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KVM: x86 emulator mark VMMCALL and LMSW as privileged
[linux-2.6-block.git] / arch / x86 / kvm / emulate.c
CommitLineData
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
12 *
13 * Avi Kivity <avi@qumranet.com>
14 * Yaniv Kamay <yaniv@qumranet.com>
15 *
16 * This work is licensed under the terms of the GNU GPL, version 2. See
17 * the COPYING file in the top-level directory.
18 *
19 * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
20 */
21
22#ifndef __KERNEL__
23#include <stdio.h>
24#include <stdint.h>
25#include <public/xen.h>
d77c26fc 26#define DPRINTF(_f, _a ...) printf(_f , ## _a)
6aa8b732 27#else
edf88417 28#include <linux/kvm_host.h>
5fdbf976 29#include "kvm_cache_regs.h"
6aa8b732
AK		 30#define DPRINTF(x...) do {} while (0)
31#endif
6aa8b732 32#include <linux/module.h>
56e82318 33#include <asm/kvm_emulate.h>
6aa8b732 34
3eeb3288 35#include "x86.h"
e99f0507 36
6aa8b732
AK		 37/*
38 * Opcode effective-address decode tables.
39 * Note that we only emulate instructions that have at least one memory
40 * operand (excluding implicit stack references). We assume that stack
41 * references and instruction fetches will never occur in special memory
42 * areas that require emulation. So, for example, 'mov <imm>,<reg>' need
43 * not be handled.
44 */
45
46/* Operand sizes: 8-bit operands or specified/overridden size. */
47#define ByteOp (1<<0) /* 8-bit operands. */
48/* Destination operand type. */
49#define ImplicitOps (1<<1) /* Implicit in opcode. No generic decode. */
50#define DstReg (2<<1) /* Register operand. */
51#define DstMem (3<<1) /* Memory operand. */
9c9fddd0
GT		 52#define DstAcc (4<<1) /* Destination Accumulator */
53#define DstMask (7<<1)
6aa8b732 54/* Source operand type. */
9c9fddd0
GT		 55#define SrcNone (0<<4) /* No source operand. */
56#define SrcImplicit (0<<4) /* Source operand is implicit in the opcode. */
57#define SrcReg (1<<4) /* Register operand. */
58#define SrcMem (2<<4) /* Memory operand. */
59#define SrcMem16 (3<<4) /* Memory operand (16-bit). */
60#define SrcMem32 (4<<4) /* Memory operand (32-bit). */
61#define SrcImm (5<<4) /* Immediate operand. */
62#define SrcImmByte (6<<4) /* 8-bit sign-extended immediate operand. */
bfcadf83 63#define SrcOne (7<<4) /* Implied '1' */
341de7e3 64#define SrcImmUByte (8<<4) /* 8-bit unsigned immediate operand. */
c9eaf20f 65#define SrcImmU (9<<4) /* Immediate operand, unsigned */
341de7e3 66#define SrcMask (0xf<<4)
6aa8b732 67/* Generic ModRM decode. */
341de7e3 68#define ModRM (1<<8)
6aa8b732 69/* Destination is only written; never read. */
341de7e3
GN		 70#define Mov (1<<9)
71#define BitOp (1<<10)
72#define MemAbs (1<<11) /* Memory operand is absolute displacement */
9c9fddd0
GT		 73#define String (1<<12) /* String instruction (rep capable) */
74#define Stack (1<<13) /* Stack instruction (push/pop) */
e09d082c
AK		 75#define Group (1<<14) /* Bits 3:5 of modrm byte extend opcode */
76#define GroupDual (1<<15) /* Alternate decoding of mod == 3 */
77#define GroupMask 0xff /* Group number stored in bits 0:7 */
d8769fed 78/* Misc flags */
d380a5e4 79#define Lock (1<<26) /* lock prefix is allowed for the instruction */
e92805ac 80#define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */
d8769fed 81#define No64 (1<<28)
0dc8d10f
GT		 82/* Source 2 operand type */
83#define Src2None (0<<29)
84#define Src2CL (1<<29)
85#define Src2ImmByte (2<<29)
86#define Src2One (3<<29)
a5f868bd 87#define Src2Imm16 (4<<29)
e35b7b9c
GN		 88#define Src2Mem16 (5<<29) /* Used for Ep encoding. First argument has to be
89 in memory and second argument is located
90 immediately after the first one in memory. */
0dc8d10f 91#define Src2Mask (7<<29)
6aa8b732 92
43bb19cd 93enum {
1d6ad207 94 Group1_80, Group1_81, Group1_82, Group1_83,
d95058a1 95 Group1A, Group3_Byte, Group3, Group4, Group5, Group7,
60a29d4e 96 Group8, Group9,
43bb19cd
AK		 97};
98
45ed60b3 99static u32 opcode_table[256] = {
6aa8b732 100 /* 0x00 - 0x07 */
d380a5e4 101 ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
6aa8b732 102 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
0934ac9d 103 ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
d8769fed 104 ImplicitOps | Stack | No64, ImplicitOps | Stack | No64,
6aa8b732 105 /* 0x08 - 0x0F */
d380a5e4 106 ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
6aa8b732 107 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
94677e61
MG		 108 ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
109 ImplicitOps | Stack | No64, 0,
6aa8b732 110 /* 0x10 - 0x17 */
d380a5e4 111 ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
6aa8b732 112 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
0934ac9d 113 ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
d8769fed 114 ImplicitOps | Stack | No64, ImplicitOps | Stack | No64,
6aa8b732 115 /* 0x18 - 0x1F */
d380a5e4 116 ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
6aa8b732 117 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
0934ac9d 118 ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
d8769fed 119 ImplicitOps | Stack | No64, ImplicitOps | Stack | No64,
6aa8b732 120 /* 0x20 - 0x27 */
d380a5e4 121 ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
6aa8b732 122 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
aa3a816b 123 DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0,
6aa8b732 124 /* 0x28 - 0x2F */
d380a5e4 125 ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
6aa8b732
AK		 126 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
127 0, 0, 0, 0,
128 /* 0x30 - 0x37 */
d380a5e4 129 ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
6aa8b732
AK		 130 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
131 0, 0, 0, 0,
132 /* 0x38 - 0x3F */
133 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
134 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
8a9fee67
GT		 135 ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
136 0, 0,
d77a2507 137 /* 0x40 - 0x47 */
33615aa9 138 DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg,
d77a2507 139 /* 0x48 - 0x4F */
33615aa9 140 DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg,
7f0aaee0 141 /* 0x50 - 0x57 */
6e3d5dfb
AK		 142 SrcReg | Stack, SrcReg | Stack, SrcReg | Stack, SrcReg | Stack,
143 SrcReg | Stack, SrcReg | Stack, SrcReg | Stack, SrcReg | Stack,
7f0aaee0 144 /* 0x58 - 0x5F */
6e3d5dfb
AK		 145 DstReg | Stack, DstReg | Stack, DstReg | Stack, DstReg | Stack,
146 DstReg | Stack, DstReg | Stack, DstReg | Stack, DstReg | Stack,
7d316911 147 /* 0x60 - 0x67 */
abcf14b5
MG		 148 ImplicitOps | Stack | No64, ImplicitOps | Stack | No64,
149 0, DstReg | SrcMem32 | ModRM | Mov /* movsxd (x86/64) */ ,
7d316911
NK		 150 0, 0, 0, 0,
151 /* 0x68 - 0x6F */
91ed7a0e 152 SrcImm | Mov | Stack, 0, SrcImmByte | Mov | Stack, 0,
e70669ab
LV		 153 SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps, /* insb, insw/insd */
154 SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps, /* outsb, outsw/outsd */
55bebde4 155 /* 0x70 - 0x77 */
b2833e3c
GN		 156 SrcImmByte, SrcImmByte, SrcImmByte, SrcImmByte,
157 SrcImmByte, SrcImmByte, SrcImmByte, SrcImmByte,
55bebde4 158 /* 0x78 - 0x7F */
b2833e3c
GN		 159 SrcImmByte, SrcImmByte, SrcImmByte, SrcImmByte,
160 SrcImmByte, SrcImmByte, SrcImmByte, SrcImmByte,
6aa8b732 161 /* 0x80 - 0x87 */
1d6ad207
AK		 162 Group | Group1_80, Group | Group1_81,
163 Group | Group1_82, Group | Group1_83,
6aa8b732 164 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
d380a5e4 165 ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
6aa8b732
AK		 166 /* 0x88 - 0x8F */
167 ByteOp | DstMem | SrcReg | ModRM | Mov, DstMem | SrcReg | ModRM | Mov,
168 ByteOp | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
38d5bc6d 169 DstMem | SrcReg | ModRM | Mov, ModRM | DstReg,
4257198a 170 DstReg | SrcMem | ModRM | Mov, Group | Group1A,
b13354f8
MG		 171 /* 0x90 - 0x97 */
172 DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg,
173 /* 0x98 - 0x9F */
d8769fed 174 0, 0, SrcImm | Src2Imm16 | No64, 0,
0654169e 175 ImplicitOps | Stack, ImplicitOps | Stack, 0, 0,
6aa8b732 176 /* 0xA0 - 0xA7 */
c7e75a3d
AK		 177 ByteOp | DstReg | SrcMem | Mov | MemAbs, DstReg | SrcMem | Mov | MemAbs,
178 ByteOp | DstMem | SrcReg | Mov | MemAbs, DstMem | SrcReg | Mov | MemAbs,
b9fa9d6b
AK		 179 ByteOp | ImplicitOps | Mov | String, ImplicitOps | Mov | String,
180 ByteOp | ImplicitOps | String, ImplicitOps | String,
6aa8b732 181 /* 0xA8 - 0xAF */
b9fa9d6b
AK		 182 0, 0, ByteOp | ImplicitOps | Mov | String, ImplicitOps | Mov | String,
183 ByteOp | ImplicitOps | Mov | String, ImplicitOps | Mov | String,
184 ByteOp | ImplicitOps | String, ImplicitOps | String,
a5e2e82b
MG		 185 /* 0xB0 - 0xB7 */
186 ByteOp | DstReg | SrcImm | Mov, ByteOp | DstReg | SrcImm | Mov,
187 ByteOp | DstReg | SrcImm | Mov, ByteOp | DstReg | SrcImm | Mov,
188 ByteOp | DstReg | SrcImm | Mov, ByteOp | DstReg | SrcImm | Mov,
189 ByteOp | DstReg | SrcImm | Mov, ByteOp | DstReg | SrcImm | Mov,
190 /* 0xB8 - 0xBF */
191 DstReg | SrcImm | Mov, DstReg | SrcImm | Mov,
192 DstReg | SrcImm | Mov, DstReg | SrcImm | Mov,
193 DstReg | SrcImm | Mov, DstReg | SrcImm | Mov,
194 DstReg | SrcImm | Mov, DstReg | SrcImm | Mov,
6aa8b732 195 /* 0xC0 - 0xC7 */
d9413cd7 196 ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImmByte | ModRM,
6e3d5dfb 197 0, ImplicitOps | Stack, 0, 0,
d9413cd7 198 ByteOp | DstMem | SrcImm | ModRM | Mov, DstMem | SrcImm | ModRM | Mov,
6aa8b732 199 /* 0xC8 - 0xCF */
e637b823 200 0, 0, 0, ImplicitOps | Stack,
d8769fed 201 ImplicitOps, SrcImmByte, ImplicitOps | No64, ImplicitOps,
6aa8b732
AK		 202 /* 0xD0 - 0xD7 */
203 ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM,
204 ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM,
205 0, 0, 0, 0,
206 /* 0xD8 - 0xDF */
207 0, 0, 0, 0, 0, 0, 0, 0,
098c937b 208 /* 0xE0 - 0xE7 */
a6a3034c 209 0, 0, 0, 0,
84ce66a6
GN		 210 ByteOp | SrcImmUByte, SrcImmUByte,
211 ByteOp | SrcImmUByte, SrcImmUByte,
098c937b 212 /* 0xE8 - 0xEF */
d53c4777 213 SrcImm | Stack, SrcImm | ImplicitOps,
d8769fed 214 SrcImmU | Src2Imm16 | No64, SrcImmByte | ImplicitOps,
a6a3034c
MG		 215 SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps,
216 SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps,
6aa8b732
AK		 217 /* 0xF0 - 0xF7 */
218 0, 0, 0, 0,
e92805ac 219 ImplicitOps | Priv, ImplicitOps, Group | Group3_Byte, Group | Group3,
6aa8b732 220 /* 0xF8 - 0xFF */
b284be57 221 ImplicitOps, 0, ImplicitOps, ImplicitOps,
fb4616f4 222 ImplicitOps, ImplicitOps, Group | Group4, Group | Group5,
6aa8b732
AK		 223};
224
45ed60b3 225static u32 twobyte_table[256] = {
6aa8b732 226 /* 0x00 - 0x0F */
e92805ac
GN		 227 0, Group | GroupDual | Group7, 0, 0,
228 0, ImplicitOps, ImplicitOps | Priv, 0,
229 ImplicitOps | Priv, ImplicitOps | Priv, 0, 0,
230 0, ImplicitOps | ModRM, 0, 0,
6aa8b732
AK		 231 /* 0x10 - 0x1F */
232 0, 0, 0, 0, 0, 0, 0, 0, ImplicitOps | ModRM, 0, 0, 0, 0, 0, 0, 0,
233 /* 0x20 - 0x2F */
e92805ac
GN		 234 ModRM | ImplicitOps | Priv, ModRM | Priv,
235 ModRM | ImplicitOps | Priv, ModRM | Priv,
236 0, 0, 0, 0,
6aa8b732
AK		 237 0, 0, 0, 0, 0, 0, 0, 0,
238 /* 0x30 - 0x3F */
e92805ac
GN		 239 ImplicitOps | Priv, 0, ImplicitOps | Priv, 0,
240 ImplicitOps, ImplicitOps | Priv, 0, 0,
e99f0507 241 0, 0, 0, 0, 0, 0, 0, 0,
6aa8b732
AK		 242 /* 0x40 - 0x47 */
243 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
244 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
245 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
246 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
247 /* 0x48 - 0x4F */
248 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
249 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
250 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
251 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
252 /* 0x50 - 0x5F */
253 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
254 /* 0x60 - 0x6F */
255 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
256 /* 0x70 - 0x7F */
257 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
258 /* 0x80 - 0x8F */
b2833e3c
GN		 259 SrcImm, SrcImm, SrcImm, SrcImm, SrcImm, SrcImm, SrcImm, SrcImm,
260 SrcImm, SrcImm, SrcImm, SrcImm, SrcImm, SrcImm, SrcImm, SrcImm,
6aa8b732
AK		 261 /* 0x90 - 0x9F */
262 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
263 /* 0xA0 - 0xA7 */
0934ac9d
MG		 264 ImplicitOps | Stack, ImplicitOps | Stack,
265 0, DstMem | SrcReg | ModRM | BitOp,
9bf8ea42
GT		 266 DstMem | SrcReg | Src2ImmByte | ModRM,
267 DstMem | SrcReg | Src2CL | ModRM, 0, 0,
6aa8b732 268 /* 0xA8 - 0xAF */
0934ac9d 269 ImplicitOps | Stack, ImplicitOps | Stack,
d380a5e4 270 0, DstMem | SrcReg | ModRM | BitOp | Lock,
9bf8ea42
GT		 271 DstMem | SrcReg | Src2ImmByte | ModRM,
272 DstMem | SrcReg | Src2CL | ModRM,
273 ModRM, 0,
6aa8b732 274 /* 0xB0 - 0xB7 */
d380a5e4
GN		 275 ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
276 0, DstMem | SrcReg | ModRM | BitOp | Lock,
6aa8b732
AK		 277 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov,
278 DstReg | SrcMem16 | ModRM | Mov,
279 /* 0xB8 - 0xBF */
d380a5e4
GN		 280 0, 0,
281 Group | Group8, DstMem | SrcReg | ModRM | BitOp | Lock,
6aa8b732
AK		 282 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov,
283 DstReg | SrcMem16 | ModRM | Mov,
284 /* 0xC0 - 0xCF */
60a29d4e
GN		 285 0, 0, 0, DstMem | SrcReg | ModRM | Mov,
286 0, 0, 0, Group | GroupDual | Group9,
a012e65a 287 0, 0, 0, 0, 0, 0, 0, 0,
6aa8b732
AK		 288 /* 0xD0 - 0xDF */
289 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
290 /* 0xE0 - 0xEF */
291 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
292 /* 0xF0 - 0xFF */
293 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
294};
295
45ed60b3 296static u32 group_table[] = {
1d6ad207 297 [Group1_80*8] =
d380a5e4
GN		 298 ByteOp | DstMem | SrcImm | ModRM | Lock,
299 ByteOp | DstMem | SrcImm | ModRM | Lock,
300 ByteOp | DstMem | SrcImm | ModRM | Lock,
301 ByteOp | DstMem | SrcImm | ModRM | Lock,
302 ByteOp | DstMem | SrcImm | ModRM | Lock,
303 ByteOp | DstMem | SrcImm | ModRM | Lock,
304 ByteOp | DstMem | SrcImm | ModRM | Lock,
305 ByteOp | DstMem | SrcImm | ModRM,
1d6ad207 306 [Group1_81*8] =
d380a5e4
GN		 307 DstMem | SrcImm | ModRM | Lock,
308 DstMem | SrcImm | ModRM | Lock,
309 DstMem | SrcImm | ModRM | Lock,
310 DstMem | SrcImm | ModRM | Lock,
311 DstMem | SrcImm | ModRM | Lock,
312 DstMem | SrcImm | ModRM | Lock,
313 DstMem | SrcImm | ModRM | Lock,
314 DstMem | SrcImm | ModRM,
1d6ad207 315 [Group1_82*8] =
e424e191
GN		 316 ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
317 ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
318 ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
319 ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
320 ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
321 ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
322 ByteOp | DstMem | SrcImm | ModRM | No64 | Lock,
323 ByteOp | DstMem | SrcImm | ModRM | No64,
1d6ad207 324 [Group1_83*8] =
d380a5e4
GN		 325 DstMem | SrcImmByte | ModRM | Lock,
326 DstMem | SrcImmByte | ModRM | Lock,
327 DstMem | SrcImmByte | ModRM | Lock,
328 DstMem | SrcImmByte | ModRM | Lock,
329 DstMem | SrcImmByte | ModRM | Lock,
330 DstMem | SrcImmByte | ModRM | Lock,
331 DstMem | SrcImmByte | ModRM | Lock,
332 DstMem | SrcImmByte | ModRM,
43bb19cd
AK		 333 [Group1A*8] =
334 DstMem | SrcNone | ModRM | Mov | Stack, 0, 0, 0, 0, 0, 0, 0,
7d858a19
AK		 335 [Group3_Byte*8] =
336 ByteOp | SrcImm | DstMem | ModRM, 0,
337 ByteOp | DstMem | SrcNone | ModRM, ByteOp | DstMem | SrcNone | ModRM,
338 0, 0, 0, 0,
339 [Group3*8] =
41afa025 340 DstMem | SrcImm | ModRM, 0,
6eb06cb2 341 DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM,
7d858a19 342 0, 0, 0, 0,
fd60754e
AK		 343 [Group4*8] =
344 ByteOp | DstMem | SrcNone | ModRM, ByteOp | DstMem | SrcNone | ModRM,
345 0, 0, 0, 0, 0, 0,
346 [Group5*8] =
d19292e4
MG		 347 DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM,
348 SrcMem | ModRM | Stack, 0,
ea79849d
GN		 349 SrcMem | ModRM | Stack, SrcMem | ModRM | Src2Mem16 | ImplicitOps,
350 SrcMem | ModRM | Stack, 0,
d95058a1 351 [Group7*8] =
e92805ac 352 0, 0, ModRM | SrcMem | Priv, ModRM | SrcMem | Priv,
16286d08 353 SrcNone | ModRM | DstMem | Mov, 0,
e92805ac 354 SrcMem16 | ModRM | Mov | Priv, SrcMem | ModRM | ByteOp | Priv,
2db2c2eb
GN		 355 [Group8*8] =
356 0, 0, 0, 0,
d380a5e4
GN		 357 DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM | Lock,
358 DstMem | SrcImmByte | ModRM | Lock, DstMem | SrcImmByte | ModRM | Lock,
60a29d4e 359 [Group9*8] =
d380a5e4 360 0, ImplicitOps | ModRM | Lock, 0, 0, 0, 0, 0, 0,
e09d082c
AK		 361};
362
45ed60b3 363static u32 group2_table[] = {
d95058a1 364 [Group7*8] =
835e6b80 365 SrcNone | ModRM | Priv, 0, 0, SrcNone | ModRM | Priv,
16286d08 366 SrcNone | ModRM | DstMem | Mov, 0,
835e6b80 367 SrcMem16 | ModRM | Mov | Priv, 0,
60a29d4e
GN		 368 [Group9*8] =
369 0, 0, 0, 0, 0, 0, 0, 0,
e09d082c
AK		 370};
371
6aa8b732 372/* EFLAGS bit definitions. */
d4c6a154
GN		 373#define EFLG_ID (1<<21)
374#define EFLG_VIP (1<<20)
375#define EFLG_VIF (1<<19)
376#define EFLG_AC (1<<18)
b1d86143
AP		 377#define EFLG_VM (1<<17)
378#define EFLG_RF (1<<16)
d4c6a154
GN		 379#define EFLG_IOPL (3<<12)
380#define EFLG_NT (1<<14)
6aa8b732
AK		 381#define EFLG_OF (1<<11)
382#define EFLG_DF (1<<10)
b1d86143 383#define EFLG_IF (1<<9)
d4c6a154 384#define EFLG_TF (1<<8)
6aa8b732
AK		 385#define EFLG_SF (1<<7)
386#define EFLG_ZF (1<<6)
387#define EFLG_AF (1<<4)
388#define EFLG_PF (1<<2)
389#define EFLG_CF (1<<0)
390
391/*
392 * Instruction emulation:
393 * Most instructions are emulated directly via a fragment of inline assembly
394 * code. This allows us to save/restore EFLAGS and thus very easily pick up
395 * any modified flags.
396 */
397
05b3e0c2 398#if defined(CONFIG_X86_64)
6aa8b732
AK		 399#define _LO32 "k" /* force 32-bit operand */
400#define _STK "%%rsp" /* stack pointer */
401#elif defined(__i386__)
402#define _LO32 "" /* force 32-bit operand */
403#define _STK "%%esp" /* stack pointer */
404#endif
405
406/*
407 * These EFLAGS bits are restored from saved value during emulation, and
408 * any changes are written back to the saved value after emulation.
409 */
410#define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF)
411
412/* Before executing instruction: restore necessary bits in EFLAGS. */
e934c9c1
AK		 413#define _PRE_EFLAGS(_sav, _msk, _tmp) \
414 /* EFLAGS = (_sav & _msk) | (EFLAGS & ~_msk); _sav &= ~_msk; */ \
415 "movl %"_sav",%"_LO32 _tmp"; " \
416 "push %"_tmp"; " \
417 "push %"_tmp"; " \
418 "movl %"_msk",%"_LO32 _tmp"; " \
419 "andl %"_LO32 _tmp",("_STK"); " \
420 "pushf; " \
421 "notl %"_LO32 _tmp"; " \
422 "andl %"_LO32 _tmp",("_STK"); " \
423 "andl %"_LO32 _tmp","__stringify(BITS_PER_LONG/4)"("_STK"); " \
424 "pop %"_tmp"; " \
425 "orl %"_LO32 _tmp",("_STK"); " \
426 "popf; " \
427 "pop %"_sav"; "
6aa8b732
AK		 428
429/* After executing instruction: write-back necessary bits in EFLAGS. */
430#define _POST_EFLAGS(_sav, _msk, _tmp) \
431 /* _sav |= EFLAGS & _msk; */ \
432 "pushf; " \
433 "pop %"_tmp"; " \
434 "andl %"_msk",%"_LO32 _tmp"; " \
435 "orl %"_LO32 _tmp",%"_sav"; "
436
dda96d8f
AK		 437#ifdef CONFIG_X86_64
438#define ON64(x) x
439#else
440#define ON64(x)
441#endif
442
6b7ad61f
AK		 443#define ____emulate_2op(_op, _src, _dst, _eflags, _x, _y, _suffix) \
444 do { \
445 __asm__ __volatile__ ( \
446 _PRE_EFLAGS("0", "4", "2") \
447 _op _suffix " %"_x"3,%1; " \
448 _POST_EFLAGS("0", "4", "2") \
449 : "=m" (_eflags), "=m" ((_dst).val), \
450 "=&r" (_tmp) \
451 : _y ((_src).val), "i" (EFLAGS_MASK)); \
f3fd92fb 452 } while (0)
6b7ad61f
AK		 453
454
6aa8b732
AK		 455/* Raw emulation: instruction has two explicit operands. */
456#define __emulate_2op_nobyte(_op,_src,_dst,_eflags,_wx,_wy,_lx,_ly,_qx,_qy) \
6b7ad61f
AK		 457 do { \
458 unsigned long _tmp; \
459 \
460 switch ((_dst).bytes) { \
461 case 2: \
462 ____emulate_2op(_op,_src,_dst,_eflags,_wx,_wy,"w"); \
463 break; \
464 case 4: \
465 ____emulate_2op(_op,_src,_dst,_eflags,_lx,_ly,"l"); \
466 break; \
467 case 8: \
468 ON64(____emulate_2op(_op,_src,_dst,_eflags,_qx,_qy,"q")); \
469 break; \
470 } \
6aa8b732
AK		 471 } while (0)
472
473#define __emulate_2op(_op,_src,_dst,_eflags,_bx,_by,_wx,_wy,_lx,_ly,_qx,_qy) \
474 do { \
6b7ad61f 475 unsigned long _tmp; \
d77c26fc 476 switch ((_dst).bytes) { \
6aa8b732 477 case 1: \
6b7ad61f 478 ____emulate_2op(_op,_src,_dst,_eflags,_bx,_by,"b"); \
6aa8b732
AK		 479 break; \
480 default: \
481 __emulate_2op_nobyte(_op, _src, _dst, _eflags, \
482 _wx, _wy, _lx, _ly, _qx, _qy); \
483 break; \
484 } \
485 } while (0)
486
487/* Source operand is byte-sized and may be restricted to just %cl. */
488#define emulate_2op_SrcB(_op, _src, _dst, _eflags) \
489 __emulate_2op(_op, _src, _dst, _eflags, \
490 "b", "c", "b", "c", "b", "c", "b", "c")
491
492/* Source operand is byte, word, long or quad sized. */
493#define emulate_2op_SrcV(_op, _src, _dst, _eflags) \
494 __emulate_2op(_op, _src, _dst, _eflags, \
495 "b", "q", "w", "r", _LO32, "r", "", "r")
496
497/* Source operand is word, long or quad sized. */
498#define emulate_2op_SrcV_nobyte(_op, _src, _dst, _eflags) \
499 __emulate_2op_nobyte(_op, _src, _dst, _eflags, \
500 "w", "r", _LO32, "r", "", "r")
501
d175226a
GT		 502/* Instruction has three operands and one operand is stored in ECX register */
503#define __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, _suffix, _type) \
504 do { \
505 unsigned long _tmp; \
506 _type _clv = (_cl).val; \
507 _type _srcv = (_src).val; \
508 _type _dstv = (_dst).val; \
509 \
510 __asm__ __volatile__ ( \
511 _PRE_EFLAGS("0", "5", "2") \
512 _op _suffix " %4,%1 \n" \
513 _POST_EFLAGS("0", "5", "2") \
514 : "=m" (_eflags), "+r" (_dstv), "=&r" (_tmp) \
515 : "c" (_clv) , "r" (_srcv), "i" (EFLAGS_MASK) \
516 ); \
517 \
518 (_cl).val = (unsigned long) _clv; \
519 (_src).val = (unsigned long) _srcv; \
520 (_dst).val = (unsigned long) _dstv; \
521 } while (0)
522
523#define emulate_2op_cl(_op, _cl, _src, _dst, _eflags) \
524 do { \
525 switch ((_dst).bytes) { \
526 case 2: \
527 __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \
528 "w", unsigned short); \
529 break; \
530 case 4: \
531 __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \
532 "l", unsigned int); \
533 break; \
534 case 8: \
535 ON64(__emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \
536 "q", unsigned long)); \
537 break; \
538 } \
539 } while (0)
540
dda96d8f 541#define __emulate_1op(_op, _dst, _eflags, _suffix) \
6aa8b732
AK		 542 do { \
543 unsigned long _tmp; \
544 \
dda96d8f
AK		 545 __asm__ __volatile__ ( \
546 _PRE_EFLAGS("0", "3", "2") \
547 _op _suffix " %1; " \
548 _POST_EFLAGS("0", "3", "2") \
549 : "=m" (_eflags), "+m" ((_dst).val), \
550 "=&r" (_tmp) \
551 : "i" (EFLAGS_MASK)); \
552 } while (0)
553
554/* Instruction has only one explicit operand (no source operand). */
555#define emulate_1op(_op, _dst, _eflags) \
556 do { \
d77c26fc 557 switch ((_dst).bytes) { \
dda96d8f
AK		 558 case 1: __emulate_1op(_op, _dst, _eflags, "b"); break; \
559 case 2: __emulate_1op(_op, _dst, _eflags, "w"); break; \
560 case 4: __emulate_1op(_op, _dst, _eflags, "l"); break; \
561 case 8: ON64(__emulate_1op(_op, _dst, _eflags, "q")); break; \
6aa8b732
AK		 562 } \
563 } while (0)
564
6aa8b732
AK		 565/* Fetch next part of the instruction being emulated. */
566#define insn_fetch(_type, _size, _eip) \
567({ unsigned long _x; \
62266869 568 rc = do_insn_fetch(ctxt, ops, (_eip), &_x, (_size)); \
d77c26fc 569 if (rc != 0) \
6aa8b732
AK		 570 goto done; \
571 (_eip) += (_size); \
572 (_type)_x; \
573})
574
ddcb2885
HH		 575static inline unsigned long ad_mask(struct decode_cache *c)
576{
577 return (1UL << (c->ad_bytes << 3)) - 1;
578}
579
6aa8b732 580/* Access/update address held in a register, based on addressing mode. */
e4706772
HH		 581static inline unsigned long
582address_mask(struct decode_cache *c, unsigned long reg)
583{
584 if (c->ad_bytes == sizeof(unsigned long))
585 return reg;
586 else
587 return reg & ad_mask(c);
588}
589
590static inline unsigned long
591register_address(struct decode_cache *c, unsigned long base, unsigned long reg)
592{
593 return base + address_mask(c, reg);
594}
595
7a957275
HH		 596static inline void
597register_address_increment(struct decode_cache *c, unsigned long *reg, int inc)
598{
599 if (c->ad_bytes == sizeof(unsigned long))
600 *reg += inc;
601 else
602 *reg = (*reg & ~ad_mask(c)) | ((*reg + inc) & ad_mask(c));
603}
6aa8b732 604
7a957275
HH		 605static inline void jmp_rel(struct decode_cache *c, int rel)
606{
607 register_address_increment(c, &c->eip, rel);
608}
098c937b 609
7a5b56df
AK		 610static void set_seg_override(struct decode_cache *c, int seg)
611{
612 c->has_seg_override = true;
613 c->seg_override = seg;
614}
615
616static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg)
617{
618 if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS)
619 return 0;
620
621 return kvm_x86_ops->get_segment_base(ctxt->vcpu, seg);
622}
623
624static unsigned long seg_override_base(struct x86_emulate_ctxt *ctxt,
625 struct decode_cache *c)
626{
627 if (!c->has_seg_override)
628 return 0;
629
630 return seg_base(ctxt, c->seg_override);
631}
632
633static unsigned long es_base(struct x86_emulate_ctxt *ctxt)
634{
635 return seg_base(ctxt, VCPU_SREG_ES);
636}
637
638static unsigned long ss_base(struct x86_emulate_ctxt *ctxt)
639{
640 return seg_base(ctxt, VCPU_SREG_SS);
641}
642
62266869
AK		 643static int do_fetch_insn_byte(struct x86_emulate_ctxt *ctxt,
644 struct x86_emulate_ops *ops,
645 unsigned long linear, u8 *dest)
646{
647 struct fetch_cache *fc = &ctxt->decode.fetch;
648 int rc;
649 int size;
650
651 if (linear < fc->start || linear >= fc->end) {
652 size = min(15UL, PAGE_SIZE - offset_in_page(linear));
1871c602 653 rc = ops->fetch(linear, fc->data, size, ctxt->vcpu, NULL);
3e2815e9 654 if (rc != X86EMUL_CONTINUE)
62266869
AK		 655 return rc;
656 fc->start = linear;
657 fc->end = linear + size;
658 }
659 *dest = fc->data[linear - fc->start];
3e2815e9 660 return X86EMUL_CONTINUE;
62266869
AK		 661}
662
663static int do_insn_fetch(struct x86_emulate_ctxt *ctxt,
664 struct x86_emulate_ops *ops,
665 unsigned long eip, void *dest, unsigned size)
666{
3e2815e9 667 int rc;
62266869 668
eb3c79e6
AK		 669 /* x86 instructions are limited to 15 bytes. */
670 if (eip + size - ctxt->decode.eip_orig > 15)
671 return X86EMUL_UNHANDLEABLE;
62266869
AK		 672 eip += ctxt->cs_base;
673 while (size--) {
674 rc = do_fetch_insn_byte(ctxt, ops, eip++, dest++);
3e2815e9 675 if (rc != X86EMUL_CONTINUE)
62266869
AK		 676 return rc;
677 }
3e2815e9 678 return X86EMUL_CONTINUE;
62266869
AK		 679}
680
1e3c5cb0
RR		 681/*
682 * Given the 'reg' portion of a ModRM byte, and a register block, return a
683 * pointer into the block that addresses the relevant register.
684 * @highbyte_regs specifies whether to decode AH,CH,DH,BH.
685 */
686static void *decode_register(u8 modrm_reg, unsigned long *regs,
687 int highbyte_regs)
6aa8b732
AK		 688{
689 void *p;
690
691 p = &regs[modrm_reg];
692 if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8)
693 p = (unsigned char *)&regs[modrm_reg & 3] + 1;
694 return p;
695}
696
697static int read_descriptor(struct x86_emulate_ctxt *ctxt,
698 struct x86_emulate_ops *ops,
699 void *ptr,
700 u16 *size, unsigned long *address, int op_bytes)
701{
702 int rc;
703
704 if (op_bytes == 2)
705 op_bytes = 3;
706 *address = 0;
cebff02b 707 rc = ops->read_std((unsigned long)ptr, (unsigned long *)size, 2,
1871c602 708 ctxt->vcpu, NULL);
1b30eaa8 709 if (rc != X86EMUL_CONTINUE)
6aa8b732 710 return rc;
cebff02b 711 rc = ops->read_std((unsigned long)ptr + 2, address, op_bytes,
1871c602 712 ctxt->vcpu, NULL);
6aa8b732
AK		 713 return rc;
714}
715
bbe9abbd
NK		 716static int test_cc(unsigned int condition, unsigned int flags)
717{
718 int rc = 0;
719
720 switch ((condition & 15) >> 1) {
721 case 0: /* o */
722 rc |= (flags & EFLG_OF);
723 break;
724 case 1: /* b/c/nae */
725 rc |= (flags & EFLG_CF);
726 break;
727 case 2: /* z/e */
728 rc |= (flags & EFLG_ZF);
729 break;
730 case 3: /* be/na */
731 rc |= (flags & (EFLG_CF|EFLG_ZF));
732 break;
733 case 4: /* s */
734 rc |= (flags & EFLG_SF);
735 break;
736 case 5: /* p/pe */
737 rc |= (flags & EFLG_PF);
738 break;
739 case 7: /* le/ng */
740 rc |= (flags & EFLG_ZF);
741 /* fall through */
742 case 6: /* l/nge */
743 rc |= (!(flags & EFLG_SF) != !(flags & EFLG_OF));
744 break;
745 }
746
747 /* Odd condition identifiers (lsb == 1) have inverted sense. */
748 return (!!rc ^ (condition & 1));
749}
750
3c118e24
AK		 751static void decode_register_operand(struct operand *op,
752 struct decode_cache *c,
3c118e24
AK		 753 int inhibit_bytereg)
754{
33615aa9 755 unsigned reg = c->modrm_reg;
9f1ef3f8 756 int highbyte_regs = c->rex_prefix == 0;
33615aa9
AK		 757
758 if (!(c->d & ModRM))
759 reg = (c->b & 7) | ((c->rex_prefix & 1) << 3);
3c118e24
AK		 760 op->type = OP_REG;
761 if ((c->d & ByteOp) && !inhibit_bytereg) {
33615aa9 762 op->ptr = decode_register(reg, c->regs, highbyte_regs);
3c118e24
AK		 763 op->val = *(u8 *)op->ptr;
764 op->bytes = 1;
765 } else {
33615aa9 766 op->ptr = decode_register(reg, c->regs, 0);
3c118e24
AK		 767 op->bytes = c->op_bytes;
768 switch (op->bytes) {
769 case 2:
770 op->val = *(u16 *)op->ptr;
771 break;
772 case 4:
773 op->val = *(u32 *)op->ptr;
774 break;
775 case 8:
776 op->val = *(u64 *) op->ptr;
777 break;
778 }
779 }
780 op->orig_val = op->val;
781}
782
1c73ef66
AK		 783static int decode_modrm(struct x86_emulate_ctxt *ctxt,
784 struct x86_emulate_ops *ops)
785{
786 struct decode_cache *c = &ctxt->decode;
787 u8 sib;
f5b4edcd 788 int index_reg = 0, base_reg = 0, scale;
3e2815e9 789 int rc = X86EMUL_CONTINUE;
1c73ef66
AK		 790
791 if (c->rex_prefix) {
792 c->modrm_reg = (c->rex_prefix & 4) << 1; /* REX.R */
793 index_reg = (c->rex_prefix & 2) << 2; /* REX.X */
794 c->modrm_rm = base_reg = (c->rex_prefix & 1) << 3; /* REG.B */
795 }
796
797 c->modrm = insn_fetch(u8, 1, c->eip);
798 c->modrm_mod |= (c->modrm & 0xc0) >> 6;
799 c->modrm_reg |= (c->modrm & 0x38) >> 3;
800 c->modrm_rm |= (c->modrm & 0x07);
801 c->modrm_ea = 0;
802 c->use_modrm_ea = 1;
803
804 if (c->modrm_mod == 3) {
107d6d2e
AK		 805 c->modrm_ptr = decode_register(c->modrm_rm,
806 c->regs, c->d & ByteOp);
807 c->modrm_val = *(unsigned long *)c->modrm_ptr;
1c73ef66
AK		 808 return rc;
809 }
810
811 if (c->ad_bytes == 2) {
812 unsigned bx = c->regs[VCPU_REGS_RBX];
813 unsigned bp = c->regs[VCPU_REGS_RBP];
814 unsigned si = c->regs[VCPU_REGS_RSI];
815 unsigned di = c->regs[VCPU_REGS_RDI];
816
817 /* 16-bit ModR/M decode. */
818 switch (c->modrm_mod) {
819 case 0:
820 if (c->modrm_rm == 6)
821 c->modrm_ea += insn_fetch(u16, 2, c->eip);
822 break;
823 case 1:
824 c->modrm_ea += insn_fetch(s8, 1, c->eip);
825 break;
826 case 2:
827 c->modrm_ea += insn_fetch(u16, 2, c->eip);
828 break;
829 }
830 switch (c->modrm_rm) {
831 case 0:
832 c->modrm_ea += bx + si;
833 break;
834 case 1:
835 c->modrm_ea += bx + di;
836 break;
837 case 2:
838 c->modrm_ea += bp + si;
839 break;
840 case 3:
841 c->modrm_ea += bp + di;
842 break;
843 case 4:
844 c->modrm_ea += si;
845 break;
846 case 5:
847 c->modrm_ea += di;
848 break;
849 case 6:
850 if (c->modrm_mod != 0)
851 c->modrm_ea += bp;
852 break;
853 case 7:
854 c->modrm_ea += bx;
855 break;
856 }
857 if (c->modrm_rm == 2 || c->modrm_rm == 3 ||
858 (c->modrm_rm == 6 && c->modrm_mod != 0))
7a5b56df
AK		 859 if (!c->has_seg_override)
860 set_seg_override(c, VCPU_SREG_SS);
1c73ef66
AK		 861 c->modrm_ea = (u16)c->modrm_ea;
862 } else {
863 /* 32/64-bit ModR/M decode. */
84411d85 864 if ((c->modrm_rm & 7) == 4) {
1c73ef66
AK		 865 sib = insn_fetch(u8, 1, c->eip);
866 index_reg |= (sib >> 3) & 7;
867 base_reg |= sib & 7;
868 scale = sib >> 6;
869
dc71d0f1
AK		 870 if ((base_reg & 7) == 5 && c->modrm_mod == 0)
871 c->modrm_ea += insn_fetch(s32, 4, c->eip);
872 else
1c73ef66 873 c->modrm_ea += c->regs[base_reg];
dc71d0f1 874 if (index_reg != 4)
1c73ef66 875 c->modrm_ea += c->regs[index_reg] << scale;
84411d85
AK		 876 } else if ((c->modrm_rm & 7) == 5 && c->modrm_mod == 0) {
877 if (ctxt->mode == X86EMUL_MODE_PROT64)
f5b4edcd 878 c->rip_relative = 1;
84411d85 879 } else
1c73ef66 880 c->modrm_ea += c->regs[c->modrm_rm];
1c73ef66
AK		 881 switch (c->modrm_mod) {
882 case 0:
883 if (c->modrm_rm == 5)
884 c->modrm_ea += insn_fetch(s32, 4, c->eip);
885 break;
886 case 1:
887 c->modrm_ea += insn_fetch(s8, 1, c->eip);
888 break;
889 case 2:
890 c->modrm_ea += insn_fetch(s32, 4, c->eip);
891 break;
892 }
893 }
1c73ef66
AK		 894done:
895 return rc;
896}
897
898static int decode_abs(struct x86_emulate_ctxt *ctxt,
899 struct x86_emulate_ops *ops)
900{
901 struct decode_cache *c = &ctxt->decode;
3e2815e9 902 int rc = X86EMUL_CONTINUE;
1c73ef66
AK		 903
904 switch (c->ad_bytes) {
905 case 2:
906 c->modrm_ea = insn_fetch(u16, 2, c->eip);
907 break;
908 case 4:
909 c->modrm_ea = insn_fetch(u32, 4, c->eip);
910 break;
911 case 8:
912 c->modrm_ea = insn_fetch(u64, 8, c->eip);
913 break;
914 }
915done:
916 return rc;
917}
918
6aa8b732 919int
8b4caf66 920x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
6aa8b732 921{
e4e03ded 922 struct decode_cache *c = &ctxt->decode;
3e2815e9 923 int rc = X86EMUL_CONTINUE;
6aa8b732 924 int mode = ctxt->mode;
e09d082c 925 int def_op_bytes, def_ad_bytes, group;
6aa8b732
AK		 926
927 /* Shadow copy of register state. Committed on successful emulation. */
6aa8b732 928
e4e03ded 929 memset(c, 0, sizeof(struct decode_cache));
eb3c79e6 930 c->eip = c->eip_orig = kvm_rip_read(ctxt->vcpu);
7a5b56df 931 ctxt->cs_base = seg_base(ctxt, VCPU_SREG_CS);
ad312c7c 932 memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs);
6aa8b732
AK		 933
934 switch (mode) {
935 case X86EMUL_MODE_REAL:
a0044755 936 case X86EMUL_MODE_VM86:
6aa8b732 937 case X86EMUL_MODE_PROT16:
f21b8bf4 938 def_op_bytes = def_ad_bytes = 2;
6aa8b732
AK		 939 break;
940 case X86EMUL_MODE_PROT32:
f21b8bf4 941 def_op_bytes = def_ad_bytes = 4;
6aa8b732 942 break;
05b3e0c2 943#ifdef CONFIG_X86_64
6aa8b732 944 case X86EMUL_MODE_PROT64:
f21b8bf4
AK		 945 def_op_bytes = 4;
946 def_ad_bytes = 8;
6aa8b732
AK		 947 break;
948#endif
949 default:
950 return -1;
951 }
952
f21b8bf4
AK		 953 c->op_bytes = def_op_bytes;
954 c->ad_bytes = def_ad_bytes;
955
6aa8b732 956 /* Legacy prefixes. */
b4c6abfe 957 for (;;) {
e4e03ded 958 switch (c->b = insn_fetch(u8, 1, c->eip)) {
6aa8b732 959 case 0x66: /* operand-size override */
f21b8bf4
AK		 960 /* switch between 2/4 bytes */
961 c->op_bytes = def_op_bytes ^ 6;
6aa8b732
AK		 962 break;
963 case 0x67: /* address-size override */
964 if (mode == X86EMUL_MODE_PROT64)
e4e03ded 965 /* switch between 4/8 bytes */
f21b8bf4 966 c->ad_bytes = def_ad_bytes ^ 12;
6aa8b732 967 else
e4e03ded 968 /* switch between 2/4 bytes */
f21b8bf4 969 c->ad_bytes = def_ad_bytes ^ 6;
6aa8b732 970 break;
7a5b56df 971 case 0x26: /* ES override */
6aa8b732 972 case 0x2e: /* CS override */
7a5b56df 973 case 0x36: /* SS override */
6aa8b732 974 case 0x3e: /* DS override */
7a5b56df 975 set_seg_override(c, (c->b >> 3) & 3);
6aa8b732
AK		 976 break;
977 case 0x64: /* FS override */
6aa8b732 978 case 0x65: /* GS override */
7a5b56df 979 set_seg_override(c, c->b & 7);
6aa8b732 980 break;
b4c6abfe
LV		 981 case 0x40 ... 0x4f: /* REX */
982 if (mode != X86EMUL_MODE_PROT64)
983 goto done_prefixes;
33615aa9 984 c->rex_prefix = c->b;
b4c6abfe 985 continue;
6aa8b732 986 case 0xf0: /* LOCK */
e4e03ded 987 c->lock_prefix = 1;
6aa8b732 988 break;
ae6200ba 989 case 0xf2: /* REPNE/REPNZ */
90e0a28f
GT		 990 c->rep_prefix = REPNE_PREFIX;
991 break;
6aa8b732 992 case 0xf3: /* REP/REPE/REPZ */
90e0a28f 993 c->rep_prefix = REPE_PREFIX;
6aa8b732 994 break;
6aa8b732
AK		 995 default:
996 goto done_prefixes;
997 }
b4c6abfe
LV		 998
999 /* Any legacy prefix after a REX prefix nullifies its effect. */
1000
33615aa9 1001 c->rex_prefix = 0;
6aa8b732
AK		 1002 }
1003
1004done_prefixes:
1005
1006 /* REX prefix. */
1c73ef66 1007 if (c->rex_prefix)
33615aa9 1008 if (c->rex_prefix & 8)
e4e03ded 1009 c->op_bytes = 8; /* REX.W */
6aa8b732
AK		 1010
1011 /* Opcode byte(s). */
e4e03ded
LV		 1012 c->d = opcode_table[c->b];
1013 if (c->d == 0) {
6aa8b732 1014 /* Two-byte opcode? */
e4e03ded
LV		 1015 if (c->b == 0x0f) {
1016 c->twobyte = 1;
1017 c->b = insn_fetch(u8, 1, c->eip);
1018 c->d = twobyte_table[c->b];
6aa8b732 1019 }
e09d082c 1020 }
6aa8b732 1021
e09d082c
AK		 1022 if (c->d & Group) {
1023 group = c->d & GroupMask;
1024 c->modrm = insn_fetch(u8, 1, c->eip);
1025 --c->eip;
1026
1027 group = (group << 3) + ((c->modrm >> 3) & 7);
1028 if ((c->d & GroupDual) && (c->modrm >> 6) == 3)
1029 c->d = group2_table[group];
1030 else
1031 c->d = group_table[group];
1032 }
1033
1034 /* Unrecognised? */
1035 if (c->d == 0) {
1036 DPRINTF("Cannot emulate %02x\n", c->b);
1037 return -1;
6aa8b732
AK		 1038 }
1039
6e3d5dfb
AK		 1040 if (mode == X86EMUL_MODE_PROT64 && (c->d & Stack))
1041 c->op_bytes = 8;
1042
6aa8b732 1043 /* ModRM and SIB bytes. */
1c73ef66
AK		 1044 if (c->d & ModRM)
1045 rc = decode_modrm(ctxt, ops);
1046 else if (c->d & MemAbs)
1047 rc = decode_abs(ctxt, ops);
3e2815e9 1048 if (rc != X86EMUL_CONTINUE)
1c73ef66 1049 goto done;
6aa8b732 1050
7a5b56df
AK		 1051 if (!c->has_seg_override)
1052 set_seg_override(c, VCPU_SREG_DS);
c7e75a3d 1053
7a5b56df
AK		 1054 if (!(!c->twobyte && c->b == 0x8d))
1055 c->modrm_ea += seg_override_base(ctxt, c);
c7e75a3d
AK		 1056
1057 if (c->ad_bytes != 8)
1058 c->modrm_ea = (u32)c->modrm_ea;
6aa8b732
AK		 1059 /*
1060 * Decode and fetch the source operand: register, memory
1061 * or immediate.
1062 */
e4e03ded 1063 switch (c->d & SrcMask) {
6aa8b732
AK		 1064 case SrcNone:
1065 break;
1066 case SrcReg:
9f1ef3f8 1067 decode_register_operand(&c->src, c, 0);
6aa8b732
AK		 1068 break;
1069 case SrcMem16:
e4e03ded 1070 c->src.bytes = 2;
6aa8b732
AK		 1071 goto srcmem_common;
1072 case SrcMem32:
e4e03ded 1073 c->src.bytes = 4;
6aa8b732
AK		 1074 goto srcmem_common;
1075 case SrcMem:
e4e03ded
LV		 1076 c->src.bytes = (c->d & ByteOp) ? 1 :
1077 c->op_bytes;
b85b9ee9 1078 /* Don't fetch the address for invlpg: it could be unmapped. */
d77c26fc 1079 if (c->twobyte && c->b == 0x01 && c->modrm_reg == 7)
b85b9ee9 1080 break;
d77c26fc 1081 srcmem_common:
4e62417b
AJ		 1082 /*
1083 * For instructions with a ModR/M byte, switch to register
1084 * access if Mod = 3.
1085 */
e4e03ded
LV		 1086 if ((c->d & ModRM) && c->modrm_mod == 3) {
1087 c->src.type = OP_REG;
66b85505 1088 c->src.val = c->modrm_val;
107d6d2e 1089 c->src.ptr = c->modrm_ptr;
4e62417b
AJ		 1090 break;
1091 }
e4e03ded 1092 c->src.type = OP_MEM;
6aa8b732
AK		 1093 break;
1094 case SrcImm:
c9eaf20f 1095 case SrcImmU:
e4e03ded
LV		 1096 c->src.type = OP_IMM;
1097 c->src.ptr = (unsigned long *)c->eip;
1098 c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
1099 if (c->src.bytes == 8)
1100 c->src.bytes = 4;
6aa8b732 1101 /* NB. Immediates are sign-extended as necessary. */
e4e03ded 1102 switch (c->src.bytes) {
6aa8b732 1103 case 1:
e4e03ded 1104 c->src.val = insn_fetch(s8, 1, c->eip);
6aa8b732
AK		 1105 break;
1106 case 2:
e4e03ded 1107 c->src.val = insn_fetch(s16, 2, c->eip);
6aa8b732
AK		 1108 break;
1109 case 4:
e4e03ded 1110 c->src.val = insn_fetch(s32, 4, c->eip);
6aa8b732
AK		 1111 break;
1112 }
c9eaf20f
AK		 1113 if ((c->d & SrcMask) == SrcImmU) {
1114 switch (c->src.bytes) {
1115 case 1:
1116 c->src.val &= 0xff;
1117 break;
1118 case 2:
1119 c->src.val &= 0xffff;
1120 break;
1121 case 4:
1122 c->src.val &= 0xffffffff;
1123 break;
1124 }
1125 }
6aa8b732
AK		 1126 break;
1127 case SrcImmByte:
341de7e3 1128 case SrcImmUByte:
e4e03ded
LV		 1129 c->src.type = OP_IMM;
1130 c->src.ptr = (unsigned long *)c->eip;
1131 c->src.bytes = 1;
341de7e3
GN		 1132 if ((c->d & SrcMask) == SrcImmByte)
1133 c->src.val = insn_fetch(s8, 1, c->eip);
1134 else
1135 c->src.val = insn_fetch(u8, 1, c->eip);
6aa8b732 1136 break;
bfcadf83
GT		 1137 case SrcOne:
1138 c->src.bytes = 1;
1139 c->src.val = 1;
1140 break;
6aa8b732
AK		 1141 }
1142
0dc8d10f
GT		 1143 /*
1144 * Decode and fetch the second source operand: register, memory
1145 * or immediate.
1146 */
1147 switch (c->d & Src2Mask) {
1148 case Src2None:
1149 break;
1150 case Src2CL:
1151 c->src2.bytes = 1;
1152 c->src2.val = c->regs[VCPU_REGS_RCX] & 0x8;
1153 break;
1154 case Src2ImmByte:
1155 c->src2.type = OP_IMM;
1156 c->src2.ptr = (unsigned long *)c->eip;
1157 c->src2.bytes = 1;
1158 c->src2.val = insn_fetch(u8, 1, c->eip);
1159 break;
a5f868bd
GN		 1160 case Src2Imm16:
1161 c->src2.type = OP_IMM;
1162 c->src2.ptr = (unsigned long *)c->eip;
1163 c->src2.bytes = 2;
1164 c->src2.val = insn_fetch(u16, 2, c->eip);
1165 break;
0dc8d10f
GT		 1166 case Src2One:
1167 c->src2.bytes = 1;
1168 c->src2.val = 1;
1169 break;
e35b7b9c
GN		 1170 case Src2Mem16:
1171 c->src2.bytes = 2;
1172 c->src2.type = OP_MEM;
1173 break;
0dc8d10f
GT		 1174 }
1175
038e51de 1176 /* Decode and fetch the destination operand: register or memory. */
e4e03ded 1177 switch (c->d & DstMask) {
038e51de
AK		 1178 case ImplicitOps:
1179 /* Special instructions do their own operand decoding. */
8b4caf66 1180 return 0;
038e51de 1181 case DstReg:
9f1ef3f8 1182 decode_register_operand(&c->dst, c,
3c118e24 1183 c->twobyte && (c->b == 0xb6 || c->b == 0xb7));
038e51de
AK		 1184 break;
1185 case DstMem:
e4e03ded 1186 if ((c->d & ModRM) && c->modrm_mod == 3) {
89c69638 1187 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
e4e03ded 1188 c->dst.type = OP_REG;
66b85505 1189 c->dst.val = c->dst.orig_val = c->modrm_val;
107d6d2e 1190 c->dst.ptr = c->modrm_ptr;
4e62417b
AJ		 1191 break;
1192 }
8b4caf66
LV		 1193 c->dst.type = OP_MEM;
1194 break;
9c9fddd0
GT		 1195 case DstAcc:
1196 c->dst.type = OP_REG;
1197 c->dst.bytes = c->op_bytes;
1198 c->dst.ptr = &c->regs[VCPU_REGS_RAX];
1199 switch (c->op_bytes) {
1200 case 1:
1201 c->dst.val = *(u8 *)c->dst.ptr;
1202 break;
1203 case 2:
1204 c->dst.val = *(u16 *)c->dst.ptr;
1205 break;
1206 case 4:
1207 c->dst.val = *(u32 *)c->dst.ptr;
1208 break;
1209 }
1210 c->dst.orig_val = c->dst.val;
1211 break;
8b4caf66
LV		 1212 }
1213
f5b4edcd
AK		 1214 if (c->rip_relative)
1215 c->modrm_ea += c->eip;
1216
8b4caf66
LV		 1217done:
1218 return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0;
1219}
1220
8cdbd2c9
LV		 1221static inline void emulate_push(struct x86_emulate_ctxt *ctxt)
1222{
1223 struct decode_cache *c = &ctxt->decode;
1224
1225 c->dst.type = OP_MEM;
1226 c->dst.bytes = c->op_bytes;
1227 c->dst.val = c->src.val;
7a957275 1228 register_address_increment(c, &c->regs[VCPU_REGS_RSP], -c->op_bytes);
7a5b56df 1229 c->dst.ptr = (void *) register_address(c, ss_base(ctxt),
8cdbd2c9
LV		 1230 c->regs[VCPU_REGS_RSP]);
1231}
1232
faa5a3ae 1233static int emulate_pop(struct x86_emulate_ctxt *ctxt,
350f69dc
AK		 1234 struct x86_emulate_ops *ops,
1235 void *dest, int len)
8cdbd2c9
LV		 1236{
1237 struct decode_cache *c = &ctxt->decode;
1238 int rc;
1239
781d0edc
AK		 1240 rc = ops->read_emulated(register_address(c, ss_base(ctxt),
1241 c->regs[VCPU_REGS_RSP]),
350f69dc 1242 dest, len, ctxt->vcpu);
b60d513c 1243 if (rc != X86EMUL_CONTINUE)
8cdbd2c9
LV		 1244 return rc;
1245
350f69dc 1246 register_address_increment(c, &c->regs[VCPU_REGS_RSP], len);
faa5a3ae
AK		 1247 return rc;
1248}
8cdbd2c9 1249
d4c6a154
GN		 1250static int emulate_popf(struct x86_emulate_ctxt *ctxt,
1251 struct x86_emulate_ops *ops,
1252 void *dest, int len)
1253{
1254 int rc;
1255 unsigned long val, change_mask;
1256 int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
1257 int cpl = kvm_x86_ops->get_cpl(ctxt->vcpu);
1258
1259 rc = emulate_pop(ctxt, ops, &val, len);
1260 if (rc != X86EMUL_CONTINUE)
1261 return rc;
1262
1263 change_mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_OF
1264 | EFLG_TF | EFLG_DF | EFLG_NT | EFLG_RF | EFLG_AC | EFLG_ID;
1265
1266 switch(ctxt->mode) {
1267 case X86EMUL_MODE_PROT64:
1268 case X86EMUL_MODE_PROT32:
1269 case X86EMUL_MODE_PROT16:
1270 if (cpl == 0)
1271 change_mask |= EFLG_IOPL;
1272 if (cpl <= iopl)
1273 change_mask |= EFLG_IF;
1274 break;
1275 case X86EMUL_MODE_VM86:
1276 if (iopl < 3) {
1277 kvm_inject_gp(ctxt->vcpu, 0);
1278 return X86EMUL_PROPAGATE_FAULT;
1279 }
1280 change_mask |= EFLG_IF;
1281 break;
1282 default: /* real mode */
1283 change_mask |= (EFLG_IOPL | EFLG_IF);
1284 break;
1285 }
1286
1287 *(unsigned long *)dest =
1288 (ctxt->eflags & ~change_mask) | (val & change_mask);
1289
1290 return rc;
1291}
1292
0934ac9d
MG		 1293static void emulate_push_sreg(struct x86_emulate_ctxt *ctxt, int seg)
1294{
1295 struct decode_cache *c = &ctxt->decode;
1296 struct kvm_segment segment;
1297
1298 kvm_x86_ops->get_segment(ctxt->vcpu, &segment, seg);
1299
1300 c->src.val = segment.selector;
1301 emulate_push(ctxt);
1302}
1303
1304static int emulate_pop_sreg(struct x86_emulate_ctxt *ctxt,
1305 struct x86_emulate_ops *ops, int seg)
1306{
1307 struct decode_cache *c = &ctxt->decode;
1308 unsigned long selector;
1309 int rc;
1310
1311 rc = emulate_pop(ctxt, ops, &selector, c->op_bytes);
1b30eaa8 1312 if (rc != X86EMUL_CONTINUE)
0934ac9d
MG		 1313 return rc;
1314
c697518a 1315 rc = kvm_load_segment_descriptor(ctxt->vcpu, (u16)selector, seg);
0934ac9d
MG		 1316 return rc;
1317}
1318
abcf14b5
MG		 1319static void emulate_pusha(struct x86_emulate_ctxt *ctxt)
1320{
1321 struct decode_cache *c = &ctxt->decode;
1322 unsigned long old_esp = c->regs[VCPU_REGS_RSP];
1323 int reg = VCPU_REGS_RAX;
1324
1325 while (reg <= VCPU_REGS_RDI) {
1326 (reg == VCPU_REGS_RSP) ?
1327 (c->src.val = old_esp) : (c->src.val = c->regs[reg]);
1328
1329 emulate_push(ctxt);
1330 ++reg;
1331 }
1332}
1333
1334static int emulate_popa(struct x86_emulate_ctxt *ctxt,
1335 struct x86_emulate_ops *ops)
1336{
1337 struct decode_cache *c = &ctxt->decode;
1b30eaa8 1338 int rc = X86EMUL_CONTINUE;
abcf14b5
MG		 1339 int reg = VCPU_REGS_RDI;
1340
1341 while (reg >= VCPU_REGS_RAX) {
1342 if (reg == VCPU_REGS_RSP) {
1343 register_address_increment(c, &c->regs[VCPU_REGS_RSP],
1344 c->op_bytes);
1345 --reg;
1346 }
1347
1348 rc = emulate_pop(ctxt, ops, &c->regs[reg], c->op_bytes);
1b30eaa8 1349 if (rc != X86EMUL_CONTINUE)
abcf14b5
MG		 1350 break;
1351 --reg;
1352 }
1353 return rc;
1354}
1355
faa5a3ae
AK		 1356static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt,
1357 struct x86_emulate_ops *ops)
1358{
1359 struct decode_cache *c = &ctxt->decode;
faa5a3ae 1360
1b30eaa8 1361 return emulate_pop(ctxt, ops, &c->dst.val, c->dst.bytes);
8cdbd2c9
LV		 1362}
1363
05f086f8 1364static inline void emulate_grp2(struct x86_emulate_ctxt *ctxt)
8cdbd2c9 1365{
05f086f8 1366 struct decode_cache *c = &ctxt->decode;
8cdbd2c9
LV		 1367 switch (c->modrm_reg) {
1368 case 0: /* rol */
05f086f8 1369 emulate_2op_SrcB("rol", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1370 break;
1371 case 1: /* ror */
05f086f8 1372 emulate_2op_SrcB("ror", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1373 break;
1374 case 2: /* rcl */
05f086f8 1375 emulate_2op_SrcB("rcl", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1376 break;
1377 case 3: /* rcr */
05f086f8 1378 emulate_2op_SrcB("rcr", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1379 break;
1380 case 4: /* sal/shl */
1381 case 6: /* sal/shl */
05f086f8 1382 emulate_2op_SrcB("sal", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1383 break;
1384 case 5: /* shr */
05f086f8 1385 emulate_2op_SrcB("shr", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1386 break;
1387 case 7: /* sar */
05f086f8 1388 emulate_2op_SrcB("sar", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1389 break;
1390 }
1391}
1392
1393static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
05f086f8 1394 struct x86_emulate_ops *ops)
8cdbd2c9
LV		 1395{
1396 struct decode_cache *c = &ctxt->decode;
1b30eaa8 1397 int rc = X86EMUL_CONTINUE;
8cdbd2c9
LV		 1398
1399 switch (c->modrm_reg) {
1400 case 0 ... 1: /* test */
05f086f8 1401 emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1402 break;
1403 case 2: /* not */
1404 c->dst.val = ~c->dst.val;
1405 break;
1406 case 3: /* neg */
05f086f8 1407 emulate_1op("neg", c->dst, ctxt->eflags);
8cdbd2c9
LV		 1408 break;
1409 default:
1410 DPRINTF("Cannot emulate %02x\n", c->b);
1411 rc = X86EMUL_UNHANDLEABLE;
1412 break;
1413 }
8cdbd2c9
LV		 1414 return rc;
1415}
1416
1417static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
a01af5ec 1418 struct x86_emulate_ops *ops)
8cdbd2c9
LV		 1419{
1420 struct decode_cache *c = &ctxt->decode;
8cdbd2c9
LV		 1421
1422 switch (c->modrm_reg) {
1423 case 0: /* inc */
05f086f8 1424 emulate_1op("inc", c->dst, ctxt->eflags);
8cdbd2c9
LV		 1425 break;
1426 case 1: /* dec */
05f086f8 1427 emulate_1op("dec", c->dst, ctxt->eflags);
8cdbd2c9 1428 break;
d19292e4
MG		 1429 case 2: /* call near abs */ {
1430 long int old_eip;
1431 old_eip = c->eip;
1432 c->eip = c->src.val;
1433 c->src.val = old_eip;
1434 emulate_push(ctxt);
1435 break;
1436 }
8cdbd2c9 1437 case 4: /* jmp abs */
fd60754e 1438 c->eip = c->src.val;
8cdbd2c9
LV		 1439 break;
1440 case 6: /* push */
fd60754e 1441 emulate_push(ctxt);
8cdbd2c9 1442 break;
8cdbd2c9 1443 }
1b30eaa8 1444 return X86EMUL_CONTINUE;
8cdbd2c9
LV		 1445}
1446
1447static inline int emulate_grp9(struct x86_emulate_ctxt *ctxt,
1448 struct x86_emulate_ops *ops,
e8d8d7fe 1449 unsigned long memop)
8cdbd2c9
LV		 1450{
1451 struct decode_cache *c = &ctxt->decode;
1452 u64 old, new;
1453 int rc;
1454
e8d8d7fe 1455 rc = ops->read_emulated(memop, &old, 8, ctxt->vcpu);
b60d513c 1456 if (rc != X86EMUL_CONTINUE)
8cdbd2c9
LV		 1457 return rc;
1458
1459 if (((u32) (old >> 0) != (u32) c->regs[VCPU_REGS_RAX]) ||
1460 ((u32) (old >> 32) != (u32) c->regs[VCPU_REGS_RDX])) {
1461
1462 c->regs[VCPU_REGS_RAX] = (u32) (old >> 0);
1463 c->regs[VCPU_REGS_RDX] = (u32) (old >> 32);
05f086f8 1464 ctxt->eflags &= ~EFLG_ZF;
8cdbd2c9
LV		 1465
1466 } else {
1467 new = ((u64)c->regs[VCPU_REGS_RCX] << 32) |
1468 (u32) c->regs[VCPU_REGS_RBX];
1469
e8d8d7fe 1470 rc = ops->cmpxchg_emulated(memop, &old, &new, 8, ctxt->vcpu);
b60d513c 1471 if (rc != X86EMUL_CONTINUE)
8cdbd2c9 1472 return rc;
05f086f8 1473 ctxt->eflags |= EFLG_ZF;
8cdbd2c9 1474 }
1b30eaa8 1475 return X86EMUL_CONTINUE;
8cdbd2c9
LV		 1476}
1477
a77ab5ea
AK		 1478static int emulate_ret_far(struct x86_emulate_ctxt *ctxt,
1479 struct x86_emulate_ops *ops)
1480{
1481 struct decode_cache *c = &ctxt->decode;
1482 int rc;
1483 unsigned long cs;
1484
1485 rc = emulate_pop(ctxt, ops, &c->eip, c->op_bytes);
1b30eaa8 1486 if (rc != X86EMUL_CONTINUE)
a77ab5ea
AK		 1487 return rc;
1488 if (c->op_bytes == 4)
1489 c->eip = (u32)c->eip;
1490 rc = emulate_pop(ctxt, ops, &cs, c->op_bytes);
1b30eaa8 1491 if (rc != X86EMUL_CONTINUE)
a77ab5ea 1492 return rc;
c697518a 1493 rc = kvm_load_segment_descriptor(ctxt->vcpu, (u16)cs, VCPU_SREG_CS);
a77ab5ea
AK		 1494 return rc;
1495}
1496
8cdbd2c9
LV		 1497static inline int writeback(struct x86_emulate_ctxt *ctxt,
1498 struct x86_emulate_ops *ops)
1499{
1500 int rc;
1501 struct decode_cache *c = &ctxt->decode;
1502
1503 switch (c->dst.type) {
1504 case OP_REG:
1505 /* The 4-byte case *is* correct:
1506 * in 64-bit mode we zero-extend.
1507 */
1508 switch (c->dst.bytes) {
1509 case 1:
1510 *(u8 *)c->dst.ptr = (u8)c->dst.val;
1511 break;
1512 case 2:
1513 *(u16 *)c->dst.ptr = (u16)c->dst.val;
1514 break;
1515 case 4:
1516 *c->dst.ptr = (u32)c->dst.val;
1517 break; /* 64b: zero-ext */
1518 case 8:
1519 *c->dst.ptr = c->dst.val;
1520 break;
1521 }
1522 break;
1523 case OP_MEM:
1524 if (c->lock_prefix)
1525 rc = ops->cmpxchg_emulated(
1526 (unsigned long)c->dst.ptr,
1527 &c->dst.orig_val,
1528 &c->dst.val,
1529 c->dst.bytes,
1530 ctxt->vcpu);
1531 else
1532 rc = ops->write_emulated(
1533 (unsigned long)c->dst.ptr,
1534 &c->dst.val,
1535 c->dst.bytes,
1536 ctxt->vcpu);
b60d513c 1537 if (rc != X86EMUL_CONTINUE)
8cdbd2c9 1538 return rc;
a01af5ec
LV		 1539 break;
1540 case OP_NONE:
1541 /* no writeback */
1542 break;
8cdbd2c9
LV		 1543 default:
1544 break;
1545 }
1b30eaa8 1546 return X86EMUL_CONTINUE;
8cdbd2c9
LV		 1547}
1548
a3f9d398 1549static void toggle_interruptibility(struct x86_emulate_ctxt *ctxt, u32 mask)
310b5d30
GC		 1550{
1551 u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(ctxt->vcpu, mask);
1552 /*
1553 * an sti; sti; sequence only disable interrupts for the first
1554 * instruction. So, if the last instruction, be it emulated or
1555 * not, left the system with the INT_STI flag enabled, it
1556 * means that the last instruction is an sti. We should not
1557 * leave the flag on in this case. The same goes for mov ss
1558 */
1559 if (!(int_shadow & mask))
1560 ctxt->interruptibility = mask;
1561}
1562
e66bb2cc
AP		 1563static inline void
1564setup_syscalls_segments(struct x86_emulate_ctxt *ctxt,
1565 struct kvm_segment *cs, struct kvm_segment *ss)
1566{
1567 memset(cs, 0, sizeof(struct kvm_segment));
1568 kvm_x86_ops->get_segment(ctxt->vcpu, cs, VCPU_SREG_CS);
1569 memset(ss, 0, sizeof(struct kvm_segment));
1570
1571 cs->l = 0; /* will be adjusted later */
1572 cs->base = 0; /* flat segment */
1573 cs->g = 1; /* 4kb granularity */
1574 cs->limit = 0xffffffff; /* 4GB limit */
1575 cs->type = 0x0b; /* Read, Execute, Accessed */
1576 cs->s = 1;
1577 cs->dpl = 0; /* will be adjusted later */
1578 cs->present = 1;
1579 cs->db = 1;
1580
1581 ss->unusable = 0;
1582 ss->base = 0; /* flat segment */
1583 ss->limit = 0xffffffff; /* 4GB limit */
1584 ss->g = 1; /* 4kb granularity */
1585 ss->s = 1;
1586 ss->type = 0x03; /* Read/Write, Accessed */
1587 ss->db = 1; /* 32bit stack segment */
1588 ss->dpl = 0;
1589 ss->present = 1;
1590}
1591
1592static int
1593emulate_syscall(struct x86_emulate_ctxt *ctxt)
1594{
1595 struct decode_cache *c = &ctxt->decode;
1596 struct kvm_segment cs, ss;
1597 u64 msr_data;
1598
1599 /* syscall is not available in real mode */
d380a5e4 1600 if (ctxt->mode == X86EMUL_MODE_REAL || ctxt->mode == X86EMUL_MODE_VM86)
e54cfa97 1601 return X86EMUL_UNHANDLEABLE;
e66bb2cc
AP		 1602
1603 setup_syscalls_segments(ctxt, &cs, &ss);
1604
1605 kvm_x86_ops->get_msr(ctxt->vcpu, MSR_STAR, &msr_data);
1606 msr_data >>= 32;
1607 cs.selector = (u16)(msr_data & 0xfffc);
1608 ss.selector = (u16)(msr_data + 8);
1609
1610 if (is_long_mode(ctxt->vcpu)) {
1611 cs.db = 0;
1612 cs.l = 1;
1613 }
1614 kvm_x86_ops->set_segment(ctxt->vcpu, &cs, VCPU_SREG_CS);
1615 kvm_x86_ops->set_segment(ctxt->vcpu, &ss, VCPU_SREG_SS);
1616
1617 c->regs[VCPU_REGS_RCX] = c->eip;
1618 if (is_long_mode(ctxt->vcpu)) {
1619#ifdef CONFIG_X86_64
1620 c->regs[VCPU_REGS_R11] = ctxt->eflags & ~EFLG_RF;
1621
1622 kvm_x86_ops->get_msr(ctxt->vcpu,
1623 ctxt->mode == X86EMUL_MODE_PROT64 ?
1624 MSR_LSTAR : MSR_CSTAR, &msr_data);
1625 c->eip = msr_data;
1626
1627 kvm_x86_ops->get_msr(ctxt->vcpu, MSR_SYSCALL_MASK, &msr_data);
1628 ctxt->eflags &= ~(msr_data | EFLG_RF);
1629#endif
1630 } else {
1631 /* legacy mode */
1632 kvm_x86_ops->get_msr(ctxt->vcpu, MSR_STAR, &msr_data);
1633 c->eip = (u32)msr_data;
1634
1635 ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF);
1636 }
1637
e54cfa97 1638 return X86EMUL_CONTINUE;
e66bb2cc
AP		 1639}
1640
8c604352
AP		 1641static int
1642emulate_sysenter(struct x86_emulate_ctxt *ctxt)
1643{
1644 struct decode_cache *c = &ctxt->decode;
1645 struct kvm_segment cs, ss;
1646 u64 msr_data;
1647
a0044755
GN		 1648 /* inject #GP if in real mode */
1649 if (ctxt->mode == X86EMUL_MODE_REAL) {
8c604352 1650 kvm_inject_gp(ctxt->vcpu, 0);
e54cfa97 1651 return X86EMUL_UNHANDLEABLE;
8c604352
AP		 1652 }
1653
1654 /* XXX sysenter/sysexit have not been tested in 64bit mode.
1655 * Therefore, we inject an #UD.
1656 */
1657 if (ctxt->mode == X86EMUL_MODE_PROT64)
e54cfa97 1658 return X86EMUL_UNHANDLEABLE;
8c604352
AP		 1659
1660 setup_syscalls_segments(ctxt, &cs, &ss);
1661
1662 kvm_x86_ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_CS, &msr_data);
1663 switch (ctxt->mode) {
1664 case X86EMUL_MODE_PROT32:
1665 if ((msr_data & 0xfffc) == 0x0) {
1666 kvm_inject_gp(ctxt->vcpu, 0);
e54cfa97 1667 return X86EMUL_PROPAGATE_FAULT;
8c604352
AP		 1668 }
1669 break;
1670 case X86EMUL_MODE_PROT64:
1671 if (msr_data == 0x0) {
1672 kvm_inject_gp(ctxt->vcpu, 0);
e54cfa97 1673 return X86EMUL_PROPAGATE_FAULT;
8c604352
AP		 1674 }
1675 break;
1676 }
1677
1678 ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF);
1679 cs.selector = (u16)msr_data;
1680 cs.selector &= ~SELECTOR_RPL_MASK;
1681 ss.selector = cs.selector + 8;
1682 ss.selector &= ~SELECTOR_RPL_MASK;
1683 if (ctxt->mode == X86EMUL_MODE_PROT64
1684 || is_long_mode(ctxt->vcpu)) {
1685 cs.db = 0;
1686 cs.l = 1;
1687 }
1688
1689 kvm_x86_ops->set_segment(ctxt->vcpu, &cs, VCPU_SREG_CS);
1690 kvm_x86_ops->set_segment(ctxt->vcpu, &ss, VCPU_SREG_SS);
1691
1692 kvm_x86_ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_EIP, &msr_data);
1693 c->eip = msr_data;
1694
1695 kvm_x86_ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_ESP, &msr_data);
1696 c->regs[VCPU_REGS_RSP] = msr_data;
1697
e54cfa97 1698 return X86EMUL_CONTINUE;
8c604352
AP		 1699}
1700
4668f050
AP		 1701static int
1702emulate_sysexit(struct x86_emulate_ctxt *ctxt)
1703{
1704 struct decode_cache *c = &ctxt->decode;
1705 struct kvm_segment cs, ss;
1706 u64 msr_data;
1707 int usermode;
1708
a0044755
GN		 1709 /* inject #GP if in real mode or Virtual 8086 mode */
1710 if (ctxt->mode == X86EMUL_MODE_REAL ||
1711 ctxt->mode == X86EMUL_MODE_VM86) {
4668f050 1712 kvm_inject_gp(ctxt->vcpu, 0);
e54cfa97 1713 return X86EMUL_UNHANDLEABLE;
4668f050
AP		 1714 }
1715
4668f050
AP		 1716 setup_syscalls_segments(ctxt, &cs, &ss);
1717
1718 if ((c->rex_prefix & 0x8) != 0x0)
1719 usermode = X86EMUL_MODE_PROT64;
1720 else
1721 usermode = X86EMUL_MODE_PROT32;
1722
1723 cs.dpl = 3;
1724 ss.dpl = 3;
1725 kvm_x86_ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_CS, &msr_data);
1726 switch (usermode) {
1727 case X86EMUL_MODE_PROT32:
1728 cs.selector = (u16)(msr_data + 16);
1729 if ((msr_data & 0xfffc) == 0x0) {
1730 kvm_inject_gp(ctxt->vcpu, 0);
e54cfa97 1731 return X86EMUL_PROPAGATE_FAULT;
4668f050
AP		 1732 }
1733 ss.selector = (u16)(msr_data + 24);
1734 break;
1735 case X86EMUL_MODE_PROT64:
1736 cs.selector = (u16)(msr_data + 32);
1737 if (msr_data == 0x0) {
1738 kvm_inject_gp(ctxt->vcpu, 0);
e54cfa97 1739 return X86EMUL_PROPAGATE_FAULT;
4668f050
AP		 1740 }
1741 ss.selector = cs.selector + 8;
1742 cs.db = 0;
1743 cs.l = 1;
1744 break;
1745 }
1746 cs.selector |= SELECTOR_RPL_MASK;
1747 ss.selector |= SELECTOR_RPL_MASK;
1748
1749 kvm_x86_ops->set_segment(ctxt->vcpu, &cs, VCPU_SREG_CS);
1750 kvm_x86_ops->set_segment(ctxt->vcpu, &ss, VCPU_SREG_SS);
1751
1752 c->eip = ctxt->vcpu->arch.regs[VCPU_REGS_RDX];
1753 c->regs[VCPU_REGS_RSP] = ctxt->vcpu->arch.regs[VCPU_REGS_RCX];
1754
e54cfa97 1755 return X86EMUL_CONTINUE;
4668f050
AP		 1756}
1757
f850e2e6
GN		 1758static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt)
1759{
1760 int iopl;
1761 if (ctxt->mode == X86EMUL_MODE_REAL)
1762 return false;
1763 if (ctxt->mode == X86EMUL_MODE_VM86)
1764 return true;
1765 iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
1766 return kvm_x86_ops->get_cpl(ctxt->vcpu) > iopl;
1767}
1768
1769static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt,
1770 struct x86_emulate_ops *ops,
1771 u16 port, u16 len)
1772{
1773 struct kvm_segment tr_seg;
1774 int r;
1775 u16 io_bitmap_ptr;
1776 u8 perm, bit_idx = port & 0x7;
1777 unsigned mask = (1 << len) - 1;
1778
1779 kvm_get_segment(ctxt->vcpu, &tr_seg, VCPU_SREG_TR);
1780 if (tr_seg.unusable)
1781 return false;
1782 if (tr_seg.limit < 103)
1783 return false;
1784 r = ops->read_std(tr_seg.base + 102, &io_bitmap_ptr, 2, ctxt->vcpu,
1785 NULL);
1786 if (r != X86EMUL_CONTINUE)
1787 return false;
1788 if (io_bitmap_ptr + port/8 > tr_seg.limit)
1789 return false;
1790 r = ops->read_std(tr_seg.base + io_bitmap_ptr + port/8, &perm, 1,
1791 ctxt->vcpu, NULL);
1792 if (r != X86EMUL_CONTINUE)
1793 return false;
1794 if ((perm >> bit_idx) & mask)
1795 return false;
1796 return true;
1797}
1798
1799static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt,
1800 struct x86_emulate_ops *ops,
1801 u16 port, u16 len)
1802{
1803 if (emulator_bad_iopl(ctxt))
1804 if (!emulator_io_port_access_allowed(ctxt, ops, port, len))
1805 return false;
1806 return true;
1807}
1808
8b4caf66 1809int
1be3aa47 1810x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
8b4caf66 1811{
e8d8d7fe 1812 unsigned long memop = 0;
8b4caf66 1813 u64 msr_data;
3427318f 1814 unsigned long saved_eip = 0;
8b4caf66 1815 struct decode_cache *c = &ctxt->decode;
a6a3034c
MG		 1816 unsigned int port;
1817 int io_dir_in;
1b30eaa8 1818 int rc = X86EMUL_CONTINUE;
8b4caf66 1819
310b5d30
GC		 1820 ctxt->interruptibility = 0;
1821
3427318f
LV		 1822 /* Shadow copy of register state. Committed on successful emulation.
1823 * NOTE: we can copy them from vcpu as x86_decode_insn() doesn't
1824 * modify them.
1825 */
1826
ad312c7c 1827 memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs);
3427318f
LV		 1828 saved_eip = c->eip;
1829
1161624f
GN		 1830 if (ctxt->mode == X86EMUL_MODE_PROT64 && (c->d & No64)) {
1831 kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
1832 goto done;
1833 }
1834
d380a5e4
GN		 1835 /* LOCK prefix is allowed only with some instructions */
1836 if (c->lock_prefix && !(c->d & Lock)) {
1837 kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
1838 goto done;
1839 }
1840
e92805ac
GN		 1841 /* Privileged instruction can be executed only in CPL=0 */
1842 if ((c->d & Priv) && kvm_x86_ops->get_cpl(ctxt->vcpu)) {
1843 kvm_inject_gp(ctxt->vcpu, 0);
1844 goto done;
1845 }
1846
c7e75a3d 1847 if (((c->d & ModRM) && (c->modrm_mod != 3)) || (c->d & MemAbs))
e8d8d7fe 1848 memop = c->modrm_ea;
8b4caf66 1849
b9fa9d6b
AK		 1850 if (c->rep_prefix && (c->d & String)) {
1851 /* All REP prefixes have the same first termination condition */
1852 if (c->regs[VCPU_REGS_RCX] == 0) {
5fdbf976 1853 kvm_rip_write(ctxt->vcpu, c->eip);
b9fa9d6b
AK		 1854 goto done;
1855 }
1856 /* The second termination condition only applies for REPE
1857 * and REPNE. Test if the repeat string operation prefix is
1858 * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
1859 * corresponding termination condition according to:
1860 * - if REPE/REPZ and ZF = 0 then done
1861 * - if REPNE/REPNZ and ZF = 1 then done
1862 */
1863 if ((c->b == 0xa6) || (c->b == 0xa7) ||
1864 (c->b == 0xae) || (c->b == 0xaf)) {
1865 if ((c->rep_prefix == REPE_PREFIX) &&
1866 ((ctxt->eflags & EFLG_ZF) == 0)) {
5fdbf976 1867 kvm_rip_write(ctxt->vcpu, c->eip);
b9fa9d6b
AK		 1868 goto done;
1869 }
1870 if ((c->rep_prefix == REPNE_PREFIX) &&
1871 ((ctxt->eflags & EFLG_ZF) == EFLG_ZF)) {
5fdbf976 1872 kvm_rip_write(ctxt->vcpu, c->eip);
b9fa9d6b
AK		 1873 goto done;
1874 }
1875 }
1876 c->regs[VCPU_REGS_RCX]--;
5fdbf976 1877 c->eip = kvm_rip_read(ctxt->vcpu);
b9fa9d6b
AK		 1878 }
1879
8b4caf66 1880 if (c->src.type == OP_MEM) {
e8d8d7fe 1881 c->src.ptr = (unsigned long *)memop;
8b4caf66 1882 c->src.val = 0;
d77c26fc
MD		 1883 rc = ops->read_emulated((unsigned long)c->src.ptr,
1884 &c->src.val,
1885 c->src.bytes,
1886 ctxt->vcpu);
b60d513c 1887 if (rc != X86EMUL_CONTINUE)
8b4caf66
LV		 1888 goto done;
1889 c->src.orig_val = c->src.val;
1890 }
1891
e35b7b9c
GN		 1892 if (c->src2.type == OP_MEM) {
1893 c->src2.ptr = (unsigned long *)(memop + c->src.bytes);
1894 c->src2.val = 0;
1895 rc = ops->read_emulated((unsigned long)c->src2.ptr,
1896 &c->src2.val,
1897 c->src2.bytes,
1898 ctxt->vcpu);
1899 if (rc != X86EMUL_CONTINUE)
1900 goto done;
1901 }
1902
8b4caf66
LV		 1903 if ((c->d & DstMask) == ImplicitOps)
1904 goto special_insn;
1905
1906
1907 if (c->dst.type == OP_MEM) {
e8d8d7fe 1908 c->dst.ptr = (unsigned long *)memop;
8b4caf66
LV		 1909 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
1910 c->dst.val = 0;
e4e03ded
LV		 1911 if (c->d & BitOp) {
1912 unsigned long mask = ~(c->dst.bytes * 8 - 1);
df513e2c 1913
e4e03ded
LV		 1914 c->dst.ptr = (void *)c->dst.ptr +
1915 (c->src.val & mask) / 8;
038e51de 1916 }
b60d513c
TY		 1917 if (!(c->d & Mov)) {
1918 /* optimisation - avoid slow emulated read */
1919 rc = ops->read_emulated((unsigned long)c->dst.ptr,
1920 &c->dst.val,
1921 c->dst.bytes,
1922 ctxt->vcpu);
1923 if (rc != X86EMUL_CONTINUE)
1924 goto done;
1925 }
038e51de 1926 }
e4e03ded 1927 c->dst.orig_val = c->dst.val;
038e51de 1928
018a98db
AK		 1929special_insn:
1930
e4e03ded 1931 if (c->twobyte)
6aa8b732
AK		 1932 goto twobyte_insn;
1933
e4e03ded 1934 switch (c->b) {
6aa8b732
AK		 1935 case 0x00 ... 0x05:
1936 add: /* add */
05f086f8 1937 emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags);
6aa8b732 1938 break;
0934ac9d 1939 case 0x06: /* push es */
0934ac9d
MG		 1940 emulate_push_sreg(ctxt, VCPU_SREG_ES);
1941 break;
1942 case 0x07: /* pop es */
0934ac9d 1943 rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_ES);
1b30eaa8 1944 if (rc != X86EMUL_CONTINUE)
0934ac9d
MG		 1945 goto done;
1946 break;
6aa8b732
AK		 1947 case 0x08 ... 0x0d:
1948 or: /* or */
05f086f8 1949 emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags);
6aa8b732 1950 break;
0934ac9d 1951 case 0x0e: /* push cs */
0934ac9d
MG		 1952 emulate_push_sreg(ctxt, VCPU_SREG_CS);
1953 break;
6aa8b732
AK		 1954 case 0x10 ... 0x15:
1955 adc: /* adc */
05f086f8 1956 emulate_2op_SrcV("adc", c->src, c->dst, ctxt->eflags);
6aa8b732 1957 break;
0934ac9d 1958 case 0x16: /* push ss */
0934ac9d
MG		 1959 emulate_push_sreg(ctxt, VCPU_SREG_SS);
1960 break;
1961 case 0x17: /* pop ss */
0934ac9d 1962 rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_SS);
1b30eaa8 1963 if (rc != X86EMUL_CONTINUE)
0934ac9d
MG		 1964 goto done;
1965 break;
6aa8b732
AK		 1966 case 0x18 ... 0x1d:
1967 sbb: /* sbb */
05f086f8 1968 emulate_2op_SrcV("sbb", c->src, c->dst, ctxt->eflags);
6aa8b732 1969 break;
0934ac9d 1970 case 0x1e: /* push ds */
0934ac9d
MG		 1971 emulate_push_sreg(ctxt, VCPU_SREG_DS);
1972 break;
1973 case 0x1f: /* pop ds */
0934ac9d 1974 rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_DS);
1b30eaa8 1975 if (rc != X86EMUL_CONTINUE)
0934ac9d
MG		 1976 goto done;
1977 break;
aa3a816b 1978 case 0x20 ... 0x25:
6aa8b732 1979 and: /* and */
05f086f8 1980 emulate_2op_SrcV("and", c->src, c->dst, ctxt->eflags);
6aa8b732
AK		 1981 break;
1982 case 0x28 ... 0x2d:
1983 sub: /* sub */
05f086f8 1984 emulate_2op_SrcV("sub", c->src, c->dst, ctxt->eflags);
6aa8b732
AK		 1985 break;
1986 case 0x30 ... 0x35:
1987 xor: /* xor */
05f086f8 1988 emulate_2op_SrcV("xor", c->src, c->dst, ctxt->eflags);
6aa8b732
AK		 1989 break;
1990 case 0x38 ... 0x3d:
1991 cmp: /* cmp */
05f086f8 1992 emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
6aa8b732 1993 break;
33615aa9
AK		 1994 case 0x40 ... 0x47: /* inc r16/r32 */
1995 emulate_1op("inc", c->dst, ctxt->eflags);
1996 break;
1997 case 0x48 ... 0x4f: /* dec r16/r32 */
1998 emulate_1op("dec", c->dst, ctxt->eflags);
1999 break;
2000 case 0x50 ... 0x57: /* push reg */
2786b014 2001 emulate_push(ctxt);
33615aa9
AK		 2002 break;
2003 case 0x58 ... 0x5f: /* pop reg */
2004 pop_instruction:
350f69dc 2005 rc = emulate_pop(ctxt, ops, &c->dst.val, c->op_bytes);
1b30eaa8 2006 if (rc != X86EMUL_CONTINUE)
33615aa9 2007 goto done;
33615aa9 2008 break;
abcf14b5
MG		 2009 case 0x60: /* pusha */
2010 emulate_pusha(ctxt);
2011 break;
2012 case 0x61: /* popa */
2013 rc = emulate_popa(ctxt, ops);
1b30eaa8 2014 if (rc != X86EMUL_CONTINUE)
abcf14b5
MG		 2015 goto done;
2016 break;
6aa8b732 2017 case 0x63: /* movsxd */
8b4caf66 2018 if (ctxt->mode != X86EMUL_MODE_PROT64)
6aa8b732 2019 goto cannot_emulate;
e4e03ded 2020 c->dst.val = (s32) c->src.val;
6aa8b732 2021 break;
91ed7a0e 2022 case 0x68: /* push imm */
018a98db 2023 case 0x6a: /* push imm8 */
018a98db
AK		 2024 emulate_push(ctxt);
2025 break;
2026 case 0x6c: /* insb */
2027 case 0x6d: /* insw/insd */
f850e2e6
GN		 2028 if (!emulator_io_permited(ctxt, ops, c->regs[VCPU_REGS_RDX],
2029 (c->d & ByteOp) ? 1 : c->op_bytes)) {
2030 kvm_inject_gp(ctxt->vcpu, 0);
2031 goto done;
2032 }
2033 if (kvm_emulate_pio_string(ctxt->vcpu,
018a98db
AK		 2034 1,
2035 (c->d & ByteOp) ? 1 : c->op_bytes,
2036 c->rep_prefix ?
e4706772 2037 address_mask(c, c->regs[VCPU_REGS_RCX]) : 1,
018a98db 2038 (ctxt->eflags & EFLG_DF),
7a5b56df 2039 register_address(c, es_base(ctxt),
018a98db
AK		 2040 c->regs[VCPU_REGS_RDI]),
2041 c->rep_prefix,
2042 c->regs[VCPU_REGS_RDX]) == 0) {
2043 c->eip = saved_eip;
2044 return -1;
2045 }
2046 return 0;
2047 case 0x6e: /* outsb */
2048 case 0x6f: /* outsw/outsd */
f850e2e6
GN		 2049 if (!emulator_io_permited(ctxt, ops, c->regs[VCPU_REGS_RDX],
2050 (c->d & ByteOp) ? 1 : c->op_bytes)) {
2051 kvm_inject_gp(ctxt->vcpu, 0);
2052 goto done;
2053 }
851ba692 2054 if (kvm_emulate_pio_string(ctxt->vcpu,
018a98db
AK		 2055 0,
2056 (c->d & ByteOp) ? 1 : c->op_bytes,
2057 c->rep_prefix ?
e4706772 2058 address_mask(c, c->regs[VCPU_REGS_RCX]) : 1,
018a98db 2059 (ctxt->eflags & EFLG_DF),
7a5b56df
AK		 2060 register_address(c,
2061 seg_override_base(ctxt, c),
018a98db
AK		 2062 c->regs[VCPU_REGS_RSI]),
2063 c->rep_prefix,
2064 c->regs[VCPU_REGS_RDX]) == 0) {
2065 c->eip = saved_eip;
2066 return -1;
2067 }
2068 return 0;
b2833e3c 2069 case 0x70 ... 0x7f: /* jcc (short) */
018a98db 2070 if (test_cc(c->b, ctxt->eflags))
b2833e3c 2071 jmp_rel(c, c->src.val);
018a98db 2072 break;
6aa8b732 2073 case 0x80 ... 0x83: /* Grp1 */
e4e03ded 2074 switch (c->modrm_reg) {
6aa8b732
AK		 2075 case 0:
2076 goto add;
2077 case 1:
2078 goto or;
2079 case 2:
2080 goto adc;
2081 case 3:
2082 goto sbb;
2083 case 4:
2084 goto and;
2085 case 5:
2086 goto sub;
2087 case 6:
2088 goto xor;
2089 case 7:
2090 goto cmp;
2091 }
2092 break;
2093 case 0x84 ... 0x85:
05f086f8 2094 emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags);
6aa8b732
AK		 2095 break;
2096 case 0x86 ... 0x87: /* xchg */
b13354f8 2097 xchg:
6aa8b732 2098 /* Write back the register source. */
e4e03ded 2099 switch (c->dst.bytes) {
6aa8b732 2100 case 1:
e4e03ded 2101 *(u8 *) c->src.ptr = (u8) c->dst.val;
6aa8b732
AK		 2102 break;
2103 case 2:
e4e03ded 2104 *(u16 *) c->src.ptr = (u16) c->dst.val;
6aa8b732
AK		 2105 break;
2106 case 4:
e4e03ded 2107 *c->src.ptr = (u32) c->dst.val;
6aa8b732
AK		 2108 break; /* 64b reg: zero-extend */
2109 case 8:
e4e03ded 2110 *c->src.ptr = c->dst.val;
6aa8b732
AK		 2111 break;
2112 }
2113 /*
2114 * Write back the memory destination with implicit LOCK
2115 * prefix.
2116 */
e4e03ded
LV		 2117 c->dst.val = c->src.val;
2118 c->lock_prefix = 1;
6aa8b732 2119 break;
6aa8b732 2120 case 0x88 ... 0x8b: /* mov */
7de75248 2121 goto mov;
38d5bc6d
GT		 2122 case 0x8c: { /* mov r/m, sreg */
2123 struct kvm_segment segreg;
2124
2125 if (c->modrm_reg <= 5)
2126 kvm_get_segment(ctxt->vcpu, &segreg, c->modrm_reg);
2127 else {
2128 printk(KERN_INFO "0x8c: Invalid segreg in modrm byte 0x%02x\n",
2129 c->modrm);
2130 goto cannot_emulate;
2131 }
2132 c->dst.val = segreg.selector;
2133 break;
2134 }
7e0b54b1 2135 case 0x8d: /* lea r16/r32, m */
f9b7aab3 2136 c->dst.val = c->modrm_ea;
7e0b54b1 2137 break;
4257198a
GT		 2138 case 0x8e: { /* mov seg, r/m16 */
2139 uint16_t sel;
4257198a
GT		 2140
2141 sel = c->src.val;
8b9f4414 2142
c697518a
GN		 2143 if (c->modrm_reg == VCPU_SREG_CS ||
2144 c->modrm_reg > VCPU_SREG_GS) {
8b9f4414
GN		 2145 kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
2146 goto done;
2147 }
2148
310b5d30 2149 if (c->modrm_reg == VCPU_SREG_SS)
48005f64 2150 toggle_interruptibility(ctxt, KVM_X86_SHADOW_INT_MOV_SS);
310b5d30 2151
c697518a 2152 rc = kvm_load_segment_descriptor(ctxt->vcpu, sel, c->modrm_reg);
4257198a
GT		 2153
2154 c->dst.type = OP_NONE; /* Disable writeback. */
2155 break;
2156 }
6aa8b732 2157 case 0x8f: /* pop (sole member of Grp1a) */
8cdbd2c9 2158 rc = emulate_grp1a(ctxt, ops);
1b30eaa8 2159 if (rc != X86EMUL_CONTINUE)
6aa8b732 2160 goto done;
6aa8b732 2161 break;
b13354f8
MG		 2162 case 0x90: /* nop / xchg r8,rax */
2163 if (!(c->rex_prefix & 1)) { /* nop */
2164 c->dst.type = OP_NONE;
2165 break;
2166 }
2167 case 0x91 ... 0x97: /* xchg reg,rax */
2168 c->src.type = c->dst.type = OP_REG;
2169 c->src.bytes = c->dst.bytes = c->op_bytes;
2170 c->src.ptr = (unsigned long *) &c->regs[VCPU_REGS_RAX];
2171 c->src.val = *(c->src.ptr);
2172 goto xchg;
fd2a7608 2173 case 0x9c: /* pushf */
05f086f8 2174 c->src.val = (unsigned long) ctxt->eflags;
8cdbd2c9
LV		 2175 emulate_push(ctxt);
2176 break;
535eabcf 2177 case 0x9d: /* popf */
2b48cc75 2178 c->dst.type = OP_REG;
05f086f8 2179 c->dst.ptr = (unsigned long *) &ctxt->eflags;
2b48cc75 2180 c->dst.bytes = c->op_bytes;
d4c6a154
GN		 2181 rc = emulate_popf(ctxt, ops, &c->dst.val, c->op_bytes);
2182 if (rc != X86EMUL_CONTINUE)
2183 goto done;
2184 break;
018a98db
AK		 2185 case 0xa0 ... 0xa1: /* mov */
2186 c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
2187 c->dst.val = c->src.val;
2188 break;
2189 case 0xa2 ... 0xa3: /* mov */
2190 c->dst.val = (unsigned long)c->regs[VCPU_REGS_RAX];
2191 break;
6aa8b732 2192 case 0xa4 ... 0xa5: /* movs */
e4e03ded
LV		 2193 c->dst.type = OP_MEM;
2194 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
e4706772 2195 c->dst.ptr = (unsigned long *)register_address(c,
7a5b56df 2196 es_base(ctxt),
e4e03ded 2197 c->regs[VCPU_REGS_RDI]);
b60d513c
TY		 2198 rc = ops->read_emulated(register_address(c,
2199 seg_override_base(ctxt, c),
2200 c->regs[VCPU_REGS_RSI]),
e4e03ded 2201 &c->dst.val,
b60d513c
TY		 2202 c->dst.bytes, ctxt->vcpu);
2203 if (rc != X86EMUL_CONTINUE)
6aa8b732 2204 goto done;
7a957275 2205 register_address_increment(c, &c->regs[VCPU_REGS_RSI],
05f086f8 2206 (ctxt->eflags & EFLG_DF) ? -c->dst.bytes
e4e03ded 2207 : c->dst.bytes);
7a957275 2208 register_address_increment(c, &c->regs[VCPU_REGS_RDI],
05f086f8 2209 (ctxt->eflags & EFLG_DF) ? -c->dst.bytes
e4e03ded 2210 : c->dst.bytes);
6aa8b732
AK		 2211 break;
2212 case 0xa6 ... 0xa7: /* cmps */
d7e5117a
GT		 2213 c->src.type = OP_NONE; /* Disable writeback. */
2214 c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
e4706772 2215 c->src.ptr = (unsigned long *)register_address(c,
7a5b56df 2216 seg_override_base(ctxt, c),
d7e5117a 2217 c->regs[VCPU_REGS_RSI]);
b60d513c
TY		 2218 rc = ops->read_emulated((unsigned long)c->src.ptr,
2219 &c->src.val,
2220 c->src.bytes,
2221 ctxt->vcpu);
2222 if (rc != X86EMUL_CONTINUE)
d7e5117a
GT		 2223 goto done;
2224
2225 c->dst.type = OP_NONE; /* Disable writeback. */
2226 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
e4706772 2227 c->dst.ptr = (unsigned long *)register_address(c,
7a5b56df 2228 es_base(ctxt),
d7e5117a 2229 c->regs[VCPU_REGS_RDI]);
b60d513c
TY		 2230 rc = ops->read_emulated((unsigned long)c->dst.ptr,
2231 &c->dst.val,
2232 c->dst.bytes,
2233 ctxt->vcpu);
2234 if (rc != X86EMUL_CONTINUE)
d7e5117a
GT		 2235 goto done;
2236
2237 DPRINTF("cmps: mem1=0x%p mem2=0x%p\n", c->src.ptr, c->dst.ptr);
2238
2239 emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
2240
7a957275 2241 register_address_increment(c, &c->regs[VCPU_REGS_RSI],
d7e5117a
GT		 2242 (ctxt->eflags & EFLG_DF) ? -c->src.bytes
2243 : c->src.bytes);
7a957275 2244 register_address_increment(c, &c->regs[VCPU_REGS_RDI],
d7e5117a
GT		 2245 (ctxt->eflags & EFLG_DF) ? -c->dst.bytes
2246 : c->dst.bytes);
2247
2248 break;
6aa8b732 2249 case 0xaa ... 0xab: /* stos */
e4e03ded
LV		 2250 c->dst.type = OP_MEM;
2251 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
e4706772 2252 c->dst.ptr = (unsigned long *)register_address(c,
7a5b56df 2253 es_base(ctxt),
a7e6c88a 2254 c->regs[VCPU_REGS_RDI]);
e4e03ded 2255 c->dst.val = c->regs[VCPU_REGS_RAX];
7a957275 2256 register_address_increment(c, &c->regs[VCPU_REGS_RDI],
05f086f8 2257 (ctxt->eflags & EFLG_DF) ? -c->dst.bytes
e4e03ded 2258 : c->dst.bytes);
6aa8b732
AK		 2259 break;
2260 case 0xac ... 0xad: /* lods */
e4e03ded
LV		 2261 c->dst.type = OP_REG;
2262 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
2263 c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
b60d513c
TY		 2264 rc = ops->read_emulated(register_address(c,
2265 seg_override_base(ctxt, c),
2266 c->regs[VCPU_REGS_RSI]),
2267 &c->dst.val,
2268 c->dst.bytes,
2269 ctxt->vcpu);
2270 if (rc != X86EMUL_CONTINUE)
6aa8b732 2271 goto done;
7a957275 2272 register_address_increment(c, &c->regs[VCPU_REGS_RSI],
05f086f8 2273 (ctxt->eflags & EFLG_DF) ? -c->dst.bytes
e4e03ded 2274 : c->dst.bytes);
6aa8b732
AK		 2275 break;
2276 case 0xae ... 0xaf: /* scas */
2277 DPRINTF("Urk! I don't handle SCAS.\n");
2278 goto cannot_emulate;
a5e2e82b 2279 case 0xb0 ... 0xbf: /* mov r, imm */
615ac125 2280 goto mov;
018a98db
AK		 2281 case 0xc0 ... 0xc1:
2282 emulate_grp2(ctxt);
2283 break;
111de5d6 2284 case 0xc3: /* ret */
cf5de4f8 2285 c->dst.type = OP_REG;
111de5d6 2286 c->dst.ptr = &c->eip;
cf5de4f8 2287 c->dst.bytes = c->op_bytes;
111de5d6 2288 goto pop_instruction;
018a98db
AK		 2289 case 0xc6 ... 0xc7: /* mov (sole member of Grp11) */
2290 mov:
2291 c->dst.val = c->src.val;
2292 break;
a77ab5ea
AK		 2293 case 0xcb: /* ret far */
2294 rc = emulate_ret_far(ctxt, ops);
1b30eaa8 2295 if (rc != X86EMUL_CONTINUE)
a77ab5ea
AK		 2296 goto done;
2297 break;
018a98db
AK		 2298 case 0xd0 ... 0xd1: /* Grp2 */
2299 c->src.val = 1;
2300 emulate_grp2(ctxt);
2301 break;
2302 case 0xd2 ... 0xd3: /* Grp2 */
2303 c->src.val = c->regs[VCPU_REGS_RCX];
2304 emulate_grp2(ctxt);
2305 break;
a6a3034c
MG		 2306 case 0xe4: /* inb */
2307 case 0xe5: /* in */
84ce66a6 2308 port = c->src.val;
a6a3034c
MG		 2309 io_dir_in = 1;
2310 goto do_io;
2311 case 0xe6: /* outb */
2312 case 0xe7: /* out */
84ce66a6 2313 port = c->src.val;
a6a3034c
MG		 2314 io_dir_in = 0;
2315 goto do_io;
1a52e051 2316 case 0xe8: /* call (near) */ {
d53c4777 2317 long int rel = c->src.val;
e4e03ded 2318 c->src.val = (unsigned long) c->eip;
7a957275 2319 jmp_rel(c, rel);
8cdbd2c9
LV		 2320 emulate_push(ctxt);
2321 break;
1a52e051
NK		 2322 }
2323 case 0xe9: /* jmp rel */
954cd36f 2324 goto jmp;
782b877c 2325 case 0xea: /* jmp far */
ea79849d 2326 jump_far:
c697518a
GN		 2327 if (kvm_load_segment_descriptor(ctxt->vcpu, c->src2.val,
2328 VCPU_SREG_CS))
2329 goto done;
954cd36f 2330
782b877c 2331 c->eip = c->src.val;
954cd36f 2332 break;
954cd36f
GT		 2333 case 0xeb:
2334 jmp: /* jmp rel short */
7a957275 2335 jmp_rel(c, c->src.val);
a01af5ec 2336 c->dst.type = OP_NONE; /* Disable writeback. */
1a52e051 2337 break;
a6a3034c
MG		 2338 case 0xec: /* in al,dx */
2339 case 0xed: /* in (e/r)ax,dx */
2340 port = c->regs[VCPU_REGS_RDX];
2341 io_dir_in = 1;
2342 goto do_io;
2343 case 0xee: /* out al,dx */
2344 case 0xef: /* out (e/r)ax,dx */
2345 port = c->regs[VCPU_REGS_RDX];
2346 io_dir_in = 0;
f850e2e6
GN		 2347 do_io:
2348 if (!emulator_io_permited(ctxt, ops, port,
2349 (c->d & ByteOp) ? 1 : c->op_bytes)) {
2350 kvm_inject_gp(ctxt->vcpu, 0);
2351 goto done;
2352 }
2353 if (kvm_emulate_pio(ctxt->vcpu, io_dir_in,
a6a3034c
MG		 2354 (c->d & ByteOp) ? 1 : c->op_bytes,
2355 port) != 0) {
2356 c->eip = saved_eip;
2357 goto cannot_emulate;
2358 }
e93f36bc 2359 break;
111de5d6 2360 case 0xf4: /* hlt */
ad312c7c 2361 ctxt->vcpu->arch.halt_request = 1;
19fdfa0d 2362 break;
111de5d6
AK		 2363 case 0xf5: /* cmc */
2364 /* complement carry flag from eflags reg */
2365 ctxt->eflags ^= EFLG_CF;
2366 c->dst.type = OP_NONE; /* Disable writeback. */
2367 break;
018a98db
AK		 2368 case 0xf6 ... 0xf7: /* Grp3 */
2369 rc = emulate_grp3(ctxt, ops);
1b30eaa8 2370 if (rc != X86EMUL_CONTINUE)
018a98db
AK		 2371 goto done;
2372 break;
111de5d6
AK		 2373 case 0xf8: /* clc */
2374 ctxt->eflags &= ~EFLG_CF;
2375 c->dst.type = OP_NONE; /* Disable writeback. */
2376 break;
2377 case 0xfa: /* cli */
f850e2e6
GN		 2378 if (emulator_bad_iopl(ctxt))
2379 kvm_inject_gp(ctxt->vcpu, 0);
2380 else {
2381 ctxt->eflags &= ~X86_EFLAGS_IF;
2382 c->dst.type = OP_NONE; /* Disable writeback. */
2383 }
111de5d6
AK		 2384 break;
2385 case 0xfb: /* sti */
f850e2e6
GN		 2386 if (emulator_bad_iopl(ctxt))
2387 kvm_inject_gp(ctxt->vcpu, 0);
2388 else {
48005f64 2389 toggle_interruptibility(ctxt, KVM_X86_SHADOW_INT_STI);
f850e2e6
GN		 2390 ctxt->eflags |= X86_EFLAGS_IF;
2391 c->dst.type = OP_NONE; /* Disable writeback. */
2392 }
111de5d6 2393 break;
fb4616f4
MG		 2394 case 0xfc: /* cld */
2395 ctxt->eflags &= ~EFLG_DF;
2396 c->dst.type = OP_NONE; /* Disable writeback. */
2397 break;
2398 case 0xfd: /* std */
2399 ctxt->eflags |= EFLG_DF;
2400 c->dst.type = OP_NONE; /* Disable writeback. */
2401 break;
ea79849d
GN		 2402 case 0xfe: /* Grp4 */
2403 grp45:
018a98db 2404 rc = emulate_grp45(ctxt, ops);
1b30eaa8 2405 if (rc != X86EMUL_CONTINUE)
018a98db
AK		 2406 goto done;
2407 break;
ea79849d
GN		 2408 case 0xff: /* Grp5 */
2409 if (c->modrm_reg == 5)
2410 goto jump_far;
2411 goto grp45;
6aa8b732 2412 }
018a98db
AK		 2413
2414writeback:
2415 rc = writeback(ctxt, ops);
1b30eaa8 2416 if (rc != X86EMUL_CONTINUE)
018a98db
AK		 2417 goto done;
2418
2419 /* Commit shadow register state. */
ad312c7c 2420 memcpy(ctxt->vcpu->arch.regs, c->regs, sizeof c->regs);
5fdbf976 2421 kvm_rip_write(ctxt->vcpu, c->eip);
018a98db
AK		 2422
2423done:
2424 if (rc == X86EMUL_UNHANDLEABLE) {
2425 c->eip = saved_eip;
2426 return -1;
2427 }
2428 return 0;
6aa8b732
AK		 2429
2430twobyte_insn:
e4e03ded 2431 switch (c->b) {
6aa8b732 2432 case 0x01: /* lgdt, lidt, lmsw */
e4e03ded 2433 switch (c->modrm_reg) {
6aa8b732
AK		 2434 u16 size;
2435 unsigned long address;
2436
aca7f966 2437 case 0: /* vmcall */
e4e03ded 2438 if (c->modrm_mod != 3 || c->modrm_rm != 1)
aca7f966
AL		 2439 goto cannot_emulate;
2440
7aa81cc0 2441 rc = kvm_fix_hypercall(ctxt->vcpu);
1b30eaa8 2442 if (rc != X86EMUL_CONTINUE)
7aa81cc0
AL		 2443 goto done;
2444
33e3885d 2445 /* Let the processor re-execute the fixed hypercall */
5fdbf976 2446 c->eip = kvm_rip_read(ctxt->vcpu);
16286d08
AK		 2447 /* Disable writeback. */
2448 c->dst.type = OP_NONE;
aca7f966 2449 break;
6aa8b732 2450 case 2: /* lgdt */
e4e03ded
LV		 2451 rc = read_descriptor(ctxt, ops, c->src.ptr,
2452 &size, &address, c->op_bytes);
1b30eaa8 2453 if (rc != X86EMUL_CONTINUE)
6aa8b732
AK		 2454 goto done;
2455 realmode_lgdt(ctxt->vcpu, size, address);
16286d08
AK		 2456 /* Disable writeback. */
2457 c->dst.type = OP_NONE;
6aa8b732 2458 break;
aca7f966 2459 case 3: /* lidt/vmmcall */
2b3d2a20
AK		 2460 if (c->modrm_mod == 3) {
2461 switch (c->modrm_rm) {
2462 case 1:
2463 rc = kvm_fix_hypercall(ctxt->vcpu);
1b30eaa8 2464 if (rc != X86EMUL_CONTINUE)
2b3d2a20
AK		 2465 goto done;
2466 break;
2467 default:
2468 goto cannot_emulate;
2469 }
aca7f966 2470 } else {
e4e03ded 2471 rc = read_descriptor(ctxt, ops, c->src.ptr,
aca7f966 2472 &size, &address,
e4e03ded 2473 c->op_bytes);
1b30eaa8 2474 if (rc != X86EMUL_CONTINUE)
aca7f966
AL		 2475 goto done;
2476 realmode_lidt(ctxt->vcpu, size, address);
2477 }
16286d08
AK		 2478 /* Disable writeback. */
2479 c->dst.type = OP_NONE;
6aa8b732
AK		 2480 break;
2481 case 4: /* smsw */
16286d08
AK		 2482 c->dst.bytes = 2;
2483 c->dst.val = realmode_get_cr(ctxt->vcpu, 0);
6aa8b732
AK		 2484 break;
2485 case 6: /* lmsw */
16286d08
AK		 2486 realmode_lmsw(ctxt->vcpu, (u16)c->src.val,
2487 &ctxt->eflags);
dc7457ea 2488 c->dst.type = OP_NONE;
6aa8b732
AK		 2489 break;
2490 case 7: /* invlpg*/
e8d8d7fe 2491 emulate_invlpg(ctxt->vcpu, memop);
16286d08
AK		 2492 /* Disable writeback. */
2493 c->dst.type = OP_NONE;
6aa8b732
AK		 2494 break;
2495 default:
2496 goto cannot_emulate;
2497 }
2498 break;
e99f0507 2499 case 0x05: /* syscall */
e54cfa97
TY		 2500 rc = emulate_syscall(ctxt);
2501 if (rc != X86EMUL_CONTINUE)
2502 goto done;
e66bb2cc
AP		 2503 else
2504 goto writeback;
e99f0507 2505 break;
018a98db
AK		 2506 case 0x06:
2507 emulate_clts(ctxt->vcpu);
2508 c->dst.type = OP_NONE;
2509 break;
2510 case 0x08: /* invd */
2511 case 0x09: /* wbinvd */
2512 case 0x0d: /* GrpP (prefetch) */
2513 case 0x18: /* Grp16 (prefetch/nop) */
2514 c->dst.type = OP_NONE;
2515 break;
2516 case 0x20: /* mov cr, reg */
2517 if (c->modrm_mod != 3)
2518 goto cannot_emulate;
2519 c->regs[c->modrm_rm] =
2520 realmode_get_cr(ctxt->vcpu, c->modrm_reg);
2521 c->dst.type = OP_NONE; /* no writeback */
2522 break;
6aa8b732 2523 case 0x21: /* mov from dr to reg */
e4e03ded 2524 if (c->modrm_mod != 3)
6aa8b732 2525 goto cannot_emulate;
0e4176a1 2526 if (emulator_get_dr(ctxt, c->modrm_reg, &c->regs[c->modrm_rm]))
a01af5ec 2527 goto cannot_emulate;
0e4176a1 2528 rc = X86EMUL_CONTINUE;
a01af5ec 2529 c->dst.type = OP_NONE; /* no writeback */
6aa8b732 2530 break;
018a98db
AK		 2531 case 0x22: /* mov reg, cr */
2532 if (c->modrm_mod != 3)
2533 goto cannot_emulate;
2534 realmode_set_cr(ctxt->vcpu,
2535 c->modrm_reg, c->modrm_val, &ctxt->eflags);
2536 c->dst.type = OP_NONE;
2537 break;
6aa8b732 2538 case 0x23: /* mov from reg to dr */
e4e03ded 2539 if (c->modrm_mod != 3)
6aa8b732 2540 goto cannot_emulate;
0e4176a1 2541 if (emulator_set_dr(ctxt, c->modrm_reg, c->regs[c->modrm_rm]))
a01af5ec 2542 goto cannot_emulate;
0e4176a1 2543 rc = X86EMUL_CONTINUE;
a01af5ec 2544 c->dst.type = OP_NONE; /* no writeback */
6aa8b732 2545 break;
018a98db
AK		 2546 case 0x30:
2547 /* wrmsr */
2548 msr_data = (u32)c->regs[VCPU_REGS_RAX]
2549 | ((u64)c->regs[VCPU_REGS_RDX] << 32);
0e4176a1 2550 if (kvm_set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data)) {
c1a5d4f9 2551 kvm_inject_gp(ctxt->vcpu, 0);
5fdbf976 2552 c->eip = kvm_rip_read(ctxt->vcpu);
018a98db
AK		 2553 }
2554 rc = X86EMUL_CONTINUE;
2555 c->dst.type = OP_NONE;
2556 break;
2557 case 0x32:
2558 /* rdmsr */
0e4176a1 2559 if (kvm_get_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], &msr_data)) {
c1a5d4f9 2560 kvm_inject_gp(ctxt->vcpu, 0);
5fdbf976 2561 c->eip = kvm_rip_read(ctxt->vcpu);
018a98db
AK		 2562 } else {
2563 c->regs[VCPU_REGS_RAX] = (u32)msr_data;
2564 c->regs[VCPU_REGS_RDX] = msr_data >> 32;
2565 }
2566 rc = X86EMUL_CONTINUE;
2567 c->dst.type = OP_NONE;
2568 break;
e99f0507 2569 case 0x34: /* sysenter */
e54cfa97
TY		 2570 rc = emulate_sysenter(ctxt);
2571 if (rc != X86EMUL_CONTINUE)
2572 goto done;
8c604352
AP		 2573 else
2574 goto writeback;
e99f0507
AP		 2575 break;
2576 case 0x35: /* sysexit */
e54cfa97
TY		 2577 rc = emulate_sysexit(ctxt);
2578 if (rc != X86EMUL_CONTINUE)
2579 goto done;
4668f050
AP		 2580 else
2581 goto writeback;
e99f0507 2582 break;
6aa8b732 2583 case 0x40 ... 0x4f: /* cmov */
e4e03ded 2584 c->dst.val = c->dst.orig_val = c->src.val;
a01af5ec
LV		 2585 if (!test_cc(c->b, ctxt->eflags))
2586 c->dst.type = OP_NONE; /* no writeback */
6aa8b732 2587 break;
b2833e3c 2588 case 0x80 ... 0x8f: /* jnz rel, etc*/
018a98db 2589 if (test_cc(c->b, ctxt->eflags))
b2833e3c 2590 jmp_rel(c, c->src.val);
018a98db
AK		 2591 c->dst.type = OP_NONE;
2592 break;
0934ac9d
MG		 2593 case 0xa0: /* push fs */
2594 emulate_push_sreg(ctxt, VCPU_SREG_FS);
2595 break;
2596 case 0xa1: /* pop fs */
2597 rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_FS);
1b30eaa8 2598 if (rc != X86EMUL_CONTINUE)
0934ac9d
MG		 2599 goto done;
2600 break;
7de75248
NK		 2601 case 0xa3:
2602 bt: /* bt */
e4f8e039 2603 c->dst.type = OP_NONE;
e4e03ded
LV		 2604 /* only subword offset */
2605 c->src.val &= (c->dst.bytes << 3) - 1;
05f086f8 2606 emulate_2op_SrcV_nobyte("bt", c->src, c->dst, ctxt->eflags);
7de75248 2607 break;
9bf8ea42
GT		 2608 case 0xa4: /* shld imm8, r, r/m */
2609 case 0xa5: /* shld cl, r, r/m */
2610 emulate_2op_cl("shld", c->src2, c->src, c->dst, ctxt->eflags);
2611 break;
0934ac9d
MG		 2612 case 0xa8: /* push gs */
2613 emulate_push_sreg(ctxt, VCPU_SREG_GS);
2614 break;
2615 case 0xa9: /* pop gs */
2616 rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_GS);
1b30eaa8 2617 if (rc != X86EMUL_CONTINUE)
0934ac9d
MG		 2618 goto done;
2619 break;
7de75248
NK		 2620 case 0xab:
2621 bts: /* bts */
e4e03ded
LV		 2622 /* only subword offset */
2623 c->src.val &= (c->dst.bytes << 3) - 1;
05f086f8 2624 emulate_2op_SrcV_nobyte("bts", c->src, c->dst, ctxt->eflags);
7de75248 2625 break;
9bf8ea42
GT		 2626 case 0xac: /* shrd imm8, r, r/m */
2627 case 0xad: /* shrd cl, r, r/m */
2628 emulate_2op_cl("shrd", c->src2, c->src, c->dst, ctxt->eflags);
2629 break;
2a7c5b8b
GC		 2630 case 0xae: /* clflush */
2631 break;
6aa8b732
AK		 2632 case 0xb0 ... 0xb1: /* cmpxchg */
2633 /*
2634 * Save real source value, then compare EAX against
2635 * destination.
2636 */
e4e03ded
LV		 2637 c->src.orig_val = c->src.val;
2638 c->src.val = c->regs[VCPU_REGS_RAX];
05f086f8
LV		 2639 emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
2640 if (ctxt->eflags & EFLG_ZF) {
6aa8b732 2641 /* Success: write back to memory. */
e4e03ded 2642 c->dst.val = c->src.orig_val;
6aa8b732
AK		 2643 } else {
2644 /* Failure: write the value we saw to EAX. */
e4e03ded
LV		 2645 c->dst.type = OP_REG;
2646 c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
6aa8b732
AK		 2647 }
2648 break;
6aa8b732
AK		 2649 case 0xb3:
2650 btr: /* btr */
e4e03ded
LV		 2651 /* only subword offset */
2652 c->src.val &= (c->dst.bytes << 3) - 1;
05f086f8 2653 emulate_2op_SrcV_nobyte("btr", c->src, c->dst, ctxt->eflags);
6aa8b732 2654 break;
6aa8b732 2655 case 0xb6 ... 0xb7: /* movzx */
e4e03ded
LV		 2656 c->dst.bytes = c->op_bytes;
2657 c->dst.val = (c->d & ByteOp) ? (u8) c->src.val
2658 : (u16) c->src.val;
6aa8b732 2659 break;
6aa8b732 2660 case 0xba: /* Grp8 */
e4e03ded 2661 switch (c->modrm_reg & 3) {
6aa8b732
AK		 2662 case 0:
2663 goto bt;
2664 case 1:
2665 goto bts;
2666 case 2:
2667 goto btr;
2668 case 3:
2669 goto btc;
2670 }
2671 break;
7de75248
NK		 2672 case 0xbb:
2673 btc: /* btc */
e4e03ded
LV		 2674 /* only subword offset */
2675 c->src.val &= (c->dst.bytes << 3) - 1;
05f086f8 2676 emulate_2op_SrcV_nobyte("btc", c->src, c->dst, ctxt->eflags);
7de75248 2677 break;
6aa8b732 2678 case 0xbe ... 0xbf: /* movsx */
e4e03ded
LV		 2679 c->dst.bytes = c->op_bytes;
2680 c->dst.val = (c->d & ByteOp) ? (s8) c->src.val :
2681 (s16) c->src.val;
6aa8b732 2682 break;
a012e65a 2683 case 0xc3: /* movnti */
e4e03ded
LV		 2684 c->dst.bytes = c->op_bytes;
2685 c->dst.val = (c->op_bytes == 4) ? (u32) c->src.val :
2686 (u64) c->src.val;
a012e65a 2687 break;
6aa8b732 2688 case 0xc7: /* Grp9 (cmpxchg8b) */
e8d8d7fe 2689 rc = emulate_grp9(ctxt, ops, memop);
1b30eaa8 2690 if (rc != X86EMUL_CONTINUE)
8cdbd2c9 2691 goto done;
018a98db 2692 c->dst.type = OP_NONE;
8cdbd2c9 2693 break;
6aa8b732
AK		 2694 }
2695 goto writeback;
2696
2697cannot_emulate:
e4e03ded 2698 DPRINTF("Cannot emulate %02x\n", c->b);
3427318f 2699 c->eip = saved_eip;
6aa8b732
AK		 2700 return -1;
2701}
Linux 6.x block layer and io_uring tree(s)