1 /******************************************************************************
4 * Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
6 * Copyright (c) 2005 Keir Fraser
8 * Linux coding style, mod r/m decoder, segment base fixes, real-mode
9 * privileged instructions:
11 * Copyright (C) 2006 Qumranet
12 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
14 * Avi Kivity <avi@qumranet.com>
15 * Yaniv Kamay <yaniv@qumranet.com>
17 * This work is licensed under the terms of the GNU GPL, version 2. See
18 * the COPYING file in the top-level directory.
20 * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
23 #include <linux/kvm_host.h>
24 #include "kvm_cache_regs.h"
25 #include <linux/module.h>
26 #include <asm/kvm_emulate.h>
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
40 /* Operand sizes: 8-bit operands or specified/overridden size. */
41 #define ByteOp (1<<0) /* 8-bit operands. */
42 /* Destination operand type. */
43 #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 */
49 #define DstImmUByte (7<<1) /* 8-bit unsigned immediate operand */
50 #define DstMask (7<<1)
51 /* Source operand type. */
52 #define SrcNone (0<<4) /* No source operand. */
53 #define SrcReg (1<<4) /* Register operand. */
54 #define SrcMem (2<<4) /* Memory operand. */
55 #define SrcMem16 (3<<4) /* Memory operand (16-bit). */
56 #define SrcMem32 (4<<4) /* Memory operand (32-bit). */
57 #define SrcImm (5<<4) /* Immediate operand. */
58 #define SrcImmByte (6<<4) /* 8-bit sign-extended immediate operand. */
59 #define SrcOne (7<<4) /* Implied '1' */
60 #define SrcImmUByte (8<<4) /* 8-bit unsigned immediate operand. */
61 #define SrcImmU (9<<4) /* Immediate operand, unsigned */
62 #define SrcSI (0xa<<4) /* Source is in the DS:RSI */
63 #define SrcImmFAddr (0xb<<4) /* Source is immediate far address */
64 #define SrcMemFAddr (0xc<<4) /* Source is far address in memory */
65 #define SrcAcc (0xd<<4) /* Source Accumulator */
66 #define SrcImmU16 (0xe<<4) /* Immediate operand, unsigned, 16 bits */
67 #define SrcMask (0xf<<4)
68 /* Generic ModRM decode. */
70 /* Destination is only written; never read. */
73 #define MemAbs (1<<11) /* Memory operand is absolute displacement */
74 #define String (1<<12) /* String instruction (rep capable) */
75 #define Stack (1<<13) /* Stack instruction (push/pop) */
76 #define GroupMask (7<<14) /* Opcode uses one of the group mechanisms */
77 #define Group (1<<14) /* Bits 3:5 of modrm byte extend opcode */
78 #define GroupDual (2<<14) /* Alternate decoding of mod == 3 */
79 #define Prefix (3<<14) /* Instruction varies with 66/f2/f3 prefix */
80 #define RMExt (4<<14) /* Opcode extension in ModRM r/m if mod == 3 */
81 #define Sse (1<<17) /* SSE Vector instruction */
83 #define Prot (1<<21) /* instruction generates #UD if not in prot-mode */
84 #define VendorSpecific (1<<22) /* Vendor specific instruction */
85 #define NoAccess (1<<23) /* Don't access memory (lea/invlpg/verr etc) */
86 #define Op3264 (1<<24) /* Operand is 64b in long mode, 32b otherwise */
87 #define Undefined (1<<25) /* No Such Instruction */
88 #define Lock (1<<26) /* lock prefix is allowed for the instruction */
89 #define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */
91 /* Source 2 operand type */
92 #define Src2None (0<<29)
93 #define Src2CL (1<<29)
94 #define Src2ImmByte (2<<29)
95 #define Src2One (3<<29)
96 #define Src2Imm (4<<29)
97 #define Src2Mask (7<<29)
100 #define X3(x...) X2(x), x
101 #define X4(x...) X2(x), X2(x)
102 #define X5(x...) X4(x), x
103 #define X6(x...) X4(x), X2(x)
104 #define X7(x...) X4(x), X3(x)
105 #define X8(x...) X4(x), X4(x)
106 #define X16(x...) X8(x), X8(x)
112 int (*execute
)(struct x86_emulate_ctxt
*ctxt
);
113 struct opcode
*group
;
114 struct group_dual
*gdual
;
115 struct gprefix
*gprefix
;
117 int (*check_perm
)(struct x86_emulate_ctxt
*ctxt
);
121 struct opcode mod012
[8];
122 struct opcode mod3
[8];
126 struct opcode pfx_no
;
127 struct opcode pfx_66
;
128 struct opcode pfx_f2
;
129 struct opcode pfx_f3
;
132 /* EFLAGS bit definitions. */
133 #define EFLG_ID (1<<21)
134 #define EFLG_VIP (1<<20)
135 #define EFLG_VIF (1<<19)
136 #define EFLG_AC (1<<18)
137 #define EFLG_VM (1<<17)
138 #define EFLG_RF (1<<16)
139 #define EFLG_IOPL (3<<12)
140 #define EFLG_NT (1<<14)
141 #define EFLG_OF (1<<11)
142 #define EFLG_DF (1<<10)
143 #define EFLG_IF (1<<9)
144 #define EFLG_TF (1<<8)
145 #define EFLG_SF (1<<7)
146 #define EFLG_ZF (1<<6)
147 #define EFLG_AF (1<<4)
148 #define EFLG_PF (1<<2)
149 #define EFLG_CF (1<<0)
151 #define EFLG_RESERVED_ZEROS_MASK 0xffc0802a
152 #define EFLG_RESERVED_ONE_MASK 2
155 * Instruction emulation:
156 * Most instructions are emulated directly via a fragment of inline assembly
157 * code. This allows us to save/restore EFLAGS and thus very easily pick up
158 * any modified flags.
161 #if defined(CONFIG_X86_64)
162 #define _LO32 "k" /* force 32-bit operand */
163 #define _STK "%%rsp" /* stack pointer */
164 #elif defined(__i386__)
165 #define _LO32 "" /* force 32-bit operand */
166 #define _STK "%%esp" /* stack pointer */
170 * These EFLAGS bits are restored from saved value during emulation, and
171 * any changes are written back to the saved value after emulation.
173 #define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF)
175 /* Before executing instruction: restore necessary bits in EFLAGS. */
176 #define _PRE_EFLAGS(_sav, _msk, _tmp) \
177 /* EFLAGS = (_sav & _msk) | (EFLAGS & ~_msk); _sav &= ~_msk; */ \
178 "movl %"_sav",%"_LO32 _tmp"; " \
181 "movl %"_msk",%"_LO32 _tmp"; " \
182 "andl %"_LO32 _tmp",("_STK"); " \
184 "notl %"_LO32 _tmp"; " \
185 "andl %"_LO32 _tmp",("_STK"); " \
186 "andl %"_LO32 _tmp","__stringify(BITS_PER_LONG/4)"("_STK"); " \
188 "orl %"_LO32 _tmp",("_STK"); " \
192 /* After executing instruction: write-back necessary bits in EFLAGS. */
193 #define _POST_EFLAGS(_sav, _msk, _tmp) \
194 /* _sav |= EFLAGS & _msk; */ \
197 "andl %"_msk",%"_LO32 _tmp"; " \
198 "orl %"_LO32 _tmp",%"_sav"; "
206 #define ____emulate_2op(_op, _src, _dst, _eflags, _x, _y, _suffix, _dsttype) \
208 __asm__ __volatile__ ( \
209 _PRE_EFLAGS("0", "4", "2") \
210 _op _suffix " %"_x"3,%1; " \
211 _POST_EFLAGS("0", "4", "2") \
212 : "=m" (_eflags), "+q" (*(_dsttype*)&(_dst).val),\
214 : _y ((_src).val), "i" (EFLAGS_MASK)); \
218 /* Raw emulation: instruction has two explicit operands. */
219 #define __emulate_2op_nobyte(_op,_src,_dst,_eflags,_wx,_wy,_lx,_ly,_qx,_qy) \
221 unsigned long _tmp; \
223 switch ((_dst).bytes) { \
225 ____emulate_2op(_op,_src,_dst,_eflags,_wx,_wy,"w",u16);\
228 ____emulate_2op(_op,_src,_dst,_eflags,_lx,_ly,"l",u32);\
231 ON64(____emulate_2op(_op,_src,_dst,_eflags,_qx,_qy,"q",u64)); \
236 #define __emulate_2op(_op,_src,_dst,_eflags,_bx,_by,_wx,_wy,_lx,_ly,_qx,_qy) \
238 unsigned long _tmp; \
239 switch ((_dst).bytes) { \
241 ____emulate_2op(_op,_src,_dst,_eflags,_bx,_by,"b",u8); \
244 __emulate_2op_nobyte(_op, _src, _dst, _eflags, \
245 _wx, _wy, _lx, _ly, _qx, _qy); \
250 /* Source operand is byte-sized and may be restricted to just %cl. */
251 #define emulate_2op_SrcB(_op, _src, _dst, _eflags) \
252 __emulate_2op(_op, _src, _dst, _eflags, \
253 "b", "c", "b", "c", "b", "c", "b", "c")
255 /* Source operand is byte, word, long or quad sized. */
256 #define emulate_2op_SrcV(_op, _src, _dst, _eflags) \
257 __emulate_2op(_op, _src, _dst, _eflags, \
258 "b", "q", "w", "r", _LO32, "r", "", "r")
260 /* Source operand is word, long or quad sized. */
261 #define emulate_2op_SrcV_nobyte(_op, _src, _dst, _eflags) \
262 __emulate_2op_nobyte(_op, _src, _dst, _eflags, \
263 "w", "r", _LO32, "r", "", "r")
265 /* Instruction has three operands and one operand is stored in ECX register */
266 #define __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, _suffix, _type) \
268 unsigned long _tmp; \
269 _type _clv = (_cl).val; \
270 _type _srcv = (_src).val; \
271 _type _dstv = (_dst).val; \
273 __asm__ __volatile__ ( \
274 _PRE_EFLAGS("0", "5", "2") \
275 _op _suffix " %4,%1 \n" \
276 _POST_EFLAGS("0", "5", "2") \
277 : "=m" (_eflags), "+r" (_dstv), "=&r" (_tmp) \
278 : "c" (_clv) , "r" (_srcv), "i" (EFLAGS_MASK) \
281 (_cl).val = (unsigned long) _clv; \
282 (_src).val = (unsigned long) _srcv; \
283 (_dst).val = (unsigned long) _dstv; \
286 #define emulate_2op_cl(_op, _cl, _src, _dst, _eflags) \
288 switch ((_dst).bytes) { \
290 __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \
291 "w", unsigned short); \
294 __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \
295 "l", unsigned int); \
298 ON64(__emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \
299 "q", unsigned long)); \
304 #define __emulate_1op(_op, _dst, _eflags, _suffix) \
306 unsigned long _tmp; \
308 __asm__ __volatile__ ( \
309 _PRE_EFLAGS("0", "3", "2") \
310 _op _suffix " %1; " \
311 _POST_EFLAGS("0", "3", "2") \
312 : "=m" (_eflags), "+m" ((_dst).val), \
314 : "i" (EFLAGS_MASK)); \
317 /* Instruction has only one explicit operand (no source operand). */
318 #define emulate_1op(_op, _dst, _eflags) \
320 switch ((_dst).bytes) { \
321 case 1: __emulate_1op(_op, _dst, _eflags, "b"); break; \
322 case 2: __emulate_1op(_op, _dst, _eflags, "w"); break; \
323 case 4: __emulate_1op(_op, _dst, _eflags, "l"); break; \
324 case 8: ON64(__emulate_1op(_op, _dst, _eflags, "q")); break; \
328 #define __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, _suffix) \
330 unsigned long _tmp; \
332 __asm__ __volatile__ ( \
333 _PRE_EFLAGS("0", "4", "1") \
334 _op _suffix " %5; " \
335 _POST_EFLAGS("0", "4", "1") \
336 : "=m" (_eflags), "=&r" (_tmp), \
337 "+a" (_rax), "+d" (_rdx) \
338 : "i" (EFLAGS_MASK), "m" ((_src).val), \
339 "a" (_rax), "d" (_rdx)); \
342 #define __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, _eflags, _suffix, _ex) \
344 unsigned long _tmp; \
346 __asm__ __volatile__ ( \
347 _PRE_EFLAGS("0", "5", "1") \
349 _op _suffix " %6; " \
351 _POST_EFLAGS("0", "5", "1") \
352 ".pushsection .fixup,\"ax\" \n\t" \
353 "3: movb $1, %4 \n\t" \
356 _ASM_EXTABLE(1b, 3b) \
357 : "=m" (_eflags), "=&r" (_tmp), \
358 "+a" (_rax), "+d" (_rdx), "+qm"(_ex) \
359 : "i" (EFLAGS_MASK), "m" ((_src).val), \
360 "a" (_rax), "d" (_rdx)); \
363 /* instruction has only one source operand, destination is implicit (e.g. mul, div, imul, idiv) */
364 #define emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags) \
366 switch((_src).bytes) { \
368 __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, \
372 __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, \
376 __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, \
380 ON64(__emulate_1op_rax_rdx(_op, _src, _rax, _rdx, \
386 #define emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, _eflags, _ex) \
388 switch((_src).bytes) { \
390 __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
391 _eflags, "b", _ex); \
394 __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
395 _eflags, "w", _ex); \
398 __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
399 _eflags, "l", _ex); \
402 __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
403 _eflags, "q", _ex)); \
408 /* Fetch next part of the instruction being emulated. */
409 #define insn_fetch(_type, _size, _eip) \
410 ({ unsigned long _x; \
411 rc = do_insn_fetch(ctxt, ops, (_eip), &_x, (_size)); \
412 if (rc != X86EMUL_CONTINUE) \
418 #define insn_fetch_arr(_arr, _size, _eip) \
419 ({ rc = do_insn_fetch(ctxt, ops, (_eip), _arr, (_size)); \
420 if (rc != X86EMUL_CONTINUE) \
425 static int emulator_check_intercept(struct x86_emulate_ctxt
*ctxt
,
426 enum x86_intercept intercept
,
427 enum x86_intercept_stage stage
)
429 struct x86_instruction_info info
= {
430 .intercept
= intercept
,
431 .rep_prefix
= ctxt
->decode
.rep_prefix
,
432 .modrm_mod
= ctxt
->decode
.modrm_mod
,
433 .modrm_reg
= ctxt
->decode
.modrm_reg
,
434 .modrm_rm
= ctxt
->decode
.modrm_rm
,
435 .src_val
= ctxt
->decode
.src
.val64
,
436 .src_bytes
= ctxt
->decode
.src
.bytes
,
437 .dst_bytes
= ctxt
->decode
.dst
.bytes
,
438 .ad_bytes
= ctxt
->decode
.ad_bytes
,
439 .next_rip
= ctxt
->eip
,
442 return ctxt
->ops
->intercept(ctxt
, &info
, stage
);
445 static inline unsigned long ad_mask(struct decode_cache
*c
)
447 return (1UL << (c
->ad_bytes
<< 3)) - 1;
450 /* Access/update address held in a register, based on addressing mode. */
451 static inline unsigned long
452 address_mask(struct decode_cache
*c
, unsigned long reg
)
454 if (c
->ad_bytes
== sizeof(unsigned long))
457 return reg
& ad_mask(c
);
460 static inline unsigned long
461 register_address(struct decode_cache
*c
, unsigned long reg
)
463 return address_mask(c
, reg
);
467 register_address_increment(struct decode_cache
*c
, unsigned long *reg
, int inc
)
469 if (c
->ad_bytes
== sizeof(unsigned long))
472 *reg
= (*reg
& ~ad_mask(c
)) | ((*reg
+ inc
) & ad_mask(c
));
475 static inline void jmp_rel(struct decode_cache
*c
, int rel
)
477 register_address_increment(c
, &c
->eip
, rel
);
480 static u32
desc_limit_scaled(struct desc_struct
*desc
)
482 u32 limit
= get_desc_limit(desc
);
484 return desc
->g
? (limit
<< 12) | 0xfff : limit
;
487 static void set_seg_override(struct decode_cache
*c
, int seg
)
489 c
->has_seg_override
= true;
490 c
->seg_override
= seg
;
493 static unsigned long seg_base(struct x86_emulate_ctxt
*ctxt
,
494 struct x86_emulate_ops
*ops
, int seg
)
496 if (ctxt
->mode
== X86EMUL_MODE_PROT64
&& seg
< VCPU_SREG_FS
)
499 return ops
->get_cached_segment_base(ctxt
, seg
);
502 static unsigned seg_override(struct x86_emulate_ctxt
*ctxt
,
503 struct decode_cache
*c
)
505 if (!c
->has_seg_override
)
508 return c
->seg_override
;
511 static int emulate_exception(struct x86_emulate_ctxt
*ctxt
, int vec
,
512 u32 error
, bool valid
)
514 ctxt
->exception
.vector
= vec
;
515 ctxt
->exception
.error_code
= error
;
516 ctxt
->exception
.error_code_valid
= valid
;
517 return X86EMUL_PROPAGATE_FAULT
;
520 static int emulate_db(struct x86_emulate_ctxt
*ctxt
)
522 return emulate_exception(ctxt
, DB_VECTOR
, 0, false);
525 static int emulate_gp(struct x86_emulate_ctxt
*ctxt
, int err
)
527 return emulate_exception(ctxt
, GP_VECTOR
, err
, true);
530 static int emulate_ss(struct x86_emulate_ctxt
*ctxt
, int err
)
532 return emulate_exception(ctxt
, SS_VECTOR
, err
, true);
535 static int emulate_ud(struct x86_emulate_ctxt
*ctxt
)
537 return emulate_exception(ctxt
, UD_VECTOR
, 0, false);
540 static int emulate_ts(struct x86_emulate_ctxt
*ctxt
, int err
)
542 return emulate_exception(ctxt
, TS_VECTOR
, err
, true);
545 static int emulate_de(struct x86_emulate_ctxt
*ctxt
)
547 return emulate_exception(ctxt
, DE_VECTOR
, 0, false);
550 static int emulate_nm(struct x86_emulate_ctxt
*ctxt
)
552 return emulate_exception(ctxt
, NM_VECTOR
, 0, false);
555 static u16
get_segment_selector(struct x86_emulate_ctxt
*ctxt
, unsigned seg
)
558 struct desc_struct desc
;
560 ctxt
->ops
->get_segment(ctxt
, &selector
, &desc
, NULL
, seg
);
564 static void set_segment_selector(struct x86_emulate_ctxt
*ctxt
, u16 selector
,
569 struct desc_struct desc
;
571 ctxt
->ops
->get_segment(ctxt
, &dummy
, &desc
, &base3
, seg
);
572 ctxt
->ops
->set_segment(ctxt
, selector
, &desc
, base3
, seg
);
575 static int __linearize(struct x86_emulate_ctxt
*ctxt
,
576 struct segmented_address addr
,
577 unsigned size
, bool write
, bool fetch
,
580 struct decode_cache
*c
= &ctxt
->decode
;
581 struct desc_struct desc
;
588 la
= seg_base(ctxt
, ctxt
->ops
, addr
.seg
) + addr
.ea
;
589 switch (ctxt
->mode
) {
590 case X86EMUL_MODE_REAL
:
592 case X86EMUL_MODE_PROT64
:
593 if (((signed long)la
<< 16) >> 16 != la
)
594 return emulate_gp(ctxt
, 0);
597 usable
= ctxt
->ops
->get_segment(ctxt
, &sel
, &desc
, NULL
,
601 /* code segment or read-only data segment */
602 if (((desc
.type
& 8) || !(desc
.type
& 2)) && write
)
604 /* unreadable code segment */
605 if (!fetch
&& (desc
.type
& 8) && !(desc
.type
& 2))
607 lim
= desc_limit_scaled(&desc
);
608 if ((desc
.type
& 8) || !(desc
.type
& 4)) {
609 /* expand-up segment */
610 if (addr
.ea
> lim
|| (u32
)(addr
.ea
+ size
- 1) > lim
)
613 /* exapand-down segment */
614 if (addr
.ea
<= lim
|| (u32
)(addr
.ea
+ size
- 1) <= lim
)
616 lim
= desc
.d
? 0xffffffff : 0xffff;
617 if (addr
.ea
> lim
|| (u32
)(addr
.ea
+ size
- 1) > lim
)
620 cpl
= ctxt
->ops
->cpl(ctxt
);
623 if (!(desc
.type
& 8)) {
627 } else if ((desc
.type
& 8) && !(desc
.type
& 4)) {
628 /* nonconforming code segment */
631 } else if ((desc
.type
& 8) && (desc
.type
& 4)) {
632 /* conforming code segment */
638 if (fetch
? ctxt
->mode
!= X86EMUL_MODE_PROT64
: c
->ad_bytes
!= 8)
641 return X86EMUL_CONTINUE
;
643 if (addr
.seg
== VCPU_SREG_SS
)
644 return emulate_ss(ctxt
, addr
.seg
);
646 return emulate_gp(ctxt
, addr
.seg
);
649 static int linearize(struct x86_emulate_ctxt
*ctxt
,
650 struct segmented_address addr
,
651 unsigned size
, bool write
,
654 return __linearize(ctxt
, addr
, size
, write
, false, linear
);
658 static int segmented_read_std(struct x86_emulate_ctxt
*ctxt
,
659 struct segmented_address addr
,
666 rc
= linearize(ctxt
, addr
, size
, false, &linear
);
667 if (rc
!= X86EMUL_CONTINUE
)
669 return ctxt
->ops
->read_std(ctxt
, linear
, data
, size
, &ctxt
->exception
);
672 static int do_fetch_insn_byte(struct x86_emulate_ctxt
*ctxt
,
673 struct x86_emulate_ops
*ops
,
674 unsigned long eip
, u8
*dest
)
676 struct fetch_cache
*fc
= &ctxt
->decode
.fetch
;
680 if (eip
== fc
->end
) {
681 unsigned long linear
;
682 struct segmented_address addr
= { .seg
=VCPU_SREG_CS
, .ea
=eip
};
683 cur_size
= fc
->end
- fc
->start
;
684 size
= min(15UL - cur_size
, PAGE_SIZE
- offset_in_page(eip
));
685 rc
= __linearize(ctxt
, addr
, size
, false, true, &linear
);
686 if (rc
!= X86EMUL_CONTINUE
)
688 rc
= ops
->fetch(ctxt
, linear
, fc
->data
+ cur_size
,
689 size
, &ctxt
->exception
);
690 if (rc
!= X86EMUL_CONTINUE
)
694 *dest
= fc
->data
[eip
- fc
->start
];
695 return X86EMUL_CONTINUE
;
698 static int do_insn_fetch(struct x86_emulate_ctxt
*ctxt
,
699 struct x86_emulate_ops
*ops
,
700 unsigned long eip
, void *dest
, unsigned size
)
704 /* x86 instructions are limited to 15 bytes. */
705 if (eip
+ size
- ctxt
->eip
> 15)
706 return X86EMUL_UNHANDLEABLE
;
708 rc
= do_fetch_insn_byte(ctxt
, ops
, eip
++, dest
++);
709 if (rc
!= X86EMUL_CONTINUE
)
712 return X86EMUL_CONTINUE
;
716 * Given the 'reg' portion of a ModRM byte, and a register block, return a
717 * pointer into the block that addresses the relevant register.
