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KVM: x86: Wrong emulation on 'xadd X, X'
[mirror_ubuntu-bionic-kernel.git] / arch / x86 / kvm / emulate.c
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6aa8b732 1/******************************************************************************
56e82318 2 * emulate.c
6aa8b732
AK		 3 *
4 * Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
5 *
6 * Copyright (c) 2005 Keir Fraser
7 *
8 * Linux coding style, mod r/m decoder, segment base fixes, real-mode
dcc0766b 9 * privileged instructions:
6aa8b732
AK		 10 *
11 * Copyright (C) 2006 Qumranet
9611c187 12 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
6aa8b732
AK		 13 *
14 * Avi Kivity <avi@qumranet.com>
15 * Yaniv Kamay <yaniv@qumranet.com>
16 *
17 * This work is licensed under the terms of the GNU GPL, version 2. See
18 * the COPYING file in the top-level directory.
19 *
20 * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
21 */
22
edf88417 23#include <linux/kvm_host.h>
5fdbf976 24#include "kvm_cache_regs.h"
6aa8b732 25#include <linux/module.h>
56e82318 26#include <asm/kvm_emulate.h>
b7d491e7 27#include <linux/stringify.h>
6aa8b732 28
3eeb3288 29#include "x86.h"
38ba30ba 30#include "tss.h"
e99f0507 31
a9945549
AK		 32/*
33 * Operand types
34 */
b1ea50b2
AK		 35#define OpNone 0ull
36#define OpImplicit 1ull /* No generic decode */
37#define OpReg 2ull /* Register */
38#define OpMem 3ull /* Memory */
39#define OpAcc 4ull /* Accumulator: AL/AX/EAX/RAX */
40#define OpDI 5ull /* ES:DI/EDI/RDI */
41#define OpMem64 6ull /* Memory, 64-bit */
42#define OpImmUByte 7ull /* Zero-extended 8-bit immediate */
43#define OpDX 8ull /* DX register */
4dd6a57d
AK		 44#define OpCL 9ull /* CL register (for shifts) */
45#define OpImmByte 10ull /* 8-bit sign extended immediate */
46#define OpOne 11ull /* Implied 1 */
5e2c6883 47#define OpImm 12ull /* Sign extended up to 32-bit immediate */
0fe59128
AK		 48#define OpMem16 13ull /* Memory operand (16-bit). */
49#define OpMem32 14ull /* Memory operand (32-bit). */
50#define OpImmU 15ull /* Immediate operand, zero extended */
51#define OpSI 16ull /* SI/ESI/RSI */
52#define OpImmFAddr 17ull /* Immediate far address */
53#define OpMemFAddr 18ull /* Far address in memory */
54#define OpImmU16 19ull /* Immediate operand, 16 bits, zero extended */
c191a7a0
AK		 55#define OpES 20ull /* ES */
56#define OpCS 21ull /* CS */
57#define OpSS 22ull /* SS */
58#define OpDS 23ull /* DS */
59#define OpFS 24ull /* FS */
60#define OpGS 25ull /* GS */
28867cee 61#define OpMem8 26ull /* 8-bit zero extended memory operand */
5e2c6883 62#define OpImm64 27ull /* Sign extended 16/32/64-bit immediate */
7fa57952 63#define OpXLat 28ull /* memory at BX/EBX/RBX + zero-extended AL */
820207c8
AK		 64#define OpAccLo 29ull /* Low part of extended acc (AX/AX/EAX/RAX) */
65#define OpAccHi 30ull /* High part of extended acc (-/DX/EDX/RDX) */
0fe59128
AK		 66
67#define OpBits 5 /* Width of operand field */
b1ea50b2 68#define OpMask ((1ull << OpBits) - 1)
a9945549 69
6aa8b732
AK		 70/*
71 * Opcode effective-address decode tables.
72 * Note that we only emulate instructions that have at least one memory
73 * operand (excluding implicit stack references). We assume that stack
74 * references and instruction fetches will never occur in special memory
75 * areas that require emulation. So, for example, 'mov <imm>,<reg>' need
76 * not be handled.
77 */
78
79/* Operand sizes: 8-bit operands or specified/overridden size. */
ab85b12b 80#define ByteOp (1<<0) /* 8-bit operands. */
6aa8b732 81/* Destination operand type. */
a9945549
AK		 82#define DstShift 1
83#define ImplicitOps (OpImplicit << DstShift)
84#define DstReg (OpReg << DstShift)
85#define DstMem (OpMem << DstShift)
86#define DstAcc (OpAcc << DstShift)
87#define DstDI (OpDI << DstShift)
88#define DstMem64 (OpMem64 << DstShift)
89#define DstImmUByte (OpImmUByte << DstShift)
90#define DstDX (OpDX << DstShift)
820207c8 91#define DstAccLo (OpAccLo << DstShift)
a9945549 92#define DstMask (OpMask << DstShift)
6aa8b732 93/* Source operand type. */
0fe59128
AK		 94#define SrcShift 6
95#define SrcNone (OpNone << SrcShift)
96#define SrcReg (OpReg << SrcShift)
97#define SrcMem (OpMem << SrcShift)
98#define SrcMem16 (OpMem16 << SrcShift)
99#define SrcMem32 (OpMem32 << SrcShift)
100#define SrcImm (OpImm << SrcShift)
101#define SrcImmByte (OpImmByte << SrcShift)
102#define SrcOne (OpOne << SrcShift)
103#define SrcImmUByte (OpImmUByte << SrcShift)
104#define SrcImmU (OpImmU << SrcShift)
105#define SrcSI (OpSI << SrcShift)
7fa57952 106#define SrcXLat (OpXLat << SrcShift)
0fe59128
AK		 107#define SrcImmFAddr (OpImmFAddr << SrcShift)
108#define SrcMemFAddr (OpMemFAddr << SrcShift)
109#define SrcAcc (OpAcc << SrcShift)
110#define SrcImmU16 (OpImmU16 << SrcShift)
5e2c6883 111#define SrcImm64 (OpImm64 << SrcShift)
0fe59128 112#define SrcDX (OpDX << SrcShift)
28867cee 113#define SrcMem8 (OpMem8 << SrcShift)
820207c8 114#define SrcAccHi (OpAccHi << SrcShift)
0fe59128 115#define SrcMask (OpMask << SrcShift)
221192bd
MT		 116#define BitOp (1<<11)
117#define MemAbs (1<<12) /* Memory operand is absolute displacement */
118#define String (1<<13) /* String instruction (rep capable) */
119#define Stack (1<<14) /* Stack instruction (push/pop) */
120#define GroupMask (7<<15) /* Opcode uses one of the group mechanisms */
121#define Group (1<<15) /* Bits 3:5 of modrm byte extend opcode */
122#define GroupDual (2<<15) /* Alternate decoding of mod == 3 */
123#define Prefix (3<<15) /* Instruction varies with 66/f2/f3 prefix */
124#define RMExt (4<<15) /* Opcode extension in ModRM r/m if mod == 3 */
045a282c 125#define Escape (5<<15) /* Escape to coprocessor instruction */
221192bd 126#define Sse (1<<18) /* SSE Vector instruction */
20c29ff2
AK		 127/* Generic ModRM decode. */
128#define ModRM (1<<19)
129/* Destination is only written; never read. */
130#define Mov (1<<20)
d8769fed 131/* Misc flags */
8ea7d6ae 132#define Prot (1<<21) /* instruction generates #UD if not in prot-mode */
b51e974f 133#define EmulateOnUD (1<<22) /* Emulate if unsupported by the host */
5a506b12 134#define NoAccess (1<<23) /* Don't access memory (lea/invlpg/verr etc) */
7f9b4b75 135#define Op3264 (1<<24) /* Operand is 64b in long mode, 32b otherwise */
047a4818 136#define Undefined (1<<25) /* No Such Instruction */
d380a5e4 137#define Lock (1<<26) /* lock prefix is allowed for the instruction */
e92805ac 138#define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */
d8769fed 139#define No64 (1<<28)
d5ae7ce8 140#define PageTable (1 << 29) /* instruction used to write page table */
0b789eee 141#define NotImpl (1 << 30) /* instruction is not implemented */
0dc8d10f 142/* Source 2 operand type */
0b789eee 143#define Src2Shift (31)
4dd6a57d 144#define Src2None (OpNone << Src2Shift)
ab2c5ce6 145#define Src2Mem (OpMem << Src2Shift)
4dd6a57d
AK		 146#define Src2CL (OpCL << Src2Shift)
147#define Src2ImmByte (OpImmByte << Src2Shift)
148#define Src2One (OpOne << Src2Shift)
149#define Src2Imm (OpImm << Src2Shift)
c191a7a0
AK		 150#define Src2ES (OpES << Src2Shift)
151#define Src2CS (OpCS << Src2Shift)
152#define Src2SS (OpSS << Src2Shift)
153#define Src2DS (OpDS << Src2Shift)
154#define Src2FS (OpFS << Src2Shift)
155#define Src2GS (OpGS << Src2Shift)
4dd6a57d 156#define Src2Mask (OpMask << Src2Shift)
cbe2c9d3 157#define Mmx ((u64)1 << 40) /* MMX Vector instruction */
1c11b376
AK		 158#define Aligned ((u64)1 << 41) /* Explicitly aligned (e.g. MOVDQA) */
159#define Unaligned ((u64)1 << 42) /* Explicitly unaligned (e.g. MOVDQU) */
160#define Avx ((u64)1 << 43) /* Advanced Vector Extensions */
e28bbd44 161#define Fastop ((u64)1 << 44) /* Use opcode::u.fastop */
b6744dc3 162#define NoWrite ((u64)1 << 45) /* No writeback */
fb32b1ed 163#define SrcWrite ((u64)1 << 46) /* Write back src operand */
9b88ae99 164#define NoMod ((u64)1 << 47) /* Mod field is ignored */
6aa8b732 165
820207c8 166#define DstXacc (DstAccLo | SrcAccHi | SrcWrite)
6aa8b732 167
d0e53325
AK		 168#define X2(x...) x, x
169#define X3(x...) X2(x), x
170#define X4(x...) X2(x), X2(x)
171#define X5(x...) X4(x), x
172#define X6(x...) X4(x), X2(x)
173#define X7(x...) X4(x), X3(x)
174#define X8(x...) X4(x), X4(x)
175#define X16(x...) X8(x), X8(x)
83babbca 176
e28bbd44
AK		 177#define NR_FASTOP (ilog2(sizeof(ulong)) + 1)
178#define FASTOP_SIZE 8
179
180/*
181 * fastop functions have a special calling convention:
182 *
017da7b6
AK		 183 * dst: rax (in/out)
184 * src: rdx (in/out)
e28bbd44
AK		 185 * src2: rcx (in)
186 * flags: rflags (in/out)
b8c0b6ae 187 * ex: rsi (in:fastop pointer, out:zero if exception)
e28bbd44
AK		 188 *
189 * Moreover, they are all exactly FASTOP_SIZE bytes long, so functions for
190 * different operand sizes can be reached by calculation, rather than a jump
191 * table (which would be bigger than the code).
192 *
193 * fastop functions are declared as taking a never-defined fastop parameter,
194 * so they can't be called from C directly.
195 */
196
197struct fastop;
198
d65b1dee 199struct opcode {
b1ea50b2
AK		 200 u64 flags : 56;
201 u64 intercept : 8;
120df890 202 union {
ef65c889 203 int (*execute)(struct x86_emulate_ctxt *ctxt);
fd0a0d82
MK		 204 const struct opcode *group;
205 const struct group_dual *gdual;
206 const struct gprefix *gprefix;
045a282c 207 const struct escape *esc;
e28bbd44 208 void (*fastop)(struct fastop *fake);
120df890 209 } u;
d09beabd 210 int (*check_perm)(struct x86_emulate_ctxt *ctxt);
120df890
AK		 211};
212
213struct group_dual {
214 struct opcode mod012[8];
215 struct opcode mod3[8];
d65b1dee
AK		 216};
217
0d7cdee8
AK		 218struct gprefix {
219 struct opcode pfx_no;
220 struct opcode pfx_66;
221 struct opcode pfx_f2;
222 struct opcode pfx_f3;
223};
224
045a282c
GN		 225struct escape {
226 struct opcode op[8];
227 struct opcode high[64];
228};
229
6aa8b732 230/* EFLAGS bit definitions. */
d4c6a154
GN		 231#define EFLG_ID (1<<21)
232#define EFLG_VIP (1<<20)
233#define EFLG_VIF (1<<19)
234#define EFLG_AC (1<<18)
b1d86143
AP		 235#define EFLG_VM (1<<17)
236#define EFLG_RF (1<<16)
d4c6a154
GN		 237#define EFLG_IOPL (3<<12)
238#define EFLG_NT (1<<14)
6aa8b732
AK		 239#define EFLG_OF (1<<11)
240#define EFLG_DF (1<<10)
b1d86143 241#define EFLG_IF (1<<9)
d4c6a154 242#define EFLG_TF (1<<8)
6aa8b732
AK		 243#define EFLG_SF (1<<7)
244#define EFLG_ZF (1<<6)
245#define EFLG_AF (1<<4)
246#define EFLG_PF (1<<2)
247#define EFLG_CF (1<<0)
248
62bd430e
MG		 249#define EFLG_RESERVED_ZEROS_MASK 0xffc0802a
250#define EFLG_RESERVED_ONE_MASK 2
251
dd856efa
AK		 252static ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr)
253{
254 if (!(ctxt->regs_valid & (1 << nr))) {
255 ctxt->regs_valid |= 1 << nr;
256 ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr);
257 }
258 return ctxt->_regs[nr];
259}
260
261static ulong *reg_write(struct x86_emulate_ctxt *ctxt, unsigned nr)
262{
263 ctxt->regs_valid |= 1 << nr;
264 ctxt->regs_dirty |= 1 << nr;
265 return &ctxt->_regs[nr];
266}
267
268static ulong *reg_rmw(struct x86_emulate_ctxt *ctxt, unsigned nr)
269{
270 reg_read(ctxt, nr);
271 return reg_write(ctxt, nr);
272}
273
274static void writeback_registers(struct x86_emulate_ctxt *ctxt)
275{
276 unsigned reg;
277
278 for_each_set_bit(reg, (ulong *)&ctxt->regs_dirty, 16)
279 ctxt->ops->write_gpr(ctxt, reg, ctxt->_regs[reg]);
280}
281
282static void invalidate_registers(struct x86_emulate_ctxt *ctxt)
283{
284 ctxt->regs_dirty = 0;
285 ctxt->regs_valid = 0;
286}
287
6aa8b732
AK		 288/*
289 * These EFLAGS bits are restored from saved value during emulation, and
290 * any changes are written back to the saved value after emulation.
291 */
292#define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF)
293
dda96d8f
AK		 294#ifdef CONFIG_X86_64
295#define ON64(x) x
296#else
297#define ON64(x)
298#endif
299
4d758349
AK		 300static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *));
301
b7d491e7
AK		 302#define FOP_ALIGN ".align " __stringify(FASTOP_SIZE) " \n\t"
303#define FOP_RET "ret \n\t"
304
305#define FOP_START(op) \
306 extern void em_##op(struct fastop *fake); \
307 asm(".pushsection .text, \"ax\" \n\t" \
308 ".global em_" #op " \n\t" \
309 FOP_ALIGN \
310 "em_" #op ": \n\t"
311
312#define FOP_END \
313 ".popsection")
314
0bdea068
AK		 315#define FOPNOP() FOP_ALIGN FOP_RET
316
b7d491e7 317#define FOP1E(op, dst) \
b8c0b6ae
AK		 318 FOP_ALIGN "10: " #op " %" #dst " \n\t" FOP_RET
319
320#define FOP1EEX(op, dst) \
321 FOP1E(op, dst) _ASM_EXTABLE(10b, kvm_fastop_exception)
b7d491e7
AK		 322
323#define FASTOP1(op) \
324 FOP_START(op) \
325 FOP1E(op##b, al) \
326 FOP1E(op##w, ax) \
327 FOP1E(op##l, eax) \
328 ON64(FOP1E(op##q, rax)) \
329 FOP_END
330
b9fa409b
AK		 331/* 1-operand, using src2 (for MUL/DIV r/m) */
332#define FASTOP1SRC2(op, name) \
333 FOP_START(name) \
334 FOP1E(op, cl) \
335 FOP1E(op, cx) \
336 FOP1E(op, ecx) \
337 ON64(FOP1E(op, rcx)) \
338 FOP_END
339
b8c0b6ae
AK		 340/* 1-operand, using src2 (for MUL/DIV r/m), with exceptions */
341#define FASTOP1SRC2EX(op, name) \
342 FOP_START(name) \
343 FOP1EEX(op, cl) \
344 FOP1EEX(op, cx) \
345 FOP1EEX(op, ecx) \
346 ON64(FOP1EEX(op, rcx)) \
347 FOP_END
348
f7857f35
AK		 349#define FOP2E(op, dst, src) \
350 FOP_ALIGN #op " %" #src ", %" #dst " \n\t" FOP_RET
351
352#define FASTOP2(op) \
353 FOP_START(op) \
017da7b6
AK		 354 FOP2E(op##b, al, dl) \
355 FOP2E(op##w, ax, dx) \
356 FOP2E(op##l, eax, edx) \
357 ON64(FOP2E(op##q, rax, rdx)) \
f7857f35
AK		 358 FOP_END
359
11c363ba
AK		 360/* 2 operand, word only */
361#define FASTOP2W(op) \
362 FOP_START(op) \
363 FOPNOP() \
017da7b6
AK		 364 FOP2E(op##w, ax, dx) \
365 FOP2E(op##l, eax, edx) \
366 ON64(FOP2E(op##q, rax, rdx)) \
11c363ba
AK		 367 FOP_END
368
007a3b54
AK		 369/* 2 operand, src is CL */
370#define FASTOP2CL(op) \
371 FOP_START(op) \
372 FOP2E(op##b, al, cl) \
373 FOP2E(op##w, ax, cl) \
374 FOP2E(op##l, eax, cl) \
375 ON64(FOP2E(op##q, rax, cl)) \
376 FOP_END
377
0bdea068
AK		 378#define FOP3E(op, dst, src, src2) \
379 FOP_ALIGN #op " %" #src2 ", %" #src ", %" #dst " \n\t" FOP_RET
380
381/* 3-operand, word-only, src2=cl */
382#define FASTOP3WCL(op) \
383 FOP_START(op) \
384 FOPNOP() \
017da7b6
AK		 385 FOP3E(op##w, ax, dx, cl) \
386 FOP3E(op##l, eax, edx, cl) \
387 ON64(FOP3E(op##q, rax, rdx, cl)) \
0bdea068
AK		 388 FOP_END
389
9ae9feba
AK		 390/* Special case for SETcc - 1 instruction per cc */
391#define FOP_SETCC(op) ".align 4; " #op " %al; ret \n\t"
392
b8c0b6ae
AK		 393asm(".global kvm_fastop_exception \n"
394 "kvm_fastop_exception: xor %esi, %esi; ret");
395
9ae9feba
AK		 396FOP_START(setcc)
397FOP_SETCC(seto)
398FOP_SETCC(setno)
399FOP_SETCC(setc)
400FOP_SETCC(setnc)
401FOP_SETCC(setz)
402FOP_SETCC(setnz)
403FOP_SETCC(setbe)
404FOP_SETCC(setnbe)
405FOP_SETCC(sets)
406FOP_SETCC(setns)
407FOP_SETCC(setp)
408FOP_SETCC(setnp)
409FOP_SETCC(setl)
410FOP_SETCC(setnl)
411FOP_SETCC(setle)
412FOP_SETCC(setnle)
413FOP_END;
414
326f578f
PB		 415FOP_START(salc) "pushf; sbb %al, %al; popf \n\t" FOP_RET
416FOP_END;
417
8a76d7f2
JR		 418static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt,
419 enum x86_intercept intercept,
420 enum x86_intercept_stage stage)
421{
422 struct x86_instruction_info info = {
423 .intercept = intercept,
9dac77fa
AK		 424 .rep_prefix = ctxt->rep_prefix,
425 .modrm_mod = ctxt->modrm_mod,
426 .modrm_reg = ctxt->modrm_reg,
427 .modrm_rm = ctxt->modrm_rm,
428 .src_val = ctxt->src.val64,
429 .src_bytes = ctxt->src.bytes,
430 .dst_bytes = ctxt->dst.bytes,
431 .ad_bytes = ctxt->ad_bytes,
8a76d7f2
JR		 432 .next_rip = ctxt->eip,
433 };
434
2953538e 435 return ctxt->ops->intercept(ctxt, &info, stage);
8a76d7f2
JR		 436}
437
f47cfa31
AK		 438static void assign_masked(ulong *dest, ulong src, ulong mask)
439{
440 *dest = (*dest & ~mask) | (src & mask);
441}
442
9dac77fa 443static inline unsigned long ad_mask(struct x86_emulate_ctxt *ctxt)
ddcb2885 444{
9dac77fa 445 return (1UL << (ctxt->ad_bytes << 3)) - 1;
ddcb2885
HH		 446}
447
f47cfa31
AK		 448static ulong stack_mask(struct x86_emulate_ctxt *ctxt)
449{
450 u16 sel;
451 struct desc_struct ss;
452
453 if (ctxt->mode == X86EMUL_MODE_PROT64)
454 return ~0UL;
455 ctxt->ops->get_segment(ctxt, &sel, &ss, NULL, VCPU_SREG_SS);
456 return ~0U >> ((ss.d ^ 1) * 16); /* d=0: 0xffff; d=1: 0xffffffff */
457}
458
612e89f0
AK		 459static int stack_size(struct x86_emulate_ctxt *ctxt)
460{
461 return (__fls(stack_mask(ctxt)) + 1) >> 3;
462}
463
6aa8b732 464/* Access/update address held in a register, based on addressing mode. */
e4706772 465static inline unsigned long
9dac77fa 466address_mask(struct x86_emulate_ctxt *ctxt, unsigned long reg)
e4706772 467{
9dac77fa 468 if (ctxt->ad_bytes == sizeof(unsigned long))
e4706772
HH		 469 return reg;
470 else
9dac77fa 471 return reg & ad_mask(ctxt);
e4706772
HH		 472}
473
474static inline unsigned long
9dac77fa 475register_address(struct x86_emulate_ctxt *ctxt, unsigned long reg)
e4706772 476{
9dac77fa 477 return address_mask(ctxt, reg);
e4706772
HH		 478}
479
5ad105e5
AK		 480static void masked_increment(ulong *reg, ulong mask, int inc)
481{
482 assign_masked(reg, *reg + inc, mask);
483}
484
7a957275 485static inline void
9dac77fa 486register_address_increment(struct x86_emulate_ctxt *ctxt, unsigned long *reg, int inc)
7a957275 487{
5ad105e5
AK		 488 ulong mask;
489
9dac77fa 490 if (ctxt->ad_bytes == sizeof(unsigned long))
5ad105e5 491 mask = ~0UL;
7a957275 492 else
5ad105e5
AK		 493 mask = ad_mask(ctxt);
494 masked_increment(reg, mask, inc);
495}
496
497static void rsp_increment(struct x86_emulate_ctxt *ctxt, int inc)
498{
dd856efa 499 masked_increment(reg_rmw(ctxt, VCPU_REGS_RSP), stack_mask(ctxt), inc);
7a957275 500}
6aa8b732 501
9dac77fa 502static inline void jmp_rel(struct x86_emulate_ctxt *ctxt, int rel)
7a957275 503{
9dac77fa 504 register_address_increment(ctxt, &ctxt->_eip, rel);
7a957275 505}
098c937b 506
56697687
AK		 507static u32 desc_limit_scaled(struct desc_struct *desc)
508{
509 u32 limit = get_desc_limit(desc);
510
511 return desc->g ? (limit << 12) | 0xfff : limit;
512}
513
9dac77fa 514static void set_seg_override(struct x86_emulate_ctxt *ctxt, int seg)
7a5b56df 515{
9dac77fa
AK		 516 ctxt->has_seg_override = true;
517 ctxt->seg_override = seg;
7a5b56df
AK		 518}
519
7b105ca2 520static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg)
7a5b56df
AK		 521{
522 if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS)
523 return 0;
524
7b105ca2 525 return ctxt->ops->get_cached_segment_base(ctxt, seg);
7a5b56df
AK		 526}
527
9dac77fa 528static unsigned seg_override(struct x86_emulate_ctxt *ctxt)
7a5b56df 529{
9dac77fa 530 if (!ctxt->has_seg_override)
7a5b56df
AK		 531 return 0;
532
9dac77fa 533 return ctxt->seg_override;
7a5b56df
AK		 534}
535
35d3d4a1
AK		 536static int emulate_exception(struct x86_emulate_ctxt *ctxt, int vec,
537 u32 error, bool valid)
54b8486f 538{
da9cb575
AK		 539 ctxt->exception.vector = vec;
540 ctxt->exception.error_code = error;
541 ctxt->exception.error_code_valid = valid;
35d3d4a1 542 return X86EMUL_PROPAGATE_FAULT;
54b8486f
GN		 543}
544
3b88e41a
JR		 545static int emulate_db(struct x86_emulate_ctxt *ctxt)
546{
547 return emulate_exception(ctxt, DB_VECTOR, 0, false);
548}
549
35d3d4a1 550static int emulate_gp(struct x86_emulate_ctxt *ctxt, int err)
54b8486f 551{
35d3d4a1 552 return emulate_exception(ctxt, GP_VECTOR, err, true);
54b8486f
GN		 553}
554
618ff15d
AK		 555static int emulate_ss(struct x86_emulate_ctxt *ctxt, int err)
556{
557 return emulate_exception(ctxt, SS_VECTOR, err, true);
558}
559
35d3d4a1 560static int emulate_ud(struct x86_emulate_ctxt *ctxt)
54b8486f 561{
35d3d4a1 562 return emulate_exception(ctxt, UD_VECTOR, 0, false);
54b8486f
GN		 563}
564
35d3d4a1 565static int emulate_ts(struct x86_emulate_ctxt *ctxt, int err)
54b8486f 566{
35d3d4a1 567 return emulate_exception(ctxt, TS_VECTOR, err, true);
54b8486f
GN		 568}
569
34d1f490
AK		 570static int emulate_de(struct x86_emulate_ctxt *ctxt)
571{
35d3d4a1 572 return emulate_exception(ctxt, DE_VECTOR, 0, false);
34d1f490
AK		 573}
574
1253791d
AK		 575static int emulate_nm(struct x86_emulate_ctxt *ctxt)
576{
577 return emulate_exception(ctxt, NM_VECTOR, 0, false);
578}
579
1aa36616
AK		 580static u16 get_segment_selector(struct x86_emulate_ctxt *ctxt, unsigned seg)
581{
582 u16 selector;
583 struct desc_struct desc;
584
585 ctxt->ops->get_segment(ctxt, &selector, &desc, NULL, seg);
586 return selector;
587}
588
589static void set_segment_selector(struct x86_emulate_ctxt *ctxt, u16 selector,
590 unsigned seg)
591{
592 u16 dummy;
593 u32 base3;
594 struct desc_struct desc;
595
596 ctxt->ops->get_segment(ctxt, &dummy, &desc, &base3, seg);
597 ctxt->ops->set_segment(ctxt, selector, &desc, base3, seg);
598}
599
1c11b376
AK		 600/*
601 * x86 defines three classes of vector instructions: explicitly
602 * aligned, explicitly unaligned, and the rest, which change behaviour
603 * depending on whether they're AVX encoded or not.
604 *
605 * Also included is CMPXCHG16B which is not a vector instruction, yet it is
606 * subject to the same check.
607 */
608static bool insn_aligned(struct x86_emulate_ctxt *ctxt, unsigned size)
609{
610 if (likely(size < 16))
611 return false;
612
613 if (ctxt->d & Aligned)
614 return true;
615 else if (ctxt->d & Unaligned)
616 return false;
617 else if (ctxt->d & Avx)
618 return false;
619 else
620 return true;
621}
622
3d9b938e 623static int __linearize(struct x86_emulate_ctxt *ctxt,
52fd8b44 624 struct segmented_address addr,
3d9b938e 625 unsigned size, bool write, bool fetch,
52fd8b44
AK		 626 ulong *linear)
627{
618ff15d
AK		 628 struct desc_struct desc;
629 bool usable;
52fd8b44 630 ulong la;
618ff15d 631 u32 lim;
1aa36616 632 u16 sel;
3a78a4f4 633 unsigned cpl;
52fd8b44 634
7b105ca2 635 la = seg_base(ctxt, addr.seg) + addr.ea;
618ff15d 636 switch (ctxt->mode) {
618ff15d
AK		 637 case X86EMUL_MODE_PROT64:
638 if (((signed long)la << 16) >> 16 != la)
639 return emulate_gp(ctxt, 0);
640 break;
641 default:
1aa36616
AK		 642 usable = ctxt->ops->get_segment(ctxt, &sel, &desc, NULL,
643 addr.seg);
618ff15d
AK		 644 if (!usable)
645 goto bad;
58b7825b
GN		 646 /* code segment in protected mode or read-only data segment */
647 if ((((ctxt->mode != X86EMUL_MODE_REAL) && (desc.type & 8))
648 || !(desc.type & 2)) && write)
618ff15d
AK		 649 goto bad;
650 /* unreadable code segment */
3d9b938e 651 if (!fetch && (desc.type & 8) && !(desc.type & 2))
618ff15d
AK		 652 goto bad;
653 lim = desc_limit_scaled(&desc);
654 if ((desc.type & 8) || !(desc.type & 4)) {
655 /* expand-up segment */
656 if (addr.ea > lim || (u32)(addr.ea + size - 1) > lim)
657 goto bad;
658 } else {
fc058680 659 /* expand-down segment */
618ff15d
AK		 660 if (addr.ea <= lim || (u32)(addr.ea + size - 1) <= lim)
661 goto bad;
662 lim = desc.d ? 0xffffffff : 0xffff;
663 if (addr.ea > lim || (u32)(addr.ea + size - 1) > lim)
664 goto bad;
665 }
717746e3 666 cpl = ctxt->ops->cpl(ctxt);
618ff15d
AK		 667 if (!(desc.type & 8)) {
668 /* data segment */
669 if (cpl > desc.dpl)
670 goto bad;
671 } else if ((desc.type & 8) && !(desc.type & 4)) {
672 /* nonconforming code segment */
673 if (cpl != desc.dpl)
674 goto bad;
675 } else if ((desc.type & 8) && (desc.type & 4)) {
676 /* conforming code segment */
677 if (cpl < desc.dpl)
678 goto bad;
679 }
680 break;
681 }
9dac77fa 682 if (fetch ? ctxt->mode != X86EMUL_MODE_PROT64 : ctxt->ad_bytes != 8)
52fd8b44 683 la &= (u32)-1;
1c11b376
AK		 684 if (insn_aligned(ctxt, size) && ((la & (size - 1)) != 0))
685 return emulate_gp(ctxt, 0);
52fd8b44
AK		 686 *linear = la;
687 return X86EMUL_CONTINUE;
618ff15d
AK		 688bad:
689 if (addr.seg == VCPU_SREG_SS)
0afbe2f8 690 return emulate_ss(ctxt, sel);
618ff15d 691 else
0afbe2f8 692 return emulate_gp(ctxt, sel);
52fd8b44
AK		 693}
694
3d9b938e
NE		 695static int linearize(struct x86_emulate_ctxt *ctxt,
696 struct segmented_address addr,
697 unsigned size, bool write,
698 ulong *linear)
699{
700 return __linearize(ctxt, addr, size, write, false, linear);
701}
702
703
3ca3ac4d
AK		 704static int segmented_read_std(struct x86_emulate_ctxt *ctxt,
705 struct segmented_address addr,
706 void *data,
707 unsigned size)
708{
9fa088f4
AK		 709 int rc;
710 ulong linear;
711
83b8795a 712 rc = linearize(ctxt, addr, size, false, &linear);
9fa088f4
AK		 713 if (rc != X86EMUL_CONTINUE)
714 return rc;
0f65dd70 715 return ctxt->ops->read_std(ctxt, linear, data, size, &ctxt->exception);
3ca3ac4d
AK		 716}
717
807941b1
TY		 718/*
719 * Fetch the next byte of the instruction being emulated which is pointed to
720 * by ctxt->_eip, then increment ctxt->_eip.
721 *
722 * Also prefetch the remaining bytes of the instruction without crossing page
723 * boundary if they are not in fetch_cache yet.
724 */
725static int do_insn_fetch_byte(struct x86_emulate_ctxt *ctxt, u8 *dest)
62266869 726{
9dac77fa 727 struct fetch_cache *fc = &ctxt->fetch;
62266869 728 int rc;
2fb53ad8 729 int size, cur_size;
62266869 730
807941b1 731 if (ctxt->_eip == fc->end) {
3d9b938e 732 unsigned long linear;
807941b1
TY		 733 struct segmented_address addr = { .seg = VCPU_SREG_CS,
734 .ea = ctxt->_eip };
2fb53ad8 735 cur_size = fc->end - fc->start;
807941b1
TY		 736 size = min(15UL - cur_size,
737 PAGE_SIZE - offset_in_page(ctxt->_eip));
3d9b938e 738 rc = __linearize(ctxt, addr, size, false, true, &linear);
7d88bb48 739 if (unlikely(rc != X86EMUL_CONTINUE))
3d9b938e 740 return rc;
ef5d75cc
TY		 741 rc = ctxt->ops->fetch(ctxt, linear, fc->data + cur_size,
742 size, &ctxt->exception);
7d88bb48 743 if (unlikely(rc != X86EMUL_CONTINUE))
62266869 744 return rc;
2fb53ad8 745 fc->end += size;
62266869 746 }
807941b1
TY		 747 *dest = fc->data[ctxt->_eip - fc->start];
748 ctxt->_eip++;
3e2815e9 749 return X86EMUL_CONTINUE;
62266869
AK		 750}
751
752static int do_insn_fetch(struct x86_emulate_ctxt *ctxt,
807941b1 753 void *dest, unsigned size)
62266869 754{
3e2815e9 755 int rc;
62266869 756
eb3c79e6 757 /* x86 instructions are limited to 15 bytes. */
7d88bb48 758 if (unlikely(ctxt->_eip + size - ctxt->eip > 15))
eb3c79e6 759 return X86EMUL_UNHANDLEABLE;
62266869 760 while (size--) {
807941b1 761 rc = do_insn_fetch_byte(ctxt, dest++);
3e2815e9 762 if (rc != X86EMUL_CONTINUE)
62266869
AK		 763 return rc;
764 }
3e2815e9 765 return X86EMUL_CONTINUE;
62266869
AK		 766}
767
67cbc90d 768/* Fetch next part of the instruction being emulated. */
e85a1085 769#define insn_fetch(_type, _ctxt) \
67cbc90d 770({ unsigned long _x; \
e85a1085 771 rc = do_insn_fetch(_ctxt, &_x, sizeof(_type)); \
67cbc90d
TY		 772 if (rc != X86EMUL_CONTINUE) \
773 goto done; \
67cbc90d
TY		 774 (_type)_x; \
775})
776
807941b1
TY		 777#define insn_fetch_arr(_arr, _size, _ctxt) \
778({ rc = do_insn_fetch(_ctxt, _arr, (_size)); \
67cbc90d
TY		 779 if (rc != X86EMUL_CONTINUE) \
780 goto done; \
67cbc90d
TY		 781})
782
1e3c5cb0
RR		 783/*
784 * Given the 'reg' portion of a ModRM byte, and a register block, return a
785 * pointer into the block that addresses the relevant register.
786 * @highbyte_regs specifies whether to decode AH,CH,DH,BH.
787 */
dd856efa 788static void *decode_register(struct x86_emulate_ctxt *ctxt, u8 modrm_reg,
aa9ac1a6 789 int byteop)
6aa8b732
AK		 790{
791 void *p;
aa9ac1a6 792 int highbyte_regs = (ctxt->rex_prefix == 0) && byteop;
6aa8b732 793
6aa8b732 794 if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8)
dd856efa
AK		 795 p = (unsigned char *)reg_rmw(ctxt, modrm_reg & 3) + 1;
796 else
797 p = reg_rmw(ctxt, modrm_reg);
6aa8b732
AK		 798 return p;
799}
800
801static int read_descriptor(struct x86_emulate_ctxt *ctxt,
90de84f5 802 struct segmented_address addr,
6aa8b732
AK		 803 u16 *size, unsigned long *address, int op_bytes)
804{
805 int rc;
806
807 if (op_bytes == 2)
808 op_bytes = 3;
809 *address = 0;
3ca3ac4d 810 rc = segmented_read_std(ctxt, addr, size, 2);
1b30eaa8 811 if (rc != X86EMUL_CONTINUE)
6aa8b732 812 return rc;
30b31ab6 813 addr.ea += 2;
3ca3ac4d 814 rc = segmented_read_std(ctxt, addr, address, op_bytes);
6aa8b732
AK		 815 return rc;
816}
817
34b77652
AK		 818FASTOP2(add);
819FASTOP2(or);
820FASTOP2(adc);
821FASTOP2(sbb);
822FASTOP2(and);
823FASTOP2(sub);
824FASTOP2(xor);
825FASTOP2(cmp);
826FASTOP2(test);
827
b9fa409b
AK		 828FASTOP1SRC2(mul, mul_ex);
829FASTOP1SRC2(imul, imul_ex);
b8c0b6ae
AK		 830FASTOP1SRC2EX(div, div_ex);
831FASTOP1SRC2EX(idiv, idiv_ex);
b9fa409b 832
34b77652
AK		 833FASTOP3WCL(shld);
834FASTOP3WCL(shrd);
835
836FASTOP2W(imul);
837
838FASTOP1(not);
839FASTOP1(neg);
840FASTOP1(inc);
841FASTOP1(dec);
842
843FASTOP2CL(rol);
844FASTOP2CL(ror);
845FASTOP2CL(rcl);
846FASTOP2CL(rcr);
847FASTOP2CL(shl);
848FASTOP2CL(shr);
849FASTOP2CL(sar);
850
851FASTOP2W(bsf);
852FASTOP2W(bsr);
853FASTOP2W(bt);
854FASTOP2W(bts);
855FASTOP2W(btr);
856FASTOP2W(btc);
857
e47a5f5f
AK		 858FASTOP2(xadd);
859
9ae9feba 860static u8 test_cc(unsigned int condition, unsigned long flags)
bbe9abbd 861{
9ae9feba
AK		 862 u8 rc;
863 void (*fop)(void) = (void *)em_setcc + 4 * (condition & 0xf);
bbe9abbd 864
9ae9feba 865 flags = (flags & EFLAGS_MASK) | X86_EFLAGS_IF;
3f0c3d0b 866 asm("push %[flags]; popf; call *%[fastop]"
9ae9feba
AK		 867 : "=a"(rc) : [fastop]"r"(fop), [flags]"r"(flags));
868 return rc;
bbe9abbd
NK		 869}
870
91ff3cb4
AK		 871static void fetch_register_operand(struct operand *op)
872{
873 switch (op->bytes) {
874 case 1:
875 op->val = *(u8 *)op->addr.reg;
876 break;
877 case 2:
878 op->val = *(u16 *)op->addr.reg;
879 break;
880 case 4:
881 op->val = *(u32 *)op->addr.reg;
882 break;
883 case 8:
884 op->val = *(u64 *)op->addr.reg;
885 break;
886 }
887}
888
1253791d
AK		 889static void read_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, int reg)
890{
891 ctxt->ops->get_fpu(ctxt);
892 switch (reg) {
89a87c67
MK		 893 case 0: asm("movdqa %%xmm0, %0" : "=m"(*data)); break;
894 case 1: asm("movdqa %%xmm1, %0" : "=m"(*data)); break;
895 case 2: asm("movdqa %%xmm2, %0" : "=m"(*data)); break;
896 case 3: asm("movdqa %%xmm3, %0" : "=m"(*data)); break;
897 case 4: asm("movdqa %%xmm4, %0" : "=m"(*data)); break;
898 case 5: asm("movdqa %%xmm5, %0" : "=m"(*data)); break;
899 case 6: asm("movdqa %%xmm6, %0" : "=m"(*data)); break;
900 case 7: asm("movdqa %%xmm7, %0" : "=m"(*data)); break;
1253791d 901#ifdef CONFIG_X86_64
89a87c67
MK		 902 case 8: asm("movdqa %%xmm8, %0" : "=m"(*data)); break;
903 case 9: asm("movdqa %%xmm9, %0" : "=m"(*data)); break;
904 case 10: asm("movdqa %%xmm10, %0" : "=m"(*data)); break;
905 case 11: asm("movdqa %%xmm11, %0" : "=m"(*data)); break;
906 case 12: asm("movdqa %%xmm12, %0" : "=m"(*data)); break;
907 case 13: asm("movdqa %%xmm13, %0" : "=m"(*data)); break;
908 case 14: asm("movdqa %%xmm14, %0" : "=m"(*data)); break;
909 case 15: asm("movdqa %%xmm15, %0" : "=m"(*data)); break;
1253791d
AK		 910#endif
911 default: BUG();
912 }
913 ctxt->ops->put_fpu(ctxt);
914}
915
916static void write_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data,
917 int reg)
918{
919 ctxt->ops->get_fpu(ctxt);
920 switch (reg) {
89a87c67
MK		 921 case 0: asm("movdqa %0, %%xmm0" : : "m"(*data)); break;
922 case 1: asm("movdqa %0, %%xmm1" : : "m"(*data)); break;
923 case 2: asm("movdqa %0, %%xmm2" : : "m"(*data)); break;
924 case 3: asm("movdqa %0, %%xmm3" : : "m"(*data)); break;
925 case 4: asm("movdqa %0, %%xmm4" : : "m"(*data)); break;
926 case 5: asm("movdqa %0, %%xmm5" : : "m"(*data)); break;
927 case 6: asm("movdqa %0, %%xmm6" : : "m"(*data)); break;
928 case 7: asm("movdqa %0, %%xmm7" : : "m"(*data)); break;
1253791d 929#ifdef CONFIG_X86_64
89a87c67
MK		 930 case 8: asm("movdqa %0, %%xmm8" : : "m"(*data)); break;
931 case 9: asm("movdqa %0, %%xmm9" : : "m"(*data)); break;
932 case 10: asm("movdqa %0, %%xmm10" : : "m"(*data)); break;
933 case 11: asm("movdqa %0, %%xmm11" : : "m"(*data)); break;
934 case 12: asm("movdqa %0, %%xmm12" : : "m"(*data)); break;
935 case 13: asm("movdqa %0, %%xmm13" : : "m"(*data)); break;
936 case 14: asm("movdqa %0, %%xmm14" : : "m"(*data)); break;
937 case 15: asm("movdqa %0, %%xmm15" : : "m"(*data)); break;
1253791d
AK		 938#endif
939 default: BUG();
940 }
941 ctxt->ops->put_fpu(ctxt);
942}
943
cbe2c9d3
AK		 944static void read_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg)
945{
946 ctxt->ops->get_fpu(ctxt);
947 switch (reg) {
948 case 0: asm("movq %%mm0, %0" : "=m"(*data)); break;
949 case 1: asm("movq %%mm1, %0" : "=m"(*data)); break;
950 case 2: asm("movq %%mm2, %0" : "=m"(*data)); break;
951 case 3: asm("movq %%mm3, %0" : "=m"(*data)); break;
952 case 4: asm("movq %%mm4, %0" : "=m"(*data)); break;
953 case 5: asm("movq %%mm5, %0" : "=m"(*data)); break;
954 case 6: asm("movq %%mm6, %0" : "=m"(*data)); break;
955 case 7: asm("movq %%mm7, %0" : "=m"(*data)); break;
956 default: BUG();
957 }
958 ctxt->ops->put_fpu(ctxt);
959}
960
961static void write_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg)
962{
963 ctxt->ops->get_fpu(ctxt);
964 switch (reg) {
965 case 0: asm("movq %0, %%mm0" : : "m"(*data)); break;
966 case 1: asm("movq %0, %%mm1" : : "m"(*data)); break;
967 case 2: asm("movq %0, %%mm2" : : "m"(*data)); break;
968 case 3: asm("movq %0, %%mm3" : : "m"(*data)); break;
969 case 4: asm("movq %0, %%mm4" : : "m"(*data)); break;
970 case 5: asm("movq %0, %%mm5" : : "m"(*data)); break;
971 case 6: asm("movq %0, %%mm6" : : "m"(*data)); break;
972 case 7: asm("movq %0, %%mm7" : : "m"(*data)); break;
973 default: BUG();
974 }
975 ctxt->ops->put_fpu(ctxt);
976}
977
045a282c
GN		 978static int em_fninit(struct x86_emulate_ctxt *ctxt)
979{
980 if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
981 return emulate_nm(ctxt);
982
983 ctxt->ops->get_fpu(ctxt);
984 asm volatile("fninit");
985 ctxt->ops->put_fpu(ctxt);
986 return X86EMUL_CONTINUE;
987}
988
989static int em_fnstcw(struct x86_emulate_ctxt *ctxt)
990{
991 u16 fcw;
992
993 if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
994 return emulate_nm(ctxt);
995
996 ctxt->ops->get_fpu(ctxt);
997 asm volatile("fnstcw %0": "+m"(fcw));
998 ctxt->ops->put_fpu(ctxt);
999
1000 /* force 2 byte destination */
1001 ctxt->dst.bytes = 2;
1002 ctxt->dst.val = fcw;
1003
1004 return X86EMUL_CONTINUE;
1005}
1006
1007static int em_fnstsw(struct x86_emulate_ctxt *ctxt)
1008{
1009 u16 fsw;
1010
1011 if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
1012 return emulate_nm(ctxt);
1013
1014 ctxt->ops->get_fpu(ctxt);
1015 asm volatile("fnstsw %0": "+m"(fsw));
1016 ctxt->ops->put_fpu(ctxt);
1017
1018 /* force 2 byte destination */
1019 ctxt->dst.bytes = 2;
1020 ctxt->dst.val = fsw;
1021
1022 return X86EMUL_CONTINUE;
1023}
1024
1253791d 1025static void decode_register_operand(struct x86_emulate_ctxt *ctxt,
2adb5ad9 1026 struct operand *op)
3c118e24 1027{
9dac77fa 1028 unsigned reg = ctxt->modrm_reg;
33615aa9 1029
9dac77fa
AK		 1030 if (!(ctxt->d & ModRM))
1031 reg = (ctxt->b & 7) | ((ctxt->rex_prefix & 1) << 3);
1253791d 1032
9dac77fa 1033 if (ctxt->d & Sse) {
1253791d
AK		 1034 op->type = OP_XMM;
1035 op->bytes = 16;
1036 op->addr.xmm = reg;
1037 read_sse_reg(ctxt, &op->vec_val, reg);
1038 return;
1039 }
cbe2c9d3
AK		 1040 if (ctxt->d & Mmx) {
1041 reg &= 7;
1042 op->type = OP_MM;
1043 op->bytes = 8;
1044 op->addr.mm = reg;
1045 return;
1046 }
1253791d 1047
3c118e24 1048 op->type = OP_REG;
6d4d85ec
GN		 1049 op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
1050 op->addr.reg = decode_register(ctxt, reg, ctxt->d & ByteOp);
1051
91ff3cb4 1052 fetch_register_operand(op);
3c118e24
AK		 1053 op->orig_val = op->val;
1054}
1055
a6e3407b
AK		 1056static void adjust_modrm_seg(struct x86_emulate_ctxt *ctxt, int base_reg)
1057{
1058 if (base_reg == VCPU_REGS_RSP || base_reg == VCPU_REGS_RBP)
1059 ctxt->modrm_seg = VCPU_SREG_SS;
1060}
1061
1c73ef66 1062static int decode_modrm(struct x86_emulate_ctxt *ctxt,
2dbd0dd7 1063 struct operand *op)
1c73ef66 1064{
1c73ef66 1065 u8 sib;
f5b4edcd 1066 int index_reg = 0, base_reg = 0, scale;
3e2815e9 1067 int rc = X86EMUL_CONTINUE;
2dbd0dd7 1068 ulong modrm_ea = 0;
1c73ef66 1069
9dac77fa
AK		 1070 if (ctxt->rex_prefix) {
1071 ctxt->modrm_reg = (ctxt->rex_prefix & 4) << 1; /* REX.R */
1072 index_reg = (ctxt->rex_prefix & 2) << 2; /* REX.X */
1073 ctxt->modrm_rm = base_reg = (ctxt->rex_prefix & 1) << 3; /* REG.B */
1c73ef66
AK		 1074 }
1075
9dac77fa
AK		 1076 ctxt->modrm_mod |= (ctxt->modrm & 0xc0) >> 6;
1077 ctxt->modrm_reg |= (ctxt->modrm & 0x38) >> 3;
1078 ctxt->modrm_rm |= (ctxt->modrm & 0x07);
1079 ctxt->modrm_seg = VCPU_SREG_DS;
1c73ef66 1080
9b88ae99 1081 if (ctxt->modrm_mod == 3 || (ctxt->d & NoMod)) {
2dbd0dd7 1082 op->type = OP_REG;
9dac77fa 1083 op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
8acb4207 1084 op->addr.reg = decode_register(ctxt, ctxt->modrm_rm,
aa9ac1a6 1085 ctxt->d & ByteOp);
9dac77fa 1086 if (ctxt->d & Sse) {
1253791d
AK		 1087 op->type = OP_XMM;
1088 op->bytes = 16;
9dac77fa
AK		 1089 op->addr.xmm = ctxt->modrm_rm;
1090 read_sse_reg(ctxt, &op->vec_val, ctxt->modrm_rm);
1253791d
AK		 1091 return rc;
1092 }
cbe2c9d3
AK		 1093 if (ctxt->d & Mmx) {
1094 op->type = OP_MM;
1095 op->bytes = 8;
bdc90722 1096 op->addr.mm = ctxt->modrm_rm & 7;
cbe2c9d3
AK		 1097 return rc;
1098 }
2dbd0dd7 1099 fetch_register_operand(op);
1c73ef66
AK		 1100 return rc;
1101 }
1102
2dbd0dd7
AK		 1103 op->type = OP_MEM;
1104
9dac77fa 1105 if (ctxt->ad_bytes == 2) {
dd856efa
AK		 1106 unsigned bx = reg_read(ctxt, VCPU_REGS_RBX);
1107 unsigned bp = reg_read(ctxt, VCPU_REGS_RBP);
1108 unsigned si = reg_read(ctxt, VCPU_REGS_RSI);
1109 unsigned di = reg_read(ctxt, VCPU_REGS_RDI);
1c73ef66
AK		 1110
1111 /* 16-bit ModR/M decode. */
9dac77fa 1112 switch (ctxt->modrm_mod) {
1c73ef66 1113 case 0:
9dac77fa 1114 if (ctxt->modrm_rm == 6)
e85a1085 1115 modrm_ea += insn_fetch(u16, ctxt);
1c73ef66
AK		 1116 break;
1117 case 1:
e85a1085 1118 modrm_ea += insn_fetch(s8, ctxt);
1c73ef66
AK		 1119 break;
1120 case 2:
e85a1085 1121 modrm_ea += insn_fetch(u16, ctxt);
1c73ef66
AK		 1122 break;
1123 }
9dac77fa 1124 switch (ctxt->modrm_rm) {
1c73ef66 1125 case 0:
2dbd0dd7 1126 modrm_ea += bx + si;
1c73ef66
AK		 1127 break;
1128 case 1:
2dbd0dd7 1129 modrm_ea += bx + di;
1c73ef66
AK		 1130 break;
1131 case 2:
2dbd0dd7 1132 modrm_ea += bp + si;
1c73ef66
AK		 1133 break;
1134 case 3:
2dbd0dd7 1135 modrm_ea += bp + di;
1c73ef66
AK		 1136 break;
1137 case 4:
2dbd0dd7 1138 modrm_ea += si;
1c73ef66
AK		 1139 break;
1140 case 5:
2dbd0dd7 1141 modrm_ea += di;
1c73ef66
AK		 1142 break;
1143 case 6:
9dac77fa 1144 if (ctxt->modrm_mod != 0)
2dbd0dd7 1145 modrm_ea += bp;
1c73ef66
AK		 1146 break;
1147 case 7:
2dbd0dd7 1148 modrm_ea += bx;
1c73ef66
AK		 1149 break;
1150 }
9dac77fa
AK		 1151 if (ctxt->modrm_rm == 2 || ctxt->modrm_rm == 3 ||
1152 (ctxt->modrm_rm == 6 && ctxt->modrm_mod != 0))
1153 ctxt->modrm_seg = VCPU_SREG_SS;
2dbd0dd7 1154 modrm_ea = (u16)modrm_ea;
1c73ef66
AK		 1155 } else {
1156 /* 32/64-bit ModR/M decode. */
9dac77fa 1157 if ((ctxt->modrm_rm & 7) == 4) {
e85a1085 1158 sib = insn_fetch(u8, ctxt);
1c73ef66
AK		 1159 index_reg |= (sib >> 3) & 7;
1160 base_reg |= sib & 7;
1161 scale = sib >> 6;
1162
9dac77fa 1163 if ((base_reg & 7) == 5 && ctxt->modrm_mod == 0)
e85a1085 1164 modrm_ea += insn_fetch(s32, ctxt);
a6e3407b 1165 else {
dd856efa 1166 modrm_ea += reg_read(ctxt, base_reg);
a6e3407b
AK		 1167 adjust_modrm_seg(ctxt, base_reg);
1168 }
dc71d0f1 1169 if (index_reg != 4)
dd856efa 1170 modrm_ea += reg_read(ctxt, index_reg) << scale;
9dac77fa 1171 } else if ((ctxt->modrm_rm & 7) == 5 && ctxt->modrm_mod == 0) {
84411d85 1172 if (ctxt->mode == X86EMUL_MODE_PROT64)
9dac77fa 1173 ctxt->rip_relative = 1;
a6e3407b
AK		 1174 } else {
1175 base_reg = ctxt->modrm_rm;
dd856efa 1176 modrm_ea += reg_read(ctxt, base_reg);
a6e3407b
AK		 1177 adjust_modrm_seg(ctxt, base_reg);
1178 }
9dac77fa 1179 switch (ctxt->modrm_mod) {
1c73ef66 1180 case 0:
9dac77fa 1181 if (ctxt->modrm_rm == 5)
e85a1085 1182 modrm_ea += insn_fetch(s32, ctxt);
1c73ef66
AK		 1183 break;
1184 case 1:
e85a1085 1185 modrm_ea += insn_fetch(s8, ctxt);
1c73ef66
AK		 1186 break;
1187 case 2:
e85a1085 1188 modrm_ea += insn_fetch(s32, ctxt);
1c73ef66
AK		 1189 break;
1190 }
1191 }
90de84f5 1192 op->addr.mem.ea = modrm_ea;
1c73ef66
AK		 1193done:
1194 return rc;
1195}
1196
1197static int decode_abs(struct x86_emulate_ctxt *ctxt,
2dbd0dd7 1198 struct operand *op)
1c73ef66 1199{
3e2815e9 1200 int rc = X86EMUL_CONTINUE;
1c73ef66 1201
2dbd0dd7 1202 op->type = OP_MEM;
9dac77fa 1203 switch (ctxt->ad_bytes) {
1c73ef66 1204 case 2:
e85a1085 1205 op->addr.mem.ea = insn_fetch(u16, ctxt);
1c73ef66
AK		 1206 break;
1207 case 4:
e85a1085 1208 op->addr.mem.ea = insn_fetch(u32, ctxt);
1c73ef66
AK		 1209 break;
1210 case 8:
e85a1085 1211 op->addr.mem.ea = insn_fetch(u64, ctxt);
1c73ef66
AK		 1212 break;
1213 }
1214done:
1215 return rc;
1216}
1217
9dac77fa 1218static void fetch_bit_operand(struct x86_emulate_ctxt *ctxt)
35c843c4 1219{
7129eeca 1220 long sv = 0, mask;
35c843c4 1221
9dac77fa 1222 if (ctxt->dst.type == OP_MEM && ctxt->src.type == OP_REG) {
7dec5603 1223 mask = ~((long)ctxt->dst.bytes * 8 - 1);
35c843c4 1224
9dac77fa
AK		 1225 if (ctxt->src.bytes == 2)
1226 sv = (s16)ctxt->src.val & (s16)mask;
1227 else if (ctxt->src.bytes == 4)
1228 sv = (s32)ctxt->src.val & (s32)mask;
7dec5603
NA		 1229 else
1230 sv = (s64)ctxt->src.val & (s64)mask;
35c843c4 1231
9dac77fa 1232 ctxt->dst.addr.mem.ea += (sv >> 3);
35c843c4 1233 }
ba7ff2b7
WY		 1234
1235 /* only subword offset */
9dac77fa 1236 ctxt->src.val &= (ctxt->dst.bytes << 3) - 1;
35c843c4
WY		 1237}
1238
dde7e6d1 1239static int read_emulated(struct x86_emulate_ctxt *ctxt,
dde7e6d1 1240 unsigned long addr, void *dest, unsigned size)
6aa8b732 1241{
dde7e6d1 1242 int rc;
9dac77fa 1243 struct read_cache *mc = &ctxt->mem_read;
6aa8b732 1244
f23b070e
XG		 1245 if (mc->pos < mc->end)
1246 goto read_cached;
6aa8b732 1247
f23b070e
XG		 1248 WARN_ON((mc->end + size) >= sizeof(mc->data));
1249
1250 rc = ctxt->ops->read_emulated(ctxt, addr, mc->data + mc->end, size,
1251 &ctxt->exception);
1252 if (rc != X86EMUL_CONTINUE)
1253 return rc;
1254
1255 mc->end += size;
1256
1257read_cached:
1258 memcpy(dest, mc->data + mc->pos, size);
1259 mc->pos += size;
dde7e6d1
AK		 1260 return X86EMUL_CONTINUE;
1261}
6aa8b732 1262
3ca3ac4d
AK		 1263static int segmented_read(struct x86_emulate_ctxt *ctxt,
1264 struct segmented_address addr,
1265 void *data,
1266 unsigned size)
1267{
9fa088f4
AK		 1268 int rc;
1269 ulong linear;
1270
83b8795a 1271 rc = linearize(ctxt, addr, size, false, &linear);
9fa088f4
AK		 1272 if (rc != X86EMUL_CONTINUE)
1273 return rc;
7b105ca2 1274 return read_emulated(ctxt, linear, data, size);
3ca3ac4d
AK		 1275}
1276
1277static int segmented_write(struct x86_emulate_ctxt *ctxt,
1278 struct segmented_address addr,
1279 const void *data,
1280 unsigned size)
1281{
9fa088f4
AK		 1282 int rc;
1283 ulong linear;
1284
83b8795a 1285 rc = linearize(ctxt, addr, size, true, &linear);
9fa088f4
AK		 1286 if (rc != X86EMUL_CONTINUE)
1287 return rc;
0f65dd70
AK		 1288 return ctxt->ops->write_emulated(ctxt, linear, data, size,
1289 &ctxt->exception);
3ca3ac4d
AK		 1290}
1291
1292static int segmented_cmpxchg(struct x86_emulate_ctxt *ctxt,
1293 struct segmented_address addr,
1294 const void *orig_data, const void *data,
1295 unsigned size)
1296{
9fa088f4
AK		 1297 int rc;
1298 ulong linear;
1299
83b8795a 1300 rc = linearize(ctxt, addr, size, true, &linear);
9fa088f4
AK		 1301 if (rc != X86EMUL_CONTINUE)
1302 return rc;
0f65dd70
AK		 1303 return ctxt->ops->cmpxchg_emulated(ctxt, linear, orig_data, data,
1304 size, &ctxt->exception);
3ca3ac4d
AK		 1305}
1306
dde7e6d1 1307static int pio_in_emulated(struct x86_emulate_ctxt *ctxt,
dde7e6d1
AK		 1308 unsigned int size, unsigned short port,
1309 void *dest)
1310{
9dac77fa 1311 struct read_cache *rc = &ctxt->io_read;
b4c6abfe 1312
dde7e6d1 1313 if (rc->pos == rc->end) { /* refill pio read ahead */
dde7e6d1 1314 unsigned int in_page, n;
9dac77fa 1315 unsigned int count = ctxt->rep_prefix ?
dd856efa 1316 address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) : 1;
dde7e6d1 1317 in_page = (ctxt->eflags & EFLG_DF) ?
dd856efa
AK		 1318 offset_in_page(reg_read(ctxt, VCPU_REGS_RDI)) :
1319 PAGE_SIZE - offset_in_page(reg_read(ctxt, VCPU_REGS_RDI));
dde7e6d1
AK		 1320 n = min(min(in_page, (unsigned int)sizeof(rc->data)) / size,
1321 count);
1322 if (n == 0)
1323 n = 1;
1324 rc->pos = rc->end = 0;
7b105ca2 1325 if (!ctxt->ops->pio_in_emulated(ctxt, size, port, rc->data, n))
dde7e6d1
AK		 1326 return 0;
1327 rc->end = n * size;
6aa8b732
AK		 1328 }
1329
e6e39f04
NA		 1330 if (ctxt->rep_prefix && (ctxt->d & String) &&
1331 !(ctxt->eflags & EFLG_DF)) {
b3356bf0
GN		 1332 ctxt->dst.data = rc->data + rc->pos;
1333 ctxt->dst.type = OP_MEM_STR;
1334 ctxt->dst.count = (rc->end - rc->pos) / size;
1335 rc->pos = rc->end;
1336 } else {
1337 memcpy(dest, rc->data + rc->pos, size);
1338 rc->pos += size;
1339 }
dde7e6d1
AK		 1340 return 1;
1341}
6aa8b732 1342
7f3d35fd
KW		 1343static int read_interrupt_descriptor(struct x86_emulate_ctxt *ctxt,
1344 u16 index, struct desc_struct *desc)
1345{
1346 struct desc_ptr dt;
1347 ulong addr;
1348
1349 ctxt->ops->get_idt(ctxt, &dt);
1350
1351 if (dt.size < index * 8 + 7)
1352 return emulate_gp(ctxt, index << 3 | 0x2);
1353
1354 addr = dt.address + index * 8;
1355 return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc,
1356 &ctxt->exception);
1357}
1358
dde7e6d1 1359static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt,
dde7e6d1
AK		 1360 u16 selector, struct desc_ptr *dt)
1361{
0225fb50 1362 const struct x86_emulate_ops *ops = ctxt->ops;
2eedcac8 1363 u32 base3 = 0;
7b105ca2 1364
dde7e6d1
AK		 1365 if (selector & 1 << 2) {
1366 struct desc_struct desc;
1aa36616
AK		 1367 u16 sel;
1368
dde7e6d1 1369 memset (dt, 0, sizeof *dt);
2eedcac8
NA		 1370 if (!ops->get_segment(ctxt, &sel, &desc, &base3,
1371 VCPU_SREG_LDTR))
dde7e6d1 1372 return;
e09d082c 1373
dde7e6d1 1374 dt->size = desc_limit_scaled(&desc); /* what if limit > 65535? */
2eedcac8 1375 dt->address = get_desc_base(&desc) | ((u64)base3 << 32);
dde7e6d1 1376 } else
4bff1e86 1377 ops->get_gdt(ctxt, dt);
dde7e6d1 1378}
120df890 1379
dde7e6d1
AK		 1380/* allowed just for 8 bytes segments */
1381static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt,
e919464b
AK		 1382 u16 selector, struct desc_struct *desc,
1383 ulong *desc_addr_p)
dde7e6d1
AK		 1384{
1385 struct desc_ptr dt;
1386 u16 index = selector >> 3;
dde7e6d1 1387 ulong addr;
120df890 1388
7b105ca2 1389 get_descriptor_table_ptr(ctxt, selector, &dt);
120df890 1390
35d3d4a1
AK		 1391 if (dt.size < index * 8 + 7)
1392 return emulate_gp(ctxt, selector & 0xfffc);
e09d082c 1393
e919464b 1394 *desc_addr_p = addr = dt.address + index * 8;
7b105ca2
TY		 1395 return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc,
1396 &ctxt->exception);
dde7e6d1 1397}
ef65c889 1398
dde7e6d1
AK		 1399/* allowed just for 8 bytes segments */
1400static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt,
dde7e6d1
AK		 1401 u16 selector, struct desc_struct *desc)
1402{
1403 struct desc_ptr dt;
1404 u16 index = selector >> 3;
dde7e6d1 1405 ulong addr;
6aa8b732 1406
7b105ca2 1407 get_descriptor_table_ptr(ctxt, selector, &dt);
6e3d5dfb 1408
35d3d4a1
AK		 1409 if (dt.size < index * 8 + 7)
1410 return emulate_gp(ctxt, selector & 0xfffc);
6aa8b732 1411
dde7e6d1 1412 addr = dt.address + index * 8;
7b105ca2
TY		 1413 return ctxt->ops->write_std(ctxt, addr, desc, sizeof *desc,
1414 &ctxt->exception);
dde7e6d1 1415}
c7e75a3d 1416
5601d05b 1417/* Does not support long mode */
2356aaeb 1418static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
5045b468 1419 u16 selector, int seg, u8 cpl, bool in_task_switch)
dde7e6d1 1420{
869be99c 1421 struct desc_struct seg_desc, old_desc;
2356aaeb 1422 u8 dpl, rpl;
dde7e6d1
AK		 1423 unsigned err_vec = GP_VECTOR;
1424 u32 err_code = 0;
1425 bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */
e919464b 1426 ulong desc_addr;
dde7e6d1 1427 int ret;
03ebebeb 1428 u16 dummy;
e37a75a1 1429 u32 base3 = 0;
69f55cb1 1430
dde7e6d1 1431 memset(&seg_desc, 0, sizeof seg_desc);
69f55cb1 1432
f8da94e9
KW		 1433 if (ctxt->mode == X86EMUL_MODE_REAL) {
1434 /* set real mode segment descriptor (keep limit etc. for
1435 * unreal mode) */
03ebebeb 1436 ctxt->ops->get_segment(ctxt, &dummy, &seg_desc, NULL, seg);
dde7e6d1 1437 set_desc_base(&seg_desc, selector << 4);
dde7e6d1 1438 goto load;
f8da94e9
KW		 1439 } else if (seg <= VCPU_SREG_GS && ctxt->mode == X86EMUL_MODE_VM86) {
1440 /* VM86 needs a clean new segment descriptor */
1441 set_desc_base(&seg_desc, selector << 4);
1442 set_desc_limit(&seg_desc, 0xffff);
1443 seg_desc.type = 3;
1444 seg_desc.p = 1;
1445 seg_desc.s = 1;
1446 seg_desc.dpl = 3;
1447 goto load;
dde7e6d1
AK		 1448 }
1449
79d5b4c3 1450 rpl = selector & 3;
79d5b4c3
AK		 1451
1452 /* NULL selector is not valid for TR, CS and SS (except for long mode) */
1453 if ((seg == VCPU_SREG_CS
1454 || (seg == VCPU_SREG_SS
1455 && (ctxt->mode != X86EMUL_MODE_PROT64 || rpl != cpl))
1456 || seg == VCPU_SREG_TR)
dde7e6d1
AK		 1457 && null_selector)
1458 goto exception;
1459
1460 /* TR should be in GDT only */
1461 if (seg == VCPU_SREG_TR && (selector & (1 << 2)))
1462 goto exception;
1463
1464 if (null_selector) /* for NULL selector skip all following checks */
1465 goto load;
1466
e919464b 1467 ret = read_segment_descriptor(ctxt, selector, &seg_desc, &desc_addr);
dde7e6d1
AK		 1468 if (ret != X86EMUL_CONTINUE)
1469 return ret;
1470
1471 err_code = selector & 0xfffc;
1472 err_vec = GP_VECTOR;
1473
fc058680 1474 /* can't load system descriptor into segment selector */
dde7e6d1
AK		 1475 if (seg <= VCPU_SREG_GS && !seg_desc.s)
1476 goto exception;
1477
1478 if (!seg_desc.p) {
1479 err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR;
1480 goto exception;
1481 }
1482
dde7e6d1 1483 dpl = seg_desc.dpl;
dde7e6d1
AK		 1484
1485 switch (seg) {
1486 case VCPU_SREG_SS:
1487 /*
1488 * segment is not a writable data segment or segment
1489 * selector's RPL != CPL or segment selector's RPL != CPL
1490 */
1491 if (rpl != cpl || (seg_desc.type & 0xa) != 0x2 || dpl != cpl)
1492 goto exception;
6aa8b732 1493 break;
dde7e6d1 1494 case VCPU_SREG_CS:
5045b468
PB		 1495 if (in_task_switch && rpl != dpl)
1496 goto exception;
1497
dde7e6d1
AK		 1498 if (!(seg_desc.type & 8))
1499 goto exception;
1500
1501 if (seg_desc.type & 4) {
1502 /* conforming */
1503 if (dpl > cpl)
1504 goto exception;
1505 } else {
1506 /* nonconforming */
1507 if (rpl > cpl || dpl != cpl)
1508 goto exception;
1509 }
1510 /* CS(RPL) <- CPL */
1511 selector = (selector & 0xfffc) | cpl;
6aa8b732 1512 break;
dde7e6d1
AK		 1513 case VCPU_SREG_TR:
1514 if (seg_desc.s || (seg_desc.type != 1 && seg_desc.type != 9))
1515 goto exception;
869be99c
AK		 1516 old_desc = seg_desc;
1517 seg_desc.type |= 2; /* busy */
1518 ret = ctxt->ops->cmpxchg_emulated(ctxt, desc_addr, &old_desc, &seg_desc,
1519 sizeof(seg_desc), &ctxt->exception);
1520 if (ret != X86EMUL_CONTINUE)
1521 return ret;
dde7e6d1
AK		 1522 break;
1523 case VCPU_SREG_LDTR:
1524 if (seg_desc.s || seg_desc.type != 2)
1525 goto exception;
1526 break;
1527 default: /* DS, ES, FS, or GS */
4e62417b 1528 /*
dde7e6d1
AK		 1529 * segment is not a data or readable code segment or
1530 * ((segment is a data or nonconforming code segment)
1531 * and (both RPL and CPL > DPL))
4e62417b 1532 */
dde7e6d1
AK		 1533 if ((seg_desc.type & 0xa) == 0x8 ||
1534 (((seg_desc.type & 0xc) != 0xc) &&
1535 (rpl > dpl && cpl > dpl)))
1536 goto exception;
6aa8b732 1537 break;
dde7e6d1
AK		 1538 }
1539
1540 if (seg_desc.s) {
1541 /* mark segment as accessed */
1542 seg_desc.type |= 1;
7b105ca2 1543 ret = write_segment_descriptor(ctxt, selector, &seg_desc);
dde7e6d1
AK		 1544 if (ret != X86EMUL_CONTINUE)
1545 return ret;
e37a75a1
NA		 1546 } else if (ctxt->mode == X86EMUL_MODE_PROT64) {
1547 ret = ctxt->ops->read_std(ctxt, desc_addr+8, &base3,
1548 sizeof(base3), &ctxt->exception);
1549 if (ret != X86EMUL_CONTINUE)
1550 return ret;
dde7e6d1
AK		 1551 }
1552load:
e37a75a1 1553 ctxt->ops->set_segment(ctxt, selector, &seg_desc, base3, seg);
dde7e6d1
AK		 1554 return X86EMUL_CONTINUE;
1555exception:
1556 emulate_exception(ctxt, err_vec, err_code, true);
1557 return X86EMUL_PROPAGATE_FAULT;
1558}
1559
2356aaeb
PB		 1560static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
1561 u16 selector, int seg)
1562{
1563 u8 cpl = ctxt->ops->cpl(ctxt);
5045b468 1564 return __load_segment_descriptor(ctxt, selector, seg, cpl, false);
2356aaeb
PB		 1565}
1566
31be40b3
WY		 1567static void write_register_operand(struct operand *op)
1568{
1569 /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */
1570 switch (op->bytes) {
1571 case 1:
1572 *(u8 *)op->addr.reg = (u8)op->val;
1573 break;
1574 case 2:
1575 *(u16 *)op->addr.reg = (u16)op->val;
1576 break;
1577 case 4:
1578 *op->addr.reg = (u32)op->val;
1579 break; /* 64b: zero-extend */
1580 case 8:
1581 *op->addr.reg = op->val;
1582 break;
1583 }
1584}
1585
fb32b1ed 1586static int writeback(struct x86_emulate_ctxt *ctxt, struct operand *op)
dde7e6d1
AK		 1587{
1588 int rc;
dde7e6d1 1589
fb32b1ed 1590 switch (op->type) {
dde7e6d1 1591 case OP_REG:
fb32b1ed 1592 write_register_operand(op);
6aa8b732 1593 break;
dde7e6d1 1594 case OP_MEM:
9dac77fa 1595 if (ctxt->lock_prefix)
3ca3ac4d 1596 rc = segmented_cmpxchg(ctxt,
fb32b1ed
AK		 1597 op->addr.mem,
1598 &op->orig_val,
1599 &op->val,
1600 op->bytes);
341de7e3 1601 else
3ca3ac4d 1602 rc = segmented_write(ctxt,
fb32b1ed
AK		 1603 op->addr.mem,
1604 &op->val,
1605 op->bytes);
dde7e6d1
AK		 1606 if (rc != X86EMUL_CONTINUE)
1607 return rc;
a682e354 1608 break;
b3356bf0
GN		 1609 case OP_MEM_STR:
1610 rc = segmented_write(ctxt,
fb32b1ed
AK		 1611 op->addr.mem,
1612 op->data,
1613 op->bytes * op->count);
b3356bf0
GN		 1614 if (rc != X86EMUL_CONTINUE)
1615 return rc;
1616 break;
1253791d 1617 case OP_XMM:
fb32b1ed 1618 write_sse_reg(ctxt, &op->vec_val, op->addr.xmm);
1253791d 1619 break;
cbe2c9d3 1620 case OP_MM:
fb32b1ed 1621 write_mmx_reg(ctxt, &op->mm_val, op->addr.mm);
cbe2c9d3 1622 break;
dde7e6d1
AK		 1623 case OP_NONE:
1624 /* no writeback */
414e6277 1625 break;
dde7e6d1 1626 default:
414e6277 1627 break;
6aa8b732 1628 }
dde7e6d1
AK		 1629 return X86EMUL_CONTINUE;
1630}
6aa8b732 1631
51ddff50 1632static int push(struct x86_emulate_ctxt *ctxt, void *data, int bytes)
dde7e6d1 1633{
4179bb02 1634 struct segmented_address addr;
0dc8d10f 1635
5ad105e5 1636 rsp_increment(ctxt, -bytes);
dd856efa 1637 addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt);
4179bb02
TY		 1638 addr.seg = VCPU_SREG_SS;
1639
51ddff50
AK		 1640 return segmented_write(ctxt, addr, data, bytes);
1641}
1642
1643static int em_push(struct x86_emulate_ctxt *ctxt)
1644{
4179bb02 1645 /* Disable writeback. */
9dac77fa 1646 ctxt->dst.type = OP_NONE;
51ddff50 1647 return push(ctxt, &ctxt->src.val, ctxt->op_bytes);
dde7e6d1 1648}
69f55cb1 1649
dde7e6d1 1650static int emulate_pop(struct x86_emulate_ctxt *ctxt,
dde7e6d1
AK		 1651 void *dest, int len)
1652{
dde7e6d1 1653 int rc;
90de84f5 1654 struct segmented_address addr;
8b4caf66 1655
dd856efa 1656 addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt);
90de84f5 1657 addr.seg = VCPU_SREG_SS;
3ca3ac4d 1658 rc = segmented_read(ctxt, addr, dest, len);
dde7e6d1
AK		 1659 if (rc != X86EMUL_CONTINUE)
1660 return rc;
1661
5ad105e5 1662 rsp_increment(ctxt, len);
dde7e6d1 1663 return rc;
8b4caf66
LV		 1664}
1665
c54fe504
TY		 1666static int em_pop(struct x86_emulate_ctxt *ctxt)
1667{
9dac77fa 1668 return emulate_pop(ctxt, &ctxt->dst.val, ctxt->op_bytes);
c54fe504
TY		 1669}
1670
dde7e6d1 1671static int emulate_popf(struct x86_emulate_ctxt *ctxt,
7b105ca2 1672 void *dest, int len)
9de41573
GN		 1673{
1674 int rc;
dde7e6d1
AK		 1675 unsigned long val, change_mask;
1676 int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
7b105ca2 1677 int cpl = ctxt->ops->cpl(ctxt);
9de41573 1678
3b9be3bf 1679 rc = emulate_pop(ctxt, &val, len);
dde7e6d1
AK		 1680 if (rc != X86EMUL_CONTINUE)
1681 return rc;
9de41573 1682
dde7e6d1
AK		 1683 change_mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_OF
1684 | EFLG_TF | EFLG_DF | EFLG_NT | EFLG_RF | EFLG_AC | EFLG_ID;
9de41573 1685
dde7e6d1
AK		 1686 switch(ctxt->mode) {
1687 case X86EMUL_MODE_PROT64:
1688 case X86EMUL_MODE_PROT32:
1689 case X86EMUL_MODE_PROT16:
1690 if (cpl == 0)
1691 change_mask |= EFLG_IOPL;
1692 if (cpl <= iopl)
1693 change_mask |= EFLG_IF;
1694 break;
1695 case X86EMUL_MODE_VM86:
35d3d4a1
AK		 1696 if (iopl < 3)
1697 return emulate_gp(ctxt, 0);
dde7e6d1
AK		 1698 change_mask |= EFLG_IF;
1699 break;
1700 default: /* real mode */
1701 change_mask |= (EFLG_IOPL | EFLG_IF);
1702 break;
9de41573 1703 }
dde7e6d1
AK		 1704
1705 *(unsigned long *)dest =
1706 (ctxt->eflags & ~change_mask) | (val & change_mask);
1707
1708 return rc;
9de41573
GN		 1709}
1710
62aaa2f0
TY		 1711static int em_popf(struct x86_emulate_ctxt *ctxt)
1712{
9dac77fa
AK		 1713 ctxt->dst.type = OP_REG;
1714 ctxt->dst.addr.reg = &ctxt->eflags;
1715 ctxt->dst.bytes = ctxt->op_bytes;
1716 return emulate_popf(ctxt, &ctxt->dst.val, ctxt->op_bytes);
62aaa2f0
TY		 1717}
1718
612e89f0
AK		 1719static int em_enter(struct x86_emulate_ctxt *ctxt)
1720{
1721 int rc;
1722 unsigned frame_size = ctxt->src.val;
1723 unsigned nesting_level = ctxt->src2.val & 31;
dd856efa 1724 ulong rbp;
612e89f0
AK		 1725
1726 if (nesting_level)
1727 return X86EMUL_UNHANDLEABLE;
1728
dd856efa
AK		 1729 rbp = reg_read(ctxt, VCPU_REGS_RBP);
1730 rc = push(ctxt, &rbp, stack_size(ctxt));
612e89f0
AK		 1731 if (rc != X86EMUL_CONTINUE)
1732 return rc;
dd856efa 1733 assign_masked(reg_rmw(ctxt, VCPU_REGS_RBP), reg_read(ctxt, VCPU_REGS_RSP),
612e89f0 1734 stack_mask(ctxt));
dd856efa
AK		 1735 assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP),
1736 reg_read(ctxt, VCPU_REGS_RSP) - frame_size,
612e89f0
AK		 1737 stack_mask(ctxt));
1738 return X86EMUL_CONTINUE;
1739}
1740
f47cfa31
AK		 1741static int em_leave(struct x86_emulate_ctxt *ctxt)
1742{
dd856efa 1743 assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), reg_read(ctxt, VCPU_REGS_RBP),
f47cfa31 1744 stack_mask(ctxt));
dd856efa 1745 return emulate_pop(ctxt, reg_rmw(ctxt, VCPU_REGS_RBP), ctxt->op_bytes);
f47cfa31
AK		 1746}
1747
1cd196ea 1748static int em_push_sreg(struct x86_emulate_ctxt *ctxt)
7b262e90 1749{
1cd196ea
AK		 1750 int seg = ctxt->src2.val;
1751
9dac77fa 1752 ctxt->src.val = get_segment_selector(ctxt, seg);
7b262e90 1753
4487b3b4 1754 return em_push(ctxt);
7b262e90
GN		 1755}
1756
1cd196ea 1757static int em_pop_sreg(struct x86_emulate_ctxt *ctxt)
38ba30ba 1758{
1cd196ea 1759 int seg = ctxt->src2.val;
dde7e6d1
AK		 1760 unsigned long selector;
1761 int rc;
38ba30ba 1762
9dac77fa 1763 rc = emulate_pop(ctxt, &selector, ctxt->op_bytes);
dde7e6d1
AK		 1764 if (rc != X86EMUL_CONTINUE)
1765 return rc;
1766
a5457e7b
PB		 1767 if (ctxt->modrm_reg == VCPU_SREG_SS)
1768 ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS;
1769
7b105ca2 1770 rc = load_segment_descriptor(ctxt, (u16)selector, seg);
dde7e6d1 1771 return rc;
38ba30ba
GN		 1772}
1773
b96a7fad 1774static int em_pusha(struct x86_emulate_ctxt *ctxt)
38ba30ba 1775{
dd856efa 1776 unsigned long old_esp = reg_read(ctxt, VCPU_REGS_RSP);
dde7e6d1
AK		 1777 int rc = X86EMUL_CONTINUE;
1778 int reg = VCPU_REGS_RAX;
38ba30ba 1779
dde7e6d1
AK		 1780 while (reg <= VCPU_REGS_RDI) {
1781 (reg == VCPU_REGS_RSP) ?
dd856efa 1782 (ctxt->src.val = old_esp) : (ctxt->src.val = reg_read(ctxt, reg));
38ba30ba 1783
4487b3b4 1784 rc = em_push(ctxt);
dde7e6d1
AK		 1785 if (rc != X86EMUL_CONTINUE)
1786 return rc;
38ba30ba 1787
dde7e6d1 1788 ++reg;
38ba30ba 1789 }
38ba30ba 1790
dde7e6d1 1791 return rc;
38ba30ba
GN		 1792}
1793
62aaa2f0
TY		 1794static int em_pushf(struct x86_emulate_ctxt *ctxt)
1795{
9dac77fa 1796 ctxt->src.val = (unsigned long)ctxt->eflags;
62aaa2f0
TY		 1797 return em_push(ctxt);
1798}
1799
b96a7fad 1800static int em_popa(struct x86_emulate_ctxt *ctxt)
38ba30ba 1801{
dde7e6d1
AK		 1802 int rc = X86EMUL_CONTINUE;
1803 int reg = VCPU_REGS_RDI;
38ba30ba 1804
dde7e6d1
AK		 1805 while (reg >= VCPU_REGS_RAX) {
1806 if (reg == VCPU_REGS_RSP) {
5ad105e5 1807 rsp_increment(ctxt, ctxt->op_bytes);
dde7e6d1
AK		 1808 --reg;
1809 }
38ba30ba 1810
dd856efa 1811 rc = emulate_pop(ctxt, reg_rmw(ctxt, reg), ctxt->op_bytes);
dde7e6d1
AK		 1812 if (rc != X86EMUL_CONTINUE)
1813 break;
1814 --reg;
38ba30ba 1815 }
dde7e6d1 1816 return rc;
38ba30ba
GN		 1817}
1818
dd856efa 1819static int __emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq)
6e154e56 1820{
0225fb50 1821 const struct x86_emulate_ops *ops = ctxt->ops;
5c56e1cf 1822 int rc;
6e154e56
MG		 1823 struct desc_ptr dt;
1824 gva_t cs_addr;
1825 gva_t eip_addr;
1826 u16 cs, eip;
6e154e56
MG		 1827
1828 /* TODO: Add limit checks */
9dac77fa 1829 ctxt->src.val = ctxt->eflags;
4487b3b4 1830 rc = em_push(ctxt);
5c56e1cf
AK		 1831 if (rc != X86EMUL_CONTINUE)
1832 return rc;
6e154e56
MG		 1833
1834 ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC);
1835
9dac77fa 1836 ctxt->src.val = get_segment_selector(ctxt, VCPU_SREG_CS);
4487b3b4 1837 rc = em_push(ctxt);
5c56e1cf
AK		 1838 if (rc != X86EMUL_CONTINUE)
1839 return rc;
6e154e56 1840
9dac77fa 1841 ctxt->src.val = ctxt->_eip;
4487b3b4 1842 rc = em_push(ctxt);
5c56e1cf
AK		 1843 if (rc != X86EMUL_CONTINUE)
1844 return rc;
1845
4bff1e86 1846 ops->get_idt(ctxt, &dt);
6e154e56
MG		 1847
1848 eip_addr = dt.address + (irq << 2);
1849 cs_addr = dt.address + (irq << 2) + 2;
1850
0f65dd70 1851 rc = ops->read_std(ctxt, cs_addr, &cs, 2, &ctxt->exception);
6e154e56
MG		 1852 if (rc != X86EMUL_CONTINUE)
1853 return rc;
1854
0f65dd70 1855 rc = ops->read_std(ctxt, eip_addr, &eip, 2, &ctxt->exception);
6e154e56
MG		 1856 if (rc != X86EMUL_CONTINUE)
1857 return rc;
1858
7b105ca2 1859 rc = load_segment_descriptor(ctxt, cs, VCPU_SREG_CS);
6e154e56
MG		 1860 if (rc != X86EMUL_CONTINUE)
1861 return rc;
1862
9dac77fa 1863 ctxt->_eip = eip;
6e154e56
MG		 1864
1865 return rc;
1866}
1867
dd856efa
AK		 1868int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq)
1869{
1870 int rc;
1871
1872 invalidate_registers(ctxt);
1873 rc = __emulate_int_real(ctxt, irq);
1874 if (rc == X86EMUL_CONTINUE)
1875 writeback_registers(ctxt);
1876 return rc;
1877}
1878
7b105ca2 1879static int emulate_int(struct x86_emulate_ctxt *ctxt, int irq)
6e154e56
MG		 1880{
1881 switch(ctxt->mode) {
1882 case X86EMUL_MODE_REAL:
dd856efa 1883 return __emulate_int_real(ctxt, irq);
6e154e56
MG		 1884 case X86EMUL_MODE_VM86:
1885 case X86EMUL_MODE_PROT16:
1886 case X86EMUL_MODE_PROT32:
1887 case X86EMUL_MODE_PROT64:
1888 default:
1889 /* Protected mode interrupts unimplemented yet */
1890 return X86EMUL_UNHANDLEABLE;
1891 }
1892}
1893
7b105ca2 1894static int emulate_iret_real(struct x86_emulate_ctxt *ctxt)
38ba30ba 1895{
dde7e6d1
AK		 1896 int rc = X86EMUL_CONTINUE;
1897 unsigned long temp_eip = 0;
1898 unsigned long temp_eflags = 0;
1899 unsigned long cs = 0;
1900 unsigned long mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_TF |
1901 EFLG_IF | EFLG_DF | EFLG_OF | EFLG_IOPL | EFLG_NT | EFLG_RF |
1902 EFLG_AC | EFLG_ID | (1 << 1); /* Last one is the reserved bit */
1903 unsigned long vm86_mask = EFLG_VM | EFLG_VIF | EFLG_VIP;
38ba30ba 1904
dde7e6d1 1905 /* TODO: Add stack limit check */
38ba30ba 1906
9dac77fa 1907 rc = emulate_pop(ctxt, &temp_eip, ctxt->op_bytes);
38ba30ba 1908
dde7e6d1
AK		 1909 if (rc != X86EMUL_CONTINUE)
1910 return rc;
38ba30ba 1911
35d3d4a1
AK		 1912 if (temp_eip & ~0xffff)
1913 return emulate_gp(ctxt, 0);
38ba30ba 1914
9dac77fa 1915 rc = emulate_pop(ctxt, &cs, ctxt->op_bytes);
38ba30ba 1916
dde7e6d1
AK		 1917 if (rc != X86EMUL_CONTINUE)
1918 return rc;
38ba30ba 1919
9dac77fa 1920 rc = emulate_pop(ctxt, &temp_eflags, ctxt->op_bytes);
38ba30ba 1921
dde7e6d1
AK		 1922 if (rc != X86EMUL_CONTINUE)
1923 return rc;
38ba30ba 1924
7b105ca2 1925 rc = load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS);
38ba30ba 1926
dde7e6d1
AK		 1927 if (rc != X86EMUL_CONTINUE)
1928 return rc;
38ba30ba 1929
9dac77fa 1930 ctxt->_eip = temp_eip;
38ba30ba 1931
38ba30ba 1932
9dac77fa 1933 if (ctxt->op_bytes == 4)
dde7e6d1 1934 ctxt->eflags = ((temp_eflags & mask) | (ctxt->eflags & vm86_mask));
9dac77fa 1935 else if (ctxt->op_bytes == 2) {
dde7e6d1
AK		 1936 ctxt->eflags &= ~0xffff;
1937 ctxt->eflags |= temp_eflags;
38ba30ba 1938 }
dde7e6d1
AK		 1939
1940 ctxt->eflags &= ~EFLG_RESERVED_ZEROS_MASK; /* Clear reserved zeros */
1941 ctxt->eflags |= EFLG_RESERVED_ONE_MASK;
1942
1943 return rc;
38ba30ba
GN		 1944}
1945
e01991e7 1946static int em_iret(struct x86_emulate_ctxt *ctxt)
c37eda13 1947{
dde7e6d1
AK		 1948 switch(ctxt->mode) {
1949 case X86EMUL_MODE_REAL:
7b105ca2 1950 return emulate_iret_real(ctxt);
dde7e6d1
AK		 1951 case X86EMUL_MODE_VM86:
1952 case X86EMUL_MODE_PROT16:
1953 case X86EMUL_MODE_PROT32:
1954 case X86EMUL_MODE_PROT64:
c37eda13 1955 default:
dde7e6d1
AK		 1956 /* iret from protected mode unimplemented yet */
1957 return X86EMUL_UNHANDLEABLE;
c37eda13 1958 }
c37eda13
WY		 1959}
1960
d2f62766
TY		 1961static int em_jmp_far(struct x86_emulate_ctxt *ctxt)
1962{
d2f62766
TY		 1963 int rc;
1964 unsigned short sel;
1965
9dac77fa 1966 memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);
d2f62766 1967
7b105ca2 1968 rc = load_segment_descriptor(ctxt, sel, VCPU_SREG_CS);
d2f62766
TY		 1969 if (rc != X86EMUL_CONTINUE)
1970 return rc;
1971
9dac77fa
AK		 1972 ctxt->_eip = 0;
1973 memcpy(&ctxt->_eip, ctxt->src.valptr, ctxt->op_bytes);
d2f62766
TY		 1974 return X86EMUL_CONTINUE;
1975}
1976
51187683 1977static int em_grp45(struct x86_emulate_ctxt *ctxt)
8cdbd2c9 1978{
4179bb02 1979 int rc = X86EMUL_CONTINUE;
8cdbd2c9 1980
9dac77fa 1981 switch (ctxt->modrm_reg) {
d19292e4
MG		 1982 case 2: /* call near abs */ {
1983 long int old_eip;
9dac77fa
AK		 1984 old_eip = ctxt->_eip;
1985 ctxt->_eip = ctxt->src.val;
1986 ctxt->src.val = old_eip;
4487b3b4 1987 rc = em_push(ctxt);
d19292e4
MG		 1988 break;
1989 }
8cdbd2c9 1990 case 4: /* jmp abs */
9dac77fa 1991 ctxt->_eip = ctxt->src.val;
8cdbd2c9 1992 break;
d2f62766
TY		 1993 case 5: /* jmp far */
1994 rc = em_jmp_far(ctxt);
1995 break;
8cdbd2c9 1996 case 6: /* push */
4487b3b4 1997 rc = em_push(ctxt);
8cdbd2c9 1998 break;
8cdbd2c9 1999 }
4179bb02 2000 return rc;
8cdbd2c9
LV		 2001}
2002
e0dac408 2003static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt)
8cdbd2c9 2004{
9dac77fa 2005 u64 old = ctxt->dst.orig_val64;
8cdbd2c9 2006
aaa05f24
NA		 2007 if (ctxt->dst.bytes == 16)
2008 return X86EMUL_UNHANDLEABLE;
2009
dd856efa
AK		 2010 if (((u32) (old >> 0) != (u32) reg_read(ctxt, VCPU_REGS_RAX)) ||
2011 ((u32) (old >> 32) != (u32) reg_read(ctxt, VCPU_REGS_RDX))) {
2012 *reg_write(ctxt, VCPU_REGS_RAX) = (u32) (old >> 0);
2013 *reg_write(ctxt, VCPU_REGS_RDX) = (u32) (old >> 32);
05f086f8 2014 ctxt->eflags &= ~EFLG_ZF;
8cdbd2c9 2015 } else {
dd856efa
AK		 2016 ctxt->dst.val64 = ((u64)reg_read(ctxt, VCPU_REGS_RCX) << 32) |
2017 (u32) reg_read(ctxt, VCPU_REGS_RBX);
8cdbd2c9 2018
05f086f8 2019 ctxt->eflags |= EFLG_ZF;
8cdbd2c9 2020 }
1b30eaa8 2021 return X86EMUL_CONTINUE;
8cdbd2c9
LV		 2022}
2023
ebda02c2
TY		 2024static int em_ret(struct x86_emulate_ctxt *ctxt)
2025{
9dac77fa
AK		 2026 ctxt->dst.type = OP_REG;
2027 ctxt->dst.addr.reg = &ctxt->_eip;
2028 ctxt->dst.bytes = ctxt->op_bytes;
ebda02c2
TY		 2029 return em_pop(ctxt);
2030}
2031
e01991e7 2032static int em_ret_far(struct x86_emulate_ctxt *ctxt)
a77ab5ea 2033{
a77ab5ea
AK		 2034 int rc;
2035 unsigned long cs;
2036
9dac77fa 2037 rc = emulate_pop(ctxt, &ctxt->_eip, ctxt->op_bytes);
1b30eaa8 2038 if (rc != X86EMUL_CONTINUE)
a77ab5ea 2039 return rc;
9dac77fa
AK		 2040 if (ctxt->op_bytes == 4)
2041 ctxt->_eip = (u32)ctxt->_eip;
2042 rc = emulate_pop(ctxt, &cs, ctxt->op_bytes);
1b30eaa8 2043 if (rc != X86EMUL_CONTINUE)
a77ab5ea 2044 return rc;
7b105ca2 2045 rc = load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS);
a77ab5ea
AK		 2046 return rc;
2047}
2048
3261107e
BR		 2049static int em_ret_far_imm(struct x86_emulate_ctxt *ctxt)
2050{
2051 int rc;
2052
2053 rc = em_ret_far(ctxt);
2054 if (rc != X86EMUL_CONTINUE)
2055 return rc;
2056 rsp_increment(ctxt, ctxt->src.val);
2057 return X86EMUL_CONTINUE;
2058}
2059
e940b5c2
TY		 2060static int em_cmpxchg(struct x86_emulate_ctxt *ctxt)
2061{
2062 /* Save real source value, then compare EAX against destination. */
37c564f2
NA		 2063 ctxt->dst.orig_val = ctxt->dst.val;
2064 ctxt->dst.val = reg_read(ctxt, VCPU_REGS_RAX);
e940b5c2 2065 ctxt->src.orig_val = ctxt->src.val;
37c564f2 2066 ctxt->src.val = ctxt->dst.orig_val;
158de57f 2067 fastop(ctxt, em_cmp);
e940b5c2
TY		 2068
2069 if (ctxt->eflags & EFLG_ZF) {
2070 /* Success: write back to memory. */
2071 ctxt->dst.val = ctxt->src.orig_val;
2072 } else {
2073 /* Failure: write the value we saw to EAX. */
2074 ctxt->dst.type = OP_REG;
dd856efa 2075 ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX);
37c564f2 2076 ctxt->dst.val = ctxt->dst.orig_val;
e940b5c2
TY		 2077 }
2078 return X86EMUL_CONTINUE;
2079}
2080
d4b4325f 2081static int em_lseg(struct x86_emulate_ctxt *ctxt)
09b5f4d3 2082{
d4b4325f 2083 int seg = ctxt->src2.val;
09b5f4d3
WY		 2084 unsigned short sel;
2085 int rc;
2086
9dac77fa 2087 memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);
09b5f4d3 2088
7b105ca2 2089 rc = load_segment_descriptor(ctxt, sel, seg);
09b5f4d3
WY		 2090 if (rc != X86EMUL_CONTINUE)
2091 return rc;
2092
9dac77fa 2093 ctxt->dst.val = ctxt->src.val;
09b5f4d3
WY		 2094 return rc;
2095}
2096
7b105ca2 2097static void
e66bb2cc 2098setup_syscalls_segments(struct x86_emulate_ctxt *ctxt,
7b105ca2 2099 struct desc_struct *cs, struct desc_struct *ss)
e66bb2cc 2100{
e66bb2cc 2101 cs->l = 0; /* will be adjusted later */
79168fd1 2102 set_desc_base(cs, 0); /* flat segment */
e66bb2cc 2103 cs->g = 1; /* 4kb granularity */
79168fd1 2104 set_desc_limit(cs, 0xfffff); /* 4GB limit */
e66bb2cc
AP		 2105 cs->type = 0x0b; /* Read, Execute, Accessed */
2106 cs->s = 1;
2107 cs->dpl = 0; /* will be adjusted later */
79168fd1
GN		 2108 cs->p = 1;
2109 cs->d = 1;
99245b50 2110 cs->avl = 0;
e66bb2cc 2111
79168fd1
GN		 2112 set_desc_base(ss, 0); /* flat segment */
2113 set_desc_limit(ss, 0xfffff); /* 4GB limit */
e66bb2cc
AP		 2114 ss->g = 1; /* 4kb granularity */
2115 ss->s = 1;
2116 ss->type = 0x03; /* Read/Write, Accessed */
79168fd1 2117 ss->d = 1; /* 32bit stack segment */
e66bb2cc 2118 ss->dpl = 0;
79168fd1 2119 ss->p = 1;
99245b50
GN		 2120 ss->l = 0;
2121 ss->avl = 0;
e66bb2cc
AP		 2122}
2123
1a18a69b
AK		 2124static bool vendor_intel(struct x86_emulate_ctxt *ctxt)
2125{
2126 u32 eax, ebx, ecx, edx;
2127
2128 eax = ecx = 0;
0017f93a
AK		 2129 ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
2130 return ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx
1a18a69b
AK		 2131 && ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx
2132 && edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx;
2133}
2134
c2226fc9
SB		 2135static bool em_syscall_is_enabled(struct x86_emulate_ctxt *ctxt)
2136{
0225fb50 2137 const struct x86_emulate_ops *ops = ctxt->ops;
c2226fc9
SB		 2138 u32 eax, ebx, ecx, edx;
2139
2140 /*
2141 * syscall should always be enabled in longmode - so only become
2142 * vendor specific (cpuid) if other modes are active...
2143 */
2144 if (ctxt->mode == X86EMUL_MODE_PROT64)
2145 return true;
2146
2147 eax = 0x00000000;
2148 ecx = 0x00000000;
0017f93a
AK		 2149 ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
2150 /*
2151 * Intel ("GenuineIntel")
2152 * remark: Intel CPUs only support "syscall" in 64bit
2153 * longmode. Also an 64bit guest with a
2154 * 32bit compat-app running will #UD !! While this
2155 * behaviour can be fixed (by emulating) into AMD
2156 * response - CPUs of AMD can't behave like Intel.
2157 */
2158 if (ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx &&
2159 ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx &&
2160 edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx)
2161 return false;
2162
2163 /* AMD ("AuthenticAMD") */
2164 if (ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx &&
2165 ecx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ecx &&
2166 edx == X86EMUL_CPUID_VENDOR_AuthenticAMD_edx)
2167 return true;
2168
2169 /* AMD ("AMDisbetter!") */
2170 if (ebx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ebx &&
2171 ecx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ecx &&
2172 edx == X86EMUL_CPUID_VENDOR_AMDisbetterI_edx)
2173 return true;
c2226fc9
SB		 2174
2175 /* default: (not Intel, not AMD), apply Intel's stricter rules... */
2176 return false;
2177}
2178
e01991e7 2179static int em_syscall(struct x86_emulate_ctxt *ctxt)
e66bb2cc 2180{
0225fb50 2181 const struct x86_emulate_ops *ops = ctxt->ops;
79168fd1 2182 struct desc_struct cs, ss;
e66bb2cc 2183 u64 msr_data;
79168fd1 2184 u16 cs_sel, ss_sel;
c2ad2bb3 2185 u64 efer = 0;
e66bb2cc
AP		 2186
2187 /* syscall is not available in real mode */
2e901c4c 2188 if (ctxt->mode == X86EMUL_MODE_REAL ||
35d3d4a1
AK		 2189 ctxt->mode == X86EMUL_MODE_VM86)
2190 return emulate_ud(ctxt);
e66bb2cc 2191
c2226fc9
SB		 2192 if (!(em_syscall_is_enabled(ctxt)))
2193 return emulate_ud(ctxt);
2194
c2ad2bb3 2195 ops->get_msr(ctxt, MSR_EFER, &efer);
7b105ca2 2196 setup_syscalls_segments(ctxt, &cs, &ss);
e66bb2cc 2197
c2226fc9
SB		 2198 if (!(efer & EFER_SCE))
2199 return emulate_ud(ctxt);
2200
717746e3 2201 ops->get_msr(ctxt, MSR_STAR, &msr_data);
e66bb2cc 2202 msr_data >>= 32;
79168fd1
GN		 2203 cs_sel = (u16)(msr_data & 0xfffc);
2204 ss_sel = (u16)(msr_data + 8);
e66bb2cc 2205
c2ad2bb3 2206 if (efer & EFER_LMA) {
79168fd1 2207 cs.d = 0;
e66bb2cc
AP		 2208 cs.l = 1;
2209 }
1aa36616
AK		 2210 ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
2211 ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
e66bb2cc 2212
dd856efa 2213 *reg_write(ctxt, VCPU_REGS_RCX) = ctxt->_eip;
c2ad2bb3 2214 if (efer & EFER_LMA) {
e66bb2cc 2215#ifdef CONFIG_X86_64
dd856efa 2216 *reg_write(ctxt, VCPU_REGS_R11) = ctxt->eflags & ~EFLG_RF;
e66bb2cc 2217
717746e3 2218 ops->get_msr(ctxt,
3fb1b5db
GN		 2219 ctxt->mode == X86EMUL_MODE_PROT64 ?
2220 MSR_LSTAR : MSR_CSTAR, &msr_data);
9dac77fa 2221 ctxt->_eip = msr_data;
e66bb2cc 2222
717746e3 2223 ops->get_msr(ctxt, MSR_SYSCALL_MASK, &msr_data);
e66bb2cc
AP		 2224 ctxt->eflags &= ~(msr_data | EFLG_RF);
2225#endif
2226 } else {
2227 /* legacy mode */
717746e3 2228 ops->get_msr(ctxt, MSR_STAR, &msr_data);
9dac77fa 2229 ctxt->_eip = (u32)msr_data;
e66bb2cc
AP		 2230
2231 ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF);
2232 }
2233
e54cfa97 2234 return X86EMUL_CONTINUE;
e66bb2cc
AP		 2235}
2236
e01991e7 2237static int em_sysenter(struct x86_emulate_ctxt *ctxt)
8c604352 2238{
0225fb50 2239 const struct x86_emulate_ops *ops = ctxt->ops;
79168fd1 2240 struct desc_struct cs, ss;
8c604352 2241 u64 msr_data;
79168fd1 2242 u16 cs_sel, ss_sel;
c2ad2bb3 2243 u64 efer = 0;
8c604352 2244
7b105ca2 2245 ops->get_msr(ctxt, MSR_EFER, &efer);
a0044755 2246 /* inject #GP if in real mode */
35d3d4a1
AK		 2247 if (ctxt->mode == X86EMUL_MODE_REAL)
2248 return emulate_gp(ctxt, 0);
8c604352 2249
1a18a69b
AK		 2250 /*
2251 * Not recognized on AMD in compat mode (but is recognized in legacy
2252 * mode).
2253 */
2254 if ((ctxt->mode == X86EMUL_MODE_PROT32) && (efer & EFER_LMA)
2255 && !vendor_intel(ctxt))
2256 return emulate_ud(ctxt);
2257
8c604352
AP		 2258 /* XXX sysenter/sysexit have not been tested in 64bit mode.
2259 * Therefore, we inject an #UD.
2260 */
35d3d4a1
AK		 2261 if (ctxt->mode == X86EMUL_MODE_PROT64)
2262 return emulate_ud(ctxt);
8c604352 2263
7b105ca2 2264 setup_syscalls_segments(ctxt, &cs, &ss);
8c604352 2265
717746e3 2266 ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data);
8c604352
AP		 2267 switch (ctxt->mode) {
2268 case X86EMUL_MODE_PROT32:
35d3d4a1
AK		 2269 if ((msr_data & 0xfffc) == 0x0)
2270 return emulate_gp(ctxt, 0);
8c604352
AP		 2271 break;
2272 case X86EMUL_MODE_PROT64:
35d3d4a1
AK		 2273 if (msr_data == 0x0)
2274 return emulate_gp(ctxt, 0);
8c604352 2275 break;
9d1b39a9
GN		 2276 default:
2277 break;
8c604352
AP		 2278 }
2279
2280 ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF);
79168fd1
GN		 2281 cs_sel = (u16)msr_data;
2282 cs_sel &= ~SELECTOR_RPL_MASK;
2283 ss_sel = cs_sel + 8;
2284 ss_sel &= ~SELECTOR_RPL_MASK;
c2ad2bb3 2285 if (ctxt->mode == X86EMUL_MODE_PROT64 || (efer & EFER_LMA)) {
79168fd1 2286 cs.d = 0;
8c604352
AP		 2287 cs.l = 1;
2288 }
2289
1aa36616
AK		 2290 ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
2291 ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
8c604352 2292
717746e3 2293 ops->get_msr(ctxt, MSR_IA32_SYSENTER_EIP, &msr_data);
9dac77fa 2294 ctxt->_eip = msr_data;
8c604352 2295
717746e3 2296 ops->get_msr(ctxt, MSR_IA32_SYSENTER_ESP, &msr_data);
dd856efa 2297 *reg_write(ctxt, VCPU_REGS_RSP) = msr_data;
8c604352 2298
e54cfa97 2299 return X86EMUL_CONTINUE;
8c604352
AP		 2300}
2301
e01991e7 2302static int em_sysexit(struct x86_emulate_ctxt *ctxt)
4668f050 2303{
0225fb50 2304 const struct x86_emulate_ops *ops = ctxt->ops;
79168fd1 2305 struct desc_struct cs, ss;
4668f050
AP		 2306 u64 msr_data;
2307 int usermode;
1249b96e 2308 u16 cs_sel = 0, ss_sel = 0;
4668f050 2309
a0044755
GN		 2310 /* inject #GP if in real mode or Virtual 8086 mode */
2311 if (ctxt->mode == X86EMUL_MODE_REAL ||
35d3d4a1
AK		 2312 ctxt->mode == X86EMUL_MODE_VM86)
2313 return emulate_gp(ctxt, 0);
4668f050 2314
7b105ca2 2315 setup_syscalls_segments(ctxt, &cs, &ss);
4668f050 2316
9dac77fa 2317 if ((ctxt->rex_prefix & 0x8) != 0x0)
4668f050
AP		 2318 usermode = X86EMUL_MODE_PROT64;
2319 else
2320 usermode = X86EMUL_MODE_PROT32;
2321
2322 cs.dpl = 3;
2323 ss.dpl = 3;
717746e3 2324 ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data);
4668f050
AP		 2325 switch (usermode) {
2326 case X86EMUL_MODE_PROT32:
79168fd1 2327 cs_sel = (u16)(msr_data + 16);
35d3d4a1
AK		 2328 if ((msr_data & 0xfffc) == 0x0)
2329 return emulate_gp(ctxt, 0);
79168fd1 2330 ss_sel = (u16)(msr_data + 24);
4668f050
AP		 2331 break;
2332 case X86EMUL_MODE_PROT64:
79168fd1 2333 cs_sel = (u16)(msr_data + 32);
35d3d4a1
AK		 2334 if (msr_data == 0x0)
2335 return emulate_gp(ctxt, 0);
79168fd1
GN		 2336 ss_sel = cs_sel + 8;
2337 cs.d = 0;
4668f050
AP		 2338 cs.l = 1;
2339 break;
2340 }
79168fd1
GN		 2341 cs_sel |= SELECTOR_RPL_MASK;
2342 ss_sel |= SELECTOR_RPL_MASK;
4668f050 2343
1aa36616
AK		 2344 ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
2345 ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
4668f050 2346
dd856efa
AK		 2347 ctxt->_eip = reg_read(ctxt, VCPU_REGS_RDX);
2348 *reg_write(ctxt, VCPU_REGS_RSP) = reg_read(ctxt, VCPU_REGS_RCX);
4668f050 2349
e54cfa97 2350 return X86EMUL_CONTINUE;
4668f050
AP		 2351}
2352
7b105ca2 2353static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt)
f850e2e6
GN		 2354{
2355 int iopl;
2356 if (ctxt->mode == X86EMUL_MODE_REAL)
2357 return false;
2358 if (ctxt->mode == X86EMUL_MODE_VM86)
2359 return true;
2360 iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
7b105ca2 2361 return ctxt->ops->cpl(ctxt) > iopl;
f850e2e6
GN		 2362}
2363
2364static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt,
f850e2e6
GN		 2365 u16 port, u16 len)
2366{
0225fb50 2367 const struct x86_emulate_ops *ops = ctxt->ops;
79168fd1 2368 struct desc_struct tr_seg;
5601d05b 2369 u32 base3;
f850e2e6 2370 int r;
1aa36616 2371 u16 tr, io_bitmap_ptr, perm, bit_idx = port & 0x7;
f850e2e6 2372 unsigned mask = (1 << len) - 1;
5601d05b 2373 unsigned long base;
f850e2e6 2374
1aa36616 2375 ops->get_segment(ctxt, &tr, &tr_seg, &base3, VCPU_SREG_TR);
79168fd1 2376 if (!tr_seg.p)
f850e2e6 2377 return false;
79168fd1 2378 if (desc_limit_scaled(&tr_seg) < 103)
f850e2e6 2379 return false;
5601d05b
GN		 2380 base = get_desc_base(&tr_seg);
2381#ifdef CONFIG_X86_64
2382 base |= ((u64)base3) << 32;
2383#endif
0f65dd70 2384 r = ops->read_std(ctxt, base + 102, &io_bitmap_ptr, 2, NULL);
f850e2e6
GN		 2385 if (r != X86EMUL_CONTINUE)
2386 return false;
79168fd1 2387 if (io_bitmap_ptr + port/8 > desc_limit_scaled(&tr_seg))
f850e2e6 2388 return false;
0f65dd70 2389 r = ops->read_std(ctxt, base + io_bitmap_ptr + port/8, &perm, 2, NULL);
f850e2e6
GN		 2390 if (r != X86EMUL_CONTINUE)
2391 return false;
2392 if ((perm >> bit_idx) & mask)
2393 return false;
2394 return true;
2395}
2396
2397static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt,
f850e2e6
GN		 2398 u16 port, u16 len)
2399{
4fc40f07
GN		 2400 if (ctxt->perm_ok)
2401 return true;
2402
7b105ca2
TY		 2403 if (emulator_bad_iopl(ctxt))
2404 if (!emulator_io_port_access_allowed(ctxt, port, len))
f850e2e6 2405 return false;
4fc40f07
GN		 2406
2407 ctxt->perm_ok = true;
2408
f850e2e6
GN		 2409 return true;
2410}
2411
38ba30ba 2412static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt,
38ba30ba
GN		 2413 struct tss_segment_16 *tss)
2414{
9dac77fa 2415 tss->ip = ctxt->_eip;
38ba30ba 2416 tss->flag = ctxt->eflags;
dd856efa
AK		 2417 tss->ax = reg_read(ctxt, VCPU_REGS_RAX);
2418 tss->cx = reg_read(ctxt, VCPU_REGS_RCX);
2419 tss->dx = reg_read(ctxt, VCPU_REGS_RDX);
2420 tss->bx = reg_read(ctxt, VCPU_REGS_RBX);
2421 tss->sp = reg_read(ctxt, VCPU_REGS_RSP);
2422 tss->bp = reg_read(ctxt, VCPU_REGS_RBP);
2423 tss->si = reg_read(ctxt, VCPU_REGS_RSI);
2424 tss->di = reg_read(ctxt, VCPU_REGS_RDI);
38ba30ba 2425
1aa36616
AK		 2426 tss->es = get_segment_selector(ctxt, VCPU_SREG_ES);
2427 tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS);
2428 tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS);
2429 tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS);
2430 tss->ldt = get_segment_selector(ctxt, VCPU_SREG_LDTR);
38ba30ba
GN		 2431}
2432
2433static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt,
38ba30ba
GN		 2434 struct tss_segment_16 *tss)
2435{
38ba30ba 2436 int ret;
2356aaeb 2437 u8 cpl;
38ba30ba 2438
9dac77fa 2439 ctxt->_eip = tss->ip;
38ba30ba 2440 ctxt->eflags = tss->flag | 2;
dd856efa
AK		 2441 *reg_write(ctxt, VCPU_REGS_RAX) = tss->ax;
2442 *reg_write(ctxt, VCPU_REGS_RCX) = tss->cx;
2443 *reg_write(ctxt, VCPU_REGS_RDX) = tss->dx;
2444 *reg_write(ctxt, VCPU_REGS_RBX) = tss->bx;
2445 *reg_write(ctxt, VCPU_REGS_RSP) = tss->sp;
2446 *reg_write(ctxt, VCPU_REGS_RBP) = tss->bp;
2447 *reg_write(ctxt, VCPU_REGS_RSI) = tss->si;
2448 *reg_write(ctxt, VCPU_REGS_RDI) = tss->di;
38ba30ba
GN		 2449
2450 /*
2451 * SDM says that segment selectors are loaded before segment
2452 * descriptors
2453 */
1aa36616
AK		 2454 set_segment_selector(ctxt, tss->ldt, VCPU_SREG_LDTR);
2455 set_segment_selector(ctxt, tss->es, VCPU_SREG_ES);
2456 set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS);
2457 set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS);
2458 set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS);
38ba30ba 2459
2356aaeb
PB		 2460 cpl = tss->cs & 3;
2461
38ba30ba 2462 /*
fc058680 2463 * Now load segment descriptors. If fault happens at this stage
38ba30ba
GN		 2464 * it is handled in a context of new task
2465 */
5045b468 2466 ret = __load_segment_descriptor(ctxt, tss->ldt, VCPU_SREG_LDTR, cpl, true);
38ba30ba
GN		 2467 if (ret != X86EMUL_CONTINUE)
2468 return ret;
5045b468 2469 ret = __load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES, cpl, true);
38ba30ba
GN		 2470 if (ret != X86EMUL_CONTINUE)
2471 return ret;
5045b468 2472 ret = __load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS, cpl, true);
38ba30ba
GN		 2473 if (ret != X86EMUL_CONTINUE)
2474 return ret;
5045b468 2475 ret = __load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS, cpl, true);
38ba30ba
GN		 2476 if (ret != X86EMUL_CONTINUE)
2477 return ret;
5045b468 2478 ret = __load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS, cpl, true);
38ba30ba
GN		 2479 if (ret != X86EMUL_CONTINUE)
2480 return ret;
2481
2482 return X86EMUL_CONTINUE;
2483}
2484
2485static int task_switch_16(struct x86_emulate_ctxt *ctxt,
38ba30ba
GN		 2486 u16 tss_selector, u16 old_tss_sel,
2487 ulong old_tss_base, struct desc_struct *new_desc)
2488{
0225fb50 2489 const struct x86_emulate_ops *ops = ctxt->ops;
38ba30ba
GN		 2490 struct tss_segment_16 tss_seg;
2491 int ret;
bcc55cba 2492 u32 new_tss_base = get_desc_base(new_desc);
38ba30ba 2493
0f65dd70 2494 ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
bcc55cba 2495 &ctxt->exception);
db297e3d 2496 if (ret != X86EMUL_CONTINUE)
38ba30ba 2497 /* FIXME: need to provide precise fault address */
38ba30ba 2498 return ret;
38ba30ba 2499
7b105ca2 2500 save_state_to_tss16(ctxt, &tss_seg);
38ba30ba 2501
0f65dd70 2502 ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
bcc55cba 2503 &ctxt->exception);
db297e3d 2504 if (ret != X86EMUL_CONTINUE)
38ba30ba 2505 /* FIXME: need to provide precise fault address */
38ba30ba 2506 return ret;
38ba30ba 2507
0f65dd70 2508 ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg,
bcc55cba 2509 &ctxt->exception);
db297e3d 2510 if (ret != X86EMUL_CONTINUE)
38ba30ba 2511 /* FIXME: need to provide precise fault address */
38ba30ba 2512 return ret;
38ba30ba
GN		 2513
2514 if (old_tss_sel != 0xffff) {
2515 tss_seg.prev_task_link = old_tss_sel;
2516
0f65dd70 2517 ret = ops->write_std(ctxt, new_tss_base,
38ba30ba
GN		 2518 &tss_seg.prev_task_link,
2519 sizeof tss_seg.prev_task_link,
0f65dd70 2520 &ctxt->exception);
db297e3d 2521 if (ret != X86EMUL_CONTINUE)
38ba30ba 2522 /* FIXME: need to provide precise fault address */
38ba30ba 2523 return ret;
38ba30ba
GN		 2524 }
2525
7b105ca2 2526 return load_state_from_tss16(ctxt, &tss_seg);
38ba30ba
GN		 2527}
2528
2529static void save_state_to_tss32(struct x86_emulate_ctxt *ctxt,
38ba30ba
GN		 2530 struct tss_segment_32 *tss)
2531{
5c7411e2 2532 /* CR3 and ldt selector are not saved intentionally */
9dac77fa 2533 tss->eip = ctxt->_eip;
38ba30ba 2534 tss->eflags = ctxt->eflags;
dd856efa
AK		 2535 tss->eax = reg_read(ctxt, VCPU_REGS_RAX);
2536 tss->ecx = reg_read(ctxt, VCPU_REGS_RCX);
2537 tss->edx = reg_read(ctxt, VCPU_REGS_RDX);
2538 tss->ebx = reg_read(ctxt, VCPU_REGS_RBX);
2539 tss->esp = reg_read(ctxt, VCPU_REGS_RSP);
2540 tss->ebp = reg_read(ctxt, VCPU_REGS_RBP);
2541 tss->esi = reg_read(ctxt, VCPU_REGS_RSI);
2542 tss->edi = reg_read(ctxt, VCPU_REGS_RDI);
38ba30ba 2543
1aa36616
AK		 2544 tss->es = get_segment_selector(ctxt, VCPU_SREG_ES);
2545 tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS);
2546 tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS);
2547 tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS);
2548 tss->fs = get_segment_selector(ctxt, VCPU_SREG_FS);
2549 tss->gs = get_segment_selector(ctxt, VCPU_SREG_GS);
38ba30ba
GN		 2550}
2551
2552static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt,
38ba30ba
GN		 2553 struct tss_segment_32 *tss)
2554{
38ba30ba 2555 int ret;
2356aaeb 2556 u8 cpl;
38ba30ba 2557
7b105ca2 2558 if (ctxt->ops->set_cr(ctxt, 3, tss->cr3))
35d3d4a1 2559 return emulate_gp(ctxt, 0);
9dac77fa 2560 ctxt->_eip = tss->eip;
38ba30ba 2561 ctxt->eflags = tss->eflags | 2;
4cee4798
KW		 2562
2563 /* General purpose registers */
dd856efa
AK		 2564 *reg_write(ctxt, VCPU_REGS_RAX) = tss->eax;
2565 *reg_write(ctxt, VCPU_REGS_RCX) = tss->ecx;
2566 *reg_write(ctxt, VCPU_REGS_RDX) = tss->edx;
2567 *reg_write(ctxt, VCPU_REGS_RBX) = tss->ebx;
2568 *reg_write(ctxt, VCPU_REGS_RSP) = tss->esp;
2569 *reg_write(ctxt, VCPU_REGS_RBP) = tss->ebp;
2570 *reg_write(ctxt, VCPU_REGS_RSI) = tss->esi;
2571 *reg_write(ctxt, VCPU_REGS_RDI) = tss->edi;
38ba30ba
GN		 2572
2573 /*
2574 * SDM says that segment selectors are loaded before segment
2356aaeb
PB		 2575 * descriptors. This is important because CPL checks will
2576 * use CS.RPL.
38ba30ba 2577 */
1aa36616
AK		 2578 set_segment_selector(ctxt, tss->ldt_selector, VCPU_SREG_LDTR);
2579 set_segment_selector(ctxt, tss->es, VCPU_SREG_ES);
2580 set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS);
2581 set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS);
2582 set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS);
2583 set_segment_selector(ctxt, tss->fs, VCPU_SREG_FS);
2584 set_segment_selector(ctxt, tss->gs, VCPU_SREG_GS);
38ba30ba 2585
4cee4798
KW		 2586 /*
2587 * If we're switching between Protected Mode and VM86, we need to make
2588 * sure to update the mode before loading the segment descriptors so
2589 * that the selectors are interpreted correctly.
4cee4798 2590 */
2356aaeb 2591 if (ctxt->eflags & X86_EFLAGS_VM) {
4cee4798 2592 ctxt->mode = X86EMUL_MODE_VM86;
2356aaeb
PB		 2593 cpl = 3;
2594 } else {
4cee4798 2595 ctxt->mode = X86EMUL_MODE_PROT32;
2356aaeb
PB		 2596 cpl = tss->cs & 3;
2597 }
4cee4798 2598
38ba30ba
GN		 2599 /*
2600 * Now load segment descriptors. If fault happenes at this stage
2601 * it is handled in a context of new task
2602 */
5045b468 2603 ret = __load_segment_descriptor(ctxt, tss->ldt_selector, VCPU_SREG_LDTR, cpl, true);
38ba30ba
GN		 2604 if (ret != X86EMUL_CONTINUE)
2605 return ret;
5045b468 2606 ret = __load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES, cpl, true);
38ba30ba
GN		 2607 if (ret != X86EMUL_CONTINUE)
2608 return ret;
5045b468 2609 ret = __load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS, cpl, true);
38ba30ba
GN		 2610 if (ret != X86EMUL_CONTINUE)
2611 return ret;
5045b468 2612 ret = __load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS, cpl, true);
38ba30ba
GN		 2613 if (ret != X86EMUL_CONTINUE)
2614 return ret;
5045b468 2615 ret = __load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS, cpl, true);
38ba30ba
GN		 2616 if (ret != X86EMUL_CONTINUE)
2617 return ret;
5045b468 2618 ret = __load_segment_descriptor(ctxt, tss->fs, VCPU_SREG_FS, cpl, true);
38ba30ba
GN		 2619 if (ret != X86EMUL_CONTINUE)
2620 return ret;
5045b468 2621 ret = __load_segment_descriptor(ctxt, tss->gs, VCPU_SREG_GS, cpl, true);
38ba30ba
GN		 2622 if (ret != X86EMUL_CONTINUE)
2623 return ret;
2624
2625 return X86EMUL_CONTINUE;
2626}
2627
2628static int task_switch_32(struct x86_emulate_ctxt *ctxt,
38ba30ba
GN		 2629 u16 tss_selector, u16 old_tss_sel,
2630 ulong old_tss_base, struct desc_struct *new_desc)
2631{
0225fb50 2632 const struct x86_emulate_ops *ops = ctxt->ops;
38ba30ba
GN		 2633 struct tss_segment_32 tss_seg;
2634 int ret;
bcc55cba 2635 u32 new_tss_base = get_desc_base(new_desc);
5c7411e2
NA		 2636 u32 eip_offset = offsetof(struct tss_segment_32, eip);
2637 u32 ldt_sel_offset = offsetof(struct tss_segment_32, ldt_selector);
38ba30ba 2638
0f65dd70 2639 ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
bcc55cba 2640 &ctxt->exception);
db297e3d 2641 if (ret != X86EMUL_CONTINUE)
38ba30ba 2642 /* FIXME: need to provide precise fault address */
38ba30ba 2643 return ret;
38ba30ba 2644
7b105ca2 2645 save_state_to_tss32(ctxt, &tss_seg);
38ba30ba 2646
5c7411e2
NA		 2647 /* Only GP registers and segment selectors are saved */
2648 ret = ops->write_std(ctxt, old_tss_base + eip_offset, &tss_seg.eip,
2649 ldt_sel_offset - eip_offset, &ctxt->exception);
db297e3d 2650 if (ret != X86EMUL_CONTINUE)
38ba30ba 2651 /* FIXME: need to provide precise fault address */
38ba30ba 2652 return ret;
38ba30ba 2653
0f65dd70 2654 ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg,
bcc55cba 2655 &ctxt->exception);
db297e3d 2656 if (ret != X86EMUL_CONTINUE)
38ba30ba 2657 /* FIXME: need to provide precise fault address */
38ba30ba 2658 return ret;
38ba30ba
GN		 2659
2660 if (old_tss_sel != 0xffff) {
2661 tss_seg.prev_task_link = old_tss_sel;
2662
0f65dd70 2663 ret = ops->write_std(ctxt, new_tss_base,
38ba30ba
GN		 2664 &tss_seg.prev_task_link,
2665 sizeof tss_seg.prev_task_link,
0f65dd70 2666 &ctxt->exception);
db297e3d 2667 if (ret != X86EMUL_CONTINUE)
38ba30ba 2668 /* FIXME: need to provide precise fault address */
38ba30ba 2669 return ret;
38ba30ba
GN		 2670 }
2671
7b105ca2 2672 return load_state_from_tss32(ctxt, &tss_seg);
38ba30ba
GN		 2673}
2674
2675static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
7f3d35fd 2676 u16 tss_selector, int idt_index, int reason,
e269fb21 2677 bool has_error_code, u32 error_code)
38ba30ba 2678{
0225fb50 2679 const struct x86_emulate_ops *ops = ctxt->ops;
38ba30ba
GN		 2680 struct desc_struct curr_tss_desc, next_tss_desc;
2681 int ret;
1aa36616 2682 u16 old_tss_sel = get_segment_selector(ctxt, VCPU_SREG_TR);
38ba30ba 2683 ulong old_tss_base =
4bff1e86 2684 ops->get_cached_segment_base(ctxt, VCPU_SREG_TR);
ceffb459 2685 u32 desc_limit;
e919464b 2686 ulong desc_addr;
38ba30ba
GN		 2687
2688 /* FIXME: old_tss_base == ~0 ? */
2689
e919464b 2690 ret = read_segment_descriptor(ctxt, tss_selector, &next_tss_desc, &desc_addr);
38ba30ba
GN		 2691 if (ret != X86EMUL_CONTINUE)
2692 return ret;
e919464b 2693 ret = read_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc, &desc_addr);
38ba30ba
GN		 2694 if (ret != X86EMUL_CONTINUE)
2695 return ret;
2696
2697 /* FIXME: check that next_tss_desc is tss */
2698
7f3d35fd
KW		 2699 /*
2700 * Check privileges. The three cases are task switch caused by...
2701 *
2702 * 1. jmp/call/int to task gate: Check against DPL of the task gate
2703 * 2. Exception/IRQ/iret: No check is performed
fc058680 2704 * 3. jmp/call to TSS: Check against DPL of the TSS
7f3d35fd
KW		 2705 */
2706 if (reason == TASK_SWITCH_GATE) {
2707 if (idt_index != -1) {
2708 /* Software interrupts */
2709 struct desc_struct task_gate_desc;
2710 int dpl;
2711
2712 ret = read_interrupt_descriptor(ctxt, idt_index,
2713 &task_gate_desc);
2714 if (ret != X86EMUL_CONTINUE)
2715 return ret;
2716
2717 dpl = task_gate_desc.dpl;
2718 if ((tss_selector & 3) > dpl || ops->cpl(ctxt) > dpl)
2719 return emulate_gp(ctxt, (idt_index << 3) | 0x2);
2720 }
2721 } else if (reason != TASK_SWITCH_IRET) {
2722 int dpl = next_tss_desc.dpl;
2723 if ((tss_selector & 3) > dpl || ops->cpl(ctxt) > dpl)
2724 return emulate_gp(ctxt, tss_selector);
38ba30ba
GN		 2725 }
2726
7f3d35fd 2727
ceffb459
GN		 2728 desc_limit = desc_limit_scaled(&next_tss_desc);
2729 if (!next_tss_desc.p ||
2730 ((desc_limit < 0x67 && (next_tss_desc.type & 8)) ||
2731 desc_limit < 0x2b)) {
54b8486f 2732 emulate_ts(ctxt, tss_selector & 0xfffc);
38ba30ba
GN		 2733 return X86EMUL_PROPAGATE_FAULT;
2734 }
2735
2736 if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
2737 curr_tss_desc.type &= ~(1 << 1); /* clear busy flag */
7b105ca2 2738 write_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc);
38ba30ba
GN		 2739 }
2740
2741 if (reason == TASK_SWITCH_IRET)
2742 ctxt->eflags = ctxt->eflags & ~X86_EFLAGS_NT;
2743
2744 /* set back link to prev task only if NT bit is set in eflags
fc058680 2745 note that old_tss_sel is not used after this point */
38ba30ba
GN		 2746 if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE)
2747 old_tss_sel = 0xffff;
2748
2749 if (next_tss_desc.type & 8)
7b105ca2 2750 ret = task_switch_32(ctxt, tss_selector, old_tss_sel,
38ba30ba
GN		 2751 old_tss_base, &next_tss_desc);
2752 else
7b105ca2 2753 ret = task_switch_16(ctxt, tss_selector, old_tss_sel,
38ba30ba 2754 old_tss_base, &next_tss_desc);
0760d448
JK		 2755 if (ret != X86EMUL_CONTINUE)
2756 return ret;
38ba30ba
GN		 2757
2758 if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE)
2759 ctxt->eflags = ctxt->eflags | X86_EFLAGS_NT;
2760
2761 if (reason != TASK_SWITCH_IRET) {
2762 next_tss_desc.type |= (1 << 1); /* set busy flag */
7b105ca2 2763 write_segment_descriptor(ctxt, tss_selector, &next_tss_desc);
38ba30ba
GN		 2764 }
2765
717746e3 2766 ops->set_cr(ctxt, 0, ops->get_cr(ctxt, 0) | X86_CR0_TS);
1aa36616 2767 ops->set_segment(ctxt, tss_selector, &next_tss_desc, 0, VCPU_SREG_TR);
38ba30ba 2768
e269fb21 2769 if (has_error_code) {
9dac77fa
AK		 2770 ctxt->op_bytes = ctxt->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2;
2771 ctxt->lock_prefix = 0;
2772 ctxt->src.val = (unsigned long) error_code;
4487b3b4 2773 ret = em_push(ctxt);
e269fb21
JK		 2774 }
2775
38ba30ba
GN		 2776 return ret;
2777}
2778
2779int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
7f3d35fd 2780 u16 tss_selector, int idt_index, int reason,
e269fb21 2781 bool has_error_code, u32 error_code)
38ba30ba 2782{
38ba30ba
GN		 2783 int rc;
2784
dd856efa 2785 invalidate_registers(ctxt);
9dac77fa
AK		 2786 ctxt->_eip = ctxt->eip;
2787 ctxt->dst.type = OP_NONE;
38ba30ba 2788
7f3d35fd 2789 rc = emulator_do_task_switch(ctxt, tss_selector, idt_index, reason,
e269fb21 2790 has_error_code, error_code);
38ba30ba 2791
dd856efa 2792 if (rc == X86EMUL_CONTINUE) {
9dac77fa 2793 ctxt->eip = ctxt->_eip;
dd856efa
AK		 2794 writeback_registers(ctxt);
2795 }
38ba30ba 2796
a0c0ab2f 2797 return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
38ba30ba
GN		 2798}
2799
f3bd64c6
GN		 2800static void string_addr_inc(struct x86_emulate_ctxt *ctxt, int reg,
2801 struct operand *op)
a682e354 2802{
b3356bf0 2803 int df = (ctxt->eflags & EFLG_DF) ? -op->count : op->count;
a682e354 2804
dd856efa
AK		 2805 register_address_increment(ctxt, reg_rmw(ctxt, reg), df * op->bytes);
2806 op->addr.mem.ea = register_address(ctxt, reg_read(ctxt, reg));
a682e354
GN		 2807}
2808
7af04fc0
AK		 2809static int em_das(struct x86_emulate_ctxt *ctxt)
2810{
7af04fc0
AK		 2811 u8 al, old_al;
2812 bool af, cf, old_cf;
2813
2814 cf = ctxt->eflags & X86_EFLAGS_CF;
9dac77fa 2815 al = ctxt->dst.val;
7af04fc0
AK		 2816
2817 old_al = al;
2818 old_cf = cf;
2819 cf = false;
2820 af = ctxt->eflags & X86_EFLAGS_AF;
2821 if ((al & 0x0f) > 9 || af) {
2822 al -= 6;
2823 cf = old_cf | (al >= 250);
2824 af = true;
2825 } else {
2826 af = false;
2827 }
2828 if (old_al > 0x99 || old_cf) {
2829 al -= 0x60;
2830 cf = true;
2831 }
2832
9dac77fa 2833 ctxt->dst.val = al;
7af04fc0 2834 /* Set PF, ZF, SF */
9dac77fa
AK		 2835 ctxt->src.type = OP_IMM;
2836 ctxt->src.val = 0;
2837 ctxt->src.bytes = 1;
158de57f 2838 fastop(ctxt, em_or);
7af04fc0
AK		 2839 ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF);
2840 if (cf)
2841 ctxt->eflags |= X86_EFLAGS_CF;
2842 if (af)
2843 ctxt->eflags |= X86_EFLAGS_AF;
2844 return X86EMUL_CONTINUE;
2845}
2846
a035d5c6
PB		 2847static int em_aam(struct x86_emulate_ctxt *ctxt)
2848{
2849 u8 al, ah;
2850
2851 if (ctxt->src.val == 0)
2852 return emulate_de(ctxt);
2853
2854 al = ctxt->dst.val & 0xff;
2855 ah = al / ctxt->src.val;
2856 al %= ctxt->src.val;
2857
2858 ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al | (ah << 8);
2859
2860 /* Set PF, ZF, SF */
2861 ctxt->src.type = OP_IMM;
2862 ctxt->src.val = 0;
2863 ctxt->src.bytes = 1;
2864 fastop(ctxt, em_or);
2865
2866 return X86EMUL_CONTINUE;
2867}
2868
7f662273
GN		 2869static int em_aad(struct x86_emulate_ctxt *ctxt)
2870{
2871 u8 al = ctxt->dst.val & 0xff;
2872 u8 ah = (ctxt->dst.val >> 8) & 0xff;
2873
2874 al = (al + (ah * ctxt->src.val)) & 0xff;
2875
2876 ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al;
2877
f583c29b
GN		 2878 /* Set PF, ZF, SF */
2879 ctxt->src.type = OP_IMM;
2880 ctxt->src.val = 0;
2881 ctxt->src.bytes = 1;
2882 fastop(ctxt, em_or);
7f662273
GN		 2883
2884 return X86EMUL_CONTINUE;
2885}
2886
d4ddafcd
TY		 2887static int em_call(struct x86_emulate_ctxt *ctxt)
2888{
2889 long rel = ctxt->src.val;
2890
2891 ctxt->src.val = (unsigned long)ctxt->_eip;
2892 jmp_rel(ctxt, rel);
2893 return em_push(ctxt);
2894}
2895
0ef753b8
AK		 2896static int em_call_far(struct x86_emulate_ctxt *ctxt)
2897{
0ef753b8
AK		 2898 u16 sel, old_cs;
2899 ulong old_eip;
2900 int rc;
2901
1aa36616 2902 old_cs = get_segment_selector(ctxt, VCPU_SREG_CS);
9dac77fa 2903 old_eip = ctxt->_eip;
0ef753b8 2904
9dac77fa 2905 memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);
7b105ca2 2906 if (load_segment_descriptor(ctxt, sel, VCPU_SREG_CS))
0ef753b8
AK		 2907 return X86EMUL_CONTINUE;
2908
9dac77fa
AK		 2909 ctxt->_eip = 0;
2910 memcpy(&ctxt->_eip, ctxt->src.valptr, ctxt->op_bytes);
0ef753b8 2911
9dac77fa 2912 ctxt->src.val = old_cs;
4487b3b4 2913 rc = em_push(ctxt);
0ef753b8
AK		 2914 if (rc != X86EMUL_CONTINUE)
2915 return rc;
2916
9dac77fa 2917 ctxt->src.val = old_eip;
4487b3b4 2918 return em_push(ctxt);
0ef753b8
AK		 2919}
2920
40ece7c7
AK		 2921static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt)
2922{
40ece7c7
AK		 2923 int rc;
2924
9dac77fa
AK		 2925 ctxt->dst.type = OP_REG;
2926 ctxt->dst.addr.reg = &ctxt->_eip;
2927 ctxt->dst.bytes = ctxt->op_bytes;
2928 rc = emulate_pop(ctxt, &ctxt->dst.val, ctxt->op_bytes);
40ece7c7
AK		 2929 if (rc != X86EMUL_CONTINUE)
2930 return rc;
5ad105e5 2931 rsp_increment(ctxt, ctxt->src.val);
40ece7c7
AK		 2932 return X86EMUL_CONTINUE;
2933}
2934
e4f973ae
TY		 2935static int em_xchg(struct x86_emulate_ctxt *ctxt)
2936{
e4f973ae 2937 /* Write back the register source. */
9dac77fa
AK		 2938 ctxt->src.val = ctxt->dst.val;
2939 write_register_operand(&ctxt->src);
e4f973ae
TY		 2940
2941 /* Write back the memory destination with implicit LOCK prefix. */
9dac77fa
AK		 2942 ctxt->dst.val = ctxt->src.orig_val;
2943 ctxt->lock_prefix = 1;
e4f973ae
TY		 2944 return X86EMUL_CONTINUE;
2945}
2946
5c82aa29
AK		 2947static int em_imul_3op(struct x86_emulate_ctxt *ctxt)
2948{
9dac77fa 2949 ctxt->dst.val = ctxt->src2.val;
4d758349 2950 return fastop(ctxt, em_imul);
5c82aa29
AK		 2951}
2952
61429142
AK		 2953static int em_cwd(struct x86_emulate_ctxt *ctxt)
2954{
9dac77fa
AK		 2955 ctxt->dst.type = OP_REG;
2956 ctxt->dst.bytes = ctxt->src.bytes;
dd856efa 2957 ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX);
9dac77fa 2958 ctxt->dst.val = ~((ctxt->src.val >> (ctxt->src.bytes * 8 - 1)) - 1);
61429142
AK		 2959
2960 return X86EMUL_CONTINUE;
2961}
2962
48bb5d3c
AK		 2963static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
2964{
48bb5d3c
AK		 2965 u64 tsc = 0;
2966
717746e3 2967 ctxt->ops->get_msr(ctxt, MSR_IA32_TSC, &tsc);
dd856efa
AK		 2968 *reg_write(ctxt, VCPU_REGS_RAX) = (u32)tsc;
2969 *reg_write(ctxt, VCPU_REGS_RDX) = tsc >> 32;
48bb5d3c
AK		 2970 return X86EMUL_CONTINUE;
2971}
2972
222d21aa
AK		 2973static int em_rdpmc(struct x86_emulate_ctxt *ctxt)
2974{
2975 u64 pmc;
2976
dd856efa 2977 if (ctxt->ops->read_pmc(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &pmc))
222d21aa 2978 return emulate_gp(ctxt, 0);
dd856efa
AK		 2979 *reg_write(ctxt, VCPU_REGS_RAX) = (u32)pmc;
2980 *reg_write(ctxt, VCPU_REGS_RDX) = pmc >> 32;
222d21aa
AK		 2981 return X86EMUL_CONTINUE;
2982}
2983
b9eac5f4
AK		 2984static int em_mov(struct x86_emulate_ctxt *ctxt)
2985{
49597d81 2986 memcpy(ctxt->dst.valptr, ctxt->src.valptr, ctxt->op_bytes);
b9eac5f4
AK		 2987 return X86EMUL_CONTINUE;
2988}
2989
84cffe49
BP		 2990#define FFL(x) bit(X86_FEATURE_##x)
2991
2992static int em_movbe(struct x86_emulate_ctxt *ctxt)
2993{
2994 u32 ebx, ecx, edx, eax = 1;
2995 u16 tmp;
2996
2997 /*
2998 * Check MOVBE is set in the guest-visible CPUID leaf.
2999 */
3000 ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
3001 if (!(ecx & FFL(MOVBE)))
3002 return emulate_ud(ctxt);
3003
3004 switch (ctxt->op_bytes) {
3005 case 2:
3006 /*
3007 * From MOVBE definition: "...When the operand size is 16 bits,
3008 * the upper word of the destination register remains unchanged
3009 * ..."
3010 *
3011 * Both casting ->valptr and ->val to u16 breaks strict aliasing
3012 * rules so we have to do the operation almost per hand.
3013 */
3014 tmp = (u16)ctxt->src.val;
3015 ctxt->dst.val &= ~0xffffUL;
3016 ctxt->dst.val |= (unsigned long)swab16(tmp);
3017 break;
3018 case 4:
3019 ctxt->dst.val = swab32((u32)ctxt->src.val);
3020 break;
3021 case 8:
3022 ctxt->dst.val = swab64(ctxt->src.val);
3023 break;
3024 default:
3025 return X86EMUL_PROPAGATE_FAULT;
3026 }
3027 return X86EMUL_CONTINUE;
3028}
3029
bc00f8d2
TY		 3030static int em_cr_write(struct x86_emulate_ctxt *ctxt)
3031{
3032 if (ctxt->ops->set_cr(ctxt, ctxt->modrm_reg, ctxt->src.val))
3033 return emulate_gp(ctxt, 0);
3034
3035 /* Disable writeback. */
3036 ctxt->dst.type = OP_NONE;
3037 return X86EMUL_CONTINUE;
3038}
3039
3040static int em_dr_write(struct x86_emulate_ctxt *ctxt)
3041{
3042 unsigned long val;
3043
3044 if (ctxt->mode == X86EMUL_MODE_PROT64)
3045 val = ctxt->src.val & ~0ULL;
3046 else
3047 val = ctxt->src.val & ~0U;
3048
3049 /* #UD condition is already handled. */
3050 if (ctxt->ops->set_dr(ctxt, ctxt->modrm_reg, val) < 0)
3051 return emulate_gp(ctxt, 0);
3052
3053 /* Disable writeback. */
3054 ctxt->dst.type = OP_NONE;
3055 return X86EMUL_CONTINUE;
3056}
3057
e1e210b0
TY		 3058static int em_wrmsr(struct x86_emulate_ctxt *ctxt)
3059{
3060 u64 msr_data;
3061
dd856efa
AK		 3062 msr_data = (u32)reg_read(ctxt, VCPU_REGS_RAX)
3063 | ((u64)reg_read(ctxt, VCPU_REGS_RDX) << 32);
3064 if (ctxt->ops->set_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), msr_data))
e1e210b0
TY		 3065 return emulate_gp(ctxt, 0);
3066
3067 return X86EMUL_CONTINUE;
3068}
3069
3070static int em_rdmsr(struct x86_emulate_ctxt *ctxt)
3071{
3072 u64 msr_data;
3073
dd856efa 3074 if (ctxt->ops->get_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &msr_data))
e1e210b0
TY		 3075 return emulate_gp(ctxt, 0);
3076
dd856efa
AK		 3077 *reg_write(ctxt, VCPU_REGS_RAX) = (u32)msr_data;
3078 *reg_write(ctxt, VCPU_REGS_RDX) = msr_data >> 32;
e1e210b0
TY		 3079 return X86EMUL_CONTINUE;
3080}
3081
1bd5f469
TY		 3082static int em_mov_rm_sreg(struct x86_emulate_ctxt *ctxt)
3083{
9dac77fa 3084 if (ctxt->modrm_reg > VCPU_SREG_GS)
1bd5f469
TY		 3085 return emulate_ud(ctxt);
3086
9dac77fa 3087 ctxt->dst.val = get_segment_selector(ctxt, ctxt->modrm_reg);
1bd5f469
TY		 3088 return X86EMUL_CONTINUE;
3089}
3090
3091static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt)
3092{
9dac77fa 3093 u16 sel = ctxt->src.val;
1bd5f469 3094
9dac77fa 3095 if (ctxt->modrm_reg == VCPU_SREG_CS || ctxt->modrm_reg > VCPU_SREG_GS)
1bd5f469
TY		 3096 return emulate_ud(ctxt);
3097
9dac77fa 3098 if (ctxt->modrm_reg == VCPU_SREG_SS)
1bd5f469
TY		 3099 ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS;
3100
3101 /* Disable writeback. */
9dac77fa
AK		 3102 ctxt->dst.type = OP_NONE;
3103 return load_segment_descriptor(ctxt, sel, ctxt->modrm_reg);
1bd5f469
TY		 3104}
3105
a14e579f
AK		 3106static int em_lldt(struct x86_emulate_ctxt *ctxt)
3107{
3108 u16 sel = ctxt->src.val;
3109
3110 /* Disable writeback. */
3111 ctxt->dst.type = OP_NONE;
3112 return load_segment_descriptor(ctxt, sel, VCPU_SREG_LDTR);
3113}
3114
80890006
AK		 3115static int em_ltr(struct x86_emulate_ctxt *ctxt)
3116{
3117 u16 sel = ctxt->src.val;
3118
3119 /* Disable writeback. */
3120 ctxt->dst.type = OP_NONE;
3121 return load_segment_descriptor(ctxt, sel, VCPU_SREG_TR);
3122}
3123
38503911
AK		 3124static int em_invlpg(struct x86_emulate_ctxt *ctxt)
3125{
9fa088f4
AK		 3126 int rc;
3127 ulong linear;
3128
9dac77fa 3129 rc = linearize(ctxt, ctxt->src.addr.mem, 1, false, &linear);
9fa088f4 3130 if (rc == X86EMUL_CONTINUE)
3cb16fe7 3131 ctxt->ops->invlpg(ctxt, linear);
38503911 3132 /* Disable writeback. */
9dac77fa 3133 ctxt->dst.type = OP_NONE;
38503911
AK		 3134 return X86EMUL_CONTINUE;
3135}
3136
2d04a05b
AK		 3137static int em_clts(struct x86_emulate_ctxt *ctxt)
3138{
3139 ulong cr0;
3140
3141 cr0 = ctxt->ops->get_cr(ctxt, 0);
3142 cr0 &= ~X86_CR0_TS;
3143 ctxt->ops->set_cr(ctxt, 0, cr0);
3144 return X86EMUL_CONTINUE;
3145}
3146
26d05cc7
AK		 3147static int em_vmcall(struct x86_emulate_ctxt *ctxt)
3148{
26d05cc7
AK		 3149 int rc;
3150
9dac77fa 3151 if (ctxt->modrm_mod != 3 || ctxt->modrm_rm != 1)
26d05cc7
AK		 3152 return X86EMUL_UNHANDLEABLE;
3153
3154 rc = ctxt->ops->fix_hypercall(ctxt);
3155 if (rc != X86EMUL_CONTINUE)
3156 return rc;
3157
3158 /* Let the processor re-execute the fixed hypercall */
9dac77fa 3159 ctxt->_eip = ctxt->eip;
26d05cc7 3160 /* Disable writeback. */
9dac77fa 3161 ctxt->dst.type = OP_NONE;
26d05cc7
AK		 3162 return X86EMUL_CONTINUE;
3163}
3164
96051572
AK		 3165static int emulate_store_desc_ptr(struct x86_emulate_ctxt *ctxt,
3166 void (*get)(struct x86_emulate_ctxt *ctxt,
3167 struct desc_ptr *ptr))
3168{
3169 struct desc_ptr desc_ptr;
3170
3171 if (ctxt->mode == X86EMUL_MODE_PROT64)
3172 ctxt->op_bytes = 8;
3173 get(ctxt, &desc_ptr);
3174 if (ctxt->op_bytes == 2) {
3175 ctxt->op_bytes = 4;
3176 desc_ptr.address &= 0x00ffffff;
3177 }
3178 /* Disable writeback. */
3179 ctxt->dst.type = OP_NONE;
3180 return segmented_write(ctxt, ctxt->dst.addr.mem,
3181 &desc_ptr, 2 + ctxt->op_bytes);
3182}
3183
3184static int em_sgdt(struct x86_emulate_ctxt *ctxt)
3185{
3186 return emulate_store_desc_ptr(ctxt, ctxt->ops->get_gdt);
3187}
3188
3189static int em_sidt(struct x86_emulate_ctxt *ctxt)
3190{
3191 return emulate_store_desc_ptr(ctxt, ctxt->ops->get_idt);
3192}
3193
26d05cc7
AK		 3194static int em_lgdt(struct x86_emulate_ctxt *ctxt)
3195{
26d05cc7
AK		 3196 struct desc_ptr desc_ptr;
3197 int rc;
3198
510425ff
AK		 3199 if (ctxt->mode == X86EMUL_MODE_PROT64)
3200 ctxt->op_bytes = 8;
9dac77fa 3201 rc = read_descriptor(ctxt, ctxt->src.addr.mem,
26d05cc7 3202 &desc_ptr.size, &desc_ptr.address,
9dac77fa 3203 ctxt->op_bytes);
26d05cc7
AK		 3204 if (rc != X86EMUL_CONTINUE)
3205 return rc;
3206 ctxt->ops->set_gdt(ctxt, &desc_ptr);
3207 /* Disable writeback. */
9dac77fa 3208 ctxt->dst.type = OP_NONE;
26d05cc7
AK		 3209 return X86EMUL_CONTINUE;
3210}
3211
5ef39c71 3212static int em_vmmcall(struct x86_emulate_ctxt *ctxt)
26d05cc7 3213{
26d05cc7
AK		 3214 int rc;
3215
5ef39c71
AK		 3216 rc = ctxt->ops->fix_hypercall(ctxt);
3217
26d05cc7 3218 /* Disable writeback. */
9dac77fa 3219 ctxt->dst.type = OP_NONE;
26d05cc7
AK		 3220 return rc;
3221}
3222
3223static int em_lidt(struct x86_emulate_ctxt *ctxt)
3224{
26d05cc7
AK		 3225 struct desc_ptr desc_ptr;
3226 int rc;
3227
510425ff
AK		 3228 if (ctxt->mode == X86EMUL_MODE_PROT64)
3229 ctxt->op_bytes = 8;
9dac77fa 3230 rc = read_descriptor(ctxt, ctxt->src.addr.mem,
509cf9fe 3231 &desc_ptr.size, &desc_ptr.address,
9dac77fa 3232 ctxt->op_bytes);
26d05cc7
AK		 3233 if (rc != X86EMUL_CONTINUE)
3234 return rc;
3235 ctxt->ops->set_idt(ctxt, &desc_ptr);
3236 /* Disable writeback. */
9dac77fa 3237 ctxt->dst.type = OP_NONE;
26d05cc7
AK		 3238 return X86EMUL_CONTINUE;
3239}
3240
3241static int em_smsw(struct x86_emulate_ctxt *ctxt)
3242{
32e94d06
NA		 3243 if (ctxt->dst.type == OP_MEM)
3244 ctxt->dst.bytes = 2;
9dac77fa 3245 ctxt->dst.val = ctxt->ops->get_cr(ctxt, 0);
26d05cc7
AK		 3246 return X86EMUL_CONTINUE;
3247}
3248
3249static int em_lmsw(struct x86_emulate_ctxt *ctxt)
3250{
26d05cc7 3251 ctxt->ops->set_cr(ctxt, 0, (ctxt->ops->get_cr(ctxt, 0) & ~0x0eul)
9dac77fa
AK		 3252 | (ctxt->src.val & 0x0f));
3253 ctxt->dst.type = OP_NONE;
26d05cc7
AK		 3254 return X86EMUL_CONTINUE;
3255}
3256
d06e03ad
TY		 3257static int em_loop(struct x86_emulate_ctxt *ctxt)
3258{
dd856efa
AK		 3259 register_address_increment(ctxt, reg_rmw(ctxt, VCPU_REGS_RCX), -1);
3260 if ((address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) != 0) &&
9dac77fa
AK		 3261 (ctxt->b == 0xe2 || test_cc(ctxt->b ^ 0x5, ctxt->eflags)))
3262 jmp_rel(ctxt, ctxt->src.val);
d06e03ad
TY		 3263
3264 return X86EMUL_CONTINUE;
3265}
3266
3267static int em_jcxz(struct x86_emulate_ctxt *ctxt)
3268{
dd856efa 3269 if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0)
9dac77fa 3270 jmp_rel(ctxt, ctxt->src.val);
d06e03ad
TY		 3271
3272 return X86EMUL_CONTINUE;
3273}
3274
d7841a4b
TY		 3275static int em_in(struct x86_emulate_ctxt *ctxt)
3276{
3277 if (!pio_in_emulated(ctxt, ctxt->dst.bytes, ctxt->src.val,
3278 &ctxt->dst.val))
3279 return X86EMUL_IO_NEEDED;
3280
3281 return X86EMUL_CONTINUE;
3282}
3283
3284static int em_out(struct x86_emulate_ctxt *ctxt)
3285{
3286 ctxt->ops->pio_out_emulated(ctxt, ctxt->src.bytes, ctxt->dst.val,
3287 &ctxt->src.val, 1);
3288 /* Disable writeback. */
3289 ctxt->dst.type = OP_NONE;
3290 return X86EMUL_CONTINUE;
3291}
3292
f411e6cd
TY		 3293static int em_cli(struct x86_emulate_ctxt *ctxt)
3294{
3295 if (emulator_bad_iopl(ctxt))
3296 return emulate_gp(ctxt, 0);
3297
3298 ctxt->eflags &= ~X86_EFLAGS_IF;
3299 return X86EMUL_CONTINUE;
3300}
3301
3302static int em_sti(struct x86_emulate_ctxt *ctxt)
3303{
3304 if (emulator_bad_iopl(ctxt))
3305 return emulate_gp(ctxt, 0);
3306
3307 ctxt->interruptibility = KVM_X86_SHADOW_INT_STI;
3308 ctxt->eflags |= X86_EFLAGS_IF;
3309 return X86EMUL_CONTINUE;
3310}
3311
6d6eede4
AK		 3312static int em_cpuid(struct x86_emulate_ctxt *ctxt)
3313{
3314 u32 eax, ebx, ecx, edx;
3315
dd856efa
AK		 3316 eax = reg_read(ctxt, VCPU_REGS_RAX);
3317 ecx = reg_read(ctxt, VCPU_REGS_RCX);
6d6eede4 3318 ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
dd856efa
AK		 3319 *reg_write(ctxt, VCPU_REGS_RAX) = eax;
3320 *reg_write(ctxt, VCPU_REGS_RBX) = ebx;
3321 *reg_write(ctxt, VCPU_REGS_RCX) = ecx;
3322 *reg_write(ctxt, VCPU_REGS_RDX) = edx;
6d6eede4
AK		 3323 return X86EMUL_CONTINUE;
3324}
3325
98f73630
PB		 3326static int em_sahf(struct x86_emulate_ctxt *ctxt)
3327{
3328 u32 flags;
3329
3330 flags = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF;
3331 flags &= *reg_rmw(ctxt, VCPU_REGS_RAX) >> 8;
3332
3333 ctxt->eflags &= ~0xffUL;
3334 ctxt->eflags |= flags | X86_EFLAGS_FIXED;
3335 return X86EMUL_CONTINUE;
3336}
3337
2dd7caa0
AK		 3338static int em_lahf(struct x86_emulate_ctxt *ctxt)
3339{
dd856efa
AK		 3340 *reg_rmw(ctxt, VCPU_REGS_RAX) &= ~0xff00UL;
3341 *reg_rmw(ctxt, VCPU_REGS_RAX) |= (ctxt->eflags & 0xff) << 8;
2dd7caa0
AK		 3342 return X86EMUL_CONTINUE;
3343}
3344
9299836e
AK		 3345static int em_bswap(struct x86_emulate_ctxt *ctxt)
3346{
3347 switch (ctxt->op_bytes) {
3348#ifdef CONFIG_X86_64
3349 case 8:
3350 asm("bswap %0" : "+r"(ctxt->dst.val));
3351 break;
3352#endif
3353 default:
3354 asm("bswap %0" : "+r"(*(u32 *)&ctxt->dst.val));
3355 break;
3356 }
3357 return X86EMUL_CONTINUE;
3358}
3359
cfec82cb
JR		 3360static bool valid_cr(int nr)
3361{
3362 switch (nr) {
3363 case 0:
3364 case 2 ... 4:
3365 case 8:
3366 return true;
3367 default:
3368 return false;
3369 }
3370}
3371
3372static int check_cr_read(struct x86_emulate_ctxt *ctxt)
3373{
9dac77fa 3374 if (!valid_cr(ctxt->modrm_reg))
cfec82cb
JR		 3375 return emulate_ud(ctxt);
3376
3377 return X86EMUL_CONTINUE;
3378}
3379
3380static int check_cr_write(struct x86_emulate_ctxt *ctxt)
3381{
9dac77fa
AK		 3382 u64 new_val = ctxt->src.val64;
3383 int cr = ctxt->modrm_reg;
c2ad2bb3 3384 u64 efer = 0;
cfec82cb
JR		 3385
3386 static u64 cr_reserved_bits[] = {
3387 0xffffffff00000000ULL,
3388 0, 0, 0, /* CR3 checked later */
3389 CR4_RESERVED_BITS,
3390 0, 0, 0,
3391 CR8_RESERVED_BITS,
3392 };
3393
3394 if (!valid_cr(cr))
3395 return emulate_ud(ctxt);
3396
3397 if (new_val & cr_reserved_bits[cr])
3398 return emulate_gp(ctxt, 0);
3399
3400 switch (cr) {
3401 case 0: {
c2ad2bb3 3402 u64 cr4;
cfec82cb
JR		 3403 if (((new_val & X86_CR0_PG) && !(new_val & X86_CR0_PE)) ||
3404 ((new_val & X86_CR0_NW) && !(new_val & X86_CR0_CD)))
3405 return emulate_gp(ctxt, 0);
3406
717746e3
AK		 3407 cr4 = ctxt->ops->get_cr(ctxt, 4);
3408 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
cfec82cb
JR		 3409
3410 if ((new_val & X86_CR0_PG) && (efer & EFER_LME) &&
3411 !(cr4 & X86_CR4_PAE))
3412 return emulate_gp(ctxt, 0);
3413
3414 break;
3415 }
3416 case 3: {
3417 u64 rsvd = 0;
3418
c2ad2bb3
AK		 3419 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
3420 if (efer & EFER_LMA)
cfec82cb 3421 rsvd = CR3_L_MODE_RESERVED_BITS;
cfec82cb
JR		 3422
3423 if (new_val & rsvd)
3424 return emulate_gp(ctxt, 0);
3425
3426 break;
3427 }
3428 case 4: {
717746e3 3429 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
cfec82cb
JR		 3430
3431 if ((efer & EFER_LMA) && !(new_val & X86_CR4_PAE))
3432 return emulate_gp(ctxt, 0);
3433
3434 break;
3435 }
3436 }
3437
3438 return X86EMUL_CONTINUE;
3439}
3440
3b88e41a
JR		 3441static int check_dr7_gd(struct x86_emulate_ctxt *ctxt)
3442{
3443 unsigned long dr7;
3444
717746e3 3445 ctxt->ops->get_dr(ctxt, 7, &dr7);
3b88e41a
JR		 3446
3447 /* Check if DR7.Global_Enable is set */
3448 return dr7 & (1 << 13);
3449}
3450
3451static int check_dr_read(struct x86_emulate_ctxt *ctxt)
3452{
9dac77fa 3453 int dr = ctxt->modrm_reg;
3b88e41a
JR		 3454 u64 cr4;
3455
3456 if (dr > 7)
3457 return emulate_ud(ctxt);
3458
717746e3 3459 cr4 = ctxt->ops->get_cr(ctxt, 4);
3b88e41a
JR		 3460 if ((cr4 & X86_CR4_DE) && (dr == 4 || dr == 5))
3461 return emulate_ud(ctxt);
3462
3463 if (check_dr7_gd(ctxt))
3464 return emulate_db(ctxt);
3465
3466 return X86EMUL_CONTINUE;
3467}
3468
3469static int check_dr_write(struct x86_emulate_ctxt *ctxt)
3470{
9dac77fa
AK		 3471 u64 new_val = ctxt->src.val64;
3472 int dr = ctxt->modrm_reg;
3b88e41a
JR		 3473
3474 if ((dr == 6 || dr == 7) && (new_val & 0xffffffff00000000ULL))
3475 return emulate_gp(ctxt, 0);
3476
3477 return check_dr_read(ctxt);
3478}
3479
01de8b09
JR		 3480static int check_svme(struct x86_emulate_ctxt *ctxt)
3481{
3482 u64 efer;
3483
717746e3 3484 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
01de8b09
JR		 3485
3486 if (!(efer & EFER_SVME))
3487 return emulate_ud(ctxt);
3488
3489 return X86EMUL_CONTINUE;
3490}
3491
3492static int check_svme_pa(struct x86_emulate_ctxt *ctxt)
3493{
dd856efa 3494 u64 rax = reg_read(ctxt, VCPU_REGS_RAX);
01de8b09
JR		 3495
3496 /* Valid physical address? */
d4224449 3497 if (rax & 0xffff000000000000ULL)
01de8b09
JR		 3498 return emulate_gp(ctxt, 0);
3499
3500 return check_svme(ctxt);
3501}
3502
d7eb8203
JR		 3503static int check_rdtsc(struct x86_emulate_ctxt *ctxt)
3504{
717746e3 3505 u64 cr4 = ctxt->ops->get_cr(ctxt, 4);
d7eb8203 3506
717746e3 3507 if (cr4 & X86_CR4_TSD && ctxt->ops->cpl(ctxt))
d7eb8203
JR		 3508 return emulate_ud(ctxt);
3509
3510 return X86EMUL_CONTINUE;
3511}
3512
8061252e
JR		 3513static int check_rdpmc(struct x86_emulate_ctxt *ctxt)
3514{
717746e3 3515 u64 cr4 = ctxt->ops->get_cr(ctxt, 4);
dd856efa 3516 u64 rcx = reg_read(ctxt, VCPU_REGS_RCX);
8061252e 3517
717746e3 3518 if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt)) ||
67f4d428 3519 ctxt->ops->check_pmc(ctxt, rcx))
8061252e
JR		 3520 return emulate_gp(ctxt, 0);
3521
3522 return X86EMUL_CONTINUE;
3523}
3524
f6511935
JR		 3525static int check_perm_in(struct x86_emulate_ctxt *ctxt)
3526{
9dac77fa
AK		 3527 ctxt->dst.bytes = min(ctxt->dst.bytes, 4u);
3528 if (!emulator_io_permited(ctxt, ctxt->src.val, ctxt->dst.bytes))
f6511935
JR		 3529 return emulate_gp(ctxt, 0);
3530
3531 return X86EMUL_CONTINUE;
3532}
3533
3534static int check_perm_out(struct x86_emulate_ctxt *ctxt)
3535{
9dac77fa
AK		 3536 ctxt->src.bytes = min(ctxt->src.bytes, 4u);
3537 if (!emulator_io_permited(ctxt, ctxt->dst.val, ctxt->src.bytes))
f6511935
JR		 3538 return emulate_gp(ctxt, 0);
3539
3540 return X86EMUL_CONTINUE;
3541}
3542
73fba5f4 3543#define D(_y) { .flags = (_y) }
c4f035c6 3544#define DI(_y, _i) { .flags = (_y), .intercept = x86_intercept_##_i }
d09beabd
JR		 3545#define DIP(_y, _i, _p) { .flags = (_y), .intercept = x86_intercept_##_i, \
3546 .check_perm = (_p) }
0b789eee 3547#define N D(NotImpl)
01de8b09 3548#define EXT(_f, _e) { .flags = ((_f) | RMExt), .u.group = (_e) }
1c2545be
TY		 3549#define G(_f, _g) { .flags = ((_f) | Group | ModRM), .u.group = (_g) }
3550#define GD(_f, _g) { .flags = ((_f) | GroupDual | ModRM), .u.gdual = (_g) }
045a282c 3551#define E(_f, _e) { .flags = ((_f) | Escape | ModRM), .u.esc = (_e) }
73fba5f4 3552#define I(_f, _e) { .flags = (_f), .u.execute = (_e) }
e28bbd44 3553#define F(_f, _e) { .flags = (_f) | Fastop, .u.fastop = (_e) }
c4f035c6
AK		 3554#define II(_f, _e, _i) \
3555 { .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i }
d09beabd
JR		 3556#define IIP(_f, _e, _i, _p) \
3557 { .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i, \
3558 .check_perm = (_p) }
aa97bb48 3559#define GP(_f, _g) { .flags = ((_f) | Prefix), .u.gprefix = (_g) }
73fba5f4 3560
8d8f4e9f 3561#define D2bv(_f) D((_f) | ByteOp), D(_f)
f6511935 3562#define D2bvIP(_f, _i, _p) DIP((_f) | ByteOp, _i, _p), DIP(_f, _i, _p)
8d8f4e9f 3563#define I2bv(_f, _e) I((_f) | ByteOp, _e), I(_f, _e)
f7857f35 3564#define F2bv(_f, _e) F((_f) | ByteOp, _e), F(_f, _e)
d7841a4b
TY		 3565#define I2bvIP(_f, _e, _i, _p) \
3566 IIP((_f) | ByteOp, _e, _i, _p), IIP(_f, _e, _i, _p)
8d8f4e9f 3567
fb864fbc
AK		 3568#define F6ALU(_f, _e) F2bv((_f) | DstMem | SrcReg | ModRM, _e), \
3569 F2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock, _e), \
3570 F2bv(((_f) & ~Lock) | DstAcc | SrcImm, _e)
6230f7fc 3571
fd0a0d82 3572static const struct opcode group7_rm1[] = {
1c2545be
TY		 3573 DI(SrcNone | Priv, monitor),
3574 DI(SrcNone | Priv, mwait),
d7eb8203
JR		 3575 N, N, N, N, N, N,
3576};
3577
fd0a0d82 3578static const struct opcode group7_rm3[] = {
1c2545be 3579 DIP(SrcNone | Prot | Priv, vmrun, check_svme_pa),
b51e974f 3580 II(SrcNone | Prot | EmulateOnUD, em_vmmcall, vmmcall),
1c2545be
TY		 3581 DIP(SrcNone | Prot | Priv, vmload, check_svme_pa),
3582 DIP(SrcNone | Prot | Priv, vmsave, check_svme_pa),
3583 DIP(SrcNone | Prot | Priv, stgi, check_svme),
3584 DIP(SrcNone | Prot | Priv, clgi, check_svme),
3585 DIP(SrcNone | Prot | Priv, skinit, check_svme),
3586 DIP(SrcNone | Prot | Priv, invlpga, check_svme),
01de8b09 3587};
6230f7fc 3588
fd0a0d82 3589static const struct opcode group7_rm7[] = {
d7eb8203 3590 N,
1c2545be 3591 DIP(SrcNone, rdtscp, check_rdtsc),
d7eb8203
JR		 3592 N, N, N, N, N, N,
3593};
d67fc27a 3594
fd0a0d82 3595static const struct opcode group1[] = {
fb864fbc
AK		 3596 F(Lock, em_add),
3597 F(Lock | PageTable, em_or),
3598 F(Lock, em_adc),
3599 F(Lock, em_sbb),
3600 F(Lock | PageTable, em_and),
3601 F(Lock, em_sub),
3602 F(Lock, em_xor),
3603 F(NoWrite, em_cmp),
73fba5f4
AK		 3604};
3605
fd0a0d82 3606static const struct opcode group1A[] = {
1c2545be 3607 I(DstMem | SrcNone | Mov | Stack, em_pop), N, N, N, N, N, N, N,
73fba5f4
AK		 3608};
3609
007a3b54
AK		 3610static const struct opcode group2[] = {
3611 F(DstMem | ModRM, em_rol),
3612 F(DstMem | ModRM, em_ror),
3613 F(DstMem | ModRM, em_rcl),
3614 F(DstMem | ModRM, em_rcr),
3615 F(DstMem | ModRM, em_shl),
3616 F(DstMem | ModRM, em_shr),
3617 F(DstMem | ModRM, em_shl),
3618 F(DstMem | ModRM, em_sar),
3619};
3620
fd0a0d82 3621static const struct opcode group3[] = {
fb864fbc
AK		 3622 F(DstMem | SrcImm | NoWrite, em_test),
3623 F(DstMem | SrcImm | NoWrite, em_test),
45a1467d
AK		 3624 F(DstMem | SrcNone | Lock, em_not),
3625 F(DstMem | SrcNone | Lock, em_neg),
b9fa409b
AK		 3626 F(DstXacc | Src2Mem, em_mul_ex),
3627 F(DstXacc | Src2Mem, em_imul_ex),
b8c0b6ae
AK		 3628 F(DstXacc | Src2Mem, em_div_ex),
3629 F(DstXacc | Src2Mem, em_idiv_ex),
73fba5f4
AK		 3630};
3631
fd0a0d82 3632static const struct opcode group4[] = {
95413dc4
AK		 3633 F(ByteOp | DstMem | SrcNone | Lock, em_inc),
3634 F(ByteOp | DstMem | SrcNone | Lock, em_dec),
73fba5f4
AK		 3635 N, N, N, N, N, N,
3636};
3637
fd0a0d82 3638static const struct opcode group5[] = {
95413dc4
AK		 3639 F(DstMem | SrcNone | Lock, em_inc),
3640 F(DstMem | SrcNone | Lock, em_dec),
1c2545be
TY		 3641 I(SrcMem | Stack, em_grp45),
3642 I(SrcMemFAddr | ImplicitOps | Stack, em_call_far),
3643 I(SrcMem | Stack, em_grp45),
3644 I(SrcMemFAddr | ImplicitOps, em_grp45),
188424ba 3645 I(SrcMem | Stack, em_grp45), D(Undefined),
73fba5f4
AK		 3646};
3647
fd0a0d82 3648static const struct opcode group6[] = {
1c2545be
TY		 3649 DI(Prot, sldt),
3650 DI(Prot, str),
a14e579f 3651 II(Prot | Priv | SrcMem16, em_lldt, lldt),
80890006 3652 II(Prot | Priv | SrcMem16, em_ltr, ltr),
dee6bb70
JR		 3653 N, N, N, N,
3654};
3655
fd0a0d82 3656static const struct group_dual group7 = { {
606b1c3e
NA		 3657 II(Mov | DstMem, em_sgdt, sgdt),
3658 II(Mov | DstMem, em_sidt, sidt),
1c2545be
TY		 3659 II(SrcMem | Priv, em_lgdt, lgdt),
3660 II(SrcMem | Priv, em_lidt, lidt),
3661 II(SrcNone | DstMem | Mov, em_smsw, smsw), N,
3662 II(SrcMem16 | Mov | Priv, em_lmsw, lmsw),
3663 II(SrcMem | ByteOp | Priv | NoAccess, em_invlpg, invlpg),
73fba5f4 3664}, {
b51e974f 3665 I(SrcNone | Priv | EmulateOnUD, em_vmcall),
5ef39c71 3666 EXT(0, group7_rm1),
01de8b09 3667 N, EXT(0, group7_rm3),
1c2545be
TY		 3668 II(SrcNone | DstMem | Mov, em_smsw, smsw), N,
3669 II(SrcMem16 | Mov | Priv, em_lmsw, lmsw),
3670 EXT(0, group7_rm7),
73fba5f4
AK		 3671} };
3672
fd0a0d82 3673static const struct opcode group8[] = {
73fba5f4 3674 N, N, N, N,
11c363ba
AK		 3675 F(DstMem | SrcImmByte | NoWrite, em_bt),
3676 F(DstMem | SrcImmByte | Lock | PageTable, em_bts),
3677 F(DstMem | SrcImmByte | Lock, em_btr),
3678 F(DstMem | SrcImmByte | Lock | PageTable, em_btc),
73fba5f4
AK		 3679};
3680
fd0a0d82 3681static const struct group_dual group9 = { {
1c2545be 3682 N, I(DstMem64 | Lock | PageTable, em_cmpxchg8b), N, N, N, N, N, N,
73fba5f4
AK		 3683}, {
3684 N, N, N, N, N, N, N, N,
3685} };
3686
fd0a0d82 3687static const struct opcode group11[] = {
1c2545be 3688 I(DstMem | SrcImm | Mov | PageTable, em_mov),
d5ae7ce8 3689 X7(D(Undefined)),
a4d4a7c1
AK		 3690};
3691
fd0a0d82 3692static const struct gprefix pfx_0f_6f_0f_7f = {
e5971755 3693 I(Mmx, em_mov), I(Sse | Aligned, em_mov), N, I(Sse | Unaligned, em_mov),
aa97bb48
AK		 3694};
3695
fd0a0d82 3696static const struct gprefix pfx_vmovntpx = {
3e114eb4
AK		 3697 I(0, em_mov), N, N, N,
3698};
3699
27ce8258 3700static const struct gprefix pfx_0f_28_0f_29 = {
6fec27d8 3701 I(Aligned, em_mov), I(Aligned, em_mov), N, N,
27ce8258
IM		 3702};
3703
045a282c
GN		 3704static const struct escape escape_d9 = { {
3705 N, N, N, N, N, N, N, I(DstMem, em_fnstcw),
3706}, {
3707 /* 0xC0 - 0xC7 */
3708 N, N, N, N, N, N, N, N,
3709 /* 0xC8 - 0xCF */
3710 N, N, N, N, N, N, N, N,
3711 /* 0xD0 - 0xC7 */
3712 N, N, N, N, N, N, N, N,
3713 /* 0xD8 - 0xDF */
3714 N, N, N, N, N, N, N, N,
3715 /* 0xE0 - 0xE7 */
3716 N, N, N, N, N, N, N, N,
3717 /* 0xE8 - 0xEF */
3718 N, N, N, N, N, N, N, N,
3719 /* 0xF0 - 0xF7 */
3720 N, N, N, N, N, N, N, N,
3721 /* 0xF8 - 0xFF */
3722 N, N, N, N, N, N, N, N,
3723} };
3724
3725static const struct escape escape_db = { {
3726 N, N, N, N, N, N, N, N,
3727}, {
3728 /* 0xC0 - 0xC7 */
3729 N, N, N, N, N, N, N, N,
3730 /* 0xC8 - 0xCF */
3731 N, N, N, N, N, N, N, N,
3732 /* 0xD0 - 0xC7 */
3733 N, N, N, N, N, N, N, N,
3734 /* 0xD8 - 0xDF */
3735 N, N, N, N, N, N, N, N,
3736 /* 0xE0 - 0xE7 */
3737 N, N, N, I(ImplicitOps, em_fninit), N, N, N, N,
3738 /* 0xE8 - 0xEF */
3739 N, N, N, N, N, N, N, N,
3740 /* 0xF0 - 0xF7 */
3741 N, N, N, N, N, N, N, N,
3742 /* 0xF8 - 0xFF */
3743 N, N, N, N, N, N, N, N,
3744} };
3745
3746static const struct escape escape_dd = { {
3747 N, N, N, N, N, N, N, I(DstMem, em_fnstsw),
3748}, {
3749 /* 0xC0 - 0xC7 */
3750 N, N, N, N, N, N, N, N,
3751 /* 0xC8 - 0xCF */
3752 N, N, N, N, N, N, N, N,
3753 /* 0xD0 - 0xC7 */
3754 N, N, N, N, N, N, N, N,
3755 /* 0xD8 - 0xDF */
3756 N, N, N, N, N, N, N, N,
3757 /* 0xE0 - 0xE7 */
3758 N, N, N, N, N, N, N, N,
3759 /* 0xE8 - 0xEF */
3760 N, N, N, N, N, N, N, N,
3761 /* 0xF0 - 0xF7 */
3762 N, N, N, N, N, N, N, N,
3763 /* 0xF8 - 0xFF */
3764 N, N, N, N, N, N, N, N,
3765} };
3766
fd0a0d82 3767static const struct opcode opcode_table[256] = {
73fba5f4 3768 /* 0x00 - 0x07 */
fb864fbc 3769 F6ALU(Lock, em_add),
1cd196ea
AK		 3770 I(ImplicitOps | Stack | No64 | Src2ES, em_push_sreg),
3771 I(ImplicitOps | Stack | No64 | Src2ES, em_pop_sreg),
73fba5f4 3772 /* 0x08 - 0x0F */
fb864fbc 3773 F6ALU(Lock | PageTable, em_or),
1cd196ea
AK		 3774 I(ImplicitOps | Stack | No64 | Src2CS, em_push_sreg),
3775 N,
73fba5f4 3776 /* 0x10 - 0x17 */
fb864fbc 3777 F6ALU(Lock, em_adc),
1cd196ea
AK		 3778 I(ImplicitOps | Stack | No64 | Src2SS, em_push_sreg),
3779 I(ImplicitOps | Stack | No64 | Src2SS, em_pop_sreg),
73fba5f4 3780 /* 0x18 - 0x1F */
fb864fbc 3781 F6ALU(Lock, em_sbb),
1cd196ea
AK		 3782 I(ImplicitOps | Stack | No64 | Src2DS, em_push_sreg),
3783 I(ImplicitOps | Stack | No64 | Src2DS, em_pop_sreg),
73fba5f4 3784 /* 0x20 - 0x27 */
fb864fbc 3785 F6ALU(Lock | PageTable, em_and), N, N,
73fba5f4 3786 /* 0x28 - 0x2F */
fb864fbc 3787 F6ALU(Lock, em_sub), N, I(ByteOp | DstAcc | No64, em_das),
73fba5f4 3788 /* 0x30 - 0x37 */
fb864fbc 3789 F6ALU(Lock, em_xor), N, N,
73fba5f4 3790 /* 0x38 - 0x3F */
fb864fbc 3791 F6ALU(NoWrite, em_cmp), N, N,
73fba5f4 3792 /* 0x40 - 0x4F */
95413dc4 3793 X8(F(DstReg, em_inc)), X8(F(DstReg, em_dec)),
73fba5f4 3794 /* 0x50 - 0x57 */
63540382 3795 X8(I(SrcReg | Stack, em_push)),
73fba5f4 3796 /* 0x58 - 0x5F */
c54fe504 3797 X8(I(DstReg | Stack, em_pop)),
73fba5f4 3798 /* 0x60 - 0x67 */
b96a7fad
TY		 3799 I(ImplicitOps | Stack | No64, em_pusha),
3800 I(ImplicitOps | Stack | No64, em_popa),
73fba5f4
AK		 3801 N, D(DstReg | SrcMem32 | ModRM | Mov) /* movsxd (x86/64) */ ,
3802 N, N, N, N,
3803 /* 0x68 - 0x6F */
d46164db
AK		 3804 I(SrcImm | Mov | Stack, em_push),
3805 I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op),
f3a1b9f4
AK		 3806 I(SrcImmByte | Mov | Stack, em_push),
3807 I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op),
b3356bf0 3808 I2bvIP(DstDI | SrcDX | Mov | String | Unaligned, em_in, ins, check_perm_in), /* insb, insw/insd */
2b5e97e1 3809 I2bvIP(SrcSI | DstDX | String, em_out, outs, check_perm_out), /* outsb, outsw/outsd */
73fba5f4
AK		 3810 /* 0x70 - 0x7F */
3811 X16(D(SrcImmByte)),
3812 /* 0x80 - 0x87 */
1c2545be
TY		 3813 G(ByteOp | DstMem | SrcImm, group1),
3814 G(DstMem | SrcImm, group1),
3815 G(ByteOp | DstMem | SrcImm | No64, group1),
3816 G(DstMem | SrcImmByte, group1),
fb864fbc 3817 F2bv(DstMem | SrcReg | ModRM | NoWrite, em_test),
d5ae7ce8 3818 I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_xchg),
73fba5f4 3819 /* 0x88 - 0x8F */
d5ae7ce8 3820 I2bv(DstMem | SrcReg | ModRM | Mov | PageTable, em_mov),
b9eac5f4 3821 I2bv(DstReg | SrcMem | ModRM | Mov, em_mov),
d5ae7ce8 3822 I(DstMem | SrcNone | ModRM | Mov | PageTable, em_mov_rm_sreg),
1bd5f469
TY		 3823 D(ModRM | SrcMem | NoAccess | DstReg),
3824 I(ImplicitOps | SrcMem16 | ModRM, em_mov_sreg_rm),
3825 G(0, group1A),
73fba5f4 3826 /* 0x90 - 0x97 */
bf608f88 3827 DI(SrcAcc | DstReg, pause), X7(D(SrcAcc | DstReg)),
73fba5f4 3828 /* 0x98 - 0x9F */
61429142 3829 D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd),
cc4feed5 3830 I(SrcImmFAddr | No64, em_call_far), N,
62aaa2f0 3831 II(ImplicitOps | Stack, em_pushf, pushf),
98f73630
PB		 3832 II(ImplicitOps | Stack, em_popf, popf),
3833 I(ImplicitOps, em_sahf), I(ImplicitOps, em_lahf),
73fba5f4 3834 /* 0xA0 - 0xA7 */
b9eac5f4 3835 I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),
d5ae7ce8 3836 I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov),
b9eac5f4 3837 I2bv(SrcSI | DstDI | Mov | String, em_mov),
fb864fbc 3838 F2bv(SrcSI | DstDI | String | NoWrite, em_cmp),
73fba5f4 3839 /* 0xA8 - 0xAF */
fb864fbc 3840 F2bv(DstAcc | SrcImm | NoWrite, em_test),
b9eac5f4
AK		 3841 I2bv(SrcAcc | DstDI | Mov | String, em_mov),
3842 I2bv(SrcSI | DstAcc | Mov | String, em_mov),
fb864fbc 3843 F2bv(SrcAcc | DstDI | String | NoWrite, em_cmp),
73fba5f4 3844 /* 0xB0 - 0xB7 */
b9eac5f4 3845 X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)),
73fba5f4 3846 /* 0xB8 - 0xBF */
5e2c6883 3847 X8(I(DstReg | SrcImm64 | Mov, em_mov)),
73fba5f4 3848 /* 0xC0 - 0xC7 */
007a3b54 3849 G(ByteOp | Src2ImmByte, group2), G(Src2ImmByte, group2),
40ece7c7 3850 I(ImplicitOps | Stack | SrcImmU16, em_ret_near_imm),
ebda02c2 3851 I(ImplicitOps | Stack, em_ret),
d4b4325f
AK		 3852 I(DstReg | SrcMemFAddr | ModRM | No64 | Src2ES, em_lseg),
3853 I(DstReg | SrcMemFAddr | ModRM | No64 | Src2DS, em_lseg),
a4d4a7c1 3854 G(ByteOp, group11), G(0, group11),
73fba5f4 3855 /* 0xC8 - 0xCF */
612e89f0 3856 I(Stack | SrcImmU16 | Src2ImmByte, em_enter), I(Stack, em_leave),
3261107e
BR		 3857 I(ImplicitOps | Stack | SrcImmU16, em_ret_far_imm),
3858 I(ImplicitOps | Stack, em_ret_far),
3c6e276f 3859 D(ImplicitOps), DI(SrcImmByte, intn),
db5b0762 3860 D(ImplicitOps | No64), II(ImplicitOps, em_iret, iret),
73fba5f4 3861 /* 0xD0 - 0xD7 */
007a3b54
AK		 3862 G(Src2One | ByteOp, group2), G(Src2One, group2),
3863 G(Src2CL | ByteOp, group2), G(Src2CL, group2),
a035d5c6 3864 I(DstAcc | SrcImmUByte | No64, em_aam),
326f578f
PB		 3865 I(DstAcc | SrcImmUByte | No64, em_aad),
3866 F(DstAcc | ByteOp | No64, em_salc),
7fa57952 3867 I(DstAcc | SrcXLat | ByteOp, em_mov),
73fba5f4 3868 /* 0xD8 - 0xDF */
045a282c 3869 N, E(0, &escape_d9), N, E(0, &escape_db), N, E(0, &escape_dd), N, N,
73fba5f4 3870 /* 0xE0 - 0xE7 */
d06e03ad
TY		 3871 X3(I(SrcImmByte, em_loop)),
3872 I(SrcImmByte, em_jcxz),
d7841a4b
TY		 3873 I2bvIP(SrcImmUByte | DstAcc, em_in, in, check_perm_in),
3874 I2bvIP(SrcAcc | DstImmUByte, em_out, out, check_perm_out),
73fba5f4 3875 /* 0xE8 - 0xEF */
d4ddafcd 3876 I(SrcImm | Stack, em_call), D(SrcImm | ImplicitOps),
db5b0762 3877 I(SrcImmFAddr | No64, em_jmp_far), D(SrcImmByte | ImplicitOps),
d7841a4b
TY		 3878 I2bvIP(SrcDX | DstAcc, em_in, in, check_perm_in),
3879 I2bvIP(SrcAcc | DstDX, em_out, out, check_perm_out),
73fba5f4 3880 /* 0xF0 - 0xF7 */
bf608f88 3881 N, DI(ImplicitOps, icebp), N, N,
3c6e276f
AK		 3882 DI(ImplicitOps | Priv, hlt), D(ImplicitOps),
3883 G(ByteOp, group3), G(0, group3),
73fba5f4 3884 /* 0xF8 - 0xFF */
f411e6cd
TY		 3885 D(ImplicitOps), D(ImplicitOps),
3886 I(ImplicitOps, em_cli), I(ImplicitOps, em_sti),
73fba5f4
AK		 3887 D(ImplicitOps), D(ImplicitOps), G(0, group4), G(0, group5),
3888};
3889
fd0a0d82 3890static const struct opcode twobyte_table[256] = {
73fba5f4 3891 /* 0x00 - 0x0F */
dee6bb70 3892 G(0, group6), GD(0, &group7), N, N,
b51e974f 3893 N, I(ImplicitOps | EmulateOnUD, em_syscall),
db5b0762 3894 II(ImplicitOps | Priv, em_clts, clts), N,
3c6e276f 3895 DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N,
73fba5f4
AK		 3896 N, D(ImplicitOps | ModRM), N, N,
3897 /* 0x10 - 0x1F */
103f98ea
PB		 3898 N, N, N, N, N, N, N, N,
3899 D(ImplicitOps | ModRM), N, N, N, N, N, N, D(ImplicitOps | ModRM),
73fba5f4 3900 /* 0x20 - 0x2F */
9b88ae99
NA		 3901 DIP(ModRM | DstMem | Priv | Op3264 | NoMod, cr_read, check_cr_read),
3902 DIP(ModRM | DstMem | Priv | Op3264 | NoMod, dr_read, check_dr_read),
3903 IIP(ModRM | SrcMem | Priv | Op3264 | NoMod, em_cr_write, cr_write,
3904 check_cr_write),
3905 IIP(ModRM | SrcMem | Priv | Op3264 | NoMod, em_dr_write, dr_write,
3906 check_dr_write),
73fba5f4 3907 N, N, N, N,
27ce8258
IM		 3908 GP(ModRM | DstReg | SrcMem | Mov | Sse, &pfx_0f_28_0f_29),
3909 GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_28_0f_29),
3910 N, GP(ModRM | DstMem | SrcReg | Sse | Mov | Aligned, &pfx_vmovntpx),
3e114eb4 3911 N, N, N, N,
73fba5f4 3912 /* 0x30 - 0x3F */
e1e210b0 3913 II(ImplicitOps | Priv, em_wrmsr, wrmsr),
8061252e 3914 IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc),
e1e210b0 3915 II(ImplicitOps | Priv, em_rdmsr, rdmsr),
222d21aa 3916 IIP(ImplicitOps, em_rdpmc, rdpmc, check_rdpmc),
b51e974f
BP		 3917 I(ImplicitOps | EmulateOnUD, em_sysenter),
3918 I(ImplicitOps | Priv | EmulateOnUD, em_sysexit),
d867162c 3919 N, N,
73fba5f4
AK		 3920 N, N, N, N, N, N, N, N,
3921 /* 0x40 - 0x4F */
3922 X16(D(DstReg | SrcMem | ModRM | Mov)),
3923 /* 0x50 - 0x5F */
3924 N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
3925 /* 0x60 - 0x6F */
aa97bb48
AK		 3926 N, N, N, N,
3927 N, N, N, N,
3928 N, N, N, N,
3929 N, N, N, GP(SrcMem | DstReg | ModRM | Mov, &pfx_0f_6f_0f_7f),
73fba5f4 3930 /* 0x70 - 0x7F */
aa97bb48
AK		 3931 N, N, N, N,
3932 N, N, N, N,
3933 N, N, N, N,
3934 N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f),
73fba5f4
AK		 3935 /* 0x80 - 0x8F */
3936 X16(D(SrcImm)),
3937 /* 0x90 - 0x9F */
ee45b58e 3938 X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)),
73fba5f4 3939 /* 0xA0 - 0xA7 */
1cd196ea 3940 I(Stack | Src2FS, em_push_sreg), I(Stack | Src2FS, em_pop_sreg),
11c363ba
AK		 3941 II(ImplicitOps, em_cpuid, cpuid),
3942 F(DstMem | SrcReg | ModRM | BitOp | NoWrite, em_bt),
0bdea068
AK		 3943 F(DstMem | SrcReg | Src2ImmByte | ModRM, em_shld),
3944 F(DstMem | SrcReg | Src2CL | ModRM, em_shld), N, N,
73fba5f4 3945 /* 0xA8 - 0xAF */
1cd196ea 3946 I(Stack | Src2GS, em_push_sreg), I(Stack | Src2GS, em_pop_sreg),
d5ae7ce8 3947 DI(ImplicitOps, rsm),
11c363ba 3948 F(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_bts),
0bdea068
AK		 3949 F(DstMem | SrcReg | Src2ImmByte | ModRM, em_shrd),
3950 F(DstMem | SrcReg | Src2CL | ModRM, em_shrd),
4d758349 3951 D(ModRM), F(DstReg | SrcMem | ModRM, em_imul),
73fba5f4 3952 /* 0xB0 - 0xB7 */
e940b5c2 3953 I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_cmpxchg),
d4b4325f 3954 I(DstReg | SrcMemFAddr | ModRM | Src2SS, em_lseg),
11c363ba 3955 F(DstMem | SrcReg | ModRM | BitOp | Lock, em_btr),
d4b4325f
AK		 3956 I(DstReg | SrcMemFAddr | ModRM | Src2FS, em_lseg),
3957 I(DstReg | SrcMemFAddr | ModRM | Src2GS, em_lseg),
2adb5ad9 3958 D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
73fba5f4
AK		 3959 /* 0xB8 - 0xBF */
3960 N, N,
ce7faab2 3961 G(BitOp, group8),
11c363ba
AK		 3962 F(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc),
3963 F(DstReg | SrcMem | ModRM, em_bsf), F(DstReg | SrcMem | ModRM, em_bsr),
2adb5ad9 3964 D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
9299836e 3965 /* 0xC0 - 0xC7 */
e47a5f5f 3966 F2bv(DstMem | SrcReg | ModRM | SrcWrite | Lock, em_xadd),
92f738a5 3967 N, D(DstMem | SrcReg | ModRM | Mov),
73fba5f4 3968 N, N, N, GD(0, &group9),
9299836e
AK		 3969 /* 0xC8 - 0xCF */
3970 X8(I(DstReg, em_bswap)),
73fba5f4
AK		 3971 /* 0xD0 - 0xDF */
3972 N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
3973 /* 0xE0 - 0xEF */
3974 N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
3975 /* 0xF0 - 0xFF */
3976 N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N
3977};
3978
0bc5eedb 3979static const struct gprefix three_byte_0f_38_f0 = {
84cffe49 3980 I(DstReg | SrcMem | Mov, em_movbe), N, N, N
0bc5eedb
BP		 3981};
3982
3983static const struct gprefix three_byte_0f_38_f1 = {
84cffe49 3984 I(DstMem | SrcReg | Mov, em_movbe), N, N, N
0bc5eedb
BP		 3985};
3986
3987/*
3988 * Insns below are selected by the prefix which indexed by the third opcode
3989 * byte.
3990 */
3991static const struct opcode opcode_map_0f_38[256] = {
3992 /* 0x00 - 0x7f */
3993 X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N),
84cffe49
BP		 3994 /* 0x80 - 0xef */
3995 X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N),
3996 /* 0xf0 - 0xf1 */
3997 GP(EmulateOnUD | ModRM | Prefix, &three_byte_0f_38_f0),
3998 GP(EmulateOnUD | ModRM | Prefix, &three_byte_0f_38_f1),
3999 /* 0xf2 - 0xff */
4000 N, N, X4(N), X8(N)
0bc5eedb
BP		 4001};
4002
73fba5f4
AK		 4003#undef D
4004#undef N
4005#undef G
4006#undef GD
4007#undef I
aa97bb48 4008#undef GP
01de8b09 4009#undef EXT
73fba5f4 4010
8d8f4e9f 4011#undef D2bv
f6511935 4012#undef D2bvIP
8d8f4e9f 4013#undef I2bv
d7841a4b 4014#undef I2bvIP
d67fc27a 4015#undef I6ALU
8d8f4e9f 4016
9dac77fa 4017static unsigned imm_size(struct x86_emulate_ctxt *ctxt)
39f21ee5
AK		 4018{
4019 unsigned size;
4020
9dac77fa 4021 size = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
39f21ee5
AK		 4022 if (size == 8)
4023 size = 4;
4024 return size;
4025}
4026
4027static int decode_imm(struct x86_emulate_ctxt *ctxt, struct operand *op,
4028 unsigned size, bool sign_extension)
4029{
39f21ee5
AK		 4030 int rc = X86EMUL_CONTINUE;
4031
4032 op->type = OP_IMM;
4033 op->bytes = size;
9dac77fa 4034 op->addr.mem.ea = ctxt->_eip;
39f21ee5
AK		 4035 /* NB. Immediates are sign-extended as necessary. */
4036 switch (op->bytes) {
4037 case 1:
e85a1085 4038 op->val = insn_fetch(s8, ctxt);
39f21ee5
AK		 4039 break;
4040 case 2:
e85a1085 4041 op->val = insn_fetch(s16, ctxt);
39f21ee5
AK		 4042 break;
4043 case 4:
e85a1085 4044 op->val = insn_fetch(s32, ctxt);
39f21ee5 4045 break;
5e2c6883
NA		 4046 case 8:
4047 op->val = insn_fetch(s64, ctxt);
4048 break;
39f21ee5
AK		 4049 }
4050 if (!sign_extension) {
4051 switch (op->bytes) {
4052 case 1:
4053 op->val &= 0xff;
4054 break;
4055 case 2:
4056 op->val &= 0xffff;
4057 break;
4058 case 4:
4059 op->val &= 0xffffffff;
4060 break;
4061 }
4062 }
4063done:
4064 return rc;
4065}
4066
a9945549
AK		 4067static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
4068 unsigned d)
4069{
4070 int rc = X86EMUL_CONTINUE;
4071
4072 switch (d) {
4073 case OpReg:
2adb5ad9 4074 decode_register_operand(ctxt, op);
a9945549
AK		 4075 break;
4076 case OpImmUByte:
608aabe3 4077 rc = decode_imm(ctxt, op, 1, false);
a9945549
AK		 4078 break;
4079 case OpMem:
41ddf978 4080 ctxt->memop.bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
0fe59128
AK		 4081 mem_common:
4082 *op = ctxt->memop;
4083 ctxt->memopp = op;
96888977 4084 if (ctxt->d & BitOp)
a9945549
AK		 4085 fetch_bit_operand(ctxt);
4086 op->orig_val = op->val;
4087 break;
41ddf978 4088 case OpMem64:
aaa05f24 4089 ctxt->memop.bytes = (ctxt->op_bytes == 8) ? 16 : 8;
41ddf978 4090 goto mem_common;
a9945549
AK		 4091 case OpAcc:
4092 op->type = OP_REG;
4093 op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
dd856efa 4094 op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX);
a9945549
AK		 4095 fetch_register_operand(op);
4096 op->orig_val = op->val;
4097 break;
820207c8
AK		 4098 case OpAccLo:
4099 op->type = OP_REG;
4100 op->bytes = (ctxt->d & ByteOp) ? 2 : ctxt->op_bytes;
4101 op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX);
4102 fetch_register_operand(op);
4103 op->orig_val = op->val;
4104 break;
4105 case OpAccHi:
4106 if (ctxt->d & ByteOp) {
4107 op->type = OP_NONE;
4108 break;
4109 }
4110 op->type = OP_REG;
4111 op->bytes = ctxt->op_bytes;
4112 op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX);
4113 fetch_register_operand(op);
4114 op->orig_val = op->val;
4115 break;
a9945549
AK		 4116 case OpDI:
4117 op->type = OP_MEM;
4118 op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
4119 op->addr.mem.ea =
dd856efa 4120 register_address(ctxt, reg_read(ctxt, VCPU_REGS_RDI));
a9945549
AK		 4121 op->addr.mem.seg = VCPU_SREG_ES;
4122 op->val = 0;
b3356bf0 4123 op->count = 1;
a9945549
AK		 4124 break;
4125 case OpDX:
4126 op->type = OP_REG;
4127 op->bytes = 2;
dd856efa 4128 op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX);
a9945549
AK		 4129 fetch_register_operand(op);
4130 break;
4dd6a57d
AK		 4131 case OpCL:
4132 op->bytes = 1;
dd856efa 4133 op->val = reg_read(ctxt, VCPU_REGS_RCX) & 0xff;
4dd6a57d
AK		 4134 break;
4135 case OpImmByte:
4136 rc = decode_imm(ctxt, op, 1, true);
4137 break;
4138 case OpOne:
4139 op->bytes = 1;
4140 op->val = 1;
4141 break;
4142 case OpImm:
4143 rc = decode_imm(ctxt, op, imm_size(ctxt), true);
4144 break;
5e2c6883
NA		 4145 case OpImm64:
4146 rc = decode_imm(ctxt, op, ctxt->op_bytes, true);
4147 break;
28867cee
AK		 4148 case OpMem8:
4149 ctxt->memop.bytes = 1;
660696d1 4150 if (ctxt->memop.type == OP_REG) {
aa9ac1a6
GN		 4151 ctxt->memop.addr.reg = decode_register(ctxt,
4152 ctxt->modrm_rm, true);
660696d1
GN		 4153 fetch_register_operand(&ctxt->memop);
4154 }
28867cee 4155 goto mem_common;
0fe59128
AK		 4156 case OpMem16:
4157 ctxt->memop.bytes = 2;
4158 goto mem_common;
4159 case OpMem32:
4160 ctxt->memop.bytes = 4;
4161 goto mem_common;
4162 case OpImmU16:
4163 rc = decode_imm(ctxt, op, 2, false);
4164 break;
4165 case OpImmU:
4166 rc = decode_imm(ctxt, op, imm_size(ctxt), false);
4167 break;
4168 case OpSI:
4169 op->type = OP_MEM;
4170 op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
4171 op->addr.mem.ea =
dd856efa 4172 register_address(ctxt, reg_read(ctxt, VCPU_REGS_RSI));
0fe59128
AK		 4173 op->addr.mem.seg = seg_override(ctxt);
4174 op->val = 0;
b3356bf0 4175 op->count = 1;
0fe59128 4176 break;
7fa57952
PB		 4177 case OpXLat:
4178 op->type = OP_MEM;
4179 op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
4180 op->addr.mem.ea =
4181 register_address(ctxt,
4182 reg_read(ctxt, VCPU_REGS_RBX) +
4183 (reg_read(ctxt, VCPU_REGS_RAX) & 0xff));
4184 op->addr.mem.seg = seg_override(ctxt);
4185 op->val = 0;
4186 break;
0fe59128
AK		 4187 case OpImmFAddr:
4188 op->type = OP_IMM;
4189 op->addr.mem.ea = ctxt->_eip;
4190 op->bytes = ctxt->op_bytes + 2;
4191 insn_fetch_arr(op->valptr, op->bytes, ctxt);
4192 break;
4193 case OpMemFAddr:
4194 ctxt->memop.bytes = ctxt->op_bytes + 2;
4195 goto mem_common;
c191a7a0
AK		 4196 case OpES:
4197 op->val = VCPU_SREG_ES;
4198 break;
4199 case OpCS:
4200 op->val = VCPU_SREG_CS;
4201 break;
4202 case OpSS:
4203 op->val = VCPU_SREG_SS;
4204 break;
4205 case OpDS:
4206 op->val = VCPU_SREG_DS;
4207 break;
4208 case OpFS:
4209 op->val = VCPU_SREG_FS;
4210 break;
4211 case OpGS:
4212 op->val = VCPU_SREG_GS;
4213 break;
a9945549
AK		 4214 case OpImplicit:
4215 /* Special instructions do their own operand decoding. */
4216 default:
4217 op->type = OP_NONE; /* Disable writeback. */
4218 break;
4219 }
4220
4221done:
4222 return rc;
4223}
4224
ef5d75cc 4225int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
dde7e6d1 4226{
dde7e6d1
AK		 4227 int rc = X86EMUL_CONTINUE;
4228 int mode = ctxt->mode;
46561646 4229 int def_op_bytes, def_ad_bytes, goffset, simd_prefix;
0d7cdee8 4230 bool op_prefix = false;
46561646 4231 struct opcode opcode;
dde7e6d1 4232
f09ed83e
AK		 4233 ctxt->memop.type = OP_NONE;
4234 ctxt->memopp = NULL;
9dac77fa
AK		 4235 ctxt->_eip = ctxt->eip;
4236 ctxt->fetch.start = ctxt->_eip;
4237 ctxt->fetch.end = ctxt->fetch.start + insn_len;
1ce19dc1 4238 ctxt->opcode_len = 1;
dc25e89e 4239 if (insn_len > 0)
9dac77fa 4240 memcpy(ctxt->fetch.data, insn, insn_len);
dde7e6d1
AK		 4241
4242 switch (mode) {
4243 case X86EMUL_MODE_REAL:
4244 case X86EMUL_MODE_VM86:
4245 case X86EMUL_MODE_PROT16:
4246 def_op_bytes = def_ad_bytes = 2;
4247 break;
4248 case X86EMUL_MODE_PROT32:
4249 def_op_bytes = def_ad_bytes = 4;
4250 break;
4251#ifdef CONFIG_X86_64
4252 case X86EMUL_MODE_PROT64:
4253 def_op_bytes = 4;
4254 def_ad_bytes = 8;
4255 break;
4256#endif
4257 default:
1d2887e2 4258 return EMULATION_FAILED;
dde7e6d1
AK		 4259 }
4260
9dac77fa
AK		 4261 ctxt->op_bytes = def_op_bytes;
4262 ctxt->ad_bytes = def_ad_bytes;
dde7e6d1
AK		 4263
4264 /* Legacy prefixes. */
4265 for (;;) {
e85a1085 4266 switch (ctxt->b = insn_fetch(u8, ctxt)) {
dde7e6d1 4267 case 0x66: /* operand-size override */
0d7cdee8 4268 op_prefix = true;
dde7e6d1 4269 /* switch between 2/4 bytes */
9dac77fa 4270 ctxt->op_bytes = def_op_bytes ^ 6;
dde7e6d1
AK		 4271 break;
4272 case 0x67: /* address-size override */
4273 if (mode == X86EMUL_MODE_PROT64)
4274 /* switch between 4/8 bytes */
9dac77fa 4275 ctxt->ad_bytes = def_ad_bytes ^ 12;
dde7e6d1
AK		 4276 else
4277 /* switch between 2/4 bytes */
9dac77fa 4278 ctxt->ad_bytes = def_ad_bytes ^ 6;
dde7e6d1
AK		 4279 break;
4280 case 0x26: /* ES override */
4281 case 0x2e: /* CS override */
4282 case 0x36: /* SS override */
4283 case 0x3e: /* DS override */
9dac77fa 4284 set_seg_override(ctxt, (ctxt->b >> 3) & 3);
dde7e6d1
AK		 4285 break;
4286 case 0x64: /* FS override */
4287 case 0x65: /* GS override */
9dac77fa 4288 set_seg_override(ctxt, ctxt->b & 7);
dde7e6d1
AK		 4289 break;
4290 case 0x40 ... 0x4f: /* REX */
4291 if (mode != X86EMUL_MODE_PROT64)
4292 goto done_prefixes;
9dac77fa 4293 ctxt->rex_prefix = ctxt->b;
dde7e6d1
AK		 4294 continue;
4295 case 0xf0: /* LOCK */
9dac77fa 4296 ctxt->lock_prefix = 1;
dde7e6d1
AK		 4297 break;
4298 case 0xf2: /* REPNE/REPNZ */
dde7e6d1 4299 case 0xf3: /* REP/REPE/REPZ */
9dac77fa 4300 ctxt->rep_prefix = ctxt->b;
dde7e6d1
AK		 4301 break;
4302 default:
4303 goto done_prefixes;
4304 }
4305
4306 /* Any legacy prefix after a REX prefix nullifies its effect. */
4307
9dac77fa 4308 ctxt->rex_prefix = 0;
dde7e6d1
AK		 4309 }
4310
4311done_prefixes:
4312
4313 /* REX prefix. */
9dac77fa
AK		 4314 if (ctxt->rex_prefix & 8)
4315 ctxt->op_bytes = 8; /* REX.W */
dde7e6d1
AK		 4316
4317 /* Opcode byte(s). */
9dac77fa 4318 opcode = opcode_table[ctxt->b];
d3ad6243 4319 /* Two-byte opcode? */
9dac77fa 4320 if (ctxt->b == 0x0f) {
1ce19dc1 4321 ctxt->opcode_len = 2;
e85a1085 4322 ctxt->b = insn_fetch(u8, ctxt);
9dac77fa 4323 opcode = twobyte_table[ctxt->b];
0bc5eedb
BP		 4324
4325 /* 0F_38 opcode map */
4326 if (ctxt->b == 0x38) {
4327 ctxt->opcode_len = 3;
4328 ctxt->b = insn_fetch(u8, ctxt);
4329 opcode = opcode_map_0f_38[ctxt->b];
4330 }
dde7e6d1 4331 }
9dac77fa 4332 ctxt->d = opcode.flags;
dde7e6d1 4333
9f4260e7
TY		 4334 if (ctxt->d & ModRM)
4335 ctxt->modrm = insn_fetch(u8, ctxt);
4336
7fe864dc
NA		 4337 /* vex-prefix instructions are not implemented */
4338 if (ctxt->opcode_len == 1 && (ctxt->b == 0xc5 || ctxt->b == 0xc4) &&
4339 (mode == X86EMUL_MODE_PROT64 ||
4340 (mode >= X86EMUL_MODE_PROT16 && (ctxt->modrm & 0x80)))) {
4341 ctxt->d = NotImpl;
4342 }
4343
9dac77fa
AK		 4344 while (ctxt->d & GroupMask) {
4345 switch (ctxt->d & GroupMask) {
46561646 4346 case Group:
9dac77fa 4347 goffset = (ctxt->modrm >> 3) & 7;
46561646
AK		 4348 opcode = opcode.u.group[goffset];
4349 break;
4350 case GroupDual:
9dac77fa
AK		 4351 goffset = (ctxt->modrm >> 3) & 7;
4352 if ((ctxt->modrm >> 6) == 3)
46561646
AK		 4353 opcode = opcode.u.gdual->mod3[goffset];
4354 else
4355 opcode = opcode.u.gdual->mod012[goffset];
4356 break;
4357 case RMExt:
9dac77fa 4358 goffset = ctxt->modrm & 7;
01de8b09 4359 opcode = opcode.u.group[goffset];
46561646
AK		 4360 break;
4361 case Prefix:
9dac77fa 4362 if (ctxt->rep_prefix && op_prefix)
1d2887e2 4363 return EMULATION_FAILED;
9dac77fa 4364 simd_prefix = op_prefix ? 0x66 : ctxt->rep_prefix;
46561646
AK		 4365 switch (simd_prefix) {
4366 case 0x00: opcode = opcode.u.gprefix->pfx_no; break;
4367 case 0x66: opcode = opcode.u.gprefix->pfx_66; break;
4368 case 0xf2: opcode = opcode.u.gprefix->pfx_f2; break;
4369 case 0xf3: opcode = opcode.u.gprefix->pfx_f3; break;
4370 }
4371 break;
045a282c
GN		 4372 case Escape:
4373 if (ctxt->modrm > 0xbf)
4374 opcode = opcode.u.esc->high[ctxt->modrm - 0xc0];
4375 else
4376 opcode = opcode.u.esc->op[(ctxt->modrm >> 3) & 7];
4377 break;
46561646 4378 default:
1d2887e2 4379 return EMULATION_FAILED;
0d7cdee8 4380 }
46561646 4381
b1ea50b2 4382 ctxt->d &= ~(u64)GroupMask;
9dac77fa 4383 ctxt->d |= opcode.flags;
0d7cdee8
AK		 4384 }
4385
9dac77fa
AK		 4386 ctxt->execute = opcode.u.execute;
4387 ctxt->check_perm = opcode.check_perm;
4388 ctxt->intercept = opcode.intercept;
dde7e6d1
AK		 4389
4390 /* Unrecognised? */
1146a78b 4391 if (ctxt->d == 0 || (ctxt->d & NotImpl))
1d2887e2 4392 return EMULATION_FAILED;
dde7e6d1 4393
b51e974f 4394 if (!(ctxt->d & EmulateOnUD) && ctxt->ud)
1d2887e2 4395 return EMULATION_FAILED;
d867162c 4396
9dac77fa
AK		 4397 if (mode == X86EMUL_MODE_PROT64 && (ctxt->d & Stack))
4398 ctxt->op_bytes = 8;
dde7e6d1 4399
9dac77fa 4400 if (ctxt->d & Op3264) {
7f9b4b75 4401 if (mode == X86EMUL_MODE_PROT64)
9dac77fa 4402 ctxt->op_bytes = 8;
7f9b4b75 4403 else
9dac77fa 4404 ctxt->op_bytes = 4;
7f9b4b75
AK		 4405 }
4406
9dac77fa
AK		 4407 if (ctxt->d & Sse)
4408 ctxt->op_bytes = 16;
cbe2c9d3
AK		 4409 else if (ctxt->d & Mmx)
4410 ctxt->op_bytes = 8;
1253791d 4411
dde7e6d1 4412 /* ModRM and SIB bytes. */
9dac77fa 4413 if (ctxt->d & ModRM) {
f09ed83e 4414 rc = decode_modrm(ctxt, &ctxt->memop);
9dac77fa
AK		 4415 if (!ctxt->has_seg_override)
4416 set_seg_override(ctxt, ctxt->modrm_seg);
4417 } else if (ctxt->d & MemAbs)
f09ed83e 4418 rc = decode_abs(ctxt, &ctxt->memop);
dde7e6d1
AK		 4419 if (rc != X86EMUL_CONTINUE)
4420 goto done;
4421
9dac77fa
AK		 4422 if (!ctxt->has_seg_override)
4423 set_seg_override(ctxt, VCPU_SREG_DS);
dde7e6d1 4424
f09ed83e 4425 ctxt->memop.addr.mem.seg = seg_override(ctxt);
dde7e6d1 4426
f09ed83e
AK		 4427 if (ctxt->memop.type == OP_MEM && ctxt->ad_bytes != 8)
4428 ctxt->memop.addr.mem.ea = (u32)ctxt->memop.addr.mem.ea;
dde7e6d1 4429
dde7e6d1
AK		 4430 /*
4431 * Decode and fetch the source operand: register, memory
4432 * or immediate.
4433 */
0fe59128 4434 rc = decode_operand(ctxt, &ctxt->src, (ctxt->d >> SrcShift) & OpMask);
39f21ee5
AK		 4435 if (rc != X86EMUL_CONTINUE)
4436 goto done;
4437
dde7e6d1
AK		 4438 /*
4439 * Decode and fetch the second source operand: register, memory
4440 * or immediate.
4441 */
4dd6a57d 4442 rc = decode_operand(ctxt, &ctxt->src2, (ctxt->d >> Src2Shift) & OpMask);
39f21ee5
AK		 4443 if (rc != X86EMUL_CONTINUE)
4444 goto done;
4445
dde7e6d1 4446 /* Decode and fetch the destination operand: register or memory. */
a9945549 4447 rc = decode_operand(ctxt, &ctxt->dst, (ctxt->d >> DstShift) & OpMask);
dde7e6d1
AK		 4448
4449done:
f09ed83e
AK		 4450 if (ctxt->memopp && ctxt->memopp->type == OP_MEM && ctxt->rip_relative)
4451 ctxt->memopp->addr.mem.ea += ctxt->_eip;
cb16c348 4452
1d2887e2 4453 return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK;
dde7e6d1
AK		 4454}
4455
1cb3f3ae
XG		 4456bool x86_page_table_writing_insn(struct x86_emulate_ctxt *ctxt)
4457{
4458 return ctxt->d & PageTable;
4459}
4460
3e2f65d5
GN		 4461static bool string_insn_completed(struct x86_emulate_ctxt *ctxt)
4462{
3e2f65d5
GN		 4463 /* The second termination condition only applies for REPE
4464 * and REPNE. Test if the repeat string operation prefix is
4465 * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
4466 * corresponding termination condition according to:
4467 * - if REPE/REPZ and ZF = 0 then done
4468 * - if REPNE/REPNZ and ZF = 1 then done
4469 */
9dac77fa
AK		 4470 if (((ctxt->b == 0xa6) || (ctxt->b == 0xa7) ||
4471 (ctxt->b == 0xae) || (ctxt->b == 0xaf))
4472 && (((ctxt->rep_prefix == REPE_PREFIX) &&
3e2f65d5 4473 ((ctxt->eflags & EFLG_ZF) == 0))
9dac77fa 4474 || ((ctxt->rep_prefix == REPNE_PREFIX) &&
3e2f65d5
GN		 4475 ((ctxt->eflags & EFLG_ZF) == EFLG_ZF))))
4476 return true;
4477
4478 return false;
4479}
4480
cbe2c9d3
AK		 4481static int flush_pending_x87_faults(struct x86_emulate_ctxt *ctxt)
4482{
4483 bool fault = false;
4484
4485 ctxt->ops->get_fpu(ctxt);
4486 asm volatile("1: fwait \n\t"
4487 "2: \n\t"
4488 ".pushsection .fixup,\"ax\" \n\t"
4489 "3: \n\t"
4490 "movb $1, %[fault] \n\t"
4491 "jmp 2b \n\t"
4492 ".popsection \n\t"
4493 _ASM_EXTABLE(1b, 3b)
38e8a2dd 4494 : [fault]"+qm"(fault));
cbe2c9d3
AK		 4495 ctxt->ops->put_fpu(ctxt);
4496
4497 if (unlikely(fault))
4498 return emulate_exception(ctxt, MF_VECTOR, 0, false);
4499
4500 return X86EMUL_CONTINUE;
4501}
4502
4503static void fetch_possible_mmx_operand(struct x86_emulate_ctxt *ctxt,
4504 struct operand *op)
4505{
4506 if (op->type == OP_MM)
4507 read_mmx_reg(ctxt, &op->mm_val, op->addr.mm);
4508}
4509
e28bbd44
AK		 4510static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *))
4511{
4512 ulong flags = (ctxt->eflags & EFLAGS_MASK) | X86_EFLAGS_IF;
b9fa409b
AK		 4513 if (!(ctxt->d & ByteOp))
4514 fop += __ffs(ctxt->dst.bytes) * FASTOP_SIZE;
e28bbd44 4515 asm("push %[flags]; popf; call *%[fastop]; pushf; pop %[flags]\n"
b8c0b6ae
AK		 4516 : "+a"(ctxt->dst.val), "+d"(ctxt->src.val), [flags]"+D"(flags),
4517 [fastop]"+S"(fop)
4518 : "c"(ctxt->src2.val));
e28bbd44 4519 ctxt->eflags = (ctxt->eflags & ~EFLAGS_MASK) | (flags & EFLAGS_MASK);
b8c0b6ae
AK		 4520 if (!fop) /* exception is returned in fop variable */
4521 return emulate_de(ctxt);
e28bbd44
AK		 4522 return X86EMUL_CONTINUE;
4523}
dd856efa 4524
7b105ca2 4525int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
8b4caf66 4526{
0225fb50 4527 const struct x86_emulate_ops *ops = ctxt->ops;
1b30eaa8 4528 int rc = X86EMUL_CONTINUE;
9dac77fa 4529 int saved_dst_type = ctxt->dst.type;
8b4caf66 4530
9dac77fa 4531 ctxt->mem_read.pos = 0;
310b5d30 4532
1146a78b
GN		 4533 if ((ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) ||
4534 (ctxt->d & Undefined)) {
35d3d4a1 4535 rc = emulate_ud(ctxt);
1161624f
GN		 4536 goto done;
4537 }
4538
d380a5e4 4539 /* LOCK prefix is allowed only with some instructions */
9dac77fa 4540 if (ctxt->lock_prefix && (!(ctxt->d & Lock) || ctxt->dst.type != OP_MEM)) {
35d3d4a1 4541 rc = emulate_ud(ctxt);
d380a5e4
GN		 4542 goto done;
4543 }
4544
9dac77fa 4545 if ((ctxt->d & SrcMask) == SrcMemFAddr && ctxt->src.type != OP_MEM) {
35d3d4a1 4546 rc = emulate_ud(ctxt);
081bca0e
AK		 4547 goto done;
4548 }
4549
cbe2c9d3
AK		 4550 if (((ctxt->d & (Sse|Mmx)) && ((ops->get_cr(ctxt, 0) & X86_CR0_EM)))
4551 || ((ctxt->d & Sse) && !(ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR))) {
1253791d
AK		 4552 rc = emulate_ud(ctxt);
4553 goto done;
4554 }
4555
cbe2c9d3 4556 if ((ctxt->d & (Sse|Mmx)) && (ops->get_cr(ctxt, 0) & X86_CR0_TS)) {
1253791d
AK		 4557 rc = emulate_nm(ctxt);
4558 goto done;
4559 }
4560
cbe2c9d3
AK		 4561 if (ctxt->d & Mmx) {
4562 rc = flush_pending_x87_faults(ctxt);
4563 if (rc != X86EMUL_CONTINUE)
4564 goto done;
4565 /*
4566 * Now that we know the fpu is exception safe, we can fetch
4567 * operands from it.
4568 */
4569 fetch_possible_mmx_operand(ctxt, &ctxt->src);
4570 fetch_possible_mmx_operand(ctxt, &ctxt->src2);
4571 if (!(ctxt->d & Mov))
4572 fetch_possible_mmx_operand(ctxt, &ctxt->dst);
4573 }
4574
9dac77fa
AK		 4575 if (unlikely(ctxt->guest_mode) && ctxt->intercept) {
4576 rc = emulator_check_intercept(ctxt, ctxt->intercept,
8a76d7f2 4577 X86_ICPT_PRE_EXCEPT);
c4f035c6
AK		 4578 if (rc != X86EMUL_CONTINUE)
4579 goto done;
4580 }
4581
e92805ac 4582 /* Privileged instruction can be executed only in CPL=0 */
9dac77fa 4583 if ((ctxt->d & Priv) && ops->cpl(ctxt)) {
35d3d4a1 4584 rc = emulate_gp(ctxt, 0);
e92805ac
GN		 4585 goto done;
4586 }
4587
8ea7d6ae 4588 /* Instruction can only be executed in protected mode */
9d1b39a9 4589 if ((ctxt->d & Prot) && ctxt->mode < X86EMUL_MODE_PROT16) {
8ea7d6ae
JR		 4590 rc = emulate_ud(ctxt);
4591 goto done;
4592 }
4593
d09beabd 4594 /* Do instruction specific permission checks */
9dac77fa
AK		 4595 if (ctxt->check_perm) {
4596 rc = ctxt->check_perm(ctxt);
d09beabd
JR		 4597 if (rc != X86EMUL_CONTINUE)
4598 goto done;
4599 }
4600
9dac77fa
AK		 4601 if (unlikely(ctxt->guest_mode) && ctxt->intercept) {
4602 rc = emulator_check_intercept(ctxt, ctxt->intercept,
8a76d7f2 4603 X86_ICPT_POST_EXCEPT);
c4f035c6
AK		 4604 if (rc != X86EMUL_CONTINUE)
4605 goto done;
4606 }
4607
9dac77fa 4608 if (ctxt->rep_prefix && (ctxt->d & String)) {
b9fa9d6b 4609 /* All REP prefixes have the same first termination condition */
dd856efa 4610 if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) {
9dac77fa 4611 ctxt->eip = ctxt->_eip;
b9fa9d6b
AK		 4612 goto done;
4613 }
b9fa9d6b
AK		 4614 }
4615
9dac77fa
AK		 4616 if ((ctxt->src.type == OP_MEM) && !(ctxt->d & NoAccess)) {
4617 rc = segmented_read(ctxt, ctxt->src.addr.mem,
4618 ctxt->src.valptr, ctxt->src.bytes);
b60d513c 4619 if (rc != X86EMUL_CONTINUE)
8b4caf66 4620 goto done;
9dac77fa 4621 ctxt->src.orig_val64 = ctxt->src.val64;
8b4caf66
LV		 4622 }
4623
9dac77fa
AK		 4624 if (ctxt->src2.type == OP_MEM) {
4625 rc = segmented_read(ctxt, ctxt->src2.addr.mem,
4626 &ctxt->src2.val, ctxt->src2.bytes);
e35b7b9c
GN		 4627 if (rc != X86EMUL_CONTINUE)
4628 goto done;
4629 }
4630
9dac77fa 4631 if ((ctxt->d & DstMask) == ImplicitOps)
8b4caf66
LV		 4632 goto special_insn;
4633
4634
9dac77fa 4635 if ((ctxt->dst.type == OP_MEM) && !(ctxt->d & Mov)) {
69f55cb1 4636 /* optimisation - avoid slow emulated read if Mov */
9dac77fa
AK		 4637 rc = segmented_read(ctxt, ctxt->dst.addr.mem,
4638 &ctxt->dst.val, ctxt->dst.bytes);
69f55cb1
GN		 4639 if (rc != X86EMUL_CONTINUE)
4640 goto done;
038e51de 4641 }
9dac77fa 4642 ctxt->dst.orig_val = ctxt->dst.val;
038e51de 4643
018a98db
AK		 4644special_insn:
4645
9dac77fa
AK		 4646 if (unlikely(ctxt->guest_mode) && ctxt->intercept) {
4647 rc = emulator_check_intercept(ctxt, ctxt->intercept,
8a76d7f2 4648 X86_ICPT_POST_MEMACCESS);
c4f035c6
AK		 4649 if (rc != X86EMUL_CONTINUE)
4650 goto done;
4651 }
4652
9dac77fa 4653 if (ctxt->execute) {
e28bbd44
AK		 4654 if (ctxt->d & Fastop) {
4655 void (*fop)(struct fastop *) = (void *)ctxt->execute;
4656 rc = fastop(ctxt, fop);
4657 if (rc != X86EMUL_CONTINUE)
4658 goto done;
4659 goto writeback;
4660 }
9dac77fa 4661 rc = ctxt->execute(ctxt);
ef65c889
AK		 4662 if (rc != X86EMUL_CONTINUE)
4663 goto done;
4664 goto writeback;
4665 }
4666
1ce19dc1 4667 if (ctxt->opcode_len == 2)
6aa8b732 4668 goto twobyte_insn;
0bc5eedb
BP		 4669 else if (ctxt->opcode_len == 3)
4670 goto threebyte_insn;
6aa8b732 4671
9dac77fa 4672 switch (ctxt->b) {
6aa8b732 4673 case 0x63: /* movsxd */
8b4caf66 4674 if (ctxt->mode != X86EMUL_MODE_PROT64)
6aa8b732 4675 goto cannot_emulate;
9dac77fa 4676 ctxt->dst.val = (s32) ctxt->src.val;
6aa8b732 4677 break;
b2833e3c 4678 case 0x70 ... 0x7f: /* jcc (short) */
9dac77fa
AK		 4679 if (test_cc(ctxt->b, ctxt->eflags))
4680 jmp_rel(ctxt, ctxt->src.val);
018a98db 4681 break;
7e0b54b1 4682 case 0x8d: /* lea r16/r32, m */
9dac77fa 4683 ctxt->dst.val = ctxt->src.addr.mem.ea;
7e0b54b1 4684 break;
3d9e77df 4685 case 0x90 ... 0x97: /* nop / xchg reg, rax */
dd856efa 4686 if (ctxt->dst.addr.reg == reg_rmw(ctxt, VCPU_REGS_RAX))
34698d8c 4687 break;
e4f973ae
TY		 4688 rc = em_xchg(ctxt);
4689 break;
e8b6fa70 4690 case 0x98: /* cbw/cwde/cdqe */
9dac77fa
AK		 4691 switch (ctxt->op_bytes) {
4692 case 2: ctxt->dst.val = (s8)ctxt->dst.val; break;
4693 case 4: ctxt->dst.val = (s16)ctxt->dst.val; break;
4694 case 8: ctxt->dst.val = (s32)ctxt->dst.val; break;
e8b6fa70
WY		 4695 }
4696 break;
6e154e56 4697 case 0xcc: /* int3 */
5c5df76b
TY		 4698 rc = emulate_int(ctxt, 3);
4699 break;
6e154e56 4700 case 0xcd: /* int n */
9dac77fa 4701 rc = emulate_int(ctxt, ctxt->src.val);
6e154e56
MG		 4702 break;
4703 case 0xce: /* into */
5c5df76b
TY		 4704 if (ctxt->eflags & EFLG_OF)
4705 rc = emulate_int(ctxt, 4);
6e154e56 4706 break;
1a52e051 4707 case 0xe9: /* jmp rel */
db5b0762 4708 case 0xeb: /* jmp rel short */
9dac77fa
AK		 4709 jmp_rel(ctxt, ctxt->src.val);
4710 ctxt->dst.type = OP_NONE; /* Disable writeback. */
1a52e051 4711 break;
111de5d6 4712 case 0xf4: /* hlt */
6c3287f7 4713 ctxt->ops->halt(ctxt);
19fdfa0d 4714 break;
111de5d6
AK		 4715 case 0xf5: /* cmc */
4716 /* complement carry flag from eflags reg */
4717 ctxt->eflags ^= EFLG_CF;
111de5d6
AK		 4718 break;
4719 case 0xf8: /* clc */
4720 ctxt->eflags &= ~EFLG_CF;
111de5d6 4721 break;
8744aa9a
MG		 4722 case 0xf9: /* stc */
4723 ctxt->eflags |= EFLG_CF;
4724 break;
fb4616f4
MG		 4725 case 0xfc: /* cld */
4726 ctxt->eflags &= ~EFLG_DF;
fb4616f4
MG		 4727 break;
4728 case 0xfd: /* std */
4729 ctxt->eflags |= EFLG_DF;
fb4616f4 4730 break;
91269b8f
AK		 4731 default:
4732 goto cannot_emulate;
6aa8b732 4733 }
018a98db 4734
7d9ddaed
AK		 4735 if (rc != X86EMUL_CONTINUE)
4736 goto done;
4737
018a98db 4738writeback:
fb32b1ed
AK		 4739 if (ctxt->d & SrcWrite) {
4740 BUG_ON(ctxt->src.type == OP_MEM || ctxt->src.type == OP_MEM_STR);
4741 rc = writeback(ctxt, &ctxt->src);
4742 if (rc != X86EMUL_CONTINUE)
4743 goto done;
4744 }
ee212297
NA		 4745 if (!(ctxt->d & NoWrite)) {
4746 rc = writeback(ctxt, &ctxt->dst);
4747 if (rc != X86EMUL_CONTINUE)
4748 goto done;
4749 }
018a98db 4750
5cd21917
GN		 4751 /*
4752 * restore dst type in case the decoding will be reused
4753 * (happens for string instruction )
4754 */
9dac77fa 4755 ctxt->dst.type = saved_dst_type;
5cd21917 4756
9dac77fa 4757 if ((ctxt->d & SrcMask) == SrcSI)
f3bd64c6 4758 string_addr_inc(ctxt, VCPU_REGS_RSI, &ctxt->src);
a682e354 4759
9dac77fa 4760 if ((ctxt->d & DstMask) == DstDI)
f3bd64c6 4761 string_addr_inc(ctxt, VCPU_REGS_RDI, &ctxt->dst);
d9271123 4762
9dac77fa 4763 if (ctxt->rep_prefix && (ctxt->d & String)) {
b3356bf0 4764 unsigned int count;
9dac77fa 4765 struct read_cache *r = &ctxt->io_read;
b3356bf0
GN		 4766 if ((ctxt->d & SrcMask) == SrcSI)
4767 count = ctxt->src.count;
4768 else
4769 count = ctxt->dst.count;
4770 register_address_increment(ctxt, reg_rmw(ctxt, VCPU_REGS_RCX),
4771 -count);
3e2f65d5 4772
d2ddd1c4
GN		 4773 if (!string_insn_completed(ctxt)) {
4774 /*
4775 * Re-enter guest when pio read ahead buffer is empty
4776 * or, if it is not used, after each 1024 iteration.
4777 */
dd856efa 4778 if ((r->end != 0 || reg_read(ctxt, VCPU_REGS_RCX) & 0x3ff) &&
d2ddd1c4
GN		 4779 (r->end == 0 || r->end != r->pos)) {
4780 /*
4781 * Reset read cache. Usually happens before
4782 * decode, but since instruction is restarted
4783 * we have to do it here.
4784 */
9dac77fa 4785 ctxt->mem_read.end = 0;
dd856efa 4786 writeback_registers(ctxt);
d2ddd1c4
GN		 4787 return EMULATION_RESTART;
4788 }
4789 goto done; /* skip rip writeback */
0fa6ccbd 4790 }
5cd21917 4791 }
d2ddd1c4 4792
9dac77fa 4793 ctxt->eip = ctxt->_eip;
018a98db
AK		 4794
4795done:
da9cb575
AK		 4796 if (rc == X86EMUL_PROPAGATE_FAULT)
4797 ctxt->have_exception = true;
775fde86
JR		 4798 if (rc == X86EMUL_INTERCEPTED)
4799 return EMULATION_INTERCEPTED;
4800
dd856efa
AK		 4801 if (rc == X86EMUL_CONTINUE)
4802 writeback_registers(ctxt);
4803
d2ddd1c4 4804 return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
6aa8b732
AK		 4805
4806twobyte_insn:
9dac77fa 4807 switch (ctxt->b) {
018a98db 4808 case 0x09: /* wbinvd */
cfb22375 4809 (ctxt->ops->wbinvd)(ctxt);
f5f48ee1
SY		 4810 break;
4811 case 0x08: /* invd */
018a98db
AK		 4812 case 0x0d: /* GrpP (prefetch) */
4813 case 0x18: /* Grp16 (prefetch/nop) */
103f98ea 4814 case 0x1f: /* nop */
018a98db
AK		 4815 break;
4816 case 0x20: /* mov cr, reg */
9dac77fa 4817 ctxt->dst.val = ops->get_cr(ctxt, ctxt->modrm_reg);
018a98db 4818 break;
6aa8b732 4819 case 0x21: /* mov from dr to reg */
9dac77fa 4820 ops->get_dr(ctxt, ctxt->modrm_reg, &ctxt->dst.val);
6aa8b732 4821 break;
6aa8b732 4822 case 0x40 ... 0x4f: /* cmov */
9dac77fa
AK		 4823 ctxt->dst.val = ctxt->dst.orig_val = ctxt->src.val;
4824 if (!test_cc(ctxt->b, ctxt->eflags))
4825 ctxt->dst.type = OP_NONE; /* no writeback */
6aa8b732 4826 break;
b2833e3c 4827 case 0x80 ... 0x8f: /* jnz rel, etc*/
9dac77fa
AK		 4828 if (test_cc(ctxt->b, ctxt->eflags))
4829 jmp_rel(ctxt, ctxt->src.val);
018a98db 4830 break;
ee45b58e 4831 case 0x90 ... 0x9f: /* setcc r/m8 */
9dac77fa 4832 ctxt->dst.val = test_cc(ctxt->b, ctxt->eflags);
ee45b58e 4833 break;
2a7c5b8b
GC		 4834 case 0xae: /* clflush */
4835 break;
6aa8b732 4836 case 0xb6 ... 0xb7: /* movzx */
9dac77fa 4837 ctxt->dst.bytes = ctxt->op_bytes;
361cad2b 4838 ctxt->dst.val = (ctxt->src.bytes == 1) ? (u8) ctxt->src.val
9dac77fa 4839 : (u16) ctxt->src.val;
6aa8b732 4840 break;
6aa8b732 4841 case 0xbe ... 0xbf: /* movsx */
9dac77fa 4842 ctxt->dst.bytes = ctxt->op_bytes;
361cad2b 4843 ctxt->dst.val = (ctxt->src.bytes == 1) ? (s8) ctxt->src.val :
9dac77fa 4844 (s16) ctxt->src.val;
6aa8b732 4845 break;
a012e65a 4846 case 0xc3: /* movnti */
9dac77fa 4847 ctxt->dst.bytes = ctxt->op_bytes;
3b32004a
NA		 4848 ctxt->dst.val = (ctxt->op_bytes == 8) ? (u64) ctxt->src.val :
4849 (u32) ctxt->src.val;
a012e65a 4850 break;
91269b8f
AK		 4851 default:
4852 goto cannot_emulate;
6aa8b732 4853 }
7d9ddaed 4854
0bc5eedb
BP		 4855threebyte_insn:
4856
7d9ddaed
AK		 4857 if (rc != X86EMUL_CONTINUE)
4858 goto done;
4859
6aa8b732
AK		 4860 goto writeback;
4861
4862cannot_emulate:
a0c0ab2f 4863 return EMULATION_FAILED;
6aa8b732 4864}
dd856efa
AK		 4865
4866void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt)
4867{
4868 invalidate_registers(ctxt);
4869}
4870
4871void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt)
4872{
4873 writeback_registers(ctxt);
4874}
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