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6aa8b732 | 1 | /****************************************************************************** |
56e82318 | 2 | * emulate.c |
6aa8b732 AK |
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 | |
221d059d | 12 | * Copyright 2010 Red Hat, Inc. and/or its affilates. |
6aa8b732 AK |
13 | * |
14 | * Avi Kivity <avi@qumranet.com> | |
15 | * Yaniv Kamay <yaniv@qumranet.com> | |
16 | * | |
17 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
18 | * the COPYING file in the top-level directory. | |
19 | * | |
20 | * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4 | |
21 | */ | |
22 | ||
23 | #ifndef __KERNEL__ | |
24 | #include <stdio.h> | |
25 | #include <stdint.h> | |
26 | #include <public/xen.h> | |
d77c26fc | 27 | #define DPRINTF(_f, _a ...) printf(_f , ## _a) |
6aa8b732 | 28 | #else |
edf88417 | 29 | #include <linux/kvm_host.h> |
5fdbf976 | 30 | #include "kvm_cache_regs.h" |
6aa8b732 AK |
31 | #define DPRINTF(x...) do {} while (0) |
32 | #endif | |
6aa8b732 | 33 | #include <linux/module.h> |
56e82318 | 34 | #include <asm/kvm_emulate.h> |
6aa8b732 | 35 | |
3eeb3288 | 36 | #include "x86.h" |
38ba30ba | 37 | #include "tss.h" |
e99f0507 | 38 | |
6aa8b732 AK |
39 | /* |
40 | * Opcode effective-address decode tables. | |
41 | * Note that we only emulate instructions that have at least one memory | |
42 | * operand (excluding implicit stack references). We assume that stack | |
43 | * references and instruction fetches will never occur in special memory | |
44 | * areas that require emulation. So, for example, 'mov <imm>,<reg>' need | |
45 | * not be handled. | |
46 | */ | |
47 | ||
48 | /* Operand sizes: 8-bit operands or specified/overridden size. */ | |
2ce49536 | 49 | #define ByteOp (1<<16) /* 8-bit operands. */ |
6aa8b732 | 50 | /* Destination operand type. */ |
2ce49536 AK |
51 | #define ImplicitOps (1<<17) /* Implicit in opcode. No generic decode. */ |
52 | #define DstReg (2<<17) /* Register operand. */ | |
53 | #define DstMem (3<<17) /* Memory operand. */ | |
54 | #define DstAcc (4<<17) /* Destination Accumulator */ | |
55 | #define DstDI (5<<17) /* Destination is in ES:(E)DI */ | |
56 | #define DstMem64 (6<<17) /* 64bit memory operand */ | |
57 | #define DstMask (7<<17) | |
6aa8b732 | 58 | /* Source operand type. */ |
9c9fddd0 GT |
59 | #define SrcNone (0<<4) /* No source operand. */ |
60 | #define SrcImplicit (0<<4) /* Source operand is implicit in the opcode. */ | |
61 | #define SrcReg (1<<4) /* Register operand. */ | |
62 | #define SrcMem (2<<4) /* Memory operand. */ | |
63 | #define SrcMem16 (3<<4) /* Memory operand (16-bit). */ | |
64 | #define SrcMem32 (4<<4) /* Memory operand (32-bit). */ | |
65 | #define SrcImm (5<<4) /* Immediate operand. */ | |
66 | #define SrcImmByte (6<<4) /* 8-bit sign-extended immediate operand. */ | |
bfcadf83 | 67 | #define SrcOne (7<<4) /* Implied '1' */ |
341de7e3 | 68 | #define SrcImmUByte (8<<4) /* 8-bit unsigned immediate operand. */ |
c9eaf20f | 69 | #define SrcImmU (9<<4) /* Immediate operand, unsigned */ |
a682e354 | 70 | #define SrcSI (0xa<<4) /* Source is in the DS:RSI */ |
414e6277 GN |
71 | #define SrcImmFAddr (0xb<<4) /* Source is immediate far address */ |
72 | #define SrcMemFAddr (0xc<<4) /* Source is far address in memory */ | |
5d55f299 | 73 | #define SrcAcc (0xd<<4) /* Source Accumulator */ |
341de7e3 | 74 | #define SrcMask (0xf<<4) |
6aa8b732 | 75 | /* Generic ModRM decode. */ |
341de7e3 | 76 | #define ModRM (1<<8) |
6aa8b732 | 77 | /* Destination is only written; never read. */ |
341de7e3 GN |
78 | #define Mov (1<<9) |
79 | #define BitOp (1<<10) | |
80 | #define MemAbs (1<<11) /* Memory operand is absolute displacement */ | |
9c9fddd0 GT |
81 | #define String (1<<12) /* String instruction (rep capable) */ |
82 | #define Stack (1<<13) /* Stack instruction (push/pop) */ | |
e09d082c AK |
83 | #define Group (1<<14) /* Bits 3:5 of modrm byte extend opcode */ |
84 | #define GroupDual (1<<15) /* Alternate decoding of mod == 3 */ | |
2ce49536 | 85 | #define GroupMask 0x0f /* Group number stored in bits 0:3 */ |
d8769fed | 86 | /* Misc flags */ |
d380a5e4 | 87 | #define Lock (1<<26) /* lock prefix is allowed for the instruction */ |
e92805ac | 88 | #define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */ |
d8769fed | 89 | #define No64 (1<<28) |
0dc8d10f GT |
90 | /* Source 2 operand type */ |
91 | #define Src2None (0<<29) | |
92 | #define Src2CL (1<<29) | |
93 | #define Src2ImmByte (2<<29) | |
94 | #define Src2One (3<<29) | |
95 | #define Src2Mask (7<<29) | |
6aa8b732 | 96 | |
83babbca AK |
97 | #define X2(x) (x), (x) |
98 | #define X3(x) X2(x), (x) | |
99 | #define X4(x) X2(x), X2(x) | |
100 | #define X5(x) X4(x), (x) | |
101 | #define X6(x) X4(x), X2(x) | |
102 | #define X7(x) X4(x), X3(x) | |
103 | #define X8(x) X4(x), X4(x) | |
104 | #define X16(x) X8(x), X8(x) | |
105 | ||
43bb19cd | 106 | enum { |
1d6ad207 | 107 | Group1_80, Group1_81, Group1_82, Group1_83, |
d95058a1 | 108 | Group1A, Group3_Byte, Group3, Group4, Group5, Group7, |
60a29d4e | 109 | Group8, Group9, |
43bb19cd AK |
110 | }; |
111 | ||
45ed60b3 | 112 | static u32 opcode_table[256] = { |
6aa8b732 | 113 | /* 0x00 - 0x07 */ |
d380a5e4 | 114 | ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock, |
6aa8b732 | 115 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, |
0934ac9d | 116 | ByteOp | DstAcc | SrcImm, DstAcc | SrcImm, |
d8769fed | 117 | ImplicitOps | Stack | No64, ImplicitOps | Stack | No64, |
6aa8b732 | 118 | /* 0x08 - 0x0F */ |
d380a5e4 | 119 | ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock, |
6aa8b732 | 120 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, |
94677e61 MG |
121 | ByteOp | DstAcc | SrcImm, DstAcc | SrcImm, |
122 | ImplicitOps | Stack | No64, 0, | |
6aa8b732 | 123 | /* 0x10 - 0x17 */ |
d380a5e4 | 124 | ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock, |
6aa8b732 | 125 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, |
0934ac9d | 126 | ByteOp | DstAcc | SrcImm, DstAcc | SrcImm, |
d8769fed | 127 | ImplicitOps | Stack | No64, ImplicitOps | Stack | No64, |
6aa8b732 | 128 | /* 0x18 - 0x1F */ |
d380a5e4 | 129 | ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock, |
6aa8b732 | 130 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, |
0934ac9d | 131 | ByteOp | DstAcc | SrcImm, DstAcc | SrcImm, |
d8769fed | 132 | ImplicitOps | Stack | No64, ImplicitOps | Stack | No64, |
6aa8b732 | 133 | /* 0x20 - 0x27 */ |
d380a5e4 | 134 | ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock, |
6aa8b732 | 135 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, |
e97e883f | 136 | ByteOp | DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0, |
6aa8b732 | 137 | /* 0x28 - 0x2F */ |
d380a5e4 | 138 | ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock, |
6aa8b732 | 139 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, |
abc19083 | 140 | ByteOp | DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0, |
6aa8b732 | 141 | /* 0x30 - 0x37 */ |
d380a5e4 | 142 | ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock, |
6aa8b732 | 143 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, |
222b7c52 | 144 | ByteOp | DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0, |
6aa8b732 AK |
145 | /* 0x38 - 0x3F */ |
146 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
147 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
8a9fee67 GT |
148 | ByteOp | DstAcc | SrcImm, DstAcc | SrcImm, |
149 | 0, 0, | |
749358a6 AK |
150 | /* 0x40 - 0x4F */ |
151 | X16(DstReg), | |
7f0aaee0 | 152 | /* 0x50 - 0x57 */ |
3849186c | 153 | X8(SrcReg | Stack), |
7f0aaee0 | 154 | /* 0x58 - 0x5F */ |
3849186c | 155 | X8(DstReg | Stack), |
7d316911 | 156 | /* 0x60 - 0x67 */ |
abcf14b5 MG |
157 | ImplicitOps | Stack | No64, ImplicitOps | Stack | No64, |
158 | 0, DstReg | SrcMem32 | ModRM | Mov /* movsxd (x86/64) */ , | |
7d316911 NK |
159 | 0, 0, 0, 0, |
160 | /* 0x68 - 0x6F */ | |
91ed7a0e | 161 | SrcImm | Mov | Stack, 0, SrcImmByte | Mov | Stack, 0, |
7972995b GN |
162 | DstDI | ByteOp | Mov | String, DstDI | Mov | String, /* insb, insw/insd */ |
163 | SrcSI | ByteOp | ImplicitOps | String, SrcSI | ImplicitOps | String, /* outsb, outsw/outsd */ | |
b3ab3405 AK |
164 | /* 0x70 - 0x7F */ |
165 | X16(SrcImmByte), | |
6aa8b732 | 166 | /* 0x80 - 0x87 */ |
1d6ad207 AK |
167 | Group | Group1_80, Group | Group1_81, |
168 | Group | Group1_82, Group | Group1_83, | |
6aa8b732 | 169 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, |
d380a5e4 | 170 | ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock, |
6aa8b732 AK |
171 | /* 0x88 - 0x8F */ |
172 | ByteOp | DstMem | SrcReg | ModRM | Mov, DstMem | SrcReg | ModRM | Mov, | |
173 | ByteOp | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
b16b2b7b | 174 | DstMem | SrcNone | ModRM | Mov, ModRM | DstReg, |
a5046e6c | 175 | ImplicitOps | SrcMem16 | ModRM, Group | Group1A, |
b13354f8 MG |
176 | /* 0x90 - 0x97 */ |
177 | DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, | |
178 | /* 0x98 - 0x9F */ | |
414e6277 | 179 | 0, 0, SrcImmFAddr | No64, 0, |
0654169e | 180 | ImplicitOps | Stack, ImplicitOps | Stack, 0, 0, |
6aa8b732 | 181 | /* 0xA0 - 0xA7 */ |
5d55f299 WY |
182 | ByteOp | DstAcc | SrcMem | Mov | MemAbs, DstAcc | SrcMem | Mov | MemAbs, |
183 | ByteOp | DstMem | SrcAcc | Mov | MemAbs, DstMem | SrcAcc | Mov | MemAbs, | |
a682e354 GN |
184 | ByteOp | SrcSI | DstDI | Mov | String, SrcSI | DstDI | Mov | String, |
185 | ByteOp | SrcSI | DstDI | String, SrcSI | DstDI | String, | |
6aa8b732 | 186 | /* 0xA8 - 0xAF */ |
dfb507c4 | 187 | DstAcc | SrcImmByte | ByteOp, DstAcc | SrcImm, ByteOp | DstDI | Mov | String, DstDI | Mov | String, |
a682e354 GN |
188 | ByteOp | SrcSI | DstAcc | Mov | String, SrcSI | DstAcc | Mov | String, |
189 | ByteOp | DstDI | String, DstDI | String, | |
a5e2e82b | 190 | /* 0xB0 - 0xB7 */ |
b6e61538 | 191 | X8(ByteOp | DstReg | SrcImm | Mov), |
a5e2e82b | 192 | /* 0xB8 - 0xBF */ |
b6e61538 | 193 | X8(DstReg | SrcImm | Mov), |
6aa8b732 | 194 | /* 0xC0 - 0xC7 */ |
d9413cd7 | 195 | ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImmByte | ModRM, |
6e3d5dfb | 196 | 0, ImplicitOps | Stack, 0, 0, |
d9413cd7 | 197 | ByteOp | DstMem | SrcImm | ModRM | Mov, DstMem | SrcImm | ModRM | Mov, |
6aa8b732 | 198 | /* 0xC8 - 0xCF */ |
e637b823 | 199 | 0, 0, 0, ImplicitOps | Stack, |
d8769fed | 200 | ImplicitOps, SrcImmByte, ImplicitOps | No64, ImplicitOps, |
6aa8b732 AK |
201 | /* 0xD0 - 0xD7 */ |
202 | ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM, | |
203 | ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM, | |
204 | 0, 0, 0, 0, | |
205 | /* 0xD8 - 0xDF */ | |
206 | 0, 0, 0, 0, 0, 0, 0, 0, | |
098c937b | 207 | /* 0xE0 - 0xE7 */ |
a6a3034c | 208 | 0, 0, 0, 0, |
cf8f70bf GN |
209 | ByteOp | SrcImmUByte | DstAcc, SrcImmUByte | DstAcc, |
210 | ByteOp | SrcImmUByte | DstAcc, SrcImmUByte | DstAcc, | |
098c937b | 211 | /* 0xE8 - 0xEF */ |
d53c4777 | 212 | SrcImm | Stack, SrcImm | ImplicitOps, |
414e6277 | 213 | SrcImmFAddr | No64, SrcImmByte | ImplicitOps, |
cf8f70bf GN |
214 | SrcNone | ByteOp | DstAcc, SrcNone | DstAcc, |
215 | SrcNone | ByteOp | DstAcc, SrcNone | DstAcc, | |
6aa8b732 AK |
216 | /* 0xF0 - 0xF7 */ |
217 | 0, 0, 0, 0, | |
e92805ac | 218 | ImplicitOps | Priv, ImplicitOps, Group | Group3_Byte, Group | Group3, |
6aa8b732 | 219 | /* 0xF8 - 0xFF */ |
b284be57 | 220 | ImplicitOps, 0, ImplicitOps, ImplicitOps, |
fb4616f4 | 221 | ImplicitOps, ImplicitOps, Group | Group4, Group | Group5, |
6aa8b732 AK |
222 | }; |
223 | ||
45ed60b3 | 224 | static u32 twobyte_table[256] = { |
6aa8b732 | 225 | /* 0x00 - 0x0F */ |
e92805ac GN |
226 | 0, Group | GroupDual | Group7, 0, 0, |
227 | 0, ImplicitOps, ImplicitOps | Priv, 0, | |
228 | ImplicitOps | Priv, ImplicitOps | Priv, 0, 0, | |
229 | 0, ImplicitOps | ModRM, 0, 0, | |
6aa8b732 AK |
230 | /* 0x10 - 0x1F */ |
231 | 0, 0, 0, 0, 0, 0, 0, 0, ImplicitOps | ModRM, 0, 0, 0, 0, 0, 0, 0, | |
232 | /* 0x20 - 0x2F */ | |
e92805ac GN |
233 | ModRM | ImplicitOps | Priv, ModRM | Priv, |
234 | ModRM | ImplicitOps | Priv, ModRM | Priv, | |
235 | 0, 0, 0, 0, | |
6aa8b732 AK |
236 | 0, 0, 0, 0, 0, 0, 0, 0, |
237 | /* 0x30 - 0x3F */ | |
e92805ac GN |
238 | ImplicitOps | Priv, 0, ImplicitOps | Priv, 0, |
239 | ImplicitOps, ImplicitOps | Priv, 0, 0, | |
e99f0507 | 240 | 0, 0, 0, 0, 0, 0, 0, 0, |
be8eacdd AK |
241 | /* 0x40 - 0x4F */ |
242 | X16(DstReg | SrcMem | ModRM | Mov), | |
6aa8b732 AK |
243 | /* 0x50 - 0x5F */ |
244 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
245 | /* 0x60 - 0x6F */ | |
246 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
247 | /* 0x70 - 0x7F */ | |
248 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
249 | /* 0x80 - 0x8F */ | |
880a1883 | 250 | X16(SrcImm), |
6aa8b732 AK |
251 | /* 0x90 - 0x9F */ |
252 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
253 | /* 0xA0 - 0xA7 */ | |
0934ac9d MG |
254 | ImplicitOps | Stack, ImplicitOps | Stack, |
255 | 0, DstMem | SrcReg | ModRM | BitOp, | |
9bf8ea42 GT |
256 | DstMem | SrcReg | Src2ImmByte | ModRM, |
257 | DstMem | SrcReg | Src2CL | ModRM, 0, 0, | |
6aa8b732 | 258 | /* 0xA8 - 0xAF */ |
0934ac9d | 259 | ImplicitOps | Stack, ImplicitOps | Stack, |
d380a5e4 | 260 | 0, DstMem | SrcReg | ModRM | BitOp | Lock, |
9bf8ea42 GT |
261 | DstMem | SrcReg | Src2ImmByte | ModRM, |
262 | DstMem | SrcReg | Src2CL | ModRM, | |
263 | ModRM, 0, | |
6aa8b732 | 264 | /* 0xB0 - 0xB7 */ |
d380a5e4 GN |
265 | ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock, |
266 | 0, DstMem | SrcReg | ModRM | BitOp | Lock, | |
6aa8b732 AK |
267 | 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov, |
268 | DstReg | SrcMem16 | ModRM | Mov, | |
269 | /* 0xB8 - 0xBF */ | |
d380a5e4 GN |
270 | 0, 0, |
271 | Group | Group8, DstMem | SrcReg | ModRM | BitOp | Lock, | |
6aa8b732 AK |
272 | 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov, |
273 | DstReg | SrcMem16 | ModRM | Mov, | |
274 | /* 0xC0 - 0xCF */ | |
60a29d4e GN |
275 | 0, 0, 0, DstMem | SrcReg | ModRM | Mov, |
276 | 0, 0, 0, Group | GroupDual | Group9, | |
a012e65a | 277 | 0, 0, 0, 0, 0, 0, 0, 0, |
6aa8b732 AK |
278 | /* 0xD0 - 0xDF */ |
279 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
280 | /* 0xE0 - 0xEF */ | |
281 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
282 | /* 0xF0 - 0xFF */ | |
283 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
284 | }; | |
285 | ||
45ed60b3 | 286 | static u32 group_table[] = { |
1d6ad207 | 287 | [Group1_80*8] = |
d380a5e4 GN |
288 | ByteOp | DstMem | SrcImm | ModRM | Lock, |
289 | ByteOp | DstMem | SrcImm | ModRM | Lock, | |
290 | ByteOp | DstMem | SrcImm | ModRM | Lock, | |
291 | ByteOp | DstMem | SrcImm | ModRM | Lock, | |
292 | ByteOp | DstMem | SrcImm | ModRM | Lock, | |
293 | ByteOp | DstMem | SrcImm | ModRM | Lock, | |
294 | ByteOp | DstMem | SrcImm | ModRM | Lock, | |
295 | ByteOp | DstMem | SrcImm | ModRM, | |
1d6ad207 | 296 | [Group1_81*8] = |
d380a5e4 GN |
297 | DstMem | SrcImm | ModRM | Lock, |
298 | DstMem | SrcImm | ModRM | Lock, | |
299 | DstMem | SrcImm | ModRM | Lock, | |
300 | DstMem | SrcImm | ModRM | Lock, | |
301 | DstMem | SrcImm | ModRM | Lock, | |
302 | DstMem | SrcImm | ModRM | Lock, | |
303 | DstMem | SrcImm | ModRM | Lock, | |
304 | DstMem | SrcImm | ModRM, | |
1d6ad207 | 305 | [Group1_82*8] = |
e424e191 GN |
306 | ByteOp | DstMem | SrcImm | ModRM | No64 | Lock, |
307 | ByteOp | DstMem | SrcImm | ModRM | No64 | Lock, | |
308 | ByteOp | DstMem | SrcImm | ModRM | No64 | Lock, | |
309 | ByteOp | DstMem | SrcImm | ModRM | No64 | Lock, | |
310 | ByteOp | DstMem | SrcImm | ModRM | No64 | Lock, | |
311 | ByteOp | DstMem | SrcImm | ModRM | No64 | Lock, | |
312 | ByteOp | DstMem | SrcImm | ModRM | No64 | Lock, | |
313 | ByteOp | DstMem | SrcImm | ModRM | No64, | |
1d6ad207 | 314 | [Group1_83*8] = |
d380a5e4 GN |
315 | DstMem | SrcImmByte | ModRM | Lock, |
316 | DstMem | SrcImmByte | ModRM | Lock, | |
317 | DstMem | SrcImmByte | ModRM | Lock, | |
318 | DstMem | SrcImmByte | ModRM | Lock, | |
319 | DstMem | SrcImmByte | ModRM | Lock, | |
320 | DstMem | SrcImmByte | ModRM | Lock, | |
321 | DstMem | SrcImmByte | ModRM | Lock, | |
322 | DstMem | SrcImmByte | ModRM, | |
43bb19cd AK |
323 | [Group1A*8] = |
324 | DstMem | SrcNone | ModRM | Mov | Stack, 0, 0, 0, 0, 0, 0, 0, | |
7d858a19 | 325 | [Group3_Byte*8] = |
7d5993d6 | 326 | ByteOp | SrcImm | DstMem | ModRM, ByteOp | SrcImm | DstMem | ModRM, |
7d858a19 AK |
327 | ByteOp | DstMem | SrcNone | ModRM, ByteOp | DstMem | SrcNone | ModRM, |
328 | 0, 0, 0, 0, | |
