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6aa8b732 AK |
1 | /****************************************************************************** |
2 | * x86_emulate.c | |
3 | * | |
4 | * Generic x86 (32-bit and 64-bit) instruction decoder and emulator. | |
5 | * | |
6 | * Copyright (c) 2005 Keir Fraser | |
7 | * | |
8 | * Linux coding style, mod r/m decoder, segment base fixes, real-mode | |
dcc0766b | 9 | * privileged instructions: |
6aa8b732 AK |
10 | * |
11 | * Copyright (C) 2006 Qumranet | |
12 | * | |
13 | * Avi Kivity <avi@qumranet.com> | |
14 | * Yaniv Kamay <yaniv@qumranet.com> | |
15 | * | |
16 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
17 | * the COPYING file in the top-level directory. | |
18 | * | |
19 | * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4 | |
20 | */ | |
21 | ||
22 | #ifndef __KERNEL__ | |
23 | #include <stdio.h> | |
24 | #include <stdint.h> | |
25 | #include <public/xen.h> | |
d77c26fc | 26 | #define DPRINTF(_f, _a ...) printf(_f , ## _a) |
6aa8b732 | 27 | #else |
edf88417 | 28 | #include <linux/kvm_host.h> |
6aa8b732 AK |
29 | #define DPRINTF(x...) do {} while (0) |
30 | #endif | |
6aa8b732 | 31 | #include <linux/module.h> |
edf88417 | 32 | #include <asm/kvm_x86_emulate.h> |
6aa8b732 AK |
33 | |
34 | /* | |
35 | * Opcode effective-address decode tables. | |
36 | * Note that we only emulate instructions that have at least one memory | |
37 | * operand (excluding implicit stack references). We assume that stack | |
38 | * references and instruction fetches will never occur in special memory | |
39 | * areas that require emulation. So, for example, 'mov <imm>,<reg>' need | |
40 | * not be handled. | |
41 | */ | |
42 | ||
43 | /* Operand sizes: 8-bit operands or specified/overridden size. */ | |
44 | #define ByteOp (1<<0) /* 8-bit operands. */ | |
45 | /* Destination operand type. */ | |
46 | #define ImplicitOps (1<<1) /* Implicit in opcode. No generic decode. */ | |
47 | #define DstReg (2<<1) /* Register operand. */ | |
48 | #define DstMem (3<<1) /* Memory operand. */ | |
49 | #define DstMask (3<<1) | |
50 | /* Source operand type. */ | |
51 | #define SrcNone (0<<3) /* No source operand. */ | |
52 | #define SrcImplicit (0<<3) /* Source operand is implicit in the opcode. */ | |
53 | #define SrcReg (1<<3) /* Register operand. */ | |
54 | #define SrcMem (2<<3) /* Memory operand. */ | |
55 | #define SrcMem16 (3<<3) /* Memory operand (16-bit). */ | |
56 | #define SrcMem32 (4<<3) /* Memory operand (32-bit). */ | |
57 | #define SrcImm (5<<3) /* Immediate operand. */ | |
58 | #define SrcImmByte (6<<3) /* 8-bit sign-extended immediate operand. */ | |
59 | #define SrcMask (7<<3) | |
60 | /* Generic ModRM decode. */ | |
61 | #define ModRM (1<<6) | |
62 | /* Destination is only written; never read. */ | |
63 | #define Mov (1<<7) | |
038e51de | 64 | #define BitOp (1<<8) |
c7e75a3d | 65 | #define MemAbs (1<<9) /* Memory operand is absolute displacement */ |
b9fa9d6b | 66 | #define String (1<<10) /* String instruction (rep capable) */ |
6e3d5dfb | 67 | #define Stack (1<<11) /* Stack instruction (push/pop) */ |
e09d082c AK |
68 | #define Group (1<<14) /* Bits 3:5 of modrm byte extend opcode */ |
69 | #define GroupDual (1<<15) /* Alternate decoding of mod == 3 */ | |
70 | #define GroupMask 0xff /* Group number stored in bits 0:7 */ | |
6aa8b732 | 71 | |
43bb19cd | 72 | enum { |
1d6ad207 | 73 | Group1_80, Group1_81, Group1_82, Group1_83, |
d95058a1 | 74 | Group1A, Group3_Byte, Group3, Group4, Group5, Group7, |
43bb19cd AK |
75 | }; |
76 | ||
c7e75a3d | 77 | static u16 opcode_table[256] = { |
6aa8b732 AK |
78 | /* 0x00 - 0x07 */ |
79 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
80 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
81 | 0, 0, 0, 0, | |
82 | /* 0x08 - 0x0F */ | |
83 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
84 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
85 | 0, 0, 0, 0, | |
86 | /* 0x10 - 0x17 */ | |
87 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
88 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
89 | 0, 0, 0, 0, | |
90 | /* 0x18 - 0x1F */ | |
91 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
92 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
93 | 0, 0, 0, 0, | |
94 | /* 0x20 - 0x27 */ | |
95 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
96 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
19eb938e | 97 | SrcImmByte, SrcImm, 0, 0, |
6aa8b732 AK |
98 | /* 0x28 - 0x2F */ |
99 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
100 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
101 | 0, 0, 0, 0, | |
102 | /* 0x30 - 0x37 */ | |
103 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
104 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
105 | 0, 0, 0, 0, | |
106 | /* 0x38 - 0x3F */ | |
107 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
108 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
109 | 0, 0, 0, 0, | |
d77a2507 | 110 | /* 0x40 - 0x47 */ |
33615aa9 | 111 | DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, |
d77a2507 | 112 | /* 0x48 - 0x4F */ |
33615aa9 | 113 | DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, |
7f0aaee0 | 114 | /* 0x50 - 0x57 */ |
6e3d5dfb AK |
115 | SrcReg | Stack, SrcReg | Stack, SrcReg | Stack, SrcReg | Stack, |
116 | SrcReg | Stack, SrcReg | Stack, SrcReg | Stack, SrcReg | Stack, | |
7f0aaee0 | 117 | /* 0x58 - 0x5F */ |
6e3d5dfb AK |
118 | DstReg | Stack, DstReg | Stack, DstReg | Stack, DstReg | Stack, |
119 | DstReg | Stack, DstReg | Stack, DstReg | Stack, DstReg | Stack, | |
7d316911 | 120 | /* 0x60 - 0x67 */ |
6aa8b732 | 121 | 0, 0, 0, DstReg | SrcMem32 | ModRM | Mov /* movsxd (x86/64) */ , |
7d316911 NK |
122 | 0, 0, 0, 0, |
123 | /* 0x68 - 0x6F */ | |
91ed7a0e | 124 | SrcImm | Mov | Stack, 0, SrcImmByte | Mov | Stack, 0, |
e70669ab LV |
125 | SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps, /* insb, insw/insd */ |
126 | SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps, /* outsb, outsw/outsd */ | |
55bebde4 NK |
127 | /* 0x70 - 0x77 */ |
128 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
129 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
130 | /* 0x78 - 0x7F */ | |
131 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
132 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
6aa8b732 | 133 | /* 0x80 - 0x87 */ |
1d6ad207 AK |
134 | Group | Group1_80, Group | Group1_81, |
135 | Group | Group1_82, Group | Group1_83, | |
6aa8b732 AK |
136 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, |
137 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
138 | /* 0x88 - 0x8F */ | |
139 | ByteOp | DstMem | SrcReg | ModRM | Mov, DstMem | SrcReg | ModRM | Mov, | |
140 | ByteOp | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
38d5bc6d | 141 | DstMem | SrcReg | ModRM | Mov, ModRM | DstReg, |
4257198a | 142 | DstReg | SrcMem | ModRM | Mov, Group | Group1A, |
b13354f8 MG |
143 | /* 0x90 - 0x97 */ |
144 | DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, | |
145 | /* 0x98 - 0x9F */ | |
6e3d5dfb | 146 | 0, 0, 0, 0, ImplicitOps | Stack, ImplicitOps | Stack, 0, 0, |
6aa8b732 | 147 | /* 0xA0 - 0xA7 */ |
c7e75a3d AK |
148 | ByteOp | DstReg | SrcMem | Mov | MemAbs, DstReg | SrcMem | Mov | MemAbs, |
149 | ByteOp | DstMem | SrcReg | Mov | MemAbs, DstMem | SrcReg | Mov | MemAbs, | |
b9fa9d6b AK |
150 | ByteOp | ImplicitOps | Mov | String, ImplicitOps | Mov | String, |
151 | ByteOp | ImplicitOps | String, ImplicitOps | String, | |
6aa8b732 | 152 | /* 0xA8 - 0xAF */ |
b9fa9d6b AK |
153 | 0, 0, ByteOp | ImplicitOps | Mov | String, ImplicitOps | Mov | String, |
154 | ByteOp | ImplicitOps | Mov | String, ImplicitOps | Mov | String, | |
155 | ByteOp | ImplicitOps | String, ImplicitOps | String, | |
6aa8b732 | 156 | /* 0xB0 - 0xBF */ |
615ac125 GT |
157 | 0, 0, 0, 0, 0, 0, 0, 0, |
158 | DstReg | SrcImm | Mov, 0, 0, 0, 0, 0, 0, 0, | |
6aa8b732 | 159 | /* 0xC0 - 0xC7 */ |
d9413cd7 | 160 | ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImmByte | ModRM, |
6e3d5dfb | 161 | 0, ImplicitOps | Stack, 0, 0, |
d9413cd7 | 162 | ByteOp | DstMem | SrcImm | ModRM | Mov, DstMem | SrcImm | ModRM | Mov, |
6aa8b732 AK |
163 | /* 0xC8 - 0xCF */ |
164 | 0, 0, 0, 0, 0, 0, 0, 0, | |
165 | /* 0xD0 - 0xD7 */ | |
166 | ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM, | |
167 | ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM, | |
168 | 0, 0, 0, 0, | |
169 | /* 0xD8 - 0xDF */ | |
170 | 0, 0, 0, 0, 0, 0, 0, 0, | |
098c937b NK |
171 | /* 0xE0 - 0xE7 */ |
172 | 0, 0, 0, 0, 0, 0, 0, 0, | |
173 | /* 0xE8 - 0xEF */ | |
954cd36f GT |
174 | ImplicitOps | Stack, SrcImm | ImplicitOps, |
175 | ImplicitOps, SrcImmByte | ImplicitOps, | |
6e3d5dfb | 176 | 0, 0, 0, 0, |
6aa8b732 AK |
177 | /* 0xF0 - 0xF7 */ |
178 | 0, 0, 0, 0, | |
7d858a19 | 179 | ImplicitOps, ImplicitOps, Group | Group3_Byte, Group | Group3, |
6aa8b732 | 180 | /* 0xF8 - 0xFF */ |
b284be57 | 181 | ImplicitOps, 0, ImplicitOps, ImplicitOps, |
fd60754e | 182 | 0, 0, Group | Group4, Group | Group5, |
6aa8b732 AK |
183 | }; |
184 | ||
038e51de | 185 | static u16 twobyte_table[256] = { |
6aa8b732 | 186 | /* 0x00 - 0x0F */ |
d95058a1 | 187 | 0, Group | GroupDual | Group7, 0, 0, 0, 0, ImplicitOps, 0, |
651a3e29 | 188 | ImplicitOps, ImplicitOps, 0, 0, 0, ImplicitOps | ModRM, 0, 0, |
6aa8b732 AK |
189 | /* 0x10 - 0x1F */ |
190 | 0, 0, 0, 0, 0, 0, 0, 0, ImplicitOps | ModRM, 0, 0, 0, 0, 0, 0, 0, | |
191 | /* 0x20 - 0x2F */ | |
192 | ModRM | ImplicitOps, ModRM, ModRM | ImplicitOps, ModRM, 0, 0, 0, 0, | |
193 | 0, 0, 0, 0, 0, 0, 0, 0, | |
194 | /* 0x30 - 0x3F */ | |
35f3f286 | 195 | ImplicitOps, 0, ImplicitOps, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
6aa8b732 AK |
196 | /* 0x40 - 0x47 */ |
