projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
KVM: x86 emulator: Rename 'cr2' to 'memop'
[deliverable/linux.git] / drivers / kvm / x86_emulate.c
CommitLineData
6aa8b732
AK		 1/******************************************************************************
2 * x86_emulate.c
3 *
4 * Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
5 *
6 * Copyright (c) 2005 Keir Fraser
7 *
8 * Linux coding style, mod r/m decoder, segment base fixes, real-mode
dcc0766b 9 * privileged instructions:
6aa8b732
AK		 10 *
11 * Copyright (C) 2006 Qumranet
12 *
13 * Avi Kivity <avi@qumranet.com>
14 * Yaniv Kamay <yaniv@qumranet.com>
15 *
16 * This work is licensed under the terms of the GNU GPL, version 2. See
17 * the COPYING file in the top-level directory.
18 *
19 * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
20 */
21
22#ifndef __KERNEL__
23#include <stdio.h>
24#include <stdint.h>
25#include <public/xen.h>
d77c26fc 26#define DPRINTF(_f, _a ...) printf(_f , ## _a)
6aa8b732
AK		 27#else
28#include "kvm.h"
34c16eec 29#include "x86.h"
6aa8b732
AK		 30#define DPRINTF(x...) do {} while (0)
31#endif
32#include "x86_emulate.h"
33#include <linux/module.h>
34
35/*
36 * Opcode effective-address decode tables.
37 * Note that we only emulate instructions that have at least one memory
38 * operand (excluding implicit stack references). We assume that stack
39 * references and instruction fetches will never occur in special memory
40 * areas that require emulation. So, for example, 'mov <imm>,<reg>' need
41 * not be handled.
42 */
43
44/* Operand sizes: 8-bit operands or specified/overridden size. */
45#define ByteOp (1<<0) /* 8-bit operands. */
46/* Destination operand type. */
47#define ImplicitOps (1<<1) /* Implicit in opcode. No generic decode. */
48#define DstReg (2<<1) /* Register operand. */
49#define DstMem (3<<1) /* Memory operand. */
50#define DstMask (3<<1)
51/* Source operand type. */
52#define SrcNone (0<<3) /* No source operand. */
53#define SrcImplicit (0<<3) /* Source operand is implicit in the opcode. */
54#define SrcReg (1<<3) /* Register operand. */
55#define SrcMem (2<<3) /* Memory operand. */
56#define SrcMem16 (3<<3) /* Memory operand (16-bit). */
57#define SrcMem32 (4<<3) /* Memory operand (32-bit). */
58#define SrcImm (5<<3) /* Immediate operand. */
59#define SrcImmByte (6<<3) /* 8-bit sign-extended immediate operand. */
60#define SrcMask (7<<3)
61/* Generic ModRM decode. */
62#define ModRM (1<<6)
63/* Destination is only written; never read. */
64#define Mov (1<<7)
038e51de 65#define BitOp (1<<8)
c7e75a3d 66#define MemAbs (1<<9) /* Memory operand is absolute displacement */
6aa8b732 67
c7e75a3d 68static u16 opcode_table[256] = {
6aa8b732
AK		 69 /* 0x00 - 0x07 */
70 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
71 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
72 0, 0, 0, 0,
73 /* 0x08 - 0x0F */
74 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
75 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
76 0, 0, 0, 0,
77 /* 0x10 - 0x17 */
78 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
79 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
80 0, 0, 0, 0,
81 /* 0x18 - 0x1F */
82 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
83 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
84 0, 0, 0, 0,
85 /* 0x20 - 0x27 */
86 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
87 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
19eb938e 88 SrcImmByte, SrcImm, 0, 0,
6aa8b732
AK		 89 /* 0x28 - 0x2F */
90 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
91 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
92 0, 0, 0, 0,
93 /* 0x30 - 0x37 */
94 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
95 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
96 0, 0, 0, 0,
97 /* 0x38 - 0x3F */
98 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
99 ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
100 0, 0, 0, 0,
d77a2507 101 /* 0x40 - 0x47 */
33615aa9 102 DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg,
d77a2507 103 /* 0x48 - 0x4F */
33615aa9 104 DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg,
7f0aaee0 105 /* 0x50 - 0x57 */
33615aa9 106 SrcReg, SrcReg, SrcReg, SrcReg, SrcReg, SrcReg, SrcReg, SrcReg,
7f0aaee0 107 /* 0x58 - 0x5F */
33615aa9 108 DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg,
7d316911 109 /* 0x60 - 0x67 */
6aa8b732 110 0, 0, 0, DstReg | SrcMem32 | ModRM | Mov /* movsxd (x86/64) */ ,
7d316911
NK		 111 0, 0, 0, 0,
112 /* 0x68 - 0x6F */
113 0, 0, ImplicitOps|Mov, 0,
e70669ab
LV		 114 SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps, /* insb, insw/insd */
115 SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps, /* outsb, outsw/outsd */
55bebde4
NK		 116 /* 0x70 - 0x77 */
117 ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
118 ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
119 /* 0x78 - 0x7F */
120 ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
121 ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
6aa8b732
AK		 122 /* 0x80 - 0x87 */
123 ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM,
124 ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImmByte | ModRM,
125 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
126 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
127 /* 0x88 - 0x8F */
128 ByteOp | DstMem | SrcReg | ModRM | Mov, DstMem | SrcReg | ModRM | Mov,
129 ByteOp | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
7e0b54b1 130 0, ModRM | DstReg, 0, DstMem | SrcNone | ModRM | Mov,
6aa8b732 131 /* 0x90 - 0x9F */
535eabcf 132 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ImplicitOps, ImplicitOps, 0, 0,
6aa8b732 133 /* 0xA0 - 0xA7 */
c7e75a3d
AK		 134 ByteOp | DstReg | SrcMem | Mov | MemAbs, DstReg | SrcMem | Mov | MemAbs,
135 ByteOp | DstMem | SrcReg | Mov | MemAbs, DstMem | SrcReg | Mov | MemAbs,
6aa8b732
AK		 136 ByteOp | ImplicitOps | Mov, ImplicitOps | Mov,
137 ByteOp | ImplicitOps, ImplicitOps,
138 /* 0xA8 - 0xAF */
139 0, 0, ByteOp | ImplicitOps | Mov, ImplicitOps | Mov,
140 ByteOp | ImplicitOps | Mov, ImplicitOps | Mov,
141 ByteOp | ImplicitOps, ImplicitOps,
142 /* 0xB0 - 0xBF */
143 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
144 /* 0xC0 - 0xC7 */
d9413cd7
NK		 145 ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImmByte | ModRM,
146 0, ImplicitOps, 0, 0,
147 ByteOp | DstMem | SrcImm | ModRM | Mov, DstMem | SrcImm | ModRM | Mov,
6aa8b732
AK		 148 /* 0xC8 - 0xCF */
149 0, 0, 0, 0, 0, 0, 0, 0,
150 /* 0xD0 - 0xD7 */
151 ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM,
152 ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM,
153 0, 0, 0, 0,
154 /* 0xD8 - 0xDF */
155 0, 0, 0, 0, 0, 0, 0, 0,
098c937b
NK		 156 /* 0xE0 - 0xE7 */
157 0, 0, 0, 0, 0, 0, 0, 0,
158 /* 0xE8 - 0xEF */
f6eed391 159 ImplicitOps, SrcImm|ImplicitOps, 0, SrcImmByte|ImplicitOps, 0, 0, 0, 0,
6aa8b732
AK		 160 /* 0xF0 - 0xF7 */
161 0, 0, 0, 0,
b284be57 162 ImplicitOps, ImplicitOps,
72d6e5a0 163 ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM,
6aa8b732 164 /* 0xF8 - 0xFF */
b284be57 165 ImplicitOps, 0, ImplicitOps, ImplicitOps,
6aa8b732
AK		 166 0, 0, ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM
167};
168
038e51de 169static u16 twobyte_table[256] = {
6aa8b732
AK		 170 /* 0x00 - 0x0F */
171 0, SrcMem | ModRM | DstReg, 0, 0, 0, 0, ImplicitOps, 0,
651a3e29 172 ImplicitOps, ImplicitOps, 0, 0, 0, ImplicitOps | ModRM, 0, 0,
6aa8b732
AK		 173 /* 0x10 - 0x1F */
174 0, 0, 0, 0, 0, 0, 0, 0, ImplicitOps | ModRM, 0, 0, 0, 0, 0, 0, 0,
175 /* 0x20 - 0x2F */
176 ModRM | ImplicitOps, ModRM, ModRM | ImplicitOps, ModRM, 0, 0, 0, 0,
177 0, 0, 0, 0, 0, 0, 0, 0,
178 /* 0x30 - 0x3F */
35f3f286 179 ImplicitOps, 0, ImplicitOps, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
6aa8b732
AK		 180 /* 0x40 - 0x47 */
181 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
182 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
183 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
184 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
185 /* 0x48 - 0x4F */
186 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
187 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
188 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
189 DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
190 /* 0x50 - 0x5F */
191 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
192 /* 0x60 - 0x6F */
193 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
194 /* 0x70 - 0x7F */
195 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
196 /* 0x80 - 0x8F */
bbe9abbd
NK		 197 ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
198 ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
199 ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
200 ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
6aa8b732
AK		 201 /* 0x90 - 0x9F */
202 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
203 /* 0xA0 - 0xA7 */
038e51de 204 0, 0, 0, DstMem | SrcReg | ModRM | BitOp, 0, 0, 0, 0,
6aa8b732 205 /* 0xA8 - 0xAF */
038e51de 206 0, 0, 0, DstMem | SrcReg | ModRM | BitOp, 0, 0, 0, 0,
6aa8b732
AK		 207 /* 0xB0 - 0xB7 */
208 ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, 0,
038e51de 209 DstMem | SrcReg | ModRM | BitOp,
6aa8b732
AK		 210 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov,
211 DstReg | SrcMem16 | ModRM | Mov,
212 /* 0xB8 - 0xBF */
038e51de 213 0, 0, DstMem | SrcImmByte | ModRM, DstMem | SrcReg | ModRM | BitOp,
6aa8b732
AK		 214 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov,
215 DstReg | SrcMem16 | ModRM | Mov,
216 /* 0xC0 - 0xCF */
a012e65a
SY		 217 0, 0, 0, DstMem | SrcReg | ModRM | Mov, 0, 0, 0, ImplicitOps | ModRM,
218 0, 0, 0, 0, 0, 0, 0, 0,
6aa8b732
AK		 219 /* 0xD0 - 0xDF */
220 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
221 /* 0xE0 - 0xEF */
222 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
223 /* 0xF0 - 0xFF */
224 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
225};
226
6aa8b732
AK		 227/* EFLAGS bit definitions. */
228#define EFLG_OF (1<<11)
229#define EFLG_DF (1<<10)
230#define EFLG_SF (1<<7)
231#define EFLG_ZF (1<<6)
232#define EFLG_AF (1<<4)
233#define EFLG_PF (1<<2)
234#define EFLG_CF (1<<0)
235
236/*
237 * Instruction emulation:
238 * Most instructions are emulated directly via a fragment of inline assembly
239 * code. This allows us to save/restore EFLAGS and thus very easily pick up
240 * any modified flags.
