gold/
[external/binutils.git] / gold / output.cc
index 7633c73..b47ad4d 100644 (file)
@@ -1,6 +1,7 @@
 // output.cc -- manage the output file for gold
 
-// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012
+// Free Software Foundation, Inc.
 // Written by Ian Lance Taylor <iant@google.com>.
 
 // This file is part of gold.
@@ -111,20 +112,6 @@ extern "C" void *gold_mremap(void *, size_t, size_t, int);
 # define MREMAP_MAYMOVE 1
 #endif
 
-#ifndef HAVE_POSIX_FALLOCATE
-// A dummy, non general, version of posix_fallocate.  Here we just set
-// the file size and hope that there is enough disk space.  FIXME: We
-// could allocate disk space by walking block by block and writing a
-// zero byte into each block.
-static int
-posix_fallocate(int o, off_t offset, off_t len)
-{
-  if (ftruncate(o, offset + len) < 0)
-    return errno;
-  return 0;
-}
-#endif // !defined(HAVE_POSIX_FALLOCATE)
-
 // Mingw does not have S_ISLNK.
 #ifndef S_ISLNK
 # define S_ISLNK(mode) 0
@@ -133,6 +120,27 @@ posix_fallocate(int o, off_t offset, off_t len)
 namespace gold
 {
 
+// A wrapper around posix_fallocate.  If we don't have posix_fallocate,
+// or the --no-posix-fallocate option is set, we try the fallocate
+// system call directly.  If that fails, we use ftruncate to set
+// the file size and hope that there is enough disk space.
+
+static int
+gold_fallocate(int o, off_t offset, off_t len)
+{
+#ifdef HAVE_POSIX_FALLOCATE
+  if (parameters->options().posix_fallocate())
+    return ::posix_fallocate(o, offset, len);
+#endif // defined(HAVE_POSIX_FALLOCATE)
+#ifdef HAVE_FALLOCATE
+  if (::fallocate(o, 0, offset, len) == 0)
+    return 0;
+#endif // defined(HAVE_FALLOCATE)
+  if (::ftruncate(o, offset + len) < 0)
+    return errno;
+  return 0;
+}
+
 // Output_data variables.
 
 bool Output_data::allocated_sizes_are_fixed;
@@ -705,10 +713,11 @@ Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
     Output_data* od,
     Address address,
     bool is_relative,
-    bool is_symbolless)
+    bool is_symbolless,
+    bool use_plt_offset)
   : address_(address), local_sym_index_(GSYM_CODE), type_(type),
     is_relative_(is_relative), is_symbolless_(is_symbolless),
-    is_section_symbol_(false), use_plt_offset_(false), shndx_(INVALID_CODE)
+    is_section_symbol_(false), use_plt_offset_(use_plt_offset), shndx_(INVALID_CODE)
 {
   // this->type_ is a bitfield; make sure TYPE fits.
   gold_assert(this->type_ == type);
@@ -726,10 +735,11 @@ Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
     unsigned int shndx,
     Address address,
     bool is_relative,
-    bool is_symbolless)
+    bool is_symbolless,
+    bool use_plt_offset)
   : address_(address), local_sym_index_(GSYM_CODE), type_(type),
     is_relative_(is_relative), is_symbolless_(is_symbolless),
-    is_section_symbol_(false), use_plt_offset_(false), shndx_(shndx)
+    is_section_symbol_(false), use_plt_offset_(use_plt_offset), shndx_(shndx)
 {
   gold_assert(shndx != INVALID_CODE);
   // this->type_ is a bitfield; make sure TYPE fits.
@@ -802,9 +812,10 @@ Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
     Output_section* os,
     unsigned int type,
     Output_data* od,
-    Address address)
+    Address address,
+    bool is_relative)
   : address_(address), local_sym_index_(SECTION_CODE), type_(type),
-    is_relative_(false), is_symbolless_(false),
+    is_relative_(is_relative), is_symbolless_(is_relative),
     is_section_symbol_(true), use_plt_offset_(false), shndx_(INVALID_CODE)
 {
   // this->type_ is a bitfield; make sure TYPE fits.
@@ -823,9 +834,10 @@ Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
     unsigned int type,
     Sized_relobj<size, big_endian>* relobj,
     unsigned int shndx,
-    Address address)
+    Address address,
+    bool is_relative)
   : address_(address), local_sym_index_(SECTION_CODE), type_(type),
-    is_relative_(false), is_symbolless_(false),
+    is_relative_(is_relative), is_symbolless_(is_relative),
     is_section_symbol_(true), use_plt_offset_(false), shndx_(shndx)
 {
   gold_assert(shndx != INVALID_CODE);
@@ -1116,10 +1128,17 @@ Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::symbol_value(
     {
       const Sized_symbol<size>* sym;
       sym = static_cast<const Sized_symbol<size>*>(this->u1_.gsym);
-      return sym->value() + addend;
+      if (this->use_plt_offset_ && sym->has_plt_offset())
+       return parameters->target().plt_address_for_global(sym);
+      else
+       return sym->value() + addend;
     }
-  gold_assert(this->local_sym_index_ != SECTION_CODE
-             && this->local_sym_index_ != TARGET_CODE
+  if (this->local_sym_index_ == SECTION_CODE)
+    {
+      gold_assert(!this->use_plt_offset_);
+      return this->u1_.os->address() + addend;
+    }
+  gold_assert(this->local_sym_index_ != TARGET_CODE
               && this->local_sym_index_ != INVALID_CODE
              && this->local_sym_index_ != 0
               && !this->is_section_symbol_);
@@ -1128,11 +1147,7 @@ Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::symbol_value(
       this->u1_.relobj->sized_relobj();
   gold_assert(relobj != NULL);
   if (this->use_plt_offset_)
-    {
-      uint64_t plt_address =
-         parameters->target().plt_address_for_local(relobj, lsi);
-      return plt_address + relobj->local_plt_offset(lsi);
-    }
+    return parameters->target().plt_address_for_local(relobj, lsi);
   const Symbol_value<size>* symval = relobj->local_symbol(lsi);
   return symval->value(relobj, addend);
 }
@@ -1345,9 +1360,11 @@ Output_data_group<size, big_endian>::do_write(Output_file* of)
 
 // Write out the entry.
 
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 void
-Output_data_got<size, big_endian>::Got_entry::write(unsigned char* pov) const
+Output_data_got<got_size, big_endian>::Got_entry::write(
+    unsigned int got_indx,
+    unsigned char* pov) const
 {
   Valtype val = 0;
 
@@ -1359,17 +1376,42 @@ Output_data_got<size, big_endian>::Got_entry::write(unsigned char* pov) const
        // link-time value, which will be relocated dynamically by a
        // RELATIVE relocation.
        Symbol* gsym = this->u_.gsym;
-       if (this->use_plt_offset_ && gsym->has_plt_offset())
-         val = (parameters->target().plt_address_for_global(gsym)
-                + gsym->plt_offset());
+       if (this->use_plt_or_tls_offset_ && gsym->has_plt_offset())
+         val = parameters->target().plt_address_for_global(gsym);
        else
          {
-           Sized_symbol<size>* sgsym;
-           // This cast is a bit ugly.  We don't want to put a
-           // virtual method in Symbol, because we want Symbol to be
-           // as small as possible.
-           sgsym = static_cast<Sized_symbol<size>*>(gsym);
-           val = sgsym->value();
+           switch (parameters->size_and_endianness())
+             {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+             case Parameters::TARGET_32_LITTLE:
+             case Parameters::TARGET_32_BIG:
+               {
+                 // This cast is ugly.  We don't want to put a
+                 // virtual method in Symbol, because we want Symbol
+                 // to be as small as possible.
+                 Sized_symbol<32>::Value_type v;
+                 v = static_cast<Sized_symbol<32>*>(gsym)->value();
+                 val = convert_types<Valtype, Sized_symbol<32>::Value_type>(v);
+               }
+               break;
+#endif
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+             case Parameters::TARGET_64_LITTLE:
+             case Parameters::TARGET_64_BIG:
+               {
+                 Sized_symbol<64>::Value_type v;
+                 v = static_cast<Sized_symbol<64>*>(gsym)->value();
+                 val = convert_types<Valtype, Sized_symbol<64>::Value_type>(v);
+               }
+               break;
+#endif
+             default:
+               gold_unreachable();
+             }
+           if (this->use_plt_or_tls_offset_
+               && gsym->type() == elfcpp::STT_TLS)
+             val += parameters->target().tls_offset_for_global(gsym,
+                                                               got_indx);
          }
       }
       break;
@@ -1387,22 +1429,24 @@ Output_data_got<size, big_endian>::Got_entry::write(unsigned char* pov) const
 
