POWERPC_UADDR32:
    case elfcpp::R_POWERPC_ADDR16:
    case elfcpp::R_POWERPC_UADDR16:
    case elfcpp::R_POWERPC_ADDR16_LO:
    case elfcpp::R_POWERPC_ADDR16_HI:
    case elfcpp::R_POWERPC_ADDR16_HA:
      return Symbol::ABSOLUTE_REF;

    case elfcpp::R_POWERPC_ADDR24:
    case elfcpp::R_POWERPC_ADDR14:
    case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
    case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
      return Symbol::FUNCTION_CALL | Symbol::ABSOLUTE_REF;

    case elfcpp::R_POWERPC_REL32:
    case elfcpp::R_PPC_LOCAL24PC:
    case elfcpp::R_POWERPC_REL16:
    case elfcpp::R_POWERPC_REL16_LO:
    case elfcpp::R_POWERPC_REL16_HI:
    case elfcpp::R_POWERPC_REL16_HA:
      return Symbol::RELATIVE_REF;

    case elfcpp::R_POWERPC_REL24:
    case elfcpp::R_PPC_PLTREL24:
    case elfcpp::R_POWERPC_REL14:
    case elfcpp::R_POWERPC_REL14_BRTAKEN:
    case elfcpp::R_POWERPC_REL14_BRNTAKEN:
      return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;

    case elfcpp::R_POWERPC_GOT16:
    case elfcpp::R_POWERPC_GOT16_LO:
    case elfcpp::R_POWERPC_GOT16_HI:
    case elfcpp::R_POWERPC_GOT16_HA:
    case elfcpp::R_PPC64_TOC16:
    case elfcpp::R_PPC64_TOC16_LO:
    case elfcpp::R_PPC64_TOC16_HI:
    case elfcpp::R_PPC64_TOC16_HA:
    case elfcpp::R_PPC64_TOC16_DS:
    case elfcpp::R_PPC64_TOC16_LO_DS:
      // Absolute in GOT.
      return Symbol::ABSOLUTE_REF;

    case elfcpp::R_POWERPC_GOT_TPREL16:
    case elfcpp::R_POWERPC_TLS:
      return Symbol::TLS_REF;

    case elfcpp::R_POWERPC_COPY:
    case elfcpp::R_POWERPC_GLOB_DAT:
    case elfcpp::R_POWERPC_JMP_SLOT:
    case elfcpp::R_POWERPC_RELATIVE:
    case elfcpp::R_POWERPC_DTPMOD:
    default:
      // Not expected.  We will give an error later.
      return 0;
    }
}

// Report an unsupported relocation against a local symbol.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local(
    Sized_relobj_file<size, big_endian>* object,
    unsigned int r_type)
{
  gold_error(_("%s: unsupported reloc %u against local symbol"),
             object->name().c_str(), r_type);
}

// We are about to emit a dynamic relocation of type R_TYPE.  If the
// dynamic linker does not support it, issue an error.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object,
                                                      unsigned int r_type)
{
  gold_assert(r_type != elfcpp::R_POWERPC_NONE);

  // These are the relocation types supported by glibc for both 32-bit
  // and 64-bit powerpc.
  switch (r_type)
    {
    case elfcpp::R_POWERPC_NONE:
    case elfcpp::R_POWERPC_RELATIVE:
    case elfcpp::R_POWERPC_GLOB_DAT:
    case elfcpp::R_POWERPC_DTPMOD:
    case elfcpp::R_POWERPC_DTPREL:
    case elfcpp::R_POWERPC_TPREL:
    case elfcpp::R_POWERPC_JMP_SLOT:
    case elfcpp::R_POWERPC_COPY:
    case elfcpp::R_POWERPC_IRELATIVE:
    case elfcpp::R_POWERPC_ADDR32:
    case elfcpp::R_POWERPC_UADDR32:
    case elfcpp::R_POWERPC_ADDR24:
    case elfcpp::R_POWERPC_ADDR16:
    case elfcpp::R_POWERPC_UADDR16:
    case elfcpp::R_POWERPC_ADDR16_LO:
    case elfcpp::R_POWERPC_ADDR16_HI:
    case elfcpp::R_POWERPC_ADDR16_HA:
    case elfcpp::R_POWERPC_ADDR14:
    case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
    case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
    case elfcpp::R_POWERPC_REL32:
    case elfcpp::R_POWERPC_REL24:
    case elfcpp::R_POWERPC_TPREL16:
    case elfcpp::R_POWERPC_TPREL16_LO:
    case elfcpp::R_POWERPC_TPREL16_HI:
    case elfcpp::R_POWERPC_TPREL16_HA:
      return;

    default:
      break;
    }

  if (size == 64)
    {
      switch (r_type)
        {
          // These are the relocation types supported only on 64-bit.
        case elfcpp::R_PPC64_ADDR64:
        case elfcpp::R_PPC64_UADDR64:
        case elfcpp::R_PPC64_JMP_IREL:
        case elfcpp::R_PPC64_ADDR16_DS:
        case elfcpp::R_PPC64_ADDR16_LO_DS:
        case elfcpp::R_PPC64_ADDR16_HIGHER:
        case elfcpp::R_PPC64_ADDR16_HIGHEST:
        case elfcpp::R_PPC64_ADDR16_HIGHERA:
        case elfcpp::R_PPC64_ADDR16_HIGHESTA:
        case elfcpp::R_PPC64_REL64:
        case elfcpp::R_POWERPC_ADDR30:
        case elfcpp::R_PPC64_TPREL16_DS:
        case elfcpp::R_PPC64_TPREL16_LO_DS:
        case elfcpp::R_PPC64_TPREL16_HIGHER:
        case elfcpp::R_PPC64_TPREL16_HIGHEST:
        case elfcpp::R_PPC64_TPREL16_HIGHERA:
        case elfcpp::R_PPC64_TPREL16_HIGHESTA:
          return;

        default:
          break;
        }
    }
  else
    {
      switch (r_type)
        {
          // These are the relocation types supported only on 32-bit.
          // ??? glibc ld.so doesn't need to support these.
        case elfcpp::R_POWERPC_DTPREL16:
        case elfcpp::R_POWERPC_DTPREL16_LO:
        case elfcpp::R_POWERPC_DTPREL16_HI:
        case elfcpp::R_POWERPC_DTPREL16_HA:
          return;

        default:
          break;
        }
    }

  // This prevents us from issuing more than one error per reloc
  // section.  But we can still wind up issuing more than one
  // error per object file.
  if (this->issued_non_pic_error_)
    return;
  gold_assert(parameters->options().output_is_position_independent());
  object->error(_("requires unsupported dynamic reloc; "
                  "recompile with -fPIC"));
  this->issued_non_pic_error_ = true;
  return;
}

// Scan a relocation for a local symbol.

template<int size, bool big_endian>
inline void
Target_powerpc<size, big_endian>::Scan::local(
    Symbol_table* symtab,
    Layout* layout,
    Target_powerpc<size, big_endian>* target,
    Sized_relobj_file<size, big_endian>* object,
    unsigned int data_shndx,
    Output_section* output_section,
    const elfcpp::Rela<size, big_endian>& reloc,
    unsigned int r_type,
    const elfcpp::Sym<size, big_endian>& lsym)
{
  Powerpc_relobj<size, big_endian>* ppc_object
    = static_cast<Powerpc_relobj<size, big_endian>*>(object);

  switch (r_type)
    {
    case elfcpp::R_POWERPC_NONE:
    case elfcpp::R_POWERPC_GNU_VTINHERIT:
    case elfcpp::R_POWERPC_GNU_VTENTRY:
    case elfcpp::R_PPC64_TOCSAVE:
    case elfcpp::R_PPC_EMB_MRKREF:
    case elfcpp::R_POWERPC_TLS:
      break;

    case elfcpp::R_PPC64_TOC:
      {
        Output_data_got_powerpc<size, big_endian>* got
          = target->got_section(symtab, layout);
        if (parameters->options().output_is_position_independent())
          {
            Reloc_section* rela_dyn = target->rela_dyn_section(layout);
            rela_dyn->add_output_section_relative(got->output_section(),
                                                  elfcpp::R_POWERPC_RELATIVE,
                                                  output_section,
                                                  object, data_shndx,
                                                  reloc.get_r_offset(),
                                                  ppc_object->toc_base_offset());
          }
      }
      break;

    case elfcpp::R_PPC64_ADDR64:
    case elfcpp::R_PPC64_UADDR64:
    case elfcpp::R_POWERPC_ADDR32:
    case elfcpp::R_POWERPC_UADDR32:
    case elfcpp::R_POWERPC_ADDR24:
    case elfcpp::R_POWERPC_ADDR16:
    case elfcpp::R_POWERPC_ADDR16_LO:
    case elfcpp::R_POWERPC_ADDR16_HI:
    case elfcpp::R_POWERPC_ADDR16_HA:
    case elfcpp::R_POWERPC_UADDR16:
    case elfcpp::R_PPC64_ADDR16_HIGHER:
    case elfcpp::R_PPC64_ADDR16_HIGHERA:
    case elfcpp::R_PPC64_ADDR16_HIGHEST:
    case elfcpp::R_PPC64_ADDR16_HIGHESTA:
    case elfcpp::R_PPC64_ADDR16_DS:
    case elfcpp::R_PPC64_ADDR16_LO_DS:
    case elfcpp::R_POWERPC_ADDR14:
    case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
    case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
      // If building a shared library (or a position-independent
      // executable), we need to create a dynamic relocation for
      // this location.
      if (parameters->options().output_is_position_independent())
        {
          Reloc_section* rela_dyn = target->rela_dyn_section(layout);

          if ((size == 32 && r_type == elfcpp::R_POWERPC_ADDR32)
              || (size == 64 && r_type == elfcpp::R_PPC64_ADDR64))
            {
              unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
              rela_dyn->add_local_relative(object, r_sym,
                                           elfcpp::R_POWERPC_RELATIVE,
                                           output_section, data_shndx,
                                           reloc.get_r_offset(),
                                           reloc.get_r_addend(), false);
            }
          else
            {
              check_non_pic(object, r_type);
              unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
              rela_dyn->add_local(object, r_sym, r_type, output_section,
                                  data_shndx, reloc.get_r_offset(),
                                  reloc.get_r_addend());
            }
        }
      break;

    case elfcpp::R_PPC64_REL64:
    case elfcpp::R_POWERPC_REL32:
    case elfcpp::R_POWERPC_REL24:
    case elfcpp::R_PPC_LOCAL24PC:
    case elfcpp::R_POWERPC_REL16:
    case elfcpp::R_POWERPC_REL16_LO:
    case elfcpp::R_POWERPC_REL16_HI:
    case elfcpp::R_POWERPC_REL16_HA:
    case elfcpp::R_POWERPC_REL14:
    case elfcpp::R_POWERPC_REL14_BRTAKEN:
    case elfcpp::R_POWERPC_REL14_BRNTAKEN:
    case elfcpp::R_POWERPC_SECTOFF:
    case elfcpp::R_POWERPC_TPREL16:
    case elfcpp::R_POWERPC_DTPREL16:
    case elfcpp::R_POWERPC_SECTOFF_LO:
    case elfcpp::R_POWERPC_TPREL16_LO:
    case elfcpp::R_POWERPC_DTPREL16_LO:
    case elfcpp::R_POWERPC_SECTOFF_HI:
    case elfcpp::R_POWERPC_TPREL16_HI:
    case elfcpp::R_POWERPC_DTPREL16_HI:
    case elfcpp::R_POWERPC_SECTOFF_HA:
    case elfcpp::R_POWERPC_TPREL16_HA:
    case elfcpp::R_POWERPC_DTPREL16_HA:
    case elfcpp::R_PPC64_DTPREL16_HIGHER:
    case elfcpp::R_PPC64_TPREL16_HIGHER:
    case elfcpp::R_PPC64_DTPREL16_HIGHERA:
    case elfcpp::R_PPC64_TPREL16_HIGHERA:
    case elfcpp::R_PPC64_DTPREL16_HIGHEST:
    case elfcpp::R_PPC64_TPREL16_HIGHEST:
    case elfcpp::R_PPC64_DTPREL16_HIGHESTA:
    case elfcpp::R_PPC64_TPREL16_HIGHESTA:
    case elfcpp::R_PPC64_TPREL16_DS:
    case elfcpp::R_PPC64_TPREL16_LO_DS:
    case elfcpp::R_PPC64_DTPREL16_DS:
    case elfcpp::R_PPC64_DTPREL16_LO_DS:
    case elfcpp::R_PPC64_SECTOFF_DS:
    case elfcpp::R_PPC64_SECTOFF_LO_DS:
    case elfcpp::R_PPC64_TLSGD:
    case elfcpp::R_PPC64_TLSLD:
      break;

    case elfcpp::R_POWERPC_GOT16:
    case elfcpp::R_POWERPC_GOT16_LO:
    case elfcpp::R_POWERPC_GOT16_HI:
    case elfcpp::R_POWERPC_GOT16_HA:
    case elfcpp::R_PPC64_GOT16_DS:
    case elfcpp::R_PPC64_GOT16_LO_DS:
      {
        // The symbol requires a GOT entry.
        Output_data_got_powerpc<size, big_endian>* got
          = target->got_section(symtab, layout);
        unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());

        // If we are generating a shared object, we need to add a
        // dynamic relocation for this symbol's GOT entry.
        if (parameters->options().output_is_position_independent())
          {
            if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD))
              {
                Reloc_section* rela_dyn = target->rela_dyn_section(layout);
                unsigned int off;

                off = got->add_constant(0);
                object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off);
                rela_dyn->add_local_relative(object, r_sym,
                                             elfcpp::R_POWERPC_RELATIVE,
                                             got, off, 0, false);
              }
          }
        else
          got->add_local(object, r_sym, GOT_TYPE_STANDARD);
      }
      break;

    case elfcpp::R_PPC64_TOC16:
    case elfcpp::R_PPC64_TOC16_LO:
    case elfcpp::R_PPC64_TOC16_HI:
    case elfcpp::R_PPC64_TOC16_HA:
    case elfcpp::R_PPC64_TOC16_DS:
    case elfcpp::R_PPC64_TOC16_LO_DS:
      // We need a GOT section.
      target->got_section(symtab, layout);
      break;

    case elfcpp::R_POWERPC_GOT_TLSGD16:
    case elfcpp::R_POWERPC_GOT_TLSGD16_LO:
    case elfcpp::R_POWERPC_GOT_TLSGD16_HI:
    case elfcpp::R_POWERPC_GOT_TLSGD16_HA:
      {
        const tls::Tls_optimization tls_type = target->optimize_tls_gd(true);
        if (tls_type == tls::TLSOPT_NONE)
          {
            Output_data_got_powerpc<size, big_endian>* got
              = target->got_section(symtab, layout);
            unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
            unsigned int shndx = lsym.get_st_shndx();
            bool is_ordinary;
            shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
            gold_assert(is_ordinary);
            got->add_local_pair_with_rel(object, r_sym,
                                         shndx,
                                         GOT_TYPE_TLSGD,
                                         target->rela_dyn_section(layout),
                                         elfcpp::R_POWERPC_DTPMOD,
                                         elfcpp::R_POWERPC_DTPREL);
          }
        else if (tls_type == tls::TLSOPT_TO_LE)
          {
            // no GOT relocs needed for Local Exec.
          }
        else
          gold_unreachable();
      }
      break;

    case elfcpp::R_POWERPC_GOT_TLSLD16:
    case elfcpp::R_POWERPC_GOT_TLSLD16_LO:
    case elfcpp::R_POWERPC_GOT_TLSLD16_HI:
    case elfcpp::R_POWERPC_GOT_TLSLD16_HA:
      {
        const tls::Tls_optimization tls_type = target->optimize_tls_ld();
        if (tls_type == tls::TLSOPT_NONE)
          target->tlsld_got_offset(symtab, layout, object);
        else if (tls_type == tls::TLSOPT_TO_LE)
          {
            // no GOT relocs needed for Local Exec.
            if (parameters->options().emit_relocs())
              {
                Output_section* os = layout->tls_segment()->first_section();
                gold_assert(os != NULL);
                os->set_needs_symtab_index();
              }
          }
        else
          gold_unreachable();
      }
      break;

    case elfcpp::R_POWERPC_GOT_DTPREL16:
    case elfcpp::R_POWERPC_GOT_DTPREL16_LO:
    case elfcpp::R_POWERPC_GOT_DTPREL16_HI:
    case elfcpp::R_POWERPC_GOT_DTPREL16_HA:
      {
        Output_data_got_powerpc<size, big_endian>* got
          = target->got_section(symtab, layout);
        unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
        got->add_local_with_rel(object, r_sym, GOT_TYPE_DTPREL,
                                target->rela_dyn_section(layout),
                                elfcpp::R_POWERPC_DTPREL);
      }
      break;

    case elfcpp::R_POWERPC_GOT_TPREL16:
    case elfcpp::R_POWERPC_GOT_TPREL16_LO:
    case elfcpp::R_POWERPC_GOT_TPREL16_HI:
    case elfcpp::R_POWERPC_GOT_TPREL16_HA:
      {
        const tls::Tls_optimization tls_type = target->optimize_tls_ie(true);
        if (tls_type == tls::TLSOPT_NONE)
          {
            Output_data_got_powerpc<size, big_endian>* got
              = target->got_section(symtab, layout);
            unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
            got->add_local_with_rel(object, r_sym, GOT_TYPE_TPREL,
                                    target->rela_dyn_section(layout),
                                    elfcpp::R_POWERPC_TPREL);
          }
        else if (tls_type == tls::TLSOPT_TO_LE)
          {
            // no GOT relocs needed for Local Exec.
          }
        else
          gold_unreachable();
      }
      break;

    default:
      unsupported_reloc_local(object, r_type);
      break;
    }
}

// Report an unsupported relocation against a global symbol.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global(
    Sized_relobj_file<size, big_endian>* object,
    unsigned int r_type,
    Symbol* gsym)
{
  gold_error(_("%s: unsupported reloc %u against global symbol %s"),
             object->name().c_str(), r_type, gsym->demangled_name().c_str());
}

// Scan a relocation for a global symbol.

template<int size, bool big_endian>
inline void
Target_powerpc<size, big_endian>::Scan::global(
    Symbol_table* symtab,
    Layout* layout,
    Target_powerpc<size, big_endian>* target,
    Sized_relobj_file<size, big_endian>* object,
    unsigned int data_shndx,
    Output_section* output_section,
    const elfcpp::Rela<size, big_endian>& reloc,
    unsigned int r_type,
    Symbol* gsym)
{
  Powerpc_relobj<size, big_endian>* ppc_object
    = static_cast<Powerpc_relobj<size, big_endian>*>(object);

  switch (r_type)
    {
    case elfcpp::R_POWERPC_NONE:
    case elfcpp::R_POWERPC_GNU_VTINHERIT:
    case elfcpp::R_POWERPC_GNU_VTENTRY:
    case elfcpp::R_PPC_LOCAL24PC:
    case elfcpp::R_PPC_EMB_MRKREF:
    case elfcpp::R_POWERPC_TLS:
      break;

    case elfcpp::R_PPC64_TOC:
      {
        Output_data_got_powerpc<size, big_endian>* got
          = target->got_section(symtab, layout);
        if (parameters->options().output_is_position_independent())
          {
            Reloc_section* rela_dyn = target->rela_dyn_section(layout);
            Powerpc_relobj<size, big_endian>* symobj = ppc_object;
            if (data_shndx != ppc_object->opd_shndx())
              symobj = static_cast
                <Powerpc_relobj<size, big_endian>*>(gsym->object());
            rela_dyn->add_output_section_relative(got->output_section(),
                                                  elfcpp::R_POWERPC_RELATIVE,
                                                  output_section,
                                                  object, data_shndx,
                                                  reloc.get_r_offset(),
                                                  symobj->toc_base_offset());
          }
      }
      break;

    case elfcpp::R_PPC64_ADDR64:
    case elfcpp::R_PPC64_UADDR64:
    case elfcpp::R_POWERPC_ADDR32:
    case elfcpp::R_POWERPC_UADDR32:
    case elfcpp::R_POWERPC_ADDR24:
    case elfcpp::R_POWERPC_ADDR16:
    case elfcpp::R_POWERPC_ADDR16_LO:
    case elfcpp::R_POWERPC_ADDR16_HI:
    case elfcpp::R_POWERPC_ADDR16_HA:
    case elfcpp::R_POWERPC_UADDR16:
    case elfcpp::R_PPC64_ADDR16_HIGHER:
    case elfcpp::R_PPC64_ADDR16_HIGHERA:
    case elfcpp::R_PPC64_ADDR16_HIGHEST:
    case elfcpp::R_PPC64_ADDR16_HIGHESTA:
    case elfcpp::R_PPC64_ADDR16_DS:
    case elfcpp::R_PPC64_ADDR16_LO_DS:
    case elfcpp::R_POWERPC_ADDR14:
    case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
    case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
      {
        // Make a PLT entry if necessary.
        if (gsym->needs_plt_entry())
          {
            target->make_plt_entry(layout, gsym, reloc, 0);
            // Since this is not a PC-relative relocation, we may be
            // taking the address of a function. In that case we need to
            // set the entry in the dynamic symbol table to the address of
            // the PLT entry.
            if (size == 32
                && gsym->is_from_dynobj() && !parameters->options().shared())
              gsym->set_needs_dynsym_value();
          }
        // Make a dynamic relocation if necessary.
        if (needs_dynamic_reloc<size>(gsym, Scan::get_reference_flags(r_type)))
          {
            if (gsym->may_need_copy_reloc())
              {
                target->copy_reloc(symtab, layout, object,
                                   data_shndx, output_section, gsym, reloc);
              }
            else if (((size == 32 && r_type == elfcpp::R_POWERPC_ADDR32)
                      || (size == 64 && r_type == elfcpp::R_PPC64_ADDR64))
                     && (gsym->can_use_relative_reloc(false)
                         || data_shndx == ppc_object->opd_shndx()))
              {
                Reloc_section* rela_dyn = target->rela_dyn_section(layout);
                rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
                                              output_section, object,
                                              data_shndx, reloc.get_r_offset(),
                                              reloc.get_r_addend(), false);
              }
            else
              {
                Reloc_section* rela_dyn = target->rela_dyn_section(layout);
                check_non_pic(object, r_type);
                rela_dyn->add_global(gsym, r_type, output_section,
                                     object, data_shndx,
                                     reloc.get_r_offset(),
                                     reloc.get_r_addend());
              }
          }
      }
      break;

    case elfcpp::R_PPC_PLTREL24:
    case elfcpp::R_POWERPC_REL24:
      if (gsym->needs_plt_entry()
          || (!gsym->final_value_is_known()
              && (gsym->is_undefined()
                  || gsym->is_from_dynobj()
                  || gsym->is_preemptible())))
        target->make_plt_entry(layout, gsym, reloc, object);
      // Fall thru

    case elfcpp::R_PPC64_REL64:
    case elfcpp::R_POWERPC_REL32:
      // Make a dynamic relocation if necessary.
      if (needs_dynamic_reloc<size>(gsym, Scan::get_reference_flags(r_type)))
        {
          if (gsym->may_need_copy_reloc())
            {
              target->copy_reloc(symtab, layout, object,
                                 data_shndx, output_section, gsym,
                                 reloc);
            }
          else
            {
              Reloc_section* rela_dyn = target->rela_dyn_section(layout);
              check_non_pic(object, r_type);
              rela_dyn->add_global(gsym, r_type, output_section, object,
                                   data_shndx, reloc.get_r_offset(),
                                   reloc.get_r_addend());
            }
        }
      break;

    case elfcpp::R_POWERPC_REL16:
    case elfcpp::R_POWERPC_REL16_LO:
    case elfcpp::R_POWERPC_REL16_HI:
    case elfcpp::R_POWERPC_REL16_HA:
    case elfcpp::R_POWERPC_REL14:
    case elfcpp::R_POWERPC_REL14_BRTAKEN:
    case elfcpp::R_POWERPC_REL14_BRNTAKEN:
    case elfcpp::R_POWERPC_SECTOFF:
    case elfcpp::R_POWERPC_TPREL16:
    case elfcpp::R_POWERPC_DTPREL16:
    case elfcpp::R_POWERPC_SECTOFF_LO:
    case elfcpp::R_POWERPC_TPREL16_LO:
    case elfcpp::R_POWERPC_DTPREL16_LO:
    case elfcpp::R_POWERPC_SECTOFF_HI:
    case elfcpp::R_POWERPC_TPREL16_HI:
    case elfcpp::R_POWERPC_DTPREL16_HI:
    case elfcpp::R_POWERPC_SECTOFF_HA:
    case elfcpp::R_POWERPC_TPREL16_HA:
    case elfcpp::R_POWERPC_DTPREL16_HA:
    case elfcpp::R_PPC64_DTPREL16_HIGHER:
    case elfcpp::R_PPC64_TPREL16_HIGHER:
    case elfcpp::R_PPC64_DTPREL16_HIGHERA:
    case elfcpp::R_PPC64_TPREL16_HIGHERA:
    case elfcpp::R_PPC64_DTPREL16_HIGHEST:
    case elfcpp::R_PPC64_TPREL16_HIGHEST:
    case elfcpp::R_PPC64_DTPREL16_HIGHESTA:
    case elfcpp::R_PPC64_TPREL16_HIGHESTA:
    case elfcpp::R_PPC64_TPREL16_DS:
    case elfcpp::R_PPC64_TPREL16_LO_DS:
    case elfcpp::R_PPC64_DTPREL16_DS:
    case elfcpp::R_PPC64_DTPREL16_LO_DS:
    case elfcpp::R_PPC64_SECTOFF_DS:
    case elfcpp::R_PPC64_SECTOFF_LO_DS:
    case elfcpp::R_PPC64_TLSGD:
    case elfcpp::R_PPC64_TLSLD:
      break;

    case elfcpp::R_POWERPC_GOT16:
    case elfcpp::R_POWERPC_GOT16_LO:
    case elfcpp::R_POWERPC_GOT16_HI:
    case elfcpp::R_POWERPC_GOT16_HA:
    case elfcpp::R_PPC64_GOT16_DS:
    case elfcpp::R_PPC64_GOT16_LO_DS:
      {
        // The symbol requires a GOT entry.
        Output_data_got_powerpc<size, big_endian>* got;

        got = target->got_section(symtab, layout);
        if (gsym->final_value_is_known())
          got->add_global(gsym, GOT_TYPE_STANDARD);
        else
          {
            // If this symbol is not fully resolved, we need to add a
            // dynamic relocation for it.
            Reloc_section* rela_dyn = target->rela_dyn_section(layout);
            if (gsym->is_from_dynobj()
                || gsym->is_undefined()
                || gsym->is_preemptible())
              got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
                                       elfcpp::R_POWERPC_GLOB_DAT);
            else if (!gsym->has_got_offset(GOT_TYPE_STANDARD))
              {
                unsigned int off = got->add_constant(0);

                gsym->set_got_offset(GOT_TYPE_STANDARD, off);
                rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
                                              got, off, 0, false);
              }
          }
      }
      break;

    case elfcpp::R_PPC64_TOC16:
    case elfcpp::R_PPC64_TOC16_LO:
    case elfcpp::R_PPC64_TOC16_HI:
    case elfcpp::R_PPC64_TOC16_HA:
    case elfcpp::R_PPC64_TOC16_DS:
    case elfcpp::R_PPC64_TOC16_LO_DS:
      // We need a GOT section.
      target->got_section(symtab, layout);
      break;

    case elfcpp::R_POWERPC_GOT_TLSGD16:
    case elfcpp::R_POWERPC_GOT_TLSGD16_LO:
    case elfcpp::R_POWERPC_GOT_TLSGD16_HI:
    case elfcpp::R_POWERPC_GOT_TLSGD16_HA:
      {
        const bool final = gsym->final_value_is_known();
        const tls::Tls_optimization tls_type = target->optimize_tls_gd(final);
        if (tls_type == tls::TLSOPT_NONE)
          {
            Output_data_got_powerpc<size, big_endian>* got
              = target->got_section(symtab, layout);
            got->add_global_pair_with_rel(gsym, GOT_TYPE_TLSGD,
                                          target->rela_dyn_section(layout),
                                          elfcpp::R_POWERPC_DTPMOD,
                                          elfcpp::R_POWERPC_DTPREL);
          }
        else if (tls_type == tls::TLSOPT_TO_IE)
          {
            Output_data_got_powerpc<size, big_endian>* got
              = target->got_section(symtab, layout);
            got->add_global_with_rel(gsym, GOT_TYPE_TPREL,
                                     target->rela_dyn_section(layout),
                                     elfcpp::R_POWERPC_TPREL);
          }
        else if (tls_type == tls::TLSOPT_TO_LE)
          {
            // no GOT relocs needed for Local Exec.
          }
        else
          gold_unreachable();
      }
      break;

    case elfcpp::R_POWERPC_GOT_TLSLD16:
    case elfcpp::R_POWERPC_GOT_TLSLD16_LO:
    case elfcpp::R_POWERPC_GOT_TLSLD16_HI:
    case elfcpp::R_POWERPC_GOT_TLSLD16_HA:
      {
        const tls::Tls_optimization tls_type = target->optimize_tls_ld();
        if (tls_type == tls::TLSOPT_NONE)
          target->tlsld_got_offset(symtab, layout, object);
        else if (tls_type == tls::TLSOPT_TO_LE)
          {
            // no GOT relocs needed for Local Exec.
            if (parameters->options().emit_relocs())
              {
                Output_section* os = layout->tls_segment()->first_section();
                gold_assert(os != NULL);
                os->set_needs_symtab_index();
              }
          }
        else
          gold_unreachable();
      }
      break;

    case elfcpp::R_POWERPC_GOT_DTPREL16:
    case elfcpp::R_POWERPC_GOT_DTPREL16_LO:
    case elfcpp::R_POWERPC_GOT_DTPREL16_HI:
    case elfcpp::R_POWERPC_GOT_DTPREL16_HA:
      {
        Output_data_got_powerpc<size, big_endian>* got
          = target->got_section(symtab, layout);
        got->add_global_with_rel(gsym, GOT_TYPE_DTPREL,
                                 target->rela_dyn_section(layout),
                                 elfcpp::R_POWERPC_DTPREL);
      }
      break;

    case elfcpp::R_POWERPC_GOT_TPREL16:
    case elfcpp::R_POWERPC_GOT_TPREL16_LO:
    case elfcpp::R_POWERPC_GOT_TPREL16_HI:
    case elfcpp::R_POWERPC_GOT_TPREL16_HA:
      {
        const bool final = gsym->final_value_is_known();
        const tls::Tls_optimization tls_type = target->optimize_tls_ie(final);
        if (tls_type == tls::TLSOPT_NONE)
          {
            Output_data_got_powerpc<size, big_endian>* got
              = target->got_section(symtab, layout);
            got->add_global_with_rel(gsym, GOT_TYPE_TPREL,
                                     target->rela_dyn_section(layout),
                                     elfcpp::R_POWERPC_TPREL);
          }
        else if (tls_type == tls::TLSOPT_TO_LE)
          {
            // no GOT relocs needed for Local Exec.
          }
        else
          gold_unreachable();
      }
      break;

    default:
      unsupported_reloc_global(object, r_type, gsym);
      break;
    }
}

// Process relocations for gc.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::gc_process_relocs(
    Symbol_table* symtab,
    Layout* layout,
    Sized_relobj_file<size, big_endian>* object,
    unsigned int data_shndx,
    unsigned int,
    const unsigned char* prelocs,
    size_t reloc_count,
    Output_section* output_section,
    bool needs_special_offset_handling,
    size_t local_symbol_count,
    const unsigned char* plocal_symbols)
{
  typedef Target_powerpc<size, big_endian> Powerpc;
  typedef typename Target_powerpc<size, big_endian>::Scan Scan;
  Powerpc_relobj<size, big_endian>* ppc_object
    = static_cast<Powerpc_relobj<size, big_endian>*>(object);
  if (size == 64)
    ppc_object->set_opd_valid();
  if (size == 64 && data_shndx == ppc_object->opd_shndx())
    {
      typename Powerpc_relobj<size, big_endian>::Access_from::iterator p;
      for (p = ppc_object->access_from_map()->begin();
           p != ppc_object->access_from_map()->end();
           ++p)
        {
          Address dst_off = p->first;
          unsigned int dst_indx = ppc_object->get_opd_ent(dst_off);
          typename Powerpc_relobj<size, big_endian>::Section_refs::iterator s;
          for (s = p->second.begin(); s != p->second.end(); ++s)
            {
              Object* src_obj = s->first;
              unsigned int src_indx = s->second;
              symtab->gc()->add_reference(src_obj, src_indx,
                                          ppc_object, dst_indx);
            }
          p->second.clear();
        }
      ppc_object->access_from_map()->clear();
      // Don't look at .opd relocs as .opd will reference everything.
      return;
    }

  gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan,
                          typename Target_powerpc::Relocatable_size_for_reloc>(
    symtab,
    layout,
    this,
    object,
    data_shndx,
    prelocs,
    reloc_count,
    output_section,
    needs_special_offset_handling,
    local_symbol_count,
    plocal_symbols);
}

// Handle target specific gc actions when adding a gc reference from
// SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX
// and DST_OFF.  For powerpc64, this adds a referenc to the code
// section of a function descriptor.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::do_gc_add_reference(
    Symbol_table* symtab,
    Object* src_obj,
    unsigned int src_shndx,
    Object* dst_obj,
    unsigned int dst_shndx,
    Address dst_off) const
{
  Powerpc_relobj<size, big_endian>* ppc_object
    = static_cast<Powerpc_relobj<size, big_endian>*>(dst_obj);
  if (size == 64 && dst_shndx == ppc_object->opd_shndx())
    {
      if (ppc_object->opd_valid())
        {
          dst_shndx = ppc_object->get_opd_ent(dst_off);
          symtab->gc()->add_reference(src_obj, src_shndx, dst_obj, dst_shndx);
        }
      else
        {
          // If we haven't run scan_opd_relocs, we must delay
          // processing this function descriptor reference.
          ppc_object->add_reference(src_obj, src_shndx, dst_off);
        }
    }
}

// Add any special sections for this symbol to the gc work list.
// For powerpc64, this adds the code section of a function
// descriptor.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::do_gc_mark_symbol(
    Symbol_table* symtab,
    Symbol* sym) const
{
  if (size == 64)
    {
      Powerpc_relobj<size, big_endian>* ppc_object
        = static_cast<Powerpc_relobj<size, big_endian>*>(sym->object());
      bool is_ordinary;
      unsigned int shndx = sym->shndx(&is_ordinary);
      if (is_ordinary && shndx == ppc_object->opd_shndx())
        {
          Sized_symbol<size>* gsym = symtab->get_sized_symbol<size>(sym);
          Address dst_off = gsym->value();
          unsigned int dst_indx = ppc_object->get_opd_ent(dst_off);
          symtab->gc()->worklist().push(Section_id(ppc_object, dst_indx));
        }
    }
}

// Scan relocations for a section.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::scan_relocs(
    Symbol_table* symtab,
    Layout* layout,
    Sized_relobj_file<size, big_endian>* object,
    unsigned int data_shndx,
    unsigned int sh_type,
    const unsigned char* prelocs,
    size_t reloc_count,
    Output_section* output_section,
    bool needs_special_offset_handling,
    size_t local_symbol_count,
    const unsigned char* plocal_symbols)
{
  typedef Target_powerpc<size, big_endian> Powerpc;
  typedef typename Target_powerpc<size, big_endian>::Scan Scan;

  if (sh_type == elfcpp::SHT_REL)
    {
      gold_error(_("%s: unsupported REL reloc section"),
                 object->name().c_str());
      return;
    }

  if (size == 32)
    {
      static Output_data_space* sdata;

      // Define _SDA_BASE_ at the start of the .sdata section.
      if (sdata == NULL)
        {
          // layout->find_output_section(".sdata") == NULL
          sdata = new Output_data_space(4, "** sdata");
          Output_section* os
            = layout->add_output_section_data(".sdata", 0,
                                              elfcpp::SHF_ALLOC
                                              | elfcpp::SHF_WRITE,
                                              sdata, ORDER_SMALL_DATA, false);
          symtab->define_in_output_data("_SDA_BASE_", NULL,
                                        Symbol_table::PREDEFINED,
                                        os, 32768, 0, elfcpp::STT_OBJECT,
                                        elfcpp::STB_LOCAL, elfcpp::STV_HIDDEN,
                                        0, false, false);
        }
    }

  gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
    symtab,
    layout,
    this,
    object,
    data_shndx,
    prelocs,
    reloc_count,
    output_section,
    needs_special_offset_handling,
    local_symbol_count,
    plocal_symbols);
}

// Finalize the sections.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::do_finalize_sections(
    Layout* layout,
    const Input_objects*,
    Symbol_table*)
{
  // Fill in some more dynamic tags.
  const Reloc_section* rel_plt = (this->plt_ == NULL
                                  ? NULL
                                  : this->plt_->rel_plt());
  layout->add_target_dynamic_tags(false, this->plt_, rel_plt,
                                  this->rela_dyn_, true, size == 32);

  Output_data_dynamic* odyn = layout->dynamic_data();
  if (size == 32)
    {
      if (this->got_ != NULL)
        {
          this->got_->finalize_data_size();
          odyn->add_section_plus_offset(elfcpp::DT_PPC_GOT,
                                        this->got_, this->got_->g_o_t());
        }
    }
  else
    {
      if (this->glink_ != NULL)
        {
          this->glink_->finalize_data_size();
          odyn->add_section_plus_offset(elfcpp::DT_PPC64_GLINK,
                                        this->glink_,
                                        (this->glink_->pltresolve()
                                         + this->glink_->pltresolve_size - 32));
        }
    }

  // Emit any relocs we saved in an attempt to avoid generating COPY
  // relocs.
  if (this->copy_relocs_.any_saved_relocs())
    this->copy_relocs_.emit(this->rela_dyn_section(layout));
}

// Return the value to use for a branch relocation.

template<int size, bool big_endian>
typename elfcpp::Elf_types<size>::Elf_Addr
Target_powerpc<size, big_endian>::symval_for_branch(
    Address value,
    const Sized_symbol<size>* gsym,
    Powerpc_relobj<size, big_endian>* object,
    unsigned int *dest_shndx)
{
  *dest_shndx = 0;
  if (size == 32)
    return value;

  // If the symbol is defined in an opd section, ie. is a function
  // descriptor, use the function descriptor code entry address
  Powerpc_relobj<size, big_endian>* symobj = object;
  if (gsym != NULL)
    symobj = static_cast<Powerpc_relobj<size, big_endian>*>(gsym->object());
  unsigned int shndx = symobj->opd_shndx();
  if (shndx == 0)
    return value;
  Address opd_addr = symobj->get_output_section_offset(shndx);
  gold_assert(opd_addr != invalid_address);
  opd_addr += symobj->output_section(shndx)->address();
  if (value >= opd_addr && value < opd_addr + symobj->section_size(shndx))
    {
      Address sec_off;
      *dest_shndx = symobj->get_opd_ent(value - opd_addr, &sec_off);
      Address sec_addr = symobj->get_output_section_offset(*dest_shndx);
      gold_assert(sec_addr != invalid_address);
      sec_addr += symobj->output_section(*dest_shndx)->address();
      value = sec_addr + sec_off;
    }
  return value;
}

// Perform a relocation.

template<int size, bool big_endian>
inline bool
Target_powerpc<size, big_endian>::Relocate::relocate(
    const Relocate_info<size, big_endian>* relinfo,
    Target_powerpc* target,
    Output_section* os,
    size_t relnum,
    const elfcpp::Rela<size, big_endian>& rela,
    unsigned int r_type,
    const Sized_symbol<size>* gsym,
    const Symbol_value<size>* psymval,
    unsigned char* view,
    Address address,
    section_size_type view_size)
{

  bool is_tls_call = ((r_type == elfcpp::R_POWERPC_REL24
                       || r_type == elfcpp::R_PPC_PLTREL24)
                      && gsym != NULL
                      && strcmp(gsym->name(), "__tls_get_addr") == 0);
  enum skip_tls last_tls = this->call_tls_get_addr_;
  this->call_tls_get_addr_ = CALL_NOT_EXPECTED;
  if (is_tls_call)
    {
      if (last_tls == CALL_NOT_EXPECTED)
        gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
                               _("__tls_get_addr call lacks marker reloc"));
      else if (last_tls == CALL_SKIP)
        return false;
    }
  else if (last_tls != CALL_NOT_EXPECTED)
    gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
                           _("missing expected __tls_get_addr call"));

  typedef Powerpc_relocate_functions<size, big_endian> Reloc;
  typedef typename elfcpp::Swap<32, big_endian>::Valtype Insn;
  Powerpc_relobj<size, big_endian>* const object
    = static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object);
  Address value = 0;
  bool has_plt_value = false;
  if (gsym != NULL
      && use_plt_offset<size>(gsym, Scan::get_reference_flags(r_type)))
    {
      const Output_data_glink<size, big_endian>* glink
        = target->glink_section();
      unsigned int glink_index = glink->find_entry(gsym, rela, object);
      value = glink->address() + glink_index * glink->glink_entry_size();
      has_plt_value = true;
    }

  if (r_type == elfcpp::R_POWERPC_GOT16
      || r_type == elfcpp::R_POWERPC_GOT16_LO
      || r_type == elfcpp::R_POWERPC_GOT16_HI
      || r_type == elfcpp::R_POWERPC_GOT16_HA
      || r_type == elfcpp::R_PPC64_GOT16_DS
      || r_type == elfcpp::R_PPC64_GOT16_LO_DS)
    {
      if (gsym != NULL)
        {
          gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
          value = gsym->got_offset(GOT_TYPE_STANDARD);
        }
      else
        {
          unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
          gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
          value = object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
        }
      value -= target->got_section()->got_base_offset(object);
    }
  else if (r_type == elfcpp::R_PPC64_TOC)
    {
      value = (target->got_section()->output_section()->address()
               + object->toc_base_offset());
    }
  else if (gsym != NULL
           && (r_type == elfcpp::R_POWERPC_REL24
               || r_type == elfcpp::R_PPC_PLTREL24)
           && has_plt_value)
    {
      if (size == 64)
        {
          typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
          Valtype* wv = reinterpret_cast<Valtype*>(view);
          bool can_plt_call = false;
          if (rela.get_r_offset() + 8 <= view_size)
            {
              Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv);
              Valtype insn2 = elfcpp::Swap<32, big_endian>::readval(wv + 1);
              if ((insn & 1) != 0
                  && (insn2 == nop
                      || insn2 == cror_15_15_15 || insn2 == cror_31_31_31))
                {
                  elfcpp::Swap<32, big_endian>::writeval(wv + 1, ld_2_1 + 40);
                  can_plt_call = true;
                }
            }
          if (!can_plt_call)
            {
              // If we don't have a branch and link followed by a nop,
              // we can't go via the plt because there is no place to
              // put a toc restoring instruction.
              // Unless we know we won't be returning.
              if (strcmp(gsym->name(), "__libc_start_main") == 0)
                can_plt_call = true;
            }
          if (!can_plt_call)
            {
              // This is not an error in one special case: A self
              // call.  It isn't possible to cheaply verify we have
              // such a call so just check for a call to the same
              // section.
              bool ok = false;
              if (gsym->source() == Symbol::FROM_OBJECT
                  && gsym->object() == object)
                {
                  Address addend = rela.get_r_addend();
                  unsigned int dest_shndx;
                  value = psymval->value(object, addend);
                  value = target->symval_for_branch(value, gsym, object,
                                                    &dest_shndx);
                  bool is_ordinary;
                  if (dest_shndx == 0)
                    dest_shndx = gsym->shndx(&is_ordinary);
                  ok = dest_shndx == relinfo->data_shndx;
                }
              if (!ok)
                gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
                                       _("call lacks nop, can't restore toc; "
                                         "recompile with -fPIC"));
            }
        }
    }
  else if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16
           || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO
           || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI
           || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA)
    {
      // First instruction of a global dynamic sequence, arg setup insn.
      const bool final = gsym == NULL || gsym->final_value_is_known();
      const tls::Tls_optimization tls_type = target->optimize_tls_gd(final);
      enum Got_type got_type = GOT_TYPE_STANDARD;
      if (tls_type == tls::TLSOPT_NONE)
        got_type = GOT_TYPE_TLSGD;
      else if (tls_type == tls::TLSOPT_TO_IE)
        got_type = GOT_TYPE_TPREL;
      if (got_type != GOT_TYPE_STANDARD)
        {
          if (gsym != NULL)
            {
              gold_assert(gsym->has_got_offset(got_type));
              value = gsym->got_offset(got_type);
            }
          else
            {
              unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
              gold_assert(object->local_has_got_offset(r_sym, got_type));
              value = object->local_got_offset(r_sym, got_type);
            }
          value -= target->got_section()->got_base_offset(object);
        }
      if (tls_type == tls::TLSOPT_TO_IE)
        {
          if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16
              || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO)
            {
              Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
              Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
              insn &= (1 << 26) - (1 << 16); // extract rt,ra from addi
              if (size == 32)
                insn |= 32 << 26; // lwz
              else
                insn |= 58 << 26; // ld
              elfcpp::Swap<32, big_endian>::writeval(iview, insn);
            }
          r_type += (elfcpp::R_POWERPC_GOT_TPREL16
                     - elfcpp::R_POWERPC_GOT_TLSGD16);
        }
      else if (tls_type == tls::TLSOPT_TO_LE)
        {
          if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16
              || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO)
            {
              Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
              Insn insn = addis_3_13;
              if (size == 32)
                insn = addis_3_2;
              elfcpp::Swap<32, big_endian>::writeval(iview, insn);
              r_type = elfcpp::R_POWERPC_TPREL16_HA;
              value = psymval->value(object, rela.get_r_addend());
            }
          else
            {
              Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
              Insn insn = nop;
              elfcpp::Swap<32, big_endian>::writeval(iview, insn);
              r_type = elfcpp::R_POWERPC_NONE;
            }
        }
    }
  else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16
           || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO
           || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI
           || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA)
    {
      // First instruction of a local dynamic sequence, arg setup insn.
      const tls::Tls_optimization tls_type = target->optimize_tls_ld();
      if (tls_type == tls::TLSOPT_NONE)
        {
          value = target->tlsld_got_offset();
          value -= target->got_section()->got_base_offset(object);
        }
      else
        {
          gold_assert(tls_type == tls::TLSOPT_TO_LE);
          if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16
              || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO)
            {
              Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
              Insn insn = addis_3_13;
              if (size == 32)
                insn = addis_3_2;
              elfcpp::Swap<32, big_endian>::writeval(iview, insn);
              r_type = elfcpp::R_POWERPC_TPREL16_HA;
              value = dtp_offset;
            }
          else
            {
              Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
              Insn insn = nop;
              elfcpp::Swap<32, big_endian>::writeval(iview, insn);
              r_type = elfcpp::R_POWERPC_NONE;
            }
        }
    }
  else if (r_type == elfcpp::R_POWERPC_GOT_DTPREL16
           || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_LO
           || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HI
           || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HA)
    {
      // Accesses relative to a local dynamic sequence address,
      // no optimisation here.
      if (gsym != NULL)
        {
          gold_assert(gsym->has_got_offset(GOT_TYPE_DTPREL));
          value = gsym->got_offset(GOT_TYPE_DTPREL);
        }
      else
        {
          unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
          gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_DTPREL));
          value = object->local_got_offset(r_sym, GOT_TYPE_DTPREL);
        }
      value -= target->got_section()->got_base_offset(object);
    }
  else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16
           || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO
           || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI
           || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA)
    {
      // First instruction of initial exec sequence.
      const bool final = gsym == NULL || gsym->final_value_is_known();
      const tls::Tls_optimization tls_type = target->optimize_tls_ie(final);
      if (tls_type == tls::TLSOPT_NONE)
        {
          if (gsym != NULL)
            {
              gold_assert(gsym->has_got_offset(GOT_TYPE_TPREL));
              value = gsym->got_offset(GOT_TYPE_TPREL);
            }
          else
            {
              unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
              gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_TPREL));
              value = object->local_got_offset(r_sym, GOT_TYPE_TPREL);
            }
          value -= target->got_section()->got_base_offset(object);
        }
      else
        {
          gold_assert(tls_type == tls::TLSOPT_TO_LE);
          if (r_type == elfcpp::R_POWERPC_GOT_TPREL16
              || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO)
            {
              Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
              Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
              insn &= (1 << 26) - (1 << 21); // extract rt from ld
              if (size == 32)
                insn |= addis_0_2;
              else
                insn |= addis_0_13;
              elfcpp::Swap<32, big_endian>::writeval(iview, insn);
              r_type = elfcpp::R_POWERPC_TPREL16_HA;
              value = psymval->value(object, rela.get_r_addend());
            }
          else
            {
              Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
              Insn insn = nop;
              elfcpp::Swap<32, big_endian>::writeval(iview, insn);
              r_type = elfcpp::R_POWERPC_NONE;
            }
        }
    }
  else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD)
           || (size == 32 && r_type == elfcpp::R_PPC_TLSGD))
    {
      // Second instruction of a global dynamic sequence,
      // the __tls_get_addr call
      this->call_tls_get_addr_ = CALL_EXPECTED;
      const bool final = gsym == NULL || gsym->final_value_is_known();
      const tls::Tls_optimization tls_type = target->optimize_tls_gd(final);
      if (tls_type != tls::TLSOPT_NONE)
        {
          if (tls_type == tls::TLSOPT_TO_IE)
            {
              Insn* iview = reinterpret_cast<Insn*>(view);
              Insn insn = add_3_3_13;
              if (size == 32)
                insn = add_3_3_2;
              elfcpp::Swap<32, big_endian>::writeval(iview, insn);
              r_type = elfcpp::R_POWERPC_NONE;
            }
          else
            {
              Insn* iview = reinterpret_cast<Insn*>(view);
              Insn insn = addi_3_3;
              elfcpp::Swap<32, big_endian>::writeval(iview, insn);
              r_type = elfcpp::R_POWERPC_TPREL16_LO;
              view += 2 * big_endian;
              value = psymval->value(object, rela.get_r_addend());
            }
          this->call_tls_get_addr_ = CALL_SKIP;
        }
    }
  else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD)
           || (size == 32 && r_type == elfcpp::R_PPC_TLSLD))
    {
      // Second instruction of a local dynamic sequence,
      // the __tls_get_addr call
      this->call_tls_get_addr_ = CALL_EXPECTED;
      const tls::Tls_optimization tls_type = target->optimize_tls_ld();
      if (tls_type == tls::TLSOPT_TO_LE)
        {
          Insn* iview = reinterpret_cast<Insn*>(view);
          Insn insn = addi_3_3;
          elfcpp::Swap<32, big_endian>::writeval(iview, insn);
          this->call_tls_get_addr_ = CALL_SKIP;
          r_type = elfcpp::R_POWERPC_TPREL16_LO;
          view += 2 * big_endian;
          value = dtp_offset;
        }
    }
  else if (r_type == elfcpp::R_POWERPC_TLS)
    {
      // Second instruction of an initial exec sequence
      const bool final = gsym == NULL || gsym->final_value_is_known();
      const tls::Tls_optimization tls_type = target->optimize_tls_ie(final);
      if (tls_type == tls::TLSOPT_TO_LE)
        {
          Insn* iview = reinterpret_cast<Insn*>(view);
          Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
          unsigned int reg = size == 32 ? 2 : 13;
          insn = at_tls_transform(insn, reg);
          gold_assert(insn != 0);
          elfcpp::Swap<32, big_endian>::writeval(iview, insn);
          r_type = elfcpp::R_POWERPC_TPREL16_LO;
          view += 2 * big_endian;
          value = psymval->value(object, rela.get_r_addend());
        }
    }
  else
    {
      Address addend = 0;
      unsigned int dest_shndx;
      if (r_type != elfcpp::R_PPC_PLTREL24)
        addend = rela.get_r_addend();
      if (size == 64 || !has_plt_value)
        value = psymval->value(object, addend);
      if (size == 64 && is_branch_reloc(r_type))
        value = target->symval_for_branch(value, gsym, object, &dest_shndx);
    }

  switch (r_type)
    {
    case elfcpp::R_PPC64_REL64:
    case elfcpp::R_POWERPC_REL32:
    case elfcpp::R_POWERPC_REL24:
    case elfcpp::R_PPC_PLTREL24:
    case elfcpp::R_PPC_LOCAL24PC:
    case elfcpp::R_POWERPC_REL16:
    case elfcpp::R_POWERPC_REL16_LO:
    case elfcpp::R_POWERPC_REL16_HI:
    case elfcpp::R_POWERPC_REL16_HA:
    case elfcpp::R_POWERPC_REL14:
    case elfcpp::R_POWERPC_REL14_BRTAKEN:
    case elfcpp::R_POWERPC_REL14_BRNTAKEN:
      value -= address;
      break;

    case elfcpp::R_PPC64_TOC16:
    case elfcpp::R_PPC64_TOC16_LO:
    case elfcpp::R_PPC64_TOC16_HI:
    case elfcpp::R_PPC64_TOC16_HA:
    case elfcpp::R_PPC64_TOC16_DS:
    case elfcpp::R_PPC64_TOC16_LO_DS:
      // Subtract the TOC base address.
      value -= (target->got_section()->output_section()->address()
                + object->toc_base_offset());
      break;

    case elfcpp::R_POWERPC_SECTOFF:
    case elfcpp::R_POWERPC_SECTOFF_LO:
    case elfcpp::R_POWERPC_SECTOFF_HI:
    case elfcpp::R_POWERPC_SECTOFF_HA:
    case elfcpp::R_PPC64_SECTOFF_DS:
    case elfcpp::R_PPC64_SECTOFF_LO_DS:
      if (os != NULL)
        value -= os->address();
      break;

    case elfcpp::R_PPC64_TPREL16_DS:
    case elfcpp::R_PPC64_TPREL16_LO_DS:
      if (size != 64)
        // R_PPC_TLSGD and R_PPC_TLSLD
        break;
    case elfcpp::R_POWERPC_TPREL16:
    case elfcpp::R_POWERPC_TPREL16_LO:
    case elfcpp::R_POWERPC_TPREL16_HI:
    case elfcpp::R_POWERPC_TPREL16_HA:
    case elfcpp::R_POWERPC_TPREL:
    case elfcpp::R_PPC64_TPREL16_HIGHER:
    case elfcpp::R_PPC64_TPREL16_HIGHERA:
    case elfcpp::R_PPC64_TPREL16_HIGHEST:
    case elfcpp::R_PPC64_TPREL16_HIGHESTA:
      // tls symbol values are relative to tls_segment()->vaddr()
      value -= tp_offset;
      break;

    case elfcpp::R_PPC64_DTPREL16_DS:
    case elfcpp::R_PPC64_DTPREL16_LO_DS:
    case elfcpp::R_PPC64_DTPREL16_HIGHER:
    case elfcpp::R_PPC64_DTPREL16_HIGHERA:
    case elfcpp::R_PPC64_DTPREL16_HIGHEST:
    case elfcpp::R_PPC64_DTPREL16_HIGHESTA:
      if (size != 64)
        // R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16, R_PPC_EMB_NADDR16_LO
        // R_PPC_EMB_NADDR16_HI, R_PPC_EMB_NADDR16_HA, R_PPC_EMB_SDAI16
        break;
    case elfcpp::R_POWERPC_DTPREL16:
    case elfcpp::R_POWERPC_DTPREL16_LO:
    case elfcpp::R_POWERPC_DTPREL16_HI:
    case elfcpp::R_POWERPC_DTPREL16_HA:
    case elfcpp::R_POWERPC_DTPREL:
      // tls symbol values are relative to tls_segment()->vaddr()
      value -= dtp_offset;
      break;

    default:
      break;
    }

  Insn branch_bit = 0;
  switch (r_type)
    {
    case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
    case elfcpp::R_POWERPC_REL14_BRTAKEN:
      branch_bit = 1 << 21;
    case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
    case elfcpp::R_POWERPC_REL14_BRNTAKEN:
      {
        Insn* iview = reinterpret_cast<Insn*>(view);
        Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
        insn &= ~(1 << 21);
        insn |= branch_bit;
        if (this->is_isa_v2)
          {
            // Set 'a' bit.  This is 0b00010 in BO field for branch
            // on CR(BI) insns (BO == 001at or 011at), and 0b01000
            // for branch on CTR insns (BO == 1a00t or 1a01t).
            if ((insn & (0x14 << 21)) == (0x04 << 21))
              insn |= 0x02 << 21;
            else if ((insn & (0x14 << 21)) == (0x10 << 21))
              insn |= 0x08 << 21;
            else
              break;
          }
        else
          {
            // Invert 'y' bit if not the default.
            if (static_cast<Signed_address>(value) < 0)
              insn ^= 1 << 21;
          }
        elfcpp::Swap<32, big_endian>::writeval(iview, insn);
      }
      break;

    default:
      break;
    }

  typename Reloc::Overflow_check overflow = Reloc::CHECK_NONE;
  switch (r_type)
    {
    case elfcpp::R_POWERPC_ADDR32:
    case elfcpp::R_POWERPC_UADDR32:
      if (size == 64)
        overflow = Reloc::CHECK_BITFIELD;
      break;

    case elfcpp::R_POWERPC_REL32:
      if (size == 64)
        overflow = Reloc::CHECK_SIGNED;
      break;

    case elfcpp::R_POWERPC_ADDR24:
    case elfcpp::R_POWERPC_ADDR16:
    case elfcpp::R_POWERPC_UADDR16:
    case elfcpp::R_PPC64_ADDR16_DS:
    case elfcpp::R_POWERPC_ADDR14:
    case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
    case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
      overflow = Reloc::CHECK_BITFIELD;
      break;

    case elfcpp::R_POWERPC_REL24:
    case elfcpp::R_PPC_PLTREL24:
    case elfcpp::R_PPC_LOCAL24PC:
    case elfcpp::R_POWERPC_REL16:
    case elfcpp::R_PPC64_TOC16:
    case elfcpp::R_POWERPC_GOT16:
    case elfcpp::R_POWERPC_SECTOFF:
    case elfcpp::R_POWERPC_TPREL16:
    case elfcpp::R_POWERPC_DTPREL16:
    case elfcpp::R_PPC64_TPREL16_DS:
    case elfcpp::R_PPC64_DTPREL16_DS:
    case elfcpp::R_PPC64_TOC16_DS:
    case elfcpp::R_PPC64_GOT16_DS:
    case elfcpp::R_PPC64_SECTOFF_DS:
    case elfcpp::R_POWERPC_REL14:
    case elfcpp::R_POWERPC_REL14_BRTAKEN:
    case elfcpp::R_POWERPC_REL14_BRNTAKEN:
    case elfcpp::R_POWERPC_GOT_TLSGD16:
    case elfcpp::R_POWERPC_GOT_TLSLD16:
    case elfcpp::R_POWERPC_GOT_TPREL16:
    case elfcpp::R_POWERPC_GOT_DTPREL16:
      overflow = Reloc::CHECK_SIGNED;
      break;
    }

  typename Powerpc_relocate_functions<size, big_endian>::Status status
    = Powerpc_relocate_functions<size, big_endian>::STATUS_OK;
  switch (r_type)
    {
    case elfcpp::R_POWERPC_NONE:
    case elfcpp::R_POWERPC_TLS:
    case elfcpp::R_POWERPC_GNU_VTINHERIT:
    case elfcpp::R_POWERPC_GNU_VTENTRY:
    case elfcpp::R_PPC_EMB_MRKREF:
      break;

    case elfcpp::R_PPC64_ADDR64:
    case elfcpp::R_PPC64_REL64:
    case elfcpp::R_PPC64_TOC:
      Reloc::addr64(view, value);
      break;

    case elfcpp::R_POWERPC_TPREL:
    case elfcpp::R_POWERPC_DTPREL:
      if (size == 64)
        Reloc::addr64(view, value);
      else
        status = Reloc::addr32(view, value, overflow);
      break;

    case elfcpp::R_PPC64_UADDR64:
      Reloc::addr64_u(view, value);
      break;

    case elfcpp::R_POWERPC_ADDR32:
    case elfcpp::R_POWERPC_REL32:
      status = Reloc::addr32(view, value, overflow);
      break;

    case elfcpp::R_POWERPC_UADDR32:
      status = Reloc::addr32_u(view, value, overflow);
      break;

    case elfcpp::R_POWERPC_ADDR24:
    case elfcpp::R_POWERPC_REL24:
    case elfcpp::R_PPC_PLTREL24:
    case elfcpp::R_PPC_LOCAL24PC:
      status = Reloc::addr24(view, value, overflow);
      break;

    case elfcpp::R_POWERPC_GOT_DTPREL16:
    case elfcpp::R_POWERPC_GOT_DTPREL16_LO:
      if (size == 64)
        {
          status = Reloc::addr16_ds(view, value, overflow);
          break;
        }
    case elfcpp::R_POWERPC_ADDR16:
    case elfcpp::R_POWERPC_REL16:
    case elfcpp::R_PPC64_TOC16:
    case elfcpp::R_POWERPC_GOT16:
    case elfcpp::R_POWERPC_SECTOFF:
    case elfcpp::R_POWERPC_TPREL16:
    case elfcpp::R_POWERPC_DTPREL16:
    case elfcpp::R_POWERPC_GOT_TLSGD16:
    case elfcpp::R_POWERPC_GOT_TLSLD16:
    case elfcpp::R_POWERPC_GOT_TPREL16:
    case elfcpp::R_POWERPC_ADDR16_LO:
    case elfcpp::R_POWERPC_REL16_LO:
    case elfcpp::R_PPC64_TOC16_LO:
    case elfcpp::R_POWERPC_GOT16_LO:
    case elfcpp::R_POWERPC_SECTOFF_LO:
    case elfcpp::R_POWERPC_TPREL16_LO:
    case elfcpp::R_POWERPC_DTPREL16_LO:
    case elfcpp::R_POWERPC_GOT_TLSGD16_LO:
    case elfcpp::R_POWERPC_GOT_TLSLD16_LO:
    case elfcpp::R_POWERPC_GOT_TPREL16_LO:
      status = Reloc::addr16(view, value, overflow);
      break;