241 */
242
05b3e0c2 243#if defined(CONFIG_X86_64)
6aa8b732
AK		 244#define _LO32 "k" /* force 32-bit operand */
245#define _STK "%%rsp" /* stack pointer */
246#elif defined(__i386__)
247#define _LO32 "" /* force 32-bit operand */
248#define _STK "%%esp" /* stack pointer */
249#endif
250
251/*
252 * These EFLAGS bits are restored from saved value during emulation, and
253 * any changes are written back to the saved value after emulation.
254 */
255#define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF)
256
257/* Before executing instruction: restore necessary bits in EFLAGS. */
258#define _PRE_EFLAGS(_sav, _msk, _tmp) \
259 /* EFLAGS = (_sav & _msk) | (EFLAGS & ~_msk); */ \
260 "push %"_sav"; " \
261 "movl %"_msk",%"_LO32 _tmp"; " \
262 "andl %"_LO32 _tmp",("_STK"); " \
263 "pushf; " \
264 "notl %"_LO32 _tmp"; " \
265 "andl %"_LO32 _tmp",("_STK"); " \
266 "pop %"_tmp"; " \
267 "orl %"_LO32 _tmp",("_STK"); " \
268 "popf; " \
269 /* _sav &= ~msk; */ \
270 "movl %"_msk",%"_LO32 _tmp"; " \
271 "notl %"_LO32 _tmp"; " \
272 "andl %"_LO32 _tmp",%"_sav"; "
273
274/* After executing instruction: write-back necessary bits in EFLAGS. */
275#define _POST_EFLAGS(_sav, _msk, _tmp) \
276 /* _sav |= EFLAGS & _msk; */ \
277 "pushf; " \
278 "pop %"_tmp"; " \
279 "andl %"_msk",%"_LO32 _tmp"; " \
280 "orl %"_LO32 _tmp",%"_sav"; "
281
282/* Raw emulation: instruction has two explicit operands. */
283#define __emulate_2op_nobyte(_op,_src,_dst,_eflags,_wx,_wy,_lx,_ly,_qx,_qy) \
284 do { \
285 unsigned long _tmp; \
286 \
287 switch ((_dst).bytes) { \
288 case 2: \
289 __asm__ __volatile__ ( \
d77c26fc 290 _PRE_EFLAGS("0", "4", "2") \
6aa8b732 291 _op"w %"_wx"3,%1; " \
d77c26fc 292 _POST_EFLAGS("0", "4", "2") \
6aa8b732
AK		 293 : "=m" (_eflags), "=m" ((_dst).val), \
294 "=&r" (_tmp) \
d77c26fc 295 : _wy ((_src).val), "i" (EFLAGS_MASK)); \
6aa8b732
AK		 296 break; \
297 case 4: \
298 __asm__ __volatile__ ( \
d77c26fc 299 _PRE_EFLAGS("0", "4", "2") \
6aa8b732 300 _op"l %"_lx"3,%1; " \
d77c26fc 301 _POST_EFLAGS("0", "4", "2") \
6aa8b732
AK		 302 : "=m" (_eflags), "=m" ((_dst).val), \
303 "=&r" (_tmp) \
d77c26fc 304 : _ly ((_src).val), "i" (EFLAGS_MASK)); \
6aa8b732
AK		 305 break; \
306 case 8: \
307 __emulate_2op_8byte(_op, _src, _dst, \
308 _eflags, _qx, _qy); \
309 break; \
310 } \
311 } while (0)
312
313#define __emulate_2op(_op,_src,_dst,_eflags,_bx,_by,_wx,_wy,_lx,_ly,_qx,_qy) \
314 do { \
315 unsigned long _tmp; \
d77c26fc 316 switch ((_dst).bytes) { \
6aa8b732
AK		 317 case 1: \
318 __asm__ __volatile__ ( \
d77c26fc 319 _PRE_EFLAGS("0", "4", "2") \
6aa8b732 320 _op"b %"_bx"3,%1; " \
d77c26fc 321 _POST_EFLAGS("0", "4", "2") \
6aa8b732
AK		 322 : "=m" (_eflags), "=m" ((_dst).val), \
323 "=&r" (_tmp) \
d77c26fc 324 : _by ((_src).val), "i" (EFLAGS_MASK)); \
6aa8b732
AK		 325 break; \
326 default: \
327 __emulate_2op_nobyte(_op, _src, _dst, _eflags, \
328 _wx, _wy, _lx, _ly, _qx, _qy); \
329 break; \
330 } \
331 } while (0)
332
333/* Source operand is byte-sized and may be restricted to just %cl. */
334#define emulate_2op_SrcB(_op, _src, _dst, _eflags) \
335 __emulate_2op(_op, _src, _dst, _eflags, \
336 "b", "c", "b", "c", "b", "c", "b", "c")
337
338/* Source operand is byte, word, long or quad sized. */
339#define emulate_2op_SrcV(_op, _src, _dst, _eflags) \
340 __emulate_2op(_op, _src, _dst, _eflags, \
341 "b", "q", "w", "r", _LO32, "r", "", "r")
342
343/* Source operand is word, long or quad sized. */
344#define emulate_2op_SrcV_nobyte(_op, _src, _dst, _eflags) \
345 __emulate_2op_nobyte(_op, _src, _dst, _eflags, \
346 "w", "r", _LO32, "r", "", "r")
347
348/* Instruction has only one explicit operand (no source operand). */
349#define emulate_1op(_op, _dst, _eflags) \
350 do { \
351 unsigned long _tmp; \
352 \
d77c26fc 353 switch ((_dst).bytes) { \
6aa8b732
AK		 354 case 1: \
355 __asm__ __volatile__ ( \
d77c26fc 356 _PRE_EFLAGS("0", "3", "2") \
6aa8b732 357 _op"b %1; " \
d77c26fc 358 _POST_EFLAGS("0", "3", "2") \
6aa8b732
AK		 359 : "=m" (_eflags), "=m" ((_dst).val), \
360 "=&r" (_tmp) \
d77c26fc 361 : "i" (EFLAGS_MASK)); \
6aa8b732
AK		 362 break; \
363 case 2: \
364 __asm__ __volatile__ ( \
d77c26fc 365 _PRE_EFLAGS("0", "3", "2") \
6aa8b732 366 _op"w %1; " \
d77c26fc 367 _POST_EFLAGS("0", "3", "2") \
6aa8b732
AK		 368 : "=m" (_eflags), "=m" ((_dst).val), \
369 "=&r" (_tmp) \
d77c26fc 370 : "i" (EFLAGS_MASK)); \
6aa8b732
AK		 371 break; \
372 case 4: \
373 __asm__ __volatile__ ( \
d77c26fc 374 _PRE_EFLAGS("0", "3", "2") \
6aa8b732 375 _op"l %1; " \
d77c26fc 376 _POST_EFLAGS("0", "3", "2") \
6aa8b732
AK		 377 : "=m" (_eflags), "=m" ((_dst).val), \
378 "=&r" (_tmp) \
d77c26fc 379 : "i" (EFLAGS_MASK)); \
6aa8b732
AK		 380 break; \
381 case 8: \
382 __emulate_1op_8byte(_op, _dst, _eflags); \
383 break; \
384 } \
385 } while (0)
386
387/* Emulate an instruction with quadword operands (x86/64 only). */
05b3e0c2 388#if defined(CONFIG_X86_64)
6aa8b732
AK		 389#define __emulate_2op_8byte(_op, _src, _dst, _eflags, _qx, _qy) \
390 do { \
391 __asm__ __volatile__ ( \
d77c26fc 392 _PRE_EFLAGS("0", "4", "2") \
6aa8b732 393 _op"q %"_qx"3,%1; " \
d77c26fc 394 _POST_EFLAGS("0", "4", "2") \
6aa8b732 395 : "=m" (_eflags), "=m" ((_dst).val), "=&r" (_tmp) \
d77c26fc 396 : _qy ((_src).val), "i" (EFLAGS_MASK)); \
6aa8b732
AK		 397 } while (0)
398
399#define __emulate_1op_8byte(_op, _dst, _eflags) \
400 do { \
401 __asm__ __volatile__ ( \
d77c26fc 402 _PRE_EFLAGS("0", "3", "2") \
6aa8b732 403 _op"q %1; " \
d77c26fc 404 _POST_EFLAGS("0", "3", "2") \
6aa8b732 405 : "=m" (_eflags), "=m" ((_dst).val), "=&r" (_tmp) \
d77c26fc 406 : "i" (EFLAGS_MASK)); \
6aa8b732
AK		 407 } while (0)
408
409#elif defined(__i386__)
410#define __emulate_2op_8byte(_op, _src, _dst, _eflags, _qx, _qy)
411#define __emulate_1op_8byte(_op, _dst, _eflags)
412#endif /* __i386__ */
413
414/* Fetch next part of the instruction being emulated. */
415#define insn_fetch(_type, _size, _eip) \
416({ unsigned long _x; \
62266869 417 rc = do_insn_fetch(ctxt, ops, (_eip), &_x, (_size)); \
d77c26fc 418 if (rc != 0) \
6aa8b732
AK		 419 goto done; \
420 (_eip) += (_size); \
421 (_type)_x; \
422})
423
424/* Access/update address held in a register, based on addressing mode. */
e70669ab 425#define address_mask(reg) \
e4e03ded
LV		 426 ((c->ad_bytes == sizeof(unsigned long)) ? \
427 (reg) : ((reg) & ((1UL << (c->ad_bytes << 3)) - 1)))
6aa8b732 428#define register_address(base, reg) \
e70669ab 429 ((base) + address_mask(reg))
6aa8b732
AK		 430#define register_address_increment(reg, inc) \
431 do { \
432 /* signed type ensures sign extension to long */ \
433 int _inc = (inc); \
e4e03ded 434 if (c->ad_bytes == sizeof(unsigned long)) \
6aa8b732
AK		 435 (reg) += _inc; \
436 else \
e4e03ded
LV		 437 (reg) = ((reg) & \
438 ~((1UL << (c->ad_bytes << 3)) - 1)) | \
439 (((reg) + _inc) & \
440 ((1UL << (c->ad_bytes << 3)) - 1)); \
6aa8b732
AK		 441 } while (0)
442
098c937b
NK		 443#define JMP_REL(rel) \
444 do { \
e4e03ded 445 register_address_increment(c->eip, rel); \
098c937b
NK		 446 } while (0)
447
62266869
AK		 448static int do_fetch_insn_byte(struct x86_emulate_ctxt *ctxt,
449 struct x86_emulate_ops *ops,
450 unsigned long linear, u8 *dest)
451{
452 struct fetch_cache *fc = &ctxt->decode.fetch;
453 int rc;
454 int size;
455
456 if (linear < fc->start || linear >= fc->end) {
457 size = min(15UL, PAGE_SIZE - offset_in_page(linear));
458 rc = ops->read_std(linear, fc->data, size, ctxt->vcpu);
459 if (rc)
460 return rc;
461 fc->start = linear;
462 fc->end = linear + size;
463 }
464 *dest = fc->data[linear - fc->start];
465 return 0;
466}
467
468static int do_insn_fetch(struct x86_emulate_ctxt *ctxt,
469 struct x86_emulate_ops *ops,
470 unsigned long eip, void *dest, unsigned size)
471{
472 int rc = 0;
473
474 eip += ctxt->cs_base;
475 while (size--) {
476 rc = do_fetch_insn_byte(ctxt, ops, eip++, dest++);
477 if (rc)
478 return rc;
479 }
480 return 0;
481}
482
1e3c5cb0
RR		 483/*
484 * Given the 'reg' portion of a ModRM byte, and a register block, return a
485 * pointer into the block that addresses the relevant register.
