[Interpreter] Fix bytecode offset for stack overflows.

src/ppc/builtins-ppc.cc

 // Copyright 2014 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_PPC
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1007 matching lines @@
   __ beq(&bytecode_array_not_present);
 
   if (FLAG_debug_code) {
     __ TestIfSmi(kInterpreterBytecodeArrayRegister, r0);
     __ Assert(ne, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
     __ CompareObjectType(kInterpreterBytecodeArrayRegister, r3, no_reg,
                          BYTECODE_ARRAY_TYPE);
     __ Assert(eq, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
   }
 
-  // Push new.target, bytecode array and zero for bytecode array offset.
-  __ li(r3, Operand::Zero());
+  // Load initial bytecode offset.
+  __ mov(kInterpreterBytecodeOffsetRegister,
+         Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
+
+  // Push new.target, bytecode array and Smi tagged bytecode array offset.
+  __ SmiTag(r3, kInterpreterBytecodeOffsetRegister);
   __ Push(r6, kInterpreterBytecodeArrayRegister, r3);
 
   // Allocate the local and temporary register file on the stack.
   {
     // Load frame size (word) from the BytecodeArray object.
     __ lwz(r5, FieldMemOperand(kInterpreterBytecodeArrayRegister,
                                BytecodeArray::kFrameSizeOffset));
 
     // Do a stack check to ensure we don't go over the limit.
     Label ok;
@@ skipping 10 matching lines @@
     __ LoadRoot(r6, Heap::kUndefinedValueRootIndex);
     __ ShiftRightImm(r5, r5, Operand(kPointerSizeLog2), SetRC);
     __ beq(&no_args, cr0);
     __ mtctr(r5);
     __ bind(&loop);
     __ push(r6);
     __ bdnz(&loop);
     __ bind(&no_args);
   }
 
-  // Load accumulator, register file, bytecode offset, dispatch table into
-  // registers.
+  // Load accumulator and dispatch table into registers.
   __ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
-  __ addi(r7, fp, Operand(InterpreterFrameConstants::kRegisterFileFromFp));
-  __ mov(kInterpreterBytecodeOffsetRegister,
-         Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
   __ mov(kInterpreterDispatchTableRegister,
          Operand(ExternalReference::interpreter_dispatch_table_address(
              masm->isolate())));
 
   // Dispatch to the first bytecode handler for the function.
   __ lbzx(r4, MemOperand(kInterpreterBytecodeArrayRegister,
                          kInterpreterBytecodeOffsetRegister));
   __ ShiftLeftImm(ip, r4, Operand(kPointerSizeLog2));
   __ LoadPX(ip, MemOperand(kInterpreterDispatchTableRegister, ip));
   __ Call(ip);
@@ skipping 1825 matching lines @@
     __ bkpt(0);
   }
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC