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// Copyright 2016 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <initializer_list>
#include <xbyak.h>
#include "common/assert.h"
#include "common/bit_set.h"
namespace Common {
namespace X64 {
int RegToIndex(const Xbyak::Reg& reg) {
using Kind = Xbyak::Reg::Kind;
ASSERT_MSG((reg.getKind() & (Kind::REG | Kind::XMM)) != 0,
"RegSet only support GPRs and XMM registers.");
ASSERT_MSG(reg.getIdx() < 16, "RegSet only supports XXM0-15.");
return reg.getIdx() + (reg.getKind() == Kind::REG ? 0 : 16);
}
inline Xbyak::Reg64 IndexToReg64(int reg_index) {
ASSERT(reg_index < 16);
return Xbyak::Reg64(reg_index);
}
inline Xbyak::Xmm IndexToXmm(int reg_index) {
ASSERT(reg_index >= 16 && reg_index < 32);
return Xbyak::Xmm(reg_index - 16);
}
inline Xbyak::Reg IndexToReg(int reg_index) {
if (reg_index < 16) {
return IndexToReg64(reg_index);
} else {
return IndexToXmm(reg_index);
}
}
inline BitSet32 BuildRegSet(std::initializer_list<Xbyak::Reg> regs) {
BitSet32 bits;
for (const Xbyak::Reg& reg : regs) {
bits[RegToIndex(reg)] = true;
}
return bits;
}
const BitSet32 ABI_ALL_GPRS(0x0000FFFF);
const BitSet32 ABI_ALL_XMMS(0xFFFF0000);
#ifdef _WIN32
// Microsoft x64 ABI
const Xbyak::Reg ABI_RETURN = Xbyak::util::rax;
const Xbyak::Reg ABI_PARAM1 = Xbyak::util::rcx;
const Xbyak::Reg ABI_PARAM2 = Xbyak::util::rdx;
const Xbyak::Reg ABI_PARAM3 = Xbyak::util::r8;
const Xbyak::Reg ABI_PARAM4 = Xbyak::util::r9;
const BitSet32 ABI_ALL_CALLER_SAVED = BuildRegSet({
// GPRs
Xbyak::util::rcx, Xbyak::util::rdx, Xbyak::util::r8, Xbyak::util::r9, Xbyak::util::r10,
Xbyak::util::r11,
// XMMs
Xbyak::util::xmm0, Xbyak::util::xmm1, Xbyak::util::xmm2, Xbyak::util::xmm3, Xbyak::util::xmm4,
Xbyak::util::xmm5,
});
const BitSet32 ABI_ALL_CALLEE_SAVED = BuildRegSet({
// GPRs
Xbyak::util::rbx, Xbyak::util::rsi, Xbyak::util::rdi, Xbyak::util::rbp, Xbyak::util::r12,
Xbyak::util::r13, Xbyak::util::r14, Xbyak::util::r15,
// XMMs
Xbyak::util::xmm6, Xbyak::util::xmm7, Xbyak::util::xmm8, Xbyak::util::xmm9, Xbyak::util::xmm10,
Xbyak::util::xmm11, Xbyak::util::xmm12, Xbyak::util::xmm13, Xbyak::util::xmm14,
Xbyak::util::xmm15,
});
constexpr size_t ABI_SHADOW_SPACE = 0x20;
#else
// System V x86-64 ABI
const Xbyak::Reg ABI_RETURN = Xbyak::util::rax;
const Xbyak::Reg ABI_PARAM1 = Xbyak::util::rdi;
const Xbyak::Reg ABI_PARAM2 = Xbyak::util::rsi;
const Xbyak::Reg ABI_PARAM3 = Xbyak::util::rdx;
const Xbyak::Reg ABI_PARAM4 = Xbyak::util::rcx;
const BitSet32 ABI_ALL_CALLER_SAVED = BuildRegSet({
// GPRs
Xbyak::util::rcx, Xbyak::util::rdx, Xbyak::util::rdi, Xbyak::util::rsi, Xbyak::util::r8,
Xbyak::util::r9, Xbyak::util::r10, Xbyak::util::r11,
// XMMs
Xbyak::util::xmm0, Xbyak::util::xmm1, Xbyak::util::xmm2, Xbyak::util::xmm3, Xbyak::util::xmm4,
Xbyak::util::xmm5, Xbyak::util::xmm6, Xbyak::util::xmm7, Xbyak::util::xmm8, Xbyak::util::xmm9,
Xbyak::util::xmm10, Xbyak::util::xmm11, Xbyak::util::xmm12, Xbyak::util::xmm13,
Xbyak::util::xmm14, Xbyak::util::xmm15,
});
const BitSet32 ABI_ALL_CALLEE_SAVED = BuildRegSet({
// GPRs
Xbyak::util::rbx, Xbyak::util::rbp, Xbyak::util::r12, Xbyak::util::r13, Xbyak::util::r14,
Xbyak::util::r15,
});
constexpr size_t ABI_SHADOW_SPACE = 0;
#endif
void ABI_CalculateFrameSize(BitSet32 regs, size_t rsp_alignment, size_t needed_frame_size,
s32* out_subtraction, s32* out_xmm_offset) {
int count = (regs & ABI_ALL_GPRS).Count();
rsp_alignment -= count * 8;
size_t subtraction = 0;
int xmm_count = (regs & ABI_ALL_XMMS).Count();
if (xmm_count) {
// If we have any XMMs to save, we must align the stack here.
subtraction = rsp_alignment & 0xF;
}
subtraction += 0x10 * xmm_count;
size_t xmm_base_subtraction = subtraction;
subtraction += needed_frame_size;
subtraction += ABI_SHADOW_SPACE;
// Final alignment.
rsp_alignment -= subtraction;
subtraction += rsp_alignment & 0xF;
*out_subtraction = (s32)subtraction;
*out_xmm_offset = (s32)(subtraction - xmm_base_subtraction);
}
size_t ABI_PushRegistersAndAdjustStack(Xbyak::CodeGenerator& code, BitSet32 regs,
size_t rsp_alignment, size_t needed_frame_size = 0) {
s32 subtraction, xmm_offset;
ABI_CalculateFrameSize(regs, rsp_alignment, needed_frame_size, &subtraction, &xmm_offset);
for (int reg_index : (regs & ABI_ALL_GPRS)) {
code.push(IndexToReg64(reg_index));
}
if (subtraction != 0) {
code.sub(code.rsp, subtraction);
}
for (int reg_index : (regs & ABI_ALL_XMMS)) {
code.movaps(code.xword[code.rsp + xmm_offset], IndexToXmm(reg_index));
xmm_offset += 0x10;
}
return ABI_SHADOW_SPACE;
}
void ABI_PopRegistersAndAdjustStack(Xbyak::CodeGenerator& code, BitSet32 regs, size_t rsp_alignment,
size_t needed_frame_size = 0) {
s32 subtraction, xmm_offset;
ABI_CalculateFrameSize(regs, rsp_alignment, needed_frame_size, &subtraction, &xmm_offset);
for (int reg_index : (regs & ABI_ALL_XMMS)) {
code.movaps(IndexToXmm(reg_index), code.xword[code.rsp + xmm_offset]);
xmm_offset += 0x10;
}
if (subtraction != 0) {
code.add(code.rsp, subtraction);
}
// GPRs need to be popped in reverse order
for (int reg_index = 15; reg_index >= 0; reg_index--) {
if (regs[reg_index]) {
code.pop(IndexToReg64(reg_index));
}
}
}
} // namespace X64
} // namespace Common
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