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Avi Kivity6aa8b732006-12-10 02:21:36 -08001/******************************************************************************
Avi Kivity56e82312009-08-12 15:04:37 +03002 * emulate.c
Avi Kivity6aa8b732006-12-10 02:21:36 -08003 *
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
Rusty Russelldcc07662007-07-17 23:16:56 +10009 * privileged instructions:
Avi Kivity6aa8b732006-12-10 02:21:36 -080010 *
11 * Copyright (C) 2006 Qumranet
Nicolas Kaiser9611c182010-10-06 14:23:22 +020012 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
Avi Kivity6aa8b732006-12-10 02:21:36 -080013 *
14 * Avi Kivity <avi@qumranet.com>
15 * Yaniv Kamay <yaniv@qumranet.com>
16 *
17 * This work is licensed under the terms of the GNU GPL, version 2. See
18 * the COPYING file in the top-level directory.
19 *
20 * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
21 */
22
Avi Kivityedf88412007-12-16 11:02:48 +020023#include <linux/kvm_host.h>
Marcelo Tosatti5fdbf972008-06-27 14:58:02 -030024#include "kvm_cache_regs.h"
Avi Kivity6aa8b732006-12-10 02:21:36 -080025#include <linux/module.h>
Avi Kivity56e82312009-08-12 15:04:37 +030026#include <asm/kvm_emulate.h>
Avi Kivity6aa8b732006-12-10 02:21:36 -080027
Avi Kivity3eeb3282010-01-21 15:31:48 +020028#include "x86.h"
Gleb Natapov38ba30b2010-03-18 15:20:17 +020029#include "tss.h"
Andre Przywarae99f0502009-06-17 15:50:33 +020030
Avi Kivity6aa8b732006-12-10 02:21:36 -080031/*
32 * Opcode effective-address decode tables.
33 * Note that we only emulate instructions that have at least one memory
34 * operand (excluding implicit stack references). We assume that stack
35 * references and instruction fetches will never occur in special memory
36 * areas that require emulation. So, for example, 'mov <imm>,<reg>' need
37 * not be handled.
38 */
39
40/* Operand sizes: 8-bit operands or specified/overridden size. */
Avi Kivityab85b122010-07-29 15:11:49 +030041#define ByteOp (1<<0) /* 8-bit operands. */
Avi Kivity6aa8b732006-12-10 02:21:36 -080042/* Destination operand type. */
Avi Kivityab85b122010-07-29 15:11:49 +030043#define ImplicitOps (1<<1) /* Implicit in opcode. No generic decode. */
44#define DstReg (2<<1) /* Register operand. */
45#define DstMem (3<<1) /* Memory operand. */
46#define DstAcc (4<<1) /* Destination Accumulator */
47#define DstDI (5<<1) /* Destination is in ES:(E)DI */
48#define DstMem64 (6<<1) /* 64bit memory operand */
Wei Yongjun943858e2010-08-06 11:36:51 +080049#define DstImmUByte (7<<1) /* 8-bit unsigned immediate operand */
Marcelo Tosatti221192b2011-05-30 15:23:14 -030050#define DstDX (8<<1) /* Destination is in DX register */
51#define DstMask (0xf<<1)
Avi Kivity6aa8b732006-12-10 02:21:36 -080052/* Source operand type. */
Marcelo Tosatti221192b2011-05-30 15:23:14 -030053#define SrcNone (0<<5) /* No source operand. */
54#define SrcReg (1<<5) /* Register operand. */
55#define SrcMem (2<<5) /* Memory operand. */
56#define SrcMem16 (3<<5) /* Memory operand (16-bit). */
57#define SrcMem32 (4<<5) /* Memory operand (32-bit). */
58#define SrcImm (5<<5) /* Immediate operand. */
59#define SrcImmByte (6<<5) /* 8-bit sign-extended immediate operand. */
60#define SrcOne (7<<5) /* Implied '1' */
61#define SrcImmUByte (8<<5) /* 8-bit unsigned immediate operand. */
62#define SrcImmU (9<<5) /* Immediate operand, unsigned */
63#define SrcSI (0xa<<5) /* Source is in the DS:RSI */
64#define SrcImmFAddr (0xb<<5) /* Source is immediate far address */
65#define SrcMemFAddr (0xc<<5) /* Source is far address in memory */
66#define SrcAcc (0xd<<5) /* Source Accumulator */
67#define SrcImmU16 (0xe<<5) /* Immediate operand, unsigned, 16 bits */
68#define SrcDX (0xf<<5) /* Source is in DX register */
69#define SrcMask (0xf<<5)
Avi Kivity6aa8b732006-12-10 02:21:36 -080070/* Generic ModRM decode. */
Marcelo Tosatti221192b2011-05-30 15:23:14 -030071#define ModRM (1<<9)
Avi Kivity6aa8b732006-12-10 02:21:36 -080072/* Destination is only written; never read. */
Marcelo Tosatti221192b2011-05-30 15:23:14 -030073#define Mov (1<<10)
74#define BitOp (1<<11)
75#define MemAbs (1<<12) /* Memory operand is absolute displacement */
76#define String (1<<13) /* String instruction (rep capable) */
77#define Stack (1<<14) /* Stack instruction (push/pop) */
78#define GroupMask (7<<15) /* Opcode uses one of the group mechanisms */
79#define Group (1<<15) /* Bits 3:5 of modrm byte extend opcode */
80#define GroupDual (2<<15) /* Alternate decoding of mod == 3 */
81#define Prefix (3<<15) /* Instruction varies with 66/f2/f3 prefix */
82#define RMExt (4<<15) /* Opcode extension in ModRM r/m if mod == 3 */
83#define Sse (1<<18) /* SSE Vector instruction */
Mohammed Gamald8769fe2009-08-23 14:24:25 +030084/* Misc flags */
Joerg Roedel8ea7d6a2011-04-04 12:39:26 +020085#define Prot (1<<21) /* instruction generates #UD if not in prot-mode */
Avi Kivityd8671622011-02-01 16:32:03 +020086#define VendorSpecific (1<<22) /* Vendor specific instruction */
Avi Kivity5a506b12010-08-01 15:10:29 +030087#define NoAccess (1<<23) /* Don't access memory (lea/invlpg/verr etc) */
Avi Kivity7f9b4b72010-08-01 14:46:54 +030088#define Op3264 (1<<24) /* Operand is 64b in long mode, 32b otherwise */
Avi Kivity047a4812010-07-26 14:37:47 +030089#define Undefined (1<<25) /* No Such Instruction */
Gleb Natapovd380a5e2010-02-10 14:21:36 +020090#define Lock (1<<26) /* lock prefix is allowed for the instruction */
Gleb Natapove92805a2010-02-10 14:21:35 +020091#define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */
Mohammed Gamald8769fe2009-08-23 14:24:25 +030092#define No64 (1<<28)
Guillaume Thouvenin0dc8d102008-12-04 14:26:42 +010093/* Source 2 operand type */
94#define Src2None (0<<29)
95#define Src2CL (1<<29)
96#define Src2ImmByte (2<<29)
97#define Src2One (3<<29)
Avi Kivity7db41eb2010-08-18 19:25:28 +030098#define Src2Imm (4<<29)
Guillaume Thouvenin0dc8d102008-12-04 14:26:42 +010099#define Src2Mask (7<<29)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800100
Avi Kivityd0e53322010-07-29 15:11:54 +0300101#define X2(x...) x, x
102#define X3(x...) X2(x), x
103#define X4(x...) X2(x), X2(x)
104#define X5(x...) X4(x), x
105#define X6(x...) X4(x), X2(x)
106#define X7(x...) X4(x), X3(x)
107#define X8(x...) X4(x), X4(x)
108#define X16(x...) X8(x), X8(x)
Avi Kivity83babbc2010-07-26 14:37:39 +0300109
Avi Kivityd65b1de2010-07-29 15:11:35 +0300110struct opcode {
111 u32 flags;
Avi Kivityc4f035c2011-04-04 12:39:22 +0200112 u8 intercept;
Avi Kivity120df892010-07-29 15:11:39 +0300113 union {
Avi Kivityef65c882010-07-29 15:11:51 +0300114 int (*execute)(struct x86_emulate_ctxt *ctxt);
Avi Kivity120df892010-07-29 15:11:39 +0300115 struct opcode *group;
116 struct group_dual *gdual;
Avi Kivity0d7cdee2011-03-29 11:34:38 +0200117 struct gprefix *gprefix;
Avi Kivity120df892010-07-29 15:11:39 +0300118 } u;
Joerg Roedeld09beab2011-04-04 12:39:25 +0200119 int (*check_perm)(struct x86_emulate_ctxt *ctxt);
Avi Kivity120df892010-07-29 15:11:39 +0300120};
121
122struct group_dual {
123 struct opcode mod012[8];
124 struct opcode mod3[8];
Avi Kivityd65b1de2010-07-29 15:11:35 +0300125};
126
Avi Kivity0d7cdee2011-03-29 11:34:38 +0200127struct gprefix {
128 struct opcode pfx_no;
129 struct opcode pfx_66;
130 struct opcode pfx_f2;
131 struct opcode pfx_f3;
132};
133
Avi Kivity6aa8b732006-12-10 02:21:36 -0800134/* EFLAGS bit definitions. */
Gleb Natapovd4c6a152010-02-10 14:21:34 +0200135#define EFLG_ID (1<<21)
136#define EFLG_VIP (1<<20)
137#define EFLG_VIF (1<<19)
138#define EFLG_AC (1<<18)
Andre Przywarab1d86142009-06-17 15:50:32 +0200139#define EFLG_VM (1<<17)
140#define EFLG_RF (1<<16)
Gleb Natapovd4c6a152010-02-10 14:21:34 +0200141#define EFLG_IOPL (3<<12)
142#define EFLG_NT (1<<14)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800143#define EFLG_OF (1<<11)
144#define EFLG_DF (1<<10)
Andre Przywarab1d86142009-06-17 15:50:32 +0200145#define EFLG_IF (1<<9)
Gleb Natapovd4c6a152010-02-10 14:21:34 +0200146#define EFLG_TF (1<<8)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800147#define EFLG_SF (1<<7)
148#define EFLG_ZF (1<<6)
149#define EFLG_AF (1<<4)
150#define EFLG_PF (1<<2)
151#define EFLG_CF (1<<0)
152
Mohammed Gamal62bd4302010-07-28 12:38:40 +0300153#define EFLG_RESERVED_ZEROS_MASK 0xffc0802a
154#define EFLG_RESERVED_ONE_MASK 2
155
Avi Kivity6aa8b732006-12-10 02:21:36 -0800156/*
157 * Instruction emulation:
158 * Most instructions are emulated directly via a fragment of inline assembly
159 * code. This allows us to save/restore EFLAGS and thus very easily pick up
160 * any modified flags.
161 */
162
Avi Kivity05b3e0c2006-12-13 00:33:45 -0800163#if defined(CONFIG_X86_64)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800164#define _LO32 "k" /* force 32-bit operand */
165#define _STK "%%rsp" /* stack pointer */
166#elif defined(__i386__)
167#define _LO32 "" /* force 32-bit operand */
168#define _STK "%%esp" /* stack pointer */
169#endif
170
171/*
172 * These EFLAGS bits are restored from saved value during emulation, and
173 * any changes are written back to the saved value after emulation.
174 */
175#define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF)
176
177/* Before executing instruction: restore necessary bits in EFLAGS. */
Avi Kivitye934c9c2007-12-06 16:15:02 +0200178#define _PRE_EFLAGS(_sav, _msk, _tmp) \
179 /* EFLAGS = (_sav & _msk) | (EFLAGS & ~_msk); _sav &= ~_msk; */ \
180 "movl %"_sav",%"_LO32 _tmp"; " \
181 "push %"_tmp"; " \
182 "push %"_tmp"; " \
183 "movl %"_msk",%"_LO32 _tmp"; " \
184 "andl %"_LO32 _tmp",("_STK"); " \
185 "pushf; " \
186 "notl %"_LO32 _tmp"; " \
187 "andl %"_LO32 _tmp",("_STK"); " \
188 "andl %"_LO32 _tmp","__stringify(BITS_PER_LONG/4)"("_STK"); " \
189 "pop %"_tmp"; " \
190 "orl %"_LO32 _tmp",("_STK"); " \
191 "popf; " \
192 "pop %"_sav"; "
Avi Kivity6aa8b732006-12-10 02:21:36 -0800193
194/* After executing instruction: write-back necessary bits in EFLAGS. */
195#define _POST_EFLAGS(_sav, _msk, _tmp) \
196 /* _sav |= EFLAGS & _msk; */ \
197 "pushf; " \
198 "pop %"_tmp"; " \
199 "andl %"_msk",%"_LO32 _tmp"; " \
200 "orl %"_LO32 _tmp",%"_sav"; "
201
Avi Kivitydda96d82008-11-26 15:14:10 +0200202#ifdef CONFIG_X86_64
203#define ON64(x) x
204#else
205#define ON64(x)
206#endif
207
Avi Kivityb3b3d252010-08-16 17:49:52 +0300208#define ____emulate_2op(_op, _src, _dst, _eflags, _x, _y, _suffix, _dsttype) \
Avi Kivity6b7ad612008-11-26 15:30:45 +0200209 do { \
210 __asm__ __volatile__ ( \
211 _PRE_EFLAGS("0", "4", "2") \
212 _op _suffix " %"_x"3,%1; " \
213 _POST_EFLAGS("0", "4", "2") \
Avi Kivityfb2c2642010-08-16 17:50:56 +0300214 : "=m" (_eflags), "+q" (*(_dsttype*)&(_dst).val),\
Avi Kivity6b7ad612008-11-26 15:30:45 +0200215 "=&r" (_tmp) \
216 : _y ((_src).val), "i" (EFLAGS_MASK)); \
Avi Kivityf3fd92f2008-11-29 20:38:12 +0200217 } while (0)
Avi Kivity6b7ad612008-11-26 15:30:45 +0200218
219
Avi Kivity6aa8b732006-12-10 02:21:36 -0800220/* Raw emulation: instruction has two explicit operands. */
221#define __emulate_2op_nobyte(_op,_src,_dst,_eflags,_wx,_wy,_lx,_ly,_qx,_qy) \
Avi Kivity6b7ad612008-11-26 15:30:45 +0200222 do { \
223 unsigned long _tmp; \
224 \
225 switch ((_dst).bytes) { \
226 case 2: \
Avi Kivityb3b3d252010-08-16 17:49:52 +0300227 ____emulate_2op(_op,_src,_dst,_eflags,_wx,_wy,"w",u16);\
Avi Kivity6b7ad612008-11-26 15:30:45 +0200228 break; \
229 case 4: \
Avi Kivityb3b3d252010-08-16 17:49:52 +0300230 ____emulate_2op(_op,_src,_dst,_eflags,_lx,_ly,"l",u32);\
Avi Kivity6b7ad612008-11-26 15:30:45 +0200231 break; \
232 case 8: \
Avi Kivityb3b3d252010-08-16 17:49:52 +0300233 ON64(____emulate_2op(_op,_src,_dst,_eflags,_qx,_qy,"q",u64)); \
Avi Kivity6b7ad612008-11-26 15:30:45 +0200234 break; \
235 } \
Avi Kivity6aa8b732006-12-10 02:21:36 -0800236 } while (0)
237
238#define __emulate_2op(_op,_src,_dst,_eflags,_bx,_by,_wx,_wy,_lx,_ly,_qx,_qy) \
239 do { \
Avi Kivity6b7ad612008-11-26 15:30:45 +0200240 unsigned long _tmp; \
Mike Dayd77c26f2007-10-08 09:02:08 -0400241 switch ((_dst).bytes) { \
Avi Kivity6aa8b732006-12-10 02:21:36 -0800242 case 1: \
Avi Kivityb3b3d252010-08-16 17:49:52 +0300243 ____emulate_2op(_op,_src,_dst,_eflags,_bx,_by,"b",u8); \
Avi Kivity6aa8b732006-12-10 02:21:36 -0800244 break; \
245 default: \
246 __emulate_2op_nobyte(_op, _src, _dst, _eflags, \
247 _wx, _wy, _lx, _ly, _qx, _qy); \
248 break; \
249 } \
250 } while (0)
251
252/* Source operand is byte-sized and may be restricted to just %cl. */
253#define emulate_2op_SrcB(_op, _src, _dst, _eflags) \
254 __emulate_2op(_op, _src, _dst, _eflags, \
255 "b", "c", "b", "c", "b", "c", "b", "c")
256
257/* Source operand is byte, word, long or quad sized. */
258#define emulate_2op_SrcV(_op, _src, _dst, _eflags) \
259 __emulate_2op(_op, _src, _dst, _eflags, \
260 "b", "q", "w", "r", _LO32, "r", "", "r")
261
262/* Source operand is word, long or quad sized. */
263#define emulate_2op_SrcV_nobyte(_op, _src, _dst, _eflags) \
264 __emulate_2op_nobyte(_op, _src, _dst, _eflags, \
265 "w", "r", _LO32, "r", "", "r")
266
Guillaume Thouvenind1752262008-12-04 14:29:00 +0100267/* Instruction has three operands and one operand is stored in ECX register */
Avi Kivity72952612011-04-20 13:12:27 +0300268#define __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, _suffix, _type) \
269 do { \
270 unsigned long _tmp; \
271 _type _clv = (_cl).val; \
272 _type _srcv = (_src).val; \
273 _type _dstv = (_dst).val; \
274 \
275 __asm__ __volatile__ ( \
276 _PRE_EFLAGS("0", "5", "2") \
277 _op _suffix " %4,%1 \n" \
278 _POST_EFLAGS("0", "5", "2") \
279 : "=m" (_eflags), "+r" (_dstv), "=&r" (_tmp) \
280 : "c" (_clv) , "r" (_srcv), "i" (EFLAGS_MASK) \
281 ); \
282 \
283 (_cl).val = (unsigned long) _clv; \
284 (_src).val = (unsigned long) _srcv; \
285 (_dst).val = (unsigned long) _dstv; \
Guillaume Thouvenind1752262008-12-04 14:29:00 +0100286 } while (0)
287
Avi Kivity72952612011-04-20 13:12:27 +0300288#define emulate_2op_cl(_op, _cl, _src, _dst, _eflags) \
289 do { \
290 switch ((_dst).bytes) { \
291 case 2: \
292 __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \
293 "w", unsigned short); \
294 break; \
295 case 4: \
296 __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \
297 "l", unsigned int); \
298 break; \
299 case 8: \
300 ON64(__emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \
301 "q", unsigned long)); \
302 break; \
303 } \
Guillaume Thouvenind1752262008-12-04 14:29:00 +0100304 } while (0)
305
Avi Kivitydda96d82008-11-26 15:14:10 +0200306#define __emulate_1op(_op, _dst, _eflags, _suffix) \
Avi Kivity6aa8b732006-12-10 02:21:36 -0800307 do { \
308 unsigned long _tmp; \
309 \
Avi Kivitydda96d82008-11-26 15:14:10 +0200310 __asm__ __volatile__ ( \
311 _PRE_EFLAGS("0", "3", "2") \
312 _op _suffix " %1; " \
313 _POST_EFLAGS("0", "3", "2") \
314 : "=m" (_eflags), "+m" ((_dst).val), \
315 "=&r" (_tmp) \
316 : "i" (EFLAGS_MASK)); \
317 } while (0)
318
319/* Instruction has only one explicit operand (no source operand). */
320#define emulate_1op(_op, _dst, _eflags) \
321 do { \
Mike Dayd77c26f2007-10-08 09:02:08 -0400322 switch ((_dst).bytes) { \
Avi Kivitydda96d82008-11-26 15:14:10 +0200323 case 1: __emulate_1op(_op, _dst, _eflags, "b"); break; \
324 case 2: __emulate_1op(_op, _dst, _eflags, "w"); break; \
325 case 4: __emulate_1op(_op, _dst, _eflags, "l"); break; \
326 case 8: ON64(__emulate_1op(_op, _dst, _eflags, "q")); break; \
Avi Kivity6aa8b732006-12-10 02:21:36 -0800327 } \
328 } while (0)
329
Mohammed Gamal3f9f53b2010-08-08 21:11:37 +0300330#define __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, _suffix) \
331 do { \
332 unsigned long _tmp; \
333 \
334 __asm__ __volatile__ ( \
335 _PRE_EFLAGS("0", "4", "1") \
336 _op _suffix " %5; " \
337 _POST_EFLAGS("0", "4", "1") \
338 : "=m" (_eflags), "=&r" (_tmp), \
339 "+a" (_rax), "+d" (_rdx) \
340 : "i" (EFLAGS_MASK), "m" ((_src).val), \
341 "a" (_rax), "d" (_rdx)); \
342 } while (0)
343
Avi Kivityf6b35972010-08-26 11:59:00 +0300344#define __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, _eflags, _suffix, _ex) \
345 do { \
346 unsigned long _tmp; \
347 \
348 __asm__ __volatile__ ( \
349 _PRE_EFLAGS("0", "5", "1") \
350 "1: \n\t" \
351 _op _suffix " %6; " \
352 "2: \n\t" \
353 _POST_EFLAGS("0", "5", "1") \
354 ".pushsection .fixup,\"ax\" \n\t" \
355 "3: movb $1, %4 \n\t" \
356 "jmp 2b \n\t" \
357 ".popsection \n\t" \
358 _ASM_EXTABLE(1b, 3b) \
359 : "=m" (_eflags), "=&r" (_tmp), \
360 "+a" (_rax), "+d" (_rdx), "+qm"(_ex) \
361 : "i" (EFLAGS_MASK), "m" ((_src).val), \
362 "a" (_rax), "d" (_rdx)); \
363 } while (0)
364
Mohammed Gamal3f9f53b2010-08-08 21:11:37 +0300365/* instruction has only one source operand, destination is implicit (e.g. mul, div, imul, idiv) */
Avi Kivity72952612011-04-20 13:12:27 +0300366#define emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags) \
367 do { \
368 switch((_src).bytes) { \
369 case 1: \
370 __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, \
371 _eflags, "b"); \
372 break; \
373 case 2: \
374 __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, \
375 _eflags, "w"); \
376 break; \
377 case 4: \
378 __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, \
379 _eflags, "l"); \
380 break; \
381 case 8: \
382 ON64(__emulate_1op_rax_rdx(_op, _src, _rax, _rdx, \
383 _eflags, "q")); \
384 break; \
Mohammed Gamal3f9f53b2010-08-08 21:11:37 +0300385 } \
386 } while (0)
387
Avi Kivityf6b35972010-08-26 11:59:00 +0300388#define emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, _eflags, _ex) \
389 do { \
390 switch((_src).bytes) { \
391 case 1: \
392 __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
393 _eflags, "b", _ex); \
394 break; \
395 case 2: \
396 __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
397 _eflags, "w", _ex); \
398 break; \
399 case 4: \
400 __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
401 _eflags, "l", _ex); \
402 break; \
403 case 8: ON64( \
404 __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
405 _eflags, "q", _ex)); \
406 break; \
407 } \
408 } while (0)
409
Avi Kivity6aa8b732006-12-10 02:21:36 -0800410/* Fetch next part of the instruction being emulated. */
411#define insn_fetch(_type, _size, _eip) \
412({ unsigned long _x; \
Avi Kivity62266862007-11-20 13:15:52 +0200413 rc = do_insn_fetch(ctxt, ops, (_eip), &_x, (_size)); \
Gleb Natapovaf5b4f72010-03-15 16:38:30 +0200414 if (rc != X86EMUL_CONTINUE) \
Avi Kivity6aa8b732006-12-10 02:21:36 -0800415 goto done; \
416 (_eip) += (_size); \
417 (_type)_x; \
418})
419
Avi Kivity72952612011-04-20 13:12:27 +0300420#define insn_fetch_arr(_arr, _size, _eip) \
Gleb Natapov414e6272010-04-28 19:15:26 +0300421({ rc = do_insn_fetch(ctxt, ops, (_eip), _arr, (_size)); \
422 if (rc != X86EMUL_CONTINUE) \
423 goto done; \
424 (_eip) += (_size); \
425})
426
Joerg Roedel8a76d7f2011-04-04 12:39:27 +0200427static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt,
428 enum x86_intercept intercept,
429 enum x86_intercept_stage stage)
430{
431 struct x86_instruction_info info = {
432 .intercept = intercept,
433 .rep_prefix = ctxt->decode.rep_prefix,
434 .modrm_mod = ctxt->decode.modrm_mod,
435 .modrm_reg = ctxt->decode.modrm_reg,
436 .modrm_rm = ctxt->decode.modrm_rm,
437 .src_val = ctxt->decode.src.val64,
438 .src_bytes = ctxt->decode.src.bytes,
439 .dst_bytes = ctxt->decode.dst.bytes,
440 .ad_bytes = ctxt->decode.ad_bytes,
441 .next_rip = ctxt->eip,
442 };
443
Avi Kivity29535382011-04-20 13:37:53 +0300444 return ctxt->ops->intercept(ctxt, &info, stage);
Joerg Roedel8a76d7f2011-04-04 12:39:27 +0200445}
446
Harvey Harrisonddcb2882008-02-18 11:12:48 -0800447static inline unsigned long ad_mask(struct decode_cache *c)
448{
449 return (1UL << (c->ad_bytes << 3)) - 1;
450}
451
Avi Kivity6aa8b732006-12-10 02:21:36 -0800452/* Access/update address held in a register, based on addressing mode. */
Harvey Harrisone4706772008-02-19 07:40:38 -0800453static inline unsigned long
454address_mask(struct decode_cache *c, unsigned long reg)
455{
456 if (c->ad_bytes == sizeof(unsigned long))
457 return reg;
458 else
459 return reg & ad_mask(c);
460}
461
462static inline unsigned long
Avi Kivity90de84f2010-11-17 15:28:21 +0200463register_address(struct decode_cache *c, unsigned long reg)
Harvey Harrisone4706772008-02-19 07:40:38 -0800464{
Avi Kivity90de84f2010-11-17 15:28:21 +0200465 return address_mask(c, reg);
Harvey Harrisone4706772008-02-19 07:40:38 -0800466}
467
Harvey Harrison7a9572752008-02-19 07:40:41 -0800468static inline void
469register_address_increment(struct decode_cache *c, unsigned long *reg, int inc)
470{
471 if (c->ad_bytes == sizeof(unsigned long))
472 *reg += inc;
473 else
474 *reg = (*reg & ~ad_mask(c)) | ((*reg + inc) & ad_mask(c));
475}
Avi Kivity6aa8b732006-12-10 02:21:36 -0800476
Harvey Harrison7a9572752008-02-19 07:40:41 -0800477static inline void jmp_rel(struct decode_cache *c, int rel)
478{
479 register_address_increment(c, &c->eip, rel);
480}
Nitin A Kamble098c9372007-08-19 11:00:36 +0300481
Avi Kivity56697682011-04-03 14:08:51 +0300482static u32 desc_limit_scaled(struct desc_struct *desc)
483{
484 u32 limit = get_desc_limit(desc);
485
486 return desc->g ? (limit << 12) | 0xfff : limit;
487}
488
Avi Kivity7a5b56d2008-06-22 16:22:51 +0300489static void set_seg_override(struct decode_cache *c, int seg)
490{
491 c->has_seg_override = true;
492 c->seg_override = seg;
493}
494
Gleb Natapov79168fd2010-04-28 19:15:30 +0300495static unsigned long seg_base(struct x86_emulate_ctxt *ctxt,
496 struct x86_emulate_ops *ops, int seg)
Avi Kivity7a5b56d2008-06-22 16:22:51 +0300497{
498 if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS)
499 return 0;
500
Avi Kivity4bff1e862011-04-20 13:37:53 +0300501 return ops->get_cached_segment_base(ctxt, seg);
Avi Kivity7a5b56d2008-06-22 16:22:51 +0300502}
503
Avi Kivity90de84f2010-11-17 15:28:21 +0200504static unsigned seg_override(struct x86_emulate_ctxt *ctxt,
Avi Kivity90de84f2010-11-17 15:28:21 +0200505 struct decode_cache *c)
Avi Kivity7a5b56d2008-06-22 16:22:51 +0300506{
507 if (!c->has_seg_override)
508 return 0;
509
Avi Kivity90de84f2010-11-17 15:28:21 +0200510 return c->seg_override;
Avi Kivity7a5b56d2008-06-22 16:22:51 +0300511}
512
Avi Kivity35d3d4a2010-11-22 17:53:25 +0200513static int emulate_exception(struct x86_emulate_ctxt *ctxt, int vec,
514 u32 error, bool valid)
Gleb Natapov54b84862010-04-28 19:15:44 +0300515{
Avi Kivityda9cb572010-11-22 17:53:21 +0200516 ctxt->exception.vector = vec;
517 ctxt->exception.error_code = error;
518 ctxt->exception.error_code_valid = valid;
Avi Kivity35d3d4a2010-11-22 17:53:25 +0200519 return X86EMUL_PROPAGATE_FAULT;
Gleb Natapov54b84862010-04-28 19:15:44 +0300520}
521
Joerg Roedel3b88e412011-04-04 12:39:29 +0200522static int emulate_db(struct x86_emulate_ctxt *ctxt)
523{
524 return emulate_exception(ctxt, DB_VECTOR, 0, false);
525}
526
Avi Kivity35d3d4a2010-11-22 17:53:25 +0200527static int emulate_gp(struct x86_emulate_ctxt *ctxt, int err)
Gleb Natapov54b84862010-04-28 19:15:44 +0300528{
Avi Kivity35d3d4a2010-11-22 17:53:25 +0200529 return emulate_exception(ctxt, GP_VECTOR, err, true);
Gleb Natapov54b84862010-04-28 19:15:44 +0300530}
531
Avi Kivity618ff152011-04-03 12:32:09 +0300532static int emulate_ss(struct x86_emulate_ctxt *ctxt, int err)
533{
534 return emulate_exception(ctxt, SS_VECTOR, err, true);
535}
536
Avi Kivity35d3d4a2010-11-22 17:53:25 +0200537static int emulate_ud(struct x86_emulate_ctxt *ctxt)
Gleb Natapov54b84862010-04-28 19:15:44 +0300538{
Avi Kivity35d3d4a2010-11-22 17:53:25 +0200539 return emulate_exception(ctxt, UD_VECTOR, 0, false);
Gleb Natapov54b84862010-04-28 19:15:44 +0300540}
541
Avi Kivity35d3d4a2010-11-22 17:53:25 +0200542static int emulate_ts(struct x86_emulate_ctxt *ctxt, int err)
Gleb Natapov54b84862010-04-28 19:15:44 +0300543{
Avi Kivity35d3d4a2010-11-22 17:53:25 +0200544 return emulate_exception(ctxt, TS_VECTOR, err, true);
Gleb Natapov54b84862010-04-28 19:15:44 +0300545}
546
Avi Kivity34d1f492010-08-26 11:59:01 +0300547static int emulate_de(struct x86_emulate_ctxt *ctxt)
548{
Avi Kivity35d3d4a2010-11-22 17:53:25 +0200549 return emulate_exception(ctxt, DE_VECTOR, 0, false);
Avi Kivity34d1f492010-08-26 11:59:01 +0300550}
551
Avi Kivity12537912011-03-29 11:41:27 +0200552static int emulate_nm(struct x86_emulate_ctxt *ctxt)
553{
554 return emulate_exception(ctxt, NM_VECTOR, 0, false);
555}
556
Avi Kivity1aa36612011-04-27 13:20:30 +0300557static u16 get_segment_selector(struct x86_emulate_ctxt *ctxt, unsigned seg)
558{
559 u16 selector;
560 struct desc_struct desc;
561
562 ctxt->ops->get_segment(ctxt, &selector, &desc, NULL, seg);
563 return selector;
564}
565
566static void set_segment_selector(struct x86_emulate_ctxt *ctxt, u16 selector,
567 unsigned seg)
568{
569 u16 dummy;
570 u32 base3;
571 struct desc_struct desc;
572
573 ctxt->ops->get_segment(ctxt, &dummy, &desc, &base3, seg);
574 ctxt->ops->set_segment(ctxt, selector, &desc, base3, seg);
575}
576
Nelson Elhage3d9b9382011-04-18 12:05:53 -0400577static int __linearize(struct x86_emulate_ctxt *ctxt,
Avi Kivity52fd8b42011-04-03 12:33:12 +0300578 struct segmented_address addr,
Nelson Elhage3d9b9382011-04-18 12:05:53 -0400579 unsigned size, bool write, bool fetch,
Avi Kivity52fd8b42011-04-03 12:33:12 +0300580 ulong *linear)
581{
582 struct decode_cache *c = &ctxt->decode;
Avi Kivity618ff152011-04-03 12:32:09 +0300583 struct desc_struct desc;
584 bool usable;
Avi Kivity52fd8b42011-04-03 12:33:12 +0300585 ulong la;
Avi Kivity618ff152011-04-03 12:32:09 +0300586 u32 lim;
Avi Kivity1aa36612011-04-27 13:20:30 +0300587 u16 sel;
Avi Kivity618ff152011-04-03 12:32:09 +0300588 unsigned cpl, rpl;
Avi Kivity52fd8b42011-04-03 12:33:12 +0300589
590 la = seg_base(ctxt, ctxt->ops, addr.seg) + addr.ea;
Avi Kivity618ff152011-04-03 12:32:09 +0300591 switch (ctxt->mode) {
592 case X86EMUL_MODE_REAL:
593 break;
594 case X86EMUL_MODE_PROT64:
595 if (((signed long)la << 16) >> 16 != la)
596 return emulate_gp(ctxt, 0);
597 break;
598 default:
Avi Kivity1aa36612011-04-27 13:20:30 +0300599 usable = ctxt->ops->get_segment(ctxt, &sel, &desc, NULL,
600 addr.seg);
Avi Kivity618ff152011-04-03 12:32:09 +0300601 if (!usable)
602 goto bad;
603 /* code segment or read-only data segment */
604 if (((desc.type & 8) || !(desc.type & 2)) && write)
605 goto bad;
606 /* unreadable code segment */
Nelson Elhage3d9b9382011-04-18 12:05:53 -0400607 if (!fetch && (desc.type & 8) && !(desc.type & 2))
Avi Kivity618ff152011-04-03 12:32:09 +0300608 goto bad;
609 lim = desc_limit_scaled(&desc);
610 if ((desc.type & 8) || !(desc.type & 4)) {
611 /* expand-up segment */
612 if (addr.ea > lim || (u32)(addr.ea + size - 1) > lim)
613 goto bad;
614 } else {
615 /* exapand-down segment */
616 if (addr.ea <= lim || (u32)(addr.ea + size - 1) <= lim)
617 goto bad;
618 lim = desc.d ? 0xffffffff : 0xffff;
619 if (addr.ea > lim || (u32)(addr.ea + size - 1) > lim)
620 goto bad;
621 }
Avi Kivity717746e2011-04-20 13:37:53 +0300622 cpl = ctxt->ops->cpl(ctxt);
Avi Kivity1aa36612011-04-27 13:20:30 +0300623 rpl = sel & 3;
Avi Kivity618ff152011-04-03 12:32:09 +0300624 cpl = max(cpl, rpl);
625 if (!(desc.type & 8)) {
626 /* data segment */
627 if (cpl > desc.dpl)
628 goto bad;
629 } else if ((desc.type & 8) && !(desc.type & 4)) {
630 /* nonconforming code segment */
631 if (cpl != desc.dpl)
632 goto bad;
633 } else if ((desc.type & 8) && (desc.type & 4)) {
634 /* conforming code segment */
635 if (cpl < desc.dpl)
636 goto bad;
637 }
638 break;
639 }
Nelson Elhage3d9b9382011-04-18 12:05:53 -0400640 if (fetch ? ctxt->mode != X86EMUL_MODE_PROT64 : c->ad_bytes != 8)
Avi Kivity52fd8b42011-04-03 12:33:12 +0300641 la &= (u32)-1;
642 *linear = la;
643 return X86EMUL_CONTINUE;
Avi Kivity618ff152011-04-03 12:32:09 +0300644bad:
645 if (addr.seg == VCPU_SREG_SS)
646 return emulate_ss(ctxt, addr.seg);
647 else
648 return emulate_gp(ctxt, addr.seg);
Avi Kivity52fd8b42011-04-03 12:33:12 +0300649}
650
Nelson Elhage3d9b9382011-04-18 12:05:53 -0400651static int linearize(struct x86_emulate_ctxt *ctxt,
652 struct segmented_address addr,
653 unsigned size, bool write,
654 ulong *linear)
655{
656 return __linearize(ctxt, addr, size, write, false, linear);
657}
658
659
Avi Kivity3ca3ac42011-03-31 16:52:26 +0200660static int segmented_read_std(struct x86_emulate_ctxt *ctxt,
661 struct segmented_address addr,
662 void *data,
663 unsigned size)
664{
Avi Kivity9fa088f2011-03-31 18:54:30 +0200665 int rc;
666 ulong linear;
667
Avi Kivity83b87952011-04-03 11:31:19 +0300668 rc = linearize(ctxt, addr, size, false, &linear);
Avi Kivity9fa088f2011-03-31 18:54:30 +0200669 if (rc != X86EMUL_CONTINUE)
670 return rc;
Avi Kivity0f65dd72011-04-20 13:37:53 +0300671 return ctxt->ops->read_std(ctxt, linear, data, size, &ctxt->exception);
Avi Kivity3ca3ac42011-03-31 16:52:26 +0200672}
673
Avi Kivity62266862007-11-20 13:15:52 +0200674static int do_fetch_insn_byte(struct x86_emulate_ctxt *ctxt,
675 struct x86_emulate_ops *ops,
Avi Kivity2fb53ad2010-04-11 13:05:15 +0300676 unsigned long eip, u8 *dest)
Avi Kivity62266862007-11-20 13:15:52 +0200677{
678 struct fetch_cache *fc = &ctxt->decode.fetch;
679 int rc;
Avi Kivity2fb53ad2010-04-11 13:05:15 +0300680 int size, cur_size;
Avi Kivity62266862007-11-20 13:15:52 +0200681
Avi Kivity2fb53ad2010-04-11 13:05:15 +0300682 if (eip == fc->end) {
Nelson Elhage3d9b9382011-04-18 12:05:53 -0400683 unsigned long linear;
684 struct segmented_address addr = { .seg=VCPU_SREG_CS, .ea=eip};
Avi Kivity2fb53ad2010-04-11 13:05:15 +0300685 cur_size = fc->end - fc->start;
686 size = min(15UL - cur_size, PAGE_SIZE - offset_in_page(eip));
Nelson Elhage3d9b9382011-04-18 12:05:53 -0400687 rc = __linearize(ctxt, addr, size, false, true, &linear);
688 if (rc != X86EMUL_CONTINUE)
689 return rc;
Avi Kivity0f65dd72011-04-20 13:37:53 +0300690 rc = ops->fetch(ctxt, linear, fc->data + cur_size,
691 size, &ctxt->exception);
Takuya Yoshikawa3e2815e2010-02-12 15:53:59 +0900692 if (rc != X86EMUL_CONTINUE)
Avi Kivity62266862007-11-20 13:15:52 +0200693 return rc;
Avi Kivity2fb53ad2010-04-11 13:05:15 +0300694 fc->end += size;
Avi Kivity62266862007-11-20 13:15:52 +0200695 }
Avi Kivity2fb53ad2010-04-11 13:05:15 +0300696 *dest = fc->data[eip - fc->start];
Takuya Yoshikawa3e2815e2010-02-12 15:53:59 +0900697 return X86EMUL_CONTINUE;
Avi Kivity62266862007-11-20 13:15:52 +0200698}
699
700static int do_insn_fetch(struct x86_emulate_ctxt *ctxt,
701 struct x86_emulate_ops *ops,
702 unsigned long eip, void *dest, unsigned size)
703{
Takuya Yoshikawa3e2815e2010-02-12 15:53:59 +0900704 int rc;
Avi Kivity62266862007-11-20 13:15:52 +0200705
Avi Kivityeb3c79e2009-11-24 15:20:15 +0200706 /* x86 instructions are limited to 15 bytes. */
Gleb Natapov063db062010-03-18 15:20:06 +0200707 if (eip + size - ctxt->eip > 15)
Avi Kivityeb3c79e2009-11-24 15:20:15 +0200708 return X86EMUL_UNHANDLEABLE;
Avi Kivity62266862007-11-20 13:15:52 +0200709 while (size--) {
710 rc = do_fetch_insn_byte(ctxt, ops, eip++, dest++);
Takuya Yoshikawa3e2815e2010-02-12 15:53:59 +0900711 if (rc != X86EMUL_CONTINUE)
Avi Kivity62266862007-11-20 13:15:52 +0200712 return rc;
713 }
Takuya Yoshikawa3e2815e2010-02-12 15:53:59 +0900714 return X86EMUL_CONTINUE;
Avi Kivity62266862007-11-20 13:15:52 +0200715}
716
Rusty Russell1e3c5cb2007-07-17 23:16:11 +1000717/*
718 * Given the 'reg' portion of a ModRM byte, and a register block, return a
719 * pointer into the block that addresses the relevant register.
720 * @highbyte_regs specifies whether to decode AH,CH,DH,BH.
721 */
722static void *decode_register(u8 modrm_reg, unsigned long *regs,
723 int highbyte_regs)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800724{
725 void *p;
726
727 p = &regs[modrm_reg];
728 if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8)
729 p = (unsigned char *)&regs[modrm_reg & 3] + 1;
730 return p;
731}
732
733static int read_descriptor(struct x86_emulate_ctxt *ctxt,
Avi Kivity90de84f2010-11-17 15:28:21 +0200734 struct segmented_address addr,
Avi Kivity6aa8b732006-12-10 02:21:36 -0800735 u16 *size, unsigned long *address, int op_bytes)
736{
737 int rc;
738
739 if (op_bytes == 2)
740 op_bytes = 3;
741 *address = 0;
Avi Kivity3ca3ac42011-03-31 16:52:26 +0200742 rc = segmented_read_std(ctxt, addr, size, 2);
Takuya Yoshikawa1b30eaa2010-02-12 15:57:56 +0900743 if (rc != X86EMUL_CONTINUE)
Avi Kivity6aa8b732006-12-10 02:21:36 -0800744 return rc;
Avi Kivity30b31ab2010-11-17 15:28:22 +0200745 addr.ea += 2;
Avi Kivity3ca3ac42011-03-31 16:52:26 +0200746 rc = segmented_read_std(ctxt, addr, address, op_bytes);
Avi Kivity6aa8b732006-12-10 02:21:36 -0800747 return rc;
748}
749
Nitin A Kamblebbe9abb2007-09-15 10:23:07 +0300750static int test_cc(unsigned int condition, unsigned int flags)
751{
752 int rc = 0;
753
754 switch ((condition & 15) >> 1) {
755 case 0: /* o */
756 rc |= (flags & EFLG_OF);
757 break;
758 case 1: /* b/c/nae */
759 rc |= (flags & EFLG_CF);
760 break;
761 case 2: /* z/e */
762 rc |= (flags & EFLG_ZF);
763 break;
764 case 3: /* be/na */
765 rc |= (flags & (EFLG_CF|EFLG_ZF));
766 break;
767 case 4: /* s */
768 rc |= (flags & EFLG_SF);
769 break;
770 case 5: /* p/pe */
771 rc |= (flags & EFLG_PF);
772 break;
773 case 7: /* le/ng */
774 rc |= (flags & EFLG_ZF);
775 /* fall through */
776 case 6: /* l/nge */
777 rc |= (!(flags & EFLG_SF) != !(flags & EFLG_OF));
778 break;
779 }
780
781 /* Odd condition identifiers (lsb == 1) have inverted sense. */
782 return (!!rc ^ (condition & 1));
783}
784
Avi Kivity91ff3cb2010-08-01 12:53:09 +0300785static void fetch_register_operand(struct operand *op)
786{
787 switch (op->bytes) {
788 case 1:
789 op->val = *(u8 *)op->addr.reg;
790 break;
791 case 2:
792 op->val = *(u16 *)op->addr.reg;
793 break;
794 case 4:
795 op->val = *(u32 *)op->addr.reg;
796 break;
797 case 8:
798 op->val = *(u64 *)op->addr.reg;
799 break;
800 }
801}
802
Avi Kivity12537912011-03-29 11:41:27 +0200803static void read_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, int reg)
804{
805 ctxt->ops->get_fpu(ctxt);
806 switch (reg) {
807 case 0: asm("movdqu %%xmm0, %0" : "=m"(*data)); break;
808 case 1: asm("movdqu %%xmm1, %0" : "=m"(*data)); break;
809 case 2: asm("movdqu %%xmm2, %0" : "=m"(*data)); break;
810 case 3: asm("movdqu %%xmm3, %0" : "=m"(*data)); break;
811 case 4: asm("movdqu %%xmm4, %0" : "=m"(*data)); break;
812 case 5: asm("movdqu %%xmm5, %0" : "=m"(*data)); break;
813 case 6: asm("movdqu %%xmm6, %0" : "=m"(*data)); break;
814 case 7: asm("movdqu %%xmm7, %0" : "=m"(*data)); break;
815#ifdef CONFIG_X86_64
816 case 8: asm("movdqu %%xmm8, %0" : "=m"(*data)); break;
817 case 9: asm("movdqu %%xmm9, %0" : "=m"(*data)); break;
818 case 10: asm("movdqu %%xmm10, %0" : "=m"(*data)); break;
819 case 11: asm("movdqu %%xmm11, %0" : "=m"(*data)); break;
820 case 12: asm("movdqu %%xmm12, %0" : "=m"(*data)); break;
821 case 13: asm("movdqu %%xmm13, %0" : "=m"(*data)); break;
822 case 14: asm("movdqu %%xmm14, %0" : "=m"(*data)); break;
823 case 15: asm("movdqu %%xmm15, %0" : "=m"(*data)); break;
824#endif
825 default: BUG();
826 }
827 ctxt->ops->put_fpu(ctxt);
828}
829
830static void write_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data,
831 int reg)
832{
833 ctxt->ops->get_fpu(ctxt);
834 switch (reg) {
835 case 0: asm("movdqu %0, %%xmm0" : : "m"(*data)); break;
836 case 1: asm("movdqu %0, %%xmm1" : : "m"(*data)); break;
837 case 2: asm("movdqu %0, %%xmm2" : : "m"(*data)); break;
838 case 3: asm("movdqu %0, %%xmm3" : : "m"(*data)); break;
839 case 4: asm("movdqu %0, %%xmm4" : : "m"(*data)); break;
840 case 5: asm("movdqu %0, %%xmm5" : : "m"(*data)); break;
841 case 6: asm("movdqu %0, %%xmm6" : : "m"(*data)); break;
842 case 7: asm("movdqu %0, %%xmm7" : : "m"(*data)); break;
843#ifdef CONFIG_X86_64
844 case 8: asm("movdqu %0, %%xmm8" : : "m"(*data)); break;
845 case 9: asm("movdqu %0, %%xmm9" : : "m"(*data)); break;
846 case 10: asm("movdqu %0, %%xmm10" : : "m"(*data)); break;
847 case 11: asm("movdqu %0, %%xmm11" : : "m"(*data)); break;
848 case 12: asm("movdqu %0, %%xmm12" : : "m"(*data)); break;
849 case 13: asm("movdqu %0, %%xmm13" : : "m"(*data)); break;
850 case 14: asm("movdqu %0, %%xmm14" : : "m"(*data)); break;
851 case 15: asm("movdqu %0, %%xmm15" : : "m"(*data)); break;
852#endif
853 default: BUG();
854 }
855 ctxt->ops->put_fpu(ctxt);
856}
857
858static void decode_register_operand(struct x86_emulate_ctxt *ctxt,
859 struct operand *op,
Avi Kivity3c118e22007-10-31 10:27:04 +0200860 struct decode_cache *c,
Avi Kivity3c118e22007-10-31 10:27:04 +0200861 int inhibit_bytereg)
862{
Avi Kivity33615aa2007-10-31 11:15:56 +0200863 unsigned reg = c->modrm_reg;
Avi Kivity9f1ef3f2007-10-31 11:21:06 +0200864 int highbyte_regs = c->rex_prefix == 0;
Avi Kivity33615aa2007-10-31 11:15:56 +0200865
866 if (!(c->d & ModRM))
867 reg = (c->b & 7) | ((c->rex_prefix & 1) << 3);
Avi Kivity12537912011-03-29 11:41:27 +0200868
869 if (c->d & Sse) {
870 op->type = OP_XMM;
871 op->bytes = 16;
872 op->addr.xmm = reg;
873 read_sse_reg(ctxt, &op->vec_val, reg);
874 return;
875 }
876
Avi Kivity3c118e22007-10-31 10:27:04 +0200877 op->type = OP_REG;
878 if ((c->d & ByteOp) && !inhibit_bytereg) {
Avi Kivity1a6440a2010-08-01 12:35:10 +0300879 op->addr.reg = decode_register(reg, c->regs, highbyte_regs);
Avi Kivity3c118e22007-10-31 10:27:04 +0200880 op->bytes = 1;
881 } else {
Avi Kivity1a6440a2010-08-01 12:35:10 +0300882 op->addr.reg = decode_register(reg, c->regs, 0);
Avi Kivity3c118e22007-10-31 10:27:04 +0200883 op->bytes = c->op_bytes;
Avi Kivity3c118e22007-10-31 10:27:04 +0200884 }
Avi Kivity91ff3cb2010-08-01 12:53:09 +0300885 fetch_register_operand(op);
Avi Kivity3c118e22007-10-31 10:27:04 +0200886 op->orig_val = op->val;
887}
888
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200889static int decode_modrm(struct x86_emulate_ctxt *ctxt,
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300890 struct x86_emulate_ops *ops,
891 struct operand *op)
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200892{
893 struct decode_cache *c = &ctxt->decode;
894 u8 sib;
Avi Kivityf5b4edc2008-06-15 22:09:11 -0700895 int index_reg = 0, base_reg = 0, scale;
Takuya Yoshikawa3e2815e2010-02-12 15:53:59 +0900896 int rc = X86EMUL_CONTINUE;
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300897 ulong modrm_ea = 0;
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200898
899 if (c->rex_prefix) {
900 c->modrm_reg = (c->rex_prefix & 4) << 1; /* REX.R */
901 index_reg = (c->rex_prefix & 2) << 2; /* REX.X */
902 c->modrm_rm = base_reg = (c->rex_prefix & 1) << 3; /* REG.B */
903 }
904
905 c->modrm = insn_fetch(u8, 1, c->eip);
906 c->modrm_mod |= (c->modrm & 0xc0) >> 6;
907 c->modrm_reg |= (c->modrm & 0x38) >> 3;
908 c->modrm_rm |= (c->modrm & 0x07);
Avi Kivity09ee57c2010-08-01 12:07:29 +0300909 c->modrm_seg = VCPU_SREG_DS;
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200910
911 if (c->modrm_mod == 3) {
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300912 op->type = OP_REG;
913 op->bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
914 op->addr.reg = decode_register(c->modrm_rm,
Avi Kivity107d6d22008-05-05 14:58:26 +0300915 c->regs, c->d & ByteOp);
Avi Kivity12537912011-03-29 11:41:27 +0200916 if (c->d & Sse) {
917 op->type = OP_XMM;
918 op->bytes = 16;
919 op->addr.xmm = c->modrm_rm;
920 read_sse_reg(ctxt, &op->vec_val, c->modrm_rm);
921 return rc;
922 }
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300923 fetch_register_operand(op);
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200924 return rc;
925 }
926
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300927 op->type = OP_MEM;
928
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200929 if (c->ad_bytes == 2) {
930 unsigned bx = c->regs[VCPU_REGS_RBX];
931 unsigned bp = c->regs[VCPU_REGS_RBP];
932 unsigned si = c->regs[VCPU_REGS_RSI];
933 unsigned di = c->regs[VCPU_REGS_RDI];
934
935 /* 16-bit ModR/M decode. */
936 switch (c->modrm_mod) {
937 case 0:
938 if (c->modrm_rm == 6)
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300939 modrm_ea += insn_fetch(u16, 2, c->eip);
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200940 break;
941 case 1:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300942 modrm_ea += insn_fetch(s8, 1, c->eip);
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200943 break;
944 case 2:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300945 modrm_ea += insn_fetch(u16, 2, c->eip);
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200946 break;
947 }
948 switch (c->modrm_rm) {
949 case 0:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300950 modrm_ea += bx + si;
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200951 break;
952 case 1:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300953 modrm_ea += bx + di;
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200954 break;
955 case 2:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300956 modrm_ea += bp + si;
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200957 break;
958 case 3:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300959 modrm_ea += bp + di;
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200960 break;
961 case 4:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300962 modrm_ea += si;
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200963 break;
964 case 5:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300965 modrm_ea += di;
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200966 break;
967 case 6:
968 if (c->modrm_mod != 0)
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300969 modrm_ea += bp;
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200970 break;
971 case 7:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300972 modrm_ea += bx;
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200973 break;
974 }
975 if (c->modrm_rm == 2 || c->modrm_rm == 3 ||
976 (c->modrm_rm == 6 && c->modrm_mod != 0))
Avi Kivity09ee57c2010-08-01 12:07:29 +0300977 c->modrm_seg = VCPU_SREG_SS;
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300978 modrm_ea = (u16)modrm_ea;
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200979 } else {
980 /* 32/64-bit ModR/M decode. */
Avi Kivity84411d82008-06-15 21:53:26 -0700981 if ((c->modrm_rm & 7) == 4) {
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200982 sib = insn_fetch(u8, 1, c->eip);
983 index_reg |= (sib >> 3) & 7;
984 base_reg |= sib & 7;
985 scale = sib >> 6;
986
Avi Kivitydc71d0f2008-06-15 21:23:17 -0700987 if ((base_reg & 7) == 5 && c->modrm_mod == 0)
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300988 modrm_ea += insn_fetch(s32, 4, c->eip);
Avi Kivitydc71d0f2008-06-15 21:23:17 -0700989 else
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300990 modrm_ea += c->regs[base_reg];
Avi Kivitydc71d0f2008-06-15 21:23:17 -0700991 if (index_reg != 4)
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300992 modrm_ea += c->regs[index_reg] << scale;
Avi Kivity84411d82008-06-15 21:53:26 -0700993 } else if ((c->modrm_rm & 7) == 5 && c->modrm_mod == 0) {
994 if (ctxt->mode == X86EMUL_MODE_PROT64)
Avi Kivityf5b4edc2008-06-15 22:09:11 -0700995 c->rip_relative = 1;
Avi Kivity84411d82008-06-15 21:53:26 -0700996 } else
Avi Kivity2dbd0dd2010-08-01 15:40:19 +0300997 modrm_ea += c->regs[c->modrm_rm];
Avi Kivity1c73ef6652007-11-01 06:31:28 +0200998 switch (c->modrm_mod) {
999 case 0:
1000 if (c->modrm_rm == 5)
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03001001 modrm_ea += insn_fetch(s32, 4, c->eip);
Avi Kivity1c73ef6652007-11-01 06:31:28 +02001002 break;
1003 case 1:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03001004 modrm_ea += insn_fetch(s8, 1, c->eip);
Avi Kivity1c73ef6652007-11-01 06:31:28 +02001005 break;
1006 case 2:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03001007 modrm_ea += insn_fetch(s32, 4, c->eip);
Avi Kivity1c73ef6652007-11-01 06:31:28 +02001008 break;
1009 }
1010 }
Avi Kivity90de84f2010-11-17 15:28:21 +02001011 op->addr.mem.ea = modrm_ea;
Avi Kivity1c73ef6652007-11-01 06:31:28 +02001012done:
1013 return rc;
1014}
1015
1016static int decode_abs(struct x86_emulate_ctxt *ctxt,
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03001017 struct x86_emulate_ops *ops,
1018 struct operand *op)
Avi Kivity1c73ef6652007-11-01 06:31:28 +02001019{
1020 struct decode_cache *c = &ctxt->decode;
Takuya Yoshikawa3e2815e2010-02-12 15:53:59 +09001021 int rc = X86EMUL_CONTINUE;
Avi Kivity1c73ef6652007-11-01 06:31:28 +02001022
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03001023 op->type = OP_MEM;
Avi Kivity1c73ef6652007-11-01 06:31:28 +02001024 switch (c->ad_bytes) {
1025 case 2:
Avi Kivity90de84f2010-11-17 15:28:21 +02001026 op->addr.mem.ea = insn_fetch(u16, 2, c->eip);
Avi Kivity1c73ef6652007-11-01 06:31:28 +02001027 break;
1028 case 4:
Avi Kivity90de84f2010-11-17 15:28:21 +02001029 op->addr.mem.ea = insn_fetch(u32, 4, c->eip);
Avi Kivity1c73ef6652007-11-01 06:31:28 +02001030 break;
1031 case 8:
Avi Kivity90de84f2010-11-17 15:28:21 +02001032 op->addr.mem.ea = insn_fetch(u64, 8, c->eip);
Avi Kivity1c73ef6652007-11-01 06:31:28 +02001033 break;
1034 }
1035done:
1036 return rc;
1037}
1038
Wei Yongjun35c843c2010-08-09 11:34:56 +08001039static void fetch_bit_operand(struct decode_cache *c)
1040{
Sheng Yang7129eec2010-09-28 16:33:32 +08001041 long sv = 0, mask;
Wei Yongjun35c843c2010-08-09 11:34:56 +08001042
Wei Yongjun3885f182010-08-09 11:37:37 +08001043 if (c->dst.type == OP_MEM && c->src.type == OP_REG) {
Wei Yongjun35c843c2010-08-09 11:34:56 +08001044 mask = ~(c->dst.bytes * 8 - 1);
1045
1046 if (c->src.bytes == 2)
1047 sv = (s16)c->src.val & (s16)mask;
1048 else if (c->src.bytes == 4)
1049 sv = (s32)c->src.val & (s32)mask;
1050
Avi Kivity90de84f2010-11-17 15:28:21 +02001051 c->dst.addr.mem.ea += (sv >> 3);
Wei Yongjun35c843c2010-08-09 11:34:56 +08001052 }
Wei Yongjunba7ff2b2010-08-09 11:39:14 +08001053
1054 /* only subword offset */
1055 c->src.val &= (c->dst.bytes << 3) - 1;
Wei Yongjun35c843c2010-08-09 11:34:56 +08001056}
1057
Gleb Natapov9de41572010-04-28 19:15:22 +03001058static int read_emulated(struct x86_emulate_ctxt *ctxt,
1059 struct x86_emulate_ops *ops,
1060 unsigned long addr, void *dest, unsigned size)
1061{
1062 int rc;
1063 struct read_cache *mc = &ctxt->decode.mem_read;
1064
1065 while (size) {
1066 int n = min(size, 8u);
1067 size -= n;
1068 if (mc->pos < mc->end)
1069 goto read_cached;
1070
Avi Kivity0f65dd72011-04-20 13:37:53 +03001071 rc = ops->read_emulated(ctxt, addr, mc->data + mc->end, n,
1072 &ctxt->exception);
Gleb Natapov9de41572010-04-28 19:15:22 +03001073 if (rc != X86EMUL_CONTINUE)
1074 return rc;
1075 mc->end += n;
1076
1077 read_cached:
1078 memcpy(dest, mc->data + mc->pos, n);
1079 mc->pos += n;
1080 dest += n;
1081 addr += n;
1082 }
1083 return X86EMUL_CONTINUE;
1084}
1085
Avi Kivity3ca3ac42011-03-31 16:52:26 +02001086static int segmented_read(struct x86_emulate_ctxt *ctxt,
1087 struct segmented_address addr,
1088 void *data,
1089 unsigned size)
1090{
Avi Kivity9fa088f2011-03-31 18:54:30 +02001091 int rc;
1092 ulong linear;
1093
Avi Kivity83b87952011-04-03 11:31:19 +03001094 rc = linearize(ctxt, addr, size, false, &linear);
Avi Kivity9fa088f2011-03-31 18:54:30 +02001095 if (rc != X86EMUL_CONTINUE)
1096 return rc;
1097 return read_emulated(ctxt, ctxt->ops, linear, data, size);
Avi Kivity3ca3ac42011-03-31 16:52:26 +02001098}
1099
1100static int segmented_write(struct x86_emulate_ctxt *ctxt,
1101 struct segmented_address addr,
1102 const void *data,
1103 unsigned size)
1104{
Avi Kivity9fa088f2011-03-31 18:54:30 +02001105 int rc;
1106 ulong linear;
1107
Avi Kivity83b87952011-04-03 11:31:19 +03001108 rc = linearize(ctxt, addr, size, true, &linear);
Avi Kivity9fa088f2011-03-31 18:54:30 +02001109 if (rc != X86EMUL_CONTINUE)
1110 return rc;
Avi Kivity0f65dd72011-04-20 13:37:53 +03001111 return ctxt->ops->write_emulated(ctxt, linear, data, size,
1112 &ctxt->exception);
Avi Kivity3ca3ac42011-03-31 16:52:26 +02001113}
1114
1115static int segmented_cmpxchg(struct x86_emulate_ctxt *ctxt,
1116 struct segmented_address addr,
1117 const void *orig_data, const void *data,
1118 unsigned size)
1119{
Avi Kivity9fa088f2011-03-31 18:54:30 +02001120 int rc;
1121 ulong linear;
1122
Avi Kivity83b87952011-04-03 11:31:19 +03001123 rc = linearize(ctxt, addr, size, true, &linear);
Avi Kivity9fa088f2011-03-31 18:54:30 +02001124 if (rc != X86EMUL_CONTINUE)
1125 return rc;
Avi Kivity0f65dd72011-04-20 13:37:53 +03001126 return ctxt->ops->cmpxchg_emulated(ctxt, linear, orig_data, data,
1127 size, &ctxt->exception);
Avi Kivity3ca3ac42011-03-31 16:52:26 +02001128}
1129
Gleb Natapov7b262e92010-03-18 15:20:27 +02001130static int pio_in_emulated(struct x86_emulate_ctxt *ctxt,
1131 struct x86_emulate_ops *ops,
1132 unsigned int size, unsigned short port,
1133 void *dest)
1134{
1135 struct read_cache *rc = &ctxt->decode.io_read;
1136
1137 if (rc->pos == rc->end) { /* refill pio read ahead */
1138 struct decode_cache *c = &ctxt->decode;
1139 unsigned int in_page, n;
1140 unsigned int count = c->rep_prefix ?
1141 address_mask(c, c->regs[VCPU_REGS_RCX]) : 1;
1142 in_page = (ctxt->eflags & EFLG_DF) ?
1143 offset_in_page(c->regs[VCPU_REGS_RDI]) :
1144 PAGE_SIZE - offset_in_page(c->regs[VCPU_REGS_RDI]);
1145 n = min(min(in_page, (unsigned int)sizeof(rc->data)) / size,
1146 count);
1147 if (n == 0)
1148 n = 1;
1149 rc->pos = rc->end = 0;
Avi Kivityca1d4a92011-04-20 13:37:53 +03001150 if (!ops->pio_in_emulated(ctxt, size, port, rc->data, n))
Gleb Natapov7b262e92010-03-18 15:20:27 +02001151 return 0;
1152 rc->end = n * size;
1153 }
1154
1155 memcpy(dest, rc->data + rc->pos, size);
1156 rc->pos += size;
1157 return 1;
1158}
1159
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001160static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt,
1161 struct x86_emulate_ops *ops,
1162 u16 selector, struct desc_ptr *dt)
1163{
1164 if (selector & 1 << 2) {
1165 struct desc_struct desc;
Avi Kivity1aa36612011-04-27 13:20:30 +03001166 u16 sel;
1167
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001168 memset (dt, 0, sizeof *dt);
Avi Kivity1aa36612011-04-27 13:20:30 +03001169 if (!ops->get_segment(ctxt, &sel, &desc, NULL, VCPU_SREG_LDTR))
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001170 return;
1171
1172 dt->size = desc_limit_scaled(&desc); /* what if limit > 65535? */
1173 dt->address = get_desc_base(&desc);
1174 } else
Avi Kivity4bff1e862011-04-20 13:37:53 +03001175 ops->get_gdt(ctxt, dt);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001176}
1177
1178/* allowed just for 8 bytes segments */
1179static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt,
1180 struct x86_emulate_ops *ops,
1181 u16 selector, struct desc_struct *desc)
1182{
1183 struct desc_ptr dt;
1184 u16 index = selector >> 3;
1185 int ret;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001186 ulong addr;
1187
1188 get_descriptor_table_ptr(ctxt, ops, selector, &dt);
1189
Avi Kivity35d3d4a2010-11-22 17:53:25 +02001190 if (dt.size < index * 8 + 7)
1191 return emulate_gp(ctxt, selector & 0xfffc);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001192 addr = dt.address + index * 8;
Avi Kivity0f65dd72011-04-20 13:37:53 +03001193 ret = ops->read_std(ctxt, addr, desc, sizeof *desc, &ctxt->exception);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001194
1195 return ret;
1196}
1197
1198/* allowed just for 8 bytes segments */
1199static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt,
1200 struct x86_emulate_ops *ops,
1201 u16 selector, struct desc_struct *desc)
1202{
1203 struct desc_ptr dt;
1204 u16 index = selector >> 3;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001205 ulong addr;
1206 int ret;
1207
1208 get_descriptor_table_ptr(ctxt, ops, selector, &dt);
1209
Avi Kivity35d3d4a2010-11-22 17:53:25 +02001210 if (dt.size < index * 8 + 7)
1211 return emulate_gp(ctxt, selector & 0xfffc);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001212
1213 addr = dt.address + index * 8;
Avi Kivity0f65dd72011-04-20 13:37:53 +03001214 ret = ops->write_std(ctxt, addr, desc, sizeof *desc, &ctxt->exception);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001215
1216 return ret;
1217}
1218
Gleb Natapov5601d052011-03-07 14:55:06 +02001219/* Does not support long mode */
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001220static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
1221 struct x86_emulate_ops *ops,
1222 u16 selector, int seg)
1223{
1224 struct desc_struct seg_desc;
1225 u8 dpl, rpl, cpl;
1226 unsigned err_vec = GP_VECTOR;
1227 u32 err_code = 0;
1228 bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */
1229 int ret;
1230
1231 memset(&seg_desc, 0, sizeof seg_desc);
1232
1233 if ((seg <= VCPU_SREG_GS && ctxt->mode == X86EMUL_MODE_VM86)
1234 || ctxt->mode == X86EMUL_MODE_REAL) {
1235 /* set real mode segment descriptor */
1236 set_desc_base(&seg_desc, selector << 4);
1237 set_desc_limit(&seg_desc, 0xffff);
1238 seg_desc.type = 3;
1239 seg_desc.p = 1;
1240 seg_desc.s = 1;
1241 goto load;
1242 }
1243
1244 /* NULL selector is not valid for TR, CS and SS */
1245 if ((seg == VCPU_SREG_CS || seg == VCPU_SREG_SS || seg == VCPU_SREG_TR)
1246 && null_selector)
1247 goto exception;
1248
1249 /* TR should be in GDT only */
1250 if (seg == VCPU_SREG_TR && (selector & (1 << 2)))
1251 goto exception;
1252
1253 if (null_selector) /* for NULL selector skip all following checks */
1254 goto load;
1255
1256 ret = read_segment_descriptor(ctxt, ops, selector, &seg_desc);
1257 if (ret != X86EMUL_CONTINUE)
1258 return ret;
1259
1260 err_code = selector & 0xfffc;
1261 err_vec = GP_VECTOR;
1262
1263 /* can't load system descriptor into segment selecor */
1264 if (seg <= VCPU_SREG_GS && !seg_desc.s)
1265 goto exception;
1266
1267 if (!seg_desc.p) {
1268 err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR;
1269 goto exception;
1270 }
1271
1272 rpl = selector & 3;
1273 dpl = seg_desc.dpl;
Avi Kivity717746e2011-04-20 13:37:53 +03001274 cpl = ops->cpl(ctxt);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001275
1276 switch (seg) {
1277 case VCPU_SREG_SS:
1278 /*
1279 * segment is not a writable data segment or segment
1280 * selector's RPL != CPL or segment selector's RPL != CPL
1281 */
1282 if (rpl != cpl || (seg_desc.type & 0xa) != 0x2 || dpl != cpl)
1283 goto exception;
1284 break;
1285 case VCPU_SREG_CS:
1286 if (!(seg_desc.type & 8))
1287 goto exception;
1288
1289 if (seg_desc.type & 4) {
1290 /* conforming */
1291 if (dpl > cpl)
1292 goto exception;
1293 } else {
1294 /* nonconforming */
1295 if (rpl > cpl || dpl != cpl)
1296 goto exception;
1297 }
1298 /* CS(RPL) <- CPL */
1299 selector = (selector & 0xfffc) | cpl;
1300 break;
1301 case VCPU_SREG_TR:
1302 if (seg_desc.s || (seg_desc.type != 1 && seg_desc.type != 9))
1303 goto exception;
1304 break;
1305 case VCPU_SREG_LDTR:
1306 if (seg_desc.s || seg_desc.type != 2)
1307 goto exception;
1308 break;
1309 default: /* DS, ES, FS, or GS */
1310 /*
1311 * segment is not a data or readable code segment or
1312 * ((segment is a data or nonconforming code segment)
1313 * and (both RPL and CPL > DPL))
1314 */
1315 if ((seg_desc.type & 0xa) == 0x8 ||
1316 (((seg_desc.type & 0xc) != 0xc) &&
1317 (rpl > dpl && cpl > dpl)))
1318 goto exception;
1319 break;
1320 }
1321
1322 if (seg_desc.s) {
1323 /* mark segment as accessed */
1324 seg_desc.type |= 1;
1325 ret = write_segment_descriptor(ctxt, ops, selector, &seg_desc);
1326 if (ret != X86EMUL_CONTINUE)
1327 return ret;
1328 }
1329load:
Avi Kivity1aa36612011-04-27 13:20:30 +03001330 ops->set_segment(ctxt, selector, &seg_desc, 0, seg);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001331 return X86EMUL_CONTINUE;
1332exception:
Gleb Natapov54b84862010-04-28 19:15:44 +03001333 emulate_exception(ctxt, err_vec, err_code, true);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02001334 return X86EMUL_PROPAGATE_FAULT;
1335}
1336
Wei Yongjun31be40b2010-08-17 09:17:30 +08001337static void write_register_operand(struct operand *op)
1338{
1339 /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */
1340 switch (op->bytes) {
1341 case 1:
1342 *(u8 *)op->addr.reg = (u8)op->val;
1343 break;
1344 case 2:
1345 *(u16 *)op->addr.reg = (u16)op->val;
1346 break;
1347 case 4:
1348 *op->addr.reg = (u32)op->val;
1349 break; /* 64b: zero-extend */
1350 case 8:
1351 *op->addr.reg = op->val;
1352 break;
1353 }
1354}
1355
Takuya Yoshikawaadddcec2011-05-02 02:26:23 +09001356static int writeback(struct x86_emulate_ctxt *ctxt)
Wei Yongjunc37eda12010-06-15 09:03:33 +08001357{
1358 int rc;
1359 struct decode_cache *c = &ctxt->decode;
Wei Yongjunc37eda12010-06-15 09:03:33 +08001360
1361 switch (c->dst.type) {
1362 case OP_REG:
Wei Yongjun31be40b2010-08-17 09:17:30 +08001363 write_register_operand(&c->dst);
Wei Yongjunc37eda12010-06-15 09:03:33 +08001364 break;
1365 case OP_MEM:
1366 if (c->lock_prefix)
Avi Kivity3ca3ac42011-03-31 16:52:26 +02001367 rc = segmented_cmpxchg(ctxt,
1368 c->dst.addr.mem,
1369 &c->dst.orig_val,
1370 &c->dst.val,
1371 c->dst.bytes);
Wei Yongjunc37eda12010-06-15 09:03:33 +08001372 else
Avi Kivity3ca3ac42011-03-31 16:52:26 +02001373 rc = segmented_write(ctxt,
1374 c->dst.addr.mem,
1375 &c->dst.val,
1376 c->dst.bytes);
Wei Yongjunc37eda12010-06-15 09:03:33 +08001377 if (rc != X86EMUL_CONTINUE)
1378 return rc;
1379 break;
Avi Kivity12537912011-03-29 11:41:27 +02001380 case OP_XMM:
1381 write_sse_reg(ctxt, &c->dst.vec_val, c->dst.addr.xmm);
1382 break;
Wei Yongjunc37eda12010-06-15 09:03:33 +08001383 case OP_NONE:
1384 /* no writeback */
1385 break;
1386 default:
1387 break;
1388 }
1389 return X86EMUL_CONTINUE;
1390}
1391
Takuya Yoshikawa4487b3b2011-04-13 00:31:23 +09001392static int em_push(struct x86_emulate_ctxt *ctxt)
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001393{
1394 struct decode_cache *c = &ctxt->decode;
Takuya Yoshikawa4179bb02011-04-13 00:29:09 +09001395 struct segmented_address addr;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001396
Harvey Harrison7a9572752008-02-19 07:40:41 -08001397 register_address_increment(c, &c->regs[VCPU_REGS_RSP], -c->op_bytes);
Takuya Yoshikawa4179bb02011-04-13 00:29:09 +09001398 addr.ea = register_address(c, c->regs[VCPU_REGS_RSP]);
1399 addr.seg = VCPU_SREG_SS;
1400
1401 /* Disable writeback. */
1402 c->dst.type = OP_NONE;
1403 return segmented_write(ctxt, addr, &c->src.val, c->op_bytes);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001404}
1405
Avi Kivityfaa5a3a2008-11-27 17:36:41 +02001406static int emulate_pop(struct x86_emulate_ctxt *ctxt,
Avi Kivity350f69d2009-01-05 11:12:40 +02001407 void *dest, int len)
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001408{
1409 struct decode_cache *c = &ctxt->decode;
1410 int rc;
Avi Kivity90de84f2010-11-17 15:28:21 +02001411 struct segmented_address addr;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001412
Avi Kivity90de84f2010-11-17 15:28:21 +02001413 addr.ea = register_address(c, c->regs[VCPU_REGS_RSP]);
1414 addr.seg = VCPU_SREG_SS;
Avi Kivity3ca3ac42011-03-31 16:52:26 +02001415 rc = segmented_read(ctxt, addr, dest, len);
Takuya Yoshikawab60d5132010-01-20 16:47:21 +09001416 if (rc != X86EMUL_CONTINUE)
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001417 return rc;
1418
Avi Kivity350f69d2009-01-05 11:12:40 +02001419 register_address_increment(c, &c->regs[VCPU_REGS_RSP], len);
Avi Kivityfaa5a3a2008-11-27 17:36:41 +02001420 return rc;
1421}
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001422
Takuya Yoshikawac54fe502011-04-23 18:49:40 +09001423static int em_pop(struct x86_emulate_ctxt *ctxt)
1424{
1425 struct decode_cache *c = &ctxt->decode;
1426
Takuya Yoshikawa3b9be3b2011-05-02 02:27:55 +09001427 return emulate_pop(ctxt, &c->dst.val, c->op_bytes);
Takuya Yoshikawac54fe502011-04-23 18:49:40 +09001428}
1429
Gleb Natapovd4c6a152010-02-10 14:21:34 +02001430static int emulate_popf(struct x86_emulate_ctxt *ctxt,
1431 struct x86_emulate_ops *ops,
1432 void *dest, int len)
1433{
1434 int rc;
1435 unsigned long val, change_mask;
1436 int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
Avi Kivity717746e2011-04-20 13:37:53 +03001437 int cpl = ops->cpl(ctxt);
Gleb Natapovd4c6a152010-02-10 14:21:34 +02001438
Takuya Yoshikawa3b9be3b2011-05-02 02:27:55 +09001439 rc = emulate_pop(ctxt, &val, len);
Gleb Natapovd4c6a152010-02-10 14:21:34 +02001440 if (rc != X86EMUL_CONTINUE)
1441 return rc;
1442
1443 change_mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_OF
1444 | EFLG_TF | EFLG_DF | EFLG_NT | EFLG_RF | EFLG_AC | EFLG_ID;
1445
1446 switch(ctxt->mode) {
1447 case X86EMUL_MODE_PROT64:
1448 case X86EMUL_MODE_PROT32:
1449 case X86EMUL_MODE_PROT16:
1450 if (cpl == 0)
1451 change_mask |= EFLG_IOPL;
1452 if (cpl <= iopl)
1453 change_mask |= EFLG_IF;
1454 break;
1455 case X86EMUL_MODE_VM86:
Avi Kivity35d3d4a2010-11-22 17:53:25 +02001456 if (iopl < 3)
1457 return emulate_gp(ctxt, 0);
Gleb Natapovd4c6a152010-02-10 14:21:34 +02001458 change_mask |= EFLG_IF;
1459 break;
1460 default: /* real mode */
1461 change_mask |= (EFLG_IOPL | EFLG_IF);
1462 break;
1463 }
1464
1465 *(unsigned long *)dest =
1466 (ctxt->eflags & ~change_mask) | (val & change_mask);
1467
1468 return rc;
1469}
1470
Takuya Yoshikawa62aaa2f2011-04-23 18:52:56 +09001471static int em_popf(struct x86_emulate_ctxt *ctxt)
1472{
1473 struct decode_cache *c = &ctxt->decode;
1474
1475 c->dst.type = OP_REG;
1476 c->dst.addr.reg = &ctxt->eflags;
1477 c->dst.bytes = c->op_bytes;
1478 return emulate_popf(ctxt, ctxt->ops, &c->dst.val, c->op_bytes);
1479}
1480
Takuya Yoshikawa4179bb02011-04-13 00:29:09 +09001481static int emulate_push_sreg(struct x86_emulate_ctxt *ctxt,
1482 struct x86_emulate_ops *ops, int seg)
Mohammed Gamal0934ac92009-08-23 14:24:24 +03001483{
1484 struct decode_cache *c = &ctxt->decode;
Mohammed Gamal0934ac92009-08-23 14:24:24 +03001485
Avi Kivity1aa36612011-04-27 13:20:30 +03001486 c->src.val = get_segment_selector(ctxt, seg);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03001487
Takuya Yoshikawa4487b3b2011-04-13 00:31:23 +09001488 return em_push(ctxt);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03001489}
1490
1491static int emulate_pop_sreg(struct x86_emulate_ctxt *ctxt,
1492 struct x86_emulate_ops *ops, int seg)
1493{
1494 struct decode_cache *c = &ctxt->decode;
1495 unsigned long selector;
1496 int rc;
1497
Takuya Yoshikawa3b9be3b2011-05-02 02:27:55 +09001498 rc = emulate_pop(ctxt, &selector, c->op_bytes);
Takuya Yoshikawa1b30eaa2010-02-12 15:57:56 +09001499 if (rc != X86EMUL_CONTINUE)
Mohammed Gamal0934ac92009-08-23 14:24:24 +03001500 return rc;
1501
Gleb Natapov2e873022010-03-18 15:20:18 +02001502 rc = load_segment_descriptor(ctxt, ops, (u16)selector, seg);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03001503 return rc;
1504}
1505
Takuya Yoshikawab96a7fa2011-04-23 18:51:07 +09001506static int em_pusha(struct x86_emulate_ctxt *ctxt)
Mohammed Gamalabcf14b2009-09-01 15:28:11 +02001507{
1508 struct decode_cache *c = &ctxt->decode;
1509 unsigned long old_esp = c->regs[VCPU_REGS_RSP];
Wei Yongjunc37eda12010-06-15 09:03:33 +08001510 int rc = X86EMUL_CONTINUE;
Mohammed Gamalabcf14b2009-09-01 15:28:11 +02001511 int reg = VCPU_REGS_RAX;
1512
1513 while (reg <= VCPU_REGS_RDI) {
1514 (reg == VCPU_REGS_RSP) ?
1515 (c->src.val = old_esp) : (c->src.val = c->regs[reg]);
1516
Takuya Yoshikawa4487b3b2011-04-13 00:31:23 +09001517 rc = em_push(ctxt);
Wei Yongjunc37eda12010-06-15 09:03:33 +08001518 if (rc != X86EMUL_CONTINUE)
1519 return rc;
1520
Mohammed Gamalabcf14b2009-09-01 15:28:11 +02001521 ++reg;
1522 }
Wei Yongjunc37eda12010-06-15 09:03:33 +08001523
Wei Yongjunc37eda12010-06-15 09:03:33 +08001524 return rc;
Mohammed Gamalabcf14b2009-09-01 15:28:11 +02001525}
1526
Takuya Yoshikawa62aaa2f2011-04-23 18:52:56 +09001527static int em_pushf(struct x86_emulate_ctxt *ctxt)
1528{
1529 struct decode_cache *c = &ctxt->decode;
1530
1531 c->src.val = (unsigned long)ctxt->eflags;
1532 return em_push(ctxt);
1533}
1534
Takuya Yoshikawab96a7fa2011-04-23 18:51:07 +09001535static int em_popa(struct x86_emulate_ctxt *ctxt)
Mohammed Gamalabcf14b2009-09-01 15:28:11 +02001536{
1537 struct decode_cache *c = &ctxt->decode;
Takuya Yoshikawa1b30eaa2010-02-12 15:57:56 +09001538 int rc = X86EMUL_CONTINUE;
Mohammed Gamalabcf14b2009-09-01 15:28:11 +02001539 int reg = VCPU_REGS_RDI;
1540
1541 while (reg >= VCPU_REGS_RAX) {
1542 if (reg == VCPU_REGS_RSP) {
1543 register_address_increment(c, &c->regs[VCPU_REGS_RSP],
1544 c->op_bytes);
1545 --reg;
1546 }
1547
Takuya Yoshikawa3b9be3b2011-05-02 02:27:55 +09001548 rc = emulate_pop(ctxt, &c->regs[reg], c->op_bytes);
Takuya Yoshikawa1b30eaa2010-02-12 15:57:56 +09001549 if (rc != X86EMUL_CONTINUE)
Mohammed Gamalabcf14b2009-09-01 15:28:11 +02001550 break;
1551 --reg;
1552 }
1553 return rc;
1554}
1555
Mohammed Gamal6e154e52010-08-04 14:38:06 +03001556int emulate_int_real(struct x86_emulate_ctxt *ctxt,
1557 struct x86_emulate_ops *ops, int irq)
1558{
1559 struct decode_cache *c = &ctxt->decode;
Avi Kivity5c56e1c2010-08-17 11:17:51 +03001560 int rc;
Mohammed Gamal6e154e52010-08-04 14:38:06 +03001561 struct desc_ptr dt;
1562 gva_t cs_addr;
1563 gva_t eip_addr;
1564 u16 cs, eip;
Mohammed Gamal6e154e52010-08-04 14:38:06 +03001565
1566 /* TODO: Add limit checks */
1567 c->src.val = ctxt->eflags;
Takuya Yoshikawa4487b3b2011-04-13 00:31:23 +09001568 rc = em_push(ctxt);
Avi Kivity5c56e1c2010-08-17 11:17:51 +03001569 if (rc != X86EMUL_CONTINUE)
1570 return rc;
Mohammed Gamal6e154e52010-08-04 14:38:06 +03001571
1572 ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC);
1573
Avi Kivity1aa36612011-04-27 13:20:30 +03001574 c->src.val = get_segment_selector(ctxt, VCPU_SREG_CS);
Takuya Yoshikawa4487b3b2011-04-13 00:31:23 +09001575 rc = em_push(ctxt);
Avi Kivity5c56e1c2010-08-17 11:17:51 +03001576 if (rc != X86EMUL_CONTINUE)
1577 return rc;
Mohammed Gamal6e154e52010-08-04 14:38:06 +03001578
1579 c->src.val = c->eip;
Takuya Yoshikawa4487b3b2011-04-13 00:31:23 +09001580 rc = em_push(ctxt);
Avi Kivity5c56e1c2010-08-17 11:17:51 +03001581 if (rc != X86EMUL_CONTINUE)
1582 return rc;
1583
Avi Kivity4bff1e862011-04-20 13:37:53 +03001584 ops->get_idt(ctxt, &dt);
Mohammed Gamal6e154e52010-08-04 14:38:06 +03001585
1586 eip_addr = dt.address + (irq << 2);
1587 cs_addr = dt.address + (irq << 2) + 2;
1588
Avi Kivity0f65dd72011-04-20 13:37:53 +03001589 rc = ops->read_std(ctxt, cs_addr, &cs, 2, &ctxt->exception);
Mohammed Gamal6e154e52010-08-04 14:38:06 +03001590 if (rc != X86EMUL_CONTINUE)
1591 return rc;
1592
Avi Kivity0f65dd72011-04-20 13:37:53 +03001593 rc = ops->read_std(ctxt, eip_addr, &eip, 2, &ctxt->exception);
Mohammed Gamal6e154e52010-08-04 14:38:06 +03001594 if (rc != X86EMUL_CONTINUE)
1595 return rc;
1596
1597 rc = load_segment_descriptor(ctxt, ops, cs, VCPU_SREG_CS);
1598 if (rc != X86EMUL_CONTINUE)
1599 return rc;
1600
1601 c->eip = eip;
1602
1603 return rc;
1604}
1605
1606static int emulate_int(struct x86_emulate_ctxt *ctxt,
1607 struct x86_emulate_ops *ops, int irq)
1608{
1609 switch(ctxt->mode) {
1610 case X86EMUL_MODE_REAL:
1611 return emulate_int_real(ctxt, ops, irq);
1612 case X86EMUL_MODE_VM86:
1613 case X86EMUL_MODE_PROT16:
1614 case X86EMUL_MODE_PROT32:
1615 case X86EMUL_MODE_PROT64:
1616 default:
1617 /* Protected mode interrupts unimplemented yet */
1618 return X86EMUL_UNHANDLEABLE;
1619 }
1620}
1621
Mohammed Gamal62bd4302010-07-28 12:38:40 +03001622static int emulate_iret_real(struct x86_emulate_ctxt *ctxt,
1623 struct x86_emulate_ops *ops)
1624{
1625 struct decode_cache *c = &ctxt->decode;
1626 int rc = X86EMUL_CONTINUE;
1627 unsigned long temp_eip = 0;
1628 unsigned long temp_eflags = 0;
1629 unsigned long cs = 0;
1630 unsigned long mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_TF |
1631 EFLG_IF | EFLG_DF | EFLG_OF | EFLG_IOPL | EFLG_NT | EFLG_RF |
1632 EFLG_AC | EFLG_ID | (1 << 1); /* Last one is the reserved bit */
1633 unsigned long vm86_mask = EFLG_VM | EFLG_VIF | EFLG_VIP;
1634
1635 /* TODO: Add stack limit check */
1636
Takuya Yoshikawa3b9be3b2011-05-02 02:27:55 +09001637 rc = emulate_pop(ctxt, &temp_eip, c->op_bytes);
Mohammed Gamal62bd4302010-07-28 12:38:40 +03001638
1639 if (rc != X86EMUL_CONTINUE)
1640 return rc;
1641
Avi Kivity35d3d4a2010-11-22 17:53:25 +02001642 if (temp_eip & ~0xffff)
1643 return emulate_gp(ctxt, 0);
Mohammed Gamal62bd4302010-07-28 12:38:40 +03001644
Takuya Yoshikawa3b9be3b2011-05-02 02:27:55 +09001645 rc = emulate_pop(ctxt, &cs, c->op_bytes);
Mohammed Gamal62bd4302010-07-28 12:38:40 +03001646
1647 if (rc != X86EMUL_CONTINUE)
1648 return rc;
1649
Takuya Yoshikawa3b9be3b2011-05-02 02:27:55 +09001650 rc = emulate_pop(ctxt, &temp_eflags, c->op_bytes);
Mohammed Gamal62bd4302010-07-28 12:38:40 +03001651
1652 if (rc != X86EMUL_CONTINUE)
1653 return rc;
1654
1655 rc = load_segment_descriptor(ctxt, ops, (u16)cs, VCPU_SREG_CS);
1656
1657 if (rc != X86EMUL_CONTINUE)
1658 return rc;
1659
1660 c->eip = temp_eip;
1661
1662
1663 if (c->op_bytes == 4)
1664 ctxt->eflags = ((temp_eflags & mask) | (ctxt->eflags & vm86_mask));
1665 else if (c->op_bytes == 2) {
1666 ctxt->eflags &= ~0xffff;
1667 ctxt->eflags |= temp_eflags;
1668 }
1669
1670 ctxt->eflags &= ~EFLG_RESERVED_ZEROS_MASK; /* Clear reserved zeros */
1671 ctxt->eflags |= EFLG_RESERVED_ONE_MASK;
1672
1673 return rc;
1674}
1675
1676static inline int emulate_iret(struct x86_emulate_ctxt *ctxt,
1677 struct x86_emulate_ops* ops)
1678{
1679 switch(ctxt->mode) {
1680 case X86EMUL_MODE_REAL:
1681 return emulate_iret_real(ctxt, ops);
1682 case X86EMUL_MODE_VM86:
1683 case X86EMUL_MODE_PROT16:
1684 case X86EMUL_MODE_PROT32:
1685 case X86EMUL_MODE_PROT64:
1686 default:
1687 /* iret from protected mode unimplemented yet */
1688 return X86EMUL_UNHANDLEABLE;
1689 }
1690}
1691
Takuya Yoshikawad2f62762011-05-02 02:30:48 +09001692static int em_jmp_far(struct x86_emulate_ctxt *ctxt)
1693{
1694 struct decode_cache *c = &ctxt->decode;
1695 int rc;
1696 unsigned short sel;
1697
1698 memcpy(&sel, c->src.valptr + c->op_bytes, 2);
1699
1700 rc = load_segment_descriptor(ctxt, ctxt->ops, sel, VCPU_SREG_CS);
1701 if (rc != X86EMUL_CONTINUE)
1702 return rc;
1703
1704 c->eip = 0;
1705 memcpy(&c->eip, c->src.valptr, c->op_bytes);
1706 return X86EMUL_CONTINUE;
1707}
1708
Takuya Yoshikawa51187682011-05-02 02:29:17 +09001709static int em_grp1a(struct x86_emulate_ctxt *ctxt)
Avi Kivityfaa5a3a2008-11-27 17:36:41 +02001710{
1711 struct decode_cache *c = &ctxt->decode;
Avi Kivityfaa5a3a2008-11-27 17:36:41 +02001712
Takuya Yoshikawa3b9be3b2011-05-02 02:27:55 +09001713 return emulate_pop(ctxt, &c->dst.val, c->dst.bytes);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001714}
1715
Takuya Yoshikawa51187682011-05-02 02:29:17 +09001716static int em_grp2(struct x86_emulate_ctxt *ctxt)
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001717{
Laurent Vivier05f086f2007-09-24 11:10:55 +02001718 struct decode_cache *c = &ctxt->decode;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001719 switch (c->modrm_reg) {
1720 case 0: /* rol */
Laurent Vivier05f086f2007-09-24 11:10:55 +02001721 emulate_2op_SrcB("rol", c->src, c->dst, ctxt->eflags);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001722 break;
1723 case 1: /* ror */
Laurent Vivier05f086f2007-09-24 11:10:55 +02001724 emulate_2op_SrcB("ror", c->src, c->dst, ctxt->eflags);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001725 break;
1726 case 2: /* rcl */
Laurent Vivier05f086f2007-09-24 11:10:55 +02001727 emulate_2op_SrcB("rcl", c->src, c->dst, ctxt->eflags);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001728 break;
1729 case 3: /* rcr */
Laurent Vivier05f086f2007-09-24 11:10:55 +02001730 emulate_2op_SrcB("rcr", c->src, c->dst, ctxt->eflags);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001731 break;
1732 case 4: /* sal/shl */
1733 case 6: /* sal/shl */
Laurent Vivier05f086f2007-09-24 11:10:55 +02001734 emulate_2op_SrcB("sal", c->src, c->dst, ctxt->eflags);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001735 break;
1736 case 5: /* shr */
Laurent Vivier05f086f2007-09-24 11:10:55 +02001737 emulate_2op_SrcB("shr", c->src, c->dst, ctxt->eflags);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001738 break;
1739 case 7: /* sar */
Laurent Vivier05f086f2007-09-24 11:10:55 +02001740 emulate_2op_SrcB("sar", c->src, c->dst, ctxt->eflags);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001741 break;
1742 }
Takuya Yoshikawa51187682011-05-02 02:29:17 +09001743 return X86EMUL_CONTINUE;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001744}
1745
Takuya Yoshikawa51187682011-05-02 02:29:17 +09001746static int em_grp3(struct x86_emulate_ctxt *ctxt)
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001747{
1748 struct decode_cache *c = &ctxt->decode;
Mohammed Gamal3f9f53b2010-08-08 21:11:37 +03001749 unsigned long *rax = &c->regs[VCPU_REGS_RAX];
1750 unsigned long *rdx = &c->regs[VCPU_REGS_RDX];
Avi Kivity34d1f492010-08-26 11:59:01 +03001751 u8 de = 0;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001752
1753 switch (c->modrm_reg) {
1754 case 0 ... 1: /* test */
Laurent Vivier05f086f2007-09-24 11:10:55 +02001755 emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001756 break;
1757 case 2: /* not */
1758 c->dst.val = ~c->dst.val;
1759 break;
1760 case 3: /* neg */
Laurent Vivier05f086f2007-09-24 11:10:55 +02001761 emulate_1op("neg", c->dst, ctxt->eflags);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001762 break;
Mohammed Gamal3f9f53b2010-08-08 21:11:37 +03001763 case 4: /* mul */
1764 emulate_1op_rax_rdx("mul", c->src, *rax, *rdx, ctxt->eflags);
1765 break;
1766 case 5: /* imul */
1767 emulate_1op_rax_rdx("imul", c->src, *rax, *rdx, ctxt->eflags);
1768 break;
1769 case 6: /* div */
Avi Kivity34d1f492010-08-26 11:59:01 +03001770 emulate_1op_rax_rdx_ex("div", c->src, *rax, *rdx,
1771 ctxt->eflags, de);
Mohammed Gamal3f9f53b2010-08-08 21:11:37 +03001772 break;
1773 case 7: /* idiv */
Avi Kivity34d1f492010-08-26 11:59:01 +03001774 emulate_1op_rax_rdx_ex("idiv", c->src, *rax, *rdx,
1775 ctxt->eflags, de);
Mohammed Gamal3f9f53b2010-08-08 21:11:37 +03001776 break;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001777 default:
Mohammed Gamal8c5eee32010-08-08 21:11:38 +03001778 return X86EMUL_UNHANDLEABLE;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001779 }
Avi Kivity34d1f492010-08-26 11:59:01 +03001780 if (de)
1781 return emulate_de(ctxt);
Mohammed Gamal8c5eee32010-08-08 21:11:38 +03001782 return X86EMUL_CONTINUE;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001783}
1784
Takuya Yoshikawa51187682011-05-02 02:29:17 +09001785static int em_grp45(struct x86_emulate_ctxt *ctxt)
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001786{
1787 struct decode_cache *c = &ctxt->decode;
Takuya Yoshikawa4179bb02011-04-13 00:29:09 +09001788 int rc = X86EMUL_CONTINUE;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001789
1790 switch (c->modrm_reg) {
1791 case 0: /* inc */
Laurent Vivier05f086f2007-09-24 11:10:55 +02001792 emulate_1op("inc", c->dst, ctxt->eflags);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001793 break;
1794 case 1: /* dec */
Laurent Vivier05f086f2007-09-24 11:10:55 +02001795 emulate_1op("dec", c->dst, ctxt->eflags);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001796 break;
Mohammed Gamald19292e2008-09-08 21:47:19 +03001797 case 2: /* call near abs */ {
1798 long int old_eip;
1799 old_eip = c->eip;
1800 c->eip = c->src.val;
