77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
/* This file is part of the dynarmic project.
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* Copyright (c) 2016 MerryMage
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* This software may be used and distributed according to the terms of the GNU
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* General Public License version 2 or any later version.
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*/
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#include <limits>
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#include "backend_x64/jitstate.h"
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#include "backend_x64/routines.h"
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#include "common/x64/abi.h"
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using namespace Gen;
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namespace Dynarmic {
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namespace BackendX64 {
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Routines::Routines() {
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AllocCodeSpace(1024);
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GenConstants();
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GenRunCode();
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}
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size_t Routines::RunCode(JitState* jit_state, CodePtr basic_block, size_t cycles_to_run) const {
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constexpr size_t max_cycles_to_run = static_cast<size_t>(std::numeric_limits<decltype(jit_state->cycles_remaining)>::max());
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ASSERT(cycles_to_run <= max_cycles_to_run);
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jit_state->cycles_remaining = cycles_to_run;
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run_code(jit_state, basic_block);
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return cycles_to_run - jit_state->cycles_remaining; // Return number of cycles actually run.
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}
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void Routines::GenConstants() {
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const_FloatNegativeZero32 = AlignCode16();
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Write32(0x80000000u);
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const_FloatNaN32 = AlignCode16();
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Write32(0x7fc00000u);
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const_FloatNegativeZero64 = AlignCode16();
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Write64(0x8000000000000000u);
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const_FloatNaN64 = AlignCode16();
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Write64(0x7ff8000000000000u);
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const_FloatNonSignMask64 = AlignCode16();
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Write64(0x7fffffffffffffffu);
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const_FloatPenultimatePositiveDenormal64 = AlignCode16();
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Write64(0x000ffffffffffffeu);
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AlignCode16();
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}
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void Routines::GenRunCode() {
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run_code = reinterpret_cast<RunCodeFuncType>(const_cast<u8*>(this->GetCodePtr()));
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// This serves two purposes:
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// 1. It saves all the registers we as a callee need to save.
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// 2. It aligns the stack so that the code the JIT emits can assume
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// that the stack is appropriately aligned for CALLs.
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ABI_PushRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8);
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MOV(64, R(R15), R(ABI_PARAM1));
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MOV(64, MDisp(R15, offsetof(JitState, save_host_RSP)), R(RSP));
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STMXCSR(MDisp(R15, offsetof(JitState, save_host_MXCSR)));
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LDMXCSR(MDisp(R15, offsetof(JitState, guest_MXCSR)));
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JMPptr(R(ABI_PARAM2));
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}
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void Routines::GenReturnFromRunCode(XEmitter* code) const {
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code->STMXCSR(MDisp(R15, offsetof(JitState, guest_MXCSR)));
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code->LDMXCSR(MDisp(R15, offsetof(JitState, save_host_MXCSR)));
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code->MOV(64, R(RSP), MDisp(R15, offsetof(JitState, save_host_RSP)));
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code->ABI_PopRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8);
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code->RET();
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}
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} // namespace BackendX64
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} // namespace Dynarmic
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