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KVM: VMX: Allow vm86 virtualization of big real mode
[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>
6aa8b732 27
3eeb3288 28#include "x86.h"
38ba30ba 29#include "tss.h"
e99f0507 30
a9945549
AK		 31/*
32 * Operand types
33 */
b1ea50b2
AK		 34#define OpNone 0ull
35#define OpImplicit 1ull /* No generic decode */
36#define OpReg 2ull /* Register */
37#define OpMem 3ull /* Memory */
38#define OpAcc 4ull /* Accumulator: AL/AX/EAX/RAX */
39#define OpDI 5ull /* ES:DI/EDI/RDI */
40#define OpMem64 6ull /* Memory, 64-bit */
41#define OpImmUByte 7ull /* Zero-extended 8-bit immediate */
42#define OpDX 8ull /* DX register */
4dd6a57d
AK		 43#define OpCL 9ull /* CL register (for shifts) */
44#define OpImmByte 10ull /* 8-bit sign extended immediate */
45#define OpOne 11ull /* Implied 1 */
46#define OpImm 12ull /* Sign extended immediate */
0fe59128
AK		 47#define OpMem16 13ull /* Memory operand (16-bit). */
48#define OpMem32 14ull /* Memory operand (32-bit). */
49#define OpImmU 15ull /* Immediate operand, zero extended */
50#define OpSI 16ull /* SI/ESI/RSI */
51#define OpImmFAddr 17ull /* Immediate far address */
52#define OpMemFAddr 18ull /* Far address in memory */
53#define OpImmU16 19ull /* Immediate operand, 16 bits, zero extended */
c191a7a0
AK		 54#define OpES 20ull /* ES */
55#define OpCS 21ull /* CS */
56#define OpSS 22ull /* SS */
57#define OpDS 23ull /* DS */
58#define OpFS 24ull /* FS */
59#define OpGS 25ull /* GS */
28867cee 60#define OpMem8 26ull /* 8-bit zero extended memory operand */
0fe59128
AK		 61
62#define OpBits 5 /* Width of operand field */
b1ea50b2 63#define OpMask ((1ull << OpBits) - 1)
a9945549 64
6aa8b732
AK		 65/*
66 * Opcode effective-address decode tables.
67 * Note that we only emulate instructions that have at least one memory
68 * operand (excluding implicit stack references). We assume that stack
69 * references and instruction fetches will never occur in special memory
70 * areas that require emulation. So, for example, 'mov <imm>,<reg>' need
71 * not be handled.
72 */
73
74/* Operand sizes: 8-bit operands or specified/overridden size. */
ab85b12b 75#define ByteOp (1<<0) /* 8-bit operands. */
6aa8b732 76/* Destination operand type. */
a9945549
AK		 77#define DstShift 1
78#define ImplicitOps (OpImplicit << DstShift)
79#define DstReg (OpReg << DstShift)
80#define DstMem (OpMem << DstShift)
81#define DstAcc (OpAcc << DstShift)
82#define DstDI (OpDI << DstShift)
83#define DstMem64 (OpMem64 << DstShift)
84#define DstImmUByte (OpImmUByte << DstShift)
85#define DstDX (OpDX << DstShift)
86#define DstMask (OpMask << DstShift)
6aa8b732 87/* Source operand type. */
0fe59128
AK		 88#define SrcShift 6
89#define SrcNone (OpNone << SrcShift)
90#define SrcReg (OpReg << SrcShift)
91#define SrcMem (OpMem << SrcShift)
92#define SrcMem16 (OpMem16 << SrcShift)
93#define SrcMem32 (OpMem32 << SrcShift)
94#define SrcImm (OpImm << SrcShift)
95#define SrcImmByte (OpImmByte << SrcShift)
96#define SrcOne (OpOne << SrcShift)
97#define SrcImmUByte (OpImmUByte << SrcShift)
98#define SrcImmU (OpImmU << SrcShift)
99#define SrcSI (OpSI << SrcShift)
100#define SrcImmFAddr (OpImmFAddr << SrcShift)
101#define SrcMemFAddr (OpMemFAddr << SrcShift)
102#define SrcAcc (OpAcc << SrcShift)
103#define SrcImmU16 (OpImmU16 << SrcShift)
104#define SrcDX (OpDX << SrcShift)
28867cee 105#define SrcMem8 (OpMem8 << SrcShift)
0fe59128 106#define SrcMask (OpMask << SrcShift)
221192bd
MT		 107#define BitOp (1<<11)
108#define MemAbs (1<<12) /* Memory operand is absolute displacement */
109#define String (1<<13) /* String instruction (rep capable) */
110#define Stack (1<<14) /* Stack instruction (push/pop) */
111#define GroupMask (7<<15) /* Opcode uses one of the group mechanisms */
112#define Group (1<<15) /* Bits 3:5 of modrm byte extend opcode */
113#define GroupDual (2<<15) /* Alternate decoding of mod == 3 */
114#define Prefix (3<<15) /* Instruction varies with 66/f2/f3 prefix */
115#define RMExt (4<<15) /* Opcode extension in ModRM r/m if mod == 3 */
116#define Sse (1<<18) /* SSE Vector instruction */
20c29ff2
AK		 117/* Generic ModRM decode. */
118#define ModRM (1<<19)
119/* Destination is only written; never read. */
120#define Mov (1<<20)
d8769fed 121/* Misc flags */
8ea7d6ae 122#define Prot (1<<21) /* instruction generates #UD if not in prot-mode */
d867162c 123#define VendorSpecific (1<<22) /* Vendor specific instruction */
5a506b12 124#define NoAccess (1<<23) /* Don't access memory (lea/invlpg/verr etc) */
7f9b4b75 125#define Op3264 (1<<24) /* Operand is 64b in long mode, 32b otherwise */
047a4818 126#define Undefined (1<<25) /* No Such Instruction */
d380a5e4 127#define Lock (1<<26) /* lock prefix is allowed for the instruction */
e92805ac 128#define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */
d8769fed 129#define No64 (1<<28)
d5ae7ce8 130#define PageTable (1 << 29) /* instruction used to write page table */
0dc8d10f 131/* Source 2 operand type */
d5ae7ce8 132#define Src2Shift (30)
4dd6a57d
AK		 133#define Src2None (OpNone << Src2Shift)
134#define Src2CL (OpCL << Src2Shift)
135#define Src2ImmByte (OpImmByte << Src2Shift)
136#define Src2One (OpOne << Src2Shift)
137#define Src2Imm (OpImm << Src2Shift)
c191a7a0
AK		 138#define Src2ES (OpES << Src2Shift)
139#define Src2CS (OpCS << Src2Shift)
140#define Src2SS (OpSS << Src2Shift)
141#define Src2DS (OpDS << Src2Shift)
142#define Src2FS (OpFS << Src2Shift)
143#define Src2GS (OpGS << Src2Shift)
4dd6a57d 144#define Src2Mask (OpMask << Src2Shift)
cbe2c9d3 145#define Mmx ((u64)1 << 40) /* MMX Vector instruction */
1c11b376
AK		 146#define Aligned ((u64)1 << 41) /* Explicitly aligned (e.g. MOVDQA) */
147#define Unaligned ((u64)1 << 42) /* Explicitly unaligned (e.g. MOVDQU) */
148#define Avx ((u64)1 << 43) /* Advanced Vector Extensions */
6aa8b732 149
d0e53325
AK		 150#define X2(x...) x, x
151#define X3(x...) X2(x), x
152#define X4(x...) X2(x), X2(x)
153#define X5(x...) X4(x), x
154#define X6(x...) X4(x), X2(x)
155#define X7(x...) X4(x), X3(x)
156#define X8(x...) X4(x), X4(x)
157#define X16(x...) X8(x), X8(x)
83babbca 158
d65b1dee 159struct opcode {
b1ea50b2
AK		 160 u64 flags : 56;
161 u64 intercept : 8;
120df890 162 union {
ef65c889 163 int (*execute)(struct x86_emulate_ctxt *ctxt);
120df890
AK		 164 struct opcode *group;
165 struct group_dual *gdual;
0d7cdee8 166 struct gprefix *gprefix;
120df890 167 } u;
d09beabd 168 int (*check_perm)(struct x86_emulate_ctxt *ctxt);
120df890
AK		 169};
170
171struct group_dual {
172 struct opcode mod012[8];
173 struct opcode mod3[8];
d65b1dee
AK		 174};
175
0d7cdee8
AK		 176struct gprefix {
177 struct opcode pfx_no;
178 struct opcode pfx_66;
179 struct opcode pfx_f2;
180 struct opcode pfx_f3;
181};
182
6aa8b732 183/* EFLAGS bit definitions. */
d4c6a154
GN		 184#define EFLG_ID (1<<21)
185#define EFLG_VIP (1<<20)
186#define EFLG_VIF (1<<19)
187#define EFLG_AC (1<<18)
b1d86143
AP		 188#define EFLG_VM (1<<17)
189#define EFLG_RF (1<<16)
d4c6a154
GN		 190#define EFLG_IOPL (3<<12)
191#define EFLG_NT (1<<14)
6aa8b732
AK		 192#define EFLG_OF (1<<11)
193#define EFLG_DF (1<<10)
b1d86143 194#define EFLG_IF (1<<9)
d4c6a154 195#define EFLG_TF (1<<8)
6aa8b732
AK		 196#define EFLG_SF (1<<7)
197#define EFLG_ZF (1<<6)
198#define EFLG_AF (1<<4)
199#define EFLG_PF (1<<2)
200#define EFLG_CF (1<<0)
201
62bd430e
MG		 202#define EFLG_RESERVED_ZEROS_MASK 0xffc0802a
203#define EFLG_RESERVED_ONE_MASK 2
204
dd856efa
AK		 205static ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr)
206{
207 if (!(ctxt->regs_valid & (1 << nr))) {
208 ctxt->regs_valid |= 1 << nr;
209 ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr);
210 }
211 return ctxt->_regs[nr];
212}
213
214static ulong *reg_write(struct x86_emulate_ctxt *ctxt, unsigned nr)
215{
216 ctxt->regs_valid |= 1 << nr;
217 ctxt->regs_dirty |= 1 << nr;
218 return &ctxt->_regs[nr];
219}
220
221static ulong *reg_rmw(struct x86_emulate_ctxt *ctxt, unsigned nr)
222{
223 reg_read(ctxt, nr);
224 return reg_write(ctxt, nr);
225}
226
227static void writeback_registers(struct x86_emulate_ctxt *ctxt)
228{
229 unsigned reg;
230
231 for_each_set_bit(reg, (ulong *)&ctxt->regs_dirty, 16)
232 ctxt->ops->write_gpr(ctxt, reg, ctxt->_regs[reg]);
233}
234
235static void invalidate_registers(struct x86_emulate_ctxt *ctxt)
236{
237 ctxt->regs_dirty = 0;
238 ctxt->regs_valid = 0;
239}
240
6aa8b732
AK		 241/*
242 * Instruction emulation:
243 * Most instructions are emulated directly via a fragment of inline assembly
244 * code. This allows us to save/restore EFLAGS and thus very easily pick up
245 * any modified flags.
246 */
247
05b3e0c2 248#if defined(CONFIG_X86_64)
6aa8b732
AK		 249#define _LO32 "k" /* force 32-bit operand */
250#define _STK "%%rsp" /* stack pointer */
251#elif defined(__i386__)
252#define _LO32 "" /* force 32-bit operand */
253#define _STK "%%esp" /* stack pointer */
254#endif
255
256/*
257 * These EFLAGS bits are restored from saved value during emulation, and
258 * any changes are written back to the saved value after emulation.
259 */
260#define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF)
261
262/* Before executing instruction: restore necessary bits in EFLAGS. */
e934c9c1
AK		 263#define _PRE_EFLAGS(_sav, _msk, _tmp) \
264 /* EFLAGS = (_sav & _msk) | (EFLAGS & ~_msk); _sav &= ~_msk; */ \
265 "movl %"_sav",%"_LO32 _tmp"; " \
266 "push %"_tmp"; " \
267 "push %"_tmp"; " \
268 "movl %"_msk",%"_LO32 _tmp"; " \
269 "andl %"_LO32 _tmp",("_STK"); " \
270 "pushf; " \
271 "notl %"_LO32 _tmp"; " \
272 "andl %"_LO32 _tmp",("_STK"); " \
273 "andl %"_LO32 _tmp","__stringify(BITS_PER_LONG/4)"("_STK"); " \
274 "pop %"_tmp"; " \
275 "orl %"_LO32 _tmp",("_STK"); " \
276 "popf; " \
277 "pop %"_sav"; "
6aa8b732
AK		 278
279/* After executing instruction: write-back necessary bits in EFLAGS. */
280#define _POST_EFLAGS(_sav, _msk, _tmp) \
281 /* _sav |= EFLAGS & _msk; */ \
282 "pushf; " \
283 "pop %"_tmp"; " \
284 "andl %"_msk",%"_LO32 _tmp"; " \
285 "orl %"_LO32 _tmp",%"_sav"; "
286
dda96d8f
AK		 287#ifdef CONFIG_X86_64
288#define ON64(x) x
289#else
290#define ON64(x)
291#endif
292
a31b9cea 293#define ____emulate_2op(ctxt, _op, _x, _y, _suffix, _dsttype) \
6b7ad61f
AK		 294 do { \
295 __asm__ __volatile__ ( \
296 _PRE_EFLAGS("0", "4", "2") \
297 _op _suffix " %"_x"3,%1; " \
298 _POST_EFLAGS("0", "4", "2") \
a31b9cea
AK		 299 : "=m" ((ctxt)->eflags), \
300 "+q" (*(_dsttype*)&(ctxt)->dst.val), \
6b7ad61f 301 "=&r" (_tmp) \
a31b9cea 302 : _y ((ctxt)->src.val), "i" (EFLAGS_MASK)); \
f3fd92fb 303 } while (0)
6b7ad61f
AK		 304
305
6aa8b732 306/* Raw emulation: instruction has two explicit operands. */
a31b9cea 307#define __emulate_2op_nobyte(ctxt,_op,_wx,_wy,_lx,_ly,_qx,_qy) \
6b7ad61f
AK		 308 do { \
309 unsigned long _tmp; \
310 \
a31b9cea 311 switch ((ctxt)->dst.bytes) { \
6b7ad61f 312 case 2: \
a31b9cea 313 ____emulate_2op(ctxt,_op,_wx,_wy,"w",u16); \
6b7ad61f
AK		 314 break; \
315 case 4: \
a31b9cea 316 ____emulate_2op(ctxt,_op,_lx,_ly,"l",u32); \
6b7ad61f
AK		 317 break; \
318 case 8: \
a31b9cea 319 ON64(____emulate_2op(ctxt,_op,_qx,_qy,"q",u64)); \
6b7ad61f
AK		 320 break; \
321 } \
6aa8b732
AK		 322 } while (0)
323
a31b9cea 324#define __emulate_2op(ctxt,_op,_bx,_by,_wx,_wy,_lx,_ly,_qx,_qy) \
6aa8b732 325 do { \
6b7ad61f 326 unsigned long _tmp; \
a31b9cea 327 switch ((ctxt)->dst.bytes) { \
6aa8b732 328 case 1: \
a31b9cea 329 ____emulate_2op(ctxt,_op,_bx,_by,"b",u8); \
6aa8b732
AK		 330 break; \
331 default: \
a31b9cea 332 __emulate_2op_nobyte(ctxt, _op, \
6aa8b732
AK		 333 _wx, _wy, _lx, _ly, _qx, _qy); \
334 break; \
335 } \
336 } while (0)
337
338/* Source operand is byte-sized and may be restricted to just %cl. */
a31b9cea
AK		 339#define emulate_2op_SrcB(ctxt, _op) \
340 __emulate_2op(ctxt, _op, "b", "c", "b", "c", "b", "c", "b", "c")
6aa8b732
AK		 341
342/* Source operand is byte, word, long or quad sized. */
a31b9cea
AK		 343#define emulate_2op_SrcV(ctxt, _op) \
344 __emulate_2op(ctxt, _op, "b", "q", "w", "r", _LO32, "r", "", "r")
6aa8b732
AK		 345
346/* Source operand is word, long or quad sized. */
a31b9cea
AK		 347#define emulate_2op_SrcV_nobyte(ctxt, _op) \
348 __emulate_2op_nobyte(ctxt, _op, "w", "r", _LO32, "r", "", "r")
6aa8b732 349
d175226a 350/* Instruction has three operands and one operand is stored in ECX register */
29053a60 351#define __emulate_2op_cl(ctxt, _op, _suffix, _type) \
7295261c
AK		 352 do { \
353 unsigned long _tmp; \
761441b9
AK		 354 _type _clv = (ctxt)->src2.val; \
355 _type _srcv = (ctxt)->src.val; \
356 _type _dstv = (ctxt)->dst.val; \
7295261c
AK		 357 \
358 __asm__ __volatile__ ( \
359 _PRE_EFLAGS("0", "5", "2") \
360 _op _suffix " %4,%1 \n" \
361 _POST_EFLAGS("0", "5", "2") \
761441b9 362 : "=m" ((ctxt)->eflags), "+r" (_dstv), "=&r" (_tmp) \
7295261c
AK		 363 : "c" (_clv) , "r" (_srcv), "i" (EFLAGS_MASK) \
364 ); \
365 \
761441b9
AK		 366 (ctxt)->src2.val = (unsigned long) _clv; \
367 (ctxt)->src2.val = (unsigned long) _srcv; \
368 (ctxt)->dst.val = (unsigned long) _dstv; \
d175226a
GT		 369 } while (0)
370
761441b9 371#define emulate_2op_cl(ctxt, _op) \
7295261c 372 do { \
761441b9 373 switch ((ctxt)->dst.bytes) { \
7295261c 374 case 2: \
29053a60 375 __emulate_2op_cl(ctxt, _op, "w", u16); \
7295261c
AK		 376 break; \
377 case 4: \
29053a60 378 __emulate_2op_cl(ctxt, _op, "l", u32); \
7295261c
AK		 379 break; \
380 case 8: \
29053a60 381 ON64(__emulate_2op_cl(ctxt, _op, "q", ulong)); \
7295261c
AK		 382 break; \
383 } \
d175226a
GT		 384 } while (0)
385
d1eef45d 386#define __emulate_1op(ctxt, _op, _suffix) \
6aa8b732
AK		 387 do { \
388 unsigned long _tmp; \
389 \
dda96d8f
AK		 390 __asm__ __volatile__ ( \
391 _PRE_EFLAGS("0", "3", "2") \
392 _op _suffix " %1; " \
393 _POST_EFLAGS("0", "3", "2") \
d1eef45d 394 : "=m" ((ctxt)->eflags), "+m" ((ctxt)->dst.val), \
dda96d8f
AK		 395 "=&r" (_tmp) \
396 : "i" (EFLAGS_MASK)); \
397 } while (0)
398
399/* Instruction has only one explicit operand (no source operand). */
d1eef45d 400#define emulate_1op(ctxt, _op) \
dda96d8f 401 do { \
d1eef45d
AK		 402 switch ((ctxt)->dst.bytes) { \
403 case 1: __emulate_1op(ctxt, _op, "b"); break; \
404 case 2: __emulate_1op(ctxt, _op, "w"); break; \
405 case 4: __emulate_1op(ctxt, _op, "l"); break; \
406 case 8: ON64(__emulate_1op(ctxt, _op, "q")); break; \
6aa8b732
AK		 407 } \
408 } while (0)
409
e8f2b1d6 410#define __emulate_1op_rax_rdx(ctxt, _op, _suffix, _ex) \
f6b3597b
AK		 411 do { \
412 unsigned long _tmp; \
dd856efa
AK		 413 ulong *rax = reg_rmw((ctxt), VCPU_REGS_RAX); \
414 ulong *rdx = reg_rmw((ctxt), VCPU_REGS_RDX); \
f6b3597b
AK		 415 \
416 __asm__ __volatile__ ( \
417 _PRE_EFLAGS("0", "5", "1") \
418 "1: \n\t" \
419 _op _suffix " %6; " \
420 "2: \n\t" \
421 _POST_EFLAGS("0", "5", "1") \
422 ".pushsection .fixup,\"ax\" \n\t" \
423 "3: movb $1, %4 \n\t" \
424 "jmp 2b \n\t" \
425 ".popsection \n\t" \
426 _ASM_EXTABLE(1b, 3b) \
e8f2b1d6
AK		 427 : "=m" ((ctxt)->eflags), "=&r" (_tmp), \
428 "+a" (*rax), "+d" (*rdx), "+qm"(_ex) \
429 : "i" (EFLAGS_MASK), "m" ((ctxt)->src.val), \
430 "a" (*rax), "d" (*rdx)); \
f6b3597b
AK		 431 } while (0)
432
3f9f53b0 433/* instruction has only one source operand, destination is implicit (e.g. mul, div, imul, idiv) */
e8f2b1d6 434#define emulate_1op_rax_rdx(ctxt, _op, _ex) \
7295261c 435 do { \
e8f2b1d6 436 switch((ctxt)->src.bytes) { \
7295261c 437 case 1: \
e8f2b1d6 438 __emulate_1op_rax_rdx(ctxt, _op, "b", _ex); \
7295261c
AK		 439 break; \
440 case 2: \
e8f2b1d6 441 __emulate_1op_rax_rdx(ctxt, _op, "w", _ex); \
7295261c
AK		 442 break; \
443 case 4: \
e8f2b1d6 444 __emulate_1op_rax_rdx(ctxt, _op, "l", _ex); \
f6b3597b
AK		 445 break; \
446 case 8: ON64( \
e8f2b1d6 447 __emulate_1op_rax_rdx(ctxt, _op, "q", _ex)); \
f6b3597b
AK		 448 break; \
449 } \
450 } while (0)
451
8a76d7f2
JR		 452static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt,
453 enum x86_intercept intercept,
454 enum x86_intercept_stage stage)
455{
456 struct x86_instruction_info info = {
457 .intercept = intercept,
9dac77fa
AK		 458 .rep_prefix = ctxt->rep_prefix,
459 .modrm_mod = ctxt->modrm_mod,
460 .modrm_reg = ctxt->modrm_reg,
461 .modrm_rm = ctxt->modrm_rm,
462 .src_val = ctxt->src.val64,
463 .src_bytes = ctxt->src.bytes,
464 .dst_bytes = ctxt->dst.bytes,
465 .ad_bytes = ctxt->ad_bytes,
8a76d7f2
JR		 466 .next_rip = ctxt->eip,
467 };
468
2953538e 469 return ctxt->ops->intercept(ctxt, &info, stage);
8a76d7f2
JR		 470}
471
f47cfa31
AK		 472static void assign_masked(ulong *dest, ulong src, ulong mask)
473{
474 *dest = (*dest & ~mask) | (src & mask);
475}
476
9dac77fa 477static inline unsigned long ad_mask(struct x86_emulate_ctxt *ctxt)
ddcb2885 478{
9dac77fa 479 return (1UL << (ctxt->ad_bytes << 3)) - 1;
ddcb2885
HH		 480}
481
f47cfa31
AK		 482static ulong stack_mask(struct x86_emulate_ctxt *ctxt)
483{
484 u16 sel;
485 struct desc_struct ss;
486
487 if (ctxt->mode == X86EMUL_MODE_PROT64)
488 return ~0UL;
489 ctxt->ops->get_segment(ctxt, &sel, &ss, NULL, VCPU_SREG_SS);
490 return ~0U >> ((ss.d ^ 1) * 16); /* d=0: 0xffff; d=1: 0xffffffff */
491}
492
612e89f0
AK		 493static int stack_size(struct x86_emulate_ctxt *ctxt)
494{
495 return (__fls(stack_mask(ctxt)) + 1) >> 3;
496}
497
6aa8b732 498/* Access/update address held in a register, based on addressing mode. */
e4706772 499static inline unsigned long
9dac77fa 500address_mask(struct x86_emulate_ctxt *ctxt, unsigned long reg)
e4706772 501{
9dac77fa 502 if (ctxt->ad_bytes == sizeof(unsigned long))
e4706772
HH		 503 return reg;
504 else
9dac77fa 505 return reg & ad_mask(ctxt);
e4706772
HH		 506}
507
508static inline unsigned long
9dac77fa 509register_address(struct x86_emulate_ctxt *ctxt, unsigned long reg)
e4706772 510{
9dac77fa 511 return address_mask(ctxt, reg);
e4706772
HH		 512}
513
5ad105e5
AK		 514static void masked_increment(ulong *reg, ulong mask, int inc)
515{
516 assign_masked(reg, *reg + inc, mask);
517}
518
7a957275 519static inline void
9dac77fa 520register_address_increment(struct x86_emulate_ctxt *ctxt, unsigned long *reg, int inc)
7a957275 521{
5ad105e5
AK		 522 ulong mask;
523
9dac77fa 524 if (ctxt->ad_bytes == sizeof(unsigned long))
5ad105e5 525 mask = ~0UL;
7a957275 526 else
5ad105e5
AK		 527 mask = ad_mask(ctxt);
528 masked_increment(reg, mask, inc);
529}
530
531static void rsp_increment(struct x86_emulate_ctxt *ctxt, int inc)
532{
dd856efa 533 masked_increment(reg_rmw(ctxt, VCPU_REGS_RSP), stack_mask(ctxt), inc);
7a957275 534}
6aa8b732 535
9dac77fa 536static inline void jmp_rel(struct x86_emulate_ctxt *ctxt, int rel)
7a957275 537{
9dac77fa 538 register_address_increment(ctxt, &ctxt->_eip, rel);
7a957275 539}
098c937b 540
56697687
AK		 541static u32 desc_limit_scaled(struct desc_struct *desc)
542{
543 u32 limit = get_desc_limit(desc);
544
545 return desc->g ? (limit << 12) | 0xfff : limit;
546}
547
9dac77fa 548static void set_seg_override(struct x86_emulate_ctxt *ctxt, int seg)
7a5b56df 549{
9dac77fa
AK		 550 ctxt->has_seg_override = true;
551 ctxt->seg_override = seg;
7a5b56df
AK		 552}
553
7b105ca2 554static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg)
7a5b56df
AK		 555{
556 if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS)
557 return 0;
558
7b105ca2 559 return ctxt->ops->get_cached_segment_base(ctxt, seg);
7a5b56df
AK		 560}
561
9dac77fa 562static unsigned seg_override(struct x86_emulate_ctxt *ctxt)
7a5b56df 563{
9dac77fa 564 if (!ctxt->has_seg_override)
7a5b56df
AK		 565 return 0;
566
9dac77fa 567 return ctxt->seg_override;
7a5b56df
AK		 568}
569
35d3d4a1
AK		 570static int emulate_exception(struct x86_emulate_ctxt *ctxt, int vec,
571 u32 error, bool valid)
54b8486f 572{
da9cb575
AK		 573 ctxt->exception.vector = vec;
574 ctxt->exception.error_code = error;
575 ctxt->exception.error_code_valid = valid;
35d3d4a1 576 return X86EMUL_PROPAGATE_FAULT;
54b8486f
GN		 577}
578
3b88e41a
JR		 579static int emulate_db(struct x86_emulate_ctxt *ctxt)
580{
581 return emulate_exception(ctxt, DB_VECTOR, 0, false);
582}
583
35d3d4a1 584static int emulate_gp(struct x86_emulate_ctxt *ctxt, int err)
54b8486f 585{
35d3d4a1 586 return emulate_exception(ctxt, GP_VECTOR, err, true);
54b8486f
GN		 587}
588
618ff15d
AK		 589static int emulate_ss(struct x86_emulate_ctxt *ctxt, int err)
590{
591 return emulate_exception(ctxt, SS_VECTOR, err, true);
592}
593
35d3d4a1 594static int emulate_ud(struct x86_emulate_ctxt *ctxt)
54b8486f 595{
35d3d4a1 596 return emulate_exception(ctxt, UD_VECTOR, 0, false);
54b8486f
GN		 597}
598
35d3d4a1 599static int emulate_ts(struct x86_emulate_ctxt *ctxt, int err)
54b8486f 600{
35d3d4a1 601 return emulate_exception(ctxt, TS_VECTOR, err, true);
54b8486f
GN		 602}
603
34d1f490
AK		 604static int emulate_de(struct x86_emulate_ctxt *ctxt)
605{
35d3d4a1 606 return emulate_exception(ctxt, DE_VECTOR, 0, false);
34d1f490
AK		 607}
608
1253791d
AK		 609static int emulate_nm(struct x86_emulate_ctxt *ctxt)
610{
611 return emulate_exception(ctxt, NM_VECTOR, 0, false);
612}
613
1aa36616
AK		 614static u16 get_segment_selector(struct x86_emulate_ctxt *ctxt, unsigned seg)
615{
616 u16 selector;
617 struct desc_struct desc;
618
619 ctxt->ops->get_segment(ctxt, &selector, &desc, NULL, seg);
620 return selector;
621}
622
623static void set_segment_selector(struct x86_emulate_ctxt *ctxt, u16 selector,
624 unsigned seg)
625{
626 u16 dummy;
627 u32 base3;
628 struct desc_struct desc;
629
630 ctxt->ops->get_segment(ctxt, &dummy, &desc, &base3, seg);
631 ctxt->ops->set_segment(ctxt, selector, &desc, base3, seg);
632}
633
1c11b376
AK		 634/*
635 * x86 defines three classes of vector instructions: explicitly
636 * aligned, explicitly unaligned, and the rest, which change behaviour
637 * depending on whether they're AVX encoded or not.
638 *
639 * Also included is CMPXCHG16B which is not a vector instruction, yet it is
640 * subject to the same check.
641 */
642static bool insn_aligned(struct x86_emulate_ctxt *ctxt, unsigned size)
643{
644 if (likely(size < 16))
645 return false;
646
647 if (ctxt->d & Aligned)
648 return true;
649 else if (ctxt->d & Unaligned)
650 return false;
651 else if (ctxt->d & Avx)
652 return false;
653 else
654 return true;
655}
656
3d9b938e 657static int __linearize(struct x86_emulate_ctxt *ctxt,
52fd8b44 658 struct segmented_address addr,
3d9b938e 659 unsigned size, bool write, bool fetch,
52fd8b44
AK		 660 ulong *linear)
661{
618ff15d
AK		 662 struct desc_struct desc;
663 bool usable;
52fd8b44 664 ulong la;
618ff15d 665 u32 lim;
1aa36616 666 u16 sel;
618ff15d 667 unsigned cpl, rpl;
52fd8b44 668
7b105ca2 669 la = seg_base(ctxt, addr.seg) + addr.ea;
618ff15d
AK		 670 switch (ctxt->mode) {
671 case X86EMUL_MODE_REAL:
672 break;
673 case X86EMUL_MODE_PROT64:
674 if (((signed long)la << 16) >> 16 != la)
675 return emulate_gp(ctxt, 0);
676 break;
677 default:
1aa36616
AK		 678 usable = ctxt->ops->get_segment(ctxt, &sel, &desc, NULL,
679 addr.seg);
618ff15d
AK		 680 if (!usable)
681 goto bad;
682 /* code segment or read-only data segment */
683 if (((desc.type & 8) || !(desc.type & 2)) && write)
684 goto bad;
685 /* unreadable code segment */
3d9b938e 686 if (!fetch && (desc.type & 8) && !(desc.type & 2))
618ff15d
AK		 687 goto bad;
688 lim = desc_limit_scaled(&desc);
689 if ((desc.type & 8) || !(desc.type & 4)) {
690 /* expand-up segment */
691 if (addr.ea > lim || (u32)(addr.ea + size - 1) > lim)
692 goto bad;
693 } else {
fc058680 694 /* expand-down segment */
618ff15d
AK		 695 if (addr.ea <= lim || (u32)(addr.ea + size - 1) <= lim)
696 goto bad;
697 lim = desc.d ? 0xffffffff : 0xffff;
698 if (addr.ea > lim || (u32)(addr.ea + size - 1) > lim)
699 goto bad;
700 }
717746e3 701 cpl = ctxt->ops->cpl(ctxt);
1aa36616 702 rpl = sel & 3;
618ff15d
AK		 703 cpl = max(cpl, rpl);
704 if (!(desc.type & 8)) {
705 /* data segment */
706 if (cpl > desc.dpl)
707 goto bad;
708 } else if ((desc.type & 8) && !(desc.type & 4)) {
709 /* nonconforming code segment */
710 if (cpl != desc.dpl)
711 goto bad;
712 } else if ((desc.type & 8) && (desc.type & 4)) {
713 /* conforming code segment */
714 if (cpl < desc.dpl)
715 goto bad;
716 }
717 break;
718 }
9dac77fa 719 if (fetch ? ctxt->mode != X86EMUL_MODE_PROT64 : ctxt->ad_bytes != 8)
52fd8b44 720 la &= (u32)-1;
1c11b376
AK		 721 if (insn_aligned(ctxt, size) && ((la & (size - 1)) != 0))
722 return emulate_gp(ctxt, 0);
52fd8b44
AK		 723 *linear = la;
724 return X86EMUL_CONTINUE;
618ff15d
AK		 725bad:
726 if (addr.seg == VCPU_SREG_SS)
727 return emulate_ss(ctxt, addr.seg);
728 else
729 return emulate_gp(ctxt, addr.seg);
52fd8b44
AK		 730}
731
3d9b938e
NE		 732static int linearize(struct x86_emulate_ctxt *ctxt,
733 struct segmented_address addr,
734 unsigned size, bool write,
735 ulong *linear)
736{
737 return __linearize(ctxt, addr, size, write, false, linear);
738}
739
740
3ca3ac4d
AK		 741static int segmented_read_std(struct x86_emulate_ctxt *ctxt,
742 struct segmented_address addr,
743 void *data,
744 unsigned size)
745{
9fa088f4
AK		 746 int rc;
747 ulong linear;
748
83b8795a 749 rc = linearize(ctxt, addr, size, false, &linear);
9fa088f4
AK		 750 if (rc != X86EMUL_CONTINUE)
751 return rc;
0f65dd70 752 return ctxt->ops->read_std(ctxt, linear, data, size, &ctxt->exception);
3ca3ac4d
AK		 753}
754
807941b1
TY		 755/*
756 * Fetch the next byte of the instruction being emulated which is pointed to
757 * by ctxt->_eip, then increment ctxt->_eip.
758 *
759 * Also prefetch the remaining bytes of the instruction without crossing page
760 * boundary if they are not in fetch_cache yet.
761 */
762static int do_insn_fetch_byte(struct x86_emulate_ctxt *ctxt, u8 *dest)
62266869 763{
9dac77fa 764 struct fetch_cache *fc = &ctxt->fetch;
62266869 765 int rc;
2fb53ad8 766 int size, cur_size;
62266869 767
807941b1 768 if (ctxt->_eip == fc->end) {
3d9b938e 769 unsigned long linear;
807941b1
TY		 770 struct segmented_address addr = { .seg = VCPU_SREG_CS,
771 .ea = ctxt->_eip };
2fb53ad8 772 cur_size = fc->end - fc->start;
807941b1
TY		 773 size = min(15UL - cur_size,
774 PAGE_SIZE - offset_in_page(ctxt->_eip));
3d9b938e 775 rc = __linearize(ctxt, addr, size, false, true, &linear);
7d88bb48 776 if (unlikely(rc != X86EMUL_CONTINUE))
3d9b938e 777 return rc;
ef5d75cc
TY		 778 rc = ctxt->ops->fetch(ctxt, linear, fc->data + cur_size,
779 size, &ctxt->exception);
7d88bb48 780 if (unlikely(rc != X86EMUL_CONTINUE))
62266869 781 return rc;
2fb53ad8 782 fc->end += size;
62266869 783 }
807941b1
TY		 784 *dest = fc->data[ctxt->_eip - fc->start];
785 ctxt->_eip++;
3e2815e9 786 return X86EMUL_CONTINUE;
62266869
AK		 787}
788
789static int do_insn_fetch(struct x86_emulate_ctxt *ctxt,
807941b1 790 void *dest, unsigned size)
62266869 791{
3e2815e9 792 int rc;
62266869 793
eb3c79e6 794 /* x86 instructions are limited to 15 bytes. */
7d88bb48 795 if (unlikely(ctxt->_eip + size - ctxt->eip > 15))
eb3c79e6 796 return X86EMUL_UNHANDLEABLE;
62266869 797 while (size--) {
807941b1 798 rc = do_insn_fetch_byte(ctxt, dest++);
3e2815e9 799 if (rc != X86EMUL_CONTINUE)
62266869
AK		 800 return rc;
801 }
3e2815e9 802 return X86EMUL_CONTINUE;
62266869
AK		 803}
804
67cbc90d 805/* Fetch next part of the instruction being emulated. */
e85a1085 806#define insn_fetch(_type, _ctxt) \
67cbc90d 807({ unsigned long _x; \
e85a1085 808 rc = do_insn_fetch(_ctxt, &_x, sizeof(_type)); \
67cbc90d
TY		 809 if (rc != X86EMUL_CONTINUE) \
810 goto done; \
67cbc90d
TY		 811 (_type)_x; \
812})
813
807941b1
TY		 814#define insn_fetch_arr(_arr, _size, _ctxt) \
815({ rc = do_insn_fetch(_ctxt, _arr, (_size)); \
67cbc90d
TY		 816 if (rc != X86EMUL_CONTINUE) \
817 goto done; \
67cbc90d
TY		 818})
819
1e3c5cb0
RR		 820/*
821 * Given the 'reg' portion of a ModRM byte, and a register block, return a
822 * pointer into the block that addresses the relevant register.
823 * @highbyte_regs specifies whether to decode AH,CH,DH,BH.
824 */
dd856efa 825static void *decode_register(struct x86_emulate_ctxt *ctxt, u8 modrm_reg,
1e3c5cb0 826 int highbyte_regs)
6aa8b732
AK		 827{
828 void *p;
829
6aa8b732 830 if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8)
dd856efa
AK		 831 p = (unsigned char *)reg_rmw(ctxt, modrm_reg & 3) + 1;
832 else
833 p = reg_rmw(ctxt, modrm_reg);
6aa8b732
AK		 834 return p;
835}
836
837static int read_descriptor(struct x86_emulate_ctxt *ctxt,
90de84f5 838 struct segmented_address addr,
6aa8b732
AK		 839 u16 *size, unsigned long *address, int op_bytes)
840{
841 int rc;
842
843 if (op_bytes == 2)
844 op_bytes = 3;
845 *address = 0;
3ca3ac4d 846 rc = segmented_read_std(ctxt, addr, size, 2);
1b30eaa8 847 if (rc != X86EMUL_CONTINUE)
6aa8b732 848 return rc;
30b31ab6 849 addr.ea += 2;
3ca3ac4d 850 rc = segmented_read_std(ctxt, addr, address, op_bytes);
6aa8b732
AK		 851 return rc;
852}
853
bbe9abbd
NK		 854static int test_cc(unsigned int condition, unsigned int flags)
855{
856 int rc = 0;
857
858 switch ((condition & 15) >> 1) {
859 case 0: /* o */
860 rc |= (flags & EFLG_OF);
861 break;
862 case 1: /* b/c/nae */
863 rc |= (flags & EFLG_CF);
864 break;
865 case 2: /* z/e */
866 rc |= (flags & EFLG_ZF);
867 break;
868 case 3: /* be/na */
869 rc |= (flags & (EFLG_CF|EFLG_ZF));
870 break;
871 case 4: /* s */
872 rc |= (flags & EFLG_SF);
873 break;
874 case 5: /* p/pe */
875 rc |= (flags & EFLG_PF);
876 break;
877 case 7: /* le/ng */
878 rc |= (flags & EFLG_ZF);
879 /* fall through */
880 case 6: /* l/nge */
881 rc |= (!(flags & EFLG_SF) != !(flags & EFLG_OF));
882 break;
883 }
884
885 /* Odd condition identifiers (lsb == 1) have inverted sense. */
886 return (!!rc ^ (condition & 1));
887}
888
91ff3cb4
AK		 889static void fetch_register_operand(struct operand *op)
890{
891 switch (op->bytes) {
892 case 1:
893 op->val = *(u8 *)op->addr.reg;
894 break;
895 case 2:
896 op->val = *(u16 *)op->addr.reg;
897 break;
898 case 4:
899 op->val = *(u32 *)op->addr.reg;
900 break;
901 case 8:
902 op->val = *(u64 *)op->addr.reg;
903 break;
904 }
905}
906
1253791d
AK		 907static void read_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, int reg)
908{
909 ctxt->ops->get_fpu(ctxt);
910 switch (reg) {
911 case 0: asm("movdqu %%xmm0, %0" : "=m"(*data)); break;
912 case 1: asm("movdqu %%xmm1, %0" : "=m"(*data)); break;
913 case 2: asm("movdqu %%xmm2, %0" : "=m"(*data)); break;
914 case 3: asm("movdqu %%xmm3, %0" : "=m"(*data)); break;
915 case 4: asm("movdqu %%xmm4, %0" : "=m"(*data)); break;
916 case 5: asm("movdqu %%xmm5, %0" : "=m"(*data)); break;
917 case 6: asm("movdqu %%xmm6, %0" : "=m"(*data)); break;
918 case 7: asm("movdqu %%xmm7, %0" : "=m"(*data)); break;
919#ifdef CONFIG_X86_64
920 case 8: asm("movdqu %%xmm8, %0" : "=m"(*data)); break;
921 case 9: asm("movdqu %%xmm9, %0" : "=m"(*data)); break;
922 case 10: asm("movdqu %%xmm10, %0" : "=m"(*data)); break;
923 case 11: asm("movdqu %%xmm11, %0" : "=m"(*data)); break;
924 case 12: asm("movdqu %%xmm12, %0" : "=m"(*data)); break;
925 case 13: asm("movdqu %%xmm13, %0" : "=m"(*data)); break;
926 case 14: asm("movdqu %%xmm14, %0" : "=m"(*data)); break;
927 case 15: asm("movdqu %%xmm15, %0" : "=m"(*data)); break;
928#endif
929 default: BUG();
930 }
931 ctxt->ops->put_fpu(ctxt);
932}
933
934static void write_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data,
935 int reg)
936{
937 ctxt->ops->get_fpu(ctxt);
938 switch (reg) {
939 case 0: asm("movdqu %0, %%xmm0" : : "m"(*data)); break;
940 case 1: asm("movdqu %0, %%xmm1" : : "m"(*data)); break;
941 case 2: asm("movdqu %0, %%xmm2" : : "m"(*data)); break;
942 case 3: asm("movdqu %0, %%xmm3" : : "m"(*data)); break;
943 case 4: asm("movdqu %0, %%xmm4" : : "m"(*data)); break;
944 case 5: asm("movdqu %0, %%xmm5" : : "m"(*data)); break;
945 case 6: asm("movdqu %0, %%xmm6" : : "m"(*data)); break;
946 case 7: asm("movdqu %0, %%xmm7" : : "m"(*data)); break;
947#ifdef CONFIG_X86_64
948 case 8: asm("movdqu %0, %%xmm8" : : "m"(*data)); break;
949 case 9: asm("movdqu %0, %%xmm9" : : "m"(*data)); break;
950 case 10: asm("movdqu %0, %%xmm10" : : "m"(*data)); break;
951 case 11: asm("movdqu %0, %%xmm11" : : "m"(*data)); break;
952 case 12: asm("movdqu %0, %%xmm12" : : "m"(*data)); break;
953 case 13: asm("movdqu %0, %%xmm13" : : "m"(*data)); break;
954 case 14: asm("movdqu %0, %%xmm14" : : "m"(*data)); break;
955 case 15: asm("movdqu %0, %%xmm15" : : "m"(*data)); break;
956#endif
957 default: BUG();
958 }
959 ctxt->ops->put_fpu(ctxt);
960}
961
cbe2c9d3
AK		 962static void read_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg)
963{
964 ctxt->ops->get_fpu(ctxt);
965 switch (reg) {
966 case 0: asm("movq %%mm0, %0" : "=m"(*data)); break;
967 case 1: asm("movq %%mm1, %0" : "=m"(*data)); break;
968 case 2: asm("movq %%mm2, %0" : "=m"(*data)); break;
969 case 3: asm("movq %%mm3, %0" : "=m"(*data)); break;
970 case 4: asm("movq %%mm4, %0" : "=m"(*data)); break;
971 case 5: asm("movq %%mm5, %0" : "=m"(*data)); break;
972 case 6: asm("movq %%mm6, %0" : "=m"(*data)); break;
973 case 7: asm("movq %%mm7, %0" : "=m"(*data)); break;
974 default: BUG();
975 }
976 ctxt->ops->put_fpu(ctxt);
977}
978
979static void write_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg)
980{
981 ctxt->ops->get_fpu(ctxt);
982 switch (reg) {
983 case 0: asm("movq %0, %%mm0" : : "m"(*data)); break;
984 case 1: asm("movq %0, %%mm1" : : "m"(*data)); break;
985 case 2: asm("movq %0, %%mm2" : : "m"(*data)); break;
986 case 3: asm("movq %0, %%mm3" : : "m"(*data)); break;
987 case 4: asm("movq %0, %%mm4" : : "m"(*data)); break;
988 case 5: asm("movq %0, %%mm5" : : "m"(*data)); break;
989 case 6: asm("movq %0, %%mm6" : : "m"(*data)); break;
990 case 7: asm("movq %0, %%mm7" : : "m"(*data)); break;
991 default: BUG();
992 }
993 ctxt->ops->put_fpu(ctxt);
994}
995
1253791d 996static void decode_register_operand(struct x86_emulate_ctxt *ctxt,
2adb5ad9 997 struct operand *op)
3c118e24 998{
9dac77fa
AK		 999 unsigned reg = ctxt->modrm_reg;
1000 int highbyte_regs = ctxt->rex_prefix == 0;
33615aa9 1001
9dac77fa
AK		 1002 if (!(ctxt->d & ModRM))
1003 reg = (ctxt->b & 7) | ((ctxt->rex_prefix & 1) << 3);
1253791d 1004
9dac77fa 1005 if (ctxt->d & Sse) {
1253791d
AK		 1006 op->type = OP_XMM;
1007 op->bytes = 16;
1008 op->addr.xmm = reg;
1009 read_sse_reg(ctxt, &op->vec_val, reg);
1010 return;
1011 }
cbe2c9d3
AK		 1012 if (ctxt->d & Mmx) {
1013 reg &= 7;
1014 op->type = OP_MM;
1015 op->bytes = 8;
1016 op->addr.mm = reg;
1017 return;
1018 }
1253791d 1019
3c118e24 1020 op->type = OP_REG;
2adb5ad9 1021 if (ctxt->d & ByteOp) {
dd856efa 1022 op->addr.reg = decode_register(ctxt, reg, highbyte_regs);
3c118e24
AK		 1023 op->bytes = 1;
1024 } else {
dd856efa 1025 op->addr.reg = decode_register(ctxt, reg, 0);
9dac77fa 1026 op->bytes = ctxt->op_bytes;
3c118e24 1027 }
91ff3cb4 1028 fetch_register_operand(op);
3c118e24
AK		 1029 op->orig_val = op->val;
1030}
1031
a6e3407b
AK		 1032static void adjust_modrm_seg(struct x86_emulate_ctxt *ctxt, int base_reg)
1033{
1034 if (base_reg == VCPU_REGS_RSP || base_reg == VCPU_REGS_RBP)
1035 ctxt->modrm_seg = VCPU_SREG_SS;
1036}
1037
1c73ef66 1038static int decode_modrm(struct x86_emulate_ctxt *ctxt,
2dbd0dd7 1039 struct operand *op)
1c73ef66 1040{
1c73ef66 1041 u8 sib;
f5b4edcd 1042 int index_reg = 0, base_reg = 0, scale;
3e2815e9 1043 int rc = X86EMUL_CONTINUE;
2dbd0dd7 1044 ulong modrm_ea = 0;
1c73ef66 1045
9dac77fa
AK		 1046 if (ctxt->rex_prefix) {
1047 ctxt->modrm_reg = (ctxt->rex_prefix & 4) << 1; /* REX.R */
1048 index_reg = (ctxt->rex_prefix & 2) << 2; /* REX.X */
1049 ctxt->modrm_rm = base_reg = (ctxt->rex_prefix & 1) << 3; /* REG.B */
1c73ef66
AK		 1050 }
1051
9dac77fa
AK		 1052 ctxt->modrm_mod |= (ctxt->modrm & 0xc0) >> 6;
1053 ctxt->modrm_reg |= (ctxt->modrm & 0x38) >> 3;
1054 ctxt->modrm_rm |= (ctxt->modrm & 0x07);
1055 ctxt->modrm_seg = VCPU_SREG_DS;
1c73ef66 1056
9dac77fa 1057 if (ctxt->modrm_mod == 3) {
2dbd0dd7 1058 op->type = OP_REG;
9dac77fa 1059 op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
dd856efa 1060 op->addr.reg = decode_register(ctxt, ctxt->modrm_rm, ctxt->d & ByteOp);
9dac77fa 1061 if (ctxt->d & Sse) {
1253791d
AK		 1062 op->type = OP_XMM;
1063 op->bytes = 16;
9dac77fa
AK		 1064 op->addr.xmm = ctxt->modrm_rm;
1065 read_sse_reg(ctxt, &op->vec_val, ctxt->modrm_rm);
1253791d
AK		 1066 return rc;
1067 }
cbe2c9d3
AK		 1068 if (ctxt->d & Mmx) {
1069 op->type = OP_MM;
1070 op->bytes = 8;
1071 op->addr.xmm = ctxt->modrm_rm & 7;
1072 return rc;
1073 }
2dbd0dd7 1074 fetch_register_operand(op);
1c73ef66
AK		 1075 return rc;
1076 }
1077
2dbd0dd7
AK		 1078 op->type = OP_MEM;
1079
9dac77fa 1080 if (ctxt->ad_bytes == 2) {
dd856efa
AK		 1081 unsigned bx = reg_read(ctxt, VCPU_REGS_RBX);
1082 unsigned bp = reg_read(ctxt, VCPU_REGS_RBP);
1083 unsigned si = reg_read(ctxt, VCPU_REGS_RSI);
1084 unsigned di = reg_read(ctxt, VCPU_REGS_RDI);
1c73ef66
AK		 1085
1086 /* 16-bit ModR/M decode. */
9dac77fa 1087 switch (ctxt->modrm_mod) {
1c73ef66 1088 case 0:
9dac77fa 1089 if (ctxt->modrm_rm == 6)
e85a1085 1090 modrm_ea += insn_fetch(u16, ctxt);
1c73ef66
AK		 1091 break;
1092 case 1:
e85a1085 1093 modrm_ea += insn_fetch(s8, ctxt);
1c73ef66
AK		 1094 break;
1095 case 2:
e85a1085 1096 modrm_ea += insn_fetch(u16, ctxt);
1c73ef66
AK		 1097 break;
1098 }
9dac77fa 1099 switch (ctxt->modrm_rm) {
1c73ef66 1100 case 0:
2dbd0dd7 1101 modrm_ea += bx + si;
1c73ef66
AK		 1102 break;
1103 case 1:
2dbd0dd7 1104 modrm_ea += bx + di;
1c73ef66
AK		 1105 break;
1106 case 2:
2dbd0dd7 1107 modrm_ea += bp + si;
1c73ef66
AK		 1108 break;
1109 case 3:
2dbd0dd7 1110 modrm_ea += bp + di;
1c73ef66
AK		 1111 break;
1112 case 4:
2dbd0dd7 1113 modrm_ea += si;
1c73ef66
AK		 1114 break;
1115 case 5:
2dbd0dd7 1116 modrm_ea += di;
1c73ef66
AK		 1117 break;
1118 case 6:
9dac77fa 1119 if (ctxt->modrm_mod != 0)
2dbd0dd7 1120 modrm_ea += bp;
1c73ef66
AK		 1121 break;
1122 case 7:
2dbd0dd7 1123 modrm_ea += bx;
1c73ef66
AK		 1124 break;
1125 }
9dac77fa
AK		 1126 if (ctxt->modrm_rm == 2 || ctxt->modrm_rm == 3 ||
1127 (ctxt->modrm_rm == 6 && ctxt->modrm_mod != 0))
1128 ctxt->modrm_seg = VCPU_SREG_SS;
2dbd0dd7 1129 modrm_ea = (u16)modrm_ea;
1c73ef66
AK		 1130 } else {
1131 /* 32/64-bit ModR/M decode. */
9dac77fa 1132 if ((ctxt->modrm_rm & 7) == 4) {
e85a1085 1133 sib = insn_fetch(u8, ctxt);
1c73ef66
AK		 1134 index_reg |= (sib >> 3) & 7;
1135 base_reg |= sib & 7;
1136 scale = sib >> 6;
1137
9dac77fa 1138 if ((base_reg & 7) == 5 && ctxt->modrm_mod == 0)
e85a1085 1139 modrm_ea += insn_fetch(s32, ctxt);
a6e3407b 1140 else {
dd856efa 1141 modrm_ea += reg_read(ctxt, base_reg);
a6e3407b
AK		 1142 adjust_modrm_seg(ctxt, base_reg);
1143 }
dc71d0f1 1144 if (index_reg != 4)
dd856efa 1145 modrm_ea += reg_read(ctxt, index_reg) << scale;
9dac77fa 1146 } else if ((ctxt->modrm_rm & 7) == 5 && ctxt->modrm_mod == 0) {
84411d85 1147 if (ctxt->mode == X86EMUL_MODE_PROT64)
9dac77fa 1148 ctxt->rip_relative = 1;
a6e3407b
AK		 1149 } else {
1150 base_reg = ctxt->modrm_rm;
dd856efa 1151 modrm_ea += reg_read(ctxt, base_reg);
a6e3407b
AK		 1152 adjust_modrm_seg(ctxt, base_reg);
1153 }
9dac77fa 1154 switch (ctxt->modrm_mod) {
1c73ef66 1155 case 0:
9dac77fa 1156 if (ctxt->modrm_rm == 5)
e85a1085 1157 modrm_ea += insn_fetch(s32, ctxt);
1c73ef66
AK		 1158 break;
1159 case 1:
e85a1085 1160 modrm_ea += insn_fetch(s8, ctxt);
1c73ef66
AK		 1161 break;
1162 case 2:
e85a1085 1163 modrm_ea += insn_fetch(s32, ctxt);
1c73ef66
AK		 1164 break;
1165 }
1166 }
90de84f5 1167 op->addr.mem.ea = modrm_ea;
1c73ef66
AK		 1168done:
1169 return rc;
1170}
1171
1172static int decode_abs(struct x86_emulate_ctxt *ctxt,
2dbd0dd7 1173 struct operand *op)
1c73ef66 1174{
3e2815e9 1175 int rc = X86EMUL_CONTINUE;
1c73ef66 1176
2dbd0dd7 1177 op->type = OP_MEM;
9dac77fa 1178 switch (ctxt->ad_bytes) {
1c73ef66 1179 case 2:
e85a1085 1180 op->addr.mem.ea = insn_fetch(u16, ctxt);
1c73ef66
AK		 1181 break;
1182 case 4:
e85a1085 1183 op->addr.mem.ea = insn_fetch(u32, ctxt);
1c73ef66
AK		 1184 break;
1185 case 8:
e85a1085 1186 op->addr.mem.ea = insn_fetch(u64, ctxt);
1c73ef66
AK		 1187 break;
1188 }
1189done:
1190 return rc;
1191}
1192
9dac77fa 1193static void fetch_bit_operand(struct x86_emulate_ctxt *ctxt)
35c843c4 1194{
7129eeca 1195 long sv = 0, mask;
35c843c4 1196
9dac77fa
AK		 1197 if (ctxt->dst.type == OP_MEM && ctxt->src.type == OP_REG) {
1198 mask = ~(ctxt->dst.bytes * 8 - 1);
35c843c4 1199
9dac77fa
AK		 1200 if (ctxt->src.bytes == 2)
1201 sv = (s16)ctxt->src.val & (s16)mask;
1202 else if (ctxt->src.bytes == 4)
1203 sv = (s32)ctxt->src.val & (s32)mask;
35c843c4 1204
9dac77fa 1205 ctxt->dst.addr.mem.ea += (sv >> 3);
35c843c4 1206 }
ba7ff2b7
WY		 1207
1208 /* only subword offset */
9dac77fa 1209 ctxt->src.val &= (ctxt->dst.bytes << 3) - 1;
35c843c4
WY		 1210}
1211
dde7e6d1 1212static int read_emulated(struct x86_emulate_ctxt *ctxt,
dde7e6d1 1213 unsigned long addr, void *dest, unsigned size)
6aa8b732 1214{
dde7e6d1 1215 int rc;
9dac77fa 1216 struct read_cache *mc = &ctxt->mem_read;
6aa8b732 1217
f23b070e
XG		 1218 if (mc->pos < mc->end)
1219 goto read_cached;
6aa8b732 1220
f23b070e
XG		 1221 WARN_ON((mc->end + size) >= sizeof(mc->data));
1222
1223 rc = ctxt->ops->read_emulated(ctxt, addr, mc->data + mc->end, size,
1224 &ctxt->exception);
1225 if (rc != X86EMUL_CONTINUE)
1226 return rc;
1227
1228 mc->end += size;
1229
1230read_cached:
1231 memcpy(dest, mc->data + mc->pos, size);
1232 mc->pos += size;
dde7e6d1
AK		 1233 return X86EMUL_CONTINUE;
1234}
6aa8b732 1235
3ca3ac4d
AK		 1236static int segmented_read(struct x86_emulate_ctxt *ctxt,
1237 struct segmented_address addr,
1238 void *data,
1239 unsigned size)
1240{
9fa088f4
AK		 1241 int rc;
1242 ulong linear;
1243
83b8795a 1244 rc = linearize(ctxt, addr, size, false, &linear);
9fa088f4
AK		 1245 if (rc != X86EMUL_CONTINUE)
1246 return rc;
7b105ca2 1247 return read_emulated(ctxt, linear, data, size);
3ca3ac4d
AK		 1248}
1249
1250static int segmented_write(struct x86_emulate_ctxt *ctxt,
1251 struct segmented_address addr,
1252 const void *data,
1253 unsigned size)
1254{
9fa088f4
AK		 1255 int rc;
1256 ulong linear;
1257
83b8795a 1258 rc = linearize(ctxt, addr, size, true, &linear);
9fa088f4
AK		 1259 if (rc != X86EMUL_CONTINUE)
1260 return rc;
0f65dd70
AK		 1261 return ctxt->ops->write_emulated(ctxt, linear, data, size,
1262 &ctxt->exception);
3ca3ac4d
AK		 1263}
1264
1265static int segmented_cmpxchg(struct x86_emulate_ctxt *ctxt,
1266 struct segmented_address addr,
1267 const void *orig_data, const void *data,
1268 unsigned size)
1269{
9fa088f4
AK		 1270 int rc;
1271 ulong linear;
1272
83b8795a 1273 rc = linearize(ctxt, addr, size, true, &linear);
9fa088f4
AK		 1274 if (rc != X86EMUL_CONTINUE)
1275 return rc;
0f65dd70
AK		 1276 return ctxt->ops->cmpxchg_emulated(ctxt, linear, orig_data, data,
1277 size, &ctxt->exception);
3ca3ac4d
AK		 1278}
1279
dde7e6d1 1280static int pio_in_emulated(struct x86_emulate_ctxt *ctxt,
dde7e6d1
AK		 1281 unsigned int size, unsigned short port,
1282 void *dest)
1283{
9dac77fa 1284 struct read_cache *rc = &ctxt->io_read;
b4c6abfe 1285
dde7e6d1 1286 if (rc->pos == rc->end) { /* refill pio read ahead */
dde7e6d1 1287 unsigned int in_page, n;
9dac77fa 1288 unsigned int count = ctxt->rep_prefix ?