1801 c->src.val = old_eip;
Takuya Yoshikawa4487b3b2011-04-13 00:31:23 +09001802 rc = em_push(ctxt);
Mohammed Gamald19292e2008-09-08 21:47:19 +03001803 break;
1804 }
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001805 case 4: /* jmp abs */
Avi Kivityfd607542008-01-18 13:12:26 +02001806 c->eip = c->src.val;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001807 break;
Takuya Yoshikawad2f62762011-05-02 02:30:48 +09001808 case 5: /* jmp far */
1809 rc = em_jmp_far(ctxt);
1810 break;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001811 case 6: /* push */
Takuya Yoshikawa4487b3b2011-04-13 00:31:23 +09001812 rc = em_push(ctxt);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001813 break;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001814 }
Takuya Yoshikawa4179bb02011-04-13 00:29:09 +09001815 return rc;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001816}
1817
Takuya Yoshikawa51187682011-05-02 02:29:17 +09001818static int em_grp9(struct x86_emulate_ctxt *ctxt)
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001819{
1820 struct decode_cache *c = &ctxt->decode;
Avi Kivity16518d52010-08-26 14:31:30 +03001821 u64 old = c->dst.orig_val64;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001822
1823 if (((u32) (old >> 0) != (u32) c->regs[VCPU_REGS_RAX]) ||
1824 ((u32) (old >> 32) != (u32) c->regs[VCPU_REGS_RDX])) {
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001825 c->regs[VCPU_REGS_RAX] = (u32) (old >> 0);
1826 c->regs[VCPU_REGS_RDX] = (u32) (old >> 32);
Laurent Vivier05f086f2007-09-24 11:10:55 +02001827 ctxt->eflags &= ~EFLG_ZF;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001828 } else {
Avi Kivity16518d52010-08-26 14:31:30 +03001829 c->dst.val64 = ((u64)c->regs[VCPU_REGS_RCX] << 32) |
1830 (u32) c->regs[VCPU_REGS_RBX];
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001831
Laurent Vivier05f086f2007-09-24 11:10:55 +02001832 ctxt->eflags |= EFLG_ZF;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001833 }
Takuya Yoshikawa1b30eaa2010-02-12 15:57:56 +09001834 return X86EMUL_CONTINUE;
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02001835}
1836
Avi Kivitya77ab5e2009-01-05 13:27:34 +02001837static int emulate_ret_far(struct x86_emulate_ctxt *ctxt,
1838 struct x86_emulate_ops *ops)
1839{
1840 struct decode_cache *c = &ctxt->decode;
1841 int rc;
1842 unsigned long cs;
1843
Takuya Yoshikawa3b9be3b2011-05-02 02:27:55 +09001844 rc = emulate_pop(ctxt, &c->eip, c->op_bytes);
Takuya Yoshikawa1b30eaa2010-02-12 15:57:56 +09001845 if (rc != X86EMUL_CONTINUE)
Avi Kivitya77ab5e2009-01-05 13:27:34 +02001846 return rc;
1847 if (c->op_bytes == 4)
1848 c->eip = (u32)c->eip;
Takuya Yoshikawa3b9be3b2011-05-02 02:27:55 +09001849 rc = emulate_pop(ctxt, &cs, c->op_bytes);
Takuya Yoshikawa1b30eaa2010-02-12 15:57:56 +09001850 if (rc != X86EMUL_CONTINUE)
Avi Kivitya77ab5e2009-01-05 13:27:34 +02001851 return rc;
Gleb Natapov2e873022010-03-18 15:20:18 +02001852 rc = load_segment_descriptor(ctxt, ops, (u16)cs, VCPU_SREG_CS);
Avi Kivitya77ab5e2009-01-05 13:27:34 +02001853 return rc;
1854}
1855
Wei Yongjun09b5f4d2010-08-23 14:56:54 +08001856static int emulate_load_segment(struct x86_emulate_ctxt *ctxt,
1857 struct x86_emulate_ops *ops, int seg)
1858{
1859 struct decode_cache *c = &ctxt->decode;
1860 unsigned short sel;
1861 int rc;
1862
1863 memcpy(&sel, c->src.valptr + c->op_bytes, 2);
1864
1865 rc = load_segment_descriptor(ctxt, ops, sel, seg);
1866 if (rc != X86EMUL_CONTINUE)
1867 return rc;
1868
1869 c->dst.val = c->src.val;
1870 return rc;
1871}
1872
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001873static inline void
1874setup_syscalls_segments(struct x86_emulate_ctxt *ctxt,
Gleb Natapov79168fd2010-04-28 19:15:30 +03001875 struct x86_emulate_ops *ops, struct desc_struct *cs,
1876 struct desc_struct *ss)
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001877{
Avi Kivity1aa36612011-04-27 13:20:30 +03001878 u16 selector;
1879
Gleb Natapov79168fd2010-04-28 19:15:30 +03001880 memset(cs, 0, sizeof(struct desc_struct));
Avi Kivity1aa36612011-04-27 13:20:30 +03001881 ops->get_segment(ctxt, &selector, cs, NULL, VCPU_SREG_CS);
Gleb Natapov79168fd2010-04-28 19:15:30 +03001882 memset(ss, 0, sizeof(struct desc_struct));
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001883
1884 cs->l = 0; /* will be adjusted later */
Gleb Natapov79168fd2010-04-28 19:15:30 +03001885 set_desc_base(cs, 0); /* flat segment */
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001886 cs->g = 1; /* 4kb granularity */
Gleb Natapov79168fd2010-04-28 19:15:30 +03001887 set_desc_limit(cs, 0xfffff); /* 4GB limit */
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001888 cs->type = 0x0b; /* Read, Execute, Accessed */
1889 cs->s = 1;
1890 cs->dpl = 0; /* will be adjusted later */
Gleb Natapov79168fd2010-04-28 19:15:30 +03001891 cs->p = 1;
1892 cs->d = 1;
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001893
Gleb Natapov79168fd2010-04-28 19:15:30 +03001894 set_desc_base(ss, 0); /* flat segment */
1895 set_desc_limit(ss, 0xfffff); /* 4GB limit */
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001896 ss->g = 1; /* 4kb granularity */
1897 ss->s = 1;
1898 ss->type = 0x03; /* Read/Write, Accessed */
Gleb Natapov79168fd2010-04-28 19:15:30 +03001899 ss->d = 1; /* 32bit stack segment */
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001900 ss->dpl = 0;
Gleb Natapov79168fd2010-04-28 19:15:30 +03001901 ss->p = 1;
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001902}
1903
1904static int
Gleb Natapov3fb1b5d2010-04-28 19:15:28 +03001905emulate_syscall(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001906{
1907 struct decode_cache *c = &ctxt->decode;
Gleb Natapov79168fd2010-04-28 19:15:30 +03001908 struct desc_struct cs, ss;
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001909 u64 msr_data;
Gleb Natapov79168fd2010-04-28 19:15:30 +03001910 u16 cs_sel, ss_sel;
Avi Kivityc2ad2bb2011-04-20 15:21:35 +03001911 u64 efer = 0;
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001912
1913 /* syscall is not available in real mode */
Gleb Natapov2e901c42010-03-18 15:20:12 +02001914 if (ctxt->mode == X86EMUL_MODE_REAL ||
Avi Kivity35d3d4a2010-11-22 17:53:25 +02001915 ctxt->mode == X86EMUL_MODE_VM86)
1916 return emulate_ud(ctxt);
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001917
Avi Kivityc2ad2bb2011-04-20 15:21:35 +03001918 ops->get_msr(ctxt, MSR_EFER, &efer);
Gleb Natapov79168fd2010-04-28 19:15:30 +03001919 setup_syscalls_segments(ctxt, ops, &cs, &ss);
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001920
Avi Kivity717746e2011-04-20 13:37:53 +03001921 ops->get_msr(ctxt, MSR_STAR, &msr_data);
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001922 msr_data >>= 32;
Gleb Natapov79168fd2010-04-28 19:15:30 +03001923 cs_sel = (u16)(msr_data & 0xfffc);
1924 ss_sel = (u16)(msr_data + 8);
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001925
Avi Kivityc2ad2bb2011-04-20 15:21:35 +03001926 if (efer & EFER_LMA) {
Gleb Natapov79168fd2010-04-28 19:15:30 +03001927 cs.d = 0;
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001928 cs.l = 1;
1929 }
Avi Kivity1aa36612011-04-27 13:20:30 +03001930 ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
1931 ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001932
1933 c->regs[VCPU_REGS_RCX] = c->eip;
Avi Kivityc2ad2bb2011-04-20 15:21:35 +03001934 if (efer & EFER_LMA) {
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001935#ifdef CONFIG_X86_64
1936 c->regs[VCPU_REGS_R11] = ctxt->eflags & ~EFLG_RF;
1937
Avi Kivity717746e2011-04-20 13:37:53 +03001938 ops->get_msr(ctxt,
Gleb Natapov3fb1b5d2010-04-28 19:15:28 +03001939 ctxt->mode == X86EMUL_MODE_PROT64 ?
1940 MSR_LSTAR : MSR_CSTAR, &msr_data);
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001941 c->eip = msr_data;
1942
Avi Kivity717746e2011-04-20 13:37:53 +03001943 ops->get_msr(ctxt, MSR_SYSCALL_MASK, &msr_data);
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001944 ctxt->eflags &= ~(msr_data | EFLG_RF);
1945#endif
1946 } else {
1947 /* legacy mode */
Avi Kivity717746e2011-04-20 13:37:53 +03001948 ops->get_msr(ctxt, MSR_STAR, &msr_data);
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001949 c->eip = (u32)msr_data;
1950
1951 ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF);
1952 }
1953
Takuya Yoshikawae54cfa92010-02-18 12:15:02 +02001954 return X86EMUL_CONTINUE;
Andre Przywarae66bb2c2009-06-18 12:56:00 +02001955}
1956
Andre Przywara8c604352009-06-18 12:56:01 +02001957static int
Gleb Natapov3fb1b5d2010-04-28 19:15:28 +03001958emulate_sysenter(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
Andre Przywara8c604352009-06-18 12:56:01 +02001959{
1960 struct decode_cache *c = &ctxt->decode;
Gleb Natapov79168fd2010-04-28 19:15:30 +03001961 struct desc_struct cs, ss;
Andre Przywara8c604352009-06-18 12:56:01 +02001962 u64 msr_data;
Gleb Natapov79168fd2010-04-28 19:15:30 +03001963 u16 cs_sel, ss_sel;
Avi Kivityc2ad2bb2011-04-20 15:21:35 +03001964 u64 efer = 0;
Andre Przywara8c604352009-06-18 12:56:01 +02001965
Avi Kivityc2ad2bb2011-04-20 15:21:35 +03001966 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
Gleb Natapova0044752010-02-10 14:21:31 +02001967 /* inject #GP if in real mode */
Avi Kivity35d3d4a2010-11-22 17:53:25 +02001968 if (ctxt->mode == X86EMUL_MODE_REAL)
1969 return emulate_gp(ctxt, 0);
Andre Przywara8c604352009-06-18 12:56:01 +02001970
1971 /* XXX sysenter/sysexit have not been tested in 64bit mode.
1972 * Therefore, we inject an #UD.
1973 */
Avi Kivity35d3d4a2010-11-22 17:53:25 +02001974 if (ctxt->mode == X86EMUL_MODE_PROT64)
1975 return emulate_ud(ctxt);
Andre Przywara8c604352009-06-18 12:56:01 +02001976
Gleb Natapov79168fd2010-04-28 19:15:30 +03001977 setup_syscalls_segments(ctxt, ops, &cs, &ss);
Andre Przywara8c604352009-06-18 12:56:01 +02001978
Avi Kivity717746e2011-04-20 13:37:53 +03001979 ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data);
Andre Przywara8c604352009-06-18 12:56:01 +02001980 switch (ctxt->mode) {
1981 case X86EMUL_MODE_PROT32:
Avi Kivity35d3d4a2010-11-22 17:53:25 +02001982 if ((msr_data & 0xfffc) == 0x0)
1983 return emulate_gp(ctxt, 0);
Andre Przywara8c604352009-06-18 12:56:01 +02001984 break;
1985 case X86EMUL_MODE_PROT64:
Avi Kivity35d3d4a2010-11-22 17:53:25 +02001986 if (msr_data == 0x0)
1987 return emulate_gp(ctxt, 0);
Andre Przywara8c604352009-06-18 12:56:01 +02001988 break;
1989 }
1990
1991 ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF);
Gleb Natapov79168fd2010-04-28 19:15:30 +03001992 cs_sel = (u16)msr_data;
1993 cs_sel &= ~SELECTOR_RPL_MASK;
1994 ss_sel = cs_sel + 8;
1995 ss_sel &= ~SELECTOR_RPL_MASK;
Avi Kivityc2ad2bb2011-04-20 15:21:35 +03001996 if (ctxt->mode == X86EMUL_MODE_PROT64 || (efer & EFER_LMA)) {
Gleb Natapov79168fd2010-04-28 19:15:30 +03001997 cs.d = 0;
Andre Przywara8c604352009-06-18 12:56:01 +02001998 cs.l = 1;
1999 }
2000
Avi Kivity1aa36612011-04-27 13:20:30 +03002001 ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
2002 ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
Andre Przywara8c604352009-06-18 12:56:01 +02002003
Avi Kivity717746e2011-04-20 13:37:53 +03002004 ops->get_msr(ctxt, MSR_IA32_SYSENTER_EIP, &msr_data);
Andre Przywara8c604352009-06-18 12:56:01 +02002005 c->eip = msr_data;
2006
Avi Kivity717746e2011-04-20 13:37:53 +03002007 ops->get_msr(ctxt, MSR_IA32_SYSENTER_ESP, &msr_data);
Andre Przywara8c604352009-06-18 12:56:01 +02002008 c->regs[VCPU_REGS_RSP] = msr_data;
2009
Takuya Yoshikawae54cfa92010-02-18 12:15:02 +02002010 return X86EMUL_CONTINUE;
Andre Przywara8c604352009-06-18 12:56:01 +02002011}
2012
Andre Przywara4668f052009-06-18 12:56:02 +02002013static int
Gleb Natapov3fb1b5d2010-04-28 19:15:28 +03002014emulate_sysexit(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
Andre Przywara4668f052009-06-18 12:56:02 +02002015{
2016 struct decode_cache *c = &ctxt->decode;
Gleb Natapov79168fd2010-04-28 19:15:30 +03002017 struct desc_struct cs, ss;
Andre Przywara4668f052009-06-18 12:56:02 +02002018 u64 msr_data;
2019 int usermode;
Gleb Natapov79168fd2010-04-28 19:15:30 +03002020 u16 cs_sel, ss_sel;
Andre Przywara4668f052009-06-18 12:56:02 +02002021
Gleb Natapova0044752010-02-10 14:21:31 +02002022 /* inject #GP if in real mode or Virtual 8086 mode */
2023 if (ctxt->mode == X86EMUL_MODE_REAL ||
Avi Kivity35d3d4a2010-11-22 17:53:25 +02002024 ctxt->mode == X86EMUL_MODE_VM86)
2025 return emulate_gp(ctxt, 0);
Andre Przywara4668f052009-06-18 12:56:02 +02002026
Gleb Natapov79168fd2010-04-28 19:15:30 +03002027 setup_syscalls_segments(ctxt, ops, &cs, &ss);
Andre Przywara4668f052009-06-18 12:56:02 +02002028
2029 if ((c->rex_prefix & 0x8) != 0x0)
2030 usermode = X86EMUL_MODE_PROT64;
2031 else
2032 usermode = X86EMUL_MODE_PROT32;
2033
2034 cs.dpl = 3;
2035 ss.dpl = 3;
Avi Kivity717746e2011-04-20 13:37:53 +03002036 ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data);
Andre Przywara4668f052009-06-18 12:56:02 +02002037 switch (usermode) {
2038 case X86EMUL_MODE_PROT32:
Gleb Natapov79168fd2010-04-28 19:15:30 +03002039 cs_sel = (u16)(msr_data + 16);
Avi Kivity35d3d4a2010-11-22 17:53:25 +02002040 if ((msr_data & 0xfffc) == 0x0)
2041 return emulate_gp(ctxt, 0);
Gleb Natapov79168fd2010-04-28 19:15:30 +03002042 ss_sel = (u16)(msr_data + 24);
Andre Przywara4668f052009-06-18 12:56:02 +02002043 break;
2044 case X86EMUL_MODE_PROT64:
Gleb Natapov79168fd2010-04-28 19:15:30 +03002045 cs_sel = (u16)(msr_data + 32);
Avi Kivity35d3d4a2010-11-22 17:53:25 +02002046 if (msr_data == 0x0)
2047 return emulate_gp(ctxt, 0);
Gleb Natapov79168fd2010-04-28 19:15:30 +03002048 ss_sel = cs_sel + 8;
2049 cs.d = 0;
Andre Przywara4668f052009-06-18 12:56:02 +02002050 cs.l = 1;
2051 break;
2052 }
Gleb Natapov79168fd2010-04-28 19:15:30 +03002053 cs_sel |= SELECTOR_RPL_MASK;
2054 ss_sel |= SELECTOR_RPL_MASK;
Andre Przywara4668f052009-06-18 12:56:02 +02002055
Avi Kivity1aa36612011-04-27 13:20:30 +03002056 ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
2057 ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
Andre Przywara4668f052009-06-18 12:56:02 +02002058
Gleb Natapovbdb475a2010-04-28 19:15:41 +03002059 c->eip = c->regs[VCPU_REGS_RDX];
2060 c->regs[VCPU_REGS_RSP] = c->regs[VCPU_REGS_RCX];
Andre Przywara4668f052009-06-18 12:56:02 +02002061
Takuya Yoshikawae54cfa92010-02-18 12:15:02 +02002062 return X86EMUL_CONTINUE;
Andre Przywara4668f052009-06-18 12:56:02 +02002063}
2064
Gleb Natapov9c537242010-03-18 15:20:05 +02002065static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt,
2066 struct x86_emulate_ops *ops)
Gleb Natapovf850e2e2010-02-10 14:21:33 +02002067{
2068 int iopl;
2069 if (ctxt->mode == X86EMUL_MODE_REAL)
2070 return false;
2071 if (ctxt->mode == X86EMUL_MODE_VM86)
2072 return true;
2073 iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
Avi Kivity717746e2011-04-20 13:37:53 +03002074 return ops->cpl(ctxt) > iopl;
Gleb Natapovf850e2e2010-02-10 14:21:33 +02002075}
2076
2077static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt,
2078 struct x86_emulate_ops *ops,
2079 u16 port, u16 len)
2080{
Gleb Natapov79168fd2010-04-28 19:15:30 +03002081 struct desc_struct tr_seg;
Gleb Natapov5601d052011-03-07 14:55:06 +02002082 u32 base3;
Gleb Natapovf850e2e2010-02-10 14:21:33 +02002083 int r;
Avi Kivity1aa36612011-04-27 13:20:30 +03002084 u16 tr, io_bitmap_ptr, perm, bit_idx = port & 0x7;
Gleb Natapovf850e2e2010-02-10 14:21:33 +02002085 unsigned mask = (1 << len) - 1;
Gleb Natapov5601d052011-03-07 14:55:06 +02002086 unsigned long base;
Gleb Natapovf850e2e2010-02-10 14:21:33 +02002087
Avi Kivity1aa36612011-04-27 13:20:30 +03002088 ops->get_segment(ctxt, &tr, &tr_seg, &base3, VCPU_SREG_TR);
Gleb Natapov79168fd2010-04-28 19:15:30 +03002089 if (!tr_seg.p)
Gleb Natapovf850e2e2010-02-10 14:21:33 +02002090 return false;
Gleb Natapov79168fd2010-04-28 19:15:30 +03002091 if (desc_limit_scaled(&tr_seg) < 103)
Gleb Natapovf850e2e2010-02-10 14:21:33 +02002092 return false;
Gleb Natapov5601d052011-03-07 14:55:06 +02002093 base = get_desc_base(&tr_seg);
2094#ifdef CONFIG_X86_64
2095 base |= ((u64)base3) << 32;
2096#endif
Avi Kivity0f65dd72011-04-20 13:37:53 +03002097 r = ops->read_std(ctxt, base + 102, &io_bitmap_ptr, 2, NULL);
Gleb Natapovf850e2e2010-02-10 14:21:33 +02002098 if (r != X86EMUL_CONTINUE)
2099 return false;
Gleb Natapov79168fd2010-04-28 19:15:30 +03002100 if (io_bitmap_ptr + port/8 > desc_limit_scaled(&tr_seg))
Gleb Natapovf850e2e2010-02-10 14:21:33 +02002101 return false;
Avi Kivity0f65dd72011-04-20 13:37:53 +03002102 r = ops->read_std(ctxt, base + io_bitmap_ptr + port/8, &perm, 2, NULL);
Gleb Natapovf850e2e2010-02-10 14:21:33 +02002103 if (r != X86EMUL_CONTINUE)
2104 return false;
2105 if ((perm >> bit_idx) & mask)
2106 return false;
2107 return true;
2108}
2109
2110static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt,
2111 struct x86_emulate_ops *ops,
2112 u16 port, u16 len)
2113{
Gleb Natapov4fc40f02010-08-02 12:47:51 +03002114 if (ctxt->perm_ok)
2115 return true;
2116
Gleb Natapov9c537242010-03-18 15:20:05 +02002117 if (emulator_bad_iopl(ctxt, ops))
Gleb Natapovf850e2e2010-02-10 14:21:33 +02002118 if (!emulator_io_port_access_allowed(ctxt, ops, port, len))
2119 return false;
Gleb Natapov4fc40f02010-08-02 12:47:51 +03002120
2121 ctxt->perm_ok = true;
2122
Gleb Natapovf850e2e2010-02-10 14:21:33 +02002123 return true;
2124}
2125
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002126static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt,
2127 struct x86_emulate_ops *ops,
2128 struct tss_segment_16 *tss)
2129{
2130 struct decode_cache *c = &ctxt->decode;
2131
2132 tss->ip = c->eip;
2133 tss->flag = ctxt->eflags;
2134 tss->ax = c->regs[VCPU_REGS_RAX];
2135 tss->cx = c->regs[VCPU_REGS_RCX];
2136 tss->dx = c->regs[VCPU_REGS_RDX];
2137 tss->bx = c->regs[VCPU_REGS_RBX];
2138 tss->sp = c->regs[VCPU_REGS_RSP];
2139 tss->bp = c->regs[VCPU_REGS_RBP];
2140 tss->si = c->regs[VCPU_REGS_RSI];
2141 tss->di = c->regs[VCPU_REGS_RDI];
2142
Avi Kivity1aa36612011-04-27 13:20:30 +03002143 tss->es = get_segment_selector(ctxt, VCPU_SREG_ES);
2144 tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS);
2145 tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS);
2146 tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS);
2147 tss->ldt = get_segment_selector(ctxt, VCPU_SREG_LDTR);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002148}
2149
2150static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt,
2151 struct x86_emulate_ops *ops,
2152 struct tss_segment_16 *tss)
2153{
2154 struct decode_cache *c = &ctxt->decode;
2155 int ret;
2156
2157 c->eip = tss->ip;
2158 ctxt->eflags = tss->flag | 2;
2159 c->regs[VCPU_REGS_RAX] = tss->ax;
2160 c->regs[VCPU_REGS_RCX] = tss->cx;
2161 c->regs[VCPU_REGS_RDX] = tss->dx;
2162 c->regs[VCPU_REGS_RBX] = tss->bx;
2163 c->regs[VCPU_REGS_RSP] = tss->sp;
2164 c->regs[VCPU_REGS_RBP] = tss->bp;
2165 c->regs[VCPU_REGS_RSI] = tss->si;
2166 c->regs[VCPU_REGS_RDI] = tss->di;
2167
2168 /*
2169 * SDM says that segment selectors are loaded before segment
2170 * descriptors
2171 */
Avi Kivity1aa36612011-04-27 13:20:30 +03002172 set_segment_selector(ctxt, tss->ldt, VCPU_SREG_LDTR);
2173 set_segment_selector(ctxt, tss->es, VCPU_SREG_ES);
2174 set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS);
2175 set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS);
2176 set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002177
2178 /*
2179 * Now load segment descriptors. If fault happenes at this stage
2180 * it is handled in a context of new task
2181 */
2182 ret = load_segment_descriptor(ctxt, ops, tss->ldt, VCPU_SREG_LDTR);
2183 if (ret != X86EMUL_CONTINUE)
2184 return ret;
2185 ret = load_segment_descriptor(ctxt, ops, tss->es, VCPU_SREG_ES);
2186 if (ret != X86EMUL_CONTINUE)
2187 return ret;
2188 ret = load_segment_descriptor(ctxt, ops, tss->cs, VCPU_SREG_CS);
2189 if (ret != X86EMUL_CONTINUE)
2190 return ret;
2191 ret = load_segment_descriptor(ctxt, ops, tss->ss, VCPU_SREG_SS);
2192 if (ret != X86EMUL_CONTINUE)
2193 return ret;
2194 ret = load_segment_descriptor(ctxt, ops, tss->ds, VCPU_SREG_DS);
2195 if (ret != X86EMUL_CONTINUE)
2196 return ret;
2197
2198 return X86EMUL_CONTINUE;
2199}
2200
2201static int task_switch_16(struct x86_emulate_ctxt *ctxt,
2202 struct x86_emulate_ops *ops,
2203 u16 tss_selector, u16 old_tss_sel,
2204 ulong old_tss_base, struct desc_struct *new_desc)
2205{
2206 struct tss_segment_16 tss_seg;
2207 int ret;
Avi Kivitybcc55cb2010-11-22 17:53:22 +02002208 u32 new_tss_base = get_desc_base(new_desc);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002209
Avi Kivity0f65dd72011-04-20 13:37:53 +03002210 ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
Avi Kivitybcc55cb2010-11-22 17:53:22 +02002211 &ctxt->exception);
Avi Kivitydb297e32010-11-22 17:53:24 +02002212 if (ret != X86EMUL_CONTINUE)
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002213 /* FIXME: need to provide precise fault address */
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002214 return ret;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002215
2216 save_state_to_tss16(ctxt, ops, &tss_seg);
2217
Avi Kivity0f65dd72011-04-20 13:37:53 +03002218 ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
Avi Kivitybcc55cb2010-11-22 17:53:22 +02002219 &ctxt->exception);
Avi Kivitydb297e32010-11-22 17:53:24 +02002220 if (ret != X86EMUL_CONTINUE)
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002221 /* FIXME: need to provide precise fault address */
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002222 return ret;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002223
Avi Kivity0f65dd72011-04-20 13:37:53 +03002224 ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg,
Avi Kivitybcc55cb2010-11-22 17:53:22 +02002225 &ctxt->exception);
Avi Kivitydb297e32010-11-22 17:53:24 +02002226 if (ret != X86EMUL_CONTINUE)
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002227 /* FIXME: need to provide precise fault address */
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002228 return ret;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002229
2230 if (old_tss_sel != 0xffff) {
2231 tss_seg.prev_task_link = old_tss_sel;
2232
Avi Kivity0f65dd72011-04-20 13:37:53 +03002233 ret = ops->write_std(ctxt, new_tss_base,
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002234 &tss_seg.prev_task_link,
2235 sizeof tss_seg.prev_task_link,
Avi Kivity0f65dd72011-04-20 13:37:53 +03002236 &ctxt->exception);
Avi Kivitydb297e32010-11-22 17:53:24 +02002237 if (ret != X86EMUL_CONTINUE)
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002238 /* FIXME: need to provide precise fault address */
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002239 return ret;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002240 }
2241
2242 return load_state_from_tss16(ctxt, ops, &tss_seg);
2243}
2244
2245static void save_state_to_tss32(struct x86_emulate_ctxt *ctxt,
2246 struct x86_emulate_ops *ops,
2247 struct tss_segment_32 *tss)
2248{
2249 struct decode_cache *c = &ctxt->decode;
2250
Avi Kivity717746e2011-04-20 13:37:53 +03002251 tss->cr3 = ops->get_cr(ctxt, 3);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002252 tss->eip = c->eip;
2253 tss->eflags = ctxt->eflags;
2254 tss->eax = c->regs[VCPU_REGS_RAX];
2255 tss->ecx = c->regs[VCPU_REGS_RCX];
2256 tss->edx = c->regs[VCPU_REGS_RDX];
2257 tss->ebx = c->regs[VCPU_REGS_RBX];
2258 tss->esp = c->regs[VCPU_REGS_RSP];
2259 tss->ebp = c->regs[VCPU_REGS_RBP];
2260 tss->esi = c->regs[VCPU_REGS_RSI];
2261 tss->edi = c->regs[VCPU_REGS_RDI];
2262
Avi Kivity1aa36612011-04-27 13:20:30 +03002263 tss->es = get_segment_selector(ctxt, VCPU_SREG_ES);
2264 tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS);
2265 tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS);
2266 tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS);
2267 tss->fs = get_segment_selector(ctxt, VCPU_SREG_FS);
2268 tss->gs = get_segment_selector(ctxt, VCPU_SREG_GS);
2269 tss->ldt_selector = get_segment_selector(ctxt, VCPU_SREG_LDTR);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002270}
2271
2272static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt,
2273 struct x86_emulate_ops *ops,
2274 struct tss_segment_32 *tss)
2275{
2276 struct decode_cache *c = &ctxt->decode;
2277 int ret;
2278
Avi Kivity717746e2011-04-20 13:37:53 +03002279 if (ops->set_cr(ctxt, 3, tss->cr3))
Avi Kivity35d3d4a2010-11-22 17:53:25 +02002280 return emulate_gp(ctxt, 0);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002281 c->eip = tss->eip;
2282 ctxt->eflags = tss->eflags | 2;
2283 c->regs[VCPU_REGS_RAX] = tss->eax;
2284 c->regs[VCPU_REGS_RCX] = tss->ecx;
2285 c->regs[VCPU_REGS_RDX] = tss->edx;
2286 c->regs[VCPU_REGS_RBX] = tss->ebx;
2287 c->regs[VCPU_REGS_RSP] = tss->esp;
2288 c->regs[VCPU_REGS_RBP] = tss->ebp;
2289 c->regs[VCPU_REGS_RSI] = tss->esi;
2290 c->regs[VCPU_REGS_RDI] = tss->edi;
2291
2292 /*
2293 * SDM says that segment selectors are loaded before segment
2294 * descriptors
2295 */
Avi Kivity1aa36612011-04-27 13:20:30 +03002296 set_segment_selector(ctxt, tss->ldt_selector, VCPU_SREG_LDTR);
2297 set_segment_selector(ctxt, tss->es, VCPU_SREG_ES);
2298 set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS);
2299 set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS);
2300 set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS);
2301 set_segment_selector(ctxt, tss->fs, VCPU_SREG_FS);
2302 set_segment_selector(ctxt, tss->gs, VCPU_SREG_GS);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002303
2304 /*
2305 * Now load segment descriptors. If fault happenes at this stage
2306 * it is handled in a context of new task
2307 */
2308 ret = load_segment_descriptor(ctxt, ops, tss->ldt_selector, VCPU_SREG_LDTR);
2309 if (ret != X86EMUL_CONTINUE)
2310 return ret;
2311 ret = load_segment_descriptor(ctxt, ops, tss->es, VCPU_SREG_ES);
2312 if (ret != X86EMUL_CONTINUE)
2313 return ret;
2314 ret = load_segment_descriptor(ctxt, ops, tss->cs, VCPU_SREG_CS);
2315 if (ret != X86EMUL_CONTINUE)
2316 return ret;
2317 ret = load_segment_descriptor(ctxt, ops, tss->ss, VCPU_SREG_SS);
2318 if (ret != X86EMUL_CONTINUE)
2319 return ret;
2320 ret = load_segment_descriptor(ctxt, ops, tss->ds, VCPU_SREG_DS);
2321 if (ret != X86EMUL_CONTINUE)
2322 return ret;
2323 ret = load_segment_descriptor(ctxt, ops, tss->fs, VCPU_SREG_FS);
2324 if (ret != X86EMUL_CONTINUE)
2325 return ret;
2326 ret = load_segment_descriptor(ctxt, ops, tss->gs, VCPU_SREG_GS);
2327 if (ret != X86EMUL_CONTINUE)
2328 return ret;
2329
2330 return X86EMUL_CONTINUE;
2331}
2332
2333static int task_switch_32(struct x86_emulate_ctxt *ctxt,
2334 struct x86_emulate_ops *ops,
2335 u16 tss_selector, u16 old_tss_sel,
2336 ulong old_tss_base, struct desc_struct *new_desc)
2337{
2338 struct tss_segment_32 tss_seg;
2339 int ret;
Avi Kivitybcc55cb2010-11-22 17:53:22 +02002340 u32 new_tss_base = get_desc_base(new_desc);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002341
Avi Kivity0f65dd72011-04-20 13:37:53 +03002342 ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
Avi Kivitybcc55cb2010-11-22 17:53:22 +02002343 &ctxt->exception);
Avi Kivitydb297e32010-11-22 17:53:24 +02002344 if (ret != X86EMUL_CONTINUE)
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002345 /* FIXME: need to provide precise fault address */
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002346 return ret;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002347
2348 save_state_to_tss32(ctxt, ops, &tss_seg);
2349
Avi Kivity0f65dd72011-04-20 13:37:53 +03002350 ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
Avi Kivitybcc55cb2010-11-22 17:53:22 +02002351 &ctxt->exception);
Avi Kivitydb297e32010-11-22 17:53:24 +02002352 if (ret != X86EMUL_CONTINUE)
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002353 /* FIXME: need to provide precise fault address */
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002354 return ret;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002355
Avi Kivity0f65dd72011-04-20 13:37:53 +03002356 ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg,
Avi Kivitybcc55cb2010-11-22 17:53:22 +02002357 &ctxt->exception);
Avi Kivitydb297e32010-11-22 17:53:24 +02002358 if (ret != X86EMUL_CONTINUE)
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002359 /* FIXME: need to provide precise fault address */
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002360 return ret;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002361
2362 if (old_tss_sel != 0xffff) {
2363 tss_seg.prev_task_link = old_tss_sel;
2364
Avi Kivity0f65dd72011-04-20 13:37:53 +03002365 ret = ops->write_std(ctxt, new_tss_base,
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002366 &tss_seg.prev_task_link,
2367 sizeof tss_seg.prev_task_link,
Avi Kivity0f65dd72011-04-20 13:37:53 +03002368 &ctxt->exception);
Avi Kivitydb297e32010-11-22 17:53:24 +02002369 if (ret != X86EMUL_CONTINUE)
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002370 /* FIXME: need to provide precise fault address */
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002371 return ret;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002372 }
2373
2374 return load_state_from_tss32(ctxt, ops, &tss_seg);
2375}
2376
2377static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
Jan Kiszkae269fb22010-04-14 15:51:09 +02002378 struct x86_emulate_ops *ops,
2379 u16 tss_selector, int reason,
2380 bool has_error_code, u32 error_code)
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002381{
2382 struct desc_struct curr_tss_desc, next_tss_desc;
2383 int ret;
Avi Kivity1aa36612011-04-27 13:20:30 +03002384 u16 old_tss_sel = get_segment_selector(ctxt, VCPU_SREG_TR);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002385 ulong old_tss_base =
Avi Kivity4bff1e862011-04-20 13:37:53 +03002386 ops->get_cached_segment_base(ctxt, VCPU_SREG_TR);
Gleb Natapovceffb452010-03-18 15:20:19 +02002387 u32 desc_limit;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002388
2389 /* FIXME: old_tss_base == ~0 ? */
2390
2391 ret = read_segment_descriptor(ctxt, ops, tss_selector, &next_tss_desc);
2392 if (ret != X86EMUL_CONTINUE)
2393 return ret;
2394 ret = read_segment_descriptor(ctxt, ops, old_tss_sel, &curr_tss_desc);
2395 if (ret != X86EMUL_CONTINUE)
2396 return ret;
2397
2398 /* FIXME: check that next_tss_desc is tss */
2399
2400 if (reason != TASK_SWITCH_IRET) {
2401 if ((tss_selector & 3) > next_tss_desc.dpl ||
Avi Kivity717746e2011-04-20 13:37:53 +03002402 ops->cpl(ctxt) > next_tss_desc.dpl)
Avi Kivity35d3d4a2010-11-22 17:53:25 +02002403 return emulate_gp(ctxt, 0);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002404 }
2405
Gleb Natapovceffb452010-03-18 15:20:19 +02002406 desc_limit = desc_limit_scaled(&next_tss_desc);
2407 if (!next_tss_desc.p ||
2408 ((desc_limit < 0x67 && (next_tss_desc.type & 8)) ||
2409 desc_limit < 0x2b)) {
Gleb Natapov54b84862010-04-28 19:15:44 +03002410 emulate_ts(ctxt, tss_selector & 0xfffc);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002411 return X86EMUL_PROPAGATE_FAULT;
2412 }
2413
2414 if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
2415 curr_tss_desc.type &= ~(1 << 1); /* clear busy flag */
2416 write_segment_descriptor(ctxt, ops, old_tss_sel,
2417 &curr_tss_desc);
2418 }
2419
2420 if (reason == TASK_SWITCH_IRET)
2421 ctxt->eflags = ctxt->eflags & ~X86_EFLAGS_NT;
2422
2423 /* set back link to prev task only if NT bit is set in eflags
2424 note that old_tss_sel is not used afetr this point */
2425 if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE)
2426 old_tss_sel = 0xffff;
2427
2428 if (next_tss_desc.type & 8)
2429 ret = task_switch_32(ctxt, ops, tss_selector, old_tss_sel,
2430 old_tss_base, &next_tss_desc);
2431 else
2432 ret = task_switch_16(ctxt, ops, tss_selector, old_tss_sel,
2433 old_tss_base, &next_tss_desc);
Jan Kiszka0760d442010-04-14 15:50:57 +02002434 if (ret != X86EMUL_CONTINUE)
2435 return ret;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002436
2437 if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE)
2438 ctxt->eflags = ctxt->eflags | X86_EFLAGS_NT;
2439
2440 if (reason != TASK_SWITCH_IRET) {
2441 next_tss_desc.type |= (1 << 1); /* set busy flag */
2442 write_segment_descriptor(ctxt, ops, tss_selector,
2443 &next_tss_desc);
2444 }
2445
Avi Kivity717746e2011-04-20 13:37:53 +03002446 ops->set_cr(ctxt, 0, ops->get_cr(ctxt, 0) | X86_CR0_TS);
Avi Kivity1aa36612011-04-27 13:20:30 +03002447 ops->set_segment(ctxt, tss_selector, &next_tss_desc, 0, VCPU_SREG_TR);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002448
Jan Kiszkae269fb22010-04-14 15:51:09 +02002449 if (has_error_code) {
2450 struct decode_cache *c = &ctxt->decode;
2451
2452 c->op_bytes = c->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2;
2453 c->lock_prefix = 0;
2454 c->src.val = (unsigned long) error_code;
Takuya Yoshikawa4487b3b2011-04-13 00:31:23 +09002455 ret = em_push(ctxt);
Jan Kiszkae269fb22010-04-14 15:51:09 +02002456 }
2457
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002458 return ret;
2459}
2460
2461int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
Jan Kiszkae269fb22010-04-14 15:51:09 +02002462 u16 tss_selector, int reason,
2463 bool has_error_code, u32 error_code)
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002464{
Avi Kivity9aabc882010-07-29 15:11:50 +03002465 struct x86_emulate_ops *ops = ctxt->ops;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002466 struct decode_cache *c = &ctxt->decode;
2467 int rc;
2468
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002469 c->eip = ctxt->eip;
Jan Kiszkae269fb22010-04-14 15:51:09 +02002470 c->dst.type = OP_NONE;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002471
Jan Kiszkae269fb22010-04-14 15:51:09 +02002472 rc = emulator_do_task_switch(ctxt, ops, tss_selector, reason,
2473 has_error_code, error_code);
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002474
Takuya Yoshikawa4179bb02011-04-13 00:29:09 +09002475 if (rc == X86EMUL_CONTINUE)
2476 ctxt->eip = c->eip;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002477
Gleb Natapova0c0ab22011-03-28 16:57:49 +02002478 return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
Gleb Natapov38ba30b2010-03-18 15:20:17 +02002479}
2480
Avi Kivity90de84f2010-11-17 15:28:21 +02002481static void string_addr_inc(struct x86_emulate_ctxt *ctxt, unsigned seg,
Gleb Natapovd9271122010-03-18 15:20:22 +02002482 int reg, struct operand *op)
Gleb Natapova682e352010-03-18 15:20:21 +02002483{
2484 struct decode_cache *c = &ctxt->decode;
2485 int df = (ctxt->eflags & EFLG_DF) ? -1 : 1;
2486
Gleb Natapovd9271122010-03-18 15:20:22 +02002487 register_address_increment(c, &c->regs[reg], df * op->bytes);
Avi Kivity90de84f2010-11-17 15:28:21 +02002488 op->addr.mem.ea = register_address(c, c->regs[reg]);
2489 op->addr.mem.seg = seg;
Gleb Natapova682e352010-03-18 15:20:21 +02002490}
2491
Avi Kivity7af04fc2010-08-18 14:16:35 +03002492static int em_das(struct x86_emulate_ctxt *ctxt)
2493{
2494 struct decode_cache *c = &ctxt->decode;
2495 u8 al, old_al;
2496 bool af, cf, old_cf;
2497
2498 cf = ctxt->eflags & X86_EFLAGS_CF;
2499 al = c->dst.val;
2500
2501 old_al = al;
2502 old_cf = cf;
2503 cf = false;
2504 af = ctxt->eflags & X86_EFLAGS_AF;
2505 if ((al & 0x0f) > 9 || af) {
2506 al -= 6;
2507 cf = old_cf | (al >= 250);
2508 af = true;
2509 } else {
2510 af = false;
2511 }
2512 if (old_al > 0x99 || old_cf) {
2513 al -= 0x60;
2514 cf = true;
2515 }
2516
2517 c->dst.val = al;
2518 /* Set PF, ZF, SF */
2519 c->src.type = OP_IMM;
2520 c->src.val = 0;
2521 c->src.bytes = 1;
2522 emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags);
2523 ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF);
2524 if (cf)
2525 ctxt->eflags |= X86_EFLAGS_CF;
2526 if (af)
2527 ctxt->eflags |= X86_EFLAGS_AF;
2528 return X86EMUL_CONTINUE;
2529}
2530
Avi Kivity0ef753b2010-08-18 14:51:45 +03002531static int em_call_far(struct x86_emulate_ctxt *ctxt)
2532{
2533 struct decode_cache *c = &ctxt->decode;
2534 u16 sel, old_cs;
2535 ulong old_eip;
2536 int rc;
2537
Avi Kivity1aa36612011-04-27 13:20:30 +03002538 old_cs = get_segment_selector(ctxt, VCPU_SREG_CS);
Avi Kivity0ef753b2010-08-18 14:51:45 +03002539 old_eip = c->eip;
2540
2541 memcpy(&sel, c->src.valptr + c->op_bytes, 2);
2542 if (load_segment_descriptor(ctxt, ctxt->ops, sel, VCPU_SREG_CS))
2543 return X86EMUL_CONTINUE;
2544
2545 c->eip = 0;
2546 memcpy(&c->eip, c->src.valptr, c->op_bytes);
2547
2548 c->src.val = old_cs;
Takuya Yoshikawa4487b3b2011-04-13 00:31:23 +09002549 rc = em_push(ctxt);
Avi Kivity0ef753b2010-08-18 14:51:45 +03002550 if (rc != X86EMUL_CONTINUE)
2551 return rc;
2552
2553 c->src.val = old_eip;
Takuya Yoshikawa4487b3b2011-04-13 00:31:23 +09002554 return em_push(ctxt);
Avi Kivity0ef753b2010-08-18 14:51:45 +03002555}
2556
Avi Kivity40ece7c2010-08-18 15:12:09 +03002557static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt)
2558{
2559 struct decode_cache *c = &ctxt->decode;
2560 int rc;
2561
2562 c->dst.type = OP_REG;
2563 c->dst.addr.reg = &c->eip;
2564 c->dst.bytes = c->op_bytes;
Takuya Yoshikawa3b9be3b2011-05-02 02:27:55 +09002565 rc = emulate_pop(ctxt, &c->dst.val, c->op_bytes);
Avi Kivity40ece7c2010-08-18 15:12:09 +03002566 if (rc != X86EMUL_CONTINUE)
2567 return rc;
2568 register_address_increment(c, &c->regs[VCPU_REGS_RSP], c->src.val);
2569 return X86EMUL_CONTINUE;
2570}
2571
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09002572static int em_add(struct x86_emulate_ctxt *ctxt)
2573{
2574 struct decode_cache *c = &ctxt->decode;
2575
2576 emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags);
2577 return X86EMUL_CONTINUE;
2578}
2579
2580static int em_or(struct x86_emulate_ctxt *ctxt)
2581{
2582 struct decode_cache *c = &ctxt->decode;
2583
2584 emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags);
2585 return X86EMUL_CONTINUE;
2586}
2587
2588static int em_adc(struct x86_emulate_ctxt *ctxt)
2589{
2590 struct decode_cache *c = &ctxt->decode;
2591
2592 emulate_2op_SrcV("adc", c->src, c->dst, ctxt->eflags);
2593 return X86EMUL_CONTINUE;
2594}
2595
2596static int em_sbb(struct x86_emulate_ctxt *ctxt)
2597{
2598 struct decode_cache *c = &ctxt->decode;
2599
2600 emulate_2op_SrcV("sbb", c->src, c->dst, ctxt->eflags);
2601 return X86EMUL_CONTINUE;
2602}
2603
2604static int em_and(struct x86_emulate_ctxt *ctxt)
2605{
2606 struct decode_cache *c = &ctxt->decode;
2607
2608 emulate_2op_SrcV("and", c->src, c->dst, ctxt->eflags);
2609 return X86EMUL_CONTINUE;
2610}
2611
2612static int em_sub(struct x86_emulate_ctxt *ctxt)
2613{
2614 struct decode_cache *c = &ctxt->decode;
2615
2616 emulate_2op_SrcV("sub", c->src, c->dst, ctxt->eflags);
2617 return X86EMUL_CONTINUE;
2618}
2619
2620static int em_xor(struct x86_emulate_ctxt *ctxt)
2621{
2622 struct decode_cache *c = &ctxt->decode;
2623
2624 emulate_2op_SrcV("xor", c->src, c->dst, ctxt->eflags);
2625 return X86EMUL_CONTINUE;
2626}
2627
2628static int em_cmp(struct x86_emulate_ctxt *ctxt)
2629{
2630 struct decode_cache *c = &ctxt->decode;
2631
2632 emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
2633 /* Disable writeback. */
2634 c->dst.type = OP_NONE;
2635 return X86EMUL_CONTINUE;
2636}
2637
Avi Kivity5c82aa22010-08-18 18:31:43 +03002638static int em_imul(struct x86_emulate_ctxt *ctxt)
2639{
2640 struct decode_cache *c = &ctxt->decode;
2641
2642 emulate_2op_SrcV_nobyte("imul", c->src, c->dst, ctxt->eflags);
2643 return X86EMUL_CONTINUE;
2644}
2645
Avi Kivityf3a1b9f2010-08-18 18:25:25 +03002646static int em_imul_3op(struct x86_emulate_ctxt *ctxt)
2647{
2648 struct decode_cache *c = &ctxt->decode;
2649
2650 c->dst.val = c->src2.val;
Avi Kivity5c82aa22010-08-18 18:31:43 +03002651 return em_imul(ctxt);
Avi Kivityf3a1b9f2010-08-18 18:25:25 +03002652}
2653
Avi Kivity61429142010-08-19 15:13:00 +03002654static int em_cwd(struct x86_emulate_ctxt *ctxt)
2655{
2656 struct decode_cache *c = &ctxt->decode;
2657
2658 c->dst.type = OP_REG;
2659 c->dst.bytes = c->src.bytes;
2660 c->dst.addr.reg = &c->regs[VCPU_REGS_RDX];
2661 c->dst.val = ~((c->src.val >> (c->src.bytes * 8 - 1)) - 1);
2662
2663 return X86EMUL_CONTINUE;
2664}
2665
Avi Kivity48bb5d32010-08-18 18:54:34 +03002666static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
2667{
Avi Kivity48bb5d32010-08-18 18:54:34 +03002668 struct decode_cache *c = &ctxt->decode;
2669 u64 tsc = 0;
2670
Avi Kivity717746e2011-04-20 13:37:53 +03002671 ctxt->ops->get_msr(ctxt, MSR_IA32_TSC, &tsc);
Avi Kivity48bb5d32010-08-18 18:54:34 +03002672 c->regs[VCPU_REGS_RAX] = (u32)tsc;
2673 c->regs[VCPU_REGS_RDX] = tsc >> 32;
2674 return X86EMUL_CONTINUE;
2675}
2676
Avi Kivityb9eac5f2010-08-03 14:46:56 +03002677static int em_mov(struct x86_emulate_ctxt *ctxt)
2678{
2679 struct decode_cache *c = &ctxt->decode;
2680 c->dst.val = c->src.val;
2681 return X86EMUL_CONTINUE;
2682}
2683
Avi Kivityaa97bb42010-01-20 18:09:23 +02002684static int em_movdqu(struct x86_emulate_ctxt *ctxt)
2685{
2686 struct decode_cache *c = &ctxt->decode;
2687 memcpy(&c->dst.vec_val, &c->src.vec_val, c->op_bytes);
2688 return X86EMUL_CONTINUE;
2689}
2690
Avi Kivity38503912011-03-31 18:48:09 +02002691static int em_invlpg(struct x86_emulate_ctxt *ctxt)
2692{
2693 struct decode_cache *c = &ctxt->decode;
Avi Kivity9fa088f2011-03-31 18:54:30 +02002694 int rc;
2695 ulong linear;
2696
Avi Kivity83b87952011-04-03 11:31:19 +03002697 rc = linearize(ctxt, c->src.addr.mem, 1, false, &linear);
Avi Kivity9fa088f2011-03-31 18:54:30 +02002698 if (rc == X86EMUL_CONTINUE)
Avi Kivity3cb16fe2011-04-20 15:38:44 +03002699 ctxt->ops->invlpg(ctxt, linear);
Avi Kivity38503912011-03-31 18:48:09 +02002700 /* Disable writeback. */
2701 c->dst.type = OP_NONE;
2702 return X86EMUL_CONTINUE;
2703}
2704
Avi Kivity2d04a052011-04-20 15:32:49 +03002705static int em_clts(struct x86_emulate_ctxt *ctxt)
2706{
2707 ulong cr0;
2708
2709 cr0 = ctxt->ops->get_cr(ctxt, 0);
2710 cr0 &= ~X86_CR0_TS;
2711 ctxt->ops->set_cr(ctxt, 0, cr0);
2712 return X86EMUL_CONTINUE;
2713}
2714
Avi Kivity26d05cc2011-04-21 12:07:59 +03002715static int em_vmcall(struct x86_emulate_ctxt *ctxt)
2716{
2717 struct decode_cache *c = &ctxt->decode;
2718 int rc;
2719
2720 if (c->modrm_mod != 3 || c->modrm_rm != 1)
2721 return X86EMUL_UNHANDLEABLE;
2722
2723 rc = ctxt->ops->fix_hypercall(ctxt);
2724 if (rc != X86EMUL_CONTINUE)
2725 return rc;
2726
2727 /* Let the processor re-execute the fixed hypercall */
2728 c->eip = ctxt->eip;
2729 /* Disable writeback. */
2730 c->dst.type = OP_NONE;
2731 return X86EMUL_CONTINUE;
2732}
2733
2734static int em_lgdt(struct x86_emulate_ctxt *ctxt)
2735{
2736 struct decode_cache *c = &ctxt->decode;
2737 struct desc_ptr desc_ptr;
2738 int rc;
2739
Takuya Yoshikawa509cf9f2011-05-02 02:25:07 +09002740 rc = read_descriptor(ctxt, c->src.addr.mem,
Avi Kivity26d05cc2011-04-21 12:07:59 +03002741 &desc_ptr.size, &desc_ptr.address,
2742 c->op_bytes);
2743 if (rc != X86EMUL_CONTINUE)
2744 return rc;
2745 ctxt->ops->set_gdt(ctxt, &desc_ptr);
2746 /* Disable writeback. */
2747 c->dst.type = OP_NONE;
2748 return X86EMUL_CONTINUE;
2749}
2750
Avi Kivity5ef39c72011-04-21 12:21:50 +03002751static int em_vmmcall(struct x86_emulate_ctxt *ctxt)
Avi Kivity26d05cc2011-04-21 12:07:59 +03002752{
2753 struct decode_cache *c = &ctxt->decode;
2754 int rc;
2755
Avi Kivity5ef39c72011-04-21 12:21:50 +03002756 rc = ctxt->ops->fix_hypercall(ctxt);
2757
Avi Kivity26d05cc2011-04-21 12:07:59 +03002758 /* Disable writeback. */
2759 c->dst.type = OP_NONE;
2760 return rc;
2761}
2762
2763static int em_lidt(struct x86_emulate_ctxt *ctxt)
2764{
2765 struct decode_cache *c = &ctxt->decode;
2766 struct desc_ptr desc_ptr;
2767 int rc;
2768
Takuya Yoshikawa509cf9f2011-05-02 02:25:07 +09002769 rc = read_descriptor(ctxt, c->src.addr.mem,
2770 &desc_ptr.size, &desc_ptr.address,
Avi Kivity26d05cc2011-04-21 12:07:59 +03002771 c->op_bytes);
2772 if (rc != X86EMUL_CONTINUE)
2773 return rc;
2774 ctxt->ops->set_idt(ctxt, &desc_ptr);
2775 /* Disable writeback. */
2776 c->dst.type = OP_NONE;
2777 return X86EMUL_CONTINUE;
2778}
2779
2780static int em_smsw(struct x86_emulate_ctxt *ctxt)
2781{
2782 struct decode_cache *c = &ctxt->decode;
2783
2784 c->dst.bytes = 2;
2785 c->dst.val = ctxt->ops->get_cr(ctxt, 0);
2786 return X86EMUL_CONTINUE;
2787}
2788
2789static int em_lmsw(struct x86_emulate_ctxt *ctxt)
2790{
2791 struct decode_cache *c = &ctxt->decode;
2792 ctxt->ops->set_cr(ctxt, 0, (ctxt->ops->get_cr(ctxt, 0) & ~0x0eul)
2793 | (c->src.val & 0x0f));
2794 c->dst.type = OP_NONE;
2795 return X86EMUL_CONTINUE;
2796}
2797
Joerg Roedelcfec82c2011-04-04 12:39:28 +02002798static bool valid_cr(int nr)
2799{
2800 switch (nr) {
2801 case 0:
2802 case 2 ... 4:
2803 case 8:
2804 return true;
2805 default:
2806 return false;
2807 }
2808}
2809
2810static int check_cr_read(struct x86_emulate_ctxt *ctxt)
2811{
2812 struct decode_cache *c = &ctxt->decode;
2813
2814 if (!valid_cr(c->modrm_reg))
2815 return emulate_ud(ctxt);
2816
2817 return X86EMUL_CONTINUE;
2818}
2819
2820static int check_cr_write(struct x86_emulate_ctxt *ctxt)
2821{
2822 struct decode_cache *c = &ctxt->decode;
2823 u64 new_val = c->src.val64;
2824 int cr = c->modrm_reg;
Avi Kivityc2ad2bb2011-04-20 15:21:35 +03002825 u64 efer = 0;
Joerg Roedelcfec82c2011-04-04 12:39:28 +02002826
2827 static u64 cr_reserved_bits[] = {
2828 0xffffffff00000000ULL,
2829 0, 0, 0, /* CR3 checked later */
2830 CR4_RESERVED_BITS,
2831 0, 0, 0,
2832 CR8_RESERVED_BITS,
2833 };
2834
2835 if (!valid_cr(cr))
2836 return emulate_ud(ctxt);
2837
2838 if (new_val & cr_reserved_bits[cr])
2839 return emulate_gp(ctxt, 0);
2840
2841 switch (cr) {
2842 case 0: {
Avi Kivityc2ad2bb2011-04-20 15:21:35 +03002843 u64 cr4;
Joerg Roedelcfec82c2011-04-04 12:39:28 +02002844 if (((new_val & X86_CR0_PG) && !(new_val & X86_CR0_PE)) ||
2845 ((new_val & X86_CR0_NW) && !(new_val & X86_CR0_CD)))
2846 return emulate_gp(ctxt, 0);
2847
Avi Kivity717746e2011-04-20 13:37:53 +03002848 cr4 = ctxt->ops->get_cr(ctxt, 4);
2849 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
Joerg Roedelcfec82c2011-04-04 12:39:28 +02002850
2851 if ((new_val & X86_CR0_PG) && (efer & EFER_LME) &&
2852 !(cr4 & X86_CR4_PAE))
2853 return emulate_gp(ctxt, 0);
2854
2855 break;
2856 }
2857 case 3: {
2858 u64 rsvd = 0;
2859
Avi Kivityc2ad2bb2011-04-20 15:21:35 +03002860 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
2861 if (efer & EFER_LMA)
Joerg Roedelcfec82c2011-04-04 12:39:28 +02002862 rsvd = CR3_L_MODE_RESERVED_BITS;
Avi Kivityfd72c412011-04-20 15:24:32 +03002863 else if (ctxt->ops->get_cr(ctxt, 4) & X86_CR4_PAE)
Joerg Roedelcfec82c2011-04-04 12:39:28 +02002864 rsvd = CR3_PAE_RESERVED_BITS;
Avi Kivityfd72c412011-04-20 15:24:32 +03002865 else if (ctxt->ops->get_cr(ctxt, 0) & X86_CR0_PG)
Joerg Roedelcfec82c2011-04-04 12:39:28 +02002866 rsvd = CR3_NONPAE_RESERVED_BITS;
2867
2868 if (new_val & rsvd)
2869 return emulate_gp(ctxt, 0);
2870
2871 break;
2872 }
2873 case 4: {
Avi Kivityc2ad2bb2011-04-20 15:21:35 +03002874 u64 cr4;
Joerg Roedelcfec82c2011-04-04 12:39:28 +02002875
Avi Kivity717746e2011-04-20 13:37:53 +03002876 cr4 = ctxt->ops->get_cr(ctxt, 4);
2877 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
Joerg Roedelcfec82c2011-04-04 12:39:28 +02002878
2879 if ((efer & EFER_LMA) && !(new_val & X86_CR4_PAE))
2880 return emulate_gp(ctxt, 0);
2881
2882 break;
2883 }
2884 }
2885
2886 return X86EMUL_CONTINUE;
2887}
2888
Joerg Roedel3b88e412011-04-04 12:39:29 +02002889static int check_dr7_gd(struct x86_emulate_ctxt *ctxt)
2890{
2891 unsigned long dr7;
2892
Avi Kivity717746e2011-04-20 13:37:53 +03002893 ctxt->ops->get_dr(ctxt, 7, &dr7);
Joerg Roedel3b88e412011-04-04 12:39:29 +02002894
2895 /* Check if DR7.Global_Enable is set */
2896 return dr7 & (1 << 13);
2897}
2898
2899static int check_dr_read(struct x86_emulate_ctxt *ctxt)
2900{
2901 struct decode_cache *c = &ctxt->decode;
2902 int dr = c->modrm_reg;
2903 u64 cr4;
2904
2905 if (dr > 7)
2906 return emulate_ud(ctxt);
2907
Avi Kivity717746e2011-04-20 13:37:53 +03002908 cr4 = ctxt->ops->get_cr(ctxt, 4);
Joerg Roedel3b88e412011-04-04 12:39:29 +02002909 if ((cr4 & X86_CR4_DE) && (dr == 4 || dr == 5))
2910 return emulate_ud(ctxt);
2911
2912 if (check_dr7_gd(ctxt))
2913 return emulate_db(ctxt);
2914
2915 return X86EMUL_CONTINUE;
2916}
2917
2918static int check_dr_write(struct x86_emulate_ctxt *ctxt)
2919{
2920 struct decode_cache *c = &ctxt->decode;
2921 u64 new_val = c->src.val64;
2922 int dr = c->modrm_reg;
2923
2924 if ((dr == 6 || dr == 7) && (new_val & 0xffffffff00000000ULL))
2925 return emulate_gp(ctxt, 0);
2926
2927 return check_dr_read(ctxt);
2928}
2929
Joerg Roedel01de8b02011-04-04 12:39:31 +02002930static int check_svme(struct x86_emulate_ctxt *ctxt)
2931{
2932 u64 efer;
2933
Avi Kivity717746e2011-04-20 13:37:53 +03002934 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
Joerg Roedel01de8b02011-04-04 12:39:31 +02002935
2936 if (!(efer & EFER_SVME))
2937 return emulate_ud(ctxt);
2938
2939 return X86EMUL_CONTINUE;
2940}
2941
2942static int check_svme_pa(struct x86_emulate_ctxt *ctxt)
2943{
Avi Kivityfe870ab2011-04-20 15:01:23 +03002944 u64 rax = ctxt->decode.regs[VCPU_REGS_RAX];
Joerg Roedel01de8b02011-04-04 12:39:31 +02002945
2946 /* Valid physical address? */
Randy Dunlapd4224442011-04-21 09:09:22 -07002947 if (rax & 0xffff000000000000ULL)
Joerg Roedel01de8b02011-04-04 12:39:31 +02002948 return emulate_gp(ctxt, 0);
2949
2950 return check_svme(ctxt);
2951}
2952
Joerg Roedeld7eb8202011-04-04 12:39:32 +02002953static int check_rdtsc(struct x86_emulate_ctxt *ctxt)
2954{
Avi Kivity717746e2011-04-20 13:37:53 +03002955 u64 cr4 = ctxt->ops->get_cr(ctxt, 4);
Joerg Roedeld7eb8202011-04-04 12:39:32 +02002956
Avi Kivity717746e2011-04-20 13:37:53 +03002957 if (cr4 & X86_CR4_TSD && ctxt->ops->cpl(ctxt))
Joerg Roedeld7eb8202011-04-04 12:39:32 +02002958 return emulate_ud(ctxt);
2959
2960 return X86EMUL_CONTINUE;
2961}
2962
Joerg Roedel80612522011-04-04 12:39:33 +02002963static int check_rdpmc(struct x86_emulate_ctxt *ctxt)
2964{
Avi Kivity717746e2011-04-20 13:37:53 +03002965 u64 cr4 = ctxt->ops->get_cr(ctxt, 4);
Avi Kivityfe870ab2011-04-20 15:01:23 +03002966 u64 rcx = ctxt->decode.regs[VCPU_REGS_RCX];
Joerg Roedel80612522011-04-04 12:39:33 +02002967
Avi Kivity717746e2011-04-20 13:37:53 +03002968 if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt)) ||
Joerg Roedel80612522011-04-04 12:39:33 +02002969 (rcx > 3))
2970 return emulate_gp(ctxt, 0);
2971
2972 return X86EMUL_CONTINUE;
2973}
2974
Joerg Roedelf6511932011-04-04 12:39:35 +02002975static int check_perm_in(struct x86_emulate_ctxt *ctxt)
2976{
2977 struct decode_cache *c = &ctxt->decode;
2978
2979 c->dst.bytes = min(c->dst.bytes, 4u);
2980 if (!emulator_io_permited(ctxt, ctxt->ops, c->src.val, c->dst.bytes))
2981 return emulate_gp(ctxt, 0);
2982
2983 return X86EMUL_CONTINUE;
2984}
2985
2986static int check_perm_out(struct x86_emulate_ctxt *ctxt)
2987{
2988 struct decode_cache *c = &ctxt->decode;
2989
2990 c->src.bytes = min(c->src.bytes, 4u);
2991 if (!emulator_io_permited(ctxt, ctxt->ops, c->dst.val, c->src.bytes))
2992 return emulate_gp(ctxt, 0);
2993
2994 return X86EMUL_CONTINUE;
2995}
2996
Avi Kivity73fba5f2010-07-29 15:11:53 +03002997#define D(_y) { .flags = (_y) }
Avi Kivityc4f035c2011-04-04 12:39:22 +02002998#define DI(_y, _i) { .flags = (_y), .intercept = x86_intercept_##_i }
Joerg Roedeld09beab2011-04-04 12:39:25 +02002999#define DIP(_y, _i, _p) { .flags = (_y), .intercept = x86_intercept_##_i, \
3000 .check_perm = (_p) }
Avi Kivity73fba5f2010-07-29 15:11:53 +03003001#define N D(0)
Joerg Roedel01de8b02011-04-04 12:39:31 +02003002#define EXT(_f, _e) { .flags = ((_f) | RMExt), .u.group = (_e) }
Avi Kivity73fba5f2010-07-29 15:11:53 +03003003#define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
Avi Kivity46561642011-04-24 14:09:59 +03003004#define GD(_f, _g) { .flags = ((_f) | GroupDual), .u.gdual = (_g) }
Avi Kivity73fba5f2010-07-29 15:11:53 +03003005#define I(_f, _e) { .flags = (_f), .u.execute = (_e) }
Avi Kivityc4f035c2011-04-04 12:39:22 +02003006#define II(_f, _e, _i) \
3007 { .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i }
Joerg Roedeld09beab2011-04-04 12:39:25 +02003008#define IIP(_f, _e, _i, _p) \
3009 { .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i, \
3010 .check_perm = (_p) }
Avi Kivityaa97bb42010-01-20 18:09:23 +02003011#define GP(_f, _g) { .flags = ((_f) | Prefix), .u.gprefix = (_g) }
Avi Kivity73fba5f2010-07-29 15:11:53 +03003012
Avi Kivity8d8f4e92010-08-26 11:56:06 +03003013#define D2bv(_f) D((_f) | ByteOp), D(_f)
