SystemCallConverter.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 <introvirt/windows/fwd.hh>
#include <introvirt/windows/kernel/SystemCallIndex.hh>
 
#include <cstdint>
#include <memory>
#include <unordered_map>
#include <vector>
 
namespace introvirt {
namespace windows {
 
class SystemCallConverter final {
  public:
    SystemCallIndex normalize(uint32_t index) const;
 
    uint32_t native(SystemCallIndex index) const;
 
    uint32_t count() const;
 
    SystemCallConverter(const WindowsGuest& guest);
 
    ~SystemCallConverter();
 
    static constexpr uint64_t SystemCallIndexMask = 0x1FFF;
 
  private:
    SystemCallIndex _normalize(uint32_t index,
                               const std::vector<SystemCallIndex>& to_normalized) const;
 
    std::vector<SystemCallIndex> to_normalized_nt_;
    std::vector<SystemCallIndex> to_normalized_win32k_;
 
    std::unordered_map<SystemCallIndex, uint32_t> to_native_;
};
 
} // namespace windows
} // namespace introvirt