]>
Commit | Line | Data |
---|---|---|
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 | |
9 | * privieged instructions: | |
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> | |
26 | #define DPRINTF(_f, _a ...) printf( _f , ## _a ) | |
27 | #else | |
28 | #include "kvm.h" | |
29 | #define DPRINTF(x...) do {} while (0) | |
30 | #endif | |
31 | #include "x86_emulate.h" | |
32 | #include <linux/module.h> | |
33 | ||
34 | /* | |
35 | * Opcode effective-address decode tables. | |
36 | * Note that we only emulate instructions that have at least one memory | |
37 | * operand (excluding implicit stack references). We assume that stack | |
38 | * references and instruction fetches will never occur in special memory | |
39 | * areas that require emulation. So, for example, 'mov <imm>,<reg>' need | |
40 | * not be handled. | |
41 | */ | |
42 | ||
43 | /* Operand sizes: 8-bit operands or specified/overridden size. */ | |
44 | #define ByteOp (1<<0) /* 8-bit operands. */ | |
45 | /* Destination operand type. */ | |
46 | #define ImplicitOps (1<<1) /* Implicit in opcode. No generic decode. */ | |
47 | #define DstReg (2<<1) /* Register operand. */ | |
48 | #define DstMem (3<<1) /* Memory operand. */ | |
49 | #define DstMask (3<<1) | |
50 | /* Source operand type. */ | |
51 | #define SrcNone (0<<3) /* No source operand. */ | |
52 | #define SrcImplicit (0<<3) /* Source operand is implicit in the opcode. */ | |
53 | #define SrcReg (1<<3) /* Register operand. */ | |
54 | #define SrcMem (2<<3) /* Memory operand. */ | |
55 | #define SrcMem16 (3<<3) /* Memory operand (16-bit). */ | |
56 | #define SrcMem32 (4<<3) /* Memory operand (32-bit). */ | |
57 | #define SrcImm (5<<3) /* Immediate operand. */ | |
58 | #define SrcImmByte (6<<3) /* 8-bit sign-extended immediate operand. */ | |
59 | #define SrcMask (7<<3) | |
60 | /* Generic ModRM decode. */ | |
61 | #define ModRM (1<<6) | |
62 | /* Destination is only written; never read. */ | |
63 | #define Mov (1<<7) | |
038e51de | 64 | #define BitOp (1<<8) |
6aa8b732 AK |
65 | |
66 | static u8 opcode_table[256] = { | |
67 | /* 0x00 - 0x07 */ | |
68 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
69 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
70 | 0, 0, 0, 0, | |
71 | /* 0x08 - 0x0F */ | |
72 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
73 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
74 | 0, 0, 0, 0, | |
75 | /* 0x10 - 0x17 */ | |
76 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
77 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
78 | 0, 0, 0, 0, | |
79 | /* 0x18 - 0x1F */ | |
80 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
81 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
82 | 0, 0, 0, 0, | |
83 | /* 0x20 - 0x27 */ | |
84 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
85 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
86 | 0, 0, 0, 0, | |
87 | /* 0x28 - 0x2F */ | |
88 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
89 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
90 | 0, 0, 0, 0, | |
91 | /* 0x30 - 0x37 */ | |
92 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
93 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
94 | 0, 0, 0, 0, | |
95 | /* 0x38 - 0x3F */ | |
96 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
97 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
98 | 0, 0, 0, 0, | |
99 | /* 0x40 - 0x4F */ | |
100 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
7f0aaee0 NK |
101 | /* 0x50 - 0x57 */ |
102 | 0, 0, 0, 0, 0, 0, 0, 0, | |
103 | /* 0x58 - 0x5F */ | |
104 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
105 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
6aa8b732 AK |
106 | /* 0x60 - 0x6F */ |
107 | 0, 0, 0, DstReg | SrcMem32 | ModRM | Mov /* movsxd (x86/64) */ , | |
108 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
109 | /* 0x70 - 0x7F */ | |
110 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
111 | /* 0x80 - 0x87 */ | |
112 | ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM, | |
113 | ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImmByte | ModRM, | |
114 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
115 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
116 | /* 0x88 - 0x8F */ | |
117 | ByteOp | DstMem | SrcReg | ModRM | Mov, DstMem | SrcReg | ModRM | Mov, | |
118 | ByteOp | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
119 | 0, 0, 0, DstMem | SrcNone | ModRM | Mov, | |
120 | /* 0x90 - 0x9F */ | |
121 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
122 | /* 0xA0 - 0xA7 */ | |
123 | ByteOp | DstReg | SrcMem | Mov, DstReg | SrcMem | Mov, | |
124 | ByteOp | DstMem | SrcReg | Mov, DstMem | SrcReg | Mov, | |
125 | ByteOp | ImplicitOps | Mov, ImplicitOps | Mov, | |
126 | ByteOp | ImplicitOps, ImplicitOps, | |
127 | /* 0xA8 - 0xAF */ | |
128 | 0, 0, ByteOp | ImplicitOps | Mov, ImplicitOps | Mov, | |
129 | ByteOp | ImplicitOps | Mov, ImplicitOps | Mov, | |
130 | ByteOp | ImplicitOps, ImplicitOps, | |
131 | /* 0xB0 - 0xBF */ | |
132 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
133 | /* 0xC0 - 0xC7 */ | |
d9413cd7 NK |
134 | ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImmByte | ModRM, |
135 | 0, ImplicitOps, 0, 0, | |
136 | ByteOp | DstMem | SrcImm | ModRM | Mov, DstMem | SrcImm | ModRM | Mov, | |
6aa8b732 AK |
137 | /* 0xC8 - 0xCF */ |
138 | 0, 0, 0, 0, 0, 0, 0, 0, | |
139 | /* 0xD0 - 0xD7 */ | |
140 | ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM, | |
141 | ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM, | |
142 | 0, 0, 0, 0, | |
143 | /* 0xD8 - 0xDF */ | |
144 | 0, 0, 0, 0, 0, 0, 0, 0, | |
145 | /* 0xE0 - 0xEF */ | |
146 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
147 | /* 0xF0 - 0xF7 */ | |
148 | 0, 0, 0, 0, | |
72d6e5a0 AK |
149 | ImplicitOps, 0, |
150 | ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM, | |
6aa8b732 AK |
151 | /* 0xF8 - 0xFF */ |
152 | 0, 0, 0, 0, | |
153 | 0, 0, ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM | |
154 | }; | |
155 | ||
038e51de | 156 | static u16 twobyte_table[256] = { |
6aa8b732 AK |
157 | /* 0x00 - 0x0F */ |
158 | 0, SrcMem | ModRM | DstReg, 0, 0, 0, 0, ImplicitOps, 0, | |
687fdbfe | 159 | 0, ImplicitOps, 0, 0, 0, ImplicitOps | ModRM, 0, 0, |
6aa8b732 AK |
160 | /* 0x10 - 0x1F */ |
161 | 0, 0, 0, 0, 0, 0, 0, 0, ImplicitOps | ModRM, 0, 0, 0, 0, 0, 0, 0, | |
162 | /* 0x20 - 0x2F */ | |
163 | ModRM | ImplicitOps, ModRM, ModRM | ImplicitOps, ModRM, 0, 0, 0, 0, | |
164 | 0, 0, 0, 0, 0, 0, 0, 0, | |
165 | /* 0x30 - 0x3F */ | |
35f3f286 | 166 | ImplicitOps, 0, ImplicitOps, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
6aa8b732 AK |
167 | /* 0x40 - 0x47 */ |
168 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
169 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
170 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
171 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
172 | /* 0x48 - 0x4F */ | |
173 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
174 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
175 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
176 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
177 | /* 0x50 - 0x5F */ | |
178 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
179 | /* 0x60 - 0x6F */ | |
180 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
181 | /* 0x70 - 0x7F */ | |
182 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
183 | /* 0x80 - 0x8F */ | |
184 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
185 | /* 0x90 - 0x9F */ | |
186 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
187 | /* 0xA0 - 0xA7 */ | |
038e51de | 188 | 0, 0, 0, DstMem | SrcReg | ModRM | BitOp, 0, 0, 0, 0, |
6aa8b732 | 189 | /* 0xA8 - 0xAF */ |
038e51de | 190 | 0, 0, 0, DstMem | SrcReg | ModRM | BitOp, 0, 0, 0, 0, |
6aa8b732 AK |
191 | /* 0xB0 - 0xB7 */ |
192 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, 0, | |
038e51de | 193 | DstMem | SrcReg | ModRM | BitOp, |
6aa8b732 AK |
194 | 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov, |
195 | DstReg | SrcMem16 | ModRM | Mov, | |
196 | /* 0xB8 - 0xBF */ | |
038e51de | 197 | 0, 0, DstMem | SrcImmByte | ModRM, DstMem | SrcReg | ModRM | BitOp, |
6aa8b732 AK |
198 | 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov, |
199 | DstReg | SrcMem16 | ModRM | Mov, | |
200 | /* 0xC0 - 0xCF */ | |
201 | 0, 0, 0, 0, 0, 0, 0, ImplicitOps | ModRM, 0, 0, 0, 0, 0, 0, 0, 0, | |
202 | /* 0xD0 - 0xDF */ | |
203 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
204 | /* 0xE0 - 0xEF */ | |
205 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
206 | /* 0xF0 - 0xFF */ | |
207 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
208 | }; | |
209 | ||
210 | /* | |
211 | * Tell the emulator that of the Group 7 instructions (sgdt, lidt, etc.) we | |
212 | * are interested only in invlpg and not in any of the rest. | |
213 | * | |
214 | * invlpg is a special instruction in that the data it references may not | |
215 | * be mapped. | |
216 | */ | |
217 | void kvm_emulator_want_group7_invlpg(void) | |
218 | { | |
219 | twobyte_table[1] &= ~SrcMem; | |
220 | } | |
221 | EXPORT_SYMBOL_GPL(kvm_emulator_want_group7_invlpg); | |
222 | ||
223 | /* Type, address-of, and value of an instruction's operand. */ | |
224 | struct operand { | |
225 | enum { OP_REG, OP_MEM, OP_IMM } type; | |
226 | unsigned int bytes; | |
227 | unsigned long val, orig_val, *ptr; | |
228 | }; | |
229 | ||
230 | /* EFLAGS bit definitions. */ | |
231 | #define EFLG_OF (1<<11) | |
232 | #define EFLG_DF (1<<10) | |
233 | #define EFLG_SF (1<<7) | |
234 | #define EFLG_ZF (1<<6) | |
235 | #define EFLG_AF (1<<4) | |
236 | #define EFLG_PF (1<<2) | |
237 | #define EFLG_CF (1<<0) | |
238 | ||
239 | /* | |
240 | * Instruction emulation: | |
241 | * Most instructions are emulated directly via a fragment of inline assembly | |
242 | * code. This allows us to save/restore EFLAGS and thus very easily pick up | |
243 | * any modified flags. | |
244 | */ | |
245 | ||
05b3e0c2 | 246 | #if defined(CONFIG_X86_64) |
6aa8b732 AK |
247 | #define _LO32 "k" /* force 32-bit operand */ |
248 | #define _STK "%%rsp" /* stack pointer */ | |
249 | #elif defined(__i386__) | |
250 | #define _LO32 "" /* force 32-bit operand */ | |
251 | #define _STK "%%esp" /* stack pointer */ | |
252 | #endif | |
253 | ||
254 | /* | |
255 | * These EFLAGS bits are restored from saved value during emulation, and | |
256 | * any changes are written back to the saved value after emulation. | |
257 | */ | |
258 | #define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF) | |
259 | ||
260 | /* Before executing instruction: restore necessary bits in EFLAGS. */ | |
261 | #define _PRE_EFLAGS(_sav, _msk, _tmp) \ | |
262 | /* EFLAGS = (_sav & _msk) | (EFLAGS & ~_msk); */ \ | |
263 | "push %"_sav"; " \ | |
264 | "movl %"_msk",%"_LO32 _tmp"; " \ | |
265 | "andl %"_LO32 _tmp",("_STK"); " \ | |
266 | "pushf; " \ | |
267 | "notl %"_LO32 _tmp"; " \ | |
268 | "andl %"_LO32 _tmp",("_STK"); " \ | |
269 | "pop %"_tmp"; " \ | |
270 | "orl %"_LO32 _tmp",("_STK"); " \ | |
271 | "popf; " \ | |
272 | /* _sav &= ~msk; */ \ | |
273 | "movl %"_msk",%"_LO32 _tmp"; " \ | |
274 | "notl %"_LO32 _tmp"; " \ | |
275 | "andl %"_LO32 _tmp",%"_sav"; " | |
276 | ||
277 | /* After executing instruction: write-back necessary bits in EFLAGS. */ | |
278 | #define _POST_EFLAGS(_sav, _msk, _tmp) \ | |
279 | /* _sav |= EFLAGS & _msk; */ \ | |
280 | "pushf; " \ | |
281 | "pop %"_tmp"; " \ | |
282 | "andl %"_msk",%"_LO32 _tmp"; " \ | |
283 | "orl %"_LO32 _tmp",%"_sav"; " | |
284 | ||
285 | /* Raw emulation: instruction has two explicit operands. */ | |
286 | #define __emulate_2op_nobyte(_op,_src,_dst,_eflags,_wx,_wy,_lx,_ly,_qx,_qy) \ | |
287 | do { \ | |
288 | unsigned long _tmp; \ | |
289 | \ | |
290 | switch ((_dst).bytes) { \ | |
291 | case 2: \ | |
292 | __asm__ __volatile__ ( \ | |
293 | _PRE_EFLAGS("0","4","2") \ | |
294 | _op"w %"_wx"3,%1; " \ | |
295 | _POST_EFLAGS("0","4","2") \ | |
296 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
297 | "=&r" (_tmp) \ | |
298 | : _wy ((_src).val), "i" (EFLAGS_MASK) ); \ | |
299 | break; \ | |
300 | case 4: \ | |
301 | __asm__ __volatile__ ( \ | |
302 | _PRE_EFLAGS("0","4","2") \ | |
303 | _op"l %"_lx"3,%1; " \ | |
304 | _POST_EFLAGS("0","4","2") \ | |
305 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