Joerg Roedelf6511932011-04-04 12:39:35 +02003014#define D2bvIP(_f, _i, _p) DIP((_f) | ByteOp, _i, _p), DIP(_f, _i, _p)
Avi Kivity8d8f4e92010-08-26 11:56:06 +03003015#define I2bv(_f, _e) I((_f) | ByteOp, _e), I(_f, _e)
3016
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003017#define I6ALU(_f, _e) I2bv((_f) | DstMem | SrcReg | ModRM, _e), \
3018 I2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock, _e), \
3019 I2bv(((_f) & ~Lock) | DstAcc | SrcImm, _e)
Avi Kivity6230f7f2010-08-26 18:34:55 +03003020
Joerg Roedeld7eb8202011-04-04 12:39:32 +02003021static struct opcode group7_rm1[] = {
3022 DI(SrcNone | ModRM | Priv, monitor),
3023 DI(SrcNone | ModRM | Priv, mwait),
3024 N, N, N, N, N, N,
3025};
3026
Joerg Roedel01de8b02011-04-04 12:39:31 +02003027static struct opcode group7_rm3[] = {
3028 DIP(SrcNone | ModRM | Prot | Priv, vmrun, check_svme_pa),
Avi Kivity5ef39c72011-04-21 12:21:50 +03003029 II(SrcNone | ModRM | Prot | VendorSpecific, em_vmmcall, vmmcall),
Joerg Roedel01de8b02011-04-04 12:39:31 +02003030 DIP(SrcNone | ModRM | Prot | Priv, vmload, check_svme_pa),
3031 DIP(SrcNone | ModRM | Prot | Priv, vmsave, check_svme_pa),
3032 DIP(SrcNone | ModRM | Prot | Priv, stgi, check_svme),
3033 DIP(SrcNone | ModRM | Prot | Priv, clgi, check_svme),
3034 DIP(SrcNone | ModRM | Prot | Priv, skinit, check_svme),
3035 DIP(SrcNone | ModRM | Prot | Priv, invlpga, check_svme),
3036};
Avi Kivity6230f7f2010-08-26 18:34:55 +03003037
Joerg Roedeld7eb8202011-04-04 12:39:32 +02003038static struct opcode group7_rm7[] = {
3039 N,
3040 DIP(SrcNone | ModRM, rdtscp, check_rdtsc),
3041 N, N, N, N, N, N,
3042};
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003043
Avi Kivity73fba5f2010-07-29 15:11:53 +03003044static struct opcode group1[] = {
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003045 I(Lock, em_add),
3046 I(Lock, em_or),
3047 I(Lock, em_adc),
3048 I(Lock, em_sbb),
3049 I(Lock, em_and),
3050 I(Lock, em_sub),
3051 I(Lock, em_xor),
3052 I(0, em_cmp),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003053};
3054
3055static struct opcode group1A[] = {
3056 D(DstMem | SrcNone | ModRM | Mov | Stack), N, N, N, N, N, N, N,
3057};
3058
3059static struct opcode group3[] = {
3060 D(DstMem | SrcImm | ModRM), D(DstMem | SrcImm | ModRM),
3061 D(DstMem | SrcNone | ModRM | Lock), D(DstMem | SrcNone | ModRM | Lock),
Mohammed Gamal3f9f53b2010-08-08 21:11:37 +03003062 X4(D(SrcMem | ModRM)),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003063};
3064
3065static struct opcode group4[] = {
3066 D(ByteOp | DstMem | SrcNone | ModRM | Lock), D(ByteOp | DstMem | SrcNone | ModRM | Lock),
3067 N, N, N, N, N, N,
3068};
3069
3070static struct opcode group5[] = {
3071 D(DstMem | SrcNone | ModRM | Lock), D(DstMem | SrcNone | ModRM | Lock),
Avi Kivity0ef753b2010-08-18 14:51:45 +03003072 D(SrcMem | ModRM | Stack),
3073 I(SrcMemFAddr | ModRM | ImplicitOps | Stack, em_call_far),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003074 D(SrcMem | ModRM | Stack), D(SrcMemFAddr | ModRM | ImplicitOps),
3075 D(SrcMem | ModRM | Stack), N,
3076};
3077
Joerg Roedeldee6bb72011-04-04 12:39:30 +02003078static struct opcode group6[] = {
3079 DI(ModRM | Prot, sldt),
3080 DI(ModRM | Prot, str),
3081 DI(ModRM | Prot | Priv, lldt),
3082 DI(ModRM | Prot | Priv, ltr),
3083 N, N, N, N,
3084};
3085
Avi Kivity73fba5f2010-07-29 15:11:53 +03003086static struct group_dual group7 = { {
Joerg Roedeldee6bb72011-04-04 12:39:30 +02003087 DI(ModRM | Mov | DstMem | Priv, sgdt),
3088 DI(ModRM | Mov | DstMem | Priv, sidt),
Avi Kivity5ef39c72011-04-21 12:21:50 +03003089 II(ModRM | SrcMem | Priv, em_lgdt, lgdt),
3090 II(ModRM | SrcMem | Priv, em_lidt, lidt),
3091 II(SrcNone | ModRM | DstMem | Mov, em_smsw, smsw), N,
3092 II(SrcMem16 | ModRM | Mov | Priv, em_lmsw, lmsw),
3093 II(SrcMem | ModRM | ByteOp | Priv | NoAccess, em_invlpg, invlpg),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003094}, {
Avi Kivity5ef39c72011-04-21 12:21:50 +03003095 I(SrcNone | ModRM | Priv | VendorSpecific, em_vmcall),
3096 EXT(0, group7_rm1),
Joerg Roedel01de8b02011-04-04 12:39:31 +02003097 N, EXT(0, group7_rm3),
Avi Kivity5ef39c72011-04-21 12:21:50 +03003098 II(SrcNone | ModRM | DstMem | Mov, em_smsw, smsw), N,
3099 II(SrcMem16 | ModRM | Mov | Priv, em_lmsw, lmsw), EXT(0, group7_rm7),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003100} };
3101
3102static struct opcode group8[] = {
3103 N, N, N, N,
3104 D(DstMem | SrcImmByte | ModRM), D(DstMem | SrcImmByte | ModRM | Lock),
3105 D(DstMem | SrcImmByte | ModRM | Lock), D(DstMem | SrcImmByte | ModRM | Lock),
3106};
3107
3108static struct group_dual group9 = { {
3109 N, D(DstMem64 | ModRM | Lock), N, N, N, N, N, N,
3110}, {
3111 N, N, N, N, N, N, N, N,
3112} };
3113
Avi Kivitya4d4a7c2010-08-03 15:05:46 +03003114static struct opcode group11[] = {
3115 I(DstMem | SrcImm | ModRM | Mov, em_mov), X7(D(Undefined)),
3116};
3117
Avi Kivityaa97bb42010-01-20 18:09:23 +02003118static struct gprefix pfx_0f_6f_0f_7f = {
3119 N, N, N, I(Sse, em_movdqu),
3120};
3121
Avi Kivity73fba5f2010-07-29 15:11:53 +03003122static struct opcode opcode_table[256] = {
3123 /* 0x00 - 0x07 */
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003124 I6ALU(Lock, em_add),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003125 D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
3126 /* 0x08 - 0x0F */
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003127 I6ALU(Lock, em_or),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003128 D(ImplicitOps | Stack | No64), N,
3129 /* 0x10 - 0x17 */
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003130 I6ALU(Lock, em_adc),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003131 D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
3132 /* 0x18 - 0x1F */
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003133 I6ALU(Lock, em_sbb),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003134 D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
3135 /* 0x20 - 0x27 */
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003136 I6ALU(Lock, em_and), N, N,
Avi Kivity73fba5f2010-07-29 15:11:53 +03003137 /* 0x28 - 0x2F */
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003138 I6ALU(Lock, em_sub), N, I(ByteOp | DstAcc | No64, em_das),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003139 /* 0x30 - 0x37 */
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003140 I6ALU(Lock, em_xor), N, N,
Avi Kivity73fba5f2010-07-29 15:11:53 +03003141 /* 0x38 - 0x3F */
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003142 I6ALU(0, em_cmp), N, N,
Avi Kivity73fba5f2010-07-29 15:11:53 +03003143 /* 0x40 - 0x4F */
3144 X16(D(DstReg)),
3145 /* 0x50 - 0x57 */
Avi Kivity63540382010-07-29 15:11:55 +03003146 X8(I(SrcReg | Stack, em_push)),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003147 /* 0x58 - 0x5F */
Takuya Yoshikawac54fe502011-04-23 18:49:40 +09003148 X8(I(DstReg | Stack, em_pop)),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003149 /* 0x60 - 0x67 */
Takuya Yoshikawab96a7fa2011-04-23 18:51:07 +09003150 I(ImplicitOps | Stack | No64, em_pusha),
3151 I(ImplicitOps | Stack | No64, em_popa),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003152 N, D(DstReg | SrcMem32 | ModRM | Mov) /* movsxd (x86/64) */ ,
3153 N, N, N, N,
3154 /* 0x68 - 0x6F */
Avi Kivityd46164d2010-08-18 19:29:33 +03003155 I(SrcImm | Mov | Stack, em_push),
3156 I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op),
Avi Kivityf3a1b9f2010-08-18 18:25:25 +03003157 I(SrcImmByte | Mov | Stack, em_push),
3158 I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op),
Marcelo Tosatti221192b2011-05-30 15:23:14 -03003159 D2bvIP(DstDI | SrcDX | Mov | String, ins, check_perm_in), /* insb, insw/insd */
3160 D2bvIP(SrcSI | DstDX | String, outs, check_perm_out), /* outsb, outsw/outsd */
Avi Kivity73fba5f2010-07-29 15:11:53 +03003161 /* 0x70 - 0x7F */
3162 X16(D(SrcImmByte)),
3163 /* 0x80 - 0x87 */
3164 G(ByteOp | DstMem | SrcImm | ModRM | Group, group1),
3165 G(DstMem | SrcImm | ModRM | Group, group1),
3166 G(ByteOp | DstMem | SrcImm | ModRM | No64 | Group, group1),
3167 G(DstMem | SrcImmByte | ModRM | Group, group1),
Avi Kivity76e8e682010-08-26 11:56:09 +03003168 D2bv(DstMem | SrcReg | ModRM), D2bv(DstMem | SrcReg | ModRM | Lock),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003169 /* 0x88 - 0x8F */
Avi Kivityb9eac5f2010-08-03 14:46:56 +03003170 I2bv(DstMem | SrcReg | ModRM | Mov, em_mov),
3171 I2bv(DstReg | SrcMem | ModRM | Mov, em_mov),
Avi Kivity342fc632010-08-01 15:13:22 +03003172 D(DstMem | SrcNone | ModRM | Mov), D(ModRM | SrcMem | NoAccess | DstReg),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003173 D(ImplicitOps | SrcMem16 | ModRM), G(0, group1A),
3174 /* 0x90 - 0x97 */
Joerg Roedelbf608f82011-04-04 12:39:34 +02003175 DI(SrcAcc | DstReg, pause), X7(D(SrcAcc | DstReg)),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003176 /* 0x98 - 0x9F */
Avi Kivity61429142010-08-19 15:13:00 +03003177 D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd),
Wei Yongjuncc4feed2010-08-25 14:10:53 +08003178 I(SrcImmFAddr | No64, em_call_far), N,
Takuya Yoshikawa62aaa2f2011-04-23 18:52:56 +09003179 II(ImplicitOps | Stack, em_pushf, pushf),
3180 II(ImplicitOps | Stack, em_popf, popf), N, N,
Avi Kivity73fba5f2010-07-29 15:11:53 +03003181 /* 0xA0 - 0xA7 */
Avi Kivityb9eac5f2010-08-03 14:46:56 +03003182 I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),
3183 I2bv(DstMem | SrcAcc | Mov | MemAbs, em_mov),
3184 I2bv(SrcSI | DstDI | Mov | String, em_mov),
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003185 I2bv(SrcSI | DstDI | String, em_cmp),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003186 /* 0xA8 - 0xAF */
Avi Kivity50748612010-08-26 11:56:10 +03003187 D2bv(DstAcc | SrcImm),
Avi Kivityb9eac5f2010-08-03 14:46:56 +03003188 I2bv(SrcAcc | DstDI | Mov | String, em_mov),
3189 I2bv(SrcSI | DstAcc | Mov | String, em_mov),
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003190 I2bv(SrcAcc | DstDI | String, em_cmp),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003191 /* 0xB0 - 0xB7 */
Avi Kivityb9eac5f2010-08-03 14:46:56 +03003192 X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003193 /* 0xB8 - 0xBF */
Avi Kivityb9eac5f2010-08-03 14:46:56 +03003194 X8(I(DstReg | SrcImm | Mov, em_mov)),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003195 /* 0xC0 - 0xC7 */
Avi Kivityd2c6c7a2010-08-26 11:56:11 +03003196 D2bv(DstMem | SrcImmByte | ModRM),
Avi Kivity40ece7c2010-08-18 15:12:09 +03003197 I(ImplicitOps | Stack | SrcImmU16, em_ret_near_imm),
3198 D(ImplicitOps | Stack),
Wei Yongjun09b5f4d2010-08-23 14:56:54 +08003199 D(DstReg | SrcMemFAddr | ModRM | No64), D(DstReg | SrcMemFAddr | ModRM | No64),
Avi Kivitya4d4a7c2010-08-03 15:05:46 +03003200 G(ByteOp, group11), G(0, group11),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003201 /* 0xC8 - 0xCF */
3202 N, N, N, D(ImplicitOps | Stack),
Avi Kivity3c6e2762011-04-04 12:39:23 +02003203 D(ImplicitOps), DI(SrcImmByte, intn),
3204 D(ImplicitOps | No64), DI(ImplicitOps, iret),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003205 /* 0xD0 - 0xD7 */
Avi Kivityd2c6c7a2010-08-26 11:56:11 +03003206 D2bv(DstMem | SrcOne | ModRM), D2bv(DstMem | ModRM),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003207 N, N, N, N,
3208 /* 0xD8 - 0xDF */
3209 N, N, N, N, N, N, N, N,
3210 /* 0xE0 - 0xE7 */
Wei Yongjune4abac62010-08-19 14:25:48 +08003211 X4(D(SrcImmByte)),
Joerg Roedelf6511932011-04-04 12:39:35 +02003212 D2bvIP(SrcImmUByte | DstAcc, in, check_perm_in),
3213 D2bvIP(SrcAcc | DstImmUByte, out, check_perm_out),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003214 /* 0xE8 - 0xEF */
3215 D(SrcImm | Stack), D(SrcImm | ImplicitOps),
3216 D(SrcImmFAddr | No64), D(SrcImmByte | ImplicitOps),
Marcelo Tosatti221192b2011-05-30 15:23:14 -03003217 D2bvIP(SrcDX | DstAcc, in, check_perm_in),
3218 D2bvIP(SrcAcc | DstDX, out, check_perm_out),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003219 /* 0xF0 - 0xF7 */
Joerg Roedelbf608f82011-04-04 12:39:34 +02003220 N, DI(ImplicitOps, icebp), N, N,
Avi Kivity3c6e2762011-04-04 12:39:23 +02003221 DI(ImplicitOps | Priv, hlt), D(ImplicitOps),
3222 G(ByteOp, group3), G(0, group3),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003223 /* 0xF8 - 0xFF */
Mohammed Gamal8744aa92010-08-05 15:42:49 +03003224 D(ImplicitOps), D(ImplicitOps), D(ImplicitOps), D(ImplicitOps),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003225 D(ImplicitOps), D(ImplicitOps), G(0, group4), G(0, group5),
3226};
3227
3228static struct opcode twobyte_table[256] = {
3229 /* 0x00 - 0x0F */
Joerg Roedeldee6bb72011-04-04 12:39:30 +02003230 G(0, group6), GD(0, &group7), N, N,
Joerg Roedelcfec82c2011-04-04 12:39:28 +02003231 N, D(ImplicitOps | VendorSpecific), DI(ImplicitOps | Priv, clts), N,
Avi Kivity3c6e2762011-04-04 12:39:23 +02003232 DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N,
Avi Kivity73fba5f2010-07-29 15:11:53 +03003233 N, D(ImplicitOps | ModRM), N, N,
3234 /* 0x10 - 0x1F */
3235 N, N, N, N, N, N, N, N, D(ImplicitOps | ModRM), N, N, N, N, N, N, N,
3236 /* 0x20 - 0x2F */
Joerg Roedelcfec82c2011-04-04 12:39:28 +02003237 DIP(ModRM | DstMem | Priv | Op3264, cr_read, check_cr_read),
Joerg Roedel3b88e412011-04-04 12:39:29 +02003238 DIP(ModRM | DstMem | Priv | Op3264, dr_read, check_dr_read),
Joerg Roedelcfec82c2011-04-04 12:39:28 +02003239 DIP(ModRM | SrcMem | Priv | Op3264, cr_write, check_cr_write),
Joerg Roedel3b88e412011-04-04 12:39:29 +02003240 DIP(ModRM | SrcMem | Priv | Op3264, dr_write, check_dr_write),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003241 N, N, N, N,
3242 N, N, N, N, N, N, N, N,
3243 /* 0x30 - 0x3F */
Joerg Roedel80612522011-04-04 12:39:33 +02003244 DI(ImplicitOps | Priv, wrmsr),
3245 IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc),
3246 DI(ImplicitOps | Priv, rdmsr),
3247 DIP(ImplicitOps | Priv, rdpmc, check_rdpmc),
Avi Kivityd8671622011-02-01 16:32:03 +02003248 D(ImplicitOps | VendorSpecific), D(ImplicitOps | Priv | VendorSpecific),
3249 N, N,
Avi Kivity73fba5f2010-07-29 15:11:53 +03003250 N, N, N, N, N, N, N, N,
3251 /* 0x40 - 0x4F */
3252 X16(D(DstReg | SrcMem | ModRM | Mov)),
3253 /* 0x50 - 0x5F */
3254 N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
3255 /* 0x60 - 0x6F */
Avi Kivityaa97bb42010-01-20 18:09:23 +02003256 N, N, N, N,
3257 N, N, N, N,
3258 N, N, N, N,
3259 N, N, N, GP(SrcMem | DstReg | ModRM | Mov, &pfx_0f_6f_0f_7f),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003260 /* 0x70 - 0x7F */
Avi Kivityaa97bb42010-01-20 18:09:23 +02003261 N, N, N, N,
3262 N, N, N, N,
3263 N, N, N, N,
3264 N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003265 /* 0x80 - 0x8F */
3266 X16(D(SrcImm)),
3267 /* 0x90 - 0x9F */
Wei Yongjunee45b582010-08-06 17:10:07 +08003268 X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003269 /* 0xA0 - 0xA7 */
3270 D(ImplicitOps | Stack), D(ImplicitOps | Stack),
Joerg Roedel80612522011-04-04 12:39:33 +02003271 DI(ImplicitOps, cpuid), D(DstMem | SrcReg | ModRM | BitOp),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003272 D(DstMem | SrcReg | Src2ImmByte | ModRM),
3273 D(DstMem | SrcReg | Src2CL | ModRM), N, N,
3274 /* 0xA8 - 0xAF */
3275 D(ImplicitOps | Stack), D(ImplicitOps | Stack),
Joerg Roedel80612522011-04-04 12:39:33 +02003276 DI(ImplicitOps, rsm), D(DstMem | SrcReg | ModRM | BitOp | Lock),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003277 D(DstMem | SrcReg | Src2ImmByte | ModRM),
3278 D(DstMem | SrcReg | Src2CL | ModRM),
Avi Kivity5c82aa22010-08-18 18:31:43 +03003279 D(ModRM), I(DstReg | SrcMem | ModRM, em_imul),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003280 /* 0xB0 - 0xB7 */
Avi Kivity739ae402010-08-26 11:56:13 +03003281 D2bv(DstMem | SrcReg | ModRM | Lock),
Wei Yongjun09b5f4d2010-08-23 14:56:54 +08003282 D(DstReg | SrcMemFAddr | ModRM), D(DstMem | SrcReg | ModRM | BitOp | Lock),
3283 D(DstReg | SrcMemFAddr | ModRM), D(DstReg | SrcMemFAddr | ModRM),
3284 D(ByteOp | DstReg | SrcMem | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003285 /* 0xB8 - 0xBF */
3286 N, N,
Wei Yongjunba7ff2b2010-08-09 11:39:14 +08003287 G(BitOp, group8), D(DstMem | SrcReg | ModRM | BitOp | Lock),
Wei Yongjund9574a22010-08-10 13:48:22 +08003288 D(DstReg | SrcMem | ModRM), D(DstReg | SrcMem | ModRM),
3289 D(ByteOp | DstReg | SrcMem | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003290 /* 0xC0 - 0xCF */
Avi Kivity739ae402010-08-26 11:56:13 +03003291 D2bv(DstMem | SrcReg | ModRM | Lock),
Wei Yongjun92f738a2010-08-17 09:19:34 +08003292 N, D(DstMem | SrcReg | ModRM | Mov),
Avi Kivity73fba5f2010-07-29 15:11:53 +03003293 N, N, N, GD(0, &group9),
3294 N, N, N, N, N, N, N, N,
3295 /* 0xD0 - 0xDF */
3296 N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
3297 /* 0xE0 - 0xEF */
3298 N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
3299 /* 0xF0 - 0xFF */
3300 N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N
3301};
3302
3303#undef D
3304#undef N
3305#undef G
3306#undef GD
3307#undef I
Avi Kivityaa97bb42010-01-20 18:09:23 +02003308#undef GP
Joerg Roedel01de8b02011-04-04 12:39:31 +02003309#undef EXT
Avi Kivity73fba5f2010-07-29 15:11:53 +03003310
Avi Kivity8d8f4e92010-08-26 11:56:06 +03003311#undef D2bv
Joerg Roedelf6511932011-04-04 12:39:35 +02003312#undef D2bvIP
Avi Kivity8d8f4e92010-08-26 11:56:06 +03003313#undef I2bv
Takuya Yoshikawad67fc272011-04-23 18:48:02 +09003314#undef I6ALU
Avi Kivity8d8f4e92010-08-26 11:56:06 +03003315
Avi Kivity39f21ee2010-08-18 19:20:21 +03003316static unsigned imm_size(struct decode_cache *c)
3317{
3318 unsigned size;
3319
3320 size = (c->d & ByteOp) ? 1 : c->op_bytes;
3321 if (size == 8)
3322 size = 4;
3323 return size;
3324}
3325
3326static int decode_imm(struct x86_emulate_ctxt *ctxt, struct operand *op,
3327 unsigned size, bool sign_extension)
3328{
3329 struct decode_cache *c = &ctxt->decode;
3330 struct x86_emulate_ops *ops = ctxt->ops;
3331 int rc = X86EMUL_CONTINUE;
3332
3333 op->type = OP_IMM;
3334 op->bytes = size;
Avi Kivity90de84f2010-11-17 15:28:21 +02003335 op->addr.mem.ea = c->eip;
Avi Kivity39f21ee2010-08-18 19:20:21 +03003336 /* NB. Immediates are sign-extended as necessary. */
3337 switch (op->bytes) {
3338 case 1:
3339 op->val = insn_fetch(s8, 1, c->eip);
3340 break;
3341 case 2:
3342 op->val = insn_fetch(s16, 2, c->eip);
3343 break;
3344 case 4:
3345 op->val = insn_fetch(s32, 4, c->eip);
3346 break;
3347 }
3348 if (!sign_extension) {
3349 switch (op->bytes) {
3350 case 1:
3351 op->val &= 0xff;
3352 break;
3353 case 2:
3354 op->val &= 0xffff;
3355 break;
3356 case 4:
3357 op->val &= 0xffffffff;
3358 break;
3359 }
3360 }
3361done:
3362 return rc;
3363}
3364
Laurent Vivier8b4caf62007-09-18 11:27:19 +02003365int
Andre Przywaradc25e892010-12-21 11:12:07 +01003366x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003367{
3368 struct x86_emulate_ops *ops = ctxt->ops;
3369 struct decode_cache *c = &ctxt->decode;
3370 int rc = X86EMUL_CONTINUE;
3371 int mode = ctxt->mode;
Avi Kivity46561642011-04-24 14:09:59 +03003372 int def_op_bytes, def_ad_bytes, goffset, simd_prefix;
Avi Kivity0d7cdee2011-03-29 11:34:38 +02003373 bool op_prefix = false;
Avi Kivity46561642011-04-24 14:09:59 +03003374 struct opcode opcode;
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03003375 struct operand memop = { .type = OP_NONE };
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003376
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003377 c->eip = ctxt->eip;
Andre Przywaradc25e892010-12-21 11:12:07 +01003378 c->fetch.start = c->eip;
3379 c->fetch.end = c->fetch.start + insn_len;
3380 if (insn_len > 0)
3381 memcpy(c->fetch.data, insn, insn_len);
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003382
3383 switch (mode) {
3384 case X86EMUL_MODE_REAL:
3385 case X86EMUL_MODE_VM86:
3386 case X86EMUL_MODE_PROT16:
3387 def_op_bytes = def_ad_bytes = 2;
3388 break;
3389 case X86EMUL_MODE_PROT32:
3390 def_op_bytes = def_ad_bytes = 4;
3391 break;
3392#ifdef CONFIG_X86_64
3393 case X86EMUL_MODE_PROT64:
3394 def_op_bytes = 4;
3395 def_ad_bytes = 8;
3396 break;
3397#endif
3398 default:
3399 return -1;
3400 }
3401
3402 c->op_bytes = def_op_bytes;
3403 c->ad_bytes = def_ad_bytes;
3404
3405 /* Legacy prefixes. */
3406 for (;;) {
3407 switch (c->b = insn_fetch(u8, 1, c->eip)) {
3408 case 0x66: /* operand-size override */
Avi Kivity0d7cdee2011-03-29 11:34:38 +02003409 op_prefix = true;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003410 /* switch between 2/4 bytes */
3411 c->op_bytes = def_op_bytes ^ 6;
3412 break;
3413 case 0x67: /* address-size override */
3414 if (mode == X86EMUL_MODE_PROT64)
3415 /* switch between 4/8 bytes */
3416 c->ad_bytes = def_ad_bytes ^ 12;
3417 else
3418 /* switch between 2/4 bytes */
3419 c->ad_bytes = def_ad_bytes ^ 6;
3420 break;
3421 case 0x26: /* ES override */
3422 case 0x2e: /* CS override */
3423 case 0x36: /* SS override */
3424 case 0x3e: /* DS override */
3425 set_seg_override(c, (c->b >> 3) & 3);
3426 break;
3427 case 0x64: /* FS override */
3428 case 0x65: /* GS override */
3429 set_seg_override(c, c->b & 7);
3430 break;
3431 case 0x40 ... 0x4f: /* REX */
3432 if (mode != X86EMUL_MODE_PROT64)
3433 goto done_prefixes;
3434 c->rex_prefix = c->b;
3435 continue;
3436 case 0xf0: /* LOCK */
3437 c->lock_prefix = 1;
3438 break;
3439 case 0xf2: /* REPNE/REPNZ */
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003440 case 0xf3: /* REP/REPE/REPZ */
Avi Kivity1d6b1142010-01-20 16:00:35 +02003441 c->rep_prefix = c->b;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003442 break;
3443 default:
3444 goto done_prefixes;
3445 }
3446
3447 /* Any legacy prefix after a REX prefix nullifies its effect. */
3448
3449 c->rex_prefix = 0;
3450 }
3451
3452done_prefixes:
3453
3454 /* REX prefix. */
Avi Kivity1e87e3e2010-08-01 14:42:51 +03003455 if (c->rex_prefix & 8)
3456 c->op_bytes = 8; /* REX.W */
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003457
3458 /* Opcode byte(s). */
3459 opcode = opcode_table[c->b];
Wei Yongjund3ad6242010-08-05 16:34:39 +08003460 /* Two-byte opcode? */
3461 if (c->b == 0x0f) {
3462 c->twobyte = 1;
3463 c->b = insn_fetch(u8, 1, c->eip);
3464 opcode = twobyte_table[c->b];
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003465 }
3466 c->d = opcode.flags;
3467
Avi Kivity46561642011-04-24 14:09:59 +03003468 while (c->d & GroupMask) {
3469 switch (c->d & GroupMask) {
3470 case Group:
3471 c->modrm = insn_fetch(u8, 1, c->eip);
3472 --c->eip;
3473 goffset = (c->modrm >> 3) & 7;
3474 opcode = opcode.u.group[goffset];
3475 break;
3476 case GroupDual:
3477 c->modrm = insn_fetch(u8, 1, c->eip);
3478 --c->eip;
3479 goffset = (c->modrm >> 3) & 7;
3480 if ((c->modrm >> 6) == 3)
3481 opcode = opcode.u.gdual->mod3[goffset];
3482 else
3483 opcode = opcode.u.gdual->mod012[goffset];
3484 break;
3485 case RMExt:
Joerg Roedel01de8b02011-04-04 12:39:31 +02003486 goffset = c->modrm & 7;
3487 opcode = opcode.u.group[goffset];
Avi Kivity46561642011-04-24 14:09:59 +03003488 break;
3489 case Prefix:
3490 if (c->rep_prefix && op_prefix)
3491 return X86EMUL_UNHANDLEABLE;
3492 simd_prefix = op_prefix ? 0x66 : c->rep_prefix;
3493 switch (simd_prefix) {
3494 case 0x00: opcode = opcode.u.gprefix->pfx_no; break;
3495 case 0x66: opcode = opcode.u.gprefix->pfx_66; break;
3496 case 0xf2: opcode = opcode.u.gprefix->pfx_f2; break;
3497 case 0xf3: opcode = opcode.u.gprefix->pfx_f3; break;
3498 }
3499 break;
3500 default:
Avi Kivity0d7cdee2011-03-29 11:34:38 +02003501 return X86EMUL_UNHANDLEABLE;
Avi Kivity0d7cdee2011-03-29 11:34:38 +02003502 }
Avi Kivity46561642011-04-24 14:09:59 +03003503
3504 c->d &= ~GroupMask;
Avi Kivity0d7cdee2011-03-29 11:34:38 +02003505 c->d |= opcode.flags;
3506 }
3507
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003508 c->execute = opcode.u.execute;
Joerg Roedeld09beab2011-04-04 12:39:25 +02003509 c->check_perm = opcode.check_perm;
Avi Kivityc4f035c2011-04-04 12:39:22 +02003510 c->intercept = opcode.intercept;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003511
3512 /* Unrecognised? */
Avi Kivityd53db5e2010-11-17 13:40:51 +02003513 if (c->d == 0 || (c->d & Undefined))
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003514 return -1;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003515
Avi Kivityd8671622011-02-01 16:32:03 +02003516 if (!(c->d & VendorSpecific) && ctxt->only_vendor_specific_insn)
3517 return -1;
3518
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003519 if (mode == X86EMUL_MODE_PROT64 && (c->d & Stack))
3520 c->op_bytes = 8;
3521
Avi Kivity7f9b4b72010-08-01 14:46:54 +03003522 if (c->d & Op3264) {
3523 if (mode == X86EMUL_MODE_PROT64)
3524 c->op_bytes = 8;
3525 else
3526 c->op_bytes = 4;
3527 }
3528
Avi Kivity12537912011-03-29 11:41:27 +02003529 if (c->d & Sse)
3530 c->op_bytes = 16;
3531
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003532 /* ModRM and SIB bytes. */
Avi Kivity09ee57c2010-08-01 12:07:29 +03003533 if (c->d & ModRM) {
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03003534 rc = decode_modrm(ctxt, ops, &memop);
Avi Kivity09ee57c2010-08-01 12:07:29 +03003535 if (!c->has_seg_override)
3536 set_seg_override(c, c->modrm_seg);
3537 } else if (c->d & MemAbs)
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03003538 rc = decode_abs(ctxt, ops, &memop);
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003539 if (rc != X86EMUL_CONTINUE)
3540 goto done;
3541
3542 if (!c->has_seg_override)
3543 set_seg_override(c, VCPU_SREG_DS);
3544
Takuya Yoshikawac1ed6de2011-05-02 02:23:13 +09003545 memop.addr.mem.seg = seg_override(ctxt, c);
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003546
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03003547 if (memop.type == OP_MEM && c->ad_bytes != 8)
Avi Kivity90de84f2010-11-17 15:28:21 +02003548 memop.addr.mem.ea = (u32)memop.addr.mem.ea;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003549
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03003550 if (memop.type == OP_MEM && c->rip_relative)
Avi Kivity90de84f2010-11-17 15:28:21 +02003551 memop.addr.mem.ea += c->eip;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003552
3553 /*
3554 * Decode and fetch the source operand: register, memory
3555 * or immediate.
3556 */
3557 switch (c->d & SrcMask) {
3558 case SrcNone:
3559 break;
3560 case SrcReg:
Avi Kivity12537912011-03-29 11:41:27 +02003561 decode_register_operand(ctxt, &c->src, c, 0);
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003562 break;
3563 case SrcMem16:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03003564 memop.bytes = 2;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003565 goto srcmem_common;
3566 case SrcMem32:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03003567 memop.bytes = 4;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003568 goto srcmem_common;
3569 case SrcMem:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03003570 memop.bytes = (c->d & ByteOp) ? 1 :
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003571 c->op_bytes;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003572 srcmem_common:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03003573 c->src = memop;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003574 break;
Avi Kivityb250e602010-08-18 15:11:24 +03003575 case SrcImmU16:
Avi Kivity39f21ee2010-08-18 19:20:21 +03003576 rc = decode_imm(ctxt, &c->src, 2, false);
3577 break;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003578 case SrcImm:
Avi Kivity39f21ee2010-08-18 19:20:21 +03003579 rc = decode_imm(ctxt, &c->src, imm_size(c), true);
3580 break;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003581 case SrcImmU:
Avi Kivity39f21ee2010-08-18 19:20:21 +03003582 rc = decode_imm(ctxt, &c->src, imm_size(c), false);
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003583 break;
3584 case SrcImmByte:
Avi Kivity39f21ee2010-08-18 19:20:21 +03003585 rc = decode_imm(ctxt, &c->src, 1, true);
3586 break;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003587 case SrcImmUByte:
Avi Kivity39f21ee2010-08-18 19:20:21 +03003588 rc = decode_imm(ctxt, &c->src, 1, false);
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003589 break;
3590 case SrcAcc:
3591 c->src.type = OP_REG;
3592 c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
Avi Kivity1a6440a2010-08-01 12:35:10 +03003593 c->src.addr.reg = &c->regs[VCPU_REGS_RAX];
Avi Kivity91ff3cb2010-08-01 12:53:09 +03003594 fetch_register_operand(&c->src);
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003595 break;
3596 case SrcOne:
3597 c->src.bytes = 1;
3598 c->src.val = 1;
3599 break;
3600 case SrcSI:
3601 c->src.type = OP_MEM;
3602 c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
Avi Kivity90de84f2010-11-17 15:28:21 +02003603 c->src.addr.mem.ea =
3604 register_address(c, c->regs[VCPU_REGS_RSI]);
Takuya Yoshikawac1ed6de2011-05-02 02:23:13 +09003605 c->src.addr.mem.seg = seg_override(ctxt, c);
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003606 c->src.val = 0;
3607 break;
3608 case SrcImmFAddr:
3609 c->src.type = OP_IMM;
Avi Kivity90de84f2010-11-17 15:28:21 +02003610 c->src.addr.mem.ea = c->eip;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003611 c->src.bytes = c->op_bytes + 2;
3612 insn_fetch_arr(c->src.valptr, c->src.bytes, c->eip);
3613 break;
3614 case SrcMemFAddr:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03003615 memop.bytes = c->op_bytes + 2;
3616 goto srcmem_common;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003617 break;
Marcelo Tosatti221192b2011-05-30 15:23:14 -03003618 case SrcDX:
3619 c->src.type = OP_REG;
3620 c->src.bytes = 2;
3621 c->src.addr.reg = &c->regs[VCPU_REGS_RDX];
3622 fetch_register_operand(&c->src);
3623 break;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003624 }
3625
Avi Kivity39f21ee2010-08-18 19:20:21 +03003626 if (rc != X86EMUL_CONTINUE)
3627 goto done;
3628
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003629 /*
3630 * Decode and fetch the second source operand: register, memory
3631 * or immediate.
3632 */
3633 switch (c->d & Src2Mask) {
3634 case Src2None:
3635 break;
3636 case Src2CL:
3637 c->src2.bytes = 1;
3638 c->src2.val = c->regs[VCPU_REGS_RCX] & 0x8;
3639 break;
3640 case Src2ImmByte:
Avi Kivity39f21ee2010-08-18 19:20:21 +03003641 rc = decode_imm(ctxt, &c->src2, 1, true);
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003642 break;
3643 case Src2One:
3644 c->src2.bytes = 1;
3645 c->src2.val = 1;
3646 break;
Avi Kivity7db41eb2010-08-18 19:25:28 +03003647 case Src2Imm:
3648 rc = decode_imm(ctxt, &c->src2, imm_size(c), true);
3649 break;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003650 }
3651
Avi Kivity39f21ee2010-08-18 19:20:21 +03003652 if (rc != X86EMUL_CONTINUE)
3653 goto done;
3654
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003655 /* Decode and fetch the destination operand: register or memory. */
3656 switch (c->d & DstMask) {
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003657 case DstReg:
Avi Kivity12537912011-03-29 11:41:27 +02003658 decode_register_operand(ctxt, &c->dst, c,
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003659 c->twobyte && (c->b == 0xb6 || c->b == 0xb7));
3660 break;
Wei Yongjun943858e2010-08-06 11:36:51 +08003661 case DstImmUByte:
3662 c->dst.type = OP_IMM;
Avi Kivity90de84f2010-11-17 15:28:21 +02003663 c->dst.addr.mem.ea = c->eip;
Wei Yongjun943858e2010-08-06 11:36:51 +08003664 c->dst.bytes = 1;
3665 c->dst.val = insn_fetch(u8, 1, c->eip);
3666 break;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003667 case DstMem:
3668 case DstMem64:
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03003669 c->dst = memop;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003670 if ((c->d & DstMask) == DstMem64)
3671 c->dst.bytes = 8;
3672 else
3673 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
Wei Yongjun35c843c2010-08-09 11:34:56 +08003674 if (c->d & BitOp)
3675 fetch_bit_operand(c);
Avi Kivity2dbd0dd2010-08-01 15:40:19 +03003676 c->dst.orig_val = c->dst.val;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003677 break;
3678 case DstAcc:
3679 c->dst.type = OP_REG;
3680 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
Avi Kivity1a6440a2010-08-01 12:35:10 +03003681 c->dst.addr.reg = &c->regs[VCPU_REGS_RAX];
Avi Kivity91ff3cb2010-08-01 12:53:09 +03003682 fetch_register_operand(&c->dst);
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003683 c->dst.orig_val = c->dst.val;
3684 break;
3685 case DstDI:
3686 c->dst.type = OP_MEM;
3687 c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
Avi Kivity90de84f2010-11-17 15:28:21 +02003688 c->dst.addr.mem.ea =
3689 register_address(c, c->regs[VCPU_REGS_RDI]);
3690 c->dst.addr.mem.seg = VCPU_SREG_ES;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003691 c->dst.val = 0;
3692 break;
Marcelo Tosatti221192b2011-05-30 15:23:14 -03003693 case DstDX:
3694 c->dst.type = OP_REG;
3695 c->dst.bytes = 2;
3696 c->dst.addr.reg = &c->regs[VCPU_REGS_RDX];
3697 fetch_register_operand(&c->dst);
3698 break;
Wei Yongjun36089fe2010-08-04 15:38:18 +08003699 case ImplicitOps:
3700 /* Special instructions do their own operand decoding. */
3701 default:
3702 c->dst.type = OP_NONE; /* Disable writeback. */
3703 return 0;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003704 }
3705
3706done:
Gleb Natapova0c0ab22011-03-28 16:57:49 +02003707 return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003708}
3709
Gleb Natapov3e2f65d2010-08-25 12:47:42 +03003710static bool string_insn_completed(struct x86_emulate_ctxt *ctxt)
3711{
3712 struct decode_cache *c = &ctxt->decode;
3713
3714 /* The second termination condition only applies for REPE
3715 * and REPNE. Test if the repeat string operation prefix is
3716 * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
3717 * corresponding termination condition according to:
3718 * - if REPE/REPZ and ZF = 0 then done
3719 * - if REPNE/REPNZ and ZF = 1 then done
3720 */
3721 if (((c->b == 0xa6) || (c->b == 0xa7) ||
3722 (c->b == 0xae) || (c->b == 0xaf))
3723 && (((c->rep_prefix == REPE_PREFIX) &&
3724 ((ctxt->eflags & EFLG_ZF) == 0))
3725 || ((c->rep_prefix == REPNE_PREFIX) &&
3726 ((ctxt->eflags & EFLG_ZF) == EFLG_ZF))))
3727 return true;
3728
3729 return false;
3730}
3731
Avi Kivitydde7e6d2010-07-29 15:11:52 +03003732int
Avi Kivity9aabc882010-07-29 15:11:50 +03003733x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
Laurent Vivier8b4caf62007-09-18 11:27:19 +02003734{
Avi Kivity9aabc882010-07-29 15:11:50 +03003735 struct x86_emulate_ops *ops = ctxt->ops;
Laurent Vivier8b4caf62007-09-18 11:27:19 +02003736 u64 msr_data;
Laurent Vivier8b4caf62007-09-18 11:27:19 +02003737 struct decode_cache *c = &ctxt->decode;
Takuya Yoshikawa1b30eaa2010-02-12 15:57:56 +09003738 int rc = X86EMUL_CONTINUE;
Gleb Natapov5cd21912010-03-18 15:20:26 +02003739 int saved_dst_type = c->dst.type;
Mohammed Gamal6e154e52010-08-04 14:38:06 +03003740 int irq; /* Used for int 3, int, and into */
Laurent Vivier8b4caf62007-09-18 11:27:19 +02003741
Gleb Natapov9de41572010-04-28 19:15:22 +03003742 ctxt->decode.mem_read.pos = 0;
Glauber Costa310b5d32009-05-12 16:21:06 -04003743
Gleb Natapov11616242010-02-11 14:43:14 +02003744 if (ctxt->mode == X86EMUL_MODE_PROT64 && (c->d & No64)) {
Avi Kivity35d3d4a2010-11-22 17:53:25 +02003745 rc = emulate_ud(ctxt);
Gleb Natapov11616242010-02-11 14:43:14 +02003746 goto done;
3747 }
3748
Gleb Natapovd380a5e2010-02-10 14:21:36 +02003749 /* LOCK prefix is allowed only with some instructions */
Gleb Natapova41ffb752010-03-18 15:20:14 +02003750 if (c->lock_prefix && (!(c->d & Lock) || c->dst.type != OP_MEM)) {
Avi Kivity35d3d4a2010-11-22 17:53:25 +02003751 rc = emulate_ud(ctxt);
Gleb Natapovd380a5e2010-02-10 14:21:36 +02003752 goto done;
3753 }
3754
Avi Kivity081bca02010-08-26 11:06:15 +03003755 if ((c->d & SrcMask) == SrcMemFAddr && c->src.type != OP_MEM) {
Avi Kivity35d3d4a2010-11-22 17:53:25 +02003756 rc = emulate_ud(ctxt);
Avi Kivity081bca02010-08-26 11:06:15 +03003757 goto done;
3758 }
3759
Avi Kivity12537912011-03-29 11:41:27 +02003760 if ((c->d & Sse)
Avi Kivity717746e2011-04-20 13:37:53 +03003761 && ((ops->get_cr(ctxt, 0) & X86_CR0_EM)
3762 || !(ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR))) {
Avi Kivity12537912011-03-29 11:41:27 +02003763 rc = emulate_ud(ctxt);
3764 goto done;
3765 }
3766
Avi Kivity717746e2011-04-20 13:37:53 +03003767 if ((c->d & Sse) && (ops->get_cr(ctxt, 0) & X86_CR0_TS)) {
Avi Kivity12537912011-03-29 11:41:27 +02003768 rc = emulate_nm(ctxt);
3769 goto done;
3770 }
3771
Avi Kivityc4f035c2011-04-04 12:39:22 +02003772 if (unlikely(ctxt->guest_mode) && c->intercept) {
Joerg Roedel8a76d7f2011-04-04 12:39:27 +02003773 rc = emulator_check_intercept(ctxt, c->intercept,
3774 X86_ICPT_PRE_EXCEPT);
Avi Kivityc4f035c2011-04-04 12:39:22 +02003775 if (rc != X86EMUL_CONTINUE)
3776 goto done;
3777 }
3778
Gleb Natapove92805a2010-02-10 14:21:35 +02003779 /* Privileged instruction can be executed only in CPL=0 */
Avi Kivity717746e2011-04-20 13:37:53 +03003780 if ((c->d & Priv) && ops->cpl(ctxt)) {
Avi Kivity35d3d4a2010-11-22 17:53:25 +02003781 rc = emulate_gp(ctxt, 0);
Gleb Natapove92805a2010-02-10 14:21:35 +02003782 goto done;
3783 }
3784
Joerg Roedel8ea7d6a2011-04-04 12:39:26 +02003785 /* Instruction can only be executed in protected mode */
3786 if ((c->d & Prot) && !(ctxt->mode & X86EMUL_MODE_PROT)) {
3787 rc = emulate_ud(ctxt);
3788 goto done;
3789 }
3790
Joerg Roedeld09beab2011-04-04 12:39:25 +02003791 /* Do instruction specific permission checks */
3792 if (c->check_perm) {
3793 rc = c->check_perm(ctxt);
3794 if (rc != X86EMUL_CONTINUE)
3795 goto done;
3796 }
3797
Avi Kivityc4f035c2011-04-04 12:39:22 +02003798 if (unlikely(ctxt->guest_mode) && c->intercept) {
Joerg Roedel8a76d7f2011-04-04 12:39:27 +02003799 rc = emulator_check_intercept(ctxt, c->intercept,
3800 X86_ICPT_POST_EXCEPT);
Avi Kivityc4f035c2011-04-04 12:39:22 +02003801 if (rc != X86EMUL_CONTINUE)
3802 goto done;
3803 }
3804
Avi Kivityb9fa9d62007-11-27 19:05:37 +02003805 if (c->rep_prefix && (c->d & String)) {
3806 /* All REP prefixes have the same first termination condition */
Gleb Natapovc73e1972010-03-15 16:38:29 +02003807 if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0) {
Gleb Natapov95c55882010-04-28 19:15:39 +03003808 ctxt->eip = c->eip;
Avi Kivityb9fa9d62007-11-27 19:05:37 +02003809 goto done;
3810 }
Avi Kivityb9fa9d62007-11-27 19:05:37 +02003811 }
3812
Wei Yongjunc483c022010-08-06 15:36:36 +08003813 if ((c->src.type == OP_MEM) && !(c->d & NoAccess)) {
Avi Kivity3ca3ac42011-03-31 16:52:26 +02003814 rc = segmented_read(ctxt, c->src.addr.mem,
3815 c->src.valptr, c->src.bytes);
Takuya Yoshikawab60d5132010-01-20 16:47:21 +09003816 if (rc != X86EMUL_CONTINUE)
Laurent Vivier8b4caf62007-09-18 11:27:19 +02003817 goto done;
Avi Kivity16518d52010-08-26 14:31:30 +03003818 c->src.orig_val64 = c->src.val64;
Laurent Vivier8b4caf62007-09-18 11:27:19 +02003819 }
3820
Gleb Natapove35b7b92010-02-25 16:36:42 +02003821 if (c->src2.type == OP_MEM) {
Avi Kivity3ca3ac42011-03-31 16:52:26 +02003822 rc = segmented_read(ctxt, c->src2.addr.mem,
3823 &c->src2.val, c->src2.bytes);
Gleb Natapove35b7b92010-02-25 16:36:42 +02003824 if (rc != X86EMUL_CONTINUE)
3825 goto done;
3826 }
3827
Laurent Vivier8b4caf62007-09-18 11:27:19 +02003828 if ((c->d & DstMask) == ImplicitOps)
3829 goto special_insn;
3830
3831
Gleb Natapov69f55cb2010-03-18 15:20:20 +02003832 if ((c->dst.type == OP_MEM) && !(c->d & Mov)) {
3833 /* optimisation - avoid slow emulated read if Mov */
Avi Kivity3ca3ac42011-03-31 16:52:26 +02003834 rc = segmented_read(ctxt, c->dst.addr.mem,
Gleb Natapov9de41572010-04-28 19:15:22 +03003835 &c->dst.val, c->dst.bytes);
Gleb Natapov69f55cb2010-03-18 15:20:20 +02003836 if (rc != X86EMUL_CONTINUE)
3837 goto done;
Avi Kivity038e51d2007-01-22 20:40:40 -08003838 }
Laurent Viviere4e03de2007-09-18 11:52:50 +02003839 c->dst.orig_val = c->dst.val;
Avi Kivity038e51d2007-01-22 20:40:40 -08003840
Avi Kivity018a98d2007-11-27 19:30:56 +02003841special_insn:
3842
Avi Kivityc4f035c2011-04-04 12:39:22 +02003843 if (unlikely(ctxt->guest_mode) && c->intercept) {
Joerg Roedel8a76d7f2011-04-04 12:39:27 +02003844 rc = emulator_check_intercept(ctxt, c->intercept,
3845 X86_ICPT_POST_MEMACCESS);
Avi Kivityc4f035c2011-04-04 12:39:22 +02003846 if (rc != X86EMUL_CONTINUE)
3847 goto done;
3848 }
3849
Avi Kivityef65c882010-07-29 15:11:51 +03003850 if (c->execute) {
3851 rc = c->execute(ctxt);
3852 if (rc != X86EMUL_CONTINUE)
3853 goto done;
3854 goto writeback;
3855 }
3856
Laurent Viviere4e03de2007-09-18 11:52:50 +02003857 if (c->twobyte)
Avi Kivity6aa8b732006-12-10 02:21:36 -08003858 goto twobyte_insn;
3859
Laurent Viviere4e03de2007-09-18 11:52:50 +02003860 switch (c->b) {
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003861 case 0x06: /* push es */
Takuya Yoshikawa4179bb02011-04-13 00:29:09 +09003862 rc = emulate_push_sreg(ctxt, ops, VCPU_SREG_ES);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003863 break;
3864 case 0x07: /* pop es */
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003865 rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_ES);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003866 break;
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003867 case 0x0e: /* push cs */
Takuya Yoshikawa4179bb02011-04-13 00:29:09 +09003868 rc = emulate_push_sreg(ctxt, ops, VCPU_SREG_CS);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003869 break;
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003870 case 0x16: /* push ss */
Takuya Yoshikawa4179bb02011-04-13 00:29:09 +09003871 rc = emulate_push_sreg(ctxt, ops, VCPU_SREG_SS);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003872 break;
3873 case 0x17: /* pop ss */
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003874 rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_SS);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003875 break;
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003876 case 0x1e: /* push ds */
Takuya Yoshikawa4179bb02011-04-13 00:29:09 +09003877 rc = emulate_push_sreg(ctxt, ops, VCPU_SREG_DS);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003878 break;
3879 case 0x1f: /* pop ds */
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003880 rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_DS);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03003881 break;
Avi Kivity33615aa2007-10-31 11:15:56 +02003882 case 0x40 ... 0x47: /* inc r16/r32 */
3883 emulate_1op("inc", c->dst, ctxt->eflags);
3884 break;
3885 case 0x48 ... 0x4f: /* dec r16/r32 */
3886 emulate_1op("dec", c->dst, ctxt->eflags);
3887 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08003888 case 0x63: /* movsxd */
Laurent Vivier8b4caf62007-09-18 11:27:19 +02003889 if (ctxt->mode != X86EMUL_MODE_PROT64)
Avi Kivity6aa8b732006-12-10 02:21:36 -08003890 goto cannot_emulate;
Laurent Viviere4e03de2007-09-18 11:52:50 +02003891 c->dst.val = (s32) c->src.val;
Avi Kivity6aa8b732006-12-10 02:21:36 -08003892 break;
Avi Kivity018a98d2007-11-27 19:30:56 +02003893 case 0x6c: /* insb */
3894 case 0x6d: /* insw/insd */
Wei Yongjuna13a63f2010-08-06 11:46:12 +08003895 c->src.val = c->regs[VCPU_REGS_RDX];
3896 goto do_io_in;
Avi Kivity018a98d2007-11-27 19:30:56 +02003897 case 0x6e: /* outsb */
3898 case 0x6f: /* outsw/outsd */
Wei Yongjuna13a63f2010-08-06 11:46:12 +08003899 c->dst.val = c->regs[VCPU_REGS_RDX];
3900 goto do_io_out;
Gleb Natapov79729952010-03-18 15:20:24 +02003901 break;
Gleb Natapovb2833e32009-04-12 13:36:30 +03003902 case 0x70 ... 0x7f: /* jcc (short) */
Avi Kivity018a98d2007-11-27 19:30:56 +02003903 if (test_cc(c->b, ctxt->eflags))
Gleb Natapovb2833e32009-04-12 13:36:30 +03003904 jmp_rel(c, c->src.val);
Avi Kivity018a98d2007-11-27 19:30:56 +02003905 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08003906 case 0x84 ... 0x85:
Mohammed Gamaldfb507c2010-05-11 22:22:40 +03003907 test:
Laurent Vivier05f086f2007-09-24 11:10:55 +02003908 emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags);
Avi Kivity6aa8b732006-12-10 02:21:36 -08003909 break;
3910 case 0x86 ... 0x87: /* xchg */
Mohammed Gamalb13354f2008-06-15 19:37:38 +03003911 xchg:
Avi Kivity6aa8b732006-12-10 02:21:36 -08003912 /* Write back the register source. */
Wei Yongjun31be40b2010-08-17 09:17:30 +08003913 c->src.val = c->dst.val;
3914 write_register_operand(&c->src);
Avi Kivity6aa8b732006-12-10 02:21:36 -08003915 /*
3916 * Write back the memory destination with implicit LOCK
3917 * prefix.
3918 */
Wei Yongjun31be40b2010-08-17 09:17:30 +08003919 c->dst.val = c->src.orig_val;
Laurent Viviere4e03de2007-09-18 11:52:50 +02003920 c->lock_prefix = 1;
Avi Kivity6aa8b732006-12-10 02:21:36 -08003921 break;
Gleb Natapov79168fd2010-04-28 19:15:30 +03003922 case 0x8c: /* mov r/m, sreg */
3923 if (c->modrm_reg > VCPU_SREG_GS) {
Avi Kivity35d3d4a2010-11-22 17:53:25 +02003924 rc = emulate_ud(ctxt);
Gleb Natapov5e3ae6c2010-03-18 15:20:07 +02003925 goto done;
Guillaume Thouvenin38d5bc62008-05-27 15:13:28 +02003926 }
Avi Kivity1aa36612011-04-27 13:20:30 +03003927 c->dst.val = get_segment_selector(ctxt, c->modrm_reg);
Guillaume Thouvenin38d5bc62008-05-27 15:13:28 +02003928 break;
Nitin A Kamble7e0b54b2007-09-15 10:35:36 +03003929 case 0x8d: /* lea r16/r32, m */
Avi Kivity90de84f2010-11-17 15:28:21 +02003930 c->dst.val = c->src.addr.mem.ea;
Nitin A Kamble7e0b54b2007-09-15 10:35:36 +03003931 break;
Guillaume Thouvenin42571982008-05-27 14:49:15 +02003932 case 0x8e: { /* mov seg, r/m16 */
3933 uint16_t sel;
Guillaume Thouvenin42571982008-05-27 14:49:15 +02003934
3935 sel = c->src.val;
Gleb Natapov8b9f4412010-02-18 12:14:59 +02003936
Gleb Natapovc6975182010-02-18 12:15:01 +02003937 if (c->modrm_reg == VCPU_SREG_CS ||
3938 c->modrm_reg > VCPU_SREG_GS) {
Avi Kivity35d3d4a2010-11-22 17:53:25 +02003939 rc = emulate_ud(ctxt);
Gleb Natapov8b9f4412010-02-18 12:14:59 +02003940 goto done;
3941 }
3942
Glauber Costa310b5d32009-05-12 16:21:06 -04003943 if (c->modrm_reg == VCPU_SREG_SS)
Gleb Natapov95cb2292010-04-28 19:15:43 +03003944 ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS;
Glauber Costa310b5d32009-05-12 16:21:06 -04003945
Gleb Natapov2e873022010-03-18 15:20:18 +02003946 rc = load_segment_descriptor(ctxt, ops, sel, c->modrm_reg);
Guillaume Thouvenin42571982008-05-27 14:49:15 +02003947
3948 c->dst.type = OP_NONE; /* Disable writeback. */
3949 break;
3950 }
Avi Kivity6aa8b732006-12-10 02:21:36 -08003951 case 0x8f: /* pop (sole member of Grp1a) */
Takuya Yoshikawa51187682011-05-02 02:29:17 +09003952 rc = em_grp1a(ctxt);
Avi Kivity6aa8b732006-12-10 02:21:36 -08003953 break;
Avi Kivity3d9e77d2010-08-01 12:41:59 +03003954 case 0x90 ... 0x97: /* nop / xchg reg, rax */
3955 if (c->dst.addr.reg == &c->regs[VCPU_REGS_RAX])
Mohammed Gamal34698d82010-08-04 14:41:04 +03003956 break;
Mohammed Gamalb13354f2008-06-15 19:37:38 +03003957 goto xchg;
Wei Yongjune8b6fa72010-08-18 16:43:13 +08003958 case 0x98: /* cbw/cwde/cdqe */
3959 switch (c->op_bytes) {
3960 case 2: c->dst.val = (s8)c->dst.val; break;
3961 case 4: c->dst.val = (s16)c->dst.val; break;
3962 case 8: c->dst.val = (s32)c->dst.val; break;
3963 }
3964 break;
Mohammed Gamaldfb507c2010-05-11 22:22:40 +03003965 case 0xa8 ... 0xa9: /* test ax, imm */
3966 goto test;
Avi Kivity018a98d2007-11-27 19:30:56 +02003967 case 0xc0 ... 0xc1:
Takuya Yoshikawa51187682011-05-02 02:29:17 +09003968 rc = em_grp2(ctxt);
Avi Kivity018a98d2007-11-27 19:30:56 +02003969 break;
Avi Kivity111de5d2007-11-27 19:14:21 +02003970 case 0xc3: /* ret */
Avi Kivitycf5de4f2008-11-28 00:14:07 +02003971 c->dst.type = OP_REG;
Avi Kivity1a6440a2010-08-01 12:35:10 +03003972 c->dst.addr.reg = &c->eip;
Avi Kivitycf5de4f2008-11-28 00:14:07 +02003973 c->dst.bytes = c->op_bytes;
Takuya Yoshikawac54fe502011-04-23 18:49:40 +09003974 rc = em_pop(ctxt);
3975 break;
Wei Yongjun09b5f4d2010-08-23 14:56:54 +08003976 case 0xc4: /* les */
3977 rc = emulate_load_segment(ctxt, ops, VCPU_SREG_ES);
Wei Yongjun09b5f4d2010-08-23 14:56:54 +08003978 break;
3979 case 0xc5: /* lds */
3980 rc = emulate_load_segment(ctxt, ops, VCPU_SREG_DS);
Wei Yongjun09b5f4d2010-08-23 14:56:54 +08003981 break;
Avi Kivitya77ab5e2009-01-05 13:27:34 +02003982 case 0xcb: /* ret far */
3983 rc = emulate_ret_far(ctxt, ops);
Avi Kivitya77ab5e2009-01-05 13:27:34 +02003984 break;
Mohammed Gamal6e154e52010-08-04 14:38:06 +03003985 case 0xcc: /* int3 */
3986 irq = 3;
3987 goto do_interrupt;
3988 case 0xcd: /* int n */
3989 irq = c->src.val;
3990 do_interrupt:
3991 rc = emulate_int(ctxt, ops, irq);
Mohammed Gamal6e154e52010-08-04 14:38:06 +03003992 break;
3993 case 0xce: /* into */
3994 if (ctxt->eflags & EFLG_OF) {
3995 irq = 4;
3996 goto do_interrupt;
3997 }
3998 break;
Mohammed Gamal62bd4302010-07-28 12:38:40 +03003999 case 0xcf: /* iret */
4000 rc = emulate_iret(ctxt, ops);
Mohammed Gamal62bd4302010-07-28 12:38:40 +03004001 break;
Avi Kivity018a98d2007-11-27 19:30:56 +02004002 case 0xd0 ... 0xd1: /* Grp2 */
Takuya Yoshikawa51187682011-05-02 02:29:17 +09004003 rc = em_grp2(ctxt);
Avi Kivity018a98d2007-11-27 19:30:56 +02004004 break;
4005 case 0xd2 ... 0xd3: /* Grp2 */
4006 c->src.val = c->regs[VCPU_REGS_RCX];
Takuya Yoshikawa51187682011-05-02 02:29:17 +09004007 rc = em_grp2(ctxt);
Avi Kivity018a98d2007-11-27 19:30:56 +02004008 break;
Wei Yongjunf2f31842010-08-18 16:38:21 +08004009 case 0xe0 ... 0xe2: /* loop/loopz/loopnz */
4010 register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);
4011 if (address_mask(c, c->regs[VCPU_REGS_RCX]) != 0 &&
4012 (c->b == 0xe2 || test_cc(c->b ^ 0x5, ctxt->eflags)))
4013 jmp_rel(c, c->src.val);
4014 break;
Wei Yongjune4abac62010-08-19 14:25:48 +08004015 case 0xe3: /* jcxz/jecxz/jrcxz */
4016 if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0)
4017 jmp_rel(c, c->src.val);
4018 break;
Mohammed Gamala6a30342008-09-06 17:22:29 +03004019 case 0xe4: /* inb */
4020 case 0xe5: /* in */
Gleb Natapovcf8f70b2010-03-18 15:20:23 +02004021 goto do_io_in;
Mohammed Gamala6a30342008-09-06 17:22:29 +03004022 case 0xe6: /* outb */
4023 case 0xe7: /* out */
Gleb Natapovcf8f70b2010-03-18 15:20:23 +02004024 goto do_io_out;
Nitin A Kamble1a52e052007-09-18 16:34:25 -07004025 case 0xe8: /* call (near) */ {
Gleb Natapovd53c4772009-04-12 13:36:36 +03004026 long int rel = c->src.val;
Laurent Viviere4e03de2007-09-18 11:52:50 +02004027 c->src.val = (unsigned long) c->eip;
Harvey Harrison7a9572752008-02-19 07:40:41 -08004028 jmp_rel(c, rel);
Takuya Yoshikawa4487b3b2011-04-13 00:31:23 +09004029 rc = em_push(ctxt);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02004030 break;
Nitin A Kamble1a52e052007-09-18 16:34:25 -07004031 }
4032 case 0xe9: /* jmp rel */
Guillaume Thouvenin954cd362008-05-27 10:19:08 +02004033 goto jmp;
Takuya Yoshikawad2f62762011-05-02 02:30:48 +09004034 case 0xea: /* jmp far */
4035 rc = em_jmp_far(ctxt);
Guillaume Thouvenin954cd362008-05-27 10:19:08 +02004036 break;
Guillaume Thouvenin954cd362008-05-27 10:19:08 +02004037 case 0xeb:
4038 jmp: /* jmp rel short */
Harvey Harrison7a9572752008-02-19 07:40:41 -08004039 jmp_rel(c, c->src.val);
Laurent Viviera01af5e2007-09-24 11:10:56 +02004040 c->dst.type = OP_NONE; /* Disable writeback. */
Nitin A Kamble1a52e052007-09-18 16:34:25 -07004041 break;
Mohammed Gamala6a30342008-09-06 17:22:29 +03004042 case 0xec: /* in al,dx */
4043 case 0xed: /* in (e/r)ax,dx */
Gleb Natapovcf8f70b2010-03-18 15:20:23 +02004044 do_io_in:
Gleb Natapov7b262e92010-03-18 15:20:27 +02004045 if (!pio_in_emulated(ctxt, ops, c->dst.bytes, c->src.val,
4046 &c->dst.val))
Gleb Natapovcf8f70b2010-03-18 15:20:23 +02004047 goto done; /* IO is needed */
4048 break;
Wei Yongjunce7a0ad2010-07-06 16:50:21 +08004049 case 0xee: /* out dx,al */
4050 case 0xef: /* out dx,(e/r)ax */
Gleb Natapovcf8f70b2010-03-18 15:20:23 +02004051 do_io_out:
Avi Kivityca1d4a92011-04-20 13:37:53 +03004052 ops->pio_out_emulated(ctxt, c->src.bytes, c->dst.val,
4053 &c->src.val, 1);
Gleb Natapovcf8f70b2010-03-18 15:20:23 +02004054 c->dst.type = OP_NONE; /* Disable writeback. */
Guillaume Thouvenine93f36b2008-10-28 10:51:30 +01004055 break;
Avi Kivity111de5d2007-11-27 19:14:21 +02004056 case 0xf4: /* hlt */
Avi Kivity6c3287f2011-04-20 15:43:05 +03004057 ctxt->ops->halt(ctxt);
Mohammed Gamal19fdfa02008-07-06 16:51:26 +03004058 break;
Avi Kivity111de5d2007-11-27 19:14:21 +02004059 case 0xf5: /* cmc */
4060 /* complement carry flag from eflags reg */
4061 ctxt->eflags ^= EFLG_CF;
Avi Kivity111de5d2007-11-27 19:14:21 +02004062 break;
Avi Kivity018a98d2007-11-27 19:30:56 +02004063 case 0xf6 ... 0xf7: /* Grp3 */
Takuya Yoshikawa51187682011-05-02 02:29:17 +09004064 rc = em_grp3(ctxt);
Avi Kivity018a98d2007-11-27 19:30:56 +02004065 break;
Avi Kivity111de5d2007-11-27 19:14:21 +02004066 case 0xf8: /* clc */
4067 ctxt->eflags &= ~EFLG_CF;
Avi Kivity111de5d2007-11-27 19:14:21 +02004068 break;
Mohammed Gamal8744aa92010-08-05 15:42:49 +03004069 case 0xf9: /* stc */
4070 ctxt->eflags |= EFLG_CF;
4071 break;
Avi Kivity111de5d2007-11-27 19:14:21 +02004072 case 0xfa: /* cli */
Wei Yongjun07cbc6c2010-07-06 16:54:19 +08004073 if (emulator_bad_iopl(ctxt, ops)) {
Avi Kivity35d3d4a2010-11-22 17:53:25 +02004074 rc = emulate_gp(ctxt, 0);
Wei Yongjun07cbc6c2010-07-06 16:54:19 +08004075 goto done;
Wei Yongjun36089fe2010-08-04 15:38:18 +08004076 } else
Gleb Natapovf850e2e2010-02-10 14:21:33 +02004077 ctxt->eflags &= ~X86_EFLAGS_IF;
Avi Kivity111de5d2007-11-27 19:14:21 +02004078 break;
4079 case 0xfb: /* sti */
Wei Yongjun07cbc6c2010-07-06 16:54:19 +08004080 if (emulator_bad_iopl(ctxt, ops)) {
Avi Kivity35d3d4a2010-11-22 17:53:25 +02004081 rc = emulate_gp(ctxt, 0);
Wei Yongjun07cbc6c2010-07-06 16:54:19 +08004082 goto done;
4083 } else {
Gleb Natapov95cb2292010-04-28 19:15:43 +03004084 ctxt->interruptibility = KVM_X86_SHADOW_INT_STI;
Gleb Natapovf850e2e2010-02-10 14:21:33 +02004085 ctxt->eflags |= X86_EFLAGS_IF;
Gleb Natapovf850e2e2010-02-10 14:21:33 +02004086 }
Avi Kivity111de5d2007-11-27 19:14:21 +02004087 break;
Mohammed Gamalfb4616f2008-09-01 04:52:24 +03004088 case 0xfc: /* cld */
4089 ctxt->eflags &= ~EFLG_DF;
Mohammed Gamalfb4616f2008-09-01 04:52:24 +03004090 break;
4091 case 0xfd: /* std */
4092 ctxt->eflags |= EFLG_DF;
Mohammed Gamalfb4616f2008-09-01 04:52:24 +03004093 break;
Gleb Natapovea798492010-02-25 16:36:43 +02004094 case 0xfe: /* Grp4 */
Takuya Yoshikawa51187682011-05-02 02:29:17 +09004095 rc = em_grp45(ctxt);
Avi Kivity018a98d2007-11-27 19:30:56 +02004096 break;
Gleb Natapovea798492010-02-25 16:36:43 +02004097 case 0xff: /* Grp5 */
Takuya Yoshikawa51187682011-05-02 02:29:17 +09004098 rc = em_grp45(ctxt);
4099 break;
Avi Kivity91269b82010-07-25 14:51:16 +03004100 default:
4101 goto cannot_emulate;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004102 }
Avi Kivity018a98d2007-11-27 19:30:56 +02004103
Avi Kivity7d9ddae2010-08-30 17:12:28 +03004104 if (rc != X86EMUL_CONTINUE)
4105 goto done;
4106
Avi Kivity018a98d2007-11-27 19:30:56 +02004107writeback:
Takuya Yoshikawaadddcec2011-05-02 02:26:23 +09004108 rc = writeback(ctxt);
Takuya Yoshikawa1b30eaa2010-02-12 15:57:56 +09004109 if (rc != X86EMUL_CONTINUE)
Avi Kivity018a98d2007-11-27 19:30:56 +02004110 goto done;
4111
Gleb Natapov5cd21912010-03-18 15:20:26 +02004112 /*
4113 * restore dst type in case the decoding will be reused
4114 * (happens for string instruction )
4115 */
4116 c->dst.type = saved_dst_type;
4117
Gleb Natapova682e352010-03-18 15:20:21 +02004118 if ((c->d & SrcMask) == SrcSI)
Takuya Yoshikawac1ed6de2011-05-02 02:23:13 +09004119 string_addr_inc(ctxt, seg_override(ctxt, c),
Gleb Natapov79168fd2010-04-28 19:15:30 +03004120 VCPU_REGS_RSI, &c->src);
Gleb Natapova682e352010-03-18 15:20:21 +02004121
4122 if ((c->d & DstMask) == DstDI)
Avi Kivity90de84f2010-11-17 15:28:21 +02004123 string_addr_inc(ctxt, VCPU_SREG_ES, VCPU_REGS_RDI,
Gleb Natapov79168fd2010-04-28 19:15:30 +03004124 &c->dst);
Gleb Natapovd9271122010-03-18 15:20:22 +02004125
Gleb Natapov5cd21912010-03-18 15:20:26 +02004126 if (c->rep_prefix && (c->d & String)) {
Gleb Natapov6e2fb2c2010-08-25 12:47:41 +03004127 struct read_cache *r = &ctxt->decode.io_read;
Gleb Natapovd9271122010-03-18 15:20:22 +02004128 register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);
Gleb Natapov3e2f65d2010-08-25 12:47:42 +03004129
Gleb Natapovd2ddd1c2010-08-25 12:47:43 +03004130 if (!string_insn_completed(ctxt)) {
4131 /*
4132 * Re-enter guest when pio read ahead buffer is empty
4133 * or, if it is not used, after each 1024 iteration.
4134 */
4135 if ((r->end != 0 || c->regs[VCPU_REGS_RCX] & 0x3ff) &&
4136 (r->end == 0 || r->end != r->pos)) {
4137 /*
4138 * Reset read cache. Usually happens before
4139 * decode, but since instruction is restarted
4140 * we have to do it here.
4141 */
4142 ctxt->decode.mem_read.end = 0;
4143 return EMULATION_RESTART;
4144 }
4145 goto done; /* skip rip writeback */
Avi Kivity0fa6ccb2010-08-17 11:22:17 +03004146 }
Gleb Natapov5cd21912010-03-18 15:20:26 +02004147 }
Gleb Natapovd2ddd1c2010-08-25 12:47:43 +03004148
4149 ctxt->eip = c->eip;
Avi Kivity018a98d2007-11-27 19:30:56 +02004150
4151done:
Avi Kivityda9cb572010-11-22 17:53:21 +02004152 if (rc == X86EMUL_PROPAGATE_FAULT)
4153 ctxt->have_exception = true;
Joerg Roedel775fde82011-04-04 12:39:24 +02004154 if (rc == X86EMUL_INTERCEPTED)
4155 return EMULATION_INTERCEPTED;
4156
Gleb Natapovd2ddd1c2010-08-25 12:47:43 +03004157 return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004158
4159twobyte_insn:
Laurent Viviere4e03de2007-09-18 11:52:50 +02004160 switch (c->b) {
Andre Przywarae99f0502009-06-17 15:50:33 +02004161 case 0x05: /* syscall */
Gleb Natapov3fb1b5d2010-04-28 19:15:28 +03004162 rc = emulate_syscall(ctxt, ops);
Andre Przywarae99f0502009-06-17 15:50:33 +02004163 break;
Avi Kivity018a98d2007-11-27 19:30:56 +02004164 case 0x06:
Avi Kivity2d04a052011-04-20 15:32:49 +03004165 rc = em_clts(ctxt);
Avi Kivity018a98d2007-11-27 19:30:56 +02004166 break;
Avi Kivity018a98d2007-11-27 19:30:56 +02004167 case 0x09: /* wbinvd */
Clemens Nosscfb22372011-04-21 21:16:05 +02004168 (ctxt->ops->wbinvd)(ctxt);
Sheng Yangf5f48ee2010-06-30 12:25:15 +08004169 break;
4170 case 0x08: /* invd */
Avi Kivity018a98d2007-11-27 19:30:56 +02004171 case 0x0d: /* GrpP (prefetch) */
4172 case 0x18: /* Grp16 (prefetch/nop) */
Avi Kivity018a98d2007-11-27 19:30:56 +02004173 break;
4174 case 0x20: /* mov cr, reg */
Avi Kivity717746e2011-04-20 13:37:53 +03004175 c->dst.val = ops->get_cr(ctxt, c->modrm_reg);
Avi Kivity018a98d2007-11-27 19:30:56 +02004176 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004177 case 0x21: /* mov from dr to reg */
Avi Kivity717746e2011-04-20 13:37:53 +03004178 ops->get_dr(ctxt, c->modrm_reg, &c->dst.val);
Avi Kivity6aa8b732006-12-10 02:21:36 -08004179 break;
Avi Kivity018a98d2007-11-27 19:30:56 +02004180 case 0x22: /* mov reg, cr */
Avi Kivity717746e2011-04-20 13:37:53 +03004181 if (ops->set_cr(ctxt, c->modrm_reg, c->src.val)) {
Gleb Natapov54b84862010-04-28 19:15:44 +03004182 emulate_gp(ctxt, 0);
Avi Kivityda9cb572010-11-22 17:53:21 +02004183 rc = X86EMUL_PROPAGATE_FAULT;
Gleb Natapov0f122442010-04-28 19:15:31 +03004184 goto done;
4185 }
Avi Kivity018a98d2007-11-27 19:30:56 +02004186 c->dst.type = OP_NONE;
4187 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004188 case 0x23: /* mov from reg to dr */
Avi Kivity717746e2011-04-20 13:37:53 +03004189 if (ops->set_dr(ctxt, c->modrm_reg, c->src.val &
Gleb Natapov338dbc92010-04-28 19:15:32 +03004190 ((ctxt->mode == X86EMUL_MODE_PROT64) ?
Avi Kivity717746e2011-04-20 13:37:53 +03004191 ~0ULL : ~0U)) < 0) {
Gleb Natapov338dbc92010-04-28 19:15:32 +03004192 /* #UD condition is already handled by the code above */
Gleb Natapov54b84862010-04-28 19:15:44 +03004193 emulate_gp(ctxt, 0);
Avi Kivityda9cb572010-11-22 17:53:21 +02004194 rc = X86EMUL_PROPAGATE_FAULT;
Gleb Natapov338dbc92010-04-28 19:15:32 +03004195 goto done;
4196 }
4197
Laurent Viviera01af5e2007-09-24 11:10:56 +02004198 c->dst.type = OP_NONE; /* no writeback */
Avi Kivity6aa8b732006-12-10 02:21:36 -08004199 break;
Avi Kivity018a98d2007-11-27 19:30:56 +02004200 case 0x30:
4201 /* wrmsr */
4202 msr_data = (u32)c->regs[VCPU_REGS_RAX]
4203 | ((u64)c->regs[VCPU_REGS_RDX] << 32);
Avi Kivity717746e2011-04-20 13:37:53 +03004204 if (ops->set_msr(ctxt, c->regs[VCPU_REGS_RCX], msr_data)) {
Gleb Natapov54b84862010-04-28 19:15:44 +03004205 emulate_gp(ctxt, 0);
Avi Kivityda9cb572010-11-22 17:53:21 +02004206 rc = X86EMUL_PROPAGATE_FAULT;
Gleb Natapovfd525362010-03-18 15:20:13 +02004207 goto done;
Avi Kivity018a98d2007-11-27 19:30:56 +02004208 }
4209 rc = X86EMUL_CONTINUE;
Avi Kivity018a98d2007-11-27 19:30:56 +02004210 break;
4211 case 0x32:
4212 /* rdmsr */
Avi Kivity717746e2011-04-20 13:37:53 +03004213 if (ops->get_msr(ctxt, c->regs[VCPU_REGS_RCX], &msr_data)) {
Gleb Natapov54b84862010-04-28 19:15:44 +03004214 emulate_gp(ctxt, 0);
Avi Kivityda9cb572010-11-22 17:53:21 +02004215 rc = X86EMUL_PROPAGATE_FAULT;
Gleb Natapovfd525362010-03-18 15:20:13 +02004216 goto done;
Avi Kivity018a98d2007-11-27 19:30:56 +02004217 } else {
4218 c->regs[VCPU_REGS_RAX] = (u32)msr_data;
4219 c->regs[VCPU_REGS_RDX] = msr_data >> 32;
4220 }
4221 rc = X86EMUL_CONTINUE;
Avi Kivity018a98d2007-11-27 19:30:56 +02004222 break;
Andre Przywarae99f0502009-06-17 15:50:33 +02004223 case 0x34: /* sysenter */
Gleb Natapov3fb1b5d2010-04-28 19:15:28 +03004224 rc = emulate_sysenter(ctxt, ops);
Andre Przywarae99f0502009-06-17 15:50:33 +02004225 break;
4226 case 0x35: /* sysexit */
Gleb Natapov3fb1b5d2010-04-28 19:15:28 +03004227 rc = emulate_sysexit(ctxt, ops);
Andre Przywarae99f0502009-06-17 15:50:33 +02004228 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004229 case 0x40 ... 0x4f: /* cmov */
Laurent Viviere4e03de2007-09-18 11:52:50 +02004230 c->dst.val = c->dst.orig_val = c->src.val;
Laurent Viviera01af5e2007-09-24 11:10:56 +02004231 if (!test_cc(c->b, ctxt->eflags))
4232 c->dst.type = OP_NONE; /* no writeback */
Avi Kivity6aa8b732006-12-10 02:21:36 -08004233 break;
Gleb Natapovb2833e32009-04-12 13:36:30 +03004234 case 0x80 ... 0x8f: /* jnz rel, etc*/
Avi Kivity018a98d2007-11-27 19:30:56 +02004235 if (test_cc(c->b, ctxt->eflags))
Gleb Natapovb2833e32009-04-12 13:36:30 +03004236 jmp_rel(c, c->src.val);
Avi Kivity018a98d2007-11-27 19:30:56 +02004237 break;
Wei Yongjunee45b582010-08-06 17:10:07 +08004238 case 0x90 ... 0x9f: /* setcc r/m8 */
4239 c->dst.val = test_cc(c->b, ctxt->eflags);
4240 break;
Mohammed Gamal0934ac92009-08-23 14:24:24 +03004241 case 0xa0: /* push fs */
Takuya Yoshikawa4179bb02011-04-13 00:29:09 +09004242 rc = emulate_push_sreg(ctxt, ops, VCPU_SREG_FS);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03004243 break;
4244 case 0xa1: /* pop fs */
4245 rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_FS);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03004246 break;
Nitin A Kamble7de75242007-09-15 10:13:07 +03004247 case 0xa3:
4248 bt: /* bt */
Qing Hee4f8e032007-09-24 17:22:13 +08004249 c->dst.type = OP_NONE;
Laurent Viviere4e03de2007-09-18 11:52:50 +02004250 /* only subword offset */
4251 c->src.val &= (c->dst.bytes << 3) - 1;
Laurent Vivier05f086f2007-09-24 11:10:55 +02004252 emulate_2op_SrcV_nobyte("bt", c->src, c->dst, ctxt->eflags);
Nitin A Kamble7de75242007-09-15 10:13:07 +03004253 break;
Guillaume Thouvenin9bf8ea42008-12-04 14:30:13 +01004254 case 0xa4: /* shld imm8, r, r/m */
4255 case 0xa5: /* shld cl, r, r/m */
4256 emulate_2op_cl("shld", c->src2, c->src, c->dst, ctxt->eflags);
4257 break;
Mohammed Gamal0934ac92009-08-23 14:24:24 +03004258 case 0xa8: /* push gs */
Takuya Yoshikawa4179bb02011-04-13 00:29:09 +09004259 rc = emulate_push_sreg(ctxt, ops, VCPU_SREG_GS);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03004260 break;
4261 case 0xa9: /* pop gs */
4262 rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_GS);
Mohammed Gamal0934ac92009-08-23 14:24:24 +03004263 break;
Nitin A Kamble7de75242007-09-15 10:13:07 +03004264 case 0xab:
4265 bts: /* bts */
Laurent Vivier05f086f2007-09-24 11:10:55 +02004266 emulate_2op_SrcV_nobyte("bts", c->src, c->dst, ctxt->eflags);
Nitin A Kamble7de75242007-09-15 10:13:07 +03004267 break;
Guillaume Thouvenin9bf8ea42008-12-04 14:30:13 +01004268 case 0xac: /* shrd imm8, r, r/m */
4269 case 0xad: /* shrd cl, r, r/m */
4270 emulate_2op_cl("shrd", c->src2, c->src, c->dst, ctxt->eflags);
4271 break;
Glauber Costa2a7c5b82008-07-10 17:08:15 -03004272 case 0xae: /* clflush */
4273 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004274 case 0xb0 ... 0xb1: /* cmpxchg */
4275 /*
4276 * Save real source value, then compare EAX against
4277 * destination.
4278 */
Laurent Viviere4e03de2007-09-18 11:52:50 +02004279 c->src.orig_val = c->src.val;
4280 c->src.val = c->regs[VCPU_REGS_RAX];
Laurent Vivier05f086f2007-09-24 11:10:55 +02004281 emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
4282 if (ctxt->eflags & EFLG_ZF) {
Avi Kivity6aa8b732006-12-10 02:21:36 -08004283 /* Success: write back to memory. */
Laurent Viviere4e03de2007-09-18 11:52:50 +02004284 c->dst.val = c->src.orig_val;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004285 } else {
4286 /* Failure: write the value we saw to EAX. */
Laurent Viviere4e03de2007-09-18 11:52:50 +02004287 c->dst.type = OP_REG;
Avi Kivity1a6440a2010-08-01 12:35:10 +03004288 c->dst.addr.reg = (unsigned long *)&c->regs[VCPU_REGS_RAX];
Avi Kivity6aa8b732006-12-10 02:21:36 -08004289 }
4290 break;
Wei Yongjun09b5f4d2010-08-23 14:56:54 +08004291 case 0xb2: /* lss */
4292 rc = emulate_load_segment(ctxt, ops, VCPU_SREG_SS);
Wei Yongjun09b5f4d2010-08-23 14:56:54 +08004293 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004294 case 0xb3:
4295 btr: /* btr */
Laurent Vivier05f086f2007-09-24 11:10:55 +02004296 emulate_2op_SrcV_nobyte("btr", c->src, c->dst, ctxt->eflags);
Avi Kivity6aa8b732006-12-10 02:21:36 -08004297 break;
Wei Yongjun09b5f4d2010-08-23 14:56:54 +08004298 case 0xb4: /* lfs */
4299 rc = emulate_load_segment(ctxt, ops, VCPU_SREG_FS);
Wei Yongjun09b5f4d2010-08-23 14:56:54 +08004300 break;
4301 case 0xb5: /* lgs */
4302 rc = emulate_load_segment(ctxt, ops, VCPU_SREG_GS);
Wei Yongjun09b5f4d2010-08-23 14:56:54 +08004303 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004304 case 0xb6 ... 0xb7: /* movzx */
Laurent Viviere4e03de2007-09-18 11:52:50 +02004305 c->dst.bytes = c->op_bytes;
4306 c->dst.val = (c->d & ByteOp) ? (u8) c->src.val
4307 : (u16) c->src.val;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004308 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004309 case 0xba: /* Grp8 */
Laurent Viviere4e03de2007-09-18 11:52:50 +02004310 switch (c->modrm_reg & 3) {
Avi Kivity6aa8b732006-12-10 02:21:36 -08004311 case 0:
4312 goto bt;
4313 case 1:
4314 goto bts;
4315 case 2:
4316 goto btr;
4317 case 3:
4318 goto btc;
4319 }
4320 break;
Nitin A Kamble7de75242007-09-15 10:13:07 +03004321 case 0xbb:
4322 btc: /* btc */
Laurent Vivier05f086f2007-09-24 11:10:55 +02004323 emulate_2op_SrcV_nobyte("btc", c->src, c->dst, ctxt->eflags);
Nitin A Kamble7de75242007-09-15 10:13:07 +03004324 break;
Wei Yongjund9574a22010-08-10 13:48:22 +08004325 case 0xbc: { /* bsf */
4326 u8 zf;
4327 __asm__ ("bsf %2, %0; setz %1"
4328 : "=r"(c->dst.val), "=q"(zf)
4329 : "r"(c->src.val));
4330 ctxt->eflags &= ~X86_EFLAGS_ZF;
4331 if (zf) {
4332 ctxt->eflags |= X86_EFLAGS_ZF;
4333 c->dst.type = OP_NONE; /* Disable writeback. */
4334 }
4335 break;
4336 }
4337 case 0xbd: { /* bsr */
4338 u8 zf;
4339 __asm__ ("bsr %2, %0; setz %1"
4340 : "=r"(c->dst.val), "=q"(zf)
4341 : "r"(c->src.val));
4342 ctxt->eflags &= ~X86_EFLAGS_ZF;
4343 if (zf) {
4344 ctxt->eflags |= X86_EFLAGS_ZF;
4345 c->dst.type = OP_NONE; /* Disable writeback. */
4346 }
4347 break;
4348 }
Avi Kivity6aa8b732006-12-10 02:21:36 -08004349 case 0xbe ... 0xbf: /* movsx */
Laurent Viviere4e03de2007-09-18 11:52:50 +02004350 c->dst.bytes = c->op_bytes;
4351 c->dst.val = (c->d & ByteOp) ? (s8) c->src.val :
4352 (s16) c->src.val;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004353 break;
Wei Yongjun92f738a2010-08-17 09:19:34 +08004354 case 0xc0 ... 0xc1: /* xadd */
4355 emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags);
4356 /* Write back the register source. */
4357 c->src.val = c->dst.orig_val;
4358 write_register_operand(&c->src);
4359 break;
Sheng Yanga012e652007-10-15 14:24:20 +08004360 case 0xc3: /* movnti */
Laurent Viviere4e03de2007-09-18 11:52:50 +02004361 c->dst.bytes = c->op_bytes;
4362 c->dst.val = (c->op_bytes == 4) ? (u32) c->src.val :
4363 (u64) c->src.val;
Sheng Yanga012e652007-10-15 14:24:20 +08004364 break;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004365 case 0xc7: /* Grp9 (cmpxchg8b) */
Takuya Yoshikawa51187682011-05-02 02:29:17 +09004366 rc = em_grp9(ctxt);
Laurent Vivier8cdbd2c2007-09-24 11:10:54 +02004367 break;
Avi Kivity91269b82010-07-25 14:51:16 +03004368 default:
4369 goto cannot_emulate;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004370 }
Avi Kivity7d9ddae2010-08-30 17:12:28 +03004371
4372 if (rc != X86EMUL_CONTINUE)
4373 goto done;
4374
Avi Kivity6aa8b732006-12-10 02:21:36 -08004375 goto writeback;
4376
4377cannot_emulate:
Gleb Natapova0c0ab22011-03-28 16:57:49 +02004378 return EMULATION_FAILED;
Avi Kivity6aa8b732006-12-10 02:21:36 -08004379}