486 * @highbyte_regs specifies whether to decode AH,CH,DH,BH.
487 */
488static void *decode_register(u8 modrm_reg, unsigned long *regs,
489 int highbyte_regs)
6aa8b732
AK		 490{
491 void *p;
492
493 p = &regs[modrm_reg];
494 if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8)
495 p = (unsigned char *)&regs[modrm_reg & 3] + 1;
496 return p;
497}
498
499static int read_descriptor(struct x86_emulate_ctxt *ctxt,
500 struct x86_emulate_ops *ops,
501 void *ptr,
502 u16 *size, unsigned long *address, int op_bytes)
503{
504 int rc;
505
506 if (op_bytes == 2)
507 op_bytes = 3;
508 *address = 0;
cebff02b
LV		 509 rc = ops->read_std((unsigned long)ptr, (unsigned long *)size, 2,
510 ctxt->vcpu);
6aa8b732
AK		 511 if (rc)
512 return rc;
cebff02b
LV		 513 rc = ops->read_std((unsigned long)ptr + 2, address, op_bytes,
514 ctxt->vcpu);
6aa8b732
AK		 515 return rc;
516}
517
bbe9abbd
NK		 518static int test_cc(unsigned int condition, unsigned int flags)
519{
520 int rc = 0;
521
522 switch ((condition & 15) >> 1) {
523 case 0: /* o */
524 rc |= (flags & EFLG_OF);
525 break;
526 case 1: /* b/c/nae */
527 rc |= (flags & EFLG_CF);
528 break;
529 case 2: /* z/e */
530 rc |= (flags & EFLG_ZF);
531 break;
532 case 3: /* be/na */
533 rc |= (flags & (EFLG_CF|EFLG_ZF));
534 break;
535 case 4: /* s */
536 rc |= (flags & EFLG_SF);
537 break;
538 case 5: /* p/pe */
539 rc |= (flags & EFLG_PF);
540 break;
541 case 7: /* le/ng */
542 rc |= (flags & EFLG_ZF);
543 /* fall through */
544 case 6: /* l/nge */
545 rc |= (!(flags & EFLG_SF) != !(flags & EFLG_OF));
546 break;
547 }
548
549 /* Odd condition identifiers (lsb == 1) have inverted sense. */
550 return (!!rc ^ (condition & 1));
551}
552
3c118e24
AK		 553static void decode_register_operand(struct operand *op,
554 struct decode_cache *c,
3c118e24
AK		 555 int inhibit_bytereg)
556{
33615aa9 557 unsigned reg = c->modrm_reg;
9f1ef3f8 558 int highbyte_regs = c->rex_prefix == 0;
33615aa9
AK		 559
560 if (!(c->d & ModRM))
561 reg = (c->b & 7) | ((c->rex_prefix & 1) << 3);
3c118e24
AK		 562 op->type = OP_REG;
563 if ((c->d & ByteOp) && !inhibit_bytereg) {
33615aa9 564 op->ptr = decode_register(reg, c->regs, highbyte_regs);
3c118e24
AK		 565 op->val = *(u8 *)op->ptr;
566 op->bytes = 1;
567 } else {
33615aa9 568 op->ptr = decode_register(reg, c->regs, 0);
3c118e24
AK		 569 op->bytes = c->op_bytes;
570 switch (op->bytes) {
571 case 2:
572 op->val = *(u16 *)op->ptr;
573 break;
574 case 4:
575 op->val = *(u32 *)op->ptr;
576 break;
577 case 8:
578 op->val = *(u64 *) op->ptr;
579 break;
580 }
581 }
582 op->orig_val = op->val;
583}
584
1c73ef66
AK		 585static int decode_modrm(struct x86_emulate_ctxt *ctxt,
586 struct x86_emulate_ops *ops)
587{
588 struct decode_cache *c = &ctxt->decode;
589 u8 sib;
590 int index_reg = 0, base_reg = 0, scale, rip_relative = 0;
591 int rc = 0;
592
593 if (c->rex_prefix) {
594 c->modrm_reg = (c->rex_prefix & 4) << 1; /* REX.R */
595 index_reg = (c->rex_prefix & 2) << 2; /* REX.X */
596 c->modrm_rm = base_reg = (c->rex_prefix & 1) << 3; /* REG.B */
597 }
598
599 c->modrm = insn_fetch(u8, 1, c->eip);
600 c->modrm_mod |= (c->modrm & 0xc0) >> 6;
601 c->modrm_reg |= (c->modrm & 0x38) >> 3;
602 c->modrm_rm |= (c->modrm & 0x07);
603 c->modrm_ea = 0;
604 c->use_modrm_ea = 1;
605
606 if (c->modrm_mod == 3) {
607 c->modrm_val = *(unsigned long *)
608 decode_register(c->modrm_rm, c->regs, c->d & ByteOp);
609 return rc;
610 }
611
612 if (c->ad_bytes == 2) {
613 unsigned bx = c->regs[VCPU_REGS_RBX];
614 unsigned bp = c->regs[VCPU_REGS_RBP];
615 unsigned si = c->regs[VCPU_REGS_RSI];
616 unsigned di = c->regs[VCPU_REGS_RDI];
617
618 /* 16-bit ModR/M decode. */
619 switch (c->modrm_mod) {
620 case 0:
621 if (c->modrm_rm == 6)
622 c->modrm_ea += insn_fetch(u16, 2, c->eip);
623 break;
624 case 1:
625 c->modrm_ea += insn_fetch(s8, 1, c->eip);
626 break;
627 case 2:
628 c->modrm_ea += insn_fetch(u16, 2, c->eip);
629 break;
630 }
631 switch (c->modrm_rm) {
632 case 0:
633 c->modrm_ea += bx + si;
634 break;
635 case 1:
636 c->modrm_ea += bx + di;
637 break;
638 case 2:
639 c->modrm_ea += bp + si;
640 break;
641 case 3:
642 c->modrm_ea += bp + di;
643 break;
644 case 4:
645 c->modrm_ea += si;
646 break;
647 case 5:
648 c->modrm_ea += di;
649 break;
650 case 6:
651 if (c->modrm_mod != 0)
652 c->modrm_ea += bp;
653 break;
654 case 7:
655 c->modrm_ea += bx;
656 break;
657 }
658 if (c->modrm_rm == 2 || c->modrm_rm == 3 ||
659 (c->modrm_rm == 6 && c->modrm_mod != 0))
660 if (!c->override_base)
661 c->override_base = &ctxt->ss_base;
662 c->modrm_ea = (u16)c->modrm_ea;
663 } else {
664 /* 32/64-bit ModR/M decode. */
665 switch (c->modrm_rm) {
666 case 4:
667 case 12:
668 sib = insn_fetch(u8, 1, c->eip);
669 index_reg |= (sib >> 3) & 7;
670 base_reg |= sib & 7;
671 scale = sib >> 6;
672
673 switch (base_reg) {
674 case 5:
675 if (c->modrm_mod != 0)
676 c->modrm_ea += c->regs[base_reg];
677 else
678 c->modrm_ea +=
679 insn_fetch(s32, 4, c->eip);
680 break;
681 default:
682 c->modrm_ea += c->regs[base_reg];
683 }
684 switch (index_reg) {
685 case 4:
686 break;
687 default:
688 c->modrm_ea += c->regs[index_reg] << scale;
689 }
690 break;
691 case 5:
692 if (c->modrm_mod != 0)
693 c->modrm_ea += c->regs[c->modrm_rm];
694 else if (ctxt->mode == X86EMUL_MODE_PROT64)
695 rip_relative = 1;
696 break;
697 default:
698 c->modrm_ea += c->regs[c->modrm_rm];
699 break;
700 }
701 switch (c->modrm_mod) {
702 case 0:
703 if (c->modrm_rm == 5)
704 c->modrm_ea += insn_fetch(s32, 4, c->eip);
705 break;
706 case 1:
707 c->modrm_ea += insn_fetch(s8, 1, c->eip);
708 break;
709 case 2:
710 c->modrm_ea += insn_fetch(s32, 4, c->eip);
711 break;
712 }
713 }
714 if (rip_relative) {
715 c->modrm_ea += c->eip;
716 switch (c->d & SrcMask) {
717 case SrcImmByte:
718 c->modrm_ea += 1;
719 break;
720 case SrcImm:
721 if (c->d & ByteOp)
722 c->modrm_ea += 1;
723 else
724 if (c->op_bytes == 8)
725 c->modrm_ea += 4;
726 else
727 c->modrm_ea += c->op_bytes;
728 }
729 }
730done:
731 return rc;
732}
733
734static int decode_abs(struct x86_emulate_ctxt *ctxt,
735 struct x86_emulate_ops *ops)
736{
737 struct decode_cache *c = &ctxt->decode;
738 int rc = 0;
739
740 switch (c->ad_bytes) {
741 case 2:
742 c->modrm_ea = insn_fetch(u16, 2, c->eip);
743 break;
744 case 4:
745 c->modrm_ea = insn_fetch(u32, 4, c->eip);
746 break;
747 case 8:
748 c->modrm_ea = insn_fetch(u64, 8, c->eip);
749 break;
750 }
751done:
752 return rc;
753}
754
6aa8b732 755int
8b4caf66 756x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
6aa8b732 757{
e4e03ded 758 struct decode_cache *c = &ctxt->decode;
6aa8b732 759 int rc = 0;
6aa8b732 760 int mode = ctxt->mode;
f21b8bf4 761 int def_op_bytes, def_ad_bytes;
6aa8b732
AK		 762
763 /* Shadow copy of register state. Committed on successful emulation. */
6aa8b732 764
e4e03ded
LV		 765 memset(c, 0, sizeof(struct decode_cache));
766 c->eip = ctxt->vcpu->rip;
767 memcpy(c->regs, ctxt->vcpu->regs, sizeof c->regs);
6aa8b732
AK		 768
769 switch (mode) {
770 case X86EMUL_MODE_REAL:
771 case X86EMUL_MODE_PROT16:
f21b8bf4 772 def_op_bytes = def_ad_bytes = 2;
6aa8b732
AK		 773 break;
774 case X86EMUL_MODE_PROT32:
f21b8bf4 775 def_op_bytes = def_ad_bytes = 4;
6aa8b732 776 break;
05b3e0c2 777#ifdef CONFIG_X86_64
6aa8b732 778 case X86EMUL_MODE_PROT64:
f21b8bf4
AK		 779 def_op_bytes = 4;
780 def_ad_bytes = 8;
6aa8b732
AK		 781 break;
782#endif
783 default:
784 return -1;
785 }
786
f21b8bf4
AK		 787 c->op_bytes = def_op_bytes;
788 c->ad_bytes = def_ad_bytes;
789
6aa8b732 790 /* Legacy prefixes. */
b4c6abfe 791 for (;;) {
e4e03ded 792 switch (c->b = insn_fetch(u8, 1, c->eip)) {
6aa8b732 793 case 0x66: /* operand-size override */
f21b8bf4
AK		 794 /* switch between 2/4 bytes */
795 c->op_bytes = def_op_bytes ^ 6;
6aa8b732
AK		 796 break;
797 case 0x67: /* address-size override */
798 if (mode == X86EMUL_MODE_PROT64)
e4e03ded 799 /* switch between 4/8 bytes */
f21b8bf4 800 c->ad_bytes = def_ad_bytes ^ 12;
6aa8b732 801 else
e4e03ded 802 /* switch between 2/4 bytes */
f21b8bf4 803 c->ad_bytes = def_ad_bytes ^ 6;
6aa8b732
AK		 804 break;
805 case 0x2e: /* CS override */
e4e03ded 806 c->override_base = &ctxt->cs_base;
6aa8b732
AK		 807 break;
808 case 0x3e: /* DS override */
e4e03ded 809 c->override_base = &ctxt->ds_base;
6aa8b732
AK		 810 break;
811 case 0x26: /* ES override */
e4e03ded 812 c->override_base = &ctxt->es_base;
6aa8b732
AK		 813 break;
814 case 0x64: /* FS override */
e4e03ded 815 c->override_base = &ctxt->fs_base;
6aa8b732
AK		 816 break;
817 case 0x65: /* GS override */
e4e03ded 818 c->override_base = &ctxt->gs_base;
6aa8b732
AK		 819 break;
820 case 0x36: /* SS override */
e4e03ded 821 c->override_base = &ctxt->ss_base;
6aa8b732 822 break;
b4c6abfe
LV		 823 case 0x40 ... 0x4f: /* REX */
824 if (mode != X86EMUL_MODE_PROT64)
825 goto done_prefixes;
33615aa9 826 c->rex_prefix = c->b;
b4c6abfe 827 continue;
6aa8b732 828 case 0xf0: /* LOCK */
e4e03ded 829 c->lock_prefix = 1;
6aa8b732 830 break;
ae6200ba 831 case 0xf2: /* REPNE/REPNZ */
90e0a28f
GT		 832 c->rep_prefix = REPNE_PREFIX;
833 break;
6aa8b732 834 case 0xf3: /* REP/REPE/REPZ */
90e0a28f 835 c->rep_prefix = REPE_PREFIX;
6aa8b732 836 break;
6aa8b732
AK		 837 default:
838 goto done_prefixes;
839 }
b4c6abfe
LV		 840
841 /* Any legacy prefix after a REX prefix nullifies its effect. */
842
33615aa9 843 c->rex_prefix = 0;
6aa8b732
AK		 844 }
845
846done_prefixes:
847
848 /* REX prefix. */
1c73ef66 849 if (c->rex_prefix)
33615aa9 850 if (c->rex_prefix & 8)
e4e03ded 851 c->op_bytes = 8; /* REX.W */
6aa8b732
AK		 852
853 /* Opcode byte(s). */
e4e03ded
LV		 854 c->d = opcode_table[c->b];
855 if (c->d == 0) {
6aa8b732 856 /* Two-byte opcode? */
e4e03ded
LV		 857 if (c->b == 0x0f) {
858 c->twobyte = 1;
859 c->b = insn_fetch(u8, 1, c->eip);
860 c->d = twobyte_table[c->b];
6aa8b732
AK		 861 }
862
863 /* Unrecognised? */
8b4caf66
LV		 864 if (c->d == 0) {
865 DPRINTF("Cannot emulate %02x\n", c->b);
866 return -1;
867 }
6aa8b732
AK		 868 }
869
870 /* ModRM and SIB bytes. */
1c73ef66
AK		 871 if (c->d & ModRM)
872 rc = decode_modrm(ctxt, ops);
873 else if (c->d & MemAbs)
874 rc = decode_abs(ctxt, ops);
875 if (rc)
876 goto done;
6aa8b732 877
c7e75a3d
AK		 878 if (!c->override_base)
879 c->override_base = &ctxt->ds_base;
880 if (mode == X86EMUL_MODE_PROT64 &&
881 c->override_base != &ctxt->fs_base &&
882 c->override_base != &ctxt->gs_base)
883 c->override_base = NULL;
884
885 if (c->override_base)
886 c->modrm_ea += *c->override_base;
887
888 if (c->ad_bytes != 8)
889 c->modrm_ea = (u32)c->modrm_ea;
6aa8b732
AK		 890 /*
891 * Decode and fetch the source operand: register, memory
892 * or immediate.
893 */
e4e03ded 894 switch (c->d & SrcMask) {
6aa8b732
AK		 895 case SrcNone:
896 break;
897 case SrcReg:
9f1ef3f8 898 decode_register_operand(&c->src, c, 0);
6aa8b732
AK		 899 break;
900 case SrcMem16:
e4e03ded 901 c->src.bytes = 2;
6aa8b732
AK		 902 goto srcmem_common;
903 case SrcMem32:
e4e03ded 904 c->src.bytes = 4;
6aa8b732
AK		 905 goto srcmem_common;
906 case SrcMem:
e4e03ded
LV		 907 c->src.bytes = (c->d & ByteOp) ? 1 :
908 c->op_bytes;
b85b9ee9 909 /* Don't fetch the address for invlpg: it could be unmapped. */
d77c26fc 910 if (c->twobyte && c->b == 0x01 && c->modrm_reg == 7)
b85b9ee9 911 break;
d77c26fc 912 srcmem_common:
4e62417b
AJ		 913 /*
914 * For instructions with a ModR/M byte, switch to register
915 * access if Mod = 3.
916 */
e4e03ded
LV		 917 if ((c->d & ModRM) && c->modrm_mod == 3) {
918 c->src.type = OP_REG;
4e62417b
AJ		 919 break;
920 }
e4e03ded 921 c->src.type = OP_MEM;
6aa8b732
AK		 922 break;
923 case SrcImm:
e4e03ded
LV		 924 c->src.type = OP_IMM;
925 c->src.ptr = (unsigned long *)c->eip;
926 c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
927 if (c->src.bytes == 8)
928 c->src.bytes = 4;
6aa8b732 929 /* NB. Immediates are sign-extended as necessary. */
e4e03ded 930 switch (c->src.bytes) {
6aa8b732 931 case 1:
e4e03ded 932 c->src.val = insn_fetch(s8, 1, c->eip);
6aa8b732
AK		 933 break;
934 case 2:
e4e03ded 935 c->src.val = insn_fetch(s16, 2, c->eip);
6aa8b732
AK		 936 break;
937 case 4:
e4e03ded 938 c->src.val = insn_fetch(s32, 4, c->eip);
6aa8b732
AK		 939 break;
940 }
941 break;
942 case SrcImmByte:
e4e03ded
LV		 943 c->src.type = OP_IMM;
944 c->src.ptr = (unsigned long *)c->eip;
945 c->src.bytes = 1;
946 c->src.val = insn_fetch(s8, 1, c->eip);
6aa8b732
AK		 947 break;
948 }
949
038e51de 950 /* Decode and fetch the destination operand: register or memory. */
e4e03ded 951 switch (c->d & DstMask) {
038e51de
AK		 952 case ImplicitOps:
953 /* Special instructions do their own operand decoding. */
8b4caf66 954 return 0;
038e51de 955 case DstReg:
9f1ef3f8 956 decode_register_operand(&c->dst, c,
3c118e24 957 c->twobyte && (c->b == 0xb6 || c->b == 0xb7));
038e51de
AK		 958 break;
959 case DstMem:
e4e03ded
LV		 960 if ((c->d & ModRM) && c->modrm_mod == 3) {
961 c->dst.type = OP_REG;
4e62417b
AJ		 962 break;
963 }
8b4caf66
LV		 964 c->dst.type = OP_MEM;
965 break;
966 }
967
968done:
969 return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0;
970}
971
8cdbd2c9
LV		 972static inline void emulate_push(struct x86_emulate_ctxt *ctxt)
973{
974 struct decode_cache *c = &ctxt->decode;
975
976 c->dst.type = OP_MEM;
977 c->dst.bytes = c->op_bytes;
978 c->dst.val = c->src.val;
979 register_address_increment(c->regs[VCPU_REGS_RSP], -c->op_bytes);
980 c->dst.ptr = (void *) register_address(ctxt->ss_base,
981 c->regs[VCPU_REGS_RSP]);
982}
983
984static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt,
985 struct x86_emulate_ops *ops)
986{
987 struct decode_cache *c = &ctxt->decode;
988 int rc;
989
990 /* 64-bit mode: POP always pops a 64-bit operand. */
991
992 if (ctxt->mode == X86EMUL_MODE_PROT64)
993 c->dst.bytes = 8;
994
995 rc = ops->read_std(register_address(ctxt->ss_base,
996 c->regs[VCPU_REGS_RSP]),
997 &c->dst.val, c->dst.bytes, ctxt->vcpu);
998 if (rc != 0)
999 return rc;
1000
1001 register_address_increment(c->regs[VCPU_REGS_RSP], c->dst.bytes);
1002
1003 return 0;
1004}
1005
05f086f8 1006static inline void emulate_grp2(struct x86_emulate_ctxt *ctxt)
8cdbd2c9 1007{
05f086f8 1008 struct decode_cache *c = &ctxt->decode;
8cdbd2c9
LV		 1009 switch (c->modrm_reg) {
1010 case 0: /* rol */
05f086f8 1011 emulate_2op_SrcB("rol", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1012 break;
1013 case 1: /* ror */
05f086f8 1014 emulate_2op_SrcB("ror", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1015 break;
1016 case 2: /* rcl */
05f086f8 1017 emulate_2op_SrcB("rcl", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1018 break;
1019 case 3: /* rcr */
05f086f8 1020 emulate_2op_SrcB("rcr", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1021 break;
1022 case 4: /* sal/shl */
1023 case 6: /* sal/shl */
05f086f8 1024 emulate_2op_SrcB("sal", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1025 break;
1026 case 5: /* shr */
05f086f8 1027 emulate_2op_SrcB("shr", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1028 break;
1029 case 7: /* sar */
05f086f8 1030 emulate_2op_SrcB("sar", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1031 break;
1032 }
1033}
1034
1035static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
05f086f8 1036 struct x86_emulate_ops *ops)
8cdbd2c9
LV		 1037{
1038 struct decode_cache *c = &ctxt->decode;
1039 int rc = 0;
1040
1041 switch (c->modrm_reg) {
1042 case 0 ... 1: /* test */
1043 /*
1044 * Special case in Grp3: test has an immediate
1045 * source operand.
1046 */
1047 c->src.type = OP_IMM;
1048 c->src.ptr = (unsigned long *)c->eip;
1049 c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
1050 if (c->src.bytes == 8)
1051 c->src.bytes = 4;
1052 switch (c->src.bytes) {
1053 case 1:
1054 c->src.val = insn_fetch(s8, 1, c->eip);
1055 break;
1056 case 2:
1057 c->src.val = insn_fetch(s16, 2, c->eip);
1058 break;
1059 case 4:
1060 c->src.val = insn_fetch(s32, 4, c->eip);
1061 break;
1062 }
05f086f8 1063 emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags);
8cdbd2c9
LV		 1064 break;
1065 case 2: /* not */
1066 c->dst.val = ~c->dst.val;
1067 break;
1068 case 3: /* neg */
05f086f8 1069 emulate_1op("neg", c->dst, ctxt->eflags);
8cdbd2c9
LV		 1070 break;
1071 default:
1072 DPRINTF("Cannot emulate %02x\n", c->b);
1073 rc = X86EMUL_UNHANDLEABLE;
1074 break;
1075 }
1076done:
1077 return rc;
1078}
1079
1080static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
a01af5ec 1081 struct x86_emulate_ops *ops)
8cdbd2c9
LV		 1082{
1083 struct decode_cache *c = &ctxt->decode;
1084 int rc;
1085
1086 switch (c->modrm_reg) {
1087 case 0: /* inc */
05f086f8 1088 emulate_1op("inc", c->dst, ctxt->eflags);
8cdbd2c9
LV		 1089 break;
1090 case 1: /* dec */
05f086f8 1091 emulate_1op("dec", c->dst, ctxt->eflags);
8cdbd2c9
LV		 1092 break;
1093 case 4: /* jmp abs */
1094 if (c->b == 0xff)
1095 c->eip = c->dst.val;
1096 else {
1097 DPRINTF("Cannot emulate %02x\n", c->b);
1098 return X86EMUL_UNHANDLEABLE;
1099 }
1100 break;
1101 case 6: /* push */
1102
1103 /* 64-bit mode: PUSH always pushes a 64-bit operand. */
1104
1105 if (ctxt->mode == X86EMUL_MODE_PROT64) {
1106 c->dst.bytes = 8;
1107 rc = ops->read_std((unsigned long)c->dst.ptr,
1108 &c->dst.val, 8, ctxt->vcpu);
1109 if (rc != 0)
1110 return rc;
1111 }
1112 register_address_increment(c->regs[VCPU_REGS_RSP],
1113 -c->dst.bytes);
1114 rc = ops->write_emulated(register_address(ctxt->ss_base,
1115 c->regs[VCPU_REGS_RSP]), &c->dst.val,
1116 c->dst.bytes, ctxt->vcpu);
1117 if (rc != 0)
1118 return rc;
a01af5ec 1119 c->dst.type = OP_NONE;
8cdbd2c9
LV		 1120 break;
1121 default:
1122 DPRINTF("Cannot emulate %02x\n", c->b);
1123 return X86EMUL_UNHANDLEABLE;
1124 }
1125 return 0;
1126}
1127
1128static inline int emulate_grp9(struct x86_emulate_ctxt *ctxt,
1129 struct x86_emulate_ops *ops,
e8d8d7fe 1130 unsigned long memop)
8cdbd2c9
LV		 1131{
1132 struct decode_cache *c = &ctxt->decode;
1133 u64 old, new;
1134 int rc;
1135
e8d8d7fe 1136 rc = ops->read_emulated(memop, &old, 8, ctxt->vcpu);
8cdbd2c9
LV		 1137 if (rc != 0)
1138 return rc;
1139
1140 if (((u32) (old >> 0) != (u32) c->regs[VCPU_REGS_RAX]) ||
1141 ((u32) (old >> 32) != (u32) c->regs[VCPU_REGS_RDX])) {
1142
1143 c->regs[VCPU_REGS_RAX] = (u32) (old >> 0);
1144 c->regs[VCPU_REGS_RDX] = (u32) (old >> 32);
05f086f8 1145 ctxt->eflags &= ~EFLG_ZF;
8cdbd2c9
LV		 1146
1147 } else {
1148 new = ((u64)c->regs[VCPU_REGS_RCX] << 32) |
1149 (u32) c->regs[VCPU_REGS_RBX];
1150
e8d8d7fe 1151 rc = ops->cmpxchg_emulated(memop, &old, &new, 8, ctxt->vcpu);
8cdbd2c9
LV		 1152 if (rc != 0)
1153 return rc;
05f086f8 1154 ctxt->eflags |= EFLG_ZF;
8cdbd2c9
LV		 1155 }
1156 return 0;
1157}
1158
1159static inline int writeback(struct x86_emulate_ctxt *ctxt,
1160 struct x86_emulate_ops *ops)
1161{
1162 int rc;
1163 struct decode_cache *c = &ctxt->decode;
1164
1165 switch (c->dst.type) {
1166 case OP_REG:
1167 /* The 4-byte case *is* correct:
1168 * in 64-bit mode we zero-extend.
1169 */
1170 switch (c->dst.bytes) {
1171 case 1:
1172 *(u8 *)c->dst.ptr = (u8)c->dst.val;
1173 break;
1174 case 2:
1175 *(u16 *)c->dst.ptr = (u16)c->dst.val;
1176 break;
1177 case 4:
1178 *c->dst.ptr = (u32)c->dst.val;
1179 break; /* 64b: zero-ext */
1180 case 8:
1181 *c->dst.ptr = c->dst.val;
1182 break;
1183 }
1184 break;
1185 case OP_MEM:
1186 if (c->lock_prefix)
1187 rc = ops->cmpxchg_emulated(
1188 (unsigned long)c->dst.ptr,
1189 &c->dst.orig_val,
1190 &c->dst.val,
1191 c->dst.bytes,
1192 ctxt->vcpu);
1193 else
1194 rc = ops->write_emulated(
1195 (unsigned long)c->dst.ptr,
1196 &c->dst.val,
1197 c->dst.bytes,
1198 ctxt->vcpu);
1199 if (rc != 0)
1200 return rc;
a01af5ec
LV		 1201 break;
1202 case OP_NONE:
1203 /* no writeback */
1204 break;
8cdbd2c9
LV		 1205 default:
1206 break;
1207 }
1208 return 0;
1209}
1210
8b4caf66 1211int
1be3aa47 1212x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
8b4caf66 1213{
e8d8d7fe 1214 unsigned long memop = 0;
8b4caf66 1215 u64 msr_data;
3427318f 1216 unsigned long saved_eip = 0;
8b4caf66 1217 struct decode_cache *c = &ctxt->decode;
1be3aa47 1218 int rc = 0;
8b4caf66 1219
3427318f
LV		 1220 /* Shadow copy of register state. Committed on successful emulation.
1221 * NOTE: we can copy them from vcpu as x86_decode_insn() doesn't
1222 * modify them.