dd856efa 1289 address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) : 1;
dde7e6d1 1290 in_page = (ctxt->eflags & EFLG_DF) ?
dd856efa
AK		 1291 offset_in_page(reg_read(ctxt, VCPU_REGS_RDI)) :
1292 PAGE_SIZE - offset_in_page(reg_read(ctxt, VCPU_REGS_RDI));
dde7e6d1
AK		 1293 n = min(min(in_page, (unsigned int)sizeof(rc->data)) / size,
1294 count);
1295 if (n == 0)
1296 n = 1;
1297 rc->pos = rc->end = 0;
7b105ca2 1298 if (!ctxt->ops->pio_in_emulated(ctxt, size, port, rc->data, n))
dde7e6d1
AK		 1299 return 0;
1300 rc->end = n * size;
6aa8b732
AK		 1301 }
1302
dde7e6d1
AK		 1303 memcpy(dest, rc->data + rc->pos, size);
1304 rc->pos += size;
1305 return 1;
1306}
6aa8b732 1307
7f3d35fd
KW		 1308static int read_interrupt_descriptor(struct x86_emulate_ctxt *ctxt,
1309 u16 index, struct desc_struct *desc)
1310{
1311 struct desc_ptr dt;
1312 ulong addr;
1313
1314 ctxt->ops->get_idt(ctxt, &dt);
1315
1316 if (dt.size < index * 8 + 7)
1317 return emulate_gp(ctxt, index << 3 | 0x2);
1318
1319 addr = dt.address + index * 8;
1320 return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc,
1321 &ctxt->exception);
1322}
1323
dde7e6d1 1324static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt,
dde7e6d1
AK		 1325 u16 selector, struct desc_ptr *dt)
1326{
7b105ca2
TY		 1327 struct x86_emulate_ops *ops = ctxt->ops;
1328
dde7e6d1
AK		 1329 if (selector & 1 << 2) {
1330 struct desc_struct desc;
1aa36616
AK		 1331 u16 sel;
1332
dde7e6d1 1333 memset (dt, 0, sizeof *dt);
1aa36616 1334 if (!ops->get_segment(ctxt, &sel, &desc, NULL, VCPU_SREG_LDTR))
dde7e6d1 1335 return;
e09d082c 1336
dde7e6d1
AK		 1337 dt->size = desc_limit_scaled(&desc); /* what if limit > 65535? */
1338 dt->address = get_desc_base(&desc);
1339 } else
4bff1e86 1340 ops->get_gdt(ctxt, dt);
dde7e6d1 1341}
120df890 1342
dde7e6d1
AK		 1343/* allowed just for 8 bytes segments */
1344static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt,
e919464b
AK		 1345 u16 selector, struct desc_struct *desc,
1346 ulong *desc_addr_p)
dde7e6d1
AK		 1347{
1348 struct desc_ptr dt;
1349 u16 index = selector >> 3;
dde7e6d1 1350 ulong addr;
120df890 1351
7b105ca2 1352 get_descriptor_table_ptr(ctxt, selector, &dt);
120df890 1353
35d3d4a1
AK		 1354 if (dt.size < index * 8 + 7)
1355 return emulate_gp(ctxt, selector & 0xfffc);
e09d082c 1356
e919464b 1357 *desc_addr_p = addr = dt.address + index * 8;
7b105ca2
TY		 1358 return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc,
1359 &ctxt->exception);
dde7e6d1 1360}
ef65c889 1361
dde7e6d1
AK		 1362/* allowed just for 8 bytes segments */
1363static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt,
dde7e6d1
AK		 1364 u16 selector, struct desc_struct *desc)
1365{
1366 struct desc_ptr dt;
1367 u16 index = selector >> 3;
dde7e6d1 1368 ulong addr;
6aa8b732 1369
7b105ca2 1370 get_descriptor_table_ptr(ctxt, selector, &dt);
6e3d5dfb 1371
35d3d4a1
AK		 1372 if (dt.size < index * 8 + 7)
1373 return emulate_gp(ctxt, selector & 0xfffc);
6aa8b732 1374
dde7e6d1 1375 addr = dt.address + index * 8;
7b105ca2
TY		 1376 return ctxt->ops->write_std(ctxt, addr, desc, sizeof *desc,
1377 &ctxt->exception);
dde7e6d1 1378}
c7e75a3d 1379
5601d05b 1380/* Does not support long mode */
dde7e6d1 1381static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
dde7e6d1
AK		 1382 u16 selector, int seg)
1383{
869be99c 1384 struct desc_struct seg_desc, old_desc;
dde7e6d1
AK		 1385 u8 dpl, rpl, cpl;
1386 unsigned err_vec = GP_VECTOR;
1387 u32 err_code = 0;
1388 bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */
e919464b 1389 ulong desc_addr;
dde7e6d1 1390 int ret;
69f55cb1 1391
dde7e6d1 1392 memset(&seg_desc, 0, sizeof seg_desc);
69f55cb1 1393
dde7e6d1
AK		 1394 if ((seg <= VCPU_SREG_GS && ctxt->mode == X86EMUL_MODE_VM86)
1395 || ctxt->mode == X86EMUL_MODE_REAL) {
1396 /* set real mode segment descriptor */
1397 set_desc_base(&seg_desc, selector << 4);
1398 set_desc_limit(&seg_desc, 0xffff);
1399 seg_desc.type = 3;
1400 seg_desc.p = 1;
1401 seg_desc.s = 1;
66b0ab8f
KW		 1402 if (ctxt->mode == X86EMUL_MODE_VM86)
1403 seg_desc.dpl = 3;
dde7e6d1
AK		 1404 goto load;
1405 }
1406
79d5b4c3
AK		 1407 rpl = selector & 3;
1408 cpl = ctxt->ops->cpl(ctxt);
1409
1410 /* NULL selector is not valid for TR, CS and SS (except for long mode) */
1411 if ((seg == VCPU_SREG_CS
1412 || (seg == VCPU_SREG_SS
1413 && (ctxt->mode != X86EMUL_MODE_PROT64 || rpl != cpl))
1414 || seg == VCPU_SREG_TR)
dde7e6d1
AK		 1415 && null_selector)
1416 goto exception;
1417
1418 /* TR should be in GDT only */
1419 if (seg == VCPU_SREG_TR && (selector & (1 << 2)))
1420 goto exception;
1421
1422 if (null_selector) /* for NULL selector skip all following checks */
1423 goto load;
1424
e919464b 1425 ret = read_segment_descriptor(ctxt, selector, &seg_desc, &desc_addr);
dde7e6d1
AK		 1426 if (ret != X86EMUL_CONTINUE)
1427 return ret;
1428
1429 err_code = selector & 0xfffc;
1430 err_vec = GP_VECTOR;
1431
fc058680 1432 /* can't load system descriptor into segment selector */
dde7e6d1
AK		 1433 if (seg <= VCPU_SREG_GS && !seg_desc.s)
1434 goto exception;
1435
1436 if (!seg_desc.p) {
1437 err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR;
1438 goto exception;
1439 }
1440
dde7e6d1 1441 dpl = seg_desc.dpl;
dde7e6d1
AK		 1442
1443 switch (seg) {
1444 case VCPU_SREG_SS:
1445 /*
1446 * segment is not a writable data segment or segment
1447 * selector's RPL != CPL or segment selector's RPL != CPL
1448 */
1449 if (rpl != cpl || (seg_desc.type & 0xa) != 0x2 || dpl != cpl)
1450 goto exception;
6aa8b732 1451 break;
dde7e6d1
AK		 1452 case VCPU_SREG_CS:
1453 if (!(seg_desc.type & 8))
1454 goto exception;
1455
1456 if (seg_desc.type & 4) {
1457 /* conforming */
1458 if (dpl > cpl)
1459 goto exception;
1460 } else {
1461 /* nonconforming */
1462 if (rpl > cpl || dpl != cpl)
1463 goto exception;
1464 }
1465 /* CS(RPL) <- CPL */
1466 selector = (selector & 0xfffc) | cpl;
6aa8b732 1467 break;
dde7e6d1
AK		 1468 case VCPU_SREG_TR:
1469 if (seg_desc.s || (seg_desc.type != 1 && seg_desc.type != 9))
1470 goto exception;
869be99c
AK		 1471 old_desc = seg_desc;
1472 seg_desc.type |= 2; /* busy */
1473 ret = ctxt->ops->cmpxchg_emulated(ctxt, desc_addr, &old_desc, &seg_desc,
1474 sizeof(seg_desc), &ctxt->exception);
1475 if (ret != X86EMUL_CONTINUE)
1476 return ret;
dde7e6d1
AK		 1477 break;
1478 case VCPU_SREG_LDTR:
1479 if (seg_desc.s || seg_desc.type != 2)
1480 goto exception;
1481 break;
1482 default: /* DS, ES, FS, or GS */
4e62417b 1483 /*
dde7e6d1
AK		 1484 * segment is not a data or readable code segment or
1485 * ((segment is a data or nonconforming code segment)
1486 * and (both RPL and CPL > DPL))
4e62417b 1487 */
dde7e6d1
AK		 1488 if ((seg_desc.type & 0xa) == 0x8 ||
1489 (((seg_desc.type & 0xc) != 0xc) &&
1490 (rpl > dpl && cpl > dpl)))
1491 goto exception;
6aa8b732 1492 break;
dde7e6d1
AK		 1493 }
1494
1495 if (seg_desc.s) {
1496 /* mark segment as accessed */
1497 seg_desc.type |= 1;
7b105ca2 1498 ret = write_segment_descriptor(ctxt, selector, &seg_desc);
dde7e6d1
AK		 1499 if (ret != X86EMUL_CONTINUE)
1500 return ret;
1501 }
1502load:
7b105ca2 1503 ctxt->ops->set_segment(ctxt, selector, &seg_desc, 0, seg);
dde7e6d1
AK		 1504 return X86EMUL_CONTINUE;
1505exception:
1506 emulate_exception(ctxt, err_vec, err_code, true);
1507 return X86EMUL_PROPAGATE_FAULT;
1508}
1509
31be40b3
WY		 1510static void write_register_operand(struct operand *op)
1511{
1512 /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */
1513 switch (op->bytes) {
1514 case 1:
1515 *(u8 *)op->addr.reg = (u8)op->val;
1516 break;
1517 case 2:
1518 *(u16 *)op->addr.reg = (u16)op->val;
1519 break;
1520 case 4:
1521 *op->addr.reg = (u32)op->val;
1522 break; /* 64b: zero-extend */
1523 case 8:
1524 *op->addr.reg = op->val;
1525 break;
1526 }
1527}
1528
adddcecf 1529static int writeback(struct x86_emulate_ctxt *ctxt)
dde7e6d1
AK		 1530{
1531 int rc;
dde7e6d1 1532
9dac77fa 1533 switch (ctxt->dst.type) {
dde7e6d1 1534 case OP_REG:
9dac77fa 1535 write_register_operand(&ctxt->dst);
6aa8b732 1536 break;
dde7e6d1 1537 case OP_MEM:
9dac77fa 1538 if (ctxt->lock_prefix)
3ca3ac4d 1539 rc = segmented_cmpxchg(ctxt,
9dac77fa
AK		 1540 ctxt->dst.addr.mem,
1541 &ctxt->dst.orig_val,
1542 &ctxt->dst.val,
1543 ctxt->dst.bytes);
341de7e3 1544 else
3ca3ac4d 1545 rc = segmented_write(ctxt,
9dac77fa
AK		 1546 ctxt->dst.addr.mem,
1547 &ctxt->dst.val,
1548 ctxt->dst.bytes);
dde7e6d1
AK		 1549 if (rc != X86EMUL_CONTINUE)
1550 return rc;
a682e354 1551 break;
1253791d 1552 case OP_XMM:
9dac77fa 1553 write_sse_reg(ctxt, &ctxt->dst.vec_val, ctxt->dst.addr.xmm);
1253791d 1554 break;
cbe2c9d3
AK		 1555 case OP_MM:
1556 write_mmx_reg(ctxt, &ctxt->dst.mm_val, ctxt->dst.addr.mm);
1557 break;
dde7e6d1
AK		 1558 case OP_NONE:
1559 /* no writeback */
414e6277 1560 break;
dde7e6d1 1561 default:
414e6277 1562 break;
6aa8b732 1563 }
dde7e6d1
AK		 1564 return X86EMUL_CONTINUE;
1565}
6aa8b732 1566
51ddff50 1567static int push(struct x86_emulate_ctxt *ctxt, void *data, int bytes)
dde7e6d1 1568{
4179bb02 1569 struct segmented_address addr;
0dc8d10f 1570
5ad105e5 1571 rsp_increment(ctxt, -bytes);
dd856efa 1572 addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt);
4179bb02
TY		 1573 addr.seg = VCPU_SREG_SS;
1574
51ddff50
AK		 1575 return segmented_write(ctxt, addr, data, bytes);
1576}
1577
1578static int em_push(struct x86_emulate_ctxt *ctxt)
1579{
4179bb02 1580 /* Disable writeback. */
9dac77fa 1581 ctxt->dst.type = OP_NONE;
51ddff50 1582 return push(ctxt, &ctxt->src.val, ctxt->op_bytes);
dde7e6d1 1583}
69f55cb1 1584
dde7e6d1 1585static int emulate_pop(struct x86_emulate_ctxt *ctxt,
dde7e6d1
AK		 1586 void *dest, int len)
1587{
dde7e6d1 1588 int rc;
90de84f5 1589 struct segmented_address addr;
8b4caf66 1590
dd856efa 1591 addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt);
90de84f5 1592 addr.seg = VCPU_SREG_SS;
3ca3ac4d 1593 rc = segmented_read(ctxt, addr, dest, len);
dde7e6d1
AK		 1594 if (rc != X86EMUL_CONTINUE)
1595 return rc;
1596
5ad105e5 1597 rsp_increment(ctxt, len);
dde7e6d1 1598 return rc;
8b4caf66
LV		 1599}
1600
c54fe504
TY		 1601static int em_pop(struct x86_emulate_ctxt *ctxt)
1602{
9dac77fa 1603 return emulate_pop(ctxt, &ctxt->dst.val, ctxt->op_bytes);
c54fe504
TY		 1604}
1605
dde7e6d1 1606static int emulate_popf(struct x86_emulate_ctxt *ctxt,
7b105ca2 1607 void *dest, int len)
9de41573
GN		 1608{
1609 int rc;
dde7e6d1
AK		 1610 unsigned long val, change_mask;
1611 int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
7b105ca2 1612 int cpl = ctxt->ops->cpl(ctxt);
9de41573 1613
3b9be3bf 1614 rc = emulate_pop(ctxt, &val, len);
dde7e6d1
AK		 1615 if (rc != X86EMUL_CONTINUE)
1616 return rc;
9de41573 1617
dde7e6d1
AK		 1618 change_mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_OF
1619 | EFLG_TF | EFLG_DF | EFLG_NT | EFLG_RF | EFLG_AC | EFLG_ID;
9de41573 1620
dde7e6d1
AK		 1621 switch(ctxt->mode) {
1622 case X86EMUL_MODE_PROT64:
1623 case X86EMUL_MODE_PROT32:
1624 case X86EMUL_MODE_PROT16:
1625 if (cpl == 0)
1626 change_mask |= EFLG_IOPL;
1627 if (cpl <= iopl)
1628 change_mask |= EFLG_IF;
1629 break;
1630 case X86EMUL_MODE_VM86:
35d3d4a1
AK		 1631 if (iopl < 3)
1632 return emulate_gp(ctxt, 0);
dde7e6d1
AK		 1633 change_mask |= EFLG_IF;
1634 break;
1635 default: /* real mode */
1636 change_mask |= (EFLG_IOPL | EFLG_IF);
1637 break;
9de41573 1638 }
dde7e6d1
AK		 1639
1640 *(unsigned long *)dest =
1641 (ctxt->eflags & ~change_mask) | (val & change_mask);
1642
1643 return rc;
9de41573
GN		 1644}
1645
62aaa2f0
TY		 1646static int em_popf(struct x86_emulate_ctxt *ctxt)
1647{
9dac77fa
AK		 1648 ctxt->dst.type = OP_REG;
1649 ctxt->dst.addr.reg = &ctxt->eflags;
1650 ctxt->dst.bytes = ctxt->op_bytes;
1651 return emulate_popf(ctxt, &ctxt->dst.val, ctxt->op_bytes);
62aaa2f0
TY		 1652}
1653
612e89f0
AK		 1654static int em_enter(struct x86_emulate_ctxt *ctxt)
1655{
1656 int rc;
1657 unsigned frame_size = ctxt->src.val;
1658 unsigned nesting_level = ctxt->src2.val & 31;
dd856efa 1659 ulong rbp;
612e89f0
AK		 1660
1661 if (nesting_level)
1662 return X86EMUL_UNHANDLEABLE;
1663
dd856efa
AK		 1664 rbp = reg_read(ctxt, VCPU_REGS_RBP);
1665 rc = push(ctxt, &rbp, stack_size(ctxt));
612e89f0
AK		 1666 if (rc != X86EMUL_CONTINUE)
1667 return rc;
dd856efa 1668 assign_masked(reg_rmw(ctxt, VCPU_REGS_RBP), reg_read(ctxt, VCPU_REGS_RSP),
612e89f0 1669 stack_mask(ctxt));
dd856efa
AK		 1670 assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP),
1671 reg_read(ctxt, VCPU_REGS_RSP) - frame_size,
612e89f0
AK		 1672 stack_mask(ctxt));
1673 return X86EMUL_CONTINUE;
1674}
1675
f47cfa31
AK		 1676static int em_leave(struct x86_emulate_ctxt *ctxt)
1677{
dd856efa 1678 assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), reg_read(ctxt, VCPU_REGS_RBP),
f47cfa31 1679 stack_mask(ctxt));
dd856efa 1680 return emulate_pop(ctxt, reg_rmw(ctxt, VCPU_REGS_RBP), ctxt->op_bytes);
f47cfa31
AK		 1681}
1682
1cd196ea 1683static int em_push_sreg(struct x86_emulate_ctxt *ctxt)
7b262e90 1684{
1cd196ea
AK		 1685 int seg = ctxt->src2.val;
1686
9dac77fa 1687 ctxt->src.val = get_segment_selector(ctxt, seg);
7b262e90 1688
4487b3b4 1689 return em_push(ctxt);
7b262e90
GN		 1690}
1691
1cd196ea 1692static int em_pop_sreg(struct x86_emulate_ctxt *ctxt)
38ba30ba 1693{
1cd196ea 1694 int seg = ctxt->src2.val;
dde7e6d1
AK		 1695 unsigned long selector;
1696 int rc;
38ba30ba 1697
9dac77fa 1698 rc = emulate_pop(ctxt, &selector, ctxt->op_bytes);
dde7e6d1
AK		 1699 if (rc != X86EMUL_CONTINUE)
1700 return rc;
1701
7b105ca2 1702 rc = load_segment_descriptor(ctxt, (u16)selector, seg);
dde7e6d1 1703 return rc;
38ba30ba
GN		 1704}
1705
b96a7fad 1706static int em_pusha(struct x86_emulate_ctxt *ctxt)
38ba30ba 1707{
dd856efa 1708 unsigned long old_esp = reg_read(ctxt, VCPU_REGS_RSP);
dde7e6d1
AK		 1709 int rc = X86EMUL_CONTINUE;
1710 int reg = VCPU_REGS_RAX;
38ba30ba 1711
dde7e6d1
AK		 1712 while (reg <= VCPU_REGS_RDI) {
1713 (reg == VCPU_REGS_RSP) ?
dd856efa 1714 (ctxt->src.val = old_esp) : (ctxt->src.val = reg_read(ctxt, reg));
38ba30ba 1715
4487b3b4 1716 rc = em_push(ctxt);
dde7e6d1
AK		 1717 if (rc != X86EMUL_CONTINUE)
1718 return rc;
38ba30ba 1719
dde7e6d1 1720 ++reg;
38ba30ba 1721 }
38ba30ba 1722
dde7e6d1 1723 return rc;
38ba30ba
GN		 1724}
1725
62aaa2f0
TY		 1726static int em_pushf(struct x86_emulate_ctxt *ctxt)
1727{
9dac77fa 1728 ctxt->src.val = (unsigned long)ctxt->eflags;
62aaa2f0
TY		 1729 return em_push(ctxt);
1730}
1731
b96a7fad 1732static int em_popa(struct x86_emulate_ctxt *ctxt)
38ba30ba 1733{
dde7e6d1
AK		 1734 int rc = X86EMUL_CONTINUE;
1735 int reg = VCPU_REGS_RDI;
38ba30ba 1736
dde7e6d1
AK		 1737 while (reg >= VCPU_REGS_RAX) {
1738 if (reg == VCPU_REGS_RSP) {
5ad105e5 1739 rsp_increment(ctxt, ctxt->op_bytes);
dde7e6d1
AK		 1740 --reg;
1741 }
38ba30ba 1742
dd856efa 1743 rc = emulate_pop(ctxt, reg_rmw(ctxt, reg), ctxt->op_bytes);
dde7e6d1
AK		 1744 if (rc != X86EMUL_CONTINUE)
1745 break;
1746 --reg;
38ba30ba 1747 }
dde7e6d1 1748 return rc;
38ba30ba
GN		 1749}
1750
dd856efa 1751static int __emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq)
6e154e56 1752{
7b105ca2 1753 struct x86_emulate_ops *ops = ctxt->ops;
5c56e1cf 1754 int rc;
6e154e56
MG		 1755 struct desc_ptr dt;
1756 gva_t cs_addr;
1757 gva_t eip_addr;
1758 u16 cs, eip;
6e154e56
MG		 1759
1760 /* TODO: Add limit checks */
9dac77fa 1761 ctxt->src.val = ctxt->eflags;
4487b3b4 1762 rc = em_push(ctxt);
5c56e1cf
AK		 1763 if (rc != X86EMUL_CONTINUE)
1764 return rc;
6e154e56
MG		 1765
1766 ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC);
1767
9dac77fa 1768 ctxt->src.val = get_segment_selector(ctxt, VCPU_SREG_CS);
4487b3b4 1769 rc = em_push(ctxt);
5c56e1cf
AK		 1770 if (rc != X86EMUL_CONTINUE)
1771 return rc;
6e154e56 1772
9dac77fa 1773 ctxt->src.val = ctxt->_eip;
4487b3b4 1774 rc = em_push(ctxt);
5c56e1cf
AK		 1775 if (rc != X86EMUL_CONTINUE)
1776 return rc;
1777
4bff1e86 1778 ops->get_idt(ctxt, &dt);
6e154e56
MG		 1779
1780 eip_addr = dt.address + (irq << 2);
1781 cs_addr = dt.address + (irq << 2) + 2;
1782
0f65dd70 1783 rc = ops->read_std(ctxt, cs_addr, &cs, 2, &ctxt->exception);
6e154e56
MG		 1784 if (rc != X86EMUL_CONTINUE)
1785 return rc;
1786
0f65dd70 1787 rc = ops->read_std(ctxt, eip_addr, &eip, 2, &ctxt->exception);
6e154e56
MG		 1788 if (rc != X86EMUL_CONTINUE)
1789 return rc;
1790
7b105ca2 1791 rc = load_segment_descriptor(ctxt, cs, VCPU_SREG_CS);
6e154e56
MG		 1792 if (rc != X86EMUL_CONTINUE)
1793 return rc;
1794
9dac77fa 1795 ctxt->_eip = eip;
6e154e56
MG		 1796
1797 return rc;
1798}
1799
dd856efa
AK		 1800int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq)
1801{
1802 int rc;
1803
1804 invalidate_registers(ctxt);
1805 rc = __emulate_int_real(ctxt, irq);
1806 if (rc == X86EMUL_CONTINUE)
1807 writeback_registers(ctxt);
1808 return rc;
1809}
1810
7b105ca2 1811static int emulate_int(struct x86_emulate_ctxt *ctxt, int irq)
6e154e56
MG		 1812{
1813 switch(ctxt->mode) {
1814 case X86EMUL_MODE_REAL:
dd856efa 1815 return __emulate_int_real(ctxt, irq);
6e154e56
MG		 1816 case X86EMUL_MODE_VM86:
1817 case X86EMUL_MODE_PROT16:
1818 case X86EMUL_MODE_PROT32:
1819 case X86EMUL_MODE_PROT64:
1820 default:
1821 /* Protected mode interrupts unimplemented yet */
1822 return X86EMUL_UNHANDLEABLE;
1823 }
1824}
1825
7b105ca2 1826static int emulate_iret_real(struct x86_emulate_ctxt *ctxt)
38ba30ba 1827{
dde7e6d1
AK		 1828 int rc = X86EMUL_CONTINUE;
1829 unsigned long temp_eip = 0;
1830 unsigned long temp_eflags = 0;
1831 unsigned long cs = 0;
1832 unsigned long mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_TF |
1833 EFLG_IF | EFLG_DF | EFLG_OF | EFLG_IOPL | EFLG_NT | EFLG_RF |
1834 EFLG_AC | EFLG_ID | (1 << 1); /* Last one is the reserved bit */
1835 unsigned long vm86_mask = EFLG_VM | EFLG_VIF | EFLG_VIP;
38ba30ba 1836
dde7e6d1 1837 /* TODO: Add stack limit check */
38ba30ba 1838
9dac77fa 1839 rc = emulate_pop(ctxt, &temp_eip, ctxt->op_bytes);
38ba30ba 1840
dde7e6d1
AK		 1841 if (rc != X86EMUL_CONTINUE)
1842 return rc;
38ba30ba 1843
35d3d4a1
AK		 1844 if (temp_eip & ~0xffff)
1845 return emulate_gp(ctxt, 0);
38ba30ba 1846
9dac77fa 1847 rc = emulate_pop(ctxt, &cs, ctxt->op_bytes);
38ba30ba 1848
dde7e6d1
AK		 1849 if (rc != X86EMUL_CONTINUE)
1850 return rc;
38ba30ba 1851
9dac77fa 1852 rc = emulate_pop(ctxt, &temp_eflags, ctxt->op_bytes);
38ba30ba 1853
dde7e6d1
AK		 1854 if (rc != X86EMUL_CONTINUE)
1855 return rc;
38ba30ba 1856
7b105ca2 1857 rc = load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS);
38ba30ba 1858
dde7e6d1
AK		 1859 if (rc != X86EMUL_CONTINUE)
1860 return rc;
38ba30ba 1861
9dac77fa 1862 ctxt->_eip = temp_eip;
38ba30ba 1863
38ba30ba 1864
9dac77fa 1865 if (ctxt->op_bytes == 4)
dde7e6d1 1866 ctxt->eflags = ((temp_eflags & mask) | (ctxt->eflags & vm86_mask));
9dac77fa 1867 else if (ctxt->op_bytes == 2) {
dde7e6d1
AK		 1868 ctxt->eflags &= ~0xffff;
1869 ctxt->eflags |= temp_eflags;
38ba30ba 1870 }
dde7e6d1
AK		 1871
1872 ctxt->eflags &= ~EFLG_RESERVED_ZEROS_MASK; /* Clear reserved zeros */
1873 ctxt->eflags |= EFLG_RESERVED_ONE_MASK;
1874
1875 return rc;
38ba30ba
GN		 1876}
1877
e01991e7 1878static int em_iret(struct x86_emulate_ctxt *ctxt)
c37eda13 1879{
dde7e6d1
AK		 1880 switch(ctxt->mode) {
1881 case X86EMUL_MODE_REAL:
7b105ca2 1882 return emulate_iret_real(ctxt);
dde7e6d1
AK		 1883 case X86EMUL_MODE_VM86:
1884 case X86EMUL_MODE_PROT16:
1885 case X86EMUL_MODE_PROT32:
1886 case X86EMUL_MODE_PROT64:
c37eda13 1887 default:
dde7e6d1
AK		 1888 /* iret from protected mode unimplemented yet */
1889 return X86EMUL_UNHANDLEABLE;
c37eda13 1890 }
c37eda13
WY		 1891}
1892
d2f62766
TY		 1893static int em_jmp_far(struct x86_emulate_ctxt *ctxt)
1894{
d2f62766
TY		 1895 int rc;
1896 unsigned short sel;
1897
9dac77fa 1898 memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);
d2f62766 1899
7b105ca2 1900 rc = load_segment_descriptor(ctxt, sel, VCPU_SREG_CS);
d2f62766
TY		 1901 if (rc != X86EMUL_CONTINUE)
1902 return rc;
1903
9dac77fa
AK		 1904 ctxt->_eip = 0;
1905 memcpy(&ctxt->_eip, ctxt->src.valptr, ctxt->op_bytes);
d2f62766
TY		 1906 return X86EMUL_CONTINUE;
1907}
1908
51187683 1909static int em_grp2(struct x86_emulate_ctxt *ctxt)
8cdbd2c9 1910{
9dac77fa 1911 switch (ctxt->modrm_reg) {
8cdbd2c9 1912 case 0: /* rol */
a31b9cea 1913 emulate_2op_SrcB(ctxt, "rol");
8cdbd2c9
LV		 1914 break;
1915 case 1: /* ror */
a31b9cea 1916 emulate_2op_SrcB(ctxt, "ror");
8cdbd2c9
LV		 1917 break;
1918 case 2: /* rcl */
a31b9cea 1919 emulate_2op_SrcB(ctxt, "rcl");
8cdbd2c9
LV		 1920 break;
1921 case 3: /* rcr */
a31b9cea 1922 emulate_2op_SrcB(ctxt, "rcr");
8cdbd2c9
LV		 1923 break;
1924 case 4: /* sal/shl */
1925 case 6: /* sal/shl */
a31b9cea 1926 emulate_2op_SrcB(ctxt, "sal");
8cdbd2c9
LV		 1927 break;
1928 case 5: /* shr */
a31b9cea 1929 emulate_2op_SrcB(ctxt, "shr");
8cdbd2c9
LV		 1930 break;
1931 case 7: /* sar */
a31b9cea 1932 emulate_2op_SrcB(ctxt, "sar");
8cdbd2c9
LV		 1933 break;
1934 }
51187683 1935 return X86EMUL_CONTINUE;
8cdbd2c9
LV		 1936}
1937
3329ece1
AK		 1938static int em_not(struct x86_emulate_ctxt *ctxt)
1939{
1940 ctxt->dst.val = ~ctxt->dst.val;
1941 return X86EMUL_CONTINUE;
1942}
1943
1944static int em_neg(struct x86_emulate_ctxt *ctxt)
1945{
1946 emulate_1op(ctxt, "neg");
1947 return X86EMUL_CONTINUE;
1948}
1949
1950static int em_mul_ex(struct x86_emulate_ctxt *ctxt)
1951{
1952 u8 ex = 0;
1953
1954 emulate_1op_rax_rdx(ctxt, "mul", ex);
1955 return X86EMUL_CONTINUE;
1956}
1957
1958static int em_imul_ex(struct x86_emulate_ctxt *ctxt)
1959{
1960 u8 ex = 0;
1961
1962 emulate_1op_rax_rdx(ctxt, "imul", ex);
1963 return X86EMUL_CONTINUE;
1964}
1965
1966static int em_div_ex(struct x86_emulate_ctxt *ctxt)
8cdbd2c9 1967{
34d1f490 1968 u8 de = 0;
8cdbd2c9 1969
3329ece1
AK		 1970 emulate_1op_rax_rdx(ctxt, "div", de);
1971 if (de)
1972 return emulate_de(ctxt);
1973 return X86EMUL_CONTINUE;
1974}
1975
1976static int em_idiv_ex(struct x86_emulate_ctxt *ctxt)
1977{
1978 u8 de = 0;
1979
1980 emulate_1op_rax_rdx(ctxt, "idiv", de);
34d1f490
AK		 1981 if (de)
1982 return emulate_de(ctxt);
8c5eee30 1983 return X86EMUL_CONTINUE;
8cdbd2c9
LV		 1984}
1985
51187683 1986static int em_grp45(struct x86_emulate_ctxt *ctxt)
8cdbd2c9 1987{
4179bb02 1988 int rc = X86EMUL_CONTINUE;
8cdbd2c9 1989
9dac77fa 1990 switch (ctxt->modrm_reg) {
8cdbd2c9 1991 case 0: /* inc */
d1eef45d 1992 emulate_1op(ctxt, "inc");
8cdbd2c9
LV		 1993 break;
1994 case 1: /* dec */
d1eef45d 1995 emulate_1op(ctxt, "dec");
8cdbd2c9 1996 break;
d19292e4
MG		 1997 case 2: /* call near abs */ {
1998 long int old_eip;
9dac77fa
AK		 1999 old_eip = ctxt->_eip;
2000 ctxt->_eip = ctxt->src.val;
2001 ctxt->src.val = old_eip;
4487b3b4 2002 rc = em_push(ctxt);
d19292e4
MG		 2003 break;
2004 }
8cdbd2c9 2005 case 4: /* jmp abs */
9dac77fa 2006 ctxt->_eip = ctxt->src.val;
8cdbd2c9 2007 break;
d2f62766
TY		 2008 case 5: /* jmp far */
2009 rc = em_jmp_far(ctxt);
2010 break;
8cdbd2c9 2011 case 6: /* push */
4487b3b4 2012 rc = em_push(ctxt);
8cdbd2c9 2013 break;
8cdbd2c9 2014 }
4179bb02 2015 return rc;
8cdbd2c9
LV		 2016}
2017
e0dac408 2018static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt)
8cdbd2c9 2019{
9dac77fa 2020 u64 old = ctxt->dst.orig_val64;
8cdbd2c9 2021
dd856efa
AK		 2022 if (((u32) (old >> 0) != (u32) reg_read(ctxt, VCPU_REGS_RAX)) ||
2023 ((u32) (old >> 32) != (u32) reg_read(ctxt, VCPU_REGS_RDX))) {
2024 *reg_write(ctxt, VCPU_REGS_RAX) = (u32) (old >> 0);
2025 *reg_write(ctxt, VCPU_REGS_RDX) = (u32) (old >> 32);
05f086f8 2026 ctxt->eflags &= ~EFLG_ZF;
8cdbd2c9 2027 } else {
dd856efa
AK		 2028 ctxt->dst.val64 = ((u64)reg_read(ctxt, VCPU_REGS_RCX) << 32) |
2029 (u32) reg_read(ctxt, VCPU_REGS_RBX);
8cdbd2c9 2030
05f086f8 2031 ctxt->eflags |= EFLG_ZF;
8cdbd2c9 2032 }
1b30eaa8 2033 return X86EMUL_CONTINUE;
8cdbd2c9
LV		 2034}
2035
ebda02c2
TY		 2036static int em_ret(struct x86_emulate_ctxt *ctxt)
2037{
9dac77fa
AK		 2038 ctxt->dst.type = OP_REG;
2039 ctxt->dst.addr.reg = &ctxt->_eip;
2040 ctxt->dst.bytes = ctxt->op_bytes;
ebda02c2
TY		 2041 return em_pop(ctxt);
2042}
2043
e01991e7 2044static int em_ret_far(struct x86_emulate_ctxt *ctxt)
a77ab5ea 2045{
a77ab5ea
AK		 2046 int rc;
2047 unsigned long cs;
2048
9dac77fa 2049 rc = emulate_pop(ctxt, &ctxt->_eip, ctxt->op_bytes);
1b30eaa8 2050 if (rc != X86EMUL_CONTINUE)
a77ab5ea 2051 return rc;
9dac77fa
AK		 2052 if (ctxt->op_bytes == 4)
2053 ctxt->_eip = (u32)ctxt->_eip;
2054 rc = emulate_pop(ctxt, &cs, ctxt->op_bytes);
1b30eaa8 2055 if (rc != X86EMUL_CONTINUE)
a77ab5ea 2056 return rc;
7b105ca2 2057 rc = load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS);
a77ab5ea
AK		 2058 return rc;
2059}
2060
e940b5c2
TY		 2061static int em_cmpxchg(struct x86_emulate_ctxt *ctxt)
2062{
2063 /* Save real source value, then compare EAX against destination. */
2064 ctxt->src.orig_val = ctxt->src.val;
dd856efa 2065 ctxt->src.val = reg_read(ctxt, VCPU_REGS_RAX);
e940b5c2
TY		 2066 emulate_2op_SrcV(ctxt, "cmp");
2067
2068 if (ctxt->eflags & EFLG_ZF) {
2069 /* Success: write back to memory. */
2070 ctxt->dst.val = ctxt->src.orig_val;
2071 } else {
2072 /* Failure: write the value we saw to EAX. */
2073 ctxt->dst.type = OP_REG;
dd856efa 2074 ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX);
e940b5c2
TY		 2075 }
2076 return X86EMUL_CONTINUE;
2077}
2078
d4b4325f 2079static int em_lseg(struct x86_emulate_ctxt *ctxt)
09b5f4d3 2080{
d4b4325f 2081 int seg = ctxt->src2.val;
09b5f4d3
WY		 2082 unsigned short sel;
2083 int rc;
2084
9dac77fa 2085 memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);
09b5f4d3 2086
7b105ca2 2087 rc = load_segment_descriptor(ctxt, sel, seg);
09b5f4d3
WY		 2088 if (rc != X86EMUL_CONTINUE)
2089 return rc;
2090
9dac77fa 2091 ctxt->dst.val = ctxt->src.val;
09b5f4d3
WY		 2092 return rc;
2093}
2094
7b105ca2 2095static void
e66bb2cc 2096setup_syscalls_segments(struct x86_emulate_ctxt *ctxt,
7b105ca2 2097 struct desc_struct *cs, struct desc_struct *ss)
e66bb2cc 2098{
e66bb2cc 2099 cs->l = 0; /* will be adjusted later */
79168fd1 2100 set_desc_base(cs, 0); /* flat segment */
e66bb2cc 2101 cs->g = 1; /* 4kb granularity */
79168fd1 2102 set_desc_limit(cs, 0xfffff); /* 4GB limit */
e66bb2cc
AP		 2103 cs->type = 0x0b; /* Read, Execute, Accessed */
2104 cs->s = 1;
2105 cs->dpl = 0; /* will be adjusted later */
79168fd1
GN		 2106 cs->p = 1;
2107 cs->d = 1;
99245b50 2108 cs->avl = 0;
e66bb2cc 2109
79168fd1
GN		 2110 set_desc_base(ss, 0); /* flat segment */
2111 set_desc_limit(ss, 0xfffff); /* 4GB limit */
e66bb2cc
AP		 2112 ss->g = 1; /* 4kb granularity */
2113 ss->s = 1;
2114 ss->type = 0x03; /* Read/Write, Accessed */
79168fd1 2115 ss->d = 1; /* 32bit stack segment */
e66bb2cc 2116 ss->dpl = 0;
79168fd1 2117 ss->p = 1;
99245b50
GN		 2118 ss->l = 0;
2119 ss->avl = 0;
e66bb2cc
AP		 2120}
2121
1a18a69b
AK		 2122static bool vendor_intel(struct x86_emulate_ctxt *ctxt)
2123{
2124 u32 eax, ebx, ecx, edx;
2125
2126 eax = ecx = 0;
0017f93a
AK		 2127 ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
2128 return ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx
1a18a69b
AK		 2129 && ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx
2130 && edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx;
2131}
2132
c2226fc9
SB		 2133static bool em_syscall_is_enabled(struct x86_emulate_ctxt *ctxt)
2134{
2135 struct x86_emulate_ops *ops = ctxt->ops;
2136 u32 eax, ebx, ecx, edx;
2137
2138 /*
2139 * syscall should always be enabled in longmode - so only become
2140 * vendor specific (cpuid) if other modes are active...
2141 */
2142 if (ctxt->mode == X86EMUL_MODE_PROT64)
2143 return true;
2144
2145 eax = 0x00000000;
2146 ecx = 0x00000000;
0017f93a
AK		 2147 ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
2148 /*
2149 * Intel ("GenuineIntel")
2150 * remark: Intel CPUs only support "syscall" in 64bit
2151 * longmode. Also an 64bit guest with a
2152 * 32bit compat-app running will #UD !! While this
2153 * behaviour can be fixed (by emulating) into AMD
2154 * response - CPUs of AMD can't behave like Intel.
2155 */
2156 if (ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx &&
2157 ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx &&
2158 edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx)
2159 return false;
2160
2161 /* AMD ("AuthenticAMD") */
2162 if (ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx &&
2163 ecx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ecx &&
2164 edx == X86EMUL_CPUID_VENDOR_AuthenticAMD_edx)
2165 return true;
2166
2167 /* AMD ("AMDisbetter!") */
2168 if (ebx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ebx &&
2169 ecx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ecx &&
2170 edx == X86EMUL_CPUID_VENDOR_AMDisbetterI_edx)
2171 return true;
c2226fc9
SB		 2172
2173 /* default: (not Intel, not AMD), apply Intel's stricter rules... */
2174 return false;
2175}
2176
e01991e7 2177static int em_syscall(struct x86_emulate_ctxt *ctxt)
e66bb2cc 2178{
7b105ca2 2179 struct x86_emulate_ops *ops = ctxt->ops;
79168fd1 2180 struct desc_struct cs, ss;
e66bb2cc 2181 u64 msr_data;
79168fd1 2182 u16 cs_sel, ss_sel;
c2ad2bb3 2183 u64 efer = 0;
e66bb2cc
AP		 2184
2185 /* syscall is not available in real mode */
2e901c4c 2186 if (ctxt->mode == X86EMUL_MODE_REAL ||
35d3d4a1
AK		 2187 ctxt->mode == X86EMUL_MODE_VM86)
2188 return emulate_ud(ctxt);
e66bb2cc 2189
c2226fc9
SB		 2190 if (!(em_syscall_is_enabled(ctxt)))
2191 return emulate_ud(ctxt);
2192
c2ad2bb3 2193 ops->get_msr(ctxt, MSR_EFER, &efer);
7b105ca2 2194 setup_syscalls_segments(ctxt, &cs, &ss);
e66bb2cc 2195
c2226fc9
SB		 2196 if (!(efer & EFER_SCE))
2197 return emulate_ud(ctxt);
2198
717746e3 2199 ops->get_msr(ctxt, MSR_STAR, &msr_data);
e66bb2cc 2200 msr_data >>= 32;
79168fd1
GN		 2201 cs_sel = (u16)(msr_data & 0xfffc);
2202 ss_sel = (u16)(msr_data + 8);
e66bb2cc 2203
c2ad2bb3 2204 if (efer & EFER_LMA) {
79168fd1 2205 cs.d = 0;
e66bb2cc
AP		 2206 cs.l = 1;
2207 }
1aa36616
AK		 2208 ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
2209 ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
e66bb2cc 2210
dd856efa 2211 *reg_write(ctxt, VCPU_REGS_RCX) = ctxt->_eip;
c2ad2bb3 2212 if (efer & EFER_LMA) {
e66bb2cc 2213#ifdef CONFIG_X86_64
dd856efa 2214 *reg_write(ctxt, VCPU_REGS_R11) = ctxt->eflags & ~EFLG_RF;
e66bb2cc 2215
717746e3 2216 ops->get_msr(ctxt,
3fb1b5db
GN		 2217 ctxt->mode == X86EMUL_MODE_PROT64 ?
2218 MSR_LSTAR : MSR_CSTAR, &msr_data);
9dac77fa 2219 ctxt->_eip = msr_data;
e66bb2cc 2220
717746e3 2221 ops->get_msr(ctxt, MSR_SYSCALL_MASK, &msr_data);
e66bb2cc
AP		 2222 ctxt->eflags &= ~(msr_data | EFLG_RF);
2223#endif
2224 } else {
2225 /* legacy mode */
717746e3 2226 ops->get_msr(ctxt, MSR_STAR, &msr_data);
9dac77fa 2227 ctxt->_eip = (u32)msr_data;
e66bb2cc
AP		 2228
2229 ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF);
2230 }
2231
e54cfa97 2232 return X86EMUL_CONTINUE;
e66bb2cc
AP		 2233}
2234
e01991e7 2235static int em_sysenter(struct x86_emulate_ctxt *ctxt)
8c604352 2236{
7b105ca2 2237 struct x86_emulate_ops *ops = ctxt->ops;
79168fd1 2238 struct desc_struct cs, ss;
8c604352 2239 u64 msr_data;
79168fd1 2240 u16 cs_sel, ss_sel;
c2ad2bb3 2241 u64 efer = 0;
8c604352 2242
7b105ca2 2243 ops->get_msr(ctxt, MSR_EFER, &efer);
a0044755 2244 /* inject #GP if in real mode */
35d3d4a1
AK		 2245 if (ctxt->mode == X86EMUL_MODE_REAL)
2246 return emulate_gp(ctxt, 0);
8c604352 2247
1a18a69b
AK		 2248 /*
2249 * Not recognized on AMD in compat mode (but is recognized in legacy
2250 * mode).
2251 */
2252 if ((ctxt->mode == X86EMUL_MODE_PROT32) && (efer & EFER_LMA)
2253 && !vendor_intel(ctxt))
2254 return emulate_ud(ctxt);
2255
8c604352
AP		 2256 /* XXX sysenter/sysexit have not been tested in 64bit mode.
2257 * Therefore, we inject an #UD.
