1 files changed, 56 insertions, 0 deletions
diff --git a/deps/v8/src/execution/pointer-authentication-dummy.h b/deps/v8/src/execution/pointer-authentication-dummy.h
new file mode 100644
index 0000000000..32a10dc0dd
--- /dev/null
+++ b/deps/v8/src/execution/pointer-authentication-dummy.h
@@ -0,0 +1,56 @@
+// Copyright 2020 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.
+
+#ifndef V8_EXECUTION_POINTER_AUTHENTICATION_DUMMY_H_
+#define V8_EXECUTION_POINTER_AUTHENTICATION_DUMMY_H_
+
+#include "src/execution/pointer-authentication.h"
+
+#include "include/v8.h"
+#include "src/base/macros.h"
+#include "src/common/globals.h"
+
+namespace v8 {
+namespace internal {
+
+// Dummy implementation of the PointerAuthentication class methods, to be used
+// when CFI is not enabled.
+
+// Load return address from {pc_address} and return it.
+V8_INLINE Address PointerAuthentication::AuthenticatePC(
+    Address* pc_address, unsigned offset_from_sp) {
+  USE(offset_from_sp);
+  return *pc_address;
+}
+
+// Return {pc} unmodified.
+V8_INLINE Address PointerAuthentication::StripPAC(Address pc) { return pc; }
+
+// Return {pc} unmodified.
+V8_INLINE Address PointerAuthentication::SignPCWithSP(Address pc, Address sp) {
+  USE(sp);
+  return pc;
+}
+
+// Store {new_pc} to {pc_address} without signing.
+V8_INLINE void PointerAuthentication::ReplacePC(Address* pc_address,
+                                                Address new_pc,
+                                                int offset_from_sp) {
+  USE(offset_from_sp);
+  *pc_address = new_pc;
+}
+
+// Do nothing.
+V8_INLINE void PointerAuthentication::ReplaceContext(Address* pc_address,
+                                                     Address old_context,
+                                                     Address new_context) {
+  USE(pc_address);
+  USE(old_context);
+  USE(new_context);
+}
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_EXECUTION_POINTER_AUTHENTICATION_DUMMY_H_