Flags.hh

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/*
 * Copyright 2021 Assured Information Security, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once
 
#include <cstdint>
 
namespace introvirt {
namespace x86 {
 
class Flags {
  public:
    bool carry() const;
 
    bool parity() const;
 
    bool adjust() const;
 
    bool zero() const;
 
    bool sign() const;
 
    bool trap() const;
 
    bool interrupt() const;
 
    void interrupt(bool val);
 
    bool direction() const;
 
    bool overflow() const;
 
    int8_t iopl() const;
 
    bool nested_task() const;
 
    bool resume() const;
 
    bool virtual_8086() const;
 
    bool alignment_check() const;
 
    bool virtual_interrupt() const;
 
    bool virtual_interrupt_pending() const;
 
    bool cpuid() const;
 
    uint64_t value() const;
 
    void value(uint64_t value);
 
    explicit Flags();
 
    explicit Flags(uint64_t flags);
 
    explicit Flags(uint64_t& flags, bool* modified);
 
    Flags(const Flags& src) = delete;
    Flags& operator=(const Flags&) = delete;
 
    Flags& operator=(Flags&&) noexcept = default;
 
  private:
    inline void set_modified() {
        if (modified_ != nullptr)
            *modified_ = true;
    }
 
    uint64_t value_ = 0; // Used only for the default constructorm
    uint64_t* flags_;
    bool* modified_ = nullptr;
};
 
} // namespace x86
} // namespace introvirt