MIPS[64]: Fix mips port.

The CL fixes the mips port in the CL [debug] introduced runtime side
effect check (7a2c3713), that caused
several test failures.

BUG=

Change-Id: Ia1b45fd57d7b77c912562c97f7fc6bf2aa378fe2
Reviewed-on: https://chromium-review.googlesource.com/1030193Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
Commit-Queue: Miran Karić <miran.karic@mips.com>
Cr-Commit-Position: refs/heads/master@{#52982}

src/builtins/mips/builtins-mips.cc

@@ -10,6 +10,7 @@
 #include "src/deoptimizer.h"
 #include "src/frame-constants.h"
 #include "src/frames.h"
+#include "src/mips/constants-mips.h"
 #include "src/objects-inl.h"
 #include "src/runtime/runtime.h"
 
@@ -1048,7 +1049,7 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
   ExternalReference debug_execution_mode =
       ExternalReference::debug_execution_mode_address(masm->isolate());
   __ li(t0, Operand(debug_execution_mode));
-  __ lb(t0, MemOperand(t0));
+  __ lb(t0, MemOperand(t0, kLeastSignificantByteInInt32Offset));
   STATIC_ASSERT(static_cast<int>(DebugInfo::kDebugExecutionMode) ==
                 static_cast<int>(DebugInfo::kSideEffects));
   __ Branch(&bytecode_array_loaded, eq, t0, Operand(t1));

src/builtins/mips64/builtins-mips64.cc

@@ -10,6 +10,7 @@
 #include "src/deoptimizer.h"
 #include "src/frame-constants.h"
 #include "src/frames.h"
+#include "src/mips64/constants-mips64.h"
 #include "src/objects-inl.h"
 #include "src/runtime/runtime.h"
 
@@ -1046,7 +1047,7 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
   ExternalReference debug_execution_mode =
       ExternalReference::debug_execution_mode_address(masm->isolate());
   __ li(a4, Operand(debug_execution_mode));
-  __ Lb(a4, MemOperand(a4));
+  __ Lb(a4, MemOperand(a4, kLeastSignificantByteInInt32Offset));
   STATIC_ASSERT(static_cast<int>(DebugInfo::kDebugExecutionMode) ==
                 static_cast<int>(DebugInfo::kSideEffects));
   __ Branch(&bytecode_array_loaded, eq, a4, Operand(a5));

src/mips/constants-mips.h

@@ -122,6 +122,14 @@ const uint32_t kMipsSwlOffset = 0;
 #error Unknown endianness
 #endif
 
+#if defined(V8_TARGET_LITTLE_ENDIAN)
+const uint32_t kLeastSignificantByteInInt32Offset = 0;
+#elif defined(V8_TARGET_BIG_ENDIAN)
+const uint32_t kLeastSignificantByteInInt32Offset = 3;
+#else
+#error Unknown endianness
+#endif
+
 #ifndef __STDC_FORMAT_MACROS
 #define __STDC_FORMAT_MACROS
 #endif

src/mips64/constants-mips64.h

@@ -82,6 +82,14 @@ const uint32_t kMipsSdlOffset = 0;
 #error Unknown endianness
 #endif
 
+#if defined(V8_TARGET_LITTLE_ENDIAN)
+const uint32_t kLeastSignificantByteInInt32Offset = 0;
+#elif defined(V8_TARGET_BIG_ENDIAN)
+const uint32_t kLeastSignificantByteInInt32Offset = 3;
+#else
+#error Unknown endianness
+#endif
+
 #ifndef __STDC_FORMAT_MACROS
 #define __STDC_FORMAT_MACROS
 #endif