306 | "=&r" (_tmp) \ | |
307 | : _ly ((_src).val), "i" (EFLAGS_MASK) ); \ | |
308 | break; \ | |
309 | case 8: \ | |
310 | __emulate_2op_8byte(_op, _src, _dst, \ | |
311 | _eflags, _qx, _qy); \ | |
312 | break; \ | |
313 | } \ | |
314 | } while (0) | |
315 | ||
316 | #define __emulate_2op(_op,_src,_dst,_eflags,_bx,_by,_wx,_wy,_lx,_ly,_qx,_qy) \ | |
317 | do { \ | |
318 | unsigned long _tmp; \ | |
319 | switch ( (_dst).bytes ) \ | |
320 | { \ | |
321 | case 1: \ | |
322 | __asm__ __volatile__ ( \ | |
323 | _PRE_EFLAGS("0","4","2") \ | |
324 | _op"b %"_bx"3,%1; " \ | |
325 | _POST_EFLAGS("0","4","2") \ | |
326 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
327 | "=&r" (_tmp) \ | |
328 | : _by ((_src).val), "i" (EFLAGS_MASK) ); \ | |
329 | break; \ | |
330 | default: \ | |
331 | __emulate_2op_nobyte(_op, _src, _dst, _eflags, \ | |
332 | _wx, _wy, _lx, _ly, _qx, _qy); \ | |
333 | break; \ | |
334 | } \ | |
335 | } while (0) | |
336 | ||
337 | /* Source operand is byte-sized and may be restricted to just %cl. */ | |
338 | #define emulate_2op_SrcB(_op, _src, _dst, _eflags) \ | |
339 | __emulate_2op(_op, _src, _dst, _eflags, \ | |
340 | "b", "c", "b", "c", "b", "c", "b", "c") | |
341 | ||
342 | /* Source operand is byte, word, long or quad sized. */ | |
343 | #define emulate_2op_SrcV(_op, _src, _dst, _eflags) \ | |
344 | __emulate_2op(_op, _src, _dst, _eflags, \ | |
345 | "b", "q", "w", "r", _LO32, "r", "", "r") | |
346 | ||
347 | /* Source operand is word, long or quad sized. */ | |
348 | #define emulate_2op_SrcV_nobyte(_op, _src, _dst, _eflags) \ | |
349 | __emulate_2op_nobyte(_op, _src, _dst, _eflags, \ | |
350 | "w", "r", _LO32, "r", "", "r") | |
351 | ||
352 | /* Instruction has only one explicit operand (no source operand). */ | |
353 | #define emulate_1op(_op, _dst, _eflags) \ | |
354 | do { \ | |
355 | unsigned long _tmp; \ | |
356 | \ | |
357 | switch ( (_dst).bytes ) \ | |
358 | { \ | |
359 | case 1: \ | |
360 | __asm__ __volatile__ ( \ | |
361 | _PRE_EFLAGS("0","3","2") \ | |
362 | _op"b %1; " \ | |
363 | _POST_EFLAGS("0","3","2") \ | |
364 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
365 | "=&r" (_tmp) \ | |
366 | : "i" (EFLAGS_MASK) ); \ | |
367 | break; \ | |
368 | case 2: \ | |
369 | __asm__ __volatile__ ( \ | |
370 | _PRE_EFLAGS("0","3","2") \ | |
371 | _op"w %1; " \ | |
372 | _POST_EFLAGS("0","3","2") \ | |
373 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
374 | "=&r" (_tmp) \ | |
375 | : "i" (EFLAGS_MASK) ); \ | |
376 | break; \ | |
377 | case 4: \ | |
378 | __asm__ __volatile__ ( \ | |
379 | _PRE_EFLAGS("0","3","2") \ | |
380 | _op"l %1; " \ | |
381 | _POST_EFLAGS("0","3","2") \ | |
382 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
383 | "=&r" (_tmp) \ | |
384 | : "i" (EFLAGS_MASK) ); \ | |
385 | break; \ | |
386 | case 8: \ | |
387 | __emulate_1op_8byte(_op, _dst, _eflags); \ | |
388 | break; \ | |
389 | } \ | |
390 | } while (0) | |
391 | ||
392 | /* Emulate an instruction with quadword operands (x86/64 only). */ | |
05b3e0c2 | 393 | #if defined(CONFIG_X86_64) |
6aa8b732 AK |
394 | #define __emulate_2op_8byte(_op, _src, _dst, _eflags, _qx, _qy) \ |
395 | do { \ | |
396 | __asm__ __volatile__ ( \ | |
397 | _PRE_EFLAGS("0","4","2") \ | |
398 | _op"q %"_qx"3,%1; " \ | |
399 | _POST_EFLAGS("0","4","2") \ | |
400 | : "=m" (_eflags), "=m" ((_dst).val), "=&r" (_tmp) \ | |
401 | : _qy ((_src).val), "i" (EFLAGS_MASK) ); \ | |
402 | } while (0) | |
403 | ||
404 | #define __emulate_1op_8byte(_op, _dst, _eflags) \ | |
405 | do { \ | |
406 | __asm__ __volatile__ ( \ | |
407 | _PRE_EFLAGS("0","3","2") \ | |
408 | _op"q %1; " \ | |
409 | _POST_EFLAGS("0","3","2") \ | |
410 | : "=m" (_eflags), "=m" ((_dst).val), "=&r" (_tmp) \ | |
411 | : "i" (EFLAGS_MASK) ); \ | |
412 | } while (0) | |
413 | ||
414 | #elif defined(__i386__) | |
415 | #define __emulate_2op_8byte(_op, _src, _dst, _eflags, _qx, _qy) | |
416 | #define __emulate_1op_8byte(_op, _dst, _eflags) | |
417 | #endif /* __i386__ */ | |
418 | ||
419 | /* Fetch next part of the instruction being emulated. */ | |
420 | #define insn_fetch(_type, _size, _eip) \ | |
421 | ({ unsigned long _x; \ | |
422 | rc = ops->read_std((unsigned long)(_eip) + ctxt->cs_base, &_x, \ | |
423 | (_size), ctxt); \ | |
424 | if ( rc != 0 ) \ | |
425 | goto done; \ | |
426 | (_eip) += (_size); \ | |
427 | (_type)_x; \ | |
428 | }) | |
429 | ||
430 | /* Access/update address held in a register, based on addressing mode. */ | |
431 | #define register_address(base, reg) \ | |
432 | ((base) + ((ad_bytes == sizeof(unsigned long)) ? (reg) : \ | |
433 | ((reg) & ((1UL << (ad_bytes << 3)) - 1)))) | |
434 | ||
435 | #define register_address_increment(reg, inc) \ | |
436 | do { \ | |
437 | /* signed type ensures sign extension to long */ \ | |
438 | int _inc = (inc); \ | |
439 | if ( ad_bytes == sizeof(unsigned long) ) \ | |
440 | (reg) += _inc; \ | |
441 | else \ | |
442 | (reg) = ((reg) & ~((1UL << (ad_bytes << 3)) - 1)) | \ | |
443 | (((reg) + _inc) & ((1UL << (ad_bytes << 3)) - 1)); \ | |
444 | } while (0) | |
445 | ||
1e3c5cb0 RR |
446 | /* |
447 | * Given the 'reg' portion of a ModRM byte, and a register block, return a | |
448 | * pointer into the block that addresses the relevant register. | |
449 | * @highbyte_regs specifies whether to decode AH,CH,DH,BH. | |
450 | */ | |
451 | static void *decode_register(u8 modrm_reg, unsigned long *regs, | |
452 | int highbyte_regs) | |
6aa8b732 AK |
453 | { |
454 | void *p; | |
455 | ||
456 | p = ®s[modrm_reg]; | |
457 | if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8) | |
458 | p = (unsigned char *)®s[modrm_reg & 3] + 1; | |
459 | return p; | |
460 | } | |
461 | ||
462 | static int read_descriptor(struct x86_emulate_ctxt *ctxt, | |
463 | struct x86_emulate_ops *ops, | |
464 | void *ptr, | |
465 | u16 *size, unsigned long *address, int op_bytes) | |
466 | { | |
467 | int rc; | |
468 | ||
469 | if (op_bytes == 2) | |
470 | op_bytes = 3; | |
471 | *address = 0; | |
472 | rc = ops->read_std((unsigned long)ptr, (unsigned long *)size, 2, ctxt); | |
473 | if (rc) | |
474 | return rc; | |
475 | rc = ops->read_std((unsigned long)ptr + 2, address, op_bytes, ctxt); | |
476 | return rc; | |
477 | } | |
478 | ||
479 | int | |
480 | x86_emulate_memop(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) | |
481 | { | |
038e51de AK |
482 | unsigned d; |
483 | u8 b, sib, twobyte = 0, rex_prefix = 0; | |
6aa8b732 AK |
484 | u8 modrm, modrm_mod = 0, modrm_reg = 0, modrm_rm = 0; |
485 | unsigned long *override_base = NULL; | |
486 | unsigned int op_bytes, ad_bytes, lock_prefix = 0, rep_prefix = 0, i; | |
487 | int rc = 0; | |
488 | struct operand src, dst; | |
489 | unsigned long cr2 = ctxt->cr2; | |
490 | int mode = ctxt->mode; | |
491 | unsigned long modrm_ea; | |
492 | int use_modrm_ea, index_reg = 0, base_reg = 0, scale, rip_relative = 0; | |
02c03a32 | 493 | int no_wb = 0; |
35f3f286 | 494 | u64 msr_data; |
6aa8b732 AK |
495 | |
496 | /* Shadow copy of register state. Committed on successful emulation. */ | |
497 | unsigned long _regs[NR_VCPU_REGS]; | |
498 | unsigned long _eip = ctxt->vcpu->rip, _eflags = ctxt->eflags; | |
499 | unsigned long modrm_val = 0; | |
500 | ||
501 | memcpy(_regs, ctxt->vcpu->regs, sizeof _regs); | |
502 | ||
503 | switch (mode) { | |
504 | case X86EMUL_MODE_REAL: | |
505 | case X86EMUL_MODE_PROT16: | |
506 | op_bytes = ad_bytes = 2; | |
507 | break; | |
508 | case X86EMUL_MODE_PROT32: | |
509 | op_bytes = ad_bytes = 4; | |
510 | break; | |
05b3e0c2 | 511 | #ifdef CONFIG_X86_64 |
6aa8b732 AK |
512 | case X86EMUL_MODE_PROT64: |
513 | op_bytes = 4; | |
514 | ad_bytes = 8; | |
515 | break; | |
516 | #endif | |
517 | default: | |
518 | return -1; | |
519 | } | |
520 | ||
521 | /* Legacy prefixes. */ | |
522 | for (i = 0; i < 8; i++) { | |
523 | switch (b = insn_fetch(u8, 1, _eip)) { | |
524 | case 0x66: /* operand-size override */ | |
525 | op_bytes ^= 6; /* switch between 2/4 bytes */ | |
526 | break; | |
527 | case 0x67: /* address-size override */ | |
528 | if (mode == X86EMUL_MODE_PROT64) | |
529 | ad_bytes ^= 12; /* switch between 4/8 bytes */ | |
530 | else | |
531 | ad_bytes ^= 6; /* switch between 2/4 bytes */ | |
532 | break; | |
533 | case 0x2e: /* CS override */ | |
534 | override_base = &ctxt->cs_base; | |
535 | break; | |
536 | case 0x3e: /* DS override */ | |
537 | override_base = &ctxt->ds_base; | |
538 | break; | |
539 | case 0x26: /* ES override */ | |
540 | override_base = &ctxt->es_base; | |
541 | break; | |
542 | case 0x64: /* FS override */ | |
543 | override_base = &ctxt->fs_base; | |
544 | break; | |
545 | case 0x65: /* GS override */ | |
546 | override_base = &ctxt->gs_base; | |
547 | break; | |
548 | case 0x36: /* SS override */ | |
549 | override_base = &ctxt->ss_base; | |
550 | break; | |
551 | case 0xf0: /* LOCK */ | |
552 | lock_prefix = 1; | |
553 | break; | |
554 | case 0xf3: /* REP/REPE/REPZ */ | |
555 | rep_prefix = 1; | |
556 | break; | |
557 | case 0xf2: /* REPNE/REPNZ */ | |
558 | break; | |
559 | default: | |
560 | goto done_prefixes; | |
561 | } | |
562 | } | |
563 | ||
564 | done_prefixes: | |
565 | ||
566 | /* REX prefix. */ | |
567 | if ((mode == X86EMUL_MODE_PROT64) && ((b & 0xf0) == 0x40)) { | |
568 | rex_prefix = b; | |
569 | if (b & 8) | |
570 | op_bytes = 8; /* REX.W */ | |
571 | modrm_reg = (b & 4) << 1; /* REX.R */ | |
572 | index_reg = (b & 2) << 2; /* REX.X */ | |
573 | modrm_rm = base_reg = (b & 1) << 3; /* REG.B */ | |
574 | b = insn_fetch(u8, 1, _eip); | |
575 | } | |
576 | ||
577 | /* Opcode byte(s). */ | |
578 | d = opcode_table[b]; | |
579 | if (d == 0) { | |
580 | /* Two-byte opcode? */ | |
581 | if (b == 0x0f) { | |
582 | twobyte = 1; | |
583 | b = insn_fetch(u8, 1, _eip); | |
584 | d = twobyte_table[b]; | |
585 | } | |
586 | ||
587 | /* Unrecognised? */ | |
588 | if (d == 0) | |
589 | goto cannot_emulate; | |
590 | } | |
591 | ||
592 | /* ModRM and SIB bytes. */ | |
593 | if (d & ModRM) { | |
594 | modrm = insn_fetch(u8, 1, _eip); | |
595 | modrm_mod |= (modrm & 0xc0) >> 6; | |
596 | modrm_reg |= (modrm & 0x38) >> 3; | |
597 | modrm_rm |= (modrm & 0x07); | |
598 | modrm_ea = 0; | |
599 | use_modrm_ea = 1; | |
600 | ||
601 | if (modrm_mod == 3) { | |
602 | modrm_val = *(unsigned long *) | |
603 | decode_register(modrm_rm, _regs, d & ByteOp); | |
604 | goto modrm_done; | |
605 | } | |
606 | ||
607 | if (ad_bytes == 2) { | |
608 | unsigned bx = _regs[VCPU_REGS_RBX]; | |
609 | unsigned bp = _regs[VCPU_REGS_RBP]; | |
610 | unsigned si = _regs[VCPU_REGS_RSI]; | |
611 | unsigned di = _regs[VCPU_REGS_RDI]; | |
612 | ||
613 | /* 16-bit ModR/M decode. */ | |
614 | switch (modrm_mod) { | |
615 | case 0: | |
616 | if (modrm_rm == 6) | |
617 | modrm_ea += insn_fetch(u16, 2, _eip); | |
618 | break; | |
619 | case 1: | |
620 | modrm_ea += insn_fetch(s8, 1, _eip); | |
621 | break; | |
622 | case 2: | |
623 | modrm_ea += insn_fetch(u16, 2, _eip); | |
624 | break; | |
625 | } | |
626 | switch (modrm_rm) { | |
627 | case 0: | |
628 | modrm_ea += bx + si; | |
629 | break; | |
630 | case 1: | |
631 | modrm_ea += bx + di; | |
632 | break; | |
633 | case 2: | |
634 | modrm_ea += bp + si; | |
635 | break; | |
636 | case 3: | |
637 | modrm_ea += bp + di; | |
638 | break; | |
639 | case 4: | |
640 | modrm_ea += si; | |
641 | break; | |
642 | case 5: | |
643 | modrm_ea += di; | |
644 | break; | |
645 | case 6: | |
646 | if (modrm_mod != 0) | |
647 | modrm_ea += bp; | |
648 | break; | |
649 | case 7: | |
650 | modrm_ea += bx; | |
651 | break; | |
652 | } | |
653 | if (modrm_rm == 2 || modrm_rm == 3 || | |
654 | (modrm_rm == 6 && modrm_mod != 0)) | |
655 | if (!override_base) | |
656 | override_base = &ctxt->ss_base; | |
657 | modrm_ea = (u16)modrm_ea; | |
658 | } else { | |
659 | /* 32/64-bit ModR/M decode. */ | |
660 | switch (modrm_rm) { | |
661 | case 4: | |
662 | case 12: | |
663 | sib = insn_fetch(u8, 1, _eip); | |
664 | index_reg |= (sib >> 3) & 7; | |
665 | base_reg |= sib & 7; | |
666 | scale = sib >> 6; | |
667 | ||
668 | switch (base_reg) { | |
669 | case 5: | |
670 | if (modrm_mod != 0) | |
671 | modrm_ea += _regs[base_reg]; | |
672 | else | |
673 | modrm_ea += insn_fetch(s32, 4, _eip); | |
674 | break; | |
675 | default: | |
676 | modrm_ea += _regs[base_reg]; | |
677 | } | |
678 | switch (index_reg) { | |
679 | case 4: | |
680 | break; | |
681 | default: | |
682 | modrm_ea += _regs[index_reg] << scale; | |
683 | ||
684 | } | |
685 | break; | |
686 | case 5: | |
687 | if (modrm_mod != 0) | |
688 | modrm_ea += _regs[modrm_rm]; | |
689 | else if (mode == X86EMUL_MODE_PROT64) | |
690 | rip_relative = 1; | |
691 | break; | |
692 | default: | |
693 | modrm_ea += _regs[modrm_rm]; | |
694 | break; | |
695 | } | |
696 | switch (modrm_mod) { | |
697 | case 0: | |
698 | if (modrm_rm == 5) | |
699 | modrm_ea += insn_fetch(s32, 4, _eip); | |
700 | break; | |
701 | case 1: | |
702 | modrm_ea += insn_fetch(s8, 1, _eip); | |
703 | break; | |
704 | case 2: | |
705 | modrm_ea += insn_fetch(s32, 4, _eip); | |
706 | break; | |
707 | } | |
708 | } | |
709 | if (!override_base) | |
710 | override_base = &ctxt->ds_base; | |
711 | if (mode == X86EMUL_MODE_PROT64 && | |
712 | override_base != &ctxt->fs_base && | |
713 | override_base != &ctxt->gs_base) | |
714 | override_base = NULL; | |
715 | ||
716 | if (override_base) | |
717 | modrm_ea += *override_base; | |
718 | ||
719 | if (rip_relative) { | |
720 | modrm_ea += _eip; | |
721 | switch (d & SrcMask) { | |
722 | case SrcImmByte: | |
723 | modrm_ea += 1; | |
724 | break; | |
725 | case SrcImm: | |
726 | if (d & ByteOp) | |
727 | modrm_ea += 1; | |
728 | else | |
729 | if (op_bytes == 8) | |
730 | modrm_ea += 4; | |
731 | else | |
732 | modrm_ea += op_bytes; | |
733 | } | |
734 | } | |
735 | if (ad_bytes != 8) | |
736 | modrm_ea = (u32)modrm_ea; | |
737 | cr2 = modrm_ea; | |
738 | modrm_done: | |
739 | ; | |
740 | } | |
741 | ||
6aa8b732 AK |
742 | /* |
743 | * Decode and fetch the source operand: register, memory | |
744 | * or immediate. | |
745 | */ | |
746 | switch (d & SrcMask) { | |
747 | case SrcNone: | |
748 | break; | |
749 | case SrcReg: | |
750 | src.type = OP_REG; | |
751 | if (d & ByteOp) { | |
752 | src.ptr = decode_register(modrm_reg, _regs, | |
753 | (rex_prefix == 0)); | |
754 | src.val = src.orig_val = *(u8 *) src.ptr; | |
755 | src.bytes = 1; | |
756 | } else { | |
757 | src.ptr = decode_register(modrm_reg, _regs, 0); | |
758 | switch ((src.bytes = op_bytes)) { | |
759 | case 2: | |
760 | src.val = src.orig_val = *(u16 *) src.ptr; | |
761 | break; | |
762 | case 4: | |
763 | src.val = src.orig_val = *(u32 *) src.ptr; | |
764 | break; | |
765 | case 8: | |
766 | src.val = src.orig_val = *(u64 *) src.ptr; | |
767 | break; | |
768 | } | |
769 | } | |
770 | break; | |
771 | case SrcMem16: | |
772 | src.bytes = 2; | |
773 | goto srcmem_common; | |
774 | case SrcMem32: | |
775 | src.bytes = 4; | |
776 | goto srcmem_common; | |
777 | case SrcMem: | |
778 | src.bytes = (d & ByteOp) ? 1 : op_bytes; | |
779 | srcmem_common: | |
780 | src.type = OP_MEM; | |
781 | src.ptr = (unsigned long *)cr2; | |
782 | if ((rc = ops->read_emulated((unsigned long)src.ptr, | |
783 | &src.val, src.bytes, ctxt)) != 0) | |
784 | goto done; | |
785 | src.orig_val = src.val; | |
786 | break; | |
787 | case SrcImm: | |
788 | src.type = OP_IMM; | |
789 | src.ptr = (unsigned long *)_eip; | |
790 | src.bytes = (d & ByteOp) ? 1 : op_bytes; | |
791 | if (src.bytes == 8) | |
792 | src.bytes = 4; | |
793 | /* NB. Immediates are sign-extended as necessary. */ | |
794 | switch (src.bytes) { | |
795 | case 1: | |
796 | src.val = insn_fetch(s8, 1, _eip); | |
797 | break; | |
798 | case 2: | |
799 | src.val = insn_fetch(s16, 2, _eip); | |
800 | break; | |
801 | case 4: | |
802 | src.val = insn_fetch(s32, 4, _eip); | |
803 | break; | |
804 | } | |
805 | break; | |
806 | case SrcImmByte: | |
807 | src.type = OP_IMM; | |
808 | src.ptr = (unsigned long *)_eip; | |
809 | src.bytes = 1; | |
810 | src.val = insn_fetch(s8, 1, _eip); | |
811 | break; | |
812 | } | |
813 | ||
038e51de AK |
814 | /* Decode and fetch the destination operand: register or memory. */ |
815 | switch (d & DstMask) { | |
816 | case ImplicitOps: | |
817 | /* Special instructions do their own operand decoding. */ | |
818 | goto special_insn; | |
819 | case DstReg: | |
820 | dst.type = OP_REG; | |
821 | if ((d & ByteOp) | |
822 | && !(twobyte_table && (b == 0xb6 || b == 0xb7))) { | |
823 | dst.ptr = decode_register(modrm_reg, _regs, | |
824 | (rex_prefix == 0)); | |
825 | dst.val = *(u8 *) dst.ptr; | |
826 | dst.bytes = 1; | |
827 | } else { | |
828 | dst.ptr = decode_register(modrm_reg, _regs, 0); | |
829 | switch ((dst.bytes = op_bytes)) { | |
830 | case 2: | |
831 | dst.val = *(u16 *)dst.ptr; | |
832 | break; | |
833 | case 4: | |
834 | dst.val = *(u32 *)dst.ptr; | |
835 | break; | |
836 | case 8: | |
837 | dst.val = *(u64 *)dst.ptr; | |
838 | break; | |
839 | } | |
840 | } | |
841 | break; | |
842 | case DstMem: | |
843 | dst.type = OP_MEM; | |
844 | dst.ptr = (unsigned long *)cr2; | |
845 | dst.bytes = (d & ByteOp) ? 1 : op_bytes; | |
846 | if (d & BitOp) { | |
df513e2c AK |
847 | unsigned long mask = ~(dst.bytes * 8 - 1); |
848 | ||
849 | dst.ptr = (void *)dst.ptr + (src.val & mask) / 8; | |
038e51de AK |
850 | } |
851 | if (!(d & Mov) && /* optimisation - avoid slow emulated read */ | |
852 | ((rc = ops->read_emulated((unsigned long)dst.ptr, | |
853 | &dst.val, dst.bytes, ctxt)) != 0)) | |
854 | goto done; | |
855 | break; | |
856 | } | |
857 | dst.orig_val = dst.val; | |
858 | ||
6aa8b732 AK |
859 | if (twobyte) |
860 | goto twobyte_insn; | |
861 | ||
862 | switch (b) { | |
863 | case 0x00 ... 0x05: | |
864 | add: /* add */ | |
865 | emulate_2op_SrcV("add", src, dst, _eflags); | |
866 | break; | |
867 | case 0x08 ... 0x0d: | |
868 | or: /* or */ | |
869 | emulate_2op_SrcV("or", src, dst, _eflags); | |
870 | break; | |
871 | case 0x10 ... 0x15: | |
872 | adc: /* adc */ | |
873 | emulate_2op_SrcV("adc", src, dst, _eflags); | |
874 | break; | |
875 | case 0x18 ... 0x1d: | |
876 | sbb: /* sbb */ | |
877 | emulate_2op_SrcV("sbb", src, dst, _eflags); | |
878 | break; | |
879 | case 0x20 ... 0x25: | |
880 | and: /* and */ | |
881 | emulate_2op_SrcV("and", src, dst, _eflags); | |
882 | break; | |
883 | case 0x28 ... 0x2d: | |
884 | sub: /* sub */ | |
885 | emulate_2op_SrcV("sub", src, dst, _eflags); | |
886 | break; | |
887 | case 0x30 ... 0x35: | |
888 | xor: /* xor */ | |
889 | emulate_2op_SrcV("xor", src, dst, _eflags); | |