     default:
       {
-       const Sized_relobj_file<size, big_endian>* object = this->u_.object;
+       const Relobj* object = this->u_.object;
         const unsigned int lsi = this->local_sym_index_;
-        const Symbol_value<size>* symval = object->local_symbol(lsi);
-       if (!this->use_plt_offset_)
-         val = symval->value(this->u_.object, 0);
+       bool is_tls = object->local_is_tls(lsi);
+       if (this->use_plt_or_tls_offset_ && !is_tls)
+         val = parameters->target().plt_address_for_local(object, lsi);
        else
          {
-           uint64_t plt_address =
-             parameters->target().plt_address_for_local(object, lsi);
-           val = plt_address + object->local_plt_offset(lsi);
+           uint64_t lval = object->local_symbol_value(lsi, 0);
+           val = convert_types<Valtype, uint64_t>(lval);
+           if (this->use_plt_or_tls_offset_ && is_tls)
+             val += parameters->target().tls_offset_for_local(object, lsi,
+                                                              got_indx);
          }
       }
       break;
     }
 
-  elfcpp::Swap<size, big_endian>::writeval(pov, val);
+  elfcpp::Swap<got_size, big_endian>::writeval(pov, val);
 }
 
 // Output_data_got methods.
@@ -1411,9 +1455,9 @@ Output_data_got<size, big_endian>::Got_entry::write(unsigned char* pov) const
 // this is a new GOT entry, false if the symbol already had a GOT
 // entry.
 
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 bool
-Output_data_got<size, big_endian>::add_global(
+Output_data_got<got_size, big_endian>::add_global(
     Symbol* gsym,
     unsigned int got_type)
 {
@@ -1427,10 +1471,10 @@ Output_data_got<size, big_endian>::add_global(
 
 // Like add_global, but use the PLT offset.
 
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 bool
-Output_data_got<size, big_endian>::add_global_plt(Symbol* gsym,
-                                                 unsigned int got_type)
+Output_data_got<got_size, big_endian>::add_global_plt(Symbol* gsym,
+                                                     unsigned int got_type)
 {
   if (gsym->has_got_offset(got_type))
     return false;
@@ -1443,28 +1487,12 @@ Output_data_got<size, big_endian>::add_global_plt(Symbol* gsym,
 // Add an entry for a global symbol to the GOT, and add a dynamic
 // relocation of type R_TYPE for the GOT entry.
 
-template<int size, bool big_endian>
-void
-Output_data_got<size, big_endian>::add_global_with_rel(
-    Symbol* gsym,
-    unsigned int got_type,
-    Rel_dyn* rel_dyn,
-    unsigned int r_type)
-{
-  if (gsym->has_got_offset(got_type))
-    return;
-
-  unsigned int got_offset = this->add_got_entry(Got_entry());
-  gsym->set_got_offset(got_type, got_offset);
-  rel_dyn->add_global(gsym, r_type, this, got_offset);
-}
-
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 void
-Output_data_got<size, big_endian>::add_global_with_rela(
+Output_data_got<got_size, big_endian>::add_global_with_rel(
     Symbol* gsym,
     unsigned int got_type,
-    Rela_dyn* rela_dyn,
+    Output_data_reloc_generic* rel_dyn,
     unsigned int r_type)
 {
   if (gsym->has_got_offset(got_type))
@@ -1472,38 +1500,18 @@ Output_data_got<size, big_endian>::add_global_with_rela(
 
   unsigned int got_offset = this->add_got_entry(Got_entry());
   gsym->set_got_offset(got_type, got_offset);
-  rela_dyn->add_global(gsym, r_type, this, got_offset, 0);
+  rel_dyn->add_global_generic(gsym, r_type, this, got_offset, 0);
 }
 
 // Add a pair of entries for a global symbol to the GOT, and add
 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
 // If R_TYPE_2 == 0, add the second entry with no relocation.
-template<int size, bool big_endian>
-void
-Output_data_got<size, big_endian>::add_global_pair_with_rel(
-    Symbol* gsym,
-    unsigned int got_type,
-    Rel_dyn* rel_dyn,
-    unsigned int r_type_1,
-    unsigned int r_type_2)
-{
-  if (gsym->has_got_offset(got_type))
-    return;
-
-  unsigned int got_offset = this->add_got_entry_pair(Got_entry(), Got_entry());
-  gsym->set_got_offset(got_type, got_offset);
-  rel_dyn->add_global(gsym, r_type_1, this, got_offset);
-
-  if (r_type_2 != 0)
-    rel_dyn->add_global(gsym, r_type_2, this, got_offset + size / 8);
-}
-
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 void
-Output_data_got<size, big_endian>::add_global_pair_with_rela(
+Output_data_got<got_size, big_endian>::add_global_pair_with_rel(
     Symbol* gsym,
     unsigned int got_type,
-    Rela_dyn* rela_dyn,
+    Output_data_reloc_generic* rel_dyn,
     unsigned int r_type_1,
     unsigned int r_type_2)
 {
@@ -1512,20 +1520,21 @@ Output_data_got<size, big_endian>::add_global_pair_with_rela(
 
   unsigned int got_offset = this->add_got_entry_pair(Got_entry(), Got_entry());
   gsym->set_got_offset(got_type, got_offset);
-  rela_dyn->add_global(gsym, r_type_1, this, got_offset, 0);
+  rel_dyn->add_global_generic(gsym, r_type_1, this, got_offset, 0);
 
   if (r_type_2 != 0)
-    rela_dyn->add_global(gsym, r_type_2, this, got_offset + size / 8, 0);
+    rel_dyn->add_global_generic(gsym, r_type_2, this,
+                               got_offset + got_size / 8, 0);
 }
 
 // Add an entry for a local symbol to the GOT.  This returns true if
 // this is a new GOT entry, false if the symbol already has a GOT
 // entry.
 
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 bool
-Output_data_got<size, big_endian>::add_local(
-    Sized_relobj_file<size, big_endian>* object,
+Output_data_got<got_size, big_endian>::add_local(
+    Relobj* object,
     unsigned int symndx,
     unsigned int got_type)
 {
@@ -1540,10 +1549,10 @@ Output_data_got<size, big_endian>::add_local(
 
 // Like add_local, but use the PLT offset.
 
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 bool
-Output_data_got<size, big_endian>::add_local_plt(
-    Sized_relobj_file<size, big_endian>* object,
+Output_data_got<got_size, big_endian>::add_local_plt(
+    Relobj* object,
     unsigned int symndx,
     unsigned int got_type)
 {
@@ -1559,30 +1568,13 @@ Output_data_got<size, big_endian>::add_local_plt(
 // Add an entry for a local symbol to the GOT, and add a dynamic
 // relocation of type R_TYPE for the GOT entry.
 
-template<int size, bool big_endian>
-void
-Output_data_got<size, big_endian>::add_local_with_rel(
-    Sized_relobj_file<size, big_endian>* object,
-    unsigned int symndx,
-    unsigned int got_type,
-    Rel_dyn* rel_dyn,
-    unsigned int r_type)
-{
-  if (object->local_has_got_offset(symndx, got_type))
-    return;
-
-  unsigned int got_offset = this->add_got_entry(Got_entry());
-  object->set_local_got_offset(symndx, got_type, got_offset);
-  rel_dyn->add_local(object, symndx, r_type, this, got_offset);
-}
-
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 void
-Output_data_got<size, big_endian>::add_local_with_rela(
-    Sized_relobj_file<size, big_endian>* object,
+Output_data_got<got_size, big_endian>::add_local_with_rel(
+    Relobj* object,
     unsigned int symndx,
     unsigned int got_type,
-    Rela_dyn* rela_dyn,
+    Output_data_reloc_generic* rel_dyn,
     unsigned int r_type)
 {
   if (object->local_has_got_offset(symndx, got_type))
@@ -1590,22 +1582,23 @@ Output_data_got<size, big_endian>::add_local_with_rela(
 
   unsigned int got_offset = this->add_got_entry(Got_entry());
   object->set_local_got_offset(symndx, got_type, got_offset);
-  rela_dyn->add_local(object, symndx, r_type, this, got_offset, 0);
+  rel_dyn->add_local_generic(object, symndx, r_type, this, got_offset, 0);
 }
 