1223 */
1224
1225 memcpy(c->regs, ctxt->vcpu->regs, sizeof c->regs);
1226 saved_eip = c->eip;
1227
c7e75a3d 1228 if (((c->d & ModRM) && (c->modrm_mod != 3)) || (c->d & MemAbs))
e8d8d7fe 1229 memop = c->modrm_ea;
8b4caf66
LV		 1230
1231 if (c->src.type == OP_MEM) {
e8d8d7fe 1232 c->src.ptr = (unsigned long *)memop;
8b4caf66 1233 c->src.val = 0;
d77c26fc
MD		 1234 rc = ops->read_emulated((unsigned long)c->src.ptr,
1235 &c->src.val,
1236 c->src.bytes,
1237 ctxt->vcpu);
1238 if (rc != 0)
8b4caf66
LV		 1239 goto done;
1240 c->src.orig_val = c->src.val;
1241 }
1242
1243 if ((c->d & DstMask) == ImplicitOps)
1244 goto special_insn;
1245
1246
1247 if (c->dst.type == OP_MEM) {
e8d8d7fe 1248 c->dst.ptr = (unsigned long *)memop;
8b4caf66
LV		 1249 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
1250 c->dst.val = 0;
e4e03ded
LV		 1251 if (c->d & BitOp) {
1252 unsigned long mask = ~(c->dst.bytes * 8 - 1);
df513e2c 1253
e4e03ded
LV		 1254 c->dst.ptr = (void *)c->dst.ptr +
1255 (c->src.val & mask) / 8;
038e51de 1256 }
e4e03ded
LV		 1257 if (!(c->d & Mov) &&
1258 /* optimisation - avoid slow emulated read */
1259 ((rc = ops->read_emulated((unsigned long)c->dst.ptr,
1260 &c->dst.val,
1261 c->dst.bytes, ctxt->vcpu)) != 0))
038e51de 1262 goto done;
038e51de 1263 }
e4e03ded 1264 c->dst.orig_val = c->dst.val;
038e51de 1265
e4e03ded 1266 if (c->twobyte)
6aa8b732
AK		 1267 goto twobyte_insn;
1268
e4e03ded 1269 switch (c->b) {
6aa8b732
AK		 1270 case 0x00 ... 0x05:
1271 add: /* add */
05f086f8 1272 emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags);
6aa8b732
AK		 1273 break;
1274 case 0x08 ... 0x0d:
1275 or: /* or */
05f086f8 1276 emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags);
6aa8b732
AK		 1277 break;
1278 case 0x10 ... 0x15:
1279 adc: /* adc */
05f086f8 1280 emulate_2op_SrcV("adc", c->src, c->dst, ctxt->eflags);
6aa8b732
AK		 1281 break;
1282 case 0x18 ... 0x1d:
1283 sbb: /* sbb */
05f086f8 1284 emulate_2op_SrcV("sbb", c->src, c->dst, ctxt->eflags);
6aa8b732 1285 break;
19eb938e 1286 case 0x20 ... 0x23:
6aa8b732 1287 and: /* and */
05f086f8 1288 emulate_2op_SrcV("and", c->src, c->dst, ctxt->eflags);
6aa8b732 1289 break;
19eb938e 1290 case 0x24: /* and al imm8 */
e4e03ded
LV		 1291 c->dst.type = OP_REG;
1292 c->dst.ptr = &c->regs[VCPU_REGS_RAX];
1293 c->dst.val = *(u8 *)c->dst.ptr;
1294 c->dst.bytes = 1;
1295 c->dst.orig_val = c->dst.val;
19eb938e
NK		 1296 goto and;
1297 case 0x25: /* and ax imm16, or eax imm32 */
e4e03ded
LV		 1298 c->dst.type = OP_REG;
1299 c->dst.bytes = c->op_bytes;
1300 c->dst.ptr = &c->regs[VCPU_REGS_RAX];
1301 if (c->op_bytes == 2)
1302 c->dst.val = *(u16 *)c->dst.ptr;
19eb938e 1303 else
e4e03ded
LV		 1304 c->dst.val = *(u32 *)c->dst.ptr;
1305 c->dst.orig_val = c->dst.val;
19eb938e 1306 goto and;
6aa8b732
AK		 1307 case 0x28 ... 0x2d:
1308 sub: /* sub */
05f086f8 1309 emulate_2op_SrcV("sub", c->src, c->dst, ctxt->eflags);
6aa8b732
AK		 1310 break;
1311 case 0x30 ... 0x35:
1312 xor: /* xor */
05f086f8 1313 emulate_2op_SrcV("xor", c->src, c->dst, ctxt->eflags);
6aa8b732
AK		 1314 break;
1315 case 0x38 ... 0x3d:
1316 cmp: /* cmp */
05f086f8 1317 emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
6aa8b732 1318 break;
33615aa9
AK		 1319 case 0x40 ... 0x47: /* inc r16/r32 */
1320 emulate_1op("inc", c->dst, ctxt->eflags);
1321 break;
1322 case 0x48 ... 0x4f: /* dec r16/r32 */
1323 emulate_1op("dec", c->dst, ctxt->eflags);
1324 break;
1325 case 0x50 ... 0x57: /* push reg */
1326 c->dst.type = OP_MEM;
1327 c->dst.bytes = c->op_bytes;
1328 c->dst.val = c->src.val;
1329 register_address_increment(c->regs[VCPU_REGS_RSP],
1330 -c->op_bytes);
1331 c->dst.ptr = (void *) register_address(
1332 ctxt->ss_base, c->regs[VCPU_REGS_RSP]);
1333 break;
1334 case 0x58 ... 0x5f: /* pop reg */
1335 pop_instruction:
1336 if ((rc = ops->read_std(register_address(ctxt->ss_base,
1337 c->regs[VCPU_REGS_RSP]), c->dst.ptr,
1338 c->op_bytes, ctxt->vcpu)) != 0)
1339 goto done;
1340
1341 register_address_increment(c->regs[VCPU_REGS_RSP],
1342 c->op_bytes);
1343 c->dst.type = OP_NONE; /* Disable writeback. */
1344 break;
6aa8b732 1345 case 0x63: /* movsxd */
8b4caf66 1346 if (ctxt->mode != X86EMUL_MODE_PROT64)
6aa8b732 1347 goto cannot_emulate;
e4e03ded 1348 c->dst.val = (s32) c->src.val;
6aa8b732
AK		 1349 break;
1350 case 0x80 ... 0x83: /* Grp1 */
e4e03ded 1351 switch (c->modrm_reg) {
6aa8b732
AK		 1352 case 0:
1353 goto add;
1354 case 1:
1355 goto or;
1356 case 2:
1357 goto adc;
1358 case 3:
1359 goto sbb;
1360 case 4:
1361 goto and;
1362 case 5:
1363 goto sub;
1364 case 6:
1365 goto xor;
1366 case 7:
1367 goto cmp;
1368 }
1369 break;
1370 case 0x84 ... 0x85:
05f086f8 1371 emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags);
6aa8b732
AK		 1372 break;
1373 case 0x86 ... 0x87: /* xchg */
1374 /* Write back the register source. */
e4e03ded 1375 switch (c->dst.bytes) {
6aa8b732 1376 case 1:
e4e03ded 1377 *(u8 *) c->src.ptr = (u8) c->dst.val;
6aa8b732
AK		 1378 break;
1379 case 2:
e4e03ded 1380 *(u16 *) c->src.ptr = (u16) c->dst.val;
6aa8b732
AK		 1381 break;
1382 case 4:
e4e03ded 1383 *c->src.ptr = (u32) c->dst.val;
6aa8b732
AK		 1384 break; /* 64b reg: zero-extend */
1385 case 8:
e4e03ded 1386 *c->src.ptr = c->dst.val;
6aa8b732
AK		 1387 break;
1388 }
1389 /*
1390 * Write back the memory destination with implicit LOCK
1391 * prefix.
1392 */
e4e03ded
LV		 1393 c->dst.val = c->src.val;
1394 c->lock_prefix = 1;
6aa8b732 1395 break;
6aa8b732 1396 case 0x88 ... 0x8b: /* mov */
7de75248 1397 goto mov;
7e0b54b1 1398 case 0x8d: /* lea r16/r32, m */
e4e03ded 1399 c->dst.val = c->modrm_val;
7e0b54b1 1400 break;
6aa8b732 1401 case 0x8f: /* pop (sole member of Grp1a) */
8cdbd2c9
LV		 1402 rc = emulate_grp1a(ctxt, ops);
1403 if (rc != 0)
6aa8b732 1404 goto done;
6aa8b732 1405 break;
7de75248 1406 case 0xa0 ... 0xa1: /* mov */
e4e03ded
LV		 1407 c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
1408 c->dst.val = c->src.val;
7de75248
NK		 1409 break;
1410 case 0xa2 ... 0xa3: /* mov */
e4e03ded 1411 c->dst.val = (unsigned long)c->regs[VCPU_REGS_RAX];
7de75248 1412 break;
6aa8b732 1413 case 0xc0 ... 0xc1:
05f086f8 1414 emulate_grp2(ctxt);
6aa8b732 1415 break;
7de75248
NK		 1416 case 0xc6 ... 0xc7: /* mov (sole member of Grp11) */
1417 mov:
e4e03ded 1418 c->dst.val = c->src.val;
7de75248 1419 break;
6aa8b732 1420 case 0xd0 ... 0xd1: /* Grp2 */
e4e03ded 1421 c->src.val = 1;
05f086f8 1422 emulate_grp2(ctxt);
8cdbd2c9 1423 break;
6aa8b732 1424 case 0xd2 ... 0xd3: /* Grp2 */
e4e03ded 1425 c->src.val = c->regs[VCPU_REGS_RCX];
05f086f8 1426 emulate_grp2(ctxt);
8cdbd2c9 1427 break;
6aa8b732 1428 case 0xf6 ... 0xf7: /* Grp3 */
05f086f8 1429 rc = emulate_grp3(ctxt, ops);
8cdbd2c9
LV		 1430 if (rc != 0)
1431 goto done;
6aa8b732
AK		 1432 break;
1433 case 0xfe ... 0xff: /* Grp4/Grp5 */
a01af5ec 1434 rc = emulate_grp45(ctxt, ops);
8cdbd2c9
LV		 1435 if (rc != 0)
1436 goto done;
6aa8b732
AK		 1437 break;
1438 }
1439
1440writeback:
a01af5ec
LV		 1441 rc = writeback(ctxt, ops);
1442 if (rc != 0)
1443 goto done;
6aa8b732
AK		 1444
1445 /* Commit shadow register state. */
e4e03ded 1446 memcpy(ctxt->vcpu->regs, c->regs, sizeof c->regs);
e4e03ded 1447 ctxt->vcpu->rip = c->eip;
6aa8b732
AK		 1448
1449done:
3427318f
LV		 1450 if (rc == X86EMUL_UNHANDLEABLE) {
1451 c->eip = saved_eip;
1452 return -1;
1453 }
1454 return 0;
6aa8b732
AK		 1455
1456special_insn:
e4e03ded 1457 if (c->twobyte)
6aa8b732 1458 goto twobyte_special_insn;
e4e03ded 1459 switch (c->b) {
1e35d3c4 1460 case 0x6a: /* push imm8 */
e4e03ded
LV		 1461 c->src.val = 0L;
1462 c->src.val = insn_fetch(s8, 1, c->eip);
8cdbd2c9 1463 emulate_push(ctxt);
1e35d3c4 1464 break;
e70669ab
LV		 1465 case 0x6c: /* insb */
1466 case 0x6d: /* insw/insd */
3090dd73 1467 if (kvm_emulate_pio_string(ctxt->vcpu, NULL,
e4e03ded
LV		 1468 1,
1469 (c->d & ByteOp) ? 1 : c->op_bytes,
1470 c->rep_prefix ?
