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// 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_
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