329 | [Group3*8] = | |
7d5993d6 | 330 | DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM, |
6eb06cb2 | 331 | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM, |
7d858a19 | 332 | 0, 0, 0, 0, |
fd60754e | 333 | [Group4*8] = |
c0e0608c | 334 | ByteOp | DstMem | SrcNone | ModRM | Lock, ByteOp | DstMem | SrcNone | ModRM | Lock, |
fd60754e AK |
335 | 0, 0, 0, 0, 0, 0, |
336 | [Group5*8] = | |
c0e0608c | 337 | DstMem | SrcNone | ModRM | Lock, DstMem | SrcNone | ModRM | Lock, |
d19292e4 | 338 | SrcMem | ModRM | Stack, 0, |
414e6277 | 339 | SrcMem | ModRM | Stack, SrcMemFAddr | ModRM | ImplicitOps, |
ea79849d | 340 | SrcMem | ModRM | Stack, 0, |
d95058a1 | 341 | [Group7*8] = |
e92805ac | 342 | 0, 0, ModRM | SrcMem | Priv, ModRM | SrcMem | Priv, |
16286d08 | 343 | SrcNone | ModRM | DstMem | Mov, 0, |
e92805ac | 344 | SrcMem16 | ModRM | Mov | Priv, SrcMem | ModRM | ByteOp | Priv, |
2db2c2eb GN |
345 | [Group8*8] = |
346 | 0, 0, 0, 0, | |
d380a5e4 GN |
347 | DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM | Lock, |
348 | DstMem | SrcImmByte | ModRM | Lock, DstMem | SrcImmByte | ModRM | Lock, | |
60a29d4e | 349 | [Group9*8] = |
6550e1f1 | 350 | 0, DstMem64 | ModRM | Lock, 0, 0, 0, 0, 0, 0, |
e09d082c AK |
351 | }; |
352 | ||
45ed60b3 | 353 | static u32 group2_table[] = { |
d95058a1 | 354 | [Group7*8] = |
835e6b80 | 355 | SrcNone | ModRM | Priv, 0, 0, SrcNone | ModRM | Priv, |
16286d08 | 356 | SrcNone | ModRM | DstMem | Mov, 0, |
835e6b80 | 357 | SrcMem16 | ModRM | Mov | Priv, 0, |
60a29d4e GN |
358 | [Group9*8] = |
359 | 0, 0, 0, 0, 0, 0, 0, 0, | |
e09d082c AK |
360 | }; |
361 | ||
6aa8b732 | 362 | /* EFLAGS bit definitions. */ |
d4c6a154 GN |
363 | #define EFLG_ID (1<<21) |
364 | #define EFLG_VIP (1<<20) | |
365 | #define EFLG_VIF (1<<19) | |
366 | #define EFLG_AC (1<<18) | |
b1d86143 AP |
367 | #define EFLG_VM (1<<17) |
368 | #define EFLG_RF (1<<16) | |
d4c6a154 GN |
369 | #define EFLG_IOPL (3<<12) |
370 | #define EFLG_NT (1<<14) | |
6aa8b732 AK |
371 | #define EFLG_OF (1<<11) |
372 | #define EFLG_DF (1<<10) | |
b1d86143 | 373 | #define EFLG_IF (1<<9) |
d4c6a154 | 374 | #define EFLG_TF (1<<8) |
6aa8b732 AK |
375 | #define EFLG_SF (1<<7) |
376 | #define EFLG_ZF (1<<6) | |
377 | #define EFLG_AF (1<<4) | |
378 | #define EFLG_PF (1<<2) | |
379 | #define EFLG_CF (1<<0) | |
380 | ||
381 | /* | |
382 | * Instruction emulation: | |
383 | * Most instructions are emulated directly via a fragment of inline assembly | |
384 | * code. This allows us to save/restore EFLAGS and thus very easily pick up | |
385 | * any modified flags. | |
386 | */ | |
387 | ||
05b3e0c2 | 388 | #if defined(CONFIG_X86_64) |
6aa8b732 AK |
389 | #define _LO32 "k" /* force 32-bit operand */ |
390 | #define _STK "%%rsp" /* stack pointer */ | |
391 | #elif defined(__i386__) | |
392 | #define _LO32 "" /* force 32-bit operand */ | |
393 | #define _STK "%%esp" /* stack pointer */ | |
394 | #endif | |
395 | ||
396 | /* | |
397 | * These EFLAGS bits are restored from saved value during emulation, and | |
398 | * any changes are written back to the saved value after emulation. | |
399 | */ | |
400 | #define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF) | |
401 | ||
402 | /* Before executing instruction: restore necessary bits in EFLAGS. */ | |
e934c9c1 AK |
403 | #define _PRE_EFLAGS(_sav, _msk, _tmp) \ |
404 | /* EFLAGS = (_sav & _msk) | (EFLAGS & ~_msk); _sav &= ~_msk; */ \ | |
405 | "movl %"_sav",%"_LO32 _tmp"; " \ | |
406 | "push %"_tmp"; " \ | |
407 | "push %"_tmp"; " \ | |
408 | "movl %"_msk",%"_LO32 _tmp"; " \ | |
409 | "andl %"_LO32 _tmp",("_STK"); " \ | |
410 | "pushf; " \ | |
411 | "notl %"_LO32 _tmp"; " \ | |
412 | "andl %"_LO32 _tmp",("_STK"); " \ | |
413 | "andl %"_LO32 _tmp","__stringify(BITS_PER_LONG/4)"("_STK"); " \ | |
414 | "pop %"_tmp"; " \ | |
415 | "orl %"_LO32 _tmp",("_STK"); " \ | |
416 | "popf; " \ | |
417 | "pop %"_sav"; " | |
6aa8b732 AK |
418 | |
419 | /* After executing instruction: write-back necessary bits in EFLAGS. */ | |
420 | #define _POST_EFLAGS(_sav, _msk, _tmp) \ | |
421 | /* _sav |= EFLAGS & _msk; */ \ | |
422 | "pushf; " \ | |
423 | "pop %"_tmp"; " \ | |
424 | "andl %"_msk",%"_LO32 _tmp"; " \ | |
425 | "orl %"_LO32 _tmp",%"_sav"; " | |
426 | ||
dda96d8f AK |
427 | #ifdef CONFIG_X86_64 |
428 | #define ON64(x) x | |
429 | #else | |
430 | #define ON64(x) | |
431 | #endif | |
432 | ||
6b7ad61f AK |
433 | #define ____emulate_2op(_op, _src, _dst, _eflags, _x, _y, _suffix) \ |
434 | do { \ | |
435 | __asm__ __volatile__ ( \ | |
436 | _PRE_EFLAGS("0", "4", "2") \ | |
437 | _op _suffix " %"_x"3,%1; " \ | |
438 | _POST_EFLAGS("0", "4", "2") \ | |
439 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
440 | "=&r" (_tmp) \ | |
441 | : _y ((_src).val), "i" (EFLAGS_MASK)); \ | |
f3fd92fb | 442 | } while (0) |
6b7ad61f AK |
443 | |
444 | ||
6aa8b732 AK |
445 | /* Raw emulation: instruction has two explicit operands. */ |
446 | #define __emulate_2op_nobyte(_op,_src,_dst,_eflags,_wx,_wy,_lx,_ly,_qx,_qy) \ | |
6b7ad61f AK |
447 | do { \ |
448 | unsigned long _tmp; \ | |
449 | \ | |
450 | switch ((_dst).bytes) { \ | |
451 | case 2: \ | |
452 | ____emulate_2op(_op,_src,_dst,_eflags,_wx,_wy,"w"); \ | |
453 | break; \ | |
454 | case 4: \ | |
455 | ____emulate_2op(_op,_src,_dst,_eflags,_lx,_ly,"l"); \ | |
456 | break; \ | |
457 | case 8: \ | |
458 | ON64(____emulate_2op(_op,_src,_dst,_eflags,_qx,_qy,"q")); \ | |
459 | break; \ | |
460 | } \ | |
6aa8b732 AK |
461 | } while (0) |
462 | ||
463 | #define __emulate_2op(_op,_src,_dst,_eflags,_bx,_by,_wx,_wy,_lx,_ly,_qx,_qy) \ | |
464 | do { \ | |
6b7ad61f | 465 | unsigned long _tmp; \ |
d77c26fc | 466 | switch ((_dst).bytes) { \ |
6aa8b732 | 467 | case 1: \ |
6b7ad61f | 468 | ____emulate_2op(_op,_src,_dst,_eflags,_bx,_by,"b"); \ |
6aa8b732 AK |
469 | break; \ |
470 | default: \ | |
471 | __emulate_2op_nobyte(_op, _src, _dst, _eflags, \ | |
472 | _wx, _wy, _lx, _ly, _qx, _qy); \ | |
473 | break; \ | |
474 | } \ | |
475 | } while (0) | |
476 | ||
477 | /* Source operand is byte-sized and may be restricted to just %cl. */ | |
478 | #define emulate_2op_SrcB(_op, _src, _dst, _eflags) \ | |
479 | __emulate_2op(_op, _src, _dst, _eflags, \ | |
480 | "b", "c", "b", "c", "b", "c", "b", "c") | |
481 | ||
482 | /* Source operand is byte, word, long or quad sized. */ | |
483 | #define emulate_2op_SrcV(_op, _src, _dst, _eflags) \ | |
484 | __emulate_2op(_op, _src, _dst, _eflags, \ | |
485 | "b", "q", "w", "r", _LO32, "r", "", "r") | |
486 | ||
487 | /* Source operand is word, long or quad sized. */ | |
488 | #define emulate_2op_SrcV_nobyte(_op, _src, _dst, _eflags) \ | |
489 | __emulate_2op_nobyte(_op, _src, _dst, _eflags, \ | |
490 | "w", "r", _LO32, "r", "", "r") | |
491 | ||
d175226a GT |
492 | /* Instruction has three operands and one operand is stored in ECX register */ |
493 | #define __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, _suffix, _type) \ | |
494 | do { \ | |
495 | unsigned long _tmp; \ | |
496 | _type _clv = (_cl).val; \ | |
497 | _type _srcv = (_src).val; \ | |
498 | _type _dstv = (_dst).val; \ | |
499 | \ | |
500 | __asm__ __volatile__ ( \ | |
501 | _PRE_EFLAGS("0", "5", "2") \ | |
502 | _op _suffix " %4,%1 \n" \ | |
503 | _POST_EFLAGS("0", "5", "2") \ | |
504 | : "=m" (_eflags), "+r" (_dstv), "=&r" (_tmp) \ | |
505 | : "c" (_clv) , "r" (_srcv), "i" (EFLAGS_MASK) \ | |
506 | ); \ | |
507 | \ | |
508 | (_cl).val = (unsigned long) _clv; \ | |
509 | (_src).val = (unsigned long) _srcv; \ | |
510 | (_dst).val = (unsigned long) _dstv; \ | |
511 | } while (0) | |
512 | ||
513 | #define emulate_2op_cl(_op, _cl, _src, _dst, _eflags) \ | |
514 | do { \ | |
515 | switch ((_dst).bytes) { \ | |
516 | case 2: \ | |
517 | __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \ | |
518 | "w", unsigned short); \ | |
519 | break; \ | |
520 | case 4: \ | |
521 | __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \ | |
522 | "l", unsigned int); \ | |
523 | break; \ | |
524 | case 8: \ | |
525 | ON64(__emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \ | |
526 | "q", unsigned long)); \ | |
527 | break; \ | |
528 | } \ | |
529 | } while (0) | |
530 | ||
dda96d8f | 531 | #define __emulate_1op(_op, _dst, _eflags, _suffix) \ |
6aa8b732 AK |
532 | do { \ |
533 | unsigned long _tmp; \ | |
534 | \ | |
dda96d8f AK |
535 | __asm__ __volatile__ ( \ |
536 | _PRE_EFLAGS("0", "3", "2") \ | |
537 | _op _suffix " %1; " \ | |
538 | _POST_EFLAGS("0", "3", "2") \ | |
539 | : "=m" (_eflags), "+m" ((_dst).val), \ | |
540 | "=&r" (_tmp) \ | |
541 | : "i" (EFLAGS_MASK)); \ | |
542 | } while (0) | |
543 | ||
544 | /* Instruction has only one explicit operand (no source operand). */ | |
545 | #define emulate_1op(_op, _dst, _eflags) \ | |
546 | do { \ | |
d77c26fc | 547 | switch ((_dst).bytes) { \ |
dda96d8f AK |
548 | case 1: __emulate_1op(_op, _dst, _eflags, "b"); break; \ |
549 | case 2: __emulate_1op(_op, _dst, _eflags, "w"); break; \ | |
550 | case 4: __emulate_1op(_op, _dst, _eflags, "l"); break; \ | |
551 | case 8: ON64(__emulate_1op(_op, _dst, _eflags, "q")); break; \ | |
6aa8b732 AK |
552 | } \ |
553 | } while (0) | |
554 | ||
6aa8b732 AK |
555 | /* Fetch next part of the instruction being emulated. */ |
556 | #define insn_fetch(_type, _size, _eip) \ | |
557 | ({ unsigned long _x; \ | |
62266869 | 558 | rc = do_insn_fetch(ctxt, ops, (_eip), &_x, (_size)); \ |
af5b4f7f | 559 | if (rc != X86EMUL_CONTINUE) \ |
6aa8b732 AK |
560 | goto done; \ |
561 | (_eip) += (_size); \ | |
562 | (_type)_x; \ | |
563 | }) | |
564 | ||
414e6277 GN |
565 | #define insn_fetch_arr(_arr, _size, _eip) \ |
566 | ({ rc = do_insn_fetch(ctxt, ops, (_eip), _arr, (_size)); \ | |
567 | if (rc != X86EMUL_CONTINUE) \ | |
568 | goto done; \ | |
569 | (_eip) += (_size); \ | |
570 | }) | |
571 | ||
ddcb2885 HH |
572 | static inline unsigned long ad_mask(struct decode_cache *c) |
573 | { | |
574 | return (1UL << (c->ad_bytes << 3)) - 1; | |
575 | } | |
576 | ||
6aa8b732 | 577 | /* Access/update address held in a register, based on addressing mode. */ |
e4706772 HH |
578 | static inline unsigned long |
579 | address_mask(struct decode_cache *c, unsigned long reg) | |
580 | { | |
581 | if (c->ad_bytes == sizeof(unsigned long)) | |
582 | return reg; | |
583 | else | |
584 | return reg & ad_mask(c); | |
585 | } | |
586 | ||
587 | static inline unsigned long | |
588 | register_address(struct decode_cache *c, unsigned long base, unsigned long reg) | |
589 | { | |
590 | return base + address_mask(c, reg); | |
591 | } | |
592 | ||
7a957275 HH |
593 | static inline void |
594 | register_address_increment(struct decode_cache *c, unsigned long *reg, int inc) | |
595 | { | |
596 | if (c->ad_bytes == sizeof(unsigned long)) | |
597 | *reg += inc; | |
598 | else | |
599 | *reg = (*reg & ~ad_mask(c)) | ((*reg + inc) & ad_mask(c)); | |
600 | } | |
6aa8b732 | 601 | |
7a957275 HH |
602 | static inline void jmp_rel(struct decode_cache *c, int rel) |
603 | { | |
604 | register_address_increment(c, &c->eip, rel); | |
605 | } | |
098c937b | 606 | |
7a5b56df AK |
607 | static void set_seg_override(struct decode_cache *c, int seg) |
608 | { | |
609 | c->has_seg_override = true; | |
610 | c->seg_override = seg; | |
611 | } | |
612 | ||
79168fd1 GN |
613 | static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, |
614 | struct x86_emulate_ops *ops, int seg) | |
7a5b56df AK |
615 | { |
616 | if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS) | |
617 | return 0; | |
618 | ||
79168fd1 | 619 | return ops->get_cached_segment_base(seg, ctxt->vcpu); |
7a5b56df AK |
620 | } |
621 | ||
622 | static unsigned long seg_override_base(struct x86_emulate_ctxt *ctxt, | |
79168fd1 | 623 | struct x86_emulate_ops *ops, |
7a5b56df AK |
624 | struct decode_cache *c) |
625 | { | |
626 | if (!c->has_seg_override) | |
627 | return 0; | |
628 | ||
79168fd1 | 629 | return seg_base(ctxt, ops, c->seg_override); |
7a5b56df AK |
630 | } |
631 | ||
79168fd1 GN |
632 | static unsigned long es_base(struct x86_emulate_ctxt *ctxt, |
633 | struct x86_emulate_ops *ops) | |
7a5b56df | 634 | { |
79168fd1 | 635 | return seg_base(ctxt, ops, VCPU_SREG_ES); |
7a5b56df AK |
636 | } |
637 | ||
79168fd1 GN |
638 | static unsigned long ss_base(struct x86_emulate_ctxt *ctxt, |
639 | struct x86_emulate_ops *ops) | |
7a5b56df | 640 | { |
79168fd1 | 641 | return seg_base(ctxt, ops, VCPU_SREG_SS); |
7a5b56df AK |
642 | } |
643 | ||
54b8486f GN |
644 | static void emulate_exception(struct x86_emulate_ctxt *ctxt, int vec, |
645 | u32 error, bool valid) | |
646 | { | |
647 | ctxt->exception = vec; | |
648 | ctxt->error_code = error; | |
649 | ctxt->error_code_valid = valid; | |
650 | ctxt->restart = false; | |
651 | } | |
652 | ||
653 | static void emulate_gp(struct x86_emulate_ctxt *ctxt, int err) | |
654 | { | |
655 | emulate_exception(ctxt, GP_VECTOR, err, true); | |
656 | } | |
657 | ||
658 | static void emulate_pf(struct x86_emulate_ctxt *ctxt, unsigned long addr, | |
659 | int err) | |
660 | { | |
661 | ctxt->cr2 = addr; | |
662 | emulate_exception(ctxt, PF_VECTOR, err, true); | |
663 | } | |
664 | ||
665 | static void emulate_ud(struct x86_emulate_ctxt *ctxt) | |
666 | { | |
667 | emulate_exception(ctxt, UD_VECTOR, 0, false); | |
668 | } | |
669 | ||
670 | static void emulate_ts(struct x86_emulate_ctxt *ctxt, int err) | |
671 | { | |
672 | emulate_exception(ctxt, TS_VECTOR, err, true); | |
673 | } | |
674 | ||
62266869 AK |
675 | static int do_fetch_insn_byte(struct x86_emulate_ctxt *ctxt, |
676 | struct x86_emulate_ops *ops, | |
2fb53ad8 | 677 | unsigned long eip, u8 *dest) |
62266869 AK |
678 | { |
679 | struct fetch_cache *fc = &ctxt->decode.fetch; | |
680 | int rc; | |
2fb53ad8 | 681 | int size, cur_size; |
62266869 | 682 | |
2fb53ad8 AK |
683 | if (eip == fc->end) { |
684 | cur_size = fc->end - fc->start; | |
685 | size = min(15UL - cur_size, PAGE_SIZE - offset_in_page(eip)); | |
686 | rc = ops->fetch(ctxt->cs_base + eip, fc->data + cur_size, | |
687 | size, ctxt->vcpu, NULL); | |
3e2815e9 | 688 | if (rc != X86EMUL_CONTINUE) |
62266869 | 689 | return rc; |
2fb53ad8 | 690 | fc->end += size; |
62266869 | 691 | } |
2fb53ad8 | 692 | *dest = fc->data[eip - fc->start]; |
3e2815e9 | 693 | return X86EMUL_CONTINUE; |
62266869 AK |
694 | } |
695 | ||
696 | static int do_insn_fetch(struct x86_emulate_ctxt *ctxt, | |
697 | struct x86_emulate_ops *ops, | |
698 | unsigned long eip, void *dest, unsigned size) | |
699 | { | |
3e2815e9 | 700 | int rc; |
62266869 | 701 | |
eb3c79e6 | 702 | /* x86 instructions are limited to 15 bytes. */ |
063db061 | 703 | if (eip + size - ctxt->eip > 15) |
eb3c79e6 | 704 | return X86EMUL_UNHANDLEABLE; |
62266869 AK |
705 | while (size--) { |
706 | rc = do_fetch_insn_byte(ctxt, ops, eip++, dest++); | |
3e2815e9 | 707 | if (rc != X86EMUL_CONTINUE) |
62266869 AK |
708 | return rc; |
709 | } | |
3e2815e9 | 710 | return X86EMUL_CONTINUE; |
62266869 AK |
711 | } |
712 | ||
1e3c5cb0 RR |
713 | /* |
714 | * Given the 'reg' portion of a ModRM byte, and a register block, return a | |
715 | * pointer into the block that addresses the relevant register. | |
716 | * @highbyte_regs specifies whether to decode AH,CH,DH,BH. | |
717 | */ | |
718 | static void *decode_register(u8 modrm_reg, unsigned long *regs, | |
719 | int highbyte_regs) | |
6aa8b732 AK |
720 | { |
721 | void *p; | |
722 | ||
723 | p = ®s[modrm_reg]; | |
724 | if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8) | |
725 | p = (unsigned char *)®s[modrm_reg & 3] + 1; | |
726 | return p; | |
727 | } | |
728 | ||
729 | static int read_descriptor(struct x86_emulate_ctxt *ctxt, | |
730 | struct x86_emulate_ops *ops, | |
731 | void *ptr, | |
732 | u16 *size, unsigned long *address, int op_bytes) | |
733 | { | |
734 | int rc; | |
735 | ||
736 | if (op_bytes == 2) | |
737 | op_bytes = 3; | |
738 | *address = 0; | |
cebff02b | 739 | rc = ops->read_std((unsigned long)ptr, (unsigned long *)size, 2, |
1871c602 | 740 | ctxt->vcpu, NULL); |
1b30eaa8 | 741 | if (rc != X86EMUL_CONTINUE) |
6aa8b732 | 742 | return rc; |
cebff02b | 743 | rc = ops->read_std((unsigned long)ptr + 2, address, op_bytes, |
1871c602 | 744 | ctxt->vcpu, NULL); |
6aa8b732 AK |
745 | return rc; |
746 | } | |
747 | ||
bbe9abbd NK |
748 | static int test_cc(unsigned int condition, unsigned int flags) |
749 | { | |
750 | int rc = 0; | |
751 | ||
752 | switch ((condition & 15) >> 1) { | |
753 | case 0: /* o */ | |
754 | rc |= (flags & EFLG_OF); | |
755 | break; | |
756 | case 1: /* b/c/nae */ | |
757 | rc |= (flags & EFLG_CF); | |
758 | break; | |
759 | case 2: /* z/e */ | |
760 | rc |= (flags & EFLG_ZF); | |
761 | break; | |
762 | case 3: /* be/na */ | |
763 | rc |= (flags & (EFLG_CF|EFLG_ZF)); | |
764 | break; | |
765 | case 4: /* s */ | |
766 | rc |= (flags & EFLG_SF); | |
767 | break; | |
768 | case 5: /* p/pe */ | |
769 | rc |= (flags & EFLG_PF); | |
770 | break; | |
771 | case 7: /* le/ng */ | |
772 | rc |= (flags & EFLG_ZF); | |
773 | /* fall through */ | |
774 | case 6: /* l/nge */ | |
775 | rc |= (!(flags & EFLG_SF) != !(flags & EFLG_OF)); | |
776 | break; | |
777 | } | |
778 | ||
779 | /* Odd condition identifiers (lsb == 1) have inverted sense. */ | |
780 | return (!!rc ^ (condition & 1)); | |
781 | } | |
782 | ||
3c118e24 AK |
783 | static void decode_register_operand(struct operand *op, |
784 | struct decode_cache *c, | |
3c118e24 AK |
785 | int inhibit_bytereg) |
786 | { | |
33615aa9 | 787 | unsigned reg = c->modrm_reg; |
9f1ef3f8 | 788 | int highbyte_regs = c->rex_prefix == 0; |
33615aa9 AK |
789 | |
790 | if (!(c->d & ModRM)) | |
791 | reg = (c->b & 7) | ((c->rex_prefix & 1) << 3); | |
3c118e24 AK |
792 | op->type = OP_REG; |
793 | if ((c->d & ByteOp) && !inhibit_bytereg) { | |
33615aa9 | 794 | op->ptr = decode_register(reg, c->regs, highbyte_regs); |
3c118e24 AK |
795 | op->val = *(u8 *)op->ptr; |
796 | op->bytes = 1; | |
797 | } else { | |
33615aa9 | 798 | op->ptr = decode_register(reg, c->regs, 0); |
3c118e24 AK |
799 | op->bytes = c->op_bytes; |
800 | switch (op->bytes) { | |
801 | case 2: | |
802 | op->val = *(u16 *)op->ptr; | |
803 | break; | |
804 | case 4: | |
805 | op->val = *(u32 *)op->ptr; | |
806 | break; | |
807 | case 8: | |
808 | op->val = *(u64 *) op->ptr; | |
809 | break; | |
810 | } | |
811 | } | |
812 | op->orig_val = op->val; | |
813 | } | |
814 | ||
1c73ef66 AK |
815 | static int decode_modrm(struct x86_emulate_ctxt *ctxt, |
816 | struct x86_emulate_ops *ops) | |
817 | { | |
818 | struct decode_cache *c = &ctxt->decode; | |
819 | u8 sib; | |
f5b4edcd | 820 | int index_reg = 0, base_reg = 0, scale; |
3e2815e9 | 821 | int rc = X86EMUL_CONTINUE; |
1c73ef66 AK |
822 | |
823 | if (c->rex_prefix) { | |
824 | c->modrm_reg = (c->rex_prefix & 4) << 1; /* REX.R */ | |
825 | index_reg = (c->rex_prefix & 2) << 2; /* REX.X */ | |
826 | c->modrm_rm = base_reg = (c->rex_prefix & 1) << 3; /* REG.B */ | |
827 | } | |
828 | ||
829 | c->modrm = insn_fetch(u8, 1, c->eip); | |
830 | c->modrm_mod |= (c->modrm & 0xc0) >> 6; | |
831 | c->modrm_reg |= (c->modrm & 0x38) >> 3; | |
832 | c->modrm_rm |= (c->modrm & 0x07); | |
833 | c->modrm_ea = 0; | |
834 | c->use_modrm_ea = 1; | |
835 | ||
836 | if (c->modrm_mod == 3) { | |
107d6d2e AK |
837 | c->modrm_ptr = decode_register(c->modrm_rm, |
838 | c->regs, c->d & ByteOp); | |
839 | c->modrm_val = *(unsigned long *)c->modrm_ptr; | |
1c73ef66 AK |
840 | return rc; |
841 | } | |
842 | ||
843 | if (c->ad_bytes == 2) { | |
844 | unsigned bx = c->regs[VCPU_REGS_RBX]; | |
845 | unsigned bp = c->regs[VCPU_REGS_RBP]; | |
846 | unsigned si = c->regs[VCPU_REGS_RSI]; | |
847 | unsigned di = c->regs[VCPU_REGS_RDI]; | |
848 | ||
849 | /* 16-bit ModR/M decode. */ | |
850 | switch (c->modrm_mod) { | |
851 | case 0: | |
852 | if (c->modrm_rm == 6) | |
853 | c->modrm_ea += insn_fetch(u16, 2, c->eip); | |
854 | break; | |
855 | case 1: | |
856 | c->modrm_ea += insn_fetch(s8, 1, c->eip); | |
857 | break; | |
858 | case 2: | |
859 | c->modrm_ea += insn_fetch(u16, 2, c->eip); | |
860 | break; | |
861 | } | |
862 | switch (c->modrm_rm) { | |
863 | case 0: | |
864 | c->modrm_ea += bx + si; | |
865 | break; | |
866 | case 1: | |
867 | c->modrm_ea += bx + di; | |
868 | break; | |
869 | case 2: | |
870 | c->modrm_ea += bp + si; | |
871 | break; | |
872 | case 3: | |
873 | c->modrm_ea += bp + di; | |
874 | break; | |
875 | case 4: | |
876 | c->modrm_ea += si; | |
877 | break; | |
878 | case 5: | |
879 | c->modrm_ea += di; | |
880 | break; | |
881 | case 6: | |
882 | if (c->modrm_mod != 0) | |
883 | c->modrm_ea += bp; | |
884 | break; | |
885 | case 7: | |
886 | c->modrm_ea += bx; | |
887 | break; | |
888 | } | |
889 | if (c->modrm_rm == 2 || c->modrm_rm == 3 || | |
890 | (c->modrm_rm == 6 && c->modrm_mod != 0)) | |
7a5b56df AK |
891 | if (!c->has_seg_override) |
892 | set_seg_override(c, VCPU_SREG_SS); | |
1c73ef66 AK |
893 | c->modrm_ea = (u16)c->modrm_ea; |
894 | } else { | |
895 | /* 32/64-bit ModR/M decode. */ | |
84411d85 | 896 | if ((c->modrm_rm & 7) == 4) { |
1c73ef66 AK |
897 | sib = insn_fetch(u8, 1, c->eip); |
898 | index_reg |= (sib >> 3) & 7; | |
899 | base_reg |= sib & 7; | |
900 | scale = sib >> 6; | |
901 | ||
dc71d0f1 AK |
902 | if ((base_reg & 7) == 5 && c->modrm_mod == 0) |
903 | c->modrm_ea += insn_fetch(s32, 4, c->eip); | |
904 | else | |
1c73ef66 | 905 | c->modrm_ea += c->regs[base_reg]; |
dc71d0f1 | 906 | if (index_reg != 4) |
1c73ef66 | 907 | c->modrm_ea += c->regs[index_reg] << scale; |
84411d85 AK |
908 | } else if ((c->modrm_rm & 7) == 5 && c->modrm_mod == 0) { |
909 | if (ctxt->mode == X86EMUL_MODE_PROT64) | |
f5b4edcd | 910 | c->rip_relative = 1; |
84411d85 | 911 | } else |
1c73ef66 | 912 | c->modrm_ea += c->regs[c->modrm_rm]; |
1c73ef66 AK |
913 | switch (c->modrm_mod) { |
914 | case 0: | |
915 | if (c->modrm_rm == 5) | |
916 | c->modrm_ea += insn_fetch(s32, 4, c->eip); | |
917 | break; | |
918 | case 1: | |
919 | c->modrm_ea += insn_fetch(s8, 1, c->eip); | |
920 | break; | |
921 | case 2: | |
922 | c->modrm_ea += insn_fetch(s32, 4, c->eip); | |
923 | break; | |
924 | } | |
925 | } | |
1c73ef66 AK |
926 | done: |
927 | return rc; | |
928 | } | |
929 | ||
930 | static int decode_abs(struct x86_emulate_ctxt *ctxt, | |
931 | struct x86_emulate_ops *ops) | |
932 | { | |
933 | struct decode_cache *c = &ctxt->decode; | |
3e2815e9 | 934 | int rc = X86EMUL_CONTINUE; |
1c73ef66 AK |
935 | |
936 | switch (c->ad_bytes) { | |
937 | case 2: | |
938 | c->modrm_ea = insn_fetch(u16, 2, c->eip); | |
939 | break; | |
940 | case 4: | |
941 | c->modrm_ea = insn_fetch(u32, 4, c->eip); | |
942 | break; | |
943 | case 8: | |
944 | c->modrm_ea = insn_fetch(u64, 8, c->eip); | |
945 | break; | |
946 | } | |
947 | done: | |
948 | return rc; | |
949 | } | |
950 | ||
6aa8b732 | 951 | int |
8b4caf66 | 952 | x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) |
6aa8b732 | 953 | { |
e4e03ded | 954 | struct decode_cache *c = &ctxt->decode; |
3e2815e9 | 955 | int rc = X86EMUL_CONTINUE; |
6aa8b732 | 956 | int mode = ctxt->mode; |
e09d082c | 957 | int def_op_bytes, def_ad_bytes, group; |
6aa8b732 | 958 | |
6aa8b732 | 959 | |
5cd21917 GN |
960 | /* we cannot decode insn before we complete previous rep insn */ |
961 | WARN_ON(ctxt->restart); | |
962 | ||
063db061 | 963 | c->eip = ctxt->eip; |
2fb53ad8 | 964 | c->fetch.start = c->fetch.end = c->eip; |
79168fd1 | 965 | ctxt->cs_base = seg_base(ctxt, ops, VCPU_SREG_CS); |
6aa8b732 AK |
966 | |
967 | switch (mode) { | |
968 | case X86EMUL_MODE_REAL: | |
a0044755 | 969 | case X86EMUL_MODE_VM86: |
6aa8b732 | 970 | case X86EMUL_MODE_PROT16: |
f21b8bf4 | 971 | def_op_bytes = def_ad_bytes = 2; |
6aa8b732 AK |
972 | break; |
973 | case X86EMUL_MODE_PROT32: | |
f21b8bf4 | 974 | def_op_bytes = def_ad_bytes = 4; |
6aa8b732 | 975 | break; |
05b3e0c2 | 976 | #ifdef CONFIG_X86_64 |
6aa8b732 | 977 | case X86EMUL_MODE_PROT64: |
f21b8bf4 AK |
978 | def_op_bytes = 4; |
979 | def_ad_bytes = 8; | |
6aa8b732 AK |
980 | break; |
981 | #endif | |
982 | default: | |
983 | return -1; | |
984 | } | |
985 | ||
f21b8bf4 AK |
986 | c->op_bytes = def_op_bytes; |
987 | c->ad_bytes = def_ad_bytes; | |
988 | ||
6aa8b732 | 989 | /* Legacy prefixes. */ |
b4c6abfe | 990 | for (;;) { |
e4e03ded | 991 | switch (c->b = insn_fetch(u8, 1, c->eip)) { |
6aa8b732 | 992 | case 0x66: /* operand-size override */ |
f21b8bf4 AK |
993 | /* switch between 2/4 bytes */ |
994 | c->op_bytes = def_op_bytes ^ 6; | |
6aa8b732 AK |
995 | break; |
996 | case 0x67: /* address-size override */ | |
997 | if (mode == X86EMUL_MODE_PROT64) | |
e4e03ded | 998 | /* switch between 4/8 bytes */ |
f21b8bf4 | 999 | c->ad_bytes = def_ad_bytes ^ 12; |
6aa8b732 | 1000 | else |
e4e03ded | 1001 | /* switch between 2/4 bytes */ |
f21b8bf4 | 1002 | c->ad_bytes = def_ad_bytes ^ 6; |
6aa8b732 | 1003 | break; |
7a5b56df | 1004 | case 0x26: /* ES override */ |
6aa8b732 | 1005 | case 0x2e: /* CS override */ |
7a5b56df | 1006 | case 0x36: /* SS override */ |
6aa8b732 | 1007 | case 0x3e: /* DS override */ |
7a5b56df | 1008 | set_seg_override(c, (c->b >> 3) & 3); |
6aa8b732 AK |
1009 | break; |
1010 | case 0x64: /* FS override */ | |
6aa8b732 | 1011 | case 0x65: /* GS override */ |
7a5b56df | 1012 | set_seg_override(c, c->b & 7); |
6aa8b732 | 1013 | break; |
b4c6abfe LV |
1014 | case 0x40 ... 0x4f: /* REX */ |
1015 | if (mode != X86EMUL_MODE_PROT64) | |
1016 | goto done_prefixes; | |
33615aa9 | 1017 | c->rex_prefix = c->b; |
b4c6abfe | 1018 | continue; |
6aa8b732 | 1019 | case 0xf0: /* LOCK */ |
e4e03ded | 1020 | c->lock_prefix = 1; |
6aa8b732 | 1021 | break; |
ae6200ba | 1022 | case 0xf2: /* REPNE/REPNZ */ |
90e0a28f GT |
1023 | c->rep_prefix = REPNE_PREFIX; |
1024 | break; | |
6aa8b732 | 1025 | case 0xf3: /* REP/REPE/REPZ */ |
90e0a28f | 1026 | c->rep_prefix = REPE_PREFIX; |
6aa8b732 | 1027 | break; |
6aa8b732 AK |
1028 | default: |
1029 | goto done_prefixes; | |
1030 | } | |
b4c6abfe LV |
1031 | |
1032 | /* Any legacy prefix after a REX prefix nullifies its effect. */ | |
1033 | ||
33615aa9 | 1034 | c->rex_prefix = 0; |
6aa8b732 AK |
1035 | } |
1036 | ||
1037 | done_prefixes: | |
1038 | ||
1039 | /* REX prefix. */ | |
1c73ef66 | 1040 | if (c->rex_prefix) |
33615aa9 | 1041 | if (c->rex_prefix & 8) |
e4e03ded | 1042 | c->op_bytes = 8; /* REX.W */ |
6aa8b732 AK |
1043 | |
1044 | /* Opcode byte(s). */ | |
e4e03ded LV |
1045 | c->d = opcode_table[c->b]; |
1046 | if (c->d == 0) { | |
6aa8b732 | 1047 | /* Two-byte opcode? */ |
e4e03ded LV |
1048 | if (c->b == 0x0f) { |
1049 | c->twobyte = 1; | |
1050 | c->b = insn_fetch(u8, 1, c->eip); | |
1051 | c->d = twobyte_table[c->b]; | |
6aa8b732 | 1052 | } |
e09d082c | 1053 | } |
6aa8b732 | 1054 | |
e09d082c AK |
1055 | if (c->d & Group) { |
1056 | group = c->d & GroupMask; | |
1057 | c->modrm = insn_fetch(u8, 1, c->eip); | |
1058 | --c->eip; | |
1059 | ||
1060 | group = (group << 3) + ((c->modrm >> 3) & 7); | |
1061 | if ((c->d & GroupDual) && (c->modrm >> 6) == 3) | |
1062 | c->d = group2_table[group]; | |
1063 | else | |
1064 | c->d = group_table[group]; | |
1065 | } | |
1066 | ||
1067 | /* Unrecognised? */ | |
1068 | if (c->d == 0) { | |
1069 | DPRINTF("Cannot emulate %02x\n", c->b); | |
1070 | return -1; | |
6aa8b732 AK |
1071 | } |
1072 | ||
6e3d5dfb AK |
1073 | if (mode == X86EMUL_MODE_PROT64 && (c->d & Stack)) |
1074 | c->op_bytes = 8; | |
1075 | ||
6aa8b732 | 1076 | /* ModRM and SIB bytes. */ |
1c73ef66 AK |
1077 | if (c->d & ModRM) |
1078 | rc = decode_modrm(ctxt, ops); | |
1079 | else if (c->d & MemAbs) | |
1080 | rc = decode_abs(ctxt, ops); | |
3e2815e9 | 1081 | if (rc != X86EMUL_CONTINUE) |
1c73ef66 | 1082 | goto done; |
6aa8b732 | 1083 | |
7a5b56df AK |
1084 | if (!c->has_seg_override) |
1085 | set_seg_override(c, VCPU_SREG_DS); | |
c7e75a3d | 1086 | |
7a5b56df | 1087 | if (!(!c->twobyte && c->b == 0x8d)) |
79168fd1 | 1088 | c->modrm_ea += seg_override_base(ctxt, ops, c); |
c7e75a3d AK |
1089 | |
1090 | if (c->ad_bytes != 8) | |
1091 | c->modrm_ea = (u32)c->modrm_ea; | |
69f55cb1 GN |
1092 | |
1093 | if (c->rip_relative) | |
1094 | c->modrm_ea += c->eip; | |
1095 | ||
6aa8b732 AK |
1096 | /* |
1097 | * Decode and fetch the source operand: register, memory | |
1098 | * or immediate. | |
1099 | */ | |
e4e03ded | 1100 | switch (c->d & SrcMask) { |
6aa8b732 AK |
1101 | case SrcNone: |
1102 | break; | |
1103 | case SrcReg: | |
9f1ef3f8 | 1104 | decode_register_operand(&c->src, c, 0); |
6aa8b732 AK |
1105 | break; |
1106 | case SrcMem16: | |
e4e03ded | 1107 | c->src.bytes = 2; |
6aa8b732 AK |
1108 | goto srcmem_common; |
1109 | case SrcMem32: | |
e4e03ded | 1110 | c->src.bytes = 4; |
6aa8b732 AK |
1111 | goto srcmem_common; |
1112 | case SrcMem: | |
e4e03ded LV |
1113 | c->src.bytes = (c->d & ByteOp) ? 1 : |
1114 | c->op_bytes; | |
b85b9ee9 | 1115 | /* Don't fetch the address for invlpg: it could be unmapped. */ |
d77c26fc | 1116 | if (c->twobyte && c->b == 0x01 && c->modrm_reg == 7) |
b85b9ee9 | 1117 | break; |
d77c26fc | 1118 | srcmem_common: |
4e62417b AJ |
1119 | /* |
1120 | * For instructions with a ModR/M byte, switch to register | |
1121 | * access if Mod = 3. | |
1122 | */ | |
e4e03ded LV |
1123 | if ((c->d & ModRM) && c->modrm_mod == 3) { |
1124 | c->src.type = OP_REG; | |
66b85505 | 1125 | c->src.val = c->modrm_val; |
107d6d2e | 1126 | c->src.ptr = c->modrm_ptr; |
4e62417b AJ |
1127 | break; |
1128 | } | |
e4e03ded | 1129 | c->src.type = OP_MEM; |
69f55cb1 GN |
1130 | c->src.ptr = (unsigned long *)c->modrm_ea; |
1131 | c->src.val = 0; | |
6aa8b732 AK |
1132 | break; |
1133 | case SrcImm: | |
c9eaf20f | 1134 | case SrcImmU: |
e4e03ded LV |
1135 | c->src.type = OP_IMM; |
1136 | c->src.ptr = (unsigned long *)c->eip; | |
1137 | c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
1138 | if (c->src.bytes == 8) | |
1139 | c->src.bytes = 4; | |
6aa8b732 | 1140 | /* NB. Immediates are sign-extended as necessary. */ |
e4e03ded | 1141 | switch (c->src.bytes) { |
6aa8b732 | 1142 | case 1: |
e4e03ded | 1143 | c->src.val = insn_fetch(s8, 1, c->eip); |
6aa8b732 AK |
1144 | break; |
1145 | case 2: | |
e4e03ded | 1146 | c->src.val = insn_fetch(s16, 2, c->eip); |
6aa8b732 AK |
1147 | break; |
1148 | case 4: | |
e4e03ded | 1149 | c->src.val = insn_fetch(s32, 4, c->eip); |
6aa8b732 AK |
1150 | break; |
1151 | } | |
c9eaf20f AK |
1152 | if ((c->d & SrcMask) == SrcImmU) { |
1153 | switch (c->src.bytes) { | |
1154 | case 1: | |
1155 | c->src.val &= 0xff; | |
1156 | break; | |
1157 | case 2: | |
1158 | c->src.val &= 0xffff; | |
1159 | break; | |
1160 | case 4: | |
1161 | c->src.val &= 0xffffffff; | |
1162 | break; | |
1163 | } | |
1164 | } | |
6aa8b732 AK |
1165 | break; |
1166 | case SrcImmByte: | |
341de7e3 | 1167 | case SrcImmUByte: |
e4e03ded LV |
1168 | c->src.type = OP_IMM; |
1169 | c->src.ptr = (unsigned long *)c->eip; | |
1170 | c->src.bytes = 1; | |
341de7e3 GN |
1171 | if ((c->d & SrcMask) == SrcImmByte) |
1172 | c->src.val = insn_fetch(s8, 1, c->eip); | |
1173 | else | |
1174 | c->src.val = insn_fetch(u8, 1, c->eip); | |
6aa8b732 | 1175 | break; |
5d55f299 WY |
1176 | case SrcAcc: |
1177 | c->src.type = OP_REG; | |
1178 | c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
1179 | c->src.ptr = &c->regs[VCPU_REGS_RAX]; | |
1180 | switch (c->src.bytes) { | |
1181 | case 1: | |
1182 | c->src.val = *(u8 *)c->src.ptr; | |
1183 | break; | |
1184 | case 2: | |
1185 | c->src.val = *(u16 *)c->src.ptr; | |
1186 | break; | |
1187 | case 4: | |
1188 | c->src.val = *(u32 *)c->src.ptr; | |
1189 | break; | |
1190 | case 8: | |
1191 | c->src.val = *(u64 *)c->src.ptr; | |
1192 | break; | |
1193 | } | |
1194 | break; | |
bfcadf83 GT |
1195 | case SrcOne: |
1196 | c->src.bytes = 1; | |
1197 | c->src.val = 1; | |
1198 | break; | |
a682e354 GN |
1199 | case SrcSI: |
1200 | c->src.type = OP_MEM; | |
1201 | c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
1202 | c->src.ptr = (unsigned long *) | |
79168fd1 | 1203 | register_address(c, seg_override_base(ctxt, ops, c), |
a682e354 GN |
1204 | c->regs[VCPU_REGS_RSI]); |
1205 | c->src.val = 0; | |
1206 | break; | |
414e6277 GN |
1207 | case SrcImmFAddr: |
1208 | c->src.type = OP_IMM; | |
1209 | c->src.ptr = (unsigned long *)c->eip; | |
1210 | c->src.bytes = c->op_bytes + 2; | |
1211 | insn_fetch_arr(c->src.valptr, c->src.bytes, c->eip); | |
1212 | break; | |
1213 | case SrcMemFAddr: | |
1214 | c->src.type = OP_MEM; | |
1215 | c->src.ptr = (unsigned long *)c->modrm_ea; | |
1216 | c->src.bytes = c->op_bytes + 2; | |
1217 | break; | |
6aa8b732 AK |
1218 | } |
1219 | ||
0dc8d10f GT |
1220 | /* |
1221 | * Decode and fetch the second source operand: register, memory | |
1222 | * or immediate. | |
1223 | */ | |
1224 | switch (c->d & Src2Mask) { | |
1225 | case Src2None: | |
1226 | break; | |
1227 | case Src2CL: | |
1228 | c->src2.bytes = 1; | |
1229 | c->src2.val = c->regs[VCPU_REGS_RCX] & 0x8; | |
1230 | break; | |
1231 | case Src2ImmByte: | |
1232 | c->src2.type = OP_IMM; | |
1233 | c->src2.ptr = (unsigned long *)c->eip; | |
1234 | c->src2.bytes = 1; | |
1235 | c->src2.val = insn_fetch(u8, 1, c->eip); | |
1236 | break; | |
1237 | case Src2One: | |
1238 | c->src2.bytes = 1; | |
1239 | c->src2.val = 1; | |
1240 | break; | |
1241 | } | |
1242 | ||
038e51de | 1243 | /* Decode and fetch the destination operand: register or memory. */ |
e4e03ded | 1244 | switch (c->d & DstMask) { |
038e51de AK |
1245 | case ImplicitOps: |
1246 | /* Special instructions do their own operand decoding. */ | |
8b4caf66 | 1247 | return 0; |
038e51de | 1248 | case DstReg: |
9f1ef3f8 | 1249 | decode_register_operand(&c->dst, c, |
3c118e24 | 1250 | c->twobyte && (c->b == 0xb6 || c->b == 0xb7)); |
038e51de AK |
1251 | break; |
1252 | case DstMem: | |
6550e1f1 | 1253 | case DstMem64: |
e4e03ded | 1254 | if ((c->d & ModRM) && c->modrm_mod == 3) { |
89c69638 | 1255 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; |
e4e03ded | 1256 | c->dst.type = OP_REG; |
66b85505 | 1257 | c->dst.val = c->dst.orig_val = c->modrm_val; |
107d6d2e | 1258 | c->dst.ptr = c->modrm_ptr; |
4e62417b AJ |
1259 | break; |
1260 | } | |
8b4caf66 | 1261 | c->dst.type = OP_MEM; |
69f55cb1 | 1262 | c->dst.ptr = (unsigned long *)c->modrm_ea; |
6550e1f1 GN |
1263 | if ((c->d & DstMask) == DstMem64) |
1264 | c->dst.bytes = 8; | |
1265 | else | |
1266 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
69f55cb1 GN |
1267 | c->dst.val = 0; |
1268 | if (c->d & BitOp) { | |
1269 | unsigned long mask = ~(c->dst.bytes * 8 - 1); | |
1270 | ||
1271 | c->dst.ptr = (void *)c->dst.ptr + | |
1272 | (c->src.val & mask) / 8; | |
1273 | } | |
8b4caf66 | 1274 | break; |
9c9fddd0 GT |
1275 | case DstAcc: |
1276 | c->dst.type = OP_REG; | |
d6d367d6 | 1277 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; |
9c9fddd0 | 1278 | c->dst.ptr = &c->regs[VCPU_REGS_RAX]; |
d6d367d6 | 1279 | switch (c->dst.bytes) { |
9c9fddd0 GT |
1280 | case 1: |
1281 | c->dst.val = *(u8 *)c->dst.ptr; | |
1282 | break; | |
1283 | case 2: | |
1284 | c->dst.val = *(u16 *)c->dst.ptr; | |
1285 | break; | |
1286 | case 4: | |
1287 | c->dst.val = *(u32 *)c->dst.ptr; | |
1288 | break; | |
d6d367d6 GN |
1289 | case 8: |
1290 | c->dst.val = *(u64 *)c->dst.ptr; | |
1291 | break; | |
9c9fddd0 GT |
1292 | } |
1293 | c->dst.orig_val = c->dst.val; | |
1294 | break; | |
a682e354 GN |
1295 | case DstDI: |
1296 | c->dst.type = OP_MEM; | |
1297 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
1298 | c->dst.ptr = (unsigned long *) | |
79168fd1 | 1299 | register_address(c, es_base(ctxt, ops), |
a682e354 GN |
1300 | c->regs[VCPU_REGS_RDI]); |
1301 | c->dst.val = 0; | |
1302 | break; | |
8b4caf66 LV |
1303 | } |
1304 | ||
1305 | done: | |
1306 | return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0; | |
1307 | } | |
1308 | ||
9de41573 GN |
1309 | static int read_emulated(struct x86_emulate_ctxt *ctxt, |
1310 | struct x86_emulate_ops *ops, | |
1311 | unsigned long addr, void *dest, unsigned size) | |
1312 | { | |
1313 | int rc; | |
1314 | struct read_cache *mc = &ctxt->decode.mem_read; | |
8fe681e9 | 1315 | u32 err; |
9de41573 GN |
1316 | |
1317 | while (size) { | |
1318 | int n = min(size, 8u); | |
1319 | size -= n; | |
1320 | if (mc->pos < mc->end) | |
1321 | goto read_cached; | |
1322 | ||
8fe681e9 GN |
1323 | rc = ops->read_emulated(addr, mc->data + mc->end, n, &err, |
1324 | ctxt->vcpu); | |
1325 | if (rc == X86EMUL_PROPAGATE_FAULT) | |
54b8486f | 1326 | emulate_pf(ctxt, addr, err); |
9de41573 GN |
1327 | if (rc != X86EMUL_CONTINUE) |
1328 | return rc; | |
1329 | mc->end += n; | |
1330 | ||
1331 | read_cached: | |
1332 | memcpy(dest, mc->data + mc->pos, n); | |
1333 | mc->pos += n; | |
1334 | dest += n; | |
1335 | addr += n; | |
1336 | } | |
1337 | return X86EMUL_CONTINUE; | |
1338 | } | |
1339 | ||
7b262e90 GN |
1340 | static int pio_in_emulated(struct x86_emulate_ctxt *ctxt, |
1341 | struct x86_emulate_ops *ops, | |
1342 | unsigned int size, unsigned short port, | |
1343 | void *dest) | |
1344 | { | |
1345 | struct read_cache *rc = &ctxt->decode.io_read; | |
1346 | ||
1347 | if (rc->pos == rc->end) { /* refill pio read ahead */ | |
1348 | struct decode_cache *c = &ctxt->decode; | |
1349 | unsigned int in_page, n; | |
1350 | unsigned int count = c->rep_prefix ? | |
1351 | address_mask(c, c->regs[VCPU_REGS_RCX]) : 1; | |
1352 | in_page = (ctxt->eflags & EFLG_DF) ? | |
1353 | offset_in_page(c->regs[VCPU_REGS_RDI]) : | |
1354 | PAGE_SIZE - offset_in_page(c->regs[VCPU_REGS_RDI]); | |
1355 | n = min(min(in_page, (unsigned int)sizeof(rc->data)) / size, | |
1356 | count); | |
1357 | if (n == 0) | |
1358 | n = 1; | |
1359 | rc->pos = rc->end = 0; | |
1360 | if (!ops->pio_in_emulated(size, port, rc->data, n, ctxt->vcpu)) | |
1361 | return 0; | |
1362 | rc->end = n * size; | |
1363 | } | |
1364 | ||
1365 | memcpy(dest, rc->data + rc->pos, size); | |
1366 | rc->pos += size; | |
1367 | return 1; | |
1368 | } | |
1369 | ||
38ba30ba GN |
1370 | static u32 desc_limit_scaled(struct desc_struct *desc) |
1371 | { | |
1372 | u32 limit = get_desc_limit(desc); | |
1373 | ||
1374 | return desc->g ? (limit << 12) | 0xfff : limit; | |
1375 | } | |
1376 | ||
1377 | static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt, | |
1378 | struct x86_emulate_ops *ops, | |
1379 | u16 selector, struct desc_ptr *dt) | |
1380 | { | |
1381 | if (selector & 1 << 2) { | |
1382 | struct desc_struct desc; | |
1383 | memset (dt, 0, sizeof *dt); | |
1384 | if (!ops->get_cached_descriptor(&desc, VCPU_SREG_LDTR, ctxt->vcpu)) | |
1385 | return; | |
1386 | ||
1387 | dt->size = desc_limit_scaled(&desc); /* what if limit > 65535? */ | |
1388 | dt->address = get_desc_base(&desc); | |
1389 | } else | |
1390 | ops->get_gdt(dt, ctxt->vcpu); | |
1391 | } | |
1392 | ||
1393 | /* allowed just for 8 bytes segments */ | |
1394 | static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt, | |
1395 | struct x86_emulate_ops *ops, | |
1396 | u16 selector, struct desc_struct *desc) | |
1397 | { | |
1398 | struct desc_ptr dt; | |
1399 | u16 index = selector >> 3; | |
1400 | int ret; | |
1401 | u32 err; | |
1402 | ulong addr; | |
1403 | ||
1404 | get_descriptor_table_ptr(ctxt, ops, selector, &dt); | |
1405 | ||
1406 | if (dt.size < index * 8 + 7) { | |
54b8486f | 1407 | emulate_gp(ctxt, selector & 0xfffc); |
38ba30ba GN |
1408 | return X86EMUL_PROPAGATE_FAULT; |
1409 | } | |
1410 | addr = dt.address + index * 8; | |
1411 | ret = ops->read_std(addr, desc, sizeof *desc, ctxt->vcpu, &err); | |
1412 | if (ret == X86EMUL_PROPAGATE_FAULT) | |
54b8486f | 1413 | emulate_pf(ctxt, addr, err); |
38ba30ba GN |
1414 | |
1415 | return ret; | |
1416 | } | |
1417 | ||
1418 | /* allowed just for 8 bytes segments */ | |
1419 | static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt, | |
1420 | struct x86_emulate_ops *ops, | |
1421 | u16 selector, struct desc_struct *desc) | |
1422 | { | |
1423 | struct desc_ptr dt; | |
1424 | u16 index = selector >> 3; | |
1425 | u32 err; | |
1426 | ulong addr; | |
1427 | int ret; | |
1428 | ||
1429 | get_descriptor_table_ptr(ctxt, ops, selector, &dt); | |
1430 | ||
1431 | if (dt.size < index * 8 + 7) { | |
54b8486f | 1432 | emulate_gp(ctxt, selector & 0xfffc); |
38ba30ba GN |
1433 | return X86EMUL_PROPAGATE_FAULT; |
1434 | } | |
1435 | ||
1436 | addr = dt.address + index * 8; | |
1437 | ret = ops->write_std(addr, desc, sizeof *desc, ctxt->vcpu, &err); | |
1438 | if (ret == X86EMUL_PROPAGATE_FAULT) | |
54b8486f | 1439 | emulate_pf(ctxt, addr, err); |
38ba30ba GN |
1440 | |
1441 | return ret; | |
1442 | } | |
1443 | ||
1444 | static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt, | |
1445 | struct x86_emulate_ops *ops, | |
1446 | u16 selector, int seg) | |
1447 | { | |
1448 | struct desc_struct seg_desc; | |
1449 | u8 dpl, rpl, cpl; | |
1450 | unsigned err_vec = GP_VECTOR; | |
1451 | u32 err_code = 0; | |
1452 | bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */ | |
1453 | int ret; | |
1454 | ||
1455 | memset(&seg_desc, 0, sizeof seg_desc); | |
1456 | ||
1457 | if ((seg <= VCPU_SREG_GS && ctxt->mode == X86EMUL_MODE_VM86) | |
1458 | || ctxt->mode == X86EMUL_MODE_REAL) { | |
1459 | /* set real mode segment descriptor */ | |
1460 | set_desc_base(&seg_desc, selector << 4); | |
1461 | set_desc_limit(&seg_desc, 0xffff); | |
1462 | seg_desc.type = 3; | |
1463 | seg_desc.p = 1; | |
1464 | seg_desc.s = 1; | |
1465 | goto load; | |
1466 | } | |
1467 | ||
1468 | /* NULL selector is not valid for TR, CS and SS */ | |
1469 | if ((seg == VCPU_SREG_CS || seg == VCPU_SREG_SS || seg == VCPU_SREG_TR) | |
1470 | && null_selector) | |
1471 | goto exception; | |
1472 | ||
1473 | /* TR should be in GDT only */ | |
1474 | if (seg == VCPU_SREG_TR && (selector & (1 << 2))) | |
1475 | goto exception; | |
1476 | ||
1477 | if (null_selector) /* for NULL selector skip all following checks */ | |
1478 | goto load; | |
1479 | ||
1480 | ret = read_segment_descriptor(ctxt, ops, selector, &seg_desc); | |
1481 | if (ret != X86EMUL_CONTINUE) | |
1482 | return ret; | |
1483 | ||
1484 | err_code = selector & 0xfffc; | |
1485 | err_vec = GP_VECTOR; | |
1486 | ||
1487 | /* can't load system descriptor into segment selecor */ | |
1488 | if (seg <= VCPU_SREG_GS && !seg_desc.s) | |
1489 | goto exception; | |
1490 | ||
1491 | if (!seg_desc.p) { | |
1492 | err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR; | |
1493 | goto exception; | |
1494 | } | |
1495 | ||
1496 | rpl = selector & 3; | |
1497 | dpl = seg_desc.dpl; | |
1498 | cpl = ops->cpl(ctxt->vcpu); | |
1499 | ||
1500 | switch (seg) { | |
1501 | case VCPU_SREG_SS: | |
1502 | /* | |
1503 | * segment is not a writable data segment or segment | |
1504 | * selector's RPL != CPL or segment selector's RPL != CPL | |
1505 | */ | |
1506 | if (rpl != cpl || (seg_desc.type & 0xa) != 0x2 || dpl != cpl) | |
1507 | goto exception; | |
1508 | break; | |
1509 | case VCPU_SREG_CS: | |
1510 | if (!(seg_desc.type & 8)) | |
1511 | goto exception; | |
1512 | ||
1513 | if (seg_desc.type & 4) { | |
1514 | /* conforming */ | |
1515 | if (dpl > cpl) | |
1516 | goto exception; | |
1517 | } else { | |
1518 | /* nonconforming */ | |
1519 | if (rpl > cpl || dpl != cpl) | |
1520 | goto exception; | |
1521 | } | |
1522 | /* CS(RPL) <- CPL */ | |
1523 | selector = (selector & 0xfffc) | cpl; | |
1524 | break; | |
1525 | case VCPU_SREG_TR: | |
1526 | if (seg_desc.s || (seg_desc.type != 1 && seg_desc.type != 9)) | |
1527 | goto exception; | |
1528 | break; | |
1529 | case VCPU_SREG_LDTR: | |
1530 | if (seg_desc.s || seg_desc.type != 2) | |
1531 | goto exception; | |
1532 | break; | |
1533 | default: /* DS, ES, FS, or GS */ | |
1534 | /* | |
1535 | * segment is not a data or readable code segment or | |
1536 | * ((segment is a data or nonconforming code segment) | |
1537 | * and (both RPL and CPL > DPL)) | |
1538 | */ | |
1539 | if ((seg_desc.type & 0xa) == 0x8 || | |
1540 | (((seg_desc.type & 0xc) != 0xc) && | |
1541 | (rpl > dpl && cpl > dpl))) | |
1542 | goto exception; | |
1543 | break; | |
1544 | } | |
1545 | ||
1546 | if (seg_desc.s) { | |
1547 | /* mark segment as accessed */ | |
1548 | seg_desc.type |= 1; | |
1549 | ret = write_segment_descriptor(ctxt, ops, selector, &seg_desc); | |
1550 | if (ret != X86EMUL_CONTINUE) | |
1551 | return ret; | |
1552 | } | |
1553 | load: | |
1554 | ops->set_segment_selector(selector, seg, ctxt->vcpu); | |
1555 | ops->set_cached_descriptor(&seg_desc, seg, ctxt->vcpu); | |
1556 | return X86EMUL_CONTINUE; | |
1557 | exception: | |
54b8486f | 1558 | emulate_exception(ctxt, err_vec, err_code, true); |
38ba30ba GN |
1559 | return X86EMUL_PROPAGATE_FAULT; |
1560 | } | |
1561 | ||
c37eda13 WY |
1562 | static inline int writeback(struct x86_emulate_ctxt *ctxt, |
1563 | struct x86_emulate_ops *ops) | |
1564 | { | |
1565 | int rc; | |
1566 | struct decode_cache *c = &ctxt->decode; | |
1567 | u32 err; | |
1568 | ||
1569 | switch (c->dst.type) { | |
1570 | case OP_REG: | |
1571 | /* The 4-byte case *is* correct: | |
1572 | * in 64-bit mode we zero-extend. | |
1573 | */ | |
1574 | switch (c->dst.bytes) { | |
1575 | case 1: | |
1576 | *(u8 *)c->dst.ptr = (u8)c->dst.val; | |
1577 | break; | |
1578 | case 2: | |
1579 | *(u16 *)c->dst.ptr = (u16)c->dst.val; | |
1580 | break; | |
1581 | case 4: | |
1582 | *c->dst.ptr = (u32)c->dst.val; | |
1583 | break; /* 64b: zero-ext */ | |
1584 | case 8: | |
1585 | *c->dst.ptr = c->dst.val; | |
1586 | break; | |
1587 | } | |
1588 | break; | |
1589 | case OP_MEM: | |
1590 | if (c->lock_prefix) | |
1591 | rc = ops->cmpxchg_emulated( | |
1592 | (unsigned long)c->dst.ptr, | |
1593 | &c->dst.orig_val, | |
1594 | &c->dst.val, | |
1595 | c->dst.bytes, | |
1596 | &err, | |
1597 | ctxt->vcpu); | |
1598 | else | |
1599 | rc = ops->write_emulated( | |
1600 | (unsigned long)c->dst.ptr, | |
1601 | &c->dst.val, | |
1602 | c->dst.bytes, | |
1603 | &err, | |
1604 | ctxt->vcpu); | |
1605 | if (rc == X86EMUL_PROPAGATE_FAULT) | |
1606 | emulate_pf(ctxt, | |
1607 | (unsigned long)c->dst.ptr, err); | |
1608 | if (rc != X86EMUL_CONTINUE) | |
1609 | return rc; | |
1610 | break; | |
1611 | case OP_NONE: | |
1612 | /* no writeback */ | |
1613 | break; | |
1614 | default: | |
1615 | break; | |
1616 | } | |
1617 | return X86EMUL_CONTINUE; | |
1618 | } | |
1619 | ||
79168fd1 GN |
1620 | static inline void emulate_push(struct x86_emulate_ctxt *ctxt, |
1621 | struct x86_emulate_ops *ops) | |
8cdbd2c9 LV |
1622 | { |
1623 | struct decode_cache *c = &ctxt->decode; | |
1624 | ||
1625 | c->dst.type = OP_MEM; | |
1626 | c->dst.bytes = c->op_bytes; | |
1627 | c->dst.val = c->src.val; | |
7a957275 | 1628 | register_address_increment(c, &c->regs[VCPU_REGS_RSP], -c->op_bytes); |
79168fd1 | 1629 | c->dst.ptr = (void *) register_address(c, ss_base(ctxt, ops), |
8cdbd2c9 LV |
1630 | c->regs[VCPU_REGS_RSP]); |
1631 | } | |
1632 | ||
faa5a3ae | 1633 | static int emulate_pop(struct x86_emulate_ctxt *ctxt, |
350f69dc AK |
1634 | struct x86_emulate_ops *ops, |
1635 | void *dest, int len) | |
8cdbd2c9 LV |
1636 | { |
1637 | struct decode_cache *c = &ctxt->decode; | |
1638 | int rc; | |
1639 | ||
79168fd1 | 1640 | rc = read_emulated(ctxt, ops, register_address(c, ss_base(ctxt, ops), |
9de41573 GN |
1641 | c->regs[VCPU_REGS_RSP]), |
1642 | dest, len); | |
b60d513c | 1643 | if (rc != X86EMUL_CONTINUE) |
8cdbd2c9 LV |
1644 | return rc; |
1645 | ||
350f69dc | 1646 | register_address_increment(c, &c->regs[VCPU_REGS_RSP], len); |
faa5a3ae AK |
1647 | return rc; |
1648 | } | |
8cdbd2c9 | 1649 | |
d4c6a154 GN |
1650 | static int emulate_popf(struct x86_emulate_ctxt *ctxt, |
1651 | struct x86_emulate_ops *ops, | |
1652 | void *dest, int len) | |
1653 | { | |
1654 | int rc; | |
1655 | unsigned long val, change_mask; | |
1656 | int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT; | |
9c537244 | 1657 | int cpl = ops->cpl(ctxt->vcpu); |
d4c6a154 GN |
1658 | |
1659 | rc = emulate_pop(ctxt, ops, &val, len); | |
1660 | if (rc != X86EMUL_CONTINUE) | |
1661 | return rc; | |
1662 | ||
1663 | change_mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_OF | |
1664 | | EFLG_TF | EFLG_DF | EFLG_NT | EFLG_RF | EFLG_AC | EFLG_ID; | |
1665 | ||
1666 | switch(ctxt->mode) { | |
1667 | case X86EMUL_MODE_PROT64: | |
1668 | case X86EMUL_MODE_PROT32: | |
1669 | case X86EMUL_MODE_PROT16: | |
1670 | if (cpl == 0) | |
1671 | change_mask |= EFLG_IOPL; | |
1672 | if (cpl <= iopl) | |
1673 | change_mask |= EFLG_IF; | |
1674 | break; | |
1675 | case X86EMUL_MODE_VM86: | |
1676 | if (iopl < 3) { | |
54b8486f | 1677 | emulate_gp(ctxt, 0); |
d4c6a154 GN |
1678 | return X86EMUL_PROPAGATE_FAULT; |
1679 | } | |
1680 | change_mask |= EFLG_IF; | |
1681 | break; | |
1682 | default: /* real mode */ | |
1683 | change_mask |= (EFLG_IOPL | EFLG_IF); | |
1684 | break; | |
1685 | } | |
1686 | ||
1687 | *(unsigned long *)dest = | |
1688 | (ctxt->eflags & ~change_mask) | (val & change_mask); | |
1689 | ||
1690 | return rc; | |
1691 | } | |
1692 | ||
79168fd1 GN |
1693 | static void emulate_push_sreg(struct x86_emulate_ctxt *ctxt, |
1694 | struct x86_emulate_ops *ops, int seg) | |
0934ac9d MG |
1695 | { |
1696 | struct decode_cache *c = &ctxt->decode; | |
0934ac9d | 1697 | |
79168fd1 | 1698 | c->src.val = ops->get_segment_selector(seg, ctxt->vcpu); |
0934ac9d | 1699 | |
79168fd1 | 1700 | emulate_push(ctxt, ops); |
0934ac9d MG |
1701 | } |
1702 | ||
1703 | static int emulate_pop_sreg(struct x86_emulate_ctxt *ctxt, | |
1704 | struct x86_emulate_ops *ops, int seg) | |
1705 | { | |
1706 | struct decode_cache *c = &ctxt->decode; | |
1707 | unsigned long selector; | |
1708 | int rc; | |
1709 | ||
1710 | rc = emulate_pop(ctxt, ops, &selector, c->op_bytes); | |
1b30eaa8 | 1711 | if (rc != X86EMUL_CONTINUE) |
0934ac9d MG |
1712 | return rc; |
1713 | ||
2e873022 | 1714 | rc = load_segment_descriptor(ctxt, ops, (u16)selector, seg); |
0934ac9d MG |
1715 | return rc; |
1716 | } | |
1717 | ||
c37eda13 | 1718 | static int emulate_pusha(struct x86_emulate_ctxt *ctxt, |
79168fd1 | 1719 | struct x86_emulate_ops *ops) |
abcf14b5 MG |
1720 | { |
1721 | struct decode_cache *c = &ctxt->decode; | |
1722 | unsigned long old_esp = c->regs[VCPU_REGS_RSP]; | |
c37eda13 | 1723 | int rc = X86EMUL_CONTINUE; |
abcf14b5 MG |
1724 | int reg = VCPU_REGS_RAX; |
1725 | ||
1726 | while (reg <= VCPU_REGS_RDI) { | |
1727 | (reg == VCPU_REGS_RSP) ? | |
1728 | (c->src.val = old_esp) : (c->src.val = c->regs[reg]); | |
1729 | ||
79168fd1 | 1730 | emulate_push(ctxt, ops); |
c37eda13 WY |
1731 | |
1732 | rc = writeback(ctxt, ops); | |
1733 | if (rc != X86EMUL_CONTINUE) | |
1734 | return rc; | |
1735 | ||
abcf14b5 MG |
1736 | ++reg; |
1737 | } | |
c37eda13 WY |
1738 | |
1739 | /* Disable writeback. */ | |
1740 | c->dst.type = OP_NONE; | |
1741 | ||
1742 | return rc; | |
abcf14b5 MG |
1743 | } |
1744 | ||
1745 | static int emulate_popa(struct x86_emulate_ctxt *ctxt, | |
1746 | struct x86_emulate_ops *ops) | |
1747 | { | |
1748 | struct decode_cache *c = &ctxt->decode; | |
1b30eaa8 | 1749 | int rc = X86EMUL_CONTINUE; |
abcf14b5 MG |
1750 | int reg = VCPU_REGS_RDI; |
1751 | ||
1752 | while (reg >= VCPU_REGS_RAX) { | |
1753 | if (reg == VCPU_REGS_RSP) { | |
1754 | register_address_increment(c, &c->regs[VCPU_REGS_RSP], | |
1755 | c->op_bytes); | |
1756 | --reg; | |
1757 | } | |
1758 | ||
1759 | rc = emulate_pop(ctxt, ops, &c->regs[reg], c->op_bytes); | |
1b30eaa8 | 1760 | if (rc != X86EMUL_CONTINUE) |
abcf14b5 MG |
1761 | break; |
1762 | --reg; | |
1763 | } | |
1764 | return rc; | |
1765 | } | |
1766 | ||
faa5a3ae AK |
1767 | static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt, |
1768 | struct x86_emulate_ops *ops) | |
1769 | { | |
1770 | struct decode_cache *c = &ctxt->decode; | |
faa5a3ae | 1771 | |
1b30eaa8 | 1772 | return emulate_pop(ctxt, ops, &c->dst.val, c->dst.bytes); |
8cdbd2c9 LV |
1773 | } |
1774 | ||
05f086f8 | 1775 | static inline void emulate_grp2(struct x86_emulate_ctxt *ctxt) |
8cdbd2c9 | 1776 | { |
05f086f8 | 1777 | struct decode_cache *c = &ctxt->decode; |
8cdbd2c9 LV |
1778 | switch (c->modrm_reg) { |
1779 | case 0: /* rol */ | |
05f086f8 | 1780 | emulate_2op_SrcB("rol", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1781 | break; |
1782 | case 1: /* ror */ | |
05f086f8 | 1783 | emulate_2op_SrcB("ror", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1784 | break; |
1785 | case 2: /* rcl */ | |
05f086f8 | 1786 | emulate_2op_SrcB("rcl", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1787 | break; |
1788 | case 3: /* rcr */ | |
05f086f8 | 1789 | emulate_2op_SrcB("rcr", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1790 | break; |
1791 | case 4: /* sal/shl */ | |
1792 | case 6: /* sal/shl */ | |
05f086f8 | 1793 | emulate_2op_SrcB("sal", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1794 | break; |
1795 | case 5: /* shr */ | |
05f086f8 | 1796 | emulate_2op_SrcB("shr", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1797 | break; |
1798 | case 7: /* sar */ | |
05f086f8 | 1799 | emulate_2op_SrcB("sar", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1800 | break; |
1801 | } | |
1802 | } | |
1803 | ||
1804 | static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt, | |
05f086f8 | 1805 | struct x86_emulate_ops *ops) |
8cdbd2c9 LV |
1806 | { |
1807 | struct decode_cache *c = &ctxt->decode; | |
8cdbd2c9 LV |
1808 | |
1809 | switch (c->modrm_reg) { | |
1810 | case 0 ... 1: /* test */ | |
05f086f8 | 1811 | emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1812 | break; |
1813 | case 2: /* not */ | |
1814 | c->dst.val = ~c->dst.val; | |
1815 | break; | |
1816 | case 3: /* neg */ | |
05f086f8 | 1817 | emulate_1op("neg", c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1818 | break; |
1819 | default: | |
aca06a83 | 1820 | return 0; |
8cdbd2c9 | 1821 | } |
aca06a83 | 1822 | return 1; |
8cdbd2c9 LV |
1823 | } |
1824 | ||
1825 | static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt, | |
a01af5ec | 1826 | struct x86_emulate_ops *ops) |
8cdbd2c9 LV |
1827 | { |
1828 | struct decode_cache *c = &ctxt->decode; | |
8cdbd2c9 LV |
1829 | |
1830 | switch (c->modrm_reg) { | |
1831 | case 0: /* inc */ | |
05f086f8 | 1832 | emulate_1op("inc", c->dst, ctxt->eflags); |
8cdbd2c9 LV |
1833 | break; |
1834 | case 1: /* dec */ | |
05f086f8 | 1835 | emulate_1op("dec", c->dst, ctxt->eflags); |
8cdbd2c9 | 1836 | break; |
d19292e4 MG |
1837 | case 2: /* call near abs */ { |
1838 | long int old_eip; | |
1839 | old_eip = c->eip; | |
1840 | c->eip = c->src.val; | |
1841 | c->src.val = old_eip; | |
79168fd1 | 1842 | emulate_push(ctxt, ops); |
d19292e4 MG |
1843 | break; |
1844 | } | |
8cdbd2c9 | 1845 | case 4: /* jmp abs */ |
fd60754e | 1846 | c->eip = c->src.val; |
8cdbd2c9 LV |
1847 | break; |
1848 | case 6: /* push */ | |
79168fd1 | 1849 | emulate_push(ctxt, ops); |
8cdbd2c9 | 1850 | break; |
8cdbd2c9 | 1851 | } |
1b30eaa8 | 1852 | return X86EMUL_CONTINUE; |
8cdbd2c9 LV |
1853 | } |
1854 | ||
1855 | static inline int emulate_grp9(struct x86_emulate_ctxt *ctxt, | |
69f55cb1 | 1856 | struct x86_emulate_ops *ops) |
8cdbd2c9 LV |
1857 | { |
1858 | struct decode_cache *c = &ctxt->decode; | |
16518d5a | 1859 | u64 old = c->dst.orig_val64; |
8cdbd2c9 LV |
1860 | |
1861 | if (((u32) (old >> 0) != (u32) c->regs[VCPU_REGS_RAX]) || | |
1862 | ((u32) (old >> 32) != (u32) c->regs[VCPU_REGS_RDX])) { | |
8cdbd2c9 LV |
1863 | c->regs[VCPU_REGS_RAX] = (u32) (old >> 0); |
1864 | c->regs[VCPU_REGS_RDX] = (u32) (old >> 32); | |
05f086f8 | 1865 | ctxt->eflags &= ~EFLG_ZF; |
8cdbd2c9 | 1866 | } else { |
16518d5a AK |
1867 | c->dst.val64 = ((u64)c->regs[VCPU_REGS_RCX] << 32) | |
1868 | (u32) c->regs[VCPU_REGS_RBX]; | |
8cdbd2c9 | 1869 | |
05f086f8 | 1870 | ctxt->eflags |= EFLG_ZF; |
8cdbd2c9 | 1871 | } |
1b30eaa8 | 1872 | return X86EMUL_CONTINUE; |
8cdbd2c9 LV |
1873 | } |
1874 | ||
a77ab5ea AK |
1875 | static int emulate_ret_far(struct x86_emulate_ctxt *ctxt, |
1876 | struct x86_emulate_ops *ops) | |
1877 | { | |
1878 | struct decode_cache *c = &ctxt->decode; | |
1879 | int rc; | |
1880 | unsigned long cs; | |
1881 | ||
1882 | rc = emulate_pop(ctxt, ops, &c->eip, c->op_bytes); | |
1b30eaa8 | 1883 | if (rc != X86EMUL_CONTINUE) |
a77ab5ea AK |
1884 | return rc; |
1885 | if (c->op_bytes == 4) | |
1886 | c->eip = (u32)c->eip; | |
1887 | rc = emulate_pop(ctxt, ops, &cs, c->op_bytes); | |
1b30eaa8 | 1888 | if (rc != X86EMUL_CONTINUE) |
a77ab5ea | 1889 | return rc; |
2e873022 | 1890 | rc = load_segment_descriptor(ctxt, ops, (u16)cs, VCPU_SREG_CS); |
a77ab5ea AK |
1891 | return rc; |
1892 | } | |
1893 | ||
e66bb2cc AP |
1894 | static inline void |
1895 | setup_syscalls_segments(struct x86_emulate_ctxt *ctxt, | |
79168fd1 GN |
1896 | struct x86_emulate_ops *ops, struct desc_struct *cs, |
1897 | struct desc_struct *ss) | |
e66bb2cc | 1898 | { |
79168fd1 GN |
1899 | memset(cs, 0, sizeof(struct desc_struct)); |
1900 | ops->get_cached_descriptor(cs, VCPU_SREG_CS, ctxt->vcpu); | |
1901 | memset(ss, 0, sizeof(struct desc_struct)); | |
e66bb2cc AP |
1902 | |
1903 | cs->l = 0; /* will be adjusted later */ | |
79168fd1 | 1904 | set_desc_base(cs, 0); /* flat segment */ |
e66bb2cc | 1905 | cs->g = 1; /* 4kb granularity */ |
79168fd1 | 1906 | set_desc_limit(cs, 0xfffff); /* 4GB limit */ |
e66bb2cc AP |
1907 | cs->type = 0x0b; /* Read, Execute, Accessed */ |
1908 | cs->s = 1; | |
1909 | cs->dpl = 0; /* will be adjusted later */ | |
79168fd1 GN |
1910 | cs->p = 1; |
1911 | cs->d = 1; | |
e66bb2cc | 1912 | |
79168fd1 GN |
1913 | set_desc_base(ss, 0); /* flat segment */ |
1914 | set_desc_limit(ss, 0xfffff); /* 4GB limit */ | |
e66bb2cc AP |
1915 | ss->g = 1; /* 4kb granularity */ |
1916 | ss->s = 1; | |
1917 | ss->type = 0x03; /* Read/Write, Accessed */ | |
79168fd1 | 1918 | ss->d = 1; /* 32bit stack segment */ |
e66bb2cc | 1919 | ss->dpl = 0; |
79168fd1 | 1920 | ss->p = 1; |
e66bb2cc AP |
1921 | } |
1922 | ||
1923 | static int | |
3fb1b5db | 1924 | emulate_syscall(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) |
e66bb2cc AP |
1925 | { |
1926 | struct decode_cache *c = &ctxt->decode; | |
79168fd1 | 1927 | struct desc_struct cs, ss; |
e66bb2cc | 1928 | u64 msr_data; |
79168fd1 | 1929 | u16 cs_sel, ss_sel; |
e66bb2cc AP |
1930 | |
1931 | /* syscall is not available in real mode */ | |
2e901c4c GN |
1932 | if (ctxt->mode == X86EMUL_MODE_REAL || |
1933 | ctxt->mode == X86EMUL_MODE_VM86) { | |
54b8486f | 1934 | emulate_ud(ctxt); |
2e901c4c GN |
1935 | return X86EMUL_PROPAGATE_FAULT; |
1936 | } | |
e66bb2cc | 1937 | |
79168fd1 | 1938 | setup_syscalls_segments(ctxt, ops, &cs, &ss); |
e66bb2cc | 1939 | |
3fb1b5db | 1940 | ops->get_msr(ctxt->vcpu, MSR_STAR, &msr_data); |
e66bb2cc | 1941 | msr_data >>= 32; |
79168fd1 GN |
1942 | cs_sel = (u16)(msr_data & 0xfffc); |
1943 | ss_sel = (u16)(msr_data + 8); | |
e66bb2cc AP |
1944 | |
1945 | if (is_long_mode(ctxt->vcpu)) { | |
79168fd1 | 1946 | cs.d = 0; |
e66bb2cc AP |
1947 | cs.l = 1; |
1948 | } | |
79168fd1 GN |
1949 | ops->set_cached_descriptor(&cs, VCPU_SREG_CS, ctxt->vcpu); |
1950 | ops->set_segment_selector(cs_sel, VCPU_SREG_CS, ctxt->vcpu); | |
1951 | ops->set_cached_descriptor(&ss, VCPU_SREG_SS, ctxt->vcpu); | |
1952 | ops->set_segment_selector(ss_sel, VCPU_SREG_SS, ctxt->vcpu); | |
e66bb2cc AP |
1953 | |
1954 | c->regs[VCPU_REGS_RCX] = c->eip; | |
1955 | if (is_long_mode(ctxt->vcpu)) { | |
1956 | #ifdef CONFIG_X86_64 | |
1957 | c->regs[VCPU_REGS_R11] = ctxt->eflags & ~EFLG_RF; | |
1958 | ||
3fb1b5db GN |
1959 | ops->get_msr(ctxt->vcpu, |
1960 | ctxt->mode == X86EMUL_MODE_PROT64 ? | |
1961 | MSR_LSTAR : MSR_CSTAR, &msr_data); | |
e66bb2cc AP |
1962 | c->eip = msr_data; |
1963 | ||
3fb1b5db | 1964 | ops->get_msr(ctxt->vcpu, MSR_SYSCALL_MASK, &msr_data); |
e66bb2cc AP |
1965 | ctxt->eflags &= ~(msr_data | EFLG_RF); |
1966 | #endif | |
1967 | } else { | |
1968 | /* legacy mode */ | |
3fb1b5db | 1969 | ops->get_msr(ctxt->vcpu, MSR_STAR, &msr_data); |
e66bb2cc AP |
1970 | c->eip = (u32)msr_data; |
1971 | ||
1972 | ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF); | |
1973 | } | |
1974 | ||
e54cfa97 | 1975 | return X86EMUL_CONTINUE; |
e66bb2cc AP |
1976 | } |
1977 | ||
8c604352 | 1978 | static int |
3fb1b5db | 1979 | emulate_sysenter(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) |
8c604352 AP |
1980 | { |
1981 | struct decode_cache *c = &ctxt->decode; | |
79168fd1 | 1982 | struct desc_struct cs, ss; |
8c604352 | 1983 | u64 msr_data; |
79168fd1 | 1984 | u16 cs_sel, ss_sel; |
8c604352 | 1985 | |
a0044755 GN |
1986 | /* inject #GP if in real mode */ |
1987 | if (ctxt->mode == X86EMUL_MODE_REAL) { | |
54b8486f | 1988 | emulate_gp(ctxt, 0); |
2e901c4c | 1989 | return X86EMUL_PROPAGATE_FAULT; |
8c604352 AP |
1990 | } |
1991 | ||
1992 | /* XXX sysenter/sysexit have not been tested in 64bit mode. | |
1993 | * Therefore, we inject an #UD. | |
1994 | */ | |
2e901c4c | 1995 | if (ctxt->mode == X86EMUL_MODE_PROT64) { |
54b8486f | 1996 | emulate_ud(ctxt); |
2e901c4c GN |
1997 | return X86EMUL_PROPAGATE_FAULT; |
1998 | } | |
8c604352 | 1999 | |
79168fd1 | 2000 | setup_syscalls_segments(ctxt, ops, &cs, &ss); |
8c604352 | 2001 | |
3fb1b5db | 2002 | ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_CS, &msr_data); |
8c604352 AP |
2003 | switch (ctxt->mode) { |
2004 | case X86EMUL_MODE_PROT32: | |
2005 | if ((msr_data & 0xfffc) == 0x0) { | |
54b8486f | 2006 | emulate_gp(ctxt, 0); |
e54cfa97 | 2007 | return X86EMUL_PROPAGATE_FAULT; |
8c604352 AP |
2008 | } |
2009 | break; | |
2010 | case X86EMUL_MODE_PROT64: | |
2011 | if (msr_data == 0x0) { | |
54b8486f | 2012 | emulate_gp(ctxt, 0); |
e54cfa97 | 2013 | return X86EMUL_PROPAGATE_FAULT; |
8c604352 AP |
2014 | } |
2015 | break; | |
2016 | } | |
2017 | ||
2018 | ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF); | |
79168fd1 GN |
2019 | cs_sel = (u16)msr_data; |
2020 | cs_sel &= ~SELECTOR_RPL_MASK; | |
2021 | ss_sel = cs_sel + 8; | |
2022 | ss_sel &= ~SELECTOR_RPL_MASK; | |
8c604352 AP |
2023 | if (ctxt->mode == X86EMUL_MODE_PROT64 |
2024 | || is_long_mode(ctxt->vcpu)) { | |
79168fd1 | 2025 | cs.d = 0; |
8c604352 AP |
2026 | cs.l = 1; |
2027 | } | |
2028 | ||
79168fd1 GN |
2029 | ops->set_cached_descriptor(&cs, VCPU_SREG_CS, ctxt->vcpu); |
2030 | ops->set_segment_selector(cs_sel, VCPU_SREG_CS, ctxt->vcpu); | |
2031 | ops->set_cached_descriptor(&ss, VCPU_SREG_SS, ctxt->vcpu); | |
2032 | ops->set_segment_selector(ss_sel, VCPU_SREG_SS, ctxt->vcpu); | |
8c604352 | 2033 | |
3fb1b5db | 2034 | ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_EIP, &msr_data); |
8c604352 AP |
2035 | c->eip = msr_data; |
2036 | ||
3fb1b5db | 2037 | ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_ESP, &msr_data); |
8c604352 AP |
2038 | c->regs[VCPU_REGS_RSP] = msr_data; |
2039 | ||
e54cfa97 | 2040 | return X86EMUL_CONTINUE; |
8c604352 AP |
2041 | } |
2042 | ||
4668f050 | 2043 | static int |
3fb1b5db | 2044 | emulate_sysexit(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) |
4668f050 AP |
2045 | { |
2046 | struct decode_cache *c = &ctxt->decode; | |
79168fd1 | 2047 | struct desc_struct cs, ss; |
4668f050 AP |
2048 | u64 msr_data; |
2049 | int usermode; | |
79168fd1 | 2050 | u16 cs_sel, ss_sel; |
4668f050 | 2051 | |
a0044755 GN |
2052 | /* inject #GP if in real mode or Virtual 8086 mode */ |
2053 | if (ctxt->mode == X86EMUL_MODE_REAL || | |
2054 | ctxt->mode == X86EMUL_MODE_VM86) { | |
54b8486f | 2055 | emulate_gp(ctxt, 0); |
2e901c4c | 2056 | return X86EMUL_PROPAGATE_FAULT; |
4668f050 AP |
2057 | } |
2058 | ||
79168fd1 | 2059 | setup_syscalls_segments(ctxt, ops, &cs, &ss); |
4668f050 AP |
2060 | |
2061 | if ((c->rex_prefix & 0x8) != 0x0) | |
2062 | usermode = X86EMUL_MODE_PROT64; | |
2063 | else | |
2064 | usermode = X86EMUL_MODE_PROT32; | |
2065 | ||
2066 | cs.dpl = 3; | |
2067 | ss.dpl = 3; | |
3fb1b5db | 2068 | ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_CS, &msr_data); |
4668f050 AP |
2069 | switch (usermode) { |
2070 | case X86EMUL_MODE_PROT32: | |
79168fd1 | 2071 | cs_sel = (u16)(msr_data + 16); |
4668f050 | 2072 | if ((msr_data & 0xfffc) == 0x0) { |
54b8486f | 2073 | emulate_gp(ctxt, 0); |
e54cfa97 | 2074 | return X86EMUL_PROPAGATE_FAULT; |
4668f050 | 2075 | } |
79168fd1 | 2076 | ss_sel = (u16)(msr_data + 24); |
4668f050 AP |
2077 | break; |
2078 | case X86EMUL_MODE_PROT64: | |
79168fd1 | 2079 | cs_sel = (u16)(msr_data + 32); |
4668f050 | 2080 | if (msr_data == 0x0) { |
54b8486f | 2081 | emulate_gp(ctxt, 0); |
e54cfa97 | 2082 | return X86EMUL_PROPAGATE_FAULT; |
4668f050 | 2083 | } |
79168fd1 GN |
2084 | ss_sel = cs_sel + 8; |
2085 | cs.d = 0; | |
4668f050 AP |
2086 | cs.l = 1; |
2087 | break; | |
2088 | } | |
79168fd1 GN |
2089 | cs_sel |= SELECTOR_RPL_MASK; |
2090 | ss_sel |= SELECTOR_RPL_MASK; | |
4668f050 | 2091 | |
79168fd1 GN |
2092 | ops->set_cached_descriptor(&cs, VCPU_SREG_CS, ctxt->vcpu); |
2093 | ops->set_segment_selector(cs_sel, VCPU_SREG_CS, ctxt->vcpu); | |
2094 | ops->set_cached_descriptor(&ss, VCPU_SREG_SS, ctxt->vcpu); | |
2095 | ops->set_segment_selector(ss_sel, VCPU_SREG_SS, ctxt->vcpu); | |
4668f050 | 2096 | |
bdb475a3 GN |
2097 | c->eip = c->regs[VCPU_REGS_RDX]; |
2098 | c->regs[VCPU_REGS_RSP] = c->regs[VCPU_REGS_RCX]; | |
4668f050 | 2099 | |
e54cfa97 | 2100 | return X86EMUL_CONTINUE; |
4668f050 AP |
2101 | } |
2102 | ||
9c537244 GN |
2103 | static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt, |
2104 | struct x86_emulate_ops *ops) | |
f850e2e6 GN |
2105 | { |
2106 | int iopl; | |
2107 | if (ctxt->mode == X86EMUL_MODE_REAL) | |
2108 | return false; | |
2109 | if (ctxt->mode == X86EMUL_MODE_VM86) | |
2110 | return true; | |
2111 | iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT; | |
9c537244 | 2112 | return ops->cpl(ctxt->vcpu) > iopl; |
f850e2e6 GN |
2113 | } |
2114 | ||
2115 | static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt, | |
2116 | struct x86_emulate_ops *ops, | |
2117 | u16 port, u16 len) | |
2118 | { | |
79168fd1 | 2119 | struct desc_struct tr_seg; |
f850e2e6 GN |
2120 | int r; |
2121 | u16 io_bitmap_ptr; | |
2122 | u8 perm, bit_idx = port & 0x7; | |
2123 | unsigned mask = (1 << len) - 1; | |
2124 | ||
79168fd1 GN |
2125 | ops->get_cached_descriptor(&tr_seg, VCPU_SREG_TR, ctxt->vcpu); |
2126 | if (!tr_seg.p) | |
f850e2e6 | 2127 | return false; |
79168fd1 | 2128 | if (desc_limit_scaled(&tr_seg) < 103) |
f850e2e6 | 2129 | return false; |
79168fd1 GN |
2130 | r = ops->read_std(get_desc_base(&tr_seg) + 102, &io_bitmap_ptr, 2, |
2131 | ctxt->vcpu, NULL); | |
f850e2e6 GN |
2132 | if (r != X86EMUL_CONTINUE) |
2133 | return false; | |
79168fd1 | 2134 | if (io_bitmap_ptr + port/8 > desc_limit_scaled(&tr_seg)) |
f850e2e6 | 2135 | return false; |
79168fd1 GN |
2136 | r = ops->read_std(get_desc_base(&tr_seg) + io_bitmap_ptr + port/8, |
2137 | &perm, 1, ctxt->vcpu, NULL); | |
f850e2e6 GN |
2138 | if (r != X86EMUL_CONTINUE) |
2139 | return false; | |
2140 | if ((perm >> bit_idx) & mask) | |
2141 | return false; | |
2142 | return true; | |
2143 | } | |
2144 | ||
2145 | static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt, | |
2146 | struct x86_emulate_ops *ops, | |
2147 | u16 port, u16 len) | |
2148 | { | |
9c537244 | 2149 | if (emulator_bad_iopl(ctxt, ops)) |
f850e2e6 GN |
2150 | if (!emulator_io_port_access_allowed(ctxt, ops, port, len)) |
2151 | return false; | |
2152 | return true; | |
2153 | } | |
2154 | ||
38ba30ba GN |
2155 | static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt, |
2156 | struct x86_emulate_ops *ops, | |
2157 | struct tss_segment_16 *tss) | |
2158 | { | |
2159 | struct decode_cache *c = &ctxt->decode; | |
2160 | ||
2161 | tss->ip = c->eip; | |
2162 | tss->flag = ctxt->eflags; | |
2163 | tss->ax = c->regs[VCPU_REGS_RAX]; | |
2164 | tss->cx = c->regs[VCPU_REGS_RCX]; | |
2165 | tss->dx = c->regs[VCPU_REGS_RDX]; | |
2166 | tss->bx = c->regs[VCPU_REGS_RBX]; | |
2167 | tss->sp = c->regs[VCPU_REGS_RSP]; | |
2168 | tss->bp = c->regs[VCPU_REGS_RBP]; | |
2169 | tss->si = c->regs[VCPU_REGS_RSI]; | |
2170 | tss->di = c->regs[VCPU_REGS_RDI]; | |
2171 | ||
2172 | tss->es = ops->get_segment_selector(VCPU_SREG_ES, ctxt->vcpu); | |
2173 | tss->cs = ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu); | |
2174 | tss->ss = ops->get_segment_selector(VCPU_SREG_SS, ctxt->vcpu); | |
2175 | tss->ds = ops->get_segment_selector(VCPU_SREG_DS, ctxt->vcpu); | |
2176 | tss->ldt = ops->get_segment_selector(VCPU_SREG_LDTR, ctxt->vcpu); | |
2177 | } | |
2178 | ||
2179 | static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt, | |
2180 | struct x86_emulate_ops *ops, | |
2181 | struct tss_segment_16 *tss) | |
2182 | { | |
2183 | struct decode_cache *c = &ctxt->decode; | |
2184 | int ret; | |
2185 | ||
2186 | c->eip = tss->ip; | |
2187 | ctxt->eflags = tss->flag | 2; | |
2188 | c->regs[VCPU_REGS_RAX] = tss->ax; | |
2189 | c->regs[VCPU_REGS_RCX] = tss->cx; | |
2190 | c->regs[VCPU_REGS_RDX] = tss->dx; | |
2191 | c->regs[VCPU_REGS_RBX] = tss->bx; | |
2192 | c->regs[VCPU_REGS_RSP] = tss->sp; | |
2193 | c->regs[VCPU_REGS_RBP] = tss->bp; | |
2194 | c->regs[VCPU_REGS_RSI] = tss->si; | |
2195 | c->regs[VCPU_REGS_RDI] = tss->di; | |
2196 | ||
2197 | /* | |
2198 | * SDM says that segment selectors are loaded before segment | |
2199 | * descriptors | |
2200 | */ | |
2201 | ops->set_segment_selector(tss->ldt, VCPU_SREG_LDTR, ctxt->vcpu); | |
2202 | ops->set_segment_selector(tss->es, VCPU_SREG_ES, ctxt->vcpu); | |
2203 | ops->set_segment_selector(tss->cs, VCPU_SREG_CS, ctxt->vcpu); | |
2204 | ops->set_segment_selector(tss->ss, VCPU_SREG_SS, ctxt->vcpu); | |
2205 | ops->set_segment_selector(tss->ds, VCPU_SREG_DS, ctxt->vcpu); | |
2206 | ||
2207 | /* | |
2208 | * Now load segment descriptors. If fault happenes at this stage | |
2209 | * it is handled in a context of new task | |
2210 | */ | |
2211 | ret = load_segment_descriptor(ctxt, ops, tss->ldt, VCPU_SREG_LDTR); | |
2212 | if (ret != X86EMUL_CONTINUE) | |
2213 | return ret; | |
2214 | ret = load_segment_descriptor(ctxt, ops, tss->es, VCPU_SREG_ES); | |
2215 | if (ret != X86EMUL_CONTINUE) | |
2216 | return ret; | |
2217 | ret = load_segment_descriptor(ctxt, ops, tss->cs, VCPU_SREG_CS); | |
2218 | if (ret != X86EMUL_CONTINUE) | |
2219 | return ret; | |
2220 | ret = load_segment_descriptor(ctxt, ops, tss->ss, VCPU_SREG_SS); | |
2221 | if (ret != X86EMUL_CONTINUE) | |
2222 | return ret; | |
2223 | ret = load_segment_descriptor(ctxt, ops, tss->ds, VCPU_SREG_DS); | |
2224 | if (ret != X86EMUL_CONTINUE) | |
2225 | return ret; | |
2226 | ||
2227 | return X86EMUL_CONTINUE; | |
2228 | } | |
2229 | ||
2230 | static int task_switch_16(struct x86_emulate_ctxt *ctxt, | |
2231 | struct x86_emulate_ops *ops, | |
2232 | u16 tss_selector, u16 old_tss_sel, | |
2233 | ulong old_tss_base, struct desc_struct *new_desc) | |
2234 | { | |
2235 | struct tss_segment_16 tss_seg; | |
2236 | int ret; | |
2237 | u32 err, new_tss_base = get_desc_base(new_desc); | |
2238 | ||
2239 | ret = ops->read_std(old_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu, | |
2240 | &err); | |
2241 | if (ret == X86EMUL_PROPAGATE_FAULT) { | |
2242 | /* FIXME: need to provide precise fault address */ | |
54b8486f | 2243 | emulate_pf(ctxt, old_tss_base, err); |
38ba30ba GN |
2244 | return ret; |
2245 | } | |
2246 | ||
2247 | save_state_to_tss16(ctxt, ops, &tss_seg); | |
2248 | ||
2249 | ret = ops->write_std(old_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu, | |
2250 | &err); | |
2251 | if (ret == X86EMUL_PROPAGATE_FAULT) { | |
2252 | /* FIXME: need to provide precise fault address */ | |
54b8486f | 2253 | emulate_pf(ctxt, old_tss_base, err); |
38ba30ba GN |
2254 | return ret; |
2255 | } | |
2256 | ||
2257 | ret = ops->read_std(new_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu, | |
2258 | &err); | |
2259 | if (ret == X86EMUL_PROPAGATE_FAULT) { | |
2260 | /* FIXME: need to provide precise fault address */ | |
54b8486f | 2261 | emulate_pf(ctxt, new_tss_base, err); |
38ba30ba GN |
2262 | return ret; |
2263 | } | |
2264 | ||
2265 | if (old_tss_sel != 0xffff) { | |
2266 | tss_seg.prev_task_link = old_tss_sel; | |
2267 | ||
2268 | ret = ops->write_std(new_tss_base, | |
2269 | &tss_seg.prev_task_link, | |
2270 | sizeof tss_seg.prev_task_link, | |
2271 | ctxt->vcpu, &err); | |
2272 | if (ret == X86EMUL_PROPAGATE_FAULT) { | |
2273 | /* FIXME: need to provide precise fault address */ | |
54b8486f | 2274 | emulate_pf(ctxt, new_tss_base, err); |
38ba30ba GN |
2275 | return ret; |
2276 | } | |
2277 | } | |
2278 | ||
2279 | return load_state_from_tss16(ctxt, ops, &tss_seg); | |
2280 | } | |
2281 | ||
2282 | static void save_state_to_tss32(struct x86_emulate_ctxt *ctxt, | |
2283 | struct x86_emulate_ops *ops, | |
2284 | struct tss_segment_32 *tss) | |
2285 | { | |
2286 | struct decode_cache *c = &ctxt->decode; | |
2287 | ||
2288 | tss->cr3 = ops->get_cr(3, ctxt->vcpu); | |
2289 | tss->eip = c->eip; | |
2290 | tss->eflags = ctxt->eflags; | |
2291 | tss->eax = c->regs[VCPU_REGS_RAX]; | |
2292 | tss->ecx = c->regs[VCPU_REGS_RCX]; | |
2293 | tss->edx = c->regs[VCPU_REGS_RDX]; | |
2294 | tss->ebx = c->regs[VCPU_REGS_RBX]; | |
2295 | tss->esp = c->regs[VCPU_REGS_RSP]; | |
2296 | tss->ebp = c->regs[VCPU_REGS_RBP]; | |
2297 | tss->esi = c->regs[VCPU_REGS_RSI]; | |
2298 | tss->edi = c->regs[VCPU_REGS_RDI]; | |
2299 | ||
2300 | tss->es = ops->get_segment_selector(VCPU_SREG_ES, ctxt->vcpu); | |
2301 | tss->cs = ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu); | |
2302 | tss->ss = ops->get_segment_selector(VCPU_SREG_SS, ctxt->vcpu); | |
2303 | tss->ds = ops->get_segment_selector(VCPU_SREG_DS, ctxt->vcpu); | |
2304 | tss->fs = ops->get_segment_selector(VCPU_SREG_FS, ctxt->vcpu); | |
2305 | tss->gs = ops->get_segment_selector(VCPU_SREG_GS, ctxt->vcpu); | |
2306 | tss->ldt_selector = ops->get_segment_selector(VCPU_SREG_LDTR, ctxt->vcpu); | |
2307 | } | |
2308 | ||
2309 | static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt, | |
2310 | struct x86_emulate_ops *ops, | |
2311 | struct tss_segment_32 *tss) | |
2312 | { | |
2313 | struct decode_cache *c = &ctxt->decode; | |
2314 | int ret; | |
2315 | ||
0f12244f | 2316 | if (ops->set_cr(3, tss->cr3, ctxt->vcpu)) { |
54b8486f | 2317 | emulate_gp(ctxt, 0); |
0f12244f GN |
2318 | return X86EMUL_PROPAGATE_FAULT; |
2319 | } | |
38ba30ba GN |
2320 | c->eip = tss->eip; |
2321 | ctxt->eflags = tss->eflags | 2; | |
2322 | c->regs[VCPU_REGS_RAX] = tss->eax; | |
2323 | c->regs[VCPU_REGS_RCX] = tss->ecx; | |
2324 | c->regs[VCPU_REGS_RDX] = tss->edx; | |
2325 | c->regs[VCPU_REGS_RBX] = tss->ebx; | |
2326 | c->regs[VCPU_REGS_RSP] = tss->esp; | |
2327 | c->regs[VCPU_REGS_RBP] = tss->ebp; | |
2328 | c->regs[VCPU_REGS_RSI] = tss->esi; | |
2329 | c->regs[VCPU_REGS_RDI] = tss->edi; | |
2330 | ||
2331 | /* | |
2332 | * SDM says that segment selectors are loaded before segment | |
2333 | * descriptors | |
2334 | */ | |
2335 | ops->set_segment_selector(tss->ldt_selector, VCPU_SREG_LDTR, ctxt->vcpu); | |
2336 | ops->set_segment_selector(tss->es, VCPU_SREG_ES, ctxt->vcpu); | |
2337 | ops->set_segment_selector(tss->cs, VCPU_SREG_CS, ctxt->vcpu); | |
2338 | ops->set_segment_selector(tss->ss, VCPU_SREG_SS, ctxt->vcpu); | |
2339 | ops->set_segment_selector(tss->ds, VCPU_SREG_DS, ctxt->vcpu); | |
2340 | ops->set_segment_selector(tss->fs, VCPU_SREG_FS, ctxt->vcpu); | |
2341 | ops->set_segment_selector(tss->gs, VCPU_SREG_GS, ctxt->vcpu); | |
2342 | ||
2343 | /* | |
2344 | * Now load segment descriptors. If fault happenes at this stage | |
2345 | * it is handled in a context of new task | |
2346 | */ | |
2347 | ret = load_segment_descriptor(ctxt, ops, tss->ldt_selector, VCPU_SREG_LDTR); | |
2348 | if (ret != X86EMUL_CONTINUE) | |
2349 | return ret; | |
2350 | ret = load_segment_descriptor(ctxt, ops, tss->es, VCPU_SREG_ES); | |
2351 | if (ret != X86EMUL_CONTINUE) | |
2352 | return ret; | |
2353 | ret = load_segment_descriptor(ctxt, ops, tss->cs, VCPU_SREG_CS); | |
2354 | if (ret != X86EMUL_CONTINUE) | |
2355 | return ret; | |
2356 | ret = load_segment_descriptor(ctxt, ops, tss->ss, VCPU_SREG_SS); | |
2357 | if (ret != X86EMUL_CONTINUE) | |
2358 | return ret; | |
2359 | ret = load_segment_descriptor(ctxt, ops, tss->ds, VCPU_SREG_DS); | |
2360 | if (ret != X86EMUL_CONTINUE) | |
2361 | return ret; | |
2362 | ret = load_segment_descriptor(ctxt, ops, tss->fs, VCPU_SREG_FS); | |
2363 | if (ret != X86EMUL_CONTINUE) | |
2364 | return ret; | |
2365 | ret = load_segment_descriptor(ctxt, ops, tss->gs, VCPU_SREG_GS); | |
2366 | if (ret != X86EMUL_CONTINUE) | |
2367 | return ret; | |
2368 | ||
2369 | return X86EMUL_CONTINUE; | |
2370 | } | |
2371 | ||
2372 | static int task_switch_32(struct x86_emulate_ctxt *ctxt, | |
2373 | struct x86_emulate_ops *ops, | |
2374 | u16 tss_selector, u16 old_tss_sel, | |
2375 | ulong old_tss_base, struct desc_struct *new_desc) | |
2376 | { | |
2377 | struct tss_segment_32 tss_seg; | |
2378 | int ret; | |
2379 | u32 err, new_tss_base = get_desc_base(new_desc); | |
2380 | ||
2381 | ret = ops->read_std(old_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu, | |
2382 | &err); | |
2383 | if (ret == X86EMUL_PROPAGATE_FAULT) { | |
2384 | /* FIXME: need to provide precise fault address */ | |
54b8486f | 2385 | emulate_pf(ctxt, old_tss_base, err); |
38ba30ba GN |
2386 | return ret; |
2387 | } | |
2388 | ||
2389 | save_state_to_tss32(ctxt, ops, &tss_seg); | |
2390 | ||
2391 | ret = ops->write_std(old_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu, | |
2392 | &err); | |
2393 | if (ret == X86EMUL_PROPAGATE_FAULT) { | |
2394 | /* FIXME: need to provide precise fault address */ | |
54b8486f | 2395 | emulate_pf(ctxt, old_tss_base, err); |
38ba30ba GN |
2396 | return ret; |
2397 | } | |
2398 | ||
2399 | ret = ops->read_std(new_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu, | |
2400 | &err); | |
2401 | if (ret == X86EMUL_PROPAGATE_FAULT) { | |
2402 | /* FIXME: need to provide precise fault address */ | |
54b8486f | 2403 | emulate_pf(ctxt, new_tss_base, err); |
38ba30ba GN |
2404 | return ret; |
2405 | } | |
2406 | ||
2407 | if (old_tss_sel != 0xffff) { | |
2408 | tss_seg.prev_task_link = old_tss_sel; | |
2409 | ||
2410 | ret = ops->write_std(new_tss_base, | |
2411 | &tss_seg.prev_task_link, | |
2412 | sizeof tss_seg.prev_task_link, | |
2413 | ctxt->vcpu, &err); | |
2414 | if (ret == X86EMUL_PROPAGATE_FAULT) { | |
2415 | /* FIXME: need to provide precise fault address */ | |
54b8486f | 2416 | emulate_pf(ctxt, new_tss_base, err); |
38ba30ba GN |
2417 | return ret; |
2418 | } | |
2419 | } | |
2420 | ||
2421 | return load_state_from_tss32(ctxt, ops, &tss_seg); | |
2422 | } | |
2423 | ||
2424 | static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, | |
e269fb21 JK |
2425 | struct x86_emulate_ops *ops, |
2426 | u16 tss_selector, int reason, | |
2427 | bool has_error_code, u32 error_code) | |
38ba30ba GN |
2428 | { |
2429 | struct desc_struct curr_tss_desc, next_tss_desc; | |
2430 | int ret; | |
2431 | u16 old_tss_sel = ops->get_segment_selector(VCPU_SREG_TR, ctxt->vcpu); | |
2432 | ulong old_tss_base = | |
5951c442 | 2433 | ops->get_cached_segment_base(VCPU_SREG_TR, ctxt->vcpu); |
ceffb459 | 2434 | u32 desc_limit; |
38ba30ba GN |
2435 | |
2436 | /* FIXME: old_tss_base == ~0 ? */ | |
2437 | ||
2438 | ret = read_segment_descriptor(ctxt, ops, tss_selector, &next_tss_desc); | |
2439 | if (ret != X86EMUL_CONTINUE) | |
2440 | return ret; | |
2441 | ret = read_segment_descriptor(ctxt, ops, old_tss_sel, &curr_tss_desc); | |
2442 | if (ret != X86EMUL_CONTINUE) | |
2443 | return ret; | |
2444 | ||
2445 | /* FIXME: check that next_tss_desc is tss */ | |
2446 | ||
2447 | if (reason != TASK_SWITCH_IRET) { | |
2448 | if ((tss_selector & 3) > next_tss_desc.dpl || | |
2449 | ops->cpl(ctxt->vcpu) > next_tss_desc.dpl) { | |
54b8486f | 2450 | emulate_gp(ctxt, 0); |
38ba30ba GN |
2451 | return X86EMUL_PROPAGATE_FAULT; |
2452 | } | |
2453 | } | |
2454 | ||
ceffb459 GN |
2455 | desc_limit = desc_limit_scaled(&next_tss_desc); |
2456 | if (!next_tss_desc.p || | |
2457 | ((desc_limit < 0x67 && (next_tss_desc.type & 8)) || | |
2458 | desc_limit < 0x2b)) { | |
54b8486f | 2459 | emulate_ts(ctxt, tss_selector & 0xfffc); |
38ba30ba GN |
2460 | return X86EMUL_PROPAGATE_FAULT; |
2461 | } | |
2462 | ||
2463 | if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) { | |
2464 | curr_tss_desc.type &= ~(1 << 1); /* clear busy flag */ | |
2465 | write_segment_descriptor(ctxt, ops, old_tss_sel, | |
2466 | &curr_tss_desc); | |
2467 | } | |
2468 | ||
2469 | if (reason == TASK_SWITCH_IRET) | |
2470 | ctxt->eflags = ctxt->eflags & ~X86_EFLAGS_NT; | |
2471 | ||
2472 | /* set back link to prev task only if NT bit is set in eflags | |
2473 | note that old_tss_sel is not used afetr this point */ | |
2474 | if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE) | |
2475 | old_tss_sel = 0xffff; | |
2476 | ||
2477 | if (next_tss_desc.type & 8) | |
2478 | ret = task_switch_32(ctxt, ops, tss_selector, old_tss_sel, | |
2479 | old_tss_base, &next_tss_desc); | |
2480 | else | |
2481 | ret = task_switch_16(ctxt, ops, tss_selector, old_tss_sel, | |
2482 | old_tss_base, &next_tss_desc); | |
0760d448 JK |
2483 | if (ret != X86EMUL_CONTINUE) |
2484 | return ret; | |
38ba30ba GN |
2485 | |
2486 | if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) | |
2487 | ctxt->eflags = ctxt->eflags | X86_EFLAGS_NT; | |
2488 | ||
2489 | if (reason != TASK_SWITCH_IRET) { | |
2490 | next_tss_desc.type |= (1 << 1); /* set busy flag */ | |
2491 | write_segment_descriptor(ctxt, ops, tss_selector, | |
2492 | &next_tss_desc); | |
2493 | } | |
2494 | ||
2495 | ops->set_cr(0, ops->get_cr(0, ctxt->vcpu) | X86_CR0_TS, ctxt->vcpu); | |
2496 | ops->set_cached_descriptor(&next_tss_desc, VCPU_SREG_TR, ctxt->vcpu); | |
2497 | ops->set_segment_selector(tss_selector, VCPU_SREG_TR, ctxt->vcpu); | |
2498 | ||
e269fb21 JK |
2499 | if (has_error_code) { |
2500 | struct decode_cache *c = &ctxt->decode; | |
2501 | ||
2502 | c->op_bytes = c->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2; | |
2503 | c->lock_prefix = 0; | |
2504 | c->src.val = (unsigned long) error_code; | |
79168fd1 | 2505 | emulate_push(ctxt, ops); |
e269fb21 JK |
2506 | } |
2507 | ||
38ba30ba GN |
2508 | return ret; |
2509 | } | |
2510 | ||
2511 | int emulator_task_switch(struct x86_emulate_ctxt *ctxt, | |
2512 | struct x86_emulate_ops *ops, | |
e269fb21 JK |
2513 | u16 tss_selector, int reason, |
2514 | bool has_error_code, u32 error_code) | |
38ba30ba GN |
2515 | { |
2516 | struct decode_cache *c = &ctxt->decode; | |
2517 | int rc; | |
2518 | ||
38ba30ba | 2519 | c->eip = ctxt->eip; |
e269fb21 | 2520 | c->dst.type = OP_NONE; |
38ba30ba | 2521 | |
e269fb21 JK |
2522 | rc = emulator_do_task_switch(ctxt, ops, tss_selector, reason, |
2523 | has_error_code, error_code); | |
38ba30ba GN |
2524 | |
2525 | if (rc == X86EMUL_CONTINUE) { | |
e269fb21 | 2526 | rc = writeback(ctxt, ops); |
95c55886 GN |
2527 | if (rc == X86EMUL_CONTINUE) |
2528 | ctxt->eip = c->eip; | |
38ba30ba GN |
2529 | } |
2530 | ||
19d04437 | 2531 | return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0; |
38ba30ba GN |
2532 | } |
2533 | ||
a682e354 | 2534 | static void string_addr_inc(struct x86_emulate_ctxt *ctxt, unsigned long base, |
d9271123 | 2535 | int reg, struct operand *op) |
a682e354 GN |
2536 | { |
2537 | struct decode_cache *c = &ctxt->decode; | |
2538 | int df = (ctxt->eflags & EFLG_DF) ? -1 : 1; | |
2539 | ||
d9271123 GN |
2540 | register_address_increment(c, &c->regs[reg], df * op->bytes); |
2541 | op->ptr = (unsigned long *)register_address(c, base, c->regs[reg]); | |
a682e354 GN |
2542 | } |
2543 | ||
8b4caf66 | 2544 | int |
1be3aa47 | 2545 | x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) |
8b4caf66 | 2546 | { |
8b4caf66 | 2547 | u64 msr_data; |
8b4caf66 | 2548 | struct decode_cache *c = &ctxt->decode; |
1b30eaa8 | 2549 | int rc = X86EMUL_CONTINUE; |
5cd21917 | 2550 | int saved_dst_type = c->dst.type; |
8b4caf66 | 2551 | |
9de41573 | 2552 | ctxt->decode.mem_read.pos = 0; |
310b5d30 | 2553 | |
1161624f | 2554 | if (ctxt->mode == X86EMUL_MODE_PROT64 && (c->d & No64)) { |
54b8486f | 2555 | emulate_ud(ctxt); |
1161624f GN |
2556 | goto done; |
2557 | } | |
2558 | ||
d380a5e4 | 2559 | /* LOCK prefix is allowed only with some instructions */ |
a41ffb75 | 2560 | if (c->lock_prefix && (!(c->d & Lock) || c->dst.type != OP_MEM)) { |
54b8486f | 2561 | emulate_ud(ctxt); |
d380a5e4 GN |
2562 | goto done; |
2563 | } | |
2564 | ||
e92805ac | 2565 | /* Privileged instruction can be executed only in CPL=0 */ |
9c537244 | 2566 | if ((c->d & Priv) && ops->cpl(ctxt->vcpu)) { |
54b8486f | 2567 | emulate_gp(ctxt, 0); |
e92805ac GN |
2568 | goto done; |
2569 | } | |
2570 | ||
b9fa9d6b | 2571 | if (c->rep_prefix && (c->d & String)) { |
5cd21917 | 2572 | ctxt->restart = true; |
b9fa9d6b | 2573 | /* All REP prefixes have the same first termination condition */ |
c73e197b | 2574 | if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0) { |
5cd21917 GN |
2575 | string_done: |
2576 | ctxt->restart = false; | |
95c55886 | 2577 | ctxt->eip = c->eip; |
b9fa9d6b AK |
2578 | goto done; |
2579 | } | |
2580 | /* The second termination condition only applies for REPE | |
2581 | * and REPNE. Test if the repeat string operation prefix is | |
2582 | * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the | |
2583 | * corresponding termination condition according to: | |
2584 | * - if REPE/REPZ and ZF = 0 then done | |
2585 | * - if REPNE/REPNZ and ZF = 1 then done | |
2586 | */ | |
2587 | if ((c->b == 0xa6) || (c->b == 0xa7) || | |
5cd21917 | 2588 | (c->b == 0xae) || (c->b == 0xaf)) { |
b9fa9d6b | 2589 | if ((c->rep_prefix == REPE_PREFIX) && |
5cd21917 GN |
2590 | ((ctxt->eflags & EFLG_ZF) == 0)) |
2591 | goto string_done; | |
b9fa9d6b | 2592 | if ((c->rep_prefix == REPNE_PREFIX) && |
5cd21917 GN |
2593 | ((ctxt->eflags & EFLG_ZF) == EFLG_ZF)) |
2594 | goto string_done; | |
b9fa9d6b | 2595 | } |
063db061 | 2596 | c->eip = ctxt->eip; |
b9fa9d6b AK |
2597 | } |
2598 | ||
8b4caf66 | 2599 | if (c->src.type == OP_MEM) { |
9de41573 | 2600 | rc = read_emulated(ctxt, ops, (unsigned long)c->src.ptr, |
414e6277 | 2601 | c->src.valptr, c->src.bytes); |
b60d513c | 2602 | if (rc != X86EMUL_CONTINUE) |
8b4caf66 | 2603 | goto done; |
16518d5a | 2604 | c->src.orig_val64 = c->src.val64; |
8b4caf66 LV |
2605 | } |
2606 | ||
e35b7b9c | 2607 | if (c->src2.type == OP_MEM) { |
9de41573 GN |
2608 | rc = read_emulated(ctxt, ops, (unsigned long)c->src2.ptr, |
2609 | &c->src2.val, c->src2.bytes); | |
e35b7b9c GN |
2610 | if (rc != X86EMUL_CONTINUE) |
2611 | goto done; | |
2612 | } | |
2613 | ||
8b4caf66 LV |
2614 | if ((c->d & DstMask) == ImplicitOps) |
2615 | goto special_insn; | |
2616 | ||
2617 | ||
69f55cb1 GN |
2618 | if ((c->dst.type == OP_MEM) && !(c->d & Mov)) { |
2619 | /* optimisation - avoid slow emulated read if Mov */ | |
9de41573 GN |
2620 | rc = read_emulated(ctxt, ops, (unsigned long)c->dst.ptr, |
2621 | &c->dst.val, c->dst.bytes); | |
69f55cb1 GN |
2622 | if (rc != X86EMUL_CONTINUE) |
2623 | goto done; | |
038e51de | 2624 | } |
e4e03ded | 2625 | c->dst.orig_val = c->dst.val; |
038e51de | 2626 | |
018a98db AK |
2627 | special_insn: |
2628 | ||
e4e03ded | 2629 | if (c->twobyte) |
6aa8b732 AK |
2630 | goto twobyte_insn; |
2631 | ||
e4e03ded | 2632 | switch (c->b) { |
6aa8b732 AK |
2633 | case 0x00 ... 0x05: |
2634 | add: /* add */ | |
05f086f8 | 2635 | emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags); |
6aa8b732 | 2636 | break; |
0934ac9d | 2637 | case 0x06: /* push es */ |
79168fd1 | 2638 | emulate_push_sreg(ctxt, ops, VCPU_SREG_ES); |
0934ac9d MG |
2639 | break; |
2640 | case 0x07: /* pop es */ | |
0934ac9d | 2641 | rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_ES); |
1b30eaa8 | 2642 | if (rc != X86EMUL_CONTINUE) |
0934ac9d MG |
2643 | goto done; |
2644 | break; | |
6aa8b732 AK |
2645 | case 0x08 ... 0x0d: |
2646 | or: /* or */ | |
05f086f8 | 2647 | emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags); |
6aa8b732 | 2648 | break; |
0934ac9d | 2649 | case 0x0e: /* push cs */ |
79168fd1 | 2650 | emulate_push_sreg(ctxt, ops, VCPU_SREG_CS); |
0934ac9d | 2651 | break; |
6aa8b732 AK |
2652 | case 0x10 ... 0x15: |
2653 | adc: /* adc */ | |
05f086f8 | 2654 | emulate_2op_SrcV("adc", c->src, c->dst, ctxt->eflags); |
6aa8b732 | 2655 | break; |
0934ac9d | 2656 | case 0x16: /* push ss */ |
79168fd1 | 2657 | emulate_push_sreg(ctxt, ops, VCPU_SREG_SS); |
0934ac9d MG |
2658 | break; |
2659 | case 0x17: /* pop ss */ | |
0934ac9d | 2660 | rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_SS); |
1b30eaa8 | 2661 | if (rc != X86EMUL_CONTINUE) |
0934ac9d MG |
2662 | goto done; |
2663 | break; | |
6aa8b732 AK |
2664 | case 0x18 ... 0x1d: |
2665 | sbb: /* sbb */ | |
05f086f8 | 2666 | emulate_2op_SrcV("sbb", c->src, c->dst, ctxt->eflags); |
6aa8b732 | 2667 | break; |
0934ac9d | 2668 | case 0x1e: /* push ds */ |
79168fd1 | 2669 | emulate_push_sreg(ctxt, ops, VCPU_SREG_DS); |
0934ac9d MG |
2670 | break; |
2671 | case 0x1f: /* pop ds */ | |
0934ac9d | 2672 | rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_DS); |
1b30eaa8 | 2673 | if (rc != X86EMUL_CONTINUE) |
0934ac9d MG |
2674 | goto done; |
2675 | break; | |
aa3a816b | 2676 | case 0x20 ... 0x25: |
6aa8b732 | 2677 | and: /* and */ |
05f086f8 | 2678 | emulate_2op_SrcV("and", c->src, c->dst, ctxt->eflags); |
6aa8b732 AK |
2679 | break; |
2680 | case 0x28 ... 0x2d: | |
2681 | sub: /* sub */ | |
05f086f8 | 2682 | emulate_2op_SrcV("sub", c->src, c->dst, ctxt->eflags); |
6aa8b732 AK |
2683 | break; |
2684 | case 0x30 ... 0x35: | |
2685 | xor: /* xor */ | |
05f086f8 | 2686 | emulate_2op_SrcV("xor", c->src, c->dst, ctxt->eflags); |
6aa8b732 AK |
2687 | break; |
2688 | case 0x38 ... 0x3d: | |
2689 | cmp: /* cmp */ | |
05f086f8 | 2690 | emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags); |
6aa8b732 | 2691 | break; |
33615aa9 AK |
2692 | case 0x40 ... 0x47: /* inc r16/r32 */ |
2693 | emulate_1op("inc", c->dst, ctxt->eflags); | |
2694 | break; | |
2695 | case 0x48 ... 0x4f: /* dec r16/r32 */ | |
2696 | emulate_1op("dec", c->dst, ctxt->eflags); | |
2697 | break; | |
2698 | case 0x50 ... 0x57: /* push reg */ | |
79168fd1 | 2699 | emulate_push(ctxt, ops); |
33615aa9 AK |
2700 | break; |
2701 | case 0x58 ... 0x5f: /* pop reg */ | |
2702 | pop_instruction: | |
350f69dc | 2703 | rc = emulate_pop(ctxt, ops, &c->dst.val, c->op_bytes); |
1b30eaa8 | 2704 | if (rc != X86EMUL_CONTINUE) |
33615aa9 | 2705 | goto done; |
33615aa9 | 2706 | break; |
abcf14b5 | 2707 | case 0x60: /* pusha */ |
c37eda13 WY |
2708 | rc = emulate_pusha(ctxt, ops); |
2709 | if (rc != X86EMUL_CONTINUE) | |
2710 | goto done; | |
abcf14b5 MG |
2711 | break; |
2712 | case 0x61: /* popa */ | |
2713 | rc = emulate_popa(ctxt, ops); | |
1b30eaa8 | 2714 | if (rc != X86EMUL_CONTINUE) |
abcf14b5 MG |
2715 | goto done; |
2716 | break; | |
6aa8b732 | 2717 | case 0x63: /* movsxd */ |
8b4caf66 | 2718 | if (ctxt->mode != X86EMUL_MODE_PROT64) |
6aa8b732 | 2719 | goto cannot_emulate; |
e4e03ded | 2720 | c->dst.val = (s32) c->src.val; |
6aa8b732 | 2721 | break; |
91ed7a0e | 2722 | case 0x68: /* push imm */ |
018a98db | 2723 | case 0x6a: /* push imm8 */ |
79168fd1 | 2724 | emulate_push(ctxt, ops); |
018a98db AK |
2725 | break; |
2726 | case 0x6c: /* insb */ | |
2727 | case 0x6d: /* insw/insd */ | |
7972995b | 2728 | c->dst.bytes = min(c->dst.bytes, 4u); |
f850e2e6 | 2729 | if (!emulator_io_permited(ctxt, ops, c->regs[VCPU_REGS_RDX], |
7972995b | 2730 | c->dst.bytes)) { |
54b8486f | 2731 | emulate_gp(ctxt, 0); |
f850e2e6 GN |
2732 | goto done; |
2733 | } | |
7b262e90 GN |
2734 | if (!pio_in_emulated(ctxt, ops, c->dst.bytes, |
2735 | c->regs[VCPU_REGS_RDX], &c->dst.val)) | |
7972995b GN |
2736 | goto done; /* IO is needed, skip writeback */ |
2737 | break; | |
018a98db AK |
2738 | case 0x6e: /* outsb */ |
2739 | case 0x6f: /* outsw/outsd */ | |
7972995b | 2740 | c->src.bytes = min(c->src.bytes, 4u); |
f850e2e6 | 2741 | if (!emulator_io_permited(ctxt, ops, c->regs[VCPU_REGS_RDX], |
7972995b | 2742 | c->src.bytes)) { |
54b8486f | 2743 | emulate_gp(ctxt, 0); |
f850e2e6 GN |
2744 | goto done; |
2745 | } | |
7972995b GN |
2746 | ops->pio_out_emulated(c->src.bytes, c->regs[VCPU_REGS_RDX], |
2747 | &c->src.val, 1, ctxt->vcpu); | |
2748 | ||
2749 | c->dst.type = OP_NONE; /* nothing to writeback */ | |
2750 | break; | |
b2833e3c | 2751 | case 0x70 ... 0x7f: /* jcc (short) */ |
018a98db | 2752 | if (test_cc(c->b, ctxt->eflags)) |
b2833e3c | 2753 | jmp_rel(c, c->src.val); |
018a98db | 2754 | break; |
6aa8b732 | 2755 | case 0x80 ... 0x83: /* Grp1 */ |
e4e03ded | 2756 | switch (c->modrm_reg) { |
6aa8b732 AK |
2757 | case 0: |
2758 | goto add; | |
2759 | case 1: | |
2760 | goto or; | |
2761 | case 2: | |
2762 | goto adc; | |
2763 | case 3: | |
2764 | goto sbb; | |
2765 | case 4: | |
2766 | goto and; | |
2767 | case 5: | |
2768 | goto sub; | |
2769 | case 6: | |
2770 | goto xor; | |
2771 | case 7: | |
2772 | goto cmp; | |
2773 | } | |
2774 | break; | |
2775 | case 0x84 ... 0x85: | |
dfb507c4 | 2776 | test: |
05f086f8 | 2777 | emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags); |
6aa8b732 AK |
2778 | break; |
2779 | case 0x86 ... 0x87: /* xchg */ | |
b13354f8 | 2780 | xchg: |
6aa8b732 | 2781 | /* Write back the register source. */ |
e4e03ded | 2782 | switch (c->dst.bytes) { |
6aa8b732 | 2783 | case 1: |
e4e03ded | 2784 | *(u8 *) c->src.ptr = (u8) c->dst.val; |
6aa8b732 AK |
2785 | break; |
2786 | case 2: | |
e4e03ded | 2787 | *(u16 *) c->src.ptr = (u16) c->dst.val; |
6aa8b732 AK |
2788 | break; |
2789 | case 4: | |
e4e03ded | 2790 | *c->src.ptr = (u32) c->dst.val; |
6aa8b732 AK |
2791 | break; /* 64b reg: zero-extend */ |
2792 | case 8: | |
e4e03ded | 2793 | *c->src.ptr = c->dst.val; |
6aa8b732 AK |
2794 | break; |
2795 | } | |
2796 | /* | |
2797 | * Write back the memory destination with implicit LOCK | |
2798 | * prefix. | |
2799 | */ | |
e4e03ded LV |
2800 | c->dst.val = c->src.val; |
2801 | c->lock_prefix = 1; | |
6aa8b732 | 2802 | break; |
6aa8b732 | 2803 | case 0x88 ... 0x8b: /* mov */ |
7de75248 | 2804 | goto mov; |
79168fd1 GN |
2805 | case 0x8c: /* mov r/m, sreg */ |
2806 | if (c->modrm_reg > VCPU_SREG_GS) { | |
54b8486f | 2807 | emulate_ud(ctxt); |
5e3ae6c5 | 2808 | goto done; |
38d5bc6d | 2809 | } |
79168fd1 | 2810 | c->dst.val = ops->get_segment_selector(c->modrm_reg, ctxt->vcpu); |
38d5bc6d | 2811 | break; |
7e0b54b1 | 2812 | case 0x8d: /* lea r16/r32, m */ |
f9b7aab3 | 2813 | c->dst.val = c->modrm_ea; |
7e0b54b1 | 2814 | break; |
4257198a GT |
2815 | case 0x8e: { /* mov seg, r/m16 */ |
2816 | uint16_t sel; | |
4257198a GT |
2817 | |
2818 | sel = c->src.val; | |
8b9f4414 | 2819 | |
c697518a GN |
2820 | if (c->modrm_reg == VCPU_SREG_CS || |
2821 | c->modrm_reg > VCPU_SREG_GS) { | |
54b8486f | 2822 | emulate_ud(ctxt); |
8b9f4414 GN |
2823 | goto done; |
2824 | } | |
2825 | ||
310b5d30 | 2826 | if (c->modrm_reg == VCPU_SREG_SS) |
95cb2295 | 2827 | ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS; |
310b5d30 | 2828 | |
2e873022 | 2829 | rc = load_segment_descriptor(ctxt, ops, sel, c->modrm_reg); |
4257198a GT |
2830 | |
2831 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
2832 | break; | |
2833 | } | |
6aa8b732 | 2834 | case 0x8f: /* pop (sole member of Grp1a) */ |
8cdbd2c9 | 2835 | rc = emulate_grp1a(ctxt, ops); |
1b30eaa8 | 2836 | if (rc != X86EMUL_CONTINUE) |
6aa8b732 | 2837 | goto done; |
6aa8b732 | 2838 | break; |
b13354f8 | 2839 | case 0x90: /* nop / xchg r8,rax */ |
b8a98945 GN |
2840 | if (c->dst.ptr == (unsigned long *)&c->regs[VCPU_REGS_RAX]) { |
2841 | c->dst.type = OP_NONE; /* nop */ | |
b13354f8 MG |
2842 | break; |
2843 | } | |
2844 | case 0x91 ... 0x97: /* xchg reg,rax */ | |
f0c13ef1 GN |
2845 | c->src.type = OP_REG; |
2846 | c->src.bytes = c->op_bytes; | |
b13354f8 MG |
2847 | c->src.ptr = (unsigned long *) &c->regs[VCPU_REGS_RAX]; |
2848 | c->src.val = *(c->src.ptr); | |
2849 | goto xchg; | |
fd2a7608 | 2850 | case 0x9c: /* pushf */ |
05f086f8 | 2851 | c->src.val = (unsigned long) ctxt->eflags; |
79168fd1 | 2852 | emulate_push(ctxt, ops); |
8cdbd2c9 | 2853 | break; |
535eabcf | 2854 | case 0x9d: /* popf */ |
2b48cc75 | 2855 | c->dst.type = OP_REG; |
05f086f8 | 2856 | c->dst.ptr = (unsigned long *) &ctxt->eflags; |
2b48cc75 | 2857 | c->dst.bytes = c->op_bytes; |
d4c6a154 GN |
2858 | rc = emulate_popf(ctxt, ops, &c->dst.val, c->op_bytes); |
2859 | if (rc != X86EMUL_CONTINUE) | |
2860 | goto done; | |
2861 | break; | |
5d55f299 | 2862 | case 0xa0 ... 0xa3: /* mov */ |
6aa8b732 | 2863 | case 0xa4 ... 0xa5: /* movs */ |
a682e354 | 2864 | goto mov; |
6aa8b732 | 2865 | case 0xa6 ... 0xa7: /* cmps */ |
d7e5117a | 2866 | c->dst.type = OP_NONE; /* Disable writeback. */ |
d7e5117a | 2867 | DPRINTF("cmps: mem1=0x%p mem2=0x%p\n", c->src.ptr, c->dst.ptr); |
a682e354 | 2868 | goto cmp; |
dfb507c4 MG |
2869 | case 0xa8 ... 0xa9: /* test ax, imm */ |
2870 | goto test; | |
6aa8b732 | 2871 | case 0xaa ... 0xab: /* stos */ |
e4e03ded | 2872 | c->dst.val = c->regs[VCPU_REGS_RAX]; |
6aa8b732 AK |
2873 | break; |
2874 | case 0xac ... 0xad: /* lods */ | |
a682e354 | 2875 | goto mov; |
6aa8b732 AK |
2876 | case 0xae ... 0xaf: /* scas */ |
2877 | DPRINTF("Urk! I don't handle SCAS.\n"); | |
2878 | goto cannot_emulate; | |
a5e2e82b | 2879 | case 0xb0 ... 0xbf: /* mov r, imm */ |
615ac125 | 2880 | goto mov; |
018a98db AK |
2881 | case 0xc0 ... 0xc1: |
2882 | emulate_grp2(ctxt); | |
2883 | break; | |
111de5d6 | 2884 | case 0xc3: /* ret */ |
cf5de4f8 | 2885 | c->dst.type = OP_REG; |
111de5d6 | 2886 | c->dst.ptr = &c->eip; |
cf5de4f8 | 2887 | c->dst.bytes = c->op_bytes; |
111de5d6 | 2888 | goto pop_instruction; |
018a98db AK |
2889 | case 0xc6 ... 0xc7: /* mov (sole member of Grp11) */ |
2890 | mov: | |
2891 | c->dst.val = c->src.val; | |
2892 | break; | |
a77ab5ea AK |
2893 | case 0xcb: /* ret far */ |
2894 | rc = emulate_ret_far(ctxt, ops); | |
1b30eaa8 | 2895 | if (rc != X86EMUL_CONTINUE) |
a77ab5ea AK |
2896 | goto done; |
2897 | break; | |
018a98db AK |
2898 | case 0xd0 ... 0xd1: /* Grp2 */ |
2899 | c->src.val = 1; | |
2900 | emulate_grp2(ctxt); | |
2901 | break; | |
2902 | case 0xd2 ... 0xd3: /* Grp2 */ | |
2903 | c->src.val = c->regs[VCPU_REGS_RCX]; | |
2904 | emulate_grp2(ctxt); | |
2905 | break; | |
a6a3034c MG |
2906 | case 0xe4: /* inb */ |
2907 | case 0xe5: /* in */ | |
cf8f70bf | 2908 | goto do_io_in; |
a6a3034c MG |
2909 | case 0xe6: /* outb */ |
2910 | case 0xe7: /* out */ | |
cf8f70bf | 2911 | goto do_io_out; |
1a52e051 | 2912 | case 0xe8: /* call (near) */ { |
d53c4777 | 2913 | long int rel = c->src.val; |
e4e03ded | 2914 | c->src.val = (unsigned long) c->eip; |
7a957275 | 2915 | jmp_rel(c, rel); |
79168fd1 | 2916 | emulate_push(ctxt, ops); |
8cdbd2c9 | 2917 | break; |
1a52e051 NK |
2918 | } |
2919 | case 0xe9: /* jmp rel */ | |
954cd36f | 2920 | goto jmp; |
414e6277 GN |
2921 | case 0xea: { /* jmp far */ |
2922 | unsigned short sel; | |
ea79849d | 2923 | jump_far: |
414e6277 GN |
2924 | memcpy(&sel, c->src.valptr + c->op_bytes, 2); |
2925 | ||
2926 | if (load_segment_descriptor(ctxt, ops, sel, VCPU_SREG_CS)) | |
c697518a | 2927 | goto done; |
954cd36f | 2928 | |
414e6277 GN |
2929 | c->eip = 0; |
2930 | memcpy(&c->eip, c->src.valptr, c->op_bytes); | |
954cd36f | 2931 | break; |
414e6277 | 2932 | } |
954cd36f GT |
2933 | case 0xeb: |
2934 | jmp: /* jmp rel short */ | |
7a957275 | 2935 | jmp_rel(c, c->src.val); |
a01af5ec | 2936 | c->dst.type = OP_NONE; /* Disable writeback. */ |
1a52e051 | 2937 | break; |
a6a3034c MG |
2938 | case 0xec: /* in al,dx */ |
2939 | case 0xed: /* in (e/r)ax,dx */ | |
cf8f70bf GN |
2940 | c->src.val = c->regs[VCPU_REGS_RDX]; |
2941 | do_io_in: | |
2942 | c->dst.bytes = min(c->dst.bytes, 4u); | |
2943 | if (!emulator_io_permited(ctxt, ops, c->src.val, c->dst.bytes)) { | |
54b8486f | 2944 | emulate_gp(ctxt, 0); |
cf8f70bf GN |
2945 | goto done; |
2946 | } | |
7b262e90 GN |
2947 | if (!pio_in_emulated(ctxt, ops, c->dst.bytes, c->src.val, |
2948 | &c->dst.val)) | |
cf8f70bf GN |
2949 | goto done; /* IO is needed */ |
2950 | break; | |
ce7a0ad3 WY |
2951 | case 0xee: /* out dx,al */ |
2952 | case 0xef: /* out dx,(e/r)ax */ | |
cf8f70bf GN |
2953 | c->src.val = c->regs[VCPU_REGS_RDX]; |
2954 | do_io_out: | |
2955 | c->dst.bytes = min(c->dst.bytes, 4u); | |
2956 | if (!emulator_io_permited(ctxt, ops, c->src.val, c->dst.bytes)) { | |
54b8486f | 2957 | emulate_gp(ctxt, 0); |
f850e2e6 GN |
2958 | goto done; |
2959 | } | |
cf8f70bf GN |
2960 | ops->pio_out_emulated(c->dst.bytes, c->src.val, &c->dst.val, 1, |
2961 | ctxt->vcpu); | |
2962 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
e93f36bc | 2963 | break; |
111de5d6 | 2964 | case 0xf4: /* hlt */ |
ad312c7c | 2965 | ctxt->vcpu->arch.halt_request = 1; |
19fdfa0d | 2966 | break; |
111de5d6 AK |
2967 | case 0xf5: /* cmc */ |
2968 | /* complement carry flag from eflags reg */ | |
2969 | ctxt->eflags ^= EFLG_CF; | |
2970 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
2971 | break; | |
018a98db | 2972 | case 0xf6 ... 0xf7: /* Grp3 */ |
aca06a83 GN |
2973 | if (!emulate_grp3(ctxt, ops)) |
2974 | goto cannot_emulate; | |
018a98db | 2975 | break; |
111de5d6 AK |
2976 | case 0xf8: /* clc */ |
2977 | ctxt->eflags &= ~EFLG_CF; | |
2978 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
2979 | break; | |
2980 | case 0xfa: /* cli */ | |
07cbc6c1 | 2981 | if (emulator_bad_iopl(ctxt, ops)) { |
54b8486f | 2982 | emulate_gp(ctxt, 0); |
07cbc6c1 WY |
2983 | goto done; |
2984 | } else { | |
f850e2e6 GN |
2985 | ctxt->eflags &= ~X86_EFLAGS_IF; |
2986 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
2987 | } | |
111de5d6 AK |
2988 | break; |
2989 | case 0xfb: /* sti */ | |
07cbc6c1 | 2990 | if (emulator_bad_iopl(ctxt, ops)) { |
54b8486f | 2991 | emulate_gp(ctxt, 0); |
07cbc6c1 WY |
2992 | goto done; |
2993 | } else { | |
95cb2295 | 2994 | ctxt->interruptibility = KVM_X86_SHADOW_INT_STI; |
f850e2e6 GN |
2995 | ctxt->eflags |= X86_EFLAGS_IF; |
2996 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
2997 | } | |
111de5d6 | 2998 | break; |
fb4616f4 MG |
2999 | case 0xfc: /* cld */ |
3000 | ctxt->eflags &= ~EFLG_DF; | |
3001 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
3002 | break; | |
3003 | case 0xfd: /* std */ | |
3004 | ctxt->eflags |= EFLG_DF; | |
3005 | c->dst.type = OP_NONE; /* Disable writeback. */ | |
3006 | break; | |
ea79849d GN |
3007 | case 0xfe: /* Grp4 */ |
3008 | grp45: | |
018a98db | 3009 | rc = emulate_grp45(ctxt, ops); |
1b30eaa8 | 3010 | if (rc != X86EMUL_CONTINUE) |
018a98db AK |
3011 | goto done; |
3012 | break; | |
ea79849d GN |
3013 | case 0xff: /* Grp5 */ |
3014 | if (c->modrm_reg == 5) | |
3015 | goto jump_far; | |
3016 | goto grp45; | |
91269b8f AK |
3017 | default: |
3018 | goto cannot_emulate; | |
6aa8b732 | 3019 | } |
018a98db AK |
3020 | |
3021 | writeback: | |
3022 | rc = writeback(ctxt, ops); | |
1b30eaa8 | 3023 | if (rc != X86EMUL_CONTINUE) |
018a98db AK |
3024 | goto done; |
3025 | ||
5cd21917 GN |
3026 | /* |
3027 | * restore dst type in case the decoding will be reused | |
3028 | * (happens for string instruction ) | |
3029 | */ | |
3030 | c->dst.type = saved_dst_type; | |
3031 | ||
a682e354 | 3032 | if ((c->d & SrcMask) == SrcSI) |
79168fd1 GN |
3033 | string_addr_inc(ctxt, seg_override_base(ctxt, ops, c), |
3034 | VCPU_REGS_RSI, &c->src); | |
a682e354 GN |
3035 | |
3036 | if ((c->d & DstMask) == DstDI) | |
79168fd1 GN |
3037 | string_addr_inc(ctxt, es_base(ctxt, ops), VCPU_REGS_RDI, |
3038 | &c->dst); | |
d9271123 | 3039 | |
5cd21917 | 3040 | if (c->rep_prefix && (c->d & String)) { |
7b262e90 | 3041 | struct read_cache *rc = &ctxt->decode.io_read; |
d9271123 | 3042 | register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1); |
7b262e90 GN |
3043 | /* |
3044 | * Re-enter guest when pio read ahead buffer is empty or, | |
3045 | * if it is not used, after each 1024 iteration. | |
3046 | */ | |
3047 | if ((rc->end == 0 && !(c->regs[VCPU_REGS_RCX] & 0x3ff)) || | |
3048 | (rc->end != 0 && rc->end == rc->pos)) | |
5cd21917 GN |
3049 | ctxt->restart = false; |
3050 | } | |
9de41573 GN |
3051 | /* |
3052 | * reset read cache here in case string instruction is restared | |
3053 | * without decoding | |
3054 | */ | |
3055 | ctxt->decode.mem_read.end = 0; | |
95c55886 | 3056 | ctxt->eip = c->eip; |
018a98db AK |
3057 | |
3058 | done: | |
cb404fe0 | 3059 | return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0; |
6aa8b732 AK |
3060 | |
3061 | twobyte_insn: | |
e4e03ded | 3062 | switch (c->b) { |
6aa8b732 | 3063 | case 0x01: /* lgdt, lidt, lmsw */ |
e4e03ded | 3064 | switch (c->modrm_reg) { |
6aa8b732 AK |
3065 | u16 size; |
3066 | unsigned long address; | |
3067 | ||
aca7f966 | 3068 | case 0: /* vmcall */ |
e4e03ded | 3069 | if (c->modrm_mod != 3 || c->modrm_rm != 1) |
aca7f966 AL |
3070 | goto cannot_emulate; |
3071 | ||
7aa81cc0 | 3072 | rc = kvm_fix_hypercall(ctxt->vcpu); |
1b30eaa8 | 3073 | if (rc != X86EMUL_CONTINUE) |
7aa81cc0 AL |
3074 | goto done; |
3075 | ||
33e3885d | 3076 | /* Let the processor re-execute the fixed hypercall */ |
063db061 | 3077 | c->eip = ctxt->eip; |
16286d08 AK |
3078 | /* Disable writeback. */ |
3079 | c->dst.type = OP_NONE; | |
aca7f966 | 3080 | break; |
6aa8b732 | 3081 | case 2: /* lgdt */ |
e4e03ded LV |
3082 | rc = read_descriptor(ctxt, ops, c->src.ptr, |
3083 | &size, &address, c->op_bytes); | |
1b30eaa8 | 3084 | if (rc != X86EMUL_CONTINUE) |
6aa8b732 AK |
3085 | goto done; |
3086 | realmode_lgdt(ctxt->vcpu, size, address); | |
16286d08 AK |
3087 | /* Disable writeback. */ |
3088 | c->dst.type = OP_NONE; | |
6aa8b732 | 3089 | break; |
aca7f966 | 3090 | case 3: /* lidt/vmmcall */ |
2b3d2a20 AK |
3091 | if (c->modrm_mod == 3) { |
3092 | switch (c->modrm_rm) { | |
3093 | case 1: | |
3094 | rc = kvm_fix_hypercall(ctxt->vcpu); | |
1b30eaa8 | 3095 | if (rc != X86EMUL_CONTINUE) |
2b3d2a20 AK |
3096 | goto done; |
3097 | break; | |
3098 | default: | |
3099 | goto cannot_emulate; | |
3100 | } | |
aca7f966 | 3101 | } else { |
e4e03ded | 3102 | rc = read_descriptor(ctxt, ops, c->src.ptr, |
aca7f966 | 3103 | &size, &address, |
e4e03ded | 3104 | c->op_bytes); |
1b30eaa8 | 3105 | if (rc != X86EMUL_CONTINUE) |
aca7f966 AL |
3106 | goto done; |
3107 | realmode_lidt(ctxt->vcpu, size, address); | |
3108 | } | |
16286d08 AK |
3109 | /* Disable writeback. */ |
3110 | c->dst.type = OP_NONE; | |
6aa8b732 AK |
3111 | break; |
3112 | case 4: /* smsw */ | |
16286d08 | 3113 | c->dst.bytes = 2; |
52a46617 | 3114 | c->dst.val = ops->get_cr(0, ctxt->vcpu); |
6aa8b732 AK |
3115 | break; |
3116 | case 6: /* lmsw */ | |
93a152be GN |
3117 | ops->set_cr(0, (ops->get_cr(0, ctxt->vcpu) & ~0x0ful) | |
3118 | (c->src.val & 0x0f), ctxt->vcpu); | |
dc7457ea | 3119 | c->dst.type = OP_NONE; |
6aa8b732 | 3120 | break; |
6e1e5ffe | 3121 | case 5: /* not defined */ |
54b8486f | 3122 | emulate_ud(ctxt); |
6e1e5ffe | 3123 | goto done; |
6aa8b732 | 3124 | case 7: /* invlpg*/ |
69f55cb1 | 3125 | emulate_invlpg(ctxt->vcpu, c->modrm_ea); |
16286d08 AK |
3126 | /* Disable writeback. */ |
3127 | c->dst.type = OP_NONE; | |
6aa8b732 AK |
3128 | break; |
3129 | default: | |
3130 | goto cannot_emulate; | |
3131 | } | |
3132 | break; | |
e99f0507 | 3133 | case 0x05: /* syscall */ |
3fb1b5db | 3134 | rc = emulate_syscall(ctxt, ops); |
e54cfa97 TY |
3135 | if (rc != X86EMUL_CONTINUE) |
3136 | goto done; | |
e66bb2cc AP |
3137 | else |
3138 | goto writeback; | |
e99f0507 | 3139 | break; |
018a98db AK |
3140 | case 0x06: |
3141 | emulate_clts(ctxt->vcpu); | |
3142 | c->dst.type = OP_NONE; | |
3143 | break; | |
018a98db | 3144 | case 0x09: /* wbinvd */ |
f5f48ee1 SY |
3145 | kvm_emulate_wbinvd(ctxt->vcpu); |
3146 | c->dst.type = OP_NONE; | |
3147 | break; | |
3148 | case 0x08: /* invd */ | |
018a98db AK |
3149 | case 0x0d: /* GrpP (prefetch) */ |
3150 | case 0x18: /* Grp16 (prefetch/nop) */ | |
3151 | c->dst.type = OP_NONE; | |
3152 | break; | |
3153 | case 0x20: /* mov cr, reg */ | |
6aebfa6e GN |
3154 | switch (c->modrm_reg) { |
3155 | case 1: | |
3156 | case 5 ... 7: | |
3157 | case 9 ... 15: | |
54b8486f | 3158 | emulate_ud(ctxt); |
6aebfa6e GN |
3159 | goto done; |
3160 | } | |
52a46617 | 3161 | c->regs[c->modrm_rm] = ops->get_cr(c->modrm_reg, ctxt->vcpu); |
018a98db AK |
3162 | c->dst.type = OP_NONE; /* no writeback */ |
3163 | break; | |
6aa8b732 | 3164 | case 0x21: /* mov from dr to reg */ |
1e470be5 GN |
3165 | if ((ops->get_cr(4, ctxt->vcpu) & X86_CR4_DE) && |
3166 | (c->modrm_reg == 4 || c->modrm_reg == 5)) { | |
54b8486f | 3167 | emulate_ud(ctxt); |
1e470be5 GN |
3168 | goto done; |
3169 | } | |
35aa5375 | 3170 | ops->get_dr(c->modrm_reg, &c->regs[c->modrm_rm], ctxt->vcpu); |
a01af5ec | 3171 | c->dst.type = OP_NONE; /* no writeback */ |
6aa8b732 | 3172 | break; |
018a98db | 3173 | case 0x22: /* mov reg, cr */ |
0f12244f | 3174 | if (ops->set_cr(c->modrm_reg, c->modrm_val, ctxt->vcpu)) { |
54b8486f | 3175 | emulate_gp(ctxt, 0); |
0f12244f GN |
3176 | goto done; |
3177 | } | |
018a98db AK |
3178 | c->dst.type = OP_NONE; |
3179 | break; | |
6aa8b732 | 3180 | case 0x23: /* mov from reg to dr */ |
1e470be5 GN |
3181 | if ((ops->get_cr(4, ctxt->vcpu) & X86_CR4_DE) && |
3182 | (c->modrm_reg == 4 || c->modrm_reg == 5)) { | |
54b8486f | 3183 | emulate_ud(ctxt); |
1e470be5 GN |
3184 | goto done; |
3185 | } | |
35aa5375 | 3186 | |
338dbc97 GN |
3187 | if (ops->set_dr(c->modrm_reg, c->regs[c->modrm_rm] & |
3188 | ((ctxt->mode == X86EMUL_MODE_PROT64) ? | |
3189 | ~0ULL : ~0U), ctxt->vcpu) < 0) { | |
3190 | /* #UD condition is already handled by the code above */ | |
54b8486f | 3191 | emulate_gp(ctxt, 0); |
338dbc97 GN |
3192 | goto done; |
3193 | } | |
3194 | ||
a01af5ec | 3195 | c->dst.type = OP_NONE; /* no writeback */ |
6aa8b732 | 3196 | break; |
018a98db AK |
3197 | case 0x30: |
3198 | /* wrmsr */ | |
3199 | msr_data = (u32)c->regs[VCPU_REGS_RAX] | |
3200 | | ((u64)c->regs[VCPU_REGS_RDX] << 32); | |
3fb1b5db | 3201 | if (ops->set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data)) { |
54b8486f | 3202 | emulate_gp(ctxt, 0); |
fd525365 | 3203 | goto done; |
018a98db AK |
3204 | } |
3205 | rc = X86EMUL_CONTINUE; | |
3206 | c->dst.type = OP_NONE; | |
3207 | break; | |
3208 | case 0x32: | |
3209 | /* rdmsr */ | |
3fb1b5db | 3210 | if (ops->get_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], &msr_data)) { |
54b8486f | 3211 | emulate_gp(ctxt, 0); |
fd525365 | 3212 | goto done; |
018a98db AK |
3213 | } else { |
3214 | c->regs[VCPU_REGS_RAX] = (u32)msr_data; | |
3215 | c->regs[VCPU_REGS_RDX] = msr_data >> 32; | |
3216 | } | |
3217 | rc = X86EMUL_CONTINUE; | |
3218 | c->dst.type = OP_NONE; | |
3219 | break; | |
e99f0507 | 3220 | case 0x34: /* sysenter */ |
3fb1b5db | 3221 | rc = emulate_sysenter(ctxt, ops); |
e54cfa97 TY |
3222 | if (rc != X86EMUL_CONTINUE) |
3223 | goto done; | |
8c604352 AP |
3224 | else |
3225 | goto writeback; | |
e99f0507 AP |
3226 | break; |
3227 | case 0x35: /* sysexit */ | |
3fb1b5db | 3228 | rc = emulate_sysexit(ctxt, ops); |
e54cfa97 TY |
3229 | if (rc != X86EMUL_CONTINUE) |
3230 | goto done; | |
4668f050 AP |
3231 | else |
3232 | goto writeback; | |
e99f0507 | 3233 | break; |
6aa8b732 | 3234 | case 0x40 ... 0x4f: /* cmov */ |
e4e03ded | 3235 | c->dst.val = c->dst.orig_val = c->src.val; |
a01af5ec LV |
3236 | if (!test_cc(c->b, ctxt->eflags)) |
3237 | c->dst.type = OP_NONE; /* no writeback */ | |
6aa8b732 | 3238 | break; |
b2833e3c | 3239 | case 0x80 ... 0x8f: /* jnz rel, etc*/ |
018a98db | 3240 | if (test_cc(c->b, ctxt->eflags)) |
b2833e3c | 3241 | jmp_rel(c, c->src.val); |
018a98db AK |
3242 | c->dst.type = OP_NONE; |
3243 | break; | |
0934ac9d | 3244 | case 0xa0: /* push fs */ |
79168fd1 | 3245 | emulate_push_sreg(ctxt, ops, VCPU_SREG_FS); |
0934ac9d MG |
3246 | break; |
3247 | case 0xa1: /* pop fs */ | |
3248 | rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_FS); | |
1b30eaa8 | 3249 | if (rc != X86EMUL_CONTINUE) |
0934ac9d MG |
3250 | goto done; |
3251 | break; | |
7de75248 NK |
3252 | case 0xa3: |
3253 | bt: /* bt */ | |
e4f8e039 | 3254 | c->dst.type = OP_NONE; |
e4e03ded LV |
3255 | /* only subword offset */ |
3256 | c->src.val &= (c->dst.bytes << 3) - 1; | |
05f086f8 | 3257 | emulate_2op_SrcV_nobyte("bt", c->src, c->dst, ctxt->eflags); |
7de75248 | 3258 | break; |
9bf8ea42 GT |
3259 | case 0xa4: /* shld imm8, r, r/m */ |
3260 | case 0xa5: /* shld cl, r, r/m */ | |
3261 | emulate_2op_cl("shld", c->src2, c->src, c->dst, ctxt->eflags); | |
3262 | break; | |
0934ac9d | 3263 | case 0xa8: /* push gs */ |
79168fd1 | 3264 | emulate_push_sreg(ctxt, ops, VCPU_SREG_GS); |
0934ac9d MG |
3265 | break; |
3266 | case 0xa9: /* pop gs */ | |
3267 | rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_GS); | |
1b30eaa8 | 3268 | if (rc != X86EMUL_CONTINUE) |
0934ac9d MG |
3269 | goto done; |
3270 | break; | |
7de75248 NK |
3271 | case 0xab: |
3272 | bts: /* bts */ | |
e4e03ded LV |
3273 | /* only subword offset */ |
3274 | c->src.val &= (c->dst.bytes << 3) - 1; | |
05f086f8 | 3275 | emulate_2op_SrcV_nobyte("bts", c->src, c->dst, ctxt->eflags); |
7de75248 | 3276 | break; |
9bf8ea42 GT |
3277 | case 0xac: /* shrd imm8, r, r/m */ |
3278 | case 0xad: /* shrd cl, r, r/m */ | |
3279 | emulate_2op_cl("shrd", c->src2, c->src, c->dst, ctxt->eflags); | |
3280 | break; | |
2a7c5b8b GC |
3281 | case 0xae: /* clflush */ |
3282 | break; | |
6aa8b732 AK |
3283 | case 0xb0 ... 0xb1: /* cmpxchg */ |
3284 | /* | |
3285 | * Save real source value, then compare EAX against | |
3286 | * destination. | |
3287 | */ | |
e4e03ded LV |
3288 | c->src.orig_val = c->src.val; |
3289 | c->src.val = c->regs[VCPU_REGS_RAX]; | |
05f086f8 LV |
3290 | emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags); |
3291 | if (ctxt->eflags & EFLG_ZF) { | |
6aa8b732 | 3292 | /* Success: write back to memory. */ |
e4e03ded | 3293 | c->dst.val = c->src.orig_val; |
6aa8b732 AK |
3294 | } else { |
3295 | /* Failure: write the value we saw to EAX. */ | |
e4e03ded LV |
3296 | c->dst.type = OP_REG; |
3297 | c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX]; | |
6aa8b732 AK |
3298 | } |
3299 | break; | |
6aa8b732 AK |
3300 | case 0xb3: |
3301 | btr: /* btr */ | |
e4e03ded LV |
3302 | /* only subword offset */ |
3303 | c->src.val &= (c->dst.bytes << 3) - 1; | |
05f086f8 | 3304 | emulate_2op_SrcV_nobyte("btr", c->src, c->dst, ctxt->eflags); |
6aa8b732 | 3305 | break; |
6aa8b732 | 3306 | case 0xb6 ... 0xb7: /* movzx */ |
e4e03ded LV |
3307 | c->dst.bytes = c->op_bytes; |
3308 | c->dst.val = (c->d & ByteOp) ? (u8) c->src.val | |
3309 | : (u16) c->src.val; | |
6aa8b732 | 3310 | break; |
6aa8b732 | 3311 | case 0xba: /* Grp8 */ |
e4e03ded | 3312 | switch (c->modrm_reg & 3) { |
6aa8b732 AK |
3313 | case 0: |
3314 | goto bt; | |
3315 | case 1: | |
3316 | goto bts; | |
3317 | case 2: | |
3318 | goto btr; | |
3319 | case 3: | |
3320 | goto btc; | |
3321 | } | |
3322 | break; | |
7de75248 NK |
3323 | case 0xbb: |
3324 | btc: /* btc */ | |
e4e03ded LV |
3325 | /* only subword offset */ |
3326 | c->src.val &= (c->dst.bytes << 3) - 1; | |
05f086f8 | 3327 | emulate_2op_SrcV_nobyte("btc", c->src, c->dst, ctxt->eflags); |
7de75248 | 3328 | break; |
6aa8b732 | 3329 | case 0xbe ... 0xbf: /* movsx */ |
e4e03ded LV |
3330 | c->dst.bytes = c->op_bytes; |
3331 | c->dst.val = (c->d & ByteOp) ? (s8) c->src.val : | |
3332 | (s16) c->src.val; | |
6aa8b732 | 3333 | break; |
a012e65a | 3334 | case 0xc3: /* movnti */ |
e4e03ded LV |
3335 | c->dst.bytes = c->op_bytes; |
3336 | c->dst.val = (c->op_bytes == 4) ? (u32) c->src.val : | |
3337 | (u64) c->src.val; | |
a012e65a | 3338 | break; |
6aa8b732 | 3339 | case 0xc7: /* Grp9 (cmpxchg8b) */ |
69f55cb1 | 3340 | rc = emulate_grp9(ctxt, ops); |
1b30eaa8 | 3341 | if (rc != X86EMUL_CONTINUE) |
8cdbd2c9 LV |
3342 | goto done; |
3343 | break; | |
91269b8f AK |
3344 | default: |
3345 | goto cannot_emulate; | |
6aa8b732 AK |
3346 | } |
3347 | goto writeback; | |
3348 | ||
3349 | cannot_emulate: | |
e4e03ded | 3350 | DPRINTF("Cannot emulate %02x\n", c->b); |
6aa8b732 AK |
3351 | return -1; |
3352 | } |