197 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
198 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
199 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
200 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
201 | /* 0x48 - 0x4F */ | |
202 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
203 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
204 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
205 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
206 | /* 0x50 - 0x5F */ | |
207 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
208 | /* 0x60 - 0x6F */ | |
209 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
210 | /* 0x70 - 0x7F */ | |
211 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
212 | /* 0x80 - 0x8F */ | |
bbe9abbd NK |
213 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, |
214 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
215 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
216 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
6aa8b732 AK |
217 | /* 0x90 - 0x9F */ |
218 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
219 | /* 0xA0 - 0xA7 */ | |
038e51de | 220 | 0, 0, 0, DstMem | SrcReg | ModRM | BitOp, 0, 0, 0, 0, |
6aa8b732 | 221 | /* 0xA8 - 0xAF */ |
038e51de | 222 | 0, 0, 0, DstMem | SrcReg | ModRM | BitOp, 0, 0, 0, 0, |
6aa8b732 AK |
223 | /* 0xB0 - 0xB7 */ |
224 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, 0, | |
038e51de | 225 | DstMem | SrcReg | ModRM | BitOp, |
6aa8b732 AK |
226 | 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov, |
227 | DstReg | SrcMem16 | ModRM | Mov, | |
228 | /* 0xB8 - 0xBF */ | |
038e51de | 229 | 0, 0, DstMem | SrcImmByte | ModRM, DstMem | SrcReg | ModRM | BitOp, |
6aa8b732 AK |
230 | 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov, |
231 | DstReg | SrcMem16 | ModRM | Mov, | |
232 | /* 0xC0 - 0xCF */ | |
a012e65a SY |
233 | 0, 0, 0, DstMem | SrcReg | ModRM | Mov, 0, 0, 0, ImplicitOps | ModRM, |
234 | 0, 0, 0, 0, 0, 0, 0, 0, | |
6aa8b732 AK |
235 | /* 0xD0 - 0xDF */ |
236 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
237 | /* 0xE0 - 0xEF */ | |
238 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
239 | /* 0xF0 - 0xFF */ | |
240 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
241 | }; | |
242 | ||
e09d082c | 243 | static u16 group_table[] = { |
1d6ad207 AK |
244 | [Group1_80*8] = |
245 | ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM, | |
246 | ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM, | |
247 | ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM, | |
248 | ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM, | |
249 | [Group1_81*8] = | |
250 | DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM, | |
251 | DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM, | |
252 | DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM, | |
253 | DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM, | |
254 | [Group1_82*8] = | |
255 | ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM, | |
256 | ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM, | |
257 | ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM, | |
258 | ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM, | |
259 | [Group1_83*8] = | |
260 | DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM, | |
261 | DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM, | |
262 | DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM, | |
263 | DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM, | |
43bb19cd AK |
264 | [Group1A*8] = |
265 | DstMem | SrcNone | ModRM | Mov | Stack, 0, 0, 0, 0, 0, 0, 0, | |
7d858a19 AK |
266 | [Group3_Byte*8] = |
267 | ByteOp | SrcImm | DstMem | ModRM, 0, | |
268 | ByteOp | DstMem | SrcNone | ModRM, ByteOp | DstMem | SrcNone | ModRM, | |
269 | 0, 0, 0, 0, | |
270 | [Group3*8] = | |
271 | DstMem | SrcImm | ModRM | SrcImm, 0, | |
272 | DstMem | SrcNone | ModRM, ByteOp | DstMem | SrcNone | ModRM, | |
273 | 0, 0, 0, 0, | |
fd60754e AK |
274 | [Group4*8] = |
275 | ByteOp | DstMem | SrcNone | ModRM, ByteOp | DstMem | SrcNone | ModRM, | |
276 | 0, 0, 0, 0, 0, 0, | |
277 | [Group5*8] = | |
278 | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM, 0, 0, | |
279 | SrcMem | ModRM, 0, SrcMem | ModRM | Stack, 0, | |
d95058a1 AK |
280 | [Group7*8] = |
281 | 0, 0, ModRM | SrcMem, ModRM | SrcMem, | |
16286d08 AK |
282 | SrcNone | ModRM | DstMem | Mov, 0, |
283 | SrcMem16 | ModRM | Mov, SrcMem | ModRM | ByteOp, | |
e09d082c AK |
284 | }; |
285 | ||
286 | static u16 group2_table[] = { | |
d95058a1 | 287 | [Group7*8] = |
16286d08 AK |
288 | SrcNone | ModRM, 0, 0, 0, |
289 | SrcNone | ModRM | DstMem | Mov, 0, | |
290 | SrcMem16 | ModRM | Mov, 0, | |
e09d082c AK |
291 | }; |
292 | ||
6aa8b732 AK |
293 | /* EFLAGS bit definitions. */ |
294 | #define EFLG_OF (1<<11) | |
295 | #define EFLG_DF (1<<10) | |
296 | #define EFLG_SF (1<<7) | |
297 | #define EFLG_ZF (1<<6) | |
298 | #define EFLG_AF (1<<4) | |
299 | #define EFLG_PF (1<<2) | |
300 | #define EFLG_CF (1<<0) | |
301 | ||
302 | /* | |
303 | * Instruction emulation: | |
304 | * Most instructions are emulated directly via a fragment of inline assembly | |
305 | * code. This allows us to save/restore EFLAGS and thus very easily pick up | |
306 | * any modified flags. | |
307 | */ | |
308 | ||
05b3e0c2 | 309 | #if defined(CONFIG_X86_64) |
6aa8b732 AK |
310 | #define _LO32 "k" /* force 32-bit operand */ |
311 | #define _STK "%%rsp" /* stack pointer */ | |
312 | #elif defined(__i386__) | |
313 | #define _LO32 "" /* force 32-bit operand */ | |
314 | #define _STK "%%esp" /* stack pointer */ | |
315 | #endif | |
316 | ||
317 | /* | |
318 | * These EFLAGS bits are restored from saved value during emulation, and | |
319 | * any changes are written back to the saved value after emulation. | |
320 | */ | |
321 | #define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF) | |
322 | ||
323 | /* Before executing instruction: restore necessary bits in EFLAGS. */ | |
e934c9c1 AK |
324 | #define _PRE_EFLAGS(_sav, _msk, _tmp) \ |
325 | /* EFLAGS = (_sav & _msk) | (EFLAGS & ~_msk); _sav &= ~_msk; */ \ | |
326 | "movl %"_sav",%"_LO32 _tmp"; " \ | |
327 | "push %"_tmp"; " \ | |
328 | "push %"_tmp"; " \ | |
329 | "movl %"_msk",%"_LO32 _tmp"; " \ | |
330 | "andl %"_LO32 _tmp",("_STK"); " \ | |
331 | "pushf; " \ | |
332 | "notl %"_LO32 _tmp"; " \ | |
333 | "andl %"_LO32 _tmp",("_STK"); " \ | |
334 | "andl %"_LO32 _tmp","__stringify(BITS_PER_LONG/4)"("_STK"); " \ | |
335 | "pop %"_tmp"; " \ | |
336 | "orl %"_LO32 _tmp",("_STK"); " \ | |
337 | "popf; " \ | |
338 | "pop %"_sav"; " | |
6aa8b732 AK |
339 | |
340 | /* After executing instruction: write-back necessary bits in EFLAGS. */ | |
341 | #define _POST_EFLAGS(_sav, _msk, _tmp) \ | |
342 | /* _sav |= EFLAGS & _msk; */ \ | |
343 | "pushf; " \ | |
344 | "pop %"_tmp"; " \ | |
345 | "andl %"_msk",%"_LO32 _tmp"; " \ | |
346 | "orl %"_LO32 _tmp",%"_sav"; " | |
347 | ||
348 | /* Raw emulation: instruction has two explicit operands. */ | |
349 | #define __emulate_2op_nobyte(_op,_src,_dst,_eflags,_wx,_wy,_lx,_ly,_qx,_qy) \ | |
350 | do { \ | |
351 | unsigned long _tmp; \ | |
352 | \ | |
353 | switch ((_dst).bytes) { \ | |
354 | case 2: \ | |
355 | __asm__ __volatile__ ( \ | |
d77c26fc | 356 | _PRE_EFLAGS("0", "4", "2") \ |
6aa8b732 | 357 | _op"w %"_wx"3,%1; " \ |
d77c26fc | 358 | _POST_EFLAGS("0", "4", "2") \ |
6aa8b732 AK |
359 | : "=m" (_eflags), "=m" ((_dst).val), \ |
360 | "=&r" (_tmp) \ | |
d77c26fc | 361 | : _wy ((_src).val), "i" (EFLAGS_MASK)); \ |
6aa8b732 AK |
362 | break; \ |
363 | case 4: \ | |
364 | __asm__ __volatile__ ( \ | |
d77c26fc | 365 | _PRE_EFLAGS("0", "4", "2") \ |
6aa8b732 | 366 | _op"l %"_lx"3,%1; " \ |
d77c26fc | 367 | _POST_EFLAGS("0", "4", "2") \ |
6aa8b732 AK |
368 | : "=m" (_eflags), "=m" ((_dst).val), \ |
369 | "=&r" (_tmp) \ | |
d77c26fc | 370 | : _ly ((_src).val), "i" (EFLAGS_MASK)); \ |
6aa8b732 AK |
371 | break; \ |
372 | case 8: \ | |
373 | __emulate_2op_8byte(_op, _src, _dst, \ | |
374 | _eflags, _qx, _qy); \ | |
375 | break; \ | |
376 | } \ | |
377 | } while (0) | |
378 | ||
379 | #define __emulate_2op(_op,_src,_dst,_eflags,_bx,_by,_wx,_wy,_lx,_ly,_qx,_qy) \ | |
380 | do { \ | |
77cd337f | 381 | unsigned long __tmp; \ |
d77c26fc | 382 | switch ((_dst).bytes) { \ |
6aa8b732 AK |
383 | case 1: \ |
384 | __asm__ __volatile__ ( \ | |
d77c26fc | 385 | _PRE_EFLAGS("0", "4", "2") \ |
6aa8b732 | 386 | _op"b %"_bx"3,%1; " \ |
d77c26fc | 387 | _POST_EFLAGS("0", "4", "2") \ |
6aa8b732 | 388 | : "=m" (_eflags), "=m" ((_dst).val), \ |
77cd337f | 389 | "=&r" (__tmp) \ |
d77c26fc | 390 | : _by ((_src).val), "i" (EFLAGS_MASK)); \ |
6aa8b732 AK |
391 | break; \ |
392 | default: \ | |
393 | __emulate_2op_nobyte(_op, _src, _dst, _eflags, \ | |
394 | _wx, _wy, _lx, _ly, _qx, _qy); \ | |
395 | break; \ | |
396 | } \ | |
397 | } while (0) | |
398 | ||
399 | /* Source operand is byte-sized and may be restricted to just %cl. */ | |
400 | #define emulate_2op_SrcB(_op, _src, _dst, _eflags) \ | |
401 | __emulate_2op(_op, _src, _dst, _eflags, \ | |
402 | "b", "c", "b", "c", "b", "c", "b", "c") | |
403 | ||
404 | /* Source operand is byte, word, long or quad sized. */ | |
405 | #define emulate_2op_SrcV(_op, _src, _dst, _eflags) \ | |
406 | __emulate_2op(_op, _src, _dst, _eflags, \ | |
407 | "b", "q", "w", "r", _LO32, "r", "", "r") | |
408 | ||
409 | /* Source operand is word, long or quad sized. */ | |
410 | #define emulate_2op_SrcV_nobyte(_op, _src, _dst, _eflags) \ | |
411 | __emulate_2op_nobyte(_op, _src, _dst, _eflags, \ | |
412 | "w", "r", _LO32, "r", "", "r") | |
413 | ||
414 | /* Instruction has only one explicit operand (no source operand). */ | |
415 | #define emulate_1op(_op, _dst, _eflags) \ | |
416 | do { \ | |