718 * @highbyte_regs specifies whether to decode AH,CH,DH,BH.
720 static void *decode_register(u8 modrm_reg
, unsigned long *regs
,
725 p
= ®s
[modrm_reg
];
726 if (highbyte_regs
&& modrm_reg
>= 4 && modrm_reg
< 8)
727 p
= (unsigned char *)®s
[modrm_reg
& 3] + 1;
731 static int read_descriptor(struct x86_emulate_ctxt
*ctxt
,
732 struct segmented_address addr
,
733 u16
*size
, unsigned long *address
, int op_bytes
)
740 rc
= segmented_read_std(ctxt
, addr
, size
, 2);
741 if (rc
!= X86EMUL_CONTINUE
)
744 rc
= segmented_read_std(ctxt
, addr
, address
, op_bytes
);
748 static int test_cc(unsigned int condition
, unsigned int flags
)
752 switch ((condition
& 15) >> 1) {
754 rc
|= (flags
& EFLG_OF
);
756 case 1: /* b/c/nae */
757 rc
|= (flags
& EFLG_CF
);
760 rc
|= (flags
& EFLG_ZF
);
763 rc
|= (flags
& (EFLG_CF
|EFLG_ZF
));
766 rc
|= (flags
& EFLG_SF
);
769 rc
|= (flags
& EFLG_PF
);
772 rc
|= (flags
& EFLG_ZF
);
775 rc
|= (!(flags
& EFLG_SF
) != !(flags
& EFLG_OF
));
779 /* Odd condition identifiers (lsb == 1) have inverted sense. */
780 return (!!rc
^ (condition
& 1));
783 static void fetch_register_operand(struct operand
*op
)
787 op
->val
= *(u8
*)op
->addr
.reg
;
790 op
->val
= *(u16
*)op
->addr
.reg
;
793 op
->val
= *(u32
*)op
->addr
.reg
;
796 op
->val
= *(u64
*)op
->addr
.reg
;
801 static void read_sse_reg(struct x86_emulate_ctxt
*ctxt
, sse128_t
*data
, int reg
)
803 ctxt
->ops
->get_fpu(ctxt
);
805 case 0: asm("movdqu %%xmm0, %0" : "=m"(*data
)); break;
806 case 1: asm("movdqu %%xmm1, %0" : "=m"(*data
)); break;
807 case 2: asm("movdqu %%xmm2, %0" : "=m"(*data
)); break;
808 case 3: asm("movdqu %%xmm3, %0" : "=m"(*data
)); break;
809 case 4: asm("movdqu %%xmm4, %0" : "=m"(*data
)); break;
810 case 5: asm("movdqu %%xmm5, %0" : "=m"(*data
)); break;
811 case 6: asm("movdqu %%xmm6, %0" : "=m"(*data
)); break;
812 case 7: asm("movdqu %%xmm7, %0" : "=m"(*data
)); break;
814 case 8: asm("movdqu %%xmm8, %0" : "=m"(*data
)); break;
815 case 9: asm("movdqu %%xmm9, %0" : "=m"(*data
)); break;
816 case 10: asm("movdqu %%xmm10, %0" : "=m"(*data
)); break;
817 case 11: asm("movdqu %%xmm11, %0" : "=m"(*data
)); break;
818 case 12: asm("movdqu %%xmm12, %0" : "=m"(*data
)); break;
819 case 13: asm("movdqu %%xmm13, %0" : "=m"(*data
)); break;
820 case 14: asm("movdqu %%xmm14, %0" : "=m"(*data
)); break;
821 case 15: asm("movdqu %%xmm15, %0" : "=m"(*data
)); break;
825 ctxt
->ops
->put_fpu(ctxt
);
828 static void write_sse_reg(struct x86_emulate_ctxt
*ctxt
, sse128_t
*data
,
831 ctxt
->ops
->get_fpu(ctxt
);
833 case 0: asm("movdqu %0, %%xmm0" : : "m"(*data
)); break;
834 case 1: asm("movdqu %0, %%xmm1" : : "m"(*data
)); break;
835 case 2: asm("movdqu %0, %%xmm2" : : "m"(*data
)); break;
836 case 3: asm("movdqu %0, %%xmm3" : : "m"(*data
)); break;
837 case 4: asm("movdqu %0, %%xmm4" : : "m"(*data
)); break;
838 case 5: asm("movdqu %0, %%xmm5" : : "m"(*data
)); break;
839 case 6: asm("movdqu %0, %%xmm6" : : "m"(*data
)); break;
840 case 7: asm("movdqu %0, %%xmm7" : : "m"(*data
)); break;
842 case 8: asm("movdqu %0, %%xmm8" : : "m"(*data
)); break;
843 case 9: asm("movdqu %0, %%xmm9" : : "m"(*data
)); break;
844 case 10: asm("movdqu %0, %%xmm10" : : "m"(*data
)); break;
845 case 11: asm("movdqu %0, %%xmm11" : : "m"(*data
)); break;
846 case 12: asm("movdqu %0, %%xmm12" : : "m"(*data
)); break;
847 case 13: asm("movdqu %0, %%xmm13" : : "m"(*data
)); break;
848 case 14: asm("movdqu %0, %%xmm14" : : "m"(*data
)); break;
849 case 15: asm("movdqu %0, %%xmm15" : : "m"(*data
)); break;
853 ctxt
->ops
->put_fpu(ctxt
);
856 static void decode_register_operand(struct x86_emulate_ctxt
*ctxt
,
858 struct decode_cache
*c
,
861 unsigned reg
= c
->modrm_reg
;
862 int highbyte_regs
= c
->rex_prefix
== 0;
865 reg
= (c
->b
& 7) | ((c
->rex_prefix
& 1) << 3);
871 read_sse_reg(ctxt
, &op
->vec_val
, reg
);
876 if ((c
->d
& ByteOp
) && !inhibit_bytereg
) {
877 op
->addr
.reg
= decode_register(reg
, c
->regs
, highbyte_regs
);
880 op
->addr
.reg
= decode_register(reg
, c
->regs
, 0);
881 op
->bytes
= c
->op_bytes
;
883 fetch_register_operand(op
);
884 op
->orig_val
= op
->val
;
887 static int decode_modrm(struct x86_emulate_ctxt
*ctxt
,
888 struct x86_emulate_ops
*ops
,
891 struct decode_cache
*c
= &ctxt
->decode
;
893 int index_reg
= 0, base_reg
= 0, scale
;
894 int rc
= X86EMUL_CONTINUE
;
898 c
->modrm_reg
= (c
->rex_prefix
& 4) << 1; /* REX.R */
899 index_reg
= (c
->rex_prefix
& 2) << 2; /* REX.X */
900 c
->modrm_rm
= base_reg
= (c
->rex_prefix
& 1) << 3; /* REG.B */
903 c
->modrm
= insn_fetch(u8
, 1, c
->eip
);
904 c
->modrm_mod
|= (c
->modrm
& 0xc0) >> 6;
905 c
->modrm_reg
|= (c
->modrm
& 0x38) >> 3;
906 c
->modrm_rm
|= (c
->modrm
& 0x07);
907 c
->modrm_seg
= VCPU_SREG_DS
;
909 if (c
->modrm_mod
== 3) {
911 op
->bytes
= (c
->d
& ByteOp
) ? 1 : c
->op_bytes
;
912 op
->addr
.reg
= decode_register(c
->modrm_rm
,
913 c
->regs
, c
->d
& ByteOp
);
917 op
->addr
.xmm
= c
->modrm_rm
;
918 read_sse_reg(ctxt
, &op
->vec_val
, c
->modrm_rm
);
921 fetch_register_operand(op
);
927 if (c
->ad_bytes
== 2) {
928 unsigned bx
= c
->regs
[VCPU_REGS_RBX
];
929 unsigned bp
= c
->regs
[VCPU_REGS_RBP
];
930 unsigned si
= c
->regs
[VCPU_REGS_RSI
];
931 unsigned di
= c
->regs
[VCPU_REGS_RDI
];
933 /* 16-bit ModR/M decode. */
934 switch (c
->modrm_mod
) {
936 if (c
->modrm_rm
== 6)
937 modrm_ea
+= insn_fetch(u16
, 2, c
->eip
);
940 modrm_ea
+= insn_fetch(s8
, 1, c
->eip
);
943 modrm_ea
+= insn_fetch(u16
, 2, c
->eip
);
946 switch (c
->modrm_rm
) {
966 if (c
->modrm_mod
!= 0)
973 if (c
->modrm_rm
== 2 || c
->modrm_rm
== 3 ||
974 (c
->modrm_rm
== 6 && c
->modrm_mod
!= 0))
975 c
->modrm_seg
= VCPU_SREG_SS
;
976 modrm_ea
= (u16
)modrm_ea
;
978 /* 32/64-bit ModR/M decode. */
979 if ((c
->modrm_rm
& 7) == 4) {
980 sib
= insn_fetch(u8
, 1, c
->eip
);
981 index_reg
|= (sib
>> 3) & 7;
985 if ((base_reg
& 7) == 5 && c
->modrm_mod
== 0)
986 modrm_ea
+= insn_fetch(s32
, 4, c
->eip
);
988 modrm_ea
+= c
->regs
[base_reg
];
990 modrm_ea
+= c
->regs
[index_reg
] << scale
;
991 } else if ((c
->modrm_rm
& 7) == 5 && c
->modrm_mod
== 0) {
992 if (ctxt
->mode
== X86EMUL_MODE_PROT64
)
995 modrm_ea
+= c
->regs
[c
->modrm_rm
];
996 switch (c
->modrm_mod
) {
998 if (c
->modrm_rm
== 5)
999 modrm_ea
+= insn_fetch(s32
, 4, c
->eip
);
1002 modrm_ea
+= insn_fetch(s8
, 1, c
->eip
);
1005 modrm_ea
+= insn_fetch(s32
, 4, c
->eip
);
1009 op
->addr
.mem
.ea
= modrm_ea
;
1014 static int decode_abs(struct x86_emulate_ctxt
*ctxt
,
1015 struct x86_emulate_ops
*ops
,
1018 struct decode_cache
*c
= &ctxt
->decode
;
1019 int rc
= X86EMUL_CONTINUE
;
1022 switch (c
->ad_bytes
) {
1024 op
->addr
.mem
.ea
= insn_fetch(u16
, 2, c
->eip
);
1027 op
->addr
.mem
.ea
= insn_fetch(u32
, 4, c
->eip
);
1030 op
->addr
.mem
.ea
= insn_fetch(u64
, 8, c
->eip
);
1037 static void fetch_bit_operand(struct decode_cache
*c
)
1041 if (c
->dst
.type
== OP_MEM
&& c
->src
.type
== OP_REG
) {
1042 mask
= ~(c
->dst
.bytes
* 8 - 1);
1044 if (c
->src
.bytes
== 2)
1045 sv
= (s16
)c
->src
.val
& (s16
)mask
;
1046 else if (c
->src
.bytes
== 4)
1047 sv
= (s32
)c
->src
.val
& (s32
)mask
;
1049 c
->dst
.addr
.mem
.ea
+= (sv
>> 3);
1052 /* only subword offset */
1053 c
->src
.val
&= (c
->dst
.bytes
<< 3) - 1;
1056 static int read_emulated(struct x86_emulate_ctxt
*ctxt
,
1057 struct x86_emulate_ops
*ops
,
1058 unsigned long addr
, void *dest
, unsigned size
)
1061 struct read_cache
*mc
= &ctxt
->decode
.mem_read
;
1064 int n
= min(size
, 8u);
1066 if (mc
->pos
< mc
->end
)
1069 rc
= ops
->read_emulated(ctxt
, addr
, mc
->data
+ mc
->end
, n
,
1071 if (rc
!= X86EMUL_CONTINUE
)
1076 memcpy(dest
, mc
->data
+ mc
->pos
, n
);
1081 return X86EMUL_CONTINUE
;
1084 static int segmented_read(struct x86_emulate_ctxt
*ctxt
,
1085 struct segmented_address addr
,
1092 rc
= linearize(ctxt
, addr
, size
, false, &linear
);
1093 if (rc
!= X86EMUL_CONTINUE
)
1095 return read_emulated(ctxt
, ctxt
->ops
, linear
, data
, size
);
1098 static int segmented_write(struct x86_emulate_ctxt
*ctxt
,
1099 struct segmented_address addr
,
1106 rc
= linearize(ctxt
, addr
, size
, true, &linear
);
1107 if (rc
!= X86EMUL_CONTINUE
)
1109 return ctxt
->ops
->write_emulated(ctxt
, linear
, data
, size
,
1113 static int segmented_cmpxchg(struct x86_emulate_ctxt
*ctxt
,
1114 struct segmented_address addr
,
1115 const void *orig_data
, const void *data
,
1121 rc
= linearize(ctxt
, addr
, size
, true, &linear
);
1122 if (rc
!= X86EMUL_CONTINUE
)
1124 return ctxt
->ops
->cmpxchg_emulated(ctxt
, linear
, orig_data
, data
,
1125 size
, &ctxt
->exception
);
1128 static int pio_in_emulated(struct x86_emulate_ctxt
*ctxt
,
1129 struct x86_emulate_ops
*ops
,
1130 unsigned int size
, unsigned short port
,
1133 struct read_cache
*rc
= &ctxt
->decode
.io_read
;
1135 if (rc
->pos
== rc
->end
) { /* refill pio read ahead */
1136 struct decode_cache
*c
= &ctxt
->decode
;
1137 unsigned int in_page
, n
;
1138 unsigned int count
= c
->rep_prefix
?
1139 address_mask(c
, c
->regs
[VCPU_REGS_RCX
]) : 1;
1140 in_page
= (ctxt
->eflags
& EFLG_DF
) ?
1141 offset_in_page(c
->regs
[VCPU_REGS_RDI
]) :
1142 PAGE_SIZE
- offset_in_page(c
->regs
[VCPU_REGS_RDI
]);
1143 n
= min(min(in_page
, (unsigned int)sizeof(rc
->data
)) / size
,
1147 rc
->pos
= rc
->end
= 0;
1148 if (!ops
->pio_in_emulated(ctxt
, size
, port
, rc
->data
, n
))
1153 memcpy(dest
, rc
->data
+ rc
->pos
, size
);
1158 static void get_descriptor_table_ptr(struct x86_emulate_ctxt
*ctxt
,
1159 struct x86_emulate_ops
*ops
,
1160 u16 selector
, struct desc_ptr
*dt
)
1162 if (selector
& 1 << 2) {
1163 struct desc_struct desc
;
1166 memset (dt
, 0, sizeof *dt
);
1167 if (!ops
->get_segment(ctxt
, &sel
, &desc
, NULL
, VCPU_SREG_LDTR
))
1170 dt
->size
= desc_limit_scaled(&desc
); /* what if limit > 65535? */
1171 dt
->address
= get_desc_base(&desc
);
1173 ops
->get_gdt(ctxt
, dt
);
1176 /* allowed just for 8 bytes segments */
1177 static int read_segment_descriptor(struct x86_emulate_ctxt
*ctxt
,
1178 struct x86_emulate_ops
*ops
,
1179 u16 selector
, struct desc_struct
*desc
)
1182 u16 index
= selector
>> 3;
1186 get_descriptor_table_ptr(ctxt
, ops
, selector
, &dt
);
1188 if (dt
.size
< index
* 8 + 7)
1189 return emulate_gp(ctxt
, selector
& 0xfffc);
1190 addr
= dt
.address
+ index
* 8;
1191 ret
= ops
->read_std(ctxt
, addr
, desc
, sizeof *desc
, &ctxt
->exception
);
1196 /* allowed just for 8 bytes segments */
1197 static int write_segment_descriptor(struct x86_emulate_ctxt
*ctxt
,
1198 struct x86_emulate_ops
*ops
,
1199 u16 selector
, struct desc_struct
*desc
)
1202 u16 index
= selector
>> 3;
1206 get_descriptor_table_ptr(ctxt
, ops
, selector
, &dt
);
1208 if (dt
.size
< index
* 8 + 7)
1209 return emulate_gp(ctxt
, selector
& 0xfffc);
1211 addr
= dt
.address
+ index
* 8;
1212 ret
= ops
->write_std(ctxt
, addr
, desc
, sizeof *desc
, &ctxt
->exception
);
1217 /* Does not support long mode */
1218 static int load_segment_descriptor(struct x86_emulate_ctxt
*ctxt
,
1219 struct x86_emulate_ops
*ops
,
1220 u16 selector
, int seg
)
1222 struct desc_struct seg_desc
;
1224 unsigned err_vec
= GP_VECTOR
;
1226 bool null_selector
= !(selector
& ~0x3); /* 0000-0003 are null */
1229 memset(&seg_desc
, 0, sizeof seg_desc
);
1231 if ((seg
<= VCPU_SREG_GS
&& ctxt
->mode
== X86EMUL_MODE_VM86
)
1232 || ctxt
->mode
== X86EMUL_MODE_REAL
) {
1233 /* set real mode segment descriptor */
1234 set_desc_base(&seg_desc
, selector
<< 4);
1235 set_desc_limit(&seg_desc
, 0xffff);
1242 /* NULL selector is not valid for TR, CS and SS */
1243 if ((seg
== VCPU_SREG_CS
|| seg
== VCPU_SREG_SS
|| seg
== VCPU_SREG_TR
)
1247 /* TR should be in GDT only */
1248 if (seg
== VCPU_SREG_TR
&& (selector
& (1 << 2)))
1251 if (null_selector
) /* for NULL selector skip all following checks */
1254 ret
= read_segment_descriptor(ctxt
, ops
, selector
, &seg_desc
);
1255 if (ret
!= X86EMUL_CONTINUE
)
1258 err_code
= selector
& 0xfffc;
1259 err_vec
= GP_VECTOR
;
1261 /* can't load system descriptor into segment selecor */
1262 if (seg
<= VCPU_SREG_GS
&& !seg_desc
.s
)
1266 err_vec
= (seg
== VCPU_SREG_SS
) ? SS_VECTOR
: NP_VECTOR
;
1272 cpl
= ops
->cpl(ctxt
);
1277 * segment is not a writable data segment or segment
1278 * selector's RPL != CPL or segment selector's RPL != CPL
1280 if (rpl
!= cpl
|| (seg_desc
.type
& 0xa) != 0x2 || dpl
!= cpl
)
1284 if (!(seg_desc
.type
& 8))
1287 if (seg_desc
.type
& 4) {
1293 if (rpl
> cpl
|| dpl
!= cpl
)
1296 /* CS(RPL) <- CPL */
1297 selector
= (selector
& 0xfffc) | cpl
;
1300 if (seg_desc
.s
|| (seg_desc
.type
!= 1 && seg_desc
.type
!= 9))
1303 case VCPU_SREG_LDTR
:
1304 if (seg_desc
.s
|| seg_desc
.type
!= 2)
1307 default: /* DS, ES, FS, or GS */
1309 * segment is not a data or readable code segment or
1310 * ((segment is a data or nonconforming code segment)
1311 * and (both RPL and CPL > DPL))
1313 if ((seg_desc
.type
& 0xa) == 0x8 ||
1314 (((seg_desc
.type
& 0xc) != 0xc) &&
1315 (rpl
> dpl
&& cpl
> dpl
)))
1321 /* mark segment as accessed */
1323 ret
= write_segment_descriptor(ctxt
, ops
, selector
, &seg_desc
);
1324 if (ret
!= X86EMUL_CONTINUE
)
1328 ops
->set_segment(ctxt
, selector
, &seg_desc
, 0, seg
);
1329 return X86EMUL_CONTINUE
;
1331 emulate_exception(ctxt
, err_vec
, err_code
, true);
1332 return X86EMUL_PROPAGATE_FAULT
;
1335 static void write_register_operand(struct operand
*op
)
1337 /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */
1338 switch (op
->bytes
) {
1340 *(u8
*)op
->addr
.reg
= (u8
)op
->val
;
1343 *(u16
*)op
->addr
.reg
= (u16
)op
->val
;
1346 *op
->addr
.reg
= (u32
)op
->val
;
1347 break; /* 64b: zero-extend */
1349 *op
->addr
.reg
= op
->val
;
1354 static int writeback(struct x86_emulate_ctxt
*ctxt
)
1357 struct decode_cache
*c
= &ctxt
->decode
;
1359 switch (c
->dst
.type
) {
1361 write_register_operand(&c
->dst
);
1365 rc
= segmented_cmpxchg(ctxt
,
1371 rc
= segmented_write(ctxt
,
1375 if (rc
!= X86EMUL_CONTINUE
)
1379 write_sse_reg(ctxt
, &c
->dst
.vec_val
, c
->dst
.addr
.xmm
);
1387 return X86EMUL_CONTINUE
;
1390 static int em_push(struct x86_emulate_ctxt
*ctxt
)
1392 struct decode_cache
*c
= &ctxt
->decode
;
1393 struct segmented_address addr
;
1395 register_address_increment(c
, &c
->regs
[VCPU_REGS_RSP
], -c
->op_bytes
);
1396 addr
.ea
= register_address(c
, c
->regs
[VCPU_REGS_RSP
]);
1397 addr
.seg
= VCPU_SREG_SS
;
1399 /* Disable writeback. */
1400 c
->dst
.type
= OP_NONE
;
1401 return segmented_write(ctxt
, addr
, &c
->src
.val
, c
->op_bytes
);
1404 static int emulate_pop(struct x86_emulate_ctxt
*ctxt
,
1405 struct x86_emulate_ops
*ops
,
1406 void *dest
, int len
)
1408 struct decode_cache
*c
= &ctxt
->decode
;
1410 struct segmented_address addr
;
1412 addr
.ea
= register_address(c
, c
->regs
[VCPU_REGS_RSP
]);
1413 addr
.seg
= VCPU_SREG_SS
;
1414 rc
= segmented_read(ctxt
, addr
, dest
, len
);
1415 if (rc
!= X86EMUL_CONTINUE
)
1418 register_address_increment(c
, &c
->regs
[VCPU_REGS_RSP
], len
);
1422 static int em_pop(struct x86_emulate_ctxt
*ctxt
)
1424 struct decode_cache
*c
= &ctxt
->decode
;
1426 return emulate_pop(ctxt
, ctxt
->ops
, &c
->dst
.val
, c
->op_bytes
);
1429 static int emulate_popf(struct x86_emulate_ctxt
*ctxt
,
1430 struct x86_emulate_ops
*ops
,
1431 void *dest
, int len
)
1434 unsigned long val
, change_mask
;
1435 int iopl
= (ctxt
->eflags
& X86_EFLAGS_IOPL
) >> IOPL_SHIFT
;
1436 int cpl
= ops
->cpl(ctxt
);
1438 rc
= emulate_pop(ctxt
, ops
, &val
, len
);
1439 if (rc
!= X86EMUL_CONTINUE
)
1442 change_mask
= EFLG_CF
| EFLG_PF
| EFLG_AF
| EFLG_ZF
| EFLG_SF
| EFLG_OF
1443 | EFLG_TF
| EFLG_DF
| EFLG_NT
| EFLG_RF
| EFLG_AC
| EFLG_ID
;
1445 switch(ctxt
->mode
) {
1446 case X86EMUL_MODE_PROT64
:
1447 case X86EMUL_MODE_PROT32
:
1448 case X86EMUL_MODE_PROT16
:
1450 change_mask
|= EFLG_IOPL
;
1452 change_mask
|= EFLG_IF
;
1454 case X86EMUL_MODE_VM86
:
1456 return emulate_gp(ctxt
, 0);
1457 change_mask
|= EFLG_IF
;
1459 default: /* real mode */
1460 change_mask
|= (EFLG_IOPL
| EFLG_IF
);
1464 *(unsigned long *)dest
=
1465 (ctxt
->eflags
& ~change_mask
) | (val
& change_mask
);
1470 static int em_popf(struct x86_emulate_ctxt
*ctxt
)
1472 struct decode_cache
*c
= &ctxt
->decode
;
1474 c
->dst
.type
= OP_REG
;
1475 c
->dst
.addr
.reg
= &ctxt
->eflags
;
1476 c
->dst
.bytes
= c
->op_bytes
;
1477 return emulate_popf(ctxt
, ctxt
->ops
, &c
->dst
.val
, c
->op_bytes
);
1480 static int emulate_push_sreg(struct x86_emulate_ctxt
*ctxt
,
1481 struct x86_emulate_ops
*ops
, int seg
)
1483 struct decode_cache
*c
= &ctxt
->decode
;
1485 c
->src
.val
= get_segment_selector(ctxt
, seg
);
1487 return em_push(ctxt
);
1490 static int emulate_pop_sreg(struct x86_emulate_ctxt
*ctxt
,
1491 struct x86_emulate_ops
*ops
, int seg
)
1493 struct decode_cache
*c
= &ctxt
->decode
;
1494 unsigned long selector
;
1497 rc
= emulate_pop(ctxt
, ops
, &selector
, c
->op_bytes
);
1498 if (rc
!= X86EMUL_CONTINUE
)
1501 rc
= load_segment_descriptor(ctxt
, ops
, (u16
)selector
, seg
);
1505 static int em_pusha(struct x86_emulate_ctxt
*ctxt
)
1507 struct decode_cache
*c
= &ctxt
->decode
;
1508 unsigned long old_esp
= c
->regs
[VCPU_REGS_RSP
];
1509 int rc
= X86EMUL_CONTINUE
;
1510 int reg
= VCPU_REGS_RAX
;
1512 while (reg
<= VCPU_REGS_RDI
) {
1513 (reg
== VCPU_REGS_RSP
) ?
1514 (c
->src
.val
= old_esp
) : (c
->src
.val
= c
->regs
[reg
]);
1517 if (rc
!= X86EMUL_CONTINUE
)
1526 static int em_pushf(struct x86_emulate_ctxt
*ctxt
)
1528 struct decode_cache
*c
= &ctxt
->decode
;
1530 c
->src
.val
= (unsigned long)ctxt
->eflags
;
1531 return em_push(ctxt
);
1534 static int em_popa(struct x86_emulate_ctxt
*ctxt
)
1536 struct decode_cache
*c
= &ctxt
->decode
;
1537 int rc
= X86EMUL_CONTINUE
;
1538 int reg
= VCPU_REGS_RDI
;
1540 while (reg
>= VCPU_REGS_RAX
) {
1541 if (reg
== VCPU_REGS_RSP
) {
1542 register_address_increment(c
, &c
->regs
[VCPU_REGS_RSP
],
1547 rc
= emulate_pop(ctxt
, ctxt
->ops
, &c
->regs
[reg
], c
->op_bytes
);
1548 if (rc
!= X86EMUL_CONTINUE
)
1555 int emulate_int_real(struct x86_emulate_ctxt
*ctxt
,
1556 struct x86_emulate_ops
*ops
, int irq
)
1558 struct decode_cache
*c
= &ctxt
->decode
;
1565 /* TODO: Add limit checks */
1566 c
->src
.val
= ctxt
->eflags
;
1568 if (rc
!= X86EMUL_CONTINUE
)
1571 ctxt
->eflags
&= ~(EFLG_IF
| EFLG_TF
| EFLG_AC
);
1573 c
->src
.val
= get_segment_selector(ctxt
, VCPU_SREG_CS
);
1575 if (rc
!= X86EMUL_CONTINUE
)
1578 c
->src
.val
= c
->eip
;
1580 if (rc
!= X86EMUL_CONTINUE
)
1583 ops
->get_idt(ctxt
, &dt
);
1585 eip_addr
= dt
.address
+ (irq
<< 2);
1586 cs_addr
= dt
.address
+ (irq
<< 2) + 2;
1588 rc
= ops
->read_std(ctxt
, cs_addr
, &cs
, 2, &ctxt
->exception
);
1589 if (rc
!= X86EMUL_CONTINUE
)
1592 rc
= ops
->read_std(ctxt
, eip_addr
, &eip
, 2, &ctxt
->exception
);
1593 if (rc
!= X86EMUL_CONTINUE
)
1596 rc
= load_segment_descriptor(ctxt
, ops
, cs
, VCPU_SREG_CS
);
1597 if (rc
!= X86EMUL_CONTINUE
)
1605 static int emulate_int(struct x86_emulate_ctxt
*ctxt
,
1606 struct x86_emulate_ops
*ops
, int irq
)
1608 switch(ctxt
->mode
) {
1609 case X86EMUL_MODE_REAL
:
1610 return emulate_int_real(ctxt
, ops
, irq
);
1611 case X86EMUL_MODE_VM86
:
1612 case X86EMUL_MODE_PROT16
:
1613 case X86EMUL_MODE_PROT32
:
1614 case X86EMUL_MODE_PROT64
:
1616 /* Protected mode interrupts unimplemented yet */
1617 return X86EMUL_UNHANDLEABLE
;
1621 static int emulate_iret_real(struct x86_emulate_ctxt
*ctxt
,
1622 struct x86_emulate_ops
*ops
)
1624 struct decode_cache
*c
= &ctxt
->decode
;
1625 int rc
= X86EMUL_CONTINUE
;
1626 unsigned long temp_eip
= 0;
1627 unsigned long temp_eflags
= 0;
1628 unsigned long cs
= 0;
1629 unsigned long mask
= EFLG_CF
| EFLG_PF
| EFLG_AF
| EFLG_ZF
| EFLG_SF
| EFLG_TF
|
1630 EFLG_IF
| EFLG_DF
| EFLG_OF
| EFLG_IOPL
| EFLG_NT
| EFLG_RF
|
1631 EFLG_AC
| EFLG_ID
| (1 << 1); /* Last one is the reserved bit */
1632 unsigned long vm86_mask
= EFLG_VM
| EFLG_VIF
| EFLG_VIP
;
1634 /* TODO: Add stack limit check */
1636 rc
= emulate_pop(ctxt
, ops
, &temp_eip
, c
->op_bytes
);
1638 if (rc
!= X86EMUL_CONTINUE
)
1641 if (temp_eip
& ~0xffff)
1642 return emulate_gp(ctxt
, 0);
1644 rc
= emulate_pop(ctxt
, ops
, &cs
, c
->op_bytes
);
1646 if (rc
!= X86EMUL_CONTINUE
)
1649 rc
= emulate_pop(ctxt
, ops
, &temp_eflags
, c
->op_bytes
);
1651 if (rc
!= X86EMUL_CONTINUE
)
1654 rc
= load_segment_descriptor(ctxt
, ops
, (u16
)cs
, VCPU_SREG_CS
);
1656 if (rc
!= X86EMUL_CONTINUE
)
1662 if (c
->op_bytes
== 4)
1663 ctxt
->eflags
= ((temp_eflags
& mask
) | (ctxt
->eflags
& vm86_mask
));
1664 else if (c
->op_bytes
== 2) {
1665 ctxt
->eflags
&= ~0xffff;
1666 ctxt
->eflags
|= temp_eflags
;
1669 ctxt
->eflags
&= ~EFLG_RESERVED_ZEROS_MASK
; /* Clear reserved zeros */
1670 ctxt
->eflags
|= EFLG_RESERVED_ONE_MASK
;
1675 static inline int emulate_iret(struct x86_emulate_ctxt
*ctxt
,
1676 struct x86_emulate_ops
* ops
)
1678 switch(ctxt
->mode
) {
1679 case X86EMUL_MODE_REAL
:
1680 return emulate_iret_real(ctxt
, ops
);
1681 case X86EMUL_MODE_VM86
:
1682 case X86EMUL_MODE_PROT16
:
1683 case X86EMUL_MODE_PROT32
:
1684 case X86EMUL_MODE_PROT64
:
1686 /* iret from protected mode unimplemented yet */
1687 return X86EMUL_UNHANDLEABLE
;
1691 static inline int emulate_grp1a(struct x86_emulate_ctxt
*ctxt
,
1692 struct x86_emulate_ops
*ops
)
1694 struct decode_cache
*c
= &ctxt
->decode
;
1696 return emulate_pop(ctxt
, ops
, &c
->dst
.val
, c
->dst
.bytes
);
1699 static inline void emulate_grp2(struct x86_emulate_ctxt
*ctxt
)
1701 struct decode_cache
*c
= &ctxt
->decode
;
1702 switch (c
->modrm_reg
) {
1704 emulate_2op_SrcB("rol", c
->src
, c
->dst
, ctxt
->eflags
);
1707 emulate_2op_SrcB("ror", c
->src
, c
->dst
, ctxt
->eflags
);
1710 emulate_2op_SrcB("rcl", c
->src
, c
->dst
, ctxt
->eflags
);
1713 emulate_2op_SrcB("rcr", c
->src
, c
->dst
, ctxt
->eflags
);
1715 case 4: /* sal/shl */
1716 case 6: /* sal/shl */
1717 emulate_2op_SrcB("sal", c
->src
, c
->dst
, ctxt
->eflags
);
1720 emulate_2op_SrcB("shr", c
->src
, c
->dst
, ctxt
->eflags
);
1723 emulate_2op_SrcB("sar", c
->src
, c
->dst
, ctxt
->eflags
);
1728 static inline int emulate_grp3(struct x86_emulate_ctxt
*ctxt
,
1729 struct x86_emulate_ops
*ops
)
1731 struct decode_cache
*c
= &ctxt
->decode
;
1732 unsigned long *rax
= &c
->regs
[VCPU_REGS_RAX
];
1733 unsigned long *rdx
= &c
->regs
[VCPU_REGS_RDX
];
1736 switch (c
->modrm_reg
) {
1737 case 0 ... 1: /* test */
1738 emulate_2op_SrcV("test", c
->src
, c
->dst
, ctxt
->eflags
);
1741 c
->dst
.val
= ~c
->dst
.val
;
1744 emulate_1op("neg", c
->dst
, ctxt
->eflags
);
1747 emulate_1op_rax_rdx("mul", c
->src
, *rax
, *rdx
, ctxt
->eflags
);
1750 emulate_1op_rax_rdx("imul", c
->src
, *rax
, *rdx
, ctxt
->eflags
);
1753 emulate_1op_rax_rdx_ex("div", c
->src
, *rax
, *rdx
,
1757 emulate_1op_rax_rdx_ex("idiv", c
->src
, *rax
, *rdx
,
1761 return X86EMUL_UNHANDLEABLE
;
1764 return emulate_de(ctxt
);
1765 return X86EMUL_CONTINUE
;
1768 static int emulate_grp45(struct x86_emulate_ctxt
*ctxt
)
1770 struct decode_cache
*c
= &ctxt
->decode
;
1771 int rc
= X86EMUL_CONTINUE
;
1773 switch (c
->modrm_reg
) {
1775 emulate_1op("inc", c
->dst
, ctxt
->eflags
);
1778 emulate_1op("dec", c
->dst
, ctxt
->eflags
);
1780 case 2: /* call near abs */ {
1783 c
->eip
= c
->src
.val
;
1784 c
->src
.val
= old_eip
;
1788 case 4: /* jmp abs */
1789 c
->eip
= c
->src
.val
;
1798 static inline int emulate_grp9(struct x86_emulate_ctxt
*ctxt
,
1799 struct x86_emulate_ops
*ops
)
1801 struct decode_cache
*c
= &ctxt
->decode
;
1802 u64 old
= c
->dst
.orig_val64
;
1804 if (((u32
) (old
>> 0) != (u32
) c
->regs
[VCPU_REGS_RAX
]) ||
1805 ((u32
) (old
>> 32) != (u32
) c
->regs
[VCPU_REGS_RDX
])) {
1806 c
->regs
[VCPU_REGS_RAX
] = (u32
) (old
>> 0);
1807 c
->regs
[VCPU_REGS_RDX
] = (u32
) (old
>> 32);
1808 ctxt
->eflags
&= ~EFLG_ZF
;
1810 c
->dst
.val64
= ((u64
)c
->regs
[VCPU_REGS_RCX
] << 32) |
1811 (u32
) c
->regs
[VCPU_REGS_RBX
];
1813 ctxt
->eflags
|= EFLG_ZF
;
1815 return X86EMUL_CONTINUE
;
1818 static int emulate_ret_far(struct x86_emulate_ctxt
*ctxt
,
1819 struct x86_emulate_ops
*ops
)
1821 struct decode_cache
*c
= &ctxt
->decode
;
1825 rc
= emulate_pop(ctxt
, ops
, &c
->eip
, c
->op_bytes
);
1826 if (rc
!= X86EMUL_CONTINUE
)
1828 if (c
->op_bytes
== 4)
1829 c
->eip
= (u32
)c
->eip
;
1830 rc
= emulate_pop(ctxt
, ops
, &cs
, c
->op_bytes
);
1831 if (rc
!= X86EMUL_CONTINUE
)
1833 rc
= load_segment_descriptor(ctxt
, ops
, (u16
)cs
, VCPU_SREG_CS
);
1837 static int emulate_load_segment(struct x86_emulate_ctxt
*ctxt
,
1838 struct x86_emulate_ops
*ops
, int seg
)
1840 struct decode_cache
*c
= &ctxt
->decode
;
1844 memcpy(&sel
, c
->src
.valptr
+ c
->op_bytes
, 2);
1846 rc
= load_segment_descriptor(ctxt
, ops
, sel
, seg
);
1847 if (rc
!= X86EMUL_CONTINUE
)
1850 c
->dst
.val
= c
->src
.val
;
1855 setup_syscalls_segments(struct x86_emulate_ctxt
*ctxt
,
1856 struct x86_emulate_ops
*ops
, struct desc_struct
*cs
,
1857 struct desc_struct
*ss
)
1861 memset(cs
, 0, sizeof(struct desc_struct
));
1862 ops
->get_segment(ctxt
, &selector
, cs
, NULL
, VCPU_SREG_CS
);
1863 memset(ss
, 0, sizeof(struct desc_struct
));
1865 cs
->l
= 0; /* will be adjusted later */
1866 set_desc_base(cs
, 0); /* flat segment */
1867 cs
->g
= 1; /* 4kb granularity */
1868 set_desc_limit(cs
, 0xfffff); /* 4GB limit */
1869 cs
->type
= 0x0b; /* Read, Execute, Accessed */
1871 cs
->dpl
= 0; /* will be adjusted later */
1875 set_desc_base(ss
, 0); /* flat segment */
1876 set_desc_limit(ss
, 0xfffff); /* 4GB limit */
1877 ss
->g
= 1; /* 4kb granularity */
1879 ss
->type
= 0x03; /* Read/Write, Accessed */
1880 ss
->d
= 1; /* 32bit stack segment */
1886 emulate_syscall(struct x86_emulate_ctxt
*ctxt
, struct x86_emulate_ops
*ops
)
1888 struct decode_cache
*c
= &ctxt
->decode
;
1889 struct desc_struct cs
, ss
;
1894 /* syscall is not available in real mode */
1895 if (ctxt
->mode
== X86EMUL_MODE_REAL
||
1896 ctxt
->mode
== X86EMUL_MODE_VM86
)
1897 return emulate_ud(ctxt
);
1899 ops
->get_msr(ctxt
, MSR_EFER
, &efer
);
1900 setup_syscalls_segments(ctxt
, ops
, &cs
, &ss
);
1902 ops
->get_msr(ctxt
, MSR_STAR
, &msr_data
);
1904 cs_sel
= (u16
)(msr_data
& 0xfffc);
1905 ss_sel
= (u16
)(msr_data
+ 8);
1907 if (efer
& EFER_LMA
) {
1911 ops
->set_segment(ctxt
, cs_sel
, &cs
, 0, VCPU_SREG_CS
);
1912 ops
->set_segment(ctxt
, ss_sel
, &ss
, 0, VCPU_SREG_SS
);
1914 c
->regs
[VCPU_REGS_RCX
] = c
->eip
;
1915 if (efer
& EFER_LMA
) {
1916 #ifdef CONFIG_X86_64
1917 c
->regs
[VCPU_REGS_R11
] = ctxt
->eflags
& ~EFLG_RF
;
1920 ctxt
->mode
== X86EMUL_MODE_PROT64
?
1921 MSR_LSTAR
: MSR_CSTAR
, &msr_data
);
1924 ops
->get_msr(ctxt
, MSR_SYSCALL_MASK
, &msr_data
);
1925 ctxt
->eflags
&= ~(msr_data
| EFLG_RF
);
1929 ops
->get_msr(ctxt
, MSR_STAR
, &msr_data
);
1930 c
->eip
= (u32
)msr_data
;
1932 ctxt
->eflags
&= ~(EFLG_VM
| EFLG_IF
| EFLG_RF
);
1935 return X86EMUL_CONTINUE
;
1939 emulate_sysenter(struct x86_emulate_ctxt
*ctxt
, struct x86_emulate_ops
*ops
)
1941 struct decode_cache
*c
= &ctxt
->decode
;
1942 struct desc_struct cs
, ss
;
1947 ctxt
->ops
->get_msr(ctxt
, MSR_EFER
, &efer
);
1948 /* inject #GP if in real mode */
1949 if (ctxt
->mode
== X86EMUL_MODE_REAL
)
1950 return emulate_gp(ctxt
, 0);
1952 /* XXX sysenter/sysexit have not been tested in 64bit mode.
1953 * Therefore, we inject an #UD.
1955 if (ctxt
->mode
== X86EMUL_MODE_PROT64
)
1956 return emulate_ud(ctxt
);
1958 setup_syscalls_segments(ctxt
, ops
, &cs
, &ss
);
1960 ops
->get_msr(ctxt
, MSR_IA32_SYSENTER_CS
, &msr_data
);
1961 switch (ctxt
->mode
) {
1962 case X86EMUL_MODE_PROT32
:
1963 if ((msr_data
& 0xfffc) == 0x0)
1964 return emulate_gp(ctxt
, 0);
1966 case X86EMUL_MODE_PROT64
:
1967 if (msr_data
== 0x0)
1968 return emulate_gp(ctxt
, 0);
1972 ctxt
->eflags
&= ~(EFLG_VM
| EFLG_IF
| EFLG_RF
);
1973 cs_sel
= (u16
)msr_data
;
1974 cs_sel
&= ~SELECTOR_RPL_MASK
;
1975 ss_sel
= cs_sel
+ 8;
1976 ss_sel
&= ~SELECTOR_RPL_MASK
;
1977 if (ctxt
->mode
== X86EMUL_MODE_PROT64
|| (efer
& EFER_LMA
)) {
1982 ops
->set_segment(ctxt
, cs_sel
, &cs
, 0, VCPU_SREG_CS
);
1983 ops
->set_segment(ctxt
, ss_sel
, &ss
, 0, VCPU_SREG_SS
);
1985 ops
->get_msr(ctxt
, MSR_IA32_SYSENTER_EIP
, &msr_data
);
1988 ops
->get_msr(ctxt
, MSR_IA32_SYSENTER_ESP
, &msr_data
);
1989 c
->regs
[VCPU_REGS_RSP
] = msr_data
;
1991 return X86EMUL_CONTINUE
;
1995 emulate_sysexit(struct x86_emulate_ctxt
*ctxt
, struct x86_emulate_ops
*ops
)
1997 struct decode_cache
*c
= &ctxt
->decode
;
1998 struct desc_struct cs
, ss
;
2003 /* inject #GP if in real mode or Virtual 8086 mode */
2004 if (ctxt
->mode
== X86EMUL_MODE_REAL
||
2005 ctxt
->mode
== X86EMUL_MODE_VM86
)
2006 return emulate_gp(ctxt
, 0);
2008 setup_syscalls_segments(ctxt
, ops
, &cs
, &ss
);
2010 if ((c
->rex_prefix
& 0x8) != 0x0)
2011 usermode
= X86EMUL_MODE_PROT64
;
2013 usermode
= X86EMUL_MODE_PROT32
;
2017 ops
->get_msr(ctxt
, MSR_IA32_SYSENTER_CS
, &msr_data
);
2019 case X86EMUL_MODE_PROT32
:
2020 cs_sel
= (u16
)(msr_data
+ 16);
2021 if ((msr_data
& 0xfffc) == 0x0)
2022 return emulate_gp(ctxt
, 0);
2023 ss_sel
= (u16
)(msr_data
+ 24);
2025 case X86EMUL_MODE_PROT64
:
2026 cs_sel
= (u16
)(msr_data
+ 32);
2027 if (msr_data
== 0x0)
2028 return emulate_gp(ctxt
, 0);
2029 ss_sel
= cs_sel
+ 8;
2034 cs_sel
|= SELECTOR_RPL_MASK
;
2035 ss_sel
|= SELECTOR_RPL_MASK
;
2037 ops
->set_segment(ctxt
, cs_sel
, &cs
, 0, VCPU_SREG_CS
);
2038 ops
->set_segment(ctxt
, ss_sel
, &ss
, 0, VCPU_SREG_SS
);
2040 c
->eip
= c
->regs
[VCPU_REGS_RDX
];
2041 c
->regs
[VCPU_REGS_RSP
] = c
->regs
[VCPU_REGS_RCX
];
2043 return X86EMUL_CONTINUE
;
2046 static bool emulator_bad_iopl(struct x86_emulate_ctxt
*ctxt
,
2047 struct x86_emulate_ops
*ops
)
2050 if (ctxt
->mode
== X86EMUL_MODE_REAL
)
2052 if (ctxt
->mode
== X86EMUL_MODE_VM86
)
2054 iopl
= (ctxt
->eflags
& X86_EFLAGS_IOPL
) >> IOPL_SHIFT
;
2055 return ops
->cpl(ctxt
) > iopl
;
2058 static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt
*ctxt
,
2059 struct x86_emulate_ops
*ops
,
2062 struct desc_struct tr_seg
;
2065 u16 tr
, io_bitmap_ptr
, perm
, bit_idx
= port
& 0x7;
2066 unsigned mask
= (1 << len
) - 1;
2069 ops
->get_segment(ctxt
, &tr
, &tr_seg
, &base3
, VCPU_SREG_TR
);
2072 if (desc_limit_scaled(&tr_seg
) < 103)
2074 base
= get_desc_base(&tr_seg
);
2075 #ifdef CONFIG_X86_64
2076 base
|= ((u64
)base3
) << 32;
2078 r
= ops
->read_std(ctxt
, base
+ 102, &io_bitmap_ptr
, 2, NULL
);
2079 if (r
!= X86EMUL_CONTINUE
)
2081 if (io_bitmap_ptr
+ port
/8 > desc_limit_scaled(&tr_seg
))
2083 r
= ops
->read_std(ctxt
, base
+ io_bitmap_ptr
+ port
/8, &perm
, 2, NULL
);
2084 if (r
!= X86EMUL_CONTINUE
)
2086 if ((perm
>> bit_idx
) & mask
)
2091 static bool emulator_io_permited(struct x86_emulate_ctxt
*ctxt
,
2092 struct x86_emulate_ops
*ops
,
2098 if (emulator_bad_iopl(ctxt
, ops
))
2099 if (!emulator_io_port_access_allowed(ctxt
, ops
, port
, len
))
2102 ctxt
->perm_ok
= true;
2107 static void save_state_to_tss16(struct x86_emulate_ctxt
*ctxt
,
2108 struct x86_emulate_ops
*ops
,
2109 struct tss_segment_16
*tss
)
2111 struct decode_cache
*c
= &ctxt
->decode
;
2114 tss
->flag
= ctxt
->eflags
;
2115 tss
->ax
= c
->regs
[VCPU_REGS_RAX
];
2116 tss
->cx
= c
->regs
[VCPU_REGS_RCX
];
2117 tss
->dx
= c
->regs
[VCPU_REGS_RDX
];
2118 tss
->bx
= c
->regs
[VCPU_REGS_RBX
];
2119 tss
->sp
= c
->regs
[VCPU_REGS_RSP
];
2120 tss
->bp
= c
->regs
[VCPU_REGS_RBP
];
2121 tss
->si
= c
->regs
[VCPU_REGS_RSI
];
2122 tss
->di
= c
->regs
[VCPU_REGS_RDI
];
2124 tss
->es
= get_segment_selector(ctxt
, VCPU_SREG_ES
);
2125 tss
->cs
= get_segment_selector(ctxt
, VCPU_SREG_CS
);
2126 tss
->ss
= get_segment_selector(ctxt
, VCPU_SREG_SS
);
2127 tss
->ds
= get_segment_selector(ctxt
, VCPU_SREG_DS
);
2128 tss
->ldt
= get_segment_selector(ctxt
, VCPU_SREG_LDTR
);
2131 static int load_state_from_tss16(struct x86_emulate_ctxt
*ctxt
,
2132 struct x86_emulate_ops
*ops
,
2133 struct tss_segment_16
*tss
)
2135 struct decode_cache
*c
= &ctxt
->decode
;
2139 ctxt
->eflags
= tss
->flag
| 2;
2140 c
->regs
[VCPU_REGS_RAX
] = tss
->ax
;
2141 c
->regs
[VCPU_REGS_RCX
] = tss
->cx
;
2142 c
->regs
[VCPU_REGS_RDX
] = tss
->dx
;
2143 c
->regs
[VCPU_REGS_RBX
] = tss
->bx
;
2144 c
->regs
[VCPU_REGS_RSP
] = tss
->sp
;
2145 c
->regs
[VCPU_REGS_RBP
] = tss
->bp
;
2146 c
->regs
[VCPU_REGS_RSI
] = tss
->si
;
2147 c
->regs
[VCPU_REGS_RDI
] = tss
->di
;
2150 * SDM says that segment selectors are loaded before segment
2153 set_segment_selector(ctxt
, tss
->ldt
, VCPU_SREG_LDTR
);
2154 set_segment_selector(ctxt
, tss
->es
, VCPU_SREG_ES
);
2155 set_segment_selector(ctxt
, tss
->cs
, VCPU_SREG_CS
);
2156 set_segment_selector(ctxt
, tss
->ss
, VCPU_SREG_SS
);
2157 set_segment_selector(ctxt
, tss
->ds
, VCPU_SREG_DS
);
2160 * Now load segment descriptors. If fault happenes at this stage
2161 * it is handled in a context of new task
2163 ret
= load_segment_descriptor(ctxt
, ops
, tss
->ldt
, VCPU_SREG_LDTR
);
2164 if (ret
!= X86EMUL_CONTINUE
)
2166 ret
= load_segment_descriptor(ctxt
, ops
, tss
->es
, VCPU_SREG_ES
);
2167 if (ret
!= X86EMUL_CONTINUE
)
2169 ret
= load_segment_descriptor(ctxt
, ops
, tss
->cs
, VCPU_SREG_CS
);
2170 if (ret
!= X86EMUL_CONTINUE
)
2172 ret
= load_segment_descriptor(ctxt
, ops
, tss
->ss
, VCPU_SREG_SS
);
2173 if (ret
!= X86EMUL_CONTINUE
)
2175 ret
= load_segment_descriptor(ctxt
, ops
, tss
->ds
, VCPU_SREG_DS
);
2176 if (ret
!= X86EMUL_CONTINUE
)
2179 return X86EMUL_CONTINUE
;
2182 static int task_switch_16(struct x86_emulate_ctxt
*ctxt
,
2183 struct x86_emulate_ops
*ops
,
2184 u16 tss_selector
, u16 old_tss_sel
,
2185 ulong old_tss_base
, struct desc_struct
*new_desc
)
2187 struct tss_segment_16 tss_seg
;
2189 u32 new_tss_base
= get_desc_base(new_desc
);
2191 ret
= ops
->read_std(ctxt
, old_tss_base
, &tss_seg
, sizeof tss_seg
,
2193 if (ret
!= X86EMUL_CONTINUE
)
2194 /* FIXME: need to provide precise fault address */
2197 save_state_to_tss16(ctxt
, ops
, &tss_seg
);
2199 ret
= ops
->write_std(ctxt
, old_tss_base
, &tss_seg
, sizeof tss_seg
,
2201 if (ret
!= X86EMUL_CONTINUE
)
2202 /* FIXME: need to provide precise fault address */
2205 ret
= ops
->read_std(ctxt
, new_tss_base
, &tss_seg
, sizeof tss_seg
,
2207 if (ret
!= X86EMUL_CONTINUE
)
2208 /* FIXME: need to provide precise fault address */
2211 if (old_tss_sel
!= 0xffff) {
2212 tss_seg
.prev_task_link
= old_tss_sel
;
2214 ret
= ops
->write_std(ctxt
, new_tss_base
,
2215 &tss_seg
.prev_task_link
,
2216 sizeof tss_seg
.prev_task_link
,
2218 if (ret
!= X86EMUL_CONTINUE
)
2219 /* FIXME: need to provide precise fault address */
2223 return load_state_from_tss16(ctxt
, ops
, &tss_seg
);
2226 static void save_state_to_tss32(struct x86_emulate_ctxt
*ctxt
,
2227 struct x86_emulate_ops
*ops
,
2228 struct tss_segment_32
*tss
)
2230 struct decode_cache
*c
= &ctxt
->decode
;
2232 tss
->cr3
= ops
->get_cr(ctxt
, 3);
2234 tss
->eflags
= ctxt
->eflags
;
2235 tss
->eax
= c
->regs
[VCPU_REGS_RAX
];
2236 tss
->ecx
= c
->regs
[VCPU_REGS_RCX
];
2237 tss
->edx
= c
->regs
[VCPU_REGS_RDX
];
2238 tss
->ebx
= c
->regs
[VCPU_REGS_RBX
];
2239 tss
->esp
= c
->regs
[VCPU_REGS_RSP
];
2240 tss
->ebp
= c
->regs
[VCPU_REGS_RBP
];
2241 tss
->esi
= c
->regs
[VCPU_REGS_RSI
];
2242 tss
->edi
= c
->regs
[VCPU_REGS_RDI
];
2244 tss
->es
= get_segment_selector(ctxt
, VCPU_SREG_ES
);
2245 tss
->cs
= get_segment_selector(ctxt
, VCPU_SREG_CS
);
2246 tss
->ss
= get_segment_selector(ctxt
, VCPU_SREG_SS
);
2247 tss
->ds
= get_segment_selector(ctxt
, VCPU_SREG_DS
);
2248 tss
->fs
= get_segment_selector(ctxt
, VCPU_SREG_FS
);
2249 tss
->gs
= get_segment_selector(ctxt
, VCPU_SREG_GS
);
2250 tss
->ldt_selector
= get_segment_selector(ctxt
, VCPU_SREG_LDTR
);
2253 static int load_state_from_tss32(struct x86_emulate_ctxt
*ctxt
,
2254 struct x86_emulate_ops
*ops
,
2255 struct tss_segment_32
*tss
)
2257 struct decode_cache
*c
= &ctxt
->decode
;
2260 if (ops
->set_cr(ctxt
, 3, tss
->cr3
))
2261 return emulate_gp(ctxt
, 0);
2263 ctxt
->eflags
= tss
->eflags
| 2;
2264 c
->regs
[VCPU_REGS_RAX
] = tss
->eax
;
2265 c
->regs
[VCPU_REGS_RCX
] = tss
->ecx
;
2266 c
->regs
[VCPU_REGS_RDX
] = tss
->edx
;
2267 c
->regs
[VCPU_REGS_RBX
] = tss
->ebx
;
2268 c
->regs
[VCPU_REGS_RSP
] = tss
->esp
;
2269 c
->regs
[VCPU_REGS_RBP
] = tss
->ebp
;
2270 c
->regs
[VCPU_REGS_RSI
] = tss
->esi
;
2271 c
->regs
[VCPU_REGS_RDI
] = tss
->edi
;
2274 * SDM says that segment selectors are loaded before segment
2277 set_segment_selector(ctxt
, tss
->ldt_selector
, VCPU_SREG_LDTR
);
2278 set_segment_selector(ctxt
, tss
->es
, VCPU_SREG_ES
);
2279 set_segment_selector(ctxt
, tss
->cs
, VCPU_SREG_CS
);
2280 set_segment_selector(ctxt
, tss
->ss
, VCPU_SREG_SS
);
2281 set_segment_selector(ctxt
, tss
->ds
, VCPU_SREG_DS
);
2282 set_segment_selector(ctxt
, tss
->fs
, VCPU_SREG_FS
);
2283 set_segment_selector(ctxt
, tss
->gs
, VCPU_SREG_GS
);
2286 * Now load segment descriptors. If fault happenes at this stage
2287 * it is handled in a context of new task
2289 ret
= load_segment_descriptor(ctxt
, ops
, tss
->ldt_selector
, VCPU_SREG_LDTR
);
2290 if (ret
!= X86EMUL_CONTINUE
)
2292 ret
= load_segment_descriptor(ctxt
, ops
, tss
->es
, VCPU_SREG_ES
);
2293 if (ret
!= X86EMUL_CONTINUE
)
2295 ret
= load_segment_descriptor(ctxt
, ops
, tss
->cs
, VCPU_SREG_CS
);
2296 if (ret
!= X86EMUL_CONTINUE
)
2298 ret
= load_segment_descriptor(ctxt
, ops
, tss
->ss
, VCPU_SREG_SS
);
2299 if (ret
!= X86EMUL_CONTINUE
)
2301 ret
= load_segment_descriptor(ctxt
, ops
, tss
->ds
, VCPU_SREG_DS
);
2302 if (ret
!= X86EMUL_CONTINUE
)
2304 ret
= load_segment_descriptor(ctxt
, ops
, tss
->fs
, VCPU_SREG_FS
);
2305 if (ret
!= X86EMUL_CONTINUE
)
2307 ret
= load_segment_descriptor(ctxt
, ops
, tss
->gs
, VCPU_SREG_GS
);
2308 if (ret
!= X86EMUL_CONTINUE
)
2311 return X86EMUL_CONTINUE
;
2314 static int task_switch_32(struct x86_emulate_ctxt
*ctxt
,
2315 struct x86_emulate_ops
*ops
,
2316 u16 tss_selector
, u16 old_tss_sel
,
2317 ulong old_tss_base
, struct desc_struct
*new_desc
)
2319 struct tss_segment_32 tss_seg
;
2321 u32 new_tss_base
= get_desc_base(new_desc
);
2323 ret
= ops
->read_std(ctxt
, old_tss_base
, &tss_seg
, sizeof tss_seg
,
2325 if (ret
!= X86EMUL_CONTINUE
)
2326 /* FIXME: need to provide precise fault address */
2329 save_state_to_tss32(ctxt
, ops
, &tss_seg
);
2331 ret
= ops
->write_std(ctxt
, old_tss_base
, &tss_seg
, sizeof tss_seg
,
2333 if (ret
!= X86EMUL_CONTINUE
)
2334 /* FIXME: need to provide precise fault address */
2337 ret
= ops
->read_std(ctxt
, new_tss_base
, &tss_seg
, sizeof tss_seg
,
2339 if (ret
!= X86EMUL_CONTINUE
)
2340 /* FIXME: need to provide precise fault address */
2343 if (old_tss_sel
!= 0xffff) {
2344 tss_seg
.prev_task_link
= old_tss_sel
;
2346 ret
= ops
->write_std(ctxt
, new_tss_base
,
2347 &tss_seg
