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// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#ifndef _THUNK_H_
#define _THUNK_H_
#include <map>
#include "common/common.h"
// This simple class creates a wrapper around a C/C++ function that saves all fp state
// before entering it, and restores it upon exit. This is required to be able to selectively
// call functions from generated code, without inflicting the performance hit and increase
// of complexity that it means to protect the generated code from this problem.
// This process is called thunking.
// There will only ever be one level of thunking on the stack, plus,
// we don't want to pollute the stack, so we store away regs somewhere global.
// NOT THREAD SAFE. This may only be used from the CPU thread.
// Any other thread using this stuff will be FATAL.
class ThunkManager : public Gen::XCodeBlock
{
std::map<void *, const u8 *> thunks;
const u8 *save_regs;
const u8 *load_regs;
public:
ThunkManager() {
Init();
}
~ThunkManager() {
Shutdown();
}
void *ProtectFunction(void *function, int num_params);
private:
void Init();
void Shutdown();
void Reset();
};
#endif // _THUNK_H_
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