890 | break; | |
891 | case 0x38 ... 0x3d: | |
892 | cmp: /* cmp */ | |
893 | emulate_2op_SrcV("cmp", src, dst, _eflags); | |
894 | break; | |
895 | case 0x63: /* movsxd */ | |
896 | if (mode != X86EMUL_MODE_PROT64) | |
897 | goto cannot_emulate; | |
898 | dst.val = (s32) src.val; | |
899 | break; | |
900 | case 0x80 ... 0x83: /* Grp1 */ | |
901 | switch (modrm_reg) { | |
902 | case 0: | |
903 | goto add; | |
904 | case 1: | |
905 | goto or; | |
906 | case 2: | |
907 | goto adc; | |
908 | case 3: | |
909 | goto sbb; | |
910 | case 4: | |
911 | goto and; | |
912 | case 5: | |
913 | goto sub; | |
914 | case 6: | |
915 | goto xor; | |
916 | case 7: | |
917 | goto cmp; | |
918 | } | |
919 | break; | |
920 | case 0x84 ... 0x85: | |
921 | test: /* test */ | |
922 | emulate_2op_SrcV("test", src, dst, _eflags); | |
923 | break; | |
924 | case 0x86 ... 0x87: /* xchg */ | |
925 | /* Write back the register source. */ | |
926 | switch (dst.bytes) { | |
927 | case 1: | |
928 | *(u8 *) src.ptr = (u8) dst.val; | |
929 | break; | |
930 | case 2: | |
931 | *(u16 *) src.ptr = (u16) dst.val; | |
932 | break; | |
933 | case 4: | |
934 | *src.ptr = (u32) dst.val; | |
935 | break; /* 64b reg: zero-extend */ | |
936 | case 8: | |
937 | *src.ptr = dst.val; | |
938 | break; | |
939 | } | |
940 | /* | |
941 | * Write back the memory destination with implicit LOCK | |
942 | * prefix. | |
943 | */ | |
944 | dst.val = src.val; | |
945 | lock_prefix = 1; | |
946 | break; | |
947 | case 0xa0 ... 0xa1: /* mov */ | |
948 | dst.ptr = (unsigned long *)&_regs[VCPU_REGS_RAX]; | |
949 | dst.val = src.val; | |
950 | _eip += ad_bytes; /* skip src displacement */ | |
951 | break; | |
952 | case 0xa2 ... 0xa3: /* mov */ | |
953 | dst.val = (unsigned long)_regs[VCPU_REGS_RAX]; | |
954 | _eip += ad_bytes; /* skip dst displacement */ | |
955 | break; | |
956 | case 0x88 ... 0x8b: /* mov */ | |
957 | case 0xc6 ... 0xc7: /* mov (sole member of Grp11) */ | |
958 | dst.val = src.val; | |
959 | break; | |
960 | case 0x8f: /* pop (sole member of Grp1a) */ | |
961 | /* 64-bit mode: POP always pops a 64-bit operand. */ | |
962 | if (mode == X86EMUL_MODE_PROT64) | |
963 | dst.bytes = 8; | |
964 | if ((rc = ops->read_std(register_address(ctxt->ss_base, | |
965 | _regs[VCPU_REGS_RSP]), | |
966 | &dst.val, dst.bytes, ctxt)) != 0) | |
967 | goto done; | |
968 | register_address_increment(_regs[VCPU_REGS_RSP], dst.bytes); | |
969 | break; | |
970 | case 0xc0 ... 0xc1: | |
971 | grp2: /* Grp2 */ | |
972 | switch (modrm_reg) { | |
973 | case 0: /* rol */ | |
974 | emulate_2op_SrcB("rol", src, dst, _eflags); | |
975 | break; | |
976 | case 1: /* ror */ | |
977 | emulate_2op_SrcB("ror", src, dst, _eflags); | |
978 | break; | |
979 | case 2: /* rcl */ | |
980 | emulate_2op_SrcB("rcl", src, dst, _eflags); | |
981 | break; | |
982 | case 3: /* rcr */ | |
983 | emulate_2op_SrcB("rcr", src, dst, _eflags); | |
984 | break; | |
985 | case 4: /* sal/shl */ | |
986 | case 6: /* sal/shl */ | |
987 | emulate_2op_SrcB("sal", src, dst, _eflags); | |
988 | break; | |
989 | case 5: /* shr */ | |
990 | emulate_2op_SrcB("shr", src, dst, _eflags); | |
991 | break; | |
992 | case 7: /* sar */ | |
993 | emulate_2op_SrcB("sar", src, dst, _eflags); | |
994 | break; | |
995 | } | |
996 | break; | |
997 | case 0xd0 ... 0xd1: /* Grp2 */ | |
998 | src.val = 1; | |
999 | goto grp2; | |
1000 | case 0xd2 ... 0xd3: /* Grp2 */ | |
1001 | src.val = _regs[VCPU_REGS_RCX]; | |
1002 | goto grp2; | |
1003 | case 0xf6 ... 0xf7: /* Grp3 */ | |
1004 | switch (modrm_reg) { | |
1005 | case 0 ... 1: /* test */ | |
1006 | /* | |
1007 | * Special case in Grp3: test has an immediate | |
1008 | * source operand. | |
1009 | */ | |
1010 | src.type = OP_IMM; | |
1011 | src.ptr = (unsigned long *)_eip; | |
1012 | src.bytes = (d & ByteOp) ? 1 : op_bytes; | |
1013 | if (src.bytes == 8) | |
1014 | src.bytes = 4; | |
1015 | switch (src.bytes) { | |
1016 | case 1: | |
1017 | src.val = insn_fetch(s8, 1, _eip); | |
1018 | break; | |
1019 | case 2: | |
1020 | src.val = insn_fetch(s16, 2, _eip); | |
1021 | break; | |
1022 | case 4: | |
1023 | src.val = insn_fetch(s32, 4, _eip); | |
1024 | break; | |
1025 | } | |
1026 | goto test; | |
1027 | case 2: /* not */ | |
1028 | dst.val = ~dst.val; | |
1029 | break; | |
1030 | case 3: /* neg */ | |
1031 | emulate_1op("neg", dst, _eflags); | |
1032 | break; | |
1033 | default: | |
1034 | goto cannot_emulate; | |
1035 | } | |
1036 | break; | |
1037 | case 0xfe ... 0xff: /* Grp4/Grp5 */ | |
1038 | switch (modrm_reg) { | |
1039 | case 0: /* inc */ | |
1040 | emulate_1op("inc", dst, _eflags); | |
1041 | break; | |
1042 | case 1: /* dec */ | |
1043 | emulate_1op("dec", dst, _eflags); | |
1044 | break; | |
1045 | case 6: /* push */ | |
1046 | /* 64-bit mode: PUSH always pushes a 64-bit operand. */ | |
1047 | if (mode == X86EMUL_MODE_PROT64) { | |
1048 | dst.bytes = 8; | |
1049 | if ((rc = ops->read_std((unsigned long)dst.ptr, | |
1050 | &dst.val, 8, | |
1051 | ctxt)) != 0) | |
1052 | goto done; | |
1053 | } | |
1054 | register_address_increment(_regs[VCPU_REGS_RSP], | |
1055 | -dst.bytes); | |
1056 | if ((rc = ops->write_std( | |
1057 | register_address(ctxt->ss_base, | |
1058 | _regs[VCPU_REGS_RSP]), | |
4c690a1e | 1059 | &dst.val, dst.bytes, ctxt)) != 0) |
6aa8b732 | 1060 | goto done; |
02c03a32 | 1061 | no_wb = 1; |
6aa8b732 AK |
1062 | break; |
1063 | default: | |
1064 | goto cannot_emulate; | |
1065 | } | |
1066 | break; | |
1067 | } | |
1068 | ||
1069 | writeback: | |
02c03a32 | 1070 | if (!no_wb) { |
6aa8b732 AK |
1071 | switch (dst.type) { |
1072 | case OP_REG: | |
1073 | /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */ | |
1074 | switch (dst.bytes) { | |
1075 | case 1: | |
1076 | *(u8 *)dst.ptr = (u8)dst.val; | |
1077 | break; | |
1078 | case 2: | |
1079 | *(u16 *)dst.ptr = (u16)dst.val; | |
1080 | break; | |
1081 | case 4: | |
1082 | *dst.ptr = (u32)dst.val; | |
1083 | break; /* 64b: zero-ext */ | |
1084 | case 8: | |
1085 | *dst.ptr = dst.val; | |
1086 | break; | |
1087 | } | |
1088 | break; | |
1089 | case OP_MEM: | |
1090 | if (lock_prefix) | |
1091 | rc = ops->cmpxchg_emulated((unsigned long)dst. | |
4c690a1e AK |
1092 | ptr, &dst.orig_val, |
1093 | &dst.val, dst.bytes, | |
6aa8b732 AK |
1094 | ctxt); |
1095 | else | |
1096 | rc = ops->write_emulated((unsigned long)dst.ptr, | |
4c690a1e | 1097 | &dst.val, dst.bytes, |
6aa8b732 AK |
1098 | ctxt); |
1099 | if (rc != 0) | |
1100 | goto done; | |
1101 | default: | |
1102 | break; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | /* Commit shadow register state. */ | |
1107 | memcpy(ctxt->vcpu->regs, _regs, sizeof _regs); | |
1108 | ctxt->eflags = _eflags; | |
1109 | ctxt->vcpu->rip = _eip; | |
1110 | ||
1111 | done: | |
1112 | return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0; | |
1113 | ||
1114 | special_insn: | |
1115 | if (twobyte) | |
1116 | goto twobyte_special_insn; | |
1117 | if (rep_prefix) { | |
1118 | if (_regs[VCPU_REGS_RCX] == 0) { | |
1119 | ctxt->vcpu->rip = _eip; | |
1120 | goto done; | |
1121 | } | |
1122 | _regs[VCPU_REGS_RCX]--; | |
1123 | _eip = ctxt->vcpu->rip; | |
1124 | } | |
1125 | switch (b) { | |
1126 | case 0xa4 ... 0xa5: /* movs */ | |
1127 | dst.type = OP_MEM; | |
1128 | dst.bytes = (d & ByteOp) ? 1 : op_bytes; | |
1129 | dst.ptr = (unsigned long *)register_address(ctxt->es_base, | |
1130 | _regs[VCPU_REGS_RDI]); | |
1131 | if ((rc = ops->read_emulated(register_address( | |
1132 | override_base ? *override_base : ctxt->ds_base, | |
1133 | _regs[VCPU_REGS_RSI]), &dst.val, dst.bytes, ctxt)) != 0) | |
1134 | goto done; | |
1135 | register_address_increment(_regs[VCPU_REGS_RSI], | |
1136 | (_eflags & EFLG_DF) ? -dst.bytes : dst.bytes); | |
1137 | register_address_increment(_regs[VCPU_REGS_RDI], | |
1138 | (_eflags & EFLG_DF) ? -dst.bytes : dst.bytes); | |
1139 | break; | |
1140 | case 0xa6 ... 0xa7: /* cmps */ | |
1141 | DPRINTF("Urk! I don't handle CMPS.\n"); | |
1142 | goto cannot_emulate; | |
1143 | case 0xaa ... 0xab: /* stos */ | |
1144 | dst.type = OP_MEM; | |
1145 | dst.bytes = (d & ByteOp) ? 1 : op_bytes; | |
1146 | dst.ptr = (unsigned long *)cr2; | |
1147 | dst.val = _regs[VCPU_REGS_RAX]; | |
1148 | register_address_increment(_regs[VCPU_REGS_RDI], | |
1149 | (_eflags & EFLG_DF) ? -dst.bytes : dst.bytes); | |
1150 | break; | |
1151 | case 0xac ... 0xad: /* lods */ | |
1152 | dst.type = OP_REG; | |
1153 | dst.bytes = (d & ByteOp) ? 1 : op_bytes; | |
1154 | dst.ptr = (unsigned long *)&_regs[VCPU_REGS_RAX]; | |
1155 | if ((rc = ops->read_emulated(cr2, &dst.val, dst.bytes, ctxt)) != 0) | |
1156 | goto done; | |
1157 | register_address_increment(_regs[VCPU_REGS_RSI], | |
1158 | (_eflags & EFLG_DF) ? -dst.bytes : dst.bytes); | |
1159 | break; | |
1160 | case 0xae ... 0xaf: /* scas */ | |
1161 | DPRINTF("Urk! I don't handle SCAS.\n"); | |
1162 | goto cannot_emulate; | |
72d6e5a0 AK |
1163 | case 0xf4: /* hlt */ |
1164 | ctxt->vcpu->halt_request = 1; | |
1165 | goto done; | |
d9413cd7 NK |
1166 | case 0xc3: /* ret */ |
1167 | dst.ptr = &_eip; | |
1168 | goto pop_instruction; | |
7f0aaee0 NK |
1169 | case 0x58 ... 0x5f: /* pop reg */ |
1170 | dst.ptr = (unsigned long *)&_regs[b & 0x7]; | |
1171 | ||
d9413cd7 | 1172 | pop_instruction: |
7f0aaee0 NK |
1173 | if ((rc = ops->read_std(register_address(ctxt->ss_base, |
1174 | _regs[VCPU_REGS_RSP]), dst.ptr, op_bytes, ctxt)) != 0) | |
1175 | goto done; | |
1176 | ||
d9413cd7 | 1177 | register_address_increment(_regs[VCPU_REGS_RSP], op_bytes); |
02c03a32 | 1178 | no_wb = 1; /* Disable writeback. */ |
7f0aaee0 | 1179 | break; |
6aa8b732 AK |
1180 | } |
1181 | goto writeback; | |
1182 | ||
1183 | twobyte_insn: | |
1184 | switch (b) { | |
1185 | case 0x01: /* lgdt, lidt, lmsw */ | |
d37c8557 AJ |
1186 | /* Disable writeback. */ |
1187 | no_wb = 1; | |
6aa8b732 AK |
1188 | switch (modrm_reg) { |
1189 | u16 size; | |
1190 | unsigned long address; | |
1191 | ||
1192 | case 2: /* lgdt */ | |
1193 | rc = read_descriptor(ctxt, ops, src.ptr, | |
1194 | &size, &address, op_bytes); | |
1195 | if (rc) | |
1196 | goto done; | |
1197 | realmode_lgdt(ctxt->vcpu, size, address); | |
1198 | break; | |
1199 | case 3: /* lidt */ | |
1200 | rc = read_descriptor(ctxt, ops, src.ptr, | |
1201 | &size, &address, op_bytes); | |
1202 | if (rc) | |
1203 | goto done; | |
1204 | realmode_lidt(ctxt->vcpu, size, address); | |
1205 | break; | |
1206 | case 4: /* smsw */ | |
1207 | if (modrm_mod != 3) | |
1208 | goto cannot_emulate; | |
1209 | *(u16 *)&_regs[modrm_rm] | |
1210 | = realmode_get_cr(ctxt->vcpu, 0); | |
1211 | break; | |
1212 | case 6: /* lmsw */ | |
1213 | if (modrm_mod != 3) | |
1214 | goto cannot_emulate; | |
1215 | realmode_lmsw(ctxt->vcpu, (u16)modrm_val, &_eflags); | |
1216 | break; | |
1217 | case 7: /* invlpg*/ | |
1218 | emulate_invlpg(ctxt->vcpu, cr2); | |
1219 | break; | |
1220 | default: | |
1221 | goto cannot_emulate; | |
1222 | } | |
1223 | break; | |
1224 | case 0x21: /* mov from dr to reg */ | |
bac27d35 | 1225 | no_wb = 1; |
6aa8b732 AK |
1226 | if (modrm_mod != 3) |
1227 | goto cannot_emulate; | |
1228 | rc = emulator_get_dr(ctxt, modrm_reg, &_regs[modrm_rm]); | |
1229 | break; | |
1230 | case 0x23: /* mov from reg to dr */ | |
bac27d35 | 1231 | no_wb = 1; |
6aa8b732 AK |
1232 | if (modrm_mod != 3) |
1233 | goto cannot_emulate; | |
1234 | rc = emulator_set_dr(ctxt, modrm_reg, _regs[modrm_rm]); | |
1235 | break; | |
1236 | case 0x40 ... 0x4f: /* cmov */ | |
1237 | dst.val = dst.orig_val = src.val; | |
1238 | d &= ~Mov; /* default to no move */ | |
1239 | /* | |
1240 | * First, assume we're decoding an even cmov opcode | |
1241 | * (lsb == 0). | |
1242 | */ | |
1243 | switch ((b & 15) >> 1) { | |
1244 | case 0: /* cmovo */ | |
1245 | d |= (_eflags & EFLG_OF) ? Mov : 0; | |
1246 | break; | |
1247 | case 1: /* cmovb/cmovc/cmovnae */ | |
1248 | d |= (_eflags & EFLG_CF) ? Mov : 0; | |
1249 | break; | |
1250 | case 2: /* cmovz/cmove */ | |
1251 | d |= (_eflags & EFLG_ZF) ? Mov : 0; | |
1252 | break; | |
1253 | case 3: /* cmovbe/cmovna */ | |
1254 | d |= (_eflags & (EFLG_CF | EFLG_ZF)) ? Mov : 0; | |
1255 | break; | |
1256 | case 4: /* cmovs */ | |
1257 | d |= (_eflags & EFLG_SF) ? Mov : 0; | |
1258 | break; | |
1259 | case 5: /* cmovp/cmovpe */ | |
1260 | d |= (_eflags & EFLG_PF) ? Mov : 0; | |
1261 | break; | |
1262 | case 7: /* cmovle/cmovng */ | |
