S390: Initial impl of S390 asm, masm, code-stubs,...

src/s390/cpu-s390.cc

+// Copyright 2015 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.
+
+// CPU specific code for s390 independent of OS goes here.
+#include "src/v8.h"
+
+#if V8_TARGET_ARCH_S390
+
+#include "src/assembler.h"
+#include "src/macro-assembler.h"
+#include "src/simulator.h"  // for cache flushing.
+
+namespace v8 {
+namespace internal {
+
+void CpuFeatures::FlushICache(void* buffer, size_t size) {
+  // Nothing to do flushing no instructions.
+  if (size == 0) {
+    return;
+  }
+
+#if defined(USE_SIMULATOR)
+  // Not generating S390 instructions for C-code. This means that we are
+  // building an S390 emulator based target.  We should notify the simulator
+  // that the Icache was flushed.
+  // None of this code ends up in the snapshot so there are no issues
+  // around whether or not to generate the code when building snapshots.
+  Simulator::FlushICache(Isolate::Current()->simulator_i_cache(), buffer, size);

[jochen (gone - plz use gerrit), 2016/02/25 12:17:28]

please don't use Isolate::Current()

+#endif  // USE_SIMULATOR
+}
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_TARGET_ARCH_S390