.prev_task_link
,
2348 sizeof tss_seg
.prev_task_link
,
2350 if (ret
!= X86EMUL_CONTINUE
)
2351 /* FIXME: need to provide precise fault address */
2355 return load_state_from_tss32(ctxt
, ops
, &tss_seg
);
2358 static int emulator_do_task_switch(struct x86_emulate_ctxt
*ctxt
,
2359 struct x86_emulate_ops
*ops
,
2360 u16 tss_selector
, int reason
,
2361 bool has_error_code
, u32 error_code
)
2363 struct desc_struct curr_tss_desc
, next_tss_desc
;
2365 u16 old_tss_sel
= get_segment_selector(ctxt
, VCPU_SREG_TR
);
2366 ulong old_tss_base
=
2367 ops
->get_cached_segment_base(ctxt
, VCPU_SREG_TR
);
2370 /* FIXME: old_tss_base == ~0 ? */
2372 ret
= read_segment_descriptor(ctxt
, ops
, tss_selector
, &next_tss_desc
);
2373 if (ret
!= X86EMUL_CONTINUE
)
2375 ret
= read_segment_descriptor(ctxt
, ops
, old_tss_sel
, &curr_tss_desc
);
2376 if (ret
!= X86EMUL_CONTINUE
)
2379 /* FIXME: check that next_tss_desc is tss */
2381 if (reason
!= TASK_SWITCH_IRET
) {
2382 if ((tss_selector
& 3) > next_tss_desc
.dpl
||
2383 ops
->cpl(ctxt
) > next_tss_desc
.dpl
)
2384 return emulate_gp(ctxt
, 0);
2387 desc_limit
= desc_limit_scaled(&next_tss_desc
);
2388 if (!next_tss_desc
.p
||
2389 ((desc_limit
< 0x67 && (next_tss_desc
.type
& 8)) ||
2390 desc_limit
< 0x2b)) {
2391 emulate_ts(ctxt
, tss_selector
& 0xfffc);
2392 return X86EMUL_PROPAGATE_FAULT
;
2395 if (reason
== TASK_SWITCH_IRET
|| reason
== TASK_SWITCH_JMP
) {
2396 curr_tss_desc
.type
&= ~(1 << 1); /* clear busy flag */
2397 write_segment_descriptor(ctxt
, ops
, old_tss_sel
,
2401 if (reason
== TASK_SWITCH_IRET
)
2402 ctxt
->eflags
= ctxt
->eflags
& ~X86_EFLAGS_NT
;
2404 /* set back link to prev task only if NT bit is set in eflags
2405 note that old_tss_sel is not used afetr this point */
2406 if (reason
!= TASK_SWITCH_CALL
&& reason
!= TASK_SWITCH_GATE
)
2407 old_tss_sel
= 0xffff;
2409 if (next_tss_desc
.type
& 8)
2410 ret
= task_switch_32(ctxt
, ops
, tss_selector
, old_tss_sel
,
2411 old_tss_base
, &next_tss_desc
);
2413 ret
= task_switch_16(ctxt
, ops
, tss_selector
, old_tss_sel
,
2414 old_tss_base
, &next_tss_desc
);
2415 if (ret
!= X86EMUL_CONTINUE
)
2418 if (reason
== TASK_SWITCH_CALL
|| reason
== TASK_SWITCH_GATE
)
2419 ctxt
->eflags
= ctxt
->eflags
| X86_EFLAGS_NT
;
2421 if (reason
!= TASK_SWITCH_IRET
) {
2422 next_tss_desc
.type
|= (1 << 1); /* set busy flag */
2423 write_segment_descriptor(ctxt
, ops
, tss_selector
,
2427 ops
->set_cr(ctxt
, 0, ops
->get_cr(ctxt
, 0) | X86_CR0_TS
);
2428 ops
->set_segment(ctxt
, tss_selector
, &next_tss_desc
, 0, VCPU_SREG_TR
);
2430 if (has_error_code
) {
2431 struct decode_cache
*c
= &ctxt
->decode
;
2433 c
->op_bytes
= c
->ad_bytes
= (next_tss_desc
.type
& 8) ? 4 : 2;
2435 c
->src
.val
= (unsigned long) error_code
;
2436 ret
= em_push(ctxt
);
2442 int emulator_task_switch(struct x86_emulate_ctxt
*ctxt
,
2443 u16 tss_selector
, int reason
,
2444 bool has_error_code
, u32 error_code
)
2446 struct x86_emulate_ops
*ops
= ctxt
->ops
;
2447 struct decode_cache
*c
= &ctxt
->decode
;
2451 c
->dst
.type
= OP_NONE
;
2453 rc
= emulator_do_task_switch(ctxt
, ops
, tss_selector
, reason
,
2454 has_error_code
, error_code
);
2456 if (rc
== X86EMUL_CONTINUE
)
2459 return (rc
== X86EMUL_UNHANDLEABLE
) ? EMULATION_FAILED
: EMULATION_OK
;
2462 static void string_addr_inc(struct x86_emulate_ctxt
*ctxt
, unsigned seg
,
2463 int reg
, struct operand
*op
)
2465 struct decode_cache
*c
= &ctxt
->decode
;
2466 int df
= (ctxt
->eflags
& EFLG_DF
) ? -1 : 1;
2468 register_address_increment(c
, &c
->regs
[reg
], df
* op
->bytes
);
2469 op
->addr
.mem
.ea
= register_address(c
, c
->regs
[reg
]);
2470 op
->addr
.mem
.seg
= seg
;
2473 static int em_das(struct x86_emulate_ctxt
*ctxt
)
2475 struct decode_cache
*c
= &ctxt
->decode
;
2477 bool af
, cf
, old_cf
;
2479 cf
= ctxt
->eflags
& X86_EFLAGS_CF
;
2485 af
= ctxt
->eflags
& X86_EFLAGS_AF
;
2486 if ((al
& 0x0f) > 9 || af
) {
2488 cf
= old_cf
| (al
>= 250);
2493 if (old_al
> 0x99 || old_cf
) {
2499 /* Set PF, ZF, SF */
2500 c
->src
.type
= OP_IMM
;
2503 emulate_2op_SrcV("or", c
->src
, c
->dst
, ctxt
->eflags
);
2504 ctxt
->eflags
&= ~(X86_EFLAGS_AF
| X86_EFLAGS_CF
);
2506 ctxt
->eflags
|= X86_EFLAGS_CF
;
2508 ctxt
->eflags
|= X86_EFLAGS_AF
;
2509 return X86EMUL_CONTINUE
;
2512 static int em_call_far(struct x86_emulate_ctxt
*ctxt
)
2514 struct decode_cache
*c
= &ctxt
->decode
;
2519 old_cs
= get_segment_selector(ctxt
, VCPU_SREG_CS
);
2522 memcpy(&sel
, c
->src
.valptr
+ c
->op_bytes
, 2);
2523 if (load_segment_descriptor(ctxt
, ctxt
->ops
, sel
, VCPU_SREG_CS
))
2524 return X86EMUL_CONTINUE
;
2527 memcpy(&c
->eip
, c
->src
.valptr
, c
->op_bytes
);
2529 c
->src
.val
= old_cs
;
2531 if (rc
!= X86EMUL_CONTINUE
)
2534 c
->src
.val
= old_eip
;
2535 return em_push(ctxt
);
2538 static int em_ret_near_imm(struct x86_emulate_ctxt
*ctxt
)
2540 struct decode_cache
*c
= &ctxt
->decode
;
2543 c
->dst
.type
= OP_REG
;
2544 c
->dst
.addr
.reg
= &c
->eip
;
2545 c
->dst
.bytes
= c
->op_bytes
;
2546 rc
= emulate_pop(ctxt
, ctxt
->ops
, &c
->dst
.val
, c
->op_bytes
);
2547 if (rc
!= X86EMUL_CONTINUE
)
2549 register_address_increment(c
, &c
->regs
[VCPU_REGS_RSP
], c
->src
.val
);
2550 return X86EMUL_CONTINUE
;
2553 static int em_add(struct x86_emulate_ctxt
*ctxt
)
2555 struct decode_cache
*c
= &ctxt
->decode
;
2557 emulate_2op_SrcV("add", c
->src
, c
->dst
, ctxt
->eflags
);
2558 return X86EMUL_CONTINUE
;
2561 static int em_or(struct x86_emulate_ctxt
*ctxt
)
2563 struct decode_cache
*c
= &ctxt
->decode
;
2565 emulate_2op_SrcV("or", c
->src
, c
->dst
, ctxt
->eflags
);
2566 return X86EMUL_CONTINUE
;
2569 static int em_adc(struct x86_emulate_ctxt
*ctxt
)
2571 struct decode_cache
*c
= &ctxt
->decode
;
2573 emulate_2op_SrcV("adc", c
->src
, c
->dst
, ctxt
->eflags
);
2574 return X86EMUL_CONTINUE
;
2577 static int em_sbb(struct x86_emulate_ctxt
*ctxt
)
2579 struct decode_cache
*c
= &ctxt
->decode
;
2581 emulate_2op_SrcV("sbb", c
->src
, c
->dst
, ctxt
->eflags
);
2582 return X86EMUL_CONTINUE
;
2585 static int em_and(struct x86_emulate_ctxt
*ctxt
)
2587 struct decode_cache
*c
= &ctxt
->decode
;
2589 emulate_2op_SrcV("and", c
->src
, c
->dst
, ctxt
->eflags
);
2590 return X86EMUL_CONTINUE
;
2593 static int em_sub(struct x86_emulate_ctxt
*ctxt
)
2595 struct decode_cache
*c
= &ctxt
->decode
;
2597 emulate_2op_SrcV("sub", c
->src
, c
->dst
, ctxt
->eflags
);
2598 return X86EMUL_CONTINUE
;
2601 static int em_xor(struct x86_emulate_ctxt
*ctxt
)
2603 struct decode_cache
*c
= &ctxt
->decode
;
2605 emulate_2op_SrcV("xor", c
->src
, c
->dst
, ctxt
->eflags
);
2606 return X86EMUL_CONTINUE
;
2609 static int em_cmp(struct x86_emulate_ctxt
*ctxt
)
2611 struct decode_cache
*c
= &ctxt
->decode
;
2613 emulate_2op_SrcV("cmp", c
->src
, c
->dst
, ctxt
->eflags
);
2614 /* Disable writeback. */
2615 c
->dst
.type
= OP_NONE
;
2616 return X86EMUL_CONTINUE
;
2619 static int em_imul(struct x86_emulate_ctxt
*ctxt
)
2621 struct decode_cache
*c
= &ctxt
->decode
;
2623 emulate_2op_SrcV_nobyte("imul", c
->src
, c
->dst
, ctxt
->eflags
);
2624 return X86EMUL_CONTINUE
;
2627 static int em_imul_3op(struct x86_emulate_ctxt
*ctxt
)
2629 struct decode_cache
*c
= &ctxt
->decode
;
2631 c
->dst
.val
= c
->src2
.val
;
2632 return em_imul(ctxt
);
2635 static int em_cwd(struct x86_emulate_ctxt
*ctxt
)
2637 struct decode_cache
*c
= &ctxt
->decode
;
2639 c
->dst
.type
= OP_REG
;
2640 c
->dst
.bytes
= c
->src
.bytes
;
2641 c
->dst
.addr
.reg
= &c
->regs
[VCPU_REGS_RDX
];
2642 c
->dst
.val
= ~((c
->src
.val
>> (c
->src
.bytes
* 8 - 1)) - 1);
2644 return X86EMUL_CONTINUE
;
2647 static int em_rdtsc(struct x86_emulate_ctxt
*ctxt
)
2649 struct decode_cache
*c
= &ctxt
->decode
;
2652 ctxt
->ops
->get_msr(ctxt
, MSR_IA32_TSC
, &tsc
);
2653 c
->regs
[VCPU_REGS_RAX
] = (u32
)tsc
;
2654 c
->regs
[VCPU_REGS_RDX
] = tsc
>> 32;
2655 return X86EMUL_CONTINUE
;
2658 static int em_mov(struct x86_emulate_ctxt
*ctxt
)
2660 struct decode_cache
*c
= &ctxt
->decode
;
2661 c
->dst
.val
= c
->src
.val
;
2662 return X86EMUL_CONTINUE
;
2665 static int em_movdqu(struct x86_emulate_ctxt
*ctxt
)
2667 struct decode_cache
*c
= &ctxt
->decode
;
2668 memcpy(&c
->dst
.vec_val
, &c
->src
.vec_val
, c
->op_bytes
);
2669 return X86EMUL_CONTINUE
;
2672 static int em_invlpg(struct x86_emulate_ctxt
*ctxt
)
2674 struct decode_cache
*c
= &ctxt
->decode
;
2678 rc
= linearize(ctxt
, c
->src
.addr
.mem
, 1, false, &linear
);
2679 if (rc
== X86EMUL_CONTINUE
)
2680 ctxt
->ops
->invlpg(ctxt
, linear
);
2681 /* Disable writeback. */
2682 c
->dst
.type
= OP_NONE
;
2683 return X86EMUL_CONTINUE
;
2686 static int em_clts(struct x86_emulate_ctxt
*ctxt
)
2690 cr0
= ctxt
->ops
->get_cr(ctxt
, 0);
2692 ctxt
->ops
->set_cr(ctxt
, 0, cr0
);
2693 return X86EMUL_CONTINUE
;
2696 static int em_vmcall(struct x86_emulate_ctxt
*ctxt
)
2698 struct decode_cache
*c
= &ctxt
->decode
;
2701 if (c
->modrm_mod
!= 3 || c
->modrm_rm
!= 1)
2702 return X86EMUL_UNHANDLEABLE
;
2704 rc
= ctxt
->ops
->fix_hypercall(ctxt
);
2705 if (rc
!= X86EMUL_CONTINUE
)
2708 /* Let the processor re-execute the fixed hypercall */
2710 /* Disable writeback. */
2711 c
->dst
.type
= OP_NONE
;
2712 return X86EMUL_CONTINUE
;
2715 static int em_lgdt(struct x86_emulate_ctxt
*ctxt
)
2717 struct decode_cache
*c
= &ctxt
->decode
;
2718 struct desc_ptr desc_ptr
;
2721 rc
= read_descriptor(ctxt
, c
->src
.addr
.mem
,
2722 &desc_ptr
.size
, &desc_ptr
.address
,
2724 if (rc
!= X86EMUL_CONTINUE
)
2726 ctxt
->ops
->set_gdt(ctxt
, &desc_ptr
);
2727 /* Disable writeback. */
2728 c
->dst
.type
= OP_NONE
;
2729 return X86EMUL_CONTINUE
;
2732 static int em_vmmcall(struct x86_emulate_ctxt
*ctxt
)
2734 struct decode_cache
*c
= &ctxt
->decode
;
2737 rc
= ctxt
->ops
->fix_hypercall(ctxt
);
2739 /* Disable writeback. */
2740 c
->dst
.type
= OP_NONE
;
2744 static int em_lidt(struct x86_emulate_ctxt
*ctxt
)
2746 struct decode_cache
*c
= &ctxt
->decode
;
2747 struct desc_ptr desc_ptr
;
2750 rc
= read_descriptor(ctxt
, c
->src
.addr
.mem
,
2751 &desc_ptr
.size
, &desc_ptr
.address
,
2753 if (rc
!= X86EMUL_CONTINUE
)
2755 ctxt
->ops
->set_idt(ctxt
, &desc_ptr
);
2756 /* Disable writeback. */
2757 c
->dst
.type
= OP_NONE
;
2758 return X86EMUL_CONTINUE
;
2761 static int em_smsw(struct x86_emulate_ctxt
*ctxt
)
2763 struct decode_cache
*c
= &ctxt
->decode
;
2766 c
->dst
.val
= ctxt
->ops
->get_cr(ctxt
, 0);
2767 return X86EMUL_CONTINUE
;
2770 static int em_lmsw(struct x86_emulate_ctxt
*ctxt
)
2772 struct decode_cache
*c
= &ctxt
->decode
;
2773 ctxt
->ops
->set_cr(ctxt
, 0, (ctxt
->ops
->get_cr(ctxt
, 0) & ~0x0eul
)
2774 | (c
->src
.val
& 0x0f));
2775 c
->dst
.type
= OP_NONE
;
2776 return X86EMUL_CONTINUE
;
2779 static bool valid_cr(int nr
)
2791 static int check_cr_read(struct x86_emulate_ctxt
*ctxt
)
2793 struct decode_cache
*c
= &ctxt
->decode
;
2795 if (!valid_cr(c
->modrm_reg
))
2796 return emulate_ud(ctxt
);
2798 return X86EMUL_CONTINUE
;
2801 static int check_cr_write(struct x86_emulate_ctxt
*ctxt
)
2803 struct decode_cache
*c
= &ctxt
->decode
;
2804 u64 new_val
= c
->src
.val64
;
2805 int cr
= c
->modrm_reg
;
2808 static u64 cr_reserved_bits
[] = {
2809 0xffffffff00000000ULL
,
2810 0, 0, 0, /* CR3 checked later */
2817 return emulate_ud(ctxt
);
2819 if (new_val
& cr_reserved_bits
[cr
])
2820 return emulate_gp(ctxt
, 0);
2825 if (((new_val
& X86_CR0_PG
) && !(new_val
& X86_CR0_PE
)) ||
2826 ((new_val
& X86_CR0_NW
) && !(new_val
& X86_CR0_CD
)))
2827 return emulate_gp(ctxt
, 0);
2829 cr4
= ctxt
->ops
->get_cr(ctxt
, 4);
2830 ctxt
->ops
->get_msr(ctxt
, MSR_EFER
, &efer
);
2832 if ((new_val
& X86_CR0_PG
) && (efer
& EFER_LME
) &&
2833 !(cr4
& X86_CR4_PAE
))
2834 return emulate_gp(ctxt
, 0);
2841 ctxt
->ops
->get_msr(ctxt
, MSR_EFER
, &efer
);
2842 if (efer
& EFER_LMA
)
2843 rsvd
= CR3_L_MODE_RESERVED_BITS
;
2844 else if (ctxt
->ops
->get_cr(ctxt
, 4) & X86_CR4_PAE
)
2845 rsvd
= CR3_PAE_RESERVED_BITS
;
2846 else if (ctxt
->ops
->get_cr(ctxt
, 0) & X86_CR0_PG
)
2847 rsvd
= CR3_NONPAE_RESERVED_BITS
;
2850 return emulate_gp(ctxt
, 0);
2857 cr4
= ctxt
->ops
->get_cr(ctxt
, 4);
2858 ctxt
->ops
->get_msr(ctxt
, MSR_EFER
, &efer
);
2860 if ((efer
& EFER_LMA
) && !(new_val
& X86_CR4_PAE
))
2861 return emulate_gp(ctxt
, 0);
2867 return X86EMUL_CONTINUE
;
2870 static int check_dr7_gd(struct x86_emulate_ctxt
*ctxt
)
2874 ctxt
->ops
->get_dr(ctxt
, 7, &dr7
);
2876 /* Check if DR7.Global_Enable is set */
2877 return dr7
& (1 << 13);
2880 static int check_dr_read(struct x86_emulate_ctxt
*ctxt
)
2882 struct decode_cache
*c
= &ctxt
->decode
;
2883 int dr
= c
->modrm_reg
;
2887 return emulate_ud(ctxt
);
2889 cr4
= ctxt
->ops
->get_cr(ctxt
, 4);
2890 if ((cr4
& X86_CR4_DE
) && (dr
== 4 || dr
== 5))
2891 return emulate_ud(ctxt
);
2893 if (check_dr7_gd(ctxt
))
2894 return emulate_db(ctxt
);
2896 return X86EMUL_CONTINUE
;
2899 static int check_dr_write(struct x86_emulate_ctxt
*ctxt
)
2901 struct decode_cache
*c
= &ctxt
->decode
;
2902 u64 new_val
= c
->src
.val64
;
2903 int dr
= c
->modrm_reg
;
2905 if ((dr
== 6 || dr
== 7) && (new_val
& 0xffffffff00000000ULL
))
2906 return emulate_gp(ctxt
, 0);
2908 return check_dr_read(ctxt
);
2911 static int check_svme(struct x86_emulate_ctxt
*ctxt
)
2915 ctxt
->ops
->get_msr(ctxt
, MSR_EFER
, &efer
);
2917 if (!(efer
& EFER_SVME
))
2918 return emulate_ud(ctxt
);
2920 return X86EMUL_CONTINUE
;
2923 static int check_svme_pa(struct x86_emulate_ctxt
*ctxt
)
2925 u64 rax
= ctxt
->decode
.regs
[VCPU_REGS_RAX
];
2927 /* Valid physical address? */
2928 if (rax
& 0xffff000000000000ULL
)
2929 return emulate_gp(ctxt
, 0);
2931 return check_svme(ctxt
);
2934 static int check_rdtsc(struct x86_emulate_ctxt
*ctxt
)
2936 u64 cr4
= ctxt
->ops
->get_cr(ctxt
, 4);
2938 if (cr4
& X86_CR4_TSD
&& ctxt
->ops
->cpl(ctxt
))
2939 return emulate_ud(ctxt
);
2941 return X86EMUL_CONTINUE
;
2944 static int check_rdpmc(struct x86_emulate_ctxt
*ctxt
)
2946 u64 cr4
= ctxt
->ops
->get_cr(ctxt
, 4);
2947 u64 rcx
= ctxt
->decode
.regs
[VCPU_REGS_RCX
];
2949 if ((!(cr4
& X86_CR4_PCE
) && ctxt
->ops
->cpl(ctxt
)) ||
2951 return emulate_gp(ctxt
, 0);
2953 return X86EMUL_CONTINUE
;
2956 static int check_perm_in(struct x86_emulate_ctxt
*ctxt
)
2958 struct decode_cache
*c
= &ctxt
->decode
;
2960 c
->dst
.bytes
= min(c
->dst
.bytes
, 4u);
2961 if (!emulator_io_permited(ctxt
, ctxt
->ops
, c
->src
.val
, c
->dst
.bytes
))
2962 return emulate_gp(ctxt
, 0);
2964 return X86EMUL_CONTINUE
;
2967 static int check_perm_out(struct x86_emulate_ctxt
*ctxt
)
2969 struct decode_cache
*c
= &ctxt
->decode
;
2971 c
->src
.bytes
= min(c
->src
.bytes
, 4u);
2972 if (!emulator_io_permited(ctxt
, ctxt
->ops
, c
->dst
.val
, c
->src
.bytes
))
2973 return emulate_gp(ctxt
, 0);
2975 return X86EMUL_CONTINUE
;
2978 #define D(_y) { .flags = (_y) }
2979 #define DI(_y, _i) { .flags = (_y), .intercept = x86_intercept_##_i }
2980 #define DIP(_y, _i, _p) { .flags = (_y), .intercept = x86_intercept_##_i, \
2981 .check_perm = (_p) }
2983 #define EXT(_f, _e) { .flags = ((_f) | RMExt), .u.group = (_e) }
2984 #define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
2985 #define GD(_f, _g) { .flags = ((_f) | GroupDual), .u.gdual = (_g) }
2986 #define I(_f, _e) { .flags = (_f), .u.execute = (_e) }
2987 #define II(_f, _e, _i) \
2988 { .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i }
2989 #define IIP(_f, _e, _i, _p) \
2990 { .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i, \
2991 .check_perm = (_p) }
2992 #define GP(_f, _g) { .flags = ((_f) | Prefix), .u.gprefix = (_g) }
2994 #define D2bv(_f) D((_f) | ByteOp), D(_f)
2995 #define D2bvIP(_f, _i, _p) DIP((_f) | ByteOp, _i, _p), DIP(_f, _i, _p)
2996 #define I2bv(_f, _e) I((_f) | ByteOp, _e), I(_f, _e)
2998 #define I6ALU(_f, _e) I2bv((_f) | DstMem | SrcReg | ModRM, _e), \
2999 I2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock, _e), \
3000 I2bv(((_f) & ~Lock) | DstAcc | SrcImm, _e)
3002 static struct opcode group7_rm1
[] = {
3003 DI(SrcNone
| ModRM
| Priv
, monitor
),
3004 DI(SrcNone
| ModRM
| Priv
, mwait
),
3008 static struct opcode group7_rm3
[] = {
3009 DIP(SrcNone
| ModRM
| Prot
| Priv
, vmrun
, check_svme_pa
),
3010 II(SrcNone
| ModRM
| Prot
| VendorSpecific
, em_vmmcall
, vmmcall
),
3011 DIP(SrcNone
| ModRM
| Prot
| Priv
, vmload
, check_svme_pa
),
3012 DIP(SrcNone
| ModRM
| Prot
| Priv
, vmsave
, check_svme_pa
),
3013 DIP(SrcNone
| ModRM
| Prot
| Priv
, stgi
, check_svme
),
3014 DIP(SrcNone
| ModRM
| Prot
| Priv
, clgi
, check_svme
),
3015 DIP(SrcNone
| ModRM
| Prot
| Priv
, skinit
, check_svme
),
3016 DIP(SrcNone
| ModRM
| Prot
| Priv
, invlpga
, check_svme
),
3019 static struct opcode group7_rm7
[] = {
3021 DIP(SrcNone
| ModRM
, rdtscp
, check_rdtsc
),
3025 static struct opcode group1
[] = {
3036 static struct opcode group1A
[] = {
3037 D(DstMem
| SrcNone
| ModRM
| Mov
| Stack
), N
, N
, N
, N
, N
, N
, N
,
3040 static struct opcode group3
[] = {
3041 D(DstMem
| SrcImm
| ModRM
), D(DstMem
| SrcImm
| ModRM
),
3042 D(DstMem
| SrcNone
| ModRM
| Lock
), D(DstMem
| SrcNone
| ModRM
| Lock
),
3043 X4(D(SrcMem
| ModRM
)),
3046 static struct opcode group4
[] = {
3047 D(ByteOp
| DstMem
| SrcNone
| ModRM
| Lock
), D(ByteOp
| DstMem
| SrcNone
| ModRM
| Lock
),
3051 static struct opcode group5
[] = {
3052 D(DstMem
| SrcNone
| ModRM
| Lock
), D(DstMem
| SrcNone
| ModRM
| Lock
),
3053 D(SrcMem
| ModRM
| Stack
),
3054 I(SrcMemFAddr
| ModRM
| ImplicitOps
| Stack
, em_call_far
),
3055 D(SrcMem
| ModRM
| Stack
), D(SrcMemFAddr
| ModRM
| ImplicitOps
),
3056 D(SrcMem
| ModRM
| Stack
), N
,
3059 static struct opcode group6
[] = {
3060 DI(ModRM
| Prot
, sldt
),
3061 DI(ModRM
| Prot
, str
),
3062 DI(ModRM
| Prot
| Priv
, lldt
),
3063 DI(ModRM
| Prot
| Priv
, ltr
),
3067 static struct group_dual group7
= { {
3068 DI(ModRM
| Mov
| DstMem
| Priv
, sgdt
),
3069 DI(ModRM
| Mov
| DstMem
| Priv
, sidt
),
3070 II(ModRM
| SrcMem
| Priv
, em_lgdt
, lgdt
),
3071 II(ModRM
| SrcMem
| Priv
, em_lidt
, lidt
),
3072 II(SrcNone
| ModRM
| DstMem
| Mov
, em_smsw
, smsw
), N
,
3073 II(SrcMem16
| ModRM
| Mov
| Priv
, em_lmsw
, lmsw
),
3074 II(SrcMem
| ModRM
| ByteOp
| Priv
| NoAccess
, em_invlpg
, invlpg
),
3076 I(SrcNone
| ModRM
| Priv
| VendorSpecific
, em_vmcall
),
3078 N
, EXT(0, group7_rm3
),
3079 II(SrcNone
| ModRM
| DstMem
| Mov
, em_smsw
, smsw
), N
,
3080 II(SrcMem16
| ModRM
| Mov
| Priv
, em_lmsw
, lmsw
), EXT(0, group7_rm7
),
3083 static struct opcode group8
[] = {
3085 D(DstMem
| SrcImmByte
| ModRM
), D(DstMem
| SrcImmByte
| ModRM
| Lock
),
3086 D(DstMem
| SrcImmByte
| ModRM
| Lock
), D(DstMem
| SrcImmByte
| ModRM
| Lock
),
3089 static struct group_dual group9
= { {
3090 N
, D(DstMem64
| ModRM
| Lock
), N
, N
, N
, N
, N
, N
,
3092 N
, N
, N
, N
, N
, N
, N
, N
,
3095 static struct opcode group11
[] = {
3096 I(DstMem
| SrcImm
| ModRM
| Mov
, em_mov
), X7(D(Undefined
)),
3099 static struct gprefix pfx_0f_6f_0f_7f
= {
3100 N
, N
, N
, I(Sse
, em_movdqu
),
3103 static struct opcode opcode_table
[256] = {
3105 I6ALU(Lock
, em_add
),
3106 D(ImplicitOps
| Stack
| No64
), D(ImplicitOps
| Stack
| No64
),
3109 D(ImplicitOps
| Stack
| No64
), N
,
3111 I6ALU(Lock
, em_adc
),
3112 D(ImplicitOps
| Stack
| No64
), D(ImplicitOps
| Stack
| No64
),
3114 I6ALU(Lock
, em_sbb
),
3115 D(ImplicitOps
| Stack
| No64
), D(ImplicitOps
| Stack
| No64
),
3117 I6ALU(Lock
, em_and
), N
, N
,
3119 I6ALU(Lock
, em_sub
), N
, I(ByteOp
| DstAcc
| No64
, em_das
),
3121 I6ALU(Lock
, em_xor
), N
, N
,
3123 I6ALU(0, em_cmp
), N
, N
,
3127 X8(I(SrcReg
| Stack
, em_push
)),
3129 X8(I(DstReg
| Stack
, em_pop
)),
3131 I(ImplicitOps
| Stack
| No64
, em_pusha
),
3132 I(ImplicitOps
| Stack
| No64
, em_popa
),
3133 N
, D(DstReg
| SrcMem32
| ModRM
| Mov
) /* movsxd (x86/64) */ ,
3136 I(SrcImm
| Mov
| Stack
, em_push
),
3137 I(DstReg
| SrcMem
| ModRM
| Src2Imm
, em_imul_3op
),
3138 I(SrcImmByte
| Mov
| Stack
, em_push
),
3139 I(DstReg
| SrcMem
| ModRM
| Src2ImmByte
, em_imul_3op
),
3140 D2bvIP(DstDI
| Mov
| String
, ins
, check_perm_in
), /* insb, insw/insd */
3141 D2bvIP(SrcSI
| ImplicitOps
| String
, outs
, check_perm_out
), /* outsb, outsw/outsd */
3145 G(ByteOp
| DstMem
| SrcImm
| ModRM
| Group
, group1
),
3146 G(DstMem
| SrcImm
| ModRM
| Group
, group1
),
3147 G(ByteOp
| DstMem
| SrcImm
| ModRM
| No64
| Group
, group1
),
3148 G(DstMem
| SrcImmByte
| ModRM
| Group
, group1
),
3149 D2bv(DstMem
| SrcReg
| ModRM
), D2bv(DstMem
| SrcReg
| ModRM
| Lock
),
3151 I2bv(DstMem
| SrcReg
| ModRM
| Mov
, em_mov
),
3152 I2bv(DstReg
| SrcMem
| ModRM
| Mov
, em_mov
),
3153 D(DstMem
| SrcNone
| ModRM
| Mov
), D(ModRM
| SrcMem
| NoAccess
| DstReg
),
3154 D(ImplicitOps
| SrcMem16
| ModRM
), G(0, group1A
),
3156 DI(SrcAcc
| DstReg
, pause
), X7(D(SrcAcc
| DstReg
)),
3158 D(DstAcc
| SrcNone
), I(ImplicitOps
| SrcAcc
, em_cwd
),
3159 I(SrcImmFAddr
| No64
, em_call_far
), N
,
3160 II(ImplicitOps
| Stack
, em_pushf
, pushf
),
3161 II(ImplicitOps
| Stack
, em_popf
, popf
), N
, N
,
3163 I2bv(DstAcc
| SrcMem
| Mov
| MemAbs
, em_mov
),
3164 I2bv(DstMem
| SrcAcc
| Mov
| MemAbs
, em_mov
),
3165 I2bv(SrcSI
| DstDI
| Mov
| String
, em_mov
),
3166 I2bv(SrcSI
| DstDI
| String
, em_cmp
),
3168 D2bv(DstAcc
| SrcImm
),
3169 I2bv(SrcAcc
| DstDI
| Mov
| String
, em_mov
),
3170 I2bv(SrcSI
| DstAcc
| Mov
| String
, em_mov
),
3171 I2bv(SrcAcc
| DstDI
| String
, em_cmp
),
3173 X8(I(ByteOp
| DstReg
| SrcImm
| Mov
, em_mov
)),
3175 X8(I(DstReg
| SrcImm
| Mov
, em_mov
)),
3177 D2bv(DstMem
| SrcImmByte
| ModRM
),
3178 I(ImplicitOps
| Stack
| SrcImmU16
, em_ret_near_imm
),
3179 D(ImplicitOps
| Stack
),
3180 D(DstReg
| SrcMemFAddr
| ModRM
| No64
), D(DstReg
| SrcMemFAddr
| ModRM
| No64
),
3181 G(ByteOp
, group11
), G(0, group11
),
3183 N
, N
, N
, D(ImplicitOps
| Stack
),
3184 D(ImplicitOps
), DI(SrcImmByte
, intn
),
3185 D(ImplicitOps
| No64
), DI(ImplicitOps
, iret
),
3187 D2bv(DstMem
| SrcOne
| ModRM
), D2bv(DstMem
| ModRM
),
3190 N
, N
, N
, N
, N
, N
, N
, N
,
3193 D2bvIP(SrcImmUByte
| DstAcc
, in
, check_perm_in
),
3194 D2bvIP(SrcAcc
| DstImmUByte
, out
, check_perm_out
),
3196 D(SrcImm
| Stack
), D(SrcImm
| ImplicitOps
),
3197 D(SrcImmFAddr
| No64
), D(SrcImmByte
| ImplicitOps
),
3198 D2bvIP(SrcNone
| DstAcc
, in
, check_perm_in
),
3199 D2bvIP(SrcAcc
| ImplicitOps
, out
, check_perm_out
),
3201 N
, DI(ImplicitOps
, icebp
), N
, N
,
3202 DI(ImplicitOps
| Priv
, hlt
), D(ImplicitOps
),
3203 G(ByteOp
, group3
), G(0, group3
),
3205 D(ImplicitOps
), D(ImplicitOps
), D(ImplicitOps
), D(ImplicitOps
),
3206 D(ImplicitOps
), D(ImplicitOps
), G(0, group4
), G(0, group5
),
3209 static struct opcode twobyte_table
[256] = {
3211 G(0, group6
), GD(0, &group7
), N
, N
,
3212 N
, D(ImplicitOps
| VendorSpecific
), DI(ImplicitOps
| Priv
, clts
), N
,
3213 DI(ImplicitOps
| Priv
, invd
), DI(ImplicitOps
| Priv
, wbinvd
), N
, N
,
3214 N
, D(ImplicitOps
| ModRM
), N
, N
,
3216 N
, N
, N
, N
, N
, N
, N
, N
, D(ImplicitOps
| ModRM
), N
, N
, N
, N
, N
, N
, N
,
3218 DIP(ModRM
| DstMem
| Priv
| Op3264
, cr_read
, check_cr_read
),
3219 DIP(ModRM
| DstMem
| Priv
| Op3264
, dr_read
, check_dr_read
),
3220 DIP(ModRM
| SrcMem
| Priv
| Op3264
, cr_write
, check_cr_write
),
3221 DIP(ModRM
| SrcMem
| Priv
| Op3264
, dr_write
, check_dr_write
),
3223 N
, N
, N
, N
, N
, N
, N
, N
,
3225 DI(ImplicitOps
| Priv
, wrmsr
),
3226 IIP(ImplicitOps
, em_rdtsc
, rdtsc
, check_rdtsc
),
3227 DI(ImplicitOps
| Priv
, rdmsr
),
3228 DIP(ImplicitOps
| Priv
, rdpmc
, check_rdpmc
),
3229 D(ImplicitOps
| VendorSpecific
), D(ImplicitOps
| Priv
| VendorSpecific
),
3231 N
, N
, N
, N
, N
, N
, N
, N
,
3233 X16(D(DstReg
| SrcMem
| ModRM
| Mov
)),
3235 N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
,
3240 N
, N
, N
, GP(SrcMem
| DstReg
| ModRM
| Mov
, &pfx_0f_6f_0f_7f
),
3245 N
, N
, N
, GP(SrcReg
| DstMem
| ModRM
| Mov
, &pfx_0f_6f_0f_7f
),
3249 X16(D(ByteOp
| DstMem
| SrcNone
| ModRM
| Mov
)),
3251 D(ImplicitOps
| Stack
), D(ImplicitOps
| Stack
),
3252 DI(ImplicitOps
, cpuid
), D(DstMem
| SrcReg
| ModRM
| BitOp
),
3253 D(DstMem
| SrcReg
| Src2ImmByte
| ModRM
),
3254 D(DstMem
| SrcReg
| Src2CL
| ModRM
), N
, N
,
3256 D(ImplicitOps
| Stack
), D(ImplicitOps
| Stack
),
3257 DI(ImplicitOps
, rsm
), D(DstMem
| SrcReg
| ModRM
| BitOp
| Lock
),
3258 D(DstMem
| SrcReg
| Src2ImmByte
| ModRM
),
3259 D(DstMem
| SrcReg
| Src2CL
| ModRM
),
3260 D(ModRM
), I(DstReg
| SrcMem
| ModRM
, em_imul
),
3262 D2bv(DstMem
| SrcReg
| ModRM
| Lock
),
3263 D(DstReg
| SrcMemFAddr
| ModRM
), D(DstMem
| SrcReg
| ModRM
| BitOp
| Lock
),
3264 D(DstReg
| SrcMemFAddr
| ModRM
), D(DstReg
| SrcMemFAddr
| ModRM
),
3265 D(ByteOp
| DstReg
| SrcMem
| ModRM
| Mov
), D(DstReg
| SrcMem16
| ModRM
| Mov
),
3268 G(BitOp
, group8
), D(DstMem
| SrcReg
| ModRM
| BitOp
| Lock
),
3269 D(DstReg
| SrcMem
| ModRM
), D(DstReg
| SrcMem
| ModRM
),
3270 D(ByteOp
| DstReg
| SrcMem
| ModRM
| Mov
), D(DstReg
| SrcMem16
| ModRM
| Mov
),
3272 D2bv(DstMem
| SrcReg
| ModRM
| Lock
),
3273 N
, D(DstMem
| SrcReg
| ModRM
| Mov
),
3274 N
, N
, N
, GD(0, &group9
),
3275 N
, N
, N
, N
, N
, N
, N
, N
,
3277 N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
,
3279 N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
,
3281 N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
, N
3297 static unsigned imm_size(struct decode_cache
*c
)
3301 size
= (c
->d
& ByteOp
) ? 1 : c
->op_bytes
;
3307 static int decode_imm(struct x86_emulate_ctxt
*ctxt
, struct operand
*op
,
3308 unsigned size
, bool sign_extension
)
3310 struct decode_cache
*c
= &ctxt
->decode
;
3311 struct x86_emulate_ops
*ops
= ctxt
->ops
;
3312 int rc
= X86EMUL_CONTINUE
;
3316 op
->addr
.mem
.ea
= c
->eip
;
3317 /* NB. Immediates are sign-extended as necessary. */
3318 switch (op
->bytes
) {
3320 op
->val
= insn_fetch(s8
, 1, c
->eip
);
3323 op
->val
= insn_fetch(s16
, 2, c
->eip
);
3326 op
->val
= insn_fetch(s32
, 4, c
->eip
);
3329 if (!sign_extension
) {
3330 switch (op
->bytes
) {
3338 op
->val
&= 0xffffffff;
3347 x86_decode_insn(struct x86_emulate_ctxt
*ctxt
, void *insn
, int insn_len
)
3349 struct x86_emulate_ops
*ops
= ctxt
->ops
;
3350 struct decode_cache
*c
= &ctxt
->decode
;
3351 int rc
= X86EMUL_CONTINUE
;
3352 int mode
= ctxt
->mode
;
3353 int def_op_bytes
, def_ad_bytes
, goffset
, simd_prefix
;
3354 bool op_prefix
= false;
3355 struct opcode opcode
;
3356 struct operand memop
= { .type
= OP_NONE
};
3359 c
->fetch
.start
= c
->eip
;
3360 c
->fetch
.end
= c
->fetch
.start
+ insn_len
;
3362 memcpy(c
->fetch
.data
, insn
, insn_len
);
3365 case X86EMUL_MODE_REAL
:
3366 case X86EMUL_MODE_VM86
:
3367 case X86EMUL_MODE_PROT16
:
3368 def_op_bytes
= def_ad_bytes
= 2;
3370 case X86EMUL_MODE_PROT32
:
3371 def_op_bytes
= def_ad_bytes
= 4;
3373 #ifdef CONFIG_X86_64
3374 case X86EMUL_MODE_PROT64
:
3383 c
->op_bytes
= def_op_bytes
;
3384 c
->ad_bytes
= def_ad_bytes
;
3386 /* Legacy prefixes. */
3388 switch (c
->b
= insn_fetch(u8
, 1, c
->eip
)) {
3389 case 0x66: /* operand-size override */
3391 /* switch between 2/4 bytes */
3392 c
->op_bytes
= def_op_bytes
^ 6;
3394 case 0x67: /* address-size override */
3395 if (mode
== X86EMUL_MODE_PROT64
)
3396 /* switch between 4/8 bytes */
3397 c
->ad_bytes
= def_ad_bytes
^ 12;
3399 /* switch between 2/4 bytes */
3400 c
->ad_bytes
= def_ad_bytes
^ 6;
3402 case 0x26: /* ES override */
3403 case 0x2e: /* CS override */
3404 case 0x36: /* SS override */
3405 case 0x3e: /* DS override */
3406 set_seg_override(c
, (c
->b
>> 3) & 3);
3408 case 0x64: /* FS override */
3409 case 0x65: /* GS override */
3410 set_seg_override(c
, c
->b
& 7);
3412 case 0x40 ... 0x4f: /* REX */
3413 if (mode
!= X86EMUL_MODE_PROT64
)
3415 c
->rex_prefix
= c
->b
;
3417 case 0xf0: /* LOCK */
3420 case 0xf2: /* REPNE/REPNZ */
3421 case 0xf3: /* REP/REPE/REPZ */
3422 c
->rep_prefix
= c
->b
;
3428 /* Any legacy prefix after a REX prefix nullifies its effect. */
3436 if (c
->rex_prefix
& 8)
3437 c
->op_bytes
= 8; /* REX.W */
3439 /* Opcode byte(s). */
3440 opcode
= opcode_table
[c
->b
];
3441 /* Two-byte opcode? */
3444 c
->b
= insn_fetch(u8
, 1, c
->eip
);
3445 opcode
= twobyte_table
[c
->b
];
3447 c
->d
= opcode
.flags
;
3449 while (c
->d
& GroupMask
) {
3450 switch (c
->d
& GroupMask
) {
3452 c
->modrm
= insn_fetch(u8
, 1, c
->eip
);
3454 goffset
= (c
->modrm
>> 3) & 7;
3455 opcode
= opcode
.u
.group
[goffset
];
3458 c
->modrm
= insn_fetch(u8
, 1, c
->eip
);
3460 goffset
= (c
->modrm
>> 3) & 7;
3461 if ((c
->modrm
>> 6) == 3)
3462 opcode
= opcode
.u
.gdual
->mod3
[goffset
];
3464 opcode
= opcode
.u
.gdual
->mod012
[goffset
];
3467 goffset
= c
->modrm
& 7;
3468 opcode
= opcode
.u
.group
[goffset
];
3471 if (c
->rep_prefix
&& op_prefix
)
3472 return X86EMUL_UNHANDLEABLE
;
3473 simd_prefix
= op_prefix
? 0x66 : c
->rep_prefix
;
3474 switch (simd_prefix
) {
3475 case 0x00: opcode
= opcode
.u
.gprefix
->pfx_no
; break;
3476 case 0x66: opcode
= opcode
.u
.gprefix
->pfx_66
; break;
3477 case 0xf2: opcode
= opcode
.u
.gprefix
->pfx_f2
; break;
3478 case 0xf3: opcode
= opcode
.u
.gprefix
->pfx_f3
; break;
3482 return X86EMUL_UNHANDLEABLE
;
3486 c
->d
|= opcode
.flags
;
3489 c
->execute
= opcode
.u
.execute
;
3490 c
->check_perm
= opcode
.check_perm
;
3491 c
->intercept
= opcode
.intercept
;
3494 if (c
->d
== 0 || (c
->d
& Undefined
))
3497 if (!(c
->d
& VendorSpecific
) && ctxt
->only_vendor_specific_insn
)
3500 if (mode
== X86EMUL_MODE_PROT64
&& (c
->d
& Stack
))
3503 if (c
->d
& Op3264
) {
3504 if (mode
== X86EMUL_MODE_PROT64
)
3513 /* ModRM and SIB bytes. */
3515 rc
= decode_modrm(ctxt
, ops
, &memop
);
3516 if (!c
->has_seg_override
)
3517 set_seg_override(c
, c
->modrm_seg
);
3518 } else if (c
->d
& MemAbs
)
3519 rc
= decode_abs(ctxt
, ops
, &memop
);
3520 if (rc
!= X86EMUL_CONTINUE
)
3523 if (!c
->has_seg_override
)
3524 set_seg_override(c
, VCPU_SREG_DS
);
3526 memop
.addr
.mem
.seg
= seg_override(ctxt
, c
);
3528 if (memop
.type
== OP_MEM
&& c
->ad_bytes
!= 8)
3529 memop
.addr
.mem
.ea
= (u32
)memop
.addr
.mem
.ea
;
3531 if (memop
.type
== OP_MEM
&& c
->rip_relative
)
3532 memop
.addr
.mem
.ea
+= c
->eip
;
3535 * Decode and fetch the source operand: register, memory
3538 switch (c
->d
& SrcMask
) {
3542 decode_register_operand(ctxt
, &c
->src
, c
, 0);
3551 memop
.bytes
= (c
->d
& ByteOp
) ? 1 :
3557 rc
= decode_imm(ctxt
, &c
->src
, 2, false);
3560 rc
= decode_imm(ctxt
, &c
->src
, imm_size(c
), true);
3563 rc
= decode_imm(ctxt
, &c
->src
, imm_size(c
), false);
3566 rc
= decode_imm(ctxt
, &c
->src
, 1, true);
3569 rc
= decode_imm(ctxt
, &c
->src
, 1, false);
3572 c
->src
.type
= OP_REG
;
3573 c
->src
.bytes
= (c
->d
& ByteOp
) ? 1 : c
->op_bytes
;
3574 c
->src
.addr
.reg
= &c
->regs
[VCPU_REGS_RAX
];
3575 fetch_register_operand(&c
->src
);
3582 c
->src
.type
= OP_MEM
;
3583 c
->src
.bytes
= (c
->d
& ByteOp
) ? 1 : c
->op_bytes
;
3584 c
->src
.addr
.mem
.ea
=
3585 register_address(c
, c
->regs
[VCPU_REGS_RSI
]);
3586 c
->src
.addr
.mem
.seg
= seg_override(ctxt
, c
);
3590 c
->src
.type
= OP_IMM
;
3591 c
->src
.addr
.mem
.ea
= c
->eip
;
3592 c
->src
.bytes
= c
->op_bytes
+ 2;
3593 insn_fetch_arr(c
->src
.valptr
, c
->src
.bytes
, c
->eip
);
3596 memop
.bytes
= c
->op_bytes
+ 2;
3601 if (rc
!= X86EMUL_CONTINUE
)
3605 * Decode and fetch the second source operand: register, memory
3608 switch (c
->d
& Src2Mask
) {
3613 c
->src2
.val
= c
->regs
[VCPU_REGS_RCX
] & 0x8;
3616 rc
= decode_imm(ctxt
, &c
->src2
, 1, true);
3623 rc
= decode_imm(ctxt
, &c
->src2
, imm_size(c
), true);
3627 if (rc
!= X86EMUL_CONTINUE
)
3630 /* Decode and fetch the destination operand: register or memory. */
3631 switch (c
->d
& DstMask
) {
3633 decode_register_operand(ctxt
, &c
->dst
, c
,
3634 c
->twobyte
&& (c
->b
== 0xb6 || c
->b
== 0xb7));
3637 c
->dst
.type
= OP_IMM
;
3638 c
->dst
.addr
.mem
.ea
= c
->eip
;
3640 c
->dst
.val
= insn_fetch(u8
, 1, c
->eip
);
3645 if ((c
->d
& DstMask
) == DstMem64
)
3648 c
->dst
.bytes
= (c
->d
& ByteOp
) ? 1 : c
->op_bytes
;
3650 fetch_bit_operand(c
);
3651 c
->dst
.orig_val
= c
->dst
.val
;
3654 c
->dst
.type
= OP_REG
;
3655 c
->dst
.bytes
= (c
->d
& ByteOp
) ? 1 : c
->op_bytes
;
3656 c
->dst
.addr
.reg
= &c
->regs
[VCPU_REGS_RAX
];
3657 fetch_register_operand(&c
->dst
);
3658 c
->dst
.orig_val
= c
->dst
.val
;
3661 c
->dst
.type
= OP_MEM
;
3662 c
->dst
.bytes
= (c
->d
& ByteOp
) ? 1 : c
->op_bytes
;
3663 c
->dst
.addr
.mem
.ea
=
3664 register_address(c
, c
->regs
[VCPU_REGS_RDI
]);
3665 c
->dst
.addr
.mem
.seg
= VCPU_SREG_ES
;
3669 /* Special instructions do their own operand decoding. */
3671 c
->dst
.type
= OP_NONE
; /* Disable writeback. */
3676 return (rc
== X86EMUL_UNHANDLEABLE
) ? EMULATION_FAILED
: EMULATION_OK
;
3679 static bool string_insn_completed(struct x86_emulate_ctxt
*ctxt
)
3681 struct decode_cache
*c
= &ctxt
->decode
;
3683 /* The second termination condition only applies for REPE
3684 * and REPNE. Test if the repeat string operation prefix is
3685 * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
3686 * corresponding termination condition according to:
3687 * - if REPE/REPZ and ZF = 0 then done
3688 * - if REPNE/REPNZ and ZF = 1 then done
3690 if (((c
->b
== 0xa6) || (c
->b
== 0xa7) ||
3691 (c
->b
== 0xae) || (c
->b
== 0xaf))
3692 && (((c
->rep_prefix
== REPE_PREFIX
) &&
3693 ((ctxt
->eflags
& EFLG_ZF
) == 0))
3694 || ((c
->rep_prefix
== REPNE_PREFIX
) &&
3695 ((ctxt
->eflags
& EFLG_ZF
) == EFLG_ZF
))))
3702 x86_emulate_insn(struct x86_emulate_ctxt
*ctxt
)
3704 struct x86_emulate_ops
*ops
= ctxt
->ops
;
3706 struct decode_cache
*c
= &ctxt
->decode
;
3707 int rc
= X86EMUL_CONTINUE
;
3708 int saved_dst_type
= c
->dst
.type
;
3709 int irq
; /* Used for int 3, int, and into */
3711 ctxt
->decode
.mem_read
.pos
= 0;
3713 if (ctxt
->mode
== X86EMUL_MODE_PROT64
&& (c
->d
& No64
)) {
3714 rc
= emulate_ud(ctxt
);
3718 /* LOCK prefix is allowed only with some instructions */
3719 if (c
->lock_prefix
&& (!(c
->d
& Lock
) || c
->dst
.type
!= OP_MEM
)) {
3720 rc
= emulate_ud(ctxt
);
3724 if ((c
->d
& SrcMask
) == SrcMemFAddr
&& c
->src
.type
!= OP_MEM
) {
3725 rc
= emulate_ud(ctxt
);
3730 && ((ops
->get_cr(ctxt
, 0) & X86_CR0_EM
)
3731 || !(ops
->get_cr(ctxt
, 4) & X86_CR4_OSFXSR
))) {
3732 rc
= emulate_ud(ctxt
);
3736 if ((c
->d
& Sse
) && (ops
->get_cr(ctxt
, 0) & X86_CR0_TS
)) {
3737 rc
= emulate_nm(ctxt
);
3741 if (unlikely(ctxt
->guest_mode
) && c
->intercept
) {
3742 rc
= emulator_check_intercept(ctxt
, c
->intercept
,
3743 X86_ICPT_PRE_EXCEPT
);
3744 if (rc
!= X86EMUL_CONTINUE
)
3748 /* Privileged instruction can be executed only in CPL=0 */
3749 if ((c
->d
& Priv
) && ops
->cpl(ctxt
)) {
3750 rc
= emulate_gp(ctxt
, 0);
3754 /* Instruction can only be executed in protected mode */
3755 if ((c
->d
& Prot
) && !(ctxt
->mode
& X86EMUL_MODE_PROT
)) {
3756 rc
= emulate_ud(ctxt
);
3760 /* Do instruction specific permission checks */
3761 if (c
->check_perm
) {
3762 rc
= c
->check_perm(ctxt
);
3763 if (rc
!= X86EMUL_CONTINUE
)
3767 if (unlikely(ctxt
->guest_mode
) && c
->intercept
) {
3768 rc
= emulator_check_intercept(ctxt
, c
->intercept
,
3769 X86_ICPT_POST_EXCEPT
);
3770 if (rc
!= X86EMUL_CONTINUE
)
3774 if (c
->rep_prefix
&& (c
->d
& String
)) {
3775 /* All REP prefixes have the same first termination condition */
3776 if (address_mask(c
, c
->regs
[VCPU_REGS_RCX
]) == 0) {
3782 if ((c
->src
.type
== OP_MEM
) && !(c
->d
& NoAccess
)) {
3783 rc
= segmented_read(ctxt
, c
->src
.addr
.mem
,
3784 c
->src
.valptr
, c
->src
.bytes
);
3785 if (rc
!= X86EMUL_CONTINUE
)
3787 c
->src
.orig_val64
= c
->src
.val64
;
3790 if (c
->src2
.type
== OP_MEM
) {
3791 rc
= segmented_read(ctxt
, c
->src2
.addr
.mem
,
3792 &c
->src2
.val
, c
->src2
.bytes
);
3793 if (rc
!= X86EMUL_CONTINUE
)
3797 if ((c
->d
& DstMask
) == ImplicitOps
)
3801 if ((c
->dst
.type
== OP_MEM
) && !(c
->d
& Mov
)) {
3802 /* optimisation - avoid slow emulated read if Mov */
3803 rc
= segmented_read(ctxt
, c
->dst
.addr
.mem
,
3804 &c
->dst
.val
, c
->dst
.bytes
);
3805 if (rc
!= X86EMUL_CONTINUE
)
3808 c
->dst
.orig_val
= c
->dst
.val
;
3812 if (unlikely(ctxt
->guest_mode
) && c
->intercept
) {
3813 rc
= emulator_check_intercept(ctxt
, c
->intercept
,
3814 X86_ICPT_POST_MEMACCESS
);
3815 if (rc
!= X86EMUL_CONTINUE
)
3820 rc
= c
->execute(ctxt
);
3821 if (rc
!= X86EMUL_CONTINUE
)
3830 case 0x06: /* push es */
3831 rc
= emulate_push_sreg(ctxt
, ops
, VCPU_SREG_ES
);
3833 case 0x07: /* pop es */
3834 rc
= emulate_pop_sreg(ctxt
, ops
, VCPU_SREG_ES
);
3836 case 0x0e: /* push cs */
3837 rc
= emulate_push_sreg(ctxt
, ops
, VCPU_SREG_CS
);
3839 case 0x16: /* push ss */
3840 rc
= emulate_push_sreg(ctxt
, ops
, VCPU_SREG_SS
);
3842 case 0x17: /* pop ss */
3843 rc
= emulate_pop_sreg(ctxt
, ops
, VCPU_SREG_SS
);
3845 case 0x1e: /* push ds */
3846 rc
= emulate_push_sreg(ctxt
, ops
, VCPU_SREG_DS
);
3848 case 0x1f: /* pop ds */
3849 rc
= emulate_pop_sreg(ctxt
, ops
, VCPU_SREG_DS
);
3851 case 0x40 ... 0x47: /* inc r16/r32 */
3852 emulate_1op("inc", c
->dst
, ctxt
->eflags
);
3854 case 0x48 ... 0x4f: /* dec r16/r32 */
3855 emulate_1op("dec", c
->dst
, ctxt
->eflags
);
3857 case 0x63: /* movsxd */
3858 if (ctxt
->mode
!= X86EMUL_MODE_PROT64
)
3859 goto cannot_emulate
;
3860 c
->dst
.val
= (s32
) c
->src
.val
;
3862 case 0x6c: /* insb */
3863 case 0x6d: /* insw/insd */
3864 c
->src
.val
= c
->regs
[VCPU_REGS_RDX
];
3866 case 0x6e: /* outsb */
3867 case 0x6f: /* outsw/outsd */
3868 c
->dst
.val
= c
->regs
[VCPU_REGS_RDX
];
3871 case 0x70 ... 0x7f: /* jcc (short) */
3872 if (test_cc(c
->b
, ctxt
->eflags
))
3873 jmp_rel(c
, c
->src
.val
);
3877 emulate_2op_SrcV("test", c
->src
, c
->dst
, ctxt
->eflags
);
3879 case 0x86 ... 0x87: /* xchg */
3881 /* Write back the register source. */
3882 c
->src
.val
= c
->dst
.val
;
3883 write_register_operand(&c
->src
);
3885 * Write back the memory destination with implicit LOCK
3888 c
->dst
.val
= c
->src
.orig_val
;
3891 case 0x8c: /* mov r/m, sreg */
3892 if (c
->modrm_reg
> VCPU_SREG_GS
) {
3893 rc
= emulate_ud(ctxt
);
3896 c
->dst
.val
= get_segment_selector(ctxt
, c
->modrm_reg
);
3898 case 0x8d: /* lea r16/r32, m */
3899 c
->dst
.val
= c
->src
.addr
.mem
.ea
;
3901 case 0x8e: { /* mov seg, r/m16 */
3906 if (c
->modrm_reg
== VCPU_SREG_CS
||
3907 c
->modrm_reg
> VCPU_SREG_GS
) {
3908 rc
= emulate_ud(ctxt
);
3912 if (c
->modrm_reg
== VCPU_SREG_SS
)
3913 ctxt
->interruptibility
= KVM_X86_SHADOW_INT_MOV_SS
;
3915 rc
= load_segment_descriptor(ctxt
, ops
, sel
, c
->modrm_reg
);
3917 c
->dst
.type
= OP_NONE
; /* Disable writeback. */
3920 case 0x8f: /* pop (sole member of Grp1a) */
3921 rc
= emulate_grp1a(ctxt
, ops
);
3923 case 0x90 ... 0x97: /* nop / xchg reg, rax */
3924 if (c
->dst
.addr
.reg
== &c
->regs
[VCPU_REGS_RAX
])
3927 case 0x98: /* cbw/cwde/cdqe */
3928 switch (c
->op_bytes
) {
3929 case 2: c
->dst
.val
= (s8
)c
->dst
.val
; break;
3930 case 4: c
->dst
.val
= (s16
)c
->dst
.val
; break;
3931 case 8: c
->dst
.val
= (s32
)c
->dst
.val
; break;
3934 case 0xa8 ... 0xa9: /* test ax, imm */
3939 case 0xc3: /* ret */
3940 c
->dst
.type
= OP_REG
;
3941 c
->dst
.addr
.reg
= &c
->eip
;
3942 c
->dst
.bytes
= c
->op_bytes
;
3945 case 0xc4: /* les */
3946 rc
= emulate_load_segment(ctxt
, ops
, VCPU_SREG_ES
);
3948 case 0xc5: /* lds */
3949 rc
= emulate_load_segment(ctxt
, ops
, VCPU_SREG_DS
);
3951 case 0xcb: /* ret far */
3952 rc
= emulate_ret_far(ctxt
, ops
);
3954 case 0xcc: /* int3 */
3957 case 0xcd: /* int n */
3960 rc
= emulate_int(ctxt
, ops
, irq
);
3962 case 0xce: /* into */
3963 if (ctxt
->eflags
& EFLG_OF
) {
3968 case 0xcf: /* iret */
3969 rc
= emulate_iret(ctxt
, ops
);
3971 case 0xd0 ... 0xd1: /* Grp2 */
3974 case 0xd2 ... 0xd3: /* Grp2 */
3975 c
->src
.val
= c
->regs
[VCPU_REGS_RCX
];
3978 case 0xe0 ... 0xe2: /* loop/loopz/loopnz */
3979 register_address_increment(c
, &c
->regs
[VCPU_REGS_RCX
], -1);
3980 if (address_mask(c
, c
->regs
[VCPU_REGS_RCX
]) != 0 &&
3981 (c
->b
== 0xe2 || test_cc(c
->b
^ 0x5, ctxt
->eflags
)))
3982 jmp_rel(c
, c
->src
.val
);
3984 case 0xe3: /* jcxz/jecxz/jrcxz */
3985 if (address_mask(c
, c
->regs
[VCPU_REGS_RCX
]) == 0)
3986 jmp_rel(c
, c
->src
.val
);
3988 case 0xe4: /* inb */
3991 case 0xe6: /* outb */
3992 case 0xe7: /* out */
3994 case 0xe8: /* call (near) */ {
3995 long int rel
= c
->src
.val
;
3996 c
->src
.val
= (unsigned long) c
->eip
;
4001 case 0xe9: /* jmp rel */
4003 case 0xea: { /* jmp far */
4006 memcpy(&sel
, c
->src
.valptr
+ c
->op_bytes
, 2);
4008 rc
= load_segment_descriptor(ctxt
, ops
, sel
, VCPU_SREG_CS
);
4009 if (rc
!= X86EMUL_CONTINUE
)
4013 memcpy(&c
->eip
, c
->src
.valptr
, c
->op_bytes
);
4017 jmp
: /* jmp rel short */
4018 jmp_rel(c
, c
->src
.val
);
4019 c
->dst
.type
= OP_NONE
; /* Disable writeback. */
4021 case 0xec: /* in al,dx */
4022 case 0xed: /* in (e/r)ax,dx */
4023 c
->src
.val
= c
->regs
[VCPU_REGS_RDX
];
4025 if (!pio_in_emulated(ctxt
, ops
, c
->dst
.bytes
, c
->src
.val
,
4027 goto done
; /* IO is needed */
4029 case 0xee: /* out dx,al */
4030 case 0xef: /* out dx,(e/r)ax */
4031 c
->dst
.val
= c
->regs
[VCPU_REGS_RDX
];
4033 ops
->pio_out_emulated(ctxt
, c
->src
.bytes
, c
->dst
.val
,
4035 c
->dst
.type
= OP_NONE
; /* Disable writeback. */
4037 case 0xf4: /* hlt */
4038 ctxt
->ops
->halt(ctxt
);
4040 case 0xf5: /* cmc */
4041 /* complement carry flag from eflags reg */
4042 ctxt
->eflags
^= EFLG_CF
;
4044 case 0xf6 ... 0xf7: /* Grp3 */
4045 rc
= emulate_grp3(ctxt
, ops
);
4047 case 0xf8: /* clc */
4048 ctxt
->eflags
&= ~EFLG_CF
;
4050 case 0xf9: /* stc */
4051 ctxt
->eflags
|= EFLG_CF
;
4053 case 0xfa: /* cli */
4054 if (emulator_bad_iopl(ctxt
, ops
)) {
4055 rc
= emulate_gp(ctxt
, 0);
4058 ctxt
->eflags
&= ~X86_EFLAGS_IF
;
4060 case 0xfb: /* sti */
4061 if (emulator_bad_iopl(ctxt
, ops
)) {
4062 rc
= emulate_gp(ctxt
, 0);
4065 ctxt
->interruptibility
= KVM_X86_SHADOW_INT_STI
;
4066 ctxt
->eflags
|= X86_EFLAGS_IF
;
4069 case 0xfc: /* cld */
4070 ctxt
->eflags
&= ~EFLG_DF
;
4072 case 0xfd: /* std */
4073 ctxt
->eflags
|= EFLG_DF
;
4075 case 0xfe: /* Grp4 */
4077 rc
= emulate_grp45(ctxt
);
4079 case 0xff: /* Grp5 */
4080 if (c
->modrm_reg
== 5)
4084 goto cannot_emulate
;
4087 if (rc
!= X86EMUL_CONTINUE
)
4091 rc
= writeback(ctxt
);
4092 if (rc
!= X86EMUL_CONTINUE
)
4096 * restore dst type in case the decoding will be reused
4097 * (happens for string instruction )
4099 c
->dst
.type
= saved_dst_type
;
4101 if ((c
->d
& SrcMask
) == SrcSI
)
4102 string_addr_inc(ctxt
, seg_override(ctxt
, c
),
4103 VCPU_REGS_RSI
, &c
->src
);
4105 if ((c
->d
& DstMask
) == DstDI
)
4106 string_addr_inc(ctxt
, VCPU_SREG_ES
, VCPU_REGS_RDI
,
4109 if (c
->rep_prefix
&& (c
->d
& String
)) {
4110 struct read_cache
*r
= &ctxt
->decode
.io_read
;
4111 register_address_increment(c
, &c
->regs
[VCPU_REGS_RCX
], -1);
4113 if (!string_insn_completed(ctxt
)) {
4115 * Re-enter guest when pio read ahead buffer is empty
4116 * or, if it is not used, after each 1024 iteration.
4118 if ((r
->end
!= 0 || c
->regs
[VCPU_REGS_RCX
] & 0x3ff) &&
4119 (r
->end
== 0 || r
->end
!= r
->pos
)) {
4121 * Reset read cache. Usually happens before
4122 * decode, but since instruction is restarted
4123 * we have to do it here.
4125 ctxt
->decode
.mem_read
.end
= 0;
4126 return EMULATION_RESTART
;
4128 goto done
; /* skip rip writeback */
4135 if (rc
== X86EMUL_PROPAGATE_FAULT
)
4136 ctxt
->have_exception
= true;
4137 if (rc
== X86EMUL_INTERCEPTED
)
4138 return EMULATION_INTERCEPTED
;
4140 return (rc
== X86EMUL_UNHANDLEABLE
) ? EMULATION_FAILED
: EMULATION_OK
;
4144 case 0x05: /* syscall */
4145 rc
= emulate_syscall(ctxt
, ops
);
4150 case 0x09: /* wbinvd */
4151 (ctxt
->ops
->wbinvd
)(ctxt
);
4153 case 0x08: /* invd */
4154 case 0x0d: /* GrpP (prefetch) */
4155 case 0x18: /* Grp16 (prefetch/nop) */
4157 case 0x20: /* mov cr, reg */
4158 c
->dst
.val
= ops
->get_cr(ctxt
, c
->modrm_reg
);
4160 case 0x21: /* mov from dr to reg */
4161 ops
->get_dr(ctxt
, c
->modrm_reg
, &c
->dst
.val
);
4163 case 0x22: /* mov reg, cr */
4164 if (ops
->set_cr(ctxt
, c
->modrm_reg
, c
->src
.val
)) {
4165 emulate_gp(ctxt
, 0);
4166 rc
= X86EMUL_PROPAGATE_FAULT
;
4169 c
->dst
.type
= OP_NONE
;
4171 case 0x23: /* mov from reg to dr */
4172 if (ops
->set_dr(ctxt
, c
->modrm_reg
, c
->src
.val
&
4173 ((ctxt
->mode
== X86EMUL_MODE_PROT64
) ?
4174 ~0ULL : ~0U)) < 0) {
4175 /* #UD condition is already handled by the code above */
4176 emulate_gp(ctxt
, 0);
4177 rc
= X86EMUL_PROPAGATE_FAULT
;
4181 c
->dst
.type
= OP_NONE
; /* no writeback */
4185 msr_data
= (u32
)c
->regs
[VCPU_REGS_RAX
]
4186 | ((u64
)c
->regs
[VCPU_REGS_RDX
] << 32);
4187 if (ops
->set_msr(ctxt
, c
->regs
[VCPU_REGS_RCX
], msr_data
)) {
4188 emulate_gp(ctxt
, 0);
4189 rc
= X86EMUL_PROPAGATE_FAULT
;
4192 rc
= X86EMUL_CONTINUE
;
4196 if (ops
->get_msr(ctxt
, c
->regs
[VCPU_REGS_RCX
], &msr_data
)) {
4197 emulate_gp(ctxt
, 0);
4198 rc
= X86EMUL_PROPAGATE_FAULT
;
4201 c
->regs
[VCPU_REGS_RAX
] = (u32
)msr_data
;
4202 c
->regs
[VCPU_REGS_RDX
] = msr_data
>> 32;
4204 rc
= X86EMUL_CONTINUE
;
4206 case 0x34: /* sysenter */
4207 rc
= emulate_sysenter(ctxt
, ops
);
4209 case 0x35: /* sysexit */
4210 rc
= emulate_sysexit(ctxt
, ops
);
4212 case 0x40 ... 0x4f: /* cmov */
4213 c
->dst
.val
= c
->dst
.orig_val
= c
->src
.val
;
4214 if (!test_cc(c
->b
, ctxt
->eflags
))
4215 c
->dst
.type
= OP_NONE
; /* no writeback */
4217 case 0x80 ... 0x8f: /* jnz rel, etc*/
4218 if (test_cc(c
->b
, ctxt
->eflags
))
4219 jmp_rel(c
, c
->src
.val
);
4221 case 0x90 ... 0x9f: /* setcc r/m8 */
4222 c
->dst
.val
= test_cc(c
->b
, ctxt
->eflags
);
4224 case 0xa0: /* push fs */
4225 rc
= emulate_push_sreg(ctxt
, ops
, VCPU_SREG_FS
);
4227 case 0xa1: /* pop fs */
4228 rc
= emulate_pop_sreg(ctxt
, ops
, VCPU_SREG_FS
);
4232 c
->dst
.type
= OP_NONE
;
4233 /* only subword offset */
4234 c
->src
.val
&= (c
->dst
.bytes
<< 3) - 1;
4235 emulate_2op_SrcV_nobyte("bt", c
->src
, c
->dst
, ctxt
->eflags
);
4237 case 0xa4: /* shld imm8, r, r/m */
4238 case 0xa5: /* shld cl, r, r/m */
4239 emulate_2op_cl("shld", c
->src2
, c
->src
, c
->dst
, ctxt
->eflags
);
4241 case 0xa8: /* push gs */
4242 rc
= emulate_push_sreg(ctxt
, ops
, VCPU_SREG_GS
);
4244 case 0xa9: /* pop gs */
4245 rc
= emulate_pop_sreg(ctxt
, ops
, VCPU_SREG_GS
);
4249 emulate_2op_SrcV_nobyte("bts", c
->src
, c
->dst
, ctxt
->eflags
);
4251 case 0xac: /* shrd imm8, r, r/m */
4252 case 0xad: /* shrd cl, r, r/m */
4253 emulate_2op_cl("shrd", c
->src2
, c
->src
, c
->dst
, ctxt
->eflags
);
4255 case 0xae: /* clflush */
4257 case 0xb0 ... 0xb1: /* cmpxchg */
4259 * Save real source value, then compare EAX against
4262 c
->src
.orig_val
= c
->src
.val
;
4263 c
->src
.val
= c
->regs
[VCPU_REGS_RAX
];
4264 emulate_2op_SrcV("cmp", c
->src
, c
->dst
, ctxt
->eflags
);
4265 if (ctxt
->eflags
& EFLG_ZF
) {
4266 /* Success: write back to memory. */
4267 c
->dst
.val
= c
->src
.orig_val
;
4269 /* Failure: write the value we saw to EAX. */
4270 c
->dst
.type
= OP_REG
;
4271 c
->dst
.addr
.reg
= (unsigned long *)&c
->regs
[VCPU_REGS_RAX
];
4274 case 0xb2: /* lss */
4275 rc
= emulate_load_segment(ctxt
, ops
, VCPU_SREG_SS
);
4279 emulate_2op_SrcV_nobyte("btr", c
->src
, c
->dst
, ctxt
->eflags
);
4281 case 0xb4: /* lfs */
4282 rc
= emulate_load_segment(ctxt
, ops
, VCPU_SREG_FS
);
4284 case 0xb5: /* lgs */
4285 rc
= emulate_load_segment(ctxt
, ops
, VCPU_SREG_GS
);
4287 case 0xb6 ... 0xb7: /* movzx */
4288 c
->dst
.bytes
= c
->op_bytes
;
4289 c
->dst
.val
= (c
->d
& ByteOp
) ? (u8
) c
->src
.val
4292 case 0xba: /* Grp8 */
4293 switch (c
->modrm_reg
& 3) {
4306 emulate_2op_SrcV_nobyte("btc", c
->src
, c
->dst
, ctxt
->eflags
);
4308 case 0xbc: { /* bsf */
4310 __asm__ ("bsf %2, %0; setz %1"
4311 : "=r"(c
->dst
.val
), "=q"(zf
)
4313 ctxt
->eflags
&= ~X86_EFLAGS_ZF
;
4315 ctxt
->eflags
|= X86_EFLAGS_ZF
;
4316 c
->dst
.type
= OP_NONE
; /* Disable writeback. */
4320 case 0xbd: { /* bsr */
4322 __asm__ ("bsr %2, %0; setz %1"
4323 : "=r"(c
->dst
.val
), "=q"(zf
)
4325 ctxt
->eflags
&= ~X86_EFLAGS_ZF
;
4327 ctxt
->eflags
|= X86_EFLAGS_ZF
;
4328 c
->dst
.type
= OP_NONE
; /* Disable writeback. */
4332 case 0xbe ... 0xbf: /* movsx */
4333 c
->dst
.bytes
= c
->op_bytes
;
4334 c
->dst
.val
= (c
->d
& ByteOp
) ? (s8
) c
->src
.val
:
4337 case 0xc0 ... 0xc1: /* xadd */
4338 emulate_2op_SrcV("add", c
->src
, c
->dst
, ctxt
->eflags
);
4339 /* Write back the register source. */
4340 c
->src
.val
= c
->dst
.orig_val
;
4341 write_register_operand(&c
->src
);
4343 case 0xc3: /* movnti */
4344 c
->dst
.bytes
= c
->op_bytes
;
4345 c
->dst
.val
= (c
->op_bytes
== 4) ? (u32
) c
->src
.val
:
4348 case 0xc7: /* Grp9 (cmpxchg8b) */
4349 rc
= emulate_grp9(ctxt
, ops
);
4352 goto cannot_emulate
;
4355 if (rc
!= X86EMUL_CONTINUE
)
4361 return EMULATION_FAILED
;