1 files changed, 65 insertions, 0 deletions
diff --git a/deps/v8/src/execution/pointer-authentication.h b/deps/v8/src/execution/pointer-authentication.h
new file mode 100644
index 0000000000..f2d63773f4
--- /dev/null
+++ b/deps/v8/src/execution/pointer-authentication.h
@@ -0,0 +1,65 @@
+// Copyright 2019 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_H_
+#define V8_EXECUTION_POINTER_AUTHENTICATION_H_
+
+#include "include/v8.h"
+#include "src/base/macros.h"
+#include "src/common/globals.h"
+
+namespace v8 {
+namespace internal {
+
+class PointerAuthentication : public AllStatic {
+ public:
+  // When CFI is enabled, authenticate the address stored in {pc_address} and
+  // return the authenticated address. {offset_from_sp} is the offset between
+  // {pc_address} and the pointer used as a context for signing.
+  // When CFI is not enabled, simply load return address from {pc_address} and
+  // return it.
+  V8_INLINE static Address AuthenticatePC(Address* pc_address,
+                                          unsigned offset_from_sp);
+
+  // When CFI is enabled, strip Pointer Authentication Code (PAC) from {pc} and
+  // return the raw value.
+  // When CFI is not enabled, return {pc} unmodified.
+  V8_INLINE static Address StripPAC(Address pc);
+
+  // When CFI is enabled, sign {pc} using {sp} and return the signed value.
+  // When CFI is not enabled, return {pc} unmodified.
+  V8_INLINE static Address SignPCWithSP(Address pc, Address sp);
+
+  // When CFI is enabled, authenticate the address stored in {pc_address} and
+  // replace it with {new_pc}, after signing it. {offset_from_sp} is the offset
+  // between {pc_address} and the pointer used as a context for signing.
+  // When CFI is not enabled, store {new_pc} to {pc_address} without signing.
+  V8_INLINE static void ReplacePC(Address* pc_address, Address new_pc,
+                                  int offset_from_sp);
+
+  // When CFI is enabled, authenticate the address stored in {pc_address} based
+  // on {old_context} and replace it with the same address signed with
+  // {new_context} instead.
+  // When CFI is not enabled, do nothing.
+  V8_INLINE static void ReplaceContext(Address* pc_address, Address old_context,
+                                       Address new_context);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#ifdef V8_ENABLE_CONTROL_FLOW_INTEGRITY
+
+#ifndef V8_TARGET_ARCH_ARM64
+#error "V8_ENABLE_CONTROL_FLOW_INTEGRITY should imply V8_TARGET_ARCH_ARM64"
+#endif
+#include "src/execution/arm64/pointer-authentication-arm64.h"
+
+#else
+
+#include "src/execution/pointer-authentication-dummy.h"
+
+#endif
+
+#endif  // V8_EXECUTION_POINTER_AUTHENTICATION_H_