MIPS64: Add big-endian support for mips64.

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index c447a79a5daa0d1ed6e9581293f6c4cd46bb1342..d0c05ad0ccb0fc713509825e58344d0cd80213ea 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -182,8 +182,10 @@ void DoubleToIStub::Generate(MacroAssembler* masm) {
   Register input_high = scratch2;
   Register input_low = scratch3;
 
-  __ lw(input_low, MemOperand(input_reg, double_offset));
-  __ lw(input_high, MemOperand(input_reg, double_offset + kIntSize));
+  __ lw(input_low,
+        MemOperand(input_reg, double_offset + Register::kMantissaOffset));
+  __ lw(input_high,
+        MemOperand(input_reg, double_offset + Register::kExponentOffset));
 
   Label normal_exponent, restore_sign;
   // Extract the biased exponent in result.
@@ -3309,7 +3311,7 @@ void ToNumberStub::Generate(MacroAssembler* masm) {
   Label not_string, slow_string;
   __ Branch(&not_string, hs, a1, Operand(FIRST_NONSTRING_TYPE));
   // Check if string has a cached array index.
-  __ ld(a2, FieldMemOperand(a0, String::kHashFieldOffset));
+  __ lwu(a2, FieldMemOperand(a0, String::kHashFieldOffset));
   __ And(at, a2, Operand(String::kContainsCachedArrayIndexMask));
   __ Branch(&slow_string, ne, at, Operand(zero_reg));
   __ IndexFromHash(a2, a0);
@@ -5602,8 +5604,8 @@ static void CallApiFunctionStubHelper(MacroAssembler* masm,
   //  --
   //  -- sp[0]               : last argument
   //  -- ...
-  //  -- sp[(argc - 1)* 4]   : first argument
-  //  -- sp[argc * 4]        : receiver
+  //  -- sp[(argc - 1)* 8]   : first argument
+  //  -- sp[argc * 8]        : receiver
   // -----------------------------------
 
   Register callee = a0;
@@ -5662,10 +5664,12 @@ static void CallApiFunctionStubHelper(MacroAssembler* masm,
              Operand((FCA::kArgsLength - 1 + argc.immediate()) * kPointerSize));
     __ sd(at, MemOperand(a0, 1 * kPointerSize));
     // FunctionCallbackInfo::length_ = argc
+    // Stored as int field, 32-bit integers within struct on stack always left
+    // justified by n64 ABI.
     __ li(at, Operand(argc.immediate()));
-    __ sd(at, MemOperand(a0, 2 * kPointerSize));
+    __ sw(at, MemOperand(a0, 2 * kPointerSize));
     // FunctionCallbackInfo::is_construct_call_ = 0
-    __ sd(zero_reg, MemOperand(a0, 3 * kPointerSize));
+    __ sw(zero_reg, MemOperand(a0, 2 * kPointerSize + kIntSize));
   } else {
     // FunctionCallbackInfo::values_
     __ dsll(at, argc.reg(), kPointerSizeLog2);
@@ -5673,11 +5677,13 @@ static void CallApiFunctionStubHelper(MacroAssembler* masm,
     __ Daddu(at, at, Operand((FCA::kArgsLength - 1) * kPointerSize));
     __ sd(at, MemOperand(a0, 1 * kPointerSize));
     // FunctionCallbackInfo::length_ = argc
-    __ sd(argc.reg(), MemOperand(a0, 2 * kPointerSize));
+    // Stored as int field, 32-bit integers within struct on stack always left
+    // justified by n64 ABI.
+    __ sw(argc.reg(), MemOperand(a0, 2 * kPointerSize));
     // FunctionCallbackInfo::is_construct_call_
     __ Daddu(argc.reg(), argc.reg(), Operand(FCA::kArgsLength + 1));
     __ dsll(at, argc.reg(), kPointerSizeLog2);
-    __ sd(at, MemOperand(a0, 3 * kPointerSize));
+    __ sw(at, MemOperand(a0, 2 * kPointerSize + kIntSize));
   }
 
   ExternalReference thunk_ref =