Store FP instead of SP in the exit info when transitioning from Dart to C++.

runtime/vm/stub_code_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 33 matching lines @@
   const intptr_t retval_offset = NativeArguments::retval_offset();
 
   __ EnterFrame(0);
 
   COMPILE_ASSERT(
       (CallingConventions::kCalleeSaveCpuRegisters & (1 << R12)) != 0);
   __ LoadIsolate(R12);
 
   // Save exit frame information to enable stack walking as we are about
   // to transition to Dart VM C++ code.
-  __ movq(Address(R12, Isolate::top_exit_frame_info_offset()), RSP);
+  __ movq(Address(R12, Isolate::top_exit_frame_info_offset()), RBP);
 
 #if defined(DEBUG)
   { Label ok;
     // Check that we are always entering from Dart code.
     __ movq(RAX, Immediate(VMTag::kDartTagId));
     __ cmpq(RAX, Address(R12, Isolate::vm_tag_offset()));
     __ j(EQUAL, &ok, Assembler::kNearJump);
     __ Stop("Not coming from Dart code.");
     __ Bind(&ok);
   }
@@ skipping 76 matching lines @@
       NativeArguments::retval_offset() + native_args_struct_offset;
 
   __ EnterFrame(0);
 
   COMPILE_ASSERT(
       (CallingConventions::kCalleeSaveCpuRegisters & (1 << R12)) != 0);
   __ LoadIsolate(R12);
 
   // Save exit frame information to enable stack walking as we are about
   // to transition to native code.
-  __ movq(Address(R12, Isolate::top_exit_frame_info_offset()), RSP);
+  __ movq(Address(R12, Isolate::top_exit_frame_info_offset()), RBP);
 
 #if defined(DEBUG)
   { Label ok;
     // Check that we are always entering from Dart code.
     __ movq(R8, Immediate(VMTag::kDartTagId));
     __ cmpq(R8, Address(R12, Isolate::vm_tag_offset()));
     __ j(EQUAL, &ok, Assembler::kNearJump);
     __ Stop("Not coming from Dart code.");
     __ Bind(&ok);
   }
@@ skipping 53 matching lines @@
       NativeArguments::retval_offset() + native_args_struct_offset;
 
   __ EnterFrame(0);
 
   COMPILE_ASSERT(
       (CallingConventions::kCalleeSaveCpuRegisters & (1 << R12)) != 0);
   __ LoadIsolate(R12);
 
   // Save exit frame information to enable stack walking as we are about
   // to transition to native code.
-  __ movq(Address(R12, Isolate::top_exit_frame_info_offset()), RSP);
+  __ movq(Address(R12, Isolate::top_exit_frame_info_offset()), RBP);
 
 #if defined(DEBUG)
   { Label ok;
     // Check that we are always entering from Dart code.
     __ movq(R8, Immediate(VMTag::kDartTagId));
     __ cmpq(R8, Address(R12, Isolate::vm_tag_offset()));
     __ j(EQUAL, &ok, Assembler::kNearJump);
     __ Stop("Not coming from Dart code.");
     __ Bind(&ok);
   }
@@ skipping 1938 matching lines @@
 // Result:
 //  RCX: entry point.
 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
   EmitMegamorphicLookup(assembler, RDI, RBX, RCX);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64