    case elfcpp::R_POWERPC_UADDR16:
      status = Reloc::addr16_u(view, value, overflow);
      break;

    case elfcpp::R_POWERPC_ADDR16_HI:
    case elfcpp::R_POWERPC_REL16_HI:
    case elfcpp::R_PPC64_TOC16_HI:
    case elfcpp::R_POWERPC_GOT16_HI:
    case elfcpp::R_POWERPC_SECTOFF_HI:
    case elfcpp::R_POWERPC_TPREL16_HI:
    case elfcpp::R_POWERPC_DTPREL16_HI:
    case elfcpp::R_POWERPC_GOT_TLSGD16_HI:
    case elfcpp::R_POWERPC_GOT_TLSLD16_HI:
    case elfcpp::R_POWERPC_GOT_TPREL16_HI:
    case elfcpp::R_POWERPC_GOT_DTPREL16_HI:
      Reloc::addr16_hi(view, value);
      break;

    case elfcpp::R_POWERPC_ADDR16_HA:
    case elfcpp::R_POWERPC_REL16_HA:
    case elfcpp::R_PPC64_TOC16_HA:
    case elfcpp::R_POWERPC_GOT16_HA:
    case elfcpp::R_POWERPC_SECTOFF_HA:
    case elfcpp::R_POWERPC_TPREL16_HA:
    case elfcpp::R_POWERPC_DTPREL16_HA:
    case elfcpp::R_POWERPC_GOT_TLSGD16_HA:
    case elfcpp::R_POWERPC_GOT_TLSLD16_HA:
    case elfcpp::R_POWERPC_GOT_TPREL16_HA:
    case elfcpp::R_POWERPC_GOT_DTPREL16_HA:
      Reloc::addr16_ha(view, value);
      break;

    case elfcpp::R_PPC64_DTPREL16_HIGHER:
      if (size == 32)
        // R_PPC_EMB_NADDR16_LO
        goto unsupp;
    case elfcpp::R_PPC64_ADDR16_HIGHER:
    case elfcpp::R_PPC64_TPREL16_HIGHER:
      Reloc::addr16_hi2(view, value);
      break;

    case elfcpp::R_PPC64_DTPREL16_HIGHERA:
      if (size == 32)
        // R_PPC_EMB_NADDR16_HI
        goto unsupp;
    case elfcpp::R_PPC64_ADDR16_HIGHERA:
    case elfcpp::R_PPC64_TPREL16_HIGHERA:
      Reloc::addr16_ha2(view, value);
      break;

    case elfcpp::R_PPC64_DTPREL16_HIGHEST:
      if (size == 32)
        // R_PPC_EMB_NADDR16_HA
        goto unsupp;
    case elfcpp::R_PPC64_ADDR16_HIGHEST:
    case elfcpp::R_PPC64_TPREL16_HIGHEST:
      Reloc::addr16_hi3(view, value);
      break;

    case elfcpp::R_PPC64_DTPREL16_HIGHESTA:
      if (size == 32)
        // R_PPC_EMB_SDAI16
        goto unsupp;
    case elfcpp::R_PPC64_ADDR16_HIGHESTA:
    case elfcpp::R_PPC64_TPREL16_HIGHESTA:
      Reloc::addr16_ha3(view, value);
      break;

    case elfcpp::R_PPC64_DTPREL16_DS:
    case elfcpp::R_PPC64_DTPREL16_LO_DS:
      if (size == 32)
        // R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16
        goto unsupp;
    case elfcpp::R_PPC64_TPREL16_DS:
    case elfcpp::R_PPC64_TPREL16_LO_DS:
      if (size == 32)
        // R_PPC_TLSGD, R_PPC_TLSLD
        break;
    case elfcpp::R_PPC64_ADDR16_DS:
    case elfcpp::R_PPC64_ADDR16_LO_DS:
    case elfcpp::R_PPC64_TOC16_DS:
    case elfcpp::R_PPC64_TOC16_LO_DS:
    case elfcpp::R_PPC64_GOT16_DS:
    case elfcpp::R_PPC64_GOT16_LO_DS:
    case elfcpp::R_PPC64_SECTOFF_DS:
    case elfcpp::R_PPC64_SECTOFF_LO_DS:
      status = Reloc::addr16_ds(view, value, overflow);
      break;

    case elfcpp::R_POWERPC_ADDR14:
    case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
    case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
    case elfcpp::R_POWERPC_REL14:
    case elfcpp::R_POWERPC_REL14_BRTAKEN:
    case elfcpp::R_POWERPC_REL14_BRNTAKEN:
      status = Reloc::addr14(view, value, overflow);
      break;

    case elfcpp::R_POWERPC_COPY:
    case elfcpp::R_POWERPC_GLOB_DAT:
    case elfcpp::R_POWERPC_JMP_SLOT:
    case elfcpp::R_POWERPC_RELATIVE:
    case elfcpp::R_POWERPC_DTPMOD:
    case elfcpp::R_PPC64_JMP_IREL:
    case elfcpp::R_POWERPC_IRELATIVE:
      gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
                             _("unexpected reloc %u in object file"),
                             r_type);
      break;

    case elfcpp::R_PPC_EMB_SDA21:
      if (size == 32)
        goto unsupp;
      else
        {
          // R_PPC64_TOCSAVE.  For the time being this can be ignored.
        }
      break;

    case elfcpp::R_PPC_EMB_SDA2I16:
    case elfcpp::R_PPC_EMB_SDA2REL:
      if (size == 32)
        goto unsupp;
      // R_PPC64_TLSGD, R_PPC64_TLSLD
      break;

    case elfcpp::R_POWERPC_PLT32:
    case elfcpp::R_POWERPC_PLTREL32:
    case elfcpp::R_POWERPC_PLT16_LO:
    case elfcpp::R_POWERPC_PLT16_HI:
    case elfcpp::R_POWERPC_PLT16_HA:
    case elfcpp::R_PPC_SDAREL16:
    case elfcpp::R_POWERPC_ADDR30:
    case elfcpp::R_PPC64_PLT64:
    case elfcpp::R_PPC64_PLTREL64:
    case elfcpp::R_PPC64_PLTGOT16:
    case elfcpp::R_PPC64_PLTGOT16_LO:
    case elfcpp::R_PPC64_PLTGOT16_HI:
    case elfcpp::R_PPC64_PLTGOT16_HA:
    case elfcpp::R_PPC64_PLT16_LO_DS:
    case elfcpp::R_PPC64_PLTGOT16_DS:
    case elfcpp::R_PPC64_PLTGOT16_LO_DS:
    case elfcpp::R_PPC_EMB_RELSEC16:
    case elfcpp::R_PPC_EMB_RELST_LO:
    case elfcpp::R_PPC_EMB_RELST_HI:
    case elfcpp::R_PPC_EMB_RELST_HA:
    case elfcpp::R_PPC_EMB_BIT_FLD:
    case elfcpp::R_PPC_EMB_RELSDA:
    case elfcpp::R_PPC_TOC16:
    default:
    unsupp:
      gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
                             _("unsupported reloc %u"),
                             r_type);
      break;
    }
  if (status != Powerpc_relocate_functions<size, big_endian>::STATUS_OK)
    gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
                           _("relocation overflow"));

  return true;
}

// Relocate section data.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::relocate_section(
    const Relocate_info<size, big_endian>* relinfo,
    unsigned int sh_type,
    const unsigned char* prelocs,
    size_t reloc_count,
    Output_section* output_section,
    bool needs_special_offset_handling,
    unsigned char* view,
    Address address,
    section_size_type view_size,
    const Reloc_symbol_changes* reloc_symbol_changes)
{
  typedef Target_powerpc<size, big_endian> Powerpc;
  typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate;

  gold_assert(sh_type == elfcpp::SHT_RELA);

  gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA,
                         Powerpc_relocate>(
    relinfo,
    this,
    prelocs,
    reloc_count,
    output_section,
    needs_special_offset_handling,
    view,
    address,
    view_size,
    reloc_symbol_changes);
}

class Powerpc_scan_relocatable_reloc
{
public:
  // Return the strategy to use for a local symbol which is not a
  // section symbol, given the relocation type.
  inline Relocatable_relocs::Reloc_strategy
  local_non_section_strategy(unsigned int r_type, Relobj*, unsigned int r_sym)
  {
    if (r_type == 0 && r_sym == 0)
      return Relocatable_relocs::RELOC_DISCARD;
    return Relocatable_relocs::RELOC_COPY;
  }

  // Return the strategy to use for a local symbol which is a section
  // symbol, given the relocation type.
  inline Relocatable_relocs::Reloc_strategy
  local_section_strategy(unsigned int, Relobj*)
  {
    return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA;
  }

  // Return the strategy to use for a global symbol, given the
  // relocation type, the object, and the symbol index.
  inline Relocatable_relocs::Reloc_strategy
  global_strategy(unsigned int r_type, Relobj*, unsigned int)
  {
    if (r_type == elfcpp::R_PPC_PLTREL24)
      return Relocatable_relocs::RELOC_SPECIAL;
    return Relocatable_relocs::RELOC_COPY;
  }
};

// Scan the relocs during a relocatable link.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::scan_relocatable_relocs(
    Symbol_table* symtab,
    Layout* layout,
    Sized_relobj_file<size, big_endian>* object,
    unsigned int data_shndx,
    unsigned int sh_type,
    const unsigned char* prelocs,
    size_t reloc_count,
    Output_section* output_section,
    bool needs_special_offset_handling,
    size_t local_symbol_count,
    const unsigned char* plocal_symbols,
    Relocatable_relocs* rr)
{
  gold_assert(sh_type == elfcpp::SHT_RELA);

  gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA,
                                Powerpc_scan_relocatable_reloc>(
    symtab,
    layout,
    object,
    data_shndx,
    prelocs,
    reloc_count,
    output_section,
    needs_special_offset_handling,
    local_symbol_count,
    plocal_symbols,
    rr);
}