 // Add a pair of entries for a local symbol to the GOT, and add
-// dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
-// If R_TYPE_2 == 0, add the second entry with no relocation.
-template<int size, bool big_endian>
+// a dynamic relocation of type R_TYPE using the section symbol of
+// the output section to which input section SHNDX maps, on the first.
+// The first got entry will have a value of zero, the second the
+// value of the local symbol.
+template<int got_size, bool big_endian>
 void
-Output_data_got<size, big_endian>::add_local_pair_with_rel(
-    Sized_relobj_file<size, big_endian>* object,
+Output_data_got<got_size, big_endian>::add_local_pair_with_rel(
+    Relobj* object,
     unsigned int symndx,
     unsigned int shndx,
     unsigned int got_type,
-    Rel_dyn* rel_dyn,
-    unsigned int r_type_1,
-    unsigned int r_type_2)
+    Output_data_reloc_generic* rel_dyn,
+    unsigned int r_type)
 {
   if (object->local_has_got_offset(symndx, got_type))
     return;
@@ -1615,82 +1608,75 @@ Output_data_got<size, big_endian>::add_local_pair_with_rel(
                               Got_entry(object, symndx, false));
   object->set_local_got_offset(symndx, got_type, got_offset);
   Output_section* os = object->output_section(shndx);
-  rel_dyn->add_output_section(os, r_type_1, this, got_offset);
-
-  if (r_type_2 != 0)
-    rel_dyn->add_output_section(os, r_type_2, this, got_offset + size / 8);
+  rel_dyn->add_output_section_generic(os, r_type, this, got_offset, 0);
 }
 
-template<int size, bool big_endian>
+// Add a pair of entries for a local symbol to the GOT, and add
+// a dynamic relocation of type R_TYPE using STN_UNDEF on the first.
+// The first got entry will have a value of zero, the second the
+// value of the local symbol offset by Target::tls_offset_for_local.
+template<int got_size, bool big_endian>
 void
-Output_data_got<size, big_endian>::add_local_pair_with_rela(
-    Sized_relobj_file<size, big_endian>* object,
+Output_data_got<got_size, big_endian>::add_local_tls_pair(
+    Relobj* object,
     unsigned int symndx,
-    unsigned int shndx,
     unsigned int got_type,
-    Rela_dyn* rela_dyn,
-    unsigned int r_type_1,
-    unsigned int r_type_2)
+    Output_data_reloc_generic* rel_dyn,
+    unsigned int r_type)
 {
   if (object->local_has_got_offset(symndx, got_type))
     return;
 
-  unsigned int got_offset =
-      this->add_got_entry_pair(Got_entry(),
-                              Got_entry(object, symndx, false));
+  unsigned int got_offset
+    = this->add_got_entry_pair(Got_entry(),
+                              Got_entry(object, symndx, true));
   object->set_local_got_offset(symndx, got_type, got_offset);
-  Output_section* os = object->output_section(shndx);
-  rela_dyn->add_output_section(os, r_type_1, this, got_offset, 0);
-
-  if (r_type_2 != 0)
-    rela_dyn->add_output_section(os, r_type_2, this, got_offset + size / 8, 0);
+  rel_dyn->add_local_generic(object, 0, r_type, this, got_offset, 0);
 }
 
 // Reserve a slot in the GOT for a local symbol or the second slot of a pair.
 
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 void
-Output_data_got<size, big_endian>::reserve_local(
+Output_data_got<got_size, big_endian>::reserve_local(
     unsigned int i,
-    Sized_relobj<size, big_endian>* object,
+    Relobj* object,
     unsigned int sym_index,
     unsigned int got_type)
 {
-  this->reserve_slot(i);
+  this->do_reserve_slot(i);
   object->set_local_got_offset(sym_index, got_type, this->got_offset(i));
 }
 
 // Reserve a slot in the GOT for a global symbol.
 
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 void
-Output_data_got<size, big_endian>::reserve_global(
+Output_data_got<got_size, big_endian>::reserve_global(
     unsigned int i,
     Symbol* gsym,
     unsigned int got_type)
 {
-  this->reserve_slot(i);
+  this->do_reserve_slot(i);
   gsym->set_got_offset(got_type, this->got_offset(i));
 }
 
 // Write out the GOT.
 
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 void
-Output_data_got<size, big_endian>::do_write(Output_file* of)
+Output_data_got<got_size, big_endian>::do_write(Output_file* of)
 {
-  const int add = size / 8;
+  const int add = got_size / 8;
 
   const off_t off = this->offset();
   const off_t oview_size = this->data_size();
   unsigned char* const oview = of->get_output_view(off, oview_size);
 
   unsigned char* pov = oview;
-  for (typename Got_entries::const_iterator p = this->entries_.begin();
-       p != this->entries_.end();
-       ++p)
+  for (unsigned int i = 0; i < this->entries_.size(); ++i)
     {
-      p->write(pov);
+      this->entries_[i].write(i, pov);
       pov += add;
     }
 
@@ -1704,9 +1690,9 @@ Output_data_got<size, big_endian>::do_write(Output_file* of)
 
 // Create a new GOT entry and return its offset.
 
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 unsigned int
-Output_data_got<size, big_endian>::add_got_entry(Got_entry got_entry)
+Output_data_got<got_size, big_endian>::add_got_entry(Got_entry got_entry)
 {
   if (!this->is_data_size_valid())
     {
@@ -1717,11 +1703,12 @@ Output_data_got<size, big_endian>::add_got_entry(Got_entry got_entry)
   else
     {
       // For an incremental update, find an available slot.
-      off_t got_offset = this->free_list_.allocate(size / 8, size / 8, 0);
+      off_t got_offset = this->free_list_.allocate(got_size / 8,
+                                                  got_size / 8, 0);
       if (got_offset == -1)
        gold_fallback(_("out of patch space (GOT);"
                        " relink with --incremental-full"));
-      unsigned int got_index = got_offset / (size / 8);
+      unsigned int got_index = got_offset / (got_size / 8);
       gold_assert(got_index < this->entries_.size());
       this->entries_[got_index] = got_entry;
       return static_cast<unsigned int>(got_offset);
@@ -1730,10 +1717,11 @@ Output_data_got<size, big_endian>::add_got_entry(Got_entry got_entry)
 
 // Create a pair of new GOT entries and return the offset of the first.
 
-template<int size, bool big_endian>
+template<int got_size, bool big_endian>
 unsigned int
-Output_data_got<size, big_endian>::add_got_entry_pair(Got_entry got_entry_1,
-                                                     Got_entry got_entry_2)
+Output_data_got<got_size, big_endian>::add_got_entry_pair(
+    Got_entry got_entry_1,
+    Got_entry got_entry_2)
 {
   if (!this->is_data_size_valid())
     {
@@ -1747,11 +1735,12 @@ Output_data_got<size, big_endian>::add_got_entry_pair(Got_entry got_entry_1,
   else
     {
       // For an incremental update, find an available pair of slots.
-      off_t got_offset = this->free_list_.allocate(2 * size / 8, size / 8, 0);
+      off_t got_offset = this->free_list_.allocate(2 * got_size / 8,
+                                                  got_size / 8, 0);
       if (got_offset == -1)
        gold_fallback(_("out of patch space (GOT);"
                        " relink with --incremental-full"));
-      unsigned int got_index = got_offset / (size / 8);
+      unsigned int got_index = got_offset / (got_size / 8);
       gold_assert(got_index < this->entries_.size());
       this->entries_[got_index] = got_entry_1;
       this->entries_[got_index + 1] = got_entry_2;
@@ -1759,6 +1748,18 @@ Output_data_got<size, big_endian>::add_got_entry_pair(Got_entry got_entry_1,
     }
 }
 
+// Replace GOT entry I with a new value.
+
+template<int got_size, bool big_endian>
+void
+Output_data_got<got_size, big_endian>::replace_got_entry(
+    unsigned int i,
+    Got_entry got_entry)
+{
+  gold_assert(i < this->entries_.size());
+  this->entries_[i] = got_entry;
+}
+
 // Output_data_dynamic::Dynamic_entry methods.
 
 // Write out the entry.
@@ -1934,7 +1935,7 @@ Output_symtab_xindex::endian_do_write(unsigned char* const oview)
        ++p)
     {
       unsigned int symndx = p->first;
-      gold_assert(symndx * 4 < this->data_size());
+      gold_assert(static_cast<off_t>(symndx) * 4 < this->data_size());
       elfcpp::Swap<32, big_endian>::writeval(oview + symndx * 4, p->second);
     }
 }
@@ -2303,7 +2304,10 @@ Output_section::Output_section(const char* name, elfcpp::Elf_Word type,
     always_keeps_input_sections_(false),
     has_fixed_layout_(false),
     is_patch_space_allowed_(false),
+    is_unique_segment_(false),
     tls_offset_(0),
+    extra_segment_flags_(0),
+    segment_alignment_(0),
     checkpoint_(NULL),
     lookup_maps_(new Output_section_lookup_maps),
     free_list_(),
@@ -2592,9 +2596,9 @@ Output_section::add_relaxed_input_section(Layout* layout,
 
   // For a relaxed section, we use the current data size.  Linker scripts
   // get all the input sections, including relaxed one from an output
-  // section and add them back to them same output section to compute the
+  // section and add them back to the same output section to compute the
   // output section size.  If we do not account for sizes of relaxed input
-  // sections,  an output section would be incorrectly sized.
+  // sections, an output section would be incorrectly sized.
   off_t offset_in_section = this->current_data_size_for_child();
   off_t aligned_offset_in_section = align_address(offset_in_section,
                                                  poris->addralign());
@@ -2761,7 +2765,7 @@ Output_section::convert_input_sections_in_list_to_relaxed_sections(
       (*input_sections)[p->second].set_section_order_index(soi);
     }
 }
-  
+
 // Convert regular input sections into relaxed input sections. RELAXED_SECTIONS
 // is a vector of pointers to Output_relaxed_input_section or its derived
 // classes.  The relaxed sections must correspond to existing input sections.
@@ -2776,7 +2780,7 @@ Output_section::convert_input_sections_to_relaxed_sections(
   // this.  If there is no checkpoint active, just search the current
   // input section list and replace the sections there.  If there is
   // a checkpoint, also replace the sections there.
-  
+
   // By default, we look at the whole list.
   size_t limit = this->input_sections_.size();
 
@@ -2889,13 +2893,13 @@ Output_section::build_lookup_maps() const
          for (Output_merge_base::Input_sections::const_iterator is =
                 pomb->input_sections_begin();
               is != pomb->input_sections_end();
-              ++is) 
+              ++is)
            {
              const Const_section_id& csid = *is;
            this->lookup_maps_->add_merge_input_section(csid.first,
                                                        csid.second, pomb);
            }
-           
+
        }
       else if (p->is_relaxed_input_section())
        {
@@ -2937,7 +2941,7 @@ Output_section::is_input_address_mapped(const Relobj* object,
     {
       section_offset_type output_offset;
       bool found = posd->output_offset(object, shndx, offset, &output_offset);
-      gold_assert(found);   
+      gold_assert(found);
       return output_offset != -1;
     }
 
@@ -2972,13 +2976,13 @@ Output_section::output_offset(const Relobj* object, unsigned int shndx,
 
   // Look at the Output_section_data_maps first.
   const Output_section_data* posd = this->find_merge_section(object, shndx);
-  if (posd == NULL) 
+  if (posd == NULL)
     posd = this->find_relaxed_input_section(object, shndx);
   if (posd != NULL)
     {
       section_offset_type output_offset;
       bool found = posd->output_offset(object, shndx, offset, &output_offset);
-      gold_assert(found);   
+      gold_assert(found);
       return output_offset;
     }
 
@@ -3005,7 +3009,7 @@ Output_section::output_address(const Relobj* object, unsigned int shndx,
 
   // Look at the Output_section_data_maps first.
   const Output_section_data* posd = this->find_merge_section(object, shndx);
-  if (posd == NULL) 
+  if (posd == NULL)
     posd = this->find_relaxed_input_section(object, shndx);
   if (posd != NULL && posd->is_address_valid())
     {
@@ -3491,7 +3495,7 @@ Output_section::Input_section_sort_section_order_index_compare::operator()(
   // Keep input order if section ordering cannot determine order.
   if (s1_secn_index == s2_secn_index)
     return s1.index() < s2.index();
-  
+
   return s1_secn_index < s2_secn_index;
 }
 
@@ -3854,7 +3858,7 @@ Output_section::add_script_input_section(const Input_section& sis)
 
   this->input_sections_.push_back(sis);
 
-  // Update fast lookup maps if necessary. 
+  // Update fast lookup maps if necessary.
   if (this->lookup_maps_->is_valid())
     {
       if (sis.is_merge_section())
@@ -4037,7 +4041,8 @@ Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags)
     flags_(flags),
     is_max_align_known_(false),
     are_addresses_set_(false),
-    is_large_data_segment_(false)
+    is_large_data_segment_(false),
+    is_unique_segment_(false)
 {
   // The ELF ABI specifies that a PT_TLS segment always has PF_R as
   // the flags.
@@ -4168,7 +4173,7 @@ Output_segment::maximum_alignment()
   if (!this->is_max_align_known_)
     {
       for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
-       {       
+       {
          const Output_data_list* pdl = &this->output_lists_[i];
          uint64_t addralign = Output_segment::maximum_alignment_list(pdl);
          if (addralign > this->max_align_)
@@ -4247,7 +4252,7 @@ Output_segment::set_section_addresses(Layout* layout, bool reset,
   bool in_tls = false;
 
   // If we have relro sections, we need to pad forward now so that the
-  // relro sections plus INCREASE_RELRO end on a common page boundary.
+  // relro sections plus INCREASE_RELRO end on an abi page boundary.
   if (parameters->options().relro()
       && this->is_first_section_relro()
       && (!this->are_addresses_set_ || reset))
@@ -4302,7 +4307,7 @@ Output_segment::set_section_addresses(Layout* layout, bool reset,
       last_relro_pad = aligned_size - relro_size;
       *has_relro = true;
 
-      uint64_t page_align = parameters->target().common_pagesize();
+      uint64_t page_align = parameters->target().abi_pagesize();
 
       // Align to offset N such that (N + RELRO_SIZE) % PAGE_ALIGN == 0.
       uint64_t desired_align = page_align - (aligned_size % page_align);
@@ -4612,7 +4617,7 @@ Output_segment::set_offset(unsigned int increase)
   // page boundary.
   if (this->type_ == elfcpp::PT_GNU_RELRO)
     {
-      uint64_t page_align = parameters->target().common_pagesize();
+      uint64_t page_align = parameters->target().abi_pagesize();
       uint64_t segment_end = this->vaddr_ + this->memsz_;
       if (parameters->incremental_update())
        {
@@ -4649,10 +4654,10 @@ Output_segment::set_tls_offsets()
     (*p)->set_tls_offset(this->vaddr_);
 }
 
-// Return the load address of the first section.
+// Return the first section.
 
-uint64_t
-Output_segment::first_section_load_address() const
+Output_section*
+Output_segment::first_section() const
 {
   for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
     {
@@ -4662,9 +4667,7 @@ Output_segment::first_section_load_address() const
           ++p)
        {
          if ((*p)->is_section())
-           return ((*p)->has_load_address()
-                   ? (*p)->load_address()
-                   : (*p)->address());
+           return (*p)->output_section();
        }
     }
   gold_unreachable();
@@ -5079,7 +5082,7 @@ Output_file::map_no_anonymous(bool writable)
   // but that would be a more significant performance hit.
   if (writable)
     {
-      int err = ::posix_fallocate(o, 0, this->file_size_);
+      int err = gold_fallocate(o, 0, this->file_size_);
       if (err != 0)
        gold_fatal(_("%s: %s"), this->name_, strerror(err));
     }
@@ -5106,7 +5109,8 @@ Output_file::map_no_anonymous(bool writable)
 void
 Output_file::map()
 {
-  if (this->map_no_anonymous(true))
+  if (parameters->options().mmap_output_file()
+      && this->map_no_anonymous(true))
     return;
 
   // The mmap call might fail because of file system issues: the file
@@ -5451,24 +5455,16 @@ template
 class Output_data_group<64, true>;
 #endif
 
-#ifdef HAVE_TARGET_32_LITTLE
 template
 class Output_data_got<32, false>;
-#endif
 
-#ifdef HAVE_TARGET_32_BIG
 template
 class Output_data_got<32, true>;
-#endif
 
-#ifdef HAVE_TARGET_64_LITTLE
 template
 class Output_data_got<64, false>;
-#endif
 
-#ifdef HAVE_TARGET_64_BIG
 template
 class Output_data_got<64, true>;
-#endif
 
 } // End namespace gold.