File size: 6,203 Bytes
034d0a2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 | // Copyright 2023 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include "common/arch.h"
#if CITRA_ARCH(arm64)
#include <bitset>
#include <initializer_list>
#include <oaknut/oaknut.hpp>
#include "common/assert.h"
namespace Common::A64 {
constexpr std::size_t RegToIndex(const oaknut::Reg& reg) {
ASSERT(reg.index() != 31); // ZR not allowed
return reg.index() + (reg.is_vector() ? 32 : 0);
}
constexpr oaknut::XReg IndexToXReg(std::size_t reg_index) {
ASSERT(reg_index <= 30);
return oaknut::XReg(static_cast<int>(reg_index));
}
constexpr oaknut::VReg IndexToVReg(std::size_t reg_index) {
ASSERT(reg_index >= 32 && reg_index < 64);
return oaknut::QReg(static_cast<int>(reg_index - 32));
}
constexpr oaknut::Reg IndexToReg(std::size_t reg_index) {
if (reg_index < 32) {
return IndexToXReg(reg_index);
} else {
return IndexToVReg(reg_index);
}
}
inline constexpr std::bitset<64> BuildRegSet(std::initializer_list<oaknut::Reg> regs) {
std::bitset<64> bits;
for (const oaknut::Reg& reg : regs) {
bits.set(RegToIndex(reg));
}
return bits;
}
constexpr inline std::bitset<64> ABI_ALL_GPRS(0x00000000'7FFFFFFF);
constexpr inline std::bitset<64> ABI_ALL_FPRS(0xFFFFFFFF'00000000);
constexpr inline oaknut::XReg ABI_RETURN = oaknut::util::X0;
constexpr inline oaknut::XReg ABI_PARAM1 = oaknut::util::X0;
constexpr inline oaknut::XReg ABI_PARAM2 = oaknut::util::X1;
constexpr inline oaknut::XReg ABI_PARAM3 = oaknut::util::X2;
constexpr inline oaknut::XReg ABI_PARAM4 = oaknut::util::X3;
constexpr std::bitset<64> ABI_ALL_CALLER_SAVED = 0xffffffff'4000ffff;
constexpr std::bitset<64> ABI_ALL_CALLEE_SAVED = 0x0000ff00'7ff80000;
struct ABIFrameInfo {
u32 subtraction;
u32 fprs_offset;
};
inline ABIFrameInfo ABI_CalculateFrameSize(std::bitset<64> regs, std::size_t frame_size) {
const std::size_t gprs_count = (regs & ABI_ALL_GPRS).count();
const std::size_t fprs_count = (regs & ABI_ALL_FPRS).count();
const std::size_t gprs_size = (gprs_count + 1) / 2 * 16;
const std::size_t fprs_size = fprs_count * 16;
std::size_t total_size = 0;
total_size += gprs_size;
const std::size_t fprs_base_subtraction = total_size;
total_size += fprs_size;
total_size += frame_size;
return ABIFrameInfo{static_cast<u32>(total_size), static_cast<u32>(fprs_base_subtraction)};
}
inline void ABI_PushRegisters(oaknut::CodeGenerator& code, std::bitset<64> regs,
std::size_t frame_size = 0) {
using namespace oaknut;
using namespace oaknut::util;
auto frame_info = ABI_CalculateFrameSize(regs, frame_size);
// Allocate stack-space
if (frame_info.subtraction != 0) {
code.SUB(SP, SP, frame_info.subtraction);
}
{
const std::bitset<64> gprs_mask = (regs & ABI_ALL_GPRS);
std::vector<XReg> gprs;
gprs.reserve(32);
for (u8 i = 0; i < 32; ++i) {
if (gprs_mask.test(i)) {
gprs.emplace_back(IndexToXReg(i));
}
}
if (!gprs.empty()) {
for (std::size_t i = 0; i < gprs.size() - 1; i += 2) {
code.STP(gprs[i], gprs[i + 1], SP, i * sizeof(u64));
}
if (gprs.size() % 2 == 1) {
const std::size_t i = gprs.size() - 1;
code.STR(gprs[i], SP, i * sizeof(u64));
}
}
}
{
const std::bitset<64> fprs_mask = (regs & ABI_ALL_FPRS);
std::vector<QReg> fprs;
fprs.reserve(32);
for (u8 i = 32; i < 64; ++i) {
if (fprs_mask.test(i)) {
fprs.emplace_back(IndexToVReg(i).toQ());
}
}
if (!fprs.empty()) {
for (std::size_t i = 0; i < fprs.size() - 1; i += 2) {
code.STP(fprs[i], fprs[i + 1], SP, frame_info.fprs_offset + i * (sizeof(u64) * 2));
}
if (fprs.size() % 2 == 1) {
const std::size_t i = fprs.size() - 1;
code.STR(fprs[i], SP, frame_info.fprs_offset + i * (sizeof(u64) * 2));
}
}
}
// Allocate frame-space
if (frame_size != 0) {
code.SUB(SP, SP, frame_size);
}
}
inline void ABI_PopRegisters(oaknut::CodeGenerator& code, std::bitset<64> regs,
std::size_t frame_size = 0) {
using namespace oaknut;
using namespace oaknut::util;
auto frame_info = ABI_CalculateFrameSize(regs, frame_size);
// Free frame-space
if (frame_size != 0) {
code.ADD(SP, SP, frame_size);
}
{
const std::bitset<64> gprs_mask = (regs & ABI_ALL_GPRS);
std::vector<XReg> gprs;
gprs.reserve(32);
for (u8 i = 0; i < 32; ++i) {
if (gprs_mask.test(i)) {
gprs.emplace_back(IndexToXReg(i));
}
}
if (!gprs.empty()) {
for (std::size_t i = 0; i < gprs.size() - 1; i += 2) {
code.LDP(gprs[i], gprs[i + 1], SP, i * sizeof(u64));
}
if (gprs.size() % 2 == 1) {
const std::size_t i = gprs.size() - 1;
code.LDR(gprs[i], SP, i * sizeof(u64));
}
}
}
{
const std::bitset<64> fprs_mask = (regs & ABI_ALL_FPRS);
std::vector<QReg> fprs;
fprs.reserve(32);
for (u8 i = 32; i < 64; ++i) {
if (fprs_mask.test(i)) {
fprs.emplace_back(IndexToVReg(i).toQ());
}
}
if (!fprs.empty()) {
for (std::size_t i = 0; i < fprs.size() - 1; i += 2) {
code.LDP(fprs[i], fprs[i + 1], SP, frame_info.fprs_offset + i * (sizeof(u64) * 2));
}
if (fprs.size() % 2 == 1) {
const std::size_t i = fprs.size() - 1;
code.LDR(fprs[i], SP, frame_info.fprs_offset + i * (sizeof(u64) * 2));
}
}
}
// Free stack-space
if (frame_info.subtraction != 0) {
code.ADD(SP, SP, frame_info.subtraction);
}
}
} // namespace Common::A64
#endif // CITRA_ARCH(arm64)
|