1471 address_mask(c->regs[VCPU_REGS_RCX]) : 1,
05f086f8 1472 (ctxt->eflags & EFLG_DF),
e70669ab 1473 register_address(ctxt->es_base,
e4e03ded
LV		 1474 c->regs[VCPU_REGS_RDI]),
1475 c->rep_prefix,
3427318f
LV		 1476 c->regs[VCPU_REGS_RDX]) == 0) {
1477 c->eip = saved_eip;
e70669ab 1478 return -1;
3427318f 1479 }
e70669ab
LV		 1480 return 0;
1481 case 0x6e: /* outsb */
1482 case 0x6f: /* outsw/outsd */
3090dd73 1483 if (kvm_emulate_pio_string(ctxt->vcpu, NULL,
e4e03ded
LV		 1484 0,
1485 (c->d & ByteOp) ? 1 : c->op_bytes,
1486 c->rep_prefix ?
1487 address_mask(c->regs[VCPU_REGS_RCX]) : 1,
05f086f8 1488 (ctxt->eflags & EFLG_DF),
e4e03ded
LV		 1489 register_address(c->override_base ?
1490 *c->override_base :
1491 ctxt->ds_base,
1492 c->regs[VCPU_REGS_RSI]),
1493 c->rep_prefix,
3427318f
LV		 1494 c->regs[VCPU_REGS_RDX]) == 0) {
1495 c->eip = saved_eip;
e70669ab 1496 return -1;
3427318f 1497 }
e70669ab 1498 return 0;
55bebde4 1499 case 0x70 ... 0x7f: /* jcc (short) */ {
e4e03ded 1500 int rel = insn_fetch(s8, 1, c->eip);
55bebde4 1501
05f086f8 1502 if (test_cc(c->b, ctxt->eflags))
55bebde4
NK		 1503 JMP_REL(rel);
1504 break;
1505 }
fd2a7608 1506 case 0x9c: /* pushf */
05f086f8 1507 c->src.val = (unsigned long) ctxt->eflags;
8cdbd2c9
LV		 1508 emulate_push(ctxt);
1509 break;
535eabcf 1510 case 0x9d: /* popf */
05f086f8 1511 c->dst.ptr = (unsigned long *) &ctxt->eflags;
535eabcf 1512 goto pop_instruction;
7de75248 1513 case 0xc3: /* ret */
e4e03ded 1514 c->dst.ptr = &c->eip;
7de75248
NK		 1515 goto pop_instruction;
1516 case 0xf4: /* hlt */
1517 ctxt->vcpu->halt_request = 1;
1518 goto done;
b284be57
NK		 1519 case 0xf5: /* cmc */
1520 /* complement carry flag from eflags reg */
1521 ctxt->eflags ^= EFLG_CF;
1522 c->dst.type = OP_NONE; /* Disable writeback. */
1523 break;
1524 case 0xf8: /* clc */
1525 ctxt->eflags &= ~EFLG_CF;
1526 c->dst.type = OP_NONE; /* Disable writeback. */
1527 break;
1528 case 0xfa: /* cli */
1529 ctxt->eflags &= ~X86_EFLAGS_IF;
1530 c->dst.type = OP_NONE; /* Disable writeback. */
1531 break;
1532 case 0xfb: /* sti */
1533 ctxt->eflags |= X86_EFLAGS_IF;
1534 c->dst.type = OP_NONE; /* Disable writeback. */
1535 break;
e70669ab 1536 }
e4e03ded
LV		 1537 if (c->rep_prefix) {
1538 if (c->regs[VCPU_REGS_RCX] == 0) {
1539 ctxt->vcpu->rip = c->eip;
6aa8b732
AK		 1540 goto done;
1541 }
e4e03ded
LV		 1542 c->regs[VCPU_REGS_RCX]--;
1543 c->eip = ctxt->vcpu->rip;
6aa8b732 1544 }
e4e03ded 1545 switch (c->b) {
6aa8b732 1546 case 0xa4 ... 0xa5: /* movs */
e4e03ded
LV		 1547 c->dst.type = OP_MEM;
1548 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
1549 c->dst.ptr = (unsigned long *)register_address(
1550 ctxt->es_base,
1551 c->regs[VCPU_REGS_RDI]);
6aa8b732 1552 if ((rc = ops->read_emulated(register_address(
e4e03ded
LV		 1553 c->override_base ? *c->override_base :
1554 ctxt->ds_base,
1555 c->regs[VCPU_REGS_RSI]),
1556 &c->dst.val,
1557 c->dst.bytes, ctxt->vcpu)) != 0)
6aa8b732 1558 goto done;
e4e03ded 1559 register_address_increment(c->regs[VCPU_REGS_RSI],
05f086f8 1560 (ctxt->eflags & EFLG_DF) ? -c->dst.bytes
e4e03ded
LV		 1561 : c->dst.bytes);
1562 register_address_increment(c->regs[VCPU_REGS_RDI],
05f086f8 1563 (ctxt->eflags & EFLG_DF) ? -c->dst.bytes
e4e03ded 1564 : c->dst.bytes);
6aa8b732
AK		 1565 break;
1566 case 0xa6 ... 0xa7: /* cmps */
1567 DPRINTF("Urk! I don't handle CMPS.\n");
1568 goto cannot_emulate;
1569 case 0xaa ... 0xab: /* stos */
e4e03ded
LV		 1570 c->dst.type = OP_MEM;
1571 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
a7e6c88a
SY		 1572 c->dst.ptr = (unsigned long *)register_address(
1573 ctxt->es_base,
1574 c->regs[VCPU_REGS_RDI]);
e4e03ded
LV		 1575 c->dst.val = c->regs[VCPU_REGS_RAX];
1576 register_address_increment(c->regs[VCPU_REGS_RDI],
05f086f8 1577 (ctxt->eflags & EFLG_DF) ? -c->dst.bytes
e4e03ded 1578 : c->dst.bytes);
6aa8b732
AK		 1579 break;
1580 case 0xac ... 0xad: /* lods */
e4e03ded
LV		 1581 c->dst.type = OP_REG;
1582 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
1583 c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
a7e6c88a
SY		 1584 if ((rc = ops->read_emulated(register_address(
1585 c->override_base ? *c->override_base :
1586 ctxt->ds_base,
1587 c->regs[VCPU_REGS_RSI]),
1588 &c->dst.val,
1589 c->dst.bytes,
1590 ctxt->vcpu)) != 0)
6aa8b732 1591 goto done;
e4e03ded 1592 register_address_increment(c->regs[VCPU_REGS_RSI],
05f086f8 1593 (ctxt->eflags & EFLG_DF) ? -c->dst.bytes
e4e03ded 1594 : c->dst.bytes);
6aa8b732
AK		 1595 break;
1596 case 0xae ... 0xaf: /* scas */
1597 DPRINTF("Urk! I don't handle SCAS.\n");
1598 goto cannot_emulate;
1a52e051
NK		 1599 case 0xe8: /* call (near) */ {
1600 long int rel;
e4e03ded 1601 switch (c->op_bytes) {
1a52e051 1602 case 2:
e4e03ded 1603 rel = insn_fetch(s16, 2, c->eip);
1a52e051
NK		 1604 break;
1605 case 4:
e4e03ded 1606 rel = insn_fetch(s32, 4, c->eip);
1a52e051 1607 break;
1a52e051
NK		 1608 default:
1609 DPRINTF("Call: Invalid op_bytes\n");
1610 goto cannot_emulate;
1611 }
e4e03ded 1612 c->src.val = (unsigned long) c->eip;
1a52e051 1613 JMP_REL(rel);
e4e03ded 1614 c->op_bytes = c->ad_bytes;
8cdbd2c9
LV		 1615 emulate_push(ctxt);
1616 break;
1a52e051
NK		 1617 }
1618 case 0xe9: /* jmp rel */
1619 case 0xeb: /* jmp rel short */
e4e03ded 1620 JMP_REL(c->src.val);
a01af5ec 1621 c->dst.type = OP_NONE; /* Disable writeback. */
1a52e051
NK		 1622 break;
1623
7f0aaee0 1624
6aa8b732
AK		 1625 }
1626 goto writeback;
1627
1628twobyte_insn:
e4e03ded 1629 switch (c->b) {
6aa8b732 1630 case 0x01: /* lgdt, lidt, lmsw */
e4e03ded 1631 switch (c->modrm_reg) {
6aa8b732
AK		 1632 u16 size;
1633 unsigned long address;
1634
aca7f966 1635 case 0: /* vmcall */
e4e03ded 1636 if (c->modrm_mod != 3 || c->modrm_rm != 1)
aca7f966
AL		 1637 goto cannot_emulate;
1638
7aa81cc0
AL		 1639 rc = kvm_fix_hypercall(ctxt->vcpu);
1640 if (rc)
1641 goto done;
1642
1643 kvm_emulate_hypercall(ctxt->vcpu);
aca7f966 1644 break;
6aa8b732 1645 case 2: /* lgdt */
e4e03ded
LV		 1646 rc = read_descriptor(ctxt, ops, c->src.ptr,
1647 &size, &address, c->op_bytes);
6aa8b732
AK		 1648 if (rc)
1649 goto done;
1650 realmode_lgdt(ctxt->vcpu, size, address);
1651 break;
aca7f966 1652 case 3: /* lidt/vmmcall */
e4e03ded 1653 if (c->modrm_mod == 3 && c->modrm_rm == 1) {
7aa81cc0
AL		 1654 rc = kvm_fix_hypercall(ctxt->vcpu);
1655 if (rc)
1656 goto done;
1657 kvm_emulate_hypercall(ctxt->vcpu);
aca7f966 1658 } else {
e4e03ded 1659 rc = read_descriptor(ctxt, ops, c->src.ptr,
aca7f966 1660 &size, &address,
e4e03ded 1661 c->op_bytes);
aca7f966
AL		 1662 if (rc)
1663 goto done;
1664 realmode_lidt(ctxt->vcpu, size, address);
1665 }
6aa8b732
AK		 1666 break;
1667 case 4: /* smsw */
e4e03ded 1668 if (c->modrm_mod != 3)
6aa8b732 1669 goto cannot_emulate;
e4e03ded 1670 *(u16 *)&c->regs[c->modrm_rm]
6aa8b732
AK		 1671 = realmode_get_cr(ctxt->vcpu, 0);
1672 break;
1673 case 6: /* lmsw */
e4e03ded 1674 if (c->modrm_mod != 3)
6aa8b732 1675 goto cannot_emulate;
05f086f8
LV		 1676 realmode_lmsw(ctxt->vcpu, (u16)c->modrm_val,
1677 &ctxt->eflags);
6aa8b732
AK		 1678 break;
1679 case 7: /* invlpg*/
e8d8d7fe 1680 emulate_invlpg(ctxt->vcpu, memop);
6aa8b732
AK		 1681 break;
1682 default:
1683 goto cannot_emulate;
1684 }
a01af5ec
LV		 1685 /* Disable writeback. */
1686 c->dst.type = OP_NONE;
6aa8b732
AK		 1687 break;
1688 case 0x21: /* mov from dr to reg */
e4e03ded 1689 if (c->modrm_mod != 3)
6aa8b732 1690 goto cannot_emulate;
8cdbd2c9 1691 rc = emulator_get_dr(ctxt, c->modrm_reg, &c->regs[c->modrm_rm]);
a01af5ec
LV		 1692 if (rc)
1693 goto cannot_emulate;
1694 c->dst.type = OP_NONE; /* no writeback */
6aa8b732
AK		 1695 break;
1696 case 0x23: /* mov from reg to dr */
e4e03ded 1697 if (c->modrm_mod != 3)
6aa8b732 1698 goto cannot_emulate;
e4e03ded
LV		 1699 rc = emulator_set_dr(ctxt, c->modrm_reg,
1700 c->regs[c->modrm_rm]);
a01af5ec
LV		 1701 if (rc)
1702 goto cannot_emulate;
1703 c->dst.type = OP_NONE; /* no writeback */
6aa8b732
AK		 1704 break;
1705 case 0x40 ... 0x4f: /* cmov */
e4e03ded 1706 c->dst.val = c->dst.orig_val = c->src.val;
a01af5ec
LV		 1707 if (!test_cc(c->b, ctxt->eflags))
1708 c->dst.type = OP_NONE; /* no writeback */
6aa8b732 1709 break;
7de75248
NK		 1710 case 0xa3:
1711 bt: /* bt */
e4f8e039 1712 c->dst.type = OP_NONE;
e4e03ded
LV		 1713 /* only subword offset */
1714 c->src.val &= (c->dst.bytes << 3) - 1;
05f086f8 1715 emulate_2op_SrcV_nobyte("bt", c->src, c->dst, ctxt->eflags);
7de75248
NK		 1716 break;
1717 case 0xab:
1718 bts: /* bts */
e4e03ded
LV		 1719 /* only subword offset */
1720 c->src.val &= (c->dst.bytes << 3) - 1;
05f086f8 1721 emulate_2op_SrcV_nobyte("bts", c->src, c->dst, ctxt->eflags);
7de75248 1722 break;
6aa8b732
AK		 1723 case 0xb0 ... 0xb1: /* cmpxchg */
1724 /*
1725 * Save real source value, then compare EAX against
1726 * destination.
1727 */
e4e03ded
LV		 1728 c->src.orig_val = c->src.val;
1729 c->src.val = c->regs[VCPU_REGS_RAX];
05f086f8
LV		 1730 emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
1731 if (ctxt->eflags & EFLG_ZF) {
6aa8b732 1732 /* Success: write back to memory. */
e4e03ded 1733 c->dst.val = c->src.orig_val;
6aa8b732
AK		 1734 } else {
1735 /* Failure: write the value we saw to EAX. */
e4e03ded
LV		 1736 c->dst.type = OP_REG;
1737 c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
6aa8b732
AK		 1738 }
1739 break;
6aa8b732
AK		 1740 case 0xb3:
1741 btr: /* btr */
e4e03ded
LV		 1742 /* only subword offset */
1743 c->src.val &= (c->dst.bytes << 3) - 1;
05f086f8 1744 emulate_2op_SrcV_nobyte("btr", c->src, c->dst, ctxt->eflags);
6aa8b732 1745 break;
6aa8b732 1746 case 0xb6 ... 0xb7: /* movzx */
e4e03ded
LV		 1747 c->dst.bytes = c->op_bytes;
1748 c->dst.val = (c->d & ByteOp) ? (u8) c->src.val
1749 : (u16) c->src.val;
6aa8b732 1750 break;
6aa8b732 1751 case 0xba: /* Grp8 */
e4e03ded 1752 switch (c->modrm_reg & 3) {
6aa8b732
AK		 1753 case 0:
1754 goto bt;
1755 case 1:
1756 goto bts;
1757 case 2:
1758 goto btr;
1759 case 3:
1760 goto btc;
1761 }
1762 break;
7de75248
NK		 1763 case 0xbb:
1764 btc: /* btc */
e4e03ded
LV		 1765 /* only subword offset */
1766 c->src.val &= (c->dst.bytes << 3) - 1;
05f086f8 1767 emulate_2op_SrcV_nobyte("btc", c->src, c->dst, ctxt->eflags);
7de75248 1768 break;
6aa8b732 1769 case 0xbe ... 0xbf: /* movsx */
e4e03ded
LV		 1770 c->dst.bytes = c->op_bytes;
1771 c->dst.val = (c->d & ByteOp) ? (s8) c->src.val :
1772 (s16) c->src.val;
6aa8b732 1773 break;
a012e65a 1774 case 0xc3: /* movnti */
e4e03ded
LV		 1775 c->dst.bytes = c->op_bytes;
1776 c->dst.val = (c->op_bytes == 4) ? (u32) c->src.val :
1777 (u64) c->src.val;
a012e65a 1778 break;
6aa8b732
AK		 1779 }
1780 goto writeback;
1781
1782twobyte_special_insn:
e4e03ded 1783 switch (c->b) {
7de75248
NK		 1784 case 0x06:
1785 emulate_clts(ctxt->vcpu);
1786 break;
651a3e29
AK		 1787 case 0x08: /* invd */
1788 break;
687fdbfe
AK		 1789 case 0x09: /* wbinvd */
1790 break;
6aa8b732
AK		 1791 case 0x0d: /* GrpP (prefetch) */
1792 case 0x18: /* Grp16 (prefetch/nop) */
1793 break;
6aa8b732 1794 case 0x20: /* mov cr, reg */
e4e03ded 1795 if (c->modrm_mod != 3)
6aa8b732 1796 goto cannot_emulate;
e4e03ded
LV		 1797 c->regs[c->modrm_rm] =
1798 realmode_get_cr(ctxt->vcpu, c->modrm_reg);
6aa8b732
AK		 1799 break;
1800 case 0x22: /* mov reg, cr */
e4e03ded 1801 if (c->modrm_mod != 3)
6aa8b732 1802 goto cannot_emulate;
e4e03ded 1803 realmode_set_cr(ctxt->vcpu,
05f086f8 1804 c->modrm_reg, c->modrm_val, &ctxt->eflags);
6aa8b732 1805 break;
35f3f286
AK		 1806 case 0x30:
1807 /* wrmsr */
e4e03ded
LV		 1808 msr_data = (u32)c->regs[VCPU_REGS_RAX]
1809 | ((u64)c->regs[VCPU_REGS_RDX] << 32);
1810 rc = kvm_set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data);
35f3f286 1811 if (rc) {
cbdd1bea 1812 kvm_x86_ops->inject_gp(ctxt->vcpu, 0);
e4e03ded 1813 c->eip = ctxt->vcpu->rip;
35f3f286
AK		 1814 }
1815 rc = X86EMUL_CONTINUE;
1816 break;
1817 case 0x32:
1818 /* rdmsr */
8cdbd2c9 1819 rc = kvm_get_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], &msr_data);
35f3f286 1820 if (rc) {
cbdd1bea 1821 kvm_x86_ops->inject_gp(ctxt->vcpu, 0);
e4e03ded 1822 c->eip = ctxt->vcpu->rip;
35f3f286 1823 } else {
e4e03ded
LV		 1824 c->regs[VCPU_REGS_RAX] = (u32)msr_data;
1825 c->regs[VCPU_REGS_RDX] = msr_data >> 32;
35f3f286
AK		 1826 }
1827 rc = X86EMUL_CONTINUE;
1828 break;
bbe9abbd
NK		 1829 case 0x80 ... 0x8f: /* jnz rel, etc*/ {
1830 long int rel;
1831
e4e03ded 1832 switch (c->op_bytes) {
bbe9abbd 1833 case 2:
e4e03ded 1834 rel = insn_fetch(s16, 2, c->eip);
bbe9abbd
NK		 1835 break;
1836 case 4:
e4e03ded 1837 rel = insn_fetch(s32, 4, c->eip);
bbe9abbd
NK		 1838 break;
1839 case 8:
e4e03ded 1840 rel = insn_fetch(s64, 8, c->eip);
bbe9abbd
NK		 1841 break;
1842 default:
1843 DPRINTF("jnz: Invalid op_bytes\n");
1844 goto cannot_emulate;
1845 }
05f086f8 1846 if (test_cc(c->b, ctxt->eflags))
bbe9abbd
NK		 1847 JMP_REL(rel);
1848 break;
1849 }
6aa8b732 1850 case 0xc7: /* Grp9 (cmpxchg8b) */
e8d8d7fe 1851 rc = emulate_grp9(ctxt, ops, memop);
8cdbd2c9
LV		 1852 if (rc != 0)
1853 goto done;
1854 break;
6aa8b732 1855 }
a01af5ec
LV		 1856 /* Disable writeback. */
1857 c->dst.type = OP_NONE;
6aa8b732
AK		 1858 goto writeback;
1859
1860cannot_emulate:
e4e03ded 1861 DPRINTF("Cannot emulate %02x\n", c->b);
3427318f 1862 c->eip = saved_eip;
6aa8b732
AK		 1863 return -1;
1864}
Linux kernel - Deliverables
This page took 0.253866 seconds and 5 git commands to generate.