417 | unsigned long _tmp; \ | |
418 | \ | |
d77c26fc | 419 | switch ((_dst).bytes) { \ |
6aa8b732 AK |
420 | case 1: \ |
421 | __asm__ __volatile__ ( \ | |
d77c26fc | 422 | _PRE_EFLAGS("0", "3", "2") \ |
6aa8b732 | 423 | _op"b %1; " \ |
d77c26fc | 424 | _POST_EFLAGS("0", "3", "2") \ |
6aa8b732 AK |
425 | : "=m" (_eflags), "=m" ((_dst).val), \ |
426 | "=&r" (_tmp) \ | |
d77c26fc | 427 | : "i" (EFLAGS_MASK)); \ |
6aa8b732 AK |
428 | break; \ |
429 | case 2: \ | |
430 | __asm__ __volatile__ ( \ | |
d77c26fc | 431 | _PRE_EFLAGS("0", "3", "2") \ |
6aa8b732 | 432 | _op"w %1; " \ |
d77c26fc | 433 | _POST_EFLAGS("0", "3", "2") \ |
6aa8b732 AK |
434 | : "=m" (_eflags), "=m" ((_dst).val), \ |
435 | "=&r" (_tmp) \ | |
d77c26fc | 436 | : "i" (EFLAGS_MASK)); \ |
6aa8b732 AK |
437 | break; \ |
438 | case 4: \ | |
439 | __asm__ __volatile__ ( \ | |
d77c26fc | 440 | _PRE_EFLAGS("0", "3", "2") \ |
6aa8b732 | 441 | _op"l %1; " \ |
d77c26fc | 442 | _POST_EFLAGS("0", "3", "2") \ |
6aa8b732 AK |
443 | : "=m" (_eflags), "=m" ((_dst).val), \ |
444 | "=&r" (_tmp) \ | |
d77c26fc | 445 | : "i" (EFLAGS_MASK)); \ |
6aa8b732 AK |
446 | break; \ |
447 | case 8: \ | |
448 | __emulate_1op_8byte(_op, _dst, _eflags); \ | |
449 | break; \ | |
450 | } \ | |
451 | } while (0) | |
452 | ||
453 | /* Emulate an instruction with quadword operands (x86/64 only). */ | |
05b3e0c2 | 454 | #if defined(CONFIG_X86_64) |
6aa8b732 AK |
455 | #define __emulate_2op_8byte(_op, _src, _dst, _eflags, _qx, _qy) \ |
456 | do { \ | |
457 | __asm__ __volatile__ ( \ | |
d77c26fc | 458 | _PRE_EFLAGS("0", "4", "2") \ |
6aa8b732 | 459 | _op"q %"_qx"3,%1; " \ |
d77c26fc | 460 | _POST_EFLAGS("0", "4", "2") \ |
6aa8b732 | 461 | : "=m" (_eflags), "=m" ((_dst).val), "=&r" (_tmp) \ |
d77c26fc | 462 | : _qy ((_src).val), "i" (EFLAGS_MASK)); \ |
6aa8b732 AK |
463 | } while (0) |
464 | ||
465 | #define __emulate_1op_8byte(_op, _dst, _eflags) \ | |
466 | do { \ | |
467 | __asm__ __volatile__ ( \ | |
d77c26fc | 468 | _PRE_EFLAGS("0", "3", "2") \ |
6aa8b732 | 469 | _op"q %1; " \ |
d77c26fc | 470 | _POST_EFLAGS("0", "3", "2") \ |
6aa8b732 | 471 | : "=m" (_eflags), "=m" ((_dst).val), "=&r" (_tmp) \ |
d77c26fc | 472 | : "i" (EFLAGS_MASK)); \ |
6aa8b732 AK |
473 | } while (0) |
474 | ||
475 | #elif defined(__i386__) | |
476 | #define __emulate_2op_8byte(_op, _src, _dst, _eflags, _qx, _qy) | |
477 | #define __emulate_1op_8byte(_op, _dst, _eflags) | |
478 | #endif /* __i386__ */ | |
479 | ||
480 | /* Fetch next part of the instruction being emulated. */ | |
481 | #define insn_fetch(_type, _size, _eip) \ | |
482 | ({ unsigned long _x; \ | |
62266869 | 483 | rc = do_insn_fetch(ctxt, ops, (_eip), &_x, (_size)); \ |
d77c26fc | 484 | if (rc != 0) \ |
6aa8b732 AK |
485 | goto done; \ |
486 | (_eip) += (_size); \ | |
487 | (_type)_x; \ | |
488 | }) | |
489 | ||
ddcb2885 HH |
490 | static inline unsigned long ad_mask(struct decode_cache *c) |
491 | { | |
492 | return (1UL << (c->ad_bytes << 3)) - 1; | |
493 | } | |
494 | ||
6aa8b732 | 495 | /* Access/update address held in a register, based on addressing mode. */ |
e4706772 HH |
496 | static inline unsigned long |
497 | address_mask(struct decode_cache *c, unsigned long reg) | |
498 | { | |
499 | if (c->ad_bytes == sizeof(unsigned long)) | |
500 | return reg; | |
501 | else | |
502 | return reg & ad_mask(c); | |
503 | } | |
504 | ||
505 | static inline unsigned long | |
506 | register_address(struct decode_cache *c, unsigned long base, unsigned long reg) | |
507 | { | |
508 | return base + address_mask(c, reg); | |
509 | } | |
510 | ||
7a957275 HH |
511 | static inline void |
512 | register_address_increment(struct decode_cache *c, unsigned long *reg, int inc) | |
513 | { | |
514 | if (c->ad_bytes == sizeof(unsigned long)) | |
515 | *reg += inc; | |
516 | else | |
517 | *reg = (*reg & ~ad_mask(c)) | ((*reg + inc) & ad_mask(c)); | |
518 | } | |
6aa8b732 | 519 | |
7a957275 HH |
520 | static inline void jmp_rel(struct decode_cache *c, int rel) |
521 | { | |
522 | register_address_increment(c, &c->eip, rel); | |
523 | } | |
098c937b | 524 | |
7a5b56df AK |
525 | static void set_seg_override(struct decode_cache *c, int seg) |
526 | { | |
527 | c->has_seg_override = true; | |
528 | c->seg_override = seg; | |
529 | } | |
530 | ||
531 | static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg) | |
532 | { | |
533 | if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS) | |
534 | return 0; | |
535 | ||
536 | return kvm_x86_ops->get_segment_base(ctxt->vcpu, seg); | |
537 | } | |
538 | ||
539 | static unsigned long seg_override_base(struct x86_emulate_ctxt *ctxt, | |
540 | struct decode_cache *c) | |
541 | { | |
542 | if (!c->has_seg_override) | |
543 | return 0; | |
544 | ||
545 | return seg_base(ctxt, c->seg_override); | |
546 | } | |
547 | ||
548 | static unsigned long es_base(struct x86_emulate_ctxt *ctxt) | |
549 | { | |
550 | return seg_base(ctxt, VCPU_SREG_ES); | |
551 | } | |
552 | ||
553 | static unsigned long ss_base(struct x86_emulate_ctxt *ctxt) | |
554 | { | |
555 | return seg_base(ctxt, VCPU_SREG_SS); | |
556 | } | |
557 | ||
62266869 AK |
558 | static int do_fetch_insn_byte(struct x86_emulate_ctxt *ctxt, |
559 | struct x86_emulate_ops *ops, | |
560 | unsigned long linear, u8 *dest) | |
561 | { | |
562 | struct fetch_cache *fc = &ctxt->decode.fetch; | |
563 | int rc; | |
564 | int size; | |
565 | ||
566 | if (linear < fc->start || linear >= fc->end) { | |
567 | size = min(15UL, PAGE_SIZE - offset_in_page(linear)); | |
568 | rc = ops->read_std(linear, fc->data, size, ctxt->vcpu); | |
569 | if (rc) | |
570 | return rc; | |
571 | fc->start = linear; | |
572 | fc->end = linear + size; | |
573 | } | |
574 | *dest = fc->data[linear - fc->start]; | |
575 | return 0; | |
576 | } | |
577 | ||
578 | static int do_insn_fetch(struct x86_emulate_ctxt *ctxt, | |
579 | struct x86_emulate_ops *ops, | |
580 | unsigned long eip, void *dest, unsigned size) | |
581 | { | |
582 | int rc = 0; | |
583 | ||
584 | eip += ctxt->cs_base; | |
585 | while (size--) { | |
586 | rc = do_fetch_insn_byte(ctxt, ops, eip++, dest++); | |
587 | if (rc) | |
588 | return rc; | |
589 | } | |
590 | return 0; | |
591 | } | |
592 | ||
1e3c5cb0 RR |
593 | /* |
594 | * Given the 'reg' portion of a ModRM byte, and a register block, return a | |
595 | * pointer into the block that addresses the relevant register. | |
596 | * @highbyte_regs specifies whether to decode AH,CH,DH,BH. | |
597 | */ | |
598 | static void *decode_register(u8 modrm_reg, unsigned long *regs, | |
599 | int highbyte_regs) | |
6aa8b732 AK |
600 | { |
601 | void *p; | |
602 | ||
603 | p = ®s[modrm_reg]; | |
604 | if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8) | |
605 | p = (unsigned char *)®s[modrm_reg & 3] + 1; | |
606 | return p; | |
607 | } | |
608 | ||
609 | static int read_descriptor(struct x86_emulate_ctxt *ctxt, | |
610 | struct x86_emulate_ops *ops, | |
611 | void *ptr, | |
612 | u16 *size, unsigned long *address, int op_bytes) | |
613 | { | |
614 | int rc; | |
615 | ||
616 | if (op_bytes == 2) | |
617 | op_bytes = 3; | |
618 | *address = 0; | |
cebff02b LV |
619 | rc = ops->read_std((unsigned long)ptr, (unsigned long *)size, 2, |
620 | ctxt->vcpu); | |
6aa8b732 AK |
621 | if (rc) |
622 | return rc; | |
cebff02b LV |
623 | rc = ops->read_std((unsigned long)ptr + 2, address, op_bytes, |
624 | ctxt->vcpu); | |
6aa8b732 AK |
625 | return rc; |
626 | } | |
627 | ||
bbe9abbd NK |
628 | static int test_cc(unsigned int condition, unsigned int flags) |
629 | { | |
630 | int rc = 0; | |
631 | ||
632 | switch ((condition & 15) >> 1) { | |
633 | case 0: /* o */ | |
634 | rc |= (flags & EFLG_OF); | |
635 | break; | |
636 | case 1: /* b/c/nae */ | |
637 | rc |= (flags & EFLG_CF); | |
638 | break; | |
639 | case 2: /* z/e */ | |
640 | rc |= (flags & EFLG_ZF); | |
641 | break; | |
642 | case 3: /* be/na */ | |
643 | rc |= (flags & (EFLG_CF|EFLG_ZF)); | |
644 | break; | |
645 | case 4: /* s */ | |
646 | rc |= (flags & EFLG_SF); | |
647 | break; | |
648 | case 5: /* p/pe */ | |
649 | rc |= (flags & EFLG_PF); | |
650 | break; | |
651 | case 7: /* le/ng */ | |
652 | rc |= (flags & EFLG_ZF); | |
653 | /* fall through */ | |
654 | case 6: /* l/nge */ | |
655 | rc |= (!(flags & EFLG_SF) != !(flags & EFLG_OF)); | |
656 | break; | |
657 | } | |
658 | ||
659 | /* Odd condition identifiers (lsb == 1) have inverted sense. */ | |
660 | return (!!rc ^ (condition & 1)); | |
661 | } | |
662 | ||
3c118e24 AK |
663 | static void decode_register_operand(struct operand *op, |
664 | struct decode_cache *c, | |
3c118e24 AK |
665 | int inhibit_bytereg) |
666 | { | |
33615aa9 | 667 | unsigned reg = c->modrm_reg; |
9f1ef3f8 | 668 | int highbyte_regs = c->rex_prefix == 0; |
33615aa9 AK |
669 | |
670 | if (!(c->d & ModRM)) | |
671 | reg = (c->b & 7) | ((c->rex_prefix & 1) << 3); | |
3c118e24 AK |
672 | op->type = OP_REG; |
673 | if ((c->d & ByteOp) && !inhibit_bytereg) { | |
33615aa9 | 674 | op->ptr = decode_register(reg, c->regs, highbyte_regs); |
3c118e24 AK |
675 | op->val = *(u8 *)op->ptr; |
676 | op->bytes = 1; | |
677 | } else { | |
33615aa9 | 678 | op->ptr = decode_register(reg, c->regs, 0); |
3c118e24 AK |
679 | op->bytes = c->op_bytes; |
680 | switch (op->bytes) { | |
681 | case 2: | |
682 | op->val = *(u16 *)op->ptr; | |
683 | break; | |
684 | case 4: | |
685 | op->val = *(u32 *)op->ptr; | |
686 | break; | |
687 | case 8: | |
688 | op->val = *(u64 *) op->ptr; | |
689 | break; | |
690 | } | |
691 | } | |
692 | op->orig_val = op->val; | |
693 | } | |
694 | ||
1c73ef66 AK |
695 | static int decode_modrm(struct x86_emulate_ctxt *ctxt, |
696 | struct x86_emulate_ops *ops) | |
697 | { | |
698 | struct decode_cache *c = &ctxt->decode; | |
699 | u8 sib; | |