// Emit relocations for a section.
// This is a modified version of the function by the same name in
// target-reloc.h.  Using relocate_special_relocatable for
// R_PPC_PLTREL24 would require duplication of the entire body of the
// loop, so we may as well duplicate the whole thing.

template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::relocate_relocs(
    const Relocate_info<size, big_endian>* relinfo,
    unsigned int sh_type,
    const unsigned char* prelocs,
    size_t reloc_count,
    Output_section* output_section,
    off_t offset_in_output_section,
    const Relocatable_relocs* rr,
    unsigned char*,
    Address view_address,
    section_size_type,
    unsigned char* reloc_view,
    section_size_type reloc_view_size)
{
  gold_assert(sh_type == elfcpp::SHT_RELA);

  typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc
    Reltype;
  typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc_write
    Reltype_write;
  const int reloc_size
    = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size;

  Powerpc_relobj<size, big_endian>* const object
    = static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object);
  const unsigned int local_count = object->local_symbol_count();
  unsigned int got2_shndx = object->got2_shndx();
  Address got2_addend = 0;
  if (got2_shndx != 0)
    {
      got2_addend = object->get_output_section_offset(got2_shndx);
      gold_assert(got2_addend != invalid_address);
    }

  unsigned char* pwrite = reloc_view;
  bool zap_next = false;
  for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
    {
      Relocatable_relocs::Reloc_strategy strategy = rr->strategy(i);
      if (strategy == Relocatable_relocs::RELOC_DISCARD)
        continue;

      Reltype reloc(prelocs);
      Reltype_write reloc_write(pwrite);

      Address offset = reloc.get_r_offset();
      typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
      unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
      unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
      const unsigned int orig_r_sym = r_sym;
      typename elfcpp::Elf_types<size>::Elf_Swxword addend
        = reloc.get_r_addend();
      const Symbol* gsym = NULL;

      if (zap_next)
        {
          // We could arrange to discard these and other relocs for
          // tls optimised sequences in the strategy methods, but for
          // now do as BFD ld does.
          r_type = elfcpp::R_POWERPC_NONE;
          zap_next = false;
        }

      // Get the new symbol index.
      if (r_sym < local_count)
        {
          switch (strategy)
            {
            case Relocatable_relocs::RELOC_COPY:
            case Relocatable_relocs::RELOC_SPECIAL:
              if (r_sym != 0)
                {
                  r_sym = object->symtab_index(r_sym);
                  gold_assert(r_sym != -1U);
                }
              break;

            case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA:
              {
                // We are adjusting a section symbol.  We need to find
                // the symbol table index of the section symbol for
                // the output section corresponding to input section
                // in which this symbol is defined.
                gold_assert(r_sym < local_count);
                bool is_ordinary;
                unsigned int shndx =
                  object->local_symbol_input_shndx(r_sym, &is_ordinary);
                gold_assert(is_ordinary);
                Output_section* os = object->output_section(shndx);
                gold_assert(os != NULL);
                gold_assert(os->needs_symtab_index());
                r_sym = os->symtab_index();
              }
              break;

            default:
              gold_unreachable();
            }
        }
      else
        {
          gsym = object->global_symbol(r_sym);
          gold_assert(gsym != NULL);
          if (gsym->is_forwarder())
            gsym = relinfo->symtab->resolve_forwards(gsym);

          gold_assert(gsym->has_symtab_index());
          r_sym = gsym->symtab_index();
        }

      // Get the new offset--the location in the output section where
      // this relocation should be applied.
      if (static_cast<Address>(offset_in_output_section) != invalid_address)
        offset += offset_in_output_section;
      else
        {
          section_offset_type sot_offset =
            convert_types<section_offset_type, Address>(offset);
          section_offset_type new_sot_offset =
            output_section->output_offset(object, relinfo->data_shndx,
                                          sot_offset);
          gold_assert(new_sot_offset != -1);
          offset = new_sot_offset;
        }

      // In an object file, r_offset is an offset within the section.
      // In an executable or dynamic object, generated by
      // --emit-relocs, r_offset is an absolute address.
      if (!parameters->options().relocatable())
        {
          offset += view_address;
          if (static_cast<Address>(offset_in_output_section) != invalid_address)
            offset -= offset_in_output_section;
        }

      // Handle the reloc addend based on the strategy.
      if (strategy == Relocatable_relocs::RELOC_COPY)
        ;
      else if (strategy == Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA)
        {
          const Symbol_value<size>* psymval = object->local_symbol(orig_r_sym);
          addend = psymval->value(object, addend);
        }
      else if (strategy == Relocatable_relocs::RELOC_SPECIAL)
        {
          if (addend >= 32768)
            addend += got2_addend;
        }
      else
        gold_unreachable();

      if (!parameters->options().relocatable())
        {
          if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16
              || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO
              || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI
              || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA)
            {
              // First instruction of a global dynamic sequence,
              // arg setup insn.
              const bool final = gsym == NULL || gsym->final_value_is_known();
              switch (this->optimize_tls_gd(final))
                {
                case tls::TLSOPT_TO_IE:
                  r_type += (elfcpp::R_POWERPC_GOT_TPREL16
                             - elfcpp::R_POWERPC_GOT_TLSGD16);
                  break;
                case tls::TLSOPT_TO_LE:
                  if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16
                      || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO)
                    r_type = elfcpp::R_POWERPC_TPREL16_HA;
                  else
                    {
                      r_type = elfcpp::R_POWERPC_NONE;
                      offset -= 2 * big_endian;
                    }
                  break;
                default:
                  break;
                }
            }
          else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16
                   || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO
                   || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI
                   || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA)
            {
              // First instruction of a local dynamic sequence,
              // arg setup insn.
              if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE)
                {
                  if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16
                      || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO)
                    {
                      r_type = elfcpp::R_POWERPC_TPREL16_HA;
                      const Output_section* os = relinfo->layout->tls_segment()
                        ->first_section();
                      gold_assert(os != NULL);
                      gold_assert(os->needs_symtab_index());
                      r_sym = os->symtab_index();
                      addend = dtp_offset;
                    }
                  else
                    {
                      r_type = elfcpp::R_POWERPC_NONE;
                      offset -= 2 * big_endian;
                    }
                }
            }
          else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16
                   || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO
                   || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI
                   || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA)
            {
              // First instruction of initial exec sequence.
              const bool final = gsym == NULL || gsym->final_value_is_known();
              if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE)
                {
                  if (r_type == elfcpp::R_POWERPC_GOT_TPREL16
                      || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO)
                    r_type = elfcpp::R_POWERPC_TPREL16_HA;
                  else
                    {
                      r_type = elfcpp::R_POWERPC_NONE;
                      offset -= 2 * big_endian;
                    }
                }
            }
          else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD)
                   || (size == 32 && r_type == elfcpp::R_PPC_TLSGD))
            {
              // Second instruction of a global dynamic sequence,
              // the __tls_get_addr call
              const bool final = gsym == NULL || gsym->final_value_is_known();
              switch (this->optimize_tls_gd(final))
                {
                case tls::TLSOPT_TO_IE:
                  r_type = elfcpp::R_POWERPC_NONE;
                  zap_next = true;
                  break;
                case tls::TLSOPT_TO_LE:
                  r_type = elfcpp::R_POWERPC_TPREL16_LO;
                  offset += 2 * big_endian;
                  zap_next = true;
                  break;
                default:
                  break;
                }
            }
          else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD)
                   || (size == 32 && r_type == elfcpp::R_PPC_TLSLD))
            {
              // Second instruction of a local dynamic sequence,
              // the __tls_get_addr call
              if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE)
                {
                  const Output_section* os = relinfo->layout->tls_segment()
                    ->first_section();
                  gold_assert(os != NULL);
                  gold_assert(os->needs_symtab_index());
                  r_sym = os->symtab_index();
                  addend = dtp_offset;
                  r_type = elfcpp::R_POWERPC_TPREL16_LO;
                  offset += 2 * big_endian;
                  zap_next = true;
                }
            }
          else if (r_type == elfcpp::R_POWERPC_TLS)
            {
              // Second instruction of an initial exec sequence
              const bool final = gsym == NULL || gsym->final_value_is_known();
              if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE)
                {
                  r_type = elfcpp::R_POWERPC_TPREL16_LO;
                  offset += 2 * big_endian;
                }
            }
        }

      reloc_write.put_r_offset(offset);
      reloc_write.put_r_info(elfcpp::elf_r_info<size>(r_sym, r_type));
      reloc_write.put_r_addend(addend);

      pwrite += reloc_size;
    }

  gold_assert(static_cast<section_size_type>(pwrite - reloc_view)
              == reloc_view_size);
}

// Return the value to use for a dynamic which requires special
// treatment.  This is how we support equality comparisons of function
// pointers across shared library boundaries, as described in the
// processor specific ABI supplement.

template<int size, bool big_endian>
uint64_t
Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
{
  if (size == 32)
    {
      gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
      return this->plt_section()->address() + gsym->plt_offset();
    }
  else
    gold_unreachable();
}

// The selector for powerpc object files.

template<int size, bool big_endian>
class Target_selector_powerpc : public Target_selector
{
public:
  Target_selector_powerpc()
    : Target_selector(elfcpp::EM_NONE, size, big_endian,
                      (size == 64
                       ? (big_endian ? "elf64-powerpc" : "elf64-powerpcle")
                       : (big_endian ? "elf32-powerpc" : "elf32-powerpcle")),
                      (size == 64
                       ? (big_endian ? "elf64ppc" : "elf64lppc")
                       : (big_endian ? "elf32ppc" : "elf32lppc")))
  { }

  virtual Target*
  do_recognize(Input_file*, off_t, int machine, int, int)
  {
    switch (size)
      {
      case 64:
        if (machine != elfcpp::EM_PPC64)
          return NULL;
        break;

      case 32:
        if (machine != elfcpp::EM_PPC)
          return NULL;
        break;

      default:
        return NULL;
      }

    return this->instantiate_target();
  }

  virtual Target*
  do_instantiate_target()
  { return new Target_powerpc<size, big_endian>(); }
};

Target_selector_powerpc<32, true> target_selector_ppc32;
Target_selector_powerpc<32, false> target_selector_ppc32le;
Target_selector_powerpc<64, true> target_selector_ppc64;
Target_selector_powerpc<64, false> target_selector_ppc64le;

} // End anonymous namespace.