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// 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-internal.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, 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, sign {pc} using {sp}, check the address and return the
// signed value. When CFI is not enabled, return {pc} unmodified. This method
// only applies in the deoptimizer.
V8_INLINE static Address SignAndCheckPC(Address pc, Address sp);
};
} // 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_
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