2258 */
35d3d4a1
AK		 2259 if (ctxt->mode == X86EMUL_MODE_PROT64)
2260 return emulate_ud(ctxt);
8c604352 2261
7b105ca2 2262 setup_syscalls_segments(ctxt, &cs, &ss);
8c604352 2263
717746e3 2264 ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data);
8c604352
AP		 2265 switch (ctxt->mode) {
2266 case X86EMUL_MODE_PROT32:
35d3d4a1
AK		 2267 if ((msr_data & 0xfffc) == 0x0)
2268 return emulate_gp(ctxt, 0);
8c604352
AP		 2269 break;
2270 case X86EMUL_MODE_PROT64:
35d3d4a1
AK		 2271 if (msr_data == 0x0)
2272 return emulate_gp(ctxt, 0);
8c604352
AP		 2273 break;
2274 }
2275
2276 ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF);
79168fd1
GN		 2277 cs_sel = (u16)msr_data;
2278 cs_sel &= ~SELECTOR_RPL_MASK;
2279 ss_sel = cs_sel + 8;
2280 ss_sel &= ~SELECTOR_RPL_MASK;
c2ad2bb3 2281 if (ctxt->mode == X86EMUL_MODE_PROT64 || (efer & EFER_LMA)) {
79168fd1 2282 cs.d = 0;
8c604352
AP		 2283 cs.l = 1;
2284 }
2285
1aa36616
AK		 2286 ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
2287 ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
8c604352 2288
717746e3 2289 ops->get_msr(ctxt, MSR_IA32_SYSENTER_EIP, &msr_data);
9dac77fa 2290 ctxt->_eip = msr_data;
8c604352 2291
717746e3 2292 ops->get_msr(ctxt, MSR_IA32_SYSENTER_ESP, &msr_data);
dd856efa 2293 *reg_write(ctxt, VCPU_REGS_RSP) = msr_data;
8c604352 2294
e54cfa97 2295 return X86EMUL_CONTINUE;
8c604352
AP		 2296}
2297
e01991e7 2298static int em_sysexit(struct x86_emulate_ctxt *ctxt)
4668f050 2299{
7b105ca2 2300 struct x86_emulate_ops *ops = ctxt->ops;
79168fd1 2301 struct desc_struct cs, ss;
4668f050
AP		 2302 u64 msr_data;
2303 int usermode;
1249b96e 2304 u16 cs_sel = 0, ss_sel = 0;
4668f050 2305
a0044755
GN		 2306 /* inject #GP if in real mode or Virtual 8086 mode */
2307 if (ctxt->mode == X86EMUL_MODE_REAL ||
35d3d4a1
AK		 2308 ctxt->mode == X86EMUL_MODE_VM86)
2309 return emulate_gp(ctxt, 0);
4668f050 2310
7b105ca2 2311 setup_syscalls_segments(ctxt, &cs, &ss);
4668f050 2312
9dac77fa 2313 if ((ctxt->rex_prefix & 0x8) != 0x0)
4668f050
AP		 2314 usermode = X86EMUL_MODE_PROT64;
2315 else
2316 usermode = X86EMUL_MODE_PROT32;
2317
2318 cs.dpl = 3;
2319 ss.dpl = 3;
717746e3 2320 ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data);
4668f050
AP		 2321 switch (usermode) {
2322 case X86EMUL_MODE_PROT32:
79168fd1 2323 cs_sel = (u16)(msr_data + 16);
35d3d4a1
AK		 2324 if ((msr_data & 0xfffc) == 0x0)
2325 return emulate_gp(ctxt, 0);
79168fd1 2326 ss_sel = (u16)(msr_data + 24);
4668f050
AP		 2327 break;
2328 case X86EMUL_MODE_PROT64:
79168fd1 2329 cs_sel = (u16)(msr_data + 32);
35d3d4a1
AK		 2330 if (msr_data == 0x0)
2331 return emulate_gp(ctxt, 0);
79168fd1
GN		 2332 ss_sel = cs_sel + 8;
2333 cs.d = 0;
4668f050
AP		 2334 cs.l = 1;
2335 break;
2336 }
79168fd1
GN		 2337 cs_sel |= SELECTOR_RPL_MASK;
2338 ss_sel |= SELECTOR_RPL_MASK;
4668f050 2339
1aa36616
AK		 2340 ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
2341 ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
4668f050 2342
dd856efa
AK		 2343 ctxt->_eip = reg_read(ctxt, VCPU_REGS_RDX);
2344 *reg_write(ctxt, VCPU_REGS_RSP) = reg_read(ctxt, VCPU_REGS_RCX);
4668f050 2345
e54cfa97 2346 return X86EMUL_CONTINUE;
4668f050
AP		 2347}
2348
7b105ca2 2349static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt)
f850e2e6
GN		 2350{
2351 int iopl;
2352 if (ctxt->mode == X86EMUL_MODE_REAL)
2353 return false;
2354 if (ctxt->mode == X86EMUL_MODE_VM86)
2355 return true;
2356 iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
7b105ca2 2357 return ctxt->ops->cpl(ctxt) > iopl;
f850e2e6
GN		 2358}
2359
2360static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt,
f850e2e6
GN		 2361 u16 port, u16 len)
2362{
7b105ca2 2363 struct x86_emulate_ops *ops = ctxt->ops;
79168fd1 2364 struct desc_struct tr_seg;
5601d05b 2365 u32 base3;
f850e2e6 2366 int r;
1aa36616 2367 u16 tr, io_bitmap_ptr, perm, bit_idx = port & 0x7;
f850e2e6 2368 unsigned mask = (1 << len) - 1;
5601d05b 2369 unsigned long base;
f850e2e6 2370
1aa36616 2371 ops->get_segment(ctxt, &tr, &tr_seg, &base3, VCPU_SREG_TR);
79168fd1 2372 if (!tr_seg.p)
f850e2e6 2373 return false;
79168fd1 2374 if (desc_limit_scaled(&tr_seg) < 103)
f850e2e6 2375 return false;
5601d05b
GN		 2376 base = get_desc_base(&tr_seg);
2377#ifdef CONFIG_X86_64
2378 base |= ((u64)base3) << 32;
2379#endif
0f65dd70 2380 r = ops->read_std(ctxt, base + 102, &io_bitmap_ptr, 2, NULL);
f850e2e6
GN		 2381 if (r != X86EMUL_CONTINUE)
2382 return false;
79168fd1 2383 if (io_bitmap_ptr + port/8 > desc_limit_scaled(&tr_seg))
f850e2e6 2384 return false;
0f65dd70 2385 r = ops->read_std(ctxt, base + io_bitmap_ptr + port/8, &perm, 2, NULL);
f850e2e6
GN		 2386 if (r != X86EMUL_CONTINUE)
2387 return false;
2388 if ((perm >> bit_idx) & mask)
2389 return false;
2390 return true;
2391}
2392
2393static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt,
f850e2e6
GN		 2394 u16 port, u16 len)
2395{
4fc40f07
GN		 2396 if (ctxt->perm_ok)
2397 return true;
2398
7b105ca2
TY		 2399 if (emulator_bad_iopl(ctxt))
2400 if (!emulator_io_port_access_allowed(ctxt, port, len))
f850e2e6 2401 return false;
4fc40f07
GN		 2402
2403 ctxt->perm_ok = true;
2404
f850e2e6
GN		 2405 return true;
2406}
2407
38ba30ba 2408static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt,
38ba30ba
GN		 2409 struct tss_segment_16 *tss)
2410{
9dac77fa 2411 tss->ip = ctxt->_eip;
38ba30ba 2412 tss->flag = ctxt->eflags;
dd856efa
AK		 2413 tss->ax = reg_read(ctxt, VCPU_REGS_RAX);
2414 tss->cx = reg_read(ctxt, VCPU_REGS_RCX);
2415 tss->dx = reg_read(ctxt, VCPU_REGS_RDX);
2416 tss->bx = reg_read(ctxt, VCPU_REGS_RBX);
2417 tss->sp = reg_read(ctxt, VCPU_REGS_RSP);
2418 tss->bp = reg_read(ctxt, VCPU_REGS_RBP);
2419 tss->si = reg_read(ctxt, VCPU_REGS_RSI);
2420 tss->di = reg_read(ctxt, VCPU_REGS_RDI);
38ba30ba 2421
1aa36616
AK		 2422 tss->es = get_segment_selector(ctxt, VCPU_SREG_ES);
2423 tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS);
2424 tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS);
2425 tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS);
2426 tss->ldt = get_segment_selector(ctxt, VCPU_SREG_LDTR);
38ba30ba
GN		 2427}
2428
2429static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt,
38ba30ba
GN		 2430 struct tss_segment_16 *tss)
2431{
38ba30ba
GN		 2432 int ret;
2433
9dac77fa 2434 ctxt->_eip = tss->ip;
38ba30ba 2435 ctxt->eflags = tss->flag | 2;
dd856efa
AK		 2436 *reg_write(ctxt, VCPU_REGS_RAX) = tss->ax;
2437 *reg_write(ctxt, VCPU_REGS_RCX) = tss->cx;
2438 *reg_write(ctxt, VCPU_REGS_RDX) = tss->dx;
2439 *reg_write(ctxt, VCPU_REGS_RBX) = tss->bx;
2440 *reg_write(ctxt, VCPU_REGS_RSP) = tss->sp;
2441 *reg_write(ctxt, VCPU_REGS_RBP) = tss->bp;
2442 *reg_write(ctxt, VCPU_REGS_RSI) = tss->si;
2443 *reg_write(ctxt, VCPU_REGS_RDI) = tss->di;
38ba30ba
GN		 2444
2445 /*
2446 * SDM says that segment selectors are loaded before segment
2447 * descriptors
2448 */
1aa36616
AK		 2449 set_segment_selector(ctxt, tss->ldt, VCPU_SREG_LDTR);
2450 set_segment_selector(ctxt, tss->es, VCPU_SREG_ES);
2451 set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS);
2452 set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS);
2453 set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS);
38ba30ba
GN		 2454
2455 /*
fc058680 2456 * Now load segment descriptors. If fault happens at this stage
38ba30ba
GN		 2457 * it is handled in a context of new task
2458 */
7b105ca2 2459 ret = load_segment_descriptor(ctxt, tss->ldt, VCPU_SREG_LDTR);
38ba30ba
GN		 2460 if (ret != X86EMUL_CONTINUE)
2461 return ret;
7b105ca2 2462 ret = load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES);
38ba30ba
GN		 2463 if (ret != X86EMUL_CONTINUE)
2464 return ret;
7b105ca2 2465 ret = load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS);
38ba30ba
GN		 2466 if (ret != X86EMUL_CONTINUE)
2467 return ret;
7b105ca2 2468 ret = load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS);
38ba30ba
GN		 2469 if (ret != X86EMUL_CONTINUE)
2470 return ret;
7b105ca2 2471 ret = load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS);
38ba30ba
GN		 2472 if (ret != X86EMUL_CONTINUE)
2473 return ret;
2474
2475 return X86EMUL_CONTINUE;
2476}
2477
2478static int task_switch_16(struct x86_emulate_ctxt *ctxt,
38ba30ba
GN		 2479 u16 tss_selector, u16 old_tss_sel,
2480 ulong old_tss_base, struct desc_struct *new_desc)
2481{
7b105ca2 2482 struct x86_emulate_ops *ops = ctxt->ops;
38ba30ba
GN		 2483 struct tss_segment_16 tss_seg;
2484 int ret;
bcc55cba 2485 u32 new_tss_base = get_desc_base(new_desc);
38ba30ba 2486
0f65dd70 2487 ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
bcc55cba 2488 &ctxt->exception);
db297e3d 2489 if (ret != X86EMUL_CONTINUE)
38ba30ba 2490 /* FIXME: need to provide precise fault address */
38ba30ba 2491 return ret;
38ba30ba 2492
7b105ca2 2493 save_state_to_tss16(ctxt, &tss_seg);
38ba30ba 2494
0f65dd70 2495 ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
bcc55cba 2496 &ctxt->exception);
db297e3d 2497 if (ret != X86EMUL_CONTINUE)
38ba30ba 2498 /* FIXME: need to provide precise fault address */
38ba30ba 2499 return ret;
38ba30ba 2500
0f65dd70 2501 ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg,
bcc55cba 2502 &ctxt->exception);
db297e3d 2503 if (ret != X86EMUL_CONTINUE)
38ba30ba 2504 /* FIXME: need to provide precise fault address */
38ba30ba 2505 return ret;
38ba30ba
GN		 2506
2507 if (old_tss_sel != 0xffff) {
2508 tss_seg.prev_task_link = old_tss_sel;
2509
0f65dd70 2510 ret = ops->write_std(ctxt, new_tss_base,
38ba30ba
GN		 2511 &tss_seg.prev_task_link,
2512 sizeof tss_seg.prev_task_link,
0f65dd70 2513 &ctxt->exception);
db297e3d 2514 if (ret != X86EMUL_CONTINUE)
38ba30ba 2515 /* FIXME: need to provide precise fault address */
38ba30ba 2516 return ret;
38ba30ba
GN		 2517 }
2518
7b105ca2 2519 return load_state_from_tss16(ctxt, &tss_seg);
38ba30ba
GN		 2520}
2521
2522static void save_state_to_tss32(struct x86_emulate_ctxt *ctxt,
38ba30ba
GN		 2523 struct tss_segment_32 *tss)
2524{
7b105ca2 2525 tss->cr3 = ctxt->ops->get_cr(ctxt, 3);
9dac77fa 2526 tss->eip = ctxt->_eip;
38ba30ba 2527 tss->eflags = ctxt->eflags;
dd856efa
AK		 2528 tss->eax = reg_read(ctxt, VCPU_REGS_RAX);
2529 tss->ecx = reg_read(ctxt, VCPU_REGS_RCX);
2530 tss->edx = reg_read(ctxt, VCPU_REGS_RDX);
2531 tss->ebx = reg_read(ctxt, VCPU_REGS_RBX);
2532 tss->esp = reg_read(ctxt, VCPU_REGS_RSP);
2533 tss->ebp = reg_read(ctxt, VCPU_REGS_RBP);
2534 tss->esi = reg_read(ctxt, VCPU_REGS_RSI);
2535 tss->edi = reg_read(ctxt, VCPU_REGS_RDI);
38ba30ba 2536
1aa36616
AK		 2537 tss->es = get_segment_selector(ctxt, VCPU_SREG_ES);
2538 tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS);
2539 tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS);
2540 tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS);
2541 tss->fs = get_segment_selector(ctxt, VCPU_SREG_FS);
2542 tss->gs = get_segment_selector(ctxt, VCPU_SREG_GS);
2543 tss->ldt_selector = get_segment_selector(ctxt, VCPU_SREG_LDTR);
38ba30ba
GN		 2544}
2545
2546static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt,
38ba30ba
GN		 2547 struct tss_segment_32 *tss)
2548{
38ba30ba
GN		 2549 int ret;
2550
7b105ca2 2551 if (ctxt->ops->set_cr(ctxt, 3, tss->cr3))
35d3d4a1 2552 return emulate_gp(ctxt, 0);
9dac77fa 2553 ctxt->_eip = tss->eip;
38ba30ba 2554 ctxt->eflags = tss->eflags | 2;
4cee4798
KW		 2555
2556 /* General purpose registers */
dd856efa
AK		 2557 *reg_write(ctxt, VCPU_REGS_RAX) = tss->eax;
2558 *reg_write(ctxt, VCPU_REGS_RCX) = tss->ecx;
2559 *reg_write(ctxt, VCPU_REGS_RDX) = tss->edx;
2560 *reg_write(ctxt, VCPU_REGS_RBX) = tss->ebx;
2561 *reg_write(ctxt, VCPU_REGS_RSP) = tss->esp;
2562 *reg_write(ctxt, VCPU_REGS_RBP) = tss->ebp;
2563 *reg_write(ctxt, VCPU_REGS_RSI) = tss->esi;
2564 *reg_write(ctxt, VCPU_REGS_RDI) = tss->edi;
38ba30ba
GN		 2565
2566 /*
2567 * SDM says that segment selectors are loaded before segment
2568 * descriptors
2569 */
1aa36616
AK		 2570 set_segment_selector(ctxt, tss->ldt_selector, VCPU_SREG_LDTR);
2571 set_segment_selector(ctxt, tss->es, VCPU_SREG_ES);
2572 set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS);
2573 set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS);
2574 set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS);
2575 set_segment_selector(ctxt, tss->fs, VCPU_SREG_FS);
2576 set_segment_selector(ctxt, tss->gs, VCPU_SREG_GS);
38ba30ba 2577
4cee4798
KW		 2578 /*
2579 * If we're switching between Protected Mode and VM86, we need to make
2580 * sure to update the mode before loading the segment descriptors so
2581 * that the selectors are interpreted correctly.
2582 *
2583 * Need to get rflags to the vcpu struct immediately because it
2584 * influences the CPL which is checked at least when loading the segment
2585 * descriptors and when pushing an error code to the new kernel stack.
2586 *
2587 * TODO Introduce a separate ctxt->ops->set_cpl callback
2588 */
2589 if (ctxt->eflags & X86_EFLAGS_VM)
2590 ctxt->mode = X86EMUL_MODE_VM86;
2591 else
2592 ctxt->mode = X86EMUL_MODE_PROT32;
2593
2594 ctxt->ops->set_rflags(ctxt, ctxt->eflags);
2595
38ba30ba
GN		 2596 /*
2597 * Now load segment descriptors. If fault happenes at this stage
2598 * it is handled in a context of new task
2599 */
7b105ca2 2600 ret = load_segment_descriptor(ctxt, tss->ldt_selector, VCPU_SREG_LDTR);
38ba30ba
GN		 2601 if (ret != X86EMUL_CONTINUE)
2602 return ret;
7b105ca2 2603 ret = load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES);
38ba30ba
GN		 2604 if (ret != X86EMUL_CONTINUE)
2605 return ret;
7b105ca2 2606 ret = load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS);
38ba30ba
GN		 2607 if (ret != X86EMUL_CONTINUE)
2608 return ret;
7b105ca2 2609 ret = load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS);
38ba30ba
GN		 2610 if (ret != X86EMUL_CONTINUE)
2611 return ret;
7b105ca2 2612 ret = load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS);
38ba30ba
GN		 2613 if (ret != X86EMUL_CONTINUE)
2614 return ret;
7b105ca2 2615 ret = load_segment_descriptor(ctxt, tss->fs, VCPU_SREG_FS);
38ba30ba
GN		 2616 if (ret != X86EMUL_CONTINUE)
2617 return ret;
7b105ca2 2618 ret = load_segment_descriptor(ctxt, tss->gs, VCPU_SREG_GS);
38ba30ba
GN		 2619 if (ret != X86EMUL_CONTINUE)
2620 return ret;
2621
2622 return X86EMUL_CONTINUE;
2623}
2624
2625static int task_switch_32(struct x86_emulate_ctxt *ctxt,
38ba30ba
GN		 2626 u16 tss_selector, u16 old_tss_sel,
2627 ulong old_tss_base, struct desc_struct *new_desc)
2628{
7b105ca2 2629 struct x86_emulate_ops *ops = ctxt->ops;
38ba30ba
GN		 2630 struct tss_segment_32 tss_seg;
2631 int ret;
bcc55cba 2632 u32 new_tss_base = get_desc_base(new_desc);
38ba30ba 2633
0f65dd70 2634 ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
bcc55cba 2635 &ctxt->exception);
db297e3d 2636 if (ret != X86EMUL_CONTINUE)
38ba30ba 2637 /* FIXME: need to provide precise fault address */
38ba30ba 2638 return ret;
38ba30ba 2639
7b105ca2 2640 save_state_to_tss32(ctxt, &tss_seg);
38ba30ba 2641
0f65dd70 2642 ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
bcc55cba 2643 &ctxt->exception);
db297e3d 2644 if (ret != X86EMUL_CONTINUE)
38ba30ba 2645 /* FIXME: need to provide precise fault address */
38ba30ba 2646 return ret;
38ba30ba 2647
0f65dd70 2648 ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg,
bcc55cba 2649 &ctxt->exception);
db297e3d 2650 if (ret != X86EMUL_CONTINUE)
38ba30ba 2651 /* FIXME: need to provide precise fault address */
38ba30ba 2652 return ret;
38ba30ba
GN		 2653
2654 if (old_tss_sel != 0xffff) {
2655 tss_seg.prev_task_link = old_tss_sel;
2656
0f65dd70 2657 ret = ops->write_std(ctxt, new_tss_base,
38ba30ba
GN		 2658 &tss_seg.prev_task_link,
2659 sizeof tss_seg.prev_task_link,
0f65dd70 2660 &ctxt->exception);
db297e3d 2661 if (ret != X86EMUL_CONTINUE)
38ba30ba 2662 /* FIXME: need to provide precise fault address */
38ba30ba 2663 return ret;
38ba30ba
GN		 2664 }
2665
7b105ca2 2666 return load_state_from_tss32(ctxt, &tss_seg);
38ba30ba
GN		 2667}
2668
2669static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
7f3d35fd 2670 u16 tss_selector, int idt_index, int reason,
e269fb21 2671 bool has_error_code, u32 error_code)
38ba30ba 2672{
7b105ca2 2673 struct x86_emulate_ops *ops = ctxt->ops;
38ba30ba
GN		 2674 struct desc_struct curr_tss_desc, next_tss_desc;
2675 int ret;
1aa36616 2676 u16 old_tss_sel = get_segment_selector(ctxt, VCPU_SREG_TR);
38ba30ba 2677 ulong old_tss_base =
4bff1e86 2678 ops->get_cached_segment_base(ctxt, VCPU_SREG_TR);
ceffb459 2679 u32 desc_limit;
e919464b 2680 ulong desc_addr;
38ba30ba
GN		 2681
2682 /* FIXME: old_tss_base == ~0 ? */
2683
e919464b 2684 ret = read_segment_descriptor(ctxt, tss_selector, &next_tss_desc, &desc_addr);
38ba30ba
GN		 2685 if (ret != X86EMUL_CONTINUE)
2686 return ret;
e919464b 2687 ret = read_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc, &desc_addr);
38ba30ba
GN		 2688 if (ret != X86EMUL_CONTINUE)
2689 return ret;
2690
2691 /* FIXME: check that next_tss_desc is tss */
2692
7f3d35fd
KW		 2693 /*
2694 * Check privileges. The three cases are task switch caused by...
2695 *
2696 * 1. jmp/call/int to task gate: Check against DPL of the task gate
2697 * 2. Exception/IRQ/iret: No check is performed
fc058680 2698 * 3. jmp/call to TSS: Check against DPL of the TSS
7f3d35fd
KW		 2699 */
2700 if (reason == TASK_SWITCH_GATE) {
2701 if (idt_index != -1) {
2702 /* Software interrupts */
2703 struct desc_struct task_gate_desc;
2704 int dpl;
2705
2706 ret = read_interrupt_descriptor(ctxt, idt_index,
2707 &task_gate_desc);
2708 if (ret != X86EMUL_CONTINUE)
2709 return ret;
2710
2711 dpl = task_gate_desc.dpl;
2712 if ((tss_selector & 3) > dpl || ops->cpl(ctxt) > dpl)
2713 return emulate_gp(ctxt, (idt_index << 3) | 0x2);
2714 }
2715 } else if (reason != TASK_SWITCH_IRET) {
2716 int dpl = next_tss_desc.dpl;
2717 if ((tss_selector & 3) > dpl || ops->cpl(ctxt) > dpl)
2718 return emulate_gp(ctxt, tss_selector);
38ba30ba
GN		 2719 }
2720
7f3d35fd 2721
ceffb459
GN		 2722 desc_limit = desc_limit_scaled(&next_tss_desc);
2723 if (!next_tss_desc.p ||
2724 ((desc_limit < 0x67 && (next_tss_desc.type & 8)) ||
2725 desc_limit < 0x2b)) {
54b8486f 2726 emulate_ts(ctxt, tss_selector & 0xfffc);
38ba30ba
GN		 2727 return X86EMUL_PROPAGATE_FAULT;
2728 }
2729
2730 if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
2731 curr_tss_desc.type &= ~(1 << 1); /* clear busy flag */
7b105ca2 2732 write_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc);
38ba30ba
GN		 2733 }
2734
2735 if (reason == TASK_SWITCH_IRET)
2736 ctxt->eflags = ctxt->eflags & ~X86_EFLAGS_NT;
2737
2738 /* set back link to prev task only if NT bit is set in eflags
fc058680 2739 note that old_tss_sel is not used after this point */
38ba30ba
GN		 2740 if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE)
2741 old_tss_sel = 0xffff;
2742
2743 if (next_tss_desc.type & 8)
7b105ca2 2744 ret = task_switch_32(ctxt, tss_selector, old_tss_sel,
38ba30ba
GN		 2745 old_tss_base, &next_tss_desc);
2746 else
7b105ca2 2747 ret = task_switch_16(ctxt, tss_selector, old_tss_sel,
38ba30ba 2748 old_tss_base, &next_tss_desc);
0760d448
JK		 2749 if (ret != X86EMUL_CONTINUE)
2750 return ret;
38ba30ba
GN		 2751
2752 if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE)
2753 ctxt->eflags = ctxt->eflags | X86_EFLAGS_NT;
2754
2755 if (reason != TASK_SWITCH_IRET) {
2756 next_tss_desc.type |= (1 << 1); /* set busy flag */
7b105ca2 2757 write_segment_descriptor(ctxt, tss_selector, &next_tss_desc);
38ba30ba
GN		 2758 }
2759
717746e3 2760 ops->set_cr(ctxt, 0, ops->get_cr(ctxt, 0) | X86_CR0_TS);
1aa36616 2761 ops->set_segment(ctxt, tss_selector, &next_tss_desc, 0, VCPU_SREG_TR);
38ba30ba 2762
e269fb21 2763 if (has_error_code) {
9dac77fa
AK		 2764 ctxt->op_bytes = ctxt->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2;
2765 ctxt->lock_prefix = 0;
2766 ctxt->src.val = (unsigned long) error_code;
4487b3b4 2767 ret = em_push(ctxt);
e269fb21
JK		 2768 }
2769
38ba30ba
GN		 2770 return ret;
2771}
2772
2773int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
7f3d35fd 2774 u16 tss_selector, int idt_index, int reason,
e269fb21 2775 bool has_error_code, u32 error_code)
38ba30ba 2776{
38ba30ba
GN		 2777 int rc;
2778
dd856efa 2779 invalidate_registers(ctxt);
9dac77fa
AK		 2780 ctxt->_eip = ctxt->eip;
2781 ctxt->dst.type = OP_NONE;
38ba30ba 2782
7f3d35fd 2783 rc = emulator_do_task_switch(ctxt, tss_selector, idt_index, reason,
e269fb21 2784 has_error_code, error_code);
38ba30ba 2785
dd856efa 2786 if (rc == X86EMUL_CONTINUE) {
9dac77fa 2787 ctxt->eip = ctxt->_eip;
dd856efa
AK		 2788 writeback_registers(ctxt);
2789 }
38ba30ba 2790
a0c0ab2f 2791 return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
38ba30ba
GN		 2792}
2793
90de84f5 2794static void string_addr_inc(struct x86_emulate_ctxt *ctxt, unsigned seg,
d9271123 2795 int reg, struct operand *op)
a682e354 2796{
a682e354
GN		 2797 int df = (ctxt->eflags & EFLG_DF) ? -1 : 1;
2798
dd856efa
AK		 2799 register_address_increment(ctxt, reg_rmw(ctxt, reg), df * op->bytes);
2800 op->addr.mem.ea = register_address(ctxt, reg_read(ctxt, reg));
90de84f5 2801 op->addr.mem.seg = seg;
a682e354
GN		 2802}
2803
7af04fc0
AK		 2804static int em_das(struct x86_emulate_ctxt *ctxt)
2805{
7af04fc0
AK		 2806 u8 al, old_al;
2807 bool af, cf, old_cf;
2808
2809 cf = ctxt->eflags & X86_EFLAGS_CF;
9dac77fa 2810 al = ctxt->dst.val;
7af04fc0
AK		 2811
2812 old_al = al;
2813 old_cf = cf;
2814 cf = false;
2815 af = ctxt->eflags & X86_EFLAGS_AF;
2816 if ((al & 0x0f) > 9 || af) {
2817 al -= 6;
2818 cf = old_cf | (al >= 250);
2819 af = true;
2820 } else {
2821 af = false;
2822 }
2823 if (old_al > 0x99 || old_cf) {
2824 al -= 0x60;
2825 cf = true;
2826 }
2827
9dac77fa 2828 ctxt->dst.val = al;
7af04fc0 2829 /* Set PF, ZF, SF */
9dac77fa
AK		 2830 ctxt->src.type = OP_IMM;
2831 ctxt->src.val = 0;
2832 ctxt->src.bytes = 1;
a31b9cea 2833 emulate_2op_SrcV(ctxt, "or");
7af04fc0
AK		 2834 ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF);
2835 if (cf)
2836 ctxt->eflags |= X86_EFLAGS_CF;
2837 if (af)
2838 ctxt->eflags |= X86_EFLAGS_AF;
2839 return X86EMUL_CONTINUE;
2840}
2841
d4ddafcd
TY		 2842static int em_call(struct x86_emulate_ctxt *ctxt)
2843{
2844 long rel = ctxt->src.val;
2845
2846 ctxt->src.val = (unsigned long)ctxt->_eip;
2847 jmp_rel(ctxt, rel);
2848 return em_push(ctxt);
2849}
2850
0ef753b8
AK		 2851static int em_call_far(struct x86_emulate_ctxt *ctxt)
2852{
0ef753b8
AK		 2853 u16 sel, old_cs;
2854 ulong old_eip;
2855 int rc;
2856
1aa36616 2857 old_cs = get_segment_selector(ctxt, VCPU_SREG_CS);
9dac77fa 2858 old_eip = ctxt->_eip;
0ef753b8 2859
9dac77fa 2860 memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);
7b105ca2 2861 if (load_segment_descriptor(ctxt, sel, VCPU_SREG_CS))
0ef753b8
AK		 2862 return X86EMUL_CONTINUE;
2863
9dac77fa
AK		 2864 ctxt->_eip = 0;
2865 memcpy(&ctxt->_eip, ctxt->src.valptr, ctxt->op_bytes);
0ef753b8 2866
9dac77fa 2867 ctxt->src.val = old_cs;
4487b3b4 2868 rc = em_push(ctxt);
0ef753b8
AK		 2869 if (rc != X86EMUL_CONTINUE)
2870 return rc;
2871
9dac77fa 2872 ctxt->src.val = old_eip;
4487b3b4 2873 return em_push(ctxt);
0ef753b8
AK		 2874}
2875
40ece7c7
AK		 2876static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt)
2877{
40ece7c7
AK		 2878 int rc;
2879
9dac77fa
AK		 2880 ctxt->dst.type = OP_REG;
2881 ctxt->dst.addr.reg = &ctxt->_eip;
2882 ctxt->dst.bytes = ctxt->op_bytes;
2883 rc = emulate_pop(ctxt, &ctxt->dst.val, ctxt->op_bytes);
40ece7c7
AK		 2884 if (rc != X86EMUL_CONTINUE)
2885 return rc;
5ad105e5 2886 rsp_increment(ctxt, ctxt->src.val);
40ece7c7
AK		 2887 return X86EMUL_CONTINUE;
2888}
2889
d67fc27a
TY		 2890static int em_add(struct x86_emulate_ctxt *ctxt)
2891{
a31b9cea 2892 emulate_2op_SrcV(ctxt, "add");
d67fc27a
TY		 2893 return X86EMUL_CONTINUE;
2894}
2895
2896static int em_or(struct x86_emulate_ctxt *ctxt)
2897{
a31b9cea 2898 emulate_2op_SrcV(ctxt, "or");
d67fc27a
TY		 2899 return X86EMUL_CONTINUE;
2900}
2901
2902static int em_adc(struct x86_emulate_ctxt *ctxt)
2903{
a31b9cea 2904 emulate_2op_SrcV(ctxt, "adc");
d67fc27a
TY		 2905 return X86EMUL_CONTINUE;
2906}
2907
2908static int em_sbb(struct x86_emulate_ctxt *ctxt)
2909{
a31b9cea 2910 emulate_2op_SrcV(ctxt, "sbb");
d67fc27a
TY		 2911 return X86EMUL_CONTINUE;
2912}
2913
2914static int em_and(struct x86_emulate_ctxt *ctxt)
2915{
a31b9cea 2916 emulate_2op_SrcV(ctxt, "and");
d67fc27a
TY		 2917 return X86EMUL_CONTINUE;
2918}
2919
2920static int em_sub(struct x86_emulate_ctxt *ctxt)
2921{
a31b9cea 2922 emulate_2op_SrcV(ctxt, "sub");
d67fc27a
TY		 2923 return X86EMUL_CONTINUE;
2924}
2925
2926static int em_xor(struct x86_emulate_ctxt *ctxt)
2927{
a31b9cea 2928 emulate_2op_SrcV(ctxt, "xor");
d67fc27a
TY		 2929 return X86EMUL_CONTINUE;
2930}
2931
2932static int em_cmp(struct x86_emulate_ctxt *ctxt)
2933{
a31b9cea 2934 emulate_2op_SrcV(ctxt, "cmp");
d67fc27a 2935 /* Disable writeback. */
9dac77fa 2936 ctxt->dst.type = OP_NONE;
d67fc27a
TY		 2937 return X86EMUL_CONTINUE;
2938}
2939
9f21ca59
TY		 2940static int em_test(struct x86_emulate_ctxt *ctxt)
2941{
a31b9cea 2942 emulate_2op_SrcV(ctxt, "test");
caa8a168
AK		 2943 /* Disable writeback. */
2944 ctxt->dst.type = OP_NONE;
9f21ca59
TY		 2945 return X86EMUL_CONTINUE;
2946}
2947
e4f973ae
TY		 2948static int em_xchg(struct x86_emulate_ctxt *ctxt)
2949{
e4f973ae 2950 /* Write back the register source. */
9dac77fa
AK		 2951 ctxt->src.val = ctxt->dst.val;
2952 write_register_operand(&ctxt->src);
e4f973ae
TY		 2953
2954 /* Write back the memory destination with implicit LOCK prefix. */
9dac77fa
AK		 2955 ctxt->dst.val = ctxt->src.orig_val;
2956 ctxt->lock_prefix = 1;
e4f973ae
TY		 2957 return X86EMUL_CONTINUE;
2958}
2959
5c82aa29 2960static int em_imul(struct x86_emulate_ctxt *ctxt)
f3a1b9f4 2961{
a31b9cea 2962 emulate_2op_SrcV_nobyte(ctxt, "imul");
f3a1b9f4
AK		 2963 return X86EMUL_CONTINUE;
2964}
2965
5c82aa29
AK		 2966static int em_imul_3op(struct x86_emulate_ctxt *ctxt)
2967{
9dac77fa 2968 ctxt->dst.val = ctxt->src2.val;
5c82aa29
AK		 2969 return em_imul(ctxt);
2970}
2971
61429142
AK		 2972static int em_cwd(struct x86_emulate_ctxt *ctxt)
2973{
9dac77fa
AK		 2974 ctxt->dst.type = OP_REG;
2975 ctxt->dst.bytes = ctxt->src.bytes;
dd856efa 2976 ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX);
9dac77fa 2977 ctxt->dst.val = ~((ctxt->src.val >> (ctxt->src.bytes * 8 - 1)) - 1);
61429142
AK		 2978
2979 return X86EMUL_CONTINUE;
2980}
2981
48bb5d3c
AK		 2982static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
2983{
48bb5d3c
AK		 2984 u64 tsc = 0;
2985
717746e3 2986 ctxt->ops->get_msr(ctxt, MSR_IA32_TSC, &tsc);
dd856efa
AK		 2987 *reg_write(ctxt, VCPU_REGS_RAX) = (u32)tsc;
2988 *reg_write(ctxt, VCPU_REGS_RDX) = tsc >> 32;
48bb5d3c
AK		 2989 return X86EMUL_CONTINUE;
2990}
2991
222d21aa
AK		 2992static int em_rdpmc(struct x86_emulate_ctxt *ctxt)
2993{
2994 u64 pmc;
2995
dd856efa 2996 if (ctxt->ops->read_pmc(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &pmc))
222d21aa 2997 return emulate_gp(ctxt, 0);
dd856efa
AK		 2998 *reg_write(ctxt, VCPU_REGS_RAX) = (u32)pmc;
2999 *reg_write(ctxt, VCPU_REGS_RDX) = pmc >> 32;
222d21aa
AK		 3000 return X86EMUL_CONTINUE;
3001}
3002
b9eac5f4
AK		 3003static int em_mov(struct x86_emulate_ctxt *ctxt)
3004{
49597d81 3005 memcpy(ctxt->dst.valptr, ctxt->src.valptr, ctxt->op_bytes);
b9eac5f4
AK		 3006 return X86EMUL_CONTINUE;
3007}
3008
bc00f8d2
TY		 3009static int em_cr_write(struct x86_emulate_ctxt *ctxt)
3010{
3011 if (ctxt->ops->set_cr(ctxt, ctxt->modrm_reg, ctxt->src.val))
3012 return emulate_gp(ctxt, 0);
3013
3014 /* Disable writeback. */
3015 ctxt->dst.type = OP_NONE;
3016 return X86EMUL_CONTINUE;
3017}
3018
3019static int em_dr_write(struct x86_emulate_ctxt *ctxt)
3020{
3021 unsigned long val;
3022
3023 if (ctxt->mode == X86EMUL_MODE_PROT64)
3024 val = ctxt->src.val & ~0ULL;
3025 else
3026 val = ctxt->src.val & ~0U;
3027
3028 /* #UD condition is already handled. */
3029 if (ctxt->ops->set_dr(ctxt, ctxt->modrm_reg, val) < 0)
3030 return emulate_gp(ctxt, 0);
3031
3032 /* Disable writeback. */
3033 ctxt->dst.type = OP_NONE;
3034 return X86EMUL_CONTINUE;
3035}
3036
e1e210b0
TY		 3037static int em_wrmsr(struct x86_emulate_ctxt *ctxt)
3038{
3039 u64 msr_data;
3040
dd856efa
AK		 3041 msr_data = (u32)reg_read(ctxt, VCPU_REGS_RAX)
3042 | ((u64)reg_read(ctxt, VCPU_REGS_RDX) << 32);
3043 if (ctxt->ops->set_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), msr_data))
e1e210b0
TY		 3044 return emulate_gp(ctxt, 0);
3045
3046 return X86EMUL_CONTINUE;
3047}
3048
3049static int em_rdmsr(struct x86_emulate_ctxt *ctxt)
3050{
3051 u64 msr_data;
3052
dd856efa 3053 if (ctxt->ops->get_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &msr_data))
e1e210b0
TY		 3054 return emulate_gp(ctxt, 0);
3055
dd856efa
AK		 3056 *reg_write(ctxt, VCPU_REGS_RAX) = (u32)msr_data;
3057 *reg_write(ctxt, VCPU_REGS_RDX) = msr_data >> 32;
e1e210b0
TY		 3058 return X86EMUL_CONTINUE;
3059}
3060
1bd5f469
TY		 3061static int em_mov_rm_sreg(struct x86_emulate_ctxt *ctxt)
3062{
9dac77fa 3063 if (ctxt->modrm_reg > VCPU_SREG_GS)
1bd5f469
TY		 3064 return emulate_ud(ctxt);
3065
9dac77fa 3066 ctxt->dst.val = get_segment_selector(ctxt, ctxt->modrm_reg);
1bd5f469
TY		 3067 return X86EMUL_CONTINUE;
3068}
3069
3070static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt)
3071{
9dac77fa 3072 u16 sel = ctxt->src.val;
1bd5f469 3073
9dac77fa 3074 if (ctxt->modrm_reg == VCPU_SREG_CS || ctxt->modrm_reg > VCPU_SREG_GS)
1bd5f469
TY		 3075 return emulate_ud(ctxt);
3076
9dac77fa 3077 if (ctxt->modrm_reg == VCPU_SREG_SS)
1bd5f469
TY		 3078 ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS;
3079
3080 /* Disable writeback. */
9dac77fa
AK		 3081 ctxt->dst.type = OP_NONE;
3082 return load_segment_descriptor(ctxt, sel, ctxt->modrm_reg);
1bd5f469
TY		 3083}
3084
a14e579f
AK		 3085static int em_lldt(struct x86_emulate_ctxt *ctxt)
3086{
3087 u16 sel = ctxt->src.val;
3088
3089 /* Disable writeback. */
3090 ctxt->dst.type = OP_NONE;
3091 return load_segment_descriptor(ctxt, sel, VCPU_SREG_LDTR);
3092}
3093
80890006
AK		 3094static int em_ltr(struct x86_emulate_ctxt *ctxt)
3095{
3096 u16 sel = ctxt->src.val;
3097
3098 /* Disable writeback. */
3099 ctxt->dst.type = OP_NONE;
3100 return load_segment_descriptor(ctxt, sel, VCPU_SREG_TR);
3101}
3102
38503911
AK		 3103static int em_invlpg(struct x86_emulate_ctxt *ctxt)
3104{
9fa088f4
AK		 3105 int rc;
3106 ulong linear;
3107
9dac77fa 3108 rc = linearize(ctxt, ctxt->src.addr.mem, 1, false, &linear);
9fa088f4 3109 if (rc == X86EMUL_CONTINUE)
3cb16fe7 3110 ctxt->ops->invlpg(ctxt, linear);
38503911 3111 /* Disable writeback. */
9dac77fa 3112 ctxt->dst.type = OP_NONE;
38503911
AK		 3113 return X86EMUL_CONTINUE;
3114}
3115
2d04a05b
AK		 3116static int em_clts(struct x86_emulate_ctxt *ctxt)
3117{
3118 ulong cr0;
3119
3120 cr0 = ctxt->ops->get_cr(ctxt, 0);
3121 cr0 &= ~X86_CR0_TS;
3122 ctxt->ops->set_cr(ctxt, 0, cr0);
3123 return X86EMUL_CONTINUE;
3124}
3125
26d05cc7
AK		 3126static int em_vmcall(struct x86_emulate_ctxt *ctxt)
3127{
26d05cc7
AK		 3128 int rc;
3129
9dac77fa 3130 if (ctxt->modrm_mod != 3 || ctxt->modrm_rm != 1)
26d05cc7
AK		 3131 return X86EMUL_UNHANDLEABLE;
3132
3133 rc = ctxt->ops->fix_hypercall(ctxt);
3134 if (rc != X86EMUL_CONTINUE)
3135 return rc;
3136
3137 /* Let the processor re-execute the fixed hypercall */
9dac77fa 3138 ctxt->_eip = ctxt->eip;
26d05cc7 3139 /* Disable writeback. */
9dac77fa 3140 ctxt->dst.type = OP_NONE;
26d05cc7
AK		 3141 return X86EMUL_CONTINUE;
3142}
3143
96051572
AK		 3144static int emulate_store_desc_ptr(struct x86_emulate_ctxt *ctxt,
3145 void (*get)(struct x86_emulate_ctxt *ctxt,
3146 struct desc_ptr *ptr))
3147{
3148 struct desc_ptr desc_ptr;
3149
3150 if (ctxt->mode == X86EMUL_MODE_PROT64)
3151 ctxt->op_bytes = 8;
3152 get(ctxt, &desc_ptr);
3153 if (ctxt->op_bytes == 2) {
3154 ctxt->op_bytes = 4;
3155 desc_ptr.address &= 0x00ffffff;
3156 }
3157 /* Disable writeback. */
3158 ctxt->dst.type = OP_NONE;
3159 return segmented_write(ctxt, ctxt->dst.addr.mem,
3160 &desc_ptr, 2 + ctxt->op_bytes);
3161}
3162
3163static int em_sgdt(struct x86_emulate_ctxt *ctxt)
3164{
3165 return emulate_store_desc_ptr(ctxt, ctxt->ops->get_gdt);
3166}
3167
3168static int em_sidt(struct x86_emulate_ctxt *ctxt)
3169{
3170 return emulate_store_desc_ptr(ctxt, ctxt->ops->get_idt);
3171}
3172
26d05cc7
AK		 3173static int em_lgdt(struct x86_emulate_ctxt *ctxt)
3174{
26d05cc7
AK		 3175 struct desc_ptr desc_ptr;
3176 int rc;
3177
510425ff
AK		 3178 if (ctxt->mode == X86EMUL_MODE_PROT64)
3179 ctxt->op_bytes = 8;
9dac77fa 3180 rc = read_descriptor(ctxt, ctxt->src.addr.mem,
26d05cc7 3181 &desc_ptr.size, &desc_ptr.address,
9dac77fa 3182 ctxt->op_bytes);
26d05cc7
AK		 3183 if (rc != X86EMUL_CONTINUE)
3184 return rc;
3185 ctxt->ops->set_gdt(ctxt, &desc_ptr);
3186 /* Disable writeback. */
9dac77fa 3187 ctxt->dst.type = OP_NONE;
26d05cc7
AK		 3188 return X86EMUL_CONTINUE;
3189}
3190
5ef39c71 3191static int em_vmmcall(struct x86_emulate_ctxt *ctxt)
26d05cc7 3192{
26d05cc7
AK		 3193 int rc;
3194
5ef39c71
AK		 3195 rc = ctxt->ops->fix_hypercall(ctxt);
3196
26d05cc7 3197 /* Disable writeback. */
9dac77fa 3198 ctxt->dst.type = OP_NONE;
26d05cc7
AK		 3199 return rc;
3200}
3201
3202static int em_lidt(struct x86_emulate_ctxt *ctxt)
3203{
26d05cc7
AK		 3204 struct desc_ptr desc_ptr;
3205 int rc;
3206
510425ff
AK		 3207 if (ctxt->mode == X86EMUL_MODE_PROT64)
3208 ctxt->op_bytes = 8;
9dac77fa 3209 rc = read_descriptor(ctxt, ctxt->src.addr.mem,
509cf9fe 3210 &desc_ptr.size, &desc_ptr.address,
9dac77fa 3211 ctxt->op_bytes);
26d05cc7
AK		 3212 if (rc != X86EMUL_CONTINUE)
3213 return rc;
3214 ctxt->ops->set_idt(ctxt, &desc_ptr);
3215 /* Disable writeback. */
9dac77fa 3216 ctxt->dst.type = OP_NONE;
26d05cc7
AK		 3217 return X86EMUL_CONTINUE;
3218}
3219
3220static int em_smsw(struct x86_emulate_ctxt *ctxt)
3221{
9dac77fa
AK		 3222 ctxt->dst.bytes = 2;
3223 ctxt->dst.val = ctxt->ops->get_cr(ctxt, 0);
26d05cc7
AK		 3224 return X86EMUL_CONTINUE;
3225}
3226
3227static int em_lmsw(struct x86_emulate_ctxt *ctxt)
3228{
26d05cc7 3229 ctxt->ops->set_cr(ctxt, 0, (ctxt->ops->get_cr(ctxt, 0) & ~0x0eul)
9dac77fa
AK		 3230 | (ctxt->src.val & 0x0f));
3231 ctxt->dst.type = OP_NONE;
26d05cc7
AK		 3232 return X86EMUL_CONTINUE;
3233}
3234
d06e03ad
TY		 3235static int em_loop(struct x86_emulate_ctxt *ctxt)
3236{
dd856efa
AK		 3237 register_address_increment(ctxt, reg_rmw(ctxt, VCPU_REGS_RCX), -1);
3238 if ((address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) != 0) &&
9dac77fa
AK		 3239 (ctxt->b == 0xe2 || test_cc(ctxt->b ^ 0x5, ctxt->eflags)))
3240 jmp_rel(ctxt, ctxt->src.val);
d06e03ad
TY		 3241
3242 return X86EMUL_CONTINUE;
3243}
3244
3245static int em_jcxz(struct x86_emulate_ctxt *ctxt)
3246{
dd856efa 3247 if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0)
9dac77fa 3248 jmp_rel(ctxt, ctxt->src.val);
d06e03ad
TY		 3249
3250 return X86EMUL_CONTINUE;
3251}
3252
d7841a4b
TY		 3253static int em_in(struct x86_emulate_ctxt *ctxt)
3254{
3255 if (!pio_in_emulated(ctxt, ctxt->dst.bytes, ctxt->src.val,
3256 &ctxt->dst.val))
3257 return X86EMUL_IO_NEEDED;
3258
3259 return X86EMUL_CONTINUE;
3260}
3261
3262static int em_out(struct x86_emulate_ctxt *ctxt)
3263{
3264 ctxt->ops->pio_out_emulated(ctxt, ctxt->src.bytes, ctxt->dst.val,
3265 &ctxt->src.val, 1);
3266 /* Disable writeback. */
3267 ctxt->dst.type = OP_NONE;
3268 return X86EMUL_CONTINUE;
3269}
3270
f411e6cd
TY		 3271static int em_cli(struct x86_emulate_ctxt *ctxt)
3272{
3273 if (emulator_bad_iopl(ctxt))
3274 return emulate_gp(ctxt, 0);
3275
3276 ctxt->eflags &= ~X86_EFLAGS_IF;
3277 return X86EMUL_CONTINUE;
3278}
3279
3280static int em_sti(struct x86_emulate_ctxt *ctxt)
3281{
3282 if (emulator_bad_iopl(ctxt))
3283 return emulate_gp(ctxt, 0);
3284
3285 ctxt->interruptibility = KVM_X86_SHADOW_INT_STI;
3286 ctxt->eflags |= X86_EFLAGS_IF;
3287 return X86EMUL_CONTINUE;
3288}
3289
ce7faab2
TY		 3290static int em_bt(struct x86_emulate_ctxt *ctxt)
3291{
3292 /* Disable writeback. */
3293 ctxt->dst.type = OP_NONE;
3294 /* only subword offset */
3295 ctxt->src.val &= (ctxt->dst.bytes << 3) - 1;
3296
3297 emulate_2op_SrcV_nobyte(ctxt, "bt");
3298 return X86EMUL_CONTINUE;
3299}
3300
3301static int em_bts(struct x86_emulate_ctxt *ctxt)
3302{
3303 emulate_2op_SrcV_nobyte(ctxt, "bts");
3304 return X86EMUL_CONTINUE;
3305}
3306
3307static int em_btr(struct x86_emulate_ctxt *ctxt)
3308{
3309 emulate_2op_SrcV_nobyte(ctxt, "btr");
3310 return X86EMUL_CONTINUE;
3311}
3312
3313static int em_btc(struct x86_emulate_ctxt *ctxt)
3314{
3315 emulate_2op_SrcV_nobyte(ctxt, "btc");
3316 return X86EMUL_CONTINUE;
3317}
3318
ff227392
TY		 3319static int em_bsf(struct x86_emulate_ctxt *ctxt)
3320{
d54e4237 3321 emulate_2op_SrcV_nobyte(ctxt, "bsf");
ff227392
TY		 3322 return X86EMUL_CONTINUE;
3323}
3324
3325static int em_bsr(struct x86_emulate_ctxt *ctxt)
3326{
d54e4237 3327 emulate_2op_SrcV_nobyte(ctxt, "bsr");
ff227392
TY		 3328 return X86EMUL_CONTINUE;
3329}
3330
6d6eede4
AK		 3331static int em_cpuid(struct x86_emulate_ctxt *ctxt)
3332{
3333 u32 eax, ebx, ecx, edx;
3334
dd856efa
AK		 3335 eax = reg_read(ctxt, VCPU_REGS_RAX);
3336 ecx = reg_read(ctxt, VCPU_REGS_RCX);
6d6eede4 3337 ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
dd856efa
AK		 3338 *reg_write(ctxt, VCPU_REGS_RAX) = eax;
3339 *reg_write(ctxt, VCPU_REGS_RBX) = ebx;
3340 *reg_write(ctxt, VCPU_REGS_RCX) = ecx;
3341 *reg_write(ctxt, VCPU_REGS_RDX) = edx;
6d6eede4
AK		 3342 return X86EMUL_CONTINUE;
3343}
3344
2dd7caa0
AK		 3345static int em_lahf(struct x86_emulate_ctxt *ctxt)
3346{
dd856efa
AK		 3347 *reg_rmw(ctxt, VCPU_REGS_RAX) &= ~0xff00UL;
3348 *reg_rmw(ctxt, VCPU_REGS_RAX) |= (ctxt->eflags & 0xff) << 8;
2dd7caa0
AK		 3349 return X86EMUL_CONTINUE;
3350}
3351
9299836e
AK		 3352static int em_bswap(struct x86_emulate_ctxt *ctxt)
3353{
3354 switch (ctxt->op_bytes) {
3355#ifdef CONFIG_X86_64
3356 case 8:
3357 asm("bswap %0" : "+r"(ctxt->dst.val));
3358 break;
3359#endif
3360 default:
3361 asm("bswap %0" : "+r"(*(u32 *)&ctxt->dst.val));
3362 break;
3363 }
3364 return X86EMUL_CONTINUE;
3365}
3366
cfec82cb
JR		 3367static bool valid_cr(int nr)
3368{
3369 switch (nr) {
3370 case 0:
3371 case 2 ... 4:
3372 case 8:
3373 return true;
3374 default:
3375 return false;
3376 }
3377}
3378
3379static int check_cr_read(struct x86_emulate_ctxt *ctxt)
3380{
9dac77fa 3381 if (!valid_cr(ctxt->modrm_reg))
cfec82cb
JR		 3382 return emulate_ud(ctxt);
3383
3384 return X86EMUL_CONTINUE;
3385}
3386
3387static int check_cr_write(struct x86_emulate_ctxt *ctxt)
3388{
9dac77fa
AK		 3389 u64 new_val = ctxt->src.val64;
3390 int cr = ctxt->modrm_reg;
c2ad2bb3 3391 u64 efer = 0;
cfec82cb
JR		 3392
3393 static u64 cr_reserved_bits[] = {
3394 0xffffffff00000000ULL,
3395 0, 0, 0, /* CR3 checked later */
3396 CR4_RESERVED_BITS,
3397 0, 0, 0,
3398 CR8_RESERVED_BITS,
3399 };
3400
3401 if (!valid_cr(cr))
3402 return emulate_ud(ctxt);
3403
3404 if (new_val & cr_reserved_bits[cr])
3405 return emulate_gp(ctxt, 0);
3406
3407 switch (cr) {
3408 case 0: {
c2ad2bb3 3409 u64 cr4;
cfec82cb
JR		 3410 if (((new_val & X86_CR0_PG) && !(new_val & X86_CR0_PE)) ||
3411 ((new_val & X86_CR0_NW) && !(new_val & X86_CR0_CD)))
3412 return emulate_gp(ctxt, 0);
3413
717746e3
AK		 3414 cr4 = ctxt->ops->get_cr(ctxt, 4);
3415 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
cfec82cb
JR		 3416
3417 if ((new_val & X86_CR0_PG) && (efer & EFER_LME) &&
3418 !(cr4 & X86_CR4_PAE))
3419 return emulate_gp(ctxt, 0);
3420
3421 break;
3422 }
3423 case 3: {
3424 u64 rsvd = 0;
3425
c2ad2bb3
AK		 3426 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
3427 if (efer & EFER_LMA)
cfec82cb 3428 rsvd = CR3_L_MODE_RESERVED_BITS;
fd72c419 3429 else if (ctxt->ops->get_cr(ctxt, 4) & X86_CR4_PAE)
cfec82cb 3430 rsvd = CR3_PAE_RESERVED_BITS;
fd72c419 3431 else if (ctxt->ops->get_cr(ctxt, 0) & X86_CR0_PG)
cfec82cb
JR		 3432 rsvd = CR3_NONPAE_RESERVED_BITS;
3433
3434 if (new_val & rsvd)
3435 return emulate_gp(ctxt, 0);
3436
3437 break;
3438 }
3439 case 4: {
717746e3 3440 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
cfec82cb
JR		 3441
3442 if ((efer & EFER_LMA) && !(new_val & X86_CR4_PAE))
3443 return emulate_gp(ctxt, 0);
3444
3445 break;
3446 }
3447 }
3448
3449 return X86EMUL_CONTINUE;
3450}
3451
3b88e41a
JR		 3452static int check_dr7_gd(struct x86_emulate_ctxt *ctxt)
3453{
3454 unsigned long dr7;
3455
717746e3 3456 ctxt->ops->get_dr(ctxt, 7, &dr7);
3b88e41a
JR		 3457
3458 /* Check if DR7.Global_Enable is set */
3459 return dr7 & (1 << 13);
3460}
3461
3462static int check_dr_read(struct x86_emulate_ctxt *ctxt)
3463{
9dac77fa 3464 int dr = ctxt->modrm_reg;
3b88e41a
JR		 3465 u64 cr4;
3466
3467 if (dr > 7)
3468 return emulate_ud(ctxt);
3469
717746e3 3470 cr4 = ctxt->ops->get_cr(ctxt, 4);
3b88e41a
JR		 3471 if ((cr4 & X86_CR4_DE) && (dr == 4 || dr == 5))
3472 return emulate_ud(ctxt);
3473
3474 if (check_dr7_gd(ctxt))
3475 return emulate_db(ctxt);
3476
3477 return X86EMUL_CONTINUE;
3478}
3479
3480static int check_dr_write(struct x86_emulate_ctxt *ctxt)
3481{
9dac77fa
AK		 3482 u64 new_val = ctxt->src.val64;
3483 int dr = ctxt->modrm_reg;
3b88e41a
JR		 3484
3485 if ((dr == 6 || dr == 7) && (new_val & 0xffffffff00000000ULL))
3486 return emulate_gp(ctxt, 0);
3487
3488 return check_dr_read(ctxt);
3489}
3490
01de8b09
JR		 3491static int check_svme(struct x86_emulate_ctxt *ctxt)
3492{
3493 u64 efer;
3494
717746e3 3495 ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
01de8b09
JR		 3496
3497 if (!(efer & EFER_SVME))
3498 return emulate_ud(ctxt);
3499
3500 return X86EMUL_CONTINUE;
3501}
3502
3503static int check_svme_pa(struct x86_emulate_ctxt *ctxt)
3504{
dd856efa 3505 u64 rax = reg_read(ctxt, VCPU_REGS_RAX);
01de8b09
JR		 3506
3507 /* Valid physical address? */
d4224449 3508 if (rax & 0xffff000000000000ULL)
01de8b09
JR		 3509 return emulate_gp(ctxt, 0);
3510
3511 return check_svme(ctxt);
3512}
3513
d7eb8203
JR		 3514static int check_rdtsc(struct x86_emulate_ctxt *ctxt)
3515{
717746e3 3516 u64 cr4 = ctxt->ops->get_cr(ctxt, 4);
d7eb8203 3517
717746e3 3518 if (cr4 & X86_CR4_TSD && ctxt->ops->cpl(ctxt))
d7eb8203
JR		 3519 return emulate_ud(ctxt);
3520
3521 return X86EMUL_CONTINUE;
3522}
3523
8061252e
JR		 3524static int check_rdpmc(struct x86_emulate_ctxt *ctxt)
3525{
717746e3 3526 u64 cr4 = ctxt->ops->get_cr(ctxt, 4);
dd856efa 3527 u64 rcx = reg_read(ctxt, VCPU_REGS_RCX);
8061252e 3528
717746e3 3529 if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt)) ||
8061252e
JR		 3530 (rcx > 3))
3531 return emulate_gp(ctxt, 0);
3532
3533 return X86EMUL_CONTINUE;
3534}
3535
f6511935
JR		 3536static int check_perm_in(struct x86_emulate_ctxt *ctxt)
3537{
9dac77fa
AK		 3538 ctxt->dst.bytes = min(ctxt->dst.bytes, 4u);
3539 if (!emulator_io_permited(ctxt, ctxt->src.val, ctxt->dst.bytes))
f6511935
JR		 3540 return emulate_gp(ctxt, 0);
3541
3542 return X86EMUL_CONTINUE;
3543}
3544
3545static int check_perm_out(struct x86_emulate_ctxt *ctxt)
3546{
9dac77fa
AK		 3547 ctxt->src.bytes = min(ctxt->src.bytes, 4u);
3548 if (!emulator_io_permited(ctxt, ctxt->dst.val, ctxt->src.bytes))
f6511935
JR		 3549 return emulate_gp(ctxt, 0);
3550
3551 return X86EMUL_CONTINUE;
3552}
3553
73fba5f4 3554#define D(_y) { .flags = (_y) }
c4f035c6 3555#define DI(_y, _i) { .flags = (_y), .intercept = x86_intercept_##_i }
d09beabd
JR		 3556#define DIP(_y, _i, _p) { .flags = (_y), .intercept = x86_intercept_##_i, \
3557 .check_perm = (_p) }
73fba5f4 3558#define N D(0)
01de8b09 3559#define EXT(_f, _e) { .flags = ((_f) | RMExt), .u.group = (_e) }
1c2545be
TY		 3560#define G(_f, _g) { .flags = ((_f) | Group | ModRM), .u.group = (_g) }
3561#define GD(_f, _g) { .flags = ((_f) | GroupDual | ModRM), .u.gdual = (_g) }
73fba5f4 3562#define I(_f, _e) { .flags = (_f), .u.execute = (_e) }
c4f035c6
AK		 3563#define II(_f, _e, _i) \
3564 { .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i }
d09beabd
JR		 3565#define IIP(_f, _e, _i, _p) \
3566 { .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i, \
3567 .check_perm = (_p) }
aa97bb48 3568#define GP(_f, _g) { .flags = ((_f) | Prefix), .u.gprefix = (_g) }
73fba5f4 3569
8d8f4e9f 3570#define D2bv(_f) D((_f) | ByteOp), D(_f)
f6511935 3571#define D2bvIP(_f, _i, _p) DIP((_f) | ByteOp, _i, _p), DIP(_f, _i, _p)
8d8f4e9f 3572#define I2bv(_f, _e) I((_f) | ByteOp, _e), I(_f, _e)
d7841a4b
TY		 3573#define I2bvIP(_f, _e, _i, _p) \
3574 IIP((_f) | ByteOp, _e, _i, _p), IIP(_f, _e, _i, _p)
8d8f4e9f 3575
d67fc27a
TY		 3576#define I6ALU(_f, _e) I2bv((_f) | DstMem | SrcReg | ModRM, _e), \
3577 I2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock, _e), \
3578 I2bv(((_f) & ~Lock) | DstAcc | SrcImm, _e)
6230f7fc 3579
d7eb8203 3580static struct opcode group7_rm1[] = {
1c2545be
TY		 3581 DI(SrcNone | Priv, monitor),
3582 DI(SrcNone | Priv, mwait),
d7eb8203
JR		 3583 N, N, N, N, N, N,
3584};
3585
01de8b09 3586static struct opcode group7_rm3[] = {
1c2545be
TY		 3587 DIP(SrcNone | Prot | Priv, vmrun, check_svme_pa),
3588 II(SrcNone | Prot | VendorSpecific, em_vmmcall, vmmcall),
3589 DIP(SrcNone | Prot | Priv, vmload, check_svme_pa),
3590 DIP(SrcNone | Prot | Priv, vmsave, check_svme_pa),
3591 DIP(SrcNone | Prot | Priv, stgi, check_svme),
3592 DIP(SrcNone | Prot | Priv, clgi, check_svme),
3593 DIP(SrcNone | Prot | Priv, skinit, check_svme),
3594 DIP(SrcNone | Prot | Priv, invlpga, check_svme),
01de8b09 3595};
6230f7fc 3596
d7eb8203
JR		 3597static struct opcode group7_rm7[] = {
3598 N,
1c2545be 3599 DIP(SrcNone, rdtscp, check_rdtsc),
d7eb8203
JR		 3600 N, N, N, N, N, N,
3601};
d67fc27a 3602
73fba5f4 3603static struct opcode group1[] = {
d67fc27a 3604 I(Lock, em_add),
d5ae7ce8 3605 I(Lock | PageTable, em_or),
d67fc27a
TY		 3606 I(Lock, em_adc),
3607 I(Lock, em_sbb),
d5ae7ce8 3608 I(Lock | PageTable, em_and),
d67fc27a
TY		 3609 I(Lock, em_sub),
3610 I(Lock, em_xor),
3611 I(0, em_cmp),
73fba5f4
AK		 3612};
3613
3614static struct opcode group1A[] = {
1c2545be 3615 I(DstMem | SrcNone | Mov | Stack, em_pop), N, N, N, N, N, N, N,
73fba5f4
AK		 3616};
3617
3618static struct opcode group3[] = {
1c2545be
TY		 3619 I(DstMem | SrcImm, em_test),
3620 I(DstMem | SrcImm, em_test),
3621 I(DstMem | SrcNone | Lock, em_not),
3622 I(DstMem | SrcNone | Lock, em_neg),
3623 I(SrcMem, em_mul_ex),
3624 I(SrcMem, em_imul_ex),
3625 I(SrcMem, em_div_ex),
3626 I(SrcMem, em_idiv_ex),
73fba5f4
AK		 3627};
3628
3629static struct opcode group4[] = {
1c2545be
TY		 3630 I(ByteOp | DstMem | SrcNone | Lock, em_grp45),
3631 I(ByteOp | DstMem | SrcNone | Lock, em_grp45),
73fba5f4
AK		 3632 N, N, N, N, N, N,
3633};
3634
3635static struct opcode group5[] = {
1c2545be
TY		 3636 I(DstMem | SrcNone | Lock, em_grp45),
3637 I(DstMem | SrcNone | Lock, em_grp45),
3638 I(SrcMem | Stack, em_grp45),
3639 I(SrcMemFAddr | ImplicitOps | Stack, em_call_far),
3640 I(SrcMem | Stack, em_grp45),
3641 I(SrcMemFAddr | ImplicitOps, em_grp45),
3642 I(SrcMem | Stack, em_grp45), N,
73fba5f4
AK		 3643};
3644
dee6bb70 3645static struct opcode group6[] = {
1c2545be
TY		 3646 DI(Prot, sldt),
3647 DI(Prot, str),
a14e579f 3648 II(Prot | Priv | SrcMem16, em_lldt, lldt),
80890006 3649 II(Prot | Priv | SrcMem16, em_ltr, ltr),
dee6bb70
JR		 3650 N, N, N, N,
3651};
3652
73fba5f4 3653static struct group_dual group7 = { {
96051572
AK		 3654 II(Mov | DstMem | Priv, em_sgdt, sgdt),
3655 II(Mov | DstMem | Priv, em_sidt, sidt),
1c2545be
TY		 3656 II(SrcMem | Priv, em_lgdt, lgdt),
3657 II(SrcMem | Priv, em_lidt, lidt),
3658 II(SrcNone | DstMem | Mov, em_smsw, smsw), N,
3659 II(SrcMem16 | Mov | Priv, em_lmsw, lmsw),
3660 II(SrcMem | ByteOp | Priv | NoAccess, em_invlpg, invlpg),
73fba5f4 3661}, {
1c2545be 3662 I(SrcNone | Priv | VendorSpecific, em_vmcall),
5ef39c71 3663 EXT(0, group7_rm1),
01de8b09 3664 N, EXT(0, group7_rm3),
1c2545be
TY		 3665 II(SrcNone | DstMem | Mov, em_smsw, smsw), N,
3666 II(SrcMem16 | Mov | Priv, em_lmsw, lmsw),
3667 EXT(0, group7_rm7),
73fba5f4
AK		 3668} };
3669
3670static struct opcode group8[] = {
3671 N, N, N, N,
1c2545be
TY		 3672 I(DstMem | SrcImmByte, em_bt),
3673 I(DstMem | SrcImmByte | Lock | PageTable, em_bts),
3674 I(DstMem | SrcImmByte | Lock, em_btr),
3675 I(DstMem | SrcImmByte | Lock | PageTable, em_btc),
73fba5f4
AK		 3676};
3677
3678static struct group_dual group9 = { {
1c2545be 3679 N, I(DstMem64 | Lock | PageTable, em_cmpxchg8b), N, N, N, N, N, N,
73fba5f4
AK		 3680}, {
3681 N, N, N, N, N, N, N, N,
3682} };
3683
a4d4a7c1 3684static struct opcode group11[] = {
1c2545be 3685 I(DstMem | SrcImm | Mov | PageTable, em_mov),
d5ae7ce8 3686 X7(D(Undefined)),
a4d4a7c1
AK		 3687};
3688
aa97bb48 3689static struct gprefix pfx_0f_6f_0f_7f = {
e5971755 3690 I(Mmx, em_mov), I(Sse | Aligned, em_mov), N, I(Sse | Unaligned, em_mov),
aa97bb48
AK		 3691};
3692
3e114eb4
AK		 3693static struct gprefix pfx_vmovntpx = {
3694 I(0, em_mov), N, N, N,
3695};
3696
73fba5f4
AK		 3697static struct opcode opcode_table[256] = {
3698 /* 0x00 - 0x07 */
d67fc27a 3699 I6ALU(Lock, em_add),
1cd196ea
AK		 3700 I(ImplicitOps | Stack | No64 | Src2ES, em_push_sreg),
3701 I(ImplicitOps | Stack | No64 | Src2ES, em_pop_sreg),
73fba5f4 3702 /* 0x08 - 0x0F */
d5ae7ce8 3703 I6ALU(Lock | PageTable, em_or),
1cd196ea
AK		 3704 I(ImplicitOps | Stack | No64 | Src2CS, em_push_sreg),
3705 N,
73fba5f4 3706 /* 0x10 - 0x17 */
d67fc27a 3707 I6ALU(Lock, em_adc),
1cd196ea
AK		 3708 I(ImplicitOps | Stack | No64 | Src2SS, em_push_sreg),
3709 I(ImplicitOps | Stack | No64 | Src2SS, em_pop_sreg),
73fba5f4 3710 /* 0x18 - 0x1F */
d67fc27a 3711 I6ALU(Lock, em_sbb),
1cd196ea
AK		 3712 I(ImplicitOps | Stack | No64 | Src2DS, em_push_sreg),
3713 I(ImplicitOps | Stack | No64 | Src2DS, em_pop_sreg),
73fba5f4 3714 /* 0x20 - 0x27 */
d5ae7ce8 3715 I6ALU(Lock | PageTable, em_and), N, N,
73fba5f4 3716 /* 0x28 - 0x2F */
d67fc27a 3717 I6ALU(Lock, em_sub), N, I(ByteOp | DstAcc | No64, em_das),
73fba5f4 3718 /* 0x30 - 0x37 */
d67fc27a 3719 I6ALU(Lock, em_xor), N, N,
73fba5f4 3720 /* 0x38 - 0x3F */
d67fc27a 3721 I6ALU(0, em_cmp), N, N,
73fba5f4
AK		 3722 /* 0x40 - 0x4F */
3723 X16(D(DstReg)),
3724 /* 0x50 - 0x57 */
63540382 3725 X8(I(SrcReg | Stack, em_push)),
73fba5f4 3726 /* 0x58 - 0x5F */
c54fe504 3727 X8(I(DstReg | Stack, em_pop)),
73fba5f4 3728 /* 0x60 - 0x67 */
b96a7fad
TY		 3729 I(ImplicitOps | Stack | No64, em_pusha),
3730 I(ImplicitOps | Stack | No64, em_popa),
73fba5f4
AK		 3731 N, D(DstReg | SrcMem32 | ModRM | Mov) /* movsxd (x86/64) */ ,
3732 N, N, N, N,
3733 /* 0x68 - 0x6F */
d46164db
AK		 3734 I(SrcImm | Mov | Stack, em_push),
3735 I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op),
f3a1b9f4
AK		 3736 I(SrcImmByte | Mov | Stack, em_push),
3737 I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op),
2b5e97e1
TY		 3738 I2bvIP(DstDI | SrcDX | Mov | String, em_in, ins, check_perm_in), /* insb, insw/insd */
3739 I2bvIP(SrcSI | DstDX | String, em_out, outs, check_perm_out), /* outsb, outsw/outsd */
73fba5f4
AK		 3740 /* 0x70 - 0x7F */
3741 X16(D(SrcImmByte)),
3742 /* 0x80 - 0x87 */
1c2545be
TY		 3743 G(ByteOp | DstMem | SrcImm, group1),
3744 G(DstMem | SrcImm, group1),
3745 G(ByteOp | DstMem | SrcImm | No64, group1),
3746 G(DstMem | SrcImmByte, group1),
9f21ca59 3747 I2bv(DstMem | SrcReg | ModRM, em_test),
d5ae7ce8 3748 I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_xchg),
73fba5f4 3749 /* 0x88 - 0x8F */
d5ae7ce8 3750 I2bv(DstMem | SrcReg | ModRM | Mov | PageTable, em_mov),
b9eac5f4 3751 I2bv(DstReg | SrcMem | ModRM | Mov, em_mov),
d5ae7ce8 3752 I(DstMem | SrcNone | ModRM | Mov | PageTable, em_mov_rm_sreg),
1bd5f469
TY		 3753 D(ModRM | SrcMem | NoAccess | DstReg),
3754 I(ImplicitOps | SrcMem16 | ModRM, em_mov_sreg_rm),
3755 G(0, group1A),
73fba5f4 3756 /* 0x90 - 0x97 */
bf608f88 3757 DI(SrcAcc | DstReg, pause), X7(D(SrcAcc | DstReg)),
73fba5f4 3758 /* 0x98 - 0x9F */
61429142 3759 D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd),
cc4feed5 3760 I(SrcImmFAddr | No64, em_call_far), N,
62aaa2f0 3761 II(ImplicitOps | Stack, em_pushf, pushf),
2dd7caa0 3762 II(ImplicitOps | Stack, em_popf, popf), N, I(ImplicitOps, em_lahf),
73fba5f4 3763 /* 0xA0 - 0xA7 */
b9eac5f4 3764 I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),
d5ae7ce8 3765 I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov),
b9eac5f4 3766 I2bv(SrcSI | DstDI | Mov | String, em_mov),
d67fc27a 3767 I2bv(SrcSI | DstDI | String, em_cmp),
73fba5f4 3768 /* 0xA8 - 0xAF */
9f21ca59 3769 I2bv(DstAcc | SrcImm, em_test),
b9eac5f4
AK		 3770 I2bv(SrcAcc | DstDI | Mov | String, em_mov),
3771 I2bv(SrcSI | DstAcc | Mov | String, em_mov),
d67fc27a 3772 I2bv(SrcAcc | DstDI | String, em_cmp),
73fba5f4 3773 /* 0xB0 - 0xB7 */
b9eac5f4 3774 X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)),
73fba5f4 3775 /* 0xB8 - 0xBF */
b9eac5f4 3776 X8(I(DstReg | SrcImm | Mov, em_mov)),
73fba5f4 3777 /* 0xC0 - 0xC7 */
d2c6c7ad 3778 D2bv(DstMem | SrcImmByte | ModRM),
40ece7c7 3779 I(ImplicitOps | Stack | SrcImmU16, em_ret_near_imm),
ebda02c2 3780 I(ImplicitOps | Stack, em_ret),
d4b4325f
AK		 3781 I(DstReg | SrcMemFAddr | ModRM | No64 | Src2ES, em_lseg),
3782 I(DstReg | SrcMemFAddr | ModRM | No64 | Src2DS, em_lseg),
a4d4a7c1 3783 G(ByteOp, group11), G(0, group11),
73fba5f4 3784 /* 0xC8 - 0xCF */
612e89f0
AK		 3785 I(Stack | SrcImmU16 | Src2ImmByte, em_enter), I(Stack, em_leave),
3786 N, I(ImplicitOps | Stack, em_ret_far),
3c6e276f 3787 D(ImplicitOps), DI(SrcImmByte, intn),
db5b0762 3788 D(ImplicitOps | No64), II(ImplicitOps, em_iret, iret),
73fba5f4 3789 /* 0xD0 - 0xD7 */
d2c6c7ad 3790 D2bv(DstMem | SrcOne | ModRM), D2bv(DstMem | ModRM),
73fba5f4
AK		 3791 N, N, N, N,
3792 /* 0xD8 - 0xDF */
3793 N, N, N, N, N, N, N, N,
3794 /* 0xE0 - 0xE7 */
d06e03ad
TY		 3795 X3(I(SrcImmByte, em_loop)),
3796 I(SrcImmByte, em_jcxz),
d7841a4b
TY		 3797 I2bvIP(SrcImmUByte | DstAcc, em_in, in, check_perm_in),
3798 I2bvIP(SrcAcc | DstImmUByte, em_out, out, check_perm_out),
73fba5f4 3799 /* 0xE8 - 0xEF */
d4ddafcd 3800 I(SrcImm | Stack, em_call), D(SrcImm | ImplicitOps),
db5b0762 3801 I(SrcImmFAddr | No64, em_jmp_far), D(SrcImmByte | ImplicitOps),
d7841a4b
TY		 3802 I2bvIP(SrcDX | DstAcc, em_in, in, check_perm_in),
3803 I2bvIP(SrcAcc | DstDX, em_out, out, check_perm_out),
73fba5f4 3804 /* 0xF0 - 0xF7 */
bf608f88 3805 N, DI(ImplicitOps, icebp), N, N,
3c6e276f
AK		 3806 DI(ImplicitOps | Priv, hlt), D(ImplicitOps),
3807 G(ByteOp, group3), G(0, group3),
73fba5f4 3808 /* 0xF8 - 0xFF */
f411e6cd
TY		 3809 D(ImplicitOps), D(ImplicitOps),
3810 I(ImplicitOps, em_cli), I(ImplicitOps, em_sti),
73fba5f4
AK		 3811 D(ImplicitOps), D(ImplicitOps), G(0, group4), G(0, group5),
3812};
3813
3814static struct opcode twobyte_table[256] = {
3815 /* 0x00 - 0x0F */
dee6bb70 3816 G(0, group6), GD(0, &group7), N, N,
db5b0762
TY		 3817 N, I(ImplicitOps | VendorSpecific, em_syscall),
3818 II(ImplicitOps | Priv, em_clts, clts), N,
3c6e276f 3819 DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N,
73fba5f4
AK		 3820 N, D(ImplicitOps | ModRM), N, N,
3821 /* 0x10 - 0x1F */
3822 N, N, N, N, N, N, N, N, D(ImplicitOps | ModRM), N, N, N, N, N, N, N,
3823 /* 0x20 - 0x2F */
cfec82cb 3824 DIP(ModRM | DstMem | Priv | Op3264, cr_read, check_cr_read),
3b88e41a 3825 DIP(ModRM | DstMem | Priv | Op3264, dr_read, check_dr_read),
bc00f8d2
TY		 3826 IIP(ModRM | SrcMem | Priv | Op3264, em_cr_write, cr_write, check_cr_write),
3827 IIP(ModRM | SrcMem | Priv | Op3264, em_dr_write, dr_write, check_dr_write),
73fba5f4 3828 N, N, N, N,
3e114eb4
AK		 3829 N, N, N, GP(ModRM | DstMem | SrcReg | Sse | Mov | Aligned, &pfx_vmovntpx),
3830 N, N, N, N,
73fba5f4 3831 /* 0x30 - 0x3F */
e1e210b0 3832 II(ImplicitOps | Priv, em_wrmsr, wrmsr),
8061252e 3833 IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc),
e1e210b0 3834 II(ImplicitOps | Priv, em_rdmsr, rdmsr),
222d21aa 3835 IIP(ImplicitOps, em_rdpmc, rdpmc, check_rdpmc),
db5b0762
TY		 3836 I(ImplicitOps | VendorSpecific, em_sysenter),
3837 I(ImplicitOps | Priv | VendorSpecific, em_sysexit),
d867162c 3838 N, N,
73fba5f4
AK		 3839 N, N, N, N, N, N, N, N,
3840 /* 0x40 - 0x4F */
3841 X16(D(DstReg | SrcMem | ModRM | Mov)),
3842 /* 0x50 - 0x5F */
3843 N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
3844 /* 0x60 - 0x6F */
aa97bb48
AK		 3845 N, N, N, N,
3846 N, N, N, N,
3847 N, N, N, N,
3848 N, N, N, GP(SrcMem | DstReg | ModRM | Mov, &pfx_0f_6f_0f_7f),
73fba5f4 3849 /* 0x70 - 0x7F */
aa97bb48
AK		 3850 N, N, N, N,
3851 N, N, N, N,
3852 N, N, N, N,
3853 N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f),
73fba5f4
AK		 3854 /* 0x80 - 0x8F */
3855 X16(D(SrcImm)),
3856 /* 0x90 - 0x9F */
ee45b58e 3857 X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)),
73fba5f4 3858 /* 0xA0 - 0xA7 */
1cd196ea 3859 I(Stack | Src2FS, em_push_sreg), I(Stack | Src2FS, em_pop_sreg),
6d6eede4 3860 II(ImplicitOps, em_cpuid, cpuid), I(DstMem | SrcReg | ModRM | BitOp, em_bt),
73fba5f4
AK		 3861 D(DstMem | SrcReg | Src2ImmByte | ModRM),
3862 D(DstMem | SrcReg | Src2CL | ModRM), N, N,
3863 /* 0xA8 - 0xAF */
1cd196ea 3864 I(Stack | Src2GS, em_push_sreg), I(Stack | Src2GS, em_pop_sreg),
d5ae7ce8 3865 DI(ImplicitOps, rsm),
ce7faab2 3866 I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_bts),
73fba5f4
AK		 3867 D(DstMem | SrcReg | Src2ImmByte | ModRM),
3868 D(DstMem | SrcReg | Src2CL | ModRM),
5c82aa29 3869 D(ModRM), I(DstReg | SrcMem | ModRM, em_imul),
73fba5f4 3870 /* 0xB0 - 0xB7 */
e940b5c2 3871 I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_cmpxchg),
d4b4325f 3872 I(DstReg | SrcMemFAddr | ModRM | Src2SS, em_lseg),
ce7faab2 3873 I(DstMem | SrcReg | ModRM | BitOp | Lock, em_btr),
d4b4325f
AK		 3874 I(DstReg | SrcMemFAddr | ModRM | Src2FS, em_lseg),
3875 I(DstReg | SrcMemFAddr | ModRM | Src2GS, em_lseg),
2adb5ad9 3876 D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
73fba5f4
AK		 3877 /* 0xB8 - 0xBF */
3878 N, N,
ce7faab2
TY		 3879 G(BitOp, group8),
3880 I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc),
ff227392 3881 I(DstReg | SrcMem | ModRM, em_bsf), I(DstReg | SrcMem | ModRM, em_bsr),
2adb5ad9 3882 D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
9299836e 3883 /* 0xC0 - 0xC7 */
739ae406 3884 D2bv(DstMem | SrcReg | ModRM | Lock),
92f738a5 3885 N, D(DstMem | SrcReg | ModRM | Mov),
73fba5f4 3886 N, N, N, GD(0, &group9),
9299836e
AK		 3887 /* 0xC8 - 0xCF */
3888 X8(I(DstReg, em_bswap)),
73fba5f4
AK		 3889 /* 0xD0 - 0xDF */
3890 N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
3891 /* 0xE0 - 0xEF */
3892 N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
3893 /* 0xF0 - 0xFF */
3894 N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N
3895};
3896
3897#undef D
3898#undef N
3899#undef G
3900#undef GD
3901#undef I
aa97bb48 3902#undef GP
01de8b09 3903#undef EXT
73fba5f4 3904
8d8f4e9f 3905#undef D2bv
f6511935 3906#undef D2bvIP
8d8f4e9f 3907#undef I2bv
d7841a4b 3908#undef I2bvIP
d67fc27a 3909#undef I6ALU
8d8f4e9f 3910
9dac77fa 3911static unsigned imm_size(struct x86_emulate_ctxt *ctxt)
39f21ee5
AK		 3912{
3913 unsigned size;
3914
9dac77fa 3915 size = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
39f21ee5
AK		 3916 if (size == 8)
3917 size = 4;
3918 return size;
3919}
3920
3921static int decode_imm(struct x86_emulate_ctxt *ctxt, struct operand *op,
3922 unsigned size, bool sign_extension)
3923{
39f21ee5
AK		 3924 int rc = X86EMUL_CONTINUE;
3925
3926 op->type = OP_IMM;
3927 op->bytes = size;
9dac77fa 3928 op->addr.mem.ea = ctxt->_eip;
39f21ee5
AK		 3929 /* NB. Immediates are sign-extended as necessary. */
3930 switch (op->bytes) {
3931 case 1:
e85a1085 3932 op->val = insn_fetch(s8, ctxt);
39f21ee5
AK		 3933 break;
3934 case 2:
e85a1085 3935 op->val = insn_fetch(s16, ctxt);
39f21ee5
AK		 3936 break;
3937 case 4:
e85a1085 3938 op->val = insn_fetch(s32, ctxt);
39f21ee5
AK		 3939 break;
3940 }
3941 if (!sign_extension) {
3942 switch (op->bytes) {
3943 case 1:
3944 op->val &= 0xff;
3945 break;
3946 case 2:
3947 op->val &= 0xffff;
3948 break;
3949 case 4:
3950 op->val &= 0xffffffff;
3951 break;
3952 }
3953 }
3954done:
3955 return rc;
3956}
3957
a9945549
AK		 3958static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
3959 unsigned d)
3960{
3961 int rc = X86EMUL_CONTINUE;
3962
3963 switch (d) {
3964 case OpReg:
2adb5ad9 3965 decode_register_operand(ctxt, op);
a9945549
AK		 3966 break;
3967 case OpImmUByte:
608aabe3 3968 rc = decode_imm(ctxt, op, 1, false);
a9945549
AK		 3969 break;
3970 case OpMem:
41ddf978 3971 ctxt->memop.bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
0fe59128
AK		 3972 mem_common:
3973 *op = ctxt->memop;
3974 ctxt->memopp = op;
3975 if ((ctxt->d & BitOp) && op == &ctxt->dst)
a9945549
AK		 3976 fetch_bit_operand(ctxt);
3977 op->orig_val = op->val;
3978 break;
41ddf978
AK		 3979 case OpMem64:
3980 ctxt->memop.bytes = 8;
3981 goto mem_common;
a9945549
AK		 3982 case OpAcc:
3983 op->type = OP_REG;
3984 op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
dd856efa 3985 op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX);
a9945549
AK		 3986 fetch_register_operand(op);
3987 op->orig_val = op->val;
3988 break;
3989 case OpDI:
3990 op->type = OP_MEM;
3991 op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
3992 op->addr.mem.ea =
dd856efa 3993 register_address(ctxt, reg_read(ctxt, VCPU_REGS_RDI));
a9945549
AK		 3994 op->addr.mem.seg = VCPU_SREG_ES;
3995 op->val = 0;
3996 break;
3997 case OpDX:
3998 op->type = OP_REG;
3999 op->bytes = 2;
dd856efa 4000 op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX);
a9945549
AK		 4001 fetch_register_operand(op);
4002 break;
4dd6a57d
AK		 4003 case OpCL:
4004 op->bytes = 1;
dd856efa 4005 op->val = reg_read(ctxt, VCPU_REGS_RCX) & 0xff;
4dd6a57d
AK		 4006 break;
4007 case OpImmByte:
4008 rc = decode_imm(ctxt, op, 1, true);
4009 break;
4010 case OpOne:
4011 op->bytes = 1;
4012 op->val = 1;
4013 break;
4014 case OpImm:
4015 rc = decode_imm(ctxt, op, imm_size(ctxt), true);
4016 break;
28867cee
AK		 4017 case OpMem8:
4018 ctxt->memop.bytes = 1;
4019 goto mem_common;
0fe59128
AK		 4020 case OpMem16:
4021 ctxt->memop.bytes = 2;
4022 goto mem_common;
4023 case OpMem32:
4024 ctxt->memop.bytes = 4;
4025 goto mem_common;
4026 case OpImmU16:
4027 rc = decode_imm(ctxt, op, 2, false);
4028 break;
4029 case OpImmU:
4030 rc = decode_imm(ctxt, op, imm_size(ctxt), false);
4031 break;
4032 case OpSI:
4033 op->type = OP_MEM;
4034 op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
4035 op->addr.mem.ea =
dd856efa 4036 register_address(ctxt, reg_read(ctxt, VCPU_REGS_RSI));
0fe59128
AK		 4037 op->addr.mem.seg = seg_override(ctxt);
4038 op->val = 0;
4039 break;
4040 case OpImmFAddr:
4041 op->type = OP_IMM;
4042 op->addr.mem.ea = ctxt->_eip;
4043 op->bytes = ctxt->op_bytes + 2;
4044 insn_fetch_arr(op->valptr, op->bytes, ctxt);
4045 break;
4046 case OpMemFAddr:
4047 ctxt->memop.bytes = ctxt->op_bytes + 2;
4048 goto mem_common;
c191a7a0
AK		 4049 case OpES:
4050 op->val = VCPU_SREG_ES;
4051 break;
4052 case OpCS:
4053 op->val = VCPU_SREG_CS;
4054 break;
4055 case OpSS:
4056 op->val = VCPU_SREG_SS;
4057 break;
4058 case OpDS:
4059 op->val = VCPU_SREG_DS;
4060 break;
4061 case OpFS:
4062 op->val = VCPU_SREG_FS;
4063 break;
4064 case OpGS:
4065 op->val = VCPU_SREG_GS;
4066 break;
a9945549
AK		 4067 case OpImplicit:
4068 /* Special instructions do their own operand decoding. */
4069 default:
4070 op->type = OP_NONE; /* Disable writeback. */
4071 break;
4072 }
4073
4074done:
4075 return rc;
4076}
4077
ef5d75cc 4078int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
dde7e6d1 4079{
dde7e6d1
AK		 4080 int rc = X86EMUL_CONTINUE;
4081 int mode = ctxt->mode;
46561646 4082 int def_op_bytes, def_ad_bytes, goffset, simd_prefix;
0d7cdee8 4083 bool op_prefix = false;
46561646 4084 struct opcode opcode;
dde7e6d1 4085
f09ed83e
AK		 4086 ctxt->memop.type = OP_NONE;
4087 ctxt->memopp = NULL;
9dac77fa
AK		 4088 ctxt->_eip = ctxt->eip;
4089 ctxt->fetch.start = ctxt->_eip;
4090 ctxt->fetch.end = ctxt->fetch.start + insn_len;
dc25e89e 4091 if (insn_len > 0)
9dac77fa 4092 memcpy(ctxt->fetch.data, insn, insn_len);
dde7e6d1
AK		 4093
4094 switch (mode) {
4095 case X86EMUL_MODE_REAL:
4096 case X86EMUL_MODE_VM86:
4097 case X86EMUL_MODE_PROT16:
4098 def_op_bytes = def_ad_bytes = 2;
4099 break;
4100 case X86EMUL_MODE_PROT32:
4101 def_op_bytes = def_ad_bytes = 4;
4102 break;
4103#ifdef CONFIG_X86_64
4104 case X86EMUL_MODE_PROT64:
4105 def_op_bytes = 4;
4106 def_ad_bytes = 8;
4107 break;
4108#endif
4109 default:
1d2887e2 4110 return EMULATION_FAILED;
dde7e6d1
AK		 4111 }
4112
9dac77fa
AK		 4113 ctxt->op_bytes = def_op_bytes;
4114 ctxt->ad_bytes = def_ad_bytes;
dde7e6d1
AK		 4115
4116 /* Legacy prefixes. */
4117 for (;;) {
e85a1085 4118 switch (ctxt->b = insn_fetch(u8, ctxt)) {
dde7e6d1 4119 case 0x66: /* operand-size override */
0d7cdee8 4120 op_prefix = true;
dde7e6d1 4121 /* switch between 2/4 bytes */
9dac77fa 4122 ctxt->op_bytes = def_op_bytes ^ 6;
dde7e6d1
AK		 4123 break;
4124 case 0x67: /* address-size override */
4125 if (mode == X86EMUL_MODE_PROT64)
4126 /* switch between 4/8 bytes */
9dac77fa 4127 ctxt->ad_bytes = def_ad_bytes ^ 12;
dde7e6d1
AK		 4128 else
4129 /* switch between 2/4 bytes */
9dac77fa 4130 ctxt->ad_bytes = def_ad_bytes ^ 6;
dde7e6d1
AK		 4131 break;
4132 case 0x26: /* ES override */
4133 case 0x2e: /* CS override */
4134 case 0x36: /* SS override */
4135 case 0x3e: /* DS override */
9dac77fa 4136 set_seg_override(ctxt, (ctxt->b >> 3) & 3);
dde7e6d1
AK		 4137 break;
4138 case 0x64: /* FS override */
4139 case 0x65: /* GS override */
9dac77fa 4140 set_seg_override(ctxt, ctxt->b & 7);
dde7e6d1
AK		 4141 break;
4142 case 0x40 ... 0x4f: /* REX */
4143 if (mode != X86EMUL_MODE_PROT64)
4144 goto done_prefixes;
9dac77fa 4145 ctxt->rex_prefix = ctxt->b;
dde7e6d1
AK		 4146 continue;
4147 case 0xf0: /* LOCK */
9dac77fa 4148 ctxt->lock_prefix = 1;
dde7e6d1
AK		 4149 break;
4150 case 0xf2: /* REPNE/REPNZ */
dde7e6d1 4151 case 0xf3: /* REP/REPE/REPZ */
9dac77fa 4152 ctxt->rep_prefix = ctxt->b;
dde7e6d1
AK		 4153 break;
4154 default:
4155 goto done_prefixes;
4156 }
4157
4158 /* Any legacy prefix after a REX prefix nullifies its effect. */
4159
9dac77fa 4160 ctxt->rex_prefix = 0;
dde7e6d1
AK		 4161 }
4162
4163done_prefixes:
4164
4165 /* REX prefix. */
9dac77fa
AK		 4166 if (ctxt->rex_prefix & 8)
4167 ctxt->op_bytes = 8; /* REX.W */
dde7e6d1
AK		 4168
4169 /* Opcode byte(s). */
9dac77fa 4170 opcode = opcode_table[ctxt->b];
d3ad6243 4171 /* Two-byte opcode? */
9dac77fa
AK		 4172 if (ctxt->b == 0x0f) {
4173 ctxt->twobyte = 1;
e85a1085 4174 ctxt->b = insn_fetch(u8, ctxt);
9dac77fa 4175 opcode = twobyte_table[ctxt->b];
dde7e6d1 4176 }
9dac77fa 4177 ctxt->d = opcode.flags;
dde7e6d1 4178
9f4260e7
TY		 4179 if (ctxt->d & ModRM)
4180 ctxt->modrm = insn_fetch(u8, ctxt);
4181
9dac77fa
AK		 4182 while (ctxt->d & GroupMask) {
4183 switch (ctxt->d & GroupMask) {
46561646 4184 case Group:
9dac77fa 4185 goffset = (ctxt->modrm >> 3) & 7;
46561646
AK		 4186 opcode = opcode.u.group[goffset];
4187 break;
4188 case GroupDual:
9dac77fa
AK		 4189 goffset = (ctxt->modrm >> 3) & 7;
4190 if ((ctxt->modrm >> 6) == 3)
46561646
AK		 4191 opcode = opcode.u.gdual->mod3[goffset];
4192 else
4193 opcode = opcode.u.gdual->mod012[goffset];
4194 break;
4195 case RMExt:
9dac77fa 4196 goffset = ctxt->modrm & 7;
01de8b09 4197 opcode = opcode.u.group[goffset];
46561646
AK		 4198 break;
4199 case Prefix:
9dac77fa 4200 if (ctxt->rep_prefix && op_prefix)
1d2887e2 4201 return EMULATION_FAILED;
9dac77fa 4202 simd_prefix = op_prefix ? 0x66 : ctxt->rep_prefix;
46561646
AK		 4203 switch (simd_prefix) {
4204 case 0x00: opcode = opcode.u.gprefix->pfx_no; break;
4205 case 0x66: opcode = opcode.u.gprefix->pfx_66; break;
4206 case 0xf2: opcode = opcode.u.gprefix->pfx_f2; break;
4207 case 0xf3: opcode = opcode.u.gprefix->pfx_f3; break;
4208 }
4209 break;
4210 default:
1d2887e2 4211 return EMULATION_FAILED;
0d7cdee8 4212 }
46561646 4213
b1ea50b2 4214 ctxt->d &= ~(u64)GroupMask;
9dac77fa 4215 ctxt->d |= opcode.flags;
0d7cdee8
AK		 4216 }
4217
9dac77fa
AK		 4218 ctxt->execute = opcode.u.execute;
4219 ctxt->check_perm = opcode.check_perm;
4220 ctxt->intercept = opcode.intercept;
dde7e6d1
AK		 4221
4222 /* Unrecognised? */
9dac77fa 4223 if (ctxt->d == 0 || (ctxt->d & Undefined))
1d2887e2 4224 return EMULATION_FAILED;
dde7e6d1 4225
9dac77fa 4226 if (!(ctxt->d & VendorSpecific) && ctxt->only_vendor_specific_insn)
1d2887e2 4227 return EMULATION_FAILED;
d867162c 4228
9dac77fa
AK		 4229 if (mode == X86EMUL_MODE_PROT64 && (ctxt->d & Stack))
4230 ctxt->op_bytes = 8;
dde7e6d1 4231
9dac77fa 4232 if (ctxt->d & Op3264) {
7f9b4b75 4233 if (mode == X86EMUL_MODE_PROT64)
9dac77fa 4234 ctxt->op_bytes = 8;
7f9b4b75 4235 else
9dac77fa 4236 ctxt->op_bytes = 4;
7f9b4b75
AK		 4237 }
4238
9dac77fa
AK		 4239 if (ctxt->d & Sse)
4240 ctxt->op_bytes = 16;
cbe2c9d3
AK		 4241 else if (ctxt->d & Mmx)
4242 ctxt->op_bytes = 8;
1253791d 4243
dde7e6d1 4244 /* ModRM and SIB bytes. */
9dac77fa 4245 if (ctxt->d & ModRM) {
f09ed83e 4246 rc = decode_modrm(ctxt, &ctxt->memop);
9dac77fa
AK		 4247 if (!ctxt->has_seg_override)
4248 set_seg_override(ctxt, ctxt->modrm_seg);
4249 } else if (ctxt->d & MemAbs)
f09ed83e 4250 rc = decode_abs(ctxt, &ctxt->memop);
dde7e6d1
AK		 4251 if (rc != X86EMUL_CONTINUE)
4252 goto done;
4253
9dac77fa
AK		 4254 if (!ctxt->has_seg_override)
4255 set_seg_override(ctxt, VCPU_SREG_DS);
dde7e6d1 4256
f09ed83e 4257 ctxt->memop.addr.mem.seg = seg_override(ctxt);
dde7e6d1 4258
f09ed83e
AK		 4259 if (ctxt->memop.type == OP_MEM && ctxt->ad_bytes != 8)
4260 ctxt->memop.addr.mem.ea = (u32)ctxt->memop.addr.mem.ea;
dde7e6d1 4261
dde7e6d1
AK		 4262 /*
4263 * Decode and fetch the source operand: register, memory
4264 * or immediate.