1263 | d |= (_eflags & EFLG_ZF) ? Mov : 0; | |
1264 | /* fall through */ | |
1265 | case 6: /* cmovl/cmovnge */ | |
1266 | d |= (!(_eflags & EFLG_SF) != | |
1267 | !(_eflags & EFLG_OF)) ? Mov : 0; | |
1268 | break; | |
1269 | } | |
1270 | /* Odd cmov opcodes (lsb == 1) have inverted sense. */ | |
1271 | d ^= (b & 1) ? Mov : 0; | |
1272 | break; | |
1273 | case 0xb0 ... 0xb1: /* cmpxchg */ | |
1274 | /* | |
1275 | * Save real source value, then compare EAX against | |
1276 | * destination. | |
1277 | */ | |
1278 | src.orig_val = src.val; | |
1279 | src.val = _regs[VCPU_REGS_RAX]; | |
1280 | emulate_2op_SrcV("cmp", src, dst, _eflags); | |
1281 | /* Always write back. The question is: where to? */ | |
1282 | d |= Mov; | |
1283 | if (_eflags & EFLG_ZF) { | |
1284 | /* Success: write back to memory. */ | |
1285 | dst.val = src.orig_val; | |
1286 | } else { | |
1287 | /* Failure: write the value we saw to EAX. */ | |
1288 | dst.type = OP_REG; | |
1289 | dst.ptr = (unsigned long *)&_regs[VCPU_REGS_RAX]; | |
1290 | } | |
1291 | break; | |
1292 | case 0xa3: | |
1293 | bt: /* bt */ | |
1294 | src.val &= (dst.bytes << 3) - 1; /* only subword offset */ | |
1295 | emulate_2op_SrcV_nobyte("bt", src, dst, _eflags); | |
1296 | break; | |
1297 | case 0xb3: | |
1298 | btr: /* btr */ | |
1299 | src.val &= (dst.bytes << 3) - 1; /* only subword offset */ | |
1300 | emulate_2op_SrcV_nobyte("btr", src, dst, _eflags); | |
1301 | break; | |
1302 | case 0xab: | |
1303 | bts: /* bts */ | |
1304 | src.val &= (dst.bytes << 3) - 1; /* only subword offset */ | |
1305 | emulate_2op_SrcV_nobyte("bts", src, dst, _eflags); | |
1306 | break; | |
1307 | case 0xb6 ... 0xb7: /* movzx */ | |
1308 | dst.bytes = op_bytes; | |
1309 | dst.val = (d & ByteOp) ? (u8) src.val : (u16) src.val; | |
1310 | break; | |
1311 | case 0xbb: | |
1312 | btc: /* btc */ | |
1313 | src.val &= (dst.bytes << 3) - 1; /* only subword offset */ | |
1314 | emulate_2op_SrcV_nobyte("btc", src, dst, _eflags); | |
1315 | break; | |
1316 | case 0xba: /* Grp8 */ | |
1317 | switch (modrm_reg & 3) { | |
1318 | case 0: | |
1319 | goto bt; | |
1320 | case 1: | |
1321 | goto bts; | |
1322 | case 2: | |
1323 | goto btr; | |
1324 | case 3: | |
1325 | goto btc; | |
1326 | } | |
1327 | break; | |
1328 | case 0xbe ... 0xbf: /* movsx */ | |
1329 | dst.bytes = op_bytes; | |
1330 | dst.val = (d & ByteOp) ? (s8) src.val : (s16) src.val; | |
1331 | break; | |
1332 | } | |
1333 | goto writeback; | |
1334 | ||
1335 | twobyte_special_insn: | |
1336 | /* Disable writeback. */ | |
02c03a32 | 1337 | no_wb = 1; |
6aa8b732 | 1338 | switch (b) { |
687fdbfe AK |
1339 | case 0x09: /* wbinvd */ |
1340 | break; | |
6aa8b732 AK |
1341 | case 0x0d: /* GrpP (prefetch) */ |
1342 | case 0x18: /* Grp16 (prefetch/nop) */ | |
1343 | break; | |
1344 | case 0x06: | |
1345 | emulate_clts(ctxt->vcpu); | |
1346 | break; | |
1347 | case 0x20: /* mov cr, reg */ | |
1348 | if (modrm_mod != 3) | |
1349 | goto cannot_emulate; | |
1350 | _regs[modrm_rm] = realmode_get_cr(ctxt->vcpu, modrm_reg); | |
1351 | break; | |
1352 | case 0x22: /* mov reg, cr */ | |
1353 | if (modrm_mod != 3) | |
1354 | goto cannot_emulate; | |
1355 | realmode_set_cr(ctxt->vcpu, modrm_reg, modrm_val, &_eflags); | |
1356 | break; | |
35f3f286 AK |
1357 | case 0x30: |
1358 | /* wrmsr */ | |
1359 | msr_data = (u32)_regs[VCPU_REGS_RAX] | |
1360 | | ((u64)_regs[VCPU_REGS_RDX] << 32); | |
1361 | rc = kvm_set_msr(ctxt->vcpu, _regs[VCPU_REGS_RCX], msr_data); | |
1362 | if (rc) { | |
1363 | kvm_arch_ops->inject_gp(ctxt->vcpu, 0); | |
1364 | _eip = ctxt->vcpu->rip; | |
1365 | } | |
1366 | rc = X86EMUL_CONTINUE; | |
1367 | break; | |
1368 | case 0x32: | |
1369 | /* rdmsr */ | |
1370 | rc = kvm_get_msr(ctxt->vcpu, _regs[VCPU_REGS_RCX], &msr_data); | |
1371 | if (rc) { | |
1372 | kvm_arch_ops->inject_gp(ctxt->vcpu, 0); | |
1373 | _eip = ctxt->vcpu->rip; | |
1374 | } else { | |
1375 | _regs[VCPU_REGS_RAX] = (u32)msr_data; | |
1376 | _regs[VCPU_REGS_RDX] = msr_data >> 32; | |
1377 | } | |
1378 | rc = X86EMUL_CONTINUE; | |
1379 | break; | |
6aa8b732 | 1380 | case 0xc7: /* Grp9 (cmpxchg8b) */ |
6aa8b732 | 1381 | { |
4c690a1e | 1382 | u64 old, new; |
6aa8b732 AK |
1383 | if ((rc = ops->read_emulated(cr2, &old, 8, ctxt)) != 0) |
1384 | goto done; | |
1385 | if (((u32) (old >> 0) != (u32) _regs[VCPU_REGS_RAX]) || | |
1386 | ((u32) (old >> 32) != (u32) _regs[VCPU_REGS_RDX])) { | |
1387 | _regs[VCPU_REGS_RAX] = (u32) (old >> 0); | |
1388 | _regs[VCPU_REGS_RDX] = (u32) (old >> 32); | |
1389 | _eflags &= ~EFLG_ZF; | |
1390 | } else { | |
4c690a1e AK |
1391 | new = ((u64)_regs[VCPU_REGS_RCX] << 32) |
1392 | | (u32) _regs[VCPU_REGS_RBX]; | |
1393 | if ((rc = ops->cmpxchg_emulated(cr2, &old, | |
1394 | &new, 8, ctxt)) != 0) | |
6aa8b732 AK |
1395 | goto done; |
1396 | _eflags |= EFLG_ZF; | |
1397 | } | |
1398 | break; | |
1399 | } | |
6aa8b732 AK |
1400 | } |
1401 | goto writeback; | |
1402 | ||
1403 | cannot_emulate: | |
1404 | DPRINTF("Cannot emulate %02x\n", b); | |
1405 | return -1; | |
1406 | } | |
1407 | ||
1408 | #ifdef __XEN__ | |
1409 | ||
1410 | #include <asm/mm.h> | |
1411 | #include <asm/uaccess.h> | |
1412 | ||
1413 | int | |
1414 | x86_emulate_read_std(unsigned long addr, | |
1415 | unsigned long *val, | |
1416 | unsigned int bytes, struct x86_emulate_ctxt *ctxt) | |
1417 | { | |
1418 | unsigned int rc; | |
1419 | ||
1420 | *val = 0; | |
1421 | ||
1422 | if ((rc = copy_from_user((void *)val, (void *)addr, bytes)) != 0) { | |
1423 | propagate_page_fault(addr + bytes - rc, 0); /* read fault */ | |
1424 | return X86EMUL_PROPAGATE_FAULT; | |
1425 | } | |
1426 | ||
1427 | return X86EMUL_CONTINUE; | |
1428 | } | |
1429 | ||
1430 | int | |
1431 | x86_emulate_write_std(unsigned long addr, | |
1432 | unsigned long val, | |
1433 | unsigned int bytes, struct x86_emulate_ctxt *ctxt) | |
1434 | { | |
1435 | unsigned int rc; | |
1436 | ||
1437 | if ((rc = copy_to_user((void *)addr, (void *)&val, bytes)) != 0) { | |
1438 | propagate_page_fault(addr + bytes - rc, PGERR_write_access); | |
1439 | return X86EMUL_PROPAGATE_FAULT; | |
1440 | } | |
1441 | ||
1442 | return X86EMUL_CONTINUE; | |
1443 | } | |
1444 | ||
1445 | #endif |