f5b4edcd | 700 | int index_reg = 0, base_reg = 0, scale; |
1c73ef66 AK |
701 | int rc = 0; |
702 | ||
703 | if (c->rex_prefix) { | |
704 | c->modrm_reg = (c->rex_prefix & 4) << 1; /* REX.R */ | |
705 | index_reg = (c->rex_prefix & 2) << 2; /* REX.X */ | |
706 | c->modrm_rm = base_reg = (c->rex_prefix & 1) << 3; /* REG.B */ | |
707 | } | |
708 | ||
709 | c->modrm = insn_fetch(u8, 1, c->eip); | |
710 | c->modrm_mod |= (c->modrm & 0xc0) >> 6; | |
711 | c->modrm_reg |= (c->modrm & 0x38) >> 3; | |
712 | c->modrm_rm |= (c->modrm & 0x07); | |
713 | c->modrm_ea = 0; | |
714 | c->use_modrm_ea = 1; | |
715 | ||
716 | if (c->modrm_mod == 3) { | |
107d6d2e AK |
717 | c->modrm_ptr = decode_register(c->modrm_rm, |
718 | c->regs, c->d & ByteOp); | |
719 | c->modrm_val = *(unsigned long *)c->modrm_ptr; | |
1c73ef66 AK |
720 | return rc; |
721 | } | |
722 | ||
723 | if (c->ad_bytes == 2) { | |
724 | unsigned bx = c->regs[VCPU_REGS_RBX]; | |
725 | unsigned bp = c->regs[VCPU_REGS_RBP]; | |
726 | unsigned si = c->regs[VCPU_REGS_RSI]; | |
727 | unsigned di = c->regs[VCPU_REGS_RDI]; | |
728 | ||
729 | /* 16-bit ModR/M decode. */ | |
730 | switch (c->modrm_mod) { | |
731 | case 0: | |
732 | if (c->modrm_rm == 6) | |
733 | c->modrm_ea += insn_fetch(u16, 2, c->eip); | |
734 | break; | |
735 | case 1: | |
736 | c->modrm_ea += insn_fetch(s8, 1, c->eip); | |
737 | break; | |
738 | case 2: | |
739 | c->modrm_ea += insn_fetch(u16, 2, c->eip); | |
740 | break; | |
741 | } | |
742 | switch (c->modrm_rm) { | |
743 | case 0: | |
744 | c->modrm_ea += bx + si; | |
745 | break; | |
746 | case 1: | |
747 | c->modrm_ea += bx + di; | |
748 | break; | |
749 | case 2: | |
750 | c->modrm_ea += bp + si; | |
751 | break; | |
752 | case 3: | |
753 | c->modrm_ea += bp + di; | |
754 | break; | |
755 | case 4: | |
756 | c->modrm_ea += si; | |
757 | break; | |
758 | case 5: | |
759 | c->modrm_ea += di; | |
760 | break; | |
761 | case 6: | |
762 | if (c->modrm_mod != 0) | |
763 | c->modrm_ea += bp; | |
764 | break; | |
765 | case 7: | |
766 | c->modrm_ea += bx; | |
767 | break; | |
768 | } | |
769 | if (c->modrm_rm == 2 || c->modrm_rm == 3 || | |
770 | (c->modrm_rm == 6 && c->modrm_mod != 0)) | |
7a5b56df AK |
771 | if (!c->has_seg_override) |
772 | set_seg_override(c, VCPU_SREG_SS); | |
1c73ef66 AK |
773 | c->modrm_ea = (u16)c->modrm_ea; |
774 | } else { | |
775 | /* 32/64-bit ModR/M decode. */ | |
84411d85 | 776 | if ((c->modrm_rm & 7) == 4) { |
1c73ef66 AK |
777 | sib = insn_fetch(u8, 1, c->eip); |
778 | index_reg |= (sib >> 3) & 7; | |
779 | base_reg |= sib & 7; | |
780 | scale = sib >> 6; | |
781 | ||
dc71d0f1 AK |
782 | if ((base_reg & 7) == 5 && c->modrm_mod == 0) |
783 | c->modrm_ea += insn_fetch(s32, 4, c->eip); | |
784 | else | |
1c73ef66 | 785 | c->modrm_ea += c->regs[base_reg]; |
dc71d0f1 | 786 | if (index_reg != 4) |
1c73ef66 | 787 | c->modrm_ea += c->regs[index_reg] << scale; |
84411d85 AK |
788 | } else if ((c->modrm_rm & 7) == 5 && c->modrm_mod == 0) { |
789 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
f5b4edcd | 790 | c->rip_relative = 1; |
84411d85 | 791 | } else |
1c73ef66 | 792 | c->modrm_ea += c->regs[c->modrm_rm]; |
1c73ef66 AK |
793 | switch (c->modrm_mod) { |
794 | case 0: | |
795 | if (c->modrm_rm == 5) | |
796 | c->modrm_ea += insn_fetch(s32, 4, c->eip); | |
797 | break; | |
798 | case 1: | |
799 | c->modrm_ea += insn_fetch(s8, 1, c->eip); | |
800 | break; | |
801 | case 2: | |
802 | c->modrm_ea += insn_fetch(s32, 4, c->eip); | |
803 | break; | |
804 | } | |
805 | } | |
1c73ef66 AK |
806 | done: |
807 | return rc; | |
808 | } | |
809 | ||
810 | static int decode_abs(struct x86_emulate_ctxt *ctxt, | |
811 | struct x86_emulate_ops *ops) | |
812 | { | |
813 | struct decode_cache *c = &ctxt->decode; | |
814 | int rc = 0; | |
815 | ||
816 | switch (c->ad_bytes) { | |
817 | case 2: | |
818 | c->modrm_ea = insn_fetch(u16, 2, c->eip); | |
819 | break; | |
820 | case 4: | |
821 | c->modrm_ea = insn_fetch(u32, 4, c->eip); | |
822 | break; | |
823 | case 8: | |
824 | c->modrm_ea = insn_fetch(u64, 8, c->eip); | |
825 | break; | |
826 | } | |
827 | done: | |
828 | return rc; | |
829 | } | |
830 | ||
6aa8b732 | 831 | int |
8b4caf66 | 832 | x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) |
6aa8b732 | 833 | { |
e4e03ded | 834 | struct decode_cache *c = &ctxt->decode; |
6aa8b732 | 835 | int rc = 0; |
6aa8b732 | 836 | int mode = ctxt->mode; |
e09d082c | 837 | int def_op_bytes, def_ad_bytes, group; |
6aa8b732 AK |
838 | |
839 | /* Shadow copy of register state. Committed on successful emulation. */ | |
6aa8b732 | 840 | |
e4e03ded | 841 | memset(c, 0, sizeof(struct decode_cache)); |
ad312c7c | 842 | c->eip = ctxt->vcpu->arch.rip; |
7a5b56df | 843 | ctxt->cs_base = seg_base(ctxt, VCPU_SREG_CS); |
ad312c7c | 844 | memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs); |
6aa8b732 AK |
845 | |
846 | switch (mode) { | |
847 | case X86EMUL_MODE_REAL: | |
848 | case X86EMUL_MODE_PROT16: | |
f21b8bf4 | 849 | def_op_bytes = def_ad_bytes = 2; |
6aa8b732 AK |
850 | break; |
851 | case X86EMUL_MODE_PROT32: | |
f21b8bf4 | 852 | def_op_bytes = def_ad_bytes = 4; |
6aa8b732 | 853 | break; |
05b3e0c2 | 854 | #ifdef CONFIG_X86_64 |
6aa8b732 | 855 | case X86EMUL_MODE_PROT64: |
f21b8bf4 AK |
856 | def_op_bytes = 4; |
857 | def_ad_bytes = 8; | |
6aa8b732 AK |
858 | break; |
859 | #endif | |
860 | default: | |
861 | return -1; | |
862 | } | |
863 | ||
f21b8bf4 AK |
864 | c->op_bytes = def_op_bytes; |
865 | c->ad_bytes = def_ad_bytes; | |
866 | ||
6aa8b732 | 867 | /* Legacy prefixes. */ |
b4c6abfe | 868 | for (;;) { |
e4e03ded | 869 | switch (c->b = insn_fetch(u8, 1, c->eip)) { |
6aa8b732 | 870 | case 0x66: /* operand-size override */ |
f21b8bf4 AK |
871 | /* switch between 2/4 bytes */ |
872 | c->op_bytes = def_op_bytes ^ 6; | |
6aa8b732 AK |
873 | break; |
874 | case 0x67: /* address-size override */ | |
875 | if (mode == X86EMUL_MODE_PROT64) | |
e4e03ded | 876 | /* switch between 4/8 bytes */ |
f21b8bf4 | 877 | c->ad_bytes = def_ad_bytes ^ 12; |
6aa8b732 | 878 | else |
e4e03ded | 879 | /* switch between 2/4 bytes */ |
f21b8bf4 | 880 | c->ad_bytes = def_ad_bytes ^ 6; |
6aa8b732 | 881 | break; |
7a5b56df | 882 | case 0x26: /* ES override */ |
6aa8b732 | 883 | case 0x2e: /* CS override */ |
7a5b56df | 884 | case 0x36: /* SS override */ |
6aa8b732 | 885 | case 0x3e: /* DS override */ |
7a5b56df | 886 | set_seg_override(c, (c->b >> 3) & 3); |
6aa8b732 AK |
887 | break; |
888 | case 0x64: /* FS override */ | |
6aa8b732 | 889 | case 0x65: /* GS override */ |
7a5b56df | 890 | set_seg_override(c, c->b & 7); |
6aa8b732 | 891 | break; |
b4c6abfe LV |
892 | case 0x40 ... 0x4f: /* REX */ |
893 | if (mode != X86EMUL_MODE_PROT64) | |
894 | goto done_prefixes; | |
33615aa9 | 895 | c->rex_prefix = c->b; |
b4c6abfe | 896 | continue; |
6aa8b732 | 897 | case 0xf0: /* LOCK */ |
e4e03ded | 898 | c->lock_prefix = 1; |
6aa8b732 | 899 | break; |
ae6200ba | 900 | case 0xf2: /* REPNE/REPNZ */ |
90e0a28f GT |
901 | c->rep_prefix = REPNE_PREFIX; |
902 | break; | |
6aa8b732 | 903 | case 0xf3: /* REP/REPE/REPZ */ |
90e0a28f | 904 | c->rep_prefix = REPE_PREFIX; |
6aa8b732 | 905 | break; |
6aa8b732 AK |
906 | default: |
907 | goto done_prefixes; | |
908 | } | |
b4c6abfe LV |
909 | |
910 | /* Any legacy prefix after a REX prefix nullifies its effect. */ | |
911 | ||
33615aa9 | 912 | c->rex_prefix = 0; |
6aa8b732 AK |
913 | } |
914 | ||
915 | done_prefixes: | |
916 | ||
917 | /* REX prefix. */ | |
1c73ef66 | 918 | if (c->rex_prefix) |
33615aa9 | 919 | if (c->rex_prefix & 8) |
e4e03ded | 920 | c->op_bytes = 8; /* REX.W */ |
6aa8b732 AK |
921 | |
922 | /* Opcode byte(s). */ | |
e4e03ded LV |
923 | c->d = opcode_table[c->b]; |
924 | if (c->d == 0) { | |
6aa8b732 | 925 | /* Two-byte opcode? */ |
e4e03ded LV |
926 | if (c->b == 0x0f) { |
927 | c->twobyte = 1; | |
928 | c->b = insn_fetch(u8, 1, c->eip); | |
929 | c->d = twobyte_table[c->b]; | |
6aa8b732 | 930 | } |
e09d082c | 931 | } |
6aa8b732 | 932 | |
e09d082c AK |
933 | if (c->d & Group) { |
934 | group = c->d & GroupMask; | |
935 | c->modrm = insn_fetch(u8, 1, c->eip); | |
936 | --c->eip; | |
937 | ||
938 | group = (group << 3) + ((c->modrm >> 3) & 7); | |
939 | if ((c->d & GroupDual) && (c->modrm >> 6) == 3) | |
940 | c->d = group2_table[group]; | |
941 | else | |
942 | c->d = group_table[group]; | |
943 | } | |
944 | ||
945 | /* Unrecognised? */ | |
946 | if (c->d == 0) { | |
947 | DPRINTF("Cannot emulate %02x\n", c->b); | |
948 | return -1; | |
6aa8b732 AK |
949 | } |
950 | ||
6e3d5dfb AK |
951 | if (mode == X86EMUL_MODE_PROT64 && (c->d & Stack)) |
952 | c->op_bytes = 8; | |
953 | ||
6aa8b732 | 954 | /* ModRM and SIB bytes. */ |
1c73ef66 AK |
955 | if (c->d & ModRM) |
956 | rc = decode_modrm(ctxt, ops); | |
957 | else if (c->d & MemAbs) | |
958 | rc = decode_abs(ctxt, ops); | |
959 | if (rc) | |
960 | goto done; | |
6aa8b732 | 961 | |
7a5b56df AK |
962 | if (!c->has_seg_override) |
963 | set_seg_override(c, VCPU_SREG_DS); | |
c7e75a3d | 964 | |
7a5b56df AK |
965 | if (!(!c->twobyte && c->b == 0x8d)) |
966 | c->modrm_ea += seg_override_base(ctxt, c); | |
c7e75a3d AK |
967 | |
968 | if (c->ad_bytes != 8) | |
969 | c->modrm_ea = (u32)c->modrm_ea; | |
6aa8b732 AK |
970 | /* |
971 | * Decode and fetch the source operand: register, memory | |
972 | * or immediate. | |
973 | */ | |
e4e03ded | 974 | switch (c->d & SrcMask) { |
6aa8b732 AK |
975 | case SrcNone: |
976 | break; | |
977 | case SrcReg: | |
9f1ef3f8 | 978 | decode_register_operand(&c->src, c, 0); |
6aa8b732 AK |
979 | break; |
980 | case SrcMem16: | |
e4e03ded | 981 | c->src.bytes = 2; |
6aa8b732 AK |
982 | goto srcmem_common; |
983 | case SrcMem32: | |
e4e03ded | 984 | c->src.bytes = 4; |
6aa8b732 AK |
985 | goto srcmem_common; |
986 | case SrcMem: | |
e4e03ded LV |
987 | c->src.bytes = (c->d & ByteOp) ? 1 : |
988 | c->op_bytes; | |
b85b9ee9 | 989 | /* Don't fetch the address for invlpg: it could be unmapped. */ |
d77c26fc | 990 | if (c->twobyte && c->b == 0x01 && c->modrm_reg == 7) |
b85b9ee9 | 991 | break; |
d77c26fc | 992 | srcmem_common: |
4e62417b AJ |
993 | /* |
994 | * For instructions with a ModR/M byte, switch to register | |
995 | * access if Mod = 3. | |
996 | */ | |
e4e03ded LV |
997 | if ((c->d & ModRM) && c->modrm_mod == 3) { |
998 | c->src.type = OP_REG; | |
66b85505 | 999 | c->src.val = c->modrm_val; |
107d6d2e | 1000 | c->src.ptr = c->modrm_ptr; |
4e62417b AJ |
1001 | break; |
1002 | } | |
e4e03ded | 1003 | c->src.type = OP_MEM; |
6aa8b732 AK |
1004 | break; |
1005 | case SrcImm: | |
e4e03ded LV |
1006 | c->src.type = OP_IMM; |
1007 | c->src.ptr = (unsigned long *)c->eip; | |
1008 | c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
1009 | if (c->src.bytes == 8) | |
1010 | c->src.bytes = 4; | |
6aa8b732 | 1011 | /* NB. Immediates are sign-extended as necessary. */ |
e4e03ded | 1012 | switch (c->src.bytes) { |
6aa8b732 | 1013 | case 1: |
e4e03ded | 1014 | c->src.val = insn_fetch(s8, 1, c->eip); |
6aa8b732 AK |
1015 | break; |
1016 | case 2: | |
e4e03ded | 1017 | c->src.val = insn_fetch(s16, 2, c->eip); |
6aa8b732 AK |
1018 | break; |
1019 | case 4: | |
e4e03ded | 1020 | c->src.val = insn_fetch(s32, 4, c->eip); |
6aa8b732 AK |
1021 | break; |
1022 | } | |
1023 | break; | |
1024 | case SrcImmByte: | |
e4e03ded LV |
1025 | c->src.type = OP_IMM; |
1026 | c->src.ptr = (unsigned long *)c->eip; | |
1027 | c->src.bytes = 1; | |
1028 | c->src.val = insn_fetch(s8, 1, c->eip); | |
6aa8b732 AK |
1029 | break; |
1030 | } | |
1031 | ||
038e51de | 1032 | /* Decode and fetch the destination operand: register or memory. */ |
e4e03ded | 1033 | switch (c->d & DstMask) { |
038e51de AK |
1034 | case ImplicitOps: |
1035 | /* Special instructions do their own operand decoding. */ | |
8b4caf66 | 1036 | return 0; |
038e51de | 1037 | case DstReg: |
9f1ef3f8 | 1038 | decode_register_operand(&c->dst, c, |
3c118e24 | 1039 | c->twobyte && (c->b == 0xb6 || c->b == 0xb7)); |
038e51de AK |
1040 | break; |
1041 | case DstMem: | |
e4e03ded | 1042 | if ((c->d & ModRM) && c->modrm_mod == 3) { |
89c69638 | 1043 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; |
e4e03ded | 1044 | c->dst.type = OP_REG; |
66b85505 | 1045 | c->dst.val = c->dst.orig_val = c->modrm_val; |
107d6d2e | 1046 | c->dst.ptr = c->modrm_ptr; |
4e62417b AJ |
1047 | break; |
1048 | } | |
8b4caf66 LV |
1049 | c->dst.type = OP_MEM; |
1050 | break; | |
1051 | } | |
1052 | ||
f5b4edcd AK |
1053 | if (c->rip_relative) |
1054 | c->modrm_ea += c->eip; | |
1055 | ||
8b4caf66 LV |
1056 | done: |
1057 | return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0; | |
1058 | } | |
1059 | ||
8cdbd2c9 LV |
1060 | static inline void emulate_push(struct x86_emulate_ctxt *ctxt) |
1061 | { | |
1062 | struct decode_cache *c = &ctxt->decode; | |
1063 | ||
1064 | c->dst.type = OP_MEM; | |
1065 | c->dst.bytes = c->op_bytes; | |
1066 | c->dst.val = c->src.val; | |
7a957275 | 1067 | register_address_increment(c, &c->regs[VCPU_REGS_RSP], -c->op_bytes); |
7a5b56df | 1068 | c->dst.ptr = (void *) register_address(c, ss_base(ctxt), |
8cdbd2c9 LV |
1069 | c->regs[VCPU_REGS_RSP]); |
1070 | } | |
1071 | ||
1072 | static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt, | |
1073 | struct x86_emulate_ops *ops) | |
1074 | { | |
1075 | struct decode_cache *c = &ctxt->decode; | |
1076 | int rc; | |
1077 | ||
7a5b56df | 1078 | rc = ops->read_std(register_address(c, ss_base(ctxt), |
8cdbd2c9 LV |
1079 | c->regs[VCPU_REGS_RSP]), |
1080 | &c->dst.val, c->dst.bytes, ctxt->vcpu); | |
1081 | if (rc != 0) | |
1082 | return rc; | |
1083 | ||
7a957275 | 1084 | register_address_increment(c, &c->regs[VCPU_REGS_RSP], c->dst.bytes); |
8cdbd2c9 LV |
1085 | |
1086 | return 0; | |
1087 | } | |
1088 | ||
05f086f8 | 1089 | static inline void emulate_grp2(struct x86_emulate_ctxt *ctxt) |
8cdbd2c9 | 1090 | { |
05f086f8 | 1091 | struct decode_cache *c = &ctxt->decode; |
8cdbd2c9 LV |
1092 | switch (c->modrm_reg) { |
1093 | case 0: /* rol */ | |
05f086f8 | 1094 | emulate_2op_SrcB("rol", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1095 | break; |
1096 | case 1: /* ror */ | |
05f086f8 | 1097 | emulate_2op_SrcB("ror", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1098 | break; |
1099 | case 2: /* rcl */ | |
05f086f8 | 1100 | emulate_2op_SrcB("rcl", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1101 | break; |
1102 | case 3: /* rcr */ | |
05f086f8 | 1103 | emulate_2op_SrcB("rcr", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1104 | break; |
1105 | case 4: /* sal/shl */ | |
1106 | case 6: /* sal/shl */ | |
05f086f8 | 1107 | emulate_2op_SrcB("sal", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1108 | break; |
1109 | case 5: /* shr */ | |
05f086f8 | 1110 | emulate_2op_SrcB("shr", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1111 | break; |
1112 | case 7: /* sar */ | |
05f086f8 | 1113 | emulate_2op_SrcB("sar", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1114 | break; |
1115 | } | |
1116 | } | |
1117 | ||
1118 | static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt, | |
05f086f8 | 1119 | struct x86_emulate_ops *ops) |
8cdbd2c9 LV |
1120 | { |
1121 | struct decode_cache *c = &ctxt->decode; | |
1122 | int rc = 0; | |
1123 | ||
1124 | switch (c->modrm_reg) { | |
1125 | case 0 ... 1: /* test */ | |
05f086f8 | 1126 | emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1127 | break; |
1128 | case 2: /* not */ | |
1129 | c->dst.val = ~c->dst.val; | |
1130 | break; | |
1131 | case 3: /* neg */ | |
05f086f8 | 1132 | emulate_1op("neg", c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1133 | break; |
1134 | default: | |
1135 | DPRINTF("Cannot emulate %02x\n", c->b); | |
1136 | rc = X86EMUL_UNHANDLEABLE; | |
1137 | break; | |
1138 | } | |
8cdbd2c9 LV |
1139 | return rc; |
1140 | } | |
1141 | ||
1142 | static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt, | |
a01af5ec | 1143 | struct x86_emulate_ops *ops) |
8cdbd2c9 LV |
1144 | { |
1145 | struct decode_cache *c = &ctxt->decode; | |
8cdbd2c9 LV |
1146 | |
1147 | switch (c->modrm_reg) { | |
1148 | case 0: /* inc */ | |
05f086f8 | 1149 | emulate_1op("inc", c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1150 | break; |
1151 | case 1: /* dec */ | |
05f086f8 | 1152 | emulate_1op("dec", c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1153 | break; |
1154 | case 4: /* jmp abs */ | |
fd60754e | 1155 | c->eip = c->src.val; |
8cdbd2c9 LV |
1156 | break; |
1157 | case 6: /* push */ | |
fd60754e | 1158 | emulate_push(ctxt); |
8cdbd2c9 | 1159 | break; |
8cdbd2c9 LV |
1160 | } |
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | static inline int emulate_grp9(struct x86_emulate_ctxt *ctxt, | |
1165 | struct x86_emulate_ops *ops, | |
e8d8d7fe | 1166 | unsigned long memop) |
8cdbd2c9 LV |
1167 | { |
1168 | struct decode_cache *c = &ctxt->decode; | |
1169 | u64 old, new; | |
1170 | int rc; | |
1171 | ||
e8d8d7fe | 1172 | rc = ops->read_emulated(memop, &old, 8, ctxt->vcpu); |
8cdbd2c9 LV |
1173 | if (rc != 0) |
1174 | return rc; | |
1175 | ||
1176 | if (((u32) (old >> 0) != (u32) c->regs[VCPU_REGS_RAX]) || | |
1177 | ((u32) (old >> 32) != (u32) c->regs[VCPU_REGS_RDX])) { | |
1178 | ||
1179 | c->regs[VCPU_REGS_RAX] = (u32) (old >> 0); | |
1180 | c->regs[VCPU_REGS_RDX] = (u32) (old >> 32); | |
05f086f8 | 1181 | ctxt->eflags &= ~EFLG_ZF; |
8cdbd2c9 LV |
1182 | |
1183 | } else { | |
1184 | new = ((u64)c->regs[VCPU_REGS_RCX] << 32) | | |
1185 | (u32) c->regs[VCPU_REGS_RBX]; | |
1186 | ||
e8d8d7fe | 1187 | rc = ops->cmpxchg_emulated(memop, &old, &new, 8, ctxt->vcpu); |
8cdbd2c9 LV |
1188 | if (rc != 0) |
1189 | return rc; | |
05f086f8 | 1190 | ctxt->eflags |= EFLG_ZF; |
8cdbd2c9 LV |
1191 | } |
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | static inline int writeback(struct x86_emulate_ctxt *ctxt, | |
1196 | struct x86_emulate_ops *ops) | |
1197 | { | |
1198 | int rc; | |
1199 | struct decode_cache *c = &ctxt->decode; | |
1200 | ||
1201 | switch (c->dst.type) { | |
1202 | case OP_REG: | |
1203 | /* The 4-byte case *is* correct: | |
1204 | * in 64-bit mode we zero-extend. | |
1205 | */ | |
1206 | switch (c->dst.bytes) { | |
1207 | case 1: | |
1208 | *(u8 *)c->dst.ptr = (u8)c->dst.val; | |
1209 | break; | |
1210 | case 2: | |
1211 | *(u16 *)c->dst.ptr = (u16)c->dst.val; | |
1212 | break; | |
1213 | case 4: | |
1214 | *c->dst.ptr = (u32)c->dst.val; | |
1215 | break; /* 64b: zero-ext */ | |
1216 | case 8: | |
1217 | *c->dst.ptr = c->dst.val; | |
1218 | break; | |
1219 | } | |
1220 | break; | |
1221 | case OP_MEM: | |
1222 | if (c->lock_prefix) | |
1223 | rc = ops->cmpxchg_emulated( | |
1224 | (unsigned long)c->dst.ptr, | |
1225 | &c->dst.orig_val, | |
1226 | &c->dst.val, | |
1227 | c->dst.bytes, | |
1228 | ctxt->vcpu); | |
1229 | else | |
1230 | rc = ops->write_emulated( | |
1231 | (unsigned long)c->dst.ptr, | |
1232 | &c->dst.val, | |
1233 | c->dst.bytes, | |
1234 | ctxt->vcpu); | |
1235 | if (rc != 0) | |
1236 | return rc; | |
a01af5ec LV |
1237 | break; |
1238 | case OP_NONE: | |
1239 | /* no writeback */ | |
1240 | break; | |
8cdbd2c9 LV |
1241 | default: |
1242 | break; | |
1243 | } | |
1244 | return 0; | |
1245 | } | |
1246 | ||
8b4caf66 | 1247 | int |
1be3aa47 | 1248 | x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) |
8b4caf66 | 1249 | { |
e8d8d7fe | 1250 | unsigned long memop = 0; |
8b4caf66 | 1251 | u64 msr_data; |
3427318f | 1252 | unsigned long saved_eip = 0; |
8b4caf66 | 1253 | struct decode_cache *c = &ctxt->decode; |
1be3aa47 | 1254 | int rc = 0; |
8b4caf66 | 1255 | |
3427318f LV |
