MIPS64: Add big-endian support for mips64.

src/mips64/macro-assembler-mips64.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_MIPS_MACRO_ASSEMBLER_MIPS_H_
 #define V8_MIPS_MACRO_ASSEMBLER_MIPS_H_
 
 #include "src/assembler.h"
 #include "src/globals.h"
 #include "src/mips64/assembler-mips64.h"
@@ skipping 1437 matching lines @@
   // control continues at the label not_power_of_two. If reg is a power of two
   // the register scratch contains the value of (reg - 1) when control falls
   // through.
   void JumpIfNotPowerOfTwoOrZero(Register reg,
                                  Register scratch,
                                  Label* not_power_of_two_or_zero);
 
   // -------------------------------------------------------------------------
   // Smi utilities.
 
+#if defined(V8_TARGET_LITTLE_ENDIAN)
+#define SmiWordOffset(offset) (offset + kPointerSize / 2)
+#else
+#define SmiWordOffset(offset) offset
+#endif
+
   // Test for overflow < 0: use BranchOnOverflow() or BranchOnNoOverflow().
   void SmiTagCheckOverflow(Register reg, Register overflow);
   void SmiTagCheckOverflow(Register dst, Register src, Register overflow);
 
   void SmiTag(Register dst, Register src) {
     STATIC_ASSERT(kSmiTag == 0);
     if (SmiValuesAre32Bits()) {
       STATIC_ASSERT(kSmiShift == 32);
       dsll32(dst, src, 0);
     } else {
@@ skipping 371 matching lines @@
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_MIPS_MACRO_ASSEMBLER_MIPS_H_