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92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
// Copyright (C) 2003 Dolphin Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0 or later versions.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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#pragma once
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#include <map>
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#include "Common.h"
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#include "x64Emitter.h"
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// This simple class creates a wrapper around a C/C++ function that saves all fp state
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// before entering it, and restores it upon exit. This is required to be able to selectively
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// call functions from generated code, without inflicting the performance hit and increase
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// of complexity that it means to protect the generated code from this problem.
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// This process is called thunking.
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// Only used for X86 right now.
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// There will only ever be one level of thunking on the stack, plus,
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// we don't want to pollute the stack, so we store away regs somewhere global.
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// NOT THREAD SAFE. This may only be used from the CPU thread.
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// Any other thread using this stuff will be FATAL.
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typedef Gen::XEmitter ThunkEmitter;
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typedef Gen::XCodeBlock ThunkCodeBlock;
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class ThunkManager : public ThunkCodeBlock
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{
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std::map<const void *, const u8 *> thunks;
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const u8 *save_regs;
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const u8 *load_regs;
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public:
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ThunkManager() {
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Init();
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}
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~ThunkManager() {
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Shutdown();
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}
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const void *ProtectFunction(const void *function, int num_params);
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template <typename Tr>
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const void *ProtectFunction(Tr (*func)()) {
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return ProtectFunction((const void *)func, 0);
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}
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template <typename Tr, typename T1>
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const void *ProtectFunction(Tr (*func)(T1)) {
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return ProtectFunction((const void *)func, 1);
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}
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template <typename Tr, typename T1, typename T2>
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const void *ProtectFunction(Tr (*func)(T1, T2)) {
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return ProtectFunction((const void *)func, 2);
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}
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template <typename Tr, typename T1, typename T2, typename T3>
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const void *ProtectFunction(Tr (*func)(T1, T2, T3)) {
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return ProtectFunction((const void *)func, 3);
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}
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template <typename Tr, typename T1, typename T2, typename T3, typename T4>
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const void *ProtectFunction(Tr (*func)(T1, T2, T3, T4)) {
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return ProtectFunction((const void *)func, 4);
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}
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void Enter(ThunkEmitter *emit, bool withinCall = false);
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void Leave(ThunkEmitter *emit, bool withinCall = false);
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private:
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void Init();
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void Shutdown();
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void Reset();
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int ThunkStackOffset();
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int ThunkBytesNeeded();
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};
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