1256 | /* Shadow copy of register state. Committed on successful emulation. |
1257 | * NOTE: we can copy them from vcpu as x86_decode_insn() doesn't | |
1258 | * modify them. | |
1259 | */ | |
1260 | ||
ad312c7c | 1261 | memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs); |
3427318f LV |
1262 | saved_eip = c->eip; |
1263 | ||
c7e75a3d | 1264 | if (((c->d & ModRM) && (c->modrm_mod != 3)) || (c->d & MemAbs)) |
e8d8d7fe | 1265 | memop = c->modrm_ea; |
8b4caf66 | 1266 | |
b9fa9d6b AK |
1267 | if (c->rep_prefix && (c->d & String)) { |
1268 | /* All REP prefixes have the same first termination condition */ | |
1269 | if (c->regs[VCPU_REGS_RCX] == 0) { | |
ad312c7c | 1270 | ctxt->vcpu->arch.rip = c->eip; |
b9fa9d6b AK |
1271 | goto done; |
1272 | } | |
1273 | /* The second termination condition only applies for REPE | |
1274 | * and REPNE. Test if the repeat string operation prefix is | |
1275 | * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the | |
1276 | * corresponding termination condition according to: | |
1277 | * - if REPE/REPZ and ZF = 0 then done | |
1278 | * - if REPNE/REPNZ and ZF = 1 then done | |
1279 | */ | |
1280 | if ((c->b == 0xa6) || (c->b == 0xa7) || | |
1281 | (c->b == 0xae) || (c->b == 0xaf)) { | |
1282 | if ((c->rep_prefix == REPE_PREFIX) && | |
1283 | ((ctxt->eflags & EFLG_ZF) == 0)) { | |
ad312c7c | 1284 | ctxt->vcpu->arch.rip = c->eip; |
b9fa9d6b AK |
1285 | goto done; |
1286 | } | |
1287 | if ((c->rep_prefix == REPNE_PREFIX) && | |
1288 | ((ctxt->eflags & EFLG_ZF) == EFLG_ZF)) { | |
ad312c7c | 1289 | ctxt->vcpu->arch.rip = c->eip; |
b9fa9d6b AK |
1290 | goto done; |
1291 | } | |
1292 | } | |
1293 | c->regs[VCPU_REGS_RCX]--; | |
ad312c7c | 1294 | c->eip = ctxt->vcpu->arch.rip; |
b9fa9d6b AK |
1295 | } |
1296 | ||
8b4caf66 | 1297 | if (c->src.type == OP_MEM) { |
e8d8d7fe | 1298 | c->src.ptr = (unsigned long *)memop; |
8b4caf66 | 1299 | c->src.val = 0; |
d77c26fc MD |
1300 | rc = ops->read_emulated((unsigned long)c->src.ptr, |
1301 | &c->src.val, | |
1302 | c->src.bytes, | |
1303 | ctxt->vcpu); | |
1304 | if (rc != 0) | |
8b4caf66 LV |
1305 | goto done; |
1306 | c->src.orig_val = c->src.val; | |
1307 | } | |
1308 | ||
1309 | if ((c->d & DstMask) == ImplicitOps) | |
1310 | goto special_insn; | |
1311 | ||
1312 | ||
1313 | if (c->dst.type == OP_MEM) { | |
e8d8d7fe | 1314 | c->dst.ptr = (unsigned long *)memop; |
8b4caf66 LV |
1315 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; |
1316 | c->dst.val = 0; | |
e4e03ded LV |
1317 | if (c->d & BitOp) { |
1318 | unsigned long mask = ~(c->dst.bytes * 8 - 1); | |
df513e2c | 1319 | |
e4e03ded LV |
1320 | c->dst.ptr = (void *)c->dst.ptr + |
1321 | (c->src.val & mask) / 8; | |
038e51de | 1322 | } |
e4e03ded LV |
1323 | if (!(c->d & Mov) && |
1324 | /* optimisation - avoid slow emulated read */ | |
1325 | ((rc = ops->read_emulated((unsigned long)c->dst.ptr, | |
1326 | &c->dst.val, | |
1327 | c->dst.bytes, ctxt->vcpu)) != 0)) | |
038e51de | 1328 | goto done; |
038e51de | 1329 | } |
e4e03ded | 1330 | c->dst.orig_val = c->dst.val; |
038e51de | 1331 | |
018a98db AK |
1332 | special_insn: |
1333 | ||
e4e03ded | 1334 | if (c->twobyte) |
6aa8b732 AK |
1335 | goto twobyte_insn; |
1336 | ||
e4e03ded | 1337 | switch (c->b) { |
6aa8b732 AK |
1338 | case 0x00 ... 0x05: |
1339 | add: /* add */ | |
05f086f8 | 1340 | emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags); |
6aa8b732 AK |
1341 | break; |
1342 | case 0x08 ... 0x0d: | |
1343 | or: /* or */ | |
05f086f8 | 1344 | emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags); |
6aa8b732 AK |
1345 | break; |
1346 | case 0x10 ... 0x15: | |
1347 | adc: /* adc */ | |
05f086f8 | 1348 | emulate_2op_SrcV("adc", c->src, c->dst, ctxt->eflags); |
6aa8b732 AK |
1349 | break; |
1350 | case 0x18 ... 0x1d: | |
1351 | sbb: /* sbb */ | |
05f086f8 | 1352 | emulate_2op_SrcV("sbb", c->src, c->dst, ctxt->eflags); |
6aa8b732 | 1353 | break; |
19eb938e | 1354 | case 0x20 ... 0x23: |
6aa8b732 | 1355 | and: /* and */ |
05f086f8 | 1356 | emulate_2op_SrcV("and", c->src, c->dst, ctxt->eflags); |
6aa8b732 | 1357 | break; |
19eb938e | 1358 | case 0x24: /* and al imm8 */ |
e4e03ded LV |
1359 | c->dst.type = OP_REG; |
1360 | c->dst.ptr = &c->regs[VCPU_REGS_RAX]; | |
1361 | c->dst.val = *(u8 *)c->dst.ptr; | |
1362 | c->dst.bytes = 1; | |
1363 | c->dst.orig_val = c->dst.val; | |
19eb938e NK |
1364 | goto and; |
1365 | case 0x25: /* and ax imm16, or eax imm32 */ | |
e4e03ded LV |
1366 | c->dst.type = OP_REG; |
1367 | c->dst.bytes = c->op_bytes; | |
1368 | c->dst.ptr = &c->regs[VCPU_REGS_RAX]; | |
1369 | if (c->op_bytes == 2) | |
1370 | c->dst.val = *(u16 *)c->dst.ptr; | |
19eb938e | 1371 | else |
e4e03ded LV |
1372 | c->dst.val = *(u32 *)c->dst.ptr; |
1373 | c->dst.orig_val = c->dst.val; | |
19eb938e | 1374 | goto and; |
6aa8b732 AK |
1375 | case 0x28 ... 0x2d: |
1376 | sub: /* sub */ | |
05f086f8 | 1377 | emulate_2op_SrcV("sub", c->src, c->dst, ctxt->eflags); |
6aa8b732 AK |
1378 | break; |
1379 | case 0x30 ... 0x35: | |
1380 | xor: /* xor */ | |
05f086f8 | 1381 | emulate_2op_SrcV("xor", c->src, c->dst, ctxt->eflags); |
6aa8b732 AK |
1382 | break; |
1383 | case 0x38 ... 0x3d: | |
1384 | cmp: /* cmp */ | |
05f086f8 | 1385 | emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags); |
6aa8b732 | 1386 | break; |
33615aa9 AK |
1387 | case 0x40 ... 0x47: /* inc r16/r32 */ |
1388 | emulate_1op("inc", c->dst, ctxt->eflags); | |
1389 | break; | |
1390 | case 0x48 ... 0x4f: /* dec r16/r32 */ | |
1391 | emulate_1op("dec", c->dst, ctxt->eflags); | |
1392 | break; | |
1393 | case 0x50 ... 0x57: /* push reg */ | |
1394 | c->dst.type = OP_MEM; | |
1395 | c->dst.bytes = c->op_bytes; | |
1396 | c->dst.val = c->src.val; | |
7a957275 | 1397 | register_address_increment(c, &c->regs[VCPU_REGS_RSP], |
33615aa9 AK |
1398 | -c->op_bytes); |
1399 | c->dst.ptr = (void *) register_address( | |
7a5b56df | 1400 | c, ss_base(ctxt), c->regs[VCPU_REGS_RSP]); |
33615aa9 AK |
1401 | break; |
1402 | case 0x58 ... 0x5f: /* pop reg */ | |
1403 | pop_instruction: | |
7a5b56df | 1404 | if ((rc = ops->read_std(register_address(c, ss_base(ctxt), |
33615aa9 AK |
1405 | c->regs[VCPU_REGS_RSP]), c->dst.ptr, |
1406 | c->op_bytes, ctxt->vcpu)) != 0) | |
1407 | goto done; | |
1408 | ||
7a957275 | 1409 | register_address_increment(c, &c->regs[VCPU_REGS_RSP], |
33615aa9 AK |
1410 | c->op_bytes); |
1411 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
1412 | break; | |
6aa8b732 | 1413 | case 0x63: /* movsxd */ |
8b4caf66 | 1414 | if (ctxt->mode != X86EMUL_MODE_PROT64) |
6aa8b732 | 1415 | goto cannot_emulate; |
e4e03ded | 1416 | c->dst.val = (s32) c->src.val; |
6aa8b732 | 1417 | break; |
91ed7a0e | 1418 | case 0x68: /* push imm */ |
018a98db | 1419 | case 0x6a: /* push imm8 */ |
018a98db AK |
1420 | emulate_push(ctxt); |
1421 | break; | |
1422 | case 0x6c: /* insb */ | |
1423 | case 0x6d: /* insw/insd */ | |
1424 | if (kvm_emulate_pio_string(ctxt->vcpu, NULL, | |
1425 | 1, | |
1426 | (c->d & ByteOp) ? 1 : c->op_bytes, | |
1427 | c->rep_prefix ? | |
e4706772 | 1428 | address_mask(c, c->regs[VCPU_REGS_RCX]) : 1, |
018a98db | 1429 | (ctxt->eflags & EFLG_DF), |
7a5b56df | 1430 | register_address(c, es_base(ctxt), |
018a98db AK |
1431 | c->regs[VCPU_REGS_RDI]), |
1432 | c->rep_prefix, | |
1433 | c->regs[VCPU_REGS_RDX]) == 0) { | |
1434 | c->eip = saved_eip; | |
1435 | return -1; | |
1436 | } | |
1437 | return 0; | |
1438 | case 0x6e: /* outsb */ | |
1439 | case 0x6f: /* outsw/outsd */ | |
1440 | if (kvm_emulate_pio_string(ctxt->vcpu, NULL, | |
1441 | 0, | |
1442 | (c->d & ByteOp) ? 1 : c->op_bytes, | |
1443 | c->rep_prefix ? | |
e4706772 | 1444 | address_mask(c, c->regs[VCPU_REGS_RCX]) : 1, |
018a98db | 1445 | (ctxt->eflags & EFLG_DF), |
7a5b56df AK |
1446 | register_address(c, |
1447 | seg_override_base(ctxt, c), | |
018a98db AK |
1448 | c->regs[VCPU_REGS_RSI]), |
1449 | c->rep_prefix, | |
1450 | c->regs[VCPU_REGS_RDX]) == 0) { | |
1451 | c->eip = saved_eip; | |
1452 | return -1; | |
1453 | } | |
1454 | return 0; | |
1455 | case 0x70 ... 0x7f: /* jcc (short) */ { | |
1456 | int rel = insn_fetch(s8, 1, c->eip); | |
1457 | ||
1458 | if (test_cc(c->b, ctxt->eflags)) | |
7a957275 | 1459 | jmp_rel(c, rel); |
018a98db AK |
1460 | break; |
1461 | } | |
6aa8b732 | 1462 | case 0x80 ... 0x83: /* Grp1 */ |
e4e03ded | 1463 | switch (c->modrm_reg) { |
6aa8b732 AK |
1464 | case 0: |
1465 | goto add; | |
1466 | case 1: | |
1467 | goto or; | |
1468 | case 2: | |
1469 | goto adc; | |
1470 | case 3: | |
1471 | goto sbb; | |
1472 | case 4: | |
1473 | goto and; | |
1474 | case 5: | |
1475 | goto sub; | |
1476 | case 6: | |
1477 | goto xor; | |
1478 | case 7: | |
1479 | goto cmp; | |
1480 | } | |
1481 | break; | |
1482 | case 0x84 ... 0x85: | |
05f086f8 | 1483 | emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags); |
6aa8b732 AK |
1484 | break; |
1485 | case 0x86 ... 0x87: /* xchg */ | |
b13354f8 | 1486 | xchg: |
6aa8b732 | 1487 | /* Write back the register source. */ |
e4e03ded | 1488 | switch (c->dst.bytes) { |
6aa8b732 | 1489 | case 1: |
e4e03ded | 1490 | *(u8 *) c->src.ptr = (u8) c->dst.val; |
6aa8b732 AK |
1491 | break; |
1492 | case 2: | |
e4e03ded | 1493 | *(u16 *) c->src.ptr = (u16) c->dst.val; |
6aa8b732 AK |
1494 | break; |
1495 | case 4: | |
e4e03ded | 1496 | *c->src.ptr = (u32) c->dst.val; |
6aa8b732 AK |
1497 | break; /* 64b reg: zero-extend */ |
1498 | case 8: | |
e4e03ded | 1499 | *c->src.ptr = c->dst.val; |
6aa8b732 AK |
1500 | break; |
1501 | } | |
1502 | /* | |
1503 | * Write back the memory destination with implicit LOCK | |
1504 | * prefix. | |
1505 | */ | |
e4e03ded LV |
1506 | c->dst.val = c->src.val; |
1507 | c->lock_prefix = 1; | |
6aa8b732 | 1508 | break; |
6aa8b732 | 1509 | case 0x88 ... 0x8b: /* mov */ |
