230 lines
6.3 KiB
C++
230 lines
6.3 KiB
C++
// Copyright 2016 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <bitset>
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#include <initializer_list>
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#include <xbyak.h>
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#include "common/assert.h"
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namespace Common::X64 {
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constexpr size_t RegToIndex(const Xbyak::Reg& reg) {
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using Kind = Xbyak::Reg::Kind;
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ASSERT_MSG((reg.getKind() & (Kind::REG | Kind::XMM)) != 0,
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"RegSet only support GPRs and XMM registers.");
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ASSERT_MSG(reg.getIdx() < 16, "RegSet only supports XXM0-15.");
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return static_cast<size_t>(reg.getIdx()) + (reg.getKind() == Kind::REG ? 0 : 16);
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}
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constexpr Xbyak::Reg64 IndexToReg64(size_t reg_index) {
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ASSERT(reg_index < 16);
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return Xbyak::Reg64(static_cast<int>(reg_index));
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}
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constexpr Xbyak::Xmm IndexToXmm(size_t reg_index) {
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ASSERT(reg_index >= 16 && reg_index < 32);
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return Xbyak::Xmm(static_cast<int>(reg_index - 16));
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}
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constexpr Xbyak::Reg IndexToReg(size_t reg_index) {
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if (reg_index < 16) {
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return IndexToReg64(reg_index);
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} else {
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return IndexToXmm(reg_index);
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}
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}
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inline std::bitset<32> BuildRegSet(std::initializer_list<Xbyak::Reg> regs) {
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std::bitset<32> bits;
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for (const Xbyak::Reg& reg : regs) {
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bits[RegToIndex(reg)] = true;
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}
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return bits;
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}
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constexpr inline std::bitset<32> ABI_ALL_GPRS(0x0000FFFF);
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constexpr inline std::bitset<32> ABI_ALL_XMMS(0xFFFF0000);
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#ifdef _WIN32
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// Microsoft x64 ABI
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constexpr inline Xbyak::Reg ABI_RETURN = Xbyak::util::rax;
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constexpr inline Xbyak::Reg ABI_PARAM1 = Xbyak::util::rcx;
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constexpr inline Xbyak::Reg ABI_PARAM2 = Xbyak::util::rdx;
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constexpr inline Xbyak::Reg ABI_PARAM3 = Xbyak::util::r8;
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constexpr inline Xbyak::Reg ABI_PARAM4 = Xbyak::util::r9;
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const std::bitset<32> ABI_ALL_CALLER_SAVED = BuildRegSet({
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// GPRs
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Xbyak::util::rcx,
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Xbyak::util::rdx,
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Xbyak::util::r8,
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Xbyak::util::r9,
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Xbyak::util::r10,
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Xbyak::util::r11,
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// XMMs
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Xbyak::util::xmm0,
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Xbyak::util::xmm1,
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Xbyak::util::xmm2,
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Xbyak::util::xmm3,
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Xbyak::util::xmm4,
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Xbyak::util::xmm5,
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});
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const std::bitset<32> ABI_ALL_CALLEE_SAVED = BuildRegSet({
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// GPRs
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Xbyak::util::rbx,
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Xbyak::util::rsi,
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Xbyak::util::rdi,
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Xbyak::util::rbp,
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Xbyak::util::r12,
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Xbyak::util::r13,
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Xbyak::util::r14,
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Xbyak::util::r15,
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// XMMs
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Xbyak::util::xmm6,
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Xbyak::util::xmm7,
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Xbyak::util::xmm8,
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Xbyak::util::xmm9,
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Xbyak::util::xmm10,
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Xbyak::util::xmm11,
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Xbyak::util::xmm12,
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Xbyak::util::xmm13,
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Xbyak::util::xmm14,
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Xbyak::util::xmm15,
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});
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constexpr size_t ABI_SHADOW_SPACE = 0x20;
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#else
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// System V x86-64 ABI
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constexpr inline Xbyak::Reg ABI_RETURN = Xbyak::util::rax;
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constexpr inline Xbyak::Reg ABI_PARAM1 = Xbyak::util::rdi;
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constexpr inline Xbyak::Reg ABI_PARAM2 = Xbyak::util::rsi;
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constexpr inline Xbyak::Reg ABI_PARAM3 = Xbyak::util::rdx;
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constexpr inline Xbyak::Reg ABI_PARAM4 = Xbyak::util::rcx;
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const std::bitset<32> ABI_ALL_CALLER_SAVED = BuildRegSet({
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// GPRs
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Xbyak::util::rcx,
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Xbyak::util::rdx,
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Xbyak::util::rdi,
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Xbyak::util::rsi,
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Xbyak::util::r8,