4265 */
0fe59128 4266 rc = decode_operand(ctxt, &ctxt->src, (ctxt->d >> SrcShift) & OpMask);
39f21ee5
AK		 4267 if (rc != X86EMUL_CONTINUE)
4268 goto done;
4269
dde7e6d1
AK		 4270 /*
4271 * Decode and fetch the second source operand: register, memory
4272 * or immediate.
4273 */
4dd6a57d 4274 rc = decode_operand(ctxt, &ctxt->src2, (ctxt->d >> Src2Shift) & OpMask);
39f21ee5
AK		 4275 if (rc != X86EMUL_CONTINUE)
4276 goto done;
4277
dde7e6d1 4278 /* Decode and fetch the destination operand: register or memory. */
a9945549 4279 rc = decode_operand(ctxt, &ctxt->dst, (ctxt->d >> DstShift) & OpMask);
dde7e6d1
AK		 4280
4281done:
f09ed83e
AK		 4282 if (ctxt->memopp && ctxt->memopp->type == OP_MEM && ctxt->rip_relative)
4283 ctxt->memopp->addr.mem.ea += ctxt->_eip;
cb16c348 4284
1d2887e2 4285 return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK;
dde7e6d1
AK		 4286}
4287
1cb3f3ae
XG		 4288bool x86_page_table_writing_insn(struct x86_emulate_ctxt *ctxt)
4289{
4290 return ctxt->d & PageTable;
4291}
4292
3e2f65d5
GN		 4293static bool string_insn_completed(struct x86_emulate_ctxt *ctxt)
4294{
3e2f65d5
GN		 4295 /* The second termination condition only applies for REPE
4296 * and REPNE. Test if the repeat string operation prefix is
4297 * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
4298 * corresponding termination condition according to:
4299 * - if REPE/REPZ and ZF = 0 then done
4300 * - if REPNE/REPNZ and ZF = 1 then done
4301 */
9dac77fa
AK		 4302 if (((ctxt->b == 0xa6) || (ctxt->b == 0xa7) ||
4303 (ctxt->b == 0xae) || (ctxt->b == 0xaf))
4304 && (((ctxt->rep_prefix == REPE_PREFIX) &&
3e2f65d5 4305 ((ctxt->eflags & EFLG_ZF) == 0))
9dac77fa 4306 || ((ctxt->rep_prefix == REPNE_PREFIX) &&
3e2f65d5
GN		 4307 ((ctxt->eflags & EFLG_ZF) == EFLG_ZF))))
4308 return true;
4309
4310 return false;
4311}
4312
cbe2c9d3
AK		 4313static int flush_pending_x87_faults(struct x86_emulate_ctxt *ctxt)
4314{
4315 bool fault = false;
4316
4317 ctxt->ops->get_fpu(ctxt);
4318 asm volatile("1: fwait \n\t"
4319 "2: \n\t"
4320 ".pushsection .fixup,\"ax\" \n\t"
4321 "3: \n\t"
4322 "movb $1, %[fault] \n\t"
4323 "jmp 2b \n\t"
4324 ".popsection \n\t"
4325 _ASM_EXTABLE(1b, 3b)
38e8a2dd 4326 : [fault]"+qm"(fault));
cbe2c9d3
AK		 4327 ctxt->ops->put_fpu(ctxt);
4328
4329 if (unlikely(fault))
4330 return emulate_exception(ctxt, MF_VECTOR, 0, false);
4331
4332 return X86EMUL_CONTINUE;
4333}
4334
4335static void fetch_possible_mmx_operand(struct x86_emulate_ctxt *ctxt,
4336 struct operand *op)
4337{
4338 if (op->type == OP_MM)
4339 read_mmx_reg(ctxt, &op->mm_val, op->addr.mm);
4340}
4341
dd856efa 4342
7b105ca2 4343int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
8b4caf66 4344{
9aabc88f 4345 struct x86_emulate_ops *ops = ctxt->ops;
1b30eaa8 4346 int rc = X86EMUL_CONTINUE;
9dac77fa 4347 int saved_dst_type = ctxt->dst.type;
8b4caf66 4348
9dac77fa 4349 ctxt->mem_read.pos = 0;
310b5d30 4350
9dac77fa 4351 if (ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) {
35d3d4a1 4352 rc = emulate_ud(ctxt);
1161624f
GN		 4353 goto done;
4354 }
4355
d380a5e4 4356 /* LOCK prefix is allowed only with some instructions */
9dac77fa 4357 if (ctxt->lock_prefix && (!(ctxt->d & Lock) || ctxt->dst.type != OP_MEM)) {
35d3d4a1 4358 rc = emulate_ud(ctxt);
d380a5e4
GN		 4359 goto done;
4360 }
4361
9dac77fa 4362 if ((ctxt->d & SrcMask) == SrcMemFAddr && ctxt->src.type != OP_MEM) {
35d3d4a1 4363 rc = emulate_ud(ctxt);
081bca0e
AK		 4364 goto done;
4365 }
4366
cbe2c9d3
AK		 4367 if (((ctxt->d & (Sse|Mmx)) && ((ops->get_cr(ctxt, 0) & X86_CR0_EM)))
4368 || ((ctxt->d & Sse) && !(ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR))) {
1253791d
AK		 4369 rc = emulate_ud(ctxt);
4370 goto done;
4371 }
4372
cbe2c9d3 4373 if ((ctxt->d & (Sse|Mmx)) && (ops->get_cr(ctxt, 0) & X86_CR0_TS)) {
1253791d
AK		 4374 rc = emulate_nm(ctxt);
4375 goto done;
4376 }
4377
cbe2c9d3
AK		 4378 if (ctxt->d & Mmx) {
4379 rc = flush_pending_x87_faults(ctxt);
4380 if (rc != X86EMUL_CONTINUE)
4381 goto done;
4382 /*
4383 * Now that we know the fpu is exception safe, we can fetch
4384 * operands from it.
4385 */
4386 fetch_possible_mmx_operand(ctxt, &ctxt->src);
4387 fetch_possible_mmx_operand(ctxt, &ctxt->src2);
4388 if (!(ctxt->d & Mov))
4389 fetch_possible_mmx_operand(ctxt, &ctxt->dst);
4390 }
4391
9dac77fa
AK		 4392 if (unlikely(ctxt->guest_mode) && ctxt->intercept) {
4393 rc = emulator_check_intercept(ctxt, ctxt->intercept,
8a76d7f2 4394 X86_ICPT_PRE_EXCEPT);
c4f035c6
AK		 4395 if (rc != X86EMUL_CONTINUE)
4396 goto done;
4397 }
4398
e92805ac 4399 /* Privileged instruction can be executed only in CPL=0 */
9dac77fa 4400 if ((ctxt->d & Priv) && ops->cpl(ctxt)) {
35d3d4a1 4401 rc = emulate_gp(ctxt, 0);
e92805ac
GN		 4402 goto done;
4403 }
4404
8ea7d6ae 4405 /* Instruction can only be executed in protected mode */
9dac77fa 4406 if ((ctxt->d & Prot) && !(ctxt->mode & X86EMUL_MODE_PROT)) {
8ea7d6ae
JR		 4407 rc = emulate_ud(ctxt);
4408 goto done;
4409 }
4410
d09beabd 4411 /* Do instruction specific permission checks */
9dac77fa
AK		 4412 if (ctxt->check_perm) {
4413 rc = ctxt->check_perm(ctxt);
d09beabd
JR		 4414 if (rc != X86EMUL_CONTINUE)
4415 goto done;
4416 }
4417
9dac77fa
AK		 4418 if (unlikely(ctxt->guest_mode) && ctxt->intercept) {
4419 rc = emulator_check_intercept(ctxt, ctxt->intercept,
8a76d7f2 4420 X86_ICPT_POST_EXCEPT);
c4f035c6
AK		 4421 if (rc != X86EMUL_CONTINUE)
4422 goto done;
4423 }
4424
9dac77fa 4425 if (ctxt->rep_prefix && (ctxt->d & String)) {
b9fa9d6b 4426 /* All REP prefixes have the same first termination condition */
dd856efa 4427 if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) {
9dac77fa 4428 ctxt->eip = ctxt->_eip;
b9fa9d6b
AK		 4429 goto done;
4430 }
b9fa9d6b
AK		 4431 }
4432
9dac77fa
AK		 4433 if ((ctxt->src.type == OP_MEM) && !(ctxt->d & NoAccess)) {
4434 rc = segmented_read(ctxt, ctxt->src.addr.mem,
4435 ctxt->src.valptr, ctxt->src.bytes);
b60d513c 4436 if (rc != X86EMUL_CONTINUE)
8b4caf66 4437 goto done;
9dac77fa 4438 ctxt->src.orig_val64 = ctxt->src.val64;
8b4caf66
LV		 4439 }
4440
9dac77fa
AK		 4441 if (ctxt->src2.type == OP_MEM) {
4442 rc = segmented_read(ctxt, ctxt->src2.addr.mem,
4443 &ctxt->src2.val, ctxt->src2.bytes);
e35b7b9c
GN		 4444 if (rc != X86EMUL_CONTINUE)
4445 goto done;
4446 }
4447
9dac77fa 4448 if ((ctxt->d & DstMask) == ImplicitOps)
8b4caf66
LV		 4449 goto special_insn;
4450
4451
9dac77fa 4452 if ((ctxt->dst.type == OP_MEM) && !(ctxt->d & Mov)) {
69f55cb1 4453 /* optimisation - avoid slow emulated read if Mov */
9dac77fa
AK		 4454 rc = segmented_read(ctxt, ctxt->dst.addr.mem,
4455 &ctxt->dst.val, ctxt->dst.bytes);
69f55cb1
GN		 4456 if (rc != X86EMUL_CONTINUE)
4457 goto done;
038e51de 4458 }
9dac77fa 4459 ctxt->dst.orig_val = ctxt->dst.val;
038e51de 4460
018a98db
AK		 4461special_insn:
4462
9dac77fa
AK		 4463 if (unlikely(ctxt->guest_mode) && ctxt->intercept) {
4464 rc = emulator_check_intercept(ctxt, ctxt->intercept,
8a76d7f2 4465 X86_ICPT_POST_MEMACCESS);
c4f035c6
AK		 4466 if (rc != X86EMUL_CONTINUE)
4467 goto done;
4468 }
4469
9dac77fa
AK		 4470 if (ctxt->execute) {
4471 rc = ctxt->execute(ctxt);
ef65c889
AK		 4472 if (rc != X86EMUL_CONTINUE)
4473 goto done;
4474 goto writeback;
4475 }
4476
9dac77fa 4477 if (ctxt->twobyte)
6aa8b732
AK		 4478 goto twobyte_insn;
4479
9dac77fa 4480 switch (ctxt->b) {
33615aa9 4481 case 0x40 ... 0x47: /* inc r16/r32 */
d1eef45d 4482 emulate_1op(ctxt, "inc");
33615aa9
AK		 4483 break;
4484 case 0x48 ... 0x4f: /* dec r16/r32 */
d1eef45d 4485 emulate_1op(ctxt, "dec");
33615aa9 4486 break;
6aa8b732 4487 case 0x63: /* movsxd */
8b4caf66 4488 if (ctxt->mode != X86EMUL_MODE_PROT64)
6aa8b732 4489 goto cannot_emulate;
9dac77fa 4490 ctxt->dst.val = (s32) ctxt->src.val;
6aa8b732 4491 break;
b2833e3c 4492 case 0x70 ... 0x7f: /* jcc (short) */
9dac77fa
AK		 4493 if (test_cc(ctxt->b, ctxt->eflags))
4494 jmp_rel(ctxt, ctxt->src.val);
018a98db 4495 break;
7e0b54b1 4496 case 0x8d: /* lea r16/r32, m */
9dac77fa 4497 ctxt->dst.val = ctxt->src.addr.mem.ea;
7e0b54b1 4498 break;
3d9e77df 4499 case 0x90 ... 0x97: /* nop / xchg reg, rax */
dd856efa 4500 if (ctxt->dst.addr.reg == reg_rmw(ctxt, VCPU_REGS_RAX))
34698d8c 4501 break;
e4f973ae
TY		 4502 rc = em_xchg(ctxt);
4503 break;
e8b6fa70 4504 case 0x98: /* cbw/cwde/cdqe */
9dac77fa
AK		 4505 switch (ctxt->op_bytes) {
4506 case 2: ctxt->dst.val = (s8)ctxt->dst.val; break;
4507 case 4: ctxt->dst.val = (s16)ctxt->dst.val; break;
4508 case 8: ctxt->dst.val = (s32)ctxt->dst.val; break;
e8b6fa70
WY		 4509 }
4510 break;
018a98db 4511 case 0xc0 ... 0xc1:
51187683 4512 rc = em_grp2(ctxt);
018a98db 4513 break;
6e154e56 4514 case 0xcc: /* int3 */
5c5df76b
TY		 4515 rc = emulate_int(ctxt, 3);
4516 break;
6e154e56 4517 case 0xcd: /* int n */
9dac77fa 4518 rc = emulate_int(ctxt, ctxt->src.val);
6e154e56
MG		 4519 break;
4520 case 0xce: /* into */
5c5df76b
TY		 4521 if (ctxt->eflags & EFLG_OF)
4522 rc = emulate_int(ctxt, 4);
6e154e56 4523 break;
018a98db 4524 case 0xd0 ... 0xd1: /* Grp2 */
51187683 4525 rc = em_grp2(ctxt);
018a98db
AK		 4526 break;
4527 case 0xd2 ... 0xd3: /* Grp2 */
dd856efa 4528 ctxt->src.val = reg_read(ctxt, VCPU_REGS_RCX);
51187683 4529 rc = em_grp2(ctxt);
018a98db 4530 break;
1a52e051 4531 case 0xe9: /* jmp rel */
db5b0762 4532 case 0xeb: /* jmp rel short */
9dac77fa
AK		 4533 jmp_rel(ctxt, ctxt->src.val);
4534 ctxt->dst.type = OP_NONE; /* Disable writeback. */
1a52e051 4535 break;
111de5d6 4536 case 0xf4: /* hlt */
6c3287f7 4537 ctxt->ops->halt(ctxt);
19fdfa0d 4538 break;
111de5d6
AK		 4539 case 0xf5: /* cmc */
4540 /* complement carry flag from eflags reg */
4541 ctxt->eflags ^= EFLG_CF;
111de5d6
AK		 4542 break;
4543 case 0xf8: /* clc */
4544 ctxt->eflags &= ~EFLG_CF;
111de5d6 4545 break;
8744aa9a
MG		 4546 case 0xf9: /* stc */
4547 ctxt->eflags |= EFLG_CF;
4548 break;
fb4616f4
MG		 4549 case 0xfc: /* cld */
4550 ctxt->eflags &= ~EFLG_DF;
fb4616f4
MG		 4551 break;
4552 case 0xfd: /* std */
4553 ctxt->eflags |= EFLG_DF;
fb4616f4 4554 break;
91269b8f
AK		 4555 default:
4556 goto cannot_emulate;
6aa8b732 4557 }
018a98db 4558
7d9ddaed
AK		 4559 if (rc != X86EMUL_CONTINUE)
4560 goto done;
4561
018a98db 4562writeback:
adddcecf 4563 rc = writeback(ctxt);
1b30eaa8 4564 if (rc != X86EMUL_CONTINUE)
018a98db
AK		 4565 goto done;
4566
5cd21917
GN		 4567 /*
4568 * restore dst type in case the decoding will be reused
4569 * (happens for string instruction )
4570 */
9dac77fa 4571 ctxt->dst.type = saved_dst_type;
5cd21917 4572
9dac77fa
AK		 4573 if ((ctxt->d & SrcMask) == SrcSI)
4574 string_addr_inc(ctxt, seg_override(ctxt),
4575 VCPU_REGS_RSI, &ctxt->src);
a682e354 4576
9dac77fa 4577 if ((ctxt->d & DstMask) == DstDI)
90de84f5 4578 string_addr_inc(ctxt, VCPU_SREG_ES, VCPU_REGS_RDI,
9dac77fa 4579 &ctxt->dst);
d9271123 4580
9dac77fa
AK		 4581 if (ctxt->rep_prefix && (ctxt->d & String)) {
4582 struct read_cache *r = &ctxt->io_read;
dd856efa 4583 register_address_increment(ctxt, reg_rmw(ctxt, VCPU_REGS_RCX), -1);
3e2f65d5 4584
d2ddd1c4
GN		 4585 if (!string_insn_completed(ctxt)) {
4586 /*
4587 * Re-enter guest when pio read ahead buffer is empty
4588 * or, if it is not used, after each 1024 iteration.
4589 */
dd856efa 4590 if ((r->end != 0 || reg_read(ctxt, VCPU_REGS_RCX) & 0x3ff) &&
d2ddd1c4
GN		 4591 (r->end == 0 || r->end != r->pos)) {
4592 /*
4593 * Reset read cache. Usually happens before
4594 * decode, but since instruction is restarted
4595 * we have to do it here.
4596 */
9dac77fa 4597 ctxt->mem_read.end = 0;
dd856efa 4598 writeback_registers(ctxt);
d2ddd1c4
GN		 4599 return EMULATION_RESTART;
4600 }
4601 goto done; /* skip rip writeback */
0fa6ccbd 4602 }
5cd21917 4603 }
d2ddd1c4 4604
9dac77fa 4605 ctxt->eip = ctxt->_eip;
018a98db
AK		 4606
4607done:
da9cb575
AK		 4608 if (rc == X86EMUL_PROPAGATE_FAULT)
4609 ctxt->have_exception = true;
775fde86
JR		 4610 if (rc == X86EMUL_INTERCEPTED)
4611 return EMULATION_INTERCEPTED;
4612
dd856efa
AK		 4613 if (rc == X86EMUL_CONTINUE)
4614 writeback_registers(ctxt);
4615
d2ddd1c4 4616 return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
6aa8b732
AK		 4617
4618twobyte_insn:
9dac77fa 4619 switch (ctxt->b) {
018a98db 4620 case 0x09: /* wbinvd */
cfb22375 4621 (ctxt->ops->wbinvd)(ctxt);
f5f48ee1
SY		 4622 break;
4623 case 0x08: /* invd */
018a98db
AK		 4624 case 0x0d: /* GrpP (prefetch) */
4625 case 0x18: /* Grp16 (prefetch/nop) */
018a98db
AK		 4626 break;
4627 case 0x20: /* mov cr, reg */
9dac77fa 4628 ctxt->dst.val = ops->get_cr(ctxt, ctxt->modrm_reg);
018a98db 4629 break;
6aa8b732 4630 case 0x21: /* mov from dr to reg */
9dac77fa 4631 ops->get_dr(ctxt, ctxt->modrm_reg, &ctxt->dst.val);
6aa8b732 4632 break;
6aa8b732 4633 case 0x40 ... 0x4f: /* cmov */
9dac77fa
AK		 4634 ctxt->dst.val = ctxt->dst.orig_val = ctxt->src.val;
4635 if (!test_cc(ctxt->b, ctxt->eflags))
4636 ctxt->dst.type = OP_NONE; /* no writeback */
6aa8b732 4637 break;
b2833e3c 4638 case 0x80 ... 0x8f: /* jnz rel, etc*/
9dac77fa
AK		 4639 if (test_cc(ctxt->b, ctxt->eflags))
4640 jmp_rel(ctxt, ctxt->src.val);
018a98db 4641 break;
ee45b58e 4642 case 0x90 ... 0x9f: /* setcc r/m8 */
9dac77fa 4643 ctxt->dst.val = test_cc(ctxt->b, ctxt->eflags);
ee45b58e 4644 break;
9bf8ea42
GT		 4645 case 0xa4: /* shld imm8, r, r/m */
4646 case 0xa5: /* shld cl, r, r/m */
761441b9 4647 emulate_2op_cl(ctxt, "shld");
9bf8ea42 4648 break;
9bf8ea42
GT		 4649 case 0xac: /* shrd imm8, r, r/m */
4650 case 0xad: /* shrd cl, r, r/m */
761441b9 4651 emulate_2op_cl(ctxt, "shrd");
9bf8ea42 4652 break;
2a7c5b8b
GC		 4653 case 0xae: /* clflush */
4654 break;
6aa8b732 4655 case 0xb6 ... 0xb7: /* movzx */
9dac77fa 4656 ctxt->dst.bytes = ctxt->op_bytes;
361cad2b 4657 ctxt->dst.val = (ctxt->src.bytes == 1) ? (u8) ctxt->src.val
9dac77fa 4658 : (u16) ctxt->src.val;
6aa8b732 4659 break;
6aa8b732 4660 case 0xbe ... 0xbf: /* movsx */
9dac77fa 4661 ctxt->dst.bytes = ctxt->op_bytes;
361cad2b 4662 ctxt->dst.val = (ctxt->src.bytes == 1) ? (s8) ctxt->src.val :
9dac77fa 4663 (s16) ctxt->src.val;
6aa8b732 4664 break;
92f738a5 4665 case 0xc0 ... 0xc1: /* xadd */
a31b9cea 4666 emulate_2op_SrcV(ctxt, "add");
92f738a5 4667 /* Write back the register source. */
9dac77fa
AK		 4668 ctxt->src.val = ctxt->dst.orig_val;
4669 write_register_operand(&ctxt->src);
92f738a5 4670 break;
a012e65a 4671 case 0xc3: /* movnti */
9dac77fa
AK		 4672 ctxt->dst.bytes = ctxt->op_bytes;
4673 ctxt->dst.val = (ctxt->op_bytes == 4) ? (u32) ctxt->src.val :
4674 (u64) ctxt->src.val;
a012e65a 4675 break;
91269b8f
AK		 4676 default:
4677 goto cannot_emulate;
6aa8b732 4678 }
7d9ddaed
AK		 4679
4680 if (rc != X86EMUL_CONTINUE)
4681 goto done;
4682
6aa8b732
AK		 4683 goto writeback;
4684
4685cannot_emulate:
a0c0ab2f 4686 return EMULATION_FAILED;
6aa8b732 4687}
dd856efa
AK		 4688
4689void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt)
4690{
4691 invalidate_registers(ctxt);
4692}
4693
4694void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt)
4695{
4696 writeback_registers(ctxt);
4697}
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