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
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
// 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::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 Common::X64
|