7de75248 | 1510 | goto mov; |
38d5bc6d GT |
1511 | case 0x8c: { /* mov r/m, sreg */ |
1512 | struct kvm_segment segreg; | |
1513 | ||
1514 | if (c->modrm_reg <= 5) | |
1515 | kvm_get_segment(ctxt->vcpu, &segreg, c->modrm_reg); | |
1516 | else { | |
1517 | printk(KERN_INFO "0x8c: Invalid segreg in modrm byte 0x%02x\n", | |
1518 | c->modrm); | |
1519 | goto cannot_emulate; | |
1520 | } | |
1521 | c->dst.val = segreg.selector; | |
1522 | break; | |
1523 | } | |
7e0b54b1 | 1524 | case 0x8d: /* lea r16/r32, m */ |
f9b7aab3 | 1525 | c->dst.val = c->modrm_ea; |
7e0b54b1 | 1526 | break; |
4257198a GT |
1527 | case 0x8e: { /* mov seg, r/m16 */ |
1528 | uint16_t sel; | |
1529 | int type_bits; | |
1530 | int err; | |
1531 | ||
1532 | sel = c->src.val; | |
1533 | if (c->modrm_reg <= 5) { | |
1534 | type_bits = (c->modrm_reg == 1) ? 9 : 1; | |
1535 | err = kvm_load_segment_descriptor(ctxt->vcpu, sel, | |
1536 | type_bits, c->modrm_reg); | |
1537 | } else { | |
1538 | printk(KERN_INFO "Invalid segreg in modrm byte 0x%02x\n", | |
1539 | c->modrm); | |
1540 | goto cannot_emulate; | |
1541 | } | |
1542 | ||
1543 | if (err < 0) | |
1544 | goto cannot_emulate; | |
1545 | ||
1546 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
1547 | break; | |
1548 | } | |
6aa8b732 | 1549 | case 0x8f: /* pop (sole member of Grp1a) */ |
8cdbd2c9 LV |
1550 | rc = emulate_grp1a(ctxt, ops); |
1551 | if (rc != 0) | |
6aa8b732 | 1552 | goto done; |
6aa8b732 | 1553 | break; |
b13354f8 MG |
1554 | case 0x90: /* nop / xchg r8,rax */ |
1555 | if (!(c->rex_prefix & 1)) { /* nop */ | |
1556 | c->dst.type = OP_NONE; | |
1557 | break; | |
1558 | } | |
1559 | case 0x91 ... 0x97: /* xchg reg,rax */ | |
1560 | c->src.type = c->dst.type = OP_REG; | |
1561 | c->src.bytes = c->dst.bytes = c->op_bytes; | |
1562 | c->src.ptr = (unsigned long *) &c->regs[VCPU_REGS_RAX]; | |
1563 | c->src.val = *(c->src.ptr); | |
1564 | goto xchg; | |
fd2a7608 | 1565 | case 0x9c: /* pushf */ |
05f086f8 | 1566 | c->src.val = (unsigned long) ctxt->eflags; |
8cdbd2c9 LV |
1567 | emulate_push(ctxt); |
1568 | break; | |
535eabcf | 1569 | case 0x9d: /* popf */ |
05f086f8 | 1570 | c->dst.ptr = (unsigned long *) &ctxt->eflags; |
535eabcf | 1571 | goto pop_instruction; |
018a98db AK |
1572 | case 0xa0 ... 0xa1: /* mov */ |
1573 | c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX]; | |
1574 | c->dst.val = c->src.val; | |
1575 | break; | |
1576 | case 0xa2 ... 0xa3: /* mov */ | |
1577 | c->dst.val = (unsigned long)c->regs[VCPU_REGS_RAX]; | |
1578 | break; | |
6aa8b732 | 1579 | case 0xa4 ... 0xa5: /* movs */ |
e4e03ded LV |
1580 | c->dst.type = OP_MEM; |
1581 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
e4706772 | 1582 | c->dst.ptr = (unsigned long *)register_address(c, |
7a5b56df | 1583 | es_base(ctxt), |
e4e03ded | 1584 | c->regs[VCPU_REGS_RDI]); |
e4706772 | 1585 | if ((rc = ops->read_emulated(register_address(c, |
7a5b56df | 1586 | seg_override_base(ctxt, c), |
e4e03ded LV |
1587 | c->regs[VCPU_REGS_RSI]), |
1588 | &c->dst.val, | |
1589 | c->dst.bytes, ctxt->vcpu)) != 0) | |
6aa8b732 | 1590 | goto done; |
7a957275 | 1591 | register_address_increment(c, &c->regs[VCPU_REGS_RSI], |
05f086f8 | 1592 | (ctxt->eflags & EFLG_DF) ? -c->dst.bytes |
e4e03ded | 1593 | : c->dst.bytes); |
7a957275 | 1594 | register_address_increment(c, &c->regs[VCPU_REGS_RDI], |
05f086f8 | 1595 | (ctxt->eflags & EFLG_DF) ? -c->dst.bytes |
e4e03ded | 1596 | : c->dst.bytes); |
6aa8b732 AK |
1597 | break; |
1598 | case 0xa6 ... 0xa7: /* cmps */ | |
d7e5117a GT |
1599 | c->src.type = OP_NONE; /* Disable writeback. */ |
1600 | c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
e4706772 | 1601 | c->src.ptr = (unsigned long *)register_address(c, |
7a5b56df | 1602 | seg_override_base(ctxt, c), |
d7e5117a GT |
1603 | c->regs[VCPU_REGS_RSI]); |
1604 | if ((rc = ops->read_emulated((unsigned long)c->src.ptr, | |
1605 | &c->src.val, | |
1606 | c->src.bytes, | |
1607 | ctxt->vcpu)) != 0) | |
1608 | goto done; | |
1609 | ||
1610 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
1611 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
e4706772 | 1612 | c->dst.ptr = (unsigned long *)register_address(c, |
7a5b56df | 1613 | es_base(ctxt), |
d7e5117a GT |
1614 | c->regs[VCPU_REGS_RDI]); |
1615 | if ((rc = ops->read_emulated((unsigned long)c->dst.ptr, | |
1616 | &c->dst.val, | |
1617 | c->dst.bytes, | |
1618 | ctxt->vcpu)) != 0) | |
1619 | goto done; | |
1620 | ||
1621 | DPRINTF("cmps: mem1=0x%p mem2=0x%p\n", c->src.ptr, c->dst.ptr); | |
1622 | ||
1623 | emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags); | |
1624 | ||
7a957275 | 1625 | register_address_increment(c, &c->regs[VCPU_REGS_RSI], |
d7e5117a GT |
1626 | (ctxt->eflags & EFLG_DF) ? -c->src.bytes |
1627 | : c->src.bytes); | |
7a957275 | 1628 | register_address_increment(c, &c->regs[VCPU_REGS_RDI], |
d7e5117a GT |
1629 | (ctxt->eflags & EFLG_DF) ? -c->dst.bytes |
1630 | : c->dst.bytes); | |
1631 | ||
1632 | break; | |
6aa8b732 | 1633 | case 0xaa ... 0xab: /* stos */ |
e4e03ded LV |
1634 | c->dst.type = OP_MEM; |
1635 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
e4706772 | 1636 | c->dst.ptr = (unsigned long *)register_address(c, |
7a5b56df | 1637 | es_base(ctxt), |
a7e6c88a | 1638 | c->regs[VCPU_REGS_RDI]); |
e4e03ded | 1639 | c->dst.val = c->regs[VCPU_REGS_RAX]; |
7a957275 | 1640 | register_address_increment(c, &c->regs[VCPU_REGS_RDI], |
05f086f8 | 1641 | (ctxt->eflags & EFLG_DF) ? -c->dst.bytes |
e4e03ded | 1642 | : c->dst.bytes); |
6aa8b732 AK |
1643 | break; |
1644 | case 0xac ... 0xad: /* lods */ | |
e4e03ded LV |
1645 | c->dst.type = OP_REG; |
1646 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
1647 | c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX]; | |
e4706772 | 1648 | if ((rc = ops->read_emulated(register_address(c, |
7a5b56df | 1649 | seg_override_base(ctxt, c), |
a7e6c88a SY |
1650 | c->regs[VCPU_REGS_RSI]), |
1651 | &c->dst.val, | |
1652 | c->dst.bytes, | |
1653 | ctxt->vcpu)) != 0) | |
6aa8b732 | 1654 | goto done; |
7a957275 | 1655 | register_address_increment(c, &c->regs[VCPU_REGS_RSI], |
05f086f8 | 1656 | (ctxt->eflags & EFLG_DF) ? -c->dst.bytes |
e4e03ded | 1657 | : c->dst.bytes); |
6aa8b732 AK |
1658 | break; |
1659 | case 0xae ... 0xaf: /* scas */ | |
1660 | DPRINTF("Urk! I don't handle SCAS.\n"); | |
1661 | goto cannot_emulate; | |
615ac125 GT |
1662 | case 0xb8: /* mov r, imm */ |
1663 | goto mov; | |
018a98db AK |
1664 | case 0xc0 ... 0xc1: |
1665 | emulate_grp2(ctxt); | |
1666 | break; | |
111de5d6 AK |
1667 | case 0xc3: /* ret */ |
1668 | c->dst.ptr = &c->eip; | |
1669 | goto pop_instruction; | |
018a98db AK |
1670 | case 0xc6 ... 0xc7: /* mov (sole member of Grp11) */ |
1671 | mov: | |
1672 | c->dst.val = c->src.val; | |
1673 | break; | |
1674 | case 0xd0 ... 0xd1: /* Grp2 */ | |
1675 | c->src.val = 1; | |
1676 | emulate_grp2(ctxt); | |
1677 | break; | |
1678 | case 0xd2 ... 0xd3: /* Grp2 */ | |
1679 | c->src.val = c->regs[VCPU_REGS_RCX]; | |
1680 | emulate_grp2(ctxt); | |
1681 | break; | |
1a52e051 NK |
1682 | case 0xe8: /* call (near) */ { |
1683 | long int rel; | |
e4e03ded | 1684 | switch (c->op_bytes) { |
1a52e051 | 1685 | case 2: |
e4e03ded | 1686 | rel = insn_fetch(s16, 2, c->eip); |
1a52e051 NK |
1687 | break; |
1688 | case 4: | |
e4e03ded | 1689 | rel = insn_fetch(s32, 4, c->eip); |
1a52e051 | 1690 | break; |
1a52e051 NK |
1691 | default: |
1692 | DPRINTF("Call: Invalid op_bytes\n"); | |
1693 | goto cannot_emulate; | |
1694 | } | |
e4e03ded | 1695 | c->src.val = (unsigned long) c->eip; |
7a957275 | 1696 | jmp_rel(c, rel); |
e4e03ded | 1697 | c->op_bytes = c->ad_bytes; |
8cdbd2c9 LV |
1698 | emulate_push(ctxt); |
1699 | break; | |
1a52e051 NK |
1700 | } |
1701 | case 0xe9: /* jmp rel */ | |
954cd36f GT |
1702 | goto jmp; |
1703 | case 0xea: /* jmp far */ { | |
1704 | uint32_t eip; | |
1705 | uint16_t sel; | |
1706 | ||
1707 | switch (c->op_bytes) { | |
1708 | case 2: | |
1709 | eip = insn_fetch(u16, 2, c->eip); | |
1710 | break; | |
1711 | case 4: | |
1712 | eip = insn_fetch(u32, 4, c->eip); | |
1713 | break; | |
1714 | default: | |
1715 | DPRINTF("jmp far: Invalid op_bytes\n"); | |
1716 | goto cannot_emulate; | |
1717 | } | |
1718 | sel = insn_fetch(u16, 2, c->eip); | |
1719 | if (kvm_load_segment_descriptor(ctxt->vcpu, sel, 9, VCPU_SREG_CS) < 0) { | |
1720 | DPRINTF("jmp far: Failed to load CS descriptor\n"); | |
1721 | goto cannot_emulate; | |
1722 | } | |
1723 | ||
1724 | c->eip = eip; | |
1725 | break; | |
1726 | } | |
1727 | case 0xeb: | |
1728 | jmp: /* jmp rel short */ | |
7a957275 | 1729 | jmp_rel(c, c->src.val); |
a01af5ec | 1730 | c->dst.type = OP_NONE; /* Disable writeback. */ |
1a52e051 | 1731 | break; |
111de5d6 | 1732 | case 0xf4: /* hlt */ |
ad312c7c | 1733 | ctxt->vcpu->arch.halt_request = 1; |
111de5d6 AK |
1734 | goto done; |
1735 | case 0xf5: /* cmc */ | |
1736 | /* complement carry flag from eflags reg */ | |
1737 | ctxt->eflags ^= EFLG_CF; | |
1738 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
1739 | break; | |
018a98db AK |
1740 | case 0xf6 ... 0xf7: /* Grp3 */ |
1741 | rc = emulate_grp3(ctxt, ops); | |
1742 | if (rc != 0) | |
1743 | goto done; | |
1744 | break; | |
111de5d6 AK |
1745 | case 0xf8: /* clc */ |
1746 | ctxt->eflags &= ~EFLG_CF; | |
1747 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
1748 | break; | |
1749 | case 0xfa: /* cli */ | |
1750 | ctxt->eflags &= ~X86_EFLAGS_IF; | |
1751 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
1752 | break; | |
1753 | case 0xfb: /* sti */ | |
1754 | ctxt->eflags |= X86_EFLAGS_IF; | |
1755 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
1756 | break; | |
018a98db AK |
1757 | case 0xfe ... 0xff: /* Grp4/Grp5 */ |
1758 | rc = emulate_grp45(ctxt, ops); | |
