[arm] Make CEntryStub's handling of triple return values more robust.

src/arm/code-stubs-arm.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_ARM
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1037 matching lines @@
   {
     // Prevent literal pool emission before return address.
     Assembler::BlockConstPoolScope block_const_pool(masm);
     __ add(lr, pc, Operand(4));
     __ str(lr, MemOperand(sp, result_stack_size));
     __ Call(r5);
   }
   if (result_size() > 2) {
     DCHECK_EQ(3, result_size());
     // Read result values stored on stack.
-    __ ldr(r2, MemOperand(r0, 2 * kPointerSize));
-    __ ldr(r1, MemOperand(r0, 1 * kPointerSize));
-    __ ldr(r0, MemOperand(r0, 0 * kPointerSize));
+    __ ldr(r2, MemOperand(sp, 2 * kPointerSize));
+    __ ldr(r1, MemOperand(sp, 1 * kPointerSize));
+    __ ldr(r0, MemOperand(sp, 0 * kPointerSize));
   }
   // Result returned in r0, r1:r0 or r2:r1:r0 - do not destroy these registers!
 
   // Check result for exception sentinel.
   Label exception_returned;
   __ CompareRoot(r0, Heap::kExceptionRootIndex);
   __ b(eq, &exception_returned);
 
   // Check that there is no pending exception, otherwise we
   // should have returned the exception sentinel.
@@ skipping 4368 matching lines @@
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
                            kStackUnwindSpace, NULL, return_value_operand, NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM