[Interpreter] Fix bytecode offset for stack overflows.

src/mips/builtins-mips.cc

 // 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.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 984 matching lines @@
                 Heap::kUndefinedValueRootIndex, &bytecode_array_not_present);
   if (FLAG_debug_code) {
     __ SmiTst(kInterpreterBytecodeArrayRegister, t0);
     __ Assert(ne, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry, t0,
               Operand(zero_reg));
     __ GetObjectType(kInterpreterBytecodeArrayRegister, t0, t0);
     __ Assert(eq, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry, t0,
               Operand(BYTECODE_ARRAY_TYPE));
   }
 
-  // Push new.target, bytecode array and zero for bytecode array offset.
-  __ Push(a3, kInterpreterBytecodeArrayRegister, zero_reg);
+  // Load initial bytecode offset.
+  __ li(kInterpreterBytecodeOffsetRegister,
+        Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
+
+  // Push new.target, bytecode array and Smi tagged bytecode array offset.
+  __ SmiTag(t0, kInterpreterBytecodeOffsetRegister);
+  __ Push(a3, kInterpreterBytecodeArrayRegister, t0);
 
   // Allocate the local and temporary register file on the stack.
   {
     // Load frame size from the BytecodeArray object.
     __ lw(t0, FieldMemOperand(kInterpreterBytecodeArrayRegister,
                               BytecodeArray::kFrameSizeOffset));
 
     // Do a stack check to ensure we don't go over the limit.
     Label ok;
     __ Subu(t1, sp, Operand(t0));
     __ LoadRoot(a2, Heap::kRealStackLimitRootIndex);
     __ Branch(&ok, hs, t1, Operand(a2));
     __ CallRuntime(Runtime::kThrowStackOverflow);
     __ bind(&ok);
 
     // If ok, push undefined as the initial value for all register file entries.
     Label loop_header;
     Label loop_check;
     __ LoadRoot(t1, Heap::kUndefinedValueRootIndex);
     __ Branch(&loop_check);
     __ bind(&loop_header);
     // TODO(rmcilroy): Consider doing more than one push per loop iteration.
     __ push(t1);
     // Continue loop if not done.
     __ bind(&loop_check);
     __ Subu(t0, t0, Operand(kPointerSize));
     __ Branch(&loop_header, ge, t0, Operand(zero_reg));
   }
 
-  // Load bytecode offset and dispatch table into registers.
+  // Load accumulator and dispatch table into registers.
   __ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
-  __ Addu(t3, fp, Operand(InterpreterFrameConstants::kRegisterFileFromFp));
-  __ li(kInterpreterBytecodeOffsetRegister,
-        Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
   __ li(kInterpreterDispatchTableRegister,
         Operand(ExternalReference::interpreter_dispatch_table_address(
             masm->isolate())));
 
   // Dispatch to the first bytecode handler for the function.
   __ Addu(a0, kInterpreterBytecodeArrayRegister,
           kInterpreterBytecodeOffsetRegister);
   __ lbu(a0, MemOperand(a0));
   __ Lsa(at, kInterpreterDispatchTableRegister, a0, kPointerSizeLog2);
   __ lw(at, MemOperand(at));
@@ skipping 1851 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS