2012-04-23  Cary Coutant  <ccoutant@google.com>

elfcpp/

	* elfcpp_swap.h (struct Swap_aligned32): New template.

gold/

	* gdb-index.cc (Gdb_index::do_write): Use Swap_aligned32 for writing
	CU range table of gdb index.


commit 20f450f1aa8b7bcceaff1c2475ee993e9fd21fd2
Author: Cary Coutant <ccoutant@google.com>
Date:   Mon Apr 23 15:31:45 2012 -0700

    Add Swap_aligned32 template for writing gdb index.

diff --git a/elfcpp/elfcpp_swap.h b/elfcpp/elfcpp_swap.h
index 0685276..2e2ef7c 100644
--- a/elfcpp/elfcpp_swap.h
+++ b/elfcpp/elfcpp_swap.h
@@ -1,6 +1,6 @@
 // elfcpp_swap.h -- Handle swapping for elfcpp   -*- C++ -*-
 
-// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2012 Free Software Foundation, Inc.
 // Written by Ian Lance Taylor <iant@google.com>.
 
 // This file is part of elfcpp.
@@ -430,6 +430,71 @@ struct Swap_unaligned<64, true>
   }
 };
 
+// Swap_aligned32 is a template based on size and on whether the
+// target is big endian.  It defines the type Valtype and the
+// functions readval and writeval.  The functions read and write
+// values of the appropriate size out of buffers which may not be
+// 64-bit aligned, but are 32-bit aligned.
+
+template<int size, bool big_endian>
+struct Swap_aligned32
+{
+  typedef typename Valtype_base<size>::Valtype Valtype;
+
+  static inline Valtype
+  readval(const unsigned char* wv)
+  { return Swap<size, big_endian>::readval(
+	reinterpret_cast<const Valtype*>(wv)); }
+
+  static inline void
+  writeval(unsigned char* wv, Valtype v)
+  { Swap<size, big_endian>::writeval(reinterpret_cast<Valtype*>(wv), v); }
+};
+
+template<>
+struct Swap_aligned32<64, true>
+{
+  typedef Valtype_base<64>::Valtype Valtype;
+
+  static inline Valtype
+  readval(const unsigned char* wv)
+  {
+    return ((static_cast<Valtype>(Swap<32, true>::readval(wv)) << 32)
+	    | static_cast<Valtype>(Swap<32, true>::readval(wv+4)));
+  }
+
+  static inline void
+  writeval(unsigned char* wv, Valtype v)
+  {
+    typedef Valtype_base<32>::Valtype Valtype32;
+
+    Swap<32, true>::writeval(wv, static_cast<Valtype32>(v >> 32));
+    Swap<32, true>::writeval(wv+4, static_cast<Valtype32>(v));
+  }
+};
+
+template<>
+struct Swap_aligned32<64, false>
+{
+  typedef Valtype_base<64>::Valtype Valtype;
+
+  static inline Valtype
+  readval(const unsigned char* wv)
+  {
+    return ((static_cast<Valtype>(Swap<32, false>::readval(wv+4)) << 32)
+	    | static_cast<Valtype>(Swap<32, false>::readval(wv)));
+  }
+
+  static inline void
+  writeval(unsigned char* wv, Valtype v)
+  {
+    typedef Valtype_base<32>::Valtype Valtype32;
+
+    Swap<32, false>::writeval(wv+4, static_cast<Valtype32>(v >> 32));
+    Swap<32, false>::writeval(wv, static_cast<Valtype32>(v));
+  }
+};
+
 } // End namespace elfcpp.
 
 #endif // !defined(ELFCPP_SWAP_H)
diff --git a/gold/gdb-index.cc b/gold/gdb-index.cc
index 07ba2ab..a6db505 100644
--- a/gold/gdb-index.cc
+++ b/gold/gdb-index.cc
@@ -1166,8 +1166,9 @@ Gdb_index::do_write(Output_file* of)
 	      base = (os->address()
 		      + object->output_section_offset(range.shndx));
 	    }
-	  elfcpp::Swap_unaligned<64, false>::writeval(pov, base + range.start);
-	  elfcpp::Swap_unaligned<64, false>::writeval(pov + 8, base + range.end);
+	  elfcpp::Swap_aligned32<64, false>::writeval(pov, base + range.start);
+	  elfcpp::Swap_aligned32<64, false>::writeval(pov + 8,
+						      base + range.end);
 	  elfcpp::Swap<32, false>::writeval(pov + 16, cu_index);
 	  pov += 20;
 	}