1759 | if (rc != 0) | |
1760 | goto done; | |
1761 | break; | |
6aa8b732 | 1762 | } |
018a98db AK |
1763 | |
1764 | writeback: | |
1765 | rc = writeback(ctxt, ops); | |
1766 | if (rc != 0) | |
1767 | goto done; | |
1768 | ||
1769 | /* Commit shadow register state. */ | |
ad312c7c ZX |
1770 | memcpy(ctxt->vcpu->arch.regs, c->regs, sizeof c->regs); |
1771 | ctxt->vcpu->arch.rip = c->eip; | |
018a98db AK |
1772 | |
1773 | done: | |
1774 | if (rc == X86EMUL_UNHANDLEABLE) { | |
1775 | c->eip = saved_eip; | |
1776 | return -1; | |
1777 | } | |
1778 | return 0; | |
6aa8b732 AK |
1779 | |
1780 | twobyte_insn: | |
e4e03ded | 1781 | switch (c->b) { |
6aa8b732 | 1782 | case 0x01: /* lgdt, lidt, lmsw */ |
e4e03ded | 1783 | switch (c->modrm_reg) { |
6aa8b732 AK |
1784 | u16 size; |
1785 | unsigned long address; | |
1786 | ||
aca7f966 | 1787 | case 0: /* vmcall */ |
e4e03ded | 1788 | if (c->modrm_mod != 3 || c->modrm_rm != 1) |
aca7f966 AL |
1789 | goto cannot_emulate; |
1790 | ||
7aa81cc0 AL |
1791 | rc = kvm_fix_hypercall(ctxt->vcpu); |
1792 | if (rc) | |
1793 | goto done; | |
1794 | ||
33e3885d AK |
1795 | /* Let the processor re-execute the fixed hypercall */ |
1796 | c->eip = ctxt->vcpu->arch.rip; | |
16286d08 AK |
1797 | /* Disable writeback. */ |
1798 | c->dst.type = OP_NONE; | |
aca7f966 | 1799 | break; |
6aa8b732 | 1800 | case 2: /* lgdt */ |
e4e03ded LV |
1801 | rc = read_descriptor(ctxt, ops, c->src.ptr, |
1802 | &size, &address, c->op_bytes); | |
6aa8b732 AK |
1803 | if (rc) |
1804 | goto done; | |
1805 | realmode_lgdt(ctxt->vcpu, size, address); | |
16286d08 AK |
1806 | /* Disable writeback. */ |
1807 | c->dst.type = OP_NONE; | |
6aa8b732 | 1808 | break; |
aca7f966 | 1809 | case 3: /* lidt/vmmcall */ |
e4e03ded | 1810 | if (c->modrm_mod == 3 && c->modrm_rm == 1) { |
7aa81cc0 AL |
1811 | rc = kvm_fix_hypercall(ctxt->vcpu); |
1812 | if (rc) | |
1813 | goto done; | |
1814 | kvm_emulate_hypercall(ctxt->vcpu); | |
aca7f966 | 1815 | } else { |
e4e03ded | 1816 | rc = read_descriptor(ctxt, ops, c->src.ptr, |
aca7f966 | 1817 | &size, &address, |
e4e03ded | 1818 | c->op_bytes); |
aca7f966 AL |
1819 | if (rc) |
1820 | goto done; | |
1821 | realmode_lidt(ctxt->vcpu, size, address); | |
1822 | } | |
16286d08 AK |
1823 | /* Disable writeback. */ |
1824 | c->dst.type = OP_NONE; | |
6aa8b732 AK |
1825 | break; |
1826 | case 4: /* smsw */ | |
16286d08 AK |
1827 | c->dst.bytes = 2; |
1828 | c->dst.val = realmode_get_cr(ctxt->vcpu, 0); | |
6aa8b732 AK |
1829 | break; |
1830 | case 6: /* lmsw */ | |
16286d08 AK |
1831 | realmode_lmsw(ctxt->vcpu, (u16)c->src.val, |
1832 | &ctxt->eflags); | |
dc7457ea | 1833 | c->dst.type = OP_NONE; |
6aa8b732 AK |
1834 | break; |
1835 | case 7: /* invlpg*/ | |
e8d8d7fe | 1836 | emulate_invlpg(ctxt->vcpu, memop); |
16286d08 AK |
1837 | /* Disable writeback. */ |
1838 | c->dst.type = OP_NONE; | |
6aa8b732 AK |
1839 | break; |
1840 | default: | |
1841 | goto cannot_emulate; | |
1842 | } | |
1843 | break; | |
018a98db AK |
1844 | case 0x06: |
1845 | emulate_clts(ctxt->vcpu); | |
1846 | c->dst.type = OP_NONE; | |
1847 | break; | |
1848 | case 0x08: /* invd */ | |
1849 | case 0x09: /* wbinvd */ | |
1850 | case 0x0d: /* GrpP (prefetch) */ | |
1851 | case 0x18: /* Grp16 (prefetch/nop) */ | |
1852 | c->dst.type = OP_NONE; | |
1853 | break; | |
1854 | case 0x20: /* mov cr, reg */ | |
1855 | if (c->modrm_mod != 3) | |
1856 | goto cannot_emulate; | |
1857 | c->regs[c->modrm_rm] = | |
1858 | realmode_get_cr(ctxt->vcpu, c->modrm_reg); | |
1859 | c->dst.type = OP_NONE; /* no writeback */ | |
1860 | break; | |
6aa8b732 | 1861 | case 0x21: /* mov from dr to reg */ |
e4e03ded | 1862 | if (c->modrm_mod != 3) |
6aa8b732 | 1863 | goto cannot_emulate; |
8cdbd2c9 | 1864 | rc = emulator_get_dr(ctxt, c->modrm_reg, &c->regs[c->modrm_rm]); |
a01af5ec LV |
1865 | if (rc) |
1866 | goto cannot_emulate; | |
1867 | c->dst.type = OP_NONE; /* no writeback */ | |
6aa8b732 | 1868 | break; |
018a98db AK |
1869 | case 0x22: /* mov reg, cr */ |
1870 | if (c->modrm_mod != 3) | |
1871 | goto cannot_emulate; | |
1872 | realmode_set_cr(ctxt->vcpu, | |
1873 | c->modrm_reg, c->modrm_val, &ctxt->eflags); | |
1874 | c->dst.type = OP_NONE; | |
1875 | break; | |
6aa8b732 | 1876 | case 0x23: /* mov from reg to dr */ |
e4e03ded | 1877 | if (c->modrm_mod != 3) |
6aa8b732 | 1878 | goto cannot_emulate; |
e4e03ded LV |
1879 | rc = emulator_set_dr(ctxt, c->modrm_reg, |
1880 | c->regs[c->modrm_rm]); | |
a01af5ec LV |
1881 | if (rc) |
1882 | goto cannot_emulate; | |
1883 | c->dst.type = OP_NONE; /* no writeback */ | |
6aa8b732 | 1884 | break; |
018a98db AK |
1885 | case 0x30: |
1886 | /* wrmsr */ | |
1887 | msr_data = (u32)c->regs[VCPU_REGS_RAX] | |
1888 | | ((u64)c->regs[VCPU_REGS_RDX] << 32); | |
1889 | rc = kvm_set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data); | |
1890 | if (rc) { | |
c1a5d4f9 | 1891 | kvm_inject_gp(ctxt->vcpu, 0); |
ad312c7c | 1892 | c->eip = ctxt->vcpu->arch.rip; |
018a98db AK |
1893 | } |
1894 | rc = X86EMUL_CONTINUE; | |
1895 | c->dst.type = OP_NONE; | |
1896 | break; | |
1897 | case 0x32: | |
1898 | /* rdmsr */ | |
1899 | rc = kvm_get_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], &msr_data); | |
1900 | if (rc) { | |
c1a5d4f9 | 1901 | kvm_inject_gp(ctxt->vcpu, 0); |
ad312c7c | 1902 | c->eip = ctxt->vcpu->arch.rip; |
018a98db AK |
1903 | } else { |
1904 | c->regs[VCPU_REGS_RAX] = (u32)msr_data; | |
1905 | c->regs[VCPU_REGS_RDX] = msr_data >> 32; | |
1906 | } | |
1907 | rc = X86EMUL_CONTINUE; | |
1908 | c->dst.type = OP_NONE; | |
1909 | break; | |
6aa8b732 | 1910 | case 0x40 ... 0x4f: /* cmov */ |
e4e03ded | 1911 | c->dst.val = c->dst.orig_val = c->src.val; |
a01af5ec LV |
1912 | if (!test_cc(c->b, ctxt->eflags)) |
1913 | c->dst.type = OP_NONE; /* no writeback */ | |
6aa8b732 | 1914 | break; |
018a98db AK |
1915 | case 0x80 ... 0x8f: /* jnz rel, etc*/ { |
1916 | long int rel; | |
1917 | ||
1918 | switch (c->op_bytes) { | |
1919 | case 2: | |
1920 | rel = insn_fetch(s16, 2, c->eip); | |
1921 | break; | |
1922 | case 4: | |
1923 | rel = insn_fetch(s32, 4, c->eip); | |
1924 | break; | |
1925 | case 8: | |
1926 | rel = insn_fetch(s64, 8, c->eip); | |
1927 | break; | |
1928 | default: | |
1929 | DPRINTF("jnz: Invalid op_bytes\n"); | |
1930 | goto cannot_emulate; | |
1931 | } | |
1932 | if (test_cc(c->b, ctxt->eflags)) | |
7a957275 | 1933 | jmp_rel(c, rel); |
018a98db AK |
1934 | c->dst.type = OP_NONE; |
1935 | break; | |
1936 | } | |
7de75248 NK |
1937 | case 0xa3: |
1938 | bt: /* bt */ | |
e4f8e039 | 1939 | c->dst.type = OP_NONE; |
e4e03ded LV |
1940 | /* only subword offset */ |
1941 | c->src.val &= (c->dst.bytes << 3) - 1; | |
05f086f8 | 1942 | emulate_2op_SrcV_nobyte("bt", c->src, c->dst, ctxt->eflags); |
7de75248 NK |
1943 | break; |
1944 | case 0xab: | |
1945 | bts: /* bts */ | |
e4e03ded LV |
1946 | /* only subword offset */ |
1947 | c->src.val &= (c->dst.bytes << 3) - 1; | |
05f086f8 | 1948 | emulate_2op_SrcV_nobyte("bts", c->src, c->dst, ctxt->eflags); |
7de75248 | 1949 | break; |
6aa8b732 AK |
1950 | case 0xb0 ... 0xb1: /* cmpxchg */ |
1951 | /* | |
1952 | * Save real source value, then compare EAX against | |
1953 | * destination. | |
1954 | */ | |
e4e03ded LV |
1955 | c->src.orig_val = c->src.val; |
1956 | c->src.val = c->regs[VCPU_REGS_RAX]; | |
05f086f8 LV |
1957 | emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags); |
1958 | if (ctxt->eflags & EFLG_ZF) { | |
6aa8b732 | 1959 | /* Success: write back to memory. */ |
e4e03ded | 1960 | c->dst.val = c->src.orig_val; |
6aa8b732 AK |
1961 | } else { |
1962 | /* Failure: write the value we saw to EAX. */ | |
e4e03ded LV |
1963 | c->dst.type = OP_REG; |
1964 | c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX]; | |
6aa8b732 AK |
1965 | } |
1966 | break; | |
6aa8b732 AK |
1967 | case 0xb3: |
1968 | btr: /* btr */ | |
e4e03ded LV |
1969 | /* only subword offset */ |
1970 | c->src.val &= (c->dst.bytes << 3) - 1; | |
05f086f8 | 1971 | emulate_2op_SrcV_nobyte("btr", c->src, c->dst, ctxt->eflags); |
6aa8b732 | 1972 | break; |
6aa8b732 | 1973 | case 0xb6 ... 0xb7: /* movzx */ |
e4e03ded LV |
1974 | c->dst.bytes = c->op_bytes; |
1975 | c->dst.val = (c->d & ByteOp) ? (u8) c->src.val | |
1976 | : (u16) c->src.val; | |
6aa8b732 | 1977 | break; |
6aa8b732 | 1978 | case 0xba: /* Grp8 */ |
e4e03ded | 1979 | switch (c->modrm_reg & 3) { |
6aa8b732 AK |
1980 | case 0: |
1981 | goto bt; | |
1982 | case 1: | |
1983 | goto bts; | |
1984 | case 2: | |
1985 | goto btr; | |
1986 | case 3: | |
1987 | goto btc; | |
1988 | } | |
1989 | break; | |
7de75248 NK |
1990 | case 0xbb: |
1991 | btc: /* btc */ | |
e4e03ded LV |
1992 | /* only subword offset */ |
1993 | c->src.val &= (c->dst.bytes << 3) - 1; | |
05f086f8 | 1994 | emulate_2op_SrcV_nobyte("btc", c->src, c->dst, ctxt->eflags); |
7de75248 | 1995 | break; |
6aa8b732 | 1996 | case 0xbe ... 0xbf: /* movsx */ |
e4e03ded LV |
1997 | c->dst.bytes = c->op_bytes; |
1998 | c->dst.val = (c->d & ByteOp) ? (s8) c->src.val : | |
1999 | (s16) c->src.val; | |
6aa8b732 | 2000 | break; |
a012e65a | 2001 | case 0xc3: /* movnti */ |
e4e03ded LV |
2002 | c->dst.bytes = c->op_bytes; |
2003 | c->dst.val = (c->op_bytes == 4) ? (u32) c->src.val : | |
2004 | (u64) c->src.val; | |
a012e65a | 2005 | break; |
6aa8b732 | 2006 | case 0xc7: /* Grp9 (cmpxchg8b) */ |
e8d8d7fe | 2007 | rc = emulate_grp9(ctxt, ops, memop); |
8cdbd2c9 LV |
2008 | if (rc != 0) |
2009 | goto done; | |
018a98db | 2010 | c->dst.type = OP_NONE; |
8cdbd2c9 | 2011 | break; |
6aa8b732 AK |
2012 | } |
2013 | goto writeback; | |
2014 | ||
2015 | cannot_emulate: | |
e4e03ded | 2016 | DPRINTF("Cannot emulate %02x\n", c->b); |
3427318f | 2017 | c->eip = saved_eip; |
6aa8b732 AK |
2018 | return -1; |
2019 | } |