mirror of
https://github.com/libretro/ppsspp.git
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144 lines
3.8 KiB
C++
144 lines
3.8 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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#include <map>
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#include "Common.h"
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#include "x64Emitter.h"
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#include "MemoryUtil.h"
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#include "ABI.h"
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#include "Thunk.h"
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#define THUNK_ARENA_SIZE 1024*1024*1
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namespace
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{
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static u8 GC_ALIGNED32(saved_fp_state[16 * 4 * 4]);
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static u8 GC_ALIGNED32(saved_gpr_state[16 * 8]);
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static u16 saved_mxcsr;
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} // namespace
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using namespace Gen;
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void ThunkManager::Init()
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{
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AllocCodeSpace(THUNK_ARENA_SIZE);
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save_regs = GetCodePtr();
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for (int i = 2; i < ABI_GetNumXMMRegs(); i++)
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MOVAPS(M(saved_fp_state + i * 16), (X64Reg)(XMM0 + i));
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STMXCSR(M(&saved_mxcsr));
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#ifdef _M_X64
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MOV(64, M(saved_gpr_state + 0 ), R(RCX));
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MOV(64, M(saved_gpr_state + 8 ), R(RDX));
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MOV(64, M(saved_gpr_state + 16), R(R8) );
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MOV(64, M(saved_gpr_state + 24), R(R9) );
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MOV(64, M(saved_gpr_state + 32), R(R10));
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MOV(64, M(saved_gpr_state + 40), R(R11));
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#ifndef _WIN32
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MOV(64, M(saved_gpr_state + 48), R(RSI));
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MOV(64, M(saved_gpr_state + 56), R(RDI));
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#endif
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MOV(64, M(saved_gpr_state + 64), R(RBX));
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#else
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MOV(32, M(saved_gpr_state + 0 ), R(RCX));
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MOV(32, M(saved_gpr_state + 4 ), R(RDX));
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#endif
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RET();
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load_regs = GetCodePtr();
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LDMXCSR(M(&saved_mxcsr));
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for (int i = 2; i < ABI_GetNumXMMRegs(); i++)
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MOVAPS((X64Reg)(XMM0 + i), M(saved_fp_state + i * 16));
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#ifdef _M_X64
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MOV(64, R(RCX), M(saved_gpr_state + 0 ));
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MOV(64, R(RDX), M(saved_gpr_state + 8 ));
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MOV(64, R(R8) , M(saved_gpr_state + 16));
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MOV(64, R(R9) , M(saved_gpr_state + 24));
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MOV(64, R(R10), M(saved_gpr_state + 32));
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MOV(64, R(R11), M(saved_gpr_state + 40));
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#ifndef _WIN32
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MOV(64, R(RSI), M(saved_gpr_state + 48));
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MOV(64, R(RDI), M(saved_gpr_state + 56));
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#endif
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MOV(64, R(RBX), M(saved_gpr_state + 64));
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#else
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MOV(32, R(RCX), M(saved_gpr_state + 0 ));
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MOV(32, R(RDX), M(saved_gpr_state + 4 ));
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#endif
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RET();
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}
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void ThunkManager::Reset()
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{
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thunks.clear();
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ResetCodePtr();
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}
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void ThunkManager::Shutdown()
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{
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Reset();
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FreeCodeSpace();
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}
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void *ThunkManager::ProtectFunction(void *function, int num_params)
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{
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std::map<void *, const u8 *>::iterator iter;
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iter = thunks.find(function);
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if (iter != thunks.end())
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return (void *)iter->second;
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if (!region)
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PanicAlert("Trying to protect functions before the emu is started. Bad bad bad.");
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const u8 *call_point = GetCodePtr();
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// Make sure to align stack.
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#ifdef _M_X64
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#ifdef _WIN32
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SUB(64, R(ESP), Imm8(0x28));
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#else
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SUB(64, R(ESP), Imm8(0x8));
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#endif
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ABI_CallFunction((void*)save_regs);
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ABI_CallFunction((void*)function);
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ABI_CallFunction((void*)load_regs);
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#ifdef _WIN32
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ADD(64, R(ESP), Imm8(0x28));
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#else
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ADD(64, R(ESP), Imm8(0x8));
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#endif
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RET();
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#else
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CALL((void*)save_regs);
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// Since parameters are in the previous stack frame, not in registers, this takes some
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// trickery : we simply re-push the parameters. might not be optimal, but that doesn't really
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// matter.
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ABI_AlignStack(num_params * 4);
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unsigned int alignedSize = ABI_GetAlignedFrameSize(num_params * 4);
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for (int i = 0; i < num_params; i++) {
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// ESP is changing, so we do not need i
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PUSH(32, MDisp(ESP, alignedSize - 4));
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}
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CALL(function);
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ABI_RestoreStack(num_params * 4);
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CALL((void*)load_regs);
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RET();
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#endif
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thunks[function] = call_point;
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return (void *)call_point;
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}
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