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Xbyak::util::r9,
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Xbyak::util::r10,
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Xbyak::util::r11,
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// XMMs
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Xbyak::util::xmm0,
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Xbyak::util::xmm1,
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Xbyak::util::xmm2,
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Xbyak::util::xmm3,
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Xbyak::util::xmm4,
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Xbyak::util::xmm5,
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Xbyak::util::xmm6,
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Xbyak::util::xmm7,
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Xbyak::util::xmm8,
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Xbyak::util::xmm9,
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Xbyak::util::xmm10,
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Xbyak::util::xmm11,
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Xbyak::util::xmm12,
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Xbyak::util::xmm13,
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Xbyak::util::xmm14,
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Xbyak::util::xmm15,
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});
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const std::bitset<32> ABI_ALL_CALLEE_SAVED = BuildRegSet({
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// GPRs
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Xbyak::util::rbx,
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Xbyak::util::rbp,
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Xbyak::util::r12,
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Xbyak::util::r13,
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Xbyak::util::r14,
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Xbyak::util::r15,
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});
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constexpr size_t ABI_SHADOW_SPACE = 0;
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#endif
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struct ABIFrameInfo {
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s32 subtraction;
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s32 xmm_offset;
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};
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inline ABIFrameInfo ABI_CalculateFrameSize(std::bitset<32> regs, size_t rsp_alignment,
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size_t needed_frame_size) {
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const auto count = (regs & ABI_ALL_GPRS).count();
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rsp_alignment -= count * 8;
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size_t subtraction = 0;
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const auto xmm_count = (regs & ABI_ALL_XMMS).count();
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if (xmm_count) {
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// If we have any XMMs to save, we must align the stack here.
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subtraction = rsp_alignment & 0xF;
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}
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subtraction += 0x10 * xmm_count;
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size_t xmm_base_subtraction = subtraction;
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subtraction += needed_frame_size;
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subtraction += ABI_SHADOW_SPACE;
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// Final alignment.
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rsp_alignment -= subtraction;
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subtraction += rsp_alignment & 0xF;
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return ABIFrameInfo{static_cast<s32>(subtraction),
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static_cast<s32>(subtraction - xmm_base_subtraction)};
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}
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inline size_t ABI_PushRegistersAndAdjustStack(Xbyak::CodeGenerator& code, std::bitset<32> regs,
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size_t rsp_alignment, size_t needed_frame_size = 0) {
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auto frame_info = ABI_CalculateFrameSize(regs, rsp_alignment, needed_frame_size);
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for (size_t i = 0; i < regs.size(); ++i) {
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if (regs[i] && ABI_ALL_GPRS[i]) {
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code.push(IndexToReg64(i));
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}
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}
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if (frame_info.subtraction != 0) {
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code.sub(code.rsp, frame_info.subtraction);
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}
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for (size_t i = 0; i < regs.size(); ++i) {
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if (regs[i] && ABI_ALL_XMMS[i]) {
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code.movaps(code.xword[code.rsp + frame_info.xmm_offset], IndexToXmm(i));
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frame_info.xmm_offset += 0x10;
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}
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}
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return ABI_SHADOW_SPACE;
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}
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inline void ABI_PopRegistersAndAdjustStack(Xbyak::CodeGenerator& code, std::bitset<32> regs,
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size_t rsp_alignment, size_t needed_frame_size = 0) {
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auto frame_info = ABI_CalculateFrameSize(regs, rsp_alignment, needed_frame_size);
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for (size_t i = 0; i < regs.size(); ++i) {
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if (regs[i] && ABI_ALL_XMMS[i]) {
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code.movaps(IndexToXmm(i), code.xword[code.rsp + frame_info.xmm_offset]);
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frame_info.xmm_offset += 0x10;
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}
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}
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if (frame_info.subtraction != 0) {
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code.add(code.rsp, frame_info.subtraction);
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}
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// GPRs need to be popped in reverse order
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for (size_t j = 0; j < regs.size(); ++j) {
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const size_t i = regs.size() - j - 1;
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if (regs[i] && ABI_ALL_GPRS[i]) {
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code.pop(IndexToReg64(i));
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}
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}
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